JPH0689440A - Optical disk reproducing device - Google Patents

Abstract

PURPOSE:To suppress the current consumption of an optical disk reproducing device by reading out the disk while decreasing the rotation speed of the disk. CONSTITUTION:Plural tracks selected from among plural tracks t11-t15 arranged adjacent to each other on an optical disk 11 are simultaneously read by an optical pickup 15 composed of plural light emitting elements and light receiving elements, stored in a buffer memory 17 and, by reading out in the same order as that of the rows of tracks, on the optical disk 11 the current consumption is suppressed. Consequently, even by decreasing the rotating speed of the optical disk 11, reading is performed with the same performance as that of a conventional optical disk.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical information recording / reproducing apparatus, and more particularly to an optical disk reproducing apparatus.

[0002]

2. Description of the Related Art An example of a conventional optical disk reproducing apparatus will be described with reference to FIG. The conventional optical disk reproducing device is
As shown in FIG. 2, an optical disc 31 in which data is recorded in a plurality of concentric tracks t31, t32, t33, t34, t35, ... Tn, and a spindle motor 32 for rotating the optical disc 31 in the circumferential direction. , A light emitting element 33 for irradiating a selected arbitrary single track on the rotating optical disk 31, a light receiving element 34 for receiving the reflected light of the irradiated single track and converting it into a signal, and the light emitting element 33 and light receiving An optical pickup 35 including an element 34, a demodulation circuit 36 that reproduces data from a signal output from the optical pickup 35, and a demodulation circuit 36.
The buffer memory 37 temporarily stores the data reproduced by the above and reads it at a constant interval, and the control circuit 38 for controlling each of these elements.

The optical pickup 35 comprises a spindle
Optical disk 3 rotated in the circumferential direction by a motor 32
1 has a plurality of tracks t31, t32, t33, t
Tracking control is performed by the control circuit 38 to read a single track t33 arbitrarily selected from 34, t35 ... Tn. A single track t33 is irradiated by the light emitting element 33, the reflected light thereof is converted into an electric signal by the light receiving device 34, and the data is reproduced by the demodulation circuit 36. The data generated by the demodulation circuit 36 is temporarily stored after being sent to the buffer memory 37.
The data is read out at a certain fixed interval. At this time, variations in data generated over time due to uneven rotation of the spindle motor 32 are absorbed.

The control circuit 38 monitors the amount of data stored in the buffer memory 37 in order to prevent data overflow of the buffer memory 37 and interruption of read data.
The amount of data read from the optical disc 31 is adjusted by controlling the number of revolutions of 2, and the amount of data stored in the buffer memory 37 is controlled to fall within a predetermined range.

When the data to be read is recorded over a plurality of tracks, the single track tn
Each time you read, move the optical pickup 35 to the next track tn
The control circuit 38 performs tracking control of the optical pickup 35 so as to shift to + l.

At present, it is necessary to rotate an optical disk at a high speed because of the relationship between the amount of data that needs to be read out within a unit time and the recording density of the optical disk (for example, in the case of the compact disk which is currently most often used). Requires a large amount of electric power in the spindle motor for rotating the optical disk at 200 to 500 rpm. This is a major factor in increasing the power consumption of the optical disk reproducing apparatus, and in developing a portable apparatus which is driven by a battery, the increase in the size of the battery has been a major obstacle.

[0007]

As described above, in this conventional optical disk reproducing apparatus, since it is necessary to rotate the optical disk at a high speed, a spindle motor for rotating the optical disk requires a lot of electric power. And This has been a major obstacle in promoting the power consumption reduction of the optical disc reproducing apparatus.

The present invention has been made in view of the above-mentioned conventional circumstances, and therefore, an object of the present invention is to provide a novel optical disk reproducing apparatus capable of solving the above problems inherent in the prior art. Especially.

[0009]

In order to achieve the above object, an optical disk reproducing apparatus according to the present invention is configured so that a plurality of tracks adjacent to each other on an optical disk are read at the same time, and signals of each track are independently read. Output optical pickup, a demodulation circuit for reproducing independent data for each of a plurality of tracks read simultaneously from a signal output from the optical pickup, and data for a plurality of tracks reproduced by the demodulation circuit. And a means for reading data from this buffer memory in the same order as the arrangement of tracks on the optical disk.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail with reference to the accompanying drawings with reference to the accompanying drawings.

FIG. 1 is a block diagram showing an embodiment of an optical disk reproducing apparatus according to the present invention. FIG. 1 shows a case where the optical disc is viewed from the side.

Referring to FIG. 1, a plurality of concentric tracks t11, t12, t13, t14, t1.
5 ... tn, an optical disk 11 having data recorded thereon, a spin doll motor 12 for rotating the optical disk 11 in the circumferential direction, and light emission for irradiating a plurality of adjacent tracks t12, t13, t14 on the rotating optical disk 11, respectively. The light receiving elements 141, 142, 143 which respectively receive the reflected light of the elements 131, 132, 133 and the irradiated plurality of tracks t12, t13, t14 and independently convert the reflected light into signals for each of the tracks t12, t13, t14. And the light emitting elements 131, 132, 133 and the light receiving elements 141, 14
Optical pickup 15 composed of 2 and 143
A demodulation circuit 161, 162, 163 for reproducing independent data for each of a plurality of tracks read simultaneously from a signal output from the optical pickup 15, and a track t12 reproduced by the demodulation circuits 161, 162, 163. Independent data is temporarily stored for each of t13 and t14, and the same t1 as the track arrangement on the optical disk 11 is stored.
It is composed of a buffer memory 17 for reading out in the order of 2, t13, and t14 and at a constant interval, and a control circuit 18 thereof.

The optical pickup 15 comprises a spindle
Optical disk 1 rotated in the circumferential direction by a motor 12
A plurality of tracks t11, t12, t13, t
Tracking control is performed by the control circuit 18 in order to read a plurality of tracks t12, t13, t14 arbitrarily selected from 14, t15 ... Tn. Light emitting element 13
A plurality of tracks t12, t1 by 1, 132, 133
3, t14 is irradiated, and the reflected light is received by the light receiving element 141,
142, 143 for each track t12, t13, t1
4 are independently converted into signals and demodulated circuits 161, 16
Independent data is reproduced for each of a plurality of tracks read simultaneously by 2, 163.

The independent data for each track t12, t13, t14 generated by the demodulation circuit 16 is temporarily stored after being sent to the buffer memory 17, and is the same as the track arrangement on the optical disk 11 at t12. , T
The data is read in the order of 13 and t14 and at regular intervals.
At that time, variations in the data generated due to uneven rotation of the spindle motor 12 are absorbed, and at the same time t12 as the track arrangement on the optical disk 11,
Since the reading is performed in the order of t13 and t14, the output of the optical disc reproducing apparatus of FIG. 1 is exactly the same as that of the conventional optical disc reproducing apparatus.

Further, the control circuit 18 monitors the amount of data stored in the buffer memory 17 so that the data overflow of the buffer memory 17 and the data to be read are not interrupted.
Since the amount of data read from the optical disk 11 is adjusted by controlling the number of rotations of 2 and the amount of data stored in the buffer memory 17 is controlled to always be within a predetermined range, When the three tracks described in the embodiment are read simultaneously, the rotation speed of the spindle motor 12 can be suppressed to 1/3. Along with this, the current consumption can be significantly reduced.

[0016]

As described above, the present invention is an optical system for simultaneously reading a plurality of adjacent tracks on the rotating optical disk and independently outputting signals for each track of the plurality of simultaneously read tracks. A pickup, a demodulation circuit that reproduces independent data for each of a plurality of tracks that are simultaneously read from the signal output from the optical pickup, and a buffer that temporarily stores the data of the plurality of tracks that are reproduced by the demodulation circuit. According to the present invention, the memory and the means for reading data from the buffer memory in the same order as the arrangement of tracks on the optical disk are provided. Since the current consumption of the spindle motor is greatly reduced, It can be maintained.

From the above, according to the present invention, the power consumption of the optical disk reproducing apparatus can be greatly reduced, and especially when developing a portable device which is driven by a battery, it is possible to increase the size of the battery. It is possible to obtain a great effect that a smaller optical disk reproducing device can be developed without being invited.

Further, according to the present invention, since reading is shared by a plurality of optical pickups and the reading speed of the optical pickup can be afforded, the recording density of the optical disk can be improved and the cost of the optical pickup can be reduced. It also brings about the effect of increasing the property.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing an example of a conventional optical disc reproducing apparatus.

[Explanation of symbols]

 11, 31 ... Optical disc 12, 32 ... Spindle motor 131, 132, 133, 33 ... Light emitting element 141, 142, 143, 34 ... Light receiving element 15, 35 ... Optical pickup 161, 162, 163, 36 ... Demodulator 17 , 37 ... Buffer memories 18, 38 ... Control circuits t11, t12, t13, t14, t15 ... Tracks t31, t32, t33, t34, t35 ... Tracks

Claims (2)

[Claims] 1. An optical disc in which data is recorded on a plurality of concentrically formed tracks and a plurality of tracks simultaneously read on a plurality of adjacent tracks on the rotating optical disc are independent of signals for each track. The optical pickup that outputs the data, a demodulation circuit that reproduces independent data for each of a plurality of tracks that are simultaneously read from the signal output from the optical pickup, and the data of the plurality of tracks that are reproduced by the demodulation circuit. 2. An optical disk reproducing apparatus comprising: a buffer memory for temporarily storing data; and means for reading data from the buffer memory in the same order as the arrangement of tracks on the optical disk. 2. The optical disk reproducing apparatus according to claim 1, further comprising a pair of a plurality of light emitting elements and light receiving elements in the optical pickup.