5results about How to "Reduce astigmatism" patented technology

Microlens peripheral defocus eyeglasses belong to the technical field of eyeglasses. The eyeglasses of the present invention are arranged as a central correction area, a nasal microlens area, a temporal microlens area, and a lower microlens area. The nasal microlens area and the temporal microlens area are each provided with two gradient microlens areas with different refractive powers and a full-quantity microlens area. Or the eyeglasses are arranged as a central correction area and an annular microlens area. The annular microlens area is provided with two gradient annular microlens areas with different refractive powers and a full-quantity annular microlens area, or the lower area of ​​the annular microlens area is provided with an annular lower microlens area. The microlens area is composed of a plurality of independent microlens arrays, and at least two or more microlenses in the microlens array area have different refractive powers, shapes, and diameter lengths. The independent microlens is arranged as a convex lens relative to the central correction area, with a diameter length of 0.2 mm to 4.5 mm, and a distance between two adjacent microlenses of 0.1 mm to 0.4 mm.

The utility model discloses a far infrared optical system and a far infrared optical lens. The far infrared optical system sequentially comprises a spherical lens, a super lens and an aspherical lens from an object side to an image side along an optical axis, the spherical lens has positive focal power, the curvature radius of the surface, close to the object side, of the spherical lens is a positive value, and the curvature radius of the surface, close to the image side, of the spherical lens is a positive value; the super lens has positive focal power; the aspheric lens has positive focal power, the surface, close to the object side, of the aspheric lens protrudes towards the image side, the surface, close to the image side, of the aspheric lens protrudes towards the image side, the refractive index of the aspheric lens is equal to that of the spherical lens, and the Abbe number of the aspheric lens is equal to that of the spherical lens. The astigmatism of the far infrared optical system is small, and the imaging quality is excellent. Meanwhile, the far infrared optical system provided by the utility model also has the advantages of small size and low cost.

The present invention provides an optical lens for projection, which comprises: a concave reflector arranged in sequence from the object side to the image side, a first lens group with negative optical power, a second lens group with positive optical power moving forward and backward along the optical axis of the optical lens for projection, a third lens group with positive optical power and a galvanometer, wherein an aperture is arranged between the lenses of the third lens group; the first lens group comprises a first lens and a second lens arranged in sequence, wherein the first lens faces the concave reflector. The present invention has the advantages of no distortion at large angles and image telecentricity.

The invention discloses an optical system, a pick-up lens and an electronic device, and aims to realize lightening and thinning and shorter total length of the optical system and improve the pixel and imaging quality of the optical system. The optical system sequentially comprises a diaphragm, a first lens with positive focal power, a second lens with negative focal power, a third lens with focal power, a fourth lens with focal power, a fifth lens with focal power, a sixth lens with positive focal power and a seventh lens with negative focal power from an object side to an image side along an optical axis, the object side surface of the first lens, the object side surface of the second lens, the image side surface of the third lens, the image side surface of the fifth lens and the object side surface of the sixth lens are convex surfaces in a paraxial region. The image side surface of the first lens, the image side surface of the second lens, the object side surface of the third lens, the object side surface of the fifth lens, the image side surface of the sixth lens, and the object side surface and the image side surface of the seventh lens are concave surfaces at a paraxial region. The optical system satisfies the relational expression: 1.45 lt; fNOlt, FNOlt; 1.9, 79 degree lt; a FOVlt; the angle is 91 degrees, 1.2 lt; and TTL / ImgHlt; and 1.4.

An optical out-of-focus prevention and control myopia lens is characterized in that a central optical area and a peripheral out-of-focus area are arranged on the front surface of the lens, a first micro convex lens array is arranged in the peripheral out-of-focus area, and the first micro convex lens array comprises a plurality of micro convex lenses arranged in a honeycomb structure; a second micro convex lens array is obtained after the first micro convex lens array deflects around the optical center by a degree A, a third micro convex lens array is obtained after the first micro convex lens array deflects around the optical center by a degree B, the degree A and the degree B are not integers and are not larger than 60 degrees, and the degree B is not equal to integral multiples of the degree A. The three micro-convex lens arrays form a non-uniform micro-convex lens array combination, so that moire fringes are avoided when the three micro-convex lens arrays face an image with a uniform period, and the situations of eye fatigue, dizziness and the like of a wearer are further avoided; due to the non-uniformity, the total defocusing amount of the micro convex lenses at the dense positions is large, the total defocusing amount of the micro convex lenses at the loose positions is small, and eyestrain is further delayed.