# US 10,480,739 B2 · Headlamp for vehicles having at least one laser light module > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,480,739 B2 - Document ID: US10480739B2 - Status: Granted - Kind: B2 - Application number: 15/780,475 - Filed: 2016-12-16 - Published: 2018-12-06 - Granted: 2019-11-19 - Earliest claimed: 2015-12-22 - Assignees: ZKW Group GmbH - Applicants: Zkw Group GmbH - Inventors: Markus Danner; Michael Riesenhuber; Bettina Reisinger; Peter Mayer - Web page: https://patentgrep.com/patent/US10480739B2 ## CPC - F21S 41/16: Laser light sources - F21S 41/176: Light sources where the light is generated by photoluminescent material spaced from a primary light generating element - F21S 41/14: characterised by the type of light source - F21S 41/29: Attachment thereof (for achieving variable light distribution F21S41/63) - F21S 41/322: {the reflector using total internal reflection} - F21S 45/70: Prevention of harmful light leakage - G02B 27/0972: {Prisms (prisms per se G02B5/04)} - G02B 27/126: {The splitting element being a prism or prismatic array, including systems based on total internal reflection} - G02B 27/30: Collimators - F16C 2300/14: Large applications, e.g. bearings having an inner diameter exceeding 500 mm - F21Y 2115/30: Semiconductor lasers - F21S: NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS - F21Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED ## Abstract A headlamp (1) for vehicles having at least one laser light module (3l, 3m, 3r) which has a laser light source (11) and a phosphorus element (13) which is arranged downstream of the latter in the beam path and a front-end optical system (16) in which the at least one laser light module is arranged in a housing (2) of the headlamp which has a projection optical system (4) for projecting the light distribution generated in the focal plane of the projection optical system of the at least one laser light module into the carriageway space, and at least one deflection prism (20; 22, 23) is integrated into the at least one front-end optical system (16), which deflection prism (20; 22, 23) lies in the region of the laser beam (15; 15-1, 15-2) which occurs when the phosphorus element (13) is defective or missing and which deflects this laser beam occurring in the event of disruption and keeps it away from the projection optical system and therefore from the carriageway space. ## Claims ### Claim 1 A headlight (1) for vehicles comprising: at least one laser light module (3l, 3m, 3r) that includes a laser light source (11), and a phosphorus element (13) situated downstream therefrom in the beam path; at least one optical attachment (16); and at least one deflection prism (20, 22, 23) integrated into the at least one optical attachment (16), wherein the at least one laser light module (3l, 3m, 3r) is situated in a housing (2) of the headlight (1), which has projection optics (4) configured for projecting the light distribution, generated in the focal plane of the projection optics of the at least one laser light module, into a roadway space, and wherein the at least one deflection prism (20; 22, 23) is configured to be situated in the area of laser radiation (15; 15-1, 15-2) that passes through when the phosphorus element (13) is defective or missing, and to deflect this laser radiation that occurs in the event of a malfunction and keep it away from the projection optics (4) and thus, away from the roadway space, and wherein the optical attachment (16) is configured as a total internal reflection (TIR) optics system, and the at least one deflection prism (20; 22, 23) is formed by a recess on a front side of the optical attachment (16). ### Claim 2 (depends on 1) The headlight (1) according to claim 1, wherein the optical axis of the optical attachment (16) differs from the direction of the generated laser beam, and when the phosphorus element (13) is defective or missing, the laser radiation is split into two partial beams (15-1, 15-2), a deflection prism (22, 23) being associated with each partial beam. ### Claim 3 (depends on 1) The headlight (1) according to claim 1, wherein the light entry surface of the deflection prism (20; 22, 23) is adapted to the cross section of the laser beam (15; 15-1, 15-2) that arises in the event of a malfunction. ### Claim 4 (depends on 3) The headlight (1) according to claim 3, wherein the at least one deflection prism (20; 22, 23) is oriented with respect to a laser beam (15; 15-1, 15-2), which arises in the event of a malfunction, in such a way that the deflection of the laser beam takes place in parallel to the shorter axis of the beam cross section. ### Claim 5 (depends on 1) The headlight (1) according to claim 1, wherein a photosensor is situated in the housing (2) of the headlight (1) in the incidence area of the at least one laser beam (15; 15-1, 15-2) that is deflected in the event of a malfunction, the photosensor being connected to a detection device that is configured for emitting a warning signal and/or switching off the at least one laser light source (11) in the event of a malfunction. ### Claim 6 (depends on 1) The headlight (1) according to claim 1, wherein a radiation-absorbing means (6) is provided in the housing (2) of the headlight (1) in the incidence area of the at least one laser beam (15; 15-1, 15-2) that is deflected in the event of a malfunction. ### Claim 7 (depends on 1) The headlight (1) according to claim 1, comprising at least two of the laser light modules (3l, 3m, 3r), wherein the position of the optical axis of the optical attachment (16) in relation to the direction of the generated laser beam is different for the at least two laser light modules. ### Claim 8 (depends on 1) The headlight (1) according to claim 1, comprising at least two of the laser light modules (3l, 3m, 3r), the laser light sources (11) of which are configured to generate a laser beam having an elliptical beam cross section, wherein the axial position of the elliptical beam cross section in relation to the optical main axis of the headlight is different for the at least two laser light modules. ### Claim 9 (depends on 1) The headlight (1) according to claim 1, wherein the TIR optics (16) have a collimating design for laser radiation that occurs in the event of a malfunction, and a collimated interfering beam is directed away from the projection optics (4).