JPH10188307A - Optical pickup device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an objective lens driving part for driving an objective lens for converging a laser beam on an optical disk small-sized and thin structive in the optical pickup device for recording and reproducing information on the optical disk. SOLUTION: Lead wires of focus coil 5 and a track coil 6 assembled in a lens holder 22 of the objective lens driving part are wired along a guide groove 52 provided in the lens holder 22 and soldered to lead terminals 51 of a relay substrate 28 fitted to position the lead terminals 51 of the relay substrate on the side of a suspension holder 4. Consequently, the whole objective lens driving part is miniaturized and is also thin structive.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an objective lens driving section of an optical pickup device used in an optical disk drive for optically recording and reproducing information such as a compact disk or a DVD.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for compact disks and laser disks as recording media for audio and video, and optical disks such as CD-ROMs for recording computer data. In recent years, the development of high-density optical media such as MO and DVD has been remarkable, and further market expansion is expected. This optical disk has a recording layer in which a metal thin film such as aluminum is deposited on a synthetic resin substrate.For reproduction, a laser beam is applied to the recording layer, and reflected light is received by a light receiving unit such as a photodiode. This is performed by converting an optical signal into an electric signal. The spot of the laser beam is much larger than the pit on the optical disk,
It must be focused by a lens. Also, since the optical disk is rotating, in order to focus on each of the pits present on the optical disk, move the lens position so that the distance between the lens and the optical disk is always constant. I have to adjust. The above-described adjustment is generally performed by an object having a function of moving a lens portion called an objective lens driving portion by electromagnetic force.

Hereinafter, an objective lens driving section of a conventional optical pickup device will be described with reference to FIGS. FIG. 8 is a top view of an objective lens driving unit of the conventional optical pickup device, and FIG. 9 is a side view of the objective lens driving unit of the conventional optical pickup device. 8 and 9, a laser beam emitted from a laser diode is guided to an objective lens 1, a lens holder 2 holding the objective lens 1 is cantilevered by a plurality of suspension wires 3, and the other end is a suspension holder. 4, the flexible printed circuit board 7 adhered to the suspension holder 4 and the suspension wire 3 are soldered to supply current to the focus coil 5 and the track coil 6 assembled in the lens holder 2. In addition, the other end of the suspension wire 3 is soldered to the relay board 8 assembled on the lens holder 2, and the lead wires of the relay board 8, the focus coil 5 and the track coil 6 are moved further than the soldering position of the suspension wire 3. Release from suspension holder 4 By soldering to the relay substrate 8 on the other side, current flows through the focus coil 5 and the track coil 6, and the electromagnetic action of the magnet 9 drives the lens holder 2 in the focus direction and the track direction of the optical disc. The condensed laser light follows the signal surface of the optical disk to record and reproduce information on the optical disk.

[0004]

In order to prevent the coil lead wire from physically interfering with the suspension wire,
The soldering position of the suspension wire on the relay board is on the suspension holder side, and the soldering position of the coil lead wire on the relay board is on the side farther from the suspension holder. Is limited by the size of the substrate, making it difficult to reduce the size and thickness. In addition, since the positioning of the relay board was performed using the outer surface other than the land where the relay board was soldered, the dimensional error of the relay board itself affected the length of each suspension wire, and the objective lens driver However, there is a problem that the tilt characteristics and the frequency characteristics are deteriorated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and is small, thin, and lightweight by reducing restrictions on miniaturization and thinning of a lens holder determined by the shape of a relay board. It is another object of the present invention to provide an optical pickup device in which a suspension wire has a uniform length without requiring a high dimensional accuracy of the relay substrate itself.

[0006]

In the objective lens driving section of the optical pickup device according to the present invention, the relay board is substantially T-shaped, and has a first terminal at both ends of the horizontal axis and a vertical axis along the vertical axis. And the second terminal is disposed on the holding portion such that the distance between the second terminal and the base is shorter than the distance between the first terminal and the base, and holds the lead wire of the driving portion. It is wired along the groove provided in the portion.

According to the present invention, a compact, thin, and light optical pickup device can be obtained by reducing the restrictions on miniaturization and thinning of the lens holder determined by the shape of the relay board.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, there is provided a light source for emitting laser light, a lens for condensing the laser light emitted from the light source, and a driving unit for driving the lens. A holding unit that holds the lens and the driving unit, a base that supports the holding unit via a suspension wire, and a base that is disposed on the holding unit and that is connected to the base wire and the driving unit. An optical pickup device having a substrate connected to a lead wire and supplying electricity to the driving unit through the wire, wherein the substrate is substantially T-shaped, and has a first terminal at both ends of a horizontal axis and a first terminal along a vertical axis. And a second terminal on a vertical axis portion, and is arranged on the holding portion such that a distance between the second terminal and the base is shorter than a distance between the first terminal and the base. The holding unit is connected to the lead wire of the driving unit based on the lead wire. Are those grooves for wiring provided on, and has the effect that the lens holder without changing the length of the suspension wire can be downsized.

According to a second aspect of the present invention, the substrate is substantially cross-shaped having a major axis and a minor axis, and has terminals at each end.
The substrate is attached to the holding portion in such a manner that the major axis direction of the substrate indicates the base, and has an effect that the lens holder can be reduced in size and thickness without changing the length of the suspension wire. .

According to a third aspect of the present invention, the holding portion has a step at which the substrate abuts at a predetermined position on the outer side surface.
Or 2, wherein the uniformity of the length of the suspension wire is hardly influenced by the accuracy of the relay board itself.

According to a fourth aspect of the present invention, the holding portion has a convex portion at which the substrate abuts at a predetermined position on the outer side surface.
Or 2, wherein the uniformity of the length of the suspension wire is hardly influenced by the accuracy of the relay board itself.

(Embodiment 1) FIGS. 1 to 3 show an objective lens driving section of an optical pickup device according to Embodiment 1 of the present invention.
It will be described based on. FIG. 1 is a perspective view of an objective lens driving unit of an optical pickup device according to Embodiment 1 of the present invention.
FIG. 2 is a top view of an objective lens driving unit of the optical pickup device according to the first embodiment of the present invention, and FIG. 3 is a side view of the objective lens driving unit of the optical pickup device according to the first embodiment of the present invention. Components similar to those of the conventional optical pickup device will be described using the same reference numerals.

In the figure, reference numeral 28 denotes a substantially T-shaped relay board.
The relay board 28 is provided with two lead terminals 51 along the axial direction at the central longitudinal axis, and wire terminals 50 at both ends along the horizontal axis. The wire terminal 50 extends to an end surface in the vertical axis direction of the horizontal axis portion of the relay board 28. The relay board 28 is made of an organic or inorganic material such as paper phenol, polyimide resin, glass epoxy resin, or ceramic. Reference numeral 22 denotes a lens holder for holding the objective lens 1. The lens holder 22 is provided with a step 53 for abutting the end surface of the wire terminal 50 of the relay board 28 at a predetermined position on the side surface of the lens holder 22.
Is smaller than the thickness of the relay board 28, and a guide groove 52 for guiding the lead wire is provided continuously to the open end face and the outer side face of the lens holder 22, and the position of the guide groove 52 on the outer side face is a stepped portion. On the opposite side of 53, the lead wire is the lens holder 2
It suffices if the depth is not outside the icicle plane.

The laser beam emitted from the laser diode is guided to the objective lens 1, and the lens holder 22 holding the objective lens 1 is cantilevered by each of the four suspension wires 3. Is held by a suspension holder 4. In order to supply current to the focus coil 5 and the track coil 6 assembled in the lens holder 22, the flexible printed circuit board 7 fixed to the suspension holder 4 with an adhesive, soldering, a stopper or the like.
And the suspension wire 3 are soldered, and the other end of the suspension wire 3 is soldered to the wire terminal 50 of the relay board 28 attached to two places on the side surface of the lens holder 22 with an adhesive. In order to solder the lead terminals 51 and the lead wires of the focus coil 5 and the track coil 6, the lead wires of the focus coil 5 and the track coil 6 are formed along the respective guide grooves 52 provided on the upper surface and side surfaces of the lens holder 22. It is pulled out to the vicinity of the center of the relay board 28 in the focus direction outside the lens holder 22 and is passed between the wire terminals 50 and soldered to the lead terminals 51 of the relay board 28. At this time, the relay board 28 is attached such that the lead terminal 51 is closer to the suspension holder 4 than the wire terminal 50 and the end of the wire terminal 50 is in contact with a step 53 provided on the lens holder 22. As a result, the distance from the end surface of the suspension holder 4 to the end surface of the relay board 28 can be reduced without changing the length of the suspension wire 3, thereby reducing the length of the lens holder 2.
The length of the suspension wire 3 in the axial direction is also reduced, and the size of the objective lens driving unit can be reduced. In addition, the accuracy of the position where the lens holder 22 is supported by the suspension wire 3 can be improved, and the accuracy of the length of the suspension wire 3 can be improved.

In the first embodiment, the outer side surface of the guide groove 52 of the lens holder 22 has a groove shape that is continuous with the open end surface. However, a step portion along which the lead wire extends may be used.

(Embodiment 2) The objective lens driving section of the optical pickup device according to Embodiment 2 of the present invention is shown in FIGS.
It will be described based on. FIG. 4 is a top view of an objective lens driving unit of the optical pickup device according to the second embodiment of the present invention, and FIG. 5 is a side view of the objective lens driving unit of the optical pickup device according to the second embodiment of the present invention. Components similar to those of the conventional optical pickup device will be described using the same reference numerals.

In the drawing, reference numeral 38 denotes a substantially cross-shaped relay board.
The relay substrate 38 is provided with lead terminals 61a and 62b at both ends of a central long axis portion, and is provided with wire terminals 60 at both ends of a short axis portion. Reference numeral 32 denotes a lens holder for holding the objective lens 1. The lens holder 32 is provided with a step 63 for abutting the end surface of the wire terminal 60 of the relay board 38 at a predetermined position on the side surface of the lens holder 32. The thickness is smaller than the thickness of the relay board 38, and the guide groove 62 for guiding the lead wire is
The guide groove 64 is continuously provided on the open end face of the lens holder 32 on the lead terminal 61a side on the open end face of the lens holder 32 on the lead terminal 61b side. It is sufficient if the depth is not outside the icicle plane.

The laser light emitted from the laser diode is guided to the objective lens 1, and the lens holder 32 holding the objective lens 1 is cantilevered by each of the four suspension wires 3. Is held by a suspension holder 4. In order to supply current to the focus coil 5 and the track coil 6 assembled in the lens holder 32, the flexible printed circuit board 7 fixed to the suspension holder 4 with an adhesive, soldering, a stopper or the like.
And the suspension wire 3 are soldered, and the other end of the suspension wire 3 is soldered to the wire terminals 60 of the relay board 38 attached to two places on the side of the lens holder 32, and further, the lead terminals 61a of the relay board 38 , 61b and the lead wires of the focus coil 5 and the track coil 6 are soldered along the guide grooves 62 and 64 provided in the lens holder 32, respectively. It is pulled out outside the vicinity of the center of the relay board 38 in the focus direction, and soldered to the lead terminals 61 of the relay board 38. At this time, the relay board 38 is attached such that an end of the wire terminal 60 abuts on a step 63 provided on the lens holder 32. As a result, the distance from the end surface of the suspension holder 4 to the end surface of the relay board 38 is reduced without changing the length of the suspension wire 3, thereby shortening the axial length of the suspension wire 3 of the lens holder 32 and reducing the objective. The size of the lens driving unit can be reduced. Further, since the number of patterns passing between the wire terminals 60 of the relay board 38 is reduced, the interval between the wire terminals 60 can be reduced, and the length of the lens holder 32 in the optical axis direction of the objective lens 1 can be reduced. The lens drive section can be made thinner. In addition, the accuracy of the position where the lens holder 32 is supported by the suspension wire 3 is improved, and the accuracy of the length of the suspension wire 3 can be improved.

(Embodiment 3) FIGS. 6 and 7 show an objective lens driving section of an optical pickup device according to Embodiment 3 of the present invention.
It will be described based on. FIG. 6 is a top view of the objective lens driving unit of the optical pickup device according to the third embodiment of the present invention, and FIG. 7 is a side view of the objective lens driving unit of the optical pickup device according to the third embodiment of the present invention. In the figure,
Reference numeral 42 denotes a lens holder for holding the objective lens 1. The lens holder 42 is provided with a columnar convex portion 73 for abutting the end surface of the wire terminal 50 of the relay board 28 at a predetermined position on the side surface of the lens holder 42. The height of 73 is smaller than the thickness of the relay board 28, and the guide groove 72 for guiding the lead wire is provided continuously on the open end face and the outer side face of the lens holder 42, and the lead wire is higher than the flat face of the lens holder 42. It is only necessary to have a depth that is not outside.

The electrical connection of the lead wires of the focus coil 5 and the track coil 6 to the lead terminals 51 of the relay board 28 is made in the same manner as in the first embodiment, and the positioning of the lens holder 42 and the relay board 28 is performed by the relay. By pressing the end surface of the wire terminal 50 of the substrate 28 on the suspension holder 4 side against the projection 73 provided on the lens holder 42, the suspension wire of the lens holder 42 is independent of the accuracy of the relay substrate 28 itself. 3, the accuracy of each supporting position is improved, and the length of the suspension wire 3 can be made uniform.

In the third embodiment, the implementation is performed using the relay board 28 of the first embodiment, but the same implementation may be similarly performed using the relay board 28 of the second embodiment. Further, in the third embodiment, the shape of the convex portion 73 is a columnar shape, but the shape is not particularly limited to this and may be a columnar shape without any problem, and the number may be one.

[0022]

As described above, in the objective lens driving section of the optical pickup device of the present invention, it is possible to reduce the size and thickness of the lens holder, and to reduce the size and thickness of the entire optical pickup device. In addition, there is an excellent effect that the operation sensitivity is improved because the movable portion is reduced in weight, that the followability is improved, and that power can be saved.

[Brief description of the drawings]

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

FIG. 2 is a top view of an objective lens driving unit of the optical pickup device according to the first embodiment of the present invention.

FIG. 3 is a side view of an objective lens driving unit of the optical pickup device according to the first embodiment of the present invention.

FIG. 4 is a top view of an objective lens driving unit of the optical pickup device according to the second embodiment of the present invention.

FIG. 5 is a side view of an objective lens driving unit of the optical pickup device according to the second embodiment of the present invention.

FIG. 6 is a top view of an objective lens driving unit of an optical pickup device according to a third embodiment of the present invention.

FIG. 7 is a side view of an objective lens driving unit of an optical pickup device according to a third embodiment of the present invention.

FIG. 8 is a top view of an objective lens driving unit of a conventional optical pickup device.

FIG. 9 is a side view of an objective lens driving unit of a conventional optical pickup device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Objective lens 2, 22, 32, 42 Lens holder 3 Suspension wire 4 Suspension holder 5 Focus coil 6 Track coil 7 Flexible printed board 8, 28, 38 Relay board 9 Magnet 10 Yoke 50, 60 Wire terminal 51, 61a, 61b Lead Terminals 52, 62, 64, 72 Guide grooves 53, 63 Steps 73 Projections

Claims (4)

[Claims] A light source for emitting laser light, a lens for condensing the laser light emitted from the light source, a driving unit for driving the lens, and a holding unit for holding the lens and the driving unit. A base for supporting the holding unit via a suspension wire, a base disposed on the holding unit, connecting the base wire and the lead of the driving unit, and supplying electricity to the driving unit through the wire. An optical pickup device having a substrate to be supplied, the substrate having a substantially T shape, having a first terminal at both ends of a horizontal axis and a second terminal at a vertical axis along the vertical axis, And, the second terminal and the base are disposed on the holding portion such that the distance between the first terminal and the base is shorter than the distance between the first terminal and the base. Grooves for wiring on the board are provided The optical pickup apparatus according to claim. 2. The substrate has a substantially cross-shaped configuration having a major axis and a minor axis, and has terminals at each end, and the substrate is placed on a holding portion such that the major axis direction of the substrate indicates a base. The optical pickup device according to claim 1, wherein the optical pickup device is attached. 3. The holding part has a step at which a substrate abuts at a predetermined position on an outer side surface.
An optical pickup device as described in the above. 4. The holding portion has a projection at a predetermined position on the outer side surface, the projection abutting on the substrate.
An optical pickup device as described in the above.