Abstract: A method of detecting a scanning angle range of a laser beam of a laser projector is provided. First, a photo sensor is disposed between first and second positions on a projection mirror. Then, a laser beam emitted from the laser projector scans back and forth between the first and second positions, so that the photo sensor receives the laser beam sequentially at first and second scanning time points to generate first and second sensing signals, respectively. If an actual time interval between the first and second sensing signals conforms to an expected time interval, an actual scanning angle range of the laser beam is determined as normal. If the actual time interval does not conform to the expected time interval, the actual scanning angle range of the laser beam is determined as abnormal and the laser projector stops emitting the laser beam. A laser projector is also provided.

Abstract: An optical projection system for projecting an enlarged image on a projection surface is provided. The optical projection system includes an image forming element, a coaxial optical system and a concave mirror. The coaxial optical system and the concave mirror are arranged in this order on an optical path from the image forming element to the projection surface. The coaxial optical system includes lens groups and an aperture stop that share an optical axis. The lens groups include a first lens group and other lens groups. The first lens group has negative refractive power and independently moves in an optical axis direction for adjusting the focus of the optical projection system. The aperture stop is arranged at a position closer to the image forming element than the first lens group that is arranged closest to the concave mirror among the lens groups having the negative refractive power.

Abstract: A projector optical system is provided, the system including an illumination unit including illumination lenses illuminating light downwards, a display device receiving light illuminated from the illumination lenses to enable to realize an image, projection lenses downwardly projecting light emitted from the display device to a screen, and a field lens changing an optical angle of the light illuminated from the illumination lenses and emitting the light to the display device, and changing an optical angle by receiving an image light of the display device and emitting the light to the projection lenses.

Abstract: An illumination unit includes a plurality of light sources each including a solid-state light-emitting device configured to emit light from a light emission region including a single or a plurality of light-emitting spots. The solid-state light-emitting device includes a single chip or a plurality of chips each emitting light beam. Three or more of the light-emitting spots are provided within the whole light sources, to allow the whole light sources to emit light beams in two or more wavelength bands different from one another. Two or more of the plurality of the light sources include respective light-emitting spots which emit light in the same wavelength band.

Abstract: A projector is provided with: an input line memory which holds an input image signal corresponding to one line; an image processor which generates an intermediate image signal correction-processed according to distortion of a projection lens, using the input image signal transferred from the input line memory; an output line memory which holds the intermediate image signal corresponding to one line; and an LCOS which guides light radiated from a light source to the projection lens in accordance with the intermediate image signal. The image processor is provided with an input supplementation buffer which stores the input image signals of a plurality of lines, an input data buffer which stores input image signals required to generate the intermediate image signal corresponding to one line, and a number-of-supplementary-lines calculator which calculates the number of supplementary lines of the input image signals.

Abstract: A polarization optical apparatus including a reflection-type polarization element for transmitting a predetermined polarization component light. A slidably supported reflection-type optical modulation element is held by a holding member that includes a sliding support surface for slidably supporting the reflection-type polarization element. The reflection-type polarization element is urged toward the sliding support surface while the reflection-type polarization element is enabled to be slid along the sliding support surface.

Abstract: An image projecting apparatus for projecting an image includes a light source, a light emitting port, an emitting unit, and a control unit. The emitting unit causes the light emitted from the light source to be emitted from the light emitting port in such a manner that an emission direction of the light emitted from the light emitting port is variable. The control unit controls the light source and the emitting unit to switch between a first projection mode and a second projection mode. When the image projecting apparatus is placed on a horizontal plane, the emission direction is a front direction of the light emitting port or obliquely upward with respect to the horizontal plane in the first projection mode, and the emission direction is obliquely downward with respect to the horizontal plane in the second projection mode.

Abstract: A projection image area detecting device includes a projection image area detecting unit configured to detect marker image areas in a photographed image that is obtained by photographing a projection image area including a projection image. The marker image areas include marker images that are used for identifying four corners of the projection image area. The projection image area detecting unit detects the marker image areas by identifying a color included in the marker image areas that continues to change as time passes.

Abstract: A light source device includes: a first light source (3a) that emits first polarized light of a plurality of colors including different wavelengths; a second light source (3b) that emits second polarized light whose polarization state differs from that of the first polarized light and that includes light of at least one color from among the plurality of colors; and a first color synthesis optical element (1) that synthesizes the first polarized light emitted from the first light source (3a) and the second polarized light emitted from the second light source (3b).

Abstract: A projector includes a light source that emits excitation light, a fluorescent body that converts the excitation light into fluorescence, a liquid crystal optical modulation device that modulates light output from the fluorescent body, an optical sensor that detects at least one of the excitation light passing through the fluorescent body and the fluorescence converted by the fluorescent body, and a control device that controls at least one of the light source and the liquid crystal optical modulation device based on a detection result of the optical sensor.

Abstract: A light source device includes: an arc tube having a light emission portion containing a pair of electrodes and configured to emit light by discharges induced between the pair of the electrodes; and a container body that accommodates the arc tube, the container body has a space in which the arc tube is accommodated, and a plurality of openings through that cooling fluids introduced from the outside of the container body are supplied into the space, the plural openings are formed at positions that allow the cooling fluids passing through the openings to collide with each other at a collision position above the light emission portion.

Abstract: A projector for projecting an image light including: a laser light source for emitting a laser beam; a light modulator for modulating the laser beam to generate the image light; a projection portion for projecting the image light; a detector for detecting a fixation degree of the projector; and a controller for controlling the power of the image light on the basis of the fixation degree.

Abstract: A projection optical system which, when projecting an image of an optical modulator onto a projection surface on an enlarged scale, differs the aspect ratio of the image of the optical modulator and the aspect ratio of the image projected onto the projection surface, and includes, in order from the projection surface, a first group which is an enlargement optical system; a second group includes an adjustment optical component with a surface rotationally asymmetrical to an optical axis, when defining at least one direction of the vertical direction and the horizontal direction of the optical modulator as an adjustment direction in which conversion adjustment using compression or extension is performed, the adjustment optical component having at least one optical system which differs in power between the adjustment direction and another direction; and a third group which has a correction optical component with a surface rotationally symmetrical to the optical axis.

Abstract: A projection display having at least one light source and also regularly-disposed optical channels. The optical channels comprise at least one field lens, to which respectively one object structure to be imaged and also at least one projection lens are assigned. The distance of the projection lenses from the assigned object structures corresponds to the focal distance of the projection lenses while the distance of the object structures to be imaged from the assigned field lens is chosen such that a Köhler illumination of the assigned projection lens is made possible. Then the individual projections are superimposed to form the total image.

Abstract: A high-pressure discharge lamp comprising an arc tube, the arc tube including: a light-emitting part which is substantially ellipsoidal; and sealing parts which extend from either end of the light-emitting part and in which bases of electrodes are sealed, the arc tube enclosing 0.2 mg/mm3 to 0.4 mg/mm3 of mercury, the high-pressure discharge lamp having a power rating greater than 355 W and not greater than 600 W, wherein 5.4?D?5.8 and 3.1?X?D?2.3 when 355<P?380, 5.8?D?6.2 and 3.1?X?D?2.7 when 380<P?450, and 6.2?D?6.6 and 3.1?X?D?3.3 when 450<P?600, where P denotes the power rating in watts of the high-pressure discharge lamp, D denotes an inside diameter in millimeters of the light-emitting part 104 with reference to a midpoint between the electrodes 101, and X denotes a wall thickness in millimeters of the light-emitting part 104 with reference to the midpoint between the electrodes 101.

Abstract: The polarization beam splitting element splits an entering beam according to polarization directions. The element includes, in order from a beam entrance side, an entrance side multi-layered film layer constituted by laminated multiple dielectric films, and a one-dimensional grating structure having a grating period smaller than a wavelength of the entering beam and formed of a metal. When a medium existing on the beam entrance side further than the entrance side multi-layered film layer is referred to as an entrance medium, the multiple dielectric films constituting the entrance side multi-layered film layer include at least one dielectric film having a higher refractive index than that of the entrance medium and at least one dielectric film having a lower refractive index than that of the entrance medium.

Abstract: A thermal management device (401) is provided which comprises a synthetic jet actuator (403) and a heat sink (405) comprising a fin (407). The fin has at least one interior channel (409) defined therein which has first and second openings that are in fluidic communication with each other. The synthetic jet actuator is adapted to direct a synthetic jet into said channel.

Abstract: An illumination unit includes a plurality of light sources each including a solid-state light-emitting device configured to emit light from a light emission region including a single or a plurality of light-emitting spots. The solid-state light-emitting device includes a single chip or a plurality of chips each emitting light beam. Three or more of the light-emitting spots are provided within the whole light sources, to allow the whole light sources to emit light beams in two or more wavelength bands different from one another. Two or more of the plurality of the light sources include respective light-emitting spots which emit light in the same wavelength band.

Abstract: An optical projection system for projecting an enlarged image on a projection surface is provided. The optical projection system includes an image forming element, a coaxial optical system and a concave mirror. The coaxial optical system and the concave mirror are arranged in this order on an optical path from the image forming element to the projection surface. The coaxial optical system includes lens groups and an aperture stop that share an optical axis. The lens groups include a first lens group and other lens groups. The first lens group has negative refractive power and independently moves in an optical axis direction for adjusting the focus of the optical projection system. The aperture stop is arranged at a position closer to the image forming element than the first lens group that is arranged closest to the concave mirror among the lens groups having the negative refractive power.

Abstract: Disclosed herein is a color display device that can be deployed at retail paint stores, kiosks, customers' offices or homes, airports, malls, etc. for rapid color and appearance prototyping. The color display device, which can be mobile, can display color under standardized lighting or simulated ambient lighting. The color display device can augment or replace a traditional paint chip rack or fan deck. The color display device can manipulate light sources additively and/or subtractively using an integrating light mixing capsule or chamber, special optics, mock objects and electronic control for color and appearance representation and for object illumination with desirable simulated ambient lighting.