# US 11,442,270 B2 · Virtual reality head-mounted apparatus with a partial-reflection partial-transmission wedge > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,442,270 B2 - Document ID: US11442270B2 - Status: Granted - Kind: B2 - Application number: 16/511,353 - Filed: 2019-07-15 - Published: 2019-11-07 - Granted: 2022-09-13 - Earliest claimed: 2017-02-27 - Assignees: Advanced New Technologies Co., Ltd. - Applicants: Advanced New Technologies Co., Ltd. - Inventors: Hong Zhang - Web page: https://patentgrep.com/patent/US11442270B2 ## CPC - G02B 27/0172: {characterised by optical features} - G06F 3/013: {Eye tracking input arrangements (G06F3/015 takes precedence)} - G02B 27/0093: {with means for monitoring data relating to the user, e.g. head-tracking, eye-tracking} - G02B 27/0955: {Lenses (lenses per se G02B3/00)} - G02B 27/141: {using dichroic mirrors} - G02B 2027/0138: {comprising image capture systems, e.g. camera} - G02B 2027/014: {comprising information/image processing systems} - G02B 2027/0178: {Eyeglass type (eyeglass details G02C)} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) ## Abstract Methods, systems, and apparatus for a virtual reality (VR) head-mounted apparatus are provided. One of the apparatus includes a convex lens, a camera and a partial-reflection partial-transmission lens. The partial-reflection partial-transmission lens is located on a side of the convex lens towards a user when the user wears the VR head-mounted apparatus, and a lens surface of the partial-reflection partial-transmission lens is disposed obliquely to reflect an infrared image of an eye of the user to the camera. The VR head-mounted apparatus improves the acquisition accuracy for an infrared image of an eye of the user. ## Claims ### Claim 1 A virtual reality (VR) head-mounted apparatus, comprising: a convex lens; a first camera located at a top of the VR head-mounted apparatus; a second camera located at a bottom of the VR head-mounted apparatus; and a partial-reflection partial-transmission wedge for reflecting infrared light, wherein the partial-reflection partial-transmission wedge is located on a side of the convex lens towards a user when the user wears the VR head-mounted apparatus, wherein the partial-reflection partial-transmission wedge comprises an upper structure and a lower structure connected at a joint of the upper structure and the lower structure, the upper structure and the lower structure contacting the convex lens, the upper structure having an upper-front surface facing towards the user and an upper-back surface facing away from the user, the upper-front surface configured to reflect a light from the user towards the first camera, the upper-front surface being a surface of the upper structure closest to the user, the upper-back surface being a surface of the upper structure closest to the convex lens, the upper-front surface substantially parallel with the upper-back surface, the lower structure having a lower-front surface facing towards the user and a lower-back surface facing away from the user, the lower-front surface configured to reflect the light from the user towards the second camera, the lower-front surface being a surface of the lower structure closest to the user, the lower-back surface being a surface of the lower structure closest to the convex lens, and the lower-front surface substantially parallel with the lower-back surface, wherein the upper-front surface and the lower-front surface are planar surfaces, the upper-front surface and the lower-front surface form a first obtuse angle at the joint of the upper structure and the lower structure, the upper-back surface of the upper structure and the lower-back surface of the lower structure forming a second obtuse angle at the joint of the upper structure and the lower structure. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the partial-reflection partial-transmission wedge has a higher transmittance for visible light than for infrared light. ### Claim 3 (depends on 1) The apparatus of claim 1, wherein the partial-reflection partial-transmission wedge comprises an infrared dichroic mirror. ### Claim 4 (depends on 3) The apparatus of claim 3, wherein the infrared dichroic mirror comprises a TiO2—Ag—TiO2 infrared reflective film or a ZnS—Ag—ZnS infrared reflective film. ### Claim 5 (depends on 1) The apparatus of claim 1, wherein the first camera is located outside a visible area of the convex lens with respect to the user. ### Claim 6 (depends on 1) The apparatus of claim 1, wherein the joint of the upper structure and the lower structure is located in the middle of the partial-reflection partial-transmission wedge. ### Claim 7 (depends on 6) The apparatus of claim 6, wherein the upper structure and the lower structure are symmetrical with respect to a horizontal plane going through the middle of the partial-reflection partial-transmission wedge. ### Claim 8 (depends on 1) The apparatus of claim 1, wherein the joint of the upper structure and the lower structure is located at an upper part of the partial-reflection partial-transmission wedge. ### Claim 9 (depends on 1) The apparatus of claim 1, further comprising: a protective frame, which forms an accommodating space adapted to the partial-reflection partial-transmission wedge and the convex lens, so as to accommodate and fix the partial-reflection partial-transmission wedge and the convex lens to the apparatus. ### Claim 10 (depends on 1) The apparatus of claim 1, further comprising: an adjustment component configured to perform angle adjustment on the first camera, such that a lens of the first camera is kept towards a virtual infrared image of the eye formed by the partial-reflection partial-transmission wedge. ### Claim 11 A virtual reality (VR) apparatus, comprising: a convex lens; a first camera located at a top of the VR apparatus; a second camera located at a bottom of the VR apparatus; a partial-reflection partial-transmission wedge for reflecting infrared light, wherein the partial-reflection partial-transmission wedge is located on a side of the convex lens towards a user when the user wears the VR apparatus, wherein the partial-reflection partial-transmission wedge comprises an upper structure and a lower structure connected at a joint of the upper structure and the lower structure, the upper structure and the lower structure contacting the convex lens, the upper structure having an upper-front surface facing towards the user and an upper-back surface facing away from the user, the upper-front surface configured to reflect a light from the user towards the first camera, the upper-front surface being a surface of the upper structure closest to the user, the upper-back surface being a surface of the upper structure closest to the convex lens, the upper-front surface substantially parallel with the upper-back surface, the lower structure having a lower-front surface facing towards the user and a lower-back surface facing away from the user, the lower-front surface configured to reflect the light from the user towards the second camera, the lower-front surface being a surface of the lower structure closest to the user, the lower-back surface being a surface of the lower structure closest to the convex lens, the lower-front surface substantially parallel with the lower-back surface, wherein the upper-front surface and the lower-front surface are planar surfaces, the upper-front surface and the lower-front surface form a first obtuse angle at the joint of the upper structure and the lower structure, the upper-back surface of the upper structure and the lower-back surface of the lower structure forming a second obtuse angle at the joint of the upper structure and the lower structure; and a VR playing component on a side of the convex lens away from the user and configured to display VR content. ### Claim 12 (depends on 11) The apparatus of claim 11, wherein the VR playing component is a mobile phone or a tablet, and the VR content is displayed through a screen of the VR playing component. ### Claim 13 (depends on 11) The apparatus of claim 11, wherein the VR playing component is a display component connected to an external apparatus, which generates the VR content for the VR playing component to display. ### Claim 14 (depends on 13) The apparatus of claim 13, wherein the external apparatus is a personal computer or a game console. ### Claim 15 (depends on 11) The apparatus of claim 11, wherein the partial-reflection partial-transmission wedge has a higher transmittance for visible light than for infrared light. ### Claim 16 (depends on 11) The apparatus of claim 11, the partial-reflection partial-transmission wedge comprises an infrared dichroic mirror. ### Claim 17 (depends on 16) The apparatus of claim 16, wherein the infrared dichroic mirror comprises a TiO2—Ag—TiO2 infrared reflective film or a ZnS—Ag—ZnS infrared reflective film. ### Claim 18 (depends on 11) The apparatus of claim 11, wherein the first camera is located outside a visible area of the convex lens with respect to the user. ### Claim 19 (depends on 11) The apparatus of claim 11, wherein the joint of the upper structure and the lower structure is located in the middle of the partial-reflection partial-transmission wedge. ### Claim 20 (depends on 11) The apparatus of claim 11, further comprising: an adjustment component configured to perform angle adjustment on the first camera, such that a lens of the first camera is kept towards a virtual infrared image of the eye formed by the partial-reflection partial-transmission wedge.