Prime lens

A fixed-focus lens and lens technology, applied in the field of fixed-focus lenses, can solve problems such as image lag and shooting frame rate reduction

Pending Publication Date: 2019-07-12
DONGGUAN YUTONG OPTICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At night and dusk, greater light means better shooting results. The current mainstream lens aperture is F1

Method used

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Embodiment Construction

[0032] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for ease of description, the drawings only show part of the structure related to the present invention, but not all of the structure.

[0033] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. It should be noted that the “up”, “down”, “left” and “right” described in the embodiments of the present invention are described from the angle shown in the drawings, and should not be construed as implementing the present invention. Limitations of examples. In addition, in the context, it should also be understood that when it is mentioned that an element is for...

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Abstract

The embodiment of the invention discloses a prime lens. The prime lens includes a first lens with negative light focal power, a second lens with negative light focal power, a third lens with positivelight focal power, a diaphragm, a fourth lens with negative light focal power, a fifth lens with positive light focal power, a sixth lens with positive light focal power, a seventh lens with negativelight focal power, and an eighth lens with positive light focal power, which are arranged successively along an optical axis from an object side to an image side, wherein the fourth lens and the fifthlens form an adhesive lens; the first lens, the fourth lens, the fifth lens, and the sixth lens are spherical lens; and the second lens, the third lens, the seventh lens, and the eighth lens are non-spherical lens. The technical scheme of the embodiment of the invention can be applicable to the field of security and defense. The lens has the characteristics of day and night confocal function, excessive large amount of light and an ultra-wide angle, especially suitable for use under a low illumination condition.

Description

Technical field [0001] The embodiment of the present invention relates to optical device technology, in particular to a fixed focus lens. Background technique [0002] With the improvement of people's safety awareness, there are also higher levels of requirements for security, and surveillance cameras were born. Compared with the zoom lens, the fixed focus lens is simple in design and manufacturing, the image of the moving object is clear and stable, and the picture is delicate, which makes it occupy an important position in the security monitoring industry. [0003] The current solution for night shooting of security cameras is dual-band confocal technology, that is, when there is sufficient light during the day, the camera adopts a visible light receiving mode; when in a low-light environment at night, the camera adopts a combined visible light and infrared (850nm) mode for monitoring , In order to ensure a greater amount of light; in order to achieve this function, the lens is ...

Claims

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Application Information

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IPC IPC(8): G02B13/14G02B13/18G02B13/06
CPCG02B13/0045G02B13/008G02B13/06
Inventor 张品光米士隆何剑炜
Owner DONGGUAN YUTONG OPTICAL TECH
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