JPH0433001B2 - - Google Patents
Info
- Publication number
- JPH0433001B2 JPH0433001B2 JP58086871A JP8687183A JPH0433001B2 JP H0433001 B2 JPH0433001 B2 JP H0433001B2 JP 58086871 A JP58086871 A JP 58086871A JP 8687183 A JP8687183 A JP 8687183A JP H0433001 B2 JPH0433001 B2 JP H0433001B2
- Authority
- JP
- Japan
- Prior art keywords
- wavelength
- filter
- oxide film
- photographic
- film
- 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
- 239000011521 glass Substances 0.000 claims description 17
- 238000010521 absorption reaction Methods 0.000 claims description 9
- 229910021193 La 2 O 3 Inorganic materials 0.000 claims description 5
- 238000002834 transmittance Methods 0.000 claims description 5
- 239000000758 substrate Substances 0.000 claims description 4
- 230000003595 spectral effect Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000000151 deposition Methods 0.000 description 5
- 229910044991 metal oxide Inorganic materials 0.000 description 4
- 150000004706 metal oxides Chemical class 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000005388 borosilicate glass Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
- 239000005361 soda-lime glass Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
- 238000007738 vacuum evaporation Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/28—Interference filters
- G02B5/285—Interference filters comprising deposited thin solid films
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は、ガラス基板面にZrO2，CeO2，
La2O3のいずれか一種の酸化被膜を被着してなる
写真用フイルターに関する。[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides ZrO 2 , CeO 2 ,
This invention relates to a photographic filter coated with an oxide film of any one of La 2 O 3 .
従来、天然色写真撮影において写真用フイルム
の色再現性をよくするために色ガラスフイルター
が使用されているが、これは紫外線を遮断し可視
光をよく透過しかつ520〜560nmの波長域付近に
数パーセントの光吸収ピークを有する特性のもの
が望ましいことが知られている。この写真用色ガ
ラスフイルターは、所定のガラス原料を調合して
電気炉やガス燃焼炉などにより1300〜1500℃の高
温度で十分に溶融し、よく撹拌した後1000〜1200
℃の温度で所望の金型に直接収容してプレス成形
する。ついでこの成形品を500〜600℃程度の温度
で数時間に亘り熱処理し発色させて色ガラスフイ
ルターが完成する。
Conventionally, colored glass filters have been used to improve the color reproducibility of photographic film in natural color photography, but these filters block ultraviolet rays, transmit visible light well, and filter around the wavelength range of 520 to 560 nm. It is known that it is desirable to have a characteristic of having a light absorption peak of several percent. This photographic color glass filter is produced by mixing specified glass raw materials, melting them thoroughly at a high temperature of 1300 to 1500℃ in an electric furnace or gas combustion furnace, stirring well, and then heating them to a temperature of 1000 to 1200℃.
It is directly placed in a desired mold and press-molded at a temperature of °C. This molded product is then heat-treated at a temperature of approximately 500 to 600°C for several hours to develop color, thereby completing a colored glass filter.
上記の色ガラスフイルターの製造においては、
ガラスの発色剤として高価な金やセレンを使用し
その組成含有量は0.001〜0.05重量％という微量
調合コントロールを行わねばならず、かつ高温溶
融、再加熱処理により発色など製造工程が複雑で
製造コストも高いという欠点がある。 In manufacturing the above colored glass filter,
Expensive gold and selenium are used as coloring agents for glass, and the composition content must be controlled in minute amounts of 0.001 to 0.05% by weight, and the manufacturing process is complicated, such as high-temperature melting and reheating treatment to develop color, resulting in high production costs. It also has the disadvantage of being expensive.
本発明は上記の欠点を除去するためになされた
もので、ガラス基板面に所定の金属酸化物の被膜
を形成することにより、紫外線を遮断し可視光を
よく透過しかつ520〜560nmの波長域に５〜20％
の吸収ピークを有する写真用フイルターを提供す
ることを目的とするものである。
The present invention was made to eliminate the above-mentioned drawbacks, and by forming a film of a specified metal oxide on the surface of a glass substrate, it blocks ultraviolet rays, transmits visible light well, and has a wavelength range of 520 to 560 nm. 5-20%
The object of the present invention is to provide a photographic filter having an absorption peak of .
本発明は、色ガラスフイルターのように複雑な
製造工程を必要とせず、透明ガラス基板たとえば
屈折率1.49〜1.52なるソーダライムガラスもしく
は硼珪酸ガラスの無色の透明ガラス基板の上面
に、所定の金属酸化被膜を形成し反射防止処理す
るという簡単な方法により得られる写真用フイル
ターであり、しかも前記色ガラスフイルターと同
等の分光特性を有するものである。すなわち、
ZrO2，CeO2，La2O3のいずれか一種であつて屈
折率が1.8〜2.2の範囲にある酸化被膜を光学的膜
厚3/4波長（波長：500〜600nm）で透明ガラス基
板面に被着してなり、520〜560nmの波長域に５
〜20％の吸収ピークを有しかつその透過率が80％
以上であることを特徴とする写真用フイルターで
ある。
The present invention does not require a complicated manufacturing process unlike colored glass filters, and instead uses a predetermined metal oxide film on the upper surface of a colorless transparent glass substrate such as soda lime glass or borosilicate glass with a refractive index of 1.49 to 1.52. This is a photographic filter that can be obtained by a simple method of forming a coating and applying anti-reflection treatment, and has spectral characteristics equivalent to those of the colored glass filters described above. That is,
An oxide film that is one of ZrO 2 , CeO 2 , or La 2 O 3 and has a refractive index in the range of 1.8 to 2.2 is coated on the surface of a transparent glass substrate with an optical thickness of 3/4 wavelength (wavelength: 500 to 600 nm). 5 in the wavelength range of 520 to 560 nm.
It has an absorption peak of ~20% and its transmittance is 80%
This is a photographic filter characterized by the above.
この写真用フイルターは、反射防止処理により
波長400〜800nmにおける平均透過率が85％以上
で、透過限界波長は330〜350nmにあり、370nm
で透過率が75±５％となり、520〜560nmの波長
域に５〜20％の吸収ピークをもちかつその透過率
が80％以上なる分光特性を有しているので、写真
撮影に使用した場合、不要な紫外線を適確に遮断
してフレヤーやゴーストの少ない美しい色彩写真
効果が得られるものである。また本発明のフイル
ターは520〜560nm波長域の吸収ピークによりピ
ンク色を呈しているため、特に人物写真における
肌色の再現性が良好で、全体的なコントラストも
鮮明である。さらに太陽光以外の照明またはスト
ロボ撮影等においても光源の波長やエネルギーに
影響されることなく同様にすぐれた効果を示す。 This photographic filter has an average transmittance of 85% or more in the wavelength range of 400 to 800 nm due to anti-reflection treatment, and the transmission limit wavelength is in the range of 330 to 350 nm and 370 nm.
When used for photography, it has a transmittance of 75 ± 5%, an absorption peak of 5 to 20% in the wavelength range of 520 to 560 nm, and a transmittance of 80% or more. By accurately blocking unnecessary ultraviolet rays, beautiful color photographic effects with less flare and ghosts can be obtained. Further, since the filter of the present invention exhibits a pink color due to an absorption peak in the wavelength range of 520 to 560 nm, the reproducibility of skin tones is particularly good in portrait photographs, and the overall contrast is clear. Furthermore, it exhibits similar excellent effects in lighting other than sunlight or in strobe photography, etc., without being affected by the wavelength or energy of the light source.
本発明において金属酸化被膜の屈折率および膜
厚を上記数値に限定した理由を説明する。ガラス
面に被着された金属酸化被膜の膜厚が3/4波長で
あつても屈折率が2.2を超えると吸収が過大とな
り、屈折率が1.8より小さいと所望の吸収が得ら
れない。膜厚が3/4波長より厚くなると不均質膜
となることが多く、3/4波長より薄いと吸収が少
なくなるので、いずれの場合も適当でない。ま
た、上記の限定した数値以外では520〜560nmと
は別の波長域に吸収ピークを生ずることがある。 The reason why the refractive index and film thickness of the metal oxide film are limited to the above values in the present invention will be explained. Even if the thickness of the metal oxide film deposited on the glass surface is 3/4 wavelength, if the refractive index exceeds 2.2, absorption will be excessive, and if the refractive index is smaller than 1.8, the desired absorption will not be obtained. If the film thickness is thicker than 3/4 wavelength, it will often become an inhomogeneous film, and if it is thinner than 3/4 wavelength, absorption will be reduced, so either case is not suitable. Moreover, absorption peaks may occur in a wavelength range other than 520 to 560 nm at values other than the above-mentioned limited values.
次に本発明の実施例について説明する。 Next, examples of the present invention will be described.
温度300℃、真空度１×10-4Torr（O2ガス導入）
の真空蒸着条件において、ソーダライムガラスよ
りなる屈折率1.51の透明ガラス基板の一面にZrO2
を3/4波長（波長：540nm）の膜厚で電子線蒸着
して酸化被膜を形成し、さらにその上面に三層反
射防止膜を蒸着すると本発明の写真用フイルター
が得られる。前記被膜蒸着における膜厚の制御に
は光電式膜厚計が使用される。蒸着された酸化被
膜は経時変化がなく、被着強度も良好である。こ
の写真用フイルターの分光特性を図の曲線１で示
すが、従来の色ガラスフイルターの分光特性曲線
２とほぼ近似している。また前記写真用フイルタ
ーの他の一面にも三層反射防止膜を蒸着したフイ
ルターの分光特性を曲線３に示す。 Temperature: 300℃, vacuum level: 1×10 -4 Torr (O 2 gas introduced)
Under vacuum evaporation conditions of
The photographic filter of the present invention is obtained by depositing the oxide film with an electron beam to a thickness of 3/4 wavelength (wavelength: 540 nm) to form an oxide film, and then depositing a three-layer antireflection film on the top surface of the oxide film. A photoelectric film thickness meter is used to control the film thickness during the film deposition. The deposited oxide film does not change over time and has good adhesion strength. The spectral characteristics of this photographic filter are shown by curve 1 in the figure, which is almost similar to spectral characteristics curve 2 of a conventional colored glass filter. Curve 3 shows the spectral characteristics of a filter in which a three-layer antireflection film was deposited on the other side of the photographic filter.
上記ZrO2の代わりにCeO2またはLa2O3を3/4波
長（波長：540nm）の膜厚で蒸着して酸化被膜を
形成したフイルターの場合も、ほぼ同様の分光特
性が得られる。 In the case of a filter in which an oxide film is formed by depositing CeO 2 or La 2 O 3 in place of ZrO 2 to a thickness of 3/4 wavelength (wavelength: 540 nm), almost the same spectral characteristics can be obtained.
本発明の写真用フイルターを実際の写真撮影に
使用した場合、人物の肌色の再現性がよく、青
色がすつきりとしていて、画面全体のコントラ
ストが鮮明であり、太陽光以外の光源において
も肌色の再現性が良好である等のすぐれた効果が
得られる。
When the photographic filter of the present invention is used in actual photography, the reproducibility of human skin tones is good, the blue color is clear, the contrast of the entire screen is clear, and the skin tones are good even under light sources other than sunlight. Excellent effects such as good reproducibility can be obtained.
上記の実施例ではガラス面への酸化被膜の形成
は真空蒸着によつて行つたが、この方法に限定さ
れることなくスパツタリング法、浸漬法などを採
用しても同様の効果が得られる。 In the above embodiments, the oxide film was formed on the glass surface by vacuum deposition, but the method is not limited to this, and similar effects can be obtained by using sputtering, dipping, or the like.
以上のように、本発明の写真用フイルターは普
通の透明ガラス基板の上面にZrO2，CeO2，
La2O3のいずれか一種の酸化被膜を膜厚3/4波長
で被着するという簡単な方法が得られ、しかも従
来の色ガラスフイルターと同等の分光特性を有す
るので、製造工程の簡易化、製造コストの低減に
すぐれた効果をあげることができるものである。 As described above, the photographic filter of the present invention has ZrO 2 , CeO 2 ,
A simple method of depositing an oxide film of any type of La 2 O 3 with a thickness of 3/4 wavelength can be obtained, and it has the same spectral characteristics as conventional colored glass filters, simplifying the manufacturing process. , it is possible to achieve an excellent effect in reducing manufacturing costs.
図面は本発明の実施例の分光特性を示す曲線図
である。
１および３は本発明の写真用フイルターの特性
曲線、２は従来の色ガラスフイルターの特性曲
線。
The drawing is a curve diagram showing the spectral characteristics of an example of the present invention. 1 and 3 are characteristic curves of the photographic filter of the present invention, and 2 is a characteristic curve of a conventional colored glass filter.
Claims (1)
て屈折率が1.8〜2.2の範囲にある酸化被膜を膜厚
３／４波長（波長：500〜600nm）でガラス基板面に
被着してなり、520〜560nmの波長域に５〜20％
の吸収ピークを有しかつその透過率が80％以上で
あることを特徴とする写真用フイルター。1 An oxide film made of one of ZrO 2 , CeO 2 , or La 2 O 3 with a refractive index in the range of 1.8 to 2.2 is coated on the glass substrate surface with a film thickness of 3/4 wavelength (wavelength: 500 to 600 nm). 5 to 20% in the wavelength range of 520 to 560 nm.
1. A photographic filter having an absorption peak of 80% or more and a transmittance of 80% or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58086871A JPS59212806A (en) | 1983-05-18 | 1983-05-18 | Filter for photography |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58086871A JPS59212806A (en) | 1983-05-18 | 1983-05-18 | Filter for photography |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59212806A JPS59212806A (en) | 1984-12-01 |
| JPH0433001B2 true JPH0433001B2 (en) | 1992-06-01 |
Family
ID=13898882
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58086871A Granted JPS59212806A (en) | 1983-05-18 | 1983-05-18 | Filter for photography |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59212806A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH049901U (en) * | 1990-05-15 | 1992-01-28 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49107428A (en) * | 1973-02-14 | 1974-10-12 |
-
1983
- 1983-05-18 JP JP58086871A patent/JPS59212806A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49107428A (en) * | 1973-02-14 | 1974-10-12 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59212806A (en) | 1984-12-01 |
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