JPH044115A - Painting method of parts of lighting device made of synthetic resin for vehicle - Google Patents

Abstract

PURPOSE:To improve durability and weather resistance by preventing peeling by making an independent painting process unnecessary, by a method wherein a molten synthetic resin material is introduced between a picture pattern printed surface of a film and a molding surface of a molding tool and simultaneously with molding of parts of a lighting device a picture pattern is transferred to the surface of the parts of the lighting device. CONSTITUTION:Molds 20, 30, 40 are made into a broken state, a film 50 is sent into molding surface 22, 32 and a picture pattern is positioned. Then a movable platen 24 is approached to a stationary platen 44, the molds 20, 30, 40 are clamped, the film 50 is made into a clamped state at a fringe part of the molding surface and a nozzle 62 of a molten resin feeder 60 is pushed against a resin feed port 42. Then molten resin is cast into the resin feed port 42 through the nozzle 62. The cast molten resin is injected into a cavity formed of the molding surfaces 22, 32 by passing through passages 36, 46 and a gate 33. In this instance, the film 50 comes into contact with the molten resin injected within the cavity, pressed against the molding surface and becomes a stuck state. Then the picture pattern 52 is stuck to a resin surface, taken into the molten resin integrally, molded and formed into a part of the surface of the parts of the lighting device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for painting synthetic resin lamp parts for vehicles, which forms a predetermined pattern on the front or back surface of the synthetic resin lamp parts.

[Prior art]

A problem with vehicle lights is that light that enters the light from outside is reflected by the reflector and emitted forward through the front lens, causing the light to appear as if the light is turned on, so-called false lighting. . As a means to prevent this false lighting, it is sufficient to block the light that enters the lamp through the lens when it exits from the lens. A technique is known in which a linear light-shielding portion is formed in the area.

FIG. 5 shows a technique in which a striped light-shielding portion 4 is formed on the surface of the lens 2 by painting or printing, and the light-shielding portion 4 blocks external light that has entered the lamp.

FIG. 6 shows a technique disclosed in Japanese Patent Application Laid-Open No. 63-259901, in which a transparent part 4 having a light shielding part 4 whose density gradually increases toward the periphery is provided on the front side or the back side (the back side in the figure) of the front lens 2. By arranging the sheet 5, the light shielding portion 4 blocks external light that has entered the lamp.

[Problem to be solved by the invention]

However, in the first conventional technique described above, the light shielding part 4 is formed by painting or printing (printing on the surface of the lens product).
A step corresponding to the thickness of the light shielding part 4 is created in the light shielding part 12 .

For this reason, there were problems such as poor appearance, easy peeling, and poor durability and weather resistance.

Further, in the second conventional technique described above, since the transparent sheet 5 having the light shielding part 4 is interposed inside the lamp, the number of parts increases accordingly, the lamp structure becomes complicated, the thickness of the lamp increases, and the sheet There are various problems such as a decrease in the amount of light due to the transmission of light. Furthermore, the lenses of lamps have various three-dimensional shapes, and it is difficult and troublesome to print a predetermined pattern on a transparent sheet that corresponds to the three-dimensional curved shape.

Furthermore, the above-mentioned No. 1. In the second conventional technology, a process for forming a light-shielding part on the molded lens 2 or sheet 5 is essential, and two steps are required: a part molding process and a process of painting the light-shielding part on this part. there were.

The present invention has been made in view of the problems of the prior art,
The purpose is to provide a method for painting synthetic resin lamp parts for vehicles, which has a smooth pattern forming surface, excellent durability and weather resistance of the formed pattern, and which performs painting at the same time as molding the lamp part. .

[Means to solve the problem]

In order to achieve the above object, in the method for providing a synthetic resin lamp part for a vehicle according to claim (1), the lamp part is made of a synthetic resin material and an insoluble thermoplastic resin,
A flexible film with a predetermined pattern printed on its surface is extended along the molding surface of the mold, and a molten synthetic resin material is introduced between the pattern-printed surface of the film and the molding surface of the mold. , a picture pattern is transferred onto the surface of the lamp part at the same time as the lamp part is molded.

An example of a synthetic resin lamp component is a lens disposed in the front opening of the lamp body, and a light shielding part can be formed in the form of a picture pattern on the front or back surface of this lens.

[Effect]

Since the picture pattern is incorporated into the surface of the lamp part and is integrated flush with the surface of the lamp part, there is no fear of peeling and a smooth pattern-forming surface can be obtained. In addition, a picture pattern can be formed on the surface of the lamp parts at the same time as the molding of the lamp parts.
An independent painting process can be omitted.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

1 and 2 show a front lens made of synthetic resin, which is one of the components of an automotive lamp manufactured by the method according to the present invention, and FIG. 1 is a longitudinal cross-sectional view of the front lens; FIG. 2 shows an enlarged cross-sectional view of the main part, the light shielding part.

In these figures, reference numeral 1o denotes a front lens that is assembled into the front opening of a container-shaped lamp body (not shown), and has a concave surface formed on the opening side of the lamp body.

On the surface of the lens 10, light-shielding portions 12 (12a, 12b, . . . ), which are picture patterns transferred from the film 50 side to be described later, are formed simultaneously with the molding of the lens 1o. The light shielding part 12 has a horizontal striped pattern, and has a gradation pattern in which the width of the cotton gradually becomes wider toward the upper and lower edges of the lens, and the intervals between adjacent horizontal stripes become narrower.

In particular, the color of the light-shielding parts 12a, 12b, etc. is the same as that of the vehicle body, and therefore the lens 10 is close to the color of the vehicle body (not shown) at the upper and lower ends of the lamp, and is similar to the color of the lamp. The color grandeur creates a sense of unity between the car bodies.

Further, metal powder such as aluminum is mixed in the light shielding part 12 so that the light incident thereon is reflected. That is, the external light Ω that enters the lamp from the lens 10 is reflected by a mirror lid (not shown) in the lamp and becomes light Q2 directed toward the lens 10. When it is about to exit from the lens 10, this Light shielding parts 12a, 12b
Emission of light is prevented by the light shielding effect of .... Specifically, since light is reflected and scattered by the metal powder in the light shielding part 12, false lighting of the lamp is prevented.

Further, the light shielding part 12 is as shown in FIG.

It is taken into the lens lo and forms a part of the lens, and the light shielding part 12 and the non-light shielding part are flush with each other, and the lens 1
The front surface of 0 is a smooth surface.

Therefore, there is no fear that the light shielding part 12 will peel off, and the pattern is excellent in durability and weather resistance, and the air friction resistance when the vehicle is running is also small.

FIGS. 3(a) to 3(d) show a method of painting the lens surface simultaneously with lens molding.

In the figure, reference numeral 20.30 indicates the first molding surface 22.32 disposed with molding surfaces 22.32 facing each other. A second movable mold for molding, on the opposite side of the second mold 30 from the first mold 20, a third molding mold that is a fixed mold supported by a fixed platen 44. A mold 40 is placed. The first mold 20 is supported by the movable plate 24, the second mold 30 is supported by a slide mechanism (not shown) that slides in conjunction with the movable plate 24, and each
It is possible to move toward and away from the mold 40, and the mold clamping shown in FIG. 3(b) and the mold opening shown in FIG. 3(d) are performed.

Between the molding surfaces 22 and 32, a film 50 on which a picture pattern 52 is printed and forms a light-shielding portion 12 having a light-shielding effect is disposed in a hanging state. The film 50 is made of a thermoplastic resin material, which is the forming material of the lens 10, and an insoluble synthetic resin material, which is a thermoplastic resin that can be easily deformed by coming into contact with the molten resin molded in the mold. When the lens is molded, it comes into close contact with the molding surface, so that only the picture pattern 52 can be transferred to the lens side. The film 50 is also attached to a drum 5 disposed above between the molds 20 and 30.
By winding the coiled film 51 onto an empty drum 55 below, the film 50 can be supplied in accordance with the lens molding process.

The second mold 30 and the third mold 40 include a second mold 3
A resin passage 36° 46 is formed extending to the gate 33 of the third mold 40, and a nozzle 62 of a molten resin feeder 60 is located behind the fixed platen 44 facing the resin feed port 42 of the third mold 40. ing.

Next, a lens molding and painting process in which the present invention is applied to in-mold molding will be described with reference to FIGS. 3(a) to 3(d).

First, as shown in FIG. 3(a), the mold is 20°30.
40 in the open state, the film 50 is placed on the molding surface 22.
32 to position the picture pattern 52. Next, the movable platen 24 is brought close to the fixed platen 44, and as shown in FIG. 3(b)
As shown in FIG. 2, the molds 20, 30, and 40 are clamped, the film 50 is clamped at the peripheral edge of the molding surface, and the nozzle 62 of the molten resin feeder 60 is pressed against the resin feed port 42.

Note that the drums 54 and 55 for winding the film 50 are supported by a support frame 56 of the movable platen 24, and the drums 54 and 55 for winding the film 50 are
Since o also slides together with the mold 20, the arrangement of the film 50 with respect to the molding surface 22 does not change. Next, as shown in FIG. 3(c), the resin supply port 4 is opened from the nozzle 62.
Inject the molten resin into 2. The injected molten resin is passed through passage 3.
6,46. Via the gate 33 it is injected into the cavity formed by the molding surface 22.32. At this time, the film 50 comes into contact with the molten resin injected into the cavity, becomes expandable and contractible due to the heat of the molten resin, is stretched by the injection pressure, and is pressed against the molding surface 22 to become in close contact. Then, the picture pattern 52 adheres to the resin surface under the action of a predetermined pressure and a predetermined temperature, is incorporated into the molten resin, and is molded to form a part of the surface of the lamp component. The situation at this time is shown in FIG. 3(c). After a predetermined cooling time, as shown in Figure 3 (
When the mold is opened and the molded product is taken out together with the spool 16 as shown in d), a lens 10 (see FIG. 1) having a picture pattern 52 integrally formed on its surface is obtained. Furthermore, picture pattern 5
2 is a light shielding portion 12 forming a part of the surface of the lens 10;
(12a, 12b...).

Figures 4(,) to (d) show a lens molding process in which the present invention is applied to thermojet molding, and the first difference from the method shown in Figures 3(,) to (d) is is mold 2
A heater 2 is installed near the film 5o introduced between 0 and 30 minutes.
6 is provided, and the film 50 is heated in advance by this heater 26, that is, in a state where it is easily deformed, and then the mold 20,
We are trying to send them every 30 days.

The second difference is that holes 28 are provided in the first mold 20, and a negative pressure generator (not shown) is used to clamp the mold (Fig. 4 (b).
)), the film 50 is brought into close contact with the molding surface 22 by applying negative pressure inside the cavity.

Further, the other structures in the molding device are the same as those shown in FIG. 3 described above, and the explanation thereof will be omitted by giving the same reference numerals.

FIG. 4(a) shows the process of opening the mold and positioning the pattern 52 on the film 50, and FIG. 4(b) shows the process of closing the mold, where the cavity position is filled with molten resin. Negative pressure is applied first. FIG. 4(c) shows the injection molding process, in which negative pressure is also acting. Figure 4 (cl.
) shows the process of opening the mold and taking out the molded product.

In this way, in the molding and painting method shown in FIGS. 4(,) to (d), the film 50 inside the cavity is warmed and becomes expandable and contractible even before it comes into contact with the molten resin, and furthermore, inside the cavity, Since the film 50 is brought into close contact with the molding surface 22 by negative pressure, it is possible to mold and paint a lens with a deeply uneven surface and a complicated shape, compared to the molding and painting method shown in FIG. 3 described above. Furthermore, the method shown in FIG. 4 has the advantage that it can also be used with a film that is somewhat less flexible than the film used in the method shown in FIG.

In addition, in the above embodiment, the lens 1 is used as an example of the lamp component.
Although the object on which the picture pattern 52 is formed is not limited to a lens, it may be a lamp body, a rim, or other synthetic resin lamp parts. Further, although the picture pattern 52 has been described as functioning as the light shielding portion 12, it may be a decorative picture pattern that does not have a light shielding effect.

〔Effect of the invention〕

As is clear from the above explanation, according to the method for painting synthetic resin lamp parts for vehicles according to the present invention, a picture pattern can be formed on the surface of the lamp part at the same time as the lamp part is molded, so an independent painting process can be performed. This can be omitted, there is no risk of peeling, and the number of manufacturing steps for patterned lamp parts that are excellent in durability and weather resistance can be shortened.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a lens manufactured by the method of the present invention, FIG. 2 is an enlarged sectional view of the main part of the same lens, and FIG. 3(a)
-(d) are explanatory diagrams for explaining one embodiment of the method for molding and painting lenses, FIGS. 4(a) to (d) are diagrams for explaining other embodiments of the method for molding and painting lenses, and FIG. and FIG. 6 are longitudinal sectional views of the prior art. 10...Lens, which is a synthetic resin lamp part, 12 (
12a, 12b-) - Light shielding part, 20.30・
...Mold which is a mold, 22.32...Molding surface, 5o...Film, 52...Picture pattern which is a transfer member. Figure Figure 3 (0) - (C) Figure 3 (d)

Claims (2)

[Claims] (1) A flexible film made of a synthetic resin material and an insoluble thermoplastic resin, which are materials for lamp parts, and which has a predetermined picture pattern printed on its surface, is stretched along the molding surface of a mold, and the film is A synthetic resin lamp part for a vehicle, characterized in that a molten synthetic resin material is introduced between the pattern-printed surface of the mold and the molding surface of the mold to transfer the pattern onto the surface of the lamp part at the same time as the lamp part is molded. Painting method. (2) Claim (1) characterized in that the lamp component is a lens disposed in a front opening of the lamp body, and the picture pattern is a light shielding part that prevents the emission of external light that has entered the lamp.
) Method for painting synthetic resin vehicle lighting parts.