Angular Velocity Sensor Positioning for Vibration Detection Accuracy
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Solution Overview
Problem
Conventional image pickup apparatuses face challenges in accurately detecting vibrations due to temperature changes and vibrations from internal components, leading to erroneous angular velocity sensor readings.
Innovation Solution
The apparatus includes an angular velocity detector positioned on a flexible substrate thermally separated from the control substrate, with a reinforcing member and buffer member to minimize external influences, and strategically located to avoid temperature and vibration sources, ensuring accurate vibration detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the angular velocity sensor is disposed near the camera microcomputer or at the grip to detect vibrations, then the vibration detection capability is improved, but the temperature changes from these components cause erroneous sensor readings
Solution Approach 1:
The angular velocity sensor is extracted from the temperature-prone areas (grip and microcomputer vicinity) and relocated to a thermally stable position on the optical axis between the imaging lens and image sensor. This extraction removes the sensor from the harmful thermal environment while preserving its vibration detection function.
Solution Approach 2:
The patent introduces a holder structure that positions the angular velocity sensor at an intermediate location on the optical axis, away from both the grip and microcomputer. This intermediary positioning allows the sensor to detect vibrations while being shielded from direct thermal influence of nearby components.
2Speed
If the angular velocity sensor is disposed close to the imaging lens unit to detect vibrations, then the vibration detection response is improved, but the sensor is subject to vibrations from internal components such as shutter motors and power source
Solution Approach 1:
The patent creates a localized stable environment for the angular velocity sensor by positioning it on the optical axis in a region less affected by mechanical vibrations from shutter motors and power source components. This local quality differentiation allows the sensor to maintain high response speed while avoiding vibration contamination from specific internal components.
3Device complexity
If the angular velocity sensor is disposed on the grip side to detect vibrations, then the structural compactness is improved, but the sensor is exposed to temperature changes from the grip
Solution Approach 1:
Instead of placing the sensor laterally on the grip side (two-dimensional arrangement), the patent positions it along the optical axis (one-dimensional arrangement), utilizing the depth dimension of the camera body. This dimensional change allows compact integration while avoiding thermal exposure from the grip area.
Data Source
AI summary
An image pickup apparatus includes an image sensor, a grip that projects toward an object side in an optical axis direction in the imaging optical system, a rear exterior member located opposite to the object side, a driver configured to drive in the image pickup apparatus, a first holder configured to hold the driver, a first substrate including a control element configured to control the image pickup apparatus, an angular velocity detector configured to detect an angular velocity of the vibration, and a second holder configured to hold the angular velocity detector, on a side opposite to the grip with respect to an optical axis in the imaging optical system viewed from the optical axis direction and on the object side with respect to a space formed between the first substrate and the rear exterior member in the optical axis direction.