Abstract: A lens assembly includes a first lens and a second lens. The first lens includes an optical axis, and a first engaging face facing toward the optical axis and a first engaging structure formed on the first engaging face. The second lens is used for engagement with and coaxially alignment with the first lens. The second lens includes a second engaging face facing away from the optical axis and a second engaging structure formed on the second engaging face for engagement with the first engaging structure of the first lens. The second lens is rotatable about the axis but non-movable along the optical axis relative to the first lens when the second lens is engaged with the first lens.

Abstract: A camera module includes a lens barrel assembly and a lens holder. The lens assembly includes a lens barrel and a lens received in the lens barrel. The lens include an optical axis. The lens barrel defines a recess in a sidewall of the lens barrel. The barrel holder includes a peripheral sidewall, an inner flange formed on an inner surface of the peripheral sidewall, and a protrusion extending from the inner flange. The peripheral sidewall of the barrel holder is threadedly engaged with the lens barrel. The protrusion extends in a direction parallel to the optical axis and is inserted in the recess.

Abstract: An injection mold for molding a lens barrel is disclosed. The injection mold includes a female die, a male die and a screw die. The female die and the male die are correspondingly connected to two ends of the screw die. The female die, the male die and the screw die cooperatively define a mold cavity. The female die includes a female die plate and a female die core protruding from the female die plate. The male die includes a male die plate and a male die core protruding from the male die plate. The male die defines a through hole passing through the male die plate and the male die core. An air gap is formed between the distal ends of female die core and the male die core, the air gap is communicated with the mold cavity and the through hole.

Abstract: A camera module includes a lens barrel, a first lens and a second lens. The lens barrel includes a substantially cylindrical inner wall. The first lens is received in the lens barrel. The first lens includes a first circumferential side surface spaced from the inner wall. The second lens is engaged with the first lens and received in the lens barrel. The second lens includes a second circumferential side surface. The second circumferential side surface has a first portion contacting the inner wall and a second portion spaced from the inner wall, thus a gap defined between the second portion and the inner wall. Adhesive is applied in the gap between the second portion and the inner wall.

Abstract: An apparatus for grinding a threaded portion of a workpiece, is provided. The threaded portion has a spiral groove formed therein. The apparatus includes a motor, a grinding cord, a detector and a controller. The motor has a rotary portion for rotating the threaded portion of the workpiece about an axis. The grinding cord is configured for being looped around the threaded portion of the workpiece with a middle part thereof engagingly received in a given portion of turns of the spiral groove for grinding the thread portion of the workpiece. The detector is for detecting a rotating cycle of the rotary portion. The controller is communicatively coupled to the detector for controlling the rotary portion to selectively rotate in a first rotating direction or in a reverse second rotating direction based on the received signal from the detector.

Abstract: A lens module includes a lens barrel and a lens holder. The lens barrel includes a barrel. The barrel includes an outer surface and an outer thread portion formed on the outer surface. The lens holder includes a main body. The main body defines a receiving space to receive the lens barrel. An inner thread portion matching the outer thread portion is formed on an inner surface of the receiving space. The angle between the outer surface of the lens barrel and an optical axis of the lens module is different from the angle between the inner surface of the receiving space and the optical axis of the lens module.

Abstract: A camera module includes a lens barrel, a first lens and a second lens. The lens barrel includes a substantially cylindrical inner wall. The first lens is received in the lens barrel. The first lens includes a first circumferential side surface spaced from the inner wall. The second lens is engaged with the first lens and received in the lens barrel. The second lens includes a second circumferential side surface. The second circumferential side surface has a first portion contacting the inner wall and a second portion spaced from the inner wall, thus a gap defined between the second portion and the inner wall. Adhesive is applied in the gap between the second portion and the inner wall.

Abstract: An exemplary optical pen includes a body, an infrared light source received in the body, a converging lens unit, and a tip. The converging lens unit is received in the body and is positioned along the light path of infrared light emitted from the infrared light source, and is configured for converging the infrared light. The tip includes a receiving end and a handwriting end at opposite sides thereof and defines a through hole extending from the receiving end to the handwriting end. The receiving end is received in the body and is configured for fixing the converging lens unit. The handwriting end protrudes from the body and is configured for projecting the converged infrared light.

Abstract: A lens assembly includes a first lens and a second lens. The first lens includes an optical axis, and a first engaging face facing toward the optical axis and a first engaging structure formed on the first engaging face. The second lens is used for engagement with and coaxially alignment with the first lens. The second lens includes a second engaging face facing away from the optical axis and a second engaging structure formed on the second engaging face for engagement with the first engaging structure of the first lens. The second lens is rotatable about the axis but non-movable along the optical axis relative to the first lens when the second lens is engaged with the first lens.

Abstract: A fixed-focus lens module includes an outer lens barrel, an inner lens, a first lens, and a second lens group. The outer lens barrel includes a first open end, a first cavity, and a second open end arranged in the order from the object side to the image side of the outer lens barrel. The inner lens barrel is received in the outer lens barrel adjacent to the first open end. The first lens is received in the inner lens barrel. The second lens group is received in the outer lens barrel adjacent to the second open end. An gap is defined between an outer wall of the inner lens barrel and an inner wall of the outer lens barrel at the first open end, and the center axis of the inner lens barrel is adjustable relative to the outer lens barrel for adjusting the alignment between the first lens and the second lens group.

Abstract: An aperture stop includes a body and a black film. The body is stainless steel and the black film is disposed on at least two corresponding ends of the body. A manufacturing method of the aperture stop is also provided. The aperture stop is produced using the characteristics of the stainless steel body.

Abstract: A clamping device including a back frame and a top cover is provided. The back frame includes a first body and a first sidewall, wherein the first sidewall is connected to the first body in a substantially vertical manner. The top cover includes a second body and a second sidewall, wherein the second sidewall is connected to the second body in a substantially vertical manner. When the top cover is assembled to the back frame, the second sidewall leans closely against the first sidewall, and the first body is opposite to the second body. The second body includes a main part and a concave part connecting together, wherein the distance from the concave part to the first body is shorter than the distance from the main part to the first body. Furthermore, a backlight module and a display apparatus that utilize the clamping device are also provided.

Abstract: A camera module includes a lens barrel assembly and a lens holder. The lens assembly includes a lens barrel and a lens received in the lens barrel. The lens include an optical axis. The lens barrel defines a recess in a sidewall of the lens barrel. The barrel holder includes a peripheral sidewall, an inner flange formed on an inner surface of the peripheral sidewall, and a protrusion extending from the inner flange. The peripheral sidewall of the barrel holder is threadedly engaged with the lens barrel. The protrusion extends in a direction parallel to the optical axis and is inserted in the recess.

Abstract: A lens module includes a lens barrel and a lens holder. The lens barrel includes a barrel. The barrel includes an outer surface and an outer thread portion formed on the outer surface. The lens holder includes a main body. The main body defines a receiving space to receive the lens barrel. An inner thread portion matching the outer thread portion is formed on an inner surface of the receiving space. The angle between the outer surface of the lens barrel and an optical axis of the lens module is different from the angle between the inner surface of the receiving space and the optical axis of the lens module.

Abstract: An injection mold for molding a lens barrel is disclosed. The injection mold includes a female die, a male die and a screw die. The female die and the male die are correspondingly connected to two ends of the screw die. The female die, the male die and the screw die cooperatively define a mold cavity. The female die includes a female die plate and a female die core protruding from the female die plate. The male die includes a male die plate and a male die core protruding from the male die plate. The male die defines a through hole passing through the male die plate and the male die core. An air gap is formed between the distal ends of female die core and the male die core, the air gap is communicated with the mold cavity and the through hole.

Abstract: The invention provides polynucleotides and polypeptides encoded therefrom having advantageous properties, including an ability of the polypeptides to preferentially bind a CD28 or CTLA-4 receptor at a level greater or less than the ability of human B7-1 to bind CD28 or CTLA-4, or to induce or inhibit altered level of T cell proliferation response greater compared to that generated by human B7-1. The polypeptides and polynucleotides of the invention are useful in therapeutic and prophylactic treatment methods, gene therapy applications, and vaccines.

Abstract: A light source set including a light cover has an opening, a first side and a second side, a first circuit board disposed on the first side, a plurality of first point light sources disposed on the first circuit board, a second circuit board disposed on the second side and a plurality of second point light sources disposed on the second circuit board is provided. The first side and the second side are located at two opposite sides of the opening. Each first point light source has a first light-emitting surface facing to the opening and a first top surface departing from the first circuit board. Each second point light source has a second light-emitting surface facing to the opening. A distance between the first top surface and the second circuit board is smaller than a height of the second point light sources.

Abstract: A lamp housing includes a top plate and sidewalls. The top plate includes a first edge, a second edge, a first group of top-plate dissipation slots and a plurality of second top-plate dissipation slots. The first edge is opposite to the second edge. Each top-plate dissipation slot has the same width, and is rectangular. Each one of the plurality of first top-plate dissipation slots is separated by two widths thereof, and each of the plurality of second top-plate dissipation slots is separated by two widths thereof. The plurality of first top-plate dissipation slots is parallel and 20 to 24 slot widths away from the first edge toward the center of the top plate, and the plurality of second dissipation slots is parallel and 14 to 18 slot widths away from the second edge. A plurality of sidewall dissipation slots is provided on the sidewalls.

Abstract: An aperture stop includes a body and a black film. The body is stainless steel and the black film is disposed on at least two corresponding ends of the body. A manufacturing method of the aperture stop is also provided. The aperture stop is produced using the characteristics of the stainless steel body.

Abstract: The invention provides polynucleotides and polypeptides encoded therefrom having advantageous properties, including an ability of the polypeptides to preferentially bind a CD28 or CTLA-4 receptor at a level greater or less than the ability of human B7-1 to bind CD28 or CTLA-4, or to induce or inhibit altered level of T cell proliferation response greater compared to that generated by human B7-1. The polypeptides and polynucleotides of the invention are useful in therapeutic and prophylactic treatment methods, gene therapy applications, and vaccines.