JPH02213816A - Noctovision - Google Patents

Abstract

PURPOSE:To eliminate an image slanting phenomenon due to the difference between the reproduced image slanting directions of a right and left optical system and to prevent an image from being distorted by nearly paralleling the reproduced image tilt angles of the right and left optical systems by comparing the observation result of a standard pattern. CONSTITUTION:The standard pattern 30 which has a standard erect pattern for measurement, the noctovision 32 which shifts right and left to confront the standard pattern 30 and has the optical axis 31 aligned to obtain its erect reproduced image, and a measurement optical system 33 with a measurement marker display measures the tilt angle of the reproduced image of the noctovision 32 are provided. The inclination of due to the image tilting of the right and left optical systems are made as parallel to each other as possible, namely, image tubes which are equal in the image tilt angle within a possible range are combined to form a binocular type device. Consequently, the difference in image tilt angle between the right and left optical systems is reduced to prevent the image from being distorted.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a night vision device, and in particular, an inverted reproduced image that is input through an objective system and reproduced is inverted through an optical fiber and converted into an erect image using an eyepiece optical system. The present invention relates to a binocular type night vision device having an image tube provided to a system.

[Conventional technology]

BACKGROUND ART A binocular-type night vision device consisting of two series of eyepiece optical systems, an image tube, and an eyepiece optical system arranged in parallel at intervals corresponding to the interpupillary distance is well known.

Recently, some night vision devices have been designed to be miniaturized and utilize optical fibers instead of the conventional electronic method to erect an inverted reproduced image on an image tube.

This optical fiber uses, for example, an optical fiber having a fiber configuration provided corresponding to each unit screen of an inverted reconstructed image of an observation target reproduced by an image tube, and the refractive index of each fiber is adjusted so that the input and output light is 180. By setting the image to be inverted, an erect reconstructed image can be obtained using the output light.
This significantly shortens the distance between the image tube's light-receiving photocathode and the output phosphor screen, making the night vision device significantly more compact.

In such a night vision device, the inversion angle of the optical fiber used to invert the inverted reconstructed image to an upright position is ideally 180
It is desirable that it is within the range of degrees, but there is a tolerance for this
For example, an error within ±2° is allowed.

FIG. 3 is a side view showing the configuration of one system of a conventional night vision device, showing the objective optical system 1. The night vision optical system, which is composed of an image tube 2 and an eyepiece optical system 3, is arranged in parallel to correspond to the interpupillary distance. The image is amplified ten thousand times and obtained as a bright erect reconstructed image on the phosphor screen 5, which is viewed with binoculars.

[Problem to be solved by the invention]

The conventional binocular night vision device described above has a unique unevenness distortion that cannot be seen in monocular night vision devices, that is, even when flat terrain is observed, it may appear raised or depressed. The disadvantage is that the phenomenon of visible images often occurs.

This phenomenon is based on a slight image tilt phenomenon that is not recognized in the case of a monocular configuration, and when a vertical line pattern is visually recognized, as shown in FIG. This is due to the slight inclination to the image 7, and in the case of binoculars, this image inclination is a combination of left and right image inclinations, and depending on the magnitude of the difference in the inclination angle, the above-mentioned bulge or This produces a unique uneven distortion that is felt as a dent.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and to provide a night vision device that does not cause unevenness distortion for flat objects to be observed.

[Means to solve the problem]

The apparatus of the present invention is a binocular-type dark machine in which an input inverted reconstructed image received through an objective optical system is reproduced by an optical fiber as an erect reconstructed image inverted by 180 degrees.The output of an image tube is observed through an eyepiece optical system. In the optical system, the reproduced image inclination angles of the left and right optical systems, which occur based on the reversal tolerance in the 180-degree reversal operation of the image tube, are set to be almost parallel by comparing the observation results of the standard pattern. The image forming apparatus is configured to include means for eliminating an image collapse phenomenon caused by a difference in the direction of inclination of the reproduced image of the optical system.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a configuration diagram of an embodiment of the present invention, in which a standard pattern 30 displaying a standard upright pattern for measurement,
Shift left and right with respect to this standard pattern 30 and face it directly,
A night vision device 3 that aligns three optical axes to obtain an erect reconstructed image.
2, and a measurement optical system 33 with a measurement target display that measures the inclination angle of the reproduced image of the night vision device 32.

Before explaining the operation of this embodiment, the principle of the present invention will first be explained. The above-mentioned image tilt depends on the manufacturing process of the image tube, and it is difficult to avoid a distribution within the range of about ±2 degrees based on the current state of the art, and this is regarded as an allowable error.

Against this background, the present invention is characterized in that distortion is prevented by reducing the difference in inclination angle of image inclination between the left and right optical systems in order to reduce the shortcomings mentioned above.

In other words, by making the tilt angles of the left and right optical systems as parallel as possible, or in other words, by combining image tubes with the same image tilt angle within the possible range to create a binocular device. , the above-mentioned distortion is intended to be reduced, and the method is as follows.

FIG. 2 is an explanatory diagram showing a reconstructed image obtained by the measurement optical system of the embodiment shown in FIG. A standard pattern 30 is attached to the left eye fluorescent screen 10 and the right eye fluorescent screen 20 of the binocular type night vision device 32.
The image inclination angle of the left-eye reconstructed image 11 and the right-eye reconstructed image 12 when capturing a vertical line pattern of θ1. θ2,
The resulting difference in inclination angle between both eyes is θo-jθ1-θ2
Set to 1.

In conventional night vision devices, θ1. θ2 is distributed within a range of ±2 degrees, and as a result, θ. will be distributed between 0 and 4 degrees. The characteristic unevenness distortion when night visioning a flat observation target such as horizontal terrain depends on this θ0, and θ. 〉2 degrees is particularly noticeable.

Select the combination of left and right image tubes according to the measurement system of the first country, and set θ. It can be reduced by keeping it ≦2 degrees.
θ. At 505 degrees, it is almost completely prevented.

〔Effect of the invention〕

As explained above, the present invention significantly reduces unevenness distortion on a flat observation object by selecting and combining image inclinations of the two left and right optical systems in a binocular night vision device by measurement to make them almost parallel. It has the effect of suppressing it.

...Ideal reconstructed image, ]0... Fluorescent screen for left eye, 20. Fluorescent screen for right eye, 11... Left eye reconstructed image, 12. Right eye reconstructed image, 30... Standard pattern 231. - Optical axis, 32 - Night vision device, 33... Measurement light receiving system.

Claims (1)

[Scope of Claims] A binocular type system for observing the output of an image tube through an eyepiece optical system, which reproduces an input inverted reconstructed image received through an objective optical system as an erect reconstructed image inverted by 180 degrees using an optical fiber. In the night vision device, the reproduced image inclination angles of the left and right optical systems, which are generated based on the reversal tolerance in the 180-degree reversal operation of the image tube, are set to be almost parallel by comparing the observation results of the standard pattern. A night vision device comprising means for eliminating an image collapse phenomenon caused by a difference in the direction of inclination of a reproduced image of an optical system.