JPS59215081A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent in advance generation of fault due to overrun or the like by regulating a head moving range by a photo sensor and regulating a head moving limit by a limit switch to move stably an optical head within a prescribed range on a disc. CONSTITUTION:A shutter 22 and a couple of pressing pieces 23A, 23B are fited to a side wall of a holding frame 10. A couple of photo sensors 24A, 24B and limit switches 25A, 25B are provided to a prescribed position of a mounting base 1 respectively corresponding to the shutter or the like. The recording/ reproducing operation is started at the innermost circumferential position of a disc 4 for an actuator 11 of an optical head 10 and ends at the outermost recording position of the disc 4. Thus the information recording region on the disc 4 is made constant and stable recording/reproduction is attained. Further, if the photo sensors 24A, 24B are defective, when the actuator 11 of the head 10 reaches the inner limit position on the disc 4, the limit switch 25A is activated and when the actuator 11 reaches the outer limit position, the limit switch 25B is activated to stop the head carrying. Thus, the device is kept safe.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a device 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 in particular to an apparatus for optically recording and reproducing information such as an image on a disk-shaped recording medium (hereinafter referred to as a disk). This invention relates to head movement range regulating means.

[Technical background of the invention and its problems] Conventional devices of this type generally move the head in the radial direction of the disk using a head feeding mechanism to form concentric or spiral recording tracks on the disk to record or record information. It is configured to perform playback. In a device with such a configuration, it is necessary to move the head within a predetermined range on the disk, but conventional devices do not have a means for accurately regulating the range of movement of the head. There wasn't. As a result, the recording areas of the tracks formed on the disk become uneven, making it impossible to perform a smooth reproduction operation, and there is a risk of failure due to overrun of the optical head.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a recording/reproducing apparatus that can stably move an optical head within a predetermined range on a disk and can prevent failures due to optical head overrun or the like.

[Summary of the invention]

In order to achieve the above object, the present invention is characterized by the following configuration. That is, in a device in which an optical head for optically recording and reproducing information on a disk is moved in the radial direction of the disk by a head feeding mechanism, a signal is sent to stop the operation of the feeding mechanism. and a photo sensor that sends a signal to stop the operation of the head feeding mechanism when the head reaches an inner limit position beyond the innermost recording position and an outer limit position beyond the outermost recording position. By providing a limit switch, the normal head movement range is regulated by the photo sensor, and the head movement limit in the event of an abnormal operation is regulated by the limit switch.

[Embodiment of the Invention] FIGS. 1 and 2 are a top view and a side view showing the configuration of one embodiment of the present invention. In Figures 1 and 2, 1
is a large mounting space made of metal such as aluminum, and the disk rotation drive motor 2 is vertically installed on this mounting space. Disk mounting table 3 attached to the rotating shaft of this motor 2
A disk 4 is placed on the upper surface of the disk 4, and is fixed by a disk-shaped disk holding plate 5.

On the other hand, a head guide mechanism 6 is provided on the mounting space 1. This head guide mechanism 6 includes a guide rail 7A laid parallel to the mounting space 1.

It consists of a holding frame 9 that moves in the left-right direction (in the disk radial direction) in the figure by means of 7B, 8A, and 8B. An optical head 10 and its actuator 11 are integrally fixed to the upper part of this holding frame 9. The optical head 10 houses a circuit that introduces a laser drive input according to recorded information, a circuit that sends retrieved reproduction information, etc. to the outside, and the like. Further, the actuator 11 is configured to irradiate the recording surface of the disk 4 with laser light to optically record recorded information and optically reproduce recorded information.

Power is supplied to the head 10 and actuator 11, and signals are sent and received between a cable holder 12 attached to the attachment plate 1 and a cable holder 13 attached to one side wall of the holding frame 9. On the side of the mechanism 6, a male screw type drive mechanism 15, which together with the mechanism 6 constitutes a head feeding mechanism, is installed parallel to the guide mechanism 6. This Sol screw type drive mechanism 15 is rotatably supported by a bearing 16.77. - Drive motor 19 consisting of a stepping motor etc.
By driving 5 one revolution, one end? - the other end is connected to the retaining frame 10
against one side wall), ? O.A.

The five-shaped connecting body 21 fixed by 20B or the like is configured to be moved in parallel to the moving direction of the head 10.

By the way, as shown in FIG. 1, a shutter 22 and a pair of suppressors 231 and 23B are attached to the other side wall of the holding frame 10. Correspondingly, the mounting space 1 also includes a pair of photosensors 24, 24B, and a limit switch 25A.

25B are respectively installed at predetermined positions.

When the holding frame 10 moves to a certain position in this way, the shutter 22 is activated by the photo sensor, ? 4A or 24B, and the rotation of the drive motor 190 is stopped.

The photosensor 24 is installed at a position corresponding to the recording origin position of the disc 4, that is, the innermost recording position, and the photosensor 24B is installed at a position corresponding to the outermost recording position of the disc 4. In addition, if the photo sensor 24 loses the stop function by 24B,
Alternatively, when an overrun occurs in the holding frame 10, when the holding frame 10 moves to one inner limit position, the limit switch 25A is turned on in the suppressor 23k, and when the holding frame 10 moves to the other outer limit position, the limit switch 25A is turned on in the suppressor 23k. , the suppressor 23BK and the limit switch 25B are turned on, and the rotation of the drive motor 19 is stopped in either case.

In this device configured in this way, the disk rotation drive motor is rotated to rotate the disk 4 at a constant speed,
When drive power and control signals are supplied to the optical head 10 and the actuator 1 via the flexible cable 14 while the drive motor 19 is rotated and the ball screw 18 is rotationally driven, the optical head 10 and the actuator 11 are optically records and optically reproduces recorded information on the recording track of the disk 4 while moving in the disk radial direction in accordance with the movement of the holding frame 9.

The recording and reproducing operations at this time are performed at the position where the shutter 22 is detected by the photosensor 24, that is, the optical head 1.
0 is at the innermost recording position of the disc 4, and the shutter 22 is at the position detected by the photosensor 24B, that is, the actuator 11 of the optical disc 10 is at the outermost recording position of the disc 4. The process ends when the state is reached.

Therefore, the information recording area on the disk 4 is made constant, and stable recording and reproduction can be performed.

In addition, in the case where 24B of the above-mentioned sensor 24 malfunctions, when the actuator 1 of the head 10 reaches the inner limit position on the disk 4, the limit switch ? 5A is activated, and when the outer limit position is reached, the limit switch 25B is activated, and the head feeding operation is stopped at that position. Therefore it is safe.

〔Effect of the invention〕

According to the present invention, when the optical head reaches the innermost recording position and the outermost recording position on the disk, the head feeding mechanism stops operating in response to a signal from the photosensor, and the head returns to the innermost recording position. When reaching the inner limit position that has exceeded the limit position and the outer limit position that has exceeded the outermost recording position, the head feeding mechanism will stop operating due to a signal from the limit switch, so the normal operating range is regulated by the photo sensor. recording and reproducing can be performed stably in a predetermined area on the disc.

Further, in the event that the optical head malfunctions, the limit switch restricts its operating limit, making it safe. As described above, according to the present invention, it is possible to provide a recording and reproducing apparatus that can stably move an optical head within a predetermined range on a disk, and can also prevent failures due to optical head overrun or the like.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are a top view and a side view showing the configuration of an embodiment of the present invention. -71...Installation pace, 2
... Disk rotation drive motor, 4... Disk,
6... Head guide mechanism, =9- 7A, 7B and 8, 8B... Guide rail, 9.
...Holding frame, 10...Optical head, 11...Actuator, 15...? - screw type drive mechanism, 22.
...Shutter, 231.23B...Press element, 24A,
24B...Photo sensor, 251.25B...Limit switch. Applicant's agent Patent attorney Takehiko Suzue 10-

Claims (1)

[Claims] A disc-shaped recording medium, an optical head for optically recording and reproducing information on the recording medium, and a head feeding mechanism for moving the optical head in a radial direction of the recording medium;
A photo sensor that sends a signal to stop the operation of the head feeding mechanism when the head reaches the innermost recording position and the outermost recording position on the disk by the head feeding mechanism; a limit switch that sends a signal to stop the operation of the head feeding mechanism when the head reaches an inner limit position beyond the innermost recording position on the disk and an outer limit position beyond the outermost recording position on the disk; A recording/reproducing device characterized by comprising: