Honda CB160 Shop Manual page 114

110
5.
ELECTRICAL PARTS
fig. 5. 104
Head lamp
A
B
DUST SEAL
Fig. 5. 105
Construction of head lamp
\ \ ti
-,=m=- ~EXPRESSES HIGH BEAM LIGHT FLOX
----EXPRESSES
LOW
BEAM IIGHf FLUX
Fig.
5. 106 Principle of the head lamp !light beam)
VERTICAL SECTION OF LENS
HORIZONTAL SECTION OF LENS REFRACTION OF
VERTICAL BEAM
fig.
5.
107 Principle of head lamp Uensl
F. Head lamp
The head lamp is one of the most important items
of equipment ·for safe night driving. The following
conditions should be considered carefully. (Refer to
Fig-:
5. 104)
l . The beam should be of sufficient intensity and
should distribute the light over a sufficiently wide
area.
2. The head lamp should be able to resist .vibration
and shock.
3. It should be of dust and waterproof construction.
4. When passing oncoming traffic,
it
should not blind
the other driver.
Head lamp construction is classified by the fol-
lowing types :
I • Type in which disassembly is possible. (Refer to
Fig.
74 A)
2. Semi-sealed. (Refer to Fig. 5. 7 4 B)
3. Sealed.
Reflector lens, and bulb determine the performance
of the head lamp. All are equally important. The
reflector positions the bulb filament at the focus on
the rotating parabolic surface and the reflected beam
is level. If the position of the filament does not
match the focus when the bulb is fitted to the reflec-
tor, the intensity of the beam is greatly decreased.
The shape and size of the filament affects the light
distribution. Specified bulbs should be used for the
head lamp. (Refer to Fig. 5.106)
As shown in .Fig. 5.107, the cross-section of the
head lamp is wave--.shaped and the lower part is
thicker. The light is spread horizontally, and refract-
ed downward to illuminate the road surface. When
the bulb is installed, the extensions in the base of
the bulb should be inserted in the depression of the
reflector rib. If this is not done, the center of the
fillament does not match the focus of the reflector
and in a bulb with a double filament the difference
between high and low beams is lost. (Disassembly
and semi-sealed type! (Refer to Fig. 5. I 07)