EP0357943A1 - Source lumineuse pour un dispositif affichant une image sur un augle de 360 degrées - Google Patents

Source lumineuse pour un dispositif affichant une image sur un augle de 360 degrées Download PDF

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Publication number
EP0357943A1
EP0357943A1 EP89114008A EP89114008A EP0357943A1 EP 0357943 A1 EP0357943 A1 EP 0357943A1 EP 89114008 A EP89114008 A EP 89114008A EP 89114008 A EP89114008 A EP 89114008A EP 0357943 A1 EP0357943 A1 EP 0357943A1
Authority
EP
European Patent Office
Prior art keywords
drum
light
light source
image
lamp
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Withdrawn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
EP89114008A
Other languages
German (de)
English (en)
Inventor
Kurt F. Dr. Büchel
Paul Rosenich
Jan Secka
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.)
Interlicense Den Haag BV
Original Assignee
Interlicense Den Haag BV
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 Interlicense Den Haag BV filed Critical Interlicense Den Haag BV
Publication of EP0357943A1 publication Critical patent/EP0357943A1/fr
Withdrawn legal-status Critical Current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
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/32—Illuminated signs; Luminous advertising with moving optical part of parts, e.g. mirrors

Definitions

  • the invention relates to a light source according to the preamble of claim 1.
  • a device for all-round pointing has become known from EP-A-208283.
  • This European patent application as well as PCT / CH88 / 00098 and the Swiss patent application "Rotatable device for the visualization of an image through an angle of 360 °" from the same filing date as the present patent application are deemed to be disclosed within the scope of this description.
  • EP-A-208283 describes the principle of the device, while PCT / CH88 / 00098 specifies improvements and specifications of the grid.
  • the CH patent application deals with a special design of the drive system.
  • the object of the invention was therefore to create or find a light source, using which the effects described as disadvantageous do not occur. This problem is solved for the first time by the feature of the characterizing part of claim 1.
  • a light source with at least one of the two features of claim 2 causes an apparently optimal uniformity of the emitted light quantity of the image.
  • This apparent uniformity is based on an optical illusion; because the image is actually passed by the viewer 50x per second (e.g. at 3000 revolutions) and emits a flash of light at this viewer 50x per second; however, since the human visual system is much slower, these flashes of light are perceived as a still image.
  • the simplest form of a corresponding light source is a filament lamp according to claim 4;
  • the effect arises from the fact that the filament has a certain afterglow time - it is made to glow by the current.
  • the filament cools down during the zero crossing of a current or voltage wave, but this process is time-delayed device.
  • the disadvantage here is that the amount of energy required and the amount of heat released unintentionally are relatively large.
  • a simple measure to achieve the inventive effect results from the features of claim 7, the type of lamps being rather insignificant - however, the uniformity of the light is advantageous, for example when using lamps according to claim 5 or 6, for light continuity.
  • the measures of claim 7 increase the total time of all bright phases and, under certain circumstances, extend their duration, provided that an addition of the luminous fluxes of the different lamps results in a luminous flux of more than 90% of the maximum light intensity at a certain point in time.
  • a variant according to claim 9 has more balancing problems and additionally requires slip rings or the like for power transmission, but occurs compared to that variant described here with less energy for the same light output.
  • several lamps could also be mounted in a drum (eg below and above) in order to obtain the desired light intensity. The closer the lamps are assigned to the axis of rotation of the drum, the lower the centrifugal forces acting on them. They can even be mounted directly on the axis of rotation, ie on the back of the image, in which case a reflector with heat dissipation properties between the lamp and the image is advisable.
  • the features of claim 10 describe advantageous cooling variants for solving the temperature problem which is always present in motor drives and electrical lighting.
  • Fig. 8 is a dashed sine curve S - starting at the origin of the horizontal axis U, t - shown that the Cycle of rotation of the image carrier or the image over time in relation to the angular position. At a rotation speed of 50 revolutions per second, the image has covered an angle of 360 ° over a period of 1/50 seconds.
  • a thickly drawn sine wave V is shown over the same horizontal axis U, t at twice the frequency of that of the rotation cycle. It essentially represents a light cycle wave, or the voltage supplied to the light source - an alternating voltage.
  • the light maxima result in each case in the vicinity (due to an internal inertia mostly somewhat later) of the voltage maxima in the positive (upper) or negative (lower) range the horizontal axis. To simplify matters, it is shown as if the voltage curve were identical to the light curve.
  • the area in which the light intensity is at least 50%, preferably at least 75%, in particular at least 90% of the maximum light intensity should be defined as the bright phase.
  • the areas shaded to the right thus show the light phases over time with a light cycle of 200 Hz, which corresponds to a voltage cycle of 100 Hz AC voltage.
  • the bright phases total about 30% of the total duration of one revolution, which means that the effect according to the invention can already be achieved.
  • at least one light phase preferably at least two, but in particular more than two, are allotted to the time the image is visible from a given viewer position (this time corresponds to a half-wave of curve 5).
  • FIGS. 1 and 4 shows a transparent drum 10 which has an upper and lower end plate 19c and b.
  • Two gas discharge lamps / PL lamps 3b are socketed in the lower plate 19b.
  • the PL lamps 3b are fixed in their upper region by a guide 20 on the upper plate 19c. This serves to relieve the lower, not shown, base of the lamps against the centrifugal force in the operating state.
  • power connections can be provided on both plates 19b, 19c.
  • the lower plate 19b is supported on a needle 21 and a tubular gear attachment 23 concentric with the axis of rotation 22 is attached. This carries on its outside slip rings 24, which are acted upon by carbon brushes 25. Only three slip rings 24 or carbon brushes 25 are shown, although different numbers of slip rings are required for different lamp constructions. For example, a slip ring arrangement with six slip rings is required for a circuit with two PL tubes, while four slip rings are sufficient for an arrangement with a single PL lamp and two slip rings are sufficient for one with a filament lamp.
  • Leads 26 lead from the carbon brushes 25 to alternating current voltage sources 5b and c according to FIG. 1 (which may contain frequency multipliers) or to a high-frequency ballast 7 according to FIG.
  • alternating current voltage sources 5b and c which may contain frequency multipliers
  • a high-frequency ballast 7 according to FIG.
  • An asynchronous external rotor motor is used as the motor, for example.
  • the bearing needle 21, the carbon brushes 25, the AC voltage sources 5b and c and the high-frequency ballast 7 are fixed in an outer housing 28 - in a manner not shown in detail.
  • the outer housing 28, like the image carrier drum, is transparent and drum-shaped and also has an upper and lower end plate 29a, b.
  • the end plates 19 and 29 are made, for example, of aluminum or of opaque colored acrylic glass, while the cylindrical walls of the drum 10 or the outer housing 28 are made of plexiglass or glass.
  • the motor 27 drives the gear attachment 23 and thus the drum 10 via a drive wheel 30.
  • the slip rings 24 are connected to the gas discharge lamps 3b via current paths (not shown), so that when the current is switched on these lamps light up and the motor 27 sets the drum 10 in rotation.
  • the image 14 - only shown in FIGS. 2 and 3 - is located in front of the gas discharge lamps 3b and is irradiated by them.
  • the known viewing angle, also not shown, limits the possible viewing angle to the image, which creates the effect of all-round visibility, as explained in the patent applications cited at the beginning.
  • the drum 10 or its upper end plate 19c is connected to the upper end plate 29a via a bearing and a bearing journal 31.
  • the drum 10 is balanced in a manner not shown in a manner known to a person skilled in the art, for example by applying balancing weights.
  • the drum 10 is shown in a position rotated by 90 °, so that an image 14 with a lamella grid 32 attached in front of it is visible.
  • the light source 2b is not located inside the drum 10, but below it. It consists of three filament lamps 1c, d, e, which are held in the outer housing, not shown in FIG.
  • the motor 27a is connected via a bearing shaft 8d directly to the lower end plate 19a, which is darkened or mirrored downwards in the half region in front of the grid 32, however, or is mirrored.
  • the space of the drum 10 facing the image 14 is preferably mirrored.
  • the filament lamps 1c to e are supplied with power by alternating voltage sources 5b to d, the voltages of which are phase-shifted from one another by 120 °. Thereby he is a much more uniform light from the light source 2b as a whole.
  • the three lamps could, for example, also be accommodated within the drum, as a result of which the time sum of the light phases is at least 70% of the rotation time.
  • FIG. 5 A variant similar to that in FIG. 2 - shown with the light source 2b outside the drum 10 - can be seen in FIG. 5.
  • the gas discharge lamp 3a shown there is held in a ring around the axis of rotation 22 in the outer housing 28.
  • the light rays are designated 33.
  • the mirroring of the space behind the picture is indicated by hatching.
  • the mirror layer of the face plate 19a in front of the grid 32 is denoted by 34.
  • the drum 10 is rotatably supported at the bottom on a bearing ball 35 and at the top by means of needle bearings 36. This results in the greatest smoothness and minimal interference of the light source 2b or the light - represented by the rays 33.
  • the motor 27b is transversely supported above the drum 10 on the base plate 29c and drives the drum 10 by means of the drive wheel 30a. Due to the spatially separated housing of the motor 27b and the light source 2b, a mutual disadvantageous heat influence is eliminated.
  • the transverse engine also has a flatter design, so that the variant according to FIG. 5 represents a relatively small device with the same image size.
  • the motor is held pressed by a spring 37 in the direction of the end plate 19d.
  • the spring 37 is supported against a roof 38 of the outer housing 28.
  • the variant according to FIG. 6 shows a drum 10 with internally mounted light sources 2a, which each consist of a filament lamp 1a or 1b.
  • the power supply in this variant does not take place via slip rings, but directly via the bearing shaft 8b, or via the bearing and the bearing journal 31a. Since the upper and lower end plates 19c and b made of conductive aluminum nium, the power supply to the lamps 1a and 1b can be tapped directly from these base plates 19.
  • carbon brushes could also act directly on the end plates 19.
  • the current paths in the interior of the drum 10 are designated by 26a. They are preferably wafer-thin silver webs glued to the wall of the drum 10, which are almost invisible to the naked eye.
  • insulated wires can also be laid in the mirrored part of the drum 10.
  • the power supply from the lower part of the device to the upper also takes place via wafer-thin conductor tracks, not shown, on the outer housing 28, preferably on the inside thereof.
  • a separate fan 39 is provided, which draws in the air at the bottom and conveys it upwards between the drum 10 and the outer housing 28, as a result of which the drum 10 is also cooled. Vent slots 16a allow air to escape, while air supply slots 11 allow access.
  • the power supply lines to the fan 39 and to the motors are known to any person skilled in the art.
  • the variant according to FIG. 7 does not have its own fan, but rather a fan wheel 12 mounted on an upper bearing shaft 8e. This blows the exhaust air outwards through radial ventilation slots 16b. The air is also fed through air supply slots 11 in the lower region.
  • a disc motor 27d is used as the drive. This is particularly flat and is therefore suitable for low devices; it could also be flanged directly to the lower end plate.
  • the rotary drive for the fan wheel 12 takes place via the drum 10.
  • the radial ventilation slots 16b are provided in a tower-shaped attachment 39 which is mounted on the upper end plate 29d.
  • FIG. 3 shows the section through a fluorescent tube 3c with a special fluorescent layer 6, which causes a particularly long afterglow behavior and thus particularly long brightness phases.
  • switched stroboscopic lamps can be used as the light source in the sense explained.
  • the number of flashes of light can be synchronized with the speed via contact disks or the like (cf. cylinder 23) or via electronic synchronization.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Stereoscopic And Panoramic Photography (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
EP89114008A 1988-08-02 1989-07-28 Source lumineuse pour un dispositif affichant une image sur un augle de 360 degrées Withdrawn EP0357943A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2915/88 1988-08-02
CH2915/88A CH679530A5 (fr) 1988-08-02 1988-08-02

Publications (1)

Publication Number Publication Date
EP0357943A1 true EP0357943A1 (fr) 1990-03-14

Family

ID=4244485

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89114008A Withdrawn EP0357943A1 (fr) 1988-08-02 1989-07-28 Source lumineuse pour un dispositif affichant une image sur un augle de 360 degrées

Country Status (4)

Country Link
US (1) US5003444A (fr)
EP (1) EP0357943A1 (fr)
JP (1) JPH02177680A (fr)
CH (1) CH679530A5 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5309338A (en) * 1992-10-29 1994-05-03 Liu Zuo H Rotatable lighting equipment
US5408389A (en) * 1993-09-07 1995-04-18 Burlingame; Glen E. Interrupted light source
US5607217A (en) * 1993-10-26 1997-03-04 Hobbs, Ii; James C. Illumination system
US5517388A (en) * 1995-01-26 1996-05-14 Dominion Automotive Group, Inc. Rotating light beacon including low-profile stepper motor
US5717416A (en) * 1995-04-11 1998-02-10 The University Of Kansas Three-dimensional display apparatus
US6005608A (en) * 1996-05-06 1999-12-21 The University Of Kansas Three-dimensional display apparatus
US6646623B1 (en) 1999-06-01 2003-11-11 The University Of Kansas Three-dimensional display apparatus
FR2857493A1 (fr) * 2003-07-10 2005-01-14 Thomas Charles Arthur Petitet Panneau d'affichage publicitaire circulaire et tournant
GB0419071D0 (en) * 2004-08-26 2004-09-29 Mgx Internat Ltd Display device
CN1971675A (zh) * 2005-11-25 2007-05-30 光远科技股份有限公司 柱状显示屏幕
US20160054900A1 (en) * 2014-08-25 2016-02-25 Chuck Surack Computer Implemented System and Method for Producing 360 Degree Perspective Images
KR102834304B1 (ko) * 2019-09-26 2025-07-15 엘지전자 주식회사 반도체 발광 소자를 이용한 회전형 디스플레이 장치

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2913954A (en) * 1953-07-16 1959-11-24 Morgan Whitney Matarese Corp Combined zoetrope and phonograph
EP0143653A2 (fr) * 1983-11-29 1985-06-05 John Ashley Dane Dispositif d'affichage
EP0208283A1 (fr) * 1985-07-10 1987-01-14 Technolizenz Establishment Dispositif d'affichage destiné à diriger une image selon un axe rotatif

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB143653A (en) * 1919-03-06 1920-06-03 George Hillard Benjamin Improvements in tunnel kilns

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2913954A (en) * 1953-07-16 1959-11-24 Morgan Whitney Matarese Corp Combined zoetrope and phonograph
EP0143653A2 (fr) * 1983-11-29 1985-06-05 John Ashley Dane Dispositif d'affichage
EP0208283A1 (fr) * 1985-07-10 1987-01-14 Technolizenz Establishment Dispositif d'affichage destiné à diriger une image selon un axe rotatif

Also Published As

Publication number Publication date
US5003444A (en) 1991-03-26
CH679530A5 (fr) 1992-02-28
JPH02177680A (ja) 1990-07-10

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