JP3111798U - Optical pickup device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical pickup device which can be expected to greatly reduce the cost.
A main chassis in which an optical disk is stored, and one end of the main chassis so as to move toward / separate from a recording surface of the optical disk stored in the main chassis.
The drive chassis 1 is mounted with an optical head that is supported so as to be rotatable about a support shaft in the vicinity of c and reciprocates in the radial direction along the recording surface of the optical disc in the closest state, and is supported by the main chassis and rotated. And a slide cam 20 having a cam groove 21 that slides and moves in parallel with the movement support shaft. The drive chassis 1 is a sheet metal molded product made of a metal plate, and the other end 1d.
The drive chassis 1 includes a projecting piece 3 having a U-shaped cross section that is bent so that both sides stand up.
And is integrally molded. The projecting piece 3 engages with the cam groove 21 of the slide cam 20 and is guided along the cam groove 21 as the slide cam 20 slides, whereby the drive chassis 1 rotates.
[Selection] Figure 3

Description

The present invention relates to an optical pickup device for reproducing and recording information on an optical disc such as a CD or DVD as an information recording medium.

A general optical pickup device is roughly composed of a main chassis and a drive chassis. The main chassis is a molded product of synthetic resin such as polystyrene (PS), for example, and a disk tray is supported on the main chassis so that it can be inserted and removed from the front to the inside. Then, an optical disk is placed on the disk tray pulled out of the main chassis, and the disk tray is fed into the main chassis,
An optical disk is stored in the main chassis.

Next, the configuration of the conventional drive chassis will be described with reference to FIG. FIG.
FIG. 3 is a perspective view of a conventional drive chassis as viewed from the lower surface side.

As shown in FIG. 4, the conventional drive chassis 101 is a molded product of synthetic resin such as polyphenylene ether (PPE), for example, and both left and right side surfaces 101a, 10a near the one end 101c.
1b includes support shafts 102A and 102B that protrude coaxially with each other.
And is formed by integral molding. Each of these support shafts 102A and 102B is rotatably supported by the main chassis. Then, the drive chassis 101 moves relative to the recording surface of the optical disk inserted in the main chassis by rotating about the support shafts 102A and 102B with respect to the main chassis, and is in the closest state. The optical disk is accommodated.

The rotation of the drive chassis 101 here is performed by a cylindrical protruding shaft portion 103 integrally formed with the other end 101 d of the drive chassis 101. Specifically, a slide cam having a cam groove on the outside of the other end 101d of the drive chassis 101 in the main chassis is supported so as to be slidable parallel to the respective support shafts 102A and 102B serving as the rotation center of the drive chassis 101. The projecting shaft portion 103 is engaged with the cam groove of the slide cam. As the slide cam slides, the projecting shaft portion 103 is guided along the cam groove, whereby the drive chassis 101 rotates. An auxiliary protruding shaft portion 104 is formed near the pin 103 at an interval. The auxiliary protruding shaft portion 104 engages with a guide groove formed in the main chassis, and rotates the drive chassis 101. This is to make the movement smooth.

Further, the drive chassis 101 is equipped with an optical head 10 for reading information recorded on the recording surface of the optical disc and writing information on the recording surface.
This optical head 10 is mainly composed of a light source such as a semiconductor laser that emits laser light, a photodiode that finally receives and detects reflected light from an optical disk based on the laser light from the light source, and converts it into an electrical signal. A photodetector, a diffraction grating that guides laser light from the light source to the photodetector through reflection of the optical disc, an optical system such as a half mirror and an objective lens, and a base member 11 to which these components are attached.

The base member 11 is supported with respect to the drive chassis 101 by a guide rail 105 and a guide shaft 106 that extend in the radial direction along the recording surface of the optical disc, and can reciprocate in the radial direction. That is, the entire optical head 10 is supported by the drive chassis 101 and reciprocates in the radial direction along the recording surface of the optical disk. This reciprocating movement of the optical head 10 is performed by a driving force from an electric motor mounted on the drive chassis 101. Specifically, the driven gear is engaged with the slide rack 12 attached to the side of the optical head 10, that is, the base member 11, and the output of the electric motor is transmitted to the driven gear. The driving force from the electric motor is also used for the rotation of the drive chassis 101, that is, the sliding movement of the slide cam and the insertion / removal movement of the disk tray.

The drive chassis 101 is mounted with a chucking plate that chucks the vicinity of the center of the optical disk and a spindle motor that applies a rotational force to the chucking plate in order to rotate the stored optical disk.

By the way, in recent optical pickup devices, further cost reduction is required,
As a conventional improvement technique for such a requirement, a synthetic resin molded product drive chassis 10 is provided.
Instead of 1, there is one that employs a drive chassis of a sheet metal molded product (for example, Patent Document 1).
reference). This is because, in general, a sheet metal molded product obtained by pressing or the like is less expensive than a synthetic resin molded product obtained by injection molding or the like, so that the cost reduction of the optical pickup device can be expected.
JP 2004-259377 A

However, in the above-described conventional improved technology, the drive chassis is merely replaced with a sheet metal molded product. Therefore, the drive chassis that engages with the cam groove of the slide cam used for rotation of the drive chassis, in particular. The projecting shaft from was procured as a separate part and had to be attached to the drive chassis separately. For this reason, the number of parts is substantially increased, and the mounting work is also added, so that the cost reduction effect of replacing the drive chassis from the synthetic resin molded product to the sheet metal molded product has been diminished.

Accordingly, the present invention has been made in view of the above-described problems, and an object thereof is to provide an optical pickup device that can be expected to greatly reduce the cost.

In order to achieve the above object, the present invention provides a main chassis of a synthetic resin molded product in which an optical disk is accommodated and a recording surface of the optical disk accommodated in the main chassis.
A drive chassis equipped with an optical head that is supported by the main chassis so as to move apart about a support shaft near one end and reciprocates in the radial direction along the recording surface of the optical disk in the closest state And a slide cam having a cam groove that is supported by the main chassis and slides parallel to the support shaft, and an optical pickup device comprising:
The drive chassis is a synthetic resin molded product, and at the other end, a cylindrical protruding shaft portion is integrally formed with the drive chassis, and the protruding shaft portion engages with a cam groove of the slide cam, By being guided along the cam groove according to the slide movement of the slide cam,
The optical pickup device in which the drive chassis rotates is characterized by the following points.

Instead of the drive chassis of the synthetic resin molded product, the drive chassis is a sheet metal molded product made of a steel plate, and the other end has a U-shaped projecting piece bent so that both sides stand upright. And is integrally molded. The projecting piece engages with the cam groove of the slide cam, and is guided along the cam groove as the slide cam slides, whereby the drive chassis rotates.

With this configuration, the drive chassis is an inexpensive sheet metal molded product, and the projecting piece from the drive chassis that engages with the cam groove of the slide cam used to rotate the drive chassis is the drive chassis. Therefore, cost reduction can be greatly expected.

In order to achieve the above object, the present invention includes a main chassis in which an optical disk is stored,
The main chassis is rotatably supported about a support shaft near one end so as to move toward and away from the recording surface of the optical disk stored in the main chassis, and the optical disk is in the closest state. An optical pickup apparatus comprising: a drive chassis having an optical head that reciprocally moves in a radial direction along the recording surface; and a slide cam that is supported by the main chassis and has a cam groove that slides parallel to the support shaft. Is characterized by the following points. The drive chassis is a sheet metal molded product made of a metal plate, and the other end is integrally formed with the drive chassis with a U-shaped projecting piece bent so that both sides stand up. The projecting piece engages with the cam groove of the slide cam, and is guided along the cam groove as the slide cam slides, whereby the drive chassis rotates.

Even in such a configuration, the drive chassis is an inexpensive sheet metal molded product, and the projecting piece from the drive chassis that engages with the cam groove of the slide cam used to rotate the drive chassis is Because it is molded integrally with the chassis, significant cost reduction can be expected.

Here, in view of practicality, the drive chassis is preferably made of a steel plate.
The main chassis is preferably a synthetic resin molded product.

According to the optical pickup device of the present invention, of course, in comparison with the conventional optical pickup device employing a synthetic resin molded drive chassis, the conventional improved technology employing a sheet metal molded drive chassis. Compared with this optical pickup device, an increase in the number of parts can be suppressed, and a great reduction in cost can be expected.

Hereinafter, an embodiment of an optical pickup device of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of a drive chassis of an optical pickup device according to an embodiment of the present invention as viewed from the top side, FIG. 2 is a schematic top view of the optical pickup device seen through the main chassis, and FIG. It is the schematic front view which saw through the main chassis in. In particular, FIGS. 2 (a) and 3 (a) both show the drive chassis lowered.
2B and 3B both show a state where the drive chassis is raised, that is, a state where the drive chassis is rotated and is closest to the optical disk. In these drawings, parts having the same names and functions that are the same as those in FIG.

The drive chassis 1 in the present embodiment is a sheet metal molded product formed by pressing or the like from a steel plate having a thickness of about 1 mm to 1.5 mm. However, the material is not limited to a steel plate, and a metal plate such as an alloy steel plate capable of sheet metal forming may be applied. The left and right side surfaces 1a and 1b in the vicinity of one end 1c of the drive chassis 1 are formed by punching support shaft accommodating portions 2A and 2B. A spindle (not shown) serving as a rotation center of the drive chassis 1 with respect to the main chassis is attached to each of the spindle housing portions 2A and 2B. The drive chassis 1 rotates with respect to the recording surface of the optical disk inserted into the main chassis, that is, moves up and down by rotating about the support shaft with respect to the main chassis. Then, the optical disk is inserted / removed through the disk tray in the state farthest from the optical disk, that is, rotated and lowered, while the optical disk is moved in the state closest to the optical disk, that is, rotated and raised. Stored.

Further, a projecting piece portion 3 having a U-shaped cross section that is bent so that both sides stand up is integrally formed with the drive chassis 1 at the other end 1 d of the drive chassis 1. On the other hand, a slide cam 20 having a cam groove 21 is formed outside the other end 1d of the drive chassis 1 in the main chassis.
Is supported so as to be slidable in parallel with a support shaft serving as a rotation center of the drive chassis 1, and the projecting piece 3 of the drive chassis 1 is engaged with the cam groove 21. The projecting piece 3 is used for the rotation of the drive chassis 1 performed in accordance with the sliding movement of the slide cam 20, and details of the rotation operation will be described later.

Further, the drive chassis 1 is equipped with an optical head (not shown) for reading information recorded on the recording surface of the optical disc and writing information on the recording surface. This optical head is mainly a light source such as a semiconductor laser that emits laser light, or light such as a photodiode that finally receives and detects reflected light from an optical disk based on the laser light from the light source and converts it into an electrical signal. A detector, a diffraction grating for guiding laser light from the light source to the photodetector through reflection of the optical disk, an optical system such as a half mirror and an objective lens, and a base member to which these components are attached.

Here, the drive chassis 1 is formed with a pair of guide shaft support portions 4A, 4B integrally formed with the drive chassis 1, and the guide shaft support portions 4A, 4B are made of metal guide shafts (
(Not shown) is supported. A base member, which is a component of the optical head, is supported on the guide shaft so as to be movable along the guide shaft, so that the optical head reciprocates in the radial direction along the recording surface of the optical disk. It has become. This reciprocating movement of the optical head is performed by a driving force from an electric motor (not shown) mounted on the drive chassis 1.
For example, a driven gear (not shown) meshes with a slide rack (not shown) attached to the side of the optical head, that is, the base member, and the output of the electric motor is transmitted to the driven gear. Is called. The electric motor is attached to an electric motor support portion 5 formed integrally with the drive chassis 1. The driving force from the electric motor is also used for the rotation of the drive chassis 1, that is, the sliding movement of the slide cam 20, and the insertion / removal movement of the disk tray.

The drive chassis 1 also has a chucking plate (not shown) for chucking the vicinity of the center of the optical disk and a spindle motor (not shown) for applying a rotational force to the chucking plate in order to rotate the stored optical disk. It is installed. The spindle motor is attached to a spindle motor support 6 integrally formed with the drive chassis 1.

Subsequently, the rotation operation of the drive chassis 1 will be described with reference to FIGS. 2 and 3. First, as shown in FIG. 2A and FIG. 3A, a disk tray on which an optical disk (not shown) is placed is inserted into the main chassis from the front side while the drive chassis 1 is lowered. Go. At that time, a rack (not shown) having a predetermined length in the insertion / removal direction formed on the disc tray is engaged with the upper large gear 31 constituting the drive gear 30 supported by the main chassis. A transmission gear (not shown) to which an output from the electric motor mounted on the drive chassis 1 is transmitted to a lower small gear 32 constituting the drive gear 30.
Is always meshed. Thus, the drive gear 30 is generated by the output from the electric motor.
Is driven to rotate, and the disc tray is moved in accordance with the rotation of the drive gear 30. Incidentally, the disk tray is moved out of the main chassis by the drive gear 30 being driven in reverse rotation by the reverse rotation output from the electric motor.

When the disc tray is inserted to the specified position where the insertion limit is reached, the disc tray rack is disengaged from the large gear 31 of the drive gear 30, thereby completing the insertion of the disc tray and completing the storage of the optical disc in the main chassis. To do.

On the other hand, the slide cam 20 has protrusions 2 protruding at intervals in the slide movement direction.
2A and 22B are formed, and each of these protrusions 22A and 22B is engaged with each guide groove (not shown) formed in the disc tray. And just before the disc tray reaches the specified position of the insertion limit, each projection 22A, 22B is pressed by the guide from each guide groove,
As a result, the slide cam 20 slightly slides (slides in the right direction in FIGS. 2A and 3A). As a result, the rack 23 having a predetermined length in the sliding movement direction formed at one end of the slide cam 20 meshes with the small gear 32 of the drive gear 30, and the output from the electric motor starts to be transmitted to the slide cam 20.

Subsequently, the drive gear 30 is rotationally driven by the output from the electric motor, and the slide cam 20 slides as it is according to the rotation of the drive gear 30. Then
As the slide cam 20 slides, the projecting piece 3 of the drive chassis 1 moves into the cam groove 2.
1 so that the drive chassis 1 rotates and rises. Incidentally, when the drive chassis 1 is lowered, the drive gear 30 is driven in reverse rotation by the reverse rotation output from the electric motor, and the slide cam 20 is driven in the reverse direction (FIGS. 2B and 3).
This is done by sliding in the left direction in (b).

When the slide cam 20 moves to a specified position where the slide limit is reached, FIG. 2B and FIG.
As shown in b), the rack 23 of the slide cam 20 is disengaged from the small gear 32 of the drive gear 30, and the slide movement of the slide cam 20 is completed and the drive chassis 1 is lifted. At the same time, the optical disk is chucked.

Thereafter, the optical disk is rotated by the output from the spindle motor. Further, the optical head is moved away from the inner peripheral end position by the output from the electric motor, and information is read from and written to the recording surface of the optical disc by the reciprocation of the optical head.

In such an optical pickup device, the drive chassis 1 is an inexpensive sheet metal molded product, and the protrusion from the drive chassis 1 that engages with the cam groove 21 of the slide cam 20 that is used to rotate the drive chassis 1. Since the piece 3 is formed integrally with the drive chassis 1, the drive chassis of the sheet metal molded product is of course compared with the conventional optical pickup device in which the drive chassis 101 of the synthetic resin molded product is adopted. Compared to the conventional optical pickup device using the improved technology, the increase in the number of parts can be suppressed, and the cost can be greatly reduced.

In addition, this invention is not limited to said embodiment, A various change is possible in the range which does not deviate from the meaning of this invention.

The present invention is useful for an optical pickup device for reproducing and recording information on an optical disc.

It is the perspective view which looked at the drive chassis in the optical pick-up apparatus which is one Embodiment of this invention from the upper surface side. FIGS. 2A and 2B are schematic top views of the optical pickup apparatus employing the drive chassis of FIG. 1 as seen through the main chassis, where FIG. . FIGS. 2A and 2B are schematic front views of a main chassis in an optical pickup device employing the drive chassis of FIG. 1, wherein FIG. . It is the perspective view which looked at the drive chassis in the conventional optical pick-up apparatus from the lower surface side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drive chassis 3 Protrusion piece part 20 Slide cam 21 Cam groove 23 Rack 30 Drive gear

Claims (4)

A main chassis of a synthetic resin molded product in which an optical disk is stored
The main chassis is rotatably supported about a support shaft near one end so as to move toward and away from the recording surface of the optical disk stored in the main chassis, and the optical disk is in the closest state. Drive chassis equipped with an optical head that reciprocates in the radial direction along the recording surface of
A slide cam having a cam groove supported by the main chassis and slidably moved in parallel with the support shaft, and an optical pickup device comprising:
The drive chassis is a synthetic resin molded product, and at the other end, a cylindrical protruding shaft portion is integrally molded with the drive chassis,
In the optical pickup device in which the drive chassis rotates by the projecting shaft portion engaging with the cam groove of the slide cam and being guided along the cam groove according to the slide movement of the slide cam.
Instead of the drive chassis of the synthetic resin molded product, the drive chassis is a sheet metal molded product made of a steel plate, and the other end has a U-shaped projecting piece bent so that both sides stand upright. And is integrally molded with
An optical pickup device in which the drive chassis is rotated by the projecting piece engaging with a cam groove of the slide cam and being guided along the cam groove as the slide cam slides. . A main chassis in which an optical disk is stored;
The main chassis is rotatably supported about a support shaft near one end so as to move toward and away from the recording surface of the optical disk stored in the main chassis, and the optical disk is in the closest state. Drive chassis equipped with an optical head that reciprocates in the radial direction along the recording surface of
A slide cam having a cam groove supported by the main chassis and slidably moved in parallel with the support shaft;
The drive chassis is a sheet metal molded product made of a metal plate, and the other end is integrally formed with the drive chassis with a U-shaped projecting piece bent so that both sides stand up,
An optical pickup device in which the drive chassis is rotated by the projecting piece engaging with a cam groove of the slide cam and being guided along the cam groove as the slide cam slides. . The optical pickup device according to claim 2, wherein the drive chassis is made of a steel plate. 4. The optical pickup device according to claim 2, wherein the main chassis is a synthetic resin molded product.

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