IPC-T-50F_.pdf.pdf - 第23页

Cover Lay (Flexible Circuit) 42.0304 The layer of insulating material that is applied covering totally or partially over a conductive pattern on the outer surfaces of a printed board. Cover Layer 42.0305 see ‘ ‘Cover Lay…

Continuity 92.0284

An uninterrupted path for the ﬂow of electrical current in a

circuit.

Contract Services 17.0285

Printed-board manufacturing processing operations that are

performed for by another vendor outside the manufactur-

er’s facility.

Control Chart 91.1368

A graphic representation of a characteristic of a process

that shows plotted values of some statistic gathered from

characteristic, a central line, and one or two statistically-

derived control limits.

Control Console 11.0286

A device terminal used to manipulate and maintain the

operating system of a computer.

Control Drawing 22.0287

see ‘‘Master Drawing.’’

Control Limits 91.0290

The maximum allowable variation of a process characteris-

tic due alone to common causes.

Controlled Collapse, Component Connection 75.0289

see ‘‘Controlled Collapse Soldering’’

Controlled Collapse Soldering 75.0288

The making of termination by controlling the height of sol-

der balls in a ﬂip-chip assembly operation.

Convected Energy 75.1736

Heat transferred through circulation of ﬂuid or gas.

Conveyor, Edge 70.0291

A transporting mechanism that supports a product by the

edges.

Conveyor, Mesh 70.0292

A transporting mechanism that fully supports the product.

Conveyor, Secondary 70.0293

A transporting mechanism used beneath the edge conveyor

to catch a fallen product.

Coordinatograph 92.0294

An X- and Y-coordinate plotting and measuring machine.

Coplanar Leads 33.0295

The ﬂat beam leads of a component package that have been

formed so that they can simultaneously contact one plane

of a base material.

Copolymerize 49.0847

The creation of a polymer by the joining of two or more

different monomers in repeating chain.

Copper-Mirror Test 92.0296

A test of the corrosivity of a ﬂux on a copper ﬁlm that is

vacuum- deposited on a glass plate.

Corner Marks 22.0297

The marks at the corners of artwork whose inside edges

establish, or help to establish, the borders and contour of a

printed board.

Coronizing 44.0298

Continuous heat cleaning and weave setting.

Corrosion (Chemical/Electrolytic) 76.0299

The attack of chemicals, ﬂux, and ﬂux residues on base

metals.

Corrosive Flux 75.0300

Flux that contains levels of halides, amines, or organic

acids that cause corrosion of copper.

Cosine Law (Illumination) 24.1369

A law of illumination that states that the ﬂux radiated or

received in a given direction varies with the projected area

of the receiver or emitter in a plane that is perpendicular to

the direction of the ﬂux.

Cost of Quality 94.0301

The money spent in the creation, control, and evaluation of

quality and the consequences of the failure to meet speci-

ﬁed requirements.

Coupon 92.0302

see ‘‘Test Coupon.’’

Coupon (Breakaway) 92.1220

Coupons made as an integral part of the end product board

and connected as one piece, except one edge of the coupon

has perforations or a thin section connected to the board

which can be easily broken off without damaging either the

coupon or the board.

Cover Coat 42.0303

see ‘‘Cover Lay.’’

IPC-I-001152

Figure C–6 Soldering contact angle

IPC-T-50F June 1996

Cover Lay (Flexible Circuit) 42.0304

The layer of insulating material that is applied covering

totally or partially over a conductive pattern on the outer

surfaces of a printed board.

Cover Layer 42.0305

see ‘‘Cover Lay.’’

Cpk Index (Cpk) 91.0307

A measure of the relationship between the scaled distance

between the process mean value and the closest speciﬁca-

tion limit.

Crack, Foil 90.0308

A break or separation that extends partially or completely

through a layer of metallic foil.

Crack, Plating 90.0309

A break or separation that extends partially or completely

through a metallic coating(s), its overplate, or both.

Cracking 90.0310

A condition that makes breaks or separations in coatings

that extend through to an underlying surface.

Cratering 74.0311

A defect in which a portion of a die under is torn loose by

an excessive amount of ultrasonic wire-bonding energy.

Crazing (Base Material) 51.0312

An internal condition that occurs in reinforced laminate

base material whereby glass ﬁbers are separated from the

resin at the weave intersections. (This condition manifests

itself in the form of connected white spots or crosses that

are below the surface of the base material.) It is usually

related to mechanically-induced stress. (See ‘‘Measling.’’)

Crazing (Conformal Coating) 76.0313

A network of ﬁne cracks on the surface of, or within, a

conformal coating.

Crease 92.0314

A ridge in a material that is caused by a fold or wrinkle

being placed under pressure.

Creel 44.0315

A device used as a yarn package rack to hold warp ends for

a section beam.

Creep 40.0316

Time-dependent strain occurring under stress.

Crevice Corrosion 97.0317

Localized corrosion that is the result of the formation of a

crevice between a metal and a nonmetal, or between two

metal surfaces.

Crimp Contact 37.0318

A type of connector contact whose nonmating end is a hol-

low cylinder that can be crimped onto a wire inserted

within it.

Critical Current Density 53.0319

The current density above which a new and sometimes

undesirable reaction occurs.

Critical Defect 94.0320

Any anomaly speciﬁed as being unacceptable.

Critical Humidity 76.1371

The relative humidity above which the atmospheric corro-

sion rate of a given metal increases sharply or above which

the insulation decreases sharply.

Critical Operation 91.0321

One procedure of a total process that has a signiﬁcant

impact on the characteristics of the completed product.

Critical Solution Temperature 76.0322

The temperature above or below which two liquids are

miscible in all proportions.

Crop Marks 22.0323

see ‘‘Corner Marks.’’

Cross-Sectioning 92.0324

see ‘‘Microsectioning’’

Crosshatching 22.0325

The breaking up of large conductive areas by the use of a

pattern of voids in the conductive material.

Crossing Count 22.1372

The unit for measuring optimum component placement

characteristics that is based on the number of times there

are crossovers of the signal conductor that are used to pro-

vide electrical interconnection between devices.

Crosslink 40.0326

The formation of chemical bonds between molecules in a

thermosetting resin.

Crosstalk 21.0327

The undesirable interference caused by the coupling of

energy between signal paths. (See also ‘‘Backward

Crosstalk’’ and ‘‘Forward Crosstalk.’’)

Crystalline Polymer 40.0328

A polymer with a regular, structured molecular conﬁgura-

tion.

Cubic Components 30.1737

A part with a three-dimensional shape having the form of a

cube.

June 1996 IPC-T-50F

Cumulative Tolerance 22.1373

The summation of the tolerances that are permitted

between funtionally- related features. (See also ‘‘Baseline

Dimensioning,’’ ‘‘Basic Dimension,’’ ‘‘Chain Dimension-

ing’’ and ‘‘Direct Dimensioning.’’)

Cup Solder Terminal 37.0329

A cylindrical solder terminal with a hollow opening into

which one or more wires are placed prior to soldering. (See

Figure C-7.)

Cure 56.0330

A chemical reaction that changes the physical properties of

a substance, e.g., an adhesive.

Cure Time 56.0331

The time at which ultimate physical properties of a curing

thermosetting plastic composition are reached.

Curing Agent 56.0332

A chemical substance that can react with a resin in order to

physically harden the resin.

Current 21.1795

The ﬂow or movement of electrons in a conductor as the

result of a voltage difference between the ends of the con-

ductive path.

Current-Carrying Capacity 21.1374

The maximum electrical current that can be carried con-

tinuously by a conductor, under speciﬁed conditions, with-

out causing objectable degradation of electrical and

mechanical properties of the product.

Customer Detail Specification (CDS) 26.1779

A document that establishes the speciﬁc requirements,

noted in a detailed speciﬁcation, in order to tailor these to

meet the needs of a custom product, material, or service.

Cusum Chart 91.0333

A diagram that depicts cumulative deviation from a target.

Cut-and-Peel 24.0334

see ‘‘Cut-and-Strip.’’

Cut-and-Strip 24.0335

The making of artwork by cutting a pattern in a resist and

stripping away the unwanted areas or resist.

Cut-Off 74.0336

The operation that follows the ﬁnal bonding step that sepa-

rates the bond from the source of the wire.

Cylindrical Components 30.1738

A part having the shape of a cylinder.

D Curve 24.0347

see ‘‘Characteristic Curve’’

Data Capture 25.0340

The automatic collection of information from a given

machine or other information source.

Data File 11.0341

A database organized in a speciﬁc manner for a speciﬁc

application.

Data Layer 25.0342

A speciﬁc group of related records that are within any indi-

vidual data- information module.

Data Logging 11.0343

The ability of a host computer or test analyzer to store ana-

lyzed data along with statistical data.

Data-Entry Device 25.0337

A device terminal used to enter information into a com-

puter system. (See also ‘‘Control Console).

Data-Information Module (DIM) 25.0338

A group of records that contain related data that describe a

speciﬁc function or task.

Database 11.0339

A comprehensive collection of information that is so struc-

tured that some or all of its data may be used to create

queries about related items contained within it.

Date Code 30.1739

Marking of products to indicate their date of manufacture.

Datum 22.0344

The theoretically-exact point, axis or plane that is the ori-

gin from which the location of geometric characteristics of

features of a part are established.

IPC-I-000000

Figure C–7 Cup Solder Terminal

IPC-T-50F June 1996