JP2862514B2 - Information recording method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recording information. 2. Description of the Related Art It is well known that information is recorded on a recording medium having a plurality of information tracks to be recorded by using a magnet, a light beam or the like. As a form of these recording media, a disk-shaped, card-shaped, tape-shaped, and the like are known. [0003] By the way, in the information track of the above medium,
When recording with a light beam or a magnetic flux by using an optical head or a magnetic head to record information on a target track, it is necessary to confirm whether the track is a desired track before the recording operation. is there. Therefore, usually, a track number is recorded in an area where the information of the track is to be recorded (hereinafter, referred to as an essential recording area) by any modulation method (FM modulation method), and by reading this track number, the track number is read. It is done to make sure. In particular, the present applicant has proposed a configuration in which the same information, that is, the track number is repeatedly recorded several times, in consideration of the fact that the track number cannot be reproduced due to dust or scratches on the recording medium. ing. [0005] By the way, after a target track can be confirmed by the above-described means, it is necessary to confirm a position at which recording of the track is started, that is, a first position of an essential recording area. Becomes However, as described above, when a plurality of identical track numbers are consecutively assigned to one track, the track is identified depending on the position of the track number that could be identified. Since the distance from the specified position to the first position of the essential recording area is determined, that is, 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 always constant. Not
It was difficult to confirm the first position of the essential recording area. SUMMARY OF THE INVENTION An object of the present invention is to provide a plurality of codes for identifying information tracks, such as track numbers, continuously outside the essential recording area of the information tracks. It is an object of the present invention to provide an information recording method capable of accurately detecting the start of recording of information without error when recording information on such an information recording medium. The object of the present invention is to provide a plurality of tracks for recording information, a recording area for recording information provided in each track, and a plurality of information blocks continuously provided outside the area. In each information block, a code for identifying the track, a code indicating a recording start position of the information in the recording area, and an error detection code for both codes are recorded in advance. In a method for recording information on a medium,
In the step of reproducing each code in the block in order from the head block of the plurality of information blocks, the step of detecting each of the reproduced codes by the error detection code, and the step of detecting an error. If detected,
Reproducing each code in the next block, and, if there is no error in the reproduced code, recognizing a track number based on a code for identifying a track and based on a code indicating the recording start position. And determining the recording start position by counting the reproduction clock. FIG. 1 is a partial schematic view showing an example of an information recording medium used in a recording method according to the present invention. In the figure, 1 is a card-shaped recording medium, 2a, 2b, 2c, 2d,
.. Are information tracks, 3 is an essential recording area of the information track, 4 is an area outside the essential recording area, and is an area to which a track number for identifying the information track is attached. The area 4 shown in FIG. 1 has four information blocks, and each information block includes at least information indicating a track number and information indicating a recording start position. FIG. 2A shows an example of information included in this one information block. In the figure, S is a sync mark, B # is a code (block number) indicating what information block this information block is, and T # is a code (track number) for identifying an information track from other tracks. , E are error detection codes. As shown in FIG. 2A (B), these information S, B #, T #, and E are included in each information block,
Although the sync mark S and the track number T # are the same in each information block, the block number B # records different information in each information block corresponding to the position of each information block. Accordingly, 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 recording start position. According to this flowchart, the recording process of the information recording medium shown in FIG. 2 will be described. First, at the time of recording, the recording / reproducing head accesses a certain track of the information recording medium, and first reproduces a portion of the track including the information block. First, the sync mark of the first information block is detected, and it is checked whether there is an error in the information following it, for example, whether the information is not readable due to scratches, dust or the like. If there is an error in the information block, the subsequent information block is reproduced. If the information of the information block is correctly read, the track number of the information block
It is checked whether the information block is for the target track. If the track being reproduced is confirmed to be the desired track, the information block number determined to be the desired track is recognized, and the order of the information block is known. At that time, the position of the recording head that performs recording with respect to the recording medium can be accurately confirmed. Thereafter, for example, in the case where the recording medium is a so-called optical card capable of optically recording / reproducing, a clock is reproduced on the optical card as shown in Japanese Patent Application No. 59-276942 by the present applicant. The recording start position can be accurately determined by counting, for example, the number of clocks generated by the PLL means in the clock reproduced by the clock track. [0010] Even when one track is divided into several parts and recorded, the first recording position can be accurately determined.
By counting the number of clocks, any number of divisions can be recorded. Further, by increasing the number of the above blocks, detection errors due to dust, scratches, etc. can be eliminated.
Increasing the number of bits for error detection can reduce the possibility of erroneous confirmation. In addition to the above-described embodiment, various means can be used as means for confirming the position of the information block to determine the start of recording. Further, in the present application, the recording medium can be applied to any of optical and magnetic recording means, and the recording track has a linear shape in a card-like medium or an annular shape in a disk-like medium. It may be. As described above, according to the present invention, the recording start position of information can be accurately detected without errors, and the recording reliability is improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of an information recording medium used in a recording method of the present invention. FIG. 2A is a diagram showing the contents of one information block;
B is an overall view of a plurality of information blocks. FIG. 3 is a flowchart for explaining the recording method of the present invention. [Description of Signs] 1 Card-shaped information recording medium 2a, b, c, d Information track 3 Essential recording area

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroshi Matsuoka 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Kazuo Minoura 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon (56) References JP-A-61-208676 (JP, A) JP-A-61-264559 (JP, A) JP-A-58-177753 (JP, A) JP-A-60-50667 (JP, A A) JP-A-60-50665 (JP, A) JP-A-60-107771 (JP, A) JP-A-52-28231 (JP, A) JP-B-58-16545 (JP, B2) (58) Survey Field (Int.Cl. ⁶ , DB name) G11B 20/12-20/12 103

Claims (1)

(57) [Claims] A plurality of tracks for recording information, provided in each track, a recording area in which information is recorded, and a plurality of information blocks provided continuously outside the area, each information block A method for recording information on an information recording medium in which a code for identifying the track, a code indicating a recording start position of the information in the recording area, and an error detection code for both codes are recorded in advance. In the above, a step of reproducing each code in the block by a recording / reproducing head in order from a head block of the plurality of information blocks; a step of detecting an error of each reproduced code by the error detection code; in the error detection step, when an error is detected, the steps of reproducing the respective symbols in the next block, wherein when there is no error in each code that is reproduced, the track
When the track number is recognized based on the code
The playback clock is determined based on the code indicating the recording start position.
Determining the recording start position by counting clocks .