JP2002032926A - Optical pickup device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concrete structure for reducing unnecessary resonance of a movable member, with respect to an optical pickup device where the movable member provided fixedly with an objective lens converging a laser beam on an optical disk, is rockably supported with a plurality of metallic wires, one end of which is fastened on the movable member and the other end of which is held on the fixing member of a fixed part. SOLUTION: The plurality of metallic wires 6 are constituted so that the other end of the wires are each fastened on the free end of plural metallic members 11 whose opposite end is fixed on a printed board 9 locked on the fixing member 7. The metallic members 11 are composed elastically deformably in the longitudinal direction of the metallic wires 6. Through the metallic members 11 and the metallic wires 6, an electric current is supplied from the printed board 9 to the focus coil 3 and the tracking coil 4 which are installed in the movable member 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an actuator for an optical pickup device, and more particularly to a structure for reducing unnecessary resonance.

[0002]

2. Description of the Related Art A conventional optical pickup device will be described below. FIG. 5 is a plan view of an actuator of a conventional optical pickup device. In FIG. 5, reference numeral 1 denotes a substantially cubic movable member made of resin or the like. The lens 2 is fixed by an adhesive or the like. A focusing coil 3 for driving the objective lens 2 in the focus direction is wound around the movable member 1 together with the movable member 1 on the outer side surface. A coil 4 is provided.
Reference numerals 5a and 5b denote permanent magnets constituting a magnetic circuit for driving the movable member 1 in the focus direction and the tracking direction. So that it is provided on the fixed part. Numeral 6 denotes a metal wire, and two ends thereof are fixed to a side surface of the movable member 1 on which the tracking coil 4 is mounted at a predetermined interval. And the other end of each of these metal wires 6 is
Through a through hole 8 provided in a fixing member 7 fixed to the chassis of the apparatus, the fixing member 7 is fixed to the back side of the fixing member 7 and is fixed to a printed circuit board 9. That is, the movable member 1 is provided with the four metal wires 6 substantially parallel to each other.
Thus, it is supported in a state protruding from the fixing member 7.
Reference numeral 10 denotes a viscoelastic member filled in the through hole 8 in order to reduce unnecessary vibration of the movable member 1. After the viscoelastic member 10 is injected into the through hole 8 in a liquid state, the viscoelastic member 10 is irradiated with ultraviolet rays to be in a gel state. With this configuration, by selectively supplying a current to the tracking coil 4 and the focus coil 3 through the metal wire 6, the metal wire 6
Objective lens 2 with movable part 1 while elastically deforming
Moves in the focus direction and the tracking direction. In the above configuration, in order to further suppress unnecessary resonance occurring in the movable portion when the optical disk rotates at high speed, it is effective to make the movable member 1 displaceable in the longitudinal direction of the metal wire 6. It has been confirmed that, conventionally, as shown in FIG. 5, the metal wire 6 is arranged in a bow shape so that the protruding portions are located outside the object lens 2 around the center,
The structure for supporting the movable member 1 is adopted.

[0003]

However, when unnecessary resonance is suppressed in this way, in order to attach the metal wire 6 to the movable member 1 in a curved state, the metal wire 6 is attached using a special jig. It is necessary to bend, and it is difficult to arrange the movable member 1 at a predetermined position due to variation in the amount of bending, and the objective lens 2 is shifted from the optical axis, so that stable production is extremely difficult. Met.

[0004]

In order to solve the above-mentioned problems, an optical pickup device according to the present invention comprises a plurality of metal wires having one ends fixed to a movable member, and the other ends fixed to a fixed member. One end is fixed to the printed circuit board, the other end is fixed to the other end of the metal member that has become a free end, and the metal member is configured to be elastically deformable in the longitudinal direction of the metal wire, A current is supplied from a printed circuit board to the focus coil and the tracking coil provided on the movable member through the metal member and the metal wire, and a metal wire is provided by utilizing elastic deformation of the metal member. The movable member is configured to be displaceable in the longitudinal direction, and it is not necessary to attach the metal wire to the movable member 1 in a curved state, thereby enabling stable production.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, a movable member having an objective lens for focusing a laser beam on an optical disk is fixed to one end of the movable member, and the other end is fixed to the movable member. In an optical pickup device swingably supported by a plurality of metal wires supported by a fixing member of a fixing portion,
The other end of the metal wire has one end fixed to a printed circuit board fixed to the fixing member, and the other end fixed to the other end of the metal member whose free end is a free end. A light source configured to be elastically deformable in a longitudinal direction of the wire, and to supply a current from the printed circuit board to a focus coil and a tracking coil provided on the movable member through the metal member and the metal wire. It is a pick-up device, and it is configured so that the movable member can be displaced in the longitudinal direction of the metal wire by utilizing the elastic deformation of the metal member, so that it is not necessary to attach the metal wire to the movable member in a curved state. , Stable production becomes possible.

According to a second aspect of the present invention, after the metal member extends vertically from the printed circuit board,
The optical pickup device according to claim 1, wherein the optical pickup device is bent and formed in an L shape, and the other end of the metal wire is fixed to the bent portion. Since the metal member is formed in an L shape, the movable portion can be more easily displaceable in the longitudinal direction of the metal wire by utilizing the elastic deformation of the metal member.

The invention according to claim 3 of the present invention is the optical pickup device according to claim 1, wherein the metal member is made of phosphor bronze or beryllium copper, and the metal member is elastically deformed. The movable part can be more easily displaceable in the longitudinal direction of the metal wire by utilizing the above. The invention according to claim 4 of the present invention is characterized in that the metal wire is
The metal member is fixed through the through hole formed in the fixing member, and a viscoelastic member is filled in the through hole. 2. The optical pickup device according to claim 1, wherein a side wall covering a gap between the movable member and the member is formed in the through hole so as to reduce unnecessary vibration of the movable member. During the manufacturing process, a liquid viscoelastic material is injected into the through-holes and then irradiated with ultraviolet rays to form a gel.However, the liquid viscoelastic material may flow out and adhere to surrounding components. However, the side wall formed in the fixing member so as to cover the gap between the surface of the fixing member where the through hole is formed and the metal member does not flow out to the outside. The invention according to claim 5 of the present invention is the optical pickup device according to claim 4, wherein a bent portion is formed in the metal member, wherein the bent portion is formed to reduce unnecessary vibration of the movable member. In order to fill the through hole with a viscoelastic member, a liquid viscoelastic material is injected into the through hole at the time of manufacture, and then ultraviolet rays are irradiated to form a gel, but a bent portion is provided on the metal member. This makes it difficult for the liquid viscoelastic material to flow to the outside.

According to a sixth aspect of the present invention, the metal wire passes through a through hole formed in the fixing member and is fixed to the metal member, and a viscoelastic member is provided in the through hole. The optical pickup device according to claim 1, wherein the metal member is filled with a plug member whose tip end is provided in the through hole and is movably inserted in the through hole.
At the time of manufacture, the plug member prevents the liquid viscoelastic material from flowing out of the through-hole and adhering to peripheral components and the like.

(Embodiment 1) The first aspect of the present invention will be described below.
An embodiment of the invention described in claims 2 and 3 will be described with reference to FIG. Note that components having functions similar to those of the conventional example are denoted by the same reference numerals. FIG. 1 is a plan view of an actuator of an optical pickup device according to an embodiment of the present invention. In FIG.
Reference numeral 1 denotes a movable member made of resin, which has a shape in which a semi-cylindrical body is joined to one side surface of a rectangular parallelepiped portion. An objective lens 2 for condensing a laser beam on an optical disk is fixed to the semi-cylindrical portion with an adhesive or the like. The focus coil 3 is fixed along three side walls of the through hole 1a formed in the rectangular parallelepiped portion, and the tracking coil 4 is fixed so as to protrude from two opposing side walls. A permanent magnet 5b is arranged at a central portion of the focus coil 3 with a predetermined gap, and a permanent magnet 5a is arranged to face the permanent magnet 5b via the tracking coil 4. A printed circuit board 9 is fixed to the back surface of the fixing member 7 fixed to the chassis. A metal member in the form of a strip or a line, which extends vertically from the printed circuit board 9 and is then bent outwardly by 90 degrees to form an L-shape. And an air gap is formed between them. One end is fixed to the movable member 1,
The other end of each of the four metal wires 6 supporting the metal member 11 is fixed to a bent portion of the metal member 11 through a through hole 8 provided in the support member 7. This metal member 1
Due to the elastic deformation of the movable member 1, the movable member 1 can be easily moved in the longitudinal direction of the metal wire 6, and the degree of expansion and contraction can be easily adjusted by changing the thickness of the metal member 11 and the like. Unnecessary resonance generated in the member 1 can be suppressed. Further, current can be supplied to the focus coil 3 and the tracking coil 4 mounted on the movable member 1 from the printed circuit board 9 via the metal member 11 and the metal wire 6.

(Embodiment 2) Hereinafter, a fourth aspect of the present invention will be described.
And about the embodiment of the invention described in claim 5,
This will be described with reference to FIGS. The same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted. 2 and 3 are perspective views of the optical pickup device according to the embodiment of the present invention, in which a part of the fixing member 7 is cut away. In FIG. 2, a side wall 12 is formed around the through hole 8 so as to cover a gap formed between a bent portion of the metal member 11 fixed to a printed board 9 (not shown) and the fixing member 7. Are formed integrally with the fixing member 7. At the time of manufacturing in which the viscoelastic member 10 is filled in the through hole 8 in order to reduce unnecessary vibration of the movable member 1, a liquid viscoelastic material is injected into the through hole 8 and then irradiated with ultraviolet rays to be in a gel state. At this time, the liquid viscoelastic material may flow out and adhere to the surrounding components. However, due to the side wall 12 formed around the through hole 8 of the fixing member 7, it does not flow out to the outside. In FIG. 3, the fixing member 7 is provided with the side wall 13 and the metal member 11 is provided with the bent portion 1.
An example in which 1a is provided is shown. Thereby, the viscoelastic material 10
Of the metal wire 6 can be more effectively prevented, and the accuracy in assembling the metal wire 6 can be improved. Also, by changing the length of the bent portion 11a, the degree of expansion and contraction can be easily adjusted.

(Embodiment 3) The sixth embodiment of the present invention will be described below.
The embodiment of the invention described in (1) will be described with reference to FIG. The same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

FIG. 4 is a sectional view of a fixing portion of the optical pickup device according to the embodiment of the present invention. In FIG.
A plug member 13 having a diameter slightly smaller than the diameter of the through hole 8 provided in the fixing member 7 is provided in the metal member 11, and the tip of the plug member 13 is movably inserted into the through hole 8. This plug member 1
According to 3, it is possible to prevent the liquid viscoelastic member 10 from leaking out of the through hole 8 during manufacturing.

[0013]

As described above, according to the optical pickup device of the present invention, the movable member can be displaced in the longitudinal direction of the metal wire by utilizing the elastic deformation of the metal member. In addition, there is no need to attach the metal wire to the movable member in a curved state, and stable production can be performed.

[Brief description of the drawings]

FIG. 1 is a plan view showing an optical pickup device according to a first embodiment of the present invention.

FIG. 2 is a cutaway perspective view of a fixing portion of the optical pickup device according to Embodiment 2 of the present invention.

FIG. 3 is a cutaway perspective view showing another example of the fixing portion of the optical pickup device according to Embodiment 2 of the present invention.

FIG. 4 is a sectional view showing a fixing portion of the optical pickup device according to the third embodiment of the present invention.

FIG. 5 is a plan view of a conventional optical pickup device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Movable member 2 Objective lens 3 Focus coil 4 Tracking coil 5a, 5b Permanent magnet 6 Metal wire 7 Fixing member 8 Through hole 9 Printed circuit board 10 Viscoelastic material 11 Metal member 12 Side wall 13 Plug member

Claims (6)

[Claims] 1. A movable member to which an objective lens for condensing a laser beam is fixed on an optical disk, a plurality of metal wires having one end fixed to the movable member and the other end supported by a fixed member of the fixed portion. In the optical pickup device supported swingably by the other end of each of the plurality of metal wires,
One end is fixed to a printed circuit board fixed to the fixing member, and the other end is fixed to the other end of a plurality of metal members having free ends, respectively, and the metal member is elastic in a longitudinal direction of the metal wire. An optical pickup device which is configured to be deformable and supplies current from the printed circuit board to a focus coil and a tracking coil provided on the movable member through the metal member and the metal wire. 2. The metal member extends in a vertical direction from the printed circuit board and is bent to form an L-shape. The other end of the metal wire is fixed to the bent portion. 2. The optical pickup device according to claim 1, wherein: 3. The optical pickup device according to claim 1, wherein said metal member is made of phosphor bronze or beryllium copper. 4. The metal wire passes through a through hole formed in the fixing member and is fixed to the metal member, and the through hole is filled with a viscoelastic member. The side wall that covers a gap between a surface having a through hole and the metal member is formed on the fixing member.
The optical pickup device according to 1. 5. The optical pickup device according to claim 4, wherein a bent portion is formed on the metal member. 6. The metal wire passes through a through-hole formed in the fixing member and is fixed to the metal member. The through-hole is filled with a viscoelastic member. 2. The optical pickup device according to claim 1, wherein a tip member is provided in said through hole, said plug member being movably inserted in said through hole.