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US 7,841,785 B2Granted
Imaging lens, imaging device, portable terminal, and method for manufacturing imaging lens
AssigneeKonica Minolta Opto, Inc.
InventorsYusuke Hirao, Keiji Matsusaka
Life of this patent
Estimating the term…
Abstract
An imaging lens (LN) includes at least one lens block (BK), and an aperture stop (ape). The lens block (BK) includes parallel flat lens substrates (LS) formed of different materials, and a lens (L). In the imaging lens (LN), a first lens block (BK1) positioned closest to an object includes a first lens substrate (LS1) and a lens (L[LS1o], and a prescribed conditional expression is satisfied.
Claims26
An imaging lens comprising:
- at least one lens block including a lens substrate that is a plane-parallel plate, and a lens contiguous with at least one of object-side and image-side substrate surfaces of the lens substrate, the lens exerting a positive or negative optical power;
- and an aperture stop restricting light amount, wherein said lens included in said lens block is formed of a material different from a material out of which said lens substrate is formed;
- wherein said lens block comprises a first lens block disposed at a most object-side position, the first lens block including, as said lens substrate, a first lens substrate, and as said lens, a lens L[LS1o] contiguous with an object-side substrate surface of the first lens substrate, wherein an object-side lens surface of the lens L[LS1o] is convex to an object side, wherein said lens block further comprises a second lens block located to an image side of the first lens block, the second lens block including, as said lens substrate, a second lens substrate, and as said lens, a lens L[LS2o] contiguous with an object-side substrate surface of the second lens substrate and a lens L[LS2m] contiguous with an image-side substrate surface of the second lens substrate, wherein an object-side lens surface of the lens L[LS2o] is concave to an object side, and wherein conditional formula (A1) below is fulfilled:
- 0≦DT[LS1o−ape]/d[LS1]≦1 (A1)
- where
- DT[LS1o−ape] represents a distance from the object-side substrate surface of the first lens substrate to an aperture stop surface;
- and d[LS1] represents a thickness of the first lens substrate along an optical axis;
- and
- Wherein conditional formula (A3) is fulfilled:
- 1.4<f[all]/Y′<1.9 (A3)
- where
- f[all] represents a focal length of the entire imaging lens;
- and
- Y′ represents a maximum image height.
11 more elements
An imaging lens comprising:
- at least one lens block disposed at a most object-side position of said imaging system said at least one lens block including:
- a plate-like first lens substrate, and a lens L[LS1o], having an optical power, bonded to an object-side surface of the first lens substrate, and an aperture stop restricting light amount, wherein said lens included in said at least one lens block is formed of a material different from a material of said first lens substrate;
- wherein the following conditional formula (A1) is fulfilled:
- 0≦DT[LS1o−ape]/d[LS1]≦1 (A1)
- where
- DT[LS1o−ape]
- represents a distance from the object-side substrate surface of the first lens substrate to an aperture stop surface;
- and
- d[LS1]
- represents a thickness of the first lens substrate along an optical axis;
- and
- Wherein conditional formula (A3) is fulfilled:
- 1.4<f[all]/Y′<1.9 (A3)
- where
- f[all] represents a focal length of the entire imaging lens;
- and
- Y′ represents a maximum image height.
14 more elements
Dependencies are inferred from the claim text.