Abstract: A dental light polymerization device has an intra-oral tip portion and a handle portion. The dental light polymerization device has a polymerization light source and a light mixing element. The polymerization light source has a first LED exhibiting a first light emission peak wavelength and a second LED exhibiting a second light emission peak wavelength. The first and second LED each are configured for emitting visible light within a wavelength range of 380 nm to 495 nm. The first and second light emission peak wavelength differ from each other by at least 10 nm. The light mixing element is formed of a solid transparent body that has a rear portion and an adjacent front portion. The rear portion has the shape of a square-based truncated pyramid. Further, the front portion has a convex shape. The rear portion forms a rear end of the light mixing element and the front portion forms a front end of the light mixing element.

Abstract: An optoelectronic sensor (10) according to the principle of triangulation for detecting an object (36) in a monitoring region (18) comprises a light transmitter (12) and a spatially resolving light receiver (26). A receiving optics (22) and an optical element (24) are arranged in front of the light receiver (26), wherein the optical element (24) comprises a converging partial region (24a) and a diverging partial region (24c) and is arranged such that a remitted light bundle (20) from an object (36) in a near range of the monitoring region (18) passes through the converging partial region (24) and a remitted light bundle (20) from an object (36) in a far range of the monitoring region (18) passes through the diverging partial region (24c).

Abstract: An optoelectronic sensor (10) according to the principle of triangulation for detecting an object (36) in a monitoring region (18) comprises a light transmitter (12) and a spatially resolving light receiver (26). A receiving optics (22) and an optical element (24) are arranged in front of the light receiver (26), wherein the optical element (24) comprises a converging partial region (24a) and a diverging partial region (24c) and is arranged such that a remitted light bundle (20) from an object (36) in a near range of the monitoring region (18) passes through the converging partial region (24) and a remitted light bundle (20) from an object (36) in a far range of the monitoring region (18) passes through the diverging partial region (24c).

Abstract: A 2D barcode scanner (1) comprises a housing (2) having a reading window (3) and a digital camera (4) arranged in the housing (2) for detecting the area of the reading window (3) either directly or via a deflecting mirror arrangement (8, 9). At least one external light source (5) is provided for illuminating an area in front of the reading window (3) in the housing (2), at the side of the reading window (3) that is facing away from the digital camera (4). At least one external light source (5) is provided with an optical adapter (7) by which the light therefrom is distributed, such that the reflection paths are not illuminated at the inside of the reading window (3) back into the camera (4), or are illuminated with a very low intensity. This avoids or significantly reduces the intensity of the light reflections that arise on the inside of the reading window (3) and are superimposed on the barcode that is to be read as very bright spots in the image of the digital camera (4).

Abstract: A 2D barcode scanner (1) comprises a housing (2) having a reading window (3) and a digital camera (4) arranged in the housing (2) for detecting the area of the reading window (3) either directly or via a deflecting mirror arrangement (8, 9). At least one external light source (5) is provided for illuminating an area in front of the reading window (3) in the housing (2), at the side of the reading window (3) that is facing away from the digital camera (4). At least one external light source (5) is provided with an optical adapter (7) by which the light therefrom is distributed, such that the reflection paths are not illuminated at the inside of the reading window (3) back into the camera (4), or are illuminated with a very low intensity. This avoids or significantly reduces the intensity of the light reflections that arise on the inside of the reading window (3) and are superimposed on the barcode that is to be read as very bright spots in the image of the digital camera (4).

Abstract: The invention relates to an excimer lamp with a discharge chamber which holds a halogen-containing filling gas forming excimers under discharge conditions. Known excimer lamps have only a short burning life. In order to provide an excimer lamp with a long burning life, it is proposed according to the invention that the halogen content of the discharge chamber be a minimum of 1.times.10.sup.-10 mol/cm.sup.3 volume of the discharge chamber per cm.sup.2 of the discharge chamber interior surface area. To manufacture such a long-life excimer lamp, the interior surfaces of the discharge chamber may be treated with a halogen-containing passivating gas prior to filling in the filling gas or the required amount of halogen can be included in the filing gas.