# US 7,417,653 B2 · Electrostatic latent image forming medium using optical shutter array and image forming apparatus having the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,417,653 B2 - Document ID: US7417653B2 - Status: Granted - Kind: B2 - Application number: 11/251,805 - Filed: 2005-10-18 - Published: 2006-04-20 - Granted: 2008-08-26 - Earliest claimed: 2004-10-18 - Assignees: Samsung Electronics Co., Ltd. - Inventors: Gee-young Sung; Seong-jin Kim; Seung-joo Shin; Kye-si Kwon - Web page: https://patentgrep.com/patent/US7417653B2 ## CPC - G03G 15/751: {relating to drum (G03G15/757 takes precedence)} - G03G 15/0435: {by introducing an optical element in the optical path, e.g. a filter} - G03G 2215/017: single rotation of recording member to produce multicoloured copy - G03G 2215/0497: Exposure from behind the image carrying surface - G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY ## Abstract An image forming apparatus includes an electrostatic latent image forming medium, a charge unit charging the surface of the electrostatic latent image forming medium with a predetermined potential, a toner supply unit (TSU) supplying toner to an electrostatic latent image formed on the surface of the electrostatic latent image forming medium to develop the electrostatic latent image into a toner image, and a transfer unit transferring the toner image to a print medium, the electrostatic latent image forming medium including a transparent frame member, a light source inside the frame member, an optical shutter array including a plurality of optical shutters, and a photoconductive layer on which the electrostatic latent image is formed using light transmitted through the optical shutter array. A diffuser may surround the light source to diffuse light to maintain the intensity of light reaching the optical shutters at a uniform level. ## Claims ### Claim 1 An electrostatic latent image forming medium of an image forming apparatus, the electrostatic latent image forming medium comprising: a transparent frame member; at least one light source disposed inside the transparent frame member; an optical shutter array on an outer surface of the transparent frame member and including a plurality of optical shutters that selectively transmit light emitted from the at least one light source; and a photoconductive layer on the optical shutter array, wherein an electrostatic latent image is formed on the photoconductive layer using light transmitted through the optical shutter array. ### Claim 2 (depends on 1) The electrostatic latent image forming medium as claimed in claim 1, wherein the optical shutter array and the photoconductive layer are sequentially stacked on the outer surface of the transparent frame member, the electrostatic latent image forming medium further comprising a transparent electrode formed on an outer surface or an inner surface of the optical shutter array and adapted to drive the plurality of optical shutters. ### Claim 3 (depends on 1) The electrostatic latent image forming medium as claimed in claim 1, further comprising a diffuser surrounding the light source and diffusing light emitted from the light source to maintain the intensity of light reaching the plurality of optical shutters at a uniform level. ### Claim 4 (depends on 3) The electrostatic latent image forming medium as claimed in claim 3, wherein the light source is a line light source. ### Claim 5 (depends on 3) The electrostatic latent image forming medium as claimed in claim 3, wherein the light source includes a plurality of light sources. ### Claim 6 (depends on 5) The electrostatic latent image forming medium as claimed in claim 5, wherein the plurality of light sources is arranged in a radial pattern at predetermined intervals. ### Claim 7 (depends on 5) The electrostatic latent image forming medium as claimed in claim 5, wherein each of the plurality of light sources is surrounded by one of a corresponding plurality of diffusers. ### Claim 8 (depends on 5) The electrostatic latent image forming medium as claimed in claim 5, wherein the diffuser surrounds all of the plurality of light sources. ### Claim 9 (depends on 1) The electrostatic latent image forming medium as claimed in claim 1, further comprising a micro-lens array including a plurality of focusing lenses that focus light emitted from the light source to the respective optical shutters. ### Claim 10 (depends on 9) The electrostatic latent image forming medium as claimed in claim 9, wherein the micro-lens array is integrally formed with the transparent frame member. ### Claim 11 (depends on 1) The electrostatic latent image forming medium as claimed in claim 1, wherein the optical shutter array is flexible such that it can be wound around an outer circumferential surface of the transparent frame member. ### Claim 12 An image forming apparatus, comprising: an electrostatic latent image forming medium on a surface of which an electrostatic latent image is formed; a charge unit charging the surface of the electrostatic latent image forming medium with a predetermined potential; a toner supply unit (TSU) supplying toner to the electrostatic latent image formed on the surface of the electrostatic latent image forming medium to develop the electrostatic latent image into a toner image; and a transfer unit transferring the toner image to a print medium, wherein the electrostatic latent image forming medium includes: a transparent frame member; at least one light source disposed inside the transparent frame member; an optical shutter array on an outer surface of the transparent frame member and including a plurality of optical shutters that selectively transmit light emitted from the at least one light source; and a photoconductive layer on the optical shutter array, wherein an electrostatic latent image is formed on the photoconductive layer using light transmitted through the optical shutter array. ### Claim 13 (depends on 12) The image forming apparatus as claimed in claim 12, wherein the optical shutter array and the photoconductive layer are sequentially stacked on the outer surface of the transparent frame member, the electrostatic latent image forming medium further comprising a transparent electrode formed on an outer surface or an inner surface of the optical shutter array and adapted to drive the plurality of optical shutters. ### Claim 14 (depends on 12) The image forming apparatus as claimed in claim 12, wherein the electrostatic latent image forming medium further comprises a diffuser surrounding the light source and diffusing light emitted from the light source to maintain the intensity of light reaching the plurality of optical shutters at a uniform level. ### Claim 15 (depends on 14) The image forming apparatus as claimed in claim 14, wherein the light source is a line light source. ### Claim 16 (depends on 14) The image forming apparatus as claimed in claim 14, wherein the light source includes a plurality of light sources. ### Claim 17 (depends on 16) The image forming apparatus as claimed in claim 16, wherein the plurality of light sources is arranged in a radial pattern at predetermined intervals. ### Claim 18 (depends on 16) The image forming apparatus as claimed in claim 16, wherein each of the plurality of light sources is surrounded by one of a corresponding plurality of diffusers. ### Claim 19 (depends on 16) The image forming apparatus as claimed in claim 16, wherein the diffuser surrounds all of the plurality of light sources. ### Claim 20 (depends on 12) The image forming apparatus as claimed in claim 12, wherein the electrostatic latent image forming medium further comprises a micro-lens array including a plurality of focusing lenses that focus light emitted from the light source to the respective optical shutters. ### Claim 21 (depends on 20) The image forming apparatus as claimed in claim 20, wherein the micro-lens array is integrally formed with the transparent frame member. ### Claim 22 (depends on 12) The image forming apparatus as claimed in claim 12, wherein the optical shutter array is flexible such that it can be wound around an outer surface of the transparent frame member. ### Claim 23 (depends on 12) The image forming apparatus as claimed in claim 12, further comprising a potential eliminating unit eliminating the potential on the surface of the electrostatic latent image forming medium.