Optical system
AssigneeSamsung Electro-Mechanics Co., Ltd.
InventorHo Sik You
Life of this patent
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Abstract
There is provided an optical system configured of 4-sheet lenses to have a wide angle of view. The optical system includes: a first lens having a positive refractive power, with both surfaces being convex; a second lens having a negative refractive power, with both surfaces thereof being concave; a third lens having a positive refractive power and a meniscus shape; and a fourth lens having a negative refractive power, with both surfaces thereof being concave, all of which are disposed in order from an object to a front upper surface. In the optical system, the refractive powers of the first lens to the fourth lens satisfy the following Conditional Expression 1. f 1 f 4 < - 1.1 Conditional Expression 1 In Conditional Expression, f1: a focal distance of the first lens and f4: a focal distance of the fourth lens.
Claims6
An optical system, comprising:
- a first lens having positive refractive power, with both surfaces thereof being convex;
- a second lens having negative refractive power, with both surfaces thereof being concave;
- a third lens having positive refractive power and a meniscus shape;
- and
- a fourth lens having negative refractive power, with both surfaces thereof being concave, all of which are disposed in order from an object to a front upper surface,
- wherein the refractive powers of the first lens to the fourth lens satisfy the following Conditional Expressions 1 and 6:
- f
-
-
- 1
- f
-
-
- 4
- <
- -
- 1.1
- ,
- and
- Conditional
-
-
- Expression
-
-
- 1
- -
- 1.5
- <
- f
-
-
- 2
- F
- <
- -
- 0.7
- Conditional
-
-
- Expression
-
-
- 6
- and
- -
- 1.5
- <
- f
-
-
- 2
- F
- <
- -
- 0.7
- ,
- Conditional
-
-
- Expression
-
-
- 6
- where f1 is the focal distance of the first lens, f is the focal distance of the fourth lens, f2 is the focal distance of the second lens, and F is the entire focal distance of the optical system.
Dependencies are inferred from the claim text.