39results about How to "Shortened back focus" patented technology

An optical imaging lens assembly includes, in order from the object side to the image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element with positive refractive power has a convex object-side surface in a paraxial region. The fourth lens element with negative refractive power has a concave object-side surface in a paraxial region. The fifth lens element with positive refractive power has a convex image-side surface in a paraxial region. The sixth lens element with negative refractive power has a concave object-side surface in a paraxial region, a concave image-side surface in a paraxial region and at least one convex shape in the off-axial region of the image-side surface of the sixth lens element. The fifth lens element and the sixth lens element are aspheric lens elements.

The invention discloses an optical image system, an image capturing device and an electronic device. The optical image system includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof. The second lens element has an image-side surface being concave in a paraxial region thereof. The third lens element has negative refractive power. The fifth lens element with negative refractive power has an object-side surface and an image-side surface being both aspheric. The sixth lens element has an object-side surface and an image-side surface being both aspheric.

A photographing optical lens assembly includes, in order from object side to image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element with positive refractive power has object-side surface being convex in a paraxial region thereof. The second lens element has positive refractive power. The third and fourth lens elements have refractive power. The fifth lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof. An object-side surface and the image-side surface of the fifth lens element are aspheric. The sixth lens element with refractive power has an image-side surface being concave in a paraxial region thereof. When specific conditions are satisfied, it is easier to miniaturize the photographing optical lens assembly and achieve better image quality in a limited space.

A digital light processing projection system includes an illuminating device, an optical-path-switching element, a projection device and a prism set. The prism set is arranged between the illuminating device, the optical-path-switching element and the projection device and has a plurality of prisms in which an air gap existing between any two adjacent prisms. According to the invention, a light beam output from the illuminating device directly passes through the prisms and air gaps before being received by the optical-path-switching element. Under a first state, a light beam reflected from the optical-path-switching element is totally reflected at an interface between one of the prisms and one of the air gaps before being received by the projection lens. Under a second state, a light beam reflected from the optical-path-switching element is totally internal reflected back and forth within a prism being adjacent to the optical-path-switching element and is absorbed by a light absorbing material.

This invention provides an image capturing lens system comprising: a positive first lens element having a convex object-side surface; a negative second lens element having a concave object-side surface and a convex image-side surface; a third lens element with refractive power; a positive fourth lens element having a convex image-side surface, both of the object-side and image-side surfaces being aspheric; a fifth lens element with refractive power having a concave image-side surface, both of the object-side and image-side surfaces being aspheric, at least one inflection point is positioned on the image-side surface thereof. When some particular relations are satisfied, the light-focusing spots of various wavelengths can be favorably adjusted for extending the depth of field; therefore, the present image capturing lens system shall be suitable for compact electronic products with Extended Depth of Field (EDOF) function.

The invention discloses a photographing lens assembly, including a total of eight lens elements which are, in order from an object side to an image side: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element and an eighth lens element. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof. The second lens element has negative refractive power. The eighth lens element with negative refractive power has an object-side surface being concave in a paraxial region thereof. At least one lens element of the photographing lens assembly has at least one lens surface having at least one inflection point. When specific conditions are met, the photographing lens assembly can meet the requirements of miniaturization and high imaging quality at the same time. The invention further discloses an image capturing unit with the photographing lens assembly and an electronic device with the image capturing unit.

The invention provides an optical image capturing lens for a bar code reader, comprising a first lens of meniscus shape, with its convex surface on the object side and with the object side optical surface and the image side optical surface being aspherical surfaces, a second lens of meniscus shape, with its convex surface on the image side and with the object side optical surface and the image side optical surface being aspherical surfaces, and an image sensor. The image sensor is disposed on an imaging surface after combination of the first lens and the second lens and satisfies the relationship that 2 omega is greater than 62.0 degree and is less than 89.5 degree and TL / D1 / 2 is greater than 1.50 and less THAN 2.20, wherein the 2 omega represents diagonal angle of FOV, TL represents the distance from the object side optical surface of the first lens to the imaging surface, and D1 / 2 is a half of the length of a diagonal line of an effective sensing region of the image sensor. The optical image capturing lens for the bar code reader has shorter length, greater FOV, and excellent aberration correction capability.

The invention provides an optical lens system that comprises a first lens, a second lens, a third lens, a fourth lens, and a fifth lens from an object side to an image side in order. The first lens has positive refractive power and the object side surface of the first lens is a convex surface; the second lens has negative refractive power; the third lens has positive refractive power and the object side surface of the third lens is a convex surface; and the image side surface of the fifth lens is a recessed surface, the object side surface and the image side surface of the fifth lens are aspheric surfaces, and at leas one inflection point is arranged on the image side surface of the fifth lens. Therefore, according to the above-mentioned configuration mode of the lens set, a camera lens volume can be effectively reduced; sensitiveness of an optical system can be reduced; and high image interpreting power can be obtained.

An imaging lens assembly includes, in order from an object side to an image side, a first lens element with positive refractive power having a convex object-side surface, a second lens element with negative refractive power having a concave object-side surface and a concave image-side surface, a third lens element with positive refractive power having a concave object-side surface and a convex image-side surface, and a fourth lens element with negative refractive power having a concave object-side surface and a concave image-side surface. The third lens element and the fourth lens element are aspheric. The fourth lens element has at least one inflection point. By adjusting the distance between the second lens element and the first lens element as well as the thickness of the second lens element, the imaging lens assembly can be easy to be manufactured and assembled without decreasing its imaging quality.

The invention discloses a projection module, which comprises two or three transmission-type LCD light valves, a light combining device and a projection lens. When the number of the LCD light valves is three, the light combining device is an X prism, and the long side W of the display window of any LCD light valve is parallel to the central intersecting line A of the X prism; and when the number of the LCD light valves is two, light emitted by the first LCD light valve penetrates through the light combining device, and light emitted by the second LCD light valve is reflected by the light combining device. The invention further discloses a projector which comprises the projection module. The manufacturing difficulty of the light combining device can be obviously improved, the relatively low manufacturing cost can be realized, the size of the whole machine can be reduced, the appearance stacking of the whole machine can be changed, the manufacturing cost of the projection lens can be reduced, and the product competitiveness can be improved.

The present invention includes a reflection portion which light-modulates three primary color lights by three rectangular reflective liquid crystal light modulators, then color-combine the light-modulated lights and reflects the resultant light; and a projection lens which projects the reflected color-combined light onto a plane mirror. The three reflective light modulators are arranged in such a manner that their long side directions coincide with a perpendicular direction, and two of the three reflective light modulators are arranged in such a manner that their short side directions become parallel with a projecting direction of image light from a color separation / combination optical system.

In the projector 10, a projecting lens 11 and an illuminating optical system 15 are horizontally arranged in a line. A luminous flux emitted from an illuminating lamp 14 enters a cross dichroic prism (XDP) 13 via the illuminating optical system 15, and is separated into luminous fluxes of respective colors. The separate luminous fluxes of the respective colors enter corresponding liquid crystal panels 12R to 12B and re-enter the XDP 13 after the addition of image information to the respective luminous fluxes, and, thereby, they are composed. The XDP 13 can be miniaturized by disposing the intersection lines of dichroic films so as to be perpendicular to the short sides of a rectangular liquid crystal image face 12a. The intersection lines are disposed parallel to a horizontal direction when the projector is installed.