Patent FR2403484A1 successfully refreshed from Google Patents.
US3897147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lamphouse assembly for photographic printers and enlargers
Assignee: Individual
•
Filing: 1974-03-20
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Granted: 1975-07-29
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Expires: 1994-03-20
Abstract
Abstract In a lamphouse assembly, two sets of three filtered high intensity lamps direct red, green and blue light toward either half of a roof-shaped translucent top of an optical mixing chamber. The vertical sides of the mixing chamber have a reflecting, diffusing coating and the bottom is formed by a final diffusing plate below which a photographic negative is held. Thoroughly mixed, soft white light is evenly distributed over the negative at high intensity via the final diffusing plate. Each trio of lamps is mounted at the correct position relative to the mixing chamber by means of a unitary angled bracket secured to an inspection cover plate facilitating access to each lamp assembly.
Inventors
- 👤 Murray H Simon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:18
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/54; G03B27/545; G03B27/547
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
149 words
A lamphouse assembly for photographic printers and enlargers, comprising first illuminating means for directing light energy in a plurality of different colors, second illuminating means for directing light energy in a plurality of different colors, a closed light mixing chamber having a roof-shaped upper portion formed by two translucent roof panels joined at an angle, a plurality of side portions each having a reflective diffusing interior surface and a bottom portion directly below said upper portion formed by a translucent diffusing plate, first mounting means for aiming said first illuminating means at one of said translucent roof panels and second mounting means for aiming said second illuminating means at the other translucent roof panel, whereby said colors of light are diffused through said translucent roof panels, blended by reflection and diffusion within said mixing chamber and further diffused through said bottom diffusing plate to provide evenly distributed, mixed light.
Claim 2
Dependent Claim
149 words
A lamphouse assembly for photographic printers and enlargers, comprising first illuminating means for directing light energy in a plurality of different colors, second illuminating means for directing light energy in a plurality of different colors, a closed light mixing chamber having a roof-shaped upper portion formed by two translucent roof panels joined at an angle, a plurality of side portions each having a reflective diffusing interior surface and a bottom portion directly below said upper portion formed by a translucent diffusing plate, first mounting means for aiming said first illuminating means at one of said translucent roof panels and second mounting means for aiming said second illuminating means at the other translucent roof panel, whereby said colors of light are diffused through said translucent roof panels, blended by reflection and diffusion within said mixing chamber and further diffused through said bottom diffusing plate to provide evenly distributed, mixed light.
Claim 3
Dependent Claim
68 words
The assembly of claim 1, wherein said first and second illuminating means each include a plurality of individual light sources providing light energy having different primary colors within each illuminating means, said first and second mounting means each including a unitary mounting bracket for aligning the optical axis of each individual light source at a predetermined angle and point of incidence with respect to the corresponding roof panel.
Claim 4
Dependent Claim
103 words
The assembly of claim 2, further comprising an apertured housing forming an enclosure for said mixing chamber and said first and second illuminating means, said mixing chamber being mounted such that mixed light is passed from said final diffusing plate out through a first aperture in said housing, said housing further including a pair of detachable inspection cover plates removably secured to adjacent portions of said housing each surrounding additional respective apertures, each said unitary mounting bracket being affixed to the inside of a corresponding one of said cover plates, whereby replacement of each said cover plate automatically aligns said individual light sources.
Claim 5
Dependent Claim
52 words
The assembly of claim 3, wherein said cover plates have respective exhaust hose fittings, said housing further including a pair of shielded, air inlet ports correspondingly arranged with respect to said exhaust hose fittings such that said respective illuminating means are approximately interposed between corresponding pairs of inlet ports and exhaust fittings.
Claim 6
Dependent Claim
67 words
The assembly of claim 2, wherein said first and second illuminating means each include three individual light sources respectively providing said primary colors, said first and second mounting means each positioning said three light sources side by side in an angled cluster such that the optical axis of the middle light source of each illuminating means intersects the corresponding roof panel approximately orthogonally at the center thereof.
Claim 7
Dependent Claim
52 words
The assembly of claim 5, further comprising a control module affixed to the outside of said housing having manually adjustable means for separately varying the intensity of corresponding pairs of said individual light sources and switch means for separately disconnecting said corresponding pairs of light sources from a source of electrical power.
Claim 8
Dependent Claim
66 words
The assembly of claim 5, wherein the other two light sources of each illuminating means are positioned such that the optical axes of all three light sources of each illuminating means define a plane approximately orthogonal to the plane of the corresponding roof panel and intersecting therewith in a line approximately parallEl to the intersection of said roof panels and approximately bisecting said corresponding roof panel.
Claim 9
Dependent Claim
33 words
The assembly of claim 7, wherein the optical axes of the six individual light sources in said two illuminating means intersect approximately in a point in the interior of said light mixing chamber.
Claim 10
Dependent Claim
23 words
The assembly of claim 7, wherein said optical axes of the six individual light sources all pass obliquely through said final diffusing plate.
Claim 11
Dependent Claim
17 words
The assembly of claim 2, wherein the angle of intersection of said roof panels is about 90*.
Claim 12
Dependent Claim
22 words
The assembly of claim 10, wherein said side portions of said mixing chamber are upright with respect to said bottom diffusing plate.
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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) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |