JPH01138619A - Optical information recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain the recording and reproducing of the high density and the large capacity of an optical card by providing separately a common clock track able to be reproduced optically and magnetically and removing the clock track from an information recording surface. CONSTITUTION:An information recording part 2 and a tracking track 4 are formed alternately and at an equal interval on the information recording surface of an optical card 1. On the arbitrary position of the card 1, a single or plural common optically detectable clock tracks 7 or magnetically detectable clock tracks 8 are provided. For the recording part 2, while a tracking signal is reproduced from the track 4 with an optical head, the recording and reproducing of the information are executed and for the clock signal, an optical head for reproducing a separate clock signal is always reproduced from tracks 7 and 8. Thus, by providing separately the clock track, the high density and the large capacity of the optical card can be executed.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a device for optically recording (writing) or reproducing (reading) information, and in particular to a card-shaped device provided with a track for obtaining a clock signal. The present invention relates to a device used for an optical information recording medium.

[Prior Art] Conventionally, a write-once type optical card is known as a card-shaped optical information recording medium, and in this write-once type optical card (hereinafter referred to as an optical card), information is modulated according to recorded information. The resulting light beam is focused by a lens into a minute light spot, and this minute light spot is irradiated onto the information recording section of an optical card, which is then scanned and recorded as an optically detectable pit row (information track).

This information track is for convenience in reproducing the information.
Since they need to be arranged in a straight line and at regular intervals, the optical card is provided with a guide track for this purpose, and the guide track is used as a reference when recording and reproducing information. It is necessary to control or track the minute light spot (hereinafter referred to as the light spot) in the direction perpendicular to the scanning direction so that the light spot matches the information track correctly, and also to keep the scanning speed of the light spot constant. , it was also necessary to obtain a clock signal.

For this reason, for example, as a conventional card, an optical card is known in which a guide track for obtaining a tracking signal and a clock signal is formed on the optical card in advance, as shown in FIG. 4.

Here, FIG. 4(A) shows a schematic plan view of this conventional optical card, and FIG. 4(B) shows an enlarged view of the information recording surface of the optical card.

In FIG. 4A, an information recording section 2 is sandwiched between an optical card 1 and a clock track 3 is formed on one side, and a tracking track 4 is formed on the other side. In order to record information on the optical card l, three light beams from the optical head are focused to form three light spots 5a, 5b and 5C on the optical card as shown in FIG. 4(B). irradiate. These three light spots 5a, 5b and 5C are
The clock signal is reproduced from the light spot 5a that is scanned in the direction of the arrow S by the relative movement of the optical card and the optical head and is irradiated onto the clock track 3, and the information recording section 2 is irradiated with the light spot 5b. and information pit 6
Record.

Further, the tracking track 4 is irradiated with a light spot 5c, and the reflected light is guided to the detection means in the optical head.
The tracking signal is reproduced by a known method such as the push-pull method. Based on this tracking signal, the three optical spots 5a, 5b, and 5c are tracked together, and each optical spot is controlled so as to trace accurately on its respective track.

In the case of information reproduction, except for reproducing the information signal from the optical spot 5b, reproduction of the clock signal and reproduction of the tracking signal are performed in the same manner as in the case of recording.

[Problems with the prior art] The above-mentioned conventional method in which a clock track 3 and a tracking track 4 are formed in addition to an information track on an optical card is excellent in terms of operational reliability, but it is difficult to record large amounts of data. The problem was that it diminished the optical card's ability to do so. In other words, since these clock tracks and tracking tracks are provided for each information track, there is a drawback that the recording/reproducing portion of the information track is limited in terms of capacity.

[Object of the Invention] An object of the present invention is to provide an optical information recording/reproducing device which solves the above-mentioned conventional problems, enables an increase in the recording capacity on a card, and has excellent operational reliability. shall be.

[Summary of the Invention] The present invention provides a method for recording or recording information on a card-shaped optical information recording medium in which a common track that can be reproduced by an optical or magnetic method is provided separately, and a clock track is removed from the information recording surface. The present invention provides an optical information recording and reproducing device having means for reproducing a clock signal from one or more common lock tracks provided on the medium when recording or reproducing information. .

[Example] FIG. 1 is a schematic plan view of an optical card used in the apparatus of the present invention. On the information recording surface of the optical card l, information recording sections 2 and tracking tracks 4 are formed alternately at equal intervals, and a common optically detectable lock track 7 is provided at any position of the optical card l. There are multiple locations.

Alternatively, one or more magnetically detectable locking tracks 8 are provided. Here, one or more optically detectable lock tracks 7 and magnetically detectable tracks may be provided.

A tracking track 4 is recorded in the information recording section 2 using an optical head.
Information is recorded or reproduced while reproducing the tracking signal from the clock track 7 or 8, but the clock signal is always transmitted from the clock track 7 or 8 using an optical head or magnetic head dedicated to reproducing the clock signal, which is separate from the optical head for recording and reproducing information. Play using.

Since the clock track 7 only needs to be able to optically reproduce the clock signal, the shape of the bit should be the same as the clock track 3 in FIG. 4, as shown in FIG. 2(A), and the light spot 5d should be aligned with the arrow S. Alternatively, as shown in FIG. 2(B), the bit shape may be a rectangle with an extremely large aspect ratio, for example, similar to a bar code, and the light spot 5d may be scanned in the direction of the arrow S. You may.

Alternatively, as shown in FIG. 2(C), a slit 9 may be provided close to the clock track 7, and light may be applied to the slit portion to irradiate the clock track 7 with the light passing through the slit 9.

Furthermore, as shown in FIG. 2(D), the clock track 7 is illuminated by the light source 10, the lens 11 generates an image 7° of the clock track 7, and the light passing through the slit 9 of this image 7° is received. A method of making the light incident on the element 12 may also be used.

In the case of FIGS. 2A, 2B, and 2C, the clock track 7 is irradiated with the light passing through the light spot 5d or the slit 9, but the reflected light from the clock track 7 is guided to the light receiving element. Needless to say, it is structured as follows. In addition, especially in the case of FIG. 2(B) or (C), the light spot 5d or the arrow S of the light passing through the slit 9
An advantage of scanning in this direction is that control in a direction perpendicular to the scanning direction, that is, tracking, is not required. Furthermore, in the case of FIG. 2(D), depending on the shape of the pit or slit 9, tracking can be made unnecessary.

FIG. 3 shows an example of the configuration of an optical head dedicated to clock signal reproduction. FIG. 3(A) is applied to FIGS. 2(A) and 2(B), and the light emitted from the light source 10 is made incident on the lens 14 through the half mirror 13, and is focused by the lens 14 to clock the optical card l. A light spot 5d is irradiated onto the track 7. The reflected light from the clock track 7 travels in the same direction as the incident light, is reflected by the half mirror 13, and is sent to the light receiving cable 1.
2, where it is converted into an electrical signal.

FIG. 3(B) is applied to FIG. 2(C), in which the light emitted from the cooling device 10 is applied to the slit plate 15, which absorbs light except for the slit portion, and The clock track 7 of the first card 1 is irradiated with the passing light. The reflected light from the clock track 7 is received by the light receiving element 12,
Here it is converted into an electrical signal.

In addition, when detecting and reproducing the clock signal magnetically,
Clock track 8 on which a clock signal is magnetically recorded
It is sufficient to output the information using a magnetic head.

To record and reproduce information on an optical card, the optical card is usually mounted on a shuttle and the optical spot is scanned on the optical card by reciprocating the shuttle, so a clock track is not necessarily provided on the optical card. Instead, it may be placed in a part of the shuttle.

When regenerating a clock signal, the lower the regenerated clock frequency, the easier it is to handle. When the frequency is set high, the pits of the clock track become minute and the optical head for reproducing the clock signal becomes expensive. This is almost the same in the case of magnetic reproduction. Therefore, when a high-frequency clock signal is required, it is better to use means such as multiplying the reproduced clock signal to keep the reproduced clock frequency low.

In the detailed description of the present invention, the case where the clock signal is reproduced optically or magnetically has been described, but the clock track may be provided by other mechanical methods such as unevenness.

In addition, in optical reproduction, we have explained the case where a clock signal is obtained by receiving reflected light from a clock track.
A clock track through which light can pass may be provided, and the clock signal may be obtained by receiving the transmitted light.

Furthermore, although the present invention has been described using a write-once optical card as an example, the present invention can also be implemented for a read-only type or an erasing/re-recording type optical card.

[Effects of the Invention] As described above, the optical information recording and reproducing device of the present invention separately provides a common clock track that can be reproduced by an optical or magnetic method, and the clock track is provided on the information recording surface. Since it is a device that records or reproduces information on an optical card that is formed without the need for a
It has the effect of being usable for high-density, large-capacity recording and playback.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of an optical card used in the device of the present invention, and FIGS. 2(A) and (B) show pits and clock signals forming a clock track of the optical card used in the device of the present invention. A diagram showing the light spot for reproduction, Figure 2 (C
) is a diagram showing that the clock track is similarly irradiated with light for pit and clock signal reproduction through the slit, Figure 2 (D) is a diagram showing how to obtain the clock signal from the image of the clock track through the slit, and Figure 3 Figures (A) and (B) are diagrams showing a configuration example of an optical head dedicated to clock signal reproduction of a device according to the present invention, and Figures 4 (A) and (B)
1 is a front view of a conventional optical card and a partially enlarged view of an information recording surface of the optical card. l... Optical card, 2... Information recording section, 3... Clock track, 4... Tracking track, 6...
・Information pit. 7... Clock track (optical recording), 8... Clock track (magnetic recording), 9... Slit, 10
···light source. It, 14... Lens, 12... Light receiving element, 15.
...Slit plate.

Claims (1)

Scope of Claims: (1) In an apparatus for recording or reproducing information on a card-shaped optical information recording medium, optical or magnetic detection means detects one or more common clock tracks on the recording medium. 1. An optical information recording and reproducing device characterized in that it is configured to scan and reproduce a clock signal. (2) The optical information recording medium according to claim 1, wherein the pit shape of the clock track is a large rectangle in a direction perpendicular to the track. (3) The clock track detecting means detects by reflected light irradiated by light passing through a slit provided above the clock track on the upper surface of the optical information recording medium. The optical information recording/reproducing device described above. (4) The optical system according to claim 1, wherein the clock track detection means illuminates the clock track and causes an image obtained through a lens to enter a light receiving element through a slit. Information recording and reproducing device. (5) The optical information recording medium according to claim 1, wherein the clock track is an optically detectable track and a magnetically detectable track provided on the recording medium.