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GB1124695A - Color density comparator - Google Patents

Color density comparator

Info

Publication number
GB1124695A
GB1124695A GB42055/66A GB4205566A GB1124695A GB 1124695 A GB1124695 A GB 1124695A GB 42055/66 A GB42055/66 A GB 42055/66A GB 4205566 A GB4205566 A GB 4205566A GB 1124695 A GB1124695 A GB 1124695A
Authority
GB
United Kingdom
Prior art keywords
test piece
reflectivity
sept
photo
conductor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB42055/66A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
UNITED COLOR CORP
Original Assignee
UNITED COLOR CORP
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by UNITED COLOR CORP filed Critical UNITED COLOR CORP
Publication of GB1124695A publication Critical patent/GB1124695A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/4738—Diffuse reflection, e.g. also for testing fluids, fibrous materials
    • G01N21/474—Details of optical heads therefor, e.g. using optical fibres

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Health & Medical Sciences (AREA)
  • Spectrometry And Color Measurement (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

1,124,695. Measuring reflectivity photoelectrically. UNITED COLOR CORP. Sept. 21, 1966 [Sept.27, 1965], No.42055/66. Heading G1A. The invention is a portable apparatus for measuring diffuse reflectivity which may be used to check the amount of ink applied to printed sheets. Light from a lamp 22 Fig. 2 in housing 10 having short legs 29 passes through an aperture 27 in the housing to fall at 45 degrees on to a test piece. Light reflected by the test piece normally to its surface is detected by a photo-conductor 24. The photo-conductor is connected with a potentiometer 17 Fig. 5 to form a voltage divider which controls the current through a transistor 32 and a milliameter 34 to indicate the reflectivity of the test piece. In use the apparatus may be first located over a standard surface and the potentiometer adjusted by knob 16 until the meter 34 shows zero. The meter will then show whether a test surface is darker or lighter than the standard by deflection to the right or left.
GB42055/66A 1965-09-27 1966-09-21 Color density comparator Expired GB1124695A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US49021865A 1965-09-27 1965-09-27

Publications (1)

Publication Number Publication Date
GB1124695A true GB1124695A (en) 1968-08-21

Family

ID=23947102

Family Applications (1)

Application Number Title Priority Date Filing Date
GB42055/66A Expired GB1124695A (en) 1965-09-27 1966-09-21 Color density comparator

Country Status (3)

Country Link
US (1) US3512894A (en)
DE (1) DE1497615A1 (en)
GB (1) GB1124695A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3814523A (en) * 1970-12-23 1974-06-04 Konishiroku Photo Ind Photo-electric densitometer
US3734630A (en) * 1971-09-09 1973-05-22 Logetronics Inc Copy density reading and exposure control system
US3802783A (en) * 1972-02-22 1974-04-09 J Simmonds Color shade analyzer
US4029420A (en) * 1974-12-27 1977-06-14 Romilly John Simms Light reflectance instrument
US4053237A (en) * 1976-07-02 1977-10-11 Westvaco Corporation Measuring the surface of a roller by glossmeter

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2358020A (en) * 1940-08-31 1944-09-12 Gen Motors Corp Color analyzing device
US2915938A (en) * 1956-02-27 1959-12-08 Leonard A Hughes Electronic colorimeter
US3053181A (en) * 1958-10-30 1962-09-11 Lithographic Technical Foundat Method for controlling print quality for lithographic presses
US3028499A (en) * 1959-11-02 1962-04-03 Gen Electric Expanded scale photoelectric device
US3088051A (en) * 1960-08-22 1963-04-30 Scanlon Thomas Aloysius Light sensitive unit
US3218462A (en) * 1961-11-29 1965-11-16 Ibm Direct current amplifier
US3221317A (en) * 1962-06-27 1965-11-30 Gen Electric Audible indicator circuit
US3333106A (en) * 1964-05-01 1967-07-25 Bendix Corp Circuit for improving the signal-to-noise ratio of photoelectric devices
US3376423A (en) * 1965-03-15 1968-04-02 Rca Corp Light responsive circuit which prevents photosensitive device saturation

Also Published As

Publication number Publication date
US3512894A (en) 1970-05-19
DE1497615A1 (en) 1969-07-10

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