US3586861A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light pen comprising sensors each sensitive to a different wavelength and corresponding filters arranged to selectively provide both large and small effective apertures
Assignee: Electronic Image Systems Corp
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Filing: 1969-03-24
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Granted: 1971-06-22
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Expires: 1989-03-24
Abstract
Abstract The disclosed light pen has a high resolution state and a low resolution state, either of which may be quickly and easily selected. When used to define locations on a cathode-ray tube display device, the low resolution state is particularly useful for erasing or other operations where a large area designation capability is preferable; the high resolution state is useful for pointing and other operations where it is desired to precisely define a location. The disclosed light pen is realized by incorporating plural sensing means each sensitive to a different wavelength of radiation and corresponding large and small areas subtending the aperture each of which transmits the wavelength to which a corresponding sensing means is sensitive. This facilitates electrically switching between a large effective aperture and a small effective aperture.
Inventors
- 👤 Robert E Wernikoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:57
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/03; G06F3/033; G06F3/0354; G06F3/03542
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
77 words
A light pen including: a housing having an aperture; means sensitive to electromagnetic radiation mounted within the housing and comprising independent sensitive elements each responsive to a different wavelength of radiation arranged to receive only radiation passing through the aperture; and means for selectively varying the effective field of view of the sensitive means comprising filter means subtending the aperture and having areas transmitting radiation of different wavelengths corresponding to the wavelength sensitivities of the sensitive elements.
Claim 2
Dependent Claim
77 words
A light pen including: a housing having an aperture; means sensitive to electromagnetic radiation mounted within the housing and comprising independent sensitive elements each responsive to a different wavelength of radiation arranged to receive only radiation passing through the aperture; and means for selectively varying the effective field of view of the sensitive means comprising filter means subtending the aperture and having areas transmitting radiation of different wavelengths corresponding to the wavelength sensitivities of the sensitive elements.
Claim 3
Dependent Claim
155 words
A display system including: a display device for radiating electromagnetic energy from a screen; light pen means including a housing movable to a position in front of the screen and having an aperture facing the screen; radiation sensitive means mounted within the housing to receive only radiation passing through the aperture; means for selectively varying the effective field of view of the radiation sensitive means through the aperture; control means connected to the display device for causing the display device to radiate sequentially from different areas of the screen; and means connecting the radiation sensitive means of the light pen to the control means for correlating radiation of the display device with the response of the radiation sensitive means, said control means also including means for automatically setting the field of view varying means to select the field of view of the radiation sensitive means appropriate to the action being performed by the display system.
Claim 4
Dependent Claim
155 words
A display system including: a display device for radiating electromagnetic energy from a screen; light pen means including a housing movable to a position in front of the screen and having an aperture facing the screen; radiation sensitive means mounted within the housing to receive only radiation passing through the aperture; means for selectively varying the effective field of view of the radiation sensitive means through the aperture; control means connected to the display device for causing the display device to radiate sequentially from different areas of the screen; and means connecting the radiation sensitive means of the light pen to the control means for correlating radiation of the display device with the response of the radiation sensitive means, said control means also including means for automatically setting the field of view varying means to select the field of view of the radiation sensitive means appropriate to the action being performed by the display system.
Claim 5
Dependent Claim
78 words
A display system as set forth in claim 2 in which the radiation sensitive means includes a plurality of radiation sensitive elements each responsive to a different wavelength of radiation from the screen, and in which the means for varying the effective field of view includes filter means within the housing, the filter means having filter areas defining different fields of view and transmitting radiation of wavelengths corresponding to the different wavelength sensitivities of the radiation sensitive elements.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |