Ultra-compact lens system for fluorescence imaging
AssigneeOsong Medical Innovation Foundation
InventorsHyeon Jin Bang, Seung Rag Lee, Byung Jun Park, Ki Ri Lee, Eung Jang Lee
Life of this patent
Estimating the term…
Abstract
An ultra-compact lens system for fluorescence imaging includes a first lens, a second lens and third lens. The first lens has a Meniscus shape including first and second surfaces facing each other. The first surface is concave, and each of the first and second surfaces is an aspherical surface. The second lens is adjacent to the first lens and includes third and fourth surfaces facing each other. Each of the third and fourth surfaces is convex and aspherical surface. The third lens is adjacent to the second lens and includes fifth and sixth surfaces facing each other. Each of the fifth and sixth surfaces is concave and aspherical surface.
Claims6
A lens system comprising:
- a first lens having a Meniscus shape comprising first and second surfaces facing each other, wherein the first surface is concave, and each of the first and second surfaces is an aspherical surface;
- a second lens adjacent to the first lens and comprising third and fourth surfaces facing each other, wherein each of the third and fourth surfaces is convex and aspherical surface;
- a third lens adjacent to the second lens and comprising fifth and sixth surfaces facing each other, wherein each of the fifth and sixth surfaces is concave and aspherical surface;
- a glass adjacent to the third lens and comprising seventh and eighth surfaces facing each other;
- and
- an iris having a ninth surface between the first and second lens,
- wherein Equation (1) is satisfied,
- 3.5
- <
- TTL
- F
- <
- 5.
- Equation
-
- (
- 1
- )
- when the distance from the first surface of the first lens to an upper surface located outside of the glass is TTL and a focal length of the lens system is F,
- wherein Equation (3) is satisfied,
- 0.8
- <
- f
-
- 2
- F
- <
- 1.
- Equation
-
- (
- 3
- )
- when a focal length of the second lens is f2, and a focal length of the lens system is F,
- wherein Equation (5) is satisfied,
- 0.4
- <
- ❘
- "\[LeftBracketingBar]"
- f
-
- 2
- f
-
- 3
- ❘
- "\[RightBracketingBar]"
- <
- 0.65
- Equation
-
- (
- 5
- )
- when a focal length of the second lens is f2, and a focal length of the third lens is f3.
The lens system of claim, 1 wherein the aspherical surface is defined as Equation (6),
- 𝓏
- =
- ch
- 2
- 1
- +
- 1
- -
- (
- 1
- +
- k
- )
-
- c
- 2
-
- h
- 2
- +
- A
-
- h
- 4
- +
- Bh
- 6
- +
- Ch
- 8
- +
- Dh
- 10
- +
- …
- Equation
-
- (
- 6
- )
- when z is a distance in a direction of an optical axis from a vertex of the lens system, h is a distance in a direction perpendicular to the optical axis, c is a radius of curvature at the vertex, k is a conic constant, A is a quaternary aspherical coefficient, B is a 6th order aspherical coefficient, C is a 8th order aspherical coefficient, and D is a 10th order aspherical coefficient.
Dependencies are inferred from the claim text.