Double four-quadrant angle-position detector

Details Double four-quadrant angle-position detector Double four-quadrant angle-position detector

1996-04-18

1998-02-10

Le, Que

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

2502081, 382289, H01J 4014

Patent

active

057172013

ABSTRACT:
A double four-quadrant angle position detector is disclosed. The angle position detector comprises a first orientation detector, a second orientation detector, and a detecting means. The first orientation detector is composed of two pairs of photo-detecting means, arranged on opposite sides along vertical and horizontal directions, respectively, to generate output currents according to the brightness level. Similarly, the second orientation detector can also generate output currents according to brightness level. The detecting means determines a first angle and a second angle according to these output currents and then compares the difference of the first angle and the second angle with a preset threshold. When the difference is greater than the preset threshold, it indicates that an image angle is passing through the sensor.

REFERENCES:
patent: 5144684 (1992-09-01), Inada et al.
patent: 5221835 (1993-06-01), Setani

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