Lens optical system
AssigneeHyundai Mobis Co., Ltd.
InventorsYong Hee Won, Jae Myung Ryu
Life of this patent
Estimating the term…
Abstract
A four-lens optical system is provided which is capable of minimizing a total length of an optical system while having a high numerical aperture (NA), and, more particularly, to an optical system including a first lens, a second lens, a third lens, and a fourth lens that are sequentially arranged from an object side to an image side of the four-lens optical system, in which the first lens and the second lens continuously disposed in front of the optical system are each configured to have positive refractive power and in which the first lens is a lens is made of a plastic material, and the fourth lens is a lens made of a glass material.
Claims17
A lens optical system for a vehicle lamp having a light source that generates heat sufficient to deform an adjacent plastic lens, the system comprising:
- a first lens;
- a second lens;
- a third lens;
- and
- a fourth lens,
- wherein:
- the first lens, the second lens, the third lens and the fourth lens are sequentially arranged in order from an object side to an image side of the lens optical system,
- a numerical aperture (NA) of the lens optical system is 0.6 or more,
- the first lens and the second lens each has positive refractive power,
- the first lens is a lens comprised of a plastic material,
- the fourth lens is closer to a light source of the lamp than the first lens, the second lens and the third lens, and
- the fourth lens is comprised of a glass material so that the fourth lens is not deformed by the heat generated by the light source notwithstanding the fourth lens being closer to a light source of the lamp than the first lens, the second lens and the third lens.
Dependencies are inferred from the claim text.