Distance Detection Device Shake Correction Axis Alignment

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Solution Overview

Problem

Distance detection devices with image blur correction functions face issues where the direction of the reference axis does not accurately reflect the direction of irradiated light, leading to incorrect measurement directions when the device is shaken.

Innovation Solution

Incorporating a first sensor to detect the attitude of the device, a shaking correction optical system driven by a shaking detection sensor, and a second sensor to detect the position of the shaking correction optical system, with a processing unit determining the irradiating angle based on the detection results to correct for device shake.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If a shaking correction optical system is activated to correct image blur, then image stability is improved, but the reference axis direction no longer accurately reflects the light irradiation direction

Engineering Contradiction:

Improveimage stabilityVSAvoidirradiation direction accuracy

Core Design Contradiction:

Stability of the object's compositionVSMeasurement precision

Solution Approach 1:

The patent implements feedback by using a position detection sensor to continuously monitor the position of the shaking correction optical system, and using this information to calculate and apply the appropriate correction angle to the reference axis, ensuring the irradiation direction remains accurate despite system movement

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent introduces an intermediary calculation process that determines the correction angle based on the position of the shaking correction optical system, serving as a mediator between the physical system position and the reference axis direction to maintain measurement accuracy

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If the reference axis direction is used for distance measurement, then measurement process is simple, but measurement accuracy deteriorates when device shaking occurs

Engineering Contradiction:

Improvemeasurement process simplicityVSAvoiddistance measurement accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent applies preliminary action by pre-calculating the correction angle based on the position of the shaking correction optical system before performing the distance measurement, so that the reference axis is already corrected and ready for accurate measurement without adding complexity to the measurement process

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20210148703A1Distance detection device, optical instrument, and attitude detection method for distance detection device

Publication Date: 2021.05.20 NIKON VISION

AI summary

A range finder 10 according to the present embodiment includes a first sensor 440 configured to detect an attitude of a body of the range finder, a correction lens 410 configured to be driven based on a shaking amount detected by a shaking detection sensor 442, a second sensor 450 configured to detect a position of the correction lens, and a processing unit 300 configured to determine an irradiating angle of light. The processing unit can determine, based on a detection result of the attitude of the body by the first sensor and a detection result of the position of the correction lens by the second sensor, the irradiating direction (i.e. measurement direction) in which the light deflected by the correction lens which position is corrected according to the shaking amount of the attitude of the body determined from the detection result of the second sensor is actually irradiated.