Evaluation of Resin Molds Change in Design and Polymerization by Using a Wavefront Sensor

Kazumasa Tatsumi, Kazumasa Tatsumi, Kentaro Saeki, Shin Kubota, Yoshikatsu Kaneda, Kenji Uno, Kenji Uno, Kazuhiko Ohnuma, Kazuhiko Ohnuma, Tatsuo Shiina

2025

Abstract

Advances in molding technology have made it possible to produce plastic molded products with complex shapes. In contact lens manufacturing, a double-sided molding method using resin molds is employed, where the front and back designs are replicated through injection molding. However, shape changes in the resin molds caused by heat treatment (polymerization) during the manufacturing process affect lens characteristics. This study proposes a method using optical techniques to clarify the influence of mold design and polymerization on resin mold shapes. Five types of resin molds were measured using a wavefront sensor, which allows for high-accuracy, non-contact measurement. Wavefront aberrations and radii of curvature were evaluated, and results showed that polymerization caused slight deviations from the design values and changes in shrinkage rates. This method demonstrated its effectiveness in measuring and evaluating resin molds for contact lens production. Furthermore, the proposed method has wide-ranging applications, including quality control in lens manufacturing and evaluating the transfer accuracy of metal molds.

Paper Citation

in Harvard Style

Tatsumi K., Saeki K., Kubota S., Kaneda Y., Uno K., Ohnuma K. and Shiina T. (2025). Evaluation of Resin Molds Change in Design and Polymerization by Using a Wavefront Sensor. In Proceedings of the 13th International Conference on Photonics, Optics and Laser Technology - Volume 1: PHOTOPTICS; ISBN 978-989-758-736-8, SciTePress, pages 20-27. DOI: 10.5220/0013150400003902

in Bibtex Style

@conference{photoptics25,
author={Kazumasa Tatsumi and Kentaro Saeki and Shin Kubota and Yoshikatsu Kaneda and Kenji Uno and Kazuhiko Ohnuma and Tatsuo Shiina},
title={Evaluation of Resin Molds Change in Design and Polymerization by Using a Wavefront Sensor},
booktitle={Proceedings of the 13th International Conference on Photonics, Optics and Laser Technology - Volume 1: PHOTOPTICS},
year={2025},
pages={20-27},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0013150400003902},
isbn={978-989-758-736-8},
}

in EndNote Style

TY - CONF

JO - Proceedings of the 13th International Conference on Photonics, Optics and Laser Technology - Volume 1: PHOTOPTICS
TI - Evaluation of Resin Molds Change in Design and Polymerization by Using a Wavefront Sensor
SN - 978-989-758-736-8
AU - Tatsumi K.
AU - Saeki K.
AU - Kubota S.
AU - Kaneda Y.
AU - Uno K.
AU - Ohnuma K.
AU - Shiina T.
PY - 2025
SP - 20
EP - 27
DO - 10.5220/0013150400003902
PB - SciTePress