JPH09265002A - Optical element - Google Patents
Optical elementInfo
- Publication number
- JPH09265002A JPH09265002A JP8072750A JP7275096A JPH09265002A JP H09265002 A JPH09265002 A JP H09265002A JP 8072750 A JP8072750 A JP 8072750A JP 7275096 A JP7275096 A JP 7275096A JP H09265002 A JPH09265002 A JP H09265002A
- Authority
- JP
- Japan
- Prior art keywords
- refractive index
- resin layer
- base material
- optical element
- glass base
- 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
Landscapes
- Surface Treatment Of Optical Elements (AREA)
- Laminated Bodies (AREA)
- Silicon Compounds (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、硝子母材上に紫外線硬
化型樹脂よりなる樹脂層を有する光学素子に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical element having a resin layer made of an ultraviolet curable resin on a glass base material.
【０００２】[0002]
【従来技術】近年、カメラレンズなどの光学機器におい
て、非球面レンズを使用することにより、光学機器のレ
ンズ枚数の削減、小型軽量化、低コスト化が図られてい
る。非球面レンズとして、硝子母材上に紫外線硬化型樹
脂よりなる樹脂層を有する複合型光学素子が知られてい
る。2. Description of the Related Art In recent years, by using aspherical lenses in optical devices such as camera lenses, the number of lenses in the optical devices has been reduced, the size and weight have been reduced, and the cost has been reduced. As an aspherical lens, a composite optical element having a resin layer made of an ultraviolet curable resin on a glass base material is known.
【０００３】複合型光学素子は、レプリカ法により所望
の形状の光学面を容易に成形することができ、量産性に
優れた光学素子である。特に、光学設計上の自由度を高
めるために、幅広い硝子が母材として用いられる様にな
ってきた。The composite optical element is an optical element which can easily form an optical surface having a desired shape by the replica method and is excellent in mass productivity. In particular, a wide range of glass has come to be used as a base material in order to increase the degree of freedom in optical design.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、硝子母
材の屈折率の範囲は１．４〜１．９５までと選択支が広
いのに対して、紫外線硬化型樹脂の屈折率の範囲は１．
４５〜１．５５程度と選択支が狭いので、高屈折率の硝
子を母材として使用する場合には、硝子母材と紫外線硬
化型樹脂との適切な組み合わせがない。However, while the range of refractive index of the glass base material is as wide as 1.4 to 1.95, the range of refractive index of the ultraviolet curable resin is 1.
Since the selection range is as narrow as about 45 to 1.55, there is no suitable combination of the glass base material and the ultraviolet curable resin when using glass with a high refractive index as the base material.
【０００５】従って、硝子母材と紫外線硬化型樹脂の屈
折率が大きく異なることに起因する硝子母材と樹脂層の
界面での反射のため、紫外線硬化型樹脂層上に反射防止
膜を設けても光学素子として反射防止効果が充分に得ら
れないという問題点があった。例えば、屈折率１．８３
の硝子母材に屈折率１．５程度の紫外線硬化型樹脂を形
成した場合には、その界面での反射率が１％程度と無視
できない量になっている。Therefore, an antireflection film is provided on the ultraviolet curable resin layer due to reflection at the interface between the glass base material and the resin layer due to a large difference in the refractive index between the glass base material and the ultraviolet curable resin. However, there is a problem that an antireflection effect cannot be sufficiently obtained as an optical element. For example, a refractive index of 1.83
When an ultraviolet curable resin having a refractive index of about 1.5 is formed on the glass base material, the reflectance at the interface is about 1%, which is a non-negligible amount.
【０００６】本発明は、これらの問題点に鑑みてなされ
たものであり、複合型光学素子において、硝子母材と紫
外線硬化型樹脂層との間の界面で反射が起こらないよう
な光学素子を提供することを目的とする。The present invention has been made in view of these problems, and in the composite optical element, an optical element in which reflection does not occur at the interface between the glass base material and the ultraviolet curable resin layer is provided. The purpose is to provide.
【０００７】[0007]
【課題を解決するための手段】本発明は第１に「硝子母
材上に紫外線硬化型樹脂よりなる樹脂層を有する光学素
子において、前記硝子母材と前記樹脂層との間に、前記
硝子母材側から前記樹脂層へ、光学的膜厚λ／４のＡｌ
2Ｏ3からなる第１層と、光学的膜厚λ／２のＳｉＯ2か
らなる第２層を積層してなる光学素子（請求項１）」を
提供する。The first aspect of the present invention is to provide, in an optical element having a resin layer made of an ultraviolet curable resin on a glass base material, the glass material between the glass base material and the resin layer. Al with an optical film thickness of λ / 4 from the base material side to the resin layer
There is provided an optical element (claim 1) comprising a first layer made of 2 O 3 and a second layer made of SiO 2 having an optical film thickness of λ / 2.
【０００８】また、本発明は第２に「前記硝子母材の屈
折率が１．７５〜１．９５の範囲であることを特徴とす
る請求項１記載の光学素子（請求項２）」を提供する。In the second aspect of the present invention, the "optical element according to claim 1 (claim 2)" is characterized in that the refractive index of the glass base material is in the range of 1.75 to 1.95. provide.
【０００９】[0009]
【発明の実施形態】以下、実施例を示して具体的に本発
明を説明する。図１は本発明にかかる光学素子の第１の
実施例を示したものであり、屈折率１．８３の硝子母材
１と、屈折率１．５の紫外線硬化型樹脂層２との間に、
硝子母材１側から紫外線硬化型樹脂層２へ、屈折率１．
６５で光学的膜厚がλ／４（λは設計中心波長）のＡｌ
2Ｏ3層３、屈折率１．４７で光学的膜厚がλ／２のＳｉ
Ｏ 2層４を順次積層した構成をとっている。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below with reference to examples.
Explain the Ming. FIG. 1 shows a first optical element according to the present invention.
1 shows an example, and a glass base material having a refractive index of 1.83
1 and the ultraviolet curable resin layer 2 having a refractive index of 1.5,
From the glass base material 1 side to the ultraviolet curable resin layer 2, a refractive index of 1.
Al with an optical film thickness of 65 and λ / 4 (λ is the design center wavelength)
TwoOThreeLayer 3, Si having a refractive index of 1.47 and an optical film thickness of λ / 2
O TwoIt has a structure in which layers 4 are sequentially laminated.
【００１０】図２は、この構成における硝子母材１と紫
外線硬化型樹脂層２との間の界面での反射率を示してい
る。比較例１として、図２中に屈折率１．８３の硝子母
材と屈折率１．５の紫外線硬化型樹脂層のみからなる光
学素子の界面における反射率を示す。４００ｎｍ〜７０
０ｎｍの可視域全域にわたって、反射率が０．２％以下
に抑えられていることが判る。FIG. 2 shows the reflectance at the interface between the glass base material 1 and the ultraviolet curable resin layer 2 in this structure. As Comparative Example 1, FIG. 2 shows the reflectance at the interface between an optical element composed only of a glass base material having a refractive index of 1.83 and an ultraviolet curable resin layer having a refractive index of 1.5. 400 nm to 70
It can be seen that the reflectance is suppressed to 0.2% or less over the entire visible region of 0 nm.
【００１１】これにより、本発明にかかる第１実施例
が、非常に良好な反射防止効果を有することが判る。比
較例２、３として、図３に他は前記実施例と同様な条件
で、硝子母材と紫外線硬化型樹脂層との間に、光学的膜
厚がλ／４（λは設計中心波長）のＡｌ2Ｏ3層、屈折率
１．４７で光学的膜厚がλ／４のＳｉＯ2層を設けた場
合と、光学的膜厚がλ／４のＡｌ2Ｏ3層を設けた場合の
界面での反射率を示す。From this, it can be seen that the first embodiment according to the present invention has a very good antireflection effect. As Comparative Examples 2 and 3, the optical film thickness was λ / 4 (where λ is the design center wavelength) between the glass base material and the ultraviolet curable resin layer under the same conditions as in the above-mentioned Example except for FIG. of the Al 2 O 3 layer, and if the optical thickness is provided an SiO 2 layer of lambda / 4 in refractive index of 1.47, when the optical film thickness is provided the Al 2 O 3 layer of lambda / 4 The reflectance at the interface is shown.
【００１２】これにより、比較例２、３の構成でも反射
防止効果を有するが、本発明は４５０ｎｍ〜５５０ｎｍ
の波長域において、非常に反射率が小さく、非常に有効
な反射防止効果を有することが判る。図４は第２の実施
例として、実施例１と同様な条件で、屈折率１．９５の
硝子母材を用いた場合の硝子母材と紫外線硬化型樹脂層
との間の界面での反射率を示している。As a result, the structures of Comparative Examples 2 and 3 also have an antireflection effect, but the present invention is 450 nm to 550 nm.
It can be seen that the reflectance is very small in the wavelength range of 1 and the antireflection effect is very effective. FIG. 4 shows, as a second embodiment, reflection at the interface between the glass base material and the ultraviolet curable resin layer when a glass base material having a refractive index of 1.95 is used under the same conditions as in the first embodiment. Shows the rate.
【００１３】比較例４として、図４中に屈折率１．９５
の硝子母材と屈折率１．５の紫外線硬化型樹脂層のみか
らなる光学素子の界面における反射率を示す。これによ
り、硝子母材と紫外線硬化型樹脂層との屈折率差が０．
４５と大きくなっても、良好な反射防止効果を有するこ
とが判る。図５は第３の実施例として、実施例１と同様
な条件で、屈折率１．７５の硝子母材を用いた場合の硝
子母材と紫外線硬化型樹脂との間の界面での反射率を示
している。As Comparative Example 4, a refractive index of 1.95 is shown in FIG.
The reflectance at the interface between the optical element consisting of the glass base material and the ultraviolet curable resin layer having a refractive index of 1.5 is shown. As a result, the difference in refractive index between the glass base material and the UV-curable resin layer is 0.
It can be seen that even if it becomes as large as 45, it has a good antireflection effect. FIG. 5 shows, as a third embodiment, the reflectance at the interface between the glass base material and the UV curable resin when the glass base material having a refractive index of 1.75 is used under the same conditions as in the first embodiment. Is shown.
【００１４】比較例５として、図５中に屈折率１．７５
の硝子母材と屈折率１．５の紫外線硬化型樹脂層のみか
らなる光学素子の界面における反射率を示す。これよ
り、本発明にかかる第１実施例が、良好な反射防止効果
を有することが判る。但し、硝子母材の屈折率が１．７
５の場合は、硝子母材と紫外線硬化型樹脂層のみからな
る光学素子でも界面の反射率が約０．６％と比較的小さ
く、従って、これより屈折率の低い硝子母材について
は、硝子母材と紫外線硬化型樹脂層との間に反射防止膜
を形成してもその効果は、わずかである。As Comparative Example 5, a refractive index of 1.75 in FIG.
The reflectance at the interface between the optical element consisting of the glass base material and the ultraviolet curable resin layer having a refractive index of 1.5 is shown. From this, it is understood that the first embodiment according to the present invention has a good antireflection effect. However, the refractive index of the glass base material is 1.7.
In the case of 5, even the optical element consisting of the glass base material and the ultraviolet curable resin layer has a relatively small reflectance at the interface of about 0.6%. Therefore, for the glass base material having a lower refractive index than this, Even if an antireflection film is formed between the base material and the ultraviolet curable resin layer, its effect is slight.
【００１５】[0015]
【発明の効果】以上、説明した通り、本発明による光学
素子は硝子母材と紫外線硬化型樹脂層との間に、前記硝
子母材側から前記樹脂層へ、光学的膜厚λ／４のＡｌ2
Ｏ3からなる第１層と、光学的膜厚λ／２のＳｉＯ2から
なる第２層を設けることにより、硝子母材と紫外線硬化
型樹脂層との屈折率が大きく異なる場合に生じる有害な
反射を効果的に除去して、透過率の優れた光学素子をえ
ることができる。As described above, the optical element according to the present invention has an optical film thickness of λ / 4 between the glass base material and the ultraviolet curable resin layer, from the glass base material side to the resin layer. Al 2
By providing the first layer made of O 3 and the second layer made of SiO 2 having an optical film thickness of λ / 2, harmful effects caused when the refractive index of the glass base material and the ultraviolet curable resin layer are significantly different from each other It is possible to effectively remove reflection and obtain an optical element having excellent transmittance.
【図１】本発明にかかる光学素子の構成図である。FIG. 1 is a configuration diagram of an optical element according to the present invention.
【図２】本発明の第１の実施例の反射率特性図である。FIG. 2 is a reflectance characteristic diagram of the first embodiment of the present invention.
【図３】比較例２、３の反射率特性図である。FIG. 3 is a reflectance characteristic diagram of Comparative Examples 2 and 3.
【図４】本発明の第２の実施例の反射率特性図である。FIG. 4 is a reflectance characteristic diagram of the second embodiment of the present invention.
【図５】本発明の第３の実施例の反射率特性図である。FIG. 5 is a reflectance characteristic diagram of the third embodiment of the present invention.
１・・・硝子母材 ２・・・紫外線硬化型樹 ３・・・Ａｌ2Ｏ3層 ４・・・ＳｉＯ2層1 ... Glass base material 2 ... UV curable resin 3 ... Al 2 O 3 layer 4 ... SiO 2 layer
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｇ０２Ｂ 3/02 Ｇ０２Ｂ 3/02 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display location G02B 3/02 G02B 3/02
Claims (2)
脂層を有する光学素子において、前記硝子母材と前記樹
脂層との間に、前記硝子母材側から前記樹脂層へ、光学
的膜厚λ／４のＡｌ2Ｏ3からなる第１層と、光学的膜厚
λ／２のＳｉＯ2からなる第２層を積層してなる光学素
子。1. An optical element having a resin layer made of an ultraviolet curable resin on a glass base material, wherein an optical element is provided between the glass base material and the resin layer, from the glass base material side to the resin layer. An optical element in which a first layer made of Al 2 O 3 having a film thickness λ / 4 and a second layer made of SiO 2 having an optical film thickness λ / 2 are laminated.
５の範囲であることを特徴とする請求項１記載の光学素
子。2. The refractive index of the glass base material is 1.75 to 1.9.
The optical element according to claim 1, wherein the optical element has a range of 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8072750A JPH09265002A (en) | 1996-03-27 | 1996-03-27 | Optical element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8072750A JPH09265002A (en) | 1996-03-27 | 1996-03-27 | Optical element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09265002A true JPH09265002A (en) | 1997-10-07 |
Family
ID=13498351
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8072750A Pending JPH09265002A (en) | 1996-03-27 | 1996-03-27 | Optical element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09265002A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008083188A (en) * | 2006-09-26 | 2008-04-10 | Olympus Corp | Composite optical element and method of manufacturing the same |
| JP2015062234A (en) * | 2014-10-24 | 2015-04-02 | 株式会社島津製作所 | Method of manufacturing small solid laser element |
-
1996
- 1996-03-27 JP JP8072750A patent/JPH09265002A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008083188A (en) * | 2006-09-26 | 2008-04-10 | Olympus Corp | Composite optical element and method of manufacturing the same |
| JP2015062234A (en) * | 2014-10-24 | 2015-04-02 | 株式会社島津製作所 | Method of manufacturing small solid laser element |
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