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Optical element

Foreign code F110004969
File No. RJ008P18WO
Posted date Jul 28, 2011
Country Republic of Korea
Application number 20077004051
Gazette No. 20070033043
Gazette No. 100854183
Date of filing Aug 25, 2005
Gazette Date Mar 23, 2007
Gazette Date Aug 26, 2008
International application number JP2005015464
International publication number WO2006022346
Date of international filing Aug 25, 2005
Date of international publication Mar 2, 2006
Priority data
  • P2004-246860 (Aug 26, 2004) JP
  • P2005-052626 (Feb 28, 2005) JP
Title Optical element
Abstract An optical element wherein the focal length can be remarkably varied through electric control. The optical element comprises a first substrate (111) having a first electrode (21), a second substrate (112), a second electrode (22) arranged on the outside of the second substrate, and a liquid crystal layer (311) wherein liquid crystal molecules stored between the first substrate and the second substrate are oriented unidirectionally. The optical element operates by applying a first voltage (V0) between the first electrode and the second electrode thereby performing orientation control of the liquid crystal molecules. A third electrode (23) is arranged on the outside of the second electrode through an insulation layer and the optical characteristics can be controlled by applying a second voltage (Vc) independent from the first voltage (V0) to the third electrode.
(C) KIPO WIPO 2007
Outline of related art and contending technology BACKGROUND ART
Such as a liquid is has proper flow properties, electrical-optical characteristics of the liquid crystal exhibiting a anisotropy, its molecular orientation state can be controlled in various ways. By using this feature, in recent years are thin and light flat panel type display device is noticeable and the transmission axis of an electric power generation is continued. The alignment state of the liquid crystal molecules, constituting the liquid crystal element 2 is provided on the two sheets of transparent conductive film surface of the glass substrate processing and, external by the applied voltage can be easily controlled. Moreover this kind of a liquid crystal element is by application of a voltage having an effective refractive index that is at least approximately the value for the normal light from the light for the continuously variable up to a value which is said to be possible, other optical material that is not in the pure product having excellent properties.
So far, nematic liquid crystal of the electro-optical effect by using one or more, a typical liquid crystal monitor unlike in the device structure of a parallel plate type, a transparent electrode is part curved glass attached substrate, a liquid crystal layer to be in the form lens by itself, for applying a voltage between the electrodes to the liquid crystal to be controlled to control the orientation of the molecules, which has an effective refractive index can be changed by changing the variable lens is a focal length that has been proposed (shown later in the patent document 1, non Patent literature 1 and 2).
Next, the optical medium in the spatial distribution of a refractive index are given to the lens there is a method to obtain the same effect, cellfork (SELFOC) commercially available as a lens. Nematic in the liquid crystal cell, the liquid crystal molecules are oriented in the direction of the electric field by utilizing the properties, of the type having a pattern of circular holes by using the electrodes, calling the axially of unevenness of the electric field as a is used as the liquid crystal molecule alignment effect, the spatial distribution of a refractive index properties is a method to obtain a liquid crystal lens having A has been reported (patent document 2, patent document 3, patent document 3 and non 4).
Also, in Patent document 4, to the liquid crystal polymer network of a net shape is created by using the and in order to improve the properties of the. Such a liquid crystal lens may also be used, many fine lens having a micro lens which is referred to as a flat plate shape in which a microlens array 2-dimensionally arranged in the width direction is can be relatively facilitated.
In addition, in the liquid crystal micro lens, external to the type of the circular hole of the pattern electrode 1 also a pair of electrodes is positioned by applying a voltage to improve the characteristics of the lens is proposed (non Patent literature 5). In addition, the liquid crystal layer and a circular hole type pattern with an electrode and a method of inserting an insulating layer between the has been proposed (non Patent document 6, 7) and, wherein the properties of the liquid crystal micro lens according to the best that can be obtained from the diameter of the circular hole type pattern and the liquid crystal layer thickness ratio of 2 versus 1 3 versus 1 from needs to be taken as the degree of amelioration of a condition that the same it was found that the device and the semiconductor device.
On the other hand, in the imaging optical system provided with a mechanism for optical system aberration correction obtained from the image pickup device and optical phase was detected, the detected signal from the aberration and compensates for the aberration of the atmosphere is obtained by obtaining the signal due to a variation in an amount of light generated by correcting aberration of the optical system, no distortion to obtain an optical image as an optical device, lens mirror or the like instead of the liquid crystal element is an optical apparatus using has been proposed (patent document 5). In addition, the liquid crystal optical elements can be used as a lens, which has the characteristics of the refractive index distribution of the oval shape, i.e., electric field control type liquid crystal lens is an anamorphic has been proposed (non Patent literature 8).
These utilizing a liquid crystal optical element comprises a, unlike the conventional passive optical element, by applying a voltage between the electrodes of a liquid crystal medium which has an effective refractive index to variably control the, optical characteristics such as focal distance or the optical aberration of the optical system can be adjusted according to a lens which can be realized.
In addition, as a liquid crystal material undergoes a polymerization curing type liquid crystal was used to polymerize and cure after adjusting the focal distance that can be obtained a polymer lens (patent document 6).
Patent document 1: Japanese Patent laid open Hei No. 54-151854
Patent document 2: Japanese Patent laid open Hei No. 11-109303
Patent document 3: Japanese Patent laid open Hei No. 11-109304
Patent document 4: Japanese Patent laid open Hei No. 10-239676
Patent document 5: Japanese Patent laid open Hei No. 03-265819
Patent document 6: Japanese Patent laid open Hei No. 09-005695
Non Patent document 1: SATO Susumu (S. Sato), 'or a focal length variable liquid crystal lens cell (Liquid-crystal lens-cell with variable focal length) ', Japanese Journal of Applied Physics, 1979 years, Vol. 18, P1679 field 1683
Non Patent document 2: SATO Susumu, 'and applications thereof stably', Sangyo Tosho ltd., 14 October 1984, P204 field 206
Non Patent literature 3: key troshiaki nor cell, SATO Susumu (T. Nose and S. Sato), 'using in uneven liquid crystal microlens (Liquid-crystal micro1ens obtained with a non uniform electric field) ', Liquid Crystals, 15 April 1994, P1425 field 1433
Non Patent document 4: SATO Susumu, 'the world of the liquid crystal', Sangyo Tosho ltd., 15 April 1994, P186 field 189
Non Patent literature 5: michinori osaka, nor cell key troshiaki, SATO Susumu (M. Honma, T. Nose and S. Sato), 'stacked electrode structure causes the liquid crystal micro lens increases the numerical aperture of the (Enhancement of numerical aperture of liquid crystal microlenes using a stacked electrode structure) ', Japanese Journal of Applied Physics, August 2000, Vol. 39, No. 8, P4799 field 4802
Non Patent literature 6: example to Xiadong Mao, SATO Susumu (M. Ye and S. Sato), 'of any order liquid crystal optical properties of the lens (Optical properties of liquid crystal lens of any size) ', applied Physics association lecture 49 times a second relationship between the notification home lecture, March 2002, 28p field X field 10, P1277
Non Patent literature 7: xiadong example, SATO Susumu (M. Ye and S. Sato), ' of any order liquid crystal optical properties of the lens (Optical properties of liquid crystal lens of any size) ', Japanese Journal of Applied Physics, 2OO25 month of the year, Vol. 41, No. 5, P. L571-L573
Non Patent literature 8: Yoshitaka Yokoyama, example to Xiadong Mao, SATO Susumu, 'electric field control type anamorphic liquid crystal lens', Japanese liquid crystal Society Lecture preprint of 2004 years in notification house, 26 September 2004
Disclosure of the invention
According to the above, a lens type structure of a liquid crystal layer liquid crystal lens, in the form of a circular hole pattern electrodes that are formed by the etching the axially uniform electric field as a spatial orientation of liquid crystal molecules of the liquid crystal micro lens using distribution characteristics, in addition, non Patent literature 5 which have been proposed for the circular hole type pattern electrode 1 on the outside of the pair of electrodes and the method of placement, 7 and non patent document 6 have been proposed for the liquid crystal layer and the circular hole type pattern to provide an insulating layer between the electrodes in a structure, in a limited voltage range A good optical properties can be obtained. However, a wide applied over a voltage range that good optical characteristics are obtained there was a problem of being difficult.
Scope of claims [claim1]
1. 1 Having a first substrate and the second electrode 1, 2 and the second substrate, wherein the first substrate 2 disposed outside of the first electrode and having apertures 2, 1 and 2 wherein the first substrate being received between the first substrate to orient the liquid crystal molecules and a liquid crystal layer, wherein the first electrodes and the second electrode 1 2 1 between the first voltage is applied to control the alignment of liquid crystal molecules that operate by the optical element,
2 On the outside of the first insulating layer interposed between the electrode and the second electrode is arranged on the 3, 3 to 1 wherein the first electrode is independent of the first voltage 2 and the second voltage is applied to,
Also, 1 based on the first voltage 1 the optical properties of the first step is a predetermined voltage value which best first fixed and the voltage value of 1, 2 wherein the first voltage by varying the optical properties of the step 2 to variably control circuit are provided with
The optical element.

[claim2]
2. 1 Having a first substrate and the second electrode 1, 2 and the second substrate, wherein the first substrate 2 disposed outside of the first electrode and having apertures 2, 1 and 2 wherein the first substrate being received between the first substrate to orient the liquid crystal molecules and a liquid crystal layer, wherein the first electrodes and the second electrode 1 2 1 between the first voltage is applied to control the alignment of liquid crystal molecules that operate by the optical element,
2 On the outside of the first insulating layer interposed between the electrode and the second electrode is arranged on the 3, 3 to 1 wherein the first electrode is independent of the first voltage 2 and the second voltage is applied to,
Also, based on the first voltage 2 1 the optical properties of the first step is a predetermined voltage value which best the first fixed and the voltage value of 2, 1 wherein the first voltage by varying the optical properties of step 2 to variably control circuit are provided with
The optical element.

[claim3]
3. Method according to claim 1 or 2,
2 Said hole having a first electrode is centered on the optical axis direction by and eliminating divided into a plurality of,
The circuit includes, for each of the first electrode divided 2 applying a voltage independent control of the optical element.

[claim4]
4. Method according to claim 1 or 2,
3 the shape of the electrodes of the first sinusoidal wave function or an exponential function or a superposition of sinusoidal wave function of any one of the function applied to the optical element.

[claim5]
5. Method according to claim 1 or 2,
Wherein the liquid crystal layer by the insulating layer 1 layer or a plurality of first liquid crystal layer 2 1 divided respectively of the first liquid crystal layer or the insulating layer of the divided plurality of liquid crystal layer by the optical element.

[claim6]
6. Method according to claim 1 or 2,
The liquid crystal layer is 1 layer or a plurality of divided by the insulating layer and a liquid crystal layer, the liquid crystal layer in each of the orientation of liquid crystal molecules disposed so as to be parallel or perpendicular to the optical element.

[claim7]
7. Method according to claim 1 or 2,
A liquid crystal material of the liquid crystal layer, in the low driving signal acts as a P type, high frequency type N drive signal is operating as a frequency in the 2 driving type liquid crystal material is used and that the optical element.

[claim8]
8. 1 the inner surface having a first substrate and the second electrode 1,
1 the inner surface of the substrate opposite the first substrate 2,
2 Disposed outside of the first substrate having a first electrode and the hole 2,
2 the first substrate and the first substrate 1 being received between the liquid crystal layer 1 made of a first liquid crystal molecules,
2 the first electrode with respect to the insulating portion 3 between the first electrode is disposed,
2 the first electrodes and the second electrode and between the 3, 2 are disposed symmetrically to the first substrate and second substrate 3,
Wherein the first and the second electrode and the second electrode 2 3 3 and the second substrate 1 is placed between the first and second substrate and the liquid crystal layer 1 disposed symmetrically 2 4 the first and second liquid crystal layer having a first substrate and the electrode 4,
Wherein the first electrode and the second electrode 1 2, 4 2 and the second electrodes and the second electrode 1 is applied to between the first voltage, independent of the first voltage 1 2 3 first voltage means for applying a first electrode
Characterized by being provided with an optical element.

[claim9]
9. Method according to claim 8,
1 the liquid crystal layer by the insulating layer 2 each of the first divided liquid crystal layer and,
1 3 First liquid crystal layer 4 and the first and second liquid crystal layer,
2 the first liquid crystal layer is a layer including a first and second liquid crystal 5 6
The optical element.

[claim10]
10. Method according to claim 8,
3 the electrode of the first electrode is within the hole 2 is arranged at a distance to the optical element.

[claim11]
11. 1 Having a first substrate and the second electrode 1, 2 and the second substrate, wherein the first substrate 2 disposed outside of the first electrode and having apertures 2, 1 and 2 wherein the first substrate being received between the first substrate to orient the liquid crystal molecules and a liquid crystal layer, wherein the first electrodes and the second electrode 1 2 1 between the first voltage is applied to control the alignment of liquid crystal molecules that operate by the optical element,
2 On the outside of the first insulating layer interposed between the electrode and the second electrode is arranged on the 3, 3 to 1 wherein the first electrode is independent of the first voltage is configured to apply a first voltage and 2, wherein the first voltage value 1 in the state, wherein the first voltage 2 is variable optical properties by the control circuit varies as a convex lens,
2 the voltage value of the first fixed voltage, said second voltage by 1 varying optical properties as a concave lens to variably control circuit
Optical elements with a.

[claim12]
12. 1 Having a first substrate and the second electrode 1, 2 and the second substrate, wherein the first substrate 2 disposed outside of the first electrode and having apertures 2, 1 and 2 wherein the first substrate being received between the first substrate to orient the liquid crystal molecules and a liquid crystal layer, wherein the first electrodes and the second electrode 1 2 1 between the first voltage is applied to control the alignment of liquid crystal molecules that operate by the optical element,
2 On the outside of the first electrode and the second electrode sandwiching the insulating layer 3 is disposed, the first electrode 1 3 is independent of the first voltage 2 and the second voltage is applied to, based on the first voltage 1 1 the optical properties of the first step is a predetermined voltage value which best the first voltage value 1 being fixed, wherein the first voltage 2 is variable by a first step 2 to variably control the optical properties of the circuit,
2 Based on the first voltage 3 the optical properties of the first step is a predetermined voltage value which best the first fixed and the voltage value of 2, 1 wherein the first voltage by varying the optical properties of step 4 to variably control circuit,
Wherein the first and the second switch circuit for switching a 2 1
Optical elements with a.
  • Applicant
  • AKITA CENTER TO IMPLEMENT VIGOROUS ENTERPRISES
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
  • Inventor
  • SATO Susumu
  • YE MAO
IPC(International Patent Classification)
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