JP5067122B2 - Perforated plate - Google Patents

Description

  The present invention relates to a perforated plate made of metal having a large number of through-holes and having excellent design properties.

Conventionally, metal perforated plates have been used in various fields. In recent years, as disclosed in Patent Document 1, by changing the pitch or size of the through holes formed in the perforated plate at a desired position of the perforated plate, a logo or mark is formed by the perforated plate. Attempts have been made to display a target pattern such as.
JP 2006-39187 A

Summary of the Invention

  The present invention has been made in view of such a background, and is a metal perforated plate in which a large number of through holes are formed, and provides a perforated plate having excellent design properties. Objective.

  The perforated plate according to the present invention includes a metal plate having a first surface and a second surface opposite to the first surface, and a plurality of through holes extending between the first surface and the second surface. A perforated plate including a formed first region and a second region, wherein a plurality of first holes are formed from the first surface side, and each first hole is formed from the second surface side. Correspondingly, a plurality of second holes are formed, and each first hole communicates with the second hole corresponding to the first hole, and the first hole and the second hole The through hole is formed, and the position in the thickness direction of the metal plate of the connecting portion between the wall surface of the first hole and the wall surface of the second hole is a through hole located in the first region; It differs between the through-hole located in a 2nd area | region, It is characterized by the above-mentioned.

  In the perforated plate according to the present invention, with respect to any one of the through hole located in the first region and the through hole located in the second region, the connecting portion is along the thickness direction of the metal plate. You may make it located in the middle of the 1st surface and the 2nd surface.

  Further, in the perforated plate according to the present invention, the opening area of the through hole located in the first region and the opening area of the through hole located in the second region are the same as each other in a front view. May be different from each other.

  Furthermore, in the perforated plate according to the present invention, either one of the opening area of the through hole located in the first region and the opening area of the through hole located in the second region is The opening area of the through hole located in the first region is smaller than the other of the opening area of the through hole located in the first region and the opening area of the through hole located in the second region. You may make larger than any one of a hole area and the opening area of the through-hole located in the said 2nd area | region.

  Further, in the perforated plate according to the present invention, the first region and the second region are adjacent to each other, and at least one of the first hole and the second hole is the first region and the second region. In both regions, the regions may be arranged at equal intervals along at least one direction.

  Furthermore, in the perforated plate according to the present invention, the through hole located in the first region and the through hole located in the second region correspond to the formation center position of each first hole and the first hole. The formation center position of the second hole to be made may coincide with the plate surface of the metal plate.

  Furthermore, in the perforated plate according to the present invention, the first hole tapers as it enters the metal plate from the first surface, and the second hole extends from the second surface to the metal plate. You may make it taper as it gets into.

  Further, in the perforated plate according to the present invention, the first area and the second area are adjacent to each other, the second area is an area occupied by the marking target pattern, an area that defines an outline of the marking target pattern, and a marking target You may make it be any one of the area | regions which the shadow of a pattern occupies.

  Hereinafter, an embodiment of a perforated plate according to the present invention will be described with reference to FIGS.

  1 to 8 are diagrams for explaining an embodiment of the present invention. 1 is a plan view of the perforated plate, FIG. 2 is an enlarged plan view showing a portion (ellipse portion) surrounded by a solid line in FIG. 1, and FIG. 3 is taken along the line III-III in FIG. FIG.

  As shown in FIGS. 1 to 3, the perforated plate 10 is composed of a metal plate 20 having a first surface 20a and a second surface 20b facing each other. In the present embodiment, the perforated plate 10 includes a perforated region 14 a and a non-perforated region 14 b, and the non-perforated region 14 b is located at the peripheral edge of the metal plate 20 as shown in FIG. On the other hand, the perforated region 14a is located at the center of the metal plate 20 and is surrounded by the non-porous region 14b. A large number of through holes 30 extending between the first surface 20 a and the second surface 20 b are formed in the perforated region 14 a of the metal plate 20.

  Such a perforated plate 10 is used, for example, as a speaker grille attached to a television or stereo speaker. As represented by the case where it is used as a speaker grille, the perforated plate 10 has, for example, a manufacturer name, a model number, etc. separately from the original function (for example, a function of protecting a speaker in the case of a speaker grill). Has a function of marking the marking object pattern 12.

  In the perforated plate 10 to be described below, the configuration of the through hole 30 formed in a part of the perforated region 14a is different from the configuration of the through hole 30 formed in other portions of the perforated region 14a. By doing so, the marking target pattern 12 such as a logo or a trademark can be extracted into the perforated region 14a so that the observer can visually recognize it. In particular, in the example described below, the perforated area 14a includes a first area 15a surrounding the sign target pattern 12 to be extracted, and the sign target pattern itself to be extracted adjacent to the first area 15a. 2nd area | region 15b which makes | forms the area | region which occupies. As shown in FIGS. 1 and 2, a large number of through holes 30 are formed in each of the first region 15a and the second region 15b. And the structure of the through-hole 30 formed in the 1st area | region 15a differs from the structure of the through-hole 30 formed in the 2nd area | region 15b. Hereinafter, the configuration of the through hole 30 will be described in detail.

  As shown in FIG. 2 and FIG. 3, a first hole (first recess, first hole) 32 is formed from the first surface 20 a side of the metal plate 20. Further, as shown in FIGS. 2 and 3, a second hole (second recess, second hole) 34 is formed from the second surface 20 b side of the metal plate 20. As shown in FIG. 3, each second hole 34 is provided so as to correspond to one first hole 32. Each first hole 32 and the second hole 34 corresponding to the first hole 32 communicate with each other, and the wall surface 32a of the first hole 32 and the wall surface 34a of the second hole 34 are circumferential. The connection part 36 is connected. As a result, a through hole 30 that penetrates the metal plate 20 is formed by the first hole 32 and the second hole 34.

  For example, when the perforated plate 10 is used as a speaker grille, the thickness of the metal plate 20 can be 50 μm or more and 500 μm or less, preferably 200 μm or more and 300 μm or less. Moreover, when the perforated plate 10 is used as a speaker grille, it is preferable that the aperture ratio in the front view, that is, the ratio of the area occupied by the aperture shape in the front view is set to 40% or more. Furthermore, when the perforated plate 10 is used as a speaker grill, the inner diameter of the through hole 30 formed in the metal plate 20 is usually 1 mm or less, and in many cases, 500 μm or less. In addition, when the perforated plate 10 has a function of marking the marking target pattern 12, it is preferable that the through hole 30 having a minute size is formed in order to enable fine marking.

  As shown in FIG. 2, in the present embodiment, in the field of view from the direction orthogonal to the plate surface of the metal plate 20, in other words, in a plan view of the metal plate 20 (for example, the field of view shown in FIG. 2). The first hole 32 has a circular shape on the first surface 20a. Similarly, in the present embodiment, in the field of view from the direction orthogonal to the plate surface of the metal plate 20, in other words, in the plan view of the metal plate 20, the second hole 34 is circular on the second surface 20b. have. That is, the opening edges of the first holes 32 and the second holes 34 on the surfaces 20a and 20b of the metal plate 20 have a circular shape. In addition, the circular shape here does not indicate only an exact circular shape, but is a concept including a substantially circular shape that can be produced when an attempt is made to produce a circular shape by etching using, for example, a photolithography technique. is there.

  Further, as shown in FIG. 3, the metal plate of the formation center positions L1c1 and L2c1 of the first holes 32 and the formation center positions L1c2 and L2c2 of the second holes 34 corresponding to the first holes 32. The amount of deviation along the 20 plate surface is zero. That is, with respect to the plurality of through holes 30 located in the first region 15a and the second region 15b, the formation center positions L1c1 and L2c1 of the first holes 32 and the second holes 34 corresponding to the first holes 32, respectively. The formation center positions L1c2 and L2c2 are coincident with each other on the plate surface of the metal plate 20. Further, in the present embodiment, the formation center positions L1c1, L1c2, L2c1, and L2c2 of the holes 32 and 34 forming the through hole 30 are arranged at equal intervals in the first region 15a and the second region 15b. ing.

  Here, the “formation center position” means the position of the center of the area occupied by the holes 32 and 34 on the surface of the metal plate 20 on the side where the holes 32 and 34 are formed. . Therefore, the formation center positions L1c1 and L2c1 of the first hole 32 having a circular shape on the first surface 20a are the center positions of the circles on the first surface 20a, and similarly, the second surface 20b has a circular shape. The formation center positions L1c2 and L2c2 of the second hole 34 are the center positions of the circles on the second surface 20b.

  Further, the term “match” or “equal interval” here is not strictly judged, and an error that may occur when the holes 32 and 34 are formed by etching using, for example, a photolithography technique. It is a concept that includes

  In the example shown in FIG. 3, the first holes 32 gradually taper as they enter the metal plate 20 from the first surface 20 a of the metal plate 20. That is, the cross-sectional area of the first hole 32 in the cross section along the plate surface of the metal plate 20 (the cross section orthogonal to the thickness direction of the metal plate 20) is from the first surface 20a side to the second surface 20b side. It gradually gets smaller toward you. Such a first hole 32 can be formed, for example, by etching the metal plate 20 from the first surface 20a side, as will be described later. Similarly, the second hole 34 gradually tapers as it enters the metal plate 20 from the second surface 20 b of the metal plate 20. That is, the cross-sectional area of the second hole 34 in the cross section along the plate surface of the metal plate 20 (the cross section perpendicular to the thickness direction of the metal plate 20) is from the second surface 20b side to the first surface 20a side. It gradually gets smaller toward you. Such a second hole 34 can be formed by etching the metal plate 20 from the second surface 20b side, for example, as will be described later.

  Here, since both the first hole 32 and the second hole 34 gradually taper inward in the thickness direction from the surfaces 20a and 20b of the metal plate 20, as shown in FIG. In the cross section orthogonal to the plate surface of the plate 20, the wall surface 32 a of the first hole 32 and the wall surface 34 a of the second hole 34 form an overhanging portion 37 that protrudes into the through hole 30. The connecting portion 36 between the wall surface 32 a of the first hole 32 and the wall surface 34 a of the second hole 34 described above is formed by the ridge line of the protruding portion 37 protruding into the through hole 30. Further, when viewed from the front (when the perforated plate 10 is viewed from the direction along the normal of the plate surface), the inner contour of the through hole 30 is the wall surface 32 a of the first hole 32 and the second hole 34. It is prescribed | regulated by the connection part 36 (ridgeline of the overhang | projection part 37) with the wall surface 34a. Therefore, the opening shape of the through hole 30 in a front view is a shape obtained by projecting the region surrounded by the circumferential connection portion 36 onto a surface along the plate surface of the metal plate 20. Further, the opening area of the through hole 30 in a front view is a projected area on a surface along the plate surface of the metal plate 20 in a region surrounded by the circumferential connection portion 36.

  By the way, as shown in FIG. 3, in the present embodiment, the thickness direction (metal) of the metal plate 20 of the connecting portion 36 between the wall surface 32a of the first hole 32 and the wall surface 34a of the second hole 34 is shown. The position in the direction along the normal of the plate surface of the plate 20 is different between the through hole located in the first region and the through hole located in the second region.

  Specifically, with respect to the through hole 30 located in the first region 15 a, the connecting portion 36 is intermediate between the first surface 20 a and the second surface 20 b of the metal plate 20 along the thickness direction of the metal plate 20. Is located. In the illustrated example, with respect to the through hole 30 in the first region 15a, the first hole 32 and the second hole 34 are formed to have the same size. Thereby, the connection part 36 is located in the middle of the 1st surface 20a and the 2nd surface 20b of the metal plate 20 along the thickness direction of the metal plate 20. As shown in FIG. Note that the “intermediate between the first surface and the second surface” is not strictly determined, and may occur when the holes 32 and 34 are formed by etching using, for example, a photolithography technique. It is a concept that includes a degree of error.

  On the other hand, with respect to the through hole 30 located in the second region 15b, the connecting portion 36 is located along the thickness direction of the metal plate 20 rather than between the first surface 20a and the second surface 20b of the metal plate 20. Close to the second surface 20b side. In the illustrated example, the first hole 32 is formed larger than the second hole 34 with respect to the through hole 30 in the second region 15 a. Thereby, the connection part 36 is located in the side closer to the 2nd surface 20b rather than the 1st surface 20b of the metal plate 20 along the thickness direction of the metal plate 20. As shown in FIG.

  Here, an example of a method for manufacturing such a perforated plate 10 will be described mainly with reference to FIGS. In addition, the manufacturing method demonstrated below is a manufacturing method using the etching using a photolithographic technique. Here, FIG. 6 is a figure for demonstrating the manufacturing method of a perforated board generally, FIG. 7 is a figure for demonstrating the method of forming a resist pattern in a metal plate, FIG. 8 is a metal plate. It is a figure for demonstrating the method to etch.

  As shown in FIG. 6, the method for manufacturing a perforated plate in the present embodiment includes a step of supplying a metal plate 20 extending in a strip shape and etching using a photolithography technique on the metal plate 20. The first hole 32 is formed on the first surface 20a side, and etching using a photolithography technique is performed on the metal plate 20 to form the second hole 34 on the second surface 20b side of the metal plate 20. And a step of performing. Each step will be described in more detail below. In the present embodiment, as described below, the first surface 20a and the second surface 20b of the metal plate 20 are simultaneously etched to form the first hole 32 and the second hole 34. The forming process is performed in parallel.

  As shown in FIG. 6, in the present embodiment, a wound body 22 is prepared by winding a metal plate 20 around a supply core 23. Then, as the supply core 23 rotates and the wound body 22 is rewound, the metal plate 20 extending in a strip shape is supplied as shown in FIG. The metal plate 20 is formed with a through hole 30 to form the perforated plate 10. As such a metal plate 20, a plate material (sheet material) made of stainless steel, copper, iron, aluminum or the like can be used.

  The supplied metal plate 20 is subjected to an etching process by an etching apparatus (etching means) 50. Specifically, first, a photosensitive resist material is applied on the first surface 20a of the metal plate 20 (on the upper surface of the paper in FIG. 7) and the second surface 20b, and the resist film 51a is formed on the metal plate 20. , 51b. Next, glass dry plates 53a and 53b that prevent light from being transmitted to the regions to be removed of the resist films 51a and 51b are prepared, and the glass dry plates 53a and 53b are disposed on the resist films 51a and 51b.

  Thereafter, as shown in FIG. 7, the resist films 51a and 51b are exposed through the glass dry plates 53a and 53b, and the resist films 51a and 51b are further developed. As described above, the resist pattern 52a (see FIG. 8) is formed on the first surface 20a of the metal plate 20, and the resist pattern 52b is formed on the second surface 20b of the metal plate 20.

  As a specific example, regions of the glass dry plates 53a and 53b that face the resist films 51a and 51b to be removed are made black, and visible light can be used as exposure light. In this case, visible light is absorbed by the black portions, so that light does not enter the regions to be removed of the resist films 51 a and 51 b, and the resist films 51 a and 51 b are not fixed on the metal plate 20. On the other hand, light is incident on regions where the resist films 51 a and 51 b should not be removed, and the resist films 51 a and 51 b in the regions are fixed on the metal plate 20. The unfixed resist films 51a and 51b are removed by, for example, hot water washing.

  Next, as shown in FIG. 8, using the resist patterns 52a and 52b formed on the metal plate 20 as a mask, the metal plate 20 is moved to the first surface 20a side by an etching solution (for example, ferric chloride solution) 57. Etching is performed from the second surface 20b side. In the present embodiment, the etching solution 57 is sprayed from the upper nozzle 55a of the etching apparatus 50 disposed above the conveyed metal plate 20 toward the first surface 20a of the metal plate 20 through the resist pattern 52a. Is done. At the same time, the etching solution 57 is sprayed toward the second surface 20b of the metal plate 20 from the lower nozzle 55b of the etching apparatus 50 disposed below the metal plate 20 to be conveyed through the resist pattern 52b. At this time, as shown by a dotted line in FIG. 8, erosion by the etching solution starts in a region of the metal plate 20 that is not covered with the resist patterns 52a and 52b. Thereafter, the erosion slightly proceeds not only in the thickness direction of the metal plate 20 but also in the direction along the plate surface of the metal plate 20. As described above, erosion by the etching solution proceeds from the first surface 20a of the metal plate 20 toward the second surface 20b to form the first hole 32. Similarly, the erosion by the etching solution is caused by metal. The second hole 34 is formed by proceeding from the second surface 20b of the plate 20 toward the first surface 20a. Finally, the first hole 32 and the second hole 34 communicate with each other, and the first hole 32 and the second hole 34 form a through hole 30 that penetrates the metal plate 20.

  Thereafter, the resist patterns 52a and 52b on the metal plate 20 are removed, and the metal plate 20 is washed with water. In this way, the perforated plate 10 in which the through holes 30 are formed in the metal plate 20 is obtained.

  The web-like perforated plate 10 extending in a belt shape thus obtained is conveyed to a cutting device (cutting means) 59 by a pair of conveying rollers 57 and 57 that rotate while holding the perforated plate 10. Is done. The supply core 23 described above is rotated via the tension (pulling force) acting on the perforated plate 10 by the rotation of the transport rollers 57 and 57, and the metal plate 20 is supplied from the wound body 22. ing. Although it is optional, by cutting the metal plate 20 (perforated plate 10) in which a large number of through holes 30 are formed into a predetermined length by a cutting device (cutting means) 59, the sheet-like perforated plate 10 is formed. Obtainable.

  Next, the operation of the perforated plate 10 as described above, in particular, the operation of marking the marking target pattern 12 will be described.

  As described above, such a perforated plate 10 can be used as a speaker grill. Then, the marking target pattern 12 can be marked as described below.

  First, the case where the perforated plate 10 is observed from the front direction, in other words, the case where it is viewed from the direction (a) of FIG. 3 will be described. Here, FIG. 4 shows the opening shape of the through hole 30 located in the first region 15a when viewed from the direction (a) of FIG. 3 and the second shape when viewed from the direction (a) of FIG. It is a figure which shows the opening shape of the through-hole 30 located in the area | region 15b.

  As described above, since the first hole 32 and the second hole 34 taper inward in the thickness direction from the surface of the metal plate 20 and communicate with each other, the opening of the through hole 30 in a front view is provided. The shape is a shape obtained by projecting a region surrounded by the circumferential connection portion 36 onto a surface along the plate surface of the metal plate 20. Therefore, as shown in FIG. 4, the opening shape of the through-hole 30 located in the 1st area | region 15a becomes circular shape. Similarly, the opening shape of the through hole 30 located in the second region 15b is circular.

  Here, as shown in FIGS. 3 and 4, in the present embodiment, the opening area of the through hole 30 located in the first region 15a in the front view is the through hole located in the second region 15b. It is the same as the opening area in the 30 front view. Further, as shown in FIG. 2, in the present embodiment, the first region 15a and the second region 15b are adjacent to each other. As shown in FIG. 2, the opening positions of the through holes 30 in the front view are arranged at predetermined intervals in both the first region 15a and the second region 15b.

  From the above, in the front view (view from the direction (a)), the through hole 30 in the first region 15a and the through hole 30 in the second region 15b are grasped by the observer as having the same configuration. Thus, the observer cannot recognize the boundary between the first region 15a and the second region 15b. As a result, the marking target pattern 12 cannot be recognized in the front view (field of view from the direction (a)).

  Next, a case where the perforated plate 10 is viewed from an oblique direction, for example, from the (b) direction in FIG. 3 will be described. 5 shows the shape of the through hole 30 located in the first region 15a when viewed from the direction (b) of FIG. 3 and the inside of the second region 15b when viewed from the direction (b) of FIG. It is a figure which shows the opening shape of the through-hole 30 located in FIG.

  When the direction in which the perforated plate 10 is observed is inclined along an arbitrary direction with respect to the normal line of the plate surface of the perforated plate 10, as shown in FIG. It will be observed as a shape. At this time, the inner diameters d1b and d2b of the through-hole 30 in the direction in which the surface along both the direction of observation and the normal line of the plate surface of the perforated plate 10 intersects correspond to the observed elliptical short axis. become. As the observing direction is greatly inclined with respect to the normal line of the plate surface of the perforated plate 10, the minor axis of the ellipse forming the observed aperture gradually becomes shorter.

  And when the direction to observe inclines beyond a certain angle with respect to the normal line of the plate surface of the perforated plate 10, the inner contour of the through-hole 30 to be observed is only the connecting portion 36 (ridge line of the overhang portion 37). Rather, the holes 32 and 34 are defined by the peripheral edge of the opening on the surface of the metal plate 20. That is, the “a certain angle” here means that the direction d connecting the opening peripheral edge of the holes 32 and 34 on the surface of the metal plate 20 and the connecting portion 36 in the cross section of FIG. 3 is the plate surface of the metal plate 20. It is an angle made with respect to the normal line. If the observation direction is further inclined with respect to the normal to the plate surface of the perforated plate 10 beyond this angle, the degree of decrease in the short axis with respect to the increase in the observation angle is accelerated.

  When observed from the direction (b), as shown in FIG. 3, the opening shape of the through hole 30 in the first region 15 a is defined by a circumferential connection portion 36. Then, as can be understood by comparing FIG. 4 and FIG. 5, the opening area of the through hole 30 in the first region 15 a when observed from the (b) direction is when observed from the (a) direction described above. Is slightly smaller than the aperture area. Accordingly, the amount of light that can be visually recognized through the through hole 30 in the first region 15a when observed from the (b) direction is determined via the through hole 30 in the first region 15a when observed from the (a) direction. It will be slightly lower than the amount of light that can be viewed.

  On the other hand, when viewed from the direction (b), as shown in FIG. 3, the opening shape of the through hole 30 in the second region 15b is at both ends along the observation direction (left and right direction in the plane of FIG. 3). Each of the holes 32 and 34 is defined by the opening peripheral edge on the surface of the metal plate 20. Then, as can be understood by comparing FIG. 4 and FIG. 5, the opening area of the through hole 30 in the first region 15 a when observed from the (b) direction is when observed from the (a) direction described above. It is much smaller than the opening area. Accordingly, the amount of light that can be visually recognized through the through hole 30 in the second region 15b when observed from the (b) direction is determined through the through hole 30 in the second region 15b when observed from the (a) direction. This is much lower than the amount of light that can be viewed.

  Here, the opening area of the through hole 30 in the first region 15a is compared with the opening area of the through hole 30 in the second region 15b. When the observation angle is inclined from the normal direction of the plate surface of the metal plate 20, while the opening shape of the through hole 30 is defined only by the connection portion 36, the opening area of the through hole 30 is Both the first region 15a and the second region 15b decrease with the same degree. In the illustrated example, the direction d connecting the opening peripheral edge of the holes 32 and 34 on the surface of the metal plate 20 and the connecting portion 36 penetrates the first region 15a more than the through hole 30 in the second region 15b. In the hole 30, the metal plate 20 rises from the plate surface. Accordingly, in the illustrated example, the observation direction is more than the direction d connecting the opening peripheral edge on the first surface 20a of the second hole 34 of the through hole 30 formed in the second region 15b and the connecting portion 36. When inclined with respect to the normal of the plate surface of the metal plate 20, the opening area of the through hole 30 in the second region 15b is greater than the degree of decrease in the opening area of the through hole 30 in the first region 15a. Then it gets smaller rapidly. For this reason, as the observation direction is inclined from the normal direction of the perforated plate 10, the amount of light visually recognized from the second region 15 b through the through hole 30 is the first region 15 a through the through hole 30. Accordingly, the amount of light that is visible from the first region 15b becomes smaller, so that the second region 15b is observed darker than the first region 15a.

  Thus, by observing the perforated plate 10 from an oblique direction, the observer can determine whether the first region 15a and the second region 15b are based on the difference between the brightness of the first region 15a and the brightness of the second region 15b. The boundary can be recognized and the marking target pattern 12 can be grasped. In particular, according to the present embodiment, as the observation direction is gradually tilted from the normal direction, the brightness of the first region 15a and the brightness of the second region 15b gradually vary greatly. . That is, as the observation direction is tilted from the normal direction, the marking target pattern 12 is clearly visible on the perforated plate 10 in a method with a very high change in design. The handle 12 can be extracted.

  As described above, according to the present embodiment, the opening area of the through hole 30 formed in the first region 15a and the through hole formed in the second region 15b according to the direction in which the perforated plate 10 is viewed. 30 opening areas vary independently. That is, depending on the direction in which the perforated plate 10 is viewed, the amount of light that can be seen through the through hole 30 formed in the first region 15a and the through hole 30 formed in the second region 15b. The amount of light that can be visually recognized changes independently. As a result, it becomes possible to recognize the boundary between the first area 15a and the second area 15b, and to indicate the marking target pattern 12 according to the arrangement of the first area 15a and the second area 15b. become. In particular, since the amount of light that can be viewed through the through hole 30 changes according to the viewing direction, the marking target pattern 12 can be marked by a variety of methods.

  Various modifications can be made to the above-described embodiment within the scope of the present invention. Hereinafter, an example of a modification will be described.

  In the above-described embodiment, the opening area of the through hole 30 located in the first region 15a and the opening area of the through hole 30 located in the second region 15b are the same in front view, and in perspective view. Although the example which made it mutually differ was shown, it is not restricted to this. For example, one of the opening area of the through hole 30 located in the first region 15a and the opening area of the through hole 30 located in the second region 15b is located in the first region 15a in the front view. The opening area of the through hole 30 located in the first region 15a is smaller than the other of the opening area of the through hole 30 and the opening area of the through hole 30 located in the second region 15b. You may make it become larger than any other of the opening area of the through-hole 30 located in the 2nd area | region 15b. As an example for embodying such a modification, in the above-described embodiment, the first hole 32 and the second hole 34 forming the through hole 30 in the second region 15b are slightly enlarged, so that the front view The opening area of the through hole 30 in the second region 15b may be slightly increased. Thereby, the opening area of the through-hole 30 in the 2nd area | region 15b can be made larger than the opening area of the through-hole 30 in the 1st area | region 15a in front view. Further, as described above, the opening area of the through hole 30 in the second region 15b is a through hole in the first region 15a in perspective (for example, when observed from the direction (b) in FIG. 3). Leave smaller than 30 aperture areas. As a result, in the front view, the portion of the marking target pattern 12 formed from the second region 15b is observed brightly, and conversely, in the perspective view, the portion of the marking target pattern 12 is observed darkly. it can.

  In the above-described embodiment, with respect to the plurality of through holes 30 located in the first region 15a and the second region 15b, the formation center positions L1c1 and L2c1 of the first holes 32 and the first holes 32 Although the example in which the formation center positions L1c2 and L2c2 of the corresponding second holes 34 coincide on the plate surface of the metal plate 20 has been shown, the present invention is not limited to this. Regarding the plurality of through holes 30 located in at least one of the first region 15a and the second region 15b, the formation center positions L1c1 and L2c1 of the first holes 32 and the second holes corresponding to the first holes 32 The formation center positions L 1 c 2 and L 2 c 2 of 34 may be shifted from each other on the plate surface of the metal plate 20.

  Furthermore, in the above-described embodiment, the example in which the first region 15a and the second region 15b in which the thickness direction position of the connecting portion 36 is different from each other is included in the perforated region 14a of the metal plate 20 is shown. Not limited. One or more regions where the thickness direction position of the connection part 36 of the through hole is different from the thickness direction position of the connection part 36 of the through hole 30 formed in the first region 15a and the second region 15b are metal It may be included in the perforated region 14 a of the plate 20.

  Furthermore, in embodiment mentioned above, the number of the 1st area | region 15a and the 2nd area | region 15b is not specifically limited, It can set suitably according to the marking target pattern 12. FIG.

  Furthermore, in the above-described embodiment, the first region 15a and the second region 15b are arranged adjacent to each other, and one of the first region 15a and the second region 15b (the second region 15b in the above-described embodiment) is included. Although the example which occupies the area | region which makes the marking object pattern 12 itself was shown, it is not restricted to this. For example, as disclosed in Japanese Patent Application Laid-Open No. 2006-39187, one of the first region 15a and the second region 15b is a region that forms an outline of the display target pattern 12, or a region that shades the display target pattern 12. May be occupied.

  Furthermore, in the above-described embodiment, the first surface 20a and the second surface 20b of the metal plate 20 are etched at the same time, and the first hole 32 and the second hole 34 are formed in parallel. However, it is not limited to this. Either one of the first hole 32 and the second hole 34 may be formed first, and then the other of the first hole 32 and the second hole 34 may be formed.

  Furthermore, although the example which supplies the metal plate 20 extended in strip | belt shape was shown in embodiment mentioned above, it is not restricted to this. The perforated plate 10 may be formed by supplying a sheet metal plate 20 and etching the metal plate 20.

  Furthermore, in the above-described embodiment, the example in which the opening shape of the through hole 30 is a circular shape in plan view is shown, but the present invention is not limited to this, and may have various shapes such as a quadrangle, for example. Good.

  Furthermore, although the some modification with respect to embodiment mentioned above was demonstrated, it can also apply with respect to embodiment mentioned above combining these modifications suitably.

FIG. 1 is a plan view showing an embodiment of a perforated plate according to the present invention. FIG. 2 is a partial plan view showing the perforated plate shown in FIG. 3 is a cross-sectional view taken along a line III-III in FIG. FIG. 4 is a diagram showing the shape of the through-holes observed from the direction (a) in FIG. FIG. 5 is a diagram showing the shape of the through-holes observed from the direction (b) of FIG. FIG. 6 is a diagram for explaining an example of a method for manufacturing the perforated plate shown in FIG. 1. FIG. 7 is a view for explaining a method of forming a resist pattern on a metal plate in the manufacturing method shown in FIG. FIG. 8 is a diagram for explaining a method of etching a metal plate in the manufacturing method shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Perforated board 12 Marking object pattern 15a 1st area | region 15b 2nd area | region 20 Metal plate 20a 1st surface 20b 2nd surface 30 Through-hole 32 1st hole 32a Wall surface 34 2nd hole 34a Wall surface 36 Connection part

Claims (7)

A metal plate having a first surface and a second surface opposite to the first surface;
A perforated plate including a first region and a second region each having a plurality of through holes extending between the first surface and the second surface, and intended to be observed from the first surface side Because
A plurality of first holes are formed from the first surface side,
From the second surface side, a plurality of second holes are formed corresponding to the respective first holes,
Each first hole and the second hole corresponding to the first hole communicate with each other, and the through hole is formed by the first hole and the second hole.
The position of the connecting portion between the wall surface of the first hole and the wall surface of the second hole in the thickness direction of the metal plate is a through hole located in the first region and a penetration located in the second region. A through hole located in the first region, and a direction connecting the connection edge of the first hole on the first surface of the first hole and the second region a through hole located, depends among,
The first region and the second region are adjacent to each other;
At least one of the first hole and the second hole is arranged at equal intervals along at least one direction in both the first region and the second region. > Perforated plate characterized by that. With respect to any one of the through-hole located in the first region and the through-hole located in the second region, the connection portion is formed on the first surface and the second along the thickness direction of the metal plate. The perforated plate according to claim 1, wherein the perforated plate is located in the middle of the surface. The opening area of the through hole located in the first region and the opening area of the through hole located in the second region are the same in front view and different from each other in perspective. The perforated plate according to 1 or 2. Either one of the opening area of the through hole located in the first region and the opening area of the through hole located in the second region,
In front view, the opening area of the through hole located in the first region and the opening area of the through hole located in the second region are smaller than the other,
3. The perspective view according to claim 1, wherein an opening area of a through hole located in the first region and an opening area of a through hole located in the second region are larger than each other in perspective. Perforated plate. With respect to the through hole located in the first region and the through hole located in the second region, the formation center position of each first hole and the formation center position of the second hole corresponding to the first hole are: , perforated plate according to any one of claims 1 to 4, wherein the match on the plate surface of the metal plate. The first hole tapers as it enters the metal plate from the first surface,
The perforated plate according to any one of claims 1 to 5 , wherein the second hole tapers as it enters the metal plate from the second surface. The first region and the second region are adjacent to each other;
The second region is a region occupied by the marking target pattern, the region forming the outline of the marking target pattern, and, of claims 1 to 6, characterized in that it is one of the area occupied by the shadow marking target pattern The perforated plate according to any one of the above.

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