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

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.

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 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 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 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.