US3698294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sensitometer apparatus
Assignee: Northrop Grumman Guidance and Electronics Co Inc
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Filing: 1968-04-01
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Granted: 1972-10-17
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Expires: 1988-04-01
Abstract
Abstract A sensitometer having a replaceable integral exposure source unit including both a constant source of actinic energy and an energy modulator. Because of the fixed relationship between its individual components, the modulated energy output remains at a known, constant level over the life of the exposure unit.
Inventors
- 👤 Lloyd C Sanford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:35
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/42
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
186 words
In a sensitometer which enables the determination of the response characteristics of a photosensitive medium to actinic radiation by exposing the photosensitive medium to actinic radiation, from an actinic energy source means, which has been modulated by a variable density energy modulation means, the improvement comprising: an exposure source unit including said actinic energy source means, said variable density energy modulation means, and means for providing a plurality of radiation paths from said actinic energy source means to said energy modulation means, said exposure source unit comprising a unitary, integrally-constructed unit for preventing said actinic energy source means or said energy modulation means from being replaced without the effective destruction of the exposure source unit, and including: a. means to irreplaceably secure said actinic energy source means to said integrally-constructed exposure source unit of said sensitometer for preventing the replacement of said actinic energy source means without breaking the exposure source unit; and b. means to irreplaceably secure said energy modulation means to said integrally-constructed exposure source unit of said sensitometer for preventing the replacement of said energy modulation means without breaking the exposure source unit.
Claim 2
Dependent Claim
186 words
In a sensitometer which enables the determination of the response characteristics of a photosensitive medium to actinic radiation by exposing the photosensitive medium to actinic radiation, from an actinic energy source means, which has been modulated by a variable density energy modulation means, the improvement comprising: an exposure source unit including said actinic energy source means, said variable density energy modulation means, and means for providing a plurality of radiation paths from said actinic energy source means to said energy modulation means, said exposure source unit comprising a unitary, integrally-constructed unit for preventing said actinic energy source means or said energy modulation means from being replaced without the effective destruction of the exposure source unit, and including: a. means to irreplaceably secure said actinic energy source means to said integrally-constructed exposure source unit of said sensitometer for preventing the replacement of said actinic energy source means without breaking the exposure source unit; and b. means to irreplaceably secure said energy modulation means to said integrally-constructed exposure source unit of said sensitometer for preventing the replacement of said energy modulation means without breaking the exposure source unit.
Claim 3
Dependent Claim
18 words
A sensitometer apparatus according to claim 1 wherein said actinic energy source means comprises an electric flash lamp.
Claim 4
Dependent Claim
27 words
A sensitometer apparatus according to claim 1 wherein said exposure source unit includes a block of actinic energy transmissive material potted around said actinic energy source means.
Claim 5
Dependent Claim
17 words
A sensitometer apparatus according to claim 1 wherein said energy modulation means comprises a photographic density weDge.
Claim 6
Dependent Claim
18 words
A sensitometer apparatus according to claim 4 wherein said actinic energy source means comprises an electric flash lamp.
Claim 7
Dependent Claim
25 words
A sensitometer apparatus according to claim 5 wherein said exposure source unit includes a rectangular block of light transmissive material potted around said flash lamp.
Claim 8
Dependent Claim
41 words
A sensitometer apparatus according to claim 6 wherein said density wedge is located along one elongated surface of said block and the remaining surfaces are polished, specular surfaces adapted to reflect light received from said flash lamp toward said density wedge.
Claim 9
Dependent Claim
25 words
A sensitometer apparatus according to claim 7 wherein said flash lamp is potted within said block adjacent an end surface thereof opposite said aperture portion.
Claim 10
Dependent Claim
19 words
A sensitometer according to claim 8 wherein said end surface of said block is coated with a reflective substance.
Claim 11
Dependent Claim
28 words
A sensitometer apparatus according to claim 1 wherein said exposure source unit includes a rectangular block of actinic energy transmissive material potted around said actinic energy source means.
Claim 12
Dependent Claim
44 words
A sensitometer apparatus according to claim 10 wherein said energy modulation means is located along one elongated surface of said block and the remaining surfaces are polished, specular surfaces adapted to reflect energy received from said energy source means toward said energy modulation means.
Claim 13
Dependent Claim
26 words
A sensitometer apparatus according to claim 11 wherein said energy source means is potted within said block adjacent an end surface thereof opposite said aperture portion.
Claim 14
Dependent Claim
19 words
A sensitometer according to claim 12 wherein said end surface of said block is coated with a reflective substance.
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) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |