Young Optics Inc.

A projection lens includes a first lens group, an aperture stop and a second lens group arranged in order from a magnified side to a minified side. The projection lens satisfies the following conditions: (1) 0.2<BFL/EFL<0.6, where EFL is an effective focal length of the projection lens, and BFL is a back focal length of the projection lens; and (2) an axial distance between any pair of lenses in the projection lens remains constant during operation.

An imaging lens includes a first lens group and a second lens group. The first lens group includes three lenses with refractive powers, where two of three lenses of the first lens group are aspheric lenses. The second lens group includes three lenses with refractive powers, where one of three lenses is an aspheric lens and other two lenses are paired to form a doublet lens. The imaging lens satisfies conditions of 3.0<LT/IMH<3.5 and 1.0<D1/LT<1.08, where IMH is a semi-diagonal image height of the imaging lens, D1 is a lens diameter of a lens closest to an object side of the imaging lens, and LT is a distance measured along an optical axis between two outermost lens surfaces with refractive powers at opposite ends of the imaging lens.

A vehicle projection lens includes an aspheric first lens, a cemented lens consisting of a spherical second lens and a spherical third lens, and a spherical fourth lens in order from a magnified side to a minified side. An F-number of the vehicle projection lens is smaller than or equal to 0.86, a field of view of the vehicle projection lens is greater than 14 degrees and smaller than 44 degrees, and the vehicle projection lens consists essentially of four lenses respectively with positive, negative, positive and positive refractive powers.

A lens array with measurement structures includes a first lens surface and a second lens surface opposite to each other and arranged along a first direction. The first lens surface has a first feature structure, a second feature structure and a third feature structure, and the second lens surface has a fourth feature structure, a fifth feature structure and a sixth feature structure corresponding respectively to the first feature structure, the second feature structure and the third feature structure. A shape center of the first feature structure is offset from that of the fourth feature structure, a shape center of the second feature structure is offset from that of the fifth feature structure, and a shape center of the third feature structure is offset from that of a sixth feature structure relative to the first direction.

A vehicle projection lens includes an aspheric first lens with a positive refractive power, a cemented lens comprised of a spherical second lens and a spherical third lens, and a spherical fourth lens with a positive refractive power arranged in order from a magnified side to a minified side. The vehicle projection lens satisfies the following conditions: (1) an aperture stop is disposed between the third lens and the fourth lens; (2) an F-number of the vehicle projection lens is less than or equal to 0.86; (3) a full field of view of the vehicle projection lens ranges from 30 to 70 degrees; and (4) an effective focal length of the vehicle projection lens ranges from 13 mm to 28 mm.

An imaging lens including a first lens group, a second lens group, and an aperture stop disposed between the first lens group and the second lens group is provided. The first lens group includes at least one and at most three lenses with refractive powers, and the second lens group has a positive refractive power and includes at least two and at most three lenses with a refractive powers. The imaging lens satisfies conditions of 2 mm<LT<20 mm and 0.8<D1/LT<1.4, where D1 is a lens diameter of the lens closest to the object side, and LT is distance along the optical axis between two outermost lens surfaces at opposite ends of the first lens group and the second lens group.

A three-dimensional printer includes a printer main body, a printer chassis and an optical module. The printer main body includes a tank for accommodating a photosensitive material, a light-transmissive plate located at a bottom of the tank, and a printing platform adjacent to the tank. The printer chassis includes at least one base plate and defines a storage space outwardly connected to an external environment. The optical module is capable of being detached from the printer main body, the optical module is capable of being fixed in the storage space, and the optical module is capable of being entirely withdrawn from the storage space to the external environment in a single motion.

A 3D printing apparatus including a base plate, a transparent plate, a fluid space, a molding container, a heater, a fluid guider and a light engine is provided. The fluid space is disposed between the base plate and the transparent plate. The molding container has an accommodating space and the base plate is disposed in the accommodating space. The heater is configured to heat a fluid. The fluid guider is configured to guide the heated fluid into the fluid space. The light engine is configured to project a pixelated light on the base plate.

An optical lens includes an aperture, a first lens, a second lens, a third lens, and a fourth lens sequentially in a direction. One of the first lens and the second lens has positive refracting power, and the other has negative refracting power. The third lens has refracting power, and is a lens with a largest diameter in the optical lens. The fourth lens has the refracting power. The four lenses are made of glass. For light having a wavelength of 1315 nm, a transmittance of the optical lens is greater than ninety percent.

An imaging lens including an aperture stop, a first lens, a second lens and a third lens sequentially arranged along an optical axis from an object side to an image side is provided. The first lens is an aspheric glass lens and has positive refracting power. The second lens is an aspheric plastic lens. The third lens is an aspheric plastic lens. The imaging lens has the transmittance higher than 85% for light with a wavelength of 940 nm and has the field of view less than 90 degrees.