DE2037106A1 - Device for interconnection for moving contacts of buttons field switches - Google Patents

Description

2037108

59 P 9

Dr. Helmut Späth ^{26 July 197} °

8200 Roscnhoim / Obb. Max-Josefs-Platz 6 Dculxdiland

Nippon Gakki Seizo Kabushiki Kaisha, No. 10-1, Nakazawa-cho Hamamatsu-shi, Shizuoka-ken / Japan

Device for interconnecting movable contacts of keypad switches

Brief description

The invention includes a device for taking place with one another Connection for moving contacts of multi-stage keypad switches in an electronic musical instrument, in which uses a printed circuit board which is able to place the moving contacts as groups to connect the usual individual wiring «The facility simplifies the complicated wiring processes in the Manufacture and also error-prone complicated connections in the moving contacts, which leads to the elimination of crosstalk due to the presence of stray capacitances, caused by unreliable connections.

The invention relates to fasteners for use in a keypad switch arrangement, in particular a connecting device for moving contacts of multi-stage Taetenfeldsehaltern in an electronic musical instrument,

The purpose of the invention is to create a connecting device (Intramural coupler) to create a greatly simplified, but reliable electrical connection of the movable

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Achieve contacts from multi-position keypad switches.

Another purpose of the invention is to provide a connection device for ensuring the operational reliability of the electronic musical instrument as well as the freedom of this instrument from crosstalkers.

Another purpose of the invention is to provide a connecting device which is simple in structure and easy to manufacture at low cost.

The invention is explained in more detail below with reference to the drawings. Show it:

Pig. 1 shows an exemplary embodiment of a connecting device according to the invention for movable contacts of pre-arranged multi-stage Tasienfela switches ₉

2 shows a section along the Linz © II - II from Pig. 1, 3 shows a section along the line III - III "of Pig. 1 /

Fig. 4 shows the connection. according to Fig. 1 .. after attachment on some of the contact members of the movable contacts, protruding from the back string of the keypad switches,

5 shows a section along the line V - .V / von.Fig., 4.,.

Fig. 6 shows the electrical connections. - in ..a keypad switch arrangement according to the state of the art ^

7 shows a connection according to a further exemplary embodiment of the invention in view of y

First, a keypad switch assembly for electronic Musical instruments after the. Stand eier Technlk ^ according to lTJbgc ... 6 explained.

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BATH ORIGINAL

Many known keypad switch arrangements for electronic musical instruments consist of multi-stage switches according to FIG. 6, so that each of a certain number of game keys 101 which are arranged in a row according to the note designations, for example Cg, C g .. .C * .. .C. .. .C, -. ..Cg ₍ can be provided, is provided with several switches, for example three switches 102, 105, 104, which can all be closed or opened simultaneously by pressing a single button. The switches generally designated 103, which in the Intermediate level are included, are used for key control of the corresponding tone signals Cg (65 Hz) ... C, ... 0 .... C ₅ ... Cg- (1047 Hz) of 8-puss register notes (with pitches equal to the The switches, generally designated 102, which are contained in the top level, set the switches for key control of the corresponding tone signals C, (131 Hz) ... C ₄ ... C ₅ .VC ₆ ... C ₇ (2093 Hz) of the 4-foot register notes (notes with pitches one octave higher than the key note names). The switches generally designated 104, which are contained in the lowest level, represent those switches for key control of the corresponding tone signals Cj (33 Hz) ... Cg ... C ₅ ... C ₄ ... C ₅ (523 Hz) from 16-foot register notes (notes with pitches one octave lower than the key note names). Each switch includes a movable contact and a stationary contact. Moving contacts are provided individually and correspond to the relevant switches. On the other hand, the stationary contacts are provided in the form of busbars as well as jointly for each stage. The stationary contacts for each stage are connected at one terminal to a common output line among the three separate output lines I ^, 1 «» 1 · ». These corresponding common output lines are in turn connected to other circuits, for example tone color circuits A ^, Ag or A-. After that, their output connections are jointly connected via volume controls B ₁ , B _{2 and B-;} this common line is connected to an amplifier G and, in sequence, to a loudspeaker S.

On the other hand, the wiring under the moving contact is like that

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arranged that these are connected to one another to generate tone signals of the same pitch, which are contained in different stages of the switch. In connection with this, wiring is provided between the sound source circuits and the terminals of the entepreohenden movable contacts of the 16-foot notes (C ₁ "Ce) contained in the lowest level, and also the terminals of the corresponding movable contacts of the notes of those of the 8-foot registers and 4-foot registers that are not included in the 16-foot register

(i.e. C * V - Q _c in the 8 foot register and (fv - C ₇ in the 4 foot 5 ο ^σ ο isie

5 isie

Register) to generate such sound signals as / the corresponding Correspond to pitch gradients.

In the above-explained structure of the keypad switch according to the prior art, a key, for example corresponding to C1, can be depressed. The switch in the 4-foot register for the C. tone signal, the switch in the 8-foot register for the C tone signal and the switch in the 16-foot register for the C ₂ tone signal are then simultaneously activated closed. As a result, tone signals having pitches corresponding to C., C, and C _{2 are} supplied to the common output lines I ₁ , I ₂ and 1 », respectively. These tone signals are then passed through the corresponding tone color settings and reach the volume controls B, Β «or B-, the input tone signals being selected as a single tone or a composite tone. The output variables of the volume control are then amplified by the amplifier G and emitted from the loudspeaker S as acoustic musical tones.

The connections between the terminals of these movable contacts in an upper stage of a multi-stage panel switch arrangement as well as the terminals of these movable contacts in the adjacent lower stage, both of which are the same Representing pitches have heretofore been established by using lead wires separately for each connection. Accordingly The wiring processes not only caused a great deal of difficulty but often also led to

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Bad connections as a result of the fact that the wiring between a large number of movable contact connections similar to * licher shape in a limited, enclosed space of the Keypad switch assembly were to be accomplished.

To the aforementioned disadvantages of the prior art to avoid is the creation of a connection according to the invention aimed at comprising an insulated base plate with a printed circuit thereon and simultaneous connections between the ports several selected movable contacts in one stage and the connections of the same number of selected movable contacts Allowing to make contacts in the next stage, with the same pitch gradients being displayed.

According to Pig. 4, 5, a switch housing has movable contact arms 2, which are arranged in multiple stages and in such positions as corresponds to the game keys (not shown). Each of these movable contact arms 2 has a connection strip 2a which extends over the rear surface of the switch housing 1 protrudes. The respective protruding terminal strips 2a are arranged so that those which are in the top step, the beeps of the 4-foot hoten correspond that those in the intermediate level correspond to the sound signals of the 8-foot notes and those in the lowest level are sound signals correspond to the 16 foot notes. Below the foremost end each movable contact arm. is in the aforementioned multi-level arrangement a rod with good conductivity is provided. In the present embodiment these conductive rods are designed in the form of busbars. and are supported on opposite side panels of the switch housing to common stationary contact rods 3 for to form each stage. On the other hand, it runs. Actuating part 4 of each play button vertically through the switch housing 1. These operating parts 4 as well as the corresponding movable contact arms 2 are arranged to be in engagement with each other can be brought when a key is pressed, the corresponding movable contact arms 2, which to

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this particular key in relationship stand close di © circuits simultaneously, while conversely wenn.'der Taetennie is terminated and earth pressure, the switch warden opened simultaneously, "It goes aioh that the game buttons side by side in a series of C ₂ (T ^ ,, .. Gy ..Q ^ ,. .C -.... G ^ are arranged, as can be seen in part from FIG.

A base plate 5 according to FIG. 5 represents the connecting device for connecting the connections of a plurality of movable contact arms of two selected groups, ie a group of C, C 2 keys and a group of C, - C ^ keys according to Pig-. 4. This base plate 5 is provided with an insulating material, for example Myler film. The plate 5 has a length slightly greater than the distance between the outermost end strips, fourteen of which are provided. The width of the base plate 5 is slightly larger than the distance between the connecting strips of the top and bottom steps. 5a from the upper longitudinal edge of the base plate 5 on the extreme right side up to form a shoulder there, ΐ · # & Ίιΐ? Θηώ 'a downwardly protruding projection 5b from the lower longitudinal edge.an the extreme left side and a similar one Shoulder forms ₀

In this way, the base plate 5 has a longitudinal part with a reduced width between these two opposing _i front sprays 5a, 5b. A longitudinal slot 5c with. opposite vertical end faces runs through the base plate - 5 - and lies in its central longitudinal area. The vertical end surface line of this elongated slot 5c on the extreme right S-side lies in alignment with the vertically inner end surface line of the shoulder, which is formed by the vertical cut-out of a cable of the base plate, around the right-hand projection 5a left. In a similar way, the end surface line of the elongated slot 5c on the extreme left side is in alignment with the vertically inner end surface. vertical

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cut shoulder of the left protrusion 5b. This

5c
elongated slits are of sufficient length to pass through ten (10) of the terminal strips which are arranged side-by-side in a row in each individual stage. In the right-hand projection 5a of the base plate 5, a slot 6b is formed which has sufficient dimensions to receive a continuous connection strip 2a. This slot 6b has vertically opposite end edges and is located on the extension of the elongated slot 5c such that the lids vertical boundary surface of this slot is at a distance t (illustrated in Fig. 4) from the right vertical end surface of the elongated slot 5c. This distance t represents the interval between the opposite edges of any two terminal strips 2a, 2a which are arranged side by side in a single step. Another slot 6a for the passage of a terminal strip is formed on the same extension as that on which the slot 6b is provided so that the slot 6a is located on the outside of the slot 6b at the same distance t from the right edge of the slot 6b is. In the right-hand projection 5a and exactly one step above that of the slots 6a, 6b, a horizontal row of two identical slots 7a, 7b is provided for the passage of two connecting strips, which are contained in the adjacent upper step relative to that for the slots 6a, 6b. In the same way, a slot 6a.j is provided in the left projection 5b for the passage of a connection strip 2a. This slot 6a- is arranged at the distance t from the left vertical end face of the elongated slot 5c on the extension of the latter, the distance t being the interval between the horizontally arranged two terminal strips in the case of the slot 6a. Another slot Ob ₁ is formed on the outside of the slot 6a1 in the projection 5b at the same distance t from the left end of the slot 6a ... so that it lies on the extension of the elongated slot 5c. One step below the slots 6aj * Ob ₁ two slots Ia ^ ₉ 7b.j are formed for the passage of the horizontally arranged two connecting strips, which are contained in the adjacent lower step.

109808/1

Between the slots 6aj, 7a ^, the slots Ob ₅ , 7b.j as well as the slots? A, Sa ₁ , the carriage 7b ₉ Gb ₁ on the outer surface for the base plate 5 with the above-mentioned structure and wiring provided by applying copper foils of appropriate width and treated by known processes for the production of printed circuits. The opposite connections of the corresponding wirings are each formed in a widened part, which covers the peripheral areas which surround the open edges of each slot. The peripheral areas of the slots 7a, 7b on the right upper step of the base plate are connected to the peripheral areas of the slots 6a ... or 6h * , which are arranged on the intermediate step on the base plate by means of two wirings 8, 9 which run in the longitudinal direction on ien surfaces of the base plate "in" the area above the elongated slot 5c in corresponding spacings opposite one another. The peripheral areas of the slots 6a, 6b ₉ which are arranged at the intermediate step on the right end section of the base plate _{9 also} have a connection to the slots 7a, | _{or 7b ^ on which SInO 5 is} arranged on the lower step of the left part of the base plate in which the wirings 10, 11 are guided so that they are longitudinally on the side below the elongated slot. 5c run. In this way a connection device (intramural coupler) is set up.

This compound is © device attached to the switch assembly by the slits 7a _t 7b and 6a, 6b, which are formed in the right end portion of the base plate 5, are applied to the terminal strips 2a, which in the first and second vertical row of the upper and intermediate horizontal steps are included ₅ as well as by attaching the slots 6a ^ _f 6b- and 7a-, 7b-, which are formed on the left end portion of the base plate 5 , on the connection strips 2a, which are in the thirteenth and fourteenth vertical rows of the intermediate or , lower stage after Pig _o 4 are included. The type of arrangement of the interconnection means' is such that the third to eleventh connector strips, which in the

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upper stage is contained, are allowed to protrude along the upper passage a, that is, along the lengthwise Ausaohnittrandes of the base plate 5, and that the first to twelfth connector tires included in the lower stage, are made to protrude along the lower passage, ie, along the lower longitudinal cut-out edge of the base plate. The third to twelfth terminal strips included in the intermediate stage are also made to protrude through the elongated slot 5c. The connecting device can therefore be arranged close to the rear of the switch housing 1. After attaching this connector to the switch housing 1 in the manner described, the portions of the respective wirings 8, 9, 10, 11 surrounding the slots formed on the opposite end portions of the base plate 5 are soldered to their respective protruding terminal strips 2a. As a result, the two movable contacts (corresponding to the O ₀ and CrI key, which are marked with

U- CC.

C, - and Cr, - tone signals are supplied) of the 4 ~ 3? Uß-Begister, which is contained in the upper level, with the two movable contacts (corresponding to the C, and Cr, keys, which are marked with C--

■ flu JJ. J

and C ^ tone signals) of the 8-puss fi © gister, which is contained in the intermediate stage. Also the first two connection strips (corresponding to the G ₀ and Crü keys, which start with C ^ and (T ^ Tone signals are supplied) of the 8-puss register, which is contained in the intermediate stage, are connected to the two connection strips (corresponding to the dex C ~ and d% keys, which are supplied with Cp and (FTJ tone signals) of the 16 -luß register connected, which is accordingly included in the lower level.

Then, as illustrated by the dash-dotted lines in Fig., Those in the right part are similar to another Connection means formed slots attached to the third and fourth protruding terminal strips, which in of the upper and intermediate tier are included | the Slots of the left end portion of the device are attached to the fifteenth and sixteenth connection strips attached, which

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is included in the lower level and lower level. Thus, those terminal strips which are included in the respective stages and relate to the same pitch signals are electrically connected to each other. By using four similar interconnection devices, as well as by connecting the connection strips in the corresponding stages in succession to those which relate to the same pitch signal © and are contained in corresponding adjacent stages, it is understood that the connection in the manner described between the connecting strips of the movable contacts in corresponding stages and the connecting strips which relate to the same pitch signals and are contained in their corresponding neighboring stages are en Oer movable contacts connected, which in the gister i6-EuS S © & ®κ lowest level are included, such AmsciiltißBtreifesij contained in äem 8 foot register to the ÜJoBsigaal®- Cw * .- Q _r according to the key names GV - CL · with, u aä fen in the 4-foot register, "im-Sie Tonsignal © (Jg - Q" according to the key naii © !! CTv - G _c nitsuteilea «Baraiaf all © connecting strips of the movable Kontakt® ä © r 4-foot, ₉ 8-foot and 16-foot registers can now be supplied with signals which have the corresponding pitches required for this corresponding connection strips are provided.

In the fall, it-at & s multistage switches beispielaweise to Vierstufensehaltei? is _f mlnä in äem right end portion of the base plate dr © i S @ ite by side - arranged slot © ■ in three stages arranged Ueq ü & B this accommodation eifen äurohlaufend ai © g®- 'desired three side by side © »AnschlmBst ^ , which © in jeiei? öer © rst @ n (© beds _{) 9} äev second and third stage contain alias »Ia Sea? gl @ i © li @ B h®BGh.T ± eh®n®n way are arranged in the left egg needle © bsclmitt S © e © slots Ib aset steps these those side © an Seit®. © ag®o3? Teeten continuously included wewmBg®n ₉ which © in öas? mj® ± t®n ^ dsifcten

and fourth stage © are included. Furthermore, elongated slots © are provided in these areas of the base plate corresponding to the positions of the two horizontal rows of connecting strips, which are in the second and third stage. Wirings'-are provided between the respective slots - those in the. ' right portion of the base plate in the ret © © n _f -second and third stage * are at the respective slots, and the corresponding slots in the becshnitt * the linken'End & exerts Hrunäplatte .in'der second, third and fourth stage are arranged by Conductors made of a material such as copper foil can be used. In this way, a group of nine connection strips in any stage can be connected simultaneously to four groups of connection strips of the same number of equal heights _p which are in the corresponding adjacent steps are included * an effect similar to that of the Breistufeneinriehtung can be achieved «

As stated above, the aim of the invention is to provide an improved connection device for movable contacts of multi-stage keypad devices in an electronic musical instrument. According to the invention, there is an L-shaped cutout or passage in the springs of the opposite bottom section of the. Base plate © usgebiliet. Depending on the requirements, an elongated slot or several slots or passages can be formed in this part of the base plate, with a reduced width between the cutouts, which are provided on both longitudinal sides of the base plate. These slots can, however also be omitted. In this way it is possible to affix this connection device positively to the rear surface of the switch housing, to connect the necessary connection strips, which are contained in two adjacent steps, without causing, in general, the unnecessarily protruding connection strips which are in the uppermost Intermediate as well as the lowest level are included, are blocked by the wall of the base plate, since these connecting strips are freely guided through these passages. In addition are in the. left protruding part of the base plate

109808 / 13.9 ^. . -.

Slots or perforations for the passage of several connections ^ strips are formed, which are included in the corresponding steps, excluding the top step. In the right protruding part, however, slots or perforations for the implementation of an equal number of connection strips provided, which are included in the corresponding stages, excluding the lowest stage. Between the slots of the corresponding steps in the right protruding part as well as the In slots of the respective adjacent steps in the left projecting part, printed circuit wirings are provided to connect these two groups respectively. In this way it is possible to use the connection strips to connect a plurality of movable contacts which lie in any desired stage to those connecting strips of an equal number of movable contacts which lie in the adjacent stage and convey the same pitch signals. In this way, the invention not only simplifies and simplifies the wiring process in an essential manner, but also eliminates the risk of faulty connections occurring. Furthermore, the problem of crosstalk in high-frequency zones has hitherto existed as a result of stray capacitances between the connections. According to the invention, there is no such defect, since the corresponding wiring or connections are spaced apart exhibit.

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BATH ORIGINAL

Claims (5)

. 15 _ 2037108 claims 1. Device for interconnecting movable contacts of pre-arranged multi-stage keypad switches, characterized by an electrically isolated elongated base plate (5), at least one, a single level representing horizontal row of spaced Perfo «-. configurations (6a, 6b, 6a _S 6b..) that in each are formed of two longitudinally opposite end portions (5a, 5b) of the elongated base plate (5) such that both rows (6a, 6b;. 6a, 6b. .) have the same number of perforations, the perforations in a row in one end portion of the base plate and representing a given step on the surface of the base plate with the perforations in the row of an adjacent step opposite the given in the other end portion the step located on the base plate, each of the perforations being coated thereon with a conductive material (8-11) and arranged so that one of the movable contacts (2) is able to pass through into engagement, and passages (5c) which at the both side surfaces and / or in the base plate between the two opposing innermost perforations (6b, 6a ^) are formed on the opposite two end portions de r base plate (5) are included in order to pass through those movable contacts (2) which are not connected to one another and which are arranged between the two opposing innermost perforations. . 2. Device according to claim 1, characterized in that the Distance between one of the perforations (6a) in a row a given step, which is in an end portion (5a) of the base plate (5) and one of the perforations in the row in the adjacent step which is in the other end section (5b) the base plate (5) is located, represents an octave. 3. Device according to one of claims 1, 2, characterized in that that the electrical connection between the perforations (6a, 6b, öa ^, 6b.) in the series is any given 109808/13 90 BATH ORIGINAL -H- Stage which is located in an end section (5a) of the base plate (5) is, and those in the row of an adjacent step, which in the other end portion (5b) of the base plate (5) is located, is brought about by means of a conductor (O -IT), 'which is printed on the surface of the base plate. 4. Device according to one of claims 1-3, characterized in that the longitudinal slot (5c) is in alignment with _{r of} the series of perforations (6a, 6b) of a given step in an end portion (5a) of the base plate (5 ), as well as with the row of perforations (6a ^ ₁ , Ob _{1 of} an adjacent step, which is located in the other end section. (5b) of the base plate (5). 5. Device according to one of claims _{1-4 S,} characterized in that the electrically insulated plate consists of Myler-Pilm. - 109808/1390 """ ORIGINAL