JP2009157291A - Video display device and head mounted display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video display device having compact and lightweight see-through property providing dust-proofness and water-proofness. <P>SOLUTION: The video display device 1 includes: a display element 14 for displaying video; an ocular prism 17 for seeing an outside field by guiding light of the video displayed on the display element 14 to an optical pupil E and transmitting it; a casing 15 including and holding the display element 14 and a part of the ocular prism 17; and a first packing 4a so that it is in contact with the periphery of the ocular prism 17 and the casing 15. In a part in which the first packing 4a is in contact with the ocular prism 17 and video light of the ocular prism 17 is reflected, a mirror coat 17e is applied. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an image display device that provides an observer with an image displayed on a display element as a virtual image, and a head mounted display (hereinafter also referred to as an HMD) including the image display device.

  Conventionally, various head-mounted video display devices called HMDs have been proposed. In recent years, HMDs have begun to be used not only as general consumer products but also for use in supporting smooth operations by providing various information to users. Depending on the usage environment, functions that are not necessary for general consumer use may be required. For example, when it is assumed to be used outdoors, dustproof and waterproof properties are desired, and several techniques with these functions have been proposed.

  For example, the HMD disclosed in Patent Document 1 includes an LCD that is an element for displaying a two-dimensional image and a backlight for illuminating the LCD. The LCD and the backlight are integrally held by an LCD holder, and the LCD holder is attached to a fixing member. A substrate for driving the prism and the backlight is fixed to the fixing member. A dustproof member is disposed between the first surface of the prism and the LCD holder to prevent dirt and the like from adhering to the image exit surface of the LCD and the first surface of the prism.

In the head-mounted display device disclosed in Patent Document 2, the virtual image forming unit is housed and integrated in a casing having a substantially trapezoidal side shape. An opening for emitting image light is formed on the rear surface on the user side of the housing, and the opening is generally sealed by a lens or another transparent flat plate.
Japanese Patent Laid-Open No. 11-296095 JP-A-9-318905

  However, with the technique of Patent Document 1, although the dustproof property inside the video display unit is ensured, the entire display device becomes large and heavy, and it is difficult for the user to use for a long time. Moreover, in the technique of patent document 2, since only a housing | casing and a lens are match | combined, the dust resistance and waterproofness in the meantime are incomplete.

  As described above, the conventional video display device having see-through property and the HMD provided with the video display device have been increased in size and weight in order to provide dustproof and waterproof properties.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a small and lightweight video display device having dustproof and waterproof properties. Another object of the present invention is to provide a head mounted display provided with the video display device.

  In order to achieve the above object, the present invention provides a display element that displays an image, a prism that guides light of the image displayed on the display element to an optical pupil and transmits the light to the outside, and the display In a video display device comprising a casing that contains and holds an element and a part of the prism, a first packing is provided so as to be in contact with the periphery of the prism and the casing. In addition, a mirror coat is applied to a portion where the first packing is in contact with the prism and the image light of the prism is reflected.

  According to this configuration, the gap between the housing and the prism is closed by the first packing, and the waterproof and dustproof properties of the portion are secured and the image light is reflected by the mirror coat. Video light is not absorbed.

  In the video display device, a part of the first packing may be in contact with a portion of the prism that does not reflect video light.

  According to this configuration, the mirror coating does not have to be applied to the eyepiece prism portion where a part of the first packing contacts. This is because the image light is not reflected.

  In the video display device described above, the first packing may be specifically provided in a gap between the housing and the prism.

  In the video display device described above, it is preferable that the casing is composed of a plurality of parts, and a second packing is provided in a fitting portion between the parts having an appearance portion among the plurality of parts. This is to ensure waterproofness and dustproofness between the casing components in a general casing configuration.

  In the above video display device, a cable that is electrically connected to the display element to supply driving power and a video signal, and the cable is passed through and fixed, and the cable is held between the casings. It is desirable that the bush and the second packing be integrated.

  A simple structure is obtained by integrally molding the bush and the second packing.

  Further, in the video display device, a cable that is electrically connected to the display element and supplies driving power and a video signal, and the cable is passed through and fixed, and the cable is held between the casings. It is desirable to provide a bush, and the bush and the first packing are integrated.

  A simple structure is obtained by integrally molding the bush and the first packing. Further, the first packing may be integrally formed.

  In the video display device described above, it is preferable that a restricting portion for restricting a position of the first packing is formed on the prism.

  Providing the restricting portion facilitates positioning of the prism during assembly and does not cause displacement due to use. Further, since no deviation occurs, the first packing can be prevented from coming into contact with the portion where the image light is reflected.

  The present invention also provides a display element that displays an image, a prism that guides the light of the image displayed on the display element to the optical pupil and allows the outside to be seen through the display element, the display element, and the prism. In a video display device comprising a part and a casing that contains and holds the part, the casing is composed of a plurality of parts, and a part having an appearance portion of the plurality of parts is composed of rubber and plastic. At least a part of which is in contact with a fitting portion between the parts having the periphery and the appearance portion of the prism, the portion where the housing is in contact with the prism, and the portion where the image light of the prism is reflected, It is characterized by applying a mirror coat.

  According to this configuration, the rubber portion of the housing closes the space between the housing and the prism and the space between the housing components, ensuring the waterproofness and dustproofness of the portion, and the image light with the mirror coat. Is reflected, so that the image light is not absorbed by the casing portion in contact with the prism.

  Further, the image display apparatus includes a volume phase type hologram optical element, which diffracts and reflects the image light from the display element and guides it to the optical pupil, and at the same time transmits the external light to optically It is desirable to guide to the pupil.

  The hologram optical element makes it easy to observe the outside world while watching a bright image.

  Further, in the above video display device, the prism includes a first transparent substrate that totally reflects the video light from the display element and guides it to the optical pupil while transmitting the external light to the optical pupil; It is desirable to have a second transparent substrate for canceling refraction of external light on the first transparent substrate.

  According to this configuration, it is possible to observe a bright image and a bright and natural outside world. Further, the hologram optical element is not exposed and handling is easy.

  In addition, a head-mounted display according to the present invention includes any of the video display devices described above and a support unit that supports the video display device in front of an observer's eyes. As a result, the head can be worn.

  In the head-mounted display, the support means includes a pair of left and right temples that abut the observer's temporal region, a frame that rotatably supports each temple, a frame that supports the video display device, and an observer. It is desirable to have a nose pad that contacts the nose.

  Thereby, it can mount | wear like spectacles.

  According to the present invention, by using the packing, the gap between the casing and the prism and the gap generated in the fitting part between the casing parts are closed without increasing the size and weight, thereby providing waterproofness and dustproofness. can do.

(1. About HMD)
FIG. 1 is a perspective view showing a schematic configuration of the HMD according to the present embodiment, and FIG. 2 is a side view of the HMD in a state where the observer wears the HMD. The HMD includes an image display device 1, a support unit 2, and a cable 3.

  The video display device 1 displays video and provides it to the observer, and the support means 2 supports the video display device 1 in front of the observer's eyes. In the present embodiment, the support unit 2 supports the video display device 1 so as to be positioned in front of the right eye of the observer. However, two video display devices 1 are provided and positioned in front of both eyes. You may support it. In any case, by supporting the video display device 1 with the support means 2, the observer can observe the video displayed on the video display device 1 in a hands-free manner. The cable 3 connects an external control unit and the video display device 1, and supplies at least driving power and a video signal from the control unit to the video display device 1. Hereinafter, the video display device 1 and the support means 2 will be described in detail.

(2. About video display device)
3 is a cross-sectional view showing a schematic configuration of the video display device 1, and FIG. 4 is an exploded perspective view of the video display device 1 of FIG. The video display device 1 includes a light source 11, a unidirectional diffuser plate 12, a condenser lens 13, a display element 14, and an eyepiece optical system 16. The light source 11, the unidirectional diffuser plate 12, the condenser lens 13, and the display element 14 are accommodated as a unit 10 in the housing 15, and a part of the eyepiece optical system 16 (a part of an eyepiece prism 17 described later) is also included. It is located in the housing 15. The cable 3 described above is provided so as to penetrate the housing 15, and driving power and a video signal are supplied to the light source 11 and the display element 14.

  For convenience of explanation below, directions are defined as follows. First, an axis that optically connects the center of the display area of the display element 14 and the center of the optical pupil E formed by the eyepiece optical system 16 is an optical axis. The optical axis direction when the optical path from the light source 11 to the optical pupil E is developed is taken as the Z direction. In addition, a direction perpendicular to an incident surface of an optical axis to a hologram optical element 19 to be described later of the eyepiece optical system 16 is defined as an X direction, and a direction perpendicular to the ZX plane is defined as a Y direction. The incident surface of the optical axis to the hologram optical element 19 refers to a plane including the optical axis of incident light and the optical axis of reflected light in the hologram optical element 19, that is, the YZ plane. Hereinafter, the incident surface is simply referred to as an incident surface or an optical axis incident surface. In the present embodiment, positive and negative are not considered in each direction of XYZ.

  The light source 11 illuminates the display element 14. For example, the light source 11 is 462 ± 12 nm (B light), 525 ± 17 nm (G light), 635 ± 11 nm (R It is composed of RGB-integrated LEDs that emit light in three wavelength bands. As described above, the light source 11 emits light having a predetermined wavelength width, whereby the image light obtained by illuminating the display element 14 can have a predetermined wavelength width. When the image light is diffracted, the image can be observed by the observer over the entire observation angle of view at the position of the optical pupil E. Further, the peak wavelength for each color of the light source 11 is set in the vicinity of the peak wavelength of the diffraction efficiency described later of the hologram optical element 19, so that the light use efficiency is improved.

  In addition, since the light source 11 is composed of LEDs that emit RGB light, the light source 11 can be realized at low cost and a color image is displayed on the display element 14 when the display element 14 is illuminated. It becomes possible to provide the observer with the color image. Further, since each LED has a narrow emission wavelength width, the use of a plurality of such LEDs enables high color reproducibility and bright image display.

  The unidirectional diffuser plate 12 diffuses the light emitted from the light source 11, but the degree of diffusion differs depending on the direction. More specifically, the unidirectional diffuser 12 diffuses incident light in the X direction by about 40 ° and diffuses incident light in the Y direction by about 0.5 °. The arrangement of the unidirectional diffuser 12 can be omitted.

  The condensing lens 13 is composed of a cylinder lens that condenses the light diffused by the unidirectional diffusing plate 12 in the Y direction, and is arranged so that the diffused light efficiently forms the optical pupil E. .

  The display element 14 displays an image by modulating the light emitted from the light source 11 in accordance with image data, and is configured by a transmissive liquid crystal display element having pixels in a matrix in which light is transmitted. Has been. The display element 14 is arranged such that the long side direction of the rectangular display region is the X direction and the short side direction is the Y direction. The display element 14 may be a reflective type. As the reflective display element 14, for example, a reflective liquid crystal display element or DMD (Digital Micromirror Device; manufactured by Texas Instruments Inc., USA) can be used.

  The eyepiece optical system 16 is a magnifying optical system that guides the light of the image displayed on the display element 14 to the optical pupil E and provides an enlarged virtual image of the display image of the display element 14 to the observer. A transparent substrate), a deflection prism 18 (second transparent substrate), and a hologram optical element 19.

  The eyepiece prism 17 totally reflects the image light from the display element 14 incident through the surface 17a by the two opposing surfaces 17b and 17c, and guides it to the observer's pupil through the hologram optical element 19, while The light is transmitted and guided to the observer's pupil, and is composed of, for example, an acrylic resin together with the deflecting prism 18. The eyepiece prism 17 is formed in a shape in which the lower end portion of the parallel plate is thinned toward the lower end so as to be wedge-shaped, and the upper end portion thereof is thickened toward the upper end. Further, the eyepiece prism 17 is bonded to the deflection prism 18 with an adhesive so as to sandwich the hologram optical element 19 disposed at the lower end thereof.

  The deflection prism 18 is configured by a substantially U-shaped parallel plate in plan view (see FIGS. 1 and 4), and is bonded to the lower end portion and both side surface portions (left and right end surfaces) of the eyepiece prism 17. The eyepiece prism 17 is integrated into a substantially parallel plate. By joining the deflecting prism 18 to the eyepiece prism 17, it is possible to prevent distortion in the external image observed by the observer via the eyepiece optical system 16.

  That is, for example, when the deflection prism 18 is not joined to the eyepiece prism 17, the external light is refracted when passing through the wedge-shaped lower end of the eyepiece prism 17, so that the external field image observed through the eyepiece prism 17 is distorted. Arise. However, the deflection prism 18 is joined to the eyepiece prism 17 to form an integral substantially parallel plate, so that the deflection when the external light passes through the wedge-shaped lower end of the eyepiece prism 17 is canceled by the deflection prism 18. Can do. As a result, it is possible to prevent distortion in the external image observed through the see-through.

  The two surfaces of the eyepiece prism 17 and the deflection prism 18 facing each other may be flat or curved. In the latter case, the eyepiece optical system 16 can have a function as a correcting eyeglass lens.

  The hologram optical element 19 diffracts and reflects the image light (wavelength light corresponding to the three primary colors) emitted from the display element 14 and guides it to the optical pupil E, and enlarges the image displayed on the display element 14 to observe the image. It is a volume phase type reflection hologram guided as a virtual image to the pupil. The hologram optical element 19 has, for example, three wavelength ranges of 465 ± 5 nm (B light), 521 ± 5 nm (G light), and 634 ± 5 nm (R light) with a peak wavelength of diffraction efficiency and a wavelength width of half the diffraction efficiency. The light is diffracted (reflected). Here, the peak wavelength of diffraction efficiency is the wavelength at which the diffraction efficiency reaches a peak, and the wavelength width at half maximum of the diffraction efficiency is the wavelength width at which the diffraction efficiency is at half the peak of the diffraction efficiency. It is.

  The reflection-type hologram optical element 19 has high wavelength selectivity, and only diffracts and reflects light having a wavelength in the wavelength range (near the exposure wavelength). The hologram optical element 19 is transmitted, and a high external light transmittance can be realized.

  Further, the hologram optical element 19 has an axially asymmetric positive optical power. That is, the hologram optical element 19 has the same function as an aspherical concave mirror having positive power. Thereby, the degree of freedom of arrangement of each optical member constituting the apparatus can be increased, and the apparatus can be easily reduced in size, and an image with good aberration correction can be provided to the observer.

  The housing 15 is configured such that the upper first housing 15a and the lower second housing 15b are fitted and screwed together. The casing 15 may be configured by fitting three or more parts. A packing 4 is provided between the first housing 15 a and the second housing 15 b and between the housing 15 and the eyepiece prism 17. In the packing 4, a first packing 4a located between the housing 15 and the eyepiece prism 17 and a second packing 4b located between the first housing 15a and the second housing 15b are integrally molded. It has been done.

  The first packing 4 a is provided so as to be in contact with the periphery of the eyepiece prism 17 and the housing 15. Specifically, the first packing 4 a is provided in a gap between the housing 15 and the eyepiece prism 17. By this first packing 4a, the gap between the housing 15 and the eyepiece prism 17 is closed, and the waterproofness and dustproofness of that part are ensured.

  A mirror coating 17e is applied to the portion where the first packing 4a is in contact with the eyepiece prism 17 and the image light of the eyepiece prism 17 is reflected. Although not adopted in this embodiment, if there is a part where the casing 15 is in contact with the eyepiece prism 17 and the image light of the eyepiece prism 17 is reflected, a mirror coat is also applied to that part. Good. The mirror coat 17e may be applied to the entire portion of the eyepiece prism 17 where the image light is reflected and included in the housing 15.

  With the mirror coat 17e, the image light is totally reflected and a desired image can be obtained. If the mirror coat 17e is not applied, part of the image light that should be reflected is absorbed by the first packing 4a, and a desired image cannot be obtained. Therefore, the other part of the eyepiece prism 17 where the image light is reflected has a structure in which neither the packing 4 nor the casing 15 is in contact. That is, an air layer is provided in that portion.

  Here, as the material of the mirror coat 17e, silicon dioxide, silicon monoxide, aluminum oxide, zirconium oxide, titanium oxide, cerium oxide, lanthanum oxide, magnesium oxide, tin oxide, tantalum pentoxide, yttrium oxide, zinc oxide, fluorine Magnesium fluoride, lanthanum fluoride, and the like, a mixture of two or more of these, an organic polysiloxane resin, and a mixture thereof can be used.

  The mirror coat 17e is formed by a vacuum deposition method, a sputtering method, an ion plating method, a solution method, or the like. In addition, for the purpose of improving the adhesion of the mirror coat 17e, it is desirable to perform pretreatment such as activated gas treatment, ion treatment, and chemical treatment before film formation.

  Further, it is desirable that the portion of the eyepiece prism 17 included in the housing 15 where the image light is not incident or reflected is black or a similar color. This is because the scattered unnecessary light is absorbed to obtain a clear image.

  Further, grooves 17d and 17d, which are restricting portions for restricting the position of the first packing 4a, are formed on both side surfaces of the eyepiece prism 17. Since the side portion of the first packing 4a is fitted into the groove 17d due to the presence of the groove 17d, positioning of the eyepiece prism 17 during assembly is facilitated, and displacement due to use does not occur. The effect can be obtained if at least one of the grooves 17d is formed. The shape of the restricting portion is not limited to the groove 17d, and may be any shape that can restrict the position of the first packing 4a. For example, the restricting portion may have a single groove shape in which one protrusion of the groove is omitted.

  The 2nd packing 4b is provided along the fitting part of the housing components (here two) which have an external appearance part among several housing components. By this second packing 4b, the gap between the casing parts having the appearance portion is closed, and the waterproofness and dustproofness of the appearance portion are ensured. A bush 5 that holds the cable 3 sandwiched between the first housing 15a and the second housing 15b and is integrally formed with the second packing 4b is fixed while penetrating the cable 3. The bush 5 can prevent the cable 3 from being disconnected due to bending with a small bending radius. Moreover, it becomes a simple structure by integrally molding the bush 5 and the second packing 4b. Note that there is no problem even if the bush 5 is separate from the second packing 4b.

  The packing 4 and the bush 5 are preferably made of an elastic body such as rubber from the viewpoint of easy processability, easy mounting, waterproofness, dustproofness, and the like. Further, as the packing 4, an adhesive or caulking may be used.

  A part of the first packing 4a may be in contact with a portion of the eyepiece prism 17 where the image light is not reflected. FIG. 5 is a cross-sectional view illustrating a schematic configuration of another example of the video display device 1. FIG. 5 differs from FIG. 3 in that the first packing 4 a that contacts the surface 17 c of the eyepiece prism 17 is in contact with a portion of the eyepiece prism 17 where the image light is not reflected.

  In this case, the mirror coating need not be applied to the surface 17c portion of the eyepiece prism 17 with which the first packing 4a contacts. This is because the image light is not reflected. Instead, it is desirable that the part be black or a similar color. This is because the scattered unnecessary light is absorbed to obtain a clear image. It is also effective to make the first packing 4a black or a similar color, or to make the contact surface of the first packing 4a with the eyepiece prism 17 black or a similar color.

  Here, the case where the first packing 4a in contact with the surface 17c of the eyepiece prism 17 is in contact with the portion of the eyepiece prism 17 where the image light is not reflected is illustrated, but the first packing 4a in contact with the surface 17b of the eyepiece prism 17 is illustrated. One packing 4a may be in contact with a portion of the eyepiece prism 17 where the image light is not reflected.

  Next, another form of the housing will be described. 6 is a cross-sectional view showing a schematic configuration of another example of the video display device 1, and FIG. 7 is an exploded perspective view of the video display device 1 of FIG. Below, only a different part from said embodiment is demonstrated, and description is abbreviate | omitted about the same component.

  The casing 15 includes an upper first casing 15a, a lower second casing 15b, an upper third casing 15c that covers them, and a lower fourth casing 15d. The casing 15a and the second casing 15b are fitted, and the third casing 15c and the fourth casing 15d are fitted. Here, the first and second housings 15a and 15b are made of plastic, and the third and fourth housings 15c and 15d are made of an elastic body such as rubber. The third and fourth housings 15c and 15d are provided so as to cover the entire outer surfaces of the first and second housings 15a and 15b. Therefore, the gap between the first and second casings 15a and 15b is covered with the third and fourth casings 15c and 15d, and the waterproofness and dustproofness of the portions are ensured.

  Note that there is no problem even if the third and fourth casings 15c and 15d are provided so as to cover the inner sides of the first and second casings 15a and 15b.

  In addition, the end portions of the first to fourth housings 15a to 15d are in contact with portions around the eyepiece prism 17 where the image light is reflected. Thereby, the clearance gap between the eyepiece prism 17 and the housing | casing 15 is block | closed, and the waterproofness and dustproof property of the part are ensured.

  A mirror coat 17e is applied to the portion of the eyepiece prism 17 that is in contact with the end of the housing 15 and from which the image light of the eyepiece prism 17 is reflected. The mirror coat 17e may be applied to the entire portion of the eyepiece prism 17 where the image light is reflected and included in the housing 15. With the mirror coat 17e, the image light is totally reflected and a desired image can be obtained.

  Further, the bush 5 is separate from the housing 15. In addition, if the bush 5 is integrally formed with the third or fourth housings 15c and 15d, a simple structure can be obtained.

  As described above, by using the packing 4 or the third and fourth casings 15c and 15d, the gap between the casing 15 and the eyepiece prism 17 and the fitting part between the casing components without increasing the size and weight. It is possible to close the gap generated in the water and provide waterproofness and dustproofness.

  Next, the operation of the video display device 1 having the above configuration will be described. The light emitted from the light source 11 is diffused by the unidirectional diffusion plate 12, condensed by the condenser lens 13, and enters the display element 14. The light incident on the display element 14 is modulated for each pixel based on the image data and is emitted as video light. That is, a color image is displayed on the display element 14.

  The image light from the display element 14 enters the eyepiece prism 17 of the eyepiece optical system 16 from its upper end surface (surface 17a), and is totally reflected a plurality of times by the two opposing surfaces 17b and 17c, thereby being a hologram optical element. 19 enters. The light incident on the hologram optical element 19 is reflected there, passes through the surface 17b, and reaches the optical pupil E. At the position of the optical pupil E, the observer can observe an enlarged virtual image of the image displayed on the display element 14.

  On the other hand, the eyepiece prism 17, the deflecting prism 18, and the hologram optical element 19 transmit almost all of the external light, so that the observer can observe the external field image through them. Therefore, the virtual image of the image displayed on the display element 14 is observed while being overlapped with a part of the external image.

  As described above, in the video display device 1, the video light emitted from the display element 14 is guided by total reflection in the eyepiece prism 17 and guided to the observer's pupil via the hologram optical element 19. Similar to the spectacle lens, the thickness of the eyepiece prism 17 and the deflection prism 18 can be about 3 mm, and the video display device 1 can be reduced in size and weight. Further, by using the eyepiece prism 17 that totally reflects the image light from the display element 14, a high external light transmittance can be secured and a bright external image can be provided to the observer.

  Further, the volume phase type reflection type hologram optical element 19 has a narrow diffraction efficiency half-value wavelength width and a high diffraction efficiency. By using such a hologram optical element 19, a color image with high color purity and high brightness can be obtained. In addition to providing high external light transmittance, the observer can observe a bright external image.

  Further, as can be seen from the above description, the hologram optical element 19 functions as a combiner that simultaneously guides the image light from the display element 14 and external light to the observer's pupil. As a result, the observer can simultaneously observe the image provided from the display element 14 and the external image via the hologram optical element 19.

(3. Supporting means)
Next, the support means 2 is demonstrated based on FIG. 1 and FIG.
The support means 2 includes a temple 21 and a frame 22. The temple 21 is composed of a pair of left and right temples 21R and 21L that come into contact with the temporal region of the observer. The frame 22 rotatably supports the temples 21R and 21L and supports the video display device 1 described above, and is formed in a substantially T shape. The temple 21 and the frame 22 are made of resin, for example, and have flexibility. The frame 22 is provided with a pair of left and right nose pads 23 that come into contact with the observer's nose.

In the present embodiment, the temple 21R is configured by integrating a first temple portion 21R ₁ and a second temple portion 21R ₂ . Similarly, the temple 21L includes a first temple portion 21L _1, and a second temple portion 21L ₂ is configured by integrally. The first temple portions 21R ₁ and 21L ₁ and the second temple portions 21R ₂ and 21L ₂ are each formed in a long shape in the front-rear direction, and the second temple portions 21R ₂ and 21L ₂ are the first temple portions. It is formed slightly longer than 21R ₁ · 21L ₁ .

The first temple portions 21R ₁ and 21L ₁ are pivotally connected to the frame 22 at the left and right ends of the frame 22 and are displaced forward with respect to the second temple portions 21R ₂ and 21L ₂ . It is connected so that it may be located in the state above.

The second temple portions 22R ₂ and 21L ₂ are supported by the frame 22 via the first temple portions 21R ₁ and 21L ₁ . The second temple portion 21R ₂ has an earphone holding portion 24 that holds the earphone 25 so as to be movable in the front-rear direction, and the observer holds the earphone 25 in the earphone holding portion 24 (the earphone 25 is heard in the ear). It is possible to listen to the audio even if it is not plugged in.

The second temple portions 22R ₂ and 21L ₂ have exposed surfaces 21R _S and 21L _S that are exposed forward at a height position different from the support position of the first temple portions 21R ₁ and 21L ₁ with respect to the frame 22. Yes. The cable 3 described above passes through the inside of the second temple portion 21R ₂ , for example, and is pulled out from the exposed surface 21R _S and connected to the video display device 1. With such a connection method, the following first to fourth effects can be obtained.

First, since the cable 3 is connected to the video display device 1 once supported by the temple 21R (second temple portion 21R ₂ ), as in the case where the cable 3 is directly connected to the video display device 1. In addition, the weight of the cable 3 is not directly applied to the video display device 1. As a result, even if the observer uses the HMD for a long time, it is possible to avoid an increase in fatigue and discomfort and to reduce the burden on the observer when using the HMD for a long time.

In particular, in the present embodiment, the temple 21R has a two-stage configuration of the first temple portion 21R ₁ and the second temple portion 21R ₂ , so that the position of the temple 21R supported by the frame 22 (first temple portion 21R ₁ and the connecting position) of the frame 22, can be varied to ensure the position of the exposed surface 21R _S in height direction. Accordingly, the cable 3 can be reliably pulled out from the inside of the second temple portion 21R ₂ to the outside through the exposed surface 21R _S in a state where the frame 22 and the first temple portion 21R ₁ are rotatably connected. Thus, it is possible to reliably employ the above connection method.

  Second, since the temple 21R can support the cable 3 in a stable state by abutting the temporal head of the observer, the cable 3 is supported by one temple 21R as in the present embodiment. Even in this case, the observer can stably wear the HMD (the HMD does not wobble from front to back and from side to side).

Third, the cable 3, it means that through different heights from the frame 22 via the exposed surface 21R _S of the temple 21R, during turning of the temple 21R relative to the frame 22, the cable 3 to the rotation part The winding does not hinder the rotation of the temple 21R. Therefore, the temple 21R can be easily folded.

  Fourth, since the cable 3 does not pass through the inside of the frame 22, it is not necessary to form the frame 22 thicker than necessary. Thereby, the frame 22 is easily deformed in accordance with the size of the observer's head, and the observer can wear the HMD stably and without feeling uncomfortable.

As shown in FIG. 2, the cable 3 enters the second temple portion 21R ₂ from a position behind the position where the second temple portion 21R ₂ comes into contact with the ear of the observer. As a result, the cable 3 hangs behind the ears of the observer, so that the weight balance in the front-rear direction with respect to the ears of the observer can be improved, and the usage burden on the observer can be reliably reduced. . In addition, the cable 3 does not obstruct the side view of the observer and obstruct it.

Further, the first temple portion 21R ₁ and the second temple portion 21R ₂ are formed in an elongated shape in the front-rear direction, and the first temple portion 21R ₁ is displaced forward with respect to the second temple portion 21R ₂ . Since the first temple portion 21R ₁ and the second temple portion 21R ₂ are formed to be thin with a minimum necessary thickness (height), the entire temple 21R is made small and lightweight. can do. In addition, when the first temple portion 21R ₁ is rotated with respect to the frame 22, the second temple portion 21R ₂ is folded inward from the first temple portion 21R ₁ , and the second temple portion 21R ₂ is The HMD can be stored compactly without projecting outside.

Further, since the first temple portion 21R ₁ is located above the second temple portion 21R _2, when the HMD is mounted on the observer's head (the second temple portion 21R ₂ is the ear of the observer). When positioned at the top), the first temple portion 21R ₁ is positioned above the observer's eyes. Therefore, the frame 22 connected to the first temple portion 21R ₁ can be positioned above the eyes of the observer at least from the front to the side of the observer, and a wide field of view for the observer can be secured. It becomes. In addition, even when the observer is wearing general glasses, the HMD frame 22 is less likely to interfere with the temples and frames of the glasses, and the combined use of the HMD and glasses is facilitated.

Meanwhile, in the second temple portion 21R ₂ · 21L _2, surface contacting the side of the head of the observer, it is desirable that the planar or substantially planar. In the present embodiment, as shown in FIG. 1, the edged surface along the outer shape of the second temple portions 21R ₂ and 21L ₂ is a flat surface. As a result, the second temple portions 21R ₂ and 21L ₂ have a larger contact area with the observer's temporal region than in the case of line contact, so that the observer can stably wear the HMD. It becomes. Also, a force sandwiching the head is dispersed by the second temple portion 21R ₂ · 21L ₂ of the right and left, the observer can be used for a long time without discomfort HMD.

  The video display device and head-mounted display of the present invention can be used particularly effectively for products used in harsh environments where dustproof and waterproof properties are required, such as outdoors.

1 is a perspective view showing a schematic configuration of an HMD according to an embodiment of the present invention. It is a side view of said HMD in the state where the observer wore. It is sectional drawing which shows the schematic structure of the video display apparatus which said HMD has. It is a disassembled perspective view of the said video display apparatus. It is sectional drawing which shows the schematic structure of the other example of the video display apparatus of this invention. It is sectional drawing which shows the schematic structure of the other example of the video display apparatus of this invention. It is a disassembled perspective view of the said video display apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Image display apparatus 2 Support means 3 Cable 4 Packing 4a 1st packing 4b 2nd packing 14 Display element 15 Case 16 Eyepiece optical system 17 Eyepiece prism (1st transparent substrate)
17e Mirror coat 18 Deflection prism (second transparent substrate)
19 hologram optical element 21 temple 21R temple 21R ₁ first temple part 21R ₂ second temple part 21L temple 21L ₁ first temple part 21L ₂ second temple part 22 frame 23 nose pad

Claims (12)

A display element for displaying an image;
A prism capable of guiding the light of the image displayed on the display element to the optical pupil and transmitting the light to see the outside world;
In a video display device comprising a housing that encloses and holds the display element and a part of the prism,
A first packing is provided so as to contact the periphery of the prism and the casing,
An image display device, wherein a mirror coat is applied to a portion where the casing and / or the first packing is in contact with the prism and where the image light of the prism is reflected.   The video display device according to claim 1, wherein a part of the first packing is in contact with a portion of the prism that does not reflect video light.   The video display device according to claim 1, wherein the first packing is provided in a gap between the casing and the prism.   The video display device according to claim 3, wherein the casing includes a plurality of parts, and a second packing is provided in a fitting portion between the parts having an appearance portion among the plurality of parts. A cable that is electrically connected to the display element and supplies driving power and a video signal;
The cable is penetrated and fixed, and includes a bush that is sandwiched between the casings and holds the cable.
The video display device according to claim 4, wherein the bush and the second packing are integrated. A cable that is electrically connected to the display element and supplies driving power and a video signal;
The cable is penetrated and fixed, and includes a bush that is sandwiched between the casings and holds the cable.
5. The video display device according to claim 4, wherein the bush, the first packing, and the second packing are integrated.   The video display device according to claim 1, wherein a restriction portion for restricting a position of the first packing is formed on the prism. A display element for displaying an image;
A prism capable of guiding the light of the image displayed on the display element to the optical pupil and transmitting the light to see the outside world;
In a video display device comprising a housing that encloses and holds the display element and a part of the prism,
The housing is composed of a plurality of parts, and a part having an appearance portion of the plurality of parts is made of rubber and plastic, and at least a part of the rubber portion is fitted around the prism and the parts having the appearance portion. Touching the part,
An image display apparatus, wherein a mirror coat is applied to a portion where the casing is in contact with the prism and the image light of the prism is reflected. A volume phase hologram optical element;
9. The hologram optical element according to claim 1, wherein image light from the display element is diffracted and reflected and guided to the optical pupil, and at the same time, external light is transmitted and guided to the optical pupil. Video display device. The prism is
A first transparent substrate that totally reflects internal image light from the display element and guides it to the optical pupil, and transmits external light to the optical pupil;
The video display device according to claim 1, further comprising: a second transparent substrate for canceling refraction of external light on the first transparent substrate. The video display device according to any one of claims 1 to 10,
A head-mounted display comprising: support means for supporting the video display device in front of an observer's eyes. The support means is
A pair of left and right temples in contact with the observer's temporal region;
A frame that rotatably supports each temple and a frame that supports the video display device,
The head-mounted display according to claim 11, further comprising a nose pad contacting the nose of the observer.

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