Headphone comfort

• US 4,922,542 A
• Filed: 12/28/1987
• Issued: 05/01/1990
• Est. Priority Date: 12/28/1987
• Status: Expired due to Term

• Current Assignee: Bose Corporation
• Original Assignee: Bose Corporation
• Inventors: Sapiejewski, Roman
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): Byrd, Danita R.
• Application Number:
  US07/138,095
• Time in Patent Office: 855 Days
• Field of Search: 381/183, 381/187, 381/168, 181/129, 181/130, 181/135, 181/198
• US Class Current: 381/373
• CPC Class Codes: G10K 11/17857 Geometric disposition, e.g. placement of microphones
• CPC Class Codes: G10K 11/17861 using additional means for damping sound, e.g. using sound absorbing panels
• CPC Class Codes: G10K 11/17875 using an error signal without a reference signal, e.g. pure feedback
• CPC Class Codes: G10K 11/17885 additionally using a desired external signal, e.g. pass-through audio such as music or speech
• CPC Class Codes: G10K 2210/1081 Earphones, e.g. for telephones, ear protectors or headsets
• CPC Class Codes: G10K 2210/3026 Feedback
• CPC Class Codes: G10K 2210/3217 Collocated sensor and cancelling actuator, e.g. "virtual earth" designs
• CPC Class Codes: H04R 1/1083 Reduction of ambient noise active noise reduction per se G10K11/175; protective devices for the ear, e.g. providing acoustic protection A61F11/06
• CPC Class Codes: H04R 3/002 Damping circuit arrangements for transducers, e.g. motional feedback circuits

Abstract

A baffle, which supports a driver for converting an input electrical signal into an acoustical output signal, is mounted to a headphone cup via a first cushion which sufficiently spaces the baffle from an outer ear to avoid contact. The baffle defines a front cavity and a rear cavity. A second cushion which forms an oval opening large enough to encompass the outer ear is mounted on the headphone cup for establishing an air seal between the front cavity and a region outside the headphone cup.

Claims

1. Headphone apparatus comprising,

a baffle,

a driver supported by said baffle for converting an input electrical signal into an acoustical output signal and having a vibratile diaphragm with a front and a rear,

a structure bounding a front cavity receiving acoustic energy from the front of said diaphragm and said structure bounding a portion of a rear cavity which rear cavity is for receiving acoustic energy from the rear of said diaphragm,

said structure comprising means for controlling the transmission of acoustic energy between said rear and front cavities,

a headphone cup attached to said structure and bounding the remainder of said rear cavity and comprising means for controlling transmission of acoustic energy between the diaphragm rear and air outside said apparatus,

and a cushion having an opening large enough to encompass the outer ear, mounted on the headphone cup for establishing a seal between the front cavity and a region outside said apparatus.

2. Headphone apparatus in accordance with claim 1 wherein said means for controlling comprises a port in said headphone cup for allowing air outside the headphone apparatus to communicate with the rear cavity for resonating with the compliance of air in the rear cavity.

3. Headphone apparatus in accordance with claim 1 wherein said cushion is a double annulus circumaural cushion.

4. Headphone apparatus in accordance with claim 1 wherein the front cavity is sufficiently isolated from the rear cavity to avoid cancellation of low frequencies radiated by the diaphragm into the front cavity.

5. Headphone apparatus in accordance with claim 3 wherein said cushion comprises highly compliant foam that is self-skinned.

6. Headphone apparatus in accordance with claim 4 wherein said cushion comprises highly compliant foam in a thin plastic film.

7. Headphone apparatus in accordance with claim 1 and further comprising,

electroacoustical transducing means closely adjacent to said driver in said front cavity for transducing an acoustical pressure signal into a corresponding transduced electrical signal and located near the ear canal entrance so that said transducing means is responsive to the pressure in the front cavity near the ear canal entrance.

8. Headphone apparatus in accordance with claim 7 wherein said means for controlling comprises a port in said headphone cup for allowing air outside the headphone apparatus to communicate with the rear cavity for resonating with the compliance of air in the rear cavity.

9. Headphone apparatus in accordance with claim 7 wherein said cushion is a double annulus circumaural cushion.

10. Headphone apparatus in accordance with claim 8 wherein the front cavity is sufficiently isolated from the rear cavity to avoid cancellation of low frequencies radiated by the diaphragm into the front cavity.

11. Headphone apparatus in accordance with claim 9 wherein said cushion comprises highly complaint foam that is self-skinned.

12. Headphone apparatus in accordance with claim 10 wherein said cushion comprises highly compliant foam in a thin plastic film.

13. Headphone apparatus in accordance with claim 1 wherein said cushion is characterized by a high acoustic impedance at low frequencies and a low acoustic impedance at high frequencies and wherein,

the structure is comprised of a material that is highly absorptive at high frequencies and essentially transparent to low frequency enegy.

14. Headphone apparatus in accordance with claim 7 wherein said cushion is characterized by a high acoustic impedance at low frequencies and a low acoustic impedance at high frequencies and wherein,

the structure is comprised of a material that is highly absorptive at high frequencies and essentially transparent to low frequency energy.