41results about How to "Image distortion is small" patented technology

The invention relates to a high-image-quality and low-distortion machine vision ultraviolet lens. The high-image-quality and low-distortion machine vision ultraviolet lens mainly comprises a front lens group, a rear lens group and a diaphragm, wherein each of the front lens group and the rear lens group has positive focal power; the diaphragm is positioned between the front lens group and the rear lens group; the front lens group is sequentially provided with a first lens, a second lens, a third lens and a fourth lens from an object space to an image space; the first lens, the second lens, the third lens and the fourth lens form a bonding lens; each of the first lens, the second lens and the third lens has negative focal power, and the four lens has the positive focal power; the rear lens group is sequentially provided with a fifth lens, a sixth lens, a seventh lens and an eighth lens from the object space to the image space; each of the fifth lens and the sixth lens has the positive focal power, and each of the seventh lens and the eighth lens has the negative focal power. With the eight spherical lenses, the high-image-quality and low-distortion machine vision ultraviolet lens has the characteristics of small F number, compact structure, low distortion, high resolution and the like, and is quite suitable for being integrated to a machine vision system.

The present invention provides a camera system having a compound array of imaging sensors disposed in a retinal configuration. The system preferably comprises a concave housing. A first imaging sensor is centrally disposed along the housing. At least one secondary imaging sensor is disposed along the housing, adjacent to the first imaging sensor. The focal axis of the second imaging sensor, in the preferred embodiment, intersects with the focal axis of the first imaging sensor within an intersection area.

The invention relates to an off-axis total reflection optical system with huge field of view, belongs to the technical field of space optics, and is used for solving the problems of the existing total reflection optical system, such as small imaging field angle and low imaging distortion. The off-axis total reflection optical system is characterized in that an aperture diaphragm is superposed to a second reflector; the system comprises a spherical reflector of which focal power the a first reflector and a third reflector is negative, the second reflector and a fourth reflector are spherical reflectors with positive optical power; the reflection surface of the first reflector is opposite to the reflection surface of the second reflector; the reflection surface of the second reflector is opposite to the reflection surface of the third reflector; the reflection surface of the third reflector is opposite to the reflection surface of the fourth reflector; and the fourth reflector is opposite to the image surface of a detector. A camera using the optical system has a huge field of view, small distortion, no shades, small stray light coefficient and high transmission function, and can also achieve multi-spectral imaging. The off-axis total reflection optical system with huge field of view is applicable to photoelectric imaging of the aeronautic and astronautic field.

An imaging lens includes, in order from an object side, a first lens G1, a second lens G2, a third lens G3, an aperture stop St and a fourth lens G4. The first lens is a negative lens having a meniscus shape with a convex surface directed to the object side. The second lens is a negative lens. The third lens is a positive lens having a convex surface directed to the object side. The fourth lens is a biconvex lens. The following conditional expression is satisfied:1.5<f4 / fa<2.7  (1)where fa denotes a focal length of the whole lens system, and f4 denotes a focal length of the fourth lens.

The invention relates to the field of space optics technology, and specifically discloses a ring band free-form surface optical element and a monolithic optical system. The ring band free-form surfaceoptical element of the invention adopts a lens form and includes a first surface and a second surface. Light is transmitted from a transmission band of on the first surface into the optical element,is emergent on a transmission band of the second surface after four reflections inside the optical element, and arrives at an image surface of a detector to complete imaging. Ring band surface forms of the first surface and the second surface of the optical element are subjected respectively to high-precision fitting with low-order XY polynomials, the ring band free-form surface forms can be ensured to realize integrated machining detection, the structure is simple and the processing difficulty is reduced. In the invention, the monolithic ring band free-form surface optical element is used toform the monolithic optical system, the off-axis field of view aberration and color aberration of the system are corrected, and an extremely miniaturized and lightweight system is realized.

The present invention provides a camera system having a compound array of imaging sensors disposed in a retinal configuration. The system comprises a concave housing. A first imaging sensor is centrally disposed along the housing. A second imaging sensor is disposed along the housing, adjacent to the first imaging sensor. The focal axis of the second imaging sensor intersects with the focal axis of the first imaging sensor within an intersection area. A third imaging sensor is disposed along the housing, adjacent to the first imaging sensor opposite the second imaging sensor. The third imaging sensor has a focal axis that intersects with the focal axis of the first imaging sensor within the intersection area.

The invention discloses an optical imaging lens and imaging equipment. The optical imaging lens sequentially comprises a first group with negative focal power, a second group with positive focal power and a third group with focal power from an object side to an imaging surface along an optical axis, the first group sequentially comprises a first lens with negative focal power and a second lens with negative focal power from the object side to the imaging surface along the optical axis; the second group sequentially comprises a third lens with positive focal power, a fourth lens with positive focal power and a fifth lens with negative focal power from the object side to the imaging surface along the optical axis, and the fourth lens and the fifth lens form a balsaming lens; and the third group sequentially comprises a sixth lens with focal power from the object side to the imaging surface along the optical axis. The optical imaging lens has the advantages of large aperture, long focal length and small aperture, can provide a high-definition imaging effect, and can improve the imaging quality and recognition accuracy of a long-distance target.

The invention relates to a large-field-of-view small-F-number ultrahigh-resolution ultraviolet spectral imager and belongs to the technical field of imaging. The large-field-of-view small-F-number ultrahigh-resolution ultraviolet spectral imager is sequentially provided with a first crescent lens, a second crescent lens, a first biconcave lens, an aperture diaphragm, a first biconvex lens, a second biconvex lens, a biconcave lens, a third biconvex lens and a third crescent lens, wherein all lenses are disposed on the same optical axis; the first crescent lens, the second crescent lens and the first biconcave lens form a front lens group to realize primary imaging, and a convergence surface is located on the aperture diaphragm; the first biconvex lens, the second biconvex lens, the second biconcave lens, the third biconvex lens and the third crescent lens form a rear lens group to perform secondary imaging to a converged ray surface of the aperture diaphragm, and an image is located on an image surface. The large-field-of-view small-F-number ultrahigh-resolution ultraviolet spectral imager has the advantages that the components are simple and easy to manufacture, the system is small in size, the tolerance is good, the assembling is facilitated, the imaging quality is excellent, the all-field-of-view full-waveband modulation transfer function value at Nyquist frequency of 1001p / mm is superior to 0.48, and the imaging distortion is lower than 0.5 percent.

The invention provides a rearview mirror capable of avoiding an automobile blind area. A blind area mirror with the same size as a rearview plane mirror is stuck to the back face of the rearview plane mirror. When an automobile steers, a rearview mirror overturning mechanism automatically turns the blind area mirror to the front face and turns the rearview plane mirror to the back face. When the automobile returns to normal driving, the rearview mirror overturning mechanism automatically turns the blind area mirror to the back face and turns the rearview plane mirror to the front face. The rearview mirror has the advantages that compared with existing solutions, the mirror surface of the blind area mirror is larger, so that the visual area is larger, the image distortion is small, and the blind area problem can be better solved. Meanwhile, when the automobile does not steer, and a driver needs to check the blind area condition, the blind area mirror can also be turned over manually and the direction is adjusted through an operating button on a steering wheel or a driving cab.

The invention discloses a phased array overall situation focusing system and a focusing method thereof. The phased array overall situation focusing system can transmit on a single energy converter unit by turns and all the energy converter units receive and focus transmission and receiving synthesis on echo line scanning signals of a plurality of sampling points of a space, so that the space imaging quality can be greatly improved. The phased array overall situation focusing system comprises an energy converter unit, a signal processing unit, a dynamic delay overall situation focusing compensation module and a signal overlapping module; the phased array overall situation focusing system can be used for transmitting the phased array and focusing the transmission and receiving synthesis on any one space point on a synthesis line behind a space initial focusing point; in an ultrasonic phased array control nondestructive testing application, the echo line scanning signals reflected by a pre-set sampling point with small imaging distortion and high image quality can be obtained; all depth focusing compensation requirements can also be met under refraction conditions. A traditional phased array technology can also be improved and distortion caused by the fact that defect depths are not in focusing depths is reduced; the total graph focusing effect of imaging an object to be detected can be realized.

The invention discloses a device and a method for detecting defects of a large-diameter plane mirror based on line scanning and ring belt splicing. The device comprises a line scanning detector, an annular illumination light source, a measured plane mirror, a rotary table around the Z-axis, a translation table along the X-axis and a computer. By translating and rotating the measured plane mirror,the surface of the whole measured plane mirror can be detected by the scanning detector; the defect condition of the whole measured plane mirror is obtained through an ring belt splicing method; and the line scanning and the ring belt splicing reduces the imaging distortion, the intermediate data volume, and the correction difficulty and the splicing difficulty of distortions, thereby improving the detection speed and the detection quality.

The invention relates to a high-image-quality and low-distortion machine vision ultraviolet lens. The high-image-quality and low-distortion machine vision ultraviolet lens mainly comprises a front lens group, a rear lens group and a diaphragm, wherein each of the front lens group and the rear lens group has positive focal power; the diaphragm is positioned between the front lens group and the rear lens group; the front lens group is sequentially provided with a first lens, a second lens, a third lens and a fourth lens from an object space to an image space; the first lens, the second lens, the third lens and the fourth lens form a bonding lens; each of the first lens, the second lens and the third lens has negative focal power, and the four lens has the positive focal power; the rear lens group is sequentially provided with a fifth lens, a sixth lens, a seventh lens and an eighth lens from the object space to the image space; each of the fifth lens and the sixth lens has the positive focal power, and each of the seventh lens and the eighth lens has the negative focal power. With the eight spherical lenses, the high-image-quality and low-distortion machine vision ultraviolet lens has the characteristics of small F number, compact structure, low distortion, high resolution and the like, and is quite suitable for being integrated to a machine vision system.

The invention discloses a free-form surface imaging optical system. The free-form surface imaging optical system comprises a first reflector, a second reflector, a third reflector, a fourth reflector, an aperture diaphragm and a detector. A target is irradiated on the second reflector after being reflected by the first reflector, is irradiated on the third reflector after being reflected by the second reflector, is irradiated on the fourth reflector after being reflected by the third reflector, and finally is irradiated on the image plane of the detector after being reflected by the fourth reflector. The aperture diaphragm coincides with the third reflector in position. The first reflector is a long-strip-shaped spherical reflector of which the focal power is negative. The second reflector is a free-form surface reflector of which the focal power is positive. The third reflector is a free-form surface reflector of which the focal power is negative. The fourth reflector is a free-form surface reflector of which the focal power is positive. A camera with the free-form surface imaging optical system adopted is huge in view field and small in distortion, and can achieve multi-spectrum imaging. The free-form surface imaging optical system can be applied to the field of aeronautics and astronautics photo-electronic imaging.

An optical lens (45), a camera module (40) and electronic equipment (100). The optical lens (45) comprises a first lens (451), a second lens (452), a third lens (453), a fourth lens (454), a fifth lens (455) and Sixth lens (456). The first lens (451), the third lens (453) and the fifth lens (455) all have positive refractive power, the second lens (452) and the fourth lens (454) all have negative refractive power, and the sixth lens ( 456) has positive or negative power. The object side and the image side of the first lens (451) to the sixth lens (456) include at least one non-rotationally symmetrical aspherical surface. The optical lens (45) is applied to the camera module (40) and the electronic device (100), and the camera module (40) and the electronic device (100) can achieve ultra-wide-angle shooting while solving the problem of ultra-wide-angle shooting to a greater extent. Distortion problems in imaging.

The invention discloses a defect detection device and method for a large-diameter plane mirror based on line scanning and ring belt splicing. platform, computer. By translating and rotating the measured plane mirror, the entire surface of the measured plane mirror can be detected by the scanning detector, and the defect situation of the whole measured plane mirror is obtained through the ring band splicing method. Among them, the method of line scanning and ring-band splicing reduces imaging distortion, the amount of intermediate data, the difficulty of distortion correction and splicing, and improves the detection speed and detection quality.

The invention discloses a high-resolution high-value hole diameter imaging spectrometer for plant weak fluorescence passive detection. The imaging spectrometer is sequentially provided with a slit, afirst lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a plane transmission grating, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens and an image surface, wherein the first to sixth lenses form a collimation lens group; the eighth to thirteenth lenses form a focusing lens group. The hole diameter grating is positioned onthe plane lens grating; the collimation lens group projects slit emergent light onto the plane transmission grating; the plane transmission grating performs chromatic dispersion on the collimation light; a continuous chromatic dispersion spectrum is formed through the focusing lens group and is imaged on the image surface. The optical system has high value hole diameter and high resolution; the forming elements are simple; the processing and the manufacturing are easy; the assembly is easy; the imaging quality is excellent; the whole view field whole wave band mean square root point range figure is realized; the radius value is smaller than 6.5 mum; the imaging aberration is lower than 0.5 percent.

The invention relates to an off-axis total reflection optical system with huge field of view, belongs to the technical field of space optics, and is used for solving the problems of the existing total reflection optical system, such as small imaging field angle and low imaging distortion. The off-axis total reflection optical system is characterized in that an aperture diaphragm is superposed to a second reflector; the system comprises a spherical reflector of which focal power the a first reflector and a third reflector is negative, the second reflector and a fourth reflector are spherical reflectors with positive optical power; the reflection surface of the first reflector is opposite to the reflection surface of the second reflector; the reflection surface of the second reflector is opposite to the reflection surface of the third reflector; the reflection surface of the third reflector is opposite to the reflection surface of the fourth reflector; and the fourth reflector is opposite to the image surface of a detector. A camera using the optical system has a huge field of view, small distortion, no shades, small stray light coefficient and high transmission function, and can also achieve multi-spectral imaging. The off-axis total reflection optical system with huge field of view is applicable to photoelectric imaging of the aeronautic and astronautic field.

The invention discloses an optical imaging lens and an imaging device. The optical imaging lens includes sequentially from the object side to the imaging surface along the optical axis: a first group with negative refractive power, a second group with positive refractive power, A third group with optical power; the first group includes sequentially from the object side to the imaging plane along the optical axis: a first lens with negative power, a second lens with negative power; the second group From the object side to the imaging surface along the optical axis, it includes: a third lens with positive refractive power, a fourth lens with positive refractive power, and a fifth lens with negative refractive power, and the fourth lens and the fifth lens are cemented together a lens; the third group sequentially includes along the optical axis from the object side to the imaging plane: a sixth lens having optical power. The optical imaging lens has the advantages of large aperture, long focal length and small aperture, and can provide high-definition imaging effects at the same time, and can improve the imaging quality and recognition accuracy of distant targets.