Patent US4610538A successfully refreshed from Google Patents.
US4610538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color compensation method in photographic printer
Assignee: Fujifilm Holdings Corp
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Filing: 1985-04-16
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Granted: 1986-09-09
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Expires: 2005-04-16
Abstract
Abstract It is necessary to optimally control exposure conditions in printers and development conditions for negative films and photographic paper in order to achieve color printing of high quality. According to the method of this invention, as the luminance voltage of a light source and color compensation filters for respective colors are controlled automatically and the voltage to be applied to the light source can be minimized to avoid a waste of light. Even if there is insufficient light at the light source due to the deterioration of the light source or the fluctuations in a power source voltage, this method enables one increase the amount of light by increasing the voltage to be applied to the light source.
Inventors
- 👤 Yuji Takenaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:16
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/72; G03B27/73; G03B27/735
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
91 words
A color compensation method for color printers using CMY-color compensation filters arranged in a light path of a light source for photographic printing, comprising: positioning a color compensation filter which is selected from said CMY-color compensation filters and has the smallest compensation value at a predetermined position with respect to said light path, and adjusting the amount of light from the light source to a target value set for the positioned filter, and inserting the other two color compensation filters within said light path for color compensation at said target value.
Claim 2
Dependent Claim
91 words
A color compensation method for color printers using CMY-color compensation filters arranged in a light path of a light source for photographic printing, comprising: positioning a color compensation filter which is selected from said CMY-color compensation filters and has the smallest compensation value at a predetermined position with respect to said light path, and adjusting the amount of light from the light source to a target value set for the positioned filter, and inserting the other two color compensation filters within said light path for color compensation at said target value.
Claim 3
Dependent Claim
22 words
A method as claimed in claim 1, wherein said predetermined position is a position contacting or just outside of said light path.
Claim 4
Dependent Claim
19 words
A method as claimed in claim 1, wherein said predetermined position is a position slightly within said light path.
Claim 5
Dependent Claim
37 words
A method as claimed in claim 1, wherein the color compensation filter, is selected from said CMY-color compensation filters and having the largest opening, is used to attenuate the light from said light source without being moved.
Claim 6
Dependent Claim
43 words
A method as claimed in claim 1, wherein if the target amount of light is not obtained even if one of said CMY-color compensation filters is placed outside of said light path, then the amount of light from the light source is increased.
Claim 7
Dependent Claim
118 words
A color compensation method for color printers using CMY-color compensation filters arranged in a light path of a light source for photographic printing comprising: adjusting the exposure conditions for differences caused by the different types of color negative films by positioning a color compensation filter which is selected from said CMY-color compensation filters and has the smallest compensation value at a predetermined position with respect to the light path, and adjusting the amount of light from the light source to a target value for the positioned filter, and placing the other two color compensation filters within said light path, and adjusting the exposure conditions for the difference in respective individual frames of a film by using cut filters.
Claim 8
Dependent Claim
118 words
A color compensation method for color printers using CMY-color compensation filters arranged in a light path of a light source for photographic printing comprising: adjusting the exposure conditions for differences caused by the different types of color negative films by positioning a color compensation filter which is selected from said CMY-color compensation filters and has the smallest compensation value at a predetermined position with respect to the light path, and adjusting the amount of light from the light source to a target value for the positioned filter, and placing the other two color compensation filters within said light path, and adjusting the exposure conditions for the difference in respective individual frames of a film by using cut filters.
Claim 9
Dependent Claim
22 words
A method as claimed in claim 6, wherein said predetermined position is a position contacting or just outside of said light path.
Claim 10
Dependent Claim
19 words
A method as claimed in claim 6, wherein said predetermined position is a position slightly within said light path.
Claim 11
Dependent Claim
27 words
A method as claimed in claim 6, wherein the amount of light passing through said color compensation filters is adjusted by photographically measuring a reference negative film.
Claim 12
Dependent Claim
37 words
A method as claimed in claim 6, wherein the amount of light passing through said color compensation filters are adjusted by measuring the light source and the light which has been transmitted through said color compensation filters.
Claim 13
Dependent Claim
45 words
A method as claimed in claim 9, wherein said reference negative film is taken out of the measurement section after photometry, a negative film which is to be printed is mounted, and a frame of said negative film is measured for controlling said cut filters.
Claim 14
Dependent Claim
20 words
A method as claimed in claim 11, wherein said measurement is conducted between said negative film and a photographic paper.
Claim 15
Dependent Claim
31 words
A method as claimed in claim 10, wherein a frame of the negative film which is to be printed is measured photographically after said measurement for controlling of said cut filters.
Claim 16
Dependent Claim
42 words
A method as claimed in claim 13, wherein the measurement for said color compensation filters is conducted between said light source and the negative film and the measurement for said cut filters is conducted between said negative film and a photographic paper.
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) | 1989-09-08 | 1990-03-10 | 1990-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-08 | 1994-03-10 | 1994-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-08 | 1998-03-10 | 1998-09-09 | $7700.00 | Window Closed / Lapsed |