Abstract: A Fresnel light emitting diode (LED) Lens and a LED Assembly thereof are provided. The Fresnel LED Lens is a lens disposed with a plurality of Fresnel optical surfaces. Each Fresnel optical surface includes a zone area having a plurality of drafts with vertical shape. Each Fresnel optical surface is arranged linearly along a center of a corresponding LED, and each Fresnel optical surface can used to focus light emitted from a LED chip so as to generate a quasi-circle distribution pattern of light with uniform light intensity and satisfy special optical requirements. A LED assembled formed by the Fresnel LED lens and a corresponding LED is used as a light source applied to illumination, mobile phone flashlights or camera flashlights.

Abstract: A three-piece optical pickup lens includes, sequentially from an object side to an image side of the three-piece optical pickup lens along an optical axis thereof, an aperture stop, a first lens, a second lens, and a third lens. The first lens is a meniscus lens of positive refractive power. The second lens has an object side and an image side, on each of which at least one inflection point is formed at a position located between a center and a periphery of the second lens. The third lens has an object side and an image side, on each of which at least one inflection point is formed at a position located between a center and a periphery of the third lens, and has positive refractive power at paraxial region of optical axis.

Abstract: An imaging lens system with two lenses is provided. The imaging lens system with two lenses, along an optical axis from an object side to an image side, comprises an aperture stop; a first lens having positive refractive power and being a biconvex lens; and a second lens having negative refractive power and being a meniscus lens with a concave surface on the object side and a convex surface on the image side.

Abstract: A reading optical lens module, along an optical axis, comprising: two lens elements of meniscus shape, an aperture stop and an image sensor, wherein the first lens element with its convex surface on the object side having bi-aspherical surfaces and the second lens element with its convex surface on the image side having bi-aspherical surfaces, the aperture stop aligning between the first element and the second lens element and the image sensor disposing on the image plane for converting the objective image to electrical signal. Additionally, the reading optical lens module satisfies conditions related to reduction of total length, expansion of field of view angle and increase of resolution for use in the compact bar-code reader machine.

Abstract: The present invention discloses a linear light source having light guide with tapered saw tooth structures for Charge Coupling Device Module (CCDM). The linear light source comprises a light guide and at least two Light Emitting Diodes (LED's). The light guide includes two incident surfaces, a reflective surface, two refractive surfaces and an ejective surface. The reflective surface has a tapered saw tooth structure; the LEDs are disposed at two ends of the light guide. Upon emission of light from the LEDs, light enters into the light guide, reflected by the tapered saw tooth structures, and then ejected from the ejective surface. It is possible to form a U-shaped lambert distribution in the sub scanning direction, thereby generating the complementary effect for the pickup lens and the CCD image sensor of CCDM, as well as to create a linearly converged lambert distribution in the main scanning direction.

Abstract: An imaging lens system with two lenses is provided. The imaging lens system with two lenses, along an optical axis from an object side to an image side, comprises an aperture stop; a first lens having positive refractive power and being a biconvex lens; and a second lens having negative refractive power and being a meniscus lens with a concave surface on the object side and a convex surface on the image side.

Abstract: A stacked disk-shaped optical lens array, a stacked disk-shaped lens module array and a method of manufacturing the same are revealed. The stacked disk-shaped optical lens array is produced by stacked disk-shaped optical lens modules whose optical axis is aligned. The stacked disk-shaped lens module array is produced by a stacked disk-shaped optical lens array whose optical axis is aligned by an alignment fixture, stacked and assembled with required optical element arrays. In the stacked disk-shaped lens module array produced by this method, the lens optical axis is aligned precisely. Moreover, the manufacturing process is simplified and the cost is reduced.

Abstract: A three-piece optical pickup lens includes, sequentially from an object side to an image side of the three-piece optical pickup lens along an optical axis thereof, an aperture stop, a first lens, a second lens, and a third lens. The first lens is a meniscus lens of positive refractive power. The second lens has an object side and an image side, on each of which at least one inflection point is formed at a position located between a center and a periphery of the second lens. The third lens has an object side and an image side, on each of which at least one inflection point is formed at a position located between a center and a periphery of the third lens, and has positive refractive power at paraxial region of optical axis.

Abstract: A lens displacement mechanism using shaped memory alloy (SMA) applied to an auto-focusing lens module is disclosed. The lens displacement mechanism comprising at least one SMA wire. Two opposite ends of the SMA wire are fixed and a longitudinal mid-point of an intermediate movable portion between the two opposite ends is tightened and is fixed on a corresponding hook disposed on an outer edge of the lens so that the intermediate movable portion is tightened between the two opposite ends. When the SMA wire is heated, the intermediate movable portion contracts to pull the hook of the lens for driving the lens to move and slide along with an optical axis so as to achieve auto-focus control. The present lens displacement mechanism is simple in structure and reflow process. Therefore, the present displacement mechanism is suitable to be used in portable camera or mobile phone or PDA, which needs to be small and have easily mass production by SMT.

Abstract: A glass lens array module with alignment fixture and a manufacturing method thereof are revealed. A glass lens array is produced by multi-cavity glass molding and alignment members are arranged on a peripheral of non-optical area of the glass lens array. Optical axis of each of two adjacent glass lens arrays is aligned by corresponding alignment members and the glass lens arrays are assembled by glue. A spacer is disposed between the two adjacent glass lens arrays to form a preset interval if needed. Thus a glass lens array module is formed after curing of the glue. Thereby the alignment of the optical axis of the glass lens is achieved easily and optical precision is also attained. Moreover, the manufacturing processes are simplified and the cost is reduced.

Abstract: An imaging lens system with two lenses is provided. The imaging lens system with two lenses, along an optical axis from an object side to an image side, includes an aperture stop; a first lens having positive refractive power and being a plano-convex lens with a convex surface on the image side; and a second lens having negative refractive power and being a meniscus lens with a concave surface on the object side and a convex surface on the image side.

Abstract: A projection apparatus includes a light source emitting an illuminating beam, a light valve receiving the illuminating beam to create an image beam, and a projection lens system arranged on a path of the image beam for receiving and projecting the image beam onto a screen. The projection lens system includes four lens elements arranged along the optical axis in order from the screen toward the light valve, namely, first, second, third and fourth lens elements respectively having positive, negative, positive and positive refractive power. The four-piece projection lens system satisfies the condition of 0.79<BFL/TL<0.99; where, BFL is the back focal length of the projection lens system, and TL is the overall length of the projection lens system on the optical axis from a screen side of the first lens element to a light-valve side of the fourth lens element.

Abstract: A plano-Fresnel LED lens and a LED assembly thereof are revealed. The lens is a Fresnel lens whose optical surface on the forward side thereof is a plano surface having saw teeth with vertical taper (draft with vertical shape) so that the lens in the LED assembly concentrates light emitted from a LED chip to generate light whose peak intensity is an elliptic distribution pattern. Moreover, the lens and the LED assembly thereof satisfy certain conditions. Thereby, light from the LED chip is gathered by a single lens to form a preset specific distribution pattern and is satisfying requirement of the ratio of the luminous flux that is larger than 85%. The plano-Fresnel LED lens and a LED assembly thereof are applied to lights and flashlights in mobile phones or cameras.

Abstract: A compact zoom lens with three lens groups and a design method thereof. Along the optical axis from the object side to the image side, the compact zoom lens with three lens groups includes a negative power first lens group having a negative power first lens and a positive power second lens, a positive power second lens group having a positive power third lens, a negative power fourth lens leaned with the third lens and a positive power fifth lens, and a third lens group having a positive power sixth lens. The zoom lens matches requirements of optical properties for aberration correction. Minimum change of the distance between the first lens of the first lens group and the image forming plane from the WIDE position to the TELE position is used as the objective function of optimization.

Abstract: A compact auto focus lens module includes a piezoelectric actuator, an elastic element, at least two guiding fixtures, and a lens barrel with an optical lens set therein. By elastic force of the elastic element, a friction is generated between the lens barrel and the piezoelectric actuator. While being applied with a voltage, the lens barrel driven by the movement of the piezoelectric actuator moves along the optical axis under the guidance of the guiding fixtures. Due to fewer elements, compact volume, and light weight, the design is applied to a miniature auto focus lens modules so as to achieve effects of fast movement, stable focusing and reduced tilting.

Abstract: A rain sensor mounted on a windshield of a vehicle comprises: a housing having an opening, at least an emitter disposed in the housing and used for emitting light beams, a coupler, and an optical detector. The coupler connecting and covering the opening of the housing, comprises: at least a collimator receiving and collimating the light beams into collimated light beams; and at least a groove having a deflection surface to reflect the collimated light beams that passes through the collimator and is incident to the deflection surface at an incident angle ? to the windshield. The optical detector disposed in the housing is used for receiving the collimated light beams reflected by the windshield and generating electrical signals. The present invention characterized in that the incident angle ? satisfies the following condition: 1.27<n*sin ?<1.52, wherein n is refractive index of the coupler.

Abstract: A two-element f-? lens used for a micro-electro mechanical system (MEMS) laser scanning unit includes a first lens and a second lens, the first lens is a positive refraction meniscus lens of which the convex surface is disposed on a side of a MEMS mirror, the second lens is a positive refraction meniscus lens of which the convex surface is disposed on the side of the MEMS mirror, at least one optical surface is an Aspherical surface in both main scanning direction and sub scanning direction, and satisfies special optical conditions. The two-element f-? lens corrects the nonlinear relationship between scanned angle and time into the linear relationship between image spot distances and time. The two-element f-? lens focuses the scan light to the target in the main scanning and sub scanning directions, such that the purpose of the scanning linearity effect and the high resolution scanning can be achieved.

Abstract: A two-element f-? lens used for a micro-electro mechanical system (MEMS) laser scanning unit includes a first lens and a second lens, the first lens is a positive refraction meniscus lens of which the convex surface is disposed on a side of a MEMS mirror, the second lens is a positive refraction meniscus lens of which the concave surface is disposed on the side of the MEMS mirror, at least one optical surface is an Aspherical surface in both main scanning direction and sub scanning direction, and satisfies special optical conditions. The two-element f-? lens corrects the nonlinear relationship between scanned angle and time into the linear relationship between image spot distances and time. The two-element f-? lens focuses the scan light to the target in the main scanning and sun scanning directions, such that the purpose of the scanning linearity effect and the high resolution scanning can be achieved.

Abstract: A molded fluorescent plastic lens and a manufacturing method thereof are disclosed. The fluorescent material 3 is attached on surface of plastic preform or a cavity of a mold core of a mold. By plastic molding, the plastic preform is heated, pressured and cast into a molded fluorescent plastic lens with a fluorescent surface. Thus the molded fluorescent plastic lens not only has shape and optical properties of the molded forming lens, but also has fluorescent properties from a fluorescent surface layer formed by fluorescent material inserted into the plastic. Thus the produced molded fluorescent plastic lens is applied to road reflectors, white light LED or other optical elements for use.

Abstract: A miniature stacked glass lens module is disclosed. The miniature stacked glass lens module includes at least one stacked optical glass lens element, a lens holder and other optical element. The stacked optical glass lens element is formed by cutting along alignment notches on a glued and stacked optical glass lens array. Then the stacked optical glass lens element and other optical element are mounted into the lens holder to form a miniature stacked glass lens module. Thereby the precise alignment of the optical axis of the lens in the lens module can be achieved. The manufacturing processes of the lens module can be simplified dramatically and the manufacturing cost is reduced significantly.