JPS6153772B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical pickup that drives an optical pickup made of a semiconductor laser or the like of an optical video disk player or an optical sound reproducing player in a focusing direction and a tracking direction and supports it so that it can vibrate. The present invention relates to a signal reading device for a disc player.

Conventionally, in an optical video disc player, in order to detect information from pits formed on the surface of the video disc, for example, when the pick-up is formed by a semiconductor laser pick-up, a rotating pit is used. It was necessary to adjust the beam spot to be focused on each pit of the video disc, and it was also necessary to irradiate the beam spot to each pit without shifting, and to detect a signal from the reflected light. This includes:
It was necessary to support the pickup so that it could vibrate in the focusing direction, ie, the vertical direction, and in the tracking direction, ie, the horizontal direction, relative to the video disk.

As this supporting method, there is a conventional method shown in FIG. 1, for example. That is, the pick-up A was suspended using a corrugation-shaped damper material B. However, in this method, when the pick-up A is vibrated in the tracking direction, the damper material B
Because it has compliance in the focuser direction, it does not vibrate smoothly and is not only a problem.
It also had a negative effect on vibrations in the focus direction. Moreover, the strange resonance of the damper material B itself has an adverse effect on the vibration of the pickup A. Also, due to the direction of the driving point with respect to the pickup A and the relationship between the driving point and the fulcrum, the pickup A does not vibrate smoothly in the tracking direction.
Pickup A sometimes vibrated linearly in the direction of the driving force. Moreover, the movement of the support point relative to the pick-up A was unreasonable, causing a twisting phenomenon. Therefore, the signal reading accuracy has been reduced. Moreover, if the entire pickup is designed to be small and a good mounting position cannot be selected due to the interaction with the video disk or other devices, the above
Abnormal linear vibrations fall within the required frequency band, making it impractical.

Furthermore, when the damper material B vibrates in the focusing direction or the tracking direction, the neutral point changes greatly over time, and there is also a problem in the reliability of the strength of the damper material B itself.

The present invention has been made in view of the above-mentioned points, and one of its objects is to provide a semiconductor laser pickup, which is an optical pickup, for example, in a substantially double cylindrical shape with an inner cylinder part and an outer cylinder part. By using a structured support member and supporting it within the pole yoke of the magnetic circuit of the focus direction drive unit,
An object of the present invention is to provide a signal reading device for an optical disk player that can freely vibrate a semiconductor laser pickup in the focusing direction and the tracking direction without distortion.

Hereinafter, the present invention will be explained according to an embodiment shown in FIGS. 2 and 3. 1 is a semiconductor laser pickup; 2 is a support member for supporting the semiconductor laser pickup 1; this support member 2 is made of an inner cylindrical portion 2A made of an elastic material such as rubber and a metal such as aluminum; It is formed into a substantially double cylindrical structure in which the outer cylindrical portion 2B is connected by a connecting piece 2C extending in the radial direction. Then, the semiconductor laser pickup 1, which is fitted and fixed into the inner cylinder part 2A of the support member 2, is moved to the focus direction dedicated drive part 3.
It is fitted into the guide hole 6a of the pole yoke 6 and supported. The focuser direction dedicated drive section 3 is for driving and vibrating the semiconductor laser pickup 1 in the focus direction, that is, in the vertical direction. It is formed by inserting an electromagnetic coil 8 into 7A. Electromagnetic coil 8
is wound around the outer periphery of a bobbin 9 fixed to the semiconductor laser pickup 1. Reference numerals 10 and 11 denote tracking direction dedicated drive units for driving and vibrating the semiconductor laser pickup 1 in the tracking direction, that is, in the left and right directions. A magnetic gap of a magnetic circuit 15 in which electromagnetic coils 13, 13 wound around bobbins 12, 12 fixed to the top and bottom of the semiconductor laser pickup 1 are provided above and below the focus direction dedicated drive unit 3 via insulating materials 14, 14. 16. The magnetic circuit 15, which is shown rotated by 90 degrees for convenience of illustration, is inserted into the opening of the bobbins 12, 12, and serves as a pair of upper and lower poles 1 to set the vibration limit in the focus direction of the semiconductor laser pickup 1.
7, magnet 18, yoke 19, plate 20
is formed. 21 is a disk.

Since one embodiment of the present invention has the above-described configuration, when the electromagnetic coil 8 of the focus direction dedicated drive unit 3 is energized, the electromagnetic circuit 7
The electromagnetic coil 8 inserted into the magnetic gap 7A is subjected to a force in the vertical direction as shown in FIG. When the outer cylindrical portion 2B of the member 2 slides within the guide hole 6a of the pole yoke 6, it vibrates in the focus direction, and the focusing of the beam spot irradiating the disk 21 can be adjusted. Further, the electromagnetic coils 13 of the tracking direction dedicated drive units 10, 11,
13, this electromagnetic coil 13,1
3 receives the magnetic flux of the magnetic circuit 15 and is subjected to a force in a direction perpendicular to the magnetic flux, so that the semiconductor laser pickup 1 swings in the left-right direction about the connecting piece 2C made of an elastic material of the support member 2 as a fulcrum. Vibrate. Moreover, since a couple is generated in the semiconductor laser pickup 1 using the support member 2 as a fulcrum, the semiconductor laser pickup 1 supported by the support member 2 is driven in the tracking direction.
It vibrates smoothly without any strange resonance with the support member 2, and the signal from the pit of the disk 21 can be read accurately. In addition, if the installation distance between the poles 17, 17 and the bobbins 122, 12 is set in accordance with the vibration limit for focusing, the tracking direction dedicated drive units 10, 11 can be set in a normal manner in the focusing direction of the semiconductor laser pickup. Semiconductor laser pick-up 1 without disturbing vibration and regulating vibration limit in focus direction
collision with the disk 21 can be prevented.

As described above, the present invention uses an elastic material to support a semiconductor laser pick-up as an optical pick-up in a guide hole provided in a focus-direction drive unit in a radial direction. The pick-up 6 is supported by a support member that is connected to each other by a connecting piece that is formed to extend, and a pair of dedicated tracking-direction drive units are arranged equidistantly above and below the pickup 6, with the support member at an intermediate position. The installation distance between the pole yoke, which constitutes the drive means, and the bobbin is set in accordance with the vibration limit for focusing, so even if the pick-up is supported by one support member, it can be moved in the focusing direction without colliding with the disk. In addition, the generated couple can cause the pickup to vibrate smoothly in the tracking direction without twisting or linear movement, and it is also possible to prevent the occurrence of odd vibrations with the support member. .

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a conventional method of supporting a signal reading device for a video disc player, FIG. 2 is a perspective view showing an embodiment of the present invention, and FIG. 3 is a support member that also constitutes the present invention. It is a perspective view showing an example. DESCRIPTION OF SYMBOLS 1...Semiconductor laser pickup, 2...Supporting member, 2A...Inner cylinder part, 2B...Outer cylinder part, 2C...
... Connecting piece, 3 ... Focus direction dedicated drive section, 6
a... Guide hole, 10, 11... Tracking direction dedicated drive unit.

Claims (1)

[Claims] 1. An optical pick-up for reproducing information on a disk, a focus-direction dedicated drive section for driving the pick-up in a focus direction perpendicular to the information recording surface on the disk, and a focus-direction dedicated drive section for driving the pick-up in a focus direction perpendicular to the information recording surface on the disk. a support member supported in the guide hole of the pick-up and connected to the inner cylinder part and the outer cylinder part by connecting pieces made of an elastic material extending in the radial direction; a tracking direction dedicated drive section, the tracking direction dedicated drive section includes a bobbin that is fixed at an equal distance above and below the pick-up with the support member positioned in between, an electromagnetic coil wound around the bobbin, and the above-mentioned It is formed of a pair of upper and lower poles inserted and arranged in the openings of a pair of bobbins, and a magnetic flux generating means that cooperates with the poles to generate a magnetic flux that crosses the winding of the electromagnetic coil,
A signal reading device for an optical disk player, characterized in that when the pickup is driven in a focus direction, the bobbin comes into contact with the pole to set a limit of movement of the pickup.