KR900006675B1 - Pickup transfer control circuit in optical disk device - Google Patents

Abstract

No content.

Description

Pickup transfer control circuit in optical disk device

1 is a block diagram of a pickup transport control circuit according to the prior art.

2 is a block diagram of a pickup transport control circuit of the optical disk apparatus according to the present invention.

3 is a flowchart for explaining the present invention.

* Explanation of symbols for main parts of the drawings

5: Pickup transfer motor 6: Pickup transfer mechanism

7: new scaler 8: dispenser

9,15: comparator 10,11: address converter

12: memory 13: controller

14 switch 16 amplifier

17: oscillator 18: counter

The present invention converts a position corresponding to a track on an optical disc into an address, compares an address of a desired track with an address corresponding to a current position, and operates a pickup motor to pick up and transfer an optical disk device for quickly searching for a desired track. It relates to a control circuit.

The conventional pickup and transfer control circuit for reproducing an optical disc has set several track intervals to find a desired track in the current track, and used a search (search) function according to the method shown in FIG. Likewise, the controller 4 controls these circuits including the 100 track jump circuit 1, the 10 track jump circuit 2, and the 1 track jump circuit 3. For example, in order to search 221 tracks in the current track, first, target data (221 track jump signals) must be used in the controller 4, in which case the controller 4 switches the switch SW by the control terminal CON. After two consecutive jumps are connected to the 100 track jump circuit (1), the switch (SW) is connected to the 10 track jump circuits (2) for two jumps, and the switch (SW) is connected to the one track jump circuit (3). ) And jump l times.

At this time, the pickup transfer motor 5 places the pickup transfer mechanism 6 driven by the signals sent from the respective track jump circuits 1, 2, and 3 on the track 221 track to be searched. In FIG. 1, the linear scaler 7, the divider 8, and the comparator 9 are for compensating an accurate one revolution of the pickup transfer motor 5. Here, the comparator 9 compares the output of the frequency divider 8 for dividing the signal obtained by the rotation of the motor 5 with the output of the linear scaler 7 to precisely control the rotation speed of the motor faster or slower than present. Done.

However, this conventional method must operate each track jump circuit (1, 2, 3), control the switch (SW) precisely, and in fact, the structure of these track jump circuits is very complicated, so the tracks that visit the track There was a long search problem.

Accordingly, the present invention has been made to solve such a problem. In order to quickly and accurately search for a desired track, the present invention converts the current position data of the pickup and the position data of the desired track into an address converter, whereby the pickup transport motor is driven by the two address differences. It provides a pickup transport control circuit of an optical disk device for precisely controlling the speed of the pickup driving motor by driving the drive speed, storing speed data corresponding to each track address in a memory, and sending a corresponding speed pulse to the pickup transport motor. There is a purpose.

The present invention by achieving the above object is generated by a pickup transport mechanism driven by the pickup transport motor (5) to transport the pickup, a linear scaler for reading the current position of the pickup transport mechanism, and the rotation of the pickup transport motor In the conventional optical disc reproducing apparatus having a first comparator for controlling the pickup and transfer motor by comparing the output amount of the divider and the output amount of the linear scaler, an address corresponding to the current track position output from the linear scaler is generated. A second address converter for generating an address corresponding to a track position for transporting the pickup to a desired track, a memory for storing a rotational speed corresponding to the current pickup position, and during normal playback The output of the first address converter is provided to the memory, and during track search, the controller A second switch by comparing the output of the first address converter blocked by the switching switch during the track search with the output of the first address converter supplied to the memory, and providing the controller with the output of the second address converter; A comparator, an amplifier for driving the pickup transfer motor by amplifying the address of the target track compared in this second comparison, the output signal of the controller which generates data corresponding to the current difference of the pickup position, and an oscillator during normal reproduction It is configured as a counter for counting the signal from the memory according to the reference frequency and generating a frequency pulse proportional to the current pickup moving speed and providing it to the first comparator.

Hereinafter, the present invention will be described in detail with reference to FIGS. 2 and 3 as follows.

2 is a block diagram of a pickup transfer control circuit of the optical disk apparatus according to the present invention, in which the same reference numerals as those in FIG. 1 denote the same parts.

접점에 위치시키고, 픽업이송모터(5) 및 도시하지 않은 턴테이블 구동모터를 작동시켜 광 디스크를 회전시킴과 동시에 픽업이송기구(6)를 광 디스크의 내부로부터 외주로 이송시킨다. 이때 선형스케일러(7)는 픽업이송기구(6)의 현재위치를 읽어내어 그 현재위치에 해당하는 값(트랙에 대한 값)을 어드레스변환기(10)에 제공하는바, 이때 어드레스변환기(10)에서 발생된 어드레스신호는 절환스위치(14)의

접점을 통해 메모리(12)에 입력된다.First, during playback of a normal optical disc (not shown), the controller 13 switches the switching switch 14.

Located at the contact point, the pickup transfer motor 5 and the turntable driving motor (not shown) are operated to rotate the optical disc and simultaneously transfer the pickup transfer mechanism 6 from the inside of the optical disc to the outer periphery. At this time, the linear scaler 7 reads the current position of the pickup transport mechanism 6 and provides the address converter 10 with a value (value for the track) corresponding to the current position. The generated address signal is transferred to the changeover switch 14.

It is input to the memory 12 via a contact.

Since the memory 12 stores the rotation speed data corresponding to the current track position, the rotation speed data for the current track is input to the counter 18. Then, the counter 18 is counted by the counting amount set from the memory 12 by the counting clock of the oscillator 17 under the control of the controller 13. Therefore, the signal generated by the frequency divider 8 and the signal output from the counter 18 are input to the comparator 9, in which the comparator 9 compares these input signals to the speed of the pickup transfer motor 5. Precise control faster or slower than present.

접점에 위치시키는바, 이경우 원하는 목표데이터가 입력되면, 어드레스변환기(11)는 그 데이터에 해당하는 어드레스를 만를어 비교기(15)의 일측에 인가한다. 그리고. 비교기(15)의 타측에는 어드레스변환기(10)에서 출력되는 어드레스 신호가 입력되므로, 비교기(15)는 입력된 원하는(목적하는)곳의 어드레스와 현재의 픽업위치 어드레스를 비교하여 콘트롤러(13)에 제공한다. 이때 콘트롤러(13)는 그 차이의 데이터에 해당하는 것만큼의 신호를 증폭기(16)에 보내어 모터(5)를 가속시켜 원하는 트랙을 정확히 찾게된다.On the other hand, when searching for a track to an arbitrary point by an external command, the controller 13 switches the selector switch 14.

In this case, when the desired target data is input, the address converter 11 applies an address corresponding to the data to one side of the comparator 15. And. Since the address signal output from the address converter 10 is input to the other side of the comparator 15, the comparator 15 compares the input address of the desired (target) location with the current pickup position address to the controller 13. to provide. At this time, the controller 13 sends the signal corresponding to the data of the difference to the amplifier 16 to accelerate the motor 5 to accurately find the desired track.

When the pickup reaches the target track and the data of the address converters 10 and 11 coincide, the controller 13 places the switch 14 at the contact point to allow normal reproduction.

3 is a flowchart for explaining the present invention. First, during normal playback, the pickup travels on a track on the current optical disc (step 101). The error 13 provides a signal to the amplifier 16 to accelerate the pickup motor 5 (step 103). The acceleration of the pickup motor 5 causes the pickup to approach the target track as the pickup approaches the target track. If the current track coincides with the current track (step l04), the acceleration of the feed motor is stopped to maintain constant speed (step 105). If the target track does not coincide with the current track, the program moves from step 104 to step 103. As you progress, you will continue to find the target track. If no funnel or track search signal is input or the feed motor is moved normally after searching, normal playback is maintained (step 106).

The present invention operating as described above converts all the positions corresponding to the tracks on the optical disc into addresses, compares the address of the desired track with the current pickup position address, and drives the pickup and transfer motor by the data desired for the two differences. It has the feature of finding tracks quickly.

Claims (1)

The pickup transport mechanism 6 driven by the pickup transport motor 5 to feed the pickup, the linear scaler 7 reading the current position of the pickup transport mechanism 6, and the pickup transport motor 5 are rotated. To the pickup and transfer control circuit of the optical disc apparatus having a first comparator 9 for controlling the pickup and transfer motor 5 in consideration of the output of the frequency divider 8 and the output of the linear scaler 7 generated accordingly. The first address converter 10 for generating an address corresponding to the current track position output from the linear scaler 7 and: generating an address corresponding to the track position for transferring the pickup to a desired track. The second address converter 11 for. Memory 12 for storing the rotational speed corresponding to the current pickup position, and the output of the first address converter 10 to the memory 12 during normal playback, the controller 13 during the track search Control switch 14 for interrupting the output of the first address converter 10 supplied to the memory 12 under control of the first address converter 10 and the first address converter 10 blocked by the changeover switch 14 during track search. The second comparator 15 and the second comparator 15 for comparing the output of the output with the output of the second address converter 11 to the controller 13 and the second comparator 15 An amplifier 16 for driving the pickup transfer motor 5 by amplifying the output signal of the controller 13 generating the data corresponding to the address and the current pickup position address difference, and the oscillator 17 during normal reproduction. By the reference frequency, the signal from the memory 12 is Accounting and generates a pulse frequency which is proportional to the current pick-up moving speed of the pickup feed control circuit of an optical disk apparatus characterized in that by a counter (18) for providing a first comparator (9) of the.

Images