EP0357942A1 - Drehbare Einrichtung für das Sichtbarmachen eines Bildes über einen Winkel von 360 Grad - Google Patents

Drehbare Einrichtung für das Sichtbarmachen eines Bildes über einen Winkel von 360 Grad Download PDF

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Publication number
EP0357942A1
EP0357942A1 EP89114007A EP89114007A EP0357942A1 EP 0357942 A1 EP0357942 A1 EP 0357942A1 EP 89114007 A EP89114007 A EP 89114007A EP 89114007 A EP89114007 A EP 89114007A EP 0357942 A1 EP0357942 A1 EP 0357942A1
Authority
EP
European Patent Office
Prior art keywords
motor
image
image carrier
plate
carrier drum
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Withdrawn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
EP89114007A
Other languages
German (de)
English (en)
French (fr)
Inventor
Paul Rosenich
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 EP0357942A1 publication Critical patent/EP0357942A1/de
Withdrawn legal-status Critical Current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 rotatable device according to the preamble of claim 1 or 2.
  • a rotatable device is known from EP-A-208283.
  • This European patent application as well as PCT / CH88 / 00098 and the patent application "Light source for a device for all-round display of a flat image over an angle of 360 °" from the same filing date as the present patent application are considered to be disclosed within the scope of this description.
  • EP-A-208283 describes the principle of the device, while PCT / CH88 / 00098 specifies the second-mentioned improvements and specifications of the grid.
  • the patent application on the light source is concerned with improvements in light for such a device.
  • the aim of the invention is to provide a rotatable device with a motor in which the transmission of the vibrations of the image carrier drum to the motor is reduced or switched off and in which the motor can be better designed for continuous operation, so that it is essentially based on the Rated speed is coordinated and does not have to be particularly oversized for startup.
  • the variant according to claim 3 is characterized by a simple design, which to a certain extent has integrated a slip clutch.
  • This slip clutch is created between the friction surface and the drive wheel by allowing a certain amount of slippage there.
  • the variation of the radial width of the shaft extension together with the variation of the drive wheel diameter enables the optimal adaptation to the engine characteristic.
  • the drive wheel as proposed in claim 4, is provided with a friction-increasing coating
  • a separate slip clutch between the motor shaft of the drive motor and the drive wheel is advantageous, the coating being noise-damping and reducing the operating noise.
  • various types of clutch known per se can be considered as a slip clutch, such as e.g. Viscose, magnetic or simple friction lining clutches, possibly also cone clutches or multi-plate clutches.
  • the design according to claim 5 has proven to be advantageous in tests, the actual speed of the motor being irrelevant.
  • DC motors run much faster than asynchronous AC motors in many cases, but their design may be smaller so that they are better used.
  • the dividend rpm specified in the formula of claim 5 can be, for example in the case of a device with a corresponding number of revolutions of the image carrier drum, about 2000 to 3000 revolutions per minute, which is the optimal number of revolutions for an apparently stationary image reproduction.
  • lower values - correspondingly lower revolutions of the image carrier drum - can also be used, which, however, can lead to a flashing effect for a single image.
  • the dividend can be halved despite the static image.
  • a bearing according to the features of claim 8 is particularly friction-free according to the invention, an embodiment according to claim 9 additionally giving the advantage of thermal separation between the rotary drive and the light source. The mutual heating of these two important elements of the device is thereby prevented.
  • the area of light access to the image carrier drum is also large enough. It can be further increased by the following measures:
  • the variant according to claim 10 enables the individual setting of an image flashing frequency, which can be further amplified by the additional effect of an interference beat by a light intensity fluctuation of the light source lying at a frequency in the region of the rotational frequency of the image carrier drum. If the position in which the light from the light source is weakened or darkened (dark phase) appears to move around the axis of rotation of the image carrier drum, this leads to an additional light threshold effect, which is particularly suggestive and long-term when a picture is viewed for a long time and the intensity of the light fluctuation is low can be haunting, which is often welcomed by advertisers.
  • Training with a braking device is particularly advantageous for those devices in which the picture is to be changed frequently. Because of the rotating masses of the drum, it may take up to a minute or two for the image carrier drum to come to a standstill without a braking device. Here one can fall back on constructions as they are known for the single image switching of heavier cameras (eg 16mm).
  • the essence of the invention is the load-related separation between an image carrier drum 10 and a motor 3.
  • the motor 3 is only intended to produce the rotary movement of the image carrier drum 10; however, it should be separated from the weight and from any vibrations of the image carrier drum 10.
  • this is done by mounting the image carrier drum 10 on a needle 12a which engages in a bearing pit 21 of a plate 1a of the image carrier drum 10.
  • the bearing pit 21 is tapered - with its center in the axis of rotation 22 of the image carrier drum 10.
  • the needle 12a is shown cranked to the axis of rotation 22, but can also lie entirely in the axis of rotation 22.
  • the area of the needle 12a facing away from the plate 1a is fixed to the housing.
  • the outer housing 28, like the image carrier drum 10, is transparent and is provided with a lower and an upper end plate 29a and b, respectively.
  • the counter bearing to the needle 12a is provided by a journal arrangement 31 between the two upper plates 1b and 21b.
  • a further needle 12b could also function as a counter bearing.
  • the drum 10 instead of running on a ball, runs on the plurality of balls, which can be rolled in a circumferential groove on the underside of the plate 1d and roll in an opposite stationary groove.
  • Such constructions are known from the rotary mounting of slewing cranes, ship unloading systems or the like.
  • the variant according to FIG. 4 is mounted on a magnetic levitation bearing 27 which is fastened on the one hand to the periphery of the lower plate 1e and on the other hand to a bearing ring 26 which is fixed opposite the outer housing 28.
  • the bearing forces in the vertical and radial directions are absorbed by the magnetic forces that are generated by magnets of the magnetic levitation bearing 27.
  • the opposing surfaces 25a, b are magnetically polarized equally, so that they repel each other.
  • FIG. 1 The variant of FIG. 1 is driven by the motor 3a via its motor shaft onto a drive wheel 4a which is in frictional connection with the friction surface 17 of a tubular shaft extension 18 via a friction-increasing lining 5a.
  • the shaft extension 18 is rigidly connected to the lower plate 1a or is formed in one piece with it.
  • Slip rings 24 electrically insulated from one another are mounted on its outer circumference, with carbon brushes 23 being juxtaposed.
  • the carbon brushes 23 are spring-loaded and electrically insulated from one another in a known manner (not shown) and are held firmly with respect to the outer housing 28. They are connected to power sources (not shown) for the light source 2a via supply lines (not shown). The light source 2a is socketed in the plate 1a and connected to the slip rings 24 via current paths (not shown).
  • the motor 3a is connected via electric lines 32 to a torque control 11, to which a braking device 15 is assigned.
  • the torque control can be regulated automatically or via a handwheel 33. It causes an increase in the power of the motor 3a when starting off or a power reduction or variation in the nominal operation, in which, as already mentioned, only bearing forces on the needle 12a or on the bearing journal arrangement 31 have to be overcome. Friction losses on the slip rings 24 are negligible and can be selected by the choice of material, e.g. by increasing the amount of silver added.
  • the variant according to FIG. 2 is driven by a transverse motor 3b which is fastened in the upper end plate 29c.
  • the end plate 29c is accordingly recessed and also has a slot 34 through which a drive wheel, which is rigidly connected to the motor 3b, accesses the top of the plate 1c. Frictional slip can occur between the drive wheel 4b and the plate 1c, as a result of which the motor can reach its rotational speed much faster when starting and the starting torque of the image carrier drum 10 does not lead to a thermal overload of the motor.
  • Frictional slip can occur between the drive wheel 4b and the plate 1c, as a result of which the motor can reach its rotational speed much faster when starting and the starting torque of the image carrier drum 10 does not lead to a thermal overload of the motor.
  • the motor 3b is against the plate by a spring 35 1c held down.
  • the slip behavior can be varied by means of this spring 35 or its spring force, which is preferably adjustable.
  • the spring 35 is supported on the inside of a sheet metal
  • the distance a of the drive wheel 4b from the axis 22 of the image carrier drum 10 is determined by the product of the nominal speed of the motor n m times the radius r of the drive wheel 4b divided by the desired number of revolutions rpm of the image carrier drum 10 - in the most common case 2000 to 3000 revolutions per minute .
  • the power supply to the motor 3b and to the light source 2b is not specified and is known to a person skilled in the art depending on the particular design.
  • a DC motor is particularly suitable as a motor 3b with a transverse position.
  • the light source 2b is located outside the image carrier drum 10 and is mounted as a circular lamp concentrically around the bearing pan 30 in a manner fixed to the outer housing. Their light rays 13 penetrate through the at least half-sided transparent plate 1d into the space behind the image 14. This space is mirrored on the side walls 37. If the plate 1d is completely transparent, it is mirrored on its upper side 39 facing a grid 38 and on its peripheral peripheral edges 40. This results in total reflection and optimal use of light by the light source 2b.
  • the frontally visible space behind the light source 2a in FIG. 1 is also mirrored on its side walls 37 in order to increase the light output and to prevent the light from penetrating outward in the direction facing away from the image.
  • the drive according to Figure 3 corresponds to that of Figure 2.
  • a slip clutch 8 is also provided between the motor shaft 7 and the drive wheel 4b, which allows slippage in the starting operation, as a result of which the lining 5b wears less on the drive wheel 4b.
  • the motor 3c is fed via a speed control element 41 and is connected to a braking device 15, which has a load resistor 16 connected externally.
  • the braking device 15 automatically switches the motor to the braking resistor 16 in generator mode, so that it is braked electrically.
  • the electrical structure of the speed control element 41 and the braking device 15 is known to a person skilled in the art and is therefore not described in detail, but it can be designed as a countercurrent brake known per se, in which the motor is operated until a minimum speed, e.g. until standstill, a counter torque is given.
  • Such circuits have been proposed variously in cinema technology, for example for stopping a shutter in a precise position.
  • a siren plate 19 with openings 20 is indicated in FIG. 3, which is capable of causing air to vibrate at higher speeds and thereby generating tones.
  • the openings 20 are provided with tongues 9 which generate suitable air vortices.
  • the speed control element 41 can be equipped in such a way that it automatically varies the speed so that the sounds produced by the plate 19 result in a melody.
  • the plate 19 is preferably rotatably connected directly below the plate 1, not shown, with the image carrier drum. Your shaft 42 is used as storage for the image carrier drum.
  • the rotation of such a plate can also be used to generate cooling air for dissipating the heat emitted by the light source or motor by providing 9 ventilation blades instead of the tongues.
  • the variant according to FIG. 4 is driven by a motor 3d arranged below the image carrier drum 10 with the axis of rotation 22 centrally, the motor shaft 7a of which is connected to the plate 1e of the image carrier drum 10 via an elastic coupling 4c.
  • the elastic coupling 4c is, for example, a rubber-metal coupling.
  • the side of the coupling 4c facing the plate is either attached directly to the plate 1e or connected to the latter via an intermediate piece (not shown).
  • Vibrations of the image carrier drum 10 are swallowed or damped by the clutch 4c.
  • the weight of the drum 10 is carried by the magnetic levitation bearing 27.
  • a ball or slide bearing could also be provided.
  • a mechanical filter in the form of a flywheel could be provided on the drive side, in front of the clutch, to filter out vibrations, which is uncoupled accordingly for stopping.
  • Another possibility is electronic filtering with the aid of a speed control circuit, which has a tachometer generator connected to the image carrier drum.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Discharging, Photosensitive Material Shape In Electrophotography (AREA)
  • Electrophotography Configuration And Component (AREA)
  • Stereoscopic And Panoramic Photography (AREA)
  • Projection Apparatus (AREA)
  • Casings For Electric Apparatus (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
EP89114007A 1988-08-02 1989-07-28 Drehbare Einrichtung für das Sichtbarmachen eines Bildes über einen Winkel von 360 Grad Withdrawn EP0357942A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH291688A CH677156A5 (enrdf_load_stackoverflow) 1988-08-02 1988-08-02
CH2916/88 1988-08-02

Publications (1)

Publication Number Publication Date
EP0357942A1 true EP0357942A1 (de) 1990-03-14

Family

ID=4244505

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89114007A Withdrawn EP0357942A1 (de) 1988-08-02 1989-07-28 Drehbare Einrichtung für das Sichtbarmachen eines Bildes über einen Winkel von 360 Grad

Country Status (3)

Country Link
EP (1) EP0357942A1 (enrdf_load_stackoverflow)
JP (1) JPH02186695A (enrdf_load_stackoverflow)
CH (1) CH677156A5 (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2679362A1 (fr) * 1991-07-19 1993-01-22 Progyr Dispositif d'affichage d'images.
WO1999041729A1 (en) * 1998-02-17 1999-08-19 Jurjavcic, Marijan Device providing picture visibility from all sides

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5427048B2 (ja) * 2010-01-20 2014-02-26 日立コンシューマエレクトロニクス株式会社 プロジェクタ装置及びプロジェクタ装置の投射ミラー開閉制御方法

Citations (5)

* 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
DE2949419A1 (de) * 1979-12-08 1981-06-11 Gernot 6000 Frankfurt Templin Drehantrieb fuer reklamedarbietungs- und leuchtgeraete
GB2093617A (en) * 1981-02-24 1982-09-02 Lock Trevor John Visual display device
EP0143653A2 (en) * 1983-11-29 1985-06-05 John Ashley Dane Display device
EP0208283A1 (en) * 1985-07-10 1987-01-14 Technolizenz Establishment Display means for directing an image along an angularly movable axis

Patent Citations (5)

* 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
DE2949419A1 (de) * 1979-12-08 1981-06-11 Gernot 6000 Frankfurt Templin Drehantrieb fuer reklamedarbietungs- und leuchtgeraete
GB2093617A (en) * 1981-02-24 1982-09-02 Lock Trevor John Visual display device
EP0143653A2 (en) * 1983-11-29 1985-06-05 John Ashley Dane Display device
EP0208283A1 (en) * 1985-07-10 1987-01-14 Technolizenz Establishment Display means for directing an image along an angularly movable axis

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2679362A1 (fr) * 1991-07-19 1993-01-22 Progyr Dispositif d'affichage d'images.
WO1999041729A1 (en) * 1998-02-17 1999-08-19 Jurjavcic, Marijan Device providing picture visibility from all sides
US6460278B1 (en) 1998-02-17 2002-10-08 Marijan Juravcic Device providing picture visibility from all sides
USRE40536E1 (en) * 1998-02-17 2008-10-14 Damjan Jurjavcic Device providing picture visibility from all sides

Also Published As

Publication number Publication date
JPH02186695A (ja) 1990-07-20
CH677156A5 (enrdf_load_stackoverflow) 1991-04-15

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