Abstract:
Dispositif pour déterminer exactement la couleur d'une prothèse dentaire à poser, ou bien du matériau à utiliser dans les obturations de cavités dentaires, de manière à les rendre parfaitement identiques à la couleur des dents du patient. Il comporte une source lumineuse (1) émettant des rayons lumineux sur un monochromateur (2), lequel, à l'aide d'un commutateur ou d'un hacheur optiques (3), sépare lea rayons lumineux monochromatiques en au moins deux circuits parallèles (4, 4a, 5, 5a), l'un (4, 4a) comprenant un logement ou cellule (6) pour au moins une des dents du patient (9), l'autre (5, 5a) comprenant une cellule témoin (7) renfermant un échantillon témoin (28) de couleur blanche. Lesdits circuits aboutissent à un dispositif (8) qui détecte et compare les rayons provenant de la cellule (7) et ceux qui sont passés à travers la cellule (6) et la ou les dent(s) (9), fournissant une séquence de signaux qui sont appliqués à un détecteur (8), puis dûment amplifiés et appliqués à un convertisseur analogique-numérique (12) connecté à un processeur de données ou un ordinateur (10), lequel fournit les données d'identification codée relatives à la couleur identifiée.
Abstract:
PROBLEM TO BE SOLVED: To provide a spectrophotometric device for reducing an instrumental error between a plurality of spectrophotometric devices.SOLUTION: The spectrophotometric device 1 is configured to measure the spectral reflectivity of an object 9 to be measured, and to calculate the color value of the object 9 to be measured on the basis of the color-matching function and spectral reflectivity of an XYZ colorimetric system, and characterized to include an irradiation section for irradiating the object 9 to be measured with the rays of light having spectral intensity distribution in which relative intensity in a wavelength giving a peak value z in the color-matching function is 0.5 or more, in which the relative intensity is 1.
Abstract:
PROBLEM TO BE SOLVED: To provide a color measuring unit that can be downsized with high colorimetric accuracy while using a light source having a light-emitting diode or a plurality of phosphors, and to provide an image forming apparatus excellent in color reproducibility by using the color measuring unit.SOLUTION: A color measuring unit includes: a light source 12 for radiating white light to an object whose color is to be measured; a diffraction grating 18 for dispersing reflection light from the object whose color is to be measured; and a line sensor 11 comprising a plurality of pixels which generate electric signals corresponding to each intensity of light dispersed by the diffraction grating 18. The light source 12 has a light-emitting diode having a peak value of an emission intensity in a wavelength region from 380nm to 420nm and a plurality of phosphors having a peak value of an emission intensity in a wavelength region from 420nm to 730nm.
Abstract:
PROBLEM TO BE SOLVED: To attain low power consumption and a long life in a light source, while suppressing deterioration in measurement precision in a colorimeter, and also to improve measurement precision in a spectroscopic analyzer.SOLUTION: A spectrometric instrument includes: a light source 30; a light source drive part 10 including a power control part 12 for controlling the drive power of the light source; a measurement optical system 40 including a spectroscopic part 34 for dispersing light in accordance with each wavelength; a light reception part 50 (50') for receiving reflection light or transmission light from a sample 32 (32') being a measurement object, which passes through the measurement optical system, and converting the light into an electric signal; and a measurement part 60 for measuring light reception intensity corresponding to the wavelength of the light, based on the electric signal to be obtained from the light reception part. The power control part 12 changes power to be applied to the light source by association with the wavelength of the light in accordance with at least one among the spectroscopic characteristic of the light source, the spectroscopic characteristic of the measurement optical system, and the light reception sensitivity characteristic of the light reception part.
Abstract:
PROBLEM TO BE SOLVED: To provide a photometric system which reduces errors, even in the measurement of narrow-band light such as monochromatic light and performs measurements of chroma values or the like with high accuracy. SOLUTION: A chromameter 1 comprises a polychromater 4 as a spectral optical system including a light-receiving sensor array 43, a signal processing circuit 5, and an arithmetic and control unit 6. The arithmetic and control unit 6, using a light-receiving signal and a predetermined weighting coefficient, performs calculations for determining the characteristics of light to be measured, on the basis of predetermined spectral responsivity. The spectral responsivity of each light-receiving sensor, constituting the light-receiving sensor array 43, is selected to be B≥5 nm and A/B=1.5 to 4.0, where A is the half-value width of the spectral responsiveness and B is the center wavelength interval thereof. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To synthesize spectral sensitivity which is closely related to desired spectral sensitivity characteristics with high precision by small-scale circuitry with a high S/N in a colorimeter which separates light to be measured into a plurality of wavelength components by wavelength separation means, receives them by a plurality of light receiving means, respectively, and determines a signal with spectral sensitivity closely related to the desired spectral sensitivity characteristics. SOLUTION: Output currents I0 to I30 from pixel sensors P0 to P30 are subjected to A/D conversion and become capable of being retrieved at arbitrary rates by shunt circuits SP0 to SP30 without multiplying by a weighting factor corresponding to a two-degree field of view color-matching function of CIE. The shunt rates are set corresponding to the color-matching function by an arithmetic control circuit 5 through D/A and MX1. The shunt currents are integrated by integrating circuits Sx, Sy, Sy corresponding to the color-matching function, synthesize signals Vx, Vy, Vz corresponding to tristimulus values, and are subjected to digital conversion by ADx, ADy, ADz. Multiplying by the weighting factor is thus performed at the analog signal stage. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a color measuring device having high portability and convenience which can express color for various types of samples to be measured using an original index. SOLUTION: The color measuring device comprises a receiving part 223a which receives an external definitional equation of a user index defines by a user, a memory control part 224g which stores the receives definitional equation in a data memory 222 when receive the definitional equation, a code generation part 224e which replaces the definitional equation stored in the data memory 222 into a practicable code when a color measuring value is obtained, an index calculation part 224f which transfers the color measuring value to the user index by calculating the coded definitional equation, and a display control part 224h which displays the obtained user index on a monitor 205. COPYRIGHT: (C)2004,JPO
Abstract:
PURPOSE:To obtain a color image detector which is of inexpensive and simple constitution and is strong to mechanical vibrations and the like by interposing a dispersion element to an imagery optical system between three pieces of photoelectric conversion parts mounted with 3 color filters and an original. CONSTITUTION:An input image 2 of an original or the like is lighted by light sources 1, 1' and the image light is dispersed by the dispersion element 8 in an imagery optical system 7. The element 8 is constituted by combining prisms consisting of two kinds of optical materials having an equal refractive index with respect to light of a green color and having mutually different dispersion values. The beams of light of blue, green and red emitting from the system 7 are made incident respectively via filters 91-93 of blue, green and red to photoelectric conversion parts 51-53. The output of a photodetector 11 inputs to a masking circuit 10. Thereby, the color image detector which is of inexpensive and simple constitution and is strong to mechanical vibrations and the like is obtained.