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Eyepiece optical system, electronic viewfinder and image capturing device

An optical system and viewfinder technology, which is applied in the optical field, can solve the problems of difficult combination of large viewing angle and high performance, and low viewing angle and optical performance of electronic viewfinders, so as to improve optical performance, improve eccentricity sensitivity, Guarantee the effect of image quality

Pending Publication Date: 2020-03-31
厦门松下电子信息有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For cameras currently on the market, due to size control, the viewing angle and optical performance of the electronic viewfinders are relatively low. That is to say, it is difficult for the current electronic viewfinders to ensure a large viewing angle and high performance

Method used

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  • Eyepiece optical system, electronic viewfinder and image capturing device
  • Eyepiece optical system, electronic viewfinder and image capturing device
  • Eyepiece optical system, electronic viewfinder and image capturing device

Examples

Experimental program
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Effect test

Embodiment 1

[0110] Such as Figure 4aAs shown, the eyepiece optical system of the first embodiment includes a first lens group 71 and a second lens group 72, wherein the first lens group 71 includes a first lens 711 with negative refractive power, and the first lens 711 faces toward the side of the eye The surface is the first surface 7111 , and the surface facing the display side is the second surface 7112 . The second lens group 72 includes a second lens 721, a third lens 722, a fourth lens 723, and a fifth lens 724 arranged sequentially from the eye side to the display side. The second lens 721 has positive refractive power, and its surface facing the eye side is The first surface 7211, the surface facing the display side is the second surface 7212. The third lens 722 has positive refractive power, the surface facing the eye side is the first surface 7221 , and the surface facing the display side is the second surface 7222 . The fourth lens 723 has a negative refractive power, the su...

Embodiment 2

[0136] Such as Figure 7a As shown, the structure of the eyepiece optical system in the second embodiment is similar to that of the first embodiment, and also includes the first lens 711, the second lens 721, the third lens 722, the fourth lens 723 and the fifth lens 724, the difference is The fourth lens 723 is made of a material with a relatively high Abbe number, and the optical parameters of each lens are slightly different from the first embodiment.

[0137] Specifically, in the eyepiece optical system of the second embodiment, the focal length f11 of the first lens 711 is -105.71, the refractive index N11 is 1.517, the Abbe number N11 is 64.2, and the thickness T11 is 0.7. The focal length f21 of the second lens 721 is 34.22, the refractive index N21 is 1.583, the Abbe number N21 is 59.5, and the thickness T21 is 5.620. The focal length f22 of the third lens 722 is 17.1716, the refractive index N22 is 1.729, and the Abbe number V22 is 54.7 , the thickness T22 is 8.9947....

Embodiment 3

[0154] Such as Figure 10a As shown, the structure of the eyepiece optical system in the third embodiment is similar to that of the first embodiment, and also includes the first lens 711, the second lens 721, the third lens 722, the fourth lens 723 and the fifth lens 724, the difference is , the third lens 722 has a negative refractive power, and the fourth lens 723 has a positive refractive power, and the optical parameters of each lens are slightly different from those in Embodiment 1.

[0155] Specifically, in the eyepiece optical system of the third embodiment, the focal length f11 of the first lens 711 is -294.944, the refractive index N11 is 1.4875, the Abbe number N11 is 70.4, and the thickness T11 is 0.7. The focal length f21 of the second lens 721 is 16.5625, the refractive index N21 is 1.72916, the Abbe number N21 is 54.7, and the thickness T21 is 8.2336. The focal length f22 of the third lens 722 is -9.0130, the refractive index N22 is 1.6883, the Abbe number V22 i...

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Abstract

The invention relates to an eyepiece optical system, an electronic viewfinder, and an image capturing device. The light is imaged through the eyepiece optical system, the direction facing the eyes ofan observer is an eye side, and the other side of the eyepiece optical system is a display side. The eyepiece optical system is sequentially provided with a first lens group with negative refractive power and a second lens group with positive refractive power from the eye side to the display side. The first lens group is fixed, and the second lens group can move along the optical axis direction. The eyepiece optical system provided by the invention has strong positive refractive power and high optical performance. Meanwhile, the first lens group is arranged to be of a fixed structure, the second lens group is arranged to be capable of moving in the direction of the optical axis, and the structure is beneficial to adopting more optical mirror surfaces in a limited space, so that the opticalperformance of the eyepiece optical system in the electronic viewfinder is improved, and the space does not need to be increased. Therefore, the electronic viewfinder with the eyepiece optical systemhas the characteristics of large view angle, high optical performance and small size.

Description

technical field [0001] The present invention relates to the field of optics, in particular to an eyepiece optical system and an optical device using the eyepiece optical system, such as an electronic viewfinder equipped with the eyepiece optical system and an image capture device equipped with the electronic viewfinder. Background technique [0002] Since the debut of digital cameras, cameras equipped with EVF (Electronic Viewfinder) began to be commercialized. In the past, the OVF (Optical Viewfinder) observed the image of the object directly through the optical system. The working principle of the EVF is to convert the image captured by the main lens of the camera to the EVF display, and observe the image of the display with the naked eye through the optical system. [0003] Generally speaking, in order to make the larger picture seen on the electronic viewfinder, in order to clearly see the details in the picture, the electronic viewfinder must have a larger viewing angle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B25/00G02B13/00G02B13/06G02B13/18H04N5/225H04N5/232
CPCG02B25/001G02B13/0045G02B13/18G02B13/06H04N23/55H04N23/63
Inventor 詹晓晴
Owner 厦门松下电子信息有限公司