Optical rotation encoder for X-Y direction input device

Details Optical rotation encoder for X-Y direction input device Optical rotation encoder for X-Y direction input device

1994-01-04

1996-09-17

Phan, James

Optical: systems and elements

Light control by opaque element or medium movable in or...

With rotating or pivoting element

250229, 250233, G02B 2602

Patent

active

055574505

ABSTRACT:
An optical rotation encoder for an X-Y direction input device includes a light source for emitting therefrom a light, a pair of substantially vertically aligned light responsive elements for receiving the light, and a circular code wheel mounted between the light source and the light responsive elements, provided thereon plural equiangularly distributed apertures every adjacent two of which have a shielding sectorial area and having a first desired distance with respect to the light source and a second desired distance with respect to the light responsive elements for obtaining an X-Y displacement of the input device by plural pulses resulting from the light which is to be received by the light responsive elements and passes through the apertures to be intermittently projected on the light responsive elements when the circular code wheel is in a rotating motion, wherein the light source is a point light source and either the aperture or shielding sectorial area has a width smaller than a combined width of the pair of substantially vertically aligned light responsive elements. Such optical rotation encoder for an X-Y direction input device can provide thereby a relatively high resulting resolution for a related monitor.

REFERENCES:
patent: 4691101 (1987-09-01), Leonard
patent: 5148020 (1992-09-01), Machida
patent: 5155355 (1992-10-01), Kabaya

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