PURPOSE: To prevent complexing of cameras, and the decrease in the luminous intensity of the visual field of a finder and to permit the use of various kinds of lenses by incorporating a distance measuring mechanism into a photographing lens per se.
CONSTITUTION: When a push switch is operated, an electric power source 11 is supplied to each device, and ultrasonic waves are fed to an object by a distance measuring sensor 13. The reflected waves from the object are received with the sensor 13, the received output whereof is compared with the output of a lens position detector 15 and is amplified by a comparing and amplifying circuit 14. The output thereof is supplied to a checker 16, by which the state of focusing is displayed. Thereby, the complexing of cameras and the decrease in the luminous intensity of the visual field of a finder are prevented, and various kinds of lenses are made usable.
YOSHINO TSUNEMI
KASHIWARA TOSHIJI
MORIOKA AKITOSHI
| JPS5317330A | 1978-02-17 | |||
| JPS5126536A | 1976-03-04 | |||
| JPS5233527A | 1977-03-14 |