Patent ID: 7353666

Claim:
A method for press-molding a glass optical element by use of an apparatus, said apparatus including; a mold comprising a first die and a second die, each of said dies having a molding surface facing with the other, said first die being fixed to a structure member of the apparatus and said second die being movable; driving means for moving the second die toward and away from the first die; heating means; detecting means; and a controller, said method comprising: supplying said mold with a glass preform between the first die and the second die, press-molding the glass preform with the first die and the second die, heating the first and second dies by the heating means, detecting a displacement of a part of the structure member by the detecting means, calculating a correction value for a moving distance of the second die based on the detected displacement by the controller, and controlling the driving means so that the second die moves a distance in accordance with the correction value by the controller.