JP3108634B2 - Braille sign sheet and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Braille marking sheet using a photocurable resin and a manufacturing direction thereof.

[0002]

2. Description of the Related Art A conventional Braille marking sheet has been produced by embossing a metal plate or a resin plate having a Braille projection formed on a surface thereof together with paper through a roller. On the other hand, the braille formed by swelling the paper has a protruding portion which is difficult to read. Also, if you read with your finger many times,
There was a problem in terms of durability, for example, the protrusion was gradually dented and became unreadable.

Recently, as disclosed in Japanese Patent Application Laid-Open No. Hei 8-52929, a photocurable resin is printed on the surface of a sheet of paper or synthetic resin in accordance with the position of Braille, and a laser beam (usually an ultraviolet laser) is used. Light) is irradiated and cured to form a projection, and this projection constitutes Braille. In the Braille marking sheet thus formed, since the braille is made of a synthetic resin material, the durability of the protrusion is improved, and the disadvantage that the protrusion is dented and cannot be read can be improved. is there.

[0004]

However, the Braille marking sheet using the above-mentioned conventional photocurable resin has the following problems. First, prepare and arrange a sheet of paper or synthetic resin, then print the photocurable resin on the surface of the sheet according to the position of Braille, and then irradiate laser light to cure the photocurable resin Is required, which is troublesome. In addition, since the sheet and the projections forming Braille are basically separate members, they are initially adhered to the sheet by the adhesive force of the photocurable resin itself. There is also a problem that the protruding portion is peeled off when touching with a finger.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to solve the above-mentioned problems, and an object of the present invention is to provide a Braille sign sheet which can be easily manufactured and has high durability, and a method for manufacturing the same.

[0006]

The present invention has the following arrangement to achieve the above object. That is, the Braille marking sheet according to claim 1 is a Braille marking sheet comprising a sheet-shaped base material and Braille projections formed on the surface of the sheet-shaped base material, wherein the sheet-shaped base material and the Braille projection are light. It is characterized by being integrally molded using a photocurable resin by a molding method. According to this configuration, the sheet-shaped base material and the Braille projection can be integrally formed in the same process using the same photocurable resin.

A specific manufacturing method is to slice three-dimensional data of a Braille sign sheet into a plurality of cross-sections having a predetermined thickness parallel to the sheet-like base material, and to slice the three-dimensional data of each of the cross-sections. The shape data is obtained, and the surface of the photocurable resin liquid is irradiated with laser light from one of the end portions of the sheet-shaped base material or the Braille projections based on the shape data of the cross-sectional body to form a cross-sectional body. Are sequentially laminated while being cured.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a Braille marking sheet according to the present invention will be described below in detail with reference to the accompanying drawings. First, the configuration of the Braille marking sheet 10 will be described with reference to FIGS. The Braille marking sheet 10 includes a sheet-shaped base material 12 and a Braille projection 14 formed on the surface of the sheet-shaped base material 12. The feature of the present invention is that the sheet-shaped base material 12 and the Braille projections 14 are integrally formed by the photolithography method using the same photocurable resin.

Here, the optical shaping method is a technique for selectively curing a fluid material by light energy to accurately produce a three-dimensional object having a desired shape. This is a technique for irradiating a laser beam to perform molding. The principle is that the object is sliced at equal intervals on a computer based on the three-dimensional data of the object to create data of the cross-section. Next, the surface of the liquid photocurable resin is scanned with a laser beam based on the data of the cross section. As a result, the resin in the irradiated portion is thinned and a cured resin layer for the cross-sectional body data is formed. By repeating the steps up to the formation of the cured resin layer, the cured resin layers are laminated to form the three-dimensional object. The cured resin layer is extremely thin and has a thickness of about 0.1 to 0.4 mm, so that high-precision molding can be performed.

[0010] Moreover, the current stereolithography apparatus is completely automated. Therefore, three-dimensional CAD is used for object design.
By using (Computer-aided design), the data of the cross section can be easily created from the three-dimensional CAD data, and the created data of the cross section can be used in the optical shaping apparatus. Therefore, it is possible to carry out from design to manufacturing consistently.

Therefore, the sheet-shaped base material 12 having a thickness B of about 0.3 mm (which may be set to be larger than this thickness) and the diameter D formed on the surface thereof are about 1.4 mm.
A Braille projection 14 having a height C of about 0.2 to 0.6 mm in millimeters can be automatically formed with sufficient accuracy, and the sheet-shaped base material 12 and the Braille projection 14 can be formed of the same photocurable resin liquid. It becomes possible to integrally and continuously form the filled tank, so that it is not necessary to take a plurality of steps as in the conventional case because only one step is required, and the production can be performed easily. Also, instead of a structure in which the Braille projections 14 are adhered onto the sheet-like base material 12 as in a conventional Braille marking sheet using a photocurable resin, the sheet-like base material 12 and the Braille projections 14 have the same light-curing property. Since the Braille marking sheet 10 is manufactured by being continuously and integrally formed using the conductive resin, the Braille projections 14 do not in principle peel off from the sheet-like base material 12 even after long-term use.

Next, a manufacturing process of the Braille marking sheet 10 will be described with reference to FIGS. As described in the description of the stereolithography method, the Braille marking sheet 10 is designed by three-dimensional CAD as shown in FIG.
A plurality of cross sections SL _{1 to} S having a predetermined thickness d parallel to
L _n (n is a natural number of 2 or more) and sliced into each section S
The shape data (cross-sectional data) for each of L _{1 to} SL _n is obtained,
The information is stored in a storage unit (not shown) in the control unit 18 of the optical shaping apparatus 16 in FIG. The control unit 18 has a function of controlling a laser oscillator, a galvanomirror, and an elevator, which will be described later, and a function of performing data communication with CAD. Some stereolithography machines create cross-sectional data by themselves only by inputting three-dimensional CAD data.

When the optical shaping apparatus 16 is operated in this state, the laser beam 22 emitted from the laser oscillator 20 is supplied to the photocurable resin filled in the tank 30 by scanning means, for example, a galvano mirror 28 via mirrors 24 and 26. The surface of the resin liquid 32 is scanned to draw the shape of the cross-section SL1 for _one layer (for example, the lowermost layer). In this case, the portion where the laser beam 22 is irradiated to cure from a liquid to a solid, are more minute cross member SL ₁ is formed on the elevator 34 arranged in advance in the photocurable resin liquid 32 under the irradiated surface You.

Next, the elevator 34 moves downward by a further amount, and the upper surface of the formed cross-sectional body SL ₁ becomes the irradiation surface of the new laser beam 22. The laser shaping device 16 scans and irradiates the surface of the photo-curable resin liquid 32 with the laser beam 22 in the same manner based on the data of the cross section SL ₂ of the next layer, and the cross section SL
Form ₂ . In this manner, the braille projections 14 are integrally formed from the sheet-like base material 12 continuously based on the shape data of the cross sections SL _{1 to} SL _n to form the Braille marking sheet 10. At this time, in order to improve the durability of the Braille projections 14, the Braille projections 14 are formed solid (there is no hollow portion inside).

[0015] Finally, when finished form of the uppermost cross member SL _n takes out a braille indicia sheet 10 which is formed by moving upward the elevator 34 from the photocurable resin liquid within 32. After that, the taken-out Braille marking sheet 10 is washed and irradiated with light again to increase the hardness, thereby completing the work. Reference numeral 36 denotes a vertical movement mechanism for vertically moving the elevator 34. As an example, a motor 38 and a motor 38
And a screw rod 40 that is driven to rotate. Alternatively, a crane or the like may be used.

In the above-described embodiment, the Braille marking sheet 10 in which the Braille projections 14 are formed on one surface of the sheet-like base material 12 has been described as an example. As a result, as shown in FIG.
The Braille marking sheet 10 in which the Braille projections 14 are formed on both surfaces can also be easily formed in one continuous step. In addition, the data can be easily changed by combining the three-dimensional CAD and the optical shaping apparatus, so that the thickness of the sheet-like base material 12 and the diameter, height, and shape of the Braille projection 14 can be freely changed. There is also.

As the photo-curable resin, an ultraviolet-curable resin (for example, SCR-310, 700, 510, 750, manufactured by Nippon Synthetic Rubber Co., Ltd.) is usually used. Also, in the final stage, Braille marking sheet 1
Ultraviolet light is also used as the light to be irradiated after cleaning 0. In addition, it is also possible to manufacture a Braille marking sheet 10 having a different feel of a finger by properly using the various photocurable resins as described above.

As described above, various preferred embodiments of the present invention have been described. However, the present invention is not limited to the above-described embodiments, and many modifications can be made without departing from the spirit of the invention. Of course.

[0019]

By using the Braille marking sheet according to the present invention, the sheet-like base material and the Braille projection can be continuously and integrally formed using the same photocurable resin,
In principle, the braille projection does not peel off, so that there is an effect that durability is improved. In addition, according to the method for manufacturing a Braille sign sheet according to the present invention, the manufacturing process can be simplified and automated, and labor costs and the like can be reduced, and the product unit price can be reduced. In addition, there is an effect that once data is created, repetitive production becomes possible.

[Brief description of the drawings]

FIG. 1 is a plan view of a Braille marking sheet according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an enlarged view of a main part showing a state in which the Braille marking sheet of FIG. 1 is sliced into a plurality of cross sections.

FIG. 4 is an explanatory diagram showing a schematic configuration of an optical shaping apparatus for manufacturing the Braille marking sheet of FIG. 1;

FIG. 5 is a cross-sectional view of another embodiment of the Braille marking sheet according to the present invention.

[Explanation of symbols]

 10 Braille marking sheet 12 Sheet base material 14 Braille projection

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-7-261656 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B41J 3/32 B41M 1/00-3 / 16 G09B 21/02

Claims (2)

(57) [Claims] 1. A Braille marking sheet comprising a sheet-shaped substrate and Braille projections formed on the surface of the sheet-shaped substrate, wherein the sheet-shaped substrate and the Braille projections are made of a photocurable resin by a stereolithography method. A Braille marking sheet, which is integrally formed by using the following. 2. A sheet-like base material and manufacturing method of the braille indicia sheet consisting Braille protrusions formed on the surface of the base sheet, the three-dimensional data of the point-shaped marking sheet, and the sheet-like base material Along with slicing into a plurality of cross-sections having a predetermined parallel thickness, shape data for each of the cross-sections is obtained, and the cross-section is obtained from one end of the sheet-shaped base material or the Braille projection. A method for manufacturing a Braille marking sheet, comprising: irradiating a laser beam onto a surface of a photocurable resin liquid based on shape data of a body to sequentially cure and form a cross-section body;