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WO1990002969A1 - Dispositif pour devier un faisceau lumineux - Google Patents

Dispositif pour devier un faisceau lumineux Download PDF

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Publication number
WO1990002969A1
WO1990002969A1 PCT/EP1989/001032 EP8901032W WO9002969A1 WO 1990002969 A1 WO1990002969 A1 WO 1990002969A1 EP 8901032 W EP8901032 W EP 8901032W WO 9002969 A1 WO9002969 A1 WO 9002969A1
Authority
WO
WIPO (PCT)
Prior art keywords
deflector
deflection
light beam
deflection device
crystals
Prior art date
Application number
PCT/EP1989/001032
Other languages
German (de)
English (en)
Inventor
Klaus Kinzinger
Original Assignee
Klaus Kinzinger
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Klaus Kinzinger filed Critical Klaus Kinzinger
Publication of WO1990002969A1 publication Critical patent/WO1990002969A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/29—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the position or the direction of light beams, i.e. deflection
    • G02F1/33—Acousto-optical deflection devices

Definitions

  • the invention relates to a device for deflecting a light beam, in particular for use in a large-area display device according to the preamble of claim 1.
  • Known large-area display devices are e.g. used in discotheques for projecting geometric patterns on walls, ceilings or free-standing screens.
  • the deflection device contains deflectors in the form of mirrors for the two beam deflection directions, which can in principle be adjusted according to the moving coil.
  • Display devices are not dependent on accuracy and very high speed of the display; the information content of the projected patterns is small.
  • Monitors, LCD displays and plasma displays are also known for the representation of letters, numbers and drawings, which can also display rapidly changing information with a high information content, e.g. continuous texts or complex technical drawings.
  • Large-scale display panels are also known which operate in a similar manner to the monitors and displays just described. Only in these display panels are the individual display elements formed by individual lamps or mechanically adjustable flaps. Such large-scale display boards can be found, for example, in football stadiums. These scoreboards have the disadvantage that they work slowly compared to monitors not suitable for displaying rapidly changing information. In addition, these large-scale display boards are very expensive, which excludes their use in purely technical applications, for example in control rooms and the like.
  • the present invention is intended to develop a deflection device in accordance with the preamble of claim 1 in such a way that it is suitable for such operating conditions.
  • Deflector crystals such as acousto-optical deflector crystals, which can be controlled locally in terms of their optical refractive power by means of electrical signals, bring with them a side effect of dynamic distortion of the light beam, as would also be produced by a weak cylindrical lens.
  • This effect is due to the fact that in the deflector crystal the wavelength of the refractive power fields is not the same throughout, but rather varies locally since the working frequency has to be varied in order to deflect the light beam. With the development of the invention according to claim 3 it is achieved that this disturbing cylindrical lens effect is eliminated, since a corresponding positive effect in the first deflector crystal is offset against an opposite effect in the second deflector crystal.
  • the development of the invention according to claim 4 also serves to increase the deflection angle.
  • the development of the invention according to claim 5 is advantageous in terms of producing the smallest possible light spots when the light beam strikes a screen.
  • the deflection device or the light source is automatically switched off or in a standby state when a person is in a place where they could be hit directly by the light beam emitted by the deflection device.
  • This monitoring of the space possibly traversed by the light beam can be carried out according to claim 7 simply by using known monitoring devices, such as are used for theft protection and burglar protection.
  • a monitoring device as specified in claim 8, is characterized by a particularly simple and cost-effective design: the space to be monitored is scanned by the light beam which is also used for display purposes together with a light guide running at the edge of a screen, in that the light beam is inside a test cycle is moved along the light guide arrangement. With this test movement there is only a slight risk of injury to one to be monitored Person in the room because the light beam is moved quickly here. If desired, the light source power can also be reduced for the test cycle (cf.
  • the monitoring device specified in claim 8 can also be used to calibrate the deflection device: if it is known that there is no obstacle in front of the light guide arrangement, the lack of an output signal on the light-sensitive detector C when the detector is working properly can only mean that the light beam passes through the deflection unit , whose control unit or a computer controlling it is not correctly guided over the light guide arrangement. If the control of the deflection device is then modified so that the light beam runs correctly over the light guide arrangement, the deflection device is also correctly adjusted overall.
  • This equalization of the generated image is obtained in a mechanically particularly simple manner.
  • a continuously rotating disc-shaped equalizing element also runs quietly.
  • the arrangement of the equalization element within the optics in front of the last lens of the latter (cf. claim 13) is advantageous in terms of avoiding a pixel widening.
  • the refractive power fields in the deflector crystals can be electrically inclined so that the end faces of the deflector crystal can be placed perpendicular to the incident light beam. This is advantageous with regard to undesired reflections from the end face of the deflector crystals.
  • Angle of attack to the incident light beam is changed according to the deflection control signal.
  • the materials that can be used for deflector crystals are usually optically anisotropic anyway, the diffraction of the light beams at the refractive power fields also results in a rotation of the polarization with respect to the incident light beam, so that the undesired orders of the diffracted can be obtained in a very simple manner Hide light beam or at least weaken it strongly.
  • Figure 1 a schematic representation of a large area
  • Figure 2 a plan view of a modified screen for the laser display panel of Figure 1;
  • Figure 3 is a schematic representation of one of the deflector units of a laser display panel
  • Figure 4 is a schematic representation of a modified deflector unit for a laser display panel
  • Figure 5 is a schematic representation of a further modified deflector unit for a laser display panel, which comprises a three-lens zoom lens;
  • FIG. 6 a view similar to FIG. 5, with an additional polarizer for blanking out the zero and second orders of the diffracted laser beam;
  • FIGS. 7a and 7b a modified arrangement for generating the refractive power fields in the deflector crystals with different angles of attack
  • Figure 8 is a schematic representation of a modified
  • Defector unit with several defector crystals arranged one behind the other.
  • 10 denotes a screen on which rapidly changing information is to be displayed with high resolution.
  • the screen is usually rectangular and can e.g. are 4 m wide in the x-direction and 3 m high in the y-direction (room dividers as control room display boards) or larger (projection on house wall).
  • Directions refer to the coordinate systems shown in Figures 1 and 2.
  • Information is displayed on the screen 10 by moving a laser beam 12 according to the information to be displayed on the screen 10.
  • a corresponding deflection unit is identified by a total of 14 in the drawing. It receives the laser beam from a laser 16, which generates light in the visible range.
  • Umbrella 10 from 4 m to 3 m.
  • the laser light emerging from the widening optics 17 reaches a deflector unit, designated overall by 26, which comprises a ⁇ deflector unit 26 ⁇ and a y deflector unit 26y. These deflect the laser beam by a predetermined angle in the x-direction or y-direction from the optical axis of the laser 16 denoted by 28.
  • the deflector units 2 ⁇ x and 26y contain acousto-optical deflector crystals as active elements, for example TeO 2 single crystals.
  • the maximum deflection angle that can be achieved with them is approximately 2.5 degrees.
  • the light emitted by the deflection unit deflector unit 26 passes through an equalizing disc 18 which rotates about an axis parallel to the beam direction and whose local refractive power (refractive index integrated via the
  • the shaft carrying the equalization disk 18 also carries a pinion 20 which meshes with a large gear wheel 22.
  • the latter is driven by a synchronous motor 24.
  • an objective 30 is provided which increases the beam deflection.
  • the information to be displayed on the screen is provided by a computer 32. This information can be entered via a terminal 34 if such a direct information display is desired.
  • Computer 32 can, however, also cooperate with other signal sources, e.g. with a computer for which the display panel represents an output unit, or with sensors 36, 33, 40, which are used, for example, to monitor a chemical reactor or to monitor a production line or the like.
  • the computer 32 can then process the output signals of these sensors, compare them with target values and issue warnings in the event of deviations from the target values according to predetermined criteria, or also provide the sensor output signals or variables derived from these in the form of graphics for the user.
  • a process computer 42 cooperates with the computer 32 and controls voltage-controlled oscillators 44x, 44y on the output side. Their outputs are via power amplifiers 46x, 46y with the control terminals of the deflector units 26x and 26y vsrbunden.
  • the oscillators 44x, 44y are voltage-controlled oscillators with a center frequency of the order of 100 MHz and a frequency swing of about 50 MHz.
  • the oscillator output voltages amplified by the power amplifiers 46x, 46y generate sound waves of corresponding frequency in the deflector crystals of the deflector units 26x and 26y, at which the laser beam is diffracted for the purpose of deflection, as will be described in more detail.
  • the process computer 42 works together with a read-only memory 48, in which the most important corrector and work values are stored. These are, in particular, factors v x and v y for converting the desired coordinate deflections in the x and y directions on the screen 10 into associated deflection angles of the laser beam 12. Furthermore, the parameters P x and P y specifying the point size are stored in the read-only memory 48. Taking this into account
  • the process computer 42 additionally modulates the control voltages for the oscillators 44x and 44y.
  • the entire control unit which is inserted between the computer 32 and the deflection unit 14, bears the reference number 50 in the drawing.
  • the laser beam 12 is moved for a long time within a small portion of the screen 10. If there were a person in the area between the projection unit 14 and the screen 10, there could be a risk of injury. For this reason, this area is monitored by an ultrasonic sensor 54, as is otherwise used for room monitoring in burglar alarms. It is connected to a detector circuit 56, which then generates an output signal when the ultrasonic sensor 54 detects the presence of a person in the space between the projection unit 14 and the screen 10.
  • the process computer 42 When the process computer 42 receives an output signal from the detector circuit 56, it controls the deflection unit 14 independently of the information received from the computer 32 and to be displayed in such a way that the laser beam 12 is guided along the edge of the screen 10 at high speed. This means that only a very small fraction of the laser power hits a person standing in the area to be monitored. Alternatively, the output signal of the
  • detector circuit 56 uses the detector circuit 56 to turn the laser 16 off or to decrease its power or to control a shutter or beam attenuator provided in the deflection unit 14.
  • the process computer 42 operates in a manner similar to that which is known per se from the control of graphics terminals. Only characteristic points of the overall pattern to be generated are input to the process computer 42. It then calculates any desired connecting lines according to predetermined interpolation formulas and / or generates certain, often recurring patterns at the selected points, for example letters or frequently required graphic symbols, which are also stored in the read-only memory 48. It can be seen that characters, drawings, graphics and other information can be displayed very quickly, very variably and over a large area in the manner described above.
  • FIG. 2 shows an alternative for monitoring the space between the deflection unit 14 and the screen 10.
  • a light guide 58 is provided along the edge of the screen 10.
  • a photodetector 60 faces the mutually adjacent ends of the light guide 58 which extend beyond the screen 10 on the same side. This thus responds when one end or the other of the
  • Light guide 58 light emerges. Such a light emission is obtained when the laser beam 12 is guided exactly along the light guide 58 by appropriate control of the deflection unit 26. If there is an obstacle in the volume of space to be monitored, which the laser beam 12 can also sweep as far as possible when information is displayed, a signal drop is observed at the output of the photodetector 60. This falling signal edge is passed via an inverter 62 to the set terminal of a bistable multivibrator 64. The latter is reset by the process computer 42 via a line 66 at the beginning of a test cycle, within which the laser beam is guided via the light guide 58, and the state of the bistable flip-flop 64 is queried by the process computer via a line 68 at the end of the test cycle.
  • the process computer 42 receives a signal from the "1" output of the flip-flop 64, the normal display is interrupted and switched to the ready position in the manner described above.
  • the process computer 42 is programmed in such a way that it carries out such test cycles at regular intervals, for example every second, the interval between the test cycles being higher with a small laser power and with a larger laser power is chosen smaller.
  • an output signal from the bistable multivibrator 64 indicates that the laser beam 12 is not correctly guided along the light guide 58.
  • FIG. 3 shows details of the deflector unit 26y.
  • Deflector unit 26x is constructed analogously. The incident
  • Laser beam 12 is first deflected by a prism 96 from the optical axis 28.
  • the deflected laser beam strikes an acousto-optical deflector crystal 1 98, which can, for example, be a plane-parallel cut piece of a TeO 2 single crystal.
  • a piezoelectric ultrasound generator 100 or an ultrasound absorber 102 is applied to the end faces of the deflector crystal 98.
  • the ultrasonic generator 100 is excited by the power amplifier 46y, as explained above with reference to FIG. 1.
  • the deflector crystal 1 98 If the deflector crystal 1 98 is not subjected to ultrasound waves, it behaves like a plane-parallel transparent disc, the laser beam 12 passes through it
  • Deflector crystal 98 essentially rectilinear (apart from a small parallel offset, which is not shown here for the sake of clarity). If the ultrasonic generator 100 is excited by the power amplifier 46y, a sound wave field 104 is obtained in the volume of the deflector crystal 98. The optical refractive index in the detector crystal 98 is periodically modulated by this, and a large number of optical reflection planes are thus obtained. If the Bragg condition is fulfilled, the partial waves reflected at the individual refractive index extreme value planes like one another, while the partial waves passing through largely cancel themselves out, and overall a reflected laser beam is obtained, which is denoted in FIG. 3 by 12 '.
  • the distance between the maxima and minima of the optical refractive index generated by the sound wave field 104 can be varied, and hence the angle of reflection between the reflected laser beam 12 ′ and the incident laser beam 12.
  • a second deflector crystal 106 is arranged in the beam path behind the deflector crystal 98.
  • the deflector crystal 106 again carries an ultrasonic generator 108 on its one end face, which is connected to the output of the power amplifier 46y.
  • the other end face of the deflector crystal 106 carries an ultrasound absorber 110.
  • a sound wave field 112 is generated in the deflector crystal 106, which, however, runs in the opposite direction with respect to the laser beam as the sound wave field 104.
  • interference effects are associated with the reflection of the laser beam at a refractive index field generated by a wave field for the two
  • Deflector crystals 98 and 106 averaged out overall.
  • the deflector crystals le 98 and 106 are identical in terms of their beam deflecting effect.
  • the deflector crystal 106 is rotated through 180 ° with respect to the laser beam and its axis encloses an angle with the axis of the deflector crystal 98. With the deflector unit shown in FIG. 3, the deflection angle of the laser beam is thus doubled overall. This deflection angle is typically about 2.5 ° for a single deflecting crystal.
  • FIG. 3 shows a deflector unit 26x or 26y, which is similar to that according to FIG. 3.
  • FIG. 5 shows a section of the one shown in FIG Deflection unit for the special case that the lens 30 consists of three lenses 116, 118, 120, the lens 116 by the distance 1 1 from the center of the deflector crystal
  • Lens 116 is removed and lens 120 is the distance 13 from lens 118.
  • the focal lengths of these lenses are f 1 , f 2 and f 3 .
  • FIG. 5 shows that the equalizing disc 18 is interleaved with the lenses 116, 118, 120 of the objective 30, specifically in such a way that the lens 120 forms a sharp image of the beam passage point through the equalizing disc on the screen 10. If the screen is at a large distance from the deflection unit 14, this corresponds to
  • FIGS. 5 and 6 show only a single deflector crystal; in reality you have to take the overall arrangement of everyone in its place
  • Deflector crystals of the deflector units 26x and 26y think, the central plane of the overall arrangement then at the
  • the two-lens expansion optics 17 is arranged in front of the deflector crystal 98.
  • the distance from the deflector crystal 98 is denoted by 1 0 and is selected such that at the center of the detector crystal 98 (in the case of a plurality of detector crystals and a plurality of deflector units arranged one behind the other: at the center plane of the deflection unit) a waist of the detector crystal 98 (in the case of a plurality of detector crystals and a plurality of deflector units arranged one behind the other: at the center plane of the deflection unit) a waist of the
  • Laser beam lies.
  • the widening optics 17 is also set so that its focal point also coincides with the center plane of the detector crystal arrangement. In this way, a minimal cross section of the laser beam is obtained overall behind the lens 30.
  • FIG. 5 wherein at the output of the deflector crystal 98, in addition to the laser beam 12 'diffracted in the zero order and the laser beam 12' 'diffracted in the first order, a laser beam 12' '' diffracted in the second order is also reproduced.
  • a laser beam 12' '' diffracted in the second order is also reproduced.
  • the laser beam 12 ′′ is to be used to generate the image on the screen 10.
  • a prism 124 is provided to mask out the beams 12 'and 12' '' that are not used, which preferably is a
  • ultrasonic generators are expediently constructed from a plurality of oscillators arranged next to one another, so that the sound field inside the deflecting crystal receives a certain rotation. In this way it is achieved that the laser light always finds a partial wave of the sound field, at which it is reflected.
  • the rotation of the sound field can be e.g. via the phase shift between the signals to excite the various ultrasonic transducers.
  • FIG. 7 shows a corresponding excitation of the refractive power fields in the deflector crystal 98.
  • two ultrasonic generators 100a and 100b are provided at a distance from the lower end face of the deflector crystal 98, one of which directly with the output signal of the assigned power amplifier 46 is connected while the other this signal via a controllable
  • Phase shifter 126 receives. Due to the resulting phase shift between the sound waves generated by the ultrasonic generators 100a and 100b, the wavefronts in the deflector crystal 98 are tilted, as shown schematically in FIG. 11a with the simplified assumption of flat wavefronts (in the near field of the ultrasonic generators 100a and 100b one has in reality, of course, more complicated forms of the wave fronts).
  • the phase shifter 126 contains a computing circuit 128 which, taking into account the respective deflection angle (and thus the wavelength of the sound wave generators generated by the ultrasound generators 100a and 100b), calculates the necessary angle of attack of the sound wave fields for the direction of the incident laser beam and determines the phase shift with which the Ultrasonic generator 100b must be excited. Since the deflection angles can change very rapidly in the large-area laser display panel under consideration here, an analog arithmetic circuit or a read-only memory is preferably used as arithmetic circuit 128, in which the various arithmetic results have previously been stored for all control signals that can be considered, similar to the above in a different context
  • FIG. 7a shows the conditions for a first control signal output by the process computer 42, which is equally applied to the frequency-controllable oscillator 44 and the electrically controllable phase shifter 126.
  • a sound wave field 104 and a corresponding refractive power field having wave fronts are obtained in the deflector crystal 98, the wavelength of which is relatively large and the angle of incidence relative to the horizontal direction of incidence of the laser beam is relatively small.
  • FIG. 7b shows the situation with another of
  • Process computer 42 emitted control signal, by means of which in the deflector crystal 98 a refractive power field with a shorter one
  • Wavelength and steeper angle of attack to the direction of the incident laser beam is generated.
  • the deflection angle can be multiplied by connecting equivalent deflector crystals in series.
  • geometrically identical diffraction ratios of the laser beam in the deflector crystals 98 and 106 were ensured by tilting the rear deflector crystal 106 accordingly.
  • the deflector crystals 98 and 106 can also be set up in the same orientation and by appropriate ones
  • a lens 130 is arranged behind the first deflector crystal 1 98 in such a way that its focal point is in the central plane of the lens
  • Deflector crystal les 98 falls.
  • the lens 130 thus converts the laser beams 12-0, 12-1 and 12-2 found behind the deflector crystal 98 into axially parallel beams.
  • second lens 132 is arranged in front of the second deflector crystal 106 so that its center falls in the crystal center plane.
  • the laser beam thus intersects the optical axis at the center of the deflector crystal 106 at an angle which corresponds to the amount at which it is deflected away from the optical axis in the deflector crystal 98. If one designates this angle with w, the fronts of the sound wave field 104 run underneath one
  • the wave fronts of the sound wave field 112 must be inclined by an angle of minus 1.5 w to the optical axis. As shown in Figure 8, the deflector crystals are
  • the oblique positioning of the refractive power fields 104 and 112 takes place through a phase shift between the electrical signals with which the ultrasound generators 100a, 100b or 100a 'and 100b' are excited. These different phase shifts for the ultrasonic generators 100b and 100b 'generate the computing circuits 128 and 128', respectively, which belong to the controllable phase shifters 126.
  • the laser beam leaving the deflector crystal 106 is thus tilted in total by the angle 2 w against the starting direction.
  • the lenses 130 and 132 rotate the beam a total of 180 ° about its axis, which has no serious consequences for the purpose of information display even if the beam cross-section deviates from the exact circular shape.
  • the incident laser beam in the deflector crystals 98 and 106 at the refractive power field 104 or 112 is not only diffracted in the first order, but rather also in the second and higher order
  • the beams of different orders are tilted by different angles by a given control signal in the deflector crystals, but only one point of impact of the laser beam is desired on the screen 10 for each control signal, the beams must not be of the desired order (here: zero order and second order) be eliminated.
  • this is done by an aperture plate 134 which is arranged in the middle between the lenses 130 and 132.
  • the aperture plate 134 has an opening 136, the inner edge of which is still above the optical axis, so that the zero-order beam is retained.
  • the upper edge of the opening 136 is selected such that the second-order beam with a minimum deflection angle occurring during operation for the first-order beam (this must be from
  • Beam path which represents the angle ratios much exaggerated in practice, was assumed, for example, that the beam of the first order behind the deflector crystal 98 is tilted a maximum of 20 ° away from the optical axis.
  • Breakthrough 136 can pass, the deflection angle must obviously not be less than the angle of 20 °. Simplifying a linear relationship between the
  • Fig. 8 shows one for the sake of clarity
  • Deflector unit for one coordinate The deflector unit for the second coordinate can be easily integrated into the deflection unit shown, that the first
  • Deflector crystal of this unit in front of the deflector crystal 98, the second deflector crystal symmetrically
  • the opening 136 is given a similar contour in the direction perpendicular to the plane of the drawing as in the plane of the drawing and thus has the overall shape of a rectangle.
  • the lenses 130 and 132 shown in FIG. 8 can be made of
  • Be lenses preferably aspherical lenses.
  • holographic lenses or diffraction gratings instead, the latter changing the distance of the bitter lines from the center axis to the outside, as is necessary to correct the chromatic aberation.
  • a laser 16 is provided as the light source for the display panel. It goes without saying that a conventional white light source can also be used in Can use connection with a color filter, such as a xenon high pressure lamp.
  • the above description also describes only a monochrome, large-area laser display panel together with its control electronics. It goes without saying that it is also possible to produce large-area color laser display panels, whereby the light source used is either a laser that provides multiple wavelengths (e.g. white light crypton ion laser, argon ion laser), or pump lasers in conjunction with a dye cell . The different color laser beams can then be deflected simultaneously by associated deflection units and then meet to form mixed colors on the screen. Alternatively, it is also possible to provide only a single deflector unit which is used in the time-division multiplex method for the laser beams of different wavelengths. In the exemplary embodiments described above, the space between the laser and the screen was monitored using one at the edge of the
  • Shielded light guide at the ends of which light-sensitive detectors were arranged. It goes without saying that a large number of light-sensitive detectors can be used instead, which are arranged at a distance in succession along the edge of the screen and are connected in an OR circuit to a common signal line. For many applications, ss is also sufficient if the security check for the presence of people in front of the screen is only carried out at the lower edge of the screen.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lasers (AREA)
  • Liquid Crystal (AREA)

Abstract

Un laser (16) sert de source lumineuse pour un tableau d'affichage laser à grande surface. Une unité de déviation (14) est connectée en aval dudit laser et commandée par un ordinateur (42) à l'aide de signaux du type servant généralement à produire des graphiques vectoriels sur des moniteurs. L'unité de déviation (14) comporte des unités de déflexion (26x, 26y) comprenant chacune deux cristaux de déflexion dans lesquels sont générés des champs de réfringence opposés dépendant du signal de commande de déflexion extérieur. Un objectif (30) est en outre prévu dans l'unité de déviation (14); il agrandit la déviation de faisceau avant l'impact du faiscau laser sur un écran (10).
PCT/EP1989/001032 1988-09-08 1989-09-05 Dispositif pour devier un faisceau lumineux WO1990002969A1 (fr)

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Application Number Priority Date Filing Date Title
DEP3830455.4 1988-09-08
DE19883830455 DE3830455A1 (de) 1988-09-08 1988-09-08 Grossflaechige anzeigeeinrichtung

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WO1990002969A1 true WO1990002969A1 (fr) 1990-03-22

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0935150A1 (fr) * 1998-02-09 1999-08-11 LDT GmbH & Co. Laser-Display-Technologie KG Dispositif de balayage, son utilisation et système vidéo
DE10049296B4 (de) * 2000-08-03 2013-06-20 Leica Microsystems Cms Gmbh Optische Anordnung und Verfahren zur Ablenkung eines Lichtstrahls

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR950007875B1 (ko) * 1991-01-30 1995-07-20 삼성전자주식회사 레이저를 이용한 표시장치
DE19543067A1 (de) * 1995-11-11 1997-05-15 Matschke Wolfgang Dipl Ing Verfahren und Vorrichtung zur Projektion von Bildern
DE19723208A1 (de) * 1997-06-03 1998-12-10 Ldt Gmbh & Co Vorrichtung zum Intensitätsmodulieren eines Lichtbündels, ein Herstellungsverfahren für diese, ein Verfahren zum Intensitätsmodulieren eines Lichtbündels sowie Verwendungen von der Vorrichtung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3531184A (en) * 1968-06-17 1970-09-29 Zenith Radio Corp Monochromatic light beam deflection apparatus having two trains of frequency scanned acoustic waves for effecting bragg diffraction
US3713721A (en) * 1972-02-14 1973-01-30 Zenith Radio Corp Polarized light beam scanning with improved angular resolution
JPS63194236A (ja) * 1987-02-09 1988-08-11 Anritsu Corp 光偏向装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4251806A (en) * 1980-01-23 1981-02-17 Mcnaney Joseph T Message character image projection control system
US4620230A (en) * 1984-09-24 1986-10-28 The Boeing Company Display system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3531184A (en) * 1968-06-17 1970-09-29 Zenith Radio Corp Monochromatic light beam deflection apparatus having two trains of frequency scanned acoustic waves for effecting bragg diffraction
US3713721A (en) * 1972-02-14 1973-01-30 Zenith Radio Corp Polarized light beam scanning with improved angular resolution
JPS63194236A (ja) * 1987-02-09 1988-08-11 Anritsu Corp 光偏向装置

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Laser Display Technology, August 1975, A. FUKUMOTO et al.: "Laser Display Systems - They're not Practical yet but their Acousto-Optic Beam Deflectors are", seiten 40-43 *
PATENT ABSTRACTS OF JAPAN, Band 12, Nr. 477 (P-800) (3324), 14. Dezember 1988; & JP-A-63194236 (Anritsu Corp.) 11. August 1988 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0935150A1 (fr) * 1998-02-09 1999-08-11 LDT GmbH & Co. Laser-Display-Technologie KG Dispositif de balayage, son utilisation et système vidéo
US6281948B1 (en) 1998-02-09 2001-08-28 Ldt Gmbh & Co. Laser-Display-Technologies Kg Device for deflection, use thereof, and a video system
DE10049296B4 (de) * 2000-08-03 2013-06-20 Leica Microsystems Cms Gmbh Optische Anordnung und Verfahren zur Ablenkung eines Lichtstrahls

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DE3830455C2 (fr) 1992-04-02

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