Patent US3924121A successfully refreshed from Google Patents.
US3924121A
Expired / Lapsed
US
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Process and apparatus for undercompensating photographic color printing
Assignee: Durst Group AG
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Filing: 1974-01-21
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Granted: 1975-12-02
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Expires: 1994-01-21
Abstract
Abstract Undercompensated photographic color printing is accomplished in a light integrating system by impinging substantially white light in which the ratio of the primary color components is predetermined, independent of the color content of any particular transparency, onto the measuring head which controls the termination of the exposures to each of the primary color components in the printing light. Servo control and charge storing circuits control the color content and intensity of the supplemental light. The ratio of printing and supplemental light impinged on the measuring head is adjusted by variable interposition of neutral gray wedges in the path of the emitted printing and supplemental light.
Inventors
- 👤 Siegfried Barbieri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:44
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/72; G03B27/73
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
163 words
A process for undercompensating the color balance obtained in making colored prints from colored photographic transparencies by a photographic color printing apparatus having a measuring head which terminates the exposures of the printing material to the light of the primary color components in the printing light when predetermined amounts of the printing light of the primary color components transmitted through the transparency are detected by the measuring head, comprising the steps of transmitting the printing light through the transparency onto the measuring head, and impinging supplemental light outside of the printing light on the measuring head together with the printing light transmitted through the transparency, and the supplemental light having primary color components in a predetermined ratio which is independent of the color content of any particular transparency, whereby the balance of the primary color components in the colored prints is undercompensated relative to the predetermined amounts of the primary color components in the printing light which are detected by the measuring head.
Claim 2
Dependent Claim
163 words
A process for undercompensating the color balance obtained in making colored prints from colored photographic transparencies by a photographic color printing apparatus having a measuring head which terminates the exposures of the printing material to the light of the primary color components in the printing light when predetermined amounts of the printing light of the primary color components transmitted through the transparency are detected by the measuring head, comprising the steps of transmitting the printing light through the transparency onto the measuring head, and impinging supplemental light outside of the printing light on the measuring head together with the printing light transmitted through the transparency, and the supplemental light having primary color components in a predetermined ratio which is independent of the color content of any particular transparency, whereby the balance of the primary color components in the colored prints is undercompensated relative to the predetermined amounts of the primary color components in the printing light which are detected by the measuring head.
Claim 3
Dependent Claim
33 words
A process as set forth in claim 1, wherein the ratio of the amounts of printing light and supplemental light impinged on the measuring head is varied for adjusting the degree of undercompensation.
Claim 4
Dependent Claim
26 words
A process as set forth in claim 1, wherein the intensity of the supplemental light is varied in accordance with the intensity of the printing light.
Claim 5
Dependent Claim
27 words
A process as set forth in claim 3, wherein the intensity of the supplemental light is varied in positive relationship to the intensity of the printing light.
Claim 6
Dependent Claim
31 words
A process as set forth in claim 1, wherein the primary color components in the supplemental light are mixed to form substantially white light before impinging them on the measuring head.
Claim 7
Dependent Claim
26 words
A process as set forth in claim 1, wherein the predetermined ratio of primary color components in the supplemental light is variable for adjusting the undercompensation.
Claim 8
Independent Claim
153 words
An apparatus for making undercompensated colored prints, from colored photographic transparencies, having a measuring head which terminates exposure of the printing material to the light of the primary color components in the printing light when predetermined amounts of the printing light of the primary color components transmitted through the transparencies are detected by the measuring head comprising means for transmitting the printing light through the transparency from which the prints are being made onto the measuring head, a source of supplemental light having primary color components in a predetermined ratio, and directing means connected with the source of supplemental light for impinging the supplemental light on the measuring head together with the printing light transmitted through the transparency whereby the balance of the primary color components in the colored prints is undercompensated relative to the predetermined amounts of the primary color components in the printing light which are detected by the measuring head.
Claim 9
Independent Claim
153 words
An apparatus for making undercompensated colored prints, from colored photographic transparencies, having a measuring head which terminates exposure of the printing material to the light of the primary color components in the printing light when predetermined amounts of the printing light of the primary color components transmitted through the transparencies are detected by the measuring head comprising means for transmitting the printing light through the transparency from which the prints are being made onto the measuring head, a source of supplemental light having primary color components in a predetermined ratio, and directing means connected with the source of supplemental light for impinging the supplemental light on the measuring head together with the printing light transmitted through the transparency whereby the balance of the primary color components in the colored prints is undercompensated relative to the predetermined amounts of the primary color components in the printing light which are detected by the measuring head.
Claim 10
Dependent Claim
67 words
An apparatus as set forth in claim 7, wherein printing and supplemental light conducting means impinge the printing light and supplemental light on the measuring head, and a ratio adjusting means is interposed between the light conducting means and the measuring head whereby the ratio of the amounts of printing light and supplemental light impinged on the measuring head is varied for adjusting the degree of undercompensation.
Claim 11
Dependent Claim
20 words
An apparatus as set forth in claim 8, wherein the ratio adjusting means comprises a pair of neutral density wedges.
Claim 12
Dependent Claim
45 words
An apparatus as set forth in claim 9, wherein the pair of neutral density wedges are disposed in opposed relationship whereby movement in one direction performs the variation of the ratio of the amounts of printing light and supplemental light impinged on the measuring head.
Claim 13
Dependent Claim
20 words
An apparatus as set forth in claim 8, wherein the light conducting means comprises a rod of light conducting material.
Claim 14
Dependent Claim
66 words
An apparatus as set forth in claim 7, wherein a photosensitive detecting means is disposed in the path of the printing light passing through the transparency, and light intensity controlling means is connected between the light intensity detecting means and the source of supplemental light whereby the intensity of the source of supplemental light is adjusted in accordance with the printing light transmitted through the transparency.
Claim 15
Dependent Claim
48 words
An apparatus as set forth in claim 12, wherein the source of supplemental light is connected to a source of power, the light intensity controlling means comprises a servo control circuit connecting the source of supplemental light to the photosensitive detecting means and to the source of power.
Claim 16
Independent Claim
280 words
An apparatus for making undercompensated colored prints, from colored photographic transparencies, having a measuring head which terminates exposure of the printing material to the light of the primary color components in the printing light when predetermined amounts of the printing light of the primary color components transmitted through the transparencies are detected by the measuring head comprising a source of supplemental light having primary color components in a predetermined ratio, directing means connected with the source of supplemental light for impinging the supplemental light on the measuring head whereby the balance of the primary color components in the colored prints is undercompensated relative to the predetermined amounts of the primary color components in the printing light which are detected by the measuring head, a photosensitive detecting means is disposed in the path of the printing light passing through the transparency, light intensity controlling means is connected between the light intensity detecting means and the source of supplemental light whereby the intensity of the source of supplemental light is adjusted in accordance with the printing light transmitted through the transparency, the source of supplemental light is connected to a source of power, the light intensity controlling means comprises a servo control circuit connecting the source of supplemental light to the photosensitive detecting means and to the source of power, an auxiliary photosensitive element is disposed in the path of the supplemental light, the servo control circuit comprises a differential amplifier means having a pair of connections, one of the connections being connected to the photosensitive detecting means, and the other of the connections being connected to the auxiliary photosensitive element whereby the intensity of the source of supplemental light is controlled.
Claim 17
Independent Claim
280 words
An apparatus for making undercompensated colored prints, from colored photographic transparencies, having a measuring head which terminates exposure of the printing material to the light of the primary color components in the printing light when predetermined amounts of the printing light of the primary color components transmitted through the transparencies are detected by the measuring head comprising a source of supplemental light having primary color components in a predetermined ratio, directing means connected with the source of supplemental light for impinging the supplemental light on the measuring head whereby the balance of the primary color components in the colored prints is undercompensated relative to the predetermined amounts of the primary color components in the printing light which are detected by the measuring head, a photosensitive detecting means is disposed in the path of the printing light passing through the transparency, light intensity controlling means is connected between the light intensity detecting means and the source of supplemental light whereby the intensity of the source of supplemental light is adjusted in accordance with the printing light transmitted through the transparency, the source of supplemental light is connected to a source of power, the light intensity controlling means comprises a servo control circuit connecting the source of supplemental light to the photosensitive detecting means and to the source of power, an auxiliary photosensitive element is disposed in the path of the supplemental light, the servo control circuit comprises a differential amplifier means having a pair of connections, one of the connections being connected to the photosensitive detecting means, and the other of the connections being connected to the auxiliary photosensitive element whereby the intensity of the source of supplemental light is controlled.
Claim 18
Dependent Claim
28 words
An apparatus As set forth in claim 14, wherein a potentiometer is connected to the servo control circuit for controlling the intensity of the supplemental source of light.
Claim 19
Dependent Claim
71 words
An apparatus as set forth in claim 14, wherein separate sources of supplemental light and separate auxiliary photosensitive elements are provided for the primary light components in the supplemental light, and color filters are disposed between each of the separate sources and the measuring head and the auxiliary photosensitive elements whereby the light of the primary color components is emitted upon the measuring head and each of the auxiliary photosensitive elements.
Claim 20
Dependent Claim
45 words
An apparatus as set forth in claim 16, wherein light mixing means is provided between the color filters associated with the separate sources of supplemental light and the measuring head whereby primary color components are mixed to provide substantially white light to the measuring head.
Claim 21
Dependent Claim
32 words
An apparatus as set forth in claim 17, wherein the servo control circuit has separate servo feedback control circuits with differential amplifier means for each of the separate source of supplemental light.
Claim 22
Dependent Claim
34 words
An apparatus as set forth in claim 18, wherein a potentiometer is connected to each of the separate servo control circuits for controlling the intensity of each of the separate supplemental sources of light.
Claim 23
Dependent Claim
36 words
An apparatus as set forth in claim 19, wherein another potentiometer is connected between the photosensitive detecting means and the separate sources of supplemental light for adjusting the overall intensity of the sources of supplemental light.
Claim 24
Dependent Claim
44 words
An apparatus as set forth in claim 20, wherein the light intensity controlling means also includes a capacitor circuit connected to the photosensitive connecting means for storing a potential which helps govern the overall intensity of light emitted by the separate sources of light.
Claim 25
Dependent Claim
28 words
An apparatus as set forth in claim 21, wherein a rectifier is connected to the capacitor circuit to prevent it from discharging until after the exposures are terminated.
Claim 26
Dependent Claim
26 words
An apparatus as set forth in claim 21, wherein a discharge switch is provided in the capacitor circuit to discharge it after the exposures are terminated.
Claim 27
Dependent Claim
42 words
An apparatus as set forth in claim 14, wherein the light intensity controlling means comprises a capacitor circuit connected to the photosensitive detecting means for storing a potential which helps govern the intensity of light emitted by the source of supplemental light.
Claim 28
Dependent Claim
28 words
An apparatus as set forth in claim 24, wherein a rectifier is connected to the capacitor circuit to prevent it from discharging until after the exposures are terminated.
Claim 29
Dependent Claim
26 words
An apparatus as set forth in claim 25, wherein a discharge switch is provided in the capacitor circuit to discharge it after the exposures are terminated.
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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) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |