DE7140136U - Remote control input circuit - Google Patents

Description

9-3.1973 6808-IV / He.

Ms. Sauter AG, electrical apparatus factory, Basel, Im Surinam 55 (Switzerland)

"Remote control input circuit ¹¹

The innovation concerns a remote control input circuit for resonance receivers with electromagnetic excitation of a mechanical, Swing tongue tuned to the resonance frequency, at the freely swinging end of which a rotatably mounted The rotor is coupled in a defined manner by means of a ferromagnetic cutting edge via an air gap, and the rotor is at a standstill Swing tongue is held in its rest position.

In these devices, the vibration of a mechanically vibratable element acts via an auxiliary air gap on an adjustable switching element to be scanned in the direction of oscillation.

The mechanical input circuit consists of a piltering element for high resonance sharpness, e.g. one clamped on one side Vibrating tongue, which is excited electromagnetically or by a piezoelectric vibrator. This swing tongue is used thus as a filter and furthermore, a rotor made of non-ferromagnetic To hold material that contains a permanent magnet in a defined rest position or to rotate it to trigger the switching process.

In the simplest type of reso-

nanzempfänger is attached to the schwlngungefähigen element, a contact, which with a fixed counter contact at a etijnmfcen h # § _e hwingungsamplitucie gum Kontaktschiuß comes.

However, this method has significant disadvantages, since the contact closure, which fluctuates in the rhythm of the oscillation frequency, is insufficient for proper switching function.

In addition, the contacts are mechanically and electrically stressed by the constant closing and opening, which results in rapid wear.

Furthermore, a device is known in which the vibrating tongue acts on a friction wheel, which is preferably covered with runasi on its circumference. The tongue begins to swing so the friction wheel is moved forward at a certain angle with each tongue stroke, so that after a number of periods one Summing up of these movements takes place, which is sufficient to turn the wheel through a significant angle, thereby causing the

Switching process is triggered. j

This arrangement has the disadvantage that when using rela- j tively short pulses, the time required to add up the individual strokes is too long and furthermore for practical implementation a relatively large number of individual mechanical parts is required in order to function satisfactorily in all parts to reach. Furthermore, there are a number of practical problems, the solution of which requires additional mechanical effort, such as a resilient suspension of this device require.

Another known device has a vibrating tongue which is electromagnetically excited, the vibrating

tongue acts on a rotor, which when the tongue is stationary held in its rest position and by swinging the tongue a separately arranged permanent magnet is deflected. The rotor has a moving contact which, in the event of its deflection, is moved against a stationary contact, which triggers the switching process. This arrangement solves the problem of high selection in that the quality of the vibrating tongue is sufficiently high or by a corresponding dimensioning can be achieved has but the disadvantage that the entire arrangement is mechanically very; is sensitive and the storage of the rotor is very precise must be performed. j

In addition, the contact closure of this known arrangement!

There is no hysteresis whatsoever. In addition, since the contact pressure j

may only be very small, is not a satisfactory large i

To achieve switching capacity and the lack of hysteresis leads to I.

Too much bouncing and therefore sensitive to aging-! ability of this facility.

Also known are electronically structured input i

circles; these are filter arrangements or filter circuits,!

either with LC circles or, more recently, with active ones >

Filter. These arrangements have the disadvantage that a high selection can only be achieved with great effort. There

through the use of ripple control frequencies * .. according to frequency j

plan standardization only allowed an extremely small bandwidth 1st, j

a high selection is generally required. This applies ι especially for low frequencies, which have an aggravating smell

de fact of the large inductance and capacitance for such! - j

ge electronic circuits, as far as they use LC-Krelse, j

come in addition. ·

In addition, there is., With electronic input circuits that Problem of protecting the relatively voltage-sensitive components against high-voltage impulses, which every heavy current

71A013617. p. 73

-H-

network are inevitably superimposed. This protection requires a considerable amount of components.

According to the innovation, these disadvantages of the known arrangement are avoided in that the non-ferromagnetic rotor contains a permanent magnet and has a radial recess in which a fixed reed contact it is arranged that in the rest position the first magnetic field generated by the permanent magnet between the rotor cutting edge and the free end of the oscillating tongue is larger than that between the permanent magnet of the rotor and the reed contact second field, and that when the tongue is vibrating, the magnetic modulation results in a change in the magnetic field Force ratio results in such a way that as a result of the rotation of the rotor, the flow through the ferromagnetic part of the reed contact increases and the contact closes.

A first magnetic field, its force, is formed between a cutting edge of the rotor and the vibrating tongue causes the rotor to be held in the rest position. There is still a second force between the rotor and an in reed contact, which is firmly arranged in its vicinity, but is weaker than the force between the rotor and the vibrating tongue.

If the tongue is vibrated by an audio frequency signal excited, the force between the rotor and the vibrating tongue experiences a modulation, which effectively leads to a change in the Force ratio between first and second force to gun- ' Most of the latter leads, so that now the force existing between the rotor and permanent magnet of the reed contact is relative predominates, causing the rotor to rotate in such a direction; is that the flow through the ferromagnetic part of the Reed contact increases and the contact closes. ■

As soon as the vibrating tongue is no longer excited, the rotor returns to its defined rest position, i.e. the force |

~ 5 -

which acts between the rotor and the vibrating tongue takes on the original value again, which was before the excitation of the vibrating tongue duration.

The movement of the rotor is limited by two stops, so that there are clear positional relationships.

According to a further development of the innovation, two rotors are used mechanically rigidly coupled to one another on the same axis, the reed contact being mounted between the two rotors in an approximately radial direction in this arrangement. This has the advantage of a fixed magnetic coupling between the two part rotors and the reed contact. This be ¹ - has an increase in responsiveness, ie the rotor tilts into the working position even at smaller amplitudes of the vibrating tongue than in the previously described embodiment.

Furthermore, due to the greater force between the two rotors and the reed contact, there is another fixed magnet to operate the reed contact superfluous. Such an additional permanent magnet is namely in the arrangement normally recommended with only one rotor.

The advantages of the arrangement according to the invention are not very mechanical moving parts, in the embodiment only the rotor, which is a simple robust construction, so that no high-precision requirements are placed on its storage either. Furthermore, the use of a commercially available Reedkentaktes as a switching element, which without difficulties a downstream relay with sufficient contact load able to switch.

In addition, the hysteresis of the reed contact results in clear switching conditions without further auxiliary measures.

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Another advantage is the small space requirement of the invention Arrangement, which corresponds to the current tendency to manufacture the smallest possible personal control receivers, a single structural molded part containing all essential structural elements.

The device according to the invention combines the advantages known per se of an electromagnetically excited, mechanical one Vibratory tongue arrangement, namely the insensitivity to mains surge voltages and a very high selection with the advantage of a compact design that can be fabricated very efficiently. With all filter circuits with a very high selection , i.e. high quality, regardless of whether it is electrically or mechanically excited, there is a problem with the behavior in the event of an unintentional occurring impulse disturbances.

For example, V / ird is the mains voltage of a remote control receiver with a vibrating tongue switched on without an audio frequency voltage being present, the vibrating tongue experiences a pulsed manner Excitation and oscillates according to its quality with a tent constant, which can cause unwanted switching.

According to a further development of the innovation, an effective remedy is given in that the amplitude of the vibration; tongue is damped by two fixed stops covered with a strong steaming material. It is essential, lent only to the extent to bring the attacks to the voice tongue than absolutely iat necessary to vibrate the vibrating tongue at normal / Prequenzbetrieb with the required stroke, which require _j 1st sary to operate the switching process. j

This limiting effect of the attacks can also be achieved by; Additional electrical switching measures can be supported or replaced by running parallel to the resonant circuit of the electromagnetic \

table excitation system the vibrating tongue attaches a damping arrangement made of diodes, optionally supplemented with a damping resistor. This switching measure also limits the level to which the vibrating tongue is made to oscillate by an interference pulse to such a value that the level required for actuating the reed contact is already below the level required for actuation of the reed contact within the switching delay time. In addition, due to its inertia, the rotor has a certain response delay time, which is necessary and desirable in this case.

In the following, the arrangements according to the invention will be described with reference to the drawings; show it:

Fig. 1 shows the basic arrangement of an input circuit

electromagnetic excitation of the vibrating element,

2 shows the structural design of the arrangement with the excitation system and a partial section of the decoupling device according to the invention,

3 shows the structural design of the arrangement with the excitation system and a plan view with partial section of the decoupling device according to the invention and

4 shows the electrical switching measure for attenuating the network-specific interference pulses.

1 shows the basic structure of an input circuit of the type known per se. The soft iron core 7 », for example made of laminated dynamo sheet, carries a coil 2 to which the audio frequency voltage superimposed on the network is fed via terminals 1. Appropriately If the coil 2 is preceded by a capacitor 3 which, in a known manner, forms a series resonance circuit with the inductance of the coil 2.

The soft iron core 7 is divided into two legs by an air gap, which form the pole shoes 7 ¹ and 7 ″. One pole of a permanent magnet 8, for example pole S, is magnetically connected to one leg of the soft iron core 7, while the other pole N facing away from the soft iron core, with the magnetically conductive clamping 9 of the oscillating tongue 10 is connected.

The vibrating reed 10 is arranged so that this approximately ^r in the rest position in the middle of the air; paltes of the pole pieces 7 ^f and 7 "of the soft iron core 7 is located, and the free-swinging end faces the air gap, the vibratory tongue 10 is later closer to one. described way firmly clamped on the clamp 9 and tuned to the resonance frequency of the audio frequency signal voltage superimposed on the network.

The permanent magnet generated in a known manner via a Part of the soft iron core 7 »the assigned pole piece 7 * and the magnetically conductive restraint 9 a premagnetization of the oscillating tongue 10, which causes the oscillating tongue 10 the audio frequency signal voltage follows true to frequency.

2 and 3 show the structural design according to the invention, the excitation coil 2 being pushed ^{onto the lamellar soft iron core 7 with its pole pieces 7 f and 7 ″.}

The soft iron core 7 is connected, for example, by a screw 15 to the magnetically conductive clamp 9 on which the permanent magnet 8 rests, against which the oscillating tongue 10 is clamped via a pressure plate 11 by the pressure screws 13 with the help of the clamping device 12 made of nonferrous magnetic material will. This entire excitation unit is mounted on the common base plate I ¹ *.

Appropriate dimensioning of the parts ensures that the oscillating tongue 10 can oscillate freely approximately in the middle of the air gap between the pole pieces 7 ^f and 7 ″.

Located opposite the freely oscillating end of the oscillating tongue 10 At a short distance there is a ferromagnetic cutting edge 16 of the rotor 17, which has a fixed point bearing 18 and a resilient tip bearing 19 is mounted in the rotor arm 20 so as to be easily rotatable.

The rotor 17 made of non-ferro-magnetic material contains, for example, two permanent magnets 21 and 21 'arranged in such a way that a fixed reed contact 23 can be inserted through the freely recessed center space of the oval rotor opening 22 and cemented into the recesses 2k and 2Ί' of the rotor arm 20, for example using silicone rubber.

The rotary movement of the rotor 17 is ^{limited by the adjusting screws 27, 27 f} , arranged in the rotor arm 20. The adjusting screw 27 ^f serves to limit the rest position of the rotor 17, while the adjusting screw 27 limits the angular position in the direction of rotation.

In addition, the rotor arm 20 has a radial adjustment slot 28 mounted on the center of the rotor, in which it is adjustably mounted on the stable shielding support 30 by means of the screw 29.

The complete rotor arm 20 is within a magnetic shield, consisting of the shielding plate 25, on the stable shielding support 30 mounted in such a way that unwanted magnetic influences of the nearby electromagnetic excitation system, consisting of soft iron core 7 with Excitation coil 2, permanent magnet 8 and the vibrating tongue 10 are shielded.

- 10 -

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By this magnetic shielding in the example shown type, which also as a connected shielding

Ishaltsr 2.us ^e 'si "ü22Z * t sein lc2.nn the switch behavior is significantly improved and the arrangement is insensitive to external magnetic interference fields.

In order to achieve the insensitivity to mains surge voltages mentioned in the description, the amplitude of the vibrating tongue 10 is set by two, on the shielding plate 25, on each side the vibrating tongue 10, coated with strongly damping material, adjustable by bending stops 26, 26 * muffled.

In Fig. 4, the additional electrical measure is one Damping circuit for suppressing the unwanted oscillation of the vibrating tongue 10 when mains surge voltages occur shown.

The mains voltage with the superimposed audio frequency voltage is fed via the terminals 1 to the series resonance circuit formed by the excitation coil 2 and the capacitor 3, the senile Excitation coil 2 sits on one leg of the soft iron core 7 and the vibrating tongue 10 in the air gap between the Pole shoes 7 'and 7 "are arranged to swing freely. J

In parallel to the excitation coil 2, a series circuit, formed from the limiter resistor 4, Zener diode 5 and diode 6, is arranged in order to attenuate the mains surge voltages.

71A013617. p. 73

Claims (2)

9.3.1973 n 68o8-IV / He Telephone 5617 62 G 71 401 36.0 Fr.Sauter AG Protection claims 1. Remote control input circuit for resonance receivers with electromagnetic excitation of a mechanical oscillating tongue, tuned to the resonance frequency, at the freely oscillating end of which a rotatably mounted rotor is coupled in a defined manner by means of a ferromagnetic cutting edge via an air gap, and the rotor is held in its rest position when the oscillating tongue is stationary, characterized in that , daö the * non-ferromagnetic rotor (17) contains a permanent magnet !: (21, 21 ') and has a radial recess (22) in which a fixed reed contact (23) is arranged so that in the rest position the permanent magnet (21, 21 ') generated first magnetic field between the rotor blade (16) and the free end of the oscillating tongue (10) is greater than that between the permanent magnet (21, 21') of the rotor (17) and the reed contact (23) second field, and that when the tongue vibrates, the magnetic modulation results in a change in the magnetic force behavior tnis results in such a way that as a result of the rotation of the rotor, the flow through the ferromagnetic part of the reed contact (23) increases and the contact closes. 2. Remote control input circuit according to claim 1, characterized in that that the rotor is formed by two part rotors arranged on a common shaft and each part rotor contains a permanent magnet ;. 3- remote control input circuit according to claims 1 and 2, characterized characterized in that a magnetic shield (25, 30) »arranged between the assembly unit rotor arm, Rotor, reed contact and the electromagnetic excitation system, the influence of external magnetic interference fields is avoided. ¹ J. Remote control input circuit according to claims 1 to 3, characterized in that fixed stops (26, 26 ') with a strongly damping coating are assigned to the shielding plate (25) on both sides of the freely oscillating end of the oscillating tongue in such a way that undesired impulse disturbances of the oscillating tongue ( 10) experience a limitation of the amplitude.