Flight training hood

• US 4,021,935 A
• Filed: 02/20/1976
• Issued: 05/10/1977
• Est. Priority Date: 02/20/1976
• Status: Expired due to Term

• Current Assignee: Instrument Flight Research Incorporated
• Original Assignee: Frank Witt
• Inventors: Witt, Frank
• Primary Examiner(s): Pinkham, Richard C.
• Assistant Examiner(s): Hum, Vance Y.
• Application Number:
  US05/659,906
• Time in Patent Office: 445 Days
• Field of Search: 35/12 R, 35/12 B, 35/12 N, 35/12 G, 2/2, 2/6, 2/8, 2/12, 340/228 S, 40/52 R, 40/130 L, 350/160 LC, 315/134
• 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

An instrument flight training hood including a voltage-controlled, liquid crystal viewing lens operable to a first state of transparency when a wearer is viewing the instrument control panel of his aircraft and operable to a second state of opacity to instantaneously occlude viewing when wearer changes his line of vision outside of the aircraft. A uniform passageway recessed within the hood directionally communicates light received from an area of space substantially along the wearer'"'"'s line of sight, to a photocell for lens state actuation responsive to a manually preset light intensity threshold. A manual switching arrangement permits maintenance of lens transparency to provide vertigo simulation capabilities upon flight landing approach whereby wearer changing his line of sight outside of the aircraft to occlude his viewing, and thereafter manually switching the lens to its transparent state enters a condition of vertigo.

Claims

1. A flight training hood for limiting the vision of a pilot to the instrument control panel of his aircraft, comprising:

hood means;

bistable, voltage controlled, lens means suitably secured to said hood means in a transverse relationship with respect to the line of sight of a wearer thereof, said lens means having a first state of transparency permitting the wearer to visually communicate therethrough, and operable to a second state of opacity for affecting visual communication;

light receiving transducer means operatively associated with the movement of said hood means for monitoring light from a predetermined area of space with respect to said hood means;

means for channeling light to said light receiving means, for restricting the reception of light by said light receiving means to directional light reception and for receiving directional light from an area of space lying substantially along a predetermined line of sight of the wearer;

electrical circuitry means cooperable with said light receiving means for voltage controlling said lens means, said circuitry means including means for providing a reference level corresponding to substantially the light intensity coming from the control panel of the aircraft and said circuitry means actuating said lens means to said second state responsive to a light intensity monitored by said light receiving means greater than said light intensity corresponded by said reference level, said lens means remaining in said first state with monitored light intensities below or equal to said light intensity corresponded by said reference level.

2. A flight training hood according to claim 1 and further including vision checking means for checking the wearer'"'"'s peripheral vision in the area of said predetermined line of sight to substantially said predetermined line of sight to engage movement of said hood means for a greater peripheral viewing by the wearer.

3. A device according to claim 2 wherein said vision checking means includes a bill section projecting outwardly from above said lens means.

4. A device according to claim 1 and further including manual switching means for maintaining said lens means in said transparent state despite the level of intensity monitored by said light receiving means.

5. A flight training hood for limiting the vision of a pilot to the instrument control panel of his aircraft, comprising:

hood means;

bistable, voltage controlled, lens means suitably secured to said hood means in a transverse relationship with respect to the line of sight of a wearer thereof, said lens means having a first state of transparency permitting the wearer to visually communicate therethrough, and operable to a second state of opacity for affecting visual communication;

directional light receiving means operatively associated with the movement of said hood means, for monitoring directional light coming from a predetermined area of space with respect to said hood means, said predetermined area of space lying substantially along a predetermined line of sight of the wearer;

electrical circuitry means cooperable with said light receiving means for voltage controlling said lens means, said circuitry means including means for providing a reference level corresponding to substantially the light intensity coming from the control panel of the aircraft and said circuitry means actuating said lens means to said second state responsive to a light intensity monitored by said light receiving means greater than said light intensity corresponded by said reference level, said lens means remaining in said first state with monitored light intensities below or equal to said light intensity corresponded by said reference level; and

vision checking means for checking the wearer'"'"'s peripheral vision in the area of said predetermined line of sight to substantially said predetermined line of sight peripheral viewing by the wearer.

6. A device according to claim 5 wherein said vision checking means includes a bill section projecting outwardly from above said lens means.

7. A device according to claim 6 wherein said bill section projects transversely with respect to said predetermined line of sight.

8. A device according to claim 5 wherein said vision checking means is formed by a low positioning of said lens means with respect to the wearer'"'"'s line of sight, for causing the wearer'"'"'s area of vision to be less above than that below a level eyeball line of sight.

9. A device according to claim 5 wherein said reference level is manually settable.

10. A device according to claim 5 wherein said lens means includes a liquid crystal lens.

11. A device according to claim 5 wherein said directional light receiving means includes:

light receiving transducer means; and

means for channeling light to said light receiving transducer means for restricting the reception of light by said light receiving means to directional light reception.

12. A flight training hood for limiting the vision of a pilot to the instrument control panel of his aircraft, comprising:

hood means;

bistable, voltage controlled, lens means suitably secured to said hood means in a transverse relationship with respect to the line of sight of a wearer thereof, said lens means having a first state of transparency permitting the wearer to visually communicate therethrough, and operable to a second state of opacity for affecting visual communication;

directional light receiving means operatively associated with the movement of said hood means, for monitoring directional light coming from a predetermined area of space with respect to said hood means, said predetermined area of space lying substantially along a predetermined line of sight of the wearer;

electrical circuitry means cooperable with said light receiving means for voltage controlling said lens means, said circuitry means including means for providing a reference level corresponding to substantially the light intensity coming from the control panel of the aircraft and said circuitry means actuating said lens means to said second state responsive to a light intensity monitored by said light receiving means greater than said light intensity corresponded by said reference level, said lens means remaining in said first state with monitored light intensities below or equal to said light intensity corresponded by said reference level; and

manual switching means for maintaining said lens means in said transparent state despite the level of intensity monitored by said light receiving means.

13. A device according to claim 12 wherein said switching means is disposed on the outside of said hood means for manual switching by the wearer thereof.

14. A flight training hood for limiting the vision of a pilot to the instrument control panel of his aircraft, comprising:

hood means;

bistable, voltage controlled, liquid crystal lens means suitably secured to said hood means in a transverse relationship with respect to the line of sight of a wearer thereof, said lens means having a first state of transparency permitting the wearer to visually communicate therethrough, and operable to a second state of opacity for affecting visual communication, said lens means further including;

a light emitting diode positioned to the wearer'"'"'s side of said lens means for reflection thereon providing opaqueness when said lens is in said second state; and

a light shield positioned to obstruct direct light from said light emitting diode passing to the eyes of the wearer;

directional light receiving means operatively associated with the movement of said hood means, for monitoring directional light coming from a predetermined area of space with respect to said hood means, said predetermined area of space lying substantially along a predetermined line of sight of the wearer; and

electrical circuitry means cooperable with said light receiving means for voltage controlling said lens means, said circuitry means including means for providing a reference level corresponding to substantially the light intensity coming from the control panel of the aircraft and said circuitry means actuating said lens means to said second state responsive to a light intensity monitored by said light receiving means greater than said light intensity corresponded by said reference level, said lens means remaining in said first state with monitored light intensities below or equal to said light intensity corresponded by said reference level.