relation: http://miis.maths.ox.ac.uk/miis/603/
title: High speed video capture for mobile phone cameras
creator: Burke, M.
creator: Burns, S.
creator: Cook, S.P.
creator: Dellar, P.J.
creator: Dewynne, J.
creator: Hickey, C.
creator: Hjorth, P.G.
creator: Lee, W.T.
creator: Melnik, A.
creator: Moroney, K.
creator: Murphy, E.
creator: O'Callaghan, R.
creator: Vynnycky, M.
subject: Machines / Production
description: 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
type: Study Group Report
type: NonPeerReviewed
format: application/pdf
language: en
identifier: http://miis.maths.ox.ac.uk/miis/603/1/Analog_Report_ESGI87.pdf
identifier:   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]