JPH0235126U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1A is a sectional view showing an optical system of a bifocal camera according to an embodiment of the present invention during short focus photography, and FIG. 1B is a sectional view showing the optical system of the above bifocal camera during long focus photography. , FIG. 2 is a perspective view showing the appearance of the bifocal camera. 5... Short focus lens optical system, 10... Long focus lens optical system, 13... Movable mirror, 17... Fixed mirror, 18... Light blocking plate.

Claims (1)

[Claims for Utility Model Registration] A first lens provided in front of the film surface; a second lens disposed in parallel with the first lens and having a different focal length from the first lens; a fixed mirror that reflects light passing through the lens toward a photographing optical path from the first lens to the film surface; a retracted position that is retracted from the optical path and allows the light from the first lens to enter the film surface and blocks reflected light from the fixed mirror; a movable mirror that rotates between a reflection position that blocks light from the fixed mirror and reflects light from the fixed mirror toward the film surface;
In order to prevent harmful light from the lens from directly entering the film surface, there is a space between the second lens and the film surface within a range that does not impede the light flux from the fixed mirror to the movable mirror and the light flux from the movable mirror to the film surface. a light shielding member that extends and blocks the harmful light, the light shielding member being movable from the light shielding position, the light shielding position being within the retraction space of the movable mirror, and the movable mirror retracting. A bifocal camera characterized in that when moving to a position, the light shielding member is pushed by the movable mirror and moved from the evacuation space.