KR101255010B1 - Key pad having key button part injected in a body and mobile terminal having the same - Google Patents

Abstract

According to the present invention, a plurality of key buttons and a keypad button part made of a plastic resin material which are connected to a lower end of the key button so that the key button protrudes upwards are integrally injection-molded with a key button compartment for partitioning the key button and the key button. Wow; An integrated keypad button unit is positioned below the keypad button part so as to be interlocked with the key button when the key button is pressed, and includes a keypad support part formed with a pressing protrusion protruding downward from the bottom of the point corresponding to the key button. It has a keypad and a mobile terminal having the same.

Polycarbonate, keypad, injection, interlocking groove, key button compartment

Description

KEY PAD HAVING KEY BUTTON PART INJECTED IN A BODY AND MOBILE TERMINAL HAVING THE SAME}

1 is a perspective view of a keypad button portion of the first embodiment.

Fig. 2 is a schematic diagram when a font is formed in the keypad button portion of the first embodiment;

Figure 3 is a rear perspective view of the keypad support of the first embodiment.

Figure 4 is a combination of the keypad button portion and keypad support of the first embodiment.

5 is a cross-sectional view taken along the line AA ′ of FIG. 4.

6 is a schematic cross-sectional view of Embodiment 2. FIG.

<Description of the symbols for the main parts of the drawings>

100: keypad button part 110: key button

112: blind process 120: key button compartment

200: keypad support portion 210: push projection

220: Interlocking auxiliary groove

300: Dome switch

400: printed circuit board 410: signal contact

420: spacer 430: light emitting lamp

F: Front Housing

The present invention relates to a keypad for signal input and a mobile terminal having such a keypad.

Keypad formed grooves, such as the character portion is applied to a mobile phone, PDA, etc. In addition, it can be applied to any industrial field where a key button engraved with the character portion is used.

In the case of mobile phones, due to the tendency to thin and shorten electronic products, thin phones having a thin thickness have recently been released. For this purpose, the conventional thick key button portion of the keypad must be essentially thin.

Conventionally, a keypad consisting of a keypad button part and a keypad support part has injection molding of a plurality of keypad buttons separately, and a keypad button part is integrally formed of metal of SUS material.

The present invention is to provide a keypad useful for slimming the mobile terminal and a mobile terminal having the same.

The present invention is to provide a key button with a beautiful appearance and a mobile terminal having the same.

The present invention is to provide a user-friendly, malfunction-free keypad and a mobile terminal having the same.

According to the present invention, a plurality of key buttons and a keypad button part made of a plastic resin material which are connected to a lower end of the key button so that the key button protrudes upwards are integrally injection-molded with a key button compartment for partitioning the key button and the key button. Wow; An integrated keypad button unit is positioned below the keypad button part so as to be interlocked with the key button when the key button is pressed, and includes a keypad support part formed with a pressing protrusion protruding downward from the bottom of the point corresponding to the key button. It has a keypad.

In the present invention, the keypad support portion may be formed in the interlocking auxiliary portion dug inward at any one or more of the points corresponding to the key button compartment.

In the present invention, the interlocking auxiliary portion is also a linear interlocking auxiliary groove formed on the back.

In the present invention, the linkage assistant is also a linkage assistant penetrating from the top to the back.

In the present invention, the keypad button portion is made of polycarbonate; The thickness of the key button of the keypad button portion is 0.4 mm, the thickness of the key button compartment is 0.2 mm; The thickness of the portion where the pressing protrusion is formed in the keypad support portion is 0.5 mm, and the thickness of the remaining portion is 0.25 mm.

On the other hand, the present invention is a mobile terminal including any one of the keypad; A front housing having the keypad mounted therein and having an exposure hole through which an upper surface of the keypad button is exposed; A dome switch provided inside the front housing and provided below the push protrusion; A printed circuit board mounted inside the front housing to accommodate the dome switch; The present invention also relates to a mobile terminal including a signal contact portion provided in the printed circuit so as to generate a signal by contact with the dome switch.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

Example 1

Embodiment 1 is an embodiment of a keypad according to the present invention. Figure 1 is a perspective view of the keypad button portion of the first embodiment, Figure 2 is a schematic diagram when the font is formed in the keypad button portion of the first embodiment, Figure 3 is a rear perspective view of the keypad support portion of the first embodiment, Figure 4 FIG. 5 is a cross-sectional view taken along line AA ′ of FIG. 4.

Referring to FIG. 1, an embodiment according to the present invention has a keypad button unit 100. The keypad button unit 100 has a key button 110 and a key button compartment 120.

Referring to FIG. 1, a plurality of key buttons 110 are formed to protrude upward, and a user can identify a position of the key button by a sense without pressing the key button 110 so as to press a necessary key button 110. Protruding blind projection 112 to the key button.

Referring to FIG. 1, the key button compartment 120 is formed such that the key button 110 protrudes upward by connecting the key button 110 and the lower end of the key button 110. That is, the thickness of the key button compartment 120 is formed thinner than the thickness of the key button 110 to partition the key button 110 and the key button 110.

On the other hand, the keypad button portion 100 is a plurality of key buttons 110 and the key button compartment 120 is integrally injection molded, the material is polycarbonate (poly carbonate).

2, the width of the key button compartment 120 is injection molded to 0.2mm.

Referring to FIG. 5, the thickness of the key button 110 is 0.4 mm, and the thickness of the key button compartment 120 is injection molded to 0.2 mm.

Referring to FIG. 2, a font is formed on an upper surface of the key button 110 to recognize input numbers or letters.

Referring to FIG. 3, an embodiment of the present invention has a keypad support 200.

Referring to FIG. 4, the keypad support part 200 is coupled to the rear surface of the keypad button part 100. The keypad support 200 is fastened to the back of the keypad button unit 100. As the fastening means, an adhesive tape or an adhesive is usually used.

Referring to FIG. 3, the keypad support part 200 has a push protrusion 210 protruding downward from a rear surface, that is, a bottom part. The push protrusion 210 is formed at a point corresponding to the central portion of each key button 110 when the keypad support portion 200 is coupled to the lower portion of the keypad button portion 100.

Referring to Figure 3, the keypad support 200 is formed with an interlocking auxiliary groove 220. Interlocking auxiliary groove 220 is formed in the shape of a straight groove on the back of the keypad support 200. The keypad support part 200 is formed at a point corresponding to each key button compartment 220 when the keypad support part 200 is coupled to the lower part of the keypad button part 100.

Referring to FIG. 4, the thickness of the portion where the pressing protrusion 210 is formed in the keypad support portion 200 is 0.5 mm, and the thickness of the remaining portions is 0.25 mm.

On the other hand, the keypad support is formed of a urethane material in consideration of hardness and elasticity.

The operation of one embodiment described above will be described.

Referring to FIG. 6, when the key button 110 exposed to the front housing F is pressed, the push protrusion 210 corresponding thereto is linked downward. At this time, since the key button compartment 120 is formed, the covertons other than the pressed key button 110 are reduced in width to be linked downward. In addition, the keypad support portion 200 is formed with an interlocking auxiliary groove 220, so that the pressing protrusions other than the pressing protrusion 210 corresponding to the pressed key button 110 are reduced in width to interlock downward.

Referring to FIG. 6, when the push protrusion 210 interlocks downward, the push protrusion 210 presses the dome switch 300 positioned below the dome switch 300 to be in contact with the signal contact portion 410. The signal is sent through the circuit board 400.

On the other hand, when the key buttons are individually injection molded and fastened to the keypad support portion, there is a problem in the flatness of the keypad, so a separate structure such as SUS was required on the upper surface of the key battress support portion. That is, since the key buttons and the key buttons are free, the flatness of the entire keypad is reduced. However, in the present invention, since the keypad button part 100 is integrally injection molded, there is no problem in the flatness of the keypad, and there is no need for a separate structure for maintaining the flatness, so that the thickness of the keypad is not thickened.

In addition, when the keypad button part is integrally injection-molded with SUS metal material, the keypad button part has a curved shape or various colors due to the characteristics of the material. However, the present invention uses a polycarbonate of a plastic resin material to implement a curved shape. It is easy to implement a variety of colors.

In addition, when the keypad button portion is made of SUS metal material, the user feels or feels when the key button is clicked, but the present invention uses a polycarbonate made of plastic resin, so the user feels or feels good.

In other words, the present invention can be made by injection molding the keypad button portion integrally thin with a polycarbonate plastic resin material to reduce the thickness of the keypad and at the same time to improve the user's feeling, feel and feel when operating the key button, can implement a variety of colors Will be.

In the case of the first embodiment, the shape of the interlocking auxiliary groove 220 is a straight groove, but in another embodiment, it may be a circular groove or an elliptical groove.

In the first embodiment, the interlocking auxiliary groove 220 is formed on the back of the keypad support 200, but in another embodiment, it may be formed on the upper surface of the keypad support.

In the first embodiment, the interlocking auxiliary groove 220 is formed at all points corresponding to the respective key button compartments 220, but may be formed at points corresponding to some key button compartments. . That is, referring to Figures 2 and 3 may be formed only at the point corresponding to the key button compartment of the numeric key 5 key button and the 8 key button corresponding to the center portion of the keypad.

In the first embodiment, the interlocking auxiliary part for preventing the malfunction of the push protrusion 210 is an interlocking auxiliary groove 220. However, in another embodiment, the interlocking auxiliary part may be an interlocking auxiliary hole penetrating from the upper surface of the pad support part to the back surface. have.

In the case of Example 1, the keypad support portion is made of urethane, but in another embodiment, the keypad support may be formed of the same material as that of the conventional keypad. Therefore, it may be formed of a silicon material or the like.

Example 2

Embodiment 2 relates to a mobile terminal including the keypad of Embodiment 1. 6 shows a schematic cross-sectional view of Example 2. FIG.

Referring to FIG. 6, Embodiment 2 has a front housing F in which the keypad of Embodiment 1 is mounted.

Referring to FIG. 6, an upper surface of the front housing F is formed with an exposed hole (not shown) through which the upper surface of the key button 110 is exposed.

Referring to FIG. 6, the keypad is mounted on the front housing F such that the upper surface of the key button 110 is exposed to the outside and the push protrusion 210 faces downward.

Referring to FIG. 6, the bottom surface of the front housing F is provided with a printed circuit board 400.

Referring to FIG. 6, a signal contact portion 410 is formed on the printed circuit board F to generate a predetermined signal by contact with the push protrusion 210.

Referring to FIG. 6, a cylindrical spacer 420 surrounding the signal contact portion 410 is placed in the printed circuit board 400.

Referring to FIG. 6, a dome switch 300 is placed on an upper surface of the spacer 420. The dome switch 300 is formed to be bent and deformed downward by contact with the push protrusion 210 to be in contact with the signal contact portion 410.

Meanwhile, referring to FIG. 6, the spacer 420 is provided with a light emitting lamp 430 that passes through the key button 110 or emits light through an exposure hole (not shown).

The variation of the keypad of the second embodiment is the same as that described in the first embodiment.

In addition, since the operation of the second embodiment is the same as described in the operation of the first embodiment, description thereof is omitted.

The present invention has the advantage that there is no malfunction due to the pressing of the key button other than the purpose of the push button other than the push protrusion corresponding to the pressed key button is formed because the key button compartment and the interlocking auxiliary groove is formed.

In the present invention, since the keypad button part is integrally injection molded, there is no problem in the flatness of the keypad, and there is no need for a separate structure for maintaining flatness.

Since the present invention uses polycarbonate made of a plastic resin material, it is easy to implement a curved shape and has an advantage of implementing various colors.

The present invention uses a polycarbonate of a plastic resin material, there is an advantage that the user feels or feels good.

Claims (7)

First Layer; And A second layer located below the first layer; Including, A plurality of first protrusions protruding in a first direction is formed on a first surface of the first layer. A plurality of second protrusions protruding in a second direction opposite to the first direction is formed on the first surface of the second layer. A second surface opposite the first surface of the first layer is attached to a second surface opposite the first surface of the second layer, The first surface of the first layer is formed with a first depression recessed in the second direction between the adjacent first projection, The first surface of the second layer is formed with a second depression recessed in the first direction between the adjacent second protrusions, And the first protrusion overlaps the second protrusion, and the first depression overlaps the second depression. The method of claim 1, And the width of the second layer is greater than the width of the first layer. The method of claim 1, The thickness at the first protrusion of the first layer is thicker than the thickness at the first depression, And wherein the thickness of the second layer in the region between adjacent second depressions is thicker than the thickness of the second layer at the second depressions. The method of claim 1, The keypad of claim 1, wherein at least one of the plurality of first protrusions is further formed to protrude in the first direction. The method of claim 1, And the second face of the first layer and the second face of the second layer are each flat. A mobile terminal having the keypad of any one of claims 1 to 5, A front housing in which the first layer and the second layer are mounted, and an exposure hole through which the top surface of the first protrusion is exposed is formed; A printed circuit board disposed below the second layer and having a dome switch corresponding to the second protrusion; And A signal contact portion provided in the printed circuit to generate a signal by contact with the dome switch; Mobile terminal comprising a. A front housing including a plurality of exposure holes; A keypad disposed in the front housing; And A printed circuit board disposed below the keypad; / RTI &gt; The keypad is First Layer; And A second layer located below the first layer; Including, A plurality of first protrusions protruding in a first direction is formed on a first surface of the first layer. A plurality of second protrusions protruding in a second direction opposite to the first direction is formed on the first surface of the second layer. A second surface opposite the first surface of the first layer is attached to a second surface opposite the first surface of the second layer, The first surface of the first layer is formed with a first depression recessed in the second direction between the adjacent first projection, The first surface of the second layer is formed with a second depression recessed in the first direction between the adjacent second protrusions, And the first protrusion overlaps the second protrusion, and the first depression overlaps the second depression.

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