JP4337052B2 - Housing structure of audio equipment - Google Patents

Description

  The present invention relates to a housing structure of an audio device suitable for use in a small electronic keyboard instrument.

  In general, in small electronic keyboard instruments, the upper and lower casing parts that make up the casing are formed separately by synthetic resin, etc., and the entire casing is completed by abutting the peripheral edges of both There are many (patent document 1). A keyboard, various control circuits, a tone generator, an amplifier, a speaker, and the like are incorporated in this casing.

JP-A-7-28466

  However, according to the above configuration, if the upper and lower housing parts are not firmly fixed at the peripheral portions, the chatter noise is generated at the contact portions of the upper and lower housing parts due to vibration when the speaker is uttered. The problem that occurs occurs. In order to prevent this, the upper and lower housing parts are formed with high accuracy and both parts are firmly fixed at the peripheral part, or a cushioning material such as rubber is inserted in the peripheral part. Although measures can be considered, there is a problem that all lead to cost increase. For this reason, it has been found that the upper and lower housing parts should be firmly fixed with screws or the like at several points other than the peripheral part, and that a sufficient gap should be provided between the upper and lower parts at the peripheral part. “Sufficiently spaced gaps” are gaps that are not in contact with each other when the speaker is vibrated. Here, in order to prevent dust and the like from entering through this gap and to improve the appearance of the electronic musical instrument, the upper casing part is formed slightly larger than the lower casing part, and the upper casing part has a gap. It is preferable to configure the casing so as to cover the lower casing parts with a gap therebetween.

  However, even if the casing of the electronic musical instrument is configured as described above, metal (or other conductor) foreign matters such as clips, staples, broken pencil cores, and coins are upward from the bottom. If it jumps, the possibility of entering the casing through the gap and short-circuiting the circuit inside the electronic musical instrument may be considered. The present invention has been made in view of the above-described circumstances, and has a housing structure for an acoustic device that can prevent such foreign matter from being mixed and prevent malfunction of an acoustic device such as an electronic musical instrument even if foreign matter is mixed. It is intended to provide.

In order to solve the above problems, the present invention is characterized by having the following configuration. The parentheses are examples.
In the housing structure of an acoustic apparatus according to claim 1, mounted lower housing (200), an upper housing covering to the lower housing (200) (100), to the upper housing (100) In a housing structure of an audio device having a circuit board (180) to be fixed, a fixing member that fixes the upper housing (100) and the lower housing (200) to each other at a portion other than the peripheral portion (126, 212) and a lower surface of the upper casing (100) projecting downward, and fixing the circuit board (180), the upper surface of the circuit board (180) together with the upper casing (100). An enclosing substrate stand (150), an upper side wall portion (120, 110a, 124) that forms a U-shaped groove (122) that projects downward from the peripheral edge of the upper housing (100) and opens downward; Peripheral part of the lower casing (200) Projecting towards the Luo upwardly, and having a lower side wall portion (210) which is inserted in a non-contact state to the U-shaped groove.
Further, in the housing structure of an acoustic apparatus according to claim 2, the lower housing (200), an upper housing covering to the lower housing (200) (100), said upper housing (100) In the housing structure of an audio device having a circuit board (180) mounted on the U-shaped groove (122) that protrudes downward from the peripheral edge of the upper housing (100) and opens downward. It has an upper side wall part (120, 110a, 124) and a lower side wall part (210) that protrudes upward from the peripheral edge part of the lower housing (200) and is inserted into the U-shaped groove in a non-contact state. It is characterized by that.
Further, in the housing structure of an acoustic apparatus according to claim 3, the lower housing (200), an upper housing covering to the lower housing (200) (100), said upper housing (100) It said upper housing in a housing structure of an acoustic device having a circuit board (180) which is mounted, protruding downward from the lower surface of the upper housing (100), wherein while fixing the circuit board (180) to (100) and a board base (150) surrounding the upper surface of the circuit board (180).

As described above, the upper side wall portion that forms a U-shaped groove projecting downward from the peripheral edge portion of the upper housing and opening downward, and the upper side wall portion projecting upward from the peripheral edge portion of the lower housing, are not in contact with the U-shaped groove. According to the configuration having the lower side wall portion inserted in a contact state, metal dust or the like can be prevented from entering from the gap between the upper housing and the lower housing.
In addition, according to the configuration having the board base that protrudes downward from the lower surface of the upper housing and covers the upper surface of the circuit board while fixing the circuit board, even if metal dust or the like enters the circuit board, It is possible to prevent a situation in which garbage contacts for a long time.

1． Next, the configuration of an electronic keyboard instrument according to an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 shows the assembled state of the electronic keyboard instrument housing. The upper back plate 120 of the electronic keyboard instrument is slightly inclined with respect to the vertical plane, but the central portion thereof is cut out vertically, and the terminal plate 110 is formed here. Next, FIG. 2 shows a state where the housing is disassembled. In FIG. 2, reference numeral 300 denotes a lower body front portion formed in a substantially rectangular plate shape. A keyboard 310 is attached to the upper surface of the lower body, and a through hole 302, 304, 306 is formed behind and above the keyboard 310. A plate 308 projects rearward. Reference numeral 200 denotes a lower body rear portion formed in a substantially rectangular parallelepiped shape, and projecting portions 202, 204, and 206 protrude upward in front of the upper surface thereof. Here, when the protrusions 202, 204, and 206 are fitted into the through holes 302, 304, and 306, the lower body rear portion 200 and the lower body front portion 300 are integrated to form the lower body portion. Reference numeral 100 denotes an upper panel portion which is configured to cover the lower body portions 200 and 300 while exposing the keyboard 310. Reference numerals 102L and 102R denote left and right speakers, 104 denotes an LCD display, and 106 denotes a switch group, which are attached to the upper surface of the upper panel unit 100.

2． Configuration around the Circuit Board Next, FIG. 3 is a perspective view of the upper panel 100 taken along the line BB ′ in FIG. In FIG. 3, the terminal board 110 protrudes from the upper back plate 120 to the inside of the upper panel portion 100. A rectangular plate-like guard plate 124 is fixed to the lower surface of the protruding portion so as to protrude further downward. The terminal board 110 is formed with through holes 112 and 114 through which MIDI terminals, power supply terminals and the like are inserted. In addition, on the left and right sides of the terminal plate 110, truncated conical fixing members 126 and 126 protrude downward from the lower surface of the upper surface plate 130 of the upper panel portion 100. And in the center of the truncated surface of the fixing members 126, 126, female screws 126a, 126a are formed. Although not particularly illustrated, fixing members similar to the fixing members 126 and 126 are formed at various locations on the lower surface of the upper surface plate 130 of the upper panel portion 100, and the upper panel portion 100 and the lower body portion are interposed through these fixing members. 200 and 300 are firmly fixed.

  Further, on the front surface of the terminal board 110 on the lower surface of the upper surface board 130, board bases 140, 150, 160 having a substantially rectangular cross section and a predetermined height protrude downward. The four corners of the substrate stand 140 are thick, and female screws 142,. In addition, the board | substrate bases 150 and 160 are comprised similarly to the board | substrate base 140, and the internal thread 152, ..., 152 and 162, ..., 162 is formed in each lower surface. Reference numerals 170, 180, and 190 denote rectangular printed circuit boards that are connected to each other via flat cables 402 and 404. Mounting holes 172,..., 172 are perforated at the four corners of the printed circuit board 170. When male screws (not shown) are inserted through the holes and screwed into the female screws 142,. 140 is fixed. Similarly, mounting holes 182,..., 182 and 192,..., 192 are formed in the four corners of the printed circuit boards 180, 190, and the male screws that pass through these holes are female screws 152,. , 162,..., 162 are fixed to the substrate bases 150 and 160, respectively.

  In each printed circuit board 170, 180, 190, a print pattern is formed on the upper surface (the surface in contact with the substrate table 140, 150, 160), and various components are arranged on each lower surface. Reference numerals 174 and 194 denote connectors (MIDI and power supply connectors), which are fixed so as to protrude rearward from the lower surfaces of the printed circuit boards 170 and 190, respectively. These connectors 174 and 194 are exposed to the outside through the through holes 112 and 114 of the terminal board 110 when the printed circuit boards 170 and 190 are attached to the board bases 140 and 160, respectively. Here, the printed circuit board 180 is a circuit board on which mainly digital circuits such as an interface circuit with the CPU, ROM, RAM, LCD display 104 and switch group 106 are mounted, and the printed circuit boards 170 and 190 include a power amplifier, a power circuit, and the like. Is a board on which is mounted.

3． Next, FIG. 4 shows a side view of the AA ′ cross section in the state where the electronic keyboard instrument is assembled in FIG. In the figure, a bottom plate 220 of the lower body rear portion 200 has a rectangular plate-shaped lower back plate 210 protruding upward at the rear end. In the bottom plate 220, a truncated conical fixing member 212 protrudes upward at a position facing the fixing member 126 of the upper panel portion 100. The inside of the fixing member 212 is hollow along the central axis, and a male screw insertion port 212a that opens downward from the bottom plate 220 is formed. Then, the male screw 216 is inserted into the male screw insertion port 212a from below the bottom plate 220 and is screwed into the female screw 126a (see FIG. 3) of the fixing member 126 on the upper panel portion 100 side. And the fixing member 212 are firmly fixed. Note that members other than the fixing member 212 are also provided at corresponding locations on the bottom plate 220 for the other fixing members provided in the upper panel portion 100, and the lower body rear portion 200 is provided by these fixing members. And the upper panel part 100 are fixed to each other.

  The lower back plate 210 is provided at a location located between the upper back plate 120 and the guard plate 124 in the illustrated assembled state. A U-shaped groove 122 is formed by the upper back plate 120, the guard plate 124, and the bottom portion 110 a of the terminal plate 110. The lower back plate 210 is inserted into the U-shaped groove 122 in a non-contact state with a certain amount of space (a distance not contacting with the vibration of the speakers 102L and 102R) with respect to each part of the U-shaped groove 122. . Here, even if metal dust jumps in from the gap between the upper back plate 120 and the lower back plate 210, the metal dust collides with the guard plate 124 and falls downward. It can be seen that 180 hardly touches. Furthermore, even if metal dust enters the inside of the electronic keyboard instrument and touches the lower surface of the printed circuit board 180 for a moment, the metal dust immediately falls downward, so that it is understood that, for example, the short circuit state of the circuit ends instantaneously. . That is, since the entire upper surface of the printed circuit board 180 is surrounded by the substrate table 150 and the upper surface plate 130, metal dust does not get on the upper surface of the printed circuit board 180. Therefore, the metal dust is prevented from coming into contact with the printed circuit board 180 for a long time, so that the possibility that the internal circuit is damaged is extremely small.

  Returning to FIG. 3 again, the guard plate 124 extends from approximately the center near the back of the printed circuit board 170 to approximately the center near the back of the printed circuit board 190. That is, the entire printed circuit board 180 is protected by the guard plate 124, whereas the printed circuit boards 170 and 190 are only partially protected by the guard plate 124. This is based on the difference in the circuit configuration of each printed circuit board. That is, as described above, the printed circuit board 180 is a board on which a digital circuit such as a CPU is mainly mounted. Therefore, even if a metal dust or the like is touched for a moment, a failure is likely to occur. On the other hand, since the circuits mounted on the printed circuit boards 170 and 190 are power amplifiers, power supply circuits, and the like, there is a feature that failure is relatively difficult. For this reason, the guard plate 124 is configured so as to protect the printed circuit board 180 in particular. Further, since the guard plate 124 is integrally formed with the upper panel portion 100, there are effects that the strength of the casing of the electronic keyboard instrument is improved and the deformation is prevented.

  In addition, although the said Example demonstrated the example which applied this invention to the electronic keyboard instrument, this invention is not limited to an electronic keyboard instrument, The various audio equipment which should exclude the chatter sound by vibration of a speaker Can be applied.

It is the top view and side view of the electronic keyboard musical instrument of one Example of this invention. It is an exploded view of the electronic keyboard instrument. 4 is a perspective view of the upper panel section 100 taken along the line B-B ′. FIG. It is a side view of the A-A 'section in the state where the electronic keyboard instrument was assembled.

Explanation of symbols

  100: upper panel part, 102L, 102R: speaker, 104: LCD display, 106: switch group, 110: terminal board, 110a: bottom part, 112, 114: through hole, 120: upper back board, 122: U-shaped groove, 124: Guard plate, 126, 126: Fixing member, 126a, 126a: Female screw, 130: Top plate, 140, 150, 160: Board base, 142, 152, 162: Female screw, 170, 180, 190: Printed circuit board, 172, 182, 192: mounting hole, 174, 194: connector, 202, 204, 206: protrusion, 210: lower back plate, 212: fixing member, 212a: male screw insertion port, 216: male screw, 220: bottom plate, 300: lower body front portion, 302, 304, 306: through hole, 308: coupling plate, 310: keyboard, 402, 404 Flat cable.

Claims (3)

And the lower housing, an upper housing covering to the lower housing, the housing structure of an acoustic device having a circuit board mounted on said upper housing,
A fixing member that fixes the upper housing and the lower housing to each other at a portion other than the peripheral portion;
A board base that protrudes downward from the lower surface of the upper housing and surrounds the upper surface of the circuit board together with the upper housing while fixing the circuit board;
An upper side wall portion that protrudes downward from the peripheral edge of the upper housing and forms a U-shaped groove that opens downward;
A housing structure for an acoustic device, comprising: a lower side wall portion that protrudes upward from a peripheral edge portion of the lower housing and is inserted into the U-shaped groove in a non-contact state. And the lower housing, an upper housing covering to the lower housing, the housing structure of an acoustic device having a circuit board mounted on said upper housing,
An upper side wall portion that protrudes downward from the peripheral edge of the upper housing and forms a U-shaped groove that opens downward;
A housing structure for an acoustic device, comprising: a lower side wall portion that protrudes upward from a peripheral edge portion of the lower housing and is inserted into the U-shaped groove in a non-contact state. And the lower housing, an upper housing covering to the lower housing, the housing structure of an acoustic device having a circuit board mounted on said upper housing,
A housing structure for an acoustic device, characterized by having a board base that protrudes downward from the lower surface of the upper housing and surrounds the upper surface of the circuit board together with the upper housing while fixing the circuit board.

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