JPH0531668Y2 - - Google Patents
Info
- Publication number
- JPH0531668Y2 JPH0531668Y2 JP1985150672U JP15067285U JPH0531668Y2 JP H0531668 Y2 JPH0531668 Y2 JP H0531668Y2 JP 1985150672 U JP1985150672 U JP 1985150672U JP 15067285 U JP15067285 U JP 15067285U JP H0531668 Y2 JPH0531668 Y2 JP H0531668Y2
- Authority
- JP
- Japan
- Prior art keywords
- light source
- light
- photoreceptor
- static eliminator
- cylindrical body
- 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.)
- Expired - Lifetime
Links
- 108091008695 photoreceptors Proteins 0.000 claims description 37
- 230000003068 static effect Effects 0.000 claims description 21
- 229920003002 synthetic resin Polymers 0.000 claims description 4
- 239000000057 synthetic resin Substances 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Landscapes
- Discharging, Photosensitive Material Shape In Electrophotography (AREA)
Description
【考案の詳細な説明】
〈産業上の利用分野〉
この考案は除電装置に関し、さらに詳細にいえ
ば、感光体上の残留電荷を除去する除電装置に関
する。[Detailed Description of the Invention] <Industrial Field of Application> This invention relates to a static eliminator, and more specifically, to a static eliminator that removes residual charges on a photoreceptor.
〈従来の技術、および考案が解決しようとする問
題点〉
一般に複写機は感光体表面に静電潜像を形成
し、この静電潜像にトナーを付着させることによ
り現像を行ない、得られたトナー像を複写紙に転
写する。そして、転写後、感光体表面に残留する
トナーを除去し、さらに除電ランプにて光照射を
行なうことにより、感光体上の残留電荷を除去す
るようにしている。<Prior art and problems to be solved by the invention> In general, copying machines form an electrostatic latent image on the surface of a photoreceptor, and develop it by attaching toner to this electrostatic latent image. Transfer the toner image to copy paper. After the transfer, the toner remaining on the surface of the photoreceptor is removed, and the residual charge on the photoreceptor is removed by irradiating light with a charge eliminating lamp.
このような複写機においては、いわゆる高感度
タイプ（高疲労タイプ）の感光体が多用されるに
至つている。 In such copying machines, so-called high-sensitivity type (high-fatigue type) photoreceptors are increasingly being used.
このような感光体は、感光層内において電子、
あるいは正孔が層中深く捕獲されてしまうことに
起因して、除電ランプによる残留電荷の除去の際
に、初期帯電電位の連続的降下が発生するという
問題がある。 Such a photoreceptor has electrons and
Alternatively, there is a problem in that the initial charging potential continuously drops when residual charges are removed by a static elimination lamp due to holes being trapped deep in the layer.
この点を考慮して、感光体が疲労しにくい光
（短波長光）を発する光源を使用して除電を行つ
ている。 In consideration of this point, static electricity is removed using a light source that emits light (short wavelength light) that does not cause fatigue to the photoreceptor.
一般に、除電装置は、感光体の動作と同期させ
て点灯、消灯が制御される必要がある。しかしな
がら、上記短波長光源を使用すると、その特性上
立ち上がりに時間を要する。例えば、冷陰極管で
あると、第７図の如く、20℃で飽和光量に到るま
でに３分前後を要する。このため、逆に感光体の
表面電位の乗り方に支障をきたし、第８図に示す
ように、あたかも感光体の初期電位降下と思われ
るような現象が表れることがある。したがつて、
安定した複写が１枚目より得ることができない場
合がある。 In general, the static eliminator needs to be turned on and off in synchronization with the operation of the photoreceptor. However, when the short wavelength light source is used, it takes time to start up due to its characteristics. For example, in the case of a cold cathode tube, as shown in FIG. 7, it takes about 3 minutes to reach the saturated light amount at 20°C. This may adversely affect how the surface potential of the photoreceptor increases, and as shown in FIG. 8, a phenomenon that appears to be a drop in the initial potential of the photoreceptor may appear. Therefore,
There are cases where stable copies cannot be obtained from the first copy.
この考案は、上記に鑑み、光源の持つ立ち上が
り特性をカツトし、感光体の電位降下を疲労によ
る電位降下だけに抑えて、安定した複写を１枚目
より得ることができる除電装置の提供を目的とす
る。 In view of the above, the purpose of this invention is to provide a static eliminator that can eliminate the rising characteristic of the light source, limit the potential drop on the photoreceptor to only that due to fatigue, and obtain stable copies from the first copy. shall be.
〈問題点を解決するための手段〉
上記の目的を達成するための、この考案の除電
装置は、像形成に先だつて点灯される光源と、光
源と感光体との間に選択的に介在されて、光源か
らの照射光を感光体に対して遮光する遮光部材
と、光源が点灯された後、光源の光量が安定する
まで、遮光部材を光源と感光体との間に介在させ
る駆動部材とを有するものである。但し、上記遮
光部材としては、金属製の筒状体の所定位置にス
リツトを形成したものであつてもよく、または、
合成樹脂製の筒状体の一部を光透過部とし、残余
の部分を光非透過部としたものであつもよい。さ
らに、上記駆動部材としては、ロータリーソレノ
イドであつてもよい。<Means for Solving the Problems> In order to achieve the above object, the static eliminator of this invention includes a light source that is turned on prior to image formation, and a light source that is selectively interposed between the light source and the photoreceptor. a light shielding member that shields the photoreceptor from the irradiation light from the light source; and a drive member that interposes the light shielding member between the light source and the photoreceptor until the amount of light from the light source stabilizes after the light source is turned on. It has the following. However, the light shielding member may be a metal cylindrical body with slits formed at predetermined positions, or
A part of the cylindrical body made of synthetic resin may be a light transmitting part, and the remaining part may be a light non-transmitting part. Furthermore, the driving member may be a rotary solenoid.
〈作用〉
上記構造の除電装置であれば、光源が点灯され
た後、光源の光量が安定するまで遮光部材を駆動
部材により光源と感光体との間に介在させること
ができるから、光源の光量が安定したときに遮光
部材を光源と感光体との間から退避させれば、感
光体には常に一定した光量で光を照射することが
できる。<Function> With the static eliminator having the above structure, after the light source is turned on, the light shielding member can be interposed between the light source and the photoreceptor by the driving member until the light intensity of the light source is stabilized. By retracting the light shielding member from between the light source and the photoreceptor when the amount of light has stabilized, the photoreceptor can be irradiated with light at a constant amount of light.
したがつて、光源の立ち上がり特性をカツト
し、感光体の電位降下を疲労による電位降下だけ
に抑えることができる。よつて、安定した複写が
１枚目より得ることができる。 Therefore, the rise characteristic of the light source can be cut, and the potential drop of the photoreceptor can be suppressed to only the potential drop due to fatigue. Therefore, stable copies can be obtained from the first copy.
但し、遮光部材が金属製の筒状体の所定位置に
スリツトを形成したもの、あるいは合成樹脂製の
筒状体の一部を光透過部とし、残余の部分を非透
過部としたものであれば、筒状体を光源の光量が
安定するタイミングに合わせて回動させるだけ
で、感光体に常に一定した光量で照射することが
可能となる。 However, if the light shielding member is a metal cylindrical body with slits formed at predetermined positions, or a synthetic resin cylindrical body with part of it as a light transmitting part and the remaining part as a non-transmissive part, For example, simply by rotating the cylindrical body in accordance with the timing when the light intensity of the light source becomes stable, it becomes possible to always irradiate the photoreceptor with a constant light intensity.
さらに、上記駆動部材としては、ロータリーソ
レノイドであつても、同様に感光体に常に一定し
た光量で照射することが可能となる。 Furthermore, even if the driving member is a rotary solenoid, it is possible to irradiate the photoreceptor with a constant amount of light.
〈実施例〉
以下、実施例を示す添付図面によつて詳細に説
明する。<Examples> Hereinafter, examples will be described in detail with reference to the accompanying drawings showing examples.
第５図は複写機の要部を示す概略図であり、コ
ンタクトガラス１の上にセツトされた原稿Ｄを露
光すべく、光源２１、反射鏡２２，２３，２４，
レンズ２５、および反射鏡２６で構成される光学
系２を有しているとともに、光学系２の下方に、
感光体ドラム３１、およびその周囲に配設された
帯電チヤージヤ３３、現像装置Ｇ、転写・分離チ
ヤージヤ３′、クリーナ３８、後述する除電装置
３２から構成される複写処理部３を有し、さらに
最下部に、給紙カセツト１１から用紙を１枚づつ
送込む給紙ローラ４１、搬送ローラ４２、レジス
トローラ４３、搬送ベルト４４、定着装置４５、
および用紙を受け皿１２の上を排出する排出ロー
ラ４６から構成される用紙搬送部４を有してい
る。 FIG. 5 is a schematic diagram showing the main parts of a copying machine, in which a light source 21, reflecting mirrors 22, 23, 24,
It has an optical system 2 composed of a lens 25 and a reflecting mirror 26, and below the optical system 2,
It has a copying processing section 3 consisting of a photosensitive drum 31, a charging charger 33 disposed around it, a developing device G, a transfer/separation charger 3', a cleaner 38, and a static eliminator 32 to be described later. At the bottom, there are a paper feed roller 41 that feeds paper sheets one by one from the paper feed cassette 11, a transport roller 42, a registration roller 43, a transport belt 44, a fixing device 45,
and a paper conveying section 4 that includes a discharge roller 46 that discharges the paper onto the receiving tray 12.
第１図から第３図は除電装置３２の構成を詳細
に示す図であり、蛍光ランプ（例えば、冷陰極
管）等からなる光源５１の周囲を、遮光部材とし
ての合成樹脂製の筒状体５２で包囲している。こ
の筒状体５２は、180度の範囲を透明部分５３と
しているとともに、残余の範囲を不透明部分５４
としている。そして、上記筒状体５２は、中央部
が折曲され、両端部が互に平行に形成された回転
軸５５によりロータリーソレノイド５６と連結さ
れて、回動されるようにしている。 1 to 3 are diagrams showing the configuration of the static eliminator 32 in detail, in which a light source 51 made of a fluorescent lamp (for example, a cold cathode tube) is surrounded by a synthetic resin cylindrical body as a light shielding member. It is surrounded by 52. This cylindrical body 52 has a 180 degree range as a transparent part 53, and the remaining range as an opaque part 54.
It is said that The cylindrical body 52 is bent at its center and connected to a rotary solenoid 56 by a rotating shaft 55 formed parallel to each other at both ends so as to be rotated.
上記ロータリーソレノイド５６は、コイル５７
を内蔵する本体部５８に対して回転可能な作動部
５９を取付けており、この作動部５９の中央部に
上記回転軸５５が固定されている。そして、ロー
タリーソレノイド５６は、光源２１が点灯された
後、光源２１の光量が安定するまでは上記筒状体
５２の不透明部分５４を光源２１と感光体ドラム
３１との間に介在させ、光源３１の光量が安定し
たならば、筒状体５２を回転軸５５周りに回動さ
せて透明部分５３を光源２１と感光体ドラム３１
との間に介在させるよう構成されている。 The rotary solenoid 56 has a coil 57
A rotatable actuating part 59 is attached to a main body part 58 that incorporates a rotatable actuating part 59, and the rotating shaft 55 is fixed to the central part of this actuating part 59. After the light source 21 is turned on, the rotary solenoid 56 interposes the opaque portion 54 of the cylindrical body 52 between the light source 21 and the photoreceptor drum 31 until the amount of light from the light source 21 becomes stable. Once the amount of light has stabilized, the cylindrical body 52 is rotated around the rotating shaft 55, and the transparent portion 53 is connected to the light source 21 and the photoreceptor drum 31.
It is configured to be interposed between the
尚、６０はケーシングであり、６１は光源５１
を支持する支持体であり、６２はベアリングであ
る。上記ケーシング６０は少なくとも一方が開放
されたものであり、この開放部分を感光体ドラム
３１と対向させた状態で固定されている。 In addition, 60 is a casing, and 61 is a light source 51.
62 is a bearing. The casing 60 has at least one side open, and is fixed with this open side facing the photosensitive drum 31.
第４図は光源５１、ロータリーソレノイド５６
等の動作を説明するタイミングチヤートであり、
複写機の電源スイツチを投入すると同時に、定着
装置４５への通電、および光源５１への通電を行
なうことにより、定着装置４５の所定温度までの
昇温を行なわせ、光源５１を連続的に点灯させ、
ロータリーソレノイド５６が駆動されない状態で
筒状体５２を、不透明部材５４が光源５１と感光
体ドラム３１との間に位置する状態に設定する。
したがつて、この状態において感光体ドラム３１
には除電光が全く照射されない。 Figure 4 shows a light source 51 and a rotary solenoid 56.
This is a timing chart that explains the operation of
When the power switch of the copying machine is turned on, power is supplied to the fixing device 45 and the light source 51 at the same time, thereby raising the temperature of the fixing device 45 to a predetermined temperature and causing the light source 51 to turn on continuously. ,
The cylindrical body 52 is set in a state where the opaque member 54 is located between the light source 51 and the photosensitive drum 31 with the rotary solenoid 56 not being driven.
Therefore, in this state, the photosensitive drum 31
is not irradiated with any static eliminating light.
その後、定着装置４５が所定の安定温度まで昇
温し、光源２１の光量が安定した光量（飽和光
量）に達し、図示しないプリンキーが操作された
場合には、感光体ドラム３１が回転駆動されると
ともに、ロータリーソレノイド５６が駆動され
て、筒状体５２を透明部分５３が光源５１と感光
体ドラム３１との間に位置する状態になるよう、
矢印で示す方向に回動させるので、直ちに安定し
た除電光が感光体ドラム３１の表面に照射され
る。したがつて、感光体ドラム３１の表面の帯電
電以降下は、第６図のように非常に小さくなる。
この電位降下は、例えば設定電位が800V（温度が
20℃）の場合に30V以下であり、第８図に示す従
来例の100V程度の電位降下と比較して大幅に改
善されている。特に温度が低下した場合には、除
電装置３２の立上がりに10分以上かかるので、上
記の改善幅は一層大きなものになる。 Thereafter, when the temperature of the fixing device 45 rises to a predetermined stable temperature, the light amount of the light source 21 reaches a stable light amount (saturated light amount), and a plink key (not shown) is operated, the photoreceptor drum 31 is rotationally driven. At the same time, the rotary solenoid 56 is driven to move the cylindrical body 52 so that the transparent portion 53 is located between the light source 51 and the photoreceptor drum 31.
Since the photoreceptor drum 31 is rotated in the direction indicated by the arrow, the surface of the photoreceptor drum 31 is immediately irradiated with stable static eliminating light. Therefore, after the surface of the photosensitive drum 31 is charged, it becomes very small as shown in FIG.
This potential drop is caused by, for example, a set potential of 800V (temperature
(20°C), the potential drop is 30 V or less, which is a significant improvement compared to the approximately 100 V potential drop in the conventional example shown in FIG. In particular, when the temperature drops, it takes 10 minutes or more for the static eliminator 32 to start up, so the above improvement becomes even larger.
すなわち、光源２１の持つ立ち上がり特性をカ
ツトし、感光体ドラム３１の電位降下を疲労によ
る電位降下だけに抑えることができる。よつて、
安定した複写を１枚目から得ることができる。 That is, the rise characteristic of the light source 21 can be cut, and the potential drop of the photoreceptor drum 31 can be suppressed to only the potential drop due to fatigue. Then,
Stable copies can be obtained from the first copy.
尚、この考案は上記の実施例に限定されるもの
ではなく、例えば、ロータリーソレノイド５６に
代えて、ギヤ機構、カム機構等を使用することが
可能である。 Note that this invention is not limited to the above-mentioned embodiment, and for example, a gear mechanism, a cam mechanism, etc. can be used in place of the rotary solenoid 56.
〈考案の効果〉
以上の説明から明らかな通り、この考案による
と、光源が点灯された後、光源の光量が安定する
まで遮光部材を駆動部材により光源と感光体との
間に介在させることができるから、光源の光量が
安定したときに遮光部材を光源と感光体との間か
ら退避させれば、感光体には常に一定した光量で
光を照射することができる。<Effect of the invention> As is clear from the above explanation, according to this invention, after the light source is turned on, the light shielding member can be interposed between the light source and the photoreceptor by the driving member until the light intensity of the light source is stabilized. Therefore, by retracting the light blocking member from between the light source and the photoreceptor when the amount of light from the light source becomes stable, the photoreceptor can always be irradiated with light at a constant amount of light.
したがつて、光源の立ち上がり特性をカツト
し、感光体の電位降下を疲労による電位降下だけ
に抑えることができる。よつて、安定した複写が
１枚目より得ることができるといつた優れた効果
がある。 Therefore, the rise characteristic of the light source can be cut, and the potential drop of the photoreceptor can be suppressed to only the potential drop due to fatigue. Therefore, there is an excellent effect that stable copies can be obtained from the first copy.
第１図は除電装置の斜視図、第２図は側面図、第
３図は第２図の−線断面図、第４図はタイム
チヤート、第５図は複写機の要部を示す側面図、
第６図はこの考案の除電装置による感光体の帯電
電位降下を示す図、第７図は光源５１の立上がり
特性を示す図、第８図は従来の除電装置による感
光体の帯電電位降下を示す図。
５１……光源、５２……遮光部材としての筒状
体、５３……透明部分、５４……不透明部分、５
６……ロータリーソレノイド。
Fig. 1 is a perspective view of the static eliminator, Fig. 2 is a side view, Fig. 3 is a sectional view taken along the line - - in Fig. 2, Fig. 4 is a time chart, and Fig. 5 is a side view showing the main parts of the copying machine. ,
FIG. 6 is a diagram showing the charge potential drop of the photoreceptor due to the static eliminator of this invention, FIG. 7 is a diagram showing the rise characteristics of the light source 51, and FIG. 8 is a diagram showing the charge potential drop of the photoreceptor due to the conventional static eliminator. figure. 51... Light source, 52... Cylindrical body as a light shielding member, 53... Transparent portion, 54... Opaque portion, 5
6...Rotary solenoid.
Claims (1)
つて、像形成に先だつて点灯される光源と、光
源と感光体との間に選択的に介在されて、光源
からの照射光を感光体に対して遮光する遮光部
材と、光源が点灯された後、光源の光量が安定
するまで、遮光部材を光源と感光体との間に介
在させる駆動部材とを有することを特徴とする
除電装置。 ２ 遮光部材が、金属製の筒状体の所定位置にス
リツトを形成したものである上記実用新案登録
請求の範囲第１項記載の除電装置。 ３ 遮光部材が、合成樹脂製の筒状体の一部を光
透過部とし、残余の部分を非透過部としたもの
である上記実用新案登録請求の範囲第１項記載
の除電装置。 ４ 駆動部材がロータリーソレノイドである上記
実用新案登録請求の範囲第１項記載の除電装
置。[Claims for Utility Model Registration] 1. A static eliminator for removing residual charges on a photoreceptor, comprising a light source that is turned on prior to image formation, and a device selectively interposed between the light source and the photoreceptor, It has a light shielding member that shields the photoreceptor from the irradiation light from the light source, and a driving member that interposes the light shielding member between the light source and the photoreceptor until the light amount of the light source is stabilized after the light source is turned on. A static eliminator characterized by: 2. The static eliminator according to claim 1, wherein the light shielding member is a metal cylindrical body with slits formed at predetermined positions. 3. The static eliminator according to claim 1, wherein the light shielding member is made of a cylindrical body made of synthetic resin, with a part of the cylindrical body serving as a light transmitting part and the remaining part being a non-transmissive part. 4. The static eliminator according to claim 1, wherein the driving member is a rotary solenoid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985150672U JPH0531668Y2 (en) | 1985-09-30 | 1985-09-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985150672U JPH0531668Y2 (en) | 1985-09-30 | 1985-09-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6258473U JPS6258473U (en) | 1987-04-11 |
| JPH0531668Y2 true JPH0531668Y2 (en) | 1993-08-13 |
Family
ID=31067020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985150672U Expired - Lifetime JPH0531668Y2 (en) | 1985-09-30 | 1985-09-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0531668Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57116379A (en) * | 1981-01-12 | 1982-07-20 | Ricoh Co Ltd | Electrophotographic device |
-
1985
- 1985-09-30 JP JP1985150672U patent/JPH0531668Y2/ja not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57116379A (en) * | 1981-01-12 | 1982-07-20 | Ricoh Co Ltd | Electrophotographic device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6258473U (en) | 1987-04-11 |
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