Electrophoretic imaging method employing a periodic electric field专利检索-脉冲电场电场物理专利检索查询-专利查询网

Electrophoretic imaging method employing a periodic electric field

阅读：391发布：2023-08-10

专利汇可以提供Electrophoretic imaging method employing a periodic electric field专利检索，专利查询，专利分析的服务。并且Method and apparatus for improving image density, contrast and quality and photographic speed in an electrophoretic imaging system utilizing a particulate suspension for forming the image. The method and apparatus stress a thin layer of the electrophoretic suspension of particles in a carrier on an electrode during imaging by applying a high frequency pulsed or varying electric field across the imaging suspension.，下面是Electrophoretic imaging method employing a periodic electric field专利的具体信息内容。

权利要求

2. The method of claim 1 wherein the steps of exposing and periodic applying of an electric field occur simultaneously and the frequency of the periodic application of the field is at a rate such that the field is applied when the electrodes are in contact with the suspension at contiguous portions thereof.

3. The method of claim 1 wherein application of the field is such that the period is cyclic and the wave form approximates a square wave.

4. The method of claim 1 wherein the application of the field is such that the period is cyclic and the wave form thereof is at least a portion of a sine wave.

5. The method of claim 3 or 4 wherein the duty time of the cycle is 50 percent of the cycle time.

6. The method of claim 3 or 4 wherein the duty time of the cycle is less than 50 percent of the cycle time.

7. The method of claim 3 or 4 wherein the duty time of the cycle is greater than 50 percent of the cycle.

8. In a method for imaging electrophoretic particle suspensions having a first electrode adapted to support an image formed from the suspension, at least another electrode for contacting the suspension such that it is maintained between said electrodes, including applying an electric field across the suspension between the first and the other electrodes, and exposing the suspension to an image with activating electromagnetic radiation the improvement including periodically varying the electric field across the suspension, said variation being of such a direction and amplitude as to remain above the threshold potential for forming an image electrophoretically.

9. The method of claim 8 wherein said periodic varying of potential is of a constant frequency.

10. The method of claim 8 wherein said periodic varying potential has a constant peak amplitude.

11. The method of claim 8 wherein said periodic varying potential includes a positive and negative amplitude.

12. The method of claim 8 wherein said periodic varying potential includes a rectified amplitude having a potential substantially only in a direction additive to the applied electric field.

13. The method of claim 8 wherein the frequency of the periodic varied field is capable of itself being varied.

14. The method of claim 9 wherein the frequency is such that its effect on the image is greater than five line pairs per millimeter.

15. The method of claim 1 including causing relative movement at a predetermined velocity between the first electrode and the other electrode.

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Electrophoretic imaging method employing a periodic electric field

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