WO2022092363A1

WO2022092363A1 - Optical device and optical system comprising same optical device

Info

Publication number: WO2022092363A1
Application number: PCT/KR2020/015007
Authority: WO
Inventors: 이지훈; 송재선; 김덕곤
Original assignee: 주식회사 삼양옵틱스
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2022-05-05
Also published as: KR20230085155A

Abstract

The present invention relates to an optical device which controls a focus according to a control signal received from a user terminal. The optical device according to an embodiment of the present invention comprises: a lens barrel; a focusing lens; a drive unit which moves the focusing lens in the lens barrel; a communication unit which receives, from a user terminal, a focus control command for controlling a focal distance to a subject; and a control unit which controls the drive unit in order to move the position of the focusing lens according to the focus control command.

Description

An optical device and an optical system comprising the optical device

The present invention relates to an optical device and an optical system including the optical device, and more particularly, to an optical device for adjusting focus according to a control signal received from a user terminal, and an optical system including the optical device.

Machine vision refers to a technology that produces a desired result through a series of processes of capturing and processing images. For example, machine vision may comprise an optics system and a processing system. The optical system receives light and generates an image, and the processing system processes the generated image to derive a result value.

Machine vision can be applied in industrial settings. The production status of the product is generated as an image by the optical system provided in the production line, and the processing system may process the image at the point where the user is present and provide it to the user.

An object of the present invention is to provide an optical device for adjusting focus according to a control signal received from a user terminal, and an optical system including the optical device.

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

An optical device according to an embodiment of the present invention includes a barrel, a focusing lens, a driving unit for moving the focusing lens inside the barrel, and a communication unit for receiving a focus adjustment command for adjusting a focal length with a subject from a user terminal and a control unit for controlling the driving unit to move the position of the focusing lens according to the focus adjustment command.

An optical system according to an embodiment of the present invention includes a camera for generating an image of a subject, an optical device coupled to the camera and concentrating input light to deliver it to the camera, and displaying the image generated by the camera and a user terminal for transmitting a focus adjustment command for adjusting a focal length with the subject to the optical device, wherein the optical device adjusts a focal length for the subject according to the focus adjustment command .

The details of other embodiments are included in the detailed description and drawings.

1 is a view showing an optical system according to an embodiment of the present invention.

2 is a view showing an optical device according to an embodiment of the present invention.

FIG. 3 is a view for explaining the operation of the driving unit shown in FIG. 2 .

FIG. 4 is a view for explaining an operation of the distance sensor shown in FIG. 2 .

5 is a diagram for explaining a coupling relationship between an optical device and a camera.

6 is a diagram illustrating a focusing table.

7 and 8 are diagrams illustrating that the position of the focusing lens is moved by using the focusing table.

9 is a view illustrating that the position of the focusing lens is moved by a preset distance.

10 to 12 are diagrams illustrating screens of a user terminal.

13 is a view showing an optical device according to another embodiment of the present invention.

14 is a diagram for explaining an exemplary operation of an optical system.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Advantages and features of the present invention, and a method for achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments published below, but may be implemented in various different forms, and only these embodiments allow the publication of the present invention to be complete, and common knowledge in the technical field to which the present invention pertains It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used with the meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in a commonly used dictionary are not to be interpreted ideally or excessively unless clearly defined in particular.

Referring to FIG. 1 , an optical system 10 according to an embodiment of the present invention includes a camera 20 , an optical device 30 , a monitoring device 40 , and a user terminal 50 .

The camera 20 may generate an image of the subject. For example, the camera 20 may include an image sensor such as a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). Light input to the camera 20 may be detected by an image sensor, and the sensed light may be converted into an electric signal to generate a digital image.

The optical device 30 is coupled to the camera 20 , and serves to focus the input light and transmit it to the camera 20 . To this end, the optical device 30 may include a plurality of lenses. At least one of the plurality of lenses may be a focusing lens for adjusting a focal length with the subject. The focusing lens may have an adjustable position, and the focal length with the subject may vary according to the adjusted position.

The monitoring device 40 serves to display the image generated by the camera 20 . The monitoring device 40 may be remotely located with respect to the camera 20 . The image generated by the camera 20 may be transmitted to the monitoring device 40 by wire or wirelessly. The user can check the image captured by the camera 20 through the monitoring device 40 .

The user terminal 50 may transmit a focus adjustment command to the optical device 30 for adjusting a focal length with respect to the subject. In the present invention, the user terminal 50 may be a portable terminal such as a mobile phone, a smart phone, a notebook computer, or a tablet PC, but the user terminal 50 of the present invention is not limited to the portable terminal.

The user terminal 50 may wirelessly communicate with the optical device 30 . For example, the communication method between the user terminal 50 and the optical device 30 may be short-range wireless communication such as Bluetooth or Wi-Fi.

The optical device 30 may adjust a focal length of a subject according to a focus adjustment command. As described above, the optical device 30 may include a focusing lens capable of adjusting a position. When a focus adjustment command is received, the optical device 30 adjusts the position of the focusing lens according to the focus adjustment command. Accordingly, the focal length with the subject is adjusted, and the image of which the focal length is adjusted may be checked through the monitoring device 40 .

The focus adjustment command may include an identification code for the position of the focusing lens provided in the optical device 30 . The optical device 30 may store a plurality of identification codes, and may store a position of a focusing lens corresponding to each of the plurality of identification codes. When the identification code is received, the optical apparatus 30 may extract the position of the focusing lens corresponding to the received identification code from among the plurality of stored identification codes, and may move the focusing lens to the corresponding position.

When the focal lengths with the plurality of subjects are determined in advance, the user may store the identification code and the position in the optical device 30 to correspond to the focal lengths with each subject. In addition, when a specific subject is captured by the camera 20 , the user may adjust the optical device 30 to focus light to a focal length corresponding to the subject. To this end, the user may transmit a focus adjustment command including an identification code to the optical device 30 using the user terminal 50 .

Alternatively, the focus adjustment command may include a moving direction of the focusing lens provided in the optical device 30 . When the moving direction is received, the optical device 30 may move the focusing lens in the corresponding moving direction by a preset distance. Here, the moving direction may be a direction for decreasing the focal length or a direction for increasing the focal length. That is, the movement direction may be parallel to the optical axis Ax.

When a focus distance with a subject is to be finely adjusted, the user may transmit a focus adjustment command including a movement direction to the optical device 30 using the user terminal 50 . Accordingly, the optical device 30 may adjust the focal length by moving the focusing lens by a preset distance in the corresponding movement direction.

Hereinafter, the configuration and function of the optical device 30 will be described in detail with reference to FIGS. 2 to 9 .

FIG. 2 is a view showing an optical device according to an embodiment of the present invention, FIG. 3 is a view for explaining the operation of the driving unit shown in FIG. 2, and FIG. 4 is a view for explaining the operation of the distance sensor shown in FIG. 2 It is a drawing for

Referring to FIG. 2 , an optical device 30 according to an embodiment of the present invention includes a barrel 110 , an aperture 120 , a lens 130 , a driving unit 140 , a communication unit 220 , a control unit 230 and It is configured to include a distance sensor 240 .

The barrel 110 may accommodate the lens 130 and the driving unit 140 by providing an enclosed space. The barrel 110 may include an opening, and external light may be introduced into the interior of the barrel 110 through the opening.

The diaphragm 120 is provided in the opening of the barrel 110 to control the amount of light flowing into the barrel 110 . The diaphragm 120 may block at least a portion of the opening of the barrel 110 . The amount of light introduced through the opening may vary according to the degree to which the diaphragm 120 blocks the opening of the barrel 110 .

The lens 130 serves to focus the light flowing into the barrel 110 . The optical device 30 may include a plurality of lenses 130 . At least one of the plurality of lenses 130 may be a focusing lens 131 . The focusing lens 131 may be moved within the barrel 110 . For example, the focusing lens 131 may be moved in a direction parallel to the optical axis Ax. As the position of the focusing lens 131 is changed, the focal length of the lens 130 may be changed.

The driving unit 140 serves to move the focusing lens 131 inside the barrel 110 . For example, the driving unit 140 may be provided in the form of a motor to generate rotational force. The rotational force is converted into a force for horizontally moving the focusing lens 131 , and the focusing lens 131 can move along the optical axis Ax.

The communication unit 220 may receive a focus adjustment command for adjusting a focal length with a subject from the user terminal 50 . The communication unit 220 may wirelessly receive a focus adjustment command from the user terminal 50 . For example, the communication method between the communication unit 220 and the user terminal 50 may be short-range wireless communication such as Bluetooth or Wi-Fi.

The controller 230 may control the driving unit 140 to move the position of the focusing lens 131 according to the focus adjustment command received through the communication unit 220 . The driving unit 140 may move the position of the focusing lens 131 by operating according to a control command of the controller 230 . Referring to FIG. 3 , the focusing lens 131 may move along the optical axis Ax according to the operation of the driving unit 140 .

2 and 4 , the distance sensor 240 serves to detect a distance from the subject 60 .

For example, the distance sensor 240 irradiates light and detects a distance to the subject 60 by receiving light reflected by the subject 60 , or transmits ultrasonic waves and is reflected by the subject 60 . The distance to the subject 60 may be sensed by receiving the ultrasonic wave. However, the distance sensing method by the distance sensor 240 of the present invention is not limited to light and ultrasonic waves.

The controller 230 may control the driving unit 140 to move the focusing lens 131 according to the distance sensed by the distance sensor 240 . For example, the controller 230 calculates a focal length for the subject 60 in consideration of the distance between the distance sensor 240 and the focusing lens 131 , and positions the focusing lens 131 to correspond to the focal length. can be moved

When the focal length for the subject 60 is not determined in advance, the user causes the focal length to be generated based on the distance detected by the distance sensor 240 , and accordingly, the position of the focusing lens 131 can be moved. there is.

Referring back to FIG. 2 , the barrel 110 , the focusing lens 131 , and the driving unit 140 may be included in the lens module 100 , and the communication unit 220 and the control unit 230 may be included in the relay module 200 . there is. Here, the relay module 200 may further include a housing 210 and a distance sensor 240 . A communication unit 220 , a control unit 230 , and a distance sensor 240 may be provided inside or outside the housing 210 to be integrated.

The lens module 100 and the relay module 200 are distinct objects, and the lens module 100 and the relay module 200 can be detached from each other. That is, the user may selectively couple the lens module 100 and the relay module 200 or release the coupling between the lens module 100 and the relay module 200 . For mutual attachment and detachment, the lens module 100 may include a first adapter 310 , and the relay module 200 may include a second adapter 320 .

The first adapter 310 may be provided for coupling with the relay module 200 . The second adapter 320 may be provided for coupling with the first adapter 310 . That is, the first adapter 310 and the second adapter 320 may be coupled to or released from each other. For example, the first adapter 310 and the second adapter 320 may be screw-coupled, but the coupling method between the first adapter 310 and the second adapter 320 is not limited to the screw coupling method.

The relay module 200 may include a third adapter 330 for coupling with the camera 20 . A power relay line 250 may be provided between the second adapter 320 and the third adapter 330 , and a power transmission line 150 may be provided between the first adapter 310 and the driving unit 140 . can The power relay line 250 serves to transfer the power supplied to the third adapter 330 to the second adapter 320 . The power transmission line 150 serves to transmit the power supplied to the first adapter 310 to the driving unit 140 . Power supplied to the third adapter 330 may be supplied from the camera 20 .

The first adapter 310 and the second adapter 320 may each include a power terminal (not shown) for power transmission. Power supplied through the power relay line 250 may be transmitted from the second adapter 320 to the first adapter 310 , and then may be supplied to the driving unit 140 through the power transmission line 150 .

In this way, power for the operation of the driving unit 140 is supplied from the camera 20 through the third adapter 330 , and the supplied power is supplied to the driving unit ( ) through the second adapter 320 and the first adapter 310 . 140) can be transferred.

A first control relay line 261 may be provided between the third adapter 330 and the control unit 230 , and a second control relay line 262 may be provided between the control unit 230 and the second adapter 320 . there is. In addition, a control transmission line 160 may be provided between the first adapter 310 and the driving unit 140 .

The third adapter 330 may receive a control signal for the operation of the focusing lens 131 from the camera 20 . The control signal may be transmitted to the controller 230 through the first control relay line 261 . The controller 230 may generate a control command for the operation of the focusing lens 131 according to the received control signal. The control command may be transmitted to the second adapter 320 through the second control relay line 262 .

The first adapter 310 and the second adapter 320 may each include a control terminal (not shown) for transmitting a control signal. The control command transmitted through the second control relay line 262 may be transmitted from the second adapter 320 to the first adapter 310 , and then transmitted to the driving unit 140 through the control transmission line 160 .

In this way, a control signal for the operation of the driving unit 140 may be input from the camera 20 through the third adapter 330 . The control signal is transmitted to the control unit 230 , and the control unit 230 may control the operation of the driving unit 140 according to the control signal. That is, the control unit 230 generates a control command corresponding to the control signal and transmits the generated control command to the driving unit 140 .

Although it has been described above that the control unit 230 generates a control command corresponding to the control signal, according to some embodiments of the present invention, the control unit 230 may transmit the received control signal to the driving unit 140 as it is. That is, as a control signal is transmitted through the second control relay line 262 and the control transmission line 160 , the driving unit 140 operates according to the transmitted control signal to move the position of the focusing lens 131 .

Referring to FIG. 5 , the optical device 30 and the camera 20 are detachable.

The camera 20 may include a fourth adapter 340 . The fourth adapter 340 may be provided for coupling with the relay module 200 . The third adapter 330 provided in the relay module 200 may be provided for coupling with the fourth adapter 340 . That is, the third adapter 330 and the fourth adapter 340 may be coupled to or released from each other. For example, the third adapter 330 and the fourth adapter 340 may be screw-coupled, but the coupling method between the third adapter 330 and the fourth adapter 340 is not limited to the screw coupling method.

The first adapter 310 and the second adapter 320 are coupled, and the third adapter 330 and the fourth adapter 340 are coupled, whereby coupling between the optical device 30 and the camera 20 may be performed. . In addition, as the coupling between the third adapter 330 and the fourth adapter 340 is released, the coupling between the optical device 30 and the camera 20 is released, and between the first adapter 310 and the second adapter 320 is released. By releasing the coupling, the coupling between the lens module 100 and the relay module 200 may be released.

A power supply line 21 and a control supply line 22 may be connected to the fourth adapter 340 . The third adapter 330 and the fourth adapter 340 may each include a power terminal (not shown) for transmitting power, and a control terminal (not shown) for transmitting a control signal, respectively. Power supplied through the power supply line 21 may be transferred from the fourth adapter 340 to the third adapter 330 . In addition, the control signal supplied through the control supply line 22 may be transferred from the fourth adapter 340 to the third adapter 330 .

The first adapter 310 and the third adapter 330 may have the same shape. Accordingly, coupling and disengagement between the first adapter 310 and the fourth adapter 340 may be performed. For example, in a state in which the relay module 200 is excluded, it is possible to couple the lens module 100 to the camera 20 or to disconnect the lens module 100 from the camera 20 . When the first adapter 310 and the fourth adapter 340 are coupled, the power supplied through the power supply line 21 may be transferred from the fourth adapter 340 to the first adapter 310 . In addition, the control signal supplied through the control supply line 22 may be transferred from the fourth adapter 340 to the first adapter 310 .

6 is a diagram illustrating a focusing table, and FIGS. 7 and 8 are diagrams illustrating that a focusing lens is moved by using the focusing table.

Referring to FIG. 6 , the focusing table 70 may include an identification code and a focusing position.

The focusing table 70 includes a plurality of identification codes, and a focusing position may correspond to each identification code.

The controller 230 may move the position of the focusing lens 131 with reference to the focusing table 70 . Specifically, the focus adjustment command received from the user terminal 50 may include an identification code for the position of the focusing lens 131 . The controller 230 may control the driving unit 140 to move the focusing lens 131 to a focusing position corresponding to the identification code included in the focus adjustment command among the plurality of identification codes included in the focusing table 70 . . That is, the controller 230 may extract a focusing position corresponding to the identification code, generate a control command corresponding to the corresponding focusing position, and transmit it to the driving unit 140 . The driving unit 140 may move the position of the focusing lens 131 by operating according to a control command.

Referring to FIG. 7 , the focusing position corresponding to the identification code may be determined in advance.

7 illustrates that the focusing lens 131 is maintained at the focusing position corresponding to the identification code 1 .

Referring to FIG. 8 , the driving unit 140 may move the position of the focusing lens 131 according to a control command.

When identification code 4 is included in the focus adjustment command, the controller 230 may generate a control command for moving the focusing lens 131 to a focusing position corresponding to identification code 4 . The control command is transmitted to the driving unit 140 , and the driving unit 140 may move the focusing lens 131 to a focusing position corresponding to the identification code 4 .

In this way, moving the focusing lens 131 to the preset focusing position can be easily performed.

Referring back to FIG. 6 , a plurality of identification codes included in the focusing table 70 and a focusing position corresponding to each of the plurality of identification codes may be edited and stored. For example, when a focal length for the subject 60 is newly generated by using the distance sensor 240 , the user may associate a focusing position corresponding to the focal length to the identification code. Alternatively, as will be described later, the user may finely adjust the position of the focusing lens 131 .

The new focusing position may be stored to correspond to an existing identification code or to correspond to a new identification code. The user may adjust the position of the focusing lens 131 by selecting an identification code corresponding to the new focusing position.

Referring to FIG. 9 , the driving unit 140 may move the position of the focusing lens 131 by a preset distance D. Referring to FIG.

The focus adjustment command received from the user terminal 50 may include a moving direction of the focusing lens 131 . The controller 230 may control the driving unit 140 to move the focusing lens 131 in the corresponding movement direction by a preset distance D. The driving unit 140 may move the position of the focusing lens 131 by operating according to a control command.

The movement of the focusing lens 131 using the movement direction may be used for fine adjustment of the focal length. To this end, the preset distance D according to the moving direction may be formed to be smaller than the distance between adjacent focusing positions according to the identification code.

After the position adjustment of the focusing lens 131 according to the identification code is performed, the user may want to finely adjust the focal length. In this case, the user may transmit a focus adjustment command including the moving direction through the user terminal 50 . The optical device 30 may finely adjust the focal length according to the received focus adjustment command.

10 to 12 are diagrams illustrating screens of a user terminal.

Referring to FIG. 10 , the screen of the user terminal 50 may include a captured image 51 , a focal length 52 , an identification button 53 , and a fine adjustment button 54 .

The captured image 51 represents an image captured by the camera 20 . The corresponding image may be directly received from the camera 20 or may be received from the monitoring device 40 . When communication with the camera 20 and the monitoring device 40 is not possible, the captured image 51 may be removed.

Focal length 52 represents the current focal length being provided by optical device 30 . The optical device 30 may calculate the current focal length with reference to the position of the focusing lens 131 . The calculated focal length is transmitted to the user terminal 50 , and the user terminal 50 may output it.

The optical device 30 may transmit the focal length in real time or may transmit the focal length when an event occurs. For example, when the position of the focusing lens 131 is adjusted according to the identification code, the position of the focusing lens 131 is adjusted according to the movement direction, or the focal length using the distance sensor 240 is determined, the optical device 30 may transmit the focal length. Whenever the user terminal 50 receives the focal length, the previously output focal length may be updated and output as a new focal length.

The identification button 53 may receive a user command for selecting an identification code. A plurality of identification buttons 53 may be provided. A focal length 53a corresponding to the corresponding identification button 53 may be displayed adjacent to each identification button 53 . The user may select the identification button 53 with reference to the displayed focal length 53a.

The user may select one of the plurality of identification buttons 53 . When the identification button 53 is selected, a focus adjustment command including a corresponding identification code may be transmitted. For example, when the user selects the identification button 4, a focus adjustment command including the identification code 4 may be transmitted.

The fine adjustment button 54 may receive a user command to finely adjust the focal length. If the user wants to finely adjust the focal length after adjusting the focal length according to the identification code, the user may select the fine adjustment button 54 .

Although FIG. 10 shows that the identification button 53 and the fine adjustment button 54 are provided in the form of an image, this is exemplary and the identification button and the fine adjustment button may be provided in the form of a physical button.

When the fine adjustment button 54 is selected, the screen of the user terminal 50 may be switched to a fine adjustment screen for finely adjusting the focal length. 11 , when the fine adjustment button 54 is selected, the identification button 53 is removed from the screen of the user terminal 50 , and the

direction buttons

55a and 55b and the edit button 56 are displayed. can

The

direction buttons

55a and 55b may receive a user command for selecting the moving direction of the focusing lens 131 . The

direction buttons

55a and 55b may include a decrease button 55a and an increase button 55b. If the user wants to decrease the focal length, the user may select the decrease button 55a. Alternatively, if the user wants to increase the focal length, the user may select the increase button 55b.

When the

direction buttons

55a and 55b are selected, a focus adjustment command including a corresponding movement direction may be transmitted. For example, when the user selects the reduction button 55a, a focus adjustment command including a movement direction for reducing the focal length may be transmitted. Meanwhile, when the user selects the increase button 55b, a focus adjustment command including a movement direction for increasing the focal length may be transmitted. When the focus adjustment command is received, the optical device 30 may move the focusing lens 131 in the moving direction included in the focus adjustment command by a preset distance D.

The fine adjustment screen may include an edit button 56 . After the focal length is finely adjusted, if the user wants to store the corresponding focal length in correspondence with the identification code, the user may select the edit button 56 .

11 illustrates that the

direction buttons

55a and 55b and the edit button 56 are provided in the form of an image, but this is exemplary and the direction button and the edit button may be provided in the form of a physical button.

When the edit button 56 is selected, the screen of the user terminal 50 may be converted to a storage screen for storing the focal length corresponding to the identification code. 12, when the edit button 56 is selected, the

direction buttons

55a and 55b and the edit button 56 are removed from the screen of the user terminal 50, and the identification button 57 and the save button ( 58) may be displayed.

The identification button 57 may receive a user command for selecting an identification code to be stored by matching the current focal length. For example, if the user wants to store the current focal length in correspondence with the identification code 4, the user may select the identification button 4 .

The save button 58 may receive a user command to store the identification button 57 selected by the user in correspondence with the current focal length. When the storage button 58 is selected while the identification button 4 is selected, the user terminal 50 may generate a storage command including the selected identification code and transmit it to the optical device 30 .

The optical device 30 receiving the storage command may update the focusing table 70 according to the received storage command. For example, the optical device 30 may update the focusing table 70 by matching the focusing position of the focusing lens 131 corresponding to the current focal length and the identification code included in the storage command. The updating of the focusing table 70 may be performed by the controller 230 of the optical device 30 .

Once the focusing table 70 is updated, the optical device 30 may move the focusing lens 131 according to the updated focusing table 70 . That is, when a focus adjustment command including identification code 4 is received after the focusing position of identification code 4 is changed, the optical device 30 may move the focusing lens 131 to the changed focusing position.

The above has been described that the optical device 30 is provided including the lens module 100 and the relay module 200, but according to another embodiment of the present invention, the optical device 30 may be provided as a single body.

Referring to FIG. 13 , an optical device 80 according to another embodiment of the present invention includes a barrel 410 , an aperture 420 , a lens 430 , a driving unit 440 , a communication unit 450 , a control unit 460 and It may be configured to include a distance sensor 470 .

The lens 430 may include a focusing lens 431 . The barrel 410, the diaphragm 420, the lens 430, the driving unit 440, the communication unit 450, the control unit 460, and the distance sensor 470 are the above-described barrel 110, the diaphragm 120, the lens ( 130), the driving unit 140, the communication unit 220, the control unit 230, and the distance sensor 240 have the same or similar functions and shapes, so the differences will be mainly described.

The barrel 410 , the aperture 420 , the lens 430 , the driving unit 440 , the communication unit 450 , the control unit 460 , and the distance sensor 470 may be configured as a single body. That is, the barrel 410 , the aperture 420 , the lens 430 , the driving unit 440 , the communication unit 450 , the control unit 460 , and the distance sensor 470 may be manufactured and utilized as one module.

The optical device 80 may include an adapter 480 for coupling with the camera 20 . The shape and function of the adapter 480 may be the same as that of the third adapter 330 described above. Power for the operation of the driving unit 440 may be supplied from the camera 20 through the adapter 480 .

The optical device 80 shown in FIG. 13 adjusts the position of the focusing lens 431 in response to receiving a focus adjustment command from the user terminal 50 in a state coupled to the camera 20 to focus on the subject 60 . You can adjust the distance.

14 is a diagram for explaining an exemplary operation of an optical system.

Referring to FIG. 14 , the optical system 10 may provide monitoring information for

subjects

61 , 62 , and 63 having different focal lengths.

Subjects

61 , 62 , and 63 having different focal lengths may enter the imaging area of the camera 20 to which the optical device 30 is coupled. The image captured by the camera 20 may be checked through the monitoring device 40 .

The user may adjust the focal length corresponding to each of the

subjects

61 , 62 , and 63 by using the user terminal 50 . The user terminal 50 may transmit a focus adjustment command according to the input user command, and the optical device 30 may adjust a focal length according to the received focus adjustment command.

On the other hand, if the focal length of the

specific subject

61 , 62 , 63 is not stored in correspondence with the identification code, the user allows the focal length to be adjusted by the distance sensor provided in the optical device 30 or fine focus adjustment. Through this, the focal length can be adjusted.

Although embodiments of the present invention have been described with reference to the above and the accompanying drawings, those of ordinary skill in the art to which the present invention pertains can practice the present invention in other specific forms without changing its technical spirit or essential features. You can understand that there is Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

Claims

neck pain;

focusing lens;

a driving unit for moving the focusing lens inside the barrel;

a communication unit for receiving a focus adjustment command for adjusting a focal length with a subject from a user terminal; and

and a controller configured to control the driving unit to move a position of the focusing lens according to the focus adjustment command.
According to claim 1,

The focus adjustment command includes an identification code for the position of the focusing lens,

The control unit controls the driving unit to move the focusing lens to a focusing position corresponding to the identification code among a plurality of identification codes.
According to claim 1,

The focus adjustment command includes a moving direction of the focusing lens,

The control unit controls the driving unit to move the focusing lens in the moving direction by a preset distance.
According to claim 1,

Further comprising a distance sensor for detecting the distance to the subject,

The control unit controls the driving unit to move the focusing lens according to the sensed distance.
According to claim 1,

The barrel, the focusing lens and the driving unit are included in the lens module,

The communication unit and the control unit are included in the relay module,

The lens module and the relay module are detachable optical devices.
6. The method of claim 5,

The lens module includes a first adapter for coupling with the relay module,

The relay module is

a second adapter for coupling with the first adapter; and

An optical device comprising a third adapter for coupling to a camera.
7. The method of claim 6,

Power for the operation of the driving unit is supplied from the camera through the third adapter,

The supplied power is transmitted to the driving unit through the second adapter and the first adapter.
a camera that generates an image of a subject;

an optical device coupled to the camera, concentrating the input light and transmitting it to the camera;

a monitoring device for displaying the image generated by the camera; and

Comprising a user terminal that transmits a focus adjustment command for adjusting a focal length with the subject to the optical device,

The optical system is configured to adjust a focal length of the subject according to the focus adjustment command.
9. The method of claim 8,

The focus adjustment command includes an identification code for the position of the focusing lens provided in the optical device,

The optical system moves the focusing lens to a stored focusing position corresponding to the identification code.
9. The method of claim 8,

The focus adjustment command includes a moving direction of a focusing lens provided in the optical device,

The optical device moves the focusing lens in the moving direction by a preset distance.