Optical recording/reproducing apparatus, focusing method therefor, and optical disk recording medium

2:

• An optical disk recording/reproducing apparatus as set forth in claim 1, wherein said focus drive controlling means outputs to said focus actuator as said focus drive signal a focus jump drive signal increasing by a certain gradient).

3:

• An optical disk recording/reproducing apparatus as set forth in claim 2, wherein said focus drive controlling means outputs to said focus actuator said focus jump drive signal, then outputs to said focus actuator said first deceleration pulse when said focus error signal exceeds a first threshold value, said summation signal exceeds a second threshold value, and said focus error signal crosses zero.

4:

• An optical disk recording/reproducing apparatus as set forth in claim 3, wherein said focus drive controlling means outputs to said focus actuator as said first deceleration pulse a deceleration pulse signal proportional to a differential of said focus error signal when said focus error signal crosses zero and corresponds to an impulse defined by a product of an amplitude and a first duration.

5:

• An optical disk recording/reproducing apparatus as set forth in claim 4, wherein said focus drive controlling means outputs to said focus actuator as said first deceleration pulse a deceleration pulse signal corresponding to an impulse defined by a product of an amplitude of a value of a differential of said focus error signal when said focus error signal crosses zero multiplied with a coefficient and a first duration.

6:

• An optical disk recording/reproducing apparatus as set forth in claim 5, wherein
• said recording/reproducing apparatus has a high frequency phase advance compensation filtering means for high frequency phase advance compensation processing of said focus error signal, and
• said focus drive controlling means outputs to said focus actuator said first deceleration pulse when a focus error signal compensated for phase advance by said high frequency phase advance compensation filtering means crosses zero.

7:

• An optical disk recording/reproducing apparatus as set forth in claim 1, wherein said focus drive controlling means ends the focus jump operation and switches to focus servo control when a beam spot from said objective lens is positioned at the target positioning recording layer of said multilayer optical disk.

8:

• An optical disk recording/reproducing apparatus as set forth in claim 7, wherein said focus drive controlling means outputs to said focus actuator a second brake pulse for moving said objective lens away from said multilayer optical disk when detecting that said summation signal during said focus servo control falls below a third threshold value lower than said second threshold value.

9:

• An optical disk recording/reproducing method for performing a focus jump operation moving a beam spot among a plurality of recording layers of a multilayer optical disk having a plurality of recording layers corresponding to a record/reproduce operation for recording data on said multilayer optical disk or reproducing data recorded on said multilayer optical disk, comprising:
• a step of outputting to said focus actuator a focus drive signal for moving said objective lens in a focus direction for positioning the beam spot from the objective lens to a target positioning recording layer of said multilayer optical disk when a focus jump start signal and a target positioning recording layer signal are applied and
• a step of outputting to said focus actuator a first deceleration pulse signal by referring to a focus error signal and a summation signal obtained from returned light from said optical disk in accordance with the location of said objective lens moved in accordance with the drive of said focus actuator.

10:

• An optical disk recording/reproducing method as set forth in claim 9, in which said method outputs to said focus actuator as said focus drive signal a focus jump drive signal increasing by a certain gradient.

11:

• An optical disk recording/reproducing method as set forth in claim 10, in which said method outputs to said focus actuator said focus jump drive signal,
• then outputs to said focus actuator said first deceleration pulse signal when said focus error signal exceeds a first threshold value, said summation signal exceeds a second threshold value, and said focus error signal crosses zero.

12:

• An optical disk recording/reproducing method as set forth in claim 11, in which said method outputs to said focus actuator as said first deceleration pulse a deceleration pulse signal proportional to a differential of said focus error signal when said focus error signal crosses zero and corresponding to an impulse defined by a product of an amplitude and a first duration.

13:

• An optical disk recording/reproducing method as set forth in claim 12, in which said method outputs to said focus actuator as said first deceleration pulse a deceleration pulse signal corresponding to an impulse defined by a product of an amplitude of a value of a differential of said focus error signal when said focus error signal crosses zero multiplied with a first coefficient and said first duration.

14:

• An optical disk recording/reproducing method as set forth in claim 13, in which said method performs high frequency phase advance compensation processing of said focus error signal, and
• outputs to said focus actuator said first deceleration pulse when a focus error signal compensated for high frequency phase advance crosses zero.

15:

• An optical disk recording/reproducing method as set forth in claim 9, which
• ends the focus jump operation and switches to focus servo control when a beam spot from said objective lens is positioned at the target positioning recording layer of said multilayer optical disk.

16:

• An optical disk recording/reproducing method as set forth in claim 15, in which said method outputs to said focus actuator a second brake pulse for moving said objective lens away from said multilayer optical disk when detecting that said summation signal during said focus servo control falls below a third threshold value lower than said second threshold value.

19:

• An optical disk recording/reproducing apparatus as set forth in claim 17, wherein said focus drive controlling means outputs to said focus actuator a second deceleration pulse signal for moving said objective lens away from the surface of said multilayer optical disk when a summation signal generated from returned light from said optical disk does not indicate the minimum value from when outputting said acceleration pulse signal until the elapse of a first operation limit time when outputting said acceleration pulse signal and outputting said first deceleration pulse signal.

20:

• An optical disk recording/reproducing apparatus as set forth in claim 17, wherein said focus drive controlling means
• outputs to said focus actuator said first deceleration pulse signal for stopping movement of said objective lens, then waits for exactly a second waiting time, and
• outputs a second deceleration pulse signal for stopping movement of said objective lens to said focus actuator during said second waiting time, when said focus drive controlling means detects that the focus error signal shows the maximum value having a polarity inversed to that in acceleration due to the deceleration of the objective lens by said output of the first deceleration pulse signal.

21:

• An optical disk recording/reproducing apparatus as set forth in claim 20, wherein said focus drive controlling means outputs to said focus actuator as said second deceleration pulse a deceleration pulse signal proportional to a differential of said focus error signal when said focus error signal crosses zero and corresponding to an impulse defined by a product of an amplitude and a first duration.

22:

• An optical disk recording/reproducing apparatus as set forth in claim 21, wherein said focus drive controlling means outputs to said focus actuator as said second deceleration pulse a deceleration pulse signal corresponding to an impulse defined by a product of an amplitude of a value of a differential of said focus error signal when said focus error signal crosses zero multiplied with a second coefficient and a first duration.

23:

• An optical disk recording/reproducing apparatus as set forth in claim 21, wherein
• said recording/reproducing apparatus has a high frequency phase advance compensation filtering means for high frequency phase advance compensation processing of said focus error signal, and
• said focus drive controlling means outputs to said focus actuator said second deceleration pulse when a focus error signal compensated for phase advance by said high frequency phase advance compensation filtering means crosses zero.

24:

• An optical disk recording/reproducing apparatus as set forth in claim 17, wherein said focus drive controlling means ends the focus jump operation and switches to focus servo control when the beam spot from said objective lens is positioned at the target positioning recording layer of said multilayer optical disk.

27:

• An optical disk recording/reproducing method as set forth in claim 25, in which said method outputs to said focus actuator a second deceleration pulse signal for moving said objective lens away from the surface of said multilayer optical disk when a summation signal does not indicate the minimum value from when outputting said acceleration pulse signal until the elapse of a first operation limit time when outputting said acceleration pulse signal and outputting said first deceleration pulse signal.

28:

• An optical disk recording/reproducing method as set forth in claim 25, further having
• a step of outputting to said focus actuator a first deceleration pulse signal for stopping movement of said objective lens, then waiting for exactly a second waiting time and
• a step of outputting a second deceleration pulse signal for stopping movement of said objective lens to said focus actuator during said second waiting time, when that the focus error signal shows the maximum value having a polarity inversed to that in acceleration due to the deceleration of the objective lens, by said output of the first deceleration pulse signal.

29:

• An optical disk recording/reproducing method as set forth in claim 28, in which said method outputs to said focus actuator as said second deceleration pulse a pulse signal proportional to a differential of said focus error signal when said focus error signal crosses zero and corresponding to an impulse defined by a product of an amplitude and a first duration.

30:

• An optical disk recording/reproducing method as set forth in claim 28, in which said method outputs to said focus actuator as said second deceleration pulse a deceleration pulse signal corresponding to an impulse defined by a product of an amplitude of a value of a differential of said focus error signal when said focus error signal crosses zero multiplied with a second coefficient and a first duration.

31:

• An optical disk recording/reproducing method as set forth in claim 30, in which said method outputs to said focus actuator said second deceleration pulse when a focus error signal obtained by high band phase advance compensation processing of said focus error signal crosses zero.

32:

• An optical disk recording/reproducing method as set forth in claim 25, in which said method ends the focus jump operation and switches to focus servo control when a beam spot from said objective lens is positioned at the target positioning recording layer of said multilayer optical disk.

34:

• An optical disk recording/reproducing apparatus as set forth in claim 33, wherein
• said focus drive controlling means outputs to said focus actuator as said acceleration pulse signal an acceleration pulse signal corresponding to a first impulse defined by a product of an amplitude defined in accordance with an amount of movement of the beam spot from said objective lens from a recording layer where the beam spot is positioned to a recording layer for a focus jump designated by said target positioning recording layer signal and a pulse duration.

35:

• An optical disk recording/reproducing apparatus as set forth in claim 33, wherein
• said focus drive controlling means outputs to said focus actuator as said first deceleration pulse signal a pulse signal corresponding to a second impulse defined by a product of an amplitude and pulse duration decelerating said objective lens so that said beam spot is positioned near the recording layer designated by said target positioning recording layer signal.

36:

• An optical disk recording/reproducing apparatus as set forth in claim 35, wherein
• a second impulse of said first deceleration pulse signal is smaller than a first impulse of said acceleration pulse signal.

38:

• An optical disk recording/reproducing apparatus as set forth in claim 33, wherein
• said focus drive controlling means outputs to said focus actuator a deceleration pulse signal for moving said objective lens away from the surface of said multi layer optical disk when a summation signal does not indicate the minimum value from when outputting said acceleration pulse signal until the elapse of a first operation limit time when outputting said acceleration pulse signal and outputting said first deceleration pulse signal.

39:

• An optical disk recording/reproducing apparatus as set forth in claim 38, wherein
• said focus drive controlling means outputs to said focus actuator as said second deceleration pulse a deceleration pulse signal proportional to a differential of said focus error signal when said focus error signal crosses zero and corresponding to an impulse defined by a product of an amplitude and a first duration.

40:

• An optical disk recording/reproducing apparatus as set forth in claim 39, wherein
• said focus drive controlling means outputs to said focus actuator as said second deceleration pulse a deceleration pulse signal corresponding to an impulse defined by a product of an amplitude of a differential of said focus error signal when said focus error signal crosses zero multiplied with a second coefficient and a first duration.

41:

• An optical disk recording/reproducing apparatus as set forth in claim 40, wherein
• said recording/reproducing apparatus has a high frequency phase advance compensation filtering means for high frequency phase advance compensation processing of said focus error signal, and
• said focus drive controlling means outputs to said focus actuator said second deceleration pulse signal when a focus error signal compensated for phase advance by said high frequency phase advance compensation filtering means crosses zero.

42:

• An optical disk recording/reproducing apparatus as set forth in claim 33, wherein
• said focus drive controlling means ends the focus jump operation and switches to focus servo control when a beam spot from said objective lens is positioned at the target positioning recording layer of said multilayer optical disk.

44:

• An optical disk recording/reproducing method as set forth in claim 43, in which said method outputs to said focus actuator as said acceleration pulse signal an acceleration pulse signal corresponding to a first impulse defined by a product of an amplitude defined in accordance with an amount of movement of the beam spot from said objective lens from a recording layer where the beam spot is positioned to a recording layer for a focus jump designated by said target positioning recording layer signal and a pulse duration.

45:

• An optical disk recording/reproducing method as set forth in claim 43, in which said method outputs to said focus actuator as said first deceleration pulse signal a deceleration pulse signal corresponding to a second impulse defined by a product of an amplitude and pulse duration decelerating said objective lens so that said beam spot is positioned near the recording layer designated by said target positioning recording layer signal.

46:

• An optical disk recording/reproducing method as set forth in claim 45, wherein a second impulse of said first deceleration pulse signal is smaller than a first impulse of said acceleration pulse signal.

48:

• An optical disk recording/reproducing method as set forth in claim 43, in which said method outputs to said focus actuator a deceleration pulse signal for moving said objective lens away from the surface of said multilayer optical disk when a summation signal does not indicate the minimum value from when outputting said acceleration pulse signal until the elapse of a first operation limit time when outputting said acceleration pulse signal and outputting said first deceleration pulse signal.

49:

• An optical disk recording/reproducing method as set forth in claim 48, in which said method outputs to said focus actuator as said second deceleration pulse a deceleration pulse signal proportional to a differential of said focus error signal when said focus error signal crosses zero and corresponding to an impulse defined by a product of an amplitude and a first duration.

50:

• An optical disk recording/reproducing method as set forth in claim 49, in which said method outputs to said focus actuator as said second deceleration pulse signal a deceleration pulse signal corresponding to an impulse defined by a product of an amplitude of the differential of said focus error signal when said focus error signal crosses zero multiplied with a second coefficient and said first duration.

51:

• An optical disk recording/reproducing method as set forth in claim 50, in which said method outputs to said focus actuator said second deceleration pulse when a focus error signal obtained by high band phase advance compensation processing of said focus error signal crosses zero.

52:

• An optical disk recording/reproducing method as set forth in claim 43, in which said method ends the focus jump operation and switches to focus servo control when a beam spot from said objective lens is positioned at the target positioning recording layer of said multilayer optical disk.

53:

• An optical disk recording/reproducing apparatus for performing a focus jump operation moving a laser spot among recording layers of a multilayer optical disk having a plurality of recording layers corresponding to a record/reproduce operation for recording data on the multilayer optical disk or reproducing data recorded on said multilayer optical disk,
• said optical disk recording/reproducing apparatus comprising a focus drive controlling means for applying an acceleration pulse signal to a focus actuator which moves said objective lens in a focus direction for moving a beam spot of the objective lens mounted on the optical pick-up from the recording layer of said multilayer optical disk at which the beam spot is located at present to the designated recording layer and then outputting a deceleration pulse signal decelerating the movement of said objective lens in the vicinity of said designated recording layer to said focus actuator and outputting a first impulse of said acceleration pulse signal after making the absolute value larger than a second impulse of said deceleration pulse signal.

54:

• An optical disk recording/reproducing apparatus comprising a focus jump processing means which performs a focus jump operation moving a laser spot among recording layers of a multilayer optical disk having a plurality of recording layers corresponding to a record/reproduce operation for recording data on said multilayer optical disk or reproducing the recorded data,
• said optical disk recording/reproducing apparatus comprising a focus drive controlling means for applying an acceleration pulse signal to a focus actuator for moving the objective lens mounted on the optical pick-up from the recording layer of said multilayer optical disk at which the beam spot is located at present to the designated recording layer, applying a first deceleration pulse signal after that to said focus actuator, and applying a second deceleration pulse signal when the focus error signal becomes not more than a certain level on the recording layer as the target.