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. 03, 2013
Filed:
Dec. 20, 2011
Katsuhiko Nagata, Saitama, JP;
Katsuhiko Nagata, Saitama, JP;
Canon Kabushiki Kaisha, , JP;
Abstract
A lens apparatus includes a zoom, a focus, a zoom position control signal generator, a focus position control signal generator, a first calculator for calculating a present angle of field from zoom and focus positions, a second calculator for calculating a second angle of field based on a zoom control signal and a focus position, a third calculator for calculating a third angle of field based on zoom and focus position control signals, used when the second calculation unit calculates, a base angle-of-field determinater for determining a sum of the present angle of field and a value obtained by subtracting the third angle of field from the second angle of field, as a base angle of field, and a zoom position control determinater for determining a zoom position to a position of the zoom lens corresponding to the base angle of field to which the zoom lens is driven.