JP2008094658A - Method for producing optical element and optical element - Google Patents

Method for producing optical element and optical element Download PDF

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JP2008094658A
JP2008094658A JP2006278229A JP2006278229A JP2008094658A JP 2008094658 A JP2008094658 A JP 2008094658A JP 2006278229 A JP2006278229 A JP 2006278229A JP 2006278229 A JP2006278229 A JP 2006278229A JP 2008094658 A JP2008094658 A JP 2008094658A
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optical element
surface roughness
mold
optical
press
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JP4777210B2 (en
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Nobuyuki Fujita
信幸 藤田
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Canon Inc
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Canon Inc
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Abstract

<P>PROBLEM TO BE SOLVED: To suppress stray light by diffused reflection or scattering at the non-optical effective portions of a lens and a prism. <P>SOLUTION: A glass material 4 is press-molded by using a press-molding die having a lower die 1, an upper die 2 and a barrel die 3 and then an optical element is produced. The inside surface 3a of the barrel die 3 is roughened to be a surface roughness Ra(1) to a circumferential direction of 0.08 μm and a surface roughness Ra(2) to an optical axis direction of 0.5 μm and its equivalent surface roughness is transferred to the optical element being a formed article. A black paint to prevent stray light is easily coated by roughening the outer peripheral surface of the optical element to a degree of not disturbing filling at press-molding. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、光学材料をモールド成形することにより、レンズやプリズム等の高精度な光学素子を得る光学素子の製造方法および光学素子に関するものである。   The present invention relates to a method for manufacturing an optical element and an optical element, which obtain a high-precision optical element such as a lens or a prism by molding an optical material.

近年において、光学素子のさらなる高性能化が進められてきている。そのため、乱反射や散乱による迷光（結像に関与する光束以外の光）においても、画像にゴーストやフレアを生じさせ、画質低下の原因の一つとなることから、その防止がより一層強く求められている。   In recent years, higher performance of optical elements has been promoted. For this reason, stray light (light other than the light flux involved in image formation) due to irregular reflection and scattering can cause ghosts and flares in the image and cause deterioration in image quality. Yes.

中でも、光学素子を組み合わせて構成される光学系においては、光学系の中に組み込まれる主要構成部品であるレンズやプリズムの周辺部等に、乱反射や散乱による迷光を生じ易い。   In particular, in an optical system configured by combining optical elements, stray light due to irregular reflection or scattering is likely to occur in the peripheral portions of lenses and prisms, which are main components incorporated in the optical system.

このような問題に対する対策として、従来は、例えば、レンズやプリズムの外周部を芯取り加工する際に、これら外周部に生じる荒ずり面に、迷光を吸収する黒色の塗料等を塗布する等の方法が採られてきた。   Conventionally, as a countermeasure against such problems, for example, when centering the outer periphery of a lens or prism, a black paint or the like that absorbs stray light is applied to a rough surface generated in the outer periphery. A method has been adopted.

例えば、特許文献１、特許文献２、特許文献３では、レンズやプリズムの周辺部に、墨やガラス用の黒色塗料といった、迷光を吸収して内面反射を防止するための塗料を塗布することにより、迷光を回避する提案がなされている。   For example, in Patent Document 1, Patent Document 2, and Patent Document 3, by applying a paint for absorbing stray light and preventing internal reflection, such as black paint for black or glass, on the periphery of a lens or prism. Proposals have been made to avoid stray light.

一方、近年において、上記のような芯取り加工を省略し、簡単かつ安価にレンズを製造するため、プレス機を用いたモールド成形により光学素子を成形する方法が開発されてきた。例えば、特許文献４のような型構造を用いてガラス素材をプレス成形する光学素子の成形方法が開発されてきた。   On the other hand, in recent years, a method of forming an optical element by molding using a press machine has been developed in order to omit the above-described centering process and to manufacture a lens easily and inexpensively. For example, a method for molding an optical element has been developed in which a glass material is press-molded using a mold structure such as that disclosed in Patent Document 4.

これによると、図５に示すように、上型１１１、下型１１２および円筒状の胴型１１３と接触するようにガラス素材１１４を充填させ、矢印Ｐ１、Ｐ２の方向に加圧するプレス成形により、上記型内で光学素子が成形される。   According to this, as shown in FIG. 5, the glass material 114 is filled so as to come into contact with the upper mold 111, the lower mold 112, and the cylindrical body mold 113, and press molding is performed in the directions indicated by the arrows P1 and P2. An optical element is molded in the mold.

さらには、特許文献５に開示されたように、型構造に設けた光軸方向と径方向で異なる表面粗さをレンズ外周に転写することによって、迷光を回避する提案がなされている。
特開平３−１２６０２号公報 特開平５−１８１００５号公報 特開平９−２５８００５号公報 特開平７−２４７１２８号公報 特開昭６４−６１３２８号公報 Furthermore, as disclosed in Patent Document 5, a proposal has been made to avoid stray light by transferring a surface roughness different in the optical axis direction and radial direction provided in the mold structure to the lens outer periphery.
JP-A-3-12602 JP-A-5-181005 JP-A-9-258005 JP 7-247128 A JP-A-64-61328

一般的に、上型、下型および胴型を用いて光学素子をプレス成形する場合は、側面部（外周部）が荒ずり面にならないため、黒色塗料を塗布する上で不都合が生じる。すなわち、光学素子の外周部に荒ずり面が形成されないため、黒色塗料を塗布した際に塗料がなじみにくく、多数回塗りを重ねても内面反射防止性能を得るように塗布することが困難となる。   Generally, when an optical element is press-molded using an upper mold, a lower mold, and a body mold, the side surface portion (outer peripheral portion) does not become a rough surface, which causes inconvenience in applying a black paint. That is, since a rough surface is not formed on the outer peripheral portion of the optical element, it is difficult to apply the paint when black paint is applied, and it is difficult to apply so as to obtain the inner surface antireflection performance even after repeated coating. .

また特許文献５においては、外周部の表面粗さについて、光軸方向より径方向を大きくすることで、迷光を回避する提案がなされている。しかしながら、光学材料を充填する際に径方向の表面粗さが大きいと、光学材料が型の転写面と接触して円周方向に押し流される際に型の転写面との摩擦が大きくなり、光学材料を均一に充填させることが困難となる。   In Patent Document 5, a proposal for avoiding stray light has been made by making the surface roughness of the outer peripheral portion larger in the radial direction than in the optical axis direction. However, if the surface roughness in the radial direction is large when filling the optical material, the friction with the transfer surface of the mold increases when the optical material comes into contact with the transfer surface of the mold and is washed away in the circumferential direction. It becomes difficult to uniformly fill the material.

本発明は、光学素子の外周部の迷光を効果的かつ簡便に抑制可能である光学素子の製造方法および光学素子を提供することを目的とするものである。   An object of the present invention is to provide an optical element manufacturing method and an optical element capable of effectively and simply suppressing stray light at the outer peripheral portion of the optical element.

本発明の光学素子の製造方法は、金型を用いたモールド成形によって光学素子を形成する工程を有し、前記光学素子の非光学有効部分に対応する前記金型の転写面において、前記転写面の円周方向に測定した表面粗さと、光軸方向または径方向に測定した表面粗さとの間に以下の２式で表わされる関係が成立することを特徴とする。
０．０１≦Ｒａ（１）／Ｒａ（２）＜０．９
０．０１μｍ≦Ｒａ（１）≦０．５μｍ
ここで、Ｒａ（１）：円周方向に測定した表面粗さＲａ
Ｒａ（２）：光軸方向または径方向に測定した表面粗さＲａ The optical element manufacturing method of the present invention includes a step of forming an optical element by molding using a mold, and the transfer surface of the mold corresponding to a non-optically effective portion of the optical element is the transfer surface. The relationship represented by the following two formulas is established between the surface roughness measured in the circumferential direction and the surface roughness measured in the optical axis direction or radial direction.
0.01 ≦ Ra (1) / Ra (2) <0.9
0.01 μm ≦ Ra (1) ≦ 0.5 μm
Here, Ra (1): surface roughness Ra measured in the circumferential direction
Ra (2): Surface roughness Ra measured in the optical axis direction or radial direction

光学素子の非光学有効部分に、迷光を抑制するための黒色塗料等を簡便に塗布することができ、かつ、金型内の光学材料の均一な充填を障げることのない表面粗さを転写する。   Surface roughness that can easily apply black paint for suppressing stray light to the non-optically effective portion of the optical element and does not hinder the uniform filling of the optical material in the mold. Transcript.

金型およびその成形品である光学素子の外周部において、Ｒａ（１）≧０．５μｍであると未充填が発生し、不良となり、Ｒａ（１）≦０．０１μｍであると黒色塗料等の塗布に不具合が起きる。また、Ｒａ（１）／Ｒａ（２）≦０．０１のとき、金型からの離型が悪化し、Ｒａ（１）／Ｒａ（２）≧０．９のときは、未充填が発生し、不良となる。   When Ra (1) ≧ 0.5 μm, unfilling occurs in the outer periphery of the mold and the optical element that is a molded product thereof, resulting in failure, and when Ra (1) ≦ 0.01 μm, black paint or the like Problems occur in application. Further, when Ra (1) / Ra (2) ≦ 0.01, the mold release from the mold deteriorates, and when Ra (1) / Ra (2) ≧ 0.9, unfilling occurs. , Become defective.

本発明を実施するための最良の形態を図面に基づいて説明する。   The best mode for carrying out the present invention will be described with reference to the drawings.

図１は、実施例１による光学素子の製造に用いるプレス成形型（金型）の構成を示すもので、成形用の下型１および上型２と、胴型３と、を有し、これらによって成形素材（光学材料）であるガラス素材４のプレス成形を行う。   FIG. 1 shows a configuration of a press mold (mold) used for manufacturing an optical element according to Example 1, which includes a lower mold 1 and an upper mold 2 for molding, and a body mold 3. The glass material 4 that is a molding material (optical material) is press-molded.

胴型３は、下型１と上型２の位置を規制し、支持するとともに、下型１および上型２を加熱するための図示しないヒーターを内部に備えている。   The body mold 3 regulates and supports the positions of the lower mold 1 and the upper mold 2 and includes a heater (not shown) for heating the lower mold 1 and the upper mold 2 inside.

胴型３の内側表面（転写面）３ａは、光軸方向の表面粗さＲａ（２）＝０．５μｍ、円周方向の表面粗さＲａ（１）＝０．０８μｍに加工されており、同等の表面粗さを成形品の側面部に転写するように構成されている。   The inner surface (transfer surface) 3a of the body mold 3 is processed to have a surface roughness Ra (2) = 0.5 μm in the optical axis direction and a surface roughness Ra (1) = 0.08 μm in the circumferential direction. It is configured to transfer the equivalent surface roughness to the side part of the molded product.

このプレス成形型を用いて、光学素子を製造する方法について説明する。   A method for producing an optical element using this press mold will be described.

まず、胴型３、下型１および上型２、ガラス素材４が、胴型３に設けられたヒーターによって成形に必要な温度まで加熱される。   First, the body mold 3, the lower mold 1 and the upper mold 2, and the glass material 4 are heated to a temperature necessary for molding by a heater provided in the body mold 3.

つぎに、上型２に対して、図示しないプレス軸より矢印Ｐで示す方向に荷重を加え、ガラス素材４をプレス成形する。ガラス素材４は上型２および下型１の転写面と、胴型３の内側表面３ａを転写され、室温まで冷却することで成形を完了させる。   Next, a load is applied to the upper mold 2 in a direction indicated by an arrow P from a press shaft (not shown) to press-mold the glass material 4. The glass material 4 is transferred onto the transfer surfaces of the upper mold 2 and the lower mold 1 and the inner surface 3a of the barrel mold 3, and is cooled to room temperature to complete the molding.

図２は成形された光学素子１０を示すもので、光学有効部分の外側の非光学有効部分は、胴型３の内側表面３ａを転写した外周面１１を有する。   FIG. 2 shows the molded optical element 10, and the non-optically effective portion outside the optically effective portion has an outer peripheral surface 11 to which the inner surface 3 a of the body mold 3 is transferred.

すなわち、光学素子１０の外周面１１には、胴型３の内側表面３ａが転写され、胴型３の内側表面３ａと同等に、光軸方向の表面粗さＲａ（２）＝０．５μｍ、円周方向の表面粗さＲａ（１）＝０．０８μｍであり、しかも光学材料は均一に充填されていた。   That is, the inner surface 3a of the body mold 3 is transferred to the outer peripheral surface 11 of the optical element 10, and the surface roughness Ra (2) = 0.5 μm in the optical axis direction is equivalent to the inner surface 3a of the body mold 3. The surface roughness Ra (1) in the circumferential direction was 0.08 μm, and the optical material was uniformly filled.

このように粗面化された光学素子１０の外周面１１は、迷光を抑制するための黒色塗料を良好に塗布することが可能であった。光学素子１０をレンズユニットに組み込み、その性能を評価したところ、ゴースト、フレア等の不具合がなく、外観形状も問題ない良品であることが確認できた。   The outer peripheral surface 11 of the optical element 10 thus roughened can be satisfactorily applied with a black paint for suppressing stray light. When the optical element 10 was incorporated in the lens unit and its performance was evaluated, it was confirmed that the optical element 10 was a non-defective product free from defects such as ghosts and flares and having no problem in appearance.

本実施例において成形される光学材料はガラスであるが、これに限らず、プラスチックや金属であっても良い。   The optical material molded in this embodiment is glass, but is not limited to this, and may be plastic or metal.

本実施例においては、実施例１の型構造の一部を変更し、凹メニス形状を成形する型構造である点だけが実施例１と異なる。他は実施例１と同様である。   The present embodiment is different from the first embodiment only in that it is a mold structure that changes a part of the mold structure of the first embodiment and forms a concave meniscus shape. Others are the same as in the first embodiment.

図３は本実施例による光学素子の製造に用いるプレス成形型（金型）の構成を示す。実施例１の上型２の代わりに上駒２２を用いる。上駒２２は、非光学有効部分を転写するフラット部２２ａを有し、胴型３の内側表面３ａと同様に、フラット部２２ａにおける径方向の表面粗さＲａ（２）＝０．５μｍ、円周方向の表面粗さＲａ（１）＝０．０８μｍである。   FIG. 3 shows the configuration of a press mold (mold) used for manufacturing the optical element according to this embodiment. The upper piece 22 is used instead of the upper mold 2 of the first embodiment. The upper piece 22 has a flat portion 22a for transferring a non-optically effective portion. Similar to the inner surface 3a of the body mold 3, the surface roughness Ra (2) in the radial direction of the flat portion 22a = 0.5 μm, a circle The circumferential surface roughness Ra (1) = 0.08 μm.

図４に示すように、成形品である光学素子３０は、外周面３１と上面側のフラット部３２において上記のプレス成形型と同等の表面粗さを有する。   As shown in FIG. 4, the optical element 30 that is a molded product has a surface roughness equivalent to that of the press mold described above at the outer peripheral surface 31 and the flat portion 32 on the upper surface side.

光学素子３０を実施例１と同様に評価したところ、良品であることが確認できた。   When the optical element 30 was evaluated in the same manner as in Example 1, it was confirmed that the optical element 30 was a non-defective product.

（比較例）
実施例１と同様のプレス成形型において、胴型の内側表面の表面粗さが光軸方向にＲａ（２）＝０．７μｍ、円周方向にＲａ（１）＝０．００９μｍ、０．０１μｍ、０．５μｍ、０．６μｍにそれぞれ加工された胴型サンプルＳ１〜Ｓ４を用意した。 (Comparative example)
In the same press mold as in Example 1, the surface roughness of the inner surface of the barrel die is Ra (2) = 0.7 μm in the optical axis direction, and Ra (1) = 0.09 μm, 0.01 μm in the circumferential direction. , 0.5 μm and 0.6 μm were prepared, respectively.

胴型サンプルＳ１〜Ｓ４を用いてプレス成形した成形品である光学素子の評価を実施例１と同様に行った結果を表１に示す。判定は得られた光学素子が良品である場合を○、不良である場合を×とした。   Table 1 shows the results of evaluation of the optical element, which is a molded product press-molded using the barrel samples S1 to S4, in the same manner as in Example 1. In the determination, the case where the obtained optical element is a non-defective product was marked with ◯, and the case where it was defective was marked with ×.

Figure 2008094658
Figure 2008094658

表１より、Ｒａ（１）が０．０１μｍ以上、０．５μｍ以下であれば成形品が良品として得られることがわかる。   From Table 1, it can be seen that if Ra (1) is 0.01 μm or more and 0.5 μm or less, a molded product can be obtained as a good product.

また、同様に胴型の内側表面の表面粗さをＲａ（１）＝０．０１μｍ、Ｒａ（２）＝１．１１μｍとした胴型サンプルＳ５と、Ｒａ（１）＝０．０１μｍ、Ｒａ（２）＝１μｍとした胴型サンプルＳ６を用意した。また、Ｒａ（１）＝０．５μｍ、Ｒａ（２）＝０．６２５μｍとした胴型サンプルＳ７と、Ｒａ（１）＝０．５μｍ、Ｒａ（２）＝０．５５５μｍとした胴型サンプルＳ８を用意した。胴型サンプルＳ５〜Ｓ８を用いて、それぞれ実施例１と同様に成形および評価を行った。その結果を表２に示す。判定は得られた光学素子が良品である場合を○、不良である場合を×とした。   Similarly, a barrel sample S5 having a surface roughness Ra (1) = 0.01 μm and Ra (2) = 1.11 μm, and Ra (1) = 0.01 μm, Ra ( 2) A body sample S6 having a thickness of 1 μm was prepared. Also, a barrel sample S7 with Ra (1) = 0.5 μm and Ra (2) = 0.625 μm, and a barrel sample S8 with Ra (1) = 0.5 μm and Ra (2) = 0.555 μm. Prepared. Molding and evaluation were performed in the same manner as in Example 1 using the trunk samples S5 to S8. The results are shown in Table 2. In the determination, the case where the obtained optical element is a non-defective product was marked with ◯, and the case where it was defective was marked with ×.

Figure 2008094658
Figure 2008094658

表２より、Ｒａ（１）／Ｒａ（２）が０．０１以上、０．９以下であれば成形品が良品となることがわかる。   From Table 2, it can be seen that if Ra (1) / Ra (2) is 0.01 or more and 0.9 or less, the molded product is a good product.

実施例１における光学素子の製造に用いるプレス成形型の構成を示す模式断面図である。2 is a schematic cross-sectional view showing a configuration of a press mold used for manufacturing an optical element in Example 1. FIG. 実施例１による光学素子を示す模式断面図である。1 is a schematic cross-sectional view showing an optical element according to Example 1. FIG. 実施例２における光学素子の製造に用いるプレス成形型の構成を示す模式断面図である。6 is a schematic cross-sectional view showing a configuration of a press mold used for manufacturing an optical element in Example 2. FIG. 実施例２による光学素子を示す模式断面図である。6 is a schematic cross-sectional view showing an optical element according to Example 2. FIG. 一従来例によるプレス成形型を示す模式断面図である。It is a schematic cross section which shows the press molding die by one prior art example.

符号の説明Explanation of symbols

１ 下型
２ 上型
３ 胴型
３ａ 内側表面
１０ 光学素子
２２ 上駒
２２ａ フラット部 1 Lower mold 2 Upper mold 3 Body mold 3a Inner surface 10 Optical element 22 Upper frame 22a Flat part

Claims (4)

金型を用いたモールド成形によって光学素子を形成する工程を有し、
前記光学素子の非光学有効部分に対応する前記金型の転写面において、前記転写面の円周方向に測定した表面粗さと、光軸方向または径方向に測定した表面粗さとの間に以下の２式で表わされる関係が成立することを特徴とする光学素子の製造方法。
０．０１≦Ｒａ（１）／Ｒａ（２）＜０．９
０．０１μｍ≦Ｒａ（１）≦０．５μｍ
ここで、Ｒａ（１）：円周方向に測定した表面粗さＲａ
Ｒａ（２）：光軸方向または径方向に測定した表面粗さＲａ Having a step of forming an optical element by molding using a mold,
In the transfer surface of the mold corresponding to the non-optically effective portion of the optical element, between the surface roughness measured in the circumferential direction of the transfer surface and the surface roughness measured in the optical axis direction or radial direction, the following: A method for manufacturing an optical element, characterized in that the relationship represented by formula (2) holds.
0.01 ≦ Ra (1) / Ra (2) <0.9
0.01 μm ≦ Ra (1) ≦ 0.5 μm
Here, Ra (1): surface roughness Ra measured in the circumferential direction
Ra (2): Surface roughness Ra measured in the optical axis direction or radial direction 光学有効部分の外側に非光学有効部分を備えた光学素子において、前記非光学有効部分の円周方向に測定した表面粗さと、光軸方向または径方向に測定した表面粗さとの間に以下の２式で表わされる関係が成立することを特徴とする光学素子。
０．０１≦Ｒａ（１）／Ｒａ（２）＜０．９
０．０１μｍ≦Ｒａ（１）≦０．５μｍ
ここで、Ｒａ（１）：円周方向に測定した表面粗さＲａ
Ｒａ（２）：光軸方向または径方向に測定した表面粗さＲａ In an optical element having a non-optical effective portion outside the optical effective portion, the following is between the surface roughness measured in the circumferential direction of the non-optical effective portion and the surface roughness measured in the optical axis direction or radial direction: An optical element characterized in that the relationship represented by formula (2) holds.
0.01 ≦ Ra (1) / Ra (2) <0.9
0.01 μm ≦ Ra (1) ≦ 0.5 μm
Here, Ra (1): surface roughness Ra measured in the circumferential direction
Ra (2): Surface roughness Ra measured in the optical axis direction or radial direction 前記光学素子の素材が、ガラス素材であることを特徴とする請求項２記載の光学素子。   The optical element according to claim 2, wherein a material of the optical element is a glass material. 前記光学素子の前記非光学有効部分に黒色塗料が塗布されていることを特徴とする請求項２または３記載の光学素子。   The optical element according to claim 2, wherein a black paint is applied to the non-optically effective portion of the optical element.
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US8390930B2 (en) 2008-11-20 2013-03-05 Omnivision Technologies, Inc. Optical element and manufacture method thereof
WO2014050602A1 (en) * 2012-09-29 2014-04-03 コニカミノルタ株式会社 Lens and molding die
JP2016216317A (en) * 2015-05-25 2016-12-22 オリンパス株式会社 Molding setting for optical element molding and production method of optical element
US11785323B1 (en) 2022-05-27 2023-10-10 Samsung Electronics Co., Ltd. Camera module including refractive member and electronic device including refractive member

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JP2001052333A (en) * 1999-08-09 2001-02-23 Fuji Electric Co Ltd Plastic disk substrate of magnetic recording medium and metal mold for molding the same
JP2007296839A (en) * 2006-04-06 2007-11-15 Fuji Xerox Co Ltd Cylindrical core body and method for manufacturing endless belt using cylindrical core body

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JPS6461328A (en) * 1987-09-02 1989-03-08 Olympus Optical Co Glass lens and device for forming thereof
JP2001052333A (en) * 1999-08-09 2001-02-23 Fuji Electric Co Ltd Plastic disk substrate of magnetic recording medium and metal mold for molding the same
JP2007296839A (en) * 2006-04-06 2007-11-15 Fuji Xerox Co Ltd Cylindrical core body and method for manufacturing endless belt using cylindrical core body

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8390930B2 (en) 2008-11-20 2013-03-05 Omnivision Technologies, Inc. Optical element and manufacture method thereof
WO2014050602A1 (en) * 2012-09-29 2014-04-03 コニカミノルタ株式会社 Lens and molding die
JP2016216317A (en) * 2015-05-25 2016-12-22 オリンパス株式会社 Molding setting for optical element molding and production method of optical element
US11785323B1 (en) 2022-05-27 2023-10-10 Samsung Electronics Co., Ltd. Camera module including refractive member and electronic device including refractive member
US12041333B2 (en) 2022-05-27 2024-07-16 Samsung Electronics Co., Ltd. Camera module including refractive member and electronic device including refractive member

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