Classifications

• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
  • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
  • G03H1/04—Processes or apparatus for producing holograms

Definitions

• the invention relates to a holographic camera with a laser tube generating a laser light beam and with mirrors.
• Holograms are usually recorded with a laboratory-like structure in darkened rooms, so that their creation is complex and generally only possible for specialists.
• the object of the invention is therefore to provide a hologra ie camera with which holograms can be produced simply and quickly and without special specialist knowledge.
• the laser tube can be attached to the base plate in a simple manner by means of this retaining ring.
• an electromagnet with axially displaceable or confirms pivotable anchor which carries a closure body which is movable between its closed position in front of the outlet opening and its retracted release position.
• a mirror is expediently attached to the base plate behind the closure body in the laser beam axis angularly to the latter, which enables a compact arrangement of the optical elements on the base plate.
• a mirror shaft bounded by a front wall and side walls is held in a recess of the base plate, the vertical center plane of which is essentially aligned with the reflected laser beam and the front wall of which is provided with an opening containing a lens, the axis of which is aligned with the laser beam.
• an object shaft can be provided in the base plate in the direction of the laser beam, which is closed by a removable film box, the bottom of which faces the object shaft and is provided with holders for a light-sensitive film or plate and guides for the cassette slide covering it and whose side facing the mirror shaft is open.
• At least two mirrors can be held in the mirror shaft, which reflect the laser light beam diverging through the lens onto the bottom of the object shaft, the laser light beam passing through the bottom of the film box.
• so-called white light holograms of objects placed on the floor of the object shaft can be recorded. All parts required for the recording of the hologram are connected to the base plate, which is held in the housing in a vibration-damped manner.
• the hologram recordings destroying or preventing vibrations which still act on the housing are therefore not transmitted to the base plate at all or only in a damped and therefore rapidly decaying manner.
• the laser tube and all other optical elements are arranged relative to one another in the manner required for the recording, so that even a layperson can produce a hologram of an object inserted into the object shaft.
• a beam splitter is arranged on the base plate between the mirror and the objective, which beams a partial beam at right angles through an opening in the base plate on a mirror attached to the base plate underneath and which parallel this partial beam
• the partial beam just passing through the beam splitter is reflected on a second opening in the front wall of the mirror shaft provided with a second objective, that the film box with a film or plate on top with a light-sensitive layer is placed on the object shaft and the bottom of the film box is the carrier plate forms for the object and that another mirror is arranged in the mirror shaft below the plane of the base plate, which reflects the partial beam diverged by the second lens as a reference beam onto the wall of the film box located above.
• This embodiment of the holographic camera according to the invention enables the recording of laser light transmission holograms.
• guides are provided in the mirror shaft for a plate covering the lower mirror. Will in this Guides inserted a sheet metal plate or a plate made of other absorbing material, the reference beam divided by the beam splitter is absorbed, so that only the partial beam just passing through the beam splitter is used for receiving white light reflection holograms of the Lippmann-Bragg type.
• holders for a mirror are provided in the mirror shaft and / or the film box, which reflect the object beam passing through the upper object onto the wall of the film box lying above.
• This embodiment of the invention makes it possible to insert the previously recorded hologram instead of the film or the plate with the light-sensitive layer in the upper wall of the film box and to reconstruct it with the object beam used in the recording as a reference beam.
• the beam splitter has, for example, a beam splitter ratio of 70:30, the partial beam of greater intensity forming the object beam. If the object beam is used as the reference beam for the reconstruction, the result is a brighter reconstructed image.
• the base plate expediently consists of a multi-layer plate made in a sandwich construction. Such a plate has a better vibration-damping behavior.
• the base plate is expediently supported by oscillating metal elements on brackets connected to the housing.
• the vibrating metal elements can preferably consist of two angle pieces, the legs of which are angled at 45 ° relative to one another, one leg being connected to one another by a glued-on or vulcanized block of rubber or elastomeric material and the other leg on the one hand are attached to the base plate and on the other hand to the housing.
• the angles of the angle pieces point in opposite directions.
• the retaining rings expediently grip the laser tube with play, three retaining screws being screwed into the circumferential circumference in radial threaded bores.
• This type of holder allows both rotation of the laser tube about its longitudinal axis to adjust the polarization and pivoting about the longitudinal axis, so that adjustment in all six degrees of freedom is possible.
• the mirror which is arranged essentially at right angles to the base plate is held on a base which has a holding surface which is perpendicular to the base plate, that the holding surface and that which is glued to the mirror or otherwise connected to it
• Retaining plate are provided with grooves parallel to the base plate, into which a roller-shaped body is inserted, and that retaining screws are passed on both sides of the roller-shaped body through bores in the retaining plate and screwed into threaded bores in the retaining surface.
• the base expediently has an extension provided with a thread, which extends through the base plate in a 3-hole and is held therein by nuts screwed against one another.
• the mirror can be adjusted in the other plane by appropriate rotation.
• the Thread mount a height adjustment of the mirror.
• the beam splitter consists of a plate made of refractive material, which is glued to a frame-like plate with a central recess, the frame-like plate by three screws on an upper end face of a tubular support body, which is bevelled by 45 ° to its central axis , is held adjustable, wherein the holding body has a lower, through the base plate in a bore cylindrical part, which has a 45 ° beveled end face on which a mirror is held adjustable by three screws, and wherein the jacket of the tubular holding body in each case is provided with radial openings on its side opposite the beam splitter and the mirror.
• the cylindrical part is expediently held on the base plate by clamping rings. These can consist of pushed-on rings with radially screwed-in retaining screws.
• a tilt-proof fixing of the film box to the base plate is expediently achieved by a three-point bearing on the base plate and the mirror shaft.
• the top and bottom of the film box consists of a glass pane pressed against the edge strips by springs, against which an articulated pane can be folded from the outside and can be locked with it in its folded position , and that the guides for two cassette slides are provided on both sides of the discs.
• a potentiometer is expediently provided on the housing cover to adjust the exposure time.
• the control electronics sets the respectively set resistance in an analog exposure time.
• the closure body is moved away from the opening of the laser tube via the electromagnet.
• the laser beam is expediently released only after a delay time, during which any vibrations generated by the actuation of the device have subsided.
• Fig. 1 is a plan view of the holography camera with the cover plate removed and
• FIG. 2 shows a section through the holography camera along the line A-B in FIG. 1.
• the holographic camera has a cuboid housing " 1, which is made of sheet metal and has a rectangular cross section in plan view.
• the housing 1 is closed in a light-tight manner by a cover 2 which is screwed onto the side walls of the housing 1 and also with Parts of the side walls can be connected.
• Opposite side walls of the housing 1 are screwed with angle pieces 3, on which a base plate 5 is mounted via a vibrating metal bearing 4. There is a gap 6 between the side walls of the housing 1 and the base plate 5, so that vibrations cannot be transmitted directly from the side walls to the base plate 5.
• two holding rings 7, 8 are glued at a distance from one another, which are distributed over their circumference with three radial threaded bores into which holding screws 9 are screwed.
• the laser tube is in the retaining rings 7, 8 10 inserted with play.
• the laser tube 10 is held in the retaining rings 7, 8.
• the laser tube 10 is held on the base plate 5 in the manner shown in FIG. 1 approximately diagonally.
• an electromagnet 11 is fastened on the base plate 5, which is provided with an axially displaceable armature, which carries at its free end a disk-shaped closure plate 12, which is removed from it by the electromagnet 11 the closed position of the outlet opening of the laser tube 10 is retractable into its open position.
• a mirror 14 which is adjustable about intersecting axes and is essentially perpendicular to the base plate 5, is fastened thereon.
• the mirror 14 reflects the laser beam 15 in a direction parallel to the side walls.
• the laser beam 15 reflected by the mirror 14 passes through the beam splitter 16.
• the beam splitter 16 divides the laser beam 15 into a beam 15 'which passes straight through it and a partial beam 15' 'reflected at right angles through an opening in the base plate 5.
• the beam splitter ratio between the beams 15' and 15 '' is, for example 70: 30.
• the partial beam 15 ′′ reflected through the opening of the base plate 5 is reflected by a mirror 17 attached to the base plate 5 in a direction parallel to the partial beam 15 ′.
• a mirror shaft 18 is connected to the base plate and consists of side walls 19, 20 and a front wall 21 connecting them.
• the rear of the mirror shaft 18 is open.
• the two partial beams 15 ′, 15 ′′ formed by the beam splitter 16 are located in the vertical central plane of the mirror shaft 18.
• the object shaft 23 which is formed by a rectangular recess in the base plate 5 and has a lower base 24, which is located just above the base plate of the housing 1.
• the object shaft 23 is closed by an attached film box 25, which has a cuboid housing and the wall facing the film shaft 18.
• the housing cover also has a rectangular cutout, which is closed by the upper cover wall of the film box 25.
• the film box 25 has a closed top wall and an opposite top wall, which consists of a glass plate with a hinged glass plate, the film, the plate or foil with the light-sensitive layer being insertable between the two glass plates.
• the two glass plates have guides on both sides for cassette slide.
• the front wall 21 of the film shaft 18 is provided with two superimposed openings 28, 29, in which lenses consisting of converging lenses are arranged.
• the partial beams 15 ', 15 "enter through these openings 28, 29 and the associated objectives in the mirror shaft 18.
• a central mirror 30 is arranged in the mirror shaft, which horizontally passes the partial beam 15' entering through the opening 28 to an upper one arranged mirror 31 is reflected from this mirror 31, the diverging partial beam 15 'falls on the bottom 32 of the film box 25.
• a mirror 35 is arranged in the mirror shaft 18 in the beam path of the lower partial beam 15 ", which reflects the divergent partial beam 15" to the cover plate 36 of the film box 25.
• a cover is provided in lateral guides above the mirror 25 arranged below the base plate 25 in the mirror shaft 18.
• plate 40 slidable.
• a horizontal mirror 41 is arranged in the mirror shaft or in the film box 25, which mirror that of the mirror
• the lower mirror 35 is covered by the plate 40 inserted into the mirror shaft 18.
• the object 50 to be recorded is placed on the floor 24 of the object shaft 23.
• the object 50 is illuminated by the diverging partial beam 15 ′ reflected by the mirrors 30, 31.
• This partial beam 15 'passes through the film with light-sensitive layer inserted into the bottom of the film box 25.
• the rays reflected from the object 50 form the object rays, while the rays passing through the film form the reference beam.
• the white light reflection hologram is recorded using a method known as in-line holography or Denisyuk holography.
• the white light hologram can be reconstructed with daylight because it was recorded with standing waves in the manner described.
• the device described can also be used to produce laser light transmission holograms of objects.
• the plate 40 inserted over the mirror 35 is removed.
• the film box 25 is turned over so that the film with the light-sensitive layer is held in the upper cover plate 36 of the film box 25.
• the object to be recorded is placed on the floor
• the partial beam 15 ' which reflects onto the object via the mirrors 30, 31. is inflected.
• the reference beam is formed by the partial beam 15, which is reflected by the mirror 35 onto the film held in the cover plate of the film box 25.
• the device described can also be used for the reconstruction of laser light transmission holograms.
• the mirror 41 is inserted and the hologram is inserted between the glass plates of the cover plate of the film box 25 instead of the film. After switching on the laser 10 and removing the cassette slides, the hologram is reconstructed with the object beam as the reference beam.
• holograms can also be arranged in the film cassette 25, so that holograms of holograms or copies of holograms can be produced.
• the power supply 60 for the laser is arranged on the base plate of the housing 1. Furthermore, the electronic control 61 of the device is attached to the base plate. The electrical connections are made by cables and plugs. The operating buttons are arranged on the cover plate of the housing and are likewise connected to the base plate by cables and plug connections.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Holo Graphy (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6795650

Family Applications (1)

Country Status (4)

Cited By (1)

Family Cites Families (4)

• 1986
  • 1986-06-18 DE DE19868616335 patent/DE8616335U1/de not_active Expired
• 1987
  • 1987-06-16 EP EP19870905724 patent/EP0275308A1/de not_active Withdrawn
  • 1987-06-16 WO PCT/EP1987/000314 patent/WO1987007964A2/de not_active Application Discontinuation
  • 1987-06-16 JP JP50533087A patent/JPH01501254A/ja active Pending

Non-Patent Citations (1)

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