JPH09190632A - Supporting mechanism of optical head device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a supporting mechanism of optical head device capable of obtaining high twisting rigidity in each movable direction in a simple constitution without using another member. SOLUTION: Supporting members 32a, 32b are provided as a pair on both sides 17a, 17b of an objective lens supporting body 14. On these members 32a, 32b, long and narrow connection plate parts 34a, 34b constituting planar connection parts, a pair of side leg plate parts 33a, 33b extendedly provided in the same right angle direction each other while connecting to both end parts of these connection plate parts 34a, 34b with the same plane thickness, and center leg plate parts 35a, 36a, and 35b, 36b respectively clossing at right angles and extendedly provided in the same direction as that of the side leg plate parts 33a, 33b while connecting to nearly center parts of the connection plate parts 34a, 34b with the same plane thickness, are integrally formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a support mechanism of an optical head device for movably supporting an objective lens with respect to an optical disk.

[0002]

2. Description of the Related Art As is well known, in a system for recording and reproducing information using an optical disk as a recording medium, such as a write-once type optical disk drive device, the optical disk is irradiated with laser light. Optical head device. This optical head device is arranged so as to face the signal recording surface of a rotationally driven optical disc, and records information by irradiating the optical disc with laser light or receives reflected light from the optical disc. Reading information.

Here, this optical head device is provided with an actuator section for driving the objective lens in the focus direction or the tracking direction with respect to the optical disk surface by an electromagnetic driving force. As a result, the laser light generated from the semiconductor laser element built in the optical head device accurately scans the recording track of the signal recording surface of the optical disc.

FIG. 5 shows an optical head device having an actuator section for driving such an objective lens. That is, reference numeral 11 in the figure is a frame formed in a substantially U-shape, and is arranged in a chassis or the like (not shown) so that its opening side faces the signal recording surface of the optical disc (not shown). Both sides 11a and 11b of the frame 11
Magnets 12a and 12b are attached to the. Further, yokes 13a and 13b facing the magnets 12a and 12b and forming magnetic closed paths with the magnets 12a and 12b are provided on the bottom surface of the frame 11. The objective lens support 14 is arranged between the yokes 13a and 13b. This objective lens support 1
An objective lens 14a for exposing and receiving laser light to the optical disk is exposed at 4.

A focus actuator coil 15 surrounds the objective lens support 14. The focus actuator coil 15 has tracking actuator coils 16a, 16 on both side surfaces facing the magnets 12a, 12b.
b and are installed. These focus actuator coil 15 and tracking actuator coil 1
6a and 16b are interposed in the magnetic paths formed by the magnets 12a and 12b and the yokes 13a and 13b, respectively.

Therefore, the focus actuator coil 15 and the tracking actuator coil 16a,
By energizing 16b, the objective lens support 1
4 is moved in the focus direction (direction shown by arrow Z1-Z2 in the figure) which is a direction perpendicular to the signal recording surface of the optical disc and in the tracking direction (direction shown by arrow X1-X2 in the diagram) which is a radial direction of the optical disc. Can be made.

Here, the objective lens support 14 has the joint portions 17a, 1 provided at both ends thereof in the tracking direction.
7b is attached to a block 19 fixed to a chassis or the like via elastic supporting portions 18a and 18b, respectively, so that it is movably supported in the focus direction and the tracking direction.

The elastic supporting portions 18a and 18b are formed of, for example, thin plate members, and the bosses 20 and 2 are provided at both ends of the block 19 corresponding to the tracking direction.
0, 20, 20 (boss 20, 20 at one end in the figure)
(Only shown) and then heat welded. The elastic support portion 18a is attached to the right end portion of the block 19 in the figure with a predetermined first width, and is tracked from the block 19 to a second width narrower than the first width. The spring portion 18a1 is extended. The tracking spring portion 18a1 is formed in a substantially U shape with its free end having a third width wider than the second width, and its opening side faces in the direction indicated by the arrow Y in the figure. .

At the free end of the tracking spring portion 18a1, the first pair of focus spring portions 18a2 and 18a2, which are the both ends thereof, are bent substantially at right angles in the direction indicated by the arrow X1 in the figure. The surfaces of the first pair of arms 18a2, 18a2 facing each other correspond to the focus direction, and are formed to have flexibility with respect to the tracking spring portion 18a1. That is, the first pair of focus spring portions 18a2 and 18a2 are formed such that both end portions corresponding to the tracking direction are thin. Also, the tracking spring portion 18a
1 is formed so that both ends corresponding to the focus direction are thin.

Therefore, the tracking spring portion 18a1
Can move in parallel to the block 19 in the tracking direction. In addition, the first pair of focus spring portions 18a2 and 18a2 includes the tracking spring portion 18a1.
It is possible to move parallel to the focus direction.

Further, the first pair of focus spring portions 18
The free ends of the a2 and 18a2 are connected at their ends corresponding to the tracking direction by an integrally formed connecting portion 18a3.

On the other hand, the elastic support portion 18b is attached to the left end portion of the block 19 in the drawing with a predetermined first width, and is attached from the block 19 to a second width narrower than the first width.
The tracking spring portion 18b1 that is narrowed to the width is extended. The tracking spring portion 18b1 is formed in a substantially U-shape with its free end having a third width wider than the second width, and its opening side faces in the direction indicated by the arrow Y in the figure. .

At the free end of the tracking spring portion 18b1, the second pair of focus spring portions 18b2 and 18b2, which are the both ends thereof, are bent at a substantially right angle in the direction indicated by the arrow X2 in the figure. The surfaces of the second pair of focus spring portions 18b2 and 18b2 facing each other correspond to the focus direction, and the tracking spring portion 1
It is formed to have flexibility with respect to 8b1.
That is, the second pair of focus spring portions 18b2, 18
The b2 is formed such that both ends thereof corresponding to the tracking direction are thin. Further, the tracking spring portion 18b1 is formed such that both end portions corresponding to the focus direction are thin.

Therefore, the tracking spring portion 18b1
Can move in parallel to the block 19 in the tracking direction. In addition, the second pair of focus spring portions 18b2 and 18b2 include the tracking spring portion 18b1.
It is possible to move parallel to the focus direction.

Further, the second pair of focus spring portions 18
The free ends of b2 and 18b2 are connected at their ends corresponding to the tracking direction by an integrally formed connecting portion 18b3.

At the central portions of the connecting portions 18a3 and 18b3, substantially quadrangular supporting portions 18a4 and 18b4 are integrally formed so as to protrude toward the block 19. These supporting portions 18a4 and 18b4 are formed so that the tracking spring portions 18a5 and 18b5, which are the connecting portions with the connecting portions 18a3 and 18b3, respectively, have flexibility. That is, the tracking spring portion 18
The widths of a5 and 18b5 are narrowed to the connecting portions 18a3 and 18b3 and the supporting portions 18a4 and 18b4. In addition, the tracking spring portions 18a5 and 18b5 are
Both ends corresponding to the focus direction are formed to be thin. Therefore, the support portions 18a4, 18b
4 is movable in parallel in the tracking direction with respect to the connecting portions 18a3 and 18b3.

Then, these supporting portions 18a4, 18b4
Fitting holes 18a6, 18a6 and 1 respectively formed in
By fitting the fitting pins 21a, 21a and 21b, 21b (only the fitting pins 21a, 21a on one side are shown in the figure) projecting from the joint portions 17a, 17b to 8b6, 18b6, The lens support 14 is the elastic support portion 1.
It is supported by 8a and 18b. Therefore, the objective lens support 14 is movable in the tracking direction due to the flexibility of the tracking spring portions 18a5 and 18b5 while being supported by the elastic support portions 18a and 18b.

The objective lens support 14 is supported by the elastic support portions 18a and 18b, and the first and second focus spring portions 18a2, 18a2 and 18b2, 1 are provided.
Since 8b2 constitutes a link mechanism, it is movable in the focus direction.

In short, with the objective lens support 14 supported by the elastic support portions 18a and 18b mounted on the frame 11, the objective lens support 14 is movable in the focus direction and the tracking direction. By energizing the focus actuator coil 15 and the tracking actuator coils 16a and 16b, the objective lens 14a can be controlled in the focus direction and the tracking direction. In the normal state, the objective lens support body 14 has the elastic support portions 18a,
By the elastic force of each focus spring portion 18a2, 18b2 and tracking spring portion 18a5, 18b5 of 18b,
It is stabilized at the approximate center of the moving range.

Here, the focus spring portions 18a2,
18b2 and tracking spring portions 18a1, 18b1,
The state of bending in the focus direction and the tracking direction in 18a5 and 18b5 will be described.

FIG. 6 shows, for example, the focus spring portion 18a2.
It shows the state of the bending of. That is, when the objective lens support 14 moves in the focus direction (the direction indicated by arrow Z1 in the drawing) in the state shown in FIG. 6A, the focus spring portion 18a2 becomes as shown in FIG. It is bent in the focus direction, that is, in the direction indicated by arrow Z1 in the figure. At this time, the focus spring portion 18a2 has two action points A and B substantially in the center thereof, and the forces generated from the two action points A and B are different from each other in the out-of-plane directions (indicated by arrows F1 and F2 in the figure). Direction). Therefore, the focus spring portion 18a2 is
By bending the two action points A and B in different directions, the objective lens support 14 can be moved in the focus direction (the direction indicated by arrows Z1-Z2 in the drawing).

The tracking spring portions 18a1, 18a
Also at a4, it is bent like the focus spring portion 18a2. By the way, in the conventional optical head device configured as described above, the optical axes of the elastic support portions 18a and 18b are not easily tilted with respect to the signal recording surface of the optical disc in order to realize highly accurate recording / reproducing operation. That is, it is required to form the support member with high torsional rigidity. Here, for example, in the case of a compact disc, the tilt allowable value is about 5 mmrad.

However, in the conventional support measures applied to the optical head device as described above, the elastic support portions 18a, 18a, 1b are provided.
The objective lens support 14 is movably supported in the focus direction and the tracking direction by the free ends of the tracking spring portions 18a1 and 18b1 extending from the block 19 of 8b. And the elastic support portions 18a, 18b are displaced from the support centers of the arms 18a2, 18b2 and the support portion 18
The unnecessary force from a4 and 18b4 is the tracking spring part 1.
8a1 and 18b1. For this reason, the tracking spring portions 18a1 and 18b1 are twisted around the direction indicated by the arrow Y in the figure, which causes a problem that the optical axis of the objective lens support 14 is tilted.

[0024]

As described above, in the conventional support mechanism of the optical head device, the free end of the tracking spring portion of the elastic support portion enables the objective lens support to move in the focus direction and the tracking direction. Since the structure is supported, there is a problem that the tracking spring part extended from the fixed block is twisted and the optical axis is tilted due to the displacement between the center of gravity of the objective lens support and the support center of the elastic support part. . An object of the present invention is to provide a support mechanism for an optical head device that can obtain high torsional rigidity in each movable direction with a simple structure without using a separate member.

[0025]

A support mechanism for an optical head device according to the present invention is provided on a chassis and supports a frame for supporting a plurality of magnets, an objective lens support for supporting an objective lens, and an objective lens support. Provided on the drive coil, which is placed on the body and drives the objective lens support in the focus direction and the tracking direction with respect to the optical disc by the magnetic field given by the plurality of magnets supported by the frame, and on the fixed portion fixed on the chassis. And a support member that supports the objective lens support so that the objective lens can move in the focus direction and the tracking direction with respect to the optical disc and that is formed of a thin plate having a predetermined rigidity. It is intended for optical head devices.

The supporting members are provided in a pair on both sides of the objective lens support, and have elongated connecting plate portions that form a flat plate-like connecting portion, and both end portions of the connecting plate portions, respectively. A pair of side leg plates that are connected to each other with the same thickness in a plane and extend in the same orthogonal direction to each other and a substantially central portion of the connecting plate are connected to each other with the same thickness in a plane and extend in the same direction as the orthogonal side leg plates. The existing central leg plate portion is integrally formed, and the pair of side leg plate portions extend so as to face each other along the longitudinal direction by bending the connecting plate portions, respectively, and , The free ends of which are parallel to each other and are planted in the fixed part, the central leg plate part is shorter than the pair of side leg plate parts, and the objective lens support is attached to the free end. It was done.

According to this structure, a high torsional rigidity can be obtained in each movable direction of the pair of side leg plates and the central leg plate supporting the objective lens support. Further, since the supporting member made of a thin plate body is simply bent to form the side leg plate portion and the central leg plate portion, it is not necessary to use a separate member, and the side leg plate portion and the central leg plate portion are not required. A high torsional rigidity can be obtained in each movable direction.

[0028]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention. In FIG. 1, the same parts as those in FIG. That is, reference numeral 31 in the drawing is a fixed part, and the first pair of focus spring parts 33a, 33a which are the side leg plate parts forming the elastic support part 32a are attached to the right end part in the drawing. After the first pair of focus spring portions 33a, 33a are extended from the fixed portion 31 in the same direction at a predetermined interval, their free ends are integrally formed at the end portions on the direction side indicated by the arrow X2 in the figure. They are connected by a connecting portion 34a which is a connecting plate portion formed in a specific manner. The first pair of focus spring portions 33 a, 33 a are formed so as to have flexibility with respect to the fixed portion 31. That is, the first pair of focus spring portions 33a, 33a are formed such that both end portions corresponding to the tracking direction (the direction indicated by the arrow X1-X2 in the drawing) are thin. Therefore, the first pair of focus spring portions 33a, 33a are
Focus direction (direction indicated by arrows Z1-Z2 in the figure)
It is possible to move in parallel to. The bending of the first pair of focus spring portions 33a, 33a at this time is the same as in the conventional case (details are shown in FIG. 6).

On the other hand, at the left end of the fixing portion 31 in the drawing,
A second pair of focus spring portions 33b, 33b forming the elastic support portion 32b are attached. These second
The pair of focus spring parts 33b, 33b of the
After extending from 1 in the same direction at a predetermined interval, the end portions of the respective free ends on the direction side indicated by the arrow X1 in the figure,
They are connected by the integrally formed connecting portion 34b. In addition, the second pair of focus spring portions 33
b and 33b are formed so as to have flexibility with respect to the fixed portion 31. That is, the second pair of focus spring portions 33b and 33b are formed such that both end portions corresponding to the tracking direction are thin.
Therefore, the second pair of focus spring portions 33b, 33
b is movable in parallel with the fixed portion 31 in the focus direction.

At the central portions of the connecting portions 34a, 34b, substantially rectangular support portions 35a, 35b forming central leg plate portions are integrally formed in a protruding manner toward the fixing portion 31, respectively. These supporting portions 35a, 35b
Are formed so that the tracking spring portions 36a and 36b, which are the connecting portions with the connecting portions 34a and 34b, respectively, have flexibility. That is, the tracking spring portion 36
The widths of a and 36b are the same as those of the connecting portions 34a and 34b and the supporting portion 3.
It is narrowed to 5a and 35b. Further, the tracking spring portions 36a and 36b are formed so that both ends thereof corresponding to the focus direction are thin.
Therefore, the supporting portions 35a and 35b are connected to the connecting portions 34a and 3b.
4b can be moved in parallel in the tracking direction.

Then, in the fitting holes 37a, 37a and 37b, 37b formed in these supporting portions 35a, 35b,
By fitting the fitting pins 21a, 21a and 21b, 21b (only the fitting pins 21a, 21a on one side are shown in the figure) protruding from the joint portions 17a, 17b of the objective lens support 14, The objective lens support 14 is the support portion 35.
It is supported by a and 35b. Therefore, the objective lens support 14 is movable in the tracking direction by the flexibility of the tracking spring portions 36a and 36b while being supported by the support portions 35a and 35b.

The objective lens support 14 is supported by the support portions 35a and 35b of the elastic support portions 32a and 32b, and the first and second focus spring portions 33a and 33.
Since a, 33b, and 33b form a link mechanism, they can be moved in the focus direction.

FIG. 2 shows the elastic support portion 32a shown in FIG.
It shows a state in which 32b is expanded. That is, for example, the elastic support portion 32a is formed of a thin plate body such as stainless steel in a substantially E shape, and is arranged so that the opening side thereof faces the fixed portion 31. The elastic support portion 32a is bent at a substantially right angle so that the focus spring portions 33a, 33a, which are the both ends thereof, face each other from the positions shown by the dotted lines in the figure. Then, in the elastic supporting portion 32a, the free ends of the focus spring portions 33a, 33a are planted again at the right end portion in FIG. 1 of the fixing portion 31 shown in FIG.

Therefore, the elastic support portion 32a is fixed to the fixed portion 3
1 is attached while maintaining a substantially U-shape, the torsional rigidity around the direction indicated by the arrow Y in FIG. 1 is increased. Further, the connecting portion 34a of the elastic support portion 32a
The tracking spring portion 36a extending from the central portion of the arrow toward the fixed portion 31 has a tracking direction, that is, an arrow X in FIG.
Since the twist around the direction indicated by 1-X2 is received in the in-plane displacement direction, the torsional rigidity becomes high.

Further, the elastic support portions 32a and 32b of the plate body are bent respectively to form the first and second focus spring portions 33.
a and 33b and the tracking spring portions 36a and 36b are simply formed, there is no need to use a separate member, and the first and second focus spring portions 33a and 3b are not necessary.
High torsional rigidity can be obtained in the respective moving directions of 3b and the tracking spring portions 36a and 36b.

FIG. 3 shows a second embodiment of the present invention. In FIG. 3, reference numeral 41 in the drawing is a fixed part, and a first pair of focus spring parts 43a, 43a forming an elastic support part 42 is attached to the right end part in the drawing. The first pair of focus spring portions 43a, 43a are
After being extended from the fixed portion 41 in the same direction at a predetermined interval, the free ends of the respective free ends on the direction side indicated by the arrow X2 in the figure are connected by an integrally formed connecting portion 44a. Further, the first pair of focus spring portions 43 a, 43 a are formed so as to have flexibility with respect to the fixed portion 41. That is, the first pair of focus spring portions 43a, 43a are formed such that both ends corresponding to the tracking direction (the direction indicated by the arrow X1-X2 in the drawing) are thin. Therefore, the first pair of focus spring portions 43a, 43a are
Focus direction (direction indicated by arrows Z1-Z2 in the figure)
It is possible to move in parallel to. The bending of the first pair of focus spring portions 43a, 43a at this time is the same as in the conventional case (details are shown in FIG. 6).

On the other hand, at the left end of the fixing portion 41 in the drawing,
The second pair of focus spring portions 43b, 43b are attached. These second pair of focus spring parts 4
3b and 43b are extended from the fixed portion 41 in the same direction at a predetermined interval, and then are indicated by arrows X in the figure at their free ends.
The end on the direction side indicated by 1 is a connecting portion 4 formed integrally.
They are connected by 4b. The second pair of focus spring portions 43b, 43b are formed so as to have flexibility with respect to the fixed portion 41. That is, the second pair of focus spring portions 43b, 43b
Are formed so that both ends corresponding to the tracking direction are thin. For this reason, the second pair of focus spring portions 43b, 43b can be moved in parallel to the fixed portion 41 in the focus direction.

At the central portions of the connecting portions 44a and 44b, substantially quadrangular supporting portions 45a and 45b are integrally formed so as to protrude toward the fixing portion 41, respectively. These supporting portions 45a and 45b are respectively connected to the connecting portion 4
Tracking spring portion 4 which is a connecting portion with 4a and 44b
6a and 46b are formed to have flexibility.
That is, the widths of the tracking spring portions 46a and 46b are narrowed with respect to the connecting portions 44a and 44b and the supporting portions 45a and 45b. In addition, the tracking spring portion 46
The a and 46b are formed so that both ends corresponding to the focus direction are thin. Therefore, the support portion 4
5a and 45b are movable in parallel in the tracking direction with respect to the connecting portions 44a and 44b.

Then, in the fitting holes 47a, 47a and 47b, 47b formed in these supporting portions 45a, 45b,
The joint portions 17a, 1 of the objective lens support 14 shown in FIG.
Fitting pins 21a, 21a and 21b projectingly provided on 7b,
21b (only the fitting pins 21a, 21a on one side are shown in FIG. 1) are fitted to the objective lens support 1
4 is supported by the support portions 45a and 45b. Therefore, the objective lens support 14 is movable in the tracking direction by the flexibility of the tracking spring portions 46a and 46b while being supported by the support portions 45a and 45b.

The objective lens support 14 is supported by the support portions 45a and 45b of the elastic support portion 42, and the first and second focus spring portions 43a, 43a and 43.
Since b and 43b form a link mechanism, they can be moved in the focus direction.

The connecting portions 44a and 44b are connected to each other by a connecting portion 48 having integrally formed end portions on the side indicated by the arrow Y in the figure. For this reason, the elastic support portion 42 has a higher torsional rigidity around the fixing portion 41 in the direction indicated by the arrow Y in the figure.

As shown in FIG. 4, the elastic supporting portion 42 has both ends of the connecting portion 48 formed in a substantially E shape, and the opening sides thereof face outward. Further, the width of the connecting portion 48 is narrowed with respect to the connecting portions 34a and 34b on both end sides.

First, the elastic support portion 42 is bent at a substantially right angle so that the connecting portions 44a and 44b, which are both end portions thereof, face each other. Then, the first pair of focus spring portions 43a, 43a connected to both ends of the one connecting portion 44a.
Are bent at a substantially right angle so as to face each other. Also,
The second pair of focus spring portions 43b, 43b connected to both ends of the other connecting portion 44b are bent at a substantially right angle so as to face each other. After that, the elastic support portion 42 is formed as shown in FIG.
As shown in FIG.
a, 43a and the second pair of focus spring portions 43b,
Each free end of 43b will be planted in the both ends of the fixed part 41.

Therefore, according to the second embodiment, by connecting the connecting portions 44a and 44b to each other by the connecting portion 48, the torsional rigidity around the direction indicated by the arrow Y in the drawing can be improved. It can be made higher than the form.

As described above, according to each embodiment, since the torsional rigidity is high in the movable direction of the objective lens support 14, it is used for recording / reproducing of a disk which requires a high recording density. It becomes possible.

[0046]

As described in detail above, according to the present invention,
It is possible to provide a support mechanism for an optical head device that can obtain high torsional rigidity in each movable direction with a simple configuration without using a separate member.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a support mechanism of an optical head device according to the present invention.

FIG. 2 is a development view showing a specific configuration of an elastic support portion according to the same embodiment.

FIG. 3 is a perspective view showing a second embodiment of the present invention.

FIG. 4 is a development view showing a specific configuration of an elastic support portion according to the second embodiment.

FIG. 5 is a perspective view showing a support mechanism of a conventional optical head device.

FIG. 6 is a view for explaining details of flexibility of an elastic support portion in the conventional device.

[Explanation of symbols]

 11 ... Frame, 12a ... Magnet, 12b ... Magnet, 13a ... Yoke, 13b ... Yoke, 14 ... Objective lens support, 14a ... Objective lens, 15 ... Focus actuator coil, 16a ... Tracking actuator coil, 16b ... Tracking actuator coil, 17a ... Joining part, 17b ... Joining part, 31 ... Fixing part, 32a ... Elastic supporting part, 32b ... Elastic supporting part, 33a ... First focus spring part, 33b ... Second focus spring part, 34a ... Connecting part, 34b ... Connection part, 35a ... Support part, 35b ... Support part, 36a ... Tracking spring part, 36b ... Tracking spring part, 37a ... Fitting hole, 37b ... Fitting hole, 41 ... Fixing part, 42 ... Elastic support part, 43a ... 1st focus spring part, 43b ... 2nd focus spring part, 44a Connecting portion, 44b ... connecting portion, 45a ... supporting portion, 45b ... support portion, 46a ... tracking spring portion, 46b ... tracking spring portion, 47a ... fitting hole, 47b ... engagement hole, 48 ... connecting portion.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuo Kokubun 8 Shinsita-cho, Isogo-ku, Yokohama, Kanagawa Prefecture Multimedia Technology Research Laboratories, Toshiba Corp. (72) Hideaki Karahara 3-3-9 Shinbashi, Minato-ku, Tokyo No. Within Toshiba Abu E Co., Ltd.

Claims (3)

[Claims] 1. A frame provided on a chassis for supporting a plurality of magnets, an objective lens support for supporting an objective lens, and a plurality of the magnets arranged on the objective lens support and supported by the frame. A driving coil for driving the objective lens support with respect to the optical disk in a focus direction and a tracking direction by a magnetic field applied from the optical disc; and a fixed portion fixed on the chassis, the objective lens support being an objective lens. An optical head device comprising: a support member formed of a thin plate having a predetermined rigidity, the support member supporting the optical disc so as to be movable in a focus direction and a tracking direction, respectively. Are provided in a pair on both sides of the objective lens support, and form a flat plate-like connecting portion. A long and narrow connecting plate part, and a pair of side leg plate parts that are connected to both ends of the connecting plate part with the same thickness in a plane and extend in the same orthogonal direction to each other, and in a substantially central part of the connecting plate part. , The plane leg portions are connected to each other with the same thickness in a plane, and are integrally formed with the side leg plate portions and the central leg plate portion extending in the same direction as the side leg plate portions. By doing so, they extend so as to face each other along the longitudinal direction, and further, the respective free ends are planted in the fixed portion in a state of maintaining parallel to each other, and the central leg plate portion Is a shorter than the pair of side leg plates, and the objective lens support is attached to a free end of the pair of side leg plates. 2. The bending direction of the pair of side leg plate portions of the support member is made to coincide with the focus direction of the optical disc, and the bending direction of the central leg plate portion of the support member is made to coincide with the tracking direction of the optical disc. The support mechanism for an optical head device according to claim 1, wherein: 3. The support mechanism for an optical head device according to claim 1, wherein the support member connects the connecting plate portion on one side and the connecting plate portion on the other side with a plate body.