JPS63217576A - Recording system for optical recording medium - Google Patents

Abstract

PURPOSE:To effectively utilize a medium surface by centering a card-like medium in a different position from its center, a rotating the medium around it and recording optically a bit of information in a concentric circular or spiral way. CONSTITUTION:The rotating center (through hole 3) of the optical recording card is disposed to a different position from the center of the card 1, and the card 1 is rotated around the hole 3 to be recorded in the concentric circular or spiral way in order to bring its recording area 2 nearer one side of the card 1. By this constitution, non-recording area is not broken up into parts toward both sides of a card, thus utilizing the surface of a card so effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a recording method for an optical recording medium that optically records data that is optically read on, for example, a card-like medium.

(Prior Art) In recent years, optical recording cards have been developed as memory cards that carry recorded data (!), on which data is optically recorded or reproduced. As shown in FIG. 1, there are a plurality of stripes 12 on which data is recorded along the longitudinal direction on the surface of the card 11.
A data recording area 13 consisting of... and a non-recording area 1 where visible information such as the card name and type is printed.
4 is provided. However, this optical recording card 11
In this case, when recording or reproducing data on the stripes 12, it is necessary to move the card 11 back and forth in a two-dimensional manner, resulting in a slow data recording or reproducing speed. However, the disadvantage was that it was inefficient.

Therefore, in order to improve the efficiency of recording or reproduction, for example, as shown in FIG.
A device has been devised in which data is recorded or reproduced while rotating the card 16 with the card 16 as the center of rotation. However, in this optical recording card 16,
A recording area 17 is provided in which data is recorded concentrically or spirally around the center 18 of the card 16.

That is, the optical recording card 16 is rectangular.

Therefore, when data is recorded while rotating the card 16 with the center 18 of the optical recording card 16 as the center of rotation, non-recording areas 19a and 19b are scattered at both ends of the card 16, making the surface of the card 16 effective. The disadvantage was that it could not be used for

(Problems to be Solved by the Invention) In the case of an optical recording card in which data is recorded along the longitudinal direction of the card, this invention requires two-dimensional movement of linearly reciprocating the card. Therefore, the speed of data recording or playback is slow, and the efficiency of recording or playback is poor.In addition, in the case of optical recording cards, where data is recorded while rotating the card itself with the center of the card as the center of rotation, the card This eliminates the drawback that the surface of the card cannot be used effectively due to the non-recording areas being distributed at both ends of the card, making it possible to record or reproduce data efficiently, and to utilize the surface of the medium effectively. The purpose is to provide a recording method for optical recording media that can be used.

[Structure of the Invention] (Means for Solving the Problems) In the recording method of an optical recording medium of the present invention, the medium is rotated with a rotation center at a position different from the center of the card-shaped medium. However, data is recorded optically in a concentric or spiral manner.

(Function) The present invention records data optically in a concentric or spiral manner while rotating the medium, with the center of rotation at a position different from the center of the card-like medium, thereby recording data on one side of the medium. The recording area is concentrated in one area, and the non-recording area is concentrated in one area.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows an optical recording card (optical recording medium) 1 to which the present invention is applied. That is, the optical recording card 1 has a lower layer (underlayer) with a reflectance of 6% provided on the surface of a rectangular substrate made of polyester, for example, and a reflectance of 40% provided on the surface of this lower layer.
It is composed of % outer skin (craft). Note that a transparent plastic capsule for protection is provided on the surface of the outer skin. The basic material of both the outer skin and the lower layer is organic colloid (gelatin), and the outer skin is mixed with silver particles to increase reflectance.

The optical recording card 1 has a through hole 3 formed at a position different from the center 4 of the card 1, and around the through hole 3 is a data recording area where data is recorded concentrically or spirally. 2 is provided. The data recording area 2 is composed of a plurality of tracks and sectors that divide each track into a plurality of sectors, and the outermost track is provided so as to be substantially in contact with three sides of the card 1.

That is, the through hole 3 is arranged at a position different from the center 4 of the optical recording card 1, and the data recording area 2 is formed around the through hole 3. In other words, the data recording area 2 is located on one side of the card 1. It is said that the configuration is arranged in

Therefore, the optical recording card 1 has a data recording area 2.
In addition, the non-recording area 5 as an area other than this can be concentrated in one place.

However, before &! Card 1 with the tribute passage as the center of rotation
While rotating, a bit corresponding to the data is formed on the outer skin of the data recording area 2 by, for example, laser beam irradiation, and the lower layer is exposed through this bit. Therefore, in the optical recording card 1, digital data is recorded or reproduced by utilizing changes in the reflectance of light depending on the presence or absence of bits caused by laser light irradiation.

FIG. 2 is an optical recording card recording/reproducing device according to the present invention!
20 is schematically shown. That is, the optical recording card (optical recording medium) 1 is driven to rotate at a constant speed around the through hole 3 by the motor 21. The motor 21 is composed of a spindle motor that rotates at a constant rotation speed.

An optical head 30 for recording or reproducing data is located below the optical recording card 1 in a data recording area 2.
It is provided so as to be movable in the radial direction (in the direction of the arrow shown). This optical head 30 includes, for example, a semiconductor laser oscillator 31, a lens system 32, a beam splinter 33, a λ/4
It is composed of a plate 34, an objective lens 35, a condensing lens 36, and a light receiver 37.

The output of the optical head 30, that is, the light receiver 37, is converted into 21a by the binarization circuit 24, demodulated by the demodulation circuit 25, and supplied to the control circuit 26, whereby the reproduced data is output to an external device (not shown). be done. The control circuit 26
The entire device 20 is controlled in response to a signal from an external device.
Under the control of this control circuit 26, recording information from an external device is modulated by a modulation circuit 27 and supplied to a laser driver 28, and a semiconductor laser oscillator 31 in an optical head 30 is activated in accordance with this modulation signal. Data is recorded by being driven.

Next, a recording method of an optical recording card with such a configuration will be explained. For example, now, the optical recording card 1 is taken into the recording/reproducing device W2O, and is rotated by the motor 21 at a constant speed with the through hole 3 as the center of rotation. In this state, recorded information is transmitted from an external device (not shown).
Suppose that the signal is supplied to the l10 circuit 26. Then, the recording information from the control circuit 26 is modulated by the modulation circuit 27 and supplied to the laser driver 28. This causes the laser driver 28 to connect to the semiconductor laser oscillator 31 in the optical head 30.
By driving the semiconductor laser oscillator 31, a recording laser beam is outputted from the semiconductor laser oscillator 31 in accordance with the supplied modulation signal. Then, the laser beam is irradiated onto the optical recording card 1 via the lens system 32, beam splitter 33, λ/4 plate 34, and objective lens 35. As a result, bits corresponding to the laser beam are formed on the data recording area 2, thereby recording data. Therefore, in the optical recording card 1, a plurality of bits corresponding to recording information are formed in a concentric or spiral shape around the through hole 3.

It is also assumed that a reproduction signal is supplied to the control circuit 26 from an external device (not shown). Then, the control circuit 26 drives the laser driver 28, so that the semiconductor laser oscillator 31 outputs laser light for reproduction. This laser beam for reproduction is irradiated onto the data recording area 2 of the optical recording card 1 by the objective lens 35. The reflected light from the data recording area 2 by this laser beam for reproduction is transmitted to the objective lens 35, the λ/4 plate 34, and the beam splitter 3.
3 and a condensing lens 36 to a light receiver 37,
Here, the charge is converted into an electrical signal.

This electrical signal, that is, the read signal, is binarized by a binarization circuit 24, demodulated by a demodulation circuit 25, and supplied to a control circuit 26. As a result, the reproduced data is ill 1
The signal is outputted by the 111 circuit 26 to an external device (not shown).

As described above, the center of rotation (through hole 3) of the optical recording card 1 is placed at a position different from the center 4 of the card 1, and data is recorded while rotating the card 1 itself with the through hole 3 as the center of rotation. In order to perform recording or reproduction, data is recorded concentrically or spirally with respect to the center of rotation.

That is, the center of rotation for rotating the card 1 itself is shifted from the center 4 of the optical recording card 1, and the data recording area 2 is moved to one side of the card 1 in the lateral direction to record data. It is. As a result, the data is recorded concentrically or spirally, so the recording or reproducing speed can be increased, and even if data is recorded concentrically or spirally, the non-recording area 5 is This makes it possible to provide them concentratedly on one side of the Therefore, data can be recorded or reproduced efficiently, and a sufficiently large space (non-recording area 5) for printing visible information such as the name and type of the card 1 can be secured. This allows the front surface of the card 1 to be used effectively.

In addition, the non-recording area 5 can be used not only to print visible information, but also to provide contacts for an IC card, for example, when the non-recording area 5 is used as both an optical recording card and an IC card. , is particularly effective.

Furthermore, the data recording area 2 is the largest circle that can be formed within the card 1, with the outermost track approximately touching the three sides of the card 1, with the center of rotation as an axis. therefore.

Compared to the conventional optical recording card 16 in which data is recorded using the center 18(4) of the card 16(1) as the center of rotation, there is no disadvantage such as a reduction in data recording capacity.

In the above embodiment, the optical recording card 1 is provided with the through hole 3, but the invention is not limited to this. For example, if the card 1 is held and rotated, the optical recording card 1 is not necessarily There is no need to form the through hole 3.

It goes without saying that various other modifications can be made without departing from the gist of the invention.

[Effects of the Invention] As described in detail above, the present invention provides a recording method for an optical recording medium that can efficiently record or reproduce data and that can effectively utilize the surface of the medium. Can be provided.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a recording example of an optical recording card to which an optical recording medium recording method according to an embodiment of the present invention is applied, and FIG. 2 is a schematic configuration of a recording/reproducing apparatus according to the present invention. FIG. 3 and FIG. 4 are plan views showing recording examples of conventional optical recording cards, respectively. 1... Optical recording card (optical recording medium), 2... Data recording area, 3... Through hole (center of rotation), 4...
Center of card, 5... non-recording area, 20... recording/reproducing device, 21... motor, 30... optical head. Applicant's agent Patent attorney Takehiko Suzue Figure 1 vK2

Claims (2)

[Claims] (1) A recording method for an optical recording medium, characterized in that data is optically recorded concentrically or spirally while rotating the medium, with the center of rotation set at a position different from the center of the card-shaped medium. (2) A recording method for an optical recording medium according to claim 1, wherein the center of rotation is located inside the medium.