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 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.

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 fixed-focus lens includes an anti-radiation first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in order in a direction. An aperture stop is disposed between the first lens and the fourth lens. A ratio of a lens diameter of the first lens to an overall length is within a range of 0.4 to 0.5, where the overall length is an axial distance between an outer surface of the first lens and an outer surface of the seventh lens. Each of the first lens to the seventh lens is a spherical glass lens.

An optical lens includes a first lens, a second lens, a third lens, a fourth lens and a cemented lens. The first lens is closest to a magnified side as compared with any other lens of the optical lens, one of the second lens and the third lens is a first aspheric lens, and the fourth lens is a second aspheric lens and disposed between the cemented lens and a minified side of the optical lens. The optical lens satisfies the condition: 1.0<D 1 /DL<4.0, where D 1 denotes a lens diameter of the first lens and DL denotes a lens diameter of the fourth lens.

A zoom lens arranged along an optical axis includes a first lens group and a second lens group. The second lens group has at least one aspheric lens. The first lens group moves toward an image side and the second lens group moves away from the image side along the optical axis during zooming. The first lens group is moved for focusing, and the second lens group is moved for zooming.

A de-speckle mechanism includes a carrier, an optical homogenizer, an outer frame, a first flexible component, and a first actuator. The optical homogenizer is provided with a light-receiving surface and is disposed on the carrier. The outer frame is disposed adjacent to the carrier. The first flexible component is the only component connecting the carrier and the outer frame. The first actuator includes a first part and a second part which act relative to each other, and the first part is disposed on the carrier. The first actuator can drive the optical homogenizer, with the connecting position between the first flexible component and the outer frame as the fulcrum, so that the optical homogenizer can swing in a plane direction substantially parallel to or identical to the light-receiving surface of the optical homogenizer.

The invention discloses a projection lens. The projection lens includes a first lens with refractive power, a second lens with refractive power, a third lens with refractive power, a fourth lens with refractive power and a fifth lens with refractive power in order from an magnification side to a reduction side of the projection lens. An aperture stop is disposed between the second lens and the reduction side, wherein a number of the lenses refractive power of the projection lens is less than 12, and at least one of the second lens, the third lens, the fourth lens and the fifth lens is a gradient index lens, which satisfies the condition of 0.6>T/D>0.035.

A fixed-focus imaging lens includes a first lens group, an aperture stop and a second lens group arranged in order from an object side to an image side of the fixed-focus imaging lens. A focal plane for visible light with a wavelength of 550 nm along an optical axis of the imaging lens is less than 0.01 mm. The fixed-focus imaging lens satisfies a condition of 45<LT/GD, where LT is a distance measured along the optical axis between two outermost lens surfaces with refractive powers at opposite ends of the imaging lens, and GD is a distance measured along the optical axis between the first lens group and the second lens group.