# US 5,708,534 A · Apparatus for adjusting the projecting angle of a projection system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,708,534 A - Document ID: US5708534A - Status: Granted - Kind: A - Application number: 08/548,474 - Filed: 1995-10-26 - Granted: 1998-01-13 - Earliest claimed: 1994-10-26 - Assignees: Daewoo Electronics Co., Ltd. - Inventors: Jun-Hyun Park - Web page: https://patentgrep.com/patent/US5708534A ## CPC - H04N 9/3141: {Constructional details thereof (details not peculiar to the presence of an electronic spatial light modulator G03B21/14)} - H04N 5/74: Projection arrangements for image reproduction, e.g. using eidophor - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract Disclosed is an apparatus for adjusting the projecting angle of a projection system. A pair of tubes provided in parallel lengthwise and having supporting plates in the inner sides thereof, respectively; upper and lower facing brackets installed above and under the tubes, respectively, with a predetermined distance; device for transporting tube back and forth installed in the upper and lower brackets to transport the tubes back and forth, while moving back and forth; and device for transporting tube from side to side of which the center portion is combined with the device for transporting tube back and forth and of which the side portions are combined with the supporting plates, to transport the tubes from side to side while being widened and gathering together with respect to the center when the device for transporting tube back and forth moves, are included. The tubes can be adjusted back and forth, and from side to side simultaneously. The operation of the apparatus is advantageous. ## Claims ### Claim 1 An apparatus for adjusting the projecting angle of a projection system, said apparatus comprising: a pair of tubes provided in parallel lengthwise and having supporting plates in inner sides of said tubes, respectively; upper and lower facing brackets installed above and under said tubes, respectively, with a predetermined distance; first means for transporting the tubes back and forth, said first transporting means being installed in said upper and lower brackets to transport said tubes back and forth, while moving back and forth; and second means for transporting the tubes from side to side of which the center portion is combined with said first means and of which the side portions are combined with said supporting plates, to transport said tubes from side to side while being widened and gathering together with respect to a center line when said first means moves. ### Claim 2 (depends on 1) The apparatus for adjusting the projecting angle of a projection system as claimed in claim 1, wherein said first means comprises: a driving pulley which is provided on a rear center portion of said lower bracket and is driven by a motor; a plurality of driven pulleys which are rotatable and are provided at a front upper portion of said lower bracket and at front and rear portions of said upper bracket; feeding wire being wound between said driving pulley and said driven pulleys forming a closed circuit to be transported back and forth according to a rotational direction of said driving pulley; and a pair of upper and lower supporting arms fixed onto said feeding wire, said arms move back and forth according to a motion of said feeding wire, upper portion of said upper supporting arm is fitted into a guiding hole on said upper bracket, and a lower portion of said lower supporting arm is fitted into a guiding rail on said lower bracket. ### Claim 3 (depends on 2) The apparatus for adjusting the projecting angle of a projection system as claimed in claim 2, wherein projected portions are formed at a lower portion of said upper supporting arm and at an upper portion of said lower supporting arm, a screw tap is formed in said projected portion at a lower portion of said upper supporting arm, and a locking screw is formed on said projected portion at a upper portion of said lower supporting arm. ### Claim 4 (depends on 2) The apparatus for adjusting the projecting angle of a projection system as claimed in claim 2, wherein lengths of said guiding hole and said guiding rail are the same with or longer than a moving distance of said tubes back and forth. ### Claim 5 (depends on 1) The apparatus for adjusting the projecting angle of a projection system as claimed in claim 1, wherein said second means is obtained by cross combining a pair of guiding plates for transporting the tubes from side to side which comprises: supporting arm inserting holes with a predetermined height in a center portion of said guiding plates for transporting the tubes from side to side; guiding pins projected from front lower portions of said guiding plates for transporting the tubes from side to side and inserted into tracking grooves formed on front portions of said lower bracket through leading longitudinal holes formed at front lower portions of folded sides of said supporting plates; and fixing pins projected from rear portions of said guiding plates for transporting the tubes from side to side and inserted into pin inserting holes formed on said folded sides of said supporting plates. ### Claim 6 (depends on 5) The apparatus for adjusting the projecting angle of a projection system as claimed in claim 5, wherein said first means and said second means are combined by inserting projected portions of said supporting arms into said supporting arm inserting holes. ### Claim 7 An apparatus for adjusting the projecting angle of a projection system comprising: A) a pair of tubes provided in parallel lengthwise and having supporting plates in the inner sides thereof, respectively; B) upper and lower facing brackets installed above and under said tubes, respectively, with a predetermined distance; C) first means for transporting the tubes back and forth installed in said upper and lower brackets to transport said tubes back and forth, while moving back and forth, said first transporting means comprising 1) a driving pulley which is provided on a rear center portion of said lower bracket and is driven by a motor 2) a plurality of driven pulleys which are rotatable and are provided at a front upper portion of said lower bracket and at front and rear portions of said upper bracket 3) feeding wire being wound between said driving pulley and said driven pulleys forming a closed circuit to be transported back and forth according to a rotational direction of said driving pulley and 4) a pair of upper and lower supporting arms fixed onto said feeding wire, said arms move back and forth according to a motion of said feeding wire, upper portion of said upper supporting arm is fitted into a guiding hole on said upper bracket, and lower portion of said lower supporting arm is fitted into a guiding rail on said lower bracket, projected portions are formed at the lower portion of said upper supporting arm and at the upper portion of said lower supporting arm, a screw tap is formed in said projected portion at a lower portion of said upper supporting arm, and a locking screw is formed on said projected portion at an upper portion of said lower supporting arm, and the lengths of said guiding hole and said guiding rail are the same with or longer than the moving distance of said tubes back and forth; and D) second means for transporting the tubes tube from side to side of which center portion is combined with said first means by inserting projected portions of said supporting arms into said supporting arm inserting holes, and of which side portions are combined with said supporting plates, to transport said tubes from side to side while being widened and gathering together with respect to a center line when said fist means moves, said second means is obtained by cross combining a pair of guiding plates for transporting the tubes from side to side, which comprises: supporting arm inserting holes with a predetermined height in a center portion of said guiding plates for transporting the tubes from side to side; guiding pins projected from a front lower portions of said guiding plates for transporting the tubes from side to side and inserted into tracking grooves formed on front portions of said lower bracket through leading longitudinal holes formed at front lower portions of folded sides of said supporting plates; and fixing pins projected from a rear portions of said guiding plates for transporting the tubes from side to side and inserted into pin inserting holes formed on said folded sides of said supporting plates.