(i) Technical Field
The present invention relates to image pickup devices and focal plane shutters.
(ii) Related Art
Japanese Unexamined Patent Application Publication Nos. 2010-181522 and 2008-256844 disclose a focal plane shutter driving a shutter by use of an electromagnet.
In a case of using the actuator as a drive source for driving the shutter, a change in temperature of a coil of the actuator also changes the resistance value of the coil. This might cause an exposure period to vary.