Datasheet

sensors
Optical Encoder System
EOI R007
highly accurate and small
ELESTA introduced a new
optical, 3-channel encoder
system. This system meets
the growing demand for
miniaturization of micromechanical
drives.
Additionally the system
offers higher precision
in controlling motor
speed and position.
ELESTA sensors
Elesta selected the reflective mode of operation for this
unique design. Light source and photo detector are mounted in the same plane facing the code wheel. The unique
design of the code wheel is such that the complete surface of the wheel is reflective. This ensures that nearly all of
the incoming light, from the light source, is reflected on the
light sensor. This patented feature resulted in an encoder
of compact design, with extremely low power consumption,
high resolution and precise output signals. The flexibility of
this encoder system allows it to be integrated into a variety
of housings of systems and motors with ease.
Efficient use of light
energy
The uniquely shaped reflective surface of the encoder wheel reflects
and focuses light emitted by the light
source on the light sensor.
code wheel
light source
Extremely high accuracy
High resolution
The precision of the code wheel, the
focusing of the light beam and the use
of a CMOS control circuit achieved a
high slew rate and very tight signal
tolerances. The specification below
is based on a code wheel with 128
reflectors and achieved an angular
tolerance of less than ± 0.14°. This
proves that the design of miniaturized
precise angle sensors is possible and
efficient.
The unique design of the code wheel
enables the ELESTA system to
achieve higher signal selectivity than
comparable reflective systems. This
lies in the fact that the light efficiency of the ELESTA design is a factor
two better than most of the comparable systems. The high precision of
the output signals allows the system
to retain its accuracy after 2-fold and
4-fold interpolation.
light sensor
More than 90% of light emitted by the
light source arrives at the light sensor for signal generation. This allows
the implementation of low level light
sources, which in turn drastically reduces the power consumption of the
entire system. The ELESTA encoder
system is well suited for off-grid systems and mobile devices.
Reliability
Thanks to the patented sensing system position, tolerances between
code wheel and sensors have little or
no influence on the accuracy of the
sensor output signals. This is an advantage over most other comparable
systems and improved the reliability
of the ELESTA system as a whole.
Extreme environmental conditions
have minimal affects on the signal
quality. Coupled with the feature of
individual design options, easy integration with customer specific products and the miniaturized footprint
this encoder is ideally suited for high
reliability applications.
Modular system
The accuracy of outputs are highly
immune to the positional tolerance
between code wheel and sensor. This
allows ELESTA to provide an encoder
as a modular system in kit form. Customers have the option to integrate
the sensor and code wheel kit in an
existing housing, motor or system. Alternatively customers may integrate
the encoder system as a universal
encoder in a preferred housing.
Accessories allow customers the capability to adapt the universal encoder to their system.
Customized solutions
ELESTA has the capability to develop
customer specific solutions and to
adapt the encoder design to meet
customer application requirements.
Datasheet
EOIR007 C0128 DSET SA CMOS FC1
Dimensions and Pin Configuration
-- Incremental optical encoder
-- Unique code wheel design
-- High precision reflective system
-- Low current consumption
-- Easy assembly
-- Very compact mounting form
-- High immunity to positional tolerance
between code wheel and sensor
2.7
Rigid flex
(flexible part)
0.1
Rigid flex
(rigid part)
Mechanical Specifications
Signal Diagram
Operating temperature
Storage temperature
Relative humidity
(without condensation)
Shock stability
(EN 60068-2-27)
Vibration resistance
(EN 60068-2-6)
Recommended connector: 0.5mm
ZIF/LIF (thickness 0.3mm)
CW
T4
T3
T2
T1
Direction
Switching
CCW
T1
T2
T3
T4
A
CW
CCW
B
a2
Z
1/Rev
Index Pulse
-20°C to 85°C
-20°C to 85°C
85%
half sin,
30g, 6ms
5Hz-120Hz
Amp. 1mm, 5min
0.3
3.5
*valid for typical distance of 0.3mm between code wheel
and sensor
Environmental Specifications
1) NC
2) VSS
3) Z
4) B
5) A
6) VDD
8.9
0.3
Detailed dimensions on request
4.4mm
1.1mm
128
1.5mm
max. ±0.2mm
0.2mm...1.2mm
Ø 1.5
Ø 4.4
4
82.8
(after calibration)
Code wheel diameter
Code wheel thickness
Resolution (code wheel lines)
For shaft diameter
X, Y position tolerances Distance code wheel/sensor
128 Lines
0.35
0
0.5
1
1.5
2
2.5
3
3.5
for Shaft Diameter Ø1.5
Electrical Specifications
Supply voltage
3V...6V
Supply current*
2mA...6mA
Output short circuit current max. 30mA
Output drive current (at 4.5V)
typ. 5mA
Speed24‘000RPM
Frequency
typ. 1‘000kHz
Signal rise/fall time (RL=1kΩ, CL=47pF)typ. 300ns
3 channels
A, B, Z
Signal output
CMOS/TTL
Duty cycle for A and B
50% ±5%
Phase between A and B
90°e ±5°e
Burst (EN-61000-4-4)
±1kV
ESD (EN-61000-4-2)
±4kV / ±8kV
Isolation values
on request
1 Area (Index)
Rigid flex
(rigid part)
Ø4.4
(3.05 to 4.05)
0.2 to 1.2
Codewheel
1.75
2 1.1
6.
Ø
4
Features
Output Circuit
1/Rev
Index Pulse
Duty =
W
C
C
IN
OUT
In preparation
CW
GND
Product Key
EOIR007 C0128 DSET SA CMOS FC1
Connection
Signal output
Pulse multiplication factor 1
Single-Turn
Set encoder/code wheel
Number of codelines
Series
a1
a1 + a2
x 100%
Rotation Direction Identification
VDD
Tests and Regulations
a1
CMOS-Inverter
CW - Clockwise
CCW - Counterclockwise
Options
Accessories
In preparation
In preparation
Phone: +41 (0)81 303 54 00
Fax: +41 (0)81 303 54 01
E-Mail: [email protected]
Web: www.elesta-gmbh.com
ELESTA GmbH
Heuteilstrasse 18
CH-7310 Bad Ragaz
Switzerland
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