JPH02250083A - Marking sheet - Google Patents

Abstract

PURPOSE:To improve visibility by taking the smooth side of a sheet obtained by consecutively aligning fine, transparent or translucent triangular pyramids in the form of a plane as the front and providing a bar code and a mark thereon. CONSTITUTION:Each fine triangular pyramid is constituted of three right triangles alpha, beta, and gamma intersected orthogonally with each other. These pyramids are consecutively aligned on a transparent plastic sheet 1 to form a pattern. A metallic film 2 is applied to the front surface of the pattern by vacuum evaporation, and a bar code 3, etc., are printed on the smoother side of the pattern. When the surface where the bar code 3 is attached is used as the front, light made incident on the sheet 1 is reflected in a direction in parallel to the incident light at any angle with which the light is made incident on the sheet 1 and even if the surface is indefinite and bent, and the return light has strong directivity and great light intensity, unlike scattered light. Consequently, the bar code 3, etc., can be read at high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sign sheet used for barcode sheets, road sign sheets, etc.

[Prior art and its problems]

Recently, barcodes, which are convenient for computer management, have come to be widely used on products, etc. However, as shown in Figure 1(a), when the barcode attachment part is bent or There is a problem in that reading accuracy decreases when facing the sensor obliquely or when trying to detect information from a long distance, as shown in Figure (b).

In addition, as shown in Figure 1 (C), when road signs are attached to curved parts such as utility poles, or signs that are located diagonally to the line of sight, the light from car lights alone cannot be used at night. The problem was that it was hard to see.

[Problem to be solved by the invention]

Therefore, the present invention aims to provide a highly visible sign sheet that has improved the above-mentioned problems.

[Means to solve the problem]

In order to solve the above problems, the present invention provides three
It is a sheet in which transparent or translucent tiny triangular pyramids consisting of two right-angled triangular faces are continuously arranged in a planar manner, and the smooth side is the front side, and barcodes, signs, etc. are attached to that side. .

Coating the surface of the triangular pyramid with a metal film such as aluminum or chromium by vapor deposition or plating improves light reflection and further increases visibility. Furthermore, by making it of a film-like flexible material such as plastic, it can be used even on curved surfaces.

[For production]

When a surface with barcodes, labels, etc. attached is used as a front, no matter what angle the incident light enters the sheet surface, or even if that surface is an irregular curved surface, the reflected light will be incident parallel to the incident light. The returned light is reflected in the light direction, and unlike scattered light, the returned light has strong directionality, so the light intensity is high and barcodes etc. can be read with high accuracy.

〔Example〕

Fig. 2 is a plan view of an embodiment of the present invention, and Fig. 3 is its F-F
In the enlarged line cross-sectional view, a minute triangular pyramid S consisting of three mutually orthogonal right triangles α, β, and γ is shown on a transparent plastic sheet 1 (a transparent impact-resistant acrylic resin sheet was used in the example). A continuously aligned pattern is formed by embossing with a hot roll or the like, a metal film 2 of aluminum, chromium, etc. is vacuum-deposited on the surface, and a barcode 3 is printed on the smooth side.

Note that the groove spacing λ■7 and the groove depth (height of the triangular pyramid S) D are respectively expressed by the following equations. (See Figure 4) D = ae When the sign sheet configured as described above, that is, the smooth side of the plastic sheet 1 is facing up, is irradiated with light as shown in Figure 3, the shape of the surface of the sheet with the incident light is Regardless of the angle, the incident light g is refracted and reflected by the right triangular surface, and the output light returns to the plane of the incident light g and in the direction of the figure.

This function remains the same whether the plastic sheet 1 is curved into a convex or concave surface, as shown in FIG.

Therefore, visibility is improved when this sheet 1 is attached to an item as in the conventional example shown in Fig. 1(a), and when used as shown in Fig. 2(b), and detection errors are prevented. It can be prevented.

Further, when a label is attached instead of a bar code, the visibility is significantly improved even when it is attached to a curved surface as shown in the conventional example shown in FIG. 1(C).

FIG. 6 shows a different embodiment, in which a minute continuous pattern of triangular pyramids is embossed.

In this case, the thickness of the parts other than the continuous triangular pyramid pattern becomes thicker, and the incident light g is once refracted, but the outgoing light is also refracted, so that the same function as in the first embodiment is achieved.

In addition, 4 in FIG. 6 is a support body or an adhesive layer.

Further, the flat surface or triangular pyramid surface of the sign sheet of the present invention may be compounded with other materials for reinforcement, protection, or to enhance applicability for each purpose.

〔Effect of the invention〕

The sign sheet according to the present invention reflects incident light only in the original direction even if it is incident from any direction, so it can be seen even if it is casually attached to a curved surface such as a utility pole, guardrail pole, sign pole, etc. Highly sensitive labels can be obtained.

Furthermore, when used as a barcode sheet, even if the surface of the package is an amorphous curved surface, reflected light can be effectively returned to the original direction, thereby providing a barcode sheet with fewer errors.

Furthermore, by applying the present invention to large barcodes on automobile assembly lines and large electrical product assembly lines, it will be possible to identify and read them from a considerable distance with sensors without being affected by the location of the attachment. .

This application is also effective for vehicle identification at expressway gates.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of the use of a conventional sign sheet, FIG. 2 is an enlarged plan view of an embodiment of the present invention, and FIG.
4 is an explanatory diagram showing the state of the groove, FIG. 5 is an explanatory diagram showing the operation, and FIG. 6 is an enlarged sectional view of a different embodiment. 1...Plastic sheet 2...Metal film 3...Barcode 4...Support or adhesive layer S...Triangular pyramid diagram diagram diagram diagram diagram diagram

Claims (3)

[Claims] (1) A sheet in which transparent or translucent minute triangular pyramids made up of three right-angled triangular faces perpendicular to each other are continuously arranged in a planar manner.The smooth side is the front side, and barcodes and markings are placed on that side. A sign sheet featuring the following. (2) Claim 1 in which the triangular pyramid side surface is coated with a metal film such as aluminum or chromium by vapor deposition or plating.
Sign sheet listed. (3) The sign sheet according to claim 1 or 2, which is made of a flexible material such as plastic.