JPH09190120A - Service life detection device for image carrier and image forming device - Google Patents
Service life detection device for image carrier and image forming deviceInfo
- Publication number
- JPH09190120A JPH09190120A JP8017002A JP1700296A JPH09190120A JP H09190120 A JPH09190120 A JP H09190120A JP 8017002 A JP8017002 A JP 8017002A JP 1700296 A JP1700296 A JP 1700296A JP H09190120 A JPH09190120 A JP H09190120A
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- Japan
- Prior art keywords
- image carrier
- surface potential
- potential
- output
- service life
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Control Or Security For Electrophotography (AREA)
- Discharging, Photosensitive Material Shape In Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、レーザプリンタ、
複写機等の画像形成装置における像担持体の寿命検出装
置に関する。TECHNICAL FIELD The present invention relates to a laser printer,
The present invention relates to a life detecting device for an image carrier in an image forming apparatus such as a copying machine.
【０００２】より詳しくは、電子写真感光体、静電記録
誘電体等の像担持体に適宜作像プロセスを適用して画像
形成を実行させ、像担持体は繰り返して作像に供する画
像形成装置における像担持体寿命検出装置に関する。More specifically, an image forming apparatus is provided in which an image forming process is appropriately applied to an image carrier such as an electrophotographic photosensitive member or an electrostatic recording dielectric to execute image formation, and the image carrier is repeatedly subjected to image formation. Of the image carrier lifetime detection device.
【０００３】[0003]
【従来の技術】転写式の画像形成装置のように、電子写
真感光体、静電記録誘導体等の像担持体を繰り返し使用
するものにあっては、像担持体（以下、感光ドラムと記
す）は繰り返しの使用で表面が次第に削れを生じて行き
寿命にいたり、画像形成装置の作像性能が低下する。2. Description of the Related Art An image carrier (hereinafter referred to as a photosensitive drum) is used in a transfer type image forming apparatus such as an electrophotographic photosensitive member or an electrostatic recording derivative which is repeatedly used. With repeated use, the surface is gradually abraded to reach the end of its life, and the image forming performance of the image forming apparatus deteriorates.
【０００４】従来、感光ドラムの寿命検出手段として
は、いくつかの方法がある。例えば、ページカウントに
よりトナーの使用量から推測するもの、また、感光ドラ
ムに対する帯電又は除電時の電流を測定することによ
り、感光ドラムのＣＴ層の膜圧を測定し、寿命として検
出する方法がある。Conventionally, there are several methods for detecting the life of the photosensitive drum. For example, there is a method of inferring it from the amount of toner used by page counting, or a method of measuring the film pressure of the CT layer of the photosensitive drum by measuring the current at the time of charging or discharging the photosensitive drum and detecting it as the life. .
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記し
たページカウントによりトナーの使用量から推測する感
光ドラムの寿命検出手段にあっては、通常各ページ毎に
印字率が大きく異なるため正確な検出が困難であった。However, in the photosensitive drum life detecting means which is estimated from the toner usage based on the above page count, it is usually difficult to detect accurately because the printing rate is largely different for each page. Met.
【０００６】また、感光ドラムに対する帯電又は除電時
の電流を測定することにより、感光ドラムのＣＴ層の膜
圧を測定し、寿命として検出する場合にあっては、検出
電流が環境により大きく変動する、検出電圧を大きくす
るためには検出抵抗を大きくせざるを得ず、感光ドラム
の接地電位が上昇する等の問題があった。Further, in the case of measuring the film pressure of the CT layer of the photosensitive drum by measuring the current at the time of charging or discharging the photosensitive drum and detecting it as the life, the detected current greatly varies depending on the environment. However, in order to increase the detection voltage, there is no choice but to increase the detection resistance, and there is a problem that the ground potential of the photosensitive drum rises.
【０００７】本発明は、上記した従来技術の課題を解決
するためになされたもので、その目的とするところは、
像担持体の正確な寿命検出を行うことにより、ユーザー
に適切な交換時期を通知させ得るの像担持体寿命検出装
置及びそれを用いた画像形成装置を提供することにあ
る。[0007] The present invention has been made to solve the above-mentioned problems of the prior art.
An object of the present invention is to provide an image carrier lifetime detection apparatus and an image forming apparatus using the same, which can notify the user of an appropriate replacement time by accurately detecting the life of the image carrier.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するため
に、本発明にあっては、像担持体の表面電位を検出する
表面電位検出手段と、該表面電位検出手段の出力と予め
定められた所定の電圧とを比較する比較手段を有し、該
比較手段の出力により像担持体の寿命を検出してなるこ
とを特徴とする。In order to achieve the above object, in the present invention, the surface potential detecting means for detecting the surface potential of the image carrier and the output of the surface potential detecting means are predetermined. It is characterized in that it has a comparison means for comparing with a predetermined voltage, and detects the life of the image carrier by the output of the comparison means.
【０００９】上記表面電位検出手段により検出する表面
電位は、像担持体の飽和電位又は残留電位であることを
特徴とする。The surface potential detected by the surface potential detecting means is a saturation potential or a residual potential of the image carrier.
【００１０】そして、上記各構成の像担持体寿命検出装
置を、画像形成装置の像担持体に対して設けたことを特
徴とする。The image carrier life detecting device having the above-described structure is provided for the image carrier of the image forming apparatus.
【００１１】上記構成の像担持体寿命検出装置にあって
は、表面電位検出手段の出力と予め定められた所定の電
圧とを比較する比較手段を設けているため、その比較手
段にて比較した結果の出力により像担持体の寿命を検出
される。このように、比較手段の出力にて検出されるの
で、正確な寿命検出を行うことができる。In the image bearing member life detecting apparatus having the above-mentioned structure, since the comparing means for comparing the output of the surface potential detecting means with the predetermined voltage is provided, the comparing means makes the comparison. The life of the image carrier is detected by the output of the result. In this way, since it is detected by the output of the comparing means, it is possible to accurately detect the life.
【００１２】そして、像担持体の表面電位は、時間と表
面電位との帯電特性において、最高の電位となる飽和電
位と、帯電中止後に露光されて急激に減少した後緩やか
な減衰が始まる時の残留電位とを有しており、像担持体
の繰り返し使用が進み、耐久が進むと、飽和電位は低下
し、残留電位は上昇し、画質の低下を招くようになる。
その画質の低下を招くようになる飽和電位と残留電位は
像担持体により比較的一定していることが知られてい
る。The surface potential of the image bearing member is the maximum potential in terms of the charging characteristics of time and surface potential, and the saturation potential at which the surface potential of the image bearing member becomes the highest after the exposure is stopped after charging is stopped and then gradually attenuates. When the image bearing member is used repeatedly and the durability of the image bearing member increases, the saturation potential decreases, the residual potential increases, and the image quality deteriorates.
It is known that the saturation potential and the residual potential that cause deterioration of the image quality are relatively constant depending on the image carrier.
【００１３】そこで、表面電位検出手段により、飽和電
位又は残留電位を検出し、その出力と予め定められた所
定の電圧として飽和基準電圧又は残留基準電圧とを比較
する比較手段にて比較することで、像担持体の寿命を検
出することでできる。Therefore, the surface potential detecting means detects the saturation potential or the residual potential, and the output thereof is compared with the saturation reference voltage or the residual reference voltage as a predetermined voltage which is determined in advance by the comparison means. , By detecting the life of the image carrier.
【００１４】つまり、飽和電位が低下し、飽和基準電圧
よりも低くなることで、寿命を検出することができる。
また残留電位が上昇し、残留基準電圧よりも高くなるこ
とで寿命が検出される。That is, when the saturation potential decreases and becomes lower than the saturation reference voltage, the life can be detected.
Further, the residual potential rises and becomes higher than the residual reference voltage, so that the life is detected.
【００１５】このように、像担持体により比較的一定し
ている飽和電位と残留電位を検出することで、寿命を検
出することから、上記所定の電圧を交換される像担持体
毎に変える必要がないので、像担持体の交換作業が容易
となる。As described above, since the life is detected by detecting the saturation potential and the residual potential which are relatively constant by the image carrier, it is necessary to change the predetermined voltage for each image carrier to be exchanged. Therefore, the replacement work of the image carrier becomes easy.
【００１６】そして、画像形成装置において上記した像
担持体寿命検出装置を用いることで、寿命の過ぎた像担
持体を使用することがなくなるため、作像性能の安定化
を図ることができる。By using the above-described image carrier life detecting device in the image forming apparatus, it is possible to stabilize the image forming performance because it is not necessary to use the image carrier which has reached the end of its life.
【００１７】[0017]
（実施の形態１）以下に本発明を図示の実施の形態に基
づいて説明する。(Embodiment 1) The present invention will be described below based on the illustrated embodiment.
【００１８】図１は本発明の実施の形態１に係る像担持
体寿命検出装置全体のブロック図である。FIG. 1 is a block diagram of the entire image carrier life detecting device according to the first embodiment of the present invention.
【００１９】同図において、１は帯電した像担持体とし
ての感光体ドラム、２は表面電位検出手段としての表面
電位センサー、３は比較手段としての比較器である。In the figure, 1 is a photosensitive drum as a charged image carrier, 2 is a surface potential sensor as surface potential detecting means, and 3 is a comparator as comparing means.
【００２０】表面電位センサー２の内部において、１１
は感光ドラム１上の電荷からの電束を通過又は遮断する
ためのシャッター、１２は電束を検出するための検出電
極、１３は直流分をカットするコンデンサー、１４は増
幅器、１５は位相弁別・平滑回路、１６は比較増幅器
（反転増幅器）、１７は反転増幅器１６の出力に応答し
て高圧電圧を出力する高圧回路であり、その出力は前記
シャッター１１に供給されている。Inside the surface potential sensor 2, 11
Is a shutter for passing or blocking an electric flux from the electric charge on the photosensitive drum 1, 12 is a detection electrode for detecting the electric flux, 13 is a capacitor for cutting a direct current component, 14 is an amplifier, 15 is phase discrimination / A smoothing circuit, 16 is a comparison amplifier (inverting amplifier), 17 is a high voltage circuit that outputs a high voltage in response to the output of the inverting amplifier 16, and the output thereof is supplied to the shutter 11.
【００２１】図２はシャッター１１の詳細図である。シ
ャッター１１には羽根２１を有しており、その羽根２１
は電歪素子２２を介して発信素子２３により所定の周波
数で励振される。その結果、シャッター１１の羽根２１
は図中矢印の方向に往復振動する。FIG. 2 is a detailed view of the shutter 11. The shutter 11 has a blade 21. The blade 21
Is excited at a predetermined frequency by the transmission element 23 via the electrostrictive element 22. As a result, the blades 21 of the shutter 11
Reciprocates in the direction of the arrow in the figure.
【００２２】まず、図１及び図２を用いて表面電位検出
の動作説明を行う。First, the operation of surface potential detection will be described with reference to FIGS.
【００２３】シャッター１１の羽根２１には、高圧回路
１７により予め適当な高圧Ｖ１が印加されている。羽根
２１はこの電位を保ったまま、電歪素子２２を介して発
信素子２３により、例えば１ＫＨｚの周波数で励振され
る。An appropriate high voltage V1 is applied to the blades 21 of the shutter 11 by the high voltage circuit 17 in advance. While maintaining this potential, the blade 21 is excited by the transmitting element 23 via the electrostrictive element 22 at a frequency of 1 KHz, for example.
【００２４】感光ドラム１上の電荷が検出電極１２に対
して発する電束は、羽根２１の開閉により上記周波数で
遮断・通過が繰り返される。羽根２１は電位Ｖ１を持っ
ているので、感光ドラム１の帯電電位をＶ０とすると、
検出電極１２を介して増幅器１４にはＶ０−Ｖ１に比例
した振幅を有し、上記周波数を有する方形電圧が取り出
される。The electric flux generated by the charge on the photosensitive drum 1 to the detection electrode 12 is repeatedly cut off and passed at the above frequency by opening and closing the blade 21. Since the blade 21 has a potential V1, if the charging potential of the photosensitive drum 1 is V0,
A square voltage having an amplitude proportional to V0-V1 and having the above frequency is taken out from the detection electrode 12 to the amplifier 14.
【００２５】この検出電圧は、コンデンサー１３により
直流分がカットされているためＧＮＤを中心として正負
に振れているので（図１（ｂ）参照）、続く位相弁別・
平滑回路１５により、シャッター１１の電位が感光ドラ
ム１の電位より高い場合には正方向のパルス（図１
（ｃ）参照）が、シャッター１１の電位が感光ドラム１
の電位より低い場合には負方向のパルスが取り出され、
位相弁別・平滑回路１５により直流分が取り出される。Since this detection voltage has a direct current component cut by the capacitor 13, it swings positively and negatively around GND (see FIG. 1 (b)).
When the potential of the shutter 11 is higher than the potential of the photosensitive drum 1, the smoothing circuit 15 causes a positive pulse (see FIG. 1).
(See (c)), but the potential of the shutter 11 is the photosensitive drum 1
If the potential is lower than the
The DC component is extracted by the phase discrimination / smoothing circuit 15.
【００２６】この直流分は反転増幅器１６により増幅さ
れて高圧回路１７をドライブする。高圧回路１７は、上
記直流分が正、即ちシャッター１１の電位が感光ドラム
１の電位より高い場合には高圧出力を下げる方向に、ま
た、上記直流分が負、即ちシャッター１１の電位が感光
ドラム１の電位より低い場合には高圧出力を上げる方向
に働く。This DC component is amplified by the inverting amplifier 16 and drives the high voltage circuit 17. The high-voltage circuit 17 decreases the high-voltage output when the DC component is positive, that is, the potential of the shutter 11 is higher than the potential of the photosensitive drum 1, and the DC component is negative, that is, the potential of the shutter 11 is photosensitive drum. When the potential is lower than 1, it works to increase the high voltage output.
【００２７】このため、シャッター１１の羽根２１の電
位が感光ドラム１の電位とちょうどつり合ったところで
増幅器１４の出力は、パルスがなくなり、ＧＮＤ電位に
等しくなる。このときの高圧回路１７の出力電圧が感光
ドラム１の表面電位に等しい。For this reason, when the potential of the blade 21 of the shutter 11 is just balanced with the potential of the photosensitive drum 1, the output of the amplifier 14 becomes pulseless and equal to the GND potential. The output voltage of the high voltage circuit 17 at this time is equal to the surface potential of the photosensitive drum 1.
【００２８】次に、図３に基づき感光ドラム１の表面電
位の変化について説明する。Next, changes in the surface potential of the photosensitive drum 1 will be described with reference to FIG.
【００２９】一般に感光ドラム１は図３のような帯電特
性を有する。即ち、暗所において例えば帯電ローラによ
り接触帯電を行うと、時間とともに表面電位は増加し、
飽和電位Ｖm に達する。これは、帯電電位が高くなるに
つれ感光ドラム１の抵抗が低くなり、感光ドラム１が保
持できる電荷量が制限され、帯電速度と感光ドラム１中
を電荷がリークする速度がつり合い、それ以上帯電でき
なくためである。Generally, the photosensitive drum 1 has a charging characteristic as shown in FIG. That is, when contact charging is performed by a charging roller in a dark place, the surface potential increases with time,
The saturation potential V m is reached. This is because as the charging potential becomes higher, the resistance of the photosensitive drum 1 becomes lower, the amount of electric charge that the photosensitive drum 1 can hold is limited, and the charging speed and the speed at which the electric charge leaks in the photosensitive drum 1 are balanced, and more charging is possible. It is because it is lost.
【００３０】次に、暗所で帯電を中止すると、表面電位
は感光ドラム１固有の暗減衰特性に従って低下する。更
に、感光ドラム１を露光すると表面電位は、最初急激に
減少するが、その後緩やかに減少する。この緩やかな減
衰が始まるときの表面電位が残留電位Ｖr である。Next, when charging is stopped in a dark place, the surface potential decreases according to the dark decay characteristic of the photosensitive drum 1. Further, when the photosensitive drum 1 is exposed to light, the surface potential first sharply decreases, but then gradually decreases. The surface potential when this gradual decay starts is the residual potential V r .
【００３１】ところで、感光ドラム１の耐久が進むほ
ど、上述の飽和電位Ｖm は低下し、また、残留電位Ｖr
は上昇し、画質の低下を招く飽和電位Ｖm または残留電
位Ｖrは感光ドラム１により比較的一定していることが
知られている。By the way, as the durability of the photosensitive drum 1 progresses, the above-mentioned saturation potential V m decreases and the residual potential V r.
It is known that the saturation potential V m or the residual potential V r , which increases and the image quality is degraded, is relatively constant by the photosensitive drum 1.
【００３２】再び図１に戻って寿命検出の方法を説明す
る。Returning to FIG. 1, the method for detecting the life will be described.
【００３３】比較器３の一方の入力には高圧回路１７の
出力が、他方の入力には感光ドラム１の寿命点に対応し
た飽和基準電圧が入力されている。感光ドラム１の初期
状態においては、比較器３の出力は負である。ところ
が、寿命点に達すると高圧出力即ち感光ドラム１の表面
電位である飽和電位Ｖm は飽和基準電圧よりも低くなる
ので比較器３の出力は正に転ずるので、これを以って寿
命警告とすることができる。The output of the high voltage circuit 17 is input to one input of the comparator 3, and the saturation reference voltage corresponding to the life of the photosensitive drum 1 is input to the other input. In the initial state of the photosensitive drum 1, the output of the comparator 3 is negative. However, when the end of the life is reached, the high voltage output, that is, the saturation potential V m, which is the surface potential of the photosensitive drum 1, becomes lower than the saturation reference voltage, so the output of the comparator 3 shifts to the positive side. can do.
【００３４】これにより、上記した像担持体寿命検出装
置を用いた画像形成装置において、寿命の過ぎた感光ド
ラム１を使用することがなくなるため、作像性能の安定
化を図ることができる。As a result, in the image forming apparatus using the above-described image carrier lifetime detecting device, the photosensitive drum 1 whose lifetime has expired is not used, so that the image forming performance can be stabilized.
【００３５】（実施の形態２）図４は本発明の実施の形
態２に係る像担持体寿命検出装置全体のブロック図であ
る。本実施の形態は、上記実施の形態１と比べて比較器
３３の部分が違うだけとなっている。(Embodiment 2) FIG. 4 is a block diagram of the entire image carrier life detecting apparatus according to Embodiment 2 of the present invention. The present embodiment is different from the first embodiment only in the part of the comparator 33.
【００３６】即ち、比較器３３の一方の入力には高圧回
路１７の出力が、他方の入力には感光ドラム１の寿命点
に対応した残留基準電圧が入力されており、感光ドラム
１の初期状態においては、比較器３３の出力は負であ
る。That is, the output of the high voltage circuit 17 is input to one input of the comparator 33, and the residual reference voltage corresponding to the life point of the photosensitive drum 1 is input to the other input of the comparator 33. At, the output of comparator 33 is negative.
【００３７】ところが、寿命点に達すると高圧出力即ち
上記実施の形態１で説明した感光ドラム１の表面電位で
ある残留電位Ｖr は残留基準電圧よりも高くなるので比
較器３３の出力は正に転ずるので、これを以って寿命警
告とすることができる。However, when the life is reached, the high voltage output, that is, the residual potential V r, which is the surface potential of the photosensitive drum 1 described in the first embodiment, becomes higher than the residual reference voltage, so the output of the comparator 33 becomes positive. Since it falls, this can be used as a life warning.
【００３８】その他の構成及び作用については上記実施
の形態１と同一なので、同一の構成部分については同一
の符号を付して、その説明は省略する。Since other configurations and operations are the same as those of the first embodiment, the same components are designated by the same reference numerals and the description thereof will be omitted.
【００３９】なお、上記各実施の形態では、像担持体と
して感光ドラムを用いて説明したが、静電記録誘電体等
であっても同様に適用することができる。In each of the above-described embodiments, the photosensitive drum is used as the image bearing member, but the invention can be similarly applied to an electrostatic recording dielectric or the like.
【００４０】[0040]
【発明の効果】以上述べたように、本発明では像担持体
の表面電位を検出する表面電位検出手段と、該表面電位
検出手段の出力と予め定められた所定の電圧とを比較す
る比較手段を有し、該比較手段の出力により像担持体の
寿命検出を正確に行うことが可能となり、ユーザーに適
切な交換時期を通知させることができるようになった。As described above, according to the present invention, the surface potential detecting means for detecting the surface potential of the image carrier and the comparing means for comparing the output of the surface potential detecting means with a predetermined voltage. It is possible to accurately detect the life of the image bearing member by the output of the comparison means, and to notify the user of an appropriate replacement time.
【００４１】また、表面電位検出手段により、像担持体
により帯電特性において比較的一定している飽和電位と
残留電位を検出することで、寿命を検出するようにした
ので、予め定められた所定の電圧を交換される像担持体
毎に変える必要がなく、像担持体の交換作業が容易とな
る。Further, since the surface potential detecting means detects the saturation potential and the residual potential, which are relatively constant in the charging characteristic by the image carrier, the life is detected, so that the predetermined predetermined value is set. Since it is not necessary to change the voltage for each image carrier to be replaced, the replacement work of the image carrier becomes easy.
【００４２】そして、画像形成装置において上記した像
担持体寿命検出装置を用いることで、寿命の過ぎた像担
持体を使用することがなくなるため、作像性能の安定化
を図ることができる。By using the above-described image carrier life detecting device in the image forming apparatus, it is possible to stabilize the image forming performance because the image carrier which has expired is not used.
【図１】図１は本発明の実施の形態１に係る像担持体寿
命検出装置全体のブロック図でる。FIG. 1 is a block diagram of an entire image carrier lifetime detection device according to a first embodiment of the present invention.
【図２】図２は像担持体寿命検出装置のシャッターの詳
細図である。FIG. 2 is a detailed view of a shutter of the image carrier lifetime detection device.
【図３】図３は感光ドラムの帯電特性を示すグラフであ
る。FIG. 3 is a graph showing a charging characteristic of a photosensitive drum.
【図４】図４は本発明の実施の形態２に係る像担持体寿
命検出装置全体のブロック図である。FIG. 4 is a block diagram of an entire image carrier lifetime detection device according to a second embodiment of the present invention.
１ 感光ドラム（像担持体） ２ 表面電位センサー（表面電位検出手段） ３、３３ 比較器（比較手段） １１ シャッター １２ 検出電極 １３ コンデンサー １４ 増幅器 １５ 位相弁別・平滑回路 １６ 比較増幅器（反転増幅器） １７ 高圧回路 ２１ 羽根 ２２ 電歪素子 ２３ 発信素子 1 Photosensitive Drum (Image Carrier) 2 Surface Potential Sensor (Surface Potential Detection Means) 3, 33 Comparator (Comparison Means) 11 Shutter 12 Detection Electrode 13 Condenser 14 Amplifier 15 Phase Discrimination / Smoothing Circuit 16 Comparison Amplifier (Inversion Amplifier) 17 High voltage circuit 21 Blade 22 Electrostrictive element 23 Transmitting element
Claims (4)
検出手段と、該表面電位検出手段の出力と予め定められ
た所定の電圧とを比較する比較手段を有し、該比較手段
の出力により像担持体の寿命を検出してなることを特徴
とする像担持体寿命検出装置。1. A surface potential detecting means for detecting a surface potential of an image carrier, and a comparing means for comparing an output of the surface potential detecting means with a predetermined voltage, the output of the comparing means. An image carrier lifetime detection device, characterized in that the lifetime of the image carrier is detected by means of.
位は、像担持体の飽和電位であることを特徴とする請求
項１に記載の像担持体寿命検出装置。2. The image carrier lifetime detecting device according to claim 1, wherein the surface potential detected by the surface potential detecting means is a saturation potential of the image carrier.
位は、像担持体の残留電位であることを特徴とする請求
項１に記載の像担持体寿命検出装置。3. The image carrier lifetime detection device according to claim 1, wherein the surface potential detected by the surface potential detecting means is a residual potential of the image carrier.
命検出装置を、像担持体に対して設けたことを特徴とす
る画像形成装置。4. An image forming apparatus, wherein the image carrier life detecting device according to claim 1, 2 or 3 is provided for the image carrier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8017002A JPH09190120A (en) | 1996-01-08 | 1996-01-08 | Service life detection device for image carrier and image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8017002A JPH09190120A (en) | 1996-01-08 | 1996-01-08 | Service life detection device for image carrier and image forming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09190120A true JPH09190120A (en) | 1997-07-22 |
Family
ID=11931809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8017002A Withdrawn JPH09190120A (en) | 1996-01-08 | 1996-01-08 | Service life detection device for image carrier and image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09190120A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7263299B2 (en) | 2004-11-12 | 2007-08-28 | Kabushiki Kaisha Toshiba | Image forming apparatus that judges lifetime of photosensitive unit |
| US8019239B2 (en) | 2008-11-25 | 2011-09-13 | Ricoh Company, Limited | Device and method for detecting life of organic photoreceptor and image forming apparatus |
-
1996
- 1996-01-08 JP JP8017002A patent/JPH09190120A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7263299B2 (en) | 2004-11-12 | 2007-08-28 | Kabushiki Kaisha Toshiba | Image forming apparatus that judges lifetime of photosensitive unit |
| US7359650B2 (en) | 2004-11-12 | 2008-04-15 | Kabushiki Kaisha Toshiba | Image forming apparatus and method for judging the lifetime of a photosensitive unit |
| US7433611B2 (en) | 2004-11-12 | 2008-10-07 | Kabushiki Kaisha Toshiba | Image forming apparatus that judges lifetime of photosensitive unit |
| US8019239B2 (en) | 2008-11-25 | 2011-09-13 | Ricoh Company, Limited | Device and method for detecting life of organic photoreceptor and image forming apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20030401 |