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Abstract

A hand-held color measurement device is provided that includes a housing with an opto-measurement unit. The latter includes an optics array for receiving measurement light and a sensor array which is exposed to the measurement light, converts the measurement light into electrical measurement signals, and processes them to form digital measurement data. The measurement unit (M) consists of an aspherical input lens (L₁), an aperture (B) for limiting the incident angular range, a depolarizing diffuser (D), a sensor lens (L₂) and at least three sensors (S₁, 5₂, S₃) which are sensitized to different spectral ranges using color filters (F₁, F₂, F₃). The aperture (B) lies substantially in the focal plane of the input lens (L₁), and the diffuser (D) is arranged in the immediate vicinity of the aperture (B) and in the focal plane of the sensor lens (L₂). The filters (F₁, F₂, F₃) and the sensors (S₁, S₂, S₃) are arranged close to the optical axis (A) and exposed to substantially parallel measurement light. The filters (F₁, F₂, F₃) are configured to the spectral characteristics of the tristimulus color values XYZ according to CIE. For ambient light measurements, an additional diffuser (D_E) can be placed in front of the input lens.

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First Claim