Patent ID: 7283775
Filing Date: 2007-10-16
Classification: G03G

Abstract:
1. A developing device which comprises charging means for charging a target material, wherein said target material as charged by said charging means is supplied onto an electrostatic latent image to develop said electrostatic latent image into a toner image, characterized in that: said charging means comprises: light irradiation means for irradiating light; and photoelectron emission means, provided between said light irradiation means and said target material, for emitting photoelectrons when receiving light irradiated from said light irradiation means, wherein a through-type aperture is formed through said photoelectron emission means from the side of said light irradiation means to the side of said target material; and said through-type aperture is shaped to have its inner surface curved convexly to be widened outwardly to the side of said light irradiation means, and photoelectrons are emitted from the inner surface when receiving light from said light irradiation means.