Hang gliding simulation system with a stereoscopic display

• US 5,908,300 A
• Filed: 12/13/1996
• Issued: 06/01/1999
• Est. Priority Date: 07/28/1994
• Status: Expired due to Fees

• Current Assignee: Evans & Sutherland Computer Corp. (Elevate Entertainment, Inc.)
• Original Assignee: Evans & Sutherland Computer Corp. (Elevate Entertainment, Inc.)
• Inventors: Cox, Clifford N., Linton, Richard B., Lyon, Paul C., Nye, Rulon, Fisher, Ralph W., Edwards, Jeffrey B., Walker, Joe L.
• Primary Examiner(s): Cheng, Joe H.
• Application Number:
  US08/763,717
• Time in Patent Office: 900 Days
• Field of Search: 434/30, 434/38, 434/43, 434/44, 434/69, 434/307 R, 434/308, 434/365, 345/7, 345/8, 348/50, 348/51, 348/53, 348/42, 348/115, 348/117, 382/154, 359/13-15, 359/618, 359/630, 359/635, 359/839, 340/980, 353/28, 352/63, 356/139.03
• US Class Current: 434/43
• CPC Class Codes: G02B 2027/0134 of stereoscopic type
• CPC Class Codes: G02B 27/017 Head mounted
• CPC Class Codes: G02B 27/0172 characterised by optical features
• CPC Class Codes: G09B 9/085 Special purpose teaching, e.g. alighting on water, aerial photography
• CPC Class Codes: G09B 9/34 by cathode-ray screen display G09B9/307, G09B9/36 take precedence
• CPC Class Codes: H04N 13/117 the virtual viewpoint locations being selected by the viewers or determined by viewer tracking
• CPC Class Codes: H04N 13/167 Synchronising or controlling image signals
• CPC Class Codes: H04N 13/279 the virtual viewpoint locations being selected by the viewers or determined by tracking
• CPC Class Codes: H04N 13/289 Switching between monoscopic and stereoscopic modes
• CPC Class Codes: H04N 13/296 Synchronisation thereof; Control thereof
• CPC Class Codes: H04N 13/344 with head-mounted left-right displays
• CPC Class Codes: H04N 13/398 Synchronisation thereof; Control thereof

Abstract

The present invention is directed to a simulation system for simulating virtual reality experiences such as for the sport of hang gliding or the like. The simulation system has a stereoscopic and collimated virtual image display, for providing pupil forming simulated images to a rider at a fixed point of reference relative to the stereoscopic display. In the disclosed embodiment, the simulation system comprises a mechanical support structure for suspending the rider in a harness so as to allow freedom of movement. The rider is suspended to face a visual display over a movable control bar coupled to the mechanical support structure. By maneuvering the control bar, riders may view the results of their actions as by a simulated display. The visual display is coupled to the control bar to receive electrical signals indicative of the movements initiated by the riders as they maneuver through a programmed environment. The visual display provides stereoscopic "pupil forming" images of positional states of the hang glider to the riders at a fixed point of reference relative to the visual display. The fixed point of reference is provided by limiting movement of the rider'"'"'s head relative to the visual display, as for example with a head rest disposed directly above the viewing area of the visual display.

Claims

1. A stereoscopic display system for providing pupil forming simulated images of positional states controlled by a user of a simulation system with a programmed environment, comprising:

at least two cathode ray tubes (CRTs) for providing left and right eye pupil forming images of simulated movement in said programmed environment;

at least two lenses arranged relative to said CRTs to focus the left and right eye pupil forming images;

a spherical mirror for reflecting said left and right eye pupil forming images to left and right eyes, respectively, of the user;

a viewing aperture through which to view the spherical mirror, wherein the viewing aperture is a fixed point of reference with respect to the spherical mirror for viewing the left and the right pupil forming images; and

a beamsplitter arranged relative to said lenses to superimpose said left and right eye pupil forming images and to transmit said pupil forming images to said spherical mirror for subsequent reflection to said left and right eyes of the user.

2. A stereoscopic display system according to claim 1, wherein said programmed environment is provided by an interactive computer with flight simulation software.

3. A stereoscopic display system as defined in claim 1 wherein the fixed point of reference for the users'"'"'eyes is a head rest disposed directly above the viewing aperture of the spherical mirror such that the user'"'"'s head movement is not required to cause movement of the simulated images.

4. A stereoscopic display system with a head rest as defined in claim 3 wherein the headrest is substantially concave to thereby conform to the user'"'"'s head, and is substantially fixed with respect to the spherical mirror.

5. A stereoscopic display system as described in claim 1 further comprising:

a mechanical support structure disposed in front of the viewing aperture and spherical mirror;

a harness in which the user is suspended from the support structure to allow freedom of movement;

a movable control bar with yaw, pitch and roll, movably coupled to the mechanical support structure, and disposed such that the user can move the movable control bar when disposed in the harness;

a control transducer which is mechanically coupled to the movable control bar whereby the control transducer transmits electrical signals to the display system which are representative of movement of the movable control bar, thereby causing movement of the simulated images.

6. A method according to claim 5, wherein said programmed environment is provided by an interactive computer with flight simulation software.

7. A method for providing pupil forming simulated images of positional states controlled by a user of a simulation system with a programmed environment, comprising:

utilizing at least two cathode ray tubes (CRTs) for providing left and right eye pupil forming images of simulated movement in said programmed environment;

arranging at least two lenses arranged relative to said CRTs to focus the left and right eye pupil forming images;

reflecting said left and right eye pupil forming images through a spherical mirror to left and right eyes, respectively, of the user;

disposing a beamsplitter relative to said lenses to thereby superimpose said left and right eye pupil forming images and to transmit said pupil forming images to said spherical mirror for reflection to said left and right eyes of the user; and

providing a fixed point of reference for the user with respect to the spherical mirror such that movement of the simulated images as seen by the user in the left and right eye pupil forming images does not require movement of the user'"'"'s head.

8. A method according to claim 7, wherein said programmed environment is provided by an interactive computer with flight simulation software.

9. A stereoscopic display system for providing pupil forming simulated images of positional states controlled by a user of a simulation system in a programmed environment, comprising:

a first cathode ray tube (CRT) for providing a right eye pupil forming image of simulated movement in said programmed environment;

a second CRT for providing a left eye pupil forming image of simulated movement in said programmed environment;

a first lens which is located above a viewing plane defined by eyes of the user and a pair of pupil images, said first lens transmitting beams from the first CRT to a beamsplitter;

a second lens which is located below the viewing plane, said second lens transmitting beams from a second CRT to the beamsplitter;

the beamsplitter arranged relative to said first and second lenses to thereby superimpose and transmit said left and right eye pupil forming images; and

the spherical mirror for receiving and reflecting said left and right eye pupil forming images from the beamsplitter to a left eye and a right eye, respectively, of the user.

10. A stereoscopic display system as defined in claim 9 wherein said system further comprises:

the first lens having a first optical axis which is offset from the first CRT by approximately 81 degrees; and

the second lens having a second optical axis which is offset from the second CRT by approximately 81 degrees.

11. A stereoscopic display system as defined in claim 10 wherein said system further comprises:

the first optical axis being offset above a beamsplitter plane by an angle of approximately 50 degrees; and

the second optical axis being offset below the beamsplitter plane by an angle of approximately 50 degrees.

12. A stereoscopic display system as defined in claim 11 wherein said system further comprises:

the first optical axis being offset from a center axis of the spherical mirror by an angle of approximately 9 degrees along a device plane which passes through the center axis, and which is perpendicular to the viewing plane, and wherein the beams will pass through the beamsplitter and reflect off the spherical mirror into the user'"'"'s right eye; and

the viewing plane being offset from the center axis by an angle of approximately 9 degrees.

13. A stereoscopic display system as defined in claim 11 wherein said system further comprises:

the first lens being disposed above the device plane such that the optical axis of the first lens is directed towards the beamsplitter at an angle of approximately 4 degrees; and

the second lens being disposed below the device plane such that the optical axis of the second lens is directed towards the beamsplitter at an angle of approximately 4 degrees.

14. The stereoscopic display system of claim 10 wherein the first and second lenses are each further comprised of at least two lenses each.

15. A method according to claim 9, wherein said programmed environment is provided by an interactive computer with flight simulation software.