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SFH4640

更新时间: 2024-11-15 12:26:55
品牌 Logo 应用领域
欧司朗 - OSRAM /
页数 文件大小 规格书
14页 275K
描述
Emitters and Detectors for Infrared (IR) Touchscreens

SFH4640 技术参数

是否Rohs认证: 符合生命周期:Active
包装说明:ROHS COMPLIANT PACKAGE-2Reach Compliance Code:compliant
HTS代码:8541.40.20.00风险等级:5.59
配置:SINGLE最大正向电流:0.1 A
安装特点:SURFACE MOUNT功能数量:1
最高工作温度:100 °C最低工作温度:-40 °C
光电设备类型:INFRARED LED标称输出功率:45 mW
峰值波长:950 nm最大反向电压:5 V
形状:ROUND光谱带宽:4.2e-8 m
子类别:Infrared LEDs表面贴装:YES
视角:30 degBase Number Matches:1

SFH4640 数据手册

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Emitters and Detectors for Infrared (IR) Touchscreens  
Application note  
presents a general overview of different  
technologies and their features.  
1. Introduction  
This paper will give an overview on IR-based  
touchscreen technologies with a special  
focus on infrared emitting diodes (IREDs)  
and photodetectors to be used in such  
applications. It shall help touchscreen  
designers to select suitable IR components  
for their system and provide some general  
optoelectronic guidelines.  
Touchscreens as a popular user interface  
are more and more common. Applications  
span from public information systems to  
customer self-service terminals. Thus, as a  
logical step, more and more devices today  
feature this kind of user interface, e.g. bank  
automatic teller machines (ATMs), personal  
digital assistants (PDAs), mobile phones and  
PC displays. The widespread popularity is  
actively supported by standard computer  
based operating systems, like e.g.  
Windows® 7.  
Traditionally, IR touchscreens have faced  
three criticisms: Size, cost, and ambient light  
sensitivity. The first two concerns stem from  
traditional matrix-based systems. However,  
new technology and slim packages enable a  
significant decrease in bezel height  
combined with a decrease in cost. Camera-  
based systems go even further by reducing  
significantly the number of parts at the cost  
The rapid development of CMOS imaging  
sensors and the development of high power  
infrared (IR) emitters in slim packages have  
led to a series of new optical touchscreen  
technologies. Many of them contain  
proprietary technology and solutions. Tab. 1  
of  
added  
computing  
and  
software  
Surface  
IR  
IR  
IR  
In-cell  
optical  
Feature  
Resistive Capacitive acoustic matrix- camera- projector-  
wave  
based  
based  
based  
Clarity of image  
quality  
-
+
-
o
+
-
+
o
-
++  
-
++  
++  
++  
++  
+
Resolution  
++  
++  
Cost effective for  
larger screens  
Resistance to  
vandalism  
-
++  
++  
-
-
+
+
+
++  
o
Stable calibration  
Easy to manufacture  
Retrofit possibility  
Any object can  
create a touch  
Touch accuracy  
Multitouch capability  
Ambient light  
-
+
++  
+
o
o
+
o
-
++  
+
++  
++  
+
++  
++  
+
-
++  
+
-
o
-
o
++  
++  
++  
-
o
-
+
+
+
o
o
+
++  
+
++  
+
+
+
+
+
+
-
o
-
-
insensitivity  
Sealable, resistance  
to dust  
+
s
+
-
+
++  
+
l
o
s
Main market  
m
m
m/l  
m/l  
Table 1: Summary of touchscreen technologies and their features.  
(++: excellent, +: good, o: ok, -: does not perform well/does not have this function,  
screen size: s: small (2” – 10”), m: medium (12” – 30”), l: large (>32”))  
August 13, 2010  
page 1 of 14  

SFH4640 替代型号

型号 品牌 替代类型 描述 数据表
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