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Variable focal lentgh lens system including a focus state reference subsystem

A lens system and lens technology, applied to TV system parts, lenses, focusing devices, etc., can solve problems affecting system performance and accuracy

Active Publication Date: 2019-06-28
MITUTOYO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] While such VFL lenses can change the effective focus position at very high rates, changes in conditions such as temperature slightly alter their resonant characteristics and cause changes in optical power and modulation frequency, which can affect system performance and accuracy

Method used

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  • Variable focal lentgh lens system including a focus state reference subsystem
  • Variable focal lentgh lens system including a focus state reference subsystem
  • Variable focal lentgh lens system including a focus state reference subsystem

Examples

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Embodiment Construction

[0041] figure 1 is a block diagram of an exemplary machine vision inspection system 10 that may be used as an imaging system according to the methods described herein. The machine vision inspection system 10 includes a vision measuring machine 12 operatively connected to exchange data and control signals with a control computer system 14 . Control computer system 14 is also operatively connected to exchange data and control signals with monitor or display 16 , printer 18 , joystick 22 , keyboard 24 and mouse 26 . Monitor or display 16 may display a user interface suitable for controlling and / or programming the operation of machine vision inspection system 10 . It should be understood that in various embodiments, a touch screen tablet or the like may alternatively and / or redundantly provide the functionality of any one or all of elements 14 , 16 , 22 , 24 and 26 .

[0042] Those skilled in the art will appreciate that control computer system 14 may generally be implemented us...

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Abstract

A focus state reference subsystem comprising a focus state reference object and reference object optics is for use in a variable focal length (VFL) lens system comprising a VFL lens, a controller thatmodulates its optical power, and a camera located along an imaging path including an objective lens and the VFL lens. The reference object optics transmits image light from the focus state referenceobject along a portion of the imaging path through the VFL lens to the camera. Respective focus state reference regions (FSRRs) of the focus state reference object include a contrast pattern fixed atrespective focus positions relative to the reference object optics. A camera image that includes a best-focus image of a particular focus state reference region (FSRR) defines a best-focus reference state associated with that FSRR, wherein that best-focus reference state comprises a VFL optical power and / or effective focus position of the VFL lens system through the objective lens.

Description

[0001] Cross References to Related Applications [0002] This application is a continuation-in-part of U.S. Patent Application No. 15 / 850,149, entitled "VARIABLE FOCAL LENGTH LENS SYSTEMINCLUDING A FOCUS STATE REFERENCE SUBSYSTEM," filed December 21, 2017, the disclosure of which is hereby incorporated by reference in its entirety. technical field [0003] The present disclosure relates to precision metrology using high-speed variable focus (VFL) lenses (e.g., in machine vision inspection systems), and more particularly to monitoring the focus state of a VFL imaging system and / or a high-speed variable focus in the imaging system The optical power of the lens. Background technique [0004] Sophisticated non-contact metrology systems such as precision machine vision inspection systems (or simply "vision systems") can be used to obtain precise dimensional measurements of objects and inspect various other object characteristics, and can include computers, cameras, and optical sy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/232G02B21/24
CPCG02B21/361G02B3/14H04N23/67G02B21/006G02B27/10G03B13/34G02B7/102G02B21/00H04N23/73
Inventor M.纳赫姆R.K.布里尔J.A.萨默思P.G.格拉德尼克
Owner MITUTOYO CORP
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