PHOTO DETECTING ELEMENT, AND OPTICAL PICK-UP DEVICE AND OPTICAL DISC DRIVE INCLUDING THE PHOTO DETECTING ELEMENT

摘要

Provided is a photo detecting element that has a simplified structure and that is easily manufactured and assembled, and an optical pick-up device including the photo detecting element. The photo detecting element includes an optical sensor, an amplifier for amplifying a signal from the optical sensor, and a non-linear multi-step variable resistor to adjust a gain of the amplifier