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:
Mar. 29, 1988
Filed:
Apr. 21, 1987
Applicant:
Inventors:
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
35417311 ;
Abstract
A film transportation apparatus having an electric motor as the drive source for transporting the film in which for each frame of the film to be advanced, there are provided a speed control period of, while giving a driving power to the motor, controlling its speed, and a braking period that follows. The factor of causing the speed of movement of the film by the motor to vary is examined in respect to the voltage of the electrical power source, the number of exposed frames of the film and others for the purpose of controlling the effective voltage given to the motor in the speed control period.