Varifocal lens of micro-fluid control liquid based on ionic liquid

An ionic liquid and liquid lens technology, which is applied to lenses, optics, instruments, etc., can solve the problems of increased thickness of the insulating layer, failure to work properly, breakdown of the insulating layer, etc., and achieve the effects of reduced driving voltage, easy fabrication, and simple structure.

Inactive Publication Date: 2011-06-22
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the high voltage will lead to the breakdown of the insulating layer, and the reduction of the thickness of the insulating layer will obviously increase the difficulty of the process and affect the life of the device.
The method of simply reducing the voltage or reducing the thickness of the insulating layer is limited
In addition, the conductor salt solution used in the above-mentioned liquid lens has very high requirements on the ambient temperature, and cannot work normally at extremely high or low temperatures
Therefore, the traditional zoom liquid lens based on electrowetting is difficult to replace the traditional optical system

Method used

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  • Varifocal lens of micro-fluid control liquid based on ionic liquid
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  • Varifocal lens of micro-fluid control liquid based on ionic liquid

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specific Embodiment 1

[0035] Embodiment 1: According to the present invention, the refractive index and surface tension of the ionic liquid used in the conductive solution of the liquid lens are greater than that of the insulating fluid. The ionic liquid can be C 8 h 15 IN 2 (density 1.2124g / cm 3 , refractive index 1.572, surface tension 54.7mN / m), the insulating fluid uses KF56 silicone oil (density 0.995g / cm 3 , refractive index 1.497, surface tension 26.5mN / m) and a small amount of organic additive phenyl bromide (density 1.495g / cm 3 , a mixture with a refractive index of 1.5590 and a surface tension of 38.14mN / m). The density difference between the conductor and the insulating fluid is adjusted by the mixing ratio of silicone oil and organic additives. The difference in viscosity can be adjusted by adding a surfactant to the conductor.

specific Embodiment 2

[0036] Embodiment 2: The refractive index and surface tension of the ionic liquid used in the conductive solution of the liquid lens according to the present invention are both lower than those of the insulating fluid. The conductive fluid adopts ionic liquid [Bmim]BF with small surface tension and refractive index 4 (density 1.120g / cm 3 , Refractive index 1.42, surface tension 46.6mN / m), the insulating fluid adopts phenylmethylsiloxane with high refractive index and good electrowetting performance. The density difference between the conductive fluid and the insulating fluid is determined by dissolving several percent carbon tetrabromocompounds in phenylmethylsiloxane (ρ=2.96g / cm 3 ) to adjust, the refractive index of the mixed insulating fluid is about 1.55 and the surface tension is greater than that of the conductive fluid. The difference in viscosity can be adjusted by adding a surfactant to the conductor.

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Abstract

The invention relates to a varifocal lens of a micro-fluid control liquid based on an ionic liquid, and the basic structure of the lens can contain the conductive inner core of a lens pore of conductive fluid and insulating fluid. In the invention, an inner core (3) is a conductive slab with cylindrical through holes; all surfaces are coated with an insulating layer (7) and a hydrophobic layer (8); an upper cover plate (1) and a lower cover plate (2) and the gaps among the through holes form a lens cavity which is used for storing a liquid lens material; the inner core (3) is made of a conducting material and used as an electrode; a transparent conductive layer (6) coated on the lower cover plate (2) is used as a conductive electrode; an insulating fluid (4) and an ionic liquid (5) are filled in the lens cavity; non-conducting oil (4) with specific parameters and the ionic liquid (5) are combined, thus a varifocal liquid lens system has the functions of a convex lens under the conditions that a voltage is not applied or a low voltage is applied; and the continuation and adjustment of the focal distance of the convex lens are simultaneously realized under the low voltage in the large range from a short focal distance to a far distance.

Description

technical field [0001] The invention relates to a structure of a liquid zoom lens based on an ionic liquid and its working principle, and belongs to the technical field of photoelectric imaging, photoelectric sensing and optical information processing devices. Background technique [0002] Microfluidic optics is a new technology of great significance. It combines modern microfluidic technology and micro-optoelectronics technology to develop a class of optical integrated devices and It has important application prospects in the fields of sensing, communication, and information processing [1]. [0003] Liquid zoom microlens can change the luminous flux and field of view performance of the micro-optical system, and has good manipulation and adaptability. As a replacement for traditional lenses, it can be applied to optical switches and optical interconnects, three-dimensional optical storage, static digital cameras, medical endoscopes , telescopes, and microscopes. The existi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B3/14G02B26/02
Inventor 赵瑞梁忠诚陈陶徐荣青
Owner NANJING UNIV OF POSTS & TELECOMM
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