Diaphragm Control Apparatus for Interchangeable Lens Camera
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Solution Overview
Problem
Existing diaphragm control apparatuses in interchangeable lens cameras maintain the fully-open state when the power is off, allowing sunlight to enter and potentially damage camera components, and have a complex structure due to internal biasing springs and additional parts.
Innovation Solution
A diaphragm control apparatus that includes a drive motor, a lead screw, and a diaphragm control slider in the camera body, which changes the diaphragm aperture to the minimum position when the power is turned off and initializes the maximum aperture position when turned on, using a stepping motor and position detection system to simplify the structure and prevent sunlight entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the diaphragm device maintains the fully-open state when power is OFF, then the camera structure is simple, but sunlight can enter and damage internal components
Solution Approach 1:
The controller activates the drive motor before turning off power to close the diaphragm to the minimum aperture state. This preliminary action ensures the diaphragm is in a protected state before power is cut, preventing sunlight damage to internal components while maintaining a simple overall structure without requiring additional mechanical retention mechanisms.
2Reliability
If a biasing spring is added to the camera body to bias the diaphragm control projection, then the diaphragm can be maintained in a closed state, but the number of parts and structural complexity increases
Solution Approach 1:
The patent replaces the mechanical biasing spring system with an electrically-controlled drive motor and controller. The controller activates the drive motor to position the diaphragm control slider and maintain the diaphragm in the minimum aperture state when power is OFF, eliminating the need for complex mechanical springs and support structures while achieving reliable position control.
3Reliability
If the drive motor is activated to change the aperture to minimum position before power OFF, then sunlight damage is prevented, but energy is consumed during the transition
Solution Approach 1:
The controller activates the drive motor in advance to close the diaphragm to the minimum aperture state before the power switch turns OFF. This preliminary action ensures complete protection against sunlight damage while minimizing energy consumption by only operating the motor during the brief transition period rather than continuously.
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 effectively prevents sunlight from entering the camera body, protecting internal components and simplifies the camera body structure by reducing the number of parts, ensuring the diaphragm is always in a safe state when the camera is off.
Implementation Method 1
a lead screw which is driven to rotate by the drive motor, and a diaphragm control slider which moves by rotation of the lead screw
Implementation Method 2
using a stepping motor and position detection system to simplify the structure and prevent sunlight entry
Data Source
AI summary
A diaphragm control apparatus is provided with a controller. When a photographing lens is attached to a camera body and a power switch is turned from ON to OFF, a drive motor first moves a diaphragm device to a minimum aperture, and thereafter the drive motor is switched from power ON to OFF. Thus, any damage to the inside of camera body due to sunlight entering into the opening of the diaphragm device can be prevented, and also the structure of camera body can be simplified by reducing the number of parts.