Dual polarizing hood

• US 8,588,605 B2
• Filed: 09/27/2011
• Issued: 11/19/2013
• Est. Priority Date: 09/21/2011
• Status: Active Grant

• Current Assignee: GlobalMedia Group LLC
• Original Assignee: GlobalMedia Group LLC
• Inventors: Harris, Michael D.
• Primary Examiner(s): LaBalle, Clayton E
• Assistant Examiner(s): Hancock, Dennis
• Application Number:
  US13/246,590
• Publication Number:
  US 20130071103A1
• Time in Patent Office: 784 Days
• Field of Search: 359/487.05, 359/487.01
• US Class Current: 396/544
• CPC Class Codes: G02B 27/28 for polarising used in stereoscopes G02B30/25
• CPC Class Codes: G02B 27/281 used for attenuating light intensity, e.g. comprising rotatable polarising elements
• CPC Class Codes: G02B 7/00 Mountings, adjusting means, or light-tight connections, for optical elements
• CPC Class Codes: G03B 11/00 Filters or other obturators specially adapted for photographic purposes
• CPC Class Codes: G03B 11/045 Lens hoods or shields
• CPC Class Codes: G03B 15/05 Combinations of cameras with electronic flash apparatus; Electronic flash units
• CPC Class Codes: G03B 17/565 Optical accessories, e.g. converters for close-up photography, tele-convertors, wide-angle convertors
• CPC Class Codes: G03B 2215/0567 Solid-state light source, e.g. LED, laser
• CPC Class Codes: G03B 2215/0575 Ring shaped lighting arrangements

Abstract

A polarizing hood including a first polarized filter with the center of the filter removed. Placed forward and in front of the first polarized filter is a second linear polarized filter substantially the size of the hole in the first polarized filter and is held in place by a clear lens. The polarization may be adjusted. In response to light collocated with an objective lens shined through the first polarizing filter, the light become polarized. The reflected polarized light returns through the second polarized filter, and full polarization is accomplished with respect to the viewing camera.

Claims

1. A polarizing device for polarizing light captured by a lens comprising

a conduit having a first open end and a second open end;

wherein the first open end is coupled to a light source, wherein the first open end is configured to be coupled to the lens;

a first polarizing filter positioned within the conduit for receiving light from the light source; and

a second polarizing filter positioned within the conduit for receiving reflected light from the light source, the reflected light received through the second open end, wherein a derm hood is removably coupled to the conduit and configured to protect a distal end of the tube from contact with foreign bodies.

2. The device of claim 1, wherein the first polarizing filter is configured to allow reflected light from the light source to pass through a portion of the first polarizing filter without being filtered.

3. The device of claim 1, wherein the first polarizing filter comprises a polarizing portion and a non-polarizing portion.

4. The device of claim 3, wherein the polarizing portion is located along the perimeter of the first polarizing filter and a non-polarizing portion is located in the center of the first polarizing filter.

5. The device of claim 1, wherein the second polarizing filter comprises a polarizing portion and a non-polarizing portion.

6. The device of claim 5, wherein the polarizing portion is located in the center of the second polarizing filter and the non-polarizing portion is located along the perimeter of the first polarizing filter.

7. The device of claim 1, wherein the first polarizing filter and the second polarizing filter are linear polarizing filters.

8. The device of claim 1, wherein the light source is collocated with the lens.

9. The device of claim 1, wherein the second polarizing filter is rotatably adjustable relative to the first polarizing filter to alter the polarity of the received reflected light.

10. The device of claim 1, wherein the lens is at least one of a digital still camera lens and a digital video camera lens.

11. The device of claim 10, wherein the polarizing device is configured to be conveniently uncoupled from the camera when its use is not desired.

12. The device of claim 1, wherein the conduit is axially aligned with the lens and is positioned so as not to illuminate the lens other than via light reflected off a target and up through the lens.

13. A hooded polarizing tube configured to be coupled to a camera having an embedded light at least partially surrounding a camera lens comprising:

an opening to securably couple the tube to the camera;

a first polarizing filter positioned in the tube fitted over the embedded light;

wherein a polarizing region of the first polarizing filter does not overlap reflected light captured by the camera lens; and

a smaller second polarizing filter positioned in the tube configured to filter the reflected light coming back to the lens, wherein the first polarizing filter is located between the second polarizing filter and the camera lens, wherein a derm hood is removably coupled to the conduit to protect a distal end of the tube from contact with foreign bodies.

14. The hooded polarizing tube of claim 13, wherein the first polarizing filter and the second polarizing filter are linear polarizing filters.

15. The hooded polarizing tube of claim 13, wherein the second polarizing filter is rotatably adjustable relative to the first polarizing filter to alter the polarity of the received reflected light.

16. The hooded polarizing tube of claim 13, wherein the hooded polarizing tube is configured to be conveniently uncoupled from the camera when its use is not desired.

17. The hooded polarizing tube of claim 13, wherein the tube is axially aligned with the camera lens and is positioned so as not to illuminate the camera lens other than via light reflected off a target and up through the camera lens.