Microscopic image detecting instrument and automatic focusing method therefor
US9703171B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 18, 2015 |
| Grant date | Jul 11, 2017 |
| Priority date | — |
| Expiry date | Feb 8, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B21/365
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A microscopic image detecting instrument includes a microscope, a photographing device, a driver, a mark having a predetermined distance from an object, and a controller coupled to the photographing device and the driver. The microscope includes an object stage for holding the object and an objective lens for focusing on and magnifying the object. The photographing device is set above the objective lens to photograph an image presented by the objective lens. The controller controls the driver to move at least one of the object stage and the objective lens to an actual focusing position, according to an actual focal length to the object. The actual focal length to the object is calculated by the controller according to a comparison between an optical definition of a mark image taken as a preliminary target of focus against a predetermined definition calibration curve and the distance between the mark and the object.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.