Carriage servo apparatus, information reproduction apparatus and carriage servo control method

Abstract

A carriage servo apparatus according to the present invention comprises: a carriage for supporting a pickup that records or reproduces information relevant to an information recording face; and a carriage motor for moving the carriage in a direction parallel to the information recording face based on a motor drive signal. This carriage servo apparatus further comprises a microcomputer for detecting a minimum value of a motor drive signal required for moving the carriage from its still state, and setting a motor drive signal when recording or reproducing information, based on the detected minimum value.

1 . A carriage servo apparatus comprising a carriage device for supporting a pickup device for recording or reproducing information relevant to an information recording face and a moving device for moving said carriage device in a direction parallel to said information recording face based on a drive signal, said carriage servo apparatus further comprising: 
 an applying time detecting device for detecting an applying time during which said drive signal is applied to said moving device; and    a setting device for setting said drive signal based on said applying time detected.    
   
   
       2 . The carriage servo control apparatus according to  claim 1 , wherein recording or reproducing said information is executed by emitting light beams to said information recording face, said servo control device further comprising an applying device for, in recording or reproducing the information, when a value of an error signal indicating displacement between an emission position of said light beams and a position of an information track on said information recording face in a parallel direction to said direction is equal to or greater than a threshold set based on said applying time detected, applying said drive signal set to said moving device.  
   
   
       3 . The carriage servo apparatus according to  claim 2 , wherein said setting device sets said error signal having a value equal to or greater than said threshold as said drive signal, and wherein said applying device applies said error signal set as the drive signal to said moving device.  
   
   
       4 . A carriage servo control method comprising a process for moving a carriage device for supporting a pickup device for recording or reproducing information relevant to an information recording face in a direction parallel to said information recording face by applying a drive signal to a moving device, wherein said carriage servo control method comprising: 
 a process of detecting an applying time relevant to said moving device for said drive signal; and    a process of setting said drive signal based on said detected applying time.    
   
   
       5 . The carriage servo control method according to  claim 4 , wherein recording or reproducing said information is executed by emitting light beams to said information recording face, said servo control device further comprising an applying device for, in recording or reproducing the information, when a value of an error signal indicating displacement between an emission position of said light beams and a position of an information track on said information recording face in a parallel direction to said direction is equal to or greater than a threshold set based on said applying time detected, applying said drive signal set to said moving device.  
   
   
       6 . The carriage servo control method according to  claim 5 , wherein said process of setting the drive signal sets said error signal having a value equal to or greater than said threshold as said drive signal, and said process of applying the set drive signal to said moving device applies said error signal set as the drive signal to said moving device.