JPH0465459B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an optical information apparatus for recording and reproducing information on an optical recording disk having guide tracks, and more particularly to an apparatus for performing track searching by track jumping.

Conventional structure and its problems A disk is formed using a photosensitive recording material,
This disk is rotated, and by irradiating it with light from a laser or the like focused on a minute diameter of 1 μm or less, signals are recorded at high density on the disk as unevenness, hole formation, or changes in density, etc., or being regenerated.

For example, optical video discs are well known among the above-mentioned technologies as devices for reproducing prerecorded signals at high density.

Furthermore, the technique for recording the above-mentioned signals is used in devices that create master discs for video discs.

Also, video signals, audio signals, digital signals, etc. are considered as recording signals.

In the optical recording/reproducing device, signals are recorded by irradiating the recording thin film on the disk with laser light to melt and evaporate the light irradiated portion of the thin film, or by changing the reflectance or transmittance of the thin film. Recording is then carried out. That is, it is common practice to thermally utilize the energy of laser light to change the optical properties of a recording material.

In order to perform high track density recording on the optical recording disk, guide tracks having a groove-like structure are provided in advance, and signals are recorded while applying tracking control to the guide tracks. The guide track reduces positional deviation of the recording light beam due to vibration of the device, and also allows signals to be recorded at any location on the optical recording disk. Conventionally, optical recording disks without guide tracks are
It was difficult to increase the track density due to problems such as the feeding accuracy of the optical pickup and the eccentricity of the disk.

By using a disk having an optically detectable guide track as described above, it is possible to obtain a high-density optical recording/reproducing device that is less affected by vibrations of the device, uneven feeding of the feeding mechanism, and eccentricity of the disk. can.

Furthermore, by recording a unique address for each track during cutting of the master disk, it is possible to randomly search for any desired track among all the tracks on the optical recording disk.

The guide track is selected depending on the content of the information to be recorded or the signal, but generally has a spiral or concentric shape with respect to the center of the disk.

In terms of track density, a spiral track is more advantageous than a concentric track. This is because, compared to the concentric circular track that feeds tracks intermittently in master cutting machines, the spiral track that feeds continuously does not generate vibrations due to track feeding, and is less affected by play in the feed screw mechanism. .

However, unlike concentric tracks, spiral track optical recording disks have one continuous track on the optical recording disk, so it is difficult to keep the optical head on a track at a predetermined address compared to concentric tracks. It's difficult to do. In order to concentrically track tracks at the same position on a spiral track, it is necessary to forcibly skip the aperture light of the optical head by one track. At this time, while the optical head is in the tracking state, a jumping signal with a predetermined amplitude is applied from the outside, and the optical head is swung in the radial direction of the optical recording disk, and when it leaves the guide track and reaches the next guide track, the brake is applied. This will cause the track to jump. For this reason, the number of jumped tracks is always accompanied by uncertainty because it depends on the tracking characteristics of the optical recording disk, such as the amplitude of the jumping signal, the timing of applying the brake, and the amplitude of the brake, and variations in the track pitch guide track width. This makes it difficult to perform a detailed search for tracks by jumping or to play back stills from the same track, and there are also problems such as not being able to confirm that jumping has been performed correctly, or having to wait for the disk to rotate for confirmation.

OBJECTS OF THE INVENTION An object of the present invention is to provide an optical information recording and reproducing method that can confirm that a track at a predetermined location is being accurately tracked in an optical recording disk having a spiral track, and that can improve jumping accuracy and reliability. It provides equipment.

Structure of the Invention In order to solve the above problems, the optical information recording/reproducing apparatus of the present invention is an optical information recording/reproducing apparatus for optically recording/reproducing information on an optical recording disk having a spiral guide track on which at least one address signal is formed. In an information recording/reproducing apparatus, an optical head for irradiating a recording/reproducing light beam onto a guide track, an address signal reading means for reproducing and reading an address signal of the guide track, and a jumping activation signal for generating the optical recording disk jumping activation signal. generating means, track jumping means for re-erasing the recording/reproducing light beam from the optical head onto the same track using the jumping activation signal, and determining whether jumping of the jumping means has been successfully completed based on the address information of the address signal reading means. and a jumping confirmation means to confirm that the
Track jumping is caused by the jumping start signal, and after jumping is completed, the address signal reading means reads the address signal of the track, and the jumping confirmation means performs one track jumping in the spiral direction. This is configured to check the address signal area formed on the optical recording disk in advance, just before the recording/reproducing light beam passes through the address signal area formed on the optical recording disk. Track jumping is started in response to the received signal, and after the jumping is completed, the address signal is immediately regenerated to confirm whether or not it is the target track, thereby improving the jumping accuracy and reliability. Jumping is started by detecting an index mark specially provided outside the information recording area, or by detecting a sector address in the case of an optical recording disk with a sector structure.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on the drawings. FIG. 1 shows an embodiment of track jumping according to the present invention, in which a predetermined location 2 of an optical recording disk 10 is
The optical head 15 is shown tracking the track of the optical head 15. FIG. 2 shows one embodiment of the arrangement of the optical head 15 and the index mark detector 16 to implement the track jumping of the present invention.

In FIG. 1, an optical recording disk 10 has a spiral track 11 provided in advance from the inner circumference to the outer circumference. The track 11 has two address signal areas 12 and 13 (shaded areas in FIG. 1). The truck address signal is 1 in the figure,
Examples are 2, 3, and 4. The index mark 14 is an identification mark provided on the inner track within the sector of the address area 12, and the index mark detector 16 in FIG. It is converted and detected.

In FIG. 1, the optical head 15 is tracking the track of the address signal 2, and changes tracks in response to a 1 track jumping command signal issued at an angle of θ from the center of the address area 12. . This angle θ is set so that the optical head 15 can jump before the center of the address area 13, as shown in FIG.
This corresponds to the angle at which the index mark detector 16 is advanced from the center of the address area 12, and as soon as the index mark detector 16 detects the index mark 14, the optical By swinging the head 15 in the radial direction of the optical recording disk at high speed, the recording/reproducing light beam can be jumped by an angle θ in front of the center of the address area 13 by an amount equivalent to one track.
Immediately after this jumping is completed, address signal area 1 is
By reading the address signal No. 3, it is determined whether the track where the optical head 15 is currently located is the target track.
By doing this, jumping can be performed with high reliability.

FIG. 3 is a block diagram of one embodiment of the above-mentioned jumping control system. The optical recording disk 10 is rotated by a motor 17. A reproduction signal obtained from the optical head 15 is amplified by a head amplifier 19, demodulated by an address signal reproduction circuit 22, and taken into a microcomputer 23 for control.

The optical head 15 is now on the track at a predetermined location.
Let's hold it still. At this time, the control microcomputer 23 outputs a static mode command signal a to the jumping starting circuit 20. The output of the index mark detector 16 is processed by an index mark detection circuit 18, and a jumping start circuit 20
trigger. The jumping starting circuit 20 synchronizes the index signal b and the static mode command signal a, and causes the optical head drive circuit 21 to start the optical head 1.
The tracking drive coil 24 of No. 5 is excited to swing the light beam of the optical head 15 in the direction of the inner diameter of the optical recording disk 10. Detecting that the optical head 15 has moved to the previous (inner) track, the control microcomputer 23 reads the address of the current track to the address signal reproducing circuit 22 and confirms that it is the destination address. do. This ensures correct jumping.

In this embodiment, an index mark is used to start jumping, but by dividing the guide track of an optical recording disk into a plurality of sectors,
The same applies when each sector has a sector address and jumping is activated upon detection of a specific sector address.

Further, in the embodiment, one track jumping has been specifically explained, but the same applies to jumping a plurality of tracks at once.

Effects of the Invention As is clear from the above description, according to the present invention, track jumping is performed immediately before the address signal area of a track using a jumping start signal generated from an optical recording disk, and immediately after jumping is completed, the address signal area is Since the address signal is read to confirm that it is the target track, highly reliable jumping is possible. This is particularly effective when tracking tracks at the same position of a spiral track by one track jumping.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of track jumping according to the present invention, and shows how the optical head follows a track. FIG. 2 shows the optical head and index mark detector for performing the operation shown in FIG. A diagram showing the positional relationship on the recording disk, and FIG. 3 is a configuration diagram showing one embodiment of the track jumping control system. 1, 2, 3, 4...Truck address signal, 10...
...Optical recording disk, 11...Track, 12,1
3... Address signal area, 14... Index mark, 15... Optical head, 16... Index mark detector, 18... Index detection circuit,
20...Jumping start circuit, 21...Optical head drive circuit, 22...Address signal regeneration circuit, 23
...Controlling microcomputer, 24...Tracking drive coil.

Claims (1)

[Claims] 1. It has a spiral guide track with an address signal formed thereon, and an area outside the information recording track area.
An optical information recording and reproducing apparatus for optically recording and reproducing information on an optical recording disk provided with index marks formed in a fan shape includes an optical head that irradiates the guide track with a light beam and reads out information; address signal reading means for reading out the address signal of the guide track from the information read by; jumping start signal generating means for detecting the index mark and generating a jumping start signal; track jumping means for jumping onto the same track in response to a start signal, and immediately after completion of jumping onto the same track, the address signal reading means reads the address signal of the track, and from this address signal, the jumping means jumps the track. Jumping confirmation means is provided for confirming that jumping onto the same track has been completed normally, and the jumping start signal generating means detects an index mark at a timing a predetermined time before the optical head reads the address signal. An optical information recording/reproducing device characterized in that the optical information recording/reproducing device is arranged at a position.