EP0712059B1 - Circuit for driving a piezo-electric vibrator - Google Patents
Circuit for driving a piezo-electric vibrator Download PDFInfo
- Publication number
- EP0712059B1 EP0712059B1 EP95117055A EP95117055A EP0712059B1 EP 0712059 B1 EP0712059 B1 EP 0712059B1 EP 95117055 A EP95117055 A EP 95117055A EP 95117055 A EP95117055 A EP 95117055A EP 0712059 B1 EP0712059 B1 EP 0712059B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- vibrator
- transistor
- switching means
- circuit
- series connection
- 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 - Lifetime
Links
- 230000000903 blocking effect Effects 0.000 claims description 8
- 230000000737 periodic effect Effects 0.000 claims description 3
- 230000005284 excitation Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/0207—Driving circuits
- B06B1/0223—Driving circuits for generating signals continuous in time
- B06B1/0238—Driving circuits for generating signals continuous in time of a single frequency, e.g. a sine-wave
-
- G—PHYSICS
- G04—HOROLOGY
- G04G—ELECTRONIC TIME-PIECES
- G04G13/00—Producing acoustic time signals
- G04G13/02—Producing acoustic time signals at preselected times, e.g. alarm clocks
- G04G13/021—Details
Definitions
- the present invention relates to a control circuit a piezoelectric vibrator.
- a vibrator is intended in particular to equip an electronic watch with a device acoustic alarm.
- the noise level that can be reached with such a circuit is limited, which constitutes a disadvantage for applications to acoustic alarms. Indeed, the amount of energy that the coil can store is depending on its volume, i.e. its number of turns and the diameter of the wire which constitutes it. As we wish to incorporate the control circuit in a watch for example, we understand that this circuit should not be too big.
- the object of the present invention is to provide a solution to these problems by presenting a circuit of control of a piezoelectric vibrator which is simple to construction, which is not expensive, and which allows reach a very high noise level, without the dimensions of this circuit become too large, for that it can be incorporated into a watch for example.
- the solution recommended by the invention consists in supply a piezoelectric vibrator by two ways power supply, each including a coil. So the vibrator can be kept on continuously and he is most excited. Indeed, the vibrator is excited in both directions from its position of rest and so it has a larger displacement than the vibrator of the prior art. We therefore understand that, even if the efficiency of this circuit is reduced, the noise level will be higher compared to art circuits prior.
- Figure 1 schematically shows a circuit of control of a piezoelectric vibrator according to the invention.
- the circuit includes a voltage source power supply 1, for example a 3 volt source, supplying two electrical branches.
- Each branch includes a series connection of a coil 2, 2 'and a diode 3, 3 ', this connection being connected by means a first terminal A, A 'at the high voltage level of the source 1.
- A first terminal
- A 'at the high voltage level of the source 1.
- Each connection is also connected, via a second terminal B, B ', at switching means, for example transistors T1, T2.
- Each transistor T1, T2 is connected by its emitter to the low voltage level from source 1 so that a current can flow through each branch when a transistor is in the conducting state.
- the position of the serial connection and the transistor can be reversed.
- the common terminal of transistors will be the terminal connected to the high voltage level instead of the terminal which is connected to the voltage level bottom of source 1 in the example given.
- a piezoelectric vibrator 4 such that a piezoelectric membrane is connected between the two terminals B, B '.
- Each transistor T1, T2 is controlled respectively by a periodic control signal S1 and S2 applied to its base.
- Signal S2 is out of phase with the signal S1, for example 180 °, so that when the transistor T1 is put in conductive state by the control signal S1, the other transistor T2 is maintained in a state of blocking by control signal S2.
- the control signals S1, S2 are for example pulse signals, each side of which changes the state of transistors T1 and T2 respectively.
- transistor T2 When the transistor T2 is put in conductive state, transistor T1 is put in blocking state, and an electric current flows to through coil 2 'and diode 3' from the source of direct voltage 1 passing through transistor T2, the coil 2 'thus storing the corresponding energy.
- the transistor T1 goes to the state driver thanks to its control signal S1
- the transistor T2 therefore goes into the blocking state under the action its S2 control signal, out of phase with the signal S1.
- the voltage induced in the coil 2 ' will then applied to the terminals of vibrator 4 to excite it.
- a current flows through the coil 2 and the diode 3 from the DC voltage source 1 by the transistor T1, and coil 2 then stores energy corresponding.
- Vibrator 4 is therefore kept energized continuously by the voltage induced either by the coil 2, or by the coil 2 '. If the frequency of changes of the voltage applied to vibrator 4 corresponds to the resonant frequency of the vibrator, it will be excited in a maximum way.
- FIG. 2 schematically represents this excitation of the vibrator 4.
- the voltage applied by the coil 2 energizes vibrator 4 in a first direction by relative to its rest position, for example, in the sense upwards indicated by the dotted line in the figure 2.
- the voltage applied by the coil 2 ' will excite the vibrator 4 then in the other direction, for example down as also shown in Figure 2, at the time of change of state of transistors T1, T2 as was explained above.
- the vibrator 4 is therefore attacked in alternating and vibrating in both directions, so comparable to the diaphragm of a speaker, and its displacement d is greater than if it were only excited in one direction.
- control circuit according to the invention makes it possible to obtain a two-tone alarm, similar to a police alarm, by the use of control signals S1 and S2 which have frequencies slightly different.
- control signals S1 and S2 which have frequencies slightly different.
- the control circuit of the invention can then advantageously be used in a wristwatch with alarm device.
- the circuit according to the invention allows achieve, with a watch battery, a noise level of around 110 dB at 10 cm, which obviously depends on the size of the piezoelectric vibrator and the cavity in which it is placed.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Oscillators With Electromechanical Resonators (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
- Electromechanical Clocks (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
- Electric Clocks (AREA)
- Electronic Switches (AREA)
Abstract
Description
La présente invention concerne un circuit de commande d'un vibreur piézo-électrique. Un tel vibreur est destiné notamment à équiper une montre électronique à dispositif d'alarme acoustique.The present invention relates to a control circuit a piezoelectric vibrator. Such a vibrator is intended in particular to equip an electronic watch with a device acoustic alarm.
On connaít déjà des circuits de commande d'un vibreur piézo-électrique, par exemple grâce au brevet américain US-A-4 232 241. Ce document décrit un tel circuit qui comprend une branche comportant une bobine et une diode connectées en série, et un vibreur piézo-électrique connecté en parallèle avec la branche formant ainsi un circuit parallèle. Un côté de ce circuit parallèle est connecté à une source d'alimentation, tandis que l'autre coté de ce circuit parallèle est connecté à un transistor, connecté lui aussi à la source. Pendant que le transistor est à l'état conducteur, un courant circule à travers la branche et le transistor, et la bobine emmagasine l'énergie électromagnétique correspondante. Quand le transistor est mis à l'état de blocage, le courant circule dans le circuit parallèle, et la tension induite dans la bobine est alors appliquée aux bornes du vibreur afin d'exciter ce dernier.We already know control circuits of a vibrator piezoelectric, for example thanks to the American patent US-A-4 232 241. This document describes such a circuit which includes a branch with a coil and a diode connected in series, and a piezoelectric vibrator connected in parallel with the branch thus forming a parallel circuit. One side of this parallel circuit is connected to a power source, while the other side of this parallel circuit is connected to a transistor, also connected to the source. While the transistor is in the conductive state, a current flows through the branch and the transistor, and the coil stores the corresponding electromagnetic energy. When the transistor is put in blocking state, current flows in the parallel circuit, and the voltage induced in the coil is then applied across the vibrator so to excite the latter.
Toutefois, le niveau sonore pouvant être atteint avec un tel circuit est limité, ce qui constitue un désavantage pour les applications à des alarmes acoustiques. En effet, la quantité d'énergie que la bobine peut emmagasiner est fonction de son volume, c'est-à-dire de son nombre de spires et du diamètre du fil qui la constitue. Comme l'on souhaite incorporer le circuit de commande dans une montre par exemple, on comprend que ce circuit ne doit pas être trop grand.However, the noise level that can be reached with such a circuit is limited, which constitutes a disadvantage for applications to acoustic alarms. Indeed, the amount of energy that the coil can store is depending on its volume, i.e. its number of turns and the diameter of the wire which constitutes it. As we wish to incorporate the control circuit in a watch for example, we understand that this circuit should not be too big.
Le but de la présente invention est d'apporter une solution à ces problèmes en présentant un circuit de commande d'un vibreur piézo-électrique qui est simple de construction, qui ne coûte pas cher, et qui permet d'atteindre un niveau sonore très élevé, sans que les dimensions de ce circuit deviennent trop grandes, pour qu'il puisse être incorporé dans une montre par exemple.The object of the present invention is to provide a solution to these problems by presenting a circuit of control of a piezoelectric vibrator which is simple to construction, which is not expensive, and which allows reach a very high noise level, without the dimensions of this circuit become too large, for that it can be incorporated into a watch for example.
Ce but est atteint grâce aux caractéristiques
particulières que présente le circuit de commande de la
revendication 1.This goal is achieved thanks to the characteristics
features of the control circuit of the
La solution préconisée par l'invention consiste à alimenter un vibreur piézo-électrique par deux voies d'alimentation, chacune comprenant une bobine. Ainsi, le vibreur peut être maintenu sous tension continuellement et il est excité d'une façon maximale. En effet, le vibreur est excité dans les deux sens par rapport à sa position de repos et il a donc un déplacement plus grand que le vibreur de l'art antérieur. On comprend donc que, même si le rendement de ce circuit est diminué, le niveau sonore sera plus élevé par rapport aux circuits de l'art antérieur.The solution recommended by the invention consists in supply a piezoelectric vibrator by two ways power supply, each including a coil. So the vibrator can be kept on continuously and he is most excited. Indeed, the vibrator is excited in both directions from its position of rest and so it has a larger displacement than the vibrator of the prior art. We therefore understand that, even if the efficiency of this circuit is reduced, the noise level will be higher compared to art circuits prior.
D'autres caractéristiques et avantages de l'invention apparaítront mieux à la lecture de la description détaillée qui suit, et qui sera faite en se référant aux dessins annexés, donnés à titre d'exemple uniquement, dans lesquels :
- la figure 1 représente schématiquement un circuit de commande d'un vibreur piézo-électrique selon l'invention, et
- la figure 2 représente schématiquement l'excitation du vibreur piézo-électrique par le circuit de la figure 1.
- FIG. 1 schematically represents a control circuit for a piezoelectric vibrator according to the invention, and
- FIG. 2 schematically represents the excitation of the piezoelectric vibrator by the circuit of FIG. 1.
La figure 1 représente schématiquement un circuit de commande d'un vibreur piézo-électrique selon l'invention.Figure 1 schematically shows a circuit of control of a piezoelectric vibrator according to the invention.
Le circuit comprend une source de tension
d'alimentation 1, par exemple une source de 3 volts,
alimentant deux branches électriques. Chaque branche
comporte un raccordement en série d'une bobine 2, 2' et
d'une diode 3, 3', ce raccordement étant connecté au moyen
d'une première borne A, A' au niveau de tension haut de la
source 1. Bien entendu, la position de la bobine 2
respectivement 2' et de la diode 3 respectivement 3', peut
être inversée. Chaque raccordement est en outre connecté,
par l'intermédiaire d'une deuxième borne B, B', à des
moyens commutateurs, par exemple des transistors T1, T2.
Chaque transistor T1, T2 est connecté par son émetteur au
niveau de tension bas de la source 1 de sorte qu'un
courant peut circuler dans chaque branche quand un
transistor est à l'état conducteur. Bien entendu, ici
aussi, la position du raccordement série et du transistor
peut être inversée. Dans ce cas, la borne commune des
transistors sera la borne reliée au niveau de tension haut
au lieu de la borne qui est reliée au niveau de tension
bas de la source 1 dans l'exemple donné. Un vibreur piézo-électrique
4 tel qu'une membrane piézo-électrique est
connecté entre les deux bornes B, B'.The circuit includes a voltage
Chaque transistor T1, T2 est commandé respectivement par un signal périodique de commande S1 et S2 appliqué à sa base. Le signal S2 est déphasé par rapport au signal S1, par exemple de 180°, de sorte que quand le transistor T1 est mis en état conducteur par le signal de commande S1, l'autre transistor T2 est maintenu dans un état de blocage par le signal de commande S2.Each transistor T1, T2 is controlled respectively by a periodic control signal S1 and S2 applied to its base. Signal S2 is out of phase with the signal S1, for example 180 °, so that when the transistor T1 is put in conductive state by the control signal S1, the other transistor T2 is maintained in a state of blocking by control signal S2.
Les signaux de commande S1, S2 sont par exemple des
signaux d'impulsions, dont chaque flanc change l'état des
transistors T1 et T2 respectivement. Lorsque le transistor
T2 est mis en état conducteur, le transistor T1 est mis en
état de blocage, et un courant électrique circule à
travers la bobine 2' et la diode 3' depuis la source de
tension continue 1 en passant par le transistor T2, la
bobine 2' emmagasinant ainsi l'énergie correspondante.The control signals S1, S2 are for example
pulse signals, each side of which changes the state of
transistors T1 and T2 respectively. When the transistor
T2 is put in conductive state, transistor T1 is put in
blocking state, and an electric current flows to
through coil 2 'and diode 3' from the source of
Au moment où le transistor T1 passe à l'état
conducteur grâce à son signal de commande S1, le
transistor T2 passe donc à l'état de blocage sous l'action
de son signal de commande S2, déphasé par rapport au
signal S1. La tension induite dans la bobine 2' sera alors
appliquée aux bornes du vibreur 4 pour l'exciter. D'autre
part, un courant circule à travers la bobine 2 et la diode
3 depuis la source de tension continue 1 par le transistor
T1, et la bobine 2 emmagasine alors l'énergie
correspondante.At the moment when the transistor T1 goes to the state
driver thanks to its control signal S1, the
transistor T2 therefore goes into the blocking state under the action
its S2 control signal, out of phase with the
signal S1. The voltage induced in the coil 2 'will then
applied to the terminals of
Le vibreur 4 est donc maintenu sous tension
continuellement par la tension induite soit par la bobine
2, soit par la bobine 2'. Si la fréquence des changements
de la tension appliquée au vibreur 4 correspond à la
fréquence de résonance du vibreur, celui-ci sera excité
d'une façon maximale.
La figure 2 représente schématiquement cette
excitation du vibreur 4. La tension appliquée par la
bobine 2 excite le vibreur 4 dans un premier sens par
rapport à sa position de repos, par exemple, dans le sens
vers le haut indiqué par la ligne pointillée à la figure
2. La tension appliquée par la bobine 2' excitera le
vibreur 4 alors dans l'autre sens, par exemple vers le bas
comme également indiqué à la figure 2, au moment du
changement d'état des transistors T1, T2 comme cela a été
expliqué ci-dessus. Le vibreur 4 est donc attaqué en
alternance et vibre dans les deux sens, de façon
comparable à la membrane d'un haut parleur, et son
déplacement d est plus grand que s'il n'était excité que
dans un seul sens.Figure 2 schematically represents this
excitation of the
Avantageusement, le circuit de commande selon l'invention permet d'obtenir une alarme à deux tons, semblable à une alarme de police, par l'utilisation des signaux de commande S1 et S2 qui ont des fréquences légèrement différentes. Bien entendu, il est également possible d'obtenir une alarme à quatre tons avec le circuit de l'invention par l'utilisation d'un balayage de fréquences des signaux de commande d'une façon connue de l'homme de métier.Advantageously, the control circuit according to the invention makes it possible to obtain a two-tone alarm, similar to a police alarm, by the use of control signals S1 and S2 which have frequencies slightly different. Of course, it is also possible to get a four tone alarm with the circuit of the invention by the use of a scan of frequencies of control signals in a known way of the skilled person.
Ainsi, on obtient un circuit pouvant atteindre un niveau sonore plus élevé que les circuits connus de l'art antérieur, sans que le circuit devienne beaucoup plus grand.Thus, we obtain a circuit that can reach a higher sound level than circuits known in the art previous, without the circuit becoming much more tall.
Le circuit de commande de l'invention peut alors avantageusement être utilisé dans une montre-bracelet à dispositif d'alarme. Le circuit selon l'invention permet d'atteindre, avec une pile horlogère, un niveau sonore de l'ordre de 110 dB à 10 cm, qui dépend évidemment de la grandeur du vibreur piézo-électrique et de la cavité dans laquelle il est placé.The control circuit of the invention can then advantageously be used in a wristwatch with alarm device. The circuit according to the invention allows achieve, with a watch battery, a noise level of around 110 dB at 10 cm, which obviously depends on the size of the piezoelectric vibrator and the cavity in which it is placed.
Claims (4)
- Control circuit for a piezoelectric vibrator comprising :a first branch comprising :first switching means (T1) arranged to be put into its blocking and into its conducting state following the reception of a first periodic control signal (S1), anda first series connection of a coil (2) and a diode (3), a first terminal (A) of said first series connection being connected to a voltage supply source (1) and a second terminal (B) of said first series connection being connected to said first switching means (T1), characterized in that it further comprisesa second branch comprising :said vibrator (4) being connected between said second terminals (B, B') in such a way that when said first switching means (T1) are in the blocking state, said second switching (T2) are in the conducting state and are electrically connected in series with said vibrator (4) and with said first series connection (2,3), while when said second switching means (T2) are in the blocking state, said first switching means (T1) are in the conducting state and are electrically connected in series with said vibrator (4) and with said second series connection (2',3').second switching means (T2) arranged to go into its blocking and into its conducting state following the reception of a second periodic control signal (S2), anda second series connection of a coil (2') and a diode (3'), a first terminal (A') of said second series connection being connected to said voltage supply source (1) and a second terminal (B') of said second series connection being connected to said second switching means (T2),
- Circuit according to claim 1, characterized in that said switching means, each comprises a transistor each having a base to which one of said first and second control signals (S1,S2) is applied and each having a path collector-emitter connected to said second terminals (B, B').
- Circuit according to claim 1 or 2, characterized in that said second control signal (S2) is dephased by 180° with respect to said first control signal (S1).
- Watch having an acoustic alarm device, characterized in that it comprises a control circuit according to any of the claim 1, 2 or 3.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH03333/94A CH687115B5 (en) | 1994-11-08 | 1994-11-08 | Control circuit for a piezoelectric vibrator. |
| CH3333/94 | 1994-11-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0712059A1 EP0712059A1 (en) | 1996-05-15 |
| EP0712059B1 true EP0712059B1 (en) | 1998-06-17 |
Family
ID=4253710
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95117055A Expired - Lifetime EP0712059B1 (en) | 1994-11-08 | 1995-10-30 | Circuit for driving a piezo-electric vibrator |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US5635788A (en) |
| EP (1) | EP0712059B1 (en) |
| JP (1) | JPH08233957A (en) |
| CN (1) | CN1084001C (en) |
| AT (1) | ATE167581T1 (en) |
| AU (1) | AU694567B2 (en) |
| CH (1) | CH687115B5 (en) |
| DE (1) | DE69503021T2 (en) |
| SG (1) | SG45119A1 (en) |
| TW (1) | TW371729B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19644521A1 (en) * | 1996-10-25 | 1998-04-30 | Siemens Ag | Method and device for controlling a capacitive actuator |
| CH691089A5 (en) * | 1997-05-14 | 2001-04-12 | Asulab Sa | timepiece associated with a compass and a viewfinder. |
| DE19825210C2 (en) * | 1998-04-23 | 2003-09-25 | Gsg Elektronik Gmbh | Circuit arrangement for dynamic control of ceramic solid state actuators |
| JP5865029B2 (en) * | 2011-11-18 | 2016-02-17 | 矢崎エナジーシステム株式会社 | Alarm |
| CN102836811A (en) * | 2012-07-30 | 2012-12-26 | 西安思坦仪器股份有限公司 | Stimulating method and stimulating circuit for piezoelectric ceramic transducer |
| JP6308788B2 (en) * | 2013-03-27 | 2018-04-11 | セイコーインスツル株式会社 | Electronic device and impact detection method |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2279254A1 (en) * | 1974-07-16 | 1976-02-13 | Gaboriaud Paul | High frequency thyristor generator for ultrasonic atomiser - has thyristor triggered from subharmonic of crystal oscillator |
| JPS5744398Y2 (en) | 1977-05-26 | 1982-09-30 | ||
| NL7805804A (en) * | 1978-05-29 | 1979-12-03 | Philips Nv | DEVICE FOR APPLYING A CONTROL VOLTAGE OVER A PIEEZO ELECTRICAL POSITIONING ELEMENT. |
| NL7805802A (en) * | 1978-05-29 | 1979-12-03 | Philips Nv | DEVICE FOR CONTROLLING A PIEEZO ELECTRICAL POSITIONING ELEMENT. |
| DE3230218A1 (en) * | 1982-08-13 | 1984-02-23 | Braun Ag, 6000 Frankfurt | Electronic clock or clock radio with an alarm signal of differing loudness level |
| US4714935A (en) * | 1983-05-18 | 1987-12-22 | Canon Kabushiki Kaisha | Ink-jet head driving circuit |
| JPH01264575A (en) * | 1988-04-13 | 1989-10-20 | Toyota Motor Corp | Driver device for piezoelectric element |
-
1994
- 1994-11-08 CH CH03333/94A patent/CH687115B5/en not_active IP Right Cessation
-
1995
- 1995-10-18 SG SG1995001582A patent/SG45119A1/en unknown
- 1995-10-30 AT AT95117055T patent/ATE167581T1/en not_active IP Right Cessation
- 1995-10-30 DE DE69503021T patent/DE69503021T2/en not_active Expired - Lifetime
- 1995-10-30 EP EP95117055A patent/EP0712059B1/en not_active Expired - Lifetime
- 1995-11-06 AU AU36697/95A patent/AU694567B2/en not_active Ceased
- 1995-11-06 US US08/553,898 patent/US5635788A/en not_active Expired - Lifetime
- 1995-11-07 CN CN95118942.5A patent/CN1084001C/en not_active Expired - Fee Related
- 1995-11-07 TW TW084111790A patent/TW371729B/en not_active IP Right Cessation
- 1995-11-08 JP JP7313713A patent/JPH08233957A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| TW371729B (en) | 1999-10-11 |
| DE69503021T2 (en) | 1999-02-11 |
| HK1012168A1 (en) | 1999-07-23 |
| SG45119A1 (en) | 1998-01-16 |
| AU3669795A (en) | 1996-05-16 |
| JPH08233957A (en) | 1996-09-13 |
| AU694567B2 (en) | 1998-07-23 |
| EP0712059A1 (en) | 1996-05-15 |
| ATE167581T1 (en) | 1998-07-15 |
| US5635788A (en) | 1997-06-03 |
| DE69503021D1 (en) | 1998-07-23 |
| CN1129821A (en) | 1996-08-28 |
| CN1084001C (en) | 2002-05-01 |
| CH687115GA3 (en) | 1996-09-30 |
| CH687115B5 (en) | 1997-03-27 |
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