Position Detection for Camera Module Lens Alignment
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Solution Overview
Problem
Miniaturization of camera devices leads to reduced light detection quality due to smaller aperture areas, and misalignment of short focal distance lenses with image pickup devices hinders accurate testing and manufacturing, necessitating precise position detection and adjustment.
Innovation Solution
A position detection apparatus using a light source, illumination lens, and position detecting section to adjust the relative position of image pickup devices and lenses based on output signals from photo-detecting elements, ensuring equal light intensity and alignment with the optical axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the photo-detecting element is miniaturized to increase pixel multiplication, then the definition and pixel count are improved, but the aperture area becomes small and the quality of light detected decreases
Solution Approach 1:
A condensing micro lens is introduced as an intermediary component between the illumination lens and the photo-detecting element. This micro lens condenses and concentrates the incident light onto the small aperture of the miniaturized photo-detecting element, thereby improving the quality and intensity of light detected without requiring增大 the photo-detecting element size
Solution Approach 2:
The optical parameters of the illumination system are changed by adjusting the focal distance of the illumination lens to a short focal distance, and by positioning the condensing micro lens at a specific distance from the photo-detecting element. These parameter changes enable effective light condensation onto miniaturized photo-detecting elements
2Volume of moving object
If the distance between the image pickup device and the lens is shortened for camera miniaturization, then the camera size is reduced, but the lens position misalignment becomes more critical and testing accuracy decreases
Solution Approach 1:
Before performing the actual image pickup device testing, the system first performs position detection using a separate position detection section. The illumination lens projects a light pattern, and the position detection section detects the relative position between the lens and image pickup device in advance, allowing for preliminary alignment adjustment before quality testing
Solution Approach 2:
The system implements a feedback mechanism where the position detection section continuously monitors the relative position between the lens and image pickup device, and this position information is fed back to adjust the lens or device position to maintain accurate alignment during testing
3Volume of moving object
If a short focal distance lens is used for camera miniaturization, then the camera size is reduced, but the light distribution becomes uneven when position misalignment occurs
Solution Approach 1:
The condensing micro lens acts as an intermediary that corrects light distribution uniformity. By condensing light from the short focal distance lens onto each photo-detecting element, it compensates for position misalignment effects and ensures uniform light intensity across all photo-detecting elements
Solution Approach 2:
The system applies local quality adjustment through individual condensing micro lenses positioned over each photo-detecting element. Each micro lens independently controls and equalizes the light intensity for its corresponding photo-detecting element, ensuring uniform light distribution across the entire array even when the lens is misaligned
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 solution enables accurate detection and adjustment of image pickup devices and lenses, ensuring even light distribution and precise alignment, thereby enhancing the testing and manufacturing processes of camera modules.
Implementation Method 1
a light source for generating light, an illumination lens for illuminating the light generated by the light source onto the image pickup device
Implementation Method 2
an image pickup device that outputs an output signal corresponding to intensity of detected light
Data Source
AI summary
There is provided a position detection apparatus for detecting position of an image pickup device that outputs an output signal corresponding to intensity of detected light, having a light source for generating light, an illumination lens for illuminating the light generated by the light source onto the image pickup device, a position detecting section for detecting relative position of the image pickup device with respect to the illumination lens based on the output signal outputted out of the image pickup device corresponding to the light received via the illumination lens and a moving section for changing the relative position of the image pickup device to position set in advance by moving at least one of the image pickup device and the illumination lens based on the relative position detected by the position detecting section.