Optical system for a single-lens reflex type video still camera
First Claim
1. A video still camera comprising:
- an objective lens;
image receiving means for receiving an image formed by light transmitted through the objective lens;
spatial frequency cutting off means for cutting off a component of the light having a predetermined spatial frequency;
reflecting means, movable between a finder observation position in a photographing path from the objective lens to the image receiving means and a photographing position retracted out of the photographing path, for reflecting light transmitted through the objective lens when the reflecting means is located at the finder observation position; and
moving means for moving the spatial frequency cutting off means and the reflecting means wherein the reflecting means and the spatial frequency cutting off means are interlocking such that the spatial frequency cutting off means is moved into the photographing path when the reflecting means is moved from the finder observation position to the photographing position, and wherein the spatial frequency cutting off means is movable to a retracting position which permits movement of the reflecting means from the photographing position to be finder observation position.
1 Assignment
0 Petitions
Accused Products
Abstract
A video still camera of the single lens reflex type is provided having a movable finder mirror for reflecting light passed through an objective lens, and a movable optical low-pass filter for preventing a light component having a spatial frequency lower than a predetermined value from being incident on an image receiving element. The finder mirror is located at a position in a photographing path through which photographing light passes when the camera is in a finder observation condition, while the optical low-pass filter is located at that position instead of the finder mirror when the camera is in a photographing condition. A driving device for selectively positioning either the finder mirror or the optical low-pass filter at the position is provided. The compactness of the video still camera is improved.
37 Citations
10 Claims
-
1. A video still camera comprising:
-
an objective lens; image receiving means for receiving an image formed by light transmitted through the objective lens; spatial frequency cutting off means for cutting off a component of the light having a predetermined spatial frequency; reflecting means, movable between a finder observation position in a photographing path from the objective lens to the image receiving means and a photographing position retracted out of the photographing path, for reflecting light transmitted through the objective lens when the reflecting means is located at the finder observation position; and moving means for moving the spatial frequency cutting off means and the reflecting means wherein the reflecting means and the spatial frequency cutting off means are interlocking such that the spatial frequency cutting off means is moved into the photographing path when the reflecting means is moved from the finder observation position to the photographing position, and wherein the spatial frequency cutting off means is movable to a retracting position which permits movement of the reflecting means from the photographing position to be finder observation position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A video still camera comprising:
-
an objective lens; image receiving means for receiving an image formed by light transmitted through the objective lens along a photographing path; an optical low-pass filer for cutting off light having a spatia frequency component higher than a predetermined spatial frequency, wherein the filter is selectively movable to a position in the photographing path; a finder mirror for reflecting light transmitted through the objective lens towards a finder optical system, wherein the finder mirror is selectively movable to the position in the photographing path; and moving means for moving the optical low-pass filter and the finder mirror whereby one of them is selectively moved into the position in the photographing path. - View Dependent Claims (10)
-
Specification