Head mounted flight training apparatus

• US 4,106,217 A
• Filed: 02/15/1977
• Issued: 08/15/1978
• Est. Priority Date: 02/20/1976
• Status: Expired due to Term

• Current Assignee: Instrument Flight Research Incorporated
• Original Assignee: Frank A. Witt
• Inventors: Witt, Frank A.
• Primary Examiner(s): Pinkham, Richard C.
• Assistant Examiner(s): Hum, Vance Y.
• Application Number:
  US05/768,941
• Time in Patent Office: 546 Days
• Field of Search: 35/12 B, 35/12 G, 35/12 N, 2/2, 2/6, 2/8, 2/12, 2/432, 340/228 S, 40/52 R, 40/130 L, 350/160 LC, 273/183 B
• US Class Current: 434/36
• CPC Class Codes: G02C 7/101 having an electro-optical light valve electro-optical elements per se G02F
• CPC Class Codes: G02C 7/16 Shades; shields; Obturators, e.g. with pinhole, with slot G02C5/003 takes precedence
• CPC Class Codes: G02F 1/13306 Circuit arrangements or driving methods for the control of single liquid crystal cells G02F1/132, G02F1/133382 take precedence
• CPC Class Codes: G02F 1/13318 Circuits comprising a photodetector
• CPC Class Codes: G09B 9/165 Condition of cabin, cockpit or pilot's accessories

Abstract

Instrument flight training glasses including a voltage controlled, liquid crystal lens system having upper and lower contiguous lens systems independently operable with respect to each other, for limiting a pilot'"'"'s vision to the instrument control panel of his aircraft when so desired. The lens systems are opacity variable for simulating flight through particular weather and cloud conditions while providing instant clearing of the lower lens system as the pilot views the aircraft control panel. During a landing approach an interlock system is manually actuable to prevent opaque obscuring of the lens system.

Claims

1. Flight training apparatus operable for preventing a pilot from viewing out through the windshield of his aircraft, comprising:

voltage controlled lens means having a first state of transparency permitting visual communication therethrough, and operable to a second state of opacity for blocking visual communication;

means for suitably securing said lens means in a transverse relationship with respect to lines of sight of a pilot;

vision checking means actuable responsive to an electrical signal for checking the pilot'"'"'s vision through said lens means with respect to a peripheral-view-direction to a predetermined line of sight to engage movement of the pilot'"'"'s head for a greater peripheral viewing along said peripheral-view-direction;

means selectably actuable for producing said electrical signal for actuating said vision checking means;

means for monitoring the relative position of said predetermined line of sight with respect to the windshield, said means indicating when said predetermined line of sight passes through the windshield; and

electrical circuitry means cooperable with said monitoring means for actuating said lens means to said second state responsive to said monitoring means indicating said predetermined line of sight is passing through said windshield, said lens means otherwise remaining in said first state.

2. Apparatus according to claim 1 wherein said actuable vision checking means includes a voltage controlled second lens means having a first state of transparency permitting visual communication therethrough, and operable to a second state of opacity for blocking visual communication for checking the pilot'"'"'s vision to said peripheral-view-direction.

3. Apparatus according to claim 2 and further including side blinder means for blocking side peripheral vision of the pilot, said side blinder means including a voltage controlled third lens means having a first state of transparency permitting visual communication therethrough, and operable to a second state of opacity for blocking side peripheral vision.

4. Apparatus according to claim 2 and further including manual switching means operable for maintaining said lens means and said second lens means in said transparent state despite said monitoring means indicating said predetermine line of sight passing through the windshield;

and interlock means operable for preventing disoperation of said switching means.

6. Apparatus according to claim 2 and further including means for gradually decreasing opacity of said second lens means over a prefixed time for switching between said second state and said first state for simulating flight through cloud structures, said gradual decreasing opacity means cooperating with said electrical circuitry means for gradually decreasing opacity of said lens means responsive to said monitoring means indicating said predetermined line of sight passing through said windshield, said gradual decreasing opacity means affecting said second lens means in opacity correspondence with said lens means.

7. Apparatus according to claim 1 and further including means for nonuniformly, continually actuating said checking means for continually checking the pilot'"'"'s vision through said lens means for simulating flight through cloud structures, said nonuniform continual actuating means cooperating with said electrical circuitry means for continually actuating said lens means to said second state responsive to said monitoring means indicating said predetermine line of sight passing through said windshield, said nonuniform continual actuating means actuating said lens means in synchronism with said checking means.

5. Apparatus according to calim 2 and further including means for gradually increasing opacity of said second lens means over a prefixed time for switching between said first state and said second state for simulating flight through cloud structures, said gradual increasing opacity means cooperating with said electrical circuitry means for gradually increasing opacity of said lens means responsive to said monitoring means indicating said predetermined line of sight passing through said windshield, said gradual increasing opacity means affecting said second lens means in opacity correspondence with said lens means.

8. Flight training apparatus operable for preventing a pilot from viewing out through the windshield of his aircraft, comprising:

voltage controlled first lens means having a first state of transparency permitting visual communication therethrough, and operable to a second state of opacity for blocking visual communication;

voltage controlled second lens means having a first state of transparency permitting visual communication therethrough, and operable to a second state of opacity for blocking visual communication, said first and second lens means disposed contiguous to each other;

means for suitably securing said first and second lens means in a transverse relationship with respect to lines of sight of a pilot, said first lens means disposed with respect to a peripheral-view-direction of the pilot;

means for selectably actuating said first lens means to said second state for checking the pilot'"'"'s vision through said second lens means to a predetermined line of sight defined by the contiguous relationship of said first and second lens means to engage movement of the pilot'"'"'s head for a greater peripheral viewing along said peripheral-view direction;

means for monitoring the relative position of the predetermined line of sight with respect to the windshield, said means indicating when said predetermined line of sight passes through the windshield; and

electrical circuitry means cooperable with said monitoring means for actuating said second lens means to said second state responsive to said monitoring means indicating said predetermined line of sight passing through said windshield, said second lens means otherwise remaining in said first state.

9. Apparatus according to claim 8 and further including side blinder means for blocking side peripheral vision of the pilot, said side blinder means including a voltage controlled third lens means having a first state of transparency permitting visual communication therethrough, and operable to a second state of opacity for blocking side peripheral vision.

10. Apparatus according to claim 9 wherein said selectably actuating means actuates said third lens means to said opaque state conjointly with actuation of said first lens means to said opaque state.

11. Apparatus according to claim 8 and further including means operable for nonuniformly, continually actuating said first lens means to said second state for continually checking the pilot'"'"'s vision through said second lens means for simulating flight through cloud structures, said continual actuating means cooperating with said electrical circuitry means for nonuniformly, continually actuating said second lens means to said second state responsive to said monitoring means indicating said predetermined line of sight passing through said windshield, said nonuniform continual actuating means actuating said second lens means in synchronism with said first means.

12. Flight training apparatus operable for affecting a pilot'"'"'s vision out through the windshield of his aricraft, comprising:

voltage controlled lens means having a first state of transparency permitting visual communication therethrough and operable to a second state of percentage opacity for affecting visual communication, said second state of percentage opacity for simulating distance of visibility to the pilot;

means for suitably securing said lens means in a transverse relationship with respect to lines of sight of a pilot;

vision checking means for checking the pilot'"'"'s vision through said lens means with respect to a peripheral-view-direction to a predetermined line of sight to engage movement of the pilot'"'"'s head for a greater peripheral viewing along said peripheral-view-direction;

means for monitoring the relative position of said predetermined line of sight with respect to the windshield, said means indicating when said predetermined line of sight passes through said windshield; and

electrical circuitry means cooperable with said monitoring means for actuating said lens means to said second state responsive to said monitoring means indicating said predetermined line of sight is passing through said windshield, said lens means otherwise remaining in said first state, whereby a flight training apparatus is provided operable to affect the pilot'"'"'s visual communication when the pilot views outside the craft to simulate distance of visibility, and operable to unobstructed clear visual communication as the pilot turns to view the instrument control panel of his craft.

13. Apparatus according to claim 12 wherein said vision checking means includes a voltage controlled second lens means having a state of percentage opacity equal to the percentage opacity of said second state.

14. Apparatus according to claim 12 and further including means for varying the percentage opacity of said second state.

15. Flight training apparatus operable for affecting a pilot'"'"'s vision through the windshield of his aircraft, comprising:

voltage controlled lens means having a first state of transparency permitting visual communication therethrough, and operable to a second state of opacity for blocking visual communication;

means for suitably securing said lens means in a transverse relationship with respect to lines of sight of a pilot;

vision checking means for checking the pilot'"'"'s vision through said lens means with respect to a peripheral-view direction to a predetermined line of sight to engage movement of the pilot'"'"'s head for a greater peripheral viewing along said peripheral-view direction;

means for monitoring the relative position of said predetermined line of sight with respect to the windshield, said means indicating when said predetermined line of sight passes through said windshield;

electrical circuitry means cooperable with said monitoring means for actuating said lens means to said said second state responsive to said monitoring means indicating said predetermined line of sight is passing through said windshield, said leans means otherwise remaining in said first state; and

means cooperating with said electrical circuitry means, for nonuniformly, continually actuating said lens means to said second state responsive to said monitoring means indicating said predetermined line of sight is passing through said windshield, whereby a flight training apparatus is provided operable to affect the pilot'"'"'s visual communication when the pilot views outside the craft to simulate flight through cloud structures and operable to unobstructed clear visual communication as the pilot turns to view the instrument panel of his craft.