Optical recording/reproducing system, having function of detecting dirt deposition on optical pickup
AssigneeHitachi, Ltd.
InventorsTakashi Hoshino, Takashi Takeuchi
Life of this patent
Estimating the term…
Abstract
An optical recording/reproducing system comprising an optical pickup for recording and/or reproducing of data with respect to an optical recording medium. A reflection factor and a signal amplitude are obtained from the optical recording medium to be driven by the the recording/reproducing system. A reference level for detection of dirt deposition on the optical pickup is obtained on the basis of the reflection factor and signal amplitude information. The reference level for the dirt deposition is compared with a reproduction signal level obtained from the optical recording medium. A determination as to whether dirt is deposited or not is made on the basis of the comparison results.
Claims22
An optical recording/reproducing system for recording/reproducing data with respect to an optical recording medium, comprising:
- an optical pickup;
- means for recording/reproducing data with respect to the optical recording medium using the optical pickup;
- driving means for moving the optical recording medium relative to the optical pickup;
- operational means for computing a reference level for detection of dirt deposition on the optical pickup using reflection factor information and signal amplitude information provided in association with the optical recording medium;
- and
- comparing means for comparing the reference level computed by the operational means with a peak reproduction signal level obtained from the optical recording medium to output a signal indicative of whether the dirt on the optical pickup exceeds the reference level.
An optical recording/reproducing system for recording/reproducing data with respect to an optical recording medium including reflection factor information and signal amplitude information which are provided in a predetermined section on the optical reading medium, comprising:
- an optical pickup;
- means for recording/reproducing data with respect to the optical recording medium using the optical pickup;
- driving means for moving the optical recording medium relative to the optical pickup;
- means for reading the reflection factor information and the signal amplitude information from the preformatted section of the optical recording medium;
- operational means for computing a reference level for detection of dirt deposition on the optical pickup using reflection factor information and signal amplitude information which have been read from the optical recording medium;
- comparing means for comparing the reference level computed by the operational means with a reproduction signal level obtained from the optical recording medium;
- and
- determination means for determining whether the dirt deposition on the optical pickup exceeds the reference level or not on the basis of the comparison result.
An optical recording/reproducing system for recording/reproducing data with respect to an optical recording medium, comprising:
- an optical pickup;
- means for recording/reproducing data with respect to the optical recording medium by using the optical pickup;
- driving means for moving the optical recording medium relative to the optical pickup;
- means for reading reflection factor information and signal amplitude information from the optical recording medium;
- operational means for computing a reproduction signal level under a normal condition, which is determined by reflection factor information and signal amplitude information given in association with the optical recording medium to set a reference level for use in detection of dirt deposition according to the reproduction signal level;
- means for storing a reference level for use in detection of dirt deposition on the optical pickup;
- comparing means for comparing the reference level stored in the storage means with an actual reproduction signal level from the optical recording medium;
- and
- determination means for determining whether the dirt deposition on the optical pickup exceeds the reference level or not using the comparison result.
An optical recording/reproducing system according to claim and further comprising:
- a host computer connected to the optical recording/reproducing system;
- the optical recording/reproducing system including post means for posting an information that dirt is being deposited on the optical pickup when it is determined that the dirt deposition on the optical pickup exceeds the reference level;
- the host computer including a display and having a function for displaying the information that dirt is being deposited on the optical pickup on the display.
An optical recording/reproducing system for recording/reproducing data with respect to an optical recording medium, comprising:
- an optical pickup;
- means for recording/reproducing data with respect to the optical recording medium by using the optical pickup;
- drive means for moving the optical recording medium relative to the optical pickup;
- means for storing a reference level for dirt deposition on the optical pickup, which is obtained using reflection factor information and signal amplitude information given in association with the optical recording medium;
- and
- comparing means for comparing the reference level stored in the storing means with a reproduction signal level from the optical recording medium to output a signal indicative of whether the dirt deposition on the optical pickup exceeds the reference level or not.
A dirt detection method for an optical pickup used in an optical recording/reproducing system, comprising the steps of:
- computing a reference level for dirt deposition on the optical pickup using reflection factor information and signal amplitude information which are given in association with an optical recording medium for use with said optical recording/reproducing system;
- and
- comparing the computed reference level with a reproduction signal level obtained from the optical recording medium to output a signal indicative of whether or not the dirt deposition on the optical pickup exceeds the reference level.
Dependencies are inferred from the claim text.