公开(公告)号：US12181646B2

公开(公告)日：2024-12-31

申请号：US17518812

申请日：2021-11-04

Applicant: Union Optech Co., Ltd.

Inventor： Liwei Quan ,  Shoulin Li ,  Hao Wang ,  Junqiang Gong

IPC: G02B13/16 ,  G02B3/04 ,  G02B9/64 ,  G02B13/00 ,  G03B21/14

Abstract: The present application provides an optical system and a projection device. The optical system includes a display unit, a first lens group, a second lens group and a reflector which are sequentially arranged along a light transmission direction. The first lens group has a positive focal power, the second lens group has a negative focal power, a total of focal powers of the second lens group and the reflector is positive. A distance from a side of the first lens group close to the display unit to another side of the second lens group far away from the display unit is T0, a distance from the side of the second lens group far away from the display unit to the reflector is T, and T0/T is greater than or equal to 0.8 and less than or equal to 1.1. The optical system provided by the present application is small in size and portable.

公开(公告)号：US11822062B2

公开(公告)日：2023-11-21

申请号：US17505873

申请日：2021-10-20

Applicant: Union Optech Co., Ltd.

Inventor： Yuancai Li ,  Liwei Quan ,  Shoulin Li ,  Hao Wang

IPC: G02B13/24 ,  G02B13/00 ,  G03B21/53 ,  H04N9/31

CPC classification number: G02B13/24 ,  G02B13/0045 ,  G03B21/53 ,  H04N9/31

Abstract: Disclosed is an ultra-short focus projecting optical system, which includes a display unit, a first lens group having a positive focus power, a second lens group having a positive focus power, a third lens group having a negative focus power, and an aspherical reflector arranged sequentially along a projection direction. The first lens group includes a first lens, a second lens and a diaphragm arranged sequentially along the projection direction. The first lens is a glass aspherical lens, the second lens is a glass spherical lens, and the first lens and the second lens are bent toward the diaphragm from their respective centers to their respective peripheries. The ultra-short focus projecting optical system and a projection device provided by this application can realize a large aperture and high resolution.