JPH0442174B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to high-precision centering of a resin lens mold.

Structure of conventional example and its problems As shown in Fig. 1 and Fig. 2, the conventional resin lens mold device has lens insert 1 on attached plate 1 on the fixed side.
1, the bolt 18 is fixed and the jap is stable, but the outer diameter of the lens insert on the movable side and the lens insert sliding hole on the movable side mold plate have a gap to facilitate sliding when the molded product is ejected. , when molding a resin lens, as shown in Figure 2, the gap is shifted in one direction as shown in a and b, and the center of the lens surface of the fixed lens insert 11 and the center of the lens surface of the movable lens insert 12 are This has the disadvantage that misalignment occurs and the lens accuracy is significantly reduced.

OBJECTS OF THE INVENTION In view of the above-mentioned drawbacks, the present invention provides a mold device that prevents misalignment of lens inserts on the fixed side and movable side during resin lens molding, and molds resin lenses with high precision.

Structure of the Invention The present invention is designed to equalize the misalignment between the fixed and movable lens inserts in the circumferential direction, especially the gap between the movable lens insert and the lens insert sliding hole of the movable mold plate 3. The outer diameter of the side lens insert that fits into the tapered part on the bottom surface is made up of a centering block that fits snugly into the lens insert sliding hole of the movable side mold plate. It has the unique effect of equalizing the gap with the sliding hole of the movable template lens insert and maintaining concentricity.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 shows a resin lens mold apparatus according to the first embodiment of the present invention. In Figure 3, 1 is the mounting plate on the fixed side, 2 is the template on the fixed side, and 3
4 is a template on the movable side that fits into the centering block 16 of the movable lens insert and slidably holds the lens insert 12; 4 is a receiving plate that receives the molding pressure applied to the lens insert; 11 is a fixed mounting plate; Lens inserts 14 and 15 bolted to and held by the fixed template 2 are movable lens inserts 12.
The ejector rod and tightening bolt connect the ejector plate (not shown) to the ejector plate (not shown).

As described above, according to this embodiment, the movable template 3
Lens insert sliding hole and lens insert 1
The gears a and b shown in Fig. 2 are fitted into the lens insert sliding holes of the movable mold plate 3 with a tight fit, and are concentrically fitted with the tapered part c on the bottom of the lens insert. The concentricity of the lens inserts on the fixed side and the movable side can be maintained, and a highly accurate molded resin lens can be obtained.

FIG. 4 shows an embodiment in which a convex centering block is used for the tapered portion c, in contrast to the concave centering block shown in FIG.

Effects of the Invention As described above, by providing a centering block with a tapered spigot on the bottom of the lens insert, the fixed side lens surface and the movable side lens surface can be made concentric, which has a great practical effect. There is something.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a conventional resin lens molding device.
Fig. 2 is a sectional view of the lens insert in the assembled state, Fig. 3 is a sectional view of the resin lens mold resin in the first embodiment of the present invention, and Fig. 4 is the resin lens mold in the second embodiment. FIG. 3 is a partial cross-sectional view of the device. 6, 7, 8... Ejector plate, 9...
Movable side mounting plate, 5...Spacer block, 17
...Spacer block, 16...Return pin, 10...Sprue bush.

Claims (1)

[Claims] 1. A first lens insert set on a fixed side mounting plate, a fixed side part whose main parts are a fixed side template that holds this first lens insert, and a lens insert hole part of the side template that can be slid. a second lens insert; a centering block fixed to the movable template and having a centering portion on the second lens insert side capable of centering the second lens insert;
A resin lens mold device equipped with a movable side part whose main parts are a receiving plate that receives injection pressure and fixes a centering block, an ejector pin connected to a second lens insert, and an ejector plate and a mounting plate.