OPTICAL DISK MASTER DISK EXPOSING APPARATUS AND METHOD FOR DETECTING DEFLECTION AMOUNT OF ASYNCHRONOUS ROTATION
PROBLEM TO BE SOLVED: To detect an asynchronous rotation deflection with high accuracy and to change a beam emission position on an optical disk master disk in a radial direction so as to stabilize a track pitch of a locus of beam emission with high accuracy. SOLUTION: An asynchronous rotation defle...
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| creator | ENDO HIDEYASU |
| description | PROBLEM TO BE SOLVED: To detect an asynchronous rotation deflection with high accuracy and to change a beam emission position on an optical disk master disk in a radial direction so as to stabilize a track pitch of a locus of beam emission with high accuracy. SOLUTION: An asynchronous rotation deflection amount detection section 19a receives an output of a rotation deflection sensor 17 placed contactlessly with a turntable 10, detects a rotation deflection amount of the turntable 10, and is provided with: an amplifier 30; an analog/digital converter 31; an encoder 15 for detecting a rotary angle of an SP motor 14, a micro controller 32 for calculating a synchronous rotation deflection amount of the turntable 10 on the basis of an output of the amplifier 30 and the analog/digital converter 31 and a detected value of the encoder 15; and a piezoelectric element 18 for displacing the position of the rotation deflection sensor 17 on the basis of the synchronous rotation deflection amount. COPYRIGHT: (C)2003,JPO |
| format | Patent |
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SOLUTION: An asynchronous rotation deflection amount detection section 19a receives an output of a rotation deflection sensor 17 placed contactlessly with a turntable 10, detects a rotation deflection amount of the turntable 10, and is provided with: an amplifier 30; an analog/digital converter 31; an encoder 15 for detecting a rotary angle of an SP motor 14, a micro controller 32 for calculating a synchronous rotation deflection amount of the turntable 10 on the basis of an output of the amplifier 30 and the analog/digital converter 31 and a detected value of the encoder 15; and a piezoelectric element 18 for displacing the position of the rotation deflection sensor 17 on the basis of the synchronous rotation deflection amount. 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| subjects | INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC ORINFRASONIC WAVES MEASURING MEASURING ANGLES MEASURING AREAS MEASURING IRREGULARITIES OF SURFACES OR CONTOURS MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS PHYSICS TESTING |
| title | OPTICAL DISK MASTER DISK EXPOSING APPARATUS AND METHOD FOR DETECTING DEFLECTION AMOUNT OF ASYNCHRONOUS ROTATION |
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