Colorimetric device

The colorimeter addresses the issue of varying aperture sizes by using a removable aperture member and adaptive signal processing to maintain accurate color measurements through dynamic amplification adjustments, ensuring precision across different aperture sizes.

WO2026133667A1PCT designated stage Publication Date: 2026-06-25KONICA MINOLTA INC
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
KONICA MINOLTA INC
Filing Date
2025-09-18
Publication Date
2026-06-25

AI Technical Summary

Technical Problem

Existing color measuring devices face challenges in maintaining accurate colorimetric measurements when the size of the measurement aperture varies, leading to reduced light reception and measurement accuracy, especially when the aperture size is small.

Method used

A colorimeter with a removable measurement aperture member and an adaptive signal processing system that adjusts the amplification factor based on the aperture size, using multiple amplification units and AD conversions to maintain accurate color measurement across different aperture sizes.

Benefits of technology

The system ensures highly accurate color measurement regardless of the aperture size by dynamically adjusting amplification factors, compensating for reduced light reception, thereby improving measurement precision.

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Abstract

A colorimetric device comprises: a detachable measurement opening member (7) in which an opening (71) corresponding to a measurement region of a measurement target is formed; a light-receiving sensor (112) having a plurality of light-receiving elements (112a) that receive reflected light from the measurement region for each wavelength; a current-voltage conversion unit (121) that converts a current signal from each of the light-receiving elements into a voltage signal; at least one amplification unit (121), (123), (124) that amplifies an input signal at least in the current-voltage conversion unit or on the downstream side of the current-voltage conversion unit; an AD conversion unit (125) that converts an output signal from the amplification unit from an analog value into a digital value; and a calculation unit (130) that calculates color information. The amplification factors of the amplification unit (121) are switched on the basis of the size of the opening (71) of the measurement opening member (7).
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