Light source device and its optical path switch

Abstract

The invention discloses a light source device and an optical path switch. The optical path switch includes a power supply, a control component and an execution component, and the power supply, the control component and the execution component are connected to each other. The optical component and the stepping motor connected to it are used to drive its rotation to open or close the optical path. The light blocking component has a fixed end and a movable end, the fixed end is connected to the output end of the stepping motor, and the movable end is along the A certain radial direction extends outward to form a light-shielding part; the stepper motor includes a rotor and at least a first winding and a second winding arranged along a certain circumferential direction outside the rotor, and the control assembly is connected with the first winding and the second winding respectively. connected, by controlling the direction and magnitude of the current in the first winding and the second winding to drive the stepper motor to rotate, thereby driving the light blocking part to block or avoid light. The invention has the advantages of fast switching speed and low power consumption.

Description

technical field [0001] The invention relates to an optical path switch, in particular to an optical path switch and a light source device having the same. Background technique [0002] The optical path switch is generally used in the switch control of the laser beam. By rotating the shutter to the designated position, the beam can be completely turned off, so as to achieve the controllable switch of the beam in the optical path. With the miniaturization of the optical path, the mechanical shutter generally needs to have the characteristics of small size, low noise, fast response, and fast and accurate shutdown. [0003] The optical switch is usually composed of three parts: a light barrier, a stepping motor and a drive circuit. The function of the light blocking sheet is to block light. By fixing the light blocking sheet on the rotor of the stepping motor, when the rotor of the stepping motor rotates, the light blocking sheet is driven to rotate together, thereby realizing ...

AI Technical Summary

Problems solved by technology

It is common that the moment of inertia of the stepping motor rotor of this volume is less than 10 gm^2, while the moment of inertia of the light blocking sheet is greater than that of the stepping motor rotor itself. In this way, when the moment of inertia of the light blocking sheet is too large, the traditional fine The split-drive gait will cause the jitter caused by the inertia to continue to move forward after the light baffle reaches the designated position

For example: for a common 20-step stepper motor that meets the volume requirements (18 degrees for a single step, the torque is about 1mNm), after installing the light barrier, the single-step step time is about 4ms, and the time for two steps to 36 degrees It is about 6ms, but due to the inertia, it will swing back and forth around this angle, and the final stop time is about 100ms. The maximum angle of the initial overshoot can reach more than 18 degrees. Overshoot will affect the light blocking effect. Generally, the mechanical shutter can respond quickly. The shape of the designed light barrier is slightly larger than the spot size, and once the overshoot exceeds 2°-3°, it cannot be turned off, so the traditional subdivision driver cannot be applied to the miniaturized optical path that requires fast optical switches

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