JPH0580085U - Small electronic device body with sounding mechanism - Google Patents

Abstract

(57) [Summary] [Purpose] The objective is to prevent unpleasant chattering and abnormal sounds from the aircraft even when the volume of the sounding mechanism is increased. [Structure] In a small electronic device including an upper case 11 and a lower case 12 in which a sounding mechanism such as a keyboard K and a speaker 14 is arranged, widths are provided at four corners of the upper and lower cases 11 and 12. Notch recesses 19a, 19 of about a quarter circumference
b is formed in each of the cutout recesses 19a and 19b, the outer wall part 20a is made of a soft elastic material and has an arc shape corresponding to the shape of the cutout recess, and the inner wall part 20b lower than the outer wall part 20a and an intermediate part between them are formed. Insert 2 formed of short connecting pieces 20c
0 is tightly sandwiched and mounted, and the upper and lower cases 11 and 12 are integrally coupled by abutting the interlocking protrusions 17a and 17b.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of a body of a small electronic device having a sounding mechanism inside.

[0002]

[Prior Art]

 A small electronic device having a sounding mechanism inside, for example, an electronic keyboard musical instrument is shown in FIG. 3, and the body is formed of a horizontally elongated plate-shaped upper case 1 and a lower case 2 in a horizontally long flat shape. On the front side of the upper case 1, a keyboard K of a required musical scale is mounted, and on the rear side thereof, various switch members 5a and a volume member 5b for controlling tone color, volume and the like are attached, and further side parts are attached. On the back side, there is provided a sound emitting lattice section 6 for mounting a cone type speaker 4, and on the back side, a sound source circuit or a plurality of tone color circuits in which electronic parts 3a such as resistors and capacitors are mounted on an integrated circuit, Alternatively, some printed circuit boards 3 having an amplifier and a power supply circuit are arranged, and a battery box (not shown) for supplying power is arranged in the lower case 2.

Then, connecting protrusions 7a and 7b are provided at the four corners of the upper case 1 and the lower case 2 and in the central portion in the longitudinal direction, respectively, and the connecting protrusions 7a and 7b are abutted to each other. Cover the lower case 2 with the upper case 1 and screw the screws 8 into the connecting protrusions 7a and 7b from the lower side as shown in FIG. 4 to assemble the upper and lower cases 1 and 2 together. A tone signal output through each circuit by a key depression operation is amplified by an amplifier and sent to the speaker 4, and a desired tone is emitted from the lattice portion 6.

[0004]

[Problems to be solved by the device]

 By the way, in the above-mentioned conventional electronic keyboard instrument, since the upper and lower cases are simply assembled by associating the connecting protrusions provided at the corners and the central part with screws, the upper and lower case made of plastic can be joined together. , If the loudspeaker volume is increased during use because the parts that are not connected with screws are incomplete, not only the end faces of the upper and lower cases will hit each other but chatter will occur, but also the printed circuit board itself and the board There is a problem that the electronic parts of the machine vibrate and make an offensive sound.

Therefore, an object of the present invention is to prevent an unpleasant chattering sound or abnormal sound from being generated from the machine body even if the output of the sounding mechanism is increased.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention, as a body of a small electronic device having a sounding mechanism inside, forms cutout recesses of required width and depth in at least four corners of a bisected case, Each cutout is divided into two parts by tightly sandwiching the inserts made of a soft elastic material and consisting of an outer wall part and an inner wall part that match the shape of the cutout recess and a short connecting piece between them. The feature is that the case is connected together.

[0007]

【Example】

 1 and 2 show an embodiment of the present invention, in which a fuselage F is formed of a plastic dish-shaped upper case 11 and a lower case 12 in a horizontally long flat shape. The keyboard K is attached, and various switch members 15a and volume members 15b for controlling tone color, volume, etc. are attached to the rear side of the keyboard K, and the cone type speaker 14 is attached to the rear side on the side. A plurality of printed circuit boards provided with a sound source circuit or a plurality of tone color circuits, or an amplifier, a power supply circuit, etc., on the back surface of which an electronic part 13a such as a resistor or a cosdenser is attached to an integrated circuit. 13 (only one is shown in the figure) is arranged, and a battery box (not shown) for supplying power is arranged in the lower case 12.

[0008] The upper case 11 and the lower case 12 are provided with connecting protrusions 17a, 17b at the four corners and the longitudinal center in the longitudinal direction, respectively, each having a height substantially equal to the inner height of the peripheral wall. Further, notch recesses 19a and 19b each having a required depth over approximately one-quarter circumference are formed at four corners of the upper and lower cases 11 and 12, respectively. The following inserts 20 are attached to the recesses 19a and 19b, and the upper and lower cases 11 and 12 are assembled.

The insert 20 is made of an elastic material such as soft rubber or synthetic resin, and has an arc shape that substantially matches the shape of the corners of the upper and lower cases 11 and 12, and straddles the peripheral walls of the upper and lower cases. It is formed by an outer wall portion 20a, an inner wall portion 20b having a height lower than that, and a short flat connecting piece 20c which tightly intervenes between the notch recesses 19a and 19b of the upper and lower cases by connecting both wall portions. ing.

In connecting the upper and lower cases 11 and 12, first, at each corner of the upper case 11, insert the insert body 20 in the upper and lower half wall portions 20a and 20b of the upper case as shown by dotted lines in FIG. Attach the recesses 19a so that they are tightly sandwiched, and then connect the connecting protrusions 17a at the corners and the center of the upper case 11 to the corresponding connecting protrusions 17b of the lower case 12, respectively. Meanwhile, the notch recesses 19b at the corners of the lower case 12 are tightly sandwiched between the inner and outer wall portions 20a, 20b of the lower half of each insert 20 as shown in FIG. The upper case 11 is fitted over the upper case, and the upper and lower cases 11 and 12 are integrally coupled by screwing the screws 18 from below into the connecting protrusions 17a and 17b to be aligned.

Thus, when in use, the musical tone signal output through each circuit is amplified by the key depression operation, enters the speaker 14, and is emitted as a desired musical tone. In that case, the four cases of the upper and lower cases 11, 12 are used. An insert 20 made of a soft elastic material is attached to the corners of the case with the inner and outer walls 20a and 20b tightly sandwiching the peripheral wall of the case corner, that is, the upper and lower cases are four sides. Since it is tightly and elastically supported by the insert body 20, the vibrations of the upper and lower cases 11 and 12 are elastically inserted even if the vibration of the speaker 14 itself due to the sounding operation is transmitted to the upper and lower cases 11 and 12. It will be suppressed by the body 20 and fully damped.

In the illustrated example, the insert 20 is provided in the upper and lower cases 11 and 12 corners, but it may be provided in the central part in the longitudinal direction. In this case, the insertion body 20 has a linear shape, and in the above example, the electronic keyboard musical instrument has been described. However, the present invention is not limited to this, and a tape recorder or a radio in which the body is composed of two parts and has a sounding mechanism inside. Etc. can also be applied.

[0013]

[Effect of the device]

 As described above, according to the present invention, as a body of a small electronic device including a divided case and having a sounding mechanism inside, notch recesses are provided at at least four corners of the opposite case, and the notch recesses are provided. The inserts, which are made of soft elastic material and are composed of inner and outer walls and connecting pieces, are tightly sandwiched between the two parts, and the two cases are joined together, so that each case is firmly elastic from at least four sides. Even if the vibration of the sounding mechanism is transmitted to the case, the vibration can be suppressed and appropriately attenuated, and even if the volume of the speaker is increased, the end faces of the case can be separated from each other. No unpleasant chattering noise due to collisions or abnormal noise due to vibration of printed circuit boards or electronic components. Moreover, the elastic insert is firmly attached, and it can be used as a non-slip handle without inadvertently coming off, and can also serve as a pad material for cushioning external shocks. it can.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an electronic keyboard instrument to which the present invention is applied.

FIG. 2 is a cross-sectional view of an end portion of the machine body showing a state in which the two cases are joined and the insert body is attached.

FIG. 3 is an exploded perspective view of a conventional electronic keyboard instrument.

FIG. 4 is a cross-sectional view of one end when the conventional upper and lower cases are joined together.

[Explanation of symbols]

 11 Upper Case 12 Lower Case 13 Printed Circuit Board 14 Speaker 15a Switch Member 16 Lattice Part 17a Connecting Mouth 17b Connecting Mouth 19a Notch Recess 19b Notch Recess 20 Insert 20a Outer Wall 20b Inner Wall K Keyboard

Claims (1)

[Scope of utility model registration request] 1. A small electronic device comprising a bisected case and having a sounding mechanism inside, wherein at least four corners of the bisected case are each formed with a notch recess having a required width and depth, and the facing recesses are opposed to each other. At the notch recess, the inserts made of a soft elastic material, which are almost the same as the shape of the notch recess and which consist of the outer wall and the inner wall and the short connecting piece between them, are tightly sandwiched and mounted in two parts. A body of a small electronic device having a sounding mechanism, characterized in that a case is integrally connected.