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US 10,520,719 B2Granted
Image acquisition device
AssigneeOlympus Corporation
InventorIkutoshi Fukushima
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AssigneeOlympus Corporation
InventorIkutoshi Fukushima
Estimating the term…
An image acquisition device including: an imaging optical system forming two images having parallax; and an element acquiring the parallax images, the imaging optical system includes: a first negative lens group having negative refractive power; a first positive lens group having positive refractive power; and a second positive lens group having positive refractive power, the first negative lens group includes two negative lens groups disposed side by side in the parallax direction and having central axes respectively, the first positive lens group is a common lens group having a single central axis, and light rays emitted from the negative lens groups pass therethrough, the second positive lens group includes two positive lens groups disposed side by side in the parallax direction and having central axes respectively and the first positive lens group includes a moving lens group moved along the central axis of the first positive lens group.
An image acquisition device comprising:
An endoscope comprising:
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
From the US filing history. Foreign family members aren’t listed.
Of the distal end: objectives for endoscopes
Characterised by distal tip features: optical elements
Optical arrangements: adapted for stereoscopic vision
Having 3 layers only: arranged - + -
About 9 years 1 month of term left · ends 15 Nov 2035 (estimated)
The present invention relates to an image acquisition device.
There is a known stereoscopic imaging optical system in which two lens systems having different optical axes are disposed at a distal end thereof, in order to acquire parallax images required for stereoscopic viewing (for example, see PTL
In this stereoscopic imaging optical system, one lens group is moved in the optical-axis direction in order to adjust the focal position on an object surface.
FIG. 1 is a view showing ray tracing of the principal ray when a moving lens group in an image acquisition device according to a first embodiment of the present invention is located at a far-point position.
FIG. 2 is a view showing ray tracing of the principal ray when the moving lens in the image acquisition device shown in FIG. 1 is located at a near-point position.
FIG. 3 is a view showing a lens array of an imaging optical system according to Example 1 of the image acquisition device shown in FIG. 1.
An image acquisition device 1 according to a first embodiment of the present invention will be described below with reference to the drawings.
The image acquisition device 1 of this embodiment is, for example, an image acquisition device that is provided at the distal end of an insertion portion of an endoscope and, as shown in FIGS. 1 and 2, is provided with an imaging optical system 2 and an image acquisition element 3.
The imaging optical system 2 is provided with, in order from an object side toward an image side, a first negative lens group 4 having a negative refractive power, a first positive lens group 5 having a positive refractive power, and a second positive lens group 6 having a positive refractive power, and forms two parallax images.