JPH097287A - Optical disc reproducing apparatus and optical disc discriminating method - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a reproducing apparatus in which reproduction of an optical disk is performed without the user being aware of which method the optical disk is. A drive unit 12 for rotationally driving an optical disc 11 on which image data is digitized and compressed and recorded, and an optical pickup 13 for reading a signal, which irradiates the optical disc with light and detects return light. A signal processing circuit 14 that processes a detection signal from the optical pickup to generate image data, and is arranged to face the surface of the optical disc opposite to the optical pickup in the DVD reproducing device 10. A photocoupler 15 including a light emitting portion 15a for irradiating the optical disc with light, and a light receiving portion 15b for receiving reflected light of the optical disc from the light emitting portion,
And a control unit 16 for discriminating the optical disc based on the detection signal of the photocoupler.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention irradiates light on an optical disc on which not only audio information but also image information is digitized and compressed for recording, and detects return light to detect a recording signal. The present invention relates to an optical disk reproducing device for reproducing.

[0002]

2. Description of the Related Art Recently, not only audio information but also digitized image information is compressed and recorded on a track of an optical disc having the same size as a CD (compact disc) having a diameter of 12 cm. Such an optical disc is particularly called a digital video disc (hereinafter referred to as a DVD). A disc reproducing apparatus for reproducing such a DVD irradiates the surface of the DVD which is rotationally driven with light such as laser light from an optical pickup. Then, the light receiving element of the optical pickup detects the return light from the surface of the DVD and reads the signal recorded on the DVD to generate the reproduction signal of the image data.

[0003]

However, the above-mentioned DVD is currently mixed with two or more standards having different characteristics. For example, since a disc having only one surface configured as a signal recording surface and a disc having both surfaces configured as a signal recording surface are mixed, a reproducing apparatus that supports only one system standard may use a DVD of another system. However, there is a problem in that the signal cannot be correctly detected from the return light from the DVD when reproducing.

For this reason, the user can
There is a problem in that it is necessary to always play back by using a disc playback device dedicated to each system while being aware of which system.

In view of the above points, the present invention provides an optical disk reproducing apparatus in which recording and / or reproduction of an optical disk can be performed without the user being aware of which method of the optical disk. Has an aim.

[0006]

SUMMARY OF THE INVENTION According to the present invention, the above-mentioned object is to provide a drive unit for rotationally driving an optical disc on which image data is digitized, compressed and recorded, and an optical disc rotated by the drive unit. An optical pickup for reading signals, which irradiates light and detects return light, a signal processing circuit which processes detection signals from the optical pickup to generate image data, and a surface of the optical disk opposite to the optical pickup. On the basis of a detection signal of the photocoupler and a photocoupler that is disposed to face the optical disc and that emits light to the optical disc, and a light receiving unit that receives the reflected light of the optical disc from the light emission unit. And an optical disc reproducing apparatus including a control unit for discriminating an optical disc.

Further, according to the present invention, the above object is recorded on an optical disk by irradiating the optical disk on which image data is digitized, compressed and recorded with light and detecting return light. In the optical disc discriminating method of the optical disc reproducing device for reproducing the image data, the surface of the optical disc opposite to the optical pickup is
This is achieved by an optical disc discriminating method in which light is emitted, the reflected light is detected, and the optical disc system is discriminated by the reflected light.

[0008]

According to the above structure, the photocoupler detects the reflected light from the surface of the optical disk opposite to the optical pickup. Therefore, in the case of a double-sided recording type optical disk,
Since this surface is the signal recording surface, the light from the photocoupler is totally reflected, but in the case of a single-sided recording type optical disk, this surface is not the signal recording surface, so it is not completely printed by printing a label or the like. Not reflected. Therefore, based on the output signal of the photocoupler, the control means determines which type of optical disc the optical disc belongs to.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to FIGS. In addition, since the Examples described below are preferred specific examples of the present invention, various technically preferable limitations are given. However, the scope of the present invention particularly limits the present invention in the following description. The embodiment is not limited to these embodiments unless otherwise stated.

FIG. 1 shows a digital video disk (DVD) reproducing apparatus as an embodiment of the optical disk reproducing apparatus according to the present invention. In FIG. 1, a DVD reproducing device 1
Reference numeral 0 denotes a spindle motor 12 that rotationally drives a DVD (digital video disk) 11, and a DVD that is rotationally driven.
An optical pickup 13 for reading a signal, which irradiates the signal recording surface 11 with light and detects return light,
A signal processing circuit 14 for processing a detection signal from the optical pickup 13 to generate image data, and a photocoupler for irradiating the surface of the DVD 11 opposite to the optical pickup 13 with light and detecting reflected light. 15, a system controller 16 to which a detection signal from the photocoupler 15 is input, and a driver 17 that drives the spindle motor 12 based on a control signal from the system controller 16.

The spindle motor 12 has a turntable 12a for holding the DVD 11 at the tip of its drive shaft.
The DVD 11 mounted on the turntable 12a is rotationally driven at a predetermined speed.

The optical pickup 13 includes a light source for irradiating a light beam such as a laser beam and a light beam from the light source for DVD.
An optical system including an objective lens for forming an image on the signal recording surface of the DVD 11 and a photodetector for receiving the return light from the signal recording surface of the DVD 11 and a light beam DVD
The spot of 11 on the signal recording surface is configured to move in the radial direction within the range of the signal recording surface of the DVD 11.

The signal processing circuit 14 includes an optical pickup 1
3 is input, and based on this detection signal, the image data recorded on the DVD 11 is generated and output to an external device such as a display (not shown). In this case, the signal processing circuit 14 is switching-controlled based on a control signal from the system controller 16 so as to reproduce the DVD 11 of the selected method among the DVDs of the plurality of methods. .

The photocoupler 15 emits light to the surface of the DVD 11 opposite to the optical pickup 13 and the light emitted from the light emitting portion 15a to the DVD 11 and reflected by the DVD 11 is received. Light receiving part 1
5b. A photoelectric conversion element such as a photodiode is preferably used for each of the light emitting unit 15a and the light receiving unit 15b.

The system controller 16 drives and controls the light emitting portion 15a of the photocoupler 15 and receives the detection signal from the light receiving portion 15b. The system controller 16 determines the system of the DVD 11 based on the detection signal. A control signal corresponding to the determined method is sent to the signal processing circuit 13.

Here, the DVD 11 includes, for example, two types, that is, a single-sided recording type DVD shown in FIG. 2 and a double-sided recording type DVD shown in FIG. In FIG. 2, single-sided recording type D
In the VD 20, for example, a pit representing information to be recorded is formed by a stamper on one surface of a substrate 21 made of polycarbonate, and a first reflective film 22 made of a semitransparent dielectric film is formed thereon by sputtering. ing.
In addition, the ultraviolet curable resin 23 is poured on the ultraviolet curable resin 23, and the ultraviolet ray is irradiated while pressing the stamper against the surface of the ultraviolet curable resin 23 to cure the ultraviolet curable resin 23. The reflective film 24 is formed, and finally the protective film 25 made of an ultraviolet curable resin is formed. And
On the surface (lower surface in the figure) of the protective film 25, a label 26 indicating the recorded contents is printed.

On the other hand, in the double-sided recording type DVD 30, as shown in FIG. 3, pits representing information to be recorded are formed by stampers on one surface of the two substrates 31, 32, respectively, and aluminum is formed by sputtering from above. Reflective films 33 and 34 of the same type are formed. Further, protective films 35 and 36 made of an ultraviolet curable resin are formed thereon, and finally, the substrates 31 and 32 are bonded to each other with an adhesive layer 37 so that the protective films 35 and 36 face each other.

Next, using the reproducing apparatus of this embodiment, the DV
When the D11 is reproduced, the system controller 16 first determines the photo coupler 15 for discriminating the DVD 11.
The light emitting portion 15a of the above is emitted and the driver 17 is controlled to rotate the spindle motor 12. In this case, the light emission time of the light emitting unit 15a is determined by the spindle motor 12
Thus, the DVD 11 is set to be long enough so that the DVD 11 rotates once or more. As a result, the light from the light emitting portion 15a of the photocoupler 15 is applied to the DVD 11 and reflected when it is a signal recording surface. Then, when the reflected light enters the light receiving portion 15b of the photocoupler 15, the light receiving portion 15b
Outputs a detection signal to the system controller 16.

At this time, when the DVD 11 is the double-sided recording type DVD 30 shown in FIG. 3, the light emitted from the light emitting portion 15a of the photocoupler 15 is the reflection film 33 of the DVD 30.
Or, it is totally reflected by 34. Therefore, the detection signal from the light receiving portion 15b of the photocoupler 15 is reflected light enters while the light emitting portion 15a is emitting light, as indicated by a symbol A in FIG. , Will output a detection signal.

On the other hand, when the DVD 11 is the single-sided recording type DVD 20 shown in FIG.
Since the light emitted from the light emitting section 15a of the laser hits the label 26 of the DVD 20, the light is diffusely reflected at the printed portion of the label 26. Therefore, the light receiving portion 15 of the photocoupler 15
The detection signal from b is, as shown by the symbol B in FIG. 4, only while the light emitting section 15a is emitting light and when the portion irradiated with the light from the light emitting section 15a is not printed. Since reflected light is incident on the label 26, no detection signal is output at the printed portion of the label 26.

Thus, the system controller 16 is
Based on the detection signal from the light receiving unit 15b of the photocoupler 15, when the detection signal is output for a predetermined level, for example, 80% or more of the light emission time of the light emitting unit 15a of the photocoupler 15, It is determined that the DVD is a double-sided reflection type DVD 30, and in other cases, a single-sided recording type DVD
The control signal corresponding to the determined system is output to the signal processing circuit 14.

Then, the signal processing circuit 14 is switched according to the system of the DVD 11 based on the control signal.
After that, the optical pickup 13 accesses the area of the signal recording surface of the DVD 11 to read the signal recorded on the signal recording surface of the DVD 11. Thus, the DVD
The reproducing apparatus 10 correctly reproduces the DVD 11 regardless of the method of the DVD 11 at that time.

In the above-described embodiment, the DVD reproducing apparatus 10 switches the operation of the signal processing circuit 14 based on the determination result of the system of the DVD 11 to change the D
The VD 11 can be properly reproduced regardless of which method is used, but the present invention is not limited to this, and is configured so as to correspond to, for example, only one type of DVD, and is a DVD of another type. If it is determined that it is determined, a display to that effect may be displayed, or a warning sound or a warning display may be used to notify that effect. Further, in the case of a DVD of another type, the malfunction of the reproducing device may be prevented by ejecting it from the reproducing device. Further, in the above-mentioned embodiment, the reproducing apparatus for the optical disc is explained, but the same method as the present invention can be applied to the optical disc apparatus for recording and reproducing as well as reproducing. Therefore, it goes without saying that the present invention includes an optical disc device for performing such recording and reproduction.

[0024]

As described above, according to the present invention, there is provided an optical disc reproducing apparatus in which recording and / or reproducing of an optical disc is performed without the user being aware of which type of optical disc. Can be provided.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a first embodiment of an optical disk reproducing device according to the present invention.

FIG. 2 is an enlarged cross-sectional view showing a configuration example of a single-sided recording type digital video disc.

FIG. 3 is an enlarged cross-sectional view showing a configuration example of a double-sided recording type digital video disc.

4 is a graph showing a detection signal regarding an optical disc of each method of the photocoupler of the optical disc reproducing apparatus of FIG.

[Explanation of symbols]

10 Optical Disc (Digital Video Disc) Playback Device 11 Digital Video Disc 12 Spindle Motor 13 Optical Pickup 14 Signal Processing Circuit 15 Photocoupler 15a Light Emitting Section 15b Light Receiving Section 16 System Controller 17 Driver 20 Single-Sided Recording DVD 21 Substrate 22 First Reflective Film 23 UV curable resin 24 Second reflective film 25 Protective film 26 Label 30 Double-sided recording type DVD 31, 32 Substrate 33, 34 Reflective film 35, 36 Protective film 37 Adhesive layer

Claims (6)

[Claims] 1. A signal reading unit for rotatively driving an optical disc on which image data is digitized and compressed and recorded, and irradiating light to the optical disc rotated by the driving unit to detect return light. Optical pickup, a signal processing circuit that processes a detection signal from the optical pickup to generate image data, and is disposed so as to face the surface of the optical disc opposite to the optical pickup, and irradiates the optical disc with light. A photocoupler including a light emitting portion and a light receiving portion for receiving the reflected light of the optical disc from the light emitting portion, and a control means for discriminating the optical disc based on a detection signal of the photocoupler. Optical disk reproducing device. 2. The optical disk reproducing apparatus according to claim 1, wherein the detection by the photo coupler is performed while the optical disk is rotating. 3. The optical disk reproducing apparatus according to claim 2, wherein the detection by the photocoupler is performed while the optical disk rotates for one rotation or more. 4. The control means controls the signal processing circuit so that the digital disc of each system is correctly reproduced based on the determination result of the control means. An optical disk reproducing apparatus described in 1. 5. The optical disc according to claim 1, wherein, in the case of an optical disc of a specific method, the control unit ejects the optical disc from the device based on the determination result of the control unit. Playback device. 6. An optical disk reproducing apparatus for reproducing image data recorded on an optical disk by irradiating the optical disk on which image data is digitized and compressed and recorded and detecting return light. In the method for discriminating an optical disc, the disc on the side opposite to the optical pickup of the optical disc is irradiated with light to detect the reflected light, and the disc type is discriminated by the reflected light. Method.