KR20080088237A

KR20080088237A - Touch type key button structure of method

Info

Publication number: KR20080088237A
Application number: KR1020070030932A
Authority: KR
Inventors: 이홍충
Original assignee: 인성전자산업(주)
Priority date: 2007-03-29
Filing date: 2007-03-29
Publication date: 2008-10-02

Abstract

A touch type key button structure is provided to perform a function with a button input even if weak pressure is applied to a button by minimizing a gap of touch switch, and promptly respond a touch point of a switch by providing elastic force stably with a symmetrical anticline structure formed between a light outputting film and an upper PCB(Printed Circuit Board). A transparent protection film(210) displays characters at a front side. A light outputting film(220) is stacked under the protection film, and enables a user to recognize the characters or a numbers printed on the protection film by diffusing/lighting light of a light source to the protection film. A cushion member(230) is projected at the lower center of the light outputting film. An upper PCB(240) is stacked in a curved status by closely attaching to an edge of the light outputting film and the cushion member. A lower PCB(250) is stacked under the upper PCB at an interval. A both-side adhesive film(260) makes a gap while adhering the upper and lower PCB, and adhering the protection film and the light outputting film. A pair of touch switches are attached to the upper and lower PCB at the interval.

Description

Touch key button structure {TOUCH TYPE KEY BUTTON STRUCTURE OF METHOD}

1 is a perspective view showing the configuration of a general portable terminal.

2 is a partial cross-sectional view of a key button device according to the prior art.

Figure 3a is a cross-sectional view showing a state before operation of the key button structure of the present invention.

Figure 3b is a cross-sectional view showing a state after the operation of the key button structure of the present invention.

Explanation of symbols on the main parts of the drawings

200: key button 210: protective film

220: light emitting film 230: cushion member

240: upper circuit board 241: discharge space

250: lower circuit board 260: double-sided adhesive film

270: contact switch

The present invention relates to a touch key button structure of the present invention, and more particularly, to a touch key key structure capable of performing an immediate and stable key button signal function even with the same pressing sensitivity as a touch screen.

Electronic and electric devices used for personal use are miniaturized and thinned, and various additional functions are built in due to the pursuit of convenience. For example, a mobile telephone is provided with not only a telephone call function but also an auxiliary function such as an e-mail function, an Internet connection function, a photographing function, and the like, and efforts have been made to inspire consumers to purchase.

However, in order to increase the sales of goods, various functions are not sufficient, and it is proposed to increase the ease of use of the keypad of the electronic device to communicate or to acquire necessary information more easily.

In particular, portable wireless terminals are becoming smaller and more versatile in accordance with consumer needs. Accordingly, speaker units, earpieces, keypads, etc., which constitute the terminal, have also been miniaturized to meet these requirements, and are sprinting to further improve their functionality.

As shown in FIG. 1, a general portable terminal includes a main body 100 and a hinge device (not shown) configured to mechanically open and close the flip cover 200 and the flip cover 100 by a predetermined angle. do.

The main body 100 includes an upper casing frame 101 and a lower casing frame 102, and an antenna device 103 is installed at one side of the uppermost end of the main body. In addition, the earpiece 104 is located on the upper side of the main body, the display unit 105 is positioned below the keypad, and a keypad unit 106 having a plurality of key buttons is provided on the lower side thereof. Below the keypad 106 is provided a microphone 107 capable of transmitting a voice to the other party.

In this case, the plurality of key buttons configured in the keypad 106 are connected to the internal printed circuit board to serve as an input device for inputting information according to a user's selection.

The structure of the conventional terminal pushbutton switch is a key button 110 having a protrusion 112 and a dome pressed by the protrusion of the key button, as shown in Korean Utility Model Registration No. 20-0280101. 131 is composed of a flexible printed circuit 130, a printed circuit board to which the flexible printed circuit is bonded, and an upper casing frame 110 and a lower casing frame 102 constituting a main body while the components are installed. do.

A portion of the upper side is installed to protrude on the upper casing frame 101 of the key button, and the inside thereof is formed to have an empty space 111. In addition, a protrusion 112 is formed on the lower side of the protrusion. The key button 110 is made of a flexible material.

For example, a flexible plastic material or silicone rubber can be used.

Thereafter, the flexible printed circuit 130 is bonded onto the printed circuit board 120 fixed on the lower casing frame 102. The flexible printed circuit 130 has a dome 131 formed at a position corresponding to the contact portion formed on the printed circuit board 120. The dome 131 is formed or installed in a metal material. That is, the protrusion 111 of the key button 110, the dome 131 of the flexible printed circuit 130, and the contact portion of the printed circuit board 120 are formed at positions corresponding to each other, thereby allowing the user to press the key button 110. When pressing), the dome 131 is pressed by the protrusion 112 and the contact portion on the printed circuit board 120 is connected to perform a circuit operation.

However, the key button device according to the prior art has a wide gap between the contact projection of the key button and the dome adhered to the flexible printed circuit, so that when the pressing operation is performed, the projection and the dome are completely pushed down when the key button is pressed. As a result of the contact, the contact state of the button is determined according to the strength of the force to press the key button.

As a result, there was a problem in that the incidence of contact failure or signal error of the button is increased.

In addition, in the case of a mobile phone, the pressing speed of a button for a character or an input is not made quickly, causing an error input of a key button, and thus there is a problem in that reliability of a product equipped with the key button is lowered.

In addition, the gap between the protrusion and the dome has a large width that gives the user a rough feeling when pressed.

Accordingly, a main object of the present invention is to provide a touch type key button structure which aims to enable a function of a button input even when a minute pressing force is applied to the button by minimizing the gap between the contact switches.

In addition, another object of the present invention is to provide a more stable elastic force to the light emitting film and the upper circuit board in a symmetrical structure of mutual structure in the laminated structure of the key button to provide a more stable elastic force immediately reacts to the contact state of the switching switch To make it possible.

In addition, another object of the present invention is to form a discharge space in the space between the light emitting film and the center of the upper circuit board having an injecting structure to provide a soft touch feeling at the same time to prevent damage to the contact switch in the excessive pressing force. There is to help.

In order to achieve this purpose, the key button structure of the present invention is a transparent protective film with a letter display on the front, and laminated on the lower portion of the protective film, the light emitting source is illuminated by diffusing light with the protective film and printed on the protective film A light emitting film for identifying the letters or numbers, a cushioning member protruding from the lower center of the light emitting film, and an upper circuit stacked in a state of being bent in close contact with the edge and the cushioning member of the light emitting film. It is attached to the substrate, the lower circuit board to be spaced apart at regular intervals below the upper circuit board, the upper circuit board and the lower circuit board, the protective film and the light emitting film to the edge portion corresponding to each other to generate a mutual gap And a double-sided adhesive film to be integrally bonded to each other at the same time, and each of the upper and lower printed substrates Characterized by configuring a pair of switch contacts are attached spaced apart to correspond.

According to the present invention, the light emitting film and the upper circuit board are made of a mutually symmetrical radiating structure and configured to introduce a cushion member into the radiating space.

First, in the drawings, the same components or parts are to be noted that the same reference numerals as possible. In describing the present invention, detailed descriptions of related known functions or configurations are omitted in order not to obscure the subject matter of the present invention.

Figure 3a is a cross-sectional view showing a state before the operation of the key button structure of the present invention, Figure 3b is a cross-sectional view showing a state after the operation of the key button structure of the present invention.

First, as shown in Figure 3a or 3b, the key button structure of the touch button method of the present invention is a light through the transparent protective film 210, the light emitting source is built in the protective film 210 side. A light emitting film 220 that emits, a cushion member 230 protrudingly coupled to the center of the light emitting film 220, an upper circuit board 240 stacked in a symmetrical structure to the light emitting film 220, and The lower circuit board 250 and the upper and lower circuit boards 240 and 250 stacked on the lower portion of the upper circuit board 240 to be spaced apart from each other at regular intervals, and the upper and lower The pair of contact switches 270 are spaced apart from each other on the upper and lower surfaces of the lower circuit boards 240 and 250.

The protective film 210 is made of a transparent body with a letter or symbol display on the front surface, it may be made of acrylic PC, polyethylene resin.

In addition, the light emitting film 220 is also commonly referred to as an EL sheet, a transparent conductive film having an ITO layer formed on the film is used, or on a PEN (Polyethylene Naphthalate) film, which is thinner than PET film and has excellent durability and film properties. The transparent conductive film in which the ITO layer was formed is used.

In addition, the upper and lower circuit boards 240 and 250 have conductive circuit patterns printed on the front surface thereof and are electrically connected to the pair of contact switches 270.

In addition, the double-sided adhesive film 260 is made of a predetermined thickness, the adhesive is coated on both sides of the protective film 210, the light emitting film 220, each of the upper circuit board 240 and the lower circuit board 250 It is attached to the edge space between to enable the mutual adhesion of each film layer and at the same time serves to maintain each film layer spaced at a predetermined interval.

Here, the cushion member 230 is located in the center of the space between the light emitting film 220 and the upper circuit board 240 so that the light emitting film 220 and the upper circuit board 220 can be formed in an symmetrical mutual structure. The pair of contact switches 270 may be maintained in a state of being in close proximity to each other so that the contact switch 270 may be easily contacted with a light and soft pressing force by mutually minute clearances between the contact switches 270.

That is, in the stacking structure of the light emitting film 220 and the upper circuit board 240, each edge of the film layer is sequentially stacked, and a center portion is formed of an emission structure formed to be convexly symmetrical, and in particular, the emission structure including the emission structure ( The cushion member 230 is embedded in the discharge space 241 in the center of the 220 and the upper circuit board 240.

Looking at the operation of the present invention as follows.

Pressing the portion indicated by the number or letter on the protective film 210 for the button input to perform a function in the electronic terminal, the central portion of the protective film 210 is bent downward to generate a light emitting film having a discharge structure ( A convexly curved center portion of 220 may compress the cushion member 230.

The cushion member 230 that has received the pressing force is a constant pressing force, that is, the cushioning member 230 is lowered from the moment when the pressing limit that cannot absorb the cushion is exceeded after the pressure is softly received to the compression limit that can absorb the cushion. The center portion of the upper circuit board 240 having a convexly curved discharge structure is pressed by the cushion member 230 to attach the contact switch 270 attached to the center of the upper circuit board 240 to the lower circuit board 250. Contact with the contact switch 270 attached.

Here, the laminated structure of the light emitting film 220 and the upper circuit board 240 is composed of an emission structure formed by sequentially laminating the edges of each film layer, the center portion is convexly symmetrical, in particular, the light emitting film consisting of the emission structure By injecting the cushion member 230 into the center radiating space 241 of the 220 and the upper circuit board 240, each laminated object film by the radiating structure of the light emitting film 220 and the upper circuit board 240. By giving independent elastic force to, it is possible to reliably restore the position to the original position, so that the switch from the contact state of the contact switch to the release state can be more surely made after the release of the pressing force.

this is. Since the gap between the pair of contact switches 270 is minute, the restoring force by the self-elastic force is delayed or the immediate response of the elastic force is lost after the contact state, so the contact state is quickly switched from the on state to the off state. This delay can compensate for the disadvantages that cause the button to malfunction.

As described above, the gap between the pair of contact switches 270 through the cushion member 230 can be minimized, and the cushion member 230 is absorbed by the cushion member 230 during the push operation of the key button. ) To make the push operation of the button smooth.

In particular, as the gap between the pair of contact switches 270 through the cushion member 230 is approached to a minimized state, it is possible to input the button input signal only with a minute pressing pressure as in the touch screen method, so that the excessive amount of key buttons The contact switch 270 due to the push operation may be damaged to prevent a phenomenon of causing a malfunction.

In addition, there is an effect that the recognition operation of the button can be performed smoothly even with the same touch or pressing force, such as a touch screen method for grasping the contact portion by the infrared ray grating.

As mentioned above. The key button structure of the touch button method of the present invention is effective by enabling a button input function even at a minute pressing force of the button by minimizing the mutual gap of the pair of contact switches.

In addition, the touch-type key button structure of the present invention allows the light emitting film and the upper circuit board to be formed in a symmetrical reflection structure in a laminated structure forming a key button so as to provide a more stable elastic force so that the contact state of the changeover switch. It is possible to prevent the malfunction and signal error caused by the operation of the key button by allowing the device to react immediately.

In addition, the touch-type key button structure of the present invention forms a discharge space in the space between the light emitting film and the upper circuit board central portion of the discharge structure to prevent the damage to the contact switch even under excessive pressing force by softening the cushion member. There is an effect to provide a sense of touch.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

Claims

Transparent protective film with the letter indication on the front,

A light emitting film laminated on the lower portion of the protective film, the light emitting source to diffuse light into the protective film and to illuminate to identify letters or numbers printed on the protective film;

A cushion member protruding from and fixed to the lower center of the light emitting film;

An upper circuit board stacked in a state of being bent in close contact with an edge of the light emitting film and a cushion member;

A lower circuit board stacked below the upper circuit board with a predetermined interval therebetween;

A double-sided adhesive film attached to edge portions corresponding to the upper circuit board, the lower circuit board, the protective film, and the light emitting film so as to generate a mutual gap, and to be integrally bonded to each other;

A touch-type key button structure, characterized in that composed of a pair of contact switches that are respectively spaced apart corresponding to the upper printed board and the lower printed board.

The method of claim 1,

The light emitting film and the upper circuit board are made of a mutually symmetrical radiation structure and the touch-type key button structure, characterized in that configured to introduce the cushion member into the interior of the discharge space.