JPS62227730A - Press molder of lens - Google Patents

Press molder of lens

Info

Publication number
JPS62227730A
JPS62227730A JP7274586A JP7274586A JPS62227730A JP S62227730 A JPS62227730 A JP S62227730A JP 7274586 A JP7274586 A JP 7274586A JP 7274586 A JP7274586 A JP 7274586A JP S62227730 A JPS62227730 A JP S62227730A
Authority
JP
Japan
Prior art keywords
mold
lens
guide
molding
force
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.)
Granted
Application number
JP7274586A
Other languages
Japanese (ja)
Other versions
JPH0228460B2 (en
Inventor
Shinichiro Hirota
慎一郎 広田
Kishio Sugawara
菅原 紀士男
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.)
Hoya Corp
Original Assignee
Hoya Corp
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 Hoya Corp filed Critical Hoya Corp
Priority to JP7274586A priority Critical patent/JPH0228460B2/en
Publication of JPS62227730A publication Critical patent/JPS62227730A/en
Publication of JPH0228460B2 publication Critical patent/JPH0228460B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

PURPOSE:To make it possible to press an aspherical lens, for the surface profile, eccentricity, central thickness and outer diametral dimension of which super-high accuracies are required, with a simple mold assembly by a method wherein the lens is pressed in the state that the top surface, which is normal to the vertical center axis of a bottom force, of a guide force, is made to be flush with the top surface, which is normal to the vertical center axis of a top force, of the top force by means of the rear surface of a push plate. CONSTITUTION:A lens to be molded 1 is placed on the molding surface 2c of a bottom force 2 in the state that a top force 4 is drawn off from a guide force 3. Because the molding surface 2c is concave, the spherical lens to be molded 1 is positioned at the central part of the molding surface. If the lens to be molded is positioned at the center, its molding is done smoothly without entering of bubble in the lens and its accurate working can be realized. Next, the top force 4 is put in the guide force 3 and a push plate 5 is put on the top force 4. In the state as mentioned above, all the forces and the lens to be formed are heated in nitrogen gas atmosphere up to a temperature, at which the viscosity of the lens to be formed 1 turned to the 10<8>-10<10.5> poise so as to press-work the lens to be formed for 30sec by pushing down the push plate 5. By being pushed with the push plate 5, the top force 4 slides down in the guide force 3, thus pushing and extending the lens to be molded 1 outwards so as to mold the lens to be mold into a shape along the molding surface.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明はプレス成形にて光軸ずれの少ないレンズを製造
できるレンズのプレス成形装置に関するものである。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lens press molding apparatus that can manufacture lenses with little optical axis deviation by press molding.

〔従来技術〕[Prior art]

最近、ガラスを直接プレス加工することにより光学レン
ズを得ることが盛んに検討されている。
Recently, there has been much research into obtaining optical lenses by directly pressing glass.

従来このような加工を行なう装置として、例えば、特開
昭60−118640号公報に記載されたようなものが
ある。この成形装置は、側壁に取出口を設けたスリーブ
内に上型、下型を滑動自在に収納し、取出口を通してガ
ラスプリフォームを載せたリング状態型をスリーブ内に
挿入し、胴型内で上型と下型とによりプレス成形するも
のである。
As a conventional device for performing such processing, there is, for example, one described in Japanese Patent Application Laid-open No. 118640/1983. In this molding device, an upper mold and a lower mold are slidably housed in a sleeve with an outlet on the side wall, and a ring-shaped mold carrying a glass preform is inserted into the sleeve through the outlet, and the ring-shaped mold is inserted into the sleeve through the outlet. Press molding is performed using an upper die and a lower die.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

しかしながら、このような装置では、スリーブ内を上型
と下型が滑動するために4〜lOILmのクリアランス
が必要となり、このクリアランスのためにプレス時にス
リーブに対して上、下型が傾くという問題があった。光
軸の傾きに対して厳しい非球面のレンズの場合は、上、
下型及びスリーブの長さを非常に長くしてこの傾きを小
さくしなければならず、装置が大きくなってしまう。ま
た、この装置ではスリーブ内に挿入されたリング状態型
の中に上下から上型、下型を挿入させる構造にするため
に、ある程度のクリアランスがどうしても必要になり、
光軸の傾きを小さくしたり、光軸とレンズの外形に対す
る中心軸とを合致させたりすることが基本構造的に難し
い。
However, in such a device, a clearance of 4 to 1 OILm is required for the upper and lower dies to slide inside the sleeve, and this clearance causes the problem that the upper and lower dies tilt with respect to the sleeve during pressing. there were. In the case of an aspheric lens that is severely affected by the tilt of the optical axis,
The length of the lower die and the sleeve must be made very long to reduce this inclination, resulting in an increase in the size of the device. In addition, this device requires a certain amount of clearance because it has a structure in which the upper and lower molds are inserted from above and below into the ring-shaped mold inserted into the sleeve.
It is fundamentally structurally difficult to reduce the inclination of the optical axis or to make the optical axis coincide with the central axis of the outer shape of the lens.

一方、コンパクトディスクのピックアップ用のレンズと
して両面が非球面のものが開発されているが、このレン
ズは外形が5〜8mmと極めて小さく、面精度、偏心、
中心円Hのいずれも高精度が要求される0球面レンズの
場合は外形の中心軸に対する光軸のずれである偏心が問
題になるが、両弁球面レンズの場合は各面がそれぞれ中
心軸を持つために、中心軸同志の傾き(テイル) : 
T 1it)、中心軸同志の軸ずれ(ディセンタ:De
c e n t e r)が問題になる。コンパクトデ
ィスクのレンズで波面収差が0.04λrms(入は波
長)以内のものを得ようとすると、ティルトを60秒以
内、ディセンタを10gm以内に押える必要がある。ま
た、肉厚精度も±15ルm以内に押える必要がある。
On the other hand, a lens with aspherical surfaces on both sides has been developed as a pickup lens for compact discs, but this lens has an extremely small outer diameter of 5 to 8 mm, and its surface precision, eccentricity, and
In the case of a zero-spherical lens, which requires high accuracy for both central circles H, eccentricity, which is the deviation of the optical axis from the central axis of the outer shape, becomes a problem, but in the case of a double-valve spherical lens, each surface has its own center axis. To have, the tilt (tail) of the central axis:
T 1it), axis misalignment between center axes (decenter: De
cen ter) becomes a problem. In order to obtain a compact disk lens with wavefront aberration within 0.04λrms (input is wavelength), it is necessary to suppress tilt within 60 seconds and decenter within 10 gm. Also, the wall thickness accuracy must be kept within ±15 lumens.

しかしながら、このようなレンズを上記従来の装着で製
造することは困難であり、このようなレンズを簡単な構
造の装置で製造することが望まれていた。
However, it is difficult to manufacture such a lens using the conventional mounting described above, and it has been desired to manufacture such a lens using an apparatus having a simple structure.

〔問題点を解決するための手段〕[Means for solving problems]

上面に成形面が形成された下型と、下面に成形面が形成
され、その上面が垂直中心軸にほぼ直角な面に形成され
た上型と、下型の外周面に接触するとともに、下型の成
形面より上方に伸びて下型より高く形成された内周面を
有し、上型がこの内周面で滑動し得るように構成され、
かつその上面が下型の垂直中心軸にほぼ直角な面に形成
された案内型と、加圧前には−E型の上面に接触し加圧
時に案内型の上面に接触する押し板とを備えたものであ
る。
The lower mold has a molding surface formed on the upper surface, the upper mold has a molding surface formed on the lower surface, and the upper mold is formed into a surface substantially perpendicular to the vertical central axis, and the lower mold contacts the outer peripheral surface of the lower mold, and the lower mold has a molding surface formed on the lower surface. It has an inner circumferential surface that extends above the molding surface of the mold and is formed higher than the lower mold, and is configured such that the upper mold can slide on this inner peripheral surface,
and a guide mold whose upper surface is substantially perpendicular to the vertical center axis of the lower mold, and a push plate that contacts the upper surface of the -E mold before pressurizing and contacts the upper surface of the guide mold during pressurization. It is prepared.

また、案内型を上下に分割し、上案内型と上型を押し板
で上方から押すようにしたものである。
In addition, the guide mold is divided into upper and lower parts, and the upper guide mold and the upper mold are pushed from above by a push plate.

〔作 用〕[For production]

一ヒ型、下型の両成形面の間に被成形物を配置し、押し
板を介して上型を上方から加圧して案内型内に滑動させ
、押し板の下面が案内型の上面に当接するまでこの滑動
を続けることにより、また、上下の案内型が当接するま
で滑動することにより、被成形物をレンズに成形する。
The object to be formed is placed between the molding surfaces of the first mold and the lower mold, and the upper mold is pressed from above through the push plate to slide it into the guide mold, so that the lower surface of the push plate is on the upper surface of the guide mold. By continuing this sliding motion until they come into contact, and by sliding until the upper and lower guide molds come into contact with each other, the object to be molded is molded into a lens.

〔実施例〕〔Example〕

第1図(a)は被成形レンズ1をプレス加工する前の状
態の成形装置の断面図を示し、第1図(b)はプレス加
工後の断面図を示す、2は炭化タングステンからなる円
柱状の下型で、下部の径が大きくなってフランジ部2a
が形成され、この上面2bは下型2の外径に対する垂直
中心軸に直角な平滑面に精密に仕上られている。また、
下型2の上面は非球面の凹面からなる成形面2cに形成
されている。この成形面2cは非球面軸が垂直中心軸に
合致するように精度よく加工されている。3は同じく炭
化タングステンからなる下型2より高さが高い円筒形の
案内型であり、下型2にクリアランスO〜37zm程度
できつく嵌合され一体化されている。案内型3の上面3
aと下面3bは互いに平行な平滑面に精密に仕上られて
いる。従って、下型2の上面2bと案内型3の下面3b
が密接しているため、案内型3の上面3aは下型2の垂
直中心軸に直角に形成されることになる。なお、3c、
3dは案内型3の中央部に形成された空気抜用の孔であ
る。4は同じく炭化タングスタンからなる円柱形の上型
であり、上面4aは中心部に突起部4bが形成され、こ
の突起部4b以外の面は上型4の垂直中心軸に直角な平
滑面に精密に仕上られている。上型4の下面は非球面の
凸面からなる成形面4Cが形成されている。T#:、膨
面4Cは非球面軸が垂直中心軸に合致するように精度よ
く加工されている。この上型4は案内型3に対して滑動
可能な範囲でできるだけ小さいクリアランス。
FIG. 1(a) shows a cross-sectional view of the molding apparatus before pressing the lens 1 to be molded, and FIG. 1(b) shows a cross-sectional view after pressing. 2 is a circle made of tungsten carbide. It is a columnar lower mold with a larger diameter at the bottom and a flange part 2a.
is formed, and this upper surface 2b is precisely finished to be a smooth surface perpendicular to the vertical central axis with respect to the outer diameter of the lower mold 2. Also,
The upper surface of the lower mold 2 is formed into a molding surface 2c consisting of an aspherical concave surface. This molded surface 2c is precisely machined so that the aspherical axis coincides with the vertical central axis. Reference numeral 3 designates a cylindrical guide mold which is also made of tungsten carbide and is taller than the lower mold 2, and is tightly fitted and integrated with the lower mold 2 with a clearance of about 0 to 37 zm. Top surface 3 of guide mold 3
a and the lower surface 3b are precisely finished to be mutually parallel smooth surfaces. Therefore, the upper surface 2b of the lower mold 2 and the lower surface 3b of the guide mold 3
are in close contact with each other, the upper surface 3a of the guide mold 3 is formed perpendicular to the vertical center axis of the lower mold 2. Furthermore, 3c,
3d is an air vent hole formed in the center of the guide mold 3. 4 is a cylindrical upper mold also made of tungsten carbide, and the upper surface 4a has a protrusion 4b formed in the center, and the surfaces other than the protrusion 4b are precision-polished to a smooth surface perpendicular to the vertical center axis of the upper mold 4. It is finished. The lower surface of the upper mold 4 is formed with a molding surface 4C consisting of an aspherical convex surface. T#: The expanded surface 4C is precisely machined so that the aspherical axis coincides with the vertical central axis. This upper mold 4 has as small a clearance as possible within the range that it can slide relative to the guide mold 3.

例えば6gmのクリアランスで嵌合されるようになって
いる。5は同じく炭化タングステンからなる円盤形の押
し板であり、中心部には突起部4bがゆるく挿入される
穴5aが形成され、下面5bは平面度のよい平滑面に精
密に仕上られている。
For example, they are fitted with a clearance of 6gm. Reference numeral 5 designates a disc-shaped pushing plate made of tungsten carbide, with a hole 5a formed in the center into which a protrusion 4b is loosely inserted, and a lower surface 5b precisely finished to be a smooth surface with good flatness.

次に、この成形装置を使った成形方法を説明する。まず
、上型4を案内型3から抜いた状態で、光学ガラスの1
種類であるSF6 (転移温度435℃)の球状プリフ
ォーム(直径6 m m )の被成形レンズ1を下型2
の成形面zC上に置く、成形面2Cは凹面なので球形の
被成形レンズlは中央部に配置される。このように、被
成形レンズが中央部にあるとプレス成形時に押されて周
辺に広がるので、成形がスムースになされてレンズに気
泡が入らず精度よく加工できる0次に、上型4を案内型
3に入れ、上型4の上には押し板5を載せる。このとき
、被成形レンズ1の直径は最終レンズの中心肉厚より厚
いので、上型4は案内型3の上面3aより上方にグ出し
、押し板5の下面5bは上型4の上面4aに密接してい
るが案内型3の上面3aとは離れている。なお、押し板
5の穴5aに突起部4bが挿入されているのは、加圧時
に押し板5が上型4に対して横方向にずれないためであ
る。第1図(a)はこの状態を示している。
Next, a molding method using this molding device will be explained. First, with the upper mold 4 removed from the guide mold 3,
A lens 1 to be molded, which is a spherical preform (diameter 6 mm) of type SF6 (transition temperature 435°C), is placed in a lower mold 2.
Since the molding surface 2C is a concave surface, the spherical lens l to be molded is placed in the center. In this way, if the lens to be molded is located in the center, it will be pushed during press molding and spread to the periphery, so the molding will be smooth and there will be no air bubbles in the lens, making it possible to process the lens with high precision. 3, and a press plate 5 is placed on top of the upper mold 4. At this time, since the diameter of the lens 1 to be molded is thicker than the center thickness of the final lens, the upper mold 4 is pushed upward from the upper surface 3a of the guide mold 3, and the lower surface 5b of the pushing plate 5 is attached to the upper surface 4a of the upper mold 4. Although they are in close contact with each other, they are separated from the upper surface 3a of the guide mold 3. Note that the reason why the protrusion 4b is inserted into the hole 5a of the push plate 5 is to prevent the push plate 5 from shifting laterally with respect to the upper die 4 during pressurization. FIG. 1(a) shows this state.

この状態で、窒素ガス雰囲気中で昇温し、被成2   
 1G、( 形レンズlを10〜10ポアズの粘度にする0本実施例
では10ポアズの粘度にするために495°Cに昇温す
る。そして、押し板5を200kg/cm’に相当する
力で下方に押し、30秒間プレス加工を行なう、押し板
5に押されて上型4は案内型3内を滑動しながら下降し
、被成形レンズ1は押されて外方に延び成形面に沿った
形状に成形される。そして、押し板5の下面5bが案内
型3の上面3aに当接したとき上型4の下降は止る。こ
れによって、レンズの中心肉厚は精度よく決まる。すな
わち、後記するようにプレス後の冷却工程においては、
レンズ面に加わる荷重は上型4の自重(20g)のみで
あるため、これによってレンズが延びることは殆どない
からである。また、押し板5の室内型3に対するとう当
接により、上型4の上面4aと案内型3の上面3aとは
正確に同一平面を形成するため、下型2の非球面軸と上
型4の非球面軸との間の傾きを精度よく防止することが
できる。第1図(b)はこの状態を示している。
In this state, the temperature is raised in a nitrogen gas atmosphere, and the
1G, (to make the shaped lens l have a viscosity of 10 to 10 poise. In this example, the temperature is raised to 495°C to make it have a viscosity of 10 poise. Then, the push plate 5 is applied with a force equivalent to 200 kg/cm'. The upper die 4 is pushed downward by the push plate 5 and slides down inside the guide die 3, and the lens 1 to be molded is pushed and extends outward along the molding surface. Then, when the lower surface 5b of the push plate 5 comes into contact with the upper surface 3a of the guide mold 3, the upper mold 4 stops descending.Thereby, the center thickness of the lens is determined with high precision. As described later, in the cooling process after pressing,
This is because the only load applied to the lens surface is the weight (20 g) of the upper die 4, so that the lens hardly stretches due to this. Also, due to the forcible contact of the push plate 5 with the indoor mold 3, the upper surface 4a of the upper mold 4 and the upper surface 3a of the guide mold 3 form exactly the same plane, so that the aspherical axis of the lower mold 2 and the upper mold 4 It is possible to accurately prevent inclination between the aspherical axis and the aspherical axis. FIG. 1(b) shows this state.

また、押し板5が案内型3に当接したときの成形レンズ
1aの周辺部の状態を第2図に示す。レンズの周辺部1
aaと各型との間には隙間6が形成されている。型の寸
法は、被成形レンズ1の大きさが最大のものでもやや隙
間6ができるように設計されており、被成形レンズ1の
大きさのバラツキをこの隙間6で吸収するようにしてお
り、加圧中必ず押し板5が案内型3に当接するようにな
っている。
Further, FIG. 2 shows the state of the peripheral portion of the molded lens 1a when the push plate 5 comes into contact with the guide mold 3. Lens periphery 1
A gap 6 is formed between aa and each mold. The dimensions of the mold are designed so that there is a slight gap 6 even when the size of the lens 1 to be molded is the largest, and this gap 6 is used to absorb variations in the size of the lens 1 to be molded. The push plate 5 always comes into contact with the guide die 3 during pressurization.

さて、上述の30秒間のプレス加工を終了した後、その
ままガラス転移点(435℃)以下になるまで徐冷を行
なうこのとき、上型4は押し板5および案内型3に対し
て可動自在にした構造のため、冷却による成形レンズ1
aの収縮にともなって自重でこれに追従し、レンズの成
形面と接触を保っている。その結果、成形レンズ1aの
熱をその上、下面から上型4.下型2に均等に逃がすこ
とができる。
Now, after completing the above-mentioned 30 seconds of press working, the upper mold 4 is allowed to move freely relative to the push plate 5 and the guide mold 3. Because of the structure, molded lenses by cooling1
As a shrinks, it follows this shrinkage due to its own weight and maintains contact with the molding surface of the lens. As a result, the heat of the molded lens 1a is transferred from the upper and lower surfaces to the upper mold 4. It can be released evenly into the lower mold 2.

さらに冷却した後に、型を引くり返えし、押し板5の穴
5aを利用して型を突上げ、成形レンズlaを型から取
出す。
After further cooling, the mold is turned over, pushed up using the hole 5a of the push plate 5, and the molded lens la is taken out from the mold.

このようにして成形されたレンズは、高い面精度が得ら
れ、ティルトが20秒、ディセンタが5pmとなり、中
心肉厚精度がよく、波面収差が0.023人rmsのも
のが得られた。なお、比較のために上型4と押し板5が
一体の構造のもので同様のプレスを行なったが、冷却時
のレンズの収縮に上型4が追従しないため、高い面精度
のレンズが得られなかった。
The lens molded in this way had high surface accuracy, a tilt of 20 seconds, decentering of 5 pm, good center wall thickness accuracy, and a wavefront aberration of 0.023 human rms. For comparison, a similar press was carried out using a structure in which the upper mold 4 and the pressing plate 5 were integrated, but since the upper mold 4 did not follow the shrinkage of the lens during cooling, a lens with high surface precision could not be obtained. I couldn't.

第3図は他の実施例の断面図であり、(a)はプレス前
の状態、(b)はプレス後の状態を示す、第1図と同一
または相当部分には同一符号を付けである。下型2の下
面2haは垂直中心線に直角な平滑面に形成され、その
中心部の突起部2aaは案内型3の底面の中心穴3eに
挿入されている。
FIG. 3 is a sectional view of another embodiment, where (a) shows the state before pressing, and (b) shows the state after pressing. The same or equivalent parts as in FIG. 1 are given the same reference numerals. . The lower surface 2ha of the lower mold 2 is formed as a smooth surface perpendicular to the vertical center line, and the protrusion 2aa at the center thereof is inserted into the center hole 3e in the bottom surface of the guide mold 3.

案内型3の底部の上面3baと頭部の上面3aとは平行
に形成されおり、下型2の下面2baと案内型3の上面
3baは密接されているため、案内型3の上面3aは下
型2の垂直中心軸に直角に形成さることになる。また、
案内型3の上方の開口部は段3fがついてやや径が大き
く形成されており、これに合うように上型4は段4dが
ついて上方の径がやや大きく形成されている。3gは案
内型3に形成された空気抜用の孔である。上型4は第1
図に示した実施例と同様に小さいクリアランスで案内型
3に挿入される。
The upper surface 3ba of the bottom of the guide mold 3 and the upper surface 3a of the head are formed in parallel, and the lower surface 2ba of the lower mold 2 and the upper surface 3ba of the guide mold 3 are in close contact with each other, so that the upper surface 3a of the guide mold 3 is It is formed at right angles to the vertical central axis of mold 2. Also,
The upper opening of the guide mold 3 has a step 3f and is formed to have a slightly larger diameter, and to match this, the upper mold 4 has a step 4d and has a slightly larger diameter. 3g is an air vent hole formed in the guide mold 3. Upper mold 4 is the first
It is inserted into the guide mold 3 with a small clearance as in the embodiment shown in the figure.

第4図は他の実施例の断面図であり、(a)はプレス前
の状態、(b)はプレス後の状態をそれぞれ示す。また
、第5図は平面図、第6図は底面図である。
FIG. 4 is a sectional view of another embodiment, in which (a) shows the state before pressing, and (b) shows the state after pressing. Further, FIG. 5 is a plan view, and FIG. 6 is a bottom view.

下型12.下案内型13.上案内型23.上型14は前
の実施例と同様に炭化タングステンからなり、下型12
は下案内型13内に中心lOに対して120度毎に3個
設けられ、上型14は上案内型23内に中心IOに対し
て同じく120度毎に3個設けられている。3個の型と
も同じであるので以後1個についてだけ説明する。
Lower mold 12. Lower guide type 13. Upper guide type 23. The upper mold 14 is made of tungsten carbide as in the previous embodiment, and the lower mold 12
Three pieces of the upper mold 14 are provided in the lower guide mold 13 at every 120 degrees with respect to the center IO, and three pieces of the upper mold 14 are similarly provided in the upper guide mold 23 at every 120 degrees with respect to the center IO. Since all three types are the same, only one type will be explained below.

下型12.上型14の成形面12c、14cは球面に形
成され、球面の曲率半径の中心が型の外径の垂直中心軸
上にそれぞれ精度よく合致するように加工されている。
Lower mold 12. The molding surfaces 12c and 14c of the upper mold 14 are formed into spherical surfaces, and are machined so that the centers of the curvature radii of the spherical surfaces are precisely aligned with the vertical center axis of the outer diameter of the mold.

また、下型12の下面12ba、上型14の上面14a
はそれぞれ各垂直中心軸に直角に加工形成されている。
In addition, the lower surface 12ba of the lower mold 12 and the upper surface 14a of the upper mold 14
are formed perpendicularly to each vertical central axis.

下案内型13はその上、下面が平行平滑面に精度よく仕
上げられており、支持板8にネジ16により固定されて
いる。下案内型13より高さが低い下型12は、下案内
型13内に約3pLmのクリアランスで収納されている
。これにより、下案内型13の上面13aは、下型12
の垂直中・Q軸に直角に形成されることになる。また、
上案内型23はその上、下面が平行平滑面に精度よく仕
上げられており、ネジ17により平滑な下面9cを有す
る押し板9に固定されている。上型14はこの上案内型
23内に6gm程度のクリアランスで滑動自在に収納さ
れている。これにより、上案内型23の下面23bは、
上型14の垂直中心軸に直角に加工形成されることにな
る0段23f 、14dにより上案内型23と上型14
の間にはわずかな隙間が形成される。なお、13c、1
3d、23gは空気抜用の孔である。また、8a、9a
は通気用の穴である。9bは下案内型13内に固定され
た案内柱llを通るだめの穴である。23hは案内柱1
1を滑動自在に挿入するために上案内型23に形成され
た穴である。この3木の案内柱11に案内されて上案内
型23は滑動し、3組の上型14.下型12は精度よく
位置決めされる。そして、上案内型23と押し板9を案
内柱11からはずしても。
In addition, the lower guide mold 13 has a lower surface precisely finished to have a parallel smooth surface, and is fixed to the support plate 8 with screws 16. The lower mold 12, which is lower in height than the lower guide mold 13, is housed within the lower guide mold 13 with a clearance of about 3 pLm. As a result, the upper surface 13a of the lower guide mold 13
It will be formed perpendicular to the Q axis. Also,
In addition, the upper guide die 23 has a lower surface precisely finished to be parallel and smooth, and is fixed by screws 17 to the push plate 9 having a smooth lower surface 9c. The upper mold 14 is slidably housed in the upper guide mold 23 with a clearance of about 6 gm. As a result, the lower surface 23b of the upper guide mold 23 is
The upper guide mold 23 and the upper mold 14 are formed by the 0 steps 23f and 14d, which are formed perpendicularly to the vertical central axis of the upper mold 14.
A small gap is formed between them. In addition, 13c, 1
3d and 23g are air vent holes. Also, 8a, 9a
is a hole for ventilation. Reference numeral 9b is a hole through which a guide post ll fixed in the lower guide mold 13 passes. 23h is guide pillar 1
This is a hole formed in the upper guide mold 23 for slidably inserting the mold 1. The upper guide mold 23 slides guided by these three wooden guide posts 11, and the three sets of upper molds 14. The lower die 12 is positioned with high precision. Even if the upper guide mold 23 and push plate 9 are removed from the guide column 11.

3組の上型14は上案内型23に保持されている。Three sets of upper molds 14 are held by an upper guide mold 23.

前の実施例と同様に被成形レンズ1を下型12の上に載
せて第4図(a)の状態にする。次いで窒素ガス雰囲気
中で495℃に昇温し、200Kg/cmの圧力で押し
板9を押し30秒間プレス加工を行ない、上案内型23
を下案内型13に密接するまで下降させる。第4図(b
)はこの状態を示す。そして、転移温度(435℃)ま
で除冷し、さらに急冷してから成形レンズlaを型から
取出す。下型12と上型14の球面軸同志のティルトは
30秒以内に押えられ、ディセンタも7終m程度と極め
て小さく押えられる。また、冷却時のレンズの収縮に対
しては、段23f、14dの間の隙間のため上型14が
追従してレンズ面への接触を保つので、レンズの熱をそ
の上、下面から上、下型に均等に逃がしてレンズ面が高
精度に形成される。型からのレンズの取出しは、上案内
型23と押し板9を抜いた後、支持板8の穴8aを利用
して下型12を突上げて行なった。
As in the previous embodiment, the lens 1 to be molded is placed on the lower mold 12 to form the state shown in FIG. 4(a). Next, the temperature was raised to 495° C. in a nitrogen gas atmosphere, and pressing plate 9 was pressed at a pressure of 200 kg/cm for 30 seconds to press the upper guide mold 23.
is lowered until it comes into close contact with the lower guide mold 13. Figure 4 (b
) indicates this state. Then, the molded lens la is slowly cooled to a transition temperature (435° C.) and further rapidly cooled, and then the molded lens la is taken out from the mold. The tilt of the spherical axes of the lower mold 12 and the upper mold 14 can be suppressed within 30 seconds, and the decentering can also be suppressed to an extremely small value of about 7 meters. In addition, when the lens contracts during cooling, the upper die 14 follows and maintains contact with the lens surface due to the gap between the stages 23f and 14d, so that the heat of the lens is transferred from the bottom surface to the top. The lens surface is formed with high precision by discharging evenly into the lower mold. To take out the lens from the mold, after removing the upper guide mold 23 and the push plate 9, the lower mold 12 was pushed up using the hole 8a of the support plate 8.

なお、上、下型の高さ寸法精度にバラツキがある場合に
は、上型、下型のいずれか一方または両方の下面に平行
平面の円盤状のスペイサをはさんでレンズの中心肉厚を
調整するこができる。
In addition, if there are variations in the height dimensional accuracy of the upper and lower molds, insert a parallel flat disc-shaped spacer on the bottom surface of either or both of the upper mold or lower mold to adjust the center thickness of the lens. It can be adjusted.

この実施例のように、案内型を2つに分けた構造にする
と、被成形レンズの型への配置および成形レンズの型か
らの取出しが容易になる効果がある。
When the guide mold is divided into two parts as in this embodiment, it is effective to facilitate the placement of the lens to be molded in the mold and the easy removal of the molded lens from the mold.

この実施例では下案内型に案内柱を固定したが、上案内
型に固定して、下案内型に案内柱が挿入される穴を形成
することもできる。
In this embodiment, the guide post is fixed to the lower guide mold, but it is also possible to fix it to the upper guide mold and form a hole in the lower guide mold into which the guide post is inserted.

〔発明の効果〕〔Effect of the invention〕

以上述べたように、本発明に係るレンズのプレス成形装
置によれば、下型の垂直中心軸に直角な案内型の上面と
上型の垂直中心軸に直角な上型の上面とを押し板の下面
で同一平面に合致させてレンズをプレスすることにより
、レンズの各面の軸相互間のティルトやディセンタが小
さくなり、面精度もよくなる。特に、面精度、偏心、中
心肉厚及び外径精度に超高精度が要求される非球面レン
ズを簡単な構成の型装置でプレス加工することができる
As described above, according to the lens press molding apparatus according to the present invention, the upper surface of the guide mold perpendicular to the vertical central axis of the lower mold and the upper surface of the upper mold perpendicular to the vertical central axis of the upper mold are connected by the pressing plate. By pressing the lens so that the lower surface of the lens is flush with the same plane, the tilt and decentering between the axes of each surface of the lens are reduced, and the surface accuracy is improved. In particular, an aspherical lens that requires ultra-high accuracy in surface accuracy, eccentricity, center wall thickness, and outer diameter accuracy can be press-processed using a die device with a simple configuration.

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

第1図(a) 、(b)は本発明に係るレンズのプレス
成形装置の一実施例の断面図、第2図は第1図(b)の
部分拡大断面図、第3図(a)、(b)は他の実施例の
断面図、第4図(a) 、 (b)は別の他の実施例の
断面図、第5図は第4図の実施例の平面図、第6図は同
じく底面図である。 1・・・被成形レンズ、1 & * *・成形レンズ、
2φφ会下型、2c 、4c・・・成形面、3・・・案
内型、3a、4a−・・上面、4拳拳・上型、5・・・
押し板、5b・・・下面。
FIGS. 1(a) and (b) are cross-sectional views of an embodiment of a lens press molding apparatus according to the present invention, FIG. 2 is a partially enlarged cross-sectional view of FIG. 1(b), and FIG. 3(a). , (b) are sectional views of another embodiment, FIGS. 4(a) and 4(b) are sectional views of another embodiment, FIG. 5 is a plan view of the embodiment of FIG. The figure is also a bottom view. 1... Lens to be molded, 1 & * * Molded lens,
2φφ lower mold, 2c, 4c... molding surface, 3... guide mold, 3a, 4a-... upper surface, 4 fist/upper mold, 5...
Push plate, 5b...lower surface.

Claims (2)

【特許請求の範囲】[Claims] (1)上面に成形面が形成された下型と、 下面に成形面が形成され、その上面が垂直中心軸にほぼ
直角な面に形成された上型と、 下型の外周面に接触するとともに、下型の成形面より上
方に伸びて下型より高く形成された内周面を有し、上型
がこの内周面で滑動し得るように構成され、かつその上
面が下型の垂直中心軸にほぼ直角な面に形成された案内
型と、 加圧前には上型の上面に接触し加圧時に案内型の上面に
接触する押し板とを備え、 両成形面の間に被成形物を配置し、押し板を介して上型
を上方から加圧することにより被成形物をレンズに成形
するレンズのプレス成形装置。
(1) A lower mold with a molding surface formed on the upper surface, an upper mold with a molding surface formed on the lower surface, and the upper surface of which is formed into a surface almost perpendicular to the vertical central axis, and the outer peripheral surface of the lower mold contacts. It also has an inner circumferential surface that extends above the molding surface of the lower die and is formed higher than the lower die, and is configured such that the upper die can slide on this inner circumferential surface, and that the upper surface is perpendicular to the lower die. It is equipped with a guide mold formed on a surface almost perpendicular to the central axis, and a push plate that contacts the top surface of the upper mold before pressurizing and contacts the top surface of the guide mold during pressurization. A lens press molding device that positions the molded product and presses the upper die from above via a press plate to form the molded product into a lens.
(2)上面に成形面が形成された下型と、 この下型に接触するとともに、下型の成形面より上方に
伸びて下型より高く形成された内周面を有し、その上面
が下型の垂直中心軸にほぼ直角な面に形成された下案内
型と、 下面に成形面が形成され、上面が垂直中心軸にほぼ直角
な面に形成されるとともに、下案内型内に滑動し得るよ
うに構成された上型と、 下面と上面が平行に形成され、上型が内部で滑動し得る
ように構成された上案内型と、 下面が上型の上面と上案内型の上面に密接するように構
成された押し板と、 下型と上型の各垂直中心軸が合致するように下案内型に
対して上案内型を案内する案内手段とを備え、 両成形面の間に被成形物を配置し、押し板を介して上型
を上方から加圧することにより被成形物をレンズに成形
するレンズのプレス成形装置。
(2) A lower mold with a molding surface formed on the upper surface; and an inner circumferential surface that is in contact with the lower mold, extends upward from the molding surface of the lower mold, and is formed higher than the lower mold; The lower guide mold is formed on a surface almost perpendicular to the vertical central axis of the lower mold, the molding surface is formed on the lower surface, the upper surface is formed on a surface almost perpendicular to the vertical central axis, and the mold slides into the lower guide mold. an upper mold whose lower surface and upper surface are parallel to each other and which are constructed so that the upper mold can slide therein; and a lower surface whose lower surface is the upper surface of the upper mold and the upper surface of the upper guide mold. and a guide means for guiding the upper guide mold relative to the lower guide mold so that the vertical central axes of the lower mold and the upper mold coincide, and the molding surface is spaced between the molding surfaces. This is a lens press molding device that places the molded material on the holder and presses the upper mold from above through a press plate to form the molded material into a lens.
JP7274586A 1986-03-31 1986-03-31 RENZUNOPURESUSEIKEISOCHI Expired - Lifetime JPH0228460B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7274586A JPH0228460B2 (en) 1986-03-31 1986-03-31 RENZUNOPURESUSEIKEISOCHI

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7274586A JPH0228460B2 (en) 1986-03-31 1986-03-31 RENZUNOPURESUSEIKEISOCHI

Publications (2)

Publication Number Publication Date
JPS62227730A true JPS62227730A (en) 1987-10-06
JPH0228460B2 JPH0228460B2 (en) 1990-06-25

Family

ID=13498199

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7274586A Expired - Lifetime JPH0228460B2 (en) 1986-03-31 1986-03-31 RENZUNOPURESUSEIKEISOCHI

Country Status (1)

Country Link
JP (1) JPH0228460B2 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01226744A (en) * 1988-03-04 1989-09-11 Konica Corp Formation mold for glass optical element
JPH02137740A (en) * 1988-11-16 1990-05-28 Canon Inc Molding of optical element
US5630967A (en) * 1992-08-19 1997-05-20 Greshes; Martin Method and apparatus for making lenses
US5718850A (en) * 1994-11-01 1998-02-17 Matsushita Electric Industrial Co., Ltd. Method and device for manufacturing optical elements
US5965069A (en) * 1996-01-31 1999-10-12 Matsushita Electric Industrial Co., Ltd. Method for making optical preforms and optical elements by press
US6007746A (en) * 1996-11-11 1999-12-28 Matsushita Electric Industrial Co., Ltd. Method for manufacturing preforms used in molding optical elements and method for manufacturing and molding optical elements

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01226744A (en) * 1988-03-04 1989-09-11 Konica Corp Formation mold for glass optical element
JPH02137740A (en) * 1988-11-16 1990-05-28 Canon Inc Molding of optical element
US5630967A (en) * 1992-08-19 1997-05-20 Greshes; Martin Method and apparatus for making lenses
US5718850A (en) * 1994-11-01 1998-02-17 Matsushita Electric Industrial Co., Ltd. Method and device for manufacturing optical elements
US5965069A (en) * 1996-01-31 1999-10-12 Matsushita Electric Industrial Co., Ltd. Method for making optical preforms and optical elements by press
US6007746A (en) * 1996-11-11 1999-12-28 Matsushita Electric Industrial Co., Ltd. Method for manufacturing preforms used in molding optical elements and method for manufacturing and molding optical elements

Also Published As

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