Patent Publication Number: US-9426555-B2

Title: Acoustically tunable headphones

Description:
BACKGROUND 
     1. Field of Invention 
     This invention relates generally to headphones. More specifically, this invention relates to headphones that can be tuned acoustically by the user. 
     2. Description of Related Art 
     Headphones are commonly used to listen to audio signals such as voice communications, audio recordings, and music. Headphones generally comprises of a flexible headband that is placed over the head of a listener. On either sides of the flexible headband is affixed a speaker housing enclosing one or more speakers. The speaker housing commonly has a soft and flexible ear pad which enables the speaker housing to comfortably rest on or around the listener&#39;s ear. The flexible headband exerts a force that urges the speaker housings to press against the ear pads which in turn presses on or around the ear of the listener to seal out the outside environment from the ear. 
     Most headphone&#39;s acoustics are predetermined and fixed when the headphone was designed and manufactured. The user may generally vary the audio signal electronically by using a separate equalizer or other electronic adjustments to vary the various high and low frequencies. However, the acoustics of the headphones itself is generally not adjustable by the user. 
     There are some headphone designs that include complex and costly components to enable the user to adjust the frequency response of the headphones. These headphone designs use many small, complex, and movable components in their design to allow the user to vary the frequency response of the headphones. Although they are suitable for the purpose for which they were designed, they are expensive to manufacture and the complexity of the design also decrease the reliability of the headphones. The cost of these headphones and also the complexity of their design contributed to their lack of demand and the lack of popularity in the market. 
     BRIEF SUMMARY OF THE INVENTION 
     The present invention is an acoustically tunable headphones that is simple in construction and economical to manufacture. It allows the user of the headphones to easily adjust the acoustics of the headphones mechanically without the use of any complex and expensive electronics. 
     The acoustically tunable headphones comprises of a flexible headband with a speaker housing affixed on either end of the flexible headband. The speaker housing encloses one or more speakers behind a speaker grill with multiple openings. A soft and flexible ear pad is removably affixed in front of the speaker grill. A corresponding grill with corresponding openings is affixed in the ear pad. The acoustics of the headphones may be adjusted by rotating the ear pad to various positions which will place the multiple openings in the speaker grill in front of the speakers in various communications with the multiple openings in the grill in the ear pad. 
     It is an object of the present invention to design an acoustically tunable headphones with no additional electronics and no internal moving parts that is easily manufactured with minimal cost impact. 
     It is another object of the present invention to design an acoustically tunable headphones that may be easily adjusted by the user to change the acoustics of the headphones. 
     It is yet another object of the present invention to design an acoustically tunable headphones that has easily removable and replaceable ear pads that may be interchanged with other optional ear pads to enable further acoustical tuning of the headphones. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  shows a front plan view of the acoustically tunable headphones. 
         FIG. 2  shows a left side plan view of the acoustically tunable headphones. 
         FIG. 3  shows a perspective view of the acoustically tunable headphones. 
         FIG. 4  shows a perspective rear view of the preferred embodiment of the ear pad. 
         FIG. 5  shows a rear plan view of the preferred embodiment of the ear pad shown in  FIG. 4 . 
         FIG. 6  shows a side plan view of the preferred embodiment of the ear pad shown in  FIG. 4 . 
         FIG. 7  shows a perspective rear view of another embodiment of the ear pad. 
         FIG. 8  shows a rear plan view of the embodiment of the ear pad shown in  FIG. 7 . 
         FIG. 9  shows a side plan view of the embodiment of the ear pad shown in  FIG. 7 . 
         FIG. 10  shows a partially exploded perspective view of the preferred embodiment of the acoustically tunable headphones. 
         FIG. 11  shows another partially exploded perspective view of the preferred embodiment of the acoustically tunable headphones shown in  FIG. 10 . 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     The following description and figures are meant to be illustrative only and not limiting. Other embodiments of this invention will be apparent to those of ordinary skill in the art in view of this description. 
     Referring to  FIGS. 1, 2, 3, 10, and 11 , in the preferred embodiment, the acoustically tunable headphones  1  comprises of a flexible headband  2  with two ends  3 ,  4 . The flexible headband  2  may be made of an elastic metallic material, an elastic polymer, or a combination of them. A speaker housing  5 ,  6  is affixed on either end  3 ,  4  of the flexible headband  2 . The speaker housing  5 ,  6  may be made of a metallic material, a polymer, or a combination of them. As seen in  FIG. 10 , each speaker housing  5 ,  6  encloses one or more speakers  7  behind a speaker grill  18  with multiple openings  9 . The multiple openings  9  are generally arranged in subgroups of various number of openings and various sizes of openings around the center of the speaker grill  18 . 
     An ear pad  10 ,  11  with a soft and flexible padding and sealing material  12 ,  13  on one side around its circumference is removably affixed in front of the speaker grill  18 . The ear pad  10 ,  11  may be made of a metallic material, a polymer, or a combination of them. The soft and flexible padding and sealing material  12 ,  13  may be made of a foam, a polymer or leather covered foam, silicone, or any other suitable soft and flexible material that is comfortable when place in contact with the user&#39;s ear. As further shown in  FIGS. 4, 5, 6, 7, 8, and 9 , a corresponding grill  14  with corresponding openings  15  to the speaker grill  18  in front of the speakers  7  is affixed in the ear pad  10 ,  11  opposite the side with the padding material  12 ,  13 . The openings  15  are generally arranged in subgroups of various number of openings and various sizes of openings around the center of the grill  14  and may be rotated into or out of alignment with the multiple openings  9  in the speaker grill  18  in front of the speakers  7 . The ear pad  10 ,  11  is preferably removably attached to the speaker housing  5 ,  6  with one or more magnets. In the preferred embodiment, the ear pad  10 ,  11  has one or more permanent magnets affixed around the grill  14 . The speaker grill  18  in front of the speakers  7  is made of a magnetically attractive material such as steel for the magnets to attract to. Alternatively, the placement of the magnet and the magnetically attractive material may be reversed, wherein the grill  14  in the ear pad  10 ,  11  is made of a magnetically attractive material and one or more permanent magnets is affixed around the speaker grill  18  in front of the speakers  7 . 
     In the preferred embodiment, ridges  16  may be formed on the face with the grill  14  of the ear pad  10 ,  11  and corresponding valleys  17  may be formed on the speaker grill  18  in front of the speakers  7  to position the ear pad  10 ,  11  in a limited number of predetermined positions. Alternatively, the ridges may be formed on the speaker grill  18  in front of the speakers  7  and the valleys may be formed on the face with the grill  14  of the ear pad  10 ,  11 . 
     In the preferred embodiment, the ear pads  10 ,  11  and the speaker grills  18  in front of the speakers  7  are generally square shape with rounded corners, as shown in  FIGS. 4, 5, 6, 7, 8 , and  9 . The square shape allows four possible positions of the ear pad  10 ,  11  on the speaker grills  18  in front of the speakers  7 , therefore, four possible acoustic tunings from different combinations of the openings. Alternatively, the ear pads and grills may be elliptical or rectangular shape. This will allow two possible positions and, therefore, two possible acoustic tunings. Another embodiment may use round shape ear pads and grills to allow virtually infinite variations in acoustic tunings Preferably, for round shape ear pads and grills, alignment pins or other known rotation system with detent is used to limit the free rotation of the ear pads and maintain its position after adjustment. 
     The acoustics of the headphones  1  may be adjusted by rotating the ear pad  10 ,  11  to various positions which will place the multiple openings  9  in the speaker grill  18  in front of the speakers  7  in various communications with the multiple openings  15  in the grill  14  in the ear pad  10 ,  11 . The user may adjust the acoustics to his or her preference and to match the type of audio that is being reproduced by the headphones  1 . 
     The acoustically tunable headphones  1  with its easily removable and replaceable ear pads  10 ,  11  also enables the designer and manufacturer to design and manufacture other replaceable ear pads made of different padding materials and/or with different number and size of openings to enable further acoustical tuning of the headphones and to meet the preference of the user. The user may simply purchase the optional replacement ear pads and change the ear pads easily without any tools to customize it to their preference. 
     Although the invention has been described in terms of particular embodiments and applications, one of ordinary skill in the art, in light of this teaching, can generate additional embodiments and modifications without departing from the spirit of or exceeding the scope of the claimed invention. Accordingly, it is to be understood that the drawings and descriptions herein are proffered by way of example to facilitate comprehension of the invention and should not be construed to limit the scope thereof.