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PDF SMD-01 Data sheet ( Hoja de datos )
| Número de pieza | SMD-01 | |
| Descripción | Optical Encoder Head | |
| Fabricantes | NPC | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SMD-01 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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SMD-01
Optical Encoder Head
OVERVIEW
The SMD-01 is a high-precision optical encoder that employs a diffraction image projection method. It
incorporates an OEIC (Opto-Electric Integrated Circuit) and LED light source in a single package. Light
emitted from the LED is projected onto a scale, and the reflected diffraction image is focused on a photodiode.
The reflected light contains position information that is recovered to detect the relative movement between the
SMD-01 and the scale. In addition, the light receiver employs a photodiode array to reduce the degradation in
phase characteristics due to dependency on mounting position error, making the SMD-01 easier to mount.
FEATURES
I Package: Miniature clear-mold package
(5.3 × 4.3 × 1.68mm)
I Output signal period: 20µm
(Uses 20µm period A-phase/B-phase signals to
achieve 5µm resolution)
I Optimized OEIC and optics design for easy
mounting alignment
I LED and OEIC fabricated in a single package
I Adjustable LED brightness using external inputs
I Analog (sine wave) output
I Supply voltage: 3.13 to 5.25V
I Current consumption: 12.2mA (typ)
PINOUT
(Top view)
SWL1 1
SWL2 2
VCC 3
NC 4
NC 5
NC 6
SWV 7
14 GND
13 NC
12 VA
11 VAB
10 VB
9 VBB
8 VREF
APPLICATIONS
I Linear motors
I Precision stages
I Sliders
I Mounting equipment
I Robots
I Angle measurement equipment
I Various encoder devices
PACKAGE DIMENSIONS
(Unit: mm)
Top view
5.3 ± 0.1
LED
Slit
Head center
OEIC
Side view 1
Gold (Au)
electrodes
Side view 2
Epoxy resin
Glass-epoxy substrate
14 − R0.15
Bottom view 0.6
SEIKO NPC CORPORATION —1
1 page  
SMD-01
FUNCTIONAL DESCRIPTION
The SMD-01 head emits 635nm center-wavelength visible light from the LED and projects the light through a slit and onto a scale having
a 20μm pitch (10μm lines/10μm spacing) grating pattern. The reflected diffraction image is focused on a photodiode array to detect the
relative movement between the head and the scale. A20μm period pseudo sine wave phase A (VA) signal corresponding to the detector
state is output, together with phase B (VB), which has 90°phase difference from VA, and inverted signals of both VA& VB (VAB, VBB).
LED Brightness Switching Function
The signal amplitude can be adjusted by adjusting the LED brightness. The LED brightness is adjusted by adjusting the LED current. The
amplitude adjustment options are shown in the following table.
SWL1
SWL2
A/B-phase analog signal amplitude
HHL
HLH
×1.0 ×1.8 ×2.6
L
L
×0
SCALE and HEAD ALIGNMENT
The encoder head optical center position is offset from the physical center of the head by 0.77mm (ΔY) in the vertical direction and 0.1mm
(ΔX) in the horizontal direction. If using a linear scale, only the offset in the scale width direction (ΔY) needs to be considered. If using a
rotary scale, the scale offset in the horizontal direction (ΔX) must also be taken into account.
Conditions of optimum optics of this product may vary due to mounting tolerance of optical elements, so thorough evaluation is needed to
set the conditions. Particularly when using small-diameter rotary scale, effect of alignment conditions on signal amplitude and phase
difference is greater than when using linear scale. Individualized alignment is recommended to obtain better product characteristics.
Scale
Roll angle
∆θr
Yaw angle
∆θy
Head-scale
alignment center
Head (SMD-01)
Gap
∆θ ∆Gap
Pitch angle
Head center
Scale width alignment center
Scale vertical offset (ΔY)
Head-scale alignment center
+SW
-SW
Reference data:
Scale
SMD-01
head alignment
Head center Scale horizontal offset (ΔX)
Parameter
Scale width (±SW)
Scale vertical offset (ΔY)
Scale horizontal offset (ΔX)
Conditions
±1 (min)
0.77
0.1
Unit
mm
mm
mm
SEIKO NPC CORPORATION - 5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet SMD-01.PDF ] | |
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