Dual Lens Imaging Device Dome Cover Alignment
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Solution Overview
Problem
Network cameras with pan/tilt rotational control face difficulties in focusing on objects when combining tilt photography with pan/tilt rotational control, and mounting multiple lens units with different focal lengths can degrade video resolution due to the dome cover's positional relation with the lens units.
Innovation Solution
An imaging device with a first and second lens unit of different focal lengths, supported by a unit that positions their optical axes closer to the vertical angle relative to the dome cover's inner surface, minimizing the impact of the dome cover on video resolution and enabling focus on a wide field angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If multiple lens units with different focal lengths are mounted on a network camera, then the depth of field is improved, but the video resolution degrades due to the dome cover's positional relation with the lens units
Solution Approach 1:
The patent applies asymmetry by positioning the optical axes of multiple lens units at different angles relative to the dome cover's inner surface. Specifically, the first optical axis is positioned at a first angle and the second optical axis at a second angle, creating an asymmetric arrangement that optimizes both depth of field and video resolution by minimizing the impact of the dome cover on each lens unit's performance
Solution Approach 2:
The patent applies local quality by optimizing the positional relation between the dome cover and each lens unit individually. Each lens unit is positioned at specific angles relative to the dome cover inner surface to minimize local optical degradation, allowing each lens to operate at its optimal performance point while contributing to the overall system's depth of field
2Duration of action of stationary object
If tilt photography is used to deepen the depth of focus, then the depth of focus is improved, but the focusing and pan/tilt rotational control become difficult to combine quickly
Solution Approach 1:
The patent applies segmentation by dividing the imaging function into multiple independent lens units, each capable of independent focusing and optical axis positioning. This allows the system to achieve deep depth of field through multiple lens units while maintaining independent control over each unit's focusing and pan/tilt rotational control, eliminating the complexity of combining these functions in a single lens system
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
The solution allows for high-quality video capture with a deep depth of field by optimizing the positioning of lens units within the dome cover, reducing vignetting and maintaining image quality across varying subject distances.
Implementation Method 1
a first lens unit (201) configured to have a first optical axis (201a) and a first focal length (201b); a second lens unit (202) configured to have a second optical axis (202a) and a second focal length (202b) shorter than the first focal length (201b)
Implementation Method 2
a dome shaped protection cover (101) disposed on a subject side of the first lens unit (201) and the second lens unit (202) and protect the first lens unit (201) and the second lens unit (202)
Data Source
AI summary
An imaging device capable of a rotation in a predetermined direction includes a first lens unit having a first optical axis and a first focal length, a first imaging unit to image light passing through the first lens unit; a second lens unit having a second optical axis and a second focal length shorter than the first focal length, a second imaging unit to image light passing through the second lens unit, a dome shaped protection cover disposed on a subject side of the first and the second lens unit and protect the first and the second lens unit, and a support unit for supporting the first and the second lens unit so that an angle at which the first optical axis intersects an inner surface of the protection cover is closer to a vertical angle than an angle at which the second optical axis intersects the inner surface of the protection cover.