Photoelectric conversion type rotational position detector

Details Photoelectric conversion type rotational position detector Photoelectric conversion type rotational position detector

1988-12-19

1990-02-20

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250231SE, H01J 4014

Patent

active

049028855

ABSTRACT:
A photoelectric conversion-type rotational position indicator for indicating the rotational position of a rotating body, including a light receiving member having one or more identically shaped light receiving portions made from a photoelectric converting material at predetermined spacings on the light receiving member to generate sinusoidal signals out of phase from each other, and a light shielding member operably connected to the rotating body such that the light shielding member rotates with the rotating body, the light shielding member having windows shaped with an inner curve and an outer curve such that the visible area of each light receiving portion through each of the windows varies in a sinusoidal form of one cycle as the light shielding member rotates, and means for obtaining the phased separated sinusoidal signals by connecting groups of light receiving portions in parallel or series.

REFERENCES:
patent: 4276534 (1981-06-01), Meyer et al.
patent: 4283702 (1981-08-01), Meyer et al.

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