Stereoscopic endoscope

• US 7,405,877 B1
• Filed: 02/10/2003
• Issued: 07/29/2008
• Est. Priority Date: 02/10/2003
• Status: Active Grant

• Current Assignee: Visionsense Ltd. (Medtronic Plc)
• Original Assignee: Visionsense Ltd. (Medtronic Plc)
• Inventors: Schechterman, Mark
• Primary Examiner(s): Chang; Audrey Y
• Application Number:
  US10/364,053
• Time in Patent Office: 1,996 Days
• Field of Search: 359/465, 359/462, 359/352, 359/495, 359/498, 359/464, 353/8, 348/43, 348/49, 348/57, 600/111, 600/101, 600/166
• US Class Current: 359/465
• CPC Class Codes: A61B 1/00096 Optical elements
• CPC Class Codes: A61B 1/00193 adapted for stereoscopic vision
• CPC Class Codes: G02B 23/2415 Stereoscopic endoscopes

Abstract

Stereoscopic device, including a first image detector and a second image detector, a first entrance pupil, receiving a first image of an object, a second entrance pupil, receiving a second image the object, a directional image separator, receiving the first and second images from the respective first and second entrance pupils, a common optical imaging assembly, located between the entrance pupil and the directional image separator, conveying the images from the respective entrance pupils to the directional image separator, providing the first image to the directional image separator in a first source direction, and providing the second image to the directional image separator in a second source direction, wherein the directional image separator includes a directionally selective surface, the directionally selective surface reflecting the first image in a first target direction, towards the first image detector, and transmitting the second image in a second target direction, towards the second image detector, and wherein the first image and the second image are at least partially overlapping, when arriving at the directionally selective surface.

Claims

1. Stereoscopic device comprising:

a first entrance pupil, receiving a first image of at least one object;

a second entrance pupil, receiving a second image of said at least one object;

a directional image separator, receiving said first image from said first entrance pupil and receiving said second image from said second entrance pupil;

a common optical imaging assembly, located between said entrance pupils and said directional image separator, conveying said first image from said first entrance pupil to said directional image separator, conveying said second image from said second entrance pupil to said directional image separator, providing said first image to said directional image separator in a first source direction, and providing said second image to said directional image separator in a second source direction;

a first image detector; and

a second image detector,

wherein said directional image separator comprises a directionally selective surface, said directionally selective surface reflecting said first image in a first target direction, towards said first image detector, and transmitting said second image in a second target direction, towards said second image detector, and

wherein said first image and said second image are at least partially overlapping, when arriving at said directionally selective surface.

2. The stereoscopic device according to claim 1, wherein said directional image separator comprises at least one prism, said at least one prism comprising a plurality of prism surfaces,

wherein at least one of said prism surfaces is an entrance surface, for receiving said first and second images,

wherein said at least one prism surface defines said directionally selective surface,

wherein said at least one prism surface is an exit surface, for transmitting said first image toward said first image detector, and

wherein at least another one of said prism surfaces is another exit surface, for reflecting said second image toward said second image detector.

3. The stereoscopic device according to claim 1, wherein said directional image separator comprises a portion of dielectric material, said portion of dielectric material comprising at least one surface, defining said directionally selective surface.

4. The stereoscopic device according to claim 1, wherein said directional image separator further comprises a prism,

wherein said prism comprises at least a first surface, for receiving said second image from said directionally selective surface, and a second surface, for transmitting said second image towards said second image detector.

5. The stereoscopic device according to claim 1, wherein at least one of said first image detector and said second image detector comprises a two-dimensional image sensor array.

6. The stereoscopic device according to claim 5, said first image detector comprising a first and said second image detector comprises a two-dimensional image sensor array, said first two-dimensional image sensor array and said second two-dimensional image sensor array oriented substantially orthogonal there between.

7. The stereoscopic device according to claim 6, wherein one of said first said first two-dimensional image sensor array and said second two-dimensional image sensor array is substantially perpendicular to the optical axis of said common optical imaging assembly.

8. The stereoscopic device according to claim 1, wherein said first entrance pupil, said second entrance pupil, said directional image separator, said common optical imaging assembly, said first image detector and said second image detector are located within an endoscope.

9. Method for producing a stereoscopic image, the method comprising the procedures of:

receiving a first image through a first entrance pupil;

receiving a second image through a second entrance pupil;

conveying said first image through a common optical assembly from said first entrance pupil to a directional image separator and providing said first image to said directional image separator in a first source direction;

conveying said second image through said common optical assembly from said second entrance pupil to said directional image separator and providing said second image to said directional image separator in a second source direction;

reflecting said first image, at a directionally selective surface, in a first target direction, towards a first image detector; and

transmitting said second image, at said directionally selective surface, in a second target direction, towards a second image detector,

wherein said first image and said second image are at least partially overlapping, when arriving at said directionally selective surface.

10. The method according to claim 9, further comprising the procedures of:

detecting said first image; and

detecting said second image.