Lens module distortion measuring system and method
AssigneeHon Hai Precision Industry Co., Ltd.
InventorJen-Tsorng Chang
Life of this patent
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Abstract
A lens module distortion measuring system configured to measure the distortion of a lens module including: a light source configured to emit light rays; a diffusing panel configured to diffuse the light rays; a substantially opaque shielding plate beneath the diffusing panel, the shielding plate defining a regular matrix of light-passing holes capable of allowing some of the diffused light rays to pass therethrough; an image capturing device configured to capture a image of the shielding plate as viewed through the lens module, the image comprising an array of light spots corresponding to the light-passing holes; and a computing unit electrically connected to the image capturing device and configured to analyze the light spots of the image and thereby determine the distortion of the lens module.
Claims12
A lens module distortion measuring system, comprising:
- a light source configured to emit light rays;
- a diffusing panel beneath the light source and configured to diffuse the light rays;
- a substantially opaque shielding plate beneath the diffusing panel, the shielding plate defining a regular matrix of light-passing holes;
- an image capturing device configured to capture an image of the shielding plate as viewed through the lens module, the image comprising an array of light spots corresponding to the light-passing holes;
- and
- a computing unit electrically connected to the image capturing device and configured to analyze the light spots of the image and thereby determine the distortion of the lens module, wherein the computing unit calculates a first average distance between adjacent light spots in a central portion of the image, and a second average distance between adjacent light spots in a peripheral portion of the image, and the distortion of the lens module is the ratio of the second average distance to the first average distance.
A lens module distortion measuring method, comprising:
- optically coupling a lens module to an image capturing device;
- capturing an image as viewed through the lens module, the image comprising an array of light spots corresponding to a regular matrix of light-passing holes;
- calculating a first average distance between adjacent light spots in a central portion of the image, and a second average distance between adjacent light spots in a peripheral portion of the image;
- and
- determining the distortion of the lens module to be the ratio of the second average distance to the first average distance.
Dependencies are inferred from the claim text.