US 2003/0189478 A1Published application

Detection device

OwnerChih-Hsiung Shen, Chun-Fang Hsiaoinventors

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Abstract

The present invention provides a detection device, which comprises a light-emitting device for projecting a light source to a slotted mask. An optical detector is used to detect the light passing through the slots. A plurality of optical detection units are disposed in the optical detector. Each of the optical detection unit comprises an optical detection component for converting light into a current signal. The optical detection component is connected to a signal selection circuit via a current mirror circuit. When the current of one of optical detection units is maximal in all of the optical detection units and larger than a half of the total current, the optical detection unit will output a voltage signal of high voltage. Otherwise, it will output a voltage signal of low voltage. The present invention has the advantages of high resolution and high noise immunity.

Claims9

Dependent claims

A detection device, which is detecting variations of position or angle, said detection device comprising:

a light-emitting device used to generate a light signal for subsequent signal processing and determination;
and
an optical mechanism for receiving the light signal from said light-emitting device and performing an optical processing to guide the light signal to an optical detector after said optical mechanism, said optical detector comprising a plurality of optical detection units for detecting light passing through said optical mechanism, each of said optical detection units comprising an optical detection component for converting the light source into an electric signal and a signal selection circuit connected to said optical detection component via a current mirror circuit, said optical detection unit outputting a logical electric signal and the other of said optical detection units outputting opposite logical electric signals when the current signal of said optical detection unit is maximal in all of said optical detection units.

Dependencies are inferred from the claim text.

Facts

Application: 10/118,372Filed 9 Apr 2002
Published: 9 Oct 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

G06F 3/0421
By opto-electronic means: by interrupting or reflecting a light beam, e.g. optical touch-screen
G01D 5/3473
Using displacement encoding scales: circular or rotary encoders
G06F 3/0312
Detection arrangements using opto-electronic means: for tracking the rotation of a spherical or circular member, e.g. optical rotary encoders used…
G06F 3/03543
With detection of two-dimensional [2D] relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D…