Rearview mirror and control method thereof

Abstract

The invention relates to the technical field of rearview mirrors, in particular to a rearview mirror and a control method thereof.The rearview mirror comprises a main lens, a shell, an auxiliary lens and a rotating mechanism, and the main lens is fixed to the shell. And the secondary lens is arranged on the shell. The rotating mechanism is in transmission connection with the auxiliary lens and is used for driving the auxiliary lens to rotate so as to change an included angle formed by a normal plane of the auxiliary lens and an initial normal plane, the auxiliary lens is a curvature lens, and the initial normal plane is a normal plane where the auxiliary lens is located at an initial position. According to the rearview mirror, the view limitation of a driver during turning can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of rearview mirrors, and in particular to a rearview mirror and a control method thereof. Background Art

[0002] A rearview mirror is a component used to provide the driver with a rear view. It can reflect light from the rear to the driver's eyes, thus helping the driver observe the situation behind.

[0003] The rearview mirror includes a mirror surface, which forms an angle with the length direction of the vehicle body, so that it can reflect light from the rear.

[0004] In the related art, when a car turns, the rearview mirror is blocked by the car body, so the visual field is limited, which is not conducive to the driver's observation of road conditions. Summary of the invention

[0005] In view of this, the present application provides a rearview mirror and a control method thereof to reduce the field of vision limitation of the driver when turning.

[0006] Specifically, the following technical solutions are included:

[0007] A first aspect of the present application provides a rearview mirror, the rearview mirror comprising a main lens, a housing, a secondary lens and a rotating mechanism, wherein:

[0008] The main lens is fixed to the housing.

[0009] The secondary lens is mounted on the housing.

[0010] The rotating mechanism is transmission-connected to the auxiliary lens, and is used to drive the auxiliary lens to rotate so as to change the angle formed by the normal plane of the auxiliary lens and the initial normal plane, wherein the auxiliary lens is a curvature lens, and the initial normal plane is the normal plane of the auxiliary lens in the initial position.

[0011] Optionally, the rotating mechanism comprises a first linear drive assembly and a second linear drive assembly, and the first linear drive assembly and the second linear drive assembly are both connected to the back surface of the secondary lens and are used to drive the secondary lens to move in a horizontal direction respectively.

[0012] Optionally, the first linear drive assembly includes a first motor, a first worm gear, a first worm and a first screw, the first motor is transmission-connected to the first worm, the outer side of the first worm gear is meshed with the first worm, the inner side of the first worm gear is threadedly connected to the first screw, and one end of the first screw is connected to the back side of the secondary lens, and / or the second linear drive assembly includes a second motor, a second worm gear, a second worm and a second screw, the second motor is transmission-connected to the second worm, the outer side of the second worm gear is meshed with the second worm, the inner side of the second worm gear is threadedly connected to the second screw, and one end of the second screw is connected to the back side of the secondary lens.

[0013] Optionally, the rearview mirror comprises a transition lens, wherein the transition lens is located between the main lens and the secondary lens.

[0014] Optionally, the ratio of the area of ​​the primary lens, the area of ​​the transition lens and the area of ​​the secondary lens is 9:1:5.

[0015] A second aspect of the present application provides a method for controlling a rearview mirror, the method for controlling a rearview mirror being applied to the rearview mirror according to the above technical solution, the method comprising:

[0016] Determine if the car has a tendency to turn;

[0017] If the car has a tendency to turn, the rotation mechanism is controlled to change the size of the angle according to the turning center angle;

[0018] If the automobile has no turning tendency, the rotating mechanism is controlled not to work.

[0019] Optionally, controlling the rotation mechanism to change the size of the angle according to the turning center angle specifically includes:

[0020] The relative position relationship between the rearview mirror and the turning center angle is determined.

[0021] Optionally, controlling the rotation mechanism to change the size of the angle according to the turning center angle specifically includes:

[0022] If the rearview mirror is located inside the center angle of the turning circle, then:

[0023] If the turning center angle ranges from 15 to 45°, the angle of the included angle changes by 4°;

[0024] If the turning center angle ranges from 46° to 70°, the angle of the included angle changes by 7°;

[0025] If the turning center angle ranges from 71° to 90°, the angle of the included angle is changed by 0°;

[0026] If the rearview mirror is located outside the center angle of the turning circle, then:

[0027] If the turning center angle ranges from 15 to 45°, the angle of the included angle changes by 4°;

[0028] If the turning center angle ranges from 46° to 70°, the angle of the included angle is changed by 5°;

[0029] If the turning center angle ranges from 71° to 90°, the angle of the included angle is changed by 0°.

[0030] Optionally, the determining whether the vehicle has a turning tendency specifically includes:

[0031] Obtaining the speed of the vehicle;

[0032] If the speed of the vehicle is greater than 25 km / h, it is determined that the vehicle has no turning tendency;

[0033] If the vehicle speed of the vehicle is less than 25 km / h, it is determined that the vehicle has a turning tendency.

[0034] Optionally, the determining whether the vehicle has a turning tendency further includes:

[0035] Get the status of the turn signal;

[0036] If the turn signal lamp is in working state and the indicated turning direction is consistent with the turning center angle, it is determined that the vehicle has a turning tendency;

[0037] If the turn signal lamp is in working state and the directions of the indicated turning circular angles are inconsistent, and the angle of the turning center angle is greater than 15°, it is determined that the vehicle has a turning tendency;

[0038] If the turn signal lamp is not in working state and the angle of the turning center angle is greater than 15°, it is determined that the vehicle has a turning tendency.

[0039] The beneficial effects of the technical solution provided by the embodiment of the present application include at least: both the main lens and the auxiliary lens can reflect the light from the rear to the driver's eyes. The rotation mechanism drives the auxiliary lens to rotate, which is beneficial for the driver to obtain light from other directions from the rear through the auxiliary lens, and the main lens fixed to the housing can retain part of the light in the original position, which is beneficial to reduce the blind spot of the driver when turning, thereby reducing the field of vision restriction of the driver when turning. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 A schematic diagram of the structure of a rearview mirror provided in an embodiment of the present application;

[0042] Figure 2 A schematic diagram of the structure of a rotating mechanism provided in an embodiment of the present application;

[0043] Figure 3 A schematic diagram of the structure of a screw and a worm gear provided in an embodiment of the present application;

[0044] Figure 4 A schematic flow chart of a method for controlling a rearview mirror provided in an embodiment of the present application;

[0045] Figure 5 A schematic diagram of a process for controlling a rotating mechanism to change the size of an angle according to a turning center angle provided in an embodiment of the present application;

[0046] Figure 6 A schematic diagram of a process for determining whether a car has a turning tendency provided in an embodiment of the present application;

[0047] Figure 7 A schematic diagram of an angle formed by a secondary lens and a normal plane provided in an embodiment of the present application.

[0048] The reference numerals in the figures represent respectively:

[0049] 1. Main lens;

[0050] 2. Shell;

[0051] 3. Secondary lens;

[0052] 4. Rotation mechanism; 41. First linear drive assembly; 411. First motor; 412. First worm gear; 413. First worm; 414. First screw; 42. Second linear drive assembly; 421. Second motor; 422. Second worm gear; 423. Second worm; 424. Second screw;

[0053] 5. Transition lenses.

[0054] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0056] The directional nouns involved in the embodiments of the present application, such as "upper", "lower", "side", etc., are generally represented by Figure 1 The relative relationship of the orientation shown in the figure is used as the basis, and these orientation terms are used only to more clearly describe the relationship between structures, not to describe absolute orientation. When the product is placed in different postures, the orientation may change, for example, "up" and "down" may be interchangeable.

[0057] Unless otherwise defined, all technical terms used in the embodiments of the present application have the same meanings as commonly understood by those of ordinary skill in the art.

[0058] In order to make the technical solutions and advantages of the present application more clear, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0059] The first aspect of the present application provides a rearview mirror, such as Figure 1 , Figure 2 and Figure 3 As shown, the rearview mirror includes a housing 2, a main lens 1, a secondary lens 3 and a rotating mechanism 4, wherein:

[0060] The main lens 1 is fixed to the housing 2 .

[0061] The secondary lens 3 is mounted on the housing 2 .

[0062] The rotating mechanism 4 is connected to the auxiliary lens 3 for driving the auxiliary lens 3 to rotate so as to change the angle between the normal plane of the auxiliary lens 3 and the initial normal plane. The auxiliary lens 3 is a curvature lens, and the initial normal plane is the normal plane of the auxiliary lens 3 in the initial position.

[0063] It is understandable that both the main lens 1 and the auxiliary lens 3 can reflect light from the rear to the driver's eyes. The rotation mechanism 4 drives the auxiliary lens 3 to rotate, which is beneficial for the driver to obtain light from other directions from the rear through the auxiliary lens 3, and the main lens 1 fixed to the housing 2 can retain part of the light in the original position, which is beneficial to reduce the blind spot of the driver when turning, and reduce the visual field limitation of the driver when turning.

[0064] In the embodiment of the present application, the main lens 1 and the housing 2 can be fixed by bonding or other methods.

[0065] In the embodiment of the present application, when the rearview mirror is installed on the vehicle body, the main lens 1 is closer to the vehicle body than the auxiliary lens 3, which is beneficial for the auxiliary lens 3 to obtain more fields of view by rotating.

[0066] In the embodiment of the present application, the shell 2 may have a connecting portion, and the connecting portion may be connected to the vehicle body by welding, bolt connection, etc.

[0067] In the embodiment of the present application, the main lens 1 can be a flat lens or a lens with curvature.

[0068] In the embodiment of the present application, the initial position of the secondary lens 3 may refer to the position where the field of view transmitted to the driver by the secondary lens 3 overlaps with the field of view transmitted to the driver by the primary lens 1 when the car is traveling in a straight line.

[0069] In an embodiment of the present application, the automobile may include a control module, which is used to control the rotation of the rotating mechanism 4 according to the angle of the turn, so that the secondary lens 3 can reduce the field of vision limitation of the driver when turning.

[0070] In the embodiment of the present application, the secondary lens 3 may be a convex mirror.

[0071] In the embodiment of the present application, an ultrasonic sensor can be installed on the rearview mirror to sense that an object is approaching. The main lens 1 can be equipped with a blind spot monitoring and warning system to issue a light warning when the ultrasonic sensor senses that an object is too close. The rearview mirror can also be integrated with a buzzer of the voice control system in the car, and a sound warning can be issued at the same time. Through the entire turning process, uninterrupted detection and reminders are provided to remind the driver to closely observe the exterior rearview mirror. Preventing traffic safety accidents caused by potential dangers during driving is conducive to the driver to slow down or stop according to the road conditions. After multiple observations, the car can complete the turn.

[0072] In some of the embodiments of this application, Figure 2 As shown, the rotating mechanism 4 includes a first linear drive component 41 and a second linear drive component 42. The first linear drive component 41 and the second linear drive component 42 are both connected to the back of the secondary lens 3 to respectively drive the secondary lens 3 to move in the horizontal direction.

[0073] It is understandable that one of the first linear drive assembly 41 and the second linear drive assembly 42 can be used as a fulcrum when the secondary lens 3 rotates, and the other drives the portion connected to the secondary lens 3 along a straight line to realize the rotation of the secondary lens 3.

[0074] In the embodiment of the present application, the auxiliary lens 3 can be driven by the first linear drive component 41 to move closer to and farther from the housing 2 , thereby cooperating with the second linear drive component 42 to realize the rotation of the auxiliary lens 3 .

[0075] In the embodiment of the present application, the auxiliary lens 3 can be driven by the second linear drive component 42 to move closer to and farther from the housing 2 , thereby cooperating with the first linear drive component 41 to realize the rotation of the auxiliary lens 3 .

[0076] In some of the embodiments of this application, Figure 2 As shown, the first linear drive assembly 41 includes a first motor 411, a first worm gear 412, a first worm 413 and a first screw 414. The first motor 411 is connected to the first worm 413 by transmission. The outer side of the first worm gear 412 is meshed with the first worm 413. The inner side of the first worm gear 412 is threadedly connected to the first screw 414. One end of the first screw 414 is connected to the back side of the secondary lens 3.

[0077] In the embodiment of the present application, the first motor 411 can drive the first worm 413 to rotate, and then drive the first worm wheel 412 to rotate, so that the first screw 414 can move in the horizontal direction relative to the first worm wheel 412, so as to achieve the driving effect on the secondary lens 3 in the straight line direction. Specifically, the first motor 411 drives the first worm 413 to rotate around its axis, so that the worm wheel meshing with the first worm 413 can rotate around its axis, and the first screw 414 is connected to the first worm wheel 412 through a thread, and the rotating first worm wheel 412 changes the screwing position with the first screw 414, and the first worm wheel 412 generally has only the degree of freedom around its axis to achieve meshing with the first worm 413, so the first screw 414 moves in the straight line direction under the drive of the first worm wheel 412, so as to drive the secondary lens 3 to move.

[0078] In the embodiment of the present application, the first screw 414 and the back side of the secondary lens 3 are connected via a ball head support, so that when the first screw 414 can drive the secondary lens 3 to move in the horizontal direction, it can rotate around the second linear drive component 42, and the second linear drive component 42 can also be used as a fulcrum for the secondary lens 3 to rotate when driving the secondary lens 3 to move in the horizontal direction.

[0079] In some of the embodiments of this application, Figure 2 As shown, the second linear drive assembly 42 includes a second motor 421, a second worm gear 422, a second worm 423 and a second screw 424. The second motor 421 is connected to the second worm 423 through transmission. The outer side of the second worm gear 422 is meshed with the second worm 423. The inner side of the second worm gear 422 is threadedly connected to the second screw 424. One end of the second screw 424 is connected to the back side of the secondary lens 3.

[0080] In the embodiment of the present application, the second motor 421 can drive the second worm 423 to rotate, and then drive the second worm wheel 422 to rotate, so that the second screw 424 can move in the horizontal direction relative to the second worm wheel 422, so as to achieve the driving effect on the secondary lens 3 in the linear direction. Specifically, the second motor 421 drives the second worm 423 to rotate around its axis, so that the worm wheel meshing with the second worm 423 can rotate around its axis, and the second screw 424 is connected to the second worm wheel 422 by a thread, and the rotating second worm wheel 422 changes the screwing position with the second screw 424, and the second worm wheel 422 generally has only the degree of freedom around its axis to achieve meshing with the second worm 423, so the second screw 424 moves in the linear direction under the drive of the second worm wheel 422, so as to drive the secondary lens 3 to move.

[0081] In the embodiment of the present application, the second screw 424 and the back side of the secondary lens 3 are connected via a ball head support, so that when the second screw 424 can drive the secondary lens 3 to move in the horizontal direction, it can rotate around the first linear drive component 41, and the first linear drive component 41 can also be used as a fulcrum for the secondary lens 3 to rotate when driving the secondary lens 3 to move in the horizontal direction.

[0082] In some of the embodiments of this application, Figure 2 As shown, the first linear drive component 41 includes a first motor 411, a first worm gear 412, a first worm 413 and a first screw 414. The first motor 411 is connected to the first worm 413 in driving connection, the outer side of the first worm gear 412 is meshed with the first worm 413, the inner side of the first worm gear 412 is threadedly connected to the first screw 414, and one end of the first screw 414 is connected to the back side of the secondary lens 3. The second linear drive component 42 includes a second motor 421, a second worm gear 422, a second worm 423 and a second screw 424. The second motor 421 is connected to the second worm 423 in driving connection, the outer side of the second worm gear 422 is meshed with the second worm 423, the inner side of the second worm gear 422 is threadedly connected to the second screw 424, and one end of the second screw 424 is connected to the back side of the secondary lens 3.

[0083] In the embodiment of the present application, the position where the first screw 414 is connected to the back of the secondary lens 3 and the position where the second screw 424 is connected to the back of the secondary lens 3 may be in the same horizontal plane, or may not be in the same horizontal plane.

[0084] In some embodiments of the present application, the rearview mirror includes a transition lens 5 , and the transition lens 5 is located between the main lens 1 and the auxiliary lens 3 .

[0085] It is understandable that the transition lens 5 can transition the fields of view of the main lens 1 and the auxiliary lens 3 so that the field of view displayed by the rearview mirror has continuity, thereby reducing the interference to the driver caused by the different fields of view of the main lens 1 and the auxiliary lens 3.

[0086] In the embodiment of the present application, one side of the transition lens 5 is connected to the secondary lens 3, and the other side is connected to the main lens 1, and the two sides are opposite sides. In this way, the secondary lens 3 can drive the secondary lens 3 to undergo elastic deformation when rotating, which is conducive to reducing the interference caused by the different fields of view between the main lens 1 and the secondary lens 3.

[0087] In some embodiments of the present application, the ratio of the area of ​​the main lens 1 , the area of ​​the transition lens 5 , and the area of ​​the secondary lens 3 is 9:1:5.

[0088] It can be understood that the main lens 1 is fixed on the rearview mirror to provide the driver with the main field of vision. Its larger area is conducive to the driver's stable rear field of vision. The transition lens 5 plays a transition role, so its area is the smallest. The auxiliary lens 3 plays a function of adjusting the driver's field of vision, so it has an area larger than the transition lens 5 but smaller than the main lens 1. In order to maintain the normal function of the rearview mirror, the area of ​​the main lens 1 is arranged to be larger than half of the sum of the three.

[0089] In the embodiment of the present application, the housing 2 has an opening for supporting the main lens 1, the transition lens 5 and the secondary lens 3, and the sum of the areas of the main lens 1, the transition lens 5 and the secondary lens 3 is equal to the area of ​​the opening.

[0090] The second aspect of the present application provides a control method for a rearview mirror, such as Figure 4 As shown, the control method of the rearview mirror is applied to the rearview mirror as in the embodiment, and the control method includes:

[0091] 100: Determine whether the car has a tendency to turn;

[0092] 201: If the car has a tendency to turn, the rotation mechanism 4 is controlled to change the size of the angle according to the turning center angle;

[0093] 202: If the vehicle has no turning tendency, the control rotation mechanism 4 does not work.

[0094] It is understandable that when the car is turning, the driver's rear view is blocked by the B-pillar and other body structures. At this time, the rotation mechanism 4 is controlled to change the angle of the secondary lens 3 so that the people and objects that were originally blocked can be observed by the driver, thereby reducing the driver's field of vision restrictions.

[0095] In the embodiment of the present application, the turning center angle may refer to the angle formed by the length direction of the vehicle body before and after turning.

[0096] In the embodiment of the present application, the turning center angle can be obtained by the rotation angle of the steering wheel. For example, when the steering wheel rotates 180°, the turning center angle is 90°.

[0097] In some embodiments of the present application, controlling the rotation mechanism 4 to change the size of the angle according to the turning center angle specifically includes:

[0098] 2011: Determine the relative position of the rearview mirror and the center angle of the turning circle.

[0099] It is understandable that when the rearview mirror is located on the inner and outer sides of the turning center angle, the obstruction is different. Determining the positional relationship between the rearview mirror and the turning center angle is conducive to the rotation mechanism 4 driving the secondary lens 3 to provide more appropriate adjustment, which can reduce the field of vision restriction on the driver.

[0100] In some of the embodiments of this application, Figure 5 and Figure 7 As shown, controlling the rotation mechanism 4 to change the size of the angle according to the turning center angle specifically includes:

[0101] 2012: If the rearview mirror is located on the inside of the center angle of the turning circle, then:

[0102] If the turning circle center angle ranges from 15 to 45°, the angle of the included angle changes by 4°;

[0103] If the turning circle center angle ranges from 46 to 70°, the angle of the included angle changes by 7°;

[0104] If the turning circle center angle ranges from 71 to 90°, the angle of the included angle changes by 0°;

[0105] 2013: If the rearview mirror is outside the center of the turning circle, then:

[0106] If the turning circle center angle ranges from 15 to 45°, the angle of the included angle changes by 4°;

[0107] If the center angle of the turning circle ranges from 46 to 70°, the angle of the included angle changes by 5°;

[0108] If the turning center angle ranges from 71° to 90°, the angle change is 0°.

[0109] It can be understood that, within the above value range, the driver can obtain a relatively suitable field of view when turning, which can reduce the blocking effect of the vehicle body on the driver's field of view.

[0110] In some of the embodiments of this application, Figure 6 As shown, determine whether the car has a tendency to turn, including:

[0111] 101: Get the speed of the car;

[0112] 102: If the speed of the car is greater than 25 km / h, it is determined that the car has no tendency to turn;

[0113] 103: If the speed of the car is less than 25 km / h, it is determined that the car has a tendency to turn.

[0114] It is understandable that when the vehicle speed is ≤25km / h, the adaptive adjustment of the exterior mirrors begins to follow the vehicle's turning, which can help the driver expand his field of vision when turning. When the vehicle speed is greater than 25km / h, the car is at a relatively high speed, and observing the rearview mirror for a long time does not comply with traffic safety regulations, so it is meaningless to provide adaptive adjustment of the exterior mirrors.

[0115] In some embodiments of the present application, determining whether the vehicle has a tendency to turn further includes:

[0116] Get the status of the turn signal;

[0117] If the turn signal is in working state and the indicated turning direction is consistent with the turning center angle, it is determined that the car has a turning tendency;

[0118] If the turn signal is in working state, and the directions of the indicated turning circle angles are inconsistent, and the angle of the turning circle center angle is greater than 15°, it is determined that the vehicle has a tendency to turn;

[0119] If the turn signal is not in working state and the center angle of the turning circle is greater than 15°, it is determined that the car has a tendency to turn.

[0120] It is understandable that the working state of the turn signal lamp as a component indicating the direction of the turn can be used to determine whether the driver intends to turn the steering wheel. By determining the working state of the turn signal lamp, the present method can improve the working accuracy of the rotation mechanism 4. In addition, in order to reduce the situation where the driver accidentally touches the turn signal lamp and causes the present method to misjudge, adding the judgment of the turning center angle is conducive to improving the working accuracy of the rotation mechanism 4.

[0121] In this application, the terms "primary" and "secondary" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless otherwise clearly defined.

[0122] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the present application disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only.

[0123] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A rearview mirror, characterized in that: The rearview mirror comprises a main lens (1), a housing (2), a secondary lens (3) and a rotating mechanism (4), wherein: The main lens (1) is fixed to the housing (2); The secondary lens (3) is mounted on the housing (2); The rotating mechanism (4) is connected to the auxiliary lens (3) in a transmission manner and is used to drive the auxiliary lens (3) to rotate so as to change the angle formed by the normal plane of the auxiliary lens (3) and the initial normal plane, wherein the auxiliary lens (3) is a curvature lens and the initial normal plane is the normal plane of the auxiliary lens (3) in an initial position.

2. The rearview mirror according to claim 1, characterized in that: The rotating mechanism (4) comprises a first linear drive component (41) and a second linear drive component (42), wherein the first linear drive component (41) and the second linear drive component (42) are both connected to the back surface of the secondary lens (3) and are used to respectively drive the secondary lens (3) to move in a horizontal direction.

3. The rearview mirror according to claim 2, characterized in that: The first linear drive assembly (41) comprises a first motor (411), a first worm wheel (412), a first worm (413) and a first screw (414); the first motor (411) is connected to the first worm (413) by transmission; the outer side of the first worm wheel (412) is meshed with the first worm (413); the inner side of the first worm wheel (412) is threadedly connected to the first screw (414); one end of the first screw (414) is connected to the back side of the secondary lens (3); and / or, The second linear drive assembly (42) comprises a second motor (421), a second worm wheel (422), a second worm (423) and a second screw (424); the second motor (421) is connected to the second worm (423) by transmission; the outer side of the second worm wheel (422) is meshed with the second worm (423); the inner side of the second worm wheel (422) is threadedly connected to the second screw (424); and one end of the second screw (424) is connected to the back side of the secondary lens (3).

4. The rearview mirror according to claim 1, characterized in that: The rearview mirror comprises a transition lens (5), wherein the transition lens (5) is located between the main lens (1) and the auxiliary lens (3).

5. The rearview mirror according to claim 4, characterized in that: The ratio of the area of ​​the main lens (1), the area of ​​the transition lens (5) and the area of ​​the secondary lens (3) is 9:1:

5.

6. A method for controlling a rearview mirror, characterized in that: The control method of the rearview mirror is applied to the rearview mirror according to any one of claims 1 to 5, and the control method comprises: Determine if the car has a tendency to turn; If the automobile has a tendency to turn, the rotation mechanism (4) is controlled to change the size of the angle according to the center angle of the turning circle; If the automobile has no turning tendency, the rotating mechanism (4) is controlled not to work.

7. The method for controlling a rearview mirror according to claim 6, characterized in that: The step of controlling the rotating mechanism (4) to change the size of the angle according to the turning center angle further comprises: The relative position relationship between the rearview mirror and the turning center angle is determined.

8. The method for controlling a rearview mirror according to claim 7, characterized in that: The step of controlling the rotating mechanism (4) to change the size of the angle according to the turning center angle specifically includes: If the rearview mirror is located inside the center angle of the turning circle, then: If the turning center angle ranges from 15 to 45°, the angle of the included angle changes by 4°; If the turning center angle ranges from 46° to 70°, the angle of the included angle changes by 7°; If the turning center angle ranges from 71° to 90°, the angle of the included angle is changed by 0°; If the rearview mirror is located outside the center angle of the turning circle, then: If the turning center angle ranges from 15 to 45°, the angle of the included angle changes by 4°; If the turning center angle ranges from 46° to 70°, the angle of the included angle is changed by 5°; If the turning center angle ranges from 71° to 90°, the angle of the included angle is changed by 0°.

9. The method for controlling a rearview mirror according to claim 6, characterized in that: The step of determining whether the vehicle has a turning tendency specifically includes: Obtaining the speed of the vehicle; If the speed of the vehicle is greater than 25 km / h, it is determined that the vehicle has no turning tendency; If the vehicle speed of the vehicle is less than 25 km / h, it is determined that the vehicle has a turning tendency.

10. The method for controlling a rearview mirror according to claim 6, characterized in that: The determining whether the vehicle has a turning tendency specifically includes: Get the status of the turn signal; If the turn signal lamp is in working state and the indicated turning direction is consistent with the turning center angle, it is determined that the vehicle has a turning tendency; If the turn signal lamp is in working state and the directions of the indicated turning circular angles are inconsistent, and the angle of the turning center angle is greater than 15°, it is determined that the vehicle has a turning tendency; If the turn signal lamp is not in working state and the angle of the turning center angle is greater than 15°, it is determined that the vehicle has a turning tendency.

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