JP3884850B2 - Video display device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention enlarges video from a television set or the like that is worn on the observer's head or face and displayed on a pair of display elements, in front of both eyes of the observer via a pair of observation optical systems. The present invention relates to a video display device for display.
[0002]
[Prior art]
Since this type of conventional video display apparatus is often worn on the observer's head, it is referred to as a head-mounted video display apparatus or a head-mounted display (HMD). Entertained video.
[0003]
For example, as shown in FIG. 6, the apparatus main body 1 of the video display apparatus is mounted in front of both eyes E of the observer M via an ear hook unit (not shown). A pair of left and right LCDs 3 for displaying a two-dimensional image is arranged inside the frame 2 of the apparatus main body 1, and a pair of backlights 4 for illuminating the LCD 3 are arranged behind the LCD 3, and below the LCD 3. Are provided with a pair of prisms 5 for enlarging and guiding the image from the LCD 3 to both eyes E, respectively. The image displayed on the LCD 3 is guided through the respective observation optical axes L in front of the eyes M of the observer M, and is enlarged while passing through the prisms 5 so as to float in front of the eyes E. Respectively.
[0004]
At this time, since the observer M observes the image of the same object, the left and right images projected in front of both eyes E of the observer M need to match or fuse with high accuracy. This is because if the left and right images are not fused, the observer M may be presented with symptoms such as headache, nausea, dizziness, and eye strain. However, since both eyes E observe the image from the left and right LCDs 3, it is easily considered to observe the left and right images in a shifted state.
[0005]
Research on human visual characteristics is disclosed in “Survey Report on Visual Perception”, Seminar Report on SID (Society for Information Display), and the like. In these reports, the amount of deviation of the vertical optical axis between the left and right images greatly affects the appearance of the image, and when the amount of deviation is less than 5 minutes, the observer is the same without being aware of the left and right images. It is taught that the right and left images are not fused when the amount of deviation exceeds 5 minutes, for example, exceeds 10 minutes.
[0006]
For this reason, the left and right observation optical axes L of the video display device need to be matched with high accuracy, and when the video display device is manufactured, the amount of deviation of the left and right observation optical axes L is as described in the above report. It is necessary to be within a predetermined standard value.
[0007]
[Problems to be solved by the invention]
However, even if the deviation amount of the observation optical axis L on the left and right of the video display device falls within a predetermined standard value, the video display device is dropped, bumped, or pressed with an unreasonable force to display the video. When an external force is applied to the device, the video display device may be elastically or plastically deformed. For this reason, in the case of elastic deformation, the left and right observation optical axes L naturally match after the external force disappears. However, in the case of plastic deformation, the observation optical axis L remains displaced and does not return to the original position. There is a problem that the video of In addition, when correcting the deviation of the observation optical axis L, it is necessary to return the image display device to the factory or the repair shop and repair it using a dedicated tool.
[0008]
The object of the present invention is to eliminate the above-mentioned problems and prevent the observation optical axis from deviating, and to allow the observer to recognize when the observation optical axis is deviated, so that the observer is always correct. An object of the present invention is to provide an image display device that can be observed in a state.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, an image display apparatus according to the present invention includes a display element that displays an image, an observation optical system that guides an image from the display element to both eyes of an observer, and the display element and the observation optical system. In the video display device having a fixing member that fixes the display member and an exterior member that covers the display element and the observation optical system and that is fixed to the fixation member, the exterior member includes at least two members divided in the front and rear directions. The fixing member is fixed to the fixing member via a buffer member, and the member attached to the outside of the exterior member is broken with a force slightly smaller than a force for plastically deforming the fixing member.
The video display device according to the present invention includes a display element that displays an image, an observation optical system that guides an image from the display element to both eyes of an observer, and a fixing member that fixes the display element and the observation optical system. And an exterior member that is fixed to the fixing member and covers the display element and the observation optical system, wherein the exterior member is composed of at least two members divided in the front-rear direction. The member fixed through the buffer member and the member attached to the outside of the exterior member is deformed with a force slightly smaller than the force for plastically deforming the fixing member.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described in detail based on the embodiment shown in FIGS.
FIG. 1 is a side view of a first embodiment of a video display device 11 attached to an observer M. A pair of ear hooks 13 are provided on the left and right sides of the device main body 12 so that the device main body 12 can be folded. It is held in front of both eyes of the observer M via an ear hook 13 that is hooked on the ear. In addition, a pair of earpieces 14 to be worn on the ears of the observer M is led out from the apparatus main body 12 via the respective cords 15.
[0011]
2 is a cross-sectional view of the apparatus main body 12, and FIG. 3 is an exploded perspective view. A front cover 21 and a rear cover 22 that are exterior members are fixed to a fixing member 23 from the front and rear. Fixed to the fixing member 23 is an image display unit 24 that enlarges and projects an image from a video, television, or the like (not shown) in front of the eyes of the observer M.
[0012]
A predetermined space is provided between the front cover 21 and the video display unit 24, and a predetermined space is also provided between the rear cover 22 and the video display unit 24. This prevents the covers 21 and 22 from coming into contact with the video display unit 24 even if the video display device 11 is dropped, bumped or pushed.
[0013]
The rear cover 22 has a pair of windows 22a and 22b for guiding an image from the video display unit 24 to both eyes of the observer M, and a pair of pin-like portions 22c and 22d fixed to a fixing portion (not shown) of the front cover 21. And are provided. The fixing member 23 has a frame shape of eyeglasses, and a pair of frame portions 23a and 23b are bridged by a bridge portion 23c. A pair of piece-like portions 23f and 23g having insertion holes 23d and 23e through which the pin-like portions 22c and 22d of the rear cover 22 are inserted are provided on the outer sides of the frame-like portions 23a and 23b, respectively.
[0014]
The video display unit 24 is displayed on the LCD 25, a pair of LCDs 25 that are elements for displaying a two-dimensional video, a pair of backlights 26 that respectively illuminate the LCD 25, a pair of holding members 27 that hold the LCD 25 and the backlights 26. It is composed of a pair of prisms 28 as an eyepiece optical system for enlarging and projecting the recorded image in front of both eyes of the observer M via the observation optical axis L, and a substrate 29 for driving the LCD 25 and the backlight 26. The pair of holding members 27 each holding the LCD 25 and the backlight 26 are adjusted with a very high accuracy and fixed to the fixing member 23 so that the deviation of the observation optical axis L of the left and right LCDs 25 is 5 minutes or less. .
[0015]
Between the outer periphery of the pin-like portions 22c and 22d of the rear cover 22 and the peripheral walls of the insertion holes 23d and 23e of the fixing member 23, annular buffer members 30 are respectively interposed. Anti-vibration rubber such as butyl rubber having excellent vibration damping characteristics is used for the buffer member 30, and grooves (not shown) in which the peripheral walls of the insertion holes 23 d and 23 e of the fixing member 23 are press-fitted on the outer peripheral surface of the buffer member 30. Is formed.
[0016]
When fixing the covers 21, 22 to the fixing member 23, the buffer members 30 are attached to the peripheral walls of the insertion holes 23 d, 23 e, and then the pin-like portions 22 c, 22 d of the rear cover 22 are pressed against the inner diameter holes of the buffer members 30. Insert and fix to the fixing part of the front cover 21. Accordingly, the fixing member 23 is suspended from the pin-like portions 22 c and 22 d of the rear cover 22 via the buffer member 30 and is disposed so as to be sandwiched between the front cover 21 and the rear cover 22. Further, an appropriate load is applied to the buffer member 30, and the fixing member 23 and the video display unit 24 are held in a stable state by the covers 21 and 22.
[0017]
When an external force is applied to the covers 21 and 22, the external force is transmitted to the buffer member 30 while deforming the covers 21 and 22, and is attenuated by the buffer member 30. For this reason, the external force is hardly transmitted to the fixing member 23, and the fixing member 23 hardly deforms or becomes small even when deformed. Therefore, there is no deviation in the observation optical axis L of the left and right image display units 24, and the observer M can always observe the image in the correct state.
[0018]
In the present embodiment, the covers 21 and 22 divided into two parts have been described. However, the cover may be constituted by a member divided into three or more parts such as a cover member attached to the front and rear covers.
[0019]
FIG. 4 is a partial cross-sectional view of the second embodiment, in which the front cover 21 and the rear cover 22 are downsized. For this reason, when the force W which plastically deforms the fixing member 23 is applied to the covers 21 and 22, the distance between the covers 21 and 22 and the video display unit 24 is such that the covers 21 and 22 come into contact with the video display unit 24. Is set.
[0020]
This is because if the damping coefficient of the buffer member 30 is μ, when a force W is applied to the covers 21 and 22, the force applied to the fixing member 23 is μ × W. However, the attenuation coefficient μ is a numerical value of 1 or less determined by the material and shape of the buffer member 30. If the deformation amount E ₁ of the covers 21 and 22 at this time is a function of the force W, the deformation amount E ₂ of the fixing member 23 is a function of the force μ × W.
[0021]
On the other hand, the force W ′ that plastically deforms the fixing member 23 by being applied to the covers 21 and 22 is a force that leaves the deformation amount E ₂ in the fixing member 23, and the fixing member 23 is plastically deformed by a force of μ × W ′. become. In other words, when the force W applied to the covers 21 and 22 is W ′ or less, the fixing member 23 is not plastically deformed. When the force W applied to the covers 21 and 22 is released, the shape of the fixing member 23 is Return to the original. However, when one of the covers 21 and 22 comes into contact with the image display unit 24 by the deformation amount E ₁ due to the force W ′, the image display unit 24 has a force μ × W ′ attenuated by the buffer member 30. Instead, the force W applied to the front cover 21 or the rear cover 22 is directly applied, and the video display unit 24 may be plastically deformed.
[0022]
For this reason, the space between the covers 21 and 22 and the video display unit 24 needs to be sufficiently spaced as in the first embodiment. However, when the covers 21 and 22 come into contact with the video display unit 24, the fixing member 23 has already been plastically deformed by the force μ × W ′ transmitted through the buffer member 30, so that the plastic member is deformed plastically. And the interval between the covers 21 and 22 and the video display unit 24 can be narrowed.
[0023]
FIG. 5 is a perspective view of the third embodiment, in which a pad 31 that is in contact with the forehead of the observer M is provided at the upper center of the covers 21 and 22 by fixing or the like. Then, when the observer M wears the image display device 11 ′, when a force slightly smaller than the force W ′ for plastically deforming the image display unit 24 is applied to the covers 21, 22, the ear hook 13 or the pad 31 is formed so as to be separated from the covers 21 and 22.
[0024]
The hinge portion 13a between the device main body 12 and the ear hook portion 13 is a portion where force is concentrated when the observer M wears the video display device 11, and is formed so as not to be easily broken. . For this reason, it is preferable that the hinge part 13a with respect to the ear hook part 13 and the fixing part (not shown) with respect to the pad 31 separate the ear hook part 13 or the pad 31 from the apparatus main body 12 with a force slightly smaller than the force W. Moreover, it is desirable to form the hinge part 13a and the adhering part so that they can be easily replaced from the viewpoint of maintainability.
[0025]
In this third embodiment, the ear hook 13 or the pad 31 separates from the apparatus main body 12 when a force slightly smaller than the force W is applied to the covers 21 and 22. No force is applied, and the fixing member 23 and the video display unit 24 are not plastically deformed. Further, since it is possible to present to the observer M that the excessive force has been applied to the covers 21 and 22 by separating the ear hook 13 and the pad 31, it is possible to observe in a state where the fixing member 23 and the video display unit 24 are plastically deformed. There is no. Furthermore, since it can be reused only by assembling the ear hooks 13 and the pads 31 to the covers 21 and 22, costs for parts and labor can be saved.
[0026]
In the third embodiment, the covers 21 and 22 and the pad 31 are separated from the apparatus main body 12, but may be destroyed or deformed.
[0027]
【The invention's effect】
As described above, in the video display device according to the present invention, since the exterior member is fixed to the fixing member via the buffer member, the force applied to the exterior member can be attenuated by the buffer member, Since deformation can be prevented or suppressed, it is possible to have the observer always observe in the correct state.
[Brief description of the drawings]
FIG. 1 is a side view of a first embodiment of a video display device worn by an observer.
FIG. 2 is a cross-sectional view of the apparatus main body.
FIG. 3 is an exploded perspective view of the apparatus main body.
FIG. 4 is a partial cross-sectional view of a second embodiment.
FIG. 5 is a perspective view of a third embodiment.
FIG. 6 is a partial cross-sectional view of a conventional example attached to an observer.
[Explanation of symbols]
11, 11 ′ Video display device 12 Device main body 13 Ear hook portion 21 Front cover 22 Rear cover 23 Fixing member 24 Video display unit 25 LCD
28 Prism 30 Relief member 31 Pad

Claims (4)

A display element for displaying an image, an observation optical system for guiding an image from the display element to both eyes of an observer, a fixing member for fixing the display element and the observation optical system, and the display element fixed to the fixing member And an exterior member that covers the observation optical system, wherein the exterior member is composed of at least two or more members divided in the front-rear direction, fixed to the fixing member via a buffer member, and the exterior An image display device, wherein a member attached to the outside of the member is broken with a force slightly smaller than a force for plastic deformation of the fixing member. A display element for displaying an image, an observation optical system for guiding an image from the display element to both eyes of an observer, a fixing member for fixing the display element and the observation optical system, and the display element fixed to the fixing member And an exterior member that covers the observation optical system, wherein the exterior member is composed of at least two or more members divided in the front-rear direction, fixed to the fixing member via a buffer member, and the exterior A video display device, wherein a member attached to the outside of the member is deformed with a force slightly smaller than a force for plastically deforming the fixing member.   When the force applied to the fixing member from the exterior member via the buffer member is smaller than the force that plastically deforms the fixing member, the exterior member does not come into contact with the display element or the observation optical system. The video display device according to claim 1 or 2.   A member attached to the exterior of the exterior member includes a pair of ear hooks that are attached to both ends of the exterior member and hooked to the observer's ears, or a pad that is in contact with the forehead of the observer attached to the approximate center of the exterior member. The video display device according to any one of claims 1 to 3.

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