Abstract: A light source device (411) has a lamp body (411A) including a light source lamp, a reflector (417) and an anti-explosion glass (418), and a lamp housing (411B) for accommodating the lamp body (411A). A plurality of projections (411B8) protruding along an optical axis of a light beam irradiated by the light source lamp are formed on the lamp housing (411B). Further, the reflector (417) has an approximately concave cross section and a positioning surface (417C) that touches the projections (411B8) of the lamp housing (411B) to locate the lamp body (411A) relative to the lamp housing (411B) is provided on a distal side of the concave section. The positioning surface (417C) is continuously flush.

Abstract: The invention provides an optical filter, an optical device, and a projector, which make it possible to project a high-quality image by reducing or preventing color unevenness of the projected image. An optical filter is used in a projector that includes liquid crystal panels to modulate light beams from a light source (lamp) in accordance with image information to form optical images. The optical filter is disposed downstream from the liquid crystal panels in a light path, and includes a substrate and an optical conversion film. The optical conversion film is disposed on a light-incident surface of the substrate and includes two types of thin films having different refractive indices and being alternately stacked. The optical conversion film becomes continuously thinner from one end to the other end of the optical conversion film, so that it is inclined with respect to the substrate.

Abstract: A projector includes a light source, a color separating optical system, liquid crystal panels, a cross dichroic prism, and a projection lens, in which an optical filter is disposed to reflect a predetermined spectral component in the light flux between a dichroic mirror and a dichroic mirror where an angle by which the light flux expands falls within 20° with respect to an illumination optical axis L of the light flux on an optical path from the light source device to a light flux-emitting surface of the projecting lens. Thus, carrying out spectrum correction can reduce or prevent the contrast degradation of the projected image. Furthermore, it allows the difference of an incident angle to the light flux-incident surface of the light flux to be smaller, thereby reducing color unevenness.

Abstract: A polarizing conversion element array (500) of a polarization converter (414) has two polarizing conversion elements (510) provided with a polarization separating film (511) for separating a light beam into two linearly polarization beams and a reflecting film (512) that reflects one of the linearly polarization beams separated by the polarization separating film (511) in an alternate manner, the two polarizing conversion elements (510) being arranged so that the respective polarization separating films (511) and the reflecting films (512) are opposed, the polarization converter (414) being constructed by adhering a retardation plate (600) on a light-irradiation side of the polarizing conversion element array (500) stretching over the two polarizing conversion elements (510).

Abstract: A distributed amplifier with a simple structure that permits miniaturization of circuit in which the input-side transmission line of the distributed amplifier is constituted by a coplanar line having a signal line and a ground face formed on the upper face of a dielectric substrate and the output-side transmission line of the distributed amplifier is constituted by a microstrip line having a signal line formed on the upper face of the dielectric substrate and a ground face formed on the lower face of the dielectric substrate. In addition, a plurality of amplification transistors is formed on the upper face of the dielectric substrate and each of the electrodes is connected to the signal line or the ground face that is formed on the upper face of the dielectric substrate. Because a large transistor-drive current does not flow to the input-side transmission line, the signal line can be made narrow and there is no increase in the required surface area even in the case of a coplanar line.

Abstract: In an optical device (44), an optical axis (A) of a projection lens (46) is shifted relative to a central axis (C) of an image formation area of a liquid crystal panel (441), and a central axis (B) of a light-incident side of the cross dichroic prism (444) is shifted relative to a central axis (C) of the image formation area of a liquid crystal panel (441) to be located between the optical axis (A) of the projection lens (46) and the central axis (C) of the image formation area of the liquid crystal panel (441).

Abstract: A projector includes a light source, a beam splitter for splitting a light irradiated from the light source into a plurality of partial light beams, a polarization converter for converting the light beam irradiated from the beam splitter into a predetermined linear polarization light beam, and a lens array for transmitting the plurality of partial light beams irradiated from the polarization converter to a light modulator, where the polarization converter and the lens array are integrated by a holding frame and are fixed to a fixing portion of a support, so that the polarization converter and the lens array can be attached to the fixing portion of the support while adjusting position of the integrated component relative to the fixing portion, thus reducing trouble for position adjustment.

Abstract: A polarization converter (414) has polarizing conversion element body (414B) including: a polarization separating film (511) that separates an incident light into two linearly polarization beam; a reflecting film (512) alternately disposed between the polarization separating films (511), the reflecting film reflecting a linearly polarization beam reflected by the polarization separating film (511); a sheet glass (513) provided with the polarization separating film (511) and the reflecting film (512); and a retardation plate (600) that converts a polarization axis of the linearly polarization beam transmitted through the polarization separating film (511), a fixing frame (414A) that shields incident light beam on a position on the light-incident side of the polarizing conversion element body (414B) not opposing to the polarizing conversion element body (414B), the fixing frame (414A) having a holder that holds an end of the polarizing conversion element body (414B) and a fixing portion to be fixed to an inner

Abstract: A projector includes a light source, a beam splitter for splitting a light irradiated from the light source into a plurality of partial light beams, a polarization converter for converting the light beam irradiated from the beam splitter into a predetermined linear polarization light beam, and a lens array for transmitting the plurality of partial light beams irradiated from the polarization converter to a light modulator, where the polarization converter and the lens array are integrated by a holding frame and are fixed to a fixing portion of a support, so that the polarization converter and the lens array can be attached to the fixing portion of the support while adjusting position of the integrated component relative to the fixing portion, thus reducing trouble for position adjustment.

Abstract: A projector includes a light source, a color separating optical system, liquid crystal panels, a cross dichroic prism, and a projection lens, in which an optical filter is disposed to reflect a predetermined spectral component in the light flux between a dichroic mirror and a dichroic mirror where an angle by which the light flux expands falls within 20° with respect to an illumination optical axis L of the light flux on an optical path from the light source device to a light flux-emitting surface of the projecting lens. Thus, carrying out spectrum correction can reduce or prevent the contrast degradation of the projected image. Furthermore, it allows the difference of an incident angle to the light flux-incident surface of the light flux to be smaller, thereby reducing color unevenness.

Abstract: A light source device (411) has a lamp body (411A) including a light source lamp, a reflector (417) and an anti-explosion glass (418), and a lamp housing (411B) for accommodating the lamp body (411A). A plurality of projections (411B8) protruding along an optical axis of a light beam irradiated by the light source lamp are formed on the lamp housing (411B). Further, the reflector (417) has an approximately concave cross section and a positioning surface (417C) that touches the projections (411B8) of the lamp housing (411B) to locate the lamp body (411A) relative to the lamp housing (411B) is provided on a distal side of the concave section. The positioning surface (417C) is continuously flush.

Abstract: A projector includes a light source, a beam splitter for splitting a light irradiated from the light source into a plurality of partial light beams, a polarization converter for converting the light beam irradiated from the beam splitter into a predetermined linear polarization light beam, and a lens array for transmitting the plurality of partial light beams irradiated from the polarization converter to a light modulator, where the polarization converter and the lens array are integrated by a holding frame and are fixed to a fixing portion of a support, so that the polarization converter and the lens array can be attached to the fixing portion of the support while adjusting position of the integrated component relative to the fixing portion, thus reducing trouble for position adjustment.

Abstract: A liquid crystal device is provided including an exit side substrate portion, an entrance side substrate portion opposed to the exit side substrate portion, and a liquid crystal layer placed between the exit side substrate portion and the entrance side substrate portion. The exit side substrate portion includes an exit side substrate on which a first electrode for driving the liquid crystal layer is formed, and an exit side cover arranged on the exit side with respect to the exit side substrate. The entrance side substrate portion includes an entrance side substrate on which a second electrode for driving the liquid crystal layer is formed, and an entrance side cover arranged on the entrance side with respect to the entrance side substrate. The absolute value of the coefficient of thermal expansion of the exit side cover is less than 37×10−7/° C., and more preferably not more than 10×10−7/° C.

Abstract: A circuit for and a method of driving the liquid crystal panel of a liquid crystal projector make it possible to manufacture a projector having a plurality of light sources inexpensively. The circuit for driving the liquid crystal panel of a liquid crystal projector having a plurality of lamps as light sources has a CPU circuit for managing the overall system and data of the liquid crystal projector, a video signal processing circuit for converting a video signal input from an external source into a digital signal, and a panel correcting circuit for correcting the digital video signal generated by the video signal processing circuit depending on characteristics of a liquid crystal panel of the liquid crystal projector so as to match the liquid crystal panel. The CPU circuit outputs corrective data to the panel correcting circuit depending on how the lamps are energized, and the panel correcting circuit corrects the video signal using the corrective data.

Abstract: A distributed amplifier having a plurality of cascode amplifying circuits, and which causes little deterioration of the output waveform. In a preferred embodiment, the source potentials of the source-grounded transistors of the respective amplifying circuits are set individually. The source potentials of none or one or more of the source-grounded transistors are set at +0.8 volts, and the source potentials of the remaining source-grounded transistors are set at zero volts. The voltage gain of the source-grounded transistors whose source potential is +0.8 volts is zero, so that these source-grounded transistors do not contribute to the voltage gain of the amplifier as a whole. The source-grounded transistors whose source potential is zero volts contribute to the voltage gain, and output an amplified signal with a good waveform. The magnitude of the voltage gain can be adjusted by setting the number of source-grounded transistors whose source potential is zero volts.

Abstract: To provide an optical filter, an optical device, and a projector, which make it possible to project a high-quality image by preventing color unevenness of the projected image. An optical filter 500 is used in a projector comprising liquid crystal panels for modulating light beams from a light source (lamp) in accordance with image information to form optical images. The optical filter 500 is disposed downstream from the liquid crystal panels in a light path, and comprises a substrate 510 and an optical conversion film 520. The optical conversion film 520 is disposed on a light-incident surface of the substrate 510 and comprises two types of thin films 521 and 522 having different refractive indices and being alternately stacked. The optical conversion film 520 becomes continuously thinner from one end 520A to the other end 520B of the optical conversion film 520, so that it is inclined with respect to the substrate 510.

Abstract: In an optical device (44), an optical axis (A) of a projection lens (46) is shifted relative to a central axis (C) of an image formation area of a liquid crystal panel (441), and a central axis (B) of a light-incident side of the cross dichroic prism (444) is shifted relative to a central axis (C) of the image formation area of a liquid crystal panel (441) to be located between the optical axis (A) of the projection lens (46) and the central axis (C) of the image formation area of the liquid crystal panel (441).

Abstract: A liquid crystal display device is provided which is capable of reducing flicker over all areas of a liquid crystal panel. A common voltage having a predetermined level is fed to the liquid crystal panel and a reference voltage is fed from a digital-analog converter to a liquid crystal driving circuit and an image corresponding to a pixel data signal is displayed. The pixel data signal is reversed relative to a reference voltage for every one horizontal period. The reference voltage having been adjusted so as to be higher in side portions rather than central portions in the liquid crystal panel is applied to the liquid crystal driving circuit. As a result, even if a common voltage is not made uniform through entire portions of a common electrode, adjustment can be achieved so that flicker is minimized over all areas in the liquid crystal panel.

Abstract: A projection-type display apparatus in accordance with the invention reduces the margin formed around the image forming range of the light valves, and forms a bright projected image. Emitted light from a light source lamp unit of a projection-type display apparatus illuminates liquid crystal light valves of each color via an integrator optical system. First and second lens plates of an integrator optical system that serves as a uniform illuminating optical system are disposed such that the attachment position thereof is capable of fine adjustment in a direction vertical to the optical axis. By performing fine adjustment of the attachment position of these, the forming position of the illumination range B can be adjusted to include the image forming range A of the liquid crystal light valves. Accordingly, there is no need to provide a wide margin around the image forming range A, taking shifting of the forming position of the illumination range B into consideration.

Abstract: Two polarization conversion element arrays are disclosed. Each polarization conversion element array is composed of a plurality of polarization conversion elements for converting light incident upon the polarization conversion element array to a linearly polarized light beam with a predetermined polarization direction. The plurality of polarization conversion elements are disposed opposite to each other with a predetermined space provided between at about the center of the light-outgoing surface of a lens array in the direction of arrangement. Of the light beams (s-polarized+p-polarized light beams) gathered by the lens array, light beam that is not incident upon the polarization conversion element and passes through the predetermined space is a light beam including a predetermined polarized light beam (s-polarized light beam) that is primarily made to leave the array 320a and an ineffective polarized light beam (p-polarized light beam).