JPH0442338B2 - - Google Patents

Info

Publication number
JPH0442338B2
JPH0442338B2 JP9573084A JP9573084A JPH0442338B2 JP H0442338 B2 JPH0442338 B2 JP H0442338B2 JP 9573084 A JP9573084 A JP 9573084A JP 9573084 A JP9573084 A JP 9573084A JP H0442338 B2 JPH0442338 B2 JP H0442338B2
Authority
JP
Japan
Prior art keywords
mold
optical element
molding
upper mold
pressing
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
Application number
JP9573084A
Other languages
Japanese (ja)
Other versions
JPS60239332A (en
Inventor
Fumitaka Yoshimura
Hiroshi Kashiwakura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Priority to JP9573084A priority Critical patent/JPS60239332A/en
Publication of JPS60239332A publication Critical patent/JPS60239332A/en
Publication of JPH0442338B2 publication Critical patent/JPH0442338B2/ja
Granted legal-status Critical Current

Links

Classifications

    • 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
    • C03B2215/47—Bi-concave
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2215/00—Press-moulding glass
    • C03B2215/60—Aligning press die axes
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、光学素子を成形する光学素子成形用
型に関する。詳しくは、一対の型の各々の光軸を
合致させたまま光学素子を加圧成形する型に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical element molding die for molding an optical element. Specifically, the present invention relates to a mold for pressure-molding an optical element while keeping the optical axes of each of the pair of molds coincident.

〔従来技術〕[Prior art]

従来、光学素子特にガラスの加圧成形では、第
１図ａ，ｂに示すように固定型１、下型２、上型
４より成る型で成形され、上型４と下型２の間は
嵌合部を有し、あるいは嵌合部を型の外部に有
し、この嵌合精度により上型４と下型２の光軸を
合致させていた。即ち、固定型１に保持された下
型２に加熱された光学素子の材料であるガラス塊
３を充填して、上型４を油圧シリンダー（図示せ
ず）にて下型２に押圧してレンズ６の球面を成形
していた。上記従来の型において、上型４は固定
型１の内面１ａに嵌合し、所定の軸線O1−O2に
沿つて移動するよう構成されるものであるが、固
定型１と上型４の摺動嵌合部１ｂがあると下型の
軸線と上型の軸線を完全に一致させることが困難
であつた。 Conventionally, in pressure molding of optical elements, especially glass, molding is performed using a mold consisting of a fixed mold 1, a lower mold 2, and an upper mold 4, as shown in FIGS. 1a and 1b. It has a fitting part, or a fitting part is provided outside the mold, and the optical axes of the upper mold 4 and the lower mold 2 are made to coincide with each other by this fitting precision. That is, a lower mold 2 held in a fixed mold 1 is filled with a glass lump 3 which is a heated optical element material, and an upper mold 4 is pressed against the lower mold 2 by a hydraulic cylinder (not shown). The spherical surface of the lens 6 was molded. In the conventional mold described above, the upper mold 4 is configured to fit into the inner surface 1a of the fixed mold 1 and move along the predetermined axis O 1 -O 2 , but the fixed mold 1 and the upper mold 4 With the sliding fitting portion 1b, it was difficult to completely align the axis of the lower die and the axis of the upper die.

下型２の軸線と上型４の軸線が一致しないと、
第２図に示すように、出来たレンズ６は機能面６
ａ，６ｂの球心a1，b1が光軸と一致せず、レンズ
厚T1，T2が異なりレンズ６に偏心を生じること
になる。 If the axis of the lower mold 2 and the axis of the upper mold 4 do not match,
As shown in FIG. 2, the finished lens 6 has a functional surface 6.
The spherical centers a 1 and b 1 of a and 6b do not coincide with the optical axis, and the lens thicknesses T 1 and T 2 are different, causing eccentricity in the lens 6.

又、一面に非球面の機能面を有する光学素子を
成形する場合、非球面の光軸は一つしか存在しな
い為、従来の型による成形では、２つの光学面の
光軸を合致させることは不可能であつた。 Furthermore, when molding an optical element that has an aspherical functional surface on one side, there is only one optical axis of the aspherical surface, so it is difficult to align the optical axes of two optical surfaces with conventional molding. It was impossible.

そこで、光学素子の機能面を偏心させず、しか
も中心厚が、常に一定な光学素子、特に一面に非
球面を有する光学素子を得る成形用型が提案され
ている。 Therefore, a mold for producing an optical element that does not decenter the functional surface of the optical element and has a constant center thickness, particularly an optical element that has an aspherical surface on one surface, has been proposed.

即ち、この従来の成形用型は、第３図に示すよ
うに下型８、胴型９及び上型１２で構成され、上
型１２を押圧して光学素子１０を成形するもので
ある。下型８は光学素子１０に第１機能面を形成
する成形面８ａを有している。成形面８ａは球面
又は非球面に形成されている。 That is, as shown in FIG. 3, this conventional molding mold is composed of a lower mold 8, a body mold 9, and an upper mold 12, and the optical element 10 is molded by pressing the upper mold 12. The lower mold 8 has a molding surface 8a that forms a first functional surface on the optical element 10. The molding surface 8a is formed into a spherical or aspherical surface.

胴型９は光学素子１０の側面１０ａを形成す
る。胴型９には傾斜輪帯９ａが形成されている。
傾斜輪帯９ａは、成形面８ａの光軸O4を中心軸
とし、上型１２の成形面１２ａが傾斜輪帯９ａに
圧接するようになつている。上型１２の成形面１
２ａは球面に形成されていて、光学素子１０に第
２機能面を形成する。O3は上型１２の光軸であ
る。 The barrel mold 9 forms a side surface 10a of the optical element 10. An inclined ring zone 9a is formed in the body mold 9.
The inclined ring zone 9a has the optical axis O4 of the molding surface 8a as its central axis, and the molding surface 12a of the upper mold 12 is in pressure contact with the inclined ring zone 9a. Molding surface 1 of upper mold 12
2a is formed into a spherical surface and forms a second functional surface on the optical element 10. O 3 is the optical axis of the upper die 12.

こうして、上型１２の成形面１２ａを胴型９の
傾斜輪帯９ａに圧接することにより、機能面に偏
心がなく、しかも中心厚が常に一定な光学素子１
０を成形することができる。 In this way, by press-contacting the molding surface 12a of the upper mold 12 to the inclined ring zone 9a of the body mold 9, an optical element 1 with no eccentricity on the functional surface and whose central thickness is always constant.
0 can be formed.

しかし、この従来の成形用型では、第４図に示
すように押圧ロツド１５の押圧点が上型１２の押
圧点が上型１２の中心からずれていると押圧力は
傾斜輪帯９ａの一部で受けることになり、傾斜輪
帯９ａの他の部分では上型１２と接触しない状態
になつて、不均一成形品の光学素子となつて、品
質のバラツキがあつた。 However, in this conventional molding die, if the pressing point of the pressing rod 15 and the pressing point of the upper mold 12 are shifted from the center of the upper mold 12, as shown in FIG. The other parts of the inclined ring zone 9a were not in contact with the upper die 12, resulting in an unevenly molded optical element, resulting in variations in quality.

〔発明の目的〕[Purpose of the invention]

本発明の目的は、上記の欠点を除去し、簡単な
構造により、上型の押圧点が上型中心からずれて
いる場合にも、光学素子の機能面が偏心せず、し
かも中心厚が常に一定の光学素子を成形すること
が可能となる光学素子成形用型を提供することで
ある。 An object of the present invention is to eliminate the above-mentioned drawbacks, and to have a simple structure that prevents the functional surface of the optical element from being decentered even when the pressing point of the upper mold is shifted from the center of the upper mold, and moreover, the center thickness is always maintained. It is an object of the present invention to provide a mold for molding an optical element that can mold a certain optical element.

〔発明の概要〕[Summary of the invention]

本発明の光学素子成形用型は、上型、下型及び
胴型を組合わせて、光学素子を加圧成形するもの
で、前記上型の押圧面に押圧突起を設けたことを
特徴とするものである。 The mold for molding an optical element of the present invention is for pressure molding an optical element by combining an upper mold, a lower mold, and a body mold, and is characterized in that a pressing protrusion is provided on the pressing surface of the upper mold. It is something.

〔実施例〕〔Example〕

以下、図面を参照して本発明の好適な実施例に
ついて説明する。第５図は本発明の実施例で８は
成形用下型で、光学素子１０の第１機能面を形成
する成形面８ａが設けられている。成形面８ａは
成形される光学素子１０の形状によつて球面でも
非球面でもよい。胴型９は前記下型８に固定され
て、型の一部を構成する。胴型９は光学素子１０
の側面１０ａを形成する。下型８と胴型９は一体
でもよい。胴型９の上部には傾斜輪帯９ａが形成
されている。傾斜輪帯９ａは第１機能面８ａの光
軸O4を中心軸とするように形成されている。他
方、上型２０は光学素子１０の第２機能面を形成
する成形面２０ａを有している。上型２０の押圧
ロツド１４側の面（以下、押圧面）２０ｄには押
圧突起２０ｂが設けられていて、押圧ロツド１４
は押圧突起２０ｂを加圧するようになつている。
押圧突起２０ｂは、上型２０の光軸O5上に設け
られている。押圧ロツド１４の端部は平面に加工
してある。下型８、胴型９、上型２０で囲まれた
空隙に配置された光学素子素材は、成形に必要な
温度に加熱後、上型２０、押圧ロツド１４を介し
て油圧シリンダー（図示せず）又はエアシリンダ
ー（図示せず）によつて加圧成形される。押圧ロ
ツド１４は、上型２０に設けられた押圧突起２０
ｂと点２０ｃで接触する。この押圧突起２０ｂに
よつて押圧ロツド１４の位置が上型２０と距離ｅ
だけずれていたとしても常に上型２０の中心を加
圧することができる。 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 5 shows an embodiment of the present invention. Reference numeral 8 denotes a lower mold for molding, and a molding surface 8a forming the first functional surface of the optical element 10 is provided. The molding surface 8a may be spherical or aspheric depending on the shape of the optical element 10 to be molded. The body mold 9 is fixed to the lower mold 8 and constitutes a part of the mold. The body type 9 is an optical element 10
side surface 10a is formed. The lower mold 8 and the body mold 9 may be integrated. An inclined ring zone 9a is formed in the upper part of the body mold 9. The inclined annular zone 9a is formed so that the optical axis O4 of the first functional surface 8a is the central axis. On the other hand, the upper mold 20 has a molding surface 20a that forms the second functional surface of the optical element 10. A pressing protrusion 20b is provided on a surface 20d of the upper mold 20 on the pressing rod 14 side (hereinafter referred to as pressing surface).
is adapted to press the pressing protrusion 20b.
The pressing protrusion 20b is provided on the optical axis O5 of the upper mold 20. The end of the pressing rod 14 is machined into a flat surface. The optical element material placed in the gap surrounded by the lower mold 8, body mold 9, and upper mold 20 is heated to the temperature required for molding, and then passed through the upper mold 20 and the pressing rod 14 to a hydraulic cylinder (not shown). ) or an air cylinder (not shown). The pressing rod 14 is a pressing protrusion 20 provided on the upper die 20.
contact b at point 20c. Due to this pressing protrusion 20b, the position of the pressing rod 14 is set at a distance e from the upper die 20.
The center of the upper mold 20 can always be pressurized even if the upper mold 20 is deviated by a certain amount.

前記、実施例においては、上型２０の一面に押
圧突起２０ｂを設けた形状で説明したが、例えば
上型２０に圧縮強度の弱い材料を使用する時など
押圧突起２０ｂが加圧でつぶれることを防ぐた
め、上型２０に穴加工してそこに高強度の押圧部
材を埋め込んでもよい。また、上型２０に押圧突
起２０ｂを加工することが困難な場合は、第６図
に示すような押圧突起１３ａを有する部品１３を
上型１２に組み合わせて使用することもできる。 In the above-mentioned embodiment, the shape in which the pressing protrusion 20b is provided on one surface of the upper die 20 has been explained, but it is important to note that the pressing protrusion 20b may be crushed by pressure, for example, when the upper die 20 is made of a material with low compressive strength. To prevent this, a hole may be formed in the upper mold 20 and a high-strength pressing member may be embedded therein. Furthermore, if it is difficult to form the pressing projections 20b on the upper mold 20, a component 13 having pressing projections 13a as shown in FIG. 6 may be used in combination with the upper mold 12.

もちろん、この押圧突起２０ｂあるいは１３ａ
の形状は、半球に限定される、押圧ロツドと一点
で接触するような形状ならば、上記実施例に限定
されない。 Of course, this pressing protrusion 20b or 13a
The shape is not limited to the above embodiment as long as it is limited to a hemisphere and comes into contact with the pressing rod at one point.

〔発明の効果〕〔Effect of the invention〕

以上説明したように、本発明によれば、成形用
型の寸法精度、嵌合精度が広い許容値をもつよう
な場合でも、光学素子の機能面がその光軸から偏
心せず、しかも中心厚が一定で高品質な光学素子
を成形することのできる光学素子成形用型が得ら
れる。 As explained above, according to the present invention, even when the dimensional accuracy and fitting accuracy of the molding die have wide tolerances, the functional surface of the optical element will not be eccentric from its optical axis, and the center thickness can be maintained. A mold for molding an optical element that can mold a high-quality optical element with a constant value can be obtained.

【図面の簡単な説明】[Brief explanation of drawings]

第１図ａ，ｂは従来の成形用型の断面図、第２
図は従来型によつて得られた光学素子断面図、第
３図は従来の他の成形用型の断面図、第４図は第
３図の成形用型で押圧ロツドの位置がずれている
時の状態図、第５図は、本発明の光学素子成形用
型の一実施例を示す断面図、第６図は、本発明の
他の実施例を示す断面図である。 １…固定型、２…下型、３…ガラス塊、４…上
型、６…レンズ、８…下型、９…胴型、１０…光
学素子、１２…上型、１３…部品、１３ａ…押圧
突起、１４…押圧ロツド、１５…押圧ロツド、２
０…上型、２０ａ…成形面、２０ｂ…押圧突起、
２０ｃ…点、２０ｄ…押圧面。 Figures 1a and b are cross-sectional views of conventional molding molds;
The figure is a cross-sectional view of an optical element obtained by a conventional mold, Figure 3 is a cross-sectional view of another conventional mold, and Figure 4 is the mold shown in Figure 3, with the pressing rod shifted in position. FIG. 5 is a cross-sectional view showing one embodiment of the mold for molding an optical element of the present invention, and FIG. 6 is a cross-sectional view showing another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Fixed mold, 2... Lower mold, 3... Glass lump, 4... Upper mold, 6... Lens, 8... Lower mold, 9... Body mold, 10... Optical element, 12... Upper mold, 13... Component, 13a... Pressing protrusion, 14... Pressing rod, 15... Pressing rod, 2
0...upper mold, 20a...molding surface, 20b...pressing protrusion,
20c...point, 20d...pressing surface.

Claims (1)

【特許請求の範囲】[Claims] １ 上型、下型及び胴型を組合わせて、光学素子
を加圧成形する光学素子成形用型において、前記
上型の押圧面に押圧突起を設けたことを特徴とす
る光学素子成形用型。1. An optical element mold for press-molding an optical element by combining an upper mold, a lower mold, and a body mold, characterized in that a pressing protrusion is provided on the pressing surface of the upper mold. .
JP9573084A 1984-05-15 1984-05-15 Optical element mold Granted JPS60239332A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9573084A JPS60239332A (en) 1984-05-15 1984-05-15 Optical element mold

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9573084A JPS60239332A (en) 1984-05-15 1984-05-15 Optical element mold

Publications (2)

Publication Number Publication Date
JPS60239332A JPS60239332A (en) 1985-11-28
JPH0442338B2 true JPH0442338B2 (en) 1992-07-13

Family

ID=14145590

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9573084A Granted JPS60239332A (en) 1984-05-15 1984-05-15 Optical element mold

Country Status (1)

Country Link
JP (1) JPS60239332A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS616139A (en) * 1984-06-15 1986-01-11 Hoya Corp Process for press-molding lens having little shift of optical axis
JPS6488504A (en) * 1987-09-30 1989-04-03 Alps Electric Co Ltd Optical lens and its manufacture
JP2515905B2 (en) * 1990-03-14 1996-07-10 オリンパス光学工業株式会社 Mold driving device for glass lens molding machine

Also Published As

Publication number Publication date
JPS60239332A (en) 1985-11-28

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