Stereo endoscope and stereo endoscope imaging apparatus

• US 5,776,049 A
• Filed: 05/24/1995
• Issued: 07/07/1998
• Est. Priority Date: 12/24/1992
• Status: Expired due to Term

• Current Assignee: Olympus Optical Corporation Limited (Olympus Corporation)
• Original Assignee: Olympus Optical Corporation Limited (Olympus Corporation)
• Inventors: Takahashi, Susumu
• Primary Examiner(s): Apley, Richard J.
• Assistant Examiner(s): MULCAHY, JOHN M
• Application Number:
  US08/449,269
• Time in Patent Office: 1,140 Days
• Field of Search: 600/111, 600/166, 348/42, 348/45, 348/46, 348/47, 348/49, 348/55-57, 359/462, 359/473, 354/112, 354/114
• US Class Current: 600/111
• CPC Class Codes: A61B 1/00188 with focusing or zooming features
• CPC Class Codes: A61B 1/00193 adapted for stereoscopic vision
• CPC Class Codes: A61B 1/042 characterised by a proximal camera, e.g. a CCD camera
• CPC Class Codes: G02B 23/2415 Stereoscopic endoscopes
• CPC Class Codes: G02B 30/24 involving temporal multiplexing, e.g. using sequentially activated left and right shutters
• CPC Class Codes: H04N 13/161 Encoding, multiplexing or demultiplexing different image signal components for multi-view video sequence encoding H04N19/597
• CPC Class Codes: H04N 13/167 Synchronising or controlling image signals
• CPC Class Codes: H04N 13/189 Recording image signals; Reproducing recorded image signals
• CPC Class Codes: H04N 13/218 using spatial multiplexing
• CPC Class Codes: H04N 13/239 using two 2D image sensors having a relative position equal to or related to the interocular distance H04N13/243 takes precedence
• CPC Class Codes: H04N 13/296 Synchronisation thereof; Control thereof
• CPC Class Codes: H04N 13/324 Colour aspects
• CPC Class Codes: H04N 13/341 using temporal multiplexing
• CPC Class Codes: H04N 13/344 with head-mounted left-right displays
• CPC Class Codes: H04N 13/398 Synchronisation thereof; Control thereof
• CPC Class Codes: H04N 2013/0085 Motion estimation from stereoscopic image signals

Abstract

A stereo endoscope including a pair of objective optical systems, a pair of relay optical systems, an imagery optical system having a single optical axis, and a pair of imaging devices. The imagery optical system is a zoom optical system or a varifocal optical system. For example, an encoder is used to detect a magnitude of moving lenses in the zoom optical system. Based on the detected magnitude, a control unit allows the two imaging devices to approach or depart from each other. Thus, the stereo endoscope attains the coincidence between observation points of right and left fields of view against the displacement points of right and left object images resulting from variations of zooming magnifications.

Claims

1. A stereo endoscope imaging apparatus comprising:

a pair of right and left objective optical systems opposed to an object and arranged with a predetermined space therebetween so as to form a right object image and a left object image, respectively;

an image transmitting means for transmitting said right object image and said left object image formed to predetermined positions by said objective optical systems;

an imagery optical system having a single optical axis, for receiving said right and left object images from said image transmitting means and forming said right and left object images at predetermined positions; and

an imaging means for receiving said right and left object images from said imagery optical system and converting them into electrical signals,

wherein said imaging means includes two imaging devices that are arranged to optically receive said right and left object images formed by said imagery optical system, and which convert said right and left object images into electrical signals,

wherein said imagery optical system includes an adjustment optical system for performing at least one of magnification adjustment and focus adjustment on said right and left object images transmitted by said image transmitting means, said stereo endoscope imaging apparatus comprising;

a driving signal supplying means for applying a driving signal for reading electrical signals resulting from photoelectric conversion performed by said two imaging devices;

an optical system driving means for driving said adjustment optical system to effect at least one of said magnification adjustment and said focus adjustment;

a detecting means for detecting magnitude of adjustment effected by said adjustment optical system driven by said optical system driving means;

an image display timing correcting means for correcting the timing of displaying electrical signals, which is read by said driving signal supplying means and displayed as right and left images in a display means, so as to change at least one of the display positions of said right and left images; and

an image shift value generating means for providing a magnitude of correction of the display timing effected by said image display timing correcting means according to the magnitude of adjustment detected by said detecting means,

wherein said image display timing correction means includes;

a memory means for temporarily storing electrical signals read with said driving signal; and

a read timing regulating means for regulating the timing of reading electrical signals as right and left images from said memory means according to a magnitude of correction effected by said image shift value generating means.