| 摘要 |
PURPOSE:To constitute compactly the titled device by switching an optical path, and providing a semipermeable mirror for rotating in order to form an optical system of a different focal range. CONSTITUTION:A hole 6a of a cover 6 is positioned in front of a long focus lens 1, also a semipermeable mirror 11 is placed at a position where it abuts on a detaining member 13, and a light from an object to be photographed is made incident on the long focus lens 1 through the hole 6a, brought to a total reflection by a total reflection mirror 3 and led to the semipermeable mirror 11. The semipermeable mirror 11 divides the light, based on a transmission factor and a reflection factor which has been set in advance, and accordingly, a part of the light which has been reflected by the semipermeable mirror 11, namely, the light which has been brought to a total reflection is led to a shutter mechanism 9. On the other hand, when the cover 6 is moved in the right direction, and also the semipermeable mirror 11 is rotated centering around a shaft 12 by a rotary means, and placed at a position where it abouts on a detaining member 14 and becomes orthogonal to an optical axis lof a short focus lens 2, the light from the object to be photographed is made incident on the short focus lens 2 through the hole 6a, and led to the semipermeable mirror 11. Accordingly, a part of the light which has passed through the lens 2 transmits through the semipermeable mirror 1 and it is led to the shutter mechanism 9, and supplied to a film 10.
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