JP2010179918A - Display device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device for a vehicle not requiring to greatly change a sight direction in visually recognizing the foreground of a vehicle through a windshield or a combiner and in visually recognizing a virtual image of an image to be superimposed through the windshield or the combiner and facilitating focusing when the line of sight is moved in visually recognizing the foreground of the vehicle and in visually recognizing the virtual image of the image to be superimposed, even when a vertical position of an eye point is changed due to the driver's physique or a driving position. <P>SOLUTION: A translucent reflection mirror 55 is constructed movable in the vehicle longitudinal direction when an image light of the image for superposing displayed on a display surface 51a of a display source 51 is reflected by the translucent reflection mirror 55, the image for superposing is projected on a windshield 3, and virtual images S1 and S3 of the image for superposing are superposed with the foreground of the vehicle through the windshield 3 for visual recognition. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention projects an image for superimposition displayed on a display source in a dashboard of a vehicle onto a windshield and a combiner above the dashboard, so that the vehicle visually recognized through the windshield and the combiner. The present invention relates to a vehicular display device that superimposes a foreground and a virtual image of an image for superimposition.

   This type of vehicle display device, called a head-up display, makes it possible to superimpose the auxiliary information necessary for driving on the foreground of the vehicle, and recognizes auxiliary information etc. without performing a large line of sight movement during driving. have.

  And about such a display apparatus for vehicles, various proposals (for example, refer patent documents 1 thru / or patent documents 7) as what compensates for a difference of the up-and-down direction of an eyepoint by a driver's physique, a driving position, etc. Already known.

  And in each proposal of these patent documents 1 thru / or patent documents 4, the inclination angle of the reflective mirror which reflects the image light of the image for superimposition from a display source towards a windshield or a combiner is made adjustable, and a front is adjusted. The projection point of the superimposed image on the glass or combiner can be adjusted up and down.

  However, adjusting the tilt angle of the reflecting mirror changes the incident angle of the reflected light from the reflecting mirror to the windshield and combiner, and of course, the outgoing angle of the reflected light from the windshield and combiner also changes. To make it possible to continue to visually recognize the virtual image of the image for superimposition even if it changes to, the amount of vertical displacement of the projection point of the image for superimposition on the windshield or combiner is subtly relative to the amount of vertical displacement of the eyepoint. It needs to be different.

JP-A-5-229366 Japanese Patent Laid-Open No. 6-48218 Japanese Patent Laid-Open No. 6-144082 Japanese Patent Laid-Open No. 7-144557 Japanese Patent Laid-Open No. 7-257228 JP-A-6-115381 Japanese Patent Laid-Open No. 9-185012

  By the way, in general, the target point of the driver's line of sight is said to be about 10 to 20 meters ahead of the vehicle, although there are some differences depending on the traveling speed of the vehicle. Since the distance from the windshield or combiner to the target point on the road surface is overwhelmingly longer than the distance to the windshield or combiner, even if there is a difference in the vertical direction of the eyepoint, the inclination angle of the line of sight with respect to the road surface Will be almost unchanged.

  Therefore, it is desirable that the vertical displacement amount of the projection point of the superimposed image on the windshield or combiner when the eye point changes in the vertical direction is the same as the vertical displacement amount of the eye point.

  However, as described above, in each proposal of Patent Documents 1 to 4, the vertical displacement amount of the projection point of the image for superimposition on the windshield or combiner must be slightly different from the vertical displacement amount of the eye point. Therefore, if you try to compensate for the difference in the vertical direction of the eye point by adjusting the tilt angle of the reflecting mirror, even if it is not necessary for one eye point, It is necessary to move the line of sight between when the foreground is visually recognized and when the virtual image of the superimposed image is visually recognized. In this respect, each of the conventional proposals has room for further improvement.

  In addition, as another conventional proposal in this type of vehicle display device, as shown in Patent Document 5, according to the content of auxiliary information to be superimposed and visually recognized with the foreground of the vehicle and the direction of the line of sight at that time, One that adjusts the projection point of the image for superimposition on the windshield or combiner up and down, or one that compensates for the difference in perspective of the point of gazing due to the traveling speed of the vehicle, as typified by Patent Literature 6 and Patent Literature 7. There is.

  However, there has never been a proposal for ensuring the invariance of the line-of-sight direction with respect to the change in the vertical position of the eye point, as described above, or a proposal for recalling the necessity.

  The present invention has been made in view of the above circumstances, and the object of the present invention is to provide a vehicle foreground through a windshield and a combiner even if the vertical position of the eyepoint changes due to the physique of the driver or the driving position. It is not necessary to change the line-of-sight direction when visually recognizing and the line-of-sight direction when visually recognizing the virtual image of the image for superimposition through the windshield or combiner. An object of the present invention is to provide a vehicular display device capable of facilitating focusing when moving the line of sight when visually recognizing a virtual image.

  In order to achieve the above object, the vehicle display device according to the first aspect of the present invention is configured such that an image for superimposition displayed on a display source in a dashboard of the vehicle is arranged above the dashboard and is displayed on the vehicle. By projecting onto a projection member extending in an up-down direction with respect to the front-rear direction, the foreground of the vehicle visually recognized through the projection member and a virtual image of the superimposing image are superimposed and visually recognized. In the vehicle display device to be provided, the display source, the transflective mirror, and the second reflective mirror, which are sequentially disposed in the dashboard along the front-rear direction of the vehicle and spaced apart from each other, are provided. A part of the image light of the superimposing image emitted from the display source passes through the semi-transmissive reflector and is reflected by the second reflector, and then is projected by the semi-transmissive reflector. Reflected towards the member and front Transflective reflector was assumed to be configured to be disposed in a plurality of different positions in the longitudinal direction in the dashboard.

  According to a second aspect of the present invention, there is provided the display device for a vehicle according to the first aspect of the present invention. The display device for the vehicle according to the first aspect further includes a moving mechanism that supports the transflective mirror so as to be movable in the front-rear direction. Further, the transflective mirror is configured to be arranged at a plurality of different positions in the front-rear direction in the dashboard by the moving mechanism.

  Furthermore, the vehicle display device of the present invention described in claim 3 is the vehicle display device of the present invention described in claim 2, wherein the projection member is inclined with respect to the front-rear direction depending on the position in the front-rear direction. Are formed on different curved surfaces, and the moving mechanism is interlocked with a change in the tilt angle of the projection member located above the semi-transmissive reflector due to the movement of the semi-transmissive reflector in the front-rear direction. And the inclination angle adjustment mechanism part which changes the inclination-angle of the said semi-transmissive reflective mirror with respect to the said front-back direction shall be provided.

  A vehicle display device according to a fourth aspect of the present invention is the vehicle display device according to the first aspect of the present invention, wherein a plurality of the transflective mirrors are provided. Is further provided with a reflecting mirror advancing / retreating mechanism for selectively advancing and retracting with respect to the optical axis of the image light of the superimposing image, and advancing onto the optical axis of the image light of the superimposing image by the reflecting mirror advancing / retreating mechanism. By changing the semi-transmissive reflecting mirror to be changed, the reflecting mirror can be arranged at a plurality of different positions in the front-rear direction in the dashboard.

  Further, the vehicle display device of the present invention described in claim 5 is the vehicle display device of the present invention described in claim 4, wherein the projection member is inclined with respect to the front-rear direction depending on the position in the front-rear direction. Are formed on different curved surfaces, and each of the transflective mirrors is inclined with respect to the front-rear direction according to the inclination angle of each of the projection member positions located above the respective reflection mirrors among the projection members. It was assumed that each corner was set.

  Furthermore, the vehicle display device of the present invention described in claim 6 is arranged in the dashboard in the vehicle display device of the present invention described in any one of claims 1 to 5. The image enlarging optical element that enlarges the superimposing image and enters the translucent reflecting mirror is further provided.

  The vehicle display device of the present invention described in claim 7 is the vehicle display device of the present invention described in claim 6, wherein the image enlarging optical element is an optical axis of image light of the superimposing image. One surface in the direction was formed into a flat surface and opposed to the reflecting mirror, and the other surface was formed into a Fresnel surface.

  Furthermore, the vehicle display device of the present invention described in claim 8 is the vehicle display device of the present invention described in any one of claims 1 to 7, wherein the dashboard is provided on the upper surface of the dashboard. An opening window for emitting a part of image light reflected by the transflective mirror from the dashboard toward the projection member, and an opening window movement for moving the opening window in the front-rear direction And a mechanism.

  The vehicle display device of the present invention described in claim 9 is the vehicle display device of the present invention described in claim 8, further comprising a window opening / closing member that opens and closes the opening window.

  According to the vehicle display device of the present invention described in claim 1, when the position of the semi-transmissive reflector in the dashboard is changed in the front-rear direction, the superimposition from the display source reflected by the semi-transmissive reflector is performed. The direction of the image light of the image with respect to the projection member itself does not change, and only the projection location on the projection member moves in the vertical direction.

  Further, the image light of the superimposing image emitted from the display source reaches the second reflecting mirror by being semi-transmitted through the semi-transmissive reflecting mirror, and further reflected by the second reflecting mirror and then the semi-transmissive reflecting mirror. Since the light is projected onto the projection member by reflection by the transflective mirror, the focal point when viewing the virtual image of the superimposing image through the projection member is from the display source to the second reflecting mirror. In addition, it becomes a place far ahead of the projection member by an amount corresponding to the optical path length of the superimposing image passing through the transflective mirror to the projection member, and becomes much longer than the distance between the display source and the projection member. Become.

  According to the vehicle display device of the present invention described in claim 2, in the vehicle display device of the present invention described in claim 1, the position of the transflective mirror supported by the moving mechanism is set in the front-rear direction. By moving it, the position of the transflective mirror in the dashboard changes in the front-rear direction.

  Further, according to the vehicle display device of the present invention described in claim 3, in the vehicle display device of the present invention described in claim 2, when the transflective mirror is moved in the front-rear direction of the vehicle, the movement Since the tilt angle with respect to the front-rear direction of the transflective mirror is adjusted to an angle corresponding to the tilt angle with respect to the front-rear direction of the projection target member located above the transflective mirror at the subsequent front-rear position, the projection target Even when the member is a curved surface having a different inclination angle depending on the position in the front-rear direction, the superimposition image projected onto the projection member by the transflective mirror and reflected to the side where the virtual image of the superimposition image is viewed is reflected. The optical path is always at the same angle with respect to the front-rear direction or the vertical direction of the vehicle regardless of the position of the reflecting mirror in the front-rear direction of the vehicle.

  According to the vehicle display device of the present invention described in claim 4, in the vehicle display device of the present invention described in claim 1, on the optical axis of the image light of the image for superimposition by the reflecting mirror advance / retreat mechanism. By changing the transflective mirror to be advanced, the position of the transflective mirror in the dashboard changes in the front-rear direction.

  Further, according to the vehicle display device of the present invention described in claim 5, in the vehicle display device of the present invention described in claim 4, the semi-transmissive reflection is advanced on the optical axis of the image light of the image for superimposition. When the mirror is changed, the tilt angle of the transflective mirror with respect to the front-rear direction is adjusted to the angle corresponding to the tilt angle with respect to the front-rear direction of the projection member positioned above the transflective mirror at the front-rear position after the change. Therefore, even if the projection member is a curved surface having a different inclination angle depending on the position in the front-rear direction, the projection member is projected onto the projection member by the transflective mirror, and the virtual image of the image for superimposition is visually recognized. The optical path of the superimposed image to be reflected is always at the same angle with respect to the front-rear direction or the vertical direction of the vehicle, regardless of the position of the reflecting mirror in the front-rear direction of the vehicle.

  Furthermore, according to the vehicle display device of the present invention described in claim 6, in the vehicle display device of the present invention described in any one of claims 1 to 5, the projection target member is transparently superimposed. In order to lengthen the focal point when viewing the virtual image of the image for use, the size of the image for superimposition projected onto the projection member becomes relatively small from the perspective principle, and the superimposition from the display source to the projection member Even if a configuration in which the optical path of the image for the image is set longer by a reflecting mirror or a transflective mirror is used, the image for superimposition is enlarged by the image enlarging optical element on the way, so that the projected image is projected onto the projection member. A certain amount of size is ensured for the virtual image of the superimposing image that is viewed through the projection member.

  According to the vehicle display device of the present invention described in claim 7, in the vehicle display device of the present invention described in claim 6, the Fresnel lens is provided between the second reflecting mirror and the semi-transmissive reflecting mirror. When the second reflecting mirror is brought into close contact with one surface formed on the flat surface, the Fresnel lens is disposed so as not to hinder the movement of the transflective mirror in the front-rear direction. .

  Furthermore, according to the vehicle display device of the present invention described in claim 8, the vehicle display device of the present invention described in any one of claims 1 to 7 is reflected by the transflective mirror. By adjusting the front-rear direction position of the aperture window that emits the image light of the image for superimposing toward the projection member to the outside of the dashboard according to the front-rear direction position of the transflective mirror, the position of the transflective mirror is adjusted. An opening for emitting the image light of the image for superimposing toward the projection member to the outside of the dashboard is always secured with a minimum dimension at the upper surface portion of the corresponding dashboard.

  According to the vehicle display device of the present invention described in claim 9, in the vehicle display device of the present invention described in claim 8, the superimposed image that is reflected by the transflective mirror and travels toward the projection target member. An opening window for emitting the image light to the outside of the dashboard is ensured as necessary by opening the window opening and closing member.

  As described above, according to the vehicle display device of the present invention described in claim 1, even if the vertical position of the eyepoint changes due to the driver's physique, driving position, etc., the windshield and combiner are passed through. Move the line of sight between the foreground and the image for superimposition by making the line of sight when viewing the virtual image of the image for superimposition through the windshield or combiner substantially the same as the line of sight when viewing the foreground of the vehicle. Can be suppressed as much as possible.

  Further, the focal point when the virtual image of the superimposing image is viewed through the projection member is divided by the optical path length of the superimposing image from the display source to the projection member through the second reflecting mirror and the semi-transmissive reflecting mirror. Focusing is performed when moving the line of sight between the foreground and the superimposed image so that the distance between the display source and the projection member is much longer than the distance between the projection source and the projection member. Can be easily.

  According to the vehicle display device of the present invention described in claim 2, the position of the transflective mirror supported by the moving mechanism is moved in the front-rear direction, so that the front and rear of the transflective mirror in the dashboard The direction position can be easily changed.

  Furthermore, according to the display device for a vehicle of the present invention described in claim 4, by changing the transflective mirror that advances on the optical axis of the image light of the superimposing image by the reflecting mirror advance / retreat mechanism, It is possible to easily change the position of the transflective mirror in the front-rear direction.

  Therefore, according to the vehicle display device of the present invention described in claim 3 and claim 5, both of the cases where the projection target member is a curved surface having a different inclination angle depending on the position in the front-rear direction, Regardless of the position of the reflector in the front-rear direction of the vehicle, the optical path of the superimposition image projected onto the projection member by the transflective mirror and reflected to the side on which the virtual image of the superimposition image is viewed is Is always at the same angle with respect to the vertical direction, so that even if the vertical position of the eyepoint changes due to the driver's physique or driving position, the line of sight is surely moved between the foreground and the superimposed image. Can be suppressed.

  According to the vehicle display device of the present invention described in claim 6, the vehicle in which the focal point when visually recognizing the virtual image of the image for superimposition through the projection member is viewed through the projection member. Even if a configuration is adopted in which the optical path of the superimposing image from the display source to the projection member is set longer by the second reflecting mirror or the semi-transmissive reflecting mirror in order to make the foreground focal length longer. Visibility can be maintained by keeping the virtual image of the image for superimposition visually recognized through the member in a certain size.

  Furthermore, according to the vehicle display device of the present invention described in claim 7, the Fresnel lens is not hindered from moving in the front-rear direction of the transflective mirror between the second reflective mirror and the transflective mirror. Thus, the enlargement of the superimposing image and the suppression of the line-of-sight movement between the foreground and the superimposing image can both be achieved.

  Further, according to the vehicle display device of the present invention described in claim 8, the image light of the superimposing image directed to the projection target member is applied to the upper surface portion of the dashboard corresponding to the position of the transflective mirror. An opening to be emitted to the outside is always ensured with a minimum size, and the entry of the foreign object into the dashboard and the irradiation of the external light to the display source are suppressed, while the superimposed image is applied to the projection target member. Can be reliably projected.

  According to the vehicle display device of the present invention described in claim 9, when the superimposed image is not projected onto the projection target member, the opening window is closed by the window opening / closing member, and the dashboard of foreign matter is obtained. It is possible to further suppress the entry into the inside and the irradiation of the display source of external light.

1 is a cross-sectional view showing a basic schematic configuration of a vehicle display device according to an embodiment of the present invention. FIG. 2 is an enlarged explanatory diagram of the magnifying reflector shown in FIG. 1. It is an expansion perspective view of the moving mechanism of the transflective mirror shown in FIG. It is the perspective view of the upper surface seen from the back side (inner side) of the dashboard shown in FIG. It is an expansion perspective view which shows the modification of the cover unit of FIG. It is principal part sectional drawing which shows the modification of the cover unit of FIG. It is a perspective view which shows typically the modification of the cover unit of FIG. It is sectional drawing which shows the principle schematic structure of the display apparatus for vehicles which concerns on the deformation | transformation embodiment of this invention. FIG. 9 is a schematic diagram of a tilt angle adjustment type moving mechanism of the transflective mirror shown in FIG. 8.

  Embodiments of a display device for a vehicle according to the present invention will be described below with reference to the drawings.

  FIG. 1 is a cross-sectional view showing a basic schematic configuration of a vehicular display device according to an embodiment of the present invention. The vehicular display device indicated by reference numeral 5 in FIG. 1 is superimposed on a windshield 3 (corresponding to a projection member) that is positioned above 1a and has a substantially uniform inclination with respect to the front-rear or vertical direction of the vehicle. The image for projecting is projected and accommodated in the dashboard 1 of the vehicle.

  The vehicle display device 5 includes a display source 51, a magnifying reflecting mirror 53, a semi-transmissive reflecting mirror 55, a moving mechanism 57 (see FIG. 3), a cover unit 59, and the like.

  Among these, the display source 51 includes a fluorescent display tube, an EL (electroluminescence), a liquid crystal display with a backlight, and the like. On the display surface 51a arranged toward the rear of the vehicle, the traveling direction information of the navigation device. An image for superimposition (not shown) such as auxiliary information necessary for driving such as driving speed and travel speed is displayed.

  Further, as shown in the enlarged explanatory diagram of FIG. 2, the magnifying reflecting mirror 53 includes a flat surface 53b of a Fresnel lens 53a (corresponding to an image enlarging optical element) and a reflecting mirror 53d (corresponding to a second reflecting mirror). The Fresnel surface 53c formed on the opposite side of the flat surface 53b of the Fresnel lens 53a is directly connected to the display surface 51a of the display source 51 as shown in FIG. In contrast, the display source 51 is arranged behind the vehicle at an interval.

  The transflective mirror 55 is held by the moving mechanism 57 and is disposed on the optical axis L of the image light of a superimposing image (not shown) heading from the display source 51 toward the magnifying reflector 53.

  Specifically, as shown in an enlarged perspective view in FIG. 3, the moving mechanism 57 includes two guide shafts 57a and 57a that extend in the longitudinal direction of the vehicle and are arranged in parallel, and the guide shafts 57a and 57a. Therefore, the slider 57b is slidably supported in the front-rear direction of the vehicle, and the holder 57c is formed on the slider 57b.

  Then, by attaching the transflective mirror 55 to the holder 57c, as shown in FIG. 1, the upper end is adjusted so that the inclination angle with respect to the optical axis L of the image light of the superimposing image (not shown) becomes a predetermined angle. In the state inclined to the display source 51 side, it moves on the optical axis L of the image light between the display source 51 and the magnifying reflector 53 in the direction along the optical axis L, that is, in the front-rear direction of the vehicle. A transflective mirror 55 is arranged in a possible state.

  As shown in FIG. 3, the moving mechanism 57 further includes a pinion 57d provided on the dashboard 1 side, and a rack 57e that meshes with the pinion 57d and is fixed to the slider 57b. By rotating the pinion 57d electrically (by operation of a motor or the like) or manually (by operation of an operation knob or the like), the slider 57b together with the transflective mirror 55 has the positions of eye points I1 and I3 shown in FIG. The vehicle is configured to move in the front-rear direction of the vehicle within a range corresponding to the change width in the vertical direction.

  The cover unit 59 includes a cover main body 59a that covers an opening 1b formed in the upper surface 1a of the dashboard 1, and an opening window 59b formed in the cover main body 59a.

  In the present embodiment, the opening 1b of the upper surface 1a of the dashboard 1 is formed with a width in the front-rear direction corresponding to the movement range of the slider 57b in the front-rear direction of the vehicle described above. The cover main body 59a is supported by the cover support mechanism 59c so as to be movable in the front-rear direction of the vehicle so that the movement range is limited to a range in which the opening window 59b is located.

  That is, as shown in the perspective view of the upper surface 1a of the dashboard 1 as viewed from the back side (inside) in FIG. 4, the cover support mechanism 59c (corresponding to the opening window moving mechanism) is provided on the back surface of the upper surface 1a of the dashboard 1. The left and right guide rails 59d and 59d are attached to the left and right sides of the cover main body 59a only in the front-rear direction. Supported as possible.

  Stopper pieces 59e, 59e are bent at both front and rear ends of each guide rail 59d, and the movement of the cover main body 59a in the front-rear direction by the stopper pieces 59e is from the opening 1b of the dashboard 1 to the opening window 59b. Is restricted to a range that does not protrude forward and backward.

  Next, the operation of the vehicle display device 5 of the present embodiment configured as described above will be described.

  First, it is assumed that the front-rear direction position of the cover main body 59a of the cover unit 59 has already been adjusted so that the position of the opening window 59b matches the position of the transflective mirror 55 indicated by the solid line in FIG. 1 in the front-rear direction of the vehicle. When a superimposing image (not shown) such as auxiliary information necessary for driving is displayed on the display source 51 and the image light is emitted from the display surface 51a of the display source 51, the image light faces the display surface 51a. It reaches the transflective mirror 55 arranged between the magnifying reflector 53 and the magnifying reflector 53.

  Here, since the transflective mirror 55 is disposed with its upper end inclined toward the display source 51 so that the inclination angle of the image light of the superimposing image with respect to the optical axis L is a predetermined angle, it is transflective. Part of the image light of the superimposing image that reaches the mirror 55 is reflected downward of the dashboard 1, and the other part of the image light passes through the semi-transmissive reflecting mirror 55 and reaches the magnifying reflecting mirror 53.

  Then, the image light of the superimposing image that has reached the magnifying reflector 53 is transmitted through the Fresnel lens 53a from the Fresnel surface 53c of the Fresnel lens 53a located on the display source 51 side of the magnifying reflector 53 toward the flat surface 53b. The reflected image light of the superimposed image reaches the reflecting surface 53e of the reflecting mirror 53d that is in close contact with the flat surface 53b, and the reflected image light of the superimposed image is transmitted again through the Fresnel lens 53a from the flat surface 53b toward the Fresnel surface 53c. Then, the light is emitted from the magnifying reflecting mirror 53 toward the display source 51.

  As described above, when the image light of the superimposing image is reciprocally transmitted through the Fresnel lens 53a, the superimposing image is substantially enlarged by the convergence effect of the image light, and the image light of the superposed image in the enlarged state is transmitted. On the way to the display source 51, the transflective mirror 55 is reached again.

  Then, a part of the image light of the superimposing image that has reached the transflective mirror 55 is transmitted through the transflective mirror 55, and the other part is reflected upward of the dashboard 1, and the cover main body 59a It passes through the opening window 59b and reaches the windshield 3, thereby projecting a superimposing image.

  Then, through the windshield 3 from the eye point I1 directly behind the projection point P1 of the superimposing image on the windshield 3, it is generally about 10 to 20 m ahead of the vehicle, which is generally said to be the target point of the driver's line of sight. The virtual image S1 of the image for superimposition projected on the projection point P1 of the windshield 3 is visually recognized at the imaging point on the line of sight L1 when the previous foreground is visually recognized.

  Further, the transflective mirror 55 is moved from the position indicated by the solid line in FIG. 1 to the position indicated by the imaginary line, that is, rearward, and the cover main body 59a of the cover unit 59 is moved rearward so that the position of the opening window 59b is aligned with this. When the superimposition image is displayed on the display surface 51a of the display source 51, the image light of the superimposition image is transmitted through the transflective mirror 55 and reciprocally transmitted through the Fresnel lens 53a, and then transmitted to the display source 51. A part of the image light of the superimposing image that has been substantially enlarged is reflected toward the upper side of the dashboard 1 by the semi-transmissive reflecting mirror 55 and reaches the semi-transmissive reflecting mirror 55 on the way to the cover body. The light is projected onto the windshield 3 through the opening window 59b of 59a.

  Then, since the transflective mirror 55 is moved backward, the projection point P3 of the image for superimposition on the windshield 3 is located at the position indicated by the solid line in FIG. Therefore, it moves about 10-20 m ahead of the vehicle through the windshield 3 from the eye point I3 directly behind the projection point P3 located above the eye point I1. The virtual image S3 of the image for superimposition projected on the projection point P3 of the windshield 3 is visually recognized at the imaging point on the line of sight L3 when the foreground is visually recognized.

  Therefore, when the eye point moves upward, the transflective mirror 55 is moved backward, and when the eye point moves downward, the transflective mirror 55 is moved forward, so that the vehicle can be moved from each eye point to the vehicle. The virtual image of the image for superimposition is visually recognized at the imaging point on the line of sight when the foreground approximately 10 to 20 m ahead is visually recognized.

  In FIG. 1, the virtual image S1 and the virtual image S3 are slightly shifted in the front-rear direction for ease of viewing, but the positions of the virtual image S1 and the virtual image S3 are actually the same.

  As described above, according to the vehicle display device 5 of the present embodiment, the image light of the superimposing image displayed on the display surface 51 a of the display source 51 is reflected by the semi-transmissive reflecting mirror 55 and is superimposed on the windshield 3. The semi-transparent reflecting mirror 55 is configured to be movable in the front-rear direction of the vehicle when the virtual images S1 and S3 of the image for superimposition are superimposed on the foreground of the vehicle through the windshield 3 and viewed.

  Therefore, even if the vertical positions of the eye points I1, I3 change depending on the driver's physique, driving position, etc., the front of the vehicle looks in the direction of the lines of sight L1, L3 when viewing the foreground of the vehicle through the windshield 3. The line-of-sight direction when visually recognizing the virtual images S1 and S3 of the image for superimposition through the glass 3 can be made to substantially coincide with each other so that the line-of-sight movement between the foreground and the image for superimposition can be suppressed as much as possible.

  The opening window 59b of the cover main body 59a may be always open as in the present embodiment, or an opening / closing lid (not shown, corresponding to a window opening / closing member) is provided to superimpose the superimposed image. The opening window 59b may be configured to be closed by an opening / closing lid when not performed, and if configured in such a manner, entry of dust or foreign matter into the dashboard 1 from the outside can be prevented, or If the opening / closing lid (not shown) is made of a light-shielding member, it is advantageous that light from the outside of the vehicle is not incident on the display source 51 when not in use to cause a failure due to heat.

  Further, instead of providing an opening / closing lid on the opening window 59b, as shown in an enlarged perspective view in FIG. 5, a light shielding wall 59f is erected on the cover body 59a around the opening window 59b, and the inner side of the light shielding wall 59f is transparent. A configuration may be adopted in which a light curved cover 59g is fitted and light from the outside of the vehicle irradiated to the curved cover 59g is reflected on the light shielding wall 59f and prevented from being inserted into the dashboard 1. 6, a translucent cover 59h that has been subjected to anti-reflection (AR) treatment on the surface may be fitted in place of the curved surface cover 59g.

  Further, when the movement range of the cover main body 59a does not fit on the upper surface 1a of the dashboard 1, as shown in a schematic perspective view of FIG. 7, a large number of belt-like plates 59j are connected at an arbitrary position. It is desirable to be able to bend.

  Incidentally, in the present embodiment, the windshield 3 has a substantially uniform inclination with respect to the front-rear or vertical direction of the vehicle, but actually, as shown in the schematic diagram of FIG. In some cases, the inclination may differ depending on the position. In this case, as shown in the schematic diagram of FIG. 9, an inclination angle adjustment type moving mechanism 58 (corresponding to an inclination angle adjustment mechanism unit) may be employed.

  The tilt angle adjusting type moving mechanism 58 includes holders 58a and 58a that are respectively fitted to the left and right side edges of the transflective mirror 55, and guide pins that project from the vertical center of each holder 58a and near the lower end. 58b, 58c, the horizontal guide hole 58d into which the guide pin 58b at the center in the vertical direction is inserted, and the distance between the guide holes 58d is shorter than the distance between the guide pins 58b, 58c, and as the vehicle heads forward. The guide hole 58e extends so as to have a small gap with the guide hole 58d, and the guide pin 58c near the lower end is inserted.

  Further, the tilt angle adjusting type moving mechanism 58 is a power source (not shown) that moves the guide pin 58b back and forth with respect to the guide hole 58d by electric (by operation of a motor or the like) or manually (by operation of an operation knob or the like). ).

  According to the tilt angle adjusting type moving mechanism 58, when the guide pin 58b is moved back and forth with respect to the guide hole 58d by a power source (not shown), the guide hole 58d and the guide hole 58e at the position where the guide pin 58b is located. The position of the guide pin 58c in the guide hole 58e is shifted in the front-rear direction of the vehicle relative to the position of the guide pin 58b in the guide hole 58d. The upper end of the transmissive reflecting mirror 55 is inclined toward the front side of the vehicle.

  Therefore, even if the windshield 3 is formed in a curved shape as shown in FIG. 8, the windshield 3 is seen through according to the change in the vertical position of the eye points I1, I3 due to the physique of the driver and the driving position. The direction of the line of sight when the virtual image of the superimposed image is viewed through the windshield 3 is always substantially aligned with the direction of the line of sight L1 and L3 when viewing the foreground of the vehicle. The line-of-sight movement between them can be suppressed as much as possible.

  In the present embodiment, the case where the transflective mirror 55 is movable in the front-rear direction of the vehicle by the moving mechanism 57 has been described as an example. However, the transflective mirror 55 is spaced in the front-rear direction of the vehicle. A plurality of them, and a single transflective mirror 55 is selectively advanced on the optical path of the superimposing image between the display source 51 and the magnifying reflective mirror 53, and another transflective mirror 55 is prepared. Each semi-transmissive reflecting mirror 55 may be provided with a reflecting mirror advance / retreat mechanism (not shown) so that it can be retracted from the optical path.

  Further, when the windshield 3 is formed in a curved shape as shown in FIG. 8, the respective transflective mirrors 55 are set at different inclination angles according to their arrangement in the front-rear direction of the vehicle. May be.

  Note that enlargement of the superimposing image by the Fresnel lens 53 a of the magnifying reflector 53 may be omitted if not necessary for design. In that case, the mere reflecting mirror may be replaced with the magnifying reflector 53. However, if the focal points of the virtual images S1 and S3 of the superimposing image should be separated as far as possible from the windshield 3 so that the foreground and the focal point coincide with each other, the optical path of the superimposing image from the display source 51 to the windshield 3 is changed. Since it is necessary to make the superposition image relatively small by increasing the length, it is advantageous to provide a configuration in which the superposition image is enlarged by the Fresnel lens 53a.

  The enlargement of the superimposing image is not limited to the Fresnel lens 53a described in the present embodiment, and may be a curved mirror such as a spherical mirror or an aspherical mirror. In this case, the reflecting function of the reflecting mirror 53d is used. Since it can be covered by the curved mirror, the magnifying reflecting mirror can be substantially constituted by the curved mirror alone.

  Furthermore, the image for superimposition may be enlarged using a normal convex lens instead of the Fresnel lens 53a. In this case, if one side of the convex lens is a flat surface, it is brought into close contact with the reflecting mirror 53d by vapor deposition. On the other hand, if both surfaces of the convex lens are curved surfaces, they are structurally separated from the reflecting mirror 53d to form a magnifying reflecting mirror.

  The tilt angle of the transflective mirror 55 described as the predetermined angle in the present embodiment is actually the tilt angle at the projection points P1 and P3 of the windshield 3, the windshield in the vehicle front-rear direction and the vertical direction. 3 is determined by comprehensively considering the positional relationship between the three projection points P1 and P3 and the transflective mirror 55, the directions of the lines of sight L1 and L3 of the driver from the eye points I1 and I3, and the like.

  Further, in the present embodiment, the case where the projection member is the windshield 3 has been described as an example. However, the present invention uses a combiner disposed in front of the windshield 3 as a projection member and superimposes it on this. Needless to say, the present invention can also be applied to a vehicular display device that projects an image for use.

1 Dashboard 3 Windshield (projected member)
DESCRIPTION OF SYMBOLS 5 Display apparatus for vehicles 51 Display source 53a Fresnel lens (optical element for image expansion)
53b Flat surface 53c Fresnel surface 53d Reflector (second reflector)
55 Transflective Mirror 57 Movement Mechanism 58 Inclination Angle Adjustable Movement Mechanism (Inclination Angle Adjustment Mechanism Section)
59b Open window 59c Cover support mechanism (open window moving mechanism)
L Optical axis

Claims (9)

An image for superimposition displayed on a display source in a dashboard of a vehicle is projected on a projection member that is disposed above the dashboard and extends in a vertical direction with respect to the front-rear direction of the vehicle. Thus, in the vehicle display device that causes the foreground of the vehicle to be visually recognized through the projection target member and the virtual image of the superimposing image to be visually confirmed,
The display source, the transflective mirror, and the second reflective mirror, which are sequentially disposed in the dashboard along the front-rear direction of the vehicle and spaced apart from each other,
A part of the image light of the superimposing image emitted from the display source passes through the semi-transmissive reflecting mirror and is reflected by the second reflecting mirror, and then is projected by the semi-transmissive reflecting mirror. Is reflected toward the
The transflective mirror is configured to be arranged at a plurality of different positions in the front-rear direction in the dashboard.
A display device for a vehicle.   The moving mechanism further supports the transflective mirror so as to be movable in the front-rear direction, and the transflective mirror can be arranged at a plurality of different positions in the front-rear direction in the dashboard by the moving mechanism. The vehicle display device according to claim 1, which is configured as follows.   The projection target member is formed into a curved surface having a different inclination angle with respect to the front-rear direction depending on the position in the front-rear direction, and the moving mechanism is configured to transmit the semi-transmissive reflection by the movement of the transflective mirror in the front-rear direction. The inclination angle adjustment mechanism part which changes the inclination-angle of the said semi-transmissive reflective mirror with respect to the said front-back direction in response to the change of the said inclination-angle of the said to-be-projected member located above a mirror is provided. Vehicle display device.   A plurality of the transflective mirrors are provided, further comprising a reflecting mirror advancing / retreating mechanism for selectively advancing and retracting each transflective mirror with respect to the optical axis of the image light of the superimposing image, By changing the transflective mirror that is advanced on the optical axis of the image light of the superimposing image by a reflective mirror advance / retreat mechanism, the transflective mirrors are located at a plurality of different positions in the front-rear direction in the dashboard. The vehicular display device according to claim 1, wherein the vehicular display device is arranged.   The projection member is formed into a curved surface having an inclination angle with respect to the front-rear direction depending on the position in the front-rear direction, and the transflective mirrors are respectively positioned above the reflectors in the projection member. The vehicle display device according to claim 4, wherein an inclination angle with respect to the front-rear direction is set in accordance with the inclination angle of the projection member portion to be projected.   The vehicle according to any one of claims 1 to 5, further comprising an image enlarging optical element that is disposed in the dashboard and that enlarges the superimposing image to enter the transflective mirror. Display device.   The image enlarging optical element has one surface in the optical axis direction of the image light of the superimposing image formed as a flat surface facing the second reflecting mirror and the other surface formed as a Fresnel surface. The vehicle display device according to claim 6, wherein the display device is a lens.   On the upper surface of the dashboard, an opening window for emitting a part of the image light reflected by the transflective mirror toward the projection member from the dashboard, and the opening window through the front and rear The vehicle display device according to any one of claims 1 to 7, further comprising an opening window moving mechanism for moving in a direction.   The vehicle display device according to claim 8, further comprising a window opening / closing member that opens and closes the opening window.

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