ABSPIELGERAET FUER BILDPLATTEN

• Main Authors: J. CHRISTOPHER,TODD, CHARLES KELLEHER,KEVIN
• Format: Patent
• Language: German
• Published: 01.07.1982
• Subjects: INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; PHYSICS

Video disc player apparatus for aiding the signal recovery stylus to overcome locked grooves insurmountable by normal stylus deflection transducers. The player comprises a signal pickup stylus secured to a first end of a stylus arm, the second end thereof being secured to a carriage mechanism. The carriage mechanism is driven by a servomechanism responsive to the relative stylus-carriage position so as to translate the second end of the stylus arm in consonance with the radial travel of the pickup stylus engaging the disc. Secured within the carriage is a stylus deflection transducer which cooperates with the stylus arm to selectively translate the pickup stylus past a preselected number of grooves when the stylus is prevented from normal progression by a defect occurring on the disc surface. Occasionally defects occur which cannot be bypassed by deflector induced stylus translations due to limitations in the deflector transducer. Upon detection of a failure of deflector induced stylus translations, an offset is applied within the carriage servomechanism tending to impart a mechanical bias between the carriage and stylus arm, which bias produces a force in the stylus arm in a direction to aid the forces applied by the deflection transducer.