Glass lens forming device and glass lens forming method

Abstract

The present invention provided a glass lens shaping device and a glass lens shaping method. In the glass lens shaping device, to make each upper die (1B) move upwards relative to each lower die (1C) by means of the lifting of a push rod (7) during the former half section of a hot pressing step, so as to release each glass raw materials from holding state, thus each glass raw materials (G) is received at a proper position in the die groove of each lower die (1C) by self-weight. Then, to make each upper die (1B) move downwards by means of the descend of the push rod (7), so as to fill each glass raw materials (G) at the suitable position, then to shape a plurality of glass lens at one time using each shaping die assembly (1) in the refilling state, so as to avoid bad formation of the glass lens caused by insuitable filling position of the glass raw materials (G). In addition, each upper die (1B) is preheated by means of contacting with an upper heating component (6) during the former half section of the hot pressing step, so as to reduce heating time of the hot pressing step.

Description

technical field [0001] The present invention relates to a glass lens forming device and a glass lens forming method which simultaneously form a plurality of glass lenses using a plurality of forming die modules in a hot pressing step. Background technique [0002] Previously, a glass lens forming device is generally known in which glass raw material is filled in a cavity between a lower mold and an upper mold held in a sleeve of a forming mold, and the glass raw material is heated in the cavity. It is softened and pressurized to form a glass lens of a predetermined shape (for example, refer to Japanese Patent Laid-Open No. 5-24869 ( Figure 6 ), Japanese Patent Laid-Open No. 2004-149410 (paragraph numbers 45, 46)). And, in Japanese Patent Application Laid-Open No. 5-24869 ( Figure 6 ), as a previous example, a technique of simultaneously molding a plurality of glass lenses using a plurality of molding dies is disclosed. [0003] Here, in the known glass lens molding appara...

AI Technical Summary

Problems solved by technology

[0007] Therefore, when using a plurality of molding dies having a reground lower die or upper die mixed with a standard molding die, and using a single heating member to simultaneously shape a plurality of glass lenses, each molding die may be connected to a single forming die. The initial contact state of the heating element is not uniform

As a result, a single heating element may exert excessive pressure on the glass raw material in a standard forming mold with a slightly larger dimension in the height direction and cause the glass raw material to break

In addition, the glass raw material in the molding die having a reground lower die or upper die with a slightly smaller dimension in the height direction is insufficiently pressurized, and the glass lens may be poorly formed.

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