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Lead Contents

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.

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Primary Contents

Definition of Terms

TermReference diagramExplanation
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.