1, Annular Ring-hole ring
Means connected to hole wall around the outer flat surface of copper rings attached to the board in terms of. Holes in the inner part of this board often cross the bridge with the outside connected to the earth, and more often as a line or too stop the endpoint. In addition to the outer panel as a stand-off line, but also as a part-pin plug welding could be used to pad. Synonymous with this word there Pad (with circle), Land (separate points) and so on.
2, Artwork film
In the circuit board industry, this word often refers to in terms of black and white film. As for the brown, "Azo-chip" (Diazo Film) is on a separate Phototool to the name of the. PCB used in the film can be divided into "original film" Master Artwork and turned according to post-"working the film" Working Artwork and so on.
3, Basic Grid basic grid
Means the circuit board in the design, its conductor layout of the whereabouts of the vertical and horizontal grid location. Early grid distance is 100 mil, at present due to the prevalence of thin dense line, the basic grid distance is no longer reduced to 50 mil.
4, Blind Via Hole Blind Hole
Refers to a complex multilayer, the part of the guide hole for only some layers of the interconnect, it is deliberately not completely drill through, if there is an orifice which connects the outer ring hole laminates, such as cup - dead-end special hole, known as "blind hole" (Blind Hole).
5, Block Diagram circuit system block diagram
Will be required to assemble a variety of boards and components in the design map with square or rectangular empty box to box out, and with various electrical symbols, the relationship between its various boxes one by one contact, so that the composition of a systematic the organization chart.
6, Bomb Sight shells marked
Originally referred to the bombers bomb targeting screen. PCB production in the film, when, for alignment purposes are also set up in every corner of the upper and lower levels aligned with the targets, which the official name should more accurately called the Photographers' Target.
7, Break-away panel can be broken plate
That many of the smaller circuit board, in order to plug in the downstream assembly line, put parts, welding and other operations for your convenience, in the PCB manufacturing process, special to the blend in a large board to carry out various processing. Completed in order to jump again when the knife way, in all the independent partial cut between the small plate appearance (Routing) off, but they retain sufficient strength and several "contiguous" (Tie Bar or Break-away Tab), and at the company Film and plate with a side room and then drill a few small holes; or up and down the cut V-shaped notch to facilitate the assembly process has been completed, can be separated from each board broken. The small board joint assembly methods in the future will be more and more, IC card is one example.
8, Buried Via Hole buried vias
Means the partial derivative multilayer hole, when its buried in the internal layer of plywood would become the "in-hole", and did not with the outer board "connectivity", I referred to as buried vias or simply buried hole.
9, Bus Bar Meeting poles
Multi-fingered plating tank anode rod on the cathode, or itself, or its connecting cable run. Another in the "manufacturing process" of the circuit board, its finger at the outer edge near the plate edges, the original one with a common wire (gold-plated operation need to be covered), and then the other to a small narrow piece (both the amount of savings in gold and therefore need to minimize their size) with the fingers connected with such a conductive connection also known as Bus Bar. In the individual fingers and Bus Bar connected to the small piece of claimed Shooting Bar. The completion of the board cut appearance, the two will be cut off.
10, CAD computer-aided design
Computer Aided Design, is the use of special software and hardware on the circuit board to digitize the layout (Layout), and to optical plotter will be made from the original digital data transfer film. Such CAD system on the circuit board before the project is more precise than manual methods and convenience.
11, Center-to-Center Spacing Center Spacing
Fingerboard surface of any two conductors of its distance from center to center mark (Nominal Distance) is concerned. If the conductor arranged in a row, while the width and spacing of their own and both are the same (such as the golden finger of the order), this "center to center spacing," also known as pitch (Pitch).
12, Clearance room I gap, an empty ring
Refers to the inner layer of the plywood, if not like to see his conductor surface and the hole-hole wall when connected, you can foil around the hole formed by corrosion off the empty ring, special known as the "Ring." Also printed on the outer surface of the masking plate with the holes the distance between the rings, also known as Clearance. However, because of the current circuit board density increased more gradually, making room for the original of this masking has also been pressed into was almost gone.
13, Component Hole Holes
Means the board on the part of the through-hole pin instrumentation, this pin hole diameter on average of about 40 mil. SMT is now prevailing, the large diameter of the jack has gradually diminished, leaving only a small number of connectors also need to insert the gold pinhole welding, the rest of the majority of SMD components have been switched to the surface sticky installed.
14, Component Side component surface
Early in the circuit board to adopt the whole era of THT, parts must be mounted on the front board, it is also called its positive as "component side." Board of the negative result of only waves through wave soldering tin, it is also known as "solder side" (Soldering Side). Both sides of the plate current SMT equipment parts should be sticky, and therefore have no special feeling "component side" or "solder side", and can only be called positive or negative. Normally be printed on the front of the electronic machine name of the manufacturer, while the circuit board factory is a UL-generation characters and production date, the opposite may be added to the board.
15, Conductor Spacing conductor spacing
Means the circuit board surface of a conductor, since its edge to another edge of the recent conductor, during the span covering the insulating substrate surface, namely, that of the conductor spacing, or commonly known as pitch. Also, Conductor is a circuit board in various forms of metal conductors, said Pan.
16, Contact Area contact resistance
In the circuit board is designed to refer to finger the point of contact with the connectors, when the electrical current passes through the resistance of that presented. In order to reduce the formation of oxides on metal surfaces, usually cheat positive part, and the negative card connectors plated metal clip units are required in order to restrain arrived in their "pick up resistance" from happening. Other electrical goods plug squeeze into the socket, or guide pin Zama also have access to their contact resistance exists.
17, Corner Mark plate angle marker
Film on the circuit board are often left behind in the four corners of special markings as the board of the actual border. Ruoqiang of these markers to connect the inner edge shall be completed by the external panel contour (Contour) boundaries.
18, Counterboring set deep reaming, buried hole
Board locking screws can be fixed in the machine, this matching of non-conduction hole (NPTH), the orifice to be done to accommodate the nut, "reaming" so that screws can be sunk in the buried plate surface, the in order to reduce the appearance caused by blockages.
19, Crosshatching Cross Area
Circuit board surface area of some large-scale conductor, in order to the plate surface and masking have been a better adhesion between the interest would often turn off a sense of part of the copper surface, leaving a number of vertical and horizontal cross-cross lines, The structure, such as tennis racket, like, so will be able to resolve the large-scale copper, due to thermal expansion and the existence of floating away from the crisis. Etching proceeds of its cross-graph is called Crosshatch, and this improved approach is called Crosshatching.
20, Countersinking taper reaming, horn Kong
Is another kind of locking screw holes with more wood used in furniture, appeared less sophisticated electronics industries.
21, Crossection Area cross-sectional area
Cross-sectional area of circuit board size, will directly affect its current-carrying capacity, so that the design should first be included in the view, often a sense of part of the copper surface will turn out, leaving a number of vertical and horizontal cross-cross lines, such as tennis Like the structure of film, so will be able to resolve the large-scale copper, due to thermal expansion and the existence of floating away from the crisis. Etching proceeds of its cross-graph is called Crosshatch, and this improved approach is called Crosshatching.
22, Current-Carrying Capability-carrying capacity of
Refers to wire on the board, in specified circumstances continuously through the maximum current strength (amperes), while unlikely to cause the circuit board in electrical and mechanical nature of the degradation (Degradation), the number of ampere maximum current shall be the line's "current-carrying capability."
23, Datum Reference Benchmark Reference
In the PCB manufacturing and testing process, in order to be able to graph the film is properly positioned in the plate surface of the sake, special selection of a point, line, or hole surface graphics benchmark as its reference, known as the Datum Point, Datum Line, also known as Datum Level (Plane), also known as Datum Hole.
24, Dummy Land off pads
Assembly in order to pull on the height of the existing parts, some parts of the plate surface, under the stomach needs to be boosted, so that dispensing and then to have a better ability, and can be used for etching circuit boards, deliberately left in the area do not pin Zhizuo booster with no electricity and the "false copper pad," that's Dummy Land. But sometimes plate surface due to poor design, there will be a large area non-copper layer substrate surface, the distribution of a little hole or line. In order to avoid such independent conductors when the excessive current in the copper concentration, but the sake of all kinds are missing, but also increase the number of non-functional pseudo-pad or false lines, sharing out some time in the plating current, so that a small independent conductor current density is not to be too high, the copper surface is also known as Dummy Conductors.
25, Edge Spacing Edge open space
Means the distance from the plate edge-to-its "recent conductor lines," the open space between this paragraph the purpose of open space is to avoid too close to the conductor plate edges, while the other parts of the machine may short-circuit the problem of the United States UL safety certification, this project particular care. General plate of the white border layer and other defects can not be penetrated this "borderland" width half. |
