Patent US5138304A successfully refreshed from Google Patents.
US5138304A
Expired / Lapsed
US
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Projected image light pen
Assignee: HP Inc
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Filing: 1990-08-02
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Granted: 1992-08-11
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Expires: 2010-08-02
Abstract
Abstract A technique for interaction with a projected video image with a light pen and/or target marks on the projection screen in which light reflected from the projected image is compared with the video image to detect the position of a spot positioned on the projected image by the light pen and/or the reflection of the target marks. The computer used to generate the video image is then caused to position a cursor in the video image in response to the spot position and/or otherwise modify the generated and/or projected video image.
Inventors
- 👤 Barry Bronson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:57
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/03; G06F3/033; G06F3/038; G06F3/0386
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
80 words
A system for providing interaction with a projected video image, comprising: means for generating a video image; means for projecting an enlarged version of the video image; a light pen for generating a spot on the projected image; and image comparison means for causing the video image generating means to respond to differences between the video image and the projected image; wherein the image comparison means compares the combination of the projected image and the spot to the video image.
Claim 2
Independent Claim
80 words
A system for providing interaction with a projected video image, comprising: means for generating a video image; means for projecting an enlarged version of the video image; a light pen for generating a spot on the projected image; and image comparison means for causing the video image generating means to respond to differences between the video image and the projected image; wherein the image comparison means compares the combination of the projected image and the spot to the video image.
Claim 3
Dependent Claim
33 words
The system of claim 1, wherein the image comparison means, further comprises: means for repositioning a position designator in the video image in accordance with the spot position on the projected video image.
Claim 4
Dependent Claim
69 words
The system of claim 2 wherein the image comparison means further comprises: optical means for capturing light reflected from the projected image; detection means responsive to the optical means for detecting the reflected light; comparator means for comparing the detected light and the video image to determine light pen spot location; and means responsive to the comparator means for providing the video image generating means with spot position information.
Claim 5
Dependent Claim
29 words
The system of claim 3 wherein the optical means further comprises: a beam splitter for directing the projected video image while directing the reflected light to the comparator means.
Claim 6
Independent Claim
89 words
A system for providing interaction with a projected video image, comprising: means for generating a video image; means for projecting an enlarged version of the video image; a projection screen on which the enlarged version of the video image is projected; target marks on the projection screen; and image comparison means for causing the video image generating means to respond to differences between the video image and the projected image; wherein the image comparison means compares the combination of the projected image and the targets to the video image.
Claim 7
Independent Claim
89 words
A system for providing interaction with a projected video image, comprising: means for generating a video image; means for projecting an enlarged version of the video image; a projection screen on which the enlarged version of the video image is projected; target marks on the projection screen; and image comparison means for causing the video image generating means to respond to differences between the video image and the projected image; wherein the image comparison means compares the combination of the projected image and the targets to the video image.
Claim 8
Dependent Claim
23 words
The system of claim 5 wherein the video image generating means generates a modified video image in response to the image comparison means.
Claim 9
Dependent Claim
23 words
The system of claim 6 wherein the video image projecting means projects a modified video image in response to the image comparison means.
Claim 10
Independent Claim
65 words
A method of providing interaction with a projected video image, comprising the steps of: generating a video image; projecting an enlarged version of the video image; generating a spot on the projected image; comparing the combination of the projected image and the spot to the video image; and modifying the video image generated in response to differences between the video image and the projected image.
Claim 11
Independent Claim
65 words
A method of providing interaction with a projected video image, comprising the steps of: generating a video image; projecting an enlarged version of the video image; generating a spot on the projected image; comparing the combination of the projected image and the spot to the video image; and modifying the video image generated in response to differences between the video image and the projected image.
Claim 12
Dependent Claim
33 words
The method of claim 8 wherein the step of modifying the video image further comprises: repositioning a position designator in the video image in accordance with the spot position on the projected image.
Claim 13
Dependent Claim
35 words
The method of claim 9 wherein the image comparison step further comprises: detecting the light reflected from the projected image; and comparing the detected light and the video image to determine light pen spot location.
Claim 14
Dependent Claim
37 words
The method of claim 10 wherein the step of detecting the reflected light includes the step of: projecting the video image through a beam splitter while directing the reflected light from the projected video image for comparison.
Claim 15
Dependent Claim
39 words
The method of claim 8 further comprising the steps of: projecting the projected video image on a projection screen including target marks; and comparing the combination of the projected image and the target mark reflections to the video image.
Claim 16
Dependent Claim
18 words
The method of claim 12 wherein a modified video image is generated in response to the image comparison.
Claim 17
Dependent Claim
18 words
The method of claim 13 wherein a modified video image is projected in response to the image comparison.
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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) | 1995-08-11 | 1996-02-10 | 1996-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-11 | 2000-02-10 | 2000-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-11 | 2004-02-10 | 2004-08-11 | $7700.00 | Window Closed / Lapsed |