JP2001184641A - Optical reproducing device, and manufacturing method of disklike recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a disklike recording medium, in which high-density recording is made. SOLUTION: When the disklike recording medium having plural colors using three primary colors, i.e., red R, green G and blue B, in a dot form, is manufactured, to represent an information signal, plural color dots using the three primary colors of red R, green G and blue B are formed on an original plate, the original plate is reduced by photographing, and then developed. Thus, the plural colors are formed in a dot shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical reproducing apparatus for a disk-shaped recording medium in which information signals are recorded in a plurality of colors using three primary colors of light, and a method for manufacturing the disk-shaped recording medium.

[0002]

2. Description of the Related Art An optical recording / reproducing apparatus for recording / reproducing an information signal on / from an optical disk capable of recording / reproducing and an optical reproducing apparatus for reproducing an information signal on / from an optical disk dedicated for reproduction are widely used. It is also known that an optical disc has a reflective film formed on a disk-shaped substrate as a read-only one. In this optical disc, an information signal is formed on a substrate as an uneven pattern such as pits.

An optical reproducing apparatus can reproduce an information signal recorded on an optical disk by irradiating a predetermined laser beam to the optical disk exclusively for reproduction and detecting the light reflected by the reflection film. Specifically, since the position of the reflective film varies depending on the concavo-convex pattern formed on the substrate, the amount of reflected light or the like changes in accordance with the concavo-convex pattern. And reproduce the information signal.

That is, in a conventional optical reproducing apparatus, a 2-bit signal can be reproduced corresponding to a convex portion or a concave portion in a concave / convex pattern formed on a substrate.

[0005]

However, in recent years,
A disc-shaped recording medium is required to have a large capacity of an information signal with an increase in the amount of information to be handled, and it cannot be said that the above-described optical disc has achieved a sufficient amount of information.

Accordingly, the present invention has been devised in view of the above-described conventional circumstances, and is capable of reproducing information on a disc-shaped recording medium on which an information signal is recorded using three primary colors of light. It is an object of the present invention to provide a simple optical reproducing apparatus and a method of manufacturing a disk-shaped recording medium on which recording is performed at high density.

[0007]

An optical reproducing apparatus according to the present invention, which has achieved the above-mentioned objects, comprises a disk in which a plurality of colors using three primary colors of red R, green G and blue B are colored in a dot shape. An optical reproducing apparatus for reproducing an information signal from a disk-shaped recording medium, comprising: a white light emitting unit that emits white light; and white light from the white light emitting unit converging to a plurality of colors on the disk-shaped recording medium. Convergence means for irradiating
Separating means for separating transmitted light obtained by passing a plurality of colors of white light converged by the converging means on the disc-shaped recording medium into red light, green light and blue light, and separating by the separating means Detecting means for respectively detecting the obtained red light, green light and blue light, and the disc-shaped recording medium is obtained by photographing an original plate on which color dots using three primary colors of red R, green G and blue B are formed. It has a plurality of colors that are developed after being reduced by photographing.

In the optical reproducing apparatus according to the present invention configured as described above, a disc-shaped recording medium having a plurality of colors is developed by reducing the size of an original plate by photography and developing the original.
For this reason, according to this optical reproducing apparatus, a disk-shaped optical recording medium recorded at a high density is reproduced.

Further, the method of manufacturing a disk-shaped recording medium according to the present invention manufactures a disk-shaped recording medium in which a plurality of colors using three primary colors of red R, green G and blue B are formed in a dot shape. At this time, in order to represent an information signal, a plurality of color dots using three primary colors of red R, green G and blue B are formed on the original plate, the original plate is reduced by photographing, and then developed. The plurality of colors are formed in a dot shape.

In the method of manufacturing a disk-shaped recording medium according to the present invention having the above-described structure, a plurality of colors obtained by development are formed at a higher density than color dots formed on an original plate. Will be.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the optical reproducing apparatus according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows the configuration of the optical reproducing apparatus shown in this embodiment. The optical reproducing device is composed of red light R, green light G
And a white LED 1 that emits white light obtained by mixing three primary colors of blue light B, a lens 2 that converges the white light emitted from the white LED 1, and a white light that is applied to the disc-shaped recording medium 3 via the lens 2. A dichroic prism 4 on which transmitted light is incident, and a first sensor 5, a second sensor 6, and a third sensor on which the red light R, green light G, and blue light B split by the dichroic prism 4 are incident, respectively. 7
And That is, this optical reproducing apparatus includes a first sensor 5 on which red light R is incident, a second sensor 6 on which green light G is incident, and a third sensor 7 on which blue light B is incident.

As shown in FIG. 2, a disc-shaped recording medium 3 reproduced by the optical reproducing apparatus is formed on a disk-shaped substrate 3a by using three primary colors of red R, green G and blue B. The colored dots 8 are formed.
The dots 8 are formed concentrically or spirally on the substrate, and have a shape substantially equal to the spot shape of the white light described above. In the disc-shaped recording medium 3, the substrate 3 is formed using a light-transmissive film, for example.

When forming this disk-shaped recording medium, first, an original plate is prepared by forming color dots using three primary colors of red R, green G and blue B. This original plate is larger than the disk-shaped recording medium 3 finally manufactured, and eight color dots formed by combining three primary colors of red R, green G and blue B are formed. Specifically, the original plate includes a single color of red R, a single color of green G, a single color of blue B, yellow (red R + green G),
Eight colors including purple (red R + blue B), deep green (green G + blue B), black (red R + green G + blue B), and colorless (no color) are formed in a dot shape.

Next, the original plate is photographed, reduced in size, and developed on a film. This film is to be a disk-shaped recording medium 3 processed into a predetermined shape, and is formed by reducing the color dots formed on the original plate. Therefore, the dots 8 are formed on the disk-shaped recording medium 3 thus formed at a higher density than the original plate.

The optical reproducing apparatus configured as described above reproduces an information signal formed as dots 8 using three primary colors of red R, green G and blue B on a disk-shaped recording medium.

At the time of an information signal, first, the optical reproducing apparatus
The dots 8 are irradiated with white light emitted from the white LED 1. At this time, the white light is converged via the lens 2 and is irradiated with a predetermined spot diameter on the dot to be reproduced. In other words, on the disk-shaped recording medium,
Since the high-density and minute dots 8 are formed, it is preferable to irradiate white light corresponding to the dot shape.

The white light includes red light R, green light G
And blue light B, and only light of a predetermined wavelength is absorbed according to the color of the dot 8. Specifically, when the dot 8 irradiated with white light is a single color of red, the dot 8 absorbs light other than the red light R, that is, the green light G and the blue light B, and transmits almost only the red light R. Let it. Further, when the dots 8 to be irradiated with white light are purple, which is a mixture of red and blue, the dots 8 absorb light other than green G, that is, green G, and almost only red R and blue light B are emitted. Let through.

Next, the transmitted light, which is the white light applied to the dots 8 and transmitted through the dots 8, is incident on the dichroic prism 4. The dichroic prism 4 can split the transmitted light into red light R, green light G, and blue light B. In other words, the transmitted light that has passed through the dots 8 is split by the dichroic prism 4 into components of red light R, green light G, and blue light B.

Then, after the transmitted light is split into red light R, green light G and blue light B by the dichroic prism 4,
Red light R, green light G and blue light B separated
Are the first sensor 5, the second sensor 6, and the third sensor 5, respectively.
To the sensor 7. The first sensor 5, the second sensor 6, and the third sensor 7 generate an electromotive force when light enters, and are turned on.

Specifically, when the red dots 8 are irradiated with white light, as described above, the transmitted light consisting of only the red light R is incident on the dichroic prism 4 and only the red light R is spectrally separated. The light is incident on the first sensor 5. Accordingly, when the red dots 8 are irradiated with white light,
An electromotive force is generated only in the first sensor 5, only the first sensor 5 is turned on, and the second sensor 6 and the third sensor 7 are turned off.

When white light is applied to the violet dots 8 in which red and blue are mixed, as described above, the transmitted light including the red light R and the blue light B enters the dichroic prism 4, The red light R and the blue light B are split by the dichroic prism 4. Then, the red light R enters the first sensor 5, and the blue light B enters the third sensor 7.
Incident on. As a result, when the purple dot 8 is irradiated with white light, an electromotive force is generated in the first sensor 5 and the third sensor 7, and the first sensor 5 and the third sensor 7 are turned on. The second sensor 6 turns off.

The outputs from the first sensor 5, the second sensor 6, and the third sensor 7 are input to a microprocessor unit (MPU) (not shown) and calculated. Thereby, the optical reproducing apparatus can reproduce the information signal recorded as the dots 8 on the disk-shaped recording medium 3.

As described above, in the recording / reproducing system using the optical reproducing apparatus shown in FIG. 1 and the disk-shaped recording medium shown in FIG. 2, one dot 8 is colored using three primary colors. Outputs from the first sensor 5, the second sensor 6, and the third sensor 7 can be obtained according to the color of the dot 8. Therefore, in this recording / reproducing system, 3-bit information can be obtained from one dot 8, and the amount of information can be greatly increased as compared with the conventional optical disk system.

In particular, in this recording / reproducing system, the original plate on which a plurality of color dots are formed is reduced by photographing, and then developed to form dots 8 of the plurality of colors.
Is used, the disk-shaped recording medium is recorded with high density. Therefore, in this case, the amount of information handled by the recording / reproducing system can be further improved.

By the way, in the optical reproducing apparatus described above, the first
The outputs from the sensor 5, the second sensor 6, and the third sensor 7 are not limited to those determined by turning on or off the electromotive force generated by irradiation with light of each wavelength. That is. The outputs from the first sensor 5, the second sensor 6, and the third sensor 7 are used to determine whether the electromotive force generated by irradiation with light of each wavelength is on or off, and the time required for generation of the electromotive force ( (Reaction rate).

For example, when white light is applied to the dot 8 consisting of red single color, in principle, only red light R is transmitted light, but green light G and blue light B are slightly transmitted light. Will be included. For this reason, when the transmitted light that has passed through the dot 8 composed of a single red color enters the dichroic prism 4, the green light G and the blue light B are slightly dispersed in the dichroic prism 4. As a result, as shown in FIG. 3, an electromotive force also occurs in the second sensor 6 and the third sensor 7 that detect the green light G and the blue light B.

However, as shown in FIG. 3, in the second sensor 6 and the third sensor 7, the time until the electromotive force is generated is later than in the first sensor 5. Therefore, the optical reproducing device includes the first sensor 5,
By controlling the output from the second sensor 6 and the third sensor 7 based on the time until the electromotive force is generated, that is, the rising time of the electromotive force, the transmitted light of the dot 8 is erroneously recognized. Can be prevented.
In other words, by controlling the first sensor 5, the second sensor 6, and the third sensor 7 to be on when the electromotive force occurs within the predetermined time, erroneous recognition of the information signal is prevented. be able to.

[0029]

As described above in detail, according to the present invention, it is possible to form a disk-shaped recording medium on which high-density recording is performed. In addition, it is possible to reliably reproduce the disk-shaped recording medium recorded at a high density.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an optical reproducing apparatus according to the present invention.

FIG. 2 is a diagram showing a disk-shaped recording medium manufactured by the method of the present invention.

FIG. 3 is a characteristic diagram showing a relationship between electromotive force and time generated in a first sensor, a second sensor, and a third sensor when white light is irradiated on a dot composed of a single red color.

[Explanation of symbols]

 Reference Signs List 1 white LED 2 lens 3 disk-shaped recording medium 4 dichroic prism 5 first sensor 6 second sensor 7 third sensor

Claims (3)

[Claims] 1. Red R, green G and blue B
An optical reproducing apparatus for reproducing an information signal from a disk-shaped recording medium in which a plurality of colors using primary colors are colored in a dot shape, comprising: a white light emitting unit that emits white light; Converging means for converging and irradiating white light on a plurality of colors on the disc-shaped recording medium; and obtaining the white light converged by the converging means through a plurality of colors on the disc-shaped recording medium. Separating means for separating the transmitted light into red light, green light and blue light, and detecting means for respectively detecting the red light, green light and blue light separated by the separating means, wherein the disc-shaped recording medium comprises: Light reproduction characterized by having a plurality of colors obtained by reducing an original plate on which color dots using three primary colors of red R, green G and blue B are formed by photographing and developing the original. Location. 2. The detecting means detects whether or not red light, green light and blue light obtained by separating transmitted light are irradiated, and detects when red light, green light and blue light are irradiated. 2. The optical reproducing apparatus according to claim 1, wherein a generation time of the generated electromotive force is measured. 3. Red R, green G and blue B
When manufacturing a disc-shaped recording medium in which a plurality of colors using primary colors are formed in a dot shape, a plurality of color dots using three primary colors of red R, green G and blue B to represent an information signal. A method for manufacturing a disk-shaped recording medium, comprising: forming a plurality of colors in a dot shape by forming a plurality of colors on an original plate, reducing the original plate by photographing, and thereafter developing the original plate.