DE1497565B2 - HOLOGRAM PRINT COPY AND METHOD OF MANUFACTURING IT - Google Patents

Description

1 2

The invention relates to a hologram impression layer produced for a photographic plate

copy and a method for producing such Ab- will. Photoresists, such as those used as anti-etch coatings

print copies. z. B. be used in semiconductor technology, so-

In the following, the term »light« is intended to be electro- like processes using thermal

Magnetic radiation in the infrared, visible and plastic recording media can also

include the ultraviolet spectral range. serve to produce phase holograms.

Usually a hologram on a SiI photoresist and thermoplastic recording

The emulsion layer of a photographic plate materials generally have a higher level

recorded, then the interference fringe resolving power as the silver emulsion one

Pattern after developing the plate corresponds to a photographic plate.

corresponding changes in the opacity of the layer results. The invention is based on the object Pha-Es however, it was also found that the thickness of senholograms is similar to that of phonograph records Emulsion layer of a developed hologram multiple. This task is planned according to the invention a linear function of the opacity of the emul- solves through a dimensionally stable recording medium, sion is. The interference fringe pattern is thus also at least one hologram in its surface by relief patterns with respect to the bottom of the emul shape of a relief pattern with respect to the bottom of the sion surface reproduced, the profile and surface is indented, which consists of a number of Contours the relative positions and relative sizes of the elevations and depressions, whose rhyme Represent information contained in the hologram. relative position and size of the hologram information Such a relief pattern can represent independently of 20.

any fluctuations in the opacity of the photographic

phical plate used to make the present invention, such an imprint copy of a

to restore the information contained in the gram. umpteen large holograms that are practically

In particular, the table in the emulsion occupies the entire area of the impression, and the silver contained can be removed or bleached, ζ. B. as however preferably contains a hologram by means of a photographic attenuator, and a print copy according to the invention a large number then receives a transparent photographic plate, of separate, printed micro-phase holo on which the information of the hologram both in grams. “Micro-hologram” is to be understood here as a form of the above-mentioned relief pattern as well as in a hologram which has an area in the form of changes in the refractive index that occupies a maximum of 10 square millimeters. For many spatially coincide with the relief pattern, on application areas are micro-holograms with is drawn. Considering only the relief pattern and an area on the order of 1 square, the fact that the refractive index millimeters is most appropriate. The image information contained in a 35 mm transparent photographic plate from the film image can, for example, be different from the air, so it can be seen that at 35 it is wisely stored in a micro-hologram mm ² , since the super-coherent, monochromatic light beam is the limit of resolution of a hologram in the size of the light emerging from the thicker parts of the plate is the order of a light wavelength,
relative to that from the thinner parts of the plate In the. Micro-holograms emerging on the surface of light in the phase by one of the 40 of a print copy, the most varied of information corresponding to the difference in thickness can be stored delayed mation, z. B. black and white or is. These phase delays, which document from point to color movie images, text or any do-point corresponding to the hologram relief pattern. The information does not have to be indistinguishable either, it provides the same diffraction effects as other image information, but it can also be a hologram which is recorded in the form of opacity or code characters. Information is obtained in the form of micro-holograms, so here too an image of the original material has the advantage that extremely high packing densities alder front. are reachable.

Instead of bleaching the silver in the emulsion, the invention means that holograms can be detected A 5 ° print copy is also created on the surface of the photo layer, which is produced by means of a "mother-thin reflective metal layer deposited hologram" and which insbewerden a large number of separate microholo follows the course of the relief pattern precisely. In this case one suffers from the gramme contained.

Relief pattern of the metallized surface of the plate The subject of the invention is explained in more detail on the basis of the reflected beam, spatially coherent, monochrome drawings; it shows
phase shift corresponding to matic light. 1 a schematic representation of a begen when it is reflected by a relatively high or low point preferred embodiment of a one-sided, transt of the relief pattern. Also in the parent hologram print copy,
In this case, an image F i g is created by diffraction. Figure 2 is a schematic representation of one of the original wavefronts. A hologram, in the case of a preferred embodiment of a two-sided holodeme, the information through a metalized, reflecting relief pattern corresponding to the interference fringe imprint or through the surfaces,

Meaningful changes in the refractive index re F i g. 3 is a greatly enlarged cross-sectional view

is registered and not by a pattern-changing relief pattern of a microhologram

licher opacity or light transmission, is used as a 65 print copy,

Phase hologram called. F i g. 4 a schematic representation of a preferred

A phase hologram does not necessarily need dedicated equipment for making a nut the detour via a silver-containing emulsion hologram,

3 4

F i g. 5 the arrangement of micro-holograms making a mother record of a plurality

on a mother record made with the one shown in FIG. 4 of micro-holograms used for the production of

device shown has been manufactured, hologram print copies can be used.

F i g. 6, 7 a and 7 b Modifications of the optical It is only assumed here as an example

Transmitter and the closure of the in F i g. 4 shows that the different micro-holo

Established the facilities required to display various information recorded in colorgrams

image-micro-hologram-mother-recordings corresponds to individual images of a movie,

deliver, the device shown in Fig. 4 contains

F i g. 8 and 9 are schematic representations of the an optical transmitter 400, a so-called

Order of color image microholograms on a IO "laser", which creates a beam 402 spatially coherent

Mother record emitting monochromatic light with a shutter. The source for

7a and 7b respectively, the spatially coherent monochromatic light

10 shows a simplified representation of an input does not necessarily have to be an optical one

Direction for the reproduction of the on a transparent transmitter (laser), since originally not spatial

Hologram print copy recorded information- 15 coherent monochromatic light, e.g. B. from a

tion, gas discharge lamp, by means of a fine hole

F i g. 11 a simplified representation of an overlay can be made spatially coherent. the

direction for reproducing the intensity of the light beam on a hologram is, however, when using

A print copy with a metallized, reflective surface of a fine pinhole diaphragm is relatively small, and you

area registered information, 20 is therefore preferably used as a source for the

Fig. 12, 13 and 14 different devices spatially coherent monochromatic light one

for utilizing a hologram information optical transmitter with stimulated emission

and works.

15 shows a modification of the one shown in FIG

provided device for reproducing color images, 25 404, z. B. a partially transparent mirror into one

the reflected beam 405 stored in microhologram print copies and a transmitted one

are. Split beam 406. The reflected beam 405 becomes

In the F i g. 1 and 2, the two are in principle deflected by a mirror 408, and then is

. possible forms of a hologram print copy, its cross-section enlarged by means of lenses 412, 414,

c-i shown. Like F i g. 1 shows, a HoIo- 30 The beam 410 exiting lens 414 represents

. gram print copy, similar to a record, the first of the beam to be brought to interference

<fill from a disk 100 with a central hole 102, the "first component" of the interference pattern

stand. The disk 100 consists of a molded dar.

stable, transparent, isotropic material. The two- A photosensitive recording medium 416,

the opposite sides of the disc 35 of, for example, a silver emulsion, a photo

100 run parallel to each other, and in which a lacquer or a thermoplastic material contains and

Side of the disc is a number of separate reliefs - has the shape of a flat plate, is at one end

pattern microholograms 104 embossed. The drive mechanism 418 attached, its details

Cro-holograms on any one basis may not form part of the present invention. Of the

Center hole 102 centered spiral lie. 40 drive mechanism 418 is capable of recording

Both to rotate and to rotate the hologram impression carrier 416 shown in FIG copy consists of a disk 200 from a form- up or down move as through stable material, it has a center hole 202 and arrows are indicated. Immediately before the two opposite parallel sides. drawing carrier 416 there is a mask 420 In contrast to the one shown in FIG. 1 shown, trans- 45 with an opening 422 which is sized so that Parent hologram print copies are, however, in the case of the recording medium 416 with the exception of one F i g. 2 Both sides of the plate are metallized and reflect the small part corresponding to the opening 422 as perfect as possible. Also included is covered. Immediately in front of the opening 422 are both Sides of the disc 200 relief pattern micro-detects a shutter 424 with the drive holograms 204 or 206. The in FIG. 2 shown 50 mechanism 418 is coupled and provided by this “Hologram plate” can therefore be controlled twice as much as with a dashed line micro-holograms the same size and layout is shown.

tion like that in F i g. 1 plate shown. The cross section of the transmitted beam 406

As with Fig. 1, the various microholo- is magnified by two lenses 428, 430, and the

Grams of the two groups 204, 206 each penetrated along 55 beam 426 of enlarged cross section then

one with respect to the central hole 202 centered a diffuser plate, for example made of opal glass

Be arranged spiral. can exist and a diffuse light beam 432

F i g. 3 shows a relief pattern on a greatly enlarged scale. The diffuse light beam 432 falls on a single one typical micro-holograms, as shown on the nes film frame 440 of a motion picture strip 434, the Surface of a hologram plate in Fig. 1 60 by a not shown and with the or 2 type shown is pressed. The relief drive mechanism 418 coupled transport pattern 300 consists, as FIG. 3 shows, of an attachment mechanism from a supply reel 436 to one number of bumps in relation to the base of the take-up reel 438 is moved. The diffuse light surface, into which the pattern is pressed. The in-ray 432 penetrates the film image 440 and becomes daformation of the hologram is modulated accordingly by the relative 65 at. The modulated light The position and size of the elevations in the profile form the second component of the interference pattern, fixed. namely, the light beam 232, which the in the HoIo-F i g. 4 schematically shows a device for containing information to be recorded.

As shown, the first, "direct" light beam is 410 as well as at least a portion of the second Light beam 442 directed onto opening 422 in mask 420. However, the opening 422 is normally closed by a shutter 424 so that no light through the opening 422 to the one behind her lying small area of the recording medium 416 can get. However, if the shutter 424 is opened briefly, light falls from both beam 410, the "reference beam," and beam 442, the "information beam", through the opening 422 of the mask 420 onto the small one, through the opening 422 limited area of the surface of the recording medium 416, where an interference pattern accordingly of the information contained in the information beam 422 is produced. This interference pattern that a Micro-hologram is recorded on the recording medium 416.

Instead of the shutter 424, an optical transmitter operating in pulse mode can of course also be used 400 are used, which is in synchronism with the drive of the recording medium 416 and the Filmstrip 434 delivers short flashes of light.

After recording a microhologram corresponding to a frame of the filmstrip is, the recording medium 416 is rotated by a certain angle and the axis of rotation becomes shifted by a certain amount, so that a new area of the recording medium behind the Opening 422 of the mask 420 arrives. At the same time, the film strip 434 is advanced one frame width, so that a new single image comes into the path of the diffuse light beam 432. Now the Shutter 424 actuated again. This is how the successive frames of the filmstrip become recorded on the recording medium 416 as separate microholograms. The opening 422 in mask 420 may be sized so that each microhologram has an area of the order of magnitude occupies only one square millimeter on the recording medium 416. That way recorded micro-holograms lie on a spiral, such as. B. in Fig. 5 is indicated.

With a slight modification, the in FIG. 4 can also be used to record colored moving images as micro-holograms. The optical transmitter 400 can in this case, as FIG. 6 shows a helium-neon laser 500 that emits a beam 502 of red light and an argon laser 504 that emits a beam 506 of both green and blue light. The two light beams 502, 506 are combined into a white light beam 508 by a mirror 510 and a semitransparent mirror 512. In the path of this white light beam 508 is, as shown, a rotatable color filter which contains a blue, green and red sector B, R, G. The beam 508 passes through one of the three differently colored sectors depending on the angular position of the filter 514. The light beam 402 emerging from the optical transmitter 400 is then alternately red, green or blue.

For the recording of color image micro-holograms, the method shown in FIG. 4 also shown either according to FIG. 7 a or F i g. 7 b amended. In the case of the amendment according to FIG. 7 a, the shutter 424 consists of three different, vertically arranged shutter units 424-11, 424-12 and 424-13. The shutter 424-11 opens briefly when the red sector R of the color filter 514 is in the path of the light beam 508; the shutter 424-12 opens briefly when the green sector G of the filter 514 is in the path of the light beam 508, and the shutter 424-13 opens briefly when the blue sector of the filter 514 is in the path of the light beam 508. In this way, for each colored frame 440 of the filmstrip

ίο three separate micro-holograms recorded. In in this case, the recording medium 416 is then moved to the next by the drive mechanism 418 Positioned after the three shutters 424-11, 424-12, 424-13 have been opened in sequence were, and the next colored frame of the film is in the path of the diffuse light beam 432 brought, whereupon the sequence described is repeated.

The micro-holograms recorded in this way on the recording medium 416 form one three-flight spiral, d. that is, the micro-holograms of each color lie on a spiral, and the three Spirals are nested one inside the other, as in FIG. 8 is shown.

The closure 424 can, however, as shown in FIG. 7b, three arranged side by side Contain locking units 424-21, 424-22 and 424-23, which are also operated in sequence, as shown on the basis of FIG. 7 a was explained.

In this case the micro-holograms of the different colors lie next to one another, and the groups of three R, G, B corresponding to a single image of the film lie on a single spiral, as shown in FIG. 9 shows.

Another way to produce color micro-holograms of color film is to use instead a colored projection template, i.e. instead of one color image to use three achromatic projection templates, of which the first the red component, the second the green component and the third the blue component Contains scene of the relevant frame. In this case you can record the separated Micro-holograms a single source of any spatially coherent, monochromatic light Wavelength can be used, and the three "separations" can be sequential or simultaneously accordingly F i g. 8 or 9 can be recorded.

After all micro-holograms are on the record carrier 416, which is the mother record If necessary, it is developed to match the individual micro-holograms to form corresponding relief patterns. So if a record carrier is used containing a silver emulsion, the latent image formed upon exposure becomes more common Way developed. It may also be desirable to remove the developed silver from the layer remove or fade, although this is not necessary as the information is contained in each micro-hologram in the case of a developed silver emulsion, apart from in the form of density fluctuations, at the same time is available as a relief pattern. If the recording medium contains a photoresist, it must be developed in the usual way in order to create the relief pattern corresponding to the individual micro-holograms to create. The development of a photoresist is known to be based on the fact that the Solubility of such photoresists in general

is inversely proportional to the illuminance. When using a thermoplastic recording medium you automatically get a corresponding relief pattern for each micro-hologram, so it is no special development required.

The mother micro hologram relief pattern recording is first coated with a thin metal layer, e.g. by vapor deposition in a vacuum, and then a duplicate (son) is made, as is known in record production. Let it be every- ιό but mentions that the information contained in a micro-hologram is always a "positive". this applies regardless of whether the high and low digits in the micro-hologram relief pattern of the duplicate or the print copy high and low or low and high of the mother record correspond. The production of a »son matrix«, as in the production of records, can therefore be omitted.

A one-sided, transparent hologram print copy as shown in FIG. 1 can be represented by a direct or indirect replica of a mother's record in a clear vinyl plastic disc getting produced. To produce the in F i g. 2 shown two-sided hologram print copies of course, two different mother hologram records are used. After pressing both sides of a double-sided hologram copy of the in F i g. 2 using a dimensionally stable material such as a vinyl resin the two surfaces are then covered with a thin, highly reflective metal film, what for example by evaporation in a vacuum, cathode sputtering, spraying on, electroplating and the like. Can happen.

F i g. FIG. 10 shows, in a greatly simplified manner, a device for reading the information in a hologram print copy the in F i g. 1 type of information contained. Such a transparent hologram plate 1000 is attached to a drive mechanism 1002 that allows it to both rotate and slide allowed. A single micro-hologram of the transparent plate 1000 is captured by a beam 1006 spatially coherent monochromatic Liehtes interspersed with, for example, one with stimulated emission operating optical transmitter 1004 is generated. The cross section of the beam 1006 is in no way larger than the area of the micro-hologram to be reproduced, it is preferably slightly smaller than the area of a single micro-hologram, so the mechanical tolerances the facility can be adhered to more easily. The beam 1008 exiting the plate 1000, the contains the information recorded in the relevant micro-hologram is the input a device 1010 for making this information usable.

The device 1010 can take various forms. You can z. B. just a screen or contain a ground glass to reproduce the relay image formed by beam 1008. The device However, 1010 may include any transducer other than that represented by light beam 1008 Converts information into an electrical signal. If z. Those in that scanned by beam 1006 Micro-hologram recorded information consists of binary code characters and for a program-controlled Data processing system is intended, the converter can be a two-dimensional matrix Photocells, which convert the binary information of the light beam into electrical signals, and an an-order contain the electrical signals for processing in the data processing system processed. Other examples of device 1010 are discussed below. The drive mechanism 1002 can adjust the transparent HoIogram plate 1000 so that any of the many micro-holograms pressed into the plate, viewed or evaluated as desired can be.

11 schematically shows a device for evaluating metallized, reflective holographic replicas the in F i g. 2. In Fig. 11, the drive mechanisms correspond 1102, the stimulated emission optical transmitter 1104, beams 1106, 1108 and the structure and function of the device 1110 are denoted by reference numbers that are 100 smaller in each case Elements of Fig. 10. The main difference between those shown in Figs Means is that the beam 1106 is spatially coherent monochromatic light successively through a mirror 1112 and the relief pattern of a micro-hologram to be evaluated is reflected, whereby an information beam 1108 is produced, which through a mirror 1114 to a consumer 1110 is reflected. In contrast, the relief pattern was a micro-hologram at F i g. 10 with the coherent light has been irradiated.

It should be noted that the devices shown in Fig. 10 or 11 do not have a shutter is required. If namely the micro-hologram to be evaluated by moving the hologram plate is changed, takes the one struck by the spatially coherent, monochromatic light beam The surface of the micro-hologram that has just been evaluated gradually decreases, while that of the light beam hit area of the micro-hologram to be evaluated next increases gradually. the The intensity of the information corresponding to the last micro-hologram evaluated thus increases with the Further movement of the hologram plate accordingly. When they are pressed into the plate next to each other Micro-holograms thus correspond to successive individual images of a motion picture sequence the last picture gradually becomes weaker, while the next picture gradually becomes lighter.

If, as is often the case, the information stored in the individual micro-holograms should not be reproduced directly by the light beam containing the information, the device for utilizing the information beam can use an image intensifier 1200 (Fig. 12) from whose photocathode 1202 the light beam containing the information falls. Through this can also with a beam of spatially coherent monochromatic light of relatively low intensity a much brighter image can be produced than would otherwise be possible.

Fig. 13 shows a specific example of an image enhancer. The light beam from the hologram containing the information falls here on a television camera 1300, which is a television pickup tube, e.g. B. contains a vidicon. In the television camera 1300

109 522/271

the information represented by the light beam is converted into a video signal which is transmitted via a Transmission arrangement 1302 is fed to a television reproduction device 1304. The establishment 13C4 contains a picture tube on which the information stored in the scanned micro-hologram is reproduced.

FIG. 14 shows a modification of the device shown in FIG. 13, which is used for reproduction of color images is suitable, which are used in hologram plates of the type shown in FIG. 8 or 9 shown type stored are. The device shown by a dashed rectangle for making the Light information obtained from the hologram recordings is contained in a television camera assembly with three pick-up tubes 1400-i ?, 1400-G, 1400-0 or the like, which have the red, green and blue Image information containing light beam processed by the three related micro-holograms.

When using hologram plates of the type shown in Fig. 8, separate beams, which contain the red, green or blue image information, by simultaneously illuminating a sentence from a »blue«, »green« and »red« micro-hologram spatially coherent with the same beam monochromatic light can be obtained, which can have any wavelength, so not necessarily must be red, green or blue, and that in the radial direction of the hologram plate through a cylinder lens has been widened. On the other hand, the illuminating beam can also be deflected in this way that it illuminates the various micro-holograms of a set one after the other. Of the Proportion of this beam that is produced by the micro-hologram of the containing the red image information Sentence is received, is then, for example, a mirror on the pickup tube 1400-i? that obtained from the micro-hologram of the set containing the green image information The light beam is directed onto the »green« pick-up tube 1400-G, and the same applies to the beam containing the blue image information, which is directed onto the "blue" pick-up tube 1400-ß will.

In a corresponding manner, from a set of micro-holograms of a disk the device shown in FIG. 9 three light beams are obtained, which contain the red, green and blue image information and these beams may, as shown in Fig. 14, be three pick-up tubes of a type of color television camera are fed. When using a plate of the type shown in FIG. 9 shown the three related micro-holograms then form a spatially coherent, monochromatic beam Illuminated light, for example by means of a cylindrical lens, in the circumferential direction the plate has been widened. In this case the camera must be synchronized with the movement the plate from hologram set to hologram set are blanked so that the information of a light beam containing a certain color is not directed to a light beam intended for processing of another color Pickup tube falls.

■ The video signal from the television camera 1400-i ?, 1400-G and 1400-ß is transmitted through a signal transmission arrangement 1402 to a color picture display device 1404, where the three color signals, for example three electron beams from a shadow mask color picture tube Od. Like. Control, which in turn stimulate phosphors of the corresponding color. On the Screen of the tube is displayed accordingly the composite color image, its Color components were stored in the three micro-holograms of a set.

Fig. 15 shows a direct reproduction device of a color image contained in a set of micro-holograms on a transparent plate 1504, FIG. Can match 8 or 9. The light source 100 can here for example optical transmitters that work with stimulated emission contain and deliver three separate beams spatially coherent monochromatic light with the three primary colors, namely a red ray 1502-i ?, a green ray 1502-G, and a blue ray 1502-5. The three rays fall immediately on the micro-holograms containing the red, green or blue image information Set of plate 1504, with a beam 1506- /? Containing the red image information, a green Beam 1506-G containing image information and a beam 1506-2? develop. These three information beams are fed to an optical device 1508 for combining supplied, which may contain lenses and / or mirrors, and the three beams into a single information beam 1512, which focuses on a screen 1514 of the display device 1510 will.

Of course, the in F i g. The display arrangement shown in FIG. 15 corresponding to FIG. 11 is modified in this way that color image micro-holograms of a hologram plate with metallized, reflective Surface can be reproduced.

Claims (15)

Patent claims: 1. Hologram print copy, characterized by a dimensionally stable recording medium, in its surface at least one hologram (104, 204) in the form of a relief pattern is indented with respect to the bottom of the surface, which consists of a number of elevations and There is depressions, the relative position and size of which represent the hologram information. 2. hologram print copy according to claim 1, characterized in that in the surface a plurality of separate holograms (102, 204) are pressed in a regular arrangement. 3. hologram print copy according to claim 2, characterized in that the separate Holograms each occupy an area of the surface that is of the order of magnitude of one Square millimeters. 4. Hologram print copy according to claim 1, characterized in that the recording medium from a flat plate (100) made of an isotropic, transparent material and with parallel there is opposite surfaces, in one of which the holograms are pressed. 5. hologram print copy according to claim 4, characterized in that the plate (100) the Has the shape of a circular disk and that the holograms (104) along a with respect to the center of the Disc-centered spiral are arranged. 6. Hologram print copy according to claim 1, 2 or 3, characterized in that the surface of the recording medium is light as possible fully reflected. 7. hologram print copy according to claim 6, characterized in that the surface with is coated with a highly reflective metal layer. 8. hologram print copy according to claim 6 or 7, characterized in that the recording medium is in the form of a flat plate (200) with parallel opposite sides, both of which are light-reflecting, and each contain at least one hologram consisting of a relief pattern. 9. hologram print copy according to claim 8, characterized in that the plate (200) is a circular disk and that on both sides of the plate in each case a plurality of separate Holograms is arranged and that the holograms on the two sides each on one Spiral, which is centered with respect to the center of the disc. 10. hologram print copy according to claim 9, characterized in that each individual hologram (204, 206) occupies an area of at most one square millimeter. 11. Method of making a hologram print copy according to one of the preceding claims, characterized in that on the surface of a mother recording medium (416) one or more phase holograms are applied as a relief pattern and that the relief pattern of the mother record (416) on the hologram print copy (100, 200, 1000, 1100, 1504) by pressing, pouring or a process with the same effect will. 12. The method according to claim 11, characterized in that the surface of the so produced Hologram print copy after the transfer of the relief pattern with a highly reflective, thin metal layer is coated. 13. The method according to claim 11, characterized in that a recording medium (416) is used, the surface of which is large compared to the area of the individual hologram is that the surface of the recording medium with the exception of the surface area of the individual Hologram corresponding part is covered so that the two for hologram production required light components (410, 442) can only achieve the small part that this part simultaneously with the two light components during a given time interval is exposed, that the recording medium is then moved so that at least one another small part of the recording medium that does not overlap with the first part, can be reached by the two light components and that then this second part during a second time interval is exposed simultaneously with the first and the second light component is, so two separate holograms on the surface of the recording medium to be recorded. 14. The method according to claim 13, characterized in that the first and the second component during the first time interval of light of a first wavelength and during the second time interval consist of light of a different wavelength. 15. The method according to claim 13, characterized in that a first object (440) with Light from the light source (400) is illuminated during the second light component (442) of the first time interval, and that a second object (414) different from the first is illuminated with the light source (400) to the second light component (442) during the second Generate light interval. 1 sheet of drawings