# US 10,478,068 B2 · Camera device having a parabolic mirror set between dual cameras and method for shooting light having at least two wavelength bands > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,478,068 B2 - Document ID: US10478068B2 - Status: Granted - Kind: B2 - Application number: 15/869,710 - Filed: 2018-01-12 - Published: 2018-09-06 - Granted: 2019-11-19 - Earliest claimed: 2017-03-03 - Assignees: Ricoh Company, Ltd. - Applicants: Yupeng Zhang; Hong Yi; Weitao Gong; Haihua Yu; Wei Wang - Inventors: Yupeng Zhang; Hong Yi; Weitao Gong; Haihua Yu; Wei Wang - Web page: https://patentgrep.com/patent/US10478068B2 ## CPC - A61B 5/0035: {adapted for acquisition of images from more than one imaging mode, e.g. combining MRI and optical tomography} - A61B 5/0046: {Arrangements of imaging apparatus in a room, e.g. room provided with shielding or for improved access to apparatus} - A61B 5/0082: {adapted for particular medical purposes} - A61B 6/5247: {combining images from an ionising-radiation diagnostic technique and a non-ionising radiation diagnostic technique, e.g. X-ray and ultrasound} - G01T 1/1603: {with a combination of at least two different types of detectors} - G01T 1/295: {using coded aperture devices, e.g. Fresnel zone plates (handling of radiation of particles, e.g. using diaphragms, collimators, diffraction G21K1/00)} - H04N 23/11: for generating image signals from visible and infrared light wavelengths - H04N 23/55: Optical parts specially adapted for electronic image sensors; Mounting thereof - H04N 23/95: Computational photography systems, e.g. light-field imaging systems - A61B 5/1176: {Recognition of faces} - G02B 27/1006: {for splitting or combining different wavelengths (G02B27/1086, G02B27/141 take precedence)} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - G01T: MEASUREMENT OF NUCLEAR OR X-RADIATION (radiation analysis of materials, mass spectrometry G01N23/00; tubes for determining the presence, intensity, density or energy of radiation or particles H01J47/00) - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract Camera device and method for shooting light having at least two wavelength bands are disclosed. The camera device includes a first camera containing a first lens for receiving light having a first wavelength band; a second camera including a second lens for receiving light having a second wavelength band which is different from the first wavelength band, the second lens being disposed facing the first lens of the first camera; and a parabolic mirror set between the first camera and the second camera, able to let the light having the first wavelength band penetrate therethrough, and at the same time, reflect the light having the second wavelength band. The first camera is a non-fisheye camera. The first lens is a non-fisheye lens. The second camera and the parabolic mirror form a catadioptric camera. The aperture stop of the non-fisheye lens coincides with the focal point of the parabolic mirror. ## Claims ### Claim 1 A camera device comprising: a first camera containing a first lens for receiving light having a first wavelength band; a second camera including a second lens for receiving light having a second wavelength band different from the first wavelength band, the second lens being disposed facing the first lens of the first camera; and a parabolic mirror set between the first lens and the second lens, able to let the light having the first wavelength band penetrate therethrough, and at the same time, reflect the light having the second wavelength band, wherein, the first camera is a non-fisheye camera; the first lens of the first camera is a non-fisheye lens; the second camera and the parabolic mirror form a catadioptric camera; and an aperture stop of the non-fisheye lens coincides with a focal point of the parabolic mirror. ### Claim 2 (depends on 1) The camera device according to claim 1, further comprising: a first processor configured to calculate a distance p between the aperture stop of the non-fisheye lens and a central point of a front end of the non-fisheye camera by means of { p + l 1 k = y 1 x 1 p + l 2 k = y 2 x 2 , and compute a distance s from a vertex of the parabolic mirror to the central point of the front end of the non-fisheye camera by way of s=f−p, wherein, f is a focal length of the parabolic mirror; y1 is a height of a first object; y2 is a height of a second object; x1 is a height of an image generated from the first object; x2 is a height of an image created from the second object; l1 is a distance from the first object to the central point of the front end of the non-fisheye camera; l2 is a distance between the second object to the central point of the front end of the non-fisheye camera; and k is a distance from an imaging unit in the non-fisheye camera to the aperture stop of the non-fisheye lens. ### Claim 3 (depends on 1) The camera device according to claim 1, further comprising: a light barrier provided on a central part of a front surface of the parabolic mirror for shading a part of a curved surface of the parabolic mirror from light, so that the light cannot be reflected by or penetrate through the part of the curved surface of the parabolic mirror to enter the first camera and the second camera. ### Claim 4 (depends on 3) The camera device according to claim 3, further comprising: a second processor configured to determine a size of the light barrier based on z 1 = f + 2 ⁢ f ⁡ ( 1 - sec ⁢ ⁢ θ ) tan 2 ⁢ θ ⁢ ⁢ and ⁢ ⁢ x 1 = - 2 ⁢ f ⁡ ( 1 - sec ⁢ ⁢ θ ) tan ⁢ ⁢ θ , wherein, z1 and x1 are coordinates of one end of the light barrier in a Z-X coordinate system whose origin is located at a vertex of the parabolic mirror, Z axis is a common optical axis of the catadioptric camera and the non-fisheye camera, and X axis is perpendicular to Z axis; f is a focal length of the parabolic mirror; and θ is a half view angle corresponding to an edge point of the second camera. ### Claim 5 (depends on 1) The camera device according to claim 1, wherein, the catadioptric camera is an object side telecentric optical system. ### Claim 6 (depends on 1) The camera device according to claim 1, wherein, the light having the first wavelength band is visible light, and the light having the second wavelength band includes one of near-infrared light, short-wave infrared light, mid-wave infrared light, and long-wave infrared light; or the light having the second wavelength band is visible light, and the light having the first wavelength band includes one of near-infrared light, short-wave infrared light, mid-wave infrared light, and long-wave infrared light. ### Claim 7 A method of shooting light having at least two wavelength bands, comprising: receiving incident light by a parabolic mirror arranged between a first lens and a second lens disposed facing each other; reflecting light having a second wavelength band by the parabolic mirror, light having a first wavelength band different from the second wavelength band penetrating through the parabolic mirror at the same time; receiving the light having the first wavelength band by a first camera containing the first lens able to receive the light having the first wavelength band; receiving the light having the' second wavelength band by a second camera including the second lens able to receive the light having the second wavelength band; and performing photoelectric conversion on the received light having the first wavelength band and the received light having the second wavelength band so as to form two images, respectively, wherein, the first camera is a non-fisheye camera; the first lens of the first camera is a non-fisheye lens; the second camera and the parabolic mirror form a catadioptric camera; and an aperture stop of the non-fisheye lens coincides with a focal point of the parabolic mirror. ### Claim 8 (depends on 7) The method according to claim 7, before the letting incident light enter a parabolic mirror arranged between a first lens and a second lens disposed facing each other, further comprising: calculating a distance p between the aperture stop of the non-fisheye lens and a central point of a front end of the non-fisheye camera by means of { p + l 1 k = y 1 x 1 p + l 2 k = y 2 x 2 , and computing a distance s from a vertex of the parabolic mirror to the central point of the front end of the non-fisheye camera by way of s=f−p, wherein, f is a focal length of the parabolic mirror; y1 is a height of a first object; y2 is a height of a second object; x1 is a height of an image generated from the first object; x2 is a height of an image created from the second object; l1 is a distance from the first object to the central point of the front end of the non-fisheye camera; l2 is a distance between the second object to the central point of the front end of the non-fisheye camera; and k is a distance from an imaging unit in the non-fisheye camera to the aperture stop of the non-fisheye lens. ### Claim 9 (depends on 7) The method according to claim 7, further comprising: providing a light barrier on a central part of a front surface of the parabolic mirror for shading a part of a curved surface of the parabolic mirror from light, so that the light cannot be reflected by or penetrate through the part of the curved surface of the parabolic mirror to enter the first camera and the second camera. ### Claim 10 (depends on 9) The method according to claim 9, further comprising: determining a size of the light barrier based on z 1 = f + 2 ⁢ f ⁡ ( 1 - sec ⁢ ⁢ θ ) tan 2 ⁢ θ ⁢ ⁢ and ⁢ ⁢ x 1 = - 2 ⁢ f ⁡ ( 1 - sec ⁢ ⁢ θ ) tan ⁢ ⁢ θ , wherein, z1 and x1 are coordinates of one end of the light barrier in a Z-X coordinate system whose origin is located at a vertex of the parabolic mirror, Z axis is a common optical axis of the catadioptric camera and the non-fisheye camera, and X axis is perpendicular to Z axis; f is a focal length of the parabolic mirror; and θ is a half view angle corresponding to an edge point of the second camera.