JP2019177575A5

JP2019177575A5 -

Info

Publication number: JP2019177575A5
Application number: JP2018068103A
Authority: JP
Filing date: 2018-03-30
Publication date: 2021-05-13

Description

本発明は、プラスチックレンズを成形するレンズ成形用金型において、前記プラスチックレンズの一方側の面および側面を成形する第１コアと、前記プラスチックレンズの他方側の面を成形する第２コアと、を備え、前記第１コアは、第１入れ子と外周が略円柱状の第２入れ子とを備え、前記第２入れ子は、前記第１入れ子に形成された円筒状の貫通孔に焼きばめによって固定されており、前記貫通孔から突出した前記第２入れ子の先端部が一方側のレンズ面を成形する一方側レンズ成形部であり、前記第１入れ子の前記第２コアとのパーティングラインである面に、前記第２コアに向かって凸のインロー凸部または前記第１コア側に凹のインロー凹部のいずれか一方が形成されており、前記第２コアには、前記第１入れ子に形成された前記インロー凸部または前記インロー凹部にインロー構造により嵌まり込むインロー凸部またはインロー凹部のいずれか他方が形成されている。このような構造を採用することで、インロー構造による位置決めが可能となり、成形精度の安定性を実現できる。また、構成部品点数を削減することができ、部品積上げによる累積誤差を抑制できる。また、焼きばめを採用する際に、第２コア入れ子の形状を略円柱形状とし、貫通孔の形状を円筒状とすることで、円柱、円筒研磨が可能になり部品精度出しが容易になる。また、焼きばめにより、調芯不要となるため、調芯時の金型修正を削減できる。すなわち、リードタイム短縮、コスト低減を実現できる。 In the lens molding mold for molding a plastic lens, the present invention includes a first core for molding one side surface and a side surface of the plastic lens, and a second core for molding the other side surface of the plastic lens. The first core includes a first nest and a second nest having a substantially columnar outer circumference, and the second nest is formed by shrink fitting into a cylindrical through hole formed in the first nest. The tip of the second nest that is fixed and protrudes from the through hole is a one-sided lens molding portion that forms the lens surface on one side, and is a parting line of the first nest with the second core. Either an in-row convex portion convex toward the second core or a concave in-row concave portion on the first core side is formed on a certain surface, and the second core is formed in the first nest. Either the in-row convex portion or the in-row concave portion that is fitted into the in-row convex portion or the in-row concave portion by the in-row structure is formed. By adopting such a structure, positioning by an in-row structure becomes possible, and stability of molding accuracy can be realized. In addition, the number of component parts can be reduced, and the cumulative error due to the stacking of parts can be suppressed. Further, when the shrink fit is adopted, the shape of the second core nest is made substantially cylindrical, and the shape of the through hole is made cylindrical, so that cylindrical and cylindrical polishing becomes possible and it becomes easy to improve the accuracy of parts. .. In addition, since shrink fitting eliminates the need for centering, it is possible to reduce mold modification during centering. That is, the lead time can be shortened and the cost can be reduced.

レンズ成形部１２１は平面部１２２の中央から垂直に延出している。レンズ成形部１２１の先端部には凸面からなる第２成形面１２７が形成されている。第２成形面１２７は、例えば、アモルファスＮｉ−Ｐメッキにより鏡面加工されている。 The lens molding portion 121 extends vertically from the center of the flat surface portion 122. A second molding surface 127 made of a convex surface is formed at the tip of the lens molding portion 121. The second molding surface 127 is mirror-finished by, for example, amorphous Ni-P plating.

レンズ成形部２２１は平面部２２２の中央から垂直に延出している。レンズ成形部２２１の先端部には凸面からなる第２成形面２２７が形成されている。第２成形面２２７は、例えば、アモルファスＮｉ−Ｐメッキにより鏡面加工されている。 The lens forming portion 221 extends vertically from the center of the flat portion 222. A second molding surface 227 made of a convex surface is formed at the tip of the lens molding portion 221. The second molding surface 227 is mirror-finished by, for example, amorphous Ni-P plating.

また、可動側コア２００と可動側型板９１５との隙間は３μｍ以下である。また、固定側コア１００と固定側型板９１３との隙間は１０μｍ以下である。可動側コア２００における焼きばめの固定構造とインロー構造により、成形時に発生するガスを逃がす経路として、焼きばめの構造が設けられていない固定側コア１００と固定側型板９１３との隙間を利用することができる。
Further, the gap between the movable side core 200 and the movable side template 915 is 3 μm or less. Further, the gap between the fixed side core 100 and the fixed side template 913 is 10 μm or less. Due to the fixed structure and inlay structure of the shrink fit in the movable core 200, the gap between the fixed core 100 and the fixed side template 913, which is not provided with the shrink fit structure, is provided as a path for releasing the gas generated during molding. It can be used.

Claims

In lens molding molds for molding plastic lenses
A first core that forms one side and a side surface of the plastic lens,
A second core, which forms the other side surface of the plastic lens, is provided.
The first core includes a first nest and a second nest having a substantially columnar outer circumference.
The second nest is fixed to a cylindrical through hole formed in the first nest by shrink fitting, and the tip of the second nest protruding from the through hole forms a lens surface on one side. It is a one-sided lens molding part
On the surface of the first nest that is a parting line with the second core, either an in-row convex portion that is convex toward the second core or an in-row concave portion that is concave toward the first core side is formed. Nesting
The second core is characterized in that either the in-row convex portion formed in the first nest or the in-row convex portion or the in-row concave portion that is fitted into the in-row concave portion by an in-row structure is formed. Mold for lens molding.