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:
Apr. 10, 1979
Filed:
Jul. 22, 1977
Kuniyoshi Suzaki, Machida, JP;
Akira Ashida, Kanagawa, JP;
Takashi Itani, Kandaiji, JP;
Tateo Yamada, Kanagawa, JP;
Masaya Maeda, Kawasaki, JP;
Kiyoshi Takahashi, Kunitachi, JP;
Hiroyuki Takimoto, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A sound motion picture projection apparatus provided with pressure pad means operable to press a film against magnetic sound recording and reproducing head means disposed along a path of the film for sound recording and/or reproduction. Urging means urge the pressure pad means toward its film pressing position. Externally operable means are provided for shifting the pressure pad means from its film pressing position to a released position against the urging force of the urging means. Releasable locking means are provided for holding the pressure pad means in the released position against the urging force of the urging means; and film detecting means are disposed in said sound film path behind the magnetic head means to detect introduction of the film into the sound film path and to release the locking of the pressure pad means by the locking means. Thereby, when film introduction into the film path for sound recording and/or reproduction is detected by the film detecting means, the pressure pad means is automatically changed from the released position to the film pressing position.