QUALITY ASSURANCE
---------------------
for
test, experiments, and calculations
to
confirm
the design changes.
deSign, as described
in
section 2.
Our
views
on
quality
approval are:
(7) Analysis
of past failures
with
similar devices, dis-
cussion
of
methods
to
prevent them, and planning
and execution
of test programs
to
confirm success.
(1) A third party executes approval
objectively
from
the standpoint of the customer.
3.
QUAUTV
ASSURANCE
SYSTEM
3.1
Activity
of
Quality Assurance
(2) Full consideration is given
to
past failures and
information from the field.
(3) No
deSign change
or
process change
without
QA
approval.
General views
of overall quality assurance
in
Hitachi
are as
follows:
(4) Parts, materials, and processes
are
closely
monitored.
(1) Problems in each individual process should be
solved
in
Jhe
process. Therefore, at the finished
product stage
the
potential failure factors have
been removed.
(5) Control points are established
in
mass production
after studying the process abilities and
variables.
3.3
Quality
and Reliability
Control
at
Ma
..
Production
(2) Feedback
of
information is used
to
insure a satis-
factory level of ability process.
Quality control is accomplished through division
of
functions
jn
manufacturing, quality assurance,
and
other related departments. The total function
flow
is
shown
in
Fig. 2. The main points are described below.
3.2
Quality
Appl'OVl!ll
To
insure quality and reliability, quality approval is
carried out at the preproduction stage
of
device
Step
Contents
t
Terget
I
Design Review
Specification
•
I Design
Characteristics
of
Material and
Trial
Material., Parts
II
Parts
Production
Approval
H
Appearance
Dimension
Heat R
..
istance
Mechanical
Electricel
Othan
ICharsctarlstlcs Approval
Electrical
Characteristics
Function
Voltage
Currant
Temperature
Others
Appearance,
Dimension
I~uality
ApprovaII1J
Reliability
T
..
t
Life T
..
t
Thermal Stress
Moisture
R
..
istance
Mechanical Stress
Others
19ualit-;«
Approval
~~
Reliability T
..
t
~
Process Check
..
me
..
Quality Approval
(1)
I=uctlon
I
Figure 1
Flow Chart
of
Quality
Approval,
20
Purpo
.•
Confirmation
of
Characteristics end
Reliability
of
Materials
and
Paru
I Confirmation
of
Tlfllt
Spec. Mainly
about
Electrical Characteristics
Confirmation
of
QUality
and
Reliability
In
Delign
I Confirmation
of
Quality
end Rallability in
MIll
Production
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