# US 10,313,643 B2 · Imaging system having four image sensors > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,313,643 B2 - Document ID: US10313643B2 - Status: Granted - Kind: B2 - Application number: 15/456,937 - Filed: 2017-03-13 - Published: 2018-09-13 - Granted: 2019-06-04 - Earliest claimed: 2017-03-13 - Assignees: OmniVision Technologies, Inc. - Applicants: OmniVision Technologies, Inc. - Inventors: Chun-Sheng Fan - Web page: https://patentgrep.com/patent/US10313643B2 ## CPC - H04N 23/16: Optical arrangements associated therewith, e.g. for beam-splitting or for colour correction - G02B 27/1013: {for colour or multispectral image sensors, e.g. splitting an image into monochromatic image components on respective sensors (spectral imaging systems G01J)} - G02B 27/141: {using dichroic mirrors} - G02B 27/146: {with a tree or branched structure} - H04N 23/11: for generating image signals from visible and infrared light wavelengths - H04N 23/45: for generating image signals from two or more image sensors being of different type or operating in different modes, e.g. with a CMOS sensor for moving images in combination with a charge-coupled device [CCD] for still images - H04N 25/705: Pixels for depth measurement, e.g. RGBZ - G02B 13/0085: {employing wafer level optics} - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract An imaging system having four image sensors comprises a first dichroic filter, a second dichroic filter, and a third dichroic filter. The first dichroic filter reflects light having a first wavelength band and a second wavelength band toward a second dichroic filter, and transmits light having a third wavelength band and a fourth wavelength band toward the third dichroic filter. The second dichroic filter reflects light having the first wavelength band toward the first image sensor, and transmits light having the second wavelength band toward the second image sensor. The third dichroic filter reflects light having the third wavelength band toward the third image sensor, and transmits light having the fourth wavelength band toward the fourth image sensor. The first dichroic filter, the second dichroic filter, and the third dichroic filter are included in an integrated part. ## Claims ### Claim 1 An imaging system comprising: an imaging lens; a first dichroic filter, a second dichroic filter, and a third dichroic filter; and a first image sensor, a second image sensor, a third image sensor, and a fourth image sensor; wherein the first dichroic filter reflects light having a first wavelength band and a second wavelength band toward a second dichroic filter, and transmits light having a third wavelength band and a fourth wavelength band toward the third dichroic filter, the second dichroic filter reflects light having the first wavelength band toward the first image sensor, and transmits light having the second wavelength band toward the second image sensor, and the third dichroic filter reflectes light having the third wavelength band toward the third image sensor, and transmits light having the fourth wavelength band toward the fourth image sensor; wherein the imaging lens forms a 2D image of the first wavelength band on the first image sensor, a 2D image of the second wavelength band on the second image sensor, a 2D image of the third wavelength band on the third image sensor, and a 2D image of the fourth wavelength band on the fourth image sensor; and wherein the first dichroic filter, the second dichroic filter, and the third dichroic filter are included in an integrated part. ### Claim 2 (depends on 1) The imaging system of claim 1, wherein the integrated part comprises a first beam splitter cube having the first dichroic filter, a second beam splitter cube having the second dichroic filter, and a third beam splitter cube having the third dichroic filter. ### Claim 3 (depends on 2) The imaging system of claim 2, wherein the second dichroic filter is perpendicular to the first dichroic filter and the third dichroic filter is perpendicular to the first dichroic filter. ### Claim 4 (depends on 2) The imaging system of claim 2, wherein the second dichoric filter is parallel to the first dichroic filter. ### Claim 5 (depends on 4) The imaging system of claim 4, wherein the first beam splitter cube is integrated with the second beam splitter cube to form a single part having the first dichroic filter and the second dichroic filter. ### Claim 6 (depends on 1) The imaging system of claim 1, wherein the integrated part comprises a first prism, a second prism, a third prism, and a fourth prism, the first prism and the second prism have the same size, the third prism and the fourth prism have a size one half of the first prism. ### Claim 7 (depends on 6) The imaging system of claim 6, wherein the first dichroic filter is disposed on an interface of the first prism and the second prism, the second dichroic filter is disposed on an interface of the first prism and the third prism, and the third dichroic filter is disposed on an interface of the second prism and the fourth prism. ### Claim 8 (depends on 1) The imaging system of claim 1, wherein the integrated part comprises a first prism, a second prism, and a third prism, the first prism and the second prism have the same size, the third prism has a size double the size of the first prism. ### Claim 9 (depends on 8) The imaging system of claim 8, wherein the first dichroic filter is disposed on an interface of the first prism and the second prism, the second dichroic filter is disposed on an interface of the first prism and the third prism, and the third dichroic filter is disposed on an interface of the second prism and the third prism. ### Claim 10 (depends on 1) The imaging system of claim 1, wherein the imaging lens is a wafer-level lens. ### Claim 11 (depends on 1) The imaging system of claim 1, wherein the first image sensor, the second image sensor, the third image sensor, and the fourth image sensor have no color filter array covering light sensitive pixels. ### Claim 12 (depends on 1) The imaging system of claim 1, wherein the first wavelength band corresponds to blue color, the second wavelength band corresponds to green color, and the third wavelength band corresponds to red color. ### Claim 13 (depends on 12) The imaging system of claim 12, wherein the fourth wavelength band corresponds to yellow color. ### Claim 14 (depends on 12) The imaging system of claim 12, wherein the fourth wavelength band corresponds to infrared. ### Claim 15 (depends on 14) The imaging system of claim 14, wherein the fourth image sensor comprises time-of-flight pixels capable of detecting a distance from a target to the fourth image sensor.