Precise Aspherical Plastic Lens for Electronic Appliances — Molding Technology and Applications —

Muranaka, Masayuki; Noro, Y.; Takagi, Matao; Wada, K.

doi:10.1007/978-94-011-3890-1_50

Cited by 2 publications

(3 citation statements)

References 2 publications

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“…The area where the on-axis pencil does not pass through is used for it. The distance between the aspherical lens (4) and the convex lens is so settled that the marginal rays may travel above the on-axis pencil at the aspherical lens (4). Although the other rays in this oblique pencil pass through the central part of the aspherical lens (4), the curvature given for the spherical aberration correction fits well for the correction of coma.…”

Section: Aspherical Optical Designmentioning

confidence: 98%

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Optical design of high-aperture aspherical projection lens

Osawa

Fukuda

Hirata

1991

1990 Intl Lens Design Conf

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Aspherical projection lens for large screen television has been designed with a peW idea. The designing process based on this idea is analysed. :L INTRODUCTIONAccording to the recent innovation in plastic molding technology for aspherical lenses, an unique lens system, actively using aspherical lenses has been apPariflg.A typical and successful example is the projection lens for a large screen television, which is expected to become the main stream for the coming HDTV era in the near future, because of its compactness, light weight, and proper luminance level.The design of such lens system is quite exhosting work because the limit of aberration correcting ability of aspherical lenses is inestimable and the shape of a designed aspherical lens are not always suitable for molding in consideration with the precision and the productivity.We have been strugling to find an efficient and explicit way in the aspherical optical design for projection lens. The results we have got so far are described here.

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Section: Aspherical Optical Designmentioning

confidence: 98%

“…Concerning the rays in the upper part of this pencil, they cause negative transeversal ray aberration on the screen, Another way to control their traveling direction is to utilize the marginal part of the aspherical lens (4). The area where the on-axis pencil does not pass through is used for it.…”

Section: Aspherical Optical Designmentioning

confidence: 99%

Optical design of high-aperture aspherical projection lens

Osawa

Fukuda

Hirata

1991

1990 Intl Lens Design Conf

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“…The technique of precision glass molding (PGM) has been developed for the manufacture of aspherical and irregular glass optics [37][38][39]. This technique is based on the softening of glass in its super-cooled liquid region which is above the glass transition temperature T g [40].…”

Section: Introductionmentioning

confidence: 99%

Precision glass molding: Toward an optimal fabrication of optical lenses

Zhang

Liu

2017

Front. Mech. Eng.

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It is costly and time consuming to use machining processes, such as grinding, polishing and lapping, to produce optical glass lenses with complex features. Precision glass molding (PGM) has thus been developed to realize an efficient manufacture of such optical components in a single step. However, PGM faces various technical challenges. For example, a PGM process must be carried out within the super-cooled region of optical glass above its glass transition temperature, in which the material has an unstable non-equilibrium structure. Within a narrow window of allowable temperature variation, the glass viscosity can change from 10 5 to 10 12 Pa$s due to the kinetic fragility of the super-cooled liquid. This makes a PGM process sensitive to its molding temperature. In addition, because of the structural relaxation in this temperature window, the atomic structure that governs the material properties is strongly dependent on time and thermal history. Such complexity often leads to residual stresses and shape distortion in a lens molded, causing unexpected changes in density and refractive index. This review will discuss some of the central issues in PGM processes and provide a method based on a manufacturing chain consideration from mold material selection, property and deformation characterization of optical glass to process optimization. The realization of such optimization is a necessary step for the Industry 4.0 of PGM.

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Precise Aspherical Plastic Lens for Electronic Appliances — Molding Technology and Applications —

Cited by 2 publications

References 2 publications

Optical design of high-aperture aspherical projection lens

Optical design of high-aperture aspherical projection lens

Precision glass molding: Toward an optimal fabrication of optical lenses

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