发明名称 |
Automatic exposure control system for single reflex camera |
摘要 |
A camera which permits change-over between different light measuring systems is disclosed. The camera includes a first light measuring element which measures light coming from an object to be photographed and an operational amplifier responsive to the element. A light measurement information producing circuit is included for producing a light measurement information signal for exposure computation. A change-over device is connected between the light measurement information producing circuit and the operational amplifier. The change-over device is arranged to be shiftable between a first position wherein the operational amplifier is connected to the light measurement information producing circuit and a second position wherein the operational amplifier is not so connected. An accessory device is attachable to the camera body. The accessory device includes a second light receiving element for measuring light from the object within a light measurement range different from that of the first light receiving element and another operational amplifier responsive thereto. A terminal is responsive to the signal from the latter operational amplifier. The terminal is disposed at the second position of the change-over device so that the signal from the latter operation is applied to the light measurement information producing circuit when the change-over device is in this position.
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申请公布号 |
US4203660(A) |
申请公布日期 |
1980.05.20 |
申请号 |
US19780904819 |
申请日期 |
1978.05.11 |
申请人 |
CANON K K |
发明人 |
AIZAWA, HIROSHI;ITO, TADASHI;TAGUCHI, TETSUYA;TAKISHIMA, YOSHIYUKI;TSUNEKAWA, TOKUICHI;UCHIDOI, MASANORI |
分类号 |
G03B7/085;G03B19/20;(IPC1-7):G03B7/00 |
主分类号 |
G03B7/085 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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