JP3912873B2 - Manufacturing method of Fresnel type mirror - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of manufacturing a Fresnel Mirror, more particularly to a method for producing Fresnel Mirror with improved mirror as glare due to multiple reflections do not occur.
[0002]
[Prior art]
FIG. 5 explains the principle of the Fresnel type mirror. FIG. 5A shows a longitudinal sectional view of a convex mirror Q formed of a part of a spherical surface, and FIG. 5B shows a function equivalent to this convex mirror Q. Only the mirror surface of the Fresnel mirror Qf is shown in a longitudinal sectional view.
The Fresnel type mirror Qf divides the convex mirror Q into a large number of rings q ₁ , q ₂ , q ₃ ,... Q _n concentric with the small disk q ₀ with respect to the central axis O. This is based on a mirror structure when q ₀ and rings q ₁ , q ₂ , q ₃ ,... q _n are rearranged in a planar shape as shown in FIG. The Fresnel mirror Qf formed in this way is attracting attention as a space-saving product because it is thinner and flatter than the convex mirror Q.
[0003]
FIG. 6 shows a specific example of the Fresnel mirror Qf using a transparent resin plate. The mirror body is composed of a transparent resin plate 1, and a plurality of annular grooves 2 with different diameters constituting the rings q ₁ , q ₂ , q ₃ ,... Q _n are concentrically around the central axis O on one side thereof. The reflective film 3 such as aluminum is deposited on the entire surface of the annular groove 2.
[0004]
However, the Fresnel type mirror Qf composed of the transparent resin plate 1 as described above has a phenomenon of multiple reflection with respect to the light SL incident on the mirror surface at a relatively small angle, and is viewed from the direction in which the light SL is incident. In this case, the mirror surface becomes clouded by glare and the reflected image incident from the opposite side is difficult to see.
That is, the annular groove 2 is formed so that the inclined surface 2a and the step surface 2b are L-shaped in the longitudinal section, and the inclined surface 2a serving as a mirror surface is the surface of the resin plate 1 as the annular groove 2 is located farther from the central axis O. The angle of inclination with respect to the direction increases sequentially, so that the area of the stepped surface 2b becomes wider as the annular groove 2 is farther from the central axis O.
[0005]
Therefore, as shown in FIG. 6, when sunlight SL is incident on the mirror surface at a small angle, part of the light incident on the resin plate 1 is incident on and reflected from the stepped surface 2b, and the reflected light further enters the inclined surface 2a. There is a phenomenon that the light is reflected multiple times and returns to the direction of the first incident again. The sunlight SL that has returned to the incident direction becomes glare that directly enters the human eye E, so that it becomes difficult to see the image light GL that is incident from the opposite side as indicated by a broken line.
[0006]
[Problems to be solved by the invention]
An object of the present invention is to provide a method for manufacturing a Fresnel Mirror which settings to avoid the Fresnel mirror peculiar glare phenomenon substantially.
[0007]
[Means for Solving the Problems]
The manufacturing method of the Fresnel type mirror of the present invention that achieves the above-described object is that the inclined surface (2a) and the stepped surface (2b) have a large number of annular grooves (2) having an L shape in the longitudinal section in order of diameter. In a method of manufacturing a Fresnel mirror in which a concentric transparent resin plate is installed in a vacuum deposition chamber and metal particles evaporated from a metal evaporation source are deposited on the resin plate, the metal evaporation source is disposed on the resin plate. And arranged on the extension line of the concentric axis O of the multiple annular grooves (2) and at a position closer to the resin plate side than the spherical center Os defining the Fresnel spherical surface based on the multiple annular grooves (2). Thus, the inclined surface (2a) of the annular groove (2) faces the linear flight direction of the metal grains, but the stepped surface (2b) is blocked by the inclined surface (2a). Reflection by depositing metal particles only on the inclined surface (2a) (3) is formed, in which further comprising coating paint surface (4) as a non-reflective layer on the outside of the reflective layer (3) and the stepped surface (2b).
[0008]
As described above, according to the manufacturing method of the present invention, only one inclined surface forming the annular groove in the longitudinal section L shape is covered with the metal reflection film, and the other step surface is not covered. be incident on the light stepped surface to the mirror at a small angle, that there is no necessity to step surface in the incident light is further reflected efficiency Fresnel mirror that Ru can be prevented occur glare phenomenon Can be manufactured well.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
1A and 1B illustrate a Fresnel mirror according to the present invention, in which FIG. 1A is a longitudinal sectional view of an essential part, and FIG. 1B is an enlarged view of a portion X in FIG.
1A and 1B, the main body of the Fresnel type mirror Qf is composed of a transparent resin plate 1, and a resin having excellent transparency such as polycarbonate, polyacryl, or polyethylene is used as the resin. ing. On one surface of the resin plate 1, a large number of annular grooves 2 having different ring-like diameters in plan view are arranged concentrically around the central axis O in order from the smallest diameter to the largest. The annular groove 2 is formed with a fine groove width, and the groove width is formed in the range of 0.01 to 1.0 mm, preferably 0.05 to 0.5.
[0010]
Each annular groove 2 has an L-shaped longitudinal section from an inclined surface 2a and a step surface 2b. Of the two surfaces 2a and 2b, the inclined surface 2a acts as a mirror surface, forms an inclination angle θa with respect to the surface direction of the resin plate 1, and the step surface 2b serves as a boundary wall with the adjacent annular groove 2 Thus, the inclination angle θb with respect to the surface direction of the resin plate 1 is set to be larger than the inclination angle θa. Moreover, although the inclined surface 2a is formed in a smooth surface, the stepped surface 2b does not need to be smooth, but is preferably a textured rough surface.
[0011]
Each inclined surface 2a corresponds to a small disk q ₀ or a ring q ₁ , q ₂ , q ₃ ,... Q _n separated from the convex mirror Q described in the principle diagram of FIG. Part. However, since these inclined surfaces 2a are formed with a very small width, they may be linear in the longitudinal section as shown. The inclination angle θa of the inclined surface 2a is increased in order as the diameter of the annular groove 2 is increased from the central axis O, and the depth (that is, the wall area) of the stepped surface 2b is increased accordingly.
[0012]
On the surface of the annular groove 2 forming the Fresnel mirror Qf of the present invention, as shown in FIG. 1B, a metal reflection film 3 is deposited only on the inclined surface 2a, and the stepped surface 2b is reflected on the surface. The film 3 is not deposited. Further, a paint layer 4 is applied as a non-reflective layer so as to cover the outside of the reflective film 3 and the stepped surface 2b.
In the Fresnel type mirror Qf of the present invention, as described above, the reflection film 3 is deposited only on the inclined surface 2a and is not provided on the step surface 2b. Therefore, sunlight SL is incident on the mirror surface at a relatively small angle. At the same time, even if a part of the light is incident on the stepped surface 2b, the light SL is not reflected on the stepped surface 2b and is absorbed in the stepped surface 2b. Therefore, the multiple reflection that has occurred in the conventional Fresnel mirror does not occur, and the incident light SL does not return to the original incident direction again, so that the glare phenomenon does not occur.
[0013]
Further, if the stepped surface 2b is processed into a textured rough surface, the effect of preventing glare can be further improved. That is, when the stepped surface 2b is smooth, reflection by so-called “total reflection” occurs even if the reflection film 3 is not provided, and it is difficult to avoid the influence of the total reflection. However, if the stepped surface 2b is roughened in a satin finish as described above, incident light can be diffused by the rough surface, so that the effect of preventing glare phenomenon can be further improved. .
[0014]
2 to 4 are schematic views for explaining an example of a method for producing a Fresnel mirror according to the present invention.
FIG. 4 is a cross-sectional plan view of a vacuum deposition apparatus 10 that vacuum-deposits a metal reflective film 3 on a resin plate 1. The vacuum deposition chamber 20 of the vacuum deposition apparatus 10 is decompressed to a high vacuum, and a metal evaporation source 30 for evaporating a metal such as aluminum or tin is provided therein.
[0015]
As the metal evaporation source 30, a point evaporation source that is as close as possible to the point is preferably used, and it is preferable to form a spherical evaporation source that is sufficiently smaller than the deposition distance. The evaporation method is preferably a heating method. For example, a resistance heating method in which a metal material is directly evaporated by energization, and an electron beam heating method in which an electron beam is irradiated on the surface of the metal material loaded in a crucible to evaporate are preferably used. . When the vacuum evaporation chamber 20 is depressurized to a high degree of vacuum and the metal is evaporated from the metal evaporation source 30, the evaporated metal particles fly linearly toward the resin plate 1 as shown by the broken lines, and the surface of the resin plate 1 To form a thin film.
[0016]
In the manufacturing method of the Fresnel type mirror according to the present invention, the metal evaporation source 30 is arranged as shown in FIGS. 2 and 3 with respect to the resin plate 1 on which the metal reflective film is coated.
In FIG. 2, the metal evaporation source 30 of the vacuum evaporation apparatus 10 is on an extension line L of the central axis O (perpendicular to the surface direction of the resin plate 1) of many annular grooves 2 concentrically arranged on the resin plate 1. It is arranged point O _M, moreover than spherical center Os defining the spherical surface of the Fresnel mirror Qf is located closer to the resin plate 1 side. The spherical center Os corresponds to the spherical center of the convex mirror Q (spherical surface) before separation into a large number of concentric rings q _n (corresponding to the inclined surface 2a) when the principle of the Fresnel mirror is explained in FIG. Is.
[0017]
The metal particles evaporated from the metal evaporation source 30 arranged in a vacuum as described above fly in a straight line as shown by broken lines in FIGS. Since the metal particles fly in a straight line in this way, the metal particles collide only with the inclined surface 2a of the annular groove 2 provided on the resin plate 1, and the stepped surface 2b collides with the inclined surface 2a. There is nothing to do. In this way, the inclination angle θb of the stepped surface 2b may be adjusted so that the metal particles are blocked by the inclined surface 2a.
[0018]
As described above, the metal evaporation source 30 is evaporated from the metal evaporation source 30 by arranging the metal evaporation source 30 in the relationship as shown in FIGS. 2 and 3 with respect to the inclined surface 2a and the step surface 2b of the annular groove 2 on the resin plate 1. The deposited metal particles are deposited so as to form the reflective film 3 only on the inclined surface 2a, not deposited on the stepped surface 2b, and the coating layer 4 is formed outside the reflective film 3 and the stepped surface 2b as shown in FIG. The Fresnel type mirror Qf of the present invention can be manufactured by coating the film .
[0019]
Moreover, by arranging as shown in FIGS. 2 and 3, it is possible to obtain a uniform vapor deposition distribution with respect to the annular groove 2 of the entire resin plate 1. In addition, when the metal evaporation source 30 is arranged as shown in FIG. 4, since a plurality of resin plates can be vapor-deposited simultaneously under the same conditions with a single vacuum vapor deposition apparatus, a maximum of six surfaces, upper, lower, left, and right are used. 6 resin plates can be processed simultaneously.
[0020]
【The invention's effect】
According to the onset bright as described above, only one of the inclined surface of the inclined surface and the step surface forming an annular groove in the longitudinal sectional L-shaped and coated with a metal reflective film, the other step surface so as not to cover Because it is configured, even if a part of the light incident on the resin plate at a small angle enters the step surface of the annular groove, the light will be absorbed without being reflected by the step surface, so glare It is possible to efficiently manufacture a Fresnel mirror that prevents the phenomenon from occurring.
[Brief description of the drawings]
FIGS. 1A and 1B illustrate a Fresnel mirror according to the present invention, in which FIG. 1A is a longitudinal sectional view of an essential part, and FIG. 1B is an enlarged view of an X part in FIG.
FIG. 2 is an explanatory view of a main part showing a method for manufacturing a Fresnel mirror of the present invention.
FIG. 3 is a longitudinal sectional view of an essential part showing a method for producing a Fresnel mirror of the present invention.
FIG. 4 is an explanatory view showing the entire manufacturing method of a Fresnel type mirror of the present invention.
FIGS. 5A and 5B are diagrams for explaining the configuration principle of a Fresnel mirror, where FIG. 5A is a longitudinal sectional view of a convex mirror, and FIG. 5B is a principle diagram of a Fresnel mirror corresponding to the convex mirror.
FIG. 6 is a longitudinal sectional view showing a main part of a conventional Fresnel type mirror.
[Explanation of symbols]
1 (transparent) resin plate 2 annular groove 2a inclined surface 2b stepped surface 3 reflective film 4 paint layer 10 vacuum deposition apparatus 20 vacuum deposition chamber 30 metal evaporation source

Claims (2)

  A transparent resin plate in which a large number of annular grooves (2) having an inclined surface (2a) and a stepped surface (2b) having an L shape in a longitudinal section are arranged concentrically in order of diameter is installed in a vacuum deposition chamber. In the method of manufacturing a Fresnel mirror in which metal particles evaporating from a metal evaporation source are deposited on the resin plate, the metal evaporation source is extended from the resin plate with the concentric axes O of the multiple annular grooves (2). The annular shape is arranged with respect to the linear flight direction of the metal particles by being arranged on a line and at a position closer to the resin plate side than the spherical center Os that defines the Fresnel spherical surface based on the multiple annular grooves (2). The inclined surface (2a) of the groove (2) faces, but the stepped surface (2b) is blocked by the inclined surface (2a), and metal particles are deposited only on the inclined surface (2a) for reflection. A film (3) is formed, and further, the reflective film (3) and the step surface (2b) Method for producing a Fresnel-type mirror covering paint surface (4) as a non-reflective layer on the outside. Wherein said resin plate around a metal evaporation source arranged plurality method of Fresnel mirror according to claim 1, the plurality of sheets of resin plates to vapor deposition under the same conditions at the same time.

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