The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 24, 1991
Filed:
Jun. 26, 1989
Fumihiko Yokogawa, Saitama, JP;
Yoshihiro Utsumi, Saitama, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
An optical disc with pregrooves arranged circumferentially so as to define a track area, and recording method and apparatus using an optical disc of that type. The disc is characterized by horizontal sync signal formed regions in which the pregrooves are formed in an intermittent manner along a circumference. The recording method and apparatus are characterized by performing a recording operation by irradiating a recording light beam modulated by a video format signal on a track area of an optical disc with pregrooves, generating a sync pulse signal having pulses corresponding to the horizontal sync signal forming area, from an electric signal obtained by a photo-electric conversion of a reflection signal from the optical disc, detecting the phase difference between the sync pulse signal and a horizontal sync pulse signal in the video format signal, and delaying the video format signal in accordance with the magnitude of the phase difference.