JPH0944875A - Optical pickup device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an optical pickup device substantially thinner without causing high-order resonance due to lack of rigidity on a lens holder in the optical pickup device for recording/reproducing an optical disk in a case. SOLUTION: In the optical pickup device 1, the part opposite to an opening 211 of an optical disk case on an upper end surface 49 of its device frame 4 is made a projection surface 49a, and in the lens holder 3 arranged inside the frame 4, the part of the side attaching an object lens 2 is made the projection surface 34a. These projection parts are arranged in a free space of a disk loading part on which the case opening 211 is placed. Thus, the device height H1 required inside a main body of the optical disk device is reduced to H0 substantially. Further, the lens holder 3 has a section shape with a step, and the part of its lens attaching side is protruded to the case opening 211 side as the whole to secure a sufficient thickness. Thus, the rigidity of this part is secured, and such evil effect that high-order resonance becomes easy to occur, is evaded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to recording / recording on an optical disc mounted in a disc mounting portion of an optical disc device.
The present invention relates to an optical pickup device incorporated for reproducing or one of these. More specifically, the present invention relates to a structure for reducing the thickness of such an optical pickup device.

[0002]

2. Description of the Related Art As an optical pickup device for recording / reproducing on / from an optical disc, there is known an optical pickup device having a magnetic drive mechanism for accurately focusing a recording / reproducing light beam on a specified track of the optical disc. Has been.

For example, Japanese Patent Application Laid-Open No. 1-3070
Japanese Patent Publication No. 29 discloses an optical pickup device equipped with this type of magnetic drive mechanism. As disclosed in this publication, an optical pickup device generally includes an objective lens for focusing a light beam on a designated recording track position on an optical disc, a lens holder holding the objective lens, It has a holder shaft that supports the lens holder.

The lens holder is
It is supported so as to be movable in its axial direction, and is also supported so as to be rotatable about its axis. A magnetic drive circuit for tracking and a magnetic drive circuit for focusing are configured between the lens frame holder and the side of the device frame supporting the holder shaft. In other words, a magnetic drive mechanism for the objective lens held therein is configured.

These magnetic drive circuits are composed of, for example, a magnetic coil arranged on the side of the lens holder and a magnet arranged on the side of the apparatus frame which is the fixed side, and control the direction of the current applied to the magnetic coil. As a result, the direction of the generated magnetic force can be switched. By the magnetic drive circuit for focusing, the objective lens
Focusing is performed by moving toward and away from the recording surface of the optical disc. In addition, the tracking magnetic circuit causes the objective lens to rotate around a holder axis orthogonal to the recording surface of the optical disc, move in the radial direction of the recording surface of the optical disc, and be controlled to reach a designated track position. To be done.

With the demand for miniaturization of the optical disk device in which the optical pickup device having this structure is mounted, there is an increasing demand for miniaturization, particularly for its thinness. In view of this point, Japanese Patent Application Laid-Open No. 2-193326 discloses a configuration for reducing the thickness (height) of the optical pickup device. In the invention disclosed in this publication, a part of the storage space of the reflection mirror built in the optical pickup device for reflecting the light beam from the optical system toward the objective lens side is also formed on the lens holder side. In this way, the thickness of the device is reduced.

[0007]

In order to reduce the thickness of the optical pickup device, the lens holder itself may be thinned. However, if the lens holder is made thin, the rigidity thereof is also reduced, so that the high-order resonance frequency is also reduced, and the resonance is likely to occur. When such resonance occurs during operation, accurate focusing,
It is not preferable because it hinders the tracking operation.
In particular, in the part of the lens holder where the objective lens is attached, a space for the optical path is formed there, so
When the thickness is reduced, the rigidity is greatly reduced.

Further, since the distance between the objective lens and the recording surface of the optical disc mounted in the apparatus is generally regulated, the objective lens side is directed toward the mounting portion side of the optical disc so that this distance is achieved. It may be supported in a protruding state. In particular, in the case where the optical disc is built in the case, each case is inserted into the disc mounting portion of the optical disc device, and in conjunction with this insertion operation, the shutter closing the opening of the disc case opens. Recording and reproduction are performed on the optical disk in the case by the optical pickup device through the opening opened. Therefore, in this case, the distance between the objective lens and the recording surface of the optical disc generally tends to be long, and therefore only the objective lens must be supported in a state of protruding toward the case opening. When the structure in which only the objective lens is supported in a protruding state is adopted in this way, the rigidity of the mounting portion of the objective lens in the lens holder is likely to decrease.

Therefore, there is a limit to making the lens holder thinner. That is, there is a limit to the thinning of the device simply by making the lens holder thin.

An object of the present invention is to realize an optical pickup device used for recording / reproducing on / from an optical disc in a case, and to realize a thin structure as a whole without causing high-order resonance in a lens holder due to insufficient rigidity. To do.

[0011]

In order to solve the above-mentioned problems, the present invention focuses on the case opening of the optical disk mounted in the disk mounting portion on the side of the optical disk device in which the optical pickup device is incorporated. By utilizing a space corresponding to the thickness of the case in the case opening and disposing a part of the lens holder also in this portion, the thickness of the installation location of the optical pickup device on the optical disk device side can be reduced. .

That is, according to the present invention, an objective lens, a lens holder for holding the objective lens, and an optical axis direction of the objective lens are arranged in parallel, and the lens holder is movable in the axial direction and rotatable about the axis. In an optical pickup device having a supporting holder shaft, an apparatus frame supporting the holder shaft, and a magnetic drive mechanism for moving and rotating the lens holder, at least the lens holder has at least the objective lens. It is characterized in that a part of the attached portion is arranged by utilizing a space in which a case opening of an optical disc mounted in a disc mounting portion of an optical disc device is located. Further, the portion of the device frame facing the case opening can also be arranged by utilizing the space where the case opening is located.

As described above, according to the present invention, a part of the lens holder is arranged by utilizing the case opening portion of the optical disc mounted on the disc mounting portion formed on the optical disc device side. Therefore,
It is possible to reduce the height (thickness) of the assembling space of the optical pickup device which is required to be formed on the optical disc device side for incorporating the optical pickup device.

In other words, the thickness of the lens holder is thinned to the extent that problems such as higher-order resonance do not occur, and the side of the lens holder on which the objective lens is mounted in the thinned lens holder is the disc mounting portion. To the side,
If this portion can be arranged so as to enter the space corresponding to the thickness of the case, the height required as an installation space for the optical pickup device can be further reduced by that amount.

In general, the first surface of the lens holder on which the objective lens is mounted is at least the surface portion on the side on which the objective lens is mounted with respect to the holder shaft of the disk mounting portion. As the stepped surface that is a protruding surface that protrudes to the side, the protruding surface may be positioned in a space corresponding to the thickness of the case.

The second surface of the lens holder located on the opposite side of the first surface is at least the first surface.
As a stepped surface in which a surface portion on the side corresponding to the protruding surface in the surface of the device is a retracted surface retracted to the side of the disk mounting portion, the retracted surface and a portion of the device frame facing the retracted surface. A reflection mirror for directing the incident light in the optical axis direction of the objective lens may be disposed between and. If this configuration is adopted, the reflection mirror can be installed without increasing the height (thickness) of the optical pickup device.

Here, the magnetic drive mechanism includes a tracking magnetic drive circuit that rotates the lens holder around the holder shaft and a focusing magnetic drive circuit that moves the lens holder along the holder shaft. The tracking magnetic drive circuit is supported by the apparatus frame so as to face the magnetic coils mounted on the outer peripheral surface of the lens holder on a straight line passing through the objective lens and the holder axis. And a magnet. Similarly, the magnetic drive circuit for focusing is supported by the magnetic coil mounted on the outer peripheral surface of the lens holder orthogonal to the magnetic coil of the magnetic circuit for tracking and the device frame so as to face the magnetic coils. And a magnet that is formed. In this case, one magnetic coil forming the tracking magnetic drive circuit and two magnetic coils forming the focusing magnetic drive circuit are included in the lens holder in which the protruding surface of the first surface is formed. Can be attached to the outer peripheral side.

In the case of an arrangement in which the lens holder is moved up and down for focusing, a driving force for such focusing requires a force larger than the driving force for tracking, so a large magnetic coil is attached. The need arises. By adopting the configuration of the present invention, the focusing magnetic coil can be arranged in the thick portion (the side having the height) in the optical pickup device.
This is convenient for placing a focusing magnetic coil having a large size.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

1, 2 and 3 show a schematic structure of an optical pickup device to which the present invention is applied. As shown in these figures, the optical pickup device 1 is assembled to an assembly portion 110 in the main body of an optical disk device (not shown). In the main body of the optical disc device, the optical disc 20 is placed at a position facing the optical pickup device 1.
A disk mounting portion 120 for inserting 0 is formed. The optical disc 200 mounted here has a case 21
The case 210 has a case opening 211 for recording / reproducing, and the opening 211 is closed by a shutter (not shown) when the case 210 is not mounted in the optical disk device. Has been done.

When the optical disc 200 housed in the case 210 is inserted into the disc mounting portion 120, the shutter that closes the case opening 211 opens in association with the inserting operation, and the optical disc 200 is inserted through the opening 211. The recording surface 201 of the optical disc 200 is exposed. The recording surface 201 exposed through the opening 211 is irradiated with the light beam L from the optical pickup device 1 side, and the recording surface 201 is exposed.
Information is written to and read from. Since the structure of the mounting portion of such an optical disc is known, further description is omitted.

The optical pickup device 1 has an objective lens 2 for irradiating the recording surface 201 of the optical disc 200 with the light beam L, and the objective lens 2 is a lens holder 3.
Mounted on The lens holder 3 is supported by a holder shaft 5 that extends vertically from a bottom plate 41 of the device frame 4 at approximately the center thereof. In detail, while being movable in the direction of the axis 5a of the holder shaft 5,
It is rotatably supported around the axis 5a. The axis 5a of the holder shaft is set to be parallel to the optical axis of the objective lens 2.

Further, the lens holder 3 and the device frame 4
A magnetic drive mechanism including magnetic drive circuits 6 and 7 for focusing and magnetic drive circuits 8 and 9 for tracking is formed between them. Magnetic drive circuits 6 and 7 for focusing
Thereby, the lens holder 3 moves up and down along the holder shaft 5 to focus the objective lens attached thereto. Further, the magnetic drive circuits for tracking 8 and 9 cause the lens holder 3 to rotate around the holder shaft 5 and slightly move in the radial direction of the recording surface 201 of the optical disc 200, and the position relative to the tracks forming the same. Matching is done.

The lens holder 3 and the device frame 4 are molded products made of a non-magnetic material such as synthetic resin. The holder shaft 5 may be a stainless steel shaft having a sliding surface plated.

Next, the structure of each part will be described in more detail. First, the shape of the lens holder 3 will be described with reference to FIG. The lens holder 3 of this example has a horizontally long octagonal outline shape as a whole. A through hole 31 through which the holder shaft 5 penetrates is formed in the center in the vertical direction, and a circular lens mounting hole 32 is formed at a position adjacent to the through hole 31. Below the lens mounting hole 32, a circular through hole 33 that forms an optical path of a light beam in a coaxial state is continuous.

Here, in the lens holder 3 of this example, the surface on the side where the lens mounting hole 32 is formed, that is,
As for the first surface 34 on the side of the disk mounting portion 120, the side on which the lens mounting hole 32 is formed is a protruding surface 34a that projects toward the side of the disk mounting portion 120, and the other side is a retreating surface 34b. The protruding surface 34a and the receding surface 34b are continuous by the inclined surface 34c. Thus, the first surface 34 is a stepped surface having the step h1.

Similarly, a second surface opposite the first surface 34
Similarly, the surface 35 of the device frame 4, that is, the surface of the device frame 4 on the side of the bottom plate 41 has a receding surface 35a that recedes toward the mounting portion 120 side and a projecting surface 35b that projects further toward the bottom plate 41 than this. The surface is a stepped surface having a step h2 provided, and these surfaces 35a and 35b are continuous by a curved surface 35c. The steps h1 and h2 on the first surface and the second surface are substantially the same. In this example, the protruding surface 34a of the first surface 34 is the center holder shaft through hole 3
It is formed beyond 1 to the other side. On the other hand, on the second surface, the receding surface 35a and the projecting surface 35b are formed.
Are formed on the left and right of the through hole 31.

As described above, since the upper and lower surfaces of the lens holder 3 are defined by the stepped first surface 34 and the stepped second surface 35, as a whole, FIG.
As shown in (G), the cross-sectional shape of the through hole 31 and the objective lens mounting hole 32 taken along a plane including the axis is such that the through hole 31 is sandwiched between the objective lens mounting side and the mounting portion 120 side. It has a cross-sectional shape with a step protruding and the other part receding from that.

Therefore, the end faces 36a and 36b located at both ends in the longitudinal direction of the lens holder 3 (direction passing through the centers of the through hole 31 and the lens mounting hole 32) are provided with a step h1. These end faces 36a and 36
Reference characters b are the mounting surfaces of the magnetic coils 81 and 91 which form the tracking magnetic drive circuits 8 and 9, respectively.

On the other hand, the side surfaces 36c and 36d located at both ends in the lateral direction (direction orthogonal to the longitudinal direction) of the lens holder 3 are at the same height position, and these surfaces have: A pair of mounting frames 361, 362 and 363, 364 extending in the vertical direction are formed on both sides. These surfaces are the magnetic drive circuit 6 for focusing,
7 is a mounting surface of the focusing magnetic coils 61 and 71 that form the No. 7.

Referring again to FIGS. 1, 2 and 3, the lens holder 3 having the above structure has the lens mounting hole 3
The objective lens 2 is attached to 1 and the holder shaft 5 is attached. The magnetic coil 8 attached to the end surfaces 36a and 36b of the lens holder 3 in the attached state
Magnets 82 and 92 for forming the magnetic drive circuits 8 and 9 for tracking are arranged at positions facing 1 and 92, respectively. These magnets 82 and 92 are mounted in mounting grooves 43 and 44 formed on the inner peripheral surface of the side wall 42 of the device frame 4 via yokes 83 and 93, respectively. Here, as described above, the magnetic coils 81, 9
Since No. 1 is attached to the end faces 36a and 36b having a height difference (step) h1, the magnets 82 and 9 facing each other are provided.
Similarly, 2 is attached to the side of the apparatus frame 4 with a height difference h1.

Similarly, the side surface 36c of the lens holder 3,
The magnetic drive circuits 6 and 7 for focusing are respectively provided at positions facing the magnetic coils 61 and 71 attached to 36d.
Magnets 62 and 72 for configuring the above are arranged. Here, the outer yokes 63, 73 are provided on the back side of the magnets 62, 72.
Is arranged. Further, inner yokes 64 and 74 are also arranged at the centers of the magnetic coils 61 and 71.

The apparatus frame 4 has a bottom plate 41 and a side wall 42 vertically provided around the bottom plate 41, and a holder shaft 5 is arranged at the center of a recess defined by these. The lens holder 3 is attached. The optical disk device 100 is provided on both sides of the device frame 4.
Is formed with guide bar through holes 47 and 48 through which guide bars (not shown) arranged on the main body side are inserted. Also in this apparatus frame 4, the upper end surface 49 of the outer wall 42 is located on the side where the objective lens 2 is located, in other words,
A portion of the optical disc case mounted on the disc mounting portion 120, which faces the case opening 211, is a protruding surface 49 a protruding toward the mounting portion 120. Case opening 21
The portion that does not enter 1 is a retreat surface 49b retreated by a constant step h3. This step h3 is substantially the same as the step h1 of the lens holder 3.

Next, the optical pickup device 1 of the present example is provided with a neutral position holding mechanism for returning the lens holder 3 to the preset origin position in the tracking direction and the focusing direction, that is, the neutral position. There is. This mechanism is composed of two sets of magnetic springs. Each magnetic spring is composed of a magnet and a magnetic piece that are arranged to face each other.

More specifically, as can be seen from FIG. 5, a shallow groove 36e extending in the lateral direction is formed on the mounting surfaces 36a, 36b of the tracking magnetic coil formed on the end faces of the lens holder 3 located at both ends in the longitudinal direction. 36
f is formed. These grooves serve as a mounting portion for each magnetic piece forming the magnetic spring. These grooves 36
As shown in FIG. 2, the first and second magnetic pieces (generally iron pieces) 12 and 1 in the shape of a flat rectangle are included in e and 36f.
3 is fitted and fixed. From above, magnetic coils 81 and 91 are attached.

The first magnetic piece 12 is located in the magnetic field of the magnet 82, these constitute a first magnetic spring, and the second magnetic piece 13 is located in the magnetic field of the magnet 92. A second magnetic spring is constituted by these. When the magnetic drive circuits 6, 7, 8 and 9 are in the non-excited state, the magnetic attraction force by these two sets of magnetic springs causes the lens holder 3 to move to a preset neutral position in each of the tracking direction and the focusing direction. Held in.

The optical pickup device 1 of the present example, in which each part is configured as described above, is attached to the optical disc device as shown in FIG. That is, the protruding surface 49a of the upper end surface 49 of the device frame 4 is attached so as to be in a state of protruding by a predetermined amount into the case opening 211 of the optical disc case mounted in the disc mounting portion 120. The holder shaft 5 and the lens holder 3 attached to the holder shaft 5 are incorporated in the portion of the apparatus frame 4 that protrudes into the case opening 211, and the protrusion surface 34a of the first surface, which is the upper end of these, is also included. It is in a state of being rushed into the case opening 211. Case opening 211
As described above, in the part of the optical pickup device 1 that is away from the above, the receding surface 49b is formed on the upper end of the device frame 4, and the receding surface 34b is also formed on the first surface of the upper end of the lens holder 3. There is. Therefore, the optical disc 20
Even if 0 is mounted on the disk mounting portion 120, these portions do not interfere with the case 210.

As described above, in this example, paying attention to the empty space (gap corresponding to the case thickness) in the portion where the case opening 211 is located in the disk mounting portion 120, the upper end side of the pickup device 1 is set in this portion. It is arranged so that a part of it is projected. As a result, the height (thickness) of the optical pickup device 1 is H1 as a whole as shown in FIG. 2, but the optical pickup device 1 is formed on the optical disc device 100 side by an amount corresponding to the protrusion to the case opening 211 side. It is possible to reduce the height H0 of the incorporated portion of the optical pickup device.

Further, in this example, since the lens holder 3 is provided with a step and the portion on the mounting side of the objective lens 2 is projected to the side of the disk mounting portion 120, a sufficient thickness of this portion should be secured. You can Therefore, the rigidity of the lens holder 3 can be made sufficient, and the adverse effect that the high-order resonance frequency is lowered and the high-order resonance is likely to occur during operation can be avoided.

Further, in this example, the magnetic drive circuit for focusing is formed in the portion protruding toward the disk mounting portion. Therefore, it is possible to make the magnetic coil and the magnet constituting this large. Since the magnetic drive circuit for focusing needs to move the lens holder 3 up and down against its own weight as in this example, a magnetic force larger than that of the magnetic drive circuit for tracking is required. , May require large magnetic coils, magnets. Even in such a case, the configuration of this example can be adopted.

Next, in the optical pickup device 1 of this example, the light is incident on the objective lens 2 by using the reflection mirror 11 arranged immediately below the objective lens 2. That is, as shown in FIG. 4, the reflection mirror 11 is arranged on the bottom plate 41 of the device frame 4 at an inclination angle of 45 degrees. Immediately above the mirror 11, a through hole 32 for an optical path formed in the lens holder 3 is located. A light introducing hole 42a is formed in the outer wall 42 of the device frame 4, and light emitted from an optical system arranged on the optical disk device 100 side is introduced through the light introducing hole 42a. The light L introduced from here in the horizontal direction is bent at a right angle by the reflection mirror 11, travels vertically upward, passes through the through hole 32 of the lens holder 3, and passes through the lens mounting hole 31 thereabove. Is incident on the objective lens 2 attached to the. The light incident on the objective lens 2 is focused on the recording surface 201 of the optical disc 200 via the light.

As described above, in this example, since the lens holder 3 is stepped, the retreating surface 35a of the second surface which is the lower surface of the lens mounting side and the bottom plate 41 of the apparatus frame 4 are formed. Focusing on the fact that a large gap can be taken, the reflection mirror 11 is arranged in this portion.
Since the reflection mirror 11 is arranged by utilizing the gap generated by forming the step, the height (thickness) of the optical pickup device 1 can be reduced.

(Other Embodiments) In the above description, the holder shaft is arranged vertically. However, the holder shaft is arranged horizontally or at an inclined position. The present invention can be similarly applied to the case where the lens holder is supported.

Further, in the above-mentioned example, the magnetic coils forming the tracking magnetic circuit are formed at both ends of the lens holder in the longitudinal direction having the step, and the tracking magnetic circuit is formed, and focusing is performed on both sides in the direction orthogonal to this. A magnetic circuit for use is constructed.

Needless to say, the present invention can be applied to the arrangement relationship opposite to this.

Further, the magnetic coil side may be arranged on the fixed side of the apparatus frame, and the magnet side may be arranged on the lens holder side.

The amount by which the upper end of the optical pickup device is projected toward the disc mounting portion is a property that should be appropriately set according to the configuration of each device. Similarly, the extent to which the range is projected depends on the size of the case opening and the like. Further, how much a step difference is formed in the lens holder is also a property that should be appropriately set according to the configuration of each device. In any case, the height (thickness) of the mounting portion of the optical pickup device can be reduced and the rigidity of the lens holder can be reduced by utilizing the empty space where the opening of the disc case is located on the side of the disc mounting portion. This is because it is possible to obtain a sufficient effect, and the problem of higher-order resonance can be avoided.

[0048]

As described above, according to the present invention, a part of the optical pickup device is arranged by utilizing the empty space where the opening of the optical disk case in the optical disk mounting portion facing it is located. ing. Therefore, it is possible to reduce the height (thickness) of the installation base of the optical pickup device, which is required on the side of the optical disk device in which this is incorporated. In addition, since the lens holder is stepped so that the part on the side where the objective lens is attached projects toward the case opening, the thickness of the lens holder can be ensured, so that its rigidity is sufficient. it can. Therefore, it is possible to avoid the adverse effect that high-order resonance is likely to occur.

Further, since the magnetic coil and the magnet, which are components of the focusing magnetic circuit requiring a large magnetic force, are arranged in the portion protruding toward the disk mounting portion, these can be arranged easily. be able to.

Further, since the reflecting mirror is arranged by utilizing the gap formed between the lens holder having the step and the bottom plate of the apparatus frame as described above, the height (thickness) of the apparatus is increased accordingly. Nor.

[Brief description of drawings]

FIG. 1 is a schematic plan view of an optical pickup device to which the present invention is applied.

2 is a schematic cross-sectional view of a portion of the device of FIG. 1 taken along line II-II.

3 is a schematic cross-sectional view of a portion of the device of FIG. 1 taken along the line III-III.

FIG. 4 is a schematic cross-sectional view illustrating a part cut along a line IV-IV of FIG. 1 with a part thereof omitted.

5 is a diagram showing only the lens holder of FIG. 1,
(A)-(G) is one side view, a top view, a back view, the other side view, one end view, the other end view, and sectional view, respectively.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Optical pickup device 2 Objective lens 3 Lens holder 34 1st surface (stepped surface) 34a 1st surface protruding surface 34b 1st surface receding surface 35 2nd surface (stepped surface) 35a 2nd Surface receding surface 35b Second surface protruding surface 36a, 36b End surface (tracking magnetic coil mounting surface) 36c, 36d Side surface (focusing magnetic coil mounting surface) 4 Device frame 49 Device frame upper end surface 49a Upper end surface Projecting surface 5 Holder shaft 5a Axis line of holder shaft 6,7 Focusing magnetic drive circuit 61,71 Magnetic coil 62,72 Magnet 8,9 Tracking magnetic drive circuit 81,91 Magnetic coil 82,92 Magnet 11 Reflecting mirror 120 Disk Mounting part 200 Optical disc 210 Disc case 211 Case opening

Claims (5)

[Claims] 1. An objective lens, a lens holder that holds the objective lens, and a lens holder that is arranged parallel to the optical axis direction of the objective lens and supports the lens holder so as to be movable in the axial direction and rotatable about the axis. Holder shaft,
In an optical pickup device having a device frame supporting the holder shaft and a magnetic drive mechanism for moving and rotating the lens holder, at least the lens holder is at least a part of a portion to which the objective lens is attached. However, the optical pickup device is arranged in a space in which a case opening of an optical disc mounted in the disc mounting portion on the optical disc device side is located. 2. The optical pickup device according to claim 1, wherein a part of the device frame is also arranged in a space where the case opening is located. 3. The lens holder according to claim 1, wherein the lens holder faces a side of the disc mounting portion, and has a first surface on which the objective lens is attached, and a first surface on a side opposite to the first surface. 2 surface, and the first surface is a step in which at least a surface portion of the side on which the objective lens is attached with respect to the holder shaft is a protrusion surface that protrudes toward the disc mounting portion side. Attached surface,
The optical pickup device is characterized in that the protruding surface is located in a space where the case opening is located. 4. The second surface of the lens holder according to claim 3, wherein a surface portion of the first surface on a side corresponding to the projecting surface is a receding surface receding toward the disc mounting portion side. A reflecting mirror that directs incident light in the optical axis direction of the objective lens is disposed between the receding surface and a portion of the device frame facing the receding surface. An optical pickup device characterized by: 5. The magnetic drive mechanism according to claim 3, wherein the magnetic drive mechanism includes a tracking magnetic drive circuit that rotates the lens holder around the holder shaft, and a focusing magnetic drive circuit that moves the lens holder along the holder shaft. The tracking magnetic drive circuit includes a magnetic coil attached to a position on a straight line passing through the objective lens and the holder axis on the outer peripheral surface of the lens holder, and the device for facing the magnetic coil. The focusing magnetic drive circuit includes a magnet supported by a frame, and the focusing magnetic drive circuit is mounted on an outer peripheral surface of the lens holder orthogonal to the magnetic coils of the tracking magnetic circuit, and faces the magnetic coils. And a magnet supported by the device frame, One magnetic coil forming the tracking magnetic drive circuit and two magnetic coils forming the focusing magnetic drive circuit are provided on the outer peripheral side surface of the lens holder on the side where the protruding surface of the first surface is formed. An optical pickup device characterized by being attached.