Head lamp for car

Patent metadata

Field	Value
Publication number	US-9528674-B2
Application number	US-201414523697-A
Country	US
Kind code	B2
Filing date	Oct 24, 2014
Priority date	Sep 1, 2014
Publication date	Dec 27, 2016
Grant date	Dec 27, 2016

Abstract

Disclosed is a head lamp for a car having asymmetric magnifications for upper, lower, left, and right lens standards, and the head lamp includes: a light source; and an aspheric lens disposed in a front direction of the light source, and configured to have different horizontal and vertical magnifications.

First claim

What is claimed is:

1. A head lamp for a car, comprising:
a light source; and
an aspheric lens disposed in front of the light source, and configured to have different magnifications in first and second directions,
wherein the aspheric lens has an aspherical surface Z that satisfies the following equation,

Z
=

C
X

⁢

X
2

+

C
X

⁢

Y
2

1
+

1
-

[

1
+

K
X

]

⁢

C
X
2

⁢

X
2

-

(

1
+

K
Y

⁢

c
Y
2

⁢

Y
2

)

+

∑

N
=
2

∞

⁢

10
⁢

⁢

A

2
⁢

⁢
N

⁡

[

(

1
-

B

2
⁢

⁢
N

)

⁢

X
2

+

(

1
+

B

2
⁢
N

)

⁢

Y
2

]

N

,

where X is a coordinate of the aspherical surface in the first direction, Y is a coordinate of the aspherical surface in the second direction, C x is a curvature in the first direction, C Y is a curvature in the second direction, K x is a conic constant in the first direction, K Y is a conic constant in the second direction A 2N is a coefficient of a hi h order term of a first aspherical surface, and B 2N is a coefficient of a high order term of a second aspherical surface.

2. The head lamp of claim 1 , wherein the light source is a light emitting diode (LED) device.

3. The head lamp of claim 1 , wherein the aspheric lens is an anamorphic lens.

4. The head lamp of claim 1 , wherein the light source moves from a focus of the aspheric lens by 2 mm or more in the second direction to emit light.

Assignees

• Hyundai Mobis Co Ltd

Inventors

• Lee Hyun Soo

Classifications

• F21S41/27

  Thick lenses · CPC title

• G02B3/04

  with continuous faces that are rotationally symmetrical but deviate from a true sphere {, e.g. so called "aspheric" lenses} · CPC title

• G02B19/0014

  at least one surface having optical power · CPC title

• F21V5/04

  of lens shape · CPC title

• F21S41/26

  Elongated lenses · CPC title