# US 2018/0024369 A1 · Head-Mounted Display > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0024369 A1 - Document ID: US20180024369A1 - Status: Published application - Kind: A1 - Application number: 15/550,825 - Filed: 2016-02-09 - Published: 2018-01-25 - Earliest claimed: 2015-02-17 - Assignees: Konica Minolta, Inc. - Applicants: Konica Minolta, Inc. - Inventors: Junichi KATO - Web page: https://patentgrep.com/patent/US20180024369A1 ## CPC - G02B 27/0176: {characterised by mechanical features} - G02B 5/32: Holograms used as optical elements - G02B 27/0172: {characterised by optical features} - G02C 5/124: {for vertically varying the position of the lenses} - G02C 11/10: {Electronic devices other than hearing aids} - H04N 5/64: Constructional details of receivers, e.g. cabinets or dust covers (furniture aspects {of television cabinets} A47B81/06) - G02B 2027/0158: {with adjustable nose pad} - G02B 2027/0159: {with mechanical means other than scaning means for positioning the whole image} - G02B 2027/0174: {holographic} - G02B 2027/0178: {Eyeglass type (eyeglass details G02C)} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - G02C: SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES (trial frames for testing the eyes A61B3/04; goggles or eyeshields not having the same features as spectacles A61F9/00) - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract A head mounted display (HMD) is provided with a frame worn on the head of an observer and supporting an optical unit, and a position adjusting mechanism. The position adjusting mechanism adjusts the position, in a vertical direction, of the optical unit by moving a nose-pad portion in the vertical direction relative to the frame. The optical unit includes: an observation optical system positioned in front of the eyes of the observer to cause light representing an image generated by an image generation unit to be diffracted and reflected by a hologram optical element in the direction of the observer's pupil, thereby enabling the observer to observe a virtual image of the image; and a rotating mechanism for causing the optical unit to rotate about an axis along the eye-width direction of the observer and to be held in an arbitrarily defined position. ## Claims ### Claim 1 A head-mounted display, comprising: an optical unit which enables an observer to observe a virtual image; a frame which is worn on a head part of the observer and which supports the optical unit; a nose rest which has a nose pad that makes contact with a nose part of the observer; and a position adjustment mechanism which, by moving the nose rest in an up-down direction perpendicular to an interpupillary distance direction of the observer in relative terms with respect to the frame, adjusts a position of the optical unit in the up-down direction, wherein the optical unit includes: an image generator which generates an image; an observation optical system which is disposed in front of an eye of the observer and which, by diffraction-reflecting light representing an image generated by the image generator in a direction of a pupil of the observer with a hologram optical element, enables the observer to observe a virtual image of the image; and a pivot mechanism which permits the optical unit to pivot about an axis along the interpupillary distance direction of the observer and which holds the optical unit at an arbitrary position. ### Claim 2 (depends on 1) The head-mounted display of claim 1, wherein the position adjustment mechanism includes: a fastening member to which the nose rest is fixed; a guide member which guides movement of the fastening member in the up-down direction; a holding member which holds the fastening member at an arbitrary position in the up-down direction; and a housing which is fixed to the frame and which supports the guide member and the holding member. ### Claim 3 (depends on 2) The head-mounted display of claim 2, wherein the holding member is composed of an elastic member that elastically deforms between a hold position for holding the fastening member at the arbitrary position in the up-down direction and a release position for releasing the fastening member from holding, the elastic member having an elastic force for returning from the release position to the hold position. ### Claim 4 (depends on 3) The head-mounted display of claim 3, wherein the elastic member is a plate spring of which an end part is fixed to the housing. ### Claim 5 (depends on 4) The head-mounted display of claim 4, wherein the plate spring has a projection that projects toward a side face of the fastening member parallel to the up-down direction, and the side face of the fastening member is formed of a corrugated surface on which a trough in which the projection fits to bring the plate spring into the hold position and a ridge on which the projection rides out of the trough to bring the plate spring into the release position are formed alternately in the up-down direction. ### Claim 6 (depends on 2) The head-mounted display of claim 2, wherein the fastening member has a through-hole that penetrates the fastening member in the up-down direction, and the guide member is put through the through-hole. ### Claim 7 (depends on 2) The head-mounted display of claim 2, wherein the fastening member has a through-hole that penetrates the fastening member in the up-down direction and that has a screw thread formed in an inner face thereof, the guide member is composed of a screw member that screw-engages with the screw thread in the inner face of the through-hole, and as the screw member rotates, the guide member guides and moves the fastening member in the up-down direction, and the holding member is composed of the screw member, and as the screw member stops rotating, the holding member holds the fastening member at the arbitrary position in the up-down direction. ### Claim 8 (depends on 2) The head-mounted display of claim 2, wherein the housing is fixed to a central part of the frame in the interpupillary distance direction. ### Claim 9 (depends on 2) The head-mounted display of claim 2, wherein the nose rest includes a coupling that couples together the fastening member and the nose pad, the fastening member includes a lens holder that holds at least one of a right-eye lens and a left-eye lens, and the housing has formed therein a cut-off part that forms a movement space for the coupling and the lens holder which move as the fastening member moves in the up-down direction. ### Claim 10 (depends on 9) The head-mounted display of claim 9, wherein the frame supports the optical unit such that the observation optical system is disposed on an opposite side of at least one of the right-eye and left-eye lenses from the observer. ### Claim 11 (depends on 1) The head-mounted display of claim 1, wherein the observation optical system includes an optical prism on which the hologram optical element is bonded, the optical prism has a light-exit face through which light emitted from the image generator, then guided inside the optical prism, and then diffraction-reflected by the hologram optical element emerges in a direction of the observer, and a pivot axis along the interpupillary distance direction of the optical unit in the pivot mechanism is located on a side of a plane including the light-exit face closer to the observer.