Optical position sensor

Details Optical position sensor Optical position sensor

1997-12-10

1999-10-26

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023118, 250214PR, G01D 534

Patent

active

059733209

ABSTRACT:
An optical position sensor comprises a linearity correction circuit 20 having ROM 22 in which a corresponding table between compensation values and respective rotational angular position of a rotational disk 51. The compensation values are obtained such that an actual relationship is measured between the rotational angular positions of the rotational disk 51 and the output B of a semiconductor position sensing device 54, deviation of the output B of the device 54 from a predetermined linearity relationship (A) is calculated, and compensation values are determined for eliminating the deviation of the output B of the device 54 at respective rotational angular positions of the rotational disk 51. The linearity correction circuit 20 retrieves a compensation value E from ROM 22 based on the output B of the device 54, and compensates the output A so as to produce the sensing output E which has a linearity relationship to the rotational angle of the rotational disk 51.

REFERENCES:
patent: 4692613 (1987-09-01), Masuda et al.
patent: 5132531 (1992-07-01), Duncan et al.
patent: 5136154 (1992-08-01), Carangelo et al.
patent: 5272335 (1993-12-01), Nakaho
patent: 5352968 (1994-10-01), Reni et al.
patent: 5537874 (1996-07-01), Akahane et al.

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