# US 5,710,616 A · Film position detecting device, film image display device and movie film recording device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,710,616 A - Document ID: US5710616A - Status: Granted - Kind: A - Application number: 08/736,604 - Filed: 1996-10-25 - Granted: 1998-01-20 - Earliest claimed: 1995-10-31 - Assignees: Sony Corporation - Inventors: Etsuro Saito; Kiyoshi Inatome - Web page: https://patentgrep.com/patent/US5710616A ## CPC - G03B 19/18: Motion-picture cameras (with non-intermittently running film G03B41/02) - G03B 21/32: Details specially adapted for motion-picture projection (with film moving continuously through the gate G03B41/02) - 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 In a first guide unit the plural number of electrodes are provided facing the edge of a movie film containing a plurality of perforations formed along the longitudinal direction of the movie film, in a second guide unit a band shaped conducting material is provided facing the electrodes having the movie film between, and each stop position with respect to window holes is detected based on the amount of change of each electrostatic capacity changing depending on the displacement rate from each stop position of a plurality of condensers which are formed making each electrode and conducting material as a pole plate respectively and making the thickness of the movie film as the distance of pole plates. Therefore, a film position detection device, a film image display device and a movie film recording device capable of further improving the movie film position detection accuracy can be realized with the simple construction. ## Claims ### Claim 1 A film position detecting device for detecting the stop position of a movie film for each intermittent forwarding when a film running device is connected with a plurality of perforations formed on said movie film in the longitudinal direction to carry said movie film intermittently, comprising: the first and second guide means for holding said movie film driven by said film running device from both sides and on which window holes for transmitting light source light or image light are formed; the plural number of electrodes provided in said first guide means facing, at least, one of the edges of said movie film containing said perforations; and a band shaped conducting material provided in said second guide means facing said electrodes having said movie film between; and position detecting means for detecting the stop position of said movie film with respect to said window holes, based on the amount of change of each electrostatic capacity of a plurality of condensers which are formed making said electrodes and said band shaped conducting material as pole plates respectively and the thickness of said movie film as the distance of said pole plates, said amount of change of electrostatic capacity changing depending on the displacement rate of the stop position of said movie film for each intermittent forwarding. ### Claim 2 (depends on 1) The film position detecting device according to claim 1, wherein: said electrodes provided in said first guide means are arranged as a pair of electrodes corresponding to two sides of the direction being at right angles to the running direction of said movie film out of four sides of the hole constituting said perforation; and said position detecting means detects the displacement rate of the stop position in the running direction of said movie film by said condensers which are formed with a pair of said electrodes and said band shaped conducting material. ### Claim 3 (depends on 2) The film position detecting device according to claim 2, wherein: said electrodes provided in said first guide means are arranged further corresponding to the edge of said movie film; and said position detecting means detects the displacement rate of the stop position in the running direction of said movie film by said condensers which are formed with a pair of said electrodes and said band shaped conducting material and detects the displacement rate of the stop position in the direction being at right angles to the running direction of said movie film by a plurality of condensers which are formed with said electrodes arranged corresponding to the edge and said band shaped conducting material. ### Claim 4 (depends on 1) The film position detecting device according to claim 1, wherein: said electrodes provided in said first guide means are arranged corresponding to the edge of said movie film; and said position detecting means detects the displacement rate of the stop position in the direction being at right angles to the running direction of said movie film by a plurality of condensers which are formed with said electrodes arranged corresponding to the edge and said band shaped conducting material. ### Claim 5 (depends on 1) The film position detecting device according to claim 1, wherein said first guide means has a face on which said multiple electrodes are provided smoothly formed in order not to produce friction on said movie film. ### Claim 6 A film image display device for carrying a movie film intermittently by connecting a film running device with a plurality of perforations formed on said movie film in the longitudinal direction and for displaying the transmitted light of said movie film to a predetermined projection object by irradiating the light source light from the light source to the fixed area of said movie film at the stop position of said movie film for each intermittent forwarding, said film image displaying device comprising: the first and second guide means for holding said movie film driven by said film running device from both sides and on which window holes for transmitting the light source light or the image light to the fixed area of said movie film are formed; the plural number of electrodes provided in said first guide means facing, at least, one of the edges of said movie film containing said perforations; a band shaped conducting material provided in said second guide means facing said electrodes having said movie film between; position detecting means for detecting the stop position of said movie film with respect to said window holes, based on the amount of change of each electrostatic capacity of a plurality of condensers which are formed making said electrodes and said band shaped conducting material as pole plates respectively and the thickness of said movie film as the distance of said pole plates, said amount of change of electrostatic capacity changing depending on the displacement rate of the stop position of said movie film for each intermittent forwarding; and optical axis correcting means, which is provided on an optical axis of the transmitted light of said movie film, for correcting an optical axis of the transmitted light of said movie film in order to control the sway of image displayed on said projection object in accordance with the output of said position detecting means. ### Claim 7 (depends on 6) The film image displaying device according to claim 6, wherein: said electrodes provided in said first guide means are arranged as a pair of electrodes corresponding to two sides of the direction being at right angles to the running direction of said movie film out of four sides of the hole constituting said perforation and are arranged further corresponding to the edge of said movie film; said position detecting means detects the displacement rate of the stop position in the running direction of said movie film by said condensers which are formed with a pair of said electrodes and said band shaped conducting material and detects the displacement rate of the stop position in the direction being at right angles to the running direction of said movie film by a plurality of condensers which are formed with said electrodes arranged corresponding to the edge and said band shaped conducting material; and said optical axis correcting means corrects an optical axis of the transmitted light of said movie film in order to control the sway in the latitudinal direction and the transverse direction of the image displayed on said predetermined projection object in accordance with the output of said position detecting means. ### Claim 8 (depends on 6) The film image display device according to claim 6, wherein: said electrodes provided in said first guide means are arranged corresponding to the edge of said movie film; said position detecting means detects the displacement rate of the stop position in the direction being at right angles to the running direction of said movie film by a plurality of condensers which are formed with said electrodes arranged corresponding to the edge and said band shaped conducting material; and said optical axis correcting means corrects an optical axis of the transmitted light of said movie film in order to control the sway in the transverse direction of the image displayed on said predetermined projection object in accordance with the output of said position detecting means. ### Claim 9 (depends on 6) The film image display device according to claim 6, wherein said first guide means has a face on which said electrodes are provided smoothly finished in order not to produce friction on said movie film. ### Claim 10 A movie film recording device for carrying a movie film intermittently by connecting a film running device with a plurality of perforations formed on said movie film in the longitudinal direction, and for recording images on said movie film based on a predetermined image light by irradiating said image light to the fixed area of said movie film at the stop position of said movie film for each intermittent forwarding, said movie film recording device comprising: the first and second guide means for holding said movie film driven by said film running device from both sides and on which window holes for transmitting the light source light or the image light to the fixed area of said movie film are formed; the plural number of electrodes provided in said first guide means facing, at least, one of the edges of said movie film containing said perforations; a band shaped conducting material provided in said second guide means facing said electrodes having said movie film between; position detecting means for detecting the stop position of said movie film with respect to said window holes, based on the amount of change of each electrostatic capacity of a plurality of condensers which are formed making said electrodes and said band shaped conducting material as pole plates respectively and the thickness of said movie film as the distance of said pole plates, said amount of change of electrostatic capacity changing depending on the displacement rate of the stop position of said movie film for each intermittent forwarding; and optical axis correcting means, which is provided on an optical axis of said predetermined image light, for correcting an optical axis of said image light in order to control the sway of image recorded on said movie film in accordance with the output of said position detecting means. ### Claim 11 (depends on 10) The movie film recording device according to claim 10, wherein: said electrodes provided in said first guide means are arranged as a pair of electrodes corresponding to two sides in the direction being at right angles to the running direction of said movie film out of four sides of the hole constituting said perforation and are arranged further corresponding to the edge of said movie film; said position detecting means detects the displacement rate of the stop position in the running direction of said movie film by said condensers which are formed with a pair of said electrodes and said band shaped conducting material and detects the displacement rate of the stop position in the direction being at right angles to the running direction of said movie film by a plurality of condensers which are formed with said electrodes arranged corresponding to the edge and said band shaped conducting material; and said optical axis correcting means corrects an optical axis of said image light to said movie film in order to control the sway in the latitudinal direction and the transverse direction of the image recorded on said movie film in accordance with the output of said position detecting means. ### Claim 12 (depends on 10) The movie film recording device according to claim 10, wherein: said electrodes provided in said first guide means are arranged corresponding to the edge of said movie film; said position detecting means detects the displacement rate of the stop position in the direction being at right angles to the running direction of said movie film by a plurality of condensers formed with said electrodes arranged corresponding to the edge and said band shaped conducting material; and said optical axis correcting means corrects an optical axis of said image light to said movie film in order to control the sway in the transverse direction of image recorded on said movie film in accordance with the output of said position detecting means. ### Claim 13 (depends on 10) The movie film recording device according to claim 10, wherein said first guide means has a face on which said electrodes are provided smoothly finished in order not to produce friction on said movie film.