JPS6381633A - Optical recording medium - Google Patents

Abstract

PURPOSE:To allow the recording direction of data and the reading direction of data to be noncoincident and the read an optional data area in an optional direction by providing plural band data areas in parallel, recording the data in the respective data areas in a certain direction in a certain order respectively and recording identification information in the respective data areas. CONSTITUTION:At first a reading head reads a left end mark 5 so as to realize that the reading head positions on the left end. Next the data d(0)-d(n-1) is read in order d(0)-d(n-1) and stored in a buffer memory in ascending order of addresses. The read can be executed in the same way in the opposite direction. The contents of the buffer is transferred to a host computer in ascending order of addresses. Thus the data in plural band data areas can be read in the optical direction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an optical recording medium called an optical memory card that records or reads data using, for example, a laser beam.

(Prior Art) Conventionally, the one shown in FIG. 4 has been considered as an optical memory card that records or reads data using, for example, a laser beam. That is, a data recording section 2 is formed at a predetermined portion on the surface of the card base 1 along its longitudinal direction, and this data recording section 2 has a plurality of band-shaped data areas (this (referred to as a band)
3 are provided in parallel. In each band 3, optical data is arranged and recorded in a matrix.

That is, data is digitally recorded by making a hole called a bit using, for example, a laser beam or the like, with the state of the hole being made as "1" and the state of not being made as "0".

FIG. 5 shows only band 3. Now, when reading data recorded on band 3, assuming that the reading head of the card reader is initially in position 4, the reading head first reads the data while moving from left to right along band 30. , and sequentially transfers the data to a host computer, etc. When the reading of band 30 is completed,
The reading head moves to the next higher band 31, and then reads data while moving from right to left along this band 31, and sequentially transfers the data. When the reading of band 31 is finished, the read head returns to the next higher band 3.
2, and then reads data while moving from left to right along this band 32, and sequentially transfers the data.

However, in such an optical memory card, as is clear from the above description, the data recording order (recording direction) must match the moving direction of the reading head. That is, as shown in FIG. 5, data is recorded in the band 30 in order from left to right and read in this direction.
1, data must be recorded in order from right to left and read in this direction. Therefore, it is not possible to read any band in any direction. For example, when reading band 30, with the read head at the right edge, then band 3
2, the band 32 cannot be read until the reading head has been moved once to the left end, and the reading speed becomes extremely slow.

FIG. 6 shows the conventional data recording direction and the corresponding data reading direction in each band 3, with solid line arrows indicating the data recording direction and broken line arrows indicating the data reading direction.

(Problems to be Solved by the Invention) As described above, the data recording direction and the data reading direction must match, and therefore, arbitrary data mtil cannot be read in any direction. There is a drawback.

Therefore, the present invention aims to eliminate the above-mentioned drawbacks, and is an optical system that does not require the data recording direction and the data reading direction to match, and enables reading any data area in any direction. The purpose is to provide recording media.

[Structure of the Invention] (Means for Solving the Problems) The optical recording medium of the present invention has a plurality of strip-shaped data areas provided almost parallel to each other, and each data area has a certain amount of data in a certain direction. It is characterized in that optical data is recorded in order, and identification information is recorded at both ends of each of the data areas to identify the end.

(Operation) By reading the identification information prior to reading data, it is possible to determine whether the position of the reading head is, for example, at the left end or right end. Since the data is recorded in a certain direction and in a certain order, for example, the read data can be
By providing a buffer 7 memory capable of storing one data area in the reading device and changing the order in which the read data is written to this buffer memory according to the above judgment result, the data recording direction and the data reading direction can be changed. They do not need to match, and any data area can be read in any direction.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. Note that the same parts as those in FIG. 4 will be described with the same reference numerals. FIG. 1 shows band 3 of an optical memory card according to the present invention.
It shows an enlarged state. It is assumed that n bytes of data are recorded in band 3, and 0.1 bytes are recorded from the left.
．． Assuming a number of 2...n-1, 1 byte of data corresponding to number 1 is expressed as d(1). Further, at both ends of the band 3, identification information for identifying the respective ends, such as a left end mark 5 and a right end mark 6 for identifying the left end and the right end, are recorded.

FIG. 2 shows the structure of the buffer memory 7 that stores data for one band, and has a capacity of n bytes, which corresponds to the amount of data for one band.

This buffer memory 7 is provided in a card reader (not shown). Note that the starting address of this buffer memory 7 is indicated by ADDR.

Now, consider the case where data is read from the left end of band 3 toward the right end. First, the left end mark 5 is read by the reading head, and it is recognized that the reading head is located at the left end. Next, the data is d (0), d (1),...
. . d(i), but if these data are stored in ascending order starting from address ADDR in the buffer memory 7, these data will be read as ADDR+O, ADDR+1 . ADDR+
2°...ADDR+ When the right end of band 3 has been read, the data will be stored in the buffer memory 7 in the state shown in FIG. 2.

Conversely, when reading data from the right end to the left end of the band 3, the right end mark 6 is first read by the reading head, and it is recognized that the reading head is located at the right end. Next, the data are d (n-1), d (n-2), etc.
...d (i), but if this is stored in the buffer memory 7 in descending order from address ADDR+(n-1), these data will be read as ADDR+(n-1, AD
DR+ (n-2).

. . . When the data is stored in the position of ADDR+i and is finally read from the left end to the right end as described above, the contents of the data stored in the buffer memory 7 are as shown in Fig. 2. It will be similar. After the reading is completed, if the contents of the buffer memory 7 are transferred to the host computer in ascending order starting from address ADDR, the host computer will read d (0), d (1), . . . regardless of the reading direction.
The data will be received in the order of...

According to such an optical memory card, by reading the left end mark 5 or the right end mark 6 before reading data, it is possible to determine whether the reading head is at the left end or right end. Since the data is recorded in a certain direction and in a certain order, a buffer memory 7 that can store one band of read data is provided in the card reader, and the data is read into this buffer memory 7 according to the above judgment result. By changing the order in which data is written, the data recording direction and the data reading direction do not have to match, and any band can be read in any direction.

That is, the recording direction of data for each band 3 is a fixed direction (for example, from left to right) as shown by the solid line in FIG.
The data reading direction for this can be from left to right or from right to left as shown by the broken line in FIG. 3, and the same reading result can be obtained in the end. Therefore, for example, in FIG. 5, if you want to read the band 30 and then read the band 32 with the reading head at the right end, you can leave the reading head as it is without moving it to the left end as in the conventional case. The band 32 can be read at 100 kHz, which significantly increases the reading speed.

[Effects of the Invention] As detailed above, according to the present invention, the data recording direction and the data reading direction do not have to match, and any data area can be read in any direction. It is possible to provide an optical recording medium.

[Brief explanation of the drawing]

Figures 1 to 3 are for explaining one embodiment of the present invention; Figure 1 is a diagram showing the data structure of a band;
The figure shows the structure of the buffer 7 memory, Figure 3 is a diagram explaining the data recording direction and the corresponding data reading direction, Figure 4 is a configuration diagram of an optical memory card, and Figure 5 is a diagram showing the conventional structure of the optical memory card. FIG. 6 is a diagram illustrating a data reading method, and is a diagram illustrating a conventional data recording direction and a corresponding data reading direction. 1...Card base, 2...Data recording section, 3...Band (data area), 5...
... Left end mark (identification information), 6 ... Right end mark (identification information), 7 ... Buffer memory. Applicant's Representative Patent Attorney Takehiko Suzue Figure 3 Figure 6 Figure 4 Figure 5

Claims (1)

[Claims] A plurality of strip-shaped data areas are provided approximately in parallel, optical data is recorded in each of these data areas in a certain direction and in a certain order, and end portions are provided at both ends of each of the data areas. What is claimed is: 1. An optical recording medium characterized by recording identification information that allows identification.