Radiation imagery chemistry: process – composition – or product th – Radiation modifying product or process of making – Screen other than for cathode-ray tube
Patent
1978-04-10
1980-02-12
Kimlin, Edward C.
Radiation imagery chemistry: process, composition, or product th
Radiation modifying product or process of making
Screen other than for cathode-ray tube
355125, 430356, 430301, G03F 500
Patent
active
041882253
ABSTRACT:
An improved halftone dot screen for use in reproduction of continuous-tone graphic images is disclosed. The screen comprises a two-dimensional matrix of cells (dots) each cell having a common pattern of transmittance to radiation utilized in the reproduction process. The common pattern of transmittance for each cell is characterized by a finite number of different discrete transmittance level patterns. In a preferred embodiment, these patterns include portions arranged along the respective sides of a parallelogram. In one preferred embodiment, the discrete transmittance level patterns comprise an array of concentric parallelograms. Each parallelogram has a plurality of dot portions arranged along the sides of the parallelogram. The sides of the parallelogram patterns are preferably disposed at a substantial angle to the horizontal to reduce moire and rosette pattern effects and to simplify the reproduction process.
REFERENCES:
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patent: 3565527 (1971-02-01), Crespi
patent: 3737321 (1973-06-01), Torr et al.
patent: 3746540 (1973-07-01), Rarey
patent: 3814608 (1974-06-01), Middlemiss
Aine Harry E.
Kimlin Edward C.
Lowhurst Harvey G.
Lumin Inc.
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