eprintid: 603
rev_number: 12
eprint_status: archive
userid: 12
dir: disk0/00/00/06/03
datestamp: 2013-04-03 15:02:21
lastmod: 2015-05-29 20:13:22
status_changed: 2013-04-03 15:02:21
type: report
metadata_visibility: show
item_issues_count: 0
creators_name: Burke, M.
creators_name: Burns, S.
creators_name: Cook, S.P.
creators_name: Dellar, P.J.
creators_name: Dewynne, J.
creators_name: Hickey, C.
creators_name: Hjorth, P.G.
creators_name: Lee, W.T.
creators_name: Melnik, A.
creators_name: Moroney, K.
creators_name: Murphy, E.
creators_name: O'Callaghan, R.
creators_name: Vynnycky, M.
title: High speed video capture for mobile phone cameras
ispublished: pub
subjects: machines
studygroups: esgi87
companyname: Analog Devices
full_text_status: public
abstract: We consider an electromechanical model for the operation of a voice coil motor in a mobile phone camera, with the aim of optimizing how a lens can be moved to a desired focusing motion. Although a methodology is developed for optimizing lens shift, there is some concern about the experimentally-determined model parameters that are at our disposal. Central to the model is the value of the estimated magnetic force constant, Kf: its value determines how far it is actually possible to move lens, but it appears that, from the value given, it would not be possible to shift the lens through the displacements desired. Furthermore, earlier experiments have also estimated the value of the back EMF constant, Kg , to be roughly five times greater than Kf, even though we present two theoretical arguments that show that Kf = Kg: a conclusion supported by readily-available manufacturers’ data.
date: 2012
citation:   Burke, M. and Burns, S. and Cook, S.P. and Dellar, P.J. and Dewynne, J. and Hickey, C. and Hjorth, P.G. and Lee, W.T. and Melnik, A. and Moroney, K. and Murphy, E. and O'Callaghan, R. and Vynnycky, M.  (2012) High speed video capture for mobile phone cameras.  [Study Group Report]     
document_url: http://miis.maths.ox.ac.uk/miis/603/1/Analog_Report_ESGI87.pdf