JP2002094191A - Flexible board and device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To overcome the problem in which the excess part of a flexible board is curved upward to interfere with the other member when a movable part is moved to induce excess in the flexible board in a case of connecting the flexible board between the movable part and a stationary part. SOLUTION: A movable part and a stationary part are connected together with a flexible board formed of elastic material so as to be shrinkable by its restoring force. The shrinkable part of the flexible board is formed like a spiral, by which the spiral is drawn out or taken up first when the flexible board is pulled out, so that the flexible board never interferes with the other members.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible board for wiring between a movable section and a fixed section, and an apparatus using the same.

[0002]

2. Description of the Related Art For example, in an optical pickup device such as a compact disk player for reproducing a data by focusing a light beam emitted from a light source such as a semiconductor laser on an information recording medium, the light beam is formed on a track of a disk. In order to read signal pits, the optical unit holding the laser device moves in the radial direction of the disk. For this reason, the movable optical unit and the fixed main circuit board are connected by a flexible board.

FIG. 7 shows the structure of the back surface of a conventional optical pickup device. 7, an optical unit 1 holding an objective lens and a laser device has one end held by a feed screw 2 and can be driven in the direction of arrow A. The feed screw 2 has one end rotatably supported by a bracket 4 formed on the chassis 3 and the other end rotatably supported by a resin bracket 5. Feed screw 2
A driven gear 6 is fixed to the other end of the driven gear 6.
The driving gear 8 rotatably supported by the motor bracket 7 meshes with the motor gear 7. Further, a belt 12 is stretched between a driven pulley 9 integrated with the driving gear 8 and a driving pulley 11 fixed to a rotating shaft of a driving motor 10. The disk motor 13 has a turntable fixed to a rotating shaft projecting to the rear side of the drawing, and holds a disk to be played between the turntable and the disk clamper. In addition, the flexible substrate 14 having one end connected to the optical unit 1 has a terminal 14a at the other end fixed to a main circuit board (not shown).

In the optical pickup device configured as described above, in an actual use mode, the back surface of the drawing shown in the drawing is the upper surface, and the disk mounted on the turntable is rotated by the disk motor 13. The feed screw 2 is rotated by the drive motor 10 via the drive pulley 11, the belt 12, the driven pulley 9, the drive gear 8, and the driven gear 6, and the optical unit 1 is driven from the inner circumference to the outer circumference of the disk. In the meantime, the laser device emits laser light by the power supply supplied to the optical unit 1 through the flexible substrate 14 and irradiates the disk surface through the objective lens, and receives the reflected light by the laser device through the objective lens. Then, the signal is converted into an electric signal, sent to the main circuit board through the flexible board 14, and the signal pits formed on the disk surface are read.

[0005]

However, in the above-mentioned conventional optical pickup device, when the optical unit 1 is at the innermost position as shown in FIG. While the relative distance between the fixing unit 15 and the fixing unit 15 is the longest, the relative distance between the optical unit 1 and the fixing unit 15 is the shortest when the optical unit 1 is at the outermost position (b). Become.
For this reason, the flexible substrate 14 is excessively slackened, and the slackened portion may be bent upward and protrude to interfere with other members. Therefore, it is necessary to cover the flexible substrate 14 in order to prevent the protrusion upward. .

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problem caused by the bending of the moving flexible substrate, and provides a flexible substrate which does not bend even when it moves.

[0007]

In order to solve the above-mentioned problems, a flexible substrate includes an elastic member joined to a flexible substrate main body, and expands and contracts by an elastic force of the elastic member. It is possible to realize a flexible substrate that does not bend and protrude even when moved.

Further, the flexible substrate of the present invention is characterized in that a leaf spring is joined to one or both surfaces of the flexible substrate main body, and realizes a flexible substrate which does not bend even when moved. Can be.

Further, the flexible substrate of the present invention is characterized by embedding a piano wire inside the flexible substrate main body, and can realize a flexible substrate which does not bend and protrude even when moved.

Further, the flexible substrate of the present invention is characterized in that it is formed in a spiral shape in a free state, and can sufficiently cope with a case where the distance between the movable part and the fixed part is long. Become.

Further, the flexible substrate of the present invention is characterized in that it is formed in a zigzag shape in a free state, and the width of the folded portion when contracted or expanded can be made constant.

The present invention is further characterized in that the movable portion and the fixed portion are electrically connected by using a flexible substrate formed so as to be able to expand and contract by the elastic force of an elastic member joined to the flexible substrate body. By using such a flexible substrate, it is possible to realize an electronic device in which the problem caused by the curved and protruding of the moved flexible substrate is eliminated.

The present invention is also directed to a method of driving a disk-shaped recording medium in a radial direction while holding an objective lens, irradiating the recording medium with a laser beam, converting reflected light from the recording medium into an electric signal, and outputting a signal. An optical unit for reading the data, and a flexible substrate connected to the optical unit for supplying electricity to the optical unit, wherein the flexible substrate is formed to be expandable and contractable by the elastic force of an elastic material joined to the flexible substrate body. By using such a flexible substrate, it is possible to realize an optical pickup device that does not require a cover for preventing a curved flexible substrate from moving and projecting.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of the back surface of the optical pickup device according to the embodiment of the present invention.
1 has the same configuration as that of the conventional example except for the flexible substrate, and the same members are denoted by the same reference numerals. In FIG. 1, one end of an optical unit 1 holding an objective lens and a laser device is held by a feed screw 2 and can be driven in the direction of arrow A. The feed screw 2 has one end rotatably supported by a bracket 4 formed on the chassis 3 and the other end rotatably supported by a resin bracket 5. A driven gear 6 is fixed to the other end of the feed screw 2, and a driven gear 8 rotatably supported by a motor bracket 7 meshes with the driven gear 6. Further, a belt 12 is stretched between a driven pulley 9 integrated with the driving gear 8 and a driving pulley 11 fixed to a rotating shaft of a driving motor 10. The disk motor 13 has a turntable fixed to a rotating shaft projecting to the rear side of the drawing, and holds a disk to be played between the turntable and the disk clamper. In addition, the flexible substrate 2
Reference numeral 4 denotes one end connected to the optical unit 1, the middle part spirally wound, and the other end pulled out in the horizontal direction to form a terminal part 24a. The terminal portion 24a is fixed to a main circuit board (not shown).

As shown in FIG. 2A, a flexible substrate 24 is formed by forming a wiring pattern 242 on a base film 241, such as polyester or polyimide, and coating the substrate with an insulating film 243 or a liquid resist. A thin plate spring 24B such as a spring steel plate or phosphor bronze is joined to 24A, and an insulating film 24C is further joined thereon, or as shown in FIG. 2 (b), two flexible substrate bodies 24A. Leaf spring 2
4B, or as shown in FIG. 2 (c), when a flexible board main body 24A is formed, a thin piano wire 24D embedded between wiring patterns 242 can be used. It is formed to be expandable and contractable by the elastic force of a leaf spring or a piano wire.

The flexible substrate 24 has a wiring pattern 242 formed on a base film 241 such as polyester or polyimide, and an insulating film 243 formed thereon.
Alternatively, a configuration in which only the base film 241 is used and the elastic force of the base film 241 alone is used without joining a leaf spring or the like may be employed.

The flexible substrate 24 of the present embodiment is
Since it is configured as described above, as shown in FIG.
When the optical unit 1 is at the innermost position (a), the flexible substrate 24 wound around the fixing portion 25 is pulled out by the optical unit 1 and the optical unit 1 is at the outermost position (b). This time, the flexible substrate 24 is automatically wound around the fixing portion 25 by its own elastic force. For this reason, the flexible substrate is excessively slackened as in the related art, and the slackened portion is curved and protrudes upward without interfering with other members, so that the cover is not necessary to prevent the protrusion from protruding upward. Become.

Note that the flexible substrate 24 in the above-described embodiment has the fixing unit 25
It is formed in a spiral shape so that the side is inside,
Like the flexible substrate 34 shown in FIG. 4, the optical unit may be formed in a spiral shape in a free state such that the optical unit side is inside and the fixed unit side is outside. In this case, if the contracted portion is formed so as to have a bamboo-like spring shape as in the case of the flexible substrate 44 shown in FIG. 5, pulling out and winding can be performed more easily. Further, if the contracted portion is formed to have a zigzag shape in a free state as in the flexible substrate 54 shown in FIG. 6, the width dimension W of the folded portion can be made constant.
Suitable when there are spatial constraints. In this case, the kuzuori may be oriented not in the vertical direction but in the horizontal direction.

Although the above embodiment is an example in which the flexible substrate of the present invention is used in an optical pickup device, it can be used in other electronic devices in which a moving unit and a fixed unit are connected by a flexible substrate. It has a similar effect.

[0020]

As described above, the flexible substrate of the present invention is characterized by being formed so as to be able to expand and contract by the elastic force of the elastic member. Can be realized.

The present invention is further characterized in that the movable portion and the fixed portion are electrically connected by using a flexible substrate which can be expanded and contracted by the elastic force of an elastic member joined to the flexible substrate body. By using such a flexible substrate, it is possible to realize an electronic device in which the problem caused by the curved and protruding of the moved flexible substrate is eliminated.

According to the present invention, a disk-shaped recording medium is driven in a radial direction while holding an objective lens, and the recording medium is irradiated with laser light to convert reflected light from the recording medium into an electric signal and read the signal. An optical unit comprising: an optical unit; and a flexible substrate connected to the optical unit for supplying power to the optical unit, wherein the flexible substrate is formed to be expandable and contractable by elastic force of an elastic material bonded to the flexible substrate body. It is a pickup device, and by using such a flexible substrate, it is possible to realize an optical pickup device that does not require a cover for preventing a curved flexible substrate from moving and protruding.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the configuration of the back surface of an optical pickup device according to an embodiment of the present invention.

FIG. 2 is a sectional view showing three different examples of a flexible substrate according to the embodiment of the present invention.

FIG. 3 is a schematic view showing the operation of the flexible substrate according to the embodiment of the present invention.

FIG. 4 is a perspective view showing another example of the flexible substrate according to the embodiment of the present invention.

FIG. 5 is a perspective view showing another example of the flexible substrate according to the embodiment of the present invention.

FIG. 6 is a perspective view showing another example of the flexible substrate according to the embodiment of the present invention.

FIG. 7 is a perspective view showing the configuration of the back surface of an optical pickup device in a conventional example.

FIG. 8 is a schematic view showing an operation of a flexible substrate in a conventional example.

[Explanation of symbols]

 Reference Signs List 1 optical unit 2 feed screw 3 chassis 4 bracket 5 resin bracket 6 driven gear 7 motor bracket 8 drive gear 9 driven pulley 10 drive motor 11 drive pulley 12 belt 13 disk motor 14, 24, 34, 44, 54 flexible substrate 15, 25 Fixed part 24A Flexible board body 24B Leaf spring 24C Insulating film 24D Piano wire

Claims (7)

[Claims] 1. A flexible substrate comprising an elastic member joined to a flexible substrate main body, wherein the flexible substrate expands and contracts by the elastic force of the elastic member. 2. A flexible substrate characterized in that a leaf spring is joined to one or both surfaces of a flexible substrate main body. 3. A flexible substrate characterized in that a piano wire is embedded inside a flexible substrate main body. 4. The flexible substrate according to claim 1, wherein the flexible substrate is formed in a spiral shape in a free state. 5. The flexible substrate according to claim 1, wherein the flexible substrate is formed in a zigzag shape in a free state. 6. An electronic device, wherein a movable portion and a fixed portion are electrically connected to each other by using a flexible substrate formed to be expandable and contractable by elastic force of an elastic member joined to a flexible substrate body. apparatus. 7. An optical system which is driven in a radial direction of a disk-shaped recording medium while holding an objective lens, irradiates the recording medium with a laser beam, converts reflected light from the recording medium into an electric signal, and reads a signal. A unit, and a flexible substrate connected to the optical unit for supplying power to the optical unit, wherein the flexible substrate is formed to be expandable and contractable by the elastic force of an elastic material joined to the flexible substrate body. Optical pickup device.