Specifications

MIL-STD-1472E
5.4.3.2.7 LiEhtt)en.
5.4.3 .2.7.1 Use. Alight penmaybe usedasa track-oriented readout devke. (Itmaybe
positioned on the d~ay screen to detect a computer-generated track by sensing its refresh pattern; the
display system will then present a follower (hook) on the designed track. With suitable additional
cimuitry, a follower can be made to track the movement of the light pen across the screen surface, thus
allowing itto function as a twmaxis controller capable of serving the same purposes as the grid and
stylus devices of 5.4.3 .2.5,1.)
5.4.3 .2.7.2 DynamI
“ccharacteristics. When used as a two-axis controller, light pen dynamic
characteristics shall conform to paragraph 5.4.3.2.5.2.
5.4.3 .2,7.3 Di~sions and mounting.
The tightpenshallbe 120- 180mrn(4.7 -7.1 in)long
with a dkuneter of 7-20 mm (0.3 -0.8 in).
A convenient clip shall be provided at the lower right side
of the CRT to hold the light pen when it is not in use.
5.4.3.2.8
PedaJs.
5.4.3 .2.8.1 ~. Pedal controls should be used only where the operator is likely to have both
hands occupied when control operation is required, control system force is too high for manual force
capability of the operator, or standardized use of pedals has created a stereotype expectancy (e.g.,
vehicle pedal controls such as cIutches, brakes, accelerators, and xuddcrs).
5.4.3 .2.8.2 Imcation. Pedal controls shall be located so that the operator can nmch them easily
without extreme stretching or torso twisting and can teach the maximdlydispkiced pedals within
anthropometric limits and force-capabilities (see Figure 20). Pedals that may be held or must be
adjusted(e.g., accckrator, clutch) shall be located so the operatorcan “rest”and “steady”the foot,
i.e.,the pedal shall bean appropriatecriticaldistanceabove the floorso the operator’sheelcan reston
the floorwhile articuhttingtheankldfoot. Whenthiscannot bedone(and thepedalangle ismorethan
20° fromthe horizontalfloor,a
heel rest shail be provided.
5.4.3 .2.8.3 Control return. Except for controls which generate a continuous output (e.g.,
rudder controls) pedals shall return to the original
null position withoutrequiringassistancefmn the
operator(e.g.,brake pedal). Wherethe operator’sfoot
may normally mat on the pedalbetween
operations, suffkient resistance shall be provided to pnxent the weight of the foot horn inadvertently
actuating the control (e.g., accelerator pedal).
5.4.3 .2,8.4 R&I travel path The travel path shall be compatible with the natural articulation
path of the operator’s Iimbs (i.e., thigh, knee, ankle).
5.4.3 .2.8.5 Hkh force a~lication aids. When high fomes are required to fully actuate a pedal,
appropriate aids
shtdlbe provkkd to assistthe qeratur m applyingmtximwn
fbrcc,
e.g., (a) seat
bac~@)d_-titi~ wti W~~&*, (a)~-_a~d
nonmdreaeh distanee formaxinwm force, where theseat mkmncepointandpedalarea tthesaxne
height and math distance is configured so the angle between the upper thigh and lower leg is
approximately 160° (see F@re 22).
5.4.3 .2.8.6 Non-slippe
dal surface. Pedals used for high force applications shall be
provdecl
with a rmn-skid surface. Similar surfaces arc desirable for all pedals.
5.4.3.2.s.7 Q&&Qs
ions.resistnncr,
ctisplfwmn! and sqmration. Dimensions. resistance.
displacement and separation of pedals shall conform to
the cntena mFigure 20.