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Membrane Switch and Keypad Backlighting made easy with Lumitex

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Membrane Switch and Keypad Backlighting made easy with Lumitex Powered By Docstoc
					Differentiate your products with Fiber Optic Back-Lighting
                  Membrane Switch and Keypad Lighting made easy!
Benefits:                                                      Cable/Source Placement & Routing
        Uniform lighting over a large area                             Our Applications Engineering team is very
        Low power, one LED for entire panel                   creative with routing cables and sources around
        Long life, essentially no fading                      mechanical constraints.
        Low cost, no inverter or complex drivers
        No EMI/RFI                                            Secondary Enhancements:
        Durable, Reliable (tested to 5MM cycles)                  1.   Dbl sided adhesive with release liner can be
        Thin (0.013”); superior tactile response                       mounted on the top or bottom of the panel
        Design flexibility, easily customizable                   2.   Die-cutting;
                                                                           a. Holes in the reflector only allow an
How Fiber Optic Backlighting Works:                                             indicator LED to show through the panel.
                                                                           b. Holes through the entire panel allow for
                                                                                routing around mechanical elements.
                                                                                Note that light will not transmit in the
                                                                                fiber downstream of the hole.
Woven Fiber                 UniGlo Fiber                                   c. Shapes and cutouts
                                                                   3.   Heat Formed Cable can allow for better routing
          Sheets of fiber backlighting material are made                around mechanical constraints. This may also
from either Woven or UniGlo fiber. UniGlo is generally                  be accomplished with mechanical elements in
preferred for switches due to its thinness (0.013”).                    the end device (the fiber tail is flexible).
          These fiber sheets are constructed to a specific         4.   Randomized Cables; LED dis-uniformities are
length and width. The cable (tail) end is bundled into a                not transmitted to the panel. Fibers that are
ferrule and mated to a light source. Typically one layer                adjacent in the panel are specifically ordered so
of fiber is used in conjunction with a backreflector and, if            as not to be adjacent next to the LED. This may
desired, double sided adhesive can be mounted on the                    also be accomplished by proper overlay
top or bottom.                                                          diffusion or by reducing the number of fibers
                                                                        attached to one LED.
                                                                   5.   Opacify the End and/or sides; prevents stray
                                                                        light from affecting the look of the product.
                                                                        This may also be accomplished by a bezel or
                                                                        selective printing on the overlay.
                                                                   6.   Circuit elements printed on Back Reflector; eg
                                                                        conductive pads for use with a Rubber Keypad.
                                                                   7.   Cable Coverings; such as heat shrink or flex
                                                                        wrap to protect the fiber optic cable.
                                                                   8.   Multiple panels connected to one LED.
                                                                   9.   Multiple colors on one panel; through multiple
                                                                        LED’s or a Tri-Color LED.

                                                               Prototyping:
                                                                       Typical Lead Time; 4-6 weeks. Faster
                                                                        turnaround can be accommodated if necessary.
                                                                       Typical Cost; $1-2k per lot
                                                                       Ask for a free non-custom sample that is close
                                                                        to your application.
Light Sources:
        LED colors; Green, Blue, White, Amber, Red.
        5mm round lamp type LED uses ST-250 clip.
                                                               Contact Us:
                                                               Lumitex, Inc., 8443 Dow Circle, Strongsville, OH 44136
         Supports up to 400 fibers (4” of panel width)
                                                               1-800-WOW-LITE (969-5483)
        3mm round lamp type LED uses ST-160.
                                                               info@lumitex.com www.lumitex.com
         Supports up to 135 fibers (1.35” of panel width)
                                                               Poly-Optical (West Coast Sales Office) 949-250-8557
Comparison with Other Technologies
Factor           Fiber Optic Backlighting            EL (Electroluminescent)     Discreet SMT LED’s
Thickness        0.013” (0.33mm)                     0.015”                      Bumps up to 0.040”
EMI/RFI          None                                Yes                         None
Tooling          Low (typically < $1k)               Moderate ($5k)              Setup charge
Life             100k hrs (depending on LED)         2k hours to half            100k hrs
                                                     brightness
Power Source     2-4 vdc, 5-30mA (one LED)           Inverter required           2-4 vdc, 5-30mA per LED
Moisture         No Effect                           Sensitive                   No Effect
Reliability      Tested to millions of actuations    Lamp breaks down with       LED array has multiple points of
                                                     multiple actuations         potential failure
Segments vs.     Lights large area economically      Larger areas may become     Can light individual points only
Large Area                                           cost prohibitive
Cost             Moderate; function of LEDs,         Medium for panel            Multiple LED’s increase cost for larger
                 size and configuration              Inverter is expensive       areas


Frequently Asked Questions:
Do we have mechanical life testing? (Over 5 million actuations).
Do you have force displacement testing? (Adds only .8 to 2.1
         additional detent pressure for metal or plastic domes).
What type of LED is used with the fiberoptic panels? (5mm or
         3mm Round Lamp style through hole mount)
Where is the LED usually mounted? (on a convenient spot on the
         existing circuit board, fiber optic cable can be routed to it)
Can SMT LEDs or discrete LEDs shine through the transparent fibers?
          (a hole can be cut through the reflector, but not through the fiber)
How tight can you make the perform bend? (0.25” diameter or larger is
         ideal, however, smaller bends can be done with some loss of light)
Can you eliminate the brightness at the distal edge of the fiberoptic
         backlight? (yes, by opacifying the distal end)
What happens when I have a light source on each end of the panel?
         (typically, the effective light output is doubled)
Can you die cut through the entire panel? If so, what happens? (yes, this
         allows for routing around mechanical elements, however, light
         will not travel in the fibers downstream of the cut out)
Can you die cut the fiberoptic panel into different shapes or in a radius?
         (yes on the distal edge, not on the proximal edge)
Can you increase the brightness? (there are many ways to increase brightness,
         there may be tradeoffs with cost and/or other mechanical features)
What is the standard operating temperature range? (-40 deg C to +80 deg C)
Do you have selected membrane switch companies that you partner with?
         (yes, contact your sales engineer for advice)

Where Fiber Optic Backlighting is a Good Fit:
Where larger areas need to be lit with less power.
Where the life of the product is important.
Where power consumption is critical.
Where moisture, heat or humidity could be factor.
Where no EMI/RFI can be allowed.

Sales Engineers:
Tom Fisher; East Coast, Southern US & Europe, tfisher@lumitex.com , 440-243-8401 x105
Walt Schulz; Midwest US & Canada, wschulz@lumitex.com , 440-243-8401 x109
Heidi DaSilva; Western US, heidi@poly-optical.com , 949-250-8557 x224

				
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