JP3584581B2 - Speaker fixing structure - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a speaker fixing structure for fixing a speaker in a housing.
[0002]
[Prior art]
In general, in a door phone system, a telephone call is made between a child device arranged at a front entrance or the like and a parent device arranged indoors. Therefore, a speaker is built in a housing of the parent device or the child device. As a technique for fixing such a speaker to a housing, for example, there is a technique as shown in FIG. That is, the normal housing 1 is formed by a box-shaped body 10 having an open front surface and a cover 20 coupled to the front surface side of the body 10, and the speaker 5 is in close contact with the inner surface of the front wall of the cover 20. It is often attached with. In the example shown in FIG. 11, a holding member 61 is arranged on the back surface side of the speaker 5, and a peripheral portion of the holding member 61 is fixed by a fixing screw 62 screwed to the cover 20.
[0003]
As shown in FIG. 12, packings 63 and 64 are sandwiched between the rear surface of the speaker 5 and the body 10 and between the front surface of the speaker 5 and the cover 20, respectively. 5 may be sandwiched.
Further, as shown in FIG. 13, in the case where the speaker 5 is disposed on the side of the housing 1, a groove 65 for inserting the peripheral portion of the speaker 5 is formed between the body 10 and the peripheral wall of the cover 20. A configuration in which the speaker 5 is inserted into the groove 65 via the packing 66 is also considered.
[0004]
In the configuration shown in FIG. 12 and the configuration shown in FIG. 13, the speaker 5 is fixed by compressing the packings 63, 64, 66 when the body 10 and the cover 20 are connected.
[0005]
[Problems to be solved by the invention]
In the speaker fixing structure as described above, members exclusively used for fixing the speaker 5, such as the holding metal 61 and the fixing screw 62 or the packings 63, 64, and 66, are required. There is a problem that the assembly work becomes troublesome.
[0006]
The present invention has been made in view of the above circumstances, and an object of the present invention is to fix a speaker to a housing without using other members, thereby providing a speaker fixing structure with a small number of parts and easy assembly work. To provide.
[0007]
[Means for Solving the Problems]
According to the first aspect of the present invention, in order to achieve the above object, a speaker is fixed in a housing formed by a box-shaped body having an open front surface and a cover coupled to an opening side of the body. The loudspeaker includes a cylindrical head section in which a conversion mechanism for converting an electric signal into mechanical vibration is housed, and a frame section formed in a shape expanding from the head section and holding a cone, and receives the head section. among the first attachment protrusion which can be circular receiving groove resiliently clamping the central portion of the frame portion between the inner surface of the peripheral wall of the body is formed in a tip of the rear wall of the body projecting from the side, it is the second attachment protrusion which can be resiliently clamped between the inner surface of the cover the peripheral portion of the frame portion is protruded on the inner face of the front wall of the cover .
[0008]
According to this configuration, the center and the periphery of the frame portion of the speaker can be held by the body and the cover, respectively, by utilizing the elasticity of the mounting projection integrally provided on the housing. parts not be required less and a speaker only assembling work easily ing because it is possible to fix the speaker in inserting a predetermined portion of the body and the cover.
[0009]
According to a second aspect of the present invention, in the first aspect of the present invention, when the cover is coupled to the body, a portion of each of the peripheral walls of the body and the cover that sandwiches the frame between at least the first mounting projections is provided. And a pressing surface inclined to bend the peripheral wall of the body toward the first mounting projection.
In this configuration, when the body and the cover are joined together, the peripheral wall of the body is pressed against the speaker, so that the speaker can be more firmly held. The mounting projections and the mounting projections are in close contact with the speaker, and so-called chattering noise can be prevented.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
1 to 10 show an embodiment of the present invention. In the present embodiment, a speaker fixing structure in the master unit X of the door phone system as shown in FIG. 10 is illustrated. However, the following embodiments do not limit the application of the present invention, and the technical idea of the present invention can be applied to any electric device having a speaker built in a housing.
[0011]
The intercom system is configured by connecting a slave Y to a master X via a signal line Ls, and commercial power is supplied to the master X via a power line Lp. The slave Y includes a TV camera Ya, a microphone Yb for talking, and a speaker Yc, and is supplied with power from the master X via a signal line Ls. Here, between the parent device X and the child device Y, it is necessary to transmit the audio signal and the video signal and supply the power, so that the audio signal and the video signal are modulated so as to occupy different frequency bands. This type of technology is well known, and can transmit audio signals and video signals and supply power using a two-wire signal line Ls.
[0012]
The housing 1 of the parent device X includes a box-shaped body 10 having a front opening (the left side in FIG. 1) and a box-shaped cover 20 having a rear opening. The body 10 is connected to the boss 10a by an assembling screw 19 which is inserted into the boss 10a from the rear surface and is screwed to the boss 20a projecting from the inner surface of the cover 20. A rectangular display window 21 is opened at an upper portion of the cover 20, and a filter mounting recess 21 a recessed from other portions is formed around the display window 21 on the front surface of the cover 20. Engagement holes 21b for engaging projections provided on both sides of the filter 29 are formed on both sides of the filter mounting recess 21a. The filter 29 has a function of suppressing reflection of a flat CRT 3 on a screen, which will be described later, and protecting the flat CRT 3.
[0013]
Inside the housing 1, a circuit board 2a composed of a flat CRT 3 as a display described in the related art and a printed circuit board on which an electronic circuit including a driving circuit of the flat CRT 3 and a communication circuit for voice communication are mounted. , 2b, 2c. The circuit board 2a is mainly mounted with a circuit portion (power supply circuit, driving circuit of the flat CRT 3, communication circuit), and is arranged along substantially the entire inner surface of the rear wall of the body 10. The circuit board 2b is mounted with a video circuit for displaying an image captured by the TV camera of the slave unit Y on the flat CRT 3, and is arranged along the left peripheral wall of the body 10. Further, the circuit board 2c is mainly provided with the switches 4a and 4b, and is disposed along a part of the inner surface of the front wall of the cover 20.
[0014]
The circuit board 2a is placed on a step 11b formed at the tip of a boss 10a protruding from the inner wall of the rear wall of the body 10 at the position where the assembly screw is inserted. Distance is kept. Further, the lower end edge of the circuit board 2a is locked by a mounting hook 11 protruding from a lower portion (a lower portion in FIG. 1) of an inner surface of the rear wall of the body 10, and an upper portion of the inner surface of the rear wall of the body 10 is formed. The fixing protrusion 12 protruding from the fixing notch 31 is inserted into a fixing notch 31 formed on the upper portion of the circuit board 2a, and a locking claw 12a formed at an intermediate portion of the lower surface of the fixing protrusion 12 is engaged with a peripheral edge of the fixing notch 31. The stop prevents the circuit board 2a from rising from the rear wall of the body 10. That is, the circuit board 2a is fixed to the rear wall of the body 10 by the boss 10a, the mounting hook 11, and the fixing protrusion 12 while maintaining a certain distance.
[0015]
Further, the position of the circuit board 2a in the left-right direction is fixed by engaging with the boss 10a, and a part of the circuit board 2a is sandwiched between the mounting hook 11 and the fixing protrusion 12 so as to be vertically fixed. The position is fixed. Here, the fixing projection 12 has flexibility so that the distance of the locking claw 12a from the mounting hook 11 is variable, and the fixing notch 31 formed on the circuit board 2a is Is formed to a width that can bend to such an extent that the engagement state is released. That is, the vertical width of the fixing notch 31 is set to be larger than the vertical width of a portion of the fixing protrusion 12 including the tip of the locking claw 12a. In addition, a part of the lower surface on the distal end side of the fixed protrusion 12 is inclined so as to increase the distance from the distal end toward the base, and the step formed at the lower end of the inclined portion functions as the locking claw 12a. Therefore, after the lower edge of the circuit board 2a is locked to the mounting hook 11, the fixing protrusion 12 is inserted into the fixing notch 31 to press the circuit board 2a against the rear wall of the body 10, so that the circuit board 2a is It can be fixed to the body 10 by the mounting hook 11 and the fixing protrusion 12.
[0016]
The circuit board 2b is sandwiched between a holding rib 13a provided on the left side wall of the body 10 and a holding rib 13b projecting from the rear wall of the body 10 at a distance from the holding rib 13a. Fixed to.
The circuit board 2 c is locked by a boss 23 formed on the inner surface of the cover 20 while the peripheral portion is locked by a receiving portion 22 d provided at the tip of a stopper piece 22 a formed on the inner surface of the front wall of the cover 20. It is fixed to the cover 20 by using a tapping screw (not shown) that is screwed through the circuit board 2c. The receiving portion 22d is formed in an L-shaped cross section and locks a part of the circuit board 2c between the horizontal piece and the stopper piece 22a. On the circuit board 2c, a switch 4a for activating a monitor, a switch 4b for instructing start and end of a call, and a display lamp (not shown) for indicating that a call is in progress are mounted. The operation button 4c of the switch 4a is exposed on the front right side of the housing 1. Each time the operation button 4c is pressed, an image captured by the TV camera of the slave unit Y is not displayed on the screen of the flat CRT 3 Select the state and. Further, a switch handle 24 serving as an operation unit of the switch 4b is disposed at a lower portion of the front surface of the housing 1, and each time the switch handle 24 is pressed, a call state and a non-call state are selected. In addition, the above-described display lamp is disposed on the back side of the switch handle 24, and during a call, the display lamp is turned on to illuminate the display mark 24a formed as a light-transmitting portion on a part of the switch handle 24. ing.
[0017]
The switch handle 24 is inserted into a handle window 25 formed at a lower portion of the front surface of the cover 20, and stopper pieces 22 a to 22 c extend from key points on the periphery of the handle window 25 on the rear surface of the front wall of the cover 20. ing. The stopper pieces 22a and 22b extending on the upper side of the handle window 25 have a function of positioning the pivot portion of the switch handle 24. The stopper pieces 22a and 22c extending on the lower side of the handle window 25 are It has a function of regulating the amount of pushing of the switch handle 24. Here, the stopper piece 22a is formed so as to be continuous from the upper portion to the lower portion of the handle window 25 in order to provide the receiving portion 22d described above. On the upper edge of the switch handle 24, a pair of spring pieces 24b curved so as to protrude rearward is formed, and a stop piece 24c is formed adjacent to each spring piece 24b. Thus, by positioning a part of the stopper pieces 22a and 22b between the spring piece 24b and the stopper piece 24c, the position of the switch handle 24 is regulated so that the switch handle 24 does not rattle left and right. By contacting the portion with the rear surface of the front wall of the cover 20, the lower portion of the switch handle 24 can be biased forward. On the lower rear surface of the switch handle 24, a retaining piece 24d is formed which is locked to the lower edge of the handle window 25 in order to restrict the forward movement of the switch handle 24.
[0018]
By the way, a flat CRT 3 as a display is provided in the housing 1 for displaying an image picked up by the slave Y. The bulb of the flat CRT 3 includes a neck portion 3a in which an electron gun is housed, and a face portion 3b having a screen along a direction in which electrons are emitted from the electron gun (that is, an axial direction of the neck portion 3a). Here, the face portion 3b has a flat front wall, and the rear wall is formed in a curved shape so as to approach the front wall as the distance from the neck portion 3a increases, and a fluorescent material is applied to the inner surface of the rear wall. . The neck 3a is provided to protrude from a part of the face 3b.
[0019]
The flat CRT 3 is fixed at a fixed position in the housing 1 by the following configuration. That is, the above-mentioned fixed projections 12 are provided in a pair so as to protrude from the side surface and the rear surface of the face portion 3b of the flat cathode ray tube 3, and the tip of each of the fixed projections 12 is provided on each side surface of the flat cathode ray tube 3. A holding notch 12b conforming to the shape of a portion extending from the rear surface to the rear surface is formed. Further, a pair of holding projections 14 are provided at other portions of the rear wall of the body 10 so as to extend from each side surface of the face portion 3b to the back surface. Similarly, a holding notch 14a having a shape matching the shape of a portion extending from each side surface to the back surface of the face portion 3b is formed. Therefore, the flat CRT 3 is positioned by the fixed protrusion 12 and the holding protrusion 14 so as not to move in the left-right direction.
[0020]
Further, a pair of positioning projections 15 are provided on the rear wall of the body 10 so as to abut on the peripheral surface of the face portion 3b on the side of the neck portion 3a (that is, the lower surface of the face portion 3b) on both sides of the neck portion 3a. In addition, a pair of support protrusions 16 that can be in contact with the upper portion of the back surface of the face portion 3b are also provided on the rear wall of the body 10. Therefore, the positioning projection 15 and the support projection 16 prevent the flat CRT 3 from moving in the vertical direction.
[0021]
In addition, holding ribs 26 are provided at a plurality of locations on the inner surface of the front wall of the cover 20 so as to surround the periphery of the face portion 3b, so that the movement of the face portion 3b is more reliably restricted. The front surface of the face portion 3b is in contact with the inner surface of the front wall of the cover 20, and the face portion 3b is sandwiched between the fixing protrusion 12 and the holding protrusion 14, thereby restricting the movement of the flat CRT 3 in the front-rear direction. Is done.
[0022]
Incidentally, a microphone (not shown) and a speaker 5 are also provided in the housing 1 for communication with the slave unit Y. The microphone is arranged on the left side of the middle part in the vertical direction of the housing 1, is pressed into a cylindrical holding cylinder 28 protruding from the inner surface of the front wall of the cover 20, and is inserted into the rear wall of the body 10. The tip of the retaining rib 17 protruding from the side surface is held in the housing 1 by abutting on the rear surface of the microphone. Further, a through hole 28a for allowing sound waves to enter the microphone is formed in a portion of the front wall of the cover 20 surrounded by the holding cylinder 28.
[0023]
On the other hand, a general dynamic cone speaker is used as the speaker 5, and a cylindrical head portion 5a containing a conversion mechanism for converting an electric signal into mechanical vibration using an electromagnet, and the speaker 5 is expanded from the head portion 5a. And a frame portion 5b formed in a shape to hold the cone. Here, the head part 5a and the frame part 5b are formed of metal. The speaker 5 is housed in the lower part of the housing 1, and a number of sound output holes 18 are formed in the lower wall of the housing 1 to take out the sound from the speaker 5 to the outside of the housing 1. I have.
[0024]
By the way, a mounting protruding piece 32 capable of holding the frame portion 5b of the speaker 5 between the lower wall and the rear wall of the body 10 protrudes. A semicircular receiving groove 32a for receiving the head portion 5a is formed at the tip of the mounting projection 32. Further, a push piece 32b protruding toward the lower wall of the body 10 is provided on one side of the mounting protrusion 32. The mounting projection 32 has flexibility, and the distance between the pressing piece 32b and the lower wall of the body 10 is set to be slightly smaller than the thickness dimension of the central part of the frame 5b of the speaker 5. Therefore, the speaker 5 is fixed to the body 10 by the frame portion 5b of the speaker 5 being elastically sandwiched between the mounting projection 32 and the lower wall of the body 10.
[0025]
Further, a mounting protruding piece 33 is provided on the front wall of the cover 20 so as to hold the peripheral portion of the frame portion 5b of the speaker 5 between the front wall and the lower wall. The mounting projection 33 also has flexibility, and the distance between the lower wall of the cover 20 and the mounting projection 33 is set slightly smaller than the thickness of the peripheral portion of the frame 5 b of the speaker 5. Therefore, the loudspeaker 5 is fixed to the cover 20 by the elasticity of the peripheral portion of the frame 5b of the loudspeaker 5 between the mounting projection 33 and the lower wall of the cover 20.
[0026]
In addition, an inclined pressing surface 34 is formed at the leading edge of the peripheral wall of the body 10 so that the peripheral wall of the body 10 can be bent toward the mounting projection 32 when the cover 20 is coupled to the body 10. I have. Therefore, when the cover 20 is joined to the body 10, the frame 5b of the speaker 5 is more firmly fixed by bending the peripheral wall of the body 10 in a direction to shorten the distance from the mounting projection 32, and as a result, 5 and the housing 1 can be brought into close contact with each other. Here, when the speaker 5 is not in close contact with the housing 1, a so-called chatter sound is generated. However, the chatter sound is prevented from being generated by the close contact of the speaker 5 with the housing 1 as described above. FIG. 9 shows a main part of a structure for fixing the speaker 5 to the housing 1.
[0027]
As described above, since the speaker 5 is fixed by using the member formed integrally with the body 10 and the cover 20, there is no need to use a separate member when fixing the speaker 5, and furthermore, the vibration reduction Since chattering noise can be prevented without using a separate member, it is not necessary to use a separate part when mounting the speaker 5, and as a result, the number of parts is reduced and the assembling work is facilitated.
[0028]
By the way, a knob 41b for operating a slide switch 41a for adjusting the brightness of the flat CRT 3 and a knob 42b for operating a slide switch 42a for adjusting the volume are exposed on the lower surface of the housing 1.
On the rear side of the housing 1, a terminal block 43 for connecting a power supply line and a terminal block 44 for connecting a slave unit Y and an external speaker are arranged. The terminal block 43 is inserted into a rectangular cylindrical terminal holding cylinder 45 formed on the rear wall of the body 10. The terminal holding cylinder 45 has a part protruding toward the rear surface of the body 10 and a notch 45a on one side surface of the protruding portion. A step portion 45b is formed inside the rear portion of the terminal holding tube 45 to restrict the rearward movement of the terminal block 43. The front end edge of the terminal holding tube 45 projects forward and extends forward of the terminal block 43. A locking hook 45c for restricting movement is protruded. Here, the terminal block 45 is one in which a quick-connecting terminal for holding an electric wire using the spring force of a locking spring is provided in a case, and the terminal block 45 is positioned by a step portion 45b and a locking hook 45c. It is inserted into the holding cylinder 45. In this state, the wire insertion hole 43a provided in the case is exposed from the notch 45a. That is, the power supply line is laid along the rear surface of the body 10. A concave portion 46 is formed on the rear surface of the body 10, and the rear end of the terminal holding cylinder 45 substantially coincides with the rear surface of the rear surface of the body 10 where the concave portion 46 is not formed. Further, an L-shaped tension stopper 47 is protrudingly provided in the concave portion 46 so as to suppress the action of tension on a connection portion between the terminal block 43 and the power supply line.
[0029]
A mounting bracket 50 is used to mount the housing 1 on a mounting surface such as a wall surface. The mounting bracket 50 is formed in a shape in which a pair of hooking pieces 51 are protrudingly provided on both side edges, and is used when mounting a mounting screw 52 through which a wood screw used for directly attaching to a wall surface or an embedded wiring device is installed. A mounting hole 53 through which a screw for fixing to a switch box is inserted, and a mounting hole 54 for mounting a clamp for clamping a peripheral portion of a mounting hole formed in a plate material such as a wall panel with the mounting bracket 50. Are provided. The hook 51 of the mounting bracket 50 engages with the hook 48 formed on the side wall of the recess 46 by sliding the housing 1 relative to the mounting bracket 50. By fixing the housing 1 to the construction surface, the mounting bracket 50 can be used to fix the housing 1 to the construction surface.
[0030]
【The invention's effect】
The invention according to claim 1 is a structure in which a speaker is fixed in a housing formed by a box-shaped body having an open surface and a cover coupled to the opening side of the body, wherein the speaker transmits an electric signal to a machine. A semi-circular receiving groove that receives the head is provided with a cylindrical head that houses a conversion mechanism that converts vibration, and a frame that is formed in a shape that expands from the head and holds the cone. And a first mounting protrusion protruding from the inner surface of the rear wall of the body, the first mounting protrusion being capable of elastically holding the central portion of the frame portion with the inner surface of the peripheral wall of the body. A second mounting projection is provided on the inner surface of the front wall of the cover so that the peripheral portion of the cover can be elastically clamped between the inner surface of the cover and the second mounting projection. by utilizing the elasticity of the mounting protrusion speaker Since the central portion and the peripheral portion of the frame portion can be held respectively in the body and the cover, there is an advantage that a small number of parts there is no need to other members, and predetermined portion of the body and cover the speaker advantage that assembling work because it is possible to fix the speaker simply inserted is facilitated there Ru.
[0031]
According to the second aspect of the present invention, at least a portion of the peripheral wall of the body and the cover that sandwiches the frame portion between the first mounting projection and the first mounting projection piece has the peripheral wall of the body when the cover is coupled to the body. Since the pressing surface is formed so as to bend toward the mounting projection of the body, the peripheral wall of the body is pressed against the speaker when the body and the cover are combined, so that the speaker is more firmly held. In addition, by elastically holding the speaker, there is an advantage that the peripheral wall of the body and the mounting projections come into close contact with the speaker, and so-called chattering noise can be prevented.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an embodiment.
FIG. 2 is a front view of the embodiment.
FIG. 3 is a rear view of the embodiment.
FIG. 4 is a partially broken bottom view of the embodiment.
FIG. 5 is a front view of the embodiment with a cover removed.
FIG. 6 is a rear view of a cover used in the embodiment.
FIG. 7 is a sectional view of the embodiment.
FIG. 8 is a sectional view of the embodiment.
9A and 9B show a main part of the embodiment, in which FIG. 9A is a longitudinal sectional view, and FIG. 9B is a transverse sectional view.
FIG. 10 is a diagram showing a configuration example in which the embodiment is used for a door phone system.
FIG. 11 is a sectional view showing a conventional example.
FIG. 12 is a sectional view showing a conventional example.
FIG. 13 is a sectional view showing a conventional example.
[Explanation of symbols]
Reference Signs List 1 housing 5 speaker 5a head 5b frame 10 body 20 cover 32 mounting projection 32a receiving groove 33 mounting projection 34 pressing surface

Claims (2)

A structure in which a speaker is fixed in a housing formed by a box-shaped body having an open front surface and a cover coupled to the opening side of the body. The speaker has a conversion mechanism that converts an electric signal into mechanical vibration. A semi-circular receiving groove for receiving the head portion is formed at the distal end portion of the body, and includes a cylindrical head portion housed therein, and a frame portion formed in a shape expanding from the head portion and holding a cone. A first mounting projection is provided on the inner surface of the rear wall of the body so as to elastically hold the central portion of the frame between the inner surface of the peripheral wall and the inner surface of the frame. A speaker fixing structure, characterized in that a second mounting projection that can be elastically held between the side and the side is projected from an inner surface of a front wall of the cover. At least a portion of the peripheral wall of the body and the cover that sandwiches the frame portion between the first mounting protrusion and the peripheral wall of the body faces the first mounting protrusion when the cover is coupled to the body. The speaker fixing structure according to claim 1, wherein an inclined pressing surface is formed so as to bend.

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