Optical disk device having track jumping control

• US 5,648,947 A
• Filed: 03/24/1995
• Issued: 07/15/1997
• Est. Priority Date: 08/09/1994
• Status: Expired due to Fees

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Fujitsu Limited
• Inventors: Hamaguchi, Shingo, Yabuki, Eiji
• Primary Examiner(s): Young, W. R.
• Application Number:
  US08/410,340
• Time in Patent Office: 844 Days
• Field of Search: 369/44.25, 369/44.28-44.29, 369/54, 369/58
• US Class Current: 369/44.28
• CPC Class Codes: G11B 7/08517 with tracking pull-in only
• CPC Class Codes: G11B 7/08529 Methods and circuits to control the velocity of the head as it traverses the tracks

Abstract

An optical disk device in which a moving state of a beam irradiating position is detected during the operation of an optical head in response to a jump signal, and in which an acceleration signal and a deceleration signal for said optical head are corrected based on a detection result for the subsequent jump operation, resulting in canceling an individual difference or the variation of the characteristic of the optical head.

Claims

1. An optical disk device in which an optical disk having a spirally formed recording track is irradiated with a light beam and a beam irradiating position on said optical disk is moved from one recording track to an adjacent recording track at every rotation of said optical disk, comprising:

a movable optical head for emitting the light beam;

jump signal generating means for generating a jump signal including an acceleration signal for accelerating said optical head, a deceleration signal corresponding to said acceleration signal, and a halt period between said acceleration signal and said deceleration signal;

jump detecting means for detecting a moving state of the beam irradiating position moved in response to said jump signal; and

a jump controller for correcting an output time of said acceleration signal and said deceleration signal based on a detection result obtained by said jump detecting means.

2. An optical disk device according to claim 1,

wherein said jump detecting means detects a speed at which the beam irradiating position passes through a substantial middle point between the recording tracks on which the beam irradiating position is positioned before and after the movement, and

said jump controller corrects said acceleration signal and said deceleration signal so that the speed detected by said jump detecting means accord with a predetermined target speed.

3. An optical disk device according to claim 2,

wherein said jump controller sets a predetermined reference value for said halt period, and when the halt period defined through the correction of said acceleration signal and said deceleration signal has a smaller value than said reference value, said jump controller reduces said target speed so that the halt period be not less than said reference value.

4. An optical disk device in which an optical disk having a spirally formed recording track is irradiated with a light beam and a beam irradiating position on said optical disk is moved from one recording track to an adjacent recording track at every rotation of said optical disk, comprising:

a movable optical head for emitting the light beam;

jump signal generating means for generating a jump signal including an acceleration signal for accelerating said optical head, a deceleration signal corresponding to said acceleration signal, and a halt period between said acceleration signal and said deceleration signal;

jump detecting means for detecting a moving state of the beam irradiating position moved in response to said jump signal, wherein said jump detecting means detect a time at which the beam irradiating position passes through a substantial middle point between the recording tracks on which the beam irradiating position is positioned before and after the movement; and

a jump controller for correcting an output time of said acceleration signal and said deceleration signal based on a detection result obtained by said jump detecting means, said jump controller including means for calculating a speed at which the beam irradiating position passes through said substantial middle point based on said time detected by said jump detecting means and an output time for said acceleration signal, and correcting said acceleration signal and said deceleration signal so that the calculated speed accord with a predetermined target speed.

5. An optical disk device according to claim 4, wherein said jump controller corrects said output time for said acceleration signal and said deceleration signal based on said detection result obtained by said jump detecting means.

6. An optical disk device in which an optical disk having a spirally formed recording track is irradiated with a light beam and a beam irradiating position on said optical disk is moved from one recording track to an adjacent recording track at every rotation of said optical disk, comprising:

a movable optical head for emitting the light beam;

jump signal generating means for generating a jump signal including an acceleration signal for accelerating said optical head, a deceleration signal corresponding to said acceleration signal, and a halt period between said acceleration signal and said deceleration signal;

jump detecting means for detecting a moving state of the beam irradiating position moved in response to said jump signal; and

a jump controller for correcting an output time of said acceleration signal and said deceleration signal based on a detection result obtained by said jump detecting means, wherein said jump controller sets a predetermined reference value for said halt period, and when said halt period defined through the correction of said acceleration signal and said deceleration signal has a smaller value than said reference value, said jump controller reduces a predetermined target speed so that said halt period is not less than said reference value.

7. An optical disk device according to claim 6, wherein said jump controller corrects output time for said acceleration signal and deceleration signal based on a detection result obtained by said jump detecting means.