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Waterproof casing
| Details |
Inventors: Kamata, Kazuo; Tasaka, Hisashi; Kubo, Takashi; Kono, Takaji;
Assignee: Fuji Photo Film Co., Ltd. (Kanagawa, JP)
Primary Examiner: Foster; Jimmy G.
Assistant Examiner:
Attorney, Agent or Firm: Young & Thompson
A waterproof casing contains a lens-fitted photographic film unit in a watertight manner so as to take underwater photograph. The waterproof casing is provided with an air flow opening. An air-permeable waterproof sheet is attached to the air flow opening form the inside so that air can pass through the sheet freely so as to regulate the internal pressure of the waterproof casing but water will not enter the waterproof casing. In a preferred embodiment, the waterproof casing consists of a transparent main body with a bottom opening and a bottom lid. The air flow opening is formed os as to be covered by a film winding knob of the waterproof casing. Structure to be fitted in the bottom opening is formed with another air flow opening to which the air-permeable waterproof sheet is attached. Outside this structure is disposed a waterproof sheet having an opening at a position facing the air flow opening of this structure. The waterproof sheet is covered by the bottom lid. |
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DETAILED DESCRIPTION In order to achieve the above and other objects, a waterproof casing according to the present invention is formed with an air flow opening which is shielded on its inner side by an air-permeable waterproof sheet.
The air-permeable waterproof sheet is formed of a thin polymer film and a supporting member laminated on the film and disposed such that the film faces outward.
The film has the property that air passes therethrough but water will not pass therethrough.
On the other hand, both air and water can pass through the supporting member.
The air-permeable waterproof sheet is protected by an operating member of the equipment thus housed, so as not to be torn.
In a preferred embodiment of the present invention, an air flow opening is formed in a portion of a main body covered by an operating member of the housed equipment and is shielded by the air-permeable waterproof sheet.
The air-permeable waterproof sheet may be formed of a polymer film alone, but may also be formed of a polymer film and a supporting member laminated thereon to provide a double-layer construction.
In another preferred embodiment, an air flow opening is formed in a positioning frame for supporting the bottom surface of the film unit, and is shielded by an air permeable waterproof sheet.
A waterproof sheet is positioned under the positioning frame and attached to the bottom of the main body of the waterproof casing.
The waterproof sheet is formed with an opening at a position facing the air flow opening of the air-permeable waterproof sheet.
After a spacer sheet is applied to the waterproof sheet attached to the main body of the waterproof casing, a bottom lid is fitted on the main body.
According to the present invention, the air-permeable waterproof sheet is formed by laminating a supporting member such as a fabric on a thin polymer film, so that the waterproof sheet has sufficient body to be handled with ease.
Furthermore, because the air flow opening is formed in the portion of the main body covered by the operating member or in a portion of the positioning frame and shielded by the air-permeable waterproof sheet, the internal pressure of the waterproof casing can be controlled automatically and the air-permeable waterproof sheet can be protected from damage due to harm from the outside
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Gutter-related 
