Series:	PM-64
Packaging:	Bulk
Part Status:	Obsolete
Sensing Distance:	0.197" (5mm)
Sensing Method:	Transmissive
Output Configuration:	PNP - Dark-ON/Light-ON - Selectable
Current - DC Forward (If) (Max):	50mA
Current - Collector (Ic) (Max):	15mA
Voltage - Collector Emitter Breakdown (Max):	30V
Response Time:	20µs
Operating Temperature:	-25°C ~ 55°C
Mounting Type:	Chassis Mount
Package / Case:	Module, Connector, Slot Type
Type:	Unamplified

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Introduction

Optical sensors are useful in a wide range of applications for sensing a physical parameter based on the reflection or transmission of light. The photointerrupters within this subclass of optical components include those with slot type, and transistor output PM-R64P models. This article will discuss the application field and working principle of PM-R64P photointerrupters.

Application Field

PM-R64P photointerrupters operate utilizing transmission or difference of the reflected light from the output. This type of photointerrupter is suitable for applications in which detection of objects passing between the emitter and detector across a slot gap is required. It can recognize the presence of objects that pass through the slot gap with a different positional resolution on the order of 0.1mm. Window widths of 0.2 mm and 0.3mm round the device\'s capabilities.PM-R64P photointerrupters are ideal for applications in which the need for durability, heat resistance, or a high-speed operational efficiency is paramount. Motors, rods, and threading tools in automated industrial processes are primary beneficiaries. The device excels in dimensional measurement applications, such as origin markings on paper roll printing or glass plate cutting. Casinos make use of the device\'s superior detection accuracy and reliability for slot machines and gaming consoles. The device is also compatible with lighting and medical devices for sensing the presence of individuals.

Working Principle

PM-R64P photointerrupters employ a slot type structure for the sensing of objects passing along it. An infrared light emitter is positioned adjacent to an infrared light detector on one side of the slot type unit. The light emitted from the emitter is transmitted across the slot gap to the detector, where differences between the transmitted light and the reflected light are used to detect the presence of the object. When no object is present in the slot gap, a constant flow of light is transmitted from the emitter to the detector and the corresponding amount of light is reflected. Conversely, when an object interrupts the transmitted light, either a reduction or complete prevention will occur, depending on the size and localization of the object. This change of light levels is then detected by the phototransistor in the PM-R64P to provide a switch contactor output. Depending on the model, PM-R64P photointerrupters are either offered in a photocoupler or a direct transistor output configuration. The photocoupler model operates independently of the voltage, enabling the switching functions of the datasheet to be used in various circuit arrangements. By contrast, the direct transistor output model operates on an output voltage of 6 to 32 volts, has higher sensitivity compared to the photocoupler model, and is recommended for simpler circuits.

Conclusion

PM-R64P photointerrupters offer a reliable and accurate transmission–reflection sensing solution ideal for sensing the presence of objects passing along a slot type unit. This device is a helpful addition to casinogaming systems, automated industrial processes, and lighting/medical devices where sensing accuracy and reliability are essential. Depending on the application, both the photocoupler and the direct transistor output models are offered by PM-R64P, with each having distinctive advantages depending on the system requirements.

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