# US 7,611,249 B2 · Projector > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,611,249 B2 - Document ID: US7611249B2 - Status: Granted - Kind: B2 - Application number: 11/312,361 - Filed: 2005-12-21 - Published: 2006-06-22 - Granted: 2009-11-03 - Earliest claimed: 2004-12-22 - Assignees: LG Electronics Inc. - Inventors: Nam Sik Kim - Web page: https://patentgrep.com/patent/US7611249B2 ## CPC - G02B 26/0875: {by means of one or more refracting elements} - G02B 13/16: for use in conjunction with image converters or intensifiers {, or for use with projectors, e.g. objectives for projection TV} - G02B 26/0816: {by means of one or more reflecting elements} - G03B 21/28: Reflectors in projection beam {(in illumination beam G03B21/2066)} - H04N 5/7416: {involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal} - H04N 9/3111: {for displaying the colours sequentially, e.g. by using sequentially activated light sources (sequential projection in colour photography G03B33/08)} - H04N 9/3141: {Constructional details thereof (details not peculiar to the presence of an electronic spatial light modulator G03B21/14)} - 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)} - 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) - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract A projector including a shiftable projection lens unit is disclosed. The projector includes an illumination unit adapted to emit generated light, a micro device adapted to receive the light from the illumination unit, and to produce an image using the received light, a projection lens unit adapted to emit the image produced by the micro device, a reflector arranged at a downstream end of the projection lens unit, and adapted to change a direction of the light incident from the projection lens unit on the reflector such that the image is externally emitted, and a driving unit adapted to shift the projection lens unit and the reflector, thereby adjusting an emission direction of the externally-emitted image. ## Claims ### Claim 1 A projector comprising: an illumination unit adapted to emit generated light; a micro device adapted to receive the light from the illumination unit, and to produce an image using the received light; a projection lens unit adapted to emit the image produced by the micro device; a reflector arranged at a downstream end of the projection lens unit, and adapted to change a direction of the light incident from the projection lens unit on the reflector such that the image is externally emitted; and a driving unit adapted to shift the projection lens unit and the reflector, thereby adjusting an emission direction of the externally-emitted image. ### Claim 2 (depends on 1) The projector according to claim 1, wherein the micro device is a liquid crystal display (LCD) panel, a liquid crystal on silicon (LCOS) panel, or a digital micromirror device (DMD) panel. ### Claim 3 (depends on 1) The projector according to claim 1, wherein the projection lens unit includes: a master lens set adapted to emit light carrying the produced image; a compensation lens set adapted to compensate light emitted from the master lens set; a zoom lens set adapted to adjust a focal length of light emitted from the compensation lens set; and a focus adjusting lens set adapted to adjust a focus of light emitted from the zoom lens set. ### Claim 4 (depends on 3) The projector according to claim 3, wherein the master lens set, the compensation lens set, the zoom lens set, and the focus adjusting lens set are arranged in an aligned manner in parallel to a central axis of light incident on the projection lens unit. ### Claim 5 (depends on 3) The projector according to claim 3, wherein the zoom lens set is shiftable in a direction parallel to the central axis of the incident light, to adjust the focus of the image. ### Claim 6 (depends on 3) The projector according to claim 3, wherein the focus adjusting lens set is shiftable in a direction parallel to the central axis of the incident light, to adjust the focal length of the image. ### Claim 7 (depends on 1) The projector according to claim 1, wherein the reflector includes a fully-reflective mirror or a prism. ### Claim 8 (depends on 1) The projector according to claim 1, wherein the projection lens unit and the reflector are integrated such that the projection lens unit and the reflector are simultaneously shiftable by the driving unit. ### Claim 9 (depends on 8) The projector according to claim 8, wherein the projection lens unit and the reflector have the same shift direction and the same shift distance. ### Claim 10 (depends on 1) The projector according to claim 1, wherein the projection lens unit and the reflector are separate from each other such that the projection lens unit and the reflector are independently shiftable by the driving unit. ### Claim 11 (depends on 10) The projector according to claim 10, wherein the projection lens unit and the reflector have different shift directions and different shift distances, respectively. ### Claim 12 (depends on 1) The projector according to claim 1, wherein the projection lens unit and the reflector are shiftable in a direction perpendicular to a central axis of light incident on the projection lens unit. ### Claim 13 (depends on 1) The projector according to claim 1, wherein the driving unit is mechanically or electrically controlled. ### Claim 14 (depends on 1) The projector according to claim 1, further comprising: a controller adapted to control the driving unit. ### Claim 15 A projector comprising: an illumination unit adapted to emit generated light; a micro device adapted to receive the light from the illumination unit, and to produce an image using the received light; a projection lens unit adapted to emit the image produced by the micro device; a reflector arranged at a downstream end of the projection lens unit, and integrated with the projection lens unit, the reflector being adapted to change a direction of the light incident from the projection lens unit on the reflector such that the image is externally emitted; and a driving unit adapted to simultaneously shift the projection lens unit and the reflector, thereby adjusting an emission direction of the externally-emitted image. ### Claim 16 (depends on 14) The projector according to claim 14, wherein the projection lens unit and the reflector have the same shift direction and the same shift distance. ### Claim 17 (depends on 14) The projector according to claim 14, wherein the projection lens unit and the reflector are shiftable in a direction perpendicular to a central axis of light incident on the projection lens unit. ### Claim 18 A projector comprising: an illumination unit adapted to emit generated light; a micro device adapted to receive the light from the illumination unit, and to produce an image using the received light; a projection lens unit adapted to emit the image produced by the micro device; a reflector arranged at a downstream end of the projection lens unit, and adapted to change a direction of the light incident from the projection lens unit on the reflector such that the image is externally emitted; a first driving unit adapted to shift the projection lens unit in a predetermined direction; a second driving unit adapted to shift the reflector in a predetermined direction; and a controller adapted to control the first and second driving units. ### Claim 19 (depends on 18) The projector according to claim 18, wherein the projection lens unit and the reflector have different shift directions and different shift distances, respectively. ### Claim 20 (depends on 18) The projector according to claim 18, wherein the projection lens unit and the reflector are shiftable in a direction perpendicular to a central axis of light incident on the projection lens unit. ### Claim 21 (depends on 1) The projector according to claim 1, wherein the reflector and the projection lens unit are arranged in a straight line to a central axis of light incident emitted from the micro device, and the reflector is located between the projection lens unit and a screen and emits the light incident to the screen. ### Claim 22 (depends on 15) The projector according to claim 15, wherein the reflector and the projection lens unit are arranged in a straight line to a central axis of light incident emitted from the micro device, and the reflector is located between the projection lens unit and a screen and emits the light incident to the screen. ### Claim 23 (depends on 18) The projector according to claim 18, wherein the reflector and the projection lens unit are arranged in a straight line to a central axis of light incident emitted from the micro device, and the reflector is located between the projection lens unit and a screen and emits the light incident to the screen.