KR102738750B1 - A vehicle side mirrors capable of forward checking and interlocking system thereof - Google Patents

Abstract

The disclosed subject matter relates to a vehicle side mirror capable of checking the front, and a linkage system thereof, which includes a camera positioned inside the side mirror on the passenger side to face the front of the vehicle and a display unit that displays an image captured by the camera, so that the driver can easily check the traffic situation in the lane ahead of the passenger side adjacent to the driver where it is difficult to secure the driver's field of vision.
The disclosed content proposes, as an embodiment, a vehicle side mirror capable of checking the front, and a linkage system thereof, including a side mirror part, a camera part built into the side mirror part to capture the front of the vehicle, a bracket part that supports the camera part and attaches the camera part to the side mirror part, and a display part that displays an image captured by the camera part.

Description

{A VEHICLE SIDE MIRRORS CAPABLE OF FORWARD CHECKING AND INTERLOCKING SYSTEM THEREOF}

The disclosed subject matter relates to a vehicle side mirror capable of checking the front, and a linkage system thereof, which includes a camera built into a side mirror of a vehicle to face forward, and a display unit that displays an image captured by the camera, and the display unit is linked with a preset terminal to control the display of a forward traffic situation image captured on one side of navigation content activated by the terminal, thereby allowing the driver to easily check the vehicle situation in front of the passenger seat where it is difficult to secure a field of vision.

Unless otherwise indicated herein, the materials described in this identifier are not prior art to the claims of this application, and their inclusion in this identifier is not an admission that they are prior art.

Recently, cars have been found frequently changing lanes on the road. Many cars change lanes because they believe that traffic flow in the new lane will be smoother than in their original lane, but because traffic flow in the new lane is not smooth, they return to the lane they were in before changing lanes.

In addition, there are many cases where drivers change lanes to the far right lane to make a right turn, but then abruptly change lanes back to the previous lane because of a vehicle illegally parked in the far right lane.

The lane next to the driver's seat can be observed by the driver, but in the case of the lane next to the passenger seat, it is difficult to perceive the traffic situation ahead from the driver's view, so there are certain limitations in accurately observing the situation ahead of the lane.

Accordingly, inventions are being proposed to install a camera on the side of a vehicle to check the vehicle situation on the passenger side.

As an example of such a vehicle situation checking camera, Republic of Korea Utility Model Registration No. 20-0283997 (registered on July 19, 2002) discloses an automobile camera device comprising a camera rotatably installed on both sides of a bumper of a car, a steering wheel detection sensor that detects and inputs the amount of rotation of the car steering wheel, a control unit that controls the projection and rotation of the camera and controls the output of an image captured by the camera, a display on which an image output through the control unit is displayed, and an operation switch unit having a plurality of operation switches that enable the operation of the camera to be controlled according to the driving conditions of the user's vehicle.

However, the aforementioned automotive camera device has a problem in that it is difficult to secure an angle at which to check the vehicle situation in front of the passenger seat because the camera is installed on the bumper of the car.

Also, as an example of a camera installed in a side mirror on the passenger seat, Korean Patent Publication No. 10-2007-0056314 (published on June 4, 2007) discloses a front and side detection device for a vehicle, characterized in that it comprises a first camera unit installed on the left and right sides of a vehicle, a second camera unit installed on the top of the vehicle, an image processing unit electrically connected to the first camera unit and the second camera unit to process image data captured by the cameras, an image display unit that displays image data processed by the image processing unit, and a control unit that controls the operation of each component, characterized in that the first camera unit is installed in a side mirror of the vehicle.

In addition, Republic of Korea Utility Model Registration No. 20-0374137 (registered on January 14, 2005) discloses a blind spot surveillance camera for a vehicle, which comprises a housing formed of a tubular body, a lens section on the front side thereof, and a fastening ring formed on the outer periphery of the housing so as to be installed in a vehicle while moving a screw section, wherein the housing has a lens body and an image signal processing section mounted on the inside thereof, a step section protruding integrally on the central portion thereof on the outside, first and second screw sections formed respectively at the front and rear with the step section as the center, a third screw section formed inwardly at the rear end of the second screw section of the housing, a rear cover on the third screw section, a front cover having a catch section and an opening formed inwardly on the first screw section of the housing, a protective window for protecting a lens protruding outwardly from the catch section of the front cover, and a fastening ring fastened and fixed to the second screw section of the housing.

However, in the case of the camera installed in the passenger side side mirror as shown in the above-mentioned cited documents, not only does the camera protrude beyond the outside of the side mirror, causing air resistance, but also, since the main purpose of the above-mentioned camera is to check the situation of the vehicle at the rear, it still has many problems in checking the situation of the vehicle ahead in the adjacent lane.

Accordingly, there is a demand for the development of a side mirror system that is equipped with a camera positioned inside the side mirror on the passenger side so as to face the front of the vehicle, thereby allowing the driver to easily check the traffic conditions ahead in the adjacent lane.

1. Republic of Korea Patent Publication No. 10-2007-0056314 (Published on June 4, 2007) 2. Republic of Korea Utility Model Registration No. 20-0374137 (Registered on January 14, 2005)

The present invention relates to a vehicle side mirror capable of checking the front, and a system for checking the front, comprising: a camera built into a side mirror of a vehicle to face the front; and a display unit for displaying an image captured by the camera; and the display unit is linked with a preset terminal so that a forward traffic situation image captured on one side of navigation content activated by the terminal can be displayed, thereby enabling a driver to easily check the front vehicle situation on the passenger seat side where it is difficult to secure a field of vision.

In addition, it is obvious that the technical tasks are not limited to the technical tasks described above, and that other technical tasks may be derived from the following description.

The disclosed content proposes, as an embodiment, a vehicle side mirror capable of checking the front, and a linkage system thereof, including a side mirror part, a camera part built into the side mirror part to capture the front of the vehicle, a bracket part that supports the camera part and attaches the camera part to the side mirror part, and a display part that displays an image captured by the camera part.

According to a preferred feature of the disclosed content, the display unit includes an in-vehicle device control module that is linked with a screen display device mounted in a vehicle and controls a front traffic situation image to be displayed on one side of navigation content provided by the screen display device, and a user terminal control module that is linked with a navigation application of a preset user terminal and controls a captured image to be displayed on one side of the activated navigation content.

According to a preferred feature of the disclosed subject matter, the screen display device is at least one selected from a vehicle display, a head-up display or a black box.

According to a preferred feature of the disclosed content, the bracket part includes a bracket body comprising a first end connected to the camera part and a second end connected adjacent to the first end and connected to the side mirror part, and the bracket body is arranged to cover one side of the camera part and a side surface adjacent to the one side.

According to a preferred feature of the disclosed content, the first stage includes a first fastening screw for fastening the camera section and the first stage, and a first fastening hole into which the first fastening screw is inserted and fixed; and the first fastening hole is configured as a longitudinal through hole so that the fixing position of the first fastening screw is adjusted.

According to a preferred feature of the disclosed content, the second stage includes a second fastening screw for fastening the side mirror portion and the second stage, and a second fastening hole into which the second fastening screw is inserted and fixed, and the second fastening hole is configured as a longitudinal through hole so that the fixing position of the second fastening screw is adjusted.

According to a preferred feature of the disclosed content, the side mirror portion includes a transparent window made of a transparent material provided on one side of the body facing the front of the body and an adjacent lane, and the camera portion has a lens arranged adjacent to the transparent window.

According to a preferred feature of the disclosed content, the camera device comprises a tilting unit coupled to the rear end of the camera unit and rotating the camera unit up, down, left, and right to adjust the front shooting angle and shooting position of the camera unit, and a controller controlling the operation of the camera unit and the tilting unit.

According to a preferred feature of the disclosed content, the camera unit is mounted on the passenger side side mirror to capture the situation of a front vehicle in an adjacent lane on the passenger side where it is difficult for the driver to secure a field of vision.

According to a vehicle side mirror capable of checking the front and a linkage system thereof according to one embodiment disclosed, by providing a camera positioned to face the front of the vehicle inside the side mirror on the passenger side, not only can the traffic situation of a vehicle in front of an adjacent lane on the passenger side where it is difficult for the driver to secure a field of vision be easily checked, but also since the camera does not protrude beyond the outer edge of the side mirror, it does not cause air resistance and does not cause any aesthetic problems.

In addition, it includes a display unit that displays an image captured by a camera unit, and the display unit includes an in-vehicle device control module that is linked with a screen display device mounted in the vehicle and a user terminal control module that is linked with a navigation application of a preset user terminal, thereby enabling the driver to check the traffic situation ahead on various screens, thereby enabling safe driving.

In addition, the display unit includes not only an in-vehicle device control module that is linked with a screen display device mounted in the vehicle, but also a user terminal control module that is linked with a navigation application of a preset user terminal, thereby enabling a driver using a navigation application of a mobile terminal to check the traffic situation ahead captured by the camera unit, thereby enabling safe driving.

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

FIG. 1 is a configuration diagram and a usage status diagram showing the overall configuration of a vehicle side mirror capable of forward confirmation and a linkage system thereof according to an embodiment of the disclosed content.
FIG. 2 is a schematic diagram showing the overall configuration of a side mirror for a vehicle capable of forward confirmation according to an embodiment of the disclosed content.
FIG. 3 is a perspective view of a side mirror portion according to an embodiment of the disclosed content.
FIG. 4 is an enlarged view showing a detailed configuration of a camera portion and a bracket portion according to an embodiment of the disclosed content.
FIG. 5(a) is a first state diagram showing a state in which an in-vehicle device control module according to an embodiment of the disclosed content is linked to a vehicle display and a captured image is displayed.
FIG. 5(b) is a second state diagram showing a state in which a vehicle in-vehicle device control module according to an embodiment of the disclosed content is linked to a head-up display and a captured image is displayed.
FIG. 5(c) is a third state diagram showing a state in which a vehicle in-vehicle device control module according to an embodiment of the disclosed content is linked to a black box and a captured image is displayed.
FIG. 6 is a state diagram showing a state in which a user terminal control module according to an embodiment of the disclosed content is linked with a preset user terminal and a captured image is displayed.
FIG. 7 is a block diagram showing the usage status of a tilting unit and a controller according to an embodiment of the disclosed content.
FIG. 8 is a block diagram showing the configuration of a display unit according to an embodiment of the disclosed content.

Hereinafter, the configuration and operational effects of a preferred embodiment will be examined with reference to the attached drawings. For reference, in the drawings below, each component is omitted or schematically illustrated for convenience and clarity, and the size of each component does not reflect the actual size. In addition, the same reference numerals refer to the same components throughout the specification, and drawing numerals for the same configuration in individual drawings are omitted.

FIG. 1 is a configuration diagram and a use state diagram showing the overall configuration of a vehicle side mirror capable of forward confirmation and a linkage system thereof according to an embodiment of the disclosed content, and FIG. 2 is a configuration diagram showing the overall configuration of a vehicle side mirror capable of forward confirmation according to an embodiment of the disclosed content.

A vehicle side mirror capable of forward confirmation and a linkage system thereof according to an embodiment of the disclosed content (1) include a camera unit (200) positioned inside the side mirror on the passenger seat side to face the front of the vehicle and a display unit (500) that displays an image captured by the camera unit (200), so that the driver can easily check the traffic situation of a vehicle in the front adjacent lane on the passenger seat side where it is difficult for the driver to secure a field of vision, and may include a side mirror unit (100), a camera unit (200), a bracket unit (300), a display unit (500), a connecting line (400), a controller (600), and a tilting unit (700) as illustrated in FIGS. 1 and 2.

FIG. 3 is a perspective view of a side mirror portion according to an embodiment of the disclosed content.

The side mirror part (100) according to the disclosed content may include a side mirror body (110) and a transparent window (120) made of a transparent material provided on one side of the body facing the front of the adjacent lane.

The above-mentioned transparent window (120) is arranged on one side of the main body (110) facing forward, and may be made of a transparent material so that the lens (220) of the camera unit (200) built into the side mirror unit (100) can be arranged adjacent to it to capture the front.

Therefore, it may be desirable for the above-mentioned transparent window (120) to be composed of a material that allows shooting through the lens (220) while protecting the lens (220) from the external environment.

The above camera unit (200) can be built into the side mirror unit (100) to photograph the front of the vehicle.

In addition, the camera unit (200) is mounted on the side mirror on the passenger seat side, so that it can capture the situation of a vehicle ahead in the adjacent lane on the passenger seat side where it is difficult for the driver to secure a field of vision.

In addition, the camera unit (200) is composed of a camera body (210) and a lens (220), and the lens (220) can be placed adjacent to the transparent window (120) so as to face the front of the vehicle.

Accordingly, the camera unit (200) is configured to capture the front of the adjacent lane on the passenger seat side and transmit the captured image to the display unit (500) so that the driver can recognize the traffic situation ahead of the adjacent lane on the passenger seat side, which is difficult to see ahead, through the display unit (500) and then safely change lanes.

Accordingly, when changing lanes, the driver can recognize the rear traffic situation of the adjacent lane through the mirror of the side mirror unit (100) and check the front traffic situation of the adjacent lane captured by the camera unit (200) through the display unit (500), thereby enabling the driver to check the traffic density or illegal parking situation in front of the adjacent lane in advance before changing lanes.

FIG. 4 is an enlarged view showing a detailed configuration of a camera portion and a bracket portion according to an embodiment of the disclosed content.

The bracket part (300) according to the disclosed content is configured to support the camera part (200) as shown in FIG. 4 and to fasten the camera part (200) to the side mirror part (100).

Specifically, the bracket part (300) is configured to fix the camera part (200) built into the side mirror part (100) to the side mirror body (110), and may include a bracket body (310), a first bracket connection part (320), and a second bracket connection part (330).

The above bracket body (310) is configured in an ‘ㄱ’ shape so as to cover one side of the camera unit (200) and a side adjacent to the one side, and may be configured with a first stage (311) and a second stage (312).

The above first section (311) may be one side of the bracket body (310) that is connected to the camera unit (200).

In addition, the first stage (311) may include a first fastening screw (311a) that fastens the camera unit (200) and the first stage (311) and a first fastening hole (311b) into which the first fastening screw (311a) is inserted and fixed.

The above first fastening hole (311b) is configured as a longitudinal through hole so that the fixing position of the first fastening screw (311a) can be adjusted by moving to the left or right to adjust the position of the camera unit (200).

The above second stage (312) may be a side of the bracket body (310) that is connected to the side mirror part (100).

In addition, the second stage (312) may include a second fastening screw (312a) that fastens the side mirror part (100) and the second stage (312) and a second fastening hole (312b) into which the second fastening screw (312a) is inserted and fixed.

In addition, the second fastening hole (312b) is configured as a longitudinal hole so that the fixing position of the second fastening screw (312a) can be adjusted by moving to the left or right to adjust the position of the camera unit (200).

The above first bracket connecting section (320) may be a member that is connected to fasten the first section (311) and the camera section (200).

The above second bracket connecting section (330) may be a member that is connected to fasten the second section (312) and the side mirror section (100).

FIG. 8 is a block diagram showing the configuration of a display unit according to an embodiment of the disclosed content.

The display unit (500) according to the disclosed content is configured to display an image captured by the camera unit (200) as shown in FIG. 8.

Specifically, the display unit (500) is configured to control the display of an image of a traffic situation in an adjacent lane captured by the camera unit (200), so that the image can be displayed on one side of the navigation screen in the vehicle or the navigation application of the user terminal so that the image can be easily checked while driving.

Accordingly, the display unit (500) may include an in-vehicle device control module (510) and a user terminal control module (520).

FIG. 5(a) is a first state diagram showing a state in which an in-vehicle device control module according to an embodiment of the disclosed content is linked with a vehicle display and a captured image is displayed, FIG. 5(b) is a second state diagram showing a state in which an in-vehicle device control module according to an embodiment of the disclosed content is linked with a head-up display and a captured image is displayed, and FIG. 5(c) is a third state diagram showing a state in which an in-vehicle device control module according to an embodiment of the disclosed content is linked with a black box and a captured image is displayed.

The above-described in-vehicle device control module according to the disclosed content is configured to control a forward traffic situation image captured on one side of navigation content provided by the screen display device to be displayed in conjunction with a screen display device mounted in the vehicle, as illustrated in FIG. 5(a), FIG. 5(b), and FIG. 5(c).

Additionally, the screen display device mounted in the vehicle may be at least one selected from a vehicle display (10), a head-up display (20), or a black box (30).

Accordingly, the above-described in-vehicle device control module (510) displays the traffic situation ahead of the adjacent lane captured by the camera unit (200) on a screen built into the vehicle, such as a vehicle display (10), head-up display (20), or black box (30) in which navigation is activated, so that the traffic situation ahead captured by the camera unit (200) can be displayed on one side of the navigation content activated in the above-described device.

Accordingly, the driver can easily check the situation ahead of the adjacent lane on the passenger side, such as traffic congestion, traffic accidents, or illegal parking in the adjacent lane, on the navigation screen while driving, and drive safely.

FIG. 6 is a state diagram showing a state in which a user terminal control module according to an embodiment of the disclosed content is linked with a preset user terminal and a captured image is displayed.

The user terminal control module (520) according to the disclosed content is linked with the navigation application of the preset user terminal (40) as shown in FIG. 6, and controls the captured image to be displayed on one side of the activated navigation content.

Specifically, the user terminal control module (520) is linked with a navigation app (application) of a mobile terminal, such as a mobile phone, used by the user rather than a screen display device built into the vehicle, and controls the image captured by the camera unit (200) to be displayed on one side of the navigation screen when the app is activated.

A user terminal (40) is a terminal means for a user to access a navigation system and receive content from the navigation system, selectively receive services provided by a website, and in particular, receive content with a large file size, map information, firmware, etc. that may be difficult to receive through a wireless Internet network.

Accordingly, the vehicle side mirror capable of forward confirmation and the interlocking system (1) thereof according to the disclosed content are configured to display traffic information of an adjacent lane captured by a camera unit (200) on one side of a navigation content screen running on a user terminal (40), thereby providing traffic information of an adjacent lane captured by the camera unit (200) not only to the navigation screen in the vehicle but also to a driver using the navigation content of the user terminal (40), thereby implementing convenient and safe driving.

Accordingly, the driver can check the front situation of the adjacent lane through the display unit (500) on one side of the navigation screen of the vehicle display (10) displayed on the front of the vehicle or the navigation content screen running on a preset user terminal (40) and then perform an efficient lane change.

The above connecting line (400) is configured to electrically connect the camera unit (200) and the display unit (500).

FIG. 7 is a block diagram showing the usage status of a tilting unit and a controller according to an embodiment of the disclosed content.

The tilting part (700) according to the disclosed content is coupled to the rear end of the camera part (200) as shown in FIG. 7, and rotates the camera part (200) up, down, left, and right to adjust the front shooting angle and shooting position of the camera part (200).

Additionally, the camera unit (200) and the tilting unit (700) can be controlled by the controller (600).

In addition, the vehicle side mirror and its linkage system (1) capable of forward confirmation according to the disclosed content may further include a speed detection unit (800) provided on one side of the side mirror unit (100) to detect the driving speed of a vehicle driving in an adjacent lane.

At this time, the controller (600) compares the speed value of the vehicle in the adjacent lane measured by the speed detection unit (800) with the speed value of the current vehicle in motion, and if the difference in the speed values exceeds the preset range, the tilting unit (700) adjusts the shooting angle of the camera unit (200) to adjust the front shooting position to be further or closer so that the front situation can be checked more accurately.

In addition, the controller (600) controls the operation of the tilting unit (700) to adjust the shooting angle of the camera unit (200) to observe not only the situation ahead of the first lane immediately adjacent to the passenger seat, but also the traffic situation ahead of the second lane adjacent to the first lane.

Accordingly, the driver can change lanes safely and efficiently by smoothly adjusting the angle of the tilting unit (700) when changing lanes, by observing the traffic situation ahead, not only when changing lanes in the lane right next to that, but also when changing lanes in the lane next to that.

That is, the driver can check whether there is a lot or little traffic ahead of the adjacent lane through the display unit (500) or whether there is a vehicle illegally parked ahead of the adjacent lane, thereby enabling the driver to efficiently and safely determine whether to change lanes.

According to a vehicle side mirror capable of checking the front and a linkage system thereof according to one embodiment disclosed, by providing a camera positioned to face the front of the vehicle inside the side mirror on the passenger side, not only can the traffic situation of a vehicle in front of an adjacent lane on the passenger side where it is difficult for the driver to secure a field of vision be easily checked, but also since the camera does not protrude beyond the outer edge of the side mirror, it does not cause air resistance and does not cause any aesthetic problems.

In addition, it includes a display unit that displays an image captured by a camera unit, and the display unit includes an in-vehicle device control module that is linked with a screen display device mounted in the vehicle and a user terminal control module that is linked with a navigation application of a preset user terminal, thereby enabling the driver to check the traffic situation ahead on various screens, thereby enabling safe driving.

In addition, the display unit includes not only an in-vehicle device control module that is linked with a screen display device mounted in the vehicle, but also a user terminal control module that is linked with a navigation application of a preset user terminal, thereby enabling a driver using a navigation application of a mobile terminal to check the traffic situation ahead captured by the camera unit, thereby enabling safe driving.

Although the preferred embodiments of the present invention have been described with reference to the attached drawings, the embodiments described in this specification and the configurations illustrated in the drawings are only the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention, and it should be understood that there may be various equivalents and modified examples that can replace them at the time of filing this application. Therefore, it should be understood that the embodiments described above are exemplary and not restrictive in all respects, and the scope of the present invention is indicated by the claims described below rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and the equivalent concepts should be interpreted as being included in the scope of the present invention.

1: Side mirror for vehicle capable of checking the front and its linkage system
10: Vehicle display 20: Head-up display
30: Black box 40: User terminal
100: Side mirror part 110: Body
120 : Transmission window 200 : Camera section
210 : Camera body 220 : Lens
300: Bracket part 310: Bracket body
311: 1st stage 311a: 1st fastening screw
311b: 1st connecting hole 312: 2nd stage
312a: Second fastening screw 312b: Second fastening hole
320: 1st bracket connection 330: 2nd bracket connection
400: Connection wire 500: Display section
510: In-vehicle device control module 520: User terminal control module
600 : Controller 700 : Tilting part
800 : Speed detection unit

Claims (9)

Side mirror section;
A camera unit built into the side mirror to capture the front of the vehicle;
A bracket part that supports the above camera part and attaches the camera part to the side mirror part;
A display section that displays images captured by the above camera section;
A tilting unit coupled to the rear end of the camera unit to rotate the camera unit up, down, left, and right to adjust the front shooting angle and shooting position of the camera unit; and
A controller for controlling the operation of the camera unit and the tilting unit is included;
The above display part,
An in-vehicle device control module that is linked to a screen display device mounted in a vehicle and controls a forward traffic situation image captured on one side of the navigation content provided by the screen display device to be displayed; and
It includes a user terminal control module that controls the display of a captured image on one side of the activated navigation content by linking with a navigation application of a preset user terminal;
The above bracket part,
A bracket body comprising a first end connected to the camera section and a second end connected adjacent to the first end and connected to the side mirror section;
The above bracket body is,
It is arranged to cover one side of the above camera part and a side adjacent to the above one side,
The first paragraph above is,
A first fastening screw for fastening the above camera part and the first stage; and
Including a first fastening hole into which the first fastening screw is inserted and fixed;
The above first connecting piece is,
A vehicle side mirror capable of forward confirmation and a linkage system thereof, characterized in that the side mirror is configured with a longitudinal hole so that the fixing position of the first fastening screw is adjusted.
delete In paragraph 1,
The above screen display device,
A vehicle side mirror capable of forward confirmation and a linkage system thereof, characterized by at least one selected from a vehicle display, a head-up display, and a black box.
delete delete In paragraph 1,
The second paragraph above is,
A second fastening screw for fastening the side mirror section and the second stage; and
Including a second fastening hole into which the second fastening screw is inserted and fixed;
The above second connecting piece is,
A vehicle side mirror capable of forward confirmation and a linkage system thereof, characterized in that the side mirror is configured with a longitudinal hole so that the fixing position of the second fastening screw is adjusted.
In paragraph 1,
The above side mirror part,
Body; and
Including a transparent window made of a transparent material provided on one side of the main body facing the front of the adjacent lane;
The above camera part,
A forward-viewing vehicle side mirror and its linkage system, characterized in that the lens is positioned adjacent to the above-mentioned transparent window.
delete In paragraph 1,
The above camera part,
A vehicle side mirror and its linkage system capable of confirming the front, which is mounted on the passenger side side mirror and features a photograph of the situation of a vehicle ahead in an adjacent lane on the passenger side where it is difficult for the driver to secure a field of vision.

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