# US 2021/0239603 A1 · Illumination unit with multiple light sources for generating a uniform illumination spot > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0239603 A1 - Document ID: US20210239603A1 - Status: Published application - Kind: A1 - Application number: 17/051,837 - Filed: 2019-05-03 - Published: 2021-08-05 - Earliest claimed: 2018-05-04 - Assignees: Siemens Healthcare Diagnostics Inc. - Applicants: Siemens Healthcare Diagnostics Inc. - Inventors: Jeffrey R. Jasperse - Web page: https://patentgrep.com/patent/US20210239603A1 ## CPC - G01J 3/0229: {using masks, aperture plates, spatial light modulators or spatial filters, e.g. reflective filters} - G01N 21/255: {Details, e.g. use of specially adapted sources, lighting or optical systems} - G01J 3/0256: {Compact construction} - G01J 3/0291: {Housings; Spectrometer accessories; Spatial arrangement of elements, e.g. folded path arrangements} - G01J 3/10: Arrangements of light sources specially adapted for spectrometry or colorimetry - G01N 21/274: {Calibration, base line adjustment, drift correction} - G01N 21/31: Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry {(G01N21/72 takes precedence)} - G01N 33/491: {by separating the blood components (G01N15/05 takes precedence)} - G02B 5/005: {Diaphragms (for cameras G03B9/02)} - G02B 27/143: {using macroscopically faceted or segmented reflective surfaces} - G01J 2003/102: {Plural sources} - G01N 2021/3144: {for oxymetry} - G01N 2201/061: Sources - G01N 2201/062: LED's - G01N 2201/0636: Reflectors - G01N 2201/127: Calibration; base line adjustment; drift compensation - G01J: MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY (light sources F21, H01J, H01K, H05B; investigating properties of materials by optical means G01N) - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract An illumination unit is described that includes a first light source positioned on a first axis and a second light source on a second axis that intersects and is angularly offset with respect to the first axis. The illumination unit includes a reflector having an aperture through which the first axis extends and a reflective surface angled with respect to the first axis and second axis. ## Claims ### Claim 1 An illumination unit, comprising: a housing assembly that defines an internal space; a first light source mounted to the housing assembly in the internal space, the first light source positioned on a first axis; a second light source mounted to the housing assembly in the internal space on a second axis that intersects and is angularly offset with respect to the first axis; and a reflector in the internal space of the housing assembly, the reflector including an aperture through which the first axis extends and a reflective surface angled with respect to the first axis and second axis. ### Claim 2 (depends on 1) The illumination unit according to claim 1, wherein the first light source is a light emitting diode. ### Claim 3 (depends on 1) The illumination unit according to claim 1, wherein the second light source is a neon lamp. ### Claim 4 (depends on 1) The illumination unit according to claim 1, wherein the reflective surface is disposed along a reflector plane, the reflector plane and the first axis defining a first angle that is less than about 90 degrees. ### Claim 5 (depends on 4) The illumination unit according to claim 4, wherein the first angle is between 15 degrees and 75 degrees. ### Claim 6 (depends on 1) The illumination unit according to claim 1, wherein the reflective surface is disposed along a reflector plane, the reflector plane and the second axis defining a second angle that is less than about 90 degrees. ### Claim 7 (depends on 1) The illumination unit according to claim 1, wherein the second angle is between 15 degrees and 75 degrees. ### Claim 8 (depends on 1) The illumination unit according to claim 1, wherein the first axis and the second axis intersect to define an angle that is between 45 degree and 135 degrees. ### Claim 9 (depends on 1) The illumination unit according to claim 1, wherein first light source and the second light source lie in a common plane that includes the first axis. ### Claim 10 (depends on 1) The illumination unit according to claim 1, further comprising: a reflector positioned adjacent to the second light source opposite the reflector. ### Claim 11 (depends on 1) The illumination unit according to claim 1, further comprising: a light sensor positioned proximate the first light source and configured to monitor the intensity of the first light signal emitted from the first light source. ### Claim 12 (depends on 1) The illumination unit according to claim 1, wherein the aperture is an elliptical aperture and the reflective surface is angled such that light traveling from the first light source though the aperture creates a circular beam of light. ### Claim 13 (depends on 1) The illumination unit according to claim 1, further comprising a lens positioned in the housing assembly on the first axis opposite the reflector. ### Claim 14 An illumination unit, comprising: a first light source positioned on a first axis; a second light source positioned on a second axis that intersects and is angularly offset with respect to the first axis; and a reflector position on the first and second axes, the reflector having an elliptical aperture through which the first axis extends and a reflective surface, the reflective surface being angled with respect to the first axis and the second axis such that light traveling from the first light source through the elliptical aperture creates a circular beam of light on a target positioned on the first axis opposite the first light source relative to the reflector. ### Claim 15 (depends on 14) The illumination unit according to claim 14, further comprising a lens positioned on the first axis opposite the reflector. ### Claim 16 (depends on 14) The illumination unit according to claim 14, wherein the first light source is a light emitting diode. ### Claim 17 (depends on 14) The illumination unit according to claim 14, wherein the second light source is a neon lamp. ### Claim 18 (depends on 14) The illumination unit according to claim 14, wherein the reflective surface is disposed along a reflector plane, the reflector plane and the first axis defining a first angle that is less than about 90 degrees. ### Claim 19 (depends on 18) The illumination unit according to claim 18, wherein the first angle is between 15 degrees and 75 degrees. ### Claim 20 (depends on 14) The illumination unit according to claim 14, wherein the reflective surface is disposed along a reflector plane, the reflector plane and the second axis defining a second angle that is less than about 90 degrees. ### Claim 21 (depends on 14) The illumination unit according to claim 14, wherein the second angle is between 15 degrees and 75 degrees. ### Claim 22 (depends on 14) The illumination unit according to claim 14, wherein the first axis and the second axis intersect to define an angle that is between 45 degree and 135 degrees. ### Claim 23 (depends on 14) The illumination unit according to claim 14, wherein first light source and the second light source lie in a common plane that includes the first axis. ### Claim 24 (depends on 14) The illumination unit according to claim 14, further comprising: another reflector positioned adjacent to the second light source opposite the reflector. ### Claim 25 (depends on 14) The illumination unit according to claim 14, further comprising: a light sensor positioned proximate the first light source and configured to monitor the intensity of the first light signal emitted from the first light source. ### Claim 26 (depends on 14) The illumination unit according to claim 14, further comprising a housing assembly that defines an internal space, wherein the first light source, the second light source, and the reflector are contained in the internal space of the housing assembly.