DISPLAY APPARATUS

A display apparatus includes: a first lens barrel in a shape of a bottomed barrel and including, as a bottom portion, a first display device that displays a first image; a second lens barrel in a shape of a bottomed barrel and including, as a bottom portion, a second display device that displays a second image; a support member that supports the first and second lens barrels; and an eye cup that is in a barrel shape and is provided at an open end of each of the first and second lens barrels along the open end. The eye cup includes two or more ventilation paths through which inside and outside of the eye cup communicate with each other in an intersecting direction that intersects a barrel axis direction of the first and second lens barrels and an arrangement direction in which the first and second lens barrels are arranged.

TECHNICAL FIELD

The present disclosure relates to a display apparatus.

BACKGROUND ART

Recent years have seen active developments of head mounted display devices, what is called a head mounted display. For example, Patent Literature (PTL) 1 discloses a head mounted display capable of presenting (i.e., displaying) a video of content and a video of the external world. The head mounted display disclosed in PTL 1 adjusts luminance of at least one of the video of the content and the video of the external world, thus mitigating a sense of incongruity that a user feels when a switch is made between the video of the content and the video of the external world.

CITATION LIST

Patent Literature

SUMMARY OF INVENTION

Technical Problem

A display apparatus such as a head mounted display may be inappropriately configured from the viewpoint of usage by a user.

The present disclosure is made in view of the above, and an object of the present disclosure is to provide a display apparatus that is configured more appropriately.

Solution to Problem

In order to achieve the above object, a display apparatus according to an aspect of the present disclosure is a display apparatus including: a first lens barrel that is in a shape of a bottomed barrel and includes, as a bottom portion, a first display device that displays a first image; a second lens barrel that is in a shape of a bottomed barrel and includes, as a bottom portion, a second display device that displays a second image; a support member that supports the first lens barrel and the second lens barrel; and an eye cup that is in a barrel shape and is provided at an open end of each of the first lens barrel and the second lens barrel, wherein the eye cup includes two or more ventilation paths through which inside and outside of the eye cup communicate with each other in an intersecting direction that intersects (i) a barrel axis direction of the first lens barrel and the second lens barrel and (ii) an arrangement direction in which the first lens barrel and the second lens barrel are arranged.

Advantageous Effects of Invention

The present disclosure provides a display apparatus that is configured more appropriately.

DESCRIPTION OF EMBODIMENTS

(Underlying Knowledge Forming Basis of the Disclosure)

In recent years, there have been developed display apparatuses capable of allowing a user to visually recognize an image displayed on an apparently large screen by placing displays in front of eyes of the user when being worn on the head of the user. Such display apparatuses are called head mounted displays (HMDs), and many head mounted displays have been developed in accordance with a high-resolution, high-performance policy because of their properties allowing an image to be visually recognized on an apparently large screen in perspective. Thus, many head mounted displays have been provided in configurations with large housings. Such a large HMD is not appropriate for use in a public space such as a train, an office, and the open air due to problems of its portability and weight as well as being conspicuous among people.

In view of the above circumstances, the present disclosure provides a glass-type HMD that includes two barrel-shaped housings (hereinafter, referred to also as lens barrels) with which minimum areas of two displays (display devices, etc.) corresponding to right and left eyes of a user are covered so as to increase usability such as portability of the HMD as a display device. Such a glass-type HMD is aesthetically excellent and looks as if a user is wearing large sunglasses. The glass-type HMD is thus expected to be inconspicuous among people and capable of naturally blending with the surroundings.

Here, for such a glass-type HMD, there is a case where pupils of both eyes of a user do not match the positions of displays disposed in two lens barrels, thus failing to display an image appropriately. According to the present disclosure, the two lens barrels are connected together (or supported) in such a manner that the relative distance between the two lens barrels can be changed, by which the two lens barrels can be disposed freely in accordance with the positions of pupils of a user, and right and left images can be displayed appropriately. In this case, the two lens barrels are configured to be movable in a direction in which the lens barrels are arranged. For example, a support member that is elongated in the arrangement direction passes through the lens barrels, so that the two lens barrels are supported by the support member, and at least one of the two lens barrels is configured to be movable by sliding on the support member. Therefore, one of the two lens barrels is configured to be variable in its relative position with respect to the other of the two lens barrels in the arrangement direction.

In the case where the lens barrels are slidably supported by a support member, designing a clearance between the support member and the lens barrels becomes difficult. Specifically, in order to make the lens barrels smoothly slidable on the support member, it is necessary to provide gaps between the support member and the lens barrels. At the same time, if the gaps are large, the lens barrels are enabled to rotate about an axis in the arrangement direction in which the support member extends. If the rotation of the lens barrels is allowed, the barrel axes of the two lens barrels become nonparallel, and a parallel relationship cannot be maintained. If the parallel relationship between the barrel axes cannot be maintained, content that is displayed in the two lens barrels and is established based on slight parallax and the like cannot be displayed properly.

For that reason, in the present disclosure, description will be given of a configuration that can maintain the parallel relationship between barrel axes of two lens barrels by inhibiting the rotation of each lens barrel while allowing the relative positions of the two lens barrels to be changed in the arrangement direction.

In addition, an HMD is a wearable display apparatus and is used in close contact with a user so as to inhibit outside light from entering between displays and eyes of the user as much as possible particularly for eliminating the influence of the outside light. That is, a substantially enclosed space is desirably formed between an HMD and eyes of a user. In such an enclosed space, the humidity in the space increases by moisture that vaporizes from the eyes and skin of a user. Thus, fogging is likely to occur on an optical component forming a wall portion of the space, such as a lens. Accordingly, the present disclosure will also describe a configuration that can deal with this problem.

An HMD is a device that allows content to be visually perceived. However, an HMD according to the present disclosure is capable of presenting content not only with visual stimulus but also audio stimulus in combination.

In some cases, an HMD is used for application for increasing a sense of immersion of a user by controlling the presented content in response to a motion of the user. In this case, the HMD is required to be worn stably on the user with the motion. Accordingly, the present disclosure will also describe a configuration that makes an HMD wearable stably.

Note that general or specific aspects of the present disclosure may be implemented by a system, a method, an integrated circuit, a computer program, or a computer-readable recording medium such as a CD-ROM, or by any combination of systems, methods, integrated circuits, computer programs, and recording media.

Hereinafter, embodiments of the present disclosure will be described with the drawings.

Note that the embodiments described below each illustrate a general or specific example. The numerical values, shapes, materials, constituent elements, the arrangement and connection of the constituent elements, steps, the processing order of the steps, etc., illustrated in the embodiments below are mere examples, and do not intend to limit the scope of the claims. Furthermore, among the constituent elements in the following embodiments, constituent elements not recited in the independent claim will be described as optional constituent elements.

Note that the drawings are not necessarily precise illustrations. In the figures, the same reference signs are given to essentially the same constituent elements, and redundant descriptions are omitted or simplified.

It should be noted that, in the present description, terms indicating a relationship between elements, such as “parallel” and terms indicating a shape of an element, such as “rectangular” as well as numerical values and numerical ranges are not expressions that express stringent meanings but expressions each including a range that is considered to be substantially the same, for example, a discrepancy such as a margin of error on the order of several percent.

In the figures used in the following description, an X axis, a Y axis, and a Z axis that are perpendicular to one another will be used for describing a direction of each element of an HMD. An X-axis direction is a right-left direction of a user wearing an HMD. In particular, the left side as viewed from the user will be defined as a positive side in the X-axis direction.

A Y-axis direction is a front-rear direction of a user wearing an HMD. In particular, the rear side as viewed from the user will be defined as a positive side in the Y-axis direction. A Z-axis direction is an up-down direction of a user wearing an HMD. In particular, the upper side as viewed from the user will be defined as a positive side in the Z-axis direction.

The X-axis direction matches an arrangement direction of two lens barrels that are included in an HMD in an embodiment and are arranged corresponding to right and left eyes of a user. The Y-axis direction is a direction parallel to a barrel axis (or a central axis) direction of lens barrels of the HMD according to the embodiment. A plane passing through the central axis of each of the two lens barrels will be referred to as an arrangement plane of lens barrels (or simply an arrangement plane). The arrangement plane is a plane that is normally parallel to a YX plane. The Z-axis direction, which is perpendicular to the arrangement plane, may be called a height direction.

Hereinafter, the right-left direction, the front-rear direction, and the up-down direction described above, and the barrel axis direction, the central axis direction, the arrangement direction, the arrangement plane, and the height direction described above may be used in the description without specific notice. Note that the expression of these directions and the like is used for the sake of convenience in the description and should not be construed as limiting the attitude of an HMD in use.

In the following description, some elements may be denoted with names including numbers such as “first” and “second”. However, the numbers do not mean an order or priority. These numbers are given simply for identifying each constituent element. Therefore, for example, the description may be read with “first” and “second” interchanged or with other numbers such as “third” and “fourth” applied in place of “first” and “second”.

Many configurations in the HMD according to the present embodiment have structures that are in bilaterally symmetric combination. Therefore, the description of some configurations may be given only of one of bilateral combination, and the description of the other may be omitted.

Embodiment

First, a basic configuration of an HMD in an embodiment will be described with reference toFIG.1toFIG.4.FIG.1is a perspective view of a head mounted display according to the embodiment.

As illustrated inFIG.1, HMD100according to the embodiment includes first lens barrel10, second lens barrel20, adjusting mechanism31, support member41, first temple part15, second temple part25, first eye cup14, and second eye cup24.

First lens barrel10is a display module for a single eye that displays, for example, an image for a left eye of user99(seeFIG.9described later). First lens barrel10is formed by assembling resin and metallic materials. First lens barrel10includes therein a first display device (part of display device30inFIG.4described later) that displays a first image for one of eyes (the left eye in this case) of user99and a first convex lens (part of convex lens40inFIG.4described later) that enlarges an image displayed on the first display device. Specifically, first lens barrel10is in a shape of a bottomed barrel and includes the first display device as its bottom portion.

First lens barrel10is constituted by first main portion11, first sub portion12, and first panel13. As illustrated in the figure, first lens barrel10has a double-bottom structure that is constituted by first main portion11, first sub portion12, and first panel13. As illustrated in the figure, first main portion11, first sub portion12, and first panel13are formed of different members. In the following description, first lens barrel10will be described as having a structure in a shape of a bottomed barrel having a double bottom. However, first lens barrel10in the HMD according to the present disclosure may be in a shape of a bottomed barrel with a single bottom simply constituted only by first main portion11. There is no particular limitation on the configuration of such a bottom of first lens barrel10. The HMD can be provided with a configuration having a plurality of bottoms accommodating a plurality of functional units.

The first display device and the first convex lens are disposed inside first main portion11, which is in a shape of a barrel opened toward the positive side in the Y-axis direction. Note that the first convex lens may be formed of one lens or may be formed by assembling two or more lenses. In other words, the first convex lens may be a lens unit including a plurality of lenses.

Second lens barrel20is a display module for a single eye that displays, for example, an image for a right eye of user99. Second lens barrel20is formed by assembling resin and metallic materials. Second lens barrel20includes therein a second display device (part of display device30inFIG.4described later) that displays a second image for the other of the eyes (the right eye in this case) of user99and a second convex lens (part of convex lens40inFIG.4described later) that enlarges an image displayed on the second display device. Specifically, second lens barrel20is in a shape of a bottomed barrel and includes the second display device as its bottom portion.

Second lens barrel20is constituted by second main portion21, second sub portion22, and second panel23. The second display device and the second convex lens are disposed inside second main portion21, which is in a shape of a barrel opened toward the positive side in the Y-axis direction.

First lens barrel10and second lens barrel20are connected to each other by adjusting mechanism31and support member41.

Support member41is a rod-shaped member that is elongated in the arrangement direction and of which an outer diameter is smaller than inner diameters of first through-hole11aformed in first lens barrel10and second through-hole21aformed in second lens barrel20. For example, support member41is formed of metallic material such as aluminum and stainless steel. Support member41may be formed of resin that has sufficient strength and durability. Support member41is inserted into first through-hole11aand second through-hole21a. As a result, support member41passes through first lens barrel10and second lens barrel20in the arrangement direction. The positional relationship between first lens barrel10and second lens barrel20is changed based on a length of the insertion of support member41into first through-hole11aand second through-hole21a.

Here, with reference toFIG.2, the relation among support member41, and first lens barrel10and second lens barrel20will be further described.FIG.2is an enlarged sectional view taken along line ii-ii illustrated inFIG.1, illustrating part of the first lens barrel in an enlarged manner.

As illustrated inFIG.2, in HMD100according to the present embodiment, frame42, member46that is used for supporting convex lens40, and member47for attaching eye cup14are attached to first main portion11. Frame42is formed of metallic material such as aluminum and stainless steel. Frame42may be formed of resin that has sufficient strength and durability. Frame42is fixed to first main portion11in a region not illustrated, reinforces entire first lens barrel10from the inside of first lens barrel10, and is used for fixing members constituting first lens barrel10. First through-hole11apasses through the inside and outside of the barrel shape of first main portion11and passes through frame42in the X-axis direction. Of first through-hole11a, a portion related to frame42will be referred to as frame through-hole42a. First through-hole11ais formed by making frame through-hole42aand a portion that passes through the inside and outside of the barrel shape of first main portion11communicate with each other.

In the present embodiment, support member41includes first component41athat is elongated in the X-axis direction and has a U-shape section and second component41bthat is elongated in the X-axis direction and has a U-shape section of a size capable of accommodating first component41a. As illustrated in the figure, by assembling first component41aand second component41btogether, support member41is formed with an internal space that is elongated in the X-axis direction. For example, the internal space accommodates internal wiring41cas illustrated as a circular section in the figure.

As in HMD100according to the present embodiment, support member41is one of limited components that connect first lens barrel10and second lens barrel20and thus is used for disposing a component for communication necessary between first lens barrel10and second lens barrel20, such as internal wiring41cdescribed above. Further, similar internal wiring may be accommodated in a space that is provided inside adjusting mechanism31. A wire member used for the wiring is a component that disfigures the HMD when disposed at a location visible as its appearance, and is a component that has the risk of disconnection or the like. Therefore, by accommodating the wire member inside another component in this manner, the disfigurement can be avoided, and in addition, the possibility of functional breakage such as disconnection can be decreased.

Here, a gap is formed between support member41and frame through-hole42a. Slider45is disposed such that the gap is filled with slider45. Slider45is made of a resin material having lubricity, such as polyacetal, and retains support member41slidably with respect to frame through-hole42a.

In the present embodiment, slider45is pressed from outside to be deformed, thereby clamping support member41and producing friction between slider45and frame through-hole42a. As a result, when slider45is pressed from outside, sliding between frame42and support member41is inhibited, and in addition, the rotation of frame42about an axis parallel to the X-axis direction with respect to support member41is inhibited. That is, the rotation of first lens barrel10about the X axis with respect to support member41is inhibited.

To press slider45from outside, screw member43and pressure dispersion plate44are used. Screw member43is formed of a metallic material such as aluminum and stainless steel and gives pressing force to slider45when screwed into threaded hole42bformed in frame42. Pressure dispersion plate44is formed of a metallic material such as aluminum and stainless steel and inhibits screw member43from pressing slider45directly when screw member43is screwed into threaded hole42b. Further, pressure dispersion plate44adjusts a direction of the pressing force given by screw member43, thus regulating a direction in which slider45is deformed.

The course from giving the pressing force by screw member43to the deformation of slider45will be described below more in detail. When screwed into threaded hole42b, screw member43advances toward a negative side in the Y-axis direction. A thread of screw member43meshes with a thread of threaded hole42b, and thus screw member43maintains its depth of screwing without being pushed back toward the positive side in the Y-axis direction by stress of slider45and the like. As a result, pressure dispersion plate44is given pressing force based on the depth of screwing of screw member43.

By the pressing force from screw member43, pressure dispersion plate44moves toward the negative side in the Y-axis direction. Pressure dispersion plate44includes an XZ plate that extends along a plane intersecting a direction of the pressing (i.e., an XZ plane) so as to disperse the pressing force from screw member43, as illustrated in the figure. Pressure dispersion plate44also includes an XY plate that extends along an XY plane intersecting the XZ plane so that pressure dispersion plate44is inhibited from inclining in a direction in which the pressing force deviates, that is, so that the XZ plate does not intersect the XZ plane.

The XY plate is inserted between an end surface of slider45on the positive side in the Z-axis direction and an inner surface of frame through-hole42aon the positive side in the Z-axis direction, thereby being inhibited from moving in the Z-axis direction. Of inclinations of the XZ plate in the direction in which the pressing force from screw member43deviates, an inclination in which the XZ plate rotates about the X axis as a rotation axis requires a movement of the XY plate in the Z-axis direction. Therefore, the inhibition of the XY plate from moving in the Z-axis direction as described above inhibits the inclination in which the XZ plate rotates about the X axis as a rotation axis.

The XZ plate extends between an end surface of slider45on the positive side in the Y-axis direction and an inner surface of frame through-hole42aon the positive side in the Y-axis direction, thereby being inhibited from moving in the Y-axis direction. Of inclinations of the XZ plate in the direction in which the pressing force from screw member43deviates, an inclination in which the XZ plate rotates about the Z axis as a rotation axis requires a movement of the XZ plate in the Y-axis direction. Therefore, the inhibition of the XZ plate from moving in the Y-axis direction as described above inhibits the inclination in which the XZ plate rotates about the Z axis as a rotation axis.

In this manner, with pressure dispersion plate44, the pressing force from screw member43presses slider45from the positive side toward negative side in the Y-axis direction with the direction of the pressing force being maintained. Note that, in this case, the pressing force from screw member43has a magnitude that depends on an area of a tip of screw member43in the direction of screwing. If pressure dispersion plate44is absent, the above-described pressing force can break slider45, which is relatively soft. Pressure dispersion plate44inhibits such a breakage of slider45by dispersing, on the XZ plane, an area on which the pressing force from screw member43acts.

Slider45is formed in such a manner as to substantially surround support member41with slider45in the section in the FIG. and to cover support member41with slider45. To be precise, slider is opened at a portion in the Y-axis direction at its end portion on the positive side in the Z-axis direction and is allowed to be deformed by the size of the opening. Further, slider45is formed with recessed portion45athat is recessed outward, at a portion of an inner side facing support member41with which the positive side of support member41in the Y-axis direction is covered. Recessed portion45aextends along the X-axis direction, forming a thin-wall portion extending along the X-axis direction in slider45. By providing the thin-wall portion, which is easily deformed relative to the other portion, a mode of the deformation of slider45is regulated such that the deformation occurs in the vicinity of the thin-wall portion.

The XZ plate described above is formed in such a manner as to be disconnected on a positive side of recessed portion45ain the Z-axis direction. The pressing force from screw member43presses a portion of slider45upper than recessed portion45atoward the negative side in the Y-axis direction. Slider45is further formed with projecting portions45bthat project outward, at a portion of slider45with which support member41is covered on its positive side in the Y-axis direction and at a portion in the vicinity of recessed portion45a. As a result, the pressing by the XZ plate first presses projecting portions45b.

Since projecting portions45bare formed in the vicinity of recessed portion45a, the pressing against projecting portions45bsignificantly causes the deformation of the thin-wall portion corresponding to recessed portion45a. Specifically, a portion of slider45that is on the positive side in the Y-axis direction and upper than recessed portion45apivots on a pivot axis that is parallel to the X-axis direction and passes through the thin-wall portion, as illustrated by a solid-white arrow in the figure.

The pivoting portion of slider45presses support member41in a direction of the pivot. Of the pivoting portion of slider45, a surface on the support member41side is formed with projecting portions45cthat project toward support member41. That is, pressing force of the pressing against support member41by the pivoting portion of slider45is concentrated onto projecting portions45c. As a result, slider45strongly presses support member41, thus inhibiting sliding between support member41and slider45. The deformation of slider acts in such a manner as to fill a gap around support member41, thus inhibiting support member41from rotating about an axis in the X-axis direction with respect to frame42.

In this manner, relative movements between support member41and slider45, between: slider45; and pressure dispersion plate44and frame through-hole42a, between pressure dispersion plate44and screw member43, and between screw member43and threaded hole42bare inhibited. As a result, support member41is pressed against first lens barrel10, inhibiting the relative movement. That is, first lens barrel10is inhibited from rotating and sliding with respect to support member41.

Note that the degrees of inhibition of the relative movements can be adjusted by changing the pressing force by screw member43. As seen from the above, screw member43, threaded hole42b, pressure dispersion plate44, and slider45form an example of a pressing mechanism that presses support member41in a direction intersecting the arrangement direction. In particular, screw member43and threaded hole42bform an example of an adjuster that allows the adjustment of the pressing force for pressing support member41. The depth of screwing of screw member43is adjusted with adjustment hole48and adjustment hole49that are provided in member46and member47, respectively. In the case where such adjustment holes are not provided, the depth of screwing of screw member43may be adjusted before member46and member47are mounted in the assembly of HMD100before its shipment.

One or more pressing mechanisms and the like described above are provided in first lens barrel10. Two or more pressing mechanisms and the like may be provided in first lens barrel10so as to further increase the pressing force. For example, pressing mechanisms and the like may be provided in vicinities of both openings of first through-hole11a. The same configuration is provided in second lens barrel20. A pressing mechanism and the like having the same configuration in a bilateral symmetry is provided in second lens barrel20, and therefore, description of the pressing mechanism and the like provided in second lens barrel20is dispensed with by reading the description of the pressing mechanism and the like provided in first lens barrel10with the positive side and the negative side in the X-axis direction interchanged.

Referring back toFIG.1, the description of the configuration of HMD100will be resumed. Here, part (a) ofFIG.1is a sectional view taken along line a-a in the figure, illustrating adjusting mechanism31and the vicinity of adjusting mechanism31. As illustrated in part (a) ofFIG.1, adjusting mechanism31provided between first lens barrel10and second lens barrel20includes adjusting member32that is elongated in the X-axis direction, threaded hole36that is embedded in first lens barrel10and has a thread groove in a first helical shape, and threaded hole35that is embedded in second lens barrel20and has a thread groove in a second helical shape. Adjusting member32is threaded at its both end portions in the X-axis direction. Specifically, adjusting member32includes, at its one end on the positive side in the X-axis direction, thread portion34formed with a thread in the first helical shape and includes, at the other end on the negative side in the X-axis direction, thread portion33formed with a thread in the second helical shape.

Thread portion34is screwed into threaded hole36embedded in first lens barrel10, and thread portion34is inserted or removed into or from threaded hole36by rotating adjusting member32about an axis parallel to the X-axis direction. Thread portion33is screwed into threaded hole35embedded in second lens barrel20, and thread portion33is inserted or removed into or from threaded hole35by rotating adjusting member32about an axis parallel to the X-axis direction.

These threaded holes are provided in, for example, first sub portion12of first lens barrel10and second sub portion22of second lens barrel20. In particular, providing the threaded hole on the inner side of first sub portion12or second sub portion22from a surface of first sub portion12or second sub portion22by a sufficient length makes it difficult for the thread portion to project from first sub portion12or second sub portion22when the thread portion is inserted or removed. This makes HMD100aesthetically excellent and additionally inhibits the occurrence of a malfunction of adjusting mechanism31due to the intrusion of a foreign object.

Adjusting member32is equipped, in the vicinity of its central portion in its longitudinal direction, with knob member32afor improving the operability of adjusting member32. Knob member32ais a member in a shape of a barrel, and the inner diameter of knob member32amatches the outer diameter of adjusting member32. Accordingly, knob member32ais fixed by, for example, press-fitting adjusting member32into knob member32a, and adjusting member32becomes thicker by the thickness of knob member32a. This improves the operability of rotating adjusting member32.

Here, knob member32ais constituted by two members divided into two in the X-axis direction, with fixing member411interposed therebetween. Fixing member411has an insertion hole of which the inner diameter is sufficiently larger than the outer diameter of adjusting member32(i.e., a gap is provided at least not to bring fixing member411and adjusting member32into contact with each other). Adjusting member32is inserted into the insertion hole of fixing member411, and the two members of knob member32aare press-fitted in such a manner as to sandwich fixing member411from both sides of fixing member411in the X-axis direction.

Accordingly, adjusting member32is rotatable about the axis parallel to the X-axis direction even in a state of being inserted into fixing member411, and the contact of knob member32awith fixing member411fixes the relative position of adjusting member32with respect to fixing member411in the X-axis direction. Further, since adjusting member32are inserted into the insertion hole of fixing member411, the relative movement of adjusting member32with respect to fixing member411is restricted also in the Z-axis direction and the Y-axis direction.

Part (b) ofFIG.1is an enlarged top view of fixing member411and the vicinity of fixing member411as viewed from the positive side in the Z-axis direction in an enlarged manner. In the figure, of constituent elements in the vicinity of fixing member411, support member41and adjusting member32are illustrated with solid lines, and other constituent elements are illustrated with broken lines for distinguishing purposes. As illustrated in part (b) ofFIG.1, fixing member411are joined to support member41to be integrated together. That is, fixing member411is configured to be relatively immovable with respect to support member41.

Fixing member411therefore fix the relative position of adjusting member32with respect to support member41in the X-axis direction. If such a fixing mechanism is absent, for example, when the relative position between first lens barrel10and second lens barrel20is changed by releasing the above-described pressing mechanism and handling adjusting member32, first lens barrel10and second lens barrel20may be moved together with adjusting mechanism31in one of directions in the X-axis direction.

The fixing mechanism fixes the relative position of adjusting member32with respect to support member41in the X-axis direction, thus inhibiting first lens barrel10and second lens barrel20from being moved together with adjusting mechanism31in one of directions in the X-axis direction. This makes it easy to change the relative position between first lens barrel10and second lens barrel20, facilitating the adjustment of the positions of lens barrels for user99. The position of knob member32amay be fixed at a position shifted from the center of adjusting member32to support a case where the position of the eyes of user99are in left-right asymmetry.

Knob member32ais not indispensable in this configuration. For example, the same advantageous effect can be provided with a configuration in which only a recessed portion or a projecting portion for inhibiting fixing member411from moving in the X-axis direction is provided. Further, in order to provide the advantageous effect, it suffices that only the relative position between fixing member411and adjusting member32in the X-axis direction is fixed. Accordingly, as the fixing member, a U-shaped member of which an insertion hole provided as in fixing member411described above is opened toward the negative side in the Y-axis direction, a protrusion-shaped member configured only to be hooked between the two members of knob member32a, or the like can be used.

First temple part15has a front end portion that is connected to a one end portion of support member41on the positive side in the X-axis direction and has a rear end portion that is to be hung on, for example, a left ear of user99. First temple part15is formed of resin and metal in combination. First temple part15is formed by connecting first front temple part18on a front end side of first temple part15and first rear temple part16on a rear end side of first temple part15together pivotably via hinge portion17. Hinge portion17includes a rod-shaped member that serves as a pivot shaft, a connection member that connects first front temple part18pivotably to the rod-shaped member, and a connection member that connects first rear temple part16pivotably to the rod-shaped member.

First front temple part18is provided with cover19on its front end side. Cover19will be described below together with an internal configuration with reference toFIG.3.FIG.3is a diagram for describing a configuration of the inside of the cover of the head mounted display according to the embodiment.FIG.3illustrates a configuration of first front temple part18with cover19removed and the vicinity of first front temple part18as viewed from the same point of view as with HMD100illustrated inFIG.1.

As illustrated inFIG.3, first imaging device51is disposed on a portion of first front temple part18that is covered with cover19. First imaging device51is a camera for generating a peripheral image of HMD100. More specifically, first imaging device51receives reflected light of infrared light emitted from infrared light source52with light receiving elements of first imaging device51arranged in a two-dimensional pattern and generates an infrared image. The infrared image generated by first imaging device51is used for detecting changes in the attitude of HMD100. For example, pattern matching is performed on an object in an infrared image generated by first imaging device51at a first time point and an object in an infrared image generated by first imaging device51at a second time point. This enables the calculation of how the attitude of HMD100has changed based on to what position the object has moved from the first time point to the second time point.

In such a process, an object is desirably recognized three-dimensionally. For that reason, a second imaging device that is the same as first imaging device51is disposed inside cover29of second front temple part28of HMD100to be described later. From infrared images generated by first imaging device51and the second imaging device, an object can be recognized three-dimensionally based on the parallax between first imaging device51and the second imaging device. For the three-dimensional recognition of an object using parallax, the relative position between first imaging device51and the second imaging device is desirably fixed.

In HMD100according to the present embodiment, first imaging device51and the second imaging device are respectively disposed on first temple part15and second temple part25that are fixedly connected to both ends of support member41. This fixes the relative position between first imaging device51and the second imaging device, enabling satisfactory calculation of changes in the attitude of HMD100.

First imaging device51and the second imaging device described above may further generate visible light images. When the visible light images generated by first imaging device51and the second imaging device are displayed on a display disposed in first lens barrel10and on a display disposed in second lens barrel20, respectively, user99can visually recognize the external world of HMD100. At this time, in a case where first imaging device51and the second imaging device have optical axes that differ from a forward direction of user99, image processing for correcting the axes may be performed before the visible light images are displayed on the displays. This mitigates a sense of incongruity caused by a change in sight in wearing HMD100, allowing user99to feel as if user99is not wearing HMD100.

In HMD100illustrated inFIG.3, first panel13of first lens barrel10is further removed, exposing an internal configuration of first panel13. Here, inside first panel13, first sound pickup device53and second sound pickup device54are disposed. First sound pickup device53and second sound pickup device54are disposed such that first sound pickup device53and second sound pickup device54collect sound entering through a gap between first panel13and first sub portion12after first panel13is attached. This makes these sound pickup devices difficult to be seen from the outside of HMD100, and thus HMD100that is aesthetically excellent can be provided. In second lens barrel20, a third sound pickup device and a fourth sound pickup device are disposed such that the third sound pickup device and the fourth sound pickup device, and first sound pickup device53and second sound pickup device54are bilaterally symmetric.

As illustrated in the figure, fifth sound pickup device55is disposed in first temple part15, particularly in first front temple part18. Fifth sound pickup device55is disposed such that fifth sound pickup device55collects, for example, sound that comes through a sound collection hole that is formed in a surface at a lower portion of first front temple part18. This makes fifth sound pickup device55difficult to be seen from the outside of HMD100, and thus HMD100that is aesthetically excellent can be provided. In second lens barrel20, a sixth sound pickup device is disposed such that the sixth sound pickup device and fifth sound pickup device55are bilaterally symmetric. The six sound pickup devices described above are each configured to collect ultrasound that is generated based on a specific frequency, period, timing, or the like (will be referred to also as specific ultrasound).

When using HMD100, user99may hold, in right and left hands, controllers in each of which a transmitter generating the specific ultrasound is built in. In this case, by collecting specific ultrasounds generated from the controllers with the six sound pickup devices, the relative positions of the controllers with respect to HMD100can be calculated from a phase differences, arrival times, or the like. Since the controllers are held by the right and left hands of user99, the motions of the hands of user99can be detected from the relative positions of the controllers. In this manner, HMD100can perform a process of, for example, making an input to content (e.g., changing a video displayed on the displays) based on the positions of the hands of user99.

The above-described six sound pickup devices are preferably disposed away from one another. There are however restrictions on the disposition of the sound pickup devices because HMD100has a configuration in which the two lens barrels are supported by rod-shaped support member41in relation to wearability for user99and appearance properties. For that reason, in HMD100, first sound pickup device53and second sound pickup device54are disposed at a lower end of first lens barrel10and an end portion of first lens barrel10on an opposite side to second lens barrel20. In second lens barrel20, the third sound pickup device and the fourth sound pickup device are disposed in the same disposition in a bilateral symmetry.

While four of the above-described sound pickup devices are arranged on substantially the same plane parallel to the XZ plane, fifth sound pickup device55is disposed in first front temple part18in such a manner as to be disposed at a position off the same plane. The sixth sound pickup device is similarly disposed in second front temple part28. As seen from the above, the six sound pickup devices are disposed in such a manner as to be spaced away from one another within the limited constituent elements of HMD100.

First temple part15can be bent by first rear temple part16pivoting with respect to first front temple part18about an axis parallel to the Z axis in the figure. First temple part15is configured to be bent only in a direction of approaching second temple part25described later (counterclockwise as viewed from the positive side in the Z-axis direction) and is configured not to be pivoted in the opposite direction. This improves the ease of hanging first temple part15on ear96of user99(seeFIG.9described later).

Second temple part25has a front end portion that is connected to the other end portion of support member41on the negative side in the X-axis direction and has a rear end portion that is to be hung on, for example, a right ear of user99. Second temple part25is formed of resin and metal in combination. Second temple part25is formed by connecting second front temple part28on a front end side of second temple part25and second rear temple part26on a rear end side of second temple part25together pivotably via hinge portion27. Hinge portion27includes a rod-shaped member that serves as a pivot shaft, a connection member that connects second front temple part28pivotably to the rod-shaped member, and a connection member that connects second rear temple part26pivotably to the rod-shaped member.

Second front temple part28is provided with cover29on its front end side. Cover29will be described later together with the description of cover19. To second rear temple part26, wiring71for connecting HMD100and external devices is connected.

Wiring71is connected to second temple part25and linked to internal wiring67that passes through second rear temple part26, hinge portion27, and second front temple part28(seeFIG.8Cdescribed later). Internal wiring67further passes through a space between first component41aand second component41bof support member41, extending to second lens barrel20and first lens barrel10. That is, internal wiring67is integrated with internal wiring41cdescribed above. Wiring71is therefore electrically connected to internal wiring41cdescribed above. Wiring71is supplied, from the external devices, with electric power for driving HMD100and signal information that represents content to be presented to user99with HMD100.

Second temple part25can be bent by second rear temple part26pivoting with respect to second front temple part28about an axis parallel to the Z axis in the figure. Second temple part25is configured to be bent only in a direction of approaching first temple part15described above (clockwise as viewed from the positive side in the Z-axis direction) and is configured not to be pivoted in the opposite direction. This improves the ease of hanging second temple part25on ear96of user99.

As illustrated inFIG.1, first temple part15and second temple part25are curved in such a manner that rear ends of first temple part15and second temple part25approach each other. In other words, the temple parts are curved toward the inside of HMD100where the head of user99is located. This causes first temple part and second temple part25to press the back of the head of user99inward and forward, pulling first lens barrel10and second lens barrel20such that first lens barrel10and second lens barrel20are pushed against the head of user99. The curved shapes of first temple part15and second temple part25therefore inhibit worn HMD100from dropping off, contributing to improvement in wearability.

First eye cup14is a member in a barrel shape that is interposed between first lens barrel10and the head of user99. First eye cup14is removably attached to first lens barrel10. For example, in a case where HMD100is shared with a plurality of users99, only replacement of first eye cup14inhibits indirect contact between users99via first lens barrel10. First eye cup14is attached by inserting first eye cup14from an opening side of first main portion11of first lens barrel10toward the negative side in the Y-axis direction. As a result, first eye cup14projects outward of an opening end of first lens barrel10(i.e., toward user99) and is provided along the opening end. As seen from the above, first eye cup14, which is a main object that comes into contact with user99, can be removed and, for example, washed. Therefore, HMD100can be kept clean without washing whole HMD100.

Second eye cup24is a member in a barrel shape that is interposed between second lens barrel20and the head of user99. Second eye cup24is removably attached to second lens barrel20. For example, in a case where HMD100is shared with a plurality of users99, only replacement of second eye cup24inhibits indirect contact between users99via second lens barrel20. Second eye cup24is attached by inserting second eye cup24from an opening side of second main portion21of second lens barrel20toward the negative side in the Y-axis direction. As a result, second eye cup24projects outward of an opening end of second lens barrel20(i.e., toward user99) and is provided along the opening end. As seen from the above, second eye cup24, which is a main object that comes into contact with user99, can be removed and, for example, washed. Therefore, HMD100can be kept clean without washing whole HMD100.

Note that the barrel shapes of first eye cup14and second eye cup24described above are not necessarily a perfect barrel. For example, the barrel shapes may be in a curved plate shape or the like that is partly opened as viewed in its barrel axis direction. However, these eye cups desirably have a shape with which a space between HMD100and the eyes of user99are widely covered to deliver light from the displays of HMD100to the eyes of user99under reduced influence of outside light. For that reason, first eye cup14and second eye cup24according to the present embodiment are in barrel shapes that encompass the opening ends of first lens barrel10and second lens barrel20, respectively.

With reference toFIG.4, the functional configuration of HMD100according to the present embodiment will be described below.FIG.4is a block diagram of the functional configuration of a display system including the head mounted display according to the embodiment.

To HMD100, power source91and signal processing circuit92are connected via connector75and plug75a. Power source91and signal processing circuit92are external devices connected to HMD100.

Power source91is a device that supplies electric power for HMD100to perform various types of operation. Power source91is, for example, an AC-DC converter that converts household AC electric power to generate DC electric power of a voltage necessary for the operation of HMD100. Power source91may be, for example, a battery that discharges accumulated electric power as DC electric power, a solar battery that supplies electric power generated from solar energy, or the like. Power source91as a battery may be built in HMD100, or power source91as a solar battery may be attached to an outer surface of HMD100. In HMD100, the electric power supply may be performed by wireless transmission, without the use of plug75aand connector75.

Signal processing circuit92is a device that supplies, to HMD100, image information that represents an image to be displayed through communication. Signal processing circuit92supplies the image information in the form of a digital signal but may supply the image information in the form of an analog signal. Alternatively, the image information may be stored in HMD100, and the image may be displayed off-line, with plug75aand connector75being disconnected. Alternatively, the image information generated in real time may be supplied successively to HMD100and displayed on-line, with the connection to plug75aand connector75maintained. Alternatively, such image information may be also supplied through wireless communication.

As illustrated inFIG.1, wiring71provided with, at its tip, connector75for performing at least one of the communication or the electric power supply described above is connected to second temple part25in the vicinity of the right ear of user99at the time of wearing HMD100. Wiring71extends rearward of the right ear. For example, second rear temple part26of HMD100is connected to connector box72provided with connector75via wiring71, which is designed to have a length of about 10 cm to 15 cm, from the viewpoint of positional graspability and handling.

FIG.5is a peripheral view of a connector box of the head mounted display according to the embodiment. Connector box72is an operator of HMD100provided with connector75. Connector box72is provided with operation buttons that receive an input for operating HMD100from user99. Specifically, as illustrated in the figure, connector box72is provided with volume turning-up operating button73a, power switching button73b, and volume turning-down operating button73c.

When user99presses volume turning-up operating button73a, the volume of sound being played back in accordance with the content displayed on HMD100is turned up based on the number of times of pressing volume turning-up operating button73a. When user99presses power switching button73b, on and off of the power source of HMD100are switched. That is, in order to start HMD100to operate, it is necessary to supply electric power via connector75and perform an operation of turning on the power source of HMD100by pressing power switching button73b. When user99presses volume turning-down operating button73c, the volume of sound being played back in accordance with the content displayed on HMD100is turned down based on the number of times of pressing volume turning-down operating button73c.

HMD100has a configuration for emitting sound that is played back in accordance with the content displayed. For example, connector box72is provided with audio jack74. Audio jack74is supplied with, for example, a signal of sound to be played back in accordance with the content that is acquired from signal processing circuit92via connector75. When audio plug74alinked to given earphones, speakers, or the like is inserted into audio jack74, the sound to be played back in accordance with the content is emitted via the earphones, speakers, or the like.

Plug75aconnected to connector75may be, for example, a conversion plug. Plug75ais a plug of a universal type that is capable of implementing various signals and electric power with a plug in one shape. However, there is a case where a signal of content or the like is output to HMD100from signal processing circuit92that is not capable of outputting a signal that conforms to such a plug shape. In this case, connector75may be connected to a conversion plug that is capable of receiving an input of a signal with a different plug shape and performs a signal conversion process on the signal and capable of outputting a signal converted for a shape conforming to the plug shape of plug75a(i.e., conforming to connector75).

Referring back toFIG.4, the description of the functional configuration of HMD100will be resumed. The electric power and the image information supplied from the external devices are transferred to drive circuit38via internal wiring41cand the like. In more detail, the image information is transferred to drive circuit38via processor38aas illustrated inFIG.4. Processor38ais a processing device that processes image information for displaying on display device30of HMD100to convert the image information into an analog signal and performs various processes of image adjustment. Processor38ais implemented by a processor, a memory, and a program for image processing that is stored in the memory.

In this manner, displaying an image on display device30based on the image information that reaches drive circuit38in the form of an analog signal. Specifically, display panel39is driven by drive circuit38and emit light representing an image. The light is concentrated by convex lens40and visually recognized with eye95of user99.

Drive circuit38is a circuit device for driving display panel39. Display panel39is a device such as a liquid crystal panel, an organic EL panel, and a micro LED panel. Note that, in place of display device30with such drive circuit38and display panel39, a laser projector of a retinal projection type or the like may be used as display device30.

Next, the configuration of the eye cups according to the present embodiment will be described.FIG.6Ais a perspective view illustrating the eye cup of the head mounted display according to the embodiment.FIG.6Bis a top view illustrating the eye cup of the head mounted display according to the embodiment.FIG.6AandFIG.6Billustrate first eye cup14. Second eye cup24has the same configuration as first eye cup14except that they are in a bilateral symmetry, and thus the description of second eye cup24will be omitted. InFIG.6A, the illustration of second member14iiof first eye cup14is omitted.

In first lens barrel10, first eye cup14inhibits direct contact between user99and first lens barrel10. First eye cup14is configured such that one of the eyes of a user is covered with first eye cup14. First eye cup14is interposed between user99and first lens barrel10and is configured in such a manner as to fill a space between user99and first lens barrel10. First eye cup14is formed of a material that is elastically deformable and lightproof, such as rubber-like silicon resin. First eye cup14may be formed of a sponge-like resin material. Being lightproof and configured in such a manner as to fill the space between user99and first lens barrel10, first eye cup14inhibits the viewability of an image from being decreased by the mixing of outside light into light that HMD100emits to cause user99to visually recognize the image.

As illustrated in the figure, first eye cup14according to the present embodiment is constituted by first member14iand second member14ii. First member14iis made of, for example, silicon resin. First member14iincludes insertion part14ain a shape of a barrel that is inserted into first lens barrel10, particularly first main portion11and includes cup part14bthat extends outward of the barrel (toward the positive side in the Y-axis direction) from an end portion of first main portion11on its opening side and has a curved plate shape of a size that makes cup part14breach the head of user99at the time of wearing HMD100. Cup part14bmakes a curve along a curve from the periphery of eye95to the temple of user99. User99can visually recognize an image through first eye cup14via opening14cthat is circular and corresponds to the display provided inside first lens barrel10.

Cup part14bincludes, on its contact end side on which cup part14bcomes into contact with user99, surface14dhaving a surface shape that faces the face of user99in such a manner as to increase the contact area of cup part14b. Here, with cup part14b, a space between surface14dconforming to the head of user99and a connection end at which cup part14bis connected to insertion part14ais continuously covered. This gives cup part14ba function of connecting first lens barrel10and the head of user99separated from each other to block the penetration of outside light into sight.

Between insertion part14aand cup part14b, a constricted portion having an outer circumference that is smaller than the outer circumference of insertion part14aand the outer circumference of cup part14bis formed. In other words, the constricted portion is a thin-walled portion at which the overall outer surface of first member14iconstricts. The formation of constricted portion gives first member14iflexibility that allows first member14ito be bent in an up-down direction and a right-left direction. Here, the flexibility of first member14iin the up-down direction is useful because such flexibility has the effect of increasing wearability for user99without influencing the lateral parallax of HMD100, but the flexibility of first member14iin the right-left direction may influence the lateral parallax of HMD100.

For that reason, first member14iis formed with thick-wall portions that expand the outer circumference of first member14ioutward, at locations where the constricted portion intersects a line passing the center of the constricted portion in its height direction and extends in the arrangement direction (i.e., locations where the constricted portion intersects the arrangement plane). The thick-wall portions are formed integrally with first member14iin such a manner as to bury the constricted portion on the arrangement plane. The thick-wall portions each have a taper shape of which the diameter increases as the taper shape extends toward the negative side of first lens barrel10in the Y-axis direction. Cup part14bthus presses the thick-wall portions toward the negative side in the Y-axis direction on their one end sides on which their tapers are decreased in diameter, and the pressure of the pressing is supported on their other end sides on which the tapers are increased in diameter. That is, the supports are made small and more specified and function in such a manner as to promote a bend of cup part14bin a direction separating from the supports. As a result, cup part14bis configured to be bent easily in the up-down direction.

The thick-wall portions support cup part14bfrom the insertion part14aside in such a manner as to oppose a bend of first member14iin the right-left direction. Further, in order to reinforce such supporting for cup part14b, cup part14bincludes a flat portion that extends outward of the thick-wall portions along an XZ plane intersecting the central axis of first lens barrel10and is connected to cup part14b. This forms a seesaw-like structure in which a bend of first member14iis supported by the flat portion, thereby strongly inhibiting a bend in the right-left direction and facilitating a bend in the up-down direction while the shape of cup part14bis maintained.

Here, surface14dof first member14iis formed with grooves14ethat extend in the Z-axis direction. In first eye cup14according to the present embodiment, a plurality of grooves14eare formed on upper and lower sides of first eye cup14that sandwich opening14cin the Z-axis direction as viewed in the Y-axis direction. On surface14d, second member14iiof first eye cup14is stuck. Second member14iiis formed of, for example, urethane and comes into direct contact with the periphery of eye95of user99.

Second member14iimade of a material that less stimulates skin, such as urethane, improves the sense of wearing HMD100. Here, by placing second member14ii, grooves14eare partially closed on its positive side in the Y-axis direction. Grooves14eand second member14iiform ventilation paths14fthrough which the inside and outside of first eye cup14communicate with each other in the Z-axis direction. There are ventilation paths14fprovided corresponding in number to grooves14e. For example, in the present embodiment, six ventilation paths14fare provided on each of a side upper than opening14c(the positive side in the Z-axis direction) and a side lower than opening14c(the negative side in the Z-axis direction) as viewed in the Y-axis direction.

Some of the plurality of ventilation paths14fare used for taking in air from the outside to the inside of the barrel of first eye cup14. The others of the plurality of ventilation paths14fare used for discharging air from the inside to the outside of the barrel of first eye cup14. Ventilation paths14feach taking in or discharging air in that manner can inhibit fogging caused by moisture that vaporizes from eye95of user99and the like from forming on an inner side of the barrel shape of first eye cup14.

In the present embodiment, as viewed in the Y-axis direction, of ventilation paths14f, ventilation paths14fprovided on the side upper than opening14c(on the positive side in the Z-axis direction) take part in discharging air, and ventilation paths14fprovided on the side lower than opening14c(on the negative side in the Z-axis direction) take part in taking in air. For example, inside the barrel shape of first eye cup14, heat generated by user99, the display of HMD100, and the like builds up, thus warming air inside the barrel shape. In the case where HMD100is used in such an attitude that the positive side in the Z-axis direction faces upward in a vertical direction, the warmed air is naturally discharged to the outside through ventilation paths14fprovided on the positive side in the Z-axis direction. As a result, the inside of the barrel shape of first eye cup14that is placed negative pressure is supplied with air that is taken in through ventilation paths14fprovided on the negative side in the Z-axis direction. The repetition of the discharging and supplying air constantly ventilates the inside of the barrel shape of first eye cup14, which is highly effective in inhibiting the formation of fogging.

Note that the provision of ventilation paths14fin this manner is likely to let outside light enter the inside of first eye cup14. In HMD100according to the present embodiment, ventilation paths14fare disposed relatively close to eye95of user99in such a manner as to extend in a direction intersecting an optical axis of light representing an image from the display. As a result, the mixing of outside light into the light from the display is difficult, thus inhibiting a decrease in viewability of an image due to the formation of ventilation paths14f.

Second member14iiis not indispensable in HMD100. That is, even in the case of first eye cup14only with first member14i, grooves14ecan form ventilation paths with a contact surface in the vicinity of eye95of user99. Therefore, the same advantageous effect can be produced. However, the configuration in which second member14iiis interposed to reliably form ventilation paths14fis useful because there is a case where ventilation paths14fare closed by the deformation of skin on the contact surface (e.g., a case where the HMD is worn being strongly pressed, etc.). Further, in first eye cup14constituted by first member14iand second member14ii, only removing second member14iicauses the switching of ventilation paths14ffrom the state of being through-holes to the state of being grooves14e. Switching to the state of being grooves14efacilitates the maintenance of ventilation paths14fsuch as cleaning the insides of ventilation paths14fthat are so fine that dirt and dust can easily accumulate, thus having the advantage of easily keeping first eye cup14clean.

As seen from the above, airflow for air exchange between the inside and outside of the barrel shape of first eye cup14via ventilation paths14fprovided in first eye cup14is produced independently in a space that forms the barrel shape of first eye cup14.FIG.7Ais a diagram for describing another airflow generation system provided in the head mounted display according to the embodiment.FIG.7Ais a diagram illustrating first lens barrel10as viewed from the negative side in the Y-axis direction. The figure illustrates a section of first lens barrel10taken along a plane parallel to the XZ plane at a position at which airflow generating device81(referred to also as FAN81) inside first lens barrel10can be seen.

As illustrated in the figure, HMD100is provided with airflow generating device81that actively generates, other than the airflow passively generated in first eye cup14, airflow for cooling heat-generating components that are expected to generate a relatively large amount of heat, such as display panel39and a main substrate on which processor38a, drive circuit38, and the like are mounted. Airflow generating device81includes an electric motor and a rotary wing and rotates the rotary wing with the electric motor to move air in a predetermined direction, thus generating an airflow. HMD100is configured to cool the heat-generating components with the generated airflow directly, or indirectly with a heat sink or the like. For that purpose, HMD100is formed with airflow path82that restricts positions by which the airflow passes (positions along solid-white arrows in the figure).

At the same time, as illustrated in the figure, partition wall83makes a portion in which airflow path82is formed independent of a space on a side of partition wall83on which first eye cup14is attached. HMD100is designed such that the airflow generated by airflow generating device81flows in an in-plane direction of the XZ plane (particularly, in the X-axis direction) from an inlet to an outlet in the figure. For example, when air is suctioned by airflow generating device81from the inside of the barrel shape of first eye cup14, moisture is mixed into the airflow, which may have an adverse effect on the heat-generating components or the like (however, an exception thereof will be described later). In contrast, when air is discharged by airflow generating device81into the inside of the barrel shape of first eye cup14, heated air is also supplied to the surface of eye95of user99, which is unfavorable from the viewpoint of the usability of HMD100.

In addition, a flow rate of the airflow for cooling the heat-generating components by airflow generating device81may dry the surface of eye95of user99excessively, which is inappropriate. It is appropriate to passively generate airflow such as that caused by ventilation paths14ffor removing moisture from the inside of the barrel shape of first eye cup14. In particular, first eye cup14in the present embodiment is configured such that the vicinity of eye95is covered minimally with first eye cup14, and thus has a small volume of the space inside its barrel shape. Therefore, only warming air easily generates a convection that is effective in removing the moisture. Since the space through which the airflow generated by airflow generating device81flows is independent of the space inside the barrel shape of first eye cup14, both the cooling of the heat-generating components and the removal of the moisture from the inside of the barrel shape of first eye cup14thus can be performed effectively.

The above description is given of an example in which the airflow generated by airflow generating device81is independent of the airflow generated in the air exchange between the inside and outside of the barrel shape of first eye cup14. For example, in such conditions that a location through which the airflow generated by airflow generating device81flows and a location where the heat-generating components are mounted are thermally coupled and physically separated by providing the heat-generating components with resin molds to inhibit contact with gases and by making full use of heat pipes or the like, even when the airflow with the moisture mixed in flows, the possibility that the airflow has an adverse influence on the heat-generating components and the like is kept low. Therefore, in such a configuration, the space inside the barrel shape of first eye cup14and an air-suction side space at the time of airflow generating device81generating the airflow may be coupled together.

FIG.7Bis a diagram for describing the other airflow generation system provided in the head mounted display according to another example of the embodiment. Here is illustrated a sectional view of first lens barrel10of an HMD according to the other example taken along a straight line that passes through airflow path82through which airflow generated by airflow generating device81described above flows, from an inlet to an outlet. It should be noted thatFIG.7Bschematically illustrates the configuration of the other example other than the space through which the airflow generated by airflow generating device81provided in first lens barrel10flows (including the space inside a barrel shape of first eye cup14).

As illustrated inFIG.7B, the space inside the barrel shape of first eye cup14is integrated with, via forced discharging path85, airflow path82through which the airflow generated by airflow generating device81flows, that is, a space provided on the airflow generating device81side of partition wall83. As a result, when airflow generating device81generates the airflow, air in the space inside the barrel shape of first eye cup14is made to flow concurrently along with the airflow, via forced discharging path85provided in the previous stage of airflow generating device81. The inside of the barrel shape of first eye cup14is then placed negative pressure, and dry outside air is supplied through ventilation paths14fand the like, thus inhibiting fogging from occurring in parts inside of the barrel shape of cup14. In this case, an on-off valve for airflow through an opening that is provided on the negative side of partition wall83in the Y-axis direction and connected to the outside of first lens barrel may be provided. Such an on-off valve operates as follows.

(1) In the case where the heat-generating components generate heat, and fogging occurs inside the barrel shape of first eye cup14, the on-off valve is opened, and airflow generating device81is controlled to generate a maximum amount of airflow.

(2) In the case where the heat-generating components generate heat, and no fogging occurs inside the barrel shape of first eye cup14, the on-off valve is opened, and airflow generating device81is controlled to generate a maximum amount of airflow.

(3) In the case where the heat-generating components generate no heat, and no fogging occurs inside the barrel shape of first eye cup14, the on-off valve is closed, and airflow generating device81is controlled to stop generating the airflow. It should be noted that the on-off valve may be opened in this situation.

(4) In the case where the heat-generating components generate no heat, and fogging occurs inside the barrel shape of first eye cup14, the on-off valve is closed, and airflow generating device81is controlled to generate a minute amount of airflow.

Here, a method of detecting the generation of heat from the heat-generating components, which triggers the operation of the on-off valve, and fogging inside the barrel shape of first eye cup14will be described.

The heat-generating states of the heat-generating components that are expected to generate relatively large amount of heat, such as display panel39and the main substrate on which processor38a, drive circuit38, and the like are mounted, can be detected by measuring temperature values of the vicinities of the heat-generating components with temperature sensors (not illustrated) or the like. By setting one or more thresholds for the temperature values, the heat-generating states of the heat-generating components can be detected based on whether temperature values exceed the respective threshold values and can be reflected in the control of the on-off valve described above.

For fogging inside the barrel shape of first eye cup14, when user99wearing HMD100recognizes fogging inside the barrel shape of first eye cup14, user99inputs the occurrence of fogging to HMD100with the controller or a switch not illustrated provided on HMD100. Based on the input, HMD100can detect the occurrence of fogging inside the barrel shape of first eye cup14. It should be noted that fogging may be detected using a dedicated sensor provided. For example, the occurrence of fogging may be detected through actual measurement by detecting that the adhesion of a dew drop causing the fogging establishes electrical conduction between two electrodes that are spaced away from each other by a minute distance equal to the size of the dew drop.

Based on the heat-generating states of the heat-generating components and the occurrence of fogging inside the barrel shape of first eye cup14detected in such a manner, the open/close control of the on-off valve can be performed as (1) to (4) described above. The configuration described above is similarly applied to second lens barrel20and second eye cup24.

Next, sound emitters that are built in first temple part15and second temple part25of HMD100will be described with reference toFIG.8AtoFIG.8CandFIG.9.FIG.8Ais a perspective view for describing how the first temple part of the head mounted display according to the embodiment is assembled. Part (a) ofFIG.8Aillustrates first rear temple part16before being assembled (disassembled). Part (b) ofFIG.8Aillustrates first rear temple part16after being assembled.

FIG.8Bis a sectional view illustrating a peripheral structure of the first rear temple part of the head mounted display according to the embodiment.FIG.8Billustrates a cross section of first rear temple part16taken along line b-b in part (b) ofFIG.8A.FIG.8Cis a perspective view illustrating a first component of the second temple part of the head mounted display according to the embodiment.FIG.9is a diagram for describing a function of a sound emitter when the head mounted display according to the embodiment is used.

FIG.8A,FIG.8B, andFIG.9illustrate first temple part15. Second temple part25has the same configuration as first temple part15except that they are in a bilateral symmetry, and thus the description of second temple part25will be omitted. In contrast, the structure described with reference toFIG.8Cis a structure specific to second temple part25and is not provided in first temple part15.

As illustrated in part (a) ofFIG.8A, first rear temple part16of HMD100is constituted by two components: first component16iand second component16iithat are divided by a plane parallel to a YZ plane. First component16iis a component that forms a portion of first rear temple part16on the positive side in the X-axis direction. Second component16iiis a component that forms a portion of first rear temple part16on the negative side in the X-axis direction. First rear temple part16is fixed by engaging first component16iand second component16iitogether in the X-axis direction, for example, by fitting a connection rod into connection holes. In this manner, first rear temple part16is formed as illustrate in part (b) ofFIG.8A.

Here, as illustrated in part (a) ofFIG.8A, sound emitter61is built in the first rear temple part. Sound emitter61is a module for emitting sound that is played back in accordance with the content described above. Specifically, sound emitter61receives an analog signal of which the output is adjusted via a digital/analog conversion circuit, an amplifier circuit, and the like not illustrated, based on sound played back in accordance with the content. Sound emitter61includes a vibration plate and a driving element for driving the vibrate plate. When the analog signal is input to the driving element, the driving element vibrates the vibration plate with vibration based on the analog signal. As a result, sound emitter61produces vibration based on the sound played back in accordance with the content, thereby outputting sound waves from the vibration. When the sound waves from the vibration propagate through air to reach ear96, user99perceive the sound waves.

In the case where sound waves are produced by vibrating the vibration plate, one of surfaces of the vibration plate produces a vibration in phase, and the other surface produces a vibration in anti-phase. Although both vibrations produces audible sounds, if a sound wave by a vibration in phase (hereinafter, referred to also as an in-phase wave) and a sound wave by a vibration in anti-phase (hereinafter, referred to also as an anti-phase wave) are emitted simultaneously, the sound waves cancel each other, failing to produce an audible sound. It is therefore necessary to separate the in-phase wave and the anti-phase wave from each other and cause only one of the sound waves to be perceived by user99. In HMD100according to the present embodiment, a hole for taking out one of the in-phase wave or the anti-phase wave and a hole for taking out the other are disposed away from each other for taking out sound waves by vibrations to the outside from sound emitter61built in first rear temple part16.

Specifically, as illustrated in part (b) ofFIG.8A, first rear temple part16is provided with in-phase hole63and anti-phase hole62that is disposed away from in-phase hole63. Note that in-phase hole63extends to both first component16iand second component16iiand is constituted by half hole63ithat is formed in first component16iand half hole63iithat is formed in second component16ii.

For an aesthetic point of view of HMD100, in-phase hole63and anti-phase hole62are provided, for example, on a lower surface side of first rear temple part16(the negative side in the Z-axis direction). Referring to part (a) ofFIG.8A, of the vibration plate (a circular plate at the center of sound emitter61) forming sound emitter61, a surface on the front side of the paper faces a space continuous to in-phase hole63and is a surface that outputs an in-phase wave. In contrast, of the vibration plate forming sound emitter61, a surface on the back side of the paper faces a space continuous to anti-phase hole62. Further, sound emitter61is provided, in the vicinity of the vibration plate, with a partition wall for inhibiting an in-phase wave and an anti-phase wave from interfering with each other. The partition wall is constituted by a plate member that is parallel to the vibration plate and for isolating both main surfaces of the vibration plate from each other and a wall member that extends from the plate member in a direction perpendicular to a surface of the plate to separate a space from the vibration plate to in-phase hole63and a space from the vibration plate to anti-phase hole62from each other.

The space continuous to in-phase hole63is a relatively small space, and thus an in-phase wave from the vibration plate is taken out through in-phase hole63immediately after generated. In contrast, the space continuous to anti-phase hole62is relatively large, and thus an anti-phase wave from the vibration plate heads to anti-phase hole62for a while through the space after generated and is then taken out through anti-phase hole62.

As illustrated inFIG.9, in-phase hole63is provided at a position close to ear96of user99in an attitude when user99wears HMD100. In contrast, anti-phase hole62is provided at a position far from ear96of user99in the attitude when user99wears HMD100. Further, the hole-axis direction of in-phase hole63is set to be rearward and downward. In contrast, the hole-axis direction of anti-phase hole62is set to be downward.

As seen from the above, by providing in-phase hole63in the vicinity of ear96of user99and providing anti-phase hole62at a position far from in-phase hole63and ear96of user99in first rear temple part16, the interference between an in-phase wave and an anti-phase wave is inhibited. In addition, in part (a) ofFIG.8A, by providing in-phase hole63in a direction heading to ear96of user99and providing anti-phase hole62in a direction different from the direction of in-phase hole63, the interference between an in-phase wave and an anti-phase wave is further inhibited.

Here, as illustrated inFIG.8B, a space formed between second component16iiand sound emitter61is configured to increase in its cross-sectional area as the space approaches in-phase hole63of first rear temple part16. Specifically, an inner wall of second component16iifacing sound emitter61forms thick-wall portion69. With the configuration of thick-wall portion69, the cross-sectional area of the space is regulated. In more detail, on the upper side of the paper inFIG.8B(i.e., at positions far from in-phase hole63), the inner wall of second component16iiprojects in such a manner as to extend toward sound emitter61to form a thickest portion of thick-wall portion69. The thickness of thick-wall portion69gradually decreases from the thickest portion toward in-phase hole63, thus forming inclined surface69athat is inclined with respect to the surface of the vibration plate of sound emitter61. As a result, when sound output from sound emitter61is reflected by inclined surface69aand passes though in-phase hole63, the high-frequency properties of the sound are flattened. Therefore, sound of higher quality can be provided to user99.

As described above, internal wiring67is disposed in second temple part26. Here, if such internal wiring67is present as being bare in an internal space of second rear temple part26continuous to anti-phase hole62, acoustic resistance is inappropriately increased.

As illustrated inFIG.8C, in the present embodiment, partition wall68for inhibiting internal wiring67from being bare is provided in the internal space of second rear temple part26continuous to anti-phase hole62. The figure illustrates partition wall68provided on first component26i. Partition wall68is in contact with an inner wall surface of a second component of second rear temple part26not illustrated, thereby isolating the internal space of second rear temple part26continuous to anti-phase hole62and a space for disposing internal wiring67from each other.

In this manner, internal wiring67is disposed in the space isolated by partition wall68and internal wiring41cand wiring71are electrically connected. This makes an anti-phase wave output by sound emitter61resist being subjected to the acoustic resistance by internal wiring67. HMD100capable of outputting sound of high quality is thus provided.

As illustrated inFIG.9, when user99wears HMD100, ear96of user99is rearward and downward of in-phase hole63. Therefore, an in-phase wave taken out through in-phase hole63easily reaches ear96of user99in the hole-axis direction of in-phase hole63. In contrast, an anti-phase wave taken out through anti-phase hole62heads in a direction different from a direction to ear96of user99and is thus not likely to reach ear96of user99. In this manner, HMD100is capable of cause user99to perceive sound played back in accordance with the content by taking out an in-phase wave and an anti-phase wave separately.

Note that a portion of first rear temple part16where sound emitter61is disposed is expanded compared with the other portions so that a large vibration plate can be accommodated. The provision of the expanded portion produces the effect of specifying a portion at which user99should hang first temple part15. In addition, a configuration in which the in-phase wave and the anti-phase wave are interchanged is possible. That is, the surface of sound emitter61outputting an in-phase wave and the surface of sound emitter61outputting an anti-phase wave may be interchanged, an anti-phase hole may be provided in place of in-phase hole63, and an in-phase hole may be provided in place of anti-phase hole62.

FIG.10is a top view for describing retaining mechanisms of the head mounted display according to the embodiment. The top view ofFIG.10illustrates HMD100as viewed from the positive side in the Z-axis direction. Here, in HMD100illustrated inFIG.10, retaining member65is illustrated.

In HMD100according to the present embodiment, the weight of first lens barrel10and second lens barrel20forms a majority of the weight of entire HMD100. In this case, with the configuration that makes HMD100be hung only on ear96of users99, HMD100may be pulled by the weight of a front part of HMD100to drop off in some conditions of use. Therefore, the example illustrated inFIG.10illustrates a configuration that inhibits HMD100from dropping off even in such a case.

Specifically, HMD100is provided with retaining mechanism16aand retaining mechanism26athat are capable of connecting retaining member65that pulls first rear temple part16and second rear temple part26in such a manner as to shorten the distance between first rear temple part16and second rear temple part26.

Retaining mechanism16ais an umbrella-like protrusion that is formed at one of end portions of first rear temple part16that is on a side opposite to the first lens barrel10side. Retaining member65is a rubber-like member having an elongated shape and provided with a plurality of holes at its one end portion and the other end portion. One of the holes at the one end portion of retaining member65is connected to retaining mechanism16a. The hole of retaining member65is connected to retaining mechanism16aby passing the umbrella portion of the protrusion to be engaged with the grip portion of the protrusion. The hole of retaining member65is thereby hooked on the umbrella portion to resist being unhooked from the grip portion.

Retaining mechanism26ais an umbrella-like protrusion that is formed at one of end portions of second rear temple part26that is on a side opposite to the second lens barrel20side. One of the holes at the other end portion of retaining member65is connected to retaining mechanism26a. The hole of retaining member65is connected to retaining mechanism26aby passing the umbrella portion of the protrusion to be engaged with the grip portion of the protrusion. The hole of retaining member65is thereby hooked on the umbrella portion to resist being unhooked from the grip portion.

Retaining member65acts to pull retaining mechanism16aand retaining mechanism26atoward each other via the holes formed at the one end portion and the other end portion. At this time, when strong force is applied, rubber properties of retaining member65allow retaining mechanism16aand retaining mechanism26ato be drawn apart from each other. This causes retaining mechanism16aand retaining mechanism26ato be pulled toward each other moderately. As retaining mechanism16aand retaining mechanism26aare pulled toward each other, first rear temple part16and second rear temple part26are pulled toward each other. As a result, first rear temple part16, retaining member65, and second rear temple part26cause HMD100to be retained on the back of the head of user99, thus inhibiting the dropping off of HMD100as described above.

As described above, the display apparatus (HMD100) according to the present embodiment includes: first lens barrel10that is in a shape of a bottomed barrel and includes, as a bottom portion, a first display device that displays a first image; second lens barrel20that is in a shape of a bottomed barrel and includes, as a bottom portion, a second display device that displays a second image; and support member41that is elongated in an arrangement direction in which first lens barrel10and second lens barrel20are arranged, and that, by passing through first lens barrel10and second lens barrel20in the arrangement direction, supports at least one of first lens barrel10or second lens barrel20to allow the at least one of first lens barrel10or second lens barrel20to move in the arrangement direction.

With such HMD100, first lens barrel10and second lens barrel can be supported by support member41passing through first lens barrel10and second lens barrel20. First lens barrel10and second lens barrel20can be retained at the same time only by retaining support member41. Here, since support member41passes through and supports first lens barrel10and second lens barrel20, support member41extends not only between first lens barrel10and second lens barrel20but also outward of first lens barrel10and second lens barrel20in the arrangement direction. Support member41therefore can be retained from the outside of first lens barrel10and second lens barrel20in the arrangement direction. In this manner, support member41can be easily supported, and first lens barrel10and second lens barrel20are retained at the same time by the support member that is easily supported. At this time, at least one of the first lens barrel or second lens barrel20can be moved on support member41in the arrangement direction. As a result, the distance between first lens barrel10and second lens barrel20can be changed. This makes it possible to adjust the position of second lens barrel20with respect to first lens barrel10or the position of first lens barrel10with respect to second lens barrel20for user99. HMD100having the above-described effects in combination and being configured more appropriately can be provided.

HMD100according to the present embodiment includes, for example: first lens barrel10that is in a shape of a bottomed barrel and includes, as a bottom portion, a first display device that displays a first image; second lens barrel20that is in a shape of a bottomed barrel and includes, as a bottom portion, a second display device that displays a second image; and support member41that is elongated in an arrangement direction in which first lens barrel10and second lens barrel20are arranged, and that, by passing through first lens barrel10and second lens barrel20in the arrangement direction, supports at least first lens barrel10to allow the at least first lens barrel10to move in the arrangement direction, wherein first lens barrel10includes a pressing mechanism that presses support member41in a direction intersecting the arrangement direction, toward an inner surface of first through-hole11aprovided in first lens barrel10through which support member41passes, and the pressing mechanism includes an adjuster that allows adjustment of pressing force for pressing support member41.

In supporting support member41, when first lens barrel10rotates about an axis in the arrangement direction with respect to support member41, and second lens barrel20rotates about an axis in the arrangement direction with respect to support member41, the barrel axis of first lens barrel10and the barrel axis of second lens barrel20can be made nonparallel. With the above-described configuration, the rotation of first lens barrel10with respect to support member41and the rotation of second lens barrel20with respect to support member41is strongly inhibited, thus strongly inhibiting the barrel axes from becoming nonparallel. As a result, images can be displayed more appropriately.

In addition, in the production of HMD100, the degree of precision in designing support member41, first through-hole11aof first lens barrel10, and second through-hole21aof second lens barrel20can be decreased. That is, when, compared to the size of the cross sectional shape of support member41perpendicular to the arrangement direction, the sizes of the corresponding cross sectional shapes of first through-hole11aand second through-hole21aare larger, the degree of fluctuations of the sizes is tolerable within a predetermined range within which fastening of screw member43is enabled. Therefore, even in the case where a manufacturing error occurs within the predetermined range, appropriate HMD100can be configured. That is, the number of members that are lost due to the manufacturing error can be reduced, and HMD100can be produced at lower cost. As seen from the above, according to the present embodiment, HMD100configured more appropriately can be provided.

For example, HMD100may further include adjusting member32that is connected to first lens barrel10and second lens barrel20, and adjusts a distance between first lens barrel10and second lens barrel20in the arrangement direction by changing at least either (i) relative positions of adjusting member32and first lens barrel10or (ii) relative positions of adjusting member32and second lens barrel20.

Accordingly, the distance between first lens barrel10and second lens barrel20can be adjusted only by handling adjusting member32for the adjustment. The position of second lens barrel20with respect to first lens barrel10or the position of first lens barrel10with respect to second lens barrel20can be adjust more easily for user99. Further, since adjusting member32connects first lens barrel10and second lens barrel20separately from support member41, the non-parallelism between the barrel axis of first lens barrel10and the barrel axis of second lens barrel20is inhibited. As a result, images can be displayed more appropriately. Therefore, HMD100configured more appropriately can be provided.

For example, HMD100may further include temple parts (first temple part15and second temple part25) respectively connected to two end portions of support member41in the arrangement direction. First lens barrel10may include first sound pickup device53and second sound pickup device54each of which detects an ultrasound, the second lens barrel may include a third sound pickup device and a fourth sound pickup device each of which detects an ultrasound, and the temple parts may respectively include fifth sound pickup device55and a sixth sound pickup device each of which detects an ultrasound.

Accordingly, it is possible to achieve the disposition of sound pickup devices that enables an ultrasound transmitter to be located efficiently within the restrictions on an installation space of HMD100. Therefore, HMD100configured more appropriately can be provided.

For example, HMD100may further include temple parts (first temple part15and second temple part25) respectively connected to two end portions of support member41in the arrangement direction, and the temple parts may respectively include first imaging device51and a second imaging device each of which is provided at an end portion of a corresponding one of the temple parts connected to support member41and captures an image.

Accordingly, it is possible to achieve the disposition of imaging devices that enables the attitude of HMD100to be detected efficiently within the restrictions on an installation space of HMD100. Therefore, HMD100configured more appropriately can be provided.

In addition, for example, fixing member411that fixes the relative position of adjusting member32with respect to support member41in the arrangement direction may be further provided.

Accordingly, the relative position between support member41and adjusting member32in the arrangement direction can be fixed. In the case where first lens barrel10and second lens barrel20are retained on user99via support member41, if first lens barrel10and second lens barrel20moves with respect to support member41, it is possible that the positions of the lens barrels do not fit to the position of eyes95of user99even when the distance between first lens barrel10and second lens barrel20is appropriate. With the above-described configuration, when the distance between first lens barrel and second lens barrel20is adjusted, first lens barrel10and second lens barrel20are inhibited from moving on support member41together with adjusting member32. That is, even when first lens barrel10and second lens barrel20are retained on user99via support member41, their lens barrels can be retained at their appropriate positions. Therefore, HMD100configured more appropriately can be provided.

For example, HMD100according to the present embodiment includes: first lens barrel10that is in a shape of a bottomed barrel and includes, as a bottom portion, a first display device that displays a first image; second lens barrel20that is in a shape of a bottomed barrel and includes, as a bottom portion, a second display device that displays a second image; support member41that supports first lens barrel10and second lens barrel20; and an eye cup (first eye cup14and second eye cup24) that is in a barrel shape and is provided at an open end of each of first lens barrel10and second lens barrel20, wherein the eye cup includes two or more ventilation paths14fthrough which inside and outside of the eye cup communicate with each other in an intersecting direction that intersects (i) a barrel axis direction of first lens barrel10and second lens barrel20and (ii) an arrangement direction in which first lens barrel10and second lens barrel20are arranged.

In such HMD100, air can be discharged from the space formed between the head of user99and each lens barrel to the outside via some of two or more ventilation paths14f, and air can be supplied from the outside via the others of ventilation paths14f. By circulating the air in this manner, an increase in humidity in the space can be inhibited, and thus, the occurrence of fogging in the optical system such as a lens between the display and the eye can be inhibited. Therefore, HMD100configured more appropriately, inhibiting the occurrence of fogging, can be provided.

For example, the eye cup (first eye cup14and second eye cup24) may include first member14iand second member14ii, first member14iincluding a portion attached to a corresponding lens barrel of first lens barrel10and second lens barrel20, second member14iibeing stuck to surface14dof first member14iopposite to a surface where the corresponding lens barrel is provided, and each of two or more ventilation paths14fmay be a hole through which the inside and the outside of the eye cup communicate with each other in the intersecting direction, and include: groove14eprovided on surface14dof first member14iand extending in the intersecting direction; and a lid portion that closes a part of groove14ewhen second member14iiis stuck to first member14i.

Accordingly, the contact properties of the eye cups can be improved, and ventilation paths14fcan be kept more clearly. Therefore, HMD100configured more appropriately with an improved effect of inhibiting the occurrence of fogging can be provided.

For example, HMD100according to the present embodiment includes, for example: first lens barrel10that is in a shape of a bottomed barrel and includes, as a bottom portion, a first display device that displays a first image; second lens barrel20that is in a shape of a bottomed barrel and includes, as a bottom portion, a second display device that displays a second image; support member41that supports first lens barrel10and second lens barrel20; and temple parts (first temple part15and second temple part25) which are provided corresponding to first lens barrel10and second lens barrel20and each of which includes sound emitter61that emits sound.

Such HMD100is capable of emitting, by only itself, sound played back in accordance with the content displayed. In HMD100, sound is emitted in the temple parts, which are disposed at positions close to ears96of user99, and thus the sound is sufficiently audible even in the case of low power. As a result, the power consumption for emitting sound can be reduced. Therefore, HMD100capable of outputting an image and sound and configured more appropriately can be provided.

For example, a sound emitter may be built in each of the temple parts (first temple part15and second temple part25), and each temple part may include in-phase hole63through which an in-phase wave generated by sound emitter61is taken out to the outside of the temple part and anti-phase hole62through which an anti-phase wave generated by sound emitter61is taken out to the outside of the temple part and which is disposed away from in-phase hole63.

Accordingly, the interference between an in-phase wave and an anti-phase wave can be inhibited. If an in-phase wave and an anti-phase wave interfere with each other, the interference reduces the amplitudes of the waves, and it is thus possible that user99cannot listen to emitted sound appropriately. With the above-described configuration, HMD100that is capable of inhibiting the interference between an in-phase wave and an anti-phase wave and capable of emitting sound that user99can listen to appropriately can be provided. Therefore, HMD100capable of emitting sound appropriately audible and configured more appropriately can be provided.

HMD100according to the present embodiment includes, for example: first lens barrel10that is in a shape of a bottomed barrel and includes, as a bottom portion, a first display device that displays a first image; second lens barrel20that is in a shape of a bottomed barrel and includes, as a bottom portion, a second display device that displays a second image; support member41that supports first lens barrel10and second lens barrel20; and temple parts (first temple part15and second temple part25) that are provided corresponding to first lens barrel10and second lens barrel20and include, at their end portions on a side opposite to the first lens barrel10side or the second lens barrel20side, retaining mechanisms16aand26acapable of being connected to retaining member65.

There is a case where HMD100is used in such a manner that only hanging the temple parts on ears96of user99cannot deal with the lens barrel parts that are relatively heavy. In HMD100as described above, by connecting first temple part15and second temple part25to each other with retaining member65, an annular shape can be formed together with support member41that passes through first lens barrel10and second lens barrel20. The head of user99is placed inside the annular shape, and thus the head of user99is unlikely to be separated from the annular shape. That is, HMD100is unlikely to drop off from the head of user99. Further, when retaining member65is formed of a rubber-like member, the annular shape expands or contracts in accordance with the shape of the head of user99, and thus HMD100having higher wearability can be provided. Therefore, HMD100configured more appropriately can be provided.

Other Embodiments

The embodiment and the like have been described above. However, the present disclosure is not limited to the above embodiment and the like.

In the above embodiment and the like, the constituent elements constituting the HMD are exemplified. However, the functions of the constituent elements included in the HMD may be allocated in any manner to a plurality of elements constituting the HMD

The configurations of the connector box, the eye cup, the built-in sound emitter, and the retaining mechanism described above are effective not only to the HMD described in Basic Configuration but also to an HMD of any type. For example,FIG.11illustrates a head mounted display according to another embodiment.

HMD100zillustrated inFIG.11, first temple part15zis directly connected to first lens barrel10z, and second temple part25zis directly connected to second lens barrel20z. In HMD100z, first lens barrel10zand second lens barrel20zare supported each other by support member41zof a non-penetrating type. Even in the case of HMD100zin the figure, an HMD configured more appropriately can be provided by applying at least one of the configurations of the connector box, the eye cup, the built-in sound emitter, and the retaining mechanism described above to HMD100z.

The present disclosure also encompasses other forms achieved by making various modifications conceivable to those skilled in the art to the embodiments etc. and forms implemented by freely combining constituent elements and functions of the embodiments etc. without departing from the essence of the present disclosure.

INDUSTRIAL APPLICABILITY

The present disclosure is useful as a wearable display apparatus such as a head mounted display.