US3775005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interactive photographic transparency display device
Assignee: Singer Co
•
Filing: 1972-04-07
•
Granted: 1973-11-27
•
Expires: 1992-04-07
Abstract
Abstract A device for displaying photographic transparencies which is capable of interaction with an operator employing a lasing-diode light pen. Two optical systems are provided which utilize filtering means for restricting light conduction within two mutually exclusive bands of wavelengths. One optical system conducts exclusively light having wavelengths which reside within the visual spectrum, and is used for projecting an image from a transparency onto a viewing screen. The second optical system conducts exclusively light having wavelengths within the infrared region, and is used for detecting operator response to an image displayed on the viewing screen. The transparencies are coated over a substantial area thereof with a light filtering material which will inhibit the transmission of infrared light, but will transmit light within the visual spectrum. A small area on the transparency, which corresponds to the correct response, is not coated with the light filtering material and will transmit all light. A photodetector is disposed within the second optical system for detecting light from the lasing-diode light pen. An electrical circuit is also provided between the light pen and the photodetector for improving the signal-to-noise ratio.
Inventors
- 👤 N Szabo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:03
CPC Classifications
G; G09; G09B; G09B7/00; G09B7/06; G09B7/063
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
128 words
An interactive photographic display device comprising: a. a translucent viewing screen; b. means for holding a transparency to be displayed; c. a lasing diode which produces light rays having wavelengths which reside within a limited band and being movable to various points on said screen; d. a light source which has wavelengths which reside without said band; e. a first optical system disposed for projecting an image from said transparency in said holding means onto said viewing screen by means of said light source; f. means for detecting light; g. a second optical system disposed for conducting said light rays passing through said screen to said detecting means; and h. restricting means for conducting through said second optical system light having wavelengths which reside exclusively within said band.
Claim 2
Dependent Claim
128 words
An interactive photographic display device comprising: a. a translucent viewing screen; b. means for holding a transparency to be displayed; c. a lasing diode which produces light rays having wavelengths which reside within a limited band and being movable to various points on said screen; d. a light source which has wavelengths which reside without said band; e. a first optical system disposed for projecting an image from said transparency in said holding means onto said viewing screen by means of said light source; f. means for detecting light; g. a second optical system disposed for conducting said light rays passing through said screen to said detecting means; and h. restricting means for conducting through said second optical system light having wavelengths which reside exclusively within said band.
Claim 3
Dependent Claim
34 words
A device as defined in claim 1 which includes circuit means operatively connected bewteen said lasing diode and said light detecting means for descriminating between light emitted by said lasing diode and extraneous light.
Claim 4
Dependent Claim
141 words
A device as defined in claim 2, wherein said circuit means comprises: a. a bistable one-shot having an input connected to said lasing diode; b. a pair of gated sample-and-hold circuits having their inputs operatively connected to said light detecting means, a first of which is responsive to one state of said bistable one-shot and a second of which is responsive to a second state of said bistable one-shot; c. a pair of integrators having their inputs operatively connected to respective outputs of said pair of gated sample-and-hold circuits; and d. a differential comparator having a first input operatively connected to an output of a first of said pair of integrators, and a second input operatively connected to the output of a second of said pair of integrators, whereby the output of said differential comparator is an indication of a response.
Claim 5
Dependent Claim
28 words
A device as defined in claim 1, wherein said display includes a transparency having discrete transparent regions some of which are coated with a dichroic light filtering material.
Claim 6
Dependent Claim
20 words
A device as defined in claim 1, wherein said band includes light having wavelengths that reside within the infrared region.
Claim 7
Dependent Claim
21 words
A device as defined in claim 5, wherein said first light source is an incandescent light and a dichroic light filter.
Claim 8
Dependent Claim
16 words
A device as defined in claim 6, wherein said restricting means is a dichroic light filter.
Claim 9
Dependent Claim
144 words
An interactive photographic display device comprising: a. a translucent viewing screen; b. means for holding a transparency to be displayed; c. a lasing diode which produces light rays having wavelengths which reside within the infrared region and being movable to various points on said screen; d. An incandescent light source and a dichroic light filter for restricting light to that having wavelengths which reside within the infrared region; e. a first optical system disposed for projecting an image from said transparency in said holding means onto said viewing screen by means of said light source; f. a photodetector; g. a second optical system disposed for conducting said light rays passing through said screen to said photodetector; and h. a dichroic light filter for restricting the conduction of light through said second optical system to that having wavelengths which reside exclusively within the infrared region.
Claim 10
Dependent Claim
144 words
An interactive photographic display device comprising: a. a translucent viewing screen; b. means for holding a transparency to be displayed; c. a lasing diode which produces light rays having wavelengths which reside within the infrared region and being movable to various points on said screen; d. An incandescent light source and a dichroic light filter for restricting light to that having wavelengths which reside within the infrared region; e. a first optical system disposed for projecting an image from said transparency in said holding means onto said viewing screen by means of said light source; f. a photodetector; g. a second optical system disposed for conducting said light rays passing through said screen to said photodetector; and h. a dichroic light filter for restricting the conduction of light through said second optical system to that having wavelengths which reside exclusively within the infrared region.
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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |