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Optical element, optical system, and imaging device

A technology of optical components and shooting devices, which is applied in the fields of optical components, optical systems and shooting devices, can solve problems such as damage to the flatness of the flange surface, and achieve the effect of suppressing the reduction of flatness

Inactive Publication Date: 2020-11-27
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the flatness of the flange surface is impaired

Method used

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  • Optical element, optical system, and imaging device
  • Optical element, optical system, and imaging device
  • Optical element, optical system, and imaging device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0027] figure 1 It is a figure which shows the optical element 10 of 1st Embodiment. figure 1 (a) is a sectional view, figure 1 (b) is a top view of the optical element 10 viewed from above.

[0028] The optical element 10 is a lens element made of glass. The optical element 10 has a convex first curved surface (optical function part) 11 and a second curved surface (optical function part) 14 facing the first curved surface 11 at the center. The surface of the first curved portion 11 is covered with an antireflection film 12 . The surface of the second curved portion 14 is covered with an antireflection film 15 .

[0029] The optical element 10 has a flange portion 13 outside the optical function portion. The antireflection film 12 also covers a part of the flange portion 13 . The antireflection film 12 covering the flange portion 13 has a radially convex shape in plan view in a part thereof (in the figure 1 In the illustrated example, the direction indicator 16 is a...

Embodiment approach 2

[0038] image 3 It is a figure which shows the optical element 30 of 2nd Embodiment. image 3 (a) is a sectional view, image 3 (b) is a top view of the optical element 30 viewed from above.

[0039] The optical element 30 is a lens element made of glass. The optical element 30 has a convex first curved surface (optical function part) 31 and a second curved surface (optical function part) 34 facing the first curved surface 31 at the center. The surface of the first curved portion 31 is covered with an antireflection film 32 . The surface of the second curved portion 34 is covered with an antireflection film 35 .

[0040] The optical element 30 has a flange portion 33 outside the optical function portion. In the first embodiment, the flatness of the flange surface is improved by reducing the area of ​​the antireflection film 12 covering the flange portion 13 . On the other hand, in the second embodiment, by increasing the area of ​​the antireflection film 32 of the flange...

Embodiment approach 3

[0049] Figure 5 It is a figure which shows the optical element 50 of 3rd Embodiment. Figure 5 (a) is a sectional view, Figure 5 (b) is a top view of the optical element 50 viewed from above.

[0050] The optical element 50 is a lens element made of glass. The optical element 50 has a convex first curved surface (optical function part) 51 and a second curved surface (optical function part) 54 facing the first curved surface 51 at the center. The surface of the first curved portion 51 is covered with an antireflection film 52 . The surface of the second curved portion 54 is covered with an antireflection film 55 .

[0051] The optical element 50 has a flange portion 53 outside the optical function portion. The antireflection film 52 also covers a part of the flange portion 53 . In addition, in this embodiment, the antireflection film 52 does not need to cover the flange portion 53 . In addition, the antireflection film 52 may not be present on the flange portion 53 . ...

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Abstract

This optical element (10) has a flange part (13) outside an optical function part. The optical function part and a portion of the flange part (13) are covered with a reflection prevention film (12). Adirection indication part (16) is formed as a projecting part of the reflection prevention film (12). The level difference between the direction indication part (16) and a flat surface of the flangepart (13) is 2 [Mu]m or less.

Description

technical field [0001] The invention relates to an optical element, an optical system and a photographing device. Background technique [0002] A lens unit used in a camera for mobile phones (including smartphones) and for vehicles is generally formed by stacking a plurality of lens elements in the optical axis direction in a lens barrel. It is necessary to assemble the lens unit in such a manner that the optical axes of the respective lens elements are not decentered from the central axis of the lens barrel (the optical axes are not shifted). [0003] Patent Document 1 describes an assembling method in which one lens element and the other lens element are fitted in a circumferential position, and when both lens elements are stacked, one lens element is determined to face the other lens element. The lens element on the other side rotates and does not produce a decentered position. [0004] According to the assembly method described in Patent Document 1, even if the aberrat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B7/02G02B1/11G02B3/00
CPCG02B1/11G02B7/021G02B7/026G02B7/004G02B7/022
Inventor 宫坂浩司佐藤弘昌
Owner ASAHI GLASS CO LTD