Toner for developing electrostatic images
US6004715A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 25, 1996 |
| Grant date | Dec 21, 1999 |
| Priority date | — |
| Expiry date | Jun 25, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/09733
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A toner for developing an electrostatic latent image, which includes ground toner particles having physical properties meeting with at least one of the following conditions (a) and (b): PA1 (a) the toner particles have an average surface roughness of at least 0.89, the average suface roughness being an average of SF1 of respective toner particles, where SF1 is defined as follows: EQU SF1=Le/Lp PA1 wherein Le and Lp represent the length of the minimum envelope line and the peripheral length of each toner particle, respectively; PA1 (b) the toner particles have an average shape index SF3 of at least 0.63, the average shape index being a product of the average of SF1 and an average of SF2, where SF1 is as defined above and SF2 is defined as follows: EQU SF2=4S/(P.sup.2 .times..pi.) PA1 wherein S and P represent the area and the maximum diameter of each toner particle, respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.