JP5173869B2 - Head-mounted image display device - Google Patents

Description

  The present invention relates to a head-mounted image display device, and more particularly to a novel head-mounted image display device that can display a large-screen image.

  As a conventional head-mounted image display device, for example, a device that can be used in a mobile manner such as a headset type or a spectacle type has been proposed (see, for example, Patent Documents 1 and 2).

  FIG. 13 is a diagram showing a schematic configuration of a conventionally proposed headset-type head mounted image display device, where (a) is a front view, (b) is a side view, and (c) is a plan view. . This head-mounted image display device 100 is of the left eye type, and is a headset-type head support unit 101 held in the left ear of the observer M, and the head support unit 101 has a relay unit 102 and a holding unit. And a rod-shaped light guide unit 104 which is connected via the unit 103 and is held in the left eye visual field of the observer M. The rod-shaped light guide unit 104 includes an eyepiece optical unit 105 that is coupled to an end opposite to the holding unit 103 side. The head support unit 101, the relay unit 102, or the holding unit 103 incorporates a display element (not shown) such as a liquid crystal display element or an organic EL element that displays an image to be observed. The image light of the displayed image is emitted from the eyepiece optical unit 105 through the rod-shaped light guide unit 104. In addition, this structure is good also as a right eye type by comprising right-and-left reverse.

  The head-mounted image display apparatus 100 illustrated in FIG. 13 moves the head support unit 101 to the left of the observer M so that the image light emitted from the eyepiece optical unit 105 enters the left eye pupil of the observer M. By holding in the ear and looking into the eyepiece optical unit 105 in that state, that is, by making the visual axis of the left eye substantially coincide with the outgoing optical axis of the eyepiece optical unit 105, the image displayed on the display element (not shown) An enlarged virtual image can be observed.

  FIG. 14 is a perspective view showing a schematic configuration of a conventionally proposed glasses-type head-mounted image display device. This head-mounted image display device 110 is a right-eye type that is integrated with spectacles, and the spectacles for the right eye in the visual field of the observer's right eye through a spectacle frame 111 via a support part 112 and a holding part 113. It has a rod-shaped light guide 115 that is held near the front of the lens 114. The rod-shaped light guide 115 has an eyepiece optical unit 116 coupled to an end opposite to the holding unit 113 side. The spectacle frame 111 or the support unit 112 or the holding unit 113 incorporates a display element (not shown) such as a liquid crystal display element or an organic EL element that displays an image to be observed, and is displayed on the display element. The image light of the obtained image is emitted from the eyepiece optical unit 116 through the rod-shaped light guide unit 115.

  In the head-mounted image display device 110 shown in FIG. 14, the image light emitted from the eyepiece optical unit 116 enters the right eye pupil through the eyeglass lens 114 when the observer puts on the eyeglass frame 111. ing. Therefore, the observer puts on the eyeglass frame 111 and looks into the eyepiece optical unit 116, that is, makes the right eye's visual axis substantially coincide with the outgoing optical axis of the eyepiece optical unit 116 to display on the display element (not shown). An enlarged virtual image of the captured image can be observed.

  An eyeglass-type head-mounted image display device that can be attached to and detached from a normal eyeglass frame and is used in the same manner as in FIG. 14 has been proposed.

  FIG. 15 is a schematic diagram of an optical path of a conventional head-mounted image display device. FIG. 15A shows optical paths of image light emitted from the upper, central, and lower portions of the display element 117 at different angles. The image light from the display element 117 forms an image 120 on the retina of the eyeball 119 of the observer as if it is light from a distant display image by passing through an eyepiece lens 118 constituting an eyepiece optical unit. To do. Thereby, the observer can recognize as if the display image is displayed at a set distance (for example, 2 m away).

  In the present application, in order to display the optical path diagram in an easy-to-understand manner, only the chief rays are illustrated as shown in FIG.

Japanese translation of PCT publication No. 2003-502713 JP 2006-3879 A

  By the way, for example, in an information display, there is a need to view a lot of information on one screen at the same time. In addition, a larger display screen may be required to display graphic information and the like. However, in the conventional head-mounted image display device described above, there is only one eyepiece optical unit that emits image light, and information is displayed on one display screen by the one eyepiece optical unit. . Moreover, since the head-mounted image display device can be used on a mobile device, its display screen is relatively small, and therefore the amount of information displayed is relatively small. For this reason, the conventional head-mounted image display device may not sufficiently meet the need to display a large amount of information on a large screen and view it simultaneously, as in an information display.

  In particular, as disclosed in Patent Document 2, the width of the projection cross section in the visual axis direction of the eyepiece optical unit and the rod-shaped light guide unit positioned in the visual field of the observer is set to 4 mm or less, and the eyepiece optical unit and the rod-shaped light guide unit are arranged. When see-through is possible, the display screen becomes smaller, and it becomes difficult to display a lot of information and graphic information with one eyepiece optical unit.

  In order to solve this problem, it is conceivable to provide a plurality of display elements and an eyepiece optical unit to display information on a multi-screen. However, if a plurality of eyepiece optical units are simply provided to display information on a multi-screen, undesirable overlap and gaps may occur between the plurality of display images observed by the observer, making it difficult to see the display screen. Concerned. Furthermore, in this method, although the amount of information to be displayed can be increased by using a multi-screen, for example, an image such as map information is displayed as a single large-screen image having a wide angle of view within the observer's field of view. Is difficult to display.

  Accordingly, an object of the present invention made in view of such a point is to provide a head-mounted image display device capable of displaying a large-screen image without deteriorating mobility.

The invention of the head mounted image display device according to claim 1, which achieves the above object,
An image light dividing unit for dividing image light to be displayed into a plurality of partial image lights;
A plurality of eyepiece optical units that emit image light to be displayed toward the corresponding eyeballs;
A head mounting unit that holds the image light splitting unit and the plurality of eyepiece optical units, and is detachably mounted on the head of an observer;
In the state where the head mounting unit is mounted on the observer's head, the images by the image light from the plurality of eyepiece optical units are adjacent to each other in the visual field of the left or right eyeball of the observer. Holding the image light splitting unit and the plurality of eyepiece optical units to be displayed as a large screen;
Each of the plurality of eyepiece optical units is spaced apart and arranged in parallel, and the width of the projection cross section in the visual axis direction of the observer is equal to or less than the pupil diameter, and each of the plurality of eyepiece optical units is an eyepiece. The lens has a lens, and the curved surface of the eyepiece lens coincides with a part of the same lens curved surface .

According to a second aspect of the present invention, in the head-mounted image display device according to the first aspect, each of the plurality of eyepiece optical units has an interval between projection cross sections in the visual axis direction of the observer. It is characterized by being arranged below the pupil diameter .

According to a third aspect of the present invention, in the head-mounted image display device according to the first or second aspect , the eyepiece optical unit has a width equal to or smaller than a pupil diameter in a projection cross section in the visual axis direction of the observer. and it is characterized in Rukoto held by rod-shaped light transmission section having.

According to a fourth aspect of the present invention, in the head-mounted image display device according to any one of the first to third aspects, the image light splitting unit includes a rod-shaped light guide unit in which one end is split. The eyepiece optical unit is coupled to the divided end portions .

According to a fifth aspect of the present invention, in the head-mounted image display device according to the fourth aspect , the plurality of eyepiece optical units have equal focal lengths and are divided portions of the rod-shaped light guide unit. The length of is less than half of the focal length .

The invention according to claim 6 is the head-mounted image display device according to claim 3, wherein the pupil diameter is approximately 4 mm, which is an average pupil diameter size in a normal environment. Is.

  According to the present invention, images with image light from a plurality of eyepiece optical units are displayed as a large screen adjacent to each other in the field of view of the observer in a state where the head mounted part is mounted on the head of the observer. In addition, a plurality of eyepiece optical units are held. Thereby, it is possible to combine the display screens of the plurality of eyepiece optical units and display them as a large screen image in the observer's field of view without deteriorating the mobility.

1 is a perspective view showing a schematic configuration of a head-mounted image display device according to a first embodiment of the present invention. FIG. 2 is a schematic perspective view of an upper bar light guide and a lower bar light guide shown in FIG. 1. It is a figure which shows the outline of the eyepiece optical system in FIG. It is a figure explaining the positional relationship of the upper and lower eyepiece optical part in FIG. 1, and an eyeball. It is a figure which shows the display position of the display screen in the visual field by the head mounted image display apparatus which concerns on 1st Embodiment. It is a figure which shows the outline of the optical system of 2nd Embodiment in this invention. It is a perspective view which shows schematic structure of the head mounted image display apparatus which concerns on 3rd Embodiment of this invention. FIG. 8 is a schematic perspective view of the upper bar light guide and the lower bar light guide shown in FIG. 7. It is a figure which shows the outline of the eyepiece optical system in FIG. It is explanatory drawing which shows the width of an eyepoint at the time of using the head mounted image display apparatus of 3rd Embodiment. It is a perspective view which shows schematic structure of the head mounted image display apparatus which concerns on 4th Embodiment of this invention. It is a figure which shows the display position of the display screen in the visual field by the head mounted image display apparatus which concerns on 4th Embodiment. It is a figure which shows schematic structure of the conventional headset type head mounted image display apparatus. It is a perspective view which shows schematic structure of the conventional spectacles type head mounted image display apparatus. It is a schematic diagram of an optical path of a conventional head-mounted image display device.

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

(First embodiment)
FIG. 1 is a perspective view showing a schematic configuration of a head-mounted image display device according to a first embodiment of the present invention. The head-mounted image display device 10 is a right-eye type that is integrated with glasses. The rim 12 of the spectacle frame 11 holds an image emitting portion 14 near the right hinge 13. The image emitting unit 14 holds the upper bar-shaped light guide unit 21u and the lower bar-shaped light guide unit 21d in parallel at a predetermined interval in the vertical direction. The upper bar-shaped light guide 21u and the lower bar-shaped light guide 21d are configured to extend into the right eye visual field of the observer in a state where the spectacle frame 11 which is a head-mounted part is mounted.

  As shown in the schematic perspective view of FIG. 2, the upper bar light guide 21u is formed in, for example, a rectangular cross section, and the liquid crystal display element or organic EL display in which the incident end surface of one end thereof is held in the image emitting unit 14 It is held facing the upper display element 23u made of an element or the like. Then, the image light of the image displayed on the upper display element 23u is guided from the incident end surface to the other end portion, reflected at the other end portion toward the observer's eyeball, and emitted from the side surface. An upper eyepiece optical unit 25u including an eyepiece lens having a curvature corresponding to a virtual image position for displaying an image by the image light is held in the image light emitting portion of the upper bar light guide 21u.

  Similarly, as shown in the schematic perspective view of FIG. 2, the lower bar-shaped light guide portion 21 d is formed in, for example, a rectangular cross section, and the liquid crystal display element in which the incident end surface of one end thereof is held in the image emitting portion 14. Or the lower display element 23d made of an organic EL display element or the like, and held below the upper bar light guide. Then, the image light of the image displayed on the display element 23d is guided from the incident end surface to the other end portion, reflected at the other end portion toward the eyeball of the observer, and emitted from the side surface. A lower eyepiece optical unit 25d composed of an eyepiece having a curvature corresponding to a virtual image position for displaying an image by the image light is held in the image light emitting portion of the lower bar light guide 21d.

  In the present embodiment, the display positions of the virtual images by the upper eyepiece optical unit 25u and the lower eyepiece optical unit 25d are substantially equal. Therefore, the curvatures of the eyepiece lenses that constitute the upper eyepiece optical unit 25u and the lower eyepiece optical unit 25d are substantially equal. In the present embodiment, the emission direction of the image light emitted from each of the eyepiece optical units 25u and 25d is not parallel but has an inclination in the vertical direction toward the center of the eyeball. For this reason, the upper bar-shaped light guide 21u and the lower bar-shaped light guide 21d are disposed so as to be inclined with respect to each other.

  FIG. 3 is a diagram showing an outline of the optical system of the head-mounted image display apparatus 10 of FIG. The upper display element 23u and the upper eyepiece optical unit 25u constitute an upper eyepiece optical system 31u. In this optical system 31u, the image light emitted from the upper display element 23u passes through the upper eyepiece optical unit 25u, and the retina in the eyeball 32. The upper image 33u is formed on the top. Further, the lower display element 23d and the lower eyepiece optical unit 25d constitute a lower eyepiece optical system 31d. In this optical system 31d, image light emitted from the display element 23d passes through the lower eyepiece optical unit 25d. Then, the lower image 33d is formed on the retina in the eyeball 32.

  In FIG. 3, when the upper image 33u and the lower image 33d are displayed adjacent to each other without a gap, the boundary is set as an adjacent point 34 in FIG. As shown in FIG. 3, the adjacent point 34 is formed by a light beam 35u emitted from the lower end of the upper eyepiece optical unit 25u and a light beam 35d emitted from the upper end of the lower eyepiece optical unit 25d passing through the pupil and onto the retina. It is a point to image. In order for such an adjacent point to exist, the light ray 35u and the light ray 35d are emitted from one point that is the lowest point of the virtual image of the upper display element 23u and also the highest point of the virtual image of the lower display element 23d. Must be incident on the eyeball like a ray of light. Here, since the pupil diameter of the human eyeball in a normal environment is as small as about 4 mm and the virtual image position is set from several tens of centimeters to infinity, the light beams 35u and 35d are light beams that intersect at a distance of several tens of centimeters or more. It becomes a parallel light beam, and the distance between the two light beams needs to be 4 mm or less.

  FIG. 4 is a diagram for explaining the relationship between the positions and sizes of the upper eyepiece optical unit 41u, the lower eyepiece optical unit 41d, and the eyeball 32 in FIG. The upper eyepiece optical unit 41u includes the upper eyepiece optical unit 25u and the upper eyepiece optical system 31u, and the lower eyepiece optical unit 41d is similarly configured with the lower eyepiece optical unit 25d and the lower eyepiece optical system. 31d is included. As described in the cited document 2, the widths 42u and 42d of the projection cross section (including the portion that obstructs the visual field) of the respective eyepiece optical units 41u and 41d in the visual axis direction of the observer are equal to or smaller than the pupil diameter, that is, the normal environment. With a thickness of 4 mm or less, a see-through image can be observed. Further, as described in FIG. 3, in order to display two display screens adjacent to each other, a light beam 35u emitted from the lowermost part of the upper display element 23u and a light beam 35d emitted from the uppermost part of the lower display element 23d. Therefore, the distance 43 between the projection cross sections in the visual axis direction of the observer of the two eyepiece optical units 41u and 41d is set to a pupil diameter, that is, 4 mm or less. Deploy.

  In this way, as shown in FIG. 5, the upper display screen 44u by the image light guided by the upper bar light guide 21u and emitted from the upper eyepiece optical unit 25u in the visual field of the right eye of the observer, The lower display screen 44d by the image light guided by the lower bar light guide 21d and emitted from the lower eyepiece optical unit 25d is displayed adjacent to the upper and lower sides. The display contents of the display elements 23u and 23d are displayed by the display image control unit (not shown) so that the display screens 44u and 44d are arranged adjacent to each other and seem to display an image as an integrated large screen. Control.

  Thus, according to the present embodiment, the upper display element 23u and the lower display element are displayed so that the display images of the upper display element 23u and the lower display element 23d are adjacently displayed in the vertical direction in the field of view of the observer. Since the image light from 23d is emitted toward the observer's eyeball from the upper eyepiece optical unit 25u and the lower eyepiece optical unit 25d, respectively, the head provided with a single eyepiece optical unit having the same width. An apparent large screen image can be displayed as compared with the case of using a part-mounted image display device. As a result, a large amount of information and graphic information can be displayed on this single large screen.

  Furthermore, by setting the width of the projected cross section in the direction of the visual axis of the observer in each of the eyepiece optical units 25u and 25d to be equal to or smaller than the pupil diameter, it is possible to display with a see-through while being a large screen. In addition, by setting the interval of the projected cross section in the visual axis direction of the observer for each of the eyepiece optical units 25u and 25d to be equal to or smaller than the pupil diameter, a plurality of screens displayed adjacent to each other in the field of view can be arranged without gaps. .

(Second Embodiment)
FIG. 6 is a diagram showing an outline of the optical system of the head-mounted image display device according to the second embodiment of the present invention. In the present embodiment, in place of the upper eyepiece optical unit 25u and the lower eyepiece optical unit 25d that are arranged apart from each other in the first embodiment, the upper eyepiece optical unit 51u and the lower eyepiece light that are arranged adjacent to each other. It is configured using the undergraduate 51d. In FIG. 6, the upper and lower display elements 52u and 52d are shown on the back surface of the eyepiece optical units 51u and 51d for convenience, but both are held by the rim of the frame as in the case of the first embodiment. It is held by the image ejection unit. Further, the image light from the display elements 52u and 52d is received by the upper eyepiece optical unit 51u by an upper bar light guide (not shown) and a lower bar light guide (not shown) arranged without a gap, respectively. And is guided to the lower eyepiece optical unit 51d. Other configurations are the same as those of the first embodiment.

  In the present embodiment, similarly to the first embodiment, the two eyepiece optical units 51u and 51d are arranged adjacent to each other in the vertical direction, and the image light from the display elements 52u and 52d is emitted to the observer's eyeball, respectively. Thus, the display images of the two display elements 52u and 52d can be displayed as a large screen adjacent to each other in the vertical direction within the visual field of the observer. However, in this case, there is no gap between the upper eyepiece optical unit 51u and the lower eyepiece optical unit 51d, and the width of the projection cross section of the eyepiece optical units 51u and 51d in the visual axis direction of the observer is larger than the pupil diameter. Is too large, the display image cannot be observed as a see-through image.

(Third embodiment)
FIG. 7 is a perspective view showing a schematic configuration of a head-mounted image display device according to the third embodiment of the present invention. The head-mounted image display device 60 is replaced with an image emitting unit 14 in place of the upper bar-shaped light guide unit 21u and the lower bar-shaped light guide unit 21d held by the image emitting unit 14 in the first embodiment. The image light dividing unit 61 having a tip portion divided into two is held, and this divided portion is in the right eye visual field of the observer in a state where the spectacle frame 11 which is a head mounting unit is mounted. Configured to extend.

  As shown in the schematic perspective view of FIG. 8A, the image light splitting unit 61 is, for example, an upper bar-shaped light guide so that the front end of a rectangular parallelepiped is formed with a horizontal V-shaped cut in a longitudinal section of the rectangular parallelepiped. The shape is divided into a part 62u and a lower bar light guide part 62d. The incident surface of the end portion on the non-divided side is held so as to face one display element 63 made up of a liquid crystal display element, an organic EL display element or the like held in the image emitting section 14. Then, the partial image light emitted from the portion including the upper half of the image displayed on the display element 63 is guided from the incident end surface to the upper bar light guide portion 62u, and reflected at the end portion toward the eyeball side of the observer. The light is emitted from the upper eyepiece optical unit 64u held on the side surface. Further, the partial image light emitted from the portion including the lower half of the image displayed on the display element 63 is guided from the incident end surface to the lower rod-shaped light guide portion 62d, and at the end portion toward the eyeball side of the observer. The light is reflected and emitted from the lower eyepiece optical unit 64d held on the side surface.

  The upper eyepiece optical unit 64u and the lower eyepiece optical unit 64d are eyepieces having a curvature corresponding to a virtual image position for displaying an image by the image light. In the present embodiment, as shown in a lens cross-sectional view in FIG. 8B, the curved surfaces of the eyepiece lenses constituting the upper eyepiece optical unit 64u and the lower eyepiece optical unit 64d are shapes obtained by cutting out part of the same curved surface. The distances to the image display positions by the upper partial image light and the lower partial image light are made substantially equal. In FIG. 8, the eyepieces of the eyepiece optical units 64u and 64d are lenses that are off the optical axis so that the image light emitted from each of them is tilted toward the center of the eyeball, as shown in FIG. A surface is used to refract image light. For example, the eyepieces of the eyepiece optical units 64u and 64d are each configured as a part of a convex lens whose optical axis coincides with a straight line connecting the center of the eyeball and the center of the pupil.

  FIG. 9 is a diagram showing an outline of the optical system of the present embodiment. The distance from the display element 63 to the exit window of the eyepieces of the eyepiece optical units 64u and 64d is made substantially equal to the focal length of the eyepiece. As a result, the image light emitted from each display position of the display element 63 enters the image light dividing unit 61, and is substantially parallel through the upper or lower bar-shaped light guides 62u and 62d and the eyepiece optical units 64u and 64d. It becomes light and enters the eyeball 32 to form a display image 65 on the retina. In the present embodiment, the width of the projection cross section in the visual axis direction of the observer of the upper and lower eyepiece optical units 64u and 64d is set to a pupil diameter in a normal environment, that is, 4 mm or less. As a result, the display image can be displayed by see-through. Further, the width between the eyepiece optical units 64u and 64d is also set to be equal to or smaller than the pupil diameter. As a result, in this embodiment as well, as described with reference to FIG. 4 in the first embodiment, the partial image light from the upper eyepiece optical unit 64u and the lower eyepiece optical unit 64d is transmitted to the observer. They are displayed as a single unit in the field of view. In this case, depending on the depth of the horizontal V-shaped cut, the partial image light from the upper eyepiece optical unit 64u and the partial image light from the lower eyepiece optical unit 64d are partially overlapped and displayed. As a result, the image displayed on the display element 63 is displayed as one image on a large screen as compared with the case where a single eyepiece optical unit having the same width is used.

  FIG. 10 is an explanatory diagram showing a range in which an image can be observed when the head-mounted image display device according to the present embodiment is used, that is, the size of the eye point. FIG. FIG. 10B shows, as a comparative example, a display element 63 having the same size and shape as the present embodiment, and the width of the projection cross section in the visual axis direction of the observer is equal to or smaller than the pupil diameter. It is a figure shown about the optical system at the time of using the single eyepiece optical part 64 of this, and the single rod-shaped light guide part 62. FIG. FIGS. 10A and 10B show the arrival positions of the image light emitted from the upper and lower ends of the display element in the vicinity of the observer's pupil. In FIG. 10A, when the lengths of the divided upper and lower bar light guides 62u and 62d are less than half the focal length of the eyepieces of the eyepiece optical parts 64u and 64d, the lower end of the display element 63 The image dividing unit 61 can be configured to secure an optical path of image light from the upper part to the upper eyepiece optical part 64u and image light from the upper end part of the display element 63 to the lower eyepiece optical part 64d. Therefore, in the present embodiment shown in FIG. 10A, the image light passing through the upper eyepiece optical unit 64u and the lower eyepiece optical unit 64d are combined, and the eyepiece optical unit 64 shown in FIG. A wider eye point 66 can be formed than in one case.

  As described above, according to the present embodiment, the image light dividing unit divides image light from one display element 63 into partial image light, and the divided image light is displayed as an integrated image in the field of view. As described above, since each partial image light is emitted from the eyepiece optical units 62u and 62d toward the observer's eyeball, the width of the partial image light is the same as that of the present embodiment. Compared to the case of using a head-mounted image display device equipped with an eyepiece optical unit, a large screen image can be displayed, and a large amount of information and graphic information can be displayed on an apparent single screen. It can be displayed easily. In addition, since the eye point becomes wide, even if the positional relationship between the eyeball and the eyepiece optical unit slightly varies in the vertical direction due to the positional deviation of the head-mounted image display device, the image can be continuously observed stably. Is possible.

  Furthermore, by setting the width of the projection cross section in the direction of the visual axis of the observer in each of the eyepiece optical units 62u and 62d to be equal to or smaller than the pupil diameter, it is possible to display with a see-through while being a large screen. Further, by setting the interval of the projected cross section in the visual axis direction of the observer for each of the eyepiece optical units 62u and 62d to be equal to or smaller than the pupil diameter, a plurality of images can be arranged in the field of view without any gap.

(Fourth embodiment)
FIG. 11 is a perspective view showing a schematic configuration of a head-mounted image display apparatus according to the fourth embodiment of the present invention. In the head-mounted image display device 70, in the first embodiment, instead of the image emitting unit 14, the right image emitting unit 71r held between the right end of the right-eye lens and the hinge 13 of the frame 11 is used. And a left-side image emitting portion 71l held between the left end of the right-eye lens and the rim 12 of the frame. The right end of the right rod-shaped light guide 73r is coupled to and held by the right image emitting unit 71r. Further, the left end of the left bar-shaped light guide portion 73l is coupled to and held by the left image emitting portion 71l. The right rod-shaped light guide portion 73r and the left rod-shaped light guide portion 73l are configured to extend into the right eye visual field of the observer in a state where the spectacle frame 11 which is a head-mounted portion is worn.

  The right image emitting unit 71r and the left image emitting unit 71l each hold a display element (not shown) therein, and the right bar light guiding unit 73r and the left bar light guiding unit 73l are the bar light guiding unit 25u described in FIG. Or similarly to 25d, it is comprised so that the image light from a display element may be inject | emitted from an eyepiece optical part (not shown). However, in the present embodiment, the right rod-shaped light guide 73r and the left rod-shaped light guide 73l may be positioned horizontally at the approximate center of the field of view. In this case, the rod-shaped light guide of the first embodiment. Unlike 25u and 25d, it is not necessary to incline and arrange the rod-shaped light guides 73r and 73l so that the emission direction of the image light is inclined up and down. Strictly speaking, the left bar-shaped light guide section 73l has a shape that is reversed from the left and right with respect to the bar-shaped light guide section 25u or 25d in FIG.

  In the present embodiment, the widths of the rod-shaped light guides 73r and 73l and the width of the projection cross section in the observer's visual axis direction in each of the eyepiece optical units (the width in the vertical direction in FIG. 11) are made equal to or smaller than the pupil diameter. . Further, the eyepiece optical units held by the right and left rod-shaped light guides 73r and 73l are spaced from each other in the projection cross section in the visual axis direction of the observer, that is, the left end and the left rod of the right rod-shaped light guide 73r. The distance from the right end of the light guide portion 73l is kept below the pupil diameter.

  The eyepiece optical unit has described the case where the eyepiece optical units 41u and 41d are arranged vertically in FIG. 4 by setting the horizontal interval of the projection cross section in the visual axis direction of the observer to be equal to or smaller than the pupil diameter. According to the same principle, two display screens can be connected and displayed in the horizontal direction within the field of view of the observer. That is, as shown in FIG. 12, the right display image 74r guided by the right rod-shaped light guide 73r and the left rod-shaped light guide 73l are guided to approximately the center in the visual field of the right eye of the observer. The left display image 74l is displayed adjacent to the left and right to form an apparent large screen image.

  According to the present embodiment, the two eyepiece optical units are provided in the horizontal direction so as to be spaced apart from each other by a predetermined interval, thereby displaying an apparent large screen image in the horizontal direction in the field of view of the observer. be able to. Furthermore, since the width of the projected cross section in the visual axis direction of the observer of the rod-shaped light guides 73r and 73l and the eyepiece optical unit is set to be equal to or smaller than the pupil diameter, display by see-through is possible.

  In addition, this invention is not limited only to the said embodiment, Many deformation | transformation or a change is possible. For example, the head-mounted image display device may be configured by providing an image emitting unit, a rod-shaped light guide unit, an eyepiece optical unit, and the like on the left side or both eyes.

  Moreover, in each said embodiment, although the rod-shaped light guide part has faced the horizontal direction, it is not restricted to this. For example, an image emitting unit may be provided on the upper part of the spectacle frame, and the rod-shaped light guide unit may be extended and held in the field of view vertically downward therefrom. Or you may hold | maintain a rod-shaped light guide part to a spectacles frame so that it may extend in the diagonal direction. In addition, each rod-shaped light guide unit may be omitted, and the display element may be held on the head mounting unit so as to face each eyepiece optical unit, so that a virtual image can be observed.

  Further, three or more eyepiece optical units may be provided. By setting the width of each eyepiece optical part and the interval between the eyepiece optical parts to be equal to or smaller than the pupil diameter of the observer, it is possible to display a large screen image in the observer's field of view with three or more image lights. is there.

  Further, the head-mounted image display device according to the present invention is not limited to the glasses type, and can be configured as a headset type or as a glasses removable type.

DESCRIPTION OF SYMBOLS 10 Head-mounted image display apparatus 11 Eyeglass frame 12 Rim 13 Hinge 14 Image emission part 21u Upper rod-shaped light guide part 21d Lower rod-shaped light guide part 23u Upper display element 23d Lower display element 25u Upper eyepiece optical part 25d Lower eye contact Eye optical unit 31u Upper eyepiece optical system 31d Lower eyepiece optical system 32 Eyeball 33u Upper image 33d Lower image 34 Adjacent point 35u Light beam 35d Light beam 41u Upper eyepiece optical unit 41d Lower eyepiece optical unit 42u Upper eyepiece optical unit viewer's view Width of projection cross section in axial direction 42d Width of projection cross section in observer's visual axis direction of lower eyepiece optical unit 43 Distance of projection cross section in visual axis direction of observer of eyepiece optical unit 44u Upper display screen 44d Lower Side display screen 51u Upper eyepiece optical unit 51d Lower eyepiece optical unit 52u Upper display element 52d Lower display element 53u Upper eyepiece optical system 53d Lower eyepiece optical system 60 Head-mounted image display device 61 Image light dividing unit 62 Bar light guide unit 62u Upper bar light guide unit 62d Lower bar light guide unit 63 Display element 64 Eyepiece optical unit 64u Upper eyepiece optical unit 64d Lower eyepiece optical unit 65 Display image 66 Eye point 70 Head-mounted image display device 71r Right image emitting unit 71l Left image emitting unit 73r Right bar light guide unit 73l Left bar light guide unit 74r Right display image 74l Left display image

Claims (6)

An image light dividing unit for dividing image light to be displayed into a plurality of partial image lights;
A plurality of eyepiece optical units that emit image light to be displayed toward the corresponding eyeballs;
A head mounting unit that holds the image light splitting unit and the plurality of eyepiece optical units, and is detachably mounted on the head of an observer;
In the state where the head mounting unit is mounted on the observer's head, the images by the image light from the plurality of eyepiece optical units are adjacent to each other in the visual field of the left or right eyeball of the observer. Holding the image light splitting unit and the plurality of eyepiece optical units to be displayed as a large screen;
Each of the plurality of eyepiece optical units is spaced apart and arranged in parallel, and the width of the projection cross section in the visual axis direction of the observer is equal to or less than the pupil diameter, and each of the plurality of eyepiece optical units is an eyepiece. A head-mounted image display device comprising a lens, wherein a curved surface of the eyepiece lens coincides with a part of the same lens curved surface . Wherein each of the plurality of eyepiece optical part, a distance of each of the projected section of the visual axis direction of the observer, the head-mounted according to claim 1, characterized in that it is arranged as below the pupil diameter or less Image display device. 3. The head-mounted type according to claim 1, wherein the eyepiece optical unit is held by a rod-shaped light guide unit having a width equal to or smaller than a pupil diameter in a cross section projected in the visual axis direction of the observer. Image display device. The image light splitting unit is made rod-shaped light transmission portion having an end divided, any one of claims 1 to 3, characterized in that by coupling the eyepiece optical unit to the divided end portion The head-mounted image display device described in 1. Wherein the plurality of eyepiece optical unit has a focal length equal to each other, the length of the divided portions of the rod-shaped light transmission unit, according to claim 4, characterized in that less than half of the focal length Head-mounted image display device. The head-mounted image display device according to claim 3 , wherein the pupil diameter is approximately 4 mm, which is an average pupil diameter size in a normal environment.

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