Image Pickup Apparatus Bounce Emission Pre-Emission Control
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Solution Overview
Problem
In bounce emission photographing, the pre-emission operation can saturate the AF sensor, leading to focus errors and incorrect bounce angle settings due to overlapping timing with AF auxiliary light emission.
Innovation Solution
An image pickup apparatus with a lighting device that adjusts its irradiation angle, including a pre-emission unit and an AF auxiliary light unit, where the pre-emission is prohibited during focus control to prevent sensor saturation and ensure accurate distance measurement and bounce angle setting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pre-emission is performed during charge-storage operation of AF sensor, then distance measuring for bounce angle setting is enabled, but AF sensor saturation occurs causing focus errors
Solution Approach 1:
The prohibition unit preemptively prevents pre-emission from occurring during AF sensor charge-storage operation by detecting the timing overlap and blocking the pre-emission command, thereby avoiding sensor saturation before it happens
Solution Approach 2:
The prohibition unit acts as an intermediary control mechanism between the pre-emission unit and AF sensor, monitoring their operational timing and intervening to prevent harmful overlap without affecting their individual functions
2Measurement precision
If AF auxiliary light unit emits light during pre-emission, then distance measuring operation is enabled, but error occurs in distance measuring data
Solution Approach 1:
The prohibition unit preemptively prevents the harmful combination of AF auxiliary light emission during pre-emission by detecting when both operations would occur simultaneously and blocking the pre-emission timing, thereby preserving data accuracy
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 correct focusing and accurate bounce angle setting by preventing pre-emission during focus control, thereby resolving focus and angle errors caused by sensor saturation.
Implementation Method 1
a lighting device emit light toward a ceiling etc. to illuminate an object with diffuse reflection from the ceiling
Implementation Method 2
a first distance measuring unit configured to measure a first distance between the image pickup apparatus and an object using the pre-emission of the lighting device
Data Source
AI summary
An image pickup apparatus capable of focusing correctly and of setting a bounce angle accurately. A lighting device that changes an irradiation angle is attached to an apparatus body. A first control unit drives the lighting device to perform pre-emission when the irradiation angle is controlled for bounce emission photographing where an object is photographed while being illuminated by a reflected light emitted from the lighting device and reflected by reflection material. A first distance measuring unit measures a first distance to the object and a second distance to the reflection material using the pre-emission. A second control unit sets up the irradiation angle based on the first and second distances and controls the lighting device to the set irradiation angle. A second distance measuring unit measures a third distance to the object during focus control. A prohibition unit prohibits the pre-emission when the second distance measuring unit measures the third distance.