JPS60100758U

JPS60100758U - developing device

Info

Publication number: JPS60100758U
Application number: JP19340783U
Authority: JP
Inventors: 向井　秀雄
Original assignee: 株式会社東芝
Priority date: 1983-12-15
Filing date: 1983-12-15
Publication date: 1985-07-09

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は従来の濃度測定装置を説明するために示す回路
構成図、第２図は従来の濃度測定装置を用いた現像装置
を示す構成図、第３図は従来の濃度測定装置を示す概略
構成図、第４図はこの考案に使用される磁気回路を示す
構成図、第５図は第４図に示す磁気回路を用いた濃度測
定装置を示す要部の回路構成図、第６図は第５図に示す
回路の実施例を示すもので一部断面とした回路構成図、
第７図は第６図に示す回路を現像装置に実装した状態を
示す構成図である。１ａ・・・・・・測定用磁気回路、１ｂ・・・・・・比
較用磁気回路、８・・・・・・磁気抵抗調整用部材、４
１・・・・・・磁気コア、４２・・・・・・入力コイル
、４３・・・・・・出力コイル、６１・・・・・・モー
ルド材、６１□・・・・・・開口部側表面。Fig. 1 is a circuit configuration diagram shown to explain a conventional density measurement device, Fig. 2 is a configuration diagram showing a developing device using the conventional density measurement device, and Fig. 3 is a schematic diagram showing a conventional density measurement device. 4 is a block diagram showing the magnetic circuit used in this invention, FIG. 5 is a circuit block diagram of the main part of the concentration measuring device using the magnetic circuit shown in FIG. 4, and FIG. A partially cross-sectional circuit configuration diagram showing an example of the circuit shown in FIG.
FIG. 7 is a configuration diagram showing a state in which the circuit shown in FIG. 6 is mounted on a developing device. 1a... Magnetic circuit for measurement, 1b... Magnetic circuit for comparison, 8... Magnetic resistance adjustment member, 4
1...Magnetic core, 42...Input coil, 43...Output coil, 61...Mold material, 61□...Opening side surface.

Claims

[Scope of utility model registration request]

(1) In a developing device having a density measuring means for measuring a change in developer density as a change in magnetic permeability, a magnetic circuit for measurement and a magnetic circuit for comparison constituting the density measuring means are formed by magnetic circuits having the same configuration. A developing device characterized in that a magnetic circuit for measurement and a magnetic circuit for comparison are arranged separately.

(2) The magnetic circuit is molded into the same shape by a molding material, and the surface of the molding material corresponding to the opening of the magnetic path is smooth as claimed in claim 1 of the utility model registration claim. Developing device.

(3) The developing device according to claim 2, wherein the magnetic circuit used as the comparative magnetic circuit has a magnetic resistance adjusting member provided on the smooth surface of the molding material. Device.