Optical printer head and image forming apparatus
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United States of America Patent
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Aug 26, 2014
Grant Date -
Aug 31, 2006
app pub date -
Feb 27, 2006
filing date -
Feb 28, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
An optical printer head has an array of lenses that project light emitted by an array of LEDs onto a charged photosensitive drum to form a latent image on the drum surface. A resin film adhered to the exposed surfaces of the lenses prevents chemical reaction between nitric acid, formed as a consequence of ozone produced during electric charging of the photosensitive drum, and alkali components on the surfaces of the lenses thereby preventing clouding of the lens surfaces and dimming of the projected light. The resin film has a thickness of 10 to 100 microns and may be formed of polyvinyl chloride, polyethylene terephthalate or polymethyl meta acrylate.
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