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A compact lightweight speaker system without a resonance box that can reproduce the original sound with high fidelity. A speaker unit is located on a baffle board with a vibration absorbing member between a frame of the speaker unit and the baffle board. Furthermore, an acoustic resonance reflecting

A compact lightweight speaker system without a resonance box that can reproduce the original sound with high fidelity. A speaker unit is located on a baffle board with a vibration absorbing member between a frame of the speaker unit and the baffle board. Furthermore, an acoustic resonance reflecting board of a vertical flat board type based on the operating principle of a passive radiator is formed by the baffle board and a flat board being similar to the baffle board. As a result, a compact smart design will be produced. It is applicable to an electric or electronic apparatus which produces sound.

대표청구항 ▼

What is claimed is: 1. A structure around a speaker unit, the structure comprising: a speaker unit comprising a frame supporting a magnet and a vibrating cone; and a back sound screening section for screening out indirect sounds which come from the back of the speaker unit and travel forward, the b

What is claimed is: 1. A structure around a speaker unit, the structure comprising: a speaker unit comprising a frame supporting a magnet and a vibrating cone; and a back sound screening section for screening out indirect sounds which come from the back of the speaker unit and travel forward, the back sound screening section including a sound transmitting hole portion; wherein the frame of the speaker unit is mounted to the back sound screening section through a vibration absorbing member which is remote from said vibrating cone to isolate the speaker unit from the back sound screening section so that the frame of the speaker unit can move freely in the direction in which the vibrating cone vibrates with strokes being substantially the same as the amplitude of the vibrations of the vibrating cone and indirect sounds are not transmitted from the frame of the speaker unit to the back sound screening section, and wherein the back sound screening section and the vibration absorbing member can screen out indirect sounds and transmit only direct sounds which come from the front of the speaker unit. 2. The structure around a speaker unit according to claim 1, wherein the back sound screening section is a baffle board or a back sound screening board. 3. The structure around a speaker unit according to claim 2, further comprising a fitting guide with a concave portion which is adapted to house the frame with room outside an edge of the frame is formed around the hole portion made in the baffle board and the frame is located in the concave portion through the vibration absorbing member. 4. The structure around a speaker unit according to claim 2, further comprising a fitting guide with a concave portion which is adapted to house the frame or an outer portion joined unitarily to the frame with room outside an edge of the frame or the outer portion, wherein the frame or the outer portion is located in the concave portion with the vibration absorbing member. 5. The structure around a speaker unit according to claim 4, wherein the fitting guide comprises another part separate from said baffle board. 6. The structure around a speaker unit according to claim 2, comprising: a pillow enclosing L-channel and R-channel dedicated speaker units; first and second baffle boards; and first, second and third vibration absorbing members; and a cushion material for the pillow which also serves to transmit direct sounds which come from the front of the speaker unit and to screen out indirect sounds which come from the back of the speaker unit and travel forward. 7. The structure around a speaker unit according to claim 2, wherein at front and rear of the direct sound transmitting section and the back sound screening section are arranged as the cushion material short tubes of hard resin with a thickness of between 0.5 and 1.5 millimeters, an outside diameter of between 5 and 15 millimeters, and a length of between 5 and 20 millimeters. 8. The structure around a speaker unit according to claim 7, further comprising: a base in which at least one cavity for housing said speaker unit is formed on the top of said vibration absorbing member having air-permeability and elasticity; sound emitting surfaces of the speaker unit faced outward; protective members for protecting the sound emitting surfaces of the speaker unit; and the short tubes of hard resin which covers the sound emitting surfaces. 9. The structure around a speaker unit according to claim 2, further comprising back sound screening boards which are located nearly on a plane extending from the edge of a vibrating board of a speaker so that space in front of the vibrating board is isolated from space behind the vibrating board and which are faced at almost right angles to a listener. 10. The structure around a speaker unit according to claim 9, wherein the back sound screening boards have a mechanism in which the relative positions are maintained without touching a speaker frame or by connecting with a speaker frame flexibly. 11. The structure around a speaker unit according to claim 10, wherein the back sound screening boards are freely foldable. 12. A structure around a speaker unit, the structure comprising: a speaker unit comprising a frame supporting a magnet and a vibrating cone; a back sound screening section for screening out indirect sounds which come from the back of the speaker unit and travel forward, wherein the back sound screening section comprises a baffle board having a sound transmitting hole portion, and back sound screening boards which are located nearly on a plane extending from the edge of a vibrating board of a speaker so that space in front of the vibrating board is isolated from space behind the vibrating board and which are faced at almost right angles to a listener, wherein the back sound screening boards are freely foldable and have a mechanism in which the relative positions are maintained without touching a speaker frame or by connecting with a speaker frame flexibly, wherein the frame of the speaker unit is mounted to the baffle board through a vibration absorbing member which is remote from said vibrating cone to isolate the speaker unit from the baffle board so that the frame of the speaker unit can move freely in the direction in which the vibrating cone vibrates with strokes being substantially the same as the amplitude of the vibrations of the vibrating cone and indirect sounds are not transmitted from the frame of the speaker unit to the baffle board, wherein the back sound screening section and the vibration absorbing member can screen out indirect sounds and transmit only direct sounds which come from the front of the speaker unit, and wherein the back sound screening boards are made of a foamed chloroethylene board, a wooden board, or a veneer board, have a thickness of between 1 and 10 millimeters, and have a maximum expanded external size of 3 meters or less from the center of a speaker unit. 13. The structure around a speaker unit according to claim 12, wherein a mat with a hole portion is provided as the back sound screening section and comprises a bag sealing therein liquid or gel, and wherein the surface of said vibrating cone is ventilated through the hole portion. 14. The structure around a speaker unit according to claim 13, wherein a shape and a mounting position of the mat is the same as those of the baffle board. 15. The structure around a speaker unit according to claim 14, wherein the vibration absorbing member is mainly constructed by the bag sealing therein liquid or gel and is positioned between said baffle board and said frame. 16. The structure around a speaker unit according to claim 15, wherein said frame is located in the concave portion through the vibration absorbing member comprised of the bag sealing therein liquid or gel. 17. The structure around a speaker unit according to claim 16, wherein constrictions are made on the bag sealing therein liquid or gel, and an irregular surface is formed by a recess-shaped or wave-shaped unevenness due to the constrictions. 18. The structure around a speaker unit according to claim 17 wherein said bag mainly consists of silicone rubber. 19. The structure around a speaker unit according to claim 18, wherein said gel has a stiffness and elasticity barely retaining its shape at room temperatures, and the bag is mainly formed by silicone rubber in the thickness of between 0.05 to 1 millimeter. 20. The structure around a speaker unit according to claim 19, wherein said gel is mainly formed by a high water absorbability polymer consisting of acrylamide cross-linking structure. 21. A structure around a speaker in which speaker units for outputting L-channel sound and R-channel sound independently to produce a stereophonic effect are located so that the speaker units face a listener's left and right ears respectively, the structure comprising: an L-channel dedicated speaker unit comprising a first magnet and a first vibrating cone; a first baffle board for holding the L-channel dedicated speaker unit flexibly with a first vibration absorbing member mounted between the first baffle board and the first vibrating cone; an R-channel dedicated speaker unit comprising a second magnet and a second vibrating cone; a second baffle board for holding the R-channel dedicated speaker unit flexibly with a second vibration absorbing member mounted between the second baffle board and the second vibrating cone; and a third vibration absorbing member extending between and directly interconnecting lateral edges of the first baffle board and the second baffle board in a stable manner, said lateral edges facing each other, a direct sound transmitting section for transmitting only direct sounds which come from the front of each speaker unit; and a back sound screening section for screening out indirect sounds which come from the back of each speaker unit and travel forward, wherein the first baffle board and the second baffle board are joined flexibly.