JPH0286723U

JPH0286723U -

Info

Publication number: JPH0286723U
Application number: JP16633688U
Authority: JP
Priority date: 1988-12-23
Filing date: 1988-12-23
Publication date: 1990-07-10

Description

[Brief explanation of drawings]

第１図は、本考案の一実施例に係り射出成形金
型により成形された成形品の上面よりの平面図、
第２図は、第１図の側面よりの平面図、第３図は
、第２図に示すアンダーカツトプレートのアンダ
ーカツト部を拡大にて示した断面平面図、第４図
は、他の成形によるアンダーカツトプレートのア
ンダーカツト部を拡大にて示した断面図、第５図
は、本実施例に係る他の成形品の形状を示す上面
よりの平面図、第６図は、第５図の斜視図、第７
図は、本考案に用いる射出成形金型の側面よりの
断面図、第８図は、本考案により成形された成形
品の形状を示す側面よりの平面図、第９図は、従
来における射出成形金型による成形品の形状を示
す側面よりの平面図、第１０図ａは、従来の成形
品の面精度の写真図、第１０図ｂは、本考案によ
る成形品の面精度の写真図。１……スプール、２，２′……ランナ、３……
アンダーカツトプレート、４，４′……成形品（
レンズ）、５……パーテイングライン、６……ア
ンダカツト、７……射出成形金型、８……固定側
金型、９……可動側金型。 FIG. 1 is a top plan view of a molded product molded by an injection mold according to an embodiment of the present invention;
Fig. 2 is a plan view from the side of Fig. 1, Fig. 3 is a cross-sectional plan view showing an enlarged undercut portion of the undercut plate shown in Fig. 2, and Fig. 4 is a plan view of another molding. FIG. 5 is a top plan view showing the shape of another molded product according to this example, and FIG. 6 is a cross-sectional view showing the undercut part of the undercut plate according to Perspective view, 7th
The figure is a cross-sectional view from the side of the injection mold used in the present invention, Figure 8 is a plan view from the side showing the shape of the molded product molded by the present invention, and Figure 9 is a conventional injection molding. FIG. 10A is a photograph of the surface accuracy of a conventional molded product, and FIG. 10B is a photograph of the surface accuracy of a molded product according to the present invention. 1... Spool, 2, 2'... Runner, 3...
Undercut plate, 4, 4'... Molded product (
lens), 5...parting line, 6...undercut, 7...injection mold, 8...fixed side mold, 9...movable side mold.

Claims

[Scope of Claim for Utility Model Registration] (1) An injection mold for plastic molding lenses, characterized in that a plate having an undercut is provided at the periphery of a runner of a movable side mold. (2) The undercut provided on the above plate is
2. The injection mold according to claim 1, wherein the movable side mold has a pull-out resistance formed on the peripheral surface of the plate during mold release, such as by forming a V-shape, a reverse taper shape, or a grain pattern. (3) The injection mold according to item 1, wherein the plate is a circular plate having a diameter of 10 to 30 mm with the spool as the center. (4) The injection mold according to item 1, wherein the plate has an oval shape (oval shape) with the spool as the center.