Strobe Light Emission Device Bounce Flash Rotation Control
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Solution Overview
Problem
Existing light emission devices in image pickup apparatuses, such as digital cameras, face challenges in performing bounce flash shooting due to potential interference with obstacles and illumination of the photographer's eyes, especially when rotating the light emission section to achieve the correct angle.
Innovation Solution
A system with a light emission device that includes a movable unit with a light emission section, capable of rotation about two axes, and a control unit that determines the optimal irradiating direction and prevents interference by adjusting the rotational angles, ensuring the light emission section does not turn towards the photographer's eyes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the light emission section is rotated through 180° in the lateral direction to reach the correct bounce angle, then the proper irradiating direction is achieved, but the light emission section may interfere with obstacles or turn toward the photographer's eyes
Solution Approach 1:
The control unit performs preliminary determination of the rotational angle in the lateral direction before executing the rotation. By calculating whether the light emission section will interfere with obstacles or turn toward the photographer's eyes during the 180° rotation, the system can prevent harmful effects before they occur, rather than reacting after the problem arises.
Solution Approach 2:
The control unit continuously monitors the rotational angle and determines in advance whether the light emission section will encounter obstacles or face the photographer during rotation. This feedback mechanism allows the system to adjust or cancel the rotation command to avoid harmful effects while still achieving the desired bounce angle when safe.
2Illumination intensity
If the light emission section is rotated in the vertical direction to achieve the proper bounce angle, then natural illumination is improved, but the mechanism restrictions may prevent reaching the correct angle
Solution Approach 1:
When the vertical rotation mechanism reaches its limit and cannot achieve the correct bounce angle, the control unit switches to rotating the light emission section in the lateral direction. By utilizing a different dimensional degree of freedom (lateral rotation instead of vertical rotation), the system can achieve the desired irradiating direction even when one axis is constrained by mechanical restrictions.
3Productivity
If the movable unit is rotated to the optimum irradiating direction for bounce flash shooting, then the bounce flash effect is achieved, but the movable unit may unexpectedly interfere with obstacles
Solution Approach 1:
Before rotating the movable unit to the optimum irradiating direction, the control unit determines the rotational angle in the lateral direction and checks whether this rotation will cause interference with obstacles. By performing this safety check in advance, the system can prevent obstacle interference while still achieving the bounce flash shooting capability when the path is clear.
Data Source
AI summary
A technique that prevents a movable unit of a strobe device including a light emission section from unexpectedly interfering with an obstacle during rotation thereof. The movable unit is supported in a manner rotatable with respect to a device body about a first axis in a vertical direction, and rotatable about a second axis in a lateral direction. In bounce flash shooting, the movable unit irradiates light from the light emission section toward a ceiling to cause reflected light from the ceiling to be irradiated to an object. The movable unit is rotated such that the light emission section is oriented in the optimum irradiating direction. Whether to drive the movable unit in the lateral direction is determined based on a result of determining whether a rotational angle of the movable unit driven in the vertical direction exceeds a predetermined angle.