Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Optical Transducer for Ink Jet Printer

IP.com Disclosure Number: IPCOM000083040D
Original Publication Date: 1975-Mar-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 63K

Publishing Venue

IBM

Related People

Cooper, ES: AUTHOR [+2]

Abstract

Optical ink jet drop sensing may be employed for feedback purposes, for example, deriving jet drop stream position from the optical data. In Fig. 1, a focused laser beam 10 scans across one or more ink jet streams 11 at an appropriate speed such that the beam is intensity modulated by the drops. Positional information for the beam 10 is established by a precisely placed precision aperture mask 12. The modulated and masked beam is sensed by a plastic integrating rod and detector 13.

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 100% of the total text.

Page 1 of 2

Optical Transducer for Ink Jet Printer

Optical ink jet drop sensing may be employed for feedback purposes, for example, deriving jet drop stream position from the optical data. In Fig. 1, a focused laser beam 10 scans across one or more ink jet streams 11 at an appropriate speed such that the beam is intensity modulated by the drops. Positional information for the beam 10 is established by a precisely placed precision aperture mask 12. The modulated and masked beam is sensed by a plastic integrating rod and detector 13.

The intensity of the beam is illustrated in Fig. 2, showing the drop modulated portions 14 and the mask modulated portions 15.

The feedback information is detected by the longitudinal integrating detector 13 and the dual-clock detector circuit of Fig. 3. The first clock 16 detects the time required for the beam to scan between predetermined knife edges of the mask, and the second clock 17 detects the time of scan between one edge and the modulation by the stream.

This structure may be used in various ways in combination with the charges applied to the drops to indicate stream position, drop velocity and charge to drop breakoff phase synchronization.

1

Page 2 of 2

2

[This page contains 5 pictures or other non-text objects]