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Grating Ruler Reading Head with 20nm Effective Resolution / High-Precision Optical Encoder

Basic Information

Place of Origin:	Dongguan
Brand Name:	UNIMETRO
Model Number:	RU2

Minimum Order Quantity:	1
Price:	Discussible
Packaging Details:	box

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Detail Information

Size:	L36mmW16.4mmH14.3mm	Pitch:	20um
Weight:	Reading Head:15g,Cable:35g/m	Signal:	Differential TTL Or SinCos 1Vpp
Accuracy:	+-5um	Resolution:	Differential TTL 5um,1um,0.5um,0.2um,100nm,50nm,20nm
Electron Subdivision Error:	＜40nm	Maximum Speed:	12m/s(It Is Related To The Resolution And The Minimum Clock Frequency Of The Counter)
Maximum Acceleration:	35G	Refer To The Unidirectional Repeating Precision At The Origin:	1LSB
Highlight:	linear digital scale , optical linear encoder

Product Description

RU2 Series Grating Ruler Reading Head

High-precision grating ruler reading head designed to provide feedback for linear measurement with 20nm effective resolution. Utilizes advanced single field scanning technology with automatic gain and deviation correction for superior performance in high-precision applications.

Advanced Scanning Technology

Single Field Scanning with High Pollution Resistance

The RU2 reading head employs LAMOTION's advanced large area single field scanning technology. Parallel beam illumination and single field scanning sensor provide exceptional performance even in contaminated environments.

Pollution Resistance

When using RUS stainless steel grid ruler, the RU2 reading head maintains measurement accuracy within tens of nanometers even when contaminated by dust, ink, and scratches.

Technical Specifications

Physical Dimensions

L: 36mm × W: 16.4mm × H: 14.3mm

Weight: Reading Head: 15g, Cable: 35g/m

Performance

Resolution: 20nm (SinCos 1Vpp)

Accuracy: ±5μm (RUS Grating ruler)

Maximum Speed: 12m/s

Electrical

Power: 5V±10% 150mA

Connector: D-sub 15 Pin Male

Output: Differential TTL or SinCos 1Vpp

Environmental Requirements

Parameter	Specification
Working Temperature	-10℃ ~ +70℃
Working Humidity	RH < 95% (Non condensation)
Sealing	IP40
Storage Temperature	-20℃ ~ +85℃
Storage Humidity	RH < 95% (Non condensation)

Key Features

Maximum resolution of 50nm with strong anti-pollution capability
Large area single field scanning technology scanning over 100 grid lines simultaneously
High bandwidth with low subdivision error through built-in high-speed ADC
Advanced automatic gain control and automatic deviation correction
Multicolor indicator for signal strength and installation status
Built-in REF origin and limit signals
SinCos 1Vpp and Differential TTL signal interfaces

Signal Parameters

Differential TTL Output

Parameter	Specification
Signal Location	2 differential signals A and B
Reference Origin	1 differential signal Z
Signal Level	RS-422 (TIA/EIA-422-B)
Output High Level	≥ 2.4V @ 20mA output current
Output Low Level	≤ 0.4V @ 20mA output current

SinCos 1Vpp Output

Parameter	Specification
Signal Location	Sin signal and Cos signal
Reference Origin	1 differential signal REF
Signal Level	0.6V~1.2V (Typical 1Vpp)
Phase Angle	90°±1° Electron angle

Speed vs Resolution

Output Resolution	Counter Min Clock Frequency	Maximum Speed
1μm	10M	12m/s
0.5μm	12M	10m/s
0.2μm	12M	4m/s
0.1μm	8M	2m/s
50nm	4M	1m/s

Connection Interface

Pin Number	Function	Pin Number	Function
PIN 1	Differential TTL A+ / SinCos 1Vpp Sin+	PIN 9	Differential TTL A- / SinCos 1Vpp Sin-
PIN 2	Differential TTL B+ / SinCos 1Vpp Cos+	PIN 10	Differential TTL B- / SinCos 1Vpp Cos-
PIN 3	Differential TTL Z+ / SinCos 1Vpp Ref+	PIN 11	Differential TTL Z- / SinCos 1Vpp Ref-
PIN 5	Reader ready	PIN 14	+5V
PIN 6	Limit	PIN 15	0V
PIN 7	+5V	PIN 8	0V, Inner shielding

System Indicators

Multicolor indicator light provides real-time status of signal, origin, and limit conditions for easy installation and adjustment.

Indicator Meanings

Indicator	Meaning
Red lights on for 0.5 seconds	Origin position detected
Red light flashes twice	Origin phase error or speed too fast

Tag:

Grating Ruler Reading Head with 20nm Effective Resolution / High-Precision Optical Encoder

linear digital scale

optical linear encoder

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optical linear encoder,

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