Browse Prior Art Database

Fold Mirror Mounting

IP.com Disclosure Number: IPCOM000044439D
Original Publication Date: 1984-Dec-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Higgins, RC: AUTHOR [+2]

Abstract

In a laser printhead, especially one which discharges the background, it is critical that the light reflected from the fold mirror onto the photoconductor surface remain accurately in one place scan after scan on the drum surface. If any movement in the beam occurs, a very objectionable nonuniform discharge of the background results. This appears as a print quality defect which looks like vertical stripes in the background regions of a print. A fold mirror mounting that does not allow the fold mirror to rotate in response to vibrational input from the drive system and spindle of a laser printhead is shown in the figure. The system consists of a casting 15 which supports a front surface mirror 16, and clamps 11 and 12 which secure the casting to a laser printhead 17.

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Fold Mirror Mounting

In a laser printhead, especially one which discharges the background, it is critical that the light reflected from the fold mirror onto the photoconductor surface remain accurately in one place scan after scan on the drum surface. If any movement in the beam occurs, a very objectionable nonuniform discharge of the background results. This appears as a print quality defect which looks like vertical stripes in the background regions of a print. A fold mirror mounting that does not allow the fold mirror to rotate in response to vibrational input from the drive system and spindle of a laser printhead is shown in the figure. The system consists of a casting 15 which supports a front surface mirror 16, and clamps 11 and 12 which secure the casting to a laser printhead 17. The center of mass 14 of the support and mirror system is placed in line with the axis 18 of the mounting. This insures that all vibrational forces act through the center of mass axis 14 which prevents the mounting from rotating. The mounting provides the capability to adjust the scan location and skew, that is, change the scan height and angle along the photoconductor surface. The scan location is adjusted by rotating the mirror/ casting assembly along axis 18 with a tool inserted in opening
10. The skew of the scan is adjusted by translation of one of the clamps 11 and 12 along its interface with printhead 17.

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