Photomicro Sensors

These Optical Sensors provide a compact, low-cost method to detect workpieces. Many models are available, including Slot-type Sensors (through-beam) for non-modulated or modulated light, Reflective Sensors, and Sensors with separate emitters and receivers.

Overview	Features
Principles	Classifications
Engineering Data	Further Information

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Primary Contents

Definition of Terms

Term		Reference diagram	Explanation
Non-modulated light		___	Method used to detect light steadily emitted by the emitter element.
Modulated light		___
Sensing distance	Through-beam Sensors (with slot)		The slot width, i.e., the distance between the opposing faces of the emitter and receiver, is the sensing distance.
	Through-beam Sensors		The minimum distance that can be set considering factors such as the variation betweenproducts and fluctuations in temperature. Note: The actual value under standard conditions for each method is longer than the rated sensing distance.

	Retroreflective Sensors
	Diffuse-reflective Sensors Limited-reflective Sensors		The minimum distance that can be set for a standard sensing object (white paper) considering factors such as the variation between products and fluctuations in temperature. Note: The actual value under standard conditions for each method is longer than the rated sensing distance.

Differential distance			The difference in distance between the operating point and releasing point.
Response frequency			The frequency at which an object satisfying specified conditions (size, transparency rate, reflection factor, sensing distance, and power supply voltage) can be repeatedly detected.
Response time			The delay from the light input turning ON/OFF until the control output operation or release operation. The following equation generally applies. Operating time (Ton) ≈ Releasing time (Toff)
Ambient illumination			The level of illumination on the sensing surface that enables stable operation of the Sensor.