Abstract: A light source device includes a first light source, a second light source, a reflective assembly, and a condensing lens defining an optical axis. The first light source includes a first lamp and a first reflector reflecting light beams generated by the first lamp as first parallel light beams. The second light source includes a second lamp and a second reflector reflecting light beams generated by the second lamp. The first light source, the reflective assembly and the condensing lens are arranged in order along the optical axis. The second light source corresponds to the reflective assembly deviated from the optical axis. The reflective assembly reflects light beams reflected by the first reflector back to the first reflector, and reflects light beams from the second reflector to the condensing lens. The condensing lens condenses the first parallel light beams and the light beams reflected by the reflective assembly.

Abstract: A light guide is a quarter of cylinder in shape and includes a cylindrical emitting surface, an incident surface adjacent to and facing away from the cylindrical emitting surface, and a connecting surface connecting the cylindrical emitting surface and incident surface. The light guide defines five a number of grooves in the incident surface. Each groove is bounded by two surfaces. The inclined angle of the two surface is designed to satisfy a set of conditions to improve light uniformity of the cylindrical emitting surface.

Abstract: An antireflection film includes a first layer, a second layer, a third layer, a fourth layer, a fifth layer, a sixth layer, and a seventh layer. Each of the first, third, fifth, and seventh layer is formed using a low refractive index material. Each of the second, fourth, and sixth layer is formed using a high refractive index material. The thicknesses of the first, second, third, fourth, fifth, sixth, and seventh layers are in ranges of 0.122d1 to 3.052d1, 0.267d2 to 0.370d2, 0.427d3 to 0.610d3, 0.760d4 to 0.924d4, 0.305d5 to 0.378d5, 0.575d6 to 0.718d6, and 1.160d7 to 1.342d7, correspondingly, wherein di=?/(4×ni), (i=1, 2, . . . 7), ni is a refractive index of the i-th layer, and ? is a reference wavelength of incident light entered into the antireflection film.

Abstract: A panoramic imaging system includes a panoramic imaging lens, a relay lens, an imaging device, and a display device. The panoramic imaging lens includes an annular incident surface and a bottom surface adjacent to the annular incident surface. The bottom surface includes an annular reflective portion substantially opposite to the annular incident surface. An image light incident through the annular incident surface can be total reflected by the annular reflective portion.

Abstract: A stereo projection optical system includes a polarizing beam splitter, a 2-way wheel, a digital micro-mirror device, and a total internal reflection prism. The polarizing beam splitter is configured for emitting two light outputs. The 2-way wheel includes a reflective region and a transmissive region. The reflective region is configured for reflecting the light outputs and the transmissive region is configured for transmitting the light outputs. The digital micro-mirror device is configured for superimposing spatial information on the light outputs. The total internal reflection prism configured for coupling the light outputs of the 2-way wheel into the digital micro-mirror device and transmitting a light output of the digital micro-mirror device. The stereo projection optical systems provide viewers three-dimensional images formed by two alternative polarized light beams whose polarizations are perpendicular to each other utilizing the 2-way wheel.

Abstract: A testing method is configured for testing parameters of a color wheel. The color wheel includes a color filter, which includes three sector-shaped filter segments and a motor for driving the filter segments of the color filter to rotate. The color filter is driven to rotate. Light is emitted toward the color filter of the color wheel, and reflected back by the color filter. Boundary impulses are generated according to changes in intensity of the light reflected back by the color filter. Based on relationships between the boundary impulses, central angles of the filter segments of the color wheel are calculated.

Abstract: A lens system includes a first lens and a second lens in order from the object side thereof. The first lens includes a first optical portion and a first mounting portion surrounding the first optical portion. The second lens includes a second optical portion with a convex object side surface, and a second mounting portion surrounding the second optical portion. The convex object side surface includes an optical surface at the center thereof and a first connecting surface surrounding the optical surface. The second mounting portion includes a second connecting surface surrounding the first connecting surface. Wherein the angle measured anti-clockwise from the first connecting surface to the axis of the lens system satisfies a certain condition.

Abstract: A lens module includes a lens barrel and a lens and an opaque adhesive layer. The lens includes a central imaging portion and a peripheral non-imaging portion. The lens is received in the lens barrel with the peripheral non-imaging portion contacting the lens barrel. The opaque adhesive layer is applied to a contact portion between the lens barrel and the lens to fixedly secure the lens to the lens barrel and configured for blocking light from entering through the peripheral non-imaging portion.

Abstract: A testing system measures central angles of filter segments of a color wheel. The color wheel includes a color filter, which includes three sector-shaped filter segments and a motor for driving the filter segments to rotate. The testing system includes a sensor and a processor. The sensor emits light toward the color filter and receives light reflected back by the color filter, and generates an impulse signal according to intensity changes of the light reflected back by the color filter. The impulse signal includes a plurality of boundary impulses corresponding to boundaries formed between adjacent filter segments. The processor calculates central angles of the filter segments according to relationships between the boundary impulses.

Abstract: An antireflection film includes a first layer, a second layer, a third layer, a fourth layer, a fifth layer, a sixth layer, and a seventh layer. Each of the first, third, fifth, and seventh layer is formed using a low refractive index material. Each of the second, fourth, and sixth layer is formed using a high refractive index material. The thicknesses of the first, second, third, fourth, fifth, sixth, and seventh layers are in ranges of 0.122d1 to 3.052d1, 0.267d2 to 0.370d2, 0.427d3 to 0.610d3, 0.760d4 to 0.924d4, 0.305d5 to 0.378d5, 0.575d6 to 0.718d6, and 1.160d7 to 1.342d7, correspondingly, wherein di=?/(4×ni), (i=1, 2, . . . 7), ni is a refractive index of the i-th layer, and ? is a reference wavelength of incident light entered into the antireflection film.

Abstract: A lens system includes a first lens and a second lens in order from the object side thereof. The first lens includes a first optical portion and a first mounting portion surrounding the first optical portion. The second lens includes a second optical portion with a convex object side surface, and a second mounting portion surrounding the second optical portion. The convex object side surface includes an optical surface at the center thereof and a first connecting surface surrounding the optical surface. The second mounting portion includes a second connecting surface surrounding the first connecting surface. Wherein the angle measured anti-clockwise from the first connecting surface to the axis of the lens system satisfies a certain condition.

Abstract: A light guide is a quarter of cylinder in shape and includes a cylindrical emitting surface, an incident surface adjacent to and facing away from the cylindrical emitting surface, and a connecting surface connecting the cylindrical emitting surface and incident surface. The light guide defines five a number of grooves in the incident surface. Each groove is bounded by two surfaces. The inclined angle of the two surface is designed to satisfy a set of conditions to improve light uniformity of the cylindrical emitting surface.

Abstract: A lens includes an incidence surface and an emission surface. The emission surface includes an effective area and a non-effective area around the effective area. The non-effective area includes a first effective area located at the center of the effective area and a second effective area around the first effective area. The first effective area is three fifths of the effective area. A number of recesses formed on the surface of the first effective area and substantially over the entire first effective area.

Abstract: A light source device includes a first light source, a second light source, a reflective assembly, and a condensing lens defining an optical axis. The first light source includes a first lamp and a first reflector reflecting light beams generated by the first lamp as first parallel light beams. The second light source includes a second lamp and a second reflector reflecting light beams generated by the second lamp. The first light source, the reflective assembly and the condensing lens are arranged in order along the optical axis. The second light source corresponds to the reflective assembly deviated from the optical axis. The reflective assembly reflects light beams reflected by the first reflector back to the first reflector, and reflects light beams from the second reflector to the condensing lens. The condensing lens condenses the first parallel light beams and the light beams reflected by the reflective assembly.

Abstract: A lens includes an optical portion and a mounting portion. The optical portion refracts a first portion of light from an object incident on the optical portion to form an image of the object. The mounting portion surrounds the optical portion. The mounting portion includes at least one light dispersing surface dispersing a second portion of light from the object light incident thereon. A lens module and camera module utilizing the lens are further disclosed.

Abstract: A lens system includes a first lens and a second lens in order from the object side thereof. The first lens includes a first optical portion and a first mounting portion surrounding the first optical portion. The second lens includes a second optical portion with a concave object side surface, and a second mounting portion surrounding the second optical portion. The second mounting portion includes a connecting surface surrounding an object side surface of the second optical portion. Wherein the angle formed between the connecting surface and the axis of the lens system satisfies a certain condition.

Abstract: A stereo projection optical system includes a polarizing beam splitter, a 2-way wheel, a digital micro-mirror device, and a total internal reflection prism. The polarizing beam splitter is configured for emitting two light outputs. The 2-way wheel includes a reflective region and a transmissive region. The reflective region is configured for reflecting the light outputs and the transmissive region is configured for transmitting the light outputs. The digital micro-mirror device is configured for superimposing spatial information on the light outputs. The total internal reflection prism configured for coupling the light outputs of the 2-way wheel into the digital micro-mirror device and transmitting a light output of the digital micro-mirror device. The stereo projection optical systems provide viewers three-dimensional images formed by two alternative polarized light beams whose polarizations are perpendicular to each other utilizing the 2-way wheel.

Abstract: A stereo projection optical system includes a polarizing beam splitter configured for splitting a light input into first, second polarized light components, first, second digital micro-mirror device respectively positioned to receive the first, second polarized light component and configured for superimposing spatial information on the first, second polarized light component, first, second total internal reflection prism configured for coupling the first, second polarized light component into the first, second digital micro-mirror device and a light combiner. The projecting lens projects two images formed by the first polarized light component and the second polarized light component with spatial information in the stereo projection optical systems. When a viewer wear glasses that have two polarizing lenses whose polarization direction is perpendicular to each other, the viewer can perceive projected images as being “3-D”.

Abstract: A prism monomer for use in a digital light processing projection device includes a plastic triangular prism having a hypotenuse surface and a glass sheet. The glass sheet has two opposite surfaces. One surface of the glass sheet is attached to the hypotenuse surface of the plastic triangular prism and the other surface of the glass sheet is formed with an anti-reflective coating.

Abstract: A system for detecting blemishes on a surface of an object includes at least an image capturing apparatus, at least a light source assembly, and a data processing device. The image capturing apparatus is configured for an image of a surface of an object and acquiring a brightness value of each of pixels of the image. The light source assembly is configured for light the surface. The data processing device is electrically connected to the image capturing apparatus and configured for calculating sum of all of the brightness value to obtain a mean value of the brightness values, comparing the brightness value of each pixel with the mean value and marking the pixels as a blemish whose brightness value is greater than the mean value. The system and method avoid errors that may otherwise occur due to the interference of noise, and avoid the subjective factors of viewers.