JPS5840501A - Fresnel prism sheet - Google Patents

Abstract

PURPOSE:To make it possible to see one side from the other side through the titled sheet by making use of a reed screen effect, by forming plural small flat parts at equal intervals on a surface where projections consisting of small prisms are formed. CONSTITUTION:A Fresnel prism sheet 10 is formed like a thin plate consisting of a transparent body such as plastics and glass. Plural small prisms 12 are formed on the surface of said prism in multiple stages and ridgelines including vertexes 14 are paralleled to each other at prescribed intervals so as to make a right angle with the surface of paper. Each small prism 12 has an easy sloop 16 and a steep sloop 18 on one and the other sides of its vertex 14. Small flat parts 20 are formed between respective small prisms so as to be paralleled to the rear surface of the prism sheet 10 as slender parts expanded in the longitudinal direction of the small prisms. The sunlight projected from the outside of a room is totally reflected by the prism sheet when the height of the sun is high and penetrated into the room through the prism sheet when the height is low and, in addition, the outside of the room can be seen through the flat parts.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a Fresnel prism sheet in which a plurality of small prism protrusions are formed in multiple stages.

A nine-Fresnel prism sheet has been proposed in which a plurality of small prism protrusions are formed in multiple stages on one side of a transparent thin plate material.

This 7-Lenel grism sheet reflects or transmits this light depending on the angle of incidence of the small prism protrusion, so it can be used in five windows of a building when the small prism protrusion faces the outdoors in winter when the sun's altitude is low. sunlight can be transmitted indoors, and summer sunlight at high altitudes can be totally reflected. Even when the sun is at a high altitude and blocks direct sunlight, light from the sky (sky synchrotron radiation)
It is different from the conventional eaves and does not darken the interior of the room because it allows O to pass through.

However, since the Fresnel prism sheet refracts the passing light at any incident angle, it is not possible to see through the outdoors from indoors, and it is impossible for employees to secure visibility using fogged P glass. do not have.

The present invention takes the above-mentioned facts into consideration, and aims to obtain a Fresnel prism sheet that can see through one object from a distance of 10,000 to grasp the other object.

The Fresnel prism sheet according to the present invention has small prisms formed at the center and a plurality of nine small flat parts spaced apart from each other on a round surface, so that it is possible to see through the other from 10,000 to 10,000 using the curvature effect. There is. For this reason, the plurality of small flat portions are scattered in a dotted manner, and serve as blinds as mutually parallel lines.

The implementation of the present invention will be described below with reference to the drawings.

FIG. #11 shows a side view of the Fresnel prism sheet 1o according to the first embodiment of the present invention. This sheet 10 is formed into a thin plate shape 9 from a transparent material such as plastic or glass, and has a prism surface on the front surface and a flat surface on the back surface.

As shown in FIG. 2, a plurality of small prisms 12 are formed in multiple stages on the prism surface. The ridgelines of these small prisms 12 including the apex 14 are perpendicular to the plane of the paper, and are parallel to each other and spaced at a predetermined interval.

Each of these small prisms 12 has an apex 14.

In this embodiment, the apex angle θ of the gentle slope 16 is 2σ.

A small flat portion 2o is formed between these small prisms 12 and is parallel to the back surface of the prism sheet 1G. These small flat parts 2o are arranged in the valleys between the small prisms 12, that is, between the steep slopes 18 and the gentle slopes 16, and extend along the longitudinal direction of the small prisms 12 (direction perpendicular to the 1211m plane), and have a round face shape. It has become. Therefore, these small flat portions 2o are parallel to each other.

In this embodiment, the pitch of the φ prisms 12 is 1, and the width of the flat part is 0.1 to 0.3 m. It is preferable to attach the prism surface to the window of the building through the peripheral part with the prism surface facing outdoors.
8jJ) is also placed upwards.With this glazing, sunlight entering the room from outside is totally reflected as shown by arrow A in Figure 2 when the sun's altitude is high, blocking direct sunlight from entering the room. Things slow down. Also, sunlight indicated by arrow B, where the solar altitude is low, can be transmitted and taken into the room.

In this embodiment, the apex angle of the gentle slope 16 is 20", so reflection and transmission of sunlight are distinguished based on the height of the sun at noon on the spring and autumn equinoxes when the elevation angle φ is 55°. (35 north latitude
As a result, summer sunlight can be channeled through and only winter sunlight can be brought indoors.

When the outdoors can be seen from indoors, this embodiment has a plurality of small flat parts 20 formed at predetermined intervals, so these small flat parts 20 guide light from the outdoors into the room without refracting it. . Therefore, when looking outdoors from indoors in the direction of arrow C, a 1M resident can grasp the entire outdoor scenery that is partially transmitted through the plurality of small flat areas 20 (due to the so-called blind effect). You can see through the scenery.

It is amazing that in addition to this prism sheet 1G, conventionally used retractable blinds and the like can be installed together.

Next, Figure 3 shows a second embodiment of the present invention, in which the small flat portion 2o in this embodiment is not in the valley between the small prisms, but in the middle of the steep slope 18 of the small prisms. It is formed.

The small flat portion 2o in this practical yc is also extended in the longitudinal direction of the small prism 12, as in the previous embodiment, and the blind effect prevents the outdoor scenery from being seen through, as in the previous embodiment.

Note that the small flat portion 2o in this embodiment is not limited to the steep slope 18, but can also be provided on the gentle slope 16.

Next, in FIG. 4, #! of the present invention is shown. Three examples are shown.

In this embodiment, the small flat portion 2o is formed by removing the top of the small prism 120. Also in this embodiment, the small flat portion 2o extends in the longitudinal direction of the small prism 120, similar to the above embodiments. You can get V@pot.

In each of the above embodiments, the small flat portion 2o is the small prism 12.
The small flat portion according to the present invention may be any small flat portion that produces a blind effect, and is visible in the inner thickness direction of the prism sheet. In this case, it is also possible to achieve this by means of forming a plurality of circular, rectangular, etc. flat portions scattered over a wide area of the prism sheet.

In each of the above embodiments, ventilation may be provided by providing a number of small holes extending in the thickness direction of the prism sheet in the small flat portion.

As explained above, since the Fresnel prism sheet according to the present invention has a plurality of flattened portions, it has an excellent effect that the scenery from one side can be seen through the other side.

[Brief explanation of the drawing]

Figure 1111 is a side view showing the 7 Lenel prism sheet O No. 1 J [Figure 1] according to the present invention, Figure 2 is a partially enlarged view of Figure 1, and Figure 3.4 shows 12.3 implementation of the present invention. Happy to show moth 21
It is an enlarged view corresponding to i1. 10...) V-nel prism sheet, 12... Small prism, 16... Gentle slope% 18... Steep slope, 20...
...Tanbu Kodaira. Agent Benba Satoshi Nakajima Uki

Claims (1)

[Scope of Claims] (1) In a Fresnel prism sheet in which a plurality of small prism protrusions are formed and reflect or transmit light depending on the incident angle, large and small flat portions are spaced apart from each other on the surface on which the small prism protrusions are formed. A Fresnel prism sheet characterized by having multiple shapes. (2) A patented 7-Renell prism sheet characterized in that the small flat portions are elongated and parallel to each other. 0) The 7-renel purineau sheet according to claim 1 or 2, characterized in that the small flat portions are in the form of scattered dots. (4) The first aspect of the S-circle of the above-mentioned patent claim, wherein the uneven portion is formed in the valley portion of the plurality of small prism projections.
O Fresnel prism sheet as described in any of Items 1 to 3.