102 results about "Colorimeter" patented technology

A method for measuring chroma value by colorimeter to solve the drawbacks of conventional technologies, such as an inaccurate illuminant and the filter of color-matching function is difficult to be deposited and manufactured within an filter mod colorimeter, and an expensive spectrometer used within an spectrum mode calorimeter. The present invention does not need the spectrometer and the filter of color-matching function, and can measure an accurate chroma value of an object by using a multi-band illuminant illuminating the object and a power meter. Besides, the multi-band illuminant can be adjusted the illumination condition of standard illuminator under different color temperature, and measure the chroma value of the object under different color temperature. The accuracy of the measured chroma value is up to the level of the spectrum mode colorimeter, and the price is cheaper than the spectrum mode calorimeter.

When a grid point that is the object to be mapped is present in a first division region a color of which has lightness equal to or higher than the lightness at the maximum chroma point in the color gamut and has chroma higher than the chroma at that point, the intersection of a straight line connecting the grid point to the maximum chroma point and an achromatic axis is calculated and a point having lightness equal to or higher than the lightness of the intersection is set as the focal color. Then, the intersection of a straight line connecting the object grid point to the focal color and the boundary of color gamut is set as an output color for the grid point. The output colors are prevented from being separated into color on the high and on the low lightness sides with respect to the maximum chroma point.

The invention provides a bubble flowing resistant colorimeter cell capable of simultaneously detecting absorbance and fluorescence, which belongs to optical elements for carrying out absorbance analysis and fluorescence analysis on liquid samples in the field of analysis instruments. The bubble flowing resistant colorimeter cell comprises a black base, a sample inlet tube, a light through hole passage, another light through hole passage and a sample outlet tube, wherein a cylindrical light through hole passage is arranged in the black base in a diagonal line direction; the other light through hole passage is arranged in a vertical direction of a central axis of the light through hole passage; the sample inlet tube and the sample outlet tube, which are used for a detected liquid to flow through, are arranged on the black base; the detected liquid flows in from the sample inlet tube, flows through end walls of the light through hole passage and the other light through hole passage and flows out from the sample outlet tube so as to form a Z-shaped liquid passage structure. According to the invention, as one light through hole passage vertical to the other light through hole passage is arranged, detections, such as absorbance detection, fluorescence wavelength detection, can be simultaneously carried out; as the light through hole passage and the other light through hole passage are blocked up, the sample cannot enter between the light through hole passage and the other light through hole passage; and through the adoption of the Z-shaped liquid passage, small bubbles in the sample can be gathered at the top, so that a measuring error is reduced.

An image reading apparatus includes: a conveyor that conveys paper on which an image is formed along a conveyance path; a first guide member including a first opening on a reference surface opposed to the conveyance path that guides the conveyed paper; a first opposing member that arranges the image on the paper in a colorimetric range set in the first opening on the reference surface by pressing the reference surface via the paper to allow the paper to abut the reference surface; a second opposing member that presses the reference surface by a pressing surface including a calibrating member in a reference color to arrange the calibrating member in the colorimetric range; and a colorimeter arranged on a side opposite to the conveyance path across the first guide member that performs colorimetry on the image on the paper and the calibrating member arranged in the colorimetric range.