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Patent US6034668A successfully refreshed from Google Patents.
US6034668A
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US
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Cursor control device
Assignee: Altera Corp
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Filing: 1997-05-07
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Granted: 2000-03-07
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Expires: 2017-05-07
Abstract
Abstract The present invention relates to computer control devices and, more particularly, to devices for controlling the position of a cursor on a computer display. The invention permits improved technology for cursor control devices. Certain embodiments of devices according to the present invention offer an edge detection system that uniquely identifies the maximum and minimum edges for use in a cursor control device, utilizing improved grating plates. Certain embodiments offer more reliable switch cycle detection in a cursor control device.
Inventors
- 👤 Robert E. Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:21
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/03; G06F3/0304; G06F3/0317
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
175 words
An optical grating for use in a cursor control device, comprising: a first row having two or more types of optical segments, wherein a first type of optical segment represents a first logical state and a second type of optical segment represents a second logical state; a second row of optical segments, the second row having optical segments of the first type and optical segments of the second type, wherein the first row and the second row are approximately equal in length, and wherein the second row is disposed adjacent to the first row such that a first end of the first row is adjacent to a first end of the second row and a second end of the first row is adjacent to a second end of the second row; wherein the optical segments at the first ends of the first and second rows are both of the first type, and further wherein the optical segments at the second ends of the first and second rows are, respectively, of the second and first types.
Claim 2
Dependent Claim
175 words
An optical grating for use in a cursor control device, comprising: a first row having two or more types of optical segments, wherein a first type of optical segment represents a first logical state and a second type of optical segment represents a second logical state; a second row of optical segments, the second row having optical segments of the first type and optical segments of the second type, wherein the first row and the second row are approximately equal in length, and wherein the second row is disposed adjacent to the first row such that a first end of the first row is adjacent to a first end of the second row and a second end of the first row is adjacent to a second end of the second row; wherein the optical segments at the first ends of the first and second rows are both of the first type, and further wherein the optical segments at the second ends of the first and second rows are, respectively, of the second and first types.
Claim 3
Dependent Claim
11 words
The optical grating of claim 1, wherein the segments are square.
Claim 4
Dependent Claim
22 words
The optical grating of claim 1, wherein the first type of segment is black and the second type of segment is white.
Claim 5
Dependent Claim
185 words
A mechanical-optical cursor control device employing an optical grating to determine the position of a cursor, wherein the optical grating comprises: a first row having two or more types of optical segments, wherein a first type of optical segment represents a first logical state and a second type of optical segment represents a second logical state; a second row of optical segments, the second row having optical segments of the first type and optical segments of the second type, wherein the first row and the second row are approximately equal in length, and wherein the second row is disposed adjacent to the first row such that a first end of the first row is adjacent to a first end of the second row and a second end of the first row is adjacent to a second end of the second row; wherein the optical segments at the first ends of the first and second rows are both of the first type, and further wherein the optical segments at the second ends of the first and second rows are, respectively, of the second and first types.
Claim 6
Dependent Claim
185 words
A mechanical-optical cursor control device employing an optical grating to determine the position of a cursor, wherein the optical grating comprises: a first row having two or more types of optical segments, wherein a first type of optical segment represents a first logical state and a second type of optical segment represents a second logical state; a second row of optical segments, the second row having optical segments of the first type and optical segments of the second type, wherein the first row and the second row are approximately equal in length, and wherein the second row is disposed adjacent to the first row such that a first end of the first row is adjacent to a first end of the second row and a second end of the first row is adjacent to a second end of the second row; wherein the optical segments at the first ends of the first and second rows are both of the first type, and further wherein the optical segments at the second ends of the first and second rows are, respectively, of the second and first types.
Claim 7
Dependent Claim
12 words
The cursor control device of claim 4, wherein the segments are square.
Claim 8
Dependent Claim
23 words
The cursor control device of claim 4, wherein the first type of segment is black and the second type of segment is white.
Claim 9
Dependent Claim
80 words
A cursor control device, comprising: a cursor positioning system for positioning a cursor on a computer screen; and a switch for selecting the current position of the cursor for further operations, the state of the switch being sampled periodically, wherein the sampling period is longer than the maximum bounce time for the switch, and further wherein each detected switch state is sampled at least twice and a switch state is considered "valid" only if two successive samples are the same.
Claim 10
Dependent Claim
80 words
A cursor control device, comprising: a cursor positioning system for positioning a cursor on a computer screen; and a switch for selecting the current position of the cursor for further operations, the state of the switch being sampled periodically, wherein the sampling period is longer than the maximum bounce time for the switch, and further wherein each detected switch state is sampled at least twice and a switch state is considered "valid" only if two successive samples are the same.
Claim 11
Dependent Claim
23 words
The cursor control device of claim 7, wherein the switch is considered to have changed state if two successive "valid" switch states differ.
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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) | 2003-03-07 | 2003-09-06 | 2004-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-03-07 | 2007-09-06 | 2008-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-03-07 | 2011-09-06 | 2012-03-07 | $7700.00 | Window Closed / Lapsed |