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US 12,353,057 B2Granted
Fixed-focus lens
AssigneeYoung Optics Inc.
InventorsPei-Ching Liu, Kuo-Chuan Wang
Life of this patent
Estimating the term…
Abstract
A fixed-focus lens includes an anti-radiation first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in order in a direction. An aperture stop is disposed between the first lens and the fourth lens. A ratio of a lens diameter of the first lens to an overall length is within a range of 0.4 to 0.5, where the overall length is an axial distance between an outer surface of the first lens and an outer surface of the seventh lens. Each of the first lens to the seventh lens is a spherical glass lens.
Claims18
A fixed-focus lens, comprising:
- an anti-radiation first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in order in a direction, wherein the second lens has a negative refractive power;
- and
- an aperture stop disposed between the first lens and the fourth lens, a ratio of a lens diameter of the first lens to an overall length being within a range of 0.4 to 0.5, where the overall length is an axial distance between an outer surface of the first lens and an outer surface of the seventh lens, and each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens is a spherical glass lens.
A fixed-focus lens, comprising:
- a light yellowish-brown first lens with a positive refractive power, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in order from an object side to an image side, each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens being a glass lens, an overall length that is an axial distance between an outer surface of the first lens and an outer surface of the seventh lens being smaller than 60 mm, an axial distance between the first lens and the second lens being within a range of 7 mm to 12 mm, and an F-number of the fixed-focus lens being within a range of 1.4 to 1.7.
Dependencies are inferred from the claim text.