JP4484593B2 - Method of manufacturing a minimal mother die constituting pin, and method of manufacturing a mold using the pin - Google Patents

Description

  The present invention relates to a micro prism reflecting sheet that is attached to a license plate of a vehicle such as clothing, shoes, an automobile, or a bicycle, a sign such as a road sign, etc. in order to ensure traffic safety and smoothness.

The micro prism reflecting sheet has been widely used recently because it has a high retroreflective efficiency as compared with a sheet using a glass sphere.
The metal mold of the reflection sheet is manufactured by first processing a metal mold with a machine to machine a metal having a prism assembly surface, and then using this mother mold by electroforming.

A conventional matrix for manufacturing a reflective sheet is a triangular pyramid prism assembly surface by forming a V-shaped cutting groove on a plane of the surface constituting the matrix using a hard bit made of diamond or the like. Was forming.
Therefore, it has been difficult to give mirror surfaces to the inclined surfaces constituting the prism and to form the prism angle with high accuracy.
Further, when the microprism reflecting sheet is manufactured from the master die manufactured by the conventional method, the direction and the size of each inclined surface are constant, so that the reflection angle is constant. Therefore, it was difficult to pass JIS standards (for example, JIS Z9117) such as reflection luminance and observation angle characteristics of automobiles, bicycles, road signs, etc. with a single microprism reflection sheet.
Furthermore, since it was difficult to adjust the cutting depth of the mother die, only a micro prism reflecting sheet having a flat surface shape could be produced.

In order to solve the above problems, the invention of claim 1, the rod-shaped body and, possess a pyramidal prism portion formed at one end of the rod-shaped body, microprism reflective sheet manufacturing mold are arrayed In the manufacturing method of the minimum mother die constituting pin, the rod-shaped body is attached to a jig larger than the rod-shaped body and cut together with the jig to form a triangular pyramid prism portion at one end of the rod-shaped body. This is a manufacturing method of a minimum mother die constituting pin .

According to a second aspect of the present invention, in the manufacturing method of the minimal mother die component pin according to the first aspect, the minimal mother die component pin is obtained by mirror-treating the inclined surface constituting the triangular pyramid prism portion. This is a manufacturing method of a featured minimum mother die constituent pin.

According to a third aspect of the present invention, there is provided a method for producing a minimal mother block component pin according to claim 1 or 2, wherein the minimal matrix component pin is a minimal matrix component pin minimum characterized in that a rod-shaped body is a rectangular column. This is a method of manufacturing a mother die constituting pin.

According to a fourth aspect of the present invention, in the method of manufacturing the minimal matrix component pin according to claim 3, the minimal matrix component pin has a long side of a square cross section of the rod-shaped body of 0.9 mm or less. This is a manufacturing method of the minimum mother die constituting pin.

According to a fifth aspect of the present invention, there is provided a method of manufacturing a mold for manufacturing a microprism reflecting sheet using the minimum mother block constituting pins manufactured by the method according to any one of the first to fourth aspects. A method for producing a mold for producing a microprism reflecting sheet, wherein a plurality of pins having different prism shapes are arranged to form a mother die, and a die is produced from the mother die by electroforming.

According to a sixth aspect of the present invention, there is provided a manufacturing method of a mold for manufacturing a microprism reflecting sheet using the minimum mother die constituting pin manufactured by the method according to any one of the first to fourth aspects, wherein the pin is inclined. A method for producing a mold for producing a microprism reflecting sheet, wherein a plurality of arrangements constitute a mother die, and a die is produced from the mother die by electroforming.

According to the present invention, one minimal matrix component pin has one triangular pyramid prism portion, and a matrix having a prism assembly surface by arranging a plurality of minimal matrix component pins in combination. Can be configured.
Since various prism angle pins can be used together as the minimum matrix configuration pins, the minimum matrix configuration pins with various prism angles can be manufactured, and the minimum matrix configuration pins can be combined in a desired pattern to configure the matrix. Thus, various reflection angles can be given to one reflection sheet.
Further, since the mother die is configured by bundling the minimum mother die constituting pins, the reflection angle can be changed by bundling the mother die with a desired inclination angle.
Furthermore, the prism assembly surface is not limited to a flat surface but can be formed on an inclined surface or a curved surface.

  According to the novel method of the present invention, it is possible to form the minimal matrix mold pin with a high prism angle. In addition, mirror finishing such as lapping can be performed after cutting. Therefore, when a master block composed of very small pins manufactured by this method is used, a prism assembly surface with high prism angle accuracy and good specularity is formed.

A first embodiment of the present invention will be described with reference to FIGS.
Reference numeral 1 denotes a metal minimal matrix forming pin. The minimal matrix component pin 1 has a regular quadrangular prismatic rod-shaped body 3 and a cube-corner triangular pyramid prism portion 5 formed at one end of the rod-shaped body 3. The upper limit of one side of the regular square of the cross-section of the rod-shaped body 3, that is, one side of the long side, is preferably 0.9 mm or less. The lower limit is preferably 0.3 mm or more. In this embodiment, it is 0.5 mm.
The triangular pyramid prism portion 5 is formed by cutting one end of the rod-shaped body 3. The triangular pyramid prism portion 5 is composed of three inclined surfaces 9, 11, and 13. The first inclined surface 9 has a pentagonal shape, and the second inclined surface 11 and the third inclined surface 13 have a rectangular shape. All the inclined surfaces 9, 11, 13 share the vertex 15, and two of the three inclined surfaces 9, 11, 13 share one ridge line (one side).

  Reference numeral 17 denotes a perpendicular line that passes through the vertex 15 and extends to the rod-shaped body 3. In addition, the light reflection direction (optical axis) of the minimal matrix component pin 1 is indicated by an arrow. In this embodiment, the cutting angles of the inclined surfaces 9, 11, 13 of the minimal matrix component pin 1 are set to be the same. Therefore, the optical axis is not inclined, and the angle formed between the reflection direction and the perpendicular line 17, that is, the inclination angle (θ) is 0 °.

As shown in FIG. 3, the mother die is configured by bundling the minimal mother die constituting pins 1 having the triangular pyramid prism portion 5 and incorporating them into a square frame (not shown). Since the rod-shaped body 3 of the minimal mother die constituting pin 1 is a quadrangle, the mother die can be easily constructed by incorporating the minimal mother die constituting pin 1 into a square frame of a predetermined size.
FIG. 4 shows an example of a microprism reflecting sheet 19 manufactured from a mother die constituted by arranging 16 minimum mother die constituting pins 1. Naturally, this prism assembly surface 21 depends on the prism angle and surface properties of the triangular pyramid prism portion 5 of each individual minimum mother pin constituting pin 1.

As shown in FIG. 5, the triangular pyramid-shaped prism portion 5 of each of the minimum mother block constituting pins 1 is formed by fitting the rod-shaped body 3 into a hollow jig 23 and inclining the jig 23 at a predetermined angle. It is formed by placing it on the table 25 and setting it to a desired cutting angle, cutting it against the cutting surface 29 of the cutting tool 27, and applying mirror processing such as lapping. Therefore, despite the fact that one side of the regular square of the cross section of the rod-shaped body 3 is as small as 0.9 mm or less, the formed triangular pyramid prism portion 5 has a high prism angle and the inclined surfaces 9 and 11. 13 are mirror surfaces.
Therefore, the reflection sheet 19 shown in FIG. 4 has a high prism angle accuracy, and has an aggregate surface of prisms whose inclined surfaces are mirror surfaces.

A second embodiment of the present invention will be described with reference to FIGS.
FIG. 6 (1) shows the minimal mother block constituting pin 1 (normal pin) described in the first embodiment. FIG. 6 (2) shows another minimal mother die constituting pin 31 (inclined pin).
The minimum mother die constituting pin 31 has a cutting angle of the inclined surface 9 cut deeper than cutting angles of the other inclined surfaces 11 and 13, and an inclination angle θ in the reflection direction is 10 °.
FIG. 7 shows an example in which the inclined pins 31 are combined and bundled. When combined in this way, the reflection angle can be widened in the vertical and horizontal directions as seen from the side view. Therefore, prism aggregate surfaces having various reflection angles can be easily formed on the surface of one microprism reflection sheet.
Needless to say, the normal pin 1 and the inclined pin 31 may be used in combination.

A third embodiment of the present invention will be described with reference to FIGS.
FIG. 8 shows an example in which the minimal matrix component pins 1 (ordinary pins) described in the first embodiment are bundled with an inclination of δ = 10 °. By tilting in this way, the reflection angle can be easily changed without using a pin whose reflection direction is not inclined.
FIG. 9 shows a prism assembly surface of a reflective sheet manufactured from four master dies that are configured by tilting the minimal mother die constituent pins 1 (normal pins) vertically and horizontally δ = 10 °. As shown by the arrow, the minimum mother block constituting pin 1 is tilted 10 ° to the left when configuring the prism assembly surface 33, and tilted upward 10 ° when configuring the prism assembly surface 35. When constructing 37, it is tilted 10 ° to the right, and when composing the prism assembly surface 39, it is tilted 10 ° to the right.

FIG. 10 shows an example in which a plurality of minimal matrix constituent pins 1 are bundled by shifting in the vertical direction. Reference numeral 33 indicates a line including the apex 15 of the triangular pyramid prism portion 5 of each minimal matrix constituent pin 1. This line 41 is inclined as can be seen. The corresponding line 43 in FIG. 8 is a horizontal straight line that is not inclined.
When the mother die is manufactured by machining, it is difficult to change the cutting depth. However, in the present invention, since the mother die is configured by arranging the minimal mother die constituting pins 1, as shown in FIG. By changing the bundling position in this way, the depth of the mold manufactured from the mother mold can be freely adjusted.
Therefore, the prism assembly surface is not limited to a flat surface, and can be formed on an arbitrary surface shape such as an inclined surface or a curved surface.

Although the embodiment of the present invention has been described above, the specific configuration of the present invention is not limited to this embodiment, and even if there is a design change or the like without departing from the gist of the present invention. Included in the invention.
For example, the rod-shaped body is not limited to a quadrangular prism but may be a triangular prism or a cylinder. Also, the prism shape described above is only an example.
Furthermore, the material of the minimum mother die constituting pin 1 is not limited to metal, and the same material as that constituting the conventional mother die can be used as it is. Therefore, it goes without saying that a conventionally known method can be used as it is for the manufacturing process of the micro prism reflecting sheet after the mother die is configured by arranging the minimal mother die constituting pins 1.

If a microprism reflective sheet is manufactured using the minimal matrix mold pins of the present invention, the reflection characteristics can be easily improved. Moreover, a microprism reflecting sheet corresponding to an arbitrary surface shape can be manufactured.
Conventionally, reflectors used for automobiles have produced molds for each model, but microprism reflective sheets that pass the automotive reflection standards have flexibility such as polycarbonate or acrylic resin. If it is made of resin, it can be fixed or bonded regardless of the surface properties of the tail lamp or the like.

It is a perspective view of the minimum mother mold | type component pin which concerns on embodiment of this invention. FIG. 2 is a top view and a side view of the minimal mother die constituting pin of FIG. 1. It is explanatory drawing of the 1st arrangement | sequence method of a minimum mother mold | type component pin. An example of a microprism reflecting sheet manufactured from a mother die configured by arranging extremely small mother die constituting pins is shown. It is explanatory drawing of the manufacturing method of a minimum mother mold | type component pin. It is a comparison figure (a top view, a side view, and a sectional view) of a normal pin and an inclined pin. It is explanatory drawing (a top view and a side view) of the 2nd arrangement | sequence method of a minimum mother mold | type component pin. It is explanatory drawing (side view) of the 3rd arrangement | positioning method of the minimum mother mold | type component pin. It is the upper side figure and side view of the prism assembly surface which were manufactured from the mother die comprised by inclining the minimum mother die component pin. It is explanatory drawing (side view) of the 4th method of arrangement | positioning of a minimum mother type | mold structural pin.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Minimatrix type | mold pin 3 Rod-shaped body 5 Triangular pyramid prism part 9,11,13 Inclined surface 15 Apex 17 Perpendicular line 19 Reflection sheet 21 Prism assembly surface 23 Jig 25 Inclined base 27 Cutting tool 29 Cutting surface 31 Minimal mother die structure Pin 41, 43 wire

Claims (6)

In a manufacturing method of a minimum mother die constituting pin having a rod-like body and a triangular pyramid-shaped prism portion formed at one end of the rod-like body and constituting a mother die of a microprism reflective sheet manufacturing die. ,
A method for producing a minimal mother block constituting pin comprising attaching a rod-shaped body to a jig larger than the rod-shaped body and cutting the rod-shaped body together with the jig to form a triangular pyramid prism portion at one end of the rod-shaped body.   2. The method of manufacturing a minimal matrix mold pin according to claim 1, wherein the minimal matrix mold pin has a mirror-finished inclined surface constituting the triangular pyramid prism portion. How to make a pin.   3. The manufacturing method of a minimum mother mold component pin according to claim 1, wherein the minimum mother block component pin is a quadrangular prism.   4. The manufacturing method of a minimal matrix component pin according to claim 3, wherein the minimal matrix component pin has a long side of a square cross section of a rod-shaped body of 0.9 mm or less. Method.   5. A method for manufacturing a mold for manufacturing a microprism reflecting sheet using a minimal matrix-shaped component pin manufactured by the method according to claim 1, wherein pins having different prism shapes of triangular pyramid prism portions are used. A method for producing a mold for producing a microprism reflecting sheet, wherein a plurality of arrangements constitute a mother die, and a die is produced from the mother die by electroforming.   In the manufacturing method of the metal mold | die for microprism reflective sheet manufacture which uses the ultra small mother block structure pin manufactured by the method in any one of Claim 1 to 4, in the state which inclined the pin, it arranged in multiple numbers and the master block was arranged. A method for producing a mold for producing a microprism reflecting sheet, characterized in that a mold is produced from the mother die by electroforming.

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