Browse Prior Art Database

Ink Jet Stream Sensor

IP.com Disclosure Number: IPCOM000082938D
Original Publication Date: 1975-Mar-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Haskell, JW: AUTHOR

Abstract

Multiple parallel streams of ink jet drops can be successively checked for their presence by using a single light source, a plurality of mirrors and single detector.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 95% of the total text.

Page 1 of 2

Ink Jet Stream Sensor

Multiple parallel streams of ink jet drops can be successively checked for their presence by using a single light source, a plurality of mirrors and single detector.

In the figure, a mirror 1 for each drop stream 2 is secured to a rotatable shaft
3. The mirrors are arranged in a spinal about the shaft. A source 4 directs light along an axis parallel with and adjacent to the shaft 3, so that the beam is successively intercepted by the mirrors 1 as the shaft rotates. Another reflecting surface 5 is supported above the drop streams. Each stream mirror 1 is tilted so that as it intercepts the light beam, the beam is reflected through its respective drop path to surface 5 and back to the surface of the mirror where it is further reflected to optical sensor 6.

Individual stream mirrors 1 are also positioned to overlap each other circumferentially about shaft 3, except for a synchronizing gap between mirrors for the last and first drop streams. During each revolution of shaft 3 the light beam will impinge on sensor 7. Light reflected across the drop paths may be cropped by placing an apertured mask between the streams and mirrors 1.

The illustrated detection arrangement may be further modified by using alternatively individual light sensors for the streams at the location of mirror surface 5, or a light integration rod common to all stream positions with a single sensor, or individual mirrors above the streams each positioned to direct light to a c...