JPH11161969A - Optical recording / reproducing device - Google Patents

Abstract

(57) Abstract: An object of the present invention is to provide an optical recording / reproducing apparatus in which a plurality of optical heads are properly arranged in a cartridge opening and characteristics are not affected even if the positions of the optical heads are different. SOLUTION: A plurality of optical heads 20 each including an optical element 31 for irradiating light to a recording medium 21 housed in a cartridge 22 having an opening 23 and a carriage 28.
a, 20b, and 20c, optical head moving mechanisms 26, 27, and 32 arranged radially from the center to move the optical head in a direction crossing the information track, and first and second guide members 29 and 30. An optical head guide mechanism for guiding the movement of the optical head, medium drive mechanisms 24, 33, and 35 for rotating the recording medium, and an elastic member 39 for holding the optical head.
And

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an optical recording / reproducing apparatus using a plurality of optical heads and a recording medium stored in a cartridge.

[0002]

2. Description of the Related Art A conventional optical recording / reproducing apparatus records / reproduces data on / from a recording medium using one optical head. However, the data transfer speed is slower than that of a hard disk, and it takes a very long time to record and reproduce a large amount of data. Therefore, a method for speeding up the recording and reproduction of data by using a plurality of optical heads has been studied. In addition, rewritable optical disks such as magneto-optical disks are usually housed in cartridges so that the disk surface is not damaged and data recording / reproduction is not possible, and are configured so that the optical head can be accessed from the opening. It is basically assumed that only one optical head is arranged in this opening, and it is difficult to arrange a plurality of optical heads. A method for resolving this difficulty and arranging a plurality of optical heads in the opening has been studied.

A conventional apparatus for recording and reproducing data at high speed by arranging a plurality of optical heads in a cartridge opening of an optical disk is disclosed in, for example, Japanese Patent Application Laid-Open No. H4-113537. FIG. 13 is a plan view showing a conventional optical recording / reproducing apparatus, and FIG. 14 is a side view of FIG.
13 and 14, 1 is a cartridge, 2 is an optical disk, 3a and 3b are optical heads, 4a and 4b are objective lenses, 5a and 5b are linear motors, 6 is a center rail, 7
a and 7b are side rails, and 8 is an opening.

[0004] The function and operation of the optical recording / reproducing apparatus thus configured will be described. The optical recording / reproducing apparatus shown in FIGS. 13 and 14 includes a plurality of optical heads 3a and 3b which can independently access one optical disk 2 housed in the cartridge 1. Optical head 3
a and 3b are provided with objective lenses 4a and 4b for irradiating the optical disk 2 with laser light and linear motors 5a and 5b as driving means for driving the optical heads 3a and 3b in a direction crossing the tracks of the optical disk 2. Are guided by a center rail 6 and a side rail 7a as guide means,
The optical head 3b is guided by the center rail 6 and the side rail 7b. In other words, since the center rail 6 is shared by the optical heads 3a and 3b, the dimension in the track direction can be reduced, and a plurality of optical heads 3a and 3b can be arranged in the standardized opening 8 of the cartridge 1. It was done.

[0005]

However, in the conventional magneto-optical disk drive, a part (center rail) of the guide means of the plurality of optical heads 3a and 3b is shared to reduce the dimension in the track direction. However, the effect is only slight in the shared portion, and the unshared portion of the guide means (side rail) still hinders reduction in size, so that more than two optical heads are placed in the opening of the cartridge. However, there is a problem that it is very difficult to dispose them in a location.

The magneto-optical disk drive shown in FIGS. 13 and 14 is provided with two optical heads. When the respective optical heads are on the inner peripheral side and the outer peripheral side of the optical disk, There is a problem in that the track tangent direction at each objective lens position is different, and the tracking error signal varies.

Further, in the optical recording / reproducing apparatus composed of a plurality of optical heads as described above, there are no restrictions on the arrangement positions and recording positions of the plurality of optical heads, and the operator of the optical recording / reproducing apparatus has previously specified the position. After the data reading is completed and the data recording / playback is completed, it is not to return to the predetermined position and prepare for the next operator's request,
Since the plurality of optical heads do not move efficiently, there is a problem in that the moving of the optical heads wastes and the data access time increases. That is,
When data is read by a plurality of optical heads, data reading in the lead-in area is not performed by a plurality of optical heads, and data is read only by one optical head as in the conventional case. Has not been made.

In addition, in response to a request for recording / reproducing by an operator of the optical recording / reproducing apparatus, an efficient arrangement of the optical head is not performed, and one data is read by a plurality of optical heads or a plurality of operations are performed. Is not controlled for simultaneous access requests by the user. As a result, there has been a problem that a high-speed response cannot be effectively realized even when a plurality of optical heads are used in response to a recording / reproducing request to an operator of the optical recording / reproducing apparatus. .

In this optical recording / reproducing apparatus, a plurality of optical heads can be properly arranged in the cartridge opening, and the characteristics of the optical heads are not affected even if the position of the optical disk is different, and a high-speed response is obtained. Is required.

According to the present invention, a plurality of optical heads can be appropriately arranged in the cartridge opening, and the characteristics of the optical head can be prevented from being affected even if the position of the optical head with respect to the optical disk is different. It is an object of the present invention to provide a high-speed response optical recording / reproducing apparatus.

[0011]

SUMMARY OF THE INVENTION In order to solve this problem, the present invention comprises an optical element for irradiating a recording medium housed in a cartridge having an opening with light and a carriage on which the optical element is mounted. A plurality of optical heads, an optical head moving mechanism for moving the plurality of optical heads in a direction transverse to the information track of the recording medium, and an optical head for guiding the movement of the optical heads, the first and second guide members. There is provided a configuration having a guide mechanism, a medium drive mechanism that rotationally drives the recording medium, and an elastic member that holds the optical head.

Thus, a plurality of optical heads can be properly arranged in the cartridge opening, and the characteristics of the optical head can be prevented from being affected even if the position of the optical head with respect to the optical disk is different. A response optical recording / reproducing apparatus is obtained.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention comprises an optical element for irradiating a recording medium contained in a cartridge having an opening with light, and a carriage for mounting the optical element. A plurality of optical heads, an optical head moving mechanism radially disposed from the center of the recording medium, and moving the plurality of optical heads in a direction crossing the information tracks of the recording medium, and first and second guide members. An optical head guide mechanism for guiding the movement of the optical head, a medium drive mechanism for driving the recording medium to rotate, and an elastic member for holding the optical head. Is held neutral, and when fine adjustment is required in the information track direction, the optical head bends and moves.

According to a second aspect of the present invention, a plurality of optical heads each including an optical element for irradiating light to a recording medium housed in a cartridge having an opening and a carriage for mounting the optical element are provided. An optical head moving mechanism disposed radially from the center of the medium to move a plurality of optical heads in a direction transverse to the information track of the recording medium; and first and second guide members for guiding the movement of the optical head. An optical head guide mechanism, a medium drive mechanism that rotationally drives a recording medium,
A guide shaft for guiding the optical head in the information track direction is provided. When fine adjustment is required in the information track direction, the optical head is moved by the guide shaft.

According to a third aspect of the present invention, there is provided an optical head comprising: an optical element for irradiating light to a recording medium housed in a cartridge having an opening; and a carriage for mounting the optical element; An optical head guide mechanism, which comprises first and second guide members and guides the movement of the optical head, and a plurality of optical heads which are arranged radially from the center of the recording medium and rotate the first guide mechanism. An optical head moving mechanism for moving in a direction traversing the information track of the recording medium;
It has a medium drive mechanism for rotating and driving the recording medium, and a vertical axis for moving the optical head in the information track direction. It has the effect of arranging it at an arbitrary position where

According to a fourth aspect of the present invention, a plurality of optical heads each including an optical element for irradiating light to a recording medium housed in a cartridge having an opening and a carriage for mounting the optical element are provided. An optical head moving mechanism disposed radially from the center of the medium to move a plurality of optical heads in a direction transverse to the information track of the recording medium; and first and second guide members for guiding the movement of the optical head. An optical head guide mechanism, a medium drive mechanism that rotationally drives a recording medium,
The optical head has a stopper member that prevents rattling due to acceleration and vibration that occurs when the optical head moves long in the information track direction, which prevents rattling and shortens the track adjustment time of the optical head. Has an action.

According to a fifth aspect of the present invention, a plurality of optical heads each including an optical element for irradiating a recording medium contained in a cartridge having an opening with light and a carriage for mounting the optical element are provided. An optical head moving mechanism comprising an elliptical yoke coil and a magnet, radially disposed from the center of the recording medium, and moving a plurality of optical heads in a direction crossing the information tracks of the recording medium; And an optical head guide mechanism for guiding the movement of the optical head and a medium drive mechanism for rotating the recording medium. The optical head has an increased cross-sectional area of the yoke coil. This has the effect of increasing the power of the moving mechanism.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. (Embodiment 1) FIGS. 1 to 3 show the configuration of an optical recording / reproducing apparatus according to Embodiment 1 of the present invention. FIG. 1 is a configuration diagram of an optical recording / reproducing apparatus according to Embodiment 1 of the present invention.
1A is a plan view showing an optical recording / reproducing apparatus according to Embodiment 1 of the present invention, FIG. 1B is a sectional view taken along the line AA of FIG. 1A, and FIG. FIG. 3 is a partial side view of the optical recording / reproducing apparatus according to Embodiment 1. FIG. 2 is a partially enlarged sectional view of FIG. 3 is an enlarged view of the fine adjustment mechanism of FIG. 1. FIG. 3A is a plan view showing the fine adjustment mechanism in the information track direction, and FIG. 3B is a side view showing the fine adjustment mechanism in the information track direction. FIG.

1 to 3, reference numerals 20a, 20b, 2
0c is an optical head, 21 is an optical disk as a recording medium, 2
Reference numeral 2 denotes a cartridge for protecting the optical disk 21 from dirt and damage and for convenient storage, 23 denotes an opening provided in the cartridge 22, 24 denotes a spindle motor, 25a, 25b, 25c denotes an objective lens, and 26 denotes an objective lens. A yoke, 27 is a magnet, 28 is a carriage, 29 is a guide shaft as a first guide member, 30 is a sub guide shaft as a second guide member, 31 is a laser unit having a laser light source and a light receiving element, and 32 is a laser unit. A coil provided on the carriage 28, a rotating shaft 33, a turntable 35, a lens holder base 36, a lens holder 37,
38 is a lens holder mounting leaf spring, 39 is a lens holder base fixing leaf spring as an elastic member, 40 is a focus coil, 41 is a focus yoke, 43 is a reflection mirror, 45 is a sub tracking yoke, 46 is a sub tracking coil, 47 Is a sub-tracking magnet.

In FIG. 1, the yoke 26, the guide shaft 29 and the sub-guide shaft 30 constitute an optical head moving mechanism, and the spindle motor 24, the rotating shaft 33 and the turntable 35 constitute a medium driving mechanism.

The functions and the like of the optical recording / reproducing apparatus configured as described above will be described. The optical disk 21 is mounted on a spindle motor 24 and driven to rotate. The optical heads 20a, 20b, and 20c are provided with objective lenses 25a, 25b, and 25c for irradiating the optical disc 21 with laser light.
1 is moved in a range including the innermost information to the outermost information. The optical heads 20a, 20b, and 20c are provided with a coil 32. The coil 32 constitutes a linear motor together with a magnetic circuit including a yoke 26 and a magnet 27. When a current flows through the coil 32, the optical heads 20a, 20b,
20c is driven. Optical heads 20a, 20b, 20c
The optical heads 20a, 20b, and 20c record and reproduce all data on the optical disk 21 in conjunction with the movement of the optical disk 21 and the rotation of the optical disk 21 as described above.
In the optical heads 20a, 20b and 20c, a carriage 28 as a base thereof is guided by a guide shaft 29 and a sub guide shaft 30.

The optical disk 21 is placed on a turntable 35 fitted with a rotating shaft 33 of a spindle motor 24, and is nipped and rotated. The objective lens 25a is fixed on a lens holder 37, and two lens holder mounting leaf springs 38 are mounted on the lens holder 37. One end of the lens holder mounting leaf spring 38 is attached to the lens holder base 36. Fixed. Lens holder 3
7, a focus coil 40 is provided.
An actuator for driving the objective lens 25a in a direction orthogonal to the recording surface of the optical disk 21 is configured together with the focus yoke 41 provided on the optical disk 21. The objective lens 25a moves toward or away from the optical disk 21 depending on the direction of the current flowing through the focus coil 40.

Reference numeral 43 denotes a reflection mirror provided on the carriage 28. The reflection mirror 43 bends the light emitted from the laser unit 31 into the objective lens 25a and causes the light to enter the objective lens 25a, and conversely reflects the light reflected from the optical disk 21 and passed through the objective lens 25a. The light is reflected to the laser unit 31. The optical heads 20a, 20b, and 20c are driven in the tracking direction by a linear motor constituted by a magnetic circuit including a yoke 26 and a magnet 27, and further perform fine tracking. 45 is a carriage 28 as a device for performing fine tracking.
, A sub-tracking yoke provided on the lens holder base 46,
47 is a sub-tracking magnet attached to the sub-tracking yoke 45. The sub-tracking yoke 45, the sub-tracking coil 46, and the sub-tracking magnet 47, which constitute the fine adjustment mechanism, operate in the same manner as the operation of the focus coil, and perform fine tracking of the carriage 28.

Next, the operation and operation of the optical recording / reproducing apparatus according to the present embodiment will be described. The laser light emitted from the laser unit 31 is reflected by the reflection mirror 43, enters the objective lens 25a, is collected, and forms a spot on the recording surface of the optical disk 21. Optical disk 21
The laser light reflected by the light source passes through the objective lens 25a again, is reflected by the reflection mirror 43, returns to the laser unit 31, and enters a light receiving element (not shown). The light receiving element converts the reflected light from the optical disc 21 into the objective lens 2.
The position of the objective lens 25a is corrected by detecting the positional deviation in the track direction with respect to the focused spot in 5a and feeding back this to the control circuit to control the current flowing through the focus coil 40 and the coil 32.

In the movement of the carriage 28 in the tracking direction, the carriage 28 is moved in the tracking direction by applying a current to the coil 32 to generate a propulsive force by the yoke 26 and the magnet 27. Further, in order to move the lens holder 37 to a target track, an electric current is supplied to the sub-tracking coil 46, and the sub-tracking yoke 45 and the sub-tracking magnet 47 cause the lens holder base fixing leaf spring to move as shown in FIG. 39
Bends in the direction of the arrow due to the elastic force of Then, the optical head 20b can be moved to the target track position by moving the optical head 20b in the tracking direction by the deflection of the lens holder base fixing leaf spring 39.

As described above, according to the present embodiment, the linear motor composed of the yoke 26, the magnet 27, and the coil 32 is provided below the objective lens 25a and on the guide shaft 29.
The optical heads 20a to 20c can be very small in the track direction because they are disposed between the optical heads 20a to 20c. Since the driving center of the linear motor can be approached during this period, the rotational moment of the optical head generated by the driving force of the linear motor can be reduced, and the adverse effect on recording and reproduction can be reduced. In addition, the position of the optical head is normally held neutral by the lens holder base fixing leaf spring 39 as an elastic member, and the optical head can be flexed and moved when fine adjustment is required in the information track direction. Fine adjustment of the optical head in the information track direction becomes possible.

(Embodiment 2) FIGS. 4 to 6 show the configuration of an optical recording / reproducing apparatus according to Embodiment 2 of the present invention. FIG. 4 is a configuration diagram of an optical recording / reproducing apparatus according to Embodiment 2 of the present invention. FIG. 4 (a) is a plan view showing an optical recording / reproducing apparatus according to Embodiment 2 of the present invention, and FIG. Is B in FIG.
FIG. 4 is a cross-sectional view taken along line B. 5 is a partially enlarged view of FIG. 4, and FIG. 5A is a partially enlarged view of FIG. 4A, and FIG.
4B is a partially enlarged view of FIG. 4B, and FIG. 5C is a partially enlarged side view of FIG. 4A. FIG. 6 is an operation explanatory diagram of the optical recording / reproducing apparatus according to the second embodiment of the present invention.

4 to 6, the optical heads 20a, 20a,
0b, 20c, optical disc 21, cartridge 22, opening 23, spindle motor 24, objective lens 25a,
25b, 25c, yoke 26, magnet 27, carriage 2
8, guide shaft 29, sub guide shaft 30, laser unit 31, coil 32, turntable 35,
The lens holder base 36, lens holder 37, lens holder mounting leaf spring 38, focus coil 40, focus yoke 41, reflection mirror 43, sub tracking yoke 45, sub tracking coil 46, and sub tracking magnet 47 are the same as those in FIGS. Therefore, the same reference numerals are given and the description is omitted.

Reference numeral 50 denotes a lens holder base guide shaft, and reference numeral 51 denotes a lens holder base sub-guide shaft.

The functions and the like of the optical recording / reproducing apparatus configured as described above will be described. The optical disk 21 is mounted on a spindle motor 24 and driven to rotate. The optical heads 20a, 20b, and 20c are provided with objective lenses 25a, 25b, and 25c for irradiating the optical disk 21 with laser light. Move the included range. The optical heads 20a, 20b and 20c have coils 32
The coil 32 constitutes a linear motor together with a magnetic circuit including the yoke 26 and the magnet 27, and the coil 32
Current flows through the optical heads 20a and 20a.
b and 20c are driven. Optical heads 20a, 20b, 2
The optical heads 20a, 20b, and 20c record and reproduce all data on the optical disk 21 in conjunction with the movement of the optical disk 21 and the rotation of the optical disk 21 as described above. In the optical heads 20a, 20b and 20c, a carriage 28 as a base thereof is guided by a guide shaft 29 and a sub guide shaft 30.

The optical disk 21 is placed on a turntable 35 fitted with a rotating shaft 33 of a spindle motor 24, and is nipped and driven to rotate. The objective lens 25a is fixed on a lens holder 37, and two lens holder mounting leaf springs 38 are mounted on the lens holder 37. One end of the lens holder mounting leaf spring 38 is attached to the lens holder base 36. Fixed. The lens holder base 36 is guided by a lens holder base guide shaft 50 and a lens holder base sub-guide shaft 51 (fine adjustment mechanism) that guide the lens holder base 36 in the track direction in the arrow direction as shown in FIG. You. The lens holder 37 is provided with a focus coil 40, and together with a focus yoke 41 provided on the carriage 28, constitutes an actuator for driving the objective lens 25a in a direction perpendicular to the recording surface of the optical disk 21. The objective lens 25a moves toward or away from the optical disk 21 depending on the direction of the current flowing through the focus coil 40.

Reference numeral 43 denotes a reflection mirror provided on the carriage 28. The reflection mirror 43 folds the light emitted from the laser unit 31 into the objective lens 25a and makes it enter the objective lens 25a, and conversely reflects the light from the optical disk 21 and passes through the objective lens 25a. Is reflected to the laser unit 31. Yoke 26 and magnet 27
The optical heads 20a, 20b, and 20c are driven in the tracking direction by a linear motor composed of a magnetic circuit composed of 45 is a carriage 28 as a device for performing fine tracking.
, A sub-tracking yoke provided on the lens holder base 46,
47 is a sub-tracking magnet attached to the sub-tracking yoke 45. The sub-tracking yoke 45, the sub-tracking coil 46, and the sub-tracking magnet 47 operate in the same manner as the above-described operation of the focus coil, and perform minute tracking of the carriage 28.

Next, the operation and operation of the optical recording / reproducing apparatus according to the present embodiment will be described. The laser light emitted from the laser unit 31 is reflected by the reflection mirror 43, enters the objective lens 25a, is collected, and forms a spot on the recording surface of the optical disk 21. Optical disk 21
The laser light reflected by the light source passes through the objective lens 25a again, is reflected by the reflection mirror 43, returns to the laser unit 31, and enters a light receiving element (not shown). The light receiving element converts the reflected light from the optical disc 21 into the objective lens 2.
The position of the objective lens 25a is corrected by detecting the positional deviation in the track direction with respect to the focused spot in 5a and feeding back this to the control circuit to control the current flowing through the focus coil 40 and the coil 32.

In the movement of the carriage 28 in the tracking direction, the carriage 28 is moved in the tracking direction by applying a current to the coil 32 to generate a propulsive force by the yoke 26 and the magnet 27. Further, in order to move the lens holder 37 to a target track, a current is supplied to the sub-tracking coil 46, and the sub-tracking yoke 45 and the sub-tracking magnet 47
As shown in FIG. 6, by moving the lens holder base in the direction of the arrow and also moving the optical head 20b in the tracking direction, the optical head 20b can be moved to the target track position.

As described above, according to the present embodiment, the linear motor composed of the yoke 26, the magnet 27, and the coil 32 is provided below the objective lens 25a and on the guide shaft 29.
Since the optical head 20a is arranged between the optical head 20a and the sub-guide shaft 30, the optical head 20a has a very fine dimension in the track direction. Since the drive center of the motor can be approached, the rotational moment of the optical head generated by the drive force of the linear motor can be reduced, and the adverse effect on recording and reproduction can be reduced. In addition, since the optical head 20a has the guide shaft 50 for the lens holder base and the sub guide shaft 51 for the lens holder base as a guide shaft for guiding the optical head 20a in the information track direction, fine adjustment can be performed in the information track direction. .

(Embodiment 3) FIG. 7 is a configuration diagram of an optical recording / reproducing apparatus according to Embodiment 3 of the present invention. FIG.
FIG. 7A is a plan view showing an optical recording / reproducing apparatus according to Embodiment 3 of the present invention, and FIG. 7B is a cross-sectional view taken along line CC of FIG. 7A. In FIG. 7, the optical heads 20a, 20b, 20
c, optical disk 21, cartridge 22, opening 23,
Spindle motor 24, objective lenses 25a, 25b, 2
5c, yoke 26, magnet 27, carriage 28, guide shaft 29, sub guide shaft 30, laser unit 31, coil 32, rotating shaft 33, turntable 3
5, lens holder base 36, lens holder 37, lens holder mounting leaf spring 38, lens holder base fixing leaf spring 39, focus coil 40, focus yoke 41, reflection mirror 43, sub tracking yoke 4
5, the sub-tracking coil 46 and the sub-tracking magnet 47 are the same as those in FIGS.

55 is a power motor, 56 is an intermediate gear, 57
Is a final gear, and 58 is a lead screw shaft.

The functions and the like of the optical recording / reproducing apparatus configured as described above will be described. The optical disk 21 is mounted on a spindle motor 24 and driven to rotate. The optical heads 20a, 20b, and 20c are provided with objective lenses 25a, 25b, and 25c for irradiating the optical disk 21 with laser light. Move the included range. In addition to the movement of the optical heads 20a, 20b, and 20c and the rotation of the optical disk 21 as described above, the optical heads 20a, 20b, and 20c record and reproduce all data on the optical disk 21. Optical head 20
a, 20b and 20c are the carriages 28 which are the bases thereof.
A power motor 55 as a power source, an intermediate gear 56 for transmitting power, a final gear 57 for receiving power from the intermediate gear,
The rotation of the lead screw shaft 58 to which the final gear 57 is attached moves in the track direction and is guided by the sub guide shaft 30. Reference numeral 31 denotes a laser unit including a laser light source and a light receiving element.

The optical disk 21 is mounted on a turntable 35 on a rotating shaft 33 (see FIG. 1) of a spindle motor 24, and is nipped and driven to rotate. Also, the objective lens 2
5a is fixed on a lens holder 37, and two lens holder attaching leaf springs 38 are attached to the lens holder 37, and one end of the lens holder attaching leaf spring 38 is fixed to the lens holder base 36. The lens holder 37 is provided with a focus coil 40 (see FIG. 1), and together with a focus yoke 41 provided on the carriage 28, constitutes an actuator for driving the objective lens 25a in a direction perpendicular to the recording surface of the optical disk 21. The objective lens 25a moves toward or away from the optical disk 21 depending on the direction of the current flowing through the focus coil 40.

Reference numeral 43 denotes a reflection mirror provided on the carriage 28. The reflection mirror 43 bends the light emitted from the laser unit 31 into the objective lens 25a to make it enter the objective lens 25a, and conversely reflects the light reflected from the optical disk 21 and passed through the objective lens 25a. The light is reflected to the laser unit 31. Power motor 55, intermediate gear 56, final gear 57, lead screw shaft 58
The optical heads 20a, 20b, and 20c are driven in the tracking direction by a carriage driving mechanism (optical head moving mechanism) constituted by. 45 is a sub-tracking yoke provided on the carriage 28;
Is a sub-tracking coil attached to the lens holder base, and 47 is a sub-tracking magnet attached to the sub-tracking yoke 45. The sub-tracking yoke 45, the sub-tracking coil 46, and the sub-tracking magnet 47 operate in the same manner as the above-described operation of the focus coil, and perform minute tracking of the carriage 28.

Next, the operation and operation of the optical recording / reproducing apparatus according to the present embodiment will be described. The laser light emitted from the laser unit 31 is reflected by the reflection mirror 43, enters the objective lens 25a, is collected, and forms a spot on the recording surface of the optical disk 21. Optical disk 21
The laser light reflected by the light source passes through the objective lens 25a again, is reflected by the reflection mirror 43, returns to the laser unit 31, and enters a light receiving element (not shown). The light receiving element converts the reflected light from the optical disc 21 into the objective lens 2.
The position of the objective lens 25a is corrected by detecting the positional deviation in the track direction with respect to the focused spot in 5a and feeding back this to the control circuit to control the current flowing through the focus coil 40 and the coil 32.

When the carriage 28 moves in the tracking direction, the power motor 55 rotates, the intermediate gear 56 and the final gear 57 rotate the lead screw shaft 58,
The carriage 28 is moved in the tracking direction. Further, in order to move the lens holder 37 to a target track, a current is applied to the sub-tracking coil 46,
As shown in FIG. 3, the lens spring 39 for fixing the lens holder base is bent in the direction of the arrow by the elastic force of the plate spring 39 for fixing the lens holder base, as shown in FIG. Then, the optical head 20b can be moved to the target track position by moving the optical head 20b in the tracking direction by the deflection of the lens holder base fixing leaf spring 39.

Next, FIG. 8 is a comparative sectional view of the first and third embodiments of the present invention. FIG. 8A is a schematic sectional view showing an optical recording / reproducing apparatus according to the third embodiment, and FIG.
1 is a schematic sectional view showing an optical recording / reproducing apparatus according to Embodiment 1. FIG. As can be seen from a comparison between t1 in FIG. 8A and t2 in FIG. 8B, the optical recording and reproducing apparatus according to the third embodiment is thinner in the height direction than the optical recording and reproducing apparatus according to the first embodiment. (T1 <t2).

As described above, according to the present embodiment, FIG.
As shown in the figure, the optical recording / reproducing apparatus according to the present embodiment can reduce the distance in the height direction as compared with the optical recording / reproducing apparatus shown in the first and second embodiments (the embodiment). The height according to the configuration of the third embodiment is t1, and the height according to the configuration of the first embodiment is t2). This is because the yoke 26 required in the first and second embodiments becomes unnecessary, and the power motor 57 for moving the optical head 20a can be moved to an arbitrary position such as a thin optical disk drive (the lead screw in FIG. 7). (A position above the shaft 58).

(Embodiment 4) In the structures described in Embodiments 1, 2, and 3, particularly in Embodiments 2 and 3, the lens holder base 36 is provided with the lens holder base guide shaft 50 and the lens holder base. It is only guided by the sub guide shaft 51 for use, and is not in a state of being held. Therefore, a stopper mechanism for fixing and holding the lens holder base 36 at an arbitrary position with respect to the carriage 28 when the carriage 28 moves along the yoke 26 will be described with reference to FIG.

FIG. 9 is an enlarged sectional view of an optical recording / reproducing apparatus according to Embodiment 4 of the present invention, and FIG. 9 (a) is a partial sectional view showing the optical recording / reproducing apparatus according to Embodiment 4 of the present invention. FIG. 9B is a side view of FIG. 9, the yoke 26, magnet 27, carriage 28, guide shaft 29, sub guide shaft 30, coil 32, lens holder base 36, lens holder 37, lens holder mounting leaf spring 38, focus coil 40, focus yoke 41, lens Since the holder base guide shaft 50 is the same as that in FIGS. 4 to 6, the same reference numerals are given and the description is omitted. Reference numeral 60 denotes a stopper coil provided in the carriage 28, and 61 denotes a stopper shaft fixed to the stopper coil 60 and moving up and down in the carriage 28. The stopper coil 60 and the stopper shaft 61 constitute a stopper member.

The components newly added to the optical recording / reproducing apparatus shown in FIG. 9 include a stopper coil 60, as shown in FIG.
It is a stopper shaft 61.

Next, the operation and operation of the optical recording / reproducing apparatus according to the fourth embodiment will be described with reference to FIG. FIG. 10 is a view for explaining the operation of the stopper mechanism according to the fourth embodiment, and FIG.
10B is a state diagram showing a state before the tip of the stopper shaft 61 is inserted into a concave portion provided on the bottom of the lens holder base 36. FIG.
FIG. 4 is a state diagram showing a state of being inserted into a concave portion provided at the bottom of FIG.

First, the carriage 28 moves in the tracking direction by applying a current to the coil 32 to generate a propulsive force by the yoke 26 and the magnet 27. At this time, if the carriage 28 is not fixed and is in a free state, the optical head cannot be moved to the target track position. Therefore, when moving the carriage 28 in the tracking direction, an electric current is supplied to the stopper coil 60.
Then, as shown in FIG. 10A, a force for raising the stopper coil 60 is generated between the magnetic flux generated from the yoke 26 and the magnet 27 and the stopper coil 60. Then, the stopper shaft 61 is lifted together with the stopper coil 60, and the tip of the stopper shaft 61 is inserted into a concave portion provided at the bottom of the lens holder base 36.
As a result, the lens holder base 36 is fixed to the carriage 28. Furthermore, when the current supplied to the stopper coil 60 is interrupted when the carriage 28 is transported to the target track position, the force for raising the stopper coil 60 is lost, and the tip of the stopper shaft 61 is The lens holder base 36 is released again from the concave portion provided at the bottom. Fine tracking is performed with the lens holder base 36 in a free state.

As described above, according to the present embodiment, the acceleration generated when the optical head moves long in the information track direction,
By providing the stopper coil 60 and the stopper shaft 61 for preventing rattling due to vibration, it is possible to prevent rattling at the time of moving the optical head, and it is possible to shorten the track adjustment time of the optical head.

(Embodiment 5) In the structure described in Embodiments 1, 2, and 3, the carriage 28 generates a propulsive force by applying a current to the coil 32 to generate a propulsive force by the yoke 26 and the magnet 27. Move in tracking direction. This propulsion can be increased by increasing the shape of the yoke 26. However, when trying to enlarge the shape of the yoke 26, the carriage 2
Since the shape of No. 8 must also be increased in proportion, the shape cannot be easily changed. FIG. 11 shows a shape that solves this. FIG. 11 is a side view showing a comparison between the second and fifth embodiments, and FIG. 11A is a partial side view showing an optical head propulsion mechanism according to the second embodiment.
(B) is a partial side view showing the optical head propulsion mechanism in the present embodiment. FIG. 12 is an enlarged view of a main part of FIG. 11B, FIG. 12A is a perspective view showing an optical head propulsion mechanism in the present embodiment, and FIG. It is X section sectional drawing of a). 11 and 12, the optical disk 21, the cartridge 22, the yoke 2
6, magnet 27, guide shaft 29, sub-guide shaft 30, coil 32, sub-tracking yoke 45, sub-tracking coil 46, and sub-tracking magnet 47 are the same as those in FIGS. Is omitted.

As shown in FIG. 11 (b), by adding an arc shape to the upper and lower portions of the yoke 26 to form an elliptical cross section, the cross sectional area of the yoke 26 is increased, and the magnetic flux density is increased. As shown in FIG. 12, the force generated between the coil 32 is increased. As a result, since the propulsive force of the carriage 28 is increased, the moving speed of the carriage 28 in the tracking direction can be improved, and an optical head that searches for a target track at high speed can be realized.

As described above, according to the present embodiment, the optical head moving mechanism includes the yoke 26 and the coil 32 having an oval cross section.
And the magnet 27, the cross-sectional area of the yoke 26 can be increased, the magnetic flux density can be increased, and the force generated between the yoke 26 and the coil 32 can be increased. Since the propulsive force is increased, the moving speed of the carriage 28 in the tracking direction can be improved, and an optical head for searching a target track at high speed can be realized.

[0054]

According to the optical recording / reproducing apparatus according to the first aspect of the present invention, there is provided an optical element for irradiating a recording medium contained in a cartridge having an opening with light, and a carriage for mounting the optical element. A plurality of optical heads, a plurality of optical heads arranged radially from the center of the recording medium, and an optical head moving mechanism for moving the plurality of optical heads in a direction crossing the information tracks of the recording medium; and first and second guides An optical head guide mechanism for guiding the movement of the optical head, a medium drive mechanism for driving the recording medium to rotate, and an elastic member for holding the optical head. Radially arranged from the optical head, an advantageous effect that the optical head can be miniaturized and a plurality of optical heads can be appropriately arranged in the cartridge opening can be obtained, and the elastic member Normally, the position of the optical head is kept neutral and the optical head can be flexed and moved when fine adjustment is required in the information track direction, so that the optical head can be finely adjusted in the upper track direction, The advantageous effect that high-speed response can be obtained without affecting the characteristics of the optical head even when the position of the optical head with respect to the optical disk is different is obtained.

According to the second aspect of the present invention, there are provided a plurality of optical heads each including an optical element for irradiating a recording medium contained in a cartridge having an opening with light and a carriage for mounting the optical element. An optical head moving mechanism disposed radially from the center of the recording medium and moving a plurality of optical heads in a direction crossing the information tracks of the recording medium;
By having an optical head guide mechanism for guiding the movement of the optical head, a medium drive mechanism for driving the recording medium to rotate, and a guide shaft for guiding the optical head in the information track direction, the optical head comprises a second guide member. By arranging the head moving mechanism radially from the center of the recording medium, it is possible to obtain an advantageous effect that the optical head can be miniaturized and a plurality of optical heads can be properly arranged in the cartridge opening, and the information can be obtained. When fine adjustment is required in the track direction, the optical head can be moved by the guide shaft, so that fine adjustment in the upper track direction of the optical head is possible, and even if the position of the optical head with respect to the optical disk is different, the characteristics of the optical head are different. , And has an advantageous effect that a high-speed response can be achieved without affecting.

According to the third aspect of the present invention, there are provided a plurality of optical heads each including an optical element for irradiating a recording medium contained in a cartridge having an opening with light and a carriage for mounting the optical element. An optical head guide mechanism for guiding the movement of the optical head, and a plurality of light sources arranged radially from the center of the recording medium and rotating the first guide mechanism. By having an optical head moving mechanism for moving the head in a direction transverse to the information track of the recording medium, a medium driving mechanism for driving the recording medium to rotate, and a vertical axis for moving the optical head in the information track direction, the optical By arranging the head moving mechanism radially from the center of the recording medium, it is possible to reduce the size of the optical head and to appropriately arrange a plurality of optical heads in the cartridge opening. With interest effect is obtained, the optical head moving mechanism for moving the optical head can be arranged for instance a motor at an arbitrary position, advantageous effect that the optical disk drive can be thinned to obtain.

According to the fourth aspect of the present invention, there are provided a plurality of optical heads each including an optical element for irradiating a recording medium contained in a cartridge having an opening with light and a carriage for mounting the optical element. An optical head moving mechanism disposed radially from the center of the recording medium and moving a plurality of optical heads in a direction crossing the information tracks of the recording medium;
An optical head guide mechanism for guiding the movement of the optical head, a medium drive mechanism for rotating and driving the recording medium, and rattling due to acceleration and vibration generated when the optical head moves in the information track direction for a long time. The optical head moving mechanism is arranged radially from the center of the recording medium by having a stopper member for preventing the optical head from being downsized, so that the optical head can be miniaturized and the plurality of optical heads can be appropriately arranged in the cartridge opening. In addition to the advantageous effect of the optical head, it is possible to obtain the advantageous effect of preventing backlash and shortening the track adjustment time of the optical head.

According to the fifth aspect of the present invention, a plurality of optical heads each including an optical element for irradiating light to a recording medium housed in a cartridge having an opening and a carriage for mounting the optical element are provided. An optical head moving mechanism, comprising a yoke coil and a magnet having an elliptical cross section, radially arranged from the center of the recording medium, and moving a plurality of optical heads in a direction transverse to the information tracks of the recording medium; , A second guide member, and an optical head guide mechanism for guiding the movement of the optical head, and a medium drive mechanism for rotationally driving the recording medium. With this arrangement, an advantageous effect that the optical head can be miniaturized and a plurality of optical heads can be appropriately arranged in the cartridge opening can be obtained, and
The advantageous effect that the power of the optical head moving mechanism can be increased by increasing the cross-sectional area of the yoke coil can be obtained.

[Brief description of the 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 partially enlarged sectional view of FIG. 1;

FIG. 3 is an enlarged view of the fine adjustment mechanism of FIG. 1;

FIG. 4 is a configuration diagram of an optical recording / reproducing device according to a second embodiment of the present invention.

FIG. 5 is a partially enlarged view of FIG. 4;

FIG. 6 is an operation explanatory diagram of the optical recording / reproducing apparatus according to the second embodiment of the present invention;

FIG. 7 is a configuration diagram of an optical recording / reproducing device according to a third embodiment of the present invention.

FIG. 8 is a comparative cross-sectional view of Embodiments 1 and 3 of the present invention.

FIG. 9 is an enlarged sectional view of an optical recording / reproducing apparatus according to a fourth embodiment of the present invention.

FIG. 10 is an operation explanatory view of a stopper mechanism according to the fourth embodiment.

FIG. 11 is a side view comparing Embodiments 2 and 5 of the present invention.

FIG. 12 is an enlarged view of a main part of FIG. 11 (b).

FIG. 13 is a plan view showing a conventional optical recording / reproducing apparatus.

FIG. 14 is a side view of FIG.

[Explanation of symbols]

 20a, 20b, 20c Optical Head 21 Optical Disk (Recording Medium) 22 Cartridge 23 Opening 24 Spindle Motor (Medium Driving Mechanism) 25 Objective Lens 26 Yoke (Optical Head Moving Mechanism) 27 Magnet (Optical Head Moving Mechanism) 28 Carriage 29 Guide Shaft (Optical head guiding mechanism) 30 Sub guide shaft (optical head guiding mechanism) 31 Laser unit (optical element) 32 Coil (optical head moving mechanism) 33 Rotation axis (medium driving mechanism) 35 Turntable (medium driving mechanism) 36 Lens holder Base 37 Lens holder 38 Lens holder mounting leaf spring 39 Lens holder base fixing leaf spring (elastic member) 40 Focus coil 41 Focus yoke 43 Reflecting mirror 45 Sub tracking yoke 46 Sub tracking coil 47 Sub tracking Racking magnet 50 Guide shaft for lens holder base 51 Sub guide shaft for lens holder base 55 Power motor 56 Intermediate gear 57 Final gear 58 Lead screw shaft 60 Stopper coil 61 Stopper shaft

Claims (5)

[Claims] A plurality of optical heads each including an optical element for irradiating a recording medium contained in a cartridge having an opening with light and a carriage for mounting the optical element; and a radial head from a center of the recording medium. And an optical head moving mechanism for moving the plurality of optical heads in a direction crossing the information track of the recording medium, and a light for guiding the movement of the optical head. A head guide mechanism, a medium drive mechanism that rotationally drives the recording medium,
An optical recording / reproducing apparatus, comprising: an elastic member that holds the optical head. 2. A plurality of optical heads each including an optical element for irradiating light to a recording medium housed in a cartridge having an opening and a carriage on which the optical element is mounted, and a radial head from the center of the recording medium. And an optical head moving mechanism for moving the plurality of optical heads in a direction crossing the information track of the recording medium, and a light for guiding the movement of the optical head. A head guide mechanism, a medium drive mechanism that rotationally drives the recording medium,
An optical recording / reproducing apparatus, comprising: a guide shaft for guiding the optical head in an information track direction. 3. A plurality of optical heads each including an optical element for irradiating a recording medium contained in a cartridge having an opening with light and a carriage for mounting the optical element, and first and second guides. An optical head guide mechanism configured to guide the movement of the optical head; and an optical head guide mechanism disposed radially from a center of the recording medium, and rotating the first guide mechanism to record the plurality of optical heads. An optical head moving mechanism for moving in a direction traversing the information track of the medium;
An optical recording / reproducing apparatus, comprising: a medium drive mechanism for rotating and driving the recording medium; and a vertical axis for moving the optical head in an information track direction. 4. A plurality of optical heads each including an optical element for irradiating a recording medium contained in a cartridge having an opening with light and a carriage for mounting the optical element, and a plurality of optical heads radially from the center of the recording medium. And an optical head moving mechanism for moving the plurality of optical heads in a direction crossing the information track of the recording medium, and a light for guiding the movement of the optical head. A head guide mechanism, a medium drive mechanism that rotationally drives the recording medium,
An optical recording / reproducing apparatus, comprising: a stopper member for preventing rattling due to acceleration and vibration generated when the optical head moves in the information track direction for a long time. 5. A plurality of optical heads each including an optical element for irradiating a recording medium contained in a cartridge having an opening with light and a carriage for mounting the optical element, and a yoke coil having an elliptical cross section. An optical head moving mechanism, which is radially arranged from the center of the recording medium and moves the plurality of optical heads in a direction crossing the information track of the recording medium; and first and second guides. An optical recording / reproducing apparatus comprising: an optical head guide mechanism configured to guide movement of the optical head; and a medium drive mechanism configured to rotationally drive the recording medium.