Zoom lens system
First Claim
1. An imaging system comprising:
- a housing; and
a zoom lens system enclosed in the housing, the zoom lens system including a first lens element and a second lens element, a surface on one of the first and second lens elements having a diffractive optical surface disposed thereon, an aperture stop, and a lens carrier coupled to the first and second lens element and the aperture stop, the lens carrier to move the first and second lens element and the aperture stop axially.
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Accused Products
Abstract
A compact zoom lens system having four injection-molded singlet lens elements is described. In one embodiment, the compact zoom lens system includes a lens carrier and first and second lens elements coupled to the lens carrier. One surface of the first or second lens elements having a diffractive optical surface disposed thereon to correct chromatic aberrations of light passing therethrough. The lens carrier moves the first and second lens elements axially to change a focal length of the lens system. Third and fourth lens elements are fixed on either side of the first and second lens elements. The lens carrier includes an aperture stop placed proximate to the diffractive optical surface to correct chromatic aberrations over an entire range of focal lengths. The first lens element is made out of flint-like material while the other lens elements are made out of crown-like material. Moreover, the zoom lens system includes an anti-aliasing surface on one of the lens elements to control aliasing effects. A plurality of light suppression elements are provided to suppress stray light paths from scattering across a detector array of the zoom lens system.
9 Citations
31 Claims
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1. An imaging system comprising:
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a housing; and
a zoom lens system enclosed in the housing, the zoom lens system including a first lens element and a second lens element, a surface on one of the first and second lens elements having a diffractive optical surface disposed thereon, an aperture stop, and a lens carrier coupled to the first and second lens element and the aperture stop, the lens carrier to move the first and second lens element and the aperture stop axially. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An imaging system comprising:
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a housing; and
a zoom lens system enclosed within the housing, the zoom lens system including a first lens element, a second lens element placed in front of the first lens element, the second lens element including a diffractive optical surface disposed on one of its surfaces to correct chromatic aberrations of light passing therethrough, a third lens element placed in front of the first and second lens elements, a fourth lens element placed in front of the first through third lens elements, and a lens carrier coupled to the second and third lens elements, the lens carrier to axially move the second and third lens elements over two or more focal lengths. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A method comprising:
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providing an aperture stop, a first lens element and a second lens element forming a zoom lens system, a surface of one of the first lens element and the second lens element having a diffractive optical surface; and
adjusting the aperture stop, the first lens element and the second lens element to correct chromatic aberrations of light passing therethrough. - View Dependent Claims (29, 30, 31)
modifying a field of view of the zoom lens system by placing a third lens element in front of the first and second lens elements.
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31. The method of claim 30 further comprising reducing a focal length of the zoom lens system by placing a fourth lens element behind the first and second lens elements.
Specification