Day and night prime lens with large aperture of 12mm
A fixed-focus lens and large-aperture technology, used in optical components, optics, instruments, etc., can solve the problems that fixed-focus lens pixels and performance are difficult to meet market demand, increase the difficulty of product promotion, and increase product costs. Confocal, good image quality, large aperture effect
Active Publication Date: 2020-01-07
FUJIAN FORECAM OPTICS CO LTD
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Problems solved by technology
[0002] There are a variety of fixed-focus lenses with a focal length of 12mm on the market for use in security systems, but it is difficult to meet market demand in terms of pixels and performance due to the use of glass-designed fixed-focus lenses
In order to improve performance and increase pixe
Method used
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[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0019] like Figure 1-7 As shown, a 12mm large-aperture, fixed-focus lens for day and night, the optical system is provided with a front group A, a diaphragm C, and a rear group B in sequence along the object plane to the image plane, and the front group A goes from left to right along the light The incident direction includes meniscus lens A1 and meniscus lens A2 in turn; the rear group B includes biconcave lens B1, biconvex lens B2, biconvex plastic aspheric mirror B3, and biconcave plastic aspheric mirror B4 in sequence along the incident direction of light from left to right; The parallel plate glass is located in front of the image plane of the IMA.
[0020] In this embodiment, the air interval between the meniscus lens A1 and the meniscus lens A2 is 0.1 mm; the air interval between the biconcave lens B1 and the biconvex lens B2 is 0.79 m...
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The invention relates to a day and night prime lens with a large aperture of 12mm. An optical system is sequentially provided with a front group A, a diaphragm C and a rear group B from an object plane to an image plane, and the front group A sequentially comprises a meniscus lens A1 and a meniscus lens A2 in an incident direction of light from left to right; the rear group B sequentially comprises a biconcave lens B1, a biconvex lens B2, a biconvex plastic aspheric mirror B3 and a biconcave plastic aspheric mirror B4 in the incident direction of light from left to right; and parallel plate glass is located in front of an IMA image plane. The optical system has a larger aperture, day and night confocal effects are achieved, the requirement for the minimum illumination of CCD imaging can still be met at low illumination at night so that rapid imaging is achieved, good imaging quality is achieved in extreme environments of -30 DEG C to 70 DEG C and the like, and the lens can be used in cooperation with a CCD or CMOS chip with six million pixels.
Description
technical field [0001] The invention relates to a 12mm large-aperture fixed-focus lens for day and night. Background technique [0002] There are various fixed-focus lenses with a focal length of 12mm on the market, which are used in security systems. However, it is difficult for fixed-focus lenses designed with glass to meet market demand in terms of pixels and performance. In order to improve performance and increase pixels, more glass lenses are used to achieve higher-definition image quality, which greatly increases product costs and makes product promotion more difficult. At present, in the security industry, there are few low-cost, high-quality, large-aperture fixed-focus lenses that can be used both day and night. Contents of the invention [0003] The object of the present invention is to provide a 12mm large-aperture fixed-focus lens for day and night with a simple structure. [0004] The technical solution of the present invention is a 12mm large-aperture, fixe...
Claims
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Login to View More IPC IPC(8): G02B13/00G02B13/18G02B13/06
CPCG02B13/0045G02B13/06G02B13/18
Inventor 戴敏林张世忠张荣耀范智宇
Owner FUJIAN FORECAM OPTICS CO LTD