EP1835223A1 - Projecteur de lumière permettant de modifier dynamiquement la forme apparente de sujets en déplacement - Google Patents

Projecteur de lumière permettant de modifier dynamiquement la forme apparente de sujets en déplacement Download PDF

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Publication number
EP1835223A1
EP1835223A1 EP07005149A EP07005149A EP1835223A1 EP 1835223 A1 EP1835223 A1 EP 1835223A1 EP 07005149 A EP07005149 A EP 07005149A EP 07005149 A EP07005149 A EP 07005149A EP 1835223 A1 EP1835223 A1 EP 1835223A1
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EP
European Patent Office
Prior art keywords
light
light source
flash
disk
projector according
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Withdrawn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
EP07005149A
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German (de)
English (en)
Inventor
Carlo Alberto Paterlini
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP1835223A1 publication Critical patent/EP1835223A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S10/00—Lighting devices or systems producing a varying lighting effect
    • F21S10/007—Lighting devices or systems producing a varying lighting effect using rotating transparent or colored disks, e.g. gobo wheels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/40—Lighting for industrial, commercial, recreational or military use
    • F21W2131/406—Lighting for industrial, commercial, recreational or military use for theatres, stages or film studios

Definitions

  • the present invention relates to a light projector for dynamically changing the apparent shape of moving subjects.
  • lamps generally of the xenon type, are already commercially available which, when triggered repetitively with a frequency which can vary from approximately 1 Hz to 15 Hz, allow to freeze the movements of moving subjects, so as to create particular effects.
  • an object of the invention is to be able to vary within broad margins the type of effects that can be obtained.
  • Another object of the present invention is to provide a light projector for dynamically changing the apparent shape of moving subjects which, thanks to its particular constructive characteristics, is capable of giving the greatest assurances of reliability and safety in use.
  • Still another object of the present invention is to provide a light projector which can be obtained easily starting from commonly commercially available elements and materials and is also competitive from a merely economical standpoint.
  • a light projector for dynamically changing the apparent shape of moving subjects which comprises a light source for lighting moving subjects, characterized in that it comprises, between said light source and said subjects, variation means for varying the space lit by each flash of light emitted toward said subjects with respect to the preceding flash of emitted light.
  • the light projector for dynamically changing the apparent shape of moving subjects is based on the criterion of emitting flashes, i.e., in practice, a luminous effect of extremely short duration, on the order of microseconds, so that the space is changed at each flash of emitted light, so that each successive flash does not light the space already lit by the preceding flash.
  • the light source which can be of any kind, emits vertical strips of light F1, F2, F3,... F7 and F8, which for example have identical dimensions.
  • the repetition time between the various flashes is set to approximately 30 milliseconds.
  • the region a) of Figure 1 illustrates a rod T which is made to oscillate rapidly so as to assume the position shown in the region b) of Figure 1.
  • the rod T is lit by the flash in the regions F1, F3, F5, F7; after 30 milliseconds, the moving rod T is in the position of the region b) and is made visible by the subsequent flash, but this time the lit regions of the rod T are F2, F4, F6, F8.
  • the human eye has, in the central region of the retina, an image persistence of approximately 30-40 milliseconds, so that if the two images are viewed alternately at a frequency of 25 frames per second or more, the human eye perceives them as "continuous", i.e., seamless.
  • the image is perceived in a "natural" manner, i.e., rather continuously, making the effect even more effective, differently from the traditional stroboscopic effect, which is typically jerky or stepwise.
  • Another variation is determined by the intrinsic duration of each flash.
  • the projector according to the invention differently from any light effect created up to now, dynamically changes the apparent shape of the lit moving subjects, seen by a viewer and in real time.
  • the light projector according to the invention is therefore based on the use of flashes of light which can be obtained both by means of a mechanical action and by means of an electrical action.
  • a light source LA1 is provided which can be constituted for example by a discharge lamp which is capable of emitting continuous light.
  • a first disk R1 which is provided with two mutually opposite openings AS 1 and AS2, which can have variable dimensions in order to vary the duration of the flashes.
  • the disk R1 is connected to a motor MR1, which turns the first disk R1 at a rate of for example 1000 rpm.
  • the motor MR1 that drives the first disk R1 can be connected directly to a second disk R2 which has, for example, 300 slits FT arranged radially, so that by producing a rotation which is 300 times slower than the rotation of the disk R1, at each half-tum of R1 the position of the slits of R2 is swapped with the position of the opaque regions, producing an alternation of light and shadow which is synchronized with the passage of the openings AS 1-AS2 in front of the beam of light.
  • the adjustable openings AS1, AS2 provided on the first disk R1 produce the sequence of flashes having a period of approximately 30 milliseconds.
  • a lens L1 with a suitable focal length, which transfers the image of R2 toward the moving subjects to be lit.
  • the final effect can produce just flashes with a minimum duration of a few milliseconds, and therefore the "deformation" of the moving subjects is softer than obtainable with flash effects having a shorter duration.
  • a light source LF1 is provided which is constituted for example by a xenon lamp which is triggered with very high voltage pulses to emit a flash which lasts 10-20 microseconds.
  • the sequential flashes must be synchronized with the movement of the slitted contour provided by the disk, which is again designated by R2.
  • an optical sensor SO1 which is sensitive to the passage of opaque subjects which are interposed between it.
  • Such sensor is provided with an emitter LED and with a receiving photodiode, which face each other.
  • the disk R2 during its rotation, through its slits, which are for example 300 in number, interrupts or allows the passage only of the beam of light generated by the LED of SO1.
  • the receiving photodiode of SO1 thus generates a square waveform, as shown in box DF1, and in particular it reflects the behavior of the passage of the slits during a rotation of R2.
  • the lamp LF 1 emits a flash, which is indicated in the lower part of box DF 1.
  • a rotation of approximately 3 rpm generates 30 flashes per second, thus achieving the aim of the invention.
  • the lamps provide two separate light sources which are advantageously both constituted by xenon lamps triggered by high-voltage pulses.
  • the beam of such lamps is conveyed in the correct and same direction through an optical prism PR1.
  • the signal generated by the optical sensor again designated by SO1 is divided into two separate signals, as shown in box SP 1.
  • the second signal is simply formed by inverting the original signal.
  • the 30 pulses per second required for correct operation of the invention are sent alternately to the two light sources LF1 and LF2, which thus receive only 15 pulses per second.
  • any xenon lamp is able to work correctly without any problem.
  • LF1 and LF2 which advantageously are xenon lamps triggered by very high voltage pulses (2-3 kV) and emit an intense but extremely short flash lasting 10-20 microseconds.
  • a simple astable multivibrator generates a pulse every 30 milliseconds.
  • the lamps LF1 and LF2 are aligned and mutually opposite, and the light beams are sent to mirrors, designated by SP1 and SP2, which have mutually different inclinations, so as to divert the respective light beam upwardly, as shown in Figures 8 and 9.
  • Figure 8 illustrates the step in which the lamp LF 1 emits its flash.
  • the beam of light passes through the grating G1, splitting into many narrow beams, so that the regions designated by A1, A3, A5, A7, A9, A11 and A13 of the drawing are lit.
  • Figure 9 illustrates the next instant, in which the light source LF2 is activated and the mirror SP2 sends its flash, which through the grating G1 is split into many narrow beams constituted by the regions A2, A4, A6, A8, A10, A12 and A14, which in practice are alternated and complementary with respect to the preceding ones.
  • the alternation of lighting of spaces can be obtainable by using different colors, for example mutually complementary colors.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Stroboscope Apparatuses (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
EP07005149A 2006-03-16 2007-03-13 Projecteur de lumière permettant de modifier dynamiquement la forme apparente de sujets en déplacement Withdrawn EP1835223A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMN20060018 ITMN20060018A1 (it) 2006-03-16 2006-03-16 Proiettore di luce in grado di modificare dinamicamente la forma apparente di soggetti/oggetti in movimento posti davanti ad esso

Publications (1)

Publication Number Publication Date
EP1835223A1 true EP1835223A1 (fr) 2007-09-19

Family

ID=38024225

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07005149A Withdrawn EP1835223A1 (fr) 2006-03-16 2007-03-13 Projecteur de lumière permettant de modifier dynamiquement la forme apparente de sujets en déplacement

Country Status (2)

Country Link
EP (1) EP1835223A1 (fr)
IT (1) ITMN20060018A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2098776A1 (fr) * 2008-03-07 2009-09-09 Everbright Optech Inc. Procédé et dispositif de présentation de figures
EP3356729A4 (fr) * 2015-09-28 2019-05-01 Harman Professional Denmark ApS Appareil d'éclairage projecteur à led présentant des effets de lumière supplémentaires

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020070680A1 (en) * 2000-05-15 2002-06-13 Belliveau Richard S. Method and apparatus for generating a flash or series of flashes from a multiparameter light
EP1443355A2 (fr) * 1996-02-07 2004-08-04 Light & Sound Design, Ltd. Dispositif programmable modifiant la forme d'un faisceau lumineux à l' aide de micromiroirs programmables

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1443355A2 (fr) * 1996-02-07 2004-08-04 Light & Sound Design, Ltd. Dispositif programmable modifiant la forme d'un faisceau lumineux à l' aide de micromiroirs programmables
US20020070680A1 (en) * 2000-05-15 2002-06-13 Belliveau Richard S. Method and apparatus for generating a flash or series of flashes from a multiparameter light

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2098776A1 (fr) * 2008-03-07 2009-09-09 Everbright Optech Inc. Procédé et dispositif de présentation de figures
EP3356729A4 (fr) * 2015-09-28 2019-05-01 Harman Professional Denmark ApS Appareil d'éclairage projecteur à led présentant des effets de lumière supplémentaires
US10724696B2 (en) 2015-09-28 2020-07-28 Harman Professional Denmark Aps LED projecting light fixture with additional light effects

Also Published As

Publication number Publication date
ITMN20060018A1 (it) 2007-09-17

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