US 5,328,791 AGranted

Dry type developer utilized in image recording apparatus

AssigneeBrother Kogyo Kabushiki Kaisha

InventorMitsuru Ohta

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Abstract

Disclosed is a dry type developer including colored particles which are flown to a recording medium, thereby an image being recorded on the recording medium, wherein, a ratio of both an average particle size of the particles calculated based on volume of the particle and an average particle size of the particles calculated based on number of the particle, lies in a range of from 1.00 to 1.35. Thereby, the distribution of the particle size in the toner can be made sharp with mono-dispersion, thus uniform charge quantity can be obtained without being affected by changing in the charge quantity changed according to the toner particle size, because the toner particle size can be made uniform. Therefore, the image with stable and uniform concentration can be recorded on the recording medium all the time. As a result, the image with fine line can be clearly recorded on the recording medium with high resolution.

Claims20

Dependent claims

A dry type developer including colored particles for use in an image recording apparatus of the type having means for supporting a recording medium thereon;

developer providing means for storing the developer charged with one polarity therein;
an aperture electrode comprising an insulator, a control electrode formed on one side of the insulator and an aperture penetrating the control electrode and the insulator;
and a control device for selectively applying a voltage with a reverse polarity to the control electrode in response to which the charged developer is passed through the aperture and directed to a recording medium supported on the support means when a voltage is applied to the control electrode from the control device, wherein
an average particle size of the particles calculated based on volume of the particle is less than 17.0 .mu.m and
a ratio of both an average particle size of the particles calculated based on volume of the particle and an average particle size of the particles calculated based on number of the particle, lies in a range of from 1.00 to 1.50.

2 more elements

Dependencies are inferred from the claim text.