Optical system image stabilizer employing electromechanical torque sensors

• US 4,774,589 A
• Filed: 03/03/1986
• Issued: 09/27/1988
• Est. Priority Date: 03/03/1986
• Status: Expired due to Term

• Current Assignee: David A. Rowland
• Original Assignee: David A. Rowland
• Inventors: Rowland, David A.
• Primary Examiner(s): Ng, Jin F.
• Assistant Examiner(s): BRINICH, STEPHEN M
• Application Number:
  US06/835,461
• Time in Patent Office: 939 Days
• Field of Search: 358/222, 358/229, 358/108, 358/225
• US Class Current: 348/208.7
• CPC Class Codes: H04N 23/68 for stable pick-up of the scene, e.g. compensating for camera body vibrations
• CPC Class Codes: H04N 23/6812 based on additional sensors, e.g. acceleration sensors
• CPC Class Codes: H04N 23/687 by shifting the lens or sensor position

Abstract

An image stabilizer for optical systems is disclosed as are its use with optical systems and its combination with such systems. The stabilizer measures the torque applied to the visual system about an axis and applies a reactive countertorque. More than one such device can be employed to stabilize along more than one axis.

Claims

1. A stabilizing mechanism for an optical system comprising an electromechanical torque sensor affixable to the optical system to detect vibration of the optical system about an axis and generate an electrical signal related to the detected vibration,

an electric motor affixable to the optical system and capable of rotating a free flywheel mass about said axis, and

a controller which measures the electrical signal from the electromechanical torque sensor and directs the motor to rotate the free flywheel mass so as to counteract the vibration detected by the electromechanical torque sensor.

2. The stabilizing mechanism in accordance with claim 1 further comprising a frame to which the electromechanical torque sensor and the electric motor are attached.

3. The stabilizing mechanism in accordance with claim 2 wherein the frame is affixable to the optical system.

4. The stabilizing mechanism in accordance with claim 1, further comprising a plurality of electromechanical torque sensors, motors and controllers so as to counteract vibration about a plurality of axes.

5. The stabilizing mechanism in accordance with claim 1, further comprising means for filtering the signal generated by the electromechanical torque sensor.

6. The stabilizing mechanism in accordance with claim 3, wherein the farme additionally comprises a handle for the operator of the optical system.

7. A stabilized optical system comprising an optical system in combination with a stabilizing mechanism, which mechanism comprises an electromechanical torque sensor affixed to the optical system to detect vibration of the optical system about an axis and generate an electrical signal related to the detected vibration,

an electric motor affixed to the optical system and capable of rotating a free flywheel mass about said axis, and

a controller which measures the electrical signal from the sensor and directs the motor to rotate the mass so as to counteract the vibration detected by the electromechanical torque sensor.

8. The stabilized optical system in accordance with claim 7 further comprising a frame to which the optical system, the electromechanical torque sensor, and the electric motor are attached.

9. The stabilized optical system in accordance with claim 7, further comprising a plurality of electromechanical torque sensors, motors, and controllers so as to counteract vibration about a plurality of axes.

10. The stabilized optical system in accordance with claim 7, further comprising means for filtering the signal generated by electromechanical torque sensor.

11. The stabilized optical system in accordance with claim 8, wherein the frame additionally comprises a handle for the operator of the optical system.

12. A stabilized optical system in accordance with claim 7, wherein the optical system is the lens and image tube of a video camera and the optical system and stabilizing mechanism are rotatably mounted within the body of the camera.

13. A stabilized optical system in accordance with claim 7, wherein the optical system is the lens and film holder of a film camera and the optical system and stabilizing mechanism are rotatably mounted within the body of the camera.

14. A method of stabilizing an optical system against vibration about an axis comprising the steps of

a. detecting with an electromechanical torque detector vibration of the optical system about the axis and generating an electrical signal related to the detected vibration,

b. measuring the electrical signal, and

c. directing an electric motor affixed to the optical system with its shaft parallel to the axis to rotate a free flywheel mass so as to counteract the vibration detected by the sensor.

15. A stabilizing mechanism for an optical system comprising a meter movement electromechanical torque sensor affixable through a frame to the optical system to detect vibration of the optical system about an axis and generate an electrical signal related to the detected vibration,

an electric motor affixable to the optical system through said frame and capable of rotating a free flywheel mass about said axis, and

a controller which measures the electrical signal from the electromechanical torque sensor and directs the motor to rotate the free flywheel mass so as to counteract the vibration detected by the electromechanical torque sensor.