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High Precision Grating Ruler Reading Head Achieve Effective Resolution Of 20 nm

High Precision Grating Ruler Reading Head Achieve Effective Resolution Of 20 nm

  • High Precision Grating Ruler Reading Head Achieve Effective Resolution Of 20 nm
  • High Precision Grating Ruler Reading Head Achieve Effective Resolution Of 20 nm
  • High Precision Grating Ruler Reading Head Achieve Effective Resolution Of 20 nm
  • High Precision Grating Ruler Reading Head Achieve Effective Resolution Of 20 nm
  • High Precision Grating Ruler Reading Head Achieve Effective Resolution Of 20 nm
High Precision Grating Ruler Reading Head Achieve Effective Resolution Of 20 nm
Product Details:
Place of Origin: Dongguan
Brand Name: UNIMETRO
Model Number: RU2
Payment & Shipping Terms:
Minimum Order Quantity: 1
Price: Discussible
Packaging Details: box
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Detailed Product Description
Size: L36mm*W16.4mm*H14.3mm 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
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High Precision Grating ruler reading head achieve effective resolution of 20 nm
 
Product Description                                                                         

RU2 Series Grating ruler reading head

● RU2 grating ruler reading head is designed to provide feedback for high precision linear measurement. It adopts UNIMETRO' s most advanced single field scanning technology, advanced automatic gain and automatic deviation correction technology. It can read 20 MHI grating ruler with high precision and anti-pollution performance. It is suitable for high performance and high reliability applications requiring closed-loop and speed control, such as high precision machine tools and automatic deviation correction technology, High-speed automation equipment, etc.

 

High Precision Grating Ruler Reading Head Achieve Effective Resolution Of 20 nm 0
 
 
 
 
Reference Data                                                                                                                   

High Precision Single Field Scanning Series Reader

● RU2 reading head adopts UNIMETRO 's most advanced large area single field scanning technology, automatic gain control technology and automatic deviation correction technology, which can effectively reduce the impact of pollution. The built-in real-speed ADC subdivision of reading head can provide greater bandwidth, and more effectively reduce subdivision noise and subdivision error.It can achieve an effective resolution of 20 nm under the condition of low position noise and smooth speed control, with built-in REF reference origin and limit output, and provides a standard differential TTL digital incremental interface. The multi-color LED is integrated on the reading head, which can indicate signal strength and facilitate installation.

 

 
 
 
Environmental requirements
 
working temperature
-10℃ ~ +70℃
Working humidity
RH<95%
(Non condensation)
Seal up
IP40
Storage temperature
-20℃ ~ +85℃
Storage humidity
RH<95%
(Non condensation)

 

 

 

Main Features                                                                                                                    

◆ Maximum resolution 50 nm.
◆ Strong anti-pollution ability: Large area single field scanning technology, more than 100 grid lines scanning at the same time, effectively reduce the impact of other pollutants such as dust.
◆ High bandwidth, low subdivision error: built-in high-speed ADC and filter circuit, provide higher bandwidth, higher resolution, higher dynamic response, lower subdivision error.
◆ Automatic benefit control, automatic deviation correction: advanced automatic gain control, automatic deviation correction circuit and algorithm, to provide more stable signal output. Installation is also more convenient.
◆ Multicolor indicator indicates signal strength and installation status.

◆ SinCos 1Vpp, Differential TTL Signal Interface.

◆ Built-in REF origin and limit signal.

 

Specifications
 
Dimension
L:36mm * W16.4mm * H14.3
Calibration distance
20um
Weight
Reading Head:15g Cable:35g/m
Power
5V±10% 150mA
Output signal
Differential TTL or SinCos 1Vpp, origin, limit, reading head ready
Connector
D-sub 15 Pin Male
Accuracy grade
±5 um(RUS Grating ruler)
Resolution
Differential TTL 5um,1um,0.5um,0.2um,100nm,50nm,20nm
(SinCos 1Vpp)20um
Electronic subdivision error
<40nm
Maximum speed
12m/s(Relating to resolution and minimum clock frequency of counter)
Maximum acceleration
35G
Reference origin
Magnetic switch at bottom of reading head
Limit switch
Magnetic switch at bottom of reading head
One-way Repetition Accuracy of Reference Origin
1LSB

 

 

Excellent Anti-pollution Ability of RU2 Reading Head

Advanced Large Area Single Field Scanning Technology

RU2 reading head adopts LAMOTION advanced large area single field scanning technology. The scattered light emitted by the light source passes through the lens and adjusts to parallel beam. After filtering the surplus beam through the window on the grating, it illuminates on the grating ruler and reflects by the grating ruler to form bright and dark fringes. The grating on the window illuminates on the single field scanning sensor.

 

 
 

High Pollution Resistance of Single Field Scanning

 

 
 

Through LAIVIOTION Dalian Banyan optical test, when using RUS stainless steel grid ruler, the RU2 reading head is polluted by dust, ink and scratches similar to the figure above, the measurement accuracy is only affected by tens of nanometers, and the Lissajou figure of the signal is only affected by a little, there will be no DC deviation and unequal distortion of the amplitude. It will not cause the reading head to be unable to work.

The single-field scanning of RU2 reading head only outputs Sin+, Sin-, Cos+, Cos-signals on one sensor. Unlike four-field scanning, it requires four sensors to output signals. When the grid ruler is contaminated, the amplitude of the signal changes at the same time, which will not cause Lissajou pattern distortion.

 

 
 

Automatic Gain Control Technology                                                                              

The RU2 reading head uses the most advanced automatic gain control technology of LAMOTION Dalian Banyan Optics. When the distance between the reading head and the grating ruler changes (mostly when the reading head is adjusted and installed), or when the speed of the reading head changes, the amplitude of the signal will change. The automatic gain control technology of the RU2 reading head can keep the amplitude of these signals stable all the time and ensure the output accuracy.

Detailed Images.
 
Signal electrical parameters
Differential TTL
Signal location
2 differential signals A and B
 
Reference origin signal
1differential signals Z
Pulse width 90°
 
Signal level
RS-422(TIA/EIA-422-B)
Output high level ≥ 2.4V When the output current is 20 mA
Output low level ≤ 0.4V When the output current is 20 mA
 
Allowable load
Output current ≤ 30 mA
Impedance 120ohm Between each pair of differential signals
SinCos 1Vpp
Signal location
Sin signal and Cos signal
 
Reference origin signal
1differential signals REF
Pulse width -18°~ -108°
 
 
Signal level
Signal level M 0.6V~1.2V Typical value 1Vpp
Symmetry deviation | P-N | /2M ≤ 0.065
Phase angle | φ1+φ2 | /2 90°±1°Electron angle
 
Allowable load
Output current ≤ 10 mA
Impedance 120ohm Between each pair of differential signals
Limit
Signal type
Drain open circuit output
 
Allowable load
Input level 3.3V~24V
Input current ≤20mA
Reader ready
Signal type
Drain open circuit output
 
Allowable load
Input level 3.3V~24V
Input current ≤20mA 

 

 

 

   

PS:In order to ensure the phase of the origin signal, it may be necessary to adjust the origin magnet.

 

 

The Relation between Speed and Resolution and Frequency

 

Output resolution
 
 
1um
0.5um
0.2um
0.1um
50nm
 
 
Counter
Minimum clock frequency
10M
12m/s
12m/s
8m/s
4m/s
2m/s
 
 
Maximum speed
5M
12m/s
10m/s
4m/s
2m/s
1m/s
2.5M
10m/s
5m/s
2m/s
1m/s
0.5m/s
1M
4m/s
2m/s
0.8m/s
0.4m/s
0.2

 

 

 

Signal Connection                                                                                                       
 
Reading Head Interface Line Sequence
Pin number
Function
Pin number
Function
PIN 1
Differential TTL A+ (Digital output)
SinCos 1Vpp Sin+ (Analog output)
PIN 9
Differential TTL A- (Digital output)
SinCos 1Vpp Sin- (Analog output)
PIN 2
Differential TTL B+ (Digital output)
SinCos 1Vpp Sin+ (Analog output)
PIN 10
Differential TTL B- (Digital output)
SinCos 1Vpp Sin- (Analog output)
PIN 3
Differential TTL Z+ (Digital output)
SinCos 1Vpp Ref+ (Analog output)
PIN 11
Differential TTL Z- (Digital output)
SinCos 1Vpp Ref- (Analog output))
PIN 4
Empty
PIN 12
Empty
PIN 5
Reader ready
PIN 13
Empty
PIN 6
Limit
PIN 14
+5V
PIN 7
+5V
PIN 15
0V
PIN 8
0V,Inner shielding (need to be connected to 0V with PIN15 to enhance anti-jamming performance)
 
 

 

 

 

                                                                     

                                                                      D-SUB 15 Male head

 

 

Recommended Differential TTL, SinCos 1 Vpp Signal Connection

 

 
 

The recommended reader ready,limit signal connection

 
 
 
 
Signal Meaning                                                                                                              
 

The meaning of reader ready and limit signal can be judged concretely by referring to the system indicator.

 

Reader ready, limit signal state meaning
Signal Condition
Reader ready
Limit
Drain open
Signal line disconnection
Signal line disconnection
Low Intensity of Reading Head Signal
Detection Limit
Reading head overspeed
 
Abnormal power supply of reading head
 
Drain closure
Reading head works normally
Reading head works normally

 

 

 

System Indicator                                                                                                              

The RU2 reading head has built-in multi-color indicator light, which can indicate the current signal, origin and limit status, and can assist the installation and adjustment of the reading head.

 

Reader Head Indicator Signal Intensity
The intensity of the signal increases gradually with the change of the color of the indicator as follows
Red light on
Signal Intensity < 30%,Reading head not working properly
Yellow light on
Signal Intensity < 50%, Reading head working properly
However, the error of electronic subdivision may be larger, and the output of analog signal may be less than 1Vpp.
Green light on
Signal Intensity < 80%,Reading head working properly
Blue light on
Signal Intensity ≥ 80%,Reading head working properly

 

 

Other Functions of Reading Head Indicator
Red lights on for 0.5 seconds
Origin position detected
Red light flashes twice
Origin phase error, need to adjust the phase
The speed of origin detection is too fast.
 

Contact Details
Unimetro Precision Machinery Co., Ltd

Contact Person: Mr. Henry Wong

Tel: +8615622339151

Send your inquiry directly to us (0 / 3000)

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