JP3453810B2 - Optical pickup - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an optical pickup used for reproducing an information signal recorded on an information recording medium such as CD or MO or for recording / reproducing the information signal. .

[0002]

2. Description of the Related Art In an optical disc apparatus for reproducing an information signal recorded on an optical disc such as a compact disc as an information recording medium, the information signal recorded on this optical disc is reproduced through an objective lens. An optical pickup is used for this purpose.

The optical pickup is attached to, for example, a chassis so as to be movable with respect to the chassis. The light from the light source of the optical pickup irradiates the optical disc through the objective lens, and the light reflected from the optical disc is received by the light receiving section.

A conventional optical pickup of this type is shown in FIG.
The structure is as shown in. Referring to FIG. 8, a conventional optical pickup includes a base 1 and an actuator 2.
, Actuator cover 3, flexible holder 4,
A flexible substrate 5 is provided.

An actuator 2 is set for the base 1. The actuator 2 has an objective lens 6.

In the actuator 2 of such an optical pickup, in order to read the information signal from the optical disk, the objective lens 6 of the actuator 2 is designed to follow the warp or surface wobbling of the optical disk, the eccentricity of the optical disk, or the meandering of the track. Lens 6 is in focus direction F
It can move in the direction of CS and the tracking direction TRK. That is, the base 1 can be moved in the tracking direction TRK along the rails of the chassis by driving an actuator (not shown). In addition, the objective lens 6 of the actuator 2
Is movable along the focus direction FCS by energizing a focus coil (not shown).

The actuator cover 3 is provided corresponding to the actuator 2 in order to protect the actuator 2 and prevent dust and dirt from entering the optical pickup (dustproof). In the conventional optical pickup, the actuator cover 3 and the flexible holder 4 described above are made of separate parts. The flexible holder 4 is for fixing the end portion of the flexible substrate 5 to the base 1.

Further, when the base 1 is attached to the rails of the chassis, it is necessary to separately prepare a play removing spring 7 shown in FIG.

FIG. 9 is a sectional view taken along line AA of the conventional optical pickup shown in FIG. Using this backlash removing spring 7, the base 1 of the optical pickup is
It must be attached to the rail 9a of the chassis 9 without play.

Further, an optical component, for example, a light source for irradiating the surface of the optical disk with light through an objective lens, and a light receiving element for receiving the light reflected from the optical disk are mounted on the chassis as follows. It is set. That is, at the time of adjusting the position of the optical component, another jig holding spring 8 shown in FIG. 8 is attached, and after adjusting the position of the optical component with respect to the base 1, the jig holding spring is adjusted. It requires work such as removing. Then, after adjusting the position of the optical component, the optical component is fixed to the base 1 only with an adhesive.

[0011]

In such a conventional optical pickup, the base 1 and the flexible holder 4 are used.
Is a separate body, and is also a separate body spring 7 for removing backlash.
Alternatively, a jig pressing spring 8 and the like are separately required. For this reason, the number of parts constituting the optical pickup is large, the assembly process is complicated, and it is difficult to secure the reliability of the assembly work.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an optical pickup which can reduce the number of parts, improve the assemblability, and have high reliability.

[0013]

SUMMARY OF THE INVENTION In the present invention, the above object is achieved in the radial direction of the information recording medium with respect to the chassis.
The information signal of the information recording medium can be moved by the lens.
Through the optical element for reproduction or recording / reproduction.
The optical pickup used to produce
Operate the lens in tracking and focus directions
Cover to cover the actuator for
Hold down the power supply section to supply power to the chute
Setting means having a power feeding portion holding means for pressing and a pressing portion
The optical pickup for the chassis.
When attaching, press the above-mentioned part and the above-mentioned optical pick-up.
The rails of the chassis above with the base of the chassis.
Setting means for preventing looseness of the optical pickup
And a power supply unit holding means, and the setting means
Is formed integrally with the above cover before assembly.
This is achieved by an optical pickup characterized by

In the present invention, preferably, an optical component holding means for holding an optical component used in association with the lens is further attached to the cover before assembling.
It is integrally molded . In the present invention, preferably, the optical component includes a light source and a light receiving element.

[0015]

According to the above construction, the cover protects the actuator. At the time of assembling the optical pickup, the feeding portion pressing means holds down the feeding portion, and preferably the optical component holding means holds down the optical component.
Then, the assembled optical pickup is attached to the chassis by the setting means so as to prevent backlash.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. The examples described below are preferred specific examples of the present invention, and therefore, various technically preferable limitations are given, but the scope of the present invention particularly limits the present invention in the following description. Unless otherwise stated, the present invention is not limited to these modes.

FIG. 1 shows a part of an optical disk device equipped with the optical pickup of the present invention. In FIG.
The optical pickup 10 is arranged near the turntable 12. An optical disk 14 such as a compact disk can be removably attached to the turntable 12.

By driving a motor (not shown),
The disc 14 on the turntable 12 can be rotated. Further, by driving an actuator (not shown), the optical pickup 10 can move with respect to the chassis 13 in the tracking direction TRK direction (radial direction of the disk 14). The objective lens 16 of the optical pickup 10 can move along the focus direction FCS by energizing the focus coil.

As a result, the objective lens 16 of the optical pickup 10 reads the information signal of the optical disk 14, so that the optical disk 14 is warped or wobbling, and the optical disk 14 is deflected.
So that you can follow the eccentricity of the
The objective lens 16 can relatively move along the focus direction FCS and the tracking direction TRK.

As shown in FIGS. 3 and 4, a rack 34 is formed on the base 20. The rack 34 is engaged with a pinion (not shown) of the chassis 14 shown in FIG. By driving an actuator such as a motor, the base 20 can be moved in the tracking direction TRK via the pinion.

The actuator 22 shown in FIG. 3 and FIG.
It has a stator portion 40 and a movable portion 42. Movable part 42
The objective lens 16 is attached to the. Movable part 42
Is movable along the focus direction FCS with respect to the base 44. This focus direction FCS
The movement of the magnet 40b and the yoke 40 on the side of the stator 40 is performed by energizing the focus coil 42a on the side of the movable portion 42 via the flexible substrate 30.
It can be done for a.

The adjustment work of each element of the optical pickup 10 includes the angle adjustment of the objective lens 16 and the objective lens 1.
6 position adjustment, mirror 26 orientation adjustment, and vertical position adjustment of the optical element 28. The flexible substrate 30 is a cable for supplying power to the circuit section 50 for the focus coil 42a of the actuator 22 to be supplied with power.

Mounting portion 54 of flexible substrate 30
Is attached to the attachment portion 21 of the base 20. The circuit unit 50 is provided, for example, with the focus coil 4
2a for supplying power to the optical element 28, supplying power to the light source of the optical element 28, and receiving a signal from the light receiving element portion of the optical element 28.

The optical element 28 is, for example, a laser coupler and preferably incorporates the above-mentioned light source and light receiving element. The laser light emitted from the optical element 28 is reflected by the mirror 26 and is irradiated onto the lower surface of the optical disc 14 of FIG. 1 via the objective lens 16. Then, the optical disc 14
The light reflected from the lower surface of the mirror is reflected again by the mirror 26,
The light receiving element of the laser coupler receives light.

The actuator cover 24 is shown in FIGS.
The structure is as shown in. The actuator cover 24 has a protective cover portion 60 for covering the actuator 42, a power feeding portion holding means 62 for holding the flexible substrate 30, and a backlash when setting an optical pickup with respect to the chassis 14 of FIG. For setting the optical element 28, and preferably for holding the optical component 28.

That is, the protective cover portion 60 of the actuator cover 24 is integrally formed with the feeding portion pressing means 62, the setting means 64 for preventing backlash, and preferably the optical component pressing means 66. , As a molded part made of a resin such as ABS resin.

An opening 70 corresponding to the objective lens 16 is formed in the actuator protection section 60.

As particularly shown in FIG. 5, the power feeding portion pressing means 62 is a portion formed continuously with the actuator protection portion 60. As shown in FIG. 3, the power feeding portion pressing means 62 sandwiches the portion 74 of the flexible substrate 30 between the corresponding portion 72 of the base 20 and
It can be fixed.

As shown in FIG. 5, the feeding portion pressing means 62.
The setting means 64 for preventing the above-mentioned backlash and the optical component holding means 66 for holding the optical component 28 are formed more preferably.
The setting means 64 and the optical component pressing means 66 are formed so as to extend in a direction parallel to the focus direction, as shown in FIGS.

First, the setting means 64 for preventing play will be described with reference to FIGS. 4 and 6. A pressing portion 64a having a spring property is provided below the setting means 64. The rail 1 of the chassis 13 is provided between the pressing portion 64a and the projection 20a which is also called a receiving portion of the base 20.
3a is sandwiched. As a result, the base 20 is prevented from rattling along the vertical direction X in FIG. 6 with respect to the rail 13a of the chassis 13, and can be moved along the rail 13a (front side in FIG. 6). Can be installed.

The optical pickup 16 can be operated for tracking along the rail 13a in the tracking direction TRK as shown in FIG.

Next, the optical component holding means 66 will be described with reference to FIGS. 4 and 7. Optical component holding means 6
Reference numeral 6 denotes a portion having a spring property, and the optical element 28 can be pressed and fixed to the protrusion 20b of the base 20. That is, in FIG. 8, when adjusting the position of the optical component 28, which is also referred to as an optical element, in the up-down direction X, the optical component holding means 66 holds the optical component 28. Then, after adjusting the position of the optical component 28 in the vertical direction X, the optical component pressing means 66 serves as a protective member for the optical component 28. The optical component 28 is
In FIG. 8, the protrusion 20b of the base 20 is preferably fixed by adhesion. That is, the optical component 2
8 is fixed to the base 20 by adhesion and is protected from the outside by the optical component pressing means 66.

As shown in FIGS. 3 and 5, the actuator cover 24 is provided with two claw portions 80 and 82. The actuator cover 24 is fixed to the base 20 by the claws 80 and 82 and the screw 90.

The present invention is not limited to the above embodiment. For example, the protective cover portion 60 of the actuator cover 24, the feeding portion pressing means 62, the setting means 64 for preventing backlash, and the optical component pressing means 66 shown in FIGS. 2 and 3 are formed of resin in the above-described embodiment. It is integrally molded as a part. However, the present invention is not limited to this, and for example, an insert-molded product in which at least one of the setting means 64 for preventing play and the optical component pressing means 66 is a sheet metal can be used. Alternatively, the entire actuator cover 24 can be made of sheet metal.

Further, the optical pickup of the present invention is not limited to the application of an optical disc device for reproducing an information signal recorded on a compact disc, but may reproduce or record an information signal recorded on a magneto-optical disc or the like. It can also be applied to an optical disk device for reproducing.

As described above, according to the embodiment of the present invention, the feeding portion holding portion 62 for holding the flexible substrate is held.
Then, the optical pickup is assembled by using the optical component pressing means 66 which preferably presses the optical element against the base. Then, after adjusting the position of the optical element, the optical element is fixed.

After assembling the optical pickup in this way, the optical pickup is attached to the rails of the chassis. At the time of this attachment, the rail is sandwiched between the setting means and the receiving portion of the base. As a result, the optical pickup can be attached to the chassis without backlash.

The actuator cover of the optical pickup includes, for the protective cover portion, means for pressing the power feeding portion, setting means for preventing backlash when setting on the chassis, and preferably means for further holding the optical component. , Have become one. As a result, the actuator cover can be made multifunctional and integrated, so that the number of parts can be reduced and the assemblability can be improved.

[0039]

As described above, according to the present invention, it is possible to reduce the number of parts, improve the assemblability, and increase the reliability.

[Brief description of drawings]

FIG. 1 is a perspective view showing a preferred embodiment of an optical disc device equipped with an optical pickup of the present invention.

FIG. 2 is a perspective view showing the entire optical pickup of FIG.

FIG. 3 is an exploded perspective view of the optical pickup of FIG.

FIG. 4 is a perspective view of an exploded perspective view of the optical pickup of FIG. 3 viewed from another direction.

5 is an enlarged view of the actuator cover shown in FIGS. 2 and 3. FIG.

FIG. 6 is a cross-sectional view showing engagement or setting of a setting unit that is integrated with the actuator cover shown in FIG.

7 is a cross-sectional view showing an optical element held by an optical component holding means integrated with the actuator cover shown in FIG.

FIG. 8 is a perspective view showing a conventional optical pickup.

9 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

10 Optical pickup 12 turntable 13 chassis 14 Optical disc 16 Objective lens 20 base 22 Actuator 24 Actuator cover 28 Optical element (optical component) 30 flexible substrate 60 Actuator protection part 62 Power feeding unit holding means Setting means to prevent backlash 66 Optical component holding means

Claims (3)

(57) [Claims] 1. A radial direction of an information recording medium with respect to a chassis
Is movable along the direction information through a lens information signal recording medium is an optical pickup used for receiving to play or or reproducing on the optical element, the tracking direction and the focus direction the lens A cover for covering the actuator for operating the power supply, a power feeding unit holding means for holding the power feeding unit for feeding power to the actuator, and a setting unit having a pressing unit, and the optical unit for the chassis. when Ru fitted with a pick-up, press the
Between the attachment part and the base of the optical pickup described above,
Setting means for preventing rattling of the optical pickup by sandwiching the chassis rail, the power feeding part holding means and the setting means are integrally formed with the cover before assembly. An optical pickup that is characterized by being. 2. An optical component holding means for holding an optical component used in association with the lens is integrally formed with the cover before assembly.
The optical pickup described in. 3. The optical pickup according to claim 1, wherein the optical component includes a light source and a light receiving element.