JPS62187871A - Exposure quantity controller for copying machine or the like - Google Patents
Exposure quantity controller for copying machine or the likeInfo
- Publication number
- JPS62187871A JPS62187871A JP3057286A JP3057286A JPS62187871A JP S62187871 A JPS62187871 A JP S62187871A JP 3057286 A JP3057286 A JP 3057286A JP 3057286 A JP3057286 A JP 3057286A JP S62187871 A JPS62187871 A JP S62187871A
- Authority
- JP
- Japan
- Prior art keywords
- filter
- density
- lens array
- exposure
- focus lens
- 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.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 claims abstract description 6
- 230000007935 neutral effect Effects 0.000 claims abstract description 4
- 238000003384 imaging method Methods 0.000 claims description 5
- 230000003595 spectral effect Effects 0.000 abstract description 10
- 239000011521 glass Substances 0.000 abstract description 7
- 238000000926 separation method Methods 0.000 abstract description 4
- 230000004907 flux Effects 0.000 abstract description 2
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 6
- 108091008695 photoreceptors Proteins 0.000 description 5
- 238000003491 array Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 108010010803 Gelatin Proteins 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 229920000159 gelatin Polymers 0.000 description 1
- 239000008273 gelatin Substances 0.000 description 1
- 235000019322 gelatine Nutrition 0.000 description 1
- 235000011852 gelatine desserts Nutrition 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- ILJSQTXMGCGYMG-UHFFFAOYSA-N triacetic acid Chemical compound CC(=O)CC(=O)CC(O)=O ILJSQTXMGCGYMG-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Exposure Or Original Feeding In Electrophotography (AREA)
- Optical Systems Of Projection Type Copiers (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はカラー複写機等における露光計の調整装置に関
する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an adjustment device for an exposure meter in a color copying machine or the like.
レンズ系を用・ハたカラー複写機において露光竜を調整
する場合には、各分解光のバランスを保った状態で露光
はの調整を行う必要がある。このために、従来ではレン
ズ内に絞りを設けて全体光量の調整を行っていた。しか
しながら、レンズ内に絞りを設けるものは、短焦点レン
ズアレーの場合には適用ができず、また、セルフオフレ
ンズアレー、ＤＭＬＡ、凹面鏡等のようにその機構内に
絞り金もたない結像係に適用することができなかった。When adjusting the exposure rate in a color copying machine using a lens system, it is necessary to adjust the exposure while maintaining the balance of each separated light. For this purpose, in the past, a diaphragm was provided within the lens to adjust the overall light amount. However, devices with an aperture inside the lens cannot be applied to short-focus lens arrays, and imaging devices that do not have an aperture within their mechanism, such as self-off lens arrays, DMLA, and concave mirrors, cannot be applied to short-focus lens arrays. could not be applied.
さらに、原稿面や感光体の付近に光量検出器を配置して
レンズ内に設けた絞りを調整するような装置も提案され
ているが、回路等が複雑でコストが高い等の問題があっ
た。Furthermore, a device has been proposed in which a light intensity detector is placed near the document surface or photoconductor to adjust the aperture provided in the lens, but this device has problems such as complicated circuitry and high cost. .
そこで本発明の目的は、結像素子内に絞りを持たないカ
ラー複写機（Ｃおいて、ランプの分光分布を変更するこ
となく全体の露光叶調’ＩＩを行うことができる装置を
提供するものである。SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a color copying machine (C) which does not have an aperture in its imaging element, and which can perform overall exposure adjustment without changing the spectral distribution of the lamp. It is.
上記目的を達成するために、本発明は結ｒ象光路中に、
短焦点レンズアレー等の長手方向と直角方向に濃度勾配
を有するニュートラル・デンシティ・フィルターを、濃
度勾配方向に移動可能とするように設けた点を特徴とす
るものである。In order to achieve the above object, the present invention provides the following features:
The present invention is characterized in that a neutral density filter having a density gradient in a direction perpendicular to the longitudinal direction of a short focal length lens array or the like is provided so as to be movable in the direction of the density gradient.
（実 施 例）
以下図面を参照して従来技術と対比しつつ本発明の詳細
な説明する。(Example) The present invention will be described in detail below with reference to the drawings and in comparison with the prior art.
第１図は本発明を適用する複写機の概要ケ示すもので、
コンタクトガラス６の下方には反射板２があって、反射
板２の楕円面が形成する第１焦点上には、指向性がなく
全方向に対して均一な光束を発散する光源１０発光点が
置かれている。この光源系の第２焦点３はコンタクトガ
ラス６の下方に設置された短焦点レンズアレー８の有効
スリット９の中央にくるように設定されていて、コンタ
クトガラス６の上面に置かれた原稿７を露光する。Figure 1 shows an overview of a copying machine to which the present invention is applied.
There is a reflector 2 below the contact glass 6, and on the first focal point formed by the elliptical surface of the reflector 2, there is a light source 10 that emits a light beam that is non-directional and uniform in all directions. It has been placed. The second focal point 3 of this light source system is set to be at the center of the effective slit 9 of the short focus lens array 8 installed below the contact glass 6, and the second focal point 3 of this light source system is set to be located at the center of the effective slit 9 of the short focus lens array 8 installed below the contact glass 6. Expose.
短焦点レンズアレー８の下方には、感光ベルト５、現像
ロー２４があって、公知の態様によってコピ−１０全作
成する。A photosensitive belt 5 and a developing roller 24 are located below the short focus lens array 8, and all copies 10 are made in a known manner.
第２図は光源系を拡大して示すもので、ランプ１から全
方向に発散された光束は、反射板２の内、面を１回もし
くは数回反射して有効スリット内の第２焦点３にふたた
び集光される。FIG. 2 shows an enlarged view of the light source system. The light beam diverged in all directions from the lamp 1 is reflected once or several times on the surface of the reflector 2, and then reaches the second focal point 3 within the effective slit. The light is again focused on the
この時のコンタクトガラス６上に置かれた原稿面での露
光分布（ｒｉ、第３図に示すように、有効スリット９′
Ｊ）中央にピークを持つカーブ１２のようになる。At this time, the exposure distribution (ri) on the surface of the document placed on the contact glass 6, as shown in FIG.
J) It will look like curve 12 with a peak in the center.
白黒複写機の＠倉には、コピー濃度の調整は、ランプｌ
の電圧、もしくは現像ａ−２４のバイアスを変化させて
行うの：か一般的である。ランプ電圧を変化させること
を例にとれば、第４図に示すように、ランプ電圧を８０
Ｖ、１１０Ｖ、１５０Ｖにそれぞれ変化させた場合に、
横軸に波長ｎｍを、縦軸に相対強度％ｔとった発光分布
は、ブランクの対射則により図のようなカーブをとる。For black and white copying machines, the copy density can be adjusted using the lamp l.
It is common to perform this by changing the voltage of the developing device A-24 or the bias of the developing device A-24. For example, when changing the lamp voltage, as shown in Figure 4, the lamp voltage is changed to 80%.
V, 110V, and 150V, respectively,
The luminescence distribution, where the horizontal axis represents the wavelength nm and the vertical axis represents the relative intensity %t, takes a curve as shown in the figure according to Blank's projection law.
このときに、光学結像系内に図示しない視感度フィルタ
ーが挿入さｎているとすれば、感光ベルト５上での分光
分布（ｄ電圧変化に伴なって第５図のように変化し、エ
ネルギー強度は第６図のように変化する。すなわち、画
像濃度は第７図のように変化する。従って、第７図に清
ってランプ電圧を変化させｎば、はぼ直線的な画像濃度
の調整が可能である。At this time, if a visibility filter (not shown) is inserted into the optical imaging system, the spectral distribution on the photosensitive belt 5 (d changes as shown in FIG. 5 as the voltage changes, The energy intensity changes as shown in Fig. 6. That is, the image density changes as shown in Fig. 7. Therefore, if the lamp voltage is changed as shown in Fig. 7, the image density becomes almost linear. can be adjusted.
次に、カラー複写機において上記と同様にランプ電圧を
変化させる方式で露光量の調整を行なった場合の現象を
説明する。Next, a phenomenon occurring when the exposure amount is adjusted in a color copying machine by changing the lamp voltage in the same manner as described above will be explained.
第４図に示すような特性をもつランプｌの光源光に対し
て第８図に示す様な特性をもつ色分解フィルターを結像
光路中に介在させた場合には、感光ベルト５上での分光
分布は第９図（ａｌ、 ｆｂ）、（ｃｌに示すようにな
る。すなわち、感光ベルト５上でのエネルギー強度は第
１０図のようになり、同じ電圧変化でもＲ（赤）、Ｇ（
緑）、Ｂ（青）の三要素の変化量はＲ−）Ｇ→Ｂの順で
小さくなってしまう。When a color separation filter having the characteristics as shown in FIG. 8 is interposed in the imaging optical path for the light source light of the lamp l having the characteristics as shown in FIG. The spectral distribution becomes as shown in Fig. 9 (al, fb) and (cl). That is, the energy intensity on the photosensitive belt 5 becomes as shown in Fig. 10, and even with the same voltage change, R (red), G (
The amount of change in the three elements green) and B (blue) decreases in the order of R-)G→B.
このために、感光ベルト５の分光感度が各波長に対して
一定であるとすれば、画像濃度は第１１図のようになる
。For this reason, assuming that the spectral sensitivity of the photosensitive belt 5 is constant for each wavelength, the image density will be as shown in FIG. 11.
このことから、灰色の原稿を複写し、光源の電圧ｅ８０
Ｖで同じ灰色になるように現像バイアス４や図示しない
メインチャージを設定した状態で、光源電圧全上昇させ
た場合には、コピー上の色相は第１２図のように変化し
てしまい、黄色みがかつてきてしまう。From this, when copying a gray original, the light source voltage e80
If the developing bias 4 and the main charge (not shown) are set so that the same gray color is obtained at V, and the light source voltage is fully increased, the hue on the copy changes as shown in Figure 12, resulting in a yellowish tinge. will come once.
以上に説明したような理由により、カラー複写機では白
黒複写機のように光源電圧を調整することによる露光量
の調整は、色相の変化をもたらす不都合があった。For the reasons explained above, in color copying machines, adjusting the exposure amount by adjusting the light source voltage as in black-and-white copying machines has the disadvantage of causing a change in hue.
そこで本発明装置にふ・いては光源電圧を変化させるこ
となしに、露光量の調整金行うことができるようにした
ものである。Therefore, in the apparatus of the present invention, the exposure amount can be adjusted without changing the light source voltage.
第１３図は本発明の原理を示す第３図と同様の説明図で
あって、光源ランプｌの光束は反射板２によってコンタ
クトガラス６上の有効スリット９内に集光され、短焦点
レンズアレー８により感光ベルト５上に結像する。そし
て、短焦点Ｖンズアレー８と感光ベルト５との間には二
１−トラル・デンシティ−・フィルター（ＮＤフィルタ
ー）２０が挿入されていて、また、結像光路中には色分
解フィルター（図示せず）が設けられている。ＮＤフィ
ルター２０は、第１５図、第１６図に示すようにレンズ
アン−８の有効スリットの長手方向９ａに対して直角方
向（矢印イ）Ｋ移動可能になっている。FIG. 13 is an explanatory diagram similar to FIG. 3 showing the principle of the present invention, in which the luminous flux of the light source lamp l is focused by the reflector plate 2 into the effective slit 9 on the contact glass 6, and the short focus lens array 8 to form an image on the photosensitive belt 5. A 21-toral density filter (ND filter) 20 is inserted between the short-focus V-lens array 8 and the photosensitive belt 5, and a color separation filter (not shown) is inserted into the imaging optical path. ) is provided. As shown in FIGS. 15 and 16, the ND filter 20 is movable in a direction K perpendicular to the longitudinal direction 9a of the effective slit of the lens 8 (arrow A).
そして、ＮＤフィルター２０は、その移動方向の長さｔ
Ｖｃ沿って低濃度部２１、高濃度部２２をもつ濃度勾配
が与えられている。The ND filter 20 has a length t in its moving direction.
A concentration gradient having a low concentration portion 21 and a high concentration portion 22 is provided along Vc.
濃度勾配の与え方は、第１６図１ａｌに示すように、長
さｔ方向の移動に対して透過濃度が直線的に変化するよ
うにしであるか、又は第１６図（ｃ）に示すように段階
的に変化させてもよい。このＮＤフィルター旬は第１４
図に示すような分光特性をもち、波長に対してはほぼフ
ラツトな特性を持っている。The concentration gradient is given so that the transmitted concentration changes linearly with respect to movement in the length t direction, as shown in Fig. 16 (1al), or as shown in Fig. 16 (c). It may be changed in stages. This ND filter is the 14th.
It has the spectral characteristics shown in the figure, and has almost flat characteristics with respect to wavelength.
そこで、ＮＤフィルターＷの低濃度部２１を光路中に挿
入したときは、原稿面での分光分布は第１７図ｆａ）の
ようなものとなり、高＃度部２２を挿入したときには第
１７図（ｂｌのように変化し、Ｂ％Ｇ、Ｈの露光量の比
率を保ったままで変化させることができる。Therefore, when the low density part 21 of the ND filter W is inserted into the optical path, the spectral distribution on the document surface becomes as shown in Fig. 17 fa), and when the high density part 22 is inserted, the spectral distribution is as shown in Fig. 17 (fa). bl, and can be changed while maintaining the ratio of exposure amounts of B%G and H.
すなわち、ＮＤフィルターの移動量に応じて感光体上の
露光量は第１８図に示すように変化し、ＲｌＧ、Ｂの変
化率は一定となる。したがって、画像濃度は第１９図に
示すようになり、色相変化のない露光量調整が達成でき
る。That is, the amount of exposure on the photoreceptor changes as shown in FIG. 18 in accordance with the amount of movement of the ND filter, and the rate of change of RlG and B remains constant. Therefore, the image density becomes as shown in FIG. 19, and exposure amount adjustment without hue change can be achieved.
以上に説明した色分解フィルター及びＮＤフィルターは
、干渉フィルター、トリアセテートフィルター、ゼラチ
ンフィルター等が利用できる。As the color separation filter and ND filter described above, interference filters, triacetate filters, gelatin filters, etc. can be used.
次に、第加図に示す本発明の他の実施例においては、Ｎ
Ｄフィルター２０をドラム３０、：３１に巻きつけてお
き、このドラム加、３１の回転によってベルト上のＮＤ
フィルター田を適宜の濃度位置に制御することができる
。Next, in another embodiment of the present invention shown in FIG.
The D filter 20 is wound around the drums 30 and 31, and the rotation of the drum 31 removes the ND on the belt.
The filter field can be controlled to an appropriate concentration position.
第２１図に示す更に他の実施例においては、ＮＤフィル
ター２１’６一対のピンチローラ４０，４１で挟んでお
き、適宜位置に送り出すようにしたものである。In yet another embodiment shown in FIG. 21, the ND filter 21'6 is sandwiched between a pair of pinch rollers 40, 41 and sent out to an appropriate position.
これらのＮＤフィルターの位置調整はオペレータによる
マニュアル制御によることもできるし、またはコントロ
ールユニットによる自動制御にすることもできる。The positional adjustment of these ND filters can be manually controlled by an operator or automatically controlled by a control unit.
本発明は以上のように構成しであるので、次のような効
果を有するものである。Since the present invention is configured as described above, it has the following effects.
（１）色相変化のない良好な露光量調整が可能である。(1) Good exposure amount adjustment without hue change is possible.
（２） ランプ電圧を変化させないため、安定した画
像が得られる。(2) Stable images can be obtained because the lamp voltage does not change.
（３） レンズ内絞りを必要としないので装置を安価
に作製できる。(3) Since no diaphragm is required within the lens, the device can be manufactured at low cost.
第１図は本発明全適用する複写機の概要を示す説明図、
第２図は光源系を示す拡大図、第３図は有効スリットに
おける露光分布を示す説明図、第４図はランプ電圧と露
光強度の関係を示すグラフ、第５図は光波長と露光強度
の関係を示すグラフ、第６図はランプ電圧と感光ベルト
上での露光強度の関係を示すグラフ、第７図はランプ電
圧と画像濃度の関係を示すグラフ、第８図は光波長と透
過率の関係を示すグラフ、第９図１ａｌ （ｂ）ｆｃｌ
は光波長と感光体上の分光分布の関係を示すグラフ、第
１０図はランプ電圧と感光ベルト上のエネルギー強度の
関係を示すグラフ、第【１図はランプ電圧と画像濃度の
関係を示すグラフ、第１２図はランプ電圧と色相の関係
を示すグラフ、第１３図は本発明の露光装置を示す説明
図、第１４図はフィルターの特性を示すグラフ、第１５
図はンンズアＶ−とＮＤフィルター、との関係を示す斜
睨図、第１６図１ａ）、ｆｂ）、ｆｃ）はＮＤフィルタ
ーの特性を示す説明図、第１７図ｆａ） （ｂ） ’ｔ
ｉＮＤフィルターによる分光分布を示すグラフ、第１８
図はＮＤフィルターの移動量と感光体上の露光計との関
係を示すグラフ、第１９図はＮＤフィルターの移動量と
画像濃度の関係を示すグラフ、第美図はＮＤフィルター
の移動装置の実施例を示す説明図、第２１図はＮＤフィ
ルターの移動装置の他の実施例を示す説明図、である。
１・・・光源ランプ
２・・・反射板
３・・・第２焦点
４・・・現像ローラ
５・・・感光ベルト
６・・・コンタクトガラス
９・・・有効スリット
１２．１２ａ・・・露光分布
２０・・・ＮＤフィルター
２１・・・低濃度部
こ・・・高濃度部
３０．３１・・・ＮＤフィルター巻取りドラム４０．４
１・・・ピンチローラ。FIG. 1 is an explanatory diagram showing an outline of a copying machine to which the present invention is fully applied;
Figure 2 is an enlarged view showing the light source system, Figure 3 is an explanatory diagram showing the exposure distribution in the effective slit, Figure 4 is a graph showing the relationship between lamp voltage and exposure intensity, and Figure 5 is a graph showing the relationship between light wavelength and exposure intensity. Figure 6 is a graph showing the relationship between lamp voltage and exposure intensity on the photoreceptor belt. Figure 7 is a graph showing the relationship between lamp voltage and image density. Figure 8 is a graph showing the relationship between light wavelength and transmittance. Graph showing the relationship, Figure 9 1al (b) fcl
is a graph showing the relationship between light wavelength and spectral distribution on the photoreceptor, Figure 10 is a graph showing the relationship between lamp voltage and energy intensity on the photoreceptor belt, and Figure 1 is a graph showing the relationship between lamp voltage and image density. , FIG. 12 is a graph showing the relationship between lamp voltage and hue, FIG. 13 is an explanatory diagram showing the exposure apparatus of the present invention, FIG. 14 is a graph showing filter characteristics, and FIG.
The figure is a perspective view showing the relationship between Nzua V- and the ND filter, Figure 16 1a), fb), fc) is an explanatory diagram showing the characteristics of the ND filter, and Figure 17 fa) (b) 't
Graph showing spectral distribution by iND filter, No. 18
The figure is a graph showing the relationship between the amount of movement of the ND filter and the exposure meter on the photoreceptor, Figure 19 is a graph showing the relationship between the amount of movement of the ND filter and image density, and the second figure is the implementation of the ND filter moving device. FIG. 21 is an explanatory diagram showing another embodiment of the ND filter moving device. 1...Light source lamp 2...Reflector 3...Second focal point 4...Developing roller 5...Photosensitive belt 6...Contact glass 9...Effective slit 12.12a...Exposure Distribution 20...ND filter 21...Low density part...High density part 30.31...ND filter winding drum 40.4
1...Pinch roller.
Claims (1)
光ベルト上に結像させ、静電潜像を作る光学系の結像光
路中に、短焦点レンズアレー等の長手方向と直角方向に
濃度勾配を有するニュートラル・デンシティ・フィルタ
ーを、濃度勾配方向に移動可能とするよう設けたことを
特徴とする複写機等の露光量調節装置。1. The reflected light of the original is imaged onto the photosensitive belt by a short focus lens array, etc., and the concentration is created in the imaging optical path of the optical system that creates an electrostatic latent image in the direction perpendicular to the longitudinal direction of the short focus lens array. 1. An exposure amount adjustment device for a copying machine, etc., characterized in that a neutral density filter having a gradient is provided so as to be movable in the direction of the density gradient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3057286A JPS62187871A (en) | 1986-02-14 | 1986-02-14 | Exposure quantity controller for copying machine or the like |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3057286A JPS62187871A (en) | 1986-02-14 | 1986-02-14 | Exposure quantity controller for copying machine or the like |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62187871A true JPS62187871A (en) | 1987-08-17 |
Family
ID=12307559
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3057286A Pending JPS62187871A (en) | 1986-02-14 | 1986-02-14 | Exposure quantity controller for copying machine or the like |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62187871A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2728085A1 (en) * | 1994-12-08 | 1996-06-14 | Eastman Kodak Co | SYSTEM AND METHOD FOR CONTROLLING THE EXPOSURE PROFILE OF A FINGER FADE IN A FILM CINEMATOGRAPHIC FILM |
-
1986
- 1986-02-14 JP JP3057286A patent/JPS62187871A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2728085A1 (en) * | 1994-12-08 | 1996-06-14 | Eastman Kodak Co | SYSTEM AND METHOD FOR CONTROLLING THE EXPOSURE PROFILE OF A FINGER FADE IN A FILM CINEMATOGRAPHIC FILM |
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