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contact copier
A contact copier (also known as contact printer), is a device used to copy an image (negative or positive depending on the process), by illuminating the photolith that contains it, placing it in direct contact with a photosensitive surface (film, paper, plate or sheet) on which a (negative) image is formed from the photolith Original. The light source can be an actínic bulb internal or external to the device
It consists essentially in a flat glass on which the original photolith is placed in direct contact with the surface (paper, film, plate) to be exposed, with a pump for creating a vacuum around both (optional), and a light source (actinic UV tubes in the case of offset and PCB manufacturing) making use of an automatic timer (optional).〔
== Uses ==
This contact copying process that was used in the early photography days, it is also used, among others: in silkscreen printing, in ''blueprint'' copying, in the CTF offset printing processes and in the PCB manufacture.
The contact copier comprises a source of intense light projected through a photolith film that only lets light pass through in clear areas (those not printed). Silk frames, offset plates or PCB, are usually impregnated with a photosensitive material (varnish type) which reacts with light that modifies its surface characteristics. Subsequently, some portions of the photo-sensitized varnish may be removed, leaving the final product ready for use .
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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