130 results about "Half field" patented technology

A three-group zoom lens includes, in order from the object side, first, second and third lens groups having negative, positive and positive refractive power, respectively. During zooming from the wide-angle end to the telephoto end, the second lens group moves monotonically toward the object side while moving closer to the first lens group and farther from the third lens group, and the first and third lens groups reverse directions to define curved paths. The third lens group is closer to the object side at the wide-angle end and moves toward the object side for close focusing. The focal lengths of the zoom lens and its lens groups, the zoom ratio, the length of the zoom lens, and the half-field angle at the wide-angle end satisfy certain conditions in order to achieve a zoom ratio of at least three with favorable correction of aberrations.

A method, apparatus, and computer-readable media comprising generating a positioning signal comprising a first half-field and a second half-field; and transmitting the positioning signal; wherein each of the first and second half-fields comprises 313 segments; and wherein each of the segments comprises 832 chips comprising an American Television Standards Committee (ATSC) digital television (DTV) segment synchronization signal and a pseudonoise sequence.

A three-group zoom lens includes, in order from the object side, first, second and third lens groups having negative, positive and positive refractive power, respectively. During zooming from the wide-angle end to the telephoto end, the second lens group moves monotonically toward the object side while moving closer to the first lens group and farther from the third lens group, and the first and third lens groups reverse directions to define curved paths. The third lens group is closer to the object side at the wide-angle end and moves toward the object side for close focusing. The focal lengths of the zoom lens and its lens groups, the zoom ratio, the length of the zoom lens, and the half-field angle at the wide-angle end satisfy certain conditions in order to achieve a zoom ratio of at least three with favorable correction of aberrations.

The invention discloses an optical imaging lens. The optical imaging lens comprises a first lens with focal power, a second lens with focal power, a third lens with focal power, a fourth lens with focal power, a fifth lens with focal power, a sixth lens with focal power, a seventh lens with focal power and an eighth lens with focal power from the object side to the image side along an optical axisin sequence. The object side face of the first lens is a convex face, and the image side face of the first lens is a concave face. The object side face of the second lens is a convex face, and the image side face of the second lens is a concave face. The object side face of the eighth lens is a concave face. The maximum half-field angle Semi-FOV of the optical imaging lens and the effective focallength f8 of the eighth lens meet the formula: 2.4 millimeters<=tan(Semi-FOV)*|f8|<3.5 millimeters.

The present invention discloses an optical imaging lens. The optical imaging lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens which are sequentially distributed along an optical axis from an object side to an image side; the first lens has positive focal power, the object side surface and image side surface of the first lens are convex surfaces; the second lens has negative focal power; the third lens has negative focal power, and the image side surface of the third lens is a concave surface; and the fourth lens has focal power; the fifth lens has focal power, and the image side surface of the fifth lens is a convex surface; and the sixth lens has focal power, and the object side surface of the sixth lens is a concave surface. The maximum half field of view (HFOV) of the optical imaging lens is smaller than 30 degrees.

The invention provides a wide-angle lens. Manufacturing simplicity is ensured and improvement of optical properties is achieved through a low component number. The wide-angle lens comprises a negative lens group with one or two positive lenses, a positive glass lens and a positive connection lens formed by a positive resin lens and a negative resin lens through connection from an object side in order. The wide-angle lens is a wide-angle lens with a half field angle of more than 30 degrees. The connection surface of the connection lens is designed to be an aspheric surface with a decreasing sagging amount from the optical axis to the rim when the surface is compared with a paraxial spherical surface defined by paraxial curvature radius of the connection surface.

The invention discloses an optical imaging lens. The optical imaging lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, wherein thefirst lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are sequentially arranged from the object side to the image side along the optical axis; the first lens and the fifth lens are provided with positive focal power, and the image side surface of the first lens is a concave surface; the second lens, the third lens, the fourth lens, the sixth lens and the seventh lens are provided with focal power, and the image side surfaces of the second lens and the sixth lens are concave surfaces; the object side surface of the sixth lens is a convex surface; and the object side surface of the seventh lens is a concave surface. According to the optical imaging lens, the maximum half-field-of-view angle HFOV of the optical imaging lens and thetotal effective focal length f of the optical imaging lens satisfy tan (HFOV)* f >= 4.34 mm.

A single focus wide-angle lens includes, in order from the object side: a first lens component of positive refractive power, having a meniscus shape, and having a convex object-side surface; a stop; a second lens component of positive refractive power, having a meniscus shape, having at least one aspheric surface, having a concave object-side surface, and being made of plastic; and a third lens component of negative refractive power, having a meniscus or plano-concave or biconcave shape, having both surfaces of aspheric shape, having an image-side surface that is concave on the optical axis, and being made of plastic. The single focus wide-angle lens may include only three lens elements. Specified on-axis conditions are satisfied in order to reduce aberrations and to make the single focus wide-angle lens compact. Additionally, satisfying a condition related to the half-field angle at the maximum image height helps reduce aberrations.

A single focus wide-angle lens includes, in order from the object side: a first lens component of positive refractive power, having a meniscus shape, and having a convex object-side surface; a stop; a second lens component of positive refractive power, having a meniscus shape, having at least one aspheric surface, having a concave object-side surface, and being made of plastic; and a third lens component of negative refractive power, having a meniscus or plano-concave or biconcave shape, having both surfaces of aspheric shape, having an image-side surface that is concave on the optical axis, and being made of plastic. The single focus wide-angle lens may include only three lens elements. Specified on-axis conditions are satisfied in order to reduce aberrations and to make the single focus wide-angle lens compact. Additionally, satisfying a condition related to the half-field angle at the maximum image height helps reduce aberrations.

There is provided an imaging lens with high resolution which effectively achieves low-profileness while maintaining the wide field of view, and favorably corrects aberrations.The imaging lens comprising a first lens having negative refractive power, a second lens having positive refractive power, a third lens, a fourth lens having positive refractive power, a fifth lens having negative refractive power as a double-sided aspheric lens, and a sixth lens as a double-sided aspheric lens, wherein the first lens has a concave surface facing the image side, and the aspheric surface on the image side of the sixth lens is formed as a concave surface near the optical axis and has at least one pole point at an off-axial point, and a below conditional expression (1) is satisfied:ω≥45°  (1)whereω: a half field of view.

The invention provides an eyepiece. The eyepiece is successively provided with a first lens with positive focal power and a convex object side and a second lens along the optical axis from the object side to the image side. The second lens has a concave image side. At least one of the object side of the first lens, the image side of the first lens, the object side of the second lens and the image side of the second lens is a Fresnel structure plane. The maximum half field angle HFOV of the eyepiece is greater than 40 degrees. According to the on-axis distance TTL from the object side of the first lens to an imaging face and the total effective focal length f of the eyepiece, 1<TTL / f<1.5. According to the total effective focal length f of the eyepiece and the on-axis distance TD from the object side of the first lens to the image side of the second lens, 2<f / TD<5. According to the effective radius DT11 of the object side of the first lens and the effective radius DT21 of the object side of the second lens, 2.7<DT11 / DT21<1.

A single focus wide-angle lens includes, in order from the object side: a first lens component of positive refractive power, having a meniscus shape, and having a convex object-side surface; a stop; a second lens component of positive refractive power, having a meniscus shape, having at least one aspheric surface, having a concave object-side surface, and being made of plastic; and a third lens component of negative refractive power, having a meniscus shape, having both surfaces of aspheric shape, having an image-side surface that is concave on the optical axis, and being made of plastic. The single focus wide-angle lens may include only three lens elements. Specified on-axis conditions are satisfied in order to reduce aberrations and to make the single focus wide-angle lens compact. Additionally, satisfying a condition related to the half-field angle at the maximum image height helps reduce aberrations.

The invention discloses an optical imaging lens which sequentially comprises a first lens having positive focal power, a second lens having focal power, a third lens having focal power, a fourth lenshaving focal power, a fifth lens having focal power, a sixth lens having focal power, and a seventh lens having negative focal power from the object side to the image side along the optical axis, andthe image side surface of the fifth lens is a concave surface; the effective focal length f of the optical imaging lens and the maximum half-field angle HFOV of the optical imaging lens satisfy 5.5 mm< tan (HFOV) * f < 6.5 mm. The optical imaging lens has at least one beneficial effect of large image surface, large wide angle, large aperture, ultrathin property and the like.

There is provided a wide angle lens system configured to obtain excellent image forming performance even in a half field angle region of 40 degrees to 50 degrees. A wide angle lens system is constituted of a first lens having a negative refractive power, a light path bending member having no refractive power, a second lens having a positive refractive power, an aperture which adjusts a light amount, a first cemented lens formed by cementing a third lens having a positive refractive power and a fourth lens having a negative refractive power, a fifth lens having a positive refractive power, and an optically equivalent member which functions as a faceplate of an optical low-pass filter and a solid state imaging element.

The invention discloses an optical imaging system. The optical imaging system sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a six lens along the optical axis from the object side to the image side, wherein the first lens has focal power, and the object side of the first lens is a convex face; the second lens has focal power; the third lens has focal power, and the image side of the third lens is a convex face; the fourth lens has focal power, the object side of the fourth lens is a convex face, and the image side of the fourth lens is a concave face; the fifth lens has positive focal power, and the object side of the fifth lens is a convex face; the sixth lens has negative focal power, and the object side of the sixth lens is a concave face. The maximum half field of view HFOV of the optical imaging system is larger than 50 degrees and smaller than 60 degrees, and the ratio of the curvature radius R7 of the fourth lens object side tothe total effective focal length f of the optical imaging system is larger than 0.4 and smaller than 1.5.

The invention discloses an optical imaging lens. The optical imaging lens comprises a first lens with positive focal power, a second lens with focal power, a third lens with focal power, a fourth lenswith focal power, a fifth lens with positive focal power and a sixth lens with negative focal power from the object side to the image side along an optical axis in sequence. The object side face of the first lens is a convex face. The object side face of the fourth lens is a convex face, and the image side face of the fourth lens is a concave face. The object side face of the sixth lens is a convex face. The distance TTL, between the object side face of the first lens of the optical imaging lens and the imaging face of the optical imaging lens, on the optical axis and a half of diagonal length ImgH of an effective pixel area on the imaging face meet the formula: TTL / ImgH<1.6; the total effective focal length f of the optical imaging lens and the maximum half-field angle Semi-FOV of the optical imaging lens meet the formula: 4.5 millimeters<f*tan(Semi-FOV)<7 millimeters.

The invention provides fast building earthquake-resisting reinforcing method and device. The fast building earthquake-resisting reinforcing device is a prefabricated part, the inner side of the prefabricated part is provided with a grout groove, and the grout groove is communicated with the outer side of the prefabricated part through more than one grout hole. The reinforcing method comprises the following steps of: removing the skin of the junction surface at the junction part between a wall of the reinforced building and the prefabricated part, and drilling anchoring holes in the wall, wherein the position of each anchoring hole is corresponding to the junction hole in the prefabricated part; installing the prefabricated part on the wall of the reinforced building through anchoring bolts, anchoring adjacent prefabricated parts, and fixedly bonding the prefabricated parts to the surface of the wall together. The technical scheme of field assembly of the prefabricated parts is adopted to reinforce the building, more than half field construction period can be shortened, the prefabricated parts can be produced in factories during school time, and enough time for ensuring production quality is guaranteed.

The invention discloses a camera lens group which sequentially comprises a first lens, a second lens, a third lens and a fourth lens along the optical axis from an object side to an image side. The first lens has positive focal power, and an object-side surface of the first lens is a convex surface; the second lens has positive focal power; the third lens has positive focal power, an object-side surface of the third lens is a concave surface, and an image-side surface of the third lens is a convex surface; the fourth lens has negative focal power. The maximum half-field-of-view angle HFOV of the camera lens group meets a conditional expression of 45 <HFOV<50 .

A zoom lens includes at least two lens groups that move for zooming. An object-side lens group is formed of a lens component having negative refractive power and a meniscus shape and a second lens component having positive refractive power and a meniscus shape, which may be in that order from the object side. Each of these lens components may be formed of a single lens element. Lens elements of the lens components satisfy certain conditions related to the half-field angle at the wide-angle end and the Abbe numbers of the lens elements. The zoom lens may include a third lens group, which may be stationary, with a middle lens group that moves nearer the object-side lens group and farther from the third lens group during zooming from the wide-angle end to the telephoto end. At least one surface of a lens component may be an aspheric surface.

The invention discloses an optical imaging lens. The optical imaging lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from an objectside to an image side along an optical axis; The first lens has focal power; the second lens has focal power; the third lens has focal power; the fourth lens has focal power; the fifth lens has focalpower; and the sixth lens has focal power. The maximum half field angle Semi-FOV of the optical imaging lens meets the condition that Semi-FOV is greater than or equal to 60 degrees; the curvature radius of the object side surface of the first lens and the curvature radius of the image side surface of the first lens satisfy -2.5 < (R1-R2) / (R1 + R2) < -1.0; and the curvature radius of the object side surface of the second lens and the curvature radius of the image side surface of the second lens satisfy 1.5 < R4 / R3 < 2.5, so that the optical imaging lens has the characteristics of large field angle, small distortion and the like.

The invention discloses a high-precision dynamic imaging simulator for a space target. The high-precision dynamic imaging simulator comprises two half-field display systems, an optical splicing system and a projection imaging system, wherein each of the half-field display systems comprises a display content generation system, a display driving system, a backlight illumination system, liquid crystal light valves and a liquid crystal light valve control system; the optical splicing system comprises a splicing lens group, a prism supporting structure and a mirror supporting structure flange; the projection imaging system comprises an object space telecentric projection lens, a lens mounting flange, a lens group fixing flange, a distance adjusting barrel and a locking device; the high-precision design of a large field of view is completed by the object space telecentric projection lens through matching of a small aperture and a short exit pupil distance, two liquid crystal light valves are fixedly arranged on splicing surfaces of the splicing lens groups, and through layout of effective display surfaces of the two liquid crystal light valves, the two liquid crystal light valves are spliced to a full field of view through the splicing lens groups; and the backlight illumination system and the liquid crystal light valves are integrally designed. According to the invention, the high-precision dynamic target simulation can be realized at a variable distance.

A single focus wide-angle lens includes, in order from the object side: a first lens component of positive refractive power, having a meniscus shape, and having a convex object-side surface; a stop; a second lens component of positive refractive power, having a meniscus shape, having at least one aspheric surface, having a concave object-side surface, and being made of plastic; and a third lens component of negative refractive power, having a meniscus shape, having both surfaces of aspheric shape, having an image-side surface that is concave on the optical axis, and being made of plastic. The single focus wide-angle lens may include only three lens elements. Specified on-axis conditions are satisfied in order to reduce aberrations and to make the single focus wide-angle lens compact. Additionally, satisfying a condition related to the half-field angle at the maximum image height helps reduce aberrations.

There is provided a wide angle lens system configured to obtain excellent image forming performance even in a half field angle region of 40 degrees to 50 degrees. A wide angle lens system is constituted of a first lens having a negative refractive power, a light path bending member having no refractive power, a second lens having a positive refractive power, an aperture which adjusts a light amount, a first cemented lens formed by cementing a third lens having a positive refractive power and a fourth lens having a negative refractive power, a fifth lens having a positive refractive power, and an optically equivalent member which functions as a faceplate of an optical low-pass filter and a solid state imaging element.

A wide-angle lens system having a long back focal length, disposed in front of a ⅓″ CCD camera and the focal length (f) for all lens groups is 3.0 mm, the F-number is 3.0 and the half-field angle is 46°. The following conditions are met by the first lens group: 1≦d / d3<1.2; R3 / R2=0.99; and d2 / f=0.03. Here, (d) indicates the thickness of the second lens along the normal line at a given distance from the optical axis within the maximum effective diameter of the object side convex surface of the lens. d3 is the thickness of the second lens along the optical axis.

The application relates to an imaging lens. The imaging lens has a maximum half field angle HFOV and a total effective focal length f, the imaging lens comprises a first lens and a plurality of subsequent lenses arranged in sequence from the object side to the image side along the optical axis, the first lens has a positive focal power, the object side surface of the first lens is a convex surface, the maximum half field angle HFOV is less than or equal to 20 degrees, and the relation between the effective focal length f1 of the first lens and the total effective focal length f satisfies the following formula: 0.5<=f1 / f<=1.5.

The invention discloses an optical lens and imaging equipment. The optical lens sequentially comprises a first lens, a diaphragm, a second lens, a third lens and a fourth lens from an object side to an imaging surface along an optical axis. The first lens has negative focal power, the object side surface is a convex surface, and the image side surface is a concave surface; the second lens has positive focal power, and the object side surface and the image side surface of the second lens are convex surfaces; the third lens has positive focal power, and the object side surface and the image side surface of the third lens are convex surfaces; the fourth lens with negative refractive power has an object-side surface being convex in a paraxial region and having at least one inflection point, and an image-side surface being concave in a paraxial region and having at least one inflection point. The four lenses are all plastic aspheric lenses. The optical lens satisfies the conditional expression: 0.5 mm<DM1 / tan(HFOV)<0.7 mm; HFOV represents the maximum half field angle of the optical lens, and DM1 represents the effective half aperture of the first lens. The optical lens at least has the advantages of being small in size, wide in view field and high in pixel.

The invention provides a design method of a star sensor lens hood and a star sensor. The design method comprises the following steps: determining a ground gas light suppression angle of the star sensor, imaging parallel lights of different incident angles which are larger than a half-field angle of a lens by a star sensor lens, analyzing an imaging gray value to obtain a lens stray light suppression angle of the star sensor lens, obtaining the half-field angle of the lens hood based on an actual image detector parameter, the lens stray light suppression angle and the ground gas light suppression angle, and obtaining the length and a clear aperture of a light-receiving end of the lens hood based on the clear aperture of the star sensor lens, the half-field angle of the lens hood and the ground gas light suppression angle. By adopting the design method provided by the invention, the problem that star point extraction is affected by the highlight of partial imaging area of a star sensor image detector due to the unreasonable design of the lens hood is effectively solved, and a sufficient basis is provided for the field angle design of the star sensor lens hood.

The purpose of the present invention is to sufficiently correct chromatic aberration of magnification through a common optical element in the later stage while aligning the direction of an image of all fields of view. A wide angle optical system (3) comprises a first group (6) having negative and positive lenses (4, 5) with negative refractive power, a second group (7) having a reflective-refractive optical element (14), and a third group (8). The reflective-refractive optical element (14) includes a first surface (11) on the object side, having a first transmitting surface (11a) and a first reflecting surface (11b) disposed surrounding the first transmitting surface, a second surface (12) on the image side, having a second transmitting surface (12a) and a second reflecting surface (12b) disposed surrounding the second transmitting surface, and a third surface (13) that is a conical transmitting surface disposed between the first surface (11) and the second surface (12) and having an apex angle toward the object. The wide angle optical system (3) satisfies the following expression: vn > vp alpha / 2 > 90 DEG - theta k Where vn represents the Abbe number of the negative lens (4), vp represents the Abbe number of the positive lens (5), alpha represents the angle of the apex angle on the third surface (13), and theta k represents a half field angle (0 < theta k < 90 DEG) of principal ray in the minimum angle of view within the lateral field of view.