JP2012063465A - Image display apparatus - Google Patents

Abstract

[PROBLEMS] To prevent the holder from being easily removed from the housing by a force for rotating (opening / closing) the half mirror and not requiring a large force when the user consciously removes the holder. Provided is an image display apparatus that can
A housing housing an optical unit for projecting light according to an image signal, and a half mirror are pivotally supported, and are detachably attached to a front end opening of the housing via an attaching / detaching mechanism. The attaching / detaching mechanism resists even if a first force acting in a direction of dropping the holder from the housing is generated when the half mirror is rotated in the front opening direction. Even when a second force acting in the direction of dropping the holder from the housing occurs when the half mirror is rotated in the rearward closing direction, the holder can be removed. And a retaining means that can be prevented.
[Selection] Figure 3

Description

  The present invention relates to an image display device, and more particularly, to an image display device that visually recognizes an image by projecting light according to an image signal onto the eyes of a user.

  As an example of an image display device, a retinal scanning display (hereinafter referred to as “RSD”) is known. The RSD allows the observer to recognize an image by causing the scanned light beam to enter the eye of the user who is the user and projecting it onto the retina.

  As an image display apparatus including the RSD, for example, a case housing an optical unit including various lenses and optical elements for projecting a light beam, and a front-rear turnable portion are provided at the front end of the case. And a half mirror that reflects the light beam toward the user's eyes at a position opened to the front side (see, for example, Patent Document 1).

  The RSD according to Patent Document 1 is a head mounted display in which a half mirror is attached to a front end opening of a housing, and the housing having such a half mirror is attached to a spectacle-type head wearing tool.

  In addition, the half mirror included in the RSD of Patent Document 1 is provided so as to be able to rotate back and forth, and in use, the mirror surface is inclined with respect to the optical axis of the lens barrel and the eye. On the other hand, in the unused storage state, it faces directly so as to be substantially orthogonal to the optical axis of the lens barrel and is in a posture substantially orthogonal to the eye.

  On the other hand, if the half mirror can be removed from the housing, it becomes easier to repair, replace, and even clean the half mirror.Therefore, the technique of attaching the half mirror not directly to the housing but via the connecting member It has been proposed (see, for example, Patent Document 2).

  When this technique is applied to the configuration of Patent Document 1, a configuration is conceivable in which the half mirror is pivotally supported by a holder and the holder is detachably attached to the front end opening of the housing together with the half mirror.

  With such a configuration, as described above, repair and replacement of the half mirror, cleaning of the inside and outside of the front end of the half mirror and the lens barrel can be facilitated, and the half mirror is positioned immediately in front of the eyes. Safety is also expected to improve. That is, when some impact is applied to the lens barrel, if the half mirror is fixed, the half mirror itself may be broken. On the other hand, if the holder can be easily removed together with the half mirror, the possibility that the half mirror will break even if some impact is applied to the lens barrel is greatly reduced.

JP 2010-026193 A JP 2000-0567704 A

  As described above, when the holder for pivotally supporting the half mirror is configured to be detachably attached to the front end opening of the housing, the holder is required to be easily attached / detached from the viewpoint of safety and convenience. It is natural.

  On the other hand, it is conceivable that the half mirror is rotated (opened / closed) by hand while the housing is attached to the head mounting part. However, this structure is practical for the structure where the holder can be easily removed. It's not right. However, if the attachment of the holder to the housing is too strong, it is not preferable from the viewpoint of safety and usability as described above.

  As described above, in the image display device (for example, RSD) having the structure in which the holder for pivotally supporting the half mirror is detachably attached to the front end opening of the housing, both practical aspects and safety and usability are achieved. There was a new problem that would be difficult. Specifically, the force that rotates (opens and closes) the half mirror prevents the holder from being easily removed from the housing, and the user does not need a large force when consciously removing the holder. It was difficult to achieve both.

  The present invention has been made to solve the above-described new problem, and is an image display in which a holder for pivotally supporting a half mirror is attached to a front end opening of a housing via a specific attachment / detachment mechanism. The object is to provide a device.

  In order to solve the above-described problem, in the present invention described in claim 1, an image display device for projecting light according to an image signal to visually recognize an image on a user's eye, the light being projected. And a half mirror that is provided at the front end of the casing so as to be freely pivotable forward and backward, and reflects the light toward the user's eyes at a position opened to the front side. And a holder that is pivotally supported and removably attached to a front end opening of the housing via an attachment / detachment mechanism, and the attachment / detachment mechanism provided between the holder and the housing includes: Engagement means capable of resisting even when a first force acting in a direction of dropping the holder from the housing is generated when the half mirror is rotated in the front opening direction; When it is turned in the side closing direction , The second force acting in a direction to fall off the holder from the housing even occur, it was decided and a anchoring means which enables preventing falling of the holder.

  According to a second aspect of the present invention, in the image display device according to the first aspect, the engaging means is provided at a position separated from the pivotal support portion of the half mirror.

  According to a third aspect of the present invention, in the image display device according to the first or second aspect, the engaging means includes a hook formed on the holder side or the housing side, and the hook is freely detachable. Engaging recesses formed on the housing side or the holder side so that the holder is attached to the housing side, and the holder attached to the housing is detached. It consists of a convex part which prevents moving to.

  According to a fourth aspect of the present invention, in the image display device according to the third aspect, the holder includes a substantially rectangular frame portion that is in contact with the peripheral end surface of the housing, and extends from the frame portion to face each other. And the half mirror is pivotally supported at a position biased to one side in a plan view of the side wall portion, and the convex portion constituting the retaining means is formed on the half mirror. And is formed in a mountain shape having a first slope with a relatively steep slope toward the top and a second slope with a relatively gentle slope. The holder can be clamped between the slope and the peripheral end surface of the housing.

  Moreover, in this invention of Claim 5, in the image display apparatus of any one of Claims 1-4, it comprises so that the said housing can be mounted | worn on a user's head, and the said half mirror is used by a user It can be placed in front of the eyes.

  According to the present invention, the holder is not easily detached from the housing by only the force for rotating the half mirror back and forth, and the user consciously removes the holder without requiring a large force. Is possible. Therefore, both safety and usability can be improved.

1 is a perspective view illustrating an appearance of a retinal scanning image display device according to an embodiment that is an example of an image display device. It is a top view which shows the image display unit of the retina scanning type image display apparatus. It is explanatory drawing by plane sectional view of the image display unit. It is the same part longitudinal cross-sectional view. It is a reference figure which shows an example of the influence which operation of a half mirror has on a holder. It is explanatory drawing which shows the influence which operation of the half mirror in the retinal scanning-type image display apparatus which concerns on this embodiment has on a holder. It is a reference figure which shows an example of the influence which operation of a half mirror has on a holder. It is explanatory drawing which shows the influence which operation of the half mirror in the retinal scanning-type image display apparatus which concerns on this embodiment has on a holder. It is a reference drawing which shows an example of the operation | movement which extracts a holder from a housing. It is explanatory drawing which shows the operation | movement which extracts the holder in the retinal scanning-type image display apparatus which concerns on this embodiment from a housing.

[1. RSD: Retinal Scanning Display]
Hereinafter, an embodiment of an image display device according to the present invention will be described with reference to the drawings. As shown in FIG. 1, the image display device according to the present embodiment is a head-mounted display of a type that is worn on the head of a user who is an observer, and a laser corresponding to an image signal in the user's eyes. A retinal scanning image display device that projects image light made up of light or the like to visually recognize the image (hereinafter sometimes referred to as “RSD: Retinal Scanning Display”).

  That is, the RSD according to the present embodiment is configured such that the image display unit 1 is mounted on the head using the eyeglass-type frame 5 and the user can visually recognize the image in that state. Therefore, the user can freely use both hands while using the RSD.

  As shown in FIG. 1, the RSD includes a control unit 2 provided with a light source unit that emits light having an intensity corresponding to an image signal, and an image display unit that projects light onto a user's eyes to visually recognize an image. 1 is provided. The image display unit 1 and the control unit 2 are connected by a transmission cable 3 having an optical fiber.

  The image display unit 1 can be attached to the eyeglass-type frame 5 via the attachment 18 and mounted on the user's head, while the control unit 2 can be carried in a pocket of the user's clothes. It is said.

  As shown in FIGS. 1 and 2, the image display unit 1 is attached to the left side of the eyeglass-type frame 5 (as viewed from the user). Has a substantially L-shaped housing 4 in plan view.

  A scanning unit (not shown) for two-dimensionally scanning a light beam emitted from the light source unit of the control unit 2 and an optical unit 10 for projecting a laser beam (see FIGS. 2 to 4) ) Are provided. One end of the transmission cable 3 is connected to the base end portion 17 of the housing 4.

  In the projection unit arranged in the housing 4, the optical unit 10 is arranged at the rear stage of the scanning unit. The optical unit 10 includes a lens barrel 7 in which a lens unit including an eyepiece 12 (see FIGS. 3 and 4) that allows light scanned by the scanning unit to be incident on an observer's eye is accommodated. .

  A half mirror 9 is provided at the front end of the housing 4 of the image display unit 1 so as to face the user's eyes. As will be described in detail later, the half mirror 9 is pivotally supported by the mirror holder 8 so as to be able to rotate back and forth. The mirror holder 8 is detachably attached to the front end opening of the housing 4 via the attachment / detachment mechanism 11. Yes.

  And in the open position which rotated this half mirror 9 to the front side, the laser beam radiate | emitted from the optical unit 10 is reflected in the direction of a user's eye as image light.

  That is, the laser light intensity-modulated for each color (R, G, B) from the light source unit of the control unit 2 is scanned in a two-dimensional direction by the scanning unit of the projection unit, and the scanned laser beam is converted into the half mirror 9. Then, the laser beam is incident on the user's eye and the laser beam is scanned in a two-dimensional direction on the retina of the user's eye. Thus, the user visually recognizes an image corresponding to the image signal by the light scanned on the retina.

  Further, external light also passes through the half mirror 9 and enters the user's eyes. That is, the laser light emitted from the projection unit is reflected by the half mirror 9 and is incident on the user's eye, while the external light is transmitted through the half mirror 9 and is incident on the user's eye. Therefore, the user can visually recognize the image by the laser beam superimposed on the outside scene by the external light.

  As described above, the RSD according to the present embodiment is a see-through type that projects laser light having an intensity corresponding to an image signal to a user's eye while transmitting external light. However, the optical unit according to the present invention is not applied only to the see-through type RSD, and can be widely used. Here, laser light that is advantageous in terms of efficiency is used as an example of light, but the light is not necessarily limited to laser light.

  By the way, the control unit 2 includes an external input / output terminal (not shown), and an external image signal can be input through the external input / output terminal. In addition, content information for forming an image signal can be transmitted / received to / from a personal computer (not shown) via the external input / output terminal. The control unit 2 forms an image signal based on the received content information, and emits laser light having an intensity corresponding to the image signal to the optical fiber of the transmission cable 3 as image light.

  The eyeglass-type frame 5 includes a front portion 15 and left and right temple portions 16 and 16. And the temple part 16 is set as the structure provided with the suspension structure 16a which formed the middle part in the Z shape by planar view and side view so that the amount of bending can be increased. Therefore, the temple portion 16 bends and changes its shape according to the difference in the user's head shape, so that it can be fitted to various user's heads as much as possible. And by mounting | wearing the spectacles type | mold flame | frame 5 to a head, the half mirror 9 provided in the front-end | tip part of the image display unit 1 can be arrange | positioned easily in front of eyes.

[2. Half mirror holder]
Here, the mirror holder 8 serving as a main part of the present embodiment will be described with reference to FIGS. In the present embodiment, the mirror holder 8 is made of synthetic resin.

  As shown in FIGS. 2, 3, and 4, the mirror holder 8 includes a substantially rectangular frame portion 81 that is in contact with the peripheral end surface of the front end opening of the housing 4, and extends from the frame portion 81 to face each other. The half mirror 9 is pivotally supported by a pivotal support part 83 formed from the side wall parts 82 and 82 and provided at a position biased to one side in a plan view of the side wall parts 82 and 82. In addition, the pivot part 83 is comprised from the protrusion part which protruded in the half mirror 9, and the engagement hole which was formed in the mirror holder 8 and engaged with each protrusion part in the loose fitting state, and was rotatable. .

  As shown in FIG. 3, the half mirror 9 is formed in a substantially square shape in plan view. That is, the half mirror 9 is formed with projections constituting the pivotal support portion 83 in the middle and upper positions of the reflecting surface 91 extending forward, and the user can perform an opening / closing operation on the base end side of the reflecting surface 91. A knob portion 92 for contacting the finger is formed.

  Then, by operating the knob 92, the half mirror 9 can be rotated back and forth (sometimes referred to as opening and closing) about the pivot 83. Note that a part of the frame portion 81 of the mirror holder 8 functions as a stopper 81a that restricts rotation in the opening direction when the half mirror 9 is rotated to the front side to be in the open state.

  In this embodiment, such a mirror holder 8 is detachably attached to the front end opening of the housing 4 via an attachment / detachment mechanism having a configuration described below.

  Here, a lens holder 71 for holding the eyepiece 12 is provided at the tip of the lens barrel 7 of the optical unit 10 housed in the housing 4. That is, the front end side of the lens holder 71 is disposed in the housing 4 in a state of being partially protruded from the front end opening of the housing 4. In this embodiment, the front end opening of the housing 4 is substantially Indicates the tip of the lens holder 71. Therefore, in this embodiment, the attachment / detachment mechanism provided between the mirror holder 8 and the housing 4 is substantially provided between the lens holder 71 and the mirror holder 8.

  The concept of attaching the mirror holder 8 to the housing 4 includes attaching to the lens barrel 7 and the lens holder 71 disposed inside the housing 4 as in the present embodiment. The holder 8 may be detachably attached to the member itself constituting the housing 4.

  The attachment / detachment mechanism according to the present embodiment includes an engagement portion 84 that is an engagement means for engaging the mirror holder 8 with the lens holder 71 (housing 4), and the mirror holder 8 is prevented from dropping from the lens holder 71 (housing 4). It is comprised from the convex-shaped part as a retaining means provided in order to prevent.

  In the present embodiment, as shown in FIG. 4, the engaging portion 84 is provided on a hook 84a formed on the mirror holder 8 and a lens holder 71 located on the front end side of the housing 4 so as to engage with the hook 84a. The engaging recess 84b is formed. The hook 84a is formed at the tip of an extending piece having elasticity that extends from the front to the rear inside the mirror holder 8.

  If the half mirror 9 contacts the stopper 81a (see FIG. 3) when the knob portion 92 is operated to rotate the half mirror 9 in the front opening direction, further rotation operation causes the mirror holder 8 to move. This is the force (first force) that causes the lens holder 71 to fall off.

  That is, assuming that the point acting on the knob portion 92 is a force point, the stopper 81a of the frame portion 81 of the mirror holder 8 serves as a fulcrum, and the engaging portion 84 acts in the direction of dropping the mirror holder 8 from the lens holder 71. It becomes the point of action of force.

  Therefore, in the present embodiment, the engaging portion 84 is provided at a position as far as possible from the stopper 81a of the frame portion 81 of the mirror holder 8 serving as a fulcrum, and the first force is made possible by the principle of “lever”. (See FIG. 6). That is, when the region in the width direction of the mirror holder 8 or the lens barrel 7 is divided into left and right by the center line, the engaging portion 84 is positioned at least in the region opposite to the stopper 81a. In the present embodiment, as shown in FIG. 6, the engaging portion 84 is provided in the vicinity of the end portion on the opposite side of the stopper 81 a and the pivotal support portion 83 in the mirror holder 8 and the lens barrel 7. Thus, since the engaging part 84 is provided at a position separated from the pivotal support part 83 of the half mirror 9, the mirror holder 8 is detached from the lens holder 71 when the half mirror 9 is rotated in the front opening direction. It can effectively resist the force acting on. By the way, the engaging force in the engaging portion 84 may be set as appropriate according to the force required to remove the mirror holder 8 from the housing 4 side.

  In this way, even when the first force acting in the direction of dropping the mirror holder 8 from the lens holder 71 is generated when the knob portion 92 is pushed forward and the half mirror 9 is rotated in the front opening direction, this is resisted. It is possible to prevent the mirror holder 8 from easily falling off the lens holder 71.

  Further, as shown in FIG. 3, the convex portion as the retaining means is provided as a convex portion 85 on the lens holder 71 on the housing 4 side, and the position thereof is on the side of the pivotal portion 83 of the half mirror 9. Yes. The convex portion 85 prevents the mirror holder 8 attached to the lens holder 71 (the casing 4) from moving in the separating direction.

  That is, when the half mirror 9 is rotated in the rearward closing direction by operating the knob portion 92 and the half mirror 9 comes into contact with the frame portion 81 of the mirror holder 8 to be in the closed state, the further rotation is performed. The operation also becomes a force (second force) that attempts to drop the mirror holder 8 from the lens holder 71.

  Thus, when the half mirror 9 is rotated in the rearward closing direction, a second force acting in the direction of dropping the mirror holder 8 from the lens holder 71 is generated, and the mirror holder 8 moves in the detaching direction. Even when trying to do so, the mirror holder 8 is prevented from falling off because it comes into contact with the convex portion 85.

  The convex portion 85 will be described in more detail. As shown in FIG. 3, the convex portion 85 according to the present embodiment is relatively inclined with the first inclined surface 85a having a relatively steep inclination toward the top. It is formed in a mountain shape having a gentle second slope 85b.

  Thus, the convex portion 85 is configured to firmly hold the frame portion 81 of the mirror holder 8 between the first inclined surface 85a and the peripheral end surface of the lens holder 71, and the mirror holder 8 is attached to the housing 4 side. In this case, the slope of the second slope 85b is made gentle so that the frame part 81 of the mirror holder 8 can easily get over. In addition, as a shape of the convex part 85, it is not necessarily limited to the above-mentioned shape. As long as it can prevent at least the mirror holder 8 from moving in the direction of separation.

[3. About the action of the attachment / detachment mechanism]
Here, with reference to FIGS. 5 to 9, the operation of the attachment / detachment mechanism including the engaging portion 84 and the convex portion 85 will be described. With regard to the relationship between the opening / closing operation of the half mirror 9 pivotally connected to the mirror holder 8 and the ease with which the mirror holder 8 is detached from the lens holder 71 (housing 4) due to this opening / closing operation, the attachment / detachment function is specifically described. Explain how it works.

  5 and 7 are reference diagrams showing an example (reference example) of the influence of the operation of the half mirror on the mirror holder. FIG. 5 shows the case of the opening operation and FIG. 7 shows the case of the closing operation. 6 and 8 are explanatory diagrams showing the influence of the operation of the half mirror 9 on the mirror holder 8 in the retinal scanning image display apparatus according to the present embodiment. FIG. 6 shows an opening operation, and FIG. 8 shows a closing operation. This case is shown. FIG. 9A is a reference diagram illustrating an example of an operation of extracting the mirror holder from the housing, and FIG. 9B is an explanatory diagram illustrating an operation of extracting the mirror holder 8 from the lens holder 71 (housing 4) in the present embodiment.

  Note that the structural difference between the present embodiment and the reference example is that the reference example is not provided with the convex portion 85, and the engagement portion 840 in the reference example and the engagement portion 84 according to the present embodiment are different. Then, only the arrangement is different. That is, both the configuration of the engaging portions 84 and 840 and the engaging force thereof are the same, and the engaging force is appropriately set according to the force necessary to consciously remove the mirror holder 8 from the housing 4 side. Yes.

  As shown in the reference diagram of FIG. 5, if the engaging portion 840 is a normal configuration arranged in the approximate center of the mirror holder 800 and the housing 400 in plan view, a finger or the like is applied to the base end portion of the half mirror 900. When the half mirror 900 comes into contact with the stopper 810 when it is rotated in the front opening direction (arrow f1 in FIG. 5A), further rotation operation (arrow f2 in FIG. 5B) is performed. The force (first force) that causes the mirror holder 800 to fall off the housing 400 is obtained.

  That is, from the principle of “lever”, as shown in FIG. 5B, when the point where the finger abuts against the half mirror 900 (the point acting on the knob portion 92) is a power point, the stopper 810 of the mirror holder 800 is a fulcrum. Thus, the engaging portion 840 serves as a point of action of the first force that acts in the direction of dropping the mirror holder 800 from the housing 400. Accordingly, since the distance from the fulcrum is short, the mirror holder 800 is easily detached from the housing 400 depending on the force pressed by the finger.

  Therefore, in the present embodiment, as shown in FIG. 6, by providing the engaging portion 84 serving as the action point as far as possible from the stopper 81a of the frame portion 81 of the mirror holder 8 serving as the fulcrum, The first force generated by the rotation operation (arrow f2) after the half mirror 9 contacts the stopper 81a is made as small as possible.

  Thus, when the knob 92 (see FIG. 3) is pushed forward and the half mirror 9 is rotated in the front opening direction, the mirror holder 8 acts in a direction to drop off from the housing 4 (substantially the lens holder 71). Even if the first force is generated, the engaging portion 84 can resist this, and the mirror holder 8 can be prevented from easily falling off from the housing 4 (lens holder 71).

  Further, as shown in the reference diagram of FIG. 7, when the finger is applied to the base end portion of the half mirror 900 and rotated in the rear closing direction (arrow f <b> 3 in FIG. 7A), the half mirror 900. When it comes into contact with the tip of the housing 400 and closes, the further pivoting operation (arrow f4 in FIG. 7 (b)) also forces the mirror holder 800 to drop from the housing 400 (second Power).

  However, since the attaching / detaching mechanism of the present embodiment includes the convex portion 85, as shown in FIG. 8, when the half mirror 9 is rotated in the rearward closing direction, the half mirror 9 is the mirror holder. Even if a second force acting in the direction of dropping the mirror holder 8 from the housing 4 (substantially the lens holder 71) is generated by the rotation operation (arrow f4) after coming into contact with the mirror 8, the mirror holder 8 Since the movement is prevented by coming into contact with the convex portion 85 (see FIG. 3) even if trying to move in the separating direction, the mirror holder 8 is prevented from falling off.

  Moreover, the convex part 85 provided in the housing 4 side is provided in the pivot part 83 side of the half mirror 9. That is, the convex portion 85 is provided on the side surface of the lens holder 71 that is opposite to the user's eye. Therefore, even when the mirror holder 8 may come off in a state where the image display unit 1 is mounted on the head, the mirror holder 8 comes off in the direction away from the eyes with the convex portion 85 as a fulcrum, so The surface can be further improved.

  By the way, when removing the mirror holder 8 from the housing 4 for cleaning the half mirror 9 and the eyepiece 12, as shown in FIG. 9A, the force required for the removal is compared with FIG. 9b showing the reference example. But it doesn't change.

  That is, as described above, the engagement portion 840 according to the reference example (see FIG. 9A) and the engagement portion 84 according to the present embodiment (see FIG. 9B) are different only in the arrangement, and the engagement force is the same. It is said. Further, the widths of the housing 4 and the mirror holder 8 are not different from the width of the human thumb. Therefore, when the mirror holder 8 is picked up with a finger and is pulled out in the axial direction of the housing 4, the pulling force is substantially the same for both.

  In order to reduce the pulling force as much as possible, it is preferable to place a finger at a position that overlaps with the engaging portion 84 without shifting. Therefore, it is possible to provide a mark on the outer peripheral surface of the mirror holder 8 so as to overlap with the position where the engaging portion 84 is provided, and to urge the user to put a finger on the mark. Further, the mark may be formed by a depression or the like instead of being planar, so that the user can easily pick it up.

  According to the embodiments described above, an RSD (image display device) that achieves the following effects can be realized.

  (1) An RSD (image display device) for projecting laser light (light according to an image signal) onto a user's eye to visually recognize an image, and housing an optical unit 10 for projecting the laser light A housing 4, a half mirror 9 that is provided at the front end of the housing 4 so as to be pivotable forward and backward, and reflects the laser light toward the user's eyes in a position opened to the front side, and the half mirror 9 is pivoted A mirror holder 8 that pivots freely and is detachably attached to a lens holder 71 (a tip opening portion of the casing 4) disposed inside the casing 4 via an attaching / detaching mechanism. The attachment / detachment mechanism provided between the lens holder 71 (housing 4) causes the mirror holder 8 to drop from the lens holder 71 (housing 4) when the half mirror 9 is rotated in the front opening direction. First acting When the engaging portion 84 (engaging means) that can resist even if force is generated and the half mirror 9 is rotated in the rearward closing direction, the mirror holder 8 is dropped from the lens holder 71 (housing 4). An RSD (image display device) comprising a convex portion (a retaining means) capable of preventing the mirror holder 8 from falling off even when a second force acting in the direction to be generated occurs.

  According to such a configuration, the mirror holder 8 is not easily detached from the lens holder 71 (the casing 4) only by the force for rotating the half mirror 9 back and forth, and the user needs a large force. The mirror holder 8 can be intentionally removed without any problem. Therefore, both safety and usability can be improved.

  (2) An RSD (image display device) in which the engagement portion 84 (engagement means) is provided at a position separated from the pivotal support portion 83 of the half mirror 9 in the above configuration.

  According to such a configuration, the mirror holder 8 is removed from the lens holder 71 (the casing 4) when the half mirror 9 is rotated in the front opening direction only by changing the arrangement of the engaging portion 84. It can effectively resist the force to do. Moreover, the engaging force in the engaging portion 84 can be set as appropriate according to the force necessary to remove the mirror holder 8 from the housing 4 side.

  (3) In the above configuration, the engagement portion 84 (engagement means) is detachably engageable with the hook 84a formed on the mirror holder 8 side or the lens holder 71 (housing 4) side, and the hook 84a. The engaging recess 84b is formed on the lens holder 71 (housing 4) side or the mirror holder 8 side so as to be engaged, and the convex portion 85 (preventing means) is on the lens holder 71 (housing 4) side. RSD (image display device) comprising a convex portion 85 that is provided on the lens holder 71 and prevents the mirror holder 8 attached to the lens holder 71 (housing 4) from moving in the detaching direction.

  According to this configuration, the effects (1) and (2) can be more reliably generated with a simple configuration.

  (4) In the above-described configuration, the mirror holder 8 includes a substantially rectangular frame portion 81 that contacts the peripheral end surface of the lens holder 71 (housing 4), and side wall portions 82 that extend from the frame portion 81 and face each other. , 82 and pivotally supports the half mirror 9 at a position biased to one side in a plan view of the side wall portions 82, 82, while the convex portion 85 is pivoted on the half mirror 9. The first inclined surface is formed in a mountain shape having a first inclined surface 85a having a relatively steep inclination toward the top and a second inclined surface 85b having a relatively gentle inclination. An RSD (image display device) that allows the frame portion 81 of the mirror holder 8 to be sandwiched between 85a and the peripheral end surface of the lens holder 71 (housing 4).

  According to such a configuration, since the frame portion 81 of the mirror holder 8 can easily get over the second inclined surface 85b, in addition to the effect of the above (3), resistance when the mirror holder 8 is mounted on the housing 4 side. Can be made as small as possible, and handling performance can be improved.

  (5) An RSD (image display device) in which the housing 4 is configured to be attachable to the user's head and the half mirror 9 can be disposed in front of the user's eyes.

According to such a configuration, since the user can use his / her hands freely, the half mirror 9 can be opened / closed and the mirror holder 8 can be attached / detached while the image display unit 1 is mounted, and the usability as an RSD is good. It becomes.
(6) An RSD (image display device) in which the mark is provided on the outer peripheral surface of the mirror holder 8 so as to overlap with the position where the engaging portion 84 is provided.

  According to such a configuration, when the finger is placed on the mark and the mirror holder 8 is gripped and pulled out in the axial direction of the housing 4, the pulling force is further reduced and the usability is further improved.

  In the embodiment described above, the image display device is RSD. However, the image display device is not necessarily RSD. For example, an image of a liquid crystal display element may be projected and displayed by an eyepiece or a half mirror.

DESCRIPTION OF SYMBOLS 1 Image display unit 4 Housing 7 Mirror tube 8 Mirror holder 9 Half mirror 10 Optical unit 81 Frame part 82 Side wall part 83 Pivot part 84 Engagement part 84a Hook 84b Engagement recessed part 85 Convex part 85a 1st slope 85b 2nd slope

Claims (5)

An image display device for projecting light according to an image signal to a user's eye to visually recognize an image,
A housing containing an optical unit for projecting the light;
A half mirror which is provided at the front end portion of the housing so as to be pivotable back and forth, and reflects the light in the direction of the user's eye at a position opened to the front side;
A holder that pivotally supports the half mirror and is detachably attached to the front end opening of the housing via an attachment / detachment mechanism;
With
The attachment / detachment mechanism provided between the holder and the housing is,
Engagement means capable of resisting the occurrence of a first force acting in a direction of dropping the holder from the housing when the half mirror is rotated in the front opening direction;
Retaining means capable of preventing the holder from falling off even when a second force acting in the direction of dropping the holder from the housing occurs when the half mirror is rotated in the rearward closing direction. ,
An image display device comprising:   2. The image display device according to claim 1, wherein the engaging means is provided at a position separated from the pivotal support portion of the half mirror. The engaging means includes
A hook formed on the holder side or the housing side, and an engagement recess formed on the housing side or the holder side so as to be detachably engaged with the hook,
The retaining means is
3. The image display device according to claim 1, further comprising a convex portion provided on the housing side and configured to prevent the holder attached to the housing from moving in a detaching direction. The holder is formed of a substantially rectangular frame portion that abuts on the peripheral end surface of the housing and side wall portions that extend from the frame portion and face each other, and are displaced to one side in plan view of the side wall portions. While pivoting the half mirror in a freely rotatable manner,
The convex portion constituting the retaining means is disposed on the pivotal support side of the half mirror, and the first slope having a relatively steep slope toward the top and the second slope having a relatively gentle slope. 3. The image display device according to claim 2, wherein the frame portion of the holder can be sandwiched between the first inclined surface and the peripheral end surface of the housing.   The image display device according to claim 1, wherein the housing is configured to be attachable to a user's head, and the half mirror can be disposed in front of the user's eyes.

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