KR20060085478A - Device for flash of camera module - Google Patents

Abstract

An object of the present invention is to provide a light emitting device of the camera module that can simplify the installation process and work by packaging the main flash and the auxiliary flash used as the light emitting device of the camera module into one.

Accordingly, the present invention provides at least one main light emitting diode (LED) mounted on a substrate, at least one secondary emitting LED mounted on the substrate and driven when a current is applied in a different direction than the main LED. It provides a light emitting device of the camera module comprising a lens for collecting the light emitted from the LED.

Board, Housing, Primary LED, Secondary LED, Lens

Description

Light emitting device of camera module {Device for flash of camera module}

1 is a schematic perspective view showing a state in which a light emitting device of a camera module according to an embodiment of the present invention is installed in a portable terminal.

2 is a perspective view illustrating a light emitting device of a camera module according to an exemplary embodiment of the present invention.

3 is a circuit diagram of a light emitting device of a camera module according to an exemplary embodiment of the present invention.

4 is a circuit diagram of a light emitting device according to another embodiment of the present invention.

4A and 4B are circuit diagrams illustrating a light emitting device circuit operating state of a camera module according to an exemplary embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10 light emitting device 11 substrate

12: main LED 13: auxiliary LED

14 housing 15 lens

The present invention relates to a camera module. More particularly, the present invention relates to a light emitting device of a camera module for emitting light to a subject.

Recently, digital cameras for capturing an image of a subject using a CCD or MOS solid-state imaging device and recording corresponding image data on a recording medium such as a flash memory have been widely used. As a medium for the development of a mobile terminal such as a mobile phone or PDA with a camera has been developed and spread.

For example, a camera mounted on a portable terminal is in accordance with general camera principles, and includes an image pickup device module having an image sensor that receives light from an external light source and recognizes the image as an image.

In addition, in order to satisfy various needs of consumers, for example, the macro function of the lens that can change the lens focus manually and take a short distance or the digital zoom function that can enlarge a specific part of the image are becoming important functions.

In addition, the flash function that allows shooting even in the dark or at night is already common in analog and digital cameras. In the case of a portable terminal with a camera, it is essential to install a light emitting device for this purpose. to be.

Therefore, a portable terminal capable of transmitting information such as a video by performing a camera function in addition to the original communication function has a light emitting device as a photographing element module for recognizing an image and means for emitting light to a subject so that a subject can be photographed at night. Is fitted.

In the case of a portable terminal including a PDA or a mobile phone, a conventional light emitting device provides only a main flash function for image recognition, and a light emitting device for a camera such as a digital camera lacks light with a main flash for image recognition. To help the camera focus quickly and accurately, the camera is equipped with an auxiliary flash to emit light to the subject, or to provide secondary strobe light for red-eye reduction.

If you use an auxiliary flash, it will be faster and more accurate than the camera module, and will be more effective when shooting close-ups or in dark places.

However, in the prior art, the light emitting device of the camera module has a problem in that the manufacturing cost increases due to the complicated structure of the equipment and the mounting process of each component as the main flash and the sub flash are mounted as separate elements. .

The present invention has been made to solve the above problems, an object of the present invention is to package the main flash and the auxiliary flash used as the light emitting device of the camera module in one package of the camera module to simplify the installation process and operation It is to provide a light emitting device.

In addition, the present invention provides a light emitting device of a camera module that can reduce the number of parts used by integrating the main flash and the auxiliary flash for imaging and to solve the spatial constraints caused when the main flash and the auxiliary flash is dually provided. There is another purpose in providing.

In order to achieve the above object, the present invention provides a light emitting device of a camera module, comprising: a main light emitting diode (LED) mounted on a substrate to emit photographing light, an auxiliary light emitting LED mounted on the substrate to generate auxiliary light; It includes a lens for collecting the light emitted from each of the LEDs.

As such, the main LED and the auxiliary LED are mounted together on one substrate and packaged, thereby miniaturization.

Each of the light emitting LEDs may be formed in a surface mount form or a dip form.

In addition, the main light emitting LED is preferably a white LED so as to obtain the main light amount for shooting, and the auxiliary light emitting LED has a light amount more than a red LED or an orange LED or an infrared LED or an infrared LED or a main light emitting LED for improving autofocus or securing an auxiliary light amount or red-eye reduction. This may be a low white LED and is not particularly limited.

In addition, the main light emitting LED may be composed of a plurality of LEDs or a single LED having a large amount of light.

The auxiliary light emitting LED may also consist of a plurality of LEDs or a single LED having a large amount of light.

Here, the arrangement structure between the main light emitting LED and the auxiliary light emitting LED mounted on one substrate is not particularly limited.

The light emitting device of the present invention including the main light emitting LED and the auxiliary light emitting LED may be for a camera module installed in the camera.

In addition, the light emitting device may be for a camera module installed in a portable terminal including a PDA or a mobile phone.

Meanwhile, in the circuit configuration of the main light emitting LED and the auxiliary light emitting LED, the main light emitting LED and the auxiliary light emitting LED are each configured by separate circuits to be driven individually according to respective driving signals, or the main light emitting LED. And the auxiliary light emitting LED may have a structure in which the main light emitting LED and the auxiliary light emitting LED are selectively driven according to the direction of the current applied to the circuit so that the current flows for driving are opposite to each other.

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

In the following description, a camera module installed in a portable terminal is described as an example, but the present invention is not necessarily limited thereto.

1 is a schematic perspective view showing a state in which a light emitting device of a camera module according to an embodiment of the present invention is installed in a portable terminal, Figure 2 is a perspective view showing a light emitting device of a camera module according to an embodiment of the present invention, 3 is a circuit diagram of a light emitting device of a camera module according to an exemplary embodiment of the present invention.

According to the above drawings, the light emitting device 10 according to the present embodiment is installed on the back of the portable terminal 100 together with the camera.

The light emitting device 10 has a structure in which the main light emitting LED 12 and the auxiliary light emitting LED 13 are mounted together on a substrate 11 in a package.

That is, the light emitting device 10 according to the present exemplary embodiment includes a housing 14 installed in the terminal 100 and a main light emitting LED 12 mounted on a substrate 11 installed in the housing 14. And an auxiliary light emitting LED 13 mounted on the substrate 11 and driven when a current is applied in a direction different from that of the main light emitting LED 12, and installed outside the housing 14 to emit light from each of the LEDs. It has a structure packaged in one housing 14 including a lens 15 for collecting the.

The light emitting diode (LED) is defined as meaning a diode that emits excess energy as light when electrons or holes injected using the p-n junction structure of the semiconductor are recombined.

According to the present embodiment, both the main light emitting LED 12 and the auxiliary light emitting LED 13 constituting the light emitting device 10 are mounted on one substrate 11, so that a sufficient amount of light for photographing can be obtained. Four LEDs 12 are provided in total, and one auxiliary LED 13 is provided.

Of course, the number of the main LED 12 or the auxiliary LED 13 may be changed according to the distance between the subject and the LED, the degree of darkness around the subject and the required illuminance, the wavelength of 580nm for the auxiliary LED 13 It is more than ideal.

The main light emitting LED 12 is used to obtain a main light amount when photographing, and a white LED is used, and the auxiliary light emitting LED 13 uses a red LED, an orange LED white, or an infrared LED.

In this embodiment, although LEDs emitting two different kinds of colors are illustrated as being used, a single white LED emitting white light may be used instead of the auxiliary light emitting LED 13 of the color, in which case the light emitting device 10 The driver connected to can adjust only the driving number of the white LED according to the amount of light required.

In addition, the main LED 12 and the auxiliary LED 13 is connected so that the current flow for the operation of the circuit on the substrate 11 is opposite to each other, if the current is applied in any direction on the circuit Only one of the light emitting LEDs 12 and the auxiliary light emitting LEDs 13 is turned on, and the circuit structure of each of the light emitting LEDs will be described later.

On the other hand, the housing 14 is to be the mounting means of the light emitting device 10 for the portable terminal, it may be connected to the camera module or installed separately from the camera module and mounted on the mobile phone terminal, the housing 14 ) Is not particularly limited.

The housing 14 is fixedly installed in the mobile phone terminal, the lens 15 is installed on the front surface, and the substrate 11 on which each light emitting LED is mounted is fixedly installed therein.

The main light emitting LED 12 and the auxiliary light emitting LED 13 are manufactured in a chip shape, respectively, and are bonded to one substrate 11 by die bonding and connected to the substrate 11 through a wire bonding process, followed by molding and cutting. It is manufactured into one device through the process.

The housing 14 configured as described above has an anode lead and an anode lead extending outwardly connected to the substrate 11, and each lead is electrically connected to a motherboard (not shown) of the portable terminal 100. The main light emitting LEDs 12 and the auxiliary light emitting LEDs 13 emit light as necessary in accordance with the direction of the current applied from the driver.

Meanwhile, according to another embodiment of the circuit configuration of the present light emitting device, as shown in FIG. 4, the main light emitting LEDs 12 and the auxiliary light emitting LEDs 13 mounted on the substrate are individually circuitd on the substrate. Has a connected structure.

As such, each LED 12 and 13 is connected to the board through a separate circuit configuration, and the driver of the motherboard applies a signal to the main LED 12 or the auxiliary LED 13, respectively. It can be operated individually or simultaneously.

Hereinafter, a circuit configuration of the main LED 12 and the auxiliary LED 13 and its operation will be described with reference to the embodiment of FIG. 3.

3 is a circuit diagram of a light emitting device of a camera module according to an embodiment of the present invention, Figures 5a and 5b is a circuit diagram showing a light emitting device circuit operating state of a camera module according to an embodiment of the present invention.

According to the above drawings, four main light emitting LEDs 12 are arranged in parallel on the circuit and are connected in one direction, and one auxiliary light emitting LED 13 is different from the main light emitting LED 12 on the circuit. It is connected structure by parallel structure.

Accordingly, when a voltage is applied in one direction, for example, as shown in FIG. 5A, no current flows through the auxiliary light emitting LEDs 13 and thus no light is emitted, and current flows through the four main light emitting LEDs 12. ) Will emit light.

On the contrary, when the reverse voltage is applied to the circuit as shown in FIG. 5B, the current does not flow to the four main light emitting LEDs 12 and only current flows to the auxiliary light emitting LEDs 13 and only the auxiliary light emitting LEDs 13 are applied. It is driven to emit light.

The circuit driving directions of the main LED 12 and the auxiliary LED 13 are not particularly limited except that they must be driven when voltages are applied in opposite directions.

Hereinafter, the operation of the present invention will be described.

In this embodiment, each of the LEDs is set to provide their respective predetermined brightness upon light emission to provide the appropriate main shooting light and auxiliary light to the camera installed in the portable terminal.

For example, when the autofocus operation is applied, the camera of the camera module opens the shutter to acquire an image, and the obtained image is displayed through an LCD provided in the portable terminal. During this operation, the controller installed in the motherboard in the portable terminal drives the auxiliary light emitting LED 13 to perform preliminary emission of light in order to perform contrast autofocus control.

That is, as shown in FIG. 5B, when the driving voltage is applied to the substrate 11 of the light emitting device 10 in the reverse direction through the motherboard, the four main light emitting LEDs 12 are not driven but only the auxiliary light emitting LEDs 13. ) Is driven to emit light, and the light emitted from the auxiliary light emitting LED 13 is irradiated to the outside through the lens 15 installed in the housing 14.

In this state, image acquisition by the CCD is temporarily stopped, and when the user presses the shutter completely after autofocusing is performed, the controller switches the voltage applied in the reverse direction to the forward direction so that the substrate 11 of the light emitting device 10 can be moved. Forward voltage is applied to the phase.

Accordingly, as shown in FIG. 5A, as the forward current flows on the circuit, the auxiliary light emitting LED 13 is stopped and only the main light emitting LED 12 is driven to emit light, and the light emitted from the main light emitting LED 12 is Like the auxiliary light-emitting LED 13, it is irradiated to the outside through the lens 15 of the same housing 14.

Accordingly, it is possible to obtain a light amount of brightness required for shooting.

On the other hand, in the red-eye prevention operation as described above, before the main LED 12 emits light, a reverse voltage is applied to the substrate 11 according to a signal of the controller so that the auxiliary LED 13 emits light. And the light emitted from the auxiliary light emitting LED 13 is irradiated to the subject through the lens 15 installed in the housing 14 to prevent the red-eye phenomenon.

Subsequently, a voltage is applied to the substrate 11 in the forward direction, so that the auxiliary light emitting LEDs 13 are not driven and only the main light emitting LEDs 12 are driven to irradiate the main photographing light to the subject through the same lens 15. Will be.

In this way, the main light emitting LED 12 and the auxiliary light emitting LED 13 are mounted together on one substrate 11 to be packaged as one to obtain the main light amount and the auxiliary light amount for photographing through a single device through simple circuit operation. It becomes possible.

As described above, it can be seen that the present invention provides a significantly innovative light emitting device. While exemplary embodiments of the present invention have been shown and described, various modifications and other embodiments may be made by those skilled in the art. Such modifications and other embodiments will be considered and included in the appended claims without departing from the true spirit and scope of the invention.

As described above, according to the light emitting device according to the present invention, by integrating two elements into one, the device can be easily installed, downsized, and the manufacturing cost can be reduced.

In addition, through the miniaturization of the light emitting device, it is possible to apply various designs such as a portable terminal.

Claims (7)

At least one main light emitting diode (LED) mounted on a substrate to emit photographing light, at least one auxiliary LED mounted on the substrate to generate auxiliary light, and a lens for collecting light emitted from each of the LEDs; Light emitting device of the camera module comprising. The light emitting device of claim 1, wherein the main light emitting diodes (LEDs) and the auxiliary light emitting LEDs are connected in parallel to each other and are driven when current is applied in different directions. The light emitting device of claim 1, wherein the main light emitting diodes and the auxiliary light emitting LEDs are connected to and installed in respective circuit configurations on a substrate. The light emitting device of claim 1, wherein the main light emitting LED is a white LED. The light emitting device of claim 1, wherein the auxiliary light emitting LED is selected from a red LED, an orange LED, an infrared LED, or a white LED having a lower amount of light than the main LED. The light emitting device of claim 1, wherein each of the light emitting LEDs has a surface-mount structure or a dip shape. The light emitting device of claim 1, wherein the light emitting device is for a camera or a portable terminal.

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