Portable colorimeter
AssigneeInternational Business Machines Corporation
InventorViktors Berstis
Life of this patent
Estimating the term…
Loading patent…
AssigneeInternational Business Machines Corporation
InventorViktors Berstis
Estimating the term…
A handheld, pen-like colorimeter for measuring the color of an object is provided. The invention includes three light sensors, each of which detects a separate primary color. A microprocessor in the colorimeter calculates a single composite color value from the three separate color measurements from the light sensors and then compares the composite color value with a list of color values, wherein each value corresponds to a unique color name. The colorimeter selects the color name that matches the composite color value of the object presents the color name to a user, using a liquid crystal display (LCD) or an audio speaker. Another embodiment of the present invention uses lasers emitting primary colors, rather than passive light sensors. The lasers shine on an object one at a time, and the reflected laser light from the three lasers is detected by a special light sensor. The three color measurements are then combined to produce a composite value, similar to the first embodiment.
A handheld colorimeter for measuring the color of an object, comprising:
A handheld colorimeter for measuring the color of an object, comprising:
A handheld colorimeter for measuring the color of an object, comprising:
A handheld colorimeter for measuring the color of an object, comprising:
A handheld colorimeter for measuring the color of an object, comprising:
A handheld colorimeter for measuring the color of an object, comprising:
A handheld colorimeter for measuring the color of an object, comprising:
A method for measuring the color of an object, comprising:
A method for measuring the color of an object, comprising:
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
From the US filing history. Foreign family members aren’t listed.
Measurement of colour; Colour measuring devices, e.g. colorimeters: using electric radiation detectors
Spectrometry; Spectrophotometry; Monochromators; Measuring colours: details
Details: handheld
Using electric radiation detectors: colorimeters using spectrally-selective light sources, e.g. LEDs
Term ended 4 Aug 2021 (estimated)
1. Technical Field
The present invention relates generally to methods and devices for the measurement of the color of reflected and emitted light, and particularly to a handheld colorimeter.
2. Description of Related Art
The novel features believed characteristic of the invention are set forth in the appended claims. The invention itself, however, as well as a preferred mode of use, further objectives and advantages thereof, will best be understood by reference to the following detailed description of an illustrative embodiment when read in conjunction with the accompanying drawings, wherein:
FIGS. 1A and 1B depict schematic diagrams illustrating a handheld colorimeter in accordance with the present invention;
FIGS. 2A and 2B depict schematic diagrams illustrating an active handheld colorimeter in accordance with the present invention; and
The present invention is a simple pen-like device used to measure the color of reflected light. The pen colorimeter indicates an object's exact color on a liquid crystal display (LCD) on the side of the pen (similar to the displays on clock pens). The invention can be implemented in two ways, depending on the surface being measured. The invention can also be implemented as a combination of both methods.
Referring to FIGS. 1A and 1B, schematic diagrams illustrating a handheld colorimeter are depicted in accordance with the present invention. The tip 101 of colorimeter 100 contains three light sensors 110-112, each with an appropriate color filter to measure one of the primary colors. Because red, green and blue are the primary colors of light, all other colors are a composite of these three colors. In the present example, sensor 110 has a color filter that allows it to detect only red light emissions from an object. Similarly, sensors 111 and 112 have color filters for detecting green and blue light respectively. The color sensors can optionally include a small telephoto lens which exposes the sensor to a narrow column of light from the forward direction. The telephoto lenses with color filters on light sensors 110-112 allow colorimeter 100 to measure color at a distance and/or in the presence of ambient light, which is the primary shortcoming in the prior art. Optionally, a white LED 113, may be added to tip 101 for use in close range color measurement if lighting conditions are inadequate.
Colorimeter 100 contains a microprocessor which combines the separate measurements of red, green and blue light to calculate a composite RGB score. This composite score is determined by the intensity and ratio of the three primary colors. The microprocessor then looks up the color name corresponding to the RGB score and displays the name on the LCD display 102 on the side of the colorimeter 100. The color name might also be presented to the user by means of an audio speaker employing Text-to-Speech (TTS) technology. The color names can be stored in a table in internal memory, or in an external source to which the colorimeter 100 is connected.