Transmission type color calibration chart and calibration slide glass

Patent metadata

Field	Value
Publication number	US-11635329-B2
Application number	US-202217726804-A
Country	US
Kind code	B2
Filing date	Apr 22, 2022
Priority date	Mar 31, 2016
Publication date	Apr 25, 2023
Grant date	Apr 25, 2023

Abstract

A transmission type color calibration chart includes a transparent substrate and a color bar group formed on the transparent substrate, wherein the color bar group is constituted by color bars of a plurality of colors containing at least a first color and a second color arranged in a pattern in no particular order, coordinate points of the first color are within a region encompassed by the four points (0.351, 0.649), (0.547, 0.453), (0.380, 0.506) and (0.433, 0.464) on an xy chromaticity diagram, coordinate points of the second color are within a region encompassed by the four points (0.125, 0.489), (0.112, 0.229), (0.270, 0.407) and (0.224, 0.242) on an xy chromaticity diagram, and the transmission spectrum of the first color's color bar and the transmission spectrum of the second color's color bar have peak tops that are respectively separated.

First claim

The invention claimed is:

1. A transmission type color calibration chart comprising:
a transparent substrate; and
a color bar group disposed on the transparent substrate, the color bar group being constituted by a plurality of color bars including:
a first color bar of a first color, coordinate points of the first color being within a region encompassed by four points (0.351, 0.649), (0.547, 0.453), (0.380, 0.506) and (0.433, 0.464) on an xy chromaticity diagram;
a second color bar of a second color, coordinate points of the second color being within a region encompassed by four points (0.125, 0.489), (0.112, 0.229), (0.270, 0.407) and (0.224, 0.242) on the xy chromaticity diagram; and
a magenta color bar, a magenta transmission spectrum of the magenta color bar having two peak tops that are separated within the visible light region,

wherein a first color transmission spectrum of the first color bar and a second color transmission spectrum of the second color bar have peak tops that are respectively separated.

2. The transmission type color calibration chart according to claim 1 , wherein:
the plurality of color bars further includes:
a red color bar;
a green color bar; and
a blue color bar, and

a red transmission spectrum of the red color bar, a green transmission spectrum of the green color bar and a blue transmission spectrum of the blue color bar have peak tops that are respectively separated.

3. The transmission type color calibration chart according to claim 2 , wherein an inclusion rate of pointer colors included within a pentagon formed by connecting by straight lines chromaticity coordinates on the xy chromaticity diagram of the color bars of at least red, green, blue, the first color and the second color is 74.4% or greater.

4. A transmission type color calibration chart, comprising:
a transparent substrate; and
a color bar group disposed on the transparent substrate, the color bar group being constituted by a plurality of color bars including:
a white color bar;
a first color bar of a first color, coordinate points of the first color being within a region encompassed by four points (0.351, 0.649), (0.547, 0.453), (0.380, 0.506) and (0.433, 0.464) on an xy chromaticity diagram, a first peak wavelength of a first transmission spectrum of the first color bar being within a range of 540 nm-595 nm;
a second color bar of a second color, coordinate points of the second color being encompassed by four points (0.125, 0.489), (0.112, 0.229), (0.270, 0.407) and (0.224, 0.242) on the xy chromaticity diagram, a second peak wavelength of a second transmission spectrum of the second color bar being within a range of 470 nm-515 nm;
a red color bar, a red peak wavelength of a red transmission spectrum of the red color bar being within a range of 600 nm-680 nm;
a green color bar, a green peak wavelength of a green transmission spectrum of the green color bar being within a range of 495 nm-570 nm;
a blue color bar, a blue peak wavelength of a blue transmission spectrum of the blue color bar being within a range of 430 nm-490 nm; and
a magenta color bar, a magenta transmission spectrum of the magenta color bar having two peak tops that are separated within the visible light region.

5. The transmission type color calibration chart according to claim 4 , wherein an inclusion rate of pointer colors included within a pentagon formed by connecting by straight lines chromaticity coordinates on the xy chromaticity diagram of the color bars of at least red, green, blue, the first color and the second color is 90.3% or greater.

6. The transmission type color calibration chart according to claim 2 , wherein:
a red peak wavelength of the red transmission spectrum of is within a range of 620 nm 680 nm, and a red half width is 100 nm or less;
a green peak wavelength of the green transmission spectrum is within a range of 510 nm 540 nm, and a green half width is 80 nm or less; and
a blue peak wavelength of the blue transmission spectrum is within a range of 450 nm 472 nm, and a blue half width is 80 nm or less.

7. The transmission type color calibration chart according to claim 2 , wherein:
chromaticity coordinates on the xy chromaticity diagram of the second color bar is on an extension of a line connecting chromaticity coordinates on the xy chromaticity diagram of the red color bar and white coordinates of D65, and are positioned at an outer periphery of a color gamut stipulated by the BT.2020 standard or outside this color gamut; and
chromaticity coordinates on the xy chromaticity diagram of the first color bar is on an extension of a line connecting chromaticity coordinates on the xy chromaticity diagram of the blue color bar and the white coordinates, and are positioned at the outer periphery of the color gamut stipulated by the BT.2020 standard or outside this color gamut.

8. The transmission type color calibration chart according to claim 1 , wherein the plurality of color bars further includes an orange color bar, and an orange peak wavelength of an orange transmission spectrum of the orange color bar is within a range of 575 nm-620 nm.

9. The transmission type color calibration chart according to claim 1 , wherein the magenta color bar has a first peak wavelength within a range of 567 nm-780 nm, and a second peak wavelength within a range of 380 nm-495 nm.

10. The transmission type color calibration chart according to claim 2 , wherein chromaticity coordinates on the xy chromaticity diagram of the magenta color bar are on an extension of a line connecting chromaticity coordinates on the xy chromaticity diagram of the green color bar and white coordinates of D65.

Assignees

• Dainippon Printing Co Ltd

Inventors

• Ogino Yoshihiko
• Kajimura Yoichi
• Sahara Takahiro
• Taguchi Kunio
• Sasagawa Yasushi
• Mizuno Hitoshi
• Mitani Shota

Classifications

• G01J3/524 Primary

  Calibration of colorimeters · CPC title

• G02B21/34

  Microscope slides, e.g. mounting specimens on microscope slides · CPC title

• G01N21/27

  using photo-electric detection (G01N21/31 takes precedence){; circuits for computing concentration (logarithmic circuits G06G7/24; photometric circuits in general G01J)} · CPC title

• G01J3/52 Primary

  using colour charts · CPC title

• G01J3/0297 Primary

  Constructional arrangements for removing other types of optical noise or for performing calibration · CPC title