Method for producing lens array, and molding mold

Abstract

Provided are: a method for producing a lens array with which it is possible to prevent welds from being formed in the periphery of lens parts and to suppress an increase in the time for processing a transfer mold; and a molding mold. A master mold (10), which serves as a molding mold, comprises a plurality of linear grooves (14e) surrounding a plurality of cavities (12). Thus, resin is less likely to spread to corners (14p) where adjacent linear grooves (14e, 14e) intersect, and portions of resin that have run over toward the adjacent grooves (14e, 14e) can be prevented from contacting one another by spreading out so as to come close to one another, and from creating welds and trapping-in air bubbles. Also, because the linear grooves (14e) are not isolated but form a connected grid of grooves (114), the grid of grooves (114) can be formed by collective processing, and thus, the molding mold can be processed in a short time even in cases where lens elements (50) are small.

Description

technical field [0001] The present invention relates to a method of manufacturing a lens array having a plurality of lens parts and a molding die, and more particularly relates to a method of manufacturing a lens array and a molding die obtained by forming a resin transfer layer on a substrate. Background technique [0002] As a method of manufacturing a lens array in which a resin transfer layer is provided on a substrate, there is a method in which recesses are formed so as to surround each transfer part provided on a molding die to prevent the transfer material from spreading around. Specifically, a recess, that is, a cushioning portion, is provided around a ring-shaped spacer portion that surrounds a cavity portion for transfer, thereby preventing the resin from spreading outward, and an edge, a groove, that is, a resin stopper, is provided on the spacer portion. structure (refer to Patent Document 1). For reference, in Patent Document 1 figure 1 , 2 are appended to FI...

AI Technical Summary

Problems solved by technology

In addition, the buffer portion or overflow portion around the gasket portion, or the transfer mold used to obtain them is a depression that needs to be machined with an end mill or other cutting tools, and the processing of the transfer mold requires a long time.

In particular, the lens of the lens array is small, and when the integration degree of the lens array is high, the buffer part is also small, and the processing time of the transfer mold is significantly prolonged.

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