JPH0576190U - Speaker support mechanism for small electronic devices - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to suppress excessive vibration from the sound output part of the speaker and prevent it from being transmitted to other parts of the case. [Structure] A window hole 11b is provided in a side portion of the upper case 11, and a thin wall portion 11c having a constant width is provided on an inner surface of a portion around the window hole 11b to vertically extend an upper enclosure wall 15a having a required height. Then, a lower enclosure wall 15b is erected on the bottom wall of the lower case 12 so as to be opposed to this, and the end portions of the upper and lower enclosure walls 15a and 15b are abutted to form a sealed box portion 15, and the lower enclosure wall is formed. A cylindrical support member 15d is provided at the inner center of 15b,
A portion 15c surrounded by the support member 15d and the lower wall 15b of the bottom wall of the lower case is thinly formed, and a cone-shaped speaker 14 is housed in the box portion 15. The speaker 14 is surrounded by the window hole 11b. It is clamped from above and below by the edge and the support member 15d.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a speaker support mechanism that suppresses chattering that occurs from a sounding section in a small electronic device having a speaker.

[0002]

[Prior Art]

 A small electronic device having a speaker, for example, an electronic keyboard musical instrument is shown in FIG. 4 (the upper and lower cases are opened so that the inside can be seen), and the case C, which has a built-in sound producing mechanism, is called the upper case 1. It is formed in a horizontally long flat shape with the lower case 2, a battery box B for power supply is formed integrally with the case 2 at the rear of the lower case 2, and a keyboard K for the required musical scale is arranged at the front. The upper case 1 has a horizontally long opening 1a for exposing and storing the keyboard K in the front half thereof, and cone-shaped speakers 4 are arranged on both sides of the rear surface of the rear half, and an integrated circuit and a resistor are provided in the center. A printed circuit board 3 provided with a sound source circuit composed of electronic parts such as a container and a condenser, a plurality of tone color circuits, an amplifier and a power supply circuit, and various switches for controlling tone color, volume, etc. on the surface of the second half. ， Volume member When the keyboard K is pressed, the signal from the sound source oscillator is converted into a tone color signal through the selected tone color circuit on the printed circuit board 3, amplified by an amplifier, and emitted from the speaker 4. Has been done.

[0003]

[Problems to be solved by the device]

 By the way, in the above-mentioned conventional electronic keyboard instrument, the speaker 4 is arranged in a naked state in a side space inside the box consisting of the upper case 1 and the lower case 2, and the outer edge of the speaker frame 4a is arranged as shown in FIG. Is simply screwed to the inner peripheral surface of the sound emitting lattice portion 1b provided on the side portion of the upper case 1, so that the back side of the cone paper of the speaker 4 (lower case side) during use. A part of the air vibrations generated on the bottom wall is reflected on or transmitted to the bottom wall, which vibrates the lower case and causes chatter at the joint with the upper case. The electronic parts on the board are vibrated here, and similarly, an unpleasant chattering noise is generated, which makes it hard to hear. Such a phenomenon was particularly remarkable when a loud sound was emitted from a speaker in a small portable electronic musical instrument or electronic musical instrument toy. Therefore, the purpose of this invention is to suppress and dampen extra vibrations in the sounding part so that they will not be transmitted to other parts of the case.

[0004]

[Means for Solving the Problems]

 Based on the above-mentioned object, the present invention is a small electronic device including an upper case and a lower case and having a cone type speaker on the side, and a window for speaker attachment is provided on the side of the upper case. The inner wall of the surrounding part is provided with a thin part with a constant width so that the upper enclosure wall of the required height faces downwards, while the bottom wall of the lower case faces the upper enclosure wall and the end face against it. An enclosure wall is provided, and the upper and lower enclosure walls form a sealed box in the case, and a tubular support member of the required height is provided inside the lower enclosure wall and is surrounded by the support member and the lower enclosure wall. The bottom wall portion of the lower case is formed thin, the speaker is housed in the box portion, and the speaker is sandwiched between the peripheral edge of the window hole and the support member.

[0005]

【Example】

 1 to 3 show an example in which the present invention is applied to an electronic keyboard musical instrument, and a case C, which is a body, is an upper case 11 which is made of synthetic resin and which is horizontally long and has a lower front half portion which is stepped downward and is stepped. Like the above, it is formed horizontally flat with the dish-shaped lower case 12, a battery box for power supply is formed integrally with the case behind the lower case 12, and a keyboard K for the required scale is arranged in the front. The upper half of the upper case 11 is provided with a stepped front half and has a horizontally long opening 11a for exposing and accommodating the keyboard K, and has a frame shape. A power hole 11b (a square shape in the figure) having a square shape is provided, and various switch members 13a and a volume member 13b for controlling timbre, volume, etc. are attached to the central surface, and the rear surface of the upper case 11 is provided. With integrated circuits Anti vessels and tone generator consisting of electronic components such as capacitors, a plurality of sound colors circuit, (not shown) printed circuit board with an amplifier and a power supply circuit or the like is arranged as described above.

As shown in FIGS. 2 and 3 (only one side is shown for convenience), the inner surface of the portion around the window hole 11b on both sides of the rear half of the upper case 11 is outside the peripheral edge of the window hole 11b. The window hole 11b is surrounded by a portion 11c having a constant width, which is thinned to about half the thickness of the wall of the upper case, and has a shape similar to that of the peripheral wall of the latter half of the upper case. An upper enclosure wall 15a having a height substantially equal to that of the upper enclosure wall 15a is provided so as to project downward, and is opposed to the upper enclosure wall 15a on both sides of the rear half of the lower case 12 so that the height is substantially the same as the height of the peripheral wall. The lower enclosure wall 15b is provided so as to project upward from the bottom wall of the case. When the upper and lower cases 11 and 12 are joined to each other, the end surfaces of the enclosure walls 15a and 15b are abutted against each other to form the window hole 11b. Closed on both sides inside Case C except for Are formed to form a box portion 15, and the opposite end surfaces thereof are inclined to ensure a sealing effect.

A cylindrical speaker support member 15d of a required height is provided in the center of the inside of the lower enclosure wall 15b, and the lower enclosure of the support member 15d and the bottom wall of the lower case 12 is provided. The portion 15c surrounded by the wall 15b is formed to be thin to about half the thickness of the other wall portion, like the portion 11c having a constant width around the window hole 11b of the upper case.

As shown in FIG. 3, the window holes 11b on both sides of the upper case 11 have a plurality of thin holes parallel to the longitudinal direction of the case inside the peripheral frame 16a having the same shape as the window hole 11b and slightly larger than the window hole 11b. The lattice members 16 provided with the rods 16b at regular intervals are snap-fitted into the window holes 11b at the portions of the narrow rods 16b and the portions of the peripheral frame 16a are closely attached to the lower surface of the peripheral edge of the window holes 11b. And the outer edge of the speaker frame 14a is attached to the lower surface of the peripheral frame 16a of each lattice member 16 by a connecting member 17 such as a double-sided tape (in the case of a screw, packing is interposed) to form a cone shape. The speaker 14 of each of the above is vertically installed, and in this state, the connecting protrusions 18a and 18b provided at the corners and the center of the upper and lower cases 11 and 12, the upper enclosure wall 15a and the lower enclosure wall 15b are attached. The upper case 11 is covered with the lower case 12 so as to abut each other, and screws 19 are screwed into the connecting protrusions 18a and 18b from the lower side so that the upper and lower cases are integrally connected as shown in FIG.

At that time, as shown in FIG. 2, the upper end surface of the cylindrical support member 15 d provided in the lower enclosure wall 15 b comes into pressure contact with the lower surface of the holding plate 14 d of the magnet 14 c of the speaker 14, and thus the speaker 14 Is supported from above and below and is stable, and the speaker 14 is housed in a closed space inside a box portion 15 formed by an upper enclosure wall 15a and a lower enclosure wall 15b, and the speaker 14 also serves as a buffer spring. It is flexibly supported by the upper and lower cases 11 and 12 through a thin portion 11c having a constant width around the hole, a portion 15c of the bottom wall in the lower enclosure wall 15b which is also thin, and a cylindrical support member 15d.

Therefore, when in use, a key operation causes a signal to enter the coil of the speaker 14 through the tone color circuit on the printed circuit board, vibrate the cone paper 14b to generate a musical sound, and the musical sound is forwarded through the lattice member 16. Is emitted by.

In this case, since the speaker 14 is housed in the closed box portion 15, air vibration generated on the back side of the cone paper 14b due to the vibration of the cone paper 14b is caused in the upper and lower enclosure walls 15a and 15b forming the box portion 15. The speaker 14 is supported by the upper case 11 and the lower case 12 through the thin portions 11c, 15c, and 15d without being cut off and going into the case, and thus is generated by the vibration of the cone paper 14b. The vibration of the speaker 14 itself is also attenuated by the thin parts 11c, 15c, 15d of the upper and lower cases that flexibly support it, and is not transmitted to the other parts of the case, so that the switch member and electronic parts do not vibrate.

In the above example, the speaker 14 is provided on both sides of the case so that the stereo effect can be obtained, but this may be provided on only one side, or in the above example, the electronic keyboard instrument. However, the present invention can also be applied to other small electronic devices such as tape recorders having a built-in speaker.

[0013]

[Effect of the device]

 As described above, according to the present invention, since the speaker supporting mechanism of the small electronic device having the upper case and the lower case and the cone type speaker arranged on the side is configured as described above, the back side of the speaker cone paper is used. The air-tight vibration that occurs in the case can be reliably blocked by the sealed box part to prevent it from entering the case. In addition, the vibration of the speaker itself due to the vibration of the cone paper also depends on the peripheral edge of the window hole and the support member. It is suppressed by stable support from the top and bottom and is attenuated by the flexible support of the thin parts of the upper and lower cases so that it does not reach other parts. Can be prevented. The closed box part is made by joining the enclosure walls integrally formed in the upper and lower cases, does not require a special box body, and does not require screws for mounting the speaker.

[Brief description of drawings]

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

FIG. 2 is a sectional view taken along line XX in FIG.

FIG. 3 is a perspective view showing the upper case and the lower case separated from each other on one side.

FIG. 4 is a perspective view of a conventional electronic keyboard instrument with upper and lower cases opened.

5 is a cross-sectional view taken along the line YY of FIG.

[Explanation of symbols]

 11 Upper Case 11b Window Hole 12 Lower Case 13 Switch Member 14 Speaker 14a Speaker Frame 15 Box 15a Upper Enclosure Wall 15b Lower Enclosure Wall 16 Lattice Member C Case K Keyboard

Claims (1)

[Scope of utility model registration request] 1. In a small electronic device comprising an upper case and a lower case and having a cone-shaped speaker on a side portion, a window hole for mounting a speaker is provided on a side portion of the upper case, and an inner surface of a portion around the window hole. The bottom wall of the lower case is provided with a lower enclosure wall facing the upper enclosure wall and the end faces facing each other. The enclosure wall forms a closed box in the case, and a cylindrical support member of a required height is provided inside the lower enclosure wall and the bottom wall of the lower case surrounded by the support member and the lower enclosure wall. Is thinly formed, the speaker is housed in the box portion, and the speaker is sandwiched between the peripheral edge of the window hole and a supporting member. A speaker supporting mechanism in a small electronic device.