US3601021A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Camera exposure control
Assignee: Eastman Kodak Co
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Filing: 1968-07-22
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Granted: 1971-08-24
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Expires: 1988-07-22
Abstract
Abstract An exposure control system in a camera adapted to receive a film cartridge having tactile indicia representative of film speed and film type, including movable filters for varying the intensity and color balance of light incident on a photocell in the system in response to detected tactile indicia. The system also includes movable filters for varying the intensity and color balance of light transmitted through the objective of the camera in response to the detected film type indicia, and independent control means for removing the color balance filters away from the photocell and the objective.
Inventors
- 👤 Donald Oscar Easterly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:10
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/24; G03B17/00; G03B17/02; G03B17/12; G03B7/18
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
242 words
A camera adapted to receive a cartridge containing a strip of photographic film adapted to be exposed in an exposure plane and means for exposing the film strip to scene luminance when the film strip is positioned in such plane, said cartridge having tactile discontinuities thereon representative of film speed and film type respectively, said camera comprising: a. a housing; b. exposure control means for adjusting the means for exposing the film strip to provide proper exposure of the film for a specific range of scene luminances and film speeds, c. a photocell within said housing for regulating said exposure control means as a function of scene illumination, said photocell being electrically coupled to said exposure control means, said photocell having a given sensitivity; d. a first compensating filter movable into and out of optical alignment with said photocell so as to vary the effective sensitivity of said photocell in accordance with the film speed represented by one of said tactile discontinuities; e. a second compensating filter normally aligned with said photocell and movable from alignment with said photocell when film spectrally balanced for artificial illumination is to be utilized under artificial lighting conditions; and f. means, responsive to the film speed discontinuity on the cartridge, for positioning said second photocell compensating filter out of optical alignment with said photocell when said film speed discontinuity is representative of film of the maximum speed in said range accommodatable by said exposure control system.
Claim 2
Dependent Claim
242 words
A camera adapted to receive a cartridge containing a strip of photographic film adapted to be exposed in an exposure plane and means for exposing the film strip to scene luminance when the film strip is positioned in such plane, said cartridge having tactile discontinuities thereon representative of film speed and film type respectively, said camera comprising: a. a housing; b. exposure control means for adjusting the means for exposing the film strip to provide proper exposure of the film for a specific range of scene luminances and film speeds, c. a photocell within said housing for regulating said exposure control means as a function of scene illumination, said photocell being electrically coupled to said exposure control means, said photocell having a given sensitivity; d. a first compensating filter movable into and out of optical alignment with said photocell so as to vary the effective sensitivity of said photocell in accordance with the film speed represented by one of said tactile discontinuities; e. a second compensating filter normally aligned with said photocell and movable from alignment with said photocell when film spectrally balanced for artificial illumination is to be utilized under artificial lighting conditions; and f. means, responsive to the film speed discontinuity on the cartridge, for positioning said second photocell compensating filter out of optical alignment with said photocell when said film speed discontinuity is representative of film of the maximum speed in said range accommodatable by said exposure control system.
Claim 3
Dependent Claim
40 words
The invention in accordance with claim 1 wherein said positioning means comprises a filter mount having connected therewith a film speed discontinuity sensing member and first spring means for biasing said discontinuity sensing member toward said discontinuity for engagement therewith.
Claim 4
Dependent Claim
54 words
The invention in accordance with claim 2 wherein said film speed discontinuity sensing member comprises a feeler member of a size adapted to engage the discontinuity when the dimensions thereof represent film of the maximum speed accommodatable by the camera, whereby said second compensating filter is positionable out of optical alignment with said photocell.
Claim 5
Dependent Claim
19 words
The invention in accordance with claim 2 wherein said filter mount moving means comprises a substantially perpendicularly extending lug.
Claim 6
Dependent Claim
45 words
The invention in accordance with claim 2 wherein said filter mount is movably mounted on said camera housing and biased into optical alignment with said photocell when said film discontinuity sensing member senses other than film of maximum speed accommodatable by said exposure control system.
Claim 7
Dependent Claim
45 words
The invention in accordance with claim 5 wherein said filter mount has an arm extending therefrom and said filter holder moving means comprises a cam surface formed on said film speed discontinuity sensing meMber, said surface being arranged so as to interact with said arm.
Claim 8
Dependent Claim
161 words
An exposure control system in a camera adapted to receive a cartridge containing photographic film for exposing the film to scene illumination, said cartridge having tactile indicia representative of film speed and film type, said exposure control comprising: a. means including a photocell for adjusting an exposure parameter in accordance with the level of illumination incident on the photocell; b. a first optical filter selectively movable into alignment with said photocell to vary the color balance of light incident on the photocell; c. first sensing means for controlling the movement of said first filter in accordance with the tactile indicia on such a cartridge loaded in the camera; d. a second optical filter selectively movable into alignment with the objective lens on said camera to vary the color balance of light transmitted through the objective; and e. second sensing means for controlling the movement of said second filter in accordance with the tactile indicia on a cartridge loaded in the camera.
Claim 9
Dependent Claim
161 words
An exposure control system in a camera adapted to receive a cartridge containing photographic film for exposing the film to scene illumination, said cartridge having tactile indicia representative of film speed and film type, said exposure control comprising: a. means including a photocell for adjusting an exposure parameter in accordance with the level of illumination incident on the photocell; b. a first optical filter selectively movable into alignment with said photocell to vary the color balance of light incident on the photocell; c. first sensing means for controlling the movement of said first filter in accordance with the tactile indicia on such a cartridge loaded in the camera; d. a second optical filter selectively movable into alignment with the objective lens on said camera to vary the color balance of light transmitted through the objective; and e. second sensing means for controlling the movement of said second filter in accordance with the tactile indicia on a cartridge loaded in the camera.
Claim 10
Dependent Claim
40 words
The exposure control claimed in claims 7 further comprising independent control means for selectively moving said first and second filters out of alignment with said photocell and objective, respectively, regardless of the indicia on a cartridge loaded in the camera.
Claim 11
Dependent Claim
120 words
An exposure control system in a camera adapted to receive a cartridge containing photographic film for exposing the film to scene illumination, said cartridge having tactile indicia representative of film speed and film type, said exposure control comprising: a. means including a photocell for adjusting an exposure parameter in accordance with the level of illumination incident on the photocell b. first means for sensing said tactile indicia to determine the film speed indicated thereby; c. second means for sensing said tactile indicia for determining the film type indicated thereby; and d. means for coupling together said sensing means when said first sensing means detects that the film speed is the fastest for which the exposure control is designed to operate.
Claim 12
Dependent Claim
120 words
An exposure control system in a camera adapted to receive a cartridge containing photographic film for exposing the film to scene illumination, said cartridge having tactile indicia representative of film speed and film type, said exposure control comprising: a. means including a photocell for adjusting an exposure parameter in accordance with the level of illumination incident on the photocell b. first means for sensing said tactile indicia to determine the film speed indicated thereby; c. second means for sensing said tactile indicia for determining the film type indicated thereby; and d. means for coupling together said sensing means when said first sensing means detects that the film speed is the fastest for which the exposure control is designed to operate.
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) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |