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Lenses, fingerprint recognition devices and electronics
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A technology for fingerprint identification and electronic equipment, which is used in character and pattern recognition, acquisition/organization of fingerprints/palmprints, and print image collection, etc.
Active Publication Date: 2021-07-23
SHENZHEN GOODIX TECH CO LTD
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A typical off-screen optical fingerprint technology is based on the principle of light collimation. In the under-screen optical fingerprint module based on the principle of light collimation, the light collimation unit is composed of periodically distributed deep hole units. The ratio of the hole diameter to the hole depth of the deep hole unit is the aspect ratio. The resolution of the optical fingerprint module is determined by the period of the optical collimation unit and the aspect ratio. If the size of the optical fingerprint module is limited, the fingerprint The resolution of identification is low, which affects the accuracy and security of fingerprint identification
Method used
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[0173] In this first embodiment, the first lens 401 is a lens with negative refractive power, the second lens 402 is a lens with positive refractive power, the third lens 403 is a lens with positive refractive power, and the fourth lens 404 is A positive power lens, at least one surface of the lens is aspherical, and the optical parameters of the lenses in the lens satisfy the relationship described in the foregoing embodiments, specifically, the optical parameters of each lens in the lens The parameters are shown in Table 1, Table 2 and Table 3 respectively.
[0185] In this second embodiment, the first lens 401 is a lens with negative refractive power, the second lens 402 is a lens with positive refractive power, the third lens 403 is a lens with positive refractive power, and the fourth lens 404 is A positive power lens, at least one surface of the lens is aspherical, and the optical parameters of the lenses in the lens satisfy the relationship described in the foregoing embodiments, specifically, the optical parameters of each lens in the lens The parameters are shown in Table 4, Table 5 and Table 6 respectively.
[0196] In the third embodiment, the first lens 401 is a lens with negative refractive power, the second lens 402 is a lens with positive refractive power, the third lens 403 is a lens with positive refractive power, and the fourth lens 404 is A positive power lens, at least one surface of the lens is aspherical, and the optical parameters of the lenses in the lens satisfy the relationship described in the foregoing embodiments, specifically, the optical parameters of each lens in the lens The parameters are shown in Table 7, Table 8 and Table 9 respectively:
[0197] Table 7
[0198]
[0199]
[0200] Table 8
[0201]
[0202]
[0203] Table 9
[0204]
[0205] In this third embodiment, based on the optical parameters shown in Table 7 to Table 8, the parameters of the lens can be determined as follows: TTL=4.15 millimeters (that is, the distance from S2 to S16), the overall focal length f of the lens is 0.636 millimeters, the The FOV of the lens is 126 degree...
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Abstract
A lens (40,209,601), a fingerprint identification device (200,600) and an electronic device (10), the lens (40,209,601) comprising: a first lens (401), a second lens (402), Diaphragm, the third lens (403) and the fourth lens (404), wherein: the first lens (401) is a negative power lens, and the paraxial area on the image side surface of the first lens (401) is a concave surface, And at least one of the object-side surface and the image-side surface of the first lens (401) is an aspheric surface; the second lens (402) is a positive power lens, and the paraxial region on the object-side surface of the second lens (402) It is a convex surface, the paraxial region on the image side surface is concave, and at least one of the object side surface and the image side surface of the second lens (402) is aspheric; the third lens (403) is a positive power lens, and the second lens (402) The paraxial region on the object side surface of the three lenses (403) is a convex surface, the paraxial region on the image side surface is a convex surface, and at least one of the object side surface and the image side surface of the third lens (403) is an aspheric surface The fourth lens (404) is a positive refractive power lens, and the paraxial region on the object side surface of the fourth lens (404) is a convex surface, and at least one side of the object side surface and the image side surface of the fourth lens (404) is aspherical.
Description
technical field [0001] The embodiment of the present application relates to the field of optical imaging, and more specifically, relates to a lens, a fingerprint identification device, and an electronic device. Background technique [0002] With the development of fingerprint identification technology, the optical fingerprint technology under the screen has become a technical trend because it does not occupy the physical location on the electronic device. A typical off-screen optical fingerprint technology is based on the principle of light collimation. In the under-screen optical fingerprint module based on the principle of light collimation, the light collimation unit is composed of periodically distributed deep hole units. The ratio of the hole diameter to the hole depth of the deep hole unit is the aspect ratio. The resolution of the optical fingerprint module is determined by the period of the optical collimation unit and the aspect ratio. If the size of the optical fin...
Claims
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Application Information
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