JPS5879206A - Image-forming lens for copying machine - Google Patents

Image-forming lens for copying machine

Info

Publication number
JPS5879206A
JPS5879206A JP17790281A JP17790281A JPS5879206A JP S5879206 A JPS5879206 A JP S5879206A JP 17790281 A JP17790281 A JP 17790281A JP 17790281 A JP17790281 A JP 17790281A JP S5879206 A JPS5879206 A JP S5879206A
Authority
JP
Japan
Prior art keywords
lens
lenses
filter
image
forming
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
Application number
JP17790281A
Other languages
Japanese (ja)
Inventor
Rokuro Watabe
渡部 六郎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP17790281A priority Critical patent/JPS5879206A/en
Publication of JPS5879206A publication Critical patent/JPS5879206A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • G02B13/24Optical objectives specially designed for the purposes specified below for reproducing or copying at short object distances

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Filters (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)

Abstract

PURPOSE:To reduce the costs of production by using at least one piece of combined lenses, forming a multilayered film filter of regulated color sensitivity on the adhered surface of the combined lenses and forming these to one body, thereby forming the multilayered film filter with soft coating. CONSTITUTION:This invention relates to an image-forming lens 4 for copying macines using a selenium photoreceptor 7 or the like. An image-forming lens 4 is obtained by combining two sets of combined lenses 40, 41 and two sets of single lenses 42, 43. The combined lenses 40, 41 consist of two pieces of lenses 40A, 40B and 41A, 41B, and have adhered surfaces A, B. For example, ZnS or the like is soft-coated as a color sensitivity regulated filter F on the surface A. Since the filter is provided on the combined surfaces of the lenses in such a way, the need for hard coating is eliminated and the efficiency of production is improved.

Description

【発明の詳細な説明】 この発明は、複奪機用結像レンズに関する。[Detailed description of the invention] The present invention relates to an imaging lens for a copier.

(発明の背景) 複写機に用いられる感光体には、一般に、感光材料に応
じて、ある種の色の光に対し感度を有し。
(Background of the Invention) Photoreceptors used in copying machines generally have sensitivity to light of a certain color depending on the photosensitive material.

又は有しないという゛感色特性があり、このために、原
稿上の特定の色の情報が複写されないという問題がある
However, there is a problem that information of a specific color on a document cannot be copied.

例えば、電子複写機の感光体として良(知らねているセ
レン感光体は、青色光に対して良い感度を有するので、
原稿上のf色画像は複写されにくい。また、セレン感光
体は、波長800〜900 nmの赤外領域の光にも、
ある程度の感度を有するので、セレン感光体と組合せて
、上記赤外領域に太きな発光エネルギーを有するハロゲ
ンランプを。
For example, the selenium photoreceptor is good as a photoreceptor for electronic copying machines, as it has good sensitivity to blue light.
An f-color image on a document is difficult to copy. Furthermore, the selenium photoreceptor is sensitive to light in the infrared region with a wavelength of 800 to 900 nm.
Since it has a certain degree of sensitivity, it is combined with a selenium photoreceptor to use a halogen lamp that emits a large amount of energy in the infrared region.

原稿照明用に用いると、赤色画像の・複写も困難である
When used for document illumination, it is difficult to copy red images.

このような問題を解決する方法とむて、感光体の感色特
性や原稿照明光源の分光発光特性に応じたフィタターを
画像露光光路中に配備するという方法が行なわ、′に1
ている。例えは、上述のセレン感光体とハロゲンランプ
の組合せの場合にあっては。
One way to solve these problems is to install a filter in the image exposure optical path according to the color sensitivity characteristics of the photoreceptor and the spectral emission characteristics of the document illumination light source.
ing. For example, in the case of the above-mentioned combination of selenium photoreceptor and halogen lamp.

画像露光光路中に、青色光と赤外光とをカットするよう
なフィルターを配備することによって1.原稿上の青色
画像や、赤色画像をも良好に複写することができる。
By providing a filter that cuts blue light and infrared light in the image exposure optical path, 1. Even blue images and red images on a document can be copied well.

多層膜フィルターは、所望の分光透過率特性を容易に得
ることができること、透過率、遮光率が極めて高いこと
等の特長により、上述の如き感色( 性調整用のフィルターとして極めて適している。・また
、このような、多層膜フィルターを、結像レンズのレン
ズ系を構成するレンズのレンズ面ニ蒸着形成することが
提案されている。このように、結像レンズを構成するレ
ンズのひとつの、レンズ面に多層膜フィルターを形成す
わば、フィルターの形成面積が小さくてすむという利点
がある。
Multilayer film filters are extremely suitable as filters for adjusting color sensitivity as described above, due to their features such as being able to easily obtain desired spectral transmittance characteristics and having extremely high transmittance and light shielding rate.・Also, it has been proposed to form such a multilayer film filter by vapor deposition on the lens surface of the lens that makes up the lens system of the imaging lens. Forming a multilayer filter on the lens surface has the advantage that the area for forming the filter can be small.

しかしながら、このような多層膜フィルターは。However, such multilayer filters.

従来、レンズの、直接空気にふねる面に形成されていた
ので、所謂ノ・−トコ−ティングによって丈夫な膜を形
成する必要があり、そのため、真空蒸着装置に基板加熱
機構を必要とするなど、蒸着装置として高価なものを必
要とし、また、ノ・−Fコーティングの技術自体も難し
いため、膜形成時間に長時間を要し、結像レンズ製造の
効率が悪かった。
Conventionally, since it was formed on the surface of the lens that is exposed to the air directly, it was necessary to form a durable film by so-called no-to coating, which required a substrate heating mechanism in the vacuum evaporation equipment. However, since an expensive vapor deposition apparatus is required, and the NO-F coating technique itself is difficult, it takes a long time to form the film, and the efficiency of manufacturing the imaging lens is low.

(目  的) そこで1本発明は、このような問題を解決した。(the purpose) Therefore, the present invention has solved such problems.

複写機用結像レンズの提供を目的とす、る。The purpose is to provide imaging lenses for copying machines.

(構 成) 本発明による複写機用結像レンズは、透過型でありて、
少なくともひとつの張合せレンズを鳴し。
(Structure) The imaging lens for a copying machine according to the present invention is of a transmission type, and includes:
Ring at least one laminated lens.

多層膜フィルターは、し、ンズ系内における。この張合
せレンズのレンズ接着面に形成されている。
Multilayer filters are used in lens systems. It is formed on the lens adhesive surface of this laminated lens.

(具体例に一即した説明) 以下、具体例に即して説明する。(Explanation based on specific examples) A specific example will be explained below.

矛1図は、複写機の1例を示している。図中、符号1は
原稿載置ガラス、符号2,3,5.6はミ:−−符号4
は結像レンズ、符号7は感光体、符号8は照明光源を、
略示している。
Figure 1 shows an example of a copying machine. In the figure, numeral 1 is the document placement glass, numerals 2, 3, 5.6 are mirrors: -- numeral 4
is an imaging lens, 7 is a photoreceptor, 8 is an illumination light source,
It is shown briefly.

原稿を原稿載置ガラスl上に定置し、照明光源8を発光
させ、感光体7を矢印方向へ回転させつつ、ミラー2を
矢印方向へ移動させて原稿Z′走査し′、同時ニミラー
3を、ミラー2の移動速度の1/2の移動速度で変位さ
せれば、感光体1を、原稿光像で画像露光することがで
きる。もぢδん。
The original is placed on the original placing glass l, the illumination light source 8 is turned on, the photoreceptor 7 is rotated in the direction of the arrow, and the mirror 2 is moved in the direction of the arrow to scan the original Z'. , the photoreceptor 1 can be image-exposed with a light image of the original by displacing the mirror 2 at a moving speed that is 1/2 of the moving speed of the mirror 2. Mojin δ.

照明光源8はミラー2と一体的に移動する。The illumination light source 8 moves integrally with the mirror 2.

透過・型の結像レンズ4 &’J 、例えは、〕・2図
に示”す如き縦断端面な有するレンズ系であって、2組
の張合せレンズ40.41.2.pの単レンズ42゜4
3  を有している。
A transmission type imaging lens 4 &'J, for example, is a lens system having a vertical cross-sectional end surface as shown in Figure 2, and is a single lens consisting of two sets of laminated lenses 40.41.2.p. 42°4
It has 3.

張合せレンズ40は、レンズ40A、40Bを接着面A
で接着してなり、張合せレンズ41は、レンズ41A、
  41Bを接着面Bで接着してなっている。
In the laminated lens 40, the lenses 40A and 40B are attached to the adhesive surface A.
The bonded lens 41 consists of lenses 41A,
41B is bonded with adhesive surface B.

さて、説明の具体性のため、感光体7をセレン感光体と
し、照明光源8におけるランプをノ・ロゲンランプであ
るとしよう。
For the sake of concreteness, let us assume that the photoreceptor 7 is a selenium photoreceptor and that the lamp in the illumination light source 8 is a nitrogen lamp.

セレン感光体は、矛、3図に実線で示す如き感色特性を
有し、ノ・ロゲンランプの発光エネルギーの分光特性は
、同図中の一点鎖線で示す如きもの”である。
The selenium photoreceptor has color-sensing characteristics as shown by the solid line in Figure 3, and the spectral characteristics of the emission energy of the nitrogen lamp are as shown by the dashed-dotted line in the same figure.

このような取合せにおいて、原稿上の青色画像。In such an arrangement, the blue image on the manuscript.

赤色画像をも良好に複写し5るためには、矛4図に示す
ごとき分光透過率特性を有する多層膜フィルターを形成
する必要がある。
In order to copy red images satisfactorily, it is necessary to form a multilayer filter having spectral transmittance characteristics as shown in Figure 4.

このような多層膜フィルターFは、結像レンズ4の、レ
ンズ接着面Aに形成6hている。このよ5K”jるには
、レンズ40Aの、上記接着面となる凹面に、I多層膜
フイ、ルターFをソフト、コー、テイシクシ、その後、
レンズ40Aと40Bとを接着して張合セねば良い。な
お従来は、単レンズ42又は43の凹面C又はDK多層
膜フィルターをノ・−トコ−ティングしていた。もちろ
ん、多層膜フィルターを。
Such a multilayer filter F is formed 6h on the lens adhesive surface A of the imaging lens 4. To achieve this 5K, apply I multilayer film and Luther F to the concave surface of the lens 40A, which will serve as the adhesive surface, and then apply
The lenses 40A and 40B should be bonded together. Conventionally, the concave C or DK multilayer filter of the single lens 42 or 43 was coated with a note. Of course, a multilayer filter.

接着面Bに形成してもよい。It may also be formed on the adhesive surface B.

なお、多層膜フィルターの形成をレンズの凹面に行なう
のは、凸面に形成する場合に比して、容易に膜厚のむら
の少いものを得ることかできるからである。
The reason why the multilayer filter is formed on the concave surface of the lens is that it is easier to obtain a film with less unevenness in thickness than when it is formed on the convex surface.

さて、以下に、上gヒ実施例の場合にづいて1本発明に
よる効果を、従来技術との比較によって説明する。
Now, in the case of the above-mentioned embodiment, the effects of the present invention will be explained below by comparison with the prior art.

(・5までもなく、本発明にあっては、多層膜フィルタ
ーは、レンズ接着面に形成されるので、多層膜フィルタ
ーが、むき出しにさらさねることはなく、そのため、こ
の多層膜フィルターをソフトコーティングで行なうこと
ができる。
(Needless to say, in the present invention, the multilayer filter is formed on the adhesive surface of the lens, so the multilayer filter is not exposed to the naked eye. Therefore, the multilayer filter is coated with a soft coating. It can be done with

ソフトコーティングにおいては、前述の如く。As for soft coating, as mentioned above.

蒸着装置において基板加熱機構が不要である。従って、
多層膜フィルターを、より安価な蒸着装置で形成できる
ことになるも基板加熱機構のない蒸着装装置のコストは
、同機構を有する。装置の2//38度ですむ。また、
ソフトコーティングの場合は。
A substrate heating mechanism is not required in the vapor deposition apparatus. Therefore,
Although the multilayer film filter can be formed using a cheaper vapor deposition apparatus, the cost of the vapor deposition apparatus without a substrate heating mechanism is lower than that of a vapor deposition apparatus with the same mechanism. The temperature of the device is 2//38 degrees. Also,
For soft coating.

ハードコーティングの場合に比して、処理時間が1/3
程度短縮可能であり1作業能率もよい。
Processing time is 1/3 compared to hard coating
It can be shortened to a certain extent, and the work efficiency is also good.

また、ソフトコーティングでは、多層膜フィルターの材
料として、ZnS * MgF2  を用いるが、こわ
ら蒸着物質は、屈折率が安定しているため、光学的膜厚
のコントロールが容易であり、設計値に忠実な分光透過
特性を有するフィルターを得ることか容易である。
In addition, in soft coating, ZnS*MgF2 is used as the material for the multilayer film filter, but the stiff evaporated material has a stable refractive index, so it is easy to control the optical film thickness, and it is possible to adhere to the design value. It is easy to obtain a filter with good spectral transmission characteristics.

こわに対し、ハードコーティングにおいては。In contrast to stiffness, in hard coating.

蒸着物質としてTiO2、5i02が用いられるが′、
こわらは、屈折率が不安定であって、光学的膜厚のコン
トロールが難しく、吃計値に忠実なものを得るには高度
な技術が必要とされる。
TiO2, 5i02 is used as a deposition material.
The refractive index of the stiff film is unstable, making it difficult to control the optical film thickness, and advanced technology is required to obtain a value that is faithful to the measured value.

(効  果) このように1本発明によりば、多層膜フィルターヲソフ
トコーティングで形成しうるため、゛結像レンズ9製造
工程が容易となり、製造、能率も効上し、コストも低減
化することができる。
(Effects) As described above, according to the present invention, since the multilayer filter can be formed by soft coating, the manufacturing process of the imaging lens 9 is facilitated, the manufacturing efficiency is improved, and the cost is reduced. I can do it.

【図面の簡単な説明】[Brief explanation of drawings]

のみ略示する正面図、矛2図は、本発明の1・実施例を
説明するための縦断端面図、5−3mおよび矛4図は1
本発明を説明するための図である。 4・・・透過型の結像レンズ、40.41・・・張合せ
しくズ、A、B・・・レンズ接着面、F・・・啓層膜フ
ィルター
Figure 2 is a longitudinal cross-sectional end view for explaining the first embodiment of the present invention, and Figures 5-3m and 4 are schematic front views.
FIG. 2 is a diagram for explaining the present invention. 4...Transmission type imaging lens, 40.41...Launching mechanism, A, B...lens adhesive surface, F...layer film filter

Claims (1)

【特許請求の範囲】 複写すべき為稿の光像1を感光体上に結像、させるため
の結像レンズ大あって。 透過型であり、少くともひとつの張合せレンズを有し、 感色性を調整するための多層膜フィルターを、レンズ系
内におけるレンズ接着面に形成したことを特徴とする。 複写機用結像レンズ。
[Claims] There is an imaging lens for forming a light image 1 of a document to be copied onto a photoreceptor. It is a transmission type, has at least one laminated lens, and is characterized by having a multilayer filter for adjusting color sensitivity formed on the lens adhesive surface within the lens system. Imaging lens for copying machines.
JP17790281A 1981-11-06 1981-11-06 Image-forming lens for copying machine Pending JPS5879206A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17790281A JPS5879206A (en) 1981-11-06 1981-11-06 Image-forming lens for copying machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17790281A JPS5879206A (en) 1981-11-06 1981-11-06 Image-forming lens for copying machine

Publications (1)

Publication Number Publication Date
JPS5879206A true JPS5879206A (en) 1983-05-13

Family

ID=16039054

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17790281A Pending JPS5879206A (en) 1981-11-06 1981-11-06 Image-forming lens for copying machine

Country Status (1)

Country Link
JP (1) JPS5879206A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62204276A (en) * 1986-03-05 1987-09-08 Canon Inc Recorder
WO2020084264A1 (en) * 2018-10-25 2020-04-30 Safran Electronics & Defense Optical component with filter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62204276A (en) * 1986-03-05 1987-09-08 Canon Inc Recorder
WO2020084264A1 (en) * 2018-10-25 2020-04-30 Safran Electronics & Defense Optical component with filter
FR3087903A1 (en) * 2018-10-25 2020-05-01 Safran Electronics & Defense OPTICAL FILTER COMPONENT

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