# US 5,707,131 A · Collections and condensing optical system using cascaded concave reflectors > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,707,131 A - Document ID: US5707131A - Status: Granted - Kind: A - Application number: 08/590,930 - Filed: 1996-01-24 - Granted: 1998-01-13 - Earliest claimed: 1996-01-24 - Assignees: Cogent Light Technologies, Inc. - Inventors: Kenneth Li - Web page: https://patentgrep.com/patent/US5707131A ## CPC - F21V 7/00: Reflectors for light sources (characterised by cooling arrangements F21V29/505) - G02B 6/0006: {Coupling light into the fibre (in general G02B6/4298)} - F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract An electromagnetic radiation collecting and condensing optical system includes a number of cascaded concave reflectors and a number of electromagnetic radiation or light sources which radiate light energy onto the concave reflectors in such manner that the energy from each source is combined by the reflectors into a single output which is used to illuminate a target, such as a single core optical fiber. ## Claims ### Claim 1 An electromagnetic radiation collecting and condensing optical system for providing a high intensity light output with a relatively high radiation flux in a small area, comprising: a first concave reflector having an optical axis and a center of curvature; a first source of electromagnetic radiation located near the center of curvature of said first concave reflector but offset by a first predetermined distance from said optical axis; a second source of electromagnetic radiation located at a second predetermined distance substantially equal to said first predetermined distance from said optical axis opposite said first source; a second concave reflector having an optical axis and a center of curvature, oriented such that said second source is located near the center of curvature of said second concave reflector but offset by a third predetermined distance from the optical axis of said second concave reflector; and a target placed near the center of curvature of said second concave reflector but offset from the optical axis of said second concave reflector by a fourth predetermined distance substantially equal to said third predetermined distance opposite said second source, to collect electromagnetic radiation reflected by said second concave reflector. ### Claim 2 (depends on 1) The electromagnetic radiation collecting and condensing optical system according to claim 1, wherein said target is a single core optical fiber. ### Claim 3 (depends on 1) The electromagnetic radiation collecting and condensing optical system according to claim 1, wherein at least one of said first and second sources is a high intensity arc lamp. ### Claim 4 (depends on 3) The electromagnetic radiation collecting and condensing optical system according to claim 3, wherein said high intensity arc lamp is a xenon arc lamp. ### Claim 5 (depends on 1) The electromagnetic radiation collecting and condensing optical system according to claim 1, wherein at least one of said first and second concave reflectors is a toroidal mirror. ### Claim 6 (depends on 1) An electromagnetic radiation collecting and condensing optical system according to claim 1, wherein at least one of said first and second concave reflectors is an ellipsoidal mirror. ### Claim 7 A cascaded electromagnetic radiation collecting and condensing optical system for providing a high intensity light output with a relatively high radiation flux in a small area, comprising: a plurality of concave reflectors each having an optical axis and a center of curvature, and each receiving electromagnetic radiation from at least one source of electromagnetic radiation; a plurality of sources of electromagnetic radiation each located near the centers of curvature of at least two of said plurality of concave reflectors but offset by a predetermined distance from each of the optical axes of said two concave reflectors; and at least one target placed near the center of curvature of one of said plurality of concave reflectors but offset from the optical axis of said one of said concave reflectors by a predetermined distance substantially equal to but opposite the predetermined offset distance of the source being located near the center of curvature of said one of said concave reflectors, to collect electromagnetic radiation reflected by said one of said concave reflectors. ### Claim 8 (depends on 7) The cascaded electromagnetic radiation collecting and condensing optical system according to claim 7, further comprising a second target placed near the center of curvature of a second one of said plurality of concave reflectors but offset from the optical axis of said second one of said concave reflectors by a predetermined distance substantially equal to but opposite the predetermined offset distance of the source being located near the center of curvature of said second one of said concave reflectors, to collect electromagnetic radiation reflected by said second one of said concave reflectors. ### Claim 9 (depends on 7) The cascaded electromagnetic radiation collecting and condensing optical system according to claim 7, wherein said target is a single core optical fiber. ### Claim 10 (depends on 7) The cascaded electromagnetic radiation collecting and condensing optical system according to claim 7, wherein at least one of said plurality of sources is a high intensity arc lamp. ### Claim 11 (depends on 9) The cascaded electromagnetic radiation collecting and condensing optical system according to claim 9, wherein said high intensity arc lamp is a xenon arc lamp. ### Claim 12 (depends on 7) The cascaded electromagnetic radiation collecting and condensing optical system according to claim 7, wherein at least one of said plurality of concave reflectors is a toroidal mirror. ### Claim 13 (depends on 7) The cascaded electromagnetic radiation collecting and condensing optical system according to claim 7, wherein at least one of said plurality of concave reflectors is an ellipsoidal mirror. ### Claim 14 (depends on 7) The cascaded electromagnetic radiation collecting and condensing optical system according to claim 7, wherein said plurality of concave reflectors comprises at least three reflectors. ### Claim 15 (depends on 12) The cascaded electromagnetic radiation collecting and condensing optical system according to claim 12, wherein said plurality of sources comprises at least three sources.