JP2021051178A - On-vehicle projection device - Google Patents

Abstract

To provide an on-vehicle projection device configured to draw a content with irradiation light from a projector arranged in a cabin that prevents the drawn content from being reflected on a wall surface around an own vehicle and the like.SOLUTION: A first polarizing filter 30 is arranged between a rear window 104 on which a diffusion material 106 is dispersed and a projector 20, and a second polarizing filer 40 whose polarizing direction is substantially perpendicular to that of the first polarizing filter 30 is affixed to an outer surface 104a of the rear window 104. The light that has hit the diffusion material 106 of the irradiation light from the projector 20 reaches the second polarizing filter 40 in the state where the polarization is collapsed and thus exits from a cabin without being shielded by the second polarizing filter 40, allowing a drawn content D to be seen from the outside of the cabin. On the other hand, the light that has not hit the diffusion material 106 is shielded by the second polarizing filter 40 and thus the drawn content D is prevented from being reflected on the peripheral wall surface and the like.SELECTED DRAWING: Figure 4

Description

The present invention relates to an in-vehicle projection device configured to draw on a window by irradiation light from a projector arranged in a vehicle interior.

Conventionally, a projection device configured to draw on a self-standing screen, a wall surface of a building, or the like by irradiation light from a projector has been known.

Further, in "Patent Document 1", a first polarizing filter is arranged on a display surface of a car navigation device arranged in a vehicle interior, and a second polarization having a polarization direction substantially orthogonal to that of the first polarizing filter is arranged on a rear window. An in-vehicle display system in which a filter is arranged is described.

Japanese Unexamined Patent Publication No. 10-51764

By adopting the in-vehicle display system described in the above-mentioned "Patent Document 1", it is possible to prevent the display surface of the car navigation device from being seen through the rear window from the following vehicle or the like.

On the other hand, apart from such an in-vehicle display system, a projected image is formed on the rear window by irradiation light from a projector arranged in the vehicle interior, and characters, symbols, etc. are drawn by this projected image. It is possible to indicate the intention of the own vehicle to the following vehicle or the like when the vehicle is running, or to call attention to the surroundings when the vehicle is moving backward or the like. Then, in order to realize this, it is conceivable to have a configuration in which a diffusing material for diffusing the irradiation light from the projector is dispersed in the rear window.

However, when such a configuration is adopted, among the light radiated from the projector to the rear window, the light that is not diffused by the diffusing material is transmitted through the rear window as it is. If there is, the drawn content may be reflected on the wall surface or the like, which may give a sense of discomfort to the surroundings.

Such a problem is a problem that can occur similarly even when drawing in a window other than the rear window.

The present invention has been made in view of such circumstances, and is an in-vehicle projection device configured to draw on a window by irradiation light from a projector arranged in a vehicle interior, in which the surroundings of the own vehicle are used. An object of the present invention is to provide an in-vehicle projection device capable of preventing the drawn contents from being reflected on a wall surface or the like.

The present invention is designed to achieve the above object by providing a configuration provided with a predetermined polarizing filter.

That is, the in-vehicle projection device according to the present invention is
In an in-vehicle projection device configured to draw on a window by irradiation light from a projector placed in the vehicle interior.
A diffusing material for diffusing the irradiation light from the projector is dispersed in the window or the translucent film attached to the window.
A first polarizing filter that polarizes the irradiation light from the projector in the first direction is arranged between the projector and the window.
The irradiation light from the projector is polarized in a second direction substantially orthogonal to the first direction at a position opposite to the first polarizing filter with respect to the window or the translucent film in which the diffuser is dispersed. It is characterized in that a second polarizing filter is arranged.

The specific configuration and arrangement of the "projector" is not particularly limited as long as it can be drawn by a projected image formed on a window or a translucent film by the irradiation light.

The specific arrangement of the "window" is not particularly limited as long as it is a vehicle window, and for example, a rear window, a side window, or the like can be adopted.

The specific configuration of the "diffusing material" such as its material and particle size is not particularly limited as long as it can diffuse the irradiation light from the projector.

The above-mentioned "diffusing material" is dispersed in the window or the translucent film, but when the diffusing material is dispersed in the window, the translucent film may not be attached to the window.

The specific arrangement of the "first polarizing filter" is not particularly limited as long as it is arranged between the projector and the window.

The specific arrangement of the "second polarizing filter" is not particularly limited as long as it is arranged at a position opposite to the first polarizing filter with respect to the window or the translucent film in which the diffuser is dispersed. Absent.

The in-vehicle projection device according to the present invention has a configuration in which a diffuser for diffusing the irradiation light from the projector is dispersed on a window or a translucent film attached to the window, and the projector and the window. A first polarizing filter that polarizes the irradiation light from the projector in the first direction is arranged between them, and is on the opposite side of the first polarizing filter with respect to the window or the translucent film in which the diffuser is dispersed. At the position, a second polarizing filter that polarizes the irradiation light from the projector in the second direction substantially orthogonal to the first direction is arranged, so that the following effects can be obtained.

That is, the irradiation light from the projector reaches the window or the translucent film in which the diffusing material is dispersed as the light polarized in the first direction by passing through the first polarizing filter. Then, a projected image is formed on the window or the translucent film by the light that hits the diffusing material, and drawing is performed by this projected image. At that time, the light diffused by the diffusing material reaches the second polarizing filter in a state where the polarization is broken, so that the light is emitted to the outside of the vehicle interior without being shielded by the second polarizing filter, so that the drawn content is outside the vehicle interior. It becomes visible from.

On the other hand, among the irradiation light from the projector that has reached the window or translucent film in which the diffuser is dispersed, the light that does not hit the diffuser is transmitted through the window or translucent film as the light polarized in the first direction. Since it reaches the second polarizing filter, it is shielded from light by the second polarizing filter. Therefore, it is possible to prevent the drawn contents from being reflected on the surrounding wall surface or the like.

As described above, according to the present invention, in the in-vehicle projection device configured to draw on the window by the irradiation light from the projector arranged in the vehicle interior, the drawing content is reflected on the wall surface or the like around the own vehicle. It is possible to prevent it from being stored. As a result, it is possible to prevent the surroundings from being uncomfortable.

Moreover, in the present invention, only the irradiation light from the projector that has passed through the first polarizing filter is shielded by the second polarizing filter, so that the original function as a window is not impaired. it can.

In the above configuration, when the diffusing material is further dispersed in the window, if the second polarizing filter is composed of a polarizing film attached to the outer surface of the window, the number of parts of the in-vehicle projection device can be increased. Can be minimized.

On the other hand, when the diffusing material is dispersed in a translucent film, the second polarizing filter is composed of a polarizing film attached to the inner surface of the window, and is transparent through the second polarizing filter. If the optical film is attached to the window, the in-vehicle projection device is provided by adding the second polarizing filter and the translucent film together with the projector and the first polarizing filter without modifying the configuration of the vehicle itself. Can be configured.

In the above configuration, if the first polarizing filter is further supported by the projector, the first polarizing filter can be made compact.

In the above configuration, further, when the window is a rear window, if a lens for causing curvature of field in the horizontal plane is arranged between the projector and the rear window, the following operation is performed. The effect can be obtained.

That is, when the window is a rear window, it is possible to secure a large drawing area and clearly indicate the intention of the own vehicle to the following vehicle or the like. However, in general, the projector is configured to form a projected image on a flat screen, whereas the rear window is configured to be convexly curved toward the rear of the vehicle in the vehicle width direction. .. Therefore, by arranging the above lens to cause curvature of field in the horizontal plane, it is possible to improve the sharpness of the drawn content formed as a projected image even when a general projector is used. ..

In the above configuration, if the configuration of the window or the translucent film in which the diffusing material is dispersed is prepared so that the transmittance is 30 to 70%, the function as a window can be ensured and the function from the outside of the vehicle interior can be ensured. It is possible to achieve both visibility of the drawn contents.

The figure which shows the vehicle which mounted the vehicle-mounted projection device which concerns on one Embodiment of this invention is seen from the rear side of a vehicle. (A) is a sectional view taken along line IIa-IIa of FIG. 1, and (b) is a detailed view of part b of (a). Detailed view of Part III of Fig. 1 A diagram similar to FIG. 2A showing the operation of the above embodiment. A diagram similar to FIG. 1 showing the operation of the above embodiment. The same figure as FIG. 2 which shows the 1st modification of the said embodiment. It is a figure which shows the 2nd modification of the said embodiment, (a) is the same figure as FIG. 2 (a), (b) is the same figure as FIG. 5, which shows the operation of the said 2nd modification. The figure which shows the vehicle-mounted projection apparatus which concerns on the 3rd modification of the said Embodiment by the position of the cross section of line VIII-VIII of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing a vehicle 100 equipped with an in-vehicle projection device 10 according to an embodiment of the present invention as viewed from the rear side of the vehicle. 2 (a) is a sectional view taken along line IIa-IIa of FIG. 1, and FIG. 2 (b) is a detailed view of part b of FIG. 2 (a). Further, FIG. 3 is a detailed view of Part III of FIG.

In these figures, the direction indicated by X is "forward" (that is, the front of the vehicle), the direction indicated by Y is "rightward", and the direction indicated by Z is "upward". The same applies to figures other than these.

The vehicle 100 to which the vehicle-mounted projection device 10 according to the present embodiment is mounted has a configuration in which the rear window 104 is mounted on the rear end opening 102a of the vehicle body 102.

The in-vehicle projection device 10 is configured to draw on the rear window 104 by the irradiation light from the projector 20 arranged in the vehicle interior.

That is, the in-vehicle projection device 10 is configured to draw characters, symbols, and the like by the projected image formed on the rear window 104 by the irradiation light from the projector 20, thereby drawing characters, symbols, and the like with respect to the following vehicle and the like when the vehicle is traveling. It is designed to indicate the intention of the own vehicle and to call attention to the surroundings when the vehicle is moving backward.

At that time, the irradiation light control of the projector 20 is performed based on a video signal from an in-vehicle camera (not shown), map information around the position of the own vehicle from the car navigation device, and the like.

The projector 20 is arranged at a position away from the center position of the lower end of the rear end opening 102a of the vehicle body 102 toward the front side, with the light emitting portion 20a facing diagonally upward rearward.

The rear window 104 is composed of a transparent panel made of tempered glass in which the diffuser 106 is dispersed. The diffusing material 106 is composed of, for example, spherical resin fine particles having an average particle diameter of about 1 to 100 μm. At that time, the rear window 104 is adjusted so that the transmittance for the irradiation light from the projector 20 is 30 to 70% (for example, about 50%) due to the dispersion of the diffusing material 106.

A first polarizing filter 30 that polarizes the irradiation light from the projector 20 in the vertical direction (that is, linearly polarized light in the vertical direction in the vibration direction) is arranged between the projector 20 and the rear window 104.

Specifically, the first polarizing filter 30 is composed of a polarizing plate arranged near the rear of the light emitting portion 20a of the projector 20. The first polarizing filter 30 is supported by the holder 32, and the holder 32 is supported by the housing of the projector 20.

A second polarizing filter 40 for horizontally polarizing the irradiation light from the projector 20 is arranged at a position opposite to the first polarizing filter 30 with respect to the rear window 104.

Specifically, the second polarizing filter 40 is composed of a polarizing film attached to the outer surface 104a of the rear window 104. The second polarizing filter 40 is attached over the entire outer surface 104a.

FIG. 4 is a diagram similar to FIG. 2A showing a state in which drawing is performed by the in-vehicle projection device 10. Further, FIG. 5 is a diagram similar to FIG. 1 showing how this drawing is performed.

As shown in FIGS. 4 and 5, the light emitted from the projector 20 is incident on the rear window 104 as light polarized in the vertical direction by passing through the first polarizing filter 30. Then, of the light incident on the rear window 104, the light that hits the diffuser 106 dispersed in the rear window 104 forms a projected image on the rear window 104, and drawing is performed by this projected image.

The light incident on the rear window 104, both the light that hits the diffuser 106 and the light that does not hit the diffuser 106, tends to be emitted from the rear window 104 to the outside of the vehicle interior through the second polarizing filter 40.

At that time, the light diffused by the diffusing material 106 reaches the second polarizing filter 40 in a state where the polarization is broken, so that the light is emitted to the outside of the vehicle interior without being shielded by the second polarizing filter 40, thereby causing the rear window. The content drawn on the 104 can be visually recognized from outside the vehicle interior. That is, when the rear window 104 is viewed from the rear side of the vehicle, the drawing content D (for example, the symbol of the right-pointing arrow) can be visually recognized as shown in FIG.

On the other hand, the light that does not hit the diffusing material 106 reaches the second polarizing filter 40 as the light polarized in the vertical direction, so that the light is blocked by the second polarizing filter 40 and is not emitted to the outside of the vehicle interior.

That is, since only the light forming the drawing content D is emitted to the outside of the vehicle interior as diffused light, the drawing content D may be reflected on the front window of the following vehicle, the wall surface arranged behind the vehicle 100, or the like. Absent.

Next, the action and effect of this embodiment will be described.

The vehicle-mounted projection device 10 according to the present embodiment has a configuration in which a diffuser 106 for diffusing the irradiation light from the projector 20 is dispersed in the rear window 104, and the projector 20 and the rear window 104 are used. A first polarizing filter 30 that polarizes the irradiation light from the projector 20 in the vertical direction (first direction) is arranged between them, and a first polarizing filter is provided with respect to the rear window 104 in which the diffuser 106 is dispersed. A second polarizing filter 40 that polarizes the irradiation light from the projector 20 in the horizontal direction (a second direction substantially orthogonal to the first direction) is arranged at a position opposite to the 30th. Such an action effect can be obtained.

That is, the irradiation light from the projector 20 reaches the rear window 104 in which the diffusing material 106 is dispersed as light polarized in the vertical direction by passing through the first polarizing filter 30. Then, a projected image is formed on the rear window 104 by the light that hits the diffusing material 106, and drawing is performed by this projected image. At that time, the light diffused by the diffusing material 106 reaches the second polarizing filter 40 in a state where the polarization is broken, so that the light is emitted to the outside of the vehicle interior without being shielded by the second polarizing filter 40. D becomes visible from outside the vehicle interior.

On the other hand, of the irradiation light from the projector 20 that reached the rear window 104 in which the diffusing material 106 was dispersed, the light that did not hit the diffusing material 106 passed through the rear window 104 as the light polarized in the vertical direction and was second. Since it reaches the polarizing filter 40, it is shielded from light by the second polarizing filter 40. Therefore, it is possible to prevent the drawing content D from being reflected on the surrounding wall surface or the like.

As described above, according to the present embodiment, in the in-vehicle projection device 10 configured to draw on the rear window 104 by the irradiation light from the projector 20 arranged in the vehicle interior, the drawing is performed on the wall surface or the like around the own vehicle. It is possible to prevent the content D from being reflected. As a result, it is possible to prevent the surroundings from being uncomfortable.

Moreover, in the present embodiment, only the irradiation light from the projector 20 that has passed through the first polarizing filter 30 is shielded from light by the second polarizing filter 40, so that the original function as the rear window 104 is impaired. Can be avoided.

In the present embodiment, since the first polarizing filter 30 is supported by the projector 20, the first polarizing filter 30 can be made compact.

Further, in the present embodiment, since the window in which the drawing is performed by the irradiation light from the projector 20 is the rear window 104, a large drawing area can be secured and the manifestation of intention of the own vehicle to the following vehicle or the like is clarified. Can be done.

In the present embodiment, the diffusing material 106 is dispersed in the rear window 104, and the second polarizing filter 40 is composed of a polarizing film attached to the outer surface 104a of the rear window 104. The number of parts of the in-vehicle projection device 10 can be minimized.

At that time, since the rear window 104 in which the diffusing material 106 is dispersed is prepared so that the transmittance is 30 to 70%, the function as the rear window 104 is ensured and the drawing content D is visually recognized from the outside of the vehicle interior. It is possible to achieve both sex and sex.

That is, the brightness of the rear view of the vehicle 100 is reduced to 30 to 70% due to the presence of the diffusing material 106, and is further halved by the attachment of the second polarizing filter 40. Brightness of about 15 to 35% will be secured.

On the other hand, the irradiation light from the projector 20 is diffused by the diffuser 106 dispersed in the rear window 104 in a state where the brightness is substantially halved by the first polarizing filter 30, and then outside the vehicle interior via the second polarizing filter 40. Although the brightness is further halved when the light is emitted to the projector, the brightness of the drawing content D should be about 25% of the brightness when the first and second polarizing filters 30 and 40 are not present. It becomes.

In the above embodiment, it has been described that the first polarization direction is set in the vertical direction and the second polarization direction is set in the horizontal direction, but conversely, the first polarization direction is set. It is also possible to have a configuration in which the second polarization direction is set in the vertical direction while being set in the horizontal direction, and the first polarization direction and the second polarization direction are set in diagonal directions orthogonal to each other. It is also possible to have a configured configuration.

In the above embodiment, the in-vehicle projection device 10 is used for the purpose of indicating the intention of the own vehicle to the following vehicle or the like when the vehicle is running, or calling attention to the surroundings when the vehicle is moving backward or the like. As described above, it is also possible to use the vehicle for other purposes (for example, to function as a welcome lamp that lights up when the driver approaches or leaves a parked vehicle).

Next, a modified example of the above embodiment will be described.

First, a first modification of the above embodiment will be described.

FIG. 6 is a diagram similar to FIG. 2 showing the vehicle-mounted projection device 110 according to the present modification.

As shown in FIG. 6, the in-vehicle projection device 110 according to the present modification also has the same basic configuration as that of the above embodiment, but in the present modification, the second polarizing filter 140 has a rear window. The rear window 204 is composed of a polarizing film attached to the inner surface 204b of 204, and the diffuser 152 is dispersed in the translucent film 150 attached to the second polarizing filter 140. Is different from the case of the above embodiment in that the diffusing material is not dispersed in the above-mentioned embodiment.

The second polarizing filter 140 and the translucent film 150 are attached over substantially the entire inner surface 204b of the rear window 204.

Even when the configuration of this modification is adopted, the same action and effect as in the case of the above embodiment can be obtained.

Further, by adopting the configuration of this modification, the vehicle-mounted projection device 110 can be configured without modifying the configuration of the vehicle itself.

Next, a second modification of the above embodiment will be described.

7A and 7B are views showing the vehicle-mounted projection device 210 according to the present modification, FIG. 7A is the same as FIG. 2A, and FIG. 7B is the same as FIG. It is a figure.

As shown in FIG. 7, the basic configuration of the vehicle-mounted projection device 210 according to the present modification is the same as that of the first modification, but in the present modification, the second polarizing filter 240 and the translucent light are transmitted. The film 250 is different from the case of the first modification in that the film 250 is partially attached to the lower central region of the rear window 204, not the entire inner surface 204b.

Along with this, the projector 220 of the present modification is configured to form a projection image on the translucent film 250 in a state of being arranged closer to the rear window 204 than the projector 20 of the first modification. Has been done.

Also in this modification, the irradiation light from the projector 220 that has passed through the first polarizing filter 30 reaches the translucent film 250 as light polarized in the vertical direction. At that time, a projected image is formed on the translucent film 250 by the light hitting the diffusing material 252, drawing is performed by this projected image, and the drawing content D becomes visible from the outside of the vehicle interior. On the other hand, the light that does not hit the diffusing material 252 is shielded by the second polarizing filter 240 as light polarized in the vertical direction, so that the drawing content D is prevented from being reflected on the surrounding wall surface or the like. ..

Therefore, even when the configuration of the present modification is adopted, the same action and effect as in the case of the above embodiment can be obtained.

Further, in this modification, the second polarizing filter 240 and the translucent film 250 are partially attached to the lower central region of the inner surface 204b of the rear window 204, so that the rear view of the vehicle 200 is sufficiently secured. The above-mentioned action and effect can be obtained.

Next, a third modification of the above embodiment will be described.

FIG. 8 is a diagram showing the vehicle-mounted projection device 310 according to the present modification at the position of the cross section taken along the line VIII-VIII of FIG.

As shown in FIG. 8, the vehicle-mounted projection device 310 according to the present modification also has the same basic configuration as that of the above embodiment, but in the present modification, the projector 20 and the first polarizing filter 30 are used. It is different from the case of the above embodiment in that a lens 360 for causing curvature of field in the horizontal plane is additionally arranged between the and.

The lens 360 has a convex meniscus lens-like horizontal cross-sectional shape and is formed so as to extend in the vertical direction. The lens 360 is supported by a holder 332 that supports the first polarizing filter 30.

By adopting the configuration of this modification, the following effects can be obtained.

That is, in general, the projector 20 is configured to form a projected image on a flat screen, whereas the rear rear window 104 is curved so as to be convexly curved toward the rear of the vehicle in the vehicle width direction. It is formed.

Therefore, if the lens 360 is arranged as in this modification so that the projected image formed by the irradiation light from the projector 20 is curved in the horizontal plane, it is general as the projector 20. Even when a projector is used, the sharpness of the drawing content D formed as a projected image can be improved.

In the third modification, the lens 360 has been described as having a convex meniscus lens-like horizontal cross-sectional shape and extending in the vertical direction, but if it can cause curvature of field in the horizontal plane, , It is also possible to have a shape other than this.

It should be noted that the numerical values shown as specifications in the above-described embodiment and its modified examples are only examples, and it goes without saying that these may be set to different values as appropriate.

Further, the present invention is not limited to the configurations described in the above-described embodiment and its modifications, and configurations to which various other modifications are added can be adopted.

10, 110, 210, 310 Automotive projection device 20, 220 Projector 20a Light emitting part 30 First polarizing filter 32, 332 Holder 40, 140, 240 Second polarizing filter 100, 200 Vehicle 102 Body 102a Rear end opening 104, 204 Rear window 104a Outer surface 106, 152, 252 Diffusing material 150, 250 Translucent film 204b Inner surface 360 Lens D Drawing content

Claims (6)

In an in-vehicle projection device configured to draw on a window by irradiation light from a projector placed in the vehicle interior.
A diffusing material for diffusing the irradiation light from the projector is dispersed in the window or the translucent film attached to the window.
A first polarizing filter that polarizes the irradiation light from the projector in the first direction is arranged between the projector and the window.
The irradiation light from the projector is polarized in a second direction substantially orthogonal to the first direction at a position opposite to the first polarizing filter with respect to the window or the translucent film in which the diffuser is dispersed. An in-vehicle projection device characterized in that a second polarizing filter is arranged. The diffusing material is dispersed in the window,
The vehicle-mounted projection device according to claim 1, wherein the second polarizing filter is composed of a polarizing film attached to the outer surface of the window. The diffusing material is dispersed in the translucent film, and the diffusing material is dispersed in the translucent film.
The second polarizing filter is composed of a polarizing film attached to the inner surface of the window.
The vehicle-mounted projection device according to claim 1, wherein the translucent film is attached to the window via the second polarizing filter. The vehicle-mounted projection device according to any one of claims 1 to 3, wherein the first polarizing filter is supported by the projector. The above window is the rear window
The vehicle-mounted projection device according to any one of claims 1 to 4, wherein a lens for causing curvature of field in the horizontal direction is arranged between the projector and the rear window. The vehicle-mounted projection apparatus according to any one of claims 1 to 5, wherein the window or the translucent film in which the diffusing material is dispersed is prepared so that the transmittance is 30 to 70%. ..

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