Aiming device using radiated energy

• US 5,929,444 A
• Filed: 01/31/1995
• Issued: 07/27/1999
• Est. Priority Date: 01/31/1995
• Status: Expired due to Fees

• Current Assignee: Hewlett-Packard Company (HP Inc.)
• Original Assignee: Hewlett-Packard Company (HP Inc.)
• Inventors: Leichner, Robert C.
• Primary Examiner(s): Hannaher, Constantine
• Application Number:
  US08/381,261
• Time in Patent Office: 1,638 Days
• Field of Search: 250/341.7, 250/342, 250/340
• US Class Current: 250/341.7
• CPC Class Codes: F41G 3/2661 in which the light beam is sent from the target to the weapon F41G3/2638 takes precedence
• CPC Class Codes: G01S 5/16 using electromagnetic waves other than radio waves

Abstract

An aiming device (or method) which monitors rotational and angular displacement changes with high precision. The detected changes in rotation and/or angular displacement are then used in various operations depending on the implementation. The invention is useful for many different implementations, including a pointing device, a remote control device, and a shooting practice system. Regardless of implementation, the invention utilizes one or more emitters which emit modulated energy signals, and a detector which detects the emitted energy signals. The detected energy signals are processed by a processing unit to determine a point of aim (angular displacement) and a rotation of a detector with respect to the one or more emitters. As a remote control device, the invention enables a user to invoke actions by pointing and rotation of the remote control device. As a shooting practice system, the invention predicts shot placement on a target with high accuracy, while supporting both "live" fire and "dry" fire.

Claims

1. An aiming system comprising:

a plurality of emitters for emitting distinguishable energy signals in a predetermined direction;

an energy detector for receiving at least a portion of the energy signals produced by said emitters as detected energy; and

a processing unit, operatively connected to said energy detector, for determining a point of aim of said detector with respect to at least one of said emitters based on the detected energy and for determining a rotation of said detector or emitters with respect to a reference orientation based on the detected energy, the rotation being about an axis between one of said emitters and a position of a corresponding image of the one of said emitters on said energy detector.

2. A system as recited in claim 1,

wherein said energy detector is disposed apart from said emitters, and

wherein said energy detector is pointed in the vicinity of said emitters.

3. A system as recited in claim 1, wherein the distinguishable energy signals are modulated infrared light signals.

4. A system as recited in claim 1,

wherein the energy signals have a wavelength less than or equal to that of infrared, and

wherein said system further comprises a filter disposed between said emitters and said energy detector for preventing at least a portion of energy not emitted by said emitters from reaching said energy detector.

5. A system as recited in claim 1,

wherein the detected energy includes at least a plurality of sampled energy values for each of said emitters, and

wherein said processing unit determines the rotation of said detector or emitters with respect the reference direction by

using a first group of the sampled energy values associated with a first of said emitters and a second group of the sampled energy values associated with a second of said emitters;

fitting a line or curve to the first group of the sampled energy values;

determining displacements of one or more of the sampled energy values in the second group from corresponding expected positions on the line or curve; and

determining an angle of rotation of said detector or emitters based on the displacements.

6. A system as recited in claim 5,

wherein said fitting produces the curve using a line fit, and

wherein the first group of the sampled energy values occur a small time interval prior to a predetermined event.

7. A system as recited in claim 1,

wherein the distinguishable energy signals are produced by modulating said emitters differently and include a synchronization region and a least one sampling region, the synchronization region includes at least one pulse, and the at least one sampling region includes at least one pulse, the pulses being produced when at least one of said emitter is activated, and

wherein said processing unit causes said detector to sample the modulated energy received at said detector during the sampling region.

8. A system as recited in claim 7, wherein the sampling by said detector includes obtaining a first sample of the modulated energy received by said detector by sampling the modulated energy during the pulse within the sampling region, and obtaining a second sample of the modulated energy received by said detector by sampling the modulated energy during the lack of the pulse within the sampling region.

9. A system as recited in claim 8, wherein the second sample is subtracted from the first sample to remove constant background noise from the first sample.

10. A system as recited in claim 1,

wherein the energy signals have a wavelength less than or equal to that of infrared, and

wherein said energy detector includes an energy sensitive surface for receiving at least a portion of the energy signals for each of said emitters, each of said emitters producing an imaged spot on the energy sensitive surface, and

wherein the point of aim is determined based on the position of the imaged spot on said energy sensitive surface associated with at least one of said emitters.

11. A system as recited in claim 10, wherein the rotation of said energy detector or emitters is determined based on the position on said energy sensitive surface of the imaged spots associated with at least two of said emitters.

12. A system as recited in claim 10, wherein said processing unit comprises:

means for determining a first relative position of an imaged spot associated with one of said emitters on said energy sensitive surface; and

means for transforming the first relative position to a second relative position, the second relative position indicating relative angular position of said energy detector with respect to the one of said emitters.

13. A system as recited in claim 1, wherein said system further comprises means for informing a user that the point of aim of said detector with respect to at least one of said emitters has been noticed.