Method for manufacturing GRIN lens

Details Method for manufacturing GRIN lens Method for manufacturing GRIN lens

2011-04-12

2011-04-12

Dehghan, Queenie (Department: 1741)

Glass manufacturing

Processes

Sol-gel or liquid phase route utilized

C065S440000

Reexamination Certificate

active

07921672

ABSTRACT:
A method for manufacturing a GRIN lens includes the steps of forming a wet gel provided with a concentration distribution having a different concentration of a refractive index distribution imparting metal that differs in concentration in a radial direction, drying the wet gel to form a dry gel having a bulk specific gravity ρ (g/cm3), sintering the dry gel to form a GRIN lens base material and stretching the GRIN lens base material while heating. The method is characterized in that, in the step of sintering the dry gel, partial pressures of oxygen during sintering at 800° C. or higher are 10−1Pa or lower and also the relation between a rate of temperature increase v (° C./hr) and a bulk density ρ of the dry gel during sintering at 1,000 to 1,150° C. is defined by v≦105*EXP (−12ρ). As a result of this, the GRIN lens, which has a large numerical aperture and a small diameter, can stably and easily be manufactured.

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Japanese Office Action mailed Aug. 24, 2010 in corresponding Japanese patent Application No. 2006-519030 (with English translation).

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