Noise-reducing platen
US4453848A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 24, 1982 |
| Grant date | Jun 12, 1984 |
| Priority date | — |
| Expiry date | May 24, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/0446
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A noise-reducing platen comprising a circular cylinder, a hub disposed along the longitudinal axis of and within the cylinder, and walls for dividing the annular region between the cylinder and the hub into a plurality of separated longitudinal channels extending the length of the cylinder. The walls include a plurality of vanes disposed at angular intervals about the hub, each vane extending (a) from the hub to the inner surface of the cylinder and (b) along the length of the cylinder, each pair of adjacent vanes defining one of the longitudinal channels. It is believed that the vibrations generated along the longitudinal channels are at a frequency above the audible range, thereby resulting in reduced undesired noise when printing elements strike the platen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.