Method for calculating optical scanning locus, and optical scanning device

Abstract

The purpose of the present invention is to provide a method for calculating a scanning locus of light, and an optical scanning device, whereby constraints are not placed on hardware and a high-quality image can be obtained. A first embodiment of this method for calculating a scanning locus of light is characterized by including a step for detecting the resonance frequency and attenuation coefficient of an oscillating part of an optical fiber for guiding light from a light source and emitting the light to a subject, and a step for calculating a scanning locus of the light from the detected resonance frequency and attenuation coefficient. A second embodiment of this method for calculating a scanning locus of light is characterized by including a step for detecting a scanning locus of light from an oscillating part of an optical fiber for guiding the light from a light source and emitting the light to a subject, using position data detected by a scanning position detector, and a step for calculating a function for approximating the temporal change in a phase shift of the oscillating part included in the scanning locus.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to Japanese Patent Application No. 2014-031815 filed on February 21, 2014, and the entire disclosure of the prior application is hereby incorporated by reference. technical field [0002] The present invention relates to a method of calculating a scanning trajectory of light in a scanning endoscope or the like, and an optical scanning device such as a scanning endoscope. Background technique [0003] Conventionally, there is known an optical fiber scanning type observation device that scans light from an output end of an optical fiber toward an object, and detects light reflected, scattered, etc. by the object or fluorescence generated in the object. In such a device, since the irradiated light is scanned on the object, the tip of the optical fiber is supported by a cantilever in a state where the output end of the emitted light can swing, and a piezoelectric element, etc. The drive mechanism, th...

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Problems solved by technology

Especially when the phase deviation θn is generated, there are the following problems: Figure 5 The original image as shown in (a) is Figure 5 As shown in (b), an image in which the central part is twisted in the circumferential direction is formed.

[0010] However, in the invention described in Patent Document 1, since the actual scanning trajectory is acquired by PSD or the like, and all of them are stored in the memory as a lookup table, there is a problem that the storage capacity becomes large and the hardware is constrained.

[0011] Furthermore, in the method described in Patent Document 1, there is also a problem that the coordinate values ​​of the trajectory deviate from the original values ​​due to the influence of electrical noise of the PSD or light reflected by the lens of the scanning optical system.

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