JPH0370858B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to an optical information recording/reproducing apparatus, and more particularly to an optical information recording/reproducing apparatus having means for discriminating between a plurality of types of recording media. The present invention is applied to optical information recording and reproducing devices used in home recording and reproducing devices, document filing devices, and the like. [Prior art] As an optical information recording/reproducing device, there is a method of recording, erasing, and reproducing information by applying a laser beam to a recording medium (hereinafter referred to as a disk). There are discs such as discs that can be recorded only once (DRAW type), and erasable discs that can be recorded and played back multiple times (E-DRAW type). A ROM type disk has small holes formed in advance in accordance with the information, and the information signal is reproduced by changing the amount of transmitted or reflected laser light. DRAW type disks create unevenness according to the information to be recorded by shining a laser beam onto the disk surface, and reproduce information signals by changing the amount of transmitted or reflected light. E-DRAW type disks perform recording and erasing by causing magnetization reversal with a laser beam, and play back by magnetic force or the like. These disks are selected depending on the purpose of the information to be recorded. ROM type disks are used when the information is predetermined and must be mass-produced and stored for a long period of time, and DRAW type disks are used when the required quantity is small and must be stored for a long period of time. There is a possibility that the information will be erased later, so E-DRAW type disks are used when used as temporary buffers. These types of disks have almost the same basic configuration for recording, reproducing, and erasing information, and it is desirable to use a common drive device. However, each type of disk has different recording sensitivities and reproduction principles, and there are differences in the optimal values of energy per unit time and per unit area applied to the disk during recording, reproduction, and erasing. Therefore, when such different types of disks are handled by the same device, there is a problem that stable recording, reproduction, and erasing cannot be performed. [Object of the Invention] In view of the problems of the prior art described above, an object of the present invention is to stably record, reproduce, and erase multiple discs using the same device by adding a means for determining the types of multiple discs. An object of the present invention is to provide an optical information recording/reproducing device that performs the following steps. [Summary of the Invention] To achieve the above object, the present invention rotates a disk-shaped recording medium and irradiates the medium with a light beam to perform at least one of recording, reproducing, and erasing information. An optical information recording/reproducing device capable of loading a plurality of types of disk-shaped recording media, and a means for determining the type of the loaded medium, and a means for determining the type of the loaded medium, and a means for determining the type of the medium by the light beam according to the determined type. The invention is characterized by comprising means for changing the rotational speed of the medium so that the energy per unit time and per unit area given to the medium is optimized. [Embodiments of the Invention] Hereinafter, the present invention will be described in detail using Examples. FIG. 1 is a block diagram of an embodiment of an optical information recording/reproducing apparatus according to the present invention. In Figure 1, 4
are accessed in the radial direction of the disk by an optical head. 5 is a laser light source, 6 is a collimator lens that makes the light beam from the laser light source parallel, 7 is a beam splitter that reflects the reflected light from the disk 13, and 8 is a disk-shaped disk 13 for recording and reproducing the light beam. and an objective lens provided so as to be movable in both directions of arrow A for focus control during erasing and in both directions of arrow B for tracking control of laser light. In the case of a recording operation, a laser beam is irradiated onto the disk 13 through a collimator lens 6, a beam splitter 7, and an objective lens 8 from a laser light source 5 controlled by a laser modulator (not shown) and recorded. In the case of a reproduction operation, a laser beam with a constant output is emitted from the laser light source 5, and is irradiated onto the disk 13 in the same manner as in the recording process described above.The laser beam reflected by the disk 13 is passed through the objective lens 8 and the beam The light passes through the pritter 7, passes through the analyzer 9, and the condensing lens 10, and enters the light receiving element 11. The amount of reflected light is converted into an electrical signal by the light receiving element 11, and sent to the signal processing circuit 12 for signal reproduction. In the case of erasing operation, a laser beam with a constant output is output from the laser light source 5, and the collimator lens 6, beam splitter 7, and objective lens 8
Information recorded on the disk 13 is erased by irradiating the disk 13 through the light. The rotational speed of the disk is determined by a signal indicating the disk type being sent from the disk type detection section 1 to the controller 2, and the controller 2 instructing the disk rotation motor control circuit 3 to rotate the disk according to the disk type. controlled. The disc 13 is attached to the turntable 1 by the clamp 15.
7 and is rotated by a disk circuit motor 16 connected to the disk rotation motor control circuit 3. Figure 2 shows the disk type detection unit 1 in the embodiment.
FIG. In FIG. 2, 13 is a disk, 19 is a disk card cartridge into which the disk is inserted, 20 is a guide rail for inserting the disk card cartridge 19 into a drive device (not shown), 22a, 2
2b is a light shielding plate 21a attached to the card cartridge;
21b is a photo interrupter whose optical path is interrupted when a disk is inserted. FIG. 3 shows the photo interrupter 22a, 22.
This is an example of connection b. 25, 25' are LEDs,
26, 26' are phototransistors; 23, 26' are phototransistors;
24 is each photo interrupter 22a, 22b
This is the output signal from . The operation will be explained below with reference to the figures. First, in the disk card cartridge 19, if the disk 13 housed in the card cartridge is a ROM type disk, if the light shielding plates 21a and 21b are not attached to the disk card cartridge 19, the photo interrupters 22a and 2 will be removed when the cartridge is inserted.
Light from the LEDs 25, 25' of 2b enters the phototransistors 26, 26' without being blocked, and the control signals 23, 24 both become low level. In the case of a DRAW type disk, only the light shielding plate 21a attached to the disk cartridge 19 is attached, but the light shielding plate 21b is not attached. In this case, the photo interrupter 22a is activated when the disk is inserted.
The light from the LED 25 is blocked by the light shielding plate 21a, no light enters the phototransistor 26, and the control signal 23 becomes High level. The control signal 24 is at a low level similarly to the ROM type disk described above. In the case of an E-DRAW type disk, both light shielding plates 21a and 21b are attached to the disk cartridge 19. In this case, when the disk cartridge 19 is inserted, the photo interrupter 22a,
The light from LED 25, 25' of 22b is blocked,
No light enters the phototransistors 26, 26',
The control signals 23 and 24 are both at High level.Three types of output signals are output as described above. FIG. 4 shows an operational flow diagram of the optical information recording/reproducing apparatus according to the present invention. This operation is started when the disk is replaced and the power of the disk device is turned on27. First, the disk is installed 28, and then it is confirmed whether the installation is complete 29. If the disk is installed, the type of disk is detected by the disk type detection section 1, and an output signal is output 30. When the output signal is output, it is determined whether the type of the disk is a ROM type disk 31, and if it is a ROM type disk, the rotation speed corresponding to this disk is determined.
Output R ₁ to disk rotation motor control circuit 3
4. Finish 37. If it is not a ROM type disk, it is determined whether it is a DRAW type disk (32), and if it is a DRAW type disk, the rotation speed R ₂ corresponding to this disk is outputted (35), and the process is terminated (37). If it is neither a ROM type disk nor a DRAW type disk, determine whether it is an E-DRAW type disk.
- If it is a DRAW type disk, the rotation speed R ₃ corresponding to this disk is outputted 36, and the process ends 37. Even with ROM type disks, DRAW
If it is neither a type disk nor an E-DRAW type, it is determined that it is an error, 38, and a display is performed. Table 1 shows specific examples of the rotational speed during playback, recording, and erasing of the ROM type disk, DRAW type disk, and E-DRAW type disk described above.

〔Effect of the invention〕

As described above in detail, the optical information recording/reproducing apparatus according to the present invention is capable of stably operating a plurality of types of disks with different driving conditions using a single apparatus. Furthermore, by changing the rotational speed of the disk for each of the reproduction, recording, and erasing operations depending on the type of disk, it is possible to reproduce the optimum signal while keeping the output of the light source of the optical head constant.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of an optical information recording/reproducing apparatus according to the present invention. FIG. 2 is a perspective view of the configuration of the disk type detection section in the embodiment.
FIG. 3 is a connection diagram of the photo interrupter of the disk type detection section. FIG. 4 is an operational flow diagram of the optical information recording/reproducing apparatus according to the present invention. 13...Disk, 19...Disk cartridge, 20...Guide rail, 21a, 21b...
... Light shielding plate, 22a, 22b... Photo interrupter, 25, 25'... LED, 26, 26'... Photo transistor.

Claims (1)

[Claims] 1. Recording of information by rotating a disk-shaped recording medium and irradiating the medium with a light beam;
An optical information recording/reproducing device that performs at least one of playback and erasing operations is capable of mounting a plurality of types of disk-shaped recording media, and includes a means for determining the type of the mounted medium and a means for determining the type of the disc-shaped recording medium that has been loaded, and a means for determining the type of the loaded medium, and an optical information recording and reproducing apparatus, comprising: means for changing the rotational speed of the medium so that the energy per unit time and per unit area given to the medium by the light beam is optimized; .