Lens Device Dual Rings Diaphragm Filter Exposure Control
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Solution Overview
Problem
Existing lens devices for image capturing apparatuses face challenges in providing intuitive and efficient control over light transmission, as both diaphragm devices and light transmittance variable filters have different mechanisms, making it difficult to achieve correct exposure and depth of field adjustments while increasing costs and reducing usability.
Innovation Solution
A lens device with a cylindrical housing incorporating both a diaphragm device and a light transmittance variable filter, featuring a first operation ring for adjusting the diaphragm aperture and a second operation ring for adjusting the light transmittance variable filter, where both rings provide the same operation feeling and feedback control to ensure accurate exposure control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a diaphragm device is used to adjust light amount, then the aperture area can be minimized for bright outdoor images, but resolving power is lowered by light diffraction at small aperture positions
Solution Approach 1:
The patent segments the light transmission control function into two independent components: a diaphragm device for aperture control and a light transmittance variable filter for density control. This allows each component to operate in its optimal range, with the filter handling extreme light reduction needs without forcing the diaphragm to use diffraction-prone small apertures.
Solution Approach 2:
The light transmittance variable filter acts as an intermediary element that reduces light transmission through absorption rather than geometric constriction. This mediator allows the diaphragm to maintain larger, diffraction-free apertures while still achieving correct exposure through the combined effect of aperture and filter density.
2Illumination intensity
If a light transmittance variable filter is used instead of a diaphragm device, then correct exposure can be obtained for bright outdoor images and resolving power is maintained, but the ability to adjust depth of field by expanding or contracting aperture area is lost
Solution Approach 1:
The patent merges the diaphragm device and light transmittance variable filter into a combined system where both components work together. The diaphragm maintains its depth of field control function while the filter provides additional light transmission control, creating a system that preserves all advantages of both individual components.
3Adaptability or versatility
If both a diaphragm device and a light transmittance variable filter are equipped in combination, then correct exposure can be obtained in any photographing conditions and both resolving power and depth of field adjustment are maintained, but manufacturing cost increases
Solution Approach 1:
The patent implements a control system where a single operation ring provides multi-functional control over both the diaphragm device and light transmittance variable filter. This universal control mechanism allows one component to perform multiple functions, reducing the need for separate controls and potentially lowering overall system complexity and cost despite the presence of two light transmission control elements.
4Adaptability or versatility
If two light amount adjusting means are equipped in combination, then exposure control is improved, but the number of operation tools increases making operation less intuitive and increasing complexity
Solution Approach 1:
The patent merges the control of two separate light transmission devices (diaphragm and filter) into a single operation ring system. This allows the user to control both elements through one intuitive rotational input, maintaining operational simplicity while achieving the benefits of dual light control mechanisms.
Solution Approach 2:
The operation ring serves multiple functions: it controls both the diaphragm device and the light transmittance variable filter, and can provide different operation feelings (click sensations) to indicate which device is currently being adjusted. This multi-functional control interface eliminates the need for separate controls while maintaining operational intuitiveness.
Data Source
AI summary
A lens device (2) is provided with a first operating ring (11) for adjusting the opening surface area of an aperture device (15) and a second operating ring (12) for adjusting the transmittance of a variable light transmittance filter (16). The correspondence relation between the operational amount for the first operating ring and the rate of change in the amount of light transmitted by the aperture device and correspondence relation between the operational amount for the second operating ring and the rate of change in the amount of light transmitted by the variable light transmittance filter are the same.