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. 17, 1997
Filed:
Jul. 21, 1995
Toyoji Sasaki, Hachioji, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
A wireless flash photographing system prohibits flash light reception for a predetermined time period when it is determined that received flash light is not an identification signal. Light emission for pre-confirming a shade and main light emission are switched by the identification signal. A flash device applied to this system comprises a power supply circuit section, a light emission section, a control section and a light receiving circuit section. The light emission section comprises a series circuit including a main capacitor, a discharge tube, a diode and an IGBT, a voltage doubler circuit including resistors and a capacitor, and a trigger circuit including a trigger transformer and a trigger capacitor. The light emission section controls the IGBT to start/stop light emission. A CPU of the control section is connected to a terminal X for transmitting a light emission start signal from a camera, a terminal TTL for transmitting a light emission stop signal from the camera, and a GND terminal, as well as to various switches. The CPU receives an identification signal for identifying modeling light emission and main light emission.