JPS60223036A - Optical information recording method - Google Patents

Abstract

PURPOSE:To attain the re-recording of a recording medium and to improve the economical properties of an optical information recording method, by erasing a recording track to which no recording is needed and at the same time using an area within an adjacent guard band as a new recording area. CONSTITUTION:The undesired recording pits 4a-4f of recording tracks 3 and 5 among those tracks 3, 5 and 6 are buried into band-shaped erasion pits 7a and 7b formed by the heat of a laser beam. Then pits 8a-8c are formed newly and adjacently to the pit 7b. Thus a recording track 9 is formed. The pits 8a-8c perform the 2nd recording, and pits 7a and 7b serve as a part of a guard band 8. In this case, the guide grooves in the pits 7a and 7b are available for the 3rd and 4th recording actions.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to an optical information recording method for a recording medium that has a recording track and a guard band and can provide optical changes as recorded information.

(Background of the Invention) As the above-mentioned recording medium, a disk-shaped recording medium is known in which a thin film of tellurium oxide (Tea) is formed on a substrate by a process such as vapor deposition or coating. A recording track is formed on the track, and recording is performed in the form of pits, etc. on this track.

To explain a part of such a recording medium as shown in FIG. 1, a disk-shaped recording medium 1 is formed with a guide a2, and pits 4a to 4h are formed along the guide groove 2 to absorb the heat of the laser beam. formed by the recording track. The interval between the guide grooves 2 is 1.5 .mu.m, and the width of the formed focus is, for example, 0.5 .mu.m.The region 8 between each recording trunk is generally called a guard band.

By the way, as described above, forming a focus on such a recording medium is done by heating the recording layer, so changes in the recording layer cannot be restored.

The drawback was that it could not be re-recorded.

Furthermore, this type of recording medium is generally expensive and lacks economic efficiency because it allows only one-time recording.

(Object of the Invention) An object of the present invention is to obtain a recording medium as described above that is re-recordable.

(Summary of the Invention) The present invention provides a recording medium that has a recording track and a guard band and is capable of applying an optical change as recorded information. This is an optical information recording method that improves economical efficiency by using an area within the guard node adjacent to the corresponding portion as a new recording area. , (Example) FIG. 2 is a partial plan view of a recording medium subjected to the method of the present invention, in which the same parts as in FIG. 1 are denoted by the same reference numerals.

Recording tracks 3, 5, 6, . . . on which bits 4a to 4h in FIG. 1 are formed. Of these, the pits 4a to 4f, which are unnecessary records in the recording trunk 3.5, are band-shaped erased pits formed by the heat of the laser beam. It is buried in a and 7b. New pins 1-3 are added adjacent to the band-shaped erase bit 7b.
a, 13b, gc are formed, and a recording track 9 is formed. Note that the band-shaped erase pits 7a and 7b are sufficient if the unnecessary vias 42 to 4f are filled, and for example, the erase pits 7a and 7b are sufficient to fill in the unnecessary vias 42 to 4f, and for example, the erase pits 7a and 7b are used to erase data recorded on track address information, etc. It is preferable to leave the blank part. In other words, it is possible to know the type of information that was later buried by the Fugu section.

That is, recording track 3 on which the first recording was performed,
Bits 8a, 8b, and 8c are created in the area that was the guard band in the first recording, and this becomes the second recording, and the band-shaped The erase pits 7a and 7b become part of the guard band 8. Note that at this time, it is possible to use the guide grooves in the band-shaped erase pits 7a and Tb, and it is also possible to newly erase 3
It is also possible to record for the fourth time.

An apparatus for implementing such a method is shown in FIG.

A recording medium 1 has a transparent acrylic substrate 11 on a recording layer 10.
It is rotated by a spindle motor 12 at a constant linear speed. The recording layer 10 is made of selenium with tellurium deposited on both sides. A laser beam from a laser generator 13 consisting of a semiconductor laser is converted into a parallel beam by a collimator lens 14, is incident on an optical path changing reflector 16 via a beam splitter 15, and is further focused by an objective lens 17 onto a recording layer 10. irradiated.

The laser beam is moved in the radial direction of the recording medium 1, and concentric or spiral recording tracks are formed on the recording medium 1.

On the other hand, the recording track of the recording medium 1 is irradiated with a laser beam whose intensity is sufficiently weaker than that during the recording described above, and the signal is reproduced. The reading light (reflected light) of the recording track on the recording medium 1 is transmitted to the objective lens 17, the reflecting mirror 16 . The light is supplied via a beam shifter 15 and a lens 18 to a detector 19 consisting of a photodiode. A reproduced signal is obtained from this detector 19, and error signals for focus servo and tracking servo are generated by processing the output signal of detector 19.

In the above-mentioned apparatus, in order to realize the method of the present invention, it is possible to optically change all the recording tracks of the recording medium 1 and rewrite all the information. It is effective to record information separately in sectors and rewrite it for each sector. In that case, if you put information on how many times that sector has been rewritten in the header of each sector, information can be recorded and played back on the newly formed recording track based on that information. It is easy to move the device in the radial direction of the recording medium so that the device follows. That is, in this case, it is sufficient to apply a predetermined amount of bias to the tracking actuator.

When a series of focuses occur, it is necessary to change the signal processing depending on whether the new pit is formed almost in contact with the band-shaped erased focus or when it is relatively far away.
This information can also be handled as described above if it is stored in the puffer fish section. In the above-mentioned signal processing, which detects the amount of light incident on a pair of light-receiving elements, such as the far-field method, tracking is performed by separately determining the magnitude relationship of the output signal of each light-receiving element and the direction of change. And pits can be created one after another.

The recording medium described above is not limited to a disk shape, but may also be a drum shape, and the recording form is not limited to a pit shape. It is also possible to change the rate.

(Effects of the Invention) As described above, according to the present invention, it is possible to re-record on a recording medium, which is advantageous in terms of economy.

[Brief explanation of the drawing]

Figure 1 is a partial plan view of a typical recording medium, and Figure 2 is a partial plan view of a typical recording medium.
FIG. 3 is a partial plan view of a recording medium subjected to the method of the present invention.
The figure is a side view of an optical system for implementing the method of the present invention. [Explanation of symbols of main parts] 1...Recording medium, 3.5.6.9...Recording track, 4a to 4h, 8a, 8b---Pit, 7a, 7b...
- Band-shaped pit, 8...Gart band. Applicant Nippon Kogaku Co., Ltd. Agent Takao Watanabe Figure 3

Claims (1)

[Claims] In an optical information recording method for a recording medium having a recording track and a guard band and in which an optical change is applied as recorded information, when recording is unnecessary, an optical change is applied to the entire corresponding part of the recording track, and the method includes: , an optical information recording method characterized in that an area within the guard band adjacent to the relevant portion is used as a new recording area.