JP2021133921A - Display system - Google Patents

Abstract

To provide a display system capable of preventing external light from being reflected to a driver, and capable of easily switching between a concave mirror and a plane mirror.SOLUTION: A display system 1 includes: a display device 20 installed on a mobile object; a concave mirror 12b for virtually displaying a display image shown by image light that the display device 20 emits in a first mode; and a plane mirror 12c for reflecting a back image incident into the mobile object in a second mode. The display device 20 and the concave mirror 12b are disposed so that a straight line connecting the center of the display device 20 and the center of the concave mirror 12b has a prescribed angle δ with respect to the cross direction of the mobile object when the mobile object is seen from above. In the display system 1, a normal direction at the center of the concave mirror surface of the concave mirror 12b when the first mode is functioned and a normal direction of the plane mirror surface of the plane mirror 12c when the second mode is functioned are not parallel to each other.SELECTED DRAWING: Figure 3C

Description

The present disclosure relates to a display system for displaying an image.

The vehicle visual system (display system) described in Patent Document 1 includes a projector, a screen, and a rear camera. The projector is installed in the passenger compartment. The screen is installed near the windshield of the vehicle. The rear image taken by the rear camera is projected on the screen by the projector.

U.S. Pat. No. 10,017,114

However, in the vehicle visual system (display system) described in Patent Document 1, due to the mutual positional relationship between the projector and the optical system including the screen, external light such as the headlight of the following vehicle is reflected by the screen for driving. May come into view of a person (moving occupant). Further, with the conventional screen, it is not possible to switch the mirror surface as a countermeasure in the event of a failure of the vehicle visual system.

Therefore, an object of the present disclosure is to provide a display system capable of suppressing reflection of external light toward a driver and easily switching between a concave mirror and a plane mirror. do.

The display system according to one aspect of the present disclosure includes a display unit mounted on a moving body, a concave mirror for displaying a virtual image of a display image displayed by the image light emitted by the display unit in the first mode, and a second. A plane mirror for reflecting a rear image incident on the moving body in the mode is provided, and when the moving body is viewed from above, a straight line connecting the center of the display unit and the center of the concave mirror is the moving body. The display unit and the concave mirror are arranged so as to have a predetermined angle with respect to the front-rear direction, and the normal direction at the center of the concave mirror surface of the concave mirror during the function of the first mode and the function of the second mode. The normal direction of the plane mirror surface of the plane mirror at time is non-parallel to each other.

In addition, some specific aspects of these may be realized by using a recording medium such as a system, a method, an integrated circuit, a computer program, or a computer-readable CD-ROM, and the system, the method, and the like. It may be realized using any combination of integrated circuits, computer programs and recording media.

According to the display system of the present disclosure, it is possible to suppress reflection of external light toward the driver, and it is possible to easily switch between a concave mirror and a plane mirror.

FIG. 1A shows a display system according to the first embodiment, and is a schematic explanatory view illustrating a state in which image light is incident on a rearview mirror and reflected. FIG. 1B is a schematic explanatory view showing a display system according to the first embodiment, exemplifying a state in which light from the rear of a moving body is incident on a rearview mirror and reflected. FIG. 2 is a block diagram illustrating the display system according to the first embodiment. FIG. 3A is a schematic diagram showing the positions of the optical body and the display device with respect to the driver in the conventional display system. FIG. 3B is a schematic view showing the positions of the optical body and the display device with respect to the driver when the display device is shifted to the right when the moving body equipped with the display system according to the first embodiment is viewed from above. FIG. 3C is another schematic view showing the position of the optical body and the display device with respect to the driver when the display device is shifted to the right when the moving body equipped with the display system according to the first embodiment is viewed from above. be. FIG. 3D is yet another schematic view showing the position of the optical body and the display device with respect to the driver when the display device is shifted to the right when the moving body equipped with the display system according to the first embodiment is viewed from above. Is. FIG. 4A is a schematic diagram showing the positions of the optical body and the display device with respect to the driver in the conventional display system. FIG. 4B is a schematic view showing the positions of the optical body and the display device with respect to the driver when the display device is shifted to the left when the moving body equipped with the display system according to the first embodiment is viewed from above. FIG. 4C is another schematic view showing the position of the optical body and the display device with respect to the driver when the display device is shifted to the left when the moving body equipped with the display system according to the first embodiment is viewed from above. be. FIG. 4D is yet another schematic view showing the position of the optical body and the display device with respect to the driver when the display device is shifted to the left when the moving body equipped with the display system according to the first embodiment is viewed from above. Is. FIG. 5A shows the display system according to the first embodiment, and when the rearview mirror is viewed from the left, the optical body is set to the first state as the first mode, and the image light is incident on the rearview mirror and reflected. It is sectional drawing which illustrated the state. FIG. 5B shows the display system according to the first embodiment. When the rearview mirror is viewed from the left, the optical body is set to the second state as the second mode, and the light behind the moving body is incident on the rearview mirror. It is a cross-sectional view which illustrates the state of being reflected. FIG. 6A shows a display system according to the first embodiment, and when the rearview mirror is viewed from above, the optical body is set to the first state as the first mode, and the image light is incident on the optical body and reflected. It is a cross-sectional view which illustrates. FIG. 6B shows the display system according to the first embodiment, and when the rearview mirror is viewed from above, the optical body is set to the second state as the second mode, and the light behind the moving body is incident on the optical body. It is sectional drawing which illustrates the state of reflection. FIG. 6C shows a display system according to the embodiment of the first embodiment, and is a cross-sectional view illustrating a case where the rearview mirror is viewed from above. FIG. 6D shows a display system according to the embodiment of the first embodiment, and is a cross-sectional view illustrating a case where the rearview mirror is viewed from above. FIG. 7A is a perspective view illustrating an optical body of the display system according to the first embodiment. FIG. 7B is a perspective view illustrating an optical body of the display system according to the embodiment of the first embodiment. FIG. 8 is a flowchart illustrating the processing of the rearview mirror of the display system according to the first embodiment. FIG. 9A is a diagram showing the position of the display device with respect to the optical body and the driver. FIG. 9B is another view showing the position of the display device with respect to the optics and the driver. FIG. 10A is a perspective view illustrating an optical body of the display system according to the first modification of the first embodiment. FIG. 10B is a perspective view illustrating an optical body of the display system according to the second modification of the first embodiment. FIG. 10C is a perspective view illustrating an optical body of the display system according to the third modification of the first embodiment. FIG. 11A shows the display system according to the fourth modification of the first embodiment. When the rearview mirror is viewed from above, the optical body is set to the first state as the first mode, and the image light is incident on the rearview mirror. It is a cross-sectional view which illustrates the state of being reflected. FIG. 11B shows the display system according to the fourth modification of the first embodiment. When the rearview mirror is viewed from above, the optical body is set to the second state as the second mode, and the light behind the moving body is the rearview mirror. It is sectional drawing which illustrates the state of making it incident on, and reflecting it. FIG. 12 is a perspective view illustrating the display system according to the second embodiment. FIG. 13 is a cross-sectional view illustrating a state in which the plane mirror of the display system according to the second embodiment is in a released state. FIG. 14 is a cross-sectional view illustrating a state in which the plane mirror of the display system according to the second embodiment is in a shielded state. FIG. 15 is a cross-sectional view illustrating a state in which the plane mirror of the display system according to the modified example of the second embodiment is in the released state. FIG. 16 is a cross-sectional view illustrating a state in which the plane mirror of the display system according to the modified example of the second embodiment is in a shielded state. FIG. 17 shows a display system according to the third embodiment, and is a cross-sectional view illustrating a case where the rearview mirror is viewed from above when the state of the plane mirror is set to the shielded state. FIG. 18 shows a display system according to a modified example of the third embodiment, and is a cross-sectional view illustrating a case where the rearview mirror is viewed from above when the state of the plane mirror is set to the shielded state. FIG. 19 is a cross-sectional view illustrating an optical body of a display system according to another modification.

The display system according to one aspect of the present disclosure includes a display unit mounted on a moving body, a concave mirror for displaying a virtual image of a display image displayed by the image light emitted by the display unit in the first mode, and a second. A plane mirror for reflecting a rear image incident on the moving body in the mode is provided, and when the moving body is viewed from above, a straight line connecting the center of the display unit and the center of the concave mirror is the moving body. The display unit and the concave mirror are arranged so as to have a predetermined angle with respect to the front-rear direction, and the normal direction at the center of the concave mirror surface of the concave mirror when the first mode is functioning and the normal direction of the second mode. The normal direction of the plane mirror surface of the plane mirror at the time of functioning is non-parallel to each other.

According to this, the posture of the concave mirror is tilted with respect to the front-rear direction of the moving body by a predetermined angle so that the straight line connecting the display unit and the concave mirror does not coincide with the front-rear direction of the moving body. Therefore, even if the external light such as the headlight of the following vehicle enters the concave mirror, the reflection in the direction of the driver's eyes can be suppressed, so that the external light may be reflected by the concave mirror and enter the driver's field of view. It can be suppressed.

Further, the normal direction at the center of the concave mirror surface in the first mode and the normal direction of the flat mirror surface in the second mode are non-parallel. Therefore, for example, the concave mirror and the plane mirror can be arranged so that the reflection direction in which the image light is incident and reflected on the concave mirror surface and the reflection direction in which the light is incident and reflected on the flat mirror surface reach the driver. Therefore, when the mode is switched between the first mode and the second mode, the amount of position adjustment of the concave mirror and the plane mirror in the horizontal direction can be reduced.

Therefore, it is possible to prevent the external light from being reflected toward the driver, and it is possible to easily switch between the concave mirror and the plane mirror. In particular, in this display system, it is possible to easily adjust the display mode by the image light and the light from the outside.

Further, in the display system according to another aspect of the present disclosure, the predetermined angle is the distance between the eyes of the occupant (driver) of the moving body who visually recognizes the concave mirror when the moving body is viewed from above. From the lower limit angle, which is the angle indicated by the straight line connecting the center of the concave mirror and the eye with respect to the straight line, which is obtained based on the length of the straight line connecting the center point between the eyes and the center of the concave mirror. It is an angle between a straight line in the left-right direction with respect to the traveling direction of the moving body passing through the center of the concave mirror and an upper limit angle which is an angle indicated by a straight line in the front-rear direction of the moving body passing through the center of the concave mirror.

According to this, by tilting the straight line connecting the display unit and the concave mirror with respect to the front-rear direction of the moving body within the above-mentioned predetermined angle range, the outside light is reflected in the direction deviated from the direction of the driver's eyes. Therefore, the possibility that the external light is reflected by the concave mirror and enters the driver's field of view can be further suppressed.

Further, in the display system according to another aspect of the present disclosure, the tangent line at the center of the display unit and the tangent line at the center of the concave mirror are parallel to each other.

According to this, even if the display unit is arranged so that the straight line connecting the display unit and the concave mirror is tilted with respect to the front-rear direction of the moving body, the optical path length between the display unit and the concave mirror is substantially equal, so that the concave mirror can be used. It is possible to suppress the distortion of the image that is reflected and can be seen by the driver.

Further, in the display system according to one aspect of the present disclosure, the display unit is arranged on the driver side of the moving body with respect to a straight line passing through the center of the concave mirror parallel to the front-rear direction of the moving body.

According to this, since the angle between the display unit and the concave mirror and the straight line connecting the display unit and the driver is reduced, the difference in the optical path length can be suppressed as a whole, and the image distortion can be reduced.

Further, in the display system according to another aspect of the present disclosure, the concave mirror and the plane mirror are housed in a first housing, and the first housing has a rotation axis for internally rotating the concave mirror and the plane mirror. ..

According to this, the concave mirror and the plane mirror can be rotated by rotating the rotation axis. Therefore, the first mode and the second mode can be easily switched by simply rotating the rotation shaft. Further, if the concave mirror surface and the plane mirror are arranged so that the reflection direction in which the image light is incident and reflected on the concave mirror surface and the reflection direction in which the light is incident and reflected on the flat mirror surface reach the driver, eventually Even in the switching to, the driver can be irradiated with the image light by the concave mirror surface and the light by the flat mirror surface only by rotating the rotation amount of the rotation shaft by the same amount.

Further, the display system according to another aspect of the present disclosure includes the concave mirror and an optical body having the plane mirror, and the plane mirror is arranged on the opposite side of the concave mirror so that the planomirror surface faces the outside. The optical body is wedge-shaped when viewed from the vertical direction of the moving body.

According to this, the plane mirror and the concave mirror can be arranged integrally on the front and back sides, and the posture of the concave mirror can be tilted in the front-rear direction of the moving body along the horizontal plane with respect to the posture of the plane mirror. Therefore, when the first mode and the second mode are switched, the amount of position adjustment in the horizontal direction of the display system can be reduced.

Further, in the display system according to another aspect of the present disclosure, the distance between the plane mirror and the concave mirror at the end of the optical body on the side closer to the driver in the left-right direction with respect to the traveling direction of the moving body is the moving body. It is smaller than the distance between the plane mirror and the concave mirror at the end on the side far from the driver in the left-right direction with respect to the traveling direction of.

According to this, when the optical body is arranged diagonally forward with respect to the driver, if the distance between the ends of the optical body on the driver side is smaller than the distance between the optical bodies on the opposite side, the first housing can be used. The length on the driver side can be made smaller than the length on the side far from the driver of the first housing. Therefore, the area of the console of the mobile body on which the display system is arranged can be effectively utilized.

Further, in the display system according to another aspect of the present disclosure, the plane mirror is arranged so as to face the concave mirror on the opposite side, and the concave mirror and the plane mirror are in the normal direction at the center of the concave mirror surface. And the normal direction of the flat mirror surface is parallel, and the flat mirror surface of the plane mirror and the axial direction of the rotation axis are not parallel.

According to this, if the normal direction at the center of the concave mirror surface and the normal direction of the flat mirror surface are parallel, it becomes easy to manufacture the optical body, so that the manufacturing cost of the optical body is unlikely to increase. Further, by simply making the flat mirror surface of the plane mirror and the axial direction of the rotation axis non-parallel, the normal direction at the center of the concave mirror surface when the first mode is functioning and the flat mirror surface method when the second mode is functioning. The line direction can be easily made non-parallel. Therefore, the amount of position adjustment in the horizontal direction of the display system can be reduced.

Further, in the display system according to another aspect of the present disclosure, the concave mirror and the optical body having the planar mirror are provided, and the planar mirror is arranged so as to face the concave mirror on the opposite side to the concave mirror and the planar mirror. Is wedge-shaped when viewed from the left-right direction with respect to the traveling direction of the moving body.

According to this, the plane mirror and the concave mirror can be arranged integrally on the front and back sides, and the posture of the concave mirror can be tilted in the front-rear direction of the moving body along the vertical plane of the flat mirror surface with respect to the posture of the plane mirror. Therefore, when the first mode and the second mode are switched, the amount of position adjustment in the horizontal direction of the display system can be reduced.

Further, in the display system according to another aspect of the present disclosure, the plane mirror and the concave mirror are housed in a second housing, and when viewed from the vertical direction of the moving body, the concave mirror and the driver are located between the concave mirror and the driver. A plane mirror is placed.

According to this, the plane mirror can be arranged on the driver side, and the concave mirror can be arranged on the back side of the plane mirror. Therefore, since the light can be incident on the entire flat mirror surface of the plane mirror, it is difficult for the second housing to cast a shadow on the flat mirror surface.

Further, in the display system according to another aspect of the present disclosure, the plane mirror is fixed to the second housing and changes the light transmittance.

According to this, since the light transmittance of the plane mirror can be changed, it is possible to suppress the glare felt by the driver even when a dazzling light such as a headlight of a following moving body is incident at night. can.

Further, in the display system according to another aspect of the present disclosure, the normal direction of the flat mirror surface in the second mode is 10 ° or more than the optical axis direction of the light reflected by the concave mirror in the first mode. Tilt.

According to this, the normal direction of the flat mirror surface can be tilted by 10 ° or more from the optical axis direction of the light reflected by the concave mirror surface. Therefore, it is possible to suppress the reflection of the object (rear image) existing behind the moving body.

Further, in the display system according to another aspect of the present disclosure, the plane mirror is movable and is housed in the second housing in the first mode.

According to this, since the plane mirror can be moved, the second mode and the first mode can be easily switched.

Further, in the display system according to another aspect of the present disclosure, the plane mirror has a Fresnel reflecting surface.

According to this, the plane mirror can control the light distribution and reflect the light incident from the rear of the moving body. For this reason, the display is compared with a configuration in which the tangent line in the specified direction of the flat mirror surface at the center of the flat mirror surface, which is a single surface, and the tangent line in the specified direction of the concave mirror surface at the center of the concave mirror surface are arranged so as to be non-parallel. It is possible to suppress the increase in size of the system.

Further, in the display system according to another aspect of the present disclosure, the plane mirror has a posture adjusting unit for adjusting the posture with respect to the concave mirror surface.

According to this, since the posture of the plane mirror with respect to the concave mirror can be arbitrarily adjusted, the degree of freedom of adjustment of the display system can be increased when the second mode and the first mode are switched.

Each of the embodiments described below is a specific example of the present disclosure. The numerical values, shapes, materials, components, arrangement positions of the components, etc. shown in the following embodiments are examples, and are not intended to limit the present disclosure. Further, among the components in the following embodiments, the components not described in the independent claims will be described as arbitrary components. Moreover, in all the embodiments, each content can be combined.

Further, each figure is a schematic view and is not necessarily exactly illustrated. Further, in each figure, the same components are designated by the same reference numerals. Further, in the following embodiments, expressions such as substantially parallel are used. For example, substantially parallel not only means that they are perfectly parallel, but also that they are substantially parallel, that is, they include an error of, for example, about several percent. Specifically, "parallel" means that the angle (acute angle) formed by the two target straight lines is 0 degrees or more and 10 degrees or less. It is more preferable that "parallel" means that the angle (acute angle) formed by the two target straight lines is 0 degrees or more and 5 degrees or less. Further, substantially parallel means parallel to the extent that the effects of the present disclosure can be achieved. The same applies to expressions using other "abbreviations".

Hereinafter, the display system of the present disclosure will be specifically described with reference to the drawings.

(Embodiment 1)
<Configuration: Display system 1>
FIG. 1A is a schematic explanatory view showing a display system 1 according to the first embodiment, exemplifying a state in which image light is incident on a rearview mirror 10 and reflected. FIG. 1B shows a display system 1 according to the first embodiment, and is a schematic explanatory view illustrating a state in which light from the rear of the moving body is incident on the rearview mirror 10 and reflected.

As shown in FIGS. 1A and 1B, the display system 1 is mounted on the moving body, and is arranged, for example, on the ceiling portion 4 of the moving body main body, the windshield 3 on the ceiling portion 4 side, and the like. The display system 1 is driven by electric power obtained from the mobile body. The moving body is a vehicle such as an automobile, a ship, an aircraft, or the like. In the present embodiment, an automobile will be used as the moving body.

The display system 1 is configured so that the driver can see an object existing behind or around the moving body. The display system 1 displays a display image as, for example, an image of an object existing behind the moving body taken by an imaging unit 31 (described later) mounted on the moving body. Further, the display system 1 projects a rear image existing behind the moving body by the light incident from the rear of the moving body. That is, the display system 1 also functions as a rear view mirror.

The display system 1 has a plurality of operation modes. Of the plurality of operation modes, the first mode is a display image indicated by the projected image light by projecting the image light emitted from the display surface 21a of the display device 20 onto the optical body 12 described later. This is a mode for displaying a virtual image. Of the plurality of operation modes, the second mode is a mode in which a rear image, which is an object behind the moving body, is projected by reflecting light incident from the rear of the moving body.

FIG. 2 is a block diagram illustrating the display system 1 according to the first embodiment.

As shown in FIGS. 1A, 1B and 2, the display system 1 includes an imaging unit 31, a display device 20, a rearview mirror 10, and an input operation unit 32.

[Imaging unit 31]
The imaging unit 31 is mounted on the moving body so as to image the periphery of the moving body, particularly the rear side of the moving body. The imaging unit 31 outputs image data of an image captured behind the moving body to the display device 20. The imaging unit 31 is, for example, a CMOS (Complementary Metal Oxide Sensor) image sensor, and photographs the rear of the moving body. Further, the imaging unit 31 is not limited to the CMOS image sensor, and may be an image sensor such as a CCD (Charge Coupled Device) image sensor.

[Display device 20]
The display device 20 is in a posture capable of irradiating the rearview mirror 10 with an image captured by the imaging unit 31, and is arranged on the ceiling portion 4 of the main body of the moving body with the display surface 21a facing downward. When the moving body is viewed in the vertical direction, the display device 20 is arranged at least closer to the driver than the optical body 12 in the front-rear direction of the moving body. The display device 20 is provided, for example, in an overhead console or the like. The display device 20 emits image light that forms an image. The display device 20 is an example of a display unit.

The display device 20 includes a display control unit 22, a light source unit 23, and a liquid crystal panel 24 (LCD: Liquid Crystal Display).

The display control unit 22 controls the display state of the image by the display device 20. The display control unit 22 is communicably connected to the image pickup unit 31 via the in-vehicle network of the mobile body, and acquires image data of the captured image from the image pickup unit 31. The display control unit 22 displays an image based on the image data acquired from the image pickup unit 31 on the liquid crystal panel 24, that is, on the display surface 21a of the display device 20.

Further, the display control unit 22 stops the image light emitted from the light source unit 23 when the second mode is executed (when the optical body 12 is in the second posture, which will be described later). That is, the display control unit 22 controls the on / off of the image light emitted from the light source unit 23 according to the switching state between the first mode and the second mode.

The light source unit 23 is a light emitting module used as a backlight of the liquid crystal panel 24. The light source unit 23 is a side light type light source unit using a solid-state light emitting element such as a light emitting diode or a laser diode, and is arranged above the liquid crystal panel 24. The light emitted by the light source unit 23 passes through the liquid crystal panel 24 and is emitted from the display surface 21a of the display device 20, so that the light is emitted from the display surface 21a of the display device 20.

The liquid crystal panel 24 is a liquid crystal display element arranged below the light source unit 23. For example, the liquid crystal panel 24 is a light transmissive type or light transflective type TFT liquid crystal display (Thin Film Transistor Liquid Crystal Display) or the like. In the liquid crystal panel 24, when light is emitted from the light source unit 23 on the back surface side, the transmitted light causes the display surface 21a, which is the surface facing the optical member 25, to emit light. The liquid crystal panel 24 emits image light indicating an image including numbers, characters, figures, and the like from the liquid crystal panel 24 in response to a control instruction from the display control unit 22.

Further, the display device 20 displays an image captured by the imaging unit 31 on the display surface 21a, and emits image light indicating the image from the display surface 21a. The image light emitted from the display surface 21a is reflected by the optical member 25 and then incident on the rear-view mirror 10, and is reflected by the rear-view mirror 10 and incident on the driver's eyes. That is, the driver can visually recognize the display image shown by the image light emitted to the rearview mirror 10 based on the image displayed on the display surface 21a of the display device 20.

[Room mirror 10]
The rear-view mirror 10 is, for example, a rear-view mirror of the moving body, and is arranged in the windshield 3 on the ceiling portion 4 side in order to visually recognize the rear of the moving body, and is positioned so as to be in the view of the driver seated in the front seat. It is attached. The rearview mirror 10 is attached to the windshield 3 of the moving body via the mounting bracket 19. The rearview mirror 10 has a hinge between the first housing 11 and the mounting bracket 19 so that the driver can adjust the rearview mirror 10 at a preferred position and angle. The rearview mirror 10 may be provided on an overhead console or the like, and is not limited to the windshield 3.

An optical body 12 is built in the rearview mirror 10. Although the details will be described later, the optical body 12 has a support body 12a, a concave mirror 12b, a plane mirror 12c, and a rotation axis 12d. The concave mirror 12b and the curved mirror 12c are supported by the support 12a. Then, in the rearview mirror 10, the support 12a is rotated by the rotation shaft 12d, so that the concave mirror 12b is directed to the driver side as shown in FIG. 1A, and the plane mirror 12c is directed to the driver side as shown in FIG. 1B. It is provided with a configuration in which the concave mirror 12b and the plane mirror 12c can be switched by pointing toward.

Hereinafter, the positional relationship between the optical body 12 and the display device with respect to the driver will be described with reference to FIGS. 3A to 3D and FIGS. 4A to 4D. FIG. 3A is a schematic diagram showing the positions of the optical body and the display device with respect to the driver in the conventional display system. FIG. 3B is a schematic diagram showing the positions of the optical body 12 and the display device 20 with respect to the driver when the display device 20 is shifted to the right when the moving body equipped with the display system 1 according to the first embodiment is viewed from above. It is a figure. FIG. 3C shows the positions of the optical body 12 and the display device 20 with respect to the driver when the display device 20 is shifted to the right when the moving body equipped with the display system 1 according to the first embodiment is viewed from above. It is a schematic diagram of. FIG. 3D further shows the positions of the optical body 12 and the display device 20 with respect to the driver when the display device 20 is shifted to the right when the moving body equipped with the display system 1 according to the first embodiment is viewed from above. It is another schematic diagram. FIG. 4A is a schematic diagram showing the positions of the optical body and the display device with respect to the driver in the conventional display system. FIG. 4B is a schematic diagram showing the positions of the optical body 12 and the display device 20 with respect to the driver when the display device 20 is shifted to the left when the moving body equipped with the display system 1 according to the first embodiment is viewed from above. It is a figure. FIG. 4C shows the positions of the optical body 12 and the display device 20 with respect to the driver when the display device 20 is shifted to the left when the moving body equipped with the display system 1 according to the first embodiment is viewed from above. It is a schematic diagram of. FIG. 4D further shows the positions of the optical body 12 and the display device 20 with respect to the driver when the display device 20 is shifted to the left when the moving body equipped with the display system 1 according to the first embodiment is viewed from above. It is another schematic diagram.

First, when the moving body is viewed from above using FIGS. 3A to 3D, a case where the display device 20 is shifted to the right, that is, to the driver side with respect to the conventional display device of FIG. 3A will be described. .. 3A to 3D exemplify the case where the moving body is viewed from above. In these figures, the solid line shows the optical path from the display device 20 to the driver. Further, the broken line indicates the optical path of the external light incident from the rear window of the moving body such as the headlight of the following vehicle. The alternate long and short dash line is a straight line connecting the center of the concave mirror 12b to the driver's left eye, and is a fixed straight line in each figure.

First, FIG. 3A shows the position of the optical body of the conventional display system and the display device with respect to the driver. Here, the angle shown in FIG. 3A is defined. This is the same not only in FIG. 3A but also in other figures (FIGS. 3B to 3D, FIGS. 4A to 4D). In FIG. 3A, the angle (acute angle) formed by the straight line connecting the center of the driver's face and the center of the concave mirror and the straight line connecting the driver's left eye and the center of the concave mirror is defined as the angle γ. Further, the angle (acute angle) formed by the straight line connecting the center of the display device 20 and the center of the concave mirror 12b and the straight line parallel to the vehicle front-rear direction is defined as the angle δ. In FIG. 3A, the angle γ is L for the length of a straight line connecting the midpoint of the driver's left and right eyes (the midpoint between the eyes) and the center of the concave mirror, and the distance between the driver's left and right eyes (the distance between the left and right eyes of the driver). Assuming that half of the eye-to-eye distance) is X, it can be obtained by γ = arctan (X / L). It is assumed that this angle γ is constant not only in FIG. 3A but also in other figures (FIGS. 3B to 3D and 4A to 4D). As a specific example, assuming that the average eye spacing (= 2X) of the human body is 65 mm and L is 500 mm, the angle γ is about 4 degrees. On the other hand, the angle δ is set to 0 degrees in FIG. 3A. The angle γ may change depending on the values of 2X and L. For example, the angle γ may be about 1.8 degrees.

In FIGS. 3B to 3D and 4B to 4D, which are the configurations of the present embodiment described below, the tangent line at the center of the display device 20 and the tangent line at the center of the concave mirror 12b are parallel to each other. Is. The tangent line at the center of the display device 20 means the tangent line at the center of the display surface 21a (described later) of the display device 20, and the tangent line at the center of the concave mirror 12b means the concave mirror surface 12b1 (described later) of the concave mirror 12b. Means the tangent at the center of. As a result, in the present embodiment, even if the display device 20 is arranged so that the straight line connecting the display device 20 and the concave mirror 12b is tilted with respect to the front-rear direction of the moving body, the display device 20 and the concave mirror 12b are between the display device 20 and the concave mirror 12b. Since the distance is kept substantially constant, that is, the optical path lengths are kept substantially equal regardless of the location, distortion of the image reflected on the concave mirror 12b that can be seen by the driver can be suppressed.

In the configuration of FIG. 3A (conventional configuration), when the moving body is viewed from above, the light from the display device is reflected by the concave mirror of the optical body to the optical path (solid line) toward the driver, and the external light from the rear of the vehicle. The optical paths (broken lines) reflected by the concave mirror toward the driver match. Therefore, when the external light enters the concave mirror, it may reach the driver, and the external light reflected by the concave mirror may enter the driver's eyes.

Next, as shown in FIG. 3B, when the moving body is viewed from above, consider a configuration in which the display device 20 is slightly shifted to the right (driver side). As a result, the position of the concave mirror 12b is also rotated counterclockwise so that the light of the display device 20 can be visually recognized by the driver. At this time, a case where the position of the display device 20 is slightly shifted to the right so that the angle δ and the angle γ satisfy the condition of δ <γ will be illustrated. For example, the angle δ is 2 degrees. At this time, the external light from the rear is reflected by the concave mirror 12b as shown by the broken line, and then deviates by an angle δ from the straight line connecting the center of the driver's face and the center of the concave mirror 12b as compared with FIG. 3A. It may reach the driver's right eye side. However, the external light reflected by the concave mirror 12b is applied to the width of 2X (the width or range of the double-headed arrow in FIG. 3B), which is the distance between the driver's eyes. There is still the possibility that the outside light will get into the driver's eyes.

That is, when the angle δ is further increased, the reflected light path of the external light shown in FIG. 3B moves (rotates) counterclockwise to the right. Then, when δ = γ, the outside light just reaches the driver's right eye. Therefore, in the range of δ ≦ γ, the reflected light path of the outside light reaches somewhere between the left and right eyes of the driver. Therefore, even if the driver moves slightly, the reflected light of the outside light may reach the eyes. In other words, when the range of δ> γ is set, the reflected light path of the external light is directed away from between the left and right eyes of the driver, so that the possibility of the external light reaching the driver's eyes is suppressed.

Therefore, as shown in FIG. 3C, when the moving body is viewed from above, a configuration in which the display device 20 is further shifted to the right (driver side) is considered. Specifically, the position of the display device 20 is shifted so that the angle δ and the angle γ satisfy the condition of δ> γ. Accordingly, the position of the concave mirror 12b is also rotated counterclockwise so that the light of the display device 20 can be visually recognized by the driver. Here, an example in which the angle δ is set to 45 degrees is shown in order to satisfy δ> γ. At this time, the external light from the rear is reflected by the concave mirror 12b as shown by the broken line, and then reaches the right direction of the moving body. Therefore, there is almost no possibility that the outside light will reach the driver's eyes.

In the arrangement shown in FIG. 3C, the concave mirror 12b and the display device 20 are in the direction facing the driver. That is, assuming that the horizontal distance from the center of the driver's seat to the center of the moving body is 350 mm, L = 500 mm as described above, so that the straight line connecting the driver and the center of the concave mirror 12b and the vehicle front-rear direction The angle (acute angle) formed by the straight line is arcsin (350/500) = about 45 degrees, which is substantially the same as the angle δ. Therefore, the concave mirror 12b and the display device 20 face the driver.

In this configuration, the tangent line at the center of the display device 20 and the tangent line at the center of the concave mirror 12b are arranged so as to be parallel to each other. Therefore, the light (image light) emitted by the display device 20 is reflected substantially vertically by the concave mirror 12b and reaches the driver. Therefore, the optical path length of the image light is substantially constant regardless of the location. Therefore, the image distortion is the smallest as compared with the other configurations shown in FIGS. 3A to 3D and 4A to 4D.

Next, as shown in FIG. 3D, when the moving body is viewed from above, consider a configuration in which the display device 20 is further shifted to the right (driver side) as compared with FIG. 3C. Specifically, the position of the display device 20 is shifted so that the angle δ and the angle γ are δ >> γ. Accordingly, the position of the concave mirror 12b is further rotated counterclockwise so that the light of the display device 20 can be visually recognized by the driver. As a result, the external light from the rear is reflected by the concave mirror 12b and reflected toward the front side of the vehicle. Therefore, there is almost no possibility that outside light will reach the driver's eyes.

When the angle δ is further increased as the angle satisfying δ> γ, when the angle δ becomes 90 degrees, the straight line connecting the center of the display device 20 and the center of the concave mirror 12b is parallel to the left-right direction of the moving body. become. Therefore, when the angle δ substantially exceeds 90 degrees, the display device 20 is arranged in front of the moving body with respect to the concave mirror 12b. However, as shown in FIG. 1A, since the rearview mirror 10 having the concave mirror 12b is arranged on the windshield 3, the display device 20 is more than the windshield 3 when the angle δ is substantially more than 90 degrees. It will be placed in front, which makes it practically difficult.

The above can be summarized as follows. The straight line connecting the center of the display device 20 and the center of the concave mirror 12b is arranged at a predetermined angle δ with respect to the front-rear direction of the moving body when the moving body is viewed from above. Then, the predetermined angle δ sets the distance (2X) between the eyes of the occupant of the moving body that visually recognizes the concave mirror 12b, the midpoint of each of the left and right eyes, and the center of the concave mirror 12b when the moving body is viewed from above. A lower limit angle γ at the center of the concave mirror 12b, a straight line in the left-right direction with respect to the traveling direction of the moving body passing through the center of the concave mirror 12b, and a moving body passing through the center of the concave mirror 12b, which are obtained based on the length (L) of the straight line to be connected. It is an angle between the upper limit angle obtained by the straight line in the front-back direction of. Then, as a specific example of the predetermined angle δ, 4 degrees <δ <90 degrees.

Depending on the posture, shape and size of the concave mirror 12b, the posture, shape and size of the display device 20, the display device 20 is not arranged in front of the windshield 3 even if the angle δ slightly exceeds 90 degrees. In some cases, the angle δ is not limited to less than 90 degrees. In the present embodiment, when the angle δ is 90 degrees or more, the display device 20 is arranged in front of the moving body from the concave mirror 12b. Therefore, the angle δ may be less than 90 degrees. Illustrate.

When γ is about 1.8 degrees, a specific example of the predetermined angle δ may be 1.8 degrees <δ <90 degrees.

The lower limit angle γ of the angle δ is obtained based on the eye spacing in the above-described first embodiment, but it is desirable that the external light reflected by the concave mirror 12b deviates from the range of the eye box. good. In this case, for example, if the width of the eye box is twice the eye spacing (= 4X), the angle γ is about 8 degrees. Further, regarding the upper limit angle, as described with reference to FIG. 3C, the image distortion becomes the minimum when the angle δ is 45 degrees (= δ1), and when the angle δ increases more than that, the image distortion increases. From this, the upper limit angle is preferably an angle δ1. Further, as the angle δ becomes larger, the size of the support 12a that supports the concave mirror 12b and the plane mirror 12c also becomes larger. From these facts, the desirable range of the predetermined angle δ is 8 degrees <δ ≦ δ1 (45 degrees).

Next, in the same manner, when the moving body is viewed from above using FIGS. 4A to 4D, the display device 20 is moved to the left, that is, in a direction away from the driver side with respect to the conventional display device of FIG. 4A. The case of shifting will be described. 4A to 4D exemplify the case where the moving body is viewed from above. Further, the meanings of the solid line, the broken line, and the alternate long and short dash line in each figure are the same as those in FIGS. 3A to 3D. Further, the definitions of the angle γ and the angle δ are the same as those in FIGS. 3A to 3D. Therefore, also in FIGS. 4B to 4D, the angle γ is about 4 degrees.

First, since the configuration of FIG. 4A is the case where the angle δ = 0 degrees, it is the same conventional configuration as that of FIG. 3A. Therefore, as described in the description of FIG. 3A, the external light reflected by the concave mirror 12b may enter the driver's eyes.

Next, as shown in FIG. 4B, when the moving body is viewed from above, consider a configuration in which the display device 20 is slightly shifted to the left (direction away from the driver side). As a result, the position of the concave mirror 12b is also rotated clockwise so that the light of the display device 20 can be visually recognized by the driver. At this time, a case where the position of the display device 20 is slightly shifted to the left so that the angle δ and the angle γ satisfy the condition of δ <γ will be illustrated. For example, the angle δ is 2 degrees. At this time, the external light from the rear is reflected by the concave mirror 12b as shown by the broken line, and then the operation is deviated by an angle δ from the straight line connecting the center of the driver's face and the center of the concave mirror as compared with FIG. 4A. It may reach the left eye side of the person. However, the external light reflected by the concave mirror 12b is applied to the width of 2X (the width or range of the double-headed arrow in FIG. 4B), which is the distance between the driver's eyes. There is still the possibility that the outside light will get into the driver's eyes.

That is, when the angle δ is further increased, the reflected light path of the external light shown in FIG. 4B moves (rotates) clockwise to the left. Then, when δ = γ, the outside light just reaches the driver's left eye. Therefore, in the range of δ ≦ γ, the reflected light path of the outside light reaches somewhere between the left and right eyes of the driver. Therefore, even if the driver moves slightly, the reflected light of the outside light may reach the eyes. In other words, when the range of δ> γ is set, the reflected light path of the external light is directed away from between the left and right eyes of the driver, so that the possibility of the external light reaching the driver's eyes is suppressed.

Therefore, as shown in FIG. 4C, when the moving body is viewed from above, a configuration in which the display device 20 is further shifted to the left (direction away from the driver side) is considered. Specifically, the position of the display device 20 is shifted so that the angle δ and the angle γ satisfy the condition of δ> γ. Accordingly, the position of the concave mirror 12b is also rotated clockwise so that the light of the display device 20 can be visually recognized by the driver. Here, an example in which the angle δ is set to 45 degrees (= δ1) in order to satisfy δ> γ is shown. At this time, since the external light from the rear is incident on the concave mirror 12b in the direction perpendicular to the concave mirror 12b as shown by the broken line, it reaches the rear of the moving body after being reflected. Therefore, there is almost no possibility that the outside light will reach the driver's eyes.

Next, as shown in FIG. 4D, when the moving body is viewed from above, consider a configuration in which the display device 20 is further shifted to the left (direction away from the driver side) as compared with FIG. 4C. Specifically, the position of the display device 20 is shifted so that the angle δ and the angle γ are δ >> γ. Accordingly, the position of the concave mirror 12b is further rotated clockwise so that the light of the display device 20 can be visually recognized by the driver. As a result, the external light from the rear is reflected by the concave mirror 12b and reflected to the rear left half side of the vehicle. Therefore, there is almost no possibility that outside light will reach the driver's eyes.

When the angle δ is further increased as the angle satisfying δ> γ, when the angle δ becomes 90 degrees or more, the display device 20 is arranged in front of the windshield 3 as described in FIG. 3D. Therefore, it cannot be practically placed.

From the above, as in the case of FIGS. 3B to 3D, in the configuration of FIGS. 4B to 4D, as a specific example of the predetermined angle δ, 4 degrees <δ <90 degrees. Further, as in the case of FIGS. 3B to 3D, from the viewpoint of the eye box, the viewpoint of the size of the support 12a, and the configuration of FIG. 4D (δ> δ1 = 45 degrees), the reflected light of the outside light is directed to the passenger seat side. Even in the configurations of FIGS. 4B to 4D, the desirable range of the predetermined angle δ is 8 degrees <δ≤δ1 (45 degrees) because the reflected light of the outside light may reach the eyes of the passenger seat occupant facing the passenger seat. It becomes.

The positional relationship between the optical body 12 and the display device 20 with respect to the driver has been described above, but in the following description, a configuration satisfying a desirable predetermined angle δ (8 degrees <δ ≤ δ 1 (45 degrees)), for example, the figure. The description will be made on the premise that the configuration is 3C.

The rearview mirror 10 can execute a plurality of operation modes by adjusting the postures of the optical body 12 and the translucent cover 16 described later.

FIG. 5A shows the display system 1 according to the first embodiment, and when the rearview mirror 10 is viewed from the left, the optical body 12 is set to the first state as the first mode, and the image light is incident on the rearview mirror 10. It is sectional drawing which illustrates the state of letting and reflecting. In FIG. 5A, only the eyes of the driver are illustrated for convenience. The same applies to the figures after FIG. 5B. FIG. 5B shows the display system 1 according to the first embodiment. When the rearview mirror 10 is viewed from the left, the optical body 12 is set to the second state as the second mode, and the light behind the moving body is the rearview mirror. It is sectional drawing which illustrates the state of making it incident on 10 and reflecting it.

FIG. 6A shows the display system 1 according to the first embodiment, and when the rearview mirror 10 is viewed from above, the optical body 12 is set to the first state as the first mode, and the image light is incident on the optical body 12. It is a cross-sectional view which illustrates the state of being reflected. FIG. 6B shows the display system 1 according to the first embodiment, and when the rearview mirror 10 is viewed from above, the optical body 12 is set to the second state as the second mode, and the light behind the moving body is emitted from the optical body 12. It is sectional drawing which illustrates the state of making it incident on, and reflecting it.

As shown in FIGS. 1A to 6B, the rearview mirror 10 includes a first housing 11, an optical body 12, a translucent cover 16, a drive control unit 17, and a drive unit 18.

As shown in FIGS. 5A to 6B, the first housing 11 is an accommodating body made of, for example, a molded product of synthetic resin. The first housing 11 forms an accommodation space 11a inside, and when the moving body is a vehicle, the first housing 11 is formed in a rectangular parallelepiped shape that is long in the left-right direction and is opened on the driver side. The first housing 11 is formed so that the dimensions in the left-right direction with respect to the traveling direction of the moving body are larger than the dimensions in the vertical direction and the dimensions in the front-rear direction. The first housing 11 accommodates the optical body 12 and the translucent cover 16 in the accommodation space 11a.

The first housing 11 internally rotatably holds the optical body 12. The first housing 11 rotatably holds the optical body 12 in the accommodation space 11a in a state where the optical body 12 is housed in the accommodation space 11a. Specifically, the side walls on both sides of the first housing 11 in the left-right direction rotatably hold the optical body 12 around the axis O.

Further, the first housing 11 holds the translucent cover 16 arranged on the driver side, that is, on the opening 11b side of the optical body 12. Specifically, the first housing 11 holds the translucent cover 16 at a position that does not hinder the rotation of the optical body 12 in the accommodating space 11a in a state where the translucent cover 16 is accommodated in the accommodating space 11a. There is.

FIG. 7 is a perspective view illustrating the optical body 12 of the display system 1 according to the first embodiment.

As shown in FIG. 7, the optical body 12 has a support 12a, a concave mirror 12b, a plane mirror 12c, and a rotation axis 12d.

The support 12a has a one-sided surface 12a1 that supports the concave mirror 12b, and a other side surface 12a2 that is opposite to the one-sided surface 12a1 that supports the plane mirror 12c. One surface 12a1 of the support 12a is inclined with respect to the other surface 12a2, and when the support 12a is viewed in the vertical direction, the support 12a is wedge-shaped. In the present embodiment, the support 12a has a long flat plate shape in the left-right direction, and the thickness of one end edge in the left-right direction is thinner than the thickness of the other end edge. In the present embodiment, the thickness of the right end portion of the optical body 12 (lengths D1 and D2 in FIG. 7) in the left-right direction with respect to the traveling direction of the moving body is the thickness of the left end portion (length D3 in FIG. 7). It is smaller than D4).

The support 12a supports the concave mirror 12b and the plane mirror 12c so that the concave mirror 12b and the plane mirror 12c overlap each other when viewed in the front-rear direction of the moving body. In other words, the support 12a is sandwiched between the concave mirror 12b and the plane mirror 12c so that the concave mirror 12b and the plane mirror 12c are integrated on the front and back sides. Specifically, the support 12a fixes the concave mirror 12b to one surface 12a1 so that the flat mirror surface 12c1 is inclined with respect to the plane perpendicular to the normal direction H1 at the center of the concave mirror surface 12b1 and is a plane mirror. 12c is fixed to the other surface 12a2. In other words, the support 12a supports the plane mirror 12c and the concave mirror 12b so that the left-right direction of the concave mirror 12b is tilted with respect to the plane mirror 12c.

As shown in FIGS. 6A, 6B and 7, the support 12a has rotating shafts 12d supported on both side walls in the left-right direction of the first housing 11 while supporting the concave mirror 12b and the curved mirror 12c. .. The rotating shaft 12d is a pair of columnar protrusions, which are rotatably supported with respect to the side walls on both sides in the left-right direction.

A gear mechanism that is automatically rotated and controlled by the drive unit 18 of FIG. 2 is connected to the rotary shaft 12d. When the drive unit 18 of FIG. 2 drives and controls the gear mechanism, the rotating shaft 12d rotates around the axis O, so that the optical body 12 rotates.

The concave mirror 12b is formed with a concave mirror surface 12b1 for directly or indirectly incident image light emitted from the display surface 21a of the display device 20 and reflecting the incident image light. When the concave mirror 12b faces the opening 11b side of the first housing 11 (first mode), that is, when it faces the driver side, the concave mirror surface 12b1 is an image emitted from the display surface 21a of the display device 20. Reflects light toward the driver. The concave mirror surface 12b1 displays a virtual image displayed by the image light emitted by the display device 20 in the first mode. The direct incident means that the image light emitted from the display surface 21a directly enters the concave mirror surface 12b1 without passing through the optical member 25 of FIG. 1A, and the indirectly incident means that the image light emitted from the display surface 21a is emitted. The image light is incident on the concave mirror surface 12b1 via the optical member 25 of FIG. 1A. The optical member 25 of FIG. 1A is a light reflecting member such as a mirror that reflects light, a light guide member that guides light, and the like.

The concave mirror 12b is arranged so as to overlap the support 12a so that the concave mirror surface 12b1 faces the opposite side of the support 12a, and is supported and fixed to one surface 12a1 of the support 12a. Specifically, the concave mirror 12b is curved in an arc shape along the axis O, and the concave mirror 12b is formed on one surface 12a1 of the support 12a so that the left and right edges of the concave mirror 12b are separated from the plane mirror 12c as compared with the central portion. It is supported and fixed.

The curved mirror 12c is arranged on the support so as to face the concave mirror 12b on the opposite side. The plane mirror 12c is arranged so as to overlap the support 12a so that the flat mirror surface 12c1 faces the opposite side of the support 12a, and is supported and fixed to the other surface 12a2 of the support 12a.

Further, the plane mirror 12c is formed with a flat mirror surface 12c1 for projecting an object behind the moving body by reflecting light incident from the rear of the moving body. When the plane mirror 12c faces the opening 11b side of the first housing 11 (second mode), that is, when the plane mirror surface 12c1 faces the driver side, the plane mirror 12c receives light incident from the rear of the moving body. Reflects towards the driver. The flat mirror surface 12c1 displays a rear view of the light incident on the moving body in the second mode.

The rotation shaft 12d is arranged along the left-right direction with respect to the traveling direction of the moving body, and the concave mirror 12b and the plane mirror 12c are rotatably supported inside the first housing 11. That is, the rotation shaft 12d is formed on both end faces in the left-right direction of the support and projects from both end faces. In the present embodiment, the axial direction of the rotating shaft 12d is substantially parallel to the left-right direction of the concave mirror surface 12b1.

In such an optical body 12, the posture of the optical body 12 is switched between the first state and the second state by the rotational operation. In other words, it can be switched between the first mode and the second mode.

The first state is a state in which the concave mirror 12b of the optical body 12 faces the opening 11b side of the first housing 11, that is, a state facing the driver side when the first mode is executed. The first state can be said to be the posture of the optical body 12 (first posture). In the first state, the image light emitted from the display surface 21a of the display device 20 is directly or indirectly incident on the concave mirror surface 12b1, and the incident image light is reflected toward the driver's eyes.

The second state is a state in which the plane mirror 12c of the optical body 12 faces the opening 11b side of the first housing 11, that is, a state facing the driver side when the second mode is executed. The second state can also be said to be the posture of the optical body 12 (second posture). In the second state, light from the rear side of the moving body is incident on the flat mirror surface 12c1, and the incident light is reflected toward the driver's eyes.

That is, as shown in FIGS. 5A and 5B, the normal direction H1 at the center of the concave mirror surface 12b1 when the first mode is functioning and the normal direction H2 of the flat mirror surface 12c1 when the second mode is functioning are mutually exclusive. It becomes non-parallel. Specifically, in the optical body 12, the angle θ1 between the normal direction H1 and the horizontal direction at the center of the concave mirror surface 12b1 in the first mode is the normal direction H2 and the horizontal direction of the plano mirror surface 12c1 in the second state. It is configured to be different from the angle θ2 of. Further, the angle between the direction in which the image light in the first state is incident on the concave mirror surface 12b1 and the direction in which the image light is reflected by the concave mirror surface 12b1 toward the driver is such that the light from the rear of the moving body in the second state is incident on the flat mirror surface 12c1. It is larger than the angle between the direction of light and the direction of reflection on the flat mirror surface 12c1 toward the driver.

Further, the optical body 12 has a wedge shape when viewed from the vertical direction of the moving body. Specifically, in the left-right direction with respect to the traveling direction of the moving body, the distance between the plane mirror 12c and the concave mirror 12b at one end is smaller than the distance between the plane mirror 12c and the concave mirror 12b at the other end. As shown in FIG. 7A, when the optical body 12 is viewed from above, the length D2 of the edge on one side in the left-right direction is shorter than the length D4 of the edge on the other side. Further, when the optical body 12 is viewed from below, the length D1 of the edge on one side in the left-right direction is shorter than the length D3 of the edge on the other side.

As shown in FIGS. 5A and 5B, the translucent cover 16 is closer to the driver than the optical body 12, and is held by the first housing 11 so as to close the opening 11b of the first housing 11. The translucent cover 16 is made of, for example, a resin that transmits visible light.

The plane mirror 12c may have an antiglare function. In this case, for example, when the plane mirror 12c faces the opening 11b side of the first housing 11 (second mode), when the driver feels that the reflection of the headlight of the following vehicle is dazzling, the lever portion 15a is pressed. The inclination of the first housing 11 is changed by the rotating operation. As a result, the plane mirror 12c functions as an antiglare mirror.

Here, when the concave mirror 12b faces the opening 11b side of the first housing 11 (first mode), for example, the display control unit 22 emits a light source according to the brightness of the rear image captured by the imaging unit 31. The anti-glare function is automatically realized by controlling the unit 23. Therefore, when switching from the second mode to the first mode, even if the inclination of the first housing 11 is changed by the lever portion 15a, the first housing 11 is linked to the operation of switching to the first mode. It is configured so that the tilt returns to its original position. As a result, the angle of the concave mirror 12b in the first mode becomes constant regardless of the operating state of the lever portion 15a, and the driver can visually recognize the virtual image display behind.

Although the configuration in which the translucent cover 16 is provided in the opening 11b of the first housing 11 has been described here, the translucent cover 16 may be configured such that the reflectance can be changed by, for example, a liquid crystal display. In this case, in the second mode, the display control unit 22 controls the reflectance of the liquid crystal according to the brightness of the rear image captured by the image pickup unit 31. With such a configuration, the second mode may be provided with an automatic antiglare function. As a result, the anti-glare function in the second mode can be automatically realized. Further, also in this configuration, when switching from the second mode to the first mode, the display control unit 22 controls so that the reflectance control of the liquid crystal is turned off.

As shown in FIGS. 1A to 6B, the drive control unit 17 executes a plurality of operation modes by controlling the drive unit 18. In the present embodiment, the drive control unit 17 can execute a desired mode among the first mode and the second mode as a plurality of operation modes.

For example, the drive control unit 17 switches between the first mode and the second mode by controlling the drive unit 18. Specifically, when the drive control unit 17 acquires a control instruction for switching the optical body 12 from the first state to the second state (hereinafter, may be referred to as a first control instruction) from the input operation unit 32, the drive control unit 18 receives the control instruction 18 from the input operation unit 32. By controlling the rotation of the optical body 12 via the above, the optical body 12 is rotated so that the flat mirror surface 12c1 of the plane mirror 12c faces the driver side. That is, the drive control unit 17 switches from the first mode to the second mode. As a result, the flat mirror surface 12c1 of the plane mirror 12c faces the driver side.

Further, when the drive control unit 17 acquires a control instruction for switching the optical body 12 from the second state to the first state (hereinafter, may be referred to as a second control instruction) from the input operation unit 32, the drive control unit 17 passes through the drive unit 18. By controlling the rotation of the optical body 12, the optical body 12 is rotated so that the concave mirror surface 12b1 of the concave mirror 12b faces the driver side. That is, the drive control unit 17 switches from the second mode to the first mode. As a result, the concave mirror surface 12b1 of the concave mirror 12b faces the driver side.

The drive control unit 17 does not have to output a control instruction for switching the optical body 12 from the second state to the first state when the display surface 21a of the display device 20 fails. In this case, the drive control unit 17 may switch to the second state if the optical body 12 is in the first state. Further, the drive control unit 17 may be realized by acquiring a failure signal from the display device 20.

The drive unit 18 is an actuator that rotates the optical body 12. The drive unit 18 controls the rotation of the optical body 12 by switching the optical body 12 between the first state and the second state in response to the control instruction acquired from the drive control unit 17. When the drive unit 18 acquires the first control instruction, the drive unit 18 rotates the optical body 12 around the axis O to switch the optical body 12 from the first state to the second state. When the drive unit 18 acquires the second control instruction, the drive unit 18 rotates the optical body 12 around the axis O to switch the optical body 12 from the second state to the first state.

[Input operation unit 32]
The input operation unit 32 is an input interface for receiving an input operation by the driver for executing the first mode or the second mode. The input operation unit 32 outputs a control instruction corresponding to the operation input by the driver's operation to the drive control unit 17. The input operation unit 32 may be, for example, a dedicated switch provided on the center console.

<Processing>
FIG. 8 is a flowchart illustrating the processing of the rearview mirror 10 of the display system 1 according to the first embodiment.

First, as shown in FIG. 8, the input operation unit 32 receives an input operation by the driver for executing the first mode or the second mode. The input operation unit 32 outputs a control instruction corresponding to the input operation to the drive control unit 17 (S11).

Next, the drive control unit 17 determines whether or not a control instruction for executing the first mode has been acquired (S12).

When the drive control unit 17 acquires a control instruction to execute the first mode (YES in S12), the drive control unit 17 executes the first mode (S13). For example, if the second mode is executed, the drive control unit 17 switches from the second mode to the first mode. Specifically, when the drive control unit 17 acquires a control instruction for switching the optical body 12 from the second state to the first state from the input operation unit 32, the drive control unit 17 controls the drive unit 18 to rotate the optical body 12. .. When the drive unit 18 obtains the instruction from the drive control unit 17, the drive unit 18 rotates the optical body 12 by about 180 ° so that the concave mirror surface 12b1 of the concave mirror 12b faces the driver side. As a result, in the optical body 12, the concave mirror surface 12b1 of the concave mirror 12b faces the driver side. Then, the display system 1 ends the process.

When the drive control unit 17 acquires a control instruction to execute the second mode (NO in S12), the drive control unit 17 executes the second mode (S14). For example, if the first mode is executed, the drive control unit 17 switches from the first mode to the second mode. Specifically, when the drive control unit 17 acquires a control instruction for switching the optical body 12 from the first state to the second state from the input operation unit 32, the drive control unit 17 controls the drive unit 18 to rotate the optical body 12. .. When the drive unit 18 obtains the instruction from the drive control unit 17, the drive unit 18 rotates the optical body 12 by about 180 ° so that the flat mirror surface 12c1 of the plane mirror 12c faces the driver side. As a result, in the optical body 12, the flat mirror surface 12c1 of the plane mirror 12c faces the driver side. Then, the display system 1 ends the process.

<Example>
FIG. 6C is a cross-sectional view illustrating the display system 1 according to the embodiment of the first embodiment and exemplifying the case where the rearview mirror 10 is viewed from above. FIG. 6D is a cross-sectional view illustrating the display system 1 according to the embodiment of the first embodiment and exemplifying the case where the rearview mirror 10 is viewed from above. FIG. 7B is a perspective view illustrating the optical body 12 of the display system 1 according to the embodiment of the first embodiment.

In this embodiment, the distance between the plane mirror 12c and the concave mirror 12b at the end of the optical body 12 on the side closer to the driver (right side in FIGS. 6C and 6D) is on the side farther from the driver (left side in FIGS. 6C and 6D). ) May be smaller than the distance between the plane mirror 12c and the concave mirror 12b. As shown in FIG. 7B, when the optical body 12 is viewed from above, the length D2 of the right edge in the left-right direction may be shorter than the length D4 of the left edge. Further, when the optical body 12 is viewed from below, the length D1 of the right edge in the left-right direction may be shorter than the length D3 of the left edge. In this case, the length L2 of the first housing 11 on the right side in the front-rear direction can be made shorter than the length L1 of the first housing 11 on the left side.

<Effect>
The operation and effect of the display system 1 in the present embodiment will be described.

In the display system 1 according to the present embodiment, the display device 20 (display unit) mounted on the moving body and the concave mirror for displaying the display image indicated by the image light emitted by the display device 20 in the first mode as a virtual image. 12b and a plane mirror 12c for reflecting a rear image incident on the moving body in the second mode are provided, and when the moving body is viewed from above, a straight line connecting the center of the display device 20 and the center of the concave mirror 12b is formed. The display device 20 and the concave mirror 12b are arranged so as to have a predetermined angle δ with respect to the front-rear direction of the moving body. The normal direction of the plane mirror surface of the plane mirror 12c at the time of functioning is non-parallel to each other.

According to this, the straight line connecting the display device 20 and the concave mirror 12b is tilted with respect to the front-rear direction of the moving body by a predetermined angle δ so as not to coincide with the front-rear direction of the moving body. Therefore, even if the external light such as the headlight of the following vehicle is incident on the concave mirror 12b, the reflection in the direction of the driver's eyes can be suppressed, so that the external light can be reflected by the concave mirror 12b and enter the driver's field of view. Sex can be suppressed.

Further, the normal direction at the center of the concave mirror surface 12b in the first mode and the normal direction of the flat mirror surface 12c in the second mode are non-parallel. Therefore, for example, the concave mirror 12b and the plane mirror 12c are arranged so that the reflection direction in which the image light is incident and reflected on the concave mirror surface 12b and the reflection direction in which the light is incident and reflected on the flat mirror surface 12c reach the driver. be able to. Therefore, when the mode is switched between the first mode and the second mode, the amount of position adjustment of the concave mirror 12b and the plane mirror 12c in the horizontal direction can be reduced.

Therefore, it is possible to prevent the external light from being reflected toward the driver, and it is possible to easily switch between the concave mirror 12b and the plane mirror 12c. In particular, in this display system 1, it is possible to easily adjust the display mode by the image light and the light from the outside.

9A and 9B show the display system 1 as viewed from above. Further, FIGS. 7A and 7B show a case where the display system 1 is viewed from above.

FIG. 9A is a diagram showing the position of the display device with respect to the optical body and the driver. FIG. 9B is another view showing the position of the display device with respect to the optics and the driver.

In FIG. 9A, the display device is arranged so that the emission direction of the image light emitted by the display device and the traveling direction of the moving body coincide with each other, that is, between the straight lines connecting the center of the optical body and the center of the driver. No display device is placed in. On the other hand, in FIG. 9B, a display device is arranged between the optical body and the driver, and the normal direction of the concave mirror surface and the normal direction of the flat mirror surface coincide with each other. In this configuration, the position of the optical body must be adjusted in the horizontal direction in order for the driver to see the display image and the rear image each time the mode is switched between the first mode and the second mode.

The reason for this is as follows. In order for the concave mirror to reflect the image light emitted by the display device toward the driver, the angle between the normal direction at the center of the concave mirror surface provided on the optical body and the reflection direction by the concave mirror tends to be small. Therefore, when simply switching from the first mode to the second mode, the straight line connecting the center of the flat mirror surface and the center of the driver substantially coincides with the normal of the center of the flat mirror surface, so that the flat mirror surface is from the rear of the moving body. It becomes difficult to reflect the light (rear image) toward the observer.

As a result, the display image indicated by the image light on the optical body and the rear image indicated by the light behind the moving body are properly reflected and difficult to see for the driver. Therefore, the driver needs to operate the optical body so that the display image or the rear image can be seen, and finely adjust the position of the optical body.

Therefore, in the display system 1 of the present embodiment, the display device 20, the concave mirror 12b for displaying the display image indicated by the image light emitted by the display device 20 in the first mode, and the concave mirror 12b in the second mode. A plane mirror 12c for reflecting a rear image incident on a moving body is provided. The display device 20 is arranged at least closer to the driver than the concave mirror 12b in the front-rear direction of the moving body, and has a normal direction H1 at the center of the concave mirror surface 12b1 of the concave mirror 12b when the first mode is functioning. The normal direction H2 of the flat mirror surface 12c1 of the plane mirror 12c when the second mode is functioning is non-parallel to each other.

According to this, the normal direction H1 at the center of the concave mirror surface 12b1 in the first mode and the normal direction H2 of the flat mirror surface 12c1 in the second mode are non-parallel. Therefore, for example, the concave mirror 12b and the plane mirror 12c are arranged so that the reflection direction in which the image light is incident and reflected on the concave mirror surface 12b1 and the reflection direction in which the light is incident and reflected on the flat mirror surface 12c1 reach the driver. be able to. Therefore, when the first mode and the second mode are switched, the amount of position adjustment in the horizontal direction of the display system 1 can be reduced.

Therefore, it is possible to easily adjust the display mode by the image light and the light from the outside.

Further, in the display system 1 of the present embodiment, the predetermined angle δ is the distance (2X) between the eyes of the occupant (driver) of the moving body who visually recognizes the concave mirror 12b when the moving body is viewed from above, and the eyes. From the lower limit angle γ, which is the angle indicated by the straight line connecting the center of the concave mirror 12b and the eyes with respect to the straight line obtained based on the length (L) of the straight line connecting the midpoint between the eyes and the center of the concave mirror 12b. It is an angle between a straight line in the left-right direction with respect to the traveling direction of the moving body passing through the center of the concave mirror 12b and an upper limit angle which is an angle indicated by a straight line in the front-rear direction of the moving body passing through the center of the concave mirror 12b.

According to this, by tilting the straight line connecting the display device 20 and the concave mirror 12b with respect to the front-rear direction of the moving body within the range of the predetermined angle, the outside light is directed in a direction deviated from the direction of the driver's eyes. Since it is reflected, the possibility that the external light is reflected by the concave mirror 12b and enters the driver's field of view can be further suppressed.

Further, in the display system 1 of the present embodiment, the tangent line at the center of the display device 20 and the tangent line at the center of the concave mirror 12b are parallel to each other.

According to this, even if the display device 20 is arranged so that the straight line connecting the display device 20 and the concave mirror 12b is tilted with respect to the front-rear direction of the moving body, the optical path length between the display device 20 and the concave mirror 12b is substantially equal. Therefore, it is possible to suppress distortion of the image reflected on the concave mirror 12b and which can be seen by the driver.

Further, in the display system 1 of the present embodiment, the display device 20 is arranged on the driver side of the moving body with respect to a straight line passing through the center of the concave mirror 12b parallel to the front-rear direction of the moving body.

According to this, since the angle between the display device 20, the concave mirror 12b, and the straight line connecting the display device 20 and the driver is reduced, the difference in the optical path length is suppressed as a whole, and the image distortion is reduced. Can be done.

Further, in the display system 1 of the present embodiment, the concave mirror 12b and the planar mirror 12c are housed in the first housing 11, and the first housing 11 has a rotating shaft 12d for internally rotating the concave mirror 12b and the planar mirror 12c. ..

According to this, the concave mirror 12b and the plane mirror 12c can be rotated by rotating the rotation shaft 12d. Therefore, the first mode and the second mode can be easily switched only by rotating the rotation shaft 12d. Further, the concave mirror surface 12b1 and the plane mirror 12c are arranged so that the reflection direction in which the image light is incident and reflected on the concave mirror surface 12b1 and the reflection direction in which the light is incident and reflected on the flat mirror surface 12c1 reach the driver. In any case, the driver can be irradiated with the image light by the concave mirror surface 12b1 and the light by the flat mirror surface 12c1 only by rotating the rotation amount of the rotation shaft 12d by the same amount.

Further, the display system 1 in the present embodiment includes an optical body 12 having a concave mirror 12b and a plane mirror 12c. The plane mirror 12c is arranged on the opposite side of the concave mirror 12b so that the flat mirror surface 12c1 faces the outside, and the optical body 12 is wedge-shaped when viewed from the vertical direction of the moving body.

According to this, the plane mirror 12c and the concave mirror 12b can be arranged integrally on the front and back sides, and the posture of the concave mirror 12b can be tilted in the front-rear direction of the moving body along the horizontal plane with respect to the posture of the plane mirror 12c. Therefore, when the first mode and the second mode are switched, the amount of position adjustment in the horizontal direction of the display system 1 can be reduced.

Further, in the display system 1 of the present embodiment, the distance between the plane mirror 12c and the concave mirror 12b at the end of the optical body 12 on the side closer to the driver in the left-right direction with respect to the traveling direction of the moving body is relative to the traveling direction of the moving body. It is smaller than the distance between the plane mirror 12c and the concave mirror 12b at the end far from the driver in the left-right direction.

According to this, when the optical body 12 is arranged diagonally forward with respect to the driver, if the distance between the ends of the optical body 12 on the driver side is smaller than the distance between the optical bodies 12 on the opposite side, FIG. 6A And as shown in FIG. 6B, the length L1 on the right side (driver side) of the first housing 11 can be made smaller than the length L2 on the left side (far side from the driver) of the first housing 11. can. Therefore, the area of the console of the mobile body on which the display system 1 is arranged can be effectively utilized.

(Modification 1 of Embodiment 1)
The display system 1 of this modification will be described.

FIG. 10A is a perspective view illustrating the optical body 112a of the display system 1 according to the first modification of the first embodiment.

As shown in FIG. 10A, this modification differs from the first embodiment in that the optical body 112a is wedge-shaped when viewed from the left-right direction. Unless otherwise specified, the other configurations in this modification are the same as those in the first embodiment, and the same configurations are designated by the same reference numerals and detailed description of the configurations will be omitted.

When the optical body 112a is viewed from above, the length D2 of the edge on one side in the left-right direction is substantially the same as the length D4 of the edge on the other side. Further, when the optical body 112a is viewed from below, the length D1 of the edge on one side in the left-right direction is substantially the same as the length D3 of the edge on the other side. The lengths D2 and D4 are longer than the lengths D1 and D3. That is, the optical body 112a is wedge-shaped when viewed from the left-right direction with respect to the traveling direction of the moving body.

As described above, in the display system 1 in the present modification, the optical body 112a having the concave mirror 12b and the plane mirror 12c is provided, and the plane mirror 12c is arranged so as to face the concave mirror 12b on the opposite side to the concave mirror 12b and the plane mirror 12c. Is wedge-shaped when viewed from the left-right direction with respect to the traveling direction of the moving body.

According to this, the plane mirror 12c and the concave mirror 12b can be arranged integrally on the front and back sides, and the posture of the concave mirror 12b is tilted in the front-rear direction of the moving body along the vertical plane of the flat mirror surface 12c1 with respect to the posture of the plane mirror 12c. be able to. Therefore, when the first mode and the second mode are switched, the amount of position adjustment in the horizontal direction of the display system 1 can be reduced.

Also in this modified example, the same action and effect as described above are obtained.

(Modification 2 of Embodiment 1)
The display system 1 of this modification will be described.

FIG. 10B is a perspective view illustrating the optical body 112b of the display system 1 according to the second modification of the first embodiment.

As shown in FIG. 10B, this modification differs from the first embodiment in that the optical body 112b is wedge-shaped when viewed from the vertical direction and the horizontal direction. Unless otherwise specified, the other configurations in this modification are the same as those in the first embodiment, and the same configurations are designated by the same reference numerals and detailed description of the configurations will be omitted.

When the optical body 112b is viewed from above, the length D2 of the edge on one side in the left-right direction is shorter than the length D4 of the edge on the other side. Further, when the optical body 112b is viewed from below, the length D1 of the edge on one side in the left-right direction is shorter than the length D3 of the edge on the other side. That is, the optical body 112b is wedge-shaped when viewed from the vertical direction of the moving body.

Further, the length D2 of the upper end edge when the optical body 112b is viewed from one side in the left-right direction is longer than the length D1 of the lower end edge. Further, the length D4 of the upper end edge when the optical body 112b is viewed from the other side in the left-right direction is longer than the length D3 of the lower end edge. That is, the optical body 112b is wedge-shaped when viewed from the left-right direction with respect to the traveling direction of the moving body.

Also in this modified example, the same action and effect as described above are obtained.

(Modification 3 of Embodiment 1)
The display system 1 of this modification will be described.

FIG. 10C is a perspective view illustrating the optical body 112c of the display system 1 according to the third modification of the first embodiment.

As shown in FIG. 10C, this modification differs from the first embodiment in that the concave mirror, the planar mirror, and the support are an integrated optical body 112c. Unless otherwise specified, the other configurations in this modification are the same as those in the first embodiment, and the same configurations are designated by the same reference numerals and detailed description of the configurations will be omitted.

The optical body 112c has a concave mirror surface 12b1 formed on one surface and a flat mirror surface 12c1 which is a surface opposite to the concave mirror surface 12b1 and is formed on the other surface. The concave mirror surface 12b1 and the flat mirror surface 12c1 are mirror-reflected by being polished, for example. That is, the member constituting the concave mirror surface 12b1 and the member constituting the flat mirror surface 12c1 are the same body, and are not separate members that can be separated.

Also in this modified example, the same action and effect as described above are obtained.

(Modification 4 of Embodiment 1)
The display system 1 of this modification will be described.

FIG. 11A shows the display system 1 according to the fourth modification of the first embodiment. When the rearview mirror 10a is viewed from above, the optical body 12 is set to the first state as the first mode, and the image light is emitted from the rearview mirror 10a. It is sectional drawing which illustrates the state of making it incident on, and reflecting it. FIG. 11B shows the display system 1 according to the fourth modification of the first embodiment. When the rearview mirror 10a is viewed from above, the optical body 12 is set to the second state as the second mode, and the light behind the moving body is emitted. It is sectional drawing which illustrates the state of making it incident on the rearview mirror 10a and reflecting it.

As shown in FIGS. 11A and 11B, in this modification, the axis O of the rotation axis 12d is non-parallel to the plane orthogonal to the normal line of the center of the concave mirror surface 12b1 and the plano mirror surface 12c1. It is different from the first form. Unless otherwise specified, the other configurations in this modification are the same as those in the first embodiment, and the same configurations are designated by the same reference numerals and detailed description of the configurations will be omitted.

The optical body 12 has a rectangular shape when viewed from the vertical direction and the horizontal direction. Specifically, in the concave mirror 12b and the plane mirror 12c, the normal direction H of the flat mirror surface 12c1 and the normal direction H at the center of the concave mirror surface 12b1 are parallel. In the present embodiment, the concave mirror 12b and the planar mirror 12c are supported by the support 12a in a posture in which the normal direction H of the flat mirror surface 12c1 and the normal direction H at the center of the concave mirror surface 12b1 are parallel to each other.

Further, the flat mirror surface 12c1 of the plane mirror 12c and the axial direction of the rotating shaft 12d are not parallel to each other. Further, the plane orthogonal to the normal direction H at the center of the concave mirror surface 12b1 is also non-parallel to the axial direction of the rotation axis 12d. That is, the axial direction of the rotating shaft 12d is inclined with respect to the plane orthogonal to the normal direction H at the center of the concave mirror surface 12b1 and the flat mirror surface 12c1.

As described above, in the display system 1 of the present embodiment, the plane mirror 12c is arranged so as to face the concave mirror 12b on the opposite side, and the concave mirror 12b and the plane mirror 12c are arranged so as to face the normal direction H of the flat mirror surface 12c1. The normal direction H at the center of the concave mirror surface 12b1 is parallel, and the flat mirror surface 12c1 of the plane mirror 12c and the axial direction of the rotation axis 12d are non-parallel.

According to this, if the normal direction H at the center of the plane mirror 12c and the normal direction H of the concave mirror 12b are parallel, the optical body 12 can be easily manufactured, so that the manufacturing cost of the optical body 12 is unlikely to increase. Become. Further, by simply making the flat mirror surface 12c1 of the plane mirror 12c and the axial direction of the rotating shaft 12d non-parallel, the normal direction H at the center of the concave mirror 12b when the first mode is functioning and the normal direction H at the center of the concave mirror 12b when the second mode is functioning are used. The normal direction H of the plane mirror 12c can be easily made non-parallel. Therefore, the amount of position adjustment in the horizontal direction of the display system 1 can be reduced.

Also in this modified example, the same action and effect as described above are obtained.

(Embodiment 2)
<Configuration: Display system 1a>
The display system 1a of the present embodiment will be described.

FIG. 12 is a perspective view illustrating the display system 1a according to the second embodiment. FIG. 13 is a cross-sectional view illustrating a state in which the plane mirror 212c of the display system 1a according to the second embodiment is in the released state. FIG. 14 is a cross-sectional view illustrating a state in which the plane mirror 212c of the display system 1a according to the second embodiment is in a shielded state.

As shown in FIGS. 12 to 14, the present embodiment is different from the first embodiment in that the plane mirror 212c is switched between the released state and the shielded state. Unless otherwise specified, the other configurations in this modification are the same as those in the first embodiment, and the same configurations are designated by the same reference numerals and detailed description of the configurations will be omitted. The state in which the plane mirror 212c is released corresponds to the first mode, and the state in which the plane mirror 212c is shielded corresponds to the second mode.

The display system 1a includes a second housing 211, a display device 20, an intermediate reflection member 225, a concave mirror 212b, a plane mirror 212c, and a half mirror 216.

The second housing 211 is an accommodating body made of, for example, a molded product of synthetic resin. The second housing 211 forms an accommodation space 11a inside, and is formed in a rectangular parallelepiped shape that is long in the left-right direction and is opened by the driver. The second housing 211 is formed so that the dimensions in the left-right direction with respect to the traveling direction of the moving body are larger than the dimensions in the vertical direction and the dimensions in the front-rear direction. The second housing 211 houses the display device 20, the concave mirror 212b, the curved mirror 212c, and the half mirror 216.

The second housing 211 rotatably holds the plane mirror 212c in the accommodation space 11a in a state of being accommodated in the accommodation space 11a. Specifically, the side walls on both sides of the second housing 211 in the left-right direction rotatably hold the plane mirror 212c. The second housing 211 has a holding structure for holding the plane mirror 212c in both the shielded state and the released state of the opening 11b by the plane mirror 212c.

The second housing 211 is formed with a plurality of guide grooves into which the first protrusion 212e1 and the second protrusion 212e2 of the plane mirror 212c are inserted. The plurality of guide grooves include a first guide groove 211e into which the first protrusion 212e1 of the plane mirror 212c is inserted, and a second guide groove 211d into which the second protrusion 212e2 of the plane mirror 212c is inserted. The first guide groove 211e is formed on the inner side surface of the second housing 211 along the front-rear direction. The second guide groove 211d is formed on the inner side surface of the second housing 211 along the vertical direction. Then, the positions of the first protrusion 212e1 and the second protrusion 212e2 change (slide) inside the first guide groove 211e and the second guide groove 211d, so that the state of the plane mirror 212c is released from the released state or the shielded state. Switch to.

Further, the second housing 211 holds a half mirror 216 between the concave mirror 212b and the plane mirror 212c. Specifically, in the second housing 211, the half mirror 216 is placed at a position that does not hinder the rotation of the plane mirror 212c in the accommodation space 11a in a state where the intermediate reflection member 225 and the half mirror 216 are accommodated in the accommodation space 11a. keeping. Details of the half mirror 216 will be described later.

The display device 20 is fixed to the upper surface in the second housing 211, overlaps with the intermediate reflection member 225 when viewed from above, and is arranged between the opening 11b of the second housing 211 and the concave mirror 212b. .. That is, the display device 20 is arranged above the intermediate reflection member 225 and fixed to the second housing 211 so that the display surface 21a faces the intermediate reflection member 225. The display device 20 emits image light that forms an image displayed on the display surface 21a. The image light emitted from the display surface 21a of the display device 20 is incident on the intermediate reflection member 225 and reflected, further incident on the half mirror 216 and reflected, further incident on the concave mirror 212b and reflected, and then the half mirror 216. Is transmitted to the outside of the second housing 211, so that the light is incident on the driver's eyes.

The intermediate reflection member 225 is, for example, a plane mirror 212c, and is arranged below the second housing 211 with the reflection surface 225a facing upward. The intermediate reflection member 225 is arranged below the display device 20, and reflects the image light emitted by the display device 20 on the half mirror 216.

The concave mirror 212b is a curved plate-shaped mirror that is accommodated and fixed in the accommodation space 11a of the second housing 211 so that the concave mirror surface 212b1 faces the opening 11b side of the second housing 211. In the present embodiment, the concave mirror 212b is arranged at the bottom of the second housing 211.

The plane mirror 212c is movable and is housed in the second housing 211 in the first mode. That is, the plane mirror 212c is a flat mirror that is accommodated and fixed in the second housing 211 so as to cover the opening 11b of the second housing 211. The plane mirror 212c is arranged between the concave mirror 212b and the driver when viewed from the vertical direction of the moving body.

Further, the plane mirror 212c is held in the second housing 211 so that the opening 11b of the second housing 211 can be put into a shielding state or released. The shielding state is a state in which the image light of the display device 20 is shielded from being emitted to the outside of the second housing 211, and the light incident on the second housing 211 is reflected toward the driver's eyes. be. In the shielded state, the light behind the moving body is reflected by the plane mirror 212c and then enters the driver's eyes, so that the driver can visually recognize the rear image indicated by the light.

The release state is a state in which the image light is released from the second housing 211 to the outside (a state in which the shielding state is released), and the image light of the display device 20 is emitted to the outside of the second housing 211. Is. In the released state, the image light output from the display surface 21a of the display device 20 is reflected by the concave mirror 212b and then enters the driver's eyes, so that the driver can visually recognize the display image indicated by the image light. ..

Further, when the display system 1a is viewed from the left-right direction, the normal direction H1 of the flat mirror surface 212c1 of the plane mirror 212c in the second mode in which the plane mirror 212c is in the shielding state is in the first mode in which the plane mirror 212c is in the released state. It is tilted by 10 ° or more with respect to the optical axis direction of the light reflected by the concave mirror 212b in the above. That is, as shown in FIG. 14, the angle γ between the normal direction H1 and the optical axis direction is 10 ° or more. As a result, it is possible to prevent an object existing behind the moving body, for example, the ceiling portion 4, from being reflected on the plane mirror 212c.

The plane mirror 212c may be composed of a liquid crystal panel. In this case, the liquid crystal panel is controlled by the display control unit 22 to change the transmittance of the incident light. For example, the plane mirror 212c may execute a reflection mode for reflecting light and a transmission mode for transmitting image light. The light transmittance of the plane mirror 212c changes according to the applied voltage. That is, the plane mirror 212c can take either a shielding state that shields a part of light or a releasing state that cancels the shielding of light, depending on the applied voltage. The shielded state is a state in which the transmittance of visible light in the liquid crystal mirror is relatively small. The released state is a state in which the transmittance of visible light in the liquid crystal mirror is relatively large. With such a configuration, the plane mirror 212c only needs to be fixed at the position shown in FIG. 14, so that it is not necessary to hold the plane mirror 212c rotatably. Therefore, a structure for rotating is not required.

The half mirror 216 is a flat plate-shaped member arranged between the concave mirror 212b and the plane mirror 212c in the second housing 211. Specifically, the half mirror 216 has a second so that the inner side surface faces the concave mirror surface 12b1 of the concave mirror 212b and the outer surface opposite to the inner side surface faces the plane mirror 212c in the shielded state. It is arranged and fixed in the housing 211. The half mirror 216 is arranged obliquely with respect to the vertical direction so that the lower end of the half mirror 216 protrudes behind the upper end. In the present embodiment, the inner side surface, which is a reflecting surface that reflects the image light from the display device 20, is a flat surface, but the inner side surface may be a curved surface such as a free curved surface. By making the inner surface of the half mirror 216 a free curved surface, it is possible to reduce the distortion of the image formed on the reflecting surface, reduce the curvature of the image plane, and improve the resolution.

The half mirror 216 has a function of transmitting light that transmits a part of light such as image light and light reflecting property that reflects another part of the light. The half mirror 216 is composed of a flat beam splitter having a light transmittance and a reflectance of several tens of percent.

In addition, also in this embodiment, the plane mirror 212c may have an antiglare function. In this case, the lever portion 15a described in the first embodiment may be provided, and the inclination of the second housing 211 may be changed by operating the lever portion 15a.

<Effect>
The operation and effect of the display system 1a in the present embodiment will be described.

As described above, in the display system 1a of the present embodiment, the plane mirror 212c and the concave mirror 212b are housed in the second housing 211, and when viewed from the vertical direction of the moving body, the plane mirror 212b is between the concave mirror 212b and the driver. 212c is arranged.

According to this, the plane mirror 212c can be arranged on the driver side, and the concave mirror 212b can be arranged on the back side of the plane mirror 212c. Therefore, since the light can be incident on the entire area of the flat mirror surface 212c1 of the plane mirror 212c, it is difficult for the second housing 211 to cast a shadow on the flat mirror surface 212c1.

Further, in the display system 1a of the present embodiment, the plane mirror 212c is fixed to the second housing 211 to change the light transmittance.

According to this, since the light transmittance of the plane mirror 212c can be changed, for example, even when a dazzling light such as a headlight of a following moving body is incident at night, the glare felt by the driver can be suppressed. Can be done.

Further, in the display system 1a of the present embodiment, the normal direction H1 of the plane mirror 212c in the second mode is tilted by 10 ° or more from the optical axis direction of the light reflected by the concave mirror 212b in the first mode.

According to this, the normal direction of the plane mirror 212c can be tilted by 10 ° or more from the optical axis direction of the light reflected by the concave mirror 212b. Therefore, it is possible to suppress the reflection of the object (rear image) existing behind the moving body.

Further, in the display system 1a of the present embodiment, the plane mirror 212c is movable and is housed in the second housing 211 in the first mode.

According to this, since the plane mirror 212c can be moved, the second mode and the first mode can be easily switched.

(Modified Example of Embodiment 2)
The display system 1b of the present embodiment will be described.

FIG. 15 is a cross-sectional view illustrating a state in which the plane mirror 232c of the display system 1b according to the modified example of the second embodiment is in the released state. FIG. 16 is a cross-sectional view illustrating a state in which the plane mirror 232c of the display system 1b according to the modified example of the second embodiment is in a shielded state.

As shown in FIGS. 15 and 16, the modified example differs from the second embodiment in that the plane mirror 232c is arranged below the second housing 231 in the released state. Further, this modification is different from the second embodiment in that the intermediate reflection member is not provided in the second housing 231. Unless otherwise specified, the other configurations in this modification are the same as those in the second embodiment, and the same configurations are designated by the same reference numerals and detailed description of the configurations will be omitted.

The second housing 211 is formed with a plurality of guide grooves into which the first protrusion 212e1 and the second protrusion 212e2 of the plane mirror 212c are inserted. The plurality of guide grooves include a first guide groove 211e into which the first protrusion 212e1 of the plane mirror 212c is inserted, and a second guide groove 211d into which the second protrusion 212e2 of the plane mirror 212c is inserted.

The plurality of guide grooves include a first guide groove 231e into which the first protrusion 212e1 of the plane mirror 232c is inserted, and a second guide groove 231d into which the second protrusion 212e2 of the plane mirror 232c is inserted. By changing the positions of the first protrusion 212e1 and the second protrusion 212e2 inside the first guide groove 231e and the second guide groove 231d, the state of the plane mirror 212c is switched between the released state and the shielded state.

The plane mirror 232c is movable and is housed in the second housing 231 in the first mode. That is, the plane mirror 232c is a flat mirror that is accommodated and fixed in the second housing 211 so as to cover the opening 11b of the second housing 231. The plane mirror 232c is held in the second housing 231 so that the opening 11b of the second housing 231 can be put into a shielding state or released.

The display device 20 is fixed to the upper surface of the second housing 231, overlaps the half mirror 216 when viewed from above, and is arranged between the opening 11b of the second housing 231 and the concave mirror 212b. That is, the display device 20 is arranged above the half mirror 216 and fixed to the second housing 231 so that the display surface 21a faces the half mirror 216.

The image light emitted from the display surface 21a of the display device 20 is incident on the half mirror 216 and reflected, further incident on the concave mirror 212b and reflected, and then transmitted through the half mirror 216 to the outside of the second housing 231. By emitting light, it is incident on the driver's eyes.

The half mirror 216 of this modification is on the inner side surface (the surface on the concave mirror 212b side) with respect to the incident direction of the image light from the display surface 21a of the display device 20 and the incident direction of the image light from the concave mirror surface 212b1. They are arranged so that their normal directions intersect diagonally. Further, the half mirror 216 is oblique to the vertical direction so that the lower end of the half mirror 216 protrudes forward from the upper end with respect to the plane perpendicular to the normal direction at the center of the concave mirror surface 212b1 of the concave mirror 212b. Be placed.

Also in this modified example, the same action and effect as described above are obtained.

(Embodiment 3)
<Configuration: Display system 1c>
The display system 1c of the present embodiment will be described.

FIG. 17 shows a display system 1c according to the third embodiment, and is a cross-sectional view illustrating a case where the rearview mirror 10 is viewed from above when the state of the plane mirror 312c is set to the shielded state.

As shown in FIG. 17, in the present embodiment, the plane mirror 312c has a Fresnel reflecting surface 312c1. This point is different from the second embodiment. Unless otherwise specified, the other configurations in the present embodiment are the same as those in the second embodiment and its modifications, and the same configurations are designated by the same reference numerals and detailed description of the configurations will be omitted.

The rotating planar mirror 312c has a Fresnel reflective surface 312c1. That is, the flat mirror surface is composed of one or more Fresnel reflecting surfaces 312c1. The Fresnel reflecting surface 312c1 of the present embodiment is a plurality of grooves along the sawtooth-shaped vertical direction when the plane mirror 312c is viewed from the vertical direction. The Fresnel reflecting surface 312c1 is a vertically long strip-shaped plane formed on the plane mirror 312c.

The angle α between the normal direction H1 and the front-rear direction at the center of the concave mirror surface 212b1 is larger than the angle β between the normal direction H2 and the front-rear direction of the Fresnel reflection surface 312c1. In particular, the angle α between the normal direction H1 and the front-rear direction at the center of the concave mirror surface 212b1 is preferably twice the angle between the normal direction H2 and the front-rear direction of the Fresnel reflection surface 312c1.

<Effect>
The operation and effect of the display system 1c in the present embodiment will be described.

Thus, in the display system 1c of the embodiment, the plane mirror 312c has a Fresnel reflective surface 312c1.

According to this, the plane mirror 312c can control the light distribution and reflect the light incident from the rear of the moving body. For this reason, the display is compared with a configuration in which the tangent line in the specified direction of the flat mirror surface at the center of the flat mirror surface, which is a single surface, and the tangent line in the specified direction of the concave mirror surface at the center of the concave mirror surface are arranged so as to be non-parallel. It is possible to suppress the increase in size of the system 1c.

Also in this embodiment, the same action and effect as described above are obtained.

Even in the display system 1 of the first embodiment, the plane mirror 12c may have a Fresnel reflecting surface. In this case as well, the same action and effect as described above are obtained.

(Modified Example of Embodiment 3)
<Configuration: Display system 1d>
The display system 1d of this modification will be described.

FIG. 18 shows a display system 1d according to a modified example of the third embodiment, and is a cross-sectional view illustrating a case where the rearview mirror 10 is viewed from above when the state of the plane mirror 332c is set to the shielding state.

As shown in FIG. 18, in the present modification, the plane mirror 312c of the third embodiment does not have the Fresnel reflecting surface 312c1 and instead, the posture of the plane mirror 332c can be adjusted. It's different. Unless otherwise specified, the other configurations in this modification are the same as those in the third embodiment, and the same configurations are designated by the same reference numerals and detailed description of the configurations will be omitted.

The rotating plane mirror 332c has a posture adjusting unit 333 that adjusts the posture with respect to the concave mirror 212b. The plane mirror 332c is attached via a posture adjusting portion 333 provided on a frame body (not shown). Then, the frame body is provided with the first protrusion 212e1 and the second protrusion 212e2, and these are inserted into the first guide groove 211e and the second guide groove 211d, respectively. The posture adjusting unit 333 is, for example, a rotating shaft and a hinge provided in the second housing 311 so as to be swingable with a direction substantially parallel to the vertical direction as the axis P. Therefore, the posture adjusting unit 333 can rotate the plane mirror 332c so as to change the angle of the flat mirror surface 332c1 with respect to the normal direction H2 at the center of the concave mirror surface 212b1. Specifically, the posture adjusting unit 333 has a range in which the angle β formed by the normal direction H2 of the flat mirror surface 332c1 and the front-rear direction is smaller than the angle α formed by the normal direction H1 and the front-rear direction at the center of the concave mirror surface 212b1. The concave mirror surface 212b1 is rotated by.

<Effect>
The operation and effect of the display system 1d in the present embodiment will be described.

Further, in the display system 1d of the present embodiment, the plane mirror 332c has a posture adjusting unit 333 for adjusting the posture with respect to the concave mirror surface 212b1.

According to this, since the posture of the plane mirror 332c with respect to the concave mirror 212b can be arbitrarily adjusted, the degree of freedom of adjustment of the display system 1d can be increased when the second mode and the first mode are switched.

Also in this modified example, the same action and effect as described above are obtained.

(Other modifications, etc.)
Although the present disclosure has been described above based on the modified examples of the first to third embodiments, the first to third embodiments, and the modified examples 2 to 4 of the first embodiment, the present disclosure describes the first to fourth embodiments. 3. It is not limited to the modified examples of the first to third embodiments and the modified examples 2 to 4 of the first embodiment.

For example, in the display system according to the above-described first to third embodiments, the first to third modifications of the first and third embodiments, and the second to fourth modifications of the first embodiment, the optical body 112d is moved in the left-right direction as shown in FIG. When viewed from the above, the shape of the optical body 112d may be a rhombus shape. FIG. 19 is a cross-sectional view illustrating the optical body 112d of the display system according to the other modification. A pair of concave mirror surfaces 12b1 and a pair of flat mirror surfaces 12c1 may be formed on symmetrical surfaces of the four surfaces of the optical body 12. As a result, the rotation angle can be reduced when switching between the concave mirror surface 12b1 and the flat mirror surface 12c1. The optical body 112d may have one or more concave mirror surfaces 12b1 and one or more flat mirror surfaces 12c1 formed on three of the four surfaces. Further, the shape of the optical body 112d is not limited to the rhombus shape, and may be a polygonal shape such as a trapezoidal shape.

Further, each processing unit included in the display system according to the above-described first to third embodiments, the first to third modifications of the first and third embodiments and the second to fourth modifications of the first embodiment is typically an integrated circuit. It is realized as an LSI. These may be individually integrated into one chip, or may be integrated into one chip so as to include a part or all of them.

Further, the integrated circuit is not limited to the LSI, and may be realized by a dedicated circuit or a general-purpose processor. An FPGA (Field Programmable Gate Array) that can be programmed after the LSI is manufactured, or a reconfigurable processor that can reconfigure the connection and settings of circuit cells inside the LSI may be used.

In each of the above-described first to third embodiments, the first to third embodiments, and the first to second embodiments of the first embodiment, each component is composed of dedicated hardware or each configuration. It may be realized by executing a software program suitable for the element. Each component may be realized by a program execution unit such as a CPU or a processor reading and executing a software program recorded on a recording medium such as a hard disk or a semiconductor memory.

In addition, the numbers used above are all examples for the purpose of concretely explaining the present disclosure, and variations of the first to third embodiments of the present disclosure, the first to third embodiments, and the first embodiment of the present disclosure. Modifications 2 to 4 of the above are not limited to the illustrated numbers.

Further, the division of the functional block in the block diagram is an example, and a plurality of functional blocks can be realized as one functional block, one functional block can be divided into a plurality of functional blocks, and some functions can be transferred to other functional blocks. You may. Further, the functions of a plurality of functional blocks having similar functions may be processed by a single hardware or software in parallel or in a time division manner.

Further, the order in which each step in the flowchart is executed is for the purpose of exemplifying the present disclosure in detail, and may be an order other than the above. Further, a part of the above steps may be executed at the same time (parallel) as other steps.

In addition, a form obtained by applying various modifications that a person skilled in the art can think of with respect to the modified examples of the first to third embodiments, the first to third embodiments, and the modified examples 2 to 4 of the first embodiment, the purpose of the present disclosure. Also disclosed in the present disclosure are embodiments realized by arbitrarily combining the components and functions of the first and third embodiments, the modifications of the first to third embodiments and the modifications 2 to 4 of the first embodiment without departing from deviation. included.

The present disclosure can be used, for example, for vehicles and the like.

1, 1a, 1b, 1c, 1d Display system 11 First housing 12, 112a, 112b, 112c, 112d Optical body 12b, 212b Concave mirror 12b1, 212b1 Concave mirror surface 12c, 212c, 232c, 312c, 332c Plane mirror 12c1, 12c1, 212c1, 332c1 Flat mirror surface 12d Rotating axis 20 Display device (display unit)
225a Reflective surface 211, 231, 311 Second housing 312c1 Fresnel reflective surface 333 Posture adjustment unit H, H1, H2 Normal direction

Claims (15)

The display unit mounted on the moving body and
A concave mirror for displaying a virtual image of the display image indicated by the image light emitted by the display unit in the first mode, and
A plane mirror for reflecting a rear image incident on the moving body in the second mode is provided.
When the moving body is viewed from above, the display unit and the concave mirror are arranged so that a straight line connecting the center of the display unit and the center of the concave mirror has a predetermined angle with respect to the front-rear direction of the moving body. ,
A display system in which the normal direction at the center of the concave mirror surface of the concave mirror when the first mode is functioning and the normal direction of the flat mirror surface of the plane mirror when the second mode is functioning are non-parallel to each other. The predetermined angle is
When the moving body is viewed from above, it is based on the distance between the eyes of the occupant of the moving body who visually recognizes the concave mirror and the length of a straight line connecting the midpoint between the eyes and the center of the concave mirror. From the lower limit angle, which is the angle indicated by the straight line connecting the center of the concave mirror and the eye with respect to the straight line obtained.
An angle between a straight line in the left-right direction with respect to the traveling direction of the moving body passing through the center of the concave mirror and an upper limit angle which is an angle indicated by a straight line in the front-rear direction of the moving body passing through the center of the concave mirror. Item 1. The display system according to item 1. The display system according to claim 1 or 2, wherein the tangent line at the center of the display unit and the tangent line at the center of the concave mirror are parallel to each other. The display system according to any one of claims 1 to 3, wherein the display unit is arranged on the driver side of the moving body with respect to a straight line passing through the center of the concave mirror parallel to the front-rear direction of the moving body. .. The concave mirror and the plane mirror are housed in the first housing.
The display system according to any one of claims 1 to 4, wherein the first housing has a rotating shaft for internally rotating the concave mirror and the plane mirror. An optical body having the concave mirror and the plane mirror is provided.
The plane mirror is arranged on the opposite side of the concave mirror so that the plane mirror surface faces the outside.
The display system according to claim 5, wherein the optical body has a wedge shape when viewed from the vertical direction of the moving body. The distance between the plane mirror and the concave mirror at the end of the optical body on the side closer to the driver in the left-right direction with respect to the traveling direction of the moving body is the end far from the driver in the left-right direction with respect to the traveling direction of the moving body. The display system according to claim 6, wherein the distance between the plane mirror and the concave mirror in the unit is smaller than that of the concave mirror. The plane mirror is arranged so as to face the opposite side of the concave mirror.
The concave mirror and the plane mirror are
The normal direction at the center of the concave mirror surface is parallel to the normal direction of the flat mirror surface.
The display system according to claim 5, wherein the plane mirror surface of the plane mirror and the axial direction of the rotation axis are non-parallel. An optical body having the concave mirror and the plane mirror is provided.
The plane mirror is arranged so as to face the opposite side of the concave mirror.
The display system according to any one of claims 5 to 7, wherein the optical body is wedge-shaped when viewed from the left-right direction with respect to the traveling direction of the moving body. The plane mirror and the concave mirror
Housed in the second housing
The display system according to any one of claims 1 to 4, wherein the plane mirror is arranged between the concave mirror and the driver when viewed from the vertical direction of the moving body. The plane mirror
Fixed to the second housing
The display system according to claim 10, wherein the light transmittance is changed. The display system according to claim 11, wherein the normal direction of the flat mirror surface in the second mode is tilted by 10 ° or more from the optical axis direction of the light reflected by the concave mirror in the first mode. The display system according to claim 10, wherein the plane mirror is movable and is housed in the second housing in the first mode. The display system according to claim 10 or 13, wherein the plane mirror has a Fresnel reflecting surface. The display system according to any one of claims 1 to 14, wherein the plane mirror has a posture adjusting unit for adjusting a posture with respect to the concave mirror surface.

Images