JP2529433Y2 - Optical pickup device - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention is supported movably in a direction crossing a signal track of a signal recording medium.
The present invention relates to an optical pickup device that transmits and receives electric signals using a flexible substrate.

[0002]

2. Description of the Related Art An optical pickup device for irradiating a signal surface of a signal recording medium such as a disk with a light beam to optically read or write a signal is provided with a focusing control of a light spot on the signal surface of the signal recording medium. And an objective lens driving mechanism for driving the objective lens in two directions perpendicular to the signal surface and in a direction perpendicular to the signal track to perform tracking control, and a light beam from a light source (mostly a laser diode). An optical path leading to the signal surface of the signal recording medium, and a light beam reflected by the signal surface,
In order to form an optical path leading to a photodetector for detecting information contained in a received light beam, the optical block base includes various optical components except an objective lens.

In such an optical pickup device, as shown in, for example, Japanese Utility Model Application Laid-Open No. 63-55265, a direction (tracking) that is guided by two parallel guide shafts and crosses a signal track of a signal recording medium. Direction).

An optical pickup device supplies a control signal for performing focusing control and tracking control of a light spot, supplies power to a laser diode serving as a light source, and supplies a control signal for controlling a light amount. Or, it is necessary to supply power to a photodetector for detecting a signal read from a signal recording medium, or to transmit a detection signal obtained from the photodetector,
It is necessary to exchange electric signals with a circuit formed on a printed circuit board fixed to the main body chassis. Therefore, in the optical pickup device, in order to transmit and receive the electric signal described above, for example, a practical example 2-101367 is used.
As disclosed in Japanese Patent Application Laid-Open No. H10-209, a flexible substrate formed by forming a conductive pattern on a resin film has been conventionally used as a transmission cable.

[0005]

By the way, the flexible substrate is not long enough so that the flexible substrate does not hinder the movement of the optical pickup device due to the entanglement of the flexible substrate or the cutting of the flexible substrate. It is better not to have, but when doing so, when the length of the flexible board becomes insufficient by moving the optical pickup device, a force is directly applied to the soldered portion of the flexible board, and the flexible board is The problem of easy tearing arises. Therefore, conventionally, a part of the flexible substrate is bonded to the optical pickup device so that a force is not directly applied to a soldered portion of the flexible substrate.

However, there is a problem that the peeling force generated by the movement of the optical pickup device often exceeds the limit of the bonding force of the bonding portion of the flexible substrate, and the bonding portion eventually peels off due to accumulation for a long time. there were.

[0007]

SUMMARY OF THE INVENTION The present invention is directed to an optical pickup device which has been made in view of the above points, and has a cover for covering an objective lens driving mechanism for dust prevention, and a side wall of the objective lens driving mechanism. A tongue cut and raised along with the tongue is provided, and the tongue is inserted into a flexible substrate forming a transmission line for transmitting and receiving an electric signal in accordance with the position of the tongue. A bulged portion having a hole is provided.

[0008]

According to the present invention, the bulging portion is folded so that a part of the flexible substrate is interposed in the gap between the side wall of the objective lens driving mechanism and the tongue, and the tongue is inserted into the hole of the bulging portion. A part of the flexible substrate is supported by an objective lens driving mechanism, and a force is directly applied to a soldering portion of the flexible substrate so that a force is applied to the supporting portion when the optical pickup device moves. The voltage is not applied, and the flexible substrate is surely supported without requiring a separate component.

[0009]

1 and 2 show an embodiment of the present invention, respectively, and are a development view from the front and an assembled view, respectively. FIG. 3 is a partially transparent plan view showing the entire optical pickup device according to the present invention.

First, the overall structure of the optical pickup device will be described with reference to the drawings.

The illustrated optical pickup device is configured by mounting an objective lens driving mechanism 2 for driving an objective lens 3 on an optical block base 1 in which various optical components (to be described in detail later) are incorporated. .

The optical block base 1 is made of aluminum die-cast, and is movable in the tracking direction of a signal recording medium such as a disk by guide shafts 4 and 5 arranged in parallel with each other.

The optical block base 1 includes a laser diode 6 as a light source for generating a light beam (laser light), a diffraction grating 7 for diffracting the light beam generated from the laser diode 6, and a diffraction grating. 7, a half mirror 8 composed of a parallel plate for splitting the optical path of the light beam passing through 7 and generating astigmatism for use in focus control, and the optical axis of the light beam reflected by the half mirror 8 at a right angle. A mirror 9 for reflecting the light beam on the objective lens 3 and a light detector for receiving the light beam reflected and modulated by the signal surface of the signal recording medium and transmitted through the half mirror 8 10 are attached.

On the other hand, the objective lens driving mechanism 2 has a lens holder 12 on which the objective lens 3 is mounted and which is displaceably supported by a plurality of support wires 11.
A focusing coil 13 wound around a side surface of the lens holder 12;
2 pairs of tracking coils 14 wound around the objective lens 3 so as to turn from the upper surface to the lower surface and return to the upper surface again.
And a pair of permanent magnets 15 and 16 having the same magnetic pole faces opposed to each other with the lens holder 12 interposed therebetween, and a magnetic pole face that is not opposite to the pair of permanent magnets 15 and 16. A magnetic circuit comprising a yoke 17 formed to surround the lens holder 12,
Focusing coil 13 and tracking coil 14
The objective lens 3 can be driven in the focusing direction and the tracking direction according to the control current supplied to the objective lens 3.

In the objective lens driving mechanism 2 , a printed circuit board 19 having a land on which a plurality of support wires 11 are soldered is fixed on one side in the longitudinal direction of the frame 18, and the printed circuit board 19 is fixed on the other side. Support member 2 having a hole (not shown) formed at a position corresponding to support wire 11
0 is fixed.

One end of each of the plurality of support wires 11 is fixed to the printed circuit board 19 by soldering, and the other end is inserted into a corresponding hole of the support member 20 to be slidably supported. Are stretched parallel to each other in the longitudinal direction. A lens holder 12 is fixed to an intermediate portion of each of the support wires 11.

A focusing coil 13 and a tracking coil 14 are connected to the predetermined supporting wires 11, respectively.
A control signal is supplied to the focusing coil 13 and the tracking coil 14 through the flexible board 21. A flexible board 21 is connected to the printed board 19 by soldering. Through the focusing coil 1
3 and a control signal to be supplied to the tracking coil 14, respectively.

The objective lens driving mechanism 2 is configured so that the upper part is covered with a dustproof cover 22 formed by pressing a steel plate. The cover 22, in addition to the bent piece 23 for engaging the objective lens driving mechanism 2, a rectangular tongue 24 with rounded corners is raised outright along the side wall of the objective lens driving mechanism 2 It is formed. The tongue piece 24 is an objective lens driving mechanism.
A small gap is formed between the two side walls.

On the other hand, the flexible board 21 is provided with a bulging portion 25 that protrudes corresponding to the position of the tongue piece 24. In the bulging portion 25, two long and short slits 26 and 27 having different lengths are formed in parallel.

Next, a method for supporting the flexible substrate 21 on the optical pickup device will be described.

At first, the flexible substrate 21 is
The bent portion 25 is bent from the constricted portion (broken line portion in FIG. 1) so that the bulged portion 25 overlaps the main body portion of the flexible substrate 21. Here, a pattern of copper foil is formed on the bulging portion 25 according to its shape. Therefore, the bulging portion 25 is held with a spring property when the folded state is opened to some extent.

[0022] After that, the cover 2 to the objective lens drive mechanism 2
2, but in this case, as shown in FIG.
A part of the flexible substrate 21 which is folded back is interposed in the gap between the side wall of the objective lens drive mechanism 2 and the tongue piece 24 of the cover 22 and the two slits 26 and 27 of the bulging portion 25 The tongue piece 24 is inserted.

As described above, the flexible substrate 21
The tongue piece 24 of the cover 22 supports the optical pickup device. In this state, the slit 2
The flexible substrate 21 is reliably supported by the insertion of the tongue pieces 24 into the protrusions 6 and 27 and by the spring property of the bulging portion 25 being folded back. Therefore, the support portion of the flexible substrate 21 does not come off due to the movement of the optical pickup device.
1 is displaced with the supporting portion as a fulcrum, and it is prevented that a force is directly applied to a portion of the flexible substrate 21 soldered to the printed circuit board 19.

The flexible substrate supported by the optical pickup device is a focusing coil 1 as in the embodiment.
The power supply is not limited to the flexible substrate 21 for transmitting the control signal to be supplied to the optical block base 1 and the tracking coil 14. It may be used for a flexible substrate for transmitting signals.

[0025]

As described above, according to the present invention, the bulging portion is folded back so that a part of the flexible substrate is interposed in the gap between the side wall of the objective lens driving mechanism and the tongue.
Since the tongue piece is inserted into the hole of the bulging portion, a part of the flexible substrate can be reliably supported by the objective lens driving mechanism without requiring a separate component, and the movement of the optical pickup device can be improved. Thereby, it is possible to effectively prevent the soldered portion of the flexible board from peeling or tearing.

[Brief description of the drawings]

FIG. 1 is an exploded view from the front showing one embodiment of the present invention.

FIG. 2 is an assembled view of FIG. 1;

FIG. 3 is a partial perspective plan view showing the entire optical pickup device according to the present invention;

[Description of Signs] 1 Optical block base 2 Objective lens driving mechanism 3 Objective lens 19 Printed circuit board 21 Flexible board 22 Cover 24 Tongue piece 25 Swelling part 26, 27 Slit (hole)

Claims (1)

(57) [Scope of request for utility model registration] 1. A transmission line for transmitting and receiving an electric signal is formed by a flexible substrate and supported so as to be movable in a direction crossing a signal track of a signal recording medium.
In an optical pickup device in which an objective lens driving mechanism for driving an objective lens is covered with a dustproof cover, the cover is provided with a tongue piece cut and raised along a side wall of the objective lens driving mechanism. The flexible substrate is provided with a bulging portion having a hole formed thereon, the bulging portion corresponding to the position of the tongue piece, and the bulging portion is folded back so that a part of the flexible substrate is formed on the side wall of the objective lens driving mechanism. An optical pickup that is interposed in a gap between the tongue and the tongue inserted into a hole of the bulging portion to support a part of the flexible substrate by an objective lens driving mechanism. apparatus.