KR200367833Y1 - A keypad for cellular phone - Google Patents

Abstract

The present invention provides a keypad for a mobile phone that can be applied to a dome switch assembly having a reflection function to provide excellent backlighting and light diffusing effects. The keypad is spaced on top of the dome switch assembly and is formed of a transparent material, a plurality of keys integrally formed in the body so as to correspond to each switch of the dome switch assembly, and each switch of the dome switch assembly. A plurality of bosses integrally formed in the key to pressurize, and reflect or diffuse light emitted from the light emitting element and interact with the reflecting means of the dome switch assembly to reflect or diffuse light continuously and repeatedly. It consists of a reflective film integrally embedded in.

Description

Keypad for mobile phone {A keypad for cellular phone}

The present invention relates to a keypad for a mobile phone, and more particularly, to a keypad for a mobile phone that can be applied to a dome switch assembly having a reflecting means to provide excellent backlighting effect and light diffusion effect.

Generally, but not limited to, a mobile phone or a mobile phone is provided with a plurality of keys each having various functions, each of which is integrally formed by a keypad. Of course, each key is slightly protruded outward so that the user or caller can select and press the required key to communicate or obtain necessary information.

On the other hand, the keypad of most mobile phones or mobile phones are materials such as transparent or silver polyurethane, silicone, PET, P.C. In addition, as illustrated in FIGS. 1A and 1B, most mobile phones 1 or mobile phones are keypads provided with a plurality of keys 2a to accurately identify and operate keys even at night or where no external light source is provided. The bottom of (2), more specifically, the printed circuit board 3 is provided with a plurality of light emitting elements 4 such as LEDs. In addition, a dome switch assembly having a plurality of metal dome switches 5a corresponding to the respective keys 2a to pressurize a predetermined portion provided on the printed circuit board 3 on the surface of the printed circuit board 3 ( 5) The dome switch panel is attached. When opening the mobile phone or operating the key 2a according to such a configuration, light is emitted from the light emitting element 4 so that the number or letters printed on the key 2a can be recognized by the back lighting effect. It is. That is, light emitted from the light emitting element 4 provided on the circuit board 3 is supplied to the bottom or the periphery of each key 2 as an arrow to identify letters or numbers indexed on the key 2. It can be.

However, such a conventional mobile phone or mobile phone has been shown to cause some problems. First, in the case of a conventional mobile phone, since backlighting is provided only by a limited pure light emitting area of the light emitting device, it is not possible to provide sufficient and uniform light to each key of the keypad, so that each key cannot be recognized effectively. have.

Accordingly, since a plurality of light emitting elements must be installed for sufficient backlighting, there is a problem in that the power consumption is excessive and the service life of the battery is shortened.

In addition, since a plurality of light emitting devices must be installed, the manufacturing process is complicated, the structure is complicated, and the installation space must be secured, as well as the manufacturing cost is increased.

Therefore, the present invention is designed to solve the above-mentioned problems, and the main purpose of the present invention is to cooperate with a dome switch assembly having a reflecting means with only a few light emitting elements, so that a sufficient and uniform backlighting effect is provided to the entire keypad or each key. To provide a keypad for a mobile phone that can provide.

Another main purpose of the present invention is to provide a keypad for a mobile phone whose outer surface can be cleanly finished.

Figure 1a is a perspective view showing a typical mobile phone, Figure 1b is a partial enlarged cross-sectional view showing a backlight state as a cross-sectional view taken along the line b-b of Figure 1a.

Figure 2 is a plan view showing a dome switch assembly to which the keypad according to the present invention is applied.

3A and 3B are enlarged cross-sectional views, respectively, along line III-III of FIG. 2;

Figure 4 is a schematic perspective view showing a keypad for a mobile phone according to the present invention.

5A and 5B are enlarged cross-sectional views illustrating a backlighting state of a mobile phone in a state where a keypad for a mobile phone according to the present invention is applied to FIGS. 3A and 3B.

♣ Explanation of symbols for the main parts of the drawing ♣

10: dome switch assembly 12: substrate paper

14: adhesive layer 16: film

18: adhesive 20: dome switch

22: through hole 30: printed circuit board

32: light emitting element 40: main body

42: key 44: boss

50: reflective film

These objects are provided in a keypad for a mobile phone, which is embedded in a mobile phone and attached to a printed circuit board on which one or more light emitting elements are installed, and which is disposed on top of a dome switch assembly having light reflecting means, wherein the gap is formed on the top of the dome switch assembly. It is disposed to leave, the body formed of a transparent material; A plurality of keys integrally formed in the body so as to correspond to respective switches of the dome switch assembly; A plurality of bosses integrally protruding from the key to press each switch of the dome switch assembly; And a reflecting film integrally embedded in the main body for reflecting or diffusing light emitted from the light emitting element and interacting with the reflecting means of the dome switch assembly to reflect or diffuse light continuously and repeatedly. It can be achieved by a keypad for a mobile phone.

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

First, referring to FIGS. 2 and 3A, a dome switch assembly 10 to which a keypad for a mobile phone according to the present invention is applied includes a substrate paper 12 attached to a printed circuit board embedded in a mobile phone. An adhesive layer 14 is formed on the bottom of the substrate 12 so that the substrate 12 can be actually bonded to the printed circuit board.

The surface of the substrate 12 is attached with a film 16 forming the appearance of the dome switch assembly. Of course, it is preferable that the adhesive 18 be used for the attachment of the film 16.

In particular, according to the feature of the dome switch assembly 10 according to the present invention, the film 16 is preferably formed of a reflective material capable of reflecting or diffusing light emitted from the light emitting device described later in all directions. That is, the film 16 is preferably formed of a reflective film or a light diffusing film.

Meanwhile, according to FIG. 3B, when the film 16 is formed of an antireflective film, the outer surface of the film 16 may include a light reflecting material or a light reflecting material to reflect or diffuse light emitted from a light emitting device described later in all directions. The reflective layer 24 formed of the light diffusing material may be separately provided. Of course, the reflective layer 24 is preferably formed of a film, but may be formed by applying to the surface of the film, such as ink.

On the other hand, the dome switch assembly 10 corresponds to each key installed on the keypad of the mobile phone, and a plurality of elastic metal dome switches 20 for reversibly contacting the corresponding portions of the printed circuit board are installed. Each dome switch 20 is preferably attached to the back side of the film 16, which is a corresponding portion of the substrate paper 12 cut away so that the dome switch is installed. In addition, it is preferable that the substrate paper 12 of the portion where the dome switch 20 is attached to the film 16 is cut out so as to secure a space for operation or repulsion of the dome switch 20. Of course, in the lower center of each dome switch 20, a contact 20a for actually pressing the contact portion of the printed circuit board is formed.

In addition, the dome switch assembly 10 has a through hole through which a portion of each light emitting element installed in the printed circuit board may be penetrated or provided to provide light to each key provided in the keypad in a backlighting manner as described below. It is preferable that 22 be perforated.

As shown in FIGS. 5A and 5B, the dome switch assembly 10 is attached to a printed circuit board 30. The printed circuit board 30 is provided with a light emitting element 32 such as a plurality of LEDs. In addition, when the dome switch assembly 10 is applied, the number of the light emitting elements 32 may be reduced by the reflection effect or the diffusion effect of the film 16, and the installation position thereof may also be at the center of the printed circuit board 30. Even if the installation is limited to this can provide a sufficient backlighting effect.

As shown in Figure 4, the keypad according to the present invention has a main body 40 formed of a transparent material. The main body 40 has a key 42 corresponding to each dome switch 20 of the dome switch assembly 10 described above, and is integrally provided with the key 42 and is actually a corresponding dome switch 20 of the dome switch assembly. ) Is provided with a boss 44 for pressing.

In particular, according to one feature of the present invention, it is preferable that the reflective film 50 is embedded in the main body 40 of the keypad in order to more effectively achieve the reflection or light diffusion function of the light emitted from the light emitting device. The reflective film 50 is preferably provided in the entire body 42 except for the key 42 and the boss 44. On the other hand, the reflective film 50 is preferably formed of the same or similar film to the film 16 constituting the dome switch assembly 10, but may be formed of a light diffusing film such as a prism panel.

As shown in Figures 5a and 5b, the keypad for a mobile phone according to the present invention is disposed so as to be in contact with the four parts of the dome switch assembly 10 installed in the mobile phone. According to this arrangement, the light emitted from each of the light emitting elements 32 provided on the printed circuit board 30 is transferred to the dome switch assembly 10 and the main body of the keypad by the light reflection or light diffusing function of the film 16. 40) The user can clearly recognize and manipulate each key by reflecting or diffusing the entire surface between the bottom surfaces and being emitted to the outside through each transparent key 42. In particular, the light emitting effect through the key 42 may be improved by the reflection of light between the film 16 or the reflective layer 24 provided in the dome switch assembly 20 and the reflective film 50 of the keypad according to the present invention. It is.

Hereinafter, the operation of the keypad for a mobile phone having the structure as described above and the operation effect thereof will be described in detail.

First, as shown in FIGS. 5A and 5B, in a state in which a keypad according to the present invention is installed on an upper portion of a dome switch assembly 10, each of which is installed on a printed circuit board 30 when a cover of a cellular phone is opened or a key is pressed. Power is supplied to the light emitting device 32 to emit light in three dimensions.

Among the light emitted in this way, the light directed toward the surface of the film 16 or the reflective layer 24 of the dome switch assembly 10 is reflected or diffused therefrom and is reflected in the dome switch assembly 10 and the main body 40 of the keypad. It is entirely reflected or diffused between the films 50. The light is supplied to each transparent key 42 provided thereon by the reflection or diffusion of the light to the entire body 40 of the keypad so that the letters, numbers, signs, etc. indexed to each key 42 are correct. It can be recognized quickly. Accordingly, the user can operate the mobile phone exactly as he wants by manipulating each key.

In particular, since the reflective film 50 is inherent in the main body 40 of the keypad according to the present invention, it is possible to receive better backlighting. That is, when the user opens the cover of the cellular phone or presses a key to use the cellular phone, power is supplied to each light emitting element 32 installed on the printed circuit board 30 to emit light in three dimensions. Some of the light directed to the body 40 provides light to its respective keys 42 and is reflected by the reflective film 50 inherent in the remaining keypad body 40. The reflected light is directed toward the film 16 or the reflective layer 24 of the dome switch assembly 10, and the light is reflected back to the reflective film 50 of the main body 40 of the keypad to reflect other keys 42. Light). As such, the light emitted from the light emitting element 32 is continuously repeated by the film 16 or the reflective layer 24 and the reflective film 50 provided therebetween between the dome switch assembly 10 and the main body 40 of the keypad. This is reflected and diffused to provide sufficient and uniform light to each key 42 provided in the main body 40 of the keypad.

Therefore, even if a small number of light emitting devices such as LEDs are installed in the center of the printed circuit board, the mobile phone user can clearly and accurately recognize the index indexed on each key by reflecting or diffusing the light emitted therefrom.

As a result, according to the keypad for a mobile phone according to the present invention, when applied to a mobile phone with a dome switch assembly having a reflection function, it interacts with the light emitting means of the dome switch assembly to reflect light emitted from a light emitting element such as a few LEDs. Alternatively, it is possible to provide a sufficient and uniform backlighting effect on each of the keys provided in the keypad by diffusing, thereby improving the productivity and reliability.

In addition, since the number of light emitting devices can be reduced, power consumption is low, service life is extended, the manufacturing process is simple, the structure is simple, and manufacturing cost is low.

Moreover, when applied to a mobile phone, adding a reflective film to the bottom of the keypad can continuously or repeatedly reflect light to manufacture a mobile phone that provides more effective backlighting, thereby improving applicability and maintaining a clean appearance. There is an effect that can be.

Although a preferred embodiment according to the present invention has been described above, it will be understood by those skilled in the art that various modifications and variations can be made without departing from the scope of the appended claims.

Claims (3)

A keypad for a mobile phone embedded in a mobile phone and attached to a printed circuit board on which one or more light emitting elements are installed and disposed on a dome switch assembly having light reflecting means, A main body disposed at an upper portion of the dome switch assembly and formed of a transparent material; A plurality of keys integrally formed in the body so as to correspond to respective switches of the dome switch assembly; A plurality of bosses integrally protruding from the key to press each switch of the dome switch assembly; And And a reflecting film integrally embedded in the main body to reflect or diffuse light emitted from the light emitting device and to reflect or diffuse light continuously and repeatedly by interacting with reflecting means of the dome switch assembly. Keypad for mobile phones. The keypad of claim 1, wherein the reflective film is embedded in the entire body except for the key and the boss. The keypad of claim 1, wherein the reflective film is formed of one of the same materials as the reflecting means provided in the dome switch assembly, a prism panel, a light reflecting film, and a light diffusing film.