KR102612558B1 - Hologram printing apparatus for recording of holographic elements images tiling multiple spatial light modulator - Google Patents

Abstract

A hologram recording device that records hologram element images by tiling a plurality of spatial light modulators is disclosed.
The hologram recording device includes a plurality of spatial light modulators (SLMs) that output a signal beam modulated into a hologram element image; Reflectors that reflect signal beams output from each of the spatial light modulators to a tiling device; and a tiling device including total reflection prisms that tile the plurality of signal beams reflected from the reflectors by reflecting them in a direction where the hologram film is located.

Description

Holographic recording device for recording holographic element images by tiling a plurality of spatial light modulators {HOLOGRAM PRINTING APPARATUS FOR RECORDING OF HOLOGRAPHIC ELEMENTS IMAGES TILING MULTIPLE SPATIAL LIGHT MODULATOR}

The present invention relates to a device that records a hologram by tiling a plurality of spatial light modulators (SLM).

In order to use the digital recording method among the methods of recording a hologram on a holographic film, the hologram element image must be displayed on a spatial light modulator (SLM).

Accordingly, the resolution and size of the hologram recorded by the hologram element image may be determined depending on the size of the spatial light modulator. However, because there are restrictions on the size of the spatial light modulator, it is impossible to generate a holographic image larger than the size of the spatial light modulator due to the restrictions.

Accordingly, there is a need for a device that can increase the resolution and size of a hologram according to size constraints of the spatial light modulator.

The present invention can provide a device that increases the resolution and size of a hologram recorded on a hologram film by tiling a plurality of spatial light modulators.

A hologram recording device according to an embodiment of the present invention includes a plurality of spatial light modulators (SLMs) that output a signal beam modulated into a hologram element image; Reflectors that reflect signal beams output from each of the spatial light modulators to a tiling device; and a tiling device including total reflection prisms that tile the plurality of signal beams reflected from the reflectors by reflecting them in a direction where the hologram film is located.

The hologram recording device according to an embodiment of the present invention may further include filters that filter each of the signal beams reflected from the reflectors before each of the signal beams is incident on the total reflection prism of the tiling device.

The filters of the hologram recording device according to an embodiment of the present invention may transmit a preset area of the signal beams reflected from the reflectors and filter the remaining areas excluding the preset area.

The filters of the hologram recording device according to an embodiment of the present invention filter a preset order of a 0-order beam, a 1st-order diffraction beam, a 2nd-order diffraction beam, or a 2nd or higher order diffraction beam from the signal beam reflected from the reflectors. Except for the diffraction beam, the remaining diffraction beams can be filtered.

The total reflection prisms of the hologram recording device according to an embodiment of the present invention may correspond to each of the plurality of spatial light modulators installed at different positions.

The total reflection prisms of the hologram recording device according to an embodiment of the present invention can reflect signal beams output from each of the plurality of spatial light modulators installed at different positions and reflected by the reflectors in a direction to form a hologram. there is.

The reflectors of the hologram recording device according to an embodiment of the present invention may be total reflection prisms that reflect the signal beam output from each of the spatial light modulators and passing through the lens in the direction where the tiling device is located.

A hologram recording device according to an embodiment of the present invention includes a recording light source unit that divides a source beam output from a light source into a first output beam and a second output beam and outputs them; a reference beam generator that removes distortion of the first output beam and generates a reference beam by controlling the size and shape of the first output beam from which the distortion has been removed; an object beam generator that generates an object beam by removing distortion of the second output beam; A plurality of object beam condensers that modulate the object beam with a holographic element image and output a signal beam; and an optical combining unit that generates a hologram by optically tiling the signal beams output from each of the plurality of object beam concentrators using total reflection prisms, wherein the divided signal beams interfere with the reference beam through interference. Patterns can be formed.

The hologram recording device according to an embodiment of the present invention may further include a film transfer unit that transfers the hologram film based on the position at which the tiled signal beams are focused in the optical coupling unit.

The film transfer unit of the hologram recording device according to an embodiment of the present invention can control the distance between the hologram film and the optical coupling unit according to the focal length of the lens that converges the tiled signal beams in the optical coupling unit.

The optical coupling unit of the hologram recording device according to an embodiment of the present invention includes reflectors that reflect signal beams output from each of the object beam condensing units to a tiling device; and a tiling device including total reflection prisms that tile the plurality of signal beams reflected from the reflectors by reflecting them in a direction where the hologram film is located.

The optical coupling unit of the hologram recording device according to an embodiment of the present invention may further include filters that filter each of the signal beams reflected from the reflectors before each of the signal beams is incident on the total reflection prism of the tiling device. .

According to one embodiment of the present invention, the resolution and size of a hologram recorded on a hologram film can be increased by tiling a plurality of spatial light modulators with total reflection prisms.

1 is a diagram showing a hologram recording device according to an embodiment of the present invention.
FIG. 2 is a diagram showing an object beam condenser and an optical coupling unit included in a hologram recording device.
Figure 3 is an example of an optical coupling unit according to an embodiment of the present invention.
Figure 4 is a three-dimensional structure of an optical coupling unit according to the first embodiment of the present invention.
Figure 5 is a three-dimensional structure of an optical coupling unit according to a second embodiment of the present invention.
Figure 6 is a diagram showing a state in which an object beam condenser and an optical coupling unit are disposed on a hologram film according to an embodiment of the present invention.
Figure 7 is a three-dimensional structure of an optical coupling unit according to a third embodiment of the present invention.

Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. In the drawings, parts not related to the description are omitted in order to clearly explain the present invention.

In order to overcome the size constraints of the spatial light modulator, the present invention can generate a hologram with large resolution and size by spatially arranging and optically combining a plurality of spatial light modulators.

The resolution of one spatial light modulator is the number of horizontal pixels (M, M=1,2,3,4,?,M) and the number of vertical pixels (N, N=1,2,3,...,N). In the case of the product (M×N), the hologram recording device according to the present invention has a plurality of k, l (k=1,2,3,..,k, l= 1,2,3,.., l ) Using a spatial light modulator, a digital hologram can be implemented with a resolution and size equal to the product of the horizontal resolution (k×M) and the vertical resolution ( l ×N) (k×M× l ×N).

In addition, the hologram recording device according to the present invention maintains the same output intensity of the signal output from the spatial light modulator and transforms and arranges a right-angled prism structure that exhibits a total reflection phenomenon in order to optically position the spatial light modulator at the same position, thereby maintaining the same output intensity of the signal output from the spatial light modulator. Resolution and size can be doubled while minimizing loss of signal intensity output from the optical modulator.

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

1 is a diagram showing a hologram recording device according to an embodiment of the present invention.

Referring to FIG. 1, the hologram recording device 100 according to an embodiment of the present invention includes a recording light source unit 110, a reference beam generator 120, an object beam generator 130, and an object beam condenser 140. , may include an optical coupling unit 150, a film transfer unit 160, and a control unit 170.

The recording light source unit 110 may divide the source beam output from the light source into a first output beam and a second output beam and output them. At this time, the recording light source unit 110 may include a coherent light source such as a laser. For example, the recording light source unit 110 is red. rust. Blue (Red/Green/Blue) laser can be used as a light source. Additionally, the type of laser used by the recording light source unit 110 as a light source may be a (CW: Continuous Wave) laser.

In addition, when the optical axes of the first and second output beams output to the reference beam generator 120 and the object beam generator 130 are a single optical axis, the recording light source unit 110 uses a beam combiner. As ever. rust. The source beam output from the blue laser can be combined into a single light and then divided into a first output beam and a second output beam. And, the recording light source unit 110 is red as shown in FIG. 2. rust. The source beam output from the blue laser can be split independently.

The reference beam generator 120 may remove distortion of the first output beam divided by the recording light source unit 110. Additionally, the reference beam generator 120 may generate a reference beam by controlling the size and shape of the first output beam from which distortion has been removed.

At this time, the reference beam generator 120 controls the size of the first output beam from which distortion has been removed using at least one mirror, a wave plate, and a polarizer, or controls the size of the first output beam from which distortion has been removed using a relay lens. can do. Additionally, the reference beam generator 120 may control the shape of the first output beam from which distortion has been removed using an aperture.

The object beam generator 130 may generate an object beam that is a collimated beam from which distortion has been removed from the first output beam output by the recording light source unit 110.

At this time, the object beam generator 130 may generate an object beam by removing distortion of the first output beam using a beam expander, a spatial filter, and a micro lens array. Additionally, the object beam generator 130 may include a neutral density filter, a wave plate, and a polarizer to adjust the intensity of the generated object beam.

The object beam condensing units 140 may output a signal beam by modulating the object beam generated by the object beam generating unit 130 with the holographic element image provided by the control unit 170. Additionally, the object beam concentrators 140 can converge the signal beam and make it incident on the hologram film.

At this time, the signal beam incident on the hologram film by the object beam condenser 140 forms an interference pattern through interference with the reference beam incident on the hologram film by the reference beam generator 120, thereby forming a hologram pattern on the hologram film. can be recorded.

The object beam concentrators 140 may respectively correspond to object beams output from the object beam generator 130. Additionally, the object beam concentrators 140 may each include a spatial light modulator (SLM), a relay lens, and a condenser lens.

At this time, the object beam concentrator 140 may include one of a reflection type spatial light modulator or a transmission type spatial light modulator. When the object beam concentrator 140 includes a reflection-type spatial light modulator, the object beam condenser 140 includes a polarizing beam splitter ( PBS: Polarized Beam Splitter) may be further included.

Specifically, the spatial light modulator may display the holographic element image received from the control unit 170 on the display. At this time, the object beam incident on the spatial light modulator may be modulated and reflected according to the holographic element image displayed on the display. At this time, the signal beam, which is an object beam modulated and reflected from the display, may proceed in the direction of the hologram film. For example, the signal beam may be an object beam modulated to have the intensity of each pixel of the hologram element image.

In addition, when the object beam concentrator 140 includes a transmission-type spatial light modulator, the object beam output by the object beam generator 130 is modulated while passing through the spatial light modulator and changes into a signal beam, and the signal beam may be incident on the relay lens.

Specifically, the spatial light modulator can display the holographic element image received from the control unit 170 on a transparent display through which an object beam can pass. At this time, the object beam output by the object beam generator 130 may pass through the transparent display of the spatial light modulator and be modulated according to the holographic element image displayed on the transparent display.

Additionally, the relay lens can control the size of the signal beam, which is an object beam modulated by the spatial light modulator. At this time, the size of the signal beam may be the size of the diameter of the signal beam. For example, when recording a holographic element with a size of 1mm x 1mm on a hologram film, the size of the signal beam incident on the hologram film surface must be 1mm x 1mm. However, the size of the signal beam output from the spatial light modulator may not be 1mm x 1mm. Therefore, the relay lens can control the size of the signal beam output from the spatial light modulator according to the size of the hologram element.

At this time, the type of relay lens may be determined depending on the size of the hologram element to be recorded on the hologram film and the size of the signal beam output from the spatial light modulator.

For example, when the size of the hologram element is smaller than the size of the signal beam output from the spatial light modulator, the object beam concentrator 140 may include a relay lens that reduces the size of the signal beam. Additionally, when the size of the hologram element is larger than the size of the signal beam output from the spatial light modulator, the object beam concentrator 140 may include a relay lens that increases the size of the signal beam.

In addition, the signal beam input to the relay lens must be parallel light without distortion to prevent distortion due to size changes.

In addition, the condenser lens can receive a signal beam whose size is controlled by the relay lens, and make the input signal beam incident on the optical coupling unit 150.

The optical coupling unit 150 may be composed of a plurality of total reflection prisms corresponding to each of the plurality of object beam concentrators 140. Additionally, the optical coupling unit 150 may optically tile the signal beams incident from the plurality of object beam concentrators 140 and cause them to enter the hologram film. Specifically, the optical coupling unit 150 may use a plurality of prisms, optical lenses, and optical filters to converge signal beams output from a plurality of spatial light modulators and make them incident on the hologram film. At this time, tiling may be a technology that spatially fills signal beams output from different spatial light modulators without crossing or overlapping.

The optical coupling unit 150 tiles the signal beams incident from each of the plurality of object beam concentrators 140, thereby forming a digital hologram with high resolution and large image size, which is difficult to implement with a single spatial light modulator. .

The film transfer unit 160 may transfer the hologram film to the location where the optical coupling unit 150 is disposed. At this time, the film transfer unit 160 can transfer the hologram film within the range where the optical coupling unit 150 does not leave the divided area.

Specifically, the film transfer unit 160 can fix the hologram film and transfer the fixed hologram film to the position where the optical coupling unit 150 is placed, and includes a transfer motor in at least one axis to transfer the hologram film. can do.

At this time, since the hologram element image is two-dimensionally recorded on the hologram film, the film transfer unit 160 may generally include motors for the X and Y axes. In addition, when it is desired to control the distance between the hologram film and the optical coupling unit 150 by adjusting the height of the film transfer unit 160, the film transfer unit 160 may further include a Z-axis motor.

Additionally, the method by which the film transfer unit 160 transfers the hologram film may be one of a step method, a roll-fed method, or a scanning method.

The control unit 170 may control the operations of the recording light source unit 110, the reference beam generator 120, the object beam generator 130, the object beam condenser 140, and the film transfer unit 160.

For example, the control unit 170 may drive the recording light source unit 110 to output a second output beam and a first output beam to the reference beam generator 120 and the object beam generator 130, respectively. At this time, the control unit 170 can control the exposure amount of the object beam and the reference beam by controlling the optical shutter.

Additionally, the control unit 170 may transmit a holographic element image to the object beam concentrators 140. At this time, the object beam concentrators 140 output the holographic element image transmitted from the control unit 170 to a spatial light modulator (SLM: Spatial Light Modulator), and convert the object beam generated by the object beam generator 130 into spatial light. The object beam can be modulated by outputting it to the modulator.

Additionally, the control unit 170 may control the motor of the film transfer unit 160 to transfer the hologram film to the position of the object beam condenser 140. Additionally, the control unit 170 may additionally include control functions for controlling optical components and imaging beams.

The hologram recording device 100 can form a digital hologram image with increased resolution and size on a hologram film by tiling a plurality of spatial light modulators (SLM) in an optical manner using a total reflection prism. there is.

Specifically, the hologram recording device 100 improves optical efficiency by tiling the signal beam output from the spatial light modulator using a total reflection prism with high transmission efficiency, and performs tiling by precisely controlling the optical positions of the spatial light modulators. You can.

FIG. 2 is a diagram showing an object beam condenser and an optical coupling unit included in a hologram recording device.

The spatial light modulator (SLM) of the first object beam concentrator 210 may display holographic element images received from the control unit 170 on the LCoS 211. At this time, the first object beam incident on the LCoS 211 of the spatial light modulator (SLM) of the first object beam concentrator 210 may be modulated according to the holographic element image displayed on the LCoS 211. In addition, the spatial light modulator (SLM) of the first object beam concentrator 210 may output a first signal beam, which is the first object beam, modulated according to the holographic element image in the LCoS 211.

Next, the relay lens 212 may increase or decrease the size of the signal beam output from the spatial light modulator (SLM) according to the size of the preset hologram element.

Finally, the condenser lens 213 may cause the first signal beam, the size of which has been increased or decreased by the relay lens 212, to enter the optical coupling unit 150.

Additionally, the spatial light modulator (SLM) of the second object beam concentrator 220 may display hologram element images received from the control unit 170 on the LCoS 221. At this time, the second object beam incident on the LCoS (221) may be modulated according to the hologram element image displayed on the LCoS (221). In addition, the spatial light modulator (SLM) of the second object beam concentrator 220 may output a second signal beam, which is a second object beam modulated according to the holographic element image, in the LCoS 221.

At this time, the spatial light modulator (SLM), relay lens 222, and condenser lens 223 of the second object beam concentrator 220 are connected to the spatial light modulator (SLM) and relay lens of the first object beam condenser 210. In the same way as the lens 2212 and the condenser lens 213, the second signal beam can be controlled to enter the optical coupling unit 150.

As shown in FIG. 2, the optical coupling unit 150 is configured to receive a first signal beam and Tiling may be performed to output the second signal beam at an interval narrower than the arrangement spacing of the first object beam concentrator 210 and the second object beam condenser 220.

The specific configuration of the optical coupling unit 150 will be described in detail below with reference to FIGS. 3 to 5.

Figure 3 is an example of an optical coupling unit according to an embodiment of the present invention.

FIG. 3 is an example of the configuration of an optical combining unit that tiles the first and second signal beams incident from the first object beam concentrator 210 and the second object beam condenser 220.

The optical coupling unit 150 includes reflectors 320 and 370 that reflect signal beams output from each of the spatial light modulators in directions where different spatial light modulators are installed; The signal beams reflected from the reflectors 320 and 370 and the tiling device 340, which includes total reflection prisms that tile the plurality of signal beams reflected from the reflectors 320 and 370, respectively, by reflecting them in the direction in which the hologram film is located. This tiling device 340 may include filters 330 and 380 that filter before being incident on the total reflection prism.

The first signal beam and the second signal beam may each include an image signal including a general image and a diffraction signal according to the periodic structure of element pixels. For example, the image signal may be a 0th order beam, and the diffraction signal may be diffracted beams of different orders (diffracted 1st, 2nd, 3rd, 4th,... beam).

The first signal beam incident from the first object beam concentrator 210 may pass through the first lens 310 and enter the first reflector 320.

Additionally, the first signal beam may be total reflected at the hypotenuse of the total reflection prism, which is the first reflector 320, and may be incident on the tiling device 340. Additionally, the first signal beam incident on the tiling device 340 may be totally reflected at the hypotenuse of the first total reflection prism 341 of the tiling device 340 and may be incident on the second lens 350. And, the first signal beam incident on the second lens 350 is transmitted through the second lens 350, and is focused on a position at a distance equal to the focal distance of the second lens 350 with respect to the second lens 350. You can. At this time, the film transfer unit 160 controls the distance between the holographic film and the optical coupling unit 150 according to the focal length of the second lens 350, so that the first signal beam passing through the second lens 350 is transmitted to the holographic film. It can be made to concentrate light.

Additionally, the first filter 330 may filter the first signal beam totally reflected by the first reflector 320 before the first signal beam is incident on the tiling device 340. At this time, the first filter 330 may transmit a preset area of the first signal beam reflected from the first reflector 320 and filter the remaining areas excluding the preset area. For example, the first filter 330 may be a spatial filter that can select the order of light diffracted by the spatial light modulator of the first object beam concentrator 210 and transmit it.

Specifically, the first filter 330 selects a diffraction beam of a preset order among a 0-order beam, a 1st-order diffraction beam, a 2nd-order diffraction beam, or a 2nd or higher order diffraction beam from the signal beam reflected from the first reflector 320. The remaining diffraction beams except can be filtered.

Additionally, the first filter 330 may be spaced apart from the first lens 310 by the focal distance of the first lens 310. Specifically, the distance until the first signal beam transmitted through the first lens 310 is reflected by the first reflector 320 and the first signal beam reflected from the first reflector 320 are measured by the first filter 330. ) The position of the first filter 330 may be determined so that the sum of the distances until it passes through becomes the focal length of the first lens 310.

Also, the second signal beam incident from the second object beam condenser 220 may pass through the third lens 360 and enter the second reflector 370.

At this time, the second signal beam may be totally reflected at the hypotenuse of the total reflection prism, which is the second reflector 370, and may be incident on the tiling device 340. Additionally, the second signal beam incident on the tiling device 340 may be totally reflected at the hypotenuse of the second total reflection prism 342 of the tiling device 340 and may be incident on the second lens 350.

Additionally, the second filter 380 may filter the second signal beam totally reflected by the second reflector 370 before the second signal beam is incident on the tiling device 340. At this time, the second filter 380 may transmit a preset area of the second signal beam reflected from the second reflector 370 and filter the remaining areas excluding the preset area. For example, the second filter 380 may be a spatial filter that can select the order of light diffracted by the spatial light modulator of the second object beam concentrator 220 and transmit it.

Also, the distance until the second signal beam transmitted through the third lens 360 is reflected by the second reflector 370 and the second signal beam reflected from the second reflector 370 are measured by the second filter 380. The position of the second filter 380 may be determined so that the sum of the distances until passing through becomes the focal length of the third lens 360.

At this time, the number of pixels of the spatial light modulator of the first object beam concentrator 210 and the spatial light modulator of the second object beam concentrator 220 may be the same. Additionally, the focal lengths of the first lens 310, the second lens 350, and the third lens 360 may be the same.

Additionally, the first filter 330 and the second filter 380 may have a structure that allows beams of the same diffraction order to pass. For example, when the first filter 330 filters the remaining beams excluding the first diffracted beam, the second filter 380 may also have a structure that filters the remaining beams excluding the first diffracted beam.

Figure 4 is a three-dimensional structure of an optical coupling unit according to the first embodiment of the present invention.

As shown in FIG. 4, the optical coupling unit 150 according to the first embodiment of the present invention has a direction in which the first signal beam and the second signal beam output from the second lens 350 are directed to the optical coupling unit 150. This is an embodiment where the directions of the first signal beam and the second signal beam incident on are the same.

The spatial light modulator (SLM) of the first object beam concentrator 210 may output a first signal beam obtained by modulating the first object beam according to the first hologram element image 410. At this time, the first signal beam may pass through the first lens 310, be reflected by the first reflector 320, and be filtered by the first filter 330, as shown in FIG. 4.

Also, the first signal beam filtered by the first filter 330 may be reflected from the first total reflection prism 341 of the tiling device 340 and may be incident on the second lens 350.

Additionally, the spatial light modulator (SLM) of the second object beam concentrator 220 may output a second signal beam obtained by modulating the second object beam according to the second hologram element image 420. At this time, the second signal beam may pass through the third lens 360, be reflected by the second reflector 370, and be filtered by the second filter 380, as shown in FIG. 4.

Also, the second signal beam filtered by the second filter 380 may be reflected from the second total reflection prism 342 of the tiling device 340 and may be incident on the second lens 350.

At this time, the dotted line shown in FIG. 4 may represent the central progress line (primary ray) of the first signal beam and the second signal beam.

In addition, the total reflection prism of the first reflector 320, the total reflection prism of the second reflector 370, the first total reflection prism 341, and the second total reflection prism 342 are in the form of a right-angled isosceles triangular pillar, as shown in FIG. 4. It can be. That is, the lower and upper surfaces of the first reflector 320, the second reflector 370, the first total reflection prism 341, and the second total reflection prism 342 may have an isosceles right angle shape, and the side surfaces may have a square shape.

Figure 5 is a three-dimensional structure of an optical coupling unit according to a second embodiment of the present invention.

As shown in FIG. 5, the optical coupling unit 150 according to the second embodiment of the present invention has a direction in which the first signal beam and the second signal beam output from the second lens 520 are directed to the optical coupling unit 150. This is an embodiment where the directions of the first signal beam and the second signal beam incident on are different.

The spatial light modulator (SLM) of the first object beam concentrator 210 may output a first signal beam obtained by modulating the first object beam according to the first hologram element image 501. At this time, the first signal beam may pass through the first lens 310, be reflected by the first reflector 320, and be filtered by the first filter 330, as shown in FIG. 5.

Also, the first signal beam filtered by the first filter 330 may be reflected from the first total reflection prism 511 of the tiling device 510 and may be incident on the second lens 520.

Additionally, the spatial light modulator (SLM) of the second object beam concentrator 220 may output a second signal beam obtained by modulating the second object beam according to the second hologram element image 502. At this time, the second signal beam may pass through the third lens 360, be reflected by the second reflector 370, and be filtered by the second filter 380, as shown in FIG. 5.

Also, the second signal beam filtered by the second filter 380 may be reflected from the second total reflection prism 512 of the tiling device 510 and may be incident on the second lens 520.

At this time, as shown in FIG. 5, the first total reflection prism 511 has a structure that reflects the first signal beam incident in the It may be a structure that reflects the second signal beam in the Z-axis direction. And, the first signal beam reflected from the first total reflection prism 511 and the second signal beam reflected from the second total reflection prism 512 are located at the positions of the first total reflection prism 511 and the second total reflection prism 512. They are tiled along the Z-axis, and the second lens 520 can form a hologram in the Z-axis direction by focusing the tiled first and second signal beams in the Z-axis direction.

That is, the tiling device 510 tiles the first signal beam output from the first object beam concentrator 210 located in the Y-axis direction and the second signal beam output from the second object beam condenser 220. By reflecting in the Z-axis direction, a hologram can be formed in a direction different from the direction in which the first signal beam output from the first object beam concentrator 210 travels.

Additionally, the angle at which the tiling device 510 reflects the first signal beam and the second signal beam may be set differently depending on the embodiment. For example, in FIG. 5, the tiling device 510 reflects the first and second signal beams incident in the horizontal direction in the vertical direction. However, the tiling device 510 rotates the first and second signal beams incident from the horizontal direction at 45 degrees based on the vertical direction according to the installation angles of the first total reflection prism 511 and the second total reflection prism 512. It can also be reflected at one of a variety of angles. At this time, the second lens 520 coupled to the tiling device 510 forms a hologram by concentrating the first and second signal beams reflected from the tiling device 510 in the direction reflected by the tiling device 510. can do.

That is, the hologram recording device 100 according to an embodiment of the present invention changes the installation angle of the first total reflection prism 511 and the second total reflection prism 512 of the tiling device 510, so that the object beam condenser ( 140), the angle at which the hologram is formed can be changed without changing the position and angle.

Figure 6 is a diagram showing a state in which an object beam condenser and an optical coupling unit are disposed on a hologram film according to an embodiment of the present invention.

As shown in FIG. 6, the hologram recording device 100 according to an embodiment of the present invention includes a first object beam condenser 610, a second object beam condenser 620, and a third object beam condenser 630. , the optical coupling unit 650 tiles the signal beams modulated by the fourth object beam concentrator 640 according to each hologram element image and focuses them on the hologram film 600, thereby generating a hologram.

At this time, the hologram generated on the hologram film 600 includes the first object beam condenser 610, the second object beam condenser 620, the third object beam condenser 630, and the fourth object beam condenser 640. ) can have 4 times the size or 4 times the resolution of the holograms that can be generated, respectively.

The specific configuration of the optical coupling unit 650 will be described in detail below with reference to FIG. 7.

Figure 7 is a three-dimensional structure of an optical coupling unit according to a third embodiment of the present invention.

The optical coupling unit 150 according to the third embodiment of the present invention is an embodiment in which four signal beams incident from four object beam concentrators are tiled and output, as shown in FIG. 7 .

The spatial light modulator (SLM) of the first object beam concentrator 610 may output a first signal beam obtained by modulating the first object beam according to the first hologram element image 701. At this time, the first signal beam may pass through the first lens 711, be reflected by the first reflector 712, and be filtered by the first filter 713, as shown in FIG. 7. Additionally, the first signal beam filtered by the first filter 713 may be reflected from the first total reflection prism 751 of the tiling device 750 and may be incident on the second lens 760.

Additionally, the spatial light modulator (SLM) of the second object beam concentrator 620 may output a second signal beam obtained by modulating the second object beam according to the second hologram element image 702. At this time, the second signal beam may pass through the second lens 721, be reflected by the second reflector 722, and be filtered by the second filter 723, as shown in FIG. 7. Additionally, the second signal beam filtered by the second filter 723 may be reflected from the second total reflection prism 752 of the tiling device 750 and may be incident on the second lens 760.

Additionally, the spatial light modulator (SLM) of the third object beam concentrator 630 may output a third signal beam obtained by modulating the third object beam according to the third hologram element image 703. At this time, the third signal beam may pass through the third lens 731, be reflected by the third reflector 732, and be filtered by the third filter 733, as shown in FIG. 7.

Additionally, the third signal beam filtered by the third filter 733 may be reflected from the third total reflection prism 753 of the tiling device 750 and may be incident on the second lens 760.

Additionally, the spatial light modulator (SLM) of the fourth object beam concentrator 640 may output a fourth signal beam obtained by modulating the fourth object beam according to the fourth hologram element image 704. At this time, the fourth signal beam may pass through the fourth lens 741, be reflected by the fourth reflector 742, and be filtered by the fourth filter 743, as shown in FIG. 7.

Additionally, the fourth signal beam filtered by the fourth filter 743 may be reflected from the fourth total reflection prism 754 of the tiling device 750 and may be incident on the second lens 760.

At this time, the first total reflection prism 511, the second total reflection prism 521, the second total reflection prism 531, and the fourth total reflection prism 541 each receive the light incident from the X-axis direction as shown in FIG. 7. It may be a structure that reflects the first signal beam, the second signal beam, the third signal beam, and the fourth signal beam in the Z-axis direction. And, the first signal beam, the second signal beam, and the third signal reflected from the first total reflection prism 511, the second total reflection prism 521, the second total reflection prism 531, and the fourth total reflection prism 541. The beam and the fourth signal beam are tiled according to the positions of the first total reflection prism 511, the second total reflection prism 521, the second total reflection prism 531, and the fourth total reflection prism 541, and the second lens 520 may form a hologram in the Z-axis direction by condensing the tiled first, second, third, and fourth signal beams in the Z-axis direction.

That is, the optical coupling unit 150 according to the third embodiment of the present invention includes a first object beam concentrator 610, a second object beam condenser 620, and a third object beam condenser, as shown in FIG. 7. By tiling and outputting the first signal beam, second signal beam, third signal beam, and fourth signal beam incident from the light unit 630 and the fourth object beam concentrator 640, respectively, the first object beam concentrator 640 (610), the second object beam condenser 620, the third object beam condenser 630, and the fourth object beam condenser 640 each have four times the size or four times the resolution of the hologram that can be generated. Branches can form holograms.

The present invention can form a digital hologram with increased resolution and size on a hologram film by tiling a plurality of spatial light modulators (SLM) using an optical method using a total reflection prism.

As described above, although the present invention has been described with reference to limited embodiments and drawings, the present invention is not limited to the above embodiments, and various modifications and variations can be made from these descriptions by those skilled in the art. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the claims and equivalents thereof as well as the claims described later.

100: Hologram recording device
110: Recording light source unit
120: Reference beam generation unit
130: Object beam generation unit
140: object beam concentrator
150: Optical coupling part
160: Film transfer unit
170: Control unit

Claims (16)

A plurality of spatial light modulators (SLMs) that output a signal beam modulated into a holographic element image;
Reflectors that reflect signal beams output from each of the spatial light modulators to a tiling device;
Filters that filter each of the signal beams reflected from the reflectors before each of the signal beams is incident on the total reflection prism of the tiling device; and
A tiling device including total reflection prisms that tile a plurality of signal beams reflected from the reflectors by reflecting them in the direction where the hologram film is located.
Including,
The plurality of spatial light modulators,
A spatial light modulator (SLM) of the first object beam concentrator that outputs a first signal beam modulating the first object beam according to the first holographic element image, and a spatial light modulator (SLM) that modulates the second object beam according to the second holographic element image. 2. A spatial light modulator (SLM) of the second object beam concentrator that outputs a signal beam, and a spatial light modulator (SLM) of the third object beam condenser that outputs a third signal beam modulating the third object beam according to the third hologram element image. It includes a modulator (SLM) and a spatial light modulator (SLM) of the fourth object beam concentrator that outputs a fourth signal beam modulating the fourth object beam according to the fourth hologram element image,
The reflectors are:
A first reflector that reflects the first signal beam that has passed through the first lens to the first filter, a second reflector that reflects the second signal beam that has passed through the second lens to the second filter, and a third reflector that has passed through the third lens. It includes a third reflector that reflects the signal beam to the third filter, and a fourth reflector that reflects the fourth signal beam that has transmitted through the fourth lens to the fourth filter,
The filters are:
A first filter filters the first signal beam and transmits it to the first total reflection prism of the tiling device, a second filter filters the second signal beam and transmits it to the second total reflection prism of the tiling device, and filters the third signal beam. a third filter that filters the fourth signal beam and transmits it to the third total reflection prism of the tiling device, and a fourth filter that filters the fourth signal beam and transmits it to the fourth total reflection prism of the tiling device.
Including,
The tiling machine,
A first total reflection prism that reflects the first signal beam incident from the X-axis direction in the Z-axis direction, a second total reflection prism that reflects the second signal beam incident from the A third total reflection prism that reflects the third signal beam in the Z-axis direction, and a fourth total reflection prism that reflects the fourth signal beam incident in the X-axis direction in the Z-axis direction.
Includes,
The tiling is,
A hologram recording device that spatially fills signal beams output from different spatial light modulators without crossing or overlapping them. delete According to paragraph 1,
The filters are:
A hologram recording device that transmits a preset area of the signal beams reflected from the reflectors and filters the remaining area except for the preset area. According to paragraph 1,
The filters are:
A hologram recording device that filters the remaining diffraction beams excluding the diffraction beam of a preset order among the zero-order beam, first-order diffraction beam, second-order diffraction beam, or second or higher order diffraction beam from the signal beam reflected from the reflectors. According to paragraph 1,
The total reflection prisms are,
A hologram recording device corresponding to each of the plurality of spatial light modulators installed at different locations. According to paragraph 1,
The total reflection prisms are,
A hologram recording device that reflects signal beams output from each of the plurality of spatial light modulators installed at different positions and reflected by the reflectors in a direction to form a hologram. According to paragraph 1,
The reflectors are:
A hologram recording device that is a total reflection prism that reflects the signal beam output from each of the spatial light modulators and passing through the lens in the direction where the tiling device is located. Object beam generators that generate object beams;
a plurality of object beam concentrators that modulate the object beam with a holographic element image and output a signal beam; and
An optical combining unit that generates a hologram by optically tiling the signal beams output from each of the plurality of object beam concentrators using total reflection prisms.
Including,
The optical coupling unit,
a plurality of spatial light modulators that output a signal beam modulated into a holographic element image;
Reflectors that reflect signal beams output from each of the object beam concentrators to a tiling device;
Filters that filter each of the signal beams reflected from the reflectors before each of the signal beams is incident on the total reflection prism of the tiling device; and
A tiling device including total reflection prisms that tile a plurality of signal beams reflected from the reflectors by reflecting them in the direction where the hologram film is located.
Includes,
The plurality of spatial light modulators,
A spatial light modulator (SLM) of the first object beam concentrator that outputs a first signal beam modulating the first object beam according to the first holographic element image, and a spatial light modulator (SLM) that modulates the second object beam according to the second holographic element image. 2. A spatial light modulator (SLM) of the second object beam concentrator that outputs a signal beam, and a spatial light modulator (SLM) of the third object beam condenser that outputs a third signal beam modulating the third object beam according to the third hologram element image. It includes a modulator (SLM) and a spatial light modulator (SLM) of the fourth object beam concentrator that outputs a fourth signal beam modulating the fourth object beam according to the fourth hologram element image,
The reflectors are:
A first reflector that reflects the first signal beam that has passed through the first lens to the first filter, a second reflector that reflects the second signal beam that has passed through the second lens to the second filter, and a third reflector that has passed through the third lens. It includes a third reflector that reflects the signal beam to the third filter, and a fourth reflector that reflects the fourth signal beam that has transmitted through the fourth lens to the fourth filter,
The filters are:
A first filter filters the first signal beam and transmits it to the first total reflection prism of the tiling device, a second filter filters the second signal beam and transmits it to the second total reflection prism of the tiling device, and filters the third signal beam. a third filter that filters the fourth signal beam and transmits it to the third total reflection prism of the tiling device, and a fourth filter that filters the fourth signal beam and transmits it to the fourth total reflection prism of the tiling device.
Including,
The tiling machine,
A first total reflection prism that reflects the first signal beam incident from the X-axis direction in the Z-axis direction, a second total reflection prism that reflects the second signal beam incident from the A third total reflection prism that reflects the third signal beam in the Z-axis direction, and a fourth total reflection prism that reflects the fourth signal beam incident in the X-axis direction in the Z-axis direction.
Includes,
The tiling is,
A hologram recording device that spatially fills signal beams output from different spatial light modulators without crossing or overlapping. According to clause 8,
A film transfer unit that transfers a hologram film based on the position where the tiled signal beams are focused in the optical coupling unit.
A hologram recording device further comprising:


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