Patent Publication Number: US-2022229298-A1

Title: Wearable electronic device including small camera

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This application is a continuation application, claiming priority under § 365(c), of an International application No. PCT/KR2021/020343, filed on Dec. 31, 2021, which is based on and claims the benefit of a Korean patent application number 10-2021-0007054, filed on Jan. 18, 2021, in the Korean Intellectual Property Office, the disclosure of which is incorporated by reference herein in its entirety. 
    
    
     TECHNICAL FIELD 
     The disclosure relates to a wearable electronic device including a small camera configured to capture images of the user&#39;s eyes. 
     BACKGROUND ART 
     Augmented reality (AR) may refer to a technology for expressing elements which are generated through computer graphic processing, and which are added to the actual reality recognized by users. For example, the AR technology may be used to display an object existing in the reality together with an additional virtual object including information related to the object. 
     The AR may be implemented through various devices. The AR may be typically implemented through wearable electronic devices such as an eyeglass-type electronic device and a head mounted display (HMD). 
     In order to implemented AR by an eyeglass-type electronic device among the same, images may be displayed on the eyeglass lenses. Light may be projected onto the eyeglass lenses to display images on the lenses. For example, a projector having a very small size (for example, micro projector or pico projector) may be used. Examples of such projectors may include a laser scanning display (LSD), a digital micro-mirror display (DMD), and a liquid crystal on silicon (LCoS). In addition, a transparent display may be used to display images on lenses. 
     The above information is presented as background information only to assist with an understanding of the disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with regard to the disclosure. 
     DISCLOSURE OF INVENTION 
     Technical Problem 
     In order to implement AR, an electronic device may include multiple cameras. For example, cameras for capturing images of both eyes may be provided to track movement of the user&#39;s pupils, respectively. 
     The volume and weight of the electronic device may increase in proportion to the size of cameras included in the electronic device, thereby making it uncomfortable to wear the same. There may also a problem in that, if cameras for capturing images of the user&#39;s eyes have large sizes, the cameras may appear in the user&#39;s field of view. 
     Aspects of the disclosure are to address at least the above-mentioned problems and/or disadvantages and to provide at least the advantages described below. Accordingly, an aspect of the disclosure is to provide a wearable electronic device including a small camera capable of capturing images of the user&#39;s eyes without appearing in the user&#39;s field of view. 
     Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the presented embodiments. 
     Solution to Problem 
     In accordance with an aspect of the disclosure, an electronic device is provided. The electronic device includes a frame including a first region and a second region, a window member supported by the frame, a support member rotatably connected to the frame, a display module configured to project an image onto the window member, and a camera disposed in the second region of the frame to capture a portion of a user&#39;s eye, wherein the camera includes a substrate and an image sensor disposed on the substrate, and wherein an area of the substrate is equal to or smaller than an area of the image sensor. 
     In accordance with another aspect of the disclosure, a camera included in a head mounted electronic device is provided. The camera includes a substrate, an image sensor disposed on the substrate and electrically connected to the substrate, a protection glass disposed on the image sensor, a lens barrel disposed on the protection glass and having a plurality of lenses embedded therein, and a cover glass coupled to the lens barrel to protect the plurality of lenses included in the lens barrel, wherein an area of the substrate is less than or equal to an area of the image sensor. 
     Advantageous Effects of Invention 
     According to various embodiments disclosed herein, cameras may be made small such that the electronic device can become lightweight, and inclusion of the cameras in the user&#39;s field of view can be reduced, thereby improving usability of the electronic device. 
     Other aspects, advantages, and salient features of the disclosure will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses various embodiments of the disclosure. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       The above and other aspects, features, and advantages of certain embodiments of the disclosure will be more apparent from the following description taken in conjunction with the accompanying drawings, in which: 
         FIG. 1  is a block diagram of an electronic device in a network environment, according to an embodiment of the disclosure; 
         FIG. 2  is an overall configuration diagram of an electronic device including a plurality of cameras according to an embodiment of the disclosure; 
         FIG. 3A  illustrates an electronic device according to an embodiment of the disclosure; 
         FIG. 3B  is an exploded perspective view of an electronic device and a camera according to an embodiment of the disclosure; 
         FIG. 4A  illustrates a captured region by a camera according to an embodiment of the disclosure; 
         FIG. 4B  illustrates a captured space according to an embodiment of the disclosure; 
         FIG. 5  is an image captured by a camera according to an embodiment of the disclosure; 
         FIG. 6A  is a perspective view of a camera according to an embodiment of the disclosure; 
         FIG. 6B  is an exploded perspective view of the camera shown in  FIG. 6A  according to an embodiment of the disclosure; and 
         FIG. 6C  is a cross-sectional view of the camera shown in  FIG. 6A , taken along line A-A according to an embodiment of the disclosure. 
     
    
    
     Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures. 
     BEST MODE FOR CARRYING OUT THE INVENTION 
     The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of various embodiments of the disclosure as defined by the claims and their equivalents. It includes various specific details to assist in that understanding, but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the various embodiments described herein can be made without departing from the scope and spirit of the disclosure. In addition, descriptions of well-known functions and constructions may be omitted for clarity and conciseness. 
     The terms and words used in the following description and claims are not limited to the bibliographical meanings, but are merely used by the inventor to enable a clear and consistent understanding of the disclosure. Accordingly, it should be apparent to those skilled in the art that the following description of various embodiments of the disclosure is provided for illustration purposes only and not for the purpose of limiting the disclosure as defined by the appended claims and their equivalents. 
     It is to be understood that the singular form “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to “a component surface” includes reference to one or more of such surfaces. 
     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. 
       FIG. 1  is a block diagram illustrating an electronic device  101  in a network environment  100  according to an embodiment of the disclosure. 
     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 non-volatile memory  134  may include internal memory  136  and external memory  138 . 
     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 5G communication technology or IoT-related technology. 
       FIG. 2  is an overall configuration diagram of an electronic device (e.g., the electronic device  101  in  FIG. 1 ) including a plurality of cameras according to an embodiment of the disclosure. 
     Referring to  FIG. 2 , the electronic device  200  may be an electronic device  200  manufactured to be worn on a user&#39;s head part. For example, the electronic device  200  may be configured in the form of at least one of glasses, goggles, a helmet, or a hat, but is not limited thereto. According to an embodiment of the disclosure, the electronic device  200  may include a plurality of glass (e.g., the first glass  220  and/or the second glass  230 ) corresponding to both eyes (e.g., left eye and/or right eye) of a user, respectively. 
     The electronic device  200  may provide an image related to an augmented reality (AR) service to a user. The electronic device  200  may project or display a virtual object on first glass  220  and/or second glass  230  so that the user can see use at least one virtual object superimposed on reality perceived through the first glass  220  and/or the second glass  230  of the electronic device. 
     Referring to  FIG. 2 , the electronic device  200  may include a body part, a support part (e.g., the first support part  221  or the second support part  222 ), and a hinge part (e.g., the second hinge part  240 - 1  or the second hinge part  240 - 2 ). 
     The body part and the support part  221  or  222  may be operatively connected through the hinge part  240 - 1  or  240 - 2 . The body part may include a portion formed to be at least partially mounted on the user&#39;s nose. 
     The support part  221  or  222  may include a support member having a shape that can be mounted on the user&#39;s ear. The support part  221  or  222  may include a first support part  221  mounted on the left ear and/or a second support part  222  mounted on the right ear. 
     The first hinge part  240 - 1  may connect the body part  223  to the first support part  221  such that the first support part  221  is rotatable with respect to the body part  223 . The second hinge part  240 - 2  may connect the body part  223  to the second support part  222  such that the second support part  222  is rotatable with respect to the body part  223 . According to another embodiment of the disclosure, the hinge parts  240 - 1  and  240 - 2  of the electronic device  200  may be omitted. For example, the support parts  221  and  222  may be directly connected to the body part  223 . 
     The body part  223  may include at least one glass (e.g., the first glass  220  or the second glass  230 ), at least one display module  214 , at least one camera module (e.g., the front capturing camera module  213 ), an eye tracking camera module  212  (e.g., the first eye tracking camera module  212 - 1  or the second eye tracking camera module  212 - 2 ), a gesture camera module (e.g., the first gesture camera module  211 - 1  or the second gesture camera module  211 - 2 ), and at least one microphone  241 . 
     In the case of the electronic device  200  illustrated in  FIG. 2 , light generated by the display module  214 - 1  or  214 - 2  may be projected onto the glass  220  or  230  to display information thereon. For example, light generated by the first display module  214 - 1  may be projected onto the first glass  220 , and light generated by the second display module  214 - 2  may be projected onto the second glass  230 . Light capable of displaying a virtual object may be projected onto the glass  220  and  230  at least partially formed of a transparent material, and thus a user can recognize a reality in which the virtual object is superimposed. In this case, it may be understood that the display module  160  illustrated in  FIG. 1  may include at least one of the display module  214  and the glass  220  or  230  of the electronic device  200  illustrated in  FIG. 2 . However, the electronic device described in the disclosure is not limited to displaying information through the method described above. A display module that may be included in the electronic device may be changed to a display module including various types of information display methods. For example, when a display panel including a light emitting element made of a transparent material is embedded in the glass  220  or  230 , information can be displayed without a separate display module (e.g., the first display module  214 - 1  or the second display module  214 - 2 ). In this case, the display module  160  illustrated in  FIG. 1  may refer to the glass  220  or  230  and a display panel included in the glass. 
     The virtual object output through the display module  214  may include information related to an application program executed in the electronic device  200  and/or information related to an external object existing in a real space recognized by a user through the glass  220  or  230 . The external object may include an object existing in the real space. Hereinafter, the real space recognized by the user through the glass  220  or  230  will be referred to as a region of a user&#39;s field of view (FoV). For example, the electronic device  200  may identify an external object included in at least a part of a region determined as a user&#39;s field of view (FoV) in image information related to the real space obtained through a camera module (e.g., the capturing camera module  213 ) of the electronic device  200 . The electronic device  200  may output a virtual object related to the identified external object through the display module  214 . 
     The electronic device  200  may display a virtual object related to an augmented reality service together, based on image information related to a real space acquired through the capturing camera module  213  of the electronic device  200 . The electronic device  200  may display a virtual object, based on display modules (e.g., a first display module  214 - 1  corresponding to the left eye, and/or a second display module  214 - 2  corresponding to the right eye) disposed to correspond to both eyes of a user. The electronic device  200  may display the virtual object, based on preconfigured setting information (e.g., resolution, frame rate, brightness, and/or display region). 
     The glass  220  or  230  may include a light collecting lens (not shown) and/or a waveguide (e.g., the first waveguide and/or the second waveguide). For example, the first waveguide may be partially located on the first glass  220 , and the second waveguide may be partially located on the second glass  230 . Light emitted from the display module  214  may be incident onto one surface of the glass  220  or  230 . The light incident onto one surface of the glass  220  or  230  may be transmitted to a user through the respective first and second waveguides located in the glass  220  or  230 . The waveguide may be made of glass, plastic, or polymer, and may include a nanopattern formed on one internal or external surface thereof For example, the nanopattern may include a polygonal or curved grating structure. According to one embodiment, light incident onto one surface of the glass  220  or  230  may be propagated or reflected inside the waveguide by the nanopattern to be transmitted to a user. The waveguide may include at least one of at least one diffractive element (e.g., diffractive optical element (DOE), holographic optical element (HOE)) or a reflective element (e.g., reflective mirror). According to one embodiment, the waveguide may guide the light emitted from the display module  214  to the user&#39;s eye by using at least one diffractive element or a reflective element. 
     The electronic device  200  may include a capturing camera module  213  (e.g., red, green, and blue (RGB) camera module) for capturing an image corresponding to a user&#39;s field of view (FoV) and/or for measuring a distance to an object, an eye tracking camera module  212 - 1  or  212 - 2  for identifying a user&#39;s gaze direction, and/or a gesture camera module  211 - 1  or  211 - 2  for recognizing a certain space. For example, the capturing camera module  213  may capture an image in the front direction of the electronic device  200 , and the eye tracking camera module  212 - 1  or  212 - 2  may capture an image in a direction opposite to the capture direction of the capturing camera module  213 . For example, the first eye tracking camera module  212 - 1  may partially capture the user&#39;s left eye, and the second eye tracking camera module  212 - 2  may partially capture the user&#39;s right eye. The capturing camera module  213  may include a high-resolution camera module such as a high resolution (HR) camera module and/or a photo video (PV) camera module. The eye tracking camera modules  212 - 1  or  212 - 2  may detect the user&#39;s pupil and track a gaze direction. The tracked gaze direction may be used to move the center of a virtual image including a virtual object in response to the gaze direction. The gesture camera module  211 - 1  or  211 - 2  may detect a user gesture within a predetermined distance (e.g., predetermined space) and/or a predetermined space. The gesture camera module  211 - 1  or  211 - 2  may include a camera module including a global shutter (GS). For example, the gesture camera module  211 - 1  or  211 - 2  may be a camera module including GS for reducing a rolling shutter (RS) phenomenon so as to detect and track quick hand movements and/or minute movements by a finger or the like. 
     The electronic device  200  may sense an eye corresponding to a fixating eye and/or an auxiliary eye from among the left eye and/or the right eye by using at least one camera module  211 - 1 ,  211 - 2 ,  212 - 1 ,  212 - 2 , and/or  213 . For example, the electronic device  200  may sense an eye corresponding to a fixating eye and/or an auxiliary eye, based on a user&#39;s gaze direction with respect to an external object or a virtual object. 
     The number and position of at least one camera module (e.g., the capturing camera module  213 , the eye tracking camera module  212 - 1  or  212 - 2 , and/or the gesture camera module  211 - 1  or  211 - 2 ) included in the electronic device  200  illustrated in  FIG. 2  may not be limited. For example, the number and position of at least one camera module (e.g., the capturing camera module  213 , the eye tracking camera module  212 - 1  or  212 - 2 , and/or the gesture camera module  211 - 1  or  211 - 2 ) may vary based on a shape (e.g., shape or size) of the electronic device  200 . 
     The electronic device  200  may include at least one illumination LED  242  (e.g., a first illumination LED and a second illumination LED) to increase accuracy of the at least one camera module (e.g., the capturing camera module  213 , the eye tracking camera module  212 - 1  or  212 - 2 , and/or the gesture camera module  211 - 1  or  211 - 2 ). For example, the first illumination LED may be disposed on a portion corresponding to the user&#39;s left eye, and the second illumination LED may be disposed on a portion corresponding to the user&#39;s right eye. The illumination LED  242 - 1  or  242 - 2  may be used as auxiliary means for increasing accuracy when the user&#39;s pupil is captured using the eye tracking camera module  212 - 1  or  212 - 2  and may include an IR LED for generating light having infrared wavelength. In addition, the illumination LED  242  may be used as auxiliary means when a subject to be captured is not easily detected due to the dark environment or mixing and reflection by light from various light sources in a case where a user&#39;s gesture is captured using the gesture camera module  211 - 1  or  211 - 2 . 
     The electronic device  101  may include a microphone  241  (e.g., a first microphone or a second microphone) for receiving a user&#39;s voice and ambient sounds. For example, the microphone  241  may be a component included in the audio module  170  in  FIG. 1 . 
     The first support  221  and/or the second support  222  may include a printed circuit board (PCB) (e.g., the first printed circuit board  231 - 1  or the second printed circuit board  231 - 2 ), a speaker (e.g., the first speaker  232 - 1  or the second speaker  232 - 2 ), and/or a battery (e.g., the first battery  233 - 1  or the second battery  233 - 2 ). 
     According to various embodiments, the speaker  232 - 1  or  232 - 2  may include a first speaker  232 - 1  for transmitting an audio signal to the user&#39;s left ear and a second speaker  232 - 2  for transmitting an audio signal to the user&#39;s right ear. The speaker  232 - 1  or  232 - 2  may be a component included in the audio module  170  in  FIG. 1 . 
     The electronic device  200  may be provided with a plurality of batteries  233 - 1  and  233 - 2  and may supply power to the printed circuit boards  231 - 1  and  231 - 2  through a power management module (e.g., the power management module  188  in  FIG. 1 ). For example, the plurality of batteries  233 - 1  and  233 - 2  may be electrically connected to a power management module (e.g., the power management module  188  in  FIG. 1 ). 
     Although it has been described above that the electronic device  200  is a device that displays augmented reality, the electronic device  200  may be a device that displays virtual reality (VR). In this case, the glass  220  or  230  may be formed of an opaque material so that a user cannot recognize the real space through the glass  220  or  230 . In addition, the glass  230  may function as the display module  160 . For example, the glass  220  or  230  may include a display panel for displaying information. 
       FIG. 3A  illustrates an electronic device according to an embodiment of the disclosure.  FIG. 3B  is an exploded perspective view of an electronic device and a camera according to an embodiment of the disclosure. 
     Referring to  FIGS. 3A and 3B , the electronic device  300  may include a frame  310  (e.g., the body part  223  in  FIG. 2 ), a window member  330  (e.g., the first glass  220  or the second glass  230  in  FIG. 2 ), a support member  320  (e.g., the first support part  221  or the second support part  222  of  FIG. 2 ), a display module (not shown) (e.g., the display module  160  in  FIG. 1 ), a camera  340  (e.g., the eye tracking camera  212  in  FIG. 2 ), an illumination part (not shown) (e.g., the illumination LED  242  in  FIG. 2 ), and a processor (not shown) (e.g., the processor  120  in  FIG. 1 ). The window member  330 , the support member  320 , the display module, the camera  340 , and the illumination part may be provided as pair, respectively, to correspond to the user&#39;s left and right eye. For example, the window member  330  may include a first window member  330 - 1  and a second window member  330 - 2 , the support member  320  may include the first support member  320 - 1  and a second support member  320 - 2 , and the camera  340  may include a first camera  340 - 1  and a second camera  340 - 2 . In some cases, specific components among the above-described components may be different from the components corresponding to the left eye and the components corresponding to the right eye. 
     In the following drawings, for convenience of explanation, the electronic device  300  is illustrated as an electronic device in the form of glasses, but the technical idea disclosed herein may be applied to an electronic device including a head mounted display (HMD) including a display and having various types that can be mounted on a user&#39;s head part. 
     The frame  310  may support the window member  330 . The frame  310  may be formed of a synthetic resin material. The window member  330  is fitted into an opening formed through the frame  310  so that the frame  310  can support the window member  330 . 
     The support member  320  may be rotatably connected to the frame  310 . The support member  320  may include a first support member  320 - 1  and a second support member  320 - 2 . The first support member  320 - 1  may be connected to the frame  310  at the left side (e.g., −X direction in  FIG. 3A ) with respect to the frame  310 , and the second support member  320 - 2  may be connected to the frame  310  at the right side (e.g., +X direction in  FIG. 3A ) with respect to the frame  310 . In one embodiment, the support member  320  may be fixedly installed on the frame. For example, the first support member  320 - 1  connected to the left side of the frame  310  and the second support member  320 - 2  connected to the right side of the frame  310  may be connected to each other. The support member connected to the opposite sides of the frame  310  may form a ring shape and may be worn by being fitted around the user&#39;s head. In addition, the support member  320  may be deformed into various shapes in which the electronic device  300  can be worn on the user&#39;s face. 
     According to the embodiment shown in  FIG. 3A , the support member  320  may be formed to be hung over the user&#39;s ear. The electronic device  300  may be worn on the user&#39;s face by hanging the support member  320  connected to the frame  310  over the user&#39;s ear. The support member  320  may rotate with respect to the frame  310 . The support member  320  may be rotated in a direction in which the same approaches the frame  310 , to reduce the volume of the electronic device  300 . 
     The window member  330  may include a first window member  330 - 1  corresponding to the user&#39;s left eye, and a second window member  330 - 2  corresponding to the user&#39;s right eye. The window member  330  may be supported by the frame  310 . For example, the window member  330  may be fitted into the opening formed through the frame  310 . An AR image emitted from the display module may be projected onto the window member  330 . A waveguide (e.g., the first waveguide and/or the second waveguide) may be formed in at least a partial region of the window member  330 . The waveguide may guide the AR image emitted from the display module to the user&#39;s eye. For a detailed description of the waveguide, reference is made to the description related to the first glass  220  and the second glass  230  in  FIG. 2 . 
     The display module may output the AR image generated by the processor. When the display module generates an AR image and projects the same onto the window member  330 , AR may be implemented by combining the visible light (L) incident from the front (e.g., −Y direction in  FIG. 3B ) through the window member  330  with an object included in the AR image. The display module may be a very small a projector (e.g., micro projector, Pico projector). For example, the display module may be a laser scanning display (LSD), a digital micro-mirror display (DMD), and a liquid crystal on silicon (LCoS). In addition, the display module may be a transparent display. In this case, the light emitting element included in the display module may be directly disposed in the window member  330 . In addition, the display module may be various display devices for implementing AR. 
     The camera  340  may include a first camera  340 - 1  corresponding to the user&#39;s left eye, and a second camera  340 - 2  corresponding to the user&#39;s right eye. The camera  340  may be a camera  340  for capturing the user&#39;s eyes. The camera  340  may be, for example, the eye tracking camera  212 - 1  or  212 - 2  in  FIG. 2 . The camera  340  may capture the user&#39;s eye in real time and thus be used to identify the movement of the user&#39;s eye. 
     Referring to  FIG. 3A , when the frame  310  is divided into a first region  310 A and a second region  310 B, the camera  340  may be disposed in the second region  310 B of the frame  310 . The second region  310 B of the frame  310  may be a region adjacent to the user&#39;s nose while the electronic device  300  is worn by the user. For example, as shown in  FIG. 3A , a region extending in a first direction (e.g., −Z direction in  FIG. 3A ), based on an imaginary line (L) crossing the frame  310 , may be understood as the second region  310 B. Alternatively, the second region  310 B may be understood as a region located under a user&#39;s gaze when the user looks straight ahead. The camera  340  disposed in the second region  310 B of the frame  310  may capture the user&#39;s eye from the underside of the user&#39;s eye. The first region  310 A of the frame  310  may refer to the remaining region of the frame  310  excluding the second region  310 B. For example, as shown in  FIG. 3A , a region extending in the second direction (e.g., +Z direction in  FIG. 3A ), based on an imaginary line (L) crossing the frame  310  may be understood as the first region  310 A. 
     The camera  340  may be inserted into the camera hole  351  formed through a support  350  disposed in the second region  310 B of the frame  310 . The pair of supports  350  may be formed to be in contact with the user&#39;s nose while the electronic device  300  is worn by the user. The pair of supports  350  may include a first support  350 - 1  located on the left side (e.g., −X direction in  FIG. 3A ) with respect to the center of the frame  310 , and a second support  350 - 2  located on the right side (e.g., +X direction in  FIG. 3A ) with respect to the center of the frame  310 . The supports  350  may allow the frame  310  to be supported by the user&#39;s nose. According to an embodiment of the disclosure, the supports  350  may be integrally formed with the frame  310  as shown in  FIG. 3A . According to another embodiment, the supports  350  may be formed separately from the frame  310  and be coupled to the frame  310 . 
     The camera hole  351  may be a hole formed through each of the supports  350 . The camera hole  351  may include a first camera hole  351 - 1  formed through the first support  350 - 1 , and a second camera hole  351 - 2  formed through the second support  350 - 2 . The camera hole  351  may be formed to be inclined at a predetermined angle with respect to the frame  310  such that the camera  340  disposed in the second region  310 B of the frame  310  can face the user&#39;s eye. When the camera  340  is inserted into the camera hole  351  formed to be inclined with respect to the frame  310 , the camera  340  can face the user&#39;s eye. 
     The camera  340  may be inserted into the camera hole  351  formed through the support  350  from the front (e.g., −Y direction in  FIG. 3B ) of the electronic device. A first camera  340 - 1  may be inserted into the first camera hole  351 - 1 , and a second camera  340 - 2  may be inserted into the second camera hole  351 - 2 . The first camera hole  351 - 1  may be formed through the first support  350 - 1  or a portion of the frame  310  adjacent to the first support  350 - 1 . The second camera hole  351 - 2  may be formed through the second support  350 - 2  or a portion of the frame  310  adjacent to the second support  350 - 2 . 
     The electronic device  300  may include a component for fixing the camera  340  so that the camera  340  is prevented from moving in the camera hole  351 . According to the embodiment shown in  FIG. 3B , the camera cover and the buffer member may be inserted into the camera hole  351  together with the camera  340 . The camera cover  352  may include a first camera cover  352 - 1  inserted into the first camera hole  351 - 1 , and a second camera cover  352 - 2  inserted into the second camera hole  351 - 2 . The buffer member may include a first buffer member  353 - 1  inserted into the first camera hole  351 - 1 , and a second buffer member  353 - 3  inserted into the second camera hole  351 - 2 . 
     Referring to  FIG. 3B , the camera cover  352 , the camera  340 , and the buffer member may be inserted into the camera hole  351  in that order. According to another embodiment of the disclosure, the camera cover, the buffer member, and the camera  340  may be inserted into the camera hole  351  in that order, and a plurality of buffer members may be used such that the camera cover, the buffer member, the camera  340 , and the buffer member are inserted into the camera hole  351  in that order. 
     The camera covers  352 - 1  and  352 - 2  may have a shape naturally connected to the external shape of the support  350  or the external shape of the frame  310  while being inserted into the camera hole  351 . The camera covers  352 - 1  and  352 - 2  may have at least a portion (particularly, a portion viewed from the outside while being inserted into the camera hole  351 ) formed of the same material as the support  350  and/or the frame  310 . For this reason, when the camera covers  352 - 1  and  352 - 2  are inserted into the camera hole  351 , no difference may be felt between a portion through which the camera hole  351  is formed and the remaining portions. 
     The buffer member may be formed of an elastically deformable material. When a pressure is applied to the camera cover  352  and the camera  340  while the camera cover is inserted into the camera hole  351 , the buffer member may be partially deformed and support the camera  340  disposed in the camera hole  351 . 
     In the case of the camera  340  described below, a separate housing for protecting the main components of the camera  340  (e.g., image sensor (e.g., the image sensor  342  in  FIG. 6A ) and a substrate (e.g., the substrate  341  in  FIG. 6A )) may not be provided to implement the small camera  340 . When the camera  340  is inserted into the camera hole  351 , the camera hole  351  may serve as a housing for protecting the main components of the camera  340 . For example, the camera hole  351  in which the camera  340  is located corresponds to the shape of the camera  340  and, the camera hole  351  may become narrower when viewed from the front (e.g., −Y direction in  FIG. 3B ) of the electronic device. 
       FIG. 4A  illustrates a captured region by a camera according to an embodiment of the disclosure.  FIG. 4B  illustrates a captured space according to an embodiment of the disclosure.  FIG. 5  is an image captured by a camera according to an embodiment of the disclosure. 
     Referring to  FIGS. 4A, 4B, and 5 , the camera  340  may capture the user&#39;s eye. Referring to  FIG. 4A , the user&#39;s eye may be included in a captured region  401  by the camera  340 . The captured region  401  by the camera  340  may be determined by factors, such as a focal length of the camera  340 , an angle of view, and/or a distance between the eye and the camera  340 . In the camera  340 , a focal length, an angle of view, and a distance to the eye may be adjusted such that the captured region  401  including the user&#39;s eye is formed. 
     The camera  340  may be disposed in a second region (e.g., the second region  310 B in  FIG. 3A ) of the frame  310 . The second region of the frame  310  may be a portion adjacent to the user&#39;s nose. The camera  340  disposed in the second region may capture the user&#39;s eye from the underside of the eye. When the camera  340  is disposed in the second region  310 B of the frame  310 , no object (e.g., the user&#39;s eyebrows or eyelashes) that may cause interfere exists in the captured space  402  (region between the captured region  401  and the camera  340 ) of the camera  340 , and thus the user&#39;s eye can be effectively captured. In addition, when the camera  340  is disposed in the second region of the frame  310 , a phenomenon in which the camera  340  is included in the user&#39;s field of view can be reduced. 
     The image information obtained through the camera  340  may be used to track the movement of the user&#39;s pupil  501 . For example, referring to  FIG. 5 , an illumination point  502  projected onto the user&#39;s eye may be used. According to one embodiment, the illumination point  502  projected onto the user&#39;s eye may be an infrared wavelength IR LED emitted by the illumination part (e.g., the illumination LED  242  in  FIG. 2 ) toward the user&#39;s eye. The movement of the user&#39;s pupil  501  may be tracked through the relative distance between the pupil  501  and the illumination point  502  projected onto the user&#39;s eye from the illumination part. The illumination point  502  may refer to a point at which the strongest light intensity point in the illumination part is projected onto the user&#39;s eye. The movement of the pupil  501  may be tracked using a change in the relative distances between the pupil  501  and the plurality of illumination points  502 . 
     The plurality of illumination parts (e.g., the illumination LED  242   FIG. 2 ) may be arranged at a predetermined interval along the inner periphery of the frame  310 . The number and arrangement of the illumination parts may be variously changed according to the distance between the camera  340  and the user&#39;s eye and the positional relationship between the illumination part and the camera  340 . For example, the plurality of illumination parts (e.g., the illumination LED  242  in  FIG. 2 ) may be arranged in consideration of the incident position and angle at which light emitted from the illumination part is reflected from the user&#39;s eye, and the reflected light is incident to the camera  340 . According to an embodiment of the disclosure, only specific illumination parts of the plurality of illumination parts may be activated according to surrounding situations (e.g., ambient light or wearing state of the electronic device). The number of illumination points  502  required for tracking the pupil may be different according to surrounding situations. For example, in a situation in which ambient light is introduced weakly, the required number of illumination points  502  may be reduced compared to a situation in which ambient light is strongly introduced. In this case, power consumption due to driving of the illumination parts can be reduced by activating only specific illumination parts. The processor may perform control such that the plurality of illumination parts are activated based on a specified pattern or a specified order. 
     The processor (e.g., the processor  120  in  FIG. 1 ) may acquire a user&#39;s gaze direction by tracking the movement of the user&#39;s pupil  501 . The processor may control the display module (e.g., the display module  160  in  FIG. 1 ) by using the gaze direction. 
     For example, the processor may control the display module such that the user&#39;s gaze direction matches the center of the image projected onto the window member (e.g., the window member  330  in  FIG. 3A ). The processor may control the display module such that the resolution of the AR image corresponding to a predetermined region about the user&#39;s gaze direction is adjusted to be higher than those of the remaining regions. The processor may set a predetermined region as a region of interest, based on the user&#39;s gaze direction and may generate an AR image in which an AR object is located in the region. In addition, the processor may use image information acquired through the camera to variously control the display module or to generate an AR image. 
     The processor (e.g., the processor  120  in  FIG. 1 ) may identify an input based on a user&#39;s gaze by tracking the movement of the user&#39;s pupil  501 . For example, when a virtual object is displayed through the display module (e.g., the display module  160  in  FIG. 1 ) and a user&#39;s gaze is directed toward the virtual object for a specified time or longer, the processor may determine that the user is interested in the virtual object and may provide additional information on the virtual object. 
       FIG. 6A  is a perspective view of a camera according to an embodiment of the disclosure.  FIG. 6B  is an exploded perspective view of the camera shown in  FIG. 6A  according to an embodiment of the disclosure.  FIG. 6C  is a cross-sectional view of the camera shown in  FIG. 6A , taken along line A-A according to an embodiment of the disclosure. 
     Referring to  FIGS. 6A and 6B , the camera  340  may include a substrate  341 , an image sensor  342 , a first adhesive layer  343 , protection glass  344 , and a second adhesive layer  345 , a lens barrel  346  including a plurality of lenses  346 - 1 , and a cover glass  347 . The above-mentioned components of the camera  340  is merely an example, and the components included in the camera  340  disclosed herein are not limited to the above components. 
     The substrate  341  may be, for example, a printed circuit board (PCB). The substrate  341  may be electrically connected to a substrate on which a processor is disposed, so as to transmit image information generated by the image sensor  342  of the camera  340  to the processor (e.g., the processor  120  in  FIG. 1 ) of the electronic device (e.g., the electronic device  101  in  FIG. 1 ). For example, the substrate  341  of the camera  340  may be electrically connected to a substrate on which a processor is disposed, through a flexible printed circuit board (FPCB). The processor may be disposed on a printed circuit board (e.g., the first printed circuit board  231 - 1  and the second printed circuit board  232 - 2  in  FIG. 2 ) embedded in a support member (e.g., the first support part  221  and second support part  222  in  FIG. 2 ). A first connection member (e.g., flexible printed circuit board) (not shown) disposed inside the frame  310  and extending up to the camera hole  351  into which the camera  340  is inserted may be connected to a second connection member (e.g., flexible printed circuit board) (not shown) connected to the printed circuit board embedded in the support member  320 . The camera  351  inserted into the camera hole  351  may be electrically connected to the first connection member, and the first connection member may be connected to the second connection member, whereby the camera  340  may be electrically connected to the printed circuit board on which the processor is disposed. In one embodiment, a solder ball may be disposed on the rear surface of the substrate  341  of the camera  340 , and the solder ball may be in contact with the first connection member, whereby the substrate  341  and the first connection member may be electrically connected to each other. The printed circuit board on which the processor is disposed and the camera  340  may be electrically connected to each other through a transparent electrode positioned on glass (e.g., the first glass  220  or the second glass  230  in  FIG. 2 ). 
     The image sensor  342  may include a photoelectric element configured to convert light into an electrical signal. For example, the photoelectric element included in the image sensor  342  may be a charged coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS). The image sensor  342  may be disposed on the substrate  341  to be electrically connected to the substrate  341 . Referring to  FIG. 6C , a solder ball  342 - 1  may be formed on the surface of the image sensor  342  facing the substrate  341 . The image sensor  342  and the substrate  341  may be coupled to each other by solder bonding through the solder ball  342 - 1  formed on the image sensor  342 , whereby the image sensor  342  and the substrate  341  may be electrically connected to each other. As described above, the volume of the camera  340  may be reduced by coupling the image sensor  342  and the substrate  341  to each other by the solder bonding through the solder ball  342 - 1 , compared to coupling the same through wire bonding of the related art. In the case of wire bonding, a space for wire bonding is required on the outer periphery of the image sensor  342 . Accordingly, the overall volume of the camera  340  may increase due to the area of the substrate  341  which needs to be larger than the area of the image sensor  342 . As for the camera  340  disclosed herein, the substrate  341  and the image sensor  342  may have substantially the same area because the image sensor  342  and the substrate  341  are coupled through the solder ball  342 - 1 . In one embodiment, the area of the substrate  341  may be less than or equal to than the area of the image sensor  342 . Since the area of the substrate  341  can be reduced compared to that of a substrate of the related art, the overall volume of the camera  340  can also be reduced. Since the camera  340  disclosed herein may be inserted into the camera hole  351  and may be protected by the frame  310  or the support  350  of the electronic device  300 , a separate housing for protecting the camera  340  may not be required. Accordingly, an additional space for disposing the housing around the substrate  341  may not be required. 
     The protection glass  344  may be disposed on the image sensor  342 . The protection glass  344  may be disposed on the image sensor  342  to protect the image sensor  342 . The image sensor  342  and the protection glass  344  may be coupled to each other by the first adhesive layer  343  disposed along the edge of the image sensor  342 . In the case of the image sensor  342  employing wire bonding of the related art, the edge portion of the image sensor  342  is used as a portion to which a wire is coupled. Since the image sensor  342  disclosed herein is coupled to the substrate  341  through the solder ball  342 - 1 , the first adhesive layer  343  may be disposed around the edge of the image sensor  342 . As described above, the image sensor  342  and the protection glass  344  are coupled through the first adhesive layer  343  disposed around the image sensor  342 , thereby reducing the overall volume of the camera  340 . 
     The lens barrel  346  including the plurality of lenses  346 - 1  may be disposed on the protection glass  344 . The protection glass  344  and the lens barrel  346  may be coupled to each other by the second adhesive layer  345  disposed along the edge of the protection glass  344 . In this case, the protection glass  344  and the lens barrel  346  may be spaced apart from each other by a predetermined interval. The interval may be utilized to compensate for the difference between the cameras  340  in the manufacturing process of the camera  340  so that the camera  340  can generate image information having a specified quality at the time of assembling the camera  340 . Such a difference may be caused by various factors (e.g., assembly allowance, specification error of the image sensor  342 , etc.). For example, the difference may occur due to minute changes in optical design factors such as thickness, interval, and eccentricity of the lenses  346 - 1  disposed in the lens barrel  346 . The difference needs to be compensated to allow the camera  340  disclosed herein, which is disposed in the electronic device, to capture the user&#39;s eyes with a specified quality. The difference between the cameras  340  may be compensated during the process of assembling the camera  340  by forming an interval between the protection glass  344  and the lens barrel  346  and applying different interval for each camera  340  at the time of assembling the camera  340 . 
     The second adhesive layer  345  disposed between the protection glass  344  and the lens barrel  346  may be formed of an optical or thermosetting material. The second adhesive layer  345  may have a certain level of fluidity before being cured. A position of the lens barrel  346  with respect to the protection glass  344  may be adjusted (e.g., adjusted by X-axis, Y-axis, or Z-axis rotation in  FIG. 6B ) to compensate for the error of the camera  340 . When the position of the lens barrel  346  with respect to the protection glass  344  is aligned, the second adhesive layer  345  may be cured using light or heat. Also, the interval between the protection glass  344  and the lens barrel  346  may be used for optical axis alignment. In order to match the optical axes of the image sensor  342  and the plurality of lenses  346 - 1  included in the lens barrel  346 , the lens barrel  346  may be disposed at a predetermined angle with respect to the protection glass  344 . 
     The distance between the lens barrel  346  and the image sensor  342  may be adjusted such that an optical total track length (OTTL)/back focal length (BFL) is about 0.3 to about 0.5. The OTTL may refer to distance D 2  from the focal point to the lens  346 - 1 A that is farthest from the image sensor  342  among the lenses  346 - 1  included in the lens barrel  346 . The BFL may refer to distance D 1  from the focal point to the lens  346 - 1 B that is closest to the focal point, among the lenses  346 - 1  included in the lens barrel  346 . The minimum focal length of the camera  340  may be equal to or smaller than the distance between the user&#39;s eye and the camera  340  disposed in the electronic device by adjusting the OTTL/BFL as described above. The distance between the lens barrel  346  and the protection glass  344  may be adjusted such that the assembled camera  340  has an OTTL/BFL of about 0.3 to about 0.5. 
     According to the embodiment shown in  FIG. 6A , the lens barrel  346  may be formed in a shape that decreases in diameter as the lens barrel is farther away from the image sensor  342 . The plurality of lenses embedded in the lens barrel  346  may be configured such that a lens thereof (e.g., the lens  346 - 1 A) that is far from the image sensor  342  has a diameter smaller than that of a lens thereof (e.g., the lens  346 - 1 B) that is close to the image sensor  342 . The inside of the camera hole (e.g., the camera holes  351 - 1  or  351 - 2  in  FIG. 3B ) into which the camera  340  is inserted may formed in a shape corresponding to the barrel  346  such that the camera  340  can be stably seated in the camera hole. For example, when the lens barrel  346  is formed to have a reduced diameter as shown in  FIG. 6A , the inner diameter of the camera hole facing the lens barrel  346  may also be formed to decrease in the direction in which the camera enters. 
     The cover glass  347  may be coupled to the lens barrel  346 . The cover glass  347  may be attached to the outer surface of the lens barrel  346  by an adhesive method. For example, the cover glass  347  may be attached to the lens barrel  346  through a third adhesive layer  348 . In one embodiment, a hole (not shown) through which the cover glass  347  can be inserted may be formed in the lens barrel  346 . The cover glass  347  may protect the plurality of lenses  346 - 1  included in the lens barrel  346 . As described above, the overall volume of the camera  340  may be reduced by coupling the cover glass  347  directly to the lens barrel  346  other than a separate housing. In addition, since the cover glass  347  protects the camera  340 , a separate component for protecting the camera  340  may not be required in the camera hole  351  into which the camera  340  is inserted. 
     According to an embodiment of the disclosure, the first adhesive layer  343  between the image sensor  342  and the protection glass  344  and/or the second adhesive layer  345  between the protection glass  344  and the lens barrel  346  may be omitted. For example, when the error in the camera  340  is small, the first adhesive layer  343  and/or the second adhesive layer  345  may be omitted and the coupling may be achieved by an adhesive. 
     The overall volume of the camera  340  included in the electronic device disclosed herein may be reduced compared to a camera of the related art. Accordingly, the weight of the electronic device can be reduced, and the phenomenon in which the camera  340  is included in the user&#39;s field of view can be reduced, thereby increasing the usability of the electronic device. 
     An electronic device (e.g., the electronic device  101  in  FIG. 1  and the electronic device  200  in  FIG. 2 ) according to various embodiments disclosed herein may include a frame (e.g., the frame  310  in  FIG. 3A ) including a first region (e.g., the first region  310 A in  FIG. 3A ) and a second region (e.g., the second region  310 B in  FIG. 3A ), a window member (e.g., the window member  330  in  FIG. 3A ) supported by the frame, a support member (e.g., the support member  320  in  FIG. 3A ) rotatably connected to the frame, a display module (e.g., the display module  160  in  FIG. 1  and the display module  214  in  FIG. 2 ) configured to project an image onto the window member, and a camera (e.g., the camera  340  in  FIG. 3A ) disposed in the second region of the frame to capture the eye part of a user. The camera may include a substrate (e.g., the substrate  341  in  FIG. 6B ), and an image sensor (e.g., the image sensor  342  in  FIG. 6B ) disposed on the substrate, and an area of the substrate may be equal to or smaller than an area of the image sensor. 
     When the frame is divided into two regions, the second region of the frame may be a region adjacent to the user&#39;s nose while the electronic device is worn by the user. 
     The camera may be disposed on a support (e.g., the support  350  in  FIG. 3A ) formed in the second region of the frame such that the camera is in contact with the user&#39;s nose and the frame is supported by the user&#39;s nose while the electronic device is worn by the user. 
     The camera may be inserted into a camera hole (e.g., the camera hole  351  in  FIG. 3B ) formed through the support. 
     The camera hole may be formed to be inclined at a predetermined angle with respect to the frame such that the camera inserted into the camera hole can face the eye part of a user. 
     The electronic device may further include a plurality of illumination parts (e.g., the illumination LED  242 - 1  or  242 - 2  in  FIG. 2 ) arranged on the frame to be spaced apart from each other at a predetermined interval such that the user&#39;s eye is irradiated with infrared light. 
     The camera may further include a protection glass (e.g., the protection glass  344  in  FIG. 6B ) disposed on the image sensor, a lens barrel (e.g., the lens barrel  346  in  FIG. 6B ) disposed on the protection glass and having a plurality of lenses (e.g., the plurality of lenses  346 - 1  in  FIG. 6B ) embedded therein, and a cover glass (e.g., the cover glass  347  in  FIG. 6B ) coupled to the lens barrel to protect the plurality of lenses included in the lens barrel. 
     The image sensor and the protection glass of the camera may be coupled to each other by a first adhesive layer (e.g., the first adhesive layer  343  in  FIG. 6B ) disposed along the edge of the image sensor. 
     The image sensor of the camera may be electrically connected to the substrate by a solder ball formed on a surface of the image sensor facing the substrate. 
     The lens barrel of the camera may be formed to have a diameter inversely proportional to a distance from the image sensor. 
     The camera may be inserted into the camera hole formed in the second region of the frame, and the camera hole may be formed to have an inner diameter decreasing in a direction in which the camera enters, to correspond to the lens barrel of the camera. 
     The protection glass and the lens barrel of the camera may be mutually coupled to be spaced apart from each other at a predetermined interval by a second adhesive layer (e.g., the second adhesive layer  345  in  FIG. 6B ) disposed along the edge of the protection glass. 
     The camera may be configured such that a ratio of a back focal length (BFL) from the image sensor to a lens, which is closest to the image sensor among the plurality of lenses  346 - 1  included in the lens barrel, to an optical total track length (OTTL) from the image sensor to a lens, which is farthest from the image sensor among the plurality of lenses included in the lens barrel, is 0.3 to 0.5. 
     A camera (e.g., the camera  340  in  FIG. 3A ) included in a head mounted electronic device according to various embodiments disclosed herein may include a substrate (e.g., the substrate  341  in  FIG. 6B ), an image sensor (e.g., the image sensor  342  in  FIG. 6B ) disposed on the substrate and electrically connected to the substrate, a protection glass (e.g., the protection glass  344  in  FIG. 6B ) disposed on the image sensor, a lens barrel (e.g., the lens barrel  346  in  FIG. 6B ) disposed on the protection glass and having a plurality of lenses (e.g., the plurality of lenses  346 - 1  in  FIG. 6B ) embedded therein, and a cover glass (e.g., the cover glass  347  in  FIG. 6B ) coupled to the lens barrel to protect the plurality of lenses included in the lens barrel. An area of the substrate may be smaller than or equal to an area of the image sensor. 
     The image sensor and the protection glass may be coupled to each other by a first adhesive layer (e.g., the first adhesive layer  343  in  FIG. 6B ) disposed along the edge of the image sensor. 
     The image sensor may be electrically connected to the substrate by a solder ball formed on a surface of the image sensor facing the substrate. 
     The lens barrel may be formed to have a diameter inversely proportional to a distance from the image sensor. 
     The plurality of lenses embedded in the lens barrel may be configured such that the lenses have a diameter decreasing as the lenses are farther away from the image sensor  342 . 
     The protection glass and the lens barrel of the camera may be mutually coupled to be spaced apart from each other at a predetermined interval by a second adhesive layer (e.g., the second adhesive layer  345  in  FIG. 6B ) disposed along the edge of the protection glass. 
     A ratio of a back focal length (BFL) from the image sensor to a lens, which is closest to the image sensor among the plurality of lenses included in the lens barrel, to an optical total track length (OTTL) from the image sensor to a lens, which is farthest from the image sensor among the plurality of lenses included in the lens barrel, may be 0.3 to 0.5. 
     While the 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 spirit and scope of the disclosure as defined by the appended claims and their equivalents.