# US 12,216,278 B2 · Light source device and electronic device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,216,278 B2 - Document ID: US12216278B2 - Status: Granted - Kind: B2 - Application number: 18/745,119 - Filed: 2024-06-17 - Published: 2024-10-10 - Granted: 2025-02-04 - Earliest claimed: 2021-03-29 - Assignees: Maxell, Ltd. - Applicants: Maxell, Ltd. - Inventors: Koji Hirata; Toshinori Sugiyama; Yasuhiko Kunii - Web page: https://patentgrep.com/patent/US12216278B2 ## CPC - G02B 27/0101: {characterised by optical features (G02B27/0172 takes precedence)} - B60K 35/10: Input arrangements, i.e. from user to vehicle, associated with vehicle functions or specially adapted therefor - B60K 35/23: Head-up displays [HUD] (optical aspects of head-up displays G02B27/01) - B60K 35/231: characterised by their arrangement or structure for integration into vehicles - B60K 35/60: Instruments characterised by their location or relative disposition in or on vehicles (arrangements of lighting devices on dashboards B60Q3/10) - F21S 2/00: Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction - F21V 9/32: characterised by the arrangement of the photoluminescent material - G02B 5/26: Reflecting filters (G02B5/28 takes precedence) - G02B 5/3066: {involving the reflection of light at a particular angle of incidence, e.g. Brewster's angle} - G02B 19/0061: {the light source comprising a LED} - G03B 21/204: {using secondary light emission, e.g. luminescence or fluorescence (using different colours G03B33/00; if related to video signals H04N9/3197)} - G03B 21/208: {Homogenising, shaping of the illumination light} - B60K 2360/23: using reflectors - B60K 2360/332: Light emitting diodes - B60K 2360/334: Projection means - B60K 2360/336: Light guides - G02B 5/3025: {Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state (G02B5/3008, G02B5/3016 take precedence)} - G02B 27/01: Head-up displays - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES - F21S: NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS - F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR - G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D) ## Abstract A light source device which is miniaturized, can be manufactured at low cost, and is suitable as an illumination light source of a display device of an electronic device such as an HUD and an aerial floating image display apparatus is provided. The light source device includes: a light source configured to generate white light by irradiating a phosphor with light emitted from a solid-state light source; a collimating optical system (15) configured to convert a divergent light flux of the white light emitted from the light source into parallel light; a light guide configured to cause the light emitted from the collimating optical system (15) to be incident as incident light and emit the incident light in a direction different from an incident direction; and a filter configured to reflect light in a blue region of the parallel light to irradiate the phosphor. ## Claims ### Claim 1 A head-up display device comprising: a display element configured to display an image; a light source device configured to irradiate light to the display element; and an optical system configured to display a virtual image based on light from the display element, the light source device comprising: a light source configured to generate white light by irradiating a phosphor with light emitted from a solid-state light source; a collimating optical system configured to convert a divergent light flux of the white light emitted from the light source into parallel light; a light guide configured to cause the light emitted from the collimating optical system to be incident as incident light and emit the incident light in a direction different from an incident direction; and a filter configured to reflect light in a blue region of the parallel light to irradiate the phosphor. ### Claim 2 (depends on 1) The head-up display device according to claim 1, wherein the filter is provided on an emission surface of the collimating optical system. ### Claim 3 (depends on 1) The head-up display device according to claim 1, comprising a diffusion block between the collimating optical system and the light guide and configured to diffuse the parallel light, wherein the filter is provided on an incidence surface of the diffusion block. ### Claim 4 (depends on 3) The head-up display device according to claim 3, wherein the filter is provided on each of an emission surface of the collimating optical system and the incidence surface of the diffusion block. ### Claim 5 (depends on 1) The head-up display device according to claim 1, wherein a divergence angle of a light source emitted from a light source that generates white light by irradiating a phosphor with light emitted from the solid-state light source is 80 degrees or more. ### Claim 6 (depends on 1) The head-up display device according to claim 1, wherein the filter has a cutoff wavelength of 435 (nm) or less at which a reflectance is 50%. ### Claim 7 (depends on 1) The head-up display device according to claim 1, comprising a polarization conversion element between the collimating optical system and the light guide and configured to align a polarization direction of light in one direction. ### Claim 8 (depends on 1) The head-up display device according to claim 1, wherein the light guide includes an incidence portion on which the incident light is incident, a reflection portion which reflects the incident light, and an emission portion which emits light reflected by the reflection portion, and wherein the reflection portion includes a plurality of reflection surfaces that reflect the incident light and a plurality of connection surfaces that connect the plurality of reflection surfaces, and the incidence portion has a structure that deflects light in a direction in which an incidence angle of the incident light that is incident on the reflection surface of the reflection portion becomes larger. ### Claim 9 (depends on 8) The head-up display device according to claim 8, comprising a scatterer between the collimating optical system and the light guide, wherein the connection surface is inclined with respect to the incident light at an angle at which a shadow is formed within a range of a half-value angle of the scatterer. ### Claim 10 (depends on 8) The head-up display device according to claim 8, wherein the incidence surface is an inclined surface disposed obliquely with respect to the incident light. ### Claim 11 (depends on 10) The head-up display device according to claim 10, wherein at least a part of the incidence surface is a curved surface. ### Claim 12 (depends on 9) The head-up display device according to claim 9, wherein an elevation angle of the reflection surface varies depending on a location, and a relative angle between the reflection surface and the connection surface adjacent to each other is 90 degrees or more. ### Claim 13 (depends on 12) The head-up display device according to claim 12, wherein the relative angle is a constant value regardless of location. ### Claim 14 (depends on 8) The head-up display device according to claim 8, wherein a structure that diffuses light is formed on an emission surface of the collimating optical system.