Compound driver for acoustical applications
OwnerC. Ronald Coffininventor
Life of this patent
Estimating the term…
Abstract
A compound driver acoustic transducer. A frame supports a motion generator to one side of two diaphragms. An intermediate diaphragm is continuous and is driven by the motion generator. The intermediate diaphragm forms a closed volume with a solid portion of the frame that opens into a central opening through the other, open diaphragm. An axially rigid coupling connects the two diaphragms so they operate in unison.
Claims21
An acoustic transducer for generating acoustic waves along a transducer axis, said transducer comprising:
- A) a frame extending along the transducer axis with a central opening therethrough on the axis,
- B) a motion generator connected to said frame for producing an oscillatory output motion along the transducer axis,
- C) an open diaphragm with an outer periphery and an inner periphery that defines a central opening on the axis and axially proximate the central frame opening,
- D) first and second flexible couplings attaching said open diaphragm inner and outer peripheries to said frame generally transverse to the transducer axis and spaced from said motion generator,
- E) a continuous diaphragm with an outer periphery,
- F) a third flexible coupling attaching said continuous diaphragm outer periphery to said frame generally transverse to the transducer axis and intermediate of and spaced from said open diaphragm and said motion generator, said continuous diaphragm being attached to said motion generator, and
- G) an axially rigid coupling between said continuous and open diaphragms whereby motion of said continuous diaphragm produced by said motion generator produces corresponding motion of said open diaphragm and whereby air intermediate said diaphragms displaced by said continuous diaphragm moves through the central opening of said open diaphragm.
An loudspeaker for generating acoustic waves along a speaker axis, said loudspeaker comprising:
- A) a frame extending along the loudspeaker axis with a central opening therethrough on the axis,
- B) a magnetic structure connected to the frame including an magnet with an air gap and a voice coil on a bobbin in the air gap whereby electrical signals applied to the voice coil produce oscillatory motion of the voice coil in the air gap along the loudspeaker axis,
- C) an annular diaphragm with an outer periphery and an inner periphery that defines a central opening on the loudspeaker axis and axially proximate the central frame opening,
- D) first and second flexible couplings circumscribing said annular diaphragm inner and outer peripheries and attached to said frame to position said annular diaphragm transversely to the loudspeaker axis and spaced from said magnet structure,
- E) a continuous diaphragm with an outer periphery,
- F) a third flexible coupling circumscribing said continuous diaphragm outer periphery and attached to said frame to position said continuous diaphragm transversely to the loudspeaker axis and intermediate of and spaced from said annular diaphragm and said magnet structure, said continuous diaphragm being connected to said bobbin, and
- G) an axially rigid coupling between said continuous and annular diaphragms whereby motion of said continuous diaphragm produced by said voice coil and bobbin produces corresponding motion of said annular diaphragm and whereby air intermediate said diaphragms displaced by said continuous diaphragm moves through the central opening of said annular diaphragm.
A loudspeaker comprising a frame having a magnetic structure with an air gap and a voice coil for oscillating on a speaker axis through the air gap in response to electrical signals, said loudspeaker additionally comprising:
- A) an first speaker cone having an annular shape with an outer periphery attached to the frame and spaced from the magnetic structure,
- B) a second speaker cone with an outer periphery attached to the frame intermediate and spaced from each of the magnetic structure and said annular speaker cone, and
- C) an axially rigid coupling connected to said spaced first and second speaker cones and to the voice coil whereby oscillation of the voice coil along the speaker axis produces corresponding motion of said first and second speaker cones.
Dependencies are inferred from the claim text.