Fundamentals of Photomicrosensors

The Photomicrosensor (photointerrupter) is a compact optical sensor that senses objects or object positions with an optical beam.

A built-in type Photomicrosensor, also known as a photointerrupter, is a basic optical sensor used in consumer equipment (e.g. multifunction printers, IP cameras, robotic cleaners) and commercial devices (e.g. ATMs, copy machines, amusement machines, smart gas meter).

• Basics
  • What is a Photomicrosensor?
  • Types & Classifications
  • Structure & Principle
  • Connection / Mounting
• Terminology
  • Phototransistor Output
  • Photo IC Output
• Design Ⅰ
  (Design for Emitter Side)
  • Characteristics of Emitter
  • Driving Current Level
  • Design Method
• Design Ⅱ
  (Design of Systems Incorporating Photomicrosensors)
  • (1) Phototransistor Output
  • Characteristics of Detector Element
  • Changes in Characteristics
  • Design of Basic Circuitry
  • Design of Applied Circuit
  • (2) Photo IC Output
  • Circuit Configuration
  • LED Forward Current (IF) Supply Circuit
  • Detector Circuit
• Precautions
  • Transmissive(Slot) Type
  • Reflective Type