Photography – With viewfinder – Selective or adjustable viewfinder field
Patent
1996-04-18
1997-10-14
Metjahic, Safet
Photography
With viewfinder
Selective or adjustable viewfinder field
396436, G03B 1310, G03B 1700
Patent
active
056780931
ABSTRACT:
A camera having: a substantially cylindrical-shaped, rotatable cam, limited to rotate unidirectionally. A drive belt conveys rotation of the rotary member, which rotates due to zooming of lens array, to drive the cam. A viewfinder optical system including a stationary objective lens, two prisms, a stationary eyepiece lens, and two variable-power lenses, when coupled with the cam member, advances or withdraws along the optical-axis during movement. An eyepiece variable-power lens is inserted into the optical path of the viewfinder optical system. A viewfinder panoramic field mask is united with an eyepiece variable-power lens. Upper and lower masks change picture size. A first rack extends in a moving direction of the masks. A second rack extends in a moving direction of the viewfinder panoramic field mask. A panoramic-mode setting gear engages the two racks. A plurality of panoramic-mode parallax compensation marks appear at a trimmed range position within the viewfinder field mask. Normal picture size-mode parallax compensation marks are removed from the field during a high power. A viewfinder objective lens sliding axis pin retained by the objective lens or first prism, guides the two variable-power lenses along the optical axis. One end of a viewfinder lens base retained by the stationary objective lens or first prism, has a ditch restraining rotation of the two variable-power lenses about the viewfinder objective lens sliding axis.
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Asakura Yasuo
Kataoka Setsuya
Maeda Yoshihiro
Takahashi Keita
Chizmar John
Metjahic Safet
Olympus Optical Co,. Ltd.
Weinstein Louis
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