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

A reflective projection display system for receiving a light ray and projecting it onto a screen in a light-state mode. The reflective projection display system includes a reflective micro-mirror panel, a projecting device and a prism set. Before reaching the reflective micro-mirror panel, the light ray is firstly reflected by the prism set. The light ray reflected by the reflective micro-mirror panel in the light-state mode directly passes through the prism set and is then received by the projection lens. The light ray reflected by the reflective micro-mirror panel in the dark-state mode is totally reflected at an interface between a prism adjacent to the reflective micro-mirror panel and an air gap adjacent to the prism.

The present invention relates to the technical field of optical technology and provides a light splitting and combining device and projection optical system. The light splitting and combining device comprises a first TIR and a second TIR which is adjacent to the first TIR. One part of the adjacent surface of the first TIR and the second TIR is provided with a first optical element, the other part is provided with a second optical element, wherein the first optical element is used for splitting the incident light beam emitted to the light splitting and combining device into a beam transmitted along a first optical channel and a beam transmitted along a second optical channel, and the second optical element is used for combining the beam emitted by a first spatial light modulator and the beam emitted by a second spatial light modulator into a beam. By using the light splitting and combining device provided by the invention, the back focus of the projection system can be shortened greatly, thus the structure is more compact, and thus the volume of the projection system is reduced.

The invention provides an image capturing lens group, from an object side to an image side, which orderly comprises a first lens, a second lens, a third lens, a fourth lens and an aperture, wherein the first lens has positive refractive power, and an object side surface of the first lens is a convex surface; the second lens has negative refractive power; the third lens has the positive refractive power, and the object side surface of the third lens the concave surface while an image side surface thereof is the convex surface, and the object side surface and the image side surface of the third lens are both aspheric surfaces; the fourth lens has the negative refractive power, the image side surface of the fourth lens is the concave surface provided with at least one inflection point, and the object side surface and the image side surface of the fourth lens are both aspheric surfaces; and the aperture is located between a photographed object and the first lens. Only four of the lenses of the image capturing lens group have the refractive power. With the configuration mode of the lens group, volume of a camera lens can be reduced, sensitivity of an optical system is reduced, and higher resolving power can be obtained.

An artificial crystal double refraction plate is attached to the top of a package having a solid state imaging device chip. The artificial crystal double refraction plate protects an imaging surface and has an optical low-pass effect. An IR cut coating is applied on the surface of the artificial double refraction plate. Another two artificial crystal double refraction plates are arranged separately from the artificial crystal double refraction plate attached to the package. These three artificial crystal double refraction plates achieve desired optical low-pass effects in horizontal and vertical directions.

The invention discloses a capturing optical lens sequentially comprising a first lens, a second lens, a third lens and a fourth lens from an object side to an image side, wherein the first lens has a positive refractive power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a convex surface; the second lens has a negative refractive power, and the object side surface of the third lens is a concave surface; the third lens has a positive refractive power, the image side surface of the first lens is a convex surface, and at least one of the object side surface and the image side surface of the third lens is an aspheric surface; and the fourth lens has a negative refractive power, the object side surface of the fourth lens is a convex surface, the image side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is provided with at least one inflexion point. Only four lenses with the refractive powers are arranged in the capturing optical lens; the capturing optical lens is provided with an aperture and an electronic photosensitive device, a distance from the aperture to the electronic photosensitive device on an optical axis is SL, a distance from the object side surface of the first lens to the electronic photosensitive device on the optical axis is TTL, and the distances satisfy a relation of 0.75<SL/TTL<0.90. Through the arrangement mode of the lens group, the lens size can be effectively reduced, the sensitiveness of an optical system is reduced, and a higher resolution power can be obtained.

Provided are an image capture lens group, an image taking device and an electronic device. The image capture lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens sequentially from an object side to an image side. The first lens has a negative refractive power. The second lens has a positive refractive power. The third lens has a positive refractive power. The fourth lens has a positive refractive power. The fifth lens has a positive refractive power. The sixth lens has a negative refractive power. The number of the lenses in the image capture lens group is six. The present invention also discloses the image capturing device including the image capture lens group, and the electronic device including the image capture apparatus.

The object of the invention is to easily manufacture a shutter member without being constrained by an imaging lens and an image pickup element and to protect the imaging lens when a user does not photograph. The shutter member 14 is disposed on the side of an object of the imaging lens 25. Then, the shutter member is easily designed and manufactured, while the shutter member is not constrained by the imaging lens and the image pickup device, thereby attaining the miniaturization and thinness of the shutter member, accordingly attaining the miniaturization and thinness of the entire camera. When the camera is not used for photographing, the shutter member protects the imaging lens. In this case, arranging the shutter member as a different configuration on the side of the object of an imaging unit 13 obtained by uniting the imaging lens 25 with the image pickup device into one body makes it easy to adjust the position of the shutter member with respect to the imaging unit. This facilitates assembling work of the imaging unit and the shutter member with high accuracy, thereby improving the productivity.

The present invention includes a reflection portion which light-modulates three primary color lights by three rectangular reflective liquid crystal light bulbs, 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 bulbs are arranged in such a manner that their long side directions coincide with a perpendicular direction, and two of the three reflective light bulbs 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.

The embodiment of the invention provides electronic equipment, and belongs to the technical field of communication. The electronic equipment comprises a screen and a camera. A cover plate, an adhesivelayer, an optical filter, a packaging layer, a wiring layer and an LTPS layer which are stacked from outside to inside are arranged at the position, corresponding to the camera, of the screen; the optical filter is located in an orthographic projection area of the camera on the screen; and an opening is formed in the wiring layer and is positioned in the orthographic projection area of the cameraon the screen. In the embodiment of the invention, the optical filter is arranged in the screen, and an adhesive structure is adjusted so that on one hand, a near-focus problem of the camera caused by an adhesive bulge phenomenon in a pole screen is avoided, and on the other hand, the optical filter is arranged in the screen instead of being arranged in the camera, outward movement of the opticalfilter is realized and the back focus of a lens is shortened; and therefore, the height of the camera is reduced, and an overall thickness is decreased.