Patent US3765504A successfully refreshed from Google Patents.
US3765504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speaker apparatus
Assignee: Sansui Electric Co Ltd
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Filing: 1971-12-06
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Granted: 1973-10-16
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Expires: 1991-12-06
Abstract
Abstract A speaker apparatus has a cabinet and at least one speaker unit secured to the cabinet, and includes at least one board for reflecting sound irregularly and diffusively into a reproducing room from the speaker unit.
Inventors
- 👤 R Itoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:26
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/32; H04R1/34; H04R1/345
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
160 words
In a speaker apparatus including a cabinet and at least one speaker unit, the improvement comprising: means secured to said cabinet for irregularly and diffusively reflecting sound emitted from said speaker to generate a number of indirect sound waves having different wave surfaces, said means for reflecting sound comprising a first substantially semi-cylindrical reflector board having a plurality of planar reflecting surfaces on the interior surface thereof, each planar reflecting surface forming an angle with an adjacent planar reflecting surface of less than 180* to form alternating projections and recesses around the interior of said semi-cylindrical reflector board, and a second reflector board positioned adjacent the end of said semi-cylindrical reflector board opposite said speaker, said second reflector board having curved reflecting surface portions, said first and second reflector boards being disposed in front of said speaker unit to irregularly and diffusively reflect sound emitted from said speaker unit, whereby an improved sound field is created in said speaker apparatus.
Claim 2
Dependent Claim
160 words
In a speaker apparatus including a cabinet and at least one speaker unit, the improvement comprising: means secured to said cabinet for irregularly and diffusively reflecting sound emitted from said speaker to generate a number of indirect sound waves having different wave surfaces, said means for reflecting sound comprising a first substantially semi-cylindrical reflector board having a plurality of planar reflecting surfaces on the interior surface thereof, each planar reflecting surface forming an angle with an adjacent planar reflecting surface of less than 180* to form alternating projections and recesses around the interior of said semi-cylindrical reflector board, and a second reflector board positioned adjacent the end of said semi-cylindrical reflector board opposite said speaker, said second reflector board having curved reflecting surface portions, said first and second reflector boards being disposed in front of said speaker unit to irregularly and diffusively reflect sound emitted from said speaker unit, whereby an improved sound field is created in said speaker apparatus.
Claim 3
Dependent Claim
58 words
The speaker apparatus as specified in claim 1, further comprising a third sound reflecting board having a curved reflecting surface and being mounted above said speaker in a spaced-apart relationship With said first and second reflector boards, wherein the sound waves reflected from said third sound reflecting board are directed toward said first and second sound reflector boards.
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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |