Near-infrared laser focusing lens and laser printing device
US9533514B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Oct 31, 2012 |
| Grant date | Jan 3, 2017 |
| Priority date | — |
| Expiry date | Oct 31, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S3/02
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A near-infrared laser focusing lens and a laser printing device are provided. The lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens (L1, L2, L3, L4, L5) which are coaxially arranged along a transmission direction of incident light rays, wherein the first lens (L1) is a negative plane-concave lens; the second lens and the third lens (L2, L3) are positive biconvex lenses; and the fourth lens and the fifth lens (L4, L5) are positive meniscus lenses; and a concave surface (S2) of the first lens (L1) is opposite to the second lens (L2), and the middle parts of the fourth lens and the fifth lens (L4, L5) both reversely protrude towards the transmission direction of light beams. After the shapes and the relative locations of the lenses are designed, the near infrared light can be clearly imaged, and the geometrical aberration of the lens can be effectively corrected, so as to obtain a clear flat field. In addition, because of having a large relative aperture and visual field and a long working distance, the lens is a microscope objective simultaneously having a large visual field, a large relative aperture, a long working distance and a flat field, a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.