JP2730002B2 - Original illumination lamp - Google Patents
Original illumination lampInfo
- Publication number
- JP2730002B2 JP2730002B2 JP1243473A JP24347389A JP2730002B2 JP 2730002 B2 JP2730002 B2 JP 2730002B2 JP 1243473 A JP1243473 A JP 1243473A JP 24347389 A JP24347389 A JP 24347389A JP 2730002 B2 JP2730002 B2 JP 2730002B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- interference film
- optical interference
- multilayer optical
- vapor deposition
- 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 - Fee Related
Links
Landscapes
- Exposure Or Original Feeding In Electrophotography (AREA)
- Light Sources And Details Of Projection-Printing Devices (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、電子写真複写機の原稿照明装置に使用され
るランプに関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lamp used for an original illuminating device of an electrophotographic copying machine.
電子写真複写機の原稿照明装置は、管形をしたハロゲ
ンランプによって原稿面を帯状に照明した状態でスキャ
ンし、その反射光をレンズ系などを介して感光体が塗布
された感光ドラムに照射して結像させる。このとき、感
光体を均一な配光分布で照射する必要があるので、原稿
照明用ランプは、発光部と非発光部を所定間隔で交互に
配置したフィラメントを使用して両端部の光量が大きな
所定曲線の配光分布が得られるようにしている。従っ
て、発光は発光部と光発光部の境界で不連続になり、配
光曲線には、リップルと称する小さな波ができて滑らか
な曲線にならない。このため、ランプの封体表面にサン
ドブラストによってフロスト加工を施し、散光性を付与
してリップルを解消している。The original illuminating device of an electrophotographic copying machine scans a document while the original surface is illuminated in a band shape by a tube-shaped halogen lamp, and irradiates the reflected light to a photosensitive drum coated with a photoreceptor through a lens system or the like. To form an image. At this time, since it is necessary to irradiate the photosensitive member with a uniform light distribution, the document illumination lamp uses a filament in which light-emitting portions and non-light-emitting portions are alternately arranged at predetermined intervals, and the light amount at both ends is large. A light distribution of a predetermined curve is obtained. Therefore, the light emission becomes discontinuous at the boundary between the light emitting portion and the light emitting portion, and the light distribution curve has a small wave called a ripple and does not become a smooth curve. For this reason, frost processing is performed on the surface of the envelope of the lamp by sandblasting to impart light scattering properties and eliminate ripples.
ところで、感光ドラム上に塗布される感光体として
は、有機感光体（OPC）、セレン−ヒ素感光体（SeA
s）、セレン−テルル感光体（SeTe）などがよく使用さ
れるが、これらの感光体はそれぞれ特有の分光感度特性
を有しており、原稿の文字や図形の色が、使用されてい
る感光体の感度の高い波長帯の色であれば、その色の文
字や図形を鮮明に複写することができない。例えば、As
Seなどよりなるセレン系感光体は、550〜700nmの波長帯
に分光感度特性のピークがあるので、印鑑による朱色の
印影は鮮明に複写することができず、As2Se3あるいはSe
Teよりなるセレン系感光体は、400〜550nmの波長帯に分
光感度特性のピークがあり、グラフ用紙の青色の罫線は
ほとんど複写されない。このため従来は、感光体に至る
光路中にフィルターを介装し、感光体の感度の高い波長
帯の色を抑制している。つまり、赤色の波長帯に分光感
度特性のピークがある感光体の場合は青色のフィルター
を使用して赤色の文字や図茗溪を鮮明に複写できるよう
にし、青色の波長帯に分光感度特性のピークがある感光
体の場合は赤色のフィルターを使用して青色の文字や図
形を鮮明に複写できるようにしている。By the way, as the photoconductor applied on the photoconductor drum, an organic photoconductor (OPC) and a selenium-arsenic photoconductor (SeA
s), selenium-tellurium photoreceptor (SeTe), etc. are often used. These photoreceptors each have a specific spectral sensitivity characteristic, and the color of the characters and figures of the original is determined by the photosensitivity used. If the color is in the wavelength range of high body sensitivity, characters and figures of that color cannot be copied clearly. For example, As
A selenium-based photoreceptor made of Se or the like has a spectral sensitivity characteristic peak in a wavelength band of 550 to 700 nm, so a vermilion imprint by a seal cannot be clearly copied, and As 2 Se 3 or Se 2
The selenium-based photoreceptor made of Te has a spectral sensitivity characteristic peak in the wavelength band of 400 to 550 nm, and the blue ruled line on graph paper is hardly copied. For this reason, conventionally, a filter is interposed in the optical path leading to the photoreceptor to suppress colors in a wavelength band where the photoreceptor has high sensitivity. In other words, if the photoreceptor has a spectral sensitivity characteristic peak in the red wavelength band, use a blue filter to enable the clear copying of red characters and figure Mykeikei, and a spectral sensitivity characteristic peak in the blue wavelength band. Some photoreceptors use a red filter to enable clear copying of blue characters and graphics.
しかしながら、フィルターは、高価であり、耐熱性が
劣るとともに、ほこりなどが付着しやすいために取り扱
いにくいが、更にはフィルター取付部材が必要になって
部品点数が多くなり、重量も増加する不具合がある。こ
のため、フィルターを使用せずに、ランプの封体の外表
面に特定波長域の光を反射する多層光干渉膜を形成する
ことが試みられているが、多層光干渉膜を形成した封体
にサンドブラストによってサンド粒子をショットすると
多層光干渉膜が破壊されてしまうので、フロスト加工を
施すことができない。従って、かかるランプは散光性が
ほとんどなく、配光曲線にリップルが生じる不具合があ
った。However, filters are expensive, have poor heat resistance, and are difficult to handle because dust and the like are apt to adhere to them, but furthermore, a filter mounting member is required, so that the number of parts increases and the weight increases. . For this reason, it has been attempted to form a multilayer optical interference film that reflects light in a specific wavelength range on the outer surface of the lamp envelope without using a filter. When sand particles are shot by sand blasting, the multilayer optical interference film is destroyed, so that frost processing cannot be performed. Therefore, such a lamp has almost no light-scattering property, and there is a problem that a ripple occurs in a light distribution curve.
そこで本発明は、封体の外表面に特定波長域の光を反
射する多層光干渉膜を形成してフィルターが不要である
にもかかわらず、簡単な方法で散光性を持たせることが
できる原稿照明用ランプを提供することを目的とするも
のである。Therefore, the present invention provides a multi-layer optical interference film that reflects light in a specific wavelength range on the outer surface of an envelope to provide a light diffusing property by a simple method despite the fact that a filter is not required. It is an object to provide a lighting lamp.
本発明の原稿照明用ランプは、石英ガラス製の封体の
外表面に、先ず特定波長域の光を反射する多層光干渉膜
が蒸着法により形成され、この多層光干渉膜の外表面
に、MgF2、ZnS、SiO2などからなる微小な凹凸を有する
白色系統の散光性薄膜が同じく蒸着法により形成された
ことを特徴とするものである。In the document illumination lamp of the present invention, a multilayer optical interference film that reflects light in a specific wavelength range is first formed on the outer surface of a quartz glass envelope by a vapor deposition method, and on the outer surface of the multilayer optical interference film, A white light-scattering thin film having minute unevenness made of MgF 2 , ZnS, SiO 2 or the like is similarly formed by a vapor deposition method.
すなわち、多層光干渉膜の外表面に形成された微小な
凹凸を有する白色系統の散光性薄膜によって光が拡散
し、多層光干渉膜を破壊することなくランプに散光性を
付与できるので、フィルターが不要であって、配光曲線
のリップルも解消される。そして、この白色系統の散光
性薄膜も多層光干渉膜と同じく蒸着法により形成される
ので、両方の膜を同じ蒸着装置で形成でき、膜の形成工
程が簡単になる利点がある。That is, light is diffused by a white light-scattering thin film having fine irregularities formed on the outer surface of the multilayer light interference film, and light can be imparted to the lamp without destroying the multilayer light interference film. It is unnecessary and the ripple of the light distribution curve is also eliminated. Since the white light-scattering thin film is also formed by the vapor deposition method as in the case of the multilayer optical interference film, both films can be formed by the same vapor deposition apparatus, and there is an advantage that the film forming process is simplified.
以下に図面に示す実施例に基いて本発明を具体的に説
明する。Hereinafter, the present invention will be specifically described based on embodiments shown in the drawings.
第１図において、管形をした石英ガラス製の封体１の
両端にピンチシール部２が形成され、このピンチシール
部２にモリブデン箔３が埋設されている。封体１の管軸
に沿って保持されたフィラメント４は、発光部41と非発
光部42が交互に配置されたものであるが、発光部41はタ
ングステン素線をコイルに巻回したものであり、非発光
部42は、両端にリングを有するサポータ５で構成されて
いる。フィラメント４の両端から伸びた素線がモリブデ
ン箔３に溶接されるとともに、外部リード６もモリブデ
ン箔３に溶接されて外に伸び出している。そして、第２
図に示すように、封体１の外表面には多層光干渉膜７が
蒸着法によりコーティングされ、更に多層光干渉膜７の
表面に微小な凹凸を有する白色系統の散光性薄膜８が同
じく蒸着法によりコーティングされている。In FIG. 1, a pinch seal portion 2 is formed at both ends of a tubular quartz glass envelope 1, and a molybdenum foil 3 is embedded in the pinch seal portion 2. The filament 4 held along the tube axis of the envelope 1 has light emitting portions 41 and non-light emitting portions 42 arranged alternately. The light emitting portion 41 is formed by winding a tungsten wire around a coil. In addition, the non-light-emitting portion 42 includes the supporter 5 having rings at both ends. The wires extending from both ends of the filament 4 are welded to the molybdenum foil 3, and the external leads 6 are also welded to the molybdenum foil 3 and extend outward. And the second
As shown in the figure, a multilayer light interference film 7 is coated on the outer surface of the envelope 1 by a vapor deposition method, and a white light-scattering thin film 8 having minute irregularities on the surface of the multilayer light interference film 7 is also vapor deposited. It is coated by the method.
多層光干渉膜７は、感光体の分光感度特性に応じて特
定波長域の光を反射する特性を有する。例えば、550〜7
00nmの波長帯に分光感度特性のピークがあるAsSeよりな
るセレン系感光体を使用するときは、この波長帯を反射
する特性を有する。従って、本発明のランプを使用すれ
ば、原稿の文字や図形の色にかかわらず鮮明に複写で
き、フィルターは不要である。The multilayer light interference film 7 has a characteristic of reflecting light in a specific wavelength range according to the spectral sensitivity characteristic of the photoconductor. For example, 550-7
When a selenium-based photoreceptor made of AsSe having a spectral sensitivity characteristic peak in the wavelength band of 00 nm is used, it has a characteristic of reflecting this wavelength band. Therefore, if the lamp of the present invention is used, clear copying can be performed irrespective of the color of the characters and figures of the document, and no filter is required.
次に、550〜700nmの波長帯を反射する多層光干渉膜
（赤色反射多層光干渉膜）および400〜550nmの波長帯を
反射する多層光干渉膜（青色反射多層光干渉膜）の具体
例を示すと、赤色反射多層光干渉膜は、TiO2とSiO2の薄
膜を、第２図に示すように、交互に６層形成したもので
あり、膜厚は、第６層のSiO2以外が0.16μｍ、第６層の
SiO2が0.08μｍである。そして、分光反射特性は第３図
（Ａ）に示す通りである。また、青色反射多層光干渉膜
も、TiO2とSiO2の薄膜を交互に６層形成したものであ
り、膜厚は、第６層のSiO2と第１層のTiO2が0.06μｍ、
その他が0.12μｍである。そして、分光反射特性は第３
図（Ｂ）に示す通りである。Next, specific examples of the multilayer optical interference film that reflects the wavelength band of 550 to 700 nm (red reflective multilayer optical interference film) and the multilayer optical interference film that reflects the wavelength band of 400 to 550 nm (blue reflective multilayer optical interference film) will be described. When shown, the red reflecting multilayer optical interference film, a thin film of TiO 2 and SiO 2, as shown in FIG. 2, which has formed six layers alternately, film thickness, other than SiO 2 of the sixth layer 0.16μm, 6th layer
SiO 2 is 0.08 μm. The spectral reflection characteristics are as shown in FIG. Also, blue reflecting multilayer optical interference film is obtained by forming 6 layers of thin films of TiO 2 and SiO 2 alternately, film thickness, sixth layer of SiO 2 and the first layer of TiO 2 is 0.06 .mu.m,
The others are 0.12 μm. And the spectral reflection characteristic is the third
This is as shown in FIG.
次に、表面に微小な凹凸を有する白色系統の散光性薄
膜８は、多層光干渉膜７の上にMgF2やZnSあるいはSiO2
などを同じく蒸着法でコーティングしたものであるが、
蒸着装置内の真空度が多層光干渉膜７の場合よりも低い
真空度で行うので、結晶粒の粒径が１μｍ〜５μｍ程度
の大きなものになって膜厚が８μｍ程度に形成される。
つまり、多層光干渉膜７を形成するときは、10-4Torr程
度の真空度で行うが、散光性薄膜８の場合は10-3Torr程
度の真空度で行う。その結果、蒸着装置内のガスと蒸着
分子の衝突が活発化し、平均自由行程が変化するので、
散光性薄膜８の表面が凹凸化し、散光性が付与される。
また、多層光干渉膜７と同じく蒸着法でコーティングす
るので、このコーティング過程で多層光干渉膜７が破壊
されることはなく、かつ同一の蒸着装置を使用して多層
光干渉膜７および散光性薄膜８を蒸着できる利点があ
る。Next, a white light-scattering thin film 8 having fine irregularities on the surface is coated on the multilayer optical interference film 7 with MgF 2 , ZnS or SiO 2.
Etc. are also coated by vapor deposition method,
Since the degree of vacuum in the vapor deposition apparatus is lower than that in the case of the multilayer optical interference film 7, the crystal grains have a large diameter of about 1 μm to 5 μm and are formed to have a thickness of about 8 μm.
That is, when the multilayer optical interference film 7 is formed, the degree of vacuum is about 10 −4 Torr, but in the case of the light-scattering thin film 8, the degree of vacuum is about 10 −3 Torr. As a result, the collision between the gas in the vapor deposition device and the vaporized molecules is activated, and the mean free path changes,
The surface of the light-scattering thin film 8 becomes uneven, and light-scattering properties are imparted.
Further, since the coating is performed by the vapor deposition method similarly to the multilayer optical interference film 7, the multilayer optical interference film 7 is not destroyed in this coating process, and the multilayer optical interference film 7 and the light scattering There is an advantage that the thin film 8 can be deposited.
しかして、かかる構成の実施例のランプおよび散光性
薄膜８をコーティングしない比較例のランプを点灯して
それぞれ配光分布曲線を求めたが、実施例のランプは、
第４図（Ａ）に示すように、リップルのほとんどない滑
らかな曲線であった。これに対して、比較例のランプ
は、第４図（Ｂ）に示すように、多くのリップルが認め
られ、散光性薄膜８の効果が大きいことが確認できた。Thus, the lamp of the embodiment having such a configuration and the lamp of the comparative example not coated with the light-diffusing thin film 8 were turned on to obtain light distribution curves, respectively.
As shown in FIG. 4 (A), the curve was a smooth curve with almost no ripple. On the other hand, in the lamp of the comparative example, as shown in FIG. 4B, many ripples were recognized, and it was confirmed that the effect of the light-scattering thin film 8 was large.
以上説明したように、本発明の原稿照明用ランプは、
封体の外表面に蒸着法により形成された特定波長域の光
を反射する多層光干渉膜の外表面に、微小な凹凸を有す
る白色系統の散光性薄膜を同じく蒸着法で形成したの
で、フィルターが不要な原稿照明用ランプに、簡単な方
法で散光性を持たせることができる。As described above, the document illumination lamp of the present invention is:
A white light-scattering thin film with fine irregularities was also formed on the outer surface of the multilayer optical interference film that reflects light in a specific wavelength range formed on the outer surface of the envelope by vapor deposition. Can be provided with a light scattering property by a simple method.
第１図は本発明実施例の正面図、第２図は第１図のＡ部
の拡大図、第３図（Ａ）、（Ｂ）は多層光干渉膜の分光
反射特性説明図、第４図（Ａ）、（Ｂ）は配光分布特性
の説明図である。 １……封体、４……フィラメント 41……発光部、42……非発光部 ７……多層光干渉膜、８……散光性薄膜FIG. 1 is a front view of an embodiment of the present invention, FIG. 2 is an enlarged view of a portion A in FIG. 1, FIGS. 3 (A) and 3 (B) are diagrams illustrating spectral reflection characteristics of a multilayer optical interference film, and FIG. FIGS. 7A and 7B are explanatory diagrams of light distribution characteristics. DESCRIPTION OF SYMBOLS 1 ... Envelope, 4 ... Filament 41 ... Light-emitting part, 42 ... Non-light-emitting part 7 ... Multilayer light interference film, 8 ... Light-diffusing thin film
Claims (1)
波長域の光を反射する多層光干渉膜が蒸着法により形成
され、この多層光干渉膜の外表面に、MgF2、ZnS、SiO2
などからなる微小な凹凸を有する白色系統の散光性薄膜
が同じく蒸着法により形成されたことを特徴とする原稿
照明用ランプ。1. A multilayer optical interference film that reflects light in a specific wavelength range is first formed on the outer surface of a quartz glass envelope by a vapor deposition method, and MgF 2 , ZnS , SiO 2
An original illumination lamp characterized in that a white light-scattering thin film having fine irregularities made of a material such as that described above is also formed by a vapor deposition method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1243473A JP2730002B2 (en) | 1989-09-21 | 1989-09-21 | Original illumination lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1243473A JP2730002B2 (en) | 1989-09-21 | 1989-09-21 | Original illumination lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03107878A JPH03107878A (en) | 1991-05-08 |
| JP2730002B2 true JP2730002B2 (en) | 1998-03-25 |
Family
ID=17104415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1243473A Expired - Fee Related JP2730002B2 (en) | 1989-09-21 | 1989-09-21 | Original illumination lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2730002B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60101373U (en) * | 1983-12-16 | 1985-07-10 | 東芝ライテック株式会社 | halogen light bulb |
-
1989
- 1989-09-21 JP JP1243473A patent/JP2730002B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03107878A (en) | 1991-05-08 |
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