Patent US3843255A successfully refreshed from Google Patents.
US3843255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film speed enhancement camera
Assignee: C AND C RES Inc
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Filing: 1973-10-23
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Granted: 1974-10-22
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Expires: 1993-10-23
Abstract
Abstract A camera having a controlled internal light source for enhancing the speed and sensitivity of the film therein at the time of exposure. The light is below the level necessary for visual fogging but decreases the amount of image photons required to reach the threshold density of the film.
Inventors
- 👤 M Cole
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:42
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/02; G03B17/12; G03B17/14; G03B19/00; G03B19/02; G03B19/04; G03B7/00; G03B7/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
166 words
An improved camera comprising: a light restrictive housing; means for retaining photographic film within said housing adjacent one side thereof for recording an original image of a subject resulting from exposure of said photographic film to image light from said subject; optical means mounted in another side of said housing for focusing an image of a subject on the plane of said film; an independently energized, non-image source for providing light to the phtotsensitive surface of said film, said non-image source comprising; a light emitting element; and a light pipe within said housing for transmitting light from said light emitting element to a location in front of said film in a dispersed pattern to evenly expose said film to said nonimage light; and means within said housing for subjecting said film to non-image light from said source substantially simultaneously with the exposure of said film to image light from the subject being photographed thereby enhancing the speed of said film while preserving its inherent image quality.
Claim 2
Dependent Claim
166 words
An improved camera comprising: a light restrictive housing; means for retaining photographic film within said housing adjacent one side thereof for recording an original image of a subject resulting from exposure of said photographic film to image light from said subject; optical means mounted in another side of said housing for focusing an image of a subject on the plane of said film; an independently energized, non-image source for providing light to the phtotsensitive surface of said film, said non-image source comprising; a light emitting element; and a light pipe within said housing for transmitting light from said light emitting element to a location in front of said film in a dispersed pattern to evenly expose said film to said nonimage light; and means within said housing for subjecting said film to non-image light from said source substantially simultaneously with the exposure of said film to image light from the subject being photographed thereby enhancing the speed of said film while preserving its inherent image quality.
Claim 3
Dependent Claim
43 words
The camera recited in claim 1 wherein said light source comprises a lamp and a light transmitting rod, said rod being formed in a circle between said lens assembly and said film and having a light diffusing surface directing light toward said film.
Claim 4
Dependent Claim
43 words
The camera recited in claim 1 wherein said light source comprises a lamp and a fiber optic bundle, said bundle having the fiber ends opposite said bulb arranged in a circle between said film and said lens assembly, directing light toward said film.
Claim 5
Dependent Claim
50 words
The camera recited in claim 1 wherein said light emitting element comprises a light eMitting diode and said light pipe comprises a light transmitting rod, said rod being formed in a circle between said focusing means and said film and having a light diffusing surface directing light toward said film.
Claim 6
Dependent Claim
52 words
The camera recited in claim 1 wherein said light emitting element comprises a light emitting diode and said light pipe comprises a fiber optic bundle, said bundle having the fiber ends opposite said light emitting diode arranged in a circle between said film and said focusing means, directing light toward said film.
Claim 7
Dependent Claim
25 words
The camera recited in claim 1 wherein said means for subjecting said film to said source of non-image light comprises shutter means within said camera.
Claim 8
Dependent Claim
48 words
The camera recited in claim 1 and further comprising means for controlling the duration of non-image light exposure to said film independently of the means for exposing said film to said image light, providing that said film is exposed to said image light and said non-image light simultaneously.
Claim 9
Dependent Claim
37 words
The camera recited in claim 1 wherein said means for subjecting said film to light comprises a first shutter for exposing said film to image light and a second shutter for exposing said film to non-image light.
Claim 10
Dependent Claim
29 words
The camera recited in claim 8 wherein said first shutter is located within said lens assembly and said second shutter is located between said light source and said film.
Claim 11
Dependent Claim
20 words
The camera recited in claim 1 wherein said means for subjecting said film to light comprises a focal plane shutter.
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) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |