Abstract: Disclosed is a technique for quickly detecting a defect of a portion welded by laser beam welding. Specifically disclosed is a welding step in which a welding device is used, the welding device welding an object to be welded with a pulsed laser. In the welding step, a first photodetector receives only infrared rays having a wavelength allowing detection of a keyhole formed in a molten pool from among infrared rays radiating from a welded portion during the welding of the object, and an analyzer determines quality of the welded portion on the basis of intensity of the infrared rays received by the first photodetector.

Abstract: A polar functional group is added onto a surface of a metallic member. A resin member contains an adhesive functional group. The adhesive functional group and the polar functional group attract each other. A method for joining the metallic member and the resin member to each other includes: heating a junction between the metallic member and the resin member while pressing the metallic member and the resin member against each other with a first load; maintaining temperature of the junction higher than melting temperature of a resin that structures the resin member while pressing the metallic member and the resin member with each other with a second load smaller than the first load; and cooling the junction to temperature lower than the melting temperature while pressing the metallic member and the resin member against each other with a third load larger than the second load.

Abstract: A polar functional group is added onto a surface of a metallic member (1). A resin member (2) contains an adhesive functional group. The adhesive functional group and the polar functional group attract each other. A method for joining the metallic member (1) and the resin member (2) to each other includes a heating a junction between the metallic member (1) and the resin member (2) while pressing the metallic member (1) and the resin member (2) against each other with first load, maintaining temperature of the junction higher than melting temperature of a resin that structures the resin member (2) while pressing the metallic member (1) and the resin member (2) with each other with second load smaller than the first load, and cooling the junction to temperature lower than the melting temperature while pressing the metallic member and the resin member against each other with third load larger than the second load.

Abstract: Disclosed is a technique for quickly detecting a defect of a portion welded by laser beam welding. Specifically disclosed is a welding step in which a welding device is used, the welding device welding an object to be welded with a pulsed laser. In the welding step, a first photodetector receives only infrared rays having a wavelength allowing detection of a keyhole formed in a molten pool from among infrared rays radiating from a welded portion during the welding of the object, and an analyzer determines quality of the welded portion on the basis of intensity of the infrared rays received by the first photodetector.

Abstract: According to one embodiment, an electronic device including an image signal output module, a display, a lighting module, a driving module, and a shutter controller configured to control a timing of opening a first shutter which makes the first image viewable and a second shutter which makes the second image viewable alternately, according to a timing of the alternate output of the first image signal and the second image signal by the image signal output module, while providing a period of closing both of the first shutter and the second shutter.

Abstract: According to one embodiment, a stereoscopic video processor includes a mode setting module, an adjustment module, and a communication module. The mode setting module sets a mode from among a plurality of modes each specifying an adjustment amount related to the disparity between first stereoscopic video and second stereoscopic video. The adjustment module adjusts the disparity between the first stereoscopic video and the second stereoscopic video by an adjustment amount corresponding to the mode set by the mode setting module. The communication module communicates with stereoscopic glasses for viewing the first stereoscopic video and the second stereoscopic video the disparity between which is adjusted by the adjustment module.

Abstract: According to one embodiment, a stereoscopic video processor includes a mode setting module, an adjustment module, and a communication module. The mode setting module sets a mode from among a plurality of modes each specifying an adjustment amount related to the disparity between first stereoscopic video and second stereoscopic video. The adjustment module adjusts the disparity between the first stereoscopic video and the second stereoscopic video by an adjustment amount corresponding to the mode set by the mode setting module. The communication module communicates with stereoscopic glasses for viewing the first stereoscopic video and the second stereoscopic video the disparity between which is adjusted by the adjustment module.

Abstract: A projection video display apparatus includes an R light source, a G light source, and a B light source. DMD uses a video signal to modulate a beam generated by each of the R, G, and B light sources. A video beam obtained is projected on to a screen via a projecting optical lens. A control circuit controls driving of R, G, and B by a drive device, in a time division manner, within a unit period which is synchronous with the vertical synchronizing frequency of the video signal, the drive device drivingly turns on and off the light sources independently of one another. In this case, the ratio of irradiation times for R, G, and B is switched within the unit period depending on color temperature.

Abstract: This invention is applied to a projection video display apparatus which causes a DMA to modulate light from a light source having a plurality of two-dimensionally arrayed LEDs in accordance with a video signal and projects the modulated video light onto a screen via a projection optical lens. The two-dimensionally arrayed LEDs are sequentially turned off from outside to inside when a drive device for ON/OFF-driving the LEDs of the light source is designated to darken the light source. Alternatively, the two-dimensionally arrayed light-emitting elements are sequentially turned on from inside to outside when the drive device is designated to brighten the light source.

Abstract: The fast-axis and slow-axis direction components of light exited from any light emitting sections are respectively independently collimated to allow the light beams which are collimated in both the fast-axis and slow-axis directions to be shaped and/or image-converted to a predetermined cross-sectional configuration at least relative to the slow-axis direction components and allow the light beams which are given the predetermined cross-sectional configuration to be condensed to a predetermined position. By doing so it is possible to reduce any loss involved upon the optical coupling of a laser array to an optical fiber.

Abstract: A semiconductor laser module comprising a semiconductor laser device, a collimating section collimating a laser beam emitted from the semiconductor laser device, a beam shaping section parallel-shifting at least part of a laser beam emitted from the collimating section to a position satisfying an effective numerical aperture of the optical fiber cable when the laser beam exceeds the effective numerical aperture of the optical fiber cable, and a collecting section collecting a laser beam emitted from the beam shaping section onto a light incident end face of the optical fiber cable.

Abstract: A spot size converter comprising an incident area of a first size, an exit area of a second size different from the first size, and side walls defining a light guide, wherein at least a part of side wall inclines from the width direction axis and the thickness direction axis of the incident area is provided. Thereby, it is able to regulate the divergence of the outgoing light, and to optically couple optical elements of different spot size with each other at a high-efficiency. Moreover, the semiconductor laser module and optical fiber laser device using such a spot size converter are provided.

Abstract: Light from a first excitation light source is incident on one facet of a first optical fiber. A core is doped with a first rare earth substance. A resonant section induces light resonance in the core to generate resonant light, thereby providing selected light at the other facet of the first optical fiber. An optical multi/demultiplexer reflects the light of the selected wavelength in a direction different from that of the first optical fiber. A second excitation light source supplies light to the resonant section of the first optical fiber via the optical multi/demultiplexer and the other facet of the first optical fiber. A second optical fiber guides the light of the selected wavelength from the optical multi/demultiplexer to an exterior.

Abstract: A video display unit according to the present invention uses a plurality of semiconductor lasers as one light source. The unit lowers all laser outputs when lowering the brightness of the semiconductor lasers and realizes a long life, and stops one of the semiconductor lasers when realizing a low power consumption mode. Thus, a long life is realized when lowering all laser outputs, and a low power consumption is realized when stopping some semiconductor lasers.

Abstract: A semiconductor laser module comprising, a semiconductor laser element, an electronic cooling element configured to allow heat from the semiconductor laser element to be transmitted thereto, a heat sink configured to allow the heat which is transmitted to the electronic cooling element to be released, an optical system configured to conduct a laser beam which is emitted from the semiconductor laser element to an optical fiber cable, and a heat resistance section configured to transmit the heat of the optical system to the electronic cooling element, having a heat resistance greater than a heat resistance when the heat of the semiconductor laser element is transmitted to the electronic cooling element.

Abstract: A laser apparatus comprises a semiconductor laser element which emits a light beam with a spread in a slow-axis direction and a fast-axis direction, a fast-axis collimating lens which controls the spread in the fast-axis direction of the light beam emitted from the semiconductor laser element, a reflector which returns the light beam emitted in the slow-axis direction in a specific angle range to the semiconductor laser element, a reflector supporting member which supports the reflector, and a side support member which supports the fast-axis collimating lens and the reflector supporting member in the slow-axis direction with respect to the semiconductor laser element.

Abstract: Among light emitted from a semiconductor laser, light emitted within a predetermined angle &thgr;x with respect to the z-axis in the direction of the slow axis (x-axis) is returned by a plane mirror to the semiconductor laser to enhance the intensity of the laser light emitted by the semiconductor device using external resonance.

Abstract: Rays of light emitted from the semiconductor laser are converted into parallel rays of light by cylindrical lenses. Then, the light passed through the cylindrical lenses is caused to enter an optical fiber changed continuously from a specific position in the middle toward an incidence end part in such a manner that the core shape at the incidence end part becomes elliptic, with the cross-sectional area remaining unchanged.

Abstract: A superfinishing method of a tapered roller bearing, including the steps of: rotating an outer ring of the tapered roller bearing about a center axis thereof; inserting a straight-shaped superfinishing stone from a front face of outer ring; and slidingly contacting a leading end face of the superfinishing stone with a taper-shaped raceway surface formed in an inner peripheral surface of the outer ring to thereby superfinish the raceway surface. The superfinishing stone is inclined outwardly of the front face of outer ring with respect to a vertical line of the raceway surface.

Abstract: Light from a first excitation light source is incident on one facet of a first optical fiber. A core is doped with a first rare earth substance. A resonant section induces light resonance in the core to generate resonant light, thereby providing selected light at the other facet of the first optical fiber. An optical multi/demultiplexer reflects the light of the selected wavelength in a direction different from that of the first optical fiber. A second excitation light source supplies light to the resonant section of the first optical fiber via the optical multi/demultiplexer and the other facet of the first optical fiber. A second optical fiber guides the light of the selected wavelength from the optical multi/demultiplexer to an exterior.