Optical coordinate input device having light adjusting means loc

Details Optical coordinate input device having light adjusting means loc Optical coordinate input device having light adjusting means loc

1987-08-19

1988-09-13

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250201, G01V 904

Patent

active

047711701

ABSTRACT:
An optical coordinate input device wherein there is no possibility of operation in error or of destruction of a light receiving element and a correct coordinate signal can be produced even if external light of a high intensity acts upon the light receiving element. The device comprises light amount adjusting means of the transmissive type located in front of light receiving elements, and controlling means for controlling the amount of light to be passed through the light amount adjusting means in response to an amount of light incident to the light receiving elements. Thus, if there is the possibility that an output value of the light receiving elements may reach a saturation condition due to external light of a high intensity, the light transmittivity of the light amount adjusting means is lowered to decrease the amount of external light to be received the light receiving elements.

REFERENCES:
patent: 3764813 (1973-10-01), Clement et al.
patent: 4507557 (1985-03-01), Tsikos

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