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參數(shù)資料
| 型號： | HEDR-8000 |
| 英文描述： | Reflective Optical Surface Mount Encoders(反射光表貼編碼器) |
| 中文描述： | 反射式表面貼裝編碼器（反射光表貼編碼器） |
| 文件頁數(shù)： | 2/8頁 |
| 文件大?。?/td> | 182K |
| 代理商： | HEDR-8000 |
2
V
LED
GND
V
CC
CH A
CH B
GND
SIGNAL
PROCESSING
CIRCUITRY
R
CODEWHEEL
OR
CODESTRIP
Block Diagram
The reflective surface mount
optical encoders provide two
square wave outputs in quadra-
ture for count and direction
information. These TTL
compatible outputs correspond to
the alternating reflective/non-
reflective pattern of the
codewheel or codestrip.
The HEDR-8000/8100 series
encoders can be used over a
range of codewheel and codestrip
resolutions. The HEDR-8000/
8100 reflective encoder can
operate from 2.76 to 2.95 lines
per mm (70 to 75 lines per inch).
The HEDR-8100 can be used with
a codewheel or codestrip with
150 lines per inch (5.91 lines
per mm).
Applications
The HEDR-8000/8100 series
provides two channel motion
sensing at a very low cost, making
it ideal for high volume
applications. Its small size and
surface mount capability make it
ideal for printers, copiers, card
readers, and consumer product
applications.
Theory of Operation
The HEDR-8000/8100 series
combines an emitter and a
detector in a single surface mount
SO-8 package. When used with a
codewheel or codestrip, the
reflective sensors translates
rotary or linear motion into a two
channel digital output.
As seen in the block diagram, the
HEDR-8000/8100 series has three
key parts: a single light emitting
diode (LED) light source, a
photodetector IC with a set of
uniquely configured photodiodes,
and a pair of lenses molded into
the package. The lens over the
LED focuses light onto the
codewheel or codestrip. Light is
either reflected or not reflected
back to the lens over the
photodetector IC.
As the codewheel rotates or
codestrip passes by, an alternat-
ing pattern of light and dark
corresponding to the pattern of
the codewheel falls upon the
photodiodes. This light is used to
produce internal signals A and
A
,
and B and
B
. As part of this
“push-pull” detector system, these
signals are fed through compara-
tors to produce the final outputs
for channels A and B.
Definitions
Count (N):
For rotary motion,
the number of bar and window
pairs or counts per revolution
(CPR) of the codewheel. For
linear motion, the number of bar
and window pairs per unit length
(lines per inch [LPI] or lines per
mm [LPmm]).
One Cycle (C):
360 electrical
degrees (
°
e), 1 bar and window
pair.
One Shaft Rotation:
360
mechanical degrees, N cycles
(rotary motion only).
Line Density:
The number of
reflective and non-reflective pairs
per unit length, expressed as
either lines per inch (LPI) or lines
per mm (LPmm).
Pulse Width (P):
The number of
electrical degrees that an output
is high during one cycle,
nominally 180
°
e or 1/2 a cycle.
Pulse Width Error (
P):
The
deviation in electrical degrees of
the pulse width from its ideal
value of 180
°
e.
相關PDF資料 |
PDF描述 |
|---|---|
| HEDR-8100 | Reflective Optical Surface Mount Encoders(反射光表貼編碼器) |
| HEDS-5640-E04 | Quick Assembly Two and Three Channel Optical Encoders |
| HEDS-5605-K12 | Quick Assembly Two and Three Channel Optical Encoders |
| HEDS-5605-K13 | Quick Assembly Two and Three Channel Optical Encoders |
| HEDS-5605-K14 | Quick Assembly Two and Three Channel Optical Encoders |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| HEDR-8000#2K0 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Reflective Optical Surface Mount Encoders |
| HEDR-8000#2K2 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Reflective Optical Surface Mount Encoders |
| HEDR-8000#2K3 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Reflective Optical Surface Mount Encoders |
| HEDR-8000#2K4 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Reflective Optical Surface Mount Encoders |
| HEDR-80002K | 制造商:AVAGO 制造商全稱:AVAGO TECHNOLOGIES LIMITED 功能描述:Reflective Optical Surface Mount Encoders |
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