Ophthalmic Apparatus Operation Unit Fine Rough Movement Control
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Solution Overview
Problem
Existing ophthalmic apparatuses complicate the input of both fine and rough movement instructions for adjusting the relative position of an optometry unit with respect to a subject eye, often requiring different operation mechanisms and significant tilting of the operation stick.
Innovation Solution
An ophthalmic apparatus with an operation unit that includes a tiltable operation stick, a rough movement operation unit, and an operation detection unit, where the controller controls the drive unit to finely or roughly move the optometry unit based on the detected tilt operations, allowing both fine and rough movements to be input easily and appropriately without switching operation parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different operation mechanisms are used for fine movement and rough movement instructions, then the input of both fine and rough movement instructions can be differentiated, but the operation complexity increases
Solution Approach 1:
The operation stick serves multiple functions: it can detect both fine movement instructions (within predetermined tilting range) and rough movement instructions (exceeding predetermined tilting range) using the same operational interface, eliminating the need for separate operation mechanisms while maintaining clear differentiation between instruction types
2Adaptability or versatility
If the operation stick is greatly tilted to input rough movement instruction, then the rough movement can be distinguished from fine movement, but the ease of operation decreases
Solution Approach 1:
The system distinguishes between fine and rough movement instructions by monitoring the magnitude parameter of the operation stick's tilting angle. When the tilting angle exceeds a predetermined threshold, the system interprets it as a rough movement instruction; otherwise, it is treated as a fine movement instruction. This parameter-based differentiation maintains ease of operation while clearly distinguishing between movement types
3Device complexity
If a single operation stick is used for both fine and rough movements, then the operation interface is simplified, but the precision of movement control may be compromised
Solution Approach 1:
The control system dynamically adjusts the movement control precision based on the detected tilting range of the operation stick. For small tilting angles within the predetermined range, the system applies fine movement control with higher precision. For larger tilting angles exceeding the threshold, the system applies rough movement control with appropriate precision levels. This dynamic adaptation maintains movement control precision while using a unified operation interface
Data Source
AI summary
A controller of an ophthalmic apparatus finely drives and roughly drives a drive unit of an optometry unit. In a case where a tilt operation of tilting the operation stick within a predetermined range is detected by an operation detection unit, the controller finely drives the drive unit by controlling the drive unit in response to the detected tilt operation, and finely changes a position of the optometry unit. In a case where at least one of a tilt operation of tilting the operation stick over a predetermined range and an operation of a rough movement operation unit is detected by the operation detection unit, the controller roughly drives the drive unit by controlling the drive unit in response to the detected operation, and roughly changes the position of the optometry unit.