Abstract: An optical system for a confocal microscope comprising: an illumination pattern (1) irradiating an object (6) with light rays reflected thereby, a beam splitter (2) for passing the light rays from the illumination pattern (1) in the direction of the object (6) and for deflecting the light rays reflected by the object (6) in a focal plane (7) in the direction of a detector (3) for detecting an image of the object (6), and a (4, 5, 8) between the beam splitter (2) and the object (6), at least one lens of the lens assembly (4, 5, 8) being arranged movable for shifting the focal plane (7) at the object (6), is configured such that at least one lens of the lens assembly (4, 5, 8) is an aspherical lens and the movable lens (4) of the lens assembly (4, 5, 8) is located distal from the object (6).

Abstract: A device for tomographic scanning objects comprises a source of light for irradiating the object; a first grid arranged in the optical axis of the light beam so that a pattern of the first grid is projected on the object; an optical imaging assembly for imaging the object on a sensor; and a second grid provided in the optical axis of the reflected light beam having a pattern matching the first grid, through said second grid the reflected light beam having the pattern of the first grid being guided so that the sensor senses the light beam reflected by the object with a Moiré pattern resulting from overlying the pattern of the first grid and the pattern of the second grid. The device further comprises a means for moving the first grid and/or the second grid at a frequency causing fluctuations in the intensity of the resulting Moiré pattern.

Abstract: The Apparatus for determining the color stimulus specification of a translucent object, for example of a tooth, comprises an illumination device as well as an image capture device. For illuminating the object under test with light in different wave length portions, the illumination device comprises an LED array with a plurality of sequentially energizable light emitting diodes. Several different types of light emitting diodes are provided, each emitting light in a different wave length portion.

Abstract: The Apparatus for determining the color stimulus specification of a translucent object, for example of a tooth, comprises an illumination device as well as an image capture device. For illuminating the object under test with light in different wave length portions, the illumination device comprises an LED array with a plurality of sequentially energizable light emitting diodes. Several different types of light emitting diodes are provided, each emitting light in a different wave length portion.

Abstract: The present invention suggests an apparatus for simulating the ambient color and translucence conditions present in the oral cavity of a patient for the purpose of checking the color stimulus specification of dentures prior to their implanting into the oral cavity of a patient. The apparatus comprises an artificial jaw portion including a dimensionally stable, elastic artificial gum body portion simulating at least the vestibulary gum of a patient in which the teeth are inserted. The artificial gum body portion is made of a translucent material. The teeth can be individually replaced by dentures. The color stimulus specification of a denture inserted into the apparatus is checked by means of a color stimulus specification measuring apparatus and compared to the values obtained from a measurement taken in the oral cavity of a patient.

Abstract: The present invention suggests an apparatus for simulating the ambient color and translucence conditions present in the oral cavity of a patient for the purpose of checking the color stimulus specification of dentures prior to their implanting into the oral cavity of a patient. The apparatus comprises an artificial jaw portion including a dimensionally stable, elastic artificial gum body portion simulating at least the vestibulary gum of a patient in which the teeth are inserted. The artificial gum body portion is made of a translucent material. The teeth can be individually replaced by dentures. The color stimulus specification of a denture inserted into the apparatus is checked by means of a color stimulus specification measuring apparatus and compared to the values obtained from a measurement taken in the oral cavity of a patient.

Abstract: The apparatus for determining the color stimulus specification of translucent objects comprises two light sources to create on the surface of an object under test two light spots which have different size. The light is transmitted from the light sources to the object under test by means of an optically conducting fiber bundle. The light reflected by the object under test is received by a lens and led via an optically conducting fiber bundle to a spectrometer. Thereafter, the measurement signal is digitized and arithmetically evaluated in a microprocessor. Due to the fact that two differently sized light spots are used, the measurement error which results in determining the color specification value of a translucent object can be defined and corrected. For this purpose, use is made of reference measurement values which have been obtained by measuring opaque reference objects and which have been stored in a memory module of the apparatus.