KR101666678B1 - Apparatus and method for observing by using proximity sensor - Google Patents

Abstract

An observation apparatus using a proximity sensor and a method thereof are provided. Based on the signal from the proximity sensor, it detects the access state of the measurement object to the observation device, and acquires the current time information and the position information. The intensity of light emitted from the proximity sensor or the intensity of light of the display unit of the observation apparatus is adjusted based on at least one of the access state to the observation apparatus, the current time information, and the position information.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an observing apparatus using a proximity sensor,

The present invention relates to an observation apparatus, and more particularly, to an observation apparatus using a proximity sensor and a method thereof.

In general, observation equipment is a device that can observe and scout long distances in day / night. Such an observation device (or an observation device) is basically composed of a combination of a daytime optical device and a mechanical device.

In recent years, it is possible to observe and reconnaissance at night, and it is possible to acquire the position information of the observer and measure the distance from the observer to the observation object by variously constituting the daytime optical system external thermo optical system, global positioning system (GPS) The development of observational equipment is underway.

Observation equipment is used during day and night. Conventionally, when the user is not operating the observation equipment, the power supply to the display is directly cut off, and the power is only applied when the observation equipment is operated.

However, if observation equipment is used to perform the reconnaissance operations of soldiers and police at night, if the user does not turn off the display of the observation equipment due to user's carelessness, operation failure or damage may occur due to exposing the position of the unit or unit .

In order to overcome such a problem, a technique has been recently developed that uses a proximity sensor to automatically supply power to a display according to proximity of a user to an observation device.

However, even if the power of the display is automatically supplied or cut off depending on whether the user is close to the observation equipment, the position of the self or the unit can be exposed by the light emitted from the display and the proximity sensor during use of the observation equipment . In particular, as the use of equipment that has been recently made to facilitate observation by amplifying minute light such as night vision is increasing, the proximity sensor is always operating even when the observation equipment is not in use. Accordingly, there is still a problem that the position of the user can be exposed due to a small amount of light emitted from the proximity sensor.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an observation device and method for controlling the intensity of light emitted from a display and a proximity sensor.

Another object of the present invention is to provide an observation apparatus and a method thereof capable of improving the characteristics of covert activities.

An observation method according to a feature of the present invention comprises the steps of: sensing an approaching state of an object to be measured to the observation device based on a signal from the proximity sensor, in an observation method using an observation device including a proximity sensor; Obtaining current time information and position information; And adjusting the intensity of light emitted from the proximity sensor or the intensity of light of the display unit of the observation apparatus based on at least one of the access state to the observation apparatus, the current time information, and the position information.

In addition, the observation method may further include a step in which the observation apparatus operates in a standby mode when it is determined that the measurement object is located outside the set distance based on the approach state.

The step of operating the observation apparatus in the standby mode may perform at least one of turning off the operation of the display unit and waiting for various application operations related to the operation of the observation apparatus.

The step of adjusting the intensity of light may include adjusting the intensity of light emitted from the proximity sensor or the intensity of light of the display unit of the observation device to a minimum intensity when the measurement object is detected as approaching within a set distance .

The step of adjusting the intensity of light may include adjusting the intensity of light emitted from the proximity sensor or the intensity of light of the display unit of the observation apparatus to a minimum intensity when the current time information corresponds to the preset time . The current time information may further include date information, and the set time may be set differently for each date.

The step of adjusting the intensity of the light may include adjusting the intensity of light emitted from the proximity sensor or the intensity of light of the display unit of the observation apparatus to a minimum intensity when the position information corresponds to the set position have.

The step of adjusting to the minimum intensity may determine the minimum intensity of light emitted from the proximity sensor based on the first exposure detectable distance and determine the minimum intensity of light of the display unit based on the second exposure detectable distance.

Wherein the first exposure detectable distance is calculated on the basis of the brightness of light emitted from the proximity sensor and reflected by the object and then transmitted through the atmosphere and the brightness that can be observed by a person, And can be calculated based on the brightness of the light transmitted through the atmosphere after being reflected by the object and the brightness that can be observed by the person.

In addition, the step of adjusting the intensity of the light may include adjusting the intensity of light emitted from the proximity sensor based on at least one of an access state of the observation device, the current time information, and the position information, And a step of adjusting a plurality of steps.

According to another aspect of the present invention, there is provided an observation apparatus comprising: a proximity sensor for sensing an access state of an object to be measured to an observation apparatus; A display unit; A time and position information acquiring unit for acquiring current time information and position information; And a light intensity controller for adjusting intensity of light emitted from the proximity sensor or light intensity of the display unit of the observation device based on at least one of an access state of the observation device, the current time information, and the position information.

The proximity sensor is positioned between two eyepieces of the observation device and can emit light in the infrared wavelength band.

The observation device may further include a proximity sensor window for transmitting light of an infrared wavelength band emitted from the proximity sensor and reducing transmittance of light other than the infrared wavelength band.

In addition, the display unit displays an image obtained through the observation device, and when it is determined that the measurement object is located outside the set distance based on the approach state measured by the proximity sensor, the display unit is turned off And may further include an image processing unit.

Meanwhile, the light amount control unit may control the light amount control unit in at least one of the case where the current time information corresponds to the set time, the case where the position information corresponds to the setting position, The intensity of light emitted from the proximity sensor or the intensity of light of the display unit can be adjusted.

The light intensity control unit adjusts intensity of light emitted from the proximity sensor or light intensity of the display unit to a minimum intensity, determines a minimum intensity of light emitted from the proximity sensor based on the first exposure- 2, the minimum intensity of light of the display unit can be determined based on the exposure-detectable distance.

Wherein the first exposure detectable distance is calculated on the basis of the brightness of light emitted from the proximity sensor and reflected by the object and then transmitted through the atmosphere and the brightness that can be observed by a person, And can be calculated based on the brightness of the light transmitted through the atmosphere after being reflected by the object and the brightness that can be observed by the person.

Wherein the light amount control unit controls the amount of light to be supplied to the proximity sensor when at least one of the current time information corresponds to the set time and the position information corresponds to the setting position, And the light intensity of the display unit can be adjusted by a plurality of steps.

According to an embodiment of the present invention, the intensity of light emitted from the display of the observation apparatus and the proximity sensor can be adjusted. In particular, the proximity sensor can be used to emit light of a wavelength band that is hard to be visually recognized, and the intensity of light from the proximity sensor or the display can be minimized depending on whether the observer approaches or not. In addition, since the light intensity can be minimized based on the time information and the position information, the brightness of the light emitted from the proximity sensor or the display is adjusted depending on the day, night, and position in which the observation device is used. Therefore, when an observer manages observation equipment, such as observation, surveillance, and reconnaissance equipment, it has the effect of maximizing the airway connotation of the self and the unit.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a structure of an observation apparatus according to an embodiment of the present invention; FIG.
2 is an exemplary view showing a use state of the observation device according to the present invention.
3 is a diagram illustrating an operation of an observation apparatus according to an embodiment of the present invention.
4 is a flow chart of an observation method according to an embodiment of the present invention.
5 is another exemplary view showing a use state of an observation apparatus according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

Hereinafter, an observation apparatus and a method thereof using a proximity sensor according to an embodiment of the present invention will be described with reference to the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a structure of an observation apparatus according to an embodiment of the present invention; FIG.

1, an observation apparatus 100 according to an exemplary embodiment of the present invention includes a proximity sensor 110 and a light amount control unit 120. The observation apparatus 100 includes a central processing unit 130, an image processing unit 140, A time and position information processor 160, a real time clock (RTC) 170, and a memory 180.

The proximity sensor 110 detects whether the observer approaches the measurement target, for example, the observer. The proximity sensor 110 emits light in an infrared (IR) wavelength band and detects whether the subject is approaching or not based on light reflected from an observer. The light from the proximity sensor 110 is emitted to the outside through the proximity sensor window 190 and transmitted through the light reflected from the observer to be measured and is incident on the proximity sensor 110. The proximity sensor window 190 may function as a filter that reduces light transmission in the visible light region and transmits light in the infrared light region. For example, a part to which a coating having an average transmittance of 5% or less in the visible light region (about 400 to 700 nm) and an average transmittance of 90% or more in the infrared region (about 700 to 1000 nm) can be applied to the proximity sensor window 190 .

The light intensity control unit 120 adjusts the intensity of light emitted from the proximity sensor 110. Also, the light amount controller 120 controls the intensity of light of the display unit 150. The light intensity control unit 120 uses at least one of the information provided from the proximity sensor 110 and the information provided from the time and position information processing unit 160 to measure the intensity of light emitted from the proximity sensor, Can be adjusted. This will be described later in more detail.

The image processing unit 140 processes the image and displays the image through the display unit 150. The image processing unit 140 operates the display unit 150 to process data provided from the central processing unit 150 and the light amount control unit 120 and displays the processed data through the display unit 150, That is, the intensity of light, of the display unit 150 according to the brightness of the display unit 150. The data (which may include image data) provided from the central processing unit 150 may be provided to the image processing unit 140 through the light amount control unit 120. [

The image processing unit 140 may turn on or off the display unit 150 under the control of the light amount control unit 120 or the central processing unit 130. [ For example, the light amount control unit 120 or the central processing unit 130 turns on the display unit 150 when the observer to be measured is positioned within the set distance based on the signal output from the proximity sensor 110, The controller 150 may provide a control signal for turning off the display unit 150 to the image processing unit 140. In this case,

The time and position information processing unit 160 acquires position information of the observation apparatus 100 and acquires time information and provides the time information to the central processing unit 150. For this, the location information processing unit 160 may be formed of a global positioning system (GPS). Here, the time information may include a date.

The clock unit 170 is a real time clock (RTC), and provides a clock signal for operation to each unit.

The central processing unit 150 controls operations of the respective units 110 to 180 of the observation apparatus 100 and various data and applications for operation of the observation apparatus 100 are stored in the memory 180.

The observation apparatus 100 having such a structure can be used as follows.

2 is an exemplary view showing a use state of the observation device according to the present invention.

2, the observer can observe the eyepiece portion A of the observation apparatus 100 by placing his / her eyes close to the observer's eye, and by using the interstage optical system (not shown) of the observation apparatus 100, So that an arbitrary subject can be observed. Here, the interstellar optical system and the eyepiece of the observation apparatus 100 are well-known technologies, and a detailed description thereof will be omitted.

When the observer does not operate the observation apparatus 100, that is, when the observer does not observe the object through the observation apparatus 100, if the display section 150 continues to operate, The face of the observer can be exposed to light through the light of the display unit 150 located at the position A of FIG. 2B, when the position of the observer is not positioned within the set distance by using the proximity sensor 110, the operation of the display unit 150 is automatically turned off, and the exposure of the observer by the light is automatically turned off Can be prevented.

3 is a diagram illustrating an operation of an observation apparatus according to an embodiment of the present invention.

3 (a), when the observation device 100 is determined by the proximity sensor 110 to be located at a position deviating from the set distance by the observer, To the standby mode. Here, the standby mode includes waiting for various application operations related to the operation of the observation apparatus 100, in addition to turning off the operation of the display unit 150. [ The central processing unit 130 can stop the execution of applications stored in the memory 180 in the standby mode and increase the operating time of the observation device 100. [

3 (b), when the proximity sensor 110 determines that the observer is located within the set distance, the central processing unit 130 operates the observation apparatus 100 in the active mode. Here, the active mode includes turning on the operation of the display unit 150 and driving various applications related to the operation of the observation apparatus 100. Also, the set distance may be the eye-to-eye distance D, which is the distance from the eye guard (not shown) located at the eyepiece of the observation apparatus to the eyes of the observer, as shown in FIG.

As described above, when the observer does not utilize the observation apparatus 100 within the set distance by using the proximity sensor, the display unit 150 is turned off, and the light emitted from the display unit 150, Can be prevented from being exposed to the outside.

However, when the observation apparatus 100 is used at night, the observer may be exposed to the outside by the light emitted from the proximity sensor 110 (light in the IR wavelength band).

In the embodiment of the present invention, the intensity of the light from the proximity sensor 110 and the display unit 150 is adjusted to minimize the possibility that an observer is exposed to the outside.

For this, in the embodiment of the present invention, by using at least one of the time information detected by the proximity sensor 110, the time information obtained from the position information processor 160 and the position information, And the intensity of light emitted from the display unit 150.

Specifically, when the proximity sensor 110 senses that the body of the observer is located within a set distance, the intensity of the light from the proximity sensor 100 or the display unit 150 is adjusted to a predetermined intensity. Here, the set distance for adjusting the intensity of the light may be different from the set distance for executing the standby mode including turning on / off the display unit 150, or may be the same. Hereinafter, for convenience of description, the set distance for executing the standby mode is referred to as a first set distance, and the set distance for adjusting the intensity of light is referred to as a second set distance.

If the time information obtained from the time and position information processing unit 160 corresponds to the set time, the intensity of the light from the proximity sensor 100 or the display unit 150 is adjusted to a set intensity. Here, the set time may be a time zone in which the light can be visually detected, for example, after 7 pm. However, depending on the date, there is no harm after 7 pm, so the light may not be detected by the naked eye. In consideration of this situation, the time information may include date information, and the set time for adjusting the intensity of light may be set differently according to the date.

Also, when the position information obtained from the time and position information processing unit 160 corresponds to the setting position, the light intensity of the proximity sensor 100 or the display unit 150 is adjusted to a set intensity.

As described above, the proximity sensor 100 and the display unit 150 can be controlled using at least one of the time information and the position information obtained from the time and position information processing unit 160, The intensity of the light can be adjusted to a set intensity. In the above description, only one parameter is used as an example, but the intensity of the light can be adjusted by using two or more parameters in combination. For example, the intensity of light may be adjusted when the current time is the set time while being located at the set position, or may be adjusted when the current time is detected within the second set distance while the current time is set.

Meanwhile, in the embodiment of the present invention, when the intensity of light of the proximity sensor 110 or the display unit 150 is adjusted, the intensity of the light is set to a minimum intensity Can be adjusted. That is, in the above-described exemplary situations, the intensity of the light from the proximity sensor 110 or the display unit 150 can be adjusted to a minimum intensity.

This minimum intensity can be set in consideration of the exposure-detectable distance.

The exposure-sensing distance is a distance at which the brightness of the proximity sensor or the display unit can be visually detected. The exposure-detectable distance can be calculated based on the brightness of the light emitted from the proximity sensor or the display unit, reflected by the object, and transmitted through the atmosphere, and the brightness that can be observed by the person. For example, an exposure-detectable distance can be obtained through an operation of dividing the brightness of light passing through the atmosphere after being reflected by an object into a brightness that can be observed by a person. At an exposure-detectable distance to the proximity sensor, the human-viewable brightness can indicate the brightness of light that can be observed by humans through night-time observation equipment such as night vision at night. However, the present invention is not limited to this.

Based on the fact that brightness is inversely proportional to the distance squared, the exposure detectable distance can be calculated as follows.

The exposure detectable distance to the display unit 150 can be calculated based on the following equation (1).

R1: Exposure detectable distance of the display unit [m]

E1: Light emission brightness of the display part [cd / m ² ]

θ: Light divergence angle [deg]

A: Object area [m ² ]

ρ: object reflectance

τ: atmospheric transmittance

S: Brightness that a person can observe [cd / m ² ]

Here, an object can represent a person's body.

In Equation (1), a value corresponding to "E1 × cos ² (θ) × A × ρ × τ" represents the brightness of light emitted from the display unit and reflected by the object and then transmitted through the atmosphere. Here, A and ρ can be arbitrarily set based on the body of a general person, and θ can be varied depending on the characteristics of the observation apparatus.

When the values of the respective parameters according to Equation 1 are given as an example, the exposure detectable distance R1 of the display unit 150 is R1 = (100 x cos ² (19) x 0.03 x 0.4 x 0.998 / 0.003) Can have a value of approximately "19 [m]" according to " ^1/2 ".

Further, the exposure detectable distance to the proximity sensor 110 can also be calculated based on the following equation (2).

E2: Brightness of light emitted from proximity sensor [Unit: lm]

I: Brightness that a person can observe

R2: Exposure detectable distance

τw: Transmittance of the proximity sensor window

θ: Half angle of the proximity sensor (unit, deg)

ρ: object reflectance,

Ao: Object area (unit, m ² )

τN: transmittance of the observation device

f: focal length of the observation device (unit, mm)

AN: Diameter area (unit, m ² ) of the object part of the optical system of the observation device

?: the minimum resolution (unit, lp / mm) of the zero tube (which is a component of a known technique used in the optical system of the observation apparatus)

L: Atmosphere illuminance (unit, lx),

K: contrast ratio (contrast and color difference between background and object)

S: luminous sensitivity of the observation device (unit, A / lm),

τA: atmospheric transmittance,

φ is the photocathode limiting light flow (unit, lm) of the observation device,

M: Signal to noise ratio of the observation device

When the values of the respective parameters according to Equation (2) above are exemplarily given, the exposure detectable distance R2 of the proximity sensor 110 is expressed as R2 = (0.005464 x 0.9 x cos ² (15) x 0.4 x 0.03 x 0.75 x 1.6 [m] "according to 26.5 x 0.001605 x 57 x 0.001 x 0.3 x 0.0007 x 0.999 / (4 x 10 ^-13 x 21)) ^1/2 .

The observation apparatus 110 sets the minimum intensity of light based on the exposure-detectable distance of the proximity sensor 110 or the display unit 150 calculated as described above, The brightness of the light of the proximity sensor 110 and / or the display unit 150 is set to a minimum intensity.

Also, the observation apparatus 110 can adjust the brightness of the light of the proximity sensor 110 and / or the display unit 150 according to a plurality of stages according to the condition that the condition according to the parameter for adjusting the light intensity is satisfied .

For example, when the body of the observer is positioned within the second predetermined distance by the proximity sensor 110, the intensity of the light from the proximity sensor 100 or the display unit 150 is set to a minimum intensity, When the body is located between the second set distance and the third set distance, the intensity of light from the proximity sensor 100 or the display unit 150 can be adjusted to another intensity that is brighter than the minimum intensity. In this case, the relationship of the first set distance <second set distance <third set distance can be satisfied.

When the time information corresponds to the set time, the intensity of the light from the proximity sensor 100 or the display unit 150 is adjusted to the minimum intensity. If the time information is earlier than the set time, Or the light intensity of the display unit 150 can be adjusted to a different setting intensity that is brighter than the minimum intensity.

When the position information corresponds to the setting position, the intensity of the light from the proximity sensor 100 or the display unit 150 is adjusted to a minimum intensity. When the position information is outside the first setting radius from the setting position and within the second setting radius If it is, adjust the light intensity to a different setting intensity that is brighter than the minimum intensity.

Next, an observation method based on an observation apparatus having such a structure will be described.

4 is a flow chart of an observation method according to an embodiment of the present invention.

The observation apparatus 100 according to the embodiment of the present invention can be used by being worn by an observer in the form as illustrated in FIG.

The observer (100) measures whether the user is approaching the body through the proximity sensor and the distance to the body (S100). That is, it measures the approach of the observer and the distance between the observer and the proximity sensor.

In addition, the observation apparatus 100 obtains current time information and position information of the observation apparatus from the time and position information processing unit 160 (S110). Here, the time information may include time and date.

If the distance measured through the proximity sensor is greater than the first predetermined distance, the observer determines that the observer is not using the observer, and turns off the display unit 150 (S120, S130). For example, as shown in FIG. 3 (a), the apparatus enters a standby mode to turn off the display unit 150 and stop execution of applications stored in the memory 180.

On the other hand, when the distance measured through the proximity sensor is less than the first predetermined distance, the observer determines that the observer desires to use the observer 100, and if the measured distance is within the second predetermined distance It is determined that the observer is approaching (S140).

 If the current time corresponds to the set time or the current position corresponds to the set position while the observer approaches the second set distance, the light intensity of the proximity sensor 110 and / or the display unit 150 may be adjusted do. In this case, as described above, the light intensity can be adjusted to a minimum intensity or a plurality of steps according to the set time, the set position, or the approach state (S150, S160, S170).

In this case, the determination step S140 based on the second set distance may be selectively performed. If it is determined that the observer is located within the first predetermined distance, the following steps are performed without performing step S140 .

By such an observation method, as shown in FIG. 5, the face exposure of the observer can be minimized.

5 is another exemplary view showing a use state of an observation apparatus according to an embodiment of the present invention.

If the current time corresponds to the preset time or the current position corresponds to the set position even in a situation where the observer desires to use the observation apparatus 100, the intensity of the light from the proximity sensor and / or the display unit The face exposure can be minimized.

The embodiments of the present invention described above are not necessarily implemented by apparatuses and methods but may be implemented by a program capable of executing functions corresponding to the configuration of the method according to the embodiment of the present invention or a computer And the present invention can be easily implemented by those skilled in the art from the description of the embodiments described above.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (18)

In an observation method using an observation device including a proximity sensor,
Sensing an access state of the measurement object to the observation device based on a signal from the proximity sensor;
Operating the observation apparatus in a standby mode when it is determined that the measurement object is located outside the first set distance based on the approach state; And
Adjusting the intensity of light emitted from the proximity sensor and the intensity of light of the display unit of the observation apparatus when it is determined that the measurement object is within the second set distance based on the approach state,
/ RTI &gt; delete The method of claim 1, wherein
Wherein the step of operating the observation apparatus in the standby mode performs at least one of turning off the operation of the display unit and waiting for various application operations related to the operation of the observation apparatus. The method of claim 1, wherein
The step of adjusting the intensity of light
Adjusting the intensity of light emitted from the proximity sensor and the intensity of light of the display unit of the observation device to a minimum intensity when the measurement object is detected to approach within the second set distance;
/ RTI &gt; The method of claim 1, wherein
Acquiring current time information
Further comprising:
The step of adjusting the intensity of light
Adjusting the intensity of light emitted from the proximity sensor and the intensity of light of the display unit of the observation apparatus to a minimum intensity when the current time information corresponds to the preset time
/ RTI &gt; The method of claim 5, wherein
Wherein the current time information further includes date information, and the set time is set differently for each date. In an observation method using an observation device including a proximity sensor,
Obtaining positional information of the observation device;
Adjusting at least one of light intensity emitted from the proximity sensor and light intensity of the display unit of the observation apparatus to a first intensity when the position information corresponds to the setting position; And
When the position information is located outside the first setting radius and within the second setting radius from the set position, the intensity of at least one of the intensity of light emitted from the proximity sensor and the intensity of light of the display unit of the observation apparatus is The step of adjusting to the second century
/ RTI &gt;
The first intensity is the second century,
Wherein a minimum intensity of light emitted from the proximity sensor is determined based on a first exposure detectable distance and a minimum intensity of light of the display unit is determined based on a second exposure detectable distance. The method according to any one of claims 4 to 6, wherein
Wherein a minimum intensity of light emitted from the proximity sensor is determined based on a first exposure detectable distance and a minimum intensity of light of the display unit is determined based on a second exposure detectable distance. The method of claim 8, wherein
The first exposure sensing distance is calculated on the basis of brightness of light emitted from the proximity sensor and reflected by the object,
Wherein the second exposure detectable distance is calculated based on brightness of light emitted from the display unit and reflected by an object and then transmitted through the atmosphere and brightness that can be observed by a person. The method of claim 1, wherein
Obtaining current time information and location information of the observation apparatus
Further comprising:
The step of adjusting the intensity of light
Adjusting the intensity of the light emitted from the proximity sensor and the intensity of light of the display unit of the observation device based on at least one of the access state to the observation device, the current time information, and the positional information by a plurality of steps Includes an observation method. A proximity sensor for sensing an access state of the measurement object to the observation device;
A display unit;
And displays the image obtained through the observation device on the display unit and turns off the display unit when it is determined that the measurement object is out of the first set distance based on the approach state measured by the proximity sensor An image processor; And
And controls the intensity of light emitted from the proximity sensor and the intensity of light of the display unit of the observation apparatus when it is determined that the measurement object is within the second set distance based on the approach state measured by the proximity sensor The light-
&Lt; / RTI &gt; The method of claim 11, wherein
Wherein the proximity sensor is positioned between two eyepieces of the observation device and emits light in an infrared wavelength band. The method of claim 12, wherein
Further comprising a proximity sensor window that transmits light of an infrared wavelength band emitted from the proximity sensor and reduces transmittance of light other than the infrared wavelength band. delete The method of claim 11, wherein
A time and position information acquiring unit for acquiring current time information and position information,
Further comprising:
Wherein the light amount control unit controls the light amount control unit in a case where the measurement target is detected as approaching within the second set distance, at least one of the case where the current time information corresponds to the set time, And controls intensity of light emitted from the proximity sensor and intensity of light of the display unit. The method of claim 15, wherein
The light intensity control unit adjusts intensity of light emitted from the proximity sensor or light intensity of the display unit to a minimum intensity, determines a minimum intensity of light emitted from the proximity sensor based on the first exposure- 2 The minimum intensity of light of the display unit is determined based on the exposure-detectable distance. The method of claim 16, wherein
The first exposure sensing distance is calculated on the basis of brightness of light emitted from the proximity sensor and reflected by the object,
Wherein the second exposure detectable distance is calculated based on brightness of light emitted from the display unit and reflected by an object and then transmitted through the atmosphere and brightness that can be observed by a person. The method of claim 15, wherein
Wherein the light amount control unit controls the amount of light to be supplied to the proximity sensor when at least one of the current time information corresponds to the set time and the position information corresponds to the setting position, And adjusts the intensity of light emitted from the display unit or the intensity of light of the display unit by a plurality of steps.

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