WO2018190467A1 - Micro-lens manufacturing method and micro-lens manufactured thereby - Google Patents

Abstract

The present invention relates to a micro-lens manufacturing method and a micro-lens manufactured thereby and, more specifically, to: a micro-lens manufacturing method that can fix a micro-lens array, which has a micro-lens layer formed to protrude therefrom, on a substrate by means of an adhesive layer and then vertically cuts the micro-lens array toward an optical axis, thereby maximizing the manufacturing efficiency of a micro-lens, enhancing assembling reliability of the micro-lens, and minimizing the occurrence of a product defect; and a micro-lens manufactured by the manufacturing method.

Description

Manufacturing method of micro lens and micro lens manufactured by the manufacturing method

The present invention relates to a method for manufacturing a microlens and a microlens manufactured by the method, wherein the microlens array is formed by fixing a microlens array on which a microlens layer protrudes onto a substrate by an adhesive layer and then vertically cutting the optical lens in a direction of an optical axis. The present invention relates to a method for manufacturing a microlens capable of maximizing a manufacturing efficiency of the microlens, improving assembly reliability of the microlens, and minimizing defects in a product, and a microlens manufactured by the manufacturing method.

Optical lenses are an important component of next-generation optical systems such as optical communication, optical information storage, sensors, and displays.

In the optical communication field, it has been applied to a multi-channel transmission / reception module that influences high-capacity optical efficiency and is used as a core component of high-capacity, efficiency and multi-channelization.

In addition, in the optical communication field, the demand for microglass lenses having a size of tens to hundreds of micrometers is rapidly increasing.

In addition, the optical information storage device may be applied to an optical recording information field such as CD and DVD which is responsible for data recording, and may be applied to high efficiency optical / image sensor applications by improving light sensitivity in the sensor area.

In addition, the display area may be applied to the backlight spherical component and the laser projection unit together with the polygon mirror to be used as an image realization component field.

1 is a view for explaining a mold for manufacturing a conventional micro lens.

Referring to FIG. 1, a mold 10 for manufacturing a conventional micro lens has a concave or concave groove portion 11a having a spherical or aspherical surface formed on a lower surface thereof, and having an upper mold 11 and a base which are movable in a vertical direction. It is provided on the member 12 and the upper surface of the base member 12, the upper surface comprises a lower mold 13 formed with a recessed groove portion 13a of a rectangular shape, the concave of the lower mold 13 After the lens raw material is disposed inside the groove 13a, the upper mold 11 is pressed to manufacture a micro lens.

However, since the mold 10 for manufacturing a conventional micro lens has to produce micro lenses individually, there is a problem in that production efficiency of the product is lowered when mass producing the lens.

In addition, the microlens 10α manufactured by the mold 10 for manufacturing a conventional microlens has a problem that the surface of the side surfaces 10α-1 is smooth, so that the adhesive force is reduced when installed on the optical component.

In addition, since the microlenses 10α manufactured by the mold 10 for manufacturing the conventional microlenses are manufactured in a mold manner, the edges of the microlenses 10α are manufactured in a rounded shape, so that the laser diode 30 and When attached on the optical component 20 while being spaced a predetermined distance, there is a problem that the mounting area is limited and the assembly reliability is low.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to use a microlens array to vertically cut neighboring lens layers in the optical axis direction, thereby improving the microlens manufacturing efficiency. It is to provide a manufacturing method.

In addition, another object of the present invention is that as the microlens array is cut, the surface roughness of the cutting surface (position to be interviewed at the installation position) is rough, thereby increasing the adhesive force on the optical component, and the entire surface of one side of the microlens as the cutting surface. The area is attached to the upper surface of the optical component, to provide a method for manufacturing a micro lens that can improve the assembly reliability of the micro lens.

The objects of the present invention are not limited to the above-mentioned objects, and other objects that are not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, the present invention provides a micro lens array preparing step of preparing a micro lens array protruding a plurality of micro lens layer spaced apart from each other by a predetermined interval; An adhesive layer applying step of applying an adhesive layer on the plate-shaped substrate; The microlens array is placed on top of the adhesive layer and the adhesive layer is cured to fix the microlens array on the substrate, wherein the adhesive layer fixes the microlens array to seal a space between the substrate and the microlens array. step; A microlens array cutting step of cutting in the optical axis direction at a position between the neighboring microlens layers; An adhesive layer removing step of removing the adhesive layer; And a microlens obtaining step of obtaining a microlens from which the adhesive layer has been removed. The microlens array includes an upper surface protruding microlens array having the microlens layers formed on an upper surface thereof, or an upper surface and a lower surface of the microlens array. The micro lens layers are formed, wherein the first micro lens layers formed on the upper surface and the second micro lens layers formed on the lower surface are double-sided protruding micro lens arrays formed at positions opposite to each other on the optical axis. It provides a method of manufacturing.

In a preferred embodiment, the first micro lens layer and the second micro lens layer are spherical or aspheric.

In a preferred embodiment, the preparing of the micro lens array may include a mold preparing step of preparing a first mold having a plurality of grooves formed at different positions on one side thereof in a plate shape, and a second mold having one side flat in the shape of a plate; Positioning a lens raw material between one side of the first mold and one side of the second mold; Pressing the first mold and the second mold; Obtaining a micro lens array having a micro lens layer formed on an upper surface thereof.

In a preferred embodiment, the preparing of the micro lens array may include a first mold having a plurality of first grooves formed at different positions on one side thereof in a plate shape, and a plate shape corresponding to the first mold. A mold preparation step of preparing a second mold having a plurality of second grooves corresponding to the grooves of the first mold; Positioning a lens raw material between one side of the first mold and one side of the second mold; Pressing the first mold and the second mold; And obtaining a microlens array having a first microlens layer and a second microlens layer respectively formed on upper and lower surfaces thereof.

In a preferred embodiment, the first groove portion and the second groove portion are spherical or aspheric.

In a preferred embodiment, the adhesive layer is an oil wax, an aqueous wax or a UV curable resin.

In a preferred embodiment, when the adhesive layer is an oily wax, the adhesive layer removing step may be performed by immersing the microlens array attached to the substrate in ethanol or oil to remove the oily wax.

In a preferred embodiment, when the adhesive layer is an aqueous wax, the adhesive layer removing step is to immerse the micro lens array adhered to the substrate in distilled water, so that the oily wax is removed.

In a preferred embodiment, when the adhesive layer is a UV curable resin, the adhesive layer removing step is to immerse the microlens array attached to the substrate in acetone, so that the oily wax is removed.

In a preferred embodiment, the preparing of the microlens array may include forming an antireflective coating layer on at least one of upper and lower surfaces of the microlens array obtained after obtaining the microlens array. It further includes;

In addition, the present invention is manufactured by a method for manufacturing a micro lens according to the present invention, a rectangular parallelepiped body portion; It further provides a micro lens comprising a; a micro lens layer of spherical or aspherical shape integrally extending on the upper surface or the lower surface of the body portion.

In addition, the present invention is manufactured by a method for manufacturing a micro lens according to the present invention, a rectangular parallelepiped body portion; A first micro lens layer integrally formed on an upper surface of the body portion and having a spherical or aspherical surface shape; And a second micro lens layer integrally formed on the bottom surface of the body portion and having a spherical or aspherical surface shape.

The present invention has the following excellent effects.

First, according to the manufacturing method of the microlenses of the present invention, by using a top surface or a double-sided protruding microlens array, by vertically cutting between adjacent lens layers in the optical axis direction, it is possible to easily produce a plurality of microlenses. There is

In addition, according to the manufacturing method of the microlens of the present invention, as the front surface or the front surface of one side of the double-sided protruding microlens array is stably bonded to the substrate by the adhesive layer, vertical cutting is easily performed in the optical axis direction. It has the advantage of minimizing the occurrence of product defects.

Further, according to the manufacturing method of the microlens of the present invention, as the microlens array is cut, the surface roughness of the cut surface (the position interviewed with the installation position) is rough, so that the adhesive force is increased on the optical component, and the cut lens is the microlens. Since the entire area of one side of the is attached to the upper surface of the optical component, there is an effect that can improve the assembly reliability of the micro lens.

Furthermore, according to the manufacturing method of the microlens of the present invention, since the cutting position can be easily changed, there is an effect of freely changing the outer size and shape of the microlens.

1 is a view for explaining a mold for manufacturing a conventional micro lens.

Figure 2 is a step for explaining a method of manufacturing a top surface protruding micro lens according to an embodiment of the present invention.

3 is a step for explaining a method of manufacturing a double-sided protrusion micro lens according to an embodiment of the present invention.

Figure 4 is a step for explaining the step of preparing a top surface protruding micro lens array according to an embodiment of the present invention.

5 is a step diagram for explaining a step of preparing a double-sided protrusion type micro lens array according to an embodiment of the present invention.

110: Micro Lens Array

111: first micro lens layer

112: second micro lens layer

120: substrate

130: adhesive layer

110α: Double-sided protruding micro lens

210: first mold

210a: first groove portion

220: second mold

220a: second groove portion

230: lens raw material

240: antireflective coating layer

The terms used in the present invention were selected as general terms as widely used as possible, but in some cases, the terms arbitrarily selected by the applicant are included. In this case, the meanings described or used in the detailed description of the present invention are considered, rather than simply the names of the terms. The meaning should be grasped.

Hereinafter, with reference to the preferred embodiments shown in the accompanying drawings will be described in detail the technical configuration of the present invention.

However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Like numbers refer to like elements throughout the specification.

2 is a step for explaining the manufacturing method of the upper surface protruding microlens according to the present invention, Figure 3 is a step for explaining the manufacturing method of the double-sided protruding microlens according to the present invention.

2 and 3, a method of manufacturing a micro lens according to an exemplary embodiment of the present invention is a method for manufacturing a top protruding micro lens or a double-sided protruding micro lens by vertically cutting a micro lens array in an optical axis direction. As a step, first, a step of preparing the micro lens array 110 is performed (S100).

The micro lens array 110 may be an upper surface protruding micro lens array or a double sided protruding micro lens array.

Here, the upper surface protruding micro lens array is provided in a plate shape, a plurality of micro lens layers 111 spaced apart from each other by a predetermined interval is formed on the upper surface, the lower surface is provided in a flat shape.

In addition, the double-sided protruding micro lens array is provided in a plate shape, and a plurality of first micro lens layers 111 spaced apart from each other by a predetermined interval is formed on an upper surface thereof, and the first micro lens layer 111 is formed on a lower surface thereof. The second micro lens layer 112 is formed in a shape corresponding to the first micro lens layer 111 at a position corresponding to the first micro lens layer 111. That is, the first micro lens layer 111 and the second micro lens layer 112 are formed in plural in sizes corresponding to each other at positions opposing each other on the optical axis.

In addition, the micro lens layers 111 and 112 may have a spherical shape or an aspheric shape.

Next, the adhesive layer 130 is applied to the upper portion of the plate-shaped substrate 120 (S200).

In this case, the adhesive layer 130 may be an oil wax, an aqueous wax or a UV curable resin.

In addition, when the adhesive layer 130 is raised and positioned so that the bottom surface of the micro lens array 110 is positioned on the adhesive layer 130, the bottom surface of the micro lens array 110 and the substrate ( 120 is used in such an amount that one layer can be formed so that it is not in direct contact.

Next, the prepared micro lens array 110 is placed on the adhesive layer 130 applied on the substrate 120, and the adhesive layer 130 is cured so that the micro lens array 110 is formed of the substrate ( 120 to be fixed on (S300).

In this case, the adhesive layer 130 is formed to seal the space between the substrate 120 and the micro lens array 110.

To this end, although not shown in the drawings, the load to be pressed may be increased by using a weight member mounted on the micro lens array 110, or the adhesive layer 130 may be cured by using a normal pressing means. have.

That is, the entire bottom surface of the micro lens array 110 is adhered onto the substrate 120 by the adhesive layer 130.

In addition, when the adhesive layer is an oily wax or an aqueous wax, it is cured by controlling the ambient temperature to correspond to the curing temperature, and when the adhesive layer is a UV curable resin, it is cured by irradiation with ultraviolet rays.

Next, a step of cutting the micro lens array 110 in the optical axis direction a at positions between the neighboring micro lens layers 111 is performed (S400).

In other words, a vertical cut in the direction of the optical axis at the position between the neighboring micro lens layers 111, the cut to be cut into a plurality of micro lenses.

In this case, the cutting means for cutting the micro lens array 110 is not limited as long as it is a means for easily cutting the micro lens array 110, preferably the area forming the blade is coated with diamond May be a liner b.

In addition, since the cutting position, which is a space between the neighboring micro lens layers 111, may be easily changed, the outer size and shape of the micro lens may be freely changed according to the design direction.

Next, a step of removing the adhesive layer 130 adhered between the micro lens array 110 and the substrate 120 is performed (S500).

Here, when the oily wax is used as the adhesive layer 130, the microlens array 110 adhered to the substrate 120 is immersed in ethanol or oil to remove the oily wax.

In addition, when the aqueous wax is used as the adhesive layer 130, the microlens array 110 adhered to the substrate 120 is immersed in distilled water to remove the aqueous wax.

In addition, when the UV curable resin is used as the adhesive layer 130, the microlens array 110 adhered to the substrate 120 is immersed in acetone to remove the UV curable resin.

Next, a micro lens 110α from which the adhesive layer 130 is removed is obtained (S600).

On the other hand, Figure 4 is a step for explaining the step of preparing a top surface protruding micro lens array according to an embodiment of the present invention, below, preparing a micro lens array according to the present invention with reference to FIG. It will be described in more detail.

The microlens array preparation step (S100) is for fabricating a microlens array having a microlens layer 111 spaced apart from each other by a predetermined interval on an upper surface thereof. First, the first mold 210 and the second mold 220 are manufactured. Prepare (S110).

Here, the first mold 210 is a plate shape, the lower surface is formed with a plurality of grooves 210a at different positions on the lower surface.

In addition, the second mold 220 is a metal mold having a flat upper surface and a lower surface.

At this time, the groove portion 210a is preferably formed in a spherical or aspheric shape.

Next, the lens raw material 230 is positioned between the lower surface of the first mold 210 and the upper surface of the second mold 220 (S120).

Here, the lens raw material 230 is preferably a glass material, but is not limited if the material that can function as an optical lens.

Next, pressing the first mold 210 and the second mold 220 is performed (S130).

In this case, the lens raw material 230 is pressed to interview the entire surface of the groove 210a, and the microlens layer 111 corresponding to the groove 210a is formed.

That is, when the groove portion 210a has a spherical shape, the micro lens layer 111 is formed in a spherical shape corresponding thereto, and when the groove portion 210a has an aspherical shape, the micro lens layer 111 has a It is formed in an aspherical shape.

Next, a microlens array 110 having a plurality of microlens layers 111 formed on an upper surface thereof is obtained (S140).

5 is a step diagram for explaining a step of preparing a double-sided protrusion type micro lens array according to an embodiment of the present invention, hereinafter preparing a micro lens array according to the present invention with reference to FIG. It will be described in more detail.

The microlens array preparation step (S100) is for manufacturing a microlens array in which a plurality of first microlens layers 111 and second microlens layers 112 are formed on upper and lower surfaces, respectively. The mold 210 and the second mold 220 are prepared (S110).

Here, the upper surface protruding first mold 210 is a plate shape is a mold formed with a plurality of first grooves 210a at different positions on one side.

In addition, the second mold 220 is a mold having a plate shape corresponding to the first mold 210, and a plurality of second grooves 220a corresponding to the first grooves 210a are formed.

In this case, the first groove 210a and the second groove 220a may be formed in a spherical or aspheric shape.

Next, the lens raw material 230 is positioned between one side of the first mold 210 and one side of the second mold 220 (S120).

Here, the lens raw material 230 is preferably a glass material, but is not limited if the material that can function as an optical lens.

Next, pressing the first mold 210 and the second mold 220 is performed (S130).

In this case, the lens raw material 230 is pressed to interview the entire surface of the first groove portion 210a and the second groove portion 220a, respectively, and the first groove portion 210a and the second groove portion 220a, respectively. Corresponding first micro lens layer 111 and second micro lens layer 112 are formed.

That is, when the first groove 210a and the second groove 220a have a spherical shape, the first micro lens layer 111 and the second micro lens layer 112 have a spherical shape corresponding thereto. When the first groove portion 210a and the second groove portion 220a have an aspherical shape, the first micro lens layer 111 and the second micro lens layer 112 are formed in an aspherical shape.

Next, a microlens array 110 having a plurality of first microlens layers 111 and a plurality of second microlens layers 112 formed on upper and lower surfaces, respectively, is obtained (S140).

In addition, in the method of manufacturing a double-sided protruding microlens according to the present invention, after obtaining the microlens array 110, the antireflective coating layer 240 is applied to at least one of the upper and lower surfaces of the microlens array 110. The anti-reflective coating layer forming step (S150) to be formed may be further performed.

When the antireflection coating layer is formed after the microlenses are manufactured separately, the antireflection coating must be performed on each microlens. However, the manufacturing efficiency decreases. However, after the antireflection coating is performed on the microlens array, the microlens array is vertically cut in the optical axis direction. When manufacturing a lens has the advantage that can increase the coating efficiency.

As described above, in the method of manufacturing a microlens according to the present invention, a plurality of microlenses can be easily manufactured by vertically cutting a neighboring lens layer in an optical axis direction using a microlens array. Since one side of the entire area is stably adhered to the substrate by the adhesive layer, it is easy to vertically cut in the direction of the optical axis has the advantage of minimizing the occurrence of product defects.

In addition, the present invention further provides a top surface protruding micro lens and a double sided protruding micro lens manufactured by the method of manufacturing a double-sided protruding micro lens according to the present invention.

The upper surface protruding microlens 110α is integrally formed on the rectangular parallelepiped body portion 110α-1 and the upper surface of the body portion 110α-1, and has a spherical or aspherical microlens layer 110α. -2) is achieved.

In addition, the double-sided protruding microlens 110α extends integrally on a rectangular parallelepiped body portion 110α-1 and an upper surface of the body portion 110α-1, and has a spherical or aspheric shape first microlens. It is integrally formed on the bottom surface of the layer 110α-2 and the body portion 110α-1, and includes a second micro lens layer 110α-2 having a spherical or aspherical shape.

In addition, the upper surface protruding microlens or the double-sided protruding microlens 110α is plate-shaped optical component 20 while being spaced apart from the laser diode 30 by a predetermined distance so as to align the optical axis with the laser diode 30. It may be provided at the upper surface of the single optical module.

At this time, the microlens 110α according to the present invention, since the body portion 110α-1 is provided in a rectangular parallelepiped shape, is installed parallel to the optical component 20 without being inclined to facilitate optical axis alignment.

In addition, the entire surface of one side of the body portion 110α-1 is attached to the upper surface of the optical component 20, and as the surface is roughened, the surface roughness of one side of the body portion 110α-1 is rough. In addition, the adhesive force is increased on the optical component, thereby improving the assembly reliability of the microlens.

As described above, the present invention has been illustrated and described with reference to preferred embodiments, but is not limited to the above-described embodiments, and is provided to those skilled in the art without departing from the spirit of the present invention. Various changes and modifications will be possible.

Microlenses according to the present invention can be used in the next-generation optical systems, such as optical communication, optical information storage device, sensor, display.

In particular, in the optical communication field, the collimating lens may be used as a collimating lens for collimating the emitted light by being placed in front of a light source array including a plurality of laser diodes or LEDs.

Claims (12)

A micro lens array preparation step of preparing a micro lens array in which a plurality of micro lens layers spaced apart from each other by a predetermined distance is formed; An adhesive layer applying step of applying an adhesive layer on the plate-shaped substrate; The microlens array is placed on top of the adhesive layer and the adhesive layer is cured to fix the microlens array on the substrate, wherein the adhesive layer fixes the microlens array to seal a space between the substrate and the microlens array. step; A microlens array cutting step of cutting in the optical axis direction at a position between the neighboring microlens layers; An adhesive layer removing step of removing the adhesive layer; And And obtaining a microlens to obtain a microlens from which the adhesive layer has been removed. The micro lens array may include an upper surface protruding micro lens array having the micro lens layers formed on an upper surface thereof, or the micro lens layers formed on an upper surface and a lower surface thereof, respectively. And the second micro lens layers formed on the surface are double-sided protruding micro lens arrays formed at positions opposing each other on the optical axis. The method of claim 1, The first micro lens layer and the second micro lens layer are A method of manufacturing a micro lens, characterized in that the spherical or aspherical shape. The method of claim 1, The micro lens array preparation step A mold preparation step of preparing a first mold having a plurality of grooves formed at different positions on one side thereof in a plate shape, and a second mold having one side flat in the shape of a plate; Positioning a lens raw material between one side of the first mold and one side of the second mold; Pressing the first mold and the second mold; Obtaining a microlens array having a microlens layer formed on an upper surface thereof. The method of claim 1, Preparing the micro lens array A first mold having a plurality of first grooves formed at different positions on one side thereof in a plate shape, and a plurality of second grooves corresponding to the groove portions of the first mold in one side thereof in a plate shape corresponding to the first mold; A mold preparation step of preparing an additionally formed second mold; Positioning a lens raw material between one side of the first mold and one side of the second mold; Pressing the first mold and the second mold; And Obtaining a microlens array in which a first microlens layer and a second microlens layer are formed on upper and lower surfaces, respectively. The method according to claim 3 or 4, The first groove portion and the second groove portion A method of manufacturing a micro lens, characterized in that the spherical or aspherical shape. The method of claim 1, The adhesive layer is a manufacturing method of a micro lens, characterized in that oily wax, aqueous wax or UV curable resin is used. The method of claim 6, When the adhesive layer is an oily wax, In the removing of the adhesive layer, the microlens array attached to the substrate is immersed in ethanol or oil to remove the oily wax. The method of claim 6, When the adhesive layer is an aqueous wax, In the removing of the adhesive layer, the microlens array attached to the substrate is immersed in distilled water to remove the oily wax. The method of claim 6, When the adhesive layer is a UV curable resin, And removing the adhesive layer by dipping the microlens array attached to the substrate in acetone to remove the oily wax. The method according to claim 3 or 4, Preparing the micro lens array After obtaining the micro lens array The anti-reflective coating layer forming step of forming an anti-reflective coating layer on at least one of the upper surface and the lower surface of the obtained micro lens array; Method of manufacturing a micro lens further comprising. It is produced by the method for producing a micro lens of any one of claims 1 to 10, A rectangular parallelepiped body portion; And a microlens layer having a spherical or aspherical shape integrally extending on the upper or lower surface of the body portion. It is produced by the method for producing a micro lens of any one of claims 1 to 10, A rectangular parallelepiped body portion; A first micro lens layer integrally formed on an upper surface of the body portion and having a spherical or aspherical surface shape; And And a second micro lens layer integrally formed on the bottom surface of the body portion and having a spherical or aspherical surface shape.

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