IMAGE PICKUP DEVICE
To downsize a device, suppress occurrent and invasion of foreign objects, and obtain a visible-light image and a near-infrared light image with high quality using only one device. There is provided an imaging device comprising a optical system, an image sensor for imaging an optical image of an object passing through the optical system, and a filter arranged in an optical path from the object to the image sensor, wherein the filter comprises a first filter partially blocking the optical path and a second filter entirely blocking the optical path, the first filter shields a near-infrared light and the second filter transmits two wavelength groups of a visible-light and the near-infrared light, and the image sensor comprises a first imaging unit for forming the image of light which does not pass through the first filter and passes through the second filter, and a second imaging unit for forming the image of light which passes through both of the first filter and the second filter.
1 . An imaging device comprising,
an optical system,
an image sensor for imaging an optical image of an object passing through said optical system, and
a filter arranged in an optical path from said object to said image sensor, wherein said filter comprises a first filter partially blocking said optical path and a second filter entirely blocking said optical path, said first filter shields a near-infrared light and said second filter transmits two wavelength groups of a visible-light and the near-infrared light, and said image sensor comprises a first imaging unit for forming the image of light which does not pass through the first filter and passes through the second filter, and a second imaging unit for forming the image of light which passes through both of said first filter and said second filter.
2 . The imaging device according to claim 1 further comprising a signal reading unit for reading a video and picture signal from said image sensor, wherein said signal reading unit is configured to separately read out video and picture signals from said first imaging unit and said second imaging unit.
3 . The imaging device according to claim 1 , wherein relative positions of said filters are fixed against said image sensor.
4 . The imaging device according to claim 1 , wherein said first filter is arranged inside said optical system, and the second filter is arranged outside said optical system.
5 . The imaging device according to claim 1 comprising a translucent substrate arranged in a direction perpendicular to an optical axis of said optical system, wherein said first filter is a near-infrared light shielding film formed on said substrate.
6 . The imaging device according to claim 5 , wherein said substrate has a configuration which an area without forming the near-infrared light shielding film is cut.
7 . The imaging device according to claim 6 , wherein a normal line intersects said optical axis at an angle on a cut plane made by cutting said substrate.
8 . The imaging device according to claim 7 , wherein a light shielding film for shielding all lights is formed on said cut plane.
9 . The imaging device according to claim 1 , wherein a clear filter for transmitting all lights is arranged on an imaging plane of said first imaging unit, and the color filter is also arranged on the imaging plane of said second imaging unit.
10 . The imaging device according to claim 1 , wherein said second filter transmits lights of wavelength groups of 400 nm to 650 nm, and 800 nm to 850 nm, respectively.
11 . The imaging device according to claim 1 , wherein said first filter shields the light having the wavelength of 650 nm or more.
12 . The imaging device according to claim 1 , wherein said imaging device takes the images in a fixed focus method.
13 . The imaging device according to claim 1 , wherein said imaging device has auto focus function.