JPH01135617A - Lens of vehicular lighting fixture - Google Patents

Abstract

PURPOSE:To make it possible to integrally mold a floating island-like lens part in a main lens part by a method wherein the floating island-like lens part is molded primarily by one set of slide cores, with which a cavity is formed for first shot, and after that, the floating island-like lens part is connected to a cavity for second shot by sliding the slide cores and, under the state just mentioned above, a main lens part is molded secondarily. CONSTITUTION:In the molding of the lens of a vehicular lighting fixture, firstly, a guide hole 3, which extends over molds A and B, is connected to and in one set of the molds A and B so as to slidingly house one set of slide cores (a) and (b) therein. A cavity 2a on the molds A and B side is separated from a cavity 1a under the state that the slide cores (a) and (b) are moved to the rising limit side so as to mold a primarily molded item 1, which serves as a floating island-like lens part, by pouring molten resin material from one injection mechanism. After that, the slide cores (a) and (b) are moved to the falling limit side so as to connect the primary molded item 1, which is molded in the cavity 1a, to the cavity 2a on the molds A and B side in order to mold a secondary molded item 2, which serves as a main lens part, by pouring molten resin material, which is different from that of the primarily molded item 1, from other injection mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a multicolor illumination lens, a lens with different performance, and other different types of lenses used in vehicle lamps such as front or rear combination lamps of automobiles.

[Conventional technology]

Lighting equipment for vehicles such as automobiles, especially so-called front or rear combination lamps, etc., uses multicolor lighting lenses that are integrally configured with multiple different color filter lenses, and so-called prism lenses that have a lens step formed on the rear surface of the required lenses. A multifunctional lens is used. As such multicolor lighting lenses and multifunctional lenses,
For example, as shown in FIG. 7, when a different color amber lens or the like is integrated into one side of the main lens portion 51 such as a rearance lens in a floating island shape, first the floating island lens portion 51
The main lens part 51 with a transparent attachment part 52 and the floating island lens part 50 can be molded separately, and in a later process they can be made into an integrated product by ultrasonic welding or the like, or as shown in FIG. First, a floating island-shaped lens portion that will become the primary molded product 50 is molded, and when molding the main lens that is the secondary molded product 51, this is inserted into a predetermined position in the molds A and B to form an integral part. It was manufactured using a molding method.

[Problem that the invention seeks to solve]

However, according to the above molding method, molding work is required for each different color or different type of lens. Therefore, not only is a dedicated mold for molding each lens required, but especially for the former, as a post-process. It is necessary to weld the floating island lens part 50 and the main lens part 51 around the entire circumference of their joining edges 50a and 51a, which not only requires extra effort and time, but also makes it impossible to perform the above work efficiently. In order to achieve this, it is necessary to mold the outer diameter of the floating island lens part 50 to be slightly smaller than the inner diameter of the main lens part 51. Therefore, a gap 53 is generated toward the surface side after the two are bonded, and the lens There is a problem that the sense of unity with the front surface side is lost, and mud and dust get in there and spoil the appearance.In addition, each lens part 50.
Not only does there exist a molded wall thickness α of 51, but also there is a non-step part β where no lens step can be formed during molding, so these parts α, β and one part of the interval between the gap 53 are There is a problem in that an invalid portion N that cannot be illuminated is formed, and this is visible from the front side, making the lens surface look bad.

In addition, in the latter method, when molding the secondary molded product 51, in order to prevent mold deviation of the primary molded product 50 that occurs when aligning the lands of the mold C on the mold B, the secondary molded product 51 is molded. The secondary molding side end of the molded product 50 must be held between the two molds B and C, and a clamping edge 50b is formed in advance at this portion, and the secondary molded product 50 and the secondary molded product 51 are joined together. A joining edge 50a for the purpose of forming a joint is molded on the end face of the primary molded product 50 continuously from the sandwiching edge 50b, and a joining edge 50a on the secondary molded product 51 side is joined to the joining edge 50a on the secondary molded product 50 side 8!5
It is necessary to form 1a. Moreover, the joining edge 50a of both
, 51a is formed with an interlocking part to obtain bonding strength between the two, and in order to absorb the protrusion length γ of the protrusion 52 protruding from the secondary molded product 50 side into the secondary molded product 51 side,
Therefore, it becomes necessary to increase the wall thickness α by that much. Therefore, it is not possible to form a lens step or the like on the rear surface of the joining edges 50a, 51a and the clamping edge 50b, which are the tight margins, and there is no step β on the side of the secondary molded product 51 formed for design purposes. In total, 2 (α+β)
This creates a wide invalid area N, which impairs the sense of unity between the primary molded product 50 and the secondary molded product 51 in terms of design, and also makes the invalid area N visible from the front side, which impairs the appearance of the lens toward the front side. damage, but the height δ of the joining edges 50a, 51a
However, in order to completely bond the two, a thickness several times the basic thickness of the lens is required, which poses a problem in that it interferes with the product configuration.

The present invention was devised in view of the above problem, and when integrally molding a multicolor illumination lens 0, a different functional lens having a different lens step shape, and other different types of lenses (hereinafter referred to as "different types of lenses"), The floating island-shaped lens part is molded into the main lens part by pre-casting, improving the appearance on the lens surface side, reducing the number of molds required for this, reducing the number of work hours, and making the molding work unmanned. The purpose of this research is to propose a vehicle lamp lens that can be automated.

[Means for solving problems]

Accordingly, the vehicle lamp lens according to the present invention includes pre-molding lenses that are slidably housed in a set of molds that form cavities for post-molding, respectively corresponding to the set of molds. After the floating island-shaped lens part is primarily molded using a set of slide inserts that form a cavity for molding, the slide insert is slid to connect the floating island-shaped lens part to the cavity for post-molding. This is constructed by injecting a resin different from the resin for primary molding into a cavity for post-molding to secondary mold the main lens portion.

[Effect]

According to the above configuration, when integrally molding different types of lenses, it is not only possible to integrally mold the floating island lens part, which is a primary molded product, within the main lens part, which is a secondary molded product, but also makes it possible to reduce the molding process. In order to reduce the number of man-hours and increase work efficiency, contribute to the reduction of molding and other expenses, and - to reduce the time interval between blow molding work and secondary molding work - the floating island-shaped lens is a secondary molded product. The precision of the joint between the lens part and the main lens part, which is a secondary molded product, is improved, and there is no need for a binding margin between the two parts, so a vehicle lamp lens with an excellent sense of unity can be obtained.

〔Example〕

Embodiments of the vehicle lamp lens according to the present invention will be described below with reference to the drawings.

Figures 1 and 2 show a method for molding a vehicle lamp lens in which a floating island-like lens part, which is a secondary molded product 1, is simultaneously integrated into a main lens part, which is a secondary molded product 2, and the molding used therein. This is to explain the structure of the mold for molding, and the cavity 1a is placed in a pair of molds A and B that form a cavity 2a for molding a main lens, which is a secondary molded product 2 by post-molding. A set of slides connecting guide holes 3 that are in contact with one side and spanning both molds A and B, and forming a cavity 1a for a floating island-shaped lens portion that is a primary molded product 1 within the guide holes 3. The inserts a and b are slidably accommodated.

That is, an example of the cavity 2a for the secondary molded product 2 is as follows:
It opens in contact with the inside of the guide hole 3, and the opening thereof is opened and closed by the sliding surface of the slide insert. Also, the above slide insert a.

b is a cylinder 4.5 opposed to each other on the sliding direction side.
The cylinders 4 and 5 slide by the driving force of the cylinders 4 and 5.
By selectively supplying hydraulic or pneumatic pressure to the piston rods 4a and 5a, the slide inserts a and b can be slid within the guide hole 3 between the upper and lower limits, respectively. It is designed to be possible. In addition, in this embodiment, the lower side of the slide insert is provided with a groove that is perpendicular to the sliding direction of the slide insert and slides toward the lower surface of the slide insert to engage with the slide insert in a draft shape. Kotter 6 is placed. This cockter 6 stops the movement of the slide insert in the lowering limit direction when injection pressure is applied inside the cavity la, and there are several sheets that engage with each other on each retaining surface where they come into contact. The slide insert is supported on the upper limit side with the two protrusions 7b in contact with each other, and the two protrusions 7a and 7b are formed. When a and 7b are engaged with each other, the slide insert can be allowed to move toward the lower limit side. Therefore, there is an effect that a large stroke of the slide inserts a, b can be tolerated with a small stroke of the comb, that is, a stroke corresponding to the thickness of the teeth or the unevenness 7a, 7b. Then, insert the slide inserts a and b into each cylinder 4.
, 5 in the upward limit direction (direction of arrow A),
When the slider 6 is moved in a predetermined direction (in the direction of the arrow) by the driving force of the cylinder 8, and the protrusions 7b are brought into contact with each other and the slide insert is locked at the upper limit side, the structure for the secondary molded product 2 is The cavity 2a formed by the molds A and B is closed by the sliding surface of the slide insert, and conversely, the Kotsukuro is moved in the opposite direction (in the direction of the convex arrow) to remove the uneven part? a
, 7b are moved in the lowering limit direction (two arrow directions), the slide insert a
, b form the cavity la side and the slide insert a,
The cavities 2a formed by the molds A and B that house the molds A and B can be continuous with each other.

FIG. 3 shows an example of a vehicle lamp lens according to the present invention, in which (A) is a non-step filter lens formed by simultaneous chemical molding, and (0) is a prism lens.

That is, the lamp lens for both vehicles first has a slide insert a,
Mold A with b moved to the upper limit side.

Cavity 2a is made independent from cavity 1a on the B side (
(See Figure 1), after injecting the molten resin material using the injection mechanism (-) to form the primary molded product 1 that will become the floating island lens part,
Slide inserts a and b are moved to the lower limit side, and the cavities 2a on the sides of molds A and B are connected to the primary molded product 1 molded in the cavity la (see Fig. 2), - the next molded product 1 The secondary molded product 2 that will become the main lens portion is formed by injecting a different resin melt material from the injection mechanism using another injection mechanism. Therefore, after molding the next molded product 1 side, mold A
There is no need to separate the molds A and B or use other molds;

Only by the sliding operation b, it is possible to simultaneously mold the secondary molded product 1 and the secondary molded product 2 which are integrally continuous, and the molding operation time can be significantly shortened. This shortened time also makes it possible to control the molding time from primary molding to secondary molding, and the injection of the molten resin material for secondary molded product 2 can be carried out for secondary molded product 2 before the next molded product 1 is solidified. Therefore, it is possible to improve the accuracy of the joint between the secondary molded product 1 and the secondary molded product 2. Therefore, there is no longer a need for the pinching edge or joining edge that serves as a binding margin between the primary molded product 1 and the secondary molded product 2, which have been necessary in the past (a), and different types of lenses can be directly integrally and simultaneously molded. In case,
This is because it is possible to minimize the rise δ of the bonding edge and eliminate the non-stepped portion on the lens surface side (0).

(c) The occurrence of the invalid portion N is reduced, and the appearance toward the lens surface side is improved.

FIG. 4(a) shows the floating island lens part 50 when blow molding, and FIG. 4(b) shows the vehicle lamp lens after secondary molding 51 of the main lens part continuous to the floating island lens part. Furthermore, FIGS. 5 and 6 show a joint part of a polychromatic illumination lens, the former of which is made by a conventional insert molding method;
The latter shows the junction X of the polychromatic illumination lens made of different lenses and moldable materials according to the present invention, and clearly shows the remarkable difference in accuracy between the two.

〔Effect of the invention〕

Since the vehicle lamp lens according to the present invention is constructed as described above, the floating island-like lens portion can be integrally molded within the main lens portion, and a pinching edge or a joining edge can be formed at the joining portion between different types of lenses. Multicolor lighting lenses for use in combination lamps, as there is no need for them, the appearance of the lens surface side is improved by minimizing the occurrence of invalid parts, and the number of molds required for molding can be significantly reduced. It contributes to reducing the price of other types of lenses, and it also makes molding work more efficient with automated and unmanned equipment.
It has excellent effects.

[Brief explanation of the drawing]

FIG. 1 shows a schematic configuration of a molding die according to the present invention, in which (A) is a front sectional view with the slide insert moved to the upper limit side, and (III) is a sectional view on the same side. , FIG. 2(A) is a front sectional view of the slide insert moved to the lower limit side, FIG. 2(II) is a sectional view of the same side, FIGS. 3(A) and (
0) is a cross-sectional perspective view of the main parts of the vehicle lamp lens according to the present invention molded by the above mold, (c) is an enlarged cross-sectional view of part ■ in (rl), and FIG. 4 (a) is a similarly primary molded product. Perspective view, (0) is a perspective view showing the primary molded product and secondary molded product that are also integrally molded, Figure 5 is an enlarged sectional view of the main part of the product molded by the conventional insert molding method, and Figure 6 is the main part of the product. A dissimilar lens according to the invention - an enlarged cross-sectional view of the main part of a product molded by chemical moldability, FIG. FIG. 8 is an explanatory diagram showing the same conventional molding method, and (rl) is an enlarged cross-sectional view of the ■ part in (a). A, B...Mold a, b...Slide insert 1
...-Secondary molded product 2...Secondary molded product l a--
-Cavity 2a...Cavity 3...Guide hole Patent applicant Koito Seisakusho Co., Ltd. Agent Patent attorney 1) Kazuo Figure 4 (A) l...-Next molded product 2...Secondary molding Item 1a...Cavity Figure 5 Figure 6

Claims (1)

[Claims] By a set of slide inserts forming cavities for pre-casting, each of which is slidably housed in a set of molds forming a cavity for post-casting, corresponding to the set of molds. After the floating island-shaped lens part is primarily molded, the slide insert is slid to connect the floating island-shaped lens part to the cavity for post-molding, and the primary molding resin and the resin for post-molding are placed in the cavity for post-molding. is a vehicle lighting lens made by injecting different resins and secondary molding the main lens part.