Optical encoder with grounded coding plate
AssigneeFanuc Corporation
InventorsMasatoyo Sogabe, Kanemasa Okuda, Tomonaga Yamamoto
Life of this patent
Estimating the term…
Abstract
A chip-mounting portion of a flexible cable (18) having a light-receiving element chip mounted thereon is placed on a shielding plate (22), and a pattern portion (15b) on a fixed coding plate (15) and the shielding plate (22) are grounded, thereby shielding the periphery of the light-receiving element chip to improve noise tolerability with respect to noise generated internally.
Claims4
An optical encoder having a rotary coding plate secured to a shaft for rotating in unison with said shaft, a fixed coding plate arranged to oppose the rotary coding plate with a predetermined spacing therebetween, a light source, and a light-receiving element which receives the light from the light source via the rotary coding plate and fixed coding plate, comprising:
- a shielding plate;
- a light-receiving element chip interposed between said shielding plate and said fixed coding plate;
- a pattern portion formed on said fixed coding plate;
- and
- means for grounding said pattern portion and said fixed plate.
Dependencies are inferred from the claim text.