发明名称 Camera with built-in electronic flash and electronic flash device
摘要 A camera with a built-in electronic flash device, includes: a photographing lens; an aperture stop; an electronic flash emitting portion; a light receiving element for receiving light reflected on a photographic object which has been emitted by the flash emitting portion; and an electronic flash circuit for making the flash emitting portion emit light, the flash circuit having an automatic emission control circuit which stops emission of the flash emitting portion when an amount of the reflected light received by the light receiving element reaches a specified value. With respect to the automatic emission control circuit, Amin satisfies the following conditional expression, (A-1) EV<=Amin<=(A+0.5) EV, where Amin represents a minimum exposure value for a recording medium on which a specified photographic object is recorded when the photographic object that is located at a distance falling within a range from a specified shortest distance to a distance determined by both a guide number obtained when the flash emitting portion emits light at full emission and the aperture stop, is photographed, and A represents a theoretical exposure value.
申请公布号 US2002001466(A1) 申请公布日期 2002.01.03
申请号 US20010871530 申请日期 2001.05.31
申请人 NAKANISHI HIROMI;HOSAKA TAKAO 发明人 NAKANISHI HIROMI;HOSAKA TAKAO
分类号 G03B7/16;G03B15/05;H05B41/32;(IPC1-7):G03B15/03 主分类号 G03B7/16
代理机构 代理人
主权项
地址