JPS61242373A - Data recording and reproducing method - Google Patents

Abstract

PURPOSE:To shorten a data reproducing time by changing the direction of data array for each N rows (N: natural number of >=2) when data are recorded on an optical card in plural rows and then reproducing N rows of these data at a time. CONSTITUTION:When data are recorded in plural rows, the direction of data array is changed for each N rows. When these data are reproduced, N pieces of light beams are irradiated at the side of E of recording tracks 31-3N. Then an optical card 1 is shifted toward (a) for simultaneous reproduction of N rows of data. When the reproduction is through with tracks 31-3N, N pieces of beams are shifted toward (c) by N rows and irradiated to the side F of recording tracks 3N+1-32N. The card 1 is moved toward (b) for simultaneous reproduction of N rows of data up to the tracks 3N+1-32N. Thus the simultaneous reproduction of N rows of data is repeated to perform reproduction of data at a high speed with no idle feed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a data recording and reproducing method, and more specifically, the present invention relates to a data recording and reproducing method, and more specifically, a method for recording data in a plurality of columns on a card-shaped optical recording medium,
Also regarding how to play.

[Prior art]

2. Description of the Related Art Conventionally, various types of media such as disks, cards, and tapes have been known for recording data using light and for reading recorded data. Among these, card-shaped optical recording media (hereinafter referred to as optical cards) are expected to be in great demand as small, lightweight, easily portable media with a large storage capacity.

In the above-mentioned optical card, data is recorded as an optically detectable recording pit string by scanning a preset recording track on the card with a light beam that is modulated according to recording data and focused on a minute spot. Ru. At this time, in order to accurately record data without causing problems such as crossing recording pit rows, the irradiation position of the light beam must be controlled in a direction perpendicular to the scanning direction (auto tracking, hereinafter referred to as AT). It was necessary to do so. In addition, focus control (auto focusing, hereinafter referred to as AF) was also performed to accurately focus the light beam onto the card. Furthermore, when reproducing recorded data, the recording pit array is scanned with a light beam having a constant power at a level that does not allow data to be written on the optical card.

FIG. 6 is a schematic plan view showing an example of such an optical card, in which 1 is an optical card, 2 is a data recording section, 31-32 1
Reference numeral 33 denotes recording tracks provided in a plurality of columns in the data recording section 2. When recording data on such an optical card 1, the optical card 1 and the light beam are moved relative to each other. Such a conventional data recording and reproducing method will be explained with reference to FIG. FIG. 7 is a partially enlarged plan view of the optical card, and parts common to those in FIG. 6 are given the same reference numerals and detailed explanations will be omitted. Also recording track 31.

37. 33, -1-- arrows indicate the data arrangement direction. First, a light beam is irradiated onto a portion A of the recording track 31, and as the optical card 1 moves in the direction of arrow C, data is recorded from A to B. When reaching the recording track 32, data recording is temporarily stopped and the optical card is moved in the direction b while sending the light beam one track in the direction of arrow C.
Record data from C to D. By repeating such operations, data is recorded on the optical card in a plurality of columns in which the data is arranged in the same direction. Data reproduction was also performed by light beam scanning similar to that used during recording.

However, in the conventional data recording and reproducing method as described above, especially during the reproduction process, each time one column is reproduced, the optical card is moved to the opposite side without performing reproduction.
This has the drawback that it requires so-called empty feed and takes time for playback.

[Summary of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a data recording and reproducing method that solves the drawbacks of the prior art and allows high-speed data reading.

The above object of the present invention is, when N is a natural number of 2 or more,
This is achieved by recording data in a plurality of columns on a card-shaped optical recording medium with the data arranged in different directions every N columns, and simultaneously reproducing the data recorded in the N columns.

〔Example〕

Embodiments of the present invention will be described in detail below using one drawing.

FIG. 1 is a partially enlarged plan view of an optical card illustrating the basic concept of the data recording method of the present invention.

In the figure, 1 is an optical card, 2 is a data recording section, and 31.

32, -----. 3N, 3N, 1.3N+2l---
132N1 32N, l.

-111 indicates a recording track, and the arrow within the recording track indicates the direction in which data is arranged.Thus, the feature of the present invention is that when data is recorded in a plurality of columns,
The reason is that the data arrangement direction is changed every N columns (N is a natural number of 2 or more).

When recording data, first move the light beam to track 3.
Illuminate the E side of I, and record data from the E side to F (Ill) by moving the optical card 1 relatively in the direction of arrow C.Next, data recording is temporarily stopped, and the light beam is directed toward arrow C. The optical card is moved in direction b while being fed by one row in the direction of direction, and a light beam is irradiated on the E side of the recording track 32.Then, the optical card is moved again in direction C, and data is recorded from the E side to the F side. .By repeating this operation N times,
On the optical card 1, N columns of data are recorded in the same direction.

When the light beam reaches the F side of the recording track 3N, only the light beam is moved in the C direction without emptyly feeding the optical card, and the light beam is irradiated onto the F side of the recording track 3N. Then, while moving the optical card l in the b direction,
Data is recorded from the F side to the E side of recording track 3N.1. Such recording from the F side to the E side is repeated N times from recording track 3N, 1 to 32+4, and from recording track 32111, recording from the E side to the F side is started again. In this way, recording is performed in which the data arrangement direction differs every N columns.

Next, in order to reproduce the data recorded as described above, N optical beams are irradiated onto the E sides of the recording tracks 31 to 3N, respectively, and the optical card l is moved in the C direction to Play data simultaneously. When the reproduction of the recording tracks 31 to 3)l is completed, the N optical beams are moved in the C direction by N columns to reproduce the recording track 3N. Irradiate the F side of 1 to 32N, respectively. The optical card 1 is then moved in the b direction to simultaneously reproduce N columns of data from recording tracks 3N.1 to 32N. By repeating such simultaneous reproduction of N columns, it is possible to reproduce data at high speed without skipping.

Next, the present invention in the case of N; 2 will be explained. FIG. 2 is a schematic plan view of an optical card used in the present invention. In FIG.
, 242. 243, ---- and a tracking track 25. which is formed in a continuous linear shape. ．． 252, --
-- are arranged alternately at equal intervals. And a recording track 23 for recording data between each track.
1.

232. 233,---1 is provided.

FIG. 3 is a perspective view showing a part of the configuration of a data recording/reproducing apparatus for implementing the present invention. Here, the beam emitted from a light source 11 such as a semiconductor laser is transmitted through a collimator lens 12.
The beam is collimated by , and divided into three beams by one diffraction grating. These beams are imaged by an objective lens 14 onto an optical card 21 as shown in FIG. 2, forming beam spots S+, S2, and S3, respectively. Here, the optical card 21 is moved in the direction of arrow a or b by a driving means (not shown), and the beam spot causes
Scanning is performed in the extending direction of the tracking track and the clock track.

The reflected light beams S+, S2, and S3 pass through the objective lens again and are reflected by the mirror 15.
A photodetector 17 placed in the focal plane by a condensing lens 16
, 18 and 19, respectively. These photodetectors are 1
They are arranged side by side in the Z direction shown in the figure. Further, the entire optical system is moved in the direction of arrow C by means (not shown) such as a stepping motor.

FIG. 4 is an enlarged view of the optical card recording surface for explaining the operation when recording data using the apparatus of FIG. 3. first,
When recording information on the recording track 231, spots S+*52+S3 are placed on the clock track 241 and the recording track 231, respectively.

The tracking track 251 is irradiated. These spots are scanned in the direction of the arrow d by moving the optical card 21 in the direction a as described above. The reflected light from Spora) S+ enters the aforementioned photodetector 17, and a clock signal is reproduced. In addition, the reflected light from the spora) 53 is detected by the photodetector 1
9, and a tracking signal is detected by a known method such as the so-called push-pull method. And spot S2
Data is recorded in the d direction.

Next, when recording data on the recording track 232, the optical system is moved in the direction C in FIG. 3 by moving the optical card in the direction shown in FIG. S2. 33 are tracking track 251, recording track 232, and clock track 2, respectively.
42. Then, the optical card is moved in the direction a and tracking signals are generated at spots Sl and S3, respectively.

Data is recorded in the d direction at spot S2 while detecting the clock signal.

When recording data on the recording track 233, no blank feed is performed and the data is recorded on the recording track 233 (spora) S+, S2.

S3 to clock track 242 and recording track 2, respectively.
33. ) The optical card 21 is sent in the b direction while irradiating the racking track 252, and data is recorded in the e direction.Similarly, the next recording track is in the e direction, and the next recording track is again in the d direction. Record the information, 2
Records data in a different arrangement for each column.

FIG. 5 shows the operation when the data recorded as described above is reproduced using the same device.

The spots S+, S2, and S3 are irradiated onto the recording track 231, the racking track 251, and the recording track 232, respectively, and scan the optical card in the direction of arrow d by moving the optical card in the direction a.

Then, while detecting the tracking signal with the photodetector 18 corresponding to the spot 31 and S2, the photodetector 17 and 19 corresponding to the spot 31 and S3 detect the recording track 23+,
6th order to simultaneously reproduce data recorded in 232 in two rows, Spora) S+, S2.

Record S3 on track 233. ) racking truck 25
2. The recording track 234 is irradiated, the optical card is moved in the b direction, and each spot is scanned in the e direction.

Then, while the photodetector 18 performs tracking detection, the photodetector 17.19 detects the recording track 233. 23
The data recorded in 4 will be played back at the same time. By repeating such operations, data recorded in a plurality of columns can be read out two columns at a time at high speed without skipping.

The present invention is not limited to the above-mentioned embodiments, and can be applied to various applications. The data may be recorded by inverting the data on either side, and N may be set to any number as long as it is a natural number of 2 or more.

〔Effect of the invention〕

As explained above, when recording data in a plurality of columns on an optical card, the present invention changes the arrangement direction of the data every N columns (N is a natural number of 2 or more), and the data is recorded in this way. By simultaneously reproducing N columns of data, it is possible to reduce the time required for reproducing data.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view of an optical card for explaining the data recording and reproducing method of the present invention, FIG. 2 is a schematic plan view showing an example of an optical card to which the present invention can be applied, and FIG. 3 is a schematic plan view for implementing the present invention. FIG. 4 is an enlarged view of the recording surface of an optical card showing data recording using the device shown in FIG. 3; FIG. 5 is a perspective view showing a part of the configuration of the data recording/reproducing device; FIG. FIGS. 6 and 7 are schematic plan views of a conventional optical card and a data recording method thereof, respectively. 1--Some cards 2-m-Data recording area 31 e 32 * 3 Nt S N◆1.3N◆
2*---+32N1328◆1-11 Recording track Figure 6 Figure 7

Claims (1)

[Claims] (1) When N is a natural number of 2 or more, data is recorded in a plurality of columns on a card-shaped optical recording medium with the data arrangement direction being different every N columns, and the data recorded in this way is A data recording and reproducing method that simultaneously reproduces N rows of data.