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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

(1) Classification by Sensing Method

(1) Slot Sensors

Slot Sensors are suitable for applications using a thin sensing object, or "dog," that require a highly precise sensing position. Setup is easy because no optical axis adjustment is needed. There are many product variations. The necessary configuration, connection method, and other items can be selected from a wide array of models.

(2) Through-beam Sensors

Through-beam Sensors are suitable for applications that require relatively long sensing distances.

(3) Retroreflective Sensors

Retroreflective Sensors are suitable for applications that require relatively long sensing distances. They have the advantage of requiring less work for wiring and optical axis adjustment when compared to Through-beam Sensors.

(4) Diffuse-reflective Sensors

Diffuse-reflective Sensors are suitable for applications where the sensing object is thick and won't fit into the slot of a Slot Sensor.

(5) Limited-reflective Sensors

Limited-reflective Sensors are basically the same as Diffuse-reflective Sensors, but they are suitable when background objects are present. (With Diffuse-reflective Sensors, the presence of a background object with a higher reflectivity than the sensing object (e.g., metals with mirror finishing) may cause sensing instability.)

(2) Considerations when Choosing a Sensing Method

(1) Slot Sensors

Shape, slot width, connection (pre-wired/connector)

Presence or absence of external light interference (non-modulated light/modulated light)

Output configuration (Light-ON/Dark-ON, NPN/PNP)

Indicator (Light-ON/Dark-ON)

(2) Through-beam Sensors

Shape (built-in Amplifier, optical fiber), sensing distance

Output configuration (Light-ON/Dark-ON)

(3) Retroreflective Sensors

Sensing distance

Output configuration (Light-ON/Dark-ON)

(4) Diffusive/Limited-reflective Sensors

Shape (built-in Amplifier, optical fiber), sensing distance

Presence or absence of background objects (Diffuse-reflective/Limited-reflective Sensors)

External light interference (non-modulated light/modulated light)

Output configuration (Light-ON/Dark-ON)