Color matching apparatus for automotive repair paints

• US 6,539,325 B1
• Filed: 12/08/1999
• Issued: 03/25/2003
• Est. Priority Date: 05/22/1997
• Status: Expired due to Fees

• Current Assignee: Nisshinbo Industries, Inc. (Kawasaki Heavy Industries Limited), Nippon Paint Company Limited (Rainbow Light Limited)
• Original Assignee: Nisshinbo Industries, Inc. (Kawasaki Heavy Industries Limited), Nippon Paint Company Limited (Rainbow Light Limited)
• Inventors: Osumi, Masayuki, Numata, Shuhei, Kuwano, Koichi, Asaba, Takao
• Primary Examiner(s): Shah, Kamini
• Assistant Examiner(s): LE, JOHN H
• Application Number:
  US09/456,425
• Time in Patent Office: 1,203 Days
• Field of Search: 702/32, 702/127, 356/402, 356/405, 356/407, 356/425, 382/165, 358/1.9
• US Class Current: 702/127
• CPC Class Codes: G01J 3/46 Measurement of colour; Colour measuring devices, e.g. colorimeters measuring colour temperature G01J5/60
• CPC Class Codes: G01J 3/462 Computing operations in or between colour spaces; Colour management systems
• CPC Class Codes: G01J 3/463 Colour matching
• CPC Class Codes: G01J 3/504 Goniometric colour measurements, for example measurements of metallic or flake based paints

Abstract

This invention provides a color matching apparatus for automotive repair paints with which the color matching of a repair paint to an existing paint, whether containing or not containing a metallic or pearlescent pigment, can be performed with high precision in a reduced number of steps even by the novice. The apparatus of the invention comprises a computer, a color data file and a database reference system.

Claims

1. A color matching apparatus for automotive repair paints which comprises a computer, a color display, a spectrophotometer capable of color measurement at a plurality of viewing angles, and an electronic balance wherein said color matching apparatus is provided, as installed on said computer, a color matching computation system capable of performing a color matching computation for said automotive repair paint, a color data file and a database reference system capable of referring to a remote database server for retrieval of at least paint component base data and automotive top coat formulation base data via a communication channel and, in response to a computation command, is capable of carrying out said color matching computation for said automotive repair paint on the basis of colorimetric data obtained from said spectrophotometer and color data in said color data file and outputting the result of said color matching computation to said color display and electronic balance, with said apparatus, upon connection to the database server via said communication channel, being enabled to retrieve at least said paint component base data and automotive top coat formulation base data and use them in said color matching computation, wherein said color matching computation system is adapted to perform a predictive computation of a formulation giving a target spectral reflectance and a target flop value on the basis of calorimetric data obtained from said spectrophotometer and color data in said color data file taking into account the change in spectral reflectance at a metallic or pearlescent pigment, and the result of said predictive computation is corrected by a fuzzy deduction algorithm by using spectral reflectance data at a plurality of viewing angles as generated with a plurality of sample plates prepared according to varied formulations of colorant and metallic or pearlescent pigments under varied coating conditions as previously stored in a computer memory.

2. The color matching apparatus for automotive repair paints according to claim 1 wherein said color matching computation system performs said color matching computation taking into account the fading of coating of an automobile to be repair-coated using the automotive paint formulation data and calorimetric data retrieved from said database server.

3. The color matching apparatus for automotive repair paints according to claim 1 wherein said color matching computation system uses, in performing said color matching computation, the automotive top coat formulation data and calorimetric data retrieved from said database server as the information for enhancing the accuracy and speed of said color matching computation.

4. The color matching apparatus for automotive repair paints according to claim 1 wherein, in a stage where the components to be formulated are weighed out with said electronic balance according to a predicted formulation determined by said color matching computation, the predicted reproduction color corresponding to a formulation in the course of said weighing is displayed in real time on a color display in parallel with a target color for comparison.

5. The color matching apparatus for automotive repair paints according to claim 1 wherein said spectrophotometer comprises a docking station and a color measuring unit comprising a battery, wherein said battery is rechargeable while said color measuring unit is set in said docking station and remains connected to an external power supply wherein said color measuring unit is capable of measuring the color of a sample plate even in the condition of said color measuring unit remaining set on said docking station.

6. The color matching apparatus for automotive repair paints according to claim 1 further comprising a goniospectrophotometer adapted to generate goniospectral reflectance data on a metallic or pearlescent pigment-containing paint film color and using said data in said color matching computation.

7. The color matching apparatus for automotive repair paints according to claim 1 wherein at least said computer and color display are enclosed in a solvent-resistant housing.

8. The color matching apparatus for automotive repair paints according to claim 1 wherein said housing is made of stainless steel, said color display comprises a touch panel made of solvent-resistant material, and the exterior of said measuring unit of the spectrophotometer color is made of solvent-resistant resin.

9. The color matching apparatus for automotive repair paints according to claim 8 wherein said touch panel is a panel of the ultrasonic scanning type.

10. The color matching apparatus for automotive repair paints according to claim 7 wherein said computer is a computer of low power consumption and small heat generation.