Samsung Electronics Co., Ltd.

Sindoricoh Co., Ltd.

Han Sang Oh

Byoung Bag Lee

Gil K Youn

An image forming apparatus to detect the toner density of a patch pattern formed on a photosensitive medium or a transfer belt without a deviation in light intensity includes a density sensor including a light emitter to scan light onto at least one patch pattern formed as a toner image and a light receiver to receive light reflected from the at least one patch pattern and convert the received light to an electrical signal, a switch to turn on or off the light emitter, and a controller to maintain light intensity of the light emitter within a reference range by controlling on-time and off-time of the switch.

Image forming apparatus and method to detect toner thereof

A method for controlling an automatic discharge of a paper jammed in a copy machine, capable of eliminating a requirement for a user to directly remove the jammed paper. The method provides provides three jam removal modes, that is, an automatic jam removal mode for performing automatic try for removal of jam, a semi-automatic jam removal mode for performing a try for removal of jam when the user presses down the copying start key, and a manual jam removal mode for stopping the copy machine upon generation of jam, as in existing copy machines, thereby preventing deterioration of driving parts of the copy machine such as abrasion of rollers caused by forced discharge of the jammed paper, enabling the user to directly remove without opening a door of the copy machine while minimizing contamination of development and fixture parts of the copy machine and damage of driving parts of the copy machine, and capable of displaying signs indicative of a jam removing state and a manual removal of jammed papers, thereby enabling the user to recognize the state of the copy machine, and thereby obtaining a convenience in use.

Growing community of inventors

Seoul, South Korea

Han Sang Oh