US4646872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Earphone
Assignee: Sony Corp
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Filing: 1985-10-30
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Granted: 1987-03-03
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Expires: 2005-10-30
Abstract
Abstract An earphone having a housing, a speaker unit accommodated in the housing and a duct formed in the housing to pass sound emanated from the rear surface of the speaker unit and in which a mesh subjected to water repellent treatment is provided within the duct.
Inventors
- 👤 Yoshiyuki Kamon
- 👤 Makoto Yamagishi
- 👤 Shingo Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:09
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/225
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
106 words
An earphone comprising: a housing having a front facing opening, a speaker unit having front and rear portions mounted in said housing with the front of the speaker positioned in said opening; a back cavity in said housing formed between a rear portion of said speaker unit and said housing, and a duct acoustically coupled to said back cavity to imprive the lowest resonance frequency, said duct comprising an opening through said housing by which said back cavity and the rear outside of said housing communicate with each other, said duct being provided with a mesh thereacross which passes acoustical sounds but limits passage of water.
Claim 2
Dependent Claim
106 words
An earphone comprising: a housing having a front facing opening, a speaker unit having front and rear portions mounted in said housing with the front of the speaker positioned in said opening; a back cavity in said housing formed between a rear portion of said speaker unit and said housing, and a duct acoustically coupled to said back cavity to imprive the lowest resonance frequency, said duct comprising an opening through said housing by which said back cavity and the rear outside of said housing communicate with each other, said duct being provided with a mesh thereacross which passes acoustical sounds but limits passage of water.
Claim 3
Dependent Claim
16 words
An earphone according to claim 1 in which said mesh is treated with a water repellent.
Claim 4
Dependent Claim
20 words
An earphone according to claim 1 or 2 in which said mesh is of 100 to 200 meshes per inch.
Claim 5
Dependent Claim
46 words
An earphone according to claim 1 including a further plurality of rear facing openings in said housing adjacent the periphery of the speaker unit communicating with the rear outside of the housing, each of said rear facing openings having water repellent acoustics damping means positioned therein.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-02 | 1990-09-01 | 1991-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-02 | 1994-09-01 | 1995-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-02 | 1998-09-01 | 1999-03-03 | $7700.00 | Window Closed / Lapsed |