JPH0944896A - Optical pickup device - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide an optical pickup device for use in a compact disc player or the like, in which the grating laser element can be adjusted easily and reliably. [Structure] The hologram laser element 2 is inserted into a hole 4 formed in a base 1, and the hologram laser element 2 is pressed against the substrate 1 by a U-shaped holding metal fitting 12. By rotating with respect to the axis,
The grating adjustment of the hologram laser element 2 is easily and reliably performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup device used in an optical recording / reproducing device such as a compact disc player.

[0002]

2. Description of the Related Art FIG. 5 shows a base portion of a conventional optical pickup device. In FIG. 5, reference numeral 1 is a substrate, which is guided by a shaft and moves in the radial direction of the compact disc. Reference numeral 2 denotes a hologram laser element, and the hologram laser element 2 accommodates a light emitting element that generates a laser beam and a light receiving element. The hologram 3 is provided on the front surface of the hologram laser element 2. 4 is a hole formed in the side portion of the substrate 1,
The hologram laser element 2 is inserted into the hole 4.
Reference numeral 5 denotes a mounting metal fitting for fixing the hologram laser element 2 to the substrate 1. By inserting a screw 6 into a hole 7 of the mounting metal 5 and screwing the screw 6 into a screw hole 8 of the substrate 1, the hologram laser element 2 is It is fixed to the substrate 1. Reference numeral 9 denotes a mirror which is attached to be inclined near the center of the substrate 1. The laser light output from the hologram laser element 2 is reflected upward by the mirror 9, and the reflected light reflected by the compact disc is reflected by the mirror 9. It is reflected and enters the hologram laser element 2.

When the hologram laser element 2 is inserted into the hole 4 of the substrate 1, the hologram laser element 2 is rotated with respect to the optical axis to perform the grating adjustment. When the adjustment is completed, the mounting bracket 5 is attached. It is used to fix the hologram laser element 2 to the substrate 1.

[0004]

However, in the above-mentioned conventional example, the hologram laser element 2 is inserted into the hole 4 of the substrate 1 and is rotated with respect to the optical axis to adjust the grating, and then the hologram is mounted on the mounting metal fitting 5. There is a problem that the adjustment is deviated when the laser element 2 is fixed to the substrate 1.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide an excellent optical pickup device capable of easily and surely performing the grating adjustment.

[0006]

In order to achieve the above object, the present invention provides a hole formed in a substrate for holding an objective lens actuator, a hologram laser element inserted in the hole, and an elastic plate material. And a U-shaped holding metal member in which legs facing each other are formed on both sides of the substrate portion, and both end portions of the hologram laser device are pressed against the substrate by the U-shaped pressure metal member. It is what

[0007]

The present invention has the above-mentioned structure, and the hologram laser element inserted in the hole of the substrate is adjusted by pressing the substrate with the U-shaped holding metal fittings. Easily without slipping
And it can be done reliably.

[0008]

1 to 4 show an optical pickup device according to an embodiment of the present invention. 1 to 4, the same parts as those in the conventional example are denoted by the same reference numerals. FIG.
In the figure, 1 is a substrate, and the hologram laser element 2, the objective lens actuator 10, the mirror 9 and the like are attached to the substrate 1. 11 is a hologram laser element 2
Is a flexible printed circuit board on which a land to which the terminal is connected is formed.

FIG. 2 shows a portion of the substrate 1, in which the hologram laser element 2 is inserted into the hole 4 of the substrate 1 and then the hologram laser element 2 is pressed against the substrate 1 by the U-shaped holding metal fitting 12. . The holding metal fitting 12 is formed by bending an elastic plate material and, as shown in FIG. 3, has two legs 1 at both ends of one side of the base plate portion 12a.
2b and 12c are integrally formed, and two legs 12d and 12e are integrally formed at both ends of the other side of the substrate portion 12a. The legs 12d and 12e are formed with protrusions 12f and 12g that are curved in the directions of the legs 12b and 12c. The legs 12b and 12d and the legs 12c and 12e face each other to form a sandwiching portion. Leg 1 of the above-mentioned press fitting 12
2b and 12c are inserted into the holes 13a and 13b of the substrate 1, and the other legs 12d and 12e are inserted into the bottom surface of the hologram laser element 2. At this time, the hologram laser element 2 is pressed against the substrate 1 by the elastic force of the pressing fitting 12. In this state, the hologram laser element 2 is rotated about its optical axis to perform the grating adjustment, and when the adjustment is completed, the hologram laser element 2 is fixed to the substrate 1 with an adhesive. After fixing the hologram laser element 2 to the substrate 1, the terminals of the hologram laser element 2 and the lands of the flexible printed board 11 are soldered.

FIG. 4 shows an objective lens actuator 10. In FIG. 4, reference numeral 20 denotes a base made of a magnetic metal plate, and magnet holding pieces 21a and 21b protruding in a rectangular parallelepiped shape are provided at opposite ends of the base 20 so as to face each other. Reference numerals 22a and 22b are rectangular parallelepiped magnets mounted inside the magnet holding pieces 21a and 21b, respectively, and 23a and 23b are base 20.
Is a rectangular parallelepiped-shaped magnetic path piece formed by bending a part of the magnetic field pieces 23a and 23b.
The magnet 22 is spaced at a constant distance from a and 22b.
It is provided so as to face a and 22b. Reference numeral 24 is a damping member holding substrate attached to the outside of the magnet holding piece 21b. A concave portion 25 is formed on one surface of the damping member holding substrate 24. A gel damping member is accommodated in the concave portion 25. There is. Reference numeral 26 is a base placed outside the damping member holding substrate 24. The base 26 is a flexible printed circuit board 26a.
And a reinforcing plate 26b for reinforcing the flexible printed circuit board 26a. 27 is a wire rod, and one end of the wire rod 27 is inserted into a through hole formed in the damping member holding substrate 24, a hole formed in the reinforcing plate 26b, and a hole formed in the flexible printed board 26a, The flexible printed circuit board 26
It is soldered and fixed to the land a. An objective lens holder 28 is fixed to the other end of the wire 27, and the objective lens holder 28 is movably supported by the wire 27. Reference numeral 29 is an objective lens held on the upper surface of the objective lens holder 28. A focusing control coil 30 is wound around the outer peripheral surface of the objective lens holder 28, and a ring-shaped tracking control coil 31 is provided on the outer peripheral surface of the objective lens holder 28 facing the magnets 22a and 22b. Is fixed. The magnets 22a and 22b and the magnet holding pieces 21a and 21
b, the base 20, and the magnetic path pieces 23a and 23b respectively form a magnetic circuit, and the focusing control coil 30 and the tracking control coil 31 are arranged in the magnetic gap of the magnetic circuit. The wire rod 27
Is connected to the focusing control coil 30 and the tracking control coil 31. When a focus error signal is applied to the focusing control coil 30 via a wire rod, the objective lens holder 28 causes the objective lens 29 to move. When the tracking error signal is applied to the tracking control coil 31, the objective lens holder 28 is driven in the tracking direction orthogonal to the optical axis direction of the objective lens 29, and the objective lens holder 28 is driven. The position of the lens 29 is controlled. Reference numeral 32 is a cover attached to the objective lens holder 28.

Objective lens actuator 10 shown in FIG.
Is attached to the substrate 1 with screws 33 as shown in FIG. The laser light emitted from the hologram laser element 2 is reflected by the mirror 9, and the objective lens actuator 10
The light enters the objective lens 29 from the lower surface of and is focused on the compact disc. The reflected light reflected by the compact disc travels in the opposite direction of the optical path and enters the hologram laser element 2.

As described above, in the above embodiment, the hologram laser element 2 is inserted into the hole 4 of the substrate 1 and then the grating adjustment is performed while the hologram laser element 2 is pressed by the U-shaped holding metal fitting 12. Since the pressing metal fitting 12 is used for pressing, the adjustment does not shift after the grating adjustment. Further, when the U-shaped pressing metal fitting 12 is used, the hologram laser element 2 can be fixed to the base 1 with one touch.

[0013]

As is apparent from the above-described embodiment, the present invention is configured so that the grating laser device is configured to adjust the grating with both ends of the hologram laser device being pressed against the substrate by the bracket. It has an advantage that adjustment can be performed easily and surely.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an optical pickup device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a board portion of the embodiment.

FIG. 3 is a perspective view of a holding metal fitting of the embodiment.

FIG. 4 is an exploded perspective view of the objective lens actuator of the same embodiment.

FIG. 5 is an exploded perspective view of a main part of a conventional optical pickup device.

[Explanation of symbols]

 1 substrate 2 hologram laser element 3 hologram 4 hole 12 U-shaped holding metal fitting 12a substrate part 12b to 12e leg

Claims (1)

[Claims] 1. A hole formed in a substrate for holding an objective lens actuator, a hologram laser element inserted in this hole, and a leg made of a plate material having elasticity and facing each other on both sides of the substrate portion. An optical pickup device comprising: a U-shaped pressing member, wherein both ends of the hologram laser element are pressed against the substrate by the U-shaped pressing member.