Production of inhomogeneous films by sequential layers of homoge

Details Production of inhomogeneous films by sequential layers of homoge Production of inhomogeneous films by sequential layers of homoge

1978-11-24

1979-11-27

Hoffman, James R.

Coating processes

Coating has x-ray, ultraviolet, or infrared properties

427162, 427164, G02B 110, B05D 136

Patent

active

041762088

ABSTRACT:
The present invention directed to antireflective coatings presents a new method for producing graded index films from alternating very thin layers of two materials with proper but differing indices. During deposition the thickness of each of the many layer pairs deposited can remain fairly uniform while the layer thickness of the two materials making up each pair is adjusted so that the resulting average index matches the index of the desired profile for that part of the total thickness. A two source evaporation deposition system is used and the two materials may be, for example, thallium iodide and lead fluoride.

REFERENCES:
patent: 3959548 (1976-05-01), Bernal
patent: 4009300 (1977-02-01), Chaffin
patent: 4110489 (1978-08-01), Chaffin et al.

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