18764098. LENS POSITION CONTROL DEVICE AND ENDOSCOPE APPARATUS (FUJIFILM CORPORATION)
LENS POSITION CONTROL DEVICE AND ENDOSCOPE APPARATUS
Organization Name
Inventor(s)
Tomonori Yokota of Kanagawa (JP)
LENS POSITION CONTROL DEVICE AND ENDOSCOPE APPARATUS
This abstract first appeared for US patent application 18764098 titled 'LENS POSITION CONTROL DEVICE AND ENDOSCOPE APPARATUS
Original Abstract Submitted
A lens position control device is a lens position control device that controls a position of a variable magnification lens of a zooming optical system provided at an endoscope and includes a DC motor with a brush that generates a drive force for changing the position of the variable magnification lens, a drive circuit that drives the DC motor with a brush by repeating an application state where a drive voltage is applied between a pair of terminals of the DC motor with a brush and a release state where the terminals are released from each other, and a processor that controls the position of the variable magnification lens based on a time-integrated value of a counter-electromotive force generated at the DC motor with a brush in the release state.