Abstract: A lens includes a first optical layer, a second optical layer and a third optical layer sequentially stacked. The third optical layer has a light refractive index larger than that of the second optical layer, and the second optical layer has a light refractive layer larger than that of the first optical layer. A method for making the lens is also provided.

Abstract: A light guide plate includes a light incident surface, a bottom plate, a light emitting surface opposite to the bottom plate, and a side surface opposite to the light incident surface. The light incident surface is perpendicular to the light emitting surface. The bottom surface is imaginarily divided into rectangular sub-portions which are equal in area and shape. A portion of the sub-portions close to the side surface constitutes a main portion. Each sub-portion uniformly distributes micro protrusions. Along a direction from the light incident surface to the side surface, the micro protrusion densities of the sub-portions of the main portion gradually ascend, and the difference values of the micro protrusion densities of any two adjacent sub-portions of the main portion gradually ascend.

Abstract: An optical lens for adjusting viewing angle of and diffusing light emitted from a light emitting diode includes a light incident surface and a light emitting surface. The light incident surface is cone-shaped and concave towards the light emitting surface. The light emitting surface is cone-shaped and concave towards the light incident surface. A plurality of annular protrusions is formed on the light incident surface. The annular protrusions are coaxial and a center of each of the annular protrusions is located at an optical axis passing through a vertex of the light emitting surface and a vertex of the light incident surface. A lighting device having the optical lens and the light emitting diode is also provided.

Abstract: A method includes having test plate and light source, the test plate having matrix of first pattern-dots and equally divided into blocks. Intersecting surfaces between the first pattern-dots and the first bottom surface have the same radius rx. Detecting a luminous flux ?X of each block and a total luminous flux ?t of the test plate when light source is activated; calculating an average luminous flux ?ave; calculating the radius rx1 of the first pattern-dots in each block assuming that an actual luminous flux of each block is equal to the average luminous flux according to the formula rx1=rx×sqrt (?ave/?X). Providing a substrate having the same structure as the base and the substrate being divided into blocks according to the same principle as the test plate. Forming second pattern-dots having the same arrangements as the first pattern-dots and having radius of rx1 in each block.

Abstract: A method for designing a lens is disclosed. Multiple coordinates of an optical face of the lens are set according to formulas of Xn=Xn?1+Dn?1; and Yn=Yn?1+Kn?1*Dn?1. The coordinates are then connected by lines to form a primary curve of the optical face. A test is made to the primary curve to find unsatisfied coordinates. The unsatisfied coordinates are updated by amending the slopes thereof. The updated coordinates are then connected with the unchanged coordinates by lines to obtain an update curve. The update curve is further tested and amended until a satisfied curve is obtained.

Abstract: A light guide bar includes a light guide member and a light scattering member. The light guide member defines a cutout. The light guide member includes a first end surface, a second end surface, and a circumferential surface interconnected between the first end surface and the second end surface. The cutout is defined in the circumferential surface and passes through the first end surface and the second end surface. The light scattering member is received in the cutout and scatters light back to the light guide member. The light scattering member and the light guide member cooperatively form a complete cylinder, and a thickness of the light scattering member is less than a radius of the light guide member.

Abstract: A direct-type LED backlight module includes a backlight plate, an LED mounted on the backlight plate to emit light, and a lens mounted on the backlight plate and encapsulating the LED therein. The lens includes a light input part to allow the light in, a light output part extending from a top surface of the light input part to allow the light radiate out from a periphery thereof, and a microstructure formed on a bottom surface of the light input part to reflect a part of light reflected by the light output part to make the reflected light travel through a central portion of the light output part.

Abstract: An optical connector includes a printed circuit board, at least one emitter, at least one receiver, a coupler, and a number of positioning poles. The printed circuit board includes an assembling surface defining a number of first positioning recesses therein. The emitter and the receiver are electrically connected to the assembling surface of the printed circuit board. The coupler includes a bottom surface facing toward to the printed circuit board and at least two first lenses corresponding to the emitter and the receiver. The coupler defining a number of second positioning recesses in the bottom surface corresponding to the first positioning recesses. The positioning poles are positioned between the printed circuit board and the coupler, with one end of each positioning pole inserting and being fixed into a first positioning recess and the other end of each positioning pole inserting and being fixed into a second positioning recess.

Abstract: A light guiding plate includes a bottom surface, a light emitting surface opposite to the bottom surface, and a light incident surface perpendicularly connected between the bottom surface and the light emitting surface. The light guiding plate defines a plurality of recesses in the light incident surface. Each recess includes a concave surface, and the concave surface is connected between the light emitting surface and the bottom surface. Each concave surface forms a smooth curve on the light emitting surface. A distance between two points of the smooth curve the same distance away from the light incident surface gradually decreases along a direction away from the light incident surface.

Abstract: A light diffuser for a backlight module includes a main body, a diffusing micro-structure, and a micro-prism structure. The main body includes a light incident surface and a light emergent surface opposite to the light incident surface, the diffusing micro-structure is formed on the light incident surface, and the micro-prism structure is formed on the light emergent surface. The diffusing micro-structure includes a number of protrusions. The protrusions are substantially semi-cylindrical-shaped, and the prisms are substantially parallel to each other. The micro-prism structure includes a number of prisms, and the prisms are substantially parallel to each other.

Abstract: A light guiding element includes at least one fixing element and a number of light guiding pipes positioned on the fixing element. Each light guiding pipe includes a light guiding portion and a light scattering portion. The light guiding portion includes a first side surface, and a receiving recess is defined in the first side surface. A refractive index of the light guiding portion is greater than that of air. The light scattering portion includes a second side surface, and a protrusion protrudes from the second side surface. A plurality of diffusion particles are uniformly distributed in the light scattering portion. A refractive index of the light scattering portion is greater than that of air. The protrusion is received in the receiving recess.

Abstract: A light guide plate includes a main body and a number of transparent particles. The main body includes a light incident surface, and defines a micro structure in the light incident surface. The transparent particles are made of material with a refraction index greater than the refraction index of the material of the main body and are attached on the light incident surface in the micro structure.

Abstract: A wavefront measuring system with large dynamic measuring range includes a measuring unit, a control unit, and a processing unit. The measuring unit includes a wavefront dividing component, a focusing component and a photosensor. The wavefront dividing component samples a part of a laser beam (a sampled light beam) in a measuring plane, the focusing component focuses the sampled light beam on a photosensitive surface of the photosensor to form a light spot, the photosensor detects the presence of the light spot, the data processing unit acquires the locational information of the light spot and calculates the direction of the sampled light beam beam. The control unit drives the measuring unit to a different position in the same measuring plane, the wavefront dividing component samples another sampled light beam. The data processing unit calculates the wavefront distribution on the measuring plane based on the direction determined sampled light beams.

Abstract: A lens, which is integrally formed as a single piece, includes a base, a first light diffusion portion and a second light diffusion portion formed on the base. A receiving hole is defined in the second light diffusion portion. The first light diffusion portion is received in the receiving hole, and an inner surface of the receiving hole is spaced from a top surface and a periphery side surface of the first light diffusion portion. A recess is defined in the first light diffusion portion for receiving an LED therein. The first and second light diffusion portions have different light diffusion (refraction) capabilities. The present disclosure also relates an LED light module using the lens.

Abstract: A lens module for divergently refracting light from an LED includes a first lens and a second lens matching with the first lens. The first lens is received in the second lens, and the first lens is spaced from the second lens. The LED is received in the first lens. A central axis of the first lens coincides with a central axis of the second lens. Light emitted from the LED and into the lens module is refracted out by the first lens and the second lens. The first and second lenses have different capabilities of refraction. This disclosure also relates an LED lighting module with the lens module.

Abstract: A light guide plate includes a light emitting surface, a bottom surface opposite to the light emitting surface, a light incident surface, and a side surface opposite to the light incident surface. The bottom surface is imaginarily divided into a plurality of rectangular portions along a direction from the light incident surface to the side surface. The shapes of the rectangular portions are the same as each other. Each of the rectangular portions distributes a plurality of microstructures. The rectangular portions are assigned serial numbers along the direction from the light incident surface to the side surface. The microstructure density in each of the rectangular portions between the first rectangular portion and the last rectangular portion satisfies the formula: ai=(ai?1+ai+ai+1)/3, where i represents the serial number of the rectangular portion, N represents the total number of the rectangular portions, 1<i<N, and i and N are natural numbers.

Abstract: A backlight module comprises a light guide plate, a plurality of light guide portions, and a plurality of light sources. Each light guide portion is wedge-shaped. Each light guide portion comprises a first side surface and a second side surface opposite to the first side surface. The second side surface is in contact with the light guide plate. Along a direction perpendicular to the light guide plate, a thickness of the first side surface is greater than a thickness of the second side surface. A receiving groove is defined on the first side surface. Each light source is received in a corresponding one of the receiving grooves.

Abstract: The feeding system for an injection molding machine includes a drying barrel, a suction pipe, and a pressing cover. The injection molding machine includes a feeding pipe. The drying barrel is configured for receiving material used in the injection molding machine. The suction pipe is connected between the feeding pipe and the drying barrel. The material is configured to be introduced into the feeding pipe through the suction pipe. The pressing cover is slidably received in the drying barrel and configured for pressing the material to squeeze out air existing in the material.

Abstract: A lens adjusts light emitted from a light source that emits the light in upward directions whereby light intensity of the adjusted light at a lateral side of the light source is increased. The lens includes a bottom surface and a top surface extending from an edge of the bottom surface. A first cavity recesses upwardly from the bottom surface for receiving a light source therein. An inner surface of the first cavity acts as a light inputting surface. A first dispersing portion protrudes downwardly from a top end of the light inputting surface. The light inputting surface collects light from the light source, the first dispersing portion disperses part of light from the light inputting surface and transmits the light to lateral sides of the light inputting surface and lateral sides of the top surface to illuminate.

Abstract: A light guide plate includes a light incident surface, a light exit surface; and a bottom surface opposite the light exit surface. The light incident surface includes many first micro structures and many second micro structures. Each second micro structure cover some of the first micro structures.