Patent US4931781A successfully refreshed from Google Patents.
US4931781A
Expired / Lapsed
US
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Cursor movement control key switch
Assignee: Canon Inc
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Filing: 1987-02-17
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Granted: 1990-06-05
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Expires: 2007-02-17
Abstract
Abstract A cursor movement control key switch for controlling movement of a cursor on a display screen of a CRT or the like requires only one key. Operation of a single key allows both control of the direction of the cursor, and control of brightness of the display, volume level of sounds at a speaker, a display size of the cursor or the like. A CPU periodically detects the states of signals at terminals corresponding to contacts disposed in the key switch so as to produce signals to perform the above control operations. The key switchy provides improved operability.
Inventors
- 👤 Akira Miyakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:59
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/03; G06F3/033; G06F3/0338
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
101 words
A cursor movement control key comprising: a key top mounted for displacement in a plane and for depression movement in a direction perpendicular to the plane; a plurality of first balls mounted to be moved by the movement of said key top in said plane; a plurality of second balls mounted to be moved by depression movement of said key top in the direction perpendicular to said plane; a plurality of first detection means for detecting the displacement of said plurality of first balls; and a plurality of second detection means for detecting the displacement of said plurality of second balls.
Claim 2
Dependent Claim
101 words
A cursor movement control key comprising: a key top mounted for displacement in a plane and for depression movement in a direction perpendicular to the plane; a plurality of first balls mounted to be moved by the movement of said key top in said plane; a plurality of second balls mounted to be moved by depression movement of said key top in the direction perpendicular to said plane; a plurality of first detection means for detecting the displacement of said plurality of first balls; and a plurality of second detection means for detecting the displacement of said plurality of second balls.
Claim 3
Dependent Claim
35 words
A cursor movement control key according to claim 1, further comprising cursor control means for moving a cursor in accordance with a direction of movement of said key top detected by the first detection means.
Claim 4
Dependent Claim
36 words
A cursor movement control key according to claim 1, further comprising control means for changing the size of a cursor in accordance with a depression movement of said key top detected by the second detection means.
Claim 5
Dependent Claim
28 words
A cursor movement control key according to claim 1, further comprising means for returning said key top to a normal position in the plane and from depressed movement.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-04 | 1993-12-04 | 1994-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-04 | 1997-12-04 | 1998-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-04 | 2001-12-04 | 2002-06-05 | $7700.00 | Window Closed / Lapsed |