| 摘要 |
A camera includes (1) a socket for detachably receiving a flashbulb, (2) a flash sensing member for detecting the presence and absence of a flashbulb in the socket, (3) a diaphragm for adjusting an exposure aperture as a function of whether the ambient light is bright or dim, and (4) a photosensor, responsive to visible light and infrared (IR), for controlling an exposure in accordance with the total visible light and IR passing along a light path to energize the photosensor during an exposure interval. An IR-attenuating filter is mounted for movement between a normal first position in alignment with the light path for effectively blocking IR from impinging upon the photosensor, and an actuated second position outside the light path to enable IR to energize the photosensor. A filter moving member, controlled jointly by the diaphragm and the flash sensing member, enables the filter to be moved out of the photosensor's light path when a scene is to be photographed with flash light and the diaphragm is adjusted for an exposure in dim light, whereby IR influences the control of a flash exposure only when the exposure aperture size is adjusted for dim light.
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