Vehicle projection lens
AssigneeYoung Optics Inc.
InventorsChen-An Chiang, Kuo-Chuan Wang
Life of this patent
Estimating the term…
Abstract
A vehicle projection lens includes an aspheric first lens with a positive refractive power, a cemented lens comprised of a spherical second lens and a spherical third lens, and a spherical fourth lens with a positive refractive power arranged in order from a magnified side to a minified side. The vehicle projection lens satisfies the following conditions: (1) an aperture stop is disposed between the third lens and the fourth lens; (2) an F-number of the vehicle projection lens is less than or equal to 0.86; (3) a full field of view of the vehicle projection lens ranges from 30 to 70 degrees; and (4) an effective focal length of the vehicle projection lens ranges from 13 mm to 28 mm.
Claims19
A vehicle projection lens, comprising:
- an aspheric first lens with a positive refractive power, a cemented lens, and a spherical fourth lens with a positive refractive power arranged in order from a magnified side to a minified side of the vehicle projection lens, the cemented lens comprising a spherical second lens and a spherical third lens, the first lens, the second lens, the third lens and the fourth lens being arranged in order along a direction, the second lens being a concave lens and having a negative refractive power, and the third lens having a positive refractive power, wherein the vehicle projection lens satisfies the following conditions:
- (1) an aperture stop is disposed between the third lens and the fourth lens;
- (2) an F-number of the vehicle projection lens is less than or equal to 0.86;
- (3) a full field of view of the vehicle projection lens ranges from 30 to 70 degrees;
- and
- (4) an effective focal length of the vehicle projection lens ranges from 13 mm to 28 mm.
A vehicle projection lens, comprising:
- a first lens, a second lens, a third lens and a fourth lens arranged in order along a direction, the first lens being an aspheric lens with a refractive power, the second lens being a concave lens with a negative refractive power, the third lens having a refractive power, the fourth lens having a positive refractive power, and the fourth lens being closest to a minified side among the first, the second, the third and the fourth lenses of the vehicle projection lens, wherein the vehicle projection lens satisfies the following conditions:
- (1) an aperture stop is disposed between the third lens and the fourth lens;
- (2) an F-number of the vehicle projection lens is less than or equal to 0.86;
- (3) an effective focal length of the vehicle projection lens ranges from 13 mm to 28 mm;
- (4) a length measured along an optical axis between two outermost lens surfaces with refractive powers at opposite ends of the vehicle projection lens ranges from 40 to 67 mm;
- and
- (5) a full field of view of the vehicle projection lens ranges from 30 to 70 degrees.
Dependencies are inferred from the claim text.