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Internal Printhead Arrangement For Electrophotographic Based Printer

IP.com Disclosure Number: IPCOM000052094D
Original Publication Date: 1981-Apr-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Eaton, JH: AUTHOR

Abstract

A print station is described which has a radiation-sensitive medium on the outside of a transparent drum and an energy emitter inside the drum which moves along the axis of the drum and rotates with respect to the drum so as to "write" on the medium. There may be a plurality of emitters, and the radiation may be coupled to the medium from a stationary source by means of an axially-located rotating mirror.

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Internal Printhead Arrangement For Electrophotographic Based Printer

A print station is described which has a radiation-sensitive medium on the outside of a transparent drum and an energy emitter inside the drum which moves along the axis of the drum and rotates with respect to the drum so as to "write" on the medium. There may be a plurality of emitters, and the radiation may be coupled to the medium from a stationary source by means of an axially- located rotating mirror.

Referring to Fig. 1, photoconductor layer 10 is wrapped around or deposited on a transparent drum 12, so that the photoconductor 10 may be exposed through the drum 12 at selected position 14 to the image of light source 16. Light source 16 and appropriate imaging lens(es) 18 mounted in cylinder 20 rotate with respect to drum 12. Assembly 16, 18, 20 furthermore may be caused to move along the axis of drum 12. By moving along the axis of drum 12 one diameter of the image spot per revolution of the assembly 16, 18, 20, the entire area of photoconductor layer 10 can be exposed. With suitable modulation of light source 16, any desired pattern of exposure can be achieved within the limits of resolution of the light spot.

An array of independently modulated light sources could replace the light source 16 with appropriate change in axial movement per revolution to achieve exposure of the entire photoconductor layer. The array could be arranged either axially or circumferentially. It is possible to keep the drum stationary by moving the light spot(s). If a portion of the surface of drum 12 is blocked by electrophotographic processin...