JP6011563B2 - Image display device and head mounted display - Google Patents

Description

  The present invention relates to an image display device and a head mounted display.

  2. Description of the Related Art A head mounted display (hereinafter also referred to as “HMD”) that is worn on a user's head and presents an image superimposed on a light beam from the outside is known. Patent Document 1 discloses an HMD having a monocular display unit having a reflecting portion (hereinafter also referred to as a “deflection member”) disposed in front of an observer's eyes. Further, in Patent Document 1, the display unit is divided into a main body part that forms image light and an exit part having an exit that emits the formed image light to the eyes of the observer. The exit port portion is configured to be detachable from the main body portion by an external force. A half mirror as a reflecting portion is provided at the exit port portion. The reflection part emits image light formed on the main body part to the eyes of the observer, so that the user can visually recognize the image.

JP 2013-44830 A

  When the HMD is used in a state where the HMD is mounted on the head, a reflecting portion is necessary. On the other hand, there is a case where it is desired to use the reflection unit by removing it from the main body. In this case, there is a demand for automatically switching the setting of the HMD depending on the presence / absence of a reflection portion. However, since the HMD described in Patent Document 1 does not include a mechanism for detecting that the reflection unit is detached from the main body portion, the setting of the HMD cannot be automatically switched. When the HMD is provided with a mechanism for detecting that the reflection unit is detached from the main body, it is necessary to separately provide an electrical configuration for detection, and the HMD becomes large.

  An object of the present invention is to provide an image display device and a head mounted display capable of downsizing an electrical configuration capable of detecting attachment / detachment of a reflection portion from a main body portion.

An image display device according to an aspect of the present invention is provided in a housing, an image light output unit that is provided in the housing and outputs image light that forms an image in a first direction, and is provided in the housing. An electric board that electrically controls the image light output unit, a deflection member that can be attached to one end of the housing and deflects the image light in a second direction different from the first direction, and provided at the one end A detection unit that detects whether the deflection member is attached to the housing; and a connection unit that electrically connects the detection unit and the electric substrate , wherein the electric substrate is the image light output unit. It is characterized by being formed integrally with.

According to the image display device, the electric board that electrically controls the image light output unit and the electric board that electrically controls the detection unit that detects whether the deflection member is attached to the housing are shared. Therefore, the image display device can be downsized. Moreover, since the substrate is integrated with the image light output unit, the structure can be reduced in size.

  The deflection member includes a reflection surface that reflects the image light in a second direction, and the image light output unit outputs an image formed on a predetermined display surface as image light in the first direction, and The image light output unit may be provided in the housing and at a position facing the reflection surface, and the electric substrate may be provided along the display surface. In this case, since an electric board that is commonly used by the detection unit and the image light output unit is provided along the display surface on which an image to be reflected by the deflecting member is formed, the space in the housing is wasted. Can be avoided.

  The image light output unit may be provided in the casing so as to face the reflection surface. An electric board that is commonly used by the detection unit and the image light output unit is provided along the display surface, so that it is possible to avoid wasting space in the housing and to be provided at the other end of the housing. Thus, the electric board can be used for electrical connection from the outside of the housing.

  The housing includes an inner wall extending from the electric board to the one end along the first direction, and the connecting portion is a wiring provided along the inner wall, the detecting portion and the electric board May be electrically connected. Since the wiring that connects the detection unit and the electric board is provided along the inner wall in the housing extending from the electric board to the one end along the first direction, without interfering with the optical path for outputting the image light, The detection unit and the electric substrate can be electrically connected.

  The inner wall may be provided with a groove extending from the electric substrate to the one end along the first direction, and the wiring may be provided along the groove. In this case, since the wiring connecting the detection unit and the electric board is accommodated in the groove along the first direction, the wiring does not move and the detection unit and the electric board do not interfere with the optical path for outputting the image light. Can be electrically connected.

  The detection unit is an optical sensor that detects light deflected along the second direction from the deflection member. In this case, the presence or absence of the deflecting member is detected by the optical sensor.

  The image display device may be provided in a head mounted display. The above effects can also be achieved in a head mounted display.

It is a perspective view of HMD1. 2 is a plan view of the image display device 10. FIG. It is sectional drawing of the image display apparatus 10 in the AA line of FIG. 1 is a perspective view of an image display device 10. FIG. 3 is a longitudinal sectional view of a housing 2 and a half mirror holder 25. FIG. It is a block diagram which shows the electric constitution of HMD1. It is a top view of the image display apparatus 10 explaining the function of the connection detection sensor 20 of 1st embodiment. It is a top view of the image display apparatus 10 explaining the function of the connection detection sensor 20 of 2nd embodiment. It is a top view of the image display apparatus 10 explaining the function of the connection detection sensor 20 of 3rd embodiment.

  Hereinafter, a head mounted display 1 (hereinafter referred to as “HMD1”) which is an embodiment of the present invention will be described with reference to the drawings. In the following description, the upper direction, the lower direction, the lower right direction, the upper left direction, the upper right direction, and the lower left direction in FIG. 1 are the upper direction, the lower direction, the front direction, the rear direction, the right direction, and the left direction. In this embodiment, in order to help understanding the positional relationship and the directional relationship in various configurations, in the related drawings, the upper, lower, front, rear, right and left sides of the HMD 1 are axes of a three-dimensional Cartesian coordinate system. Will be described with reference to FIG.

  The configuration of the HMD 1 will be described with reference to FIG. The HMD 1 includes an image display device 10 and a control device 50. The image display device 10 is used by being mounted on, for example, glasses 5 that are dedicated mounting tools. In addition to the glasses 5, the image display device 10 may be attached. In the example shown in FIG. 1, the glasses 5 include a left lens 8A and a right lens 8B. The image display device 10 passes through the left lens 8A and irradiates the left eyeball (not shown) of the user with image light. The image display device 10 is detachably connected to the control device 50 via the harness 7. For example, the control device 50 is used while being attached to a user's waist belt or the like. The control device 50 controls the image display device 10.

  The configuration of the image display apparatus 10 will be described with reference to FIGS. The image display device 10 includes a housing 2. The housing 2 is a square cylindrical resin member. The housing 2 includes a projection unit 30 (see FIG. 3). The projection unit 30 includes a liquid crystal device 14. The liquid crystal device 14 generates image light, passes through the second joint end 274 that is an opening on the left end side of the housing 2, and emits the light in the left direction. The direction from the projection unit 30 toward the second joint end 274 corresponds to the “first direction” of the present invention. As shown in FIG. 3, an electric substrate 205 that electrically controls the projection unit 30 is provided on the right side of the projection unit 30 in the housing 2 so as to be parallel to the display surface of the liquid crystal device 14. . In addition, a resin half mirror holder 25 is detachably held at the second joining end 274. The half mirror holder 25 holds the resin half mirror 3. The half mirror 3 has a reflecting surface 3A that reflects at least a part (for example, half) of the light emitted from the projection unit 30 in the direction of the left lens 8A. The reflection surface 3 </ b> A is formed on the side of the half mirror 3 facing the left lens 8 </ b> A of the glasses 5 and the projection unit 30. The direction from the reflective surface 3A toward the left lens 8A corresponds to the “second direction” of the present invention.

  When the HMD 1 is worn by the user, the emitted light reflected by the reflecting surface 3A is directed toward the left lens 8A of the glasses 5 and passes through the left lens 8A to the left eyeball (not shown) of the user. Incident. The incident light is imaged on the retina by the crystalline lens of the eye, so that a virtual image (image) is visually recognized by the user. The half mirror 3 transmits at least part (for example, half) of external light from a real image of the external world. When the HMD 1 is worn by the user, the transmitted external light enters the left eyeball (not shown) of the user. Therefore, the user can visually recognize the image superimposed on the real image of the outside world within his field of view. Instead of the half mirror 3, a deflecting member such as a prism or a diffraction grating may be used. Instead of the half mirror 3, a total reflection mirror may be used.

  As shown in FIG. 1, a vertically long slit 9 is provided at the center in the left-right direction of the front surface of the housing 2. A part of the adjuster 16 is exposed in the slit 9. The user adjusts the focus distance of the image visually recognized by the user by rotating the adjuster 16 in the vertical direction with a finger. The “focus distance” means a distance to an image presented by the HMD 1.

  The configuration of the projection unit 30 will be described with reference to FIG. The projection unit 30 includes a lens holder 15, an eyepiece optical unit 120, a liquid crystal holder 17, a liquid crystal device (LCD) 14, an adjuster 16, and the like. The lens holder 15 is formed in a cylindrical shape, and the eyepiece optical unit 120 is held inside thereof. The eyepiece optical unit 120 includes three lenses 111, 112, and 113. The optical axes of the lenses 111 to 113 are located on an axis extending in the left-right direction at the cylindrical inner center of the lens holder 15. The eyepiece optical unit 120 collects the image light emitted from the liquid crystal device 14 and guides it to the second joint end 274 of the housing 2. “Condensing” means an optical action that reduces the degree of diffusion of diffused image light. That is, “collection” is not limited to a configuration in which image light is converted into convergent light or parallel light by the eyepiece optical unit 120. The liquid crystal holder 17 holds the liquid crystal device 14. The liquid crystal device 14 includes a liquid crystal element and a light source. The liquid crystal device 14 can display a content image. The content image is a still image or a moving image. The liquid crystal device 14 emits image light based on a video signal transmitted from the control device 50 via the harness 7.

  The adjuster 16 has a ring shape. The adjuster 16 is attached to and attached to the outer periphery of the liquid crystal holder 17. A spiral groove cam 17 </ b> A is provided on the outer peripheral surface of the liquid crystal holder 17. An engaging portion (not shown) is provided on the inner peripheral surface of the adjuster 16. The engaging portion engages with the groove cam 17A of the liquid crystal holder 17 and moves along the groove cam 17A. The adjuster 16 is positioned in the vertical and horizontal directions within the housing 2. Therefore, the adjuster 16 rotates at that position. When the adjuster 16 is rotated in one direction or the opposite direction, the engaging portion slides on the groove cam 17A, and the liquid crystal holder 17 moves in the left-right direction. Thereby, the distance between the liquid crystal device 14 and the eyepiece optical unit 120 is changed, and the focus distance of the image presented by the HMD 1 is adjusted.

  The eyeglasses 5 shown in FIG. 1 can hold the image display device 10 on the user's head by being worn on the user's head. The glasses 5 include a frame 6, a support portion 4, a left lens 8A, and a right lens 8B. The shape of the frame 6 is substantially the same as that of normal glasses. The support 4 is provided at the right end of the upper surface of the frame 6 that supports the left lens 8 </ b> A in the frame 6. The support unit 4 holds the housing 2 of the image display device 10. The support part 4 can move the holding position of the housing 2 in the vertical direction and the horizontal direction. The user can adjust the position so that the position of the left eyeball and the position of the half mirror 3 are aligned in the front-rear direction by moving the housing 2 in the vertical direction and the horizontal direction.

  Note that the image display device 10 may be attached to a wearing tool other than the glasses 5 such as glasses, a helmet, and headphones that the user uses on a daily basis. The liquid crystal device 14 may be another spatial modulation element. For example, the liquid crystal device 14 may be a retinal scanning display unit that displays an image by two-dimensionally scanning a laser beam having an intensity according to an image signal, and an organic EL (Organic Electro-luminescence) display. In FIG. 1, the support unit 4 and the image display device 10 are provided on the right side of the frame 6, but the support unit 4 and the image display device 10 may be provided on the left side of the frame 6. In this case, the image light is incident on the right eyeball of the user while the HMD 1 is worn by the user.

  As shown in FIG. 4, the image display device 10 includes a housing 2 and a half mirror holder 25. The housing | casing 2 and the half mirror holder 25 are connected so that isolation | separation is mutually possible. The housing 2 includes an upper plate 281, a lower plate 282, a side wall 283, and a side wall 284.

  As shown in FIG. 4, a portion of the half mirror holder 25 connected to the housing 2 is a first joint end 252 whose end surface is a substantially horizontally long rectangular shape. The first joining end 252 has a substantially rectangular shape with an end face that is horizontally long. Specifically, the first joint end portion 252 has an upper horizontal edge 256 and a lower horizontal edge 257 that extend in the front-rear direction and a front vertical edge 258 that extends in the up-down direction and has a substantially arc shape in the head-mounted state. And a rear vertical edge 259.

  Further, a portion of the housing 2 connected to the half mirror holder 25 is a second joint end portion 274 having a substantially horizontally long transverse section. The second joining end 274 has a substantially rectangular shape with an end surface that is horizontally long. Specifically, an upper horizontal edge 276 and a lower horizontal edge 277 that extend in the front-rear direction in the head-mounted state, and a front vertical edge 278 and a rear vertical edge 279 that extend in the vertical direction and are substantially arc-shaped. Yes. When the half mirror holder 25 is held by the housing 2, the upper horizontal edge 256, the lower horizontal edge 257, the front vertical edge 258, the rear vertical edge 259 of the half mirror holder 25, and the upper horizontal edge of the housing 2. The edge 276, the lower horizontal edge 277, the front vertical edge 278, and the rear vertical edge 279 contact each other.

  The image display device 10 further includes a connection mechanism that removably connects the housing 2 and the half mirror holder 25 to each other. In the coupled state of the half mirror holder 25 and the housing 2, the coupling mechanism is disposed so as to straddle the first joint end 252 and the second joint end 274.

  Next, with reference to FIG. 4, a connection mechanism between the housing 2 and the half mirror holder 25 will be described. The coupling mechanism between the housing 2 and the half mirror holder 25 is composed of convex portions 303 and 304 and concave portions 293 and 294 that can be engaged with or detached from each other. One of the convex portions 303 and 304 and the concave portions 293 and 294 is formed on the housing 2, and the other is formed on the half mirror holder 25.

  Specifically, in the present embodiment, of the first joint end 252 of the half mirror holder 25, the upper plate 254 and the lower plate 255 facing each other in the vertical direction are cantilevered and integrated. The hook 301 and the hook 302 are formed respectively. Convex portions 303 and 304 are formed at the tip portions of the hooks 301 and 302, respectively. Each of the hooks 301 and 302 has a thin plate shape with a horizontally long cross section, and extends substantially in the left-right direction from the half mirror holder 25 toward the housing 2 in the head-mounted state. The upper and lower convex portions 303 and 304 protrude in the same position and in opposite directions when viewed from the upper side to the lower side.

  The hooks 301 and 302 are made of synthetic resin as an example, and are integrally formed with the half mirror holder 25. The hooks 301 and 302 can be elastically deformed in a direction perpendicular to the plane of the hooks 301 and 302 (up and down direction in FIG. 4). Therefore, the convex portions 303 and 304 can be elastically displaced in the substantially vertical direction relative to the half mirror holder 25. That is, each hook 301, 302 functions as a cantilever elastic beam.

  Correspondingly, the receiving portions 291 and 292 are cantilevered integrally with the upper plate 281 and the lower plate 282 that are opposite to each other in the up-down direction of the second joint end portion 274 of the housing 2. Is formed. Recesses 291 and 292 are formed with recesses 293 and 294, respectively. The upper recess 293 and the lower recess 294 open in opposite directions when viewed from the upper side to the lower side. Similarly to the hooks 301 and 302, the receiving portions 291 and 292 extend from the housing 2 toward the half mirror holder 25 substantially in the left-right direction in the head mounted state.

  Similarly to the hooks 301 and 302, the receiving portions 291 and 292 extend from the housing 2 in a cantilever manner. However, unlike the hooks 301 and 302, the receiving portions 291 and 292 are substantially hardly elastically deformed due to the material mechanical structure. That is, the receiving portions 291 and 292 act as stationary members, while the hooks 301 and 302 act as movable members. Therefore, as shown in FIG. 5, the half mirror holder 25 is mounted on the housing 2 by fitting the convex portions 303 and 304 into the concave portions 293 and 294. As shown in FIG. 4, a connection detection sensor 20 that detects the presence or absence of the half mirror holder 25 is provided at the second joint end 274 of the housing 2 on the inner wall 283 </ b> A side of the side wall 283.

  The configuration of the control device 50 will be described with reference to FIG. The control apparatus 50 is attached to a user's waist belt, an arm, etc., for example. The control device 50 controls the image display device 10. The control device 50 is detachably connected to the image display device 10 via the harness 7. The control device 50 includes a casing 60, an operation switch 61, a power switch 62, and the like on the operation surface. The shape of the housing 60 is a substantially rectangular parallelepiped with rounded edges. The operation switch 61 is a switch for performing various settings in the image display apparatus 10 and various operations during use. The power switch 62 is a switch for turning on or off the power of the HMD 1. A power lamp 63 is built in the power switch 62.

  The electrical configuration of the HMD 1 will be described with reference to FIG. First, the electrical configuration of the image display apparatus 10 will be described. The image display device 10 includes a CPU 11. The CPU 11 is electrically connected to a RAM 12, a program ROM 13, a liquid crystal device 14, an interface 18, and a connection controller 19. The RAM 12 temporarily stores various data. The program ROM 13 stores a program executed by the CPU 11 and an OS. The program is executed on the OS. The program and the OS are stored in the program ROM 13 when the HMD 1 is shipped. The connection controller 19 is connected to the connection controller 58 of the control device 50 via the harness 7 and performs wired communication. The connection detection sensor 20 is electrically connected to the CPU 11 via the interface 18. The CPU 11, the RAM 12, the program ROM 13, the interface 18, the connection controller 19, and the like are provided on the electric board 205 shown in FIG.

  Note that the image display apparatus 10 may further include a flash ROM. The flash ROM may store a program executed by the CPU 11. The CPU 11 may execute a program stored in the flash ROM. The program executed by the CPU 51 of the control device 50 may be stored in the program ROM 13 and the flash ROM. The CPU 11 may execute the same process as the process executed by the CPU 51 of the control device 50 instead of the CPU 51.

  Next, the electrical configuration of the control device 50 will be described. The control device 50 includes a CPU 51. A RAM 52, a program ROM 53, a flash ROM 54, an interface 55, a video RAM 56, an image processing unit 57, a connection controller 58, and a wireless communication unit 59 are electrically connected to the CPU 51. The RAM 52 temporarily stores various data. The program ROM 53 stores a program executed by the CPU 51 and an OS. The program is executed on the OS. The program and OS are stored in the program ROM 53 when the HMD 1 is shipped. The flash ROM stores various information.

  The interface 55 is connected to the operation switch 61, the power switch 62, and the power lamp 63, and controls signal input / output. The image processing unit 57 forms an image to be displayed on the liquid crystal device 14 of the image display device 10 and temporarily stores it in the video RAM 56. The connection controller 58 is connected to the connection controller 19 of the image display device 10 via the harness 7 and performs wired communication. The wireless communication unit 59 communicates with peripheral devices connected to the Internet, LAN, and the like via an access point (not shown) connected to the Internet, LAN, and the like. Examples of peripheral devices include personal computers, smartphones, tablet portable terminals, servers, and the like.

  Note that a program executed by the CPU 51 may be stored in the flash ROM 54 of the control device 50. The CPU 51 may execute a program stored in the flash ROM 54. The program ROM 53 and the flash ROM 54 may store a program executed by the CPU 11 of the image display device 10. The CPU 51 may execute the same process as the process executed by the CPU 11 of the image display device 10 instead of the CPU 11.

  Further, the HMD 1 may download and install the program from the program download server via the wireless communication unit 59. For example, the program stored in the storage device of the server may be transmitted from the server to the HMD 1 as a computer-readable temporary storage medium (for example, a transmission signal). The program may be stored in a computer-readable storage device provided in the HMD 1, for example, a flash ROM. The CPU 11 may execute a program based on a program stored in the flash ROM. The CPU 51 may execute a program based on the program stored in the flash ROM 54. The storage device may be a non-temporary storage medium excluding a temporary storage medium, such as a ROM, a flash ROM, an HDD, or a RAM. The non-transitory storage medium may be capable of retaining data regardless of the length of time for storing the data.

  Furthermore, the configuration of the HMD 1 is not limited to the above-described embodiment, and may be a configuration in which the image display device 10 and the control device 50 are integrated, for example. The CPU 11 of the image display device 10 and the CPU 51 of the control device 50 may communicate wirelessly instead of the harness 7.

  Next, the connection detection sensor 20 that detects whether or not the half mirror holder 25 is attached to the housing 2 will be described with reference to FIG. FIG. 7 shows a first embodiment of the connection detection sensor 20. As an example, the connection detection sensor 20 of the first embodiment uses a light amount detection sensor such as a photodiode. In the first embodiment shown in FIG. 7, the connection detection sensor 20 is soldered to the sensor substrate 201. Only the connection detection sensor 20 is fixed to the sensor board 201, and the control of the connection detection sensor 20 is performed by the electric board 205. The sensor substrate 201 is fixed to the inner wall 283 </ b> A side of the side wall 283 at the second joint end 274. Therefore, the light receiving surface of the connection detection sensor 20 faces the second joint end 274. Further, wiring 202 is provided along the inner wall 283A of the side wall 283 from the sensor substrate 201 to the electric substrate 205. On the inner wall 283A, a pair of walls 204 from the second joint end 274 side toward the electric substrate 205 are formed so as to be orthogonal to the inner wall 283A. A groove 203 is formed between the pair of walls 204. The wiring 202 is provided in the groove 203.

  Next, the operation of the connection detection sensor 20 of the first embodiment will be described. As shown in FIG. 7A, when the half mirror holder 25 is fitted in the housing 2, the light emitted from the liquid crystal device 14 shown in FIG. 3 is reflected by the reflecting surface 3 A of the half mirror 3. The light enters the connection detection sensor 20. The external light B also passes through the half mirror 3 and enters the connection detection sensor 20. Assuming that the reflectance of the reflecting surface 3A is 50%, when the half mirror holder 25 is fitted in the housing 2, “the amount of light detected by the connection detection sensor 20 = the half mirror from the liquid crystal device 14” 3 ”of the amount of reflected light reflected by the reflecting surface 3 </ b> A + ½ of the amount of external light B”. On the other hand, as shown in FIG. 7B, when the half mirror holder 25 is not fitted in the housing 2, the light emitted from the liquid crystal device 14 shown in FIG. 3 enters the connection detection sensor 20. Only the external light B enters the connection detection sensor 20 without being illuminated. Therefore, when the half mirror holder 25 is fitted in the housing 2, the amount of light incident on the connection detection sensor 20 varies depending on whether the liquid crystal device 14 is turned on or off.

  The CPU 51 of the control device 50 detects whether or not the half mirror holder 25 is fitted in the housing 2 as follows. First, the CPU 51 of the control device 50 instructs the CPU 11 of the image display device 10 to measure the light amount by the connection detection sensor 20 with the image light of the liquid crystal device 14 turned off. The CPU 11 of the image display device 10 measures the amount of light by the connection detection sensor 20 with the image light of the liquid crystal device 14 turned off. Next, the CPU 11 transmits the measured value to the CPU 51 of the control device 50. The CPU 51 stores the received value in the RAM 52. Next, the CPU 51 of the control device 50 instructs the CPU 11 of the image display device 10 to measure the light amount by the connection detection sensor 20 with the image light of the liquid crystal device 14 turned on. The CPU 11 of the image display device 10 measures the light amount by the connection detection sensor 20 in a state where the image light of the liquid crystal device 14 is turned on. The CPU 11 transmits the measured result value to the CPU 51 of the control device 50. The CPU 51 stores the received value in the RAM 52. Next, the CPU 51 compares the two values stored in the RAM 52 to determine the difference in light amount. If the difference in the amount of light is equal to or greater than a predetermined value determined in advance by experiment, the CPU 51 determines that the half mirror holder 25 is attached to the housing 2. If the difference in the amount of light is less than a predetermined value determined in advance through experiments, the CPU 51 determines that the half mirror holder 25 is not attached to the housing 2.

  Next, a second embodiment of the connection detection sensor 20 will be described with reference to FIG. As the connection detection sensor 20 of the second embodiment, a distance sensor is used. As an example, an infrared distance sensor that emits infrared rays and measures a distance, an ultrasonic distance sensor that emits ultrasonic waves and measures a distance, and the like. Is used. In the second embodiment shown in FIG. 8, as an example, the connection detection sensor 20 constituted by an infrared distance sensor is soldered to the sensor substrate 201. The structure of the sensor substrate 201, the wiring 202, the groove 203, and the like is the same as that in the first embodiment.

  Next, the operation of the connection detection sensor 20 of the second embodiment will be described. As shown in FIG. 8A, when the half mirror holder 25 is fitted in the housing 2, the infrared light emitted from the infrared light emitting unit (not shown) of the connection detection sensor 20 is emitted from the half mirror holder 25. The light is reflected by the wall surface 253 (see FIG. 4) and received by the light receiving unit (not shown) of the connection detection sensor 20. On the other hand, as shown in FIG. 8B, when the half mirror holder 25 is not fitted in the housing 2, the infrared light emitted from the infrared light emitting unit (not shown) of the connection detection sensor 20 is It is not received by the light receiving part (not shown) of the connection detection sensor 20.

  The CPU 51 of the control device 50 detects whether or not the half mirror holder 25 is fitted in the housing 2 as follows. First, the CPU 51 of the control device 50 instructs the CPU 11 of the image display device 10 to operate the connection detection sensor 20 that is a distance sensor. The CPU 11 of the image display apparatus 10 operates the connection detection sensor 20 that is a distance sensor and measures the distance by reflected light. The CPU 11 transmits the measured result value to the CPU 51 of the control device 50. The CPU 51 determines that the half mirror holder 25 is attached to the housing 2 when the measurement result of the near reflection whose distance is equal to or less than the predetermined value is received. When the measurement result of the reflection whose distance is longer than the predetermined value is received, the CPU 51 determines that the half mirror holder 25 is not attached to the housing 2.

  Next, a third embodiment of the connection detection sensor 20 will be described with reference to FIG. The connection detection sensor 20 of the third embodiment uses a mechanical switch. As an example, a microswitch or the like is used. In the third embodiment shown in FIG. 9, as an example, the connection detection sensor 20 constituted by a micro switch is soldered to the sensor substrate 201. The structure of the sensor substrate 201, the wiring 202, the groove 203, and the like is the same as that in the first embodiment.

  Next, the operation of the connection detection sensor 20 of the third embodiment will be described. As shown in FIG. 9A, when the half mirror holder 25 is fitted in the housing 2, the push member 221 of the connection detection sensor 20 (see FIG. 9B) is the wall surface of the half mirror holder 25. The micro switch constituting the connection detection sensor 20 is turned on by being pushed in by H.253. On the other hand, as shown in FIG. 9B, when the half mirror holder 25 is not fitted in the housing 2, the push member 221 of the connection detection sensor 20 is not pushed in, and the connection detection sensor 20 Is turned off.

  The CPU 51 of the control device 50 detects whether or not the half mirror holder 25 is fitted in the housing 2 as follows. First, the CPU 51 of the control device 50 inquires of the CPU 11 of the image display device 10 whether the connection detection sensor 20 that is a microswitch is ON or OFF. The CPU 11 of the image display device 10 transmits the state of the connection detection sensor 20 that is a micro switch to the CPU 51 of the control device 50. The CPU 51 determines that the half mirror holder 25 is attached to the housing 2 when the connection detection sensor 20 is ON. When the connection detection sensor 20 is OFF, the CPU 51 determines that the half mirror holder 25 is not attached to the housing 2.

  In the above description, the projection unit 30 is an example of the “image light output unit” of the present invention, the electric substrate 205 is an example of the “electric substrate” of the present invention, and the half mirror 3 is the “deflection member” of the present invention. It is an example. The connection detection sensor 20 is an example of the “detection unit” of the present invention, the wiring 202 is an example of the “connection unit” of the present invention, and the reflective surface 3A is an example of the “reflective surface” of the present invention. The liquid crystal device 14 is an example of the “display surface” in the present invention, and the inner wall 283A is an example of the “inner wall” in the present invention.

  As described above, the HMD 1 according to the present embodiment is a see-through type head mounted display that is mounted on the user's head and displays an image superimposed on a light beam from the outside. The HMD 1 includes a liquid crystal device 14, an eyepiece optical unit 120, and a half mirror 3. The projection unit 30 emits image light toward the eyepiece optical unit 120. The eyepiece optical unit 120 collects the emitted image light and guides it to the half mirror 3. The half mirror 3 reflects at least a part of the image light that has passed through the eyepiece optical unit 120. When the HMD 1 is worn by the user, the image light reflected by the half mirror 3 enters the left eyeball of the user. The incident light is imaged on the retina by the crystalline lens of the eye, so that a virtual image (image) is visually recognized by the user. Further, since the HMD 1 includes the connection detection sensor 20 having a small and simple structure in the second joint end portion 274 of the housing 2, the control device determines whether or not the half mirror holder 25 is fitted in the housing 2. 50 CPUs 51 can judge. Therefore, in the HMD 1 of the present embodiment, the electrical configuration that can detect the attachment / detachment of the half mirror holder 25 from the housing 2 can be reduced in size and provided in the housing 2.

  Further, since the connection detection sensor 20 is connected to the electric board 205 that electrically controls the projection unit 30 by the wiring 202, the connection detection sensor 20 can also be controlled by the electric board 205. Accordingly, since the electric board 205 that electrically controls the projection unit 30 and the electric board that electrically controls the connection detection sensor 20 that detects the presence or absence of the half mirror holder 25 can be shared, the image display apparatus can be downsized. can do.

  The HMD 1 of the present embodiment is provided with an electric substrate 205 that is commonly used by the connection detection sensor 20 and the projection unit 30 along the display surface of the liquid crystal device 14 that forms an image to be reflected by the half mirror 3. Therefore, it is possible to avoid wasting space in the housing 2. In addition, since the wiring 202 that connects the connection detection sensor 20 and the electric board 205 is provided along the inner wall 283A in the housing 2 extending from the electric board 205 to the second joint end 274 along the first direction. The connection detection sensor 20 and the electric board 205 can be electrically connected without interfering with the optical path for outputting the image light. In addition, since the wiring 202 that connects the connection detection sensor 20 and the electric board 205 is accommodated in the groove 203 along the first direction, the wiring 202 does not move and does not obstruct the optical path for outputting image light. The connection detection sensor 20 and the electric substrate 205 can be electrically connected.

  In addition, this invention is not limited to the said embodiment, A various change is possible. For example, the electric board 205 and the projection unit 30 may be integrally formed. In this case, since the electric substrate 205 is integrated with the projection unit 30, the structure can be reduced in size. The determination of the presence or absence of the half mirror holder 25 may be performed by the CPU 11 of the image display device 10. Further, the position of the connection detection sensor 20 is not limited to the position of the above embodiment, and may be changed to an arbitrary position of the second joint end 274.

  In the above embodiment, the connection detection sensor 20 and the interface 18 may communicate wirelessly.

DESCRIPTION OF SYMBOLS 1 Head mounted display 3 Half mirror 3A Reflecting surface 10 Image display apparatus 14 Liquid crystal device 20 Connection detection sensor 25 Half mirror holder 30 Projection unit 202 Wiring 203 Groove 205 Electric substrate 283A Inner wall

Claims (7)

A housing,
An image light output unit that is provided in the housing and outputs image light forming an image in a first direction;
An electric board provided in the housing and electrically controlling the image light output unit;
A deflection member attachable to one end of the housing and deflecting the image light in a second direction different from the first direction;
A detection unit that is provided at the one end and detects whether the deflection member is attached to the housing;
A connection part for electrically connecting the detection part and the electric board ;
The image display device, wherein the electric substrate is formed integrally with the image light output unit . The deflection member is provided with a reflective surface for reflecting the image light in the second direction,
The image light output unit, the image formed on the predetermined display surface is output as the image light in the first direction, further, the image light output section, and opposed to the reflecting surface a said housing In place,
The image display device according to claim 1, wherein the electric substrate is provided along the display surface.   The image display device according to claim 2, wherein the image light output unit is provided in the casing so as to face the reflection surface. The housing includes an inner wall extending from the electric board to the one end along the first direction,
The image display device according to claim 2, wherein the connection portion is a wiring provided along the inner wall, and electrically connects the detection portion and the electric substrate. The inner wall is provided with a groove extending from the electric board to the one end along the first direction,
The image display device according to claim 4, wherein the wiring is provided along the groove. The detection unit, an image display apparatus according to any one of claims 1-5, wherein the light sensor der Rukoto for detecting the light deflected in the second direction from the deflection member. A head-mounted display comprising the image display device according to claim 1.

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