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wide angle lens

A wide-angle lens and lens technology, which is applied in the direction of instruments, TVs, TV system components, etc., can solve problems such as insufficient correction of astigmatism and chromatic aberration of magnification

Inactive Publication Date: 2021-06-15
SANKYO SEIKI MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, simply disposing a cemented lens on the image side with respect to the aperture is insufficient to correct astigmatism and lateral chromatic aberration at the periphery.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0066] (Structure of wide-angle lens 100)

[0067] figure 1 It is a sectional view of the lens unit 150 provided with the wide-angle lens 100 according to Embodiment 1 of the present invention. figure 2 yes means figure 1 It is an explanatory drawing of the surface number etc. of the wide-angle lens 100 shown. also, figure 2 When the middle indicates the surface number, "*" is marked on the aspheric surface.

[0068] Such as figure 1 As shown, the lens unit 150 (wide-angle lens unit) of this embodiment has the wide-angle lens 100 and the holder 90 holding the wide-angle lens 100 inside. In the present embodiment, the wide-angle lens 100 is configured as a wide-angle lens having a horizontal viewing angle of 150° or greater.

[0069] Such as figure 1 and figure 2 As shown, the wide-angle lens 100 is composed of a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a diaphragm 81, a fifth lens 50, and a sixth lens 60, which are sequentially arranged fr...

Embodiment approach 2

[0158] Figure 9 It is an explanatory diagram showing surface numbers and the like of the wide-angle lens 100 according to Embodiment 2 of the present invention. Figure 10 yes means Figure 9 An explanatory diagram of spherical aberration of the wide-angle lens 100 shown. Figure 11 yes means Figure 9 The explanatory diagram of the lateral chromatic aberration of the wide-angle lens 100 shown shows the lateral chromatic aberration at the maximum viewing angle (96.6562° / half angle). Figure 12 yes means Figure 9 An explanatory diagram of astigmatism and distortion of the wide-angle lens 100 shown. Figure 13 yes means figure 1 An explanatory diagram of lateral aberration of the wide-angle lens 100 shown. Figure 10 , Figure 11 , Figure 12 Each aberration of red light R (wavelength 656 nm), green light G (wavelength 588 nm), and blue light B (wavelength 486 nm) is shown in . Figure 13 Also shown in the figure are red light R (wavelength 656nm), green light G (wave...

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Abstract

A wide-angle lens (100) appropriately corrects chromatic aberration by improving the positional accuracy of a third lens (30) and a fourth lens (40) disposed on the object side with respect to an aperture (81). More specifically, the wide-angle lens (100) has a lens structure of 7 lenses in 5 groups. With respect to the aperture (81), on the image side, a fifth lens (50) consisting of a positive lens and a sixth lens (60) are arranged. and the second cemented lens (120) constituted by the seventh lens (70). The third lens (30) and the fourth lens (40) constitute a first cemented lens (110) on the object side with respect to the diaphragm (81). In the first cemented lens (110), the difference between the stepped portion (465) formed on the inner peripheral surface of the concave portion (462) of the fourth lens (40) and the flange portion (36) of the third lens (30) The outer peripheral surface (365) of the protruding part (362) abuts to define the position.

Description

technical field [0001] This invention relates to wide-angle lenses for use in various imaging systems. Background technique [0002] Among wide-angle lenses, in order to obtain high resolution, wide-angle lenses having 5 elements in 4 groups or 6 elements in 5 groups in which a cemented lens is arranged on the image side with respect to the aperture have been proposed (see Patent Documents 1 and 2). However, merely arranging the cemented lens on the image side with respect to the diaphragm is insufficient to correct astigmatism and lateral chromatic aberration in the peripheral portion. On the other hand, there has been proposed a wide-angle lens of 7 elements in 6 groups in which four single lenses are arranged on the object side with respect to the aperture, and a positive single lens and a cemented lens are arranged on the image side with respect to the aperture (see Patent Document 3 ). [0003] prior art literature [0004] patent documents [0005] Patent Document ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/04G02B13/18
CPCG02B9/60G02B13/0045G02B13/04G02B13/06G02B13/18G02B9/64G02B13/006G02B13/16H04N5/74
Inventor 小宫山忠史
Owner SANKYO SEIKI MFG CO LTD