Distance Measurement Device Light Emission Timing Control
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Solution Overview
Problem
Existing distance measurement devices experience disruptions in captured images due to inappropriate timing of imaging and distance measurement, leading to image quality issues.
Innovation Solution
A distance measurement device that includes an imaging unit, an emission unit emitting directional light along the optical axis, a light receiving unit, and a control unit that sets the emission timing to a predetermined period to minimize the influence of light emission on the image signal, allowing for accurate distance derivation without disrupting the image capture process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If distance measurement is performed by emitting directional light along the optical axis, then distance measurement precision is improved, but the captured image is disrupted due to light emission timing coinciding with image signal reading
Solution Approach 1:
The control unit determines the image signal reading timing in advance and sets the light emission timing to occur during periods when reading is not performed, preventing image disruption before it can occur
Solution Approach 2:
The system utilizes the periodic nature of image signal reading operations, scheduling light emission during idle periods between reading cycles, thereby achieving both accurate distance measurement and image quality preservation
2Productivity
If light emission timing is set during active reading periods, then distance measurement can be performed continuously, but image quality deteriorates due to light interference
Solution Approach 1:
The control unit monitors the image signal reading timing and uses this feedback information to dynamically adjust and determine appropriate light emission timing, ensuring continuous operation without image degradation
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
The solution effectively suppresses image disruption by synchronizing light emission with image signal reading periods, ensuring precise distance measurement while maintaining image quality.
Implementation Method 1
an imaging unit which captures a subject image formed by an imaging optical system and generates an image signal
Implementation Method 2
an emission unit which emits directional light as light having directivity to emit the directional light along an optical axis direction
Implementation Method 3
a derivation unit which derives a distance to the subject based on a timing at which the directional light is emitted and a timing at which the reflected light is received
Data Source
AI summary
A distance measurement device includes an imaging unit, an emission unit which emits directional light as light having directivity to emit the directional light along an optical axis direction of an imaging optical system, a light receiving unit which receives reflected light of the directional light from a subject, a derivation unit which derives a distance to the subject based on a timing at which the directional light is emitted by the emission unit and a timing at which the reflected light is received by the light receiving unit, and a control unit which performs control such that the emission unit sets a timing, at which the directional light is emitted, to a predetermined period during which the influence of the emission of the directional light on an image signal is suppressed.