JP4980404B2 - Vehicle door mirror - Google Patents

Description

  The present invention relates to a vehicle door mirror that is provided at a side portion of a vehicle body and projects the vehicle body rear side and the vehicle body side.

2. Description of the Related Art As vehicle door mirrors, those equipped with a plane mirror or a curved mirror with a curvature (convex mirror) are known.
This type of vehicle door mirror, for example, in some areas where the driver's seat side door mirror is obligated to adopt a plane mirror by law, and was designed as appropriate according to the legislation and model of the area where the vehicle is operated .
As such a vehicle door mirror, a vehicle door having a wider field of view below the vehicle is known (see, for example, Patent Document 1).

  The vehicle door mirror of Patent Document 1 is provided with a gradually changing curvature curved surface portion whose radius gradually decreases toward the lower side of the single curvature curved surface portion, and the single curvature curved surface portion and the gradually changing curvature curved surface portion are visually distinguished. The composite curved mirror is configured so that the single curved surface portion reflects the rear of the vehicle and the gradually changing curved surface portion reflects the vicinity of the rear wheel of the vehicle.

That is, it is disclosed that in the vehicle door mirror, the rate of change of the curvature of the gradually changing curvature curved surface portion in the vertical direction in the width direction (longitudinal direction) is larger on the vehicle exterior side than on the vehicle interior side of the door mirror.
In a vehicular door mirror having a general curved surface with a curvature-inflection curvature, it is also known that the rate of change in curvature of the curved surface with a curvature-changing curvature is constant in the width direction (longitudinal direction) of the door mirror.

In general, the following is known as the mechanism of human eye imaging. For example, the case where a plane mirror is used for the vehicle door mirror will be described as an example. When the lower object is viewed with the right eye and the left eye, the position where the object is reflected on the vehicle door mirror is different between the right eye and the left eye. In the horizontal direction, the right eye appears outside and the left eye appears inside. In the vertical direction, the right eye appears on the upper side and the left eye appears on the lower side. When combining the images of the right eye and the left eye reflected on the plane mirror, the images are aligned in the direction of a straight line passing through the left and right eyes by tilting the neck, and then the two images are combined. That is, two actions are performed.
In addition, a curved mirror, not a plane mirror, has a property that an image of an object is compressed in accordance with the curvature, and the position where the image appears approaches the center of the mirror surface.

  However, in a vehicular door mirror having a general curved surface with a variable curvature of curvature, a gradually varying curvature curved surface portion having a radius gradually decreasing toward the lower side of the single curved curved surface portion is provided. Unlikely, imaging becomes difficult. That is, the position of the right eye image and the left eye image in the vertical direction are different, and the curvature at that position is also different, so the shape of the image is also different.

  Further, as in the vehicle door mirror of Patent Document 1, when the rate of change of the curvature of the gradually changing curved surface portion in the vertical direction is larger on the vehicle exterior side than the vehicle interior side of the door mirror, the curvature change rate on the vehicle exterior side is large. The image moves upward. That is, the vertical displacement between the right eye and the left eye increases, and the amount of tilting the neck increases. Therefore, it is estimated that the time required for the combination of both eyes is further increased.

JP-A-9-178922

  It is an object of the present invention to provide a vehicle door mirror that can shorten the time required for binocular imaging when a vehicle door mirror having a gradually changing curvature portion whose curvature changes continuously is adopted. And

  The invention according to claim 1 is a vehicle door mirror including a gradually changing curvature portion that extends in the vehicle width direction and continuously changes in curvature so that the curvature increases from the top to the bottom. The change rate of the curvature in the up-down direction of the gradually changing curvature portion is set to be larger on the vehicle inner side than on the vehicle outer side in the vehicle width direction.

  The invention according to claim 2 is characterized in that the rate of change of the curvature in the vehicle width direction of the gradually changing curvature portion is changed at a constant rate.

  The invention according to claim 3 is characterized in that the rate of change of curvature in the vehicle width direction of the gradually changing curvature portion is changed in accordance with a logarithmic function with respect to the distance from the end portion on the vehicle inner side in the vehicle width direction.

The present invention has the following effects.
In the invention according to claim 1, the vehicle door mirror includes a gradually changing curvature portion that extends in the vehicle width direction and continuously changes in curvature so that the curvature increases from the upper side to the lower side.
The rate of change in the vertical curvature of the gradually changing curvature is set to be larger on the inside of the vehicle than on the outside of the vehicle in the vehicle width direction. It is possible to reduce the shift in the vertical position between the image and the image viewed with the left eye. As a result, the time required for image formation of both eyes can be shortened.
Usually, the inside of the gradual curvature part is used to grasp the positional relationship between the rear part of the vehicle and the object outside the vehicle, especially when the vehicle is parked, and the outside of the vehicle is a vehicle that travels on the road lane or an adjacent lane when traveling. Used to recognize.
Since the curvature in the vehicle width direction is larger on the inside of the vehicle and smaller on the outside of the vehicle, the image that appears on the inside of the gradually changing curvature portion is wider than the image that appears on the outside of the gradually changing curvature portion. Will be compressed in the direction. As a result, an object in the vicinity of the vehicle can be projected closer to the vehicle on the inner side of the vehicle, and a wider range of objects can be recognized at a time without moving the line of sight. In addition, since image compression can be reduced outside the vehicle, bending of the road lane in the vehicle width direction can be suppressed.

  In the invention which concerns on Claim 2, the change rate of the curvature in the vehicle width direction of the gradually changing curvature part was changed by the fixed ratio. As a result, when a straight object having a component in the vehicle width direction is projected by the gradual curvature portion, it can be projected while maintaining the linear shape, so that the driver can easily recognize the object.

  In the invention which concerns on Claim 3, the change rate of the curvature in the vehicle width direction of a gradually changing curvature part was changed according to the logarithmic function with respect to the distance from the edge part inside a vehicle in a vehicle width direction. As a result, an object in the vicinity of the vehicle can be projected closer to the vehicle on the vehicle interior side, and a wider range of objects can be recognized at a time without moving the line of sight. In addition, since the image compression can be further reduced outside the vehicle, bending of the road lane in the vehicle width direction can be suppressed.

It is a top view of the vehicle by which the door mirror for vehicles concerning the present invention was adopted. It is a principle figure which shows that there is a distance difference in the left-right direction between the left eye and the right eye. It is a principle figure which shows that there is a distance difference in the up-down direction between the left eye and the right eye. It is explanatory drawing of the door mirror for vehicles which concerns on this invention. FIG. 5 is an operation explanatory view of the vehicle door mirror shown in FIG. 4. It is explanatory drawing which shows the 1st curvature setting method of the door mirror for vehicles shown by FIG. It is a comparative examination figure of the door mirror for vehicles concerning the present invention. It is explanatory drawing of the door mirror for vehicles of Example 2 which concerns on this invention. It is explanatory drawing of the door mirror for vehicles of Example 3 which concerns on this invention. FIG. 10 is an operation explanatory diagram of the vehicle door mirror shown in FIG. 9.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

As shown in FIG. 1, the vehicle 10 includes door mirror units 13 and 13 on the left and right. The left door mirror unit 13 includes a mirror stay 14 attached to the vehicle body 11 side, a mirror housing 15 attached to the mirror stay 14 in a tiltable manner, and a vehicle door mirror 30 attached to the mirror housing 15 so as to be swingable (hereinafter referred to as a “door mirror 30”). , Abbreviated as “door mirror 30”).
The left (passenger side) door mirror unit 13 is symmetrical with the right (driver side) door mirror unit 13 with respect to the center of the vehicle body.

The driver's left and right eye points 18 and 19 are located behind the left and right door mirrors 30 and 30 (one not shown). For example, it can be seen in plan view that the distance from the left eye point (left eye) 18 to the left door mirror 30 is different from the distance from the right eye point (right eye) 19 to the right door mirror 30.
Further, “front and rear”, “left and right” and “up and down” are based on the vehicle 10. “Vehicle inside” and “Vehicle outside” are inside and outside of the passenger compartment 12.

  First, the principle when a human visually recognizes an object will be described. That is, when a human visually recognizes the object 25 (see FIG. 2) with the left eye 18 and the right eye 19, there is a difference in distance to the object 25 in the horizontal direction and the vertical direction. Here, a door mirror is demonstrated as a plane mirror.

  FIG. 2A shows a front view of the door mirror 21 of the plane mirror. The one-dot chain line on the left of the drawing is the line of sight 23 of the human left eye 18, and the one-dot chain line on the right of the drawing is the line of sight 24 of the human right eye 19. FIG. 2B shows a principle diagram when the door mirror 21 is viewed from above the paper surface of FIG.

There is a pupil distance S between the human left eye 18 and the right eye 19. An object (real image) 25 is visually recognized by the left eye 18 and the right eye 19 through the door mirror 21. The virtual image 26 of the object 25 is located behind the door mirror 21.
Here, the distance from the left eye 18 to the door mirror 21 is L1, the distance from the door mirror 21 to the real image (object) 25 is L2, the distance from the right eye 19 to the door mirror 21 is R1, and the distance from the door mirror 21 to the real image (object) 25 is Is the distance R2. L1 + L2 and R1 + R2 are different. That is, when viewing the same real image, the left eye 18 and the right eye 19 have different viewing positions in the left-right direction (vehicle width direction).
The difference between the left eye 18 and the right eye 19 that is visually recognized in the left-right direction (vehicle width direction) is called a left-right visual difference.

  FIG. 3A shows a front view of the door mirror 21 of the plane mirror. The one-dot chain line on the left of the drawing is the line of sight 23 of the human left eye 18, and the one-dot chain line on the right of the drawing is the line of sight 24 of the human right eye 19. FIG. 3B shows a side view of the door mirror 21.

There is a pupil distance S shown in FIG. 2B between the human left eye 18 and the right eye 19. An object (real image) 25 is visually recognized by the left eye 18 and the right eye 19 through the door mirror 21. The virtual image 26 of the object 25 is located behind the door mirror 21.
Here, the distance from the left eye 18 to the door mirror 21 is Lh1, the distance from the door mirror 21 to the real image (object) 25 is Lh2, the distance from the right eye 19 to the door mirror 21 is Rh1, and the distance from the door mirror 21 to the real image (object) 25. Is Rh2. Lh1 + Lh2 and Rh1 + Rh2 are different. That is, when viewing the same real image, the left eye 18 and the right eye 19 have different viewing positions in the vertical direction (height direction).
The difference in the visually recognizable position in the vertical direction (height direction) between the left eye 18 and the right eye 19 is referred to as a vertical visual difference.

Hereinafter, the door mirror 30 according to the present invention on the driver side (right side) will be described symmetrically.
The plane of the door mirror 30 is shown in FIG. FIG. 4B shows a cross-sectional view taken along the line bb of FIG. FIG. 4C shows a cross-sectional view taken along the line cc of FIG.
The door mirror 30 includes a fixed curvature portion 31 set to a predetermined curvature, and a gradually changing curvature portion 32 whose curvature continuously changes so as to increase from the top toward the bottom.

  The fixed curvature part 31 is formed in the upper part of the door mirror 30. The gradually changing curvature portion 32 extends in the vehicle width direction and is formed below the fixed curvature portion 31. The rate of change in curvature in the vertical direction is set to be greater on the vehicle inner side than on the vehicle outer side in the vehicle width direction.

  FIG. 5A shows the positions of the object (real image) 35 and the virtual image 36 viewed by the gradual curvature portion 32 when the door mirror 30 is viewed only by the left eye 18. FIG. 5B shows the positions of the object (real image) 35 and the virtual image 36 that are visually recognized by the gradual curvature portion 32 when the door mirror 30 is viewed only by the right eye 19.

FIG. 5C shows a mapping (viewing position) 37 of an object (real image) 35 that is visually recognized by the gradual curvature part 32 seen only by the left eye 18 and a gradual curvature part 32 seen only by the right eye 19. A mapping (viewing position) 38 of the visually recognized object (real image) 35 is shown.
Since the rate of change of the curvature in the vertical direction of the gradually changing curvature portion 32 is set to be larger on the vehicle inner side than on the vehicle outer side in the vehicle width direction, the straight line A4 connecting the maps 37 and 38 becomes substantially horizontal. As described with reference to FIGS. 2 and 3, when the gradual curvature portion 32 is a plane mirror, there is a difference in visual recognition between the left eye 18 and the right eye 19 (in the horizontal direction and the vertical direction). The connecting straight line A5 is diagonally lowered outward in the vehicle width direction.

Next, a method for setting the curvature of the gradually changing curvature unit 32 will be described.
As shown in FIG. 6, a horizontal line H <b> 1 parallel to the ground is set at the lower end of the door mirror 30. A perpendicular line V1 passing through the approximate center of the door mirror 30 is drawn perpendicular to the horizontal line H1. A reference point P1 is provided at a predetermined distance from the intersection Q1 between the horizontal line H1 and the perpendicular line V1. An extension E1 is drawn from the reference point P1 to the inside of the door mirror 30. An external line segment F1 is drawn from the reference point P1 to the outside of the door mirror 30. An angle formed between the extension line segment E1 and the external line segment F1 is defined as θ. A start line C1 of the gradual curvature portion 32 is drawn around the reference point P1. An end line S1 of the gradual curvature portion 32 is drawn around the reference point P1.

  When the intersection of the start line C1 and the extension E1 is G1, and the intersection of the end line S1 and the extension E1 is G2, the distance from the intersection G1 to the intersection G2 is b. When the intersection of the start line C1 and the outer line segment F1 is G3, and the intersection of the end line S1 and the outer line segment F1 is G4, the distance from the intersection G3 to the intersection G4 is also b.

  Here, the range surrounded by the intersections G1 to G4 is the curvature setting range W1 of the gradual curvature portion 32. Further, the curvature of the fixed curvature portion 31 is K, the curvature of the intersection G2 is α, and the curvature of the intersection G4 is β (α> β). Note that the intersection point G1 and the intersection point G3 are points on the start line C1 of the gradual curvature part 32, so the curvature is K. It should be noted that the curvature K, the curvature α, the curvature β, and the angle θ formed by the inner line segment E1 and the outer line segment F1 are constants.

The curvature Mγ between the line segment J1 rotated from the extension line E1 by the angle γ about the reference point P1 and the intersection point G5 of the end line S1 of the gradual curvature portion 32 is
Mγ = α + (β−α) γ / θ (1)
Can be expressed as Note that the angle γ is a variable.
That is, according to the angle from the extension E1 to the reference point P1, the curvature is set from the vehicle inner side to the vehicle outer side with a constant change rate as shown in Expression (1).

The curvature Ma at the intersection G6 between the arc A1 and the outer line segment F1 increased from the start line C1 of the gradually changing curvature portion 32 by the radius y around the reference point P1 is Ma = K + (β−K) y / b. (2)
Can be expressed as
That is, according to the distance from the start line C1 of the gradual curvature part 32, the curvature is changed at a constant change rate as shown in Expression (2).

7A to 7C show an imaging procedure of an object recognized by the left eye 18 (see FIG. 1) and the right eye 19. The door mirror 21 of the comparative example 1 is a plane mirror.
In (a), the map 27 is recognized by the left eye 18 and the map 28 is recognized by the right eye 19. As described above, since there is a difference in visual recognition between the left eye 18 and the right eye 19, the maps 27 and 28 are recognized by being shifted by a distance S4 in the vehicle width direction and shifted by a distance S5 in the vertical direction. .

  In (b), an error in the vertical direction is absorbed in the human brain accompanied by an unconscious action of tilting the human neck. Next, in (c), the left and right maps 27, 28 are imaged and recognized as one image 29.

The door mirror 100 of the comparative example 2 is shown by FIG.7 (d)-(f). The door mirror 100 is provided with a gradual curvature portion 102 that is set to have a constant curvature in the vehicle width direction and changes the curvature in the vertical direction.
In (d), the map 107 is recognized by the left eye 18 and the map 108 is recognized by the right eye 19. Similar to the plane mirror 21, since there is a difference in visual recognition between the left eye 18 and the right eye 19, the distance is recognized by being shifted by a distance S6 in the vehicle width direction and by a distance S7 in the vertical direction.

  In (e), an error in the vertical direction is absorbed in the human brain with an unconscious movement such as tilting the human neck. In this case, since the curvature is set in the gradually changing curvature portion 102, it takes time to absorb the error in the vertical direction as compared with the plane mirror 21 shown in (d). Next, in (f), the left and right maps 107 and 108 are formed and recognized as one image 109.

  The door mirror 30 of an Example is shown by FIG.7 (g)-(i). In (g), the map 37 is recognized by the left eye 18 (see FIG. 1), and the map 38 is recognized by the right eye 19. In this case, since the rate of change of the curvature in the vertical direction of the gradual curvature portion 32 is set larger on the vehicle inner side than the vehicle outer side in the vehicle width direction, the visual difference in the vertical direction is suppressed, and the left eye 18 and The maps 37 and 38 recognized by the right eye 19 are recognized substantially horizontally. Thereby, in (h), the time to absorb the error in the vertical direction in the human brain is shortened with the unconscious movement of tilting the human neck. Next, in (i), the left and right maps 37 and 38 are imaged and recognized as one image 39.

As shown in FIGS. 4 and 5, the door mirror 30 extends in the vehicle width direction and gradually changes in curvature so that the curvature increases from the upper side toward the lower side. 32.
Since the rate of change of the curvature in the vertical direction of the gradually changing curvature portion 32 is set to be larger on the vehicle inner side than on the vehicle outer side in the vehicle width direction, the right eye is used when viewing an object reflected in the gradually changing curvature portion 32. The shift in the vertical position between the map 38 viewed at 19 and the map 37 viewed with the left eye 18 can be reduced.
As a result, it is possible to shorten the time required for image formation of both eyes 18 and 19.

Usually, the inside of the gradual curvature portion 32 is used to grasp the positional relationship between the rear part of the vehicle and an object on the outside of the vehicle, particularly when the vehicle is parked, and the outside of the vehicle travels on a road lane or an adjacent lane when traveling. Used to recognize a car.
Since the curvature in the vehicle width direction is larger on the inner side of the vehicle and smaller on the outer side of the vehicle, the image reflected on the inner side of the gradually changing curvature portion 32 is more than the image reflected on the outer side of the gradually changing curvature portion 32. It will be compressed in the vehicle width direction.

  As a result, an object in the vicinity of the vehicle 10 (see FIG. 1) can be projected closer to the vehicle 10 on the inside of the vehicle, and a wider range of objects can be recognized at a time without moving the line of sight. In addition, since image compression can be reduced outside the vehicle, bending of the road lane in the vehicle width direction can be suppressed.

  In the door mirror 30, the rate of change of the curvature in the vehicle width direction of the gradually changing curvature portion 32 is changed at a constant rate. As a result, when a straight object having a component in the vehicle width direction is projected by the gradual curvature portion 32, it can be projected while maintaining the straight line shape, so that the driver can easily recognize the object.

  As shown in FIG. 8, the door mirror (vehicle door mirror) 40 includes a fixed curvature portion 41 and a gradual curvature portion 42, as with the door mirror 30 (see FIG. 4). The fixed curvature part 41 is formed in the upper part of the door mirror 40. The gradually changing curvature portion 42 extends in the vehicle width direction and is formed below the fixed curvature portion 41.

A method for setting the curvature of the gradual curvature unit 42 will be described.
A horizontal line H2 parallel to the ground is set at the lower end of the door mirror 40. An extension E2 is drawn on the inner side of the door mirror 40 so as to be orthogonal to the horizontal line H2. An outside line segment F2 is drawn outside the door mirror 40 so as to be orthogonal to the horizontal line H2. A start line C2 of the gradual curvature portion 42 is drawn in parallel with the horizontal line H2. An end line S2 of the gradually changing curvature portion 42 is drawn in parallel with the horizontal line H2.

When the intersection of the start line C2 and the extension E2 is N1, and the intersection of the end line S2 and the extension E2 is N2, the distance from the intersection N1 to the intersection N2 is b. When the intersection of the start line C2 and the outer line segment F2 is N3 and the intersection of the end line S2 and the outer line segment F2 is N4, the distance from the intersection N3 to the intersection N4 is also b. Let a be the distance from the intersection N1 to the intersection N3. The distance from the intersection N2 to the intersection N4 is also a.
Here, the range surrounded by the intersections N1 to N4 is the curvature setting range W2 of the gradual curvature portion 42.

  The curvature of the fixed curvature portion 41 is K, the curvature of the intersection N2 is α, and the curvature of the intersection N4 is β (α> β). Note that the intersection point N1 and the intersection point N3 are points on the start line C2 of the gradual curvature portion 42, so the curvature is K.

When the distance from the intersection N2 to the intersection N5 is x, the curvature Mx of the point N5 by the intersection N4 by the distance x from the intersection N2 is
Mx = α + (β−α) x / a (3)
Can be expressed as
That is, according to the distance from the extension E2, the curvature is set from the vehicle inner side to the vehicle outer side with a constant change rate as shown in the equation (3).
Note that the intersection N2 is a base point in the width direction of the gradual curvature portion 42 (end on the inner side of the vehicle), a is a set width of the gradual curvature portion 42, and x is a distance from the base point (distance from the end on the inner side of the vehicle). ).

The curvature My at the intersection N6 increased by y from the intersection N3 is My = K + (β−K) y / b (4)
Can be expressed as
The intersection N3 is the starting point in the height direction of the gradual curvature portion 42, y is the distance from the starting point of the gradual curvature portion 42, and b is the set length in the height direction of the gradual curvature portion 42. .
That is, according to the distance from the start line C2 of the gradually changing curvature portion 42, the curvature is changed at a constant change rate as shown in the equation (4).

  In FIG. 8, the start line C2 of the gradually changing curvature portion 42 is formed in a straight line. Since the curvature K of the fixed curvature portion 41 is small, even if the start line C2 of the gradual curvature portion 42 is set to a straight line, the concept of the gradual curvature portion 42 is established.

  As shown in FIG. 9, the door mirror (vehicle door mirror) 50 includes a fixed curvature portion 51 and a gradual curvature portion 52, similarly to the door mirror 40 (see FIG. 8). The fixed curvature portion 51 is formed on the upper portion of the door mirror 50.

The gradually changing curvature portion 52 extends in the vehicle width direction and is formed below the fixed curvature portion 51. The method of setting the curvature of the gradually changing curvature portion 52 is the same as that of the door mirror 40.
However, if the curvature of the intersection U5, which is the same as the intersection N5 of the door mirror 40, is Mu,
The curvature Mu is
Mu = α + (β−α) Tlogx / a (5)
It is expressed.
The expression (5) is a predetermined constant with a logarithmic function of x / a, the distance from the base point of the expression (3) given by the door mirror 40 (see FIG. 8) / the set width (x / a) of the gradually changing curvature portion. It is replaced with the one multiplied by T.
That is, it can be said that the door mirror (vehicle door mirror) 50 changes the curvature in accordance with a logarithmic function with respect to the distance from the inner end in the vehicle width direction.

  In the door mirror 50, the rate of change of the curvature in the vehicle width direction of the gradually changing curvature portion 52 is changed according to a logarithmic function with respect to the distance from the end portion on the vehicle inner side. Therefore, as shown in FIG. 10A, when parking, the white line 61 drawn on the parking lot reflected near the interior of the door mirror 50 can be recognized. Reference numeral 16 denotes a wheel (rear wheel). In other words, a wider range can be recognized. Further, as shown in FIG. 10 (b), the bending when the white line 62 drawn on the road reflected outside the door mirror 50 is seen is suppressed.

  That is, in the door mirror 50, the rate of change of the curvature in the vehicle width direction of the gradually changing curvature portion 52 is changed according to a logarithmic function with respect to the distance from the inner end portion. Specifically, the distance from the base point / the set width (x / a) of the gradual curvature portion was changed according to the logarithmic function of x / a. As a result, an object near the vehicle 10 (see FIG. 1) can be projected closer to the vehicle 10 on the vehicle interior side, and a wider range of objects can be recognized at a time without moving the line of sight. In addition, since the image compression can be further reduced outside the vehicle, bending of the road lane in the vehicle width direction can be suppressed.

  As shown in FIG. 4, the vehicle door mirror 30 according to the present invention is a mirror including a gradually changing curvature portion 32 whose curvature continuously changes. However, the present invention is not limited to this. Another mirror such as a plane mirror or a convex mirror may be combined with the mirror including the gradually changing curvature portion 32 in which the curvature changes.

  The vehicle door mirror according to the present invention is suitable for use in passenger cars such as sedans and wagons.

  30, 40, 50... Vehicle door mirror (door mirror), 31, 41, 51... Fixed curvature portion, 32, 42, 52.

Claims (3)

In the vehicle door mirror provided with a gradually changing curvature portion that extends in the vehicle width direction and continuously changes in curvature so that the curvature increases from the top to the bottom,
The vehicular door mirror characterized in that the rate of change of curvature in the vertical direction of the gradually changing curvature portion is set larger on the vehicle inner side than on the vehicle outer side in the vehicle width direction.   2. The vehicle door mirror according to claim 1, wherein a rate of change of curvature in the vehicle width direction of the gradually changing curvature portion is changed at a constant rate.   The change rate of the curvature in the vehicle width direction of the gradually changing curvature portion is changed according to a logarithmic function with respect to the distance from the end portion on the vehicle inner side in the vehicle width direction. Vehicle door mirrors.

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