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Wide angle lens

A wide-angle lens and lens technology, applied in television, optics, instruments, etc., can solve problems such as insufficient correction of astigmatism and chromatic aberration of magnification, and achieve high position accuracy, cost reduction, and correction of image plane curvature

Active Publication Date: 2019-07-23
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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Examples

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

This wide angle lens (100) appropriately corrects chromatic aberration by raising the positional accuracy of a third lens (30) and a fourth lens (40) which are disposed on the object side with respectto an aperture (81). More specifically, the wide angle lens (100) has a five-group and seven-sheet configuration, wherein, on the image side with respect to the aperture (81), a fifth lens (50) comprising a positive lens and a second cemented lens (120) comprising a sixth lens (60), and a seventh lens (70) are disposed. On the object side with respect to the aperture (81), the third lens (30) andthe fourth lens (40) constitute a first cemented lens (110). In the first cemented lens (100), an end section (465), which comprises the inner circumferential surface of a recess section (462) provided on the fourth lens (40), contacts the outer circumferential surface (365) of a protrusion section (362) of a flange part (36) of the third lens (30), thereby defining positions.

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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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