JPH097288A - Optical disk reproducing device and optical disk discriminating method - Google Patents

Abstract

PURPOSE: To effectively discriminate the type of an optical disk based on an identification code by reading out the identification code for discriminating the type of the optical disk provided in a signal unrecorded part by means of an optical identifying device. CONSTITUTION: When a digital video disk DVD 21 is reproduced, an optical pickup for identification 24 reads out a bar code provided in the unrecorded part 21b of the DVD 21. Thus, a bar code decoder 25 outputs a signal complied with the bar code based on the detected signal from the pickup 24, a system controller 26 discriminates the type of the DVD 21 and outputs a corresponding control signal to a signal processing circuit 23. The circuit 23 is changed over corresponding to the type of the DVD 21 based on the control signal. Thereafter, an optical pickup 22 makes access to the signal recorded part 21a of DVD 21 and reads out the recorded signal.

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 In recent years, not only voice information but also digitized image information is compressed to a C of 12 cm in diameter.
What has been recorded on a track of an optical disc having the same size as a D (compact disc) has been developed, and 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 a recording 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 recording surface of the DVD and reads the signal recorded on the DVD to generate a reproduction signal of the image data.

[0003]

However, since the above-mentioned DVD currently has two or more standards with different characteristics mixed together, a reproducing apparatus compatible with only one standard has a DVD of another method. When I try to play D
There is a problem that a signal cannot be correctly detected from the returning light from the VD.

Thus, 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, it is an object of the present invention to provide an optical disc reproducing apparatus capable of recording and / or reproducing the optical disc of which the user is not aware of. There is.

[0006]

According to the present invention, the above 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. Optical pickup for irradiating light and detecting the returned light, a signal processing circuit for processing a detection signal from the optical pickup to generate image data, and a signal unrecorded portion of the optical disc. By an optical disc reproducing device, which comprises an identification code for discriminating the type of the optical disc, an optical identification means for reading the identification code of the optical disc, and a decoder for processing the signal from the optical identification means and extracting the identification code. Is achieved.

Further, according to the present invention, the above object is to irradiate a recording surface of a rotated optical disc with light to return light to an optical disc on which the image data is digitized, compressed and recorded. In the optical disc discriminating method of the optical disc reproducing device which reproduces the image data recorded on the optical disc by detecting the optical disc, an identification code for discriminating the optical disc system provided in the signal unrecorded portion of the optical disc is used. Read by the identification means, and discriminate the optical disc system based on the identification code,
This is achieved by the discriminating method of the optical disc.

[0008]

According to the above construction, the optical identification means
By reading the identification code provided on the optical disc, for example, the bar code provided on the inner peripheral edge of the optical disc, the method of the optical disc represented by the identification code is determined.

When the signal reading optical pickup also serves as the identification optical pickup, it is not necessary to newly provide the identification optical pickup, so that the number of parts can be reduced and the cost can be reduced. become.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below 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 DVD in a first embodiment of an optical disk reproducing apparatus to which the present invention is applied. still,
Although this apparatus is described as a reproducing apparatus, the same configuration as that of this embodiment can be adopted even in the case of a recording and reproducing apparatus. That is, in FIG. 1, a DVD 10 which is a digital video disc is wholly formed of a disc of polycarbonate or the like, and a center hole 11 to which a turntable which is a rotation drive device is to be engaged is provided at the center thereof. ing. Further, the DVD 10 includes an outer signal recording portion 12 and a signal unrecorded portion 13 near the inner peripheral edge in the radial direction.

In the signal recording portion 12, signals of audio and image data which are digitized and compressed by a predetermined method are recorded along a track in the circumferential direction. Further, as shown in the figure, the signal unrecorded portion 13 is provided with a bar code 14 as an arc-shaped identification code by printing or the like along the circumferential direction. Here, the barcode 14 is D
It is compatible with the VD10 system. The identification code is not limited to the bar code, and other optically readable identification code can be used.

FIG. 2 shows the configuration of the first embodiment of the DVD reproducing apparatus. In FIG. 2, the DVD reproducing device 20
Is a DVD2 that is rotationally driven by a drive mechanism (not shown).
An optical pickup 22 for reading a signal, which emits light to the signal recording portion 21a of No. 1 and detects return light, and a signal processing circuit which processes a detection signal from the optical pickup 22 to generate image data. 23 and DVD2
An optical pickup for identification 24 as an optical identification means for irradiating light to the signal unrecorded portion 21b of No. 1 and detecting return light, and an optical pickup for identification 24.
Bar code decoder 25 to which the detection signal from is input
And a system controller 26 to which a signal from the bar code decoder 25 is input.

The signal reading optical pickup 22 includes a light source for irradiating a light beam such as a laser beam, an optical system including an objective lens for focusing the light beam from the light source on a signal recording surface of the DVD 21, and a signal recording for the DVD 21. And a photodetector that receives return light from the recording surface of the portion 21a, and the spot of the light beam on the signal recording surface of the DVD 21 is within the range of the signal recording portion 21a of the DVD 21.
It is configured to move in a radial direction.

The signal processing circuit 23 includes an optical pickup 2
The detection signal from 2 is input, and the image data recorded on the DVD 21 is generated based on this detection signal and output to an external device such as a display (not shown). In this case, the signal processing circuit 23 is switch-controlled based on a control signal from the system controller 26 so as to reproduce the DVD 21 of the selected system among the DVDs of the plurality of systems. .

The identification optical pickup 24, like the signal reading optical pickup 22, emits a light beam such as a laser beam and a light beam from the light source to the DVD 21.
And an optical system including an objective lens for forming an image on the recording surface of the signal unrecorded portion 21b, and a photodetector for receiving the reflected light from the DVD 21, and the DV of the light beam.
The spot on D21 is the signal unrecorded portion 2 of DVD21.
It is configured to move in the radial direction within the range of 1b.

The bar code decoder 25 receives the detection signal from the identification optical pickup 24 and decodes the bar code based on the detection signal,
Outputs the signal corresponding to the barcode.

The system controller 26 discriminates the system of the DVD 21 based on the signal from the bar code decoder 25, and sends a control signal corresponding to the discriminated system to the signal processing circuit 23.

The DVD reproducing apparatus 20 according to the present embodiment is configured as described above, and when the DVD 21 is reproduced, the identification optical pickup 24 is first set to the DVD 21.
The signal unrecorded portion 21b is accessed to read the bar code provided in the signal unrecorded portion 21b of the DVD 21. As a result, the bar code decoder 25 outputs a signal corresponding to the bar code based on the detection signal from the identification optical pickup 24, and the system controller 26 determines the system of the DVD 21 and performs control corresponding to this system. The signal is output to the signal processing circuit 23.

The signal processing circuit 23 is switched according to the system of the DVD 21 based on the control signal.
After that, the optical pickup 22 for reading the signal reads the DVD 2
The signal recording portion 21a of No. 1 is accessed to read the signal recorded on the signal recording surface of the signal recording portion 21a of the DVD 21. Thus, the DVD reproducing device 20 correctly reproduces the DVD 21 regardless of the method of the DVD 21 at that time.

FIG. 3 shows a second embodiment of the DVD reproducing apparatus according to the present invention. In FIG. 3, the DVD reproducing device 30 is driven to rotate by a drive mechanism (not shown).
A signal recorded portion 31a and a signal unrecorded portion 31 of the VD 31
b, irradiate light and detect return light,
The optical pickup 32, a changeover switch 33 that selectively switches the detection signal from the optical pickup 32, a signal processing circuit 34 that processes the detection signal from the optical pickup 32 to generate image data, and the optical pickup 3
The barcode decoder 35 to which the detection signal from 2 is input
And a system controller 36 to which the signal from the bar code decoder 35 is input.

In this case, the optical pickup 32 includes a light source for irradiating a light beam such as a laser beam, an optical system including an objective lens for focusing the light beam from the light source on the signal recording surface of the DVD 31, and a recording surface of the DVD 21. And a signal detector for receiving return light from the DVD 31. The signal beam is used for signal reading and identification, and the spot of the light beam on the signal recording surface of the DVD 31 is a signal recording portion 31a of the DVD 31 and an unrecorded signal. It is configured to move in the radial direction within the range of the portion 31b. In this case, the optical pickup 32 has two limit switches (not shown) on the inner peripheral side.
One is provided with a signal recording portion 31 during normal reproduction.
The inner edge of a restricts the inward movement of the optical pickup 32, and the other one is a signal unrecorded portion 31 when discriminating a DVD.
The inner peripheral edge of b restricts the movement of the optical pickup 32 inward, and the switching of these limit switches is performed by the system controller 36 at the same time as the switching of the changeover switch 33 to be described later.

When the DVD 31 is reproduced, the changeover switch 33 is first changed over to the bar code decoder 35 side, and after the system controller 36 finishes discriminating the method of the DVD 31, the changeover switch 33 is changed over to the signal processing circuit 34 side. And is controlled by the system controller 36, for example.

Signal processing circuit 34, bar code decoder 3
5. The system controller 36 has the same configuration as the signal processing circuit 23, the bar code decoder 25, and the system controller 26 in the embodiment of FIG.

The DVD reproducing apparatus 30 according to the present embodiment is constructed as described above, and when the DVD 31 is reproduced, the changeover switch 33 is set first by the bar code decoder 3.
5 side, the optical pickup 32 accesses the signal unrecorded portion 31b of the DVD 31, as shown by reference numeral 32a in the drawing, and the signal unrecorded portion 3 of the DVD 31 is recorded.
The bar code provided in 1b is read. As a result, the detection signal from the optical pickup 32 is input to the bar code decoder 35 via the changeover switch 33, and the bar code decoder 35 outputs a signal corresponding to the bar code based on this detection signal, and the system The controller 36 determines the method of the DVD 31 and outputs a control signal corresponding to this method to the signal processing circuit 34. Further, the system controller 36 uses the changeover switch 3
3 is controlled to be switched to the signal processing circuit 34 side.

Then, the signal processing circuit 34 is switched according to the system of the DVD 31 based on the control signal.
After that, the optical pickup 32 accesses the signal recording portion 31a of the DVD 31 to read the signal recorded on the signal recording surface of the signal recording portion 31a of the DVD 31. Thus, the DVD reproducing device 30 has the D
Regardless of the VD31 system, the DVD 31 can be reproduced correctly.

In the above-described embodiment, the DVD reproducing devices 20 and 30 switch the operation of the signal processing circuits 23 and 34 based on the discriminating result of the system of the DVDs 21 and 31, so that the DVDs 21 and 31 are operated. However, the present invention is not limited to this, but is configured to support only one type of DVD, for example, and is determined to be another type of DVD. In that case, the display may be displayed by the display means, or a warning sound or a warning display may be used to notify that effect. Further, in the case of a DVD of another system, it is obvious that the DVD may be ejected from the reproducing device to prevent the reproducing device from malfunctioning.

[0028]

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

[Brief description of drawings]

FIG. 1 is a plan view showing an optical disc in a first embodiment of an optical disc reproducing apparatus according to the present invention.

FIG. 2 is a block diagram showing a configuration of the optical disc reproducing apparatus of FIG.

FIG. 3 is a block diagram showing a configuration of a second embodiment of an optical disk reproducing device according to the present invention.

[Explanation of symbols]

 10 Digital Video Disc (DVD) 11 Center Hole 12 Signal Recording Part 13 Signal Unrecorded Part 14 Bar Code 20 Optical Disc Playback Device 21 DVD 22 Signal Reading Optical Pickup 23 Signal Processing Circuit 24 Identification Optical Pickup 25 Barcode Decoder 26 System Controller 30 optical disk reproducing device 31 DVD 32 dual-purpose optical pickup 33 changeover switch 34 signal processing circuit 35 bar code decoder 36 system controller

Claims (6)

[Claims] 1. A drive unit for rotationally driving an optical disc on which image data is digitized and compressed and recorded, and a signal for irradiating the optical disc rotated by the drive unit with light and detecting the return light. An optical pickup for reading, a signal processing circuit for generating image data by processing a detection signal from the optical pickup, an identification code for discriminating the type of the optical disc provided in the signal unrecorded portion of the optical disc, An optical disc reproducing apparatus comprising: an optical discriminating means for reading the discriminating code of the optical disc; and a decoder for processing the signal from the optical discriminating means to take out the discriminating code. 2. The apparatus according to claim 1, wherein the identification code is a bar code provided along an inner peripheral edge of the disc. 3. An optical pickup for reading the signal,
The device according to claim 1, wherein the device also serves as an optical identification means. 4. The signal processing circuit is controlled based on the identification code from the decoder so that the optical disc of each system is correctly reproduced.
An apparatus according to claim 1. 5. The optical disk is ejected from the apparatus in the case of an optical disk of a specific system based on the identification code from the decoder.
An apparatus according to claim 1. 6. The image data recorded on the optical disk is detected by irradiating a rotating optical disk with light and detecting return light with respect to the optical disk on which the image data is digitized and compressed and recorded. In an optical disc discriminating method of an optical disc reproducing apparatus for reproducing, an optical discriminating means reads an identification code for discriminating a method of an optical disc provided in a signal unrecorded portion of the optical disc, A method for discriminating an optical disc, characterized by discriminating a method.