78results about How to "Small optical distortion" patented technology

The invention discloses a method for correcting distortion in real time based on a GPU camera and video camera. The method adopts digital image processing technology to calculate a system of nonlinear equations consisting of two radial distortion coefficients, two centrifugal distortion coefficients and two thin prism distortion coefficients by a least square method in a correction algorithm based on a planar grid model so as to obtain a space transformation equation, and carries out synchronous spatial alternation on pixel spots of an image shot by an imaging system so as to obtain an image after distortion correction. The method solves the problem of optical distortion, and improves the correction precision to sub-pixel grade; through adopting the GPU technology with parallel processing capability, the processing velocity is improved by over 40 times, realizing real-time distortion correction (over 30 frame/second) of an 1920*1080 high-definition image, and reducing the processing cost for lens optical design by 20 to 70 percent.

The present invention is aimed to produce a cured product having excellent photochromism which can be easily polymerized in a short period of time. The cured product is obtained by photopolymerizing a polymerizable composition comprising (A) a radical polymerizable monomer, (B) an ultraviolet polymerization initiator having the main absorption at an ultraviolet range and a molar absorption coefficient for light having a wavelength of 400 nm of 150 liter/(mol·cm) or more, (C) a thermopolymerization initiator such as a thermopolymerization initiator having a temperature at which the half-life thereof is 10 hours of 60° C. or more and (D) a photochromic compound by irradiating activation energy rays having a wavelength of 400 nm or more as the main emission spectrum, preferably to ensure that the temperature of the cured product does not exceed 50° C., and further thermopolymerizing the composition by heating.

A glass substrate for a front filter of a display device having considerable strength and excellent display quality, and being lightweight is provided. A display device employing this display filter substrate is provided. The glass substrate has one or more of electromagnetic-wave shielding function, near infrared ray blocking function, and anti-reflection function. The glass substrate has a thickness of 1.8-3.2 mm, an average surface compressive stress of 20-70 MPa, and a warp ratio of the glass substrate of 1.0% or less. The surface compressive stress is applied by an air blast cooling process or a chemical reinforcing process. The filter substrate is disposed over a front surface of the display device.

The invention belongs to the field of image recognition, and particularly relates to a collimating film, an interference-reducing collimating film, a laminated collimating film, a hole-sealing laminated collimating film and a preparation method thereof. The invention provides a collimation film, an interference-reducing collimation film, a fitting type collimation film, a hole-sealing fitting type collimation film and a preparation method thereof in order to solve the problem of bubbles of a fitting type collimation film designed by adopting a relatively thick light shielding layer. According to the invention, the hole sealing fitting type collimating film comprises a collimating lens layer, a flexible substrate layer, a collimating hole layer and a hole sealing fitting adhesive layer. The collimating lens layer comprises a micro-lens array and a lens layer; the collimation hole layer comprises a shading medium and a collimation hole array formed after the shading medium is hollowed out; and the hole sealing fitting adhesive layer fully fills the collimation hole array of the collimation hole layer. The hole sealing fitting type collimating film provided by the invention is applied to an image recognition module, so that the recognition accuracy of the image recognition module is high.

The invention discloses a large-aperture small-distortion optical lens, and the optical lens comprises a front lens group, a diaphragm element, a rear lens group and a light filter, wherein the frontlens group, the diaphragm element, the rear lens group and the light filter are sequentially arranged from the object space to the image space. The front lens group comprises a first lens, a second lens, a third lens and a fourth lens, and the rear lens group comprises a fifth lens, a sixth lens and a seventh lens. The first lens, the third lens and the seventh lens are all spherical lenses, and the fifth lens and the sixth lens are combined to form a bonding lens with the positive focal power. According to the invention, the first, second and seventh lenses are all aspherical lenses, therebyeffectively reducing the volume of the lens, and enabling the structure of the lens to be more compact. The optical lens is small in size, is small in optical distortion, basically has no distortion in image, is high in imaging quality, and is accurate in imaging color.

The invention relates to a large-aperture low-sensitiveness optical lens assembly which comprises a first lens, a second lens, a third lens and a fourth lens. The first lens is provided with positive light focal power, and the image side face of the first lens is a convex face. The second lens is provided with negative light focal power, and the object side face of the second lens is a concave face. The third lens is provided with an aspheric face and positive light focal power. The object side face of the fourth lens is a concave face, and the object side and the image side face are aspheric faces. The lens assembly meets the following relational expression: 0.3<F1/TLT<1.0, 0.7<F/TTL<1.3, and D3/D2<3. By means of the structure, when specific conditions are met, the lens assembly is beneficial for reducing the sensitivity of a system, promotes periphery resolution and illuminance, and improves the imaging effect.

The invention provides an inspection cell for inspecting an ophthalmic lens. The inspection cell is a solid block that has a bottom planar surface, a top surface, and an indentation in the top surface. The indentation is adapted to receive an ophthalmic lens. which is to be inspected. The invention additionally provides an inspection unit for an ophthalmic lens, which holds one or more of the inspection cells.

A neodymium and yttrium doped calcium fluoride laser amplifier of laser diode pumping helium cooling is composed of a pumping source, a coupling lens set, a spectroscope and an amplification gain medium. The amplification gain medium is actively cooled through high-speed helium, the temperature distribution evenness of the amplification gain medium is improved, the largest thermal stress is reduced, and the thermal management effect is improved; meanwhile, spontaneous emission amplification is reduced, energy storage efficiency is improved, lasers with high average power, high repetition frequency and high beam quality can be outputted, and the neodymium and yttrium doped calcium fluoride laser amplifier has the advantages of being compact in structure, good in reliability and high in efficiency.

The present invention discloses a double-incident slit high-resolution imaging spectral system. The double-incident slit high-resolution imaging spectral system is composed of double incident slits, a beam splitting subsystem and a detection subsystem; the beam splitting subsystem includes a main reflector, a convex grating, a secondary reflector and a correction lens; and the detection subsystem includes a filter and a surface array detector. The system has the advantages of high resolution, short re-visiting time, lower cost and highly-integrated space system. A double-slit structure enables the system to obtain spectral information of two target areas simultaneously with observation performed for once, so that re-visiting time can be shortened; and the main reflector, the convex grating and the secondary reflector are designed to be concentric, and therefore, the aberration of the system can be reduced, and the resolution of the system can be improved.

The invention relates to a compact high-zoom-ratio high-definition continuous zooming fog-penetrating camera lens. A front fixed group A with positive focal power, a zoom group B with negative focal power, a fixed diaphragm C, a rear fixed group D with positive focal power, a compensation group E with positive focal power and a color filter group F with zero focal power are sequentially arranged in an optical system of the camera lens along an incident direction of light rays from left to right, color filters of different film systems are plated in a switching way to realize the switching of avisible light working mode and a fog-penetrating working mode; the cut-off waveband is 650-1100 nm in the visible light working mode, the cut-off waveband is 350-700 nm in the fog-penetrating workingmode, and the continuous variable focal distance is realized by changing the intervals among the front fixed group A, the zoom group B and the diaphragm C; the optimal image plane offset caused by the position change of the zoom group is compensated by changing the intervals among the rear fixed group D, the compensation group E and the color filter group F, and the optical total length is kept unchanged in the zooming process.

The invention discloses a low-sensitivity and high-quality fidelity camera assembly. The camera assembly sequentially comprises a first lens having positive focal power, a crescent-shaped second lens having positive focal power and bending towards an object space, a third lens having negative focal power, an imaging face, an optical filter and a diaphragm in the direction from the object side to the image side along an optical axis of the camera assembly, wherein the first lens is provided with a convex face towards the object side and a convex face towards the image side; the second lens is provided with a concave face towards the object side; the optical filter is located between the third lens and the imaging face; the diaphragm is located between the object space and the first lens. In addition, the camera assembly meets the following conditions that (1) 0.7<F/F1<1.2, -0.7<F3/F2<-1.5; (2) 0.6<F12/Y<1.4; (3) 4<T12/T23<11; (4) 0.2<BL/TTL<0.6. The camera assembly is designed aiming at a current high-pixel photographing digital product, has the characteristics of being low in sensitivity and high in fidelity, and can guarantee high imaging quality on the premise of meeting miniaturization.

A low-distortion wide-angle lens comprises a first lens (L1), a second lens (L2), a third lens (L3), a fourth lens (L4), a diaphragm (S), a fifth lens (L5), a sixth lens (L6), a seventh lens (L7), an eighth lens (L8), a ninth lens (L9) and a tenth lens (L10), which are sequentially arranged from an object side to an image side along an optical axis, wherein the third lens (L3), the fifth lens (L5) and the seventh lens (L7) have negative focal power, and the sixth lens (L6) and the tenth lens (L10) have positive focal power. Through reasonable placement and matching of the positive and negative focal power lenses and the concave and convex lenses, optical distortion of imaging is reduced, the lens is enabled not to be virtually focused in a temperature range of -30 DEG C to 70 DEG C, and imaging pixels are further improved. Due to the reasonable arrangement of the lenses, the requirement of tolerance sensitivity between the lenses can be reduced, meanwhile, the overall size of the lens can be reduced, the weight can be reduced, and the cost can be saved.

The invention provides a specific near-infrared-absorption polyester thin membrane capable of achieving mass production and a preparation method of the polyester thin membrane. The thin membrane is aBAB-type three-layer-structure thin membrane, wherein an A layer is a specific near-infrared-absorption layer, a B layer is a surface modification layer, and the total thickness of the thin membrane is 30-100 microns; the A layer is prepared from, by weight, 50%-99.9% of optical-grade high-transmittance PET chips, 0%-50% of optical-grade high-transmittance PCT chips and 0.1%-1% a near-infrared adsorbent; a B layer is prepared from, by weight, 5%-35% of PET master batches containing silicone and 65%-95% of optical-grade high-transmittance PET chips. The prepared near-infrared-absorption polyester thin membrane has the advantages of being good in heat resistance and low in transmittance of light within the near-infrared band of 700-900 nanometers.

The invention discloses a digital reproducing auxiliary system for Chinese calligraphy and paintings, which comprises a system frame, a picture taking assembly, a lighting assembly, a picture hanging bracket and a picture horizontal-draught assembly, wherein the system frame is used for causing the picture taking assembly and the lighting assembly to move along the direction of a guide rail; the picture taking assembly is used for supporting a large-format digital camera and can move in the horizontal direction and the upright direction perpendicular to the guide rail; the lighting assembly is used for supporting a light box and can cause the light box to move in the upright direction and rotate around an upright shaft; the picture hanging bracket can move in the upright direction to adapt to the height of the format and can adjust the distance between hooks to adapt to the width of the format; and the picture horizontal-draught assembly is used for smoothly fitting format media. The lighting assembly is arranged between the picture taking assembly and the picture horizontal-draught assembly, and the picture horizontal-draught assembly is composed of an adsorption flat box body, a negative-pressure gas tank and a negative-pressure pump. One surface of the adsorption flat box body fitted with a format has uniformly distributed micropores, and the other surface is communicated with the negative-pressure gas tank through a pipeline. The system greatly increases the photo taking quality, reduces the labor intensity, and is particularly suitable for a large-batch reproducing operation.

The invention relates to an imaging system of an off-axis optical field. The imaging system of the off-axis optical field sequentially comprises an off-axis reflection subsystem, a micro-reflection mirror array and an optical sensing device along the imaging optical path, wherein the off-axis reflection subsystem comprises at least one optical device containing a reflection curved surface, and atleast one adjusting mechanism which is matched with the corresponding optical device with the reflection curved surface; the imaging optical path passes through the optical device with the reflectioncurved surface; each adjusting mechanism is used for adjusting the optical device with the reflection curved surface.