JP6620706B2 - Head-up display device - Google Patents

Head-up display device Download PDF

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JP6620706B2
JP6620706B2 JP2016176938A JP2016176938A JP6620706B2 JP 6620706 B2 JP6620706 B2 JP 6620706B2 JP 2016176938 A JP2016176938 A JP 2016176938A JP 2016176938 A JP2016176938 A JP 2016176938A JP 6620706 B2 JP6620706 B2 JP 6620706B2
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optical
projection
light
movable
fixed
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JP2018041046A (en
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公宏 土岐
公宏 土岐
孝啓 南原
孝啓 南原
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株式会社デンソー
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Description

  The present invention relates to a projection member and a head-up display device (hereinafter abbreviated as a HUD device) mounted on a moving body.
  2. Description of the Related Art Conventionally, a projection member that is mounted on a moving body and onto which projection light is projected by a HUD device is known. The projection member disclosed in Patent Document 1 includes the first optical element in a state in which projection light linearly polarized in a direction that forms an angle of 45 degrees with respect to the horizontal direction of the image includes both the s-polarized component and the p-polarized component. The light is incident on the surface. The slow axis of the half-wave plate disposed between the first optical surface and the second optical surface is inclined with respect to the incident cross section. Thereby, the visibility of a virtual image is improved.
Japanese Patent Laying-Open No. 2015-225236
  Now, recent HUD devices are increasingly configured to project linearly polarized projection light along the horizontal direction of the moving body from the HUD device. Therefore, the present inventors examined a configuration in which projection light linearly polarized along the horizontal direction of the moving body is incident on the projection member employing the half-wave plate of Patent Document 1. However, in this studied configuration, it was found that when wearing polarized sunglasses, there was a concern that a burnishing point that would make it difficult or impossible to see the virtual image would cause a problem in the visibility of the virtual image. .
  The present invention has been made in view of the problems described above, and an object of the present invention is to provide a virtual image in polarized sunglasses in a HUD device that projects linearly polarized projection light along the horizontal direction of a moving body. An object of the present invention is to provide a projection member that enhances the visibility of the projector.
The inventions shown open, is mounted on a mobile object (1), toward the fixed stationary projection member to the mobile (250) to project the projection light, by reflecting the projection light to the fixed projection member , A head-up display device that displays a virtual image (VI) so as to be visible by an occupant,
A projection optical unit (10) for projecting linearly polarized projection light along the horizontal direction of the moving body;
Fixed projection in an attitude that is movably provided between the optical path space (So) outside the optical path of the projection light and the optical path space (Si) in the optical path of the projection light, and arranged between the optical path hollows. A movable projection member (260) on which projection light is projected instead of the member,
The movable projection member has a first optical surface (262a) that makes the projection light incident as s-polarized light and transmits at least a part of the projection light.
At least one of the movable projection member and the fixed projection member has a second optical surface (254) that reflects at least a part of the light transmitted through the first optical surface to the first optical surface side,
The movable projection member further includes a quarter-wave plate (266) in which the optical axis (266a) is inclined with respect to the horizontal direction of the moving body between the first optical surface and the second optical surface. .
  According to such an invention, in a posture in which the movable projection member is disposed in the space outside the optical path, the projection light projected by the projection optical unit enters the fixed projection member. In this case, the virtual light can be visually recognized by the occupant by reflecting the projection light to the fixed projection member.
  On the other hand, projection light is projected onto the movable projection member in place of the fixed projection member in a posture in which the movable projection member is disposed between the optical path hollows. Projection light from the projection optical unit linearly polarized along the horizontal direction of the moving body is incident on the first optical surface of the movable projection member as s-polarized light. Based on the Fresnel equation, a part of the light is transmitted through the first optical surface, and the other part is reflected by the first optical surface. Such other part can be imaged as a virtual image in a state of being linearly polarized along the horizontal direction of the moving body.
  Part of the first optical surface transmitted is converted from linearly polarized light to circularly polarized light or elliptically polarized light because the ¼ wavelength plate is disposed with the optical axis inclined with respect to the horizontal direction of the moving body. . The projection light converted into circularly polarized light or elliptically polarized light can be reflected by the second optical surface. Here, in the reflection at the second optical surface, the rotation direction of the polarized light is reverse to that before the reflection. That is, if it is clockwise polarized light before reflection, it is converted to counterclockwise polarized light, and if it is counterclockwise polarized light before reflection, it is converted to clockwise polarized light. The projection light reflected by the second optical surface and reversely polarized is incident on the quarter-wave plate again, but the direction of the optical axis of the quarter-wave plate remains the same. This time, it changes to a linearly polarized state along the vertical direction of the moving body. Such a part of the projection light can pass through the first optical surface and be imaged as a virtual image in a state of being linearly polarized along the vertical direction of the moving body.
  Therefore, the occupant of the moving body visually recognizes the virtual image by both the linearly polarized light along the horizontal direction of the moving body and the linearly polarized light along the vertical direction of the moving body. Therefore, even if the occupant wears polarized sunglasses, it is possible to avoid a situation where a burnishing point that makes it difficult or impossible to visually recognize a virtual image. Here, the movable projection member is provided so as to be movable between the space outside the optical path and the space in the optical path, so that different virtual image formation states can be realized depending on the above-described two postures. Therefore, for example, by moving the movable projection member in accordance with the occupant's wearing state of polarized sunglasses, the visibility of the virtual image can be increased according to the situation.
  In addition, the code | symbol in a parenthesis is not what was intended to limit the content of invention, only to illustrate the structure which respond | corresponds in embodiment mentioned later in order to make an understanding of description content easy.
It is a schematic diagram which shows the mounting state to the vehicle of the HUD apparatus in 1st Embodiment. It is a schematic diagram which shows the HUD apparatus and windshield in 1st Embodiment. It is a schematic diagram which shows the liquid crystal display part in 1st Embodiment. It is a front view of the liquid crystal panel in 1st Embodiment. It is a figure which expands and shows the V section of FIG. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. It is a figure which shows partially the cross section of the windshield in 1st Embodiment, Comprising: It is a figure for demonstrating the polarization state of the projection light in each location. It is a graph which shows the measurement result of the luminance distribution for every polarization angle in a comparative example. It is a graph which shows the measurement result of the luminance distribution for every polarization angle in a 1st embodiment. In the HUD device of a 2nd embodiment, it is a mimetic diagram showing the case where the movable combiner is the posture arranged in the space outside an optical path. In the HUD device of a 2nd embodiment, it is a mimetic diagram showing the case where the movable combiner is the posture arranged in the space outside an optical path. It is a figure which shows partially the cross section of the fixed combiner in 1st Embodiment, and a movable combiner, Comprising: It is a schematic diagram which shows the case where the movable combiner is the attitude | position arrange | positioned between optical path hollows.
  Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. In addition, the overlapping description may be abbreviate | omitted by attaching | subjecting the same code | symbol to the corresponding component in each embodiment. When only a part of the configuration is described in each embodiment, the configuration of the other embodiment described above can be applied to the other part of the configuration. In addition, not only combinations of configurations explicitly described in the description of each embodiment, but also the configurations of a plurality of embodiments can be partially combined even if they are not explicitly specified unless there is a problem with the combination. .
(First embodiment)
As shown in FIG. 1, the HUD device 100 according to the first embodiment of the present invention is mounted on a vehicle 1 that is a kind of moving body and is accommodated in an instrument panel 2. The HUD device 100 projects projection light onto a windshield 40 as a projection member of the vehicle 1 through a projection window 2 a provided on the upper surface portion of the instrument panel 2. The projected light is reflected by the windshield 40, so that the HUD device 100 displays the image in a virtual image so that the passenger can visually recognize the image. That is, the projection light reflected by the windshield 40 reaches the visual recognition area EB set in the room of the vehicle 1, and an occupant whose eye point EP is located in the visual recognition area EB perceives the projection light as a virtual image VI. And a crew member can recognize various information by virtual image VI. Examples of various information displayed as virtual images include vehicle status such as vehicle speed and fuel remaining amount, or navigation information such as road information and visibility assistance information.
  In the present embodiment, the horizontal direction of the vehicle 1 means a direction substantially parallel to the horizontal plane HP in the vehicle 1 on the horizontal plane HP. Similarly, the vertical direction of the vehicle 1 means a direction that is substantially perpendicular to the horizontal plane HP in the vehicle 1 on the horizontal plane HP.
  The visual recognition area EB is an area where the virtual image VI displayed by the HUD device 100 is clearly visible. Usually, the visual recognition area EB is provided so as to overlap with the eyelips set in the vehicle 1. The iris is set based on an eye range that statistically represents the distribution of the eye point EP of the driver as an occupant (see JIS D0021: 1998 for details).
  A specific configuration of such a HUD device 100 will be described below with reference to FIG. The HUD device 100 includes a projection optical unit 10 and a housing 30 that houses the projection optical unit 10.
  The projection optical unit 10 includes a liquid crystal display unit 12 and a light guide unit 20. The liquid crystal display unit 12 shown in FIG. 3 includes a light source 13, a condenser lens 14, a field lens 15, and a liquid crystal panel 16, and is formed by housing them in, for example, a box-shaped casing.
  The light source 13 is formed by, for example, an array of a plurality of light emitting elements 13a. The light emitting element 13a in the present embodiment is a white light emitting diode element that realizes pseudo white light emission by covering a blue light emitting diode with a phosphor, for example.
  The condenser lens 14 and the field lens 15 are disposed between the light source 13 and the liquid crystal panel 16. The condenser lens 14 is a lens array formed by convex lens elements formed in accordance with the number and arrangement of the light emitting elements 13a. The field lens 15 is a Fresnel lens formed in a flat plate shape. Both lenses 14 and 15 collect the light from the light source 13 and make it incident on the liquid crystal panel 16.
  The liquid crystal panel 16 of the present embodiment is a liquid crystal panel using thin film transistors (TFTs), and is an active matrix type liquid crystal panel formed from, for example, a plurality of liquid crystal pixels 17 arranged in two directions. .
  Specifically, as shown in FIG. 4, the liquid crystal panel 16 has a rectangular shape having a longitudinal direction and a lateral direction. As shown in FIG. 5, the liquid crystal pixels 17 are arranged in the longitudinal direction and the short direction, so that the display surface 16 b that emits an image as light on the light guide unit 20 side also has a rectangular shape. Each liquid crystal pixel 17 is provided with a transmissive portion 17a provided so as to penetrate in the normal direction of the display surface 16b and a wiring portion 17b formed so as to surround the transmissive portion 17a.
  As shown in FIG. 6, the liquid crystal panel 16 is formed by laminating a pair of polarizing plates 18a and 18b, a liquid crystal layer 18c sandwiched between the pair of polarizing plates 18a and 18b, and the like, thereby exhibiting a flat plate shape. ing. Each polarizing plate 18a, 18b has a transmission axis and an absorption axis orthogonal to the transmission axis. Each of the polarizing plates 18a and 18b has a property of transmitting light polarized in the direction of the transmission axis and absorbing light polarized in the direction of the absorption axis. The pair of polarizing plates 18a and 18b includes the transmission axis. Are arranged so that their directions are orthogonal to each other. The liquid crystal layer 18c can rotate the polarization direction of light transmitted through the liquid crystal layer 18c according to the applied voltage by applying a voltage for each liquid crystal pixel. By rotating the polarization direction, the ratio of light transmitted through the polarizing plate 18b on the light guide unit 20 side, that is, the transmittance can be changed as needed.
  Therefore, the liquid crystal panel 16 controls the transmittance of each liquid crystal pixel 17 with respect to the incidence of light on the illumination target surface 16a that is the surface on the light source 13 side. That is, the liquid crystal panel 16 can form an image and emit it as light. In this embodiment, the light emitted from the liquid crystal panel 16 is linearly polarized in the polarization direction along the longitudinal direction because the transmission axis on the light guide unit 20 side is along the longitudinal direction of the liquid crystal panel 16. It has become. The liquid crystal panel 16 of the present embodiment is arranged such that its longitudinal direction is along the horizontal direction of the vehicle 1.
  As shown in FIG. 5, adjacent liquid crystal pixels 17 are provided with color filters 18d of different colors (for example, red, green, and blue), and various colors can be realized by combining these color filters. It has become. The light emitted from the liquid crystal display unit 12 enters the light guide unit 20.
  As shown in FIG. 2, the light guide unit 20 guides the light emitted from the liquid crystal display unit 12 to the windshield 40 side. The light guide unit 20 includes a plane mirror 22 and a concave mirror 24. The light emitted from the liquid crystal display unit 12 enters the plane mirror 22 first.
  The plane mirror 22 is formed by evaporating aluminum as the reflecting surface 22a on the surface of a base material made of synthetic resin or glass. The reflection surface 22a is formed in a smooth flat shape. The light incident on the plane mirror 22 is reflected toward the concave mirror 24 by the reflecting surface 22a. The plane mirror 22 may be a cold mirror.
  The concave mirror 24 is formed by depositing aluminum as a reflective surface 24a on the surface of a base material made of synthetic resin or glass. The reflective surface 24a is formed in a smooth concave shape by being curved in a concave shape. The light incident on the concave mirror 24 is reflected by the reflecting surface 24a. The light reflected by the reflecting surface 24a is projected toward the windshield 40 as projection light through the projection window 2a. Here, the projection light projected onto the windshield 40 is linearly polarized along the horizontal direction of the vehicle 1.
  The windshield 40 used for forming the virtual image VI is disposed to be inclined with respect to the horizontal direction and the vertical direction of the vehicle 1. The windshield 40 is formed in a flat plate shape or a curved plate shape having translucency as a whole. As shown in FIG. 7, the windshield 40 of the present embodiment includes a first light transmitting plate 42, a second light transmitting plate 44, and a quarter wavelength plate 46, and these are laminated. . The thickness of the windshield 40 is substantially constant at each location.
  The first translucent plate 42 is formed in a translucent plate shape by glass, for example, and is disposed on the indoor side of the second translucent plate 44 and the quarter wavelength plate 46. The first light transmissive plate 42 has a first optical surface 42a facing the passenger as the indoor surface of the windshield 40. The first optical surface 42a is formed in a smooth planar shape or concave shape.
  The second translucent plate 44 is formed in a translucent plate shape by glass, for example, and is disposed on the outdoor side of the first translucent plate 42 and the quarter wavelength plate 46. The 2nd translucent board 44 has the 2nd optical surface 44a which faces the other side as a passenger | crew as a surface of the outdoor side in the windshield 40. As shown in FIG. The second optical surface 44a is substantially parallel to the first optical surface 42a and is formed in a smooth planar shape or convex shape.
  The quarter wavelength plate 46 is disposed between the first optical surface 42a and the second optical surface 44a. In particular, in the present embodiment, the first optical surface 42a is formed by the first light transmitting plate 42 and the second optical surface 44a is formed by the second light transmitting plate 44, respectively. It has a flat plate shape sandwiched between the first translucent plate 42 and the second translucent plate 44. The quarter-wave plate 46 is disposed with its optical axis 46 a (see FIG. 2) inclined with respect to the horizontal direction of the vehicle 1. Specifically, the optical axis 46a is disposed in a state where the optical axis 46a is inclined 45 degrees along the installation direction of the windshield 40 with respect to the horizontal direction of the vehicle 1. However, the optical axis 46a does not have to be strictly 45 degrees. The optical axis 46a of the quarter wavelength plate 46 referred to here indicates an axis having chromatic dispersion (so-called C axis) in the crystal composing the quarter wavelength plate 46.
  Projection light linearly polarized in the horizontal direction of the vehicle 1 from the projection optical unit 10 is incident on the first optical surface 42a of the windshield 40 as s-polarized light. Here, the incident angle of the projection light with respect to the first optical surface 42a is often 40 to 80 degrees depending on the positional relationship between the windshield 40 and the instrument panel 2, but is approximately 60 degrees in the present embodiment. ing. Here, the first optical surface 42a transmits at least a part of the projection light. The second optical surface 44a reflects at least a part of the light transmitted through the first optical surface 42a toward the first optical surface 42a. The projection light incident on the windshield 40 is reflected by the first optical surface 42a or the second optical surface 44a, thereby reaching the indoor viewing area EB. Thus, an optical path OP that is a path of projection light from the projection optical unit 10 to the visual recognition area EB through the windshield 40 is configured.
  Here, with respect to the luminance distribution for each polarization angle of the projection light reaching the visual recognition area EB, results of actual measurement by the inventors are shown in FIGS. FIG. 8 shows a case of a windshield not provided with the quarter wavelength plate 46. In FIG. 9, the case of the windshield 40 of this embodiment is shown. 8 and 9, 0 degrees or 180 degrees corresponds to the vertical direction of the vehicle 1, and 90 degrees or 270 degrees corresponds to the horizontal direction of the vehicle 1. 8 and 9, the polarizing plate is placed in the visual recognition area EB, the luminance of the projection light transmitted through the polarizing plate is measured while rotating the polarizing plate, and the measured value is fitted by a trigonometric function. Is plotted.
In the comparative example of FIG. 8, the luminance is approximately 0 cd / m 2 at 90 degrees or 270 degrees. That is, when the occupant wears polarized sunglasses, the polarization axis is arranged in the horizontal direction of the vehicle 1 in general polarized sunglasses, so the virtual image VI disappears from the occupant and the virtual image cannot be visually recognized. End up.
On the other hand, in the windshield 40 of this embodiment of FIG. 9, the luminance is 1500 cd / m 2 even at 90 degrees or 270 degrees. For this reason, even if the occupant is wearing polarized sunglasses, the virtual image VI never disappears.
(Function and effect)
The operational effects of the first embodiment described above will be described below.
  According to the first embodiment, the projection light projected by the HUD device 100 and linearly polarized along the horizontal direction of the vehicle 1 enters the first optical surface 42a of the windshield 40 as a projection member as s-polarized light. Based on the Fresnel equation, a part of the light is transmitted through the first optical surface 42a and the other part is reflected by the first optical surface 42a. Such other part can be imaged as a virtual image VI in a state of being linearly polarized along the horizontal direction of the vehicle 1.
  Part of the first optical surface 42a that has been transmitted is arranged in a state in which the ¼ wavelength plate 46 is inclined with respect to the horizontal direction of the vehicle 1 so that the optical axis 46a is inclined from the linearly polarized light to the circularly polarized light or the elliptically polarized light. Converted. The projection light converted into circularly polarized light or elliptically polarized light can be reflected by the second optical surface 44a. Here, in the reflection at the second optical surface 44a, the rotation direction of the polarized light is reverse to that before the reflection. That is, if it is clockwise polarized light before reflection, it is converted to counterclockwise polarized light, and if it is counterclockwise polarized light before reflection, it is converted to clockwise polarized light. The projection light reflected by the second optical surface 44a and reversely polarized is incident on the quarter-wave plate 46 again, but the direction of the optical axis 46a of the quarter-wave plate 46 remains unchanged. Therefore, this time, the state changes to a linearly polarized state along the vertical direction of the vehicle 1. Such a part of the projection light can pass through the first optical surface 42a and be imaged as a virtual image VI in a state of being linearly polarized along the vertical direction of the vehicle 1.
  Therefore, the passenger of the vehicle 1 visually recognizes the virtual image VI by both the linearly polarized light along the horizontal direction of the vehicle 1 and the linearly polarized light along the vertical direction of the vehicle 1. Therefore, even if the occupant wears polarized sunglasses, it is possible to avoid a situation where a burnishing point that makes it difficult or impossible to visually recognize the virtual image VI occurs. As described above, in the HUD device 100 that projects the linearly polarized projection light along the horizontal direction of the vehicle 1, the windshield 40 that improves the visibility of the virtual image VI in the polarized sunglasses can be provided.
  In FIG. 7, the polarization state at each location of the projection light is shown in a small graph. A point indicated by an arrow extending from the small graph is a position on the optical path OP corresponding to the small graph.
  Further, according to the first embodiment, the optical shaft 46 a is disposed with an inclination of 45 degrees with respect to the horizontal direction of the vehicle 1. For this reason, the conversion of the polarization state of the projection light by the quarter wavelength plate 46 can be ensured.
(Second Embodiment)
As shown in FIGS. 10-12, 2nd Embodiment of this invention is a modification of 1st Embodiment. The second embodiment will be described with a focus on differences from the first embodiment.
  The HUD device 200 includes a fixed combiner 250 and a movable combiner 260 in addition to the projection optical unit 10 and the housing 30 shown in FIGS.
  The fixed combiner 250 is arranged as a fixed projection member fixed to the vehicle 1 and the projection optical unit 10 and is inclined above the projection window 2a with respect to the horizontal and vertical directions of the vehicle 1. The fixed combiner 250 is made of a single translucent plate, and is formed in a translucent plate shape by, for example, a synthetic resin. In particular, the fixed combiner 250 of this embodiment is formed in a flat plate shape as shown in FIG.
  The fixed combiner 250 has a fixed optical surface 252 facing the occupant as a surface. The fixed optical surface 252 is formed in a smooth flat shape. When a movable combiner 260 described later is housed in the housing 30, the projection optical unit 10 projects the projection light linearly polarized along the horizontal direction of the vehicle 1 to the fixed optical surface 252 of the fixed combiner 250. Project toward. When the projection light is reflected by the fixed combiner 250, the HUD device 200 displays a virtual image so that the image can be visually recognized by the occupant of the vehicle 1.
  The movable combiner 260 is provided as a movable projection member that is movable with respect to the vehicle 1 and the projection optical unit 10. Specifically, as shown in FIGS. 10 and 11, the movable combiner 260 is movably provided between an optical path space So outside the optical path OP of the projection light and an optical path space Si in the optical path OP of the projection light. It has been. The movable combiner 260 is stored in the storage space 232 in the housing 30 in the posture arranged in the space outside the optical path So. The movable combiner 260 projects projection light instead of the fixed combiner 250 in a posture arranged in the optical path space Si. As shown in FIG. 12, the movable combiner 260 includes a first light transmitting plate 262, a second light transmitting plate 264, and a quarter wavelength plate 266, and these are laminated.
  The first translucent plate 262 is formed in a translucent plate shape using, for example, a synthetic resin, and is disposed closer to the passenger than the second translucent plate 264 and the quarter wavelength plate 266. Similar to the windshield 40 of the first embodiment, the first light transmissive plate 262 has a first optical surface 262a as a passenger-side surface, and the first optical surface 262a is formed in a smooth flat shape. ing.
  The second translucent plate 264 is formed in a translucent plate shape with, for example, synthetic resin, and is disposed on the opposite side of the occupant from the first translucent plate 262 and the quarter wavelength plate 266. Similarly to the windshield 40 of the first embodiment, the second light transmissive plate 264 has a surface 264a opposite to the occupant formed in a smooth flat surface.
  The quarter wave plate 266 is formed in the same manner as in the first embodiment. In other words, the optical axis 266a is arranged in a state of being inclined by 45 degrees along the extending direction of the movable combiner 260 with respect to the horizontal direction of the vehicle 1 (see FIGS. 10 and 11).
  In such a posture that the movable combiner 260 is disposed in the optical path space Si, the surface 264a opposite to the passenger is disposed in close contact with the fixed optical surface 252 of the fixed combiner 250 as shown in FIGS. ing. Here, the refractive index of the second light transmitting plate 264 is set to be equal to the refractive index of the fixed combiner 250. Therefore, less reflection occurs between the surface 264 a opposite to the passenger in the movable combiner 260 and the fixed optical surface 252 of the fixed combiner 250. In this way, the surface of the fixed combiner 250 opposite to the occupant functions as a second optical surface 254 similar to the second optical surface 44a of the first embodiment.
  When the projection optical unit 10 projects the linearly polarized projection light along the horizontal direction of the vehicle 1, in the case where the movable combiner 260 is disposed in the optical path space So, the fixed combiner 250 as shown in FIG. Is incident on the fixed optical surface 252 as s-polarized light. On the other hand, when the movable combiner 260 is positioned in the optical path space Si, the projection light is projected onto the movable combiner 260 instead of the fixed combiner 250 as shown in FIG. The light enters the optical surface 262a as s-polarized light. When the projection light is incident on the first optical surface 262a of the movable combiner 260, the same action as the windshield 40 of the first embodiment is obtained. Here, as described above, the second optical surface 254 of the fixed combiner 250 reflects at least a part of the light transmitted through the first optical surface 262a toward the first optical surface 262a.
  The occupant can switch the posture of the movable combiner 260 using, for example, a switch provided on the instrument panel 2 or the like. When the occupant is not wearing polarized sunglasses, the movable combiner 260 is switched so as to be placed in the optical path space So, and when the occupant is wearing polarized sunglasses, the movable combiner 260 is switched. Can be switched to the posture arranged in the optical path space Si.
  According to the second embodiment, in a posture in which the movable combiner 260 as the movable projection member is disposed in the optical path space So, the projection light projected by the projection optical unit 10 is directed to the fixed combiner 250 as the fixed projection member. Incident. In this case, the projection light is reflected by the fixed combiner 250, so that the virtual image VI can be visually recognized by the occupant.
  On the other hand, in a posture in which the movable combiner 260 is disposed in the optical path space Si, projection light is projected onto the movable combiner 260 instead of the fixed combiner 250. The projection light from the projection optical unit 10 linearly polarized along the horizontal direction of the vehicle 1 enters the first optical surface 262a of the movable combiner 260 as s-polarized light. Based on the Fresnel equation, a part of the light is transmitted through the first optical surface 262a and the other part is reflected by the first optical surface 262a. Such other part can be imaged as a virtual image VI in a state of being linearly polarized along the horizontal direction of the vehicle 1.
  Part of the first optical surface 262a that has been transmitted is arranged with the quarter-wave plate 266 tilted with respect to the horizontal direction of the vehicle 1 so that the optical axis 266a is inclined, so that linearly polarized light changes to circularly polarized light or elliptically polarized light. Converted. The projection light converted into circularly polarized light or elliptically polarized light can be reflected by the second optical surface 254. Here, in the reflection at the second optical surface 254, the rotation direction of the polarized light is reverse to that before the reflection. That is, if it is clockwise polarized light before reflection, it is converted to counterclockwise polarized light, and if it is counterclockwise polarized light before reflection, it is converted to clockwise polarized light. The projection light reflected by the second optical surface 254 and reversely polarized is incident on the quarter-wave plate 266 again, but the direction of the optical axis 266a of the quarter-wave plate 266 remains unchanged. Therefore, this time, the state is changed to a linearly polarized state along the vertical direction of the vehicle 1. Such a part of the projection light can pass through the first optical surface 262a and be imaged as a virtual image VI in a state of being linearly polarized along the vertical direction of the vehicle 1.
  Therefore, the passenger of the vehicle 1 visually recognizes the virtual image VI by both the linearly polarized light along the horizontal direction of the vehicle 1 and the linearly polarized light along the vertical direction of the vehicle 1. Therefore, even if the occupant wears polarized sunglasses, it is possible to avoid a situation where a burnishing point that makes it difficult or impossible to visually recognize the virtual image VI occurs. Here, the movable combiner 260 is provided so as to be movable between the optical path outer space So and the optical path inner space Si, and an imaging state of a different virtual image VI can be realized depending on the above-described two postures. Therefore, for example, by moving the movable combiner 260 according to the occupant's wearing state of polarized sunglasses, the visibility of the virtual image VI can be increased according to the situation.
  Further, according to the second embodiment, the movable combiner 260 is in close contact with the fixed optical surface 252 of the fixed combiner 250 in a posture in which the movable combiner 260 is disposed in the optical path space Si. According to such close contact, by bringing the reflection position at the fixed combiner 250 and the reflection position at the movable combiner 260 close to each other, the optical path OP of the projection light varies depending on whether the movable combiner 260 is outside the optical path or in the optical path. It becomes difficult. For this reason, even when the combiners 250 and 260 projected by the projection light are replaced with each other when the movable combiner 260 is moved, various aberrations are less likely to occur in the virtual image VI, and the reduction in visibility is suppressed.
(Other embodiments)
Although a plurality of embodiments of the present invention have been described above, the present invention is not construed as being limited to these embodiments, and various embodiments and combinations can be made without departing from the spirit of the present invention. Can be applied.
  Specifically, as a first modification, the windshield 40 of the first embodiment may not include at least one of the first light transmitting plate 42 and the second light transmitting plate 44. That is, the surface of the quarter wave plate 46 may be exposed, and the surface may correspond to the first optical surface 42a or the second optical surface 44a. The same applies to the movable combiner 260 of the second embodiment.
  As a second modification, in the windshield 40 of the first embodiment, the first optical surface 42a and the second optical surface 44a do not have to be parallel at the location where the projection light is projected. For example, the first optical surface 42a and the second optical surface 44a may be configured in a wedge shape such that the distance between the first optical surface 42a and the second optical surface 44a increases as the distance from the projection optical unit 10 increases. With such a wedge shape, the double image is suppressed from being visually recognized by the projection light reflected by the first optical surface 42a and the projection light reflected by the second optical surface 44a. The same applies to the fixed combiner 250 and the movable combiner 260 of the second embodiment.
  As a third modified example related to the second embodiment, the movable combiner 260 may be disposed with a gap from the fixed optical surface 252 of the fixed combiner 250 in a posture in which the movable combiner 260 is disposed in the optical path space Si. Good. In this case, the surface 264a opposite to the occupant of the movable combiner 260 functions as a second optical surface that reflects at least a part of the light transmitted through the first optical surface 262a toward the first optical surface 262a.
  As a fourth modification related to the second embodiment, the refractive index of the second light transmitting plate 264 may be set differently from the refractive index of the fixed combiner 250. In this case, both the surface 264a opposite to the occupant of the movable combiner 260 (also referred to as the fixed optical surface 252 in close contact with the surface 264a) and the surface 254 opposite to the occupant of the fixed combiner 250 are It functions as a second optical surface that reflects at least part of the light transmitted through the first optical surface 262a toward the first optical surface 262a.
  As a fifth modified example related to the second embodiment, the movable combiner 260 is positioned based on, for example, a camera for photographing the occupant's face on the instrument panel 2 and determining whether the occupant is wearing sunglasses based on the camera image. However, it may be switched according to the determination. That is, when the occupant is wearing sunglasses, the movable combiner 260 is placed in the optical path space Si. When the occupant is not wearing polarized sunglasses, the movable combiner 260 is in the optical path space So. It is possible to switch so that the posture is arranged in the.
  As a sixth modified example related to the second embodiment, the HUD device 100 may not include the fixed combiner 250 but may be configured to use the windshield of the vehicle 1 as a fixed projection member.
  As a modified example 7, the present invention may be applied to various moving bodies (transport equipment) such as ships or airplanes other than the vehicle 1.
  DESCRIPTION OF SYMBOLS 1 Vehicle (moving body), 10 Projection optical part, 40 Wind shield (projection member), 42a, 262a 1st optical surface, 44a, 254 2nd optical surface, 46,266 1/4 wavelength plate, 46a, 266a Optical axis , 100, 200 HUD device, 250 fixed combiner (fixed projection member), 252 fixed optical surface, 260 movable combiner (movable projection member), space in Si optical path, space outside optical path

Claims (3)

  1. Projected light is projected toward a fixed projection member (250) mounted on the movable body (1) and fixed to the movable body, and reflected by the occupant by reflecting the projected light on the fixed projection member. A head-up display device that displays a virtual image (VI) as possible,
    A projection optical unit (10) for projecting the projection light linearly polarized along the horizontal direction of the moving body;
    In an attitude that is movably provided between the optical path space (So) outside the optical path of the projection light and the optical path space (Si) in the optical path of the projection light, and disposed between the hollow optical paths. A movable projection member (260) on which the projection light is projected instead of the fixed projection member,
    The movable projection member has a first optical surface (262a) that makes the projection light incident as s-polarized light and transmits at least a part of the projection light,
    At least one of the movable projection member and the fixed projection member has a second optical surface (254) that reflects at least part of the light transmitted through the first optical surface toward the first optical surface,
    The movable projection member is a quarter-wave plate (266) in which an optical axis (266a) is inclined with respect to the horizontal direction of the movable body between the first optical surface and the second optical surface. A head-up display device.
  2. The fixed projection member includes a fixed optical surface (252) facing the occupant side,
    In said movable projection member is disposed in the optical path space orientation, the movable projection member is a head-up display device according to claim 1 which is in close contact with the fixed optical surface of the fixing projection member.
  3. Wherein the optical axis is a head-up display device according to claim 1 or 2 45-degree inclined are arranged with respect to the horizontal direction of the movable body.
JP2016176938A 2016-09-09 2016-09-09 Head-up display device Active JP6620706B2 (en)

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JP6620706B2 true JP6620706B2 (en) 2019-12-18

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