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:
May. 06, 1997
Filed:
Nov. 14, 1995
Akira Miyashita, Tokorozawa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An optical information recording and/or reproducing apparatus radiates a leading light beam from a first light source and a trailing light beam from a second light source to follow the leading beam onto an information track in a recording medium and to perform recording of information with the leading beam and verification with the trailing beam. The apparatus includes a common photosensor for detecting parts of light quantities of the light beams from the first and second light sources, a device for intermittently turning off the light beam not used for reproduction of preformat portions out of the leading beam and trailing beam, with respect to the preformat portions, and a light output controller for controlling the leading beam from the first light source and the trailing beam from the second light source at respective predetermined light outputs, based on the light quantities detected by the photosensor and reference values preliminarily set, when one of the leading beam and trailing beam is off and when both of the leading beam and trailing beam are on.