Abstract: A photodetector measures flight time by an imaging optical element imaging reflected light from an illuminated illumination region of an object illuminated by pulse light, and a light detection portion receiving the imaged light. The light detection portion is formed larger than a projection region reflected at the illumination region of the object and imaged on the light detection portion. In the light detection portion, a portion overlaying the projection region is activated as a light-detection region.

Abstract: [Object] To provide (i) a two-lens optical system, (ii) a beam combining module, (iii) a projector, and (iv) a method for assembling a two-lens optical system each of which allows for an improved lens positioning sensitivity [Means to Attain the Object] A two-lens optical system (100) includes a first lens (1) for use in collimation adjustment, the first lens being configured to move along only an optical axis of light emitted from a light source; and a second lens (2) for use in beam steering, the second lens being configured to move along only two axes perpendicular to the optical axis.

Abstract: A pulsed light emitting element emits pulsed light that is linearly polarized in a first polarization direction, the pulsed light passes through a polarizing beam splitter and a lens in this order and is radiated onto a target object, reflected light passes through the lens and the polarizing beam splitter in this order, is linearly polarized in a second polarization direction that is different from the first polarization direction, and is concentrated on a light receiving element, the pulsed light emitting element and the light receiving element are provided on a focal plane of the lens, and the optical axis of the pulsed light and the optical axis of the reflected light overlap.

Abstract: A beam combining module combines a first beam corresponding to a first wavelength and a second beam corresponding to a second wavelength. The beam combining module includes a collimating lens, a first mirror, and second mirror. The collimating lens is configured to receive the first beam and the second beam that are parallel to each other and to emit the first beam and the second beam in respective non-parallel directions. The first mirror is configured to reflect the first beam emitted by the collimating lens. The second mirror is configured to reflect the second beam emitted by the collimating lens in a direction parallel to the first beam reflected by the first mirror and in such a manner that the second beam emitted by the collimating lens spatially overlaps the first beam reflected by the first mirror.

Abstract: In a light source module A, a lens shapes emitted light 1a of a semiconductor laser. A plate on which the lens is disposed has a through hole through which the emitted light of the semiconductor laser passes and an adjustment surface that is used for adjusting the position of the lens with respect to the through hole in a direction perpendicular to the optical axis L of the semiconductor laser. An end surface 5b of the lens that is opposite to an optical light-emitting surface of the lens is fixed to the adjustment surface with an adhesive AD. A stepped portion that is recessed in the direction of the optical axis L is formed in a bonding portion in which the end surface of the lens and the adjustment surface are bonded together.

Abstract: To provide (i) a two-lens optical system, (ii) a beam combining module, (iii) a projector, and (iv) a method for assembling a two-lens optical system each of which allows for an improved lens positioning sensitivity [Means to Attain the Object] A two-lens optical system (100) includes a first lens (1) for use in collimation adjustment, the first lens being configured to move along only an optical axis of light emitted from a light source; and a second lens (2) for use in beam steering, the second lens being configured to move along only two axes perpendicular to the optical axis.

Abstract: A projector apparatus includes a projection unit that projects an image on a projection target, a distance-measuring unit that measures a distance from an emitting end of the projection unit to the projection target, and a control unit that sets a luminance of projection light to a predetermined constant value when a distance measured by the distance-measuring unit is equal to or smaller than a predetermined distance and increases the luminance of the projection light such that the luminance does not exceed a set luminance of the projection light corresponding to the measured distance when the distance measured by the distance-measuring unit is larger than the predetermined distance.

Abstract: A battery pack provided with a battery core pack having a plurality of battery cells held by a holding part of a cell holder, and a case for accommodating the battery core pack. The cell holder has a peripheral wall part surrounding the holding part. A plurality of slits extending along the peripheral direction on an end surface of the peripheral wall part are provided to the peripheral wall part.

Abstract: An embodiment of the present invention enables an improvement in image resolution. A projection device (1) includes: a light source (11); a MEMS mirror (14) which reflects and two-dimensionally scans the laser beam emitted from the light source; and a free-form lens (15) which changes focusing properties of the laser beam reflected by the scanning section such that, after propagation of the laser beam to a screen (20) onto which the image is to be projected, a shape of the laser beam when viewed on the screen has a first width that is shorter than a second width of the shape, the first width being along a horizontal direction corresponding to a primary scanning direction in which the MEMS mirror scans the laser beam, the second width being along a vertical direction.

Abstract: A battery pack provided with a battery core pack having a plurality of battery cells held by a holding part of a cell holder, and a case for accommodating the battery core pack. The cell holder has a peripheral wall part surrounding the holding part. A plurality of slits extending along the peripheral direction on an end surface of the peripheral wall part are provided to the peripheral wall part.

Abstract: In a light source module A, a lens shapes emitted light 1a of a semiconductor laser. A plate on which the lens is disposed has a through hole through which the emitted light of the semiconductor laser passes and an adjustment surface that is used for adjusting the position of the lens with respect to the through hole in a direction perpendicular to the optical axis L of the semiconductor laser. An end surface 5b of the lens that is opposite to an optical light-emitting surface of the lens is fixed to the adjustment surface with an adhesive AD. A stepped portion that is recessed in the direction of the optical axis L is formed in a bonding portion in which the end surface of the lens and the adjustment surface are bonded together.

Abstract: An embodiment of the present invention enables an improvement in image resolution. A projection device (1) includes: a light source (11); a MEMS mirror (14) which reflects and two-dimensionally scans the laser beam emitted from the light source; and a free-form lens (15) which changes focusing properties of the laser beam reflected by the scanning section such that, after propagation of the laser beam to a screen (20) onto which the image is to be projected, a shape of the laser beam when viewed on the screen has a first width that is shorter than a second width of the shape, the first width being along a horizontal direction corresponding to a primary scanning direction in which the MEMS mirror scans the laser beam, the second width being along a vertical direction.

Abstract: A housing provided to a light source device has a sliding surface to which a first lens portion is fixed and an inclined support surface to which a second lens portion is fixed. The sliding surface is vertical to a direction of an optical axis of a semiconductor laser and wider than a first fixing surface of the first lens portion that is fixed to the sliding surface. The inclined support surface is parallel to the direction of the optical axis and wider than a second fixing surface of the second lens portion that is fixed to the inclined support surface.

Abstract: A one-way valve includes a housing with a center axis. The housing includes a peripheral side wall around the center axis, and an inward flange protruding from the peripheral side wall toward the center axis. A valve member is inserted into the housing and includes an outer peripheral surface around the center axis, and an outward flange protruding from the outer peripheral surface toward the peripheral side wall. A coil spring includes a first axial end having a first diameter and being in contact with the inward flange and the peripheral side wall, a second axial end having a second diameter smaller than a first diameter, the second axial end being in contact with the outward flange and the outer peripheral surface, and a body portion provided between the first axial end and the second axial end and having diameters decreasing from the first diameter to the second diameter.

Abstract: A laser light source device includes a plurality of semiconductor laser elements, an optical coupling element that couples together a plurality of laser beams that are emitted from the plurality of semiconductor laser elements, and a plurality of apertures, each provided between a corresponding one of the semiconductor laser elements and the optical coupling element, that correspond to the plurality of semiconductor laser elements, respectively. The plurality of apertures are set so that aperture diameters of the plurality of apertures become smaller as wavelengths of laser beams that pass through the respective apertures become shorter.

Abstract: A photodetector measures flight time by an imaging optical element imaging reflected light from an illuminated illumination region of an object illuminated by pulse light, and a light detection portion receiving the imaged light. The light detection portion is formed larger than a projection region reflected at the illumination region of the object and imaged on the light detection portion. In the light detection portion, a portion overlaying the projection region is activated as a light-detection region.

Abstract: A pulsed light emitting element emits pulsed light that is linearly polarized in a first polarization direction, the pulsed light passes through a polarizing beam splitter and a lens in this order and is radated onto a target object, reflected light passes through the lens and the polarizing beam splitter in this order, is linearly polarized in a second polarization direction that is different from the first polarization direction, and is concentrated on a light receiving element, the pulsed light emitting element and the light receiving element are provided on a focal plane of the lens, and the optical axis of the pulsed light and the optical axis of the reflected light overlap.

Abstract: A housing provided to a light source device has a sliding surface to which a first lens portion is fixed and an inclined support surface to which a second lens portion is fixed. The sliding surface is vertical to a direction of an optical axis of a semiconductor laser and wider than a first fixing surface of the first lens portion that is fixed to the sliding surface. The inclined support surface is parallel to the direction of the optical axis and wider than a second fixing surface of the second lens portion that is fixed to the inclined support surface.

Abstract: A light beam separating and absorbing element includes a mirror that receives first and second light beams incident on a first surface, and the mirror is configured to transmit the first light beam and reflect the second light beam. A beam absorber receives the first light beam transmitted through the mirror, and absorbs a first light portion of the transmitted first light beam after the first light beam has been transmitted through the mirror. The beam absorber scatters a second portion of the first light beam, and the beam absorber and mirror are positioned such that at least a portion of the scattered light is incident on a second surface of the mirror. Transmissivity of the mirror for the scattered light incident on the second mirror surface may be lower as compared to transmissivity for the first light beam incident on the first mirror surface to enhance separation of the first and second light beams.

Abstract: A light beam separating and absorbing element includes a mirror that receives first and second light beams incident on a first surface, and the mirror is configured to transmit the first light beam and reflect the second light beam. A beam absorber receives the first light beam transmitted through the mirror, and absorbs a first light portion of the transmitted first light beam after the first light beam has been transmitted through the mirror. The beam absorber scatters a second portion of the first light beam, and the beam absorber and mirror are positioned such that at least a portion of the scattered light is incident on a second surface of the mirror. Transmissivity of the mirror for the scattered light incident on the second mirror surface may be lower as compared to transmissivity for the first light beam incident on the first mirror surface to enhance separation of the first and second light beams.