Abstract: A light guide plate includes an incident surface, an emitting surface, and a reflecting surface opposite to the emitting surface. The incident surface connects the emitting surface to the reflecting surface. A plurality of microstructures is defined in the reflecting surface. Each microstructure is a slot. A cross-section across each microstructure and parallel to a light emitting direction is substantially V-shaped. Each microstructure is formed with two sidewalls. Each sidewall includes a plurality of stepped portions connected in order.

Abstract: A lens includes a bottom face, a light incident face formed in the bottom face, a light emerging face opposite to the bottom face and a lateral face formed between the bottom face and the light emerging face. A light diverging protrusion is formed on the light incident face. The light diverging protrusion has a conical face gradually shrinking away from the light emerging face. An LED unit incorporating the lens is also disclosed.

Abstract: The present disclose relates to light source device, which including a light source and a lens opposite to the light source. The lens includes a bottom surface, a light input surface, a top surface and a side surface. The light input surface depresses from the bottom surface towards a top surface of the lens. The light input surface is an aspheric surface. The top surface is opposite and parallel to the bottom surface. The side surface connects the bottom surface and the top surface. The side surface is a curved surface formed by rotating a curve line about the central axis of the lens. Light emitted from the light source enters the lens and is refracted by the side surface and the top surface of the lens to outside.

Abstract: A light source module includes a light source and an optical lens facing the light source. The optical lens includes a light incident surface facing the light source, and a light emitting face opposite to the light incident face. The light emitted from the light source is entered into the optical lens from the light incident face, and exited from the light emitting face. A refractive index of the optical lens gradually decreases along a direction from the light incident face to the light emitting face of the optical lens.

Abstract: A lens for an LED backlight module includes a main lens body and a diffusion structure consisting of a plurality of micro lenses. The main lens body includes a light incident face for receiving light from an LED light source and a light exit face opposite to the light incident face thereof. Light leaves the lens from the light exit face. The micro lenses of the diffusion structure are formed on the light exit face of the main lens body. Each micro lens is annular and has a generally triangular cross section. Each micro lens includes a first light scattering surface and a second light scattering surface intersecting with the first light scattering surface. The micro lenses are arranged in a series of concentric circles with regard to a center of the lens. A backlight module source incorporating the lens and the LED light source is also provided.

Abstract: A light guide plate includes a light incident surface and a plurality of micro cylinders protruding from the light incident surface in parallel. Each of the micro cylinders has a circumference surface and two opposite end surfaces. The circumference surface is connected to the light incident surface. The two end surfaces are positioned on two opposite ends of the circumference surface, and are perpendicular to the light incident surface. Each of the two end surfaces is circular arc-shaped, and the radius of each of the two end surfaces is in the range of 0.04 ?m to 0.07 ?m.

Abstract: A light source module includes a light source and an optical lens facing the light source. The optical lens includes a light incident surface facing the light source, and a light emitting face opposite to the light incident face. The light emitted from the light source is entered into the optical lens from the light incident face, and exited from the light emitting face. A refractive index of the optical lens gradually decreases along a direction from the light incident face to the light emitting face of the optical lens.

Abstract: The present disclose relates to a lens unit. The lens unit includes a first lens and a second lens. The first lens includes a first light input surface, a first light output surface opposite to the first light input surface and a first side surface connected to the first light output surface. The first lens has a first refractive index. The second lens defines a cavity at a light input surface thereof for receiving the first lens. The second light output surface of the second lens contacts the first light output surface and the first side surface of the first lens. The second lens has a second refractive index which less than the first refractive index. The present disclose also relates to a light source module with the lens unit.

Abstract: A light guide plate includes a light incident face, a bottom face adjacent to the light incident face and a light exit face opposite to the bottom face. The micro lenses are formed on the light incident face in series to diffuse light incident thereon. Two adjacent micro lenses cooperatively define a V-shaped groove therebetween. Each groove defines an opening. The width of the openings of the grooves gradually changes from a center of the light incident face toward lateral sides thereof. A backlight module incorporating the light guide plate is also provided.

Abstract: A lens includes a bottom face, a light incident face formed in the bottom face, a light emerging face opposite to the bottom face and a lateral face formed between the bottom face and the light emerging face. A light diverging protrusion is formed on the light incident face. The light diverging protrusion has a conical face gradually shrinking away from the light emerging face. An LED unit incorporating the lens is also disclosed.

Abstract: A lens includes a first optical layer, a second optical layer covering the first optical layer and a third optical layer covering the second optical layer. The first optical layer has a light refractive index larger than that of the second optical layer. The second optical layer has a light refractive index larger than that of the third optical layer.

Abstract: A lens includes a light incident face, a light exit face opposite to the light incident face and a plurality of annular stepwise portions formed on the light exit face. The stepwise portions are located at or near a periphery of the light exit face and each stepwise portion has an annular flat surface. A plurality of micro patterns are arranged on the flat surface of one stepwise portion to scatter light exiting from the periphery of the light exit face. A light source module incorporating the lens is also provided. The light source module includes an LED light source. Light from the LED light source enters the lens from the light incident face and leaves the lens from the light exit face after the light is divergently refracted by the lens.

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.