DE3917556A1 - Movement detecting sensor for loudspeaker diaphragm - uses reflection light barrier positioned roughly halfway between max. and zero reflection from reflector - Google Patents

Movement detecting sensor for loudspeaker diaphragm - uses reflection light barrier positioned roughly halfway between max. and zero reflection from reflector

Info

Publication number
DE3917556A1
DE3917556A1 DE19893917556 DE3917556A DE3917556A1 DE 3917556 A1 DE3917556 A1 DE 3917556A1 DE 19893917556 DE19893917556 DE 19893917556 DE 3917556 A DE3917556 A DE 3917556A DE 3917556 A1 DE3917556 A1 DE 3917556A1
Authority
DE
Germany
Prior art keywords
reflector
light barrier
sensor
diaphragm
reflection light
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Withdrawn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
DE19893917556
Other languages
German (de)
Inventor
Oskar Hubert Richt
Stefan Magnus Richt
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DE19893917556 priority Critical patent/DE3917556A1/en
Publication of DE3917556A1 publication Critical patent/DE3917556A1/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/28—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with deflection of beams of light, e.g. for direct optical indication
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light

Abstract

The reflector used is part of the loudspeaker diaphragm, and/or the diaphragm itself. A centre bore is made in the loudspeaker's magnet. The sensor is insertable in this bore and adjustable in distance to the reflector. The bore is pref. provided with a thread so that the sensor can be screwed in and also making the distance adjustable. The loudspeaker (1) has a ring magnet (2), a circular magnet (3), a threaded bore (4) and a threaded tube (5) for firing the reflection light barrier (6) and the diaphragm (7). The latter is of aluminium and is sufficiently reflectively without further ado. ADVANTAGE - Adds no extra mechanical mass to the diaphragm or terminal leads.

Description

Die Erfindung betrifft einen Sensor zur Erfassung der Membranbewegung eines Lautsprechers. Derartige Sensoren sind bekannt, z. B. ist ein induktiver Sensor bekannt bei den eine Spule an der Membrane befestigt ist, die in Verbindung mit einem stationär angeordneten, separaten Magneten eine der Geschwindigkeit proportionale Spannung erzeugt. Es ist auch ein optischer Sensor bekannt, bei dem ein Keil an der Membrane befestigt ist, der in eine Lichtschranke eintaucht und ein der Bewegung der Membrane proportionales Signal abgibt. Es sind auch Sensoren bekannt, die die Beschleunigung der Membrane dadurch erfassen, daß an der Membrane ein Keramikplättchen be­ festigt ist, dessen Piezoeffekt ein der Beschleunigung proportionales Signal abgibt.The invention relates to a sensor for detecting the Membrane movement of a loudspeaker. Such sensors are known, e.g. B. an inductive sensor is known at which a coil is attached to the membrane, which in Connection with a stationary, separate Magnet a voltage proportional to the speed generated. An optical sensor is also known which has a wedge attached to the membrane that fits into a Photoelectric sensor immersed and one of the movement of the membrane proportional signal. There are also sensors known that the acceleration of the membrane detect that a ceramic plate on the membrane be is solidified, the piezo effect of acceleration proportional signal.

Nachteilig bei den bekannten Beispielen ist, daß jeweils auf der Membrane ein mechanisches Teil befestigt werden muß, wodurch dessen Masse vergrößert wird. Bei den induk­ tiven Sensoren und den Piezosensoren ist es außerdem nachteilig, daß noch elektrische Anschlüsse von der Membrane herausgeführt werden müssen.A disadvantage of the known examples is that a mechanical part is attached to the membrane must, whereby its mass is increased. In the induc It is also tive sensors and the piezo sensors disadvantageous that electrical connections from the Membrane must be led out.

Aufgabe der Erfindung ist es deshalb, einen Sensor der eingangs genannten Gattung zu schaffen, der die Nachteile der bekannten Sensoren vermeidet. The object of the invention is therefore a sensor to create the type mentioned above, the disadvantages avoids the known sensors.  

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß eine Reflexionslichtschranke verwendet wird, die so ange­ ordnet ist, daß ihr Abstand zum Reflektor etwa mittig zwischen null und dem Abstand der maximalen Reflexion ist.According to the invention, this object is achieved in that a reflection light barrier is used, which is so is that their distance to the reflector is approximately in the middle between zero and the distance of the maximum reflection is.

Eine Reflexionslichtschranke üblicher Bauweise ist in diesem Bereich ihrer Kennlinie, bei großer Steilheit weitgehend linear. Sie eignet sich deshalb gut zum Erfas­ sen einer Membranbewegung, insbesondere bei Hoch- und Mitteltonlautsprecher, die nur einen relativ kleinen Hub für die Signalwiedergabe benötigen.A reflection light barrier of conventional design is in this area of their characteristic, with great steepness largely linear. It is therefore well suited for detection sen a membrane movement, especially in high and Mid-range speakers that only have a relatively small drop need for signal reproduction.

Für größere Membranhübe, z. B. eines Tieftonlautsprechers, braucht nur die Geometrie der Reflexionslichtschranke etwa proportional verändert zu werden, die Charakteristik der Kennlinie bleibt dann voll erhalten.For larger diaphragm strokes, e.g. B. a woofer, only needs the geometry of the retro-reflective sensor the characteristic to be changed proportionally the characteristic curve is then fully retained.

Ein weiterer Vorteil ist, daß keine zusätzlichen mecha­ nischen Teile auf der Membrane befestigt werden müssen. Ein Farbfleck mit guten Reflexionseigenschaften an einer geeigneten Stelle der Membrane ist völlig ausreichend. Weitere vorteilhafte Ausgestaltungen der Erfindung erge­ ben sich aus den Unteransprüchen.Another advantage is that no additional mecha African parts must be attached to the membrane. A patch of color with good reflective properties on one suitable position of the membrane is completely sufficient. Other advantageous embodiments of the invention are derived from the subclaims.

Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand einer Zeichnung näher erläutert. Die Zeichnung zeigt inAn embodiment of the invention is as follows explained in more detail using a drawing. The drawing shows in

Fig. 1 ein Diagramm der Kennlinie einer üblichen Re­ flexionslichtschranke, Fig. 1 is a diagram of the characteristic curve of a conventional flexionslichtschranke Re,

Fig. 2 einen Kalottenlautsprecher im Schnitt mit ange­ ordneter Reflexionslichtschranke. Fig. 2 shows a spherical speaker in section with an arranged reflection light barrier.

Fig. 1 zeigt die Kennlinie einer Reflexionslichtschranke und zwar den Kollektorstrom des Phototransistors in Abhängigkeit vom Abstand zum Reflektor bei konstanter Beleuchtung. Im Abstandsbereich null bis maximaler Refle­ xion sieht man deutlich den steilen und linearen Verlauf der Kennlinie. Fig. 1 shows the characteristic curve of a reflection light barrier, namely the collector current of the phototransistor as a function of the distance to the reflector with constant illumination. In the distance range from zero to maximum reflection, you can clearly see the steep and linear course of the characteristic.

Fig. 2 zeigt einen Lautsprecher 1 mit einem Magnetring 2, einem Magnetkreis 3, einer Gewindebohrung 4, einem Gewinderohr 5 mit der daran befestigten Reflexionslicht­ schranke 6 und der Membrane 7. Diese Membrane ist aus Aluminium gefertigt und ohne weitere Vorkehrungen aus­ reichend reflektierend. Fig. 2 shows a loudspeaker 1 with a magnetic ring 2 , a magnetic circuit 3 , a threaded bore 4 , a threaded tube 5 with the reflection light barrier 6 attached thereto and the membrane 7 . This membrane is made of aluminum and is sufficiently reflective without further precautions.

Claims (4)

1. Sensor zur Erfassung der Membranbewegung eines Laut­ sprechers, dadurch gekennzeichnet, daß eine Re­ flexionslichtschranke verwendet wird, die so angeordnet ist, daß ihr Abstand zum Reflektor etwa mittig zwischen null und dem Abstand der maximalen Reflexion ist.1. Sensor for detecting the membrane movement of a speaker, characterized in that a Re flexion light barrier is used, which is arranged so that its distance from the reflector is approximately in the middle between zero and the distance of the maximum reflection. 2. Sensor nach Anspruch 1, dadurch gekennzeichnet, daß der Reflektor ein Teil der Lautsprecher Membrane und /oder die Membrane selbst ist (Fig. 2).2. Sensor according to claim 1, characterized in that the reflector is part of the speaker membrane and / or the membrane itself ( Fig. 2). 3. Sensor nach Anspruch 1 und 2, dadurch gekennzeichnet, daß der Magnet des Lautsprechers eine Mittenbohrung aufweist, in die der Sensor einschiebbar und der Abstand zum Reflektor justierbar ist.3. Sensor according to claim 1 and 2, characterized in that the magnet of the speaker has a center hole has, in which the sensor can be inserted and the Distance to the reflector is adjustable. 4. Sensor nach Anspruch 1 bis 3, dadurch gekennzeichnet, daß in der Mittenbohrung des Magneten ein Gewinde angeordnet ist, in das der Sensor einschraubbar und damit der Abstand zum Reflektor justierbar ist.4. Sensor according to claim 1 to 3, characterized in that a thread in the center hole of the magnet is arranged, in which the sensor can be screwed and so that the distance to the reflector is adjustable.
DE19893917556 1989-05-30 1989-05-30 Movement detecting sensor for loudspeaker diaphragm - uses reflection light barrier positioned roughly halfway between max. and zero reflection from reflector Withdrawn DE3917556A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19893917556 DE3917556A1 (en) 1989-05-30 1989-05-30 Movement detecting sensor for loudspeaker diaphragm - uses reflection light barrier positioned roughly halfway between max. and zero reflection from reflector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19893917556 DE3917556A1 (en) 1989-05-30 1989-05-30 Movement detecting sensor for loudspeaker diaphragm - uses reflection light barrier positioned roughly halfway between max. and zero reflection from reflector

Publications (1)

Publication Number Publication Date
DE3917556A1 true DE3917556A1 (en) 1990-12-06

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DE19893917556 Withdrawn DE3917556A1 (en) 1989-05-30 1989-05-30 Movement detecting sensor for loudspeaker diaphragm - uses reflection light barrier positioned roughly halfway between max. and zero reflection from reflector

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992014991A1 (en) * 1991-02-20 1992-09-03 MAX-PLANCK-Gesellschaft zur Förderung der Wissenschaften e.V. Optical displacement or deformation measurement process and device
DE10207962A1 (en) * 2002-02-18 2003-08-28 Unitedscreens Media Ag Audiovisual presentation system used in e.g. airports and railway stations, employs row of small loudspeakers
US20160302018A1 (en) * 2015-04-09 2016-10-13 Audera Acoustics Inc. Acoustic transducer systems with position sensing
US10516957B2 (en) 2014-11-28 2019-12-24 Audera Acoustics Inc. High displacement acoustic transducer systems

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2140126A1 (en) * 1970-08-12 1972-02-17 Compteurs Comp D Optical comparator
DE3331175A1 (en) * 1982-09-01 1984-03-01 Topwave Instruments OY, 00380 Helsinki METHOD AND DEVICE FOR MEASURING SHORT DISTANCES
DE3422963C2 (en) * 1983-06-25 1985-05-30 Erwin 2800 Bremen Schumacher Optoelectronic converter
DE3426231C2 (en) * 1984-07-17 1986-11-06 T+A elektroakustik GmbH, 4900 Herford Device for negative feedback from a loudspeaker
DE3625569A1 (en) * 1986-07-29 1987-01-08 Ultrasonics Schallfeld Messtec Circuit for reducing intermodulation in loudspeakers
US4661695A (en) * 1984-03-05 1987-04-28 Nippon Soken, Inc. Optical apparatus and method for detecting the top dead center position of an engine piston

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2140126A1 (en) * 1970-08-12 1972-02-17 Compteurs Comp D Optical comparator
DE3331175A1 (en) * 1982-09-01 1984-03-01 Topwave Instruments OY, 00380 Helsinki METHOD AND DEVICE FOR MEASURING SHORT DISTANCES
DE3422963C2 (en) * 1983-06-25 1985-05-30 Erwin 2800 Bremen Schumacher Optoelectronic converter
US4661695A (en) * 1984-03-05 1987-04-28 Nippon Soken, Inc. Optical apparatus and method for detecting the top dead center position of an engine piston
DE3426231C2 (en) * 1984-07-17 1986-11-06 T+A elektroakustik GmbH, 4900 Herford Device for negative feedback from a loudspeaker
DE3625569A1 (en) * 1986-07-29 1987-01-08 Ultrasonics Schallfeld Messtec Circuit for reducing intermodulation in loudspeakers

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DE-Z: WIEMANN, Lothar: Dem Ideal nähergekommen. In: Funkschau 1, 1987, H. 1, S. 45-48 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992014991A1 (en) * 1991-02-20 1992-09-03 MAX-PLANCK-Gesellschaft zur Förderung der Wissenschaften e.V. Optical displacement or deformation measurement process and device
DE10207962A1 (en) * 2002-02-18 2003-08-28 Unitedscreens Media Ag Audiovisual presentation system used in e.g. airports and railway stations, employs row of small loudspeakers
US10516957B2 (en) 2014-11-28 2019-12-24 Audera Acoustics Inc. High displacement acoustic transducer systems
US20160302018A1 (en) * 2015-04-09 2016-10-13 Audera Acoustics Inc. Acoustic transducer systems with position sensing
US10034109B2 (en) * 2015-04-09 2018-07-24 Audera Acoustics Inc. Acoustic transducer systems with position sensing
US20180376269A1 (en) * 2015-04-09 2018-12-27 Audera Acoustics Inc. Acoustic transducer systems with position sensing

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8141 Disposal/no request for examination