CN101454729B - Hologram and its photography method - Google Patents

Abstract

The invention provides a security hologram and a photographing method thereof, wherein a reproduced image in longitudinal and transverse directions has sufficient three-dimensional sense, is difficult to forge, and can easily judge a forged product. The hologram is composed of a reflection-type volume hologram (H2), and is observed by recording a minute reflection image (F, Q ') of a light source at least either in front of or behind a subject image (P) so as to be reproducible, and by moving an observation position (E) along the hologram surface, the relative position between the subject image (P) and the minute reflection image (F, Q') is changed.

Description

Hologram and its photography method

technical field

The present invention relates to a hologram and a photographing method thereof, and in particular, to a security hologram and a photographing method thereof which are difficult to forge and are easily judged as counterfeit.

Background technique

With regard to holograms, the market is being developed as an anti-counterfeiting application that can be visually judged from the viewpoint of its graphic design. The holograms that occupy most of the market are embossed holograms, and various designs that can be judged visually are designed. However, this embossed hologram can also be easily produced in recent years, so the anti-counterfeiting property is lowered.

However, the embossed hologram can only receive parallax in a certain direction (especially horizontal), so it is a representation method that can only obtain a three-dimensional effect in one direction. As opposed to embossed holograms, volume-type holograms have been developed, and in recent years, the volume-type holograms have been marketed for anti-counterfeit purposes. Volumetric holograms that express a three-dimensional effect both vertically and horizontally require authenticity judgments due to differences in design from conventional embossed holograms. In the volume type hologram, in the case of photographing an ordinary model, it is possible to create a photo with a three-dimensional effect in both vertical and horizontal directions, but it may not be easy to recognize the object due to the three-dimensionality, light source, and design of the subject. A case where there is three-dimensionality both vertically and horizontally.

In the past, anti-counterfeiting volume holograms in which fine patterns that cannot be recognized in a normal state have been three-dimensionally recorded have been disclosed, for example, in Patent Document 1, but as described above, it cannot be said that a sufficient three-dimensional emotional photos.

Patent Document 1: Japanese Patent Application Laid-Open No. 11-24538

Contents of the invention

The present invention has been made in view of this situation in the prior art, and its object is to provide a security device that reproduces images with sufficient three-dimensionality in both vertical and horizontal directions, is difficult to forge, and can easily judge counterfeit products. Holograms and their photographic methods.

The hologram of the present invention that achieves the above object is composed of a reflection type and a volume type hologram, and records the subject image and the tiny reflection image of at least one light source in front or behind it in a reproducible manner, so that the observation position is along the By moving the hologram surface, the relative positions of the subject image and the minute reflection image are changed and observed.

In this case, it is preferable that the subject image is composed of a partially deformed image. In this case, for example, the subject image is composed of character graphics, or a part of the whole may be composed of deformed character graphics. In addition, the contrast ratio of the deformed character figure part and the other undistorted character figure part of the said subject image may be reversed.

In addition, the minute reflection image is reproducibly recorded on both sides of the front and back of the subject image, and the front minute reflection image and the rear minute reflection image may be reflection images of the same light source.

In addition, the minute reflection image is reproducibly recorded on both sides of the front and back of the subject image, and preferably at least one of them has a relative position change amount of at least one of the subject images relative to the subject image. more than half the diameter.

The method of photographing a hologram according to the present invention is characterized in that a refractive index body is arranged on the hologram recording side of the subject, and the first object light from the subject passing through the refractive index body and the second object light as described below are arranged. The second object light is incident on the hologram recording material disposed on the hologram recording side of the subject, and at the same time, the reference light is incident on the above hologram recording material and interfered to perform recording. The hologram recording side irradiates the illumination light to the above-mentioned refractive index body and the light reflected by the incident side surface of the above-mentioned refractive index body is refracted by the incident side surface of the above-mentioned refractive index body and is reflected by the output side surface of the above-mentioned refractive index body. At least one of the reflected light constitutes.

Another method of photographing a hologram according to the present invention is characterized in that a semi-transmissive reflective surface is arranged on the hologram recording side of the subject, so that the first object light and the first object light from the subject passing through the semi-transmissive reflective surface The second object light, which is irradiated with illumination light from the hologram recording side to the semi-transmissive reflective surface and reflected by the semi-transmissive reflective surface, is incident on the hologram recording material disposed on the hologram recording side of the above-mentioned object, and simultaneously makes the reference light It is incident on the above-mentioned hologram recording material and is recorded by interference.

In conclusion, the illumination light irradiated onto the refractive index body or the transflective surface from the hologram recording side can be transmitted through the hologram recording material and irradiated from the front side of the hologram recording material.

In this case, it is preferable that the illumination light irradiated onto the refractive index body or the semi-transmissive reflection surface from the hologram recording side is focused near a position where the hologram recording material passes through.

In addition, at least one of the incidence-side surface and the emission-side surface of the above-mentioned refractive index body is preferably constituted by a curved surface or a curved surface other than a plane.

At this time, the above-mentioned refractive index body is constituted by a convex-planar positive lens whose surface on the incident side is convex and the exit side is flat, and the reflected light of the illumination light reflected on the outer peripheral end of the convex surface on the incident side of the above-mentioned convex-planar positive lens is relative to the above-mentioned The incident angle of the hologram recording material is set as θ ₁ , and the incident angle of the reflected light reflected by the outer peripheral end of the flat surface on the exit side relative to the incident angle of the above-mentioned hologram recording material Set as θ ₂ , set the distance from the above-mentioned hologram recording material to the subject as L, set the size of the above-mentioned hologram recording material as H, and set the diameter of the above-mentioned convex-planar positive lens as R. At this time, according to satisfying

tan ^-1 {(H-2R)/4L}≦θ ₁ ≦tan ^-1 {(2H-R)/2L}

…(1)

tan ^-1 {(H+2R)/4L}≦ _θ2 ≦tan ^-1 {(2H+R)/2L}

…(2)

configured and documented in at least one of the ways.

In addition, it is preferable that the above-mentioned transflective reflection surface is formed of any flat surface, curved surface, curved surface, or diffused surface.

In addition, the first hologram is recorded by making the reference light incident from the same side as the first object light and the second object light, and the reproduction illumination light is made incident on the first hologram to generate diffracted light, Simultaneously, other reference light is incident from the opposite side to the volume hologram recording material disposed at the incident position of the diffracted light and interferes to record a second hologram, whereby the hologram of the present invention can be obtained.

The present invention includes holograms recorded by the above hologram imaging method.

In the hologram of the present invention, the object image and the tiny reflection image of at least one light source in front or behind it are recorded in a reproducible manner, and the observation position is moved along the hologram surface, thereby the object image The relative position between the microreflected image and the microreflected image changes and is observed. Therefore, due to the three-dimensional effect including the degree of deformation of the subject, and the relative position and moving direction of the microreflected image reflected in the hologram at the same time , number and forgery becomes more difficult, on the other hand, it is easy to judge whether the hologram is genuine or forged.

Description of drawings

FIG. 1 is an optical path diagram illustrating an example of a first-stage imaging method in the hologram imaging method of the present invention.

FIG. 2 is a diagram for explaining an object image generated when illuminated with first object illumination light and second object illumination light.

Fig. 3 is a diagram showing a configuration of a reflection hologram for recording a second stage.

Fig. 4 is a diagram for explaining a reproduced image from a second hologram.

FIG. 5 is a diagram for explaining an example of a character figure, a modified example thereof, and a modified image thereof.

Fig. 6 is a diagram showing the angular range of the outermost light rays among the reflected light traveling so as to diverge from the divergence point O' when capturing the first hologram corresponding to Fig. 1 .

FIG. 7 is a diagram showing the angular range of the outermost light rays among the reflected light traveling so as to diverge from the divergence point F when the first hologram corresponding to FIG. 1 is captured.

FIG. 8 is a diagram illustrating an example of a transparent refractive index body arranged in front of a subject.

FIG. 9 is a diagram illustrating an example of a half mirror arranged in front of a subject.

In the picture:

1...the first hologram recording material

2…Subject

3…lens

4…diffusion plate

5...first object illumination light

6…mask

7… opening

8…light through the opening

9…second object illumination light

10...Positive lens

11...first object light

12…second object light

12 ₁ …reflected light

12 ₁₀ ... the outermost ray of reflected light 12 ₁

12 ₁₂ …reflected light

12 ₂₀ ... the outermost ray of reflected light 12 ₂

13…reference light

21...Second hologram recording material

22...reproduce illumination light

23…diffracted light

24…reference light

25...reproduce lighting light

31...Convex surface of recording material side of lens (front of lens)

32...The plane of the subject side of the lens (back of the lens)

H1...the first hologram

H2...Second-stage reflective hologram (second hologram)

P...Virtual image of the subject (distorted image, reproduced image)

O'...divergence point (reproduced image)

F... Focus point (reproduced image)

F’…Focus point

E…the eye of the observer

Detailed ways

Hereinafter, the hologram of the present invention and its photographing method will be described with reference to the drawings.

First, the hologram of the present invention will be described in order of photographing. The hologram of the present invention is captured in two stages.

FIG. 1 is an optical path diagram for explaining an example of the photographing method in the first stage. A planar transmissive subject 2 is disposed facing one side (right side in the drawing) of a first hologram recording material such as a photopolymer. An example of the subject 2 will be described later. In addition, a lens 3 is disposed on the recording material 1 side of the subject 2 . In this example, the lens 3 is a plano-convex positive lens, and its plane side is arranged in close contact with the subject 2 or at a certain distance. In addition, a diffuser plate 4 is placed in close contact with the object 2 on the side opposite to the lens 3 . Furthermore, when the transmissive subject 2 is illuminated with the first object illumination light 5 from the diffusion plate 4 side, the diffused light transmitted through the transmissive subject 2 passes through the lens 3 arranged in front thereof to form a subject. 2, the first object light 11 proceeding from the virtual image is incident on one side of the first hologram recording material 1.

On the other hand, with respect to the first hologram recording material, facing the other side (the left side of the figure), the mask 6 with the tiny opening 7 is arranged, and when the positive lens 10 is separated from the substantially front side of the recording material 1 opposite side thereof, When illuminated with the second object illuminating light 9, the light 8 transmitted through the opening 7 of the mask 6 once condenses, passes through the recording material 1 arranged near the condensed point, and becomes divergent light this time and enters the lens. 3. A part of the illumination light is reflected (Fresnel reflection) by the convex surface and the flat back surface, and becomes the second object light 12, which is incident on one side of the first hologram recording material 1.

In addition, the reference light 13, the first object light 11, and the second object light 12 are incident obliquely from the same side as the incident side of the first object light 11 and the second object light 12, and interfere with each other to develop. In the first hologram recording material 1, a first hologram H1 is recorded.

An image recorded on the hologram H1 by such an arrangement will be described. 2 is a diagram for explaining an object image generated when illuminated with the first object illumination light 5 and the second object illumination light 9 as described above, and the diffused light transmitted through the flat transmissive object 2 passes through the lens 3 , as viewed from the recording material 1 side, a convex virtual image P of the subject 2 is formed. The first object light 11 in FIG. 1 is incident on the first hologram recording material 1 as light emitted from the virtual image P. As shown in FIG.

In addition, the light 8 that has been condensed and then diverged after passing through the opening 7 of the mask 6 enters the convex surface 31 of the lens 3 on the side of the recording material 1 , and a part thereof undergoes Fresnel reflection. Its reflected light 12 ₁ is incident on the first hologram recording material 1 as light diverging from the point O′ behind the convex surface 31 .

Furthermore, the part of the light 8 that has passed through the convex surface 31 of the lens 3 is refracted on the surface 31, and proceeds to be focused at another point F' behind the convex surface 31, but is incident on the subject 2 side of the lens 3. After being reflected by the plane 32 of the point F', it advances toward the point F on the recording material 1 side of the lens 3 as the image of the point F', passes through the point F, and enters the first hologram as light 12 ₂ diverging from the point F. Recording material 1.

The reflected light 12 ₁ proceeding so as to diverge from the point O' and the reflected light 12 ₂ diverging from the point F become the second object light 12 in FIG. 1 , and are incident on the first hologram recording material 1 .

As can be seen from the above description, the object image holographically recorded by interference with the reference light 13 in the hologram H1 is the virtual image P of the subject 2 passing through the lens 3 in FIG. Side divergence point F.

Then, using the first hologram H1 recorded in the first hologram recording material 1 as described above, the reflection type hologram H2 of the second stage is recorded. The configuration for this is shown in FIG. 3 . The first hologram H1(1) photographed by the arrangement shown in FIG. 1 is arranged at the position shown in FIG. 1 , and the reproduction illumination light 22 traveling in the direction opposite to the reference light 13 at the time of photographing is diverted from the reference light 13 at the time of recording. When the side opposite to the incident side of 13 is incident on the back of the first hologram H1 (1), at this time, through the diffracted light 23 to its front, the virtual image P of the subject 2, the convex surface 31 in front of the lens 3 Refracted and reflected by the back plane 32 to form the convergent point F, and the reproduced real image of the divergence point O' formed by the reflection of the convex surface 31 (such reproduced images are also represented by the same symbols P, F, O' ), are reproduced while maintaining the spatial configuration at the time of recording. In the vicinity of these reproduced images (in FIG. 3, near the virtual image P of the subject 2), a second hologram recording material 21 made of a volume type hologram recording material such as photopolymer is disposed, and this time the reference light 24 The diffracted light 23 simultaneously enters and interferes from the side opposite to the incident side, and is developed, whereby the second hologram H2 is recorded on the second hologram recording material 21 . This second hologram H2 becomes the security hologram of the present invention. Alternatively, by holographically duplicating the second hologram H2 so as to have the same characteristics, the security hologram of the present invention is obtained. Wherein, the hologram is a reflective hologram.

FIG. 4 is a diagram for explaining the reconstructed image from the second hologram H2 thus obtained. When the opposite side is incident on the second hologram H2 (21), the deformed image P of the subject 2 based on the lens 3, the point F formed by refraction at the front 31 of the lens 3 and reflected at the back 32, The point O' formed by being reflected on the front surface 31 of the lens 3 maintains the spatial configuration during recording, and in this state is a real image or a virtual image (in the figure, the image P and the point F are real images, and the point O' is a virtual image). is reproduced. Therefore, if the observer's eyes E are located on the incident side of the reproduced illumination light 25, these deformed images P, point F, and point O' are observed under the stereoscopic arrangement at the time of recording, but for ordinary observers, they cannot You will notice point F and point O', or just see the reflection of the surrounding light source image, and you are not particularly worried.

On the other hand, when the transmissive object 2 does not have a character pattern as shown in FIG. As shown in FIG. 5( b), only the portion where the lens 3 is placed becomes a deformed character figure, which becomes a convex surface on the eye E side to form an image P, so there is sufficient three-dimensionality in both vertical and horizontal directions.

In addition, these images F, P, O' are reproduced arranged in the depth direction as shown in FIG. In Fig. 2, when the arrow is represented as up) moves relatively, the image F moves downward, and the image O' moves upward. On the contrary, when the observer's eyes E are relatively moved downward (the arrow represents downward in Fig. 2), Move up like F and down like O'.

Therefore, it is possible to easily determine whether the hologram is real or not based on the three-dimensional effect including the degree of deformation of the text and graphics of the subject image P, the relative position and moving direction of the images F and O' simultaneously reflected in the hologram. .

Next, in FIG. 4, the observable range of the image O' and the image F when the observer's eye E is relatively moved relative to the second hologram H2, and the observation range of the image O' and the image F with respect to the deformed image P are examined. range of movement.

FIG. 6 shows the outermost ray 12 of the reflected light 12 1 reflected on the convex surface 31 of the lens 3 that proceeds in such a manner as to diverge from the divergence point O' when the first hologram H1 corresponding to FIG. ₁ is captured. The diagram of the angle range of ₁₀ mainly sets the incident angle range with respect to the first hologram recording material 1 to a range from a minimum of θ _1min to a range of θ _1max by setting the radius of curvature of the convex surface 31 . Here, when the distance from the first hologram recording material 1 to the subject 2 is set as L, the size of the first hologram recording material 1 is set as H, and the diameter of the lens 3 is set as R, when set When the incident angle of the reflected light ₁₂₁₀ reflected on the outer peripheral end of the convex surface 31 of the lens 3 with respect to the first hologram recording material 1 is _θ1 , _θ1min and _θ1max are set as follows,

θ _1min ＝tan ^-1 {(H-2R)/4L}

θ＝ _1max tan ^-1 {(2H-R)/2L}

to satisfy

θ _1min ≦θ ₁ ≦θ _1max

Right now

tan ^-1 {(H-2R)/4L}≦θ ₁ ≦tan ^-1 {(2H-R)/2L}

…(1)

Assuming that the incident angle of the reflected light 12 ₁₀ reflected on the outer peripheral end of the convex surface 31 of the lens 3 with respect to the first hologram recording material 1 is θ ₁ , the image O in the finally obtained second hologram H2 is 'The visibility of the movement is ensured. That is, the lower limit of θ ₁ , θ _1min , as shown in Fig. 4, refers to the image O' that relatively moves in the same direction with respect to the deformed image P of the subject 2 when the observer's eyes E are relatively moved upward or downward. The observable range is limited to the range of ±H/4 from the center of the original first hologram H1(1), if it reaches the limit ±H/4 beyond this, the image O' reaches the periphery of the deformed image P, If the observer's eye E is moved outward from this limit, the image O' will be invisible at the earliest. In addition, the upper limit θ _1max of θ ₁ means that the position of the image O' reaches the distance deformation image P when the observer's eye E is moved up or down to reach the outer circumference of the original first hologram H1(1). , if the observer's eye E is moved outward from the outer periphery of the original first hologram H1(1), the reflected light 12 ₁ is not recorded in the second hologram H2 at the earliest, so the image O' becomes invisible.

In this way, θ ₁ is near the lower limit of θ _1min ≦ θ ₁ ≦ θ _1max , the image O' moves relatively within the range of the deformed image P, but the observable movement range of the observer's eyes E is limited to the distance from the original first hologram The center of Figure H1(1) is about ±H/4. In addition, near its upper limit, the observable movement range of the observer's eyes E is within the range of the original first hologram H1(1), but the relative movement range of the image O' is limited to the distance from the center of the deformed image P Within the range of approximately 1/2 of its diameter, the relative movement speed becomes slower.

Of course, if the reflected light 12 ₁₀ is incident on the outer peripheral end of the first hologram recording material 1, it is set to

θ ₁ =tan ^-1 {(HR)/2L}

Then, the image O' relatively moves within the range of the deformed image P, and the observable movement range of the observer's eyes E is within the range of the original first hologram H1(1), and the visibility becomes the best.

FIG. 7 shows reflected light 122 that is refracted on the convex surface 31 of the lens 3 and reflected on the plane 32 that advances in such a manner as to diverge from the divergence point F when the first hologram H1 corresponding to FIG. ₁ is photographed. The figure of the angle range of the outermost light 12 ₂₀ is mainly set by the radius of curvature of the convex surface 31 and the setting of the refractive index of the lens 3, and the range of the incident angle with respect to the first hologram recording material 1 is set to the minimum θ _2min to The range of maximum θ _2max . As in the case of FIG. 6 , L, H, and R are defined. When the incident angle of the reflected light 12 _{to 20} reflected on the outer peripheral end of the convex surface 32 of the lens 3 is set to θ ₂ with respect to the first hologram recording material 1 , set as follows,

θ _2min ＝tan ^-1 {(H+2R)/4L}

θ _2max ＝tan ^-1 {(2H+R)/2L}

to satisfy

θ _2min ≦θ ₂ ≦θ2 _max

Right now

tan ^-1 {(H+2R)/4L}≦ _θ2 ≦tan ^-1 {(2H+R)/2L}

…(2)

Let the incident angle of the reflected light ₁₂ that is refracted on the convex surface 31 of the lens 3 and reflected on the outer peripheral end of the plane 32 relative to the first hologram recording material 1 be θ ₂ , thus, in the finally obtained second hologram The visibility of the movement of the image F in FIG. H2 is ensured. That is, as in the case of FIG. 6 , the lower limit of θ _{2 min} , as shown in FIG. 4 , means that when the observer's eyes E are relatively moved upward or downward, the direction of the deformed image P with respect to the subject 2 is reversed. The observable range of the image F that moves relative to the direction is limited to the range of ±H/4 from the center of the original first hologram H1(1). If it reaches the limit ±H/4 beyond this, the image F will be deformed The periphery of the image P, if the eye E of the observer is moved outward from this limit, the image F will be invisible at the earliest. In addition, the upper limit θ _2max of θ ₂ means that when the observer's eye E is moved up or down to reach the outer periphery of the original first hologram H1 (1), the position of the image F reaches the distance of the deformed image P At about 1/2 of the center, if the observer's eyes E are moved outward from the outer periphery of the original first hologram H1(1), the reflected light 12 ₂ is not recorded in the second hologram H2 at the earliest, so the image F become invisible.

In this way, θ ₂ is near the lower limit of θ _2min ≦ θ ₂ ≦ θ _2max , the image F moves relatively within the scope of the deformed image P, but the observable movement range of the observer's eyes E is limited to the distance from the original first hologram The center of H1(1) is about ±H/4. In addition, near its upper limit, the observable movement range of the observer's eyes E is within the range of the original first hologram H1(1), but the relative movement range of the image F is limited to the distance from the center of the deformed image P. In the range of approximately 1/2 of the diameter, the relative movement speed becomes slower.

Of course, in this case, if the reflected light 12 _{to 20} is incident on the outer peripheral end of the first hologram recording material 1, it is set to

θ ₂ =tan ^-1 {(H+R)/2L}

Then the image F relatively moves within the range of the deformed image P, and the observer's eyes E can observe the moving range within the range of the original first hologram H1(1), and the visibility becomes the best.

Among them, the hologram H2 of the present invention is a volume-type and reflection-type hologram, so whenever actual reproduction (observation) is performed, even if the reproduction illumination light 25 shown in FIG. White light is fully reproduced.

However, when the transmissive object 2 is, for example, a character figure as shown in FIG. If the deformation shown, the deformed image P deformed by the lens 3 is shown in FIG. There is a more obvious three-dimensional effect in both vertical and horizontal directions.

In addition, as the character graphics of the subject 2, as the subject 2 corresponding to FIG. 5( b) is exemplified in FIG. Part of it is set as a negative image with opposite contrast, so that the deformed image P deformed by the lens 3 is also shown in FIG. Abundance, meanwhile, when for the figure, deformation is further emphasized, so forgery becomes more difficult.

In addition, when the first hologram H1 is photographed, as the transparent body disposed on the recording material 1 side of the subject 2 to deform the subject image, as shown in FIG. The lens 3) can use various refractive index bodies. This is illustrated in FIGS. 8( a ) to ( f ). Figure 8(b) is the case of using a biconvex lens of positive magnification, Figure 8(c) is the case of a plano-concave lens of negative magnification, and Figure 8(d) is the case of using a biconcave lens of negative magnification. Furthermore, as shown in FIG. 8( e ), one or both of them may have an arbitrary curved surface (a wavy curved surface in the figure), and as shown in FIG. 8( f ), one or both of them may be A refractive index body having a curved surface (the zigzag curved surface in the figure). These are examples of transparent refractive index bodies arranged in front of the subject 2, and may have other shapes.

In this way, a variety of refractive index objects are arranged in front of the subject 2, and the hologram of the present invention is captured, so that the deformation of the subject image P becomes more colorful, and the expression of the three-dimensional effect becomes more abundant. , and its falsification becomes more difficult. Moreover, the relative positions, moving directions, and numbers of the images corresponding to the images F and O' simultaneously reflected in the hologram become more colorful, and forgery becomes more difficult. On the other hand, it is possible to easily It is judged whether the hologram is true or false.

Furthermore, when the first hologram H1 is photographed, as a transparent body arranged on the recording material 1 side of the subject 2, in addition to the refractive index body shown in FIG. Half mirrors (transflective reflection surfaces) of various surface shapes may be arranged separately from the subject 2 . In the case of using such a half mirror, the deformation of the subject image cannot be generated, but the relative position, moving direction, and number of the images corresponding to the images F and O' reflected in the hologram at the same time can also be adjusted. It becomes more colorful, and forgery becomes more difficult. On the other hand, it is easy to judge whether the hologram is real or not. Examples of such half mirrors are shown in FIGS. 9( a ) to ( e ). Fig. 9(a) is a case where a simple planar semi-transparent mirror is arranged parallel to the subject 2, and Fig. 9(b) is a case where a semi-transparent mirror with a negative magnification convex mirror is arranged in front of the subject 2 Fig. 9(c) is the situation where the planar semi-transparent mirror is obliquely arranged relative to the subject 2, and Fig. 9(d) is the semi-transparent reflection of any curved surface (wavy curved surface in the figure) A case where the mirror is arranged in front of the subject 2 . Furthermore, as shown in FIG. 8( e ), it is a case where a half mirror having a diffused partial reflection area is arranged in front of the subject 2 . These are examples of half mirrors arranged in front of the subject 2, and may have other shapes. Here, the ratio of the reflectance and the transmittance of the half mirror (semi-transmissive reflection surface) can be set arbitrarily as needed.

As mentioned above, the hologram of the present invention and its photographing method have been described based on the examples, but the present invention is not limited to these examples, and various modifications are possible.

Claims (6)

1. A hologram, characterized in that, It is composed of a reflective and volume hologram, and it is made by recording the subject image and the tiny reflection image of at least one light source in front or behind it in a reproducible manner. By moving the observation position along the hologram surface, the The relative position between the subject image and the minute reflection image is changed and observed. 2. The hologram of claim 1, wherein The subject image is composed of a partially deformed image. 3. The hologram of claim 2, wherein: The subject image is composed of character graphics, and part of the whole is composed of deformed character graphics. 4. The hologram of claim 3, wherein: The contrast between the deformed character and graphic part and the other undistorted character and graphic part of the subject image is reversed. 5. The hologram according to any one of claims 1 to 4, characterized in that, The minute reflection image is reproducibly recorded on both sides of the front and back of the subject image, and the front minute reflection image and the rear minute reflection image are reflection images of the same light source. 6. The hologram of claim 5, wherein The tiny reflection image is reproducibly recorded on both sides of the front and back of the subject image, and the relative position change of at least one of them with respect to the subject image is equal to the subject image. more than half of the diameter.

Images