Ceiling speaker device

Abstract

To provide a ceiling speaker device tha can maintain its appearance quality seen from the room side for a long period of time and can output a large volume of sound.SOLUTION: A ceiling speaker device (10) includes: a housing (12) that is formed with a width that allows the housing to pass through a hole (Th) formed in a ceiling board (T), and is passed through the hole (Th) from the room side to be arranged on a back face (Tb) of the ceiling board (T); a decorative panel (32) arranged on a front face (Ta) of the ceiling board (T) such that the ceiling board (T) is sandwiched between the housing (12) and the decorative panel; and an opening cover member (7) attached on the housing (12) and covering an opening (Tk) that is created between the housing (12) and the hole (Th).SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present invention relates to a ceiling speaker device. [Background technology]

[0002] A ceiling speaker device is known in which a housing is passed from the indoor side through a hole formed in a ceiling board and installed on the underside of the ceiling, and is described in Patent Document 1. This ceiling speaker device is attached to the ceiling board by placing the housing on the underside of the ceiling board, which becomes the space under the ceiling, and then pulling up the decorative panel on the indoor side with a spring in the housing to clamp the ceiling board from above and below. The decorative panel covers the hole in the ceiling to make it invisible, and has a sound emission hole that allows sound from the speaker to pass through to the indoor side. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2021-127660 A Summary of the Invention [Problem to be solved by the invention]

[0004] The ceiling speaker device described in Patent Document 1 has a housing inserted longitudinally through a hole in a ceiling board, so the dimension in the short direction (width direction) perpendicular to the longitudinal direction is smaller than the diameter of the hole. Therefore, a pair of approximately arch-shaped openings are formed between the housing installed in the ceiling space and the round hole. In other words, after the ceiling speaker device is installed, the space in the ceiling space and the space inside the room are vertically connected by the openings.

[0005] As a result, over time, dust from the ceiling space falls through the opening and accumulates on the back side of the decorative panel. The accumulated dust may appear as a black discoloration from the inside of the room, so improvement is desired from the viewpoint of appearance quality. Also, sound output from the back side of the speaker unit of the ceiling speaker device into the space above the ceiling may circulate through the opening into the room. As a result, the circulating sound may interfere with the sound output from the front side of the speaker unit into the room, reducing the volume, and there is room for improvement.

[0006] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a ceiling speaker device that maintains its appearance quality from the inside of a room for a long period of time and can produce a large volume of sound. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention has the following configuration. This ceiling speaker device comprises a housing formed with a width sufficient to pass through a hole formed in a ceiling board, passed through the hole from the inside of the room and positioned on the back surface of the ceiling board, a decorative panel positioned on the front surface side of the ceiling board so as to sandwich the ceiling board between the housing and the decorative panel, and an opening blocking member attached to the housing and covering the opening formed between the housing and the hole. Effect of the Invention

[0008] According to one aspect of the present invention, the effect of maintaining the quality of the appearance seen from inside the room for a long period of time and obtaining a large volume of sound can be obtained. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a left side view showing a ceiling speaker device 10 according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a top view of the ceiling speaker device 10. As shown in FIG. [Diagram 3] FIG. 3 is a bottom view of the ceiling speaker device 10. As shown in FIG. [Figure 4]FIG. 4 is a plan view showing the opening closing member 7 provided in the ceiling speaker device 10. As shown in FIG. [Diagram 5] FIG. 5 is a diagram for explaining a method for attaching the ceiling speaker device 10 to a ceiling board T. As shown in FIG. [Figure 6] FIG. 6 is a top view showing the ceiling speaker device 10 attached to a ceiling board T. As shown in FIG. [Figure 7] FIG. 7 is a left side view showing the ceiling speaker device 10 attached to a ceiling board T. As shown in FIG. [Figure 8] FIG. 8 is a perspective view showing the ceiling speaker device 10 attached to a ceiling board T, as viewed obliquely from above and in the front left. [Figure 9] FIG. 9 is a cross-sectional view taken along the line S9-S9 in FIG. [Figure 10] FIG. 10 is a graph showing frequency characteristics for comparing the difference in reproduced sound pressure depending on whether or not the opening closing member 7 is present. [Figure 11] FIG. 11 is a cross-sectional view showing a state in which a ceiling speaker device 10A of the modified example is attached to a ceiling board T. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] One embodiment of the ceiling speaker device of the present invention will be described with reference to a ceiling speaker device 10. As shown in Fig. 5, a ceiling board T has a surface Ta on the indoor side and a back surface Tb on the opposite side, that is, on the underside of the ceiling. The ceiling speaker device 10 has a housing 12 and a decorative panel 32. The housing 12 is placed on the back surface Tb of the ceiling board T through a hole Th formed in advance in the ceiling board T from the room side (see arrow DR1). The hole Th is formed, for example, in a circular shape. The decorative panel 32 is disposed on the front surface Ta side of the ceiling board T so as to sandwich the ceiling board T between the housing 12 and the decorative panel 32.

[0011] First, the configuration of the ceiling speaker device 10 will be described mainly with reference to Fig. 1 to Fig. 4. Fig. 1 is a left side view showing the ceiling speaker device 10 according to one embodiment of the present invention. Fig. 2 is a top view of the ceiling speaker device 10, and Fig. 3 is a bottom view of the ceiling speaker device 10. Fig. 4 is a plan view showing an opening closing member 7 provided in the ceiling speaker device 10.

[0012] In Figures 1 to 3, the arrow "L" indicates the front-rear direction, "La" is the front, and "Lb" is the rear. Also, "U" is up and "D" is down. Also, in Figures 2 and 3, the arrow "W" indicates the left-right direction, with "Wc" being the left and "Wd" being the right.

[0013] The ceiling speaker device 10 is formed in a generally rectangular shape when viewed from above and is long in the front-rear direction. The ceiling speaker device 10 includes a housing 12, a speaker unit 14, a first electronic component 18, a second electronic component 24, a tension coil spring 34, a decorative panel 32 (see FIG. 7), and an opening closing member 7.

[0014] The housing 12 is formed in a flat box shape with an open bottom. The housing 12 is formed of, for example, resin. The housing 12 has a front inclined portion 12s, a unit accommodating portion 12c approximately in the center in the front-rear direction, and a rear stepped portion 12d. The width of the housing 12 is set so that it can pass through a hole Th formed in the ceiling board T.

[0015] The inclined portion 12s is a front portion of the housing 12, and is a wedge-shaped portion in which the upper surface inclines downward toward the front. By making the front portion wedge-shaped, when the ceiling speaker device 10 is placed in the attic through the hole Th from the front portion, the housing 12 can be installed without interfering with the top wall P (see FIG. 5) of the attic even if the top wall P is low.

[0016] The unit housing portion 12c is the portion that houses the speaker unit 14 and has the thickest vertical thickness. The speaker unit 14 is housed and held in the housing 12 with an axis CL14 aligned in the vertical direction. A plurality of exhaust pressure holes 12e are formed in a portion of the unit housing portion 12c that faces the back surface of the speaker unit 14. The exhaust pressure holes 12e allow sound that is emitted upward as a result of vibration of the diaphragm 141 (see FIGS. 3 and 9) of the speaker unit 14 to pass through and be emitted to the outside (above the ceiling). The unit housing section 12c has a protective frame section 16, which is a radial frame, on the lower surface side of the speaker unit 14 (see FIG. 3). The protective frame section 16 protects the diaphragm 141 and also passes sound emitted downward as the diaphragm 141 vibrates, and emits the sound toward the outside (inside the room).

[0017] The step portion 12d is a rear portion of the housing 12, and is a portion that extends like a flat plate and is thinner in the up-down direction than the unit accommodating portion 12c.

[0018] As shown in Fig. 3, the first electronic component 18 is accommodated inside the inclined portion 12s, and the second electronic component 24 is accommodated inside the stepped portion 12d. The first electronic component 18 is electrically connected to the second electronic component 24 and the speaker unit 14, and has a terminal block 30. When the ceiling speaker device 10 is installed above the ceiling, one end of an audio signal line that is wired above the ceiling in advance is connected to the terminal block 30. The other end of the audio signal line is connected to an external audio output device. As a result, an audio signal output from the audio output device is output as audio by the speaker unit 14 via the first electronic component 18 and the second electronic component 24.

[0019] 1 and 2, a groove 12g is formed on the upper surface of the unit housing portion 12c, extending obliquely from the front right portion to the rear left portion along the axis CL14 and carved downward. Through holes 12h, 12v are formed at both ends of the groove 12g, penetrating in the vertical direction. A tension coil spring 34 is housed in the groove 12g. Both ends of the tension coil spring 34 are drawn out to the lower side of the housing 12 through the through holes 12h, 12v, respectively, and locking hooks 36 having a diameter larger than that of the through holes 12h, 12v are attached thereto (see Figs. 3 and 7). As a result, the tension coil spring 34 does not come out of the through holes 12h, 12v and come out of the groove 12g, and the pair of locking hooks 36 can be pulled out downward by applying a force that resists the elastic repulsive force.

[0020] 1, the housing 12 has a notch 12n cut into an arc shape at the lower edge of the unit housing portion 12c. The notch 12n is formed so that the housing 12 is less likely to interfere with the hole Th when the ceiling speaker device 10 is passed through the hole Th of the ceiling board T. This makes it easier to pass the housing 12 through the hole Th.

[0021] 7 has a circular plate-shaped bottom wall portion 321 and a peripheral wall portion 322 that rises so as to expand obliquely upward from the periphery of the bottom wall portion 321. A plurality of sound emission holes 32b, which are small-diameter through holes, are formed in the bottom wall portion 321. In addition, the bottom wall portion 321 is provided with locking rings 32a at positions corresponding to the pair of locking hooks 36 attached to both ends of the tension coil spring 34, on which the locking hooks 36 can be hooked.

[0022] 1 to 3, the opening closing member 7 is attached to each of the left and right side walls of the housing 12. Specifically, the opening closing member 71 is fixed by a fastener N1 to the left side wall 121 at a location roughly corresponding to the unit accommodating portion 12c, and the opening closing member 72 is fixed by a fastener N2 to the right side wall 122. The fasteners N1 and N2 are, for example, tap screws. The opening closing member 71 and the opening closing member 72 are members having the same shape, and an example is shown in FIG.

[0023] 4, the opening closing member 7 is a generally bow-shaped member that is symmetrical with respect to a central axis line CL7. The opening closing member 7 has a degree of flexibility that allows it to be easily bent with fingers. The material of the opening closing member 7 is, for example, a silicone rubber sheet.

[0024] The opening closing member 7 has an outer shape including an arc-shaped portion 7d corresponding to a circular arc, a first edge portion 7b corresponding to a chord of the circle, and a pair of second edges 7c connecting the first edge portion 7b and the arc-shaped portion 7d and perpendicular to the first edge portion 7b. The arc-shaped portion 7d is, for example, an arc having a radius R7 with a center C7. The radius R7 is larger than half (the radius) of the inner diameter φDth (see FIG. 5) of the hole Th in the ceiling board T.

[0025] The external shape of the opening closing member 7 is not limited to the above shape. For example, it may be an arch shape consisting of only the arc-shaped portion 7d and the first edge portion 7b without the second edge portion 7c. The arc-shaped portion 7d does not have to be a perfect circular arc, and may be a line having curved portions with different curvatures, or a line having curved portions and straight portions.

[0026] A plurality of through holes 7a are formed along the first edge portion 7b in a portion adjacent to the first edge portion 7b. The opening closing member 7 is fixed to the housing 12 by fastening the fasteners N1 and N2, which are the tap screws described above, inserted into the through holes 7a. The opening closing member 7 can be virtually divided into a fixed portion 7n and a closing portion 7t. The fixed portion 7n is a portion fixed by the fasteners N1 and N2, specifically, a portion that is in close contact with the housing 12 by the fasteners N1 and N2, and is a rectangular area surrounded by a first edge portion 7b and a second edge portion 7c. The closing portion 7t corresponds to the arc-shaped portion 7d on the tip side of the fixed portion 7n, and is a bow-shaped area that can be freely deformed by an external force without being restrained by the fasteners N1 and N2. The opening closing member 7 has flexibility and can be bent by application of force by hand F, and returns to its original shape when the force is released.

[0027] As described above, the ceiling speaker device 10 has a pair of opening closing members 71, 72 attached to the housing 12, and can be attached by hand F to a ceiling board T in which a circular hole Th is formed in advance, in the following procedure.

[0028] Since the opening closing members 71 and 72 are flexible, the closing portions 7t of the opening closing member 71 shown on the near side of Fig. 5 and the opening closing member 72 (not shown) on the opposite side are folded upward by approximately 180° and held between the thumb F1 and the other finger F2 so as to be pressed against the housing 12. This makes them passable through the hole Th, so they are inserted from the front end side of the housing 12 through the hole Th and placed on the back surface Tb (see arrow DR1).

[0029] At this time, when the housing 12 passes through the hole Th, the opening closing members 71, 72 are released from the grip by the thumb F1 and the other finger F2, and the housing 12 is placed on the back surface Tb. As a result, the closing portion 7t of the opening closing member 72 tries to return to its original position (see arrow DR2 in FIG. 9) and comes into contact with the back surface Tb so as to urge it downward.

[0030] Next, the housing 12 is positioned in the front-rear and left-right directions so that the center of the hole Th in the ceiling board T and the axis CL14 of the speaker unit 14 are roughly aligned. Thereafter, as shown in Fig. 7, the locking hook 36 is grasped with fingers or a jig, and pulled downward against the elastic repulsive force of the tension coil spring 34 to hook onto the locking ring 32a of the decorative panel 32. When the force pulling out the tension coil spring 34 is released, the decorative panel 32 is pulled upward by the elastic compressive force of the tension coil spring 34, and the ceiling board T is sandwiched vertically together with the housing 12. In this way, the ceiling speaker device 10 is attached to the ceiling board T. The opening closing members 71 and 72 cover the pair of openings Tk (see FIG. 6) on the left and right sides formed between the housing 12 and the hole Th such that the closing portions 7t of the openings Tk are covered. This state is shown in FIG. 6 (top view), FIG. 8 (perspective view), and FIG. 9 (cross-sectional view).

[0031] 6, when the opening closing member 7 (71, 72) presses the rear surface Tb of the ceiling board T to close the opening Tk, the center of curvature of the arc-shaped portion 7d roughly coincides with the axis CL14 of the speaker unit 14. In other words, the hole Th and the arc-shaped portion 7d are substantially concentric when viewed from above. Therefore, although the opening closing member 7 does not completely block the opening Tk between the hole Th and the housing 12 in terms of ventilation, it completely covers the opening Tk at least when viewed from above. Therefore, the amount of dust in the ceiling that passes through the opening Tk and reaches the decorative panel 32 is extremely small and negligible, and dust does not accumulate inside the decorative panel 32, so that the appearance quality at the time of installation is maintained for a long period of time.

[0032] Acoustically, the opening blocking member 7 reduces the amount of sound output from the rear side of the speaker unit 14 into the space above the ceiling that travels inside the room through the opening Tk, and there is almost no risk of the volume being reduced due to interference between the sound output to the inside of the room and the sound that travels inside the room through the opening Tk.

[0033] The acoustic effect of the opening closing member 7 is shown in the graph of FIG. Fig. 10 shows the sound pressure frequency characteristics obtained by collecting the output sounds of a ceiling speaker device 10 installed on a ceiling board T and a comparative speaker device in which the opening blocking member 7 is removed from the ceiling speaker device 10 at the same spatial position and under the same conditions inside the room. The characteristic RF of the ceiling speaker device 10 is shown by a solid line, and the characteristic RF1 of the comparative speaker device is shown by a dashed line. Fig. 10 shows the frequency range below 2KHz where the difference between the characteristic RF and the characteristic RF1 is particularly noticeable. No significant difference was observed in the sound pressure in the so-called high range above 2KHz.

[0034] 10, in the frequency range of 2 KHz or less, the characteristic RF has a sound pressure that is approximately 3 dB higher than the characteristic RF1. In other words, it has become clear that by mounting the opening closing member 7, a significant increase in sound pressure is obtained in the frequency range of 2 KHz or less, which is called the mid-low range, and the ceiling speaker device 10 can produce a large volume.

[0035] Also, in the frequency range below 2KHz, the frequency at which the same sound pressure can be obtained is lower with the RF characteristic than with the RF1 characteristic. For example, in the bass range, the frequency at which the sound pressure drops to 65dB is about 110Hz with the RF1 characteristic, while it is 100Hz with the RF characteristic. In other words, it is confirmed that the reproduction frequency range in the bass range is expanded.

[0036] The embodiment described above in detail is not limited to the configuration, and may be modified without departing from the spirit and scope of the present invention.

[0037] An example of the ceiling speaker device 10 has been described in which the opening blocking member 7 is attached to the housing 12 in a position in which it extends downward in its natural state, but this is not limited to this, and the ceiling speaker device 10A may be a modified example described below.

[0038] 11, the ceiling speaker device 10A has a housing 12A corresponding to the housing 12, and an opening closing member 7A (71A, 72A) corresponding to the opening closing member 7 (71, 72). The opening closing member 7A is attached to the housing 12 in a posture extending in a direction perpendicular to the axis line CL14 (left and right direction) in a natural state.

[0039] As a result, when the ceiling speaker device 10A is passed through the hole Th, the opening closing member 7A only needs to be bent by approximately 90° (see arrow DR11), making the work easier and allowing the use of a stiffer sheet material that is less prone to bending than the opening closing member 7, which must be bent by approximately 180°. Meanwhile, when the ceiling speaker device 10A is attached to the ceiling board T, the opening closing member 7A is in its natural position and does not press against the back surface Tb of the ceiling board T.

[0040] In this regard, the opening closing member 7 of the ceiling speaker device 10 is bent by approximately 90° when the ceiling speaker device 10 is attached to the ceiling board T, and presses the back surface Tb with a force that tries to return it to its original position. Therefore, even if the periphery of the hole Th is uneven, the opening closing member 7 makes the opening Tk smaller by the pressing force for returning it.

[0041] The material of the opening closing members 7, 7A and the structure for attaching them to the housing 12 are not limited to those described above. [Explanation of symbols]

[0042] 7, 71, 72, 7A, 71A, 72A Opening closing member 7a Through hole 7b 1st edge 7c 2nd edge 7d arc 7n Fixed part 7t blockage 10,10A Ceiling speaker unit 12,12A Housing 12c Unit storage area 12e Exhaust hole 12s slope section 12d stepped section 12g groove 12h,12v through hole 12n Cutting section 121 Left side wall 122 Right side wall 14 Speaker unit 141 Vibration plate 16 Protective frame 18 First Electronic Parts 24 Second Electronic Parts 30 Terminal block 32 Decorative Panel 321 Bottom wall 322 Peripheral wall section 32a Locking ring 32b Sound emission hole 34 Tension coil spring 36 Locking hook CL14 axis C7 Center F Hand F1 personal finger F2 refers to N1, N2 Fixtures P Sky Wall RF,RF1 Characteristics R7 Radius T Patio ボード Ta Surface Tb inside Th hole Tk Opening φDth inner diameter

Claims

1. a housing having a width allowing the housing to pass through a hole formed in a ceiling board, the housing being passed through the hole from the indoor side and disposed on the rear surface of the ceiling board; a decorative panel disposed on a front surface side of the ceiling board so as to sandwich the ceiling board between the housing and the decorative panel; an opening closing member attached to the housing and covering an opening between the housing and the hole; A ceiling speaker device equipped with the above.

2. 2. The ceiling speaker device according to claim 1, wherein said opening closing member has flexibility, is bendable when a force is applied thereto, and returns to its original shape when the force is released.

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