Method for controlling beginning position of optical pick-up

专利摘要:
The present invention relates to an initial position control method of an optical pickup for moving an optical pickup to an initial position of an optical disk for servo tuning, comprising: a first step of moving the optical pickup to an initial position of the optical disk when the optical disk is inserted; A second step of detecting a load voltage of a driving means for moving the optical pickup and a count value of an output pulse according to the rotational driving of the driving means during the movement of the optical pickup; And a third step of determining whether the initial position of the optical pickup is shifted based on the detected value, so that the optical pickup can be moved to the initial position (innermost circumference) of the optical disc without a separate configuration such as a limit switch. Therefore, it is a very useful invention that can reduce the cost and volume of the optical disk device.
公开号:KR20040044020A
申请号:KR1020020072511
申请日:2002-11-20
公开日:2004-05-27
发明作者:이수범；박관준
申请人:엘지전자 주식회사；
IPC主号:

专利说明:

Method for controlling beginning position of optical pick-up
[14] The present invention relates to an initial position control method of an optical pickup for moving an optical pickup to an initial position of an optical disk for servo tuning.
[15] 1 shows a configuration of a general optical disc apparatus (DVD Player), which includes an optical pickup 20 for reading a recording signal from an optical disc (DVD) 10; A spindle motor 21 for rotating the optical disc 10; A sled motor 22 for moving the optical pickup 20; A limit switch 23 for outputting a low signal L when the optical pickup 20 moves to the innermost circumference of the optical disc 10; An R / F unit 30 for filtering the signal output by the optical pickup 20 to output a binary signal; A digital signal processor (40) for restoring and outputting the binary signal to original data with its clock synchronized with the binary signal; An amplifier decoder 50 for decoding and outputting the restored output data by using a predetermined MPEG method; A motor drive unit 60 for rotating the optical disc 10 and the optical pickup 20 by applying an appropriate driving voltage to the spindle motor 21 and the sled motor 22; And a microcomputer 70 for determining a current position of the optical pickup 20 based on the output signal of the limit switch 23 and performing a servo tuning operation.
[16] In general, in the optical disk apparatus as shown in FIG. 1, when the optical disk 10 is inserted and mounted, the microcomputer 70 performs a servo tuning operation for reproducing the optical disk 10. In this case, the microcomputer 70 performs the optical pickup. 20 is positioned at the innermost circumference (initial position) of the optical disc 10, and then the servo tuning operation is performed. However, since the current position of the optical pickup 20 is not known before the optical disc 10 is reproduced, the microcomputer 70 first moves the optical pickup 20 to the initial position of the optical disc 10 before the servo tuning operation. This will be described in more detail as follows.
[17] First, when the optical disc 10 is inserted and mounted, the microcomputer 70 applies an appropriate driving voltage to the sled motor 22 to move the optical pickup 20 to an initial position (innermost circumference) of the optical disc 10. In this case, the limit switch 23 outputs an 'L' signal when the optical pickup 20 is located at the innermost circumference of the optical disc 10, so that the microcomputer 70 receives the optical pickup ( During the movement of 20, the output signal of the limit switch 23 is continuously checked to determine whether the optical pickup 20 moves inwardly.
[18] In this way, when it is determined that the optical pickup 20 has moved to the innermost circumference, the microcomputer 70 performs a predetermined servo tuning operation.
[19] However, in the related art, a separate limit switch should be provided in order to determine the innermost movement of the optical pickup 20 as described above.
[20] Accordingly, the present invention has been made to solve the above problems, to provide an initial position control method of the optical pickup to move the optical pickup to the initial position of the optical disk for servo tuning without a separate configuration such as a limit switch The purpose is.
[1] 1 shows a configuration of a general optical disc apparatus (DVD Player),
[2] 2 is a block diagram of an optical disk apparatus in which an initial position control method of an optical pickup according to the present invention is implemented.
[3] Figure 3 shows an example of driving the sled motor of the microcomputer through the motor drive unit,
[4] 4A and 4B illustrate a flow of a preferred embodiment of the initial position control method of the optical pickup according to the present invention;
[5] 5 shows the innermost circumference B and the like of the optical disk as an example.
[6] Fig. 6 shows an example of comparing the load voltage of the sled motor in the normal rotation state and the extreme position control state.
[7] ※ Explanation of code for main part of drawing
[8] 10: optical disk 20: optical pickup
[9] 21: spindle motor 22: sled motor
[10] 23: limit switch 30: R / F section
[11] 40: digital signal processor 50: amplifier decoder
[12] 60: motor drive unit 70: microcomputer
[13] 71: count
[21] An initial position control method of an optical pickup according to the present invention for achieving the above object comprises a first step of moving the optical pickup to the initial position of the optical disk when the optical disk is inserted; A second step of detecting a load voltage of a driving means for moving the optical pickup and a count value of an output pulse according to the rotational driving of the driving means during the movement of the optical pickup; And a third step of determining whether the initial position of the optical pickup is moved based on the detected value.
[22] Hereinafter, a preferred embodiment of an initial position control method of an optical pickup according to the present invention will be described with reference to the accompanying drawings.
[23] FIG. 2 illustrates a configuration of an optical disc apparatus (DVD Player) in which an initial position control method of an optical pickup according to the present invention is implemented. The limit switch 23 of FIG. 1 is removed, and the sled motor 22 It is the same as the structure of FIG. 1 except that it further comprises the counter 23 which counts the output pulse (step pulse) according to rotation.
[24] 3 illustrates an example of driving the sled motor 22 of the microcomputer 70 through the motor drive unit 60.
[25] 4A and 4B illustrate a flow of a preferred embodiment of an initial position control method of an optical pickup according to the present invention. Hereinafter, FIGS. 4A and 4B according to the present invention will be described with reference to FIGS. 2 and 3. The control method of the will be described in detail.
[26] First, the microcomputer 70 outputs pulses of the sled motor 22 detected by an experiment until the optical pickup 20 moves to the innermost circumference of the optical disc 10 (B in FIG. 5). The number of m and the number (n, n> m) of output pulses of the sled motor 22 detected until the movement to the innermost point (C in FIG. 5) are preset. When the optical pickup 20 approaches the innermost circumference of the optical disk 10, the load voltage (d + e in FIG. 6) of the sled motor 22 is preset.
[27] In this state, when the tray into which the optical disc (DVD) 10 is inserted is closed (S10), the microcomputer 70 may perform an initial position (most inner circumference) to perform a servo tuning operation according to the insertion of the optical disc 10. The control operation is performed, as follows.
[28] In general, when the optical disk 10 is inserted, the optical pickup 20 is located at the A point of the optical disk 10. In consideration of this, the microcomputer 70 uses the motor drive unit 60 as shown in FIG. By applying a proper driving voltage to the sled motor 22 through the sled motor 22 to rotate the sled motor 22, the optical pickup 20 is the innermost circumference of the optical disc 10 from the point A which is the current position. At this time, the microcomputer 70 applies an extreme position control method. When the optical pickup 20 approaches the innermost circumference of the optical disc 10, the sled motor 22 is moved. (I.e., as shown in Fig. 6), the load voltage of the sled motor 22 increases by e more than d, which is the load voltage in the normal rotation state, as shown in FIG. Done).
[29] On the other hand, the counter 23 counts the output pulse (step pulse) according to the rotation of the sled motor 22 (S12) and provides the count value to the microcomputer 70.
[30] Accordingly, the microcomputer 70 continuously detects the count value, and if the detected count value is greater than or equal to m (S20), the microcomputer 70 detects the load voltage of the sled motor 22. (S21) If the detected load voltage is within a predetermined allowable range based on a preset value (S30), the microcomputer 70 determines that the optical pickup 20 has moved to the innermost circumference of the optical disc 10. By performing the predetermined servo tuning operation in the state in which the initial position control operation is stopped (S31), a normal playback operation for the optical disc 10 is performed thereafter.
[31] However, if the detected count value is more than m or the detected load voltage is not within a predetermined allowable range based on a preset value, the microcomputer 70 continues to perform the initial position control operation (S40, S50, S51, S60, S61), which is performed until the count value is n, and if the load voltage of the sled motor 22 is predetermined based on the preset value until the count value is n. If not within the range, the microcomputer 70 determines that it is 'Error' (S62).
[32] As mentioned above, preferred embodiments of the present invention are disclosed for the purpose of illustration, and those skilled in the art can improve and change various other embodiments within the spirit and technical scope of the present invention disclosed in the appended claims below. , Replacement or addition would be possible.
[33] The initial position control method of the optical pickup according to the present invention as described above can move the optical pickup to the initial position (innermost) of the optical disc without providing a limit switch, thereby reducing the cost and volume of the optical disc apparatus. It is a very useful invention that can be.

权利要求:
Claims (3)
[1" claim-type="Currently amended] A first step of moving the optical pickup to the initial position of the optical disc when the optical disc is inserted;
A second step of detecting a load voltage of a driving means for moving the optical pickup and a count value of an output pulse according to the rotational driving of the driving means during the movement of the optical pickup; And
And determining a movement of the initial position of the optical pickup based on the detected value.
[2" claim-type="Currently amended] The method of claim 1,
And the initial position is the innermost circumference of the optical disc.
[3" claim-type="Currently amended] The method of claim 2,
And a fourth step of performing a predetermined servo tuning operation when determining that the optical pickup has moved to the initial position in the third step.

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同族专利:

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公开号 | 公开日

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引用文献:

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公开号 | 申请日 | 公开日 | 申请人 | 专利标题

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法律状态:
2002-11-20|Application filed by 엘지전자 주식회사

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2002-11-20|Priority to KR1020020072511A

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2003-10-14|Priority claimed from CNB2003101138631A

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2004-05-27|Publication of KR20040044020A

优先权:

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申请号 | 申请日 | 专利标题

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KR1020020072511A|KR20040044020A|2002-11-20|2002-11-20|Method for controlling beginning position of optical pick-up|