KR20050113940A - Mobile communication terminal with a built-in type high luminance flash module - Google Patents

Abstract

The present invention relates to a mobile communication terminal having a high brightness embedded flash module.

The present invention provides a mobile communication terminal having a built-in camera module and a built-in flash module interlocked with the camera, wherein the built-in flash module comprises: a tube lamp; A reflector provided at the rear of the tube lamp; A flash lens provided at the front of the tube lamp; It provides a mobile communication terminal having a high brightness embedded flash module comprising a and a circuit board. In addition, the present invention is a component of the built-in flash module and the built-in camera module is formed as a single module on a circuit board, having a high brightness embedded flash module connected to the main control unit of the mobile communication terminal through one connector Provide a mobile communication terminal.

According to the present invention, it is possible to greatly increase the amount of luminance and to efficiently mount various components in a narrow space.

Description

Mobile Communication Terminal with a built-in type High Luminance Flash Module}

The present invention relates to a mobile communication terminal having a high brightness built-in flash module, and more particularly, to increase the amount of brightness in a mobile communication terminal in which a camera module and a flash module are embedded. The present invention relates to a mobile communication terminal capable of integrating a camera module and a flash module into one module to enable high capacity of a flash capacitor and miniaturization of a mobile communication terminal.

The function of the mobile communication terminal is not limited to the call, but is gradually expanding the range of functions such as the Internet, video watching, games, etc., and in recent years, the mounting of the built-in camera module is increasing.

 As the market for the built-in camera module of the mobile communication terminal grows as described above, differentiation from other mobile communication terminal cameras is required, and consumer demand is also diversified. Products are being developed to meet the various needs of these consumers. For example, the flash function (lighting in dark places or night shots), the macro function of the lens (manually changing the lens focus to near-field shooting), the digital zoom function (Enlarge specific parts of the image).

 In mobile phone cameras, light is the most important factor when taking pictures because the basic principle is to express the light and dark of objects to the image sensor using the light coming through the lens. In addition, in the case of a built-in camera for a mobile phone, unlike analog and digital cameras, light control using an aperture or a shutter speed is not possible, and therefore, a flash function is particularly required in low light.

Therefore, cell phone makers are currently working to implement flash functions in cell phones. Accordingly, cell phones equipped with light emitting diodes (LEDs) that can operate at low power and can be miniaturized are emerging. The LED has a great advantage in terms of processing speed, power consumption, and lifespan due to its semiconductor characteristics, but it is attracting attention in VGA (Video Graphics Array) phone cameras, but it is a mega phone that requires a mega image screen of more than mega level. In cameras, the luminance is low and there is a limit, and a large light emitter is urgently required.

As described above, a tube lamp may be used to meet the needs of a large emitter. In this case, a fresnel lens is generally used for a flash module.

In general, Fresnel lens is one of the condenser lens, and it has been used for lighthouse, but it is used for the light plate that brightens the viewfinder of the camera using plastic material, or it is used for overhead projector (OHP). It is used.

The light path of the Fresnel lens as described above is illustrated in FIG. 1, which will be described below.

In the flash module, the flash assembly 110 includes a tube lamp 111, a reflector 112, and a Fresnel lens 113. As shown, there is a tube lamp 111 used as a light emitter, the rear of the tube lamp 111 is provided with a reflector 112 for reflecting the light emitted backwards to the front. The front of the tube lamp 111 is provided with a Fresnel lens 113, the Fresnel lens 113 as shown in Figure 1 diffuses the light emitted to the front.

When the flash module including the Fresnel lens 113 is used in a mobile communication terminal that cannot control light using an aperture or a shutter speed, it is difficult to implement a clear picture as the light is diffused.

In other words, the flash module having the Fresnel lens as described above has a weak luminance, which makes it difficult to send intensive light evenly to the target object, thereby making it difficult to realize a clear picture.

Also, in the related art, a built-in camera and a built-in flash lens are respectively embedded in a mobile communication terminal as separate components, which are illustrated in FIGS. 2A and 2B.

In Figure 2 (a) is shown a flash module 100, which is provided with a flash assembly 110 composed of a tube lamp, a reflector and a Fresnel lens as shown. And a circuit board 120 having a flash driving circuit and a connector 130 extending from one end of the circuit and connected to a mother board or a main board of a mobile communication terminal. Drive the tube lamp. In this case, the flash driving circuit includes a flash capacitor 140.

In (b) of FIG. 2, the camera module 200 is shown. As shown, the camera lens 210 is provided on a flexible printed circuit board 220 and an image sensor (not shown) on the bottom of the FPC. Is provided. An extended end of the FPC is provided with a connector 230 to be connected with the main controller of the mobile communication terminal. In this case, the image sensor portion may be mounted on a printed circuit board (PCB), and a method of connecting an FPC to a PCB may be used, or a module may be manufactured using a Rigid-Flexible PCB in which the PCB and the FPC are integrated.

As such, in the related art, the camera module and the flash module are built as separate modules, and thus there is a problem in that a lot of space is required.

In addition, there is a problem that the amount of light emitted is also reduced because the capacity of the flash capacitor included in the flash driving circuit is no longer increased.

Therefore, there has been a demand in the art for a mobile communication terminal having a high brightness embedded flash module capable of preventing the above problem.

The present invention is to solve the above-mentioned conventional problems, by providing a flash lens (flash lens) in the flash module to prevent the light from spreading and to focus the light evenly on the target object, and also the built-in camera module and the built-in flash It is an object of the present invention to provide a mobile communication terminal having a high brightness built-in flash module capable of increasing the capacity of the flash capacitor and miniaturizing the mobile communication terminal by forming the module into one module and being connected to the main controller through one connector.

In order to solve the above object, the present invention provides a mobile communication terminal having a built-in camera module and a built-in flash module interlocked with the camera, the built-in flash module, the tube lamp; A reflector provided at a rear side of the tube lamp to reflect light emitted backward; A flash lens provided at a front side of the tube lamp to focus light emitted forwardly toward a subject; And a circuit board including a flash driving circuit driving the tube lamp and a connector extending from one end of the circuit and connected to a main board or a main board of a mobile communication terminal. It provides a mobile communication terminal having a high brightness embedded flash module comprising a.

In order to solve the above object, the present invention provides a mobile communication terminal having a built-in camera module and a built-in flash module interlocked with the camera, the built-in flash module, the tube lamp; A reflector provided at a rear side of the tube lamp to reflect light emitted backward; A flash lens provided at a front side of the tube lamp to focus light emitted forwardly toward a subject; And a circuit board including a flash driving circuit for driving the tube lamp and a connector extending from one end of the circuit and connected to a main control part of a mobile communication terminal. Includes, the built-in camera module, the camera lens; An image sensor converting an image formed by the camera lens into an electrical signal; And a circuit board having the image sensor mounted thereon, the connector extending from one end and connected to a main control part of the mobile communication terminal. And a component of the built-in flash module and the built-in camera module, which is formed as one module on one circuit board and has a high brightness embedded flash module connected to the main control unit of the mobile communication terminal through one connector. Provide a mobile communication terminal.

In the present invention having a high-intensity built-in flash module as described above, the flash lens is flat on the inner surface facing the tube lamp side, the same surface facing the subject side is convex, parallel to the central axis direction of the tube lamp. In one direction, the thickness is characterized by having a constant shape.

In this case, it is preferable that the outer surface of the flash lens has a larger radius of curvature at the center near the central axis of the tube lamp and a smaller radius of curvature at both ends far from the central axis of the tube lamp.

In addition, it is preferable that the tube lamp is a xenon lamp having a large light emission amount.

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

3 illustrates a flash module provided in a mobile communication terminal according to the present invention, and FIG. 4 illustrates a light path of a flash lens used in the present invention.

As shown in FIG. 3, the present invention is a flash module 10 having a high brightness embedded flash module, a flash assembly 10 including a tube lamp, a reflector, and a flash lens, and a flash driving circuit for driving the tube lamp, and extending from one end of the circuit. It includes a circuit board 20 having a connector 21 connected to the main control portion of the. In this case, the flash driving circuit may include a flash capacitor 22 for generating a high voltage in the tube lamp as shown.

As described above, the present invention includes a tube lamp having a high light emission amount and a flash lens that focuses the light emitted therefrom, thereby intensively sending light to an object, that is, a subject, and greatly improving luminance as compared with the related art. This will be described in more detail with reference to FIG. 4.

The flash assembly 10 is provided with a tube lamp 11 in the center, the reflector 12 is provided on the rear of the tube lamp (11). The reflector 12 serves to reflect the light emitted backward from the tube lamp 11 to the front.

In addition, the front of the tube lamp 11 is provided with a flash lens 13, which focuses the light emitted forward from the tube lamp 11 and the light reflected from the reflector 12 to the front toward the subject. It plays a role.

That is, the present invention has a larger luminous body than the LED by using the tube lamp, as well as having a luminance amount of about 3 times or more higher than the conventional by using the flash lens.

Here, the tube lamp 11 is driven by a flash drive circuit and a flash capacitor connected to the circuit board, and also connected to the main control part of the mobile communication terminal by a connector connected to the circuit board (see FIG. 3).

Here, as shown in FIG. 4, the flash lens 13 has a flat inner surface facing the tube lamp 11, a convex surface facing the subject side, and a convex surface of the tube lamp 11. In a direction parallel to the central axis direction, the thickness has a constant shape. This shape allows you to focus on the subject without diffusing light.

At this time, the outer surface of the flash lens 13 has a large radius of curvature near the central axis of the tube lamp 11 and a smaller radius of curvature at both ends far from the central axis of the tube lamp 11. It is preferably formed.

In addition, the tube lamp 11 preferably uses a xenon lamp having a large light emission amount. Generally, the xenon lamp emits light closest to natural light among various light sources, and puts a pair of electrodes in a quartz tube to cause discharge between the electrodes. Xenon lamps also have a large number of lamps up to several kW, and the gas pressure during lighting reaches 20 atm or more, and the luminous efficiency can reach 20 to 40 lm per W. This is much higher than the incandescent bulb's efficiency of 10 to 20 lm per watt.

As described above, the present invention collects the light emitted from the tube lamp and collects the light emitted from the tube lamp as a subject by providing a tube lamp and concentrating the light while overcoming the limitation of light emission of the existing LED while the mobile communication terminal goes to the mega level. Redistribution greatly increases the amount of luminance and has the advantage of realizing a clear picture.

5 and 6 illustrate the top and side surfaces of the camera module and the high brightness flash module integrated in the mobile communication terminal according to the present invention, respectively.

The present invention may be integrally provided with a built-in camera module and a built-in flash module interlocked with the camera. This is a way to increase the capacity of the flash capacitor in the flash module, and at the same time to meet the trend of miniaturization of mobile communication terminals.

That is, in the present invention, as shown in FIGS. 5 and 6, the components of the embedded flash module and the embedded camera module are formed as one module on one circuit board 20 ′ and one connector 21 ′. ) Can be connected to the main control unit (not shown) of the mobile communication terminal.

This will be described in more detail with reference to FIGS. 5 and 6. The built-in flash module includes a flash assembly (10 ') consisting of a tube lamp, a reflector and a flash lens, and a connector (21') and a flash capacitor (22 ') connected to a main control part (not shown) of a mobile communication terminal. Mounted at 40, they are connected to the circuit board 20 'equipped with a flash drive circuit for driving the tube lamp through the extended FPC 40.

Particularly in this case, since the flash capacitor 22 ', which had to be separately mounted on a separate circuit line in the related art, can be mounted on the circuit board 20', the required space can be reduced, and accordingly, the flash capacitor 22 ' There is no need to reduce the capacity of), which has the advantage of using a high capacity capacitor for high voltage.

As shown in FIG. 5, the built-in camera module includes an image sensor 32 and an image sensor 32 for converting an image formed by the camera lens 30 and the camera lens 30 into electrical signals. And a circuit board 20 'having a connector 21' extending from one end and connected to the main control part of the mobile communication terminal. In this case, the camera lens 30 is preferably mounted on the FPC by the camera housing 31.

Components of the built-in flash module and the built-in camera module configured as described above are formed as one module on one circuit board 20 ', and the main control unit of the mobile communication terminal is connected through one connector 21'. It is connected to city).

In addition, since the various components 50 embedded in the mobile communication terminal may be mounted on the circuit board 20 ′, the area required for separately embedding the various components 50 may be greatly reduced to meet the miniaturization.

In this case, various components such as a flash module may be mounted on the circuit board 20 'using a method such as surface mounted technology (SMT).

As described above, in the present invention, since the flash module and the camera module are integrally embedded through one circuit board, the circuit board, the tube lamp, and the flash capacitor of the flash module occupy a separate space, and the camera module also occupies a separate space. You will be able to solve the problem. In this case as well, the tube lamp and the flash lens are provided to concentrate the light, greatly increasing the amount of brightness, and has the advantage of realizing a clear picture.

The results of experiments comparing the luminance levels of the mobile communication terminal with the high brightness flash module according to the present invention configured as described above and the mobile communication terminal with the conventional Fresnel lens are as follows [Table 1] to [Table 3].

Table 1

[Table 2]

Table 3

[Table 1] to [Table 3] was measured by varying the distance to the luminance meter to 50cm, 100cm, 150cm, respectively, the voltage was kept constant at 3.3V.

 In Tables 1 to 3, experiments were carried out varying the drive current to 20, 30, 40, 50, 60, 80, 100 under the respective conditions as described above, and the light angles were 45 ° and 50 °, respectively. Experiment.

As a result, in Table 1, for example, the light angle is 45 ° and the driving current is 20. For example, the brightness is about 6.6 lux when the Fresnel lens is used, but about 21.2 lux when the flash lens is used. 3 to 4 times increased.

Similarly, in the case of the light angle of 45 ° and the driving current of 20 in Table 2, the brightness was increased to 1.7 lux with the Fresnel lens, while the brightness was increased to 5.3 lux with the flash lens. .

In Table 3, when the light angle is 45 ° and the driving current is 20, the brightness is 0.73 lux using the Fresnel lens, while the brightness is increased by more than 3 times to 2.4 lux when using the flash lens. Could.

In other words, it was found that the brightness of the flash module having the flash lens was about 3 to 4 times higher than that of the conventional Fresnel lens.

As described above, the present invention has a tube lamp and a flash lens, thereby concentrating light, greatly increasing the amount of luminance, and providing a clear picture.

The above has been described in detail with reference to the present invention, which is illustrative and does not limit the present invention.

The mobile communication terminal according to the present invention has a large amount of light emission by providing a tube lamp and a flash lens, and at the same time, it is possible to concentrate the light emitted from the tube lamp to a subject and greatly increase the amount of luminance.

In addition, according to the present invention, since the built-in camera module and the built-in flash module are formed as one module and connected to the main control part through one connector, the high capacity of the flash capacitor and the miniaturization of the mobile communication terminal can be achieved.

1 is a view of a Fresnel lens provided in a conventional mobile communication terminal.

2 (a) and 2 (b) are diagrams showing a camera module and a flash module built in a detachable type in a conventional mobile communication terminal.

3 is a view showing a high brightness flash module provided in a mobile communication terminal according to the present invention.

4 is a view of a flash lens provided in the mobile communication terminal according to the present invention.

5 is a top view illustrating a camera module and a high brightness flash module integrated in a mobile communication terminal according to the present invention.

6 is a side view illustrating a camera module and a high brightness flash module integrated in a mobile communication terminal according to the present invention.

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

100 ... Conventional Flash Module 110 ... Conventional Flash Assembly

111 ... tube lamp 112 ... reflector

113 ... Fresnel Lens 120 ... Circuit Board

130 ... connector 140 ... flash capacitor

200 ... Conventional Camera Module 210 ... Camera Lens

220 ... FPC 230 ... connector

10 ... flash assembly according to the invention 11 ... tube lamp

12 ... Reflector 13 ... Flash Lens

20, 20 '... circuit board 21, 21' ... connector

22, 22 '... Flash capacitor 30 ... Camera lens

31.Camera housing 32.Image sensor

40 ... FPC

Claims (8)

In the mobile communication terminal having a built-in camera module and a built-in flash module that is linked to the camera, The built-in flash module, the tube lamp; A reflector provided at a rear side of the tube lamp to reflect light emitted backward; A flash lens provided at a front side of the tube lamp to focus light emitted forwardly toward a subject; And A circuit board having a flash driving circuit for driving the tube lamp and a connector extending from one end of the circuit and connected to a main control part of a mobile communication terminal; Mobile communication terminal having a high brightness embedded flash module comprising a. The method of claim 1, The flash lens has a high brightness embedded flash module having a flat inner surface facing the tube lamp side, a convex surface facing the subject side, and having a constant thickness in a direction parallel to the central axis direction of the tube lamp. Mobile communication terminal having a. The method of claim 2, The outer surface of the flash lens has a high radius of curvature of the central portion close to the center axis of the tube lamp, the mobile communication having a high brightness embedded flash module characterized in that the radius of curvature of both ends far from the center axis of the tube lamp is smaller. terminal. The method of claim 1, The tube lamp is a mobile communication terminal having a high brightness built-in flash module, characterized in that the xenon lamp. In the mobile communication terminal having a built-in camera module and a built-in flash module that is linked to the camera, The built-in flash module, the tube lamp; A reflector provided at a rear side of the tube lamp to reflect light emitted backward; A flash lens provided at a front side of the tube lamp to focus light emitted forwardly toward a subject; And A circuit board having a flash driving circuit for driving the tube lamp and a connector extending from one end of the circuit and connected to a main control part of a mobile communication terminal; Including, The built-in camera module, the camera lens; An image sensor converting an image formed by the camera lens into an electrical signal; And A circuit board having the image sensor mounted thereon and having a connector extending from one end and connected to a main control part of the mobile communication terminal; Including; The built-in flash module and the built-in camera module components of the mobile communication terminal having a high brightness embedded flash module is formed as a module on one circuit board, and connected to the main control unit of the mobile communication terminal through one connector. The method of claim 5, The flash lens has an inner surface flat toward the tube lamp side, a bar surface convex toward the subject side, and has a constant thickness in a direction parallel to the central axis direction of the tube lamp. Mobile communication terminal having a high brightness embedded flash module. The method of claim 6, The outer surface of the flash lens has a high radius of curvature of the central portion close to the center axis of the tube lamp, the mobile communication having a high brightness embedded flash module characterized in that the radius of curvature of both ends far from the center axis of the tube lamp is smaller. terminal. The method of claim 5, The tube lamp is a mobile communication terminal having a high brightness built-in flash module, characterized in that the xenon lamp.