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US5003500A
Expired / Lapsed
US
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Process and apparatus for the preparation of color formulations utilizing polarized light in spectrophotometry
Assignee: Novartis Corp
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Filing: 1989-08-24
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Granted: 1991-03-26
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Expires: 2009-08-24
Abstract
Abstract A process and an apparatus for the preparation of color formula for the reproduction of the color of a master are described. In the process, during a measurement, the gloss component of the reflected light is already suppressed with polarizing filters, so that the calculation of the colorant concentrations may be carried out independently of the surface conditions of the master to be reproduced (glossy, semigloss, matte) with a set of optical data of the colorants that are independent of surface conditions.
Inventors
- 👤 Werner H. Gerber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:08
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/02; B; B01; B01F; B01F33/00; B01F33/80; B01F33/84; B01F33/844; B01F33/8442; G01J3/0205; G01J3/0218; G01J3/0224; G01J3/46; G01J3/463; G01J3/50; G01J3/502; G01N; G01N21/00; G01N21/17; G01N21/47; G01N21/4738; G01N21/474; B01F2101/00; B01F2101/30; G01N2021/4742; G01N2021/4752; G01N2021/4757
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
191 words
A process for the preparation of color formula for the reproduction of the color of a master by the mixing of suitable concentrations of colorants, in particular colorings and pigments, said process comprising the steps of: exposing a master or a sample by a source of directional measuring light, the measuring light being polarized in a first polarizer prior to impacting the master or sample, respectively; passing light directionally reflected by the master or sample to a detector, said reflected light being passed through a second polarizer serving as an analyzer prior to its spectral decomposition by a wavelength dispersing element; producing spectral measuring data from said reflected light; converting said spectral measuring data in a computer unit into concentrations of colorants having known optical data previously calculated by spectro-photometric analysis via calibrated colorations using known standard colorant concentrations, and using optical data of the colorants independent of surface conditions; comparing a sample adjusted in accordance with the converted colorant concentrations calculated spectrophotometrically with the master; correcting the colorant concentrations in keeping with differences measured; repeating the correction process until the difference measured is less than a predetermined minimum color deviation.
Claim 2
Dependent Claim
191 words
A process for the preparation of color formula for the reproduction of the color of a master by the mixing of suitable concentrations of colorants, in particular colorings and pigments, said process comprising the steps of: exposing a master or a sample by a source of directional measuring light, the measuring light being polarized in a first polarizer prior to impacting the master or sample, respectively; passing light directionally reflected by the master or sample to a detector, said reflected light being passed through a second polarizer serving as an analyzer prior to its spectral decomposition by a wavelength dispersing element; producing spectral measuring data from said reflected light; converting said spectral measuring data in a computer unit into concentrations of colorants having known optical data previously calculated by spectro-photometric analysis via calibrated colorations using known standard colorant concentrations, and using optical data of the colorants independent of surface conditions; comparing a sample adjusted in accordance with the converted colorant concentrations calculated spectrophotometrically with the master; correcting the colorant concentrations in keeping with differences measured; repeating the correction process until the difference measured is less than a predetermined minimum color deviation.
Claim 3
Dependent Claim
37 words
The process according to claim 1, further comprising the step of determining the optical data of the colorants from measured data obtained from a spectrophotometric analysis of the colorants with polarized measuring light and polarized reflected light.
Claim 4
Dependent Claim
47 words
The process according to claim 2, wherein the measuring light is incident at an angle of 0°±10° relative to a normal onto the sample, and the reflected light is detected at an angle of 45°±5° relative to the normal of the sample and passed to the detector.
Claim 5
Dependent Claim
46 words
Process according to claim 2, wherein the measuring light is incident at an angle of 45°±10° relative to a normal onto the sample, and the light reflected is detected at an angle of 0°±10° relative to the normal of the sample and passed to the detector.
Claim 6
Dependent Claim
47 words
The process according to claim 1, wherein the measuring light is incident at an angle of 0°±10° relative to a normal onto the sample, and the reflected light is detected at an angle of 45°±5° relative to the normal of the sample and passed to the detector.
Claim 7
Dependent Claim
46 words
Process according to claim 1, wherein the measuring light is incident at an angle of 45°±10° relative to a normal onto the sample, and the light reflected is detected at an angle of 0°±10° relative to the normal of the sample and passed to the detector.
Claim 8
Independent Claim
105 words
An apparatus for the preparation of color formula for the reproduction of the color of a master by the mixing of suitable concentrations of colorants, in particular colorings and pigments, said apparatus comprising: a computer unit; a display; a memory unit; a spectrophotometer, said spectrophotometer being equipped with a first and a second polarizer, said first polarizer being located in a measuring beam path in front of a sample and the second polarizer being located in a beam path of reflected light in front of a wavelenth dispersing element; and, means for coupling said spectrophotometer with said computer unit, said display and said memory unit.
Claim 9
Independent Claim
105 words
An apparatus for the preparation of color formula for the reproduction of the color of a master by the mixing of suitable concentrations of colorants, in particular colorings and pigments, said apparatus comprising: a computer unit; a display; a memory unit; a spectrophotometer, said spectrophotometer being equipped with a first and a second polarizer, said first polarizer being located in a measuring beam path in front of a sample and the second polarizer being located in a beam path of reflected light in front of a wavelenth dispersing element; and, means for coupling said spectrophotometer with said computer unit, said display and said memory unit.
Claim 10
Dependent Claim
15 words
The apparatus according to claim 7, wherein said means for coupling is a serial interface.
Claim 11
Dependent Claim
12 words
The apparatus according to claim 7, wherein said sample is a master.
Claim 12
Dependent Claim
13 words
The apparatus according to claim 7, wherein said sample is an adjusted sample.
References Cited (Backward Citations)
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| 3.5 Years (Year 4) | 1994-03-25 | 1994-09-24 | 1995-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-25 | 1998-09-24 | 1999-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-25 | 2002-09-24 | 2003-03-26 | $7700.00 | Window Closed / Lapsed |