Patent US4143966A successfully refreshed from Google Patents.
US4143966A
Expired / Lapsed
US
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Illumination device for photographic color apparatus
Assignee: Durst Group AG
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Filing: 1978-01-30
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Granted: 1979-03-13
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Expires: 1998-01-30
Abstract
Abstract An illuminating device for a color printing apparatus having color filters insertable at varying amounts into the printing light beam has a light-conducting shaft and a variable aperture diaphragm both of which have substantially rectangular cross sections whereby the color content of the printing light beam is maintained substantially uniform. The light-conducting shaft has the form of a frustum of a square pyramid and the variable aperture of the diaphragm has a rectangular form. The light source has an ellipsoidal reflector, and the light beam emerging from the illuminating device is channeled through a light mixer.
Inventors
- 👤 Mario Gandini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:15
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/54; G03B27/545; G03B27/547
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
111 words
An illuminating device for a photographic color printing apparatus having color filters insertable at variable amounts into a beam of printing light to adjust its color content comprising a source of the beam of printing light, a variable aperture diaphragm disposed adjacent the color filters in the path of the printing beam for controlling the intensity of light emerging from the device, a light-conducting shaft disposed between the source and the diaphragm, and the cross sections of the light-conducting shaft and the diaphragm aperture being coordinated with each other to maintain a substantially uniform color content in the printing light beam over the entire range of variation of the diaphragm aperture.
Claim 2
Dependent Claim
111 words
An illuminating device for a photographic color printing apparatus having color filters insertable at variable amounts into a beam of printing light to adjust its color content comprising a source of the beam of printing light, a variable aperture diaphragm disposed adjacent the color filters in the path of the printing beam for controlling the intensity of light emerging from the device, a light-conducting shaft disposed between the source and the diaphragm, and the cross sections of the light-conducting shaft and the diaphragm aperture being coordinated with each other to maintain a substantially uniform color content in the printing light beam over the entire range of variation of the diaphragm aperture.
Claim 3
Dependent Claim
22 words
An illuminating device as set forth in claim 1, wherein the cross sections of the diaphragm and light-conducting shaft are substantially rectangular.
Claim 4
Dependent Claim
31 words
An illuminating device as set forth in claim 2, wherein the cross section of the light-conducting shaft is substantially square and the cross section of the diaphragm aperture is substantially rectangular.
Claim 5
Dependent Claim
47 words
An illuminating device as set forth in claim 3, wherein the diaphragm comprises a pair of plates having substantially straight parallel adjacent edges having coordinated movements toward and away from each other in the path of the printing light beam whereby the variable rectangular aperture is provided.
Claim 6
Dependent Claim
60 words
An illuminating device as set forth in claim 1, wherein the color filters have a first direction of movement into and out of the light beam, the diaphragm having movable plates which are movable in a second direction into and out of the printing light beam, and the first and second directions of movement being angularly spaced from each other.
Claim 7
Dependent Claim
24 words
An illuminating device as set forth in claim 5, wherein the first and second directions of movement are spaced substantially perpendicularly to each other.
Claim 8
Dependent Claim
26 words
An illuminating device as set forth in claim 6, wherein the cross sections of the light-conducting shaft and the aperture of the diaphragm are substantially rectangular.
Claim 9
Dependent Claim
50 words
An illuminating device as set forth in claim 1, wherein the light-conducting shaft has the form of a frustum of a pyramid, and the light-conducting shaft tapers inwardly from the source to the diaphragm whereby the diaphragm is disposed substantially in the most constricted portion of the printing light beam.
Claim 10
Dependent Claim
19 words
An illuminating device as set forth in claim 8, wherein the light-conducting shaft has a substantially rectangular cross section.
Claim 11
Dependent Claim
19 words
An illuminating device as set forth in claim 9, wherein the light-conducting shaft has a substantially square cross section.
Claim 12
Dependent Claim
22 words
An illuminating device as set forth in claim 1, wherein the diaphragm is disposed between the light-conducting shaft and the color filters.
Claim 13
Dependent Claim
28 words
An illuminating device as set forth in claim 1, wherein a light mixing shaft is disposed in the path of the printing light beam emerging from the device.
Claim 14
Dependent Claim
17 words
An illuminating device as set forth in claim 1, wherein the light source incorporates an ellipsoidal reflector.
Claim 15
Dependent Claim
18 words
An illuminating device as set forth in claim 1, wherein the color filters have a relatively high density.
Claim 16
Dependent Claim
18 words
An illuminating device as set forth in claim 1, wherein the color filters have an extremely high density.
References Cited (Backward Citations)
US3217594A
Cited
US3273451A
Cited
US3709601A
Cited
US3800070A
Cited
US3684371A
Cited
US3829210A
Cited
US3756719A
Cited
US3831021A
Cited
US4050807A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-12 | 1982-09-11 | 1983-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-12 | 1986-09-11 | 1987-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-12 | 1990-09-11 | 1991-03-13 | $7700.00 | Window Closed / Lapsed |