Browse Prior Art Database

Value Engineering VDU Covers

IP.com Disclosure Number: IPCOM000112464D
Original Publication Date: 1994-May-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 4 page(s) / 106K

Publishing Venue

IBM

Related People

Hillary, C: AUTHOR [+2]

Abstract

Disclosed is a clamshell design of VDU covers which eliminates traditional chassis and EMC shielding. Also reduced is interior heat build-up by lowering outward flow impedances. Assembly time and part numbers area also reduced. Two interlocked metal covers efficiently conduct away heat whilst integrating the combined functions of conventional card tray, full metal jacket, video EMC shield and various metal fastenings.

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Value Engineering VDU Covers

      Disclosed is a clamshell design of VDU covers which eliminates
traditional chassis and EMC shielding.  Also reduced is interior heat
build-up by lowering outward flow impedances.  Assembly time and part
numbers area also reduced.  Two interlocked metal covers efficiently
conduct away heat whilst integrating the combined functions of
conventional card tray, full metal jacket, video EMC shield and
various metal fastenings.

      This is a design comprising a die cast light alloy cover set
Fig.  1.  for displays, replacing the thermo plastic injection
moulded covers used in the current products.  By using a metal cover,
e.g., magnesium alloy, there is no significant change in weight and
the cover performs several other functions - hence the term Value
Engineering Covers.  The main advantages are as follows:

o   The cover set provides the EMC shielding and eliminates the need
    for a separate chassis or card tray, full metal jacket and video
    card shield or sprayed metal coatings.

o   The cover set has high thermal conductivity and can be used as a
    basic heatsink or as an extension to less expensive heatsinks
    used in the display circuitry.

o   As internal chassis and shielding are eliminated, the ventilation
    airpath impedance drops, which improves cooling and reliability.

o   Other features such as CRT location and retaining lugs and bosses
    can be cast integrally in the covers eliminating the need for
    fasteners.

      The design concept is to cast two cover halves Fig. 2.  (a
bottom half 1 and a top half 2).  Unlike present products, the split
line 3 between both cover halves is horizontal and positioned
approximately in line with the CRT axis though not essential.  A
separate bezel and rear cover are eliminated.  By casting the covers
in this way it is possible to provide mounting features at low cost
for the internal components and cast features such as a dividing
screen wall 5 between the analog/pwr section and video PCB6 section
and heatsinks 8; also fans and/or bosses.

      Major components are loaded into the lower half in the
suggested order: (i) controls and indicators 9, (ii) Main PWR/AN
PCB10, (iii) ITC with video card 6.  After final as...