FR2478353A1 - Laser projecting appts. for long distance projection - uses electronic control of position of laser and vibrating mirrors to project rectangular transparency image - Google Patents

Laser projecting appts. for long distance projection - uses electronic control of position of laser and vibrating mirrors to project rectangular transparency image Download PDF

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Publication number
FR2478353A1
FR2478353A1 FR8005568A FR8005568A FR2478353A1 FR 2478353 A1 FR2478353 A1 FR 2478353A1 FR 8005568 A FR8005568 A FR 8005568A FR 8005568 A FR8005568 A FR 8005568A FR 2478353 A1 FR2478353 A1 FR 2478353A1
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France
Prior art keywords
laser
mirrors
projection
ray
appts
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
FR8005568A
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French (fr)
Inventor
Louis Perrin
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PERRIN SYLVIANE
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PERRIN SYLVIANE
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Filing date
Publication date
Application filed by PERRIN SYLVIANE filed Critical PERRIN SYLVIANE
Priority to FR8005568A priority Critical patent/FR2478353A1/en
Publication of FR2478353A1 publication Critical patent/FR2478353A1/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F19/00—Advertising or display means not otherwise provided for
    • G09F19/12—Advertising or display means not otherwise provided for using special optical effects
    • G09F19/16—Advertising or display means not otherwise provided for using special optical effects involving the use of mirrors

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  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Marketing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)

Abstract

The projector uses a laser as the light source to allow projection over long distances. The light emanating from the laser (1) is reflected firstly from a mirror (2) which has a slight horizontal oscillation, then from a second mirror (4) having a slight vertical oscillation. The combined effect of the oscillations of the two mirrors is to produce a Lissajous figure which to the human eye appears to define a small rectangle. By horizontal and vertical positioning of the oscillating mirrors an image is formed dependent on the amount of light emitted for particular orientations of the mirrors. Electronic circuits may be used to position the laser and the mirrors so that a transparency is scanned and its image projected onto a distant surface.

Description

La présente invention concerne un dispositif projecteur mettant à profit les propriétés particulières du rayon LASER. The present invention relates to a projector device taking advantage of the particular properties of the LASER beam.

Dans les projecteurs classiques, on utilise une source de lumière à émission spontanée, associée à des dispositifs optiques répartissant la lumiére dans un angle solide et sur le trajet de laquelle on interpose des obstacles de densité optique variable afin d'obtenir une image sur un écran. In conventional projectors, a spontaneous emission light source is used, associated with optical devices distributing the light in a solid angle and on the path of which obstacles of variable optical density are interposed in order to obtain an image on a screen. .

De tels dispositifs ne permettent pas d'obtenir des projections à tres grandes distances. Such devices do not make it possible to obtain projections at very great distances.

Le dispositif selon l'invention permet de remedier à cet inconvenient. En effet on utilise un faisceau de lumiére cohérente, tres faiblement divergente et qui se propage à des distances considérables, plusieurs kilometres pour une puissance de 100 milliwatts. Ce faisceau se réfléchis successivement sur deux ou plusieurs miroirs associés à des dispositifs vibrants, lames ou diapasons, de façon à obter nir un balayage de l'espace par le rayon selon un angle solide approprié en forme et en dimensions a l'usage auquel il est destiné. The device according to the invention makes it possible to remedy this drawback. In fact, a coherent light beam is used, very slightly diverging and which propagates at considerable distances, several kilometers for a power of 100 milliwatts. This beam is reflected successively on two or more mirrors associated with vibrating devices, blades or tuning forks, so as to obtain a scanning of the space by the ray at a solid angle suitable in shape and dimensions for the use for which it is destined.

La figure 1 représente schématiquement, la forme la plus simple du dispositif selon l'invention. Un rayon LASER 1 frappe le miroir 2 solidaire d'une lame vibrante 3 dont le plan de vibration est horizontal, apres réflexion, il frappe le miroir 4 d'une lame vibrante 5 aont le plan de vibration est vertical et aboutit a un écran 6. Lorsque la lame 3 est seule en vibration on obtient sur l'ecran une trace horizontale 7. Lorsque la lame 5 est seule en mouvement, on obtient une trace verticale 8. Lorsque les deux lames sont simultanément en vibration, on oo- tient une figure qui depena de leur amplitude et de leur fréquence relatives.En intervenant sur ces paramétres, on peut faire en sorte d'obtenir un Lissajous a trame tres serrée que l'oeil observe comme une tache continue de forme rectangulaire ou carrée selon la valeur des amplitudes. Ce résultat est obtenu ae façon d'autant plus nette que les fréquences sont plus élevées. FIG. 1 schematically represents the simplest form of the device according to the invention. A LASER ray 1 strikes the mirror 2 secured to a vibrating blade 3 whose vibration plane is horizontal, after reflection, it strikes the mirror 4 of a vibrating blade 5 whose vibration plane is vertical and results in a screen 6 When the blade 3 is alone in vibration, a horizontal trace is obtained on the screen 7. When the blade 5 is alone in motion, a vertical trace is obtained 8. When the two blades are simultaneously in vibration, an oo figure which depena of their amplitude and their relative frequency. By intervening on these parameters, one can make so as to obtain a Lissajous with very tight weft that the eye observes like a continuous spot of rectangular or square shape according to the value of amplitudes. This result is obtained all the more sharply as the frequencies are higher.

En interposant sur le trajet du rayon, a quelque distance des miroirs des obstacles de densité optique variable, on obtient la projection d'une image.  By interposing on the ray path, at some distance from the mirrors, obstacles of variable optical density, we obtain the projection of an image.

Le dispositif selon l'invention peut etre utilise dans tous les cas ou l'on veut ootenir une projection à tres grande aistance ou mettre a profit~l'eftet spectaculaire du rayon LASER pour des aistances plus réduites. The device according to the invention can be used in all cases where one wants to ootient a projection at very great aistance or to make use of ~ the spectacular effect of the LASER ray for more reduced aistances.

Avec ce dispositif, on peut projeter des dessins, des textes des diapositives ou des films. Il permet de projeter des messages informatifs ou publicitaires sur des obtacles naturels, route, reliefs, nuages, ou sur des ecrans artificiels å l'extérieur ou dans des lieux publics. With this device, you can project drawings, texts, slides or films. It allows to project informative or advertising messages on natural obstructions, road, reliefs, clouds, or on artificial screens outside or in public places.

D'autres apelications particulièrement intéressantes peuvent etre le remplacement des sources de lumière classiques pour la projection des diapositives ou des films couleur dans les appareils de projection en utiiisant des LASER blancs. On peut également l'utiliser pour repérer des obstacles à partir de véhicules quelconques.  Other particularly interesting names can be the replacement of conventional light sources for the projection of slides or color films in projection devices using white LASER. It can also be used to spot obstacles from any vehicle.

Claims (6)

R E V E N D I C A T I O N S 1- Dispositif permettant de modifier la direction d'un rayon LASER atin d'obtenir des effets de projection, caractérisé en ce que le rayon frappe successivement plusieurs miroirs animés de mouvements vibratoires destinés à obtenir un balayage- de l'espace.R E V E N D I C A T I O N S 1- Device for modifying the direction of a LASER ray in order to obtain projection effects, characterized in that the ray successively strikes several mirrors animated with vibratory movements intended to obtain a scanning of the space. 2- Dispositif selon la revendication 1 caractérisé en ce que les miroirs sont solidaires de branches de diapason excités par des dispositifs électromagnetiques associés a des circuits électriques ou électroniques connus. 2- Device according to claim 1 characterized in that the mirrors are integral with tuning fork branches excited by electromagnetic devices associated with known electrical or electronic circuits. f- Dispositif selon la revendication 1 caractérise en ce que les miroirs sont solidaires de poutres encastrées constituant des lames mises en vibration par des dispositifs electromagnétiques associés à des circuits electriques ou electroniques connus. f- Device according to claim 1 characterized in that the mirrors are integral with embedded beams constituting blades vibrated by electromagnetic devices associated with known electrical or electronic circuits. 4- Application du dispositif selon la revendication 1 caractérisé en ce que l'on imposé à au moins deux des miroirs des frequences telles que l'on obtienne un Lissajous à trame trés serrée que l'oeil distingue comme une tache continue. 4- Application of the device according to claim 1 characterized in that one imposed on at least two of the mirrors frequencies such that one obtains a Lissajous very tight frame that the eye distinguishes as a continuous spot. 5- Auplication du dispositif selon la revendication 1 caractérise en ce quton interpose sur le trajet du rayon des obstacles à densité optique variable tels que clichés afin d'ootenir une image sur un écran naturel ou artificiel. 5- Auplication of the device according to claim 1 characterized in that quton interposes on the path of the ray obstacles with variable optical density such as pictures in order to hold an image on a natural or artificial screen. 6- Application du dispositif selon les revendications 1 et 5 à la projection de textes informatiis sur les autoroutes. 6- Application of the device according to claims 1 and 5 to the projection of information texts on motorways. 7- Appllcation du dispositif selon les revendications 1 et b a la projection de messages publicitaires. 7- Appllcation of the device according to claims 1 and b to the projection of advertising messages. b lication du dispositif selon les revenåications 1 et 5 a la projection de diapositives ou de films en couleurs en utilisant un LASER blanc. b lication of the device according to reenåications 1 and 5 to the projection of slides or films in color using a white LASER. 9- aprlication du disrositif selon la revendication 1 à la détection d'obstacles a partir d'un véhicule quelconque.  9. application of the device according to claim 1 to the detection of obstacles from any vehicle.
FR8005568A 1980-03-12 1980-03-12 Laser projecting appts. for long distance projection - uses electronic control of position of laser and vibrating mirrors to project rectangular transparency image Withdrawn FR2478353A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8005568A FR2478353A1 (en) 1980-03-12 1980-03-12 Laser projecting appts. for long distance projection - uses electronic control of position of laser and vibrating mirrors to project rectangular transparency image

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8005568A FR2478353A1 (en) 1980-03-12 1980-03-12 Laser projecting appts. for long distance projection - uses electronic control of position of laser and vibrating mirrors to project rectangular transparency image

Publications (1)

Publication Number Publication Date
FR2478353A1 true FR2478353A1 (en) 1981-09-18

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FR8005568A Withdrawn FR2478353A1 (en) 1980-03-12 1980-03-12 Laser projecting appts. for long distance projection - uses electronic control of position of laser and vibrating mirrors to project rectangular transparency image

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2883404A1 (en) * 2005-03-17 2006-09-22 Guy Lucien Dumont Vibration and light transmitting device for stimulating sensory organ, has tuning fork prolonged at base by removable leg, and torch fixed on leg using magnets that permit to angle flow of lamp and induce magnetic field at end of fork

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR75232E (en) * 1958-07-24 1961-05-12 Method and devices for obtaining colored light effects
FR2033426A5 (en) * 1969-02-24 1970-12-04 Comp Generale Electricite
US3749197A (en) * 1971-05-12 1973-07-31 B Deutsch Obstacle detection system
FR2211624A1 (en) * 1972-12-27 1974-07-19 Le Guezvouit Joseph
US3892478A (en) * 1973-09-27 1975-07-01 Lissatronic Corp Sound to image translator
FR2315739A1 (en) * 1975-06-26 1977-01-21 Peltier Raymond LUMINOUS DISPLAY DEVICE

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR75232E (en) * 1958-07-24 1961-05-12 Method and devices for obtaining colored light effects
FR2033426A5 (en) * 1969-02-24 1970-12-04 Comp Generale Electricite
US3749197A (en) * 1971-05-12 1973-07-31 B Deutsch Obstacle detection system
FR2211624A1 (en) * 1972-12-27 1974-07-19 Le Guezvouit Joseph
US3892478A (en) * 1973-09-27 1975-07-01 Lissatronic Corp Sound to image translator
FR2315739A1 (en) * 1975-06-26 1977-01-21 Peltier Raymond LUMINOUS DISPLAY DEVICE

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2883404A1 (en) * 2005-03-17 2006-09-22 Guy Lucien Dumont Vibration and light transmitting device for stimulating sensory organ, has tuning fork prolonged at base by removable leg, and torch fixed on leg using magnets that permit to angle flow of lamp and induce magnetic field at end of fork

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