Holographic image sheet, holographic image recording method and reconstruction method
阅读说明:本技术 全像影像片体、全像影像记录方法与重建方法 (Holographic image sheet, holographic image recording method and reconstruction method ) 是由 林志雄 张治杰 于 2018-09-10 设计创作,主要内容包括:本发明公开了一种全像影像片体、全像影像记录方法与重建方法,其中该全像影像记录方法包括预备步骤、照射步骤及记录步骤。其中预备步骤包括叠置全像底片于透明基板上。照射步骤包括发出物光与参考光,参考光照射进入透明基板内并于透明基板的厚度内进行多次全反射以形成内部全反射光。记录步骤包括内部全反射光与物光彼此干涉产生一全像影像干涉纹路并被感光记录于全像底片上。(The invention discloses a holographic image sheet, a holographic image recording method and a reconstruction method, wherein the holographic image recording method comprises a preparation step, an irradiation step and a recording step. Wherein the preliminary step includes stacking the full image negative on the transparent substrate. The irradiating step includes emitting object light and reference light, and the reference light irradiates into the transparent substrate and is totally reflected for multiple times in the thickness of the transparent substrate to form internal total reflection light. The recording step includes that the internal total reflection light and the object light interfere with each other to generate a total image interference pattern and are recorded on the total image negative film in a photosensitive mode.)
1. A method for recording a holographic image, comprising:
the preparation method comprises the following steps: superposing a full-image negative on a transparent substrate, wherein the transparent substrate comprises a first surface, a second surface and at least one light incident area, the first surface and the second surface are separated by a certain thickness, and the full-image negative is superposed on the first surface or the second surface;
an irradiation step: emitting object light and at least one reference light, wherein the object light irradiates the first surface of the transparent substrate, and the at least one light incoming area provides the at least one reference light to irradiate into the transparent substrate and perform total reflection for multiple times in the thickness to form internal total reflection light; and
a recording step: the internal total reflection light and the object light interfere with each other to generate a total image interference pattern, and the total image interference pattern is recorded on the total image film by light sensing.
2. The method of claim 1, wherein the transparent substrate in the preliminary step further comprises a side surface connecting the first surface and the second surface, the at least one light incident region being disposed on the side surface, the first surface, or the second surface.
3. The method according to claim 1, wherein the object light and the at least one reference light in the illuminating step are coherent with each other.
4. The method according to claim 3, wherein the object light and the at least one reference light in the illuminating step are generated by illuminating a spectroscope with light emitted from a light emitting unit.
5. The method according to claim 1, wherein the thickness of the transparent substrate is equal to or greater than twice the wavelength of the reference light.
6. A hologram sheet comprising a hologram layer on which the hologram interference pattern on the hologram negative film manufactured by the hologram recording method according to any one of claims 1 to 5 is recorded.
7. A method for reconstructing a holographic image, comprising:
a pretreatment step: preparing a holographic image sheet body, wherein the holographic image sheet body comprises a euphotic layer and a holographic image layer, the euphotic layer comprises a first surface, a second surface and an incidence area, a height is arranged between the first surface and the second surface, and the holographic image layer is stacked on the first surface and recorded with holographic image interference grains;
a reconstruction step: emitting a reconstruction light into the light transmission layer from the incident region, and totally reflecting the reconstruction light in the height for multiple times to form an internal total reflection light; and
an imaging step: the internal total reflection light irradiates the holographic image interference pattern to form an image so as to form a holographic image.
8. The method of claim 7, wherein the transparent layer in the preprocessing step further comprises a side edge surface connecting the first surface and the outer periphery of the second surface, and the incident region is disposed on the side edge surface, the first surface or the second surface.
9. The method of claim 7, wherein the reconstruction light is emitted from a light-emitting unit adjacent to the incident region.
10. The method of claim 7, wherein the height of the transparent layer is greater than or equal to two wavelengths of the reconstruction light.
Technical Field
The present invention relates to an image recording and reconstructing method, and more particularly to a hologram image sheet, a hologram image recording method and a hologram image reconstructing method.
Background
Holography (holographiy) is a photographic technique that records information (e.g., amplitude, phase, etc.) in light waves (e.g., reflected or transmitted light waves) generated by an object, and the light reflected or transmitted by the object can be completely reconstructed by the recording negative to produce a holographic image of the corresponding object.
As shown in fig. 1, the currently known optical hologram (holographic film) manufacturing method includes: first, an image capturing
However, when the hologram 18P manufactured in the conventional manner is used to reconstruct a hologram image, the reconstruction light source must be disposed at a height position far away from the
Disclosure of Invention
In view of the foregoing, in one embodiment, a method for recording a holographic image is provided, which includes the steps of: superposing a full-image negative plate on a transparent substrate, wherein the transparent substrate comprises a first surface, a second surface and a light incoming area, the first surface and the second surface are separated by a certain thickness, and the full-image negative plate is superposed on the first surface or the second surface; an irradiation step: emitting object light and reference light, wherein the object light irradiates the first surface of the transparent substrate, and the light incoming area is used for the reference light to irradiate into the transparent substrate and perform total reflection for multiple times in the thickness to form internal total reflection light; and a recording step: the internal total reflection light and the object light interfere with each other to generate a total image interference pattern and are recorded on the total image film by light sensing.
In one embodiment, a hologram sheet includes a hologram layer, and the hologram layer records hologram interference patterns on a hologram film manufactured by the hologram recording method.
In one embodiment, a method for reconstructing a holographic image includes the following steps: preparing a holographic image sheet body, wherein the holographic image sheet body comprises a euphotic layer and a holographic image layer, the euphotic layer comprises a first surface, a second surface and an incidence area, a height is reserved between the first surface and the second surface, and the holographic image layer is overlapped on the first surface or the second surface and is recorded with holographic image interference grains; a reconstruction step: emitting a reconstruction light into the light transmission layer from the incident region, and totally reflecting the reconstruction light for multiple times in the height to form an internal total reflection light; and an imaging step: the internal total reflection light irradiates the holographic image interference pattern to form an image so as to form a holographic image.
In summary, the holographic image recording method according to the embodiment of the present invention irradiates reference light into the transparent substrate and performs total reflection for multiple times to form internal total reflection light, so that the internal total reflection light and object light interfere with each other to generate holographic image interference patterns and the holographic image interference patterns are recorded on the holographic film in a photosensitive manner, and therefore, when a holographic image is reconstructed in the following process, reconstruction can be performed through the internal total reflection light without considering the height position of a reconstruction light source, and the volume and thickness of a holographic image reconstruction device can be greatly reduced, thereby enabling the holographic image reconstruction device to be thinner.
Drawings
Fig. 1 is a schematic recording diagram of an embodiment of a conventional holographic image recording method.
FIG. 2 is a flowchart illustrating steps of a holographic image recording method according to an embodiment of the present invention.
Fig. 3 is a recording schematic diagram of a holographic image recording method according to an embodiment of the present invention.
FIG. 4 is an interference diagram of a holographic image recording method according to an embodiment of the present invention.
Fig. 5 is a recording schematic diagram of another embodiment of the holographic image recording method of the present invention.
FIG. 6 is a schematic recording diagram illustrating a holographic image recording method according to another embodiment of the present invention.
FIG. 7 is a flowchart illustrating steps of a method for reconstructing a full image according to an embodiment of the present invention.
Fig. 8 is a schematic reconstruction diagram of a full image reconstruction method according to an embodiment of the invention.
Wherein the reference numerals are:
1 holographic image recording device
2 holographic image reconstruction device
3 target object
11 full-image negative film
12 transparent substrate
121 first surface
122 second surface
123 side surface
IA1 light incident area
Thickness of T
TR1 internal total reflection light
13 spectroscope
14 first reflector
15 second reflecting mirror
16 third reflector
17 image pickup device
18 display panel
19 solid object
HF holographic image interference pattern
20 holographic image sheet
Light-transmitting layer 21
211 first surface
212 second surface
213 side edge surface
22 hologram layer
IA2 incident region
Height H
TR2 internal total reflection light
S1, S2 luminous unit
O object light
R reference light
C reconstruction light
HI holographic image
S01 preliminary step
S02 irradiation step
S03 recording step
S04 pretreatment step
S05 rebuilding step
S06 imaging step
10P image capture equipment
11P object placing platform
12P object
13P display screen
14P light emitting device
15P first reflector
16P spectroscope
17P second reflector
18P hologram negative
19P third mirror
Detailed Description
FIG. 2 is a flowchart illustrating steps of a holographic image recording method according to an embodiment of the present invention. The holographic image recording method is used for recording the image and information (such as amplitude, phase and the like) of an object on a negative film, so that the image of the object can be reproduced through the negative film subsequently. As shown in fig. 2, the method for recording a full-image according to the present embodiment includes a preliminary step S01, an irradiation step S02, and a recording step S03. In some embodiments, the steps of the above-mentioned holographic image recording method can be performed by a holographic
As shown in fig. 2, in the preliminary step S01, a full-image
In some embodiments, the
As shown in fig. 2, the preliminary step S01 may be followed by an irradiation step S02: the object light O and the reference light R are emitted as coherent lights (coherent lights), i.e. the object light O and the reference light R have coherence (coherent), but not limited thereto, and the object light O and the reference light R can be modulated differently. As shown in fig. 3, in the present embodiment, the light incident area IA1 of the
As shown in fig. 3, the
In some embodiments, the object light O and the reference light R can be formed through various different optical paths. For example, referring to fig. 3 and fig. 5, in the present embodiment, the
In another embodiment, as shown in fig. 6, the
In some embodiments, the light emitting unit S1 may be a laser unit, for example, the light emitting unit S1 may be a gas laser emitter, a carbon dioxide laser emitter, a liquid laser emitter, a solid state laser emitter, or a semiconductor laser emitter. In other embodiments, the lighting unit S1 can be an LED lamp or an incandescent lamp, but is not limited thereto.
As further shown in fig. 2, the irradiation step S02 may be followed by a recording step S03: the internal total reflection light TR1 and the object light O interfere with each other to generate a total image interference pattern HF, and the total image interference pattern HF is recorded on the
In some embodiments, as shown in fig. 2 and fig. 3, in the irradiation step S02, a plurality of reference lights R may be emitted from different angles and enter the
In summary, in the holographic image recording method according to the embodiment of the invention, the reference light R is irradiated into the
FIG. 7 is a flowchart illustrating steps of a method for reconstructing a full image according to an embodiment of the present invention. The holographic image reconstruction method is used for reconstructing a holographic image corresponding to the
As shown in fig. 7, in the preprocessing step S04, a hologram sheet 20 is first prepared, wherein the hologram sheet 20 includes a transparent layer 21 and a hologram layer 22. For example, as shown in fig. 8, the transparent layer 21 of the holographic image sheet 20 can be made of a light-guiding material, for example, the transparent layer 21 can be made of Polycarbonate (PC), acrylic Plastic (PMMA) or glass material to have a light-guiding function. The hologram layer 22 may record the hologram interference pattern HF recorded on the
As shown in fig. 8, the transparent layer 21 of the hologram sheet 20 includes a first surface 211 and a second surface 212 opposite to each other, and a height H is formed between the first surface 211 and the second surface 212, that is, the transparent layer 21 is a thick layer. In the embodiment, the hologram layer 22 is located on the first surface 211, but this is not limited, and the hologram layer 22 may also be located on the second surface 212. In addition, the light-transmitting layer 21 further includes a side edge surface 213 and an incident area IA2, where the side edge surface 213 connects the outer circumferences of the first surface 211 and the second surface 212, that is, the side edge surface 213 is the outer circumference of the light-transmitting layer 21. Incident area IA2 may be disposed on first surface 211, side edge surface 213, or second surface 212, in other words, incident area IA2 may be a partial surface of first surface 211, side edge surface 213, or second surface 212.
As shown in fig. 7, the reconstruction step S05 may be performed after the pre-processing step S04: a reconstruction light C is emitted from incident area IA2 into light-transmitting layer 21. For example, as shown in fig. 8, in the present embodiment, the incident area IA2 of the light-transmitting layer 21 is disposed on the side edge surface 213, the holographic image reconstruction apparatus 2 includes a light-emitting unit S2, the reconstruction light C can be emitted from the light-emitting unit S2, wherein the light-emitting unit S2 is disposed adjacent to the incident area IA2, and the light-emitting unit S2 can emit the reconstruction light C from the incident area IA2 into the light-transmitting layer 21, and the reconstruction light C further performs a plurality of Total Internal Reflection (TIR) within the height H of the light-transmitting layer 21 to form an internal Total reflection light TR2, where the internal Total reflection light TR2 is a zigzag reflection path. In some embodiments, the height H of the light-transmitting layer 21 is preferably equal to or greater than twice the wavelength of the reconstruction light C, so that the reconstruction light C can perform multiple total internal reflections within the height H of the light-transmitting layer 21 more smoothly.
However, the above-mentioned embodiment of fig. 8 is only an example, and in other embodiments, the reconstruction light C may also be irradiated from the first surface 211, the second surface 212, or a corner of the light-transmissive layer 21. Besides, the reconstruction light C can directly enter the light-transmitting layer 21, and the reconstruction light C can also enter the light-transmitting layer 21 through a reflection light path, a refraction light path, or a diffraction light path (for example, the light path type of fig. 5 or fig. 6).
In some embodiments, the light emitting unit S2 can be various laser light emitters for emitting laser light, wherein the laser light can be gas laser, liquid laser, solid laser, semiconductor laser, or the like, and the laser light can be visible light or invisible light. In other embodiments, the lighting unit S2 may also be an LED lamp or an incandescent lamp. In some embodiments, the reconstructed light C and the reference light R of the holographic image recording method may have the same or different optical characteristics (such as wavelength, frequency or color), which is not limited.
As shown in fig. 7, the reconstruction step S05 may be followed by an imaging step S06: the internal total reflection light TR2 is imaged by irradiating the holographic image interference pattern HF to form a holographic image HI. As shown in fig. 8, specifically, the hologram interference pattern HF on the hologram layer 22 of the hologram image sheet body 20 is generated by the hologram image recording method described above, that is, the object light O reflected by the
Therefore, according to the holographic image reconstruction method of the embodiment of the present invention, the reconstruction light C is irradiated into the light-transmitting layer 21 and is totally reflected for multiple times to form the total internal reflection light TR2, so as to irradiate the holographic image interference pattern through the total internal reflection light TR2 to form the holographic image HI, such that the holographic image reconstruction device 2 does not need to consider the height position of the light-emitting unit S2, for example, in fig. 8, the light-emitting unit S2 may be adjacent to the holographic image sheet 20, thereby greatly reducing the volume and thickness of the holographic image reconstruction device 2 and facilitating the thinning.
In summary, although the present invention has been described with reference to the preferred embodiments, it should be understood that the invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention.
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