Camera telecentric lens
AssigneeChangzhou AAC Raytech Optronics Co., Ltd.
InventorTakaaki Teranishi
Life of this patent
Estimating the term…
Abstract
The present disclosure relates to the field of camera optical lenses, and discloses a camera telecentric lens. The camera telecentric lens includes from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, a sixth lens, a seventh lens, an eighth lens and ninth lens, following relational expressions are satisfied: 1.980≤n2≤2.300; −0.600≤f8/f≤−0.050; 0.600≤R4/R3≤4.000; and 0.145≤NA*f/WD≤0.220. The camera telecentric lens has good optical performance and high magnification, and can meet the precision detection requirement of a machine vision system.
Claims13
A camera telecentric lens, comprising from an object side to an image side:
- a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens;
- wherein a focal length of the camera telecentric lens is f, a refractive index of the second lens is n2, a central curvature radius of an object-side surface of the second lens is R3, a central curvature radius of an image-side surface of the second lens is R4, a focal length of the eighth lens is f8, a working distance of the camera telecentric lens is WD, and a numerical aperture of the camera telecentric lens is NA, following relational expressions are satisfied:
- 1.
- 9
-
- 8
-
- 0
- ≤
- n
-
- 2
- ≤
- 2
- .
- 3
-
- 00
- ;
- -
- 0.6
-
- 0
-
- 0
- ≤
- f
-
- 8
- /
- f
- ≤
- -
- 0
- .
- 0
-
- 50
- ;
- 0.6
- ≤
- R
-
- 4
- /
- R
-
- 3
- ≤
- 4.
- ;
- and
- 0.145
- ≤
- NA
- ⋆
- f
- /
- WD
- ≤
- 0.22
- 0
- .
Dependencies are inferred from the claim text.