The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 23, 1992
Filed:
Jul. 19, 1990
Masaki Denda, Tokyo, JP;
Seiko Instruments, Inc., Tokyo, JP;
Abstract
An ink jet recording apparatus composed of a print head of the on-demand type for ejecting an ink droplet according to print data and a platen having a flat section opposed to the head and extending at least over a region corresponding to a printing span through which the head is displaced to effect printing. The flat section of the platen is formed with a plurality of opening holes each having a relatively small diameter. A vacuum device creates a vacuum beneath the platen to attract a recording medium onto the flat section to enable the recording medium to receive ink droplets ejected from the head so as to print an image. The dimensions or the density of the opening holes is gradually reduced so as to compensate for differences in width of the recording media to thereby effectively avoid floating of a medium.