JPS5940350A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent the damage of a belt type flexible cable despite of the repetition of reciprocating motions, by attaching the flexible cable with its center part bent into a U shape along the head shifting direction and at the position near a head shifting mechanism. CONSTITUTION:A disk revolving motor 2 is revolved to revolve a disk 4 at a constant speed. Under such conditions, the driving power and control signal are supplied to a head shifting mechanism 6, an optical head 14 and an actuator 15 via flexible cables 20 and 21. Thus the head 14 and the actuator 15 shift in the disk radius direction in response to the movement of a carriage 6B and at the same time perform optical record or reproduction to the record track of the disk 4. In this case, flexible cables 20-23 have deformations in response to the movement of the carriage 6B. However these cables can move smooth with deformations with a small load to the mechanism 6 since they are very thin and flexible.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for optically recording and reproducing information such as images on a disk-shaped recording medium (hereinafter referred to as a disk) using an optical head, and particularly relates to a head and a head. This invention relates to the configuration of a cable that supplies power and sends/receives signals to a transmission mechanism.

Conventional devices of this type use a voice coil-driven head transport mechanism to move an optical head in the radial direction of the disk to form concentric or spiral recording tracks on the disk, thereby recording or reproducing information. There is something that is configured to do this. What happens to a device with such a configuration?
Since the head is linearly reciprocated by a chair coil, electric power is supplied to the head and the head transport mechanism, and signals are sent and received using flexible electric wires. In this case, in most conventional devices, a cable made by bundling a plurality of vinyl-coated conducting wires or the like is used as the electric wire. However, in cables using such cables, the vinyl coating and core wire are likely to be damaged due to bending stress caused by the reciprocating motion of the head. Further, since the wire body has a relatively large volume and weight, a relatively large wiring space is required, and the load on the head feeding mechanism is large, which may impede the head feeding operation. Furthermore, there are also other drawbacks such as poor connectivity to a printed wiring board attached to the optical head and the need for wiring.

The present invention has been made in consideration of the above circumstances, and its purpose is to prevent damage even if the reciprocating operation is repeated, to require only a small amount of wiring space, and to provide a device for the head feeding mechanism. It is an object of the present invention to provide a recording and reproducing device equipped with a flexible cable that has a small load and is easy to connect to a printed wiring board.

Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the drawings.

1 to 3 are a top view, a side view, and a rear end view, respectively, showing the configuration of an embodiment of the present invention.

In Figures 1 to 3, 1 is a large mounting plate made of metal such as aluminum.
A disk rotation drive motor 2 is installed vertically on this pace. A disk 4 is placed on the upper surface of a disk mounting table 3 attached to the rotating shaft of the motor 2, and is fixed by a disk-shaped disk holding plate 5.

On the other hand, a head feeding mechanism 6 is provided on the mounting space 1. This head feeding mechanism 6 can be broadly classified into mounting pace 1.
It consists of a carriage guide mechanism 6A placed above and a carriage 6B that slides along this mechanism 6A.

The carriage guide mechanism 6A consists of a magnetic plate consisting of two pushers 81.8B placed above a wide groove 7 cut in the upper surface of the mounting space 1 so as to be vertically/slantably opposed, and a central leg 8C located between the two pushers 81.8B. A magnetic circuit 8 is provided in which the grooves 7 are arranged in parallel with a predetermined distance apart.
9B is installed on a pair of guide rods 9 on the inner surfaces of both sides. Note that the two presses 8A, 8 in the above magnetic circuit 8
Permanent magnets J Ok and J are placed on the opposing inner surfaces of B.
Each OB is fixed.

The carriage 6B has wheels 12 that roll on guide rods 9A and 9B at the bottom of a gutter-like frame 11 with an open upper end.
2B, 12C, 12D, etc., and the frame 1
1 is slidably fitted into the central leg 8C of the magnetic circuit 8 located inside the magnetic circuit 8. It has a coil 13. So what about this carriage 6B? When a current of a predetermined direction and level is passed through the coil 13, the electric current (m) with the magnetic circuit 8 causes the current to flow in the 1M and left and right directions in FIG.
b linearly move in the radial direction of the disk 4;

An optical head 14 and an actuator 15 provided integrally with the head 14 are fixed on the carriage 6B in a state that closes the open upper end of the gutter-like frame 11. The optical helad 14 includes a circuit that introduces a laser drive input according to recorded information, a circuit that sends retrieved reproduction information, etc. to the outside, and a circuit that performs tracking control and focusing control of the actuator 15. It is accommodated. Further, the actuator 15 is configured to irradiate the recording surface of the disk 4 with laser light to optically record recorded information and optically reproduce recorded information.

By the way, there are cable holders 1 on both sides of the mounting space 1.
Cable holders 18 and 19 are attached to the edge of the frame of 6.17 (carry tool) 6B. Of these cable holders, cable holders 16 and 18 support a power flexible cable 20.21, and cable holders 17 and 19 support a signal flexible cable 22.23. . Power cable 20
is, for example, a cable for supplying power to the head transport mechanism 6, and power cable 21 is, for example, a cable for supplying power to the light source of the optical head.

Further, the signal cable 22 is connected to the actuator 15, for example.
The signal cable 23 is a cable for transmitting a control signal for performing tracking control and focusing control of the actuator 15, for example.

These cables! 0, 21, and 22° 23 are all strip-shaped flexible parallel lines made of thin-walled conductors covered with highly flexible insulating material, and the central part of the line is parallel to the direction of head movement as shown in the first figure. It is installed bent in a U-shape.

In this device configured in this way, when the disk rotation drive motor 2 is rotated and the disk 4 is rotated at a constant speed, the hook/wiring cable 20.21
When driving, motive power, and control signals are supplied to the head feeder mechanism 6, optical helad 14, and actuator 15 via Recorded information is optically recorded or optically reproduced on the recording track of the disk 4 while moving.

At this time, the flexible cables 20 to 23 are deformed according to the movement of the carriage 6B, as shown by two-dot chain lines in FIGS. 1 and 2. In this case, since the flexible cables 20 to 23 have extremely small wall thicknesses and are highly flexible, the load on the head feeding mechanism 6 is small and the cables move and deform smoothly. Further, the influence of bending stress during the above deformation is small, and cable damage is unlikely to occur even with repeated operations. In addition, since the band-shaped flexible cable is curved in a U-shape along the head movement direction on both sides of the head feeding mechanism 6, the space occupied by the flexible cable is minimal, and the longitudinal direction of the device ( There is no need to increase the dimensions (in the left-right direction in FIG. 1 and in the left-right direction in FIG. 2).

In addition, since the flexible cables 20 to 23 are made of strip-shaped parallel conductors, they can be easily connected to a printed wiring board provided inside the head 14.

Furthermore, since the flexible cables 20 to 23 are arranged separately into the power cable 20.21 and the signal cables 22 and 23, there is no interference of noise from the power cable 20.21 to the signal cables 22 and 23, and the control This has the advantage of maintaining a good signal-to-noise ratio.

As explained above, according to the present invention, ? In a device in which the optical head is linearly reciprocated in the disk radial direction using a coil-driven head transport mechanism, power supply and signal transmission and reception to the optical head and head transport mechanism are performed at the installation pace. and head feed tJ
Since this is done using a band-shaped flexible cable that is installed between Q and M't with its central part curved in a U-shape along the direction of head movement, even if the cable deforms repeatedly over a long period of time, Even if the cable is moved, the possibility of damage to the cable is extremely low and it can withstand long-term use, and the flexible band cable is arranged in a U-shape next to the head feeding mechanism. ,
The above-mentioned cable occupies only a small space, requiring only a small amount of wiring space, and the load on the head feeding mechanism is small, so there is no risk of interfering with the head feeding operation. It is possible to provide a recording/reproducing device having various special advantages such as easy connection with a printed wiring board.

[Brief explanation of the drawing]

Figures 1 to 3 show the configuration of an embodiment of the present invention: 1... mounting plate, 2... disk rotation 1 drive sled, 3...
... Disc mounting table, 4... Disk, 5.
・・Disc holding plate, 6...Head feeder &, 6k・
... Carriage guide mechanism, 6B... Carriage, 7
... Groove, 8... Magnetic circuit, 9, 9B... Guide rod, 10, IOB... Permanent magnet, 11... Frame,
121.12B, 12C, 12D...wheels, 13...
・Voice coil, 14... Optical head, 15...
Actuator, 16.17... East side cable holder, 18.19... Carriage side cable holder,
20.21...Flexible power cable, 22.
23...Signal flexible cable.

Claims (2)

[Claims] (1) A disc-shaped recording medium, an optical head for optically recording and reproducing information on the recording medium, and a voice coil-driven head transport system for moving the optical head in the radial direction of the recording medium. a flexible strip provided between the head feeding mechanism and/or the head and the mounting space for supplying power and transmitting/receiving signals to the head feeding mechanism and the head that moves through the mechanism; 1. A recording and reproducing apparatus, comprising: a cable, wherein the band-shaped flexible cable is attached to a side of a head feeding mechanism with a central portion thereof curved in a U-shape along a head movement direction. (2) The flexible cable is characterized in that a power cable and a signal cable are arranged separately on both sides of the head feeding mechanism.
1) The recording/reproducing device described in item 1).