Offset cardan gimbal

• US 20020063197A1
• Filed: 04/18/2001
• Published: 05/30/2002
• Est. Priority Date: 04/19/2000
• Status: Active Grant

• Current Assignee: Sonoma Design Group (L3Harris Technologies, Inc.)
• Original Assignee: Allan Alfred Voigt, Che Ram Souza Voigt, John Speicher
• Inventors: Voigt, Allan Alfred, Voigt, Che Ram Souza, Speicher, John
• Granted Patent: US 6,454,229 B1
• Time in Patent Office: Days
• US Class Current: 248/660
• CPC Class Codes: G01C 21/18 Stabilised platforms, e.g. by gyroscope

Abstract

An apparatus for the control and alignment of a sensor on a moving vehicle is provided that includes a gimbal ball supported by an outer axis structure and adapted to pivot about an outer elevation axis and about an outer azimuth axis. The outer axis structure is mounted to a vehicle. A cardan assembly is provided in the ball that includes a cardan shaft with an inner elevation axis passing through the cardan shaft. The inner elevation axis is in parallel alignment with respect to the outer elevation axis and includes an offset that raises the inner elevation axis above the outer elevation axis by a predetermined amount to provide for a greater payload volume and improved optical performance. If desired the cardan assembly includes an inner azimuth axis that is offset with respect to the outer azimuth axis.

Claims

1. An offset cardan gimbal, comprising:

(a) a gimbal ball;

(b) an outer axis structure adapted to support said gimbal ball and including means for providing for the motion of said ball about an external elevation axis and about an external azimuth axis; and

(c) a cardan assembly disposed in said ball, said cardan assembly including a cardan shaft, said cardan shaft adapted to pivot about an inner elevation axis, said inner elevation axis disposed in substantially parallel longitudinal alignment with respect to said external elevation axis and including an offset with respect to said external elevation axis.

2. The offset cardan gimbal of claim 1 wherein said offset includes a magnitude that is at least five percent of the diameter of said ball.

3. The offset cardan gimbal of claim 1 wherein said offset includes a magnitude that is at least ten percent of the diameter of said ball.

4. The offset cardan gimbal of claim 1 wherein said offset includes a magnitude that is at least fifteen percent of the diameter of said ball.

5. The offset cardan gimbal of claim 1 wherein said offset includes a magnitude that is at least twenty percent of the diameter of said ball.

6. The offset cardan gimbal of claim 1 wherein said cardan assembly is adapted to support a payload.

7. The offset cardan gimbal of claim 6 wherein said cardan assembly includes an inner azimuth axis said inner azimuth axis being disposed in perpendicular longitudinal alignment with respect to said inner elevation axis and wherein said payload is adapted to pivot about said inner azimuth axis, said inner azimuth axis disposed in parallel longitudinal alignment with respect to said external azimuth axis and including an offset with respect to said external azimuth axis.

8. The offset cardan gimbal of claim 6 wherein said cardan assembly includes an inner roll axis that includes offset with respect to a normal axis.

9. A method for increasing the payload size of a gimbal which comprises:

(a) providing a gimbal ball;

(b) providing an outer axis structure adapted to support said gimbal ball and including means for providing for the motion of said ball about an external elevation axis and about an external azimuth axis; and

(c) providing a cardan assembly disposed in said ball, wherein said cardan assembly including a cardan shaft, and wherein said cardan shaft is adapted to pivot about an inner elevation axis, and wherein said inner elevation axis is disposed in parallel longitudinal alignment with respect to said external elevation axis and wherein said inner elevation axis includes an offset with respect to said external elevation axis.

10. The method of claim 9 wherein the step of providing a cardan assembly includes the step of providing an offset for said inner elevation axis of said cardan assembly with respect to said outer elevation axis of the gimbal support structure that is at least five percent of the magnitude of the diameter of said gimbal ball.

11. The method of claim 9 wherein the step of providing a cardan assembly includes the step of providing an offset for said inner elevation axis of said cardan assembly with respect to said outer elevation axis of the gimbal support structure that is at least ten percent of the magnitude of the diameter of said gimbal ball.

12. The method of claim 9 wherein the step of providing a cardan assembly includes the step of providing an offset for said inner elevation axis of said cardan assembly with respect to said outer elevation axis of the gimbal support structure that is at least fifteen percent of the magnitude of the diameter of said gimbal ball.

13. The method of claim 9 wherein the step of providing a cardan assembly includes the step of providing an offset for said inner elevation axis of said cardan assembly with respect to said outer elevation axis of the gimbal support structure that is at least twenty percent of the magnitude of the diameter of said gimbal ball.

14. The method of claim 9 including the additional step of providing an offset for an inner azimuth axis of the cardan assembly with respect to said outer azimuth axis.

15. The method of claim 9 including the additional step of providing an offset for an inner roll axis of the cardan assembly.