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Light ray path folding structure for an imaging system, and electronic device comprising said imaging system

A folding structure and light path technology, applied in optics, optical components, instruments, etc., can solve the problems of performance degradation and achieve the effect of long focal length, wide light path, and small external size

Pending Publication Date: 2021-04-16
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the secondary mirror obscures the central portion of the entrance aperture of the system, leaving only the annular entrance aperture, which significantly degrades performance compared to designs that include a completely open entrance aperture

Method used

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  • Light ray path folding structure for an imaging system, and electronic device comprising said imaging system
  • Light ray path folding structure for an imaging system, and electronic device comprising said imaging system
  • Light ray path folding structure for an imaging system, and electronic device comprising said imaging system

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Embodiment Construction

[0037] figure 1 A prior art imaging system is shown in which the ray paths extend substantially along a central axis of the imaging system having a focal length corresponding to the actual outer dimensions of the imaging system, as seen along the central axis of the imaging system, Therefore, when the imaging system is used in electronic devices such as mobile phones or tablet computers, it can only have a very short focal length.

[0038] Figure 7 shows an imaging system according to the present invention, due to the Figure 3 to Figure 6 The light path folding structure 1 shown in more detail in , the focal length of the imaging system is much longer than the external dimensions of the imaging system.

[0039] The folded structure 1 comprises a reflective channel 2 with a central axis C extending between a first end 3 of the folded structure 1 and a second end 4 of the folded structure 1 . The surface (ie plane) of the first end 3 and the surface (ie plane) of the second e...

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Abstract

A light ray path folding structure (1) comprises a reflection passage (2), a center axis (C) of the reflection passage (2) extending between a first end (3) and a second end (4). A light ray path (5) enters the folding structure (1) at an angle (beta) such that the width (Y) of the light ray path (5) when passing perpendicularly through the plane of the first end (3) equals the width (X) of the light ray path (5) when entering the folding structure (1) multiplied by the square root of the width (X), such that Y=(square)root2*X. The light ray path (5) is folded at least once within the reflection passage (2) by means of at least one reflective surface (6) extending in parallel with the center axis (C). A light ray path folding structure allows the electronic device, comprising the folding structure, to have a thin form factor while still having an imaging system with long focal length.

Description

technical field [0001] The invention relates to a light path folding structure used in an imaging system of an electronic device. Background technique [0002] Imaging systems for portable electronic devices present several difficulties. Electronic devices such as mobile phones preferably have the smallest possible external dimensions, while imaging systems require certain dimensions in order to provide good enough image sharpness, spatial frequency, sensitivity, etc. [0003] One problem concerns how to provide a mobile camera with a very long focal length, eg equivalent to a conventional 280mm lens system. [0004] Attempts have been made to solve this problem by folding the ray paths, such as the Cassegrain double reflection system. A Cassegrain embodiment includes a parabolic primary mirror and a hyperbolic secondary mirror that reflects light back down through an aperture in the primary mirror. By folding the light path, the design is more compact. [0005] However,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G02B17/02
CPCG02B13/0065G02B13/007G02B13/02G02B17/023G02B17/045
Inventor 米科·朱霍拉
Owner HUAWEI TECH CO LTD
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