JPH0633536Y2 - Optical pickup position detection mechanism - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an optical pickup position detecting mechanism of an optical disk reproducing apparatus, and particularly for detecting lead-in areas of various kinds of disks such as CD, CDV, and LD. The present invention relates to a suitable optical pickup position detection mechanism.

[Prior Art] FIG. 3 shows a mechanism for detecting the lead-in positions of various discs in an optical disc reproducing apparatus for reproducing various types of discs such as conventional CDs, CDVs, and LDs.

The optical pickup 1 is guided by a guide rod 2 and a rail 3 and driven in the direction of the arrow shown in the figure.

A large number of microswitches 4, 4, ... Are arranged so that they operate when the optical pickup 1 comes to each lead-in position.

The lead-in position of each disk is detected by the operation of each micro switch 4.

[Problems to be Solved by the Invention] The above-mentioned conventional device has a drawback in that the position detection accuracy is deteriorated due to variations in the operating position of the microswitch.

In addition, since a large number of microswitches are arranged, there is a problem that space efficiency is poor and miniaturization cannot be achieved, and design restrictions are large.

Further, there is a problem that the cost becomes high because many micro switches are used.

Further, there is a problem that the cost becomes high because many micro switches are used.

The present invention was made in view of the above points,
It is an object of the invention to provide an optical pickup position detecting mechanism which has a low cost, a large degree of freedom in design, and a high position detecting accuracy.

[Means for Solving the Problems] The optical pickup position detecting mechanism of the present invention is an optical pickup position detecting mechanism of an optical disc reproducing apparatus for reproducing a plurality of types of discs each having a different size. A slit corresponding to a position, a photo interrupter for detecting the slit, a micro switch, and an actuator for operating the micro switch are provided, and one of the photo interrupter or the slit and one of the micro switch or the actuator are respectively picked up by an optical pickup. And the other of the photointerrupter or slit and the other of the microswitch or actuator not fixed to the optical pickup are fixed in the optical disk reproducing device housing, and the output of the microswitch is kept constant. The lead-in position of each of a plurality of types of disks is detected by counting the change in the output indicating the position of the slit detected by the photo interrupter.

[Operation] According to this invention, the lead-in positions of a plurality of types of disks can be detected by counting the edges of the slits with reference to the output change points of the microswitch. Further, since the detected lead-in position of the optical pickup is determined by the shape and size of the light flux of the slit and the photo interrupter, the detection accuracy can be easily increased.

Further, even if the lead-in position to be detected is increased, it is only necessary to increase the number of slits, and cost reduction and space saving are achieved.

[Embodiment] An optical pickup position detecting mechanism according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

In the figure, parts having the same functions as those shown in the conventional example are designated by the same reference numerals.

In FIG. 1, reference numeral 1 denotes an optical pickup, which is guided by a guide rod 2 and a rail 3 fixed to a frame and driven in the direction of the arrow shown.

A photo interrupter 5 is fixed to the optical pickup 1.

The slit 6 having the edges 6a, 6b and 6c and the microswitch 4 are also fixed to the frame.

When the optical pickup 1 is sent from the outer circumference to the inner circumference on the A surface of the disc in the above-mentioned configuration, the micro switch (SW) and the photo interrupter (PH) are moved with the movement of the position of the optical pickup shown in the arrow direction of the A surface in FIG. Output changes as shown.

The position where the microswitch output becomes H and the photointerrupter output becomes L first becomes the LD lead-in position.

Further, the optical pickup is sent in the inner peripheral direction and the slit notch portion is counted, whereby the CDV lead-in position and the CD lead-in position are detected.

When the optical pickup is sent to the B side, the optical pickup is inverted and guided by a guide rod and a rail different from the one shown in the drawing, and the microswitch 4 is not operated at this time. Then, the outputs of the microswitch (SW) and the photo interrupter (PH) change in the direction of the arrow on the B side shown in the figure, and the LD lead-in position on the B side can be detected.

[Effect of the Invention] According to the optical pickup position detecting mechanism of the optical disk reproducing apparatus of the present invention, the position of the optical pickup is detected by detecting the output change of the photo interrupter from H to L or from L to H. The accuracy is improved, and the detection positions can be easily increased by increasing the number of slits.

Furthermore, the number of microswitches used is small, resulting in cost reduction.

[Brief description of drawings]

1 is a perspective view showing an optical pickup position detecting mechanism of an optical disc reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a chart showing the operation of the same embodiment, and FIG. 3 is an optical pickup of a conventional optical disc reproducing apparatus. It is a perspective view showing a position detection mechanism. 1 ... Optical pickup, 2 ... Guide rod, 3 ... Rail,
4 ... Micro switch, 5 ... Interrupter, 6 ... Slit, 6a, 6b, 6c ... Edge.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Creator Tomomi Matsumura 2-17-5 Shibuya, Shibuya-ku, Tokyo Kenwood Co., Ltd. (72) Creator Masato Takahashi 2-17-5 Shibuya, Shibuya-ku, Tokyo Shareholders Company Kenwood (72) Inventor Makoto Horibe 2-17-5 Shibuya, Shibuya-ku, Tokyo Kenwood Co., Ltd. (72) Inventor Hiroyoshi Kobayashi 2-17-5 Shibuya, Shibuya-ku, Tokyo Kenwood, Inc. ( 72) Inventor Kazuaki Mano 2-17-5, Shibuya, Shibuya-ku, Tokyo Kenwood Co., Ltd. (56) References Showa 59-25666 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. An optical pickup position detecting mechanism of an optical disk reproducing apparatus for reproducing a plurality of types of discs each having a different size, and a slit corresponding to a lead-in position of the plurality of types of discs, and a photo interrupter for detecting the slits. And a microswitch and an actuator for operating the microswitch, wherein one of the photointerrupter or the slit and one of the microswitch and the actuator are fixed to the optical pickup, respectively, and the photointerrupter or the slit not fixed to the optical pickup. Of the slits detected by the photo interrupter in a state where the output of the micro switch is fixed, while fixing the other of the micro switch and the other of the micro switch or the actuator in the housing of the optical disk reproducing device. Optical pickup position detecting mechanism characterized by being configured to detect each of the lead-in position of the plurality of types of disks by counting the change in the output indicating the location.