NDLI: Dynamic focusing lens for expanding depth of focus of optical microscope

Content Provider	IEEE Xplore Digital Library
Author	Kaneko, T. Yamamoto, A. Idogaki, T. Hattori, T.
Copyright Year	1996
Description	Author affiliation: Res. Labs., Nippondenso Co. Ltd., Aichi, Japan (Kaneko, T.)
Abstract	A dynamic focusing lens for expanding the depth of focus of an optical microscope has been developed. This microscope can be utilized for real-time observation of three-dimensional microstructures. The dynamic focusing lens shifts the focal plane of an objective. When the focal plane is rapidly and continuously shifted along the optical axis, focused and defocused images of each focal plane come into view continuously on an eyepiece or a monitoring screen. However, due to the afterimage of human visual perception, a focused image of the entire object is obtained as if the depth of focus is expanded. The dynamic focusing lens consists of a thin glass diaphragm, of which the diameter is 10 mm and the average thickness is 11 /spl mu/m, a glass plate surrounded by a ring-shaped metal diaphragm, and transparent working fluid sealed between them. Six piezoelectric unimorph piled actuators are located on the upper side to press the metal diaphragm. Pressure of the working fluid deforms the glass diaphragm into convex shape, and the working fluid and the glass diaphragm work as a convex lens. The focal length of the lens can be changed responsively up to 150 Hz. When the dynamic focusing lens is working at 60 Hz, the depth of focus is expanded about four times and the resolution is maintained approximately constant in the range from 0 to 8 mm.
Starting Page	157
Ending Page	162
File Size	802654
Page Count	6
File Format	PDF
ISBN	0780335961
DOI	10.1109/MHS.1996.563417
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-10-02
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Lenses Focusing Glass Optical microscopy Fluid dynamics Microstructure Monitoring Humans Visual perception Piezoelectric actuators
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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