JP2014192779A - Intercom device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress generation of howling due to sneaking from a speaker to a microphone through a front case, in an intercom device where the speaker and microphone are fixed to the front case.SOLUTION: An intercom device includes a front case 2 having a sound transmission hole 14 for speaker and a sound transmission hole for microphone opened in the front surface, a rear case for housing an electrical substrate by closing the rear side of the front case 2, a speaker holding cylinder 22 standing on the rear side of the front case 2 around the sound transmission hole 14 for speaker, a speaker inserted into the speaker holding cylinder 22 and fixed in place, and a microphone fixed to the rear side of the front case 2 at a position corresponding to the sound transmission hole for microphone. Reinforcement ribs 25 are provided radially on the rear side of the front case 2 around the speaker holding cylinder 22.

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 case body including a front case and a rear case, and a cover that covers the front of the case body are provided. The speaker has a sound transmission hole and a microphone sound transmission hole, and a speaker and a microphone are respectively attached to the back surface of the speaker transmission hole and the microphone transmission hole in the front case.

JP 2006-33494 A

  However, in this conventional system, when the interphone call method is changed from the conventional one-way switching call method to the two-way simultaneous call method using the voice switch which has been adopted in recent years, both the speaker and the microphone are effective during the call. Since the speaker and the microphone are attached to the front case, the vibration generated by the speaker propagates through the front case in a solid state, and the microphone picks up this, and howling is likely to occur.

  Therefore, in order to solve the above-described problems, the present invention provides a front case in which a speaker sound transmission hole and a microphone sound transmission hole are opened on the front surface, and a rear case for closing the back side of the front case to accommodate the electrical circuit board. A case, a speaker holding cylinder portion erected on the back side of the front case around the sound transmission hole for the speaker, a speaker inserted and fixed in the speaker holding cylinder portion, and a position corresponding to the sound transmission hole for the microphone And a microphone fixed to the back side of the front case, and reinforcing ribs radially provided on the back side of the front case around the speaker holding cylinder.

  Further, a partition-like rib projecting on the front side or the back side of the front case is provided in a direction substantially orthogonal to a straight line connecting the speaker and the microphone.

  Further, a cover is provided to cover the front surface of the front case, and the rib protrudes to the front side of the front case, and the partition protrudes to the back side of the cover in a direction parallel to the rib protruding to the front case front side. A cover-side rib was provided.

  According to the present invention, since the rigidity around the speaker holding tube portion of the front case is improved by the radial reinforcing rib, it is difficult for vibration to be transmitted from the speaker to the front case, and the solid propagation to the microphone fixed to the front case is the same as the speaker. Howling is less likely to occur.

  In addition, there is a partition-like back rib and / or front rib provided between the speaker and the microphone in a direction substantially orthogonal to the straight line connecting the speaker and the microphone, so that the straight line connecting the speaker and the microphone is substantially omitted. The rigidity in the orthogonal direction is increased, and the vibration from the speaker through the front case to the microphone beyond the partition-like rear rib and / or front rib is attenuated, and the solid propagation to the microphone is reduced and howling does not occur easily. Become.

  Also, the sound that propagates through the space between the cover and the front case is blocked by the cover-side rib and the front-side rib that protrudes to the front side of the front case, and the sound that goes around from the speaker to the microphone is reduced, making it difficult for howling.

The disassembled perspective view of the intercom remote control apparatus of one Embodiment of this invention Perspective view of the back of the front case of the same embodiment Perspective view of the back side of the same embodiment

  Next, an interphone remote controller 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, a built-in electrical board 7 having electronic parts such as a voice switch (not shown), a speaker 8, a microphone 9, etc. 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.

  A cylindrical microphone holding cylinder 30 for attaching the microphone 9 is provided around the microphone sound transmission hole 15, and the microphone 9 is covered with the rubber microphone holder 31 in the microphone holding cylinder 30. The rear end of the microphone holder 31 is pressed by the electrical board 7 and fixed to the front case 2.

  A partition-like back side rib 32 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 the back-side ribs 32 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 33 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 33 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 32 and / or the front side rib 18 whose rigidity is enhanced in the direction orthogonal to the direction of the vibration 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 32 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 through 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 33 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.

  In addition, this invention is not limited to the said one Embodiment, It can modify | change within the range which does not change the summary of invention.

DESCRIPTION OF SYMBOLS 1 Intercom remote control apparatus 2 Front case 3 Rear case 7 Electrical board 8 Speaker 9 Microphone 11 Cover 14 Speaker sound transmission hole 15 Microphone sound transmission hole 18 Front side rib 22 Speaker holding cylinder part 25 Reinforcement rib 32 Back side rib 33 Cover side rib

Claims (3)

  A front case in which the sound transmission hole for the speaker and the sound transmission hole for the microphone are opened on the front surface, a rear case for closing the back side of the front case to accommodate the electrical circuit board, and the sound transmission hole for the speaker A speaker holding cylinder portion standing on the back side of the front case, a speaker inserted and fixed in the speaker holding cylinder portion, and a microphone fixed on the back side of the front case at a position corresponding to the microphone sound transmission hole And an intercom device characterized in that reinforcing ribs are provided radially on the back side of the front case around the speaker holding cylinder.   2. The intercom apparatus according to claim 1, wherein a partition-like rib projecting on the front side or the back side of the front case is provided in a direction substantially perpendicular to a straight line connecting the speaker and the microphone.   A cover that covers the front surface of the front case is provided, and the rib protrudes to the front side of the front case, and a partition-like shape that protrudes to the back side of the cover in a direction parallel to the rib protruding to the front case front side. The intercom apparatus according to claim 2, further comprising a cover-side rib.

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