US3780631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monochromatic photographic exposure process and apparatus
Assignee: Individual
•
Filing: 1972-06-23
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Granted: 1973-12-25
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Expires: 1992-06-23
Abstract
Abstract A process of filtering out from natural light that light of wave lengths greater than about 4800 angstroms and less than about 4500 angstroms, directing the filtered light of about 4500 to about 4800 angstroms onto a photosensitive cell and metering the response of the photosensitive cell and directly proportional to the metered response, controlling light exposure to an imagereceiving mechanism such as a television-image-receiving tube or a camera film, typically by controlling shutter speed and/or by controlling iris-aperture diameter of the camera, and the controlling of the light exposure may be either calculated on the basis of a meter reading or may be automatic through electrical circuits, whereby compensation is made for variations in spectral quantity of light source as well as compensation being thereby made for various reflectiveness of subject matter being metered.
Inventors
- 👤 N Schulman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:27
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/42; G01J1/4209; G01J1/4214
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
121 words
A process for color photography comprising in combination: passing exposure light of broad spectrum along a first path through a predetermined light filter means which screens out light having wavelengths less than and greater than a range between about 4300 angstroms and about 5000 angstroms, directing filtered light therefrom into a photosensitive cell responsive to said range, registering the output of said cell, passing said exposure light of broad spectrum along a second path different than said first path, exposing a color sensitive photographic film with light following said second path, and regulating in direct proportion the exposure of the photographic film dependent upon the registered output of said cell, said broad spectrum including light of wavelengths outside of said range.
Claim 2
Dependent Claim
121 words
A process for color photography comprising in combination: passing exposure light of broad spectrum along a first path through a predetermined light filter means which screens out light having wavelengths less than and greater than a range between about 4300 angstroms and about 5000 angstroms, directing filtered light therefrom into a photosensitive cell responsive to said range, registering the output of said cell, passing said exposure light of broad spectrum along a second path different than said first path, exposing a color sensitive photographic film with light following said second path, and regulating in direct proportion the exposure of the photographic film dependent upon the registered output of said cell, said broad spectrum including light of wavelengths outside of said range.
Claim 3
Dependent Claim
34 words
The process of claim 1 in which said filtered light has wavelengths rangings from about 4500 angstroms to about 4800 angstroms and in which said regulating comprises automatically controlling shutter speed of the camera.
Claim 4
Dependent Claim
34 words
A process of claim 1, in which said filtered light has wavelengths rangings from about 4500 angstroms to about 4800 angstroms and in which said regulating comprises automatically regulating iris diameter of a camera.
Claim 5
Dependent Claim
62 words
A photometer apparatus according to claim 1, in which said predetermined light filter means filters-out light having wavelengths below about 4500 angstroms and above about 4800 angstroms and transmits therethrough filtered light from 4500 angstroms to 4800 angstroms, and in which said filter means further includes a meter means with an indicator and operatively connected to indicate the output of said cell.
Claim 6
Dependent Claim
45 words
A photometer apparatus according to claim 1, in which said exposure includes a timer mechanism which decreases exposure time as intensity of light passed through said predetermined light filter increases and increases exposure time as intensity of light passed through said predetermined light filter decreases.
Claim 7
Dependent Claim
141 words
A color-photography photomer apparatus comprising in combination: a predetermined light filter means mounted to receive light of a broad spectrum and to screen-out light having wavelengths less than and more than a range between about 4300 angstroms and about 5000 angstroms and to pass light of a spectrum within said range, said light filter means including a photosensitive cell positioned to receive said filtered light and to be excluded from non-filtered broad spectrum light, said cell having an output proportional to the intensity of said filtered light received by said cell, exposure means for directing said broad spectrum light including light of wavelengths outside of said range to a color sensitive photographic film for exposing said film, said output from said cell being related to the proper exposure of said film to produce proper color rendition of said broad spectrum light.
Claim 8
Dependent Claim
141 words
A color-photography photomer apparatus comprising in combination: a predetermined light filter means mounted to receive light of a broad spectrum and to screen-out light having wavelengths less than and more than a range between about 4300 angstroms and about 5000 angstroms and to pass light of a spectrum within said range, said light filter means including a photosensitive cell positioned to receive said filtered light and to be excluded from non-filtered broad spectrum light, said cell having an output proportional to the intensity of said filtered light received by said cell, exposure means for directing said broad spectrum light including light of wavelengths outside of said range to a color sensitive photographic film for exposing said film, said output from said cell being related to the proper exposure of said film to produce proper color rendition of said broad spectrum light.
Claim 9
Dependent Claim
30 words
A photometer apparatus according to claim 6, in which said exposure means includes an adjustable iris-aperture operatively connected to said cell, exposure-size of said aperture being responsive to said output.
References Cited (Backward Citations)
US3554633A
Cited
US3648580A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |