Exposure apparatus for copying machines
AssigneeTokyo Shibaura Denki Kabushiki Kaisha
InventorMitsuaki Kohyama
Life of this patent
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Abstract
An exposure apparatus for copying machines comprises a light guiding unit having a variable aperture for guiding a light image through the aperture and onto a photoconductive drum. The light guiding unit comprises a thermally metamorphic member positioned near the drum and operatively connected to the variable aperture for controlling the size of the aperture as a function of the temperature of the photoconductive drum.
Claims5
In an electrostatic copying machine having a photoconductive member, charge means for applying a uniform electrostic charge to the photoconductive member, exposure means for exposing the charged photoconductive member to a light image and producing an electrostatic latent image on the photoconductive member, and developer means for developing the electrostatic latent image, said exposure means comprising:
- a light guiding means for guiding said light image onto said photoconductive member, said light guiding means including a variable aperture means having at least one movable element for varying the amount of light reaching said photoconductive member,
- said light guiding means further comprising a thermally metamorphic member positioned near said photoconductive member and attached to said movable element and capable of undergoing physical displacement upon exposure to changes in temperature of said photoconductive member, whereby said movable element undergoes displacement to vary the amount of said light as a function of temperature of the photoconductive member.
Dependencies are inferred from the claim text.