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Underwater zoom switch

  • US 5,089,671 A
  • Filed: 12/15/1989
  • Issued: 02/18/1992
  • Est. Priority Date: 12/15/1989
  • Status: Expired due to Fees
First Claim
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1. A switch arrangement, comprising:

  • a housing having an open end and a closed end to define an interior chamber;

    a degassed, non-compressible, electrically insulating fluid completely filling said interior chamber;

    a flexible, stretchable membrane covering said open end of said housing, said flexible membrane having an inner surface, facing said closed end of said housing, and an opposed outer surface;

    a push-button molding formed on said outer surface of said flexible membrane;

    wherein, when said push-button molding is not depressed, said switch arrangement is in an open state, and, when said push-button molding is depressed in the direction towards said closed end of said housing, said switch arrangement is in a closed state; and

    wherein, when said push-button molding is depressed in the direction toward said closed end of said housing, the fluid under said membrane in the area of said push-button molding is displaced in a direction away from the space between said push-button molding and said closed end, said flexible membrane being expanded in the area surrounding said push-button molding to provide additional volume to accommodate said displaced fluid, said additional volume being equal to the volume of said displaced fluid.

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