Abstract: In a model data generation device configured to generate model data of an electronic component to be mounted on a printed board, the model data includes data about terminals to and data about a mounting reference point with respect to the printed board. The mounting reference point of the model data is determined by using first image data about an electronic component captured by a component recognition camera and second image data including information about pads of the printed board that overlap the terminals of the electronic component and information about a mounting position of the electronic component on the printed board.

Abstract: In a model data generation device configured to generate model data of an electronic component to be mounted on a printed board, the model data includes data about terminals to and data about a mounting reference point with respect to the printed board. The mounting reference point of the model data is determined by using first image data about an electronic component captured by a component recognition camera and second image data including information about pads of the printed board that overlap the terminals of the electronic component and information about a mounting position of the electronic component on the printed board.

Abstract: In one embodiment, a current mirror circuit includes first to fourth insulated gate field effect transistors (FETs), and a bias circuit. The gate electrodes of the first and second FETs are connected to each other. The source electrode of the third FET is connected to the drain electrode of the first FET, and the drain electrode of the third FET is connected to the gate electrodes of the first and second FETs and a current input terminal. The gate electrode of the fourth FET is connected to the gate electrode of the third FET, the source electrode of the fourth FET is connected to the drain electrode of the second FET, and the drain electrode of the fourth FET becomes a current output terminal. The bias circuit is configured to provide a bias voltage to the gate electrodes of the third and fourth FETs.

Abstract: In one embodiment, a current mirror circuit includes first to fourth insulated gate field effect transistors (FETs), and a bias circuit. The gate electrodes of the first and second FETs are connected to each other. The source electrode of the third FET is connected to the drain electrode of the first FET, and the drain electrode of the third FET is connected to the gate electrodes of the first and second FETs and a current input terminal. The gate electrode of the fourth FET is connected to the gate electrode of the third FET, the source electrode of the fourth FET is connected to the drain electrode of the second FET, and the drain electrode of the fourth FET becomes a current output terminal. The bias circuit is configured to provide a bias voltage to the gate electrodes of the third and fourth FETs.

Abstract: An inspecting apparatus and an inspecting method capable of detecting a state inside the cream solder are provided. An illumination device (5) irradiates infrared light at predetermined intensity to a board on which cream solder is applied. An image taking device (6) takes an image of the board to which the infrared light is irradiated. A main control portion (95) in a control device (9) is capable of detecting a sectional shape of the cream solder according to an intensity distribution of infrared light reflected on the board from image data of the image captured by the image taking device (6). Also, because reflected light from the cream solder surface can be eliminated by an elimination portion (95c), the sectional shape of the solder can be detected more exactly.

Abstract: The shape of a cream solder is accurately detected, irrespective of a cream solder composition. An illumination setting section (95b) sets the intensity of infrared light radiated by an illuminating device (5), in accordance with the cream solder composition. An photographing device (6) irradiates a board applied with the cream solder with the infrared light having the light intensity set by the illuminating device (5). The photographing device (6) images the board irradiated with the infrared light by the illuminating device (5). As a result, an image including an image of light reflected from a surface of the board can be acquired.

Abstract: A technique according to the present invention allows a projection-type image display system to suppress the temperature rise of the polarization split devices and secure high image quality. Polarization split means has a polarization split device arranged in a medium with a refractive index larger than 1. The polarization split device has a polarization split surface on which a diffractive grating structure is formed to polarize and split light. An air layer is formed in contact with the polarization split surface. In a projection type image display apparatus or an optical unit using this apparatus, light fluxes are polarized and split by the polarization split means before irradiated to light valves and after modulated by the light valves and color composition is made from the polarized and split light fluxes before enlarged and projected by a projection lens unit.

Abstract: A compact, light projection type image display apparatus based on reflection image display devices which provide high brightness without contrast deterioration caused by light leakage associated with black image display. The apparatus uses, as polarizers/analyzers for reflection image display devices, reflection polarizing plates which function as polarizing plates by their grating function only in a specific direction. In each light path, the reflection polarizing plate is located just before/after the reflection image display device.

Abstract: An optical unit includes a light source, a color separator, reflection-type image display elements, a color synthesizer, a reflection-type polarization plate, and an optical chassis. The optical chassis holds the reflection-type polarization plate and the reflection-type image display elements thereon, and has a translucent window on an incident light side of the reflection-type polarization plate while an exiting light side of the reflection-type polarization plate is sealed with an incident surface of the color synthesizer. A hermetically sealed space is defined by the optical chassis, the reflection-type image display elements and the incident surface of the color synthesizer, and within the hermetically sealed space is disposed a translucent liquid having a refraction index from 1.2 to 1.9.

Abstract: The present invention provides a projection type image display device capable of affording a bright display of a high saturation and capable of ensuring a high reliability of optical parts. The projection type image display device is provided with a color synthesizer for color-synthesizing modulated and polarized light of red light, green light, and blue light, outputted from an image display element. The color synthesizer has an optical characteristic such that the transmittance including reflection by a reflecting film in the interior of the color synthesizer becomes highest for the polarized light of blue light out of the modulated and polarized light of red light, that of green light, and that of blue light. The color synthesizer also has an optical characteristic such that the quantity of the polarized light of blue light outputted becomes largest out of the modulated and polarized light of red light, green light, and blue light.

Abstract: The present invention provides a projection image display technology capable of correcting astigmatism due to use of a polarized-beam splitter, thus ensuring high-resolution projection images. A wire-grid polarized-beam splitter (or the like) of a flat-plate-like structure is used as a polarized-beam splitter, and an astigmatism correction element, such as a cylindrical lens, is provided between the polarized-beam splitter and a projection lens unit.

Abstract: In a projection type image display apparatus, a projector optical unit for projecting an image onto a screen while magnifying a size of the image to be projected with respect to an original size of the image displayed by an image forming element, has a group of lenses for magnifying the size of the image with respect to the original size thereof, and an optical path extending from the image forming element to the screen to transmit the image along the optical path.

Abstract: A compact, light projection type image display apparatus based on reflection image display devices which provide high brightness without contrast deterioration caused by light leakage associated with black image display. The apparatus uses, as polarizers/analyzers for reflection image display devices, reflection polarizing plates which function as polarizing plates by their grating function only in a specific direction. In each light path, the reflection polarizing plate is located just before/after the reflection image display device.

Abstract: A quarter wavelength plate for reducing the dependence of a retardation value on an incident beam angle in optically anisotropic crystals. The quarter wavelength plate is formed of optically anisotropic crystals in a thickness of 0.1 mm to 0.5 mm. The quarter wavelength plate can contribute to a reduction in the dependence of the retardation value on the angle at which a light beam impinges on the quarter wavelength plate, and to a reduction in color shading caused by a rise in temperature. A reflection type liquid crystal display device which employs the quarter wavelength plate can enhance the luminance and contrast.

Abstract: A compact, light projection type image display apparatus based on reflection image display devices which provide high brightness without contrast deterioration caused by light leakage associated with black image display. The apparatus uses, as polarizers/analyzers for reflection image display devices, reflection polarizing plates which function as polarizing plates by their grating function only in a specific direction. In each light path, the reflection polarizing plate is located just before/after the reflection image display device.

Abstract: Disclosed is a compact, light, inexpensive reflection type liquid crystal projector optical unit or reflection type liquid crystal projector which provides high brightness without contrast deterioration caused by light leakage associated with black image display. The unit or projector uses, as a polarizer/analyzer for a reflection liquid crystal panel, a reflection polarizing plate which functions as a polarizing plate by its grating function only in a specific direction. It also uses an auxiliary polarizer and an absorption auxiliary analyzer. Their reflection axis or absorption axis is adjusted according to the characteristic of the reflection liquid crystal panel so as to minimize light leakage associated with black image display.

Abstract: An optical unit, comprising: a light source; a color separation means for separating a light emitted from the light source into plural pieces of color lights; reflection-type image display elements, upon each being incident the corresponding color of the lights from the color separation means, and for forming an optical image for each of the color lights, depending upon an image signal, with using polarization characteristics which the reflection-type image display elements have; and a color synthesizing means for synthesizing the optical images of the respective color lights, to be projected through a projection lens, enlargedly, and further comprising: a reflection-type polarization plate functioning as a polarization plate due to diffraction, being provided on an optical path extending from the color separation means to the reflection-type image display elements, to be a polarizer and an analyzer to the reflection-type image display elements; and an optical chassis for holding the reflection-type polarizat

Abstract: A quarter wavelength plate for reducing the dependence of a retardation value on an incident beam angle in optically anisotropic crystals. The quarter wavelength plate is formed of optically anisotropic crystals in a thickness of 0.1 mm to 0.5 mm. The quarter wavelength plate can contribute to a reduction in the dependence of the retardation value on the angle at which a light beam impinges on the quarter wavelength plate, and to a reduction in color shading caused by a rise in temperature. A reflection type liquid crystal display device which employs the quarter wavelength plate can enhance the luminance and contrast.

Abstract: A quarter wavelength plate for reducing the dependence of a retardation value on an incident beam angle in optically anisotropic crystals. The quarter wavelength plate is formed of optically anisotropic crystals in a thickness of 0.1 mm to 0.5 mm. The quarter wavelength plate can contribute to a reduction in the dependence of the retardation value on the angle at which a light beam impinges on the quarter wavelength plate, and to a reduction in color shading caused by a rise in temperature. A reflection type liquid crystal display device which employs the quarter wavelength plate can enhance the luminance and contrast.

Abstract: Disclosed is a compact, light, inexpensive reflection type liquid crystal projector optical unit or reflection type liquid crystal projector which provides high brightness without contrast deterioration caused by light leakage associated with black image display. The unit or projector uses, as a polarizer/analyzer for a reflection liquid crystal panel, a reflection polarizing plate which functions as a polarizing plate by its grating function only in a specific direction. It also uses an auxiliary polarizer and an absorption auxiliary analyzer. Their reflection axis or absorption axis is adjusted according to the characteristic of the reflection liquid crystal panel so as to minimize light leakage associated with black image display.