H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 5/64 (2006.01) H04R 1/02 (2006.01) H04R 5/02 (2006.01)
Patent
CA 2116794
A casing for an audiovisual equipment presents an outer appearance giving the impression of integrating a hole area formed of a plurality of sound transmitting fine holes with the casing, thereby making the hole area unnoticeable. This allows a viewer to easily concentrate on the screen by eliminating anything noticeable from the area surrounding the screen, and also gives the outside of the casing a luxurious appearance. In order to make the hole area unnoticeable, maintain good volume and quality of sound from the speaker, and arrange the diameter ~d mm of the tapered fine holes to be practically the smallest, the relationship between the diameter ~d mm and the thickness T mm of the casing must be expressed by the following formula: (1/6) x T mm ~ ~d mm ~ 0.5 mm. When the fine holes are formed to be straight, the relationship between the diameter ~ds mm and the thickness tmm of the casing must be expressed by the following formula: (1/5) x t mm ~ ~ds mm ~ 0.5 mm.
Shikata Naohiro
Shimizu Kaoru
Shiota Tomio
Marks & Clerk
Matsushita Electric Industrial Co. Ltd.
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