Matsushita Electric Industrial Co., Ltd.

Naohiro Shikata

Kaoru Shimizu

Tomio Shiota

Yukio Nishikawa

Akira Takara

Koji Matsunaga

Yoshinori Sakamoto

Keizou Matsumura

Yoshihiko Nishizawa

Mitsuharu Kamikawaji

Yoshiaki Kondou

Takeshi Fujiwaki

There are provided a painted structure of a magnesium alloy molded product having an aesthetic appearance, a painting method of forming the patented structure of the magnesium alloy molded product having an aesthetic appearance, and a casing fabricated using the magnesium alloy molded product. The painted structure of the magnesium alloy molded product has flow marks of which maximum depth is 100 &mgr;m and maximum opening width is 0.5 mm. An anticorrosive film is formed on a surface of the magnesium alloy molded product, and a painted film having an average surface roughness of 10 &mgr;m or more and a thickness of 80 &mgr;m or more is formed on a surface of the anticorrosive film.

Method of manufacturing magnesium alloy molded product, painted structure thereof, method of painting the same, and casings using the same

An article of magnesium or its alloy having a surface layer containing magnesium condensed phosphate and magnesium phosphate, which can be produced by treating an article of magnesium or its alloy with a treating liquid containing 1,000 to 20,000 ppm of alkaline metal ions, 1,000 to 50,000 ppm of condensed phosphate ions, and 100 to 20,000 ppm of borate ions, and having pH of at least 8. The treated article has good corrosion resistance, and a coating can be formed on the surface of the article with good adhesion.

Surface-treated article of magnesium or magnesium alloys, method of surface preparation and method of coating

A casing for 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 and distributing 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 .o slashed.d mm of the tapered fine holes to be practically the smallest, the relationship between the diameter .o slashed.d mm and the thickness T mm of the casing must be expressed by the following formula: (1/6).times.T mm.ltoreq..o slashed.d mm.ltoreq.0.5 mm. When the fine holes are formed to be straight, the relationship between the diameter .o slashed.ds mm and the thickness T mm of the casing must be expressed by the following formula: (1/5).times.t mm .ltoreq..o slashed.ds mm.ltoreq.0.5 mm.

Audiovisual equipment and casing thereof and method of producing the same

A casing for an audiovisual equipment presents 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 and distracting 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 .o slashed.d mm of the tapered fine holes to be practically the smallest, the relationship between the diameter .o slashed.d mm and the thickness T mm of the casing must be expressed by the following formula: (1/6).times.T mm.ltoreq..o slashed.d mm .apprxeq.0.5 mm. When the fine holes are formed to be straight, the relationship between the diameter .o slashed.ds mm and the thickness t mm of the casing must be expressed by the following formula: (1/5).times.t mm.ltoreq..o slashed.ds mm.ltoreq.0.5 mm.

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 .phi.d mm of the tapered fine holes to be practically the smallest, the relationship between the diameter .phi.d mm and the thickness T mm of the casing must be expressed by the following formula: (1/6).times.T mm.ltoreq..phi.d mm.ltoreq.0.5 mm. When the fine holes are formed to be straight, the relationship between the diameter .phi.ds mm and the thickness tmm of the casing must be expressed by the following formula: (1/5).times.t mm.ltoreq..phi.ds mm.ltoreq.0.5 mm.

Method of producing casing for audiovisual equipment

A plurality of dummy bores with bottoms (21) are disposed in the vicinity of through holes (11) defining speaker sound emanating apertures. Each dummy bore (21) has a bottom shaped like a cone or pyramid (23) such that outer light rays (31) becoming incident through the dummy bores (21) are irregularly reflected from the bottom to emerge therefrom as decreased in intensity. With the above arrangement, the through holes (11) and dummy bores (21) may appear less differently from each other. Thus provided is a speaker grille of excellent design.

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Toyono-gun, Japan

Naohiro Shikata