WO2017183796A1

WO2017183796A1 - Electronic device having infrared optical device and method for controlling infrared optical device

Info

Publication number: WO2017183796A1
Application number: PCT/KR2016/014974
Authority: WO
Inventors: 김종태; 김영수
Original assignee: (주)파트론
Priority date: 2016-04-18
Filing date: 2016-12-21
Publication date: 2017-10-26
Also published as: KR101790518B1

Abstract

Disclosed is an electronic device having an infrared optical device. An electronic device having an infrared optical device, according to the present invention, comprises: an infrared ray emitting unit for emitting light in an infrared band; an infrared ray receiving unit for detecting light in the wavelength band of the light emitted by means of the infrared ray emitting unit; a signal processing unit for processing a signal generated by means of the infrared ray receiving unit; an image sensor for detecting light in a visible band; a camera module comprising a lens and a focusing module which moves the lens in an optical axis direction and focuses same; and a control unit for controlling the infrared ray emitting unit, infrared ray receiving unit and camera module in accordance with a selected operation mode, wherein, if a selected operation mode is an iris recognition mode, the infrared ray emitting unit irradiates light on the iris and the infrared ray receiving unit detects the light reflected off the iris and captures an image of the iris and, if a selected operation mode is an infrared focusing mode, the infrared ray emitting unit irradiates light on an object, the infrared ray receiving unit detects light reflected off the object, the signal processing unit calculates the location of the object and the focusing module operates in accordance with the calculation result.

Description

Control method of electronic device and infrared optical device equipped with infrared optical device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device equipped with an infrared optical device and a method for controlling the infrared optical device, and more particularly, to an electronic device equipped with an infrared optical device used for iris recognition and a control method thereof.

Recent smart devices, including smart phones, tablet computers and wearable devices, are being used to perform functions that contain more sensitive information or require security. As a result, higher levels of security are being employed in these smart devices.

In the past, security means using a password or a pattern of a specific shape have been used. Recently, security means using fingerprint recognition have been widely used. Security means using a biometric signal of the user, such as a fingerprint has the advantage that the security is higher than that of the conventional.

Security measures using iris recognition have more and more complex patterns than fingerprints. In addition, the pattern of the iris is difficult to be forged than the pattern of the fingerprint has the advantage of high security. In addition, fingerprint recognition is a method of contacting the surface of the fingerprint directly to the sensor surface, so it is not possible to recognize when wearing gloves or foreign material on the fingerprint, but iris recognition is a non-contact method of wearing glasses or contact lenses There is an advantage that can be recognized in.

In order to recognize the iris, an infrared light emitting unit and an infrared light receiving unit should be mounted. However, mounting such a separate device for iris recognition is a factor in raising the price, and it is a factor that hinders the reduction of light and small size of smart devices. Thus, security means using iris recognition have not been widely used.

An object of the present invention is to provide an electronic device equipped with an infrared optical device capable of assisting a focusing function of a camera module in a low light environment by using an infrared optical device for iris recognition.

Another object of the present invention is to provide an electronic device equipped with an infrared optical device capable of minimizing power consumption while assisting a focusing function of a camera module using an infrared optical device for iris recognition.

An electronic device equipped with an infrared optical device of the present invention for solving the above problems is an infrared light emitting unit for emitting light in the infrared band, an infrared light receiving unit for detecting light in the wavelength band of the light emitted by the infrared light emitting unit, the infrared A camera module including a signal processing unit for processing a signal generated by a light receiving unit, an image sensor for detecting light in a visible light band, a lens, and a focusing module for moving the lens in an optical axis direction and focusing the infrared light according to a selected operation mode And a controller for controlling the infrared light receiving unit and the camera module. When the selected operation mode is an iris recognition mode, the infrared light emitting unit irradiates light to the iris, and the infrared light receiving unit detects light reflected from the iris. The image of the iris is taken and the selected operating mode is infrared focused. In this case, the infrared light emitting unit irradiates light onto the subject, the infrared light receiving unit detects the light reflected from the subject, and the signal processing unit calculates the position of the subject and according to the calculated result, the focusing module This works.

In addition, the control method of the infrared optical device of the present invention for solving the above problems, the operation mode is selected by the control unit, if the selected operation mode is the iris recognition mode, the infrared light emitting unit irradiates the iris of the infrared band light, The infrared light receiver detects the light reflected by the iris to take an image of the iris, and when the selected operation mode is an infrared focusing mode, the infrared light emitter irradiates an infrared band of light onto the subject, and the infrared light receiver emits the subject. Sensing the light reflected by the signal processing unit, the signal processing unit calculates the position of the subject, and the focusing module of the camera module operates according to the calculated result.

An electronic device equipped with an infrared optical device according to an embodiment of the present invention may assist the focusing function of a camera module in a low light environment by using an infrared optical device for iris recognition.

In addition, an electronic device equipped with an infrared optical device according to an exemplary embodiment may minimize power consumption while assisting a focusing function of a camera module by using an infrared optical device for iris recognition.

1 schematically shows an appearance of an electronic device equipped with an infrared optical device of the present invention.

2 is a cross-sectional view schematically showing the configuration of an infrared optical device and a camera module according to an embodiment of the present invention.

3 is a block diagram schematically showing an infrared optical device and a camera module of the present invention.

4 is a cross-sectional view showing that the infrared optical device and the camera module of the present invention operate in an iris recognition mode.

5 is a cross-sectional view showing that the infrared optical device and the camera module of the present invention operate in an infrared focusing mode.

FIG. 6 schematically shows an activation region of an infrared light receiving unit when the infrared optical device of the present invention operates in an iris recognition mode and when operating in an infrared focusing mode.

FIG. 7 is a cross-sectional view schematically illustrating a configuration of an infrared optical device, a camera module, and an illumination intensity sensing unit according to another exemplary embodiment of the present disclosure.

8 is a cross-sectional view schematically showing the configuration of an infrared optical device and a camera module according to another embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described embodiments of the present invention; In describing the present invention, if it is determined that adding specific descriptions of techniques or configurations already known in the art may make the gist of the present invention unclear, some of them will be omitted from the detailed description. In addition, terms used in the present specification are terms used to properly express the embodiments of the present invention, which may vary according to related persons or customs in the art. Therefore, the definitions of the terms should be made based on the contents throughout the specification.

Hereinafter, an electronic device equipped with an infrared optical device according to an exemplary embodiment will be described with reference to FIGS. 1 to 6.

Referring to FIG. 1, an infrared optical device 100 and a camera module 200 may be mounted together in an electronic device. 1 illustrates that the infrared optical device 100 and the camera module 200 are mounted on a smartphone, but the present invention is not limited thereto. The electronic device may be, for example, a cellular phone terminal including a smartphone, a tablet computer, a laptop computer, a PDA device, a media player, a navigation device, a game play device, an electronic device wearable on a wrist, a headphone device, a handsfree device, or the like. This can be

The infrared optical device 100 and the camera module 200 may be installed on the front side of the electronic device. The front of the electronic device generally refers to a part facing the user's face when the user uses the electronic device. Typically, the display device is located in front of the electronic device. As shown in FIG. 1, the infrared optical device 100 and the camera module 200 may be specifically positioned around the display 20 device.

The infrared optical device 100 and the camera module 200 may be installed so that at least some portions thereof are exposed to the outside. Exposing to the outside includes not only partially exposing to the outside, but also optically exposed by being covered with a light transmitting part through which light of a specific wavelength can pass. In detail, the infrared light emitting unit 110, the infrared light receiving unit 120, and the camera module 200 may be exposed to the outside through the front surface of the electronic device.

2 is a cross-sectional view schematically showing the configuration of an infrared optical device and a camera module according to an embodiment of the present invention. 2, the infrared optical device 100 and the camera module 200 of the present invention will be described.

The infrared optical device 100 includes an infrared light emitting unit 110 and an infrared light receiving unit 120. The infrared optical device 100 may be used for a plurality of purposes according to the selected operation mode. For example, the infrared optical apparatus 100 may be used for iris recognition in the iris recognition mode, or may be used for position detection of a subject in the infrared focusing mode. The operation of the infrared optical device 100 according to the operation mode will be described in detail below.

The infrared light emitting unit 110 emits light in the infrared band. The infrared light emitting unit 110 may be, for example, a light emitting diode (LED), an organic light emitting diode (OLED), or a lamp. The infrared light emitting unit 110 receives power from the power supply 111 and emits light. The power supply 111 may adjust power supplied to the infrared light emitter 110, and the power of light emitted from the infrared light emitter 110 may be adjusted according to the received power.

The infrared light receiver 120 may be an image sensor in which a plurality of imaging devices that receive light emitted from the outside and convert the light into an electrical signal are arranged. The imaging device may be a photo diode (PD). The plurality of pixels constituting the infrared light receiving unit 120 may be formed of image sensors arranged adjacent to each other in two perpendicular or diagonal directions. The infrared light receiver 120 detects light in a wavelength band of light emitted from the infrared light emitter 110.

The infrared light receiver 120 may selectively receive light having a predetermined specific wavelength band. To this end, an optical filter 125 selectively transmitting only light having a specific wavelength band may be positioned above the infrared light receiver 120. The infrared light receiver 120 preferably receives light having a wavelength band corresponding to the light emitted from the infrared light emitter 110. Accordingly, the optical filter 125 may be an optical filter having an infrared wavelength band as a pass band.

The infrared light receiver 120 mainly detects that the light emitted from the infrared light emitter 110 is reflected on an object, but does not receive only the light reflected by the infrared light emitter 110. The infrared light receiver 120 may simultaneously emit light emitted from the infrared light emitter 110 and other light having the same wavelength band. However, it is preferable that the infrared light receiver 120 mainly detects the light reflected by the infrared light emitter 110.

An infrared lens 123 may be positioned above the infrared light receiver 120. The infrared lens 123 refracts the light irradiated onto the infrared light receiving unit 120. The light irradiated onto the infrared light receiver 120 by the infrared lens 123 may be refracted and collected, and the focus may be focused on the infrared light receiver 120.

A light blocking wall 130 may be installed between the infrared light emitting unit 110 and the infrared light receiving unit 120. The light blocking wall 130 is a structure for preventing the light emitted from the infrared light emitting unit 110 from flowing directly into the infrared light receiving unit 120 without reaching the object. The light shielding wall 130 is formed to a suitable height, and is preferably formed of a light shielding resin material or the like. The light blocking wall 130 may be formed of, for example, a black plastic resin material.

The signal processor 300 is an element that receives and processes an electric signal converted by the infrared light receiver 120 to receive light. The signal processor 300 may be formed in the same package as the light receiver 200 and the light emitter 100, or may be formed as a separate package. The signal processor 300 may analyze the iris pattern photographed in the iris recognition mode to analyze the unique pattern of the iris, and calculate the position of the subject in the infrared focusing mode.

The camera module 200 is an imaging device capable of capturing an image of a subject. The camera module 200 may be a conventional camera module 200 that detects light in the visible light band and captures an image. Here, the camera module 200 is disposed in the same direction as the infrared light emitting unit 110 and the infrared light receiving unit 120 described above, and captures an image in substantially the same direction as the infrared light receiving unit 120.

The camera module 200 includes an image sensor 210, a lens 220, and a focusing module 230. The image sensor 210 is a device that detects light in the visible light band and converts it into an electrical signal. An optical filter 215 may be disposed on the image sensor 210 to selectively allow light in the visible light band to enter the image sensor 210. The optical filter 215 may block light in the infrared band with an infrared cutoff filter. The image sensor 210 may be a device composed of a plurality of pixels.

The lens 220 refracts the light irradiated onto the image sensor 210. The light irradiated onto the image sensor 210 may be refracted and collected by the lens 220, and the subject may be focused on the image sensor 210.

The lens 220 may be coupled to the focusing module 230 to move and focus in the optical axis direction. According to the position of the subject to be photographed by the camera module 200, the position in the optical axis direction of the lens 220 may be changed and may be focused. The focusing module 230 may be an actuator capable of moving the lens barrel 221 in which the lens 220 is installed in the optical axis direction. The focusing module 230 may be, for example, an actuator driven by a voice coil motor method.

The focusing module 230 may focus in various ways. The focusing module 230 may focus by moving the lens barrel 221 according to the image data of the subject detected by the image sensor 210. In detail, the focusing module 230 may use a phase difference AF method or a contrast AF method. In addition, a hybrid AF method may be used in which the phase difference AF method and the contrast AF method are mixed. In addition, a dual pixel AF method of dividing one pixel of the image pickup device of the image sensor 210 into two may operate as a phase difference sensor.

Although the above-described focusing methods are capable of relatively accurate focusing, the accuracy of focusing is deteriorated when the image of the subject is not accurately detected due to low illumination. Conventionally, in order to solve such a problem, the illumination is secured by emitting light such as red at the focusing stage, but emitting light may cause a rejection when the subject is a person, a red-eye phenomenon may occur, and color distortion may occur. There is a disadvantage. Therefore, in this case, accurate focusing may be possible by selecting the operating mode as the infrared focusing mode. This will be described in more detail below.

The controller 400 is an element for selecting and controlling a mode in which the above-described infrared optical device 100 and / or the camera module 200 operate. The controller 400 may be formed in the same package as the infrared optical apparatus 100 and the camera module 200, or may be formed as a separate package. The controller 400 determines an operation mode by itself or receives an input signal for determining an operation mode from the outside. The controller 400 may control operations of the infrared optical device 100 and / or the camera module 200 according to the determined operation mode. Control of the operation of the infrared optical device 100 and / or the camera module 200 by the controller 400 will be described in detail below.

3 is a block diagram schematically showing an infrared optical device and a camera module of the present invention. 4 is a cross-sectional view showing that the infrared optical device and the camera module of the present invention operate in an iris recognition mode. 5 is a cross-sectional view showing that the infrared optical device and the camera module of the present invention operate in an infrared focusing mode.

Referring to FIG. 3, the controller 400 may determine an operation mode. The operation mode determined by the controller 400 includes an iris recognition mode and an infrared focusing module. The controller 400 may directly determine the operation mode or may receive and determine a selection signal from the outside.

The operation mode can be selected by various criteria. For example, when the electronic device is in a locked state and the user of the electronic device tries to release the lock, the iris recognition mode may be selected as the operation mode. In addition, when the camera module 200 of the electronic device is photographing or preparing to photograph, the operating mode may be an infrared focusing mode. In addition, in some cases, even when the camera module 200 of the electronic device is shooting or preparing to shoot, first attempts to focus by operating the focusing module 230 of the camera module 200, and when this fails or is not satisfactory, infrared rays are detected. A focusing mode may be selected to assist focusing. Here, the failure of the camera module 200 to focus or unsatisfactory means that, for example, when sufficient contrast is not detected in the image acquired by the image sensor or a clear image capable of detecting a phase is not obtained. Can be.

Referring to FIG. 4, the infrared optical device 100 may operate in an iris recognition mode.

If the selected operation mode is the iris recognition mode, the infrared optical device 100 captures an image of the iris. In detail, the infrared light emitting unit 110 emits light to irradiate light in the infrared band to the iris. The emitted light is reflected by the iris and is incident on the infrared light receiver 120. The infrared light receiver 120 detects incident light and captures an image of the iris. The signal processor 300 analyzes the photographed image of the iris to analyze the unique pattern of the iris.

If the selected operation mode is the iris recognition mode, the camera module 200 focuses using the focusing module 230 of the camera module 200 itself when it is in a non-operating state or operates.

Referring to FIG. 5, the infrared optical device 100 may operate in an infrared focusing mode.

If the selected operation mode is an infrared focusing mode, the infrared optical device 100 detects the position of the subject. In detail, the infrared light emitter 110 emits light to irradiate light in the infrared band to the subject. The emitted light is reflected from the subject and incident on the infrared light receiver 120. The infrared light receiver 120 detects incident light. The signal processor 300 may calculate the position of the subject based on the data sensed by the infrared light receiver 120. In detail, the signal processor 300 may calculate a distance from which the subject is separated from the infrared optical device 100 and / or the camera module 200.

The infrared optical apparatus 100 and the signal processor 300 may detect the position of the subject in various ways. For example, the position of the subject may be calculated by measuring a time when light is emitted from the infrared emitter 110 and reflected from the subject to be detected by the infrared receiver 120. In addition, the position of the subject may be calculated using an angle emitted from the infrared light emitter 110 and reflected from the subject.

In the camera module 200, the focusing module 230 may operate according to a result calculated by the signal processor 300. In detail, when the subject is located at the position calculated by the signal processor 300, the focusing module 230 may be adjusted to focus so that the subject may be focused. The operation of the focusing module 230 by the infrared optics device 100 can be used here in a primary or auxiliary way to focus.

By using the above-described infrared focusing mode, the camera module 200 can focus quickly and accurately even in a low light environment. Since the light emitted from the infrared light emitting unit 110 is not sensed by the human eye, rejection does not occur even when the subject is a human. In addition, the camera module 200 includes an infrared cutoff filter 215 so that the image is not distorted by the light emitted from the infrared light emitting unit 110. In addition, the infrared optical device 100 for the infrared focusing mode may be used in combination with the iris recognition mode.

Referring to FIG. 6, the activation region 121 of the infrared light receiver 120 may vary according to an operation mode in which the infrared optical device 100 operates.

As shown in FIG. 6A, the infrared light receiver 120 includes a plurality of pixels. When the selected operation mode is the iris recognition mode, all or part 121 of the plurality of pixels 121 is activated to detect light. Herein, all or some of the pixels 121 may be all pixels that the infrared light receiver 120 may detect light or pixels that the light receiver 120 typically uses to sense light. In order to capture the image of the iris in the iris recognition mode and analyze the iris-specific pattern therefrom, an iris image having a certain level or higher resolution is required. Therefore, in the iris recognition mode, more pixels are activated than the infrared focusing mode to detect light.

As illustrated in FIG. 6B, when the selected operation mode is an infrared focusing mode, only some of the pixels 122 activated in the iris recognition mode are activated to sense light. The remaining pixels that are not selected are deactivated. The power consumed by the infrared light receiver 120 may be minimized by activating only the pixels 122 of a predetermined region.

In detail, in the infrared focusing mode, successive regions of some of the pixels activated in the iris recognition mode may be activated to have light. A portion of the continuous area that is activated is a center area of the infrared light receiver 120 and corresponds to a portion where an image of a subject is mainly formed. By selectively activating only the pixels that are used mainly for focusing, power can be used efficiently.

In addition, in the infrared focusing mode, only some selected pixels may be activated by binning the pixels activated in the iris recognition mode. Specifically, only some pixels spaced at regular intervals among the pixels activated in the iris recognition mode are activated. The image obtained by this method may obtain an image having the same angle of view although the resolution is reduced than that obtained in the iris recognition mode. Infrared focusing may be possible even with such a relatively low pixel image. In this manner, power consumed by the infrared light receiver 120 may be minimized.

The power of the light emitted from the infrared light emitter 110 may also vary according to the selected operation mode. For example, the infrared light emitter 110 may emit a higher level of light in the iris recognition mode than in the infrared focusing mode. This is because in the iris recognition mode, sufficient light amount is required to obtain an accurate iris image. On the other hand, in the infrared focusing mode, only the position of the subject needs to be sensed, so a large level of light is not required as in the iris recognition mode. Therefore, it is possible to minimize the power consumed by the infrared light emitting unit 110 by emitting a predetermined level of light. The level at which the infrared light emitter 110 emits light may be adjusted by the power supply 111 supplying power to the infrared light emitter 110.

Hereinafter, an electronic device equipped with an infrared optical device according to another exemplary embodiment will be described with reference to FIG. 7. For convenience of description, the present embodiment will be described with reference to FIGS. 1 to 6, which are different from the above-described embodiment.

Referring to FIG. 7, the electronic device of the present invention may further include an illuminance sensor 500. The illuminance sensor 500 may measure illuminance around the electronic device. When the illuminance measured by the illuminance sensor 500 falls below a predetermined level, an infrared focusing mode may be selected.

The focusing module 230 of the camera module 200 may lose focusing accuracy when the illuminance falls below a predetermined level. For example, when the focusing module 230 uses the Contrast AF method, the boundary of the subject may not be clearly detected in a low light situation. In addition, even in the case of using a phase difference AF method, focusing accuracy may be deteriorated when an image to compare phases is not clearly detected.

Therefore, when the ambient illumination falls below a predetermined level, an infrared focusing mode is automatically selected to assist the focusing of the camera module 200. According to this method, the infrared focusing mode may be selected and operated more quickly than the infrared focusing mode is selected after the focusing module 230 of the camera module 200 attempts to focus and fails.

Hereinafter, an electronic device equipped with an infrared optical device according to another exemplary embodiment will be described with reference to FIG. 8. For convenience of description, the present embodiment will be described with reference to FIGS. 1 to 6, which are different from the above-described embodiment.

Referring to FIG. 8, the infrared light receiver 120 further includes an infrared focusing module 124 that performs a function similar to the focusing module 230 of the camera module 200. The infrared focusing module 124 moves the infrared lens 123 in the optical axis direction to focus. The infrared focusing module 124 may be, for example, an actuator driven by a voice coil motor method.

Infrared focusing module 124 may focus in various ways. The infrared focusing module 124 may focus by moving the infrared lens 123 according to the image data of the iris or the subject detected by the infrared light receiver 120. In detail, the infrared focusing module 124 may use a phase difference AF method or a contrast AF method. In addition, a hybrid AF method may be used in which the phase difference AF method and the contrast AF method are mixed. In addition, a dual pixel AF method may be used to divide one pixel of the image pickup device of the infrared light receiver 120 into two to operate as a phase difference sensor.

When the selected operation mode is the iris recognition mode, the infrared focusing module 124 may move the infrared lens 123 so that the focus of the iris is clearly formed on the infrared light receiver 120. Accordingly, a higher quality iris image can be obtained.

In addition, when the selected operation mode is the infrared focusing mode, the infrared lens 123 may be moved by the infrared focusing module 124 so that the subject focuses on the infrared light receiver 120. The signal processor 300 may indirectly calculate the position of the subject through the position in the optical axis direction of the infrared lens 123 while the subject is in focus. The camera module 200 may focus by moving the focusing module 230 according to a result calculated by the signal processor 300.

In the above, embodiments of the electronic device equipped with the infrared optical device of the present invention and the control method of the infrared optical device have been described. The present invention is not limited to the above-described embodiment and the accompanying drawings, and various modifications and variations will be possible in view of those skilled in the art to which the present invention pertains. Therefore, the scope of the present invention should be defined not only by the claims of the present specification but also by the equivalents of the claims.

Claims

An infrared light emitting unit emitting light of an infrared band;

An infrared light receiving unit configured to sense light in a wavelength band of light emitted from the infrared light emitting unit;

A signal processor for processing a signal generated by the infrared light receiver;

A camera module including an image sensor for detecting light in a visible light band, a lens, and a focusing module for focusing the lens by moving the lens in an optical axis direction; And

A control unit controlling the infrared light emitting unit, the infrared light receiving unit, and the camera module according to a selected operation mode;

If the selected operation mode is an iris recognition mode, the infrared light emitting unit irradiates light on the iris, the infrared light receiving unit detects the light reflected from the iris to take an image of the iris,

If the selected operation mode is an infrared focusing mode, the infrared light emitting unit irradiates light onto the subject, the infrared light receiving unit senses light reflected from the subject, and the signal processing unit calculates the position of the subject, Electronic device equipped with an infrared optical device that operates the focusing module according to the result.
According to claim 1,

It further includes an illuminance detection unit for measuring the ambient illuminance,

And an infrared focusing mode selected when the illuminance measured by the illuminance sensor falls below a predetermined level.
According to claim 1,

And an infrared focusing mode is selected when the camera module fails to focus by operating the focusing module according to the image of the subject detected by an image sensor.
According to claim 1,

The infrared light receiving unit includes a plurality of pixels,

If the selected operation mode is an iris recognition mode, the infrared light receiver detects light reflected from the iris by all or part of a plurality of pixels being activated.

And the infrared light receiving unit is equipped with an infrared optical device that detects light reflected from the subject by activating some of the pixels activated in the iris recognition mode when the selected operation mode is an infrared focusing mode.
According to claim 1,

The signal processor is equipped with an infrared optical device for calculating the position of the subject by measuring the time emitted from the infrared light emitter is reflected from the subject and detected by the infrared light receiver.
According to claim 1,

And an infrared focusing module for focusing by moving the infrared lens covering the infrared light receiving unit and focusing the infrared lens in an optical axis direction.

And the signal processor is configured to operate the infrared focusing module according to the image of the subject detected by the infrared light receiver to focus and calculate the position of the subject.
Select the operation mode on the controller,

If the selected operation mode is an iris recognition mode, the infrared light emitter irradiates light in the infrared band to the iris, and the infrared light receiver detects the light reflected by the iris to take an image of the iris,

If the selected operation mode is an infrared focusing mode, the infrared light emitter irradiates the light of the infrared band to the subject, the infrared light receiver detects the light reflected by the subject, and the signal processor calculates the position of the subject, and the camera The focusing module of the module operates according to the calculated result.
The method of claim 7, wherein

If the illuminance sensor measures the illuminance of the surroundings and the measured illuminance is below a predetermined level,

And the control unit selects an operation mode as an infrared focusing mode.
The method of claim 7, wherein

If the focusing module fails to focus by operating the focusing module according to the image of the subject detected by the image sensor of the camera module,

And the control unit selects an operation mode as an infrared focusing mode.
The method of claim 7, wherein

If the selected operation mode is an iris recognition mode, a plurality of pixels are activated in the infrared light receiver to detect light,

And if a selected operation mode is an infrared focusing mode, only a part of the plurality of pixels is activated in the infrared light receiver to sense light.
The method of claim 7, wherein

And the signal processor calculates a position of the subject by measuring a time when light is emitted from the infrared emitter, reflected from the subject, and sensed by the infrared receiver.
The method of claim 7, wherein

And the signal processor calculates the position of the subject by focusing by operating an infrared focusing module according to the image of the subject detected by the infrared light receiving unit.