KR20090123449A - Led flash module in mobile terminal - Google Patents

Abstract

PURPOSE: An LED flash module of a mobile terminal is provided to improve space utilization and assembly of the mobile terminal by modulating the LED for the flash and components related to the LED into one. CONSTITUTION: A light emitting unit(20) includes a first printed circuit(22) and an LED(Light Emitting Diode)(26) mounted on the first printed circuit substrate. A connector unit(30) includes a connector terminal(34) detachably connected to a main board and a second printed circuit(32) mounting the connector terminal. A flexible printed circuit(41,42) connects the first printed circuit board and the second printed circuit board. A light emitting unit includes an LED driver(24) mounted on the lower surface of the first printed circuit board for driving the LED and an optical lens(27) covering the LED in the upper part of the first printed circuit board.

Description

LED flash module of mobile terminal {LED FLASH MODULE IN MOBILE TERMINAL}

The present invention relates to a light emitting device (LED) flash module of a mobile terminal, and more particularly, to an LED flash module installed together with a camera module in a mobile terminal such as a mobile phone.

In general, a light emitting diode is an element that emits light when electrons and holes meet at a p-n semiconductor junction. Conventionally, the light emitting diode has been mainly used as a light source of the backlight module, but recently, due to the many advantages of the light emitting diode, its application range is expanding.

For example, in a mobile terminal such as a mobile phone having a digital camera function, a flash lamp for providing a flash when photographing a subject in a dark environment is installed, and a light emitting diode is used as a light source of the flash lamp. In general, a mobile phone includes a casing, and inside the casing, a main board having electronic components and electronic circuits for processing many functions of the mobile phone is installed.

Conventionally, in installing a flash lamp using a light emitting diode in a mobile terminal such as a mobile phone, many components involved in the operation of the flash lamp are individually mounted and used in a main board and a driver board. In addition, an optical lens for collecting light separately from the flash lamp is provided to be part of the casing, for example.

Therefore, in the related art, many components including light emitting diodes, which are used for various operations of flash lamps, need to be separately installed when the terminal is assembled. Therefore, the assembly process is complicated, and interference by such components and space utilization by the components Degradation has been a problem. Also, there were many difficulties in matching the functions of each part.

Accordingly, the technical problem of the present invention is that a flash LED including a light emitting diode and many elements related to the LED are modularized into one, thereby improving the assemblability of the mobile terminal, increasing space utilization, and functions of the above elements. It is to provide an LED flash module of the mobile terminal, which is easy to match.

According to one aspect of the invention, there is provided an LED flash module installed inside the mobile terminal having a mainboard inside the casing. The LED flash module includes: a light emitting unit having a first printed circuit board and an LED mounted on an upper surface of the first printed circuit board; A connector unit having a connector terminal detachably connected to the main board and a second printed circuit board on which the connector terminal is mounted; And a flexible printed circuit board connecting the first printed circuit board and the second printed circuit board.

Preferably, the light emitting unit further includes LED driving means mounted on the bottom surface of the first printed circuit board for driving the LED. The light emitting unit may further include a lens installed to cover the LED on the first printed circuit board.

According to an embodiment of the present invention, the LED flash module further comprises a charge storage unit comprising a third printed circuit board and a capacitor mounted on the third printed circuit board, wherein the third printed circuit board and the third 1 Printed circuit boards are connected by flexible circuit boards.

Preferably, the casing includes a viewing window for emitting light from the LED to the outside, wherein the LED is mounted on an upper surface of the first printed circuit board to face the viewing window, and the capacitor is mounted on the third printed circuit. An upper surface of the substrate is mounted on the bottom surface of the third printed circuit board so as to be attached to the casing. In addition, the connector terminal is mounted on an upper surface of the second printed circuit board.

According to another aspect of the present invention, an LED flash module includes: a light emitting diode having a first printed circuit board, an LED mounted on an upper surface of the first printed circuit board, and an LED driving means mounted on a bottom surface of the first printed circuit board; A unit; A connector unit having a connector terminal detachably connected to the main board of the mobile terminal; And a flexible circuit board connecting the first printed circuit board and the connector unit.

According to the present invention, a flash LED including a light emitting diode and many elements related to the LED are modularized into one, thereby improving the assemblability of the mobile terminal, increasing space utilization, functions of the above elements, and flash emission. It has the effect of integrating the function and the LED drive function, the connection function with the motherboard, furthermore, the charge storage function and / or the light pattern control function into one module.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are provided as examples to ensure that the spirit of the present invention can be fully conveyed to those skilled in the art. Accordingly, the present invention is not limited to the embodiments described below and may be embodied in other forms. And, in the drawings, the width, length, thickness, etc. of the components may be exaggerated for convenience. Like numbers refer to like elements throughout.

1 and 2 are perspective views showing the LED flash module according to an embodiment of the present invention, Figure 3 is a state in which the LED flash module shown in Figures 1 and 2 installed inside the mobile phone to the mobile terminal One cross section.

1 to 3, the LED flash module according to the present embodiment, the light emitting unit 20 for providing a flash, and the light emitting unit 20 to the main board 3 of the mobile terminal electrically Connector unit 30 for connection. In addition, the LED flash module further includes a charge storage unit 10 by a stable supply of power. In addition, the LED flash module according to the present embodiment includes a first flexible circuit board 41 electrically connecting the light emitting unit 20 and the connector unit 30, the light emitting unit 20, and the charge storage unit 10. ) And a second flexible circuit board 42 for electrically connecting. In this case, the first and second flexible printed circuit boards 41 and 42 allow the LED flash module to be flexibly curved as a whole, so that the narrow installation space in the casing of the mobile terminal can be usefully used.

The light emitting unit 20 includes a first printed circuit board 22 and at least one LED 26 (shown well in FIGS. 2 and 3) mounted on an upper surface of the first printed circuit board 22. Include. In this case, the LED 26 may include a structure in which an LED chip emitting light at a p-n semiconductor junction is sealed by a housing and / or a transparent encapsulant while being electrically wired by, for example, a conductive wire. In addition, an optical lens 27 for condensing, for example, for condensing the LED 26 is mounted on an upper surface of the first printed circuit board 22. The optical lens 27 emits light generated from the LED 26 to the outside in a desired pattern. As another modification, the LED 26 may be a light emitting semiconductor chip mounted on the first printed circuit board 22 without being encapsulated by an encapsulant or a housing.

 In addition, the light emitting unit 20 further includes an LED driving means 24 (shown in FIG. 3) composed of a plurality of elements mounted on the bottom surface of the first printed circuit board 22. In this case, the LED driving means 24 may be a driving driver and a driving element including a coil, a resistor, a ceramic, tantalum and the like. By mounting the LED driving means 24 on the bottom surface of the first printed circuit board 22 on which the LED 26 is mounted, it is possible to omit the driver board that was separately required in the existing mobile terminal.

On the other hand, the connection between the light emitting unit 20 and the connector unit 30, both ends of the first flexible printed circuit board 41, the first printed circuit board 22 and the connector unit of the light emitting unit 20 It is possible by being physically and mechanically connected to the second printed circuit board 32 of 30. Circuit patterns are formed on the first flexible circuit board 41 that are responsible for the transmission of all electrical input and output signals required between the light emitting unit 20 and the connector unit 30.

The connector unit 30 includes a connector terminal 34 mounted on the bottom surface of the second printed circuit board 32. The connector terminal 34 is detachably fitted and connected to the connection terminal 3a provided on the upper surface of the main board 3 (see FIG. 3). The connector terminal 34 is. It is mounted on the upper surface of the second printed circuit board 32 and faces the same upward direction as the LED 26 on the upper surface of the first printed circuit board 22, but the first flexible circuit board 41 is substantially In a state of being bent at 180 degrees, the connection terminal 3a on the main mode 3 in the downward direction is directed.

On the other hand, the charge storage unit 10, which is necessary for supplying a stable power to the above-described LED (26), a capacitor mounted on the third printed circuit board 12 and the third printed circuit board 12 ( 14). In this case, the capacitor 14 is attached to the bottom surface of the third printed circuit board 12 so as to face the lower direction different from the LED 26. This is for attaching the upper surface of the third printed circuit board 12 to the casing 2, the details of which will be described next.

3 shows a casing 2 and a main board 3 of a mobile terminal. In addition, the main board 3 is mounted with other electronic components 4a, 4b, 4c that perform various functions of the mobile terminal. In the present specification, the term 'casing' refers to an upper casing of a mobile terminal in which a viewing window 2a is formed to allow light generated from the LED 26 of the light emitting unit 20 to be emitted to the outside.

3, the light emitting unit 20, the charge storage unit 10, and the second flexible circuit board 42 are located adjacent to the casing 2 as a whole. In addition, a part of the first flexible printed circuit board 41 is adjacent to the casing 2, and a part of the remaining first flexible printed circuit board 41 is bent 180 degrees and the main board 3 of the mobile terminal. In the adjacent position, the connector terminal 34 of the connector unit 30 is connected to the connection terminal 3a of the motherboard 3. The flexible circuit boards 41 and 42 allow individual and free movement between the components even though each component constituting the LED flash module is mounted on the rigid printed circuit board. This, as mentioned above, helps to assemble the LED flashlight module efficiently and conveniently in a narrow casing of the mobile terminal.

As mentioned above, the upper surface of the third printed circuit board 12 of the charge storage unit 10 is attached to the inner wall surface of the casing (2). Attaching and bonding the third printed circuit board 12 to the inner wall surface of the casing 2 is advantageous in terms of space utilization inside the casing, but the heat from the heat generating capacitor 14 is increased from the casing 2. It can also contribute to preventing the performance deterioration of the various components in the casing (2) by heat in that it is widely dispersed through.

In addition, the light emitting unit 20, the LED 26 of the upper surface of the first printed circuit board 22 toward the viewing window (2a), and further, the optical lens 27 covering the LED 26 Is part of which is housed in the see-through window 2a. The stepped shape of the optical lens 27 and the corresponding stepped shape of the see-through window 2a ensure a sufficient adhesion area between the case 2 and the optical lens 27. The optical lens 27 may be formed of a transparent plastic resin such as polycarbonate, acrylic, or epoxy, or a transparent glass material.

The present invention is not limited by the above embodiment and can be variously modified. For example, the capacitor 14 is mounted on the upper surface instead of the bottom of the third printed circuit board 12, or the connector terminal 34 is mounted on the second printed circuit. It may be considered to mount on the bottom of the substrate 32, not the top. In addition, the LED 26 may emit white light using a phosphor, and may emit pastel light instead of white light. In addition, without the phosphor, it may be to use a green, red and / or red LED chip.

1 and 2 are perspective views showing LED flash modules according to an embodiment of the present invention in different states.

3 is a cross-sectional view showing a state in which the LED flash module shown in Figures 1 and 2 installed in the mobile terminal.

Claims (9)

An LED flash module installed inside the mobile terminal having a main board inside the casing, A light emitting unit having a first printed circuit board and an LED mounted on an upper surface of the first printed circuit board; A connector unit having a connector terminal detachably connected to the main board and a second printed circuit board on which the connector terminal is mounted; And And a flexible printed circuit board connecting the first printed circuit board and the second printed circuit board. The LED flash module of claim 1, wherein the light emitting unit further comprises LED driving means mounted to a bottom surface of the first printed circuit board to drive the LED. The LED flash module of claim 1, wherein the light emitting unit further comprises an optical lens installed to cover the LED on the first printed circuit board. The method according to claim 1, wherein the light emitting unit, LED driving means mounted to the bottom of the first printed circuit board for driving the LED; And an optical lens installed to cover the LED on the upper surface of the first printed circuit board. The method of claim 1, further comprising a charge storage unit comprising a third printed circuit board and a capacitor mounted on the third printed circuit board, wherein the third printed circuit board and the first printed circuit board are disposed on the flexible printed circuit board. LED flash module, characterized in that connected by. The method of claim 5, wherein the casing includes a viewing window for emitting light from the LED to the outside, the LED is mounted on the upper surface of the first printed circuit board facing the viewing window, the capacitor is printed on the third LED flash module, characterized in that the upper surface of the circuit board is mounted on the bottom of the third printed circuit board to be attached to the casing. The LED flash module of claim 1, wherein the connector terminal is mounted on an upper surface of the second printed circuit board. A light emitting unit having a first printed circuit board, an LED mounted on an upper surface of the first printed circuit board, and an LED driving means mounted on a bottom surface of the first printed circuit board; A connector unit having a connector terminal detachably connected to a main board of the mobile terminal; And LED flexible module comprising a flexible printed circuit board connecting the first printed circuit board and the connector unit. The LED flash module of claim 8, further comprising an optical lens installed to cover the LED on an upper surface of the first printed circuit board.

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