JPH0235630A - Optical head driver - Google Patents

Abstract

PURPOSE:To form an optical head, a spindle, and a driving part in simple constitution and in compact shape and to obtain a satisfactory characteristic by arranging the optical head and a voice coil motor at a position where they are confronted with each other by interposing the spindle, and connecting then with a force transmitting arm. CONSTITUTION:On a base 3, the spindle 4 to drive a disk shape recording medium 5, the optical head 1, and the voice coil motor 9 to drive the optical head 1 are provided. And the optical head 1 and the voice coil motor 9 are arranged at the position where they are confronted with each other by interposing the spindle 4, and they are connected by the force transmitting arm 6. Therefore, it is possible to conform the operating point and the operating direction of a driving force to the center of gravity and the variable moving direction of the optical head 1, and furthermore, to transmit the driving force via the force transmitting arm 6 which forms post structure, and also, the suppress unrequired mechanical resonance since the voice coil motor 9 is arranged in the neighborhood of the spindle 4. In such a way, the driving device with high performance suitable for fast access can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical head driving device, and particularly to an optical head driving device that records information on the surface of a disk-shaped recording medium using optical means, or records information that has already been recorded. The present invention relates to an optical head driving device in which an optical head is driven by a voice coil motor in an optical disk device for reproducing or erasing data.

[Prior Art] In general, in an optical disk device, a disk-shaped recording medium is rotated by a spindle, and information is sequentially recorded by an optical head onto approximately concentric recording tracks of the recording medium-L according to the rotation of the spindle. Similarly, the recorded information is reproduced and erased sequentially by an optical head as the disc-shaped recording medium rotates.The optical head is moved in the radial direction of the recording medium by a drive unit.
With the above configuration, information can be recorded, reproduced, and erased over the entire surface of the disk-shaped recording medium.

Additionally, voice coil motors are used in drive units for systems that require high-speed data access, enabling much faster access than optical disc drives that use step motors or the like for drive units. .

Conventionally, in an optical head drive device for an optical disk device that uses this type of voice coil motor as a drive section, the drive section is generally arranged on the side of the optical head in the direction of movement of the optical head, or the drive section is placed on the spindle of the optical head. It was placed in the opposite position.

[Problems to be Solved by the Invention] However, in an optical head drive device in which the drive unit is arranged only on one side of the optical head, the direction of the drive force must be in the direction of movement of the optical head, so the drive force is The point of action does not coincide with the center of gravity of the optical head, which is a movable surface, resulting in unnecessary vibrations during driving.

On the other hand, if drive units are placed on both sides of the optical head, the drive force can be balanced, but the drive force is still transmitted to the optical head through a type of stiff structure that is perpendicular to the direction of action. Therefore, it is extremely difficult to obtain sufficient high-frequency drive characteristics, and the structure is also complicated, resulting in poor productivity and increased recycling costs.

On the other hand, if the drive part is placed on the side of the optical head opposite to the spindle, the structure will be simple and the force will be transmitted well, but the drive part will be larger than the outer shape of the disk in the direction of movement of the optical head. Since the device has a protruding and elongated shape, there is a drawback that the overall structure of the device becomes large.

Furthermore, in this structure, the spindle, the guide for moving the optical head, and the drive unit are arranged vertically in series, and the spindle and the drive unit are located at the farthest position, and the rigidity of the base that connects them is reduced to 1 in order to suppress unnecessary vibrations. However, in a small device A, a sufficiently rigid base cannot be used due to space limitations, and there is also the drawback that the spindle vibrates relative to the optical head.

SUMMARY OF THE INVENTION An object of the present invention is to provide an optical head drive device that solves the above-mentioned drawbacks, has an optical head, a spindle, and a drive unit that have a simple structure and a compact shape, and that provides better characteristics.

[Means for Solving 5 Problems J The present invention has been made to solve the above problems, and as a means of solving the problem, the present invention includes a spindle for driving a disk-shaped recording medium on a base, In an optical head driving device including an optical head and a voice coil motor for driving the optical head, the optical head and the voice coil motor are arranged at corresponding positions across the spindle and connected by a force transmission arm. It is configured to do this.

[Example] Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a side view showing an optical head driving device according to an embodiment of the present invention.

In the figure, 1 is the optical head, 2 is the guide rail, 3 is the base,
4 is a spindle, 5 is a disk-shaped recording medium, 6 is a force transmission arm, 7 is a magnetic circuit, 8 is a coil, and 9 is a voice coil motor.

The optical helad l is movably supported from the base 3 via the guide rail 2 in the tracking direction shown by the arrow X in the figure.
moving along a recording medium 5 mounted on a spindle 4;
Information is recorded, reproduced, or erased on the recording medium 5.

Further, the optical helad 1 is connected by a force transmission arm 6 to a coil 8 inserted into a gap in a magnetic circuit 7 connected to the base 3 on the opposite side of the spindle 4 from the optical helad 1. It is driven by the force generated by a voice coil motor 9 composed of a magnetic circuit 7 and a coil 8.

The spindle 4 is fixed to the base 3 or the magnetic circuit 7. Further, the disk 5 is sometimes used while being housed in a cartridge 10.

As a result, the driving force of the voice coil motor 9 is generated by accurately aligning the center of gravity of the optical radar 1 with its movable direction, which is the tracking direction, and with regard to driving force transmission, a force that forms a columnar structure that coincides with the direction of action. The transmission arm 6 transmits the optical signal to the RAD 1 . Furthermore, only one coil 8 and one magnetic circuit 7 are required, and since the coil 8 is inserted into the magnetic circuit 7 from one direction, assembly is easy.

Furthermore, although the optical disc l moves in a certain area smaller than the radius of the disk 5 as shown by Y in the figure, the coil 8
Since only the same movement area is required, for example, by setting an area as shown by Z in the figure, the voice coil motor 9 can be configured approximately within the outer diameter of the recording medium 5 or its cartridge IO. , the optical disk l, the spindle 4, and the voice coil motor 9 can all be configured within an area approximately equal to the outer diameter of the disk 5 or its cartridge 10. In addition, since the distance between the voice coil motor 9, which is the driving force generating part, and the spindle 4 is short, the same effect as the equivalent increase in the rigidity of the base 3 can be obtained, and the relative stiffness of the spindle 4 to the optical disk 1 can be obtained. It is possible to suppress physical vibration.

[Effects of the Invention] As explained above, in the optical head driving device of the present invention, the optical head and the voice coil motor that drives the optical head are arranged opposite to each other with the spindle in between, and a force transmission arm is formed. By connecting the drive force with the optical head, the operating point and direction of the driving force can be made to coincide with the center of gravity of the optical head and the direction of its movement, and this driving force can be transmitted via the force transmission arm having a columnar structure. Since the voice coil motor and spindle are placed close to each other, unnecessary mechanical resonance can be suppressed, and as a result, a high-performance optical head drive device suitable for high-speed access can be realized.

In addition, it is easy to assemble, and furthermore, it is possible to realize an optical head drive S device in which the main equipment parts are compactly housed in an area approximately equal to the outer diameter of the recording medium or its cartridge. be.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an optical head driving device according to an embodiment of the present invention. l: Optical head 3: Base 4 Spindle 5: Recording medium 6: Force transmission arm 9: Voice coil motor Fig. 1 1゜

Claims (1)

[Claims] An optical head driving device includes, on a base, a spindle for driving a disk-shaped recording medium, an optical head, and a voice coil motor for driving the optical head. An optical head driving device characterized in that the optical head driving device is arranged in a corresponding position between the two sides and connected by a force transmission arm.