JPS5855786Y2 - Electronic musical instrument operation unit - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an operation unit for an electronic musical instrument that makes wiring easier by effectively using the space on the back side of a roll panel on a controller.

Conventional electronic musical instruments, especially electronic organs, have a control panel with a large number of electrical components such as switches and volumes, and the wiring on the back of this panel is very complicated, so many lead wires are intersected and held together. was extremely troublesome.

This idea was made in consideration of the above points, and its purpose is to facilitate the wiring of the circuits of the electrical components attached to the control panel, and at the same time, to easily hold a large number of lead wires in an electronic musical instrument. The purpose is to provide an operating unit for

In order to achieve this purpose, this invention consists of a control panel for an electronic musical instrument, a printed circuit board attached to the back of the control panel in parallel with the control panel, a printed circuit board connected to the printed circuit board and bent backwards, and a printed circuit board that is bent backwards. In an operating unit for an electronic musical instrument, the electronic musical instrument has a holding member that holds a bent printed circuit board to the printed circuit board mounted substantially parallel to the printed circuit board. A wire and a member for connecting the lead wire to the east are arranged.

This invention will be explained in detail below based on the drawings.

FIG. 1 is a front perspective view of an embodiment of an electronic musical instrument operating unit according to the present invention.

Reference numeral 1 denotes a chassis made of a metal plate and formed long in the horizontal direction so as to be attached along the back surface of the control panel of the electronic musical instrument.

A plurality of mounting holes 2 for mounting electrical components are formed in the chassis 1, and grooves 5 and 6 are formed in the center of the upper and lower edges 3 and 4 of the mounting holes 2, respectively.

The upper and lower ends of the chassis 1 are bent rearward at right angles, and arm portions 7 and 8 are formed at predetermined intervals, and furthermore, hook portions 9 and 10 having locking slopes are formed at the tips of the arm portions 7 and 8, respectively. ing.

Furthermore, L metal fittings 11 and 12 for attaching the chassis 1 to the back surface of the control panel are provided on the arms 7 and 8 so as to project forward.

13 is the tone volume as an electric component, and the mounting hole 2
The front part 14 has a larger area, the insertion part 15 has a slightly smaller area than the mounting hole 2, the operating lever 16 for changing the resistance value, and the insertion part 15 are integrally molded to have elasticity and the tip is always fixed. It is composed of locking pieces 17 and 18 that are formed to be inclined outward from the upper and lower surfaces of the insertion portion 15, and a terminal 19.

20 is a printed circuit board provided along the longitudinal direction of the chassis 1, and the upper and lower ends of the mounting surface 20a are bent surfaces 20b, 2.
0C, and the tips of the bent surfaces 20b and 20C are opposed to form a triangular cylinder shape that is almost U-shaped as a whole.

A holding member 21 is attached to a side end of the printed circuit board 20 for holding the bending positions of the bending surfaces 20b and 20C with respect to the mounting surface 20a.

A holding hole 22 that opens rearward is formed in the holding member 21.
A lead wire bundle 23, which is a bundle of a large number of leads connected to each circuit section of the printed circuit board 20, is held in the holding hole 22.

Furthermore, the mounting surface 20a has engagement holes 25° 26 that engage with the hooks 9 and 10 of the chassis 1, and a tone volume 13.
A terminal hole 27 into which the terminal 19 is inserted is formed.

A large number of holes 28 and 29 are formed along the folds of the mounting surface 20a and the bent surfaces 20b and 20C, respectively.

In such a configuration, first, in order to assemble the chassis 1 and the printed circuit board 20, the hook parts 9 and 10 are inserted into the engagement holes 25 and 20.
26 and move it slightly to the right, the mounting surface 20a is clamped and fixed to the locking slope of the hook portion 9.10.

Next, to attach the tone volume 13 to the chassis 1, insert the insertion part 15 into the mounting hole 2, and the locking piece 17.18
slides on the edges 3 and 4 and bends inward, and when the front part 14 hits the surface of the chassis 1 when it is inserted deeper,
Since the locking pieces 17 and 18 have been moved to the back side of the edges 3 and 4, their elasticity causes them to return to their normal positions.

In this state, the tip of the locking piece 17.18 is located on the back side of the edge 3.4, so the edges 3, 4 are sandwiched between this tip and the upper and lower surfaces of the front surface 14, and the tone volume 1
3 is attached to the chassis 1.

When removing tone volume 13 from chassis 1,
Insert a jig such as a screwdriver into the grooves 5 and 6 from the front and push the tips of the locking pieces 17.18 inward to remove them from the edge 3.4 and pull them out forward.

A printed circuit is formed on the back surface of the mounting plate 20a, and predetermined conductor terminals are formed around the terminal holes 27, respectively.

When the tone volume 13 is attached to the chassis 1, the terminal 19 of the tone volume 13 is connected to the terminal hole 27 at the same time.
inserted into.

Later, the conductor terminal and this terminal 19 are joined with solder.

If a conductor is formed in the terminal hole 27 like a through hole, electrical connection can be made simply by inserting the terminal 19.

Since the mounting holes 2 of the chassis 1 are precisely formed using a press die, the electrical components are arranged with the same vertical and horizontal pitches.

After installing predetermined electrical components into each of the mounting holes 2, the chassis 1 is mounted on the back surface of the control panel using L fittings 11 and 12.

Figure 2 shows the mounting surface 20a and the bent surface 2 of the printed circuit board 20.
FIG. 3 is a partial side sectional view before bending when connecting circuits 0b and 20C, and FIG. 3 is a partial side sectional view after bending.

A lead wire 30 is placed above the hole 28 (29), and one end of the lead wire 30 is connected to a conductor 31 formed on the surface of the mounting surface 20a, and the other end is connected to a conductor 31 formed on the surface of the bent surface 20b (20C). Each conductor 32 is soldered.

Note that 33 is a cut groove that becomes a crease on the drawing board.

In this state, the bending surface 20b (
20C), the lead wire 30 will pass through the hole 28 (29)
Because it goes in, there is no need to poke it.

Further, there is no need to loosen the lead wire 30 before wiring, which improves work efficiency and prevents accidents such as short circuits due to contact with adjacent lead wires.

It should be noted that if the holes 28 and 29 are partially or entirely formed in an elongated oval shape in a direction perpendicular to the cut groove 33, there will be more room for the lead wire 30 to enter, which is effective when the wire is thick or a plurality of wires are provided.

Although not shown, terminal holes are also formed on the bent surfaces 20b and 20C, and furthermore, a printed circuit is formed on the back surface, and electronic components such as resistors, capacitors, diodes, transistors, and integrated circuit elements are mounted. Ru.

Lead wires are soldered to each terminal portion of the printed circuit on the back side of the mounting surface 20a and the bent surfaces 20b and 20C for connection to a separately provided electronic circuit device.

Therefore, the mounting surface 20a and the bending surfaces 20b, 20
A large number of lead wires are arranged in the rectangular tube space surrounded by C.

These lead wires are bundled and held in a holding hole 22 formed in a holding member 21.

Therefore, no matter how many lead wires are wired, they can be easily arranged without crossing each other.

FIG. 4 is a front view of another embodiment of the holding member, FIG. 5 is a front view of an east line member to be attached to this holding member, and FIG. 6 is a sectional view taken along line AA in FIG. 5.

In the figure, the holding member 41 is formed in a triangular U-shape,
It has a holding hole 42 that enters deeply from the rear (left side in the figure), and three mounting holes 43 a and 4 are provided around this holding hole 42 .
3 b , 43 C are formed.

Furthermore, two engaging pieces 44a are provided at the front edge of the holding member 41.
, 44b, and two engaging pieces 45a, 45b and 46a are provided on the upper and lower edges, respectively.
, 46b are provided.

On the other hand, the east line member 51 is made of an elastic plastic material and has a U-shape.
Attachment protrusions 52a, 52b, and 52C are provided at positions corresponding to a, 43b, and 43C, respectively.

The inner edge of the east line member 51 has a mounting edge 5 with a slightly U-shaped cross section.
3 is provided, and an east line holding section 5 is further formed in the center.
4 has a wire bundle locking piece 55a at the opening.

55b is provided.

Since the wire bundle locking pieces 55 a and 55 b have elasticity, when the lead wire bundle is pushed in from the direction of the arrow, they can bend and hold the lead wire bundle in the east wire holding portion 54 .

To attach the east line member 51 to the holding member 41, the attachment protrusions 52a, 52b, and 52C are inserted into the attachment holes 43a, 43b, and 43c, respectively, and then fitted.

At the same time, the mounting edge 53 pinches the peripheral edge of the holding hole 42, and the east line member 51 is firmly attached to the holding member 41.

Note that elongated engagement holes are formed in advance on the side ends of the mounting surface and the bent surface of the printed circuit board, so the engagement pieces 44 a , 44 b and 45 a , 45 are inserted into these engagement holes.
b.

46a and 46b respectively, and hold the holding member 41.
Attach to the printed circuit board.

If the holding member is to be more firmly fixed, the engaging piece is caulked.

In addition, in this case, the engaging pieces 45 a, 45 b, 46 a, 4
If you make it into a double-ear shape like 6b, even if one breaks by caulking, you can fix it with the other.

In the above embodiment, the east line member is used separately and the east line locking piece is provided thereon, but the east line locking piece can also be provided directly on the holding member.

Further, in the above embodiment, the holding member and the east line member are integrally combined to serve both functions as a whole, but it goes without saying that they may be provided separately.

Furthermore, it is also possible to directly hold the printed circuit board on the back side of the control panel without using the chassis.

As described above, according to the operating unit of an electronic musical instrument according to this invention, a printed circuit board is arranged three-dimensionally on the back side of the control panel, and a large number of lead wires are arranged in an orderly manner in the rectangular tube space formed by this printed circuit board. This has the effect of effectively using space and reducing accidents caused by wiring.

[Brief explanation of drawings]

FIG. 1 is a perspective view of one embodiment of the operating unit of an electronic musical instrument according to this invention, FIGS. 2 and 3 are partial side sectional views of the printed circuit board, and FIG. 4 is a front view of another embodiment of the holding member. figure,
Figure 5 is a front view of the east line member attached to this holding member.
FIG. 6 is a sectional view along line AA in FIG. 5. 1...Chassis, 2...Mounting hole, 9,
10... Hook part, 13... Tone volume, 19... Terminal, 20... Printed circuit board, 20 a... Mounting surface, 20 b, 2
0 c...Bending surface, 21...Holding member, 22...Holding hole, 23...Lead wire bundle, 27...Terminal hole .

Claims (2)

[Scope of utility model registration request] (1) A control panel of an electronic musical instrument, a printed circuit board attached to the back side of the control panel approximately parallel to it, a printed circuit board that is connected to this printed circuit board and bent backwards, and a printed circuit board that is connected to the bent printed circuit board as described above. In an electronic musical instrument operation unit that has a holding member that holds printed circuit boards mounted in parallel, these printed circuit boards form a rectangular tube space, and a lead wire and a lead wire are connected to the east in this rectangular tube space. An operating unit for an electronic musical instrument, characterized in that an east line member is arranged. (2) The operating unit for an electronic musical instrument according to claim 1, wherein the holding member also serves as the east line member.