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:
Jun. 22, 2004
Filed:
Mar. 23, 1999
Atsushi Kanayama, Omiya, JP;
Fuji Photo Optical Co., Ltd., Saitama, JP;
Abstract
The lens control unit determines the operated amount of a control knob with a CPU through a rotary encoder and a counter, and outputs control signals corresponding to the operated amount through a D/A converter and a communication IC. In the initial state, the lens control unit is set in an analog mode, and outputs the control signal in the analog form. If a lens device controlled by the lens control unit has a serial communication function, the lens device transmits a pulse signal or a mode switch signal with an unexpected frequency for an analog signal to the lens control unit by superimposing the pulse signal on an answer signal. The lens control unit counts pulses included in the pulse signal with a counter to detect the mode switch signal. If the counted value of the counter reaches a predetermined value, the lens control unit shift to a digital mode and thereafter outputs the control signal in the digital form.