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Varifocal lens

A lens and focal length technology, applied in the direction of lenses, instruments, optics, etc., can solve problems such as unnegligible impact and achieve high lens performance

Active Publication Date: 2015-12-30
THE UNIV OF TOKYO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In general, in a lens using a liquid interface shape, if the lens diameter is increased, the influence of gravity acting on the liquid is more dominant than the surface tension of the liquid, so the influence of gravity on the lens shape cannot be ignored

Method used

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no. 1 approach

[0080] (Operation of the first embodiment)

[0081] Next, the operation of the variable focal length lens of this embodiment will be described.

[0082] First, in the initial state, the pressure difference between the first medium 3 and the second medium 4 is 0 [Pa]. That is, the hydrostatic pressures of the two are equal. In this state, the first elastic membrane 2 is between the first medium 3 and the second medium 4 and is in a flat state (that is, curvature=0 or radius of curvature=∞). in figure 1 In the figure, the first elastic membrane 2 in this state is indicated by a two-dot chain line.

[0083] Here, in the conventional variable focus lens, it is caused by the slight density difference between the two media, and under the influence of gravity, the elastic film between the media is inadvertently deformed slightly. Therefore, in the conventional lens, particularly when the lens power is small (that is, the curvature of the film is small), the optical performance cannot be ...

no. 2 approach

[0101] Next, refer to Figure 5 The variable focal length lens of the second embodiment of the present invention will be described. In the description of the second embodiment, components that are basically common to those of the lens of the first embodiment are marked with the same symbols to avoid troublesome description.

[0102] The variable focal length lens of the second embodiment further includes a second elastic film 7, a third medium 8, and a second tension applying portion 9. In addition, the storage unit 1 of the present embodiment further includes a third space 16.

[0103] The third space 16 is arranged at a position along the optical axis 100 direction with respect to the first space 13 and the second space 14. More specifically, the third space is an area surrounded by the second elastic membrane 7, the second window portion 12 and the side wall 15.

[0104] The second elastic film 7 is configured to be arranged between the second space 14 and the third space 16, a...

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Abstract

This invention provides a varifocal lens that can exhibit high lens performance even at a low lens power. Also, this invention provides a varifocal lens that allows a comparatively large aperture. In this invention, a first elastic membrane is positioned between a first medium and a second medium. Said first elastic membrane is made able to elastically deform due to pressure from the first medium or the second medium. A drive unit changes the radius of curvature of the first elastic membrane by varying the pressure or volume of the first or second medium. A first tension-applying part applies isotropic tension to the first elastic membrane.

Description

Technical field [0001] The present invention relates to a variable focal length lens. Background technique [0002] The following Patent Document 1 and Non-Patent Document 1 describe a variable focus lens having a structure in which an elastic film is arranged at the boundary between the first liquid and the second liquid. In this lens, the refractive index of the first liquid is different from the refractive index of the second liquid, and the elastic film is used to ensure the shape of the boundary surface of the two liquids. [0003] In this variable focus lens, by applying pressure to one of the liquids (for example, the second liquid), the curvature of the elastic membrane (that is, the curvature of the interface shape between the two liquids) can be changed, thereby enabling adjustment as The refractive power of the lens (the so-called lens power). [0004] Generally, in a lens using a liquid interface shape, if the diameter of the lens is increased, the influence of gravity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B3/14G02B13/00
CPCG02B3/14G02B27/0025
Inventor 奥宽雅王立辉石川正俊
Owner THE UNIV OF TOKYO
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