JP2004061804A - Image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a glasses attachment type image display device which allows positions of optical pupils to be easily controlled to user's eyes. <P>SOLUTION: An image display device (1) is constituted of transparent plates (10L and 10R), an enclosure (20) for storing a liquid crystal display device therein, an attachment part (30), balancers (40L and 40R), and a hologram (11) being an eyepiece optical system provided in the center part of the transparent plate (10R). Light from the liquid crystal display device is made to go in the transparent plate (10R) and is guided to the hologram (11), and a magnified virtual image is provided by the hologram. The attachment part (30) is constituted of a spring member (31) like a coil and an enclosure (32) and a bridge of glasses is locked in such state that the bridge is held from forward and backward. A number of degrees of freedom is given to a locked position of the bridge in the attachment part (30) so that positions of optical pupils can be controlled. A centroid of the device is placed more backward than nose pads of glasses by balancers (40L and 40R) to enhance stability at the time of use. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an image display device attached to a user's glasses and used in front of the user.
[0002]
[Prior art]
2. Description of the Related Art There has been proposed an image display device which is attached to a user's glasses and provides an image in front of the eyes. Such an image display device generally includes a display unit that displays an image, and an eyepiece optical system that guides light from the display unit to the eye to provide a virtual image of the image, and is enlarged by the eyepiece optical system. By providing a virtual image, reduction in size and weight has been achieved so as to be suitable for attachment to eyeglasses.
[0003]
There are several proposals for a configuration for attaching to glasses. For example, U.S. Pat. No. 4,753,514 discloses a configuration in which a drive unit for driving a display unit is attached to a temple of glasses, and the display unit and the eyepiece optical system are supported by the drive unit by an arm and positioned in front of the eyes. U.S. Pat. No. 6,033,372 discloses a configuration in which a display unit and a drive unit are attached to a temple of glasses, and an eyepiece optical system is fixed to the display unit and positioned in front of the eyes.
[0004]
In JP-A-4-23580, the entire apparatus is mounted from the vine to the lens so that the display unit and the eyepiece optical system are located in front of the eyes. Further, Japanese Patent Application Laid-Open No. 2000-112396 discloses a configuration in which the eyepiece optical system is located in front of the eye and the display unit is located below the eyeglass lens with the lower part of the lens of the eyeglasses sandwiched from front and rear.
[0005]
[Problems to be solved by the invention]
In any of the image display devices, if the position of the optical pupil of the device and the position of the user's eyes do not match in the left-right direction and the up-down direction, the image observed by the user will lack.
[0006]
However, in the configurations of U.S. Pat. No. 4,753,514, U.S. Pat. No. 6,023,372, and JP-A-4-23580, the positions of the display unit and the eyepiece optical system cannot be moved in the left-right direction or the up-down direction. The position of the optical pupil easily shifts. In addition, there is a considerable distance from the vine of the glasses to which the device is attached to the position immediately before the eye on which the eyepiece optical system is to be arranged, and the distance greatly differs for each user (glasses). For this reason, unless the optical pupil is made extremely large, the device cannot be adapted to many users.
[0007]
However, if the optical pupil is to be enlarged, the size of the eyepiece optical system increases, and the size and weight of the entire apparatus also increase. This is not preferable for a mode used by attaching to eyeglasses.
[0008]
On the other hand, in the configuration of JP-A-2000-112396, it is possible to adjust the position of the optical pupil of the apparatus with respect to the position of the observer's eye. However, the size of the lens of the eyeglasses varies, and it is difficult to adjust the eyepiece optical system so that the eyepiece optical system is located immediately in front of the eye for both large and small lenses in the vertical direction. Therefore, it is necessary to enlarge the optical pupil, which leads to an increase in size and weight of the apparatus.
[0009]
Further, in the conventional video display device, no particular consideration is given to the weight balance. For this reason, the balance of the glasses to which the device is attached is poor, and the glasses cannot be used comfortably, and the relative position between the optical pupil and the user's eye is likely to shift.
[0010]
The present invention has been made in view of such a problem, and is an image display device attached to eyeglasses, in which adjustment of a position with respect to a user's eye is easy, and therefore, it is necessary to make an optical pupil too large. It is an object of the present invention to provide a compact and lightweight one that is easy to reduce. It is another object of the present invention to provide an image display device that has a good weight balance, is less likely to cause discomfort to the user even when used for a long time, and has a small shift of the optical pupil with respect to the user's eyes.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention, a video display device attached to spectacles, a display unit that displays a video, an eyepiece optical system that provides a viewer with a virtual image of the video displayed by the display unit, And a mounting portion locked to the bridge.
[0012]
This video display device is attached to spectacles by locking a mounting portion to a bridge connecting left and right lenses. The distance from the bridge to the position immediately before the eye on which the eyepiece optical system is arranged is short, and there is no great difference for each eyeglass of the user. Therefore, even if the optical pupil is not particularly large, eyes of many users are unlikely to deviate from the optical pupil, and it is possible to provide an image without any omission.
[0013]
In order to achieve the above object, the present invention also provides an image display device attached to eyeglasses, a display unit that displays an image, an eyepiece optical system that provides a viewer with a virtual image of the image displayed by the display unit, and eyeglasses. And a balancer that positions the center of gravity of the entire apparatus behind the nose pad of the glasses.
[0014]
In general, the spectacles have a heavy front portion having a lens, and therefore have poor balance and are easy to move. When the image display device is attached to the image display device, the eyepiece optical system is located near the front portion, so that the balance tends to be further deteriorated. However, by equipping the device with a balancer and positioning the center of gravity of the entire device behind the nose pad, it is possible to prevent the balance from deteriorating or to improve the balance.
[0015]
In the present invention, the image display device attached to the eyeglasses, a display unit that displays an image, an eyepiece optical system that provides a viewer with a virtual image of the image displayed by the display unit, and a mounting unit that is locked by the eyeglasses. And an operation unit for applying a pinching force from above and below to release the locking of the mounting unit.
[0016]
This video display device can be removed from the glasses simply by the user sandwiching the operation unit from above and below. Conversely, it is possible to attach the mounting portion to the eyeglasses simply by positioning the mounting portion at the locking portion of the eyeglasses with the operation portion interposed therebetween and stopping the operation portion from being interposed. Therefore, attachment and detachment to the eyeglasses is extremely easy, and the user can remove or attach the eyeglasses with one hand while wearing the eyeglasses.
[0017]
According to the present invention, the image display device attached to the glasses further includes a display unit for displaying an image, an eyepiece optical system including a volume phase hologram for providing a viewer with a virtual image of the image displayed by the display unit, and a display unit. A transparent light guide that reflects light from the inside to guide the light to the eyepiece optical system, and a mounting portion that is locked by the eyeglasses.
[0018]
The volume phase hologram can transmit light from the outside while having a function as an eyepiece optical system. Therefore, this image display device converts a virtual image of an image displayed by the display unit into an image of the outside world. Can be provided repeatedly. In addition, the light guide that guides light representing an image from the display unit to the eyepiece optical system is also transparent and can transmit light from the outside world, so that an image of the outside world can be provided without any omission. It is possible. Furthermore, it is possible to make the eyepiece optical system and the light guide part thinner, so that the device is thin and light in the front-rear direction and is in a form suitable for use by attaching to eyeglasses.
[0019]
It is preferable that each of the above-described image display devices has a configuration in which at least one of the left-right direction and the up-down direction has a degree of freedom in the locking position of the mounting portion in the glasses. With this configuration, it is possible to adjust the position of the optical pupil with respect to the user's eye by changing the position at which the mounting portion is locked, so that many users can use the optical pupil without increasing the optical pupil. Device.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a video display device 1 according to the first embodiment. In FIG. 1, (a) is a plan view as viewed from above, (b) is a front view as viewed from front, and (c) is a side view as viewed from the right, which is partially transparently represented.
[0021]
The video display device 1 includes a pair of left and right transparent plates 10L and 10R, a housing 20, a mounting unit 30, a pair of right and left balancers 40L and 40R, and a cable 50, and is used by being attached to the user's glasses. You. FIG. 2 shows the image display device 1 attached to eyeglasses. When attached to the glasses 80, the transparent plates 10L and 10R are located immediately before the left and right lenses 81L and 81R of the glasses 80, respectively.
[0022]
The housing 20 houses an optical system related to the provision of an image, and is fixed to the upper edge of the transparent plate 10R. The mounting portion 30 is fixed to the left and right transparent plates 10L and 10R to connect the two, and is used for mounting to the glasses 80. The image display device 1 is attached to the spectacles 80 by locking the attachment unit 30 to the bridge 83.
[0023]
The balancers 40L, 40R are fixed to the transparent plates 10L, 10R, respectively, and their weight positions the center of gravity of the entire image display device 1 behind the nose pad 86 of the glasses 80. The balancers 40L and 40R have hinges 41 near the transparent plates 10L and 10R, and the image display device 1 has an open state where the balancers 40L and 40R are substantially perpendicular to the transparent plates 10L and 10R. It can be in a closed state that is substantially parallel. The image display device 1 is attached to the glasses 80 in an open state. In the image display device 1 attached to the glasses 80, the balancers 40 </ b> L and 40 </ b> R abut against the left and right temporal regions of the user, and are supported by the bridge 83 of the spectacles 80 and the temporal region of the user.
[0024]
The cable 50 is connected to the housing 20, and supplies power, a video signal, and a control signal from a control unit (not shown) to a display unit in the housing 20. Note that the cable 50 is attached to the balancer 40R by the holding member 51, and does not slack near the transparent plate 10R or the housing 20.
[0025]
FIG. 3 shows an optical system for providing an image of the image display device 1. FIG. 3 shows a cross section of the housing 20 and the transparent plate 10R. The housing 20 houses a light emitting diode 71, a convex lens 72, and a transmissive liquid crystal display 73 as a display unit. The light emitting diode 71 emits illumination light for illuminating the liquid crystal display 73. The liquid crystal display 73 displays an image on the liquid crystal layer according to an image signal given via a cable, and modulates the illumination light from the light emitting diode 71 with the image light representing the image displayed by being modulated by the liquid crystal layer. I do. The lens 72 guides the illumination light from the light emitting diode 71 to the liquid crystal display 73 as substantially parallel light.
[0026]
The upper edge of the transparent plate 10R has a wedge-shaped cross section, and image light from the liquid crystal display 73 passes through the end face and enters the transparent plate 10R. Light that has entered the transparent plate 10R is totally reflected by the two opposing surfaces and travels downward. At the center of the transparent plate 10R, a volume phase type hologram 11 is provided as an eyepiece optical system. The hologram 11 is provided at a position facing the right eye of the user so as to be inclined so that the lower part approaches the right eye.
[0027]
The light traveling in the transparent plate 10R is diffracted and reflected by the hologram 11, exits from the surface of the transparent plate 10R on the user side, passes through the lens 81R of the glasses 80, and reaches the user's eyes. The hologram 11 is set to provide an enlarged virtual image several times larger than the image displayed by the liquid crystal display 73 at a position several tens of cm to several meters from the right eye of the user. The optical pupil P has a size of 6 mm left and right and 2 mm vertically. By using a small optical pupil in the vertical direction in this way, it is possible to make the transparent plate 10R thin and lightweight.
[0028]
The hologram 11 is set so as to hardly affect light having a wavelength different from the wavelength of the image light, and almost all light from the outside passes through the hologram 11 and reaches the right eye of the user. Therefore, the image display device 1 provides the image displayed on the liquid crystal display 73 so as to overlap the image of the outside world. The transparent plate 10R also transmits light from the outside. Therefore, the image of the outside world provided to the user is not chipped. It should be noted that when transmitted through the inclined hologram 11, refraction occurs in the light from the outside. The refraction can be corrected by the transparent plate 10R which is in close contact with the hologram 11, so that no distortion occurs in the image of the outside. .
[0029]
As the light emitting diode 71, three kinds of light emitting light having wavelengths of 630 nm, 520 nm, and 465 nm are used. The liquid crystal display 73 is controlled so as to repeatedly display the red component, the green component, and the blue component of the image in order, and the light emitting diode 71 supplies illumination light corresponding to the color component of the image displayed by the liquid crystal display 73. The emission is controlled so that That is, the image display device 1 provides a color image by time division display.
[0030]
FIG. 4 shows the relationship between the wavelength of light and the transmittance and reflectance of the hologram 11. The hologram 11 is set so that the reflectance becomes the maximum (about 100%) at the above three wavelengths, and the width of the wavelength corresponding to the half value of the maximum reflectance becomes about 20 nm. Therefore, the image light is efficiently diffracted and reflected to provide a bright image, and light from the outside is transmitted except for those having wavelengths very close to the above three wavelengths, thereby providing an image of the outside with a natural hue. . In addition, it is also possible to provide a monochromatic image by providing only one light emitting diode 71 that emits light of a single wavelength. Also in that case, the half width of the reflectance of the hologram 11 is preferably set to about 20 nm.
[0031]
The transparent plate 10R that guides the image light to the hologram 11 by total reflection can have a thickness of about 3 mm or less. Therefore, it is thin and lightweight.
[0032]
As described above, the size of the optical pupil P may be about 6 mm on the left and right and about 2 mm on the up and down. If the optical pupil P is of this size, the image can be clearly observed even through the lens 81R of the normal glasses 80 for correcting myopia and hyperopia. In addition, if the optical pupil P is set to such a size, it is possible to provide various users with images without any missing parts due to the characteristics of the mounting unit 30 described below.
[0033]
The mounting part 30 is shown in FIG. 5A is a front view as viewed from the front, and FIG. 5B is a side sectional view as viewed from the right. The mounting portion 30 includes a spring member 31 formed by bending a metal having elasticity into a coil shape, and a housing 32 that accommodates a part of the spring member 31 and connects the transparent plates 10L and 10R. Only the front part 31a of the spring member 31 is accommodated in the housing 32, and the rear part 31b and the upper part 31c connecting the front part 31a and the rear part 31b are located outside the housing 32.
[0034]
The surface of the rear portion 31b of the spring member 31 is covered with a resin or rubber 35 having flexibility and a high coefficient of friction, and the outer surface of the rear wall 32a of the housing 32 facing the rear portion 31b of the spring member 31 is formed of the same resin or resin. It is covered with rubber 36. The lower end of the front part 31 a of the spring member 31 is fixed inside the housing 32. However, the upper portion 31c is movable back and forth by the elasticity of the front portion 31a, and thereby the distance between the rear portion 31b and the housing 32 is variable. The width (length in the left-right direction) of the rear portion 31b of the spring member 31 is about several mm, and is smaller than the width of the bridge 83 of the general glasses 80. The height (length in the vertical direction) of the spring member 31 and the housing 32 is about 1 to 2 cm, which is larger than the height of the bridge 83 of the general glasses 80.
[0035]
An operation member 33 is fixed to an upper end of a rear portion 31b of the spring member 31. The operation member 33 is formed in a plate shape from rigid metal or resin, and is inclined so as to rise forward. When the housing 32 is fixed and the operation member 33 is pressed down from above, the rear portion 31b whose upper end is connected to the front portion 31a via the upper portion 31c is inclined in a direction in which the lower end is separated from the rear wall 32a of the housing 32. I do. The user uses this to attach the video display device 1 to the glasses 80.
[0036]
This is shown in FIG. As shown by arrows A and B, the user sandwiches the operation member 33 and the housing 32 from above and below, and keeps the lower end of the rear portion 31b of the spring member 31 far away from the rear wall 32a of the housing 32. Then, the bridge 83 of the glasses 80 is positioned between the rear portion 31b and the rear wall 32a to stop the operation member 33 and the housing 32 from being sandwiched. The rear wall 32a of the housing 32 and the rear portion 31b of the spring member 31 sandwich the bridge 83 from front and rear, and are locked to the bridge 83 by frictional force. FIG. 7 shows this state. When removing the video display device 1 from the glasses 80, the user only has to perform the reverse operation.
[0037]
As described above, the attachment / detachment of the video display device 1 to / from the glasses 80 is extremely easy, and can be performed with two fingers of one hand. In addition, the user can attach and detach the video display device 1 while wearing the glasses 80. The image display device 1 can be attached to eyeglasses 80 having different thicknesses (length in the front-rear direction) of the bridge 83. This is shown in FIG. In FIG. 8, a thick line represents the spring member 31 when attached to a thin (for example, 1.5 mm) bridge 83, and a thin line represents the spring member 31 when attached to a thick (for example, 4.5 mm) bridge 83.
[0038]
As described above, the width of the rear part 31b of the spring member 31 is smaller than the width of the bridge 83 of the normal glasses 80, and the height of the rear part 31b is larger than the height of the bridge 83 of the glasses 80. Therefore, the locking position of the mounting portion 30 in the bridge 83 has a degree of freedom in the left-right direction and the up-down direction, and the relative position of the video display device 1 with respect to the glasses 80 can be adjusted within the range of the degree of freedom. . Although the width of the left and right eyes varies depending on the user, the distance from the bridge 80 to the eyes of the user is about half of the width of the left and right eyes and does not vary greatly depending on the user. The optical pupil P of the image display device 1 can be located immediately before.
[0039]
Further, regardless of the thickness of the bridge 83 of the spectacles 80, the distance between the lens 81R of the spectacles 80 and the transparent plate 10R is substantially constant, and therefore, the position of the optical pupil P in the front-back direction is also substantially constant. In the image display device 1, under these conditions, the size of the optical pupil P can be set to 6 mm on the left and right and 2 mm on the upper and lower sides, so that the size of the eyepiece optical system, which causes an increase in size and weight of the device, is avoided. Can be
[0040]
The weight balance of the image display device 1 will be described with reference to FIG. 9A is a plan view, and FIG. 9B is a side view. M is the weight of the image display device 1 excluding the cable 50, G is its center of gravity, Ma is the weight of all parts except the balancers 40L, 40R and the cable 50, Ga is its center of gravity, Mb is the weight of only the balancers 40L, 40R, Gb represents the center of gravity. La is the distance in the front-rear direction between the center of gravity Ga and the center of gravity G, Lb is the distance in the front-rear direction between the center of gravity Gb and the center of gravity G, la is the distance in the left-right direction between the center of gravity Ga and the center of gravity G, and lb is the center of gravity Gb and the center of gravity. It represents the distance in the left-right direction from G.
[0041]
In the front-back direction, Equations 1 and 2 hold, and Equation 2 gives Equation 3.
M = Ma + Mb Equation 1
Ma × La = Mb × Lb Equation 2
La = Lb × Mb / Ma Equation 3
[0042]
From Equation 3, it can be seen that if Lb is increased and Mb is increased, the entire center of gravity G moves rearward. The balancers 40L and 40R perform this function, and in the image display device 1, the entire center of gravity G is located behind the nose pad 86 of the glasses in the front-back direction. This prevents the center of gravity when the image display device 1 is attached from moving forward relative to the center of gravity of the glasses 80 alone, and the whole is stabilized. Note that increasing the weight Mb of the balancers 40L and 40R increases the total weight M. Therefore, it is preferable to lengthen the balancers 40L and 40R to increase Lb.
[0043]
Equations 4 and 5 hold for the left-right direction, and Equation 6 is obtained from Equation 5.
M = Ma + Mb Equation 4
Ma × la = Mb × lb Equation 5
la = lb × Mb / Ma Equation 6
[0044]
From Equation 6, it can be seen that if lb is increased and Mb is increased, the entire center of gravity G moves to the left. The balancers 40L and 40R also perform this function. In the video display device 1, the overall center of gravity G is set near the center in the left-right direction, while the housing 20 is provided only on the right transparent plate 10R. are doing. As a result, the balance in the left-right direction is well maintained, and the overall stability is further increased. In addition, it is possible to prevent the weight from being unevenly applied to one ear or the temporal region (here, the right side) of the user, so that the user can use the device comfortably. Note that the left and right balancers 40L and 40R can have the same weight. However, if the left balancer 40L is heavier than the right balancer 40, the center of gravity Gb is shifted from the left and right centers while keeping the sum of the weights constant. It can be separated (increase lb), which is preferable.
[0045]
Here, since the cable 50 can be supported by the right ear, the weight of the cable 50 is not taken into consideration. However, when the cable 50 is heavy, the weight and length of the balancers 40L and 40R are also taken into account in consideration of the weight. It is good to set. Also, when video signals and control signals are supplied wirelessly, it is not necessary to consider the weight of the cable.
[0046]
FIG. 10 shows an image display device 2 according to the second embodiment. 10A is a plan view seen from above, FIG. 10B is a front view seen from the front, and FIG. 10C is a side view seen from the right. The image display device 2 is obtained by omitting the left transparent plate 10L and the balancers 40L and 40R from the image display device 1 described above. The transparent plate 10R includes a second mounting portion 60 instead of the right balancer 40R. Has been fixed. The configuration of the mounting unit 30 for mounting on the bridge of the glasses 80 and the configuration of the optical system for providing an image are as described above.
[0047]
The mounting portion 60 is locked to the stalk 87R (see FIG. 2) of the spectacles 80. The mounting portion 60 is fixed to the transparent plate 10R by a fixing member 61, and supported by the fixing member 61, and has a left-right direction (x direction in FIG. 10A) and a front-rear direction (y direction in FIG. 10C). And a movable member 62 which can be moved. The moving member 62 has a U-shaped cross section, and is locked so as to sandwich the yoke 87R of the glasses 80 from front and rear.
[0048]
The fixed member 61 and the moving member 62 are engaged with each other by frictional force, and the relative position of the two does not change with a slight force. However, when a relatively large force is applied, the moving member 62 can be displaced in the left-right direction and the front-back direction with respect to the fixed member 61. Depending on the spectacles 80, the sizes of the lenses 81L and 81R greatly differ, and the heights (lengths in the up-down direction) and the positions in the front-rear direction of the straps 87L and 87R also differ. Compatible with glasses 80.
[0049]
In the image display device 2, although the balancers 40L and 40R sandwiching the user's head from both sides do not exist, the spectacles 80 are locked by locking the mounting portion 30 to the bridge 83 and locking the mounting portion 60 to the yoke 87. Can be attached stably. In addition, since the mounting unit 60 can move in the left-right direction and the up-down direction, and the mounting unit 30 can also move in the left-right direction and the up-down direction as described above, the position of the optical pupil P can be easily adjusted.
[0050]
FIG. 11 shows a video display device 3 according to the third embodiment. 11A is a plan view viewed from above, FIG. 11B is a front view viewed from the front, and FIG. 11C is a side view viewed from the right. The image display device 3 includes one transparent plate 10 corresponding to the two transparent plates 10L and 10R of the image display device 1 of the first embodiment, and omits the balancers 40L and 40R. The transparent plate 10 is a curved surface. Further, the mounting portion 30 that is locked to the bridge 83 is fixed to the left and right centers of the transparent plate 10.
[0051]
FIG. 12 shows a video display device 4 according to the fourth embodiment. 12, (a) is a plan view as viewed from above, (b) is a front view as viewed from the front, and (c) is a side view as viewed from the right. The image display device 4 is obtained by modifying the above-described image display device 3 and fixing mounting portions 30L and 30R having the same configuration as the mounting portion 30 to the left and right ends of the transparent plate 10. The mounting portions 30L and 30R are locked to the left and right stalks 87L and 87R of the glasses 80.
[0052]
In the image display device 4, the position of the optical pupil P can be adjusted in the same manner as in the image display device 1 of the first embodiment, depending on the locking positions of the mounting portions 30L and 30R. In addition, since it is attached to both ends of the spectacles 80, the stability is high and rotation and the like are reliably prevented.
[0053]
FIG. 13 shows a video display device 5 according to the fifth embodiment. 13A is a plan view as viewed from above, and FIG. 13B is a front view as viewed from the front. The image display device 5 is obtained by modifying the image display device 1 of the first embodiment, omitting one of the transparent plates 10L, and mounting the balancer 40L by an arm 52 having a shape along the upper edge of the lens 81L of the glasses 80. It is connected to the unit 30.
[0054]
FIG. 14 shows a video display device 6 according to the sixth embodiment. 14A is a plan view as viewed from above, and FIG. 14B is a front view as viewed from the front. The image display device 6 modifies the image display device 1 of the first embodiment to provide a configuration for providing an image to each of the left and right transparent plates 10L and 10R, and provides an image to both eyes. It is like that. That is, the image display device 6 is provided at the center of each of the two housings 20L and 20R housing the light emitting diode 71, the lens 72, and the liquid crystal display 73, and the left and right transparent plates 10L and 10R. Holograms 11L and 11R, and two cables 50L and 50R.
[0055]
The configuration of the mounting portion 30 that is locked to the bridge 83 of the glasses 80 is as described above. In the image display device 6, the position of the optical pupil P cannot be adjusted in the left-right direction. However, since the difference between the distance from the bridge 83 to the eyes for each user is small, the position of the optical pupil P is smaller than the first image display device 1. By making the pupil P slightly larger in the left-right direction, the device can be adapted to many users. In the vertical direction, the position of the optical pupil P can be adjusted at the position where the mounting portions 30L and 30R are locked, so that it is not necessary to enlarge the optical pupil P. Since the volume phase holograms 11L and 11R are used as the eyepiece optical system, it is easy to make the optical pupil P non-circular.
[0056]
【The invention's effect】
The image display device attached to the spectacles is, as in the present invention, a display unit that displays an image, an eyepiece optical system that provides a virtual image of the image displayed by the display unit to an observer, and is locked to a bridge of the spectacles. With the configuration including the mounting portion, many users' eyes are unlikely to deviate from the optical pupil without providing an especially large optical pupil, and it is possible to provide an image without any chipping, which is suitable for a usage mode. It becomes a small and lightweight device.
[0057]
An image display device attached to spectacles, as in the present invention, a display unit that displays an image, an eyepiece optical system that provides a viewer with a virtual image of the image displayed by the display unit, and a mounting unit that is locked to the spectacles If the balancer is provided with the center of gravity of the entire device located behind the nose pad of the glasses, the weight balance is improved, and the device and the glasses can be stably used. In addition, the observer's eyes are unlikely to deviate from the optical pupil of the device, and can always provide a picture without missing parts.
[0058]
Further, the image display device attached to the eyeglasses is, as in the present invention, a display unit for displaying an image, an eyepiece optical system for providing a viewer with a virtual image of the image displayed by the display unit, and is locked to the eyeglasses. With a configuration including the mounting portion and an operation portion that releases the locking of the mounting portion by applying a force to pinch the mounting portion from above and below, attachment and detachment to and from the glasses becomes extremely easy.
[0059]
Furthermore, an image display device attached to the glasses, as in the present invention, a display unit for displaying an image, and an eyepiece optical system including a volume phase hologram for providing a viewer with a virtual image of the image displayed by the display unit. A transparent light guide unit that internally reflects light from the display unit and guides the light to the eyepiece optical system, and a mounting unit that is locked to the eyeglasses. And it is possible to avoid the occurrence of chipping in the image of the outside world. Further, the device is thin and lightweight in the front-rear direction, and is in a form suitable for use by attaching to eyeglasses.
[0060]
When each of the image display devices of the present invention is configured to have a degree of freedom in the locking position of the mounting portion in the eyeglasses in at least one of the left-right direction and the up-down direction, the user can change the locking position of the mounting portion to change the user's position. It is possible to adjust the position of the optical pupil with respect to the other eye. Therefore, the device can be used by many users without increasing the optical pupil.
[Brief description of the drawings]
FIG. 1 is a plan view (a), a front view (b), and a side view (c) of an image display device according to a first embodiment.
FIG. 2 is a plan view showing a state in which the video display device according to the first embodiment is attached to eyeglasses.
FIG. 3 is a vertical sectional view of a housing and a transparent plate of the video display device according to the first embodiment.
FIG. 4 is a diagram schematically showing the relationship between the transmittance and the reflectance of a hologram constituting the eyepiece optical system according to the first embodiment and the wavelength.
FIGS. 5A and 5B are a front view (a) and a side sectional view (b) of a mounting portion of the video display device according to the first embodiment.
FIG. 6 is a vertical cross-sectional view of a mounting portion when the video display device according to the first embodiment is mounted on spectacles.
FIG. 7 is a vertical cross-sectional view of the mounting unit when the video display device according to the first embodiment is mounted on spectacles.
FIG. 8 is a longitudinal sectional view of a mounting portion when the video display device of the first embodiment is mounted on eyeglasses having different bridge thicknesses.
FIGS. 9A and 9B are a plan view and a side view, respectively, showing the center of gravity of the whole and a part of the image display device according to the first embodiment;
FIG. 10 is a plan view (a), a front view (b), and a side view (c) of the video display device according to the second embodiment.
FIG. 11A is a plan view, FIG. 11B is a front view, and FIG. 11B is a side view of a video display device according to the third embodiment.
12A is a plan view, FIG. 12B is a front view, and FIG. 12B is a side view of a video display device according to a fourth embodiment.
FIG. 13 is a plan view (a) and a front view (b) of an image display device according to a fifth embodiment.
14A and 14B are a plan view and a front view, respectively, of a video display device according to a sixth embodiment.
[Explanation of symbols]
1,2,3,4,5,6 video display device
10, 10L, 10R transparent plate
11, 11L, 11R Volume phase hologram (eyepiece optical system)
20, 20L, 20R housing
30, 30L, 30R mounting part
31 Spring member
31a Spring member front
31b Rear part of spring member
31c Upper spring member
32 case
32a Rear wall of housing
33 operation members
40L, 40R balancer
50, 50L, 50R cable
60 Mounting part
61 Fixing member
62 movable members
71 Light emitting diode
72 convex lens
73 Transmissive liquid crystal display (display unit)
80 glasses
81L, 81R lens
83 Bridge
86 Nose pad
87L, 87R Yoroi

Claims (5)

An image display device attached to eyeglasses,
A display unit for displaying an image,
An eyepiece optical system that provides a virtual image of an image displayed by the display unit to an observer,
A video display device comprising: a mounting portion that is locked to a bridge of spectacles. An image display device attached to eyeglasses,
A display unit for displaying an image,
An eyepiece optical system that provides a virtual image of an image displayed by the display unit to an observer,
A mounting part locked to the glasses,
A video display device comprising: a balancer that positions the center of gravity of the entire device behind a nose pad of glasses. An image display device attached to eyeglasses,
A display unit for displaying an image,
An eyepiece optical system that provides a virtual image of an image displayed by the display unit to an observer,
A mounting part locked to the glasses,
An image display device comprising: an operation unit that releases a lock of the mounting unit by applying a pinching force from a vertical direction. An image display device attached to eyeglasses,
A display unit for displaying an image,
An eyepiece optical system comprising a volume phase hologram that provides a virtual image of an image displayed by the display unit to an observer,
A transparent light guide that internally reflects light from the display unit and guides the light to the eyepiece optical system,
An image display device comprising: a mounting portion that is locked to eyeglasses. The image display device according to any one of claims 1 to 4, wherein the position of the eyeglasses at which the mounting portion is locked has a degree of freedom in at least one of the left-right direction and the up-down direction.

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