WO2009096677A1

WO2009096677A1 - Camera module with portable platform

Info

Publication number: WO2009096677A1
Application number: PCT/KR2009/000313
Authority: WO
Inventors: Sang Il Jung; Sang Woo Lee
Original assignee: Kraze Vina Inc.
Priority date: 2008-01-29
Filing date: 2009-01-21
Publication date: 2009-08-06

Abstract

The present invention relates to a camera module which provides viewing, photography and video communications during day as well as night time conditions by use of an infrared emitting diode (IRED), and a portable platform. The camera module and the portable platform comprise a camera, an IRED member, a controller and a transmitter. The camera is able to photograph a subject using infrared or visible light and converts the image into electric signals. The IRED member is installed at least 12 mm away from the camera and radiates infrared light with a wavelength of between 830 nm and 880 nm, with direction angle of between 16 and 18 degrees towards the subject. The controller transmits the electric signals from the camera to an external multi-function device, and controls the camera and the IRED member based on the control signals from the multi-function device. The transmitter distributes electric signals among the camera, the IRED member and the controller.

Description

Camera module and portable terminal having same

The present invention relates to a camera module and a portable terminal having the same, and more particularly, to an infrared light emitting diode (InfraRed Emitting Diode: IRED) that emits infrared light having a wavelength range of 830 nm to 880 nm. Of course, the present invention relates to a camera photographing module capable of making a video call at night and a portable terminal for video calling having the same.

In recent years, with the rapid development of semiconductor technology, as electronic devices become more compact, complex electronic devices, in which existing independent devices are integrated into one electronic device, have appeared. Representative composite electronic devices include mobile phones having a camera module in which a mobile phone and a camera are combined.

In other words, the initial mobile phone was designed to make only a voice call, but as the popularity of mobile phones has increased rapidly, the manufacturing technology and communication technology of mobile phones have dramatically developed. As a result, mobile phones support multiple chord ringtones or color displays, and various functions such as playing games, searching the Internet, receiving and sending e-mails, and paying bills are becoming common. In addition, a so-called camera phone that has an optical camera attached to a mobile phone has been developed to take a picture of a subject and wirelessly transmit and receive a captured image. It is gone. In particular, recently, a video call phone capable of making a video call using a camera between two or more parties has been developed and used.

The camera included in the mobile phone is substantially composed of a CMOS Image Sensor (CIS) camera module composed of an image pickup device coupled with a lens module. The camera module includes a condenser lens, an infrared filter, an image sensor, and a barrel or a housing. . The condenser lens collects light incident from a subject on an image sensor, and the infrared filter is provided on an upper surface of the condenser lens to block infrared components included in the incident light. The image sensor includes a CMOS or CCD image sensor, and an image of the subject is formed by the condenser lens. The housing aligns the condenser lens, infrared filter and image sensor on the same optical axis.

As a communication device (hereinafter, referred to as a composite device) having a complex function has emerged, the user is interested in not only the function of the composite device but also the portability. That is, the user wants a multi-use device that is convenient to use, portable, and excellent in performance. In order to meet the needs of users, efforts and developments to improve performance while reducing the volume through the compactness of all the components constituting the multi-component device continue.

As one of them, the camera uses infrared rays to photograph at night as well as during the day. In this way, the infrared imaging is installed in a number of underground parking lots or public places at night, which do not need to brighten the lights, and is frequently used for crime prevention such as security, theft prevention, or parking violation control.

However, the CIS camera used in the composite device has a disadvantage in that shooting is free in bright lighting but difficult to shoot in a place without lighting or at night.

In particular, imaging equipment using a CMOS or CCD image sensor is equipped with an infrared cut filter in the camera module so that infrared light is not focused on the light incident from the image sensor, and even if a small amount of infrared light is collected, the infrared light is collected. Infrared imaging is impossible because it does not have an infrared detector that detects and converts it into an electrical signal.

In particular, in the case of a mobile phone capable of a video call, the image quality of the captured image is very poor when the surrounding environment is dark, or the image quality of the mobile phone can be hardly recognized at all. Due to these limitations, a problem arises in that it cannot be applied to a mobile phone providing a free call regardless of a place that can be said to be the biggest advantage of the mobile phone. Accordingly, there is a problem that results in a great inconvenience for the user who wants to make a video call freely without restriction in place.

The present invention has been made in view of the above problems, and an object of the present invention is to enable a video call by applying an infrared light emitting diode (InfraRed Emitting Diode: IRED) to emit infrared light having a wavelength range of 830 nm to 880 nm. It is to provide a camera module.

Another object of the present invention is to provide a portable terminal including the camera module.

In order to achieve the above object of the present invention, the camera module includes a camera unit, an infrared light emitting diode (IRED) unit, a controller, and a transmitter. The camera unit photographs a subject based on the input infrared or visible light and converts the subject into an electrical signal. The infrared light emitting diode (IRED) part is formed to be spaced apart from the camera part by 12 mm or more to remove white eye phenomenon that occurs during the video call function, and has a wavelength band of 830 nm to 880 nm and 16 degrees to the subject. It emits infrared light with a direction angle [theta] of 28 degrees. The controller transmits an electrical signal output from the camera unit to an external composite device, and controls the camera unit and the infrared light emitting diode unit according to a control signal input from the composite device. The transmitter transmits and receives an electrical signal between the camera unit, the infrared light emitting diode unit, and the controller.

In embodiments of the present invention, the camera unit includes a condenser lens, an image sensor, and a housing. The condenser lens focuses light incident from the subject. The image sensor forms an image of the subject by the condensing lens. In addition, the image sensor converts infrared light among the light incident through the condensing lens into an electrical signal. The housing aligns the condenser lens and the image sensor on the same optical axis.

In embodiments of the present invention, the infrared light emitting diode unit may be formed to be spaced apart from the camera unit by 12 mm to 36 mm.

In embodiments of the present invention, the transmission unit may be composed of a flexible printed circuit board (FPCB).

In order to achieve the above object of the present invention, the portable terminal according to the embodiments of the present invention is integrated with a camera module having the above-described features and devices having different functions.

The camera module and the portable terminal having the same according to the present invention as described above has the following effects.

First, the CIS camera used in the composite device includes an image sensor for detecting an infrared light component of incident light, so that a subject can be photographed at a place with bright lighting as well as at a place without lighting or at night.

Second, the infrared light emitting diode unit emits only infrared light having a wavelength band of 830 nm to 880 nm to photograph the subject, thereby reducing power consumption of the portable terminal and improving image quality of the captured image.

Third, since the infrared light emitting diode unit and the camera unit are disposed at a predetermined distance apart from each other, the white light phenomenon generated in the captured image may be removed to achieve more clear image quality at night.

1 is a view for explaining a camera module according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating the structure of the camera unit illustrated in FIG. 1 in detail.

3 is a view for explaining the principle of image acquisition of the camera module according to an embodiment of the present invention.

4 is a graph showing the sensor sensitivity of the image sensor according to the wavelength of infrared light.

FIG. 5 is a photograph of an actual photograph of a subject according to a separation distance between the camera unit and the infrared light emitting diode unit of FIG. 1.

6 is a table for describing pupil brightness of subjects according to the separation distance of FIG. 5.

FIG. 7 is a graph for describing the separation distance and pupil brightness of FIG. 6.

FIG. 8 is a photograph of an actual photograph of a subject according to a direction angle of infrared light emitted from the infrared light emitting diode unit of FIG. 1.

FIG. 9 is a table for describing brightness of pictures according to the orientation angle of FIG. 8.

FIG. 10 is a graph for describing the directivity angle of FIG. 9 and the brightness of photographs. FIG.

FIG. 11 is a diagram illustrating a case where a subject is photographed at night without lighting by using a conventional portable terminal and a portable terminal according to the present invention.

With reference to the accompanying drawings will be described in detail a surveillance camera device according to embodiments of the present invention. As the inventive concept allows for various changes and numerous modifications, particular embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed form, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In describing the drawings, similar reference numerals are used for similar elements. In the accompanying drawings, the dimensions of the structure is shown to be larger than the actual size for clarity of the invention, or to reduce the actual size to understand the schematic configuration.

In addition, terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. On the other hand, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

1 is a view for explaining a camera module according to an embodiment of the present invention, Figure 2 is a block diagram for explaining in detail the structure of the camera shown in FIG.

1 and 2, a camera module according to an exemplary embodiment of the present invention includes a camera unit 100, an infrared light emitting diode (IRED) unit 200, a transmitter 300, and a controller 400.

The camera unit 100 is mounted in one region on the substrate 150. At this time, the camera unit 100 and the substrate 150 are electrically coupled to each other by the bonding wire 140. Here, the substrate 150 may include a printed circuit board (PCB), a flexible circuit board (FPCB), a ceramic substrate, and the like.

The camera unit 100 photographs a subject based on the input infrared light or visible light and converts the subject into an electric signal. For example, the camera unit 100 converts an image signal from the subject into an electrical signal. Accordingly, the camera unit 100 includes a condenser lens 110, an image sensor 120, and a housing 130.

The condenser lens 110 condenses light for representing an image to the image sensor 120. Here, the image refers to an image incident from the subject. On the other hand, the condenser lens 110 is disposed in front of the camera unit 100 based on the subject to focus the image signal for representing the image of the subject to the image sensor 120. For example, the condenser lens 110 may be a convex lens.

The image sensor 120 is disposed in a region where an image image of a subject collected by the condenser lens 110 is formed. That is, the image sensor 120 is disposed at the rear end of the condenser lens 110 based on the subject, and the light collected from the condenser lens 110 is formed on the image sensor 120.

In an embodiment of the present invention, when the camera module is a CIS camera module, the condenser lens 110 and the image sensor 120 are spaced apart from each other by a predetermined distance. The spaced distance may be adjusted to correspond to the focal length of the condenser lens 110. For example, the distance between the condenser lens 110 and the image sensor 120 may be adjusted to correspond to the infrared light shooting at night and the visible light shooting at the daytime shooting, respectively. Accordingly, by controlling the focal length according to the infrared light and the visible light, it is possible to implement a clearer picture quality. Here, the separation distance may be controlled through a switch (not shown) separately disposed outside. For example, in order to precisely adjust the separation distance between the condenser lens 110 and the image sensor 120, a servo motor or the like may be used. On the other hand, clear image quality can also be achieved through software image quality correction rather than mechanical distance control.

The image sensor 120 senses visible light and infrared light having a specific wavelength band. For example, the image sensor 120 may include a charge coupled device (CCD) image sensor, a complementary metal oxide image sensor, or the like. When the image sensor 120 is a CD image sensor, the image sensor 120 may sense an image of the subject by flowing a current corresponding to the focused light.

In embodiments of the present invention, the image sensor 120 converts infrared light among incident light into an electrical signal.

The housing 130 or the barrel is disposed to protect the condenser lens 110 and the image sensor 120 from external shocks. In addition, the housing 130 integrates the condenser lens 110 and the image sensor 120 into an integrated camera unit 100 spaced apart by a predetermined interval. In an embodiment of the invention, the housing 130 aligns the condenser lens 110 and the image sensor 120 on the same optical axis. That is, the housing 130 arranges the condenser lens 110 and the image sensor 120 such that the subject, the condenser lens 110 and the image sensor 120 are aligned on the same optical axis.

The infrared light emitting diode unit 200 is spaced apart from the camera unit 100 by a predetermined distance and mounted in a region on the substrate 150. That is, the camera unit 100 and the infrared light emitting diode unit 200 are spaced apart from each other on one region of the substrate 150. In the exemplary embodiment of the present invention, the infrared light emitting diode unit 200 is disposed to be spaced apart from the camera unit 100 by 12 mm or more. In detail, the infrared light emitting diode unit 200 is disposed to be spaced apart from the camera unit 100 by 12 mm to 36 mm. A description of the separation distance between the infrared light emitting diode unit 200 and the camera unit 100 will be described in detail with reference to FIG. 3.

The infrared light emitting diode unit 200 emits infrared light toward the subject. In the embodiment of the present invention, the infrared light emitting diode unit 200 emits infrared light having a wavelength band of 830nm to 880nm. In addition, the directivity angle θ of the infrared light emitted from the infrared light emitting diode unit 200 may be 16 degrees to 28 degrees. The description of the direction angle θ will be described in detail with reference to FIG. 3 and the like.

The transmitter 300 transmits and receives an electrical signal between the camera unit 100, the infrared light emitting diode unit 200, and the controller 400. For example, the transmitter 300 transmits an electric signal related to the image of the subject sensed by the camera unit 100 to the controller 400. In addition, the transmitter 300 receives a control signal regarding the operation of the camera unit 100 and the infrared light emitting diode unit 200 from the control unit 400 and transmits the control signal to the camera unit 100 and the infrared light emitting diode unit 200. do. For example, the transmitter 300 is composed of a flexible printed circuit board (FPCB). Alternatively, the transmitter 300 may include various means for transmitting and receiving an electrical signal between the camera unit 100, the infrared light emitting diode unit 200, and the controller 400.

The controller 400 transmits an electrical signal output from the camera unit 100 to an external device such as a mobile phone, and controls the camera unit 100 and the infrared light emitting diode unit 200 according to a control signal input from the external device. do. The controller 400 is electrically connected to the camera unit 100 and the infrared light emitting diode unit 200 through the transmitter 300. For example, the controller 400 may include one region of the substrate 150 on which the camera unit 100 and the infrared light emitting diode unit 200 are disposed, and the other region of the adjacent substrate 150 with the transmitter 300 interposed therebetween. Can be placed in.

As described above, the camera module according to the embodiment of the present invention may improve the photographing quality of the subject by adjusting the separation distance between the camera unit 100 and the infrared light emitting diode unit 200.

3 is a view illustrating an image acquisition principle of a camera module according to an embodiment of the present invention, Figure 4 is a graph showing the sensor sensitivity of the image sensor according to the wavelength of the infrared light.

3 and 4, when taking a picture or making a video call at night using a camera module of a composite device such as a mobile phone, the infrared light emitting diode unit 200 emits infrared light of a predetermined wavelength to a subject, and the camera unit The sensor 100 senses the infrared light reflected from the subject, converts the infrared light into an electric signal, and transmits it to an external composite device. In this way, the camera module can capture an image of the subject.

On the other hand, the camera module provided in the conventional camera phone, the conventional video call phone, etc., the optical axis of the camera unit 100 and the light axis of the infrared light emitting diode unit 200 is almost parallel. That is, the camera unit 100 and the infrared light emitting diode unit 200 are disposed adjacent to each other.

At this time, when the camera unit 100 and the infrared light emitting diode unit 200 are disposed to be adjacent to each other, a white-eye phenomenon or a red-eye phenomenon in which the pupils appear red are generated. In particular, the white neck phenomenon occurs more frequently in accordance with the miniaturization of a mobile phone, the simplification of the design, and the like.

Accordingly, in order to prevent the white neck phenomenon, the camera unit 100 and the infrared light emitting diode unit 200 need to be spaced apart by a predetermined distance or more.

In an embodiment of the present invention, the camera unit 100 and the infrared light emitting diode unit 200 are arranged to be spaced apart from each other by 12 mm or more. Specifically, the camera unit 100 and the infrared light emitting diode unit 200 are spaced apart from each other by 12 mm to 36 mm. As such, by arranging the camera unit 100 and the infrared light emitting diode unit 200 so as to be spaced apart by 12 mm or more, deterioration in photographing quality such as white-eye phenomenon and red-eye phenomenon is prevented.

On the other hand, since experimental data and photographing pictures for explaining the prevention of white neck phenomenon according to the separation distance between the camera unit 100 and the infrared light emitting diode unit 200 are shown in detail in FIGS. 5 to 11, FIGS. This will be described in detail with reference to 11.

In the embodiment of the present invention, the infrared light emitting diode unit 200 emits infrared light having a wavelength band of 830nm to 880nm. Therefore, the image sensor 120 of the camera unit 100 is an area where the image of the subject is sensed, and senses only infrared light having a wavelength band of 830 nm to 880 nm emitted from the infrared light emitting diode unit 200.

On the other hand, when the wavelength input to the image sensor 120 is large, the sensing sensitivity of the image sensor 120 is sharply lowered. That is, when the wavelength is 900nm or more, the sensing sensitivity of the image sensor 120 is significantly lowered. In addition, when the wavelength input to the image sensor 120 is small, the power consumption consumed by the infrared light emitting diode unit 200 or the like significantly increases. Therefore, in the exemplary embodiment of the present invention, the infrared light emitting diode unit 200 emits only infrared light having a wavelength band of 830 nm to 880 nm so that the image sensor 120 senses only the wavelength band of 830 nm to 880 nm. Radiate. Therefore, the wavelength range of the infrared light component sensed by the image sensor 120 is limited to 830 nm to 880 nm, so that the camera unit 100 including the image sensor 120 can clearly display both the infrared light and the visible light. While minimizing power consumption.

However, even when the infrared light emitting diode unit 200 uses infrared light in the wavelength range of 830 nm to 880 nm, it may be difficult to capture a clear image at a distance of the focal length between the infrared light and the visible light during the long distance shooting. However, since the camera module implemented in a composite device such as a mobile phone is mainly used for short-range photography instead of long-range photography, the deterioration of image quality due to the separation of the focal length will hardly occur. In addition, since night viewing and night photographing are possible, the present invention can be applied to a technique used for near field photographing in a portable terminal such as a video call.

In addition, the directivity angle θ of the infrared light emitted from the infrared light emitting diode unit 200 may be 16 degrees to 28 degrees. Here, the direction angle θ refers to the angle range of the entire infrared light emitted from the infrared light emitting diode unit 200 on the basis of the line extending from the optical axis of the infrared light emitting diode unit 200. Accordingly, when the intensity of the infrared light emitted from the infrared light emitting diode unit 200 is constant, the light density of the infrared light emitted may vary according to the size of the directivity angle θ. Therefore, when the direction angle [theta] is small, the intensity of infrared light reaching the specific part of the subject becomes high, and when the direction angle [theta] is large, the intensity of the infrared light which reaches the particular part of the subject becomes small. That is, when the orientation angle θ is small, the center portion of the subject is bright while the peripheral portion may be dark. On the contrary, when the orientation angle θ is large, both the central portion and the peripheral portion of the subject may become dark. Therefore, the infrared light emitting diode unit 200 emits infrared light having a directivity angle of 16 degrees to 28 degrees, thereby realizing the brightness of the subject and the surrounding object as the optimum conditions.

As such, by specifying the wavelength band and the directivity angle θ of the infrared light emitted from the infrared light emitting diode unit 200, and maintaining the separation distance between the infrared light emitting diode unit 200 and the camera unit 100 by 12 mm or more, It can effectively eliminate white spots that occur during shooting or video calls.

FIG. 5 is a photograph of an actual photograph of a subject according to a separation distance between the camera unit and the infrared light emitting diode unit of FIG. 1, and FIG. 6 is a table for describing pupil brightness of the subjects of the photographs according to the separation distance of FIG. 5. FIG. 7 is a graph for describing the separation distance and pupil brightness of FIG. 6.

5 to 7, the separation distance between the camera unit 100 and the infrared light emitting diode unit 200, the directivity angle of the infrared light emitted by the infrared light emitting diode unit 200, and the brightness of the surrounding environment to photograph the subject. The photographing quality of the subject was tested according to the illuminance indicating.

In this experiment, the distance between the camera unit 100 and the infrared light emitting diode unit 200 was set to 8 mm, 10 mm, 12 mm, 20 mm, 28 mm as measured values, and the infrared light emitting diode unit 200 emits the light. The directivity angle of infrared light is set to 20 degrees. In addition, to express photographing a subject in a night or dark environment, illuminance was set to 0, 5, 10 lux (lux) as the measured value. On the other hand, since 0 to 10㏓ all represent the brightness of a dark environment or an environment photographed at night, the experimental data values for illuminance are substantially no difference. Therefore, the detailed description of the results according to the roughness of the experimental data will be omitted.

In this experiment, in order to determine the occurrence of the white-eye phenomenon, which is a phenomenon in which the subject's eyes appear white, the brightness of black representing the eye color is defined as 7.5 IRE (Institute of Radio Engineers). This is cited by the Institute of Electrical and Electronics Engineers (IEEE), which defines the black level of brightness (luminance) as 7.5 IRE. In this case, the IRE expresses the brightness of a video signal as a percentage of the highest brightness to represent a relationship between video electrical output, brightness, and density by the IEEE. In other words, the IRE unit is a unit representing the amplitude of the TV signal determined by the IRE, and the electric signal 1.0 V corresponds to 140 IRE. That is, it corresponds to 1 IRE = 7.14 kHz. Accordingly, white in the video signal refers to 100 IRE, and black refers to 0 IRE. Here, 0 IRE means a level without the video signal itself (ie, Pedestal Level), so the brightness (luminance) of the actual black level is 7.5 IRE. Therefore, in this experiment, in order to express the brightness of black corresponding to the eye color of the subject, the eye brightness of the photographed subject should be defined as 7.5 IRE or less.

Looking at the occurrence of the white neck phenomenon according to the separation distance between the camera unit 100 and the infrared light emitting diode unit 200 with reference to Figure 5, the separation distance between the camera unit 100 and the infrared light emitting diode unit 200 is 10 In the case of mm or less, it can be seen that the white neck phenomenon occurs in the pictures of the subject. On the contrary, when the separation distance between the camera unit 100 and the infrared light emitting diode unit 200 is 12 mm or more, it can be seen that the white neck phenomenon does not occur. Therefore, according to the experimental data, it can be said that there is a critical significance before and after the separation distance between the camera unit 100 and the infrared light emitting diode unit 200 is 12mm. Of course, the same result can be obtained when the photographs of the subjects are visually observed.

Referring to FIGS. 6 and 7, the eye brightness of the subject was measured to examine the occurrence of white eye phenomenon in the photographed picture according to the separation distance between the camera unit 100 and the infrared light emitting diode unit 200. As mentioned above, when the pupil brightness of the subject is 7.5 IRE or less, it can be seen that black is expressed. Thus, when the separation distance between the camera unit 100 and the infrared light emitting diode unit 200 is 10 mm, it can be seen that the pupil brightness of the subject is 26, 28, 32 IRE. In addition, even when the separation distance between the camera unit 100 and the infrared light emitting diode unit 200 is 11 mm, it can be seen that the pupil brightness of the subject is 10 IRE or more. On the contrary, when the separation distance between the camera unit 100 and the infrared light emitting diode unit 200 is 12 mm, it can be seen that they are 7.2, 6.8, and 5.6 IRE. That is, when the separation distance is 12mm, it can be seen that the pupil brightness of the subject expresses black defined by the IEEE. Furthermore, when the separation distance between the camera unit 100 and the infrared light emitting diode unit 200 is 12 mm or more, it can be seen that the pupil brightness of the subject expresses black more clearly. Therefore, according to the experimental data, it can be said that the distance between the camera unit 100 and the infrared light emitting diode unit 200 is 12 mm before and after the critical significance. Furthermore, when the separation distance between the camera unit 100 and the infrared light emitting diode unit 200 is 12 mm or more, not only the brightness of the eyes of the subject but also the brightness of the subject and the surrounding environment, In contrast, the separation distance with a change in brightness within 15% corresponds to 36 mm. Therefore, when the separation distance between the camera unit 100 and the infrared light emitting diode unit 200 is 12 mm to 36 mm, the white eye phenomenon may be removed and the shooting quality may be maintained.

As such, when the separation distance between the camera unit 100 and the infrared light emitting diode unit 200 is 12 mm or more, the white neck phenomenon may be removed from the photographed subject.

FIG. 8 is a photograph of an actual photograph of a subject according to a directivity angle of infrared light emitted from the infrared light emitting diode unit of FIG. 1, FIG. 9 is a table for describing brightness of photographs according to the directivity angle of FIG. 8, and FIG. 10. 9 is a graph for explaining the orientation angle of FIG. 9 and the brightness of photographs.

8 to 10, in the embodiment of the present invention, the photographing quality of the subject according to the center brightness and the ambient brightness of the pictures taken according to the directivity of the infrared light emitted by the infrared light emitting diode unit 200. Was tested.

In the present experiment, since the infrared light emitting diode unit 200 emits infrared light having a wavelength band of 830 nm to 880 nm, in this experiment, 850 nm is set as a reference value, and the camera unit 100 and the infrared light emitting diode unit ( The separation distance of 200) was set to 12 mm as a reference value. The reason is that the smaller the separation distance, the higher the sensing sensitivity of the brightness of the photographed picture, and 12mm, the minimum separation distance of 12mm to 36mm according to an embodiment of the present invention is set as a reference value Experiment. And the directivity angle of infrared light set 4, 11.5, 16, 20, 28, 35 degree | times as a measured value.

In this experiment, the center brightness is defined as 50 IRE or more and the ambient brightness is defined as 25 IRE or more. This is based on the definition of the appropriate brightness of 50 IRE or more, based on the maximum brightness of 100 IRE, based on the analog video signal low light sensitivity characteristic of the IEEE. In addition, the peripheral brightness is defined as 25 IRE or more because the subject can be expressed only when it is 25 IRE or more, which is half of the central brightness of the subject 50 IRE.

Referring to FIG. 8 and FIG. 9, the center brightness and the ambient brightness of the photographed photograph at the directivity angle of the infrared light are shown. When the directivity angles are 4 degrees and 11.5 degrees, the center brightness is measured at 100 IRE and 96 IRE, and the ambient brightness is It was measured from 7 IRE to 11 IRE. Therefore, when the directivity angles are 4 degrees and 11.5 degrees, it is possible to confirm that the photographing of the subject has degraded the photographing quality such that the central saturation of brightness occurs, making it difficult to identify the subject. In addition, when the orientation angle was 35 degrees, the central brightness was measured at 16 IRE and the ambient brightness was measured at 6 IRE to 10 IRE. Therefore, when the orientation angle is 35 degrees, it can be confirmed that the photographing of the subject is dark so that the photographing quality is deteriorated so that it is difficult to identify the subject. In contrast, when the orientation angle was 16 degrees to 28 degrees, the central brightness was measured at 56 IRE to 69 IRE and the ambient brightness was measured at 25 IRE to 30 IRE. Therefore, when the orientation angle is 16 degrees to 28 degrees, not only the central saturation phenomenon but also the overall dark phenomenon does not occur and it is confirmed that the photographing quality is excellent. Of course, the same result can be obtained when the photographs of the subjects are visually observed.

Referring to FIG. 10, when the central saturation phenomenon occurs according to the directivity angle of infrared light, when the directivity angle is 16 degrees to 28 degrees, the center brightness of the subject was measured to be 56 IRE to 69 IRE. Therefore, when the orientation angle is 16 degrees to 28 degrees, it can be seen that the central saturation phenomenon does not occur in the subject.

Therefore, it can be said that there is a critical significance before and after the case where the directivity angle of the infrared light emitted by the infrared light emitting diode unit 200 is 16 degrees to 28 degrees.

As such, when the directivity angle of the infrared light from the infrared light emitting diode unit 200 is 16 degrees to 28 degrees, the center brightness and the peripheral brightness of the photographed subject may be represented efficiently.

FIG. 11 is a diagram illustrating a case where a subject is photographed at night without lighting by using a conventional portable terminal and a portable terminal according to the present invention. That is, FIG. 11 is a diagram for comparing an image photographed at night using a portable terminal 600 having a camera module according to an embodiment of the present invention and an image photographed at night using an existing portable terminal 500. to be.

Referring to FIG. 11, in the case where there is little illumination or at night, the image captured by the conventional portable terminal 500 may be degraded to such an extent that the subject can hardly be identified. On the contrary, in the case where there is little illumination or at night, the image photographed by the mobile terminal 600 having the camera module according to the embodiment of the present invention exhibits an image quality that can accurately identify the shape of the subject. It can be seen that. Therefore, when there is little light or at night, when photographing a subject using the portable terminal 600 provided with the camera module according to an embodiment of the present invention, the result of photographs, images, etc. of which the photographing quality is significantly improved is obtained. You can get it.

Although the detailed description of the present invention has been described with reference to the preferred embodiments of the present invention, those skilled in the art or those skilled in the art will have the idea of the present invention described in the claims to be described later. It will be understood that various modifications and variations can be made in the present invention without departing from the scope of the present invention.

According to such a camera module and a portable terminal having the same, the CIS camera used in the composite device detects the infrared light component included in the incident light so that the subject can be photographed in a place where there is no bright light or a place where there is no light or at night. In addition, the infrared light emitting diode unit emits only infrared light having a wavelength band of 830 nm to 880 nm to photograph the subject, thereby reducing power consumption of the portable terminal and improving image quality of the captured image. Furthermore, since the infrared light emitting diode unit and the camera unit are disposed 12 mm or more apart, the white light phenomenon generated in the captured image may be removed to realize more clear image quality at night.

Claims

In the camera module provided in the portable terminal for performing a video call function,

A camera unit for photographing a subject located at a short distance based on the input infrared light or visible light and converting the same into an electric signal;

It is formed to be spaced apart from the camera unit by 12mm or more to remove the white neck phenomenon that occurs during the video call function, the wavelength band of 830nm to 880nm and the directivity angle of 16 degrees to 28 degrees toward the subject. Infrared light emitting diode (IRED) unit for emitting infrared light having a;

A control unit which transmits an electrical signal output from the camera unit to an external composite device and controls the camera unit and the infrared light emitting diode unit according to a control signal input from the composite device; And

And a transmitter configured to transmit and receive an electrical signal between the camera unit and the infrared light emitting diode unit and the controller.
The method of claim 1, wherein the camera unit

A condenser lens for condensing light incident from the subject;

An image sensor in which an image of the subject is formed by the condenser lens, and converts infrared light among electric light incident through the condenser lens into an electric signal; And

And a housing for aligning the condenser lens and the image sensor on the same optical axis.
The method of claim 1,

The infrared light emitting diode unit is a camera module, characterized in that formed to be spaced apart from the camera by 12mm to 36mm.
The method of claim 1,

The transmission module camera module, characterized in that consisting of a flexible printed circuit board (FPCB).
Portable terminal, characterized in that integrated with the camera module having any one of claims 1 to 4.