Illuminated Switches

Illuminated
Switches
Product Training Module
Introduction
Purpose
ƒ To “illuminate” the customer regarding illuminated switches and their functions,
and to display the wide variety of illuminated switches that NKK offers
Objectives
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Introduce the various types of illumination
Describe how isolated lamp terminals offer more flexibility to the customer
Explain how resistors are used with illuminated switches
Present the various types of illuminated actuations
Discuss applications by product grouping
Present the UB2 alternating legends
Description of custom legend capabilities
Types of Illumination
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Isolated Circuits
from External Source
All of NKK’s illuminated switches
come with isolated circuits for the
lamps.
and a
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external source. This source will
send the current that illuminates
the lamp.
The source current will depend
upon the lamp specifications.
Isolated Circuit Wired in
Line with Switch Actuation
In this example, a resistor is wired
to the positive lamp terminal from
the “Normally Open” switch terminal.
As a result, when the switch is
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terminal to the “Normally Open”
terminal, the lamp will illuminate.
The resistor is required to properly
power the lamp.
LED Circuit
The illumination is created by the LED which has the
properties of a diode (Anode “+” and Cathode “–”).
Once the Forward Voltage (VF) and Current (IF) is
achieved, the LED will illuminate.
If the voltage is reversed and exceeds the Reversed
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Voltage (VR) the LED can be damaged.
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The ballast resistor (R) is used to create the proper
voltage and current through the circuit. An alternative
to the ballast resistor is a constant current source
circuit.
The LED is generally used in DC applications. If an
AC circuit is to be used, a rectifier circuit along the
ballast resistor is required to generate the appropriate
DC voltage.
Ballast Resistor Calculation
The ballast resistor value is calculated by the formula
shown here.
As an example:
Source Voltage = 5.0V
Forward Voltage = 1.9V (set by LED)
Forward Current = 20mA (set by LED)
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The resultant ballast resistor =are155Ω
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Additionally, the power rating of this ballast resistor
must be considered.
• With a forward current of 20mA and the voltage
across the ballast resistor (5.0V –1.9V) = 3.1V
• Power across is then calculated:
3.1V x 20mA = 0.062W
• For safety purposes, typical power rating of 2X the
calculated value is selected
• The resulting power rating = 0.125W (1/4W resistor)
Ballast Resistor Calculation
for LED
Forward voltages of the LED are
different for each LED and color.
In switches where bicolor or RGB
LEDs are used, different ballast
resistor values may be required for
each LED.
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The current profile of an LED is that
it varies with temperature, so the
value of the ballast resistors should
be calculated at the appropriate
operating temperature.
This can be calculated with the current
reduction rate information supplied.
LED Colors & Chromaticity
LED Illuminated switches are available in:
ƒ Single Color: Red, Green, Amber, Blue,
White (see “White” note below)
ƒ Bicolor: Red/Green (produces Amber
when both are illuminated)
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ƒ RGB: Red/Green/Blue; theoretically, all
colors can be created by combining these,
except for Black
ƒ White: Blue LED with Yellow fluorescent
(analog White)
Generated by RGB (digital White)
LED colors are shown in the Chromaticity Graph
by their respective X-Y coordinates.
Illuminated Pushbuttons
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FP01 Series
KP01 Series
HB2 Series
GB Series
Illuminated Pushbuttons
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LB Series
Panel Seal
KB Series
LB Series
HB Series
Illuminated Pushbuttons
LP Series
YB2 Series
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UB Series
UB2 Series
YB Series
Illuminated Tactiles
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JB Series
JF Series
JL Series
Illuminated Toggles
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B Series
TL Series
G Series
M2100 Series
Illuminated Rockers
& Paddles
GW Series
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CWSB Series
M2100 Series
MLW Series
CWSC Series
LW Series
Illuminated Slides
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SS Series
MS Series
Ultra-Miniature
& Subminiature
ƒ GB Pushbuttons
ƒ B & G Toggles
ƒ GW Rockers
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Applications: Preamplifiers, Recording Mixers,
Audio Converters, Microphones, Wireless Receivers
Contactless Pushbutton
FP01 Pushbuttons
Features:
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Photo Interrupter
3 Million Operations Minimum
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Leads Available
Applications:
Gaming
Vending Machines
Equipment Exposed to Corrosive Gases
Automotive Repair Equipment
X-Ray & MRI machines
Audio/Video
HB2 & KP Pushbuttons
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Applications:
Broadcast Equipment
Recording Mixers
Audio-Visual Control Consoles
Patient Monitors
Autoclaving Equipment
Basic Pushbuttons
HB, KB & LB Pushbuttons
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Applications:
Sheet Counters
Rinsing Systems
Control Panels
Weight Scales
X-Ray Meters
Illuminated
Tactile Switches
JB, JF & JL Tactiles
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Applications:
RF Monitors
Printing Presses
Score Boards
Portable Lighting Units
In-Store Demo
Displays
Low Profile
Illuminated Pushbuttons
LP, UB & UB2 Pushbuttons
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Applications:
Patient Analyzers
A/V Wall Mount Controls
Photo Equipment
Cable Modems
Robotics
LED Tipped Switches
M21 Paddles, Rockers & Toggles
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Applications:
Emergency Vehicles
Textile Printers
Model Train Control Panels
Avionic Electrical Control Systems
Dashboard Controls
Illuminated Rockers
CWSB, CWSC, MLW & LW Rockers
Applications:
Telecom Cooling Modules
ln-Car Video Recorders
Transilluminators
Operating Table Controls
CRT Monitors
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Illuminated Slides
MS & SS Slides
Applications:
RC Controls
Theater Controls
Laser Trackers
Diagnostic Equipment
Surveillance Equipment
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Alternating Legends
UB2 Pushbuttons
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Custom Legend
Capabilities
Methods for All Applications
Laser Etching
For highest durability on many different cap designs and sizes; legend may
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Pad Printing
For highest print quality and excellent durability on most surfaces
Screen Printing
For very competitive, high quality printing on flat surfaces
Product Overview
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