51, Mil British wire
Is a kind of tiny units of length, that is, 0.001 in thousandths of inches 【】 of that. Circuit board industry commonly used to express "thickness." The word translated in the machinery industry of the original "English silk" or the "silk," There is also the line for years, the Department of the basic jargon. However, some of the early American "amps electronic" the PCB practitioners, unknown on the inside has not deepened study, has listed it with another micro-metric unit of length of the "section" (10 microns) confused. Spread so far has made most of the industry or the downstream assembly industry, incorrectly relay erroneous messages in the two decades under the deep-rooted plot is even if he wanted to correct the non-shing is also very easy. The most puzzling is that even finger micro-inch gold-plated layer thickness (m-in), do not distinguish be indiscriminate called "Article", an exercise in extremely baffling. Instead, the mainland's PCB industry still uses the right. In addition, if the three letters written in MIL-wide large when compared with "U.S." Military abbreviation commonly used in U.S. military specifications (eg MIL-P-13949H, or MIL-P-55110D) with the U.S. military standards (eg MIL-STD -202, etc.) in written or spoken.
52, Minimum Electrical Spacing electrical spacing minimum electrical spacing of the narrowest
Means between the two conductors, at a specified voltage, want to avoid the media during a crash occurs (Break down), or want to prevent the occurrence of corona (Corona) purposes, the minimum distance that should have the "minimum spacing."
53, Mounting Hole Hole
For the circuit board a non-conductive function in an independent large holes will the assembly plate firmly locked in the body structure rather useful. Such as a mechanical use of holes known as the "mounting hole." This term also refers to the heavier parts in order to screw with the lock on the board in terms of the mechanical holes.
54, Mounting Hole-hole assembly, machine loading Kong
Is to use screws or other metal fasteners, locks will be assembled plate set at the machine tool base or the shell hole diameter of about 160mil a large hole. Kind of assembly are taken both sides of the early hole-hole ring and bore a large brass wall of the PTH, post-hole wall in order to prevent the dip in the wave soldering tin affecting the screws through the purposes, the new design will be big holes into a special "non-plated through-hole" (in the PTH to be covered before or after drilling the second hole copper plating), while the surrounding ring width of another to do a few small holes in order to enhance hole ring in the strength of solid plate surface. NPTH is very troublesome because of the recent SMT board there will be big holes only to revert to PTH, its two faces most part not the same, often will be welded face cancellation of a large ring into several independent small rings, or into a U-shaped non - complete a large ring, or expand into an area of a huge bronze statue shaped face, also offering for grounding purposes.
55, Negative Negative, drill tip the outer edge of the first face narrows
Refers to a variety of film (such as black and white film, brown film and glass negatives, etc.), conductor line pattern is based on translucency rendering, without the conductor of the substrate part is presented as a dark area (ie, black or brown film on the part) in order to prevent ultraviolet light through. Such a film that's negative. Also, this word also means a bit of the drill point, the two first side outer edge of the improper re-grinding and the narrowing of the case.
56, Non-Circular Land non-circular hole ring pads
Early the circuit board through-hole components are mainly made mainly to fill in hole solder to complete the interconnection (Interconnection) function. Large size or weight of some heavier parts, for the welding strength at the plate surface to better purposes, deliberately outside of its circular hole bigger pad to enhance the adhesion of weld ring, and the formation of larger Cone-shaped solder joints. Such oversized pad is particularly common in the single-sided board.
57, Pad Master round bottom piece
The supply of the early customers of the original negatives of the kind that only "holes" in black and white "Multiply." Each center has a black circle dot blank pad is as a "program to play with machines" used to find accurate holes. The Pad Master program with the completion of hole-making, we will still center of each circle pad blank spots to be blotted out manually and then translated into negative, it becomes masking film. Now the designer has all the necessary on board the "Moroto and scale" are made of Gerber File a floppy disk, a direct input to the CAM and laser drawing machine, you can receive the necessary film, not only saves manpower but also the quality has increased dramatically. Pad Master drawings shall be new corner of the film is received by two large-scale IC socket holes.
58, Pad pad, round pad
This word in the circuit board of the most original meaning is that part of the welding pin board on the base. THT early age, the Department indicated that the outer surface of the hole plate ring. The SMT era after 1985, this word also means the surface of a square plate pads. However, this word is also often leads to other related aspects, such as the inner plate surface has not yet become a hole bored in various dot or small ring disc, the industry is also commonly known as Pad; this word with Land universal.
59, Panel Process plate
Refers to the process at various points in the flow of Daizhi board. Its a Panel may contain several movie "The Finished Board" (Board). These "process boards" in size, in each station is not necessarily the same, such as the Panel Lamination Station plate surface may be very large but in order to adapt to each drill shaft boring machines operating purposes, but to cut to half, or four points, one of the Panel Size. When the finished board area is very small, each of its Panel of multi-chip can be discharged into the Board. Panel Size is usually greater then the production of more economic.
60, Pattern plate surface graphics
Usually refers to the circuit board surface of conductors or conductor graphics in terms of graphics, of course, the blueprint of the film or the line pattern can also be known as the Pattern.
61, Photographic Film Photographic images of the film
Refers to the circuit board pattern of the original carrier, which is commonly known as the "film" (Art Work). Commonly used are Mylar-type film and the glass of the hard film. The shading pattern of thin-film material, there is a black silver halide (Silver halid) and brown of the azo compounds (Diazo). The former almost block all light, which can only block the UV light below 550nm. The wavelength of visible light in the 550nm and above, the photosensitive dry film has been the role does not occur, so the work area can use yellow lights, compared to silver halide black and white film only in the dull red light, work, indeed to be much simpler.
62, Photoplotter, Plotter optical plotter
Mobility is a multi-strand single-beam of light exposure method, instead of the traditional fixed-point-like source of the moment a comprehensive exposure method. In the digital technology and computer-assisted design the next, PCB designers can be the original of the hole rings, pads, wiring and dimensions and other precise information, entered into a computer in the Gerber File system, for admission to a floppy disk inside. Circuit board producers to be a floppy disk, you can use CAM and optical drawing machine operation to be precise size film, caused in transit from the deformation of the film. As the common light source type Photoplotter weaknesses, it has been eliminated. Now the industry have been treated using laser light sources as plotters. Has become a commodity who has Flatbed (Flat Bed), inside the cylinder-type (Inner drum), outside the cylinder-type (Outer Drum), and separately from different imaging modalities such as regional-style machines. Its services, are also advantages and disadvantages, is an essential tool of modern PCB factory. Light-sensitive imaging can also be used in other areas of work, such as LCD, PCM and other industries.
63, Phototool film
More commonly refers to azo-brown tablets (Diazo film), can work under the yellow light, compared to only red light to work in black and white silver halide film to be more convenient.
64, Pin-pin, hinge, pin
Means the circuit board holes in the tin-plated parts of the instrumentation feet, or the pins and other gold-plated. Can be used as mechanical support and the conductive interconnect useful, is an early assembly of circuit board jack vectors. Its vertical and horizontal spacing of the (Pitch) early majority Kimisada for 100 mil, to be taken as circuit boards and various parts manufacturing basis.
65, Pitch span, feet distance, pad pitch, wire distance
Pitch simply means the board two "unit" of the distance between centers, PCB industry, used American expression of mil pitch, Ji Zhi centerline between the two pads in terms of span mil. Pitch and Spacing different, the latter usually refers to the two conductors of the "isolation plate surface," is an area rather than length.
66, Plotting Plotting
By mechanical means will be X, Y coordinates of the large number of data in the plane coordinate system, described as the actual circuit diagram of the operation process is referred to as Plot or Plotting. The current production of the film have abandoned the earlier hand map (Tape up), be replaced by "optical mapping" method to complete the film, not only saves manpower, but also better quality.
67, Polarizing Slot partial slot
Fingerboard slotted edge finger area, the general location of slotted deliberately placed side in order to avoid possible interpolation anti-symmetrical, such as the plug and ensure the correct direction of additional slots, also known as the Keying Slot.
68, Process Camera Process with the camera
Are doing film (Artwork) enlarge, reduce, or from the patch (Tape up) obtained photographic film directly to a dedicated camera. Its composition has Sanda Jian upright on the track and movable parallel to each other, that is, the original right-hand side graph patch or master frames, lenses, and left to be a child of film frame images and so on. This is the way of early production of the film has now advanced to digital, disk obtained from customers through the computer software and electrical work under fire plotter, you can directly from the original negatives no longer need then to the camera in.
69, Production Master production of the film
1:1 refers to the circuit board can be used directly to health in terms of the original-inch negatives, as the size and tolerance of various yuan shall be shown separately in the main map (Master Drawing that is a blueprint).
70, Reference Dimension reference scale, reference size
Only reference to use of the scale, has not established a tolerance for it can not be treated as a formal basis for the construction and materials inspection.
71, Reference Edge reference to the edge of
Edge refers to a conductor on board corner of an edge can be used as full-plate-size measurement reference, and sometimes also referred to in terms of a particular identification mark.
72, Register Mark alignment with the mark
Means a film or plate surface, the borders or the corner of the set of special tags for checking the alignment between the layer or layers of the case, shall be two kinds of icons are commonly used alignment mark. Concentric circles which can each layer in the multilayer board edge or corner boards in order of ornaments of different diameter rings, etc. All after just check the pressure "sweep out" (ie, milling out) three-dimensional sets of concentric circles of quasi-case, you can judge its degree of alignment between layers of good or bad.
73, Registration alignment degree
Circuit board surface of the actual location of the various conductors, and the original film or the original design of the original location, its degree of approximation between the two, saying that the "Registration". China Industry translated as "coincidence degree." "Alignment degree" may refer to a plate surface of the conductor film with the degree of alignment; or refer to plywood the "Layer to Layer-degree" (Layer to Layer Registration), Jie Wei PCB important qualities.
74, Revision revision and revised version of
Means the design specifications or product version or edition revised, usually in its capital, code-named after the English alphabetical order of the said as modified.
75, Schemetic Diagram Circuit profiling
Using a variety of symbols, electrical connections, part shape and so on, drawn into the circuit layout of the system overview diagram.
76, Secondary Side 2nd side
Namely, the original term of the circuit board early, "Solder side" (Solder Side). Socket welding parts due to the early days, all components are housed in the first surface (or Component Side; component surface), the second contact surface only as the wave soldering purposes, it is called the solder side. To be installed in recent years due to the rise of SMT sticky surface, its positive and negative sides are equipped with a lot of parts, it is inappropriate to be adjourned as solder surface, while the "second side" more appropriate.
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