KR19990057689A - Optical disc player - Google Patents

Abstract

An optical disc player provided with an optical sensor for determining the type of optical disc is disclosed. The disclosed optical disc player is provided with a deck, a turntable on which an optical disc provided with a type mark in a predetermined area is placed, an optical pickup unit for reading information stored in the optical disc, and a predetermined distance from the deck. An optical disc player comprising a printed circuit board having a circuit for driving a turntable and an optical pick-up unit and a kind discriminating means for discriminating the kind of the optical disc, wherein the kind discriminating means irradiates light to an area provided with the kind mark of the optical disc. And an optical sensor that receives light reflected from the area and detects information corresponding to the type of the optical disk. Therefore, the time required for determining the type of optical disc can be shortened.

Description

Optical disc player

The present invention relates to an optical disc player, and more particularly, to an optical disc player having an improved structure for recognizing the type of optical disc.

In general, optical recording media are classified into compact disc series and digital multifunction disc (DVD) series according to the recording method. DVD-based optical recording media can be classified again according to whether information can be recorded. That is, a DVD used exclusively for reproducing information stored in the form of pits, and a DVD-RAM or the like for recording and reproducing information by forming a land and / or groove on a substrate with a phase change recording film or the like are formed.

On the other hand, as shown in Fig. 1, the optical disc 9 has a bar code on the thiosi area 9a to indicate the type of the optical disc in advance in order to identify various types of discs as described above. It is released with the recognition mark (M) formed as shown.

As shown in FIG. 2, a conventional optical disc player includes a deck 1 installed on a frame 6 in a casing 7, a turntable 2 on which an optical disc 9 is placed and rotated thereon, and a deck 1. And at least one optical pickup unit 3 which is provided to record and / or reproduce information on the optical disk 9 in a non-contact manner while reciprocating in the radial direction of the optical disk 9.

In order to record and / or reproduce information on the optical disc 9, such a conventional optical disc player 10 first needs to classify the type of the optical disc 9 and drive a system corresponding to the optical disc 9.

Therefore, when the optical disc 9 is mounted on a tray (not shown) and the optical disc 9 is mounted on the turntable 2, the optical disc player 10 drives the optical pickup unit 3 and at least one optical pickup mounted on the optical pickup unit 3. (4) is used to irradiate a light beam to the optical disc 9, analyze the signal reflected therefrom, and then compare and analyze the size of the S-curve corresponding to the characteristic curve for each optical disc that appears according to the turntable (2). It is determined whether the seated optical disc 9 is a CD or a DVD. The corresponding optical pickup 4 can then read the information recorded on the optical disc 9 or record the information on the optical disc 9.

By the way, as described above, since the characteristic curves are different from each other, the CD and the DVD and the like correspond to each optical disc provided in the optical pickup unit 3 in order to find out the type of the optical disc 9 seated on the turntable 2. The optical pickup unit 3 must be driven via a path and / or means and the difference in the wavelength of the laser diode (not shown) must be analyzed accordingly. For example, the tentable 2 is equipped with a CD. The characteristic curve of the reflected light is irradiated with the optical disc 9 through the optical pickup 4, as in the case where the driven optical pickup unit uses a path for DVD. In a severe case, the characteristic curve of the optical disc 9 should be examined using a DVD path and / or means provided in the optical pickup unit 3 in a case different from the path and means irradiated with the light beam.

As described above, the conventional optical pickup unit 10 consumes a considerable amount of time by recognizing the type of optical disk only by repeating several trials and errors, and there is a problem that the optical disk player may malfunction due to such a delay. .

The present invention has been made to solve the above problems, and an object thereof is to provide an optical disc player having a separate structure for recognizing the type of optical disc.

1 is a schematic plan view of a typical optical disc;

FIG. 2 is a schematic cross-sectional view showing an optical disc player on which the optical disc of FIG. 1 is mounted. FIG.

3 is a schematic sectional view showing an optical disc player according to the present invention;

<Description of the symbols for the main parts of the drawings>

11 ... deck 12 ... turntable

13 Optical pickup unit 15 Printed circuit board

16.Light sensor 17.Spindle motor

18 Casing 19 Optical disc

21 ... frame

An optical disk player according to the present invention includes a deck, a turntable provided on the deck, and a turntable on which an optical disk having a type mark is provided in a predetermined area, an optical pickup unit for reading information stored in the optical disk, and the deck and a predetermined disk. An optical disc player comprising a printed circuit board having a spaced apart interval and having a circuit for driving the turntable and the optical pickup unit, and type discrimination means for discriminating the type of the optical disc. And an optical sensor for irradiating light to an area provided with a type mark and receiving light reflected from the area to detect information corresponding to the type of the optical disc.

Here, the optical sensor is preferably installed on any one of the deck and the printed circuit board.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 3, the optical disc player 20 according to the present invention includes a deck 11 installed on a frame 21 in a casing 18, a turntable 12 installed on the deck 11, and As an optical pickup unit 13 for recording and / or reproducing information on the optical disk 9 rotatable on the turntable 12, and as a kind discriminating means for discriminating the types of the printed circuit board 15 and the optical disk 9; The optical sensor 16 is included.

The turntable 12 is rotatable by the spindle motor 17 and on which the optical disc 9 is placed.

The optical pickup unit 13 is supported by a guide rail (not shown) on the deck 11, and can be reciprocated in the radial direction of the optical disc 9 by a lead screw (not shown) or the like, and is provided on the surface of the optical disc 9. An optical pick-up 14 is mounted which irradiates a light beam, receives light reflected from the light beam, and records and / or reproduces information.

The printed circuit board 15 is provided under the frame 21 and has a circuit which generates a control signal related to the drive of the optical pickup unit 13 and the spindle motor 17 or the like.

In the present embodiment, the optical sensor 16 as the type discriminating means is provided on the printed circuit board 13 and provided on the recognition mark provided in a predetermined area of the optical disc 9, that is, in a table of content area 9a. M) is irradiated with light to receive light reflected therefrom to detect information according to the type of optical disc 9. Here, since the detailed configuration of the optical sensor 16 is as well known, the detailed description thereof will be omitted.

The optical sensor 16 may be installed on the deck 11, in which case, the optical path of the optical sensor 16 irradiated and reflected on the optical disk 9 is relative to that of the printed circuit board 15. By shortening the error range can be reduced, when the optical sensor 16 is installed on the printed circuit board 15 there is no need to install a separate cable has the advantage that the structure can be simplified. On the other hand, when the optical sensor 16 is installed on the printed circuit board 15, openings 11a and 21a are formed in predetermined portions of the deck 11 and the frame 21, respectively, so that the optical beam of the optical sensor 16 is formed. Through this opening 11a, it is possible to irradiate the thiosi region 9a of the optical disc 9.

The operation of the optical disc player according to the present invention as described above is as follows.

First, when the optical disc 9 is mounted on the optical disc player 20 according to the present invention, the turntable 12 may be irradiated with the light beam of the optical sensor 16 to the thiosi area 9a of the optical disc 9. The optical disc 9 is rotated to a predetermined position. Then, the optical sensor 16 irradiates a light beam to the thiosi region 9a and receives the light reflected on the recognition mark M to generate an electrical signal corresponding thereto to recognize the type of the optical disc 9. Can be.

Therefore, in the conventional optical disc player, the optical pickup is driven through a path and / or means corresponding to each optical disc provided in the optical pickup unit in order to distinguish CDs and DVDs having different characteristic curves, and accordingly the wavelength of the laser diode The trouble of repeating trial and error such as having to analyze the difference can be avoided, and the optical disc player can be prevented from malfunctioning due to such delay.

As described above, according to the present invention, since the type of the optical disc is determined using the optical sensor, the time required for the type recognition of the optical disc can be shortened.

Claims (2)

A turntable on which the deck, an optical disc provided with a kind mark in a predetermined area, is placed, an optical pickup unit for reading information stored in the optical disc, spaced apart from the deck at a predetermined interval, and the turntable; An optical disc player comprising a printed circuit board having a circuit for driving the optical pickup unit and type discrimination means for discriminating the type of the optical disc. And the type discriminating means includes an optical sensor for irradiating light to a region provided with a type mark of the optical disk, and receiving light reflected from the region to detect information corresponding to the type of the optical disk. player. The optical disc player of claim 1, wherein the optical sensor is installed on one of the deck and the printed circuit board.