Title:
MEASURING METHOD OF SURFACE COLOR TONE
Document Type and Number:
Japanese Patent JP2606028
Kind Code:
B2
Abstract:
PURPOSE: To measure a surface color tone of a substance to be measured which has the color tone of an achromatic color system and is in movement, by measuring reflectances in three wavelengths (narrow wavelength bands) in a specific wavelength region of a visible light and by determining an average value of gradients of the reflectances among these three wavelength bands.
CONSTITUTION: Three wavelengths (narrow wavelength bands) are selected from a reflected light in a visible light region of a substance to be measured and reflectances are determined. In other words, a central wavelength is selected from a wavelength range of 480 to 550nm and a reflectance in a wavelength band of ±10nm or below in relation to the central wavelength is measured. Next, the central wavelength is selected from the wavelength range of 550 to 620nm and the reflectance in the wavelength band of ±10nm or below in relation to this central wavelength is measured. Subsequently, the central wavelength is selected from the wavelength range of 620 to 700nm and the reflectance in the wavelength band of ±10nm or below in relation to the central wavelength is measured. An average value of gradients (reflectance difference (%)/wavelength difference (nm) between central wavelengths) of the reflectances among these three wavelength bands is made a measured value of a surface color tone of the substance to be measured.
Inventors:
Maeda Kozo
Masaki Takenaka
Mitsuo Hokyu
Inaba Mamoru
Shinsuke Watanabe
Masaki Takenaka
Mitsuo Hokyu
Inaba Mamoru
Shinsuke Watanabe
Application Number:
JP26827191A
Publication Date:
April 30, 1997
Filing Date:
September 19, 1991
Export Citation:
Assignee:
Nippon Steel Tube Co., Ltd.
International Classes:
G01J3/50; (IPC1-7): G01J3/50
Domestic Patent References:
| JP3193897A |
Attorney, Agent or Firm:
Tomomachi Masatoshi