Other features and advantages of the present invention will become apparent in the following detailed description of the preferred embodiments with reference to the accompanying drawings, of which:
Before the present invention is described in greater detail with reference to the accompanying preferred embodiments, it should be noted herein that like elements are denoted by the same reference numerals throughout the disclosure.
Referring to
The focus-adjustable LED flashlight 200 is adapted for receiving a battery unit therein. In this embodiment, the battery unit includes a battery 11. However, the battery unit may include a plurality of batteries 11 according to actual requirements.
The positive lens 41 can be a plano-convex or a biconvex lens, and is preferably a plano-convex lens.
The tubular housing 21 has an end face 210. The LED light-emitting unit 5 includes a circuit board 51. The sleeve unit 3 includes a first sleeve 32 engaging threadedly the tubular housing 21, a second sleeve 31 engaging threadedly the first sleeve 32, and an urging member 42. The circuit board 51 is urged by the urging member 42 toward the end face 210 of the tubular housing 21 to press against a first O-ring 63. The positive lens 41 covers a front opening 311 of the second sleeve 31. The second sleeve 31 is formed with an inner shoulder 313 such that, when the positive lens 41 is disposed in the second sleeve 31, the positive lens 41 is urged by the urging member 42 toward the inner shoulder 313 to press against a second O-ring 61 for positioning purposes.
The LED light-emitting unit 5 further includes an LED 52 mounted on the circuit board 51 and facing the positive lens 41.
The sleeve unit 3 further includes an abutting member 62 that has a ring portion 621 and a flange portion 622 extending radially from the ring portion 621 and urged by the urging member 42 toward the inner shoulder 313 to abut against the positive lens 41. In this embodiment, the urging member 42 is in the form of a compression spring that is sleeved on the ring portion 621.
The tubular housing 21 is formed with an outer thread 211. The first sleeve 31 is formed with an inner thread 321 for engaging threadedly the outer thread 211. The inner thread 321 has an axial length less than that of the outer thread 211.
The focus-adjustable LED flashlight 200 further includes an enclosure unit 22 operable to be mounted on a rear end of the tubular housing 21. The enclosure unit includes an enclosure body 223, a switch 221 mounted at a rear end of the enclosure body 223, and a spring 222 mounted at a front end of the enclosure body 223 for biasing the battery unit toward the circuit board 51 of the LED light-emitting unit 5.
Referring to
With the inclusion of the positive lens 41 and the sleeve unit 3 in the focus-adjustable LED flashlight of this invention, the aforesaid drawback associated with the prior art can be eliminated.
While the present invention has been described in connection with what are considered the most practical and preferred embodiments, it is understood that this invention is not limited to the disclosed embodiments but is intended to cover various arrangements included within the spirit and scope of the broadest interpretation so as to encompass all such modifications and equivalent arrangements.
Number | Date | Country | Kind |
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095134204 | Sep 2006 | TW | national |