barcode reading using c#.net FIGURE 64.20 in Software

Drawer Quick Response Code in Software FIGURE 64.20

FIGURE 64.20
Quick Response Code Reader In None
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QR Generation In None
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Dimple contacts for flexible circuits.
Scanning QR-Code In None
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QR Maker In C#.NET
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The dimpled connection was adopted for the disposable ink cartridges of the inkjet printers, and huge numbers of flexible circuits are consumed as the partner of the dimpled flexible circuits (see Fig. 67.21).
Creating QR Code JIS X 0510 In .NET
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Printing QR Code JIS X 0510 In .NET Framework
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Ink nozzle Ink Cartridge Flexible circuit
Printing Quick Response Code In Visual Basic .NET
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Bar Code Creator In None
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Flexible circuit cable
EAN / UCC - 13 Generation In None
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UPCA Creation In None
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Dimpled pads
ECC200 Maker In None
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Bar Code Creator In None
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FIGURE 64.21
Draw USPS OneCode Solution Barcode In None
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UCC.EAN - 128 Printer In .NET Framework
Using Barcode maker for ASP.NET Control to generate, create USS-128 image in ASP.NET applications.
Dimple connections for ink jet printer. (Source: LexMark.)
Data Matrix Generator In VB.NET
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USS Code 128 Maker In .NET
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TERMINATION OF FLEXIBLE CIRCUITS
Reading Code-39 In None
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UCC - 12 Encoder In None
Using Barcode creation for Font Control to generate, create EAN128 image in Font applications.
FIGURE 64.22 Flat disk-shaped microbump array on flexible circuit fir area contacts. Contact metal is copper-nickle-gold at 0.5 mm pitch. (Source: Asahi Fine Technology.)
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Printing UPC A In VB.NET
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FIGURE 64.23 Column shape Cu/Ni/Au bump array on a flexible circuit substrate.
64.5.4.2 Microbump Array. Because of thin substrates, various constructions of microbump arrays have been developed on flexible substrates. A plating combination of nickel and hard gold on a copper bump provides reliable contact performances. A microbump array built on flexible circuits by a plating process enables high-density contacts with the other circuit boards. The process has a range of wide flexibility to generate various shapes of microbumps. It is possible to build more than 1,000 microbumps in 10 mm2 if 30 mm line/space circuits are available. A mushroom-head copper bump plated with hard nickel and hard gold has enough life for millions of contacts (see Fig. 64.22). 64.5.4.3 Film Connectors. High height bumps built on the flexible substrates as shown in Fig. 64.23 enable various repeatable interconnections between flexible circuits and the other devices.. A flexible circuit with a microbump array makes made a connection thinner than 0.3 mm from the surface of the other circuits. Over 100 connections could be made in 5 mm square by a microbump array. The column-shaped microbumps work as the male parts of the connection. An appropriated design of the female parts of the flexible circuits enables over 1,000 repeated connections for the high-pin-count circuits. Figure 64.24 shows the concept of a film connector made with bumped flexible circuits.The column-shaped microbump array is built on both sides of a thin, flexible substrate, and it works as the film connector between two flexible circuits. The film connector could generally be used with standard designs because it manages high-pin-count connections of flexible circuits without special constructions. Many varieties for the constructions could be possible depending on the combinations of flexible circuits and other devices.
Keypad Contacts There are several different constructions for keypads on flexible circuits. Thick-film circuits on polyester film called membrane switch could be a low-cost solution with many millions of reliable contacts. The basic mechanism of the switching is illustrated in Fig. 64.25. Generally, the membrane switches are connected through FFC connectors to the main circuit board. Polyimide-based circuits are necessary with soldering of components.
PRINTED CIRCUITS HANDBOOK
Flexible circuit Flexible Film connector Flexible circuit
FIGURE 64.24 Thin connection by film connector.
Switching key
Polyester films
Silver paste circuits
FIGURE 64.25 Membrane switch mechanisms.
Polyester Spacer
The membrane switches built on polyester film are widely used as the standard keyboard circuits of personal computers. They are also used as the switching components of touch panel boards for home appliances such as microwave ovens and office machines such as copy machines. They are also used with the touch screens of display devices.
HIGH-DENSITY FLEXIBLE CIRCUIT TERMINATION
No perfect termination technology can satisfy all requirements, especially for high-density connections with high pin counts. On the other hand, higher performances are required for the new portable electronics to complete reliable terminations in limited spaces. Accordingly, many new termination technologies with flexible circuits have been developed to satisfy many requirements. Nevertheless, it is still difficult to use one termination technology to satisfy
TERMINATION OF FLEXIBLE CIRCUITS
TABLE 64.12 New Termination Technologies for High-Density Flexible Circuits Termination density (mm pitch) 300 150 150 50 200 60 300 200
Termination technology Lead-free reflow Lead-free hot bar reflow Wire bonding Direct bonding High-density BGA for flip-chip Anisotropic conductive materials Small-pitch ZIF connectors Contact probe array
Repeatability 2 2 1 1 1 5 100 1000
Requirement for flex circuits Higher heat resistance (260 C for 30 sec.) High heat resistance (400 C for 10 sec.) High dimensional accuracy ( 0.02%) High heat resistance (450 C for 3 sec.) Flying-lead construction (50 mm pitch) Microbump array (200 mm pitch) High dimensional accuracy ( 0.01%) High dimensional accuracy ( 0.05%) uniform tin plating Microbump array hard gold plating on nickel
all requirements. Therefore, suitable combinations are recommended to complete all terminations in an electronic product or module. Table 64.12 shows several examples of the major termination technologies used for high-density flexible circuits.
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