Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1991-09-04
1993-05-11
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
340710, G01V 904
Patent
active
052104052
ABSTRACT:
A pen-type input device for computers includes a ball rotatably supported by an end of a pen-like elongate handle and rotatable in response to the movement of the pen-type input device for causing one or both of first and second rotating detection members to rotate about their own axes extending perpendicular to one another, and a pattern on each respective rotating detecting member having a series of alternating light-reflecting portions and light-absorbing portions for receiving light projected from a light-emitting device and for reflecting light back to a light-sensitive device which in turn sends an electric detection signal to a detecting circuit of a circuit board. The direction of rotation and the amount of movement of each respective rotating member is detected by the detecting circuit and the detected data are sent to a computer whereby a curve corresponding to the movement of the ball is created on a display surface of the computer.
REFERENCES:
patent: 4780707 (1988-10-01), Selker
patent: 4933670 (1990-06-01), Wislocki
patent: 5008528 (1991-04-01), Duchon
Masaki Takeshi
Sato Kimikatsu
Toyoda Ryuichi
Le Que T.
Matsushita Electric - Industrial Co., Ltd.
Nelms David C.
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