Color sensor

• US 5,963,333 A
• Filed: 09/04/1997
• Issued: 10/05/1999
• Est. Priority Date: 09/12/1996
• Status: Expired due to Term

• Current Assignee: Color Savvy Systems Ltd.
• Original Assignee: Color Savvy Systems Ltd.
• Inventors: Duke, Ronald J., Vrhel, Michael J., Walowit, Eric, Sam, Long B., Iseli, Victor L.
• Primary Examiner(s): Font, Frank G.
• Assistant Examiner(s): STAFIRA, MICHAEL PATRICK
• Application Number:
  US08/923,705
• Time in Patent Office: 761 Days
• Field of Search: 356/326, 356/328, 356/330-334, 356/445-448, 356/237.1, 356/402, 356/406-408, 356/420, 356/425, 356/430, 356/431, 250/226
• US Class Current: 356/425
• CPC Class Codes: G01J 2003/2866 Markers; Calibrating of scan
• CPC Class Codes: G01J 3/0251 Colorimeters making use of an integrating sphere
• CPC Class Codes: G01J 3/0272 Handheld
• CPC Class Codes: G01J 3/46 Measurement of colour; Colour measuring devices, e.g. colorimeters measuring colour temperature G01J5/60
• CPC Class Codes: G01J 3/463 Colour matching
• CPC Class Codes: G01J 3/465 taking into account the colour perception of the eye; using tristimulus detection
• 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

Abstract

A hand-manipulatable device includes a sensor for gathering reflective, densitometric, spectrophotometric, colorimetric, self-luminous or radiometric readings from a sample surface. The device includes a housing having a substantially flat bottom surface and a top surface contoured to fit comfortably in the fingers and palm of the human hand. The housing also includes area on its top surface for seating an index finger of the human hand. Positioned within this area is a pressure-activated switch that is operatively coupled to the sensor circuitry for performing the readings. Preferably, the sensor is mounted into the device such that the focal aperture of the sensor is in axial alignment with the pressure-activated switch. Accordingly, a user will be able to use the device to "point" with his or her index finger to an area of the sample surface, and will then simply press the switch to initiate the readings, using the same index finger.

Claims

1. A hand-manipulatable device for gathering reflective, densitometric, spectrophotometric, colorimetric, self-luminous or radiometric readings from a sample surface, comprising:

a housing having a substantially flat bottom surface and a top surface contoured to fit comfortably in the fingers and palm of the human hand;

a sensor mounted to said housing, including a focal aperture and including circuitry and optics for performing a reflective, densitometric, spectrophotometric or colorimetric reading from a portion of said sample surface aligned with said focal aperture;

a switch operatively coupled to said sensor for activating said sensor to perform said reading; and

a data link adapted to be operatively coupled between said sensor and a computer for relaying data from said sensor to said computer;

said sensor including (a) a printed circuit board mounted within said housing, (b) a plurality of light sources, mounted within said housing, respectively emitting light of a substantially different wavelength band, (c) a sample photodetector mounted to said printed circuit board, (d) a first optical element to direct a first portion of light emitted by each of said light sources to the sample surface, and (e) a second optical element to direct a portion of light reflected from the sample to said sample photodetector.

2. The hand-manipulatable device of claim 1, wherein said focal aperture is in substantial vertical alignment with an area in said top surface of said housing for seating a tip of an index finger.

3. The hand-manipulatable device of claim 2, wherein said switch is a pressure activated switch mounted to said housing substantially in said area for seating a tip of an index finger.

4. The hand manipulatable device of claim 1, wherein:

said printed circuit board includes a plurality of apertures extending completely therethrough;

at least one aperture is provided for a corresponding one of said light sources; and

each of said sources are positioned substantially adjacent to said corresponding aperture.

5. The hand manipulatable device of claim 4, wherein said light sources are light emitting diodes which are mounted to a daughterboard, the daughterboard being coupled to said printed circuit board.

6. A hand-manipulatable device for gathering reflective, densitometric, spectrophotometric, colorimetric, self-luminous or radiometric readings from a sample surface, comprising:

a housing having a substantially flat bottom surface and a top surface contoured to fit comfortably in the fingers and palm of the human hand;

a sensor mounted to said housing, including a focal aperture and including circuitry and optics for performing a reflective, densitometric, spectrophotometric or colorimetric reading from a portion of said sample surface aligned with said focal aperture;

a switch operatively coupled to said sensor for activating said sensor to perform said reading; and

a data link adapted to be operatively coupled between said sensor and a computer for relaying data from said sensor to said computer;

said sensor including (a) a printed circuit board mounted within said housing, (b) a plurality of light sources, mounted within said housing, respectively emitting light of a substantially different wavelength band, (c) a sample photodetector mounted to said printed circuit board, (d) a first optical element to direct a first portion of light emitted by each of said light sources to the sample surface, (e) a second optical element to direct a portion of light reflected from the sample to said sample photodetector, (f) a reference photodetector mounted to said printed circuit board, and (g) a third optical element to direct a second portion of light emitted by each of said light sources to said reference photodetector.

7. The hand manipulatable device of claim 6, wherein said third optical element is an optical cap having a substantially non-absorbing interior integrating surface, mounted over said apertures and said reference photodetector, said optical cap forming a reference chamber, whereby, said second portion of light emitted by said light sources reflects off of said interior integrating surface of said optical cap and said reference photodetector receives a substantial amount of said second portion of light reflected off of said interior integrating surface.

8. The hand manipulatable device of claim 7, wherein said optical cap is integral with said housing.

9. The hand manipulatable device of claim 6, wherein said reference photodetector and said sample photodetector are mounted substantially back-to-back so as to share environmental characteristics.

10. A hand-manipulatable device for gathering reflective, densitometric, spectrophotometric, colorimetric, self-luminous or radiometric readings from a sample surface, comprising:

a housing having a substantially flat bottom surface and a top surface contoured to fit comfortably in the fingers and palm of the human hand;

a sensor mounted to said housing, including a focal aperture and including circuitry and optics for performing a reflective, densitometric, spectrophotometric or colorimetric reading from a portion of said sample surface aligned with said focal aperture;

a switch operatively coupled to said sensor for activating said sensor to perform said reading; and

a data link adapted to be operatively coupled between said sensor and a computer for relaying data from said sensor to said computer;

said sensor including (a) a printed circuit board mounted within said housing, (b) a plurality of light sources, mounted within said housing, respectively emitting light of a substantially different wavelength band, (c) a sample photodetector mounted to said printed circuit board, (d) a first optical element to direct a first portion of light emitted by each of said light sources to the sample surface, and (e) a second optical element to direct a portion of light reflected from the sample to said sample photodetector;

said printed circuit board including a plurality of apertures extending completely therethrough, at least one aperture being provided for a corresponding one of said light sources, and each of said sources being positioned substantially adjacent to said corresponding aperture;

said light sources being arranged about said sample photodetector;

said second optical element being mounted over said sample photodetector and including a receiving aperture in optical alignment with said sample photodetector;

said first optical element including a reflector cone, said reflector cone including hollow cavity, a tip, and said focal aperture in said tip, said focal aperture providing optical communication into said hollow cavity;

said reflector cone being mounted over said apertures and said second optical element to form a sample chamber, said focal aperture being positioned in optical alignment with said receiving aperture;

said reflector cone including a frustoconically shaped reflective inner surface, axially aligned with said focal aperture, and positioned to intersect with said first portion of light emitted by said light sources; and

said reflective inner surface of said hollow cavity being angled inwardly toward said focal aperture at an angle so as to direct said first portion of light emitted by said light emitting toward sample at substantially a 45°

angle, such that said first portion of light reflects from the sample at substantially a 45°

angle and said sample photodetector receives a diffuse component of said light reflected from the sample.

11. A hand-manipulatable device for gathering reflective, densitometric, spectrophotometric, colorimetric, self-luminous or radiometric readings from a sample surface, comprising:

a housing having a substantially flat bottom surface and a top surface contoured to fit comfortably in the fingers and palm of the human hand;

a sensor mounted to said housing, including a focal aperture and including circuitry and optics for performing a reflective, densitometric, spectrophotometric or colorimetric reading from a portion of said sample surface aligned with said focal aperture;

a switch operatively coupled to said sensor for activating said sensor to perform said reading; and

a data link adapted to be operatively coupled between said sensor and a computer for relaying data from said sensor to said computer;

said sensor including (a) a plurality of light emitting diodes, each of said diodes respectively emitting light of a substantially different wavelength band, mounted within said housing, (b) a light-pipe for directing light emitted from said diodes to said optics, said optics being adapted to transmit light directed from said light pipe to said focal aperture at an angle of approximately 45°

, (c) a reference photodetector for receiving light bled from said light-pipe, and (d) a sample photodetector for receiving a diffuse component of said light transmitted to said focal aperture by said optics and reflected from a sample surface.

12. A hand-manipulatable device for gathering reflective, densitometric, spectrophotometric, colorimetric, self-luminous or radiometric readings from a sample surface, comprising:

a housing having a substantially flat bottom surface and a top surface contoured to fit comfortably in the fingers and palm of the human hand;

a sensor mounted to said housing, including a focal aperture and including circuitry and optics for performing a reflective, densitometric, spectrophotometric or colorimetric reading from a portion of said sample surface aligned with said focal aperture;

a switch operatively coupled to said sensor for activating said sensor to perform said reading; and

a data link adapted to be operatively coupled between said sensor and a computer for relaying data from said sensor to said computer;

said sensor including (a) a plurality of light sources, mounted within said housing, respectively emitting light of a substantially different wavelength band, (b) a sample photodetector mounted within said housing, (c) a first optical element to direct a first portion of light emitted by each of said light sources to the sample surface, and (d) a second optical element to direct a portion of light reflected from the sample to said sample photodetector.

13. The hand-manipulatable device of claim 12, wherein said sensor further includes (e) a reference photodetector mounted within said housing, and (f) a third optical element adapted to direct a second portion of light emitted by each of said light sources to said reference photodetector.

14. The hand-manipulatable device of claim 13, wherein said sample photodetector and said reference photodetector are mounted in close proximity to one another so as to share environmental characteristics.

15. The hand-manipulatable device of claim 12, wherein said focal aperture is in substantial vertical alignment with an area in said top surface of said housing for seating a tip of an index finger.

16. A hand-manipulatable device for gathering reflective, densitometric, spectrophotometric, colorimetric, self-luminous or radiometric readings from a sample surface, comprising:

a housing having a substantially flat bottom surface and a top surface contoured to fit comfortably in the fingers and palm of the human hand;

a sensor mounted to said housing, including a focal aperture and including circuitry and optics for performing a reflective, densitometric, spectrophotometric or colorimetric reading from a portion of said sample surface aligned with said focal aperture;

a switch operatively coupled to said sensor for activating said sensor to perform said reading; and

a data link adapted to be operatively coupled between said sensor and a computer for relaying data from said sensor to said computer;

said sensor including (a) a plurality of light sources, mounted within said housing, respectively emitting light of a substantially different wavelength band, (b) a sample photodetector mounted within said housing, (c) means for directing a first portion of light emitted by each of said light sources to the sample surface, and (d) means for directing a portion of light reflected from the sample to said sample photodetector.