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  Wearable display unit, headphones and system provided with theseUSPTO Application #: 20060238878Title: Wearable display unit, headphones and system provided with these Abstract: Inclination of an image display unit is prevented at the time of using a wearable display unit in which the image display unit can move between a projection position where the image display unit comes in front of a user's eye and a retracted position where the image display unit has been retracted from the front of the user's eye. A display support member 27 is prevented from rotating in relation to a display support member housing part 31 in a direction included in a plane perpendicular to the longitudinal direction of the display support member 27, even in a state that the display support member can move. To that end, grooves 28a, 28b extending in the longitudinal direction are formed in the display support member 27, while guide rollers 34a, 34a in contact with these grooves are provided within the display support member housing part 31. (end of abstract) Agent: Klarquist Sparkman, LLP - Portland, OR, US Inventors: Nobuyuki Miyake, Shigeru Kato, Masaki Ootsuki USPTO Applicaton #: 20060238878 - Class: 359630000 (USPTO) The Patent Description & Claims data below is from USPTO Patent Application 20060238878. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS REFERENCE TO RELATED APPLICATION [0001] This is a continuation application of, and claims benefit from, corresponding international application PCT/JP2004/19352, filed Dec. 24, 2004, which claims priority from Japan Patent Application No. 2003-434294, filed Dec. 26, 2003, Japan Patent Application No. 2004-002834, filed Jan. 8, 2004, Japan Patent Application No. 2004-010781, filed Jan. 19, 2004, Japan Patent Application No. 2004-103723, filed Mar. 31, 2004, and Japan Patent Application No. 2004-103724, filed Mar. 31, 2004, all of which applications are incorporated herein by reference. BACKGROUND [0002] The present disclosure relates to a wearable display unit provided with an image display unit for displaying an image in front of an eye of a user and the image display unit can be arranged near a user's eye, headphones attached to the wearable display unit, and a system provided with these components. [0003] As a device for displaying an image in front of an eye of a user, there is a device called a wearable display unit or a head-mounted display. [0004] For example, the below-mentioned Non-patent Document 1 shows a conventional device of such a type. [0005] A wearable display unit described in Non-patent Document 1 comprises: an image display unit; a round-bar-shaped display support member whose end fixes the image display unit; a display support member holding part that supports the display support member slidably; and a head mounting belt to which the display support member holding part is attached. The display support member holding part comprises: a display support member housing that houses the display support member; and a restricting screw for restricting the display support member such that the display support member can not move relatively to the display support member housing. The display support member housing is formed with a display support member through hole for inserting the display support member and a threaded hole extending in the direction intersecting the display support member through hole. The restricting screw is screwed into the threaded hole and presses the display support member in the display support member housing to restrict the display support member such that the display support member can not move. [0006] To use this wearable display unit, first the head mounting belt is put on the head of a user. Then, the restricting screw is loosened to pull out the display support member from the display support member housing such that the image display unit is led to the front of a user's eye. Then, the display support member is rotated slightly in relation to the display support member housing around the longitudinal axis of the display support member, to adjust the inclination of the image display unit. Thereafter, the restricting screw is screwed into the display support member housing to restrict the display support member such that the display support member can neither move nor rotate . . . [0007] Other related techniques are displayed in the below-mentioned Patent Documents 1, 2 and 3. [0008] A wearable display unit described in Patent Document 1 has a head mounting belt and a display device. Mechanical structures for fixing the display device unit are provided to the head mounting belt in the neighborhoods of the right and left eyes, respectively. Thus, since this wearable display unit is provided with the mechanical structures for fixing the display device unit at the portions of the head mounting belt in the neighborhoods of the right and left eyes respectively, it is possible to place the display device unit both in the neighborhood of the right eye and in the neighborhood of the left eye. [0009] Patent Document 2 describes a wearable display unit whose image display unit is provided with an anti-swing member that can be in contact with a nose of a user to avoid effect of unintended movement of the image display unit owing to a motion of the user. [0010] A wearable display unit described in Patent Document 3 comprises: an image display unit for displaying an image in front of a user's eye; a head mounting member to be mounted on the head of the user; a display support member that supports the image display unit; and a coupling member for coupling the display support member to the head mounting member. This wearable display unit has a spherical seat at a portion of connection between the display support member and the coupling member so that the image display unit fixed to the end of the display support member can swing in various directions together with the display support member. [0011] Non-patent Document 1: Interactive Imaging Systems Second Sight, 1/2 page, retrieved on Dec. 9, 2004, Internet <URL:http://www.iisvr.com/products_mobility_Main.html> [0012] Patent Document 1: Japanese Non-examined Patent Laid-Open No. 10-74051, FIG. 2 [0013] Patent Document 2: Japanese Non-examined Patent Laid-Open No. 2000-3143, FIG. 1 [0014] Patent Document 3: Japanese Non-examined Patent Laid-Open No. 2000-3143, FIGS. 2 and 6 SUMMARY [0015] According to the technique described in Non-patent Document 1, the center of gravity of the image display unit does not exist on the axis of the display support member. Thus, when the wearable display unit is used in a state that the image display unit is positioned in front of a user, sometimes the weight of the image display unit generates force causing the display support member to rotate on its longitudinal axis and, as a result, the image display unit to incline. In particular, when the head of the user using the wearable display unit moves rapidly, the image display unit frequently inclines downward even if the restricting screw has been screwed tightly to some degree. [0016] The present invention has been made considering these conventional problems. An object of the present invention is to provide a wearable display unit that can prevent downward inclination of an image display unit at the time of using, headphones that can be fixed to this wearable display unit, and a system provided with these. [0017] To solve the above problems, one aspect of the invention provides a wearable display unit having an image display unit for displaying an image in front of an eye of a user and the image display unit of which can be arranged near a user's eye. An embodiment of the unit comprises a display support member that has a bar shape and is fixed to the image display unit. The unit also comprises a display support member holding part that holds the display support member movably between a projecting position where the image display unit can be positioned in front of the eye of the user and a retracted position where the image display unit has been retracted from the front of the eye of the user. The unit also comprises an anti-rotation means that prevents rotation of the display support member in relation to the display support member holding part in a neighborhood of, and including at least, the projecting position between the projecting position and the retracted position, with respect to rotation in a direction within a plane nearly perpendicular to a longitudinal direction of the display support member, even when the display support member is in a movable state. [0018] In the wearable display unit, the anti-rotation means can comprise an anti-rotation-shape part formed, at least in a part of the display support member, to have an outer peripheral shape of a cross section having parts whose distances from a center of gravity in the cross section are different from each other. The cross section can be perpendicular to the longitudinal direction of the display support member. The anti-rotation means also can include an abutting part that is a part of the display support member holding part and cannot be rotated in a sense of the rotation, with the abutting part abutting on the anti-rotation-shape part of the display support member at least in the neighborhood of the projecting position. [0019] In another embodiment the anti-rotation means comprises an anti-rotation-shape part formed, at least in a part of the display support member, to have an outer peripheral shape of a cross section different from a circle, with the cross section being perpendicular to the longitudinal direction of the display support member. The anti-rotation means also comprises an abutting part that is a part of the display support member holding part and cannot be rotated in a sense of the rotation, with the abutting part abutting on the anti-rotation-shape part of the display support member at least in the neighborhood of the projecting position. [0020] The outer peripheral shape of the cross section of the display support member can be different between on a tip end side to which the image display unit is fixed and on a base end side opposite to the tip end side. The base end portion of the display support member can form the anti-rotation-shape part. [0021] The outer peripheral shape of the cross section on the tip end side of the display support member can be a circle. Continue reading... Full patent description for Wearable display unit, headphones and system provided with these Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Wearable display unit, headphones and system provided with these patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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