JPH07244253A - Head-mounted video display device - Google Patents

Abstract

PURPOSE:To simply use a video display device by setting a distance to an exit pupil formed by an optical system for introducing an image to be farther than a specified value and always keeping the visibility larger than a specified value. CONSTITUTION:The video display device A arranges back light parts for a left eye and a right eye on the upper part, respectively, a distance from the exit plane 22a of a prism, being the final optical plane of an optical system 21 for introducing the respective images, left and right, to an exit pupil (observer's pupil) i.e., an eye relief 31 is set >=15mm and the visibility of the optical system 21 for introducing the respective images is always kept >=-4m <-1>. In this case, when the optical system 21 for introducing the images has the eye relief >=15mm, an observer B utilizes the video display device A while he wears glasses D adaptable to his own sight as it is. Consequently, by enabling the use of the device while wearing the glasses D as it is, the unnecessary adjustment of diopter to a near point by a far-sighted person or a normal sighted person can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a head-mounted type which is detachably mounted on an observer's head and used to directly project an observation image on the retina in the eyeball of the observer in an enlarged manner. The present invention relates to an image display device, and more particularly to an improvement of a head-mounted image display device that is irrelevant to the eyesight of an observer or can be used according to the eyesight.

[0002]

2. Description of the Related Art In recent years, an image displayed on a small CRT or an image display device such as a liquid crystal display device is directly projected on the retina in the eyeball of an observer by an image introduction optical system, whereby the image is displayed. A head-mounted image display device capable of observing a virtual image as if it were magnified and projected in the air has been developed. Here, in the case of this type of image display device, in order to allow the observer to easily experience a highly realistic image observation, the device itself is provided with required functional elements and the like, and comparison is made. It is general to display the screen of a relatively small image display element in a sufficiently enlarged manner so as to easily provide the same effect as observing a large screen.

On the other hand, in this head-mounted image display device, an observer who uses this device is able to perform good image observation even in cases other than normal vision such as myopia and hyperopia. In addition, it usually has a diopter adjustment mechanism for focusing a displayed image, and the diopter adjustment is set within a range of approximately +2 to -10 m ^-1 . As the conventional diopter adjusting mechanism, a means for moving the image display element itself or the lens of the image introducing optical system along the optical axis, or proposed in JP-A-5-48991. As described above, there is a means for moving the mirror, etc., and the observer performs the desired observation after focusing the displayed image by operating the diopter adjustment mechanism.

[0004]

However, it is generally known that the head-mounted image display device having the above-described conventional diopter adjusting mechanism causes a phenomenon called so-called mechanical myopia. ing. That is, this myopia
Under the subconscious that the observer looks into the displayed observation image from the purpose of using the device and the configuration of the entire device,
There is a risk of adjusting the diopter so that the image plane of the observed image is located closer to the near point than necessary, and in this case, the muscles that adjust the lens in the eyeball of the observer are strained. Since it is held as it is, it causes unfavorable problems such as so-called eye strain and the possibility of myopia when observing an image for a long time in the tension state. there were.

The present invention has been made in order to solve such conventional inconveniences, and its purpose is to:
Provided is a head-mounted image display device which can be easily used, and which is not likely to cause the hyperopia or normal vision person to set the diopter to the near point region unnecessarily when the diopter is selected. It is to be.

[0006]

In order to achieve the above object, the first invention according to claim 1 of the present invention is an image display device for displaying an image, and an observer viewing the displayed image. In a head-mounted image display device having an image introducing optical system for guiding to the eyeball, the distance from the final optical surface of the image introducing optical system to the exit pupil formed by the image introducing optical system is set to at least 15 mm or more. In addition, it is characterized in that the diopter of the image introduction optical system can be constantly maintained at -4 m ^-1 or more.

A second invention according to claim 2 of the present invention is a head including an image display device for displaying an image and an image introducing optical system for guiding the displayed image to an eyeball of an observer. The wearable image display device is provided with a diopter adjusting means for adjusting the diopter of the image introducing optical system within a predetermined range corresponding to the visual acuity of an observer, and the diopter adjusting means is It is characterized in that a diopter closest point changing means for changing and setting the closest point for power adjustment is arranged.

Furthermore, the third aspect of the present invention according to claim 3
According to another aspect of the present invention, in a head-mounted image display device including an image display element for displaying an image and an image introduction optical system for guiding the displayed image to an eyeball of an observer, the diopter of the image introduction optical system is observed. The present invention is characterized in that a stepwise diopter adjusting means is provided so that adjustment and setting can be made stepwise according to the visual acuity of a person.

[0009]

Therefore, in the head-mounted image display apparatus according to the first aspect of the present invention, from the prism exit surface, which is the final optical surface of each of the left-eye and right-eye image introduction optical systems, to the exit pupil. The eye relief is set to 15 mm or more, and the diopter of each of the image introduction optical systems 21 can be constantly maintained at -4 m ^-1 or more, so that the observer can wear the eyeglasses suitable for his or her eyesight. Will be available at.

In the head-mounted image display apparatus according to the second aspect of the present invention, the diopter nearest point changing means is used,
In advance, by setting the closest point of diopter adjustment for each predetermined adjustment range, by adjusting the observation diopter by the diopter adjusting means in accordance with the visual acuity of the observer within the setting range. , The observed diopter can be used without unnecessarily approaching the near point region.

Further, in the head-mounted image display apparatus according to the third aspect of the present invention, the stepwise diopter adjusting means is operated based on the stepwise adjustment setting of the observation diopter by the stepwise diopter adjusting means. By this, it is possible to select a diopter suitable for the visual acuity of the observer from among the observation diopters set in stages, and also in this case, the diopter is used without unnecessarily approaching the near point region. You can

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a head-mounted image display device according to the present invention will be described below in detail with reference to FIGS.

FIG. 1 is a side view schematically showing the configuration of a head-mounted image display apparatus to which an embodiment of the first invention of the present invention (hereinafter, referred to as a first embodiment for convenience of explanation) is applied. FIG. In this case, the head-mounted image display device is configured by incorporating one set for the left eye and one for the right eye, but here, in order to avoid complexity of the description, only one of them is used here. The description will be made centeringly, and this is exactly the same in the configurations of the following embodiments.

That is, in the first embodiment shown in FIG. 1, the head-mounted image display apparatus A has the backlight units 12 for the left eye and the backlight unit for the right eye respectively arranged above and shown in the drawing. Left-eye and right-eye image display elements, each of which is a liquid crystal display element (hereinafter referred to as LCD) 11, which is controlled by an omitted image display controller or the like to display a desired image, respectively. The left and right eye half mirrors 23 and the concave prisms 24 are used for the respective prisms 22, and the images displayed on the LCDs 11 are enlarged and the left and right eyeballs C of the observer B are enlarged. The image introduction optical system 21 for the left eye and the image introduction optical system for the right eye, which is guided inward, and in the case of the first embodiment, the prism exit surface which is the final optical surface of each image introduction optical system 21. 22a to the exit pupil (observer's pupil), that is, the eye It sets a leaf 31 above 15 mm, the diopter of the respective video introduction optical system 21 at all times -4
It is configured such that it can be maintained at m ^-1 or more.

Here, the eye relief 31 is 15 mm.
With the above image introduction optical system 21, the distance from the spectacle lens surface to the pupil standardized by JIS is “12 m”.
Since m "is taken into consideration, the observer B can use the head-mounted image display apparatus A while wearing the spectacles D suitable for his own visual acuity.
Depending on the design requirements, the distance to the pupil may often be made larger than the standard. In such a case, if the eye relief 31 is 20 mm or more, most of the commercially available products are generally sold. Can be adapted to most glasses.

On the other hand, in the normal case, with regard to the clear viewing distance,
Since it is generally said to be about 250 mm, the near point limit value of the diopter adjustment range may be -4 m ^-1 or more,
In addition, the range that can be seen without straining the lens muscles in the eyeball, that is, the range that can be seen in the so-called adjustment rest position is said to be about 500 mm or more. More preferably, the near point limit value is −2 m ⁻¹ or more.

As described above, in the case of the device configuration according to the first embodiment, the eye relief 31 from the prism exit surface 22a, which is the final optical surface of each image introduction optical system 21, to the exit pupil is set to 15 mm or more. In addition, since the diopter of each image introduction optical system 21 can be constantly maintained at -4 m ^-1 or more, the observer B can use it while wearing the spectacles D suitable for his own visual acuity. Therefore, by enabling the use while wearing the spectacles D as described above, the range of diopter adjustment can be narrowed as compared with the conventional case, and in particular, on the near point side. Since the area can be narrowed, the hyperopia or normal vision person has the advantage of being able to prevent unnecessarily diopter adjustment to the near point side, and as a result,
The image display apparatus A can be used easily and easily, and here, there is no fear that eye strain or the like will occur, and the possibility of myopia is also eliminated.

In the construction of the first embodiment described above, the prism 22 is used for the image introducing optical system 21, but the invention is not limited to such a prism 22.
Any configuration may be used as long as the same effect can be obtained as the image introduction optical system 21.

Next, FIGS. 2 and 3 are views of a head-mounted image display apparatus to which an embodiment of the second invention of the present invention (hereinafter, referred to as a second embodiment for convenience of description) is applied. FIG. 3 is a cross-sectional configuration diagram schematically showing an overview of a power adjusting mechanism, and an external perspective view schematically showing an outline of a head-mounted image display device incorporating the diopter adjusting mechanism.

In the second embodiment shown in FIGS. 2 and 3, the diopter adjusting mechanism 41 for the left eye and the right eye, which is applied to the head-mounted image display apparatus A, includes Each diopter that allows the diopter of the introduction optical system 21 to be adjusted steplessly within a specific range corresponding to the visual acuity of the observer, and the closest point of each diopter adjustment can be changed and set. In the case of the second embodiment, the closest point changing mechanism 51 is included, and in the case of the second embodiment, the left-eye and right-eye LCDs 11 are arranged along the optical axes of the corresponding image introduction optical systems 21. The movement can be adjusted arbitrarily.

That is, in the case of the second embodiment, for the left eye,
As shown in FIGS. 2 and 3, each diopter adjustment mechanism 41 for the right eye fixedly grips the end portion of each LCD 11, and in this case, although not shown, the rotation stopper is appropriately stopped. Each of the screw guide piece members 42 provided with the respective means and the respective adjustment knobs 44 at the upper end thereof are provided to move the screw guide piece members 42 in the vertical direction, in this case, the light of the image introduction optical system 21. The left and right eye diopter adjusting mechanisms 41 configured by the respective operating screw shaft members 43 that are screwed together so as to be capable of screwing back and forth along the axial direction. It is installed in a device housing 61 of A by occupying a predetermined position.
In FIG. 3, reference numeral 62 is a wearing band for wearing the image display device A on the observer's head.

Further, the diopter closest point changing mechanisms 51 for the left and right eyes are also arranged in association with the diopter adjusting mechanisms 41 as shown in FIGS. 2 and 3. The screw guide piece member 42 can be regulated in common in the vertical screw advance / retreat position (individually if necessary), and the upper and lower portions are set to the adjustment intervals corresponding to the specific ranges. Each stopper member 52, 53 consisting of one set of
Although not shown in the drawing, the upper and lower stopper members 5 are also provided by way of appropriate switching means.
2, 53 are normal vision positions a-52, a-53, myopia position b
-52, b-53, and hyperopic positions c-52, c-53
Switch knob 5 that can be selectively set in each of the three stages
4 and. Here, each set position a in each of the upper and lower stopper members 52 and 53
Regarding −, b−, and c−, for example, the set positions b-52 and b-53 for myopia are set closer to the near point side with reference to the set positions a-52 and a-53 for normal vision. , The setting positions c-52 and c-53 for the farsighted persons are set to the far point side respectively, and the dioptric power limit value at the near point side is similarly set, for example, for the nearsighted person- 10m ^-1, respectively set to -2m ^-1 is for -4m ^-1, hyperopia who is for the normal viewer.

Thus, in the case of the configuration of the second embodiment, the observer B firstly selects the switching knob 54 of the image display apparatus A.
Is selectively switched to set the upper and lower stopper members 52 and 53 within the diopter range corresponding to their own visual acuity, and then the video display device A is mounted on the head. That is, if the visual acuity tendency of the observer B is hyperopia, the hyperopia positions c-52 and c-53 are selectively set. Then, with the image display device A still attached to the head in this manner, the adjustment knobs 44 are individually rotated while watching each image projected on the left eye and the right eye. Due to
After focusing within a limited diopter range set between the stopper members 52 and 53, the stopper members 52 and 53 are used as expected.

As described above, in the second embodiment, the diopter range that can be adjusted for normal vision, myopia, and hyperopia is specified when selecting and adjusting the observation diopter. For this reason, focusing can be performed relatively easily and quickly, and the fear that a normal vision person or a farsighted person may bring the observation diopter closer to the near point area unnecessarily is eliminated. As a result, the desired image observation can be comfortably performed.

Next, FIGS. 4 and 5 show steps in a head-mounted image display apparatus to which an embodiment of the third invention of the present invention (hereinafter, referred to as a third embodiment for convenience of description) is applied. FIG. 3 is a cross-sectional configuration diagram schematically showing the outline of the objective diopter adjustment mechanism, and an external perspective view schematically showing the outline of a head-mounted image display device incorporating the stepwise diopter adjustment mechanism.

In FIGS. 4 and 5, the apparatus of the third embodiment is different from the head-mounted image display apparatus A in each view of the image introduction optical systems 21 for the left and right eyes. The present invention is provided with each stepwise diopter adjusting means 71 capable of adjusting and setting the stepwise in accordance with the visual acuity of the observer. Even in the case of the device of the third embodiment, the second embodiment is also used. As in the case of the device, the left-eye LCD 11 and the right-eye LCD 11 can be optionally moved to preset diopter positions along the optical axis of the corresponding image introduction optical system 21. It is the one.

That is, in the case of the third embodiment, for the left eye,
The stepwise diopter adjustment mechanism 71 for the right eye is shown in FIGS.
As shown in FIG. 3, one end of each LCD 11 is fixedly held, and in this case, although not shown, each guide piece member 72 is appropriately provided with rotation stopping means, and each LCD 11 Internal spring 7 fixed to the end
Setting pin 74 that is always elastically held upward by 5
Each setting piece member 73 and each guide piece member 72 in the vertical direction, in this case, each image introducing optical system 2
Each guide shaft member 7 for guiding along the optical axis direction of 1.
6, and a setting spring 77 that constantly elastically presses each setting piece member 73 upward, and a setting spring 77 that is slidably arranged above each setting piece member 73 and that opposes each setting pin 74. A predetermined step is mutually provided on the cam slope 79 which is a surface to receive the setting pin 74 at the normal vision position, a normal vision position setting groove a-80, a near vision position setting groove b-80 and a myopia position. And a selective knob 78 in which hyperopic position setting grooves c-80 to be received at respective positions are formed in a stepwise manner, and the stepwise diopter adjustment for the left eye and the right eye is performed by the configuration. The mechanism 71 is the second
As in the case of the apparatus of the embodiment, the image display apparatus A is installed in a device housing 61 occupying a predetermined position.

Here, the cam slope 79 of the selective knob 78 is provided.
Position setting grooves a-80, b-80, c- drilled on the top
Regarding 80, as in the case of the second embodiment, the position setting groove a-80 for normal vision is used as a reference, and the position setting groove b-80 for myopia is closer to the near point side, and sets each more far point side positioning groove c-80 of the use, for the diopter limit value in the near point side, for example, -10 m ^-1 is for myopes, in a normal viewer-4M ^{- 1} , for hyperopia, set to -2m ^-1 respectively. And in this case,
By the selective sliding operation of the selective knob 78, the setting pin 74 of each of the left-eye and right-eye setting piece members 73, the elastic force of the setting spring 77, and each guide on each guide shaft member 76 are guided. By the guide movement of the bridge member 72, the normal vision position setting groove a-80, the myopic position setting groove b-80, or the far vision position setting groove c-80 can be selectively received, respectively, and as a result, , The LCDs 11 can be easily moved to the corresponding diopter positions.

Thus, in the case of the configuration of the third embodiment, the observer B selectively slides the selective knob 78 of the image display device A to the diopter setting position corresponding to his own visual acuity. Then, the video display device A is mounted on the head. That is, also here, when the visual acuity tendency of the observer B is hyperopia, by selecting each hyperopia position setting groove c-80, the setting pin 74 is received in each hyperopia position setting groove c-80, and each LC is selected.
D11 is set to the corresponding hyperopia position, and is used as intended in this way. In addition, in the third embodiment, the diopter setting is made for normal vision, myopia, and hyperopia.
Although it is set in stages, it may be set in more stages.

As described above, in the third embodiment, when the observation diopter is selected, the diopter range is limitedly specified for normal vision, myopia, and hyperopia. By the operation of simply sliding the selective knob 78,
It is very easy to set the corresponding diopter range, and here again it is possible to completely eliminate the fear that the normal or farsighted person brings the observation diopter closer to the near point area unnecessarily. is there.

Next, practical examples of the image introduction optical system 21 will be described separately with reference to FIGS. 6 and 7.

Here, all the lens data in each of the specific examples is reverse tracking from the pupil position to the display surface position of the liquid crystal display element 11, and the first surface thereof is the pupil position, In this case, the effective pupil diameter at the pupil position is 8 mmφ in each specific example. On the other hand, in each of the specific examples, the coordinates are set respectively as shown in FIGS. 6 and 7. That is, in these FIGS. 6 and 7, r ₀ , r ₁ , r ₂ , ... Are the radii of curvature of the corresponding surfaces, and d ₀ , d ₁ , d ₂ ,
... is the distance between the corresponding surfaces, and x after the numerical value, and
y represents a direction, nd ₁ , nd ₂ , ... Are d-line refractive indices, and νd ₁ , νd ₂ ,. In each specific example, the half mirror surface is 45 ° with respect to the x-axis and the y-axis.
It shall be inclined.

First specific example. The first specific example is a case where a half mirror and a concave mirror are used and the eye relief is set to 15 mm, and corresponds to FIG. Angle of view 30.0 × 22.5 ° r ₀ = ∞ (pupil) d ₀ = 15,000 (x) r ₁ ＝ 100.000 d ₁ ＝ 3.000 (x), nd ₁ ＝ 1.48700, νd ₁ ＝ 70.4 r ₂ ＝ -100.000 d ₂ ＝ 10.500 (x) r ₃ = ∞ (half mirror) d ₃ = 12.000 (y) r ₄ = 70.000 (concave mirror) d ₄ = -24.238 (y) r ₅ = ∞ (liquid crystal display element)

Second specific example. The second specific example is a case where a prism having a half mirror and a concave mirror is used and the eye relief is set to 20 mm, and corresponds to FIG. 7. Angle of view 35.0 × 26.3 ° r ₀ ＝ ∞ (pupil) d ₀ ＝ 20.00000 (x) r ₁ ＝ 77.43753 d ₁ ＝ 3.00000 (x), nd ₁ ＝ 1.51633, νd ₁ ＝ 64.1 r ₂ ＝ -77.43753 d ₂ ＝ 0.50000 (x) r ₃ ＝ ∞ d ₃ ＝ 12.05080 (x), nd ₃ ＝ 1.51633, νd ₃ ＝ 64.1 r ₄ ＝ ∞ (half mirror) d ₄ ＝ 14.35840 (y), nd ₄ ＝ 1.51633, νd ₄ ＝ 64.1 r ₅ = -81.57246 (concave mirror) d ₅ = -24.00000 (y), nd ₅ = 1.51633, νd ₅ = 64.1 r ₆ = 63.91929 d ₆ = -2.38382 (y) r ₇ = ∞ (liquid crystal display element)

Therefore, as is apparent from the above description of each embodiment, the present invention is adapted to the respective configurations of (1), (2), and (3) described in claims 1, 2, and 3. And may have the following configurations. (4) The distance from the final optical surface of the image introducing optical system to the exit pupil formed by the image introducing optical system is 20 m
The head-mounted image display device according to claim 1, wherein the head-mounted image display device is set to m or more. (5) The head-mounted image display device according to claim 1, wherein the diopter of the image introduction optical system is always maintained at −2 m ⁻¹ or more. (6) The diopter of the image introduction optical system is provided with a diopter adjusting means capable of adjusting the diopter within a predetermined range corresponding to the visual acuity of an observer, 1, and (4), The head-mounted image display device according to (5). (7) The diopter adjusting means of (6) is characterized in that diopter closest point changing means for changing and setting the closest point of the diopter adjusting area is arranged (claims 1, and (4 ), (5), (6)) Head mounted image display device. (8) The closest point of (7) is set to be -2 m ^-1 or more (heads (1) and (4), (5), (6), (7)) Part-mounted video display device. (9) A step-by-step diopter adjusting means is provided which allows stepwise adjustment and setting of the diopter of the image introduction optical system in accordance with the visual acuity of an observer. (5), (6), (7),
The head-mounted image display device according to (8).

[0036]

In order to achieve the above object, according to the first aspect of the present invention, there is provided an image display device for displaying an image, and an image introduction optical system for guiding the displayed image to an eyeball of an observer. In the head-mounted image display device, the eye relief from the final optical surface of the image introducing optical system to the exit pupil formed by the image introducing optical system is at least 15 mm.
The above settings are made and the diopter of the image introduction optical system is always -4.
Since it is configured so that it can be maintained at m ⁻¹ or more, the observer can wear it while wearing eyeglasses suitable for his or her visual acuity without performing any adjustment operation such as focusing on the image display device. It can be used easily and easily, and it is structurally very simple and can be easily implemented.As a result, there is little risk of eye strain during use, and the possibility of myopia is also eliminated, There are various practical advantages that make it possible to perform desired image observation comfortably.

Further, according to the second aspect of the present invention, a head-mounted image display device having an image display element for displaying an image and an image introduction optical system for guiding the displayed image to an eyeball of an observer. The diopter adjusting means for adjusting the diopter of the image introducing optical system within a predetermined range corresponding to the visual acuity of an observer is provided, and the diopter adjusting means has the latest point of diopter adjustment. Since the diopter closest point changing means for changing and setting is arranged, the diopter closest point changing means is used in advance.
The closest point of the diopter adjustment is set for each within a predetermined adjustment range, and in this state, the diopter adjusting means adjusts the observation diopter within the set range in accordance with the visual acuity of the observer. As a result, there is no fear of bringing the observation diopter closer to the near point area unnecessarily, and there is an advantage that the present apparatus can be used extremely easily and easily.

Further, according to the third aspect of the present invention, a head-mounted image display device including an image display element for displaying an image and an image introduction optical system for guiding the displayed image to an eyeball of an observer. In the above, since it is configured by providing a stepwise diopter adjusting means capable of adjusting and setting the diopter of the image introduction optical system stepwise according to the visual acuity of the observer, the observation diopter by the stepwise diopter adjusting means By operating the stepwise diopter adjusting means on the basis of the stepwise adjustment setting, the diopter suitable for the visual acuity of the observer can be selected from among the stepwise set diopter, and here also, As in the second aspect of the invention, the present apparatus can be used extremely easily and easily without causing the observation diopter to approach the near point area unnecessarily.

[Brief description of drawings]

FIG. 1 is a side view schematically showing a schematic configuration of a head-mounted image display device to which an embodiment of the first invention of the present invention is applied.

FIG. 2 is a cross-sectional configuration diagram schematically showing the outline of a diopter adjustment mechanism in a head-mounted image display device to which an embodiment of the second invention of the present invention is applied.

FIG. 3 is an external perspective view schematically showing the outline of a head-mounted image display device incorporating a diopter adjustment mechanism according to an embodiment of the second invention.

FIG. 4 is a cross-sectional configuration diagram schematically showing an outline of a stepwise diopter adjustment mechanism in a head-mounted image display device to which an embodiment of the third invention of the present invention is applied.

FIG. 5 is an external perspective view schematically showing the outline of a head-mounted image display device incorporating a stepwise diopter adjustment mechanism according to an embodiment of the third invention.

FIG. 6 is a cross-sectional explanatory view showing details of an image display optical system according to a first practical example of the head-mounted image display device of the present invention.

FIG. 7 is an explanatory cross-sectional view showing details of an image display optical system according to a practical second specific example in the head-mounted image display device.

[Explanation of symbols]

A image display device B observer C eyeball of the observer D eyeglasses worn by the observer 11 liquid crystal display element (LCD, image display element) 12 backlight unit 21 image introduction optical system 22 prism 22a prism exit surface 23 half mirror 24 concave surface Mirror 31 Eye relief (distance from prism exit surface to exit pupil) 41 Diopter adjusting mechanism 42 Screw guide piece member 43 Actuating screw shaft member 44 Adjusting knob 51 Diopter nearest point changing mechanism 52, 53 Upper and lower one set Each stopper member consisting of a-52, a-53 Normal vision setting position b-52, b-53 Myopia setting position c-52, c-53 Hyperopia setting position 54 Switching knob 61 Device housing 62 Wear band 71 Stepped diopter Adjustment mechanism 72 Guide piece member 73 Setting piece member 74 Setting pin 75 Internal spring 76 Guide shaft member 77 Setting bar 78 Selection knob 79 Cam slope a-80 Normal vision position setting groove b-80 Myopia position setting groove c-80 Hyperopia position setting groove

Claims (3)

[Claims] 1. A head-mounted image display device comprising an image display element for displaying an image and an image introduction optical system for guiding the displayed image to an eyeball of an observer, wherein a final optical surface of the image introduction optical system. To the exit pupil formed by the image introduction optical system is at least 1
A head-mounted image display device, characterized in that it is set to 5 mm or more and the diopter of the image introduction optical system can be constantly maintained at -4 m ^-1 or more. 2. A head-mounted image display device comprising an image display element for displaying an image, and an image introduction optical system for guiding the displayed image to an eyeball of an observer, wherein the diopter of the image introduction optical system is adjusted. A diopter adjusting means is provided which can be adjusted within a predetermined range according to the visual acuity of the observer, and the diopter adjusting means is capable of changing and setting the closest diopter adjustment point. A head-mounted image display device characterized by being configured by arranging means. 3. A head-mounted image display device comprising an image display element for displaying an image and an image introduction optical system for guiding the displayed image to an eyeball of an observer, wherein the diopter of the image introduction optical system is adjusted. A head-mounted image display device comprising a stepwise diopter adjusting means capable of stepwise adjustment and setting corresponding to the eyesight of an observer.