KR20230095504A - Apparatus and method for manufacturing substrates of optical devices for augmented reality - Google Patents

Abstract

Provided are an apparatus and method for manufacturing substrates of optical devices for augmented reality. The apparatus comprises: a first mold in which a plurality of unit inclined portions are formed; a second mold disposed opposite to the first mold and spaced apart from the first mold; a transfer device moving the second mold toward the first mold; and an ultraviolet irradiator irradiating ultraviolet rays to an ultraviolet curing resin injected into a molding space between the first mold and the second mold.

Description

Substrate manufacturing device and manufacturing method of optical devices for augmented reality

The present invention relates to an apparatus and method for manufacturing a substrate of an optical device for augmented reality, and more particularly, by appropriately compensating for shrinkage of a UV curable resin that occurs when a substrate constituting a lens of an optical device for augmented reality is molded. It relates to a substrate manufacturing apparatus and manufacturing method capable of suppressing shape errors due to

As is well known, augmented reality (AR) refers to virtual image information augmented from visual information of the real world by overlapping a virtual image provided by a computer or the like with a real image of the real world. It refers to technology that is simultaneously provided to users.

An apparatus for realizing such augmented reality requires an optical combiner that enables simultaneous observation of virtual images and real images in the real world. As such an optical synthesizer, a half mirror method and a holographic/diffractive optical element (HOE/DOE) method are known.

The semi-mirror method has a problem in that the transmittance of the virtual image is low and it is difficult to provide a comfortable fit because the volume and weight are increased to provide a wide viewing angle. In order to reduce the volume and weight, a technology such as a so-called LOE (Light guide Optical Element) in which a plurality of small half mirrors are placed inside a waveguide has also been proposed, but this technology also has a half mirror of a virtual image inside the waveguide. Since it has to pass through several times, the manufacturing process is complicated and there is a limitation that the light uniformity is generally lowered.

In addition, the holographic/diffractive optical element method generally uses a nanostructured grating or a diffraction grating, and since they are manufactured in a very precise process, they have limitations in that the manufacturing cost is high and the yield for mass production is low. In addition, due to the difference in diffraction efficiency according to the wavelength band and the incident angle, it has limitations in terms of color uniformity and low sharpness of the image. Holographic/diffractive optical elements are often used with waveguides such as the LOEs described above, and therefore still have the same problems.

In addition, conventional optical synthesizers have limitations in that a virtual image is out of focus when a user changes a focal length when gazing at the real world. In order to solve this problem, a technique using a prism capable of adjusting the focal length of a virtual image or a variable focus lens capable of electrically controlling the focal length has been proposed. However, this technique also has a problem in that a user must perform a separate operation to adjust the focal length or require separate hardware and software for controlling the focal length.

In order to solve the problems of the prior art, the present applicant has developed a technique of projecting a virtual image onto the retina through the pupil using a reflector in the form of a pin mirror having a size smaller than that of the human pupil ( see Prior Art Document 1).

1 is a diagram showing an optical device 100 for augmented reality as described in Prior Art Document 1.

The optical device 100 for augmented reality of FIG. 1 includes a lens 10, a reflector 20, and an image emitter 30.

The lens 10 transmits real object image light, which is image light emitted from objects in the real world, through the pupil 40 while emitting the virtual image image light reflected by the reflector 20 into the pupil 40. is a means of Inside the lens 10, the reflector 20 is buried and disposed.

The lens 10 may be formed of, for example, a transparent resin material such as a spectacle lens, and may be fixed by a frame (not shown) such as a spectacle frame.

The image emitter 30 is means for emitting virtual image light, for example, a micro display device that displays a virtual image on a screen and emits virtual image image light corresponding to the displayed virtual image, and image light emitted from the micro display device. may be provided with a collimator for collimating the

The reflector 20 is a means for reflecting the virtual video image light emitted from the image emitter 30 and transmitting it toward the pupil 40 of the user.

The reflector 20 of FIG. 1 is formed to have a smaller size than a human pupil. Since it is known that the size of a normal human pupil is about 4 to 8 mm, the reflector 20 is preferably formed to a size of 8 mm or less, more preferably 4 mm or less. By forming the reflector 20 to a thickness of 8 mm or less, the depth of field for light entering the pupil 40 through the reflector 20 can be made almost infinite, that is, very deep.

Here, the depth of field refers to a range recognized as being in focus. As the depth of field increases, the focal length of the virtual image correspondingly increases. Therefore, even if the user changes the focal length of the real world while gazing at the real world, it is recognized that the focus of the virtual image is always correct regardless of this. This can be regarded as a kind of pinhole effect.

Accordingly, by forming the reflector 20 to have a smaller size than the pupil 40, the user can always observe a clear virtual image even if the user changes the focal length of the real object.

2 to 4 are views showing an optical device 200 for augmented reality as disclosed in Prior Art Document 2, FIG. 2 is a side view, FIG. 3 is a perspective view, and FIG. 4 is a front view.

The optical device 200 for augmented reality of FIGS. 2 to 4 has the same basic principle as the optical device 100 for augmented reality of FIG. It consists of modules 21 to 26 and is arranged inside the lens 10 in the form of an array, and the virtual image image light emitted from the image output unit 30 is totally reflected from the inner surface of the lens 10 to reflect There is a difference in that it is passed to (20).

In the optical device 200 for augmented reality of FIGS. 2 to 4 , the virtual image image light emitted from the image emitting unit 30 is totally reflected on the inner surface of the lens 10 and then transmitted to the reflection modules 21 to 26 . , The plurality of reflection modules 21 to 26 reflect incident virtual video image light and transmit it to the pupil 40 .

In this way, the virtual image image light emitted from the image emitter 30 is transmitted to the reflection modules 21 to 26, and the reflection modules 21 to 26 reflect the virtual image image light toward the user's pupil 40. Therefore, the reflection modules 21 to 26 should be arranged to have an appropriate inclination angle inside the lens 10 as shown in FIG. 2 in consideration of the positions of the image output unit 30 and the pupil 40. .

The lens 10 of the optical device 200 for augmented reality may be formed through the following process.

5 and 6 are views for explaining a manufacturing process of the optical device 200 for augmented reality.

As shown in FIG. 5(a), a first substrate 10A and a second substrate 10B constituting the lens 10 are formed.

The first substrate 10A and the second substrate 10B have saw-toothed unit inclined portions 15 formed to engage with each other. Profiles such as the shape, size, and height of the unit inclined portions 15 may vary depending on the design requirements of the optical device 200 for augmented reality, and in FIGS. 5 and 6, the shapes shown in FIGS. A case of manufacturing the optical device 200 for augmented reality will be described as an example.

When the first substrate 10A and the second substrate 10B are formed, as shown in FIG. 5(b), the reflection is reflected on each inclined surface 151 of the unit inclined portion 15 of the first substrate 10A. Each of the modules 21 to 26 is formed. After the reflective modules 21 to 26 are formed, the lens 10 is completed by adhering the first substrate 10A and the second substrate 10B with an adhesive 16 and fixing them in close contact.

Here, as shown in FIG. 6, the first substrate 10A and the second substrate 10B are molded with an ultraviolet curing resin having a shape corresponding to the shape of each unit inclined portion 15. It may be formed by injecting (17) and then curing by irradiating ultraviolet rays.

At this time, the UV curable resin 17 contracts due to a difference in stress while being cured by UV rays, which causes a shape error on the surface where the UV curable resin 17 contacts the mold 80. This is especially noticeable at the inclined surface 151 and the end of the unit inclined portion 15. Accordingly, the optical performance of the substrates 10A and 10B and the lens 10 is degraded, and as a result, the overall optical performance of the optical device 200 for augmented reality is degraded. In this respect, when molding the substrates 10A and 10B constituting the lens 10, a method and apparatus capable of minimizing a shape error due to shrinkage by appropriately compensating for the shrinkage problem are desired.

Republic of Korea Patent Publication No. 10-2018-0028339 (published on March 16, 2018) Republic of Korea Patent Registration No. 10-2192942 (2020.12.18. Notice)

The present invention is to solve the above problems, and to appropriately compensate for the shrinkage of the UV curable resin that occurs when molding a substrate constituting a lens of an optical device for augmented reality, thereby suppressing shape errors due to shrinkage. It aims at providing a substrate manufacturing apparatus and manufacturing method.

In order to solve the above problems, the present invention is an apparatus for manufacturing a substrate of an optical device for augmented reality, comprising: a first mold formed with a plurality of unit inclined portions; a second mold disposed to be spaced apart from the first mold; a transfer device for moving the second mold toward the first mold; and an ultraviolet irradiator for irradiating ultraviolet light to the ultraviolet curable resin injected into the molding space between the first mold and the second mold.

Here, after the UV curable resin is injected into the molding space between the first mold and the second mold, the UV irradiator irradiates UV rays toward the injected UV curable resin to cure the UV curable resin, while the transfer device A substrate molding process may be performed by moving the second mold toward the first mold to pressurize the UV curable resin in the molding space.

In addition, the substrate forming process may be repeatedly performed, but the amount of ultraviolet light irradiated from the ultraviolet irradiator may be adjusted to be the same as or increase in the previous substrate forming process.

In addition, the amount of light of the ultraviolet irradiator in the substrate forming process may be smaller than the amount of light of ultraviolet light irradiated when the second mold moves to a preset target position.

In addition, after the substrate molding process is repeatedly performed until the second mold moves to a preset target position, the UV curable resin may be completely cured by maximizing the amount of UV light irradiated from the UV irradiator.

In addition, the injection port that is a passage through which the UV curable resin is injected into the molding space between the first mold and the second mold; an inlet cover for shielding the inlet; a discharge port through which the UV curable resin is discharged to the outside in the molding space between the first mold and the second mold; And it may further include an outlet cover for shielding the outlet.

In addition, after the UV curable resin is completely cured, a release device for separating the UV curable resin from the first mold may be further included.

According to another aspect of the present invention, a method for manufacturing a substrate of an optical device for augmented reality includes a UV curing resin in a molding space between a first mold formed with a plurality of unit inclined portions and a second mold spaced apart from the first mold. A first step of injecting; and a second step of irradiating ultraviolet rays into the molding space between the first mold and the second mold to cure the ultraviolet curable resin while moving the second mold toward the first mold to pressurize the ultraviolet curable resin in the molding space. Including, while repeating the second step at least once, manufacturing a substrate of an optical device for augmented reality, characterized in that for each repetition, the amount of irradiated ultraviolet rays is adjusted to be the same as or to increase compared to the previous step provides a way

Here, after the first step, the injection port into which the UV curable resin is injected may be shielded.

Also, in the second step, the second mold may be moved toward the first mold to pressurize the UV-curable resin in the molding space in the direction of the first mold.

In addition, the substrate forming process may be repeatedly performed, but the amount of ultraviolet light irradiated from the ultraviolet irradiator may be adjusted to be the same as or increase in the previous substrate forming process.

Also, in the second step, the amount of light from the ultraviolet irradiator may be less than the amount of light of ultraviolet rays set to be irradiated when the second mold moves to a preset target position.

In addition, after the second step is repeatedly performed until the second mold moves to a preset target position, the UV curable resin may be completely cured by maximizing the amount of UV light irradiated from the UV irradiator.

In addition, when the second mold moves to a preset target position, an outlet, which is a passage through which the UV curable resin is discharged to the outside, in the molding space between the first mold and the second mold may be blocked.

The method may further include separating the UV curable resin from the first mold after the UV curable resin is completely cured.

According to the present invention, it is to provide a substrate manufacturing apparatus and manufacturing method capable of suppressing shape errors due to shrinkage by appropriately compensating for shrinkage of an ultraviolet curable resin that occurs when a substrate constituting a lens of an augmented reality optical device is molded. can

In particular, according to the present invention, an optical device for augmented reality is provided by providing a device and method capable of minimizing a shape error due to shrinkage of a unit inclined portion in a simple and efficient manner when manufacturing a lens having a unit inclined portion. There is an effect of improving the overall optical performance of and significantly reducing the manufacturing cost.

1 is a diagram showing an optical device 100 for augmented reality as described in Prior Art Document 1.
2 to 4 are views showing an optical device 200 for augmented reality as disclosed in Prior Art Document 2, FIG. 2 is a side view, FIG. 3 is a perspective view, and FIG. 4 is a front view.
5 and 6 are views for explaining a manufacturing process of the optical device 200 for augmented reality.
7 is a diagram showing the overall configuration of a substrate manufacturing apparatus 500 used in the substrate manufacturing method of an optical device for augmented reality according to the present invention.
FIG. 8 is a cross-sectional view taken along line AA′ of FIG. 7, and is for explaining an example of the configuration of the ultraviolet irradiator 540. Referring to FIG.
9 is a flowchart showing an embodiment of a substrate manufacturing method according to the present invention.
10 is a view showing a state in which the inlet 571 is shielded.
11 is a diagram for explaining step S110.
FIG. 12 is a diagram for explaining a shape error due to shrinkage occurring in the unit inclined portion 511 of the first mold 510 and a process for compensating for the shape error.
13 is a diagram for explaining step S130.
14 is a diagram for explaining step S140.
15 is a graph showing a change in the amount of ultraviolet light with respect to the distance between the first mold 510 and the second mold 520 .

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

7 is a cross-sectional view showing the overall configuration of a substrate manufacturing apparatus 500 used in the substrate manufacturing method of an optical device for augmented reality according to the present invention.

Referring to FIG. 7 , the substrate manufacturing apparatus 500 includes a first mold 510 , a second mold 520 , a transfer device 530 and an ultraviolet irradiator 540 .

As described above with reference to FIGS. 2 to 4 , the substrate manufacturing apparatus 500 having such a configuration includes the substrates 10A and 10B constituting the lens 10 of the optical device 200 for augmented reality, and the unit inclined portion 15 is formed. It can be used to manufacture substrates 10A and 10B having However, it should be noted that FIG. 7 is slightly different from the actual sizes of the substrates 10A and 10B of the optical device 200 for augmented reality of FIGS. 2 to 4 for convenience of description.

The first mold 510 and the second mold 520 are spaced apart from each other, and a molding space 550 is provided between them. An ultraviolet curing resin 560 is injected into the molding space 550 .

A unit inclined portion 511 is formed on the surface of the first mold 510 .

Here, the unit inclined portion 511 is formed in a sawtooth shape in cross section as shown, which is the substrate of the lens 10 of the optical device 200 for augmented reality as described in FIGS. 2 to 4 ( 10A, 10B) has a form corresponding to. However, this is exemplary, and the shape, size, height, etc. of the unit inclined portion 511 may have different profiles depending on the conditions of the substrates 10A and 10B to be manufactured.

The second mold 520 is spaced apart from the first mold 510 and has a flat surface.

As will be described later, the first mold 510 and the second mold 520 transmit ultraviolet rays irradiated from the buried ultraviolet irradiator 540 and transmit them to the ultraviolet curable resin 560 injected into the molding space 550. Therefore, it is preferable to be formed of a material capable of transmitting ultraviolet rays, and more preferably formed of a transparent material.

The transfer device 530 is a device for moving the second mold 520 in the direction of the first mold 510 . The transfer device 530 is operated by a control signal from a controller (not shown).

Such a transfer device 530 may be, for example, a bar-shaped guide capable of sliding and moving the second mold 520 by the rotational force of the motor coupled to a motor (not shown). Alternatively, the transfer device 530 may be formed in a screw shape to move the second mold 520 in the direction of the first mold 510 while rotating by the rotational force of the motor.

Such a transfer device 530 itself is not a direct object of the present invention, and as long as it can move the second mold 520 in the direction of the first mold 510, various mechanisms known in the prior art can be used. A detailed description thereof will be omitted.

The first mold 510 and the second mold 520 are placed on a stage 583, the first mold 510 is fixed to the stage 583, and the second mold 520 is a transfer device 530 By the driving of the slide movement on the stage 583.

The ultraviolet irradiator 540 is a device that irradiates ultraviolet rays to the ultraviolet curable resin 560 injected into the molding space 550 between the first mold 510 and the second mold 520 .

As shown, the ultraviolet irradiator 540 is disposed and buried inside the first mold 510 and the second mold 520 . However, this is exemplary, and may be disposed outside the first mold 510 and the second mold 520, of course.

In addition, the ultraviolet irradiator 540 may be disposed on only one of the first mold 510 and the second mold 520 as needed.

FIG. 8 is a cross-sectional view taken along the line A-A′ of FIG. 7, and is for explaining an example of the configuration of the ultraviolet irradiator 540.

As shown in FIG. 8 , the ultraviolet irradiator 540 may be implemented with a plurality of ultraviolet LEDs 541 embedded in the first mold 510 and the second mold 520 . By uniformly distributing and arranging a plurality of UV LEDs 541 having the same performance, the UV curing resin 560 can be irradiated with a uniform amount of UV light. The UV LED 541 may be disposed by measuring the amount of UV light in advance using a power meter and confirming a uniform amount of light at each position of the UV LED 541 . However, this is an example, and other suitable UV irradiation means can be used, of course.

The UV irradiator 540 may be combined with a controller (not shown) to cure the UV curable resin 560 by irradiating UV rays according to a control signal from the controller.

Meanwhile, the substrate manufacturing apparatus 500 may include an inlet 571 , an inlet cover 572 , an outlet 581 , and an outlet cover 582 .

The injection hole 571 is a passage through which the UV curable resin 560 is injected into the molding space 550 between the first mold 510 and the second mold 520, and the injection hole cover 572 covers the injection hole 571. It is a means to cover up.

The injection port cover 572 is formed to be movable in the horizontal direction in FIG. 7 , and after the UV curable resin 560 is injected into the molding space 550 , it moves in the right direction to shield the injection port 571 .

The outlet 581 is a passage through which the UV curable resin 560 is discharged to the outside in the molding space 550 between the first mold 510 and the second mold 520, and the outlet cover 582 is the outlet 581 ) is a means for shielding.

The outlet cover 582 is also formed to be movable in the horizontal direction in FIG. 7 , and moves in the right direction when the second mold 520 is moved to the initial state and to a preset target position as will be described later, so that the outlet 581 to shield Also, in the state shown in FIG. 11 , the outlet cover 582 may move so as not to completely cover the outlet 581 .

Meanwhile, the outlet 581 and the outlet cover 582 may be omitted if necessary, and in this case, the UV curable resin injected into the molding space 550 between the first mold 510 and the second mold 520 ( 560) needs to be properly adjusted.

In addition, the substrate manufacturing apparatus 500 may further include a release device 590 .

As will be described later, the release device 590 is a device for separating the UV curable resin 560 from the first mold 510 after the UV curable resin 560 is completely cured.

The release device 590 is buried inside the first mold 510 and may be formed as a slideable bar-shaped guide drawn toward the second mold 520 .

Meanwhile, although not shown, a controller for controlling the overall operation of the substrate manufacturing apparatus 500 may be further included. The controller may control the driving of the transfer device 530 to adjust the moving distance/position of the second mold 520 . In addition, the controller may adjust the amount of UV light emitted from the UV irradiator 540 .

This substrate manufacturing apparatus 500 is characterized in that it operates as follows.

That is, in the initial state as shown in FIG. 7, when the UV curable resin 560 is injected into the molding space 550 through the injection port 571 between the first mold 510 and the second mold 520, the UV irradiator ( 540 irradiates ultraviolet rays toward the ultraviolet curable resin 560 in the molding space 550 to cure the ultraviolet curable resin 560 . At the same time, the transfer device 530 is driven to move the second mold 520 toward the first mold 510 to perform a substrate molding process of pressurizing the UV curable resin 560 in the molding space 550 .

This substrate forming process may be repeated one or more times, and the amount of ultraviolet light irradiated from the ultraviolet irradiator 540 is adjusted to be the same as or increase in the previous substrate forming process.

While repeating such a substrate molding process, when the second mold 520 moves to a preset target position, the amount of UV light irradiated from the UV irradiator 540 is maximized to completely cure the UV curable resin 560, , thereby molding the substrates 10A and 10B.

Next, referring to FIG. 9 and below, a substrate manufacturing method performed by the above-described substrate manufacturing apparatus 500 will be described.

9 is a flowchart showing an embodiment of a substrate manufacturing method according to the present invention.

First, an ultraviolet curable resin 560 is injected into the substrate manufacturing apparatus 500 in an initial state as shown in FIG. 7 (S100).

At this time, the inlet cover 572 is in an open state, and the outlet cover 582 is in a shielded state. In this state, as described above, the molding space 550 between the first mold 510 in which the plurality of unit inclined portions 511 are formed and the second mold 520 disposed to face the first mold 510 Inject the UV curable resin 560 through the injection port 571. The ultraviolet curable resin 560 at this time is preferably in a liquid state, and may be in a semi-liquid state.

When the UV curable resin 560 is injected, the injection hole 571 is shielded by the injection hole cover 572 .

10 is a view showing a state in which the inlet 571 is shielded.

7, when the injection of the UV curable resin 560 into the molding space 550 is completed in the initial state as shown in FIG.

Next, ultraviolet rays from the ultraviolet irradiator 540 are irradiated into the molding space 550 between the first mold 510 and the second mold 520, and thereby the ultraviolet curable resin injected into the molding space 550 ( 560) begins to harden. At the same time, the transfer device 530 is driven to move the second mold 520 toward the first mold 510, thereby performing a substrate molding process of pressurizing the UV curable resin 560 in the molding space 550 ( S110).

At this time, as shown in FIG. 11, the outlet cover 582 is moved to the left so that the outlet 581 is not completely blocked.

11 is a diagram for explaining step S110.

Referring to FIG. 11 , it can be seen that the second mold 520 is moved in the direction of the first mold 510 while the ultraviolet irradiator 540 irradiates the ultraviolet rays in the initial state as shown in FIG. 7 .

As such, when the second mold 520 moves toward the first mold 510, the ultraviolet curable resin 560 is pressed in the direction of the first mold 510, whereby the ultraviolet curable resin 560 moves toward the first mold ( It moves toward the inclined surface 512 of the unit inclined portion 511 of 510 . Therefore, the occurrence of shape error can be suppressed by compensating for the contraction of the UV curable resin 560 due to the pressure of the UV curable resin 560 on the inclined surface 512 of the unit inclined portion 511 of the first mold 510. there is.

FIG. 12 is a diagram for explaining a shape error due to shrinkage occurring in the unit inclined portion 511 of the first mold 510 and a process for compensating for the shape error.

As shown, the UV curable resin 560 is cured by ultraviolet rays irradiated from the ultraviolet irradiator 540, and at this time, it is gradually contracted and cured from the side close to the direction in which the ultraviolet rays are incident. That is, shrinkage occurs from a portion of the UV curable resin 560 that contacts the first mold 510, and as a result, a gap 513 is generated between the UV curable resin 560 and the first mold 510.

At this time, as described above, when the second mold 520 is moved toward the first mold 510 by the transfer device 530, the ultraviolet curable resin 560 is pressed toward the first mold 510. As a result, the UV curable resin 560 is pushed toward the gap 513 to move, and thus the gap 513 can be removed.

On the other hand, although not shown, since ultraviolet rays are also irradiated from the side of the second mold 520, the ultraviolet curable resin 560 on the side close to the second mold 520 is also cured and shrinkage may occur as described above. A gap may occur due to this contraction, but this gap may also be removed by pushing force while the second mold 520 moves to the first mold 510 as described above.

Here, since the UV curable resin 560 needs to be pressed by the second mold 520, it must be in a viscous semi-liquid state without being completely cured. Therefore, the amount of UV light irradiated at this time must be large enough to prevent the UV curable resin 560 from being completely cured. In other words, the amount of ultraviolet light in the substrate molding process (S110) is set to be irradiated when the ultraviolet curing resin 560 is completely cured, that is, when the second mold 520 moves to the target position. should have a smaller value.

Meanwhile, although the above step (S110) has been described as being performed simultaneously, it goes without saying that it may be performed separately. For example, ultraviolet rays may be first irradiated by the ultraviolet irradiator 540 and then the second mold 520 may be moved in the direction of the first mold 510 . Alternatively, in some cases, the second mold 520 may be first moved in the direction of the first mold 510 and then ultraviolet rays may be irradiated.

Meanwhile, while the second mold 520 moves in the direction of the first mold 510, the gap 513 is removed as described above, while the excess UV curable resin 560 is discharged through the outlet 581. It can be.

As described above, since the outlet 581 is not completely covered by the outlet cover 582, the UV curable resin 560 may be discharged through a portion of the outlet 581. At this time, by adjusting the moving position of the outlet cover 582, the amount of the UV curable resin 560 discharged according to other conditions such as pressure and volume in the process may be adjusted. If the outlet 581 is too open, it may be difficult to completely remove the gap 513 by pressing while the second mold 520 moves in the direction of the first mold 510, so the moving position of the outlet cover 582 It is necessary to appropriately adjust the degree of opening of the discharge port 581 by adjusting. In some cases, it is also possible to completely shield the outlet 581.

Next, it is determined whether the second mold 520 has moved to the target position (S120).

When it is determined that the substrate has not moved to the target position, the above-described substrate forming process (S110) is repeatedly performed.

At this time, while the substrate forming process (S110) is repeatedly performed, the amount of ultraviolet light irradiated from the ultraviolet irradiator 540 at each repetition is equal to or greater than the light amount of ultraviolet light in the previous substrate forming process (S110). Adjust.

Accordingly, as the substrate molding process step ( S110 ) is repeatedly performed, the amount of UV light gradually increases, and accordingly, the UV curing resin 560 is gradually cured correspondingly.

Meanwhile, when the above step S110 is repeatedly performed, the distance to be moved by the second mold 520 may be preset or variably adjusted according to the state of the UV curable resin 560 .

Then, when it is determined that the second mold 520 has moved to the target position, the outlet 581 is shielded by the outlet cover 582 . Then, the UV curable resin 560 is completely cured by maximizing the amount of UV light emitted from the UV irradiator 540 (S130).

FIG. 13 is a diagram for explaining step S130, showing a state in which the ultraviolet curing resin 560 is finally cured by the ultraviolet irradiator 540 irradiating the maximum amount of ultraviolet light in a state in which the outlet 581 is blocked. will be.

When the UV curable resin 560 is completely cured, the second mold 520 is moved in the opposite direction, and then the UV curable resin 560 is separated from the first mold 510 (S140).

14 is a diagram for explaining step S140.

As shown in FIG. 14 , when the UV curable resin 560 is finally completely cured, the transfer device 530 is driven to return the second mold 520 to its initial position. Then, the release device 590 is pulled out from the inside of the first mold 510 toward the second mold 520 and thereby pushes the cured UV curable resin 560 toward the second mold 520 . Accordingly, the UV curable resin 560 may be separated from the first mold 510 .

As described above, in the substrate manufacturing method according to the present invention, while moving the second mold 520 while repeatedly performing the substrate molding process (S110) in a state before the ultraviolet curable resin 560 is completely cured, the ultraviolet curable resin ( 560), it is necessary to appropriately adjust the light intensity of ultraviolet rays in each of the substrate forming process (S110) and the process of completely curing the ultraviolet curable resin (S130).

15 is a graph showing a change in the amount of ultraviolet light with respect to the distance between the first mold 510 and the second mold 520 .

In FIG. 15 , the maximum value of the amount of light of ultraviolet rays is indicated as 10, which indicates the amount of light of ultraviolet rays when the ultraviolet curable resin 560 is completely cured.

As shown in FIG. 15, it can be seen that as the distance increases, the amount of ultraviolet light gradually increases from 1, and as the distance gradually decreases, the amount of ultraviolet light increases rapidly.

In this way, by adjusting the amount of ultraviolet light according to the distance between the second mold 520 and the first mold 510, the substrate forming process (S110) is repeatedly performed in a state before the ultraviolet curable resin 560 is completely cured, while the ultraviolet rays Shrinkage of the cured resin 560 can be efficiently compensated.

When the curing of the UV curable resin 560 is completed through this process, a post-processing process such as cutting it into an appropriate size is performed if necessary to finally form the substrates 10A and 10B.

Thereafter, the lens 10 may be formed by forming the reflective modules 21 to 26 on the substrates 10A and 10B as described in FIG. 5 and bonding the substrates 10A and 10B with an adhesive 16 .

In the above, the present invention has been described with reference to preferred embodiments of the present invention, but the present invention is, of course, not limited to the above embodiments.

For example, although it has been described that only the second mold 520 is moved in the above embodiment, a configuration in which the first mold 510 is also moved is also possible.

In addition, although an ultraviolet curing resin was used in the above embodiment, it is also possible to use a thermal curing method using a thermosetting resin.

In addition, in the above embodiment, it has been described that the first mold 510 and the second mold 520 are disposed vertically with respect to the ground so that the second mold 520 moves in the horizontal direction, but the second mold 520 Of course, after disposing the above and placing the first mold 510 below, the second mold 520 may be moved in the vertical direction.

500 ... Substrate manufacturing equipment
510 ... first mold
520 ... second mold
530 ... transport unit
540 ... UV irradiator
550 ... forming space
560 ... UV curing resin
571 ... inlet
572 ... inlet cover
581 ... Outlet
582 ... outlet cover
590 ... release device

Claims (15)

An apparatus for manufacturing a substrate of an optical device for augmented reality,
a first mold in which a plurality of unit inclined portions are formed;
a second mold disposed to be spaced apart from the first mold;
a transfer device for moving the second mold toward the first mold; and
An ultraviolet irradiator that irradiates ultraviolet rays to the ultraviolet curable resin injected into the molding space between the first mold and the second mold
A substrate manufacturing apparatus of an optical device for augmented reality comprising a. The method of claim 1,
After the UV curable resin is injected into the molding space between the first mold and the second mold, the UV irradiator irradiates ultraviolet rays toward the injected UV curable resin to cure the UV curable resin, and the transfer device moves the first 2. An apparatus for manufacturing a substrate of an optical device for augmented reality, characterized in that a substrate molding process of moving the mold toward the first mold and pressing the ultraviolet curable resin in the molding space is performed. The method of claim 2,
The substrate forming process is repeatedly performed, but the amount of ultraviolet light irradiated from the ultraviolet irradiator is adjusted to equal or increase the amount of ultraviolet light emitted from the ultraviolet irradiator in the previous substrate forming process. manufacturing device. The method of claim 3,
The substrate manufacturing apparatus of an optical device for augmented reality, characterized in that the amount of light of the ultraviolet irradiator in the substrate forming process is smaller than the amount of ultraviolet light set to be irradiated when the second mold moves to a preset target position. The method of claim 4,
After repeating the substrate molding process until the second mold moves to a preset target position, the UV curable resin is fully cured by maximizing the amount of UV light irradiated from the UV irradiator For augmented reality, characterized in that A device for manufacturing a substrate for an optical device. The method of claim 1,
an injection port through which an ultraviolet curable resin is injected into a molding space between the first mold and the second mold;
an inlet cover for shielding the inlet;
a discharge port through which the UV curable resin is discharged to the outside in the molding space between the first mold and the second mold; and
The outlet cover for shielding the outlet
A substrate manufacturing apparatus of an optical device for augmented reality, characterized in that it further comprises. The method of claim 1,
After the UV curable resin is completely cured, the substrate manufacturing apparatus of the optical device for augmented reality, characterized in that it further comprises a release device for separating the UV curable resin from the first mold. A method for manufacturing a substrate of an optical device for augmented reality,
A first step of injecting an ultraviolet curable resin into a molding space between a first mold formed with a plurality of unit inclined portions and a second mold spaced apart from the first mold; and
A second step of irradiating ultraviolet rays into the molding space between the first mold and the second mold to cure the ultraviolet curable resin and moving the second mold toward the first mold to pressurize the ultraviolet curable resin in the molding space.
Including,
A method of manufacturing a substrate for an optical device for augmented reality, characterized in that the second step is repeatedly performed at least once, and the amount of ultraviolet light irradiated at each repetition is adjusted to be equal to or increased from the previous step. The method of claim 8,
After the first step, the substrate manufacturing method of the optical device for augmented reality, characterized in that for shielding the injection hole into which the ultraviolet curable resin is injected. The method of claim 8,
In the second step, the substrate manufacturing method of the optical device for augmented reality, characterized in that by moving the second mold toward the first mold to press the ultraviolet curable resin in the molding space in the direction of the first mold. The method of claim 10,
The substrate forming process is repeatedly performed, but the amount of ultraviolet light irradiated from the ultraviolet irradiator is adjusted to equal or increase the amount of ultraviolet light emitted from the ultraviolet irradiator in the previous substrate forming process. manufacturing method. The method of claim 11,
In the second step, the amount of light of the ultraviolet irradiator is smaller than the amount of ultraviolet light set to be irradiated when the second mold moves to a preset target position. The method of claim 12,
After repeating the second step until the second mold moves to a preset target position, the UV curable resin is fully cured by maximizing the amount of UV light irradiated from the UV irradiator For augmented reality, characterized in that A method for manufacturing a substrate for an optical device. The method of claim 13,
When the second mold moves to a preset target position, an outlet, which is a passage through which the UV curable resin is discharged to the outside, is shielded in the molding space between the first mold and the second mold. A method for manufacturing a substrate of an optical device for reality. The method of claim 14,
After the UV curable resin is completely cured, the method of manufacturing a substrate for an optical device for augmented reality further comprising the step of separating the UV curable resin from the first mold.

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