Magnetic driven actuator
A magnetic drive and actuator technology, applied in the direction of magnetic circuits, electric components, electrical components, etc., can solve the problems of increasing the influence of the viscosity of the spring part, difficulty in maintaining attenuation characteristics, hysteresis, etc.
Inactive Publication Date: 2008-02-13
NHK SPRING CO LTD
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Problems solved by technology
However, when the damping effect is increased by adhering a viscoelastic material to the spring, there is a problem that the influence of the viscosity of the spring part increases, the responsiveness at the time of driving decreases, and a hysteresis phenomenon occurs.
In addition, the attenuation characteristics of the above-mentioned acrylic and silicon change significantly depending on the temperature (the characteristics change greatly before and after the glass transition temperature), so it is difficult to maintain a stable attenuation characteristic in a change from cold to hot environment such as an automobile. question
Method used
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Embodiment Construction
[0062] Embodiments of the present invention will be described below with reference to the drawings.
[0063] 1 is a perspective view showing a laser scanning actuator used in a scanning type vehicle-mounted laser radar device for collision prevention of a vehicle to which the present invention is applied. 2 is a plan view showing an actuator for laser scanning, FIG. 3 is a side view viewed from arrow III in FIG. 2 , and FIG. 4 is a disassembled and assembled perspective view of main parts. In addition, regarding the laser scanning actuator of the illustrated example, the directions of front and rear, up and down, and left and right are indicated by the arrows in FIG. Be explained.
[0064] This laser scanning actuator has: a fixed base 1 as a fixed part, which is fixed on a vehicle body (vehicle frame) not shown in the figure; a rectangular frame-shaped coil support body 3 as a movable support part, which is Four displacements in the up and down directions as a cantilever su...
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The invention provides a magnetic drive actuator. In order to improve the attenuation effect of the magnetic drive actuator when the external disturbance is input, the auxiliary coil (26) is connected in parallel with the driving coil (11) installed on the movable part to form an electrical circuit. Resonance circuit to exert the damping effect of induced electromotive force in the case where the movable parts (coil support, lens holder) supported by the leaf spring are displaced due to external disturbance, so that its resonance frequency is resonated with that of the spring-mass system The frequencies are roughly the same. The driving frequency is in a low frequency band away from the resonance frequency, so that it will not have any influence on the driving characteristics, and can exert a greater damping force on the resonance generated by external interference input, which can reduce the impact of external interference on the lidar device. Affected by light control, good scanning characteristics can be obtained.
Description
technical field [0001] The present invention relates to magnetically driven actuators that reduce the effect of external disturbing vibrations. Background technique [0002] Conventionally, scanning laser radar devices, laser scanners, laser printers, laser pointers, object monitoring devices, and the like are known as scanning devices using laser light. Among them, for example, in the vehicle-mounted laser scanning actuator used in the scanning laser radar device for vehicle collision prevention, there is a lens holder holding a lens through which the laser light passes, and the lens holder is driven by a magnetic circuit. It is spring-supported so as to be displaceable in the up, down, left, and right directions of the vehicle with respect to the optical axis, and scans the laser light. [0003] The above-mentioned scanning laser radar device for vehicle collision prevention needs to be less susceptible to vibrations generated by external disturbance input to the vehicle....
Claims
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IPC IPC(8): H02K33/00
CPCH02K2201/18H02K41/0356
Inventor 冨永润松本敦夫古川和夫
Owner NHK SPRING CO LTD