Read Head/Sensor for Position Encoders | Component Specifications

Product Specifications

Technical details and manufacturing context for Read Head/Sensor

Definition

The read head/sensor is the sensing element in position encoders that optically, magnetically, or inductively reads position markings on scales or disks, converting physical position into electrical signals for precise position feedback in motion control systems. It is a component used in machinery and equipment manufacturing, typically integrated into linear or rotary encoders. The read head operates by detecting position markings such as optical gratings, magnetic poles, or inductive patterns on a scale or disk. Through photoelectric, magnetic, or inductive sensing technologies, it generates electrical signals proportional to position. These signals are then processed by the encoder electronics to provide position feedback to a motion controller. The read head is available in various configurations to suit different interface requirements, such as TTL or 1Vpp analog outputs. Typical specifications include a supply voltage of 5 V DC ±5%, output signal of 1Vpp, resolution ranging from 0.001 to 0.1 mm depending on scale pitch, and accuracy of ±5 to ±20 µm including scale errors. Operating temperature ranges from -10 to 70 °C, storage temperature from -20 to 85 °C, and humidity from 20 to 80% RH (non-condensing). Ingress protection is rated IP54 to IP65 per IEC 60529. Vibration resistance is 10 to 2000 Hz at 100 m/s² per IEC 60068-2-6, and shock resistance is 1000 m/s² (half-sine, 6 ms) per IEC 60068-2-27. Cable length options are 1 to 10 meters with shielded twisted pair, and weight ranges from 50 to 200 g without cable. Materials used include aluminum alloy, stainless steel, optical glass, and electronic components. These specifications are typical reference ranges and must be verified for the specific model and application with the legal manufacturer or supplier. The read head is a critical component for ensuring accurate position measurement in industrial automation, CNC machinery, and other motion control systems.

Working Principle

The read head operates by detecting position markings on a scale or disk. Depending on the sensing technology, it uses optical gratings, magnetic poles, or inductive patterns. In optical systems, a light source and photodetector read the grating lines. In magnetic systems, a magnetoresistive or Hall sensor detects magnetic pole transitions. In inductive systems, coils sense changes in inductance. The sensor generates electrical signals that are proportional to the position, which are then amplified and conditioned for output.

Common Materials

Aluminum alloy, Stainless steel, Optical glass, Electronic components

Technical Parameters

Parameter	Typical range	Notes & selection driver
Supply Voltage	5 ±5% V DC	Typical for TTL interfaces
Output Signal	1Vpp	Sinusoidal for interpolation
Resolution	0.001–0.1 mm	Depends on scale pitch
Accuracy	±5–±20 µm	Including scale errors
Operating Temperature	-10–70 °C	Extended range on request
Storage Temperature	-20–85 °C	Non-condensing
Humidity	20–80 % RH	Non-condensing
Ingress Protection	IP54–IP65	Higher IP availableIEC 60529
Vibration Resistance	10–2000 Hz	At 100 m/s²IEC 60068-2-6
Shock Resistance	1000 m/s²	Half-sine, 6 msIEC 60068-2-27
Cable Length	1–10 m	Shielded twisted pair
Weight	50–200 g	Without cable

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Light Source/LED Part
Provides illumination for optical reading of scale markings

Material: Semiconductor materials
Photodetector Array
Detects light patterns from scale and converts to electrical signals

Material: Silicon photodiodes
Signal Processing Circuit
Processes raw signals into usable position data

Material: Electronic components on PCB
Housing Part
Protects internal components and provides mounting interface

Material: Aluminum alloy or stainless steel
Connector Part
Electrical interface for power and signal transmission

Material: Plastic with metal contacts
Magnetic or Inductive Sensing Element Optional
Reads a magnetic or inductive scale where an optical head would be defeated by oil and dust.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Position Encoders

View system integration details

Position Sensor/Encoder

View system integration details

Manufacturers of Read Head/Sensor

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Frequently Asked Questions

What is the typical supply voltage for a read head?

The typical supply voltage is 5 V DC ±5% for TTL interfaces. Always verify the exact requirement for your specific model.

What output signals are available?

Output signals include TTL and 1Vpp analog. The 1Vpp signal is sinusoidal and suitable for interpolation to achieve higher resolution.

What is the resolution range?

Resolution depends on the scale pitch and typically ranges from 0.001 to 0.1 mm. Confirm the actual resolution with the manufacturer.

What environmental conditions can the read head withstand?

Operating temperature is -10 to 70 °C, storage -20 to 85 °C, humidity 20-80% RH non-condensing. Ingress protection is IP54-IP65. Verify for your application.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Atmospheric to 1.5 bar (typical), IP67/IP69K rated for environmental protection
other spec:	Vibration: 20g (10-2000 Hz), Shock: 100g (6ms), Max scanning speed: 10 m/s, Resolution: down to 1 nm (depending on encoder type)
temperature:	-20°C to +85°C (operating), -40°C to +100°C (storage)

Read Head/Sensor

Product Specifications

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