# US 10,871,705 B2 · Projection device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,871,705 B2 - Document ID: US10871705B2 - Status: Granted - Kind: B2 - Application number: 16/881,001 - Filed: 2020-05-22 - Published: 2020-11-26 - Granted: 2020-12-22 - Earliest claimed: 2019-05-24 - Assignees: Coretronic Corporation - Applicants: Coretronic Corporation - Inventors: Wei-Hao Chen; Shu-Yu Lin; Chia-Ching Tso - Web page: https://patentgrep.com/patent/US10871705B2 ## CPC - G03B 21/142: {Adjusting of projection optics} - H04N 9/3188: {Scale or resolution adjustment (scaling in general G06T3/40; resolution modifying circuits for displays in general G09G5/391)} - G03B 21/003: {Cine-projectors} - G03B 21/14: Details - G03B 21/28: Reflectors in projection beam {(in illumination beam G03B21/2066)} - H04N 9/3102: {using two-dimensional electronic spatial light modulators (micromechanical modulators as such G02B26/0833; liquid crystal modulators as such G02F1/13)} - H04N 9/317: {Convergence or focusing systems (electronic adjustment of convergence H04N9/3185; convergence or focusing arrangements for cathode ray tubes H04N9/28; means for automatic focusing of projectors not peculiar to the presence of an electronic spatial light modulator G03B21/53)} - G09G 3/001: {using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background (slide projectors per se G03B23/00 = 42 HP)} - G09G 3/007: {Use of pixel shift techniques, e.g. by mechanical shift of the physical pixels or by optical shift of the perceived pixels} - 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) - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00) ## Abstract The invention provides a projection device, comprising an illumination system, a light valve, a light guide element, an optical module and a projection lens. The optical module comprises a fixed portion, a first frame body, at least one first driving element and an optical element. The first frame body is pivoted to the fixed portion and comprises a first side and other three second sides. The first driving element is configured on at least one of the other three second sides and configured to drive the first frame body to oscillate back and forth. A first virtual plane of the projection lens intersects with a second virtual plane of the light valve to form a virtual line segment. The distance between the first side and the virtual line segment is shorter than the distance between the other three second sides and the virtual line segment. ## Claims ### Claim 1 A projection device, comprises: an illumination system, configured to provide an illumination beam; a light valve, configured on the transmission path of the illumination beam and configured to convert the illumination beam into an image beam; a light guide element, configured on the transmission path of the image beam and located between the illumination system and the light valve; an optical module, configured on the transmission path of the image beam, and the optical module comprises: a fixed portion; a first frame body, pivoted to the fixed portion, wherein the first frame body comprises a first side and other three second sides; at least one first driving element, configured on at least one of the other three second sides of the first frame body and configured to drive the first frame body to oscillate back and forth; and an optical element, configured in the first frame body and configured to allow the image beam to pass; and a projection lens, configured on the transmission path of the image beam and configured to convert the image beam into a projection beam, wherein a first virtual plane of the projection lens intersects with a second virtual plane of the light valve to form a virtual line segment, wherein the distance between the first side of the first frame body and the virtual line segment is shorter than the distance between the other three second sides of the first frame body and the virtual line segment, and when oscillating, the optical element oscillates with the first frame body to enable the transmission path of the image beam to produce a displacement in a first direction. ### Claim 2 (depends on 1) The projection device according to claim 1, wherein the optical module is located between the light guide element and the light valve, and the at least one first driving element is located on the side, far away from the projection lens, in the optical module. ### Claim 3 (depends on 1) The projection device according to claim 1, wherein the optical module is located between the light guide element and the projection lens, and the at least one first driving element is located on the side, far away from the light valve, in the optical module. ### Claim 4 (depends on 1) The projection device according to claim 1, wherein the at least one first driving element comprises a magnet and a coil. ### Claim 5 (depends on 1) The projection device according to claim 1, wherein the first frame body oscillates around a first rotation axis, and the first rotation axis is non-orthogonal and non-parallel to any side of the first frame body. ### Claim 6 (depends on 1) The projection device according to claim 1, wherein the optical element is embedded into the inner surface of the first frame body. ### Claim 7 (depends on 1) The projection device according to claim 1, wherein the optical module further comprises a second frame body and at least one second driving element, wherein, the second frame body is configured in the first frame body; the at least one second driving element is configured on the second frame body, wherein the at least one second driving element is configured to drive the second frame body to oscillate back and forth, when oscillating, the optical element oscillates with the second frame body to enable the transmission path of the image beam to produce a displacement in a second direction, and the second direction is non-parallel to the first direction. ### Claim 8 (depends on 7) The projection device according to claim 7, wherein the at least one first driving element and the at least one second driving element comprise a magnet and a coil. ### Claim 9 (depends on 7) The projection device according to claim 7, wherein the first frame body oscillates around a first rotation axis, the second frame body oscillates around a second rotation axis, and the first rotation axis is non-parallel to the second rotation axis. ### Claim 10 (depends on 7) The projection device according to claim 7, wherein the optical element is embedded into the inner surface of the second frame body. ### Claim 11 (depends on 1) The projection device according to claim 1, wherein the diagonal length of the light valve is smaller than or equal to 0.33 inch. ### Claim 12 (depends on 1) The projection device according to claim 1, wherein the length of a long side in the optical element is smaller than or equal to 30 mm. ### Claim 13 (depends on 1) The projection device according to claim 1, wherein the shortest light path length from the light valve through the light guide element to the projection lens is smaller than or equal to 50 mm. ### Claim 14 (depends on 1) The projection device according to claim 1, wherein the optical axis direction of the projection lens is perpendicular to the normal direction of the light valve.