EP0165260B1 - Dispositif d'affichage lumineux - Google Patents

Dispositif d'affichage lumineux Download PDF

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Publication number
EP0165260B1
EP0165260B1 EP84904141A EP84904141A EP0165260B1 EP 0165260 B1 EP0165260 B1 EP 0165260B1 EP 84904141 A EP84904141 A EP 84904141A EP 84904141 A EP84904141 A EP 84904141A EP 0165260 B1 EP0165260 B1 EP 0165260B1
Authority
EP
European Patent Office
Prior art keywords
light
magnet
appliance according
electro
section
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.)
Expired
Application number
EP84904141A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0165260A1 (fr
Inventor
Robert Fournier
Roland Gasmann
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.)
CETEHOR (CENTRE TECHNIQUE DE L'INDUSTRIE HORLOGERE)
Original Assignee
CETEHOR (CENTRE TECHNIQUE DE L'INDUSTRIE HORLOGERE)
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 CETEHOR (CENTRE TECHNIQUE DE L'INDUSTRIE HORLOGERE) filed Critical CETEHOR (CENTRE TECHNIQUE DE L'INDUSTRIE HORLOGERE)
Priority to AT84904141T priority Critical patent/ATE36086T1/de
Publication of EP0165260A1 publication Critical patent/EP0165260A1/fr
Application granted granted Critical
Publication of EP0165260B1 publication Critical patent/EP0165260B1/fr
Expired 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
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/37—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being movable elements
    • G09F9/375—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being movable elements the position of the elements being controlled by the application of a magnetic field
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/305—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being the ends of optical fibres

Definitions

  • the present invention relates to a light display device comprising at least one front panel provided with a regular network of openings, each of which is associated with a downstream end of a light conductor and with a respective shutter member controlled by a electromagnet, the upstream end of the light conductors being associated with a light source, the shutter member being provided with a rigid body which carries said electromagnet and an opaque cap capable of pivoting around a axis substantially perpendicular to said section of light conductor, between a first position called the shutter position and a second position called the lighting position, this opaque cap being linked to a bipolar permanent magnet which is movable relative to the body under the effect of excitations of the electromagnet according to alternating polarities.
  • Patent application FR-A-2,517,545 describes a positive of this kind, in which each shutter cap (or an equivalent member in the form of a pivoting flap) is held stably in one or the other of its two positions thanks to the continuous excitation, with the appropriate polarity, of the electromagnet associated with it. This guarantees the stability of the shutter member in both positions, but this results in a high consumption of electrical energy since all the electromagnets of the device must be supplied continuously.
  • the present invention proposes to overcome this drawback by providing a relatively economical device which allows a light display, in particular of alphanumeric character, fixed, variable or continuously scrolling, and in which the shutter caps are stable in their two positions even when the excitement of their respective electromagnet has ceased.
  • the device according to the invention is characterized in that said rigid body of each obturation member is provided with an axial bore in which is engaged a section adjacent to the downstream end of a light conductor, and in that the electromagnet comprises a stator made of magnetic remanence material, which retains the polarity created by the last excitation of the electromagnet, so that its remanent magnetic field keeps the cap stable in position as well shutter only in the lighting position.
  • the permanent magnet is mounted on the body so as to pivot about the same axis as the cap.
  • the moving element of the shutter member comprising said opaque cap and said permanent magnet preferably has an inertia of less than: 0.1 ⁇ 10 -9 kg.m 2 .
  • the light conductors each advantageously comprise a downstream end section, oriented towards an opening of the front panel and the section of which is smaller than that of the upstream end section, oriented towards the light source.
  • the upstream end sections of these light conductors advantageously have a substantially frustoconical shape, the downstream end sections having a substantially cylindrical shape.
  • these light conductors can have a conical or frustoconical shape over their entire length.
  • the upstream ends of the light conductors are preferably linked to a light conducting base plate, adjacent to the light source.
  • the light conductors are constituted by cylindrical, conical or frustoconical points secured to a base plate and erected substantially perpendicular to a surface of this plate. These points and this plate are preferably made of a molded block of light-conducting synthetic material.
  • the light display device 10 is in the form of a housing provided with a front panel 11 comprising both a regular network of openings 12 which may or may not be individually lit from the rear so as to allow the recording of alphanumeric characters arranged in rows or columns in order to display a fixed message, variable over time or scrolling continuously.
  • This display is made using a control logic (not shown) which can be connected to a console 13 provided with a keyboard 14 allowing the introduction of data relating to the message to be displayed.
  • the housing of the display device 10 is for example constituted by a sheet folded in the shape of a U, the front face of which comprises an opening 15 intended to receive a matrix 16 composed of a set of cells 17 provided for each receiving a shutter member 18.
  • the front face 19 of the matrix 16 is provided with a network of openings 12, each of which is disposed substantially at the center of the surface constituting the bottom of one of the cells 17.
  • the front panel 11 of the device display 10 is preferably constituted by several front faces 19 of several dies 16 juxtaposed. Each of these dies has two fixing flanges 20 intended to bear between the folded edges 21 of the housing of the device 10. Openings 22 are formed through said fixing flanges 20 and the support edges 21 of the housing to allow the assembly of these various components, for example by means of screws 23.
  • the shutter members 18 are mounted on a printed circuit board 24 whose conductive tracks of the printed circuit are individually connected to the connectors (not shown) of a connection strip 25.
  • the light conductors 26 consist of a unitary block preferably produced by molding using a translucent material which diffuses the light.
  • This block advantageously consists of a base plate 27 bristling with a series of points 28 each of which corresponds to a shutter member 18 and to an opening 12 in the front panel.
  • the points 28 each consist of an upstream end section 29 of frustoconical shape and of a downstream end section 30 of cylindrical shape.
  • the light conductors 26 are illuminated from the rear using a lighting module 31 essentially composed of a fluorescent tube 32 and a reflector 33 mounted respectively on two bases 34 and a support 35 secured to a housing 36.
  • the lighting module is preferably housed in a housing comprising lateral flanges 37 which can be coupled to the housing of the device 10 by means of notches 38 in which engage pins 39 shown in broken lines. In this way, the lighting module can be easily separated from the rest of the device, for example to allow the replacement of a defective lighting tube, cleaning of the reflector, etc.
  • each shutter member 18 At the time of assembly, the downstream end sections 30 of the light conductors will be engaged respectively in a central bore of each shutter member 18. These shutter members associated respectively with the light conductors will be introduced into the cells 17 of the dies 16.
  • the light generated by the fluorescent tube 32 is reflected by the reflector 33 and diffused by the base plate 27 and transmitted towards the openings 12 of the front panel by the tips 28.
  • the openings 12 can be obscured individually by means of the shutter members 18 manipulated by a control logic.
  • Fig. 3 illustrates another embodiment of the light conductors.
  • the points 28 ′ secured to the base plate 27 ′ are in the form of trunks of cones whose base which constitutes the upstream end is oriented towards the light source constituted as previously of a fluorescent tube 32 ′ and a 33 'parabolic reflector.
  • Fig. 4 schematically shows another embodiment of the light conductors which are in the form of individual elements 40 each composed of a downstream end section 41 of circular, square or any other cross-section, and of a section upstream end 42 of frustoconical shape.
  • the area of the upstream end section i.e. that which is oriented towards the light source, is preferably larger than the area of the downstream end section, so that said upstream end collects a maximum of light emitted by the light source 43 and reflected by the reflector 44.
  • the shape of the straight sections of the upstream and downstream end sections can be arbitrary.
  • Fig. 5 schematically represents the electromagnet for controlling the shutter member.
  • This shutter member preferably comprises a spherical cap 50 linked by a rigid rod 51 to a bipolar permanent magnet 52 preferably in the form of a magnetic bar.
  • the spherical cap 50, the rod 51 and the bipolar magnet 52 constitute the rotary movable assembly around an axis 53. This axis is substantially perpendicular to the downstream end section 54 of the light conductor.
  • the control electromagnet consists of a U-shaped stator 55 carrying a coil 56 intended to generate an alternating magnetic field which determines the two stable positions of the permanent magnet 52 and therefore of the spherical cap 50 which associated with it.
  • the spherical cap 52 obscures an opening 12 of the front panel 11.
  • the spherical cap In its position 50 'corresponding to the position 52' of the permanent magnet, the spherical cap has tilted so as to release the passage of the light emitted by the downstream end of the section of light conductor 54 so that the corresponding opening 12 appears as a light spot.
  • control of the obturation member can be carried out at relatively high frequency, equal to or greater than 24 cycles per second, which allows, thanks to the retinal persistence, display scrolling messages continuously or intermittently on the front panel.
  • Fig. 6 shows a perspective view of the shutter member associated with each of the light conductors and with each of the openings in the front panel.
  • This shutter member essentially consists of a rigid body 60 serving as a support for the electromagnet provided with a U-shaped stator 61, a coil 62 mounted on one of the branches of the stator and d 'a magnetic bar 63 housed in a plastic sleeve 64 connected by an arm 65 to a spherical cap 66.
  • the body of the shutter member 60 comprises two arms 67 and 68 on which are articulated around a common axis 69 on the one hand the sleeve 64 and on the other hand an arm 70 diametrically opposite the arm 65 and also carrying the spherical cap 66.
  • the axis 69 is substantially perpendicular to the axis of the central bore 71 passing through the body 60 and intended to receive the downstream end section (not shown) of the light conductor.
  • Two pins 72 and 73 held by suitable supports 74 and 75 integral with the body 60 provide the electrical connection of the coil 62 of the electromagnet.
  • the particularly compact construction of the shutter member allows very dense implantation of openings, and consequently of light spots on the front panel of the display device.
  • the movement of the shutter member is caused by the action of a magnetic field with alternating polarity, created in the two branches of the U-shaped stator, and acting on the bipolar magnet secured to the shutter member.
  • the peculiarity resides in the fact that the material of the U-shaped stator is remanent, that is to say that it keeps, for a theoretically infinite time, its magnetization, the polarity of the latter being defined by the direction of the last electrical pulse received by the winding.
  • the screen is bistable and requires no external energy to maintain one of its two states. Among other things, it does not use gravity, which allows it to function in all positions. The only energy he uses is the remanent magnetization existing between the stator and the magnet.
  • the concealer can operate by means of very short pulses, which may be much less than the mechanical response time of the shutter member.
  • the magnetic memory effect of the stator allows the shutter member to take its position well after the end of the control pulse. Thus, even if, by an external action, the shutter member is blocked in its initial position, and it is released long after the impulse, it will recover its final position by itself.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
EP84904141A 1983-11-23 1984-11-21 Dispositif d'affichage lumineux Expired EP0165260B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84904141T ATE36086T1 (de) 1983-11-23 1984-11-21 Leuchtanzeigeanordnung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8318776A FR2555343B1 (fr) 1983-11-23 1983-11-23 Dispositif d'affichage lumineux
FR8318776 1983-11-23

Publications (2)

Publication Number Publication Date
EP0165260A1 EP0165260A1 (fr) 1985-12-27
EP0165260B1 true EP0165260B1 (fr) 1988-07-27

Family

ID=9294493

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84904141A Expired EP0165260B1 (fr) 1983-11-23 1984-11-21 Dispositif d'affichage lumineux

Country Status (6)

Country Link
EP (1) EP0165260B1 (it)
CA (1) CA1266973A (it)
DE (1) DE3473072D1 (it)
FR (1) FR2555343B1 (it)
IT (1) IT1178257B (it)
WO (1) WO1985002478A1 (it)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE107787T1 (de) * 1989-05-19 1994-07-15 Dambach Werke Gmbh Anzeigevorrichtung für alphanumerische anzeigen.
US5055832A (en) * 1989-06-09 1991-10-08 Dayco Products Canada Inc. Display element with notched disk
DE4022649C1 (it) * 1990-07-17 1991-10-24 Dambach-Werke Gmbh, 7560 Gaggenau, De
FR2666159B1 (fr) * 1990-08-22 1992-12-11 Aerospatiale Dispositif bistable sans frottement pour usage spatial, notamment pour l'obturation d'un orifice d'entree d'un instrument optique spatial.
US5793349A (en) * 1992-03-20 1998-08-11 Mark Iv Industries Limited Electromagnetic shutter and cover
US5337077A (en) * 1992-03-20 1994-08-09 Mark Iv Industries Limited Electromagnetic shutter

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0082975A1 (de) * 1981-12-05 1983-07-06 Friedrich Merk-Telefonbau GmbH Anzeigeeinrichtung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1365911A (en) * 1971-04-14 1974-09-04 Universal Telewriters Pty Ltd Information display devices
GB1464001A (en) * 1973-03-07 1977-02-09 Buchert C Data display panels
DE2831174A1 (de) * 1977-07-15 1979-01-18 Kawaguchiko Seimitsu Kk Leuchtanzeige-vorrichtung
FR2517445A1 (fr) * 1981-12-01 1983-06-03 World Acrilux Dispositif d'affichage a fibres optiques
FR2533342B1 (fr) * 1982-09-22 1985-07-26 Fibres Optiques Rech Technolo Nouvel interrupteur magneto-optique, son application aux parties elementaires ou points d'affichage et dispositifs d'affichage comportant de tels points d'affichage optique

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0082975A1 (de) * 1981-12-05 1983-07-06 Friedrich Merk-Telefonbau GmbH Anzeigeeinrichtung

Also Published As

Publication number Publication date
DE3473072D1 (en) 1988-09-01
EP0165260A1 (fr) 1985-12-27
CA1266973A (fr) 1990-03-27
FR2555343A1 (fr) 1985-05-24
WO1985002478A1 (fr) 1985-06-06
IT1178257B (it) 1987-09-09
IT8449194A0 (it) 1984-11-22
IT8449194A1 (it) 1986-05-22
FR2555343B1 (fr) 1987-01-23

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