EVF Optical Path Split Prism for Line-of-Sight Detection
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Solution Overview
Problem
Existing imaging apparatuses with electronic viewfinders (EVFs) and line-of-sight detection functions lack a suitable optical arrangement that prevents dust ingress and maintains operability, particularly in the relative arrangement of operation members and built-in components.
Innovation Solution
The imaging apparatus incorporates an optical path split prism unit and a line-of-sight detection mechanism, including an optical path split prism, infrared LEDs, and a proximity detection unit, which are integrated into the EVF structure to minimize visibility and maintain operability while enabling line-of-sight detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an optical path split mirror is used to enable line-of-sight detection through the EVF, then line-of-sight detection function is achieved, but dust in the finder may affect visibility and operability
Solution Approach 1:
The optical path is divided into separate channels: a first optical path for the display image and a second optical path for line-of-sight detection. The optical path split prism separates these paths, allowing the line-of-sight detection sensor to receive light through a dedicated path while the display remains unaffected by dust in either path.
Solution Approach 2:
The optical path split prism acts as an intermediary element that redirects light from the display panel to the line-of-sight detection sensor through a separate optical path. This mediator enables the detection function without compromising the main display path, isolating the two functions from each other's harmful effects.
2Adaptability or versatility
If the line-of-sight detection sensor is positioned on the common optical path, then line-of-sight detection is enabled, but it may interfere with the display image visibility
Solution Approach 1:
The optical path is segmented into distinct first and second paths. The first path carries the display image to the user's eye, while the second path carries light from the display panel to the line-of-sight detection sensor. This segmentation ensures that the sensor does not intercept display image light, maintaining full visibility.
Solution Approach 2:
The optical path split prism redirects light from the first optical path into the second optical path at a different spatial dimension or angle. This dimensional change allows the line-of-sight detection to occur without blocking or interfering with the primary display image path.
3Volume of moving object
If operation members and built-in members are arranged in a compact configuration, then device size is reduced, but operability may decrease due to spatial constraints
Solution Approach 1:
The eyepiece portion is positioned in a direction substantially perpendicular to the optical axis of the EVF, utilizing spatial arrangement in another dimension. This perpendicular arrangement allows operation members to be positioned without interfering with the optical path, maintaining operability while achieving compact integration.
Solution Approach 2:
The optical path split prism has an asymmetric configuration where the first and second optical paths are arranged at different angles and positions. This asymmetric layout optimizes the spatial relationship between the display path and detection path, allowing compact arrangement while maintaining clear separation of functions and preserving operability.
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
This configuration effectively prevents a decrease in operability by reducing crosstalk and maintaining functionality, ensuring clear visibility and accurate line-of-sight detection without compromising the overall performance of the imaging apparatus.
Implementation Method 1
an optical path split unit configured to reflect light from the display panel away and to guide external light to the sensor
Implementation Method 2
The EVF structure includes infrared LEDs and a proximity detection unit
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
An imaging apparatus including a first sensor configured to image an optical subject image incident via a first lens unit includes a display panel, an eyepiece portion, a second sensor configured to image an eye of a user viewing the display panel by looking into the eyepiece portion, the second sensor being different from the first sensor, an optical path split unit configured to guide light from the display panel to outside the imaging apparatus and to guide external light to the second sensor, and a second lens unit disposed between the optical path split unit and the eyepiece portion, wherein the second sensor is disposed at a different side from a side where a grip region of the imaging apparatus is disposed with respect to an optical axis of the second lens unit.