45results about How to "Reduce field curvature" patented technology

The invention discloses a novel laser confocal microscopic endoscope with high resolution, a telescopic image transmission system is used for replacing optical fiber bundles or a single optical fiber, the laser is coupled into a tissue in vivo, a reflected light or a fluorescent signal is coupled into a detector in vitro, a fluorescent image with high resolution and contrast is obtained, meanwhile an endoscope probe diameter is reduced; a confocal scanning mechanism is arranged in vitro, the high performance confocal scanning is obtained, meanwhile the dimension of the endoscope probe can not be increased, and the confocal scanning mechanism is compatible with an existing hard tube endoscope, thereby implementing the high-performance histopathology diagnosis in vivo.

The invention provides a photographic optical system. The photographic optical system sequentially comprises a first lens (focal length being f1), a second lens (focal length being f2), a third lens (focal length being f3), a fourth lens (focal length being f4), a fifth lens (focal length being f5), a sixth lens (focal length being f6) and a seventh lens (focal length being f7) which are coaxially arranged from an object side to an image side, wherein the first lens has negative focal power and an object side surface being a convex surface; and the seventh lens has negative focal power, and satisfies the following conditions: -1.5<f1/f<-0.5, 1.0<f2/f<2.5, 0.5<f3/f<1.5 , -2.5<f4/f<-0.5, -10<f5/f<-2, 0.2<f6/f<1.2, -2.5<f7/f<-0.4, wherein f is the focal length of the entire system. The photographic optical system with large relative aperture provided by the invention is designed through reasonable surface form optimization, focal power allocation and optical material selection, can provide imaging performance in a low illumination environment, and is clear in imaging.

An inspection apparatus includes an illumination system that receives a first beam and produces second and third beams from the first beam and a catadioptric objective that directs the second beam to reflect from a wafer. A first sensor detects a first image created by the reflected second beam. A refractive objective directs the third beam to reflect from the wafer, and a second sensor detects a second image created by the reflected third beam. The first and second images can be used for CD measurements. The second beam can have a spectral range from about 200 nm to about 425 nm, and the third beam can have a spectral range from about 425 nm to about 850 nm. A third sensor may be provide that detects a third image created by the third beam reflected from the wafer. The third image can be used for OV measurements.

The invention discloses an eyepiece system and a head-mounted display device. The eyepiece system a spherical display screen and a Fresnel lens which are sequentially arranged along the incident direction of light; the center line of the spherical display screen is overlapped with a horizontal line where the optical axis of the Fresnel lens is located; the spherical display screen protrudes towards the Fresnel lens; and the Fresnel lens is provided with a first surface protruding towards a light path diaphragm and a second surface protruding towards the spherical display screen. According to the eyepiece system provided by the technical schemes of the invention, a Fresnel lens and spherical display screen-combined technical means is adopted; the surface shapes of the Fresnel lens are reasonably set, so that the focal power of the eyepiece system can be shared, and the astigmatism of the system can be reduced; and the spherical display screen is set reasonably, so that the curvature of field of the system can be decreased, and edge imaging quality can be improved.

The invention discloses an optical module and a head-mounted display device, the optical module comprises a display, a cemented lens, a light splitting member, a quarter-wave plate and a polarization reflection film, wherein the display emits light for imaging display; the cemented lens is arranged in the light emitting direction of the display and comprises a first lens and a second lens, the first lens and the second lens are sequentially arranged in the propagation direction of a light path, the second surface of the first lens and the third surface of the second lens are arranged in a cemented mode, and the third surface protrudes towards the direction of the display. The fourth surface of the second lens protrudes towards the direction away from the display; the light splitting member is arranged on the first surface of the first lens; the quarter-wave plate is arranged between the first lens and the second lens; the polarization reflection film is arranged between the quarter-wave plate and the second lens. According to the technical scheme, the total optical length of the optical system can be reduced, the size of the head-mounted display device is reduced, and a user can wear the head-mounted display device conveniently.

The invention provides a long-focus type panoramic annular imaging lens. The long-focus type panoramic annular imaging lens is totally composed of eleven spherical lenses, and comprises a panoramic annular lens assembly and a transferring lens assembly. The panoramic annular lens assembly comprises a first lens, a second lens and a third lens coaxial and arranged sequentially from an object space to an image space, and is of a triplet panoramic annular lens structure. The transferring lens assembly is composed of eight lens including a negative meniscus lens, a positive lens and two doublets. The long-focus type panoramic annular imaging lens satisfies f-theta object-image relation, and has the advantages of high resolution, super large field of view (360 degrees in the horizontal direction and 60 degrees in the vertical direction), high imaging quality and the like; adopted glass is ordinary optical glass excluding special glass and calcium fluoride; the lens structure is good in manufacturability to the benefit of processing and reduction of cost.

The invention provides an internal reflection type catadioptric panoramic imaging lens. The internal reflection type catadioptric panoramic imaging lens comprises a catadioptric mirror group and a relay mirror group which are arranged in sequence. The catadioptric mirror group includes a first catadioptric lens and a second catadioptric lens which are arranged coaxially and arranged sequentially along a direction from the catadioptric mirror group to the relay mirror group, and the first catadioptric lens and the second catadioptric lens are connected by a connecting surface. Full-view ultra-wide-angle imaging is realized. An appropriate angle magnification is provided to expand the field of view. The catadioptric mirror group is a lens group, and can bear greater vertical field of view and relative aperture. The field of view and the aperture of the lens are large. The long after-work distance ensures the installation space of other parts. Moreover, the lens has the effects of compact structure, small size, and easy installation.

The invention discloses a five-lens type image lens and an electronic device applying the same. The image lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens made of plastic material from an object side to an image side. The first lens has a positive reflective index and a convex surface located at the object side; the second lens has a negative reflective index and a concave surface located at the image side; the third lens is a biconvex lens; the fourth lens is a meniscus lens and has a convex surface located at the image side; and the fifth lens is provided with a concave surface which is located at the image side and is adjacent to the region of an optical axis. The lens is made of the plastic material, therefore, the requirements for light weight and low manufacturing cost can be met; and due to the design of the five-lens type image lens, the luminous flux can be increased, the signal to noise ratio and the light absorption angle can be increased, and the field angle can be amplified, therefore, the five-lens type image lens can maintain high optical quality and meet the practical requirement.

The invention relates to a catadioptric eyepiece optical system and a head-mounted display device. The system comprises an optical polaroid, a first phase retardation film, a first lens group, a second lens group, a third lens group, a second phase retardation film and a linear polaroid which are sequentially arranged from a human eye observation side to a micro image display along an optical axisdirection, each of the first lens group, the second lens group and the third lens group comprises one or more lenses; a unique semi-transparent and semi-reflective optical surface is arranged betweenthe first phase retardation film and the second phase retardation film; the semi-transparent and semi-reflective optical surface is arranged on one optical surface of the first lens group, the secondlens group or the third lens group; the first lens group and the third lens group are positive focal power lens groups; the second lens group is a negative focal power lens group; the system realizesoptical indexes such as large field angle, low distortion, low chromatic aberration, low field curvature, low astigmatism and the like, and is compact in size, light in weight and convenient to wearon the head.

The invention relates to a large-field-angle eyepiece optical system and a head-mounted display device, and the system comprises a first lens group, a second lens group and a third lens group, which are coaxially and sequentially arranged from a human eye observation side to a miniature display side in the direction of an optical axis. The optical focal lengths of the first lens group, the second lens group and the third lens group are positive, negative and positive combinations; the first lens group is composed of two optical lenses, namely a first lens close to the human eye side and a second lens far away from the human eye side; the first lens group comprises at least two Fresnel optical surfaces; the first lens comprises at least one Fresnel optical surface; the second lens group comprises a third lens and a fourth lens which are adjacent to the first lens group and are sequentially arranged along the optical axis; the third lens and the fourth lens are negative lenses; the third lens group is composed of an optical lens; the third lens group comprises a fifth lens; the fifth lens is a positive lens; and the large-field-angle eyepiece optical system has the advantages of large field angle, high image quality, low distortion, small field curvature, small size and the like.

The invention relates to a large-field-angle eyepiece optical system and a head-mounted display device, and the system comprises a first lens group, a second lens group and a third lens group, which are coaxially and sequentially arranged from a human eye observation side to a miniature image display side in the direction of an optical axis. The effective focal lengths of the first lens group, the second lens group and the third lens group are positive, negative and positive combinations; the first lens group comprises a first lens close to the human eye side and a second lens far away from the human eye side; the first lens group comprises at least two Fresnel optical surfaces; the first lens comprises at least one Fresnel optical surface; the second lens group comprises third lenses which are adjacent to the first lens group and are sequentially arranged along the optical axis; the third lens is a negative lens; the third lens group comprises a fourth lens and a fifth lens which are adjacent to the second lens group and are sequentially arranged along the optical axis; the fourth lens is a positive lens; the fifth lens is a negative lens; and the system can realize the indexes of large field angle, high image quality, low distortion, small field curvature, small volume and the like.

The invention discloses an ultra-wide-angle lens and imaging equipment, and the ultra-wide-angle lens sequentially comprises,from an object side to an imaging surface along an optical axis, a first lens with negative focal power, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; a second lens with negative focal power, wherein the object side surface and the image side surface of the second lens are concave surfaces; a third lens with positive focal power, wherein the object side surface and the image side surface of the third lens are convex surfaces; a fourth lens with positive focal power, wherein the object side surface and the image side surface of the fourth lens are convex surfaces; a diaphragm; a fifth lens with positive focal power, wherein the object side surface and the image side surface of the fifth lens are convex surfaces; a sixth lens with negative focal power, wherein the object side surface and the image side surface of the sixth lens are concave surfaces, and the fifth lens and the sixth lens form a bonding body; and a seventh lens with positive focal power, wherein the object side surface and the image side surface of the seventh lens are convex surfaces near the axis. The ultra-wide-angle lens has the advantages of ultra wide angle, small temperature drift, low chromatic aberration and high resolution.

The invention provides a catadioptric ultra-wide-angle imaging system comprising a camera system, a circuit system, and a mechanical system. The camera system, the circuit system, and the mechanical system are connected mutually. The camera system consists of a catadioptric lens group, a relay lens group and an image surface; the relay lens group and the catadioptric lens group are arranged coaxially; and a catadioptric first lens and a catadioptric second lens are connected by a connecting surface. With the system, ultra-wide-angle view finding can be realized. Because the catadioptric lens group employs the lens group, bearing of the large vertical view field and the large relative aperture can be realized. Moreover, the system with a compact structure can be installed conveniently.

The invention relates to an imaging lens which comprises a first lens group (G1) with positive focal power, a diaphragm, a second lens group (G2) with positive focal power and a third lens group (G3)with positive focal power or negative focal power which are sequentially arranged from an object side to an image side, and the third lens group (G3) is a fixed group. The first lens group (G1) and the second lens group (G2) form a focusing group capable of moving along an optical axis. The imaging lens is arranged according to the limitations, and can realize the characteristics of large aperture, high resolution, low distortion, uniform image quality, large depth of field, good color rendition degree and high contrast ratio.

The invention relates to a field of an optical lens and discloses a shooting optical lens. The shooting optical lens comprises an aperture, a first lens having positive refraction power, a second lens having negative refraction power, a third lens having positive refraction power, a fourth lens having negative refraction power and a fifth lens having negative refraction power, wherein the shooting optical lens further satisfies expressions as follows, 0.45<f1/f<0.55, 0.85<f2/f< 0.75, 2.0<f3/f<2.3, 3.4<f4/f< 3, 1.3<f5/f< 1.1 and 0.2<f2/f4<0.3 . The shooting optical lens is advantaged in that design demands of low TTL and large aperture can be satisfied, and excellent sensitivity is realized.

The invention relates to an imaging lens which comprises a first lens group (G1) with positive focal power, a diaphragm (STOP) and a second lens group (G2) with positive focal power which are sequentially arranged from an object side to an image side, the first lens group (G1) is a fixed group, and the second lens group (G2) is a focusing lens group capable of moving along an optical axis; the first lens group (G1) comprises at least three positive focal power lenses and two negative focal power lenses. The imaging lens provided by the invention can realize the characteristics of large aperture, high resolution, low distortion, uniform image quality, wide working object distance range, good color rendition degree and high contrast ratio.

The invention discloses a photosensitive chip assembly, and a camera module and a mobile terminal using the photosensitive chip assembly. The photosensitive chip assembly comprises a photosensitive chip which is provided with a photosensitive area and a non-photosensitive area located at the edge of the photosensitive area, wherein the photosensitive area receives light reaching the front face of the photosensitive chip; a stress film which is attached to the back face of the photosensitive chip and has a preset thickness, wherein the stress generated in the stress film enables the photosensitive area of the photosensitive chip to deform towards the back face of the photosensitive chip. According to the photosensitive chip disclosed by the invention, the stress film is plated on the back surface of the photosensitive chip, and the stress generated by the stress film enables the photosensitive chip to deform towards the back surface of the photosensitive chip, so that the condition that the central area or the photosensitive area of the photosensitive chip protrudes towards the front surface of the photosensitive chip after the heating and curing process of the camera module is counteracted or reduced; and the phenomenon of poor photographing quality caused by field curvature is reduced. The invention also utilizes the photosensitive chip assembly to manufacture a camera module.