JPS6222248A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain the low cost for the titled device by sharing a laser beam source, a signal detection section and a system control section in common to the plural sets of optical discs, optical heads and carrying bases. CONSTITUTION:The optical disc 1 is driven by a rotary shaft 2 and a rotary driver 3 to the required number of revolutions, a laser beam is irradiated to the disc 1 through the optical head 4 to record and reproduce the information. The laser beam is irradiated from the laser beam source and a signal detection section 20 to the optical head 4, reaches the signal recording face of the disc 1 via a reflecting mirror 7, the carrying base 5 and the optical head 4 through an optical path (a), the reflected light from the face goes reversely and returns to the signal detection section 20, to obtain various control signals and information signals. The information is recorded and reproduced to the disc 11 similarly. The entire system is controlled by a system control section 21 and reflection mirror drivers 8, 18 apply position control to reflection mirrors 7, 17 to attain recording and reproduction of free information to the discs 1, 11.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an information recording/reproducing apparatus using an optical disc.

2. Description of the Related Art In recent years, optical disk memories have attracted attention as large-capacity information recording media. An optical disk memory records and reproduces information by focusing laser light into a minute spot of about 1 micron and irradiating it onto a disc-shaped recording medium. Therefore, the recording density is much higher than that of a magnetic disk, random access to specific recorded information is possible, and the cost per bit is lower than other types of memory. Taking advantage of these features, image file systems and computer data files using optical disks are being actively developed.

Although the amount of information that can be recorded on one optical disk is much larger than that on a magnetic disk of the same diameter, there is a certain limit to the amount of information. For this reason, in a large-scale image file system or data file system, a single disk does not have enough information recording capacity, and it becomes necessary to perform random access across multiple disks.

A conventional example for achieving the above object is shown in FIG. Third
In the figure, 31 is an information recording and reproducing device, 32 is an information recording and reproducing device different from 31, d is an output signal line of the information recording and reproducing device 31, e is an output signal line of the information recording and reproducing device 32, 3
3 is an output selection device for selecting one of the output signal lines d and e, and f is an output signal line of the output selection device 33. In this example, multiple information recording and reproducing devices are always operated in parallel,
When information is required, the output selection device 33 is controlled so that the output of the information recording/reproducing device in which the disc on which the information is recorded is mounted is output to the signal line f, and the output selection device 33 is This is a method to realize random access to. In this method, if information recording and reproducing devices other than the number of sheets to be randomly accessed are prepared, information can be retrieved at a relatively high speed.

Another row of conventional rows is shown in FIG. In Figure 3, 41
4 is an information recording/reproducing disk, 42 is a rotary table, and 43 is an information recording/reproducing device. This example is a disc changer, and a plurality of discs are placed on a rotary table 42. A disk on which necessary information is recorded is selected by rotation of the turntable 42 and loaded into the information recording/reproducing device 43, after which the necessary information is extracted. After extracting the information, the disc is returned to the rotating table 42 from the information recording/reproducing device 43 in the reverse order. Although this method can manage a large number of discs, it requires time to transfer the disc between the rotating table 42 and the information recording/reproducing device 43 each time one disc is selected.

Problems to be Solved by the Invention As described above, when extracting necessary information from a large number of optical discs, the method of operating a large number of information recording and reproducing devices in parallel increases the cost due to the large number of information recording and reproducing devices. There was a problem. The method using a disc changer has the problem that it takes a relatively long time for the disc changer to select a target disc, load it into the information recording/reproducing device, and reach a certain number of rotations of the disc. Ta. Disc changers also had problems in terms of cost and reliability.

Means for Solving the Problems In order to solve the above-mentioned drawbacks, the present invention uses one laser light source for multiple sets of optical disks, optical heads, and transfer tables, and uses the laser light emitted by the laser light source. It is composed of an optical system and an optical system control device that can be selectively supplied to a certain optical head. Therefore, the laser light source, signal detection section, and system control section are shared by multiple sets of optical disks, optical heads, and transfer tables.

According to the above-described structure, the laser light emitted from the laser light source passes through an optical system controlled by an optical system control device to extract current information from a large number of optical heads. It is sent to an optical head that corresponds to the desired optical disc. When information on another optical disc is required, the optical system can be re-controlled to send laser light to the optical head corresponding to the target disc.

Embodiment FIG. 1 is an embodiment of the present invention. In Figure 1, 1
2 is an optical information recording disk, 2 is a disk support rod, 3 is a disk rotation drive device, 4 is an optical head, 5 is an optical head transfer table, 6
1 is a transfer table guide rail, 7 is a laser beam reflecting mirror, 8 is a reflecting mirror driving device,
8 corresponds to one set. Further, 11 is an optical information recording disk, 12 is a disk support rod, 13 is a disk rotation drive device, 14
15 is an optical head, 15 is an optical head transfer table, 16 is a transfer table guide rail, 17 is a laser beam reflecting mirror, 18 is a reflecting mirror driving device, and 12 to 11 are provided for another information recording disk 11. 18 corresponds.

2o is a laser light source and a signal detection section, and 21 is a system control section which has overall control.

Further, a is the optical path of the laser beam when performing recording/reproducing on the disk 1, and ``a'' is the optical path of the laser beam when performing the recording/reproducing on the disk 2.

The operation of this implementation will be explained below. The optical disc 1 is rotationally driven to a required number of rotations by the rotation 1l-1t12 and the rotational drive device 3. A laser beam is irradiated onto the disk 1 through an optical head 4 to record and reproduce information. The optical head 4 is moved by moving the transfer table 6 along the transfer table guide rail 6. In addition, the laser beam incident path to the optical head 4 is such that the laser beam is first emitted from the laser light source and the signal detection section 20, then reflected by the reflecting mirror 7 along the optical path a, and then passes through the transfer table 6 and the optical head 4. Siddisk 1
reaches the signal recording surface. The laser beam reflected on the disk signal recording surface passes through the optical path a in the reverse order to the above and returns to the laser light source and signal detection section 20 to obtain various control signals and information signals. Next, assume that information is to be recorded and reproduced on the disc 11. Like the disk 1, the disk 11 is also supported by a rotating shaft 12 and is constantly rotationally driven by a rotational drive device 13.

Prior to recording and reproducing information on the disk 11, the reflecting mirror 17 enters the optical path a that led from the laser light source and the signal detecting section 20 to the reflecting mirror 7, and passes the laser light emitted by the laser light source and the signal detecting section 20. is reflected by the reflecting mirror 17 to form an optical path, which passes through the transfer table 15 and the optical head 14 and reaches the signal recording surface of the disk 11.
is position controlled. The position of the reflecting mirror 17 is controlled by a reflecting mirror driving device 18. The laser light reflected from the signal recording surface of the disk 11 is returned to the laser light source and signal detection section 2o in the reverse order to the above, and various control signals and information signals are obtained. The system control unit 21 controls the entire system. As described above, by controlling the position of the reflecting mirror 17 by the reflecting mirror driving device 18, the disk 1 and the disk 11 can be moved.
It becomes possible to freely record and reproduce information.

In this example, two disks were used, but one rotating shaft
21 rotation drive device 13. Optical head 14° Optical head transfer table 15. It is possible to increase the number of disks by adding the transfer table guide rail 16° reflecting mirror 179 and the reflecting mirror driving device 18. In this case as well, the laser light may be sent to the target disk by controlling the position of the reflecting mirror.

Note that the method of driving the reflecting mirror does not matter.

Effects of the Invention As described above, according to the present invention, when it is necessary to extract target information from a plurality of optical discs, it is possible to extract the desired information from a plurality of optical discs. ,
In the present invention, devices other than the disk motor, optical head, and transfer table can be shared by a plurality of disks, so the cost can be reduced.

Furthermore, in the present invention, since all the optical disks are already installed in the information recording/reproducing device, the optical disk on which information is to be recorded or reproduced is switched only by changing the angle or position of the reflector. Optical disc selection time is much faster when using a disc changer.

Further, in the present invention, since the laser light source and the signal detection section are fixed and only the optical head portion is movable, the mass of the movable portion is small and the optical head can be accessed at high speed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an information recording/reproducing device according to an embodiment of the present invention, FIG. 2 is a perspective view of a conventional multiple disk access device, and FIG. 3 is a perspective view of another conventional multiple disk access device. It is a diagram. DESCRIPTION OF SYMBOLS 1... Optical information recording disc, 3... Disc rotation drive device, 4... Optical head, 6...
...Optical head transfer table, 7...Laser beam reflecting mirror, 8...Reflector driving device, 11...
・Optical information recording disk, 13... Disk rotation drive device, 14... Optical head, 15...
Optical head transfer table, 17...Laser beam reflecting mirror, 18...Reflector driving device, 2o...
Laser light source and signal detection unit, 21...control unit and signal processing unit, a...laser beam path (during disk 1 recording and reproduction), b...laser beam path (When recording and reproducing the disc 11). Name of agent: Patent attorney Toshio Nakao and 1 other person 4.
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Claims (1)

[Claims] A plurality of information recording/reproducing disks for recording and reproducing information using laser beams, a disk drive device for rotationally driving the plurality of disks, and a disk driving device for driving the plurality of disks with laser beams. a plurality of optical heads for irradiation; a laser light source provided separately from the plurality of optical heads; an optical system that selectively supplies the laser light emitted from the laser light source to the optical head; an optical system control device that selectively supplies laser light to the optical head using an optical system; a signal detection device that detects an information signal from the reflected laser light; and a signal detection device that detects an information signal from the reflected laser light; An information recording and reproducing apparatus comprising: a plurality of optical head transfer devices that drive in the radial direction of a disk; and a system control section that provides control commands to the optical system control device and the optical head transfer device.