JPH0716942A - Mold for optical element - Google Patents
Mold for optical elementInfo
- Publication number
- JPH0716942A JPH0716942A JP19083993A JP19083993A JPH0716942A JP H0716942 A JPH0716942 A JP H0716942A JP 19083993 A JP19083993 A JP 19083993A JP 19083993 A JP19083993 A JP 19083993A JP H0716942 A JPH0716942 A JP H0716942A
- Authority
- JP
- Japan
- Prior art keywords
- molding
- optical element
- mold
- optical
- porous material
- 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.)
- Withdrawn
Links
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はレンズやプリズムあるい
はフィルタ等の光学素子を押圧成形する光学素子成形用
型に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical element molding die for pressing an optical element such as a lens, a prism or a filter.
【０００２】[0002]
【従来の技術】近年、レンズ・プリズム・フィルタなど
の光学素子は光学ガラス素材を加熱軟化して対向する一
対の光学素子成形用型で押圧することによって成形して
いる。しかしながら、この方法は押圧成形した光学素子
を型から離型する工程において、離型のための離型力を
要した。この離型力を抑制する従来方法として、特開昭
６２−２４０５３５号公報が開示されている。この方法
は、光学素子成形用型を多孔質材料により形成し、多孔
質の内部微細孔を通じ型と光学素子の界面に気体を供給
して光学素子を成形用型から離型するものである。2. Description of the Related Art In recent years, optical elements such as lenses, prisms and filters have been molded by heating and softening an optical glass material and pressing it with a pair of optical element molding dies opposed to each other. However, this method requires a releasing force for releasing in the step of releasing the press-molded optical element from the mold. As a conventional method for suppressing this releasing force, Japanese Patent Application Laid-Open No. 62-240535 is disclosed. In this method, an optical element molding die is formed of a porous material, and gas is supplied to the interface between the die and the optical element through porous internal fine pores to release the optical element from the molding die.
【０００３】[0003]
【発明が解決しようとする課題】しかし、上述した方法
では、成形用型の成形面も多孔質材料となっており、光
学ガラス素子を成形する際に、成形面の微細部まで転写
されるところから光学素子の面精度が低下するばかりで
なく、面粗度も大きくなり、光学素子としての外観品質
が劣化するという問題があった。However, in the above-mentioned method, the molding surface of the molding die is also made of a porous material, and when the optical glass element is molded, a fine portion of the molding surface is transferred. Therefore, there is a problem that not only the surface accuracy of the optical element is lowered, but also the surface roughness is increased and the appearance quality as the optical element is deteriorated.
【０００４】本発明は上記従来の問題点に鑑みてなされ
たもので、押圧成形後に容易に光学素子成形用型から光
学素子を離型することができ、しかも外観品質も良好な
光学素子を成形できる光学素子成形用型を提供すること
を目的とする。The present invention has been made in view of the above-mentioned conventional problems, and an optical element can be easily released from an optical element molding die after press molding, and an optical element having good appearance quality can be molded. An object of the present invention is to provide a mold for optical element molding that can be performed.
【０００５】[0005]
【課題を解決するための手段】上記問題点を解決するた
め本発明は、光学素子を成形する成形面における光学機
能面以外の一部または全部の表面が多孔質材料で形成さ
れていることを特徴とする。In order to solve the above problems, the present invention provides that a part or all of the molding surface for molding an optical element other than the optically functional surface is formed of a porous material. Characterize.
【０００６】[0006]
【作用】上記構成では、成形面における光学機能面以外
の部分には多孔質材料からなる表面を有しているので、
押圧成形した後、型から光学素子を離型する際に、多孔
質材料の内部に存在する多数の空孔を通じて、光学素子
の表面と光学素子成形用型の成形面の間に気体が供給さ
れ、これにより気体による薄い空隙を生じる。そして、
この空隙は楔状に成形面内に広がりながら離型が進行す
る。In the above structure, the surface other than the optical function surface of the molding surface has a surface made of a porous material.
After the press molding, when releasing the optical element from the mold, gas is supplied between the surface of the optical element and the molding surface of the optical element molding mold through a large number of holes existing inside the porous material. , This creates a thin void due to the gas. And
The release progresses while the voids spread like wedges in the molding surface.
【０００７】従って成形面内に多孔質材料からなる面が
存在しない光学素子成形用型に比べて、光学素子を離型
する時に必要な外部からの力、いわゆる離型力が小さく
なる。このため大きな離型力を生じた時に発生する光学
素子の割れ等の不良発生がなくなる。一方、成形面の光
学機能面は多孔質材料ではないところから、充分な鏡面
性が付与でき、これにより、高い面精度で面粗度が小さ
く外観品質が良好な光学素子を成形できる。Therefore, as compared with an optical element molding die in which there is no surface made of a porous material in the molding surface, the external force required for releasing the optical element, that is, the so-called releasing force, becomes smaller. Therefore, the occurrence of defects such as cracking of the optical element that occurs when a large releasing force is generated is eliminated. On the other hand, since the optical functional surface of the molding surface is not a porous material, sufficient specularity can be imparted, whereby an optical element with high surface accuracy, low surface roughness and good appearance quality can be molded.
【０００８】[0008]
【実施例１】図１ないし図３は本発明の実施例１を示
し、型基材１をＷＣ−Ｎｉ−Ｃｒ合金により形成し、成
形面となる面を成形面径２まで所望形状に加工する。次
ぎに光学機能面径３よりも外周側に段差を形成し、成形
用の所望形状に相似した形状に加工する。ここで本実施
例では成形面径２をφ２０ｍｍ、光学機能面径３をφ１
８ｍｍ、段差部６の径をφ１８．５ｍｍとしている。ま
た所望形状を曲率Ｒ＝３２．５ｍｍのＵ面、段差部の高
さ０．１５ｍｍ、段差部６の曲率Ｒ＝３２．６５ｍｍの
Ｕ面としている。成形加工面５，６はいずれも鏡面と
し、Ｒｍａｘ＝０．０３ｍｍ以下にした。次ぎにこの成
形加工面５，６に対し、図２に示すようにＣｒ2 Ｏ3 を
爆発溶射法により、膜厚０．２０ｍｍの厚さで気孔率１
０％になる条件で被覆した。この時、型基材との中間層
としてＮｉ−Ｃｒあるいは、Ｎｉ−Ａｌの溶射被膜を１
００μｍの厚さで被覆した。その後、溶射被膜７ごと成
形加工面を研削し、成形加工面５を露出させた。その
後、研磨加工を施し、成形加工面５の面粗度をＲｍａｘ
＝０．０２８μｍとし、所望形状にした。この時、成形
加工面６に被覆された溶射被膜は成形面に残っており、
その面粗度はＲｍａｘ＝０．１８μｍであった。その加
工面の溶射被膜７が残っている面部分をマスクし、それ
以外の面に対して図３に示すように、Ｃｒ−Ｎ膜８をＰ
ＶＤ法により膜厚０．５μｍ以下で被膜した。Embodiment 1 FIGS. 1 to 3 show Embodiment 1 of the present invention, in which a mold base 1 is formed of a WC-Ni-Cr alloy, and a surface to be a molding surface is processed into a desired shape up to a molding surface diameter 2. To do. Next, a step is formed on the outer peripheral side with respect to the optical function surface diameter 3 and processed into a shape similar to a desired shape for molding. Here, in this embodiment, the molding surface diameter 2 is φ20 mm and the optical function surface diameter 3 is φ1.
The diameter of the stepped portion 6 is 8 mm and the diameter of the stepped portion 6 is 18.5 mm. The desired shape is a U surface with a curvature R = 32.5 mm, a height of the stepped portion is 0.15 mm, and a curvature R of the stepped portion 6 is 32.65 mm. All the molding surfaces 5 and 6 were mirror surfaces, and Rmax was 0.03 mm or less. Next, as shown in FIG. 2, Cr 2 O 3 was explosively sprayed onto the formed surfaces 5 and 6 by an explosive spraying method to obtain a porosity of 1 at a thickness of 0.20 mm.
The coating was performed under the condition of 0%. At this time, a thermal spray coating of Ni-Cr or Ni-Al is used as an intermediate layer with the mold base material.
Coated to a thickness of 00 μm. After that, the molding surface was ground together with the sprayed coating 7 to expose the molding surface 5. After that, polishing processing is performed, and the surface roughness of the molding processing surface 5 is Rmax.
= 0.028 μm to obtain a desired shape. At this time, the thermal spray coating coated on the molding surface 6 remains on the molding surface,
The surface roughness was Rmax = 0.18 μm. The surface portion of the processed surface where the thermal spray coating 7 remains is masked, and the Cr-N film 8 is formed on the other surface as shown in FIG.
A film having a thickness of 0.5 μm or less was formed by the VD method.
【０００９】この様にして成形した光学素子成形用型を
用い、商品名ＳＫ１１（オハラ（株）製）のガラス素材
を押圧成形した。そして、成形後に、離型する際の離型
力を測定した。離型力は、型を光学素子から引き離すた
めに必要な加重で測定した。従来の成形面に多孔質材料
を設けていない場合の離型力は１５〜３０ｋｇｆであっ
たのに対し、本実施例の離型力はほとんど発生しなかっ
た。また成形した光学素子の外観品質も良好であり、光
学機能面の面精度がＲｍａｘ＝０．０２７μｍであり、
光学性能を充分満足するものであった。従って、本実施
例の光学素子成形用型は、離型力を抑制し、光学性能を
充分満足する外観を確保することができる。A glass material having a trade name of SK11 (manufactured by OHARA CORPORATION) was press-molded using the optical element molding die molded in this manner. Then, after molding, the releasing force at the time of releasing was measured. The mold release force was measured by the weight required to separate the mold from the optical element. The mold releasing force in the case where the porous material was not provided on the conventional molding surface was 15 to 30 kgf, whereas the mold releasing force of this example was hardly generated. Further, the appearance quality of the molded optical element is good, and the surface accuracy of the optical function surface is Rmax = 0.027 μm.
The optical performance was sufficiently satisfied. Therefore, the optical element molding die of the present embodiment can suppress the releasing force and ensure the appearance that sufficiently satisfies the optical performance.
【００１０】[0010]
【実施例２】図４は本発明の実施例２を示し、ＡｌＮ焼
結体により型基材１を成形し、この型基材１の外周部分
に多孔質炭素をリング状に成形した外周型１０を設け
た。この型の成形面に対し外周型１０と組み合わせた状
態で鏡面研磨加工を施した。この加工により光学機能面
を含んだＡｌＮ焼結体からなる成形面１１は面粗度がＲ
ｍａｘ＝０．０３２μｍであった。これに対し、外周に
設けた多孔質炭素から成る成形面１２は面粗度がＲｍａ
ｘ＝０．１５μｍであった。なお、外周型１０は外れな
いように型押さえ５により型基材１に押さえている。[Embodiment 2] FIG. 4 shows Embodiment 2 of the present invention, in which a mold base material 1 is molded from an AlN sintered body, and a porous carbon is molded into a ring shape on the outer peripheral portion of the mold base material 1. 10 is provided. The molding surface of this mold was mirror-polished while being combined with the outer peripheral mold 10. By this processing, the molding surface 11 made of the AlN sintered body including the optical function surface has a surface roughness R.
max = 0.032 μm. On the other hand, the molding surface 12 provided on the outer periphery and made of porous carbon has a surface roughness of Rma.
x was 0.15 μm. The outer peripheral die 10 is pressed against the die base material 1 by the die retainer 5 so as not to come off.
【００１１】本実施例では、型基材１の成形面１１の径
がφ２２ｍｍ、外周型１０の成形面１２の最大外径がφ
２４．５ｍｍであり、成形面の曲率がＲ＝２８．５ｍｍ
のＵ面となっている。この様にして成形した光学素子成
形様型を用い、ＢＫ７のガラス素材を押圧成形した。実
施例１と同様に、離型力を測定したところ、離型力は発
生せず、光学素子の外観品質も良好で、光学機能面の面
粗度がＲｍａｘ＝０．０３３μｍであり、光学性能を十
分満足するものであった。In this embodiment, the molding surface 11 of the mold base 1 has a diameter of 22 mm, and the molding surface 12 of the outer peripheral mold 10 has a maximum outer diameter of φ.
24.5 mm, the curvature of the molding surface is R = 28.5 mm
It is the U side of. The glass material of BK7 was press-molded using the optical element molding pattern thus molded. When the releasing force was measured in the same manner as in Example 1, the releasing force was not generated, the appearance quality of the optical element was good, and the surface roughness of the optical functional surface was Rmax = 0.033 μm. Was satisfied enough.
【００１２】[0012]
【発明の効果】以上の様に、本発明の光学素子成形用型
は、光学性能を十分満足する外観品質を有した光学素子
を押圧成形できると共に、この押圧成形後における離型
の際の離型力を抑制でき、離型力が小さいところから連
続成形等における離型時のトラブルの発生がなくなり、
効率良く大量生産を行うことができる。INDUSTRIAL APPLICABILITY As described above, the optical element molding die of the present invention can press-mold an optical element having an appearance quality sufficiently satisfying the optical performance, and release it at the time of releasing after the press-molding. The mold force can be suppressed, and since the mold release force is small, troubles during mold release such as continuous molding can be eliminated.
Mass production can be performed efficiently.
【図１】本発明の実施例１における型基材を示す断面
図。FIG. 1 is a cross-sectional view showing a mold substrate in Example 1 of the present invention.
【図２】多孔質材料を被覆した断面図。FIG. 2 is a cross-sectional view covering a porous material.
【図３】本発明の実施例１の断面図。FIG. 3 is a sectional view of the first embodiment of the present invention.
【図４】本発明の実施例２の断面図。FIG. 4 is a sectional view of a second embodiment of the present invention.
１ 型基材 ２ 成形面径 ３ 光学機能面径 ７ 多孔質材料 1 type base material 2 molding surface diameter 3 optical functional surface diameter 7 porous material
Claims (1)
機能面以外の一部または全部の表面が多孔質材料で形成
されていることを特徴とする光学素子成形用型。1. A mold for molding an optical element, characterized in that a part or all of the surface of the molding surface for molding the optical element other than the optically functional surface is formed of a porous material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19083993A JPH0716942A (en) | 1993-07-02 | 1993-07-02 | Mold for optical element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19083993A JPH0716942A (en) | 1993-07-02 | 1993-07-02 | Mold for optical element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0716942A true JPH0716942A (en) | 1995-01-20 |
Family
ID=16264630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19083993A Withdrawn JPH0716942A (en) | 1993-07-02 | 1993-07-02 | Mold for optical element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0716942A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000218628A (en) * | 1999-01-28 | 2000-08-08 | Asahi Optical Co Ltd | Mold for molding optical element |
| JP2011161727A (en) * | 2010-02-08 | 2011-08-25 | Fujifilm Corp | Molding die of optical molded product, method of molding optical molded product, and lens array |
-
1993
- 1993-07-02 JP JP19083993A patent/JPH0716942A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000218628A (en) * | 1999-01-28 | 2000-08-08 | Asahi Optical Co Ltd | Mold for molding optical element |
| JP2011161727A (en) * | 2010-02-08 | 2011-08-25 | Fujifilm Corp | Molding die of optical molded product, method of molding optical molded product, and lens array |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20000905 |