Diving mask and viewfield lens therefor
AssigneesHit Design Ltd., Apollo Sports Co., Ltd.
InventorsKazumi Matsumoto, Tetsuo Yoshizawa
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Abstract
The diving mask is capable of suitably restraining abnormal image vision and which can be precisely produced at low cost. The diving mask of the present invention comprises a viewfield lens, which is constituted by a flat front section and side sections extended from the front section. The side sections are formed like toric faces, and the side sections respectively have Fresnel lens parts capable of correcting negative refracting power under water.
Claims8
A diving mask comprising a viewfield lens, which is constituted by a flat front section and side sections extended from the front section,
- wherein the side sections are formed like toric faces, and
- the side sections respectively have Fresnel lens parts capable of correcting negative refracting power under water.
A viewfield lens for a diving mask,
- comprising:
- a front section;
- and
- side sections extended from the front section,
- wherein the side sections are formed like toric faces, and
- the side sections has Fresnel lens parts capable of correcting negative refracting power under water.
Dependencies are inferred from the claim text.