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US 5,471,018 AGranted
Audio or video apparatus with a built-in loudspeaker
AssigneeU.S. Philips Corporation
InventorsJoris A. M. Nieuwendijk, Johannes W. T. Bax, Cornelis J. Oepkes, Henricus H. Roelofs, Martinus P. M. Van Den Thillart
Life of this patent
Estimating the term…
Abstract
An audio or video apparatus has a housing, a loud-speaker and an acoustic channel. The loud-speaker acoustically cooperates with the channel. One end of the channel opens into an aperture in a side of the apparatus. The dimensions of the loud-speaker and acoustic channel and the positioning thereof within the housing are chosen so as to provide an apparatus that is compact and at the same time produces improved audio reproduction.
Claims15
Audio or video apparatus comprising:
- a housing, a cone loud-speaker incorporated in the housing, wherein the housing accommodates an acoustic channel having one end opening into an aperture in a side of the housing, wherein the loud-speaker acoustically cooperates with the channel and a diaphragm of the loud-speaker forms a part of a wall of the acoustic channel, and the acoustic channel has a perpendicular cross-section which continuously increases viewed in the direction of the aperture in said side, characterized in that the length of the loud-speaker viewed in the longitudinal direction of the acoustic channel is greater than or equal to half the length of the acoustic channel, and in that the loud-speaker is arranged in the channel and the channel is shaped in a manner such that for a part of the loud-speaker diaphragm, the size of said part being greater than or equal to half the surface of the diaphragm, lines perpendicular to said part of the diaphragm surface, once they have been reflected by the channel surface one time, are not directed at said aperture, said lines forming equal angles of incidence and reflection to the channel surface, and wherein the part of the channel wall opposite the loud-speaker has a form which is accommodated to the form of the loud-speaker cone.
An audio apparatus comprising:
- a housing having a sound aperture in one wall thereof,
- an acoustic channel within the housing having a flared end which opens into said sound aperture,
- a loudspeaker mounted within said housing and having a diaphragm in one wall of the acoustic channel so that the loudspeaker acoustically cooperates with said channel, said diaphragm having at least one dimension substantially larger than at least one dimension of said aperture and supported at an angle to said one wall of the housing, wherein a dimension of the diaphragm in the longitudinal direction of the acoustic channel is at least half of the length of the acoustic channel and the loudspeaker is arranged in the channel and the channel includes a sound reflecting surface shaped in a manner such that, for a part of said diaphragm which is at least half of the diaphragm surface area, lines perpendicular to said part of the diaphragm surface form equal angles of incidence and reflection to the channel surface and after a first reflection by the channel surface said lines are not directed at the aperture.
An audio apparatus comprising:
- a housing having a sound aperture in one wall thereof,
- an acoustic channel within the housing having a flared end which opens into said sound aperture,
- a loud-speaker mounted within said housing and having a diaphragm in one wall of the acoustic channel so that the loud-speaker acoustically cooperates with said channel, said diaphragm having at least one dimension substantially larger than at least one dimension of said aperture and supported at an angle to said one wall of the housing, wherein a dimension of the diaphragm in the longitudinal direction of the acoustic channel is at least half of the length of the acoustic channel and the loud-speaker is arranged in the channel and the channel is shaped in a manner such that for a part of said diaphragm which is at least half of the diaphragm surface area, lines perpendicular to said part of the diaphragm surface form equal angles of incidence and reflection to the channel surface and after a first reflection by the channel surface said lines are not directed at the aperture, and
- wherein the surface of the diaphragm is in a non-flared wall of the acoustic channel and the outer periphery of the diaphragm lies in a plane at an angle of approximately 90 degrees with respect to said one wall of the housing.
1 more element
A car radio audio apparatus comprising:
- a housing, a loud-speaker which reproduces a low-frequency audio signal and is incorporated in the housing, wherein the housing accommodates an acoustic channel having one end opening into an aperture in a side of the housing, wherein the loud-speaker acoustically cooperates with the channel and a diaphragm of the loud-speaker forms a part of a wall of the acoustic channel, and the acoustic channel has a perpendicular cross-section which continuously increases viewed in the direction of the aperture in said side, characterized in that the length of the loud-speaker viewed in the longitudinal direction of the acoustic channel is greater than or equal to half the length of the acoustic channel, and in that the loud-speaker is arranged in the channel and the channel is shaped in a manner such that for a part of the loud-speaker diaphragm, the size of said part being greater than or equal to half the surface of the diaphragm, lines perpendicular to said part of the diaphragm surface, once they have been reflected by the channel surface one time, are not directed at said aperture, said lines forming equal angles of incidence and reflection to the channel surface, and second and third loud-speakers reproducing a higher frequency portion of a respective left or right signal portion of a stereo signal, and wherein the second and third loud-speakers are mechanically coupled to said side of the housing.
Dependencies are inferred from the claim text.