Abstract: An optical assembly and projection device using the same. The optical assembly configured for converting light defined by a light path. A color wheel includes at least two color circles, the at least two color circles are arranged concentrically and each includes a plurality of color zones. A first drive assembly connect to the color wheel, the first drive assembly is configured for driving the color wheel to rotate, and the plurality of color zones of each of the at least two color circles are illuminated by the light in the light path. A second drive assembly connect to the first drive assembly, the second drive assembly is configured for driving the color wheel in a first direction, and each of the at least two color circles is illuminated a light beam defined by the light path, the first direction intersects with a directional extension of the light path.

Abstract: A projection light source system includes a laser light source, a fluorescence wheel, a color wheel, and a light guide assembly. The fluorescence wheel includes a yellow fluorescence area, a green fluorescence area, and a blue fluorescence area. The yellow fluorescence area, the green fluorescence area, and the blue fluorescence area are configured to receive excitation light in time sharing, and generate fluorescence of different colors according to the excitation light. The yellow fluorescence area is configured to generate yellow fluorescence, the green fluorescence area is configured to generate green fluorescence, and the blue fluorescence area is configured to generate blue fluorescence. The color wheel is configured to receive the fluorescence and output red light, green light, and blue light in sequence to form light in three basic colors. The light guide assembly is located on a light path of the excitation light and the fluorescence.

Abstract: A lighting system and a projection device with enhanced functionality includes a light source in the lighting system for emitting first light, a first wavelength selection structure, and a second wavelength selection structure. The first wavelength selection structure includes a wavelength selection portion for transmitting the first light in a first target wavelength and a first light-transmitting portion for transmitting the first light. The light emitted then from the first wavelength selection structure is defined as second light. The second wavelength selection structure receives the second light and applies a supplementary portion for transmitting the second light in a second target wavelength and a second light-transmitting portion for transmitting the light. The light emitted from the second wavelength selection structure is adjustable as to colors, as to low or high color saturation, and as to low or high brightness of the projection image.

Abstract: A device as a light-emitting for a projector. The projector includes a light-emitting module and a first lens array positioned at one side. The first lens array includes a number of first lenses arranged in parallel along a first direction. The first lens array is configured to receive source light. A second lens array is positioned at a side of the first lens array. The second lens array includes a number of second lenses arranged in parallel along a second direction. The second lens array receives first collimated light from the first lenses and emits second collimated light which is of even light-spot density and uniform brightness.

Abstract: A lighting system and a projection device with enhanced functionality includes a light source in the lighting system for emitting first light, a first wavelength selection structure, and a second wavelength selection structure. The first wavelength selection structure includes a wavelength selection portion for transmitting the first light in a first target wavelength and a first light-transmitting portion for transmitting the first light. The light emitted then from the first wavelength selection structure is defined as second light. The second wavelength selection structure receives the second light and applies a supplementary portion for transmitting the second light in a second target wavelength and a second light-transmitting portion for transmitting the light. The light emitted from the second wavelength selection structure is adjustable as to colors, as to low or high color saturation, and as to low or high brightness of the projection image.

Abstract: A device as a light-emitting for a projector. The projector includes a light-emitting module and a first lens array positioned at one side. The first lens array includes a number of first lenses arranged in parallel along a first direction. The first lens array is configured to receive source light. A second lens array is positioned at a side of the first lens array. The second lens array includes a number of second lenses arranged in parallel along a second direction. The second lens array receives first collimated light from the first lenses and emits second collimated light which is of even light-spot density and uniform brightness.

Abstract: A stationary light source includes a light source group, a light guide assembly, and a light combining device. The light source group includes a laser source, a scattering mirror, and a fluorescent scattering mirror. A laser beam generated by the laser source includes two beams, a first beam shining onto the scattering mirror generating a first colored light, and a second beam shining onto the fluorescent scattering mirror generating a second colored light. The scattering mirror and the fluorescent scattering mirror are located within the light combining device. The light combining device is configured to combine and concentrate the first colored light and the second colored light and emit the combined and concentrated light onto the light guide assembly. The light combining device is a semielliptical hollow reflecting mirror.

Abstract: A reduced-size, high-efficiency projector includes a light source, a dichroic mirror, a quarter-wave sheet, a quarter-wave sheet, and a color wheel. The light source emits a first light ray of a first color which strikes the tilted dichroic mirror. The dichroic mirror reflects the first light ray to generate a second light ray on a second light path. The quarter-wave sheet is arranged on the second light path, and changes a polarization state by about 45 degrees. The color wheel is arranged in front of the quarter-wave sheet and able to generate a third light ray of a second color when irradiated by the first light ray of the first color.

Abstract: A lens module for autofocus of a camera in passive mode includes a lens barrel containing a first lens, a second lens, a pressure sensor, an image sensor, and a processor. In the passive autofocus mode, the first lens is located at a first end of the lens barrel and moves within the lens barrel when a distance to a target object changes. The pressure sensor between the first and the second lenses senses both pulling and pushing pressures which the first lens applies. The image sensor is adjacent to an end of the lens barrel and is behind the first and second lenses. The processor can apply formulas to calculate a distance between the target object and the lens module.

Abstract: A lens module for autofocus of a camera in passive mode includes a lens barrel containing a first lens, a second lens, a pressure sensor, an image sensor, and a processor. In the passive autofocus mode, the first lens is located at a first end of the lens barrel and moves within the lens barrel when a distance to a target object changes. The pressure sensor between the first and the second lenses senses both pulling and pushing pressures which the first lens applies. The image sensor is adjacent to an end of the lens barrel and is behind the first and second lenses. The processor can apply formulas to calculate a distance between the target object and the lens module.

Abstract: A projector includes a light source device, an optical mixing device, a light guide device, a prism group, a digital display, and projection lenses. The light guide device includes a hollow body; the body includes an inner surface and an exterior surface corresponding to the inner surface. The inner surface is coated with a first film, the exterior surface is coated with a second film, the first film is configured to partially reflect light rays, the second film is configured to totally reflect the light rays.