Image Taking Optical System
AssigneeLargan Precision Co., Ltd.
InventorHsin-Hsuan Huang
Life of this patent
Estimating the term…
Abstract
An image taking optical system, sequentially arranged from an object side to an image side along an optical axis comprising: a front lens group, a stop and a rear lens group. The front lens group comprises at least a meniscus front-group first lens element with a convex object-side surface. The rear lens group comprises at least three lens elements. Through the means of field adjustments that result in desirable distorted images, the image taking optical system may shorten the total length while enhancing the ability to create a larger field of view for panorama usages in compact cameras and mobile phones.
Claims24
An image taking optical system, sequentially arranged from an object side to an image side comprising:
- a front lens group, a stop and a rear lens group;
- wherein the front lens group comprises at least one lens element, and the rear lens group comprises at least three lens elements;
- the front lens group comprises a front-group first lens element being a meniscus lens element nearest to the object side and having a convex object-side surface;
- and
- HFOV is half of the maximum view angle of the image taking optical system (unit in degree), DIST8 is an optical distortion at 80% of the maximum image height (unit in percent), and the following relations are satisfied:
- 30°<HFOV<45°;
- −50%<DIST8<−30%.
An image taking optical system, sequentially arranged from an object side to an image side comprising:
- a front lens group, a stop and a rear lens group;
- wherein, the front lens group comprises at least one lens element, and the rear lens group comprise at least three lens elements;
- the front lens group comprises a front-group first lens element nearest to the object side having a convex object-side surface and a concave image-side surface;
- the rear lens group comprises a rear-group rear lens element nearest to an image plane having a concave image-side surface and at least two inflection points between the center and the periphery of the image-side surface thereof;
- f is a focal length of the image taking optical system, f1 is a focal length of the front-group first lens element, and the following relation is satisfied:
- −0.8<f/f1<0.3.
Dependencies are inferred from the claim text.