JPH0552712U - Vehicle monitor display device - Google Patents

Abstract

(57) [Summary] [Purpose] Make sure the distance to the rear obstacle of the vehicle 1 is known and secure sufficient rear visibility. [Structure] A spot light of the laser 11 is emitted from a laser 11 arranged at a position separated from a monitor camera 1 at a rear end of a vehicle 2 by a preset distance to a photographing range a _{3 to} a ₇ of the monitor camera 1. The distance L ₀ to the position where the spot light is emitted, which is calculated based on the formulas (1) to (3),
Display L ₁ and L ₂ on the scale 12 of the monitor screen 4.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a vehicle monitor display device.

[0002]

[Prior Art]

 In recent years, it has become increasingly difficult to secure a rear view of a vehicle with a rearview mirror due to vehicle design, and it is expected that rearviewless cars will also emerge. Therefore, in order to secure the rear view of the vehicle, a vehicle equipped with a vehicle monitor display device having a monitor camera at the rear of the vehicle has been developed, and such vehicles are increasing.

In FIG. 8, a monitor camera 1 is arranged substantially in the center of the rear of a vehicle 2, and the monitor camera 1 can photograph the ground behind the vehicle 2 and objects on the ground, such as utility poles 3 and the like. As you can see, it is slightly downward. When the vehicle 2 moves back and the position of the monitor camera 1 changes from X to Y, the image changes as shown in (A) → (B) in FIG. 9 showing the monitor screen 4.

[0004]

[Problems to be solved by the device]

 By the way, in the conventional device, even if the rear side of the vehicle is photographed by the monitor camera 1, the distance information to the obstacle cannot be transmitted, and it is only possible to confirm the presence or absence of the obstacle on the monitor screen 4. The driver empirically senses the distance to the utility pole 3 while checking the rear view on the monitor screen 4 to check the safety, so the driver can sense the distance to the obstacle if he is not very skilled. There wasn't.

Further, in the conventional apparatus, the monitor camera 1 is fixed, the rear view is narrow, and the rear view relies on the rearview mirror. The present invention has been made in view of such conventional problems, and it is an object of the present invention to provide a vehicle monitor display device capable of ensuring a sufficient rear field of view by recognizing a distance to a rear obstacle. To aim.

[0006]

[Means for Solving the Problems]

 Therefore, the present invention provides a monitor display device for a vehicle, which secures a field of view behind a vehicle by photographing a subject behind the vehicle with a monitor camera arranged at the rear end of the vehicle and displaying the image of the subject on display means. Is provided at a rear portion of the vehicle at a position separated from the monitor camera by a preset distance, and is provided with a light emitting means for projecting a visible light ray within a photographing range of the monitor camera, and emits light with the monitor camera. A scale for displaying the distance to the position irradiated with light, which is determined based on the positional relationship with the means, is provided in the screen of the display means.

Further, in a vehicle monitor display device for securing a field of view behind a vehicle by photographing a subject behind the vehicle with a monitor camera arranged at a rear end of the vehicle and displaying an image of the subject on the display means. The monitor camera is configured to be variable in the shooting direction, and a control means for setting the shooting direction of the monitor camera is provided.

[0008]

[Action]

 According to the above configuration, visible light rays are projected within the photographing range of the monitor camera by the light emitting means which is separated from the monitor camera by a preset distance. The scale on the screen of the display means displays the distance to the position where the light is irradiated, and this distance is determined based on the positional relationship between the monitor camera and the light emitting means. Further, the irradiation position of the light projected by the light emitting device can be visually recognized in the display means, and the distance to the obstacle behind the vehicle can be known by reading the distance of the scale on the display means from the irradiation position.

Further, in the case where the photographing direction of the monitor camera is variable, the monitor camera is controlled by the control means and the photographing direction of the monitor camera is variably set, so that the rear of the vehicle can be viewed in a wide range.

[0010]

【Example】

 Each embodiment of the present invention will be described below with reference to FIGS. The same elements as those in FIGS. 8 and 9 are designated by the same reference numerals and the description thereof will be omitted. An embodiment of the first invention will be described. This is a display with a scale on the monitor screen to make it easier to grasp the distance to the rear obstacle.

In FIG. 1, the monitor camera 1 uses, for example, a wide-angle lens having a deep depth of field and capable of shooting a slightly downward wide range. At the rear of the vehicle 2, a laser 11 as a light emitting means is arranged at a lower position apart from the monitor camera 1 by a predetermined distance. The laser 11 projects a visible light ray, which is a spot light, within the photographing range of the monitor camera 1. The image photographed by the monitor camera 1 is displayed on a monitor screen 4 with a scale, which is a display means arranged in the vehicle 2, as shown in FIG. At this time, the position where the spot light of the laser 11 is emitted is visible as a light spot on the monitor screen 4, and the distance from the rear end of the vehicle 2 corresponding to the light spot position is displayed on the scale 12.

Next, the method of determining the scale will be described with reference to FIGS. In FIG. 3, laser light is projected from a light emitting source a ₀ of the laser 11 toward a certain point a ₁ on the ground. The monitor camera 1 is also directed toward the ground from the camera point P _0, and the shooting direction of the monitor camera 1 is the optical axis a ₀ -a _{1 of the} laser 11 and the visual field center line P ₀ -P _{1 of the} monitor camera 1. Is set so that the angle becomes an angle θ ₀ . The photographing range of the monitor camera ₁ on the optical axis a ₀ -a _{1 of the} laser 11 is intersection points a _{3 to} a ₇ , and the intersection point a ₂ with the perpendicular from the camera point P ₀ to the optical axis a ₀ -a _{1 of the} laser 11 is a _2. Then, the distances L ₁ , L ₀ , L ₂ from the intersection a ₂ to the intersections a ₄ , a ₅ , a ₆ on the optical axis a ₀ -a ₁ are calculated by the following equations.

L ₀ = L _SET / tan θ ₀ . ． ． (1) L ₁ = L _SET / tan θ ₁ . ． ． (2) L ₂ = L _SET / tan θ ₂ . ． ． (3) Here, L _SET is the length of the perpendicular line from the camera point P ₀ , and θ ₀ , θ ₁ , and θ ₂ are the optical axes a ₀ − at the intersection points a ₅ , a ₄ , and a _{6, respectively} . It is the angle between a ₁ and the camera point P ₀ . Since the length of the optical axis a ₀ -a ₁ of the laser 11 is longer than the length L _SET of the perpendicular, the distances L ₁ , L ₀ and L ₂ should be approximately the distance from the rear end of the vehicle 2. You can

On the other hand, when the photographing ranges a _{3 to} a ₇ of the monitor camera 1 are displayed on the monitor screen 4, the display range of the monitor screen 4 is perpendicular to the visual field center line P ₀ -P _{1 of the} monitor camera 1. If b ₀ −b ₁ is satisfied, the distances L ₁ , L ₀ , L ₂ correspond to points b ₃ , b ₄ , b ₂ in the display range b ₀ −b ₁ . Then, the distances L ₁ , L ₀ , L ₂ are displayed at the position of the scale 12 on the monitor screen 4 corresponding to the points b ₃ , b ₄ , b ₂ . In this way, the scale 12 is determined.

Next, the positional relationship between the vehicle 2 and the electric pole 3 as an obstacle behind the vehicle 2 will be described with reference to FIG. 5A is a diagram showing the positional relationship between the monitor camera 1, the laser 11, and the telephone pole 3 in each of the cases of (X), (Y), and (Z), and FIG. FIG. 4 is a diagram showing an image displayed on a monitor screen with scale 4 in which a distance of 20 to 120 cm is displayed in each case.

For example, when the electric pole 3 is located at the position (X), the electric pole 3 is slightly displayed above the screen on the monitor screen 4, and the laser beam is applied to the ground. In this case, the light spot position on the screen 4 irradiated with the laser beam is on the ground in front of the utility pole 3, and the value on the scale 12 on the right side of the light spot position of the laser 11 on the monitor screen 4 is set. It is confirmed that the utility pole 3 is more than 120 cm away from the rear end of the vehicle 2.

When the utility pole 3 is located at the position (Y), the utility pole 3 is irradiated with the spot light of the laser 11 on the monitor screen 4. Then, by reading the value of the scale 12 on the monitor screen 4 from the light spot position, it is confirmed that the distance from the rear of the vehicle 2 to the position where the laser light is irradiated is 120 cm. When the telephone pole 3 is at the (Z) position, it is similarly confirmed that the distance from the rear end of the vehicle 2 to the position where the laser beam is emitted is 20 cm.

As described above, when the vehicle 2 approaches the utility pole 3, which is a rear obstacle, the light spot position of the spot light of the laser 11 on the monitor screen 4 is displayed in the vertical display range b of the monitor screen 4.₀-B₁And the change information is the distance information L on the optical axis of the laser 11.₀, L₁, L₂And one-to-one correspondence. According to this structure, the photographing range a of the monitor camera 1 from the laser 11 arranged at a position which is separated from the monitor camera 1 at the rear end of the vehicle 2 by a preset distance.₃~ A ₇ The spot light of the laser 11 is projected onto the lens, and the distance L to the position irradiated with the spot light is calculated based on the equations (1) to (3).₀, L₁, L₂Is displayed on the scale 12 of the monitor screen 4, so that when the vehicle 2 approaches the rear obstacle, information on the change in the light spot position of the spot light of the laser 11 on the monitor screen 4 and the rear obstacle from the rear end of the vehicle 2 is displayed. There is a one-to-one correspondence with the distance information up to. Therefore, by reading the value of the scale 12 from the light spot position on the monitor screen 4, the distance from the rear end of the vehicle 2 to the rear obstacle can be known.

Instead of using spot light as in this embodiment, the laser 11 may be moved in accordance with the projection direction of the laser 11 to the left and right photographing directions of the monitor camera 1. By doing this, even if there is an obstacle at a position behind the vehicle in the left-right direction, the distance to the obstacle can be known. Next, an embodiment of the second invention will be described with reference to FIGS. This is a monitor camera arranged behind the vehicle that can change the shooting direction.

In FIG. 6 in which the photographing direction of the monitor camera 1 is manually set, the controller 21 for variably setting the photographing direction of the monitor camera 1 arranged at the rear end of the vehicle 2 is, for example, It is arranged near the monitor screen 4 in the vehicle 2. The controller 21 is provided with four push button switches 22a to 22d for changing the photographing direction of the monitor camera 1 vertically and horizontally. For example, in the case of changing the shooting direction of the monitor camera 1 from the shooting direction θ _a to the lower shooting direction θ _b in FIG. 7A, the lower push button switch 22c is pressed to change the shooting direction θ a in FIG. As described above, when the photographing direction of the monitor camera 1 is changed from θ _{c to} θ _d , the right push button switch 22b is pushed. When the push buttons 22a to 22d are pressed, the shooting direction of the monitor camera 1 is changed.

According to this configuration, the rear of the vehicle 2 can be viewed in a wide range by variably setting the shooting direction of the monitor camera 1. The shooting direction of the monitor camera 1 can be automatically set by the manual shift lever, the back gear position of the A / T inhibitor switch, or the turning angle detection device. Specifically, for example, by shifting the manual shift lever or the A / T inhibitor switch to the back gear position, the shooting direction of the monitor camera 1 is variably set downward, and the steering angle detection device or the like turns the steering wheel off. The angle is detected, and if the handle is turned to the right according to the turning angle of the handle, the shooting direction of the monitor camera 1 is variably set to the right, and if the handle is turned to the left, it is variably set to the left.

[0022]

[Effect of the device]

 As described above, according to the present invention, the visible light is projected within the photographing range of the monitor camera from the light emitting means provided at a position which is separated from the monitor camera at the rear end of the vehicle by a preset distance. Then, by displaying the distance to the position where the light is emitted, which is determined based on the positional relationship between the monitor camera and the light emitting means, on the scale of the display means, the light of the light emitting means is emitted when the vehicle approaches the rear obstacle. The light spot position change information and the distance information from the vehicle rear end to the rear obstacle correspond to each other. Therefore, by reading the scale value from the light spot position on the monitor screen, the distance from the rear end of the vehicle to the rear obstacle can be known.

Further, in the case where the shooting direction of the monitor camera is variable, the rear of the vehicle can be viewed in a wide range.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment according to a first invention.

FIG. 2 is a diagram of an image displayed on the monitor screen of FIG.

FIG. 3 is an explanatory diagram of the scale determination method of FIG.

FIG. 4 is a diagram showing scales and light spot positions on the monitor screen of FIG.

5 is an explanatory view of the operation of FIG.

FIG. 6 is a diagram showing an embodiment according to the second invention.

7 is an explanatory diagram of the operation of FIG.

FIG. 8 is a conventional explanatory diagram.

9 is a diagram of an image displayed on the monitor screen of FIG.

[Explanation of symbols]

 1 monitor camera 2 vehicle 3 utility pole 4 monitor screen 11 laser 12 scale

Claims (2)

[Scope of utility model registration request] 1. A monitor display device for a vehicle, which secures a field of view behind a vehicle by photographing a subject behind the vehicle with a monitor camera arranged at a rear end of the vehicle and displaying an image of the subject on a display means. The monitor camera and the light emitting means are provided in the rear part of the vehicle at a position separated from the monitor camera by a preset distance, and are provided with a light emitting means for projecting visible light rays within a photographing range of the monitor camera. A monitor display device for a vehicle, wherein a scale for displaying a distance to a position irradiated with light, which is determined on the basis of a positional relationship with, is provided in the screen of the display means. 2. A monitor display device for a vehicle, which secures a field of view behind a vehicle by photographing a subject behind the vehicle with a monitor camera arranged at a rear end of the vehicle and displaying an image of the subject on a display means. A monitor display device for a vehicle, wherein the monitor camera is configured to be variable in a shooting direction, and a control means for setting a shooting direction of the monitor camera is provided.