JP2719244B2 - Objective lens drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an objective lens driving device,
In particular, the present invention relates to a reproducing apparatus or an objective lens driving apparatus of a recording / reproducing apparatus which controls a track shift and a focus shift of a light spot focused on an information recording surface of an optical disk.

[0002]

2. Description of the Related Art FIGS. 6 to 8 are views for explaining a conventional objective lens driving device, and FIG.
7 is a partial plan view, and FIG. 8 is a vertical sectional view taken along line XX of FIG.

In FIG. 1, reference numeral 105 denotes a movable portion of the objective lens driving device 100; 114, an objective lens; 123, a counterweight; 122, a lens holder having a movable bearing 121; The movable bearing 121 is fitted to the support shaft 120 so as to be rotatable in the rotational direction and slidable in the axial direction. 126a, 126b are support rubbers for supporting the lens holder 122;
28b is a permanent magnet for focus control, 127a and 127b are permanent magnets for track control, 129a and 129b yoke for focus control, 124 is a coil for focus control, 125a and 125
b is a track control coil. Reference numeral 131 denotes a relay board, which connects the track control coils 125a and 125b and supplies coil leads 132a, 132b, 132c and 1 for supplying current to the focus control coil 124 and the track control coils 125a and 125b.
32d is wired. Reference numeral 130 denotes a base which also serves to hold and hold the support shaft 120 and the focus control permanent magnets 128a and 128b.

Next, the operation will be described. In the objective lens driving device 100 having the above-described configuration, the cylindrical movable bearing 121 is fitted to the support shaft 120, so that the lens holder 122 slides in the axial direction of the support shaft 120, that is, in the direction of arrow A in FIG. It is freely supported and is rotatably held about the support shaft 120 in the direction of arrow B in FIG.

Accordingly, by passing a desired current through the focus control coil 124, the focus can be controlled by moving the lens holder 122 in the direction of arrow A. Further, since the objective lens 114 is fixed to the lens holder 122 at a position away from the support shaft 120 by a predetermined distance, a desired current is applied to the track control coils 125a and 125b to move the lens holder 122 to the arrow B. The track control can be performed by rotating in the direction.

[0006]

As described above, the conventional objective lens driving device uses the relay board for the wiring of the coil. Therefore, the thickness and weight of the relay board reduce the thickness and weight of the movable part. On the other hand, there is a problem that it is harmful. In addition, the work of attaching the relay board to the lens holder at the time of assembly was required. There is an example in which an FPC is used in place of the relay board to make the movable section thinner and lighter, but it is necessary to attach the FPC to a lens holder during assembly.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an objective lens driving device which can be reduced in thickness and size and has good assembling workability. And

[0008]

According to the object lens driving device of the present invention, a lens holder is formed of non-conductive plastic and a metal piece is formed on the non-conductive plastic.
Is embedded so that a part thereof projects outside, and this projection
The unit is a relay unit for supplying power to the driving device .

[0009]

Since the objective lens driving device according to the present invention is constructed as described above, the rigidity of the lens holder can be increased. Therefore, the thickness and weight of the movable portion can be reduced. In addition, since the coil can be wired using the metal part protruding to the outside, the work of assembling the FPC or the relay board to the lens holder becomes unnecessary.

[0010]

[Embodiment 1] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 is an exploded perspective view, FIG. 2 is a partial plan view, and FIG. 3 is a longitudinal sectional view taken along line XX of FIG. In the figure, 1
10a, 110b, 110c, 110d and 110e are metal pieces integrally formed with non-conductive plastic,
One end of each of the tracking control coils 125a and 125b is soldered to the metal pieces 110a and 110b, and the metal piece 110c is integrally formed so as to penetrate the lens holder 122 as shown in FIG. The other ends of 125a and 125b are soldered. Also, the metal pieces 110d, 110e
Is connected to a focus control coil 124 by soldering. Then, the weight balance of the entire movable section including the lens holder is made to coincide with the drive center of the movable section. The same reference numerals as those of the conventional example indicate the same or corresponding members as those of the conventional example.

Since the objective lens driving device according to the present invention is configured as described above, the FPC or the relay board 131 is used.
The work of assembling the lens into the lens holder 122 is not required, and the assemblability is improved. Here, the used metal pieces 110a, 110b, 110c, 110d, 11
Copper, aluminum, or the like, which is easy to solder, is suitable as the material of 0e.

Embodiment 2 FIG. FIG. 4 is a diagram for explaining an embodiment to which the present invention is applied. In the drawing, a metal piece 110c is formed integrally with the lens holder 122 in a flat plate shape. With this configuration, the rigidity of the lens holder 122 can be increased because metal generally has a rigidity 10 times or more higher than that of plastic. Accordingly, the thickness of the movable portion 105 can be reduced, and the objective lens driving device 100 can be made thinner.
Miniaturization can be promoted.

Embodiment 3 FIG. Further, as shown in FIG. 5, the counterweight 123 can be omitted depending on the shape of the metal piece 110c.

[0014]

As described above, according to the present invention, the rigidity of the lens holder can be increased by integrally molding the lens holder with non-conductive plastic and a plurality of metals. Therefore, the thickness and weight of the movable portion can be reduced. In addition, since the coil can be wired using the metal part, the work of assembling the FPC or the relay board to the lens holder is not required.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an objective lens driving device according to a first embodiment of the present invention.

FIG. 2 is a partial plan view of FIG. 1 of the present invention.

FIG. 3 is a sectional view taken along line XX of FIG. 2 of the present invention.

FIG. 4 is a partial plan view showing an objective lens driving device according to a second embodiment of the present invention.

FIG. 5 is a partial plan view showing an objective lens driving device according to a third embodiment of the present invention.

FIG. 6 is an exploded perspective view showing a conventional objective lens driving device.

FIG. 7 is a partial plan view showing a conventional objective lens driving device.

FIG. 8 shows a conventional objective lens driving device,
It is X sectional drawing.

[Explanation of symbols]

100 Objective lens driving device, 110 Metal piece, 114
Objective lens, 122 lens holder, 126 support rubber.

Claims (1)

(57) [Claims] A lens holder for holding an objective lens;
An objective lens driving device comprising: a supporting rubber for elastically supporting the lens holder; and a driving device attached to the lens holder and driving the lens holder in an optical axis direction and in a direction perpendicular to the optical axis. Molded from a non-conductive plastic , and the non-conductive
A piece of metal sticks out of the plastic
And projecting the projecting part to feed the power to the drive unit
An objective lens driving apparatus is characterized in that the parts.