| 摘要 |
A method for adjusting a focus of a flash light includes the steps of (a) providing a hollow housing having a front end, and a rear end to define a fixed length from the front to rear end, (b) coaxially supporting a lens at the front end of the housing, and a light source behind the lens, and (c) movably actuate a light adjustor of the light arrangement at the housing between the front and rear ends thereof to selectively adjust a distance between the lens and the light source along a longitudinal axis of the housing for adjusting the focus between the lens and the light source without altering the fixed length the housing, so as to adjust an illumination angle of the light beam.
|
