JPH11175993A - Supporting mechanism for optical pickup - Google Patents

Abstract

PROBLEM TO BE SOLVED: To assemble a wire in a holding member by soldering both sides of the wire to a wiring board beforehand. SOLUTION: A notch-like recessed part 23 having three open surfaces of upper, front and rear surfaces is formed in a holding member 22, and after both ends of each wire 26 are soldered to focussing and tracking coils attached to a lens holder 20 and a flexible printed board 25 stuck to a clogging member 24, each wire 26 is inserted into the recessed part 23 from the upper part of the holding member 22 and the clogging member 24 is fixed to the upper and rear surfaces of the holding member 22 by using adhesives. Thus, the two surfaces of the recessed part 23, i.e., the upper and rear surface, excluding the front surface, are closed by the clogging member 24 and, after a fluid resin such as ultraviolet hardening resin or the like is supplied from the front open end of the recessed part 23, the holding member 22 and the clogging member 24 are irradiated with ultraviolet rays and thus each wire 26 is surrounded with a damper material 27 obtained by hardening the fluid resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup for recording / reproducing a signal on / from a medium such as an optical video disk and a compact disk, and more particularly to a lens holder having an objective lens and a drive coil mounted on a wire. The present invention relates to a support mechanism for an optical pickup that is elastically supported by a holding member via the optical pickup.

[0002]

2. Description of the Related Art FIGS. 8 and 9 show a prior art described in Japanese Utility Model Application Laid-Open No. 4-121027, FIG. 8 is an external view showing a support mechanism of an optical pickup, and FIG. 9 is a line AA in FIG. FIG.

As shown in these figures, an objective lens 1 is mounted on a lens holder 2, and a focus coil 3 and a tracking coil 4 are wound around the lens holder 2, respectively. Four wires 5 made of a flexible metal material are fixed to the lens holder 2, and one ends of these wires 5 are soldered to the focus coil 3 and the tracking coil 4, respectively. The holding member 6 made of a light-transmitting material is provided with four recesses 7. The recesses 7 are formed at a predetermined depth from the front surface of the holding member 6 to the inside, and are held through small-diameter through holes 8. It reaches the back of the member 6. The other end of each wire 5 is inserted into the recess 7 and the through hole 8 respectively, and the damper material 1 filled in the recess 7 is provided.
It is surrounded by 0. The damper material 10 is made of a viscoelastic material such as a gelled UV-curable resin, and is filled in the concave portion 7 in a flow state before gelation, and then cured by irradiating the holding member 6 with UV light. Is done. The other end of each wire 5 is on the back of the holding member 6 on the circuit board 9.
, And each wire 5 also has a function of guiding a current flowing through the focus coil 3 and the tracking coil 4.

A pair of permanent magnets 12 and 13 are arranged at positions facing each other with the focus coil 3 and the tracking coil 4 interposed therebetween, and these permanent magnets 12 and 13 are fixed to the yoke 11 so that they have the same polarity. ing. The yoke 11 is attached to the holding member 6, and these yokes 1
1 and the permanent magnets 12 and 13 form a magnetic circuit. As a result, the permanent magnets 12 and 13 generate a magnetic flux in a direction intersecting with the direction of the current flowing through the focus coil 3 and the tracking coil 4, that is, in the Y direction of the coordinate axis in FIG.

Therefore, the force generated by the current flowing through the focus coil 3 is generated in the left and right directions in the Z direction, and the lens holder 2 is moved in the focus direction of the objective lens 1. Similarly, the tracking coil 4
The force in the X direction of the coordinate axis acts also by the current flowing through the lens holder 2, and the lens holder 2 is moved in the tracking direction of the objective lens 1. At this time, if the movable portion including the objective lens 1 and the lens holder 2 tries to resonate at a frequency determined by the mass and the stiffness of the wire 5, the wire 5
The portion surrounded by the damper member 10 is also displaced in the X and Z directions of the coordinate axes in FIG. 8, and the distortion caused by this displacement is absorbed by the damper member 10, thereby suppressing the resonance of the movable part.

[0006]

However, in the above-mentioned conventional optical pickup support mechanism,
Each of the wires 5 soldered to the focus coil 3 and the tracking coil 4 of the lens holder 2 is inserted into the concave portion 7 and the through hole 8 of the holding member 6 and soldered to the land of the circuit board 9. Wire 5 is inserted into recess 7 and through hole 8
Before the soldering operation, the soldering work on both ends cannot be performed, and the holding member 6 becomes a hindrance at the time of soldering. Further, the concave portion 7 in which the damper material 10 is filled.
Is a hole that opens only the front surface of the holding member 6, and is configured such that a fluid liquid before hardening is stored in the hole and then hardened, so that the holding member 6 secures the upper wall of the concave portion 7. (A portion corresponding to the dimension L in FIG. 9) is required, which also has a problem in that the holding member 6 is prevented from being thinned.

[0007]

According to the present invention, a recess filled with a damper material has a notch shape in which one of upper and lower surfaces of a holding member and three surfaces of a front surface and a back surface are opened, and the front surface of the notch is formed. The remaining two surfaces except for are closed by a closing member. When such a notch-shaped recess is provided in the holding member, both ends of each wire are soldered in advance to the focus coil and the tracking coil and the wiring board, and then each wire is inserted into the recess from one of the upper and lower surfaces of the notch. In addition, if the remaining two surfaces except the front surface of the notch are closed by a closing member, the fluid damper material before hardening can be stored in the recess, and the assembling work including soldering work is improved. . In particular, if the remaining two surfaces except the front surface of the notch are closed with a flexible printed circuit board, the flexible printed circuit board can also serve as a closing member, thereby reducing the number of components and realizing a thinner holding member. it can.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In an optical pickup support mechanism according to the present invention, a lens holder on which an objective lens, a focus coil and a tracking coil are mounted, and a plurality of lenses each having one end electrically connected to the focus coil or tracking coil. Book wire, a wiring board electrically connected to the other ends of the wires, a holding member having the recess to which the wiring board is attached and through which the wire is inserted, and a damper filled in the recess With materials,
The recess was formed of a notch having one of the upper and lower surfaces and three front surfaces, that is, a front surface and a back surface, and the remaining two surfaces except the front surface of the notch were closed by a closing member attached to the holding member.

With this configuration, after the focus coil, the tracking coil, and the wiring board are soldered in advance to both ends of each wire, each wire is incorporated into the recess from one of the upper and lower surfaces of the notch and the notch is formed. If the remaining two surfaces except the front surface are closed by the closing member, the fluid damper material before hardening can be stored in the recess, so that the assembling work including the soldering work is improved.

The closing member may be a dedicated member such as a molded product. However, if the closing member is also used as a wiring board made of a flexible printed circuit board, an increase in the number of components can be suppressed and the holding member can be made thinner. Can be.

[0011]

Embodiments will be described with reference to the drawings.
FIG. 1 is a plan view of an optical pickup according to a first embodiment of the present invention, FIG. 2 is a side sectional view of the optical pickup of FIG.
FIG. 3 is an exploded perspective view of main components provided in the optical pickup of FIG. 1, and FIG. 4 is a perspective view showing an assembled state of the main components of FIG.

In these figures, a member denoted by reference numeral 20 is a lens holder, and an optical system component including an objective lens 21 and a focus coil and a tracking coil (not shown) are attached to the lens holder 20. Sign 2
The holding member 2 is made of a transparent or translucent synthetic resin such as polycarbonate.
Are formed with a pair of recesses 23 at predetermined intervals. Each of the recesses 23 is formed by a notch having an open upper surface, three front surfaces and a rear surface, and is tapered from the front surface to the rear surface. The member denoted by reference numeral 24 indicates a closing member, and the closing member 24 is formed of a transparent or translucent synthetic resin such as polycarbonate. The closing member 24 has an L-shaped cross section in which a vertical wall and a horizontal wall are orthogonal to each other, and a flexible printed circuit board (F
(PC) 25 is stuck. A wiring pattern (not shown) is routed on the flexible printed board 25.
Through holes are provided in the land of the wiring pattern and the closing member 24. The closing member 24 is fixed to the upper surface and the rear surface of the holding member 22 using an adhesive or the like. The upper surface and the rear surface of the recess 23 except for the front surface are closed by the closing member 24.

The four wires denoted by reference numeral 26 are made of a flexible metal material, and one ends of these wires 26 are soldered to the focus coil and tracking coil on the lens holder 20 side directly or via a connecting member. . The other end of each wire 26 is soldered to the land of the flexible printed circuit board 25 through the recess 23 and the above-mentioned through hole, and the damper material 2 filled in the recess 23 is formed.
7 surrounded. The damper material 27 is filled with a fluid resin such as an ultraviolet curable resin from the front open end of the concave portion 23 and then transmitted through the holding member 22 and the closing member 24 to irradiate ultraviolet rays to thereby form the fluid resin. Made of a gel-like viscoelastic material obtained by curing the viscoelastic material. Although not shown, a magnetic circuit that generates a magnetic flux in a direction that intersects with the direction of the current flowing through the focus coil and the tracking coil is arranged as in the above-described conventional example.

Therefore, the lens holder 20 is moved in the focusing direction of the objective lens 21 by the force generated by the current flowing through the focus coil, and the lens holder 20 is moved by the force generated by the current flowing through the tracking coil. Moved in the direction. At this time, if the movable portion including the objective lens 21 and the lens holder 20 attempts to resonate at a frequency determined by its mass and the stiffness of the wire 26, the portion of the wire 26 surrounded by the damper material 27 also moves in the focus direction. In addition, the vibration is displaced in the tracking direction, and the distortion caused by this displacement is absorbed by the damper member 27, so that the resonance of the movable part is suppressed.

In the first embodiment, as shown in FIG. 3, both ends of each wire 26 are connected to a focus coil, a tracking coil, and a closing member 24 on the lens holder 20 side.
After each of the wires 26 is soldered to the flexible printed circuit board 25 on the side of the
3 and fixing the closing member 24 to the upper surface and the rear surface of the holding member 22 using an adhesive or the like, as shown in FIG.
The surface is closed by the closing member 24, and the damper material 27 in a flowing state before gelation (hardening) can be stored in the concave portion 23. Therefore, when soldering the both ends of the wire 26, the holding member 22 does not become an obstacle, and the assembly workability including the soldering work can be improved. Further, the lens holder 20 and the closing member 24 are provided at both ends of the wire 26.
Since the wire 26 can be inserted into the recess 23 of the holding member 22 after the
6, the lens holder 20 and the closing member 24 can be formed in advance by outsert molding at both ends,
It can also greatly improve productivity.

In the above embodiment, the case where the closing member 24 is an L-shaped member in which the vertical wall and the horizontal wall are integrally formed has been described. However, the vertical wall and the horizontal wall are not necessarily integrated. For example, a general printed board made of paper or the like may be used as the vertical wall, and current may be supplied to the focus coil and the tracking coil via the printed board.

FIG. 5 is a side sectional view of an optical pickup according to a second embodiment of the present invention, FIG. 6 is an exploded perspective view of main parts provided in the optical pickup of FIG. 5, and FIG. 7 is a main part of FIG. FIG. 5 is a perspective view showing an assembled state, and portions corresponding to FIGS. 1 to 4 are denoted by the same reference numerals.

This embodiment differs from the first embodiment in that the flexible printed circuit board 28 also serves as a closing member, and the other structures are basically the same. That is, the flexible printed circuit board 28 is adhered to one surface of the base plate 29, and the base plate 29 and the flexible printed circuit board 28 are provided with through holes reaching the lands of the wiring pattern. The base plate 29 is formed of a transparent or translucent synthetic resin such as polycarbonate, and is fixed to the back surface of the holding member 22 using an adhesive or the like. A part of the flexible printed board 28 projects from the base plate 29,
The protruding portion 28a is bent at a right angle so that the holding member 2
2 is stuck on the upper surface. At this time, the engagement pieces 28b, 2 protruding from both side edges of the flexible printed circuit board 28
8b is fitted into the trapezoidal grooves 22a, 22a formed on both sides of the upper surface of the holding member 22 to prevent the flexible printed circuit board 28 from floating from the holding member 22.

In the second embodiment constructed as described above, as shown in FIG. 6, both ends of each wire 26 are connected to a focus coil and tracking coil on the lens holder 20 side and a flexible printed board on the base plate 29 side. After soldering to the holding members 22, respectively.
Into the recess 23 from above, and the base plate 29
Is fixed to the back surface of the holding member 22 using an adhesive or the like, and the protruding portion 28a of the flexible printed circuit board 28 is attached to the upper surface of the holding member 22, thereby forming the recess 23 as shown in FIG. The upper surface and the rear surface except the front surface can be closed by the protruding portion 28a of the flexible printed circuit board 28 and the base plate 29, and the damper material 27 in a flowing state before gelation (hardening) is stored in the concave portion 23. be able to. Therefore, when soldering both ends of the wire 26, the holding member 22 does not become an obstacle, so that not only the assembling work including soldering work can be improved, but also the workability can be improved.
Since the upper open end of the recess 23 is closed by the thin flexible printed board 28, the holding member 22 can be made thinner.

In each of the above-described embodiments, the recess is described in which the upper surface, the front surface, and the back surface are opened. However, the recess may be formed by a notch in which the lower surface, the front surface, and the back surface are opened. Yes, in this case, the wire may be inserted into the recess from below the holding member.

In the second embodiment, the case where the flexible printed circuit board 28 is adhered to the base plate 29 has been described. However, if the required strength is secured, the flexible printed circuit board 28 can be omitted by omitting the base plate 29. The substrate 28 can be directly attached to the back surface of the holding member 22. In this case, there is an advantage that the number of components can be reduced.

[0022]

The present invention is embodied in the form described above and has the following effects.

A lens holder having an objective lens, a focus coil and a tracking coil mounted thereon, a plurality of wires having one end electrically connected to the focus coil or the tracking coil, and electrically connected to the other ends of the wires; And a holding member having a recess through which the wire is inserted, and a damper material filled in the recess, wherein the recess is one of upper and lower surfaces. When the remaining two surfaces except the front surface of the notch are closed by a closing member attached to the holding member, the focus coil, the tracking coil, and the wiring board are separated from each other. After soldering to both ends, assemble each wire into the recess from one of the upper and lower sides of the notch, If it closed by closure member remaining two surfaces except, for the fluidity of the damper material before curing can be accumulated in the recess, thereby improving the assembling workability including soldering.

When the function of the closing member is also used for the flexible printed circuit board to which each wire is soldered, the increase in the number of components can be suppressed and the holding member can be made thinner.

[Brief description of the drawings]

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

FIG. 2 is a side sectional view of the optical pickup of FIG. 1;

FIG. 3 is an exploded perspective view of main components provided in the optical pickup of FIG. 1;

FIG. 4 is a perspective view showing an assembled state of main parts of FIG. 3;

FIG. 5 is a side sectional view of an optical pickup according to a second embodiment of the present invention.

FIG. 6 is an exploded perspective view of main components included in the optical pickup of FIG.

FIG. 7 is a perspective view showing an assembled state of main parts of FIG. 6;

FIG. 8 is an external view showing a conventional optical pickup support mechanism.

FIG. 9 is a sectional view taken along line AA of FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 20 Lens holder 21 Objective lens 22 Holding member 23 Depression 24 Closure member 25 Flexible printed board 26 Wire 27 Damper material 28 Flexible printed board 29 Base plate

Claims (2)

[Claims] 1. A lens holder on which an objective lens, a focus coil and a tracking coil are mounted, a plurality of wires having one end electrically connected to the focus coil or the tracking coil, and an electrical wire connected to the other end of the wires. A wiring board, a holding member to which the wiring board is attached and having a recess through which the wire is inserted, and a damper material filled in the recess. An optical pickup supporting mechanism comprising a notch having three sides, a front face and a rear face, the remaining two faces excluding the front face of the notch being closed by a closing member attached to the holding member. . 2. A support mechanism for an optical pickup according to claim 1, wherein said wiring board comprises a flexible printed board, and said flexible printed board also serves as said closing member.