CN111897122A

CN111897122A - Lightweight zoom telescopic glasses

Info

Publication number: CN111897122A
Application number: CN202010742969.1A
Authority: CN
Inventors: 李磊; 陈雅妮; 薛健
Original assignee: Sichuan University
Current assignee: Sichuan University
Priority date: 2020-07-29
Filing date: 2020-07-29
Publication date: 2020-11-06
Anticipated expiration: 2040-07-29
Also published as: CN111897122B

Abstract

The invention discloses a light-weight zoom telescopic glasses, comprising: the device comprises a drive control device, a driver, an objective lens incidence surface circular reflecting film, an objective lens emergence surface annular reflecting film, an eyepiece lens incidence surface annular reflecting film, an eyepiece lens emergence surface circular reflecting film, a zoom surface I, a zoom surface II, a zoom surface III, a zoom surface IV, a medium I and a medium II; the technical key points of the invention are as follows: the curvature of a zooming surface used by the system can be changed when the driving device works, so that high-resolution imaging of a remote object can be realized, and tiny details of the object can be quickly identified through continuous zooming; the invention adopts a catadioptric hybrid structure, the zoom surface is plated with the reflecting film, when light rays are incident on the lens, the reflecting film on the zoom surface of the lens enables the light path to be reflected for multiple times in the lens, the radial size of the telescope is reduced, compared with the traditional telescope, the system is more compact and lighter, and the vacancy of the zoom glasses in the aspect of telescope is filled.

Description

Lightweight zoom telescopic glasses

Technical Field

The present invention relates to telescopic glasses, and more particularly, to lightweight variable-focus telescopic glasses.

Background

The telescope is an indispensable tool for long-distance astronomical or ground observation, and has been widely used in aspects of military operation, astronomical observation, field exploration, security and police, navigation and patrol and the like after 400 years of development. With the advance of science and technology, the demand of people for telescopes is not limited to look wider and look farther. How to develop a zoom telescope with a larger zoom ratio, a shorter rear working distance and lighter weight becomes the focus of people's attention. In recent years, with the rise of technologies such as AR, a new demand has arisen for making telescopes lightweight head-mounted products, and the emergence of adaptive lenses having an auto-zoom function has provided a new idea for lightweight optical zooming.

The traditional zoom telescope mainly adopts an optical compensation mode to carry out zoom design, only one of an objective lens, a steering system or an eyepiece is continuously zoomed to realize zooming of the system, the zooming ratio is limited, the zooming structure is relatively complex, and the weight is not light enough.

Disclosure of Invention

The invention aims to provide light-weight continuous optical zooming telescopic glasses with large zoom ratio, which can be applied to head-mounted equipment.

The invention provides lightweight zoom telescopic glasses, as shown in the attached figure 1, comprising: the device comprises a drive control device, a driver, an objective lens incidence surface circular reflecting film, an objective lens emergent surface annular reflecting film, an eyepiece lens incidence surface annular reflecting film, an eyepiece lens emergent surface circular reflecting film, a zoom surface I, a zoom surface II, a zoom surface III, a zoom surface IV, a medium I and a medium II.

The working principle of the lightweight zoom telescopic glasses provided by the invention is shown in figure 2, and the system adopts a refraction and reflection type optical path structure which combines refraction and reflection to compress an optical path to the maximum extent. The light firstly enters an incidence surface (a zooming surface I) of an objective lens and enters a medium I after being refracted; when the light reaches the emergent surface (zoom surface II) of the objective lens, the light path is folded back because the emergent surface of the objective lens is reflected by the reflecting film, and the light returns to the medium I again; when the light reaches the incident surface again, the light is reflected by the circular reflecting film of the incident surface of the objective lens and is reflected again, leaves from the central area of the emergent surface of the objective lens and enters the medium II, and is focused on the optical axis to form a real image; the light ray of the real image pointProceeding on-axis to the entrance face of the eyepiece (zoom plane iii), refracting into medium i. When the light reaches the emergent surface (zoom surface IV) of the ocular, the light is reflected by the round reflecting film of the emergent surface of the ocular, returns to the medium I and is reflected by the annular reflecting film of the incident surface of the ocular, and leaves from the upper part and the lower part of the emergent surface of the ocular to form parallel light. Finally, the light rays enter the human eye and are focused by the human crystalline lens to form a magnified image on the retina. When the telescopic magnification is required to be changed, the driving control device sends out instructions to change the curvature radiuses of the zoom plane I, the zoom plane II, the zoom plane III and the zoom plane IV through the drivers, as shown in the attached drawing 3. The telescope system becomes Galileo formula structure by Kepler formula structure, and the focus of lens also changes thereupon, and incident parallel light passes through the real image that the refraction of the two side zoom planes of objective and secondary reflection formed and falls on the image space focus of eyepiece, and this is a virtual image to the eyepiece, and this virtual image passes through the refraction of eyepiece and secondary reflection finally leaves with parallel light, forms the image of enlargeing on people's eye retina, and the magnification of system has also changed this moment, realizes zooming function. In the whole light ray tracing process, the focal length of the objective lens of the zoom telescope system

Ocular focal length

And magnification

This can be given by the following formula:

wherein the content of the first and second substances,

is the refractive index of the medium I and,

is the refractive index of medium II,

is the thickness of the objective lens,

the thickness of the ocular lens is taken as the thickness of the ocular lens,

、

the curvatures of the zoom planes I, II, III and IV are sequentially shown. Because the reflecting film on the lens zooming surface enables the light path to be reflected for multiple times in the lens, the light path is shortened, the radial size of the telescope is reduced, and compared with the traditional telescope, the system is more compact.

Preferably, medium I is generally a flexible solid or liquid and medium II may be a gas or liquid.

Preferably, the objective lens and the eyepiece are driven together and the driving mode is piezoelectric ceramic driving, electromagnetic driving or stepping motor driving.

Preferably, the times N of folding the optical path in the objective lens or the ocular lens is more than or equal to 2, and N is less than or equal to 10.

Preferably, when the curvature of the lens is changed, the focal length of the objective lens is larger than that of the eyepiece lens, and two telescopic system structures of a Keplerian type and a Galileo type can be realized.

Preferably, the reflective film material is silver or aluminum.

Preferably, the caliber D of the lightweight zoom telescopic glasses is more than or equal to 15 and less than or equal to 50.

Drawings

Fig. 1 is a schematic structural view of lightweight variable-focus telescopic glasses according to the present invention.

FIG. 2 is a Kepler mode diagram of a lightweight variable-focus telescopic glasses according to the present invention.

FIG. 3 is a Galileo mode diagram of the lightweight variable-focus telescopic glasses according to the present invention.

Fig. 4 is a schematic diagram illustrating a relationship between a focal length and a voltage of the catadioptric adaptive lens in the embodiment.

The reference numbers in the figures are:

the device comprises a drive control device 1, a driver 2, a lens incidence surface circular reflecting film 3, a lens emergence surface girdle reflecting film 4, an eyepiece incidence surface girdle reflecting film 5, an eyepiece emergence surface circular reflecting film 6, a zoom surface I7, a zoom surface II 8, a zoom surface III 9, a zoom surface IV 10, a medium I11, a medium II 12, a human eye 13, a crystalline lens 14 and a retina 15.

Detailed Description

The present invention will be further described below by describing in detail an embodiment of lightweight variable-focus telescopic glasses proposed by the present invention. It should be noted that the following examples are only for illustrative purposes and should not be construed as limiting the scope of the present invention, and that the skilled person in the art may make modifications and adaptations of the present invention without departing from the scope of the present invention.

One embodiment of the invention is:

as shown in fig. 1, the lightweight zoom telescopic glasses include, in order from an object side to an image side: the device comprises a drive control device, a driver, an objective lens incidence surface circular reflecting film, an objective lens emergent surface annular reflecting film, an eyepiece lens incidence surface annular reflecting film, an eyepiece lens emergent surface circular reflecting film, a zoom surface I, a zoom surface II, a zoom surface III, a zoom surface IV, a medium I and a medium II.

As shown in fig. 2, the lightweight variable-focus telescopic glasses use a catadioptric hybrid system structure, and perform secondary reflection by using a lens focusing and re-reflecting mirror, and then focus the light through a human crystalline lens to form an image on a retina.

The folding type self-adaptive lens adopts a PDMS elastic membrane driven by voltage electroceramic, the membrane thickness is 500 mu m, and the aperture of the lens is 35 mm. The reflecting film is a silver film, and the reflectivity of the reflecting film is 92 percent. The outer surface of the incident panel was coated with a silver coating, and the area coated with the silver coating was a circular area with a diameter of 15 mm. The area of the silver-plated film of the emergent panel is an annular belt, the outer diameter of the annular belt is 35mm, and the inner diameter of the annular belt is 25 mm. Specific parameters of the lens body portion: the outer diameter of the lens outer frame is 39mm, and the thickness is 2 mm; medium I is NaCl solution with refractive index of 1.38, Abbe number of 55.8, and medium II is air.

The working band adopted by the embodiment is 456nm-656 nm. The driver adopts piezoelectric ceramics. When voltage is applied to the invention, the curvatures of the two sides of the lens are changed along with the change of the focal length, thereby realizing the effect of continuous zooming. When the voltage is changed from 0V to 60V, the focal length of the lens is changed as shown in fig. 4. It should be noted that the driving voltage of the lens in the embodiment of the present invention is about 30V, so that the focal length is not changed when the driving voltage is about 0V to about 30V.

Claims

1. A lightweight variable-focus telescopic glasses comprising: the zoom surface I, II, III and IV of the system can change the curvature when the driving device works, the system adopts a catadioptric hybrid structure, and the zoom surfaces I, II, III and IV are respectively plated with the objective incident surface circular reflecting film, the objective emergent surface girdle reflecting film, the eyepiece incident surface girdle reflecting film and the eyepiece emergent surface circular reflecting film.

2. The lightweight variable focus telescopic glasses according to claim 1, wherein medium i is a generally flexible solid or liquid, and medium ii is a gas or liquid.

3. The lightweight variable-focus telescopic glasses according to claim 1, wherein the driving mode is piezo ceramic driving, electromagnetic driving, or stepping motor driving.

4. The lightweight variable-focus telescopic glasses according to claim 1, wherein the objective lens focal length is larger than the eyepiece lens focal length and two telescopic system structures of Keplerian and Galileo can be realized when the curvature of the lens is changed.

5. The lightweight variable-focus telescopic glasses according to claim 1, wherein the number of times N that the optical path is folded in the objective lens or the eyepiece is 2 or more, and N is 10 or less.

6. The lightweight variable-focus telescopic glasses according to claim 1, wherein the reflective film material is silver or aluminum.

7. The lightweight variable-focus telescopic glasses according to claim 1, wherein a diameter D of the lightweight variable-focus telescopic glasses is not less than 15 and not more than 50.