Browse Prior Art Database

Multiple Sensing for Dispenser

IP.com Disclosure Number: IPCOM000117335D
Original Publication Date: 1996-Feb-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 4 page(s) / 95K

Publishing Venue

IBM

Related People

Morita, H: AUTHOR [+2]

Abstract

Disclosed is a method of dispensing liquid material (such as Flux, Silicon, sealing material, paint, and others, including material with viscous property) to monitor and control it's discharging status so that smooth and stable dispensing is guaranteed.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 51% of the total text.

Multiple Sensing for Dispenser

      Disclosed is a method of dispensing liquid material (such as
Flux, Silicon, sealing material, paint, and others, including
material with viscous property) to monitor and control it's
discharging status so that smooth and stable dispensing is
guaranteed.

This invention does the following:
  1.  To perform trial runs before starting the normal dispense
       operation.
  2.  To make sure of the smooth dispensing by performing multiple
       times of trial shots and checking.

CURRENTLY EXISTING METHOD (CONVENTIONALLY USED METHOD)

      The currently existing method (conventionally used method) is
described here, taking Solder Flux at automatic soldering machine as
an example.
  1.  Perform trial shot to check if the flux is certainly dispensed.
  2.  To make sure of the smooth dispensing, use a sensor to see if
the
       dispensing is successful or not.  The following steps are
usually
       employed.
      a.  Determine if the discharge is made or not.  (The weak point
           here is that, even if the discharge is not made, this is
           sensing only.  There is no way to prevent the "not"
           situation.)
      b.  If the discharge is determined to have been made, assuming
           the dispensing is successful, start normal dispensing
           operation.
  The weak points here are:
      c.  Because the determination is based on a single trial shot
and
           the conclusion is either 0 or 1, no stability is meant to
be
           confirmed over a certain period of time.
      d.  Usually, a material like Flux easily gets coagulated.  Even
           after a single shot is confirmed to be successful, there
are
           many cases that the dispensing turns into failure.  The
           conventional method has no way to prevent this situation.
  3.  Instead of the dispenser method employed in the above (1) and
       (2), use a facility expensive enough to have pressure control
       mechanisms and/or viscosity control mechanisms equipped.

NEWLY INVENTED METHOD
  Newly invented method is described below:
  1.  To confirm that multiple times of dispensing is successfully
made
       in a certain period of monitor time.
  2.  To facilitate "Unit time for Single Dispensing", "Count of
trial
       shots", and "Criteria of ready for normal dispense" and make
       these variables adjustable to any desired values.
  3.  "Unit time for Single Dispensing" is the maximum value of the
       time duration required for each dispensing operation.
  4.  "Count of trial shots" is the count of trial shots required
       before the start of normal dispensing.
  5.  "Criteria of ready for normal dispense" is the criteria to
       determine whether the normal dispens...