26, Edge-Board contact Edge Finger
Yes that whole board of the International Liaison's exports, usually under the symmetric multi-set on both sides of the side panels, one can match the plug on the board edge connector.
27, Fan Out Wiring / Fan in Wiring fan-out wiring / fan-in wiring
QFP pads that arise surrounding the line conductor and the through-hole, etc., so that parts can be welded properly interconnect with the circuit board to complete the work. As the rectangular pad arranged very close, so its external contact pad side must take advantage of moments party insiders or outsiders moment the space pad to fan mode cabling, that the "fan-out" or "fan." For sleeker, lighter density PCB, can be placed in the outer layer of multi-pad in order to undertake some more parts, but will interconnect wiring needed to go to Tibet to the next level. The difference between the pad and the lead levels of the interface is based on cushions directly connected within the blind hole, do not do fan-out fan-in wiring, present, many high-performance small-scale mobile phone mobile phone board, that is, to adopt such a new form of stacked layer and the routing method.
28, Fiducial Mark optical targets, benchmarks signal
On-board surface to the downstream assembly, to facilitate their visual aids system operation purposes, often large-scale IC on the board position of the pad assembly of the outer edge of the open space, in its upper right and lower left triangle of each plus an "optical target" to help placement machine optical positioning, is an example. The PCB manufacturing process in order to film and plate surface in position on the alignment, often with two or more base plus sign.
29, Fillet fillet inner circle
Refers to two flat or two straight lines intersection in its vertical arc of material in terms of the premises Butian. The board frequently refers to parts of the solder pins, or board or T-shaped intersection of L-shaped lines, etc., within their circle filled in order to enhance the department's mechanical strong and current flow of convenience.
30, Film negatives
That has been lines of the film in terms of graphics. Usually 7mil and 4mil thickness of two kinds, the photosensitive silver halide film with a black and white, and brown or other colors of the azo compounds, the term is also known as Artwork.
31, Fine Line Thin
At the present level of technology, holes or average width between the four lines in the 5 ~ 6mil below, referred to as thin.
32, Fine Pitch Fine pitch, dense-line distance, from the dense mat
Where a foot away (Lead Pitch) is equal to or less than 0.635mm (25mil) who called the secret away.
33, Finger finger (Edge consecutive arranged contacts)
In order to allow the circuit board assembly of the entire piece features boards to outreach purposes, can be used Edge "Yang-style" gold-plated continuous contact in order to insert clip in the other system, "vaginal" to undertake a continuous device, so that can be to achieve the purpose of interconnectivity between systems. Finger's official name is "Edge-Board Contact".
34, Finishing finishes, and finally repair
Refers to a variety of products in appearance, the final modification, or repair work, make our products more attractive, protection, and texture purposes. Metal Finishing refers specifically to metal parts or products, to enhance their appearance on the concept of anti-corrosion features and add to do specifically in terms of processing layers, such as a variety of plating layer anodized film, the organic or inorganic coating, etc., are the The.
35, Form-to-List shows the list of routing
Is a direct written explanation of the various wiring systems list.
36, Gerber Date, Gerber File Gerber Files
Gerber is the American company for the circuit board line graphics and holes, the development of a complete range of software files. Designer or buy a company board can be a material issue of the all the graphic information into a Gerber File (the official scientific name is "RS 274 format"), through the Modem directly to a PCB manufacturer's hands, and then from the CAM-owned the output, coupled with the laser plotter (Laser Plotter) in operation, and have been drilling, testing, circuit film, masking film ... and even the downstream assembly operations and other specific information that enables PCB manufacturers can immediately engage in proofing or production, save a lot of communication and waiting time. Such circuit boards, "the system before it works" all kinds of information the computer software industry's begin with the current global standard operating Gerber File. There are also IPC-D-350D another set of software development, but has yet to see wide use.
37, Grid Standards Grid
Refers to the circuit board wiring graphic latitude and longitude grid when the basic terms of length and width of cells from the early each for 100 mil, which is based on "integrated circuit" (IC) pin pitch as the reference may be, the current density assembly has made such a Grid re-approximation to the 50 mil or 25 mil. Is located in the intersection on the grid is called On Grid.
38, Ground Plane Clearance grounding air ring
"Integrated circuit device" Whether it is the traditional IC, or VLSI, the grounding pin or voltage feet, with ground level (GND) or access voltage level (Vcc) connected to the foot hole, after, and then to "bridge the word" or " Cross Bridge "with the outside surface of the large copper interconnection. As for the wear layer which had completely take over a huge bronze surface hole, you must cancel any bridges with the field cut off. Also in order to avoid deformation due to heat and purposes, the through-hole with large copper surface must be left between the flexibility needed to empty out the expansion ring (Clearance Ring, that is the figure of the white ring). Thus the successive pins from the known level, you can determine in the end is GND or Vcc of. Through-hole production if the general mismanagement of the various stations, it will happen "pink ring", but such a pink ring ring should only appear in the air (Clearance Ring) hole within the ring (Annular Ring) on, instead of over the air ring left to its penetration into the earth, so going too far.
39, Ground plane (or Earth Plane) ground floor
Belongs to a kind of plywood inner plate surface, usually plywood layer circuit layer, need a huge bronze statue with a layer of ground surface layer to as many parts of public circuit grounding, shielding (Shielding), as well as the bulk Heat (Heatsinking) purposes. TTL logic of the traditional two-row pin IC, for example, from the front (back) when viewed with its sign at one end of the gap upward, which shall be first on the left foot (usually in the first ontology will be marked with Jiaopang a small depression or white point as identification), according to the order of a few to the row and the last foot is to "grounded foot." And then the number of anti-clockwise direction to another row of the final kick is to take voltage level (Power Plane) of the pin.
40, Hole Density hole density
Means the board in the unit area of the holes drilled in the number of terms.
41, Indexing Hole base hole, reference hole
Refers to the manufacture of circuit boards in the corner or the board Edge first hole drilled some tools in order as other image transfer, drilling, or cutting shape, as well as the pressing process together the basic reference point, known as Indexing Hole. Others are still Indexing Edge, Slot, Notch and other similar terminology.
42, Inspection Overlay sets of film review
The line is used translucent films or yin-yang-chip (such as Diazo film of brown, green or blue-chip films, etc.), can be used to register at the plate surface as a control tool for visual inspection, this method can be used to "the first test Products "(First Article) use of visual examination.
43, Key key slot, and telegraph key
The former refers to the finger board of a location of the slotted gap area is aimed at a negative connector to another to match, when you will not get in the docking of a foolproof anti-design, known as the Keying Slot. The latter refers to a sealed spring-contact touch keys can be used as telecommunications and jump quickly connected purposes.
44, Land-hole ring pad, surface (square) pads
SMT early yet to be introduced before the traditional socket welding parts of its legs, its external surface hole laminates ring, in addition to the interconnection of the electrical conductivity as a relay station (Terminal), the can still be with the pin to form a strong cone-shaped solder point. Sticky surface, the prevalence was loaded, the shift to the plate surface square pad also known as Land. This word might be translated as "welding ring" or "with Circle" or "pad", but translated as "blue island" or "Corn" is a bit too outrageous.
45, Landless Hole no loop-hole
That certain intensive assembly board, due to board layout required a number of lines and equipment parts square sticky pad, leaving very few open spaces. Sometimes no longer used in the outer layer wiring or plug welding, such as the conductive layer is only used as a guide hole (Via Hole), the loop holes can be removed, while freeing up more space for the cloth line, such that only the inner ring without outer-hole hole-hole ring, special called the Landless Hole.
46, Laser Photogenerator (LPG), Laser Photoplotter Laser Exposure Machine
Directly with a single laser beam with parallel light and then the computer control for the Pu system, the original production of PCB film (Master Artwork), to replace the earlier hand-crafted using the original large-scale patches (Tape-up), and re-reduction system made of the original film. The delivery of such original film is very difficult, if due to temperature and humidity changes can lead to differences in size of finished boards, precision quality board will be greatly affected. Now available from the Customer Services Department direct access to disk data, with the scanning laser exposure can be obtained excellent film, on the circuit board production and quality are of great benefit.
47, Lay Out routing, layout
Means the circuit board in the design at various levels in various parts of the arrangement, as well as the conductor direction of the location of hole layout of the whole is called Lay Out.
48, Layer to Layer Spacing distance between layers
Refers to the multilayer 2 the distance between the copper conductor layer, or refers to the thickness of the dielectric case. Usually adjacent circuit board in order to eliminate the noise generated by the sake of its level spacing in the medium to the thinner the better, so that noise generated by the sensor can be imported into ground floor. But how to avoid media-induced leakage is too thin, and maintain the necessary flatness, it is another two insurmountable problems.
49, Master Drawing Master plan
Refers to the circuit board manufacturing various specifications of the main reference, but also records the ministries board size and special requirements, commonly known as the "blueprint", is an important basis for product inspection. The so-called everything, "photographs of construction," unless approved by the authorized signatory further information (or telegram or fax, etc.) can change the master plan, the main provisions of the authority figure can not be avoided. Degree of its priority (Priority) although more than orders, and special information must be low, but higher than all written the "normative" (Specs), and customary practices have been more important.
50, Metal Halide Lamp Metal Halide
Iodine is a halogen in the one of iodine at high temperatures easily from solid directly "sublimate" into gas. In a tungsten filament incandescent light bulb within the body that if iodine was injected into them, then the iodine will form at high temperature in air. Such iodine gas can capture the sky has been evaporating tungsten atoms a chemical reaction, which will be re-tungsten atoms and then sink back into the tungsten filament on the poly, so will be able to significantly reduce the consumption of tungsten wire, and increase bulb life. And also to enhance its current efficiency and increased brightness. Normally used for car headlights, photography, film and Printing Down needed for the light sensitive. This iodine gas is also a non-continuous spectrum incandescent light source, its energy mostly concentrated in the ultraviolet region 410 ~ 430 nm spectral band, as in mercury, like gas lights, can not be subjected to switching. But it can not work, switch to a lower energy, maintenance of off-work time being eternal state to prepare for the next re-use, it will receive an immediate response moment. |
