3D Measuring Device Reference Light Optical System
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional 3-dimensional measuring devices require a shutter switching operation for radiating and receiving range-finding light, which limits their ability to achieve a wide measuring range due to the need for internal reference light adjustment, and the electrical characteristics of conventional shutters hinder high-speed switching and axis adjustment.
Innovation Solution
A 3-dimensional measuring device that eliminates the need for shutter switching by using a reference light optical system positioned outside the measuring range, which changes the light quantity of internal reference light independently, allowing for a wide measuring range without axis adjustment, utilizing a density variable filter and reflecting sheet to adjust light quantity and avoid axis alignment issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional shutter with electronic mechanism is used for switching between optical paths, then the device can perform shutter switching operation, but the switching speed is limited and axis adjustment takes considerable time
Solution Approach 1:
The patent extracts the reference light acquisition function from the main measurement optical path and places it in a separate reference light optical system positioned outside the monitored angular scanning range. This eliminates the need for shutter switching between measurement and reference light paths, removing the bottleneck caused by conventional electronic shutters and their axis adjustment requirements.
Solution Approach 2:
The patent introduces a retroreflector as an intermediary element in the reference light optical system. The retroreflector automatically returns reference light to the light receiving element without requiring precise axis alignment or electronic control mechanisms, thereby eliminating shutter switching operations and their associated time losses.
2Ease of operation
If the reference object is disposed outside the monitored angular scanning range, then shutter switching operation is not necessary, but the degree of attenuation changes continuously and a wide scanning range is required which narrows the measured angular scanning range
Solution Approach 1:
The patent applies local quality by positioning the reference light optical system at a specific location outside the monitored angular scanning range where reference light can be acquired without interfering with measurement. The retroreflector is placed at a fixed position that provides stable reference light return without requiring continuous attenuation adjustment or wide scanning range.
Solution Approach 2:
The patent changes the parameter of reference light acquisition by using a retroreflector instead of a rotating reference object with attenuation filter. This eliminates the need for continuous attenuation adjustment and allows the system to maintain a wide measured angular scanning range while still providing stable reference light for timing calibration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the elimination of shutter switching operations, allowing for a wider measuring range while reducing the time and effort required for axis adjustment, and maintaining consistent light quantity regardless of scanning direction.
Implementation Method 1
The 3-dimensional measuring device radiates pulsed laser beams to a measurement target as a range-finding light
Implementation Method 2
a scanning mirror that is provided to be rotatable about a rotating shaft in a state of being inclined with respect to a shaft center of the rotating shaft to radiate the range-finding light guided from the projection optical system within a plane crossing the rotating shaft in a rotary manner
Implementation Method 3
a light-receiving optical system that receives the reflection range-finding light having been reflected from the measurement target and guided by the scanning mirror
Implementation Method 4
a reference light optical system that is provided in a range outside a measuring range, in which the measurement target is irradiated with the range-finding light within a radiation range in which the range-finding light is radiated by the scanning mirror in a rotary manner, to receive and reflect the range-finding light, reflected from the scanning mirror, as the internal reference light
Data Source
AI summary
A 3-dimensional measuring device includes: a light source unit; a projection optical system; a scanning mirror that is provided to be rotatable about a rotating shaft in a state of being inclined with respect to a shaft center of the rotating shaft to radiate a range-finding light within a plane crossing the rotating shaft in a rotary manner; a light-receiving optical system that receives a reflection range-finding light; a reference light optical system that is provided in a range outside a measuring range within a radiation range to receive and reflect the range-finding light as an internal reference light, the reference light optical system being capable of changing a light quantity of the internal reference light; and a light receiving element that receives the reflection range-finding light and the internal reference light.