JPH10112061A - Optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce cost by flexibly coping with the specification change of an optical head part and its moving mechanism which constitute an optical disk device. SOLUTION: In this optical disk device 1, an optical head part 3 is constituted of a control unit 4 of a beam spot which includes the component 4a of an optical system and the driving mechanism 7 in the focusing direction or tracking direction and a cover member 5, then the part 5a to be guided and the part 5b to be attached to the moving mechanism 9 are formed on the cover member 5. The cover member 5 is moved by the moving mechanism 9 along the nearly radial direction of a recording medium 2 after it is attached to the control unit 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device having an optical head for reproducing and / or recording a disk-shaped recording medium and a moving mechanism for the disk.

[0002]

2. Description of the Related Art In a reproducing apparatus and a recording / reproducing apparatus for a disk-shaped recording medium, an optical head unit for reading and recording recorded information is supported by a predetermined moving member.
By moving the moving member substantially in the radial direction of the recording medium, coarse positioning of the optical head is performed, and the focusing direction of the optical head (the direction orthogonal to the recording surface of the recording medium) and tracking are performed. The fine positioning in the direction (radial direction of the recording medium) is performed using a driving means called a biaxial actuator.

[0003]

By the way, in the conventional apparatus, the components of the optical system and the driving mechanism in the focusing direction and the tracking direction are supported on a moving member, and the components of the optical system (light emitting unit) are provided. And the light receiving section) also functions as a cover member for isolating the optical system components from the influence of external light and the like, and the specifications are changed because the cover member is not separated. There is a problem in terms of handling and costs.

For example, each time the mounting of the components of the optical system and the driving method thereof are changed, the housing structure of the optical head is redesigned, or the optical adjustment or readjustment of the optical head is performed on the moving member. It needs to be done later.

In addition, the optical head and the moving member are designed separately, and high-precision positioning between the two is required, which complicates the structure, which causes an increase in cost,
Alternatively, the positioning adjustment work takes time and effort.

SUMMARY OF THE INVENTION An object of the present invention is to make it possible to flexibly cope with a change in specifications of an optical head and a moving mechanism thereof, thereby reducing costs.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an optical head unit comprising a component for an optical system and a beam spot control unit including a driving mechanism for focusing and tracking directions. A cover member attached to the control unit, wherein the cover member has a guided portion and an attachment portion to the moving mechanism, and the moving mechanism moves the cover member substantially in the radial direction of the recording medium. It is.

Therefore, according to the present invention, since the beam spot control unit and the cover member can be connected to each other and the cover member can be moved by the moving mechanism, the optically adjusted control unit can be moved to the cover member. The optical head section is formed simply by combining with the optical head section.

[0009]

FIG. 1 shows a basic structure of a main part of an optical disk device 1 according to the present invention.

The disk-shaped recording medium 2 is rotated by rotating means (not shown).
Include those used for the purpose of performing one or both of reading and writing of recorded information. For example, as a read-only recording medium, a compact disk (CD), a laser disk (LD), and the like can be mentioned.
Further, as a readable and writable recording medium, a magneto-optical disk (such as a digital video disk) and a write-once optical disk may be used.

According to the present invention, an optical head unit 3 for reproducing and / or recording on a recording medium 2 is constituted by a component unit of an optical system and a beam spot control unit including a driving mechanism for focusing and tracking directions. 4 and a cover member 5 attached to the control unit 4.

The control unit 4 accommodates, for example, components 4a of an optical system including a light-emitting unit and a light-receiving unit collectively in a housing member 6, and a two-axis unit including a driving mechanism in a focusing direction and a tracking direction. The actuator 7 is provided on the housing member 6, and the biaxial actuator 7 is arranged in a space 8 defined by the housing member 6 and the cover member 5.

Therefore, before the cover member 5 is attached to the control unit 4, the control unit 4
Optical adjustment of the optical system can be completed, and the effect of the vibration of the biaxial actuator 7 on the components and the effect of external light can be reduced by housing the component 4a of the optical system in the housing member 6. Can be.

The cover member 5 is formed with a guided portion 5a and a mounting portion 5b to the moving mechanism 9, and the moving mechanism 9 moves the cover member 5 substantially in the radial direction of the recording medium 2 (FIG. 1).
Is indicated by an arrow A. ).

As the moving mechanism 9, for example, a feed mechanism for linearly moving the cover member 5 using a feed screw can be used. In this case, for example, a bearing is provided on the guided portion 5a. The guide shaft 10 may be inserted through this, and the mounting mechanism 5b may be directly or indirectly driven by the moving mechanism 9. That is, as shown in FIG.
When the mounting portion 5b is directly driven, the nut member 11 is provided on the mounting portion 5b, and the cover member 5 can be moved linearly by rotating the feed screw 12. When the mounting portion 5b is indirectly driven, a moving member that is moved by the feed screw 12 together with the nut member 11 may be provided, and the mounting portion 5b may be fixed to the moving member.

In addition, the mounting portion 5 is formed by using a linear motor.
b, a mechanism using a rack and a pinion,
Alternatively, various configurations such as a mechanism using a transmission member of a driving force such as a gear or a belt can be adopted, and the mounting portion 5b takes various forms according to the structure of the moving mechanism 9. In addition, a mechanism using a rotating arm (such as a swing arm) can be implemented in various forms such as a mechanism that moves the cover member 5 in a direction that does not coincide with the recording medium in the radial direction but substantially along the recording medium. .

It should be noted that the biaxial actuator 7 according to the present invention can have a known configuration, and its structure is not limited. For example, there may be used one using a parallel link, one provided with a member that is rotated about a predetermined axis, and one in which the objective lens and the balance weight are symmetrically arranged around the rotation axis.

It is preferable that the cover member 5 is formed of a material having a magnetic shielding effect for the two-axis actuator 7 from the viewpoint of protection from disturbance or reduction of magnetic influence on peripheral circuit portions. The cover member 5 also has a function of reducing the influence of external light, but a light transmitting window 13 (a hole or a transparent member) is formed on a surface of the cover member 5 facing the recording surface of the recording medium 2. Is done.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below with reference to FIGS.

FIG. 3 shows the control unit 14 and the cover member 15.
The biaxial actuator 16 is supported on an upper surface 17a of a rectangular box-shaped housing block 17.

The two-axis actuator 16 includes the objective lens 1
8 and a movable section 20 including a coil section 19 for focus control and tracking control,
, Are supported by the support portion 22. The connecting member 21 is formed using a leaf spring.

The two-axis actuator 16 is fixed to the upper surface 17a of the housing block 17 via the support base 23, and has a structure capable of adjusting the position between the support portion 22 of the two-axis actuator 16 and the support base 23. I have.

The housing block 17 is formed using a synthetic resin material or a metal material, and is formed by, for example, die casting of zinc, magnesium, aluminum or the like. And
Attachment portions 24, 24,... For attaching the cover member 15 to the upper surface 17a (a screw hole is formed).
And a light transmitting hole 25 is formed.
In other words, components of an optical system such as a laser coupler 26 in which a light emitting portion and a light receiving portion (detection portion) of a laser beam are chipped are accommodated in the accommodation block 17 in a state mounted on a substrate. The light is emitted to the outside of the housing block 17 through the light transmitting hole 25 or the return light enters the inside of the housing block 17. The storage block 17
A connector mounting board 27 is fixed to the side surface of
This is connected to a control circuit (not shown) to electrically control the components of the optical system and the two-axis actuator 16.

The cover member 15 is formed using a synthetic resin material or a metal material mixed with magnetic powder, and as shown in FIGS. 4 and 5, downward (the mounting direction to the housing block 17 is downward). ) Has a concave portion 28 formed by opening. On its upper surface, a substantially elliptical light-transmitting window 2 corresponding to the objective lens 18 described above is provided.
9 are formed, and substantially cylindrical guided portions 30, 30 protruding laterally, and two protruding pieces 31 protruding laterally are provided on portions of the side surfaces facing each other in the longitudinal direction. , 31 are formed integrally with the cover member 15, respectively. The guided portions 30, 30 correspond to the above-described guided portion 5a, and circular holes 30a, 3
A guide shaft is inserted through Oa through a bearing member (not shown). Further, the protruding portions 31, 31 correspond to the mounting portion 5b described above, and are driven by the moving mechanism.

As shown in FIG. 5, insertion holes 32, 32,... Are located on the lower surface of the cover member 15 near the opening edge.
Are formed, and mounting screws 33, 33,
.. (See FIG. 3) are inserted, and these are individually screwed into screw holes formed in the mounting portions 24, 24,. Attached to block 17.

In this embodiment, when assembling the optical head, necessary components are incorporated in the housing block 17, and then the biaxial actuator 16 is mounted on the housing block 17 to perform positioning. Optical adjustment (optical axis alignment, etc.) between the laser coupler 26 in the housing block 17 and the objective lens 18 can be completed. Therefore, after assembling the control unit 14, a simple operation of attaching the cover member 15 to the housing block 17 and supporting the cover member 15 with respect to the moving mechanism can be performed, so that workability and maintainability are excellent, and the cover member is excellent. There is no need to perform optical readjustment of the control unit 14 after attaching the 15 to the moving mechanism. When the specification of the product is changed, it is possible to flexibly cope with the change of the structure of the control unit, and the cover member and the moving mechanism can be shared.

[0027]

As is clear from the above description, according to the first aspect of the present invention, the beam spot control unit and the cover member are connected to each other, and the cover member is moved by the moving mechanism. The optical head can be configured simply by combining the optically adjusted control unit with the cover member, making it easy to respond to specification changes. Therefore, it is not necessary to use a complicated configuration for positioning the optical head portion, and it is possible to reduce the product cost and improve the workability and maintainability.

According to the second aspect of the present invention, the components of the optical system including the light emitting unit and the light receiving unit are accommodated in the accommodating member constituting the control unit, and the accommodating member is defined between the accommodating member and the cover member. By accommodating the two-axis actuator in the space formed, the adverse effect of the vibration of the two-axis actuator on the components of the optical system can be reduced, and the sealing of the components of the optical system can be reduced without relying on the cover member. The reliability of the optical head portion can be improved by ensuring the reliability.

According to the third and fourth aspects of the present invention,
By attaching the component of the feed mechanism constituting the moving mechanism to the cover member and directly moving the cover member by driving the component, the configuration can be simplified.

[Brief description of the drawings]

FIG. 1 is a diagram showing a basic configuration of a main part of the present invention.

FIG. 2 is a diagram illustrating a moving mechanism of a cover member.

FIG. 3 shows an embodiment of the present invention together with FIGS. 3 to 5, and is a perspective view showing a configuration of a main part.

4 shows a cover member together with FIG. 5, and this figure is a longitudinal sectional view.

FIG. 5 is a bottom view of the cover member.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Optical disk apparatus, 2 ... Recording medium, 3 ... Optical head part, 4 ... Control unit, 4a ... Optical system component parts, 5
... cover member, 5a ... guided part, 5b ... mounting part, 6 ...
Housing member, 7: biaxial actuator, 8: space, 9: moving mechanism, 11: component member of feed mechanism

Claims (4)

[Claims] 1. An optical disk device comprising: an optical head for reproducing and / or recording on a disk-shaped recording medium; and a mechanism for moving the optical head. Comprises a beam spot control unit including a driving mechanism for focusing and tracking directions, and a cover member attached to the control unit. The cover member is attached to the guided portion and the moving mechanism. An optical disk device, wherein a cover member is moved along a radial direction of a recording medium by a moving mechanism by forming a portion. 2. The optical disk device according to claim 1, wherein the control unit includes a housing member for housing components of an optical system including a light emitting unit and a light receiving unit, and a focusing direction and tracking supported by the housing member. An optical disk device comprising a two-axis actuator including a direction driving mechanism, wherein the two-axis actuator is housed in a space defined by attaching a cover member to the housing member. 3. The optical disk device according to claim 1, wherein a component of a feed mechanism constituting the moving mechanism is attached to the cover, and the cover is moved by driving the component. An optical disc device characterized by the following. 4. The optical disk device according to claim 2, wherein a component of the feed mechanism constituting the moving mechanism is attached to the cover member, and the cover member is moved by driving the component. An optical disc device characterized by the following.