TWI490595B - Optical system for rotating liquid crystal to adjust lens focal length - Google Patents

Description

Optical system for adjusting the focal length of the lens by liquid crystal steering

The invention relates to an optical system for adjusting the focal length of a lens by liquid crystal steering, in particular to changing the rotation angle of liquid crystal molecules by using different electric field changes, so as to change the angle of refraction of the light source after entering the liquid crystal layer, thereby being able to rely on the wearer's view. Appropriate focal length adjustment according to your needs, you can get more comfortable and clear visual correction effect.

According to the principle of human vision, the image is projected into the retina by the refraction of light, and the function of the image is observed. As the eye ages, the crystal will gradually harden, making the ability of the crystal to adjust the shape gradually lost. Focusing on the retina, commonly known as hyperopia; and the opposite of hyperopia is myopia, because the curvature of the cornea in front of the eye is too large, causing light to be focused in front of the retina through the eyeball, unable to see distant objects, currently A lens with fixed focusing performance is widely used as a visor and a contact lens to correct the above-mentioned myopia or hyperopia. The wearer has clear vision; while the contact lens has better corrective effect and is more beautiful because it is directly covered on the eyeball, but it is quite troublesome to wear and has the limitation of wearing time and cleaning. It is possible to be slightly careless. The damage caused by eyeballs is that the market share is low, and the average person still uses tangible glasses as the main choice for vision correction.

The general glasses disclosed at present are formed by nesting two lenses in a single frame. However, the type of glasses adopts a structural design of a fixed number of lenses, and has only a single focal length, and cannot adjust the focal length with the eyes of the wearer. For far-sighted people, it is necessary to use two types of focal length lenses to achieve the long-term and close-to-see needs. This is not only a waste of money, but also the need to carry multiple glasses at a time, which is extremely inconvenient to use and has its shortcomings; therefore, in order to make the lens have More focus changes have been invented by the industry to make the bifocal glasses, so that the far-sighted person can wear a pair of glasses to focus on both the distance and the near, and also discloses a new type of announcement in Japanese Laid-Open Patent Publication No. 63-122321. The spectacle frame of the bifocal lens enables the view of the two focal lengths of the lens to be moved to the most comfortable position when using near-sight or far-sight; however, the above-mentioned double-focus glasses can simultaneously provide near vision and long-distance vision. However, it still belongs to a fixed single focal length. For users who need to support viewing with multiple focal lengths, it still cannot meet their needs. Moreover, general glasses Matching, the size of the frame and the eye distance of the wearer are usually used as the reference for adjusting the focal length of the lens to obtain the best visual focus when wearing, but the wearer's near (far) degree of vision will gradually increase with age. Or the amount of eye time is slightly increased or reduced, causing the glasses to lose the accuracy of the original fitting focal length, resulting in visual discomfort of the wearer.

Nowadays, the inventor is in view of the fact that the above-mentioned existing adjustable focal length glasses still have multiple defects in practical implementation, so it is a tireless spirit, and with its rich professional knowledge and years of practical experience, Improvements have been made and the present invention has been developed based on this.

The main object of the present invention is to provide a method for changing the rotation angle of liquid crystal molecules by using different electric field changes, so as to change the angle of refraction of the light source after entering the liquid crystal layer, so that the appropriate focal length adjustment can be performed according to the wearer's viewing requirements, and the Comfortable and clear visual correction effect.

In order to achieve the above-mentioned object, the inventors propose an optical system for adjusting the focal length of a lens by liquid crystal steering, in which a liquid crystal layer is disposed in the lens, and the lens has a thickness to provide an optical transmission distance, and has a first surface and corresponding thereto. a second surface, wherein a conductive layer is respectively disposed between the liquid crystal layer and the first surface and the second surface of the lens, and the conductive layer is respectively provided with a plurality of driving units, each driving unit is electrically connected to a voltage controller, so that the voltage controller A specific driving voltage can be respectively output to each driving unit, and the driving voltage is distributed symmetrically toward both ends with the longitudinal central axis of the conductive layer; thereby, the voltage controller can output different driving voltage combinations to change the liquid crystal molecules. Rotation angle, using liquid crystal molecules with different refractive indexes at different corners, so that the refraction angle of the light source after entering the liquid crystal layer is further changed to achieve the effect of adjusting the required visual focal length; further, different focal lengths can be made on the same pair of glasses. The adjustment not only allows the user to follow the individual's location, viewing preferences, the depth of myopia and He directly adjust the degree of environmental factors, without at the same time fitting two pairs to look too far to see different glasses near, and when the wearer recognized When the degree is slightly increased or reduced, it can be appropriately adjusted to meet the demand, so that it is not necessary to separately fit new glasses, so that the present invention can balance economic benefits and convenience in addition to practical value.

In an embodiment of the invention, the lens may be one of a planar lens or a curved lens, and the material thereof may be one of a translucent glass or a translucent plastic.

In an embodiment of the invention, the conductive layer is a transparent conductive layer, and the transparent conductive layer may be one of indium tin oxide (ITO), indium zinc oxide (IZO) or tin oxide.

In an embodiment of the invention, the liquid crystal layer has a plurality of liquid crystal molecules, and the liquid crystal molecules may be selected from the group consisting of nematic, cholesteric, electroactive polymers, polymer liquid crystals, polymer dispersed liquid crystals, and polymer stabilized liquid crystals. Group of.

In an embodiment of the invention, the voltage controller can respectively output a positive driving voltage to a driving unit of a conductive layer, and output a negative driving voltage to a driving unit of another conductive layer; wherein the positive driving voltage is between 0 volts and It is between positive 3 volts and the negative drive voltage is between 0 volts and minus 3 volts.

(1) ‧ ‧ lens

(11) ‧‧‧ first surface

(12) ‧‧‧second surface

(2) ‧‧‧Liquid layer

(21) ‧‧‧liquid crystal molecules

(3) ‧‧‧ Conductive layer

(31)‧‧‧ drive unit

(4) ‧‧‧voltage controller

First: a schematic diagram of an optical system for outputting a specific driving voltage to a driving unit by a voltage controller according to a preferred embodiment of the present invention

Second: Schematic diagram of liquid crystal molecules in a driving unit of a preferred embodiment of the present invention at zero driving voltage

Third: Schematic diagram of liquid crystal molecules in a driving unit of a preferred embodiment of the present invention at a moderate driving voltage

Fourth: Schematic diagram of liquid crystal molecules in a driving unit of a preferred embodiment of the present invention at a high driving voltage

The object of the present invention and its structural and functional advantages will be explained in conjunction with the specific embodiments according to the structure shown in the following drawings, so that the reviewing committee can have a more in-depth and specific understanding of the present invention.

First, please refer to the first figure, which is a schematic diagram of an optical system for outputting a specific driving voltage to a driving unit of a voltage controller according to a preferred embodiment of the present invention. The optical system of the liquid crystal steering adjustment lens focal length is set in the lens (1). a liquid crystal layer (2) having a thickness to provide an optical transmission distance and having a first surface (11) and a second surface (12) corresponding thereto, wherein the liquid crystal layer (2) and the lens ( 1) A conductive layer (3) is respectively disposed between the first and second surfaces (11) and (12), and the conductive layer (3) is respectively provided with a plurality of driving units (31), and each driving unit (31) is electrically connected To a voltage controller (4), the voltage controller (4) can respectively output a specific driving voltage to each driving unit (31), and the driving voltage is centered on the longitudinal central axis of the conductive layer (3) It is distributed symmetrically.

Furthermore, the conductive layer (3) may be a transparent conductive layer (3) made of indium tin oxide (ITO), indium zinc oxide (IZO) or tin oxide, and the liquid crystal layer (2) has a plurality of Liquid crystal molecules (21), and liquid crystal molecules (21) It may be selected from the group consisting of a nematic type, a cholesterol type, an electroactive polymer, a polymer liquid crystal, a polymer dispersed liquid crystal, and a polymer-stabilized liquid crystal.

It should be noted that the lens (1) of the present invention may be one of a planar lens or a curved lens, and the material thereof may be one of a translucent glass (for example, quartz, crystal, etc.) or a translucent plastic. By controlling different rotation angles of the liquid crystal molecules (21) to produce different refractive indices, thereby producing a focusing or diverging effect like a convex lens (1) or a concave lens (1); see the second figure, which is a comparison of the present invention. A schematic diagram of the state of the liquid crystal molecules at a zero driving voltage of the driving unit of the preferred embodiment. Since the dielectric constants of the liquid crystal molecules (21) in different directions are different, an applied electric field can change the arrangement angle of the liquid crystal molecules (21), and the liquid crystal molecules (21) ) having different refractive indices at different angles; for example, as shown in the second figure, when the voltage controller (4) does not output the driving voltage, the liquid crystal molecules (21) are not rotated, and the voltage controller (4) The liquid crystal molecule (21) produces about 45 degrees of rotation (as shown in the third figure) at a moderate driving voltage, and the liquid crystal molecule (21) produces about 90 when the voltage controller (4) outputs a high driving voltage. Degree of rotation (as shown in the fourth figure), by Liquid crystalline molecules (21) such that the rotation angle of light entering the liquid crystal layer, the angle of refraction (2) after a corresponding change to achieve the purpose of the focal length can be adjusted video.

According to the above preferred embodiment, the optical system for adjusting the focal length of the liquid crystal steering lens is used in practice, please refer to the first figure, the voltage controller (4). The driving unit (31) of the positive driving voltage to a conductive layer (3) may be respectively output, and the driving voltage (31) of the negative driving voltage to the other conductive layer (3) is output, and the positive driving voltage is between 0 volts and Between positive 3 volts, in the present embodiment, the longitudinal center axis of the conductive layer (3) is symmetrically distributed toward both ends, meaning that the driving voltage of the longitudinal central axis of the conductive layer (3) is 0 volts. The second end is +1 volt, +2 volt, and +3 volt, respectively; and the negative driving voltage received by the driving unit (31) of the other conductive layer (3) is also centered on the longitudinal central axis. Symmetrical distribution, that is, the driving voltage of the longitudinal central axis of the conductive layer (3) is 0 volts, and the two ends are respectively -1 volt, -2 volt, and -3 volts; thereby, in the liquid crystal layer (2) The liquid crystal molecules (21) generate corresponding rotation angles according to different driving voltages, and exhibit upper and lower symmetry. Since the liquid crystal molecules (21) have different refractive indexes at different rotation angles, the light source enters the liquid crystal layer (2). Produces a refractive angle such as a convex lens (1) to achieve the effect of adjusting the visual focus of the far-sighted person, and can be utilized The same driving voltage is combined to generate different liquid crystal molecules (21) rotation angles to achieve the effect of adjusting the required visual focal length; and it is worth noting that although the specific embodiment is based on the driving layer (31) of the conductive layer (3), respectively The driving voltages of +1 to +3 volts and -1 to -3 volts are used as examples, but the values of the driving voltage are not limited. According to the spirit of the present invention, various variations or modifications may be made, such as a conductive layer (3). The driving unit (31) is +7, +5, +3, +1, +3, +5, +7 or -7, -5, -3, -1 in order from top to bottom. , -3, -5, -7, or the polarity of the positive and negative driving voltages are exchanged, etc.; therefore, it can be obviously replaced and repaired by those skilled in the art after reading and understanding the invention. Decorations will still be incorporated within the scope of the claimed invention.

From the above optical system for adjusting the focal length of the liquid crystal by adjusting the lens, and the description of the implementation, the present invention has the following advantages:

1. The optical system of the liquid crystal steering adjustment lens focal length changes the rotation angle of the liquid crystal molecules by the voltage controller outputting different driving voltage combinations, and the liquid crystal molecules have different refractive indexes at different rotation angles, thereby causing the light source to enter the liquid crystal layer. The post-refraction angle is then changed to achieve the effect of adjusting the desired visual focus.

2. The invention utilizes the driving voltage outputted by the voltage controller to achieve the effect of adjusting the visual focal length, so that the same focal length can be adjusted on the same eyeglass, so that the user can follow the personal location, viewing preferences, and myopia. The depth and other environmental factors directly adjust the degree, without the need to simultaneously match two different glasses that look far and close, in addition to practical value, can better balance economic benefits and convenience.

3. The present invention, by virtue of its functional characteristics of the adjustable focal length change degree, enables the wearer to adjust the amount to meet the demand when the degree is slightly increased or reduced, so that it is not necessary to separately complicate the new glasses.

In summary, the optical system of the present invention for adjusting the focal length of the lens by liquid crystal can indeed achieve the intended use efficiency by the above disclosed embodiments, and the present invention has not been disclosed before the application, and has completely complied with the patent. The rules and requirements of the law.爰Issuing an application for a patent for invention in accordance with the law, and asking for a review, and granting a patent, is truly sensible.

However, the illustrations and descriptions disclosed above are only preferred embodiments of the present invention, The scope of the present invention is defined by the scope of the invention, and other equivalents and modifications of the invention are intended to be within the scope of the invention.

(1) ‧ ‧ lens

(11) ‧‧‧ first surface

(12) ‧‧‧second surface

(2) ‧‧‧Liquid layer

(21) ‧‧‧liquid crystal molecules

(3) ‧‧‧ Conductive layer

(31)‧‧‧ drive unit

(4) ‧‧‧voltage controller

Claims (10)

An optical system for adjusting the focal length of a lens by liquid crystal steering, wherein a liquid crystal layer is disposed in the lens, the lens has a thickness to provide an optical transmission distance, and has a first surface and a second surface corresponding thereto, and the liquid crystal layer A conductive layer is disposed between the first surface and the second surface of the lens, and the conductive layer is respectively provided with a plurality of driving units electrically connected to a voltage controller, and the voltage controller outputs different driving voltages to different The driving unit is configured such that the driving voltages are symmetrically distributed toward both ends centering on a longitudinal central axis of the conductive layer. An optical system for adjusting the focal length of a liquid crystal steering lens according to the first aspect of the patent application, wherein the lens is one of a planar lens or a curved lens. The optical system for adjusting the focal length of the liquid crystal by adjusting the lens according to the first aspect of the patent application, wherein the lens is made of a translucent glass. The optical system for adjusting the focal length of the liquid crystal by adjusting the lens according to the first aspect of the patent application, wherein the lens is made of a translucent plastic. The optical system of the liquid crystal steering adjustment lens focal length as described in claim 1 wherein the conductive layer is a transparent conductive layer. An optical system for adjusting the focal length of a liquid crystal by adjusting the lens as described in claim 5, wherein the conductive layer is one of indium tin oxide (ITO), indium zinc oxide (IZO) or tin oxide. An optical system for adjusting the focal length of a liquid crystal steering lens according to claim 1, wherein the liquid crystal layer has a plurality of liquid crystal molecules selected from the group consisting of nematic, cholesteric, electroactive polymers, and polymers. A group consisting of a liquid crystal, a polymer dispersed liquid crystal, and a polymer-stabilized liquid crystal. An optical system for adjusting the focal length of a liquid crystal steering lens according to the first aspect of the patent application, wherein the voltage controller outputs a positive driving voltage to a driving unit of a conductive layer, and outputs a driving voltage of the negative driving voltage to another conductive layer. unit. An optical system for adjusting the focal length of a liquid crystal by a liquid crystal steering as described in claim 8 wherein the positive driving voltage is between 0 volts and plus 3 volts. An optical system for adjusting the focal length of a liquid crystal by adjusting the lens as described in claim 8 wherein the negative driving voltage is between 0 volts and minus 3 volts.