JP5045935B2 - Key top member, manufacturing method thereof, and electronic apparatus using the same - Google Patents

Description

  The present invention belongs to the technical field of key sheets used in various electronic devices including so-called mobile devices such as mobile phones and personal digital assistants (PDAs).

  Conventionally, this type of mobile device has been required to be lighter, smaller, and thinner, and a key sheet that can be used instead of a push button switch is used as one of these requirements. The key sheet is an arrangement of a large number of switch operation keys on a single sheet surface, and is supplied as a component constituting a mobile device. As one of such key sheets, there is one in which an etching product obtained by forming a letter by etching on a metal thin plate member is used as a key top member.

JP-A-8-7691

  The key top member made of a metal plate made of the etching product as described above expresses characters and the like by an etching portion that is penetrated by a predetermined punching pattern. Therefore, depending on the type of letters, numbers, symbols, figures, etc., it is necessary to connect the floating island part or weak part to the outer part with a bridge. I couldn't see it. Therefore, it is conceivable to form a floating island by pasting a film in advance on one side of the thin plate member and etching from the opposite side of the film. There is a problem that it is difficult to create a character having a width portion.

  The present invention has been made in view of the above-described problems, and the object of the present invention is a key that makes a bridge portion in a character or other pattern unobtrusive while being an etching product made of a metal plate. The object is to provide a top member, and also to provide a manufacturing method thereof and an electronic device using the same.

  In order to achieve the above object, a key top member according to the present invention is a metal in which a plurality of display portions made up of letters, numbers, symbols or figures formed as a punching pattern by etching are respectively arranged at predetermined positions. A key top member made of a thin plate member and used as a push button portion in a key sheet of an electronic device, wherein at least one display portion has a floating island portion supported by a bridge portion connected to the periphery, and the bridge The portion is formed by half-etching from at least one surface, and a step is provided on the boundary between the bridge portion and the floating island portion and the boundary on the half-etched surface side.

And the manufacturing method of the keytop member which concerns on this invention is a manufacturing method of the keytop member which forms a bridge | bridging part only by etching from one side among the above keytop members, Comprising: The next process is performed in order. It is characterized by performing.
(1) A photosensitive resist is applied to both surfaces of a thin plate member, and a predetermined pattern plate is used, and an opening portion is provided on both sides of the portion to be a punched portion and an opening is provided only on the other surface in a portion to be a bridge portion. Forming a resist pattern of a predetermined shape having a portion.
(2) A step of performing etching with a corrosive solution from both surfaces of a thin plate member on which a resist pattern having a predetermined shape is formed, penetrating the punched portion and forming a bridge portion on the other surface side.
(3) A step of removing the resist pattern.

The key top member manufacturing method according to the present invention is a key top member manufacturing method in which the bridge portion is formed by etching only from one side of the above key top members, and the following steps are sequentially performed. It is characterized by performing.
(1) A photosensitive resist is applied to both surfaces of a thin plate member, and a predetermined pattern plate is used, and an opening portion is provided on both sides of the portion to be a punched portion and an opening is provided only on the other surface in a portion to be a bridge portion. A step of attaching a re-peelable film to the other surface having no opening corresponding to the bridge portion after forming a resist pattern of a predetermined shape having a portion.
(2) A resist pattern having a predetermined shape was formed on both sides, and the first etching process using a corrosive solution was performed on a thin plate member formed by attaching a film on the other side until reaching a thickness that left a bridge portion. Then, the process of peeling the film in the other side.
(3) A step of covering one surface side having an opening corresponding to the bridge portion with an etching resistance layer from above the resist patterning.
(4) A step of performing a second etching process using a corrosive liquid on the thin plate member provided with the etching resistance layer and penetrating the punched portion.
(5) A step of peeling the etching resistance layer and the resist pattern.

The key top member manufacturing method according to the present invention is a key top member manufacturing method in which the bridge portion is formed by etching only from one side of the above key top members, and the following steps are sequentially performed. It is characterized by performing.
(1) A photosensitive resist is applied to both surfaces of a thin plate member, and a predetermined pattern plate is used, and an opening portion is provided on both sides of the portion to be a punched portion and an opening is provided only on the other surface in a portion to be a bridge portion. Forming a resist pattern of a predetermined shape having a portion.
(2) A step of performing the first etching process with the corrosive liquid from both surfaces of the thin plate member on which the resist pattern having a predetermined shape is formed until the portion is penetrated and the bridge portion is formed on the other surface side. .
(3) A step of covering one surface side having an opening corresponding to the bridge portion with an etching resistance layer from above the resist patterning.
(4) A step of performing a second etching process using a corrosive liquid on the thin plate member provided with the etching resistance layer and penetrating the punched portion.
(5) A step of peeling the etching resistance layer and the resist pattern.

The key top member manufacturing method according to the present invention is a key top member manufacturing method in which the bridge portion is formed by etching only from one side of the above key top members, and the following steps are sequentially performed. It is characterized by performing.
(1) A photosensitive resist is applied to both surfaces of a thin plate member, and a predetermined pattern plate is used, and an opening portion is provided on both sides of the portion to be a punched portion and an opening is provided only on the other surface in a portion to be a bridge portion. A step of applying a re-peelable film to one surface having an opening corresponding to the bridge portion after forming a resist pattern of a predetermined shape having a portion.
(2) Depth in the thickness direction of the first etching process with a corrosive solution on a thin plate member in which a resist pattern having a predetermined shape is formed on both surfaces and a removable film is attached to one surface The process which peels the film which can be re-peeled after performing until it becomes predetermined amount.
(3) A step of covering the other surface side having no opening corresponding to the bridge portion with an etching resistance layer from above the resist patterning.
(4) A step of performing a second etching process using a corrosive liquid on the thin plate member provided with the etching resistance layer, penetrating the punched portion and forming a bridge portion on the other surface side.
(5) A step of peeling the etching resistance layer and the resist pattern.

Moreover, the manufacturing method of the keytop member which concerns on this invention is a manufacturing method of the keytop member which forms a bridge | bridging part by the etching from both surfaces among above-mentioned keytop members, Comprising: The following process is performed in order. A method for manufacturing a key top member.
(1) A photosensitive resist is applied to both surfaces of the thin plate member, and a resist pattern having a predetermined shape having openings on both surfaces is formed in both the portion to be a punched portion and the portion to be a bridge portion using a predetermined pattern plate. Process.
(2) A step of performing a first etching process using a corrosive solution from both surfaces of a thin plate member on which a resist pattern having a predetermined shape is formed to a thickness that leaves a bridge portion.
(3) A step of covering both surfaces with an etching resistance layer while leaving only one of the openings corresponding to the extracted portion.
(4) A step of performing a second etching process with a corrosive liquid on the thin plate member provided with the etching resistance layer, penetrating the punched portion and forming a bridge portion leaving the middle in the thickness direction.
(5) A step of peeling the etching resistance layer and the resist pattern.

  The electronic device according to the present invention is an electronic device using a key sheet instead of the push button switch, and is characterized in that the above-described key top member is used as a push button portion in the key sheet.

  By configuring as described above, the key top member of the present invention is supported by a bridge portion connected to the periphery among a plurality of display portions made up of letters, numbers, symbols, or figures formed as a punching pattern by etching. In the display part with floating island part, the bridge part that supports the floating island part is formed by half etching from at least one, so the bridge part becomes inconspicuous, so the outline of the display part is clear It will be neat and easy to see.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a plan view schematically showing an example of a key top member according to the present invention.

  The key top member 1 in FIG. 1 is a metal thin plate used as a push button portion in a key sheet of a cellular phone, and is composed of a plurality of letters, numbers, symbols or figures formed as a cut pattern by etching corrosion. Each of the display units 3 is arranged at a predetermined position. In FIG. 1, 3a is a character, 3b is a number, 3c is a symbol, and 3d is a figure. Although the actual key top member 1 has more display parts, FIG. 1 shows a simplified one.

  As illustrated in FIGS. 2 to 4, the key top member 1 has at least one or more display units 3 (numbers “8”, “4”, and “9” in FIGS. 2 to 4) around the display (display unit). A floating island portion 4 supported by a bridge portion 5 connected to a portion other than letters, numbers, symbols, or figures), and the bridge portion 5 is formed by half etching from at least one surface, and the floating island portion is formed on the surface side. A step is provided at the boundary between 4 and the surrounding area. The floating island portion is a region that is surrounded by a contour line (outline) independently from the periphery of the display unit and includes a punched portion and a bridge portion around the periphery. “4, 6, 8, 9, 0”, the symbol “#”, and the characters “O, ha” each have a floating island portion.

  As shown in FIG. 2, the numeral “8” in the key top member 1 has two floating island portions 4, and these floating island portions 4 are supported by a bridge portion 5 connected to the periphery. FIG. 3 shows the numeral “4” in the key top member 1, and the floating island portion 4 is supported by two bridge portions 5. Although it is possible to support the floating island portion 4 with one bridge, it is preferable that the bridge is supported by two or more bridges in consideration of strength. Moreover, you may provide a bridge also other than the floating island part 4 like the number "9" in the keytop member 1 shown in FIG.

  In the key top member 1, as shown in FIG. 5, the bridge portion 5 is formed by half etching. In the case shown in FIG. 5, the bridge portion 5 is left on the lower surface side by half etching from the upper surface of the thin plate member 2. Here, the upper surface means a surface on which characters or the like represented on the member can be read correctly, and the lower surface means a surface on which the characters or the like represented on the member are reversed. As described above, since the bridge portion 5 is provided on the lower surface side, the bridge portion 5 has steps on the upper surface side at the boundary with the floating island portion 4 and the boundary with the periphery of the display portion. Can be seen in a state where the outline is connected without interruption at the bridge portion 5. Further, the bridge portion 5 is formed by a surface that is lowered from the upper surface, so that the bridge portion 5 becomes inconspicuous.

  FIG. 6 shows a shape in which the bridge portion 5 is left on the upper surface side by half etching from the lower surface of the thin plate member 2. In this case, the bridge portion 5 remains on the upper surface side. However, the bridge portion 5 can be made thinner than the etching of the normal punching pattern by half etching, and the width of the bridge portion 5 is made smaller than the line representing the character or the like. The bridge portion 5 can be made inconspicuous by setting it thin.

  FIG. 7 shows a shape in which the bridge portion 5 is left in the middle in the thickness direction by half etching from the upper and lower surfaces of the thin plate member 2. In this case, the bridge portion 5 has a step formed at the boundary between the floating island portion 4 and the periphery on the upper surface side, so that the display portion can be seen in a state where the outline is connected without being interrupted by the bridge portion 5. The portion 5 can be made thin, and the bridge portion 5 can be made inconspicuous by setting the width of the bridge portion 5 to be narrower than a line representing characters or the like.

  The key top member of the present invention is a thin plate member made of stainless steel, iron, iron alloy, copper alloy, or the like, and a metal plate having a thickness of about 0.02 to 0.3 mm that meets a desired specification. Used as Then, a plurality of display portions are formed at predetermined positions on the thin plate member by etching, as illustrated in FIG.

  In the key sheet member of the present invention, the desirable dimensions of each part in the punching pattern are as follows: the width of the punched part surrounding the floating island part is 0.01 to 0.5 mm, the width of the bridge part is 0.01 to 0.3 mm, The half etching depth of the bridge portion is 5 to 90% of the plate thickness. However, since the final structure of the key sheet member also has various forms, the width of the bridge portion and the half etching depth may be increased depending on the form.

  Here, when the human eyes are separated by 30 cm or more and viewed with the naked eye, the width of the bridge portion supporting the floating island portion is 0.05 mm in the extraction pattern in which the width of the extraction portion is 0.1 to 0.3 mm. When it becomes below, it becomes difficult to recognize the bridge part, and it has been confirmed that the floating island part appears to exist alone.

  The bridge portion of the key top member can be variously designed in relation to strength and floating island portion. That is, the strength can be increased by adjusting the position of the bridge portion for each display unit. In addition, in the key top member, not only the floating island part but also the structurally weak part may be connected to the surrounding by the bridge part. In such a case as well, the bridge part is connected to the half from at least one surface. It is formed by etching.

  The key top member of the present invention is used as a push button part in a key sheet of a cellular phone, as well as other mobile devices such as a portable information terminal device, and various electronic devices having a push button switch as a component.

  8 and 9 are pattern diagrams showing an example of the design of the bridge portion. In these drawings, the diagonal line portion of the extracted letter is the bridge portion 5, and in the illustrated example, the bridge portion 5 is left uniformly at an angle of 45 degrees. If designed in this way, the bridge portion 5 looks like a tint block, so it becomes inconspicuous. Further, the structurally weak portion is also reinforced by the bridge portion 5.

  Next, a method for manufacturing a key top member having such a bridge portion will be described. In this manufacturing method, stainless steel is usually used as the metal used for the key top member, and ferric chloride is used as the etching solution.

[Production Method-1]
FIG. 10 is a process diagram for explaining a first manufacturing method of a key top member with a bridge portion left on one surface (here, the lower surface) side.

  First, as shown in FIG. 10 (a), a photosensitive resist is applied to both surfaces of a metal thin plate member 2, and then a resist pattern 11 having openings 11a and 11b having a predetermined shape using a predetermined pattern plate. And a resist pattern 12 having an opening 12a corresponding to one of the openings 11a. Here, the openings 11a and 12a correspond to the extracted portions, and the openings 11b correspond to the bridge portions.

  Next, as shown in FIG. 10B, the thin plate member 2 on which the resist patterns 11 and 12 having openings of a predetermined shape are formed is etched with a corrosive liquid from both sides. At this time, the etching process is stopped when the depth in the plate thickness direction reaches a predetermined amount (for example, when the punched portion 15 such as letters penetrates by etching from both sides). As a result, the bridge portion 5 remains on the lower surface side at the opening 11b.

  Finally, as shown in FIG. 10 (c), the resist patterns 11 and 12 are peeled off and washed to form a cutout portion 15 for characters and the like, and leave the bridge portion 5 on the lower surface side. Get.

  The manufacturing method of the key top member leaving the bridge portion on the upper surface side is the same as that shown in FIG.

[Production method-2]
FIG. 11 is a process diagram for explaining a second manufacturing method of the key top member in which the bridge portion is left on one surface (here, the lower surface) side.

  First, as shown in FIG. 11A, a photosensitive resist is applied to both surfaces of a metal thin plate member 2, and a resist pattern 11 having openings 11a and 11b having a predetermined shape is formed using a predetermined pattern plate. Then, after forming the resist pattern 12 having the opening 12a corresponding to one of the openings 11a, a removable film 20 is attached to the lower surface so as to cover the opening 12a. Here, the openings 11a and 12a correspond to the extracted portions, and the openings 11b correspond to the bridge portions.

  Next, as shown in FIG. 11B, resist patterns 11 and 12 having openings of a predetermined shape are formed, and the first time by the corrosive liquid is applied to the thin plate member 2 in which the film 20 is attached to the lower surface. After performing the etching process, the film 20 on the lower surface is peeled off. At this time, the etching process is stopped when the depth in the plate thickness direction reaches a predetermined amount (when the opening 11b reaches a thickness that remains as a bridge portion).

  Subsequently, as shown in FIG. 11C, the upper surface side is covered with an etching resistance layer 13. Specifically, the photosensitive resist is applied on the upper surface side while the resists on both sides in the member shown in FIG. 11B are left, and then exposed and developed using a predetermined pattern plate. As shown in (c), the resist is patterned to form the etching resistance layer 13.

  Next, as shown in FIG. 11D, a second etching process using a corrosive liquid is performed on the thin plate member 2 provided with the etching resistance layer 13 on the upper surface side so as to pass through the punched portions 15 such as characters. .

  Finally, as shown in FIG. 11 (e), the etching resistance layer 13 and the resist patterns 11 and 12 are peeled off and washed to form a cutout portion 15 for characters and the like, and the bridge portion 5 is formed on the lower surface side. The remaining key top member is obtained.

  The manufacturing method of the key top member leaving the bridge portion on the upper surface side is the same as that shown in FIG.

[Production method-3]
FIG. 12 is a process diagram for explaining a third manufacturing method of the key top member in which the bridge portion is left on one surface (here, the lower surface) side.

  First, as shown in FIG. 12A, after a photosensitive resist is applied to both surfaces of a thin metal plate member 2, a resist pattern 11 having openings 11a and 11b having a predetermined shape is formed using a predetermined pattern plate. And a resist pattern 12 having an opening 12a corresponding to one of the openings 11a. Here, the openings 11a and 12a correspond to the extracted portions, and the openings 11b correspond to the bridge portions.

  Next, as shown in FIG. 12B, a first etching process using a corrosive liquid is performed on both sides of the thin plate member 2 on which the resist patterns 11 and 12 having openings having a predetermined shape are formed. At this time, the etching process is stopped when the depth in the plate thickness direction reaches a predetermined amount (when the opening 11b reaches a thickness that remains as a bridge portion). At this time, the openings 11a and 12a corresponding to the extracted portions of characters and the like are not penetrated.

  Subsequently, as shown in FIG. 12C, the upper surface side is covered with an etching resistance layer 13. Specifically, the photosensitive resist is applied on the upper surface side while the resists on both sides of the member shown in FIG. 12B are left over, and then exposed and developed using a predetermined pattern plate. As shown in (c), the resist is patterned to form the etching resistance layer 13.

  Next, as shown in FIG. 12 (d), the thin plate member 2 provided with the etching resistance layer 13 on the upper surface side is subjected to a second etching process using a corrosive liquid so as to pass through the extracted portion 15 such as characters. .

  Finally, as shown in FIG. 12 (e), the etching resistance layer 13 and the resist patterns 11 and 12 are peeled off and washed, so that letters 15 and the like are removed, and the bridge portion 5 is formed on the lower surface side. The remaining key top member is obtained.

  The manufacturing method of the key top member leaving the bridge portion on the upper surface side is the same as that shown in FIG.

[Production Method-4]
FIG. 13 is a process diagram for explaining a fourth method of manufacturing a key top member with a bridge portion left on one side (here, the lower surface).

  First, as shown in FIG. 13A, a photosensitive resist is applied to both surfaces of a metal thin plate member 2 and a resist pattern 11 having openings 11a and 11b having a predetermined shape is formed using a predetermined pattern plate. Then, after forming the resist pattern 12 having the opening 12a corresponding to one of the openings 11a, a removable film 20 is attached to the upper surface so as to cover the openings 11a and 11b. Here, the openings 11a and 12a correspond to the extracted portions, and the openings 11b correspond to the bridge portions.

  Next, as shown in FIG. 13B, resist patterns 11 and 12 having openings of a predetermined shape are formed, and the first time by the corrosive liquid is applied to the thin plate member 2 in which the film 20 is pasted on the upper surface. After the etching process, the film 20 on the upper surface is peeled off. At this time, the etching process is stopped when the depth in the plate thickness direction reaches a predetermined amount (when the opening 11a does not penetrate and a certain thickness remains).

  Subsequently, as shown in FIG. 13C, the lower surface side is covered with an etching resistance layer 14. Specifically, with the resist shown on both sides of the member shown in FIG. 13 (b) remaining, a photosensitive resist is applied on the lower surface side, and then exposed and developed using a predetermined pattern plate. As shown in (c), the resist is patterned to form the etching resistance layer 14.

  Next, as shown in FIG. 13D, the thin plate member 2 having the etching resistance layer 14 provided on the lower surface side is subjected to a second etching process using a corrosive liquid so as to pass through the extracted portion 15 such as characters. . At this time, the etching process is stopped when the opening 11b reaches a thickness that remains as a bridge portion.

  Finally, as shown in FIG. 13 (e), the etching resistance layer 14 and the resist patterns 11 and 12 are peeled off and washed to form a cutout portion 15 for characters and the like, and the bridge portion 5 is formed on the lower surface side. The remaining key top member is obtained.

  The manufacturing method of the key top member leaving the bridge portion on the upper surface side is the same as that shown in FIG.

[Production Method-5]
FIG. 14 is a process diagram for explaining a method of manufacturing a key top member with a bridge portion left in the middle in the thickness direction.

  First, as shown in FIG. 14A, after a photosensitive resist is applied to both surfaces of a metal thin plate member 2, a resist pattern 11 having openings 11a and 11b having a predetermined shape is formed using a predetermined pattern plate. And a resist pattern 12 having openings 12a and 12b corresponding to them. Here, the openings 11a and 12a correspond to the extracted portions, and the openings 11b correspond to the bridge portions.

  Next, as shown in FIG. 14B, a first etching process using a corrosive solution is performed on both sides of the thin plate member 2 on which the resist patterns 11 and 12 having openings having a predetermined shape are formed. At this time, the etching process is stopped when the depth in the plate thickness direction reaches a predetermined amount (when the thickness reaches the bridge portion).

  Subsequently, as shown in FIG. 14C, both surfaces are covered with etching resistance layers 13 and 14 except for only one opening 12a among the openings corresponding to the extracted portion. That is, the etching resistance layers 13 and 14 having resistance to etching are formed on both sides to be left as a bridge portion, and the etching resistance layer 13 is formed only on one side in a portion to be a removal portion. Specifically, by leaving the resist patterns 11 and 12 on both sides of the member shown in FIG. 14 (b) to remain and further applying a photosensitive resist, exposure and development using a predetermined pattern plate. As shown in FIG. 14C, the resist is patterned to form etching resistance layers 13 and 14.

  Next, as shown in FIG. 14D, a second etching process using a corrosive liquid is performed on the thin plate member 2 provided with the etching resistance layers 13 and 14 on both surfaces, thereby penetrating the character punched portion 15.

  Finally, as shown in FIG. 14E, the etching resistance layers 13 and 14 and the resist patterns 11 and 12 are peeled off and washed to form a cutout portion 15 such as characters and the middle in the thickness direction. To obtain a key top member in which the bridge portion 5 is formed.

  As mentioned above, although embodiment of this invention was described in detail, the keytop member by this invention and its manufacturing method are not limited to the said embodiment at all, In the range which does not deviate from the meaning of this invention. Of course, various modifications are possible.

It is a top view which shows roughly an example of the keytop member which concerns on this invention. FIG. 10 is an enlarged explanatory view showing a numeral “8” portion in the key top member. FIG. 5 is an enlarged explanatory view showing a numeral “4” portion in the key top member. FIG. 10 is an enlarged explanatory view showing a numeral “9” portion in the key top member. It is explanatory drawing at the time of leaving a bridge part on the lower surface side. It is explanatory drawing at the time of leaving a bridge part on the upper surface side. It is explanatory drawing at the time of leaving a bridge part in the middle of the thickness direction. It is a pattern figure which shows the example of a design of a bridge | bridging part. It is a pattern figure which shows the example of a design of a bridge | bridging part. It is process drawing for demonstrating the 1st manufacturing method of the keytop member which left the bridge | bridging part on the lower surface side. It is process drawing for demonstrating the 2nd manufacturing method of the keytop member which left the bridge | bridging part on the lower surface side. It is process drawing for demonstrating the 3rd manufacturing method of the keytop member which left the bridge | bridging part on the lower surface side. It is process drawing for demonstrating the 4th manufacturing method of the keytop member which left the bridge | bridging part on the lower surface side. It is process drawing for demonstrating the manufacturing method of the key top member which left the bridge part in the middle of the thickness direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Key top member 2 Thin plate member 3 Display part 3a Character 3b Number 3c Symbol 3d Graphic 4 Floating island part 5 Bridge part 11 Resist pattern 11a, 11b Opening part 12 Resist pattern 12a, 12b Opening part 13, 14 Etching resistance layer 15 Excluded part

Claims (7)

  As a push button part in a key sheet of an electronic device, a plurality of display parts composed of letters, numbers, symbols or figures formed as a punching pattern by etching are each made of a thin metal plate member arranged at a predetermined position. A key top member to be used, wherein at least one display portion has a floating island portion supported by a bridge portion connected to the periphery, and the bridge portion is formed by half etching from at least one surface, and the half etching is performed. A key top member characterized in that a step is provided at the boundary between the bridge portion and the floating island portion and the boundary between the bridge portion and the floating island portion on the formed surface side. The key top member manufacturing method according to claim 1, wherein the bridge portion is formed by etching only from one surface, and the following steps are sequentially performed. Production method.
(1) A photosensitive resist is applied to both surfaces of a thin plate member, and a predetermined pattern plate is used, and an opening portion is provided on both sides of the portion to be a punched portion and an opening is provided only on the other surface in a portion to be a bridge portion. Forming a resist pattern of a predetermined shape having a portion.
(2) A step of performing etching with a corrosive solution from both surfaces of a thin plate member on which a resist pattern having a predetermined shape is formed, penetrating the punched portion and forming a bridge portion on the other surface side.
(3) A step of removing the resist pattern. The key top member manufacturing method according to claim 1, wherein the bridge portion is formed by etching only from one surface, and the following steps are sequentially performed. Production method.
(1) A photosensitive resist is applied to both surfaces of a thin plate member, and a predetermined pattern plate is used, and an opening portion is provided on both sides of the portion to be a punched portion and an opening is provided only on the other surface in a portion to be a bridge portion. A step of attaching a re-peelable film to the other surface having no opening corresponding to the bridge portion after forming a resist pattern of a predetermined shape having a portion.
(2) A resist pattern having a predetermined shape was formed on both sides, and the first etching process using a corrosive solution was performed on a thin plate member formed by attaching a film on the other side until reaching a thickness that left a bridge portion. Then, the process of peeling the film in the other side.
(3) A step of covering one surface side having an opening corresponding to the bridge portion with an etching resistance layer from above the resist patterning.
(4) A step of performing a second etching process using a corrosive liquid on the thin plate member provided with the etching resistance layer and penetrating the punched portion.
(5) A step of peeling the etching resistance layer and the resist pattern. The key top member manufacturing method according to claim 1, wherein the bridge portion is formed by etching only from one surface, and the following steps are sequentially performed. Production method.
(1) A photosensitive resist is applied to both surfaces of a thin plate member, and a predetermined pattern plate is used, and an opening portion is provided on both sides of the portion to be a punched portion and an opening is provided only on the other surface in a portion to be a bridge portion. Forming a resist pattern of a predetermined shape having a portion.
(2) A step of performing the first etching process with the corrosive liquid from both surfaces of the thin plate member on which the resist pattern having a predetermined shape is formed until the portion is penetrated and the bridge portion is formed on the other surface side. .
(3) A step of covering one surface side having an opening corresponding to the bridge portion with an etching resistance layer from above the resist patterning.
(4) A step of performing a second etching process using a corrosive liquid on the thin plate member provided with the etching resistance layer and penetrating the punched portion.
(5) A step of peeling the etching resistance layer and the resist pattern. The key top member manufacturing method according to claim 1, wherein the bridge portion is formed by etching only from one surface, and the following steps are sequentially performed. Production method.
(1) A photosensitive resist is applied to both surfaces of a thin plate member, and a predetermined pattern plate is used, and an opening portion is provided on both sides of the portion to be a punched portion and an opening is provided only on the other surface in a portion to be a bridge portion. A step of applying a re-peelable film to one surface having an opening corresponding to the bridge portion after forming a resist pattern of a predetermined shape having a portion.
(2) Depth in the thickness direction of the first etching process with a corrosive solution on a thin plate member in which a resist pattern having a predetermined shape is formed on both surfaces and a removable film is attached to one surface The process which peels the film which can be re-peeled after performing until it becomes predetermined amount.
(3) A step of covering the other surface side having no opening corresponding to the bridge portion with an etching resistance layer from above the resist patterning.
(4) A step of performing a second etching process using a corrosive liquid on the thin plate member provided with the etching resistance layer, penetrating the punched portion and forming a bridge portion on the other surface side.
(5) A step of peeling the etching resistance layer and the resist pattern. The key top member manufacturing method according to claim 1, wherein the bridge portion is formed by etching from both sides, and the following steps are sequentially performed. Method.
(1) A photosensitive resist is applied to both surfaces of the thin plate member, and a resist pattern having a predetermined shape having openings on both surfaces is formed in both the portion to be a punched portion and the portion to be a bridge portion using a predetermined pattern plate. Process.
(2) A step of performing a first etching process using a corrosive solution from both surfaces of a thin plate member on which a resist pattern having a predetermined shape is formed to a thickness that leaves a bridge portion.
(3) A step of covering both surfaces with an etching resistance layer while leaving only one of the openings corresponding to the extracted portion.
(4) A step of performing a second etching process with a corrosive liquid on the thin plate member provided with the etching resistance layer, penetrating the punched portion and forming a bridge portion leaving the middle in the thickness direction.
(5) A step of peeling the etching resistance layer and the resist pattern.   An electronic device using a key sheet as a substitute for a push button switch, wherein the key top member according to claim 1 is used as a push button portion in the key sheet.

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