Light chopper assembly
First Claim
1. A light chopper assembly that includesa wheel that is arranged to pass through a fixed light beam and which is formed by joining a pair of similarly shaped thin metal plates in back-to-back contact,said wheel having a series of filter windows circumferentially spaced about a first diameter on the wheel and a second series of clear windows circumferentially spaced about a second diameter on the wheel,a color filter means mounted between the plates behind each filter window,each color filter means being transparent to said light beam to permit light to pass therethrough, andeach filter window being positioned adjacent to a clear window so that two opposed side walls of the adjacent windows lie along a common radius of said wheel whereby each window is capable of passing through the light beam in the same period of time.
3 Assignments
0 Petitions
Accused Products
Abstract
A light chopper wheel for use in a video system that is capable of producing either black and white or full color images. The wheel is formed of two circular sheet metal plates that are joined in back-to-back contact. A first series of circumferentially spaced color filter windows are located about a first diameter on the wheel and a second series of clear windows are circumferentially spaced about a second diameter on the wheel so that a clear window is radially adjacent each color filter window. Recesses are stamped in the back of each plate behind each color filter window and filters are mounted between the plates within the recesses.
-
Citations
10 Claims
-
1. A light chopper assembly that includes
a wheel that is arranged to pass through a fixed light beam and which is formed by joining a pair of similarly shaped thin metal plates in back-to-back contact, said wheel having a series of filter windows circumferentially spaced about a first diameter on the wheel and a second series of clear windows circumferentially spaced about a second diameter on the wheel, a color filter means mounted between the plates behind each filter window, each color filter means being transparent to said light beam to permit light to pass therethrough, and each filter window being positioned adjacent to a clear window so that two opposed side walls of the adjacent windows lie along a common radius of said wheel whereby each window is capable of passing through the light beam in the same period of time.
-
7. A light chopper assembly for use in a video system for creating either black and white images, or full color images of a target, said light chopper assembly including
a pair of complementary circular sheet metal plates each having a flat back surface and a flat front surface, each plate having a plurality of cutouts formed therein, each cutout further including a pair of opposed radially disposed side walls that pass inwardly from outer peripheral wall of the plate toward the center of the plate, a bottom wall extending between the two radially disposed side walls and a rib that extends between the side walls to divide the cutout into an upper aperture and a lower aperture, each plate being deformed outwardly from its back surface toward its front surface to form a recess about the perimeter of each lower aperture, means to join said plates in back-to-back contact so that the apertures are in co-aligned registration with each other whereby the recessed lower apertures form a series of filter windows that are circumferentially spaced about a first diameter and the upper apertures form a series of clear windows that are circumferentially spaced about a second diameter, and a color filter mounted between the plates within each recessed filter window.
Specification