A high-quality internal focusing optical imaging system

An optical imaging system and image quality technology, applied in the field of internal focus optical imaging systems, to achieve the effects of small optical performance, improved color reproduction, and less changes in back focus

Active Publication Date: 2018-10-09
UNION OPTECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, in order to reduce the aberration variation and the change of the focal power generated when the focus group moves internally, it is more preferable to configure the negative lens focus group on the side of the optical imaging system close to the image side. The existing optical imaging system It is difficult to meet the above requirements at the same time

Method used

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  • A high-quality internal focusing optical imaging system
  • A high-quality internal focusing optical imaging system
  • A high-quality internal focusing optical imaging system

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Experimental program
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Embodiment Construction

[0027] The present invention will be further described below in conjunction with accompanying drawing:

[0028] A high-quality internal focusing optical imaging system, which is provided with a fixed first lens group with positive refractive power, an aperture diaphragm 11, and a negative optical focal lens group that can move along the optical axis and is arranged sequentially from the object side. The second lens group with high degree, the third lens group with fixed positive refractive power, the optical filter 9, and the photosensitive chip 10.

[0029]The first lens group includes in turn: a first lens 1, a second lens 2, a third lens 3, and a fourth lens 4, and the second lens group includes a fifth lens 5, a sixth lens 6, and a seventh lens in turn. 7. The third lens group includes an eighth lens 8 .

[0030] The first lens 1 is a negative glass lens, and the side of the first lens 1 facing the object side is a hyperbolic aspheric surface, and the side facing the imag...

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Abstract

The invention discloses a high-image-quality internal focusing optical imaging system. Key points of the technical scheme are that the optical imaging system sequentially comprises a first lens group, an aperture diaphragm, a second lens group, a third lens group, a filter and a light sensing chip from an object side to an image side, wherein the first lens group is fixed and has positive focal power, the second lens group can move along the direction of an optical axis and has negative focal power, and the third lens group is fixed and has positive focal power. The optical imaging system disclosed by the invention is provided with the first lens group with the positive focal power, the aperture diaphragm, the second lens group with the negative focal power and the third lens group with the positive focal power which are sequentially configured from the object side. The second lens group is composed of a double-gluing lens and an aspherical lens with negative focal power, and the second lens group is enabled to move along the optical axis so as to carry out focus adjustment from an infinite focusing state to a nearest object focusing state.

Description

【Technical field】 [0001] The invention relates to an optical imaging system, in particular to a small-volume, high-quality internal focus optical imaging system applied to a mirrorless camera system. 【Background technique】 [0002] In recent years, digital cameras such as interchangeable mirrorless cameras have been developing towards miniaturization and lightening of the fuselage, while ensuring a longer flange focus at the same time, so the compactness of the camera system And high performance has put forward extremely high requirements. In addition, if a digital camera needs to meet the needs of moving image photography, it is expected that the camera system can perform high-speed auto-focus processing for moving image photography, so the focus group should also try to ensure small aperture and light weight. In addition, in order to reduce the aberration variation and the change of the focal power generated when the focus group moves internally, it is more preferable to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B15/173G02B7/04G02B7/02G03B13/32
CPCG02B7/025G02B7/04G02B15/173G03B13/32
Inventor 瞿勇肖明志
Owner UNION OPTECH
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