JPS61280077A - Information recording medium - Google Patents

Abstract

PURPOSE:To detect accurately and without error the starting position of the recording of information by providing, in one information block, a code identifying the information track and a code that shows the information between the position where the code is attached and the starting position of recording for each of the code. CONSTITUTION:Plural groups of identification numbers to identify one track from others are consecutively provided in one recording track that is for information-recording. The information indicating the starting position of recording is included in each one of the said groups. Therefore, if the currently reproduced track is confirmed to be the desired one, the block number of the information block judged to be the desired block is recognized, and the order number of the said block is identified. At this point of time, the position of the recording head ready to record in relation with the recording medium is accurately confirmed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an information recording medium having a plurality of information tracks to be recorded.

[Prior art]

2. Description of the Related Art Conventionally, it is well known that information is recorded on a recording medium having a plurality of information tracks to be recorded using magnetism, a light beam, or the like. Known forms of these recording media include disks, cards, tapes, and the like.

By the way, when recording information by focusing a light beam or magnetic flux on the information track of the above-mentioned medium using an optical head or a magnetic head, in order to record information on the target track, the track must be aligned with the desired position before the recording operation. It is necessary to confirm whether it is a truck or not. Therefore, usually, a track number is recorded in an area where track information is to be recorded (hereinafter referred to as an essential recording area in this application) by some modulation method (for example, FM modulation method), and by reading this track number, Checking the track is being done.

In particular, this track number is garbage on the recording medium.

Considering that playback is not possible due to scratches, etc., the same information,
That is, the applicant has proposed a configuration in which the track number is recorded several times.

Therefore, after the target track is confirmed by the above-mentioned means, it is necessary to confirm the position at which recording of the track is started, that is, the first position of the essential recording area. However, as mentioned above, when multiple identical track numbers are consecutively assigned to one track, depending on the location where the track number was assigned, which can be confirmed,
The distance from the position where the track is confirmed to the first position of the required recording area is determined. In other words, since the position where the track number can be confirmed is not always constant, the distance from the position where the track is confirmed to the writing position is not always constant.

[Summary of the invention]

It is an object of the present invention to detect the start of information recording in an information recording medium in which a plurality of codes for identifying information tracks, such as track numbers, are consecutively provided outside the essential recording area of the information track. It is an object of the present invention to provide an information recording medium that can accurately detect positioning without error.

In the information recording medium according to the present invention, at least a code for identifying an information track and, for each code, a code indicating information from the position where the code is attached to the recording start position are included in one information block. A plurality of information blocks are continuously provided outside the essential recording area of the information track.

Therefore, no matter which information block is used to confirm the information track, information from that position to the recording start position is read at the same time, so recording can be performed at an accurate position. The present invention will be explained in detail below.

〔Example〕

FIG. 1 is a partial schematic diagram showing an embodiment of an information recording medium according to the present invention. In FIG. 0, l is a card-shaped recording medium, 2 a ,
2 b , 2 c , 2 d , ---- are information tracks, 3 is an essential recording area of the information track, and 4 is an area outside the essential recording area. It's a castle. The area 4 shown in FIG. 1 has four information blocks, and each information block includes at least information indicating the track number and information from that information block to the essential recording area.

FIG. 2(A) is a diagram showing an example of information included in this one information block, where S is a sync mark, B# is a number indicating the number of this information block, and T # is a number for identifying the information track from other tracks, and E is an error detection code. As shown in FIG. 2(B), for each information block, these pieces of information S, B#
,T#.

E, sync mark S and track number T
# is the same in each information block, but the block number B# records different information in each information block corresponding to the position of each information block. Along with this,
The error detection codes are also different. The block number indicates information from each information block to the recording start position.

FIG. 3 shows a flowchart for positioning the start of recording. The recording process of the information recording medium shown in FIG. 2 will be explained according to this flowchart. First, during recording, the recording head accesses a track on the information recording medium, and first reproduces the portion of this track that includes the information block.First, the sync mark of the first information block is detected, and then It is checked whether there is any error in the information, for example, whether it is not unreadable due to scratches, dust, etc. If there is an error in the information block, the following information block is reproduced. If the information in the information block is read correctly, the track identification number of the information block indicates that the information block is the target track. Check to see if it is. If the track being reproduced is confirmed to be the desired track, the block number of the information block determined to be the desired track is recognized, and the number of the information block is determined. At that point, the position of the recording head that performs recording relative to the recording medium can be accurately confirmed.

After that, for example, in the case where the recording medium is a so-called optical card that can record and reproduce optically, the applicant filed a patent application filed in 1983.
As shown in No. 278942, since the optical card is provided with a clock track for reproducing the clock, recording is started by counting the number of clocks generated by, for example, a PLL means on the clock reproduced by this clock track. The location is known accurately.

Furthermore, even when one track is recorded by dividing it into several parts, the first recording position can be accurately determined, so by counting the number of clocks, it is possible to record by dividing into any number of parts.

Furthermore, by increasing the number of blocks mentioned above, it is possible to eliminate detection errors due to dust, scratches, etc., and by increasing the number of bits for error detection, it is possible to reduce the possibility of erroneous confirmation.

In addition to the embodiments described above, various means can be used to confirm the position of the information block and determine the position to start recording. Furthermore, in this application, the recording medium can be applied to either optical or magnetic recording means, and the shape of the recording track can be a linear one in a card-shaped medium,
Alternatively, it may be an annular shape in a disk-shaped medium.

As explained above, according to the present invention, the recording position of information can be detected accurately without error, and the reliability of recording can be improved.

[Brief explanation of drawings]

1 and 2 (A) and (B) are diagrams showing an embodiment of the information recording medium according to the present invention, and FIG. 3 is a diagram showing the process for recording on the information recording medium according to the present invention. FIG. 2 is a flowchart diagram illustrating an example. 1-111 card recording, medium, 2a, 2b, 2c. 2d---1 information track, 3-111 required recording area.

Claims (1)

[Claims] (1) A recording track for recording information is provided with a plurality of consecutive sets of identification numbers for distinguishing the track from other tracks, and each of the plurality of sets has a number indicating the start of recording. An information recording medium characterized by containing information indicating a position.