초록 ▼

As a substitute for the conventionally used pair of polarizer panels, a sensor disc is used in relatively rotatable combination with a pair of photo-sensitive elements arranged spatially on one side of the sensor disc and a light source system arranged spacially on the other side of the sensor disc.

As a substitute for the conventionally used pair of polarizer panels, a sensor disc is used in relatively rotatable combination with a pair of photo-sensitive elements arranged spatially on one side of the sensor disc and a light source system arranged spacially on the other side of the sensor disc. The optical transmittancy of the sensor disc changing either continuously and/or discontinuously in a selected diametral direction. The difference in the incident optical quantity caused by relative rotation of the disc and the elements causes generation of corresponding output from a detecting mechanism electrically coupled to the elements. The wide range of the detectable rotation angle enables advantageous use of the sensor for a navigation course finder, linear tracking arm system for record players, automatic steering system and weighing balance.

대표청구항 ▼

An improved rotation angle sensor comprising, a sensor disc supported at the center thereof coinciding with the center of rotation of said rotation angle sensor, said sensor disc allowing a light to pass through at least a part of the area of said disc, a pair of photo-sensitive elements arranged sp

An improved rotation angle sensor comprising, a sensor disc supported at the center thereof coinciding with the center of rotation of said rotation angle sensor, said sensor disc allowing a light to pass through at least a part of the area of said disc, a pair of photo-sensitive elements arranged spatially on one side of said sensor disc, a light source system arranged spatially on the other side of said sensor disc, and a detecting mechanism electrically coupled to said photo-sensitive elements for generation of an output corresponding to detected difference in incident optical quatity, said sensor disc and said photo-sensitive elements being relatively rotatable to each other about said center of rotation and the optical transmittancy of said sensor disc changes in a continuous manner from more opaque to more light transmissive with distance in one direction along a selected diametral line across said disc and the transmittancy is constant along any line crossing said selected diametral line at right angles thereto.