WO2002073575A1 - Dispositif pour signaler un document affiche - Google Patents
Dispositif pour signaler un document affiche Download PDFInfo
- Publication number
- WO2002073575A1 WO2002073575A1 PCT/FR2002/000898 FR0200898W WO02073575A1 WO 2002073575 A1 WO2002073575 A1 WO 2002073575A1 FR 0200898 W FR0200898 W FR 0200898W WO 02073575 A1 WO02073575 A1 WO 02073575A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- light
- sensor
- electronic circuit
- document
- Prior art date
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Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F27/00—Combined visual and audible advertising or displaying, e.g. for public address
Definitions
- the present invention relates to a device for signaling the presence of a particular document, for example placed on a bulletin board.
- the invention therefore aims to provide such a device.
- the invention relates to a device for signaling a particular document, in particular displayed, characterized in that it comprises a device for transmitting a signal intended to attract attention and a body which are united, the body being provided with means for removably fixing the document.
- FIG. 1 is a plan view of a device, in accordance to the invention, for signaling a displayed document, this device comprising a device for emitting a light signal according to a first embodiment
- FIG. 2 is a plan view which illustrates the device of Figure 1 in place on the document to be reported, only part of which is shown, -
- FIG. 3 is a block diagram illustrating the functions of an electronic circuit forming part of the device for transmitting a light signal shown in Figures 1 and 2;
- FIG. 4 is a block diagram illustrating the functions of an electronic circuit forming part of a second embodiment of the transmission device of a light signal ;
- FIG. 5 is a block diagram illustrating the functions of an electronic circuit forming part of a third embodiment of the device for transmitting a light signal.
- FIG. 1 represents a device 1, in accordance with the invention, which is intended to be removably placed on a document 2, according to the arrangement represented in FIG. 2, for signaling this document 2. It comprises a body 3 d 'in one piece, and, integrated in this body 3, a device 4 for emitting a light signal, according to a first embodiment.
- the body 3 made of a synthetic material, is in the form of an elongated plate, ending, at one of its two ends, by a transverse edge 5, its other end generally having the shape of a point. triangular 6, rounded at the end. It is pierced with a slot 7 which runs along its outer edge 8 and separates a central tab 9 from a peripheral strip 10. Along the central portion of the transverse edge 5, this slot 7 is interrupted by an elastic bridge 11 connecting the central tab 9 to the peripheral band 10.
- front and rear used below refer to the orientation of the device 1 in place on the document 2 which, being intended to be displayed, comprises a front face intended to be consulted and a rear face.
- the device 1 is seen from its front face, in which is implanted, to be visible, the device 4 for emitting a light signal. More specifically, this device 4 is located on the tongue 9, which its surface and its central position make it particularly suitable for this use.
- this device 4 For its electrical supply, it comprises a photovoltaic cell 13 associated with a capacitor 14 provided for storing the electrical energy produced by it. It also includes an electronic circuit 15 intended to process information received from a photosensitive sensor 16, in order to control the operation of a source. luminous, formed by a light-emitting diode 17.
- the body 3 is shown as being of a transparent material, for the sake of clarity only, so that the capacitor 14 and the electronic circuit 15 which are embedded therein are visible.
- the central tongue 9 of the peripheral strip 10 is moved slightly towards the front, and said document 2 is inserted between them.
- the body 3 is then left to return to its initial shape under the elastic restraint stress action.
- the device 4 for transmitting 'A light signal is therefore arranged in front of this document 2 and turned towards the front so as to be exposed to the same lighting and the same looks as it.
- the use of photovoltaic means to power the device 4 for emitting a light signal is particularly suitable, since the document 2 is intended to be displayed in a lighted place, otherwise it does not could be read.
- the electronic circuit 15 which the device 4 for emitting a light signal incorporates is detailed in FIG. 3.
- This electronic circuit 15 is a signal processing chain which is delivered by the photosensitive sensor 16 in order to control the light-emitting diode 17.
- this chain there is a differentiator 19 connected to the photosensitive sensor 16, a comparator 20 connected to this differentiator 19, an integrator 21 connected to this comparator 20 and a timer 22 connected to this integrator 21 and controlling the operation of the light-emitting diode 17.
- the photosensitive sensor 16 provides a signal S lf, for example a voltage, substantially proportional to its illumination.
- a signal S lf for example a voltage
- the illumination of the photosensitive sensor 16 decreases, which results in a drop in the signal which it delivers. It is therefore the variations of this signal S which constitute the useful information thereof.
- the differentiator 19 extracts therefrom the instantaneous rate of change S 2 , that is to say the derivative of this signal S ⁇ as a function of time.
- This instantaneous rate of change S 2 is compared to a predetermined threshold of negative value by the comparator 20, which outputs an all-or-nothing signal S 3 according to the result of this comparison. More precisely, this all or nothing signal S 3 is equal to 0 if the instantaneous rate of change S 2 is greater than the predetermined threshold, and it is equal to 1 otherwise.
- the integrator 21 outputs a signal S 4 in which the parasitic signals S 3 have been suppressed which, because of their too short duration, cannot be caused by the approach of a person.
- the timer 22 controls the operation of the light-emitting diode 17. It is triggered by an input signal S 4 equal to 1.
- the device 1 In use, the device 1 is placed on a document 2, which is itself displayed, for example among other documents present on a display board.
- the photosensitive sensor 16 does not detect any variation in illumination, it produces a substantially constant signal S- ⁇ at the output.
- the instantaneous rate of change S 2 extracted from this signal Si by the differentiator 19, is then close to zero and therefore greater than the predetermined threshold of the comparator 20, which outputs an all or nothing signal S 3 equal to 0.
- the latter is transmitted by the integrator 21 to the timer 22 which remains in the standby state.
- the light-emitting diode 17 remains off.
- the illumination of the photosensitive sensor 16 decreases, as does the signal Si delivered by the latter.
- the latter is triggered, which is translated by the ignition and the light-emitting diode 17, which remains on for the entire duration counted down by this timer 22.
- the attention of the person who triggered the switching on of the light means 4 is immediately attracted by the ignition of the light-emitting diode 17, and this person immediately locates the document 2 provided with the device 1.
- a second embodiment of the device 4 for emitting a light signal differs from the first embodiment in that it further comprises a photosensitive sensor 12, visible in FIG. 4, and in that the electronic circuit 15 is modified to offer a new function which will be described later.
- the photosensitive sensor 12 is installed in the front face of the peripheral strip 10, at a distance from the transverse edge 5, and it is oriented substantially like the photosensitive sensor 16. Thus, it receives substantially the same illumination as this photosensitive sensor 16 if the device 1 is dissociated from document 2, while in the opposite case shown in FIG. 2, it is hidden by this document 2.
- the electronic circuit 15 of the second embodiment of the device 4 for emitting a light signal is shown in FIG. 4.
- the addition of a subtractor 23 between the photosensitive sensors 12 and 16, on the one hand, and the differentiator 19 on the other hand distinguishes it from the electronic circuit shown in FIG. 3.
- This subtractor 23 delivers a signal S 101 which results from the subtraction of the signals S x and S respectively emitted by the photosensitive sensor 16 and the photosensitive sensor 12, which are therefore advantageously identical.
- the photosensitive sensor 12 When the device 1 is mounted on the document 2 as illustrated in FIG. 2, the photosensitive sensor 12 is substantially protected from light. The value of the signal which it delivers is substantially zero, and the electronic circuit 15 has the operation, previously described, of the electronic circuit 15 shown in FIG. 3.
- the photosensitive sensors 12 and 16 receive the same illumination, even if it varies, since they are arranged on the same face of the body 3 and have substantially the same orientation. Also the subtractor 23 produces a signal S 101 of zero or at least constant value. This makes it possible to prevent inadvertent ignition of the light means 4, which are somehow automatically switched off simply by removing the device 1 from the document 2.
- a third embodiment of the device 4 for emitting a light signal differs from the second embodiment in that it further comprises an audible alarm 18, visible in FIG. 5, as well as the electronic circuit 15 shown in FIG. 5, which takes the place of the electronic circuit 15 shown in FIG. 4.
- This electronic circuit 15 of FIG. 4 forms the base of the electronic circuit of FIG. 5 which also comprises means for triggering the audible alarm 18 in the event of an attempted theft of device 1, and means for stopping this audible alarm 18.
- the means for triggering the audible alarm 18 include a comparator 24, the input of which is connected to the output of the photosensitive sensor 12, and which is provided for comparing the signal S'i emitted by the latter with a predetermined threshold. If the value of this signal S is less than said threshold, the comparator 24 emits an all or nothing signal S 6 of value 1. Otherwise, it delivers an all or nothing signal S 6 of value 0.
- the means for stopping the alarm 18 include a monostable 25 and a logic operator 26.
- the monostable 25 is connected to the output of comparator 20 to deliver an all-or-nothing signal S 7 at level 1 when the signal S 3 which it receives from comparator 20 is also at value 1 or when this signal S 3 has the form a high frequency periodic signal.
- NOR type logic operator 26 is connected to comparator 24 and monostable 25, to deliver an all-or-nothing output signal S 8 resulting from the logical combination of signals S 6 and S 7 emitted respectively by this comparator 24 and this monostable 25. More precisely, the logical operator 26 delivers a signal S 8 of value equal to 0 if any of the input signals S 6 and S 7 has the value 1. If these two input signals S 6 and S 7 are both at 0, it then provides an output signal of value 0.
- the audible alarm 18 is connected to the output of the logic operator 26 which controls its operation. Indeed, it is stopped for a signal S 8 of value 0 and is triggered when this signal S 8 is equal to 1.
- the photosensitive sensor 12 When the device 1 is in place on the document 2, the photosensitive sensor 12 produces a signal S ⁇ whose value is less than the threshold of the comparator 24. The latter consequently delivers an all or nothing signal S ⁇ of value 1. Also, the logic operator emits an all or nothing signal S 8 equal to 0, which results in the blocking of the sound alarm 18.
- the electronic circuit 15 also has the previously described operation of the electronic circuit 15 shown in the figure 4.
- the photosensitive sensor 12 When the device 1 is dissociated from the document 2, the photosensitive sensor 12 emits a signal S 'having a value greater than the threshold of the comparator 24, which, therefore, outputs a signal S 6 of value 0.
- the photosensitive sensor 16 receives the same illumination as the photosensitive sensor 12.
- the subtractor delivers a signal S 101 of value substantially zero or at least constant. Consequently, the signal S 7 delivered by the monostable has the value 0.
- the logic operator 26 supplies a signal S 8 of value 1 which triggers the operation of the audible alarm 18.
- the device 1 In the second case, where the device 1 is removed by an authorized agent, the latter has a device capable of drawing a light signal of high frequency.
- the agent places this device opposite the photosensitive sensor 16 to inhibit the sound alarm 18.
- Each period of this periodic signal S 101 includes a decay phase such that the instantaneous rate of change S 2 of this signal S 10 ⁇ is less than the threshold of the comparator 20, which then provides an all or nothing signal S 3 of value 1. In apart from this decrease, the signal S 3 delivered by the comparator has the value 0.
- This signal S 3 therefore has the form of a periodic signal, of high frequency.
- the monostable 25 delivers a signal S 7 having the value 1 and consequently blocking the operation of the audible alarm 18. It goes without saying that the document 2 to be reported may not be displayed.
- the device 1 can for example be placed on a document 2 resting on a desk.
- the invention is not limited to the embodiments described above.
- this body 3 can also have the overall form of a pushpin intended to be placed on a bulletin board, in particular in cork.
- the body 3 can be provided with a magnet.
- the body 3 can also have the shape of a clamp intended to be fixed to a display board in order to retain the document 2 between its jaws.
- the signal emitted to attract attention by the device 4 may not be light but sound, the light-emitting diode 17 then being replaced by an audible warning.
- other means than the monostable 25 and the logical operator 26 can be provided for blocking the audible alarm 18. It can for example be a digital locking and unlocking system actuated by an external remote control.
- the device 4 for emitting a light signal can be powered by a battery replacing the photovoltaic cell 13 and the capacity 14.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Electronic Switches (AREA)
- Audible And Visible Signals (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02720065A EP1368800A1 (fr) | 2001-03-14 | 2002-03-13 | Dispositif pour signaler un document affiche |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0103474 | 2001-03-14 | ||
FR0103474A FR2822278B1 (fr) | 2001-03-14 | 2001-03-14 | Dispositif pour signaler un document affiche |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002073575A1 true WO2002073575A1 (fr) | 2002-09-19 |
Family
ID=8861117
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2002/000898 WO2002073575A1 (fr) | 2001-03-14 | 2002-03-13 | Dispositif pour signaler un document affiche |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1368800A1 (fr) |
FR (1) | FR2822278B1 (fr) |
WO (1) | WO2002073575A1 (fr) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3813155A1 (de) * | 1988-04-20 | 1989-11-02 | Fanderl Jun Eduard | Personengesteuerte werbe-text/-musik - durchsage |
US4930236A (en) * | 1988-11-29 | 1990-06-05 | Hart Frank J | Passive infrared display devices |
US5063380A (en) * | 1988-02-24 | 1991-11-05 | Kabushiki Kaisha Asahi Denshi Kenkyujyo | Discrete object searching apparatus for search of discrete files and the like |
US5450070A (en) * | 1992-03-17 | 1995-09-12 | Massar; Sheppard | Electronic missing file locator system |
-
2001
- 2001-03-14 FR FR0103474A patent/FR2822278B1/fr not_active Expired - Fee Related
-
2002
- 2002-03-13 EP EP02720065A patent/EP1368800A1/fr not_active Withdrawn
- 2002-03-13 WO PCT/FR2002/000898 patent/WO2002073575A1/fr not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5063380A (en) * | 1988-02-24 | 1991-11-05 | Kabushiki Kaisha Asahi Denshi Kenkyujyo | Discrete object searching apparatus for search of discrete files and the like |
DE3813155A1 (de) * | 1988-04-20 | 1989-11-02 | Fanderl Jun Eduard | Personengesteuerte werbe-text/-musik - durchsage |
US4930236A (en) * | 1988-11-29 | 1990-06-05 | Hart Frank J | Passive infrared display devices |
US5450070A (en) * | 1992-03-17 | 1995-09-12 | Massar; Sheppard | Electronic missing file locator system |
Also Published As
Publication number | Publication date |
---|---|
FR2822278B1 (fr) | 2006-06-02 |
EP1368800A1 (fr) | 2003-12-10 |
FR2822278A1 (fr) | 2002-09-20 |
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