| 摘要 |
An optical alignment method is for a light-emitting module that includes a housing unit, a light-emitting unit disposed in the housing unit, and a lens unit. The optical alignment method includes: (a) through image-capturing techniques, finding a light-emitting point of the light-emitting unit and a predetermined reference point, and determining a total optical path length between the light-emitting point and an imaging plane; (b) finding a first center line that divides the total optical path length in half; (c) through image-capturing techniques, finding opposite first and second edges of the lens unit, and determining a lens length between the first and second edges; (d) finding a second center line that divides the lens length in half; and (e) assembling the lens unit to the housing unit so that the first and second center lines overlap. A light-emitting module and an assembly method therefor are also disclosed.
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