4 results about "Half field" patented technology

The application discloses an optical imaging lens, which comprises first, second, third, fourth, fifth and sixth lenses in sequence from the object side to the image side. A circumferential area of the object side of the first lens is concave; a circumferential area of the image side of the second lens is concave; a circumferential area of the image side of the third lens is convex; an optical axis area of the object side of the fifth lens is convex; the first, fourth and sixth lenses have positive refractive power, and satisfy 28.000≤HFOVD21t42 / (D11t21+D42t62), so that the advantages of large field of view, small aperture value and good imaging quality can be achieved. HFOV represents the half field of view of the optical imaging lens, D21t42 represents the distance on the optical axis from the object side of the second lens to the image side of the fourth lens, D11t21 represents the distance on the optical axis from the object side of the first lens to the object side of the second lens, and D42t62 represents the distance on the optical axis from the image side of the fourth lens to the image side of the sixth lens.

The application discloses an optical lens, which comprises, in sequence from an object side to an image plane along an optical axis, an aperture stop, a first lens with positive refractive power, a second lens with positive refractive power, the object side of which is a convex surface, a third lens with positive refractive power, a fourth lens with positive refractive power, the image side of which is a convex surface, a fifth lens with negative refractive power, the object side of which is a concave surface and the image side of which is a convex surface, a sixth lens with positive refractive power, the object side of which is a concave surface and the image side of which is a convex surface near the optical axis, and a seventh lens with negative refractive power, the object side of which is a convex surface near the optical axis and the image side of which is a concave surface near the optical axis, wherein the image height IH corresponding to the maximum half field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy 1.5 < IH / EPD < 1.9. The application can realize the balance of large aperture, small total length and long focal length by reasonably constraining the surface shape and refractive power of each lens.

The application discloses an optical imaging system, which comprises: a lens group sequentially comprising, from an object side to an image side along an optical axis, a first lens with positive refractive power, a second lens with negative refractive power, a third lens with negative refractive power, a fourth lens with refractive power, a fifth lens with positive refractive power, a sixth lens with positive refractive power, and a seventh lens with negative refractive power, wherein the second lens is a meniscus lens; a plurality of spacer elements, comprising a fifth spacer element at least partially in contact with an image side surface of the fifth lens and a sixth spacer element at least partially in contact with an image side surface of the sixth lens; and a lens barrel for accommodating the lens group and the plurality of spacer elements; wherein the effective focal length f of the optical imaging system, the maximum half field angle Semi-FOV of the optical imaging system, the inner diameter d6m of the image side surface of the sixth spacer element, and the inner diameter d5m of the image side surface of the fifth spacer element satisfy: 2.5 < f x tan (Semi-FOV) / (d6m-d5m) < 11.5.

The present subject matter described an optical microscopy device (3) for a portable imaging system, such as a smartphone. The optical microscopy device (3) comprises an optical lens assembly with eight to fifteen lens elements. The optical lens assembly has an optical magnification in a range of about 1× to about 7.8×, an airy radius in a range of about 3 micron to about 23.25 micron, a depth of field in a range of about 20 micron to about 338 micron, a numerical aperture in a range of about 0.015 to about 0.115, a half field of view in a range of about 12 degrees to about 30 degrees, and a length in a range of about 6.5 millimeter (mm) to about 57 mm.