Glass manufacturing – Processes – With chemically reactive treatment of glass preform
Patent
1984-01-20
1986-01-07
Schor, Kenneth M.
Glass manufacturing
Processes
With chemically reactive treatment of glass preform
65 31, C03C 2100, C03C 1900
Patent
active
045632057
ABSTRACT:
A process for the production of a slab-shaped lens having a gradient of refractive index only in the direction of thickness thereof is described, comprising stuffing a solution of dopant into micropores of a plate-shaped porous glass product with or without a heat-resistant film covered on both side surfaces thereof; unstuffing a part of the dopant to form a gradient of dopant concentration in the glass product; precipitating the dopant in the micropores; drying the porous glass product to evaporate the solvent remaining in the micropores; collapsing the micropores by applying a heat treatment to form a gradient of refractive index in the plate-shaped glass product; and when the side surfaces are not covered with the film, cutting off both side end portions of the plate-shaped glass product.
REFERENCES:
patent: 3486808 (1969-12-01), Hamblen
patent: 3941474 (1976-03-01), Kitano et al.
patent: 4073579 (1978-02-01), Deeg et al.
patent: 4110093 (1978-08-01), Macedo et al.
patent: 4299608 (1981-11-01), Macedo et al.
patent: 4302231 (1981-11-01), Macedo et al.
Asahara Yoshiyuki
Ohmi Shigeaki
Sakai Hiroshi
Shingaki Seiichi
Hoya Corporation
Schor Kenneth M.
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