# US 12,601,888 B2 · Lens module and projection device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,601,888 B2 - Document ID: US12601888B2 - Status: Granted - Kind: B2 - Application number: 17/678,063 - Filed: 2022-02-23 - Published: 2023-08-24 - Granted: 2026-04-14 - Earliest claimed: 2022-02-23 - Assignees: Coretronic Corporation - Applicants: Coretronic Corporation - Inventors: Mi-Wen Chen - Web page: https://patentgrep.com/patent/US12601888B2 ## CPC - G02B 7/02: for lenses {(supports for magnifying lenses G02B25/002)} - G02B 7/008: {with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation} - G02B 7/021: {for more than one lens} - G02B 7/026: {using retaining rings or springs (G02B7/027 takes precedence)} - G02B 7/028: {with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation} - G03B 21/145: {Housing details, e.g. position adjustments thereof} - G03B 21/147: {Optical correction of image distortions, e.g. keystone} - G03B 21/16: Cooling; Preventing overheating - 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} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - 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 lens module includes a lens fixing device and a base. The lens fixing device includes: a lens holder, a lens, a plurality of elastic sheets, and a shielding sheet. The lens is assembled on the lens holder. The plurality of elastic sheets is locked on the lens holder and pressed around an edge of the lens. The shielding sheet is arranged on at least one of the plurality of elastic sheets, and is located on a transmission path of an excitation light beam to prevent the excitation light beam from directly irradiating the at least one of the plurality of elastic sheets. The lens holder is assembled on the base. ## Claims ### Claim 1 A lens module, comprising: a lens fixing device and a base; wherein the lens fixing device, comprises: a lens holder, assembled on the base; a lens, assembled on the lens holder; a plurality of elastic sheets, locked on the lens holder and pressed around an edge of the lens; and a shielding sheet, arranged on at least one of the plurality of elastic sheets, a length of the shielding sheet in a radial direction of the lens being larger than a length of the at least one of the plurality of elastic sheets in the radial direction of the lens, wherein the lens is configured to receive an excitation light beam in a manner that a main optical axis of the excitation light beam is incident on an incident position of the lens where the incident position has an offset from a center axis of the lens, and the at least one of the plurality of elastic sheets is arranged closer to the incident position of the lens than others of the plurality of elastic sheets. ### Claim 2 (depends on 1) The lens module according to claim 1, wherein the lens holder and the base are provided with through holes corresponding to the at least one of the plurality of elastic sheets provided with the shielding sheet to reduce a temperature of the at least one of the plurality of elastic sheets. ### Claim 3 (depends on 1) The lens module according to claim 1, wherein a number of the plurality of elastic sheets is equal to or greater than three. ### Claim 4 (depends on 1) The lens module according to claim 1, wherein the plurality of elastic sheets is evenly distributed around the edge of the lens. ### Claim 5 (depends on 1) The lens module according to claim 1, wherein a number of the plurality of elastic sheets is equal to three, and positions of the plurality of elastic sheets are separated by an angle of 100-140 degrees. ### Claim 6 (depends on 5) The lens module according to claim 5, wherein the positions of the plurality of elastic sheets are separated by an angle of 120 degrees. ### Claim 7 (depends on 1) The lens module according to claim 1, wherein a material of the shielding sheet is aluminum. ### Claim 8 (depends on 1) The lens module according to claim 1, wherein each of the plurality of elastic sheets extends from the edge of the lens to an arc direction of a curved surface of the lens, and a surface of each of the plurality of elastic sheets fits the curved surface of the lens. ### Claim 9 A lens module, comprising: a lens fixing device and a base; wherein the lens fixing device, comprises: a lens holder, assembled on the base; a lens, assembled on the lens holder; a washer, disposed between the lens and the lens holder; a plurality of elastic sheets, wherein one end of each of the plurality of elastic sheets is locked on the lens holder and pressed around an edge of the lens, the other end of each of the plurality of elastic sheets extends from the edge of the lens to an arc direction of a curved surface of the lens, the other end of each of the plurality of elastic sheets does not contact the lens holder, and a surface of each of the plurality of elastic sheets fits and directly contacts the curved surface of the lens. ### Claim 10 (depends on 9) The lens module according to claim 9, wherein a material of the washer is a low thermal conductivity material. ### Claim 11 (depends on 9) The lens module according to claim 9, further comprising: a shielding sheet, arranged on at least one of the plurality of elastic sheets, and located on a transmission path of an excitation light beam to prevent the excitation light beam from directly irradiating the at least one of the plurality of elastic sheets. ### Claim 12 (depends on 9) The lens module according to claim 9, wherein the lens holder and the base are provided with through holes corresponding to the at least one of the plurality of elastic sheets provided with the shielding sheet to reduce a temperature of the at least one of the plurality of elastic sheets. ### Claim 13 (depends on 9) The lens module according to claim 9, wherein a material of the shielding sheet is aluminum. ### Claim 14 A projection device, comprising: an illumination system, configured to provide an illumination light beam; a light valve, arranged on a transmission path of the illumination light beam to convert the illumination light beam into an image light beam; and a projection lens, arranged on the transmission path of the image light beam, wherein the illumination system comprises: a light source, a lens module, and a wavelength conversion device, wherein the light source is configured to provide an excitation light beam, the lens module is arranged on a transmission path of the excitation light beam, and the wavelength conversion device is arranged on the transmission path of the excitation light beam, is configured to convert the excitation light beam into a converted light beam, and is emitted the illumination light beam including at least one of the excitation light beam and the converted light beam, wherein the lens module comprises: a lens fixing device and a base; wherein, the lens fixing device, comprises: a lens holder, assembled on the base; a lens, assembled on the lens holder and arranged on the transmission path of the excitation light beam; and a plurality of elastic sheets, locked on the lens holder and pressed around an edge of the lens; and a shielding sheet, arranged on at least one of the plurality of elastic sheets, a length of the shielding sheet in a radial direction of the lens being larger than a length of the at least one of the plurality of elastic sheets in the radial direction of the lens, wherein the lens is configured to receive the excitation light beam in a manner that a main optical axis of the excitation light beam is incident on an incident position of the lens where the incident position has an offset from a center axis of the lens, and the at least one of the plurality of elastic sheets is arranged closer to the incident position of the lens than others of the plurality of elastic sheets. ### Claim 15 (depends on 14) The projection device according to claim 14, wherein the excitation light beam directly enters the wavelength conversion device after leaving the lens module. ### Claim 16 (depends on 14) The projection device according to claim 14, wherein the lens holder and the base are provided with through holes corresponding to the at least one of the plurality of elastic sheets provided with the shielding sheet to reduce a temperature of the at least one of the plurality of elastic sheets. ### Claim 17 (depends on 14) The projection device according to claim 14, wherein each of the plurality of elastic sheets extends from the edge of the lens to an arc direction of a curved surface of the lens, and a surface of each of the plurality of elastic sheets fits the curved surface of the lens. ### Claim 18 (depends on 14) The projection device according to claim 14, wherein the lens module further comprises a washer disposed between the lens and the lens holder, a material of the washer is a low thermal conductivity material.