Focal Plane Shutter Actuator Heat Equalization
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Solution Overview
Problem
Existing focal plane shutters experience a significant difference in heat generation and temperature between the leading and trailing shutter actuators due to varying energization periods, current values, and resistance values, leading to differences in rotational speed and potentially affecting image quality, especially during continuous shooting.
Innovation Solution
The implementation of a focal plane shutter system with a drive control portion that additionally energizes one of the shutter actuators to restrict its movement, thereby reducing the heat generation difference between the leading and trailing shutter actuators during a shooting operation, using a restrict portion to manage the reciprocating movement ranges and employing buffering members to absorb impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the leading shutter actuator and trailing shutter actuator operate with different energization periods and current values, then the shutters can be driven to open and close the opening, but a difference in heat generation amount between the actuators increases, leading to temperature differences and rotational speed differences
Solution Approach 1:
The drive control portion performs preliminary action by additionally energizing one actuator before the other to equalize their energization periods. This preliminary energization ensures that both actuators experience similar heat generation amounts, preventing temperature differences and maintaining consistent rotational speeds during continuous shooting operations
Solution Approach 2:
The system changes the energization parameters (current, voltage, or time) of one actuator to match the other. By adjusting these parameters dynamically, the drive control portion ensures both actuators generate equivalent heat, eliminating temperature differentials and their adverse effects on rotational speed consistency
2Temperature
If additional energization is applied to one actuator to equalize heat generation, then temperature difference is reduced, but energy consumption increases
Solution Approach 1:
The system applies partial additional energization only to the actuator that would otherwise generate less heat. This partial action is sufficient to equalize heat generation between actuators without applying excessive energy to both, thereby minimizing overall energy consumption while achieving temperature uniformity
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
This solution effectively suppresses the difference in heat generation and temperature between the actuators, maintaining consistent moving speeds of the shutters and enhancing image quality by minimizing the impact of heat generation disparities during both single and continuous shooting operations.
Implementation Method 1
The energization of the actuator increases the heat generation amount of a coil of the actuator to increase its temperature. This results in an increase in a resistance value of the coil
Data Source
AI summary
An imaging device includes: a focal plane shutter including: a board including an opening; a leading shutter and a trailing shutter opening and closing the opening; a leading shutter actuator and a trailing shutter actuator respectively driving the leading shutter and the trailing shutter; and a restrict portion that restricts reciprocating movement ranges of the leading shutter and the trailing shutter, an image pickup element which light enters through the opening; and a drive control portion.