Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1990-10-09
1991-11-05
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
340710, 74471XY, G01V 904, G06M 700, H01J 4014
Patent
active
050632892
ABSTRACT:
A combined mouse and trackball having its control ball (15) extend past cover 1. Cover 1 has neck hinges (5) so that it pivots in relations to opposing cover (17). A cable (33) at the front communicates with the computer receiving the control signals from the ball. A switch (43) reverses the significance of front-to-back signals from the ball depending on whether an actuator (45) integral with cover 1 engages the switch. In the closed position of cover 1 the bottom of the devise is flat and the ball is upward for use as a trackball. In the open position of cover 1 the device is formed into a mouse with front and rear surfaces (67, 69) to support the ball for frictional movement on a table (71). Latch surfaces ((25, 57 and 25, 65) hold the covers in the two positions until they are manually released.
REFERENCES:
patent: D291318 (1987-08-01), Kim et al.
patent: 4562347 (1985-12-01), Hovey et al.
patent: 4595070 (1986-06-01), Hodges
patent: 4786892 (1988-11-01), Kubo et al.
patent: 4906843 (1990-03-01), Jones et al.
patent: 4917516 (1990-04-01), Retter
patent: 4939508 (1990-07-01), Lawrence et al.
patent: 4952919 (1990-08-01), Nippoldt
Jasinski Joseph E.
Lingle Charles H.
Pollitt Richard F.
Shuman David W.
Brady John A.
Lee John R.
Lexmark International Inc.
Nelms David C.
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