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Video camera high-definition zoom lens with rear group distance adjustment and method for rear group distance adjustment of the lens

A zoom lens and distance adjustment technology, which is applied in the field of high-definition zoom lenses for video cameras, can solve problems such as difficult to obtain image quality, and achieve the effects of miniaturization, good image quality, and clear images

Active Publication Date: 2017-05-24
福建省光学技术研究所 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The zoom method of the linkage between the second group and the fourth group needs to be carried out with the linkage movement data of the second group and the fourth group with different close-up distances set in advance, and it is also difficult to obtain good results at a shorter distance. image quality

Method used

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  • Video camera high-definition zoom lens with rear group distance adjustment and method for rear group distance adjustment of the lens
  • Video camera high-definition zoom lens with rear group distance adjustment and method for rear group distance adjustment of the lens
  • Video camera high-definition zoom lens with rear group distance adjustment and method for rear group distance adjustment of the lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach ( 1

[0057] Such as figure 2 - Figure 4 As shown, a rear-group adjustable-pitch video camera high-definition zoom lens provided by the present invention is characterized in that: the lens includes a front fixed lens group A, a front fixed lens group with a positive focal length and which are sequentially arranged on the main optical axis along the light incident direction. A zoom lens group B with a negative focal length, a compensation lens group C with a positive or negative focal length, an aperture D, and a rear fixed lens group E with a positive focal length. The lens also includes a rear fixed lens group E and an image plane G. The rear distance adjustment lens group F, the focal length of the rear distance adjustment lens group F is positive and can move back and forth between the rear fixed lens group E and the image plane G to adjust the image of the object when the object distance changes. The image presented at the position of the image plane G is clear, the zoom lens gr...

Embodiment

[0096] Such as image 3 As shown, the focal lengths of the five lens groups are respectively f'front=62.100mm, f'change=-16.398mm, f'complement=-32.02mm, f'back=29.814mm, and f'adjustment=28.525mm. The total optical length L=128.75mm. Relative aperture D / f=1:2.1 (short focal length ~ 1:2.4 long focal length, adjusted by variable diaphragm. Image size ￠6.6mm1 / 2.7" imaging device. Table 2 shows the optical structure of the optical zoom lens device of the present invention Data, where R represents the radius of each lens surface, d represents the thickness of each lens or the air space between each lens. Table 3 is the air space displacement of different focal length zoom and compensation groups.

[0097]

[0098]

[0099]

[0100] Table 1

[0101] focal length 8.0114.9635.0145.4263.97 D51.49116.19829.96133.07136.37 D932.24415.9092.5880.9771.003 D134.7656.3935.9444.4511.125

[0102] Table 2

[0103]

[0104]

[0105] table 3

[0106]

[0107] Table 4

[0108] Table 4 shows the relat...

Embodiment approach ( 2

[0110] A rear group distance adjustment method for a video camera high-definition zoom lens with rear group distance adjustment, which is characterized in that: the method is provided with a front fixed lens group whose focal length is positive and which are sequentially arranged on the main optical axis along the light incident direction in the lens A. Zoom lens group B with negative focal length, compensation lens group C with positive or negative focal length, diaphragm D, and rear fixed lens group E with positive focal length, and between the rear fixed lens group E and image plane G Set up the rear distance adjustment lens group F that has a positive focal length and can move back and forth between the rear fixed lens group E and the image plane G. When the object distance changes, the lens is realized by linkage of the zoom lens group B and the compensation lens group C The focal length is changed, and the image formed by the object is adjusted by moving the distance adjus...

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Abstract

The invention relates to a rear group adjusting video shooting high-definition zoom lens and a rear group adjusting method for the lens. The lens comprises a front fixed lens group with a positive focal length, a zoom lens group with a negative focal length, a compensating lens group with a positive or negative focal length, a diaphragm and a rear fixed lens group with a positive focal length, and the front fixed lens group, the zoom lens group, the compensating lens group, the diaphragm and the rear fixed lens group are arranged on a main optical shaft in order in light incident direction. The lens also comprises a rear adjusting lens group located between the rear fixed lens group and an image surface. The rear adjusting lens group has a positive focal length and can move back and forth between the rear fixed lens group and the image plane to adjust an image formed by an object when an object distance is changed and thus the image shown in the image plane position is clear. The zoom lens group and the compensating lens group are in linkage connection and achieve change of the lens focal length. In the method, a focal length is adjusted through the rear adjusting lens group. Better image quality can be obtained in a near distance when the provided method is compared with a front group adjusting method. During the focusing process, the caliber of the lens front group is not changed, the whole length of the lens is not changed, and the combined focal length of the lens is not changed basically.

Description

Technical field [0001] The present invention relates to the field of camera lenses, in particular to a rear-group distance adjustment video camera high-definition zoom lens and a rear group distance adjustment method of the lens. Background technique [0002] At present, most video surveillance zoom camera lenses use the second group of zoom, the third group of compensation or the second group of zoom, the fourth group of compensation. In order to observe close-range scenery, the second group of zoom and the third compensation plan adopt the first group (the former group) method of distance adjustment; the second group of zoom and the fourth compensation plan adopt the second group Adjust the pitch in conjunction with the fourth group. Using the first group (front group) method of distance adjustment, at the telephoto end, it is more difficult to obtain good image quality when observing a scene within 1 meter, and as the object distance decreases, the aperture of the front group...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B15/15
Inventor 赖爱光王新夏齐海赖英辉林孝同
Owner 福建省光学技术研究所
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