JP4573485B2 - Mold for optical element with lens barrel - Google Patents

Mold for optical element with lens barrel Download PDF

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Publication number
JP4573485B2
JP4573485B2 JP2001297483A JP2001297483A JP4573485B2 JP 4573485 B2 JP4573485 B2 JP 4573485B2 JP 2001297483 A JP2001297483 A JP 2001297483A JP 2001297483 A JP2001297483 A JP 2001297483A JP 4573485 B2 JP4573485 B2 JP 4573485B2
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Prior art keywords
lens barrel
mold
fitting portion
optical element
outer peripheral
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JP2003104738A (en
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正明 福田
英俊 菅井
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Fujifilm Corp
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Fujifilm Corp
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
    • C03B11/06—Construction of plunger or mould
    • C03B11/08—Construction of plunger or mould for making solid articles, e.g. lenses
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2215/00—Press-moulding glass
    • C03B2215/40—Product characteristics
    • C03B2215/46—Lenses, e.g. bi-convex
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2215/00—Press-moulding glass
    • C03B2215/72—Barrel presses or equivalent, e.g. of the ring mould type
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2215/00—Press-moulding glass
    • C03B2215/79—Uniting product and product holder during pressing, e.g. lens and lens holder

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Lens Barrels (AREA)

Description

【０００１】
【発明の属する技術分野】
この発明は、成形型内にセットした鏡筒内に光学素材（ないしはガラス素材）を配置し、加熱しながら上型と下型で加圧し、鏡筒内に光学素子（ないしはガラス成形品）が一体成形された鏡筒付き光学素子を成形するための成形型に関する。
【０００２】
【従来の技術】
近年、光学素材（ないしはガラス素材）を加熱炉内で加熱軟化した後、上型と下型で加圧して光学素子（ないしはガラス成形品）を成形するにあたって、胴型と上型と下型とを備えた成形型内に鏡筒をセットするとともに、この鏡筒内に光学素材（ないしはガラス素材）を配置し、前記上型と下型で光学素材（ないしはガラス素材）を挟み込んで加熱し加圧することにより、光学素材（ないしはガラス素材）を外周方向に流動させて、その外周縁を鏡筒の内周面に密着結合させ、鏡筒内に光学素子を一体成形させるといった鏡筒付き光学素子の製造方法が用いられるようになった。（特開昭６０−１２９２２０号公報）
【０００３】
【発明が解決しようとする課題】
上述した鏡筒付き光学素子の製造方法では、成形型内にセットされた鏡筒に対して光学素子を一体成形するものであり、鏡筒内に一体成形される光学素子の光軸ズレや位置ズレを防止するため、成形型内にセットされる鏡筒の安定した保持が重要である。下型の転写面上に配置された光学素材（ないしはガラス素材）を、下型と上型とで挟み込んで加熱し加圧して鏡筒内で一体成形する成形型では、鏡筒内に成形される光学素子の光軸が、下型の中心軸と鏡筒との配置関係によって決定される。そこで成形型内にセットする鏡筒を、下型の中心軸と平行に形成された下型の外周面と鏡筒の内周面とを密着させ、なおかつ鏡筒の下部端面を下型の中心軸と垂直な面に密着させることが望まれる。
しかしながら、下型の前記外周面と前記垂直な面とが交差する部分は、加工上の問題から垂直に形成するこができない。従って、鏡筒の内周面及び下部端面を前記外周面及び前記垂直な面に密着させることができず、安定した保持ができないという不具合が生じていた。
【０００４】
そこで、この発明は、鏡筒付き光学素子の製造にあたって、鏡筒を安定に保持し、鏡筒内に形成される光学素子の光軸ズレや位置ズレを防止した鏡筒付き光学素子の成形型を提供とすることを目的とする。
【０００５】
【課題を解決するための手段】
上述の目的を達成するため、この発明は、筒状の胴型と、この胴型内を摺動する上型と下型とを備えた成形型内に鏡筒をセットするとともに、この鏡筒内に光学素材を配置し、転写面を有する上型と下型とで光学素材を挟み込んで、加熱し、加圧することにより鏡筒内に光学素子を一体成形する鏡筒付き光学素子の成形型において、下型の上面に鏡筒を載置する基準面を設けるとともに、前記下型の上面の中央部分を軸方向に突出させ、前記基準面に対して垂直な外周面と、上面中央部分に転写面とを備えた円柱状の嵌合部を形成し、この嵌合部の外径を鏡筒の内径に合わせて設計するとともに、基準面が交差する嵌合部の下端外周面に、嵌合部の外周面に沿って一周する溝を形成したものである。
【０００６】
以下にこの発明の好適な実施例を図面を参照して説明する。
【０００７】
図１は、この発明の実施例における鏡筒付き光学素子の成形型の断面図を示すものであり、胴型１と上型２と下型３とを備えた成形型内にセットされた鏡筒１０の、上方先端側の内周面に光学素子を密着結合させた鏡筒付き光学素子を成形するための成形型を示す。
この成形型は、筒状の胴型１と、円柱状の上型２と下型３とを備え、筒状の胴型１内を摺動する上型２と下型３とによって、鏡筒１０内に配置される光学素材（ないしはガラス素材）２０を挟み込んで加熱し、加圧することにより、光学素材２０に転写面２Ａ、３Ａを転写して光学機能面を形成するとともに、光学素材２０を外周方向に流動させてその外周縁を鏡筒１０の内周面に密着結合させ、鏡筒内に光学素子が一体成形された鏡筒付き光学素子を製造する。
なお成形型として、タングステンカーバイドのような超硬部材からなる胴型１、上型２、下型３を用いる。
【０００８】
この発明の成形型は、転写面３Ａと、鏡筒１０を載置する基準面３１と、鏡筒１０の内周に嵌合される嵌合部３２とを備えた下型３を使用し、この下型３の嵌合部３２の外周に鏡筒１０を嵌合して鏡筒１０を保持するとともに、基準面３１に鏡筒１０を載置することによって、転写面３Ａに対して鏡筒１０を位置ズレすることなく保持するものである。
【０００９】
タングステンカーバイドのような超硬部材からなる下型３は、加工工具を用いて研削加工される。
図２は研削加工した下型３の断面図を示すものであって、下型３の上面に鏡筒１０が載置される基準面３１を形成するとともに、下型３の上面の中央部分が軸方向に突出し、前記基準面３１に対して垂直な外周面と、上面中央部分に転写面３Ａとを備えた円柱状の嵌合部３２を形成してある。
【００１０】
この発明による成形型の下型３は、下型３の上面中央部分を軸方向に突出させて形成した嵌合部３２の外周に鏡筒１０を嵌合することによって鏡筒１０を保持し、下型３の上面の嵌合部外周に形成した基準面３１に鏡筒１０を載置するものであって、基準面３１に鏡筒１０を載置することよって、嵌合部３２の上面中央部に形成してある転写面３Ａが鏡筒内の光学素子形成位置に配置されるように形成してある。つまり、基準面３１に鏡筒１０を載置することよって鏡筒内に形成される光学素子の位置ズレを防止する。
【００１１】
また嵌合部３２の外周に嵌合された鏡筒１０が安定して基準面３１に載置されるように、前記鏡筒１０が載置される基準面３１に対して垂直な外周面を有する円柱状の嵌合部３２を形成するとともに、嵌合部３２の外周に保持される鏡筒１０の位置ズレを防止するため、鏡筒１０の内径に合わせて嵌合部３２の外径を設計し、鏡筒内に形成される光学素子の光軸ズレを防止する。
【００１２】
しかしながら、図２に示すように、基準面３１に対して垂直方向に突出する嵌合部３２を有する下型３を加工工具を用いて研削加工した場合、基準面３１に対して垂直に突出させて形成した嵌合部３２の外周面と、基準面３１とが交差する個所に、なだらかに勾配する肩部Ｒが形成され、直角部が形成されない。これは加工工具の先端はある程度の強度を持たせるために先端を尖らせることが不可能であり、そのため加工工具先端が丸みを帯びた形状に形成されていることが原因である。
【００１３】
例えば、図２に示す実施例は、外径φ３．３ｍｍの嵌合部３２に、外径φ３．７５ｍｍの鏡筒１０を嵌合した、鏡筒の薄肉部における壁厚が約０．２２５ｍｍ以下である小型の鏡筒付き光学素子を製造するものであって、嵌合部３２の外周面と基準面３１とが交差する個所に形成された肩部Ｒによって、鏡筒下端（衝面）が基準面３１に接地せず、基準面３１から約０．２ｍｍ上方にずれて鏡筒１０がセットされる。つまり鏡筒内に形成される光学素子の軸方向の位置ズレ（約０．２ｍｍ）が発生する。このような小さな位置ズレでも、小型の鏡筒付き光学素子では光学機能が低下して障害が発生する。
またこの実施例では、肩部Ｒによって鏡筒１０の基準面３１に対する設置状態が不安定となり、鏡筒内に形成される光学素子の光軸が傾く虞がある。
【００１４】
すなわち、嵌合部３２の外径を鏡筒１０の内径に合わせて設計し（嵌合部３２の外径を鏡筒１０の内径と同等に設計し）、この嵌合部３２の外周に鏡筒１０を嵌合することによって、嵌合部３２に保持された鏡筒の水平方向の位置ズレが防止され、鏡筒内に一体成形される光学素子の光軸ズレが防止される下型３において、この嵌合部３２外周面と基準面３１とが交差する個所に、なだらかに勾配する肩部Ｒが形成されていると、この肩部Ｒによって基準面３１に鏡筒１０下端が接地せず、鏡筒内に一体成形される光学素子の軸方向の位置ズレが発生する。
【００１５】
一方、前記肩部Ｒを避けて、基準面３１に鏡筒１０を設置しようとすると、鏡筒１０の内径を嵌合部３２の外径よりも大きく設計しなくてはならず、嵌合部３２と鏡筒１０の内周面とが密着せず、水平方向の位置ズレが発生してしまう。さらに小型の鏡筒付き光学素子を形成する場合、基準面３１における嵌合部３２と交差する側からその反対側の基準面端部までの長さ、つまり鏡筒１０が載置される基準面３１の幅を大きくできないため、肩部Ｒを避けようとすると、基準面３１に鏡筒１０が載らず、脱落してしまう可能性もある。
【００１６】
また小型の鏡筒付き光学素子の製造においては、鏡筒１０の壁厚も薄いため、成形型内に鏡筒１０をセットして加熱しながら鏡筒内に配置された光学素材２０を上型２と下型３とで挟み込んで加熱し加圧するとき、嵌合部３２の下端外周面に形成された肩部Ｒの形状に沿って、鏡筒１０が変形してしまう虞もある。
【００１７】
さらに、壁厚が薄い鏡筒１０を有する小型の鏡筒付き光学素子を製造する場合、壁厚が薄い鏡筒１０下端（衝面）を肩部Ｒの形状に合わせて面取りすると、鏡筒１０下端に平坦部がなくなって尖角し、製造した鏡筒付き光学素子の鏡筒下端が尖って形成されてしまい、安定した状態で保持できず、正確な位置決めも不可能となってしまう。
【００１８】
そこで、この発明による成形型の下型３は、基準面３１が交差する嵌合部３２の下端外周面に、嵌合部３２の外周面に沿って一周する溝３３を形成し、基準面３１と嵌合部３２の外周面の交差する個所に形成された肩部Ｒを取除き、嵌合部３２の外周に嵌合され保持された鏡筒１０の下端を、嵌合部３２の外周面に対して垂直に形成された基準面３１に接地させたものである。
【００１９】
図３は、この発明による成形型の下型３の断面図を示すものであって、図２に示す下型３の肩部Ｒを除去するため、嵌合部３２の下端外周面に、前記嵌合部３２の外周面に沿って一周する溝３３を研削したものである。
すなわち、転写面３Ａ及び、基準面３１、嵌合部３２を備えた下型３を金型で成形した後、基準面３１に対して垂直方向に突出させた嵌合部３２の下端外周面に、前記嵌合部３２の外周面に沿って一周する溝３３を、下型３の中心軸に向かって研削したものである。
【００２０】
なお、嵌合部３２の下端外周面を下型３の中心軸に向かって前記嵌合部３２の外周面に沿って一周する溝３３は、基準面３１に沿った入射角度（下型３の中心軸に対して直角に交わる入射角度）で研削刃を嵌合部３２の下端外周面に当接させ研削してもよいが、基準面３１に対して若干傾斜するような入射角度（下型３の中心軸に対して傾斜して交わる入射角度）で研削刃を嵌合部３２の下端外周面に当接させ、下型３の中心軸に向かって研削することが好ましい。
【００２１】
図３に示すように、基準面３１が交差する嵌合部３２の下端外周面に、嵌合部３２の外周面に沿って一周する溝３３を形成して、肩部Ｒを取除くことによって、下型３の上面を軸方向に突出させた嵌合部３２の外周に鏡筒１０を嵌合するとともに、基準面３１に鏡筒１０の下端を確実に接地でき、鏡筒内に一体成形される光学素子の光軸ズレや位置ズレを防止した鏡筒付き光学素子を製造することができる。
【００２２】
すなわちこの発明では、転写面を有する下型に基準面と嵌合部を形成し、嵌合部の外周に鏡筒を嵌合するとともに、基準面に鏡筒を載置することによって、下型で鏡筒を保持し、鏡筒内に形成される光学素子の位置ズレ及び光軸ズレを防止する成形型において、前記基準面に対して垂直な外周面と、上面中央部分に転写面とを備えた、円柱状の嵌合部の外径を鏡筒の内径に合わせて設計ことによって、嵌合部の外周に嵌合される鏡筒が確実に保持され、鏡筒内に形成される光学素子の光軸ズレを防止するとともに、基準面が交差する嵌合部の下端外周面を中心軸に向かって研削し、嵌合部の外周面に沿って一周する溝を形成ことによって、基準面と嵌合部の外周面が交差する個所に形成される肩部Ｒを取除き、前記基準面に鏡筒下端を確実に接地させ、鏡筒内に形成される光学素子の位置ズレを防止する。
従って発明による成形型を使用することによって、前記肩部Ｒによって発生した鏡筒内に形成される光学素子の位置ズレを防止し、精度の高い小型の鏡筒付き光学素子を提供することができる。
【図面の簡単な説明】
【図１】本発明による成形型の断面図。
【図２】金型で成形した下型の断面図。
【図３】本発明による成形型の下型の断面図。
【符号の説明】
１ 胴型
２ 上型
２Ａ 転写面
３ 下型
３Ａ 転写面
３１ 基準面
３２ 嵌合部
１０ 鏡筒
２０ 光学素材（ないしはガラス素材）[0001]
BACKGROUND OF THE INVENTION
In this invention, an optical material (or glass material) is placed in a lens barrel set in a mold, and the upper die and the lower die are pressurized while heating, and an optical element (or glass molded product) is placed in the lens barrel. The present invention relates to a molding die for molding an optical element with a lens barrel that is integrally molded.
[0002]
[Prior art]
In recent years, an optical material (or glass material) is heated and softened in a heating furnace, and then pressed with an upper mold and a lower mold to form an optical element (or glass molded product). The lens barrel is set in a mold equipped with an optical material (or glass material), and the optical material (or glass material) is sandwiched between the upper mold and the lower mold and heated. By pressing, the optical material (or glass material) flows in the outer peripheral direction, the outer peripheral edge is closely bonded to the inner peripheral surface of the lens barrel, and the optical element is integrally formed in the lens barrel. The manufacturing method has been used. (Japanese Patent Laid-Open No. 60-129220)
[0003]
[Problems to be solved by the invention]
In the method of manufacturing an optical element with a lens barrel described above, an optical element is integrally molded with respect to a lens barrel set in a molding die, and an optical axis shift and position of the optical element integrally molded in the lens barrel. In order to prevent displacement, it is important to stably hold the lens barrel set in the mold. An optical material (or glass material) placed on the transfer surface of the lower mold is sandwiched between the lower mold and the upper mold, heated, pressurized, and integrally molded in the lens barrel. The optical axis of the optical element is determined by the positional relationship between the center axis of the lower mold and the lens barrel. Therefore, the lens barrel set in the mold is brought into close contact with the outer peripheral surface of the lower mold formed in parallel with the central axis of the lower mold and the inner peripheral surface of the lens barrel, and the lower end face of the lens barrel is the center of the lower mold. It is desirable to make it adhere to a surface perpendicular to the axis.
However, a portion where the outer peripheral surface and the vertical surface of the lower mold intersect cannot be formed vertically due to processing problems. Therefore, the inner peripheral surface and the lower end surface of the lens barrel cannot be brought into close contact with the outer peripheral surface and the vertical surface, resulting in a problem that stable holding cannot be performed.
[0004]
Accordingly, the present invention provides a mold for optical element with a lens barrel that stably holds the lens barrel and prevents optical axis shift and position shift of the optical element formed in the lens barrel in the manufacture of the optical element with lens barrel. The purpose is to provide.
[0005]
[Means for Solving the Problems]
In order to achieve the above-described object, the present invention sets a lens barrel in a mold having a cylindrical body mold, and an upper mold and a lower mold that slide in the cylinder mold. A mold for an optical element with a lens barrel, in which an optical material is placed inside, and the optical material is sandwiched between an upper mold and a lower mold having a transfer surface, heated and pressurized to integrally mold the optical element in the lens barrel. In addition, a reference surface for mounting the lens barrel is provided on the upper surface of the lower die, and a central portion of the upper surface of the lower die is protruded in the axial direction, and an outer peripheral surface perpendicular to the reference surface and a central portion of the upper surface A cylindrical fitting portion having a transfer surface is formed, the outer diameter of the fitting portion is designed to match the inner diameter of the lens barrel, and the fitting is fitted to the outer peripheral surface at the lower end of the fitting portion where the reference plane intersects. A groove that makes a round along the outer peripheral surface of the joint is formed.
[0006]
Preferred embodiments of the present invention will be described below with reference to the drawings.
[0007]
FIG. 1 shows a cross-sectional view of a mold for an optical element with a lens barrel according to an embodiment of the present invention, in which a mirror set in a mold having a barrel mold 1, an upper mold 2 and a lower mold 3 is shown. 2 shows a mold for molding an optical element with a lens barrel in which an optical element is tightly coupled to the inner peripheral surface of the upper end side of the cylinder 10.
The mold includes a cylindrical body mold 1, a cylindrical upper mold 2, and a lower mold 3, and an upper mold 2 and a lower mold 3 that slide in the cylindrical body mold 1, thereby providing a lens barrel. The optical material (or glass material) 20 disposed in 10 is sandwiched, heated, and pressurized to transfer the transfer surfaces 2A and 3A to the optical material 20 to form an optical functional surface. By flowing in the outer peripheral direction, the outer peripheral edge thereof is tightly coupled to the inner peripheral surface of the lens barrel 10 to produce an optical element with a lens barrel in which the optical element is integrally formed in the lens barrel.
As the mold, a body mold 1, an upper mold 2, and a lower mold 3 made of a cemented carbide member such as tungsten carbide are used.
[0008]
The molding die of the present invention uses the lower die 3 provided with a transfer surface 3A, a reference surface 31 on which the lens barrel 10 is placed, and a fitting portion 32 fitted to the inner periphery of the lens barrel 10, The lens barrel 10 is fitted to the outer periphery of the fitting portion 32 of the lower mold 3 to hold the lens barrel 10, and the lens barrel 10 is placed on the reference surface 31, whereby the lens barrel is placed on the transfer surface 3A. 10 is held without being displaced.
[0009]
The lower mold 3 made of a cemented carbide member such as tungsten carbide is ground using a processing tool.
FIG. 2 is a cross-sectional view of the lower mold 3 that has been ground. The reference surface 31 on which the lens barrel 10 is placed is formed on the upper surface of the lower mold 3, and the central portion of the upper surface of the lower mold 3 is A cylindrical fitting portion 32 that protrudes in the axial direction and has an outer peripheral surface perpendicular to the reference surface 31 and a transfer surface 3A at the center of the upper surface is formed.
[0010]
The lower die 3 of the molding die according to the present invention holds the lens barrel 10 by fitting the lens barrel 10 to the outer periphery of the fitting portion 32 formed by projecting the central portion of the upper surface of the lower die 3 in the axial direction. The lens barrel 10 is placed on the reference surface 31 formed on the outer periphery of the fitting portion on the upper surface of the lower mold 3. By placing the lens barrel 10 on the reference surface 31, the center of the upper surface of the fitting portion 32 is placed. The transfer surface 3A formed in the part is formed so as to be arranged at the optical element forming position in the lens barrel. That is, by placing the lens barrel 10 on the reference surface 31, the positional deviation of the optical elements formed in the lens barrel is prevented.
[0011]
Further, an outer peripheral surface perpendicular to the reference surface 31 on which the lens barrel 10 is placed is arranged so that the lens barrel 10 fitted to the outer periphery of the fitting portion 32 is stably placed on the reference surface 31. In order to form the cylindrical fitting portion 32 having the above and to prevent displacement of the lens barrel 10 held on the outer periphery of the fitting portion 32, the outer diameter of the fitting portion 32 is adjusted to the inner diameter of the lens barrel 10. The optical axis of the optical element formed in the lens barrel is designed and prevented.
[0012]
However, as shown in FIG. 2, when the lower mold 3 having the fitting portion 32 protruding in the vertical direction with respect to the reference surface 31 is ground by using a processing tool, the lower mold 3 is protruded perpendicular to the reference surface 31. A shoulder portion R that gently slopes is formed at a location where the outer peripheral surface of the fitting portion 32 formed in this way and the reference surface 31 intersect, and a right-angle portion is not formed. This is because the tip of the processing tool cannot be sharpened because the tip of the processing tool has a certain degree of strength, and therefore the tip of the processing tool is formed in a rounded shape.
[0013]
For example, in the embodiment shown in FIG. 2, the wall thickness at the thin wall portion of the lens barrel in which the lens barrel 10 with the outer diameter φ3.75 mm is fitted to the fitting portion 32 with the outer diameter φ3.3 mm is about 0.225 mm or less. And a lower end (impact surface) of the lens barrel is formed by a shoulder R formed at a location where the outer peripheral surface of the fitting portion 32 and the reference surface 31 intersect. The lens barrel 10 is set without being grounded to the reference surface 31 and shifted upward by about 0.2 mm from the reference surface 31. That is, an axial displacement (about 0.2 mm) of the optical element formed in the lens barrel occurs. Even with such a small misalignment, the optical function of a small optical element with a lens barrel deteriorates and a failure occurs.
Further, in this embodiment, the installation state of the lens barrel 10 with respect to the reference surface 31 becomes unstable due to the shoulder R, and the optical axis of the optical element formed in the lens barrel may be inclined.
[0014]
In other words, the outer diameter of the fitting portion 32 is designed to match the inner diameter of the lens barrel 10 (the outer diameter of the fitting portion 32 is designed to be equal to the inner diameter of the lens barrel 10), and the outer periphery of the fitting portion 32 is mirrored. By fitting the tube 10, the horizontal displacement of the lens barrel held in the fitting portion 32 is prevented, and the optical axis displacement of the optical element integrally formed in the lens barrel is prevented. In this case, when a gently sloping shoulder portion R is formed at the intersection of the outer peripheral surface of the fitting portion 32 and the reference surface 31, the lower end of the lens barrel 10 is grounded to the reference surface 31 by the shoulder portion R. In other words, the axial displacement of the optical element integrally formed in the lens barrel occurs.
[0015]
On the other hand, if the lens barrel 10 is to be installed on the reference surface 31 while avoiding the shoulder R, the inner diameter of the lens barrel 10 must be designed to be larger than the outer diameter of the fitting portion 32, and the fitting portion 32 and the inner peripheral surface of the lens barrel 10 are not in close contact with each other, and a horizontal displacement occurs. Further, when forming a compact optical element with a lens barrel, the length from the side crossing the fitting portion 32 in the reference surface 31 to the reference surface end on the opposite side, that is, the reference surface on which the lens barrel 10 is placed. Since the width of 31 cannot be increased, if the shoulder R is to be avoided, the lens barrel 10 may not be placed on the reference surface 31 and may fall off.
[0016]
Further, in the manufacture of a small optical element with a lens barrel, since the wall thickness of the lens barrel 10 is also thin, the optical material 20 placed in the lens barrel while the lens barrel 10 is set in a mold and heated is used as an upper mold. When sandwiched between 2 and the lower mold 3 and heated and pressurized, the lens barrel 10 may be deformed along the shape of the shoulder portion R formed on the outer peripheral surface of the lower end of the fitting portion 32.
[0017]
Further, when manufacturing a small optical element with a lens barrel having a lens barrel 10 with a thin wall thickness, if the lower end (impact surface) of the lens barrel 10 with a small wall thickness is chamfered according to the shape of the shoulder R, the lens barrel 10 A flat part is lost at the lower end and the tip is sharpened, and the lower end of the lens barrel of the manufactured optical element with the lens barrel is sharply formed, so that it cannot be held in a stable state, and accurate positioning is impossible.
[0018]
Therefore, the lower mold 3 of the molding die according to the present invention forms a groove 33 that goes around the outer peripheral surface of the fitting portion 32 on the outer peripheral surface of the lower end of the fitting portion 32 where the reference surface 31 intersects. The shoulder portion R formed at a location where the outer peripheral surface of the fitting portion 32 intersects is removed, and the lower end of the lens barrel 10 fitted and held on the outer periphery of the fitting portion 32 is connected to the outer peripheral surface of the fitting portion 32. Is grounded to a reference plane 31 formed perpendicular to the reference plane 31.
[0019]
3 is a sectional view of the lower mold 3 of the molding die according to the present invention. In order to remove the shoulder R of the lower mold 3 shown in FIG. The groove 33 that goes around the outer peripheral surface of the fitting portion 32 is ground.
That is, after the lower surface 3 provided with the transfer surface 3A, the reference surface 31, and the fitting portion 32 is molded with a mold, the lower end outer peripheral surface of the fitting portion 32 protruded in the direction perpendicular to the reference surface 31 is formed. The groove 33 that goes around along the outer peripheral surface of the fitting portion 32 is ground toward the central axis of the lower mold 3.
[0020]
In addition, the groove 33 that makes a round along the outer peripheral surface of the fitting portion 32 toward the central axis of the lower die 3 on the lower end outer peripheral surface of the fitting portion 32 is an incident angle along the reference surface 31 (of the lower die 3 Grinding may be performed by bringing the grinding blade into contact with the outer peripheral surface of the lower end of the fitting portion 32 at an incident angle that intersects at a right angle with respect to the central axis. It is preferable to grind toward the central axis of the lower mold 3 by bringing the grinding blade into contact with the outer peripheral surface of the lower end of the fitting portion 32 at an incident angle inclined with respect to the central axis 3.
[0021]
As shown in FIG. 3, by forming a groove 33 that goes around the outer peripheral surface of the fitting portion 32 on the outer peripheral surface of the lower end of the fitting portion 32 where the reference surface 31 intersects, and removing the shoulder R The lens barrel 10 can be fitted to the outer periphery of the fitting portion 32 in which the upper surface of the lower mold 3 is protruded in the axial direction, and the lower end of the lens barrel 10 can be securely grounded to the reference surface 31 and is integrally formed in the lens barrel. It is possible to manufacture an optical element with a lens barrel that prevents an optical axis shift or a positional shift of the optical element to be manufactured.
[0022]
That is, in this invention, the lower mold is formed by forming the reference surface and the fitting portion on the lower die having the transfer surface, fitting the lens barrel on the outer periphery of the fitting portion, and placing the lens barrel on the reference surface. In the molding die for holding the lens barrel and preventing the positional deviation and the optical axis deviation of the optical element formed in the lens barrel, an outer peripheral surface perpendicular to the reference surface and a transfer surface at the central portion of the upper surface. The optical cylinder formed in the lens barrel is securely held by designing the cylindrical fitting portion with the outer diameter matched to the inner diameter of the lens barrel. The optical axis shift of the element is prevented, and the outer peripheral surface of the lower end of the fitting portion where the reference surface intersects is ground toward the central axis, thereby forming a groove that goes around the outer peripheral surface of the fitting portion. Remove the shoulder R formed at the location where the outer peripheral surface of the fitting part intersects, and ensure that the lower end of the lens barrel is securely on the reference surface Is the earth, to prevent positional deviation of the optical element to be formed in the lens barrel.
Therefore, by using the mold according to the invention, it is possible to prevent the positional deviation of the optical element formed in the lens barrel generated by the shoulder R, and to provide a highly accurate small optical element with a lens barrel. .
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a mold according to the present invention.
FIG. 2 is a cross-sectional view of a lower mold molded with a mold.
FIG. 3 is a cross-sectional view of a lower mold of a mold according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Body type | mold 2 Upper mold | type 2A Transfer surface 3 Lower mold | type 3A Transfer surface 31 Reference surface 32 Fitting part 10 Lens barrel 20 Optical material (or glass material)

Claims (3)

筒状の胴型（１）と、この胴型内を摺動する上型（２）と下型（３）とを備えた成形型内に鏡筒（１０）をセットするとともに、この鏡筒内に光学素材（２０）を配置し、転写面（２Ａ）を有する上型（２）と転写面（３Ａ）を有する下型（３）とで光学素材（２０）を挟み込んで、加熱し、加圧することにより鏡筒内に光学素子を一体成形する鏡筒付き光学素子の成形型において、
下型（３）の上面に鏡筒（１０）を載置する基準面（３１）を設けるとともに、
前記下型（３）の上面の中央部分を軸方向に突出させ、前記基準面（３１）に対して垂直な外周面と、上面中央部分に転写面（３Ａ）とを備えた円柱状の嵌合部（３２）を形成し、
この嵌合部（３２）の外径を鏡筒（１０）の内径に合わせて設計するとともに、基準面（３１）が交差する嵌合部（３２）の下端外周面に、嵌合部（３２）の外周面に沿って一周する溝（３３）を形成したことを特徴とする鏡筒付き光学素子の成形型。The barrel (10) is set in a molding die having a cylindrical barrel die (1) and an upper die (2) and a lower die (3) that slide in the barrel die. An optical material (20) is disposed therein, the optical material (20) is sandwiched between an upper mold (2) having a transfer surface (2A) and a lower mold (3) having a transfer surface (3A), and heated. In the mold of the optical element with the lens barrel that integrally molds the optical element in the lens barrel by applying pressure,
A reference surface (31) for placing the lens barrel (10) is provided on the upper surface of the lower mold (3), and
A cylindrical fitting having a central portion on the upper surface of the lower mold (3) protruding in the axial direction, an outer peripheral surface perpendicular to the reference surface (31), and a transfer surface (3A) at the upper central portion. Forming a joint (32),
The outer diameter of the fitting portion (32) is designed to match the inner diameter of the lens barrel (10), and the fitting portion (32) is formed on the outer peripheral surface of the lower end of the fitting portion (32) where the reference surface (31) intersects. ) Forming a groove (33) that makes a round along the outer peripheral surface of the lens barrel). 転写面（３Ａ）及び、基準面（３１）、嵌合部（３２）を備えた下型（３）を加工形成した後、基準面（３１）に対して垂直方向に突出した嵌合部（３２）の下端外周面に、前記嵌合部（３２）の外周面に沿って一周する溝（３３）を、下型（３）の中心軸に向かって研削することによって形成したことを特徴とする請求項１に記載の鏡筒付き光学素子の成形型。After processing and forming the transfer die (3A), the reference surface (31), and the lower mold (3) provided with the fitting portion (32), the fitting portion protruding in the vertical direction with respect to the reference surface (31) ( The groove (33) that makes a round along the outer peripheral surface of the fitting portion (32) is formed on the outer peripheral surface of the lower end of 32) by grinding toward the central axis of the lower mold (3). The shaping | molding die of the optical element with a lens-barrel of Claim 1 to do. 小型の鏡筒付き光学素子を製造することを特徴とする請求項１又は２に記載の鏡筒付き光学素子の成形型。3. The mold for an optical element with a lens barrel according to claim 1, wherein a small optical element with a lens barrel is manufactured.
JP2001297483A 2001-09-27 2001-09-27 Mold for optical element with lens barrel Expired - Fee Related JP4573485B2 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6345136A (en) * 1986-08-12 1988-02-26 Olympus Optical Co Ltd Forming method for optical element
JPH09194222A (en) * 1996-01-19 1997-07-29 Asahi Optical Co Ltd Molding method for glass optical element and its molding method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6345136A (en) * 1986-08-12 1988-02-26 Olympus Optical Co Ltd Forming method for optical element
JPH09194222A (en) * 1996-01-19 1997-07-29 Asahi Optical Co Ltd Molding method for glass optical element and its molding method

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