Viewfinder Index Display for Camera Focus Adjustment
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Solution Overview
Problem
In camera apparatuses using focus demands for focus adjustment, cameramen need to move away from the viewfinder to check the focal position, and existing methods with multi-rotation rotary encoders do not accurately indicate the rotational operation position, making focus adjustment inconvenient and imprecise.
Innovation Solution
A camera apparatus that generates an index display signal for showing the current focal position, allowing it to be displayed alongside the captured image in the viewfinder, along with optional position markers and names, enabling precise focus adjustment without leaving the line of sight, using a display signal generation unit and combination unit to combine these signals with the captured image signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a cameraman uses a focus demand with marking tape to check the rotational operation position, then the focal position can be identified, but the cameraman must move away from the viewfinder line of sight
Solution Approach 1:
The patent creates a visual copy of the focal position information by displaying an index on the viewfinder screen that corresponds to the rotational position of the focus demand. This allows the cameraman to see the focal position information directly on the viewfinder without needing to look at physical markings on the focus demand itself, thereby maintaining continuous viewfinder operation while still identifying the focal position accurately.
2Adaptability or versatility
If a multi-rotation rotary encoder is used in the focus demand, then the focus adjustment range is extended, but the marking tape does not accurately indicate the rotational operation position
Solution Approach 1:
The patent implements a feedback system where the display signal generation unit receives focal position information from the lens apparatus (which is driven by the multi-rotation rotary encoder) and generates an index display signal that is shown on the viewfinder. This provides real-time feedback about the actual focal position corresponding to the focus demand rotation, allowing the cameraman to accurately determine the rotational operation position despite the multi-rotation capability of the encoder.
3Ease of operation
If the cameraman leaves a marking tape on the focus demand, then the operational position can be marked, but the process becomes complex and requires additional materials
Solution Approach 1:
The patent makes the system self-service by automatically generating and displaying the focal position index on the viewfinder based on the focal position information received from the lens apparatus. This eliminates the need for external marking materials like tape and removes the manual process of marking positions, thereby simplifying the overall system while maintaining ease of operation.
Data Source
AI summary
There is provided a camera apparatus including: a display signal generation unit that generates an index display signal for displaying an index indicative of a current focal position based on focal position information; and a combination unit that acquires an image signal for a viewfinder by combining a captured image signal with the index display signal.