Abstract: An illumination system including at least one first light source, a prism and a light uniforming device is provided. The first light source is capable of providing a first beam. The prism is disposed on a transmission path of the first beam, and has four first facets. Two of the first facets are opposite to each other, and the other two first facets are opposite to each other. The first beam passes through one of the first facets and is totally internally reflected by another first facet opposite to the one of the first facets. The light uniforming device is disposed on the transmission path of the first beam from the another first facet. The cost of the illumination system is lower, and the illumination system has high flexibility of the light source design and can provide illumination with high brightness.

Abstract: An optical lens module including a foundation, at least one actuator, a lens base, an optical lens, at least one shaft, and at least one rocker arm is provided. The actuator is disposed in an accommodation space, defined inside the foundation, and fixed on the foundation. The lens base is disposed in the accommodation space and beside the actuator. The optical lens is disposed on the lens base. The shaft has a first end and a second end opposite to the first end. The first end is solidly connected to the lens base. The second end is connected to the foundation. The rocker arm has a third end and a fourth end opposite to the third end. The third end is solidly connected to a portion of the shaft between the first end and the second end. The fourth end is connected to the actuator.

Abstract: An illumination system having a light source, an integration rod and a color wheel is provided. The light source is suitable for providing a light beam. The light integration rod and the color wheel are disposed in the transmission path of the light beam. The color wheel is disposed between the light source and the light integration rod. The light integration rod has a light input end adjacent to the color wheel and a light output end opposite the light input end. The light integration rod has two indentations at the light input end to form an airflow channel. The noise caused by the rotating color wheel is reduced through the airflow channel.

Abstract: An optical lens module including a foundation, at least one actuator, a lens base, an optical lens, at least one shaft, and at least one rocker arm is provided. The actuator is disposed in an accommodation space, defined inside the foundation, and fixed on the foundation. The lens base is disposed in the accommodation space and beside the actuator. The optical lens is disposed on the lens base. The shaft has a first end and a second end opposite to the first end. The first end is solidly connected to the lens base. The second end is connected to the foundation. The rocker arm has a third end and a fourth end opposite to the third end. The third end is solidly connected to a portion of the shaft between the first end and the second end. The fourth end is connected to the actuator.

Abstract: A laser module including at least one light-emitting unit, a filter and a poled nonlinear optical crystal is provided. The light-emitting unit provides an incoherent beam. The filter is disposed on the transmission path of the incoherent beam and reflects at least a part of the incoherent beam. The poled nonlinear optical crystal is disposed on the transmission path of the incoherent beam, and has a plurality of poled portions. The poled portions have a plurality of first poled portions and a plurality of second poled portions which are alternately disposed. The incoherent beam passes through at least a part of the first poled portions and a part of the second poled portions. At least parts of the poled portions have different average widths from each other in the direction parallel to the chief ray of the incoherent beam.

Abstract: An optical module including a first integration rod, a polarization beam splitting unit, a first reflector, a first quarter-wave plate, and a light source is provided. The first integration rod has a first end and a second end opposite to each other. The polarization beam splitting unit is disposed at a side of the first end. The polarization beam splitting unit reflects a beam with a first polarization direction and allows a beam with a second polarization direction to pass through. The first reflector is disposed at a side of the second end. The first quarter-wave plate is disposed between the polarization beam splitting unit and the first reflector. The light source provides a light beam to the polarization beam splitting unit. The light beam includes a first polarization beam with the first polarization direction. The polarization beam splitting unit reflects the first polarization beam to the first integration rod.

Abstract: An illumination system including a coherent light source, a light integrator and a first actuator is provided. The coherent light source is capable of providing an illumination beam. The light integrator is disposed on a transmission path of the illumination beam, and the first actuator is connected to the light integrator. The light integrator has a light entering end and a light exit end opposite to the light entering end, and the light entering end faces the coherent light source. The first actuator is capable of driving the light integrator to move and/or rotate, so as to change a position at the light entering end entered by the illumination beam.

Abstract: A zoom lens including a first lens group with a negative refractive power and a second lens group with a positive refractive power is provided. The first lens group includes a first lens, a second lens, and a third lens arranged from an object side to an image side in sequence. The refractive powers of the first, second, and third lenses are negative, negative, and positive sequentially. The second lens group includes a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged from the object side to the image side in sequence. The refractive powers of the fourth, fifth, sixth, and seventh lenses are positive, positive, negative, and positive sequentially. The first lens group and the second lens group are capable of moving between the object side and the image side.

Abstract: A fixed-focus lens including a first lens group, a second lens group and a third lens group which are arranged in sequence from an object side to an image side is provided. The first lens group has a negative refractive power and includes a first lens and a second lens arranged in sequence from the object side to the image side, and both having negative refractive powers. The first lens is an aspheric lens. The second lens group has a positive refractive power and includes a lens with positive refractive power. The third lens group has a positive refractive power and includes at least one first cemented lens. The fixed-focus lens satisfies 1.2<|fG1/f|<4.2 and 2.8<|fL2/f|<8.6, where f, fG1 and fL2 are effective focal lengths of the fixed-focus lens, the first lens group and the second lens respectively.

Abstract: An image shifting module for shifting imaging positions of sub-images projected on a screen in each frame, and an optical projection device using the same are provided. The image shifting module includes a first vibration mechanism and a second vibration mechanism. The first vibration mechanism is disposed on the transmission path of the sub-images and shifts the sub-images projected on the screen by a first distance along a horizontal direction in each frame time. Moreover, the second vibration mechanism is disposed on the transmission path of the sub-images and shifts the sub-images projected on the screen by a second distance along a vertical direction in each frame time. Through this image shifting module, the image resolution can be increased.

Abstract: An optical engine including a beam splitting and combining system, which includes a first polarizing beam splitting (PBS) unit, a dichroic unit and a second PBS unit, is provided. A first color beam is reflected by the first PBS unit, is reflected by a first light valve, and passes through the first PBS unit sequentially. A second color beam passes through the first PBS unit, is reflected by a second light valve, and is reflected by the first PBS unit sequentially. The dichroic unit is disposed on an optical path of the first and second color beams. The second PBS unit is capable of allowing a third color beam to travel to a third light valve and allowing the third color beam reflected from the third light valve to travel to the dichroic unit. The dichroic unit is capable of combining the first, second and third color beams.

Abstract: A position adjusting device includes a base unit with spaced-apart first and second lateral plates. A bracket is elongated and interposed between the first and second lateral plates for mounting an integration rod, and includes opposite first and second open ends. A connecting mechanism includes two resilient pins connected respectively between the bracket and the first lateral plate and between the bracket and the second lateral plate. The resilient pins are proximate to the first open end of the bracket. An adjusting member extends through the first lateral plate, and abuts against one side of the bracket proximate to the second open end. The adjusting member drives the bracket to move along a first axis and a second axis perpendicular to the first axis. The first and second axes are perpendicular to an extension direction of the bracket.

Abstract: An illumination system for providing an illumination beam to a light valve is provided. The illumination system includes a light source, a light integration rod, a color wheel, a first focusing unit and a second focusing unit. The light source is capable of generating the illumination beam, and the light integration rod is disposed on the transmission path of the illumination beam. The first focusing unit is disposed between the integration rod and the color wheel and is capable of focusing the illumination beam onto the color wheel. The second focusing unit is disposed between the color wheel and the light valve and is capable of focusing the illumination beam onto the light valve.

Abstract: A projection apparatus including an illumination system, a reflective light valve and an imaging system is provided. The illumination system emits an illumination beam. The reflective light valve is disposed on a transmission path of the illumination beam. The imaging system includes a first lens group, a polarization beam splitter and a second lens group. The first lens group is disposed on the transmission path of the illumination beam between the illumination system and the reflective light valve. The polarization beam splitter is disposed on the transmission path of the illumination beam between the illumination system and the first lens group. The polarization beam splitter permits the illumination beam to pass through and travel to the reflective light valve. The reflective light valve modulates the illumination beam to an image beam traveling to the polarization beam splitter. The polarization beam splitter reflects the image beam to the second lens group.

Abstract: A zoom lens suitable for imaging an object on a photosensitive element is provided. The zoom lens includes a first lens group, a second lens group disposed between the first lens group and the photosensitive element, a third lens group disposed between the second lens group and the photosensitive element, and a fourth lens group. The second lens group is suitable for moving between the first lens group and the third lens group. The third lens group includes two lenses having positive refractive power. The fourth lens group is disposed and suitable for moving between the third lens group and the photosensitive element. The refractive powers of the first lens group, the second lens group, the third lens group, and the fourth lens group are a positive value, a negative value, a positive value, and a positive value respectively.

Abstract: A light integration rod having a light input end and a light output end opposite to each other is provided. The light integration rod includes a first reflective plate, a second reflective plate, a third reflective plate and a fourth reflective plate. The second reflective plate is opposite to the first reflective plate. The third reflective plate and the fourth reflective plate connect the first reflective plate and the second reflective plate, and are disposed opposite to each other. A long side of the first reflective plate is not equal to a long side of the second reflective plate. A short side at the light output end of at least one of the first reflective plate and the second reflective plate is separate from a short side of the third reflective plate and a short side of the fourth reflective plate at the light output end.

Abstract: A fixed-focus lens including a first lens group, a second lens group, and a third lens group arranged from an object side to an image side in sequence is provided. The first lens group has a negative refractive power, and includes at least one aspheric lens. The second lens group has a positive refractive power, and includes a lens. The third lens group has a positive refractive power, and includes a triple cemented lens. An effective focal length (EFL) of the fixed-focus lens is f. An EFL of the first lens group is f1. An EFL of the second lens group is f2. An EFL of the third lens group is f3. An axial distance between the first lens group and the second lens group is d. The fixed-focus lens satisfies: 2.5<|f1/f|<4.5, 7.5<f2/f<10, 4.5<f3/f<8.5, and 13<d/f<14.

Abstract: A fixed-focus lens including a first lens group, a second lens group and a third lens group, which are arranged in sequence from an object side to an image side, is provided. The first lens group has a negative refractive power and includes three lenses arranged from the object side to the image side. The lens, closest to the object side, of the first lens group is an aspheric lens. The second lens group has a positive refractive power and includes two lens arranged from the object side to the image side. The third lens group has a positive refractive power and includes six lenses arranged from the object side to the image side. Refractive powers of the lenses of the third lens group in sequence from the object side to the image side are negative, positive, negative, positive, positive and positive.

Abstract: An imaging displacement module including a frame, an optical element, a carrier, a connecting portion and at least a first actuator is provided. The frame has a first opening, and the optical element, the carrier, the connecting portion and the first actuator are all disposed in the first opening. The carrier is capable of carrying the optical element, and the connecting portion connects between the frame and the carrier and capable of generating an elastic torsion around an axis. The first actuator is disposed at a side of the carrier and capable of driving the carrier to vibrate periodically.

Abstract: An optical engine for a projection display device includes a housing, a light source module, an imaging unit, and a projecting mechanism. The housing includes a base wall and a surrounding wall cooperating with the base wall for defining a receiving space with an opening. The light source module is disposed at a side of the housing for providing an illuminating light beam into the receiving space. The imaging unit is disposed in the receiving space, and includes a display element and an optical lens set. The projecting mechanism includes a lens barrel having first and second barrel ends, a projecting lens disposed at the second barrel end, and a coupling element formed on an outer surface of the lens barrel adjacent to the first barrel end. The coupling element is configured to have a size and shape corresponding to those of the opening, and is disposed to cover the opening and to seal the receiving space.