Patent US6339748B1 successfully refreshed from Google Patents.
US6339748B1
Expired / Lapsed
US
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Coordinate input system and display apparatus
Assignee: Seiko Epson Corp
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Filing: 1998-11-05
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Granted: 2002-01-15
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Expires: 2018-11-05
Abstract
Abstract The present invention has a object to provide a coordinate input system imparting a coordinate input function onto a transmissive screen for image display such as a rear projecting display apparatus, which permits use of a ray reflecting indicator smaller in size and lighter in weight than a light pen and to improve easiness to use. The coordinate input system of the invention has an infrared ray source 3 which projects an infrared ray onto the back surface of the transmissive screen 2 for image display, a CCD camera 4 which covers the back surface of the transmissive screen as a senses range, and an image information processing circuit 5 which generates coordinate information of a ray reflecting indicator 1 located in front of the transmissive screen 2, from output image information of the CCD camera.
Inventors
- 👤 Kazunori Hiramatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:04
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/03; G06F3/041; G06F3/042; G06F3/0425; G01; G01B; G01B11/00; G01B11/002; G01S; G01S5/00; G01S5/16
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
78 words
A coordinate input system, that provides a coordinate input function to a transmissive screen which forms an image projected by an image projector, comprising: an invisible ray projector which projects invisible rays to a plane of said transmissive screen; an invisible ray detector which detects reflected rays which are reflected ones of the invisible rays; and a coordinate processor which determines coordinates relative to said transmissive screen based on an output signal generated by the invisible ray detector.
Claim 2
Dependent Claim
78 words
A coordinate input system, that provides a coordinate input function to a transmissive screen which forms an image projected by an image projector, comprising: an invisible ray projector which projects invisible rays to a plane of said transmissive screen; an invisible ray detector which detects reflected rays which are reflected ones of the invisible rays; and a coordinate processor which determines coordinates relative to said transmissive screen based on an output signal generated by the invisible ray detector.
Claim 3
Dependent Claim
29 words
The coordinate input system according to claim 1 , the invisible ray projector having a projection optical axis that is not normal to the plane of said transmissive screen.
Claim 4
Dependent Claim
28 words
The coordinate input system according to claim 1 , the invisible ray detector having an optical axis that is not normal to the plane of said transmissive screen.
Claim 5
Dependent Claim
35 words
The coordinate input system according to claim 1 , the invisible ray projector comprising a plurality of invisible ray sources which project the invisible rays to different areas of the plane of said transmissive screen.
Claim 6
Dependent Claim
58 words
The coordinate input system according to claim 4 , the plurality of invisible ray sources having projection optical axes that are not normal to the plane of said transmissive screen, and angles of incidence of the projection optical axes of said plurality of invisible ray sources with the plane of said transmissive screen are different from each other.
Claim 7
Dependent Claim
40 words
The coordinate input system according to claim 1 , further comprising a synchronizer which synchronizes a turn-on and a turn-off timing of the invisible rays projected by the invisible ray projector with a frame timing of the invisible ray detector.
Claim 8
Dependent Claim
35 words
The coordinate input system according to claim 1 , further comprising a synchronizer which synchronizes a frame timing of the image projected by the image projector with a frame timing of the invisible ray detector.
Claim 9
Dependent Claim
41 words
The coordinate input system according to claim 1 , the coordinate processor having a disturbance discriminator which compares a luminance level of a turn-off signal generated by the invisible ray detector when the invisible rays are turned off a determination level.
Claim 10
Dependent Claim
29 words
The coordinate input system according to claim 1 , further comprising an indicator that reflects the invisible rays projected by the invisible ray projector to produce the reflected rays.
Claim 11
Dependent Claim
29 words
The coordinate input system according to claim 9 , the indicator including one of an object having a metal-plated tip, a mirror tipped object, or a light reflecting object.
Claim 12
Dependent Claim
24 words
The coordinate input system according to claim 9 , the indicator having a reflective member, the reflective member having a selectivity for infrared rays.
Claim 13
Dependent Claim
27 words
The coordinate input system according to claim 9 , the indicator comprising: an optical filter that selectively allows transmission of infrared rays; and an optical reflective member.
Claim 14
Dependent Claim
33 words
The coordinate input system according to claim 9 , the invisible ray detector having an optical filter which selectively allows transmission of a wavelength range of the reflected rays produced by the indicator.
Claim 15
Dependent Claim
17 words
The coordinate input system according to claim 13 , the wavelength range being in an infrared range.
Claim 16
Dependent Claim
60 words
The coordinate input system according to claim 1 , the output generated by the invisible ray detector being a turn-on signal when the invisible rays projected by the invisible ray projector is turned on, and the output generated by the invisible ray detector being a turn-off signal when the invisible rays projected by the invisible ray projector is turned off.
Claim 17
Dependent Claim
29 words
The coordinate input system according to claim 15 , the coordinate processor includes a subtracter which generates a difference between the turn on signal and the turn off signal.
Claim 18
Dependent Claim
17 words
The coordinate input system according to claim 1 , the invisible ray detector including a CCD camera.
Claim 19
Dependent Claim
29 words
The coordinate input system according to claim 1 , the invisible ray projector and the invisible ray detector facing the same side of the plane of the transmissive screen.
Claim 20
Dependent Claim
101 words
A display apparatus provided with a transmissive screen which forms an image projected by an image projector, the apparatus comprising: an infrared ray projector which projects infrared rays onto a back of said transmissive screen; an indicating device, the indicating device reflecting the infrared rays from a front of the transmissive screen producing reflected rays; an image sensor which senses from the back of the transmissive screen an image of the reflected rays; and an image information processor which determines coordinates specified by the indicating device on said transmissive screen based on an output image signal provided by said image sensor.
Claim 21
Dependent Claim
101 words
A display apparatus provided with a transmissive screen which forms an image projected by an image projector, the apparatus comprising: an infrared ray projector which projects infrared rays onto a back of said transmissive screen; an indicating device, the indicating device reflecting the infrared rays from a front of the transmissive screen producing reflected rays; an image sensor which senses from the back of the transmissive screen an image of the reflected rays; and an image information processor which determines coordinates specified by the indicating device on said transmissive screen based on an output image signal provided by said image sensor.
Claim 22
Dependent Claim
30 words
The coordinate input system according to claim 19 , the indicating device including one of an object having a metal-plated tip, a mirror tipped object, or a light reflecting object.
Claim 23
Dependent Claim
16 words
The coordinate input system according to claim 19 , the image sensor including a CCD camera.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2005-01-14 | 2005-07-16 | 2006-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-01-14 | 2009-07-16 | 2010-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-01-14 | 2013-07-16 | 2014-01-15 | $7700.00 | Window Closed / Lapsed |