ISO 6148:2001 写真—顕微鏡フィルム、スプール、コア—寸法 | ページ 2

3.1

aim dimension

preferred dimension at which the manufacturing process will be aimed or designed

3.2

diazo film

very low speed, high resolution, virtually grainless imaging material consisting mainly of a polyester support coated with a polymeric binder containing diazonium salts and a dye precursor which can couple in the presence of a base (e.g. ammonia vapour) to form an azo dye

Note 1 to entry: Exposure to UV or other actinic radiation causes decomposition of the diazonium salt and destruction of its dye-forming capability. These properties are the basis of a direct-positive imaging system, widely used for producing copies of original silver microfilms or other masters with automatic printer/processors that incorporate UV exposure and ammonia-developing components.

3.3

film

flexible plastic material coated with a sensitized-gelatin layer (an emulsion) that can produce stable images upon light exposure followed by chemical processing

Note 1 to entry: The flexible plastic material is usually transparent cellulose tri-acetate or polyester.

3.4

grid area

total area of the microfiche contained within the perimeter of the grid pattern

3.5

grid pattern

array of horizontal and vertical lines (usually not represented) which divides an area of a microform (usually a microfiche) into spaces called frames

3.6

heading area

area at the top of a microfiche reserved for the heading

3.7

heading area coating

translucent coating applied to the whole surface of the heading area to provide a surface that accepts writing

3.8

microfiche

microform in the shape of a rectangular sheet having one or more microimages usually arranged in a grid pattern, with a heading area across the top

3.9

microform

generic term for any form, usually film, which contains microimages

3.10

micrographics

process, equipment and functions of an information system involving microfilm images, recorded at a substantially reduced scale and viewed at appropriate magnification with the aid of optical or electronic display devices

3.11

nominal size

dimensions used in commerce for description of a product, as on product labels or in catalogues

Note 1 to entry: Nominal sizes are given only in metric values in new and newly revised standards, but are often given in metric and inch values in countries where both are still in everyday use.

3.12

preferred sizes

standard industry sizes, determined by most frequent user demand (number of units) and product volume (square metres)

Note 1 to entry: Designers of new equipment are encouraged to use preferred sizes whenever possible.

3.13

recognized sizes

sizes which are in less demand than preferred sizes, but are used in sufficiently large amounts to justify identification in standards

Note 1 to entry: This category includes sizes whose popularity is diminishing or increasing. However, new equipment should not be designed for such sizes.

3.14

splice

union of two pieces of film that are joined to form a single piece (usually found in roll format)

3.15

spool

flanged, cylindrical core for roll film, with drive holes in each flange and axial holes for insertion of a spindle or pin

3.16

tolerances

dimensions which define the boundaries of conformance of a product to the standard

Note 1 to entry: When tolerances are expressed as “±”, the reference is to the aim dimension, not to the nominal.

3.17

vesicular film

low-speed imaging material on a polyester support, coated with a thermoplastic layer containing a UV-sensitive diazonium salt which, upon exposure to actinic radiation, results in decomposition of the diazonium salt and the formation of a nitrogen gas

Note 1 to entry: Brief post-exposure heating of the film softens the binder layer and permits localized formation and trapping of tiny nitrogen gas bubbles, or vesicles. These scatter light and thereby can function as image elements under proper illumination and viewing conditions. To render such “bubble” images permanent, a second, uniform exposure is given and the resulting nitrogen gas is allowed to diffuse gradually to the surface and escape into the atmosphere.