KR102343356B1 - Jig for making dome type silicone lens - Google Patents

Abstract

It has an upper male jig and a lower female jig, a container-shaped concave portion on a corresponding surface of the female jig, and a protrusion on a corresponding surface of the male jig, and the concave portion of the female jig forms a concave surface for a lens, The protrusion forms the convex surface for the lens, and in a state where the protrusion is inserted into the concave part, the distance at each position of the lens concave surface and the lens convex surface is at each position of the domed lens to be formed by the male jig and the female jig. In the domed silicon lens forming jig which is made to follow the thickness distribution of a predetermined lens, the entrance of the concave surface for the lens is formed with a sharp mountain, and the outer periphery of the mountain is formed lower than the corresponding surface of the female jig. Disclosed is a domed silicone lens forming jig, characterized in that the step is positioned and the protrusion is made to be in close contact with the corresponding surface of the male jig in a state in which the protrusion is inserted into the concave portion. The concave surface and the convex surface for the lens may be formed so that the extension of the dome-shaped lens to be formed has an inclination of about 1 degree outward. According to the present invention, when forming a silicon dome-type lens, it is possible to easily remove and process burrs due to materials overflowing from a jig or a female container, and suppress the occurrence of air bubbles to suppress the occurrence of lens defects due to air bubbles. can

Description

Dome-shaped silicone lens forming jig

The present invention relates to a silicon lens forming jig, and more particularly, to a domed silicon lens forming jig capable of suppressing the generation of air bubbles in a silicone lens manufacturing process.

Optical lenses are mainly formed of a material that is transparent and transmits light, and glass material was mainly used. Silicon (silicone) is also formed transparently, and is widely used as a window or lens in optical or lighting equipment.

Lenses using glass are often made by heating a mold with a certain curved surface, pouring liquid glass into it, hardening it, separating the original glass lens from the mold, and then smoothing the surface.

On the other hand, in the case of forming the lens with synthetic resin such as silicone, it is not suitable to precisely refine the curved surface of the lens through a separate grinding process after hardening like glass. use a lot According to this process, since there is no separate precise polishing operation other than using a mold, it is possible to form a lens quickly and at low cost, but it has some limitations in making a precise lens.

Therefore, synthetic resin lenses are often used for lenses that are used for general purposes at low cost rather than precision optical lenses.

Among the lenses, the dome-shaped lens is manufactured in a container-type shape with an approximately hemispherical or hemispherical extension to one side in a cylindrical shape, and the thickness of the dome-type window that acts as a kind of window while covering the lighting or optical equipment protruding from a certain case Like a lens, it is formed to gradually increase or decrease along the curvature of the lens as it goes from the center to the end, or to play a role of scattering.

Such a dome-type lens is usually made by injecting a liquid silicone resin into a female mold having a predetermined curved surface, inserting a male mold having a different predetermined curved surface to harden the resin filled in the gap between the two molds, and then releasing it from the mold surface. As for the method, a synthetic resin lens has an advantage compared to a glass lens. Since synthetic resins often have their own elasticity, they have many advantages even when releasing them from the mold surface.

On the other hand, although there is a slight difference, Korean Patent No. 10-0870065 mentions the usefulness of the dome-type lens. Herein, the intensity of light for each direction of the LED package without a conventional lens is disclosed. It can be seen that the light emitted through the LED package to which the lens is not mounted has a constant beam angle and is condensed.

In this case, in the LED package, a lot of total reflection of light occurs at the interface between the upper surface of the material molded with the LED and the air, so that a lot of light returns to the inside of the LED package, so there is a problem of low luminous efficiency.

In order for the LED package to have a better effect as a light source, the directional pattern of the light emitted from the LED package should be spread out widely like a fan. Orientation characteristics can be accessed through appropriate package design. Accordingly, it is disclosed that the dome lens is mounted on the LED package in order to increase the light efficiency.

If the dome lens is applied to the LED package, the directional pattern of the light emitted from the LED may appear wider than the case without the dome lens.

However, when making a lens, air bubbles or foreign substances in the lens can significantly deteriorate the lens function, so it must be actively excluded in the lens manufacturing process. Bubbles in the lens may be included in the process of making the lens material in liquid form, or may occur in the process of pouring and hardening the liquid material into a mold or jig.

Therefore, it is very important to prevent the formation of air bubbles in the liquid material and to form the mold or the forming jig so that air bubbles are not easily generated in the process of making the domed lens together with the technology of removing the generated air bubbles.

In addition, when making a lens using a resin and a mold, it is also important to easily form a smooth product without burrs by treating the resin overflowing from the mold during the manufacturing process.

Korean Patent Laid-Open Patent No. 10-1998-0048294 (1998.09.15) Republic of Korea Patent Registration No. 10-0870065 (2008.11.17)

The present invention is to solve the problem of the existing forming jig when forming the above-mentioned conventional domed silicon lens, and it is easy to remove and process the burr overflowing from the container in manufacturing the domed silicon lens using the forming jig An object of the present invention is to provide a domed silicone lens forming jig.

An object of the present invention is to provide a domed silicone lens forming jig having a configuration capable of suppressing the generation of air bubbles in manufacturing a domed silicone lens using the forming jig.

In the domed silicone lens forming jig of the present invention for achieving the above object, the interval between the female jig having the concave surface for the lens and the concave surface for the lens of the female jig when insertion into the female jig is completed has a thickness distribution of the lens A domed silicone lens forming jig having a male jig having a convex surface for a lens, wherein at least one concave surface for the lens is formed on a corresponding surface of the female jig, and an inlet of the concave surface is formed with a sharp mountain, A step portion for burr treatment is positioned around the periphery, and the male jig has at least one convex surface formed on a corresponding surface thereof.

In the present invention, an alignment groove or an alignment hole and an alignment protrusion corresponding thereto are installed on the corresponding surface of the female jig and the corresponding surface of the male jig to be closely coupled to each other, so that the concave surface for the lens and the convex surface for the lens are flat These alignment grooves or alignment holes and alignment protrusions can be formed to fit each other only when aligned in position.

In the present invention, the domed silicon lens may have a lens forming part that forms a curve in a vertical cross section passing through the center, and an extension part that forms a straight line, and the extension part forming a straight line has a specific fine inclination angle selected from 0.5 degrees to 1.5 degrees from vertical to the outside. degree, preferably one having an inclination of 1 degree.

In the present invention, the inlet end of the dome-shaped silicone lens may have a thin wall thickness to generate a step on the outer wall, and the step may be 1/2 of the wall thickness.

In the present invention, when the female jig is placed with the corresponding plane facing up and the male jig is installed with the corresponding plane facing down, a handle for facilitating installation or movement may be formed on the surface opposite to the corresponding plane of the male jig.

According to the present invention, it is possible to facilitate the removal and treatment of burrs caused by materials overflowing from a jig or a female container when forming a silicon dome-type lens.

According to the present invention, it is possible to suppress the occurrence of bubbles in the production of the silicon dome-type lens, thereby suppressing the occurrence of lens defects due to the bubbles.

1A and 1B are plan views of an upper jig and a lower jig of the present invention forming jig;
Figures 2a and 2b is a perspective view viewed from the upper side with respect to the upper jig and the lower jig of the forming jig;
3 is a perspective view showing an upper jig and a lower jig before combining in a state aligned with each other;
Figure 4 is one side cross-sectional view showing the upper jig and the lower jig before coupling in a state of being aligned with each other;
5 is a side cross-sectional view showing an upper jig and a lower jig in a state in which they are aligned with each other;
6 is a side cross-sectional view of a domed lens manufactured by the forming jig of the present invention;
7 is a perspective view illustrating a state in which the dome-shaped lens shown in FIG. 6 is combined with the device case.

Hereinafter, the present invention will be described in more detail through specific examples with reference to the drawings.

1 to 5, the dome-shaped silicon lens forming jig of this embodiment is made by providing an upper male jig 10 and a lower female jig 20 having a substantially rectangular parallelepiped block shape. The corresponding surface 29 or upper surface of the female jig 20 has a concave portion 21 that is a concave portion in the form of a container. The male jig 10 has a protrusion 11 inserted against the female jig on a mating surface 19 or a lower surface thereof.

If the surface of the concave portion 21 for lens formation on the corresponding surface 29 of the female jig is called the concave surface for lenses, and the surface of the projection 11 on the corresponding surface 19 of the male jig is called the convex surface for lenses, , the gap at each position between the lens concave surface of the female jig and the lens convex surface of the male jig in the state in which the projection 11 is inserted into the concave portion 21 is the angle of the domed lens to be formed by these jigs. It will be equal to the thickness at the location, and this thickness will follow the pre-calculated thickness distribution of the lens.

In this embodiment, four concave portions 21 and four protrusions 11 are formed, respectively, and thus, four domed lenses can be produced one at a time. It can be appropriately set according to the size of the lens and dome type.

On the other hand, in the corresponding surface 29 of the female jig, the entrance of the concave surface for the lens is formed with a sharp mountain 23 at the top, and a mountain ( 23) is in close contact with the corresponding face 19 of the male jig at the position where the male jig 10 is completely coupled to the female jig 20, and in this part 23, the gap between the male jig and the female jig is made to be almost non-existent.

The sharp peak 23 means that it is manufactured to have an acute angle of 30 degrees or less with the inner wall surface of the concave portion.

However, until the male jig 10 moves relatively to the female jig 20 and the mountain 23 finally touches the corresponding surface 19 of the male projection, there is a gap between the mountain and the male projection. When the liquid silicone resin flows out and the liquid silicone resin hardens in a solid state, the silicone resin flows into the part and the step part existing in the gap between the concave part 21 and the protrusion part 11 to form a dome-shaped lens. There is a part that overflows and hardens, but there is almost no silicone resin in the upper part of the acid 23 .

Therefore, ideally, when lifting the upper jig 10 and detaching the domed silicone lens from the lower jig 20, the silicon part of the step part 25 and the silicon part constituting the domed lens can be completely separated by the acid part. In addition, since silicon is distributed very thinly in the mountain part even if it is not completely separated, this part is easily broken by an external force without a separate tool, so that the silicon part of the step part and the silicon part constituting the dome-type lens can be easily separated.

On the other hand, in this embodiment, the alignment hole 13 or the alignment groove and the alignment hole 13 so that the corner portion of the corresponding surface 29 of the female jig 20 and the edge portion of the corresponding surface 19 of the male jig can be closely coupled to each other. An alignment protrusion 27 that can be inserted correspondingly is installed. Therefore, only when the concave surface and the convex surface for the lens are aligned in the correct position when viewed from above, the alignment holes 13 and the alignment protrusions 27 are positioned so that they are fitted and matched with each other, whereby the concave portion 21 of the lower jig ) and the thickness distribution of the dome-shaped lens formed between the protrusion 11 of the upper jig can be made accurately without being biased toward either side.

On the other hand, the domed silicon lens 30 manufactured according to this embodiment is divided into a lens forming part 31 forming a curved line and an extension part 33 forming a straight line when viewed in a vertical cross section passing through the center as shown in FIG. 6 . can When viewed three-dimensionally, the lens forming part 31 is close to a hemisphere, and the extended part 33 forming a straight line is almost cylindrical or close to a cylinder. However, here, the extended portion 33 forming a straight line has an inclination of 1 degree outward from the vertical.

Accordingly, the cylinder formed by the extension portion 33 has a slight taper or inclination. The inclination is preferably 1 degree as a fine inclination angle selected from the range of 0.5 degrees to 1.5 degrees. If this inclination is too large, coupling may become difficult when the cylinder part is coupled to another case or the like. In addition, when the dome-shaped silicone lens 30 is manufactured, the bubbles generated inside the liquid silicone between the male and female jigs can be naturally discharged along the overflowing liquid silicone.

In order to form such an inclination, the surface of the corresponding part of the cylinder of the upper jig 10 and the lower jig 20 also has a shape that is slightly spread outward. That is, from the bottom side of the concave portion to the inlet side of the concave surface, the area of the cross-section of the concave portion gradually increases, but the increasing rate or increase width gradually decreases.

Therefore, the degassed liquid resin is gradually poured into the concave portion 21 of the lower jig, and in that state, when the protrusion 11 of the upper jig is inserted, the lower end of the protrusion enters the liquid resin, and the liquid resin The surface rises gradually, but there is a slight inclination in this process, so the air and residual resin in the concave portion 21 can be well discharged through the gap between the secured protrusion and the concave portion and through the inlet of the concave portion. If the lenticular concave surface is a simple vertical inclination when the resin surface rises, it becomes difficult to secure a space to move and the gap between the protrusion and the concave portion as the resin below rises within the concave portion. There is an increased risk of air bubbles due to partial vortices and mixing due to abnormal flow of air.

In addition, if the upper cylinder of the concave portion is a simple vertical inclination, there may be a partially reverse inclined portion, and the problem that air is not exhausted well from this portion and this portion is trapped in the resin as the surface of the resin rises and becomes air bubbles. can be suppressed

Except in this case, even when some bubbles are generated due to the flow of resin when the protrusion is inserted, the bubbles are usually located on the surface of the resin, and the bubbles on the surface are discharged together when some of the resin flows over the acid to the step part. Air bubbles may be discharged from the part.

In addition, the inlet end of the dome-shaped silicone lens formed by this embodiment can be made such that the wall thickness is reduced so that a step 35 is generated on the outer wall as shown in FIG. 6 , and the step is 1/2 of that when the wall thickness is 1 mm It may be about 0.5 mm.

This step can make it easier to insert into the inner diameter of the entrance of the case 40 when the domed silicone lens 30 is coupled to close the entrance to the entrance of another case, as shown in FIG. 7 , and once some section In this inserted state, the outer surface of the domed silicone lens 30 and the outer surface of the case 40 may serve to be smoothly connected without any particular step.

On the other hand, in this embodiment, the lower jig is fixedly installed at the lower side, and when the protrusion is inserted into the concave portion, it may be installed in a separate facility so that the upper jig moves downward. This facility can be moved up and down, and it is desirable to be able to automatically adjust through plane movement so that the alignment protrusion of the lower jig can be accurately entered into the alignment hole of the upper jig on the front and rear left and right planes. A sensor can be used to indicate

In addition, in the present embodiment, the upper surface opposite to the corresponding surface 19 of the male jig 10 is formed with a handle 15 that facilitates installation or movement in the facility of the male jig located at the upper portion. This handle is coupled to the cuboid block of the male jig by means of a bolt (17).

In the above, the present invention has been described through limited examples, but these are only illustratively described to help the understanding of the present invention, and the present invention is not limited to these specific examples.

Accordingly, those of ordinary skill in the art to which the present invention pertains will be able to make various changes or application examples based on the present invention, and it is natural that such modifications or application examples belong to the appended claims.

10: male jig 11: projection
13: alignment hole 15: handle
17: bolt means 19: mating surface of the male jig
20: female jig 21: recess
23: mountain 25: step part
27: alignment protrusion 29: corresponding surface of the female jig
30: domed silicone lens 31: lens forming part
33: extension 35: step
40: case

Claims (5)

It has an upper male jig and a lower female jig,
A corresponding surface of the female jig has a container-shaped concave portion, and the male jig has a protrusion inserted into the concave portion on the corresponding surface of the male jig,
The concave portion of the female jig constitutes a concave surface for the lens, and the protrusion of the male jig forms a convex surface for the lens,
In a state in which the protrusion is inserted into the concave portion, the distance at each position of the concave surface for the lens and the convex surface for the lens is the thickness at each position of the domed lens to be formed by the male jig and the female jig and In the dome-shaped silicon lens forming jig made to follow the thickness distribution of a predetermined lens,
The entrance of the concave surface for the lens of the female jig is formed with a sharp mountain, and a step portion formed lower than the corresponding surface of the female jig is located on the outer periphery of the mountain, and the mountain is Made to be in close contact with the corresponding surface of the male jig,
The concave surface for the lens has a lens forming part that forms a curve when viewed in a vertical section and an extension part that forms a straight line, wherein the extension part forming the straight line has an inclination of 1 degree outward from the vertical. Domed silicone lens forming jig. The method of claim 1,
An alignment groove or an alignment hole and an alignment protrusion corresponding thereto are installed on the corresponding surface of the female jig and the corresponding surface of the male jig,
The domed silicone lens forming jig, characterized in that only when the concave surface for the lens and the convex surface for the lens are aligned in a regular position on a plane, the alignment groove or the alignment hole is matched by the alignment projections being fitted with each other. delete The method of claim 1,
A domed silicon lens forming jig, characterized in that the concave surface for the lens of the concave portion is formed so that the wall thickness of the inlet end of the domed silicon lens becomes thinner than other portions to form a step on the outer wall. The method of claim 1,
In the male jig, a domed silicone lens forming jig, characterized in that a handle for easy installation or movement is formed on a surface opposite to the corresponding surface of the male jig.

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