Honda CB125 CB160 (1972) [116/139] Refer to fig 5 06

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110 5 ELECTRICAL PARTS 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 Figr 5 104 1 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 Fig 5 104 Head lamp 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 1 Type in which disassembly is possible Refer to Fig 74 A 2 Semi sealed Refer to Fig 5 74 B 3 Sealed Fig 5 105 Construction of head lamp 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 Fig 5 106 Principle of the head lamp light beam 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 5 107 Fig 5 107 Principle of head lamp Uensl

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