KR100239362B1 - Optical pickup for playing double recorded optical disk of digital video disk player - Google Patents

Abstract

The present invention relates to an optical pickup apparatus for simultaneously reproducing two screens equipped with a plurality of pickups, wherein at least one objective lens 22a (at least) is used to simultaneously reproduce a plurality of signals recorded on different recording layers in a multilayer recording optical disc. A pickup 20 provided with 22b); A delivery mechanism 23 for guiding the pickup 20 to move in the radial direction of the optical disc; A control unit 30 having a microcomputer 31 for controlling the positions of the objective lenses 22a and 22b and a buffer memory 32 for compensating a time difference occurring between the positions of the objective lenses 22a and 22b. A plurality of objective lenses 22a and 22b are coupled to one pickup 20 or coincide two pickups 20a and 20b on the same track of a multi-layer recording optical disc by a lifting movable pressing unit. By controlling to make it possible to simultaneously play back the contents recorded on each layer of the optical disc, the buffer memory 32 is provided so that the temporary storage of the pre-recorded image is possible, thereby making it possible to simultaneously reproduce the multi-angles without errors. The present invention relates to an optical pickup apparatus for simultaneous reproduction of a multi-layer recording optical disc, which can be realized accurately and accurately.

Description

Optical pickup device for simultaneous reproduction of multi-layer recording optical disc

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup apparatus for simultaneously reproducing two screens equipped with a plurality of pickups, and in particular, by controlling two pickups on the same track of a multi-layer recording optical disk, the contents recorded on each layer of the optical disk can be reproduced simultaneously. An optical pickup apparatus for simultaneously reproducing a multi-layer recording optical disc.

A general conventional optical pickup reproducing apparatus includes a sled base 10 supported by an anti-vibration rubber 11, as shown in FIG. Mounted on the upper surface of the sled base 10, the spindle motor 21 for mounting and rotating the optical disk, the objective lens to detect the light coming back from the optical disk after the laser beam is incident on the optical disk ( 22, and a delivery mechanism 23 for guiding the pickup 20 in the radial direction of the optical disc.

The most commonly used method of the transmission mechanism 23 of the optical pickup device was a linear tracking method. According to this method, the pickup 20 is linearly moved in the radial direction of the optical disc. After the pickup 20 is moved to detect the position of the track, the pickup 20 is mounted to the pickup 20 in the radial direction of the optical disc. The objective lens 22 is moved to perform two steps of fine tuning of tracking.

Here, reference numerals 23a and 23b in the drawing mean a guide shaft and a feed auxiliary shaft for guiding the pickup 20 in a predetermined direction, respectively.

On the other hand, some of the recently used digital video disks (DVDs) have recorded software in one side and double layers. Such a multi-layered recording structure DVD can be used for various purposes. In particular, when the first and second layers are played at the same time when used for multi-angle or multi-story, the existing DVD player You can get a unique viewing effect that can not be realized.

For example, it is possible to divide the screen of the TV up and down or to the left and right to reproduce the contents recorded on the first layer of the DVD on one side and the contents recorded on the second layer of the DVD on the other side. That is, when the scenes such as sports games, educational software, or movies are recorded on the first and second floors of the DVD at different shooting angles and reproduced, the high quality viewing environment can be provided to the user.

In order to detect the multilayer recording optical disc, an optical pickup device in which two pickups 20a and 20b are arranged approximately symmetrically about the spindle motor 21 in recent years as shown in FIG. Was presented.

However, when the multi-layered multi-recorded DVD as described above is reproduced by the conventional optical pickup apparatus, no means for controlling the first pickup 20a and the second pickup 20b is provided. Since the pickups 20a and 20b cannot be matched on a certain radius of the optical disk and the time difference due to each position cannot be overcome, only one of contents recorded on the first or second layer of the optical disk is selectively selected. There was a problem in that it could only be played back, or the recorded contents of the first and second layers could not be reproduced at the same time.

In addition, even when a DVD recorded in a multi-angle tomography was played back, a plurality of screens could not be played simultaneously.

Accordingly, an object of the present invention, which is designed to solve the above problems, is to control two pickups on the same track of a multi-layer recording optical disc so that the contents recorded on each layer of the optical disc can be simultaneously reproduced. It is an object of the present invention to provide an optical pickup apparatus for simultaneous reproduction of a recording optical disc.

1 is a plan view of an optical pickup apparatus according to the prior art,

2 is a plan view showing an optical pickup apparatus for simultaneous reproduction of a multilayer recording optical disc according to an embodiment of the present invention;

3 is a plan view showing an optical pickup apparatus for simultaneous reproduction of a multi-layer recording optical disc according to another embodiment of the present invention;

4 is a control flowchart of the optical pickup apparatus for simultaneously reproducing the multi-layer recording optical disc of FIG.

** Explanation of symbols for the main parts of the drawings

10; Sled base 11; Dustproof Rubber

20; Pickup 20a; First pickup

20b; Second pickup 21; Spindle motor

22a; A first objective lens 22b; 2nd objective lens

23; Delivery mechanism 23a; Guide shaft

23b; Feed auxiliary axis 30; Control

31; Microcomputer 32; Buffer memory

The optical pickup apparatus for simultaneously reproducing a multi-layer recording optical disc according to the present invention for achieving the above object includes at least one objective lens for simultaneously reproducing a plurality of signals recorded on different recording layers in the multi-layer recording optical disc simultaneously. Picked up; A delivery mechanism for guiding the pickup to move in the radial direction of the optical disc; And a controller having a microcomputer for controlling the positions of the objective lenses and a buffer memory for compensating the time difference occurring between the positions of the objective lenses.

The pick-up is characterized in that a plurality of objective lenses are arranged adjacent to each other on a track of the same radius from the center of the optical disk to form an integrated structure, and the pickup is guided by one feeding mechanism so as to allow reciprocating movement.

Further, the pick-up has a plurality of structures in which a plurality of objective lenses are disposed to face each other on a track of the same radius from the center of the optical disc, and each of the pickups has a plurality of structures each formed in correspondence with a plurality of pickups including the respective objective lenses. Guided by the delivery mechanism is characterized in that it is installed to enable symmetrical reciprocating movement.

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

2 and 3 show preferred embodiments of an optical pickup apparatus for simultaneous reproduction of a multilayer recording optical disc according to the present invention, respectively.

Fig. 2 shows an embodiment of the present invention in which two objective lenses 22a and 22b are integrally combined in one pickup 20, and a plurality of signals recorded in different recording layers in a multilayer recording optical disc are shown. A pickup 20 equipped with at least one objective lens 22a, 22b for simultaneously reproducing each one; A delivery mechanism 23 for guiding the pickup 20 to move in the radial direction of the optical disc; A control unit 30 having a microcomputer 31 for controlling the positions of the objective lenses 22a and 22b and a buffer memory 32 for compensating a time difference occurring between the positions of the objective lenses 22a and 22b. It consists of.

In more detail, the optical pickup playback apparatus according to the present invention and the sled base (10) is supported by the anti-vibration rubber (11); Pick-up 20 mounted on the upper surface of the sled base 10 and provided with a spindle motor 21 for mounting and rotating the optical disk, and first and second objective lenses 22a and 22b. A delivery mechanism 23 for guiding the pickup 20; Occurs between the positions of the objective lens 22a and 22b and the microcomputer 30 which control the objective lenses 22a and 22b to be positioned on the circumference of the same radius with respect to the spindle motor 21, respectively. The controller 30 includes a buffer memory 40 for compensating for a time difference. In the above configuration, two objective lenses 22a and 22b are mounted on one pickup 20, and guide shafts are disposed on both sides of the pickup 20 to guide the movement of the pickup 20. It is integrated with a pair of delivery mechanism 23 which consists of 23a) and the feed auxiliary shaft 23b.

The optical pickup apparatus according to an exemplary embodiment of the present invention dualizes an optical signal read on the same track of an optical disc through the first and second objective lenses 22a and 22b mounted on the pickup 20. It can be detected by the signal system and played back simultaneously on a monitor such as a TV.

At this time, since the positions of the respective objective lenses 22a and 22b maintain an acute angle, when one track image of the optical disk rotating in the clockwise direction is to be recognized, the acute angles between the objective lenses 22a and 22b are equal to each other. The time difference corresponding to the position difference of is formed. However, this time difference can be overcome by providing the buffer memory 32. That is, the first and second objective lenses 22a and 22b having the difference in position are temporarily stored in the buffer memory 32 of the image which is read ahead of the contents of the image which are read at the same time. By playing back the stored video at the time of playback, simultaneous playback is possible.

On the other hand, in the case of the stationary type, which is not limited by the size of the entire apparatus, as in the other embodiment shown in FIG. 3, the two pickups 20a and 20b are moved around the spindle motor 21. You may arrange | position symmetrically on both sides of (21).

Here, the reference numerals are the case where two pickups 20a and 20b are mounted, and thus, only a plurality of corresponding codes are given in comparison with the embodiment of FIG. 2, and the other reference numerals are the same as in the case of FIG. 2. It is revealed.

In such a configuration, since the positions of the objective lenses 22a and 22b of the first and second pickups 20a and 20b maintain the 180 ° angle, they are intended to recognize any track image of the optical disk rotating clockwise. In this case, a time difference corresponding to 1/2 rotation is formed between each pickup 20a, 20b.

However, this time difference can be overcome by providing the buffer memory 32 as described above. In other words, the previously reproduced image of the image contents read simultaneously through the objective lenses 22a and 22b of the pickups 20a and 20b having the positional difference is temporarily stored in the buffer memory, and after a certain time, the trailing image is stored. By playing back the stored video at the time of playback, simultaneous playback is possible.

FIG. 4 illustrates a control flow diagram of an operation of a microcomputer embedded in the device in order to overcome the time difference between the two screens as described above, thereby enabling simultaneous playback. First, the pickups 20a and 20b are mechanically positioned on the same radius (the same track of the optical disc). Next, the relative position of the first pickup 20a and the relative position of the second pickup 20b are sequentially input to the lifting movement pressing unit, and the relative position values therebetween are compared with each other to compare the second pickup 20b with each other. After correcting the position of, the appropriate voltage for driving the second pickup 20b is determined according to this correction value, and after the position of the second pickup 20b is moved to the normal state by the input voltage value, Simultaneous playback can be achieved by controlling the time difference compensation between the pickups 20a and 20b by the temporary storage of the buffer memory 32.

However, in the second embodiment, since separate pickups 20a and 20b are used, the manufacturing cost is expected to increase considerably in the initial production process. However, given the trend of accelerating the advancement of semiconductor chips, ICs, and the like, it is not necessary to worry about the problem of rising production costs.

In addition, the present invention can be applied not only to DVD, but also to a device for reproducing a compact disk (CD) with a simple modification of the pickup 20, so that the field of application is wide.

The effects of the present invention that can be expected by the configuration and action as described above are as follows.

In the optical pickup apparatus for simultaneously reproducing a multilayer recording optical disc according to the present invention, a plurality of objective lenses 22a and 22b are coupled to one pickup 20 or on a same track of a multilayer recording optical disc by a lifting and moving unit. By controlling the two pickups 20a and 20b to coincide, the contents recorded on each layer of the optical disc can be reproduced at the same time, and a buffer memory 32 is provided for temporary storage of previously recorded images. By doing so, the multi-angle simultaneous playback can be realized clearly and accurately without any error.

Claims (3)

A pickup provided with at least one objective lens for simultaneously simultaneously reproducing a plurality of signals recorded on different recording layers in the multi-layer recording optical disc; A delivery mechanism for guiding the pickup to move in the radial direction of the optical disc; And a control unit having a microcomputer for controlling the positions of the objective lenses and a buffer memory for compensating the time difference occurring between the positions of the respective objective lenses. The method of claim 1, wherein the pick-up is characterized in that a plurality of objective lenses are arranged adjacent to each other on the track of the same radius from the center of the optical disk to form an integrated structure, it is guided by one feeding mechanism is installed to enable reciprocating movement An optical pickup apparatus for simultaneously reproducing a multi-layer recording optical disc. 2. The pickup according to claim 1, wherein a plurality of objective lenses are arranged to face each other on tracks of the same radius from the center of the optical disc to form a plurality of structures each separated from each other, and each pickup corresponds to a plurality of pickups including the respective objective lenses. An optical pickup apparatus for simultaneous reproduction of a multi-layer recording optical disc, characterized in that it is guided by a plurality of delivery mechanisms formed so as to enable symmetrical reciprocating movement.

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