# US 12,181,784 B2 · Projection lens > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,181,784 B2 - Document ID: US12181784B2 - Status: Granted - Kind: B2 - Application number: 17/241,762 - Filed: 2021-04-27 - Published: 2021-08-12 - Granted: 2024-12-31 - Earliest claimed: 2018-11-02 - Assignees: FUJIFILM Corporation - Applicants: FUJIFILM Corporation - Inventors: Yukiko Nagatoshi; Shoki Kasahara - Web page: https://patentgrep.com/patent/US12181784B2 ## CPC - G03B 21/142: {Adjusting of projection optics} - G02B 7/023: {permitting adjustment} - G02B 7/04: with mechanism for focusing or varying magnification - G02B 13/16: for use in conjunction with image converters or intensifiers {, or for use with projectors, e.g. objectives for projection TV} - G03B 21/145: {Housing details, e.g. position adjustments thereof} - G03B 21/28: Reflectors in projection beam {(in illumination beam G03B21/2066)} - 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) - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract A projection lens, which is a projection lens to be attached to a projection apparatus body having an electro-optical device, includes: a zoom optical system including a plurality of lenses; a first holding portion that is to be connected to the projection apparatus body and through which light along a first optical axis passes; and a second holding portion through which light along a second optical axis, which is bent with respect to the first optical axis, passes and that is rotatable relative to the first holding portion. The zoom optical system is held by the first holding portion. ## Claims ### Claim 1 A projection lens to be attached to a projection apparatus body having an electro-optical device, comprising: a zoom optical system including two groups of lenses; a first holding portion that is to be directly connected to the projection apparatus body and through which light along a first optical axis passes; and a second holding portion through which light along a second optical axis, which is bent with respect to the first optical axis, passes and that is rotatable relative to the first holding portion, wherein the two groups of lenses are held by the first holding portion such that one of the two groups of lenses are movable relative to the other of the two groups of lenses along the first optical axis. ### Claim 2 (depends on 1) The projection lens according to claim 1, wherein the projection lens forms an intermediate image in the projection lens and emits the intermediate image that has been formed, and wherein the zoom optical system is on an upstream side of an image forming position of the intermediate image in an optical path. ### Claim 3 (depends on 2) The projection lens according to claim 2, comprising: a focus optical system; and a third holding portion through which light along a third optical axis, which is bent with respect to the second optical axis, passes and that is rotatable relative to the second holding portion, wherein the focus optical system is held by the third holding portion. ### Claim 4 (depends on 2) The projection lens according to claim 2, wherein the second holding portion has an intermediate optical system, and wherein a diameter of a lens that constitutes the zoom optical system is smaller than a diameter of a lens that constitutes the intermediate optical system. ### Claim 5 (depends on 2) The projection lens according to claim 2, comprising: a zoom mechanism that is connected to a motor and that changes a zoom ratio of the zoom optical system by being provided with motive force of the motor. ### Claim 6 (depends on 2) The projection lens according to claim 2, comprising: an aperture stop portion provided in the first holding portion; and a first lens disposed on an upstream side of the aperture stop portion in an optical path, wherein the projection lens is movable in an in-plane direction of an attachment surface at which the projection lens is attached to the projection apparatus body, and wherein an inside diameter of the aperture stop portion is smaller than a diameter of the first lens. ### Claim 7 (depends on 1) The projection lens according to claim 1, comprising: a focus optical system; and a third holding portion through which light along a third optical axis, which is bent with respect to the second optical axis, passes and that is rotatable relative to the second holding portion, wherein the focus optical system is held by the third holding portion. ### Claim 8 (depends on 7) The projection lens according to claim 7, wherein the second holding portion has an intermediate optical system, and wherein a diameter of a lens that constitutes the zoom optical system is smaller than a diameter of a lens that constitutes the intermediate optical system. ### Claim 9 (depends on 7) The projection lens according to claim 7, comprising: a zoom mechanism that is connected to a motor and that changes a zoom ratio of the zoom optical system by being provided with motive force of the motor. ### Claim 10 (depends on 7) The projection lens according to claim 7, comprising: an aperture stop portion provided in the first holding portion; and a first lens disposed on an upstream side of the aperture stop portion in an optical path, wherein the projection lens is movable in an in-plane direction of an attachment surface at which the projection lens is attached to the projection apparatus body, and wherein an inside diameter of the aperture stop portion is smaller than a diameter of the first lens. ### Claim 11 (depends on 1) The projection lens according to claim 1, wherein the second holding portion has an intermediate optical system, and wherein a diameter of a lens that constitutes the zoom optical system is smaller than a diameter of a lens that constitutes the intermediate optical system. ### Claim 12 (depends on 11) The projection lens according to claim 11, comprising: a zoom mechanism that is connected to a motor and that changes a zoom ratio of the zoom optical system by being provided with motive force of the motor. ### Claim 13 (depends on 11) The projection lens according to claim 11, comprising: an aperture stop portion provided in the first holding portion; and a first lens disposed on an upstream side of the aperture stop portion in an optical path, wherein the projection lens is movable in an in-plane direction of an attachment surface at which the projection lens is attached to the projection apparatus body, and wherein an inside diameter of the aperture stop portion is smaller than a diameter of the first lens. ### Claim 14 (depends on 1) The projection lens according to claim 1, comprising: a zoom mechanism that is connected to a motor and that changes a zoom ratio of the zoom optical system by being provided with motive force of the motor. ### Claim 15 (depends on 14) The projection lens according to claim 14, comprising: an aperture stop portion provided in the first holding portion; and a first lens disposed on an upstream side of the aperture stop portion in an optical path, wherein the projection lens is movable in an in-plane direction of an attachment surface at which the projection lens is attached to the projection apparatus body, and wherein an inside diameter of the aperture stop portion is smaller than a diameter of the first lens. ### Claim 16 (depends on 1) The projection lens according to claim 1, comprising: an aperture stop portion provided in the first holding portion; and a first lens disposed on an upstream side of the aperture stop portion in an optical path, wherein the projection lens is movable in an in-plane direction of an attachment surface at which the projection lens is attached to the projection apparatus body, and wherein an inside diameter of the aperture stop portion is smaller than a diameter of the first lens. ### Claim 17 (depends on 16) The projection lens according to claim 16, wherein the aperture stop portion is a diaphragm lens, and wherein the zoom optical system includes the diaphragm lens. ### Claim 18 (depends on 17) The projection lens according to claim 17, comprising: an adjustment frame that holds the first lens, wherein the adjustment frame is movable relative to the first holding portion in a direction in which the first optical axis extends. ### Claim 19 (depends on 16) The projection lens according to claim 16, comprising: an adjustment frame that holds the first lens, wherein the adjustment frame is movable relative to the first holding portion in a direction in which the first optical axis extends. ### Claim 20 (depends on 1) The projection lens according to claim 1, comprising: an optical system that includes a lens and in which the lens is fixed to the second holding portion, wherein the optical system is capable of being oriented in a direction perpendicular to the first optical axis due to rotation of the second holding portion, and wherein light from the electro optical device passes through the first holding portion and the second holding portion along the first optical axis and the second optical axis, respectively.