KR100397657B1 - Structure for keypad having function of transmission luminescence - Google Patents

Abstract

The present invention is a transmission light function to the keypad to perform a variety of functions and at the same time to input the outgoing signal in various mobile phones such as cellular phones, PCS phones, CDMA-2000, IMT-2000 It is about the structure which gave.

In the present invention, a plurality of inorganic (or organic) materials are laminated and printed on an ITO film to apply an EL panel composed of a thin sheet to each key portion of the keypad, and then connect all of them through a power cable like a mesh. By making electrical contact with the battery of the mobile phone and by connecting it to the printed circuit board, it is possible to keep the brightness of the entire keypad constant while reducing its power consumption and diversifying the color of the EL panel. Provided is a keypad structure having a transmissive light function that allows various illuminations of the keypad to be expressed when used.

Description

Structure for keypad having function of transmission luminescence

The present invention relates to a keypad for performing a variety of functions and at the same time to input the outgoing signal in various mobile phones such as cellular phones, PCS phones, CDMA-2000, IMT-2000, In particular, the lighting of each key area of the keypad according to the state of use of the mobile phone is made from the light emission of the EL panel, which is an electroluminescent element (EL), thereby keeping the brightness of the entire keypad constant and reducing its power consumption. In addition, the present invention relates to a keypad structure having a transmissive illumination function that allows the illumination of the keypad to be variously expressed when using a mobile phone by varying the color of the EL panel.

In general, the keypad 100 of a mobile phone, as shown in Figure 1, after printing the letters, numbers, and colors on the back of the thermoplastic resin film presses the back of the key portion by pressing the insert into the inside while protruding to the surface The resin was produced by insert molding, and the thermoplastic resin film mainly used a polycarbonate (PC) film, which exhibits small shrinkage deformation due to heat and relatively good adhesion.

In addition, the keypad 100 is placed on a printed circuit board (PCB) of the mobile phone and arranged to arrange a plurality of LEDs 1 providing illumination of the keypad 100 therebetween.

At this time, the plurality of LEDs (1) is configured to be connected to the battery of the cell phone to enable power supply, the LED (1) when the user is using the cell phone while the keypad (100) It makes it easier to identify letters or numbers printed on the page.

However, since the LED 1, which is a lighting means of the mobile phone, is arranged in the center as shown in FIG. 1 between the keypad 100 and the printed circuit board, the edge illumination of the keypad 100 is the same. There is a disadvantage that the overall illumination of the keypad 100 is not constant, such as darker than the lighting of the center, thereby causing the user to look carefully at the letter or number confirmation of the keypad 100.

In addition, the LED (1) that provides the illumination of the conventional keypad 100 is not provided separately for each keypad 100, but is located between the keypad 100 and the printed circuit board, the light is keyed In relation to the method of irradiating with the pad 100, the inconvenience of not being able to configure the LED 1 in multiple colors was followed, resulting in the discontinuity of not satisfying the needs of the user.

In addition, the conventional LED (1) for providing the illumination of the keypad 100 has a disadvantage of excessive consumption of the power of the battery, thereby having a problem of shortening the use time of the mobile communication terminal.

Accordingly, the applicant of the present application solves the above-mentioned problems from the patent filed on July 20, 2001 (Application No. 2001-43884), and the present application is an improved patent for the prior patent.

That is, the present invention enables the illumination of each key portion of the keypad according to the use state of the mobile phone from the light emission of the EL panel, which is an electroluminescent element, while reducing the power consumption while maintaining the brightness of the entire keypad uniformly. The purpose is to provide a keypad structure with a transmissive lighting function that allows the illumination of the keypad to be variously expressed when using a mobile phone by diversifying the color of the EL panel.

That is, according to the present invention, a plurality of inorganic (or organic) materials are laminated and printed on an ITO film to apply an EL panel having a thin sheet shape to each key portion of the keypad by insert molding method, and then connected to a power supply line like a mesh. Through all the connections through the battery of the cell phone to make an electrical contact, as well as to configure the circuit board and the connection, to enhance the convenience when using the cell phone as well as to meet the needs of customers.

1 is a schematic view showing the structure of a keypad for a conventional mobile phone.

2 is a perspective view of a mobile phone using a keypad in which an EL panel is molded in an embodiment of the present invention.

Fig. 3 is an exploded view for insert molding an EL panel into each key protrusion of a keypad in a first embodiment of the present invention.

Fig. 4 is a connection state diagram of an EL panel applied to each key protrusion as a first embodiment of the present invention.

5 is a cross-sectional view taken along line C-C 'of FIG. 4 as a first embodiment of the present invention;

6 is a cross-sectional view taken along line D-D 'of FIG. 4 as a first embodiment of the present invention;

Figure 7 is an exploded view of the state in which the EL panel is coupled to the keypad in the second embodiment of the present invention.

8 is a cross-sectional view taken along the line E-E 'of FIG. 7 as a second embodiment of the present invention;

* Description of the symbols for the main parts of the drawings *

10; Transparent resin 20; EL panel

30; Power line 31; Panel connection line

40; Second contact portion 50; Contact pad

100; Keypad 100a; Key protrusion

200; Printed circuit board 200a; 1st contact part

Hereinafter, a first embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 2 is a perspective view of a mobile phone using a keypad in which an EL panel is molded in the first embodiment of the present invention, and FIG. 3 is an insert molding of an EL panel into each key protrusion of the keypad in the first embodiment of the present invention. Is an exploded view

4 is a diagram illustrating a connection state of an EL panel applied to each key protrusion as a first embodiment of the present invention, FIG. 5 is a cross-sectional view taken along line CC ′ of FIG. 4 as a first embodiment of the present invention, and FIG. 1 is a cross-sectional view taken along line DD ′ of FIG. 4.

2 to 6, after printing the letters, numbers and colors on the back of the thermoplastic film, the keypad having a plurality of key protrusions (100a) protruding to the surface by pressing the back of the key portion by a press In 100,

EL panel, which is an electroluminescent element, to provide transmissive illumination according to the use state of the mobile phone to each of the key protrusions 100a of the keypad 100 with letters and numbers printed on its surface on the inner bottom surface of each key protrusion 100a. Insert 20,

One (+) and negative (-) power lines 30 are connected to one EL panel 20 so that battery power is supplied, while the other EL panel 20 is connected to the power supplied from the power line 30. According to the panel connection line 31 so as to enable simultaneous light emission,

On the EL panels 20, a transparent resin 10 having a predetermined amount of a light diffusing agent added thereto is used to reflect the illumination around the key protrusion 100a and to prevent the EL panel 20 from being separated. Insert molding,

On the transparent resin 10, a second silicon-based material for switching the contact with the first contact portion 200a of the printed circuit board 200 when pressing the key protrusions 100a of the keypad 100. The contact portion 40 is formed.

Referring to Figures 2 to 6 attached to the operation of the first embodiment of the present invention configured as described above are as follows.

First, after printing letters, numbers, and colors on the back surface of the thermoplastic resin film, a keypad 100 having a plurality of key protrusions 100a protruded to the surface by pressing the back surface of the key portion is pressed.

Thereafter, the EL panel 20 as an electroluminescent element is inserted into the inner bottom surface of each of the key protrusions 100a protruding from the surface of the keypad 100.

In addition, the one EL panel 20 is connected to the power supply line 30 of plus (+) and minus (-) so that battery power is supplied, and the other EL panels 20 are connected to the power supply line 30. It is connected to the panel connection line 31 like a mesh so as to enable simultaneous light emission according to the supplied power.

Thereafter, the EL panel 20 is insert molded into the transparent resin 10 to which a predetermined amount of the light diffusing agent is added.

Then, the external separation of the EL panel 20 from the insert molding of the transparent resin 10 is prevented, and the EL panel 20 which is an electroluminescent element from the photoacid agent added to the transparent resin 10 is illuminated. When provided, the illumination light can be transmitted evenly reflected around the key protrusion (100a).

And, the upper side of the transparent resin 10 of the silicon material for switching the contact with the first contact portion 200a of the printed circuit board 200 when pressing the key protrusions (100a) of the keypad 100 When the second contact portion 40 is formed, the assembly of the keypad 100 applied to the mobile phone is completed.

Here, the second contact portion 30 may be made of a silicon material, but urethane or thermoplastic resin may be applied to facilitate the switching operation of the contact point.

Therefore, in the state in which the keypad 100 configured as described above is applied to the cellular phone, the cover of the cellular phone (in this case, it will be described as a flip type, but in the case of a folder method, it is considered to open a folder) or the keypad 100 Each of the key protrusions 100a is pressed to cause the second contact portion 40 to switch between the first contact portion 200a and the contact point of the printed circuit board 200.

Then, battery power is supplied to one EL panel 20 connected to the plus and minus power lines 30 among the EL panels 20 formed on the inner surface of the key protrusion 100a.

At this time, the EL panel 20 and the plurality of EL panels 20 connected to the power line 30 are connected to each other like a mesh through the panel connection line 30,

The other EL panel 20 also transmits the light emitted from the power supplied from the panel connection line 30 to the surface of each key protrusion 100a of the keypad 100, thereby allowing the user to From the light emission of the individual EL panel 20, letters and numbers printed on the surface of each key protrusion 100a of the keypad 100 can be more easily identified.

Here, since the light-diffusing agent is added to the insert-molded transparent resin 10 on each of the EL panels 20 so that the emitted light of each of the EL panels 20 can be diffused to the periphery, the key protrusions 100a are provided. ), As well as the surface between the key projection (100a) and the key projection (100a) is provided with a transmission light of the EL panel 20 to make the overall surface illumination of the keypad 100 more bright.

That is, in the present invention, the letters and numbers printed on the surface of each of the key protrusions 100a are provided with the transmission light from the individual EL panel 20. The brightness of the key pads 100a is constant on the surface of the keypad 100. As shown in FIG. 2, it is possible to solve the difference in luminance that appears when the illumination is provided by the ambient light emission of the LED.

Here, if the color of the EL panel 20 applied to the inner surface of each of the key protrusions (100a) is formed differently, the illumination of the keypad 100 appearing from different colors are expressed in various colors and original You can provide a feeling.

7 and 8 are second embodiments of the present invention. FIG. 7 is an exploded view of a state in which an EL panel is coupled to a keypad, and FIG. 8 is a cross-sectional view taken along line E-E 'of FIG.

For reference, the same parts as in the first embodiment of the present invention are denoted by the same reference numerals.

As shown in Figures 7 and 8, after printing the letters, numbers, and colors on the back of the thermoplastic resin film, the keypad having a plurality of key protrusions (100a) protruding to the surface by pressing the back of the key portion with a press In 100,

The inner surface of each of the key protrusions 100a is filled with insert molding a transparent resin 10 to which a predetermined amount of a light diffusing agent is added so that the light is reflected around the key protrusions 100a.

On the back side of the keypad 100 in which the transparent resin 10 is insert molded, each of the key protrusions 100a of the keypad 100 provides plus and minus (-) to transmit light according to the use state of the mobile phone. Closely contact the EL panel 20 connected like a mesh with the power supply line 30 and the panel connection line 31.

On the back surface of the EL panel 20, when the key protrusions 100a of the keypad 100 are pressed, the key protrusions are made of silicon so as to switch the contact with the first contact portion 200a of the printed circuit board 200. And a contact pad 50 having a number of second contact portions 40 corresponding to 100a.

That is, in the second embodiment of the present invention, after printing letters, numbers, and colors on the back side of the thermoplastic resin film, the keypad having a plurality of key protrusions 100a protruding to the surface by pressing the back side of the key portion by a press Make 100.

Thereafter, the transparent resin 10 is filled in the insert molding method on the inner surface of each of the key protrusions 100a protruding from the surface of the keypad 100.

In addition, the EL panel 20 connected to the back surface of the keypad 100 in which the transparent resin 10 is inserted molded like a mesh with a power supply line 30 and a panel connection line 31 of plus (+) and minus (-). In close contact with the first and second contact portions 200a of the printed circuit board 200 when the key protrusions 100a of the keypad 100 are pressed on the rear surface of the EL panel 20. A contact pad 50 having a number of second contact portions 40 corresponding to the key protrusion 100a as a silicon material is formed in close contact.

Subsequently, in the state where the keypad 100 is applied to the cellular phone, the cover of the cellular phone (in this case, a flip type, but in the case of a folder method is opened when opening the folder) or each key of the keypad 100 The protrusion 100a is pressed to switch the second contact part 40 formed on the contact pad 50 with the first contact part 200a of the printed circuit board 200.

Then, the battery power is supplied to one EL panel 20 connected to the plus and minus power line 30 among the EL panels 20 formed on the back surface of the key protrusion 100a.

At this time, the EL panel 20 and the plurality of EL panels 20 connected to the power line 30 are connected to each other like a mesh through the panel connection line 30,

The other EL panel 20 also transmits the light emitted from the power supplied from the panel connection line 30 to the surface of each key protrusion 100a of the keypad 100, thereby allowing the user to From the light emission of the individual EL panel 20, letters and numbers printed on the surface of each key protrusion 100a of the keypad 100 can be more easily identified.

Here, the inner surface of each of the key protrusions (100a) is inserted into the transparent resin 10 in which a small amount of light diffusing agent is inserted,

The transparent resin 10 allows the light emitted from each of the EL panels 20 to be diffused to the periphery, so that the surface of each of the key protrusions 100a, as well as between the key protrusions 100a and the key protrusions 100a. Transmissive illumination of the EL panel 20 is also provided on the surface so that the overall surface illumination of the keypad 100 can be made brighter.

Hereinafter, the same parts as in the first embodiment of the present invention will be denoted by the same reference numerals and redundant description thereof will be omitted.

As described above, the present invention laminates and prints various inorganic (or organic) materials on an ITO film to apply an EL panel composed of a thin sheet to each key portion of the keypad, and then connects the power line like a mesh. By making all the connections through the battery and making the electrical contact with the battery of the mobile phone as well as the circuit configuration with the printed circuit board, the brightness of the entire keypad is kept constant while reducing its power consumption and diversifying the color of the EL panel. When using a mobile phone, the lighting of the keypad provides various effects.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

Claims (2)

In the keypad having a plurality of key protrusions which printed letters, numbers and colors on the back side of the thermoplastic resin film and then pressed the back side of the key portion by a press to protrude to the surface. Inserting the EL panel, which is an electroluminescent element, on the inner bottom surface of each of the key protrusions so as to provide transmission illumination according to the use state of the mobile phone to each key protrusion of the keypad in which letters and numbers are printed on the surface. Connect plus and minus power lines to one EL panel to supply battery power, and connect the other EL panels with panel line like mesh to enable simultaneous light emission according to the power supplied from the power line. On top of each of the EL panels, a transparent resin containing a predetermined amount of light diffusing agent is inserted to insert the light diffusing agent to prevent the light from being reflected around the key protrusions, and the separation of the EL panels. The keypad having a transmissive light function is formed on the transparent resin by forming a second contact portion made of a silicon material which switches the first contact portion of the printed circuit board and the contact point when the respective key protrusions of the keypad are pressed. rescue. In the keypad having a plurality of key protrusions which printed letters, numbers and colors on the back side of the thermoplastic resin film and then pressed the back side of the key portion by a press to protrude to the surface. The inner surface of each of the key protrusions is filled with insert molding a transparent resin to which a predetermined amount of light diffusing agent is added so that illumination can be reflected around the key protrusions. On the back side of the keypad, which is molded with the transparent resin, the EL panel is closely connected to the EL panel connected like a mesh with a power line and a panel connection line of plus and minus to provide transmission light according to the use state of the mobile phone to each key protrusion of the keypad. On the back side of the EL panel, a contact pad having a number of second contact portions corresponding to the key protrusions made of silicon is formed in close contact with the first contact portion of the printed circuit board when the key protrusions of the keypad are pressed. Keypad structure having a transmissive light function characterized in that.