US3572944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for analyzing color samples
Assignee: FILM EQUIPMENT Manufacturing CO
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Filing: 1969-02-24
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Granted: 1971-03-30
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Expires: 1989-02-24
Abstract
Abstract A system for analyzing color samples, such as film and filters, has a light-transmission box and a signal processor wherein a color sample to be analyzed is placed over an aperture through an illuminated translucent window in an upper surface of a transmission box. A lamp is mounted to direct a light beam through a plurality of infrared filters into an entrance of an integration bar having an exit aligned with the aperture through the translucent window thereby directing a diffused light beam through the color sample into a light-collecting member. A plurality of color-sensitive phototubes are each responsive to a chromatically differing component of the light directed through the color sample and are positioned to receive light from the light collecting member. The color-sensitive phototubes are operatively connected to the signal processor wherein computation means analyze the light received by the phototubes and display numerical density values.
Inventors
- 👤 John V Hanline
- 👤 Daniel M Chapin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:38
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/46; G01J3/50; G01J3/465
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
243 words
A system for analyzing a light-transmitting color sample, comprising: a. means for directing substantially infrared-free diffused light through a light-transmitting color sample; b. color-responsive sensing means for producing electrical signals in response to received light with the signals corresponding to spectral respOnse functions of the human eye for the primary colors of red and green and blue; c. means for receiving light directed through the lighttransmitting color sample and diffusing said received light and directing same onto said color-responsive sensing means; d. an amplification circuit for each of the primary colors of red and green and blue, said amplification circuits each being electrically connected to said color-responsive sensing means, said amplification circuits each having electrically connected signal distortion prevention means and signal standardization means and output amplification means; e. a computation circuit electrically connected to each of said amplification circuits and having a channel for each of the primary colors of red and green and blue, said computation circuit being operative to produce an amplified signal corresponding to each of the densities of the primary colors of red and green and blue present in the light-transmitting color sample; f. readout selector switching means electrically connected to said color-responsive sensing means and to each of said amplification circuits and to each channel of said computation circuit; and g. visual indicator means electrically connected to said readout selector switching means for displaying numerical density values for the primary colors of red and green and blue.
Claim 2
Independent Claim
243 words
A system for analyzing a light-transmitting color sample, comprising: a. means for directing substantially infrared-free diffused light through a light-transmitting color sample; b. color-responsive sensing means for producing electrical signals in response to received light with the signals corresponding to spectral respOnse functions of the human eye for the primary colors of red and green and blue; c. means for receiving light directed through the lighttransmitting color sample and diffusing said received light and directing same onto said color-responsive sensing means; d. an amplification circuit for each of the primary colors of red and green and blue, said amplification circuits each being electrically connected to said color-responsive sensing means, said amplification circuits each having electrically connected signal distortion prevention means and signal standardization means and output amplification means; e. a computation circuit electrically connected to each of said amplification circuits and having a channel for each of the primary colors of red and green and blue, said computation circuit being operative to produce an amplified signal corresponding to each of the densities of the primary colors of red and green and blue present in the light-transmitting color sample; f. readout selector switching means electrically connected to said color-responsive sensing means and to each of said amplification circuits and to each channel of said computation circuit; and g. visual indicator means electrically connected to said readout selector switching means for displaying numerical density values for the primary colors of red and green and blue.
Claim 3
Dependent Claim
184 words
A system for analyzing a light-transmitting color sample as set forth in claim 1 wherein said amplification circuits each include: a. an input network electrically connected to said color-responsive sensing means for the respective primary color and to said signal distortion prevention means, said input network being electrically connected to a source of electrical power and having electrical resistance means and circuit noise reduction means in the form of a filtering capacitor; b. an amplification completion loop electrically connected to each of said signal distortion prevention means and said signal standardization means and said output amplification means, said amplification completion loop connected to said output amplification means having a log converter with a potentiometer portion therein for providing a logarithmic conversion whereby said respective amplification circuit supplies electrical voltage corresponding to the density of the respective primary color present in the color sample; and c. an offset balancing potentiometer electrically connected to each of said signal distortion prevention means and said signal standardization means and said output amplification means, each of said offset balancing potentiometers being electrically connected to the source of electrical power.
Claim 4
Dependent Claim
181 words
A system for analyzing a light-transmitting color sample as set forth in claim 1 wherein said computation circuit includes: a. an operational amplifier in each of said red channel and green channel and blue channel, said operational amplifiers each being electrically connected to a source of electrical power and having electrical resistance means in said connection; b. an amplification completion loop electrically connected to said operational amplifier in each of said red and green and blue channels, said amplification completion loops each being electrically connected to an output of said respective amplification circuit and having first electrical resistance means in said connection and second electrical resistance means electrically connected to the amplification completion loop for said green channel and said blue channel, each of said amplification completion loops having electrical resistance means and circuit noise reduction means in the form of a filtering capacitor; and c. an offset balancing potentiometer electrically connected to said operational amplifier in each of said red and green and blue channels, each of said offset balancing potentiometers being electrically connected to the source of electrical power.
Claim 5
Dependent Claim
157 words
A system for analyzing a light-transmitting color sample as set Forth in claim 2 wherein said computation circuit includes: a. an operational amplifier in each of said red channel and green channel and blue channel, said operational amplifiers each having electrical connection with an output of said respective amplification circuit and having first electrical amplifiers each having electrical connection with a source of electrical power and having electrical resistance means in said connection; b. an offset balancing potentiometer electrically connected to said operational amplifier in each of said red and green and blue channels, each of said offset balancing potentiometers being electrically connected to the source of electrical power; and c. second electrical resistance means electrically connected to said operational amplifier in said green channel and said blue channel whereby said computation circuit is a subtractive circuit operative to provide output voltages corresponding to integral red density and integral net green density and integral net blue density.
Claim 6
Independent Claim
388 words
A system for analyzing a light-transmitting color sample, comprising: a. a transmission box having a first portion selectively movable toward and away from a second portion having an aperture in one surface thereof; b. means in said first portion for directing diffused light through said aperture and through a light-transmitting color sample placed over said aperture, said diffused light-directing means including a light source and means for permitting escape of infrared energy and reflecting the visible portion of the spectrum of light from the light source and directing said visible portion through a plurality of infrared rejection mirrors and into light-diffusing means having an exit alignable with said aperture; c. color-responsive sensing means for producing electrical signals in response to received light with the signals corresponding to spectral response functions of the human eye for the primary colors of red and green and blue; d. means within said second portion for receiving light directed through the light-transmitting color sample and through said aperture and for diffusing the received light and directing same onto said color responsive sensing means; e. signal processing means having a red channel and a green channel and a blue channel, each channel being electrically connected to said color-responsive sensing means and operative to produce an amplified signal corresponding to the density of a respective one of the primary colors of red and green and blue present in the light-transmitting color sample; f. readout selector switching means electrically connected to said color-responsive sensing means and to said signal processing means; g. visual indicator means electrically connected to said readout selector switching means for displaying numerical density values for the primary colors of red and green and blue; h. an amplification circuit for each of the primary colors of red and green and blue, said amplification circuits each being electrically connected to said color-responsive sensing means, said amplification circuits each having electrically connected signal distortion prevention means and signal standardization means and output amplification means; and i. a computation circuit electrically connected to each of said amplification circuits and having a channel for each of the primary colors of red and green and blue, said computation circuit being operative to produce an amplified signal corresponding to each of the densities of the primary colors of red and green and blue present in the light-transmitting color sample.
Claim 7
Independent Claim
388 words
A system for analyzing a light-transmitting color sample, comprising: a. a transmission box having a first portion selectively movable toward and away from a second portion having an aperture in one surface thereof; b. means in said first portion for directing diffused light through said aperture and through a light-transmitting color sample placed over said aperture, said diffused light-directing means including a light source and means for permitting escape of infrared energy and reflecting the visible portion of the spectrum of light from the light source and directing said visible portion through a plurality of infrared rejection mirrors and into light-diffusing means having an exit alignable with said aperture; c. color-responsive sensing means for producing electrical signals in response to received light with the signals corresponding to spectral response functions of the human eye for the primary colors of red and green and blue; d. means within said second portion for receiving light directed through the light-transmitting color sample and through said aperture and for diffusing the received light and directing same onto said color responsive sensing means; e. signal processing means having a red channel and a green channel and a blue channel, each channel being electrically connected to said color-responsive sensing means and operative to produce an amplified signal corresponding to the density of a respective one of the primary colors of red and green and blue present in the light-transmitting color sample; f. readout selector switching means electrically connected to said color-responsive sensing means and to said signal processing means; g. visual indicator means electrically connected to said readout selector switching means for displaying numerical density values for the primary colors of red and green and blue; h. an amplification circuit for each of the primary colors of red and green and blue, said amplification circuits each being electrically connected to said color-responsive sensing means, said amplification circuits each having electrically connected signal distortion prevention means and signal standardization means and output amplification means; and i. a computation circuit electrically connected to each of said amplification circuits and having a channel for each of the primary colors of red and green and blue, said computation circuit being operative to produce an amplified signal corresponding to each of the densities of the primary colors of red and green and blue present in the light-transmitting color sample.
Claim 8
Dependent Claim
185 words
A system for analyzing a light-transmitting color sample as set forth in claim 5 wherein: a. said diffused light-directing means includes an ellipsoidal reflector surface with the light source in the form of a lamp positioned at the focal point thereof whereby the reflector surface directs light into the diffusing means in the form of a tubular integration bar haviNg an entrance positioned to receive light from said reflector surface and an exit alignable with said aperture; b. said color-responsive sensing means is a photomultiplier tube for receiving each of the primary colors of red and green and blue; and c. said means receiving light directed through the sample and aperture and diffusing the received light and directing same onto the photomultiplier tubes of said color responsive sensing means includes a light-collecting member having a substantially hemispherical upper portion and a generally cylindrical lower portion, said upper portion having an entrance aligned with said aperture and said color-responsive sensing means to direct diffused light onto same whereby the strength of the electrical signal produced thereby is independent of the position of the respective photomultiplier tube.
Claim 9
Dependent Claim
149 words
A system for analyzing a light-transmitting color sample as set forth in claim 6 including; a. a translucent window in said second portion of said transmission box and having said aperture therein; b. illuminating means within said second portion and below said translucent window for illuminating same to permit location of a selected portion of the color sample over said aperture; and c. switching means electrically connected to said means for illuminating said window and electrically connected to said diffused light-directing means and responsive to position of said first portion of said transmission box for energizing said window illuminating means when said first portion is away from said second portion and energizing said diffused light-directing means when the exit of said integration bar is aligned with said aperture and also deactuating said window illuminating means thereby having only a measured intensity of diffused light directed through the color sample.
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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) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |