Handheld, portable color measuring device with display

• US 20020036778A1
• Filed: 05/11/2001
• Published: 03/28/2002
• Est. Priority Date: 09/28/2000
• Status: Active Grant

• Current Assignee: Color ZIP Technology Company Limited
• Original Assignee: Color ZIP Technology Company Limited
• Inventors: Stewart, Robert, Emerson, Gary, Wagner, Gregg
• Granted Patent: US 6,798,517 B2
• Time in Patent Office: Days
• US Class Current: 356/406
• CPC Class Codes: G01J 3/02 Details
• CPC Class Codes: G01J 3/0205 Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
• CPC Class Codes: G01J 3/0262 Constructional arrangements for removing stray light
• CPC Class Codes: G01J 3/0272 Handheld
• CPC Class Codes: G01J 3/0283 using a charging unit
• CPC Class Codes: G01J 3/0291 Housings; Spectrometer accessories; Spatial arrangement of elements, e.g. folded path arrangements
• CPC Class Codes: G01J 3/10 Arrangements of light sources specially adapted for spectrometry or colorimetry
• CPC Class Codes: G01J 3/50 using electric radiation detectors
• CPC Class Codes: G01J 3/501 Colorimeters using spectrally-selective light sources, e.g. LEDs
• CPC Class Codes: G01J 3/524 Calibration of colorimeters
• CPC Class Codes: G01N 21/251 Colorimeters; Construction thereof

Abstract

A handheld, portable color measuring device for measuring the primary colors of red, green and blue in a color target to be analyzed and connected to a built-in LCD display or connected to a separate personal computer. The color measuring device includes an elongated color measuring probe housing. A hollow cone shaped probe tip is attached to one end of the probe housing. A target contact end of the probe tip is placed against a color target to be measured. Inside the probe housing is a battery powered white LED light source connected to a color measurement switch. When the measurement switch is actuated, the white light source illuminates the color target surrounded by the target contact end of the probe tip. A light pipe is centered inside the probe housing and inside a portion of the probe tip. The light pipe captures the reflected light off the color target and projects the captured light onto a 3 color (RGB) sensor. The sensor collects an analog light signal which is made up of percentages of red, green and blue. The light signal is amplified and converter to a digital signal using an A/D converter. The A/D converter is part of a microprocessor mounted on a printed circuit board inside the probe housing. The digital signal is processed by the microprocessor and the percentages of red, green and blue are displayed on the LDC display or on the screen of the computer.

Claims

1. A handheld, portable color measuring device for measuring three different colors in a color target to be analyzed, the color measuring device comprising:

a color measuring probe housing;

a hollow probe tip attached to one end of said probe housing, said probe tip adapted for placing next to the color target to be measured;

a white light source mounted inside the probe housing and connected to a power source;

a color measurement switch mounted on said probe housing and connected to said power source and connected to said white light source, when said measurement switch is actuated said white light source illuminating the color target surrounded by an end of said probe tip;

means for capturing a reflected light signal off the color target when the color target is illuminated, said means for capturing disposed inside said probe housing;

a 3 color sensor mounted inside said probe housing, said 3 color sensor receiving the reflected light signal from said means for capturing;

a microprocessor mounted in said probe housing and connected to said power source and said 3 color sensor, said microprocessor for processing the reflected light signal; and

display means connected to said microprocessor, said display means for displaying the reflected light signal in percentages of red, green and blue.

2. The color measuring device as described in claim 1 wherein said display means is a built-in LCD display mounted in said probe housing.

3. The color measuring device as described in claim 1 wherein said display means is a personal computer electrically connected to said microprocessor.

4. The color measuring device as described in claim 1 wherein said white light source is a white LED light source.

5. The color measuring device as described in claim 1 wherein said power source is a battery mounted inside said probe housing.

6. The color measuring device as described in claim 1 wherein said means for capturing is a light pipe centered inside said probe housing.

7. A handheld, portable color measuring device for measuring the primary colors of red, green and blue in a color target to be analyzed, the color measuring device comprising:

an elongated color measuring probe housing;

a hollow cone shaped probe tip attached to one end of the probe housing, said probe tip having a target contact end adapted for placing against the color target to be measured;

a white LED light source mounted inside the probe housing connected to a battery power source;

a color measurement switch connected to said battery power source and connected to said white LED light source, said white light source for illuminating the color target surrounded by the target contact end of said probe tip;

a light pipe centered inside said probe housing and inside a portion of said probe tip, said light pipe capturing a reflected light signal off the color target;

a 3 color (RGB) sensor connected to said battery power source and mounted inside said probe housing, said 3 color sensor receiving the reflected light received through said light pipe;

a microprocessor connected to said battery power source and mounted in said probe housing, said microprocessor connected to said 3 color sensor for processing the reflected light signal; and

display means connected to said microprocessor, said display means for displaying the reflected light signal in percentages of red, green and blue.

8. The color measuring device as described in claim 7 wherein said display means is a built-in LCD display mounted in an opposite end of said probe housing.

9. The color measuring device as described in claim 8 wherein said LCD display displaces a color match received from stored color data in memory from said microprocessor.

10. The color measuring device as described in claim 7 wherein said display means is a display screen of a personal computer electrically connected to said microprocessor.

11. The color measuring device as described in claim 10 wherein the display screen of said personal computer displaces a color match received from stored color data in memory from said personal computer.

12. The color measuring device as described in claim 7 wherein said white light source is a white LED light source.

14. The method as described in claim 13 wherein the step of capturing the reflected light signal includes capturing the reflected light signal inside a light pipe received inside the probe housing and next to the 3-color sensor.

15. The method as described in claim 13 wherein the step of displaying percentages of the 3 colors includes displaying the percentages of the 3 colors on a built-in LCD display mounted on the probe housing.

16. The method as described in claim 15 further including the step of displaying a color match on the LCD display, the color match stored color data in memory from the microprocessor.

17. The method as described in claim 13 wherein the step of displaying percentages of the 3 colors includes displaying the percentages of the 3 colors on a display screen of a personal computer electrically connected to the microprocessor.

18. The method as described in claim 17 further including the step of displaying a color match on the display screen of the personal computer, the color match received from stored color data in memory from the personal computer.

19. The method as described in claim 13 wherein the light source is a white LED light source.

20. The method as described in claim 13 wherein the power source is a battery power source.

13. A method for measuring at least three colors in a color target using a color measuring device, the color measuring device having a color measuring probe housing with a hollow probe tip adapted for placing next to a color target to be measured, a light source mounted inside the probe housing connected to a power source, a 3 color sensor connected to the power source and mounted inside the probe housing, a microprocessor connected to the power source and a display screen connected to the power source, the steps comprising:

illuminating the color target next to the probe tip with the light source;

capturing a reflected light signal off the color target inside the probe housing,

measuring the reflected light signal on the 3 color sensor;

processing the 3 color sensor measurement using the microprocessor; and

displaying percentages of the 3 colors from the color target on the display screen.