CN2150694Y - Energy-storage type phase inverting sound box - Google Patents

Abstract

The utility model belongs to a sound box, which is characterized in that the inner wall of a back cover plate is provided with one or two air energy storage chambers having an inner opening which is just over against the inverter tube of a woofer and an air vent which is contiguous and vertical to the inner opening. Since the inner opening of the inverter tube is just over against the woofer, low frequency radiant energy losses are few, and standing wave is not easy to be generated in the sound box. The air energy storage chambers have the function of an air spring, and when actual sound playing frequency offsets the natural frequency of the sound box, the sound box can buffer and amend. The utility model has simple and reasonable structure, low distortion, convulsed sound, favorable aftersound effect, convenient manufacture and low manufacturing cost.

Description

Energy-storage type phase inverting sound box

The utility model belongs to a kind of stereo set, is specifically related to a kind of reflex cabinet.

Use phase inverted cabinet more widely in the prior art, have the bass radiation efficiency high and when internal volume equates the audio amplifier resonance frequency low, advantage such as the cone amplitude is less, and the distortion factor is low; But, in order to hold the phase-reversing tube that cross-sectional area and woofer effective radiating area adapt, the then necessary corresponding amplification of its volume, otherwise phase-reversing tube will design very longly, and the expense material is time-consuming when not only making, transportation is inconvenient, also is difficult to accomplish compact attractive in appearance in appearance; In addition, when the system resonance frequency of actual playback frequency departure audio amplifier, the Oscillation Amplitude of the low basin of woofer is still bigger, is unfavorable for further reducing distortion; Moreover, because phase-reversing tube generally all is arranged on the installation panel of loud speaker, so the low frequency width of cloth penetrate must be by tank wall reflection and refraction after could discharge by phase-reversing tube, bigger low frequency radiation energy loss will be arranged like this, be easy to generate the case standing internal wave simultaneously and influence playing quality.Bulletin is CN2109034U, and application number has solved the deficiency of some above-mentioned reflex cabinets really for 91226936.7 patent application provides a kind of " the outer positive and negative cross-talk tone channel pipe audio amplifier of band ".But, because phase-reversing tube places outside the casing, if its tube section is long-pending too small or length is too short, the bass radiation will be weakened in a large number, do not reach purpose of design, if amplifier tube sectional area or increase length itself and corresponding woofer are complementary, then must cause and use the not compact defective such as attractive in appearance of inconvenience and outward appearance.

The purpose of this utility model provides a kind of many premium properties that can give full play to reflex cabinet, when the system resonance frequency of actual playback frequency departure audio amplifier, can oneself's buffering revise, the low frequency radiation energy loss is little, be difficult for producing the case standing internal wave, under the identical prerequisite of audio amplifier power and acoustics, can dwindle the audio amplifier volume greatly, simple and reasonable energy storage type reflex cabinet.

The utility model has casing, back shroud, panel, gauze face shield, high pitch loudspeaker, woofer, also is provided with the phase-reversing tube that dischargeable capacity and woofer adapt at the inwall place of back shroud; , be provided with aperture area and work as over against the woofer place at phase-reversing tube in the inner opening of woofer cone effective radiating area 40%～100%; Be positioned at inner opening top or bottom or one side or both sides, top or both sides, below on the phase-reversing tube, be provided with outer opening area or area sum 〉=inner opening area and that link to each other with the top board or the hole on base plate or back shroud or the side panel of casing; The bottom of inner opening or top or its opposite side or both sides, below or both sides, top also are provided with vertical one or two the adjacent air accumulation chamber with inner opening of blow vent, the dischargeable capacity of air accumulation chamber dischargeable capacity or volume sum 〉=phase-reversing tube.The cross sectional shape of phase-reversing tube can be the circular oval or round scarce shape of rectangle or polygon; Long-pending 10%～50% of the woofer cone effective radiating area that is equivalent in the effective cross section of phase-reversing tube.

When audio amplifier is worked, because the position appropriate design institute of aforesaid phase-reversing tube and inner opening thereof, outer opening extremely, the air-flow of the turnover audio amplifier that produces when working for audio amplifier provides shortest path, and then reduced reflection and the amount of refraction of bass radiation in case significantly, the loss that has reduced the bass radiation has also avoided producing the possibility of standing wave as far as possible, has improved the holding property of transient state that bass weight is put simultaneously to a certain extent; And because the airequivalent in the air accumulation chamber is an air spring, so reduced the sudden change amplitude of case internal gas pressure, thereby reduced the Oscillation Amplitude of woofer cone, when the system resonance frequency of actual playback frequency departure audio amplifier, can play the effect that oneself's buffering is revised, thereby reduce the distortion factor of replaying bass.

The utility model is not only simple and reasonable, and the distortion factor is low, sound mix thickly unfold, DEC decay is good, profile is small and exquisite attractive in appearance and have an advantage such as easy to make, low cost of manufacture.

Description of drawings:

Fig. 1, structural representation.

Fig. 2, the A-A of Fig. 1 is to view.

The utility model is described in further detail with embodiment below in conjunction with accompanying drawing: present embodiment includes casing 1, back shroud 2, panel 3, gauze face shield 4, high pitch loudspeaker 5, woofer 6, high pitch loudspeaker 5 and woofer 6 are assemblied in the first half of panel 3 and the corresponding position of Lower Half respectively, gauze face shield 4 is contained in the front of panel 3, panel 3 is fixed on the front end face place of casing 1, and back shroud 2 is contained in the rear end face place of casing 1.Middle part at back shroud 2 inwalls also vertically is provided with phase-reversing tube 7, and the cross section of phase-reversing tube 7 is a rectangle, and the appropriate section of back shroud 2 is the back tube wall of paraphase 7, and phase-reversing tube 7 cross-sectional areas are equivalent to 20% of woofer 6 cone effective radiating areas; The upper and lower end face of phase-reversing tube 7 withstands on the top board of casing 1 and the base plate respectively and sealing fully, phase-reversing tube 7 is provided with the inner opening 8 that length equals effective radiation diameter of woofer 6 cones over against woofer 6 places, its width equal its length 1/2 and be the width of phase-reversing tube 7, the top of phase-reversing tube 7 is provided with the outwards straight-through outer opening 9 that equals inner opening 8 length from the downward length of top board, its width equals the width of phase-reversing tube 7, and the bottom of phase-reversing tube 7 is the air accumulation chamber 10 that cross-sectional area that an opening makes progress equals phase-reversing tube 7 tube chamber cross-sectional areas.Present embodiment is selected the thick medium density fibre board (MDF) manufacturing of 10mm for use, and effect reaches designing requirement fully.

Claims (2)

1, energy storage type reflex cabinet, include casing (1), back shroud (2), panel (3), gauze face shield (4), high pitch loudspeaker (5), woofer (6), it is characterized in that: also be provided with the phase-reversing tube (7) that dischargeable capacity and woofer (6) adapt at the inwall place of back shroud (2); Locate to be provided with the inner opening (8) that aperture area is equivalent to woofer (6) cone effective radiating area 40%～100% at phase-reversing tube (7) over against woofer (6); Be positioned at inner opening (8) top or bottom or one side or both sides, top or both sides, below on the phase-reversing tube (7), be provided with outer opening (9) area or area sum 〉=inner opening (8) area and that link to each other with the top board or the hole on base plate or back shroud or the side panel of casing (1); The bottom of inner opening (8) or top or its opposite side or both sides, below or both sides, top, also be provided with vertical one or two the adjacent air accumulation chamber (10) of blow vent, the dischargeable capacity of the dischargeable capacity of air accumulation chamber (10) or volume sum 〉=phase-reversing tube (7) with inner opening (8).

2, energy storage type reflex cabinet according to claim 1 is characterized in that: the shape of cross section of phase-reversing tube (7) can be the circular oval or round scarce shape of rectangle or polygon; Long-pending 10%～50% of woofer (6) the cone effective radiating area that is equivalent in the effective cross section of phase-reversing tube (7).