The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 23, 1993
Filed:
Sep. 11, 1991
Yoshizo Komiyama, Gotenba, JP;
Toshiba Kikai Kabushiki Kaisha, Tokyo, JP;
Abstract
A glass blank is molded into a lens while being clamped between a pair of molds and heated by a heater. A mold clamping force is applied, substantially concurrently with the heating, to the molds to deform the lens blank. The mold clamping force is unable to deform the lens blank when the temperature of the lens blank is below a transition point of the lens blank and the mold clamping force is able to deform the lens blank when the temperature of the lens blank is above the transition point. The deformation starting point of the lens blank is detected based on a movement of the molds. A temperature of the molds at the deformation starting point is also detected. The temperature of the molds at the starting point is stored in a control device. The heating of the molds and the lens blank is controlled based on the difference between the temperature stored in the storing step and the transition point of the lens blank so as to prevent the temperature of the lens blank from exceeding the transition point by a predetermined degree. Press molding, with intensification of the mold clamping force, occurs with a progression of the deformation of the lens blank.