Ultra-wide-angle lens

An ultra-wide-angle lens and lens technology, which is applied in the field of ultra-wide-angle lenses, can solve the problems of difficult design and high lens cost, and achieve the effects of long service life, reduced number of lenses, and excellent imaging quality

Pending Publication Date: 2020-07-10
SHENZHEN JIFU MEDICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, if the lens is too long or too short, its design will become difficult, and the manufacturing process requires higher requirements, which will lead to higher lens cost while improving the imaging quality.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] see figure 1 , is the super wide-angle lens provided in the first embodiment of the present invention. Wherein, in this embodiment, the lens focal length of the super wide-angle lens is f=0.46 mm, F / NO=3.0, 2ω=140°, and the depth of field is 5-40 mm. The first lens 11 and the third lens 14 are made of F52R material with a large Abbe number, and the second lens 12 is made of EP5000 material with a small Abbe number. This embodiment satisfies the above conditional formula, where TL / 2Y=2.77, f10, f2 / f=2.85, f3>0, f3 / f=2.02, in this embodiment The relevant parameters of each lens in the wide-angle lens are shown in Table 1.

[0056] Table 1

[0057]

[0058]

[0059] Table 2 shows the aspheric coefficients of the first lens 11 , the second lens 12 and the third lens 14 in this embodiment.

[0060] Table 2

[0061] face number S1 S2 S3 S4 S5 S6 A2 5.1778 -1.6637 -4.3338 -47.8895 62.4310 -1.2045 A4 0 0.0748 0.0685 0.0502 -1.1052 ...

Embodiment 2

[0067] The schematic diagram of the cross-sectional structure of the ultra-wide-angle lens provided in the second embodiment of the present invention is roughly the same as that of the first embodiment, except that the relevant parameters of each lens of the ultra-wide-angle lens in this embodiment are related to those of each lens in the first embodiment. There are differences in parameters, wherein, in this embodiment, the lens focal length of the super wide-angle lens is f=0.45mm, F / NO=3.5, 2ω=140°. The first lens 11 and the third lens 14 are made of F52R material with a large Abbe number, and the second lens 12 is made of EP5000 material with a small Abbe number. This embodiment satisfies the above conditional formula, where TL / 2Y=2.65, f10, f2 / f=2.73, f3>0, f3 / f=2.1, in this embodiment The relevant parameters of each lens in the wide-angle lens are shown in Table 3:

[0068] table 3

[0069]

[0070]

[0071] Table 4 shows the aspheric coefficients of the first le...

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Abstract

The invention applicable to the technical field of lenses provides an ultra-wide-angle lens, which sequentially comprises a first lens, a second lens, a fixed diaphragm and a third lens from an objectside to an imaging surface along an optical axis. The first lens has a negative refractive index, and two surfaces of the first lens are concave surfaces; the second lens has a positive refractive index, and the two surfaces of the second lens are convex surfaces; the third lens has a positive refractive index and is a meniscus lens with a concave surface facing the object side, at least one surface of each of the first lens, the second lens and the third lens is an aspheric surface, and the optical centers are located on the same straight line. The ultra-wide-angle lens meets the conditionalexpression that TL / 2Y is larger than 2.5 and smaller than 3.0, wherein the TL is the total optical length of the ultra-wide-angle lens, the 2Y is the imaging height of the maximum use field angle ofthe whole ultra-wide-angle lens on the imaging surface. According to the ultra-wide-angle lens provided by the invention, miniaturization and light weight can be realized under the condition of a large field angle; and meanwhile, the ultra-wide-angle lens has good optical performance.

Description

technical field [0001] The invention belongs to the technical field of lenses, in particular to a super wide-angle lens. Background technique [0002] At present, subjects can collect images in the digestive tract by taking a capsule endoscope with a built-in image acquisition and wireless communication device, and doctors use external instruments to receive images taken by the capsule endoscope to understand the digestive tract of the subject. situation to make a diagnosis of the condition. Capsule endoscopy has the advantages of convenient inspection, no trauma, no wires, no pain, no cross-infection, and does not affect the normal work of patients. It can be used as the preferred method for the diagnosis of digestive tract diseases, especially small intestinal diseases. [0003] Of course, it can be easily seen from the above that the quality of the gastrointestinal images captured by the capsule endoscope directly affects the effect of the capsule endoscopy. However, i...

Claims

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Application Information

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IPC IPC(8): G02B13/06G02B13/18
CPCG02B13/0035G02B13/06
Inventor 王川王建平刘少平
Owner SHENZHEN JIFU MEDICAL TECH CO LTD
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