KR20120006815A - Fabrication method of keypad and the keypad by using the same method - Google Patents

Fabrication method of keypad and the keypad by using the same method Download PDF

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Publication number
KR20120006815A
KR20120006815A KR1020100067476A KR20100067476A KR20120006815A KR 20120006815 A KR20120006815 A KR 20120006815A KR 1020100067476 A KR1020100067476 A KR 1020100067476A KR 20100067476 A KR20100067476 A KR 20100067476A KR 20120006815 A KR20120006815 A KR 20120006815A
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KR
South Korea
Prior art keywords
key
film
keypad
support member
mold
Prior art date
Application number
KR1020100067476A
Other languages
Korean (ko)
Inventor
송동호
추교영
Original Assignee
주식회사 하이디스
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 하이디스 filed Critical 주식회사 하이디스
Priority to KR1020100067476A priority Critical patent/KR20120006815A/en
Publication of KR20120006815A publication Critical patent/KR20120006815A/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/02—Details
    • H01H13/12—Movable parts; Contacts mounted thereon
    • H01H13/14—Operating parts, e.g. push-button
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/702—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
    • H01H13/704—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches characterised by the layers, e.g. by their material or structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/88—Processes specially adapted for manufacture of rectilinearly movable switches having a plurality of operating members associated with different sets of contacts, e.g. keyboards
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/0002—Condition, form or state of moulded material or of the material to be shaped monomers or prepolymers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2229/00—Manufacturing
    • H01H2229/044—Injection moulding

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  • Push-Button Switches (AREA)
  • Manufacture Of Switches (AREA)

Abstract

PURPOSE: A keypad manufacturing method and a keypad manufactured using the same are provided to arrange a slim type keypad with a thin thickness by omitting a key button manufacturing process with a separate injection molding process. CONSTITUTION: A key top is comprised of a key button(11) and a supporting member(12). The key button is located in a place corresponding to a protrusion(13a). A frame(14) arranges a penetration hole(14a) in a place corresponding to the key button. A plate member(17) is arranged in the inside the key base. A pressed hole(17a) with a predetermined size is arranged in a place corresponding to the key button.

Description

Manufacturing method of keypad and keypad manufactured by the manufacturing method {Fabrication method of keypad and the keypad by using the same method}

The present invention relates to a method for manufacturing a keypad and a keypad manufactured by the method, and more particularly, to a method for manufacturing a key button and a key button which can be slimmed, a manufacturing process is simple, and a manufacturing defect can be minimized. will be.

In general, a mobile communication terminal including a mobile phone or a PDA (PDA) is used a keypad having a plurality of key buttons for input. 1 is a view showing a keypad of a mobile communication terminal according to the prior art, FIG. 2 is a sectional view taken along line II-II of FIG. 1, FIG. It is sectional drawing which shows the key button manufactured by.

The mobile communication terminal has a printed circuit board 130 and a dome switch 140 formed on the printed circuit board 130 that enable generation of an electrical signal by operation of the keypad 100 and the keypad in a case (not shown). ) Is placed.

The keypad 100 includes a key top and a key base 120, and the key top includes a plurality of key buttons 110. In addition, the key base 120 is integrally formed under the key buttons 110, and protrusions 121 protruding downward are disposed on the other surface side corresponding to the key buttons 110. The dome switch 140 formed on the printed circuit board 130 is installed at each position corresponding to the protrusion 121, and has a hemispherical dome part 141 and a contact disposed inside the dome part 141. 142). Meanwhile, when any one of the plurality of key buttons 110 is pressed, the key button 110 has a predetermined desired value by contacting the contact 142 with the dome part 141 on the protrusion 121. It will perform the function.

Such a keypad is manufactured by separately attaching separately manufactured key buttons to a key base. In other words, the respective key buttons are manufactured by attaching each of the key buttons to the position where the protrusion is provided. However, this process is quite cumbersome and inconvenient to work. In addition, if the wrong key button is attached to the key base in the process of moving the key buttons, there is also the inconvenience of having to discard the entire keypad.

In addition, a plurality of key buttons are likely to cause defects in the manufacturing process. That is, the key buttons are manufactured by injection molding a key button molded body in which a key button of a desired shape is connected to each other by a connecting part in a mold, and then a predetermined coating layer is formed on each key button using a spray method. do. Thereafter, as shown in FIG. 3, each key button 110 is cut with respect to the peripheral connection part 111, and the cut covertons 110 are individually bonded to the pad to complete the manufacture of the keypad. Will be.

As shown in FIG. 4, the key button manufactured by the above process may have a defect due to the lower side of the side being torn off by the connection part, and unwanted light leakage may occur in this process.

In addition, the key button 110 is manufactured by injection molding, but if the thickness of the cavity is small, the molten resin may harden before the molten resin reaches the end, resulting in defective products. Only when this can be filled with a sufficient amount of molten resin inside the cavity of the injection mold has a problem that it is difficult to reduce the thickness of the overall key button.

The present invention was created in order to solve the above-mentioned problems, and more specifically, it is easy to manufacture by integrally processing the key top and the key base, and it is not necessary to manufacture a key button by a separate injection molding to reduce the thickness. An object of the present invention is to provide a method for manufacturing a slim keypad and a slim keypad.

Used in the mobile communication terminal according to the present invention for achieving the above object, the key top and the key base are integrally formed, and the key top is arranged in a predetermined key assembly arrangement and has a plurality of key buttons having a convex shape. In the key base manufacturing method of the keypad is formed with a plurality of projections in contact with the dome switch,

A film piece preparation step of preparing a plurality of film pieces having a size corresponding to the key button by cutting the film;

A supporting member attaching step of attaching the other surface of each of the film pieces to one surface of the supporting member so as to support the film pieces to produce a key top;

Synthetic resin coating step of applying a liquid polymer resin material on the other surface of the support member;

A molding step of inserting the key top coated with the liquid polymer resin material into a second mold to mold the plurality of protrusions by the liquid polymer resin material; And

And a curing step of curing the liquid polymer resin material to form a key base.

In the manufacturing method of the keypad,

In the preparing of the film piece, a first mold having a desired size of a key button and having a plurality of first recesses opened upward and a first protrusion formed between each first recess is provided.

After positioning the film on the upper side of the first mold, it is preferable to cut the film along the edge of the first recess so that each cut piece of film is seated on the corresponding first recess.

In the manufacturing method of the keypad,

Preferably, each of the first recesses is formed at a position corresponding to the key assembly arrangement.

In the manufacturing method of the keypad,

Between the supporting member attaching step and the synthetic resin applying step, a plate member formed of a metal or plastic material and having a pressing hole having a predetermined size for each position corresponding to the film piece is seated on the other surface of the supporting member. Preferably, the plate member seating step is further included.

In the manufacturing method of the keypad,

Preferably, the molding step includes molding the film piece in the form of a key button convex in the second mold and molding the liquid polymer resin material into a shape corresponding to the key base.

In the manufacturing method of the keypad,

The second mold,

It is composed of a lower die formed with a second concave portion having a concave surface having a shape corresponding to the convex key button, and an upper die formed with the shape of the key base and a protrusion groove corresponding to the protrusion formed on the other surface. desirable.

In the manufacturing method of the keypad,

After inserting the support member into the second mold, it is preferable to apply the heat or pressure so that the film piece, the support member and the liquid silicone are molded to fit the shape in the mold.

In the manufacturing method of the keypad,

After the curing step,

Each of the film pieces are spaced apart from each other at regular intervals, it is preferable to further include a frame attaching step of attaching the frame between the film pieces, the through-hole is formed in a position corresponding to the film piece.

In the manufacturing method of the keypad,

Preferably, the film piece and the support member are bonded to each other by a heat adhesive or a UV adhesive.

In the manufacturing method of the keypad,

In the film piece preparation step,

It is preferable to include light-shielding printing so that light does not leak to the other surface of the film.

In the manufacturing method of the keypad,

In the supporting member attaching step,

It is preferable that one side or the other side of the support member includes shading printing so that light does not leak.

Slim keypad according to the present invention is manufactured by the above-described manufacturing method,

A key base in which a protrusion is integrally formed at a position corresponding to the dome switch; And

It is preferably made of a key top which is disposed on the upper side of the key base and comprises a support member made of a synthetic resin sheet, and a key button formed at a position corresponding to the protrusion on the support member and made of a film.

The key button includes any one of polycarbonate (PC), polyethylene terephthalate, polymethyl methacrylate (PMMA) or a laminated film.

In the slim keypad, the support member is preferably made of a paper including at least one of each of polyamide (PA), polyurethane (PU), or polycarbonate (PC).

The slim keypad is preferably light-shielded and printed so as not to leak light on one surface or the other surface of the support member.

In the slim keypad,

The thickness of the support member is preferably 0.05 ~ 0.25mm.

In the slim keypad,

The thickness of the key top is preferably 0.2 ~ 0.4mm.

In the slim keypad,

In the key base, it is preferable that a pressing hole having a predetermined size is formed at a position corresponding to the key button, and a sheet member having a sheet shape made of a metal or plastic material is disposed.

1 is a view showing a key button according to the prior art.
FIG. 2 is a sectional view taken along the line II-II of FIG. 1; FIG.
3 is a view showing a process of manufacturing the key button of FIG.
4 is a cross-sectional view of the key button of FIG.
5 is a cross-sectional view of a keypad according to a preferred embodiment of the present invention.
6 is a view showing a manufacturing method of the keypad of FIG.
7 is a cross-sectional view of a keypad according to another embodiment of the present invention.
8 is a cross-sectional view of a keypad according to another embodiment of the present invention.

Hereinafter, an embodiment of a key button according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Keypad according to a preferred embodiment of the present invention, a key base, a key top, a plate member and a frame.

The key base 13 is a projection 13a formed at a position corresponding to the dome switch 30 of the printed circuit board 20, and is made of a synthetic resin material having good elasticity as a whole. Specifically, a polymer resin material such as silicon is preferably used.

The key top is composed of a key button 11 and a support member 12. Specifically, it consists of the key button 11 which consists of film pieces, and the support member 12 which supports each said key button 11. At this time, the thickness of the key top is preferably 0.2 ~ 0.4mm. In addition, the thickness of the key button is preferably 0.05 ~ 0.25mm.

The key button 11 is preferably disposed in a position corresponding to the projection (13a) is preferably made of a film. Specifically, it is preferable to include any one of polycarbonate (PC), polyethylene terephthalate (PET), polymethyl methacrylate (PMMA) or a laminated film. The key button 11 preferably has a convex shape that gradually rises from the edge toward the center.

The support member 12 is preferably made of a paper including at least one of each of polyamide (PA), polyurethane (PU) or polycarbonate (PC) that can be elastic and yet have sufficient strength, It is not limited to this. The support member 12 is to support a plurality of key buttons 11, specifically, in the portion to which the key button 11 is attached, has a shape that rises somewhat convexly upward, and the portion between them is the lower side. The frame 14 may be seated in the recessed portion of the frame 14.

The frame 14 is a metal plate made of a metal material in which a through hole 14a is formed at a position corresponding to the key button 11. The frame 14 is connected to the support member 14 between the key button 11 and the key button. You are in contact.

The plate member 17 is disposed inside the key base 13, and a pressing hole 17a of a predetermined size is formed at a position corresponding to the key button 11, and is made of a metal or plastic material. It is in the form of a sheet. The plate member 17 is to support a relatively soft soft key base, it is preferable that a relatively hard material is used.

The slim keypad according to the present invention is manufactured as follows.

First, as shown in FIG. 6 (a), between a plurality of first recesses 41 having a size of a desired key button 11 and opening upward, between each of the first recesses 41. After providing the 1st mold 40 in which the 1st convex part 42 arrange | positioned is provided, and after placing the film 11 'on the upper side of the said 1st mold 40, the said 1st recessed part 41 By cutting the film 11 'along the edges of the film 11', each film piece 11c cut out is seated on the corresponding first recess 41, as shown in FIG. 6 (b), A plurality of film pieces 11c having sizes corresponding to the key buttons 11 are provided. At this time, the remaining film piece 11b is provided in the 1st convex part 42, and this remaining film piece 11b is removed after being cut | disconnected.

At this time, the first recess 41 is disposed at a position corresponding to the arrangement of the desired key assembly. Accordingly, the film piece 11c required by cutting is placed at a position for the desired key assembly without the need for a separate arrangement of the positions for key assembly. Preferably, the vertical distance between the other surface of the first recess 41 and the one surface of the first convex portion 42 corresponds to the thickness of the film piece 11c. On the other hand, the film piece left behind in the 1st convex part 42 is removed after that.

Subsequently, as shown in FIG. 6C, the other surface of each film piece 11c is attached to one surface of the support member 12 to support the film piece 11c, thereby manufacturing a keytop. In other words, the support member 12 and the film piece 11c may be adhered to one surface of the support member 12 in a state where a thermal adhesive or UV adhesive is applied in advance.

Subsequently, as shown in FIG. 6 (d), a frame member made of a metal or plastic material and having a pressing hole having a predetermined size for each position corresponding to the film piece is seated on the other surface of the support member. Let's do it.

Thereafter, as shown in FIG. 6E, after applying the liquid polymer resin material having a predetermined thickness to the other surface side of the support member 12, the key top to which the liquid polymer resin material 13 ′ is applied is applied. It is inserted into the second mold (50, 60) is molded to form a plurality of projections by the liquid polymer resin material 13 '. Specifically, as shown in Fig. 6 (f), the lower die 60 is formed with a second recess 61 having a concave surface having a shape corresponding to the convex key button 11, Prepare the second mold (50, 60) made of the upper mold (50) having the form of the key base 13 and the projection groove 51 corresponding to the projection (13a) is formed on the other surface, the second The key top to which the liquid polymer resin material is applied is inserted into the molds 50 and 60. At this time, by applying heat or pressure, the film piece 11c, the support member 12, and the liquid polymer resin material in a predetermined form in the second molds 50 and 60, as shown in FIG. 13 ') can be molded. In this process, the liquid polymer resin material 13 ′ may form the protrusion 13a by the protrusion groove 51 of the upper mold 50, and the film piece 11c is a concave surface of the lower mold 60. It will be able to be molded in a convex shape according to the shape of the. At this time, the liquid polymer resin 13 ′ enters the back side of the plate member 17 through the pressing hole 17a of the plate member 17, while separating the plate member 17 from the support member 12. Filled in between.

Thereafter, the keypad 10 having the key top and the key base 13 having a desired shape may be manufactured by curing the liquid polymer resin material 13 ′. Thereafter, as shown in Fig. 6G, the frame 14 can be positioned between the film pieces 11c. Specifically, each of the film pieces 11c is attached to the support member in a state in which the film pieces 11c are spaced apart from each other. The film pieces 11c are formed with a frame 14 having a through hole formed at a position corresponding to the film pieces 11c. ) Will be attached between.

According to the slim keypad according to the present invention, the arrangement of the key button with the production of the key button can be made at a time, there is an advantage that the manufacturing process can be simplified.

In addition, according to the slim keypad according to the present invention, since the key button does not need to be manufactured by injection molding, there is an advantage that a thinner keypad can be realized.

In addition, in the prior art, it was difficult to accurately attach the projection of the key base to a position corresponding to the key button, but according to the manufacturing method of the slim keypad according to the present invention, the key top provided with the key button is inserted into a mold in an insert method. Since the base member provided with the projection is formed by injection molding, the process can be facilitated and the difficulty of positioning the projection can be overcome.

The slim keypad according to the present invention can be modified as follows.

First, the pattern layer 15 may be formed on the bottom surface of the key button 11. That is, it is possible to form a pattern layer on the back side of the key button as shown in FIG. At this time, the pattern layer to be used may be made by a method such as printing a number or letters on the other surface of the film before the cutting process of the film. Such a pattern may be made of only an impermeable pattern layer that can prevent light leakage, or may be used in combination with various other transparent pattern layers. Meanwhile, the pattern layer is not limited thereto, and may be formed on the upper layer of the film.

In addition, as shown in Figure 9, it is also possible to form a pattern layer 16 on the back side of the support member 12. At this time, the pattern can be formed by shading printing or the like so as not to leak light on one side or the other side of the support member before attaching the support member to the film. On the other hand, of course, it is also possible to form such a pattern layer on the upper surface side of the support member.

In addition, the present invention is not limited thereto, and various decorations, such as forming various wavy patterns on the upper surface side of the key button by various methods to give metallic texture, can be varied.

As described above, according to the present invention, there is an advantage that problems such as various light leaks that may occur in each key button cutting process, as in the prior art, can be solved.

The present invention is not limited to this, but the scope of the claims can be broadly interpreted as long as it can reasonably be interpreted by the claims of the present invention.

10 ... Keypad 11 ... Key button
12.Support member 13 ... Key base
14 Frame 17 Plate member
20 Printed circuit board 30 Dome switch
40 ... 1st mold 50 ... Upper mold
60 ...

Claims (18)

Used in a mobile communication terminal, the key top and the key base are integrally formed, and the key top is arranged in a predetermined key assembly arrangement form, and a plurality of key buttons having a convex shape are provided, and the key base has a plurality of contacting dome switches. In the manufacturing method of the keypad in which the projection is formed,
A film piece preparation step of preparing a plurality of film pieces having a size corresponding to the key button by cutting the film;
A supporting member attaching step of attaching the other surface of each of the film pieces to one surface of the supporting member so as to support the film pieces to produce a key top;
Synthetic resin coating step of applying a liquid polymer resin material on the other side of the support member;
A molding step of inserting the key top coated with the liquid polymer resin material into a second mold to mold the plurality of protrusions by the liquid polymer resin material; And
And a curing step of curing the liquid polymer resin material to form a key base. The method of claim 1,
The film piece preparation step,
Providing a first mold having a desired size of a key button and having a plurality of first recesses opened upwardly, and a first convex portion disposed between each of the first recesses;
After positioning the film on the upper side of the first mold, by cutting the film along the edge of the first recessed portion so that each cut piece of film is seated on the corresponding first recessed portion of the slim keypad Manufacturing method. The method of claim 2,
Wherein each of the first recesses is formed at a position corresponding to the key assembly arrangement. The method of claim 1,
Between the supporting member attaching step and the synthetic resin applying step, a plate member formed of a metal or plastic material and having a pressing hole having a predetermined size for each position corresponding to the film piece is seated on the other surface of the supporting member. The manufacturing method of the slim keypad characterized in that it further comprises a plate member mounting step. The method of claim 1,
The forming step may include forming the film piece in the form of a convex key button in the second mold and forming the liquid polymer resin material into a shape corresponding to the key base. Way. The method of claim 5,
The second mold,
A lower mold having a second concave portion having a concave surface having a shape corresponding to the convex key button, and an upper mold having a shape of the key base and having a protrusion groove corresponding to the protrusion formed on the other surface thereof. Method of manufacturing a slim keypad characterized in that. The method of claim 6,
And inserting the support member into the second mold, thereby applying the heat or pressure so that the film piece, the support member, and the liquid silicone are molded to conform to the shape in the mold. The method of claim 1,
After the curing step,
Each of the film pieces are spaced apart from each other at regular intervals, and further comprising a frame attaching step of attaching a frame formed between the film pieces through-hole is formed in a position corresponding to the film piece between the slim keypad of the Manufacturing method. The method of claim 1,
The film piece and the support member is a manufacturing method of the slim keypad characterized in that the adhesive to each other by a heat adhesive or UV adhesive. The method of claim 1,
In the film piece preparation step,
The manufacturing method of the slim keypad characterized in that it comprises printing the pattern of the number or letter on the other side of the film. The method of claim 1,
In the supporting member attaching step,
One or the other surface of the support member manufacturing method of the slim keypad characterized in that it comprises a light-shielding printing so that light does not leak. A slim keypad manufactured by the manufacturing method of claim 1,
A key base in which a protrusion is integrally formed at a position corresponding to the dome switch; And
And a key top disposed on an upper side of the key base and including a support member made of a synthetic resin sheet, and a key top including a key button made of a film and disposed at a position corresponding to the protrusion on the support member. The method of claim 12,
The key button is a slim keypad, characterized in that it comprises any one of polycarbonate (PC), polyethylene terephthalate (PET), polymethyl methacrylate (PMMA) or a laminated film. The method of claim 12,
The support member is a slim keypad, characterized in that made of a paper comprising at least one of each of polyamide (PA), polyurethane (PU) or polycarbonate (PC). The method of claim 12,
Slim keypad characterized in that the light is printed on one surface or the other surface of the support member so that light does not leak. The method of claim 12,
The thickness of the support member is a slim keypad, characterized in that 0.05 ~ 0.25mm The method of claim 12,
Slim keypad characterized in that the thickness of the key top is 0.2 ~ 0.4mm. The method of claim 12,
The inside of the key base is a slim keypad characterized in that a pressing hole having a predetermined size is formed at a position corresponding to the key button, and a sheet member in the form of a sheet made of a metal or plastic material is disposed.
KR1020100067476A 2010-07-13 2010-07-13 Fabrication method of keypad and the keypad by using the same method KR20120006815A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020100067476A KR20120006815A (en) 2010-07-13 2010-07-13 Fabrication method of keypad and the keypad by using the same method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020100067476A KR20120006815A (en) 2010-07-13 2010-07-13 Fabrication method of keypad and the keypad by using the same method

Publications (1)

Publication Number Publication Date
KR20120006815A true KR20120006815A (en) 2012-01-19

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