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Optical switch

Optical switch (Optical sensor)

An optical switch is a non-contact sensor that detects the presence of objects by using light. It is made of a light projection area that emits light and a photosensitive area that receives light. When the projected light is blocked or reflected by the object to be detected, the light level incident on the photosensitive area changes, and this change is converted into an electric signal and output.
It is used for object presence detection, passage detection, arrival detection, level-difference detection, surface state detection, and so on in a wide variety of everyday situations from industrial applications including production lines and distribution warehouses to household applications.

Hamamatsu provides the LEDs used as light sources and the photodiodes and photo ICs that are used as photosensors.

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LEDs

Hamamatsu LEDs for optical switches feature high output and long service life. The lineup includes a wide variety of products that you can choose from such as (1) a type (660 to 700 nm) that emits visible red light to notify people of the operating state and to make optical axis alignment easier, (2) a near infrared type (850 to 945 nm) for security applications and applications that require high output, and (3) a reflow-mount-compatible, surface-mount type with or without a lens that constricts the spreading of light.

Peak emission wavelength: 660 nm

Peak emission wavelength: 850 nm

Peak emission wavelength: 945 nm

Si PIN photodiodes

These high-speed, high-sensitivity Si PIN photodiodes support the emission wavelengths of red LEDs and infrared LEDs.

Surface mount type (mounting using solder reflow is possible)

Photo IC for optical switch

These photo ICs include functions needed for optical switches. In combination with an LED, the photo IC can be used as a reflective or transmissive sensor and provides stable operation even under a certain degree of background light. In addition, it is equipped with an operation indicator, margin indicator, operation logic switch, sync/async switch, and output short-circuit protection functions.

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