Lens Device with Operating Member Feedback for Focus Position Control
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Solution Overview
Problem
Existing lens systems lack intuitive means to ascertain the position of movable lenses during auto focus control, hindering effective imaging operations.
Innovation Solution
A lens device and system that includes a movable lens, a target position information acquiring unit, a transmitting unit, and a driving unit, which allows for intuitive position ascertainment through an operating member with a detection unit and driving mechanism, enabling precise control and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the operation device is used for manual focus control, then the lens system can be simplified by dispensing with a dedicated member for switching instruction, but it becomes impossible to intuitively ascertain the position of the focus lens during auto focus control
Solution Approach 1:
The patent implements a feedback mechanism where the operation device displays focus lens position information during auto focus control. The control unit acquires position information from the lens device and transmits it to the operation device, which then displays it to the user. This feedback loop resolves the contradiction by providing intuitive position ascertainment while maintaining the simplified lens system structure.
Solution Approach 2:
The operation device serves as an intermediary between the lens device and the user. It receives position information from the lens device and presents it in a visually intuitive format (such as scale markings or indicators). This intermediary role allows the operation device to fulfill both its manual control function and its information display function, resolving the contradiction between system simplicity and information availability.
2Ease of operation
If the operation device displays focus lens position information, then the operator can intuitively ascertain the position, but the device complexity increases
Solution Approach 1:
The operation device is designed to perform multiple functions: manual focus control, auto focus control, and position information display. By making the operation device universal and multi-functional, the patent avoids adding separate dedicated components for each function. This resolves the contradiction by improving ease of operation through position display while preventing excessive increase in device complexity through functional integration.
3Reliability
If a dedicated member for switching instruction is added, then the switching between AF and MF control becomes more reliable, but the lens system complexity increases
Solution Approach 1:
The operation device is designed to universally handle both auto focus and manual focus control modes, as well as display position information. By making the operation device multi-functional, the patent eliminates the need for dedicated switching members while maintaining reliable control mode switching. This resolves the contradiction by achieving reliable switching through functional integration rather than adding dedicated components.
Data Source
AI summary
A lens device includes: a movable lens capable of being moved in a direction of an optical axis and configured to be moved by an operating member driven by an operating member driving unit; an optical member that reflects a portion of light having passed through the movable lens; a target position information acquiring unit that acquires information of a target position of the movable lens by calculating the target position based on the reflected light; and a movable lens driving unit that performs first driving for moving the movable lens based on a position of the operating member detected by an operating member position detection unit, and the operating member driving unit drives the operating member based on the information of the target position.