Double four-quadrant angle-position detector

US5717201A · kind A · utility

Assignee

• National Science Council · TW

Inventors

• Kang Lin · Taipei, TW
• Si-Chen Lee · Taipei, TW

Key dates

• Filing date: Apr 18, 1996
• Grant date: Feb 10, 1998
• Expiry date: Apr 18, 2016

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10F77/957

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.