| 摘要 |
<p>A toner density estimating method for a two-component developer is provided. The toner density estimating method includes sensing photo-reflectance of a test pattern having a plurality of grayscales formed by using toner; calculating a rate of change of the photo-reflectance according to the grayscales of the test pattern; and estimating a toner density based on the rate of change. As the toner density estimate is based on a relative value, i.e. the rate of change, rather than an measurement of absolute photo-reflectance, it is possible to accurately estimate the toner density irrespective of the influence of changes in temperature, humidity or other external factors.</p> |
