53results about How to "Suppress chromatic aberration" patented technology

An imaging lens substantially includes seven lenses, constituted by: a first lens having a positive refractive power and a convex surface toward an image side; a second lens having a negative refractive power; a third lens having a positive refractive power; a fourth lens; a fifth lens having a positive refractive power; a sixth lens; and a seventh lens having a negative refractive power, a concave surface toward an image side, and at least one inflection point in the surface toward the image side; provided in this order from an object side. All of the first lens through the seventh lens are single lenses.

Provided are an optical glass having high-refractivity, low-dispersion and anomalous partial dispersion properties, having excellent processability, being excellent as an anomalous partial dispersion glass for suppressing chromatic aberration, containing P5+, Al3+ and alkaline earth metal ions selected from the group consisting of Mg2+, Ca2+, Sr2+ and Ba2+ as essential cationic components and F- and O2- as essential anionic components, wherein the ratio of content of Ba2+ to the total content R2+ of Mg2+, Ca2+, Sr2+ and Ba2+, Ba2+ / R2+, is 0.01 or more but less than 0.5 on the basis of cationic %, and having an Abbe's number (nud) of 68 or more, optical glass having an Abbe's number (nud) of 68 or more, a partial dispersion ratio of 0.535 or more and a frictional abrasion of 500 or less and an optical glass which is to be polished in a polishing step for producing an optical element and which is a fluorophosphate glass having a frictional abrasion of 500 or less.

A luminous flux optically modulated by an image display device is projected to be magnified on a screen by a projection optical system includes: a first optical system having a positive first lens group including eight lenses, a negative second lens group including three lenses, and a third lens group including an aspheric single lens; and a second optical system including an aspheric reflecting mirror. The projection optical system is an off-axial optical system, and forms the intermediate image between the first optical system and the second optical system. Moreover, the expressions T1 / Y<12.5 and T12 / f1<6.0 are satisfied where T1 is the overall length of the first optical system, Y is the maximum light ray height on an image display device, T12 is the distance between the first optical system and the second optical system, and f1 is the focal length of the first optical system.

Provided is an optical glasses that has high refractivity and low dispersion and anomalous partial dispersion capability and that has excellent processability and devitrification resistance and ensures that the occurrence of striae can be inhibited, the optical glass including an optical glass having a refractive index (nd) of 1.54 to 1.60, an Abbe's number (vd) of 65 to 78, a partial dispersion ratio of 0.530 or more, a specific gravity of 4.0 or less and a viscosity, measured at its liquidus temperature, of 4 dPa·s or more and an optical glass comprising as cationic components, by cationic %, 20 to 50% of p5+, 0.1 to 20% of Al3+, 0.1 to 20% of Mg2+, 0 to 20% of Ca2+, 0 to 20% of Sr2+, 0.1 to 30% of Ba2+ and 0 to 10% of y3+, and further comprising, as anionic components, F− and O2−, wherein the ratio of the content of Mg2+ to the content of Al3+, Mg2+ / Al3+, based on cationic %, is 1.2 or less.

A compact low-cost imaging lens which provides brightness with an F-value of 2.5 or less and a wide field of view and corrects aberrations properly, meeting the demand for low-profileness. The imaging lens elements are arranged in the following order from an object side to an image side: a first lens with positive refractive power having a convex surface on the object side; a second lens with negative refractive power; a third lens with positive or negative refractive power having at least one aspheric surface; a fourth lens with positive refractive power; a fifth lens as a meniscus double-sided aspheric lens having a concave surface near an optical axis on the image side; and a sixth lens as a meniscus lens having a concave surface near the optical axis on the object side. The both surfaces of the fifth lens have pole-change points off the optical axis.

An imaging lens substantially includes seven lenses, constituted by: a first lens having a positive refractive power and a convex surface toward an image side; a second lens having a negative refractive power; a third lens having a positive refractive power; a fourth lens; a fifth lens having a positive refractive power; a sixth lens; and a seventh lens having a negative refractive power, a concave surface toward an image side, and at least one inflection point in the surface toward the image side; provided in this order from an object side. All of the first lens through the seventh lens are single lenses.

An image pickup lens can form an excellent optical image on a compact image pickup element having a large number of pixels. The image pickup lens includes, sequentially from the object side, an optical aperture, a first lens made of glass and having at least a spherical surface at the object side and a positive refracting power, a second lens made of resin and having two aspherical surfaces and a negative refracting power, a third lens made of glass and having at least a spherical surface at the object side and a positive refracting power, and a fourth lens made of resin and having two aspherical surfaces and a negative refracting power.

The present invention provides a charged particle beam apparatus which is provided with a tilting deflector which is disposed between a charged particle source and an objective lens and tilts a charged particle beam, wherein a first optical element includes an electromagnetic quadrupole which generates dispersion to suppress the dispersion which is generated by deflection by the tilting deflector, and a second optical element is composed of a deflector for deflecting the charged particle beam which enters the first optical element or an electromagnetic quadrupole which causes the charged particle beam to generate a dispersion different from the dispersion generated by the first optical element.

There is provided an interlayer film for laminated glass with which laminated glass having a gradation pattern with suppressed color irregularity can be prepared. The interlayer film for laminated glass according to the present invention includes a first resin layer containing a thermoplastic resin and a plasticizer and a second resin layer containing a thermoplastic resin, a plasticizer and inorganic particles, and the first resin layer being arranged on a first surface side of the second resin layer, wherein a gradation part being a region where the parallel light transmittance is greater than 30% and less than 60% and being a region where the thickness of the second resin layer is continuously decreased in the direction orthogonal to the thickness direction of the interlayer film at the time of preparing the laminated glass exists, and the complex viscosity at 200° C. of the second resin layer is greater than or equal to 0.7 times and less than or equal to 2 times the complex viscosity at 200° C. of the first resin layer.

Luminescence diode lighting module and lighting device using same for improving lighting quality by inhibiting color difference generation is provided in this invention. A luminescence diode lighting module LM comprises a luminescence diode (1) and a lens (20), wherein, the luminescence diode (1) comprises a fluorescent substance layer (12) which is arranged in such a manner that the wavelength transformation is performed to part of emitting light from a luminescence diode chip (6) provided on a substrate (2); the lens (20) is arranged opposite to the luminescence diode (1) and has a convex lens part (21) with incident light mainly having small emission angle, and a reflecting part (23) arranged around the convex lens part with incident light mainly having big emission angle; and the first light distribution characteristic (A) is almost the same with the second light distribution characteristic (B), wherein the first light distribution characteristic (A) is formed by light emitted from the luminescence diode chip (6) and transmitted directly from the convex lens part (21) and reflecting part (23); the second light distribution characteristic (B) is formed by light emitted from the fluorescent substance layer (12) and transmitted from the convex lens part (21) and reflecting part (23).

An imaging lens forms an image on a solid-state image sensor. The constituent elements are arranged in order from an object side: an aperture stop, positive first lens having a convex object-side surface, negative second lens having a concave image-side surface, positive or negative double-sided aspheric third lens, positive fourth lens having a convex image-side surface, and negative double-sided aspheric fifth lens having a concave image-side surface, all the lenses are made of plastic, and conditional expressions (1) through (4) below are satisfied:2.0<r7 / r8<5.0  (1)−1.35<f4 / f5<−0.8  (2)TLA / 2ih<0.80  (3)1.50<Nd<1.65  (4)where r7 denotes curvature radius of the fourth lens object-side surface, r8 denotes curvature radius of the fourth lens image-side surface, f4 denotes fourth lens focal length, f5 denotes fifth lens focal length, TLA denotes total track length, ih denotes maximum image height, and Nd denotes refractive index at d-ray of the first to fifth lenses.

An image pickup lens, comprises sequentially from an object side: an aperture stop, a first lens being a positive meniscus lens which has a convex surface at the object side and a concave surface at an image side opposite to the object side, and a second lens having a concave surface at the object side and an image side surface whose radius of curvature on an paraxial region is infinite or a negative value, wherein the first lens is the second lens and the image side surface of the second lens includes an aspheric surface to make a positive power strong toward a lens peripheral region, and wherein the image pickup lens is made to satisfy the following conditional formulas.1.55<n1<1.80  (1)0.4<D3 / f<0.6  (2)40.0<ν2<90.0  (3)

The invention provides a method and a system of image edge defuzzification, which are used for solving the problem that the method of the image edge defuzzification in the prior art has influences on image quality and is apt to produce chromatic aberration. The method comprises constructing a three-side filter formed by a geometric space filter, a color space filter and a gradient filter; and enabling the original image to be input in the three-side filter to obtain edge defuzzification output images. By means of the technical scheme, the method and the system are favorable for obtaining of better image quality and restraining of the chromatic aberration.

The invention discloses a method for passivating the aberration of a conformal optical system based on wavefront coding. The method includes the following steps that: an odd-symmetry phase mask plate is additionally installed at the diaphragm of the conformal optical system; the wavefront of the optical system is modulated; a coded image is formed on a detector; and image decoding processing is performed on the coded image by means of a digital filtering means, so that a final clear image can be obtained. Since a wavefront coding technique is introduced, a larger focal depth can be realized with the luminous flux and imaging resolution of the conformal optical system ensured, and astigmatism, spherical aberration, chromatic aberration, and aberration caused by defocusing which is further caused by installation error and temperature change can be suppressed. The method of the invention is simple to operate. With the method adopted, under a condition that the complexity of the conformal optical system is not increased, aberration can be passivated, and image quality can be improved, and therefore, the capture performance and tracking precision of a seeker can be improved.

A luminous flux optically modulated by an image display device is projected to be magnified on a screen by a projection optical system includes: a first optical system having a positive first lens group including eight lenses, a negative second lens group including three lenses, and a third lens group including an aspheric single lens; and a second optical system including an aspheric reflecting mirror. The projection optical system is an off-axial optical system, and forms the intermediate image between the first optical system and the second optical system. Moreover, the expressions T1 / Y<12.5 and T12 / f1<6.0 are satisfied where T1 is the overall length of the first optical system, Y is the maximum light ray height on an image display device, T12 is the distance between the first optical system and the second optical system, and f1 is the focal length of the first optical system.

A luminous flux optically modulated by an image display device is projected to be magnified on a screen by a projection optical system includes: a first optical system having a positive first lens group including eight lenses, a negative second lens group including three lenses, and a third lens group including an aspheric single lens; and a second optical system including an aspheric reflecting mirror. The projection optical system is an off-axial optical system, and forms the intermediate image between the first optical system and the second optical system. Moreover, the expressions T1 / Y<12.5 and T12 / f1<6.0 are satisfied where T1 is the overall length of the first optical system, Y is the maximum light ray height on an image display device, T12 is the distance between the first optical system and the second optical system, and f1 is the focal length of the first optical system.

The present invention discloses an optical system, an image capturing module, electronic device and a carrier. The optical system includes a first lens having a negative meandering force, a second lens having a negative meandering force, an image-side surface of the second lens being concave in a paraxial region thereof, a third lens having a positive meandering force, an object-side surface of the third lens being convex in a paraxial region thereof, the image side surface of the third lens is a convex surface near the optical axis; the object side surface of the fourth lens is a convex surface near the optical axis; the image side surface of the fifth lens is a convex surface near the optical axis; the object side surface of the sixth lens is a convex surface near the optical axis; and the maximum field angle FOV of the optical system, the effective focal length f of the optical system and the half Imgh of the image height corresponding to the maximum field angle of the optical system meet the condition that (FOV*f) / (2*Imgh) is larger than 40.0 deg and smaller than 53.0 deg. This design provides a high pixel optical imaging system.