Image Pickup Device Tilt Mechanism with Rotating Optical Filter
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Solution Overview
Problem
Existing image pickup devices with both tilt mechanisms for the image pickup element and optical filter insertion/extraction mechanisms face limitations in securing sufficient tilt amounts during rotational movement, as the optical filter mechanism can prevent adequate rotational adjustment.
Innovation Solution
The image pickup device incorporates a base member with rotary shafts that supports both the optical filter unit and image pickup element unit, allowing them to rotate together while using stepping motors and photo-interrupters to adjust the position of the optical filter, ensuring the tilt amount is secured and preventing light beam obstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If both tilt mechanism and optical filter insertion/extraction mechanism are included, then image pickup element can be tilted to increase depth of field, but optical filter mechanism prevents sufficient rotational movement
Solution Approach 1:
The optical filter unit is segmented from the main camera body, mounted on a rotating base member that is separate from the tilt adjustment mechanism. This segmentation allows the optical filter to rotate independently with the image pickup element without interfering with the tilt mechanism's rotational movement.
Solution Approach 2:
The optical filter insertion and extraction mechanism operates in a direction orthogonal to the optical axis, while the tilt mechanism operates in a rotational dimension. By positioning these mechanisms in different dimensional spaces, they can coexist without interfering with each other's movement ranges.
2Object-affected harmful factors
If optical filter is disposed near image pickup element, then it can effectively cut infrared light, but it obstructs light beam during rotational movement
Solution Approach 1:
The optical filter unit is made dynamically adjustable through rotational movement on the base member. By rotating the optical filter unit to different positions, the system can dynamically switch between having the optical filter in the light path (for infrared cutting) and having it rotated away (to prevent light beam obstruction during tilt adjustment).
Solution Approach 2:
Before performing tilt adjustment, the system preliminarily rotates the optical filter unit to a position where it will not obstruct the light beam path during the upcoming rotational movement. This preliminary positioning prevents light beam obstruction while maintaining the capability to cut infrared light when needed.
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 ensures sufficient tilt of the image pickup element and prevents light beam obstruction, enabling effective image capture in both day and night modes by allowing precise rotational movement of the optical filter and image pickup element.
Implementation Method 1
an optical filter that cuts light in an infrared region
Implementation Method 2
photo-interrupters to adjust the position of the optical filter
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3
AI summary
An image pickup device of the present invention includes an image pickup element, an image pickup element holder that supports the image pickup element and is rotationally movable with respect to a plane orthogonal to an optical axis of an image pickup lens, an optical filter, and an optical filter holder that extractably supports the optical filter onto the optical axis of the image pickup lens. The optical filter holder rotationally moves along with a rotational movement of the image pickup element holder in an identical direction.