High-definition wide-angle small-distortion reversing lens
A wide-angle, high-definition technology that is used in optical filters, optics, and instruments for photography. It can solve the problems of large lens size, poor imaging, and curved image planes, and achieve bright and clear images, small focal lengths, and reduced distortion. Effect
Active Publication Date: 2014-09-10
信华精机有限公司
View PDF8 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
It uses 4 lenses, although it achieves better optical characteristics and a wider total field of view, but it has a longer total lens length, that is, the TTL is close to 25mm, resulting in a larger lens size, and its distortion is still 50 %about
On the other hand, the existing reversing lens still has the problem of poor imaging, the image plane is curved and unclear
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment
[0035] Such as figure 1 As shown, this embodiment provides a high-definition wide-angle small-distortion reversing lens, including a first lens 1 with negative refractive power, a second lens 2 with negative refractive power, and coaxially arranged in sequence from the object end to the imaging surface. The third lens 3 and the fourth lens 4, an aperture element 5 and an optical filter 6, wherein the first lens 1 is a meniscus glass spherical lens, and the concave surface faces the optical filter 6; the second lens 2 is a meniscus type plastic aspheric lens, the concave surface faces the filter 6; the third lens 3 is a glass double-convex spherical lens, the fourth lens 4 is a plastic aspheric double-convex lens, and the aperture element 5 is arranged between the third and fourth lens elements , the filter is located between the fourth lens and the imaging surface, and the high-definition wide-angle small distortion reversing lens satisfies the following condition: TTL<20mm, w...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a high-definition wide-angle small-distortion reversing lens, which is characterized by comprising a first lens with negative focal power, a second lens with negative focal power, a third lens and a fourth lens sequentially coaxially arranged from the object end to the imaging surface. The third lens is a bi-convex spherical glass lens; the fourth lens is a plastic aspheric bi-convex lens; and a diaphragm element is arranged between the third lens and the fourth lens. The high-definition wide-angle small-distortion reversing lens meets the following condition: TTL is smaller than 20mm, wherein the TTL is the length of the entire reversing lens. According to the reversing lens meeting the above condition, the field angle is large, the focal length is small, a larger range can be ensured to be seen during the reversing process, higher resolving power and smaller distortion are provided, and the image is bright and clear.
Description
technical field [0001] The invention relates to an optical instrument, which belongs to the field of video monitoring, and specifically refers to a high-definition wide-angle small-distortion reversing lens. Background technique [0002] Visual information is one of the main sources for people to obtain information from the objective world, accounting for 70% of the information obtained by people relying on five sense organs. Therefore, the intuitive effect provided by images is beyond the reach of language and text descriptions. Video images are actually a continuous sequence of static images, which is a vivid and vivid description of objective things, and a more intuitive and specific way of expression. With the rapid development of network, communication and microelectronics technology, video surveillance system has been paid more and more attention by people because of its intuition, convenience and rich content. [0003] Today, as car safety is increasingly valued, mor...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G02B13/18G02B1/00G03B11/00
Inventor 黄福建宋勇范家忠陈婷
Owner 信华精机有限公司