초록 ▼

This invention relates to a media weight sensor of the type that includes a transducer consisting of a metal desk with a piezoelectric element fabricated by one side which form the back of a Helmholtz resonator cavity mounted in a printer so that the media going to the printer moves across the top o

This invention relates to a media weight sensor of the type that includes a transducer consisting of a metal desk with a piezoelectric element fabricated by one side which form the back of a Helmholtz resonator cavity mounted in a printer so that the media going to the printer moves across the top of the Helmholtz resonator where an opening of the resonator is located. A soft, polymeric roller is used to press for media and is the transducer. The resonant frequency of the Helmholtz is affected by the media. The mass of the media adds to the mass of the resonator, thereby lowering the resonant frequency. Consequently, the heavier than media, the more the resonant frequency is lowered.

대표청구항 ▼

1. A media weight sensing apparatus, comprising:a Helmholtz resonator means having an opening substantially located in one end of the resonator means and a media weight measuring means operatively connected to the other end of said resonator means, wherein said resonator means is further comprised o

1. A media weight sensing apparatus, comprising:a Helmholtz resonator means having an opening substantially located in one end of the resonator means and a media weight measuring means operatively connected to the other end of said resonator means, wherein said resonator means is further comprised of; a resonator housing, a piezoelectric means operatively connected to said resonator housing, and a disk means operatively connected to said piezoelectric means; and a media traversing means for traversing the media, whose weight is to be determined, across said opening in said resonator means.