JPS6292295A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To recognize a reproducing start position with a stable accuracy by detecting the reproducing start position with the same information as recording position identifying information recorded on a recording track. CONSTITUTION:At a point area, such as the recording track 5c, etc., of a mandatory recording area 3 on a card shaped recording medium 1, a position identifying information 7 of four blocks, etc., same as a pre-recorded position identifying information 6 that is used when a data is recorded at the area except the mandatory recording area is recorded. In a reproducing time, the block of the information 7 is read out and when some failure are found, the next block having the same content is read out in order, and the reproducing start position is detected with a track number, etc. Therefore, the reproducing start position can be exactly recognized with the stable accuracy using a detection circuit used in a recording time without being influenced with the attachment of a dust, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an information recording and reproducing apparatus that can easily and accurately detect information when reproducing information.

[Conventional technology]

Conventionally, it is well known to record information on a recording medium having a plurality of information tracks to be recorded using magnetism, -X beam, etc. The format of these recording media is as follows:
Types such as disk-shaped, card-shaped, tape-shaped, etc. are known.

By the way, when recording information on the information track of the above-mentioned medium by focusing the original beam or magnetic flux using an optical head or a magnetic head, in order to record information on the target track, it is necessary to set the desired track before the recording operation. It is necessary to check whether the truck is

Therefore, usually the area where track information is to be recorded (hereinafter referred to as 1
In this application, it is possible to confirm the track by recording the rack number of some modulation method (for example, FM modulation method) [J:, 9) in the required recording area) and reading this track number. It is done.

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

The same information, considering the case where playback is not possible due to scratches etc.
That is, the present applicant has proposed a configuration in which the track number is recorded by repeating it 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 truck number can be confirmed is not always a constant position, the distance from the position where the truck is confirmed to the position where the truck is cleared is not always constant.

Therefore, 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 possible to position the start of information recording without error. The applicant has already proposed an information recording medium that allows accurate detection.

In this information recording medium, at least a code for identifying an information track and a code for each code indicating information from the position where the code is attached to the recording start position are provided 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, since the information from that position to the recording start position is read repeatedly, recording can be performed at an accurate position.

This method will be explained in detail below based on the drawings.

FIG. 4 is a schematic diagram showing a portion of a card-shaped information recording medium. In the figure, 1 is a card-shaped recording medium, 2a, 2b, 2
c, 2d, . . . are information tracks, 3 is an essential recording area of the information track, and 4 is an area outside the essential recording area, where a track number is assigned to identify the information track. Location identification information 6 is provided in the area 4 shown in FIG.
The information 6 has, for example, four information blocks,
Each information block includes at least information indicating the track number and information indicating the position from the information block to the required recording area.

FIG. 5(A) is a diagram showing an example of information contained in 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 indicating the number of information block. The number E is used to identify the information track from other tracks, and is an error detection code. As shown in FIG. 5 CB), for each information block, these information S, Bs, Tφ,
Contains E, sync mark S and track number T
The block number B+ is the same in each information block, but different information is recorded in each information block corresponding to the position of each information block. Along with this,
The false detection codes are also different.

The block number indicates information from each information block to the recording start position.

FIG. 6 shows a flowchart for positioning the start of recording. The recording process of the information recording medium shown in FIG. 4 will be explained according to this flowchart. First, during recording, a recording head accesses a track on an information recording medium, and first reproduces a portion of the trunk that includes an information block.

First, the sync mark of the first information block is detected, and it is determined whether or not there is an error in the following information, such as scratches, scratches, etc.
Check to see if it is not in a state where it cannot be read due to dust or the like. If there is an error in that information block, the subsequent information block is reproduced. If the information in the information block is correctly read, the track identification number of the information block is used to check whether the information block belongs to the target track. If it is confirmed that the track being played back is the desired track, the block number of the information block determined to be the desired track is recognized, and the number of information blocks in which the information block falls 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 be recorded and played back optically, the Dejima person in this case issued a special patent application in 1986-276942.
As shown in the above, since the original card is provided with a clock track for reproducing the clock, recording can be started by counting the number of clocks generated by, for example, PLL means in addition to the clock reproduced on this clock track. The location is known accurately.

[Problem that the invention seeks to solve]

By the way, when reproducing information recorded in the essential recording area 3 by the above-mentioned means, it is also necessary to accurately know the reproduction start position. Therefore, conventionally, a synchronization mark is recorded before the information on the recording track, and the synchronization mark is recorded by repeating it several times in case the synchronization mark cannot be reproduced due to dust, scratches, etc. on the recording medium. Ta. However, since the distance from the detection of the synchronization mark to the playback start position is not always constant, something like a cue code is included in the information to recognize the start of playback. In this case, the detection error depends on whether the cue code is recognized correctly or not, and it has been difficult to know the playback start position with stable accuracy until now.

[Means for solving problems]

In the information recording/reproducing apparatus of the present invention, in order to easily and accurately detect the reproduction position, an information recording medium on which position identification information having information indicating the recording start position is recorded in advance is used. At the same time, the same position identification information as the position identification information is recorded on the recording track together with the recording information,
At the time of reproduction, a method is adopted in which the reproduction start position is detected based on the position identification information recorded on the recording track. [Embodiment] The information recording and reproducing apparatus of the present invention will be described below.

First, specific advantages of the method of the present invention will be explained using an example in which the information recording/reproducing apparatus of the present invention is applied to an original card information recording/reproducing apparatus.

FIG. 1 shows an example of a card-shaped information recording medium 1o1a.

101b is a clock track, 102a and 102b are recording tracks, and 103 is a tracking track.
a, b, and c indicate three light beams split from one light source.

When recording information suddenly on the recording track 102 (I in the figure)
), beam C is used for tracking, and beam B is used to detect the recording start position outside the required recording area, and then recording is performed using beam B while reproducing the clock. In addition, the recording track 102
When recording information on the recording medium b (II in the figure), the beam a performs tracking, the beam C detects the recording start position outside the essential recording area, and then the beam b records while reproducing the clock.

Further, in order to reproduce the information recorded in the recording tracks 102a and 102b adjacent to the tracking track 103 in this way, a method as shown in (■) in the figure is used. That is, while beam b performs tracking, beam a and beam C simultaneously reproduce both recorded information. This is an advantageous method that can double the information transfer speed during playback.

However, in order to know the playback start position at this time, it is necessary to detect it with beams a and beam C, and the clock track 101 must be detected.
A problem arises in that the information on the recording start position previously recorded in a, a, 10, and b cannot be used simultaneously during reproduction.

Therefore, when recording information (■ in the figure), position identification information (corresponding to the information regarding the recording start position included in the clock tracks 101a and 101b in FIG. 1) having information indicating the recording start position is recorded in advance. Information recording medium (
(corresponding to the original card in Figure 1), and when recording information, the same position identification information as the above position identification information is used together with the recorded information (it suffices as long as the extracted information is the same, regardless of the shape of the recording pit etc.) recording track 102a.

102b, recording track 102m during playback
.

The above-mentioned problem can be solved by the method of the present invention, which detects the playback start position based on the position identification information recorded on the recording medium 102b.

Next, consider a case where the method of the present invention is applied to a more general information recording/reproducing device.

FIG. 2 is a schematic diagram showing a part of a card-shaped information recording medium, which is an embodiment of the information recording medium used in the information recording and reproducing apparatus of the present invention. Inside the meat, 1 is a card-like recording medium, 2m + 2b, 2c + 2d.

... is an information track, 3 is an essential recording area of the information track, and 4 is an area outside the essential recording area, which is an area where a track number is assigned to identify the information track. The area 4 shown in FIG. 2 is provided with position identification information 6, and the information 6 has, for example, four information blocks, and each information block includes at least information indicating a track number and information from the information block. Information up to the required recording area 3 is included.

Also, 5 a + 5 b e 5 c * 5 d
r ``'' is a recording track, and in area 3, the same information as each of the four information blocks of position identification information 6 previously recorded in area 4 is recorded prior to the recording information. This is the second
In the figure, it is represented by position identification information 7. Each information block has the configuration shown in FIG. 5, for example.

FIG. 3 shows a flowchart for positioning the start of reproduction. The reproduction process of the information recording medium according to the present invention shown in FIG. 2 will be explained according to this flowchart. First, upon reproduction, a reproduction head accesses a recording track of an information recording medium, and first reproduces a portion of this track that includes an information block. First, the sync mark of the first information block is detected, and it is checked whether there is an error υ in the information following it, for example, whether it is in a state where it cannot be read due to scratches, dust, etc.

If there is an error in that information block, the subsequent information block is reproduced. If the information in the information block is correctly read out, it is confirmed from the track identification number of the information block whether the information block belongs to the target track. If the track being played is confirmed to be the desired track, the block number of the information block determined to be the desired track is recognized;
Find out what number of information block the information block is. At that point, the position of the reproducing head relative to the recording medium can be accurately confirmed. After that, for example, PL
By counting the number of clocks generated by the L means, the playback start position can be accurately determined.

Although the explanation so far has been about card-shaped recording media, it is clear that the application is not limited to card-shaped recording media, but can also be applied to disc-shaped recording media, and information The recording method also includes magnetic method, f
It is clear that the present invention is also applicable to t, scientific methods, and other methods.

〔Effect of the invention〕

As explained above, by recording the same information that indicates the recording start position at the time of information recording, the playback position can be accurately known, and as described above, the recording start position detection device at the time of recording can be used as it is at the time of playback. Since it can be used to detect the playback start position, it has a great effect on making the device more compact and reducing costs.

[Brief explanation of drawings]

: Figure 1 shows the information recording and reproducing apparatus of the present invention using optical power.
This is an explanatory diagram showing a case where the present invention is applied to an information recording/reproducing device. FIG. 2 is a diagram showing an embodiment of an information recording medium according to the information recording and reproducing apparatus of the present invention, and FIG. 3 is a 70-chart diagram when the information recording medium is reproduced in the apparatus of the present invention. be. FIG. 4 is a schematic diagram of a conventional information recording medium, and FIG. 5 is a diagram showing information in the blocks of FIG. 4. FIG. 6 is a flowchart showing a recording process using the information recording medium of FIG. 4. 1: Card-shaped recording medium, 2&*2b*2ee2d: Information track, 3: Required recording area, 4: Area other than the required recording area,! 1) 11@5b+5C+y5d: recording track, 6: position identification information, 7: position identification information. Agent Patent Attorney Jo Taira Yamashita Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] (1) Use an information recording medium on which position identification information having information indicating the recording start position is recorded in advance, and when recording information, record the same position identification information as the position identification information on the recording track along with the recording information. An information recording/reproducing apparatus characterized in that, during reproduction, a reproduction start position is detected based on position identification information recorded on a recording track.