JPS6323278A - Optical disk device - Google Patents

Abstract

PURPOSE:To make high accuracy unnecessary, to enable the direction of a pickup always to be held in the radius direction of a disk, and to reduce the number of parts, by using the pickup arranged movably being guided by a guide member extending in the radius direction of an optical disk. CONSTITUTION:The pickup 14 is loaded on a guide bar 11 slidably, and a turning arm 16 is connected to the pickup 14. Thereby, it is possible to guide the pickup 14 between the outermost periphery and the innermost periphery of the disk 13, and also, to always set the direction of the pickup 14 in the radius direction of the disk 13. Therefore, it is possible to obtain an accurate tracking error signal at the time of track extraction. Furthermore, since it is enough for the turning arm 16 to have a length only to guide the pickup 14 between the innermost periphery and the outermost periphery of the disk 13, the length of the turning arm 16 can be made shorten, therefore, a pickup driving mechanism can be miniaturized as a whole.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to an optical disc device.

(Prior Art) Conventionally, this type of pickup device has an optical disk 2 rotated by a spindle motor 1, as shown in FIG.
A pickup 3 for reading information written on the disk is installed on a pair of opposing guides 4 that guide the disk 2 in the radial direction, and a magnet 5 and a drive coil 6 move the pickup 3 back and forth along the guide 4. It was moving.

In this case, very high precision is required for adjusting the guide 4 that guides the pickup 3 in the radial direction with respect to the disk 2. In addition, since the pickup 3 needs to move smoothly, there is a problem in that high accuracy is required for the parallelism of the one-phase guides 4 that face each other.

Further, as shown in FIG. 4, the pickup 3. There was something that guided the rotation.

In this case, since the pickup 3 moves in an arc shape and the direction of the pickup 3 does not match the radial direction of the disk 2, there is a problem that accurate tracking error signal extraction cannot be obtained by the three-beam method.

In addition, in the push-pull method, which is one of the tracking extraction methods, a tracking error signal can be obtained because the tolerance for differences in the disk radial direction and the orientation of the pickup is larger than in the three-beam method.
If the radius of rotation is small, accurate error signals cannot be obtained.

As a result, since the radius of rotation must be increased, there is a problem in that the pickup drive mechanism occupies a large area of the entire device.

(Objective of the Invention) The object of the present invention is to solve the above-mentioned problems, to be able to always maintain the direction of the pickup in the radial direction of the disk without requiring high precision, to reduce the number of parts, and to achieve miniaturization. An object of the present invention is to provide an optical disc device that can achieve the desired performance.

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a guide member that extends in the radial direction with respect to the optical disc and is rotatable about the rotation center line of the optical disc. , a pickup disposed so as to be movable while being guided by the guide member, and a pickup having a base end rotatably supported and a distal end rotatably connected to a connecting portion of the pickup. The gist of the invention is an optical disc device comprising a movable arm member.

(Function) With the above configuration, when the pickup moving arm rotates, the pickup is guided by the guide member and moves in an arc between the innermost and outermost peripheries of the disk. At this time,
Since the pickup only moves back and forth with respect to the guide member, the orientation of the pickup is always maintained in the radial direction of the disk.

(Example) An example embodying the present invention will be described below with reference to the drawings.

In FIG. 1, a guide shaft 11 as a guide member is an optical disk (hereinafter referred to as
A connecting portion 11a at the base end thereof is rotatably supported on the rotational center line of a disk 13 (simply referred to as a disk). Therefore, the guide rod 11 rotates around the rotation center line of the disk 13, and its rotation surface is parallel to the surface of the disk 13.

The pickup 14 is a device for recording information on the disk 13 or reproducing information, and the guide rod 11 is slidably inserted into the member 15 through a guide receiver formed on the lower surface of the pickup 14 without shaking. . Therefore, pickup 1
4 is reciprocated along the guide rod 11,
The pickup 14 is guided between the innermost and outermost peripheries of the disk 13.

The rotating arm 16 as a pickup moving arm member has its M end rotatably supported by a support member 17 so that its rotating surface is parallel to the rotating surface of the guide rod 11. The tip portion is rotatably connected to a connecting portion 18 formed on the side surface of the pickup 14. A near motor 19 serving as arm rotation means has a lower moving portion 19a drivingly connected to the rotation arm 16 to rotate the rotation arm 16.

Therefore, the rotating arm 16 and the pickup 14 are rotatably connected, and the pickup 14 is connected to the guide rod 11.
Since the pickup 14 is slidably attached to the rotary arm 16, when the rotary arm 16 is rotated by the linear motor 19, the pickup 14 performs a circular arc movement around the rotation center of the rotary arm 16. The pickup 14 always faces in the direction of the guide rod 11, that is, in the radial direction of the disk 13.

As described above, in this embodiment, the pickup 14 is slidably attached to the guide rod 1.
With a simple configuration of just connecting the rotary arm 16 to the rotary arm 16, the pickup 14 can be guided between the innermost and outermost circumferences of the disk 13, and the direction of the pickup 14 is always aligned with the radius of the disk 13. You can make it face in the same direction.

Therefore, an accurate tracking error signal can be obtained during tracking extraction.

Moreover, since the rotating arm 16 only needs to have a length sufficient to guide the pickup 14 between the innermost and outermost peripheries of the disk 13, the length of the rotating arm 16 can be shortened and the pickup can be driven. The overall structure can be made smaller.

In this embodiment, the substantially central position of the rotary arm 16 is rotated by the linear motor 19, but the output shaft of the motor is drivingly connected to the base end of the rotary arm 16 to perform the same rotation. The arm 16 may also be rotated. Further, by drivingly connecting a motor or the like to the guide rod 11 and actively rotating the guide rod 11, the pickup 14 is slid along the guide rod 11 so that the direction of the pickup 14 is always oriented in the radial direction of the disk 13. You can do it like this.

Further, the present invention is not limited to the above embodiments, and may be applied to, for example, video discs, compact discs, laser disc devices, etc.

(Effects of the Invention) As detailed above, according to the present invention, the direction of the pickup can always be kept in the radial direction of the disk without requiring high precision, and the number of parts can be reduced and the size can be reduced. can be achieved.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a pickup drive mechanism that embodies the present invention, FIG. 2 is an explanatory diagram for explaining the movement locus of the pickup, and FIG. FIG. 4 is an explanatory diagram for explaining the movement locus of the pickup in the same conventional pickup drive device of another type. In the figure, 11 is a guide rod, 13 is an optical recording disk, 1
4 is a pickup, 15 is a guide receiver, 16 is a rotating arm, and 19 is a linear motor. Patent applicant Brother Industries, Ltd. Representative Patent attorney On 1) Hironobu Figure 1

Claims (1)

[Claims] 1. A guide member (11) that extends in the radial direction with respect to the optical disc (13) and is rotatable about the rotation center line of the optical disc (13); A pickup (14) is arranged to be movable while being guided by a member (11), and a base end is rotatably supported and a distal end is connected to the pickup (14).
14); and a pickup moving arm member (16) rotatably connected to a connecting portion (18). 2. The optical disc device according to claim 1, wherein the guide member (11) is a guide rod, and the pickup (14) is slidably attached to the guide rod at two points. . 3. The optical system according to claim 1, wherein the pickup moving arm (16) is provided with an arm rotation means (19) for rotating the arm (16) about its base end. type disk device.