US Patent Application 18319289. LIGHT-EMITTING DEVICE AND IMAGE FORMING APPARATUS simplified abstract

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LIGHT-EMITTING DEVICE AND IMAGE FORMING APPARATUS

Organization Name

CANON KABUSHIKI KAISHA==Inventor(s)==

[[Category:DAISUKE Akagi of Tokyo (JP)]]

LIGHT-EMITTING DEVICE AND IMAGE FORMING APPARATUS - A simplified explanation of the abstract

This abstract first appeared for US patent application 18319289 titled 'LIGHT-EMITTING DEVICE AND IMAGE FORMING APPARATUS

Simplified Explanation

The patent application describes an image forming apparatus that includes a light-emitting chip, a substrate, a controller, and a switch.

  • The light-emitting chip emits light to expose a photosensitive drum surface based on a driving current supplied to it.
  • The controller controls the driving portion of the light-emitting chip by transmitting a signal and outputs a digital signal corresponding to the desired amount of light.
  • The switch can switch between two states: one where a voltage source supplies a reference voltage to a D/A converter, and another where the electrical connection between the voltage source and the D/A converter is disconnected.


Original Abstract Submitted

An image forming apparatus includes a light-emitting chip, a substrate on which a plurality of light emitting chips are mounted, a controller, and a switch. The light-emitting chip includes a light-emitting portion, which emits light exposing a photosensitive drum surface based on supply of a driving current to the light-emitting portion, and a driving portion that drives the light-emitting portion. The controller controls the driving portion by transmitting a signal to the light-emitting chip and outputs a digital signal corresponding to a target amount of light of the light-emitting portion to the light-emitting chip. Based on a control signal from the controller, the switch switches a connection state between the voltage source and the D/A converter to a first state where the voltage source supplies the reference voltage to the D/A converter, and a second state where an electrical connection between the voltage source and the D/A converter is disconnected.

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