59 results about "Normal lens" patented technology

A system and method for fundus imaging wherein selective illumination of a sector of the field of view of the fundus, using off-axis illumination, provides images of acceptable clarity, resolution, and size, with significantly reduced reflections, in a compact system. By rotating illumination around the optical axis, sectors of the fundus may be selectively and sequentially illuminated. An image of the entire field of view of the fundus is obtained by combining images, e.g. two or more half images, obtained within a single shutter exposure or capture period. An illumination system using LED light sources and a rotatable occluder provides for a lightweight, handheld and portable fundus imaging system. It may take the form of a fundus camera, a fundus imaging lens module for regular camera, or an adapter which couples to the standard lens of a camera to create a low cost fundus camera.

The invention relates to a nonspherical absolute measuring system based on a multiwave front lens compensator, which comprises a phase shifting interferometer, a standard lens, a multiwave front lens compensator, an electric control adjusting device and a driver thereof, a measured nonspherical optical element, a six-dimensional adjusting frame, an electric control translation platform and a drive thereof as well as a computer control and date processing system, wherein the multiwave front lens compensator comprises a plurality of optical elements or element groups. The invention realizes error separation by a plurality of interferometry for improving the surface shape detecting precision of the nonspherical optical element and has certain flexible measuring range and larger application value.

The invention relates to a transmitted wavefront detection apparatus and method for a meniscus lens. The transmitted wavefront detection apparatus for a meniscus lens comprises an interferometer, a computed hologram, a to-be-detected meniscus lens and a spherical surface reflector, which are all connected in sequence along an optical path. The light emitting end of the interferometer is provided with a standard lens. The transmitted wavefront detection method comprises the following steps: firstly, obtaining a measurement total error W2 of the spherical surface reflector; secondly, obtaining a measurement total error W1 of the meniscus lens; and thirdly, processing data according to a first detection result W1 and a second detection result W2. The invention provides a novel, simple accurate method for measuring a transmitted wavefront of a meniscus lens. By means of the computed hologram, a holographic sheet can be in alignment with the interferometer, spherical aberration caused by the meniscus lens and the spherical surface reflector can be compensated, and then the whole detection system can achieve zero detection. The method provides simple measuring steps and provides an easy data processing means, and has remarkable engineering application values.

An image sensing apparatus capable of separately performing image processing on odd-numbered fields and even-numbered fields for each of the image data from the left lens and right lens when a 3-D (stereoscopic) compatible lens is mounted, and when a normal lens is mounted, recording image data while correlating fields and reducing redundant data. When 3-D compatible lens 1 is mounted to image sensing apparatus main body 12, the mounting of the lens is informed to the image sensing apparatus main body 12. In response, the image sensing apparatus main body 12 performs image processing separately on the left and right images for each field. For instance, the image compression mode is switched from an every-field structure to an alternate-field structure.

An object is to provide a zoom lens system having compactness of about a normal lens, small number of lens elements, a zoom ratio about 2.9, good productivity, and high optical performance. The system includes, in order from the object, a first lens group with negative power and a second lens group with positive power. Zooming is performed by varying a distance between the first lens group and the second lens group. The first lens group includes at least a negative lens and a positive lens. The second lens group includes a front lens group with positive power and a rear lens group with positive power. The front lens group includes a positive lens and a cemented lens constructed by a positive lens cemented with a negative lens. The rear lens group includes a cemented lens constructed by a negative lens cemented with a positive lens. Given conditions are satisfied.

An object is to provide a zoom lens system having compactness of about a normal lens, small number of lens elements, a zoom ratio about 2.9, good productivity, and high optical performance. The system includes, in order from the object, a first lens group with negative power and a second lens group with positive power. Zooming is performed by varying a distance between the first lens group and the second lens group. The first lens group includes at least a negative lens and a positive lens. The second lens group includes a front lens group with positive power and a rear lens group with positive power. The front lens group includes a positive lens and a cemented lens constructed by a positive lens cemented with a negative lens. The rear lens group includes a cemented lens constructed by a negative lens cemented with a positive lens. Given conditions are satisfied.

The invention discloses a device for adjusting position and angle of a light beam, wherein the device comprises a normal lens, a bifocal lens, an image sensor and a computer which are arranged in sequence along the forwards direction of the light beam. The focal points of the long focuses of the normal lens and the bifocal lens are the same focal point, the light-sensitive surface of the image sensor is located on the rear focal surface of the bifocal lens, the centre of the image sensor is located on the optical axis of a system, and the output end of the image sensor is connected with the input end of a computer. The device disclosed by the invention not only can accurately adjust the position and the angle of the light beam, but also has the advantages of simple structure and low cost.

The invention provides a space camera field curvature detection device and method, relating to the field of space optical remote sensing. The space camera field curvature detection device comprises a heavy-calibre normal lens, a space camera used for receiving parallel light of the heavy-calibre normal lens and positioned at the lower end of the heavy-calibre normal lens, an optical engine, a Z-direction micrometric displacement platform, a data processing display and synchronous control system, thirty optical probes and an X-Y-direction micrometric displacement regulating frame, a flat plate and two Z-direction regulating supports, wherein the lower surface of the optical engine is positioned at the focal plane of the heavy-calibre normal lens, the Z-direction micrometric displacement platform is connected with the optical engine, the data processing display and synchronous control system is connected with the Z-direction micrometric displacement platform, the thirty optical probes and the XY-direction micrometric displacement regulating frame are connected with the data processing display and synchronous control system, the thirty optical probes are distributed on the X-Y-direction micrometric displacement regulating frame in a manner in which three lines and ten rows are arranged, the upper surface of the flat plate is positioned on the focal plane of the space camera, the thirty optical probes are positioned at the lower end of the flat plate, and the two Z-direction regulating supports are respectively fixed at two ends of the flat plate. The space camera field curvature detection device is small in measurement and calculation errors; and according to the space camera field curvature detection device, the detection problem of field curvature of the space camera is effectively solved.

A large caliber standard lens having a first lens of a positive refractive power; a second lens of a negative refractive power; a diaphragm; a third lens of a negative refractive power; a fourth lens of a positive refractive power; and a fifth lens of a positive refractive power, wherein the lenses are arranged sequentially from an object side to an image side, and the first lens, the second lens, the third lens, and the fourth lens are meniscus lenses having concave surfaces facing the diaphragm and satisfy the following inequality,0.6≤R6R4≤1.0where R4 represents the radius of curvature of the surface of the second lens facing the image, and R6 represents the radius of curvature of the surface of the third lens facing the object.

The invention discloses an absolute inspection method for synchronous measurement of multiple spherical standard lenses. The method comprises the following steps of arranging three spherical lenses, namely A, B and C; taking the spherical surface B as a reference surface, taking the spherical surface A as a test surface, and performing primary interference measurement; using the spherical surfaceB as a reference surface, and using the spherical surface A as a test surface after rotating anticlockwise for 90 degrees around a shaft for primary interference measurement; enabling the spherical surface C to serve as a reference surface, enabling the spherical surface A to keep the position during first measurement to serve as a test surface, and carrying out primary interference measurement; taking the spherical surface C as a reference surface, taking the spherical surface B as a test surface, and performing primary interference measurement; and integrating measurement results, decomposing to obtain odd-even function items of the spherical surfaces A, B and C by utilizing odd-even function decomposition and a Fourier series frequency selection method, and obtaining respective absolutesurface shape distribution of the spherical surfaces A, B and C. The method is low in measurement frequency, simple, feasible, accurate and efficient, and measurement results can ensure information of respective surface shapes at all frequencies as much as possible.

The objective of the invention is to solve the technical problems of low precision and low resolution of an existing dynamic optical wavefront phase measurement device. The invention provides a dynamic high-resolution optical wavefront phase measuring device and a measuring method, and the device and the method can achieve the active optical testing of the surface shape of an optical element and the wave aberration of an optical system through a laser, a collimating mirror, a plane mirror, a spectroscope, an absorber, a mixed modulation grating, a detector, a computer, different F # standard lenses, and a calibration mirror. The resolution is determined by the size of a detector pixel, high-resolution optical wavefront phase measurement can be achieved, and the resolution can be smaller than 0.01 mm. According to the method, a system background error is used as system data after being calibrated once, and the measured surface topography information can be calculated only by collectingan image once during actual surface shape measurement, so that compared with the traditional phase shift interference method, the method is not influenced by environments.

The invention provides a curved-surface composite super-resolution current-carrying pipe which is characterized in that a hollow curved-surface current carrier is adopted; the curved-surface current carrier is a composite structure which is formed by at least a metal layer and a dielectric layer, the sample to be tested is arranged in the hollow chamber thereof. The curved-surface composite super-resolution current-carrying pipe leads the dielectric constants in the normal direction and tangential direction to have opposite symbols by constructing the curved-surface composite structure of metal and dielectric and leads high frequency quantity which carries fine structure information and can not be transmitted in normal lens to be transmitted in the curved-surface composite super-resolution current carrying pipe wall and not to generate mutual interference; the dot pitch is more than the Rayleigh resolution limit when the high frequency quantity is emitted out through the curved surface of the external wall of the current carrying pipe, thus realizing that the sample structure of nanometer-class exceeding the diffraction resolution limit can be observed far away; the curved-surface composite super-resolution current-carrying pipe has high resolution, avoids the error of close detection and has far imaging which is more convenient for operation and application.

The invention discloses a cystoscope with living body real-time Raman spectrum detection and a method. The method is capable of solving the problem in the prior art that the cystoscope cannot confirm a suspicious neoplasm in real time and a small focus cannot be accurately verified. The cystoscope has the effects of detecting the living body in real time, and identifying a chronic disease. The solution is as follows: the cystoscope comprises a cystoscope body. An operating channel is formed in the cystoscope body. A first pipeline and a Raman spectrum channel are installed in the operating channel. A light source channel and an endoscope channel are installed in the first pipeline, and the end part of the first pipeline is provided with a normal lens. The Raman spectrum channel is connected with a slantwise installed hose. The Raman spectrum channel is internally provided with a Raman spectrum optical fiber with a Raman spectrum analysis lens. The Raman spectrum analysis lens has the set toughness. The side wall of the cystoscope body is provided with a cold light source interface communicated with the light source channel and a Raman spectrum operation port for operating the Raman spectrum optical fiber. The end part of the cystoscope body is provided with a tail end for operating the operating channel.

In camera systems with more than one aperture plane, light from different object points can be shaded by either the lens' pupil, the system's aperture or both. depending on pupil and aperture diameters, separation and camera system field of view. In an aperture shading correction (ASC) algorithm, the shading that results from the convolution of the lens' pupil function and its aperture function is determined over the image plane for any given pupil and aperture diameter and separation. A shading correction function is then calculated, and / or its parameters are determined, that will undo the adverse relative illumination degradations that result from the tandem pupil and aperture. This can be done in separate color planes. This can be done in tandem with standard lens shading correction that must also be corrected for (i.e., the lens shading correction (LSC) can be performed in the sensor for the case of no aperture shading, then the ASC multiples the LSC during aperture shading). Aperture shading will also impact SNR and MTF, and as such the tuning of these parameters will also benefit from ASC knowledge.

The invention discloses an interference measurement method for the refractive index of a lens. The method comprises the following steps that the lens to be measured is moved, so that parallel beams emitted by an interferometer converge on the surface of the lens to be measured after passing through a normal lens; then, distance measurement and surface shape error compensation are conducted through two distance measurement interferometers, two-time locating position coordinates of the vertexes of the front surface and the back surface of the lens to be measured are obtained, and the refractive index of the lens is worked out through a ray tracing formula. Measuring equipment used in the method comprises the interferometers, the normal objective lens, a laser range finder, a five-dimensional adjusting rack and a movable guide rail. The normal objective lens and the lens to be measured are sequentially placed in the direction of emergent rays of an interferometer light source. The lens to be measured is fixed to the five-dimensional adjusting rack and can move on the guide rail. Locating and position compensation are conducted on the surfaces of the lens according to an interference method, and non-contact measurement of the refractive index of the lens is achieved.

A light and projective lens consists of a reflection body, a light source, a support body and a lens body. It is featured as setting lens body to be a focusing light transmission body made of optical plastic material with heat proof and changing to be yellow color proof property, coating a layer of inorganic oxide film on lens body for isolating infrared and ultraviolet ray, utilizing ejection process to prepare optical plastic lens body for saving grinding process used in preparing normal lens body so as to be easy to produce large amount of optical plastic lens body.

The invention discloses a wavefront detection device and method for an edge sub-mirror in a spliced mirror. An interferometer and a laser tracker are combined for use; the wavefront of the edge sub-mirror in the spliced mirror is detected by compensating aberration through a computer-generated hologram sheet; the wavefront detection device comprises a high-precision plane mirror, a lifting frame,the detected edge sub-mirror, an inclination adjustment device, the computer-generated hologram sheet, a small five-dimensional adjustment table, a standard lens, the interferometer, a vibration isolation platform, a five-dimensional adjustment table, the laser tracker and a target ball. A space coordinate system of the interferometer, the measured edge sub-mirror and the plane mirror is established by using the laser tracker; and the computer-generated hologram sheet is palced to be aligned with the interferometer, the interferometer and the computer-generated hologram sheet are taken as a whole, the pitch and inclination of the whole are finely adjusted to form an auto-collimation light path, and adjustment is carried out until an aberration item in a wavefront detection result of the interferometer is minimum, thereby obtaining the wavefront detection result of the detected edge sub-mirror.

The invention discloses a pair of intelligent glasses capable of realizing intertranslation of multiple languages. The pair of glasses comprises a spectacle frame, spectacle lenses, a computing chip,a communication chip, a display membrane, antennas, a microphone, two speakers, and a power supply, wherein two communication antennas and two speakers are respectively embedded in two legs of the spectacle frame, the microphone is installed in the lower center of the spectacle frame, the camera is installed in the upper center of the spectacle frame, and the power supply is installed on the spectacle frame, the spectacle lenses comprise four parts, namely, a normal lens, the computing chip, the communication chip and the display membrane, the computing chip is embedded in the left lens, the communication chip is embedded in the right lens, and the display membrane is attached to the inner surface of the lens. The pair of intelligent glasses uses a cloud-based architecture, so that the client device is smaller and is more portable; text read, display and voice play devices are embedded in the glasses, so that the user can obtain what he sees, and the pair of intelligent glasses is veryconvenient and practicable.

The invention discloses a twin-lens capsule endoscope and a working system thereof. The twin-lens capsule endoscope comprises an endoscope shell, wherein a working circuit board is integrated in the endoscope shell and connected with an image acquisition module; and the image acquisition module comprises a standard endoscope lens and a telephoto lens both connected with the working circuit board. A standard endoscope lens and a telephoto lens are arranged, wherein the telephoto lens can effectively capture images which cannot be shot clearly by a standard lens; when facing a wound, the telephoto lens can shoot a larger and clearer image; and moreover, by adopting a common lens and a telephoto lens to shoot the same position, specific circumstances of the wound can be obtained more comprehensively and accurately through mutual reference of the obtained images. Through the improvement of the technical scheme, the capability of a capsule endoscope in obtaining clearer and more accurate images is enhanced, and the diagnosis accuracy is improved.

The invention discloses a compact 35mm F0.95 digital camera APS picture lens. The picture lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens and an eleventh lens from an object side, wherein the first lens, the second lens, the sixth lens, the seventh lens, the ninth lens and the tenth lens are spherical surface positive lenses convex in the object side, the third lens is a spherical surface negative lens convex in the object side, the fourth lens and the eleventh lens are spherical surface negative lenses recessed in the object side, the fifth lens is a spherical surface positive lens parallel with the object side, the eighth lens is a spherical surface negative lens parallel with the object side, and a diaphragm is arranged between the third lens and the fourth lens. The compact 35mm F0.95 digital camera APS picture lens is advantaged in that the picture lens is a standard lens, an aperture is super large, exquisite appearance is realized, and cost performance is quite high.

The invention provides a focal length test device. The light beam emitted by an LED light source illuminates a reticle; a parallel tube objective lens projects the line pair on the reticle into firstparallel light; the first parallel light is incident to the measured optical lens and forms an image of the line pair; the image of the line pair is projected into second parallel light after passingthrough a standard lens; a focus lens receives the second parallel light and focuses the image of the line pair on a detector; the detector receives the image of the line pair and transmits the imageof the line pair to an external computer for processing and calculation so as to obtain the focal length of the measured optical lens. According to the focal length test device, the microscope objective lens is replaced by the standard lens and the focusing lens, and a parallel light path is formed between the two lenses so that the small distance change between the standard lens and the focusinglens has no influence on the test, the standard lens can be conveniently replaced and the requirement of a wide-range focal length test is met.