JP4586393B2 - Retina scanning image display device - Google Patents

Description

  The present invention relates to a retinal scanning image display apparatus that can directly display an image on the retina of an observer's eye M.

As shown in Patent Document 1 and the like, a retinal scanning image display device according to the prior art has been proposed. As shown in FIG. 5, the retinal scanning image display apparatus 100 includes a light beam output unit 101 that outputs a light beam K, and a scanning unit that scans the retina M2 through the pupil M1 of the observer's eye M. 102, and an image is displayed on the retina M2 of the eye M of the observer by transmitting the light beam K from the light beam output unit 101 to the scanning means 102 through the optical fiber 103 or the like.
JP 2003-315728 A

  As described above, the retinal scanning image display apparatus 100 scans the light beam K onto the retina M2 of the observer's eye M, and aligns the light beam K with the pupil M1 of the observer's eye M with high accuracy. If not, the image cannot be accurately displayed on the retina M2 of the eye M. However, as shown in FIG. 5, the cross-sectional area of the light beam K is circular and very narrow. For this reason, there is a problem that the operation of aligning the light flux K with the retina M2 of the eye M of the observer is very difficult and complicated.

  The present invention has been made in view of the above prior art, and an object of the present invention is to provide a retinal scanning image display device that can easily align the luminous flux K with the retina of the eye M of the observer. It is in.

The invention according to claim 1 is a retinal scanning image display device that displays an image on the retina of an observer by including a light beam output unit that outputs a light beam and a scanning unit that scans the retina with the light beam. ,
The apparatus further comprises a light beam cross-sectional enlargement unit that enlarges a cross-sectional area of the light beam incident on the pupil of the observer more than a cross-sectional area of the light beam incident on the scanning unit.

  According to a second aspect of the present invention, in the retinal scanning image display device according to the first aspect, the light beam cross-section enlarging means expands the cross-sectional shape of the light beam incident on the pupil at least in the horizontal direction. Is.

According to the first aspect of the present invention, in the retinal scanning image display device, the scanning unit includes a first scanning unit that scans an incident light beam in a first scanning direction, and a scanning speed lower than that of the first scanning unit. And a second scanning means for scanning in a second scanning direction intersecting with the first direction.

According to the first aspect of the present invention, in the retinal scanning image display device, the first scanning direction of the first scanning unit is a vertical direction corresponding to the vertical direction of the eye of the observer, and the second The second scanning direction of the scanning means is a horizontal direction corresponding to the left-right direction of the eyes of the observer .

According to a third aspect of the present invention, in the retinal scanning image display device according to the first or second aspect, the light beam cross-sectional enlargement unit has a cross-sectional shape with respect to a plane orthogonal to the traveling direction of the light beam incident on the pupil. The width of the second scanning unit in the second scanning direction is larger than the width of the first scanning unit in the first scanning direction.

According to the first aspect of the present invention, in the retinal scanning image display device, the first scanning unit is provided in a stage preceding the second scanning unit, and the light beam cross-sectional enlargement unit includes the first scanning unit and the second scanning unit. It is characterized by being provided between the means.

In the retinal scanning image display device according to the present invention, the light beam cross-sectional enlargement means is provided between the second scanning means and the pupil.

According to a fourth aspect of the present invention, in the retinal scanning image display device according to any one of the first to third aspects, the light beam cross-section enlarging unit is directed in the second scanning direction of the second scanning unit. A pair of a first lens having a positive refractive power and a second lens provided downstream of the first lens and having a negative refractive power toward the second scanning direction of the second scanning means. It is characterized by comprising.

According to a fifth aspect of the present invention, in the retinal scanning image display device according to the fourth aspect, the first lens and the second lens are constituted by cylindrical lenses.

The present invention is a retinal scanning image display device that displays an image on the retina of an observer by including a light beam output unit that outputs a light beam and a scanning unit that scans the light beam on the retina, and is incident on the pupil The cross-sectional shape with respect to the plane perpendicular to the traveling direction of the luminous flux is such that the horizontal width is larger than the vertical width.

  According to the first aspect of the present invention, since the cross-sectional area of the light beam incident on the pupil of the eye M of the observer can be made larger than the cross-sectional area of the light beam incident on the scanning means, the light beam is Can be easily aligned with the pupil of the eye M.

  According to the second aspect of the present invention, the light beam can be easily aligned with the pupil of the observer's eye M at least in the horizontal direction.

According to the first aspect of the present invention, the first scanning unit that scans the incident light beam in the first direction, the scanning speed is lower than that of the first scanning unit, and intersects the first direction. In the retinal scanning image display apparatus including the second scanning unit that scans in the second direction, the light beam can be easily aligned with the pupil of the eye M of the observer.

According to the invention described in claim 1, a first scanning means for scanning the light beam incident to the vertical direction, the second scanning means for scanning speed than the first scanning means scans a slow and horizontally In the retinal scanning image display device having the above, the light beam can be easily aligned with the pupil of the observer's eye M.

According to the third aspect of the present invention, the cross-sectional shape with respect to the plane orthogonal to the traveling direction of the light beam incident on the pupil of the eye of the observer is a shape whose width in the second scanning direction is larger than the width in the first scanning direction. By doing so, the light beam can be easily aligned with the pupil of the observer's eye in the second scanning direction.

According to the invention described in claim 1, between the first scanning means and the second scanning means, by which it is possible to enlarge the cross-sectional area of the light flux, easily align the light beam in the pupil of the viewer's eye can do.

According to the present invention, since the cross-sectional area of the light beam can be enlarged between the second scanning unit and the pupil, the light beam can be easily aligned with the pupil of the observer's eye.

According to the invention described in claim 4, the first lens having a positive refractive power toward the second scanning direction and the second lens having a negative refractive power toward the second scanning direction. By the combination, the cross-sectional area of the light beam incident on the pupil of the observer's eye can be enlarged.

According to the fifth aspect of the present invention, the cross-sectional area of the light beam incident on the pupil of the observer's eye can be enlarged by the cylindrical lens.

According to the present invention, the cross-sectional shape with respect to the plane perpendicular to the traveling direction of the light beam incident on the pupil of the observer's eye is made larger in the pupil of the observer's eye by making the horizontal width larger than the vertical width. The incident light beam can be easily aligned with the pupil in the horizontal direction.

  FIG. 1 is a block diagram showing a first embodiment of a retinal scanning image display device 1. As shown in FIG. 1, the retinal scanning image display device 1 includes a light beam output unit 2 and a scanning unit 3, and the scanning unit 3 outputs a light beam K output from the light beam output unit 2 to the pupil M 1 of the eye M of the observer. Is a retinal scanning image display device that displays an image on the retina M2 of the eye M of the observer by scanning through the retina M2. The retinal scanning image display device 1 is characterized in that it further includes a light beam cross-section enlarging means 4. The light beam cross-section enlarging means 4 is an optical device that expands the horizontal width of the light flux K incident on the retina M2 of the eye M of the observer more than the horizontal width of the light flux K incident on the scanning means 3. The horizontal direction corresponds to the left-right direction of the eye, and the vertical direction corresponds to the up-down direction of the eye.

  Next, a specific configuration of the light beam output unit 2 will be described. The luminous flux output unit 2 includes a video signal supply circuit 5 to which a video signal G from an external device is input, a red light source 6, a green light source 7, a blue light source 8, a red light source driver 9, a green light source driver 10, and a blue light source driver. 11, collimating lenses 12, 13, 14, wavelength selective mirrors 15, 16, 17, and a focus lens 18. Then, the video signal supply circuit 5 is based on the image signal G supplied from an external device, and the red light source driver 9, the green light source driver 10, and the blue light source driver that respectively drive the red light source 6, the green light source 7, and the blue light source 8. 11 outputs an intensity modulation signal. Light emitted from the red light source 6, the green light source 7, and the blue light source 8 is formed into a substantially parallel light beam by the collimator lenses 12, 13, and 14 and then combined by the wavelength selective mirrors 15, 16, and 17. The light is incident on the optical fiber 19 by the focus lens 18 and transmitted to the scanning means 3.

  Next, the above-described scanning means 3 will be described with reference to FIGS. The scanning unit 3 includes a first scanning unit 20, a second scanning unit 21, and convex lenses 22 and 23 as relay optical systems. The first scanning means 20 is an optical device that performs a high-speed scanning operation in the first scanning direction. The second scanning unit 21 is an optical device that performs a scanning operation at a lower speed than the first scanning unit 26 in a second scanning direction orthogonal to the first scanning direction. For example, the first scanning direction corresponds to the vertical direction, and the second scanning direction corresponds to the horizontal direction. The first scanning means 20 receives the first synchronization signal V from the first synchronization signal output section 24 of the light beam output section 2 and performs a scanning operation in the first scanning direction in synchronization with the first synchronization signal V. is there. The second scanning means 21 receives the second synchronization signal H from the second synchronization signal output section 25 of the light beam output section 2, and performs a scanning operation in the second scanning direction in synchronization with the second synchronization signal H. Is.

  The first scanning means 20 is rotatably provided by a rotating shaft. The first scanning unit 20 reflects the light beam K in a direction corresponding to the rotational position. The convex lenses 22 and 23 concentrate the light beam K scanned by the first scanning unit 20 on the second scanning unit 21.

  The second scanning means 21 is rotatably provided by a rotation shaft. The second scanning means 21 reflects the light beam K in a direction corresponding to the rotational position. The second scanning means 21 is provided so as to be swingable about the rotation axis. The second scanning unit 21 reflects the light beam K that has passed through the convex lenses 22 and 23 in a direction corresponding to the rotational position of the second scanning unit 21.

  FIG. 2 shows a state of the light beam K in a process in which the light beam K passes through the scanning means 3 and the light beam cross-section enlarging means 4 and enters the observer's eye M. FIG. It is a figure which shows the state which looked at the state which injects into the eye M from the horizontal direction. FIG. 2B is a diagram showing a state in which the light beam K is incident on the eye M of the observer as viewed from above. In this figure, the broken line represents the optical axis of the scanned light beam K, and the straight line represents the beam width of the light beam K passing through the scanning center, that is, the outer diameter.

  As shown in FIG. 2A, the vertical width of the light beam K incident on the scanning means 3 in the vertical section is a, and the vertical width of the light beam K incident on the observer's eye M in the vertical section. The width is a. On the other hand, as shown in FIG. 2B, the horizontal width of the horizontal cross section of the light beam K incident on the scanning means 3 is a, and the horizontal cross section of the light beam K incident on the eye M of the observer. And the horizontal width b of the horizontal cross section of the light beam K incident on the observer's eye M is horizontal in the horizontal cross section of the light beam K incident on the scanning means 3. A state in which the width is larger than the width a in the direction is shown.

  As shown in FIG. 1, the cross-sectional shape with respect to the plane perpendicular to the traveling direction of the light beam K incident on the observer's eye M is thus made larger in the horizontal direction than in the vertical direction. The cross-sectional shape with respect to the plane orthogonal to the traveling direction of the light beam K can be made into an approximately elliptical shape. In other words, the cross-sectional shape with respect to the plane orthogonal to the traveling direction of the light flux K is made larger in the width in the left-right direction of the eye than in the vertical direction of the eye.

  Next, based on FIG.1 and FIG.2, the specific structure of the said light beam cross-section expansion means 4 is demonstrated. The beam cross-section enlarging means 4 includes two convex lenses 27 and 28 constituting a relay optical system 26 provided between the scanning means 3 and the observer's eye M, and a first stage disposed in front of the convex lens 27. Lens 29 and a second lens 30 arranged in front of the convex lens 28.

  The first lens 29 does not have the function of refracting the light beam K in the vertical direction as shown in FIG. 2 (a), but the light beam K in the horizontal direction as shown in FIG. 2 (b). It is a lens having an action of refracting in the negative direction. The second lens 30 does not have the function of refracting the light beam K in the vertical direction as shown in FIG. 2 (a), but the light beam in the horizontal direction as shown in FIG. 2 (b). It is a lens having an action of refracting K in the positive direction. Here, the negative refractive power means a refractive power for condensing the width of the light beam K. Further, the positive refractive power means a refractive power that diffuses the width of the light beam K.

  The first lens 29 and the second lens 30 can be constituted by cylindrical lenses. When the first lens 29 and the second lens 30 are constituted by cylindrical lenses, the side surface of the first lens 29 is surrounded by a convex cylindrical surface 29a and a flat surface 29b as shown in FIG. It is. Further, as shown in FIG. 1, the side surface of the second lens 30 has a shape surrounded by a flat surface 30a and a concave cylindrical surface 30b. The upper and lower surfaces of the first lens 29 and the second lens 30 are flat. The first lens 29 is disposed in front of the convex lens 27 in such a manner that the axial center of the cylindrical surface 29a is oriented in the vertical direction, the light beam K is incident from the cylindrical surface 29a, and the light beam K is emitted from the flat surface 29b. ing. The second lens 30 is disposed in front of the convex lens 28 in such a manner that the axial center of the cylindrical surface 30b is oriented in the vertical direction, the light beam K is incident from the flat surface 30a, and the light beam K is emitted from the cylindrical surface 30b. ing. Since the first and second lenses 29 and 30 are arranged in this manner, the cylindrical surfaces 29a and 30b are curved in the horizontal direction as shown in FIG. Is refracted in the horizontal direction. However, as shown in FIG. 2 (a), the cylindrical surfaces 29a and 30b are not curved in the vertical direction, so that the light flux K is not refracted in the vertical direction.

  Next, the focal position when the first lens 29 and the convex lens 27 are viewed as one optical lens, and the focal position when the second lens 30 and the convex lens 28 are viewed as one optical lens. The relationship with the position will be described.

  In the state shown in FIG. 2A, the focal position f1 when the first lens 29 and the convex lens 27 are viewed as one optical lens, and the second lens 30 and the convex lens 28 are optically aligned. The focal positions of the convex lenses 27 and 28 are adjusted so that the focal positions f1 when viewed as two lenses coincide with each other. Here, since the first and second lenses 29 and 30 do not have the function of refracting the light beam K in the vertical direction (the state shown in FIG. 2 (a)), the focal position f1 is substantially equal. This is the focal position f1 of the convex lenses 27 and 28. Accordingly, the parallel luminous flux K passes through the first lens 29 and the convex lens 27, once converges to the focal position f1, proceeds again while diffusing, and then passes through the second lens 30 and the convex lens 28. Thus, a parallel light beam K can be made incident on the eye M of the observer.

  Further, in the state shown in FIG. 2B, the focal position f2 when the first lens 29 and the convex lens 27 are viewed as one optical lens, and the second lens 30 and the convex lens 28 are optically connected. The curvatures of the cylindrical surfaces 29a and 30b of the first and second lenses 29 and 30 are determined so that the focal positions f2 when viewed as one of the lenses coincide with each other. In addition, the first and second lenses 29, 29 are arranged so that the focal position f2 shown in FIG. 2B is closer to the convex lens 27 than the focal position f1 shown in FIG. The curvature of 30 cylindrical surfaces 29a and 30b is determined.

  By setting the focal position f2 shown in FIG. 2B closer to the convex lens 27 side than the focal position f1 shown in FIG. The cross sectional area is enlarged in the horizontal direction shown in FIG. That is, the parallel light beam K passes through the first lens 29 and the convex lens 27 and once converges on the focal position f2, and then travels while diffusing again. Since the distance between them is wider than in the state shown in FIG. 2 (a), as shown in FIG. 2 (b), the light beam K travels while expanding its width, and the width of the light beam K is as shown in FIG. The light is incident on the second lens 30 in a state that is larger than the state shown in (a), and passes through the second lens 30 and the convex lens 28 to become a parallel light beam K and enters the eye M of the observer. In this way, the light beam K can be incident on the eye M of the observer in a state where the width is expanded in the horizontal direction shown in FIG. 2 (B) than in the vertical direction shown in FIG. 2 (A). It is.

  Next, in the retinal scanning image display apparatus 1 configured as described above, a case where the light flux K is aligned with the pupil of the observer's eye M will be described with reference to FIGS. As shown by the solid line in FIG. 2, the parallel light beam K output from the light beam output unit 2 is the optical axis of the first scanning means 20, convex lenses 22, 23, second scanning means 21, and light beam cross-section expanding means 4. A case where the light travels in line with L and enters the eye M of the observer will be described. First, the width of the light beam K in the vertical direction will be described with reference to FIG.

  As shown by the solid line in FIG. 2 (a), the parallel light beam K having a width in the vertical direction and the sailor direction is scanned in the vertical direction by the first scanning means 20, and then passes through the convex lenses 22 and 23. The light enters the second scanning means 21 and is scanned in the horizontal direction. The light beam K emitted from the second scanning means 21 passes through the first lens 29 and then refracts in the focusing direction, that is, in the negative direction when passing through the convex lens 27, and is once focused at the focal position f1. Later, it diffuses again and passes through the second lens 30. After that, when passing through the convex lens 28, it becomes a parallel light beam K and enters the eye M of the observer. Incidentally, since the first and second lenses 29 and 30 are not curved in the vertical direction, the light beam K is not refracted when passing through the first and second lenses 29 and 30. Accordingly, in this way, in the vertical direction, the width of the light beam K incident on the observer's eye M is the same as the width of the light beam K incident on the scanning means 3.

  Next, a change in the width of the light beam K in the horizontal direction will be described with reference to FIG. As shown by the solid line in FIG. 2 (b), the parallel light beam K having vertical and horizontal diameters a is scanned in the vertical direction by the first scanning means 20, and then passes through the convex lenses 22 and 23. The light enters the second scanning means 21 and is scanned in the horizontal direction. The light beam K emitted from the second scanning means 21 is refracted in the focusing direction when passing through the first lens 29, and further refracted in the focusing direction when passing through the convex lens 27, and once at the focal position f2. Focus. The focal position f2 is present at a position closer to the convex lens 27 in the direction of the focal position f1 shown in FIG. That is, in the state shown in FIG. 2 (b), the distance from the focal position f2 to the second lens 30 is further separated compared to the state shown in FIG. 2 (a). The once converged light beam K thus enters the second lens 30 with its cross-sectional area further enlarged while traveling a further distance. Then, when the light beam K passes through the second lens 30 and enters the convex lens 28, the light beam K enters the convex lens 28 as if it has diffused from the focal position of the convex lens 28. K passes through the convex lens 28 and enters the observer's eye M as a parallel light beam K.

  As described above, since the width of the light beam K incident on the observer's eye M is larger than the width of the light beam K incident on the scanning unit 3 in the horizontal direction, the light beam K is applied to the observer's eye M. It can be easily aligned. In particular, the position of the observer's eye M is likely to be displaced in the horizontal direction compared to the vertical direction. Therefore, by expanding the width of the light beam K in the horizontal direction, the light beam K can be easily aligned with the position of the eye M of the observer. Furthermore, since the width of the light beam K is enlarged in the subsequent stage of the scanning unit 3, the scanning unit 3 does not scan the light beam K in a state where the width is expanded. For this reason, since it is not necessary to increase the size of the scanning unit 3 so that the scanning unit 3 can scan the light flux K having an increased width, the moment of inertia of the scanning unit 3 does not increase, and even at a high scanning speed. The load will not increase.

  As described above, after the light beam K is aligned with the pupil of the eye M of the observer, the first light scanning unit 20 and the second scanning unit 21 scan the light beam K within the range indicated by the dotted line in FIG. Thus, an image is displayed on the retina of the eye M of the observer. In the first embodiment configured as described above, as shown in FIG. 2B, the angle of view β is smaller than the swing angle α, so the angle of view before the width of the light flux K is expanded. In order to obtain β, it is necessary to increase the swing angle α of the scanning means 3.

  FIG. 3 shows a second embodiment. The feature of this second embodiment is that the light beam cross-section expanding means 4 is disposed between the convex lens 23 of the relay optical system and the second scanning means 21. The light beam section enlarging means 4 is composed of a first lens 40 and a second lens 41. The first lens 40 has a positive refractive power in the horizontal direction shown in FIG. 3B, but does not have a refractive power in the vertical direction shown in FIG. The second lens 41 has a negative refractive power in the horizontal direction shown in FIG. 3B, but does not have a refractive power in the vertical direction shown in FIG. These first and second lenses 40 and 41 can be constituted by cylindrical lenses. Thus, when these 1st, 2nd lenses 40 and 41 are comprised by the cylindrical lens, the 1st lens 40 is comprised by the concave cylindrical surface 40a and the plane 40b. The second lens 41 includes a flat surface 41a and a convex cylindrical surface 41b. The first lens 40 has the cylindrical lens surface 40a oriented in the vertical direction, the light beam K is incident from the cylindrical surface 40a, and the light beam K is emitted from the flat surface 40b. Is arranged. Further, the second lens 41 is arranged in front of the second scanning means 21 in such a manner that the axial center of the cylindrical surface 41b is oriented in the vertical direction, the light beam K is incident from the plane 41a, and the light beam K is emitted from the cylindrical surface 41b. Is arranged. Here, the first and second lenses 40 and 41 have the same focal position f3.

  By arranging the first and second lenses 40 and 41 in this way, as shown in FIG. 3 (b), the first and second lenses 40 and 41 are bent in the horizontal direction, so that the light beam K is refracted in the horizontal direction. However, since the vertical direction is not curved as shown in FIG. 3 (a), the light flux K is not refracted in the vertical direction.

  Next, the operation will be described. In the vertical direction shown in FIG. 3A, the light beam cross-section enlarging means 4 does not have an action of refracting the light beam K, so that the focal position f1 is substantially the focal position of the convex lens 23. Therefore, the light beam K that has become parallel by passing through the convex lens 23 passes through the first and second lenses 40 and 41 as they are and enters the second scanning means 21.

  Further, in the state shown in FIG. 3B, the light beam K that has become parallel by passing through the convex lens 23 is diffused so as to be emitted from the focal position f3 when passing through the first lens 40. The light enters the second lens 41. Then, as emitted from the focal position f3, the light beam K incident on the second lens 41 passes through the second lens 41, becomes a parallel light beam K, and enters the second scanning means 21. .

    Since the expanded light beam K is incident on the second scanning unit 21 as described above, the second scanning unit 21 needs to be enlarged so that the expanded light beam K can be scanned in the horizontal direction. It is. For this reason, there is a possibility that the inertia of the second scanning means 21 is increased and the responsiveness of the scanning operation in the second scanning direction is deteriorated. However, since the second scanning means 21 originally has a characteristic that the scanning speed is relatively slow, as described above, there is no possibility that the image display is deteriorated due to the scanning operation in the second scanning direction even if the second scanning means 21 is enlarged. . In this configuration, the swing angle of the second scanning unit 21 and the angle of view are equal, and therefore it is not necessary to set the swing angle of the second scanning unit 21 to be large.

  FIG. 4 shows a third embodiment. In the third embodiment, the light beam cross-section enlarging means 4 is that a lens 50 is disposed in front of the convex lens 23 constituting the relay optical system. The lens 50 is a lens having no refractive power in the vertical direction as shown in FIG. 4 (a), but having a positive refractive power in the horizontal direction as shown in FIG. 4 (b). . The lens 50 can be constituted by, for example, a cylindrical lens. When the lens 50 is constituted by a cylindrical lens, the lens 50 has a shape surrounded by a flat surface 50a and a concave cylindrical surface 50b, as shown in FIG. The lens 50 is arranged such that the axial center of the cylindrical surface 50b is oriented in the vertical direction, the light beam K is incident from the flat surface 50a, and the light beam K is emitted from the cylindrical surface 50b. Since the lens 50 is arranged in this manner, the cylindrical surface 50b is curved in the horizontal direction, and thus the light beam K is bent in the horizontal direction. However, since the cylindrical surface 50b is not curved in the vertical direction, the light beam K is not refracted in the vertical direction.

  Even in this configuration, the light beam K is incident on the convex lens 23 in the state where the width of the lens 50 is enlarged. After the light beam K becomes a parallel light beam K in the convex lens 23, the second scanning means 21 performs the second scanning. It is scanned in the direction.

  In the above description, the axial centers of the cylindrical surfaces 29a, 30b, 40a, 41b, 50b of the cylindrical lenses constituting the first lens 29, 40, the second lens 30, 41, or the lens 50 are oriented in the vertical direction. Although the width of the light beam K is expanded in the horizontal direction by directing it, the axis of the cylindrical surfaces 29a, 30b, 40a, 41b, 50b of the cylindrical lens is directed in an arbitrary direction, and is orthogonal to the direction. The width of the luminous flux K can be expanded in the direction of the movement.

FIG. 1 is a block diagram of a retinal scanning image display device. (First embodiment) FIG. 2 is a diagram showing a state in which the width of the light beam is enlarged. (First embodiment) FIG. 3 is a diagram showing a state in which the width of the light beam is enlarged. (Second Embodiment) FIG. 4 is a diagram showing a state in which the width of the light beam is enlarged. (Third embodiment) FIG. 5 is a block diagram of the retinal scanning image display device. (Conventional technology)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Retina scanning image display apparatus 2 Light beam output part 3 Scanning means 4 Light beam cross-section expansion means 20 First scanning means 21 Second scanning means 29 First lens (cylindrical lens)
30 Second lens (cylindrical lens)
40 First lens (cylindrical lens)
41 Second lens (cylindrical lens)
50 lenses (cylindrical lenses)
K luminous flux M eye M1 pupil M2 retina

Claims (5)

A retinal scanning image display device that displays an image on an observer's retina by including a light beam output unit that outputs a light beam and a scanning unit that scans the retina with the light beam,
A light beam cross-sectional enlargement unit that enlarges a cross-sectional area of a light beam incident on the pupil of the observer than a cross-sectional area of a light beam incident on the scanning unit;
A first scanning unit that scans the incident light beam in the first scanning direction; and a second scanning direction that has a lower scanning speed than the first scanning unit and intersects the first scanning direction. And second scanning means for scanning to
The first scanning direction of the first scanning means is a vertical direction corresponding to the vertical direction of the observer's eye , and the second scanning direction of the second scanning means corresponds to the horizontal direction of the observer's eye. Horizontal,
The first scanning means is provided in front of the second scanning means, and the light beam cross-sectional enlargement means is provided between the first scanning means and the second scanning means. Display device. 2. The retinal scanning image display device according to claim 1, wherein the light beam cross-sectional enlargement unit enlarges the cross-sectional shape of the light beam incident on the pupil at least in the horizontal direction. The light beam cross-sectional enlargement unit has a cross-sectional shape with respect to a plane orthogonal to the traveling direction of the light beam incident on the pupil, the width of the second scanning unit in the second scanning direction rather than the width of the first scanning unit in the first scanning direction. The retinal scanning image display device according to claim 1, wherein the retinal scanning image display device has a large shape. The light beam cross-section enlarging means is provided at the rear stage of the first lens having a positive refractive power toward the second scanning direction of the second scanning means, and the first lens of the second scanning means. The retinal scanning image display device according to any one of claims 1 to 3 , wherein the retinal scanning image display device is configured by a pair with a second lens having negative refractive power in two scanning directions. The retinal scanning image display apparatus according to claim 4 , wherein the first lens and the second lens are configured by a cylindrical lens.

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