Imaging lens
AssigneeYoung Optics Inc.
InventorsWei-Hao Huang, Kuo-Chuan Wang, Bing-Ju Chiang
Life of this patent
Estimating the term…
Abstract
An imaging lens including a first lens group, a second lens group, and an aperture stop is provided. The first lens group is disposed between an object side and an image side. The second lens group is disposed between the first lens group and the image side. The aperture stop is disposed between the first lens group and the second lens group. The imaging lens includes at least three cemented lenses, each of the cemented lenses includes at least one lens having non-zero refractive power, and at least one lens of each of the cemented lenses has an Abbe number greater than 80.
Claims21
An imaging lens comprising:
- a first lens group disposed between an object side and an image side;
- a second lens group disposed between the first lens group and the image side;
- an aperture stop disposed between the first lens group and the second lens group;
- a first optical element and a second optical element which are disposed between the first lens group and the image side;
- and
- a switching unit disposed between the first lens group and the image side, the switching unit connected to the first optical element and the second optical element, the switching unit being configured to switch the first optical element or the second optical element into a light path, wherein the first optical element is an invisible light filter,
- wherein the imaging lens comprises at least three cemented lenses, and each of the cemented lenses comprises at least one lens having non-zero refractive power.
An imaging lens comprising:
- a first lens group disposed between an object side and an image side;
- a second lens group disposed between the first lens group and the image side;
- an aperture stop disposed between the first lens group and the second lens group;
- a first optical element and a second optical element which are disposed between the first lens group and the image side;
- and
- a switching unit connected to the first optical element and the second optical element, the switching unit being configured to switch the first optical element or the second optical element into a light path from the first lens group to the image side, wherein the first optical element is an invisible light filter,
- wherein when an incident light having a wavelength of 850 nm passes through the imaging lens to from an image on the image side, a focus shift of the image with respect to green light is less than 0.015 mm.
An imaging lens comprising:
- a first lens group disposed between an object side and an image side;
- a second lens group disposed between the first lens group and the image side;
- and
- an aperture stop disposed between the first lens group and the second lens group,
- wherein the imaging lens comprises at least three cemented lenses, each of the cemented lenses comprises at least one lens having non-zero refractive power, and at least one lens of each of the cemented lenses has an Abbe number greater than 80.
Dependencies are inferred from the claim text.