JP3953375B2 - Intercom device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an intercom apparatus suitable for use by being incorporated in, for example, a control panel or an operation panel. Specifically, it meets the demands for thinner and smaller capacities that are assumed when incorporated in control panels and operation panels installed on existing wall surfaces.
[0002]
[Prior art]
For example, in an intercom apparatus suitable for use by being incorporated in a control panel or an operation panel, an apparatus having a structure as shown in FIG. That is, FIG. 3 shows an exploded perspective view. In FIG. 3, the exterior of the intercom apparatus is composed of a front casing 81 and a rear casing 82. A speaker 83 and a microphone 84, a circuit board 85 for signal processing, and the like are connected to each other by a signal line 86 inside an exterior composed of the front casing 81 and the rear casing 82.
[0003]
Further, the front housing 81 includes a front surface portion 812 provided with a through hole 811 for emitting sound from the speaker 83 to the outside, and a wall portion 813 surrounding the front surface portion 812. The circuit board 85 is provided with a through hole 851 into which the magnet 831 at the rear of the speaker 83 is inserted. Further, a cushion material 821 is provided at a position facing the magnet 831 of the rear housing 82, and functions to press the speaker 83 from the rear side to the front side in the assembled apparatus.
[0004]
Therefore, in this structure, sound generated on the front side of the diaphragm 832 of the speaker 83 is emitted to the outside through the through hole 811. On the other hand, the rear surface side of the diaphragm 832 is sealed by the rear housing 82. For this reason, the sound generated in the reverse phase on the back surface side of the diaphragm 832 is blocked, for example, the sound generated on the back surface side cancels out the sound emitted on the front surface side, and the volume decreases. The sound quality does not deteriorate and does not cause any trouble.
[0005]
The microphone 84 is provided in a cylindrical partition wall 815 connected to an opening 814 provided in the front housing 81 via a buffer material 841 for buffering. Thus, for example, sound generated on the back surface side of the diaphragm 832 of the speaker 83 is blocked by the buffer material 841 for buffering. Therefore, for example, the so-called howling or the like caused by the sound generated on the back surface side being transmitted to the microphone 84 and fed back is also eliminated.
[0006]
[Problems to be solved by the invention]
However, in the above-described intercom apparatus suitable for use by being incorporated in, for example, a control panel or an operation panel, a thickness of 20 mm or more has been generally used. However, the apparatus having such a thickness requires a considerable space on the back surface of the panel of the control panel or operation panel. Especially when the control panel or operation panel is installed on the existing wall surface, the space on the wall surface side is required. Problems such as the need for construction to install the control panel and the control panel and operation panel project from the wall surface arise.
[0007]
If a control panel, operation panel, or the like is provided so as to protrude from the wall surface as described above, there is a risk of traffic obstruction or a collision with a passerby. In order to ensure safety, a measure such as providing a guard is being carried out, but this guard protrudes further from the wall surface and further obstructs traffic. That is, the conventional apparatus generally has a thickness of 20 mm or more, so that there is a problem that the control panel or the operation panel protrudes from the wall surface to obstruct traffic.
[0008]
On the other hand, it was studied to simply reduce the thickness and capacity. However, particularly in an intercom device that amplifies and emits sound, if the thickness is simply reduced and the capacity is reduced, for example, the sound emitted to the front side of the built-in speaker and the sound emitted to the back side are generated. There is a risk that the volume will decrease or the sound quality will deteriorate due to cancellation. In addition, there is a risk of so-called howling or the like due to the sound from the speaker being picked up by the microphone and returned.
[0009]
The problem here is that the sound emitted to the back side of the speaker 83 leaks to the front side. For this reason, conventionally, the speaker 83 is pressed against the front housing 81 by the cushion material 821 to prevent sound leakage, but the presence of the cushion material 821 increases the thickness of the apparatus. That is, in order to provide such a cushioning material 821, first, the rear housing 82 needs to have sufficient rigidity, and the thickness of the cushioning material 821 is added to this, so that the thickness of the apparatus increases.
[0010]
For example, a structure as shown in FIG. 4 can be considered. That is, in this structure, sound leakage is prevented by pressing the speaker 83 against the front housing 81 using the locking means 91. However, in this configuration, the number of assembling steps such as screwing by the locking means 91 increases. In addition, a predetermined length is required for the signal line 86 for connecting the speaker 83 and the circuit board 85 that are attached to the front casing 81 in advance, and it is not easy to clean the signal line 86 during assembly. .
[0011]
This application has been made in view of the above points, and the problem to be solved is that the conventional apparatus generally has a thickness of 20 mm or more. If a control panel or operation panel is installed in the system, there are problems such as obstruction of traffic, and if this is simply reduced in thickness and capacity, the volume will decrease or the sound quality will deteriorate. In addition, the fear of howling and the like could not be resolved.
[0012]
[Means for Solving the Problems]
For this reason, the present invention has a circuit board provided with a through hole into which a magnet at the rear part of the speaker is fitted, and the circuit board is screwed to the housing from the back side of the circuit board, or a locking means In addition, a partition wall is provided on the inner side of the housing that is between a position where the speaker is provided and a wall portion and a front surface of the housing provided at the peripheral edge of the housing. A partition wall that is substantially along the inner wall of the wall portion is provided on the inner side of the housing connected to the partition wall, and the height of the partition wall is set to a height that contacts the circuit board disposed on the inner side of the wall portion of the housing. According to this, the speaker is brought into contact with the housing through the circuit board, and sound leakage can be further effectively prevented by the partition wall , and the thickness of the device is set to 10 mm or less. Especially control panels installed on existing walls, etc. Thinner, which is assumed to include them in the work machine, it is possible to meet the demands of small capacity.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
That is, in the intercom device according to the present invention, the housing including the front portion provided with a through hole for emitting sound from the speaker to the outside and the wall portion surrounding the front portion and the magnet at the rear portion of the speaker are fitted. A circuit board provided with a through-hole, the outer shape of the circuit board being substantially in line with the inner side of the wall, and the circuit board in a state in which the magnet of the rear part of the speaker is fitted to the wall of the housing The partition wall is provided inside the housing between the arbitrary opening location of the wall and front surface of the housing provided at the peripheral edge of the housing and the position where the speaker is provided. A partition wall substantially along the inner wall of the wall portion is provided on the inner side of the housing connected to the housing, and the height of the partition wall is set to a height that contacts the circuit board disposed inside the wall portion of the housing . Screw the circuit board to the housing from the back side, Those comprising engaged by Taha locking means.
[0014]
Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view showing an embodiment of an intercom apparatus to which the present invention is applied.
[0015]
In FIG. 1, in this embodiment, only the front housing 1 is provided as the exterior of the intercom device. The front housing 1 includes a front surface portion 13 provided with a through hole 11 for emitting sound from the speaker 2 to the outside and an opening portion 12 for collecting sound from the microphone 3, and the front surface portion 13. And a wall portion 14 surrounding the perimeter. Further, a speaker 2 and a microphone 3, a circuit board 4 for signal processing, and the like are provided inside the front housing 1.
[0016]
Further, on the inner surface side of the front housing 1, a protrusion 15 for screwing with a screw 5 at the center and a locking means 16 at the periphery are provided. In addition, the partition wall 17 surrounding the opening 161 provided for die-cutting of the locking means 16 together with the wall portion 14, the partition wall 19 surrounding the opening 191 provided with an external connection terminal (not shown), and the above-described microphone 3 is provided with a cylindrical partition wall 18 connected to the opening 12 for picking up the sound at 3. Further, a partition wall 141 for receiving the above-described circuit board 4 is provided, and the heights of the protrusions 15, the locking means 16, the partition walls 17, 18, 19, 141 are substantially the same.
[0017]
Furthermore, a through hole 41 into which the magnet 21 at the rear part of the speaker 2 is inserted is provided in the circuit board 4. An adhesive means 42 such as a double-sided tape is provided around the through hole 41, and the base portion on the speaker 2 side of the magnet 21 inserted into the through hole 41 and the circuit board 4 are adhered by the adhesive means 42. Accordingly, the speaker 2 and the circuit board 4 are integrally formed in advance. Thereby, the length of the signal line 6 for connecting the speaker 2 and the circuit board 4 is minimized.
[0018]
The microphone 3 is also integrally coupled to a position corresponding to the cylindrical partition wall 18 connected to the opening 12 of the circuit board 4. Further, a ring-shaped cushioning material 43 is bonded and provided at a position facing the partition wall 18 of the circuit board 4. A buffer material 31 for buffering is provided in the gap between the microphone 3 and the partition wall 18. Note that both of these buffer materials 43 and 31 may be provided, or one of them may be provided. Thus, for example, sound generated on the back side of the diaphragm 22 of the speaker 2 is transmitted to the microphone 3 and is not fed back.
[0019]
Further, the circuit board 4 is provided with an opening 44 at a position facing the terminal board 23 provided on the back surface of the speaker 2 so that the terminal board 23 does not collide with the circuit board 4. In addition, a hole 45 through which the above-described screw 5 is inserted is provided at the center of the circuit board 4, and a notch 46 that is locked by the locking means 16 of the above-described front housing 1 is provided at the periphery. Provided. The entire circuit board 4 is fitted inside the wall portion 14 of the front housing 1 and has a shape that can be received by the partition wall 141 described above.
[0020]
That is, the speaker 2, the microphone 3, and the circuit board 4 are integrally connected in advance. The circuit board 4 is fitted inside the wall portion 14 of the front casing 1, and the notch 46 of the circuit board 4 is locked by the locking means 16 of the front casing 1. Further, an insulating thin plate 7 that covers the entire inner surface of the wall portion 14 is provided on the back side of the circuit board 4. The insulating thin plate 7 and the circuit board 4 are screwed to the front housing 1 with screws 5 to assemble the entire intercom device.
[0021]
In this case, the speaker 2 is brought into contact with the front casing 1 by screwing the front casing 1 with the screw 5 and locking the notch 46 of the circuit board 4 with the locking means 16. The partition walls 17, 18, 19, 141, etc. are in contact with the circuit board 4. As a result, leakage of sound from the back side of the speaker 2 is well prevented, and the possibility of so-called howling due to the sound transmitted to the microphone 3 and fed back is also prevented.
[0022]
In the illustrated embodiment, the above-described locking means 16 is formed by the hook-shaped locking means 16 and the notch 46, but this can also be formed by other means such as screwing. That is, in the case of screwing, a protrusion similar to the protrusion 15 is provided in a corresponding portion of the front housing 1, and a hole similar to the hole 45 is provided in a corresponding portion of the circuit board 4, and an arbitrary screw is used. Can be screwed. In the case of this screwing, the man-hour is increased as compared with the illustrated locking means 16, but the occurrence of sound leakage can be further reduced.
[0023]
In addition, the partition wall 17 of the locking means 16 described above is provided between the locking means 16 and the speaker 2 in the illustrated embodiment, but the locking means or screw in which the opening 161 is not provided in the locking means 16. In the case of fastening, the partition wall 17 may be provided between the locking means 16 and the housing wall 14.
[0024]
Further, FIG. 2 shows a front view and a sectional view of the assembled intercom apparatus. However, the cross-sectional view is generally a longitudinal section of the central portion of the apparatus, but some positions and directions are different for the sake of explanation.
[0025]
In FIG. 2, in the front view, a shape in which the protective grid 111 formed excluding the through holes 11 of the above-described front housing 1 avoids the wiring lead-out portion 24 protruding to the front side of the diaphragm 22 of the speaker 2, Or thickness. In the cross-sectional view, the portion of the protective lattice 111 excluding the through holes 11 is thick enough not to contact the diaphragm 22 of the speaker 2 as indicated by the broken line, and the drawer portion 24 is disposed at the position of the through holes 11. Alternatively, the thickness of the protective grating 111 at the position of the drawer portion 24 is cut.
[0026]
Whether the drawer part 24 is arranged at the position of the through hole 11 or whether the thickness of the protective grid 111 at the position of the drawer part 24 is cut or both may be performed. Further, the shape of the through hole 11 is not limited to the illustrated shape. For example, when the shape of the through hole 11 is concentric from the center of the speaker 2, for example, when the speaker 2 having a circular outer shape is attached. In addition, even if the mounting angle is rotated at the position of the through hole 11, the position of the drawer portion 24 is moved along the concentric circle so that the position of the drawer portion 24 does not deviate from the position of the through hole 11. Is.
[0027]
Further, in the cross-sectional view, the height of the circuit element 47 provided on the front and back of the circuit board 4 is within the height of the speaker 2 with the rear magnet 21 fitted on the front side of the circuit board 4 and the circuit board 4. On the back side, the height is smaller than the vicinity of the height at which the rear magnet 21 protrudes. Thereby, the total thickness of the intercom apparatus can be made substantially equal to the thickness of the speaker 2 including the rear magnet 21. In other words, the minimum thickness can be achieved.
[0028]
As a result, according to the above-described embodiment, the casing 1 including the front surface portion 13 provided with the through hole 11 for emitting sound from the speaker 2 to the outside and the wall portion 14 surrounding the front surface portion 13, and the speaker 2 and a circuit board 4 provided with a through-hole 41 into which the rear magnet 21 is fitted. The outer shape of the circuit board 4 is substantially in line with the inner side of the wall portion 14, and the rear magnet 21 of the speaker 2. The circuit board 4 in the fitted state is disposed inside the wall portion 14 of the housing 1, and the circuit board 4 is screwed to the housing 1 from the back side of the circuit board 4.
[0029]
Further, the screw 5 is fastened to the housing 1 at the center of the circuit board 4, and screwing or locking means 16 are provided at a plurality of locations on the peripheral edge of the circuit board 4. Further, an insulating thin plate 7 that covers the entire inner surface of the wall portion 14 is provided on the back side of the circuit board 4, and the insulating thin plate 7 is screwed to the housing 1 together with the circuit board 4. Further, an opening 44 is provided in a portion of the circuit board 4 that contacts the terminal plate 23 at the rear of the speaker 2. Further, the protective grid 111 formed excluding the through holes 11 of the housing 1 has a shape or a thickness that avoids the wiring lead-out portion 24 on the front surface of the speaker 2 and a thickness that does not contact the diaphragm 22 of the speaker 2. It is what is done.
[0030]
Further, the magnet 21 at the rear part of the speaker 2 and the through hole 41 provided in the circuit board 4 are fitted, and the speaker 2 and the circuit board 4 are integrally coupled in advance. In addition, an opening 12 where the microphone 3 is exposed is provided in the front surface portion 13 of the housing 1, and a cylindrical partition wall 18 is provided inside the housing 1 corresponding to the opening 12, so that the microphone 3 is the partition wall. The partition wall 18 is installed on the circuit board 4 so as to be disposed within the circuit board 18, and the height of the partition wall 18 is set so as to contact the circuit board 4 disposed inside the wall portion 14 of the housing 1. .
[0031]
Further, a buffer material 43 is provided around the microphone 3 installed on the circuit board 4 to fill a gap with the cylindrical partition wall 18. Further, the wall portion 14 includes a partition wall 141 connected to partition walls 17 and 19 provided inside the housing 1 between a position where the openings 161 and 191 on the peripheral edge of the housing 1 are provided and a position where the speaker 2 is provided. The partition walls 17, 19, and 141 are arranged so as to be in contact with the circuit board 4 disposed inside the wall portion 14 of the housing 1. The height of the circuit element 47 provided on the front and back of the circuit board 4 is within the height of the speaker 2 with the rear magnet 21 fitted on the front side of the circuit board 4 and on the rear side of the circuit board 4. The height is smaller than the vicinity of the height at which the magnet 21 protrudes.
[0032]
Therefore, in this embodiment, by having a circuit board provided with a through-hole into which a magnet on the rear part of the speaker is fitted, the circuit board is screwed to the housing from the back side of the circuit board. The speaker is brought into contact with the housing via the circuit board and can effectively prevent sound leakage, and the thickness of the device is set to 10 mm or less, particularly a control panel installed on an existing wall surface, etc. It is possible to meet the demands for thinner and smaller capacities that are assumed when incorporated in operation panels.
[0033]
As a result, the conventional apparatus generally has a thickness of 20 mm or more, and therefore, particularly when a control panel or an operation panel is installed on an existing wall surface or the like, there is a problem such as obstruction of traffic. On the other hand, according to the present invention, simply reducing the thickness and reducing the capacity could not eliminate the risk of volume reduction, sound quality deterioration, or so-called howling. These problems can be easily solved.
[0034]
Thus, according to the above-described intercom apparatus, the housing including the front portion provided with a through hole for releasing sound from the speaker and the wall portion surrounding the front portion and the magnet at the rear portion of the speaker are fitted. A circuit board provided with a through-hole, the outer shape of the circuit board being substantially in line with the inner side of the wall, and the circuit board in a state in which the magnet of the rear part of the speaker is fitted to the wall of the housing The partition wall is provided inside the housing between the arbitrary opening location of the wall and front surface of the housing provided at the peripheral edge of the housing and the position where the speaker is provided. A partition wall substantially along the inner wall of the wall portion is provided on the inner side of the housing connected to the housing, and the height of the partition wall is set to a height that contacts the circuit board disposed inside the wall portion of the housing . Screw the circuit board to the housing from the back side. By engaging the locking means, it is possible to effectively prevent leakage of sound, in which it is possible to reduce the thickness of the device.
[0035]
Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
[0036]
【The invention's effect】
Therefore, according to the first aspect of the present invention, the circuit board is provided with a through hole into which the magnet at the rear part of the speaker is fitted, and the circuit board is screwed to the housing from the back side of the circuit board, or In addition, a partition wall is provided on the inner side of the casing between the arbitrary opening of the wall and front surface of the casing provided at the peripheral edge of the casing and the position where the speaker is provided. And a partition wall substantially along the inner wall of the wall portion is provided inside the housing connected to the partition wall, and the height of the partition wall is a height that abuts on a circuit board disposed inside the wall portion of the housing. As a result, the loudspeaker is brought into contact with the housing via the circuit board, or sound leakage can be more effectively prevented by the partition wall , and the thickness of the device is made 10 mm or less, particularly in the existing installation. Control panels and operations installed on walls, etc. Thinner envisaged when incorporated into and is able to meet the demand for small-capacity.
[0037]
According to the invention of claim 2, screwing to the housing is performed at the center of the circuit board, and screw fastening or locking means are provided at a plurality of locations on the peripheral edge of the circuit board, thereby leaking sound. Can be more effectively prevented.
[0038]
According to the invention of claim 3, the insulating thin plate that covers the entire inner surface of the wall portion is provided on the back side of the circuit board, and the insulating thin plate is screwed to the housing together with the circuit board to insulate sound leakage. Even a thin plate can be effectively prevented.
[0039]
According to the fourth aspect of the present invention, the thickness of the device can be further reduced by providing the opening in the portion of the circuit board that contacts the terminal plate at the rear of the speaker.
[0040]
According to the invention of claim 5, the protective grid formed excluding the through-holes of the housing has a shape or thickness that avoids the wiring lead-out portion on the front surface of the speaker, and does not contact the diaphragm of the speaker. By making it thick, the thickness of the device can be made substantially the thickness of the speaker.
[0041]
According to the invention of claim 6, the magnet at the rear part of the speaker and the through hole provided in the circuit board are fitted, and the speaker and the circuit board are joined together in advance, so that sound leakage is prevented. Further, it can be effectively prevented and can be easily assembled.
[0042]
According to the seventh aspect of the present invention, an opening through which the microphone is exposed is provided on the front surface of the housing, and a cylindrical partition is provided on the inner side of the housing corresponding to the opening. Is placed on the circuit board so as to be disposed in the partition wall, and the height of the partition wall is set to a height that abuts on the circuit board disposed on the inside of the wall portion of the housing. The fear that arises can be eliminated.
[0043]
Further, according to the invention of claim 8, by providing a cushioning material around the microphone installed on the circuit board and filling the gap with the cylindrical partition wall, it is possible to further eliminate the possibility of so-called howling and the like. It is something that can be done.
[0045]
According to the invention of claim 9 , the height of the circuit elements provided on the front and back of the circuit board is within the height of the speaker with the rear magnet fitted on the front side of the circuit board, and the circuit board On the back side, the thickness of the device can be made extremely thin by setting the height smaller than the vicinity of the height at which the rear magnet protrudes.
[0046]
As a result, the conventional apparatus generally has a thickness of 20 mm or more, and therefore, particularly when a control panel or an operation panel is installed on an existing wall surface or the like, there is a problem such as obstruction of traffic. On the other hand, according to the present invention, it is not possible to eliminate the risk of volume reduction, sound quality degradation, howling, etc. by simply reducing the thickness and reducing the volume. This problem can be easily solved.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an embodiment of an intercom apparatus to which the present invention is applied.
FIGS. 2A and 2B are a front view and a sectional view for explanation.
FIG. 3 is an exploded perspective view showing a conventional intercom apparatus.
FIG. 4 is an exploded perspective view showing another conventional intercom apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Front housing | casing, 11 ... Through-hole, 111 ... Protection grid, 12 ... Opening part, 13 ... Front part, 14 ... Wall part, 15 ... Projection part, 16 ... Locking means, 17, 18, 19, 141 ... partition wall 161, 191 ... opening, 2 ... speaker, 21 ... magnet, 22 ... diaphragm, 23 ... terminal plate, 24 ... wiring lead-out part, 3 ... microphone, 31 ... buffer material, 4 ... circuit board, 41 ... Through hole, 42 ... bonding means, 43 ... buffer material, 44 ... opening, 45 ... hole, 46 ... notch, 47 ... circuit element, 5 ... screw, 6 ... signal wire, 7 ... insulating thin plate

Claims (9)

A housing comprising a front surface portion provided with a through hole for emitting sound from the speaker to the outside and a wall portion surrounding the front surface portion;
It has a circuit board provided with a through-hole into which the magnet at the rear of the speaker is fitted,
The outer shape of the circuit board is a shape substantially along the inner side of the wall,
The circuit board in a state in which a magnet at the rear part of the speaker is fitted is arranged inside the wall part of the housing,
A partition wall is provided on the inner side of the housing between the arbitrary opening location of the wall portion and the front surface portion of the housing provided at the peripheral portion of the housing and the position where the speaker is provided,
A partition wall substantially along the inner wall of the wall portion is provided inside the housing connected to the partition wall,
The height of the partition wall is a height that abuts on the circuit board disposed inside the wall portion of the housing,
The intercom apparatus, wherein the circuit board is screwed to the casing from the back side of the circuit board or locked by a locking means. The intercom apparatus according to claim 1, wherein
While screwing to the housing is performed at the center of the circuit board,
An intercom apparatus, wherein screwing or locking means are provided at a plurality of locations on the peripheral edge of the circuit board. The intercom apparatus according to claim 1, wherein
Provide an insulating thin plate covering the entire inner surface of the wall on the back side of the circuit board,
The intercom device, wherein the insulating thin plate is screwed to the casing together with the circuit board or locked by a locking means. The intercom apparatus according to claim 1, wherein
An interphone device, wherein an opening is provided in a portion of the circuit board that contacts a terminal plate at the rear of the speaker. The intercom apparatus according to claim 1, wherein
The protective grid formed except for the through-holes of the housing is shaped or thick enough to avoid the wiring lead-out portion on the front surface of the speaker, and thick enough not to contact the diaphragm of the speaker. A featured intercom device. The intercom apparatus according to claim 1, wherein
The rear magnet of the speaker and the through hole provided in the circuit board are fitted,
The interphone apparatus, wherein the speaker and the circuit board are integrally coupled in advance. The intercom apparatus according to claim 1, wherein
The front portion of the housing is provided with an opening through which a microphone is exposed,
A cylindrical partition is provided inside the housing corresponding to the opening,
Installed on the circuit board so that the microphone is disposed in the partition;
The intercom apparatus, wherein the height of the partition wall is a height that makes contact with the circuit board disposed inside the wall portion of the housing. The intercom device according to claim 7, wherein
An intercom apparatus, wherein a cushioning material is provided around the microphone installed on the circuit board to fill a gap with the cylindrical partition wall. The intercom apparatus according to claim 1, wherein
The height of the circuit elements provided on the front and back of the circuit board is within the height of the speaker with the rear magnet fitted on the front side of the circuit board, and the rear magnet on the back side of the circuit board. The intercom device is characterized in that the height is smaller than the vicinity of the protruding height.

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