Abstract: A camera module actuator is described including a magnet, a coil disposed to face the magnet, and a driver configured to apply a driving signal to the coil to move the magnet. The camera module actuator also includes a detector configured to detect a position of the magnet from a change in inductance of the coil, based on the movement of the magnet.
Type:
Grant
Filed:
March 2, 2017
Date of Patent:
November 10, 2020
Assignee:
Samusng Electro-Mechanics Co., Ltd.
Inventors:
Je Hyun Bang, Hoon Heo, Shin Young Cheong, Byung Gi An, Dae Hyun Jeong
Abstract: An apparatus for driving a light emitting device (LED) is provided. The apparatus for driving the LED includes a first driving control element, a first current detection unit, a first effective value detection unit, a first reference signal generation unit, and a first comparison unit. The first driving control element controls a current flowing through a first LED channel, in response to a first pulse-width modulated control signal. The first current detection unit detects the current flowing through the first LED channel. The first effective value detection unit detects an effective value of the current detected by the first current detection unit. The first reference signal generation unit generates a preset reference signal having a sawtooth waveform. The first comparison unit compares the reference signal from the first reference signal generation unit with the effective value from the first effective value detection unit.
Type:
Application
Filed:
April 30, 2010
Publication date:
June 16, 2011
Applicant:
SAMUSNG ELECTRO-MECHANICS CO., LTD.
Inventors:
Seung Kon KONG, Jae Shin LEE, Jung Hyun KIM, Jung Sun KWON, Bo Hyun HWANG