Focusing device of lamp fitting and variable-focus illumination lamp fitting thereof
A technology for focusing and lamps, applied in lighting devices, fixed lighting devices, lighting and heating equipment, etc., can solve the problem of difficult control of the size of the light spot in the projected area, and achieve the effect of accurate control
Inactive Publication Date: 2013-10-09
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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Problems solved by technology
[0004] The purpose of the embodiments of the present invention is to provide a focusing device for lamps, aiming to solve the problem that the size of the spot in the projected area is difficult to control in the existing variable focus lighting lamps
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[0012] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0013] Generally, a variable-focus lighting fixture includes: a light source assembly, a reflector, and a DC focusing motor whose rotating shaft is connected to the reflector. The DC focusing motor is used to drive the reflector to move parallelly along the central axis of the light source assembly. The focusing device provided by the embodiment of the present invention adopts an energy release circuit to release the induced electromotive force generated by the above-mentioned DC focusing motor, so that when the switch module is disconnected from the DC power supply, the DC focusing motor stops rota...
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The invention provides a focusing device of a lamp fitting and a variable-focus illumination lamp fitting thereof, which are applicable to the field of focusing control of the lamp fitting. The focusing device comprises a DC focusing motor, a switch module, a safety module and an energy release circuit, wherein a rotating shaft of the DC focusing motor is connected with a lamp fitting reflector, the DC focusing motor is used for driving the reflector to do parallel movement in the axle wire direction of a lamp fitting light source assembly, the switch module and the safety module are sequentially connected in series between the DC power supply output end and the power supply input end of the DC focusing motor, the energy releasing circuit is connected between the power supply input end of the DC focusing motor and the ground, when the switch module is switched off, the induced electromotive force generated by the DC focusing motor is released through the energy release circuit, and the DC focusing motor stops the rotation. The focusing device provided by the invention adopts the energy release circuit for eliminating the induced electromotive force generated by the DC focusing motor so that the DC focusing motor is immediately stopped in instant time when the power supply is cut off, the size of the light spot of the reflector can be accurately controlled, and in addition, the invention has the advantages of simplicity and reliability.
Description
technical field [0001] The invention belongs to the field of focusing control of lamps, and in particular relates to a focusing device of a lamp and a variable-focus lighting lamp thereof. Background technique [0002] In some special environments in the prior art, for example, a variable-focus lighting fixture is used on the headlights of a helicopter. The lighting fixture uses a DC focusing motor to drive the reflector to move to change the projection area of the lighting fixture. Usually, a 28V DC focusing motor is used to realize the above functions. [0003] However, due to the particularity of the application environment, the rotation of the motor and the high-speed environment will inevitably generate a certain amount of induced electromotive force, so when the power switch of the lamp is turned off, the induced electromotive force makes the DC focusing motor still maintain the rotating shaft Rotate at a certain angle, and the rotating shaft is connected to the ref...
Claims
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IPC IPC(8): F21V14/04F21S8/00F21W101/06F21W107/30
Inventor 周明杰黄柯青
Owner OCEANS KING LIGHTING SCI&TECH CO LTD