JPH087318A - Optical recording / reproducing device - Google Patents

Abstract

(57) [Summary] [Purpose] Optical information recording media (optical discs) with different substrate thickness.
Even with respect to, the signal can be recorded / reproduced with one optical head,
Moreover, it is an object of the present invention to provide a compact and inexpensive optical recording / reproducing device. A light flux changing member 40 (50, 6) provided in an optical path from a semiconductor laser 1 to an objective lens 5 in an optical head 10.
0, 70, 80) according to the difference in the base material thickness of the optical information recording medium 100, and the insertion / removal operation is performed by moving the optical head 10 to a specific position.
Alternatively, by performing a special shape provided on the optical information recording medium support 140, the optical information recording medium having a different base material thickness is recorded or reproduced with a small amount of aberration by one optical head.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording / reproducing apparatus for optically recording and / or reproducing a signal on an optical information recording medium (optical disc).

[0002]

2. Description of the Related Art FIG. 8 shows a schematic structure of an optical head of a general optical recording / reproducing apparatus using a semiconductor laser. In FIG. 8, the divergent light emitted from the semiconductor laser 201 is converted into an elliptical substantially parallel light flux by the condenser lens 202 and converted into a perfect circular light flux by the shaping surface 203 a of the beam splitter 203, and then the rising mirror 204. Is reflected by and goes toward the objective lens 205. The light flux passing through the objective lens 205 is focused on the recording surface of the optical information recording medium 200 to form a light spot 201a.

In the case of reproduction, the light beam reflected by the optical information recording medium 200 passes through the objective lens 205 again, is reflected by the rising mirror 204, enters the beam splitter 203, is reflected by the reflecting surface 203b, and is reflected by the diaphragm lens 206. After passing through and being reflected by the reflection mirror 207, the photodetector 208
At the same time, the reproduction signal is detected and the control signal for controlling the position of the light spot 201a is also detected.

An optical head 210 is constituted by these optical system parts and an optical head housing 209 for fixing them. While performing such an operation in the optical head 210, the optical information recording medium 200 is rotated, and at the same time, the optical head 210 is moved in the direction of arrow a or b to perform the information recording / reproducing operation.

Here, these optical system parts including the objective lens 205 are designed so that the light spot 201a is exactly formed on the recording surface of the optical information recording medium 200 having a constant base material thickness. Therefore, according to the optical component having such a design, the optical spot 201a is not exactly formed on the recording surface with respect to the optical information recording medium having a substrate thickness different from the above-mentioned constant substrate thickness. Therefore, spherical aberration occurs on the recording surface and the image forming performance of the light spot 201a deteriorates, making it difficult to record and reproduce information.

[0006]

Conventionally, the substrate thickness of optical information recording media used in compact discs (CDs), video discs, magneto-optical disc devices for data, etc., are all the same (1.2 mm). )Met. Therefore, it was possible to record / reproduce different optical information recording media with one optical head. However, in recent years, in order to achieve higher image quality, attempts have been made to use an optical information recording medium having a base material thinner (0.6 mm) than before.

In order to perform recording / reproducing with an optical spot on such an optical information recording medium having a thin base material, an optical head incorporating a dedicated optical system component is required, and optical information recording having a different base material thickness is required. In order to maintain compatibility as a device with respect to the medium, recording / reproducing must be performed by separate optical heads.
For this reason, it becomes necessary to mount two optical heads in the apparatus, which leads to an increase in the size and cost of the apparatus.

Therefore, the present invention has been made in view of the above problems.
With respect to the difference in the base material thickness of the optical information recording medium, by using the moving system of the optical head or the moving operation of the transfer system support, the conversion lens or the aperture plate is inserted into and removed from the optical path of the optical head. Compact, capable of obtaining high-quality recording / reproducing signals even for optical information recording media having different substrate thicknesses
An inexpensive optical recording / reproducing device is provided.

[0009]

In order to solve the above-mentioned problems, an optical recording / reproducing apparatus according to a first aspect of the present invention records optical information emitted from a semiconductor laser through a beam splitter and an objective lens. An optical head that collects light on a medium, reflects the reflected light in a direction different from the incident light from the semiconductor laser by a beam splitter, and causes a photodetector to receive the light through a diaphragm lens; and a semiconductor laser in the optical head. A light flux changing member provided so as to be insertable into and removable from the optical path to the objective lens, an optical head transfer means for transferring the optical head on the surface of the optical information recording medium, and provided on a transfer path of the optical head. Optical information in which the protruding portion and the optical information recording medium are housed or placed, and the portion of the optical head facing the objective lens is open over the range in which the optical head moves. A recording medium support and a detection means for detecting a difference in substrate thickness of the optical information recording medium or a type of the optical information recording medium are provided, and the optical head is moved to a specific position based on a detection signal from the detection means. It is characterized in that the light flux changing member is moved and the light flux changing member is inserted / removed by the protrusion on the transfer path.

An optical recording / reproducing apparatus according to a second aspect of the present invention is the optical recording / reproducing apparatus according to the first aspect, wherein the protrusions are provided at both ends of the optical head in the transfer direction.
The light flux changing member is pushed in one insertion direction by the transfer of the optical head in one transfer direction, and in the removal direction by the other projection by the transfer of the optical head in the other transfer direction, and is pressed by a predetermined amount or more. It is characterized in that the movement is restricted to the insertion or removal position by the action of the urging means when it is pushed.

According to a third aspect of the present invention, there is provided an optical recording / reproducing apparatus in which light emitted from a semiconductor laser is focused on an optical information recording medium through a beam splitter and an objective lens, and reflected light is reflected by the beam splitter. Is provided so that it can be inserted into and removed from the optical head that reflects in a direction different from the incident light from the optical head and causes the photodetector to receive the light through the aperture lens, and the optical path from the semiconductor laser in the optical head to the objective lens. A light flux changing member, a driving means for driving the light flux changing member, an optical head moving means for moving the optical head on the surface of the optical information recording medium, and a housing or placing the optical information recording medium, An optical information recording medium support body in which a portion of the optical head facing the objective lens is opened over a range in which the optical head is transported, and a base material thickness or light of the optical information recording medium. And detecting means for detecting a difference in the type of broadcast recording medium, said drive means based on a detection signal from said detecting means is characterized by performing the insertion withdrawal operation of the light flux changing member.

An optical recording / reproducing apparatus according to a fourth aspect of the present invention is the optical recording / reproducing apparatus according to the third aspect, wherein the protrusion is provided at one end of the optical head in the transfer direction, and the light flux changing member is inserted by a biasing means. The light flux changing member is urged in one of a position and a detaching position, and the light flux changing member is moved in one of the moving directions of the optical head so that the protruding portion moves in the other direction of the inserting position or the detaching position. It is characterized in that it is moved against the biasing means, and is selectively held by the driving means at its moving position in response to the detection output of the detecting means.

An optical recording / reproducing apparatus according to a fifth aspect of the present invention is the optical recording / reproducing apparatus according to the third aspect, wherein the luminous flux changing member is urged by an urging means toward either the insertion position or the withdrawal position, and the detecting means. In response to the detection output of, the drive means is moved to either the insertion position or the removal position in the other direction.

An optical recording / reproducing apparatus according to a sixth aspect of the present invention is the optical recording / reproducing apparatus according to any one of the first to fifth aspects, wherein the detecting means is a substrate thickness or a type of the optical information recording medium on the optical information recording medium support. It is characterized by having markings provided according to the difference, a sensor for reading the markings, and a discriminating circuit for discriminating the substrate thickness of the optical information recording medium upon receiving a detection signal from the sensor.

According to a seventh aspect of the present invention, there is provided an optical recording / reproducing apparatus in which light emitted from a semiconductor laser is condensed on an optical information recording medium via a beam splitter and an objective lens, and reflected light is emitted from the semiconductor laser by the beam splitter. Is provided so that it can be inserted into and removed from the optical head that reflects in a direction different from the incident light from the optical head and causes the photodetector to receive the light through the aperture lens, and the optical path from the semiconductor laser in the optical head to the objective lens. A light flux changing member, an optical head moving means for moving the optical head on the surface of the optical information recording medium, and a portion for accommodating or mounting the optical information recording medium and facing the objective lens of the optical head. An optical information recording medium support having an opening over the range in which the optical head is transported and having a different shape depending on the thickness or type of the base material. Respective shapes and said light flux changing member on the optical head interferes media support or by not interfering, is characterized in that to perform the operation of inserting separation of the light flux changing member.

An optical recording / reproducing apparatus according to an eighth aspect of the present invention is the optical recording / reproducing apparatus according to the seventh aspect, wherein the optical information recording medium support is
The light flux changing member selectively has a protrusion extending in the transport direction of the optical head according to the difference in substrate thickness or type, and the light flux changing member has a bent portion bent in the direction of the protrusion. It is characterized in that the light flux changing member is inserted / removed by interfering with or not interfering with the bent portion.

According to a ninth aspect of the present invention, there is provided an optical recording / reproducing apparatus in which light emitted from a semiconductor laser is condensed on an optical information recording medium via a beam splitter and an objective lens, and reflected light is emitted from the semiconductor laser by the beam splitter. Is provided so that it can be inserted into and removed from the optical head that reflects in a direction different from the incident light from the optical head and causes the photodetector to receive the light through the aperture lens, and the optical path from the semiconductor laser in the optical head to the objective lens. A light flux changing member, an optical head transfer means for transferring the optical head on the surface of the optical information recording medium, a transfer system support for moving the optical head and the optical head transfer means, and the optical information. A recording medium is stored or placed, and a portion of the optical head facing the objective lens is opened over a range in which the optical head is transferred,
An optical information recording medium support installed at a predetermined position according to a difference in thickness or type of the optical information recording medium, and a base material of the optical information recording medium from the installation position of the optical information recording medium support. And a detection means for detecting a difference in thickness or type, wherein the transfer system support is moved to a position where the optical head can perform a recording / reproducing operation on the optical information recording medium with respect to each installation position. At the time of this movement, the operation of inserting and removing the light flux changing member is performed by a protrusion or the like on the movement path.

An optical recording / reproducing apparatus according to a tenth aspect of the present invention is characterized in that, in the first to ninth aspects, the light flux changing member has an aperture plate for changing a diameter of the light flux.

An optical recording / reproducing apparatus according to an eleventh aspect of the present invention is characterized in that, in the first to ninth aspects, the light flux changing member is a conversion lens that changes a light focusing state.

[0020]

According to the optical recording / reproducing apparatus of the first aspect of the present invention, in the optical head, the light emitted from the semiconductor laser is condensed on the optical information recording medium via the beam splitter and the objective lens, The reflected light on the optical information recording medium is reflected by the beam splitter in a direction different from the incident light from the semiconductor laser, and is received by the photodetector via the diaphragm lens. Such an optical head is transferred on the surface of the optical information recording medium by the optical head transfer means. A light flux changing member is provided so that it can be inserted into and removed from the optical path from the semiconductor laser in the optical head to the objective lens.
On the other hand, the optical information recording medium is housed or placed on its support. When the detection means detects the difference in the base material thickness or the type of the optical information recording medium, the optical head is moved to a specific position based on the detection signal from the detection means. In this transfer, the light flux changing member is configured to be inserted into and removed from the optical path by the protrusion on the transfer path, so that a recording / reproducing signal for the optical information recording medium can be obtained by one optical head.

According to a first aspect of the present invention, as in the second aspect, the protrusions are provided in the gaps at both ends of the optical head in the moving direction, and the light flux changing member is moved in the one moving direction of the optical head. By pushing one protrusion in the insertion direction, and by moving the optical head in the other transporting direction by the other protrusion, pushing it in the detaching direction, and inserting it by the action of the biasing means after passing the pushing position of a certain amount or more. Or, the movement is restricted to the detachment position so that it can be surely 1
Even with one optical head, it is possible to obtain a recording / reproducing signal for an optical information recording medium having a different base material thickness or type.

According to the optical recording / reproducing apparatus of the third aspect of the present invention, in the optical head, the light emitted from the semiconductor laser is condensed on the optical information recording medium via the beam splitter and the objective lens, The reflected light on the optical information recording medium is reflected by the beam splitter in a direction different from the incident light from the semiconductor laser, and is received by the photodetector via the diaphragm lens. Such an optical head is transferred on the surface of the optical information recording medium by the optical head transfer means. A light flux changing member is provided so that it can be inserted into and removed from the optical path from the semiconductor laser in the optical head to the objective lens. On the other hand, the optical information recording medium is housed or placed on its support. When the detecting means detects the difference in the thickness of the base material of the optical information recording medium or the type thereof, the light flux changing member is inserted into or removed from the optical path by the driving means based on the detection signal from the detecting means. To / from an optical information recording medium with one optical head
The configuration is such that a reproduction signal can be obtained.

In a third aspect of the present invention, as in the fourth aspect, a protrusion is provided at one end of the optical head in the transfer direction, and the light flux changing member is urged by means of an urging means to either the insertion position or the removal position. And moving the light flux changing member in the one direction of the insertion direction or the withdrawal position of the optical head by the movement of the optical head in the one movement direction, and against the urging means. An optical information recording medium having different substrate thicknesses and types even with one optical head is ensured with a simple structure by enabling the driving means to selectively hold the moving position in response to the detection output of the detecting means. The recording / reproducing signal may be obtained.

According to a third aspect of the present invention, as in the fifth aspect, the luminous flux changing member is biased by the biasing means toward either the insertion position or the detaching position, and in response to the detection output of the detecting means, The drive means is moved to either the insertion position or the removal position in the other direction, so that a simple structure can surely generate a recording / reproducing signal for an optical information recording medium having a different base material thickness or type even with one optical head. You may make it possible to make it the structure obtained.

According to the first to fifth aspects of the present invention, as in the sixth aspect, the detection means is provided on the optical information recording medium support in accordance with the substrate thickness or the type of the optical information recording medium. It may be configured with a sensor for detecting the marking so that the detection can be performed easily and surely.

According to a seventh aspect of the present invention, there is provided an optical information recording / reproducing apparatus, wherein the optical information recording medium support has a different shape according to the base material thickness or the type of the optical information recording medium. When the shape of the support and the light flux changing member on the optical head interfere or do not interfere with each other, the operation of inserting and removing the light flux changing member is performed, so that the thickness of the base material is increased by one optical head. Recording / reproducing signals can be obtained for different optical information recording media.

According to a seventh aspect of the present invention, as in the eighth aspect, the optical information recording medium support is provided with a protrusion extending in the transport direction of the optical head according to a difference in substrate thickness or type, and the light flux changing member. A bent portion bent in the direction of the protrusion is provided on the optical head, and the interference between the protrusion and the bent portion causes the light flux changing member to be inserted / removed. However, it may be configured to obtain a recording / reproducing signal to an optical information recording medium having a different base material thickness or type.

In the optical recording / reproducing apparatus according to claim 9 of the present invention, the optical information recording support is installed at a predetermined position according to the difference in the substrate thickness or the type of the optical information recording medium, and the optical information recording support is detected by the detecting means. The difference in the substrate thickness or the type of the optical information recording medium is detected from the installation position of the information recording medium support, and the optical head can perform the recording / reproducing operation on the optical information recording medium at each of the installation positions. The transfer system support moves to the position, and at the time of this movement, the protrusions and the like on the movement path perform the insertion / removal operation of the light flux changing member. A recording / reproducing signal for the recording medium can be obtained.

In claims 1 to 9, claim 10
As described above, the light flux changing member is configured to have an aperture plate that changes the diameter of the light flux so that the light from the optical head can be reliably imaged on the recording surface with no spherical aberration and excellent imaging performance. Good.

In claims 1 to 9, claim 11
As described above, the light flux changing member may form a light spot with less aberration as a conversion lens that changes the condensed state of the light flux.

[0031]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical recording / reproducing apparatus according to a first embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the structure of an optical recording / reproducing apparatus according to the first embodiment of the present invention, and FIG. 2 is a sectional view of the recording / reproducing section of FIG. 1 as an optical information recording medium. FIG. 3 is a diagram showing a converged state of a light spot, a support of an optical information recording medium, and a detecting means therefor.

In FIGS. 1 and 2, 100 is an optical information recording medium (optical disk), 1 is a semiconductor laser, 2 is a condenser lens for converting divergent light emitted from the semiconductor laser 1 into substantially parallel light flux, and 3 is a condenser. A beam splitter 4 having a shaping surface 3a for converting an elliptical light beam from the lens 2 into a true circular light beam, 4 is a rising mirror for reflecting the light beam from the beam splitter 3, and 5 is a reflected light from the rising mirror 4. An objective lens for converging on the recording surface 100a of the optical information recording medium 100, 6 is a diaphragm lens, and the light flux reflected by the optical information recording medium 100 is reflected by a reflecting surface 3b provided on the beam splitter 3, and the diaphragm lens 6 It is branched in the direction. 7 is a reflection mirror, 8 is a photodetector, and the reflection surface 3 of the beam splitter 3
The light beam reflected by b and passing through the aperture lens 6 is reflected by the reflection mirror 7.
And is detected by the photodetector 8.

Reference numeral 9 denotes an optical head housing, which is an optical head housing 9.
Further, the semiconductor laser 1, the condenser lens 2, the beam splitter 3, the rising mirror 4, the objective lens 5, the diaphragm lens 6, the reflection mirror 7, and the photodetector 8 fixed to the semiconductor laser 1.
The optical head 10 is configured by the above.

Reference numerals 11 and 12 denote shafts, which are a bearing portion 9a and a sliding portion 9b of the optical head housing 9, respectively.
0, and the optical head 10 is supported so as to be movable in the directions of arrows A and B. Further, 13 is a transfer motor that rotates in forward and reverse directions, 14 and 15 are power transmission means such as gears meshed with each other, and 16 is a lead screw that meshes with the screw portion 9c of the optical head housing 9. The lead screw 16 is a transfer screw. The motor 13 and the power transmission means 14 and 15 are driven to rotate in the forward and reverse directions to move the optical head 10 in the direction of arrow A or B.

These shafts 11 and 12, the transfer motor 1
3, the power transmission means 14 and 15, and the lead screw 16 constitute an optical head transfer means 17.

Reference numeral 18 is a disk motor, and 19 is a turntable on which an optical information recording medium is placed. And 20
Is a transfer system supporter that supports the optical head transfer means 17 and the disk motor 18.

Reference numeral 40 denotes a light flux changing member which has an opening flat plate 40a and is guided by the guide pins 9d and 9e by the long holes 40d and 40e, and the stopper 40f is the stopper pin 9f or 9.
It is supported on the optical head 10 so as to be able to move in parallel up to the position of g, and when the stopper 40f is in contact with the stopper pin 9f, it is an open flat plate 40a as shown by the solid line in the figure.
Is inserted into the optical path, and when the stopper 40f is in contact with the stopper pin 9g, the aperture plate 40a is in the state of being separated from the optical path as shown by the broken line in the figure.

Reference numeral 41 denotes a pin 4 provided on the light flux changing member 40.
0h and a pin 9h provided on the optical head housing 9, a stopper 40f is pressed against the stopper pin 9f by an urging means such as a torsion coil spring, which is inserted in the optical path. The light flux changing member 40 is biased so that the stopper 40f is pressed against the stopper pin 9g (broken line in the figure) when the aperture plate 40a is separated from the optical path.

The opening 2 provided in the transfer system support 20
0a is provided with protrusions 20c and 20d on both ends of the optical head 10 in the transfer direction, and the protrusion 20c moves the light flux changing member 40 to the state of the broken line when the optical head 10 moves in the direction of arrow B. The projection 20d is shaped to be pushed in the direction of arrow C, and the projection 20d is shaped to push the light flux changing member 40 in the direction of arrow D until the optical head 10 moves in the direction of arrow A to the state of the solid line. Such protrusions 20c, 20d
Is provided on the transfer system support 20, but it is not necessarily provided on the transfer system support 20, and may be provided at another portion of the apparatus. These protrusions 20c and 20d are provided at positions where they do not come into contact with the light flux changing member 40 in the range where the optical head 10 performs the recording / reproducing operation.

Although not shown in FIG. 1, reference numeral 140 denotes an optical information recording medium support (disc cartridge) for accommodating the optical information recording medium 100, and an accommodating opening 140a for recording / reproducing. A marking 140b indicating the substrate thickness of the optical information recording medium 100 is provided. Here, in the case of the optical information recording medium 100 'having a larger base material thickness than originally, a marking 140 different from the marking 140b is used.
The optical information recording medium support 140 'is provided with b'. Further, 141 is a sensor for reading the markings 140b, 140b ', which constitutes a detecting means together with a discriminating circuit 141' which discriminates the substrate thickness of the optical information recording medium 100 by receiving a detection signal from the sensor.

Further, FIG. 2A shows a recording / reproducing state of the optical information recording medium 100 having an original substrate thickness (for example, 0.6 mm), and FIG. The recording / reproducing state of a large (for example, 1.2 mm) optical information recording medium 100 'is shown.

The operation of the optical recording / reproducing apparatus configured as described above will be described below with reference to FIGS. 1 and 2.

First, the case where the optical information recording medium 100 having the original substrate thickness is inserted will be described. When the optical information recording medium 100 is housed in the optical information recording medium support 140 and inserted, the transfer system support 20 rises to mount and fix the optical information recording medium 100 on the turntable 19.

Next, the sensor 141 reads the marking 140b, and the discrimination circuit 141 'determines that the substrate has the original thickness. The transport motor 13 is driven to transport the optical head 10 in the direction of the arrow B, and the projection 20c projects the light beam. Change member 40 with arrow C
Push in the direction. The light flux changing member 40 is pushed in by a certain amount or more, and the pin 40h with which the biasing means 41 is engaged is the pin 9h.
After passing h, the force acting on the light flux changing member 40 of the biasing means 41 is converted in the direction of arrow C, and the light flux changing member 40 moves until the stopper 40f is pressed against the stopper pin 9g. In this state, the aperture plate 40a is out of the optical path, and the state shown in FIG. Then, the transfer motor 13 is driven to transfer the optical head 10 in the direction of arrow A to a position on the optical information recording medium 100 where recording / reproduction is started.

Next, the divergent light emitted from the semiconductor laser 1 is converted by the condenser lens 2 into an elliptical substantially parallel light beam, which is converted into a true circular light beam by the shaping surface 3a of the beam splitter 3, and then the rising mirror. It is reflected by 4 and goes toward the objective lens 5 without being blocked by the aperture plate. The light flux passing through the objective lens 5 is focused on the recording surface 100a of the optical information recording medium 100 to form a light spot 1a. The objective lens 5 is designed so that the state of the light spot 1a on the recording surface 100a of the optical information recording medium 100 having the original substrate thickness has the smallest aberration.

In the case of reproduction, the light reflected by the modulation of the light intensity again passes through the objective lens 5 and is reflected by the rising mirror 4 and enters the beam splitter 3. Then, after being reflected by the reflecting surface 3b of the beam splitter 3, passing through the diaphragm lens 6 and being reflected by the reflecting mirror 7, the reflected light is received by the photodetector 8 and the reproduction signal is detected, and the optical spot A control signal for controlling the position of 1a is also detected. While performing such an operation in the optical head 10, the optical information recording medium 100 is driven by the disk motor 18.
Is rotated, and at the same time, the optical head 10 is moved by the optical head transfer means 17 in the direction of arrow A or B to record / reproduce information.

Next, the case where the optical information recording medium 100 'having a thicker base material than the original is inserted will be described. When the optical information recording medium 100 ′ is housed and inserted in the optical information recording medium support 140 ′, the transfer system support 20 rises and the optical information recording medium 100 ′ is placed and fixed on the turntable 19. It

Next, the sensor 141 detects the marking 140b '.
Is read, and it is determined by a determination circuit (not shown) that the thickness is larger than the original substrate thickness, the transfer motor 13 is driven to transfer the optical head 10 in the direction of arrow A, and the projection 20d moves the light flux changing member 40 in the direction of arrow D. Push in. When the light flux changing member 40 is pushed in by a certain amount or more and the engaging pin 40h of the biasing means 41 passes through the pin 9h, the force acting on the light flux changing member 40 of the biasing means 41 is converted in the direction of arrow D, The light flux changing member 40 moves until the stopper 40f is pressed against the stopper pin 9f. In this state, the aperture plate 40a is inserted into the optical path, and the state shown in FIG. 2B is obtained. After that, the transfer motor 13 is driven to transfer the optical head 10 in the direction of arrow B to the position on the optical information recording medium 100 'at which recording / reproduction is started. Thereafter, the optical head 10 performs the same recording / reproducing operation as in the case of the original substrate thickness.

The difference from the original thickness of the substrate is that the diameter of the light beam emitted from the semiconductor laser 1 toward the objective lens 5 is limited by the aperture plate 40a. Thereby, the aperture ratio of the objective lens 5 can be apparently reduced,
Even for an optical information recording medium 100 ′ having a substrate thickness that is originally larger than the original thickness, the light spot 1a ′ can be converged on the recording surface 100a ′ with a small amount of spherical aberration.

As described above, according to the first embodiment of the present invention, the type of the optical information recording medium is detected and the optical head is specified even for the optical information recording medium having a larger base material than originally. By inserting an aperture plate that cuts a part of the light beam traveling from the semiconductor laser to the objective lens only by moving it to the position, the light spot can be converged on the recording surface with little spherical aberration, and high quality recording is possible. Alternatively, the structure for obtaining the reproduced signal can be realized at low cost.

Although the toggle spring is used as the urging means in the first embodiment of the present invention, the tension spring and the magnetic body,
Alternatively, the same operation and the same effect can be obtained by combining magnetic materials.

A second embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is a block diagram of an optical recording / reproducing apparatus showing a second embodiment of the present invention.

In the figure, 1 is a semiconductor laser, 2 is a condenser lens, 3 is a beam splitter, 4 is a rising mirror, 5 is an objective lens, 6 is a diaphragm lens, 7 is a reflection mirror, 8 is a photodetector, 9 is an optical head housing, 10 is an optical head, 11 and 12 are shafts, 13 is a transfer motor, 1
4 and 15 are power transmission means, 16 is a lead screw, 17 is an optical head transfer means, 18 is a disk motor,
19 is a turntable, 20 is a transfer system support, 100 is an optical information recording medium (optical disk), 140 is an optical information recording medium support (disk cartridge), 141 is a sensor, and the above is the first embodiment of the present invention. Since the configuration is the same as the above, the description is omitted.

The difference from the first embodiment of the present invention is that the moving operation of the light flux changing member is carried out not only by the projection of the transfer system support but also by cutting the energization of the electromagnet (driving means). This is the point where the number of locations is one.

A light flux changing member 50 has an aperture plate 50a, is guided by the guide pins 9d and 9e through elongated holes 50d and 50e, and is supported on the optical head 10 so as to be movable in parallel in the direction of arrow C or D. Cage, hook 50i and hook 9i
The stopper 50f is urged in the direction of arrow D by a tension spring (urging means) 51 suspended between the stopper plate 9f and the stopper pin 9f, and in this state, the aperture plate 50a is inserted into the optical path as shown by the solid line in the figure. It will be in a state of being.

Further, 53 is an iron piece fixed to the light flux changing member 50, 52 is an electromagnet (driving means) fixed on the optical head 10, the optical head 10 is transported in the direction of arrow B, and the luminous flux is projected by the projection 20c. When the changing member 50 moves in the direction of the arrow C to be in the state of the broken line and the iron piece 53 and the electromagnet 52 are close to each other facing each other, the electromagnet 52 is energized by means not shown, and the iron piece 53 and the electromagnet 52 are separated from each other. A magnetic force is generated between them to counter the force of the tension spring 51,
The light flux changing member 50 can be held in a broken line state. In this state, the aperture plate 50a is in a state of being separated from the optical path as shown by a broken line in the figure.

The optical information recording medium, the converged state of the optical spot, the support of the optical information recording medium and the detecting means thereof in this embodiment are the same as those in FIG.

The operation of the optical recording / reproducing apparatus configured as described above will be described below.

The optical information recording medium 100 is housed in the optical information recording medium support 140 and inserted into the apparatus, and the sensor 14
The base material thickness is detected by 1. When it is determined that the optical information recording medium has the original thickness of the base material, the transfer motor 13 is driven to transfer the optical head 10 in the arrow B direction, and the protrusion 20c pushes the light flux changing member 50 in the arrow C direction. At the same time, the electromagnet 52 is energized to generate an attractive force against the iron piece 53,
The light flux changing member 50 is held in the broken line state. In this state, the aperture plate 50a is out of the optical path, and the state shown in FIG. After this, the recording / reproducing operation is performed by the optical head 10.

If it is determined that the thickness of the base material of the optical information recording medium is originally larger than that of the optical head 10, the light flux changing member 50 can be cut by cutting off the electric current to the electromagnet 52 no matter where the optical head 10 is.
Is moved by the urging force of the tension spring 51 in the direction of arrow D until the stopper 50f hits the stopper pin 9f. In this state, the aperture flat plate 50a is inserted into the optical path, as shown in FIG.
It becomes the state of. After this, the recording / reproducing operation is performed by the optical head 10.

As described above, according to the second embodiment of the present invention, since the transfer system support 20 has only one protrusion, the transfer distance of the optical head 10 is reduced and the aperture flat plate 50a is inserted into and removed from the optical path. Therefore, it is possible to realize a low-cost and small-sized configuration for obtaining a high-quality recording or reproduction signal even for an optical information recording medium having a base material thicker than it should be.

The projecting portion 20c of the transfer system support 20 is moved to a diagonal position of the opening 20a, and the tension spring 51 is actuated in the direction in which the opening flat plate 50a separates from the optical path to move the opening flat plate 50a into the optical path. Even if the attraction force is generated by the electromagnet 52 in the inserted state, the same effect is obtained.

The third embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 is a block diagram of an optical recording / reproducing apparatus showing a third embodiment of the present invention.

In the figure, 1 is a semiconductor laser, 2 is a condenser lens, 3 is a beam splitter, 4 is a rising mirror, 5 is an objective lens, 6 is a diaphragm lens, 7 is a reflection mirror, 8 is a photodetector, 9 is an optical head housing, 10 is an optical head, 11 and 12 are shafts, 13 is a transfer motor, 1
4 and 15 are power transmission means, 16 is a lead screw, 17 is an optical head transfer means, 18 is a disk motor,
19 is a turntable, 20 is a transfer system support, 100 is an optical information recording medium (optical disk), 140 is an optical information recording medium support (disk cartridge), 141 is a sensor, and the above is the first embodiment of the present invention. Since the configuration is the same as the above, the description is omitted.

The difference from the first embodiment of the present invention is that the moving operation of the light flux changing member is performed not by the projection of the transfer system support,
This is a configuration in which the operation is performed by a solenoid (driving means), and the two protruding portions are eliminated.

Reference numeral 60 denotes a light flux changing member which has an opening flat plate 60a, is guided by guide pins 9d and 9e through elongated holes 60d and 60e, and is supported on the optical head 10 so as to be movable in parallel in the arrow C or D direction. Cage, hook 60i and hook 9i
The stopper 60f is urged in the direction of arrow D by a tension spring (biasing means) 61 suspended between the stopper plate 9f and the stopper pin 9f. In this state, the aperture plate 60a is inserted into the optical path as shown by the solid line in the figure. It will be in a state of being.

Further, 62 is a solenoid (driving means),
The iron core 62a is fixed to the bent portion 60b of the light flux changing member 60, and when the solenoid 62 is energized by a means (not shown), the iron core 62a is pulled in the direction of arrow C, so that the light flux changing member 60 opposes the force of the tension spring 61. Move to the position indicated by the broken line. In this state, the aperture plate 60a is separated from the optical path as shown by the broken line in the figure. When the power supply to the solenoid 62 is cut off again, the light flux changing member 60 returns to the position indicated by the solid line by the urging force of the tension spring 61.

Further, the optical information recording medium and the converged state of the optical spot, the support of the optical information recording medium and the detecting means thereof in this embodiment are the same as those in FIG.

The operation of the optical recording / reproducing apparatus configured as described above will be described below.

The optical information recording medium 100 is inserted into the apparatus while being housed in the optical information recording medium support 140, and the sensor 14
The base material thickness is detected by 1. When it is determined that the optical information recording medium 100 has the original substrate thickness, the solenoid 62 is energized to draw the light flux changing member 60 in the direction of arrow C and hold it in the state of the broken line. In this state, the aperture plate 60a is out of the optical path, and the state shown in FIG. After this, the optical head 10
Recording / reproducing operation is performed.

When it is determined that the substrate thickness of the optical information recording medium is originally larger than that, if the solenoid 62 is de-energized, the light flux changing member 60 is urged by the tension spring 61 in the direction of arrow D. The stopper 60f is the stopper pin 9
Move until you hit f. In this state, the aperture plate 60a is inserted into the optical path, and the state shown in FIG. 2B is obtained. After this, the recording / reproducing operation is performed by the optical head 10.

As described above, according to the third embodiment of the present invention, the protrusion of the transfer system support 20 is not necessary, and the optical head 1
The aperture flat plate 60a can be inserted into and removed from the optical path by further reducing the transport distance of 0, and a compact structure for obtaining a high-quality recording or reproducing signal even for an optical information recording medium having a base material thicker than it should be. Can be realized.

The extension flat plate 60a is actuated in the direction in which the flat aperture plate 60a is separated from the optical path, and the flat aperture plate 60a is opened.
Even if the solenoid 62 is energized at the time of inserting into the optical path, the same effect can be obtained.

A fourth embodiment of the present invention will be described below with reference to the drawings.

FIG. 5 is a block diagram of an optical recording / reproducing apparatus showing a fourth embodiment of the present invention.

In the figure, the optical information recording medium 100 (optical disk), the optical information recording medium support 140 (disk cartridge), the optical configuration included in the optical head 10, the optical head transfer means included in the transfer system support 20, and The optical information recording medium rotating means 18 and 19 have the same configuration as that of the first embodiment of the present invention, and are designated by the same reference numerals and their description is omitted.

The difference from the first embodiment of the present invention is that the base material thickness of the optical information recording medium is not detected and no protrusion is provided in the opening of the transfer system support, and the original base material thickness is not provided. In this configuration, the light flux changing member is directly moved by the projection provided on the optical information recording medium support, and the aperture flat plate is inserted into and removed from the optical path.

That is, the marking 140b and the sensor 141 on the optical information recording medium support 140 are eliminated, and the protrusion 20 provided in the opening 20a of the transfer system support 20.
Remove c and 20d.

Reference numeral 70 denotes a light flux changing member which has an opening flat plate 70a, is guided by guide pins 9d and 9e by elongated holes 70d and 70e, and is supported on the optical head 10 so as to be movable in parallel in the direction of arrow C or D. Cage, hook 70i and hook 9i
Is urged in the direction of arrow D by a tension spring 71 hung between and.

The optical information recording medium support 140 accommodating the optical information recording medium 100 having the original substrate thickness is provided with a rib 140c extending in the transfer direction of the optical head 10, and the light flux changing member 7 is provided.
The light flux changing member 7 interferes with the bent portion 70c provided at 0.
0 is pushed in the direction of arrow C. In this state, the aperture plate 70a is separated from the optical path as shown by the solid line in the figure.

Further, the optical information recording medium support 140 'containing the optical information recording medium 100' having a substrate thickness larger than the original thickness is accommodated.
In this case, since there is no rib, the light flux changing member 70 is biased in the direction of arrow D by the tension spring 71, and the stopper 70f
Moves until it hits the stopper pin 9f, and in this state, the aperture plate 70a is inserted into the optical path as shown by the broken line in the figure. Further, the optical information recording medium and the converged state of the optical spot, the support of the optical information recording medium and the detecting means thereof in this embodiment are the same as those in FIG.

The operation of the optical recording / reproducing apparatus configured as described above will be described below.

In the initial state, the optical head 10 and the transfer system support 20 that supports it are retracted downward. Therefore, the light flux changing member 70 is urged by the tension spring 71,
This is the state in which the stopper 70f has moved in the direction of arrow D until it abuts on the stopper pin 9f, that is, the state of the broken line. The optical information recording medium support 140 accommodating the optical information recording medium 100 is inserted therein from the outside of the apparatus in the direction of arrow E.

Next, the transfer system support 20 is moved in the direction of arrow F, and is raised to a position (the position shown in the drawing) where the optical head 10 can record / reproduce on the optical information recording medium 100. Then, the bent portion 70c is pushed by the rib 140c, and the light flux changing member 7
When 0 is pushed in the direction of arrow C, the aperture plate 70a is removed from the optical path, and the state shown in FIG. After this, the optical head 10 is moved in the direction of arrow A or B to perform the recording / reproducing operation. However, since the rib 140c extends in the moving direction, the state of the light flux changing member 70 is maintained.

Further, in the case of the optical information recording medium 100 'having a thickness larger than the original thickness of the substrate, the state where the aperture plate 70a is inserted in the optical path is maintained even if the transfer system support 20 is raised in the direction of the arrow F in FIG. Recording / reproduction is performed in the state of (b).

As described above, according to the fourth embodiment of the present invention, the protrusion of the transfer system support 20 is not necessary, and the optical head 1
The transfer distance of 0 can be further reduced, and the opening flat plate 70a can be inserted into and removed from the optical path with a compact structure. Moreover, even without adding a driving means, even for an optical information recording medium having a larger base material thickness. It is possible to realize a configuration for obtaining a high quality recording or reproduction signal at low cost and in a small size.

The fifth embodiment of the present invention will be described below with reference to the drawings.

FIG. 6 is a block diagram of an optical recording / reproducing apparatus showing a fifth embodiment of the present invention.

In the figure, the optical information recording medium 100 (optical disk), the optical configuration included in the optical head 10, the optical head transfer means and the optical information recording medium rotating means 18 and 19 included in the transfer system support 20, are the main components. The configuration is the same as that of the first embodiment of the invention, and the same numbers are assigned and the description thereof is omitted.

The difference from the first embodiment of the present invention is that the installation position of the optical information recording medium and the recording / reproducing position of the transfer system support are set to different positions corresponding to the substrate thickness of the optical information recording medium. The light flux changing member is moved by the protrusion provided in the movement path between these positions, and the aperture flat plate is inserted into and removed from the optical path.

That is, in the present invention, instead of the marking 140b and the sensor 141, detection means for determining the substrate thickness of the optical information recording medium according to the installation position is provided, and the protrusions 20c and 20d provided on the transfer system support 20 are provided. Instead, a protrusion is provided on the chassis.

The optical information recording medium 100 having the original substrate thickness is
The optical information recording medium 100 'having a larger base material thickness than originally should be installed at a lower position as shown in the drawing by an unillustrated erroneous insertion prevention shape or the user's selection of the insertion position. Only one of them can be installed.

Reference numeral 142 is the optical information recording medium 1 having the original substrate thickness.
00 is a detecting means for detecting 00, and 143 is a detecting means for detecting an optical information recording medium 100 'having a base material thicker than originally, and determines the base material thickness of the optical information recording medium depending on which is installed.

Reference numeral 80 denotes a light flux changing member, which is an aperture plate 80.
a, and the guide pins 9d and 9e in the long holes 80d and 80e.
Is guided by the optical head 10 so that the stopper 40f can move in parallel in the direction of arrow C or D until it hits the stopper pin 9f or 9g.
1 urges in the arrow C direction or the arrow D direction. Three
Reference numeral 0 denotes a chassis having a driving means (not shown) that supports the transfer system support 20 and moves it in the direction of arrow F or G, and has projections 30a and 30b on the moving path of the transfer system support 20.
Is provided.

The protrusion 30a is provided in a shape that pushes the light flux changing member 80 in the direction of arrow C when the transfer system support 20 is at the position (20B) for recording / reproducing the optical information recording medium 100 having the original substrate thickness. The protrusion 30b is the transfer system support 20.
Is at a position (20C) for recording / reproducing the optical information recording medium 100 'having a base material thicker than originally, the light flux changing member 8
It is provided in a shape that pushes 0 in the direction of arrow D.

The operation of the optical recording / reproducing apparatus configured as described above will be described below.

In the initial state, the transfer system support 20 is 20A.
At the position of, the optical information recording medium 100 is in a retracted state with respect to the insertion in the direction of the arrow H. The optical head 10
Is moved to a position where the light flux changing member 80 interferes with the protrusions 30a and 30b as shown in the figure.

Next, the optical information recording medium 100 having the original substrate thickness is obtained.
Is inserted in the direction of arrow H, the detection means 142 detects this and raises the transfer system support 20 to the position of 20B in the direction of arrow F. In this state, the optical information recording medium 100 is placed and fixed on the turntable 19. Further, the light flux changing member 80 is pushed in the direction of arrow C by the protrusion 30a, but when the light flux changing member 80 is pushed in by a certain amount or more and the pin 80h engaged with the biasing means 81 passes through the pin 9h, the biasing force is applied. The force acting on the light flux changing member 80 of the means 81 is converted in the direction of arrow C, and the light flux changing member 80 is moved by the stopper 40.
It moves until f is pressed against the stopper pin 9g.
In this state, the aperture flat plate 80a is out of the optical path, and as shown in FIG.
It becomes the state of. Then, the optical head 10 is moved in the direction of arrow B to perform the recording / reproducing operation on the optical information recording medium 100.

In the case of the optical information recording medium 100 'having a thickness larger than the original thickness of the base material, the detection means 143 makes a determination to raise the transfer system support 20 to the position of 20C in the direction of arrow F. In this state, the optical information recording medium 100 'is placed and fixed on the turntable 19. The light flux changing member 80 is pushed in the direction of arrow D by the protrusion 30b, and the force of the biasing means 81 turned in the direction of arrow D moves the light flux changing member 80 until the stopper 40f is pushed against the stopper pin 9f. Open plate 80 in this state
2a is inserted into the optical path, and the state shown in FIG. Then, the optical head 10 is moved in the direction of arrow B to perform the recording / reproducing operation on the optical information recording medium 100 '.

As described above, according to the fifth embodiment of the present invention, the aperture plate can be inserted into and removed from the optical path only by moving the transfer system support 20, and the optical information recording having a larger base material thickness than it should be. Even for a medium, it is possible to realize a configuration for obtaining a high quality recording or reproducing signal at low cost.

When the protrusion 30a and the optical information recording medium 100 having the original substrate thickness are provided in the lower stage, the protrusion 30b is formed.
And an optical information recording medium 100 'which is thicker than the original substrate thickness.
Although the above is provided in the upper stage, the same effect can be obtained even if the configuration is upside down.

In all the embodiments of the present invention, the aperture plate is used as the light flux changing member. However, as shown in FIG. 7, a conversion lens is used for an optical information recording medium having a substrate thickness larger than it should be. The concave conversion lens 9 as shown in FIG.
0a, and for an optical information recording medium having a substrate thickness smaller than the original, as shown in FIG. 7A, a convex conversion lens 91 is used.
By setting a, it is possible to form a light spot with a small amount of aberration.

In all the embodiments of the present invention, the aperture flat plate is configured to be inserted into and removed from the optical path between the objective lens and the raising mirror. For example, between the shaping surface and the reflecting surface of the beam splitter, etc. Even if it is provided in the optical path where the light flux is circular parallel light, the same effect is obtained.

[0107]

As described above, according to the present invention, the light flux changing member provided in the optical path from the semiconductor laser in the optical head to the objective lens is adapted to the thickness of the base material of the optical information recording medium or its type. It is equipped with a structure for inserting / removing the optical head, and this inserting / removing operation is performed by moving the optical head to a specific position.
Alternatively, by using a special shape provided on the optical information recording medium support, it is possible to record or reproduce an optical information recording medium having a different base material thickness with a single optical head in a state with less aberration, which is small and inexpensive. It becomes possible to provide an optical recording / reproducing apparatus.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an optical recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a diagram showing an optical information recording medium of an optical recording / reproducing apparatus (aperture plate) and a condensed state of a light spot in the first embodiment of the present invention.

FIG. 3 is a configuration diagram of an optical recording / reproducing apparatus in a second embodiment of the present invention.

FIG. 4 is a configuration diagram of an optical recording / reproducing apparatus in a third embodiment of the present invention.

FIG. 5 is a configuration diagram of an optical recording / reproducing apparatus in a fourth embodiment of the present invention.

FIG. 6 is a configuration diagram of an optical recording / reproducing apparatus in a fifth embodiment of the present invention.

FIG. 7 is a diagram showing an optical information recording medium of an optical recording / reproducing apparatus (conversion lens) and a condensed state of a light spot in an example of the present invention.

FIG. 8 is a configuration diagram of an optical head of a conventional optical recording / reproducing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 semiconductor laser 3 beam splitter 5 objective lens 6 diaphragm lens 8 photodetector 10 optical head 17 optical head transfer means 20 transfer system support 20c, 20d protrusions (transfer system support) 30a, 30c protrusion (chassis) 52 electromagnet (Driving unit) 62 Solenoid (Driving unit) 40, 50, 60, 70, 80 Luminous flux changing member 40a, 50a, 60a, 70a, 80a Flat plate 90a, 91a Conversion lens 100 Optical information recording medium 140 Optical information recording medium support 140c rib 141 detecting means

Claims (11)

[Claims] 1. A light emitted from a semiconductor laser is condensed on an optical information recording medium through a beam splitter and an objective lens, and reflected light is reflected by a beam splitter in a direction different from that of incident light from the semiconductor laser. An optical head that causes a photodetector to receive light through a diaphragm lens; a light flux changing member that is insertable and removable with respect to an optical path from a semiconductor laser in the optical head to an objective lens; Optical head transfer means for transferring on the surface of the information recording medium, a protrusion provided on the transfer path of the optical head, and a portion for accommodating or mounting the optical information recording medium and facing the objective lens of the optical head. For detecting the difference between the optical information recording medium support which is opened over the range in which the optical head is transported and the substrate thickness of the optical information recording medium or the type of the optical information recording medium. Means for moving the optical head to a specific position based on a detection signal from the detection means, and causing the projection portion on the transfer path to perform the insertion / removal operation of the light flux changing member. Optical recording / reproducing device. 2. The projections are respectively provided on the gaps at both ends in the transfer direction of the optical head, and the light flux changing member is inserted in one projection by the transfer of the optical head in one transfer direction. , The optical head is pushed in the other direction by the other direction of the optical head, and when the optical head is pushed a certain amount or more, the movement of the optical head is restricted by the action of the urging means to the insertion or removal position. The optical recording / reproducing apparatus according to claim 1, wherein 3. Light emitted from a semiconductor laser is condensed on an optical information recording medium via a beam splitter and an objective lens, and reflected light is reflected by a beam splitter in a direction different from the incident light from the semiconductor laser. An optical head that causes a photodetector to receive light through a diaphragm lens; a light flux changing member that is provided so as to be insertable into and removable from the optical path from the semiconductor laser in the optical head to the objective lens; and drives the light flux changing member. Driving means, an optical head transfer means for moving the optical head on the surface of the optical information recording medium, and a portion for accommodating or mounting the optical information recording medium, the portion facing the objective lens of the optical head being the optical A detector for detecting a difference between the optical information recording medium support which is opened over the range in which the head is transported and the substrate thickness of the optical information recording medium or the type of the optical information recording medium. DOO wherein the light said driving means based on a detection signal from the detection means and performing insertion withdrawal operation of the light flux changing member recording and reproducing apparatus. 4. A protrusion is provided at one end of the optical head in the transfer direction, and the light flux changing member is urged by an urging means toward either the insertion position or the withdrawal position. The light flux changing member is moved by the protrusion in the one direction of the insertion position or the removal position by the movement of the optical head in the one movement direction, against the biasing means, and by the driving means. 4. The optical recording / reproducing apparatus according to claim 3, wherein the optical recording / reproducing apparatus is selectively held at the moving position in response to the detection output of the detecting means. 5. The luminous flux changing member is urged by an urging means in either one of the insertion position and the withdrawal position, and in response to the detection output of the detection means, the drive means is operated to detect the insertion position or the withdrawal position. The optical recording / reproducing apparatus according to claim 3, wherein the optical recording / reproducing apparatus is moved in one of the other directions. 6. The marking means, which is provided on the optical information recording medium support according to the difference in the base material thickness or type of the optical information recording medium, and a sensor for reading the marking.
6. An optical recording / reproducing apparatus according to claim 1, further comprising a discriminating circuit for discriminating a substrate thickness of an optical information recording medium in response to a detection signal from the sensor. . 7. Light emitted from a semiconductor laser is condensed on an optical information recording medium via a beam splitter and an objective lens, and reflected light is reflected by a beam splitter in a direction different from the incident light from the semiconductor laser. An optical head that causes a photodetector to receive light through a diaphragm lens; a light flux changing member that is insertable and removable with respect to an optical path from a semiconductor laser in the optical head to an objective lens; An optical head transfer means for transferring on the surface of the information recording medium, and an optical information recording medium is housed or placed, and a portion of the optical head facing the objective lens is opened over a range in which the optical head is transferred, An optical information recording medium support having a different shape according to a difference in substrate thickness or type, each shape of the optical information recording medium support and the optical head An optical recording / reproducing apparatus, wherein an operation of inserting / removing the light flux changing member is performed by interfering with or not interfering with the above light flux changing member. 8. The optical information recording medium support selectively has a protrusion extending in the transport direction of the optical head according to a difference in substrate thickness or type, and the light flux changing member has a direction of this protrusion. 8. The optical recording / reproducing device according to claim 7, wherein the light flux changing member has an insertion / removal operation by having a bent portion at a bent portion, and the projection portion interferes with or does not interfere with the bent portion. apparatus. 9. Light emitted from a semiconductor laser is condensed on an optical information recording medium via a beam splitter and an objective lens, and reflected light is reflected by a beam splitter in a direction different from the incident light from the semiconductor laser. An optical head that causes a photodetector to receive light through a diaphragm lens; a light flux changing member that is insertable and removable with respect to an optical path from a semiconductor laser in the optical head to an objective lens; An optical head transfer means for transferring on the surface of the information recording medium, a transfer system support for moving the optical head and the optical head transfer means, and an optical information recording medium are housed or placed on the optical head. The portion facing the objective lens is opened over the range in which the optical head moves, and is installed at a predetermined position according to the difference in the substrate thickness or type of the optical information recording medium. Optical information recording medium support, and detection means for detecting a difference in the base material thickness or type of the optical information recording medium from the installation position of the optical information recording medium support, The transfer system support is configured to move to a position where the optical head can perform a recording / reproducing operation on the optical information recording medium. An optical recording / reproducing device characterized by being performed. 10. The optical recording / reproducing apparatus according to claim 1, wherein the light flux changing member has an aperture plate for changing the diameter of the light flux. 11. The optical recording / reproducing apparatus according to claim 1, wherein the light flux changing member is a conversion lens that changes a condensed state of the light flux.