| 摘要 |
PROBLEM TO BE SOLVED: To perform adequate exposure adjustment with simple structure. SOLUTION: A shutter aperture 36a is formed on the front surface of a black box base part 36. A spring type shutter blade 37 and diaphragm plates 38 and 39 are turnably attached on the front part of the aperture 36a. The plates 38 and 39 are engaged with an operating pin 46 and turned. The pin 46 is engaged with a cam groove 47 formed on a switching plate 41. Thus, a diaphragm diameter is adjusted in accordance with the turning of the plate 41. Ribs 44a, 44b and 44c controlling the opening position of the blade 37 are provided on the back surface of the plate 41. Thus, the diaphragm aperture and a shutter speed are switched in accordance with the turning of the plate 41, and exposure is adjusted.
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