Image Projection Device

Abstract

To provide an image projection device with which, while saving space using a common image irradiation unit and a free-form surface mirror, yet it is possible to differentiate the image forming positions of a plurality of virtual images.SOLUTION: Provided is an image projection device (10) that irradiates a display unit (6) for displaying a virtual image with a projection image, and that comprises an image irradiation unit (1) that radiates first image light (L1) and second image light (L2), and an irradiation optical system that radiates the first image light (L1) and the second image light (L2) in a viewpoint direction via the display unit (6). The irradiation optical unit includes an image-forming position adjustment unit (4) that causes a difference in image-forming position of the virtual image between the first image light (L1) and the second image light (L2).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an image projection device, and more particularly to an image projection device that projects a projection image onto a display unit for displaying a virtual image. [Background technology]

[0002] Conventionally, dashboards that illuminate icons have been used to display various types of information inside vehicles. As the amount of information to be displayed increases, it has been proposed to embed an image display device in the dashboard or to configure the entire dashboard with an image display device.

[0003] However, since the instrument panel is located below the vehicle's windshield, the driver must move their eyes downward while driving in order to see the information displayed on the instrument panel, which is undesirable. Therefore, a head-up display (hereinafter referred to as HUD) has been proposed, which projects an image onto the windshield so that the driver can read information when looking ahead of the vehicle (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-119248 [Patent Document 2] Japanese Patent Application Publication No. 2019-119262 Summary of the Invention [Problem to be solved by the invention]

[0005] In addition, in order to present more information, it has been proposed to project multiple images onto the windshield using a driving assistance HUD device. However, in order to project and form multiple images as virtual images at different distances, it is necessary to provide multiple combinations of image projection units and free-form mirrors, which poses a problem of limited design freedom when accommodating them within the instrument panel. Therefore, it has been proposed to display two projected images within the display range of a single image projection unit and reflect them with a common free-form mirror, thereby reducing the number of parts and saving space.

[0006] However, because the two image lights emitted from the common image projection unit are reflected by a common free-form mirror and formed at the same focal point, the imaging distance of the virtual images from the passenger's viewpoint becomes roughly the same. When virtual images are projected at the same imaging distance, the virtual image superimposed on the background outside the vehicle and the windshield creates an unnatural sense of depth.

[0007] Therefore, the present invention has been made in consideration of the above-mentioned conventional problems, and aims to provide an image projection device that can save space by using a common image irradiation unit and free-form surface mirror, while being able to vary the imaging positions of multiple virtual images. [Means for solving the problem]

[0008] In order to solve the above-described problems, an image projection device of the present invention is an image projection device that projects a projection image onto a display unit for displaying a virtual image, and includes an image projection unit that projects first image light and second image light, and an projection optical unit that projects the first image light and the second image light in a viewing direction via the display unit, and the projection optical unit includes an image formation position adjustment unit that generates a difference in the image formation position of the virtual image between the first image light and the second image light. The imaging position adjustment unit is a reflecting prism, and the reflecting prism includes a first incident portion, a second incident portion, a reflecting portion, a first exit portion, and a second exit portion, the first image light is incident from the first incident portion, is reflected by the reflecting portion, and is exited from the first exit portion, the second incident portion and the second exit portion are arranged opposite to each other, and the second image light is incident from the second incident portion, is not reflected by the reflecting portion, passes through the interior, and is exited from the second exit portion. It is characterized by:

[0009] In the image projection device of the present invention, the imaging position adjustment unit creates a difference in the imaging positions of the first image light and the second image light, making it possible to differ the imaging positions of multiple virtual images while saving space by using a common image irradiation unit and free-form mirror.

[0012] In one aspect of the present invention, the image irradiation unit has a first region that irradiates the first image light and a second region that irradiates the second image light, and the reflecting prism is arranged so that the first incident portion faces the first region and the second incident portion faces the second region.

[0013] In one aspect of the present invention, the first entrance portion of the reflecting prism is a lens with optical power It is considered to be the shape .

[0014] In one aspect of the present invention, the image irradiating unit includes a first region that irradiates the first image light and a second region that irradiates the second image light, and the lens The first incident portion is shaped is disposed opposite the first region.

[0015] In one aspect of the invention, the imaging position of the virtual image of the first image light is farther from the viewpoint position than the imaging position of the second image light. [Effects of the Invention]

[0016] The present invention can provide an image projection device that can vary the image formation positions of a plurality of virtual images while saving space by using a common image irradiation unit and free-form surface mirror. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a schematic diagram showing the configuration of an image projection device 10 according to a first embodiment and the position of a formed virtual image. [Figure 2] 1 is a schematic diagram showing a display area of ​​an image projected from an image projection unit 1 in an image projection device 10 according to a first embodiment. [Figure 3] FIG. 2 is a schematic diagram showing the structure of a reflecting prism 4 in the first embodiment. [Figure 4] FIG. 10 is a schematic diagram showing a modified example of the reflecting prism 4 in the second embodiment. [Figure 5] FIG. 10 is a schematic diagram showing the configuration of an image projection device 20 according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0018] (First embodiment) Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. The same or equivalent components, members, and processes shown in each drawing will be assigned the same reference numerals, and redundant explanations will be omitted where appropriate. Figure 1 is a schematic diagram showing the configuration of an image projection device 10 according to this embodiment and the position of a virtual image formed.

[0019] As shown in Fig. 1, image projection device 10 includes image projection unit 1, free-form surface mirrors 2 and 3, reflecting prism 4, and external light blocking unit 5. Here, the combination of free-form surface mirror 2, free-form surface mirror 3, and reflecting prism 4 constitutes the projection optical unit of the present invention. Light projected from image projection device 10 is irradiated onto the driver's viewpoint via windshield 6 (display unit), and virtual images 7 and 8 are formed at a predetermined distance from windshield 6.

[0020] The image projection device 10 also includes a control unit (not shown) that is connected to each unit so as to be able to communicate information with each unit and controls each unit. The configuration of the control unit is not limited, but examples include a control unit that includes a CPU (Central Processing Unit) for information processing, a memory device, a recording medium, an information communication device, etc. The control unit controls the operation of each unit according to a predetermined program, and sends information including an image (image information) to the image projection unit 1.

[0021] The image irradiating unit 1 irradiates light containing an image based on image information from the control unit. The specific configuration of the image irradiating unit 1 is not limited, and conventionally known devices such as a liquid crystal display device, an organic electroluminescence (EL) display device, or a combination of a laser light source and an optical modulation element can be used. In the example shown in FIG. 1, a liquid crystal display device is used that irradiates light from a light-emitting diode (LED) on the rear side. As will be described later, the image irradiating unit 1 includes a near display area 1b and a far display area 1c that display a near image and a far image, respectively. The far image displayed in the far display area 1c is irradiated as a first image light L1, and the near image displayed in the near display area 1b is irradiated as a second image light L2.

[0022] The free-form surface mirror 2 is an optical member that receives the first image light L1 and the second image light L2 via the reflecting prism 4 and reflects the first image light L1 and the second image light L2 toward the free-form surface mirror 3. The reflecting surface of the free-form surface mirror 2 is designed to expand the light diameter in the driver's viewing direction in order to project the first image light L1 and the second image light L2 as virtual images 7, 8 via the windshield 6. Here, "the light diameter expanding in the viewing direction" includes not only the case where the light diameter expands consistently after reflection, but also the case where the light diameter shrinks and expands after forming an image at an intermediate point.

[0023] 1 shows an example in which the first image light L1 and the second image light L2 reflected by the free-form surface mirror 2 are imaged at an intermediate imaging position F and then reach the free-form surface mirror 3. Here, the intermediate imaging position F is not limited as long as it is on the optical paths of the first image light L1 and the second image light L2, but it is preferable to set it between the free-form surface mirror 2 and the free-form surface mirror 3 because this makes it easier to ensure space for arranging the external light blocking unit 5.

[0024] The free-form surface mirror 3 is an optical member that receives the first image light L1 and the second image light L2 reflected by the free-form surface mirror 2 and reflects the first image light L1 and the second image light L2 toward the windshield 6. The reflective surface of the free-form surface mirror 3 is designed to expand the light diameter in the driver's viewpoint direction in order to project the first image light L1 and the second image light L2 as virtual images 7, 8 through the windshield 6. Here, the expansion of the light diameter in the viewpoint direction includes not only the case where the light diameter consistently expands after reflection, but also the case where the light diameter shrinks and expands after forming an image at an intermediate point.

[0025] The reflecting prism 4 is an optical member that reflects the first image light L1 emitted from the image projection unit 1 inside and then emits it, and transmits the second image light L2 as is. The detailed structure of the reflecting prism 4 will be described later, but since the first image light L1 is reflected inside the reflecting prism 4, a difference in optical path occurs between the first image light L1 and the second image light L2, and therefore the reflecting prism 4 corresponds to the imaging position adjustment unit in the present invention. In addition, it is preferable to provide a positioning unit or a holding unit in either the reflecting prism 4 or the image projection unit 1 that positions them relative to each other and holds them.

[0026] In the example shown in Fig. 1, the reflecting prism 4 is arranged to overlap the near display region 1b and the far display region 1c of the image projection unit 1. Here, "arranging the reflecting prism 4 to overlap the image projection unit 1" means that the region in which the reflecting prism 4 is arranged overlaps with the image display region of the image projection unit 1 in a planar view. The overlapping arrangement also includes cases where the reflecting prism 4 and the image projection unit 1 are in contact with each other and cases where they are not in contact with each other. The overlapping arrangement also includes cases where a light-transmitting optical member or a holding member for maintaining the distance between the reflecting prism 4 and the image projection unit 1 is interposed between them.

[0027] The external light blocking unit 5 is a member made of a light-shielding material, and has an opening formed in a part thereof, which is disposed so that the opening is located on the optical paths of the first image light L1 and the second image light L2. Therefore, the first image light L1 and the second image light L2 pass through the opening and are projected without being blocked by the external light blocking unit 5. Furthermore, even if external light such as sunlight entering the interior of the vehicle from above the windshield 6 is reflected by the free-form surface mirror 3 and travels toward the free-form surface mirror 2, most of the light is blocked by the external light blocking unit 5. This allows the external light blocking unit 5 to effectively block external light, reducing the amount of external light that reaches the image projection unit 1 and suppressing deterioration of the image projection unit 1 due to a rise in temperature.

[0028] 1, when the external light blocking unit 5 is disposed at the intermediate image position F, the area through which the first image light L1 and the second image light L2 pass is smallest. Therefore, it is possible to make the area of ​​the opening formed in the external light blocking unit 5 as small as possible, and external light can be blocked more efficiently.

[0029] The windshield 6 is a part provided in front of the driver's seat of the vehicle that transmits visible light. The windshield 6 corresponds to the display unit of the present invention because the windshield 6, on its inner surface, reflects the first image light L1 and the second image light L2 incident from the free-form surface mirror 3 toward the viewpoint and transmits light from outside the vehicle toward the viewpoint. While an example in which the windshield 6 is used as the display unit has been shown here, a combiner may be provided as a display unit separate from the windshield 6 and reflect light from the free-form surface mirror 3 toward the viewpoint. Furthermore, the display unit is not limited to being located at the front of the vehicle, and may be located to the side or rear as long as it projects an image toward the viewpoint of the passenger.

[0030] The virtual images 7 and 8 are images that are displayed as if they were formed in space when the first image light L1 and the second image light L2 reflected by the windshield 6 reach the viewpoint (eyebox) of the driver or the like. The positions at which the virtual images 7 and 8 are formed are determined by the optical path length of the light irradiated from the image irradiation unit 1 and the angle of spread of the light as it travels toward the viewpoint after being reflected by the free-form surface mirror 2, the free-form surface mirror 3, and the windshield 6. In the example shown in FIG. 1, a difference occurs in the optical path lengths of the first image light L1 and the second image light L2 due to the reflecting prism 4, and therefore the positions at which the virtual images 7 and 8 are formed from the viewpoint of the passenger are also different.

[0031] 1, the irradiation optical unit is a combination of the free-form surface mirror 2, the free-form surface mirror 3, and the reflecting prism 4, but the configuration of the irradiation optical unit is not limited to this. As an example, a reflecting mirror may be used in addition to the free-form surface mirrors 2 and 3, or a wavelength filter that cuts ultraviolet light and infrared light may be used.

[0032] FIG. 2 is a schematic diagram showing the display area of ​​an image projected from the image projection unit 1 in the image projection device 10 according to this embodiment. The entire display area 1a is the entire area in which the image of the image projection unit 1 is displayed. A part of the entire display area 1a is a near display area 1b, and another part is a far display area 1c. The far display area 1c displays a first image and corresponds to the first area in the present invention. The near display area 1b displays a second image and corresponds to the second area in the present invention. Examples of the second image displayed in the near display area 1b include a speed and volume indicator, a driving direction guide, etc. Examples of the first image displayed in the far display area 1c include auxiliary information related to driving, such as a warning image or emergency information.

[0033] Fig. 3 is a schematic diagram showing the structure of the reflecting prism 4 in this embodiment. As shown in Fig. 3, the reflecting prism 4 is made of a light-transmitting resin and is formed into a cylindrical shape with a parallelogram cross section. There are no restrictions on the material that makes up the reflecting prism 4, and materials such as glass or resin that transmit visible light well and have a high refractive index can be used.

[0034] One surface of the reflecting prism 4 is a surface disposed opposite the image projection unit 1 and serves as a light incident surface onto which the first image light L1 and the second image light L2 irradiated from the image projection unit 1 are incident. As shown in FIG. 3 , the region of the light incident surface facing the far display region 1c is the first incident portion 4a, and the region facing the near display region 1b is the second incident portion 4b. The surface facing the light incident surface is the light exit surface, and the regions from which the first image light L1 and the second image light L2 are emitted to the outside are the first exit portion 4c and the second exit portion 4d, respectively. The surface sandwiched between the first incident portion 4a and the second exit portion 4d is the first reflecting portion 4e, and the surface sandwiched between the second incident portion 4b and the first exit portion 4c is the second reflecting portion 4f. The first reflecting portion 4e and the second reflecting portion 4f are reflective surfaces that totally reflect the first image light L1 and correspond to the reflecting portions in the present invention. Here, the first reflecting portion 4e and the second reflecting portion 4f may or may not totally reflect the first image light L1. The first image light L1 may be totally reflected due to the difference in refractive index between the material constituting the reflecting prism 4 and the refractive index of air, or the first image light L1 may be totally reflected by forming a reflective film on the surface. Furthermore, a reflective film that improves reflectance may be formed on the first reflecting portion 4e and the second reflecting portion 4f, or a reflective sheet may be attached.

[0035] As shown in FIG. 3, the first image light L1 entering the reflecting prism 4 from the first incident portion 4a is reflected by the first reflecting portion 4e and the second reflecting portion 4f and is emitted from the first exit portion 4c toward the free-form surface mirror 2. On the other hand, the second image light L2 entering the reflecting prism 4 from the second incident portion 4b passes through the interior of the reflecting prism 4 and is emitted from the second exit portion 4d toward the free-form surface mirror 2. In this case, if the first reflecting portion 4e and the second reflecting portion 4f are inclined at 45 degrees with respect to the first incident portion 4a and the second exit portion 4d, then, assuming that the distance between the light incident surfaces is D and the width is W, the optical path length of the first image light L1 inside the reflecting prism 4 is D+W, while the optical path length of the second image light L2 is D. Therefore, when the first image light L1 and the second image light L2 are emitted via the reflecting prism 4, the first image light L1 will be projected as an image whose optical path length is longer by W.

[0036] In the image projection device 10 shown in FIGS. 1 and 2, a reflecting prism 4, which serves as an imaging position adjustment unit, is positioned at a position overlapping the far display region 1c and the near display region 1b. The reflecting prism 4 splits the paths of the first image light L1 from the far display region 1c and the second image light L2 from the near display region 1b, creating a difference in optical path. The first image light L1 and the second image light L2 emitted from the first and second exit portions 4c and 4d of the reflecting prism 4 reach the driver's viewpoint via the free-form surface mirrors 2 and 3 and the windshield 6. The free-form surface mirrors 2 and 3 included in the illumination optical unit expand the light diameters of the first image light L1 and the second image light L2 before reaching the viewpoint. Therefore, the driver perceives virtual images 7 and 8 formed by the first image light L1 and the second image light L2 as if they were formed at a predetermined distance. Here, the positions of the virtual images 7 and 8 for the first image are farther from the viewpoint than those for the second image.

[0037] In this embodiment, the reflecting prism 4 is used as an imaging position adjustment unit and is disposed opposite the entire display area 1a of the image projection unit 1, thereby creating a difference in the optical paths of the first image light L1 and the second image light L2. This makes it possible to reduce the space required for the image projection device 10 by using a common image projection unit 1 and free-form mirrors 2 and 3, while still allowing the imaging positions of the multiple virtual images 7 and 8 to be different.

[0038] Furthermore, in the reflecting prism 4, the relative positional relationship between the first incident portion 4a, the first reflecting portion 4e, the second reflecting portion 4f, the first exit portion 4c, the second incident portion 4b, and the second exit portion 4d is determined in advance by the outer shape. As a result, simply by aligning one reflecting prism 4 with the image irradiation unit 1, it is possible to generate an optical path difference due to multiple reflections and also align the optical axes of the first image light L1 and the second image light L2.

[0039] (Second embodiment) Next, a second embodiment of the present invention will be described with reference to Fig. 4. Description of content that overlaps with the first embodiment will be omitted. Fig. 4 is a schematic diagram showing a modified example of the reflecting prism 4 in this embodiment. This embodiment differs from the first embodiment in that an optical element is added to the reflecting prism 4, which is the imaging position adjustment unit.

[0040] In the example shown in FIG. 4(a), the second reflecting portion 4f of the reflecting prism 4 is a concave mirror. The concave shape of the second reflecting portion 4f is not limited, and examples include a parabolic surface, an ellipsoidal surface, and a free-form surface. Because the second reflecting portion 4f is a concave mirror, the first image light L1 that enters through the first incident portion 4a and is reflected by the first reflecting portion 4e is subjected to optical power when reflected by the second reflecting portion 4f. As a result, a change in focal length occurs between the first image light L1 and the second image light L2 due to the optical power of the second reflecting portion 4f in addition to the optical path difference W, and the imaging positions of the first image light L1 and the second image light L2 can be adjusted.

[0041] In the example shown in FIG. 4(b), the first incident portion 4a of the reflecting prism 4 has a lens shape. The surface shape of the first incident portion 4a is not limited. Because the first incident portion 4a has a lens shape, the first image light L1 incident from the first incident portion 4a receives optical power and enters the reflecting prism 4, is reflected by the first reflecting portion 4e and the second reflecting portion 4f, and is emitted from the first exit portion 4c. As a result, between the first image light L1 and the second image light L2, a change in focal length occurs due to the optical power of the first incident portion 4a in addition to the optical path difference W, and the imaging positions of the first image light L1 and the second image light L2 can be adjusted.

[0042] In the example shown in FIG. 4(c), the second exit portion 4d of the reflecting prism 4 is configured as a composite prism inclined with respect to the first exit portion 4c. The shape and inclination angle of the second exit portion 4d are not limited. Because the second exit portion 4d is inclined, the second image light L2 incident from the second entrance portion 4b is refracted when irradiated from the second exit portion 4d. This generates an optical path difference W between the first image light L1 and the second image light L2, and also generates an angular difference in the traveling directions of the first image light L1 and the second image light L2, allowing the light to be separated.

[0043] 4(a) to 4(c), the optical elements added to the reflecting prism 4 are not limited to those shown in Fig. 4(a) to 4(c), and multiple optical elements may be added. As an example, in addition to the first reflecting portion 4e and the second reflecting portion 4f, the first image light L1 may be reflected in multiple stages by other reflecting portions to further generate an optical path difference.

[0044] (Third embodiment) Next, a third embodiment of the present invention will be described with reference to Fig. 5. Description of content that overlaps with the first embodiment will be omitted. Fig. 5 is a schematic diagram showing the configuration of an image projection device 20 according to this embodiment. This embodiment differs from the first embodiment in that a lens having optical power is used as the imaging position adjustment unit.

[0045] 5, image projection device 20 includes image projection unit 1, free-form surface mirrors 2 and 3, lens 9, and external light blocking unit 5. Here, the combination of free-form surface mirror 2, free-form surface mirror 3, and lens 9 constitutes the projection optical unit of the present invention. Light projected from image projection device 20 is irradiated onto the driver's viewpoint via windshield 6 (display unit), and virtual images 7 and 8 are formed at a predetermined distance from windshield 6.

[0046] The lens 9 is an optical element having optical power and arranged opposite either the far display region 1c or the near display region 1b of the image projection unit 1. The shape of the lens 9 is not limited, but it is preferable to use a lens with a concave surface on the light incident side and a convex surface on the light exit side to increase the optical power. The material constituting the lens 9 is not limited, and materials such as glass or resin that transmit visible light well and have a high refractive index can be used.

[0047] In the example shown in Fig. 5, the lens 9 is arranged to overlap the far display area 1c of the image projection unit 1. Here, "arranging the lens 9 to overlap the image projection unit 1" means that the area where the lens 9 is arranged overlaps the image display area of ​​the image projection unit 1 in a planar view. The overlapping arrangement also includes cases where the lens 9 and the image projection unit 1 are in contact with each other and cases where they are not in contact with each other. The overlapping arrangement also includes cases where a light-transmitting optical member or a holding member for maintaining the distance between the lens 9 and the image projection unit 1 is interposed between the lens 9 and the image projection unit 1.

[0048] In the image projection device 20 shown in FIG. 5, a lens 9, which is an imaging position adjustment unit, is disposed at a position overlapping the far display region 1c, thereby making the focal length of the first image light L1 from the far display region 1c different from the focal length of the second image light L2 from the near display region 1b. The first image light L1 refracted by the lens 9 and the second image light L2 that does not pass through the lens 9 reach the driver's viewpoint via the free-form surface mirror 2, the free-form surface mirror 3, and the windshield 6, respectively. The first image light L1 and the second image light L2 reach the viewpoint after their light diameters are expanded by the free-form surface mirrors 2 and 3 included in the illumination optical unit. Therefore, the driver perceives virtual images 7 and 8 formed by the first image light L1 and the second image light L2 as if they were formed at a predetermined distance. At this time, the optical power of the lens 9 is applied to the first image light L1, so the composite focal length of the lens 9 and the first free-form surface mirrors 2 and 3 differs from the composite focal length for the second image light L2. This causes a difference in the image formation positions of the first image light L1 and the second image light L2.

[0049] In this embodiment, the lens 9 is used as an imaging position adjuster and is disposed opposite either the far display region 1c or the near display region 1b of the image projection unit 1, thereby generating a difference in the imaging positions of the first image light L1 and the second image light L2. This makes it possible to reduce the space required for the image projection device 20 by using the common image projection unit 1 and free-form mirrors 2 and 3, while still allowing the imaging positions of the multiple virtual images 7 and 8 to be different.

[0050] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. [Explanation of symbols]

[0051] 10, 20...Image projection device 1...Image irradiation unit 1a…Full display area 1b…Near display area 1c…Far display area 2,3...Free-form mirror 4...Reflective prism 4a...first entrance section 4b…Second incidence part 4c...1st output section 4d…Second output section 4e...1st reflection section 4f...Second reflector 5...External light blocking section 6...Windshield 7,8...Virtual image 9...Lens

Claims

1. An image projection device that projects a projection image onto a display unit for displaying a virtual image, an image irradiating unit that irradiates the first image light and the second image light; an illumination optical unit that illuminates the first image light and the second image light in a viewing direction via the display unit; the irradiation optical unit includes an image formation position adjustment unit that generates a difference in image formation positions of virtual images between the first image light and the second image light, the imaging position adjustment unit is a reflecting prism, the reflecting prism includes a first incident portion, a second incident portion, a reflecting portion, a first exit portion, and a second exit portion; the first image light is incident on the first incident portion, reflected by the reflecting portion, and emitted from the first exit portion; The second incident portion and the second exit portion are arranged opposite each other, and the second image light enters from the second incident portion, passes through the interior without being reflected by the reflecting portion, and is then emitted from the second exit portion.

2. 2. The image projection device according to claim 1, the image irradiating unit includes a first region that irradiates the first image light and a second region that irradiates the second image light, The image projection device is characterized in that the reflecting prism is arranged so that the first incident portion faces the first area and the second incident portion faces the second area.

3. 2. The image projection device according to claim 1, 10. An image projection device, wherein the first entrance portion of the reflecting prism is formed in the shape of a lens having optical power.

4. 4. The image projection device according to claim 3, the image irradiating unit includes a first region that irradiates the first image light and a second region that irradiates the second image light, The image projection device, characterized in that the first incident portion having a lens shape is disposed opposite the first area.

5. 5. The image projection device according to claim 1, An image projection device, characterized in that the imaging position of the virtual image of the first image light is farther from a viewpoint position than the imaging position of the second image light.

Images