Exposure device

Abstract

The utility model discloses an exposure device which comprises a frame body, a light source, an adjusting assembly, a first dimming piece, a second dimming piece, a holographic plate and a lens assembly, and the light source is arranged on the frame body; the adjusting assembly is provided with an incident end opposite to the light source, and the adjusting assembly is further provided with a light splitting structure; the adjusting assembly is provided with a first emergent end and a second emergent end; the lens assembly is arranged in the light beam emitting direction of the first dimming piece or the second dimming piece. Through the design, one of the two beams of light participating in exposure can be converted into non-parallel light through the lens assembly, and after the two beams of light interfere with each other to expose the holographic dry plate, the coupling-out grating of which the coupling-out light is non-parallel light and the optical waveguide sheet adopting the coupling-out grating can be manufactured. The light enters the human eyes in a divergent state, and according to the visual imaging principle of the human eyes, the visual effect of close-range display can be formed, so that the optical waveguide sheet adopting the coupling-out grating has the function of close-range display.

Description

TECHNICAL FIELD

[0001] The utility model relates to holographic grating technical field especially relates to an exposure device. BACKGROUND

[0002] The existing exposure device is used for making the coupling-out grating of the optical waveguide sheet, and two parallel lights (the light wave front is plane wave) are used for interference to expose the exposure material to make, the exit light of the coupling-out grating of the optical waveguide sheet made is plane light, the display distance is infinite, and the optical waveguide sheet made cannot be applied to the function of near-distance display. SUMMARY

[0003] To solve the problem that the coupling-out light of the coupling-out grating of the optical waveguide sheet made by the existing exposure device is parallel light and cannot be applied to the function of near-distance display, the utility model provides an exposure device.

[0004] The exposure device provided by the utility model relates to an exposure device, which comprises a frame body, a light source, an adjusting assembly, a first light adjusting piece, a second light adjusting piece, a holographic plate and a lens assembly, the light source is arranged on the frame body, and the light source is used for emitting laser; the adjusting assembly is provided with an incident end arranged opposite to the light source, the adjusting assembly is further provided with a light splitting structure, the light splitting structure is used for splitting the laser emitted by the incident end into a first light beam and a second light beam, the adjusting assembly is provided with a first exit end for the first light beam and a second exit end for the second light beam; the first light adjusting piece and the second light adjusting piece are arranged in the emission directions of the first light beam and the second light beam respectively, the first light adjusting piece and the second light adjusting piece are used for changing the directions of the first light beam and the second light beam respectively so that the first light beam and the second light beam are emitted to the holographic plate; the lens assembly is arranged in the light beam emission direction of the first light adjusting piece or the second light adjusting piece; wherein the first light beam or the second light beam can be converted from the parallel light state to the non-parallel light state by the lens assembly and emitted to the holographic plate.

[0005] In some embodiments, the first light beam and the second light beam are emitted to the holographic plate from the same side of the holographic plate and interfere with each other.

[0006] In some embodiments, the first light beam and the second light beam are emitted to the holographic plate from different sides of the holographic plate and interfere with each other.

[0007] In some embodiments, the holographic plate is provided with a light guide prism, and a refractive index matching liquid is filled between the light guide prism and the holographic plate.

[0008] In some embodiments, the holographic plate is disposed outside one focal length of the lens assembly.

[0009] In some embodiments, the adjusting assembly comprises a beam expander, a collimator and a beam splitter, which are sequentially disposed along the light path.

[0010] In some embodiments, a deflector is disposed between the first light adjusting member, the second light adjusting member and the frame body to change the incident angle of the first light beam and the second light beam.

[0011] In some embodiments, the exposure device further comprises a first moving mechanism for adjusting the distance between the holographic plate and the lens assembly, the first moving mechanism is disposed on the frame body, and the holographic plate is disposed at the moving end of the first moving mechanism.

[0012] In some embodiments, the exposure device further comprises a second moving mechanism, the second moving mechanism is disposed on the frame body, the first light adjusting member and the second light adjusting member are connected to the moving end of the second moving mechanism, and the first light adjusting member and the second light adjusting member can move to change the distance with the holographic plate.

[0013] In some embodiments, the lens assembly is provided with a focal length adjusting structure.

[0014] Compared with the prior art, the exposure device has the beneficial effects that one of the two light beams participating in exposure is parallel light, and the other is non-parallel light (divergent light), the interference fringes formed after interference can expose the holographic plate, and then a coupling-out grating with non-parallel light (divergent light) as the coupling-out light (which can be understood as the emitted light) can be obtained, the optical waveguide sheet using the above coupling-out grating has non-parallel light (divergent light) as the coupling-out light, the light enters the human eye in a divergent state, according to the visual imaging principle of the human eye, the visual effect of near-distance display is formed, and the optical waveguide sheet using the above coupling-out grating has the function of near-distance display. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is the structure and optical path diagram of one embodiment of the application;

[0016] Figure 2 is the structure and optical path diagram of another embodiment of the application.

[0017] 100, light source; 200, adjusting assembly; 21, beam expander; 22, collimator; 23, beam splitter; 300, first light adjusting member; 400, second light adjusting member; 500, holographic plate; 01, light guide prism; 02, refractive index matching liquid; 600, lens assembly. DETAILED DESCRIPTION

[0018] In order to make the technical scheme of the utility model better understood by those skilled in the art, the utility model will be described in detail below in conjunction with the drawings, and the description in this part is only exemplary and explanatory, and should not have any limiting effect on the protection scope of the utility model.

[0019] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0020] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0021] In addition, the terms "horizontal", "vertical", "overhang" and the like do not mean that the component must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs. The terms used in the specification of the utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the utility model.

[0023] The utility model will be described in further detail below in conjunction with the drawings.

[0024] As Figure 1The exposure device shown comprises a frame, a light source 100, an adjusting assembly 200, a first light adjusting piece 300, a second light adjusting piece 400, a holographic plate 500 and a lens assembly 600. The light source 100 is arranged on the frame and is used to emit laser light. The adjusting assembly 200 is arranged opposite the light source 100 and is provided with an incident end. The adjusting assembly 200 is also provided with a light splitting structure. The light splitting structure uses the principles of reflection and refraction of light to split a beam of laser light incident from the incident end into two beams of laser light, i.e. a first light beam and a second light beam, through reflection and refraction by a plurality of lenses. The adjusting assembly 200 is provided with a first exit end for the first light beam to exit and a second exit end for the second light beam to exit. The first light adjusting piece 300 and the second light adjusting piece 400 are arranged in the directions of exit of the first light beam and the second light beam respectively. The first light adjusting piece 300 and the second light adjusting piece 400 are used to change the directions of the first light beam and the second light beam respectively so that the first light beam and the second light beam are directed towards the holographic plate 500. The lens assembly 600 is arranged in the direction of exit of the light beam of the first light adjusting piece 300 or the second light adjusting piece 400. The first light beam or the second light beam can be converted from a parallel light (the wavefront of the light rays is a plane wave) to a non-parallel light (divergent light) by the lens assembly 600 and directed towards the holographic plate 500. Through the above design, two beams of light rays participating in exposure are one parallel light and the other non-parallel light (divergent light). After mutual interference, the interference fringes formed are used to expose the holographic plate 500. Then a coupling-out grating with non-parallel light (divergent light) as the coupling-out light rays (which can be understood as the exit light rays) can be obtained. The optical waveguide sheet using the above coupling-out grating has non-parallel light (divergent light) as the coupling-out light rays. According to the principle of visual imaging of the human eye, the light rays enter the human eye in a divergent state to form a near-distance display visual effect (if the light rays enter the human eye in a parallel light, the display distance of the image produced in vision is at infinity). Therefore, the optical waveguide sheet using the above coupling-out grating has the function of near-distance display.

[0025] For ease of understanding, it needs to be explained that if the image is to be formed in a near-distance display effect in the visual effect of the human eye, the light rays of the image need to enter the human eye in a divergent state. If the optical waveguide sheet uses a coupling-out grating made by a traditional exposure device, the coupling-out light rays (which can be understood as the exit light rays) are parallel light. After entering the human eye, the display distance of the image formed is at infinity. Therefore, the optical waveguide sheet using the traditional coupling-out grating does not have the function of near-distance display. The exposure device proposed in the present application can make a coupling-out grating with non-parallel light as the coupling-out light rays. After the optical waveguide sheet uses the coupling-out grating with non-parallel light as the coupling-out light rays, the light rays of the display image can enter the human eye in a divergent state to form a near-distance display visual effect. Therefore, it can be applied to the function of near-distance display.

[0026] The technical details of each component will be introduced one by one below.

[0027] In some embodiments, as shown in FIG. 1, the first light beam and the second light beam are incident on the holographic plate 500 from the same side of the holographic plate 500 and interfere with each other. The first light beam and the second light beam can be used to make a transmission type holographic grating. Figure 2

[0028] In other embodiments, as shown in FIG. 2, the first light beam and the second light beam are incident on the holographic plate 500 from different sides of the holographic plate 500 and interfere with each other. The first light beam and the second light beam can be used to make a reflection type holographic grating. Figure 1

[0029] In some embodiments, the holographic plate 500 is provided with a light guide prism 01, and a refractive index matching liquid 02 is filled between the light guide prism 01 and the holographic plate 500. In some applications, such as in optical waveguide display, the angle of the first light beam or the second light beam inside the holographic plate 500 needs to be a total reflection angle. However, when the light directly enters the holographic plate 500 from the air, the refractive angle of the light inside the holographic plate 500 cannot reach the total reflection angle. The light guide prism 01 can refract the light, and under the action of the refractive index matching liquid 02, the refractive index of the light guide prism 01 and the holographic plate 500 is consistent to form a whole. After the first light beam or the second light beam is refracted by the light guide prism 01, it enters the inside of the holographic plate 500, and the light can reach the total reflection angle inside the holographic plate 500. When the holographic grating made in this way is applied to optical waveguide display, the light can propagate by total reflection in the optical waveguide.

[0030] In some embodiments, the holographic plate 500 is arranged outside one focal length of a lens assembly 600.

[0031] As shown in FIG. 3, the lens assembly 600 is a convex lens that can converge light. The light outside one focal length of the lens assembly 600 is in a divergent state, and the light inside one focal length of the lens assembly 600 is in a convergent state. It can be understood that in the application of optical waveguide display, if a light waveguide sheet is needed to be made to have a divergent state of the coupled-out light, the non-parallel light beams incident on the holographic plate 500 need to be in a divergent state for interference, and at the same time, the light needs to have a focal point. Therefore, the holographic plate needs to be arranged outside one focal length of the lens assembly. Figure 1 In other embodiments, the lens assembly 600 can also be a concave lens, and parallel light passing through the lens assembly 600 will be converted into a divergent state. Through the above design, the first light beam or the second light beam will directly become divergent light after being refracted by the concave lens, so that the position of the holographic plate 500 does not need to be limited outside one focal length of the lens assembly 600.

[0032] In some embodiments, as shown in FIG. 4, the first light beam and the second light beam are incident on the holographic plate 500 from the same side of the holographic plate 500 and interfere with each other. The first light beam and the second light beam can be used to make a transmission type holographic grating.

[0033] Figure 1 ,​​​Figure 2 As shown, the adjusting assembly 200 includes a beam expander 21, a collimator 22 and a beam splitter 23, which are sequentially arranged along the light path. The beam expander 21 is configured to diverge and then converge the laser beam by using a plurality of lenses, so as to increase the cross-sectional area of the laser beam; the collimator 22 is configured to adjust the light beam to ensure that the outgoing light beam is parallel light; and the beam splitter 23 is configured to split the light beam processed by the beam expander 21 and the collimator 22 into a first light beam and a second light beam and emit the first light beam and the second light beam from different parts of the beam splitter 23 at different angles according to the principle of reflection and transmission of light.

[0034] In actual application, the laser beam emitted by the light source 100 is too thin to be directly applied to the interference exposure operation, and thus the beam expander 21 is required to diverge the light beam by using a concave lens and then converge the diverged laser beam by using a convex lens with the same focal length. In this way, the laser beam can be expanded. Then, the collimator 22 is used to process the light beam to ensure that the light beam entering the beam splitter 23 is parallel light, thereby improving the quality of the holographic grating manufactured by the exposure device.

[0035] In some embodiments, as shown in Figure 1 , Figure 2 The first light adjusting member 300 and the second light adjusting member 400 are provided with a deflection member for changing the incident angle of the first light beam and the second light beam. The deflection member includes a fixed part for being fixed to the frame and a rotating part for being connected to the first light adjusting member 300 or the second light adjusting member 400. The rotating part can rotate relative to the fixed part, so that the first light adjusting member 300 and the second light adjusting member 400 can be deflected to change the incident angle of the first light beam and the second light beam, thereby changing the outgoing direction of the first light beam and the second light beam. In actual application, the first light adjusting member 300 and the second light adjusting member 400 can be deflected to make the first light beam and the second light beam irradiate the holographic plate 500, and the adjusting process is convenient and fast.

[0036] In some embodiments, the exposure device further includes a first moving mechanism for adjusting the distance between the holographic plate 500 and the lens assembly 600. The first moving mechanism is arranged on the frame, and the holographic plate 500 is arranged on the moving end of the first moving mechanism.

[0037] Specifically, the first moving mechanism comprises a sliding rail and a sliding block, the sliding block is in sliding connection with the sliding rail and can slide along the sliding rail, the holographic plate 500 is connected with the sliding block, and the sliding rail is fixed on the frame body, through the above design, the holographic plate 500 can be moved relative to the lens assembly 600 by the first moving mechanism to change the distance between the holographic plate 500 and the focal length of the lens assembly 600, the convergence points of the out-coupled light rays of the out-coupled grating obtained are different when the distance is different, and correspondingly, the display distance of the optical waveguide sheet using the out-coupled grating with different convergence points of the out-coupled light rays is also different.

[0038] In some embodiments, as shown in Figure 1 、 Figure 2 The exposure device provided by the application comprises a second moving mechanism, the second moving mechanism is arranged on the frame body, the first light adjusting piece 300 and the second light adjusting piece 400 are connected with the moving end of the second moving mechanism, the first light adjusting piece 300 and the second light adjusting piece 400 can be moved by the second moving mechanism to change the distance between the first light adjusting piece 300 and the second light adjusting piece 400 and the holographic plate 500, and then the positions of the first light adjusting piece 300 and the second light adjusting piece 400 are adjusted to make the first light beam and the second light beam accurately irradiate the holographic plate 500.

[0039] It can be understood that the second moving mechanism can be the same mechanism as the first moving mechanism, and of course, the second moving mechanism can also be a different mechanism from the first moving mechanism.

[0040] In some embodiments, as shown in Figure 1 、 Figure 2 The lens assembly 600 is provided with a focal length adjusting structure. Specifically, the lens assembly 600 has a plurality of lenses, and the focal length of the lens assembly 600 can be changed by adjusting the distance between the plurality of lenses, through the above mode, the distance between the holographic plate 500 and the focal point of the lens assembly 600 can be changed, so that a plurality of out-coupled gratings with different convergence points of out-coupled light rays can be made, and picture display of different distances can be realized.

[0041] In the description of the present application, it should be further explained that, unless otherwise explicitly specified and limited, the terms “arrangement”, “installation”, “connection”, “connection” should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected, it can be mechanical connection, or electrical connection, it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is not intended to exclude myriad other embodiments of the present application that other inventors can develop based on the same general inventive concepts embodied by the described embodiments. That is, although the present application is described in terms of particular embodiments and implementations, it is to be understood that the terminology used is for the purpose of descriptive clarity and that it is intended to be limited only by the words recited in the appended claims. The scope of the present application shall be limited only by the claims.

[0043] While the embodiments of the present application have been illustrated and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the application, which is defined by the appended claims and their equivalents.

Claims

1. An exposure apparatus characterized by comprising: include: frame; A light source (100), the light source (100) being disposed on the frame and configured to emit laser light; An adjusting component (200), the adjusting component (200) being provided with an incident end arranged opposite to the light source (100), the adjusting component (200) being further provided with a light splitting structure, the light splitting structure being used to split the laser light incident from the incident end into a first light beam and a second light beam, the adjusting component (200) being provided with a first exit end for emitting the first light beam and a second exit end for emitting the second light beam; A first light modulating element (300), a second light modulating element (400) and a holographic dry plate (500), wherein the first light modulating element (300) and the second light modulating element (400) are respectively arranged in the emission directions of the first light beam and the second light beam, and the first light modulating element (300) and the second light modulating element (400) are respectively used to change the directions of the first light beam and the second light beam so that the first light beam and the second light beam are emitted toward the holographic dry plate (500); a lens assembly (600), the lens assembly (600) being arranged in a light beam emission direction of the first light modulating element (300) or the second light modulating element (400); The first light beam or the second light beam can be transformed from a parallel light state to a non-parallel light state after passing through the lens assembly (600) and emitted toward the holographic dry plate (500).

2. The exposure apparatus according to claim 1, wherein The first light beam and the second light beam are emitted from the same side of the holographic dry plate (500) toward the holographic dry plate (500) and interfere with each other.

3. The exposure apparatus according to claim 1, wherein The first light beam and the second light beam are emitted from different sides of the holographic dry plate (500) toward the holographic dry plate (500) and interfere with each other.

4. The exposure apparatus according to claim 1, wherein The holographic dry plate (500) is provided with a light-guiding prism (01), and a refractive index matching liquid (02) is filled between the light-guiding prism (01) and the holographic dry plate (500).

5. The exposure apparatus according to claim 1, wherein The holographic dry plate (500) is arranged outside one focal length of the lens assembly (600).

6. The exposure apparatus according to claim 1, wherein The adjustment component (200) comprises a beam expander (21), a collimator (22) and a beam splitter (23), wherein the beam expander (21), the collimator (22) and the beam splitter (23) are sequentially arranged along the optical path.

7. The exposure apparatus according to any one of claims 1, wherein A deflection element is provided between the first light modulator (300) and the second light modulator (400) and the frame to change the incident angles of the first light beam and the second light beam.

8. The exposure apparatus according to claim 1, wherein The exposure device further comprises a first moving mechanism for adjusting the distance between the holographic dry plate (500) and the lens assembly (600); the first moving mechanism is arranged on the frame; and the holographic dry plate (500) is arranged at a moving end of the first moving mechanism.

9. The exposure apparatus according to one of claims 1, wherein The exposure device further comprises a second moving mechanism arranged on the frame body, and the first light adjusting piece (300) and the second light adjusting piece (400) are connected with a moving end of the second moving mechanism, and the first light adjusting piece (300) and the second light adjusting piece (400) can move to change the distance from the holographic plate (500).

10. The exposure apparatus according to one of claims 1, wherein The lens assembly (600) is provided with a focal length adjusting structure.

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