초록 ▼

In the disclosed camera, when the object of principal photographic interest becomes so dim as to prevent satisfactory operation of the focus detecting device, or when the actual voltage of a battery falls below a satisfactory operating level for the device, a supplementary device can be rendered ope

In the disclosed camera, when the object of principal photographic interest becomes so dim as to prevent satisfactory operation of the focus detecting device, or when the actual voltage of a battery falls below a satisfactory operating level for the device, a supplementary device can be rendered operative to control setting of a photo-taking lens independently of the focus detecting device. The camera can then be focused at an appropriate distance depending upon the size of diaphragm aperture, namely, in a pan-focus position. According to an embodiment of the invention, an exposure control apparatus in the camera is made associated with the aforesaid two devices to operate in response to the taking lens having been set. The supplementary system is disabled until needed.

대표청구항 ▼

A camera comprising: objective lens means adjustable along an optical axis for focusing on an object; focus detecting means for detecting the focusing condition of the lens means relative to the object and for providing an output representing the focusing condition of the lens means relative to the

A camera comprising: objective lens means adjustable along an optical axis for focusing on an object; focus detecting means for detecting the focusing condition of the lens means relative to the object and for providing an output representing the focusing condition of the lens means relative to the object; supplementary means operable instead of said focus detection means for providing, when operated, an output representing an approximate focusing condition of the lens means relative to the object; condition detecting means for detecting whether the condition for operation of the focus detection means can insure the proper operation of the focus detection means and providing a characteristic output when detecting that the condition cannot insure the proper operation of the focus detection means; output control means for controlling the provision of the output of the focus detection means, said output control means being responsive to the characteristic output of the condition detecting means and for prohibiting the output of the focus detection means in response to said characteristic output of the condition detecting means; manually operable control means adapted for setting said supplementary means to an operative state; and exposure operation control means for controlling the exposure operation of the camera, said exposure operation control means being responsive to the outputs of said focusing detection means and said supplementary means and enabling the exposure operation of the camera only when said lens means is set to the focused position based on the output of said focus detection means or set to the approximately focused position based on the output of said supplementary means.