JPH09149484A - Speaker fixing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a speaker fixing structure reducing the number of component points and facilitating assembling work by fixing a speaker to a housing without using other components. SOLUTION: The housing 1 is formed by a box-like body 10 opening its front face and a cover 20 connected to the back wall of the body 10. A fitting projecting piece 32 holding the frame part 5b of the speaker 5 between with a peripheral wall is projectingly provided at the back wall of the body 10. In addition a fitting projecting piece 33 holding the peripheral part of the frame part 5b of the speaker 5 between with the peripheral wall is projectingly provided at the front wall of the cover 20. A receiving groove receiving the head part 5a of the speaker 5 is formed at the tip edge of the fitting projecting piece 32, which elastically inserts and holds the frame part 5b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker fixing structure for fixing a speaker inside a housing.

[0002]

2. Description of the Related Art Generally, in an intercom system, since a telephone call is made between a child device arranged at a front door or the like and a parent device arranged indoors, a speaker is built in a housing of the parent device or the child device. As a technique for fixing this type of speaker to the housing, for example, there is one 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 side of the body 10, and the speaker 5 is covered by the cover 2.
In many cases, it is attached in close contact with the inner surface of the front wall of 0. In the example shown in FIG. 11, a pressing metal fitting 61 is arranged on the back surface side of the speaker 5, and the peripheral portion of the pressing metal fitting 61 is covered by the cover 20.
It is fixed by a fixing screw 62 that is screwed into.

Further, 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. There is also a configuration in which the speaker 5 is sandwiched by. Further, as shown in FIG. 13, in the case where the speaker 5 is arranged on the side portion 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.

In the configuration shown in FIG. 12 and the configuration shown in FIG. 13, the speaker 5 is compressed by compressing the packings 63, 64, 66 when the body 10 and the cover 20 are joined.
Is fixed.

[0005]

In the speaker fixing structure as described above, the speaker 5 is provided with the pressing metal fitting 61 and the fixing screw 62 or the packings 63, 64, 66.
However, there is a problem that the number of parts is increased and the assembling work is complicated.

The present invention has been made in view of the above circumstances, and an object thereof is to fix a speaker to a housing without using other members, thereby reducing the number of parts.
Another object of the present invention is to provide a speaker fixing structure that is easy to assemble.

[0007]

In order to achieve the above object, according to the invention of claim 1, the inside of a housing is formed by a box-shaped body having an opening on the front surface and a cover connected to the opening side of the body. A structure for fixing the speaker to
The speaker includes a cylindrical head portion that accommodates a conversion mechanism that converts an electric signal into mechanical vibration, and a frame portion that is formed to expand from the head portion and that holds a cone.
A semi-circular receiving groove for receiving the head portion is formed at the tip portion, and a first mounting projection that elastically clamps the frame portion between the inner surface of the peripheral wall of the body and the inner surface of the rear wall of the body is provided. The second mounting projection, which is projectingly provided and elastically clamps the peripheral portion of the frame portion to the inner side surface of the cover, is projectingly provided on the inner side surface of the front wall of the cover.

According to this structure, since the speaker can be held by utilizing the elasticity of the mounting protrusion provided integrally with the housing, other members are unnecessary, the number of parts is small, and the speaker is mounted on the body. The speaker can be fixed simply by inserting it into a predetermined position of the cover or the cover, which facilitates the assembling work. Moreover, since the speaker is sandwiched between the peripheral walls of the body and the cover and the mounting protrusions provided on the body and the cover, the speaker can be mounted on either the body or the cover even when the body and the cover are separated. Since it is temporarily fixed to this, the assembling work becomes easy also in this respect.

According to a second aspect of the invention, in the first aspect of the invention, at least the first of the peripheral walls of the body and the cover is provided.
A pressing surface that is inclined so as to bend the peripheral wall of the body toward the first mounting projection when the cover is joined to the body is formed in a portion that sandwiches the frame portion with the mounting projection. It is characterized by being formed. With this configuration, when the body and the cover are joined, the peripheral wall of the body is pressed against the speaker, so that the speaker can be more firmly held, and by elastically holding the speaker, the peripheral wall of the body can be held. It is possible to prevent the so-called chatter sound from being generated by the attachment protrusions being in close contact with the speaker.

[0010]

1 to 10 show an embodiment of the present invention. In the present embodiment, a speaker fixing structure in the master device X of the doorphone system as shown in FIG. 10 is exemplified. 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 in which a speaker is built in a housing.

In the intercom system, the master unit X is connected to the signal line Ls.
It is configured by connecting a slave device Y via a master device X
Is supplied with commercial power from a power line Lp. A TV camera Ya and a microphone Y for communication are included in the child device Y.
b and the speaker Yc are built in, and power is supplied from the master device X via the signal line Ls. Here, parent device X and child device Y
Since it is necessary to transmit an audio signal and a video signal and supply power between them, the audio signal and the video signal are modulated so as to occupy different frequency bands. This kind of technology is well known, and it is possible to transmit an audio signal and a video signal and supply power by using a two-wire type signal line Ls.

The housing 1 of the master unit X comprises a box-shaped body 10 which is a synthetic resin molded product and which has an open front surface (left side in FIG. 1) and a box-shaped cover 20 which has an open rear surface. The body 20 is connected to the boss 10a from the rear surface of the body 10 by an assembly screw 19 which is screwed to the boss 20a protruding from the inner surface of the cover 20. A rectangular display window 21 is opened in the upper portion of the cover 20, and a filter mounting recess 21a recessed from other portions is formed in the peripheral portion of the display window 21 on the front surface of the cover 20. Filters 29 are provided on both sides of the filter mounting recess 21a.
Engaging holes 21b are formed to engage the protrusions provided on both sides. The filter 29 has a function of suppressing reflection of the flat cathode ray tube 3 which will be described later on the screen and protecting the flat cathode ray tube 3.

In the housing 1, a flat cathode ray tube 3 as a display described as a conventional technique and a printed circuit board on which an electronic circuit including a drive circuit of the flat cathode ray tube 3 and a call circuit for voice communication are mounted. Circuit board 2
a, 2b, and 2c are installed. The circuit board 2a is mainly a circuit part (power supply circuit, drive circuit for the flat cathode ray tube 3,
A communication circuit) is mounted and arranged so as to extend along substantially the entire inner surface of the rear wall of the body 10. Further, the circuit board 2b is mainly provided with a video circuit for displaying an image captured by the TV camera of the child device Y on the flat cathode ray tube 3, and is arranged along the peripheral wall on the left side of the body 10. Further, the circuit board 2c is mainly mounted with the switches 4a and 4b,
It is arranged along a part of the inner surface of the front wall of the cover 20.

The circuit board 2a is provided with a boss 10a protruding from the inner surface of the rear wall of the body 10 at the position where the assembly screw is inserted.
The distance from the rear wall of the body 10 is maintained by being mounted on the stepped portion 11b formed at the tip of the body 10. Also,
Lower part of the inner surface of the rear wall of the body 10 (lower part in FIG. 1)
The lower end edge of the circuit board 2a is locked to the mounting hook 11 projectingly provided on the circuit board 2a, and the fixing projection 12 projecting from the upper portion of the inner surface of the rear wall of the body 10 is formed on the upper portion of the circuit board 2a. The locking claw 12a that is inserted through the fixing notch 31 and formed in the middle portion of the lower surface of the fixing protrusion 12 is locked to the peripheral edge of the fixing notch 31, so that the body 1 of the circuit board 2a is
0 is prevented from rising from the rear wall. That is,
The circuit board 2a is fixed to the rear wall of the body 10 by the boss 10a, the mounting hooks 11 and the fixing protrusions 12 while keeping a constant distance.

The circuit board 2a is fixed in the left-right direction by engaging with the boss 10a, and the circuit board 2 is provided between the mounting hook 11 and the fixing projection 12.
By sandwiching a part of a, the position is fixed in the vertical direction. Here, the fixing projection 12 is flexible 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 has the locking claw 12a on the circuit board 2a. The width is such that it can be bent to the extent that the engagement state with is released. That is, the vertical width of the fixing notch 31 is set to be larger than the vertical width of the portion of the fixing projection 12 including the tip of the locking claw 12a. Further, a part of the lower surface on the tip side of the fixing projection 12 is inclined so as to widen the distance from the tip to 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 notch 31
The circuit board 2a can be fixed to the body 10 by the mounting hooks 11 and the fixing projections 12 by inserting the fixing projections 12 into and pressing the circuit board 2a against the rear wall of the body 10.

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 provided on the rear wall of the body 10 so as to be separated from the holding rib 13a. It is fixed to the body 10 by. The circuit board 2c has a peripheral portion locked to a receiving portion 22d provided at a tip end portion of a stopper piece 22a formed on the inner surface of the front wall of the cover 20, and a boss 23 formed on the inner surface of the cover 20. It is fixed to the cover 20 by using a tapping screw (not shown) screwed through the circuit board 2c.
The receiving portion 22d is formed in an L-shaped cross section, and has a horizontal piece and a stopper piece 2
A part of the circuit board 2c is locked with the 2a. A switch 4a for starting a monitor, a switch 4b for instructing the start and end of a call, and a display lamp (not shown) for indicating that a call is in progress are mounted on the circuit board 2c.
The operation button 4c of the switch 4a is exposed on the right side of the front surface of the housing 1, and each time the operation button 4c is pressed, the TV of the child device Y is operated.
The state in which the image captured by the camera is displayed on the screen of the flat cathode ray tube 3 and the state in which it is not displayed are selected. Also,
A switch handle 24, which serves as an operating portion of the switch 4b, is arranged on the lower portion of the front surface of the housing 1, and each time the switch handle 24 is pressed, a talking state or a non-talking state is selected. Further, the above-mentioned display lamp is arranged on the back side of the switch handle 24, and during communication, 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.

The switch handle 24 is inserted into a handle window 25 formed in a lower portion of the front surface of the cover 20, and stopper pieces 22a to 22c are provided on the rear surface of the front wall of the cover 20 from a peripheral portion of the handle window 25. It has been extended. Stopper piece 22 extended to the upper side of the handle window 25
a and 22b have a function of positioning the pivotal support portion of the switch handle 24, and stopper pieces 22a and 22c extending to the lower side of the handle window 25 are switch handle 24.
It has a function to regulate the pushing amount. 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 above-mentioned receiving portion 22d. A pair of spring pieces 24b curved so as to be convex toward the rear surface is formed on the upper edge of the switch handle 24, and a stop piece 24c is formed adjacent to each spring piece 24b. Then, by locating a part of the stopper pieces 22a and 22b between the spring piece 24b and the stopper piece 24c, the switch handle 24 is regulated in position so that it does not rattle to the left and right, and the tip of the spring piece 24b. By bringing the portion into contact 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 rear surface of the lower portion of the switch handle 24, a handle window 25 is provided to restrict forward movement of the switch handle 24.
A retaining piece 24d that is locked to the lower edge of the bottom is formed.

By the way, in order to display the image picked up by the child device Y, the flat cathode ray tube 3 as a display is housed in the housing 1. The bulb of the flat cathode ray tube 3 includes a neck portion 3a in which an electron gun is mounted, and a face portion 3b having a screen along the emission direction of electrons from the electron gun (that is, the axial direction of the neck portion 3a). Here, in the face portion 3b, the front wall has a flat plate shape, and the rear wall has the neck portion 3a.
It is formed in a curved shape so as to come closer to the front wall as it goes away from, and a fluorescent substance is applied to the inner surface of the rear wall.
The neck portion 3a is provided so as to project from a part of the face portion 3b.

The flat cathode ray tube 3 is fixed at a fixed position in the housing 1 by the following structure. That is, the above-mentioned fixed projections 12 are provided in a pair so as to project on the side surface and the rear surface of the face portion 3b of the flat cathode ray tube 3, and the tip end of each fixed projection 12 has a side surface of the flat cathode ray tube 3 respectively. The holding notch 12b is formed in conformity with the shape of the portion extending from the to the rear surface. In addition, a pair of holding projections 14 are provided on the other portion of the rear wall of the body 10 at a portion extending from each side surface to the back surface of the face portion 3b. Similarly, a holding notch 14a having a shape matching the shape of a portion extending from each side surface of the face portion 3b to the back surface is formed. Therefore, the fixed protrusion 1
The flat cathode ray tube 3 is positioned by the 2 and the holding projections 14 so as not to move in the left-right direction.

Further, on the rear wall of the body 10, a pair of positioning projections 15 are provided which abut on both sides of the neck portion 3a on the peripheral surface of the face portion 3b on the neck portion 3a side (that is, the lower surface of the face portion 3b). ing. Also, the body 10
The rear wall is also provided with a pair of support protrusions 16 that can come into contact with the upper portion of the back surface of the face portion 3b. Therefore, the positioning projection 15 and the support projection 16 prevent the flat cathode ray tube 3 from moving in the vertical direction.

In addition, on the inner surface of the front wall of the cover 20, holding ribs 2 are provided at a plurality of positions so as to surround the periphery of the face portion 3b.
6 is provided so that the face portion 3b is regulated to move more reliably. Further, the inner surface of the front wall of the cover 20 abuts on the front surface of the face portion 3b, and the face portion 3b is sandwiched between the fixed protrusion 12 and the holding protrusion 14, whereby the movement of the flat cathode ray tube 3 in the front-rear direction is restricted. To be done.

By the way, a microphone (not shown) and a speaker 5 are provided in the housing 1 for communication with the child device Y.
Have also been delivered. The microphone is arranged on the left side of the vertical middle part of the housing 1, is press-fitted into a cylindrical holding cylinder 28 protruding from the inner side surface of the front wall of the cover 20, and is inside the rear wall of the body 10. The tip of the retaining rib 17 provided on the side surface is held in the housing 1 by contacting the rear surface of the microphone. Also, the cover 20
A through hole 28a for allowing a sound wave to enter the microphone is formed in a portion of the front wall surrounded by the holding cylinder 28.

On the other hand, a general dynamic cone speaker is used for the speaker 5, and a cylindrical head portion 5a in which a conversion mechanism for converting an electric signal into a mechanical vibration is installed by using an electromagnet, and a head portion 5a. And a frame portion 5b that holds the cone and that is formed in a shape that expands from. Here, the head portion 5a and the frame portion 5b are made of metal. The speaker 5 is installed in the lower part of the housing 1, and a large number of sound output holes 18 are formed in the lower wall of the housing 1 to extract the sound from the speaker 5 to the outside of the housing 1. There is.

By the way, the rear wall of the body 10 is provided with a mounting projection 32 capable of sandwiching the frame portion 5b of the speaker 5 with the lower wall. A semicircular receiving groove 32a for receiving the head portion 5a is provided at the tip of the mounting projection 32.
Are formed. Further, a push piece 32b protruding toward the lower wall of the body 10 is provided on one side of the mounting projection 32. The mounting protrusion 32 is flexible and has a pushing piece 32b.
And the lower wall of the body 10 are set to be slightly smaller than the thickness dimension of the central portion of the frame portion 5b of the speaker 5. Therefore, the frame portion 5b of the speaker 5 is elastically sandwiched between the mounting projection 32 and the lower wall of the body 10, so that the speaker 5 is fixed to the body 10.

Further, a mounting projection 33 is provided on the front wall of the cover 20 so as to sandwich the peripheral portion of the frame portion 5b of the speaker 5 with the lower wall. This mounting protrusion 3
3 is also flexible, and the distance between the lower wall of the cover 20 and the mounting projection 33 is set to be slightly smaller than the thickness dimension of the peripheral portion of the frame portion 5b of the speaker 5. Therefore, the peripheral portion of the frame portion 5b of the speaker 5 is attached to the mounting projection 33 and the cover 2.
The speaker 5 is fixed to the cover 20 by being elastically sandwiched between it and the lower wall of the speaker 0.

In addition, an inclined pressing surface 34 is formed at the tip 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 joined to the body 10. Has been formed. Therefore, when the cover 20 is coupled to the body 10, the peripheral wall of the body 10 bends in a direction to reduce the distance from the mounting projection 32, so that the frame portion 5b of the speaker 5 is more firmly fixed, and as a result, the speaker is 5 and the housing 1 can be brought into close contact with each other. When the speaker 5 is not in close contact with the housing 1, so-called chattering sound is generated. However, since the speaker 5 is in close contact with the housing 1 as described above, generation of chattering sound is prevented. FIG. 9 shows a main part of a structure for fixing the speaker 5 to the housing 1.

As described above, the speaker 5 is formed by using the members formed integrally with the body 10 and the cover 20.
Since the speaker 5 is fixed, it is not necessary to use a separate member for fixing the speaker 5, and the chattering noise can be prevented without separately using an anti-vibration member. There is no need to use separate parts for mounting, the number of parts is small and the assembly work is easy.

By the way, a knob 41b for operating the slide switch 41a for adjusting the brightness of the flat cathode-ray tube 3 and a knob 42b for operating the slide switch 42a for adjusting the volume are exposed on the lower surface of the housing 1. Further, a terminal block 43 for connecting a power supply line and a terminal block 44 for connecting a slave Y and an external speaker are arranged on the rear surface side of the housing 1. The terminal block 43 is inserted into and attached to a terminal holding cylinder 45 having a rectangular tube shape formed on the rear wall of the body 10. A part of the terminal holding cylinder 45 protrudes to the rear surface side of the body 10, and has a notch 45a on one side surface of the protruding portion. Inside the rear portion of the terminal holding cylinder 45, a step portion 45b that restricts the rearward movement of the terminal block 43 is provided.
Further, a locking hook 45c that protrudes forward and restricts the forward movement of the terminal block 43 is provided at the front end edge of the terminal holding cylinder 45. The terminal block 45 is a case in which a quick-connect terminal for holding an electric wire by using the spring force of a locking spring is installed in a case, and the terminal block 45 is positioned by the step portion 45b and the 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 cutout 45a. That is, the power supply line is wired 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 provided in the recess 46 so as to suppress the action of tension on the connection portion between the terminal block 43 and the power supply line.

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 provided on both side edges so as to project, and a mounting hole 52 for inserting a wood screw used when directly mounting on a wall surface.
Or a mounting hole 53 for inserting a screw for fixing to a switch box used at the time of construction of an embedded wiring device,
A metal fitting mounting hole 54 for mounting a sandwich metal fitting for sandwiching a peripheral portion of a construction hole drilled in a plate material such as a wall panel with the mounting metal fitting 50 is provided. The hook piece 51 of the mounting bracket 50 engages with the hook piece 48 formed on the side wall of the recess 46 by sliding the housing 1 relative to the mounting bracket 50. If it is fixed to the construction surface, the housing 1 can be fixed to the construction surface by using the mounting bracket 50.

[0030]

According to the invention of claim 1, there is provided a structure in which a speaker is fixed in a housing formed by a box-shaped body having an opening on one side and a cover connected to the opening side of the body. A semi-circular shape that receives the head part, including a cylindrical head part that accommodates a conversion mechanism that converts an electric signal into mechanical vibration, and a frame part that is formed to expand from the head part and that holds a cone. A first mounting projection, which has a receiving groove formed at the tip and elastically clamps the frame portion with the inner surface of the peripheral wall of the body, is provided so as to project on the inner surface of the rear wall of the body. A second mounting projection for elastically sandwiching the peripheral portion with the inner surface of the cover is provided on the inner surface of the front wall of the cover so as to project. You can use the elasticity to hold the speaker Therefore, there is an advantage that other members are unnecessary and the number of parts is small, and that the speaker can be fixed only by inserting the speaker into a predetermined portion of the body or the cover, which facilitates the assembling work. is there. In addition, since the speaker is sandwiched between the peripheral walls of the body and the cover and the mounting protrusions provided on the body and the cover, the speaker can be mounted on either the body or the cover even when the body and the cover are separated. Since it is temporarily fixed to this, there is an effect that the assembling work becomes easy also in this respect.

According to the second aspect of the present invention, in the peripheral wall of the body and the cover, at a portion where the frame portion is sandwiched between at least the first mounting protrusion, the peripheral wall of the body when the cover is joined to the body. Since the pressing surface that is inclined so as to bend the body toward the first mounting protrusion is formed, the peripheral wall of the body is pressed against the speaker when the body and the cover are combined, so that the speaker is further improved. It is possible to firmly hold the speaker, and by elastically holding the speaker, there is an advantage that the peripheral wall of the body and the mounting projection are brought into close contact with the speaker, and so-called chatter noise can be prevented from being generated.

[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 cutaway 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 the cover used in the embodiment.

FIG. 7 is a cross-sectional view of an embodiment.

FIG. 8 is a cross-sectional view of the embodiment.

FIG. 9 shows a main part of the embodiment, (a) is a longitudinal sectional view,
(B) is a cross-sectional view.

FIG. 10 is a diagram showing a configuration example in which the embodiment is used in a doorphone 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]

 1 Housing 5 Speaker 5a Head 5b Frame 10 Body 20 Cover 32 Mounting Projection Piece 32a Receiving Groove 33 Mounting Projection Piece 34 Pressing Surface

Claims (2)

[Claims] 1. A structure for fixing a speaker 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, wherein the speaker converts an electric signal into mechanical vibration. It has a cylindrical head part that houses the conversion mechanism for converting, and a frame part that expands from the head part and holds the cone, and a semicircular receiving groove that receives the head part is formed at the tip part. And a first mounting projection for elastically sandwiching the frame portion with the inner surface of the peripheral wall of the body is projected on the inner surface of the rear wall of the body, and the peripheral portion of the frame portion is attached to the inner surface of the cover. A fixing structure for a speaker, characterized in that a second mounting projection that is elastically sandwiched between the second mounting projection and the second mounting projection is provided on the inner surface of the front wall of the cover. 2. The peripheral wall of the body and the cover are attached to at least a portion where the frame is sandwiched between the peripheral wall of the body and the cover, when the cover is coupled to the body. The speaker fixing structure according to claim 1, wherein a pressing surface that is inclined so as to bend toward the protruding piece is formed.