Browse Prior Art Database

Automatic Tape Cartridge Feeder Sensor Design

IP.com Disclosure Number: IPCOM000116633D
Original Publication Date: 1995-Oct-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 6 page(s) / 117K

Publishing Venue

IBM

Related People

Hu, PY: AUTHOR [+2]

Abstract

Disclosed is the design of an array of optical sensors to detect the presence and absence, and movement of an opaque magnetic tape cartridge in an Automatic Tape Cartridge Feeder (ACF) to: 1. Detect the presence and absence of an opaque cartridge in a very long span of distance, for example 4-18 inches. 2. The detection of the presence and absence of a cartridge magazine. 3. The detection on the new and used cartridge position. 4. The detection of cartridge within the elevator transport. 5. The detection of cartridge at different elevator position. 6. The bicolor lighting for cartridge status indication.

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This is the abbreviated version, containing approximately 53% of the total text.

Automatic Tape Cartridge Feeder Sensor Design

      Disclosed is the design of an array of optical sensors to
detect the presence and absence, and movement of an opaque magnetic
tape cartridge in an Automatic Tape Cartridge Feeder (ACF) to:
  1.  Detect the presence and absence of an opaque cartridge in a
very
       long span of distance, for example 4-18 inches.
  2.  The detection of the presence and absence of a cartridge
       magazine.
  3.  The detection on the new and used cartridge position.
  4.  The detection of cartridge within the elevator transport.
  5.  The detection of cartridge at different elevator position.
  6.  The bicolor lighting for cartridge status indication.

      To operate an automatic cartridge feeder in a random mode under
system command, we must know the positions and locations of the
cartridge at any time.  The principal elements to be able to
successfully sense/detect/locate the cartridges are:
  1.  The cartridge casing must be opaque to infrared light.
  2.  Optical sensors and indicators employed at every location
       in the ACF.

      To accomplish the above objectives, we have designed and
selected a totally opaque black cartridge.  The black opaque
cartridge is less expensive and can use recycled material and is
found to be totally opaque to infrared light, thereby greatly
facilitating the sensing and detection of the
presence/absence/location
of the cartridge in the ACF.

      This invention relates to methods to locate and indicate
cartridge locations with LED sensors.  There are principally three
different optical sensors types:
  1.  Reflective type
  2.  Interruptive (local)
  3.  Remote interruptive.

In the ACF design, we have chosen the following specific types to
achieve optimum design and function goals.
  1.  Global Sensor - The distance needed to sense the presence of at
       least one cartridge requires the use of a remote LED emitter
and
       detector pair utilizes 38 khz modulation in a 600 use burst
mode
       in order to be able to detect the presence of at least one
       cartridge.  This method of detection enables us to detect the
       presence of at least one cartridge when it is being inserted
into
       the new cartridge position.  This method of sensing is not
       sensitive to ambient lighting conditions.
  2.  New and Used Cartridge Positions in the Cartridge Magazine -
       Because of the differen...