CN112073883A - Lighting device - Google Patents

Abstract

Provided is a lighting device having a plurality of speakers with high volumetric efficiency. The lighting device (100) is provided with: a first speaker unit (101); a case (111); an annular part (103) which is arranged on the sound radiation side of the first speaker unit (101) and forms a sound path (110) for guiding the sound radiated by the first speaker unit (101) to the outside of the box body (111); an acoustic path forming body (121) disposed with a cylindrical acoustic path (110) disposed inside the annular portion (103) interposed therebetween; a second speaker unit (102) which radiates sound in the same direction as the first speaker unit (101) and is housed in the sound channel formation body (121); a resonance section (104) having an opening (141) communicating with the acoustic path (110) and forming a resonance space (142); a cover member (118) that covers the front of the resonance space (142); the light source (105) is disposed in the resonance space (142).

Description

Lighting device

Technical Field

The present invention relates to an illumination device, and to an illumination device provided with a plurality of speaker units.

Background

Conventionally, a structure has been proposed in which a plurality of speakers such as a woofer and a tweeter are mounted to a lighting device. For example, in patent document 1, a speaker for high pitch is disposed in a suspended illumination portion, and a woofer for low pitch is attached to a fixed portion attached to a ceiling, thereby preventing the suspended illumination portion from being shaken by vibration of the woofer.

Prior Art

Patent document

Patent document 1 Japanese patent application laid-open No. 2016-

Disclosure of Invention

Problems to be solved by the invention

By providing a plurality of speakers that are in charge of different frequency bands, such as a woofer and a tweeter, as in the lighting device described in patent document 1, it is possible to improve sound quality. However, the size of the illumination device itself is increased, and it is difficult to achieve miniaturization.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a lighting device which includes a plurality of speaker units and can be reduced in size.

Means for solving the problems

In order to achieve the above object, an illumination device according to the present invention includes: the disclosed device is provided with: a speaker unit; a cabinet accommodating the speaker unit; an annular portion disposed on a sound radiation side of the speaker unit so as to surround a diaphragm of the speaker unit, and forming a sound path for guiding the sound radiated from the speaker unit to the outside of the cabinet; an acoustic path forming body disposed with the cylindrical acoustic path disposed inside the annular portion interposed therebetween; a resonance unit that radiates sound in the same direction as the speaker unit, has an opening communicating with the sound path, and forms a resonance space; a cover member covering a front of the resonance space; and a light source disposed in the resonance space.

Another lighting device according to the present invention includes: a speaker unit; a cabinet accommodating the speaker unit; an annular portion disposed on a sound radiation side of the speaker unit so as to surround a diaphragm of the speaker unit, and forming a sound path for guiding the sound radiated from the speaker unit to the outside of the cabinet; an acoustic path forming body disposed with the cylindrical acoustic path disposed inside the annular portion interposed therebetween; a resonance unit that radiates sound in the same direction as the speaker unit, has an opening communicating with the sound path, and forms a resonance space; a cover member covering a front of the resonance space; a cover member having a horn structure portion whose opening is gradually enlarged toward the front; and a light source that emits light to an inner peripheral surface of the horn structure.

Effects of the invention

According to the present invention, in the lighting device, by disposing the light source in the resonance portion, it is possible to radiate sound with less sound quality change due to the listening position and radiate sound with high sound quality with less distortion.

Drawings

Fig. 1 is a perspective view showing an external appearance of the lighting device according to the present embodiment.

Fig. 2 is a perspective view showing the inside of the illumination device in the present embodiment, with the cover member omitted.

Fig. 3 is a sectional view of the lighting device in the present embodiment.

Fig. 4 is a diagram for explaining the low-range reproduction limit frequency.

Fig. 5 is a sectional view showing another example 1 of the lighting device.

Fig. 6 is a sectional view showing a lighting device with a horn.

Fig. 7 is a cross-sectional view of the case where the illumination device with a horn is set to indirect illumination.

Fig. 8 is a sectional view showing another example 2 of the lighting device.

Description of the reference numerals

100 lighting device

101 first loudspeaker unit

102 second speaker unit

103 ring-shaped part

104 resonance part

105 light source

110 sound path

111 case body

112 vibration plate

113 Voice coil

114 frame

115 magnetic yoke

116 magnet

117 plate

118 cover component

121 acoustic path forming body

122 back side part

130 gap

131 connecting part

141 opening

142 resonance space

143 Sound absorbing member

151 light conversion member

152 power supply device

181 horn structure part

Detailed Description

Hereinafter, an embodiment of the lighting device of the present invention will be described with reference to the drawings. The numerical values, shapes, materials, constituent elements, positional relationships of the constituent elements, connection states, and the like shown in the following embodiments are examples, and do not limit the present invention. In the following, although a plurality of inventions are described as one embodiment, constituent elements not described in the claims are described as arbitrary constituent elements for the inventions according to the claims. The drawings are schematic drawings in which appropriate emphasis and omission are given and the ratio is adjusted for explaining the present invention, and may be different from the actual shape, positional relationship, and ratio.

Fig. 1 is a perspective view showing an external appearance of a lighting device according to an embodiment. Fig. 2 is a perspective view showing the illumination device according to the present embodiment with a cover member removed. Fig. 3 is a sectional view showing the inside of the lighting device in the present embodiment.

As shown in these figures, the lighting device 100 is a speaker in which two speaker units are arranged in a front-rear direction (X-axis direction in the figures), and includes a first speaker unit 101, a second speaker unit 102, a cabinet 111, an acoustic path forming body 121, a ring-shaped portion 103, a resonance portion 104, and a light source 105.

The first speaker unit 101 is a speaker designed to radiate sound in a lower sound range than the second speaker unit 102, and is configured by a vibration system including a diaphragm 112, a voice coil 113, and a frame 114, and a magnetic field portion including a yoke 115, a magnet 116, and a flat plate 117.

In the present embodiment, the first speaker unit 101 is housed in the housing 111, and is attached to the cover member 118 that closes the front opening of the housing 111 with the ring-shaped portion 103 interposed therebetween. The first speaker unit 101 may be held by the cabinet 111 via a holding member or the like.

In the present embodiment, the first speaker unit 101 is shown as a normal speaker having a cone-shaped (cone-shaped ) diaphragm, but the first speaker unit 101 is not particularly limited and may be replaced with another speaker.

The second speaker unit 102 is a speaker smaller than the first speaker unit 101, and is a speaker designed to be responsible for radiation of sound in a high sound range compared to the first speaker unit 101. The second speaker unit 102 also includes a diaphragm, a voice coil, a frame, a yoke, a magnet, a flat plate, and the like, as in the first speaker unit 101, but these are not illustrated.

The second speaker unit 102 is disposed to radiate sound in the same direction as the first speaker unit 101 toward the front (X-axis negative side in the drawing) of the diaphragm 112 of the first speaker unit 101. The second speaker unit 102 is housed and held in the acoustic path forming body 121 disposed between the second speaker unit 102 and the diaphragm 112 of the first speaker unit 101.

In the case of the present embodiment, the first speaker unit 101 and the second speaker unit 102 are disposed in a state in which the axes of the voice coils thereof are aligned, and are disposed in a so-called coaxial speaker arrangement.

In the present embodiment, the second speaker unit 102 is shown as a normal speaker, but the second speaker unit 102 is not particularly limited and may be replaced with another speaker.

The annular portion 103 is an annular (cylindrical) member, and is disposed so as to surround the diaphragm 112 of the first speaker unit 101 on the side of the first speaker unit 101 where sound is radiated (on the negative side of the X axis in the drawing), that is, in the front and around the outside of the second speaker unit 102, and guides the sound radiated from the first speaker unit 101 to the outside of the cover member via a cylindrical sound path 110.

In the case of the present embodiment, the diaphragm 112 of the first speaker unit 101 is conical (cone type ), and the annular portion 103 has a cylindrical shape having an inner diameter substantially equal to the diameter of the bottom surface of the diaphragm 112. The annular portion 103 is provided with holes (or notches) functioning as openings 141 of the resonance portion 104 described later at a plurality of positions (four positions in the case of the present embodiment).

The resonance portion 104 is a portion having an opening 141 communicating with the acoustic path 110 and forming a resonance space 142. In the present embodiment, the resonance space 142 is formed by the annular portion 103, the resonance portion 104, and a part of the cover member 118, and is a closed space except for the opening 141 communicating with the acoustic path 110.

Further, a part of the case 111 may form the resonance space 142. Note that, although the resonance portion 104 is described as a member that forms the resonance space 142 together with other members, the resonance space 142 may be formed only by the resonance portion 104.

The size of the resonance space 142 formed in a closed state by the resonance portion 104 and the size of the opening 141 are arbitrarily determined in accordance with the frequency of acoustic resonance passing through the acoustic path 110, and may include not only the annular resonance space 142 surrounding the annular portion 103 as in the present embodiment but also a plurality of divided resonance spaces 142.

The number of the openings 141 is also arbitrary, but it is preferable that the openings are provided at a plurality of positions, and in the case of providing a plurality of positions, the openings are preferably provided uniformly in the circumferential direction.

In the present embodiment, sound absorbing material 143 (not shown in fig. 2) is disposed in resonance space 142 formed by resonance unit 104. Here, the sound absorbing material 143 is a member for amplifying acoustic resistance, and is made of a porous material. Here, the porous material includes not only a material having bubbles in a dispersed state, such as a sponge made of resin, but also a cotton-like material made of entangled fibers. By disposing the sound absorbing member 143 in the resonance space 142, the degree of suppression of resonance caused by the resonance space 142 can be controlled.

The sound absorbing material 143 may be made of a material that transmits or scatters light or the like emitted from the light source 105 disposed in the resonance space 142, and may be made of transparent glass wool or the like made of entangled fibers.

The acoustic path forming body 121 is disposed inside the annular portion 103, and forms a cylindrical acoustic path 110 together with the annular portion 103. The acoustic path formation member 121 also functions as a second case for housing the second speaker unit 102 and forming an air chamber in the second speaker unit 102.

In the present embodiment, the sound path forming body 121 includes a back surface portion 122 (see fig. 3) along the shape of the diaphragm on a surface facing the diaphragm 112 of the first speaker unit 101. The rear surface portion 122 is disposed at a critical position where interference does not occur even when the diaphragm 112 of the first speaker unit 101 vibrates to radiate sound. Thus, the sound radiated from the diaphragm 112 is effectively radiated to the outside of the cover member via the acoustic path 110.

The cover member 118 covers the front of the resonance space 142. In the present embodiment, the cover member 118 functions as a baffle that covers the front opening of the housing 111, and is also disposed over the entire surface of the acoustic path forming body 121. The cover member 118 holds the acoustic path formation body 121 and the second speaker unit 102. The cover member 118 is provided with a plurality of circular arc-shaped slits 130 arranged on the circumference so as to communicate with the sound path 110, and the lighting device 100 is configured such that sound from the first speaker unit 101 is radiated to the outside through the slits 130.

In the present embodiment, the diameter D (see fig. 3) of the slit 130 arranged on the circumference, that is, 2 times the radius of curvature of the inner side of the slit 130 is set to be equal to or more than half the wavelength calculated from the low-range reproduction limit frequency of the second speaker unit 102. By setting in this manner, the sound pressure characteristics of the entire sound emitted from the slit 130 and the sound emitted from the second speaker unit 102 can be made flat. For example, the following are specific examples: if the low range reproduction limit frequency fL is 2000Hz, the wavelength of 2000Hz is 344/2000 170mm (344 is the speed of sound). Therefore, the diameter D is preferably 85mm or more which is a half of the wavelength. Here, the low-range reproduction limit frequency is a limit frequency of a low sound range that can be reproduced by the speaker unit, and as schematically shown in fig. 4, if the reproduction frequency is lowered, the frequency fL at which the sound pressure is sharply lowered is the low-range reproduction limit frequency.

Further, the acoustic characteristics are improved by making the front surface of the cover member 118 a single surface. Further, the cover member 118 is formed by forming a slit 130 penetrating in the thickness direction in one circular plate material. Further, since the acoustic path forming body 121 is attached to the center portion via the cover member 118 attached to the housing 111, the slit 130 is not completely annular but divided by the connecting portion 131.

The cover member 118 has a light-transmitting property for transmitting light emitted from the light source 105. The material of the cover member 118 is not particularly limited, and examples thereof include transparent resins such as acrylic resin, polycarbonate, and ABS resin, and glass. Further, a light distribution structure such as an uneven structure is provided on the surface of the cover member 118 to adjust the alignment.

The light source 105 is disposed in the resonance space 142. In the present embodiment, the light source 105 is attached to the inner surface of the rear side (the positive side in the X axis direction in the drawing) of the resonance unit 104 so as to emit light toward the cover member 118. The type of the light source 105 is not particularly limited, and examples thereof include a Light Emitting Diode (LED), an organic electro-luminescence (OEL), and the like. In the present embodiment, an LED is used as the light source 105, and a plurality of LEDs are mounted in a row on the circumference of the bottom surface of the ring-shaped resonance portion 104. Further, a light conversion member 151 containing a fluorescent substance is disposed in front of the LED, and white light is emitted by light emitted from the LED and light from the LED as excitation light and emitted from the light conversion member 151. The light source 105 emits light based on power from a power supply device 152 mounted on the outer surface of the rear side of the case 111. The power supply device 152 may be disposed in the case 111.

As described above, according to the lighting device 100 of the present embodiment, although two speaker units are provided, the light source 105 is disposed in the resonance space 142, so that the volume efficiency can be improved and the high sound quality can be achieved. Therefore, the sound-emitting device can be embedded in a ceiling or a wall in a room, and can provide lighting, music, and other sounds without sacrificing the indoor space.

Further, since the two speaker units are arranged coaxially, it is possible to reduce the size of the whole device, and to exhibit the effect of reducing the sound quality change caused by the listening position as if the sound is radiated from a point sound source.

Further, it is possible to suppress the occurrence of cross modulation distortion and radiate sound of high sound quality. Specifically, the first speaker unit 101 and the second speaker unit 102 are arranged coaxially, and the sound generated from the first speaker unit 101 is radiated from a place away from the second speaker unit 102 by a predetermined distance, thereby suppressing the occurrence of cross modulation distortion. Further, by disposing the sound path formation member 121 in front of the first speaker unit 101 and making the surface of the sound path formation member 121 facing the diaphragm 112 follow the shape of the diaphragm 112, the sound of the first speaker unit 101 can be efficiently guided to the sound path 110, and the sound of the first speaker unit 101 can be efficiently radiated from the gap. As a result, the sound emitted from the lighting device 100 as a whole can be enhanced in quality.

However, the present invention is not limited to the above embodiments. For example, another embodiment in which the constituent elements described in the present specification are arbitrarily combined and several of the constituent elements are excluded may be adopted as the embodiment of the present invention. Further, a modification example obtained by applying various modifications to the above-described embodiment within a range not departing from the gist of the present invention, i.e., meaning indicated by words described in claims is also included in the present invention.

For example, the resonance space 142 may be present at least one of outside and inside the acoustic path 110. As shown in fig. 5, the resonance space 142 existing inside the acoustic path 110 may be closed by the acoustic path forming body 121 and the cover member 118 except for the opening 141. Further, the resonance space 142 may be formed by the resonance portion 104 independent of the cover member 118, the housing, and the like. As described above, when there are a plurality of resonance spaces 142, the light source 105 may be disposed in at least one resonance space 142, or may be disposed in all resonance spaces 142.

The cover member 118 shown in fig. 6 may have a horn structure 181 that gradually widens toward the front. This can improve light diffusibility. Further, the sound volume within a predetermined range can be increased by suppressing the spread of sound.

As shown in fig. 7, the illumination device 100 may be provided with a light source 105 that emits light on the inner peripheral surface of the horn structure 181. This allows indirect illumination.

As shown in fig. 8, the lighting device 100 may not include the second speaker unit.

In addition, the cover member 118 may have a light diffusion structure, instead of scattering light by the sound absorbing material 143. Specifically, examples thereof include a method in which small-diameter beads for scattering light are dispersed and arranged in the cover member 118, and a method in which the surface of the cover member 118 is roughened to have a ground glass shape.

The diameter of the circumference of the cover member 118 on which the slit 130 is disposed may be smaller or larger than the diameter of the diaphragm 112 of the first speaker unit 101.

The shape of the diaphragm 112 of the first speaker unit 101 is described as a conical shape, but the shape of the diaphragm of the speaker unit is not particularly limited, and a flat plate-shaped diaphragm may be provided. The shape of the vibrating plate may be not only circular or elliptical but also rectangular.

Further, the case and the cover member 118 are described as separate bodies, but they may be integrated. Further, the central portion and the peripheral portion of the cover member 118 may be different members.

Although the case 111 has been described as a separate case, the case 111 may be used in common with a case of an electronic device such as a television or a computer, or in common with a structure of a moving body such as a vehicle or an airplane.

The present invention can be applied to an illumination device capable of reproducing an audio signal such as music.

Claims (8)

1. An illumination device, comprising:

a speaker unit;

a cabinet accommodating the speaker unit;

an annular portion disposed on a sound radiation side of the speaker unit so as to surround a diaphragm of the speaker unit, and forming a sound path for guiding the sound radiated from the speaker unit to the outside of the cabinet;

an acoustic path forming body disposed with the cylindrical acoustic path disposed inside the annular portion interposed therebetween;

a resonance unit that radiates sound in the same direction as the speaker unit, has an opening communicating with the sound path, and forms a resonance space;

a cover member covering a front of the resonance space; and

a light source disposed in the resonance space.

2. The lighting device of claim 1,

the lighting device includes a first speaker unit and a second speaker unit that emits sound in the same direction as the first speaker unit, as the speaker unit;

the annular portion is disposed on a sound radiation side of the first speaker unit so as to surround a diaphragm of the first speaker unit, and forms a sound path for guiding the sound radiated from the first speaker unit to the outside of the cabinet;

the sound path forming body houses the second speaker unit.

3. The lighting device of claim 1 or 2,

the cover member has a light-transmitting property for transmitting light emitted from the light source.

4. The lighting device of claim 1 or 2,

the cover member has a light diffusing structure.

5. The lighting device of claim 1 or 2,

the cover member has a light distribution structure.

6. The lighting device of claim 1 or 2,

a sound absorbing member having light permeability is provided between the light source and the cover member.

7. The lighting device of claim 1 or 2,

the cover member includes a horn structure portion whose opening is gradually enlarged toward the front.

8. An illumination device, comprising:

a speaker unit;

a cabinet accommodating the speaker unit;

an annular portion disposed on a sound radiation side of the speaker unit so as to surround a diaphragm of the speaker unit, and forming a sound path for guiding the sound radiated from the speaker unit to the outside of the cabinet;

an acoustic path forming body disposed with the cylindrical acoustic path disposed inside the annular portion interposed therebetween;

a resonance unit that radiates sound in the same direction as the speaker unit, has an opening communicating with the sound path, and forms a resonance space;

a cover member covering a front of the resonance space;

a cover member having a horn structure portion whose opening is gradually enlarged toward the front; and

and a light source that emits light toward an inner peripheral surface of the horn structure.

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