公开(公告)号：US5914871A

公开(公告)日：1999-06-22

申请号：US115525

申请日：1998-07-13

Applicant: John Lin ,  Ching Chang Lin

Inventor： John Lin ,  Ching Chang Lin

IPC: H05B41/38 ,  H05B41/40 ,  H02M7/537 ,  H05B37/02

CPC classification number: H05B41/386 ,  H05B41/40

Abstract: A device for controlling the illuminance of a light source in order to quickly warm up the light source to a certain brightness for a scanning operation is disclosed. The device allows multi-stages of current to be provided for the light source by adjusting a capacitance therein. For a two-stage illuminance control before scanning operations, a current having an intensity greater than required for the normal scanning operation is provided for the light source to excite the brightness of the light source to exceed the certain brightness required for the scanning operation in the first stage, and a current for generating the desired brightness for the scanning operation substitutes for the exciting current to be provided for the light source in the second stage. Thereafter, the scanning operation is performed after a short period of brightness stabilization.

Abstract translation: 公开了一种用于控制光源的照度以便将光源快速预热到用于扫描操作的特定亮度的装置。 该装置允许通过调节其中的电容来为光源提供多级电流。 对于扫描操作之前的两级照度控制，为光源提供具有大于正常扫描操作所需的强度的电流，以激发光源的亮度超过扫描操作所需的一定亮度 第一级，并且用于产生用于扫描操作的期望亮度的电流代替在第二级中为光源提供的激励电流。 此后，在短时间的亮度稳定之后执行扫描操作。