Scanning actuator, optical fiber scanner and driving method

Abstract

The invention discloses a scanning actuator, an optical fiber scanner and a driving method. The scanning actuator is a quartered piezoelectric tube, the scanning actuator comprises a first actuating part and a second actuating part, and at least one inherent frequency related parameter of the first actuating part body is different from that of the second actuating part body. The inherent frequencyrelated parameters comprise a value and / or a length value of the first actuating part body / the second actuating part body, wherein I is the inertia moment of the cross section of the first actuatingpart body / the second actuating part body cut by a plane perpendicular to the axis of the quartered piezoelectric tube, A is the area of the cross section, and the inherent frequency of the first actuating part body / the second actuating part body is in direct proportion to the value and in inverse proportion to the length value. The scheme is used for reducing the inherent frequency of the slow axis or increasing the inherent frequency of the fast axis, so that the inherent frequency of the fast axis / slow axis is close to the corresponding driving frequency, and the amplitude of the fast axis / slow axis is increased.

Description

technical field [0001] The invention relates to the field of scanning imaging, in particular to a scanning actuator, an optical fiber scanner and a driving method. Background technique [0002] The imaging principle of optical fiber scanning projection technology is to drive the scanning optical fiber through the optical fiber scanner to move the predetermined two-dimensional scanning trajectory, and modulate the light output of the light source, that is, modulate the light corresponding to each pixel of the image to be displayed, and then, through the scanning optical fiber The light corresponding to each pixel of the image to be displayed is projected onto the projection screen one by one, thereby forming a projection screen. [0003] In the current field of fiber optic scanners, piezoelectric ceramic tubes are often used as scanning actuators. Such as Figure 1A and Figure 1B As shown, it includes a piezoelectric ceramic tube 1 and a first electrode pair 001 , a second...

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Problems solved by technology

[0004] Since the driving frequency of the helical scanning in the two directions is basically the same, the above piezoelectric ceramic tube 1 is suitable for driving the optical fiber to perform helical scanning. If the above piezoelectric ceramic tube 1 is used to drive the optical fiber to perform Lissajous scanning or grid scanning , because both Lissajous scanning and grid scanning require the scanning actuator to have different driving frequencies in the two scanning directions, the traditional piezoelectric ceramic tube 1 has the problem that the natural frequency and driving frequency cannot match, resulting in two direction can not reach the maximum amplitude

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