Digital camera lens mould set regulating method
A lens module, digital camera technology, applied in installation, television, optics, etc., can solve problems such as uneven force, affect adjustment accuracy, affect image shooting quality, etc., and achieve the effect of precise adjustment
Inactive Publication Date: 2005-06-08
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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This situation will lead to uneven illumination of the incident light received by the image sensor, causing one side of the image to be brighter and the other side to be darker, thereby affecting the quality of image capture
For example: the patent No. 02230734 announced by the China Intellectual Property Office on December 5, 2001 discloses a lens module, which uses elastic components and screws between the base and the circuit board to adjust the focus. Due to the uneven stress of different elastic components and the deformation of elastic components will cause the image sensor to tilt
[0003] There is a structure to improve this situation in the existing adjustment technology, for example: the patent No. 02230734 announced by the China Intellectual Property Office on May 7, 2003 discloses a sensor positioning device for a digital camera. The positioning block is set in the housing of the base of the lens module to position the image sensor and keep it level. This structure is limited by the manufacturing precision of the components and affects the adjustment accuracy, such as the length of the positioning block, etc., which cannot be precisely controlled. Image sensor stays level
In addition, this structure needs to increase the complexity of the mechanism of the lens module, thereby increasing the difficulty and cost of manufacturing
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[0013] Please refer to figure 1 and figure 2 As shown, the digital camera lens module adjustment method provided by the present invention is an optical adjustment method, and the main applied optical principle is the law of the fourth power of cosine, which means that off-axis rays (light rays that are not parallel to the optical axis) The illuminance ratio of the imaging a' on the plane and the illuminance ratio of the light incident parallel to the optical axis pp' of the lens group 10 on the focal plane p' is proportional to the fourth power of the angle θ between the off-axis light and the optical axis pp' . Therefore, when the illuminance of each point of the object ap is the same, the illuminance ratio of the off-axis ray at the imaging point a' on the focal plane and the illuminance ratio of the incident ray incident along the optical axis on the focal plane at the imaging point is COS 4 theta.
[0014] Please refer to image 3 As shown, the adjustment steps of thi...
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The invention discloses a method for adjusting digital cameral lens. Use the lens model of digital camera to be adjusted to take photo of the subject with average illumination; measure , compare and analyze the relative illumination of the points on the image sensor, take the corresponding measures for adjusting the image sensor and verticality of optical axial by in accordance with law of fourth power cosines deducing the direction tilt and angle of tilt the image sensor.
Description
【Technical field】 [0001] The invention relates to a digital camera lens module adjustment method for adjusting the optical axis alignment of an image sensor and a lens group. 【Background technique】 [0002] With the continuous development of digital technology, digital cameras have been widely used by people. Especially in recent years, portable electronic devices such as mobile phones and PDAs (Personal Digital Assistants) are also rapidly developing towards high performance and multifunctional directions. Digital cameras and the The combination of such portable electronic devices has become the key to the development of mobile multimedia technology. The digital camera combined with the portable electronic device is small in size and simple in structure. The lens module manufacturing and maintenance assembly process is vulnerable to component manufacturing and assembly errors Due to the influence of the lens module, the optical axis of the image sensor of the lens module an...
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Inventor 孙文信张仁淙邱文赐李俊佑江宗韦
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD