Patent Publication Number: US-2022217252-A1

Title: Flash lens of electronic device

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This application is a continuation of International Application No. PCT/KR2021/017060, filed on Nov. 19, 2021, which claims priority to Korean Patent Application No. 10-2021-0001895, filed on Jan. 7, 2021 in the Korean Intellectual Property Office, the disclosures of which are herein incorporated by reference. 
    
    
     TECHNICAL FIELD 
     One or more embodiments of the instant disclosure generally relates to an electronic device, for example, a flash lens of an electronic device. 
     BACKGROUND ART 
     As information and communication technologies have developed, semiconductor technology, and various electronic devices provide various functions have also developed. For example, the various functions may include functions related to voice calls, messages, broadcasts, the wireless Internet, cameras, and/or the reproduction of music. 
     An electronic device having a camera embedded therein is a recent trend, and interest in various methods for taking high-quality pictures at night or when there is insufficient light is also increasing. 
     SUMMARY 
     The electronic device may obtain images using at least one camera included in the electronic device, based on user inputs related to photography. In this case, an LED flash disposed inside the electronic device may be used. The flash may emit light at a specific angle, and the light, reflected from a subject whose image is to be captured, may pass through an optical lens to reach a subject. 
     According to the prior art, the emission angle of effective flash light of the electronic device is 76 degrees, and the flash may not be able to cover the field of view of the cameras. The electronic device may have a standard field of view (fov) of 79 degrees and a wide angle of view (fov) of 120 degrees. 
     In addition, according to the prior art, captured images may exhibit vignetting. Vignetting refers to when the peripheral portion of the image is darker than the central portion thereof. This is due to the fact that the subject is close to the flash, while the peripheral portion is far from the flash. Since the subject is located in the center of the light emitted from the flash, the subject may receive a relatively large amount of light, thereby causing glare. The peripheral portion receiving a relatively small amount of light from the flash may appear to be cave-like. Here, cave-like refers to a phenomenon where the background appears dark. This may be particularly problematic in cameras of mobile devices. 
     Certain embodiments of the disclosure provide a flash lens for preventing glare on a subject and improve the difference in brightness in the peripheral portion by evenly flashing the light emitted from the flash when capturing images in the dark, and a method of manufacturing the same. 
     An electronic device according to an embodiment may include a first camera module, and a flash module disposed adjacent to the first camera module, wherein the flash module may include an LED configured to emit light, and an optical lens disposed in the traveling direction of the light emitted from the LED, wherein the optical lens may include a first surface in the direction facing the LED and a second surface in the direction opposite the first surface, and wherein the second surface of the optical lens may include a first translucent area including a central area where the light emitted from the LED is incident and a second translucent area spaced apart from the first translucent area. 
     According to certain embodiments of the disclosure, an optical lens having different transparencies between the areas thereof may be provided in front of a light-emitting element of the electronic device, thereby providing a similar uniformity of light reaching a nearby subject or a background behind the same. According to this, it is possible to provide a flash lens that prevents glare of a nearby subject and prevents the background from darkening by causing the emitted light to evenly reach the subject when taking a picture. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a block diagram of an electronic device in a network environment according to an embodiment. 
         FIG. 2  is a block diagram  200  illustrating a camera module  180  according to an embodiment. 
         FIG. 3  is a block diagram illustrating operations of elements of an electronic device according to an embodiment of the disclosure. 
         FIG. 4  is a structural diagram of an electronic device according to an embodiment of the disclosure. 
         FIG. 5  illustrates paths and distribution of light when capturing an image using a conventional electronic device. 
         FIG. 6  is a three-dimensional view illustrating a model of an optical lens of an electronic device according to an embodiment of the disclosure. 
         FIG. 7  is a structural diagram of an electronic device according to an embodiment of the disclosure. 
         FIG. 8  is a plan view of an optical lens constituting an electronic device according to an embodiment of the disclosure. 
         FIG. 9  is a plan view of an optical lens constituting an electronic device according to an embodiment of the disclosure. 
         FIG. 10  is a diagram illustrating a process of obtaining a variable K according to an embodiment of the disclosure. 
         FIG. 11  illustrates a process of obtaining a variable K according to an embodiment of the disclosure. 
         FIG. 12  illustrates a process of determining a translucent area in the case where there is a plurality of camera modules according to an embodiment of the disclosure. 
         FIG. 13  is a side view of the structure of an electronic device according to an embodiment of the disclosure. 
         FIG. 14  is a plan view illustrating a conventional optical lens and an optical sensor to which a translucent area is applied according to an embodiment of the disclosure. 
         FIG. 15  illustrates a model of an optical lens of an electronic device according to an embodiment of the disclosure. 
         FIG. 16  is a plan view of an optical lens of an electronic device according to an embodiment of the disclosure. 
         FIG. 17  illustrates a process of determining transparency of a translucent area of an electronic device according to an embodiment of the disclosure. 
         FIG. 18  is a flowchart illustrating the operation of an electronic device according to an embodiment of the disclosure. 
         FIG. 19  is a detailed view illustrating the structure of an optical lens according to an embodiment of the disclosure. 
         FIG. 20  illustrates a camera module and a light emission angle of an LED according to an embodiment of the disclosure. 
         FIG. 21  illustrates a camera module and a light emission angle of an LED according to an embodiment of the disclosure. 
         FIG. 22  illustrates the direction of light passing through a translucent area according to an embodiment of the disclosure. 
         FIG. 23  illustrates a method of implementing a translucent area according to an embodiment of the disclosure. 
         FIG. 24  illustrates an image captured using a conventional electronic device. 
         FIG. 25  illustrates an image captured by applying a translucent area to an electronic device according to an embodiment of the disclosure. 
     
    
    
     DETAILED DESCRIPTION 
       FIG. 1  is a block diagram illustrating an electronic device  101  in a network environment  100  according to various embodiments. Referring to  FIG. 1 , the electronic device  101  in the network environment  100  may communicate with an electronic device  102  via a first network  198  (e.g., a short-range wireless communication network), or an electronic device  104  or a server  108  via a second network  199  (e.g., a long-range wireless communication network). According to an embodiment, the electronic device  101  may communicate with the electronic device  104  via the server  108 . According to an embodiment, the electronic device  101  may include a processor  120 , memory  130 , an input device  150 , a sound output device  155 , a display device  160 , an audio module  170 , a sensor  FIG. 1  is a block diagram illustrating an electronic device  101  in a network environment  100  according to various embodiments. Referring to  FIG. 1 , the electronic device  101  in the network environment  100  may communicate with an electronic device  102  via a first network  198  (e.g., a short-range wireless communication network), or at least one of an electronic device  104  or a server  108  via a second network  199  (e.g., a long-range wireless communication network). According to an embodiment, the electronic device  101  may communicate with the electronic device  104  via the server  108 . According to an embodiment, the electronic device  101  may include a processor  120 , memory  130 , an input module  150 , a sound output module  155 , a display module  160 , an audio module  170 , a sensor module  176 , an interface  177 , a connecting terminal  178 , a haptic module  179 , a camera module  180 , a power management module  188 , a battery  189 , a communication module  190 , a subscriber identification module(SIM)  196 , or an antenna module  197 . In some embodiments, at least one of the components (e.g., the connecting terminal  178 ) may be omitted from the electronic device  101 , or one or more other components may be added in the electronic device  101 . In some embodiments, some of the components (e.g., the sensor module  176 , the camera module  180 , or the antenna module  197 ) may be implemented as a single component (e.g., the display module  160 ). 
     The processor  120  may execute, for example, software (e.g., a program  140 ) to control at least one other component (e.g., a hardware or software component) of the electronic device  101  coupled with the processor  120 , and may perform various data processing or computation. According to one embodiment, as at least part of the data processing or computation, the processor  120  may store a command or data received from another component (e.g., the sensor module  176  or the communication module  190 ) in volatile memory  132 , process the command or the data stored in the volatile memory  132 , and store resulting data in non-volatile memory  134 . According to an embodiment, the processor  120  may include a main processor  121  (e.g., a central processing unit (CPU) or an application processor (AP)), or an auxiliary processor  123  (e.g., a graphics processing unit (GPU), a neural processing unit (NPU), an image signal processor (ISP), a sensor hub processor, or a communication processor (CP)) that is operable independently from, or in conjunction with, the main processor  121 . For example, when the electronic device  101  includes the main processor  121  and the auxiliary processor  123 , the auxiliary processor  123  may be adapted to consume less power than the main processor  121 , or to be specific to a specified function. The auxiliary processor  123  may be implemented as separate from, or as part of the main processor  121 . 
     The auxiliary processor  123  may control at least some of functions or states related to at least one component (e.g., the display module  160 , the sensor module  176 , or the communication module  190 ) among the components of the electronic device  101 , instead of the main processor  121  while the main processor  121  is in an inactive (e.g., sleep) state, or together with the main processor  121  while the main processor  121  is in an active state (e.g., executing an application). According to an embodiment, the auxiliary processor  123  (e.g., an image signal processor or a communication processor) may be implemented as part of another component (e.g., the camera module  180  or the communication module  190 ) functionally related to the auxiliary processor  123 . According to an embodiment, the auxiliary processor  123  (e.g., the neural processing unit) may include a hardware structure specified for artificial intelligence model processing. An artificial intelligence model may be generated by machine learning. Such learning may be performed, e.g., by the electronic device  101  where the artificial intelligence is performed or via a separate server (e.g., the server  108 ). Learning algorithms may include, but are not limited to, e.g., supervised learning, unsupervised learning, semi-supervised learning, or reinforcement learning. The artificial intelligence model may include a plurality of artificial neural network layers. The artificial neural network may be a deep neural network (DNN), a convolutional neural network (CNN), a recurrent neural network (RNN), a restricted boltzmann machine (RBM), a deep belief network (DBN), a bidirectional recurrent deep neural network (BRDNN), deep Q-network or a combination of two or more thereof but is not limited thereto. The artificial intelligence model may, additionally or alternatively, include a software structure other than the hardware structure. 
     The memory  130  may store various data used by at least one component (e.g., the processor  120  or the sensor module  176 ) of the electronic device  101 . The various data may include, for example, software (e.g., the program  140 ) and input data or output data for a command related thereto. The memory  130  may include the volatile memory  132  or the non-volatile memory  134 . 
     The program  140  may be stored in the memory  130  as software, and may include, for example, an operating system (OS)  142 , middleware  144 , or an application  146 . 
     The input module  150  may receive a command or data to be used by another component (e.g., the processor  120 ) of the electronic device  101 , from the outside (e.g., a user) of the electronic device  101 . The input module  150  may include, for example, a microphone, a mouse, a keyboard, a key (e.g., a button), or a digital pen (e.g., a stylus pen). 
     The sound output module  155  may output sound signals to the outside of the electronic device  101 . The sound output module  155  may include, for example, a speaker or a receiver. The speaker may be used for general purposes, such as playing multimedia or playing record. The receiver may be used for receiving incoming calls. According to an embodiment, the receiver may be implemented as separate from, or as part of the speaker. 
     The display module  160  may visually provide information to the outside (e.g., a user) of the electronic device  101 . The display module  160  may include, for example, a display, a hologram device, or a projector and control circuitry to control a corresponding one of the display, hologram device, and projector. According to an embodiment, the display module  160  may include a touch sensor adapted to detect a touch, or a pressure sensor adapted to measure the intensity of force incurred by the touch. 
     The audio module  170  may convert a sound into an electrical signal and vice versa. According to an embodiment, the audio module  170  may obtain the sound via the input module  150 , or output the sound via the sound output module  155  or a headphone of an external electronic device (e.g., an electronic device  102 ) directly (e.g., wiredly) or wirelessly coupled with the electronic device  101 . 
     The sensor module  176  may detect an operational state (e.g., power or temperature) of the electronic device  101  or an environmental state (e.g., a state of a user) external to the electronic device  101 , and then generate an electrical signal or data value corresponding to the detected state. According to an embodiment, the sensor module  176  may include, for example, a gesture sensor, a gyro sensor, an atmospheric pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an infrared (IR) sensor, a biometric sensor, a temperature sensor, a humidity sensor, or an illuminance sensor. 
     The interface  177  may support one or more specified protocols to be used for the electronic device  101  to be coupled with the external electronic device (e.g., the electronic device  102 ) directly (e.g., wiredly) or wirelessly. According to an embodiment, the interface  177  may include, for example, a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, a secure digital (SD) card interface, or an audio interface. 
     A connecting terminal  178  may include a connector via which the electronic device  101  may be physically connected with the external electronic device (e.g., the electronic device  102 ). According to an embodiment, the connecting terminal  178  may include, for example, a HDMI connector, a USB connector, a SD card connector, or an audio connector (e.g., a headphone connector). 
     The haptic module  179  may convert an electrical signal into a mechanical stimulus (e.g., a vibration or a movement) or electrical stimulus which may be recognized by a user via his tactile sensation or kinesthetic sensation. According to an embodiment, the haptic module  179  may include, for example, a motor, a piezoelectric element, or an electric stimulator. 
     The camera module  180  may capture a still image or moving images. According to an embodiment, the camera module  180  may include one or more lenses, image sensors, image signal processors, or flashes. 
     The power management module  188  may manage power supplied to the electronic device  101 . According to one embodiment, the power management module  188  may be implemented as at least part of, for example, a power management integrated circuit (PMIC). 
     The battery  189  may supply power to at least one component of the electronic device  101 . According to an embodiment, the battery  189  may include, for example, a primary cell which is not rechargeable, a secondary cell which is rechargeable, or a fuel cell. 
     The communication module  190  may support establishing a direct (e.g., wired) communication channel or a wireless communication channel between the electronic device  101  and the external electronic device (e.g., the electronic device  102 , the electronic device  104 , or the server  108 ) and performing communication via the established communication channel. The communication module  190  may include one or more communication processors that are operable independently from the processor  120  (e.g., the application processor (AP)) and supports a direct (e.g., wired) communication or a wireless communication. According to an embodiment, the communication module  190  may include a wireless communication module  192  (e.g., a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module) or a wired communication module  194  (e.g., a local area network (LAN) communication module or a power line communication (PLC) module). A corresponding one of these communication modules may communicate with the external electronic device via the first network  198  (e.g., a short-range communication network, such as Bluetooth™, wireless-fidelity (Wi-Fi) direct, or infrared data association (IrDA)) or the second network  199  (e.g., a long-range communication network, such as a legacy cellular network, a 5G network, a next-generation communication network, the Internet, or a computer network (e.g., LAN or wide area network (WAN)). These various types of communication modules may be implemented as a single component (e.g., a single chip), or may be implemented as multi components (e.g., multi chips) separate from each other. The wireless communication module  192  may identify and authenticate the electronic device  101  in a communication network, such as the first network  198  or the second network  199 , using subscriber information (e.g., international mobile subscriber identity (IMSI)) stored in the subscriber identification module  196 . 
     The wireless communication module  192  may support a 5G network, after a 4G network, and next-generation communication technology, e.g., new radio (NR) access technology. The NR access technology may support enhanced mobile broadband (eMBB), massive machine type communications (mMTC), or ultra-reliable and low-latency communications (URLLC). The wireless communication module  192  may support a high-frequency band (e.g., the mmWave band) to achieve, e.g., a high data transmission rate. The wireless communication module  192  may support various technologies for securing performance on a high-frequency band, such as, e.g., beamforming, massive multiple-input and multiple-output (massive MIMO), full dimensional MIMO (FD-MIMO), array antenna, analog beam-forming, or large scale antenna. The wireless communication module  192  may support various requirements specified in the electronic device  101 , an external electronic device (e.g., the electronic device  104 ), or a network system (e.g., the second network  199 ). According to an embodiment, the wireless communication module  192  may support a peak data rate (e.g., 20 Gbps or more) for implementing eMBB, loss coverage (e.g., 164 dB or less) for implementing mMTC, or U-plane latency (e.g., 0.5 ms or less for each of downlink (DL) and uplink (UL), or a round trip of 1 ms or less) for implementing URLLC. 
     The antenna module  197  may transmit or receive a signal or power to or from the outside (e.g., the external electronic device) of the electronic device  101 . According to an embodiment, the antenna module  197  may include an antenna including a radiating element composed of a conductive material or a conductive pattern formed in or on a substrate (e.g., a printed circuit board (PCB)). According to an embodiment, the antenna module  197  may include a plurality of antennas (e.g., array antennas). In such a case, at least one antenna appropriate for a communication scheme used in the communication network, such as the first network  198  or the second network  199 , may be selected, for example, by the communication module  190  (e.g., the wireless communication module  192 ) from the plurality of antennas. The signal or the power may then be transmitted or received between the communication module  190  and the external electronic device via the selected at least one antenna. According to an embodiment, another component (e.g., a radio frequency integrated circuit (RFIC)) other than the radiating element may be additionally formed as part of the antenna module  197 . 
     According to various embodiments, the antenna module  197  may form a mmWave antenna module. According to an embodiment, the mmWave antenna module may include a printed circuit board, a RFIC disposed on a first surface (e.g., the bottom surface) of the printed circuit board, or adjacent to the first surface and capable of supporting a designated high-frequency band (e.g., the mmWave band), and a plurality of antennas (e.g., array antennas) disposed on a second surface (e.g., the top or a side surface) of the printed circuit board, or adjacent to the second surface and capable of transmitting or receiving signals of the designated high-frequency band. 
     At least some of the above-described components may be coupled mutually and communicate signals (e.g., commands or data) therebetween via an inter-peripheral communication scheme (e.g., a bus, general purpose input and output (GPIO), serial peripheral interface (SPI), or mobile industry processor interface (MIPI)). 
     According to an embodiment, commands or data may be transmitted or received between the electronic device  101  and the external electronic device  104  via the server  108  coupled with the second network  199 . Each of the electronic devices  102  or  104  may be a device of a same type as, or a different type, from the electronic device  101 . According to an embodiment, all or some of operations to be executed at the electronic device  101  may be executed at one or more of the external electronic devices  102 ,  104 , or  108 . For example, if the electronic device  101  should perform a function or a service automatically, or in response to a request from a user or another device, the electronic device  101 , instead of, or in addition to, executing the function or the service, may request the one or more external electronic devices to perform at least part of the function or the service. The one or more external electronic devices receiving the request may perform the at least part of the function or the service requested, or an additional function or an additional service related to the request, and transfer an outcome of the performing to the electronic device  101 . The electronic device  101  may provide the outcome, with or without further processing of the outcome, as at least part of a reply to the request. To that end, a cloud computing, distributed computing, mobile edge computing (MEC), or client-server computing technology may be used, for example. The electronic device  101  may provide ultra low-latency services using, e.g., distributed computing or mobile edge computing. In another embodiment, the external electronic device  104  may include an internet-of-things (IoT) device. The server  108  may be an intelligent server using machine learning and/or a neural network. According to an embodiment, the external electronic device  104  or the server  108  may be included in the second network  199 . The electronic device  101  may be applied to intelligent services (e.g., smart home, smart city, smart car, or healthcare) based on  5 G communication technology or IoT-related technology. 
     The electronic device according to various embodiments may be one of various types of electronic devices. The electronic devices may include, for example, a portable communication device (e.g., a smartphone), a computer device, a portable multimedia device, a portable medical device, a camera, a wearable device, or a home appliance. According to an embodiment of the disclosure, the electronic devices are not limited to those described above. 
     It should be appreciated that various embodiments of the present disclosure and the terms used therein are not intended to limit the technological features set forth herein to particular embodiments and include various changes, equivalents, or replacements for a corresponding embodiment. With regard to the description of the drawings, similar reference numerals may be used to refer to similar or related elements. It is to be understood that a singular form of a noun corresponding to an item may include one or more of the things, unless the relevant context clearly indicates otherwise. As used herein, each of such phrases as “A or B,” “at least one of A and B,” “at least one of A or B,” “A, B, or C,” “at least one of A, B, and C,” and “at least one of A, B, or C,” may include any one of, or all possible combinations of the items enumerated together in a corresponding one of the phrases. As used herein, such terms as “1st” and “2nd,” or “first” and “second” may be used to simply distinguish a corresponding component from another, and does not limit the components in other aspect (e.g., importance or order). It is to be understood that if an element (e.g., a first element) is referred to, with or without the term “operatively” or “communicatively”, as “coupled with,” “coupled to,” “connected with,” or “connected to” another element (e.g., a second element), it means that the element may be coupled with the other element directly (e.g., wiredly), wirelessly, or via a third element. 
     As used in connection with various embodiments of the disclosure, the term “module” may include a unit implemented in hardware, software, or firmware, and may interchangeably be used with other terms, for example, “logic,” “logic block,” “part,” or “circuitry”. A module may be a single integral component, or a minimum unit or part thereof, adapted to perform one or more functions. For example, according to an embodiment, the module may be implemented in a form of an application-specific integrated circuit (ASIC). 
     Various embodiments as set forth herein may be implemented as software (e.g., the program  140 ) including one or more instructions that are stored in a storage medium (e.g., internal memory  136  or external memory  138 ) that is readable by a machine (e.g., the electronic device  101 ). For example, a processor (e.g., the processor  120 ) of the machine (e.g., the electronic device  101 ) may invoke at least one of the one or more instructions stored in the storage medium, and execute it, with or without using one or more other components under the control of the processor. This allows the machine to be operated to perform at least one function according to the at least one instruction invoked. The one or more instructions may include a code generated by a compiler or a code executable by an interpreter. The machine-readable storage medium may be provided in the form of a non-transitory storage medium. Wherein, the term “non-transitory” simply means that the storage medium is a tangible device, and does not include a signal (e.g., an electromagnetic wave), but this term does not differentiate between where data is semi-permanently stored in the storage medium and where the data is temporarily stored in the storage medium. 
     According to an embodiment, a method according to various embodiments of the disclosure may be included and provided in a computer program product. The computer program product may be traded as a product between a seller and a buyer. The computer program product may be distributed in the form of a machine-readable storage medium (e.g., compact disc read only memory (CD-ROM)), or be distributed (e.g., downloaded or uploaded) online via an application store (e.g., PlayStore™), or between two user devices (e.g., smart phones) directly. If distributed online, at least part of the computer program product may be temporarily generated or at least temporarily stored in the machine-readable storage medium, such as memory of the manufacturer&#39;s server, a server of the application store, or a relay server. 
     According to various embodiments, each component (e.g., a module or a program) of the above-described components may include a single entity or multiple entities, and some of the multiple entities may be separately disposed in different components. According to various embodiments, one or more of the above-described components may be omitted, or one or more other components may be added. Alternatively or additionally, a plurality of components (e.g., modules or programs) may be integrated into a single component. In such a case, according to various embodiments, the integrated component may still perform one or more functions of each of the plurality of components in the same or similar manner as they are performed by a corresponding one of the plurality of components before the integration. According to various embodiments, operations performed by the module, the program, or another component may be carried out sequentially, in parallel, repeatedly, or heuristically, or one or more of the operations may be executed in a different order or omitted, or one or more other operations may be added. 
       FIG. 2  is a block diagram  200  illustrating a camera module  180  according to an embodiment. Referring to  FIG. 2 , the camera module  180  may include a lens assembly  210 , a flash  220 , an image sensor  230 , an image stabilizer  240 , a memory  250  (e.g., a buffer memory), or an image signal processor  260 . The lens assembly  210  may collect light emitted from a subject to be captured as an image. The lens assembly  210  may include one or more lenses. According to an embodiment, the camera module  180  may include a plurality of lens assemblies  210 . In this case, the camera module  180 , for example, may be implemented as a dual camera, a 360-degree camera, or a spherical camera. Some of the plurality of lens assemblies  210  may have the same lens properties (e.g., a field of view, a focal length, autofocus, f numbers, or optical zoom), or at least one lens assembly may have one or more lens properties that are different from the lens properties of other lens assemblies. The lens assembly  210 , for example, may include a wide-angle lens or a telephoto lens. 
     The flash  220  may emit light in order to compensate for an insufficient amount of light during photography. According to an embodiment, the flash  220  may include one or more light-emitting diodes (e.g., red-green-blue (RGB) LEDs, a white LED, an infrared LED, or an ultraviolet LED) or a xenon lamp. The image sensor  230  may convert the light emitted or reflected from a subject and transmitted through the lens assembly  210  into an electrical signal, thereby obtaining an image corresponding to the subject. According to an embodiment, the image sensor  230  may include, for example, one image sensor selected from various image sensors having different properties, such as an RGB sensor, a black-and-white (BW) sensor, an IR sensor, or a UV sensor, a plurality of image sensors having the same properties, or a plurality of image sensors having different properties. Each image sensor included in the image sensor  230  may be implemented using, for example, a charged coupled device (CCD) sensor or a complementary metal oxide semiconductor (CMOS) sensor. 
     In response to movement of the camera module  180  or the electronic device  101  including the same, the image stabilizer  240  may move at least one lens included in the lens assembly  210  or the image sensor  230  in a specific direction, or control the operation characteristics of the image sensor  230  (for example, control the read-out timing or the like). This makes it possible to compensate for at least some of the negative effects on the image to be captured due to the movement thereof. According to an embodiment, the image stabilizer  240 , may detect such movement of the camera module  180  or the electronic device  101  using a gyro sensor (not shown) or an acceleration sensor (not shown) disposed inside or outside the camera module  180 . According to an embodiment, the image stabilizer  240  may be implemented as, for example, an optical image stabilizer or optical image stabilization (OIS). The memory  250  may at least temporarily store at least some of the images obtained through the image sensor  230  for a subsequent image processing operation. For example, if obtaining of the image by a shutter is delayed or if a plurality of images is obtained at a high speed, the obtained original images (e.g., the Bayer-patterned images or high-resolution images) may be stored in the memory  250 , and copy images corresponding thereto (e.g., low-resolution images) may be previewed through the display module  160 . Thereafter, if a specified condition is satisfied (e.g., a user input or a system command), at least some of the original images stored in the memory  250  may be obtained and processed by, for example, the image signal processor  260 . According to an embodiment, the memory  250  may be configured as at least part of the memory  130  or a separate memory operated independently of the same. 
     The image signal processor  260  may perform one or more image processing operations on the images obtained through the image sensor  230  or the images stored in the memory  250 . One or more image processing operations may include, for example, depth map generation, three-dimensional modelling, panorama production, feature point extraction, image synthesis, or image compensation (e.g., noise reduction, resolution adjustment, brightness adjustment, blurring, sharpening, or softening). Additionally or alternatively, the image signal processor  260  may perform control (e.g., exposure time control, readout timing control, or the like) for at least one of the elements (e.g., the image sensor  230 ) included in the camera module  180 . The image processed by the image signal processor  260  may be stored again in the memory  250  for further processing, or may be provided to an external element (e.g., the memory  130 , the display module  160 , the electronic device  102 , the electronic device  104 , or the server  108 ) of the camera module  180 . According to an embodiment, the image signal processor  260  may be configured as at least part of the processor  120  or as a separate processor operated independently of the processor  120 . In the case where the image signal processor  260  is configured as a separate processor from the processor  120 , at least one image processed by the image signal processor  260  may be displayed through the display module  160  by the processor  120  without further processing or after further image processing. 
     According to an embodiment, the electronic device  101  may include a plurality of camera modules  180  having different properties or functions from each other. In this case, for example, at least one of the plurality of camera modules  180  may be a wide-angle camera, and at least another one thereof may be a telephoto camera. Similarly, at least one of the plurality of camera modules  180  may be a front camera, and at least another one thereof may be a rear camera. 
       FIG. 3  is a block diagram illustrating operations of elements of an electronic device according to an embodiment of the disclosure. According to an embodiment, the electronic device  300  may include a processor  301 , a power management integrated circuit (PMIC)  302 , a camera module  330 , and a flash module  340 , and some of the illustrated elements may be omitted or substituted. The electronic device may further include at least some of the configurations and/or perform at least some of the functions of the electronic device  101  in  FIG. 1 . At least some of the respective elements shown (or not shown) of the electronic device may be operatively, functionally, and/or electrically connected to each other. 
     According to an embodiment, the processor  301  may perform operations or data processing related to control and/or communication of the respective elements of the electronic device, and may be configured as one or more processors  301 . The processor  301  may include at least some of the configurations and/or functions of the processor  120  in  FIG. 1 . 
     According to an embodiment, while not limiting the operations and data processing functions capable of being performed by the processor  301  in the electronic device, hereinafter, a detailed description will be made of the features related to control of the camera module  330  and the flash module  340 . The operations of the processor  301  may be performed by loading the instructions stored in a memory (not shown). 
     According to an embodiment, the processor  301  may activate the camera module  330  and receive obtained image data from the camera module  330 . For example, the processor  301  may transmit a photographing signal to the camera module  330 , based on a user input, and the camera module  330  may produce image data corresponding to the photographing signal and transmit the same to the processor  301 . 
     According to an embodiment, the processor  301  may obtain information on a subject, the focal length, and the amount of light from received image data. The camera module  330  may recognize a subject placed in front thereof and transmit information on the subject to the processor  301 . In addition, the camera module  330  may measure the focal length, which is the distance between the point on which the light incident on the lens of the camera converges and the camera sensor, and transmit information thereon to the processor  301 . In addition, the processor  301  may control the flash module  340  through the camera module  330 , and the camera module  330  may measure information on the amount of light projected from the flash module  340  and transmit information thereof to the processor  301 . 
     According to an embodiment, the processor  301  may control the PMIC  302  such that the flash module  340  may output light. According to this signal, the PMIC  302  may supply current to the flash module  340  and operate the flash module  340 . The flash module  340  may be supplied with the current required for operation from the PMIC  302 . 
     According to an embodiment, the electronic device  300  may include a plurality of camera modules. The electronic device  300  may further include at least one other camera module in addition to the camera module  330 . The camera module  330  and at least one other camera module may be disposed in the electronic device  300  in the same direction to obtain images of an external object (e.g., a subject), or may be disposed in the different directions to obtain images of different external objects (e.g., subjects). 
     According to an embodiment, the flash module  340  may include an LED, a light-emitting diode, or a xenon lamp. Two or more lenses (a wide-angle lens, an ultra-wide-angle lens, or a telephoto lens) and image sensors may be disposed on one surface of the electronic device  300 . In addition, the flash module  340  may provide a light source that interworks with the camera module  330 . In addition, the flash module  340  may be disposed adjacent to the camera module  330 . 
       FIG. 4  is a structural diagram of an electronic device according to an embodiment of the disclosure. 
     The electronic device may include an LED  420 , a PCB area  410  on which the LED  420  is mounted, a flash lens  430 , and a window plate  440 . The LED  420  may emit light toward the center of the flash lens  430 , and the light emitted from the LED  420  may reach the subject through the flash lens  430 . The flash lens  430  may include a diffusion pattern area on one surface, which may serve to diffuse light. 
       FIG. 5  illustrates paths and distribution of light when capturing an image using a conventional electronic device. 
     Referring to  FIG. 5 , the light  501  emitted from the LED  420  may reach the central portion  510  and the peripheral portions  521  and  522  through the flash lens  430 . As shown in  FIG. 5 , it can be identified that a larger amount of light reaches the central portion  510  that is relatively close to the flash lens  430  and that a smaller amount of light reaches the peripheral portions  512  and  522  that are far therefrom compared to that of the central portion  510 . In this case, when capturing an image, the cave-like phenomenon may occur in which the peripheral portions of the image are dark, whereas the central portion of the image may have glare due to reception of the large amount of light. 
       FIG. 6  is a three-dimensional view illustrating a model of an optical lens of an electronic device according to an embodiment of the disclosure. A lens support structure  601  may be provided on the lower portion of the optical lens to support the optical lens. The lens support structure  601  may come into contact with a first surface, and may be positioned on the peripheral portion of the first surface, instead of the central portion thereof, such that the light emitted from the LED is able to reach the first surface. 
       FIG. 7  is a structural diagram of an electronic device according to an embodiment of the disclosure. 
     The electronic device  300  may include a housing  700 , a window plate  720 , a camera module  730 , and a flash module. According to an embodiment, the flash module may include an optical lens  710  and an LED  740 . In addition, a lens support structure  601  for supporting the optical lens  710  may be positioned under the optical lens  710 . As described with reference to  FIG. 6  above, the lens support structure  601  may come into contact with the first surface (e.g. a surface of the optical lens  710 ), and may be positioned on the peripheral portion of the first surface, instead of the central portion thereof, such that the light emitted from the LED  740  is able to reach the first surface. 
     According to an embodiment, the window plate  720  may include a transparent area  722  that transmits light and an opaque area  721  that blocks light. The window plate  720  may be positioned above the camera module  730  and the LED  740 . The window plate  720  may be include the transparent area  722  allowing light to enter the camera module  730 , and may also include additional transparent area  722  allowing light to project from the LED  740 , and the remaining portions thereof may be configured as the opaque area  721  to block light. 
     According to an embodiment, the optical lens  710  may include a first surface in the direction facing the LED  740 , that is, the direction in which the light emitted from the LED  740  is incident, and a second surface in the direction opposite the first surface, that is, the direction facing the subject. The optical lens  710  may include a diffusion pattern area  714  on the first surface, and include a first translucent area  711 , a second translucent area  712 , and a transparent area  713  on the second surface. 
     According to an embodiment, the diffusion pattern area  714  may serve to primarily diffuse light emitted from the LED  740 . The diffusion pattern area  714  may include a plurality of circular sawtooth diffusion patterns that are radially arranged. The diffusion pattern area  714  may constitute the entirety of the first surface or only a portion of the first surface that covers the LED light projection area. The light emitted from the LED  740  may travel to the second surface through the diffusion pattern area  714  of the first surface. The transparent area  713  may be formed between the first surface and the second surface. 
     According to an embodiment, the second surface may reduce the amount of transmission light toward the center of the optical lens  710 , thereby reducing the illuminance of the central portion. In addition, the second surface may include a translucent area in the peripheral portion in order to increase the amount of light directed to the periphery of the optical lens  710 , thereby increasing the illuminance of the peripheral portion. 
     According to an embodiment, the transmittance of the first translucent area  711 , the transmittance of the second translucent area  712 , and the transmittance of the diffusion pattern area  714  may be the same. In addition, the transmittance of the transparent area  713  may be higher than the transmittance of the first translucent area  711  and the transmittance of the second translucent area  712 . 
     According to an embodiment, the size and position of the first translucent area  711  may correspond to the size and position of the LED  740 . In addition, the size and position of the first translucent area  711  may be affected by the light characteristics (e.g., a light incident angle and a direction in which light is directed) of the LED  740 . For example, if the light incident angle of the LED  740  is largely biased towards the center, the need to guide the light to the peripheral portion may increase to prevent glare. In this case, the size and position of the first translucent area  711  may be determined to guide the light to the peripheral portion. In addition, the size and position of the second translucent area  712  may be determined according to a variable K (described below) indicating a positional relationship between the first camera module  730  and the LED  740 . 
       FIG. 8  is a plan view of an optical lens constituting an electronic device according to an embodiment of the disclosure. 
     According to an embodiment, the optical lens  800  may include a first translucent area  810  in the window plate  820 .  FIG. 8  is a plan view of the optical lens  800 , which illustrates a second surface on the side of the window plate  720 . It has been described with reference to  FIG. 7  above that the second surface includes a first translucent area  810  and a second translucent area. The first translucent area  810  may be configured to correspond to the LED  801  or to envelope the LED  801  in the plan view. The size and positioning of the second translucent area will be described below with reference to  FIGS. 9 to 12 . 
       FIG. 9  is a plan view of an optical lens constituting an electronic device according to an embodiment of the disclosure. 
     It has been described with reference to  FIG. 7  above that the flash module of the electronic device  300  may include the optical lens  710 , that the optical lens  710  may include the first surface and the second surface, and that the first translucent area  711 , the second translucent area  712 , and the transparent area  713  may be formed on the second surface of the optical lens  710 . The light projected from the LED  740  may reach the second surface  910  through the diffusion pattern area  714  of the first surface. Hereinafter, the process of determining the position and size of the second translucent area  920  on the second surface will be described in detail. 
     According to an embodiment, the size of the second translucent area  920  may be determined according to a variable K  925  indicating a positional relationship between the camera module  900  and the LED  930 . 
     According to an embodiment, the first point  911  and the second point  912  may be positioned on the second surface  910 , and the first point  911  may correspond to the point closest to the center  901  of the camera module  900  when viewed from the front of the electronic device  300 , and the second point  912  may correspond to the point farthest from the center  901  of the camera module  900  when viewed from the front of the electronic device  300 . 
     According to an embodiment, the second translucent area  920  may be a bow-shaped area formed between the first point  911  and a point that is spaced apart therefrom in the direction to the center of the optical lens, where the size of the space corresponds to the variable K  925 , and a bow-shaped area formed between the second point  912  and a point that is spaced apart therefrom in the direction to the center of the optical lens, where the size of the space corresponds to the variable K  925 . 
     The variable K  925  may be used to determine the size and position of the second translucent area  920 , and the variable K  925  may be affected by the fov of the camera module  900 , the fov of the LED  740 , the separated distance between the LED  740  and the camera module  900 , and the diameter of the area of the optical lens  800 . A process of determining the variable K  925 , and the position and size of the second translucent area using the variable K  925  will be described in detail with reference to  FIGS. 10 to 12 . 
       FIG. 10  is a diagram illustrating a process of obtaining a variable K according to an embodiment of the disclosure. 
     According to an embodiment, the size of the second translucent area  920  may be determined according to the variable K  925 . As described with reference to  FIG. 7  above, the variable K  925  is determined according to a positional relationship between the camera module  1001  and the LED  1002 . Hereinafter, a detailed process of obtaining the variable K will be described. 
     According to an embodiment, the variable K  925  may satisfy the following conditions (1), (2), (3) and (4). 
         X=h /tan(90− A/ 2)°  (1)
 
         Y=h /tan(90− B/ 2)°  (2)
 
         Z=X−Y+c    (3)
 
         K =( Z *diameter of LED)/2 Y    (4)
 
     First, X  1010  may be the distance corresponding to the half of the photographing area of the camera module  1001 , and the photographing area may vary depending on the distance to the subject. Hereinafter, a process of obtaining the variable K  925  will be described in detail on the condition that the vertical distance between the camera module  1001  and the subject is configured as h  1040 . 
     X  1010  may be obtained using h  1040  and A  1011 . A  1011  may represent a photographing angle of the camera module  1001 , and if the half of A  1011  and the value h  1040  are given, the value X  1010  corresponding to the base of the triangle may be obtained using the trigonometric function. This may be expressed as follows. X=h/tan(90−A/2)° 
     Y  1020  may be obtained using h  1040  and B  1021 . As described above, B  1021  represents a projection angle of the LED  1002 , and h  1040  represents the vertical distance to the subject. If the half of B  1021  and the value h  1040  are given, the value Y  1020  corresponding to the base of the triangle may be obtained using the trigonometric function. This may be expressed as follows. Y=h/tan(90−B/2)° 
     Z  1030  may be obtained using X  1010 , Y 1020 , and c  1015 . c  1015  indicates the distance between the center of the camera module  1001  and the center of the LED  1002 . The value Z  1030  may be obtained by adding c  1015  to X  1010  and then subtracting Y  1020  therefrom. This may be summarized and expressed as follows. Z=X−Y+c 
     The variable K  925 , which is an arbitrary variable for obtaining the position and size of the second translucent area  920 , may be represented using the diameter of the LED  1002 , Z  1030 , and Y  1020 . According to an embodiment, the variable K may be defined as follows. K=(Z*diameter of LED)/2Y 
     According to an embodiment, the distance  1040  between the center of the camera module  1001  and the subject may be based on 100 mm, which is an appropriate test reference distance. The distance  1040  between the center of the camera module  1001  and the subject is not fixed to 100 mm, and may be configured differently. 
     According to an embodiment, the distance between the camera module  1001  and the LED  1002  may be determined in consideration of a photographing range of the camera module  1001  and an emission range of the LED  1002 . For example, the distance between the camera module  1001  and the LED  1002  may include 12.5 mm. In this case, the light emission area of the LED  1002  may include the photographing range of the camera module  1001 . Accordingly, the light emitted from the LED may reach the entire photographing range of the camera module  1001 , thereby obtaining an image in which the difference in brightness between the central portion and the peripheral portion is not large. However, the distance between the camera module  1001  and the LED  1002  is not limited to 12.5 mm, and any value may be considered as an appropriate distance as long as the light emission range of the LED  1002  includes the photographing range of the camera module  1001  in consideration of the photographing range of the camera module  1001  and the light emission range of the LED  1002 . 
       FIG. 11  illustrates a process of obtaining a variable K according to an embodiment of the disclosure. 
     According to an embodiment, the angle A  1101  and the length of the surface b  1110  facing A  1101  may be required to obtain the length of the base a  1100 . If one angle of a right triangle is given, the remaining angles may be obtained. That is, the angle A  1110  may be obtained using angle B  1111  that is the other non-right angle of the triangle. If the half of the field of view of the camera module  1001  is angle B  1111 , the angle A  1101  may be obtained using the same. Assuming that the length of the vertical side b  1110  is h  1040  in  FIG. 10 , the length of the base a  1100  may be obtained. This may be expressed as the following equation. 
         a=b/ tan(90− B )= b /tan( A )
 
     According to an embodiment, this principle may be applied to  FIG. 10 . X  1010  may be obtained using the field of view A  1011  and h  1040  of the camera module  1001 . In addition, Y  1020  may be obtained using the field of view B  1020  and h  1040  of the LED  1002 . As described with reference to  FIG. 10  above, Z  1030  may be obtained using X  1010 , Y  1020 , and c  1015 . The variable K may be obtained through this process. 
       FIG. 12  illustrates a process of determining a translucent area in the case where there is a plurality of camera modules according to an embodiment of the disclosure. 
     According to an embodiment, the electronic device  300  may include a flash module and a plurality of camera modules. Hereinafter, a description will be made on the assumption that the electronic device  300  includes one optical lens area  1230 , a first camera module  1210 , and a second camera module  1220 . 
     According to an embodiment, as described with reference to  FIG. 7  above, a first translucent area may be determined according to the position of the LED, and the position of the second translucent area may be determined according to the position of the camera module. 
     According to an embodiment, the position of the second translucent area  1231  may be determined using relative positions of the first camera module  1210  and the LED, and a variable K 1 . In addition, the position of the second translucent area  1232  may be determined using relative positions of the second camera module  1220  and the LED  1230 , and a variable K 2 . A detailed process thereof is the same as that described in  FIGS. 10 and 11 . 
     According to an embodiment, the second surface may include a first point  1201 , a second point  1202 , a third point  1203 , and a fourth point  1204 , wherein the first point  1201  may correspond to the point closest to the center of the first camera module when viewed from the front of the electronic device, wherein the second point  1202  may correspond to the point farthest from the center of the first camera module when viewed from the front of the electronic device, wherein the third point  1203  may correspond to the point closest to the center of the second camera module when viewed from the front of the electronic device, and wherein the fourth point  1204  may correspond to the point farthest from the center of the second camera module when viewed from the front of the electronic device. 
     According to an embodiment, only an overlapping portion between the second translucent area  1231  of the first camera module  1210  and the second translucent area  1232  of the second camera module  1220  may be determined as a final translucent area  1240 . 
       FIG. 13  is a side view of the structure of an electronic device according to an embodiment of the disclosure. 
     According to an embodiment, the electronic device may include a camera deco glass  1310 , a translucent area  1320 , an optical lens  1330 , an LED  1340 , and a camera module  1305 . The camera deco glass  1310  may be provided on the front part of the optical lens  1330  to protect the surface of the optical lens  1330  from external impact. The roles and positions of the translucent area  1320 , the optical lens  1330 , the LED  1340 , and the camera module  1305  have been described in detail with reference to  FIG. 7 . 
     According to an embodiment, the field of view  1301  of the LED  1340  may be for example 76 degrees. The field of view  1302  of the camera module  1305  may be for example 79 degrees. The field of view  1301  of the LED  1340  may be expanded to 121 degrees, which is increased by 45 degrees, by applying the optical lens  1330  including the translucent area  1320 . If the field of view  1301  of the LED  1340  is expanded, the area capable of being photographed by the camera module  1350  and the light emission area that the light produced by the LED  1340  are more overlapped. As the area capable of being photographed by the camera module  1350  increasingly overlaps the light emission area that the light produced by the LED  1340 , it is possible to capture images in which the light is evenly spread to the periphery of the images. 
       FIG. 14  is a plan view illustrating a conventional optical lens and an optical lens to which a translucent area is applied according to an embodiment of the disclosure. 
     According to an embodiment, since the distance between the LED  1404  and a subject is usually shorter than the distance to the background, the illuminance of the image may be uneven. Accordingly, the subject in the image may be shiny, and the background in the image may be relatively dark. 
     An improved optical lens  1401  of the disclosure may have an LED  1404  positioned at the center thereof, and the light may pass through a second surface of the optical lens positioned on the side of the window plate. As shown in  FIG. 14 , the second surface of the optical lens may include translucent areas  1410  and  1420 . 
     According to an embodiment, a first translucent area  1410  may be positioned at the central portion of the second surface  1402  of the optical lens, a second translucent area  1420  may be positioned at the peripheral portion of the second surface  1402  of the optical lens, and a transparent area  1430  may be positioned at the remaining portions of the second surface  1402  of the optical lens, excluding the first translucent area  1410  and the second translucent area  1420 . The configurations of the optical lens  1401  may be compared with components  1431 - 1434  of the conventional optical lens  1431 . 
     According to an embodiment, the size and position of the first translucent area  1410  may be determined according to the size and position of the LED  1403 . 
     According to an embodiment, the size and position of the second translucent area  1420  may be determined according to a variable K indicating a positional relationship between the first camera module and the LED. 
     According to an embodiment, the first translucent area  1410  positioned at the central portion of the second surface  1402  of the optical lens may reduce the amount of light directed to the subject from the center. Accordingly, the glare on the subject may be prevented. In addition, the second translucent area  1420  positioned at the peripheral portion of the second surface  1402  of the optical lens may refract the light directed to the peripheral portion to expand the light emission area, and increase the amount of light reaching the peripheral portion. That is, the peripheral portion (background) of the image may be relatively brightened through the second translucent area  1420 . In addition, the brightness of the outermost portion may be even, thereby maintaining a constant average brightness of the light emission area. According to this, an image in which light is evenly distributed may be obtained. 
       FIG. 15  illustrates a model of an optical lens of an electronic device according to an embodiment of the disclosure. 
     According to an embodiment, the optical lens may include a first translucent area  1510  at the central portion thereof, and include a second translucent area  1520  at the peripheral portion thereof. The translucent areas  1510  and  1520 , unlike the transparent area  1500 , may be made using various methods such as sand-blasting, acid-etching, or attaching a translucent film. In the case of using the methods of sand-blasting and acid-etching, the transmittance may be changed through surface treatment of the transparent area. In the case of using the method of attaching a translucent film, the translucent areas  1510  and  1520  may have a material different from that of the transparent area  1500 , thereby making a difference in the transmittance. 
       FIG. 16  is a plan view of an optical lens of an electronic device according to an embodiment of the disclosure. 
     According to an embodiment, the optical sensor may include a first translucent area  1610  at the central portion thereof, and include a second translucent area  1620  at the peripheral portion thereof. The remaining portions, excluding the first translucent area  1610  and the second translucent area  1620 , may correspond to a transparent area  1600  in the cross section of the optical sensor. The translucent areas  1610  and  1620 , unlike the transparent area  1600 , may be made using at least one of the methods of sand-blasting, acid-etching, or attaching a translucent film. As described with reference to  FIG. 15  above, the translucent areas  1610  and  1620  may have a material different from that of the transparent area  1600 . 
       FIG. 17  illustrates a process of determining transparency of a translucent area of an electronic device according to an embodiment of the disclosure. 
     According to an embodiment, as the distance from the light source increases, the illuminance may decrease, and the light emission area may increase. If the distance from the light source is D, the illuminance may be L, and the light emission area may be A. If the distance from the light source is 2D, the illuminance may be L/4, and the light emission area may be 4 A. If the distance from the light source is 3D, the illuminance may be L/9, and the light emission area may be 9 A. In the  FIG. 17  example, the unit of illuminance may be Lux, the unit of distance may be meters, and the unit of area may be square meters. 
     According to an embodiment, the required amount of light and the light emission area may vary depending on the distance from the light source, so the amount of light from the LED and the transparency of the translucent area of the optical sensor may be determined according. For example, in the case where a large amount of light is required due to a large light emission area, the amount of light passing through may be increased by increasing the transparency. In the case where the amount of emitted light is required to be reduced, the amount of light passing through may be reduced by lowering the transparency. 
       FIG. 18  is a flowchart illustrating the operation of an electronic device according to an embodiment of the disclosure. 
     According to an embodiment, in operation  1800 , the processor of the electronic device may control the camera module. That is, the processor may turn on/off the camera module. 
     In operation  1810 , if the camera module is operated by the processor, the camera module may recognize a subject and identify a focal length. The focal length may indicate the distance between the point on which the light entering through the camera lens converges and the camera sensor. The camera module may transmit subject recognition information and focal length information to the processor. 
     In operation  1820 , the camera module may measure light according to the position of the subject and the focal length. Here, measuring light may refer to a process of calculating the intensity of light. Projection of light is done by a flash module, and the processor may control the operation of the flash module through a PMIC. 
     In operation  1830 , when the measuring light is performed by the camera module, the camera module may transmit corresponding information to the processor. The processor may adjust configuration of international standard organization (ISO) sensitivity, a shutter speed, and aperture of the camera module, based on the received light measuring information. 
     In operation  1840 , when the sensitivity, the shutter speed, and the aperture of the camera module are configured by the processor, the processor may turn on the flash module. The flash module turned on by the processor may include an LED and an optical lens, and may project light using the internal LED. The process in which the light projected from the LED evenly reaches the subject and the background area through the first surface and the second surface of the optical lens has been described with reference to  FIGS. 7 to 11 . 
       FIG. 19  is a detailed view illustrating the structure of an optical lens according to an embodiment of the disclosure. 
     According to an embodiment, the optical lens  1900  may include a first translucent area  1901 , a second translucent area  1902 , and a transparent area  1903  on one surface thereof As described with reference to  FIG. 7  above, the first translucent area  1901  may control a first illuminance of the central area of an image, the second translucent area  1902  may control a second illuminance of the peripheral area of the image, and the transparent area  1903  may transmit the entire light emitted from the LED because the transparency thereof is about 100%. 
     According to an embodiment, the optical lens  1900  may include a first surface  1910  and a second surface  1920 . As described with reference to  FIG. 7  above, the first surface  1910 , which is one surface of the optical lens  1900 , may be positioned on the side of the LED side and include a diffusion pattern area that controls a diffusion range of the light emitted from the LED, and the second surface  1920 , which is the other surface of the optical lens  1900 , may be positioned on the side of the window plate and include the first translucent area  1901 , the second translucent area  1901 , and the transparent area  1903 . 
       FIG. 20  illustrates a camera module and a light emission angle of an LED according to an embodiment of the disclosure. 
     According to an embodiment, a camera module  2010  may have a field of view (FOV) of 79 degrees, and an LED  2020  may have a field of view (FOV) of 76 degrees. If the light emission angle of the LED  2020  is 76 degrees, it is difficult to cover cameras having a standard field of view of 79 degrees and a wide field of view of 120 degrees. 
     In addition, since the photographing range of the camera module  2010  and the light emission range  2021  of the LED  2020  are different, there may be an area  2011  in which light emitted from the LED  2020  fails to reach the camera module  2010 . In this case, the cave-like phenomenon may occur in the corresponding area  2011  of captured images. On the other hand, the area  2031  close to the LED  2020  may have glare in the captured images because a relatively large amount of light emitted from the LED  2020  reaches the area. 
       FIG. 21  illustrates a camera module and a light emission angle of an LED according to an embodiment of the disclosure. 
     According to an embodiment, a camera module  2110  may have a field of view (FOV) of 79 degrees, and an LED  2120  may have a field of view (FOV) of 76 degrees. But in  FIG. 21 , in contrast with  FIG. 20 , the light emission angle of the LED  2120  may increase according to the transparency of a translucent area. 
     According to an embodiment, a projection angle of the LED  2120  may be adjusted by adjusting the transparency of the translucent area of an optical sensor. When the transparency of the translucent area is 9 0 %, the projection angle of the LED  2120  may be 76 degrees, when the transparency of the translucent area is 50%, the projection angle of the LED  2120  may be 121 degrees, which is increased by 45 degrees, when the transparency of the translucent area is 59%, the projection angle of the LED  2120  may be 116 degrees, which is increased by 40 degrees, and when the transparency of the translucent area is 25%, the projection angle of the LED  2120  may be 136 degrees, which is increased by 60 degrees. 
     According to an embodiment, if the light emission angle of the LED  2120  is changed, the light emission area of the LED  2120  may be changed, and the light emission area of the LED  2120  may be adjusted by adjusting the transparency of the optical lens.  FIG. 22  illustrates the direction of light passing through a translucent area according to an embodiment of the disclosure. 
     According to an embodiment, the LED incident light  2210  may be incident on the optical lens  2220  in parallel. The optical lens  2220  may include a first surface  2221  including a diffusion pattern area, and a second surface  2222  including a transparent area  2223 , a first translucent area, and a second translucent area. The lens transmission light  2230  passing through the optical lens  2220  may be directed toward the peripheral portion, or may be redirected toward the central portion. This may increase the light emission area and the emission angle, and, as a result, an increased amount of light may reach the peripheral portion of the image. As shown in  FIG. 22 , the transmittance of the translucent area may be changed, and the light emission angle may be changed according to a change in the transmittance as described above. 
       FIG. 23  illustrates a method of implementing a translucent area according to an embodiment of the disclosure. 
     According to an embodiment, the translucent area may be implemented using methods of sand-blasting  2310 , acid-etching  2320 , or attaching a translucent film  2330 . Using the method of sand-blasting  2310 , the translucent area becomes opaque by roughening the surface thereof through spraying high-pressure emery. Using the method of acid-etching  2320 , the translucent area becomes opaque by performing an acid-etching process while maintaining the surface smooth. Using the method of attaching a translucent film  2330 , the translucent area becomes opaque by mixing impurities during production of a film. 
     According to an embodiment, in the case of sand-blasting  2310 , a desired transparency may be obtained using an abrasive onto the surface of the flash lens or deco glass. In the case of acid-etching  2320 , like the sand-blasting  2310 , a desired transparency may be obtained using an abrasive onto the surface of the flash lens or deco glass. However, since the acid-etching  2320  provides a smooth surface, it may further have an advantage in which light is smoothly expanded compared with the sand-blasting  2310 . The method of attaching a translucent film  2330  uses a film having a predetermined transparency, and may have an advantage of more accurately realizing a desired transparency. 
     According to an embodiment, the transparency of the translucent area may be determined in consideration of a required light emission area and a distance to the subject, and the details thereof have been described above with reference to  FIGS. 21 to 23 . 
       FIG. 24  illustrates an image captured using a conventional electronic device. According to an embodiment, the peripheral portion may be divided into left upper corner  00  and lower corner  42 , and right upper corner  06  and lower corner  48 . The brightness of the left upper corner area  00  is measured to be 66.5, the brightness of the right upper corner area  06  is measured to be 64.2, the brightness of the left lower corner  42  area is measured to be 80.3, and the brightness of the right lower corner  48  area is measured to be 76.9. The unit of measurement for the brightness is lux. The flash device is located in the left lower corner  42  area. Therefore, it can be seen that the left lower corner  42  has the highest brightness value and that this value decreases as it gets closer to the upper corner. In particular, the right upper corner  06  area, which is farthest from the flash, has the minimum brightness value of 64.2. 
     According to an embodiment, the peripheral brightness may indicate a degree of relative brightness with respect to the central area  24 . An appropriate degree of a peripheral brightness value may be based on 60%, which may vary depending on the configuration of the cameras and the flash. 
     According to an embodiment, a vignetting value may indicate a relative value obtained by comparing the brightness of the left upper corner  00  and lower corner  42 , and right upper corner  06  and lower corner  48  areas with the brightness of the peripheral regions thereof. The peripheral regions may include up to 10% of the four corner areas. 
     According to an embodiment, the vignetting value of the left upper corner area is 0.887, the vignetting value of the right upper corner area is 0.948, the vignetting value of the left lower corner area is 0.935, and the vignetting value of the right lower corner area is 0.962. An appropriate reference of the vignetting value may be 0.9 to 1.03, which may vary depending on the configuration of the cameras and the flash. It can be seen that the vignetting value of the left upper corner area is 0.887 when photographing according to the prior art, which falls outside of 0.9 to 1.03 and is thus inappropriate. 
       FIG. 25  illustrates an image captured by applying a translucent area to an electronic device according to an embodiment of the disclosure. 
     According to an exemplary embodiment, the peripheral portion may be divided into left upper corner  00  and lower corner  42 , and right upper corner  06  and lower corner  48 . The brightness of the left upper corner area  00  is measured to be 88.8, the brightness of the right upper corner area  06  is measured to be 79.3, the brightness of the left lower corner  42  area is measured to be 87.0, and the brightness of the right lower corner  48  area is measured to be 98.2. The unit of measurement for the brightness is lux. The flash device is located in the left lower corner  42  area. However, unlike the conventional flash shown in  FIG. 24 , the vignetting value can be improved by applying a translucent area in the disclosure. 
     According to an embodiment, when the translucent area is applied, it can be seen that the brightness value relative to the central portion is higher than that of the prior art and that the peripheral portions have uniform brightness therethrough. 
     According to an embodiment, the peripheral brightness may indicate a degree of relative brightness with respect to the central area  24 . An appropriate degree of a peripheral brightness value may be based on 60%, which may vary depending on configuration. 
     According to an embodiment, a vignetting value may indicate a relative value obtained by comparing the brightness of the left upper corner  00  and lower corner  42 , and right upper corner  06  and lower corner  48  areas with the brightness of the peripheral regions thereof. The peripheral regions may include up to 10% of the four corner areas. 
     According to an embodiment, the vignetting value of the left upper corner area is 0.933, the vignetting value of the right upper corner area is 0.933, the vignetting value of the left lower corner area is 0.932, and the vignetting value of the right lower corner area is 0.946. An appropriate reference of the vignetting value may be 0.9 to 1.03, which may vary depending on the configuration. It can be seen that, unlike the prior art, the vignetting values of the peripheral portions fall within 0.9 to 1.03 when the translucent area is applied, which is thus appropriate. 
     An electronic device  300  according to an embodiment may include a first camera module, and a flash module  340  disposed adjacent to the first camera module, wherein the flash module  340  may include an LED  740  configured to emit light, and an optical lens  710  disposed in the traveling direction of the light emitted from the LED  740 , wherein the optical lens  710  may include a first surface in the direction facing the LED and a second surface in the direction opposite the first surface, and wherein the second surface of the optical lens  710  may include a first translucent area  711  including a central area where the light emitted from the LED  740  is incident and a second translucent area  712  spaced apart from the first translucent area. 
     According to an embodiment, the second surface of the optical lens may further include a transparent area formed between the first translucent area and the second translucent area. 
     According to an embodiment, the first translucent area may be located at the central portion of the second surface, and the second translucent area may be located in the peripheral portion of the second surface. 
     According to an embodiment, the transmittance of the first translucent area and the transmittance of the second translucent area may be the same. 
     According to an embodiment, the transmittance of the transparent area may be higher than the transmittance of the first translucent area and the transmittance of the second translucent area. 
     According to an embodiment, the first surface of the optical lens may include a diffusion pattern area configured to diffuse the light emitted from the LED. 
     According to an embodiment, the second surface may be configured in a circular shape overlapping at least a central portion of the LED when viewed from the front of the electronic device. 
     According to an embodiment, the size and position of the first translucent area may correspond to the size and position of the LED. 
     According to an embodiment, the size and position of the second translucent area may be determined according to a variable K indicating a positional relationship between the first camera module and the LED. 
     According to an embodiment, the electronic device may further include a first point and a second point, wherein the first point and the second point may be positioned on the second surface, wherein the first point may be a point on the second surface closest to the center of the first camera module when viewed from the front of the electronic device, and wherein the second point may be a point on the second surface farthest from the center of the first camera module when viewed from the front of the electronic device. 
     According to an embodiment, the second translucent area may include a bow-shaped area formed between the first point and a third point, and a bow-shaped area formed between the second point and a fourth point, wherein the third point may be formed at a position spaced apart from the first point by a variable K in the direction of the center of the second surface, and wherein the fourth point may be formed at a position spaced apart from the second point by a variable K in the direction of the center of the second surface. 
     According to an embodiment, the size of the second translucent area may be determined according to the variable K, and the variable K may satisfy the following conditions (1), (2), (3) and (4), 
         X=h /tan(90− a/ 2)°  (1)
 
     (h: the distance between the center of the first camera module and a subject, a: the field of view (fov) of the first camera module) 
         Y=h /tan(90− b/ 2)°  (2)
 
     (h: the distance between the center of the first camera module and a subject, b: the field of view (fov) of the LED) 
         Z=X−Y+c    (3)
 
     (c: the distance between the first camera module and the LED) 
         K =( Z*d )/2 Y    (4)
 
     (d: the diameter of the LED). 
     According to an embodiment, the emission area of the LED may overlap the field of view (fov) of the first camera module. 
     According to an embodiment, the electronic device may further include a second camera module. 
     According to an embodiment, the size and position of the second translucent area may be determined according to a variable K 1  indicating a positional relationship between the first camera module and the LED, and a variable K 2  indicating a positional relationship between the second camera module and the LED. 
     According to an embodiment, the variable K 1  may satisfy the following conditions (1), (2), (3), and (4), and the variable K 2  may satisfy the following conditions (5), (6), (7), and (8), 
         X 1= h 1/tan(90− a 1/2)°  (1)
 
     (h1: the distance between the center of the first camera module and a subject, a1: the field of view (fov) of the first camera module) 
         Y 1= h 1/tan(90− b 1/2)°  (2)
 
     (h1: the distance between the center of the first camera module and a subject, b1: the field of view (fov) of the LED) 
         Z 1= X 1− Y 1+ c 1
 
     (c1: the distance between the first camera module and the LED) 
         K 1=( Z 1* d 1)/2 Y 1   (4)
 
     (d1: the diameter of the LED) 
         X 2= h 2/tan(90− a 2/2)°  (5)
 
     (h2: the distance between the center of the second camera module and a subject, a2: the field of view (fov) of the second camera module) 
         Y 2= h 2/tan(90− b 1/2)°  (6)
 
     (h2: the distance between the center of the second camera module and a subject, b1: the field of view (fov) of the LED) 
         Z 2= X 2− Y 2+ c 2   (7)
 
     (c2: the distance between the second camera module and the LED) 
         K 2=( Z 2* d 1)/2 Y 2   (8)
 
     (d1: the diameter of the LED) 
     According to an embodiment, the second surface may include a first point, a second point, a third point, and a fourth point, wherein the first point may be a point on the second surface closest to the center of the first camera module when viewed from the front of the electronic device, wherein the second point may be a point on the second surface farthest from the center of the first camera module when viewed from the front of the electronic device, wherein the third point may be a point on the second surface closest to the center of the second camera module when viewed from the front of the electronic device, and wherein the fourth point may be a point on the second surface farthest from the center of the second camera module when viewed from the front of the electronic device. 
     According to an embodiment, the second translucent area may include a first intermediary translucent area and a second intermediary translucent area, wherein the first intermediary translucent area includes a bow-shaped area formed between the first point and a fifth point, and a bow-shaped area formed between the second point and a sixth point, wherein the fifth point is formed at a position spaced apart from the first point by the variable K1 in a direction of a center of the second surface, and wherein the sixth point is formed at a position spaced apart from the second point by the variable K1 in the direction of the center of the second surface, wherein the second intermediary translucent area includes a bow-shaped area formed between the third point and a seventh point, and a bow-shaped area formed between the fourth point and a eighth point, wherein the seventh point is formed at a position spaced apart from the third point by the variable K2 in the direction of the center of the second surface, and wherein the eighth point is formed at a position spaced apart from the fourth point by the variable K2 in the direction of the center of the second surface, and wherein the second translucent area is only portions of the first intermediary translucent area and the second intermediary translucent area that overlap each other. 
     According to an embodiment, the first translucent area and the second translucent area may be implemented using at least one of methods of sand-blasting, acid-etching, and attaching a translucent film. 
     While the present disclosure has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the present disclosure as defined by the appended claims and their equivalents.