JPH0766685B2 - Manufacturing method of compound lens - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a combined lens having a structure in which three lenses having three different color tones are lined up and at least three sides thereof are surrounded by a lens frame. It is about.

[Industrial application field]

This type of lens is used, for example, in a combination lamp for automobiles.

[Conventional technology]

In such a case, lenses of three types of color tones (for example, yellow, red, and white) are provided in a line, for example, for a direction indicator lamp, for a braking signal lamp, and for a license plate illumination.

FIG. 5 shows an example of this type of combined lens, where 1 is a yellow lens Y, 2 is a red lens R, and 3 is a white (colorless) lens W. Reference numeral 4 is a lens frame.

[Problems to be Solved by the Invention]

Conventionally, in order to manufacture such a lens, a yellow lens Y1 is injection-molded with a yellow transparent plastic material, a red lens R2 is injection-molded with a red transparent plastic material separately from the above operation, and further a colorless transparent The white lens W3 is injection-molded from the plastic material described above, and the three lenses thus separately molded are fitted into the lens frame 4 or the lens frame 4
The lens frame 4 was injection molded with a plastic material so as to surround the three lenses.

In the present invention, the lens frame refers to a member which does not have an optical function itself and is arranged on the entire circumference or a part of the circumference of the lens in order to mechanically support the lens.

The method of construction described above requires at least three molding dies and at least three injection molding operations.

Therefore, the cost for producing the mold is high, and in addition, the injection molding process is complicated and requires a lot of time and labor.

The present invention has been made in view of the above-mentioned circumstances, and two sets of combined lenses in which three lenses of three kinds of color tones (for example, color tone Y, color tone R, color tone W) are fitted in a frame are provided. Using the mold, 2
It is intended to provide a method that can be configured by one injection operation.

[Means for Solving the Problems]

The method according to the present invention created to achieve the above object is (a) for injection molding of two lenses arranged at both ends among three lenses of three kinds of color tones arranged side by side. (B) The two cavities corresponding to the above two lenses are connected by a molten plastic flow path, and (c) the color tone of each of the two lenses at both ends in the above mold. For example, two types of molten plastic materials corresponding to color tones Y and W are used to injection-mold two lenses at both ends in a single operation.

As a result, a two-lens connecting member, which is connected by the rod-shaped member solidified in the molten plastic channel of the item (b), is obtained as an intermediate product.

(D) An injection molding die having a cavity corresponding to the finished product is constructed, and the two-lens connecting member molded in the above item (c) is housed therein to correspond to the color tone of the central lens (for example, color tone R With the molten plastic material of 2), the central lens and lens frame are injection molded in the second operation, and the 2 lens connecting member, which is the intermediate product obtained in the step (c) above, is newly molded. The lens frame is heat-sealed to each other.

[Action]

According to the above-mentioned means, two sets of molds for injection molding (that is, one set of the lenses at both ends and the connecting rod-like member, and one set of the center lens and the lens frame) are sufficient. Moreover, the injection molding operation only needs to be performed twice.

〔Example〕

1 and 2 are process explanatory views in one embodiment of the method for manufacturing a combined lens according to the present invention.

FIG. 1 (A) shows that the first injection molding operation should be performed.
The outline of a lens connection member is shown. Therefore, this FIG. 1 (A) shows the shape of the cavity provided in the mold for the first injection molding.

Reference numeral 1'denotes a hollow portion corresponding to the yellow lens Y, 3'denotes a hollow portion corresponding to the colorless lens 3, and 5'and 6'represents a molten plastic flow path corresponding to a connecting rod portion.

Injection molding is carried out by injecting a yellow transparent molten plastic material into the cavity 1'and a colorless transparent molten plastic material into the cavity 3 '.

FIG. 1 (B) shows a two-lens connecting member formed by the first injection molding. For the sake of convenience of reading, the yellow part is hatched in a right-down direction. Is attached, and the colorless part is hatched in a right-down direction. Is attached.

In the connecting rod-shaped parts 5 and 6, molten plastic materials of both tones are mixed and solidified in the vicinity of the central part to form an unclear boundary (which means the boundary of the tones, no boundary is generated for the shape). is doing.

The CC cross section is shown in FIG. 1 (C), and the DD cross section is shown in FIG. 1 (D).

Reference numerals 3a and 3b appearing in FIG. 1 (D) are legs for attaching to a lamp housing (not shown).

A mold (not shown) for the second injection molding having a concave portion having the same shape as the contour of the combined lens finished product shown in FIG. 5 was constructed, and the mold shown in FIG. The lens connecting member is housed and red transparent molten plastic is injection-molded in the remaining space. The state in this step is shown in FIG.

The drawing reference numbers 1 (yellow lens), 3 (colorless lens), and 5 and 6 (connecting rod-shaped portions) shown in FIG. 2 are constituent parts of the two-lens connecting member shown in FIG. 1 (B). is there.

In FIG. 2, the part drawn with a broken line is a part molded with red molten plastic, and this red molten plastic is solidified to form the red lens 2 and the lens frame 4. The connecting rod-shaped portions 5 and 6 are fused to the lens frame 4 and serve as a lens leg and a reinforcing member.

In the combination lens (FIG. 2) of this embodiment, the red lens 2, the lens frame 4, the colorless lens 3, the yellow lens 1, and the connecting rods 5 and 6 which are the respective constituent parts are integrated with each other. Since it has been modified (meaning that the boundaries of material histology will disappear), it is stable in strength and highly reliable.

Moreover, since the lens frame 4 formed of a synthetic resin material having the same color tone as the red lens 2 covers the front surface of the portion functioning as the lens leg, the mounting structure portion of the combined lens does not appear in the appearance.

The III-III cross section of FIG. 2 is shown in FIG. 3, and the IV-IV cross section is also shown in FIG.

〔The invention's effect〕

As described above in detail, according to the method of the present invention, the three-color combined lens surrounded by the frame can be injection-molded by two operations using two sets of molds, and the mold cost can be reduced. This is a great contribution to saving and injection molding cost.

[Brief description of drawings]

1 and 2 are process explanatory diagrams in one embodiment of the method for manufacturing a combined lens according to the present invention. FIG. 3 is a sectional view taken along the line III-III in FIG. 2, and FIG.
It is an IV sectional view. FIG. 5 is a front view showing an example of a trichromatic combination lens. 1 ... Yellow lens Y, 2 ... Red lens R, 3 ... Colorless lens W, 3a, 3b ... Lens legs, 4 ... Lens frame, 5,
5 ', 6,6' ... Connecting rod.

Claims (1)

[Claims] 1. Three different kinds of color tones are designated as W, R, and Y, and a lens of color tone W and a lens of color tone Y are arranged on both sides of a lens of color tone R, and three kinds are arranged in a row as described above. In a method of manufacturing a combined lens in which a lens frame is provided around a lens having a color tone of (a), (a) a lens mold of a color tone W and a lens mold of a color tone Y are integrally configured, and both lenses are compatible. A molten synthetic resin flow channel connecting the concave portions is provided, and (b) the molten synthetic resin of the color tone W is injected into the lens mold of the color tone W, and the molten synthetic resin of the color tone Y is injected into the lens mold of the color tone Y. (C) A lens of color tone W and a lens of color tone Y are connected by a rod-shaped member formed in the above-mentioned molten synthetic resin flow path, and a two-lens connecting member which is an intermediate product is injection-molded. (D) The above-mentioned two-lens connecting member is replaced with the above-mentioned two types. It is put in a mold separate from the lens model of color tone, the molten resin of color tone R is injected, and the lens of color tone R and the lens frame of color tone R are integrally injection-molded. A method of manufacturing a combined lens, wherein the two-lens connecting member formed in the step and the lens frame having a color tone R formed in the step d are heat-sealed.