intercharacter gap; intercharacter space:
The space between the last bar of
one symbol character and the first bar of the next in a discrete bar code
symbology. See “discrete code,” “continuous code.”
Interleaved 2-of-5 (ITF):
A bar code symbology encoding the ten digits 0
through 9. The name Interleaved 2 of 5 is derived from the method used to
encode two adjacent characters. In the symbol, two characters are paired, using
bars to represent the first character and the interleaved spaces to represent the
second character. Each character has two wide elements and three narrow
elements for a total of five elements. For any appreciable degree of data security
the application in which the symbol is to be read should define a fixed length for
the symbol and the symbol should employ bearer bars. Most commonly
represented in the U.P.C. Shipping Container Symbol (SCC-14).
ISO:
The International Organization for Standardization is an international
standard-setting body composed of representatives from national standards
bodies. Founded on February 23,
1947
, the organization produces world-wide
industrial and commercial standards. http://www.iso.org
ladder orientation; vertical bar code:
Position of a bar code symbol in which
the axis of the bars is horizontal in order to enable a vertical scanning beam to
traverse the complete symbol. Compare to “picket fence orientation.”
LASER (Light Amplification by the Stimulated Emission of Radiation).
A
device for producing an intense beam of monochromatic coherent light.
laser diode:
A light producing semiconductor capable of producing coherent
light.
LED (Light Emitting Diode):
A semiconductor that produces light at a
wavelength determined by its chemical composition as a result of electrical
stimulation. A range of devices is available, each having an output with a peak
wavelength in the spectrum between 600 nanometres (visible red) and 900
nanometres (infrared). It is commonly used as a light source in wand, CCD and
slot-type bar code readers.
letterpress:
A printing process that employs a relief, or raised, inked image that
comes into direct contact with the material being printed. Letterpress printing can
be performed from metal type or plates, or rubber or plastic plates, using a rotary,
flatbed, or platen press.
light margin:
See “quiet zone.”
light pen; light wand:
A hand-held bar code reading device which emits a
single non-moving beam that must be passed across the symbol in order that the
symbol may be decoded.
light source:
Light energy is emitted in straight lines from one of two source
types, the point source and the extended source. The point source is ideally a
single point. The extended source of light energy illuminates a point in space
46
Summary of Contents for Quick Check PC600
Page 1: ...Quick Check PC600 Bar Code Verifier User s Guide ...
Page 6: ...5 ...
