US3784720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable visibility simulator
Assignee: Singer Co
•
Filing: 1970-09-14
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Granted: 1974-01-08
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Expires: 1990-09-14
Abstract
Abstract Apparatus to simulate the effects of fog or the like in a film projection visual system. The effects are obtained by placing a fog mask mounted on a moveable holder in the path of the projected image between the film and projection lens. By controlling the vertical position of the mask and holder various degrees of visibility may be simulated.
Inventors
- 👤 M Oliphant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:44
CPC Classifications
G; G09; G09B; G09B9/00; G09B9/02; G09B9/08; G09B9/30; G09B9/32; G09B9/326
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
177 words
In combination with an aircraft simulator having a projection system wherein an image representing a portion of the real world is projected, a simulator of varible visibility conditions comprising: a. a fog mask having a density gradient in one dimension; b. movable support means mounting said fog mask, with said one dimension vertically oriented, in a plane perpendicular to the projection axis and in the path of the image prior to passage of said image through the projection lens of said system; c. a servo system operably coupled to said support means to translate said fog mask vertically so as to intersect any desired portion of said image path; and d. means for controlling said servo system to effect selective positioning of said mask as a function of the visibility conditions to be simulated, said controlling means including means for computing said visibility function from a selected value of visibility range and the value of simulated altitude of the aircraft simulator; and adjustable means for supplying to said computing means an input representative of said visibility range.
Claim 2
Dependent Claim
177 words
In combination with an aircraft simulator having a projection system wherein an image representing a portion of the real world is projected, a simulator of varible visibility conditions comprising: a. a fog mask having a density gradient in one dimension; b. movable support means mounting said fog mask, with said one dimension vertically oriented, in a plane perpendicular to the projection axis and in the path of the image prior to passage of said image through the projection lens of said system; c. a servo system operably coupled to said support means to translate said fog mask vertically so as to intersect any desired portion of said image path; and d. means for controlling said servo system to effect selective positioning of said mask as a function of the visibility conditions to be simulated, said controlling means including means for computing said visibility function from a selected value of visibility range and the value of simulated altitude of the aircraft simulator; and adjustable means for supplying to said computing means an input representative of said visibility range.
Claim 3
Dependent Claim
16 words
The combination of claim 1 wherein said servo system is a direct current position servo system.
Claim 4
Dependent Claim
23 words
The combination of claim 2 further including electrical limit means whereby said servo system is prevented from driving said holder past preset limits.
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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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |