Flash Unit Color Temperature Control via Discharge Cut-Off
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing flash units lack flexibility in controlling color temperature and energy distribution across multiple channels, leading to limitations in asymmetry and requiring user-specific knowledge, which complicates operation and results in non-repeatability and color inconsistencies in photography.
Innovation Solution
A flash generator with an energy quantity control device and color temperature control device allows for independent setting of energy and color temperature for each light source channel, enabling flexible and consistent illumination with any number of flash tubes, and a trigger device and cut-off mechanism ensure optimal image results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the entire time interval of the flash discharge is used for exposure, then the total light output is maximized, but the average color temperature becomes dependent on the flash energy selected
Solution Approach 1:
The patent applies partial action by using only a portion of the total flash discharge time for the actual exposure. A cut-off mechanism terminates the flash discharge prematurely, excluding the later low-temperature phase from the exposure interval. This allows the system to achieve consistent color temperature across different energy levels while still capturing sufficient light for proper exposure.
2Stability of the object's composition
If flash cut-off technique is used to maintain constant color temperature, then color temperature stability is improved, but the available flash energy is reduced
Solution Approach 1:
The flash cut-off technique deliberately uses only a partial portion of the available flash energy - specifically the high-temperature initial phase - while discarding the lower-temperature later phase. This partial action resolves the contradiction by prioritizing color temperature stability over complete energy utilization, achieving consistent color rendering at the cost of leaving some energy unused.
3Stability of the object's composition
If simultaneous control of flash time and flash voltage is implemented, then color temperature regulation is improved, but device complexity increases
Solution Approach 1:
The patent extracts and isolates the color temperature control function by implementing a dedicated cut-off mechanism that operates independently of the main flash triggering system. This separate control element specifically manages the discharge termination timing, allowing color temperature regulation without requiring complex simultaneous control of both flash time and voltage, thereby reducing overall system complexity.
4Stability of the object's composition
If the flash discharge is stopped prematurely to compensate for low initial output, then color temperature can be kept constant, but the total light output is reduced
Solution Approach 1:
The patent changes the temporal parameter of the flash discharge by introducing a cut-off point that terminates the discharge before the natural decay phase. This parameter change - controlling the duration and timing of the discharge - allows the system to maintain constant color temperature by excluding the reddish low-temperature phase, while the cut-off technique itself is optimized to preserve sufficient total light output for proper exposure.
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 provides high flexibility and optimal settings for photographers, allowing for consistent color temperature and energy distribution across all channels, eliminating the need for user-specific knowledge and enabling convenient handling and unlimited asymmetry adjustments.
Implementation Method 1
In physical terms, the color temperature is defined by means of the integral of the intensity distribution (Planck distribution) of the black body radiation
Implementation Method 2
The relatively high energy required for that purpose can be set by charging the capacitors of the energy store to a correspondingly high degree
Data Source
AI summary
A flash unit that includes a flash generator having at least one energy storage element and at least two light source channels as well as having at least two flash tubes, the flash tubes being supplied with energy by the energy storage element by means of the light source channels. The flash unit further includes an energy quantity control device, by means of which it is possible to provide for each light source channel any desired energy quantity from a minimum charge to a maximum charge of the at least one energy storage element, and a color temperature control device, by means of which it is possible to set a color temperature for each light source channel independently of the energy quantity provided therefor. The functions of all light source channels are fully equivalent.