Reading Head for Linear Encoders | Specifications & Verification

Product Specifications

Technical details and manufacturing context for Reading Head

Definition

A reading head is the critical sensing component in an encoder or linear scale system. It detects position markings on a scale—such as optical gratings or magnetic patterns—and converts them into electrical signals that represent precise linear position. This component is essential for machine tools, measuring equipment, and automation systems that require accurate feedback for motion control.

The reading head operates in close proximity to the scale, typically without physical contact. For optical systems, it contains a light source (LED or laser) and photodetectors; for magnetic systems, it uses magnetic sensors. As the head moves along the scale, it senses periodic patterns and generates sinusoidal or digital signals. These signals are processed by downstream electronics to determine exact position with high resolution.

Typical specifications for reading heads include resolution from 0.1 to 5 µm, accuracy grades from ±3 to ±10 µm (per ISO 230-2), and measuring lengths from 50 to 3000 mm (custom lengths up to 30 m available). Output signals are TTL or HTL, differential or single-ended. Supply voltage is 5 V DC ±5%, with current consumption up to 100 mA (without load). Operating temperature ranges from 0 to 50 °C (storage -20 to +70 °C). Protection class ranges from IP54 to IP67 (per IEC 60529). Vibration resistance is up to 300 m/s² at 55 Hz on 3 axes (per IEC 60068-2-6), and shock resistance up to 1000 m/s² (half-sine, 6 ms, per IEC 60068-2-27). Cable lengths from 1 to 20 m (shielded twisted pair) and weight from 0.1 to 0.5 kg are typical.

Materials commonly used include aluminum alloy for the housing, optical glass for optical components, and silicon photodetectors. These specifications are reference ranges; actual values must be verified with the manufacturer for the specific model and application. Always confirm compliance with relevant standards and installation requirements.

Working Principle

The reading head contains a light source and photodetectors for optical systems, or magnetic sensors for magnetic systems. As it moves along the scale, it detects periodic patterns and generates sinusoidal or digital signals. These signals are processed to determine exact position with high resolution. The head operates without physical contact, reducing wear and enabling high-speed measurement.

Common Materials

Aluminum alloy, Optical glass, Silicon photodetectors

Technical Parameters

Parameter	Typical range	Notes & selection driver
Resolution	0.1–5 µm	Higher resolution for precision applications
Accuracy Grade	±3–±10 µm	Depends on scale length and installationISO 230-2
Measuring Length	50–3000 mm	Custom lengths up to 30 m available
Output Signal	TTL/HTL	Differential or single-ended
Supply Voltage	5 ±5% V DC	Reverse polarity protected
Current Consumption	≤100 mA	Without load
Operating Temperature	0–50 °C	Storage: -20 to +70 °C
Protection Class	IP54–IP67	Higher IP for harsh environmentsIEC 60529
Vibration Resistance	≤300 m/s²	At 55 Hz, 3 axesIEC 60068-2-6
Shock Resistance	≤1000 m/s²	Half-sine, 6 msIEC 60068-2-27
Cable Length	1–20 m	Shielded twisted pair
Weight	0.1–0.5 kg	Depends on cable and connector

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
Emits light for optical scale reading

Material: LED/Laser diode
Photodetector Array
Detects light patterns from scale

Material: Silicon
Housing Part
Protects internal components and provides mounting

Material: Aluminum alloy
Magnetic Sensor Optional
Reads a magnetic scale where oil, dust or coolant would defeat an optical head.

Applied To / Applications

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

Encoder / Linear Scale

View system integration details

Manufacturers of Reading Head

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Frequently Asked Questions

What is the typical resolution range for a reading head?

The resolution range is typically 0.1 to 5 µm, depending on the model and application. Higher resolution is available for precision applications, but the exact value must be confirmed with the manufacturer.

What output signals are available?

Output signals are TTL or HTL, and can be differential or single-ended. The choice depends on the controller interface and cable length requirements.

What is the operating temperature range?

The operating temperature range is 0 to 50 °C, with storage from -20 to +70 °C. Ensure the environment stays within these limits to avoid performance degradation.

How do I verify the accuracy grade?

The accuracy grade is specified as ±3 to ±10 µm per ISO 230-2. Verify the actual grade for your specific model with the manufacturer, as it depends on scale length and installation.

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
other spec:	Vibration tolerance: 10-55 Hz, 0.15 mm amplitude
temperature:	-10°C to +70°C

Reading Head

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