JPS59190832A - Continuous manufacture of fresnel lens - Google Patents

Abstract

PURPOSE:To continuously manufacture Fresnel lens by bonding and fixing a thin metal plate subjected to a Fresnel process in advance to the surface of a roller. CONSTITUTION:In providing continuously a Fresnel lens for a transparent synthetic resin plate 4 using a roller 3 attached with a thin metal plate 1 whose surface is subjected to a Fresnel processing 2, the transparent thin synthetic resin plate 4 heated to an adequate temperature is moved in a planar form and the roller 3 attached with the thin metal plate 1 having surface subjected to a Fresnel processing is pressed on the surface of the synthetic resin plate 4 moving. Whereupon, the Fresnel process pattern 2 of the metal plate 1 is carved on the plate 4 softened by heating at a suitable temperature as the roller 3 turns and cooled by the temperature of the metal plate 1 at the same time. A Fresnel lens of high accuracy can thus be exactly formed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for continuously manufacturing Fresnel lenses.

Traditionally, Fresnel lenses are produced by heating thin sheets of transparent synthetic resin to an appropriate temperature, pressing them one by one using a flat Fresnel-treated metal plate, and cooling them (commonly known as hot pressing), or by injection. They have been manufactured by molding or casting, but these methods are limited to flat plates of fixed length and cannot continuously manufacture long Fresnel lenses.

Research has also been conducted into manufacturing long Fresnel lenses by applying Fresnel processing to the surface of the roller by cutting, pressurizing grooves, etching, etc.; However, it was impossible to apply Fresnel processing.

Therefore, the present invention enables Fresnel lenses to be manufactured continuously by pasting and fixing a thin metal plate that has been Fresnel-processed in advance on the surface of a roller.The following describes the manufacturing method. Explain in detail.

As shown in FIG. 18, a thin metal plate 1 having one or more tubes subjected to Fresnel processing 2 is attached to the surface of the roller 3 shown in FIG.
(see Figure 3), and the other method is to apply the adhesive 7 to the surface of the roller 3 and then attach it (see Figure 3).
There is a method of fixing with nuts (see Fig. 4), and if both ends are fixed with bolts or bolts, it is desirable to provide a heat-resistant material between the roller 3 and the metal plate 1.

When applying adhesive to the surface of the roller 3, there are two methods: full-surface application and fixed-point application, but the effect is the same no matter which method you use.

A thin metal plate 1 whose surface has been subjected to Fresnel processing 2 in this way
When installing Fresnel lenses continuously on a transparent synthetic resin plate 4 using the roller 3, as shown in Fig. 5, the thin transparent synthetic resin plate 4 heated to an appropriate temperature is flattened. During the movement, when the roller 3 to which the thin metal plate 1 whose surface is subjected to Fresnel processing 2 is pressed is pressed against the surface of the moving synthetic resin plate 4, the roller 3 is rotated by the movement of the synthetic resin plate. The Fresnel processing 2 of the metal plate 1 is engraved on a thin transparent synthetic resin plate 4 that has been softened by heating at an appropriate temperature, and at the same time the temperature of the metal plate 1 itself changes.
Since the lens is cooled, a Fresnel lens with high precision can be manufactured without fail.

Also, since the synthetic resin plate 4 is only moved,
Fresnel lenses can be made continuously even with long objects like this.

As mentioned above, the present invention is an epoch-making method that allows Fresnel lenses to be manufactured continuously using a roller whose surface has been previously covered with a thin metal plate that has been subjected to Fresnel processing.

In addition, the Fresnel lens manufactured by the present invention is not only comparable to conventional lenses, but also
Since it can be manufactured continuously, it leads to cost reduction and can be provided in large quantities at low cost.

As is well known, Fresnel lenses are now widely used in various fields, and it is expected that the present invention will further increase their usage.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a metal plate with multiple cylinders subjected to Fresnel processing, Fig. 2 is a perspective view of the roller, Fig. 3 is a longitudinal cross-sectional view showing the state in which the metal plate is attached to the roller with adhesive, and Fig. 4
The figure is a longitudinal cross-sectional view showing a state in which a metal plate is removed with a fastener 6 such as a bolt or nut, and FIG. 5 is a diagram showing a state in which a Fresnel lens according to the present invention is manufactured. 1 is a metal plate, 2 is a Fresnel processing, 3 is a roller, 4 is a synthetic resin board, 5 is a shaft, 6 is a fastener, 7 is an adhesive, and 8 is a cushioning material. Patent applicant Noboru Hatano 5- Figure 1 Figure 3 Figure 2 Figure 4

Claims (1)

[Claims] A thin transparent synthetic resin plate heated to an appropriate temperature is moved in a certain direction, a thin metal plate with Fresnel processing is attached to one side of the synthetic resin plate, and a roller is brought into contact with the surface. A continuous manufacturing method for Fresnel lenses patented in which Fresnel lenses are continuously engraved on the synthetic resin plate by the pressing force of a rotating roller.