Abstract: A scanning laser radar comprises a transmitting unit comprising a laser and a first lens; a receiving unit comprising a second lens and a light sensor; an actuating unit, wherein the laser and the light sensor are located on the actuating unit, the actuating unit carries and moves with the laser and the light sensor.

Abstract: A polarizing beam splitter comprises a main body. The main body includes a first side surface, a second side surface, a plurality of light emitting surfaces, a plurality of splitting surfaces, and a plurality of polarized beam splitter films. The second side surface is parallel to the first side surface. The plurality of light emitting surfaces is perpendicular to and connected between the first side surface and the second side surface. The light emitting surfaces are “N” in number. Each splitting surface is parallel to the others and is inclined towards the second side surface. The splitting surfaces are also “N” in number. The plurality of polarized beam splitter films are attached to the plurality of splitting surfaces, and have different reflectivities to S-polarized light of an incident light.

Abstract: The disclosure relates to a lighting unit includes a light source and an optical filter. The light source emits a first light beam with a continuous wavelength ranged from about 600 nanometers to about 1500 nanometers. The optical filter is located in the propagation path of the first light beam and allowing the first light with a certain wavelength to pass through. The disclosure also relates to an optical coherence tomography system using the same.

Abstract: This disclosure relates to a pulse oximeter. The pulse oximeter includes a light source; a light acquirer spaced apart from the light source; a processor connected to the light acquirer; a filter in the light path from the light source to the light acquirer; and a first mechanical device. The filter includes a first single band filter having center wavelength of 660 nm and a second single band filter having center wavelength of 940 nm. The first mechanical device moves the filter so that the first single band filter and the second single band filter are alternately in the light path from the light source to the light acquirer. The double band filter can filter the unnecessary light and improve the accuracy of the pulse oximeter.

Abstract: This disclosure relates to a pulse oximeter. The pulse oximeter includes a light source emitting detecting light; a light acquirer spaced apart from the light source and so that the detecting light can get the light acquirer after passing through the object; a processor connected to the light acquirer; and a filter on the light path from the light source to the light acquirer. The filter includes a double band filter having center wavelengths of 660 nm and 940 nm. The double band filter can filter the unnecessary light and improve the accuracy of the pulse oximeter.

Abstract: An exemplary video wall includes two display panels and a polygonal mullion elimination lens. Each of the display panels includes a main body and a bezel surrounding the main body. The polygonal mullion elimination lens includes a central first concave surface configured to reflect internal light incident thereon, two flat surfaces respectively attached to the main bodies of the display panels, a central second concave surface opposite to the first concave surface, and two lateral surfaces each connecting between a corresponding one of the flat surfaces and the second concave surface. Portions of light emitted by the main bodies of the display panels can enter the mullion elimination lens via the flat surfaces.

Abstract: An exemplary video wall includes two display panels and a polygonal mullion elimination lens. Each of the display panels includes a main body and a bezel surrounding the main body. The polygonal mullion elimination lens includes a central first concave surface configured to reflect internal light incident thereon, two flat surfaces respectively attached to the main bodies of the display panels, a central second concave surface opposite to the first concave surface, and two lateral surfaces each connecting between a corresponding one of the flat surfaces and the second concave surface. Portions of light emitted by the main bodies of the display panels can enter the mullion elimination lens via the flat surfaces.

Abstract: A touch panel input stylus comprises a casing, a lens, a shading member, and a light emitting element. The lens, the shading member, and the light emitting element are received in the casing. The shading member defines a stepped through aperture. The stepped through aperture includes a light through hole and a receiving hole having a greater diameter than the light through hole. A longitudinal positioning structure is provided in the receiving hole. The light emitting element is received and fixed in the receiving hole firmly by the longitudinal positioning structure. The longitudinal positioning structure is deformable. The light emitted from the light emitting element passes through the light through hole and then travels through the lens.

Abstract: A lens system, in order from the object, includes positive first lens, negative second lens, positive third lens, positive fourth lens, and an aperture stop positioned between the third and fourth lens. The second lens includes a first optical portion, a first support portion surrounding the first optical portion with a first surface and second surface. The third lens includes a second optical portion and a second support portion surrounding the second optical portion with a third surface and fourth surface. The fourth lens includes a light stop surface facing the object side of the lens system. The lens system satisfies the formulas: d23<1.1×d34, where the d23 is a distance along the optical axis of the lens system from the second surface to the third surface, and the d34 is a distance along the optical axis from the fourth surface to the light stop surface.

Abstract: A light concentration device includes a light concentration plate. The light concentration plate has a first surface and a second surface facing away from the first surface. The light concentration plate defines a number of through holes running through the first surface and the second surface. The light concentration plate has a number of inner surfaces in the respective through holes. Each of the through holes tapers from the second surface to the first surface. The inner surfaces and at least one of the first and second surfaces are reflective surfaces.

Abstract: A touch panel input stylus comprises a casing, a lens, a shading member, and a light emitting element. The lens, the shading member, and the light emitting element are received in the casing. The shading member defines a stepped through aperture. The stepped through aperture includes a light through hole and a receiving hole having a greater diameter than the light through hole. A longitudinal positioning structure is provided in the receiving hole. The light emitting element is received and fixed in the receiving hole firmly by the longitudinal positioning structure. The longitudinal positioning structure is deformable. The light emitted from the light emitting element passes through the light through hole and then travels through the lens.

Abstract: A light pen with an open end includes a light emitting diode and a light shielding element. The light-emitting diode is fixed in the light pen, and includes a light guide body facing the open end. The light shielding element is made of opaque material and disposed between the open end and the light-emitting diode. The light shielding element defines a through hole configured for allowing light at a half-intensity angle of the light-emitting diode to pass therethrough.

Abstract: A lens system, in order from the object, includes positive first lens, negative second lens, positive third lens, positive fourth lens, and an aperture stop positioned between the third and fourth lens. The second lens includes a first optical portion, a first support portion surrounding the first optical portion with a first surface and second surface. The third lens includes a second optical portion and a second support portion surrounding the second optical portion with a third surface and fourth surface. The fourth lens includes a light stop surface facing the object side of the lens system. The lens system satisfies the formulas: d23<1.1×d34, where the d23 is a distance along the optical axis of the lens system from the second surface to the third surface, and the d34 is a distance along the optical axis from the fourth surface to the light stop surface.

Abstract: An exemplary camera module for mounting to a base and capturing an image of a top surface of the base is provided. The camera module includes a reflective mirror having a curved reflective surface, a lens, and an image sensor in optical alignment with the lens. The curved reflective surface is configured for reflecting light from the top surface of the base to the lens.

Abstract: A backlight module is provided, comprising a light emitting diode (LED), a light guide plate and a fluorescence material. The fluorescence material is disposed in a transmission path of a first light or within the light guide plate. Then the fluorescence material is excited by the first light to generate one or more second lights. The first light and the second light are mixed or the second lights with different wavelengths are mixed to form a white light to generate a plane light source with a desired color temperature.