JP6216269B2 - Intercom device - Google Patents

Description

  The present invention relates to an interphone device in which a speaker and a microphone operate simultaneously, such as an interphone remote controller for a water heater.

  Conventionally, in this type of interphone remote control device for a water heater, as shown in Patent Document 1, a front case and a rear case are provided with a case body composed of a front case and a rear case, and a cover covering the front of the case body. And the cover each have a sound transmission hole for a speaker and a sound transmission hole for a microphone, and a speaker and a microphone are attached to the back surface of the sound transmission hole for the speaker and the sound transmission hole for the microphone, respectively. .

JP 2006-33494 A

  However, in this conventional system, when the interphone call system is changed from the conventional one-way switching call system to the two-way simultaneous call system using a voice switch that has been adopted in recent years, both the speaker and the microphone are effective during the call. Since the microphone is attached to the front case, noise enters from the gap between the packing that covers the microphone and the case, and the microphone picks up this, so it is difficult to hear the noise from the other speaker. It had a problem to say.

In order to solve the above-mentioned problems, the present invention provides a front case in which a sound transmission hole for microphones is opened on the front surface, a rear case for closing the back side of the front case to accommodate an electrical circuit board, and the microphone transmission hole. A microphone holding cylinder portion erected on the back side of the front case around the sound hole, a bottomed cylindrical inner cylinder packing in which a microphone is mounted with the sound collection surface facing the sound transmission hole for the microphone, and a sound transmission A hinge body comprising a bottomed cylindrical outer cylinder packing that has a hole in the bottom surface and is fitted over the sound collecting surface from the outside of the inner cylinder packing is fitted to the microphone holding cylinder portion. In this case, a taper portion having an oblique cut is formed on the outer periphery of the tip of the outer cylinder packing, and a rubber O-ring is provided at a corner portion of the microphone holding cylinder portion in contact with the taper portion.

  As described above, according to the present invention, the rubber O-ring closes the gaps between the front case and the outer cylinder packing and between the outer cylinder packing and the inner cylinder packing, and thus enters from these gaps. The microphone picks up the generated noise and reliably prevents such noise from being heard from the speaker at the other end, so that the interphone can always be used satisfactorily.

The disassembled perspective view of the intercom remote control apparatus of one Embodiment of this invention. The perspective view of the front case back surface of the same embodiment. The perspective view of the cover back surface of the same embodiment. Sectional drawing of the principal part of the microphone attachment part of the same embodiment.

  Next, an intercom remote control device according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is an exploded perspective view of an interphone remote control device 1. A liquid crystal display unit 5 is provided on a thin box-shaped case body 4 composed of a front case 2 covering the front side of a built-in component and a rear case 3 covering the rear side. And a plurality of switches 6, an electrical board 7 equipped with electronic parts such as a voice switch (not shown), a speaker 8, a microphone 9, and the like, and a cover for holding a plurality of operation keys 10 on the front side of the front case 2. 11 is attached.

  The front case 2 is made of a transparent resin so that the display content of the liquid crystal display unit 5 can be visually recognized, and an operation element 12 that can be moved back and forth is provided at a position corresponding to the plurality of switches 6 on the electrical board 7. A waterproof film 13 for preventing water from entering is attached to the surface corresponding to each operation element 12.

  A speaker sound transmission hole 14 and a microphone sound transmission hole 15 are opened near the left and right ends of the front surface of the front case 2, and a space between the front case 2 and the cover 11 is provided above the speaker sound transmission hole 14. A gutter 16 is provided to prevent the water that has entered from directly entering the speaker sound transmission hole 14, and a microphone waterproof sheet 17 is adhered to the microphone sound transmission hole 15.

  Further, a partition-like front rib 18 is erected so as to protrude to the front side of the front case 2 in a direction orthogonal to a straight line connecting the speaker sound transmission hole 14 and the microphone sound transmission hole 15. The front ribs 18 are provided below the both ends of the portion projecting to the front side corresponding to the liquid crystal display portion 5 of the front case 2 so as not to contact the back surface of the cover 11.

  The cover 11 is made of an opaque resin and has a display opening 19 opened at a position corresponding to the liquid crystal display section 5 and a speaker sound transmission opened at a position corresponding to the speaker sound transmission hole 14 of the front case 2. A hole 20 and a microphone sound transmission hole 21 opened at a position corresponding to the microphone transmission hole 15 of the front case 2 are provided, and corresponds to the operation key 10 so that the operation key 10 is exposed. The position is opened, and the arm portion 10a of the operation key 10 is sandwiched between the cover 11 and the front case 2 and fixed.

  FIG. 2 is a perspective view of the back surface of the front case 2, and a cylindrical speaker holding cylinder portion 22 for mounting the speaker 8 is erected around the speaker sound transmission hole 14, and around the speaker holding cylinder portion 22. , A boss part 24 to which the speaker fixing screw 23 is screwed and a plurality of reinforcing ribs 25 to improve the rigidity of the speaker holding cylinder part 22 are arranged radially (about 45 ° here).

  The speaker 8 is mounted in the speaker holding cylinder portion 22 together with the speaker packing 26 that covers the front side peripheral portion of the speaker 8, and the speaker fixing screw 23 is screwed to the rear end of the speaker 8 via the speaker pressing bracket 27. Fixed to case 2.

  In addition, a porous sound absorbing material 29 attached to the cylindrical portion 28 of the rear case 3 is disposed at the back surface position of the speaker 8 to suppress the sound from flowing from the back surface of the speaker 8 to the microphone 9 side.

  As shown in FIG. 4, a cylindrical microphone holding cylinder portion 30 for mounting the microphone 9 is erected around the microphone sound transmission hole 15, and the microphone 9 has a sound collecting surface in the microphone sound transmission hole 15. A bottomed cylindrical inner cylinder packing 31 that is mounted in a state of facing the rubber, and a rubber bottomed cylindrical shape that has a sound transmission hole 32 on the bottom surface and is fitted to the outside of the inner cylinder packing 31. A hinge body 34 composed of the outer cylinder packing 33 is fitted into the microphone holding cylinder portion 30 with the microphone 9 still attached. A hinge body in which a taper portion 35 is formed, and a rubber O-ring 36 provided at a corner portion of the microphone holding cylinder portion 30 is crushed by the taper portion 35 and the microphone 9 is attached to the microphone holding cylinder portion 30. 34 to fit the front case 2 and the outer cylinder pack. The gaps between the inner cylinder packing 31 and the inner cylinder packing 31 and the outer cylinder packing 33 are pressed against the O-ring 36 itself or the O-ring 36 so that the inner cylinder packing 31 and the outer cylinder packing 33 are in close contact with each other. The intercom can be satisfactorily used by reliably preventing noise from entering the microphone 9 through these gaps, and the rear end of the hinge body 34 is pressed by the electrical board 7 and the front case 2 Fixed to.

  A partition-like back side rib 37 is erected so as to protrude from the back side of the front case 2 in a direction orthogonal to a straight line connecting the speaker sound transmission hole 14 and the microphone sound transmission hole 15. A plurality (two in this case) of back side ribs 37 are provided near the center of the liquid crystal display unit 5 in the left-right direction, and are provided at a distance from the speaker 8.

  FIG. 3 is a perspective view of the back surface of the cover 11, and screen-like cover-side ribs 38 are provided on both sides of the display opening 19 so as to protrude vertically on the back side of the cover 11. When the cover 11 is attached to the front case 2, the cover-side rib 38 is located outside the front-side rib 18, that is, on the speaker 8 side than the front-side rib 18 on the speaker 8 side, and from the front-side rib 18 on the microphone 9 side. Is provided at a position on the microphone 9 side so as not to contact the surface of the front case 2.

  One set of the interphone remote control devices 1 is installed at a different location, and the interphone remote control devices 1 can perform interphone calls using the bidirectional simultaneous call method.

  During a call using this two-way simultaneous call method, both the speaker 8 and the microphone 9 operate effectively, and the sounds collected from the microphones 9 of the intercom remote control devices 1 are compared by a voice switch. The right to transmit is granted to the intercom remote control device 1. Here, the interphone remote control device 1 to which the transmission right is first assigned is referred to as a remote control A, and the interphone remote control device 1 to which the transmission right is not initially assigned is referred to as a remote control B.

  Then, the sound collected by the microphone 9 of the remote control A is generated by the speaker 8 of the remote control B. At the same time, the sound collected by the microphone 9 of the remote control B is sent to the voice switch to be sent to the microphone 9 of the remote control A. Continue to compare with the sound collected in.

  When the sound collected by the microphone 9 of the remote control B is larger than the sound collected by the microphone 9 of the remote control A, the right to transmit is switched from the remote control A to the remote control B, and the sound is collected by the microphone 9 of the remote control B. Sound is generated by the speaker 8 of the remote control A, and at the same time, the sound collected by the microphone 9 of the remote control A is sent to the voice switch and continuously compared with the sound collected by the microphone 9 of the remote control B. The intercom call is performed using the two-way simultaneous call method.

  Therefore, in the interphone remote control device 1 on the side to which the transmission right is not granted, there is always a possibility that the sound produced by the speaker 8 will circulate to the microphone 9, but the speaker 8 is connected to the speaker holding cylinder 22 via the speaker packing 26. In addition, since the speaker holding cylinder portion 22 is in contact with the front case 2 and is reinforced by the reinforcing ribs 25 arranged radially, vibration is hardly transmitted from the speaker 8 to the front case 2. The vibration that propagates to the microphone 9 fixed to the case 2 is reduced, and howling is less likely to occur.

  Further, the vibration transmitted from the speaker 8 to the front case 2 is caused by the presence of the back-side rib 37 and / or the front-side rib 18 whose rigidity is enhanced in a direction orthogonal to the vibration traveling direction from the speaker 8 to the microphone 9 side. The vibration that travels through the case 2 from the speaker 8 to the microphone 9 beyond the back rib 37 and the front rib 18 is attenuated, and the vibration that propagates solidly to the microphone 9 is reduced, making it difficult for howling.

  On the other hand, the sound emitted from the speaker 8 tries to enter the microphone 9 in the space between the front surface side of the front case 2 and the back surface side of the cover 11, but there is a barrier due to the cover side rib 38 and the front side rib 18. Since there are a total of four of each two, the sound propagating through this space is blocked, and the sound that circulates from the speaker 8 to the microphone 9 is reduced, so that howling is less likely to occur.

  Further, the microphone 9 has a bottom cylinder-shaped inner cylinder packing 31 made of rubber and mounted on the bottom surface of the inner cylinder packing, with the sound collection surface facing the sound transmission hole 15 for the microphone. Since the hinge body 34 including the bottomed cylindrical outer cylinder packing 33 fitted to the outside of the microphone 31 is fitted to the microphone holding cylinder portion 30 with the microphone 9 still attached. The taper portion 35 of the oblique cut at the outer periphery of the tip of the outer cylinder packing 33 is fitted with the rubber O-ring 36 provided at the corner portion of the microphone holding cylinder portion 30 while being crushed. Respective gaps between the outer cylinder packing 33 and between the inner cylinder packing 31 and the outer cylinder packing 33 are pressed by the O-ring 36 itself or the O-ring 36 so that the inner cylinder packing 31 and the outer cylinder packing 33 are connected. Closely closed, the microphone from these gaps And reliably prevent intrusion of noise into, in which to be able use satisfactorily interphone.

DESCRIPTION OF SYMBOLS 1 Intercom remote control apparatus 2 Front case 3 Rear case 7 Electrical board 8 Speaker 9 Microphone 14 Speaker sound transmission hole 15 Microphone sound transmission hole 30 Microphone holding cylinder part 31 Inner cylinder packing 32 Sound transmission hole 33 Outer cylinder packing 34 Hinge body 35 Taper 36 O-ring

Claims (1)

A front case with a microphone sound transmission hole opened on the front surface, a rear case for closing the back side of the front case to accommodate the electrical circuit board, and a back side of the front case around the microphone sound transmission hole A microphone holding cylinder portion, a bottomed cylindrical inner cylinder packing on which a microphone is mounted with a sound collection surface facing the sound transmission hole for the microphone, and a sound transmission hole on the bottom surface of the inner cylinder packing. A hinge body composed of a bottomed cylindrical outer cylinder packing that is fitted to cover the sound collecting surface from the outside is fitted to the microphone holding cylinder portion, and is attached to the outer periphery of the tip of the outer cylinder packing. Is an interphone device characterized in that it forms an oblique cut taper portion and a rubber O-ring is provided at the corner portion of the microphone holding cylinder portion in contact with the taper portion.

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