Distance meter

Abstract

No user operation is required, and the screen brightness can be instantly adjusted to make it easy to see in environments where the brightness of external light changes. [Solution] The screen dimming mechanism 40 has an external light sensor 41 that detects the intensity of external light, and a screen brightness adjustment unit 42 that has a correspondence table 45 between the light intensity level of external light and the screen brightness level and outputs screen brightness level information corresponding to the light intensity detected by the external light sensor 41, and has an automatic dimming function that adjusts the screen brightness of the display 29 based on the screen brightness level information from the screen brightness adjustment unit 42.

Description

[Technical Field]

[0001] The present invention adjusts the brightness (luminance) of the display screen. Ru picture This relates to a rangefinder that uses a surface dimming mechanism. [Background technology]

[0002] Various golf rangefinders have been proposed (for example, Patent Document 1). Golf rangefinders include a telescope unit, a distance measurement unit that measures the distance to a target magnified by the telescope unit, and a display that displays data measured by the distance measurement unit.

[0003] The display screen can be difficult to see depending on the external light conditions. In particular, since golf is played outdoors, the external light conditions have a significant impact on the viewing environment of the display screen. For this reason, displays that allow the user to manually adjust the screen brightness (luminance) have been proposed. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-203188 Summary of the Invention [Problem to be solved by the invention]

[0005] However, conventional manual dimming methods require user intervention, which means they cannot immediately respond to changes in the brightness of external light. For example, if the screen brightness (luminance) is set to low and the user moves to a brighter environment, the screen may become difficult to see, or may become completely invisible. Furthermore, if the screen brightness (luminance) is set to high and the user moves to a darker environment, the screen becomes too bright and difficult to see. Furthermore, conventional manual dimming methods require the user to perform an operation, which is troublesome for the user.

[0006] Therefore, the present invention is capable of instantly adjusting the screen brightness (luminance) to a level that is easy to see in an environment where the brightness of the external light changes, without requiring any user operation. Ru picture The object is to provide a rangefinder equipped with a surface dimming mechanism. [Means for solving the problem]

[0007] The present invention has been made in view of the above problems, The device is equipped with a screen dimming mechanism and includes a telescope unit and a measurement / display unit, and the screen dimming mechanism includes: The device is provided with an external light sensor that detects the intensity of external light, and a screen brightness adjustment unit that has a correspondence table between the external light intensity level and the screen brightness level, and outputs screen brightness level information corresponding to the light intensity detected by the external light sensor, and has an automatic light adjustment function that adjusts the screen brightness of the display according to the screen brightness level information from the screen brightness adjustment unit. The telescope unit is provided with a half mirror onto which the display screen of the display is illuminated, and the telescope unit displays an enlarged image that the user can see by combining the display screen with the enlarged image. The measurement / display unit measures various distances and the like related to the target enlarged by the telescope unit, and creates and displays display data related to the measurements. Characterized by distance meter is. [Effects of the Invention]

[0009] According to the present invention, the screen brightness can be instantly adjusted to a level that is easy to see in an environment where the brightness of the external light changes, without the need for user operation. [Brief explanation of the drawings]

[0010] The drawings illustrate specific embodiments of the invention according to the present disclosure, including essential features of the invention as well as alternative and preferred embodiments. [Figure 1] FIG. 2 is a perspective view showing the appearance of the laser rangefinder according to the embodiment. [Figure 2] FIG. 2 is an exploded perspective view of the laser rangefinder with the front case removed from the main body case, showing the present embodiment. [Figure 3] FIG. 2 is a perspective view of the laser rangefinder with the front case, rear case, and main body case removed, showing the present embodiment. [Figure 4] 1A shows the present embodiment, and FIG. 1B shows a partially cutaway rear view of the laser rangefinder. [Figure 5] FIG. 1 is a schematic configuration diagram of a laser rangefinder according to an embodiment of the present invention. [Figure 6] FIG. 10 is a diagram illustrating the data contents of the correspondence table according to the embodiment. [Figure 7] FIG. 2 is a diagram showing the present embodiment and illustrating main display objects on the display screen of the display. [Figure 8] 4 is a schematic flowchart illustrating the operation of the laser rangefinder according to the embodiment. [Figure 9] 10A and 10B are diagrams illustrating the present embodiment and explaining the display content in a screen dimming switching mode of the display. DETAILED DESCRIPTION OF THE INVENTION

[0011] Each embodiment will be described in detail below with reference to the accompanying drawings. In these embodiments, a description of already known technologies will be omitted. Furthermore, the following merely illustrates devices and methods for embodying the technical concept of the invention, and the technical concept of the present invention is not limited to the following. Various modifications can be made to the technical concept of the present invention within the scope of the claims. It should be noted that the drawings are schematic and may differ from the actual product.

[0012] 1 to 9 show one embodiment of the present invention. The rangefinder of this embodiment is a laser rangefinder 1 that uses a screen dimming mechanism 40. Since the laser rangefinder 1 is suitable for use in golf, the case where it is used by a golf player will be described as an example.

[0013] 1 to 4, the laser rangefinder 1 is exteriorly housed in a case 2. The case 2 is exteriorly housed by a main case part 2a that has openings on the front and back and covers all peripheral side surfaces, a front case part 2b that is disposed at the front opening of the main case part 2a, and a rear case part 2c that is disposed at the rear opening of the main case part 2a.

[0014] An upper light passage hole 3 and a lower light passage hole 4 are provided at the top and bottom positions of the front case portion 2b. A focus adjustment ring 5 is provided at the top of the rear case portion 2c. The focus adjustment ring 5 protrudes rearward from the rear case portion 2c. The focus adjustment ring 5 is provided so as to be rotatable within a predetermined range relative to the rear case portion 2c (see the arrow in FIG. 4). The focus adjustment ring 5 has a single light passage hole 6 (shown in FIG. 4(b)).

[0015] An internal frame member 7 is housed inside the case 2. A main board 8 (shown in FIG. 3), multiple flexible boards 9 (shown in FIG. 3), etc. are arranged on the outer surface of the internal frame member 7. The main components of the laser rangefinder 1 are attached to the internal frame member 7.

[0016] As shown in Figure 5, the main components of the laser rangefinder 1 include a telescope section 10 of the optical system and a measurement / display section 20 that measures various distances to targets magnified by the telescope section 10 and creates and displays display data related to the measurements.

[0017] The telescope unit 10 has an objective lens 11, an erecting prism (not shown), a half mirror 13, and an eyepiece lens 14. These optical components are arranged in a straight line. The objective lens 11 is located at a position corresponding to the lower light passage hole 4. The eyepiece lens 14 is located at a position corresponding to the light passage hole 6 within the focus adjustment ring 5. By rotating the focus adjustment ring 5, the position of the eyepiece lens 14 on the optical path can be adjusted, allowing the focus of the magnified image of the target obtained by the objective lens 11 and the eyepiece lens 14 to be adjusted.

[0018] The measurement / display unit 20 has a power / measurement button 21 and a mode / set button 22 which are mode selection buttons, various sensors, a laser emitter 26, a laser receiver 27, a microcontroller unit (hereinafter referred to as MCU) 28, and a display 29.

[0019] The power / measurement button 21 and mode / set button 22 are each push-buttons that automatically return to their original positions when the pressing force is released. Operation information for the power / measurement button 21 and mode / set button 22 is output to a microcontroller unit (MCU) 28, and the measurement display switching mode, various measurement display modes, setting switching modes, and various setting modes can be selected depending on the pressing operation pattern of the power / measurement button 21 and mode / set button 22. The specific contents of the selectable measurement display modes and setting modes are described in detail below.

[0020] The various sensors are a tilt sensor 23, a position sensor 24, and an azimuth angle sensor 25, and the information detected by these sensors is output to a microcontroller unit (MCU) 28. The tilt sensor 23 uses the position of the laser rangefinder 1 as a reference and detects the tilt angle of a target that appears magnified by the telescope unit 10. The position sensor 24 detects the current position of the laser rangefinder 1. The azimuth angle sensor 25 uses the position of the laser rangefinder 1 as a reference and detects the azimuth angle of a target that appears magnified by the telescope unit 10.

[0021] The laser emitter 26 emits laser light to the outside via a laser irradiation lens 32. The laser irradiation lens 32 is disposed at a position corresponding to the lower light passing hole 4. The laser receiver 27 receives the laser light reflected from the target via a laser receiving lens 30. The laser receiving lens 30 focuses the laser light and is disposed at a position corresponding to the upper light passing hole 3.

[0022] That is, the laser light emitted from the laser emitting unit 26 is reflected by the target that is magnified and visible through the telescope unit 10, and this reflected laser light is received by the laser receiving unit 27. The basic function of the laser rangefinder 1 is to measure the distance to the target by measuring the time from when the laser light is emitted from the laser emitting unit 26 to when it is received by the laser receiving unit 27.

[0023] The microcontroller unit (MCU) 28 controls all parts of the laser rangefinder 1. The microcontroller unit (MCU) 28 integrates a central processing unit (CPU), a timer, an internal memory, etc., and executes various processing programs stored in the internal memory. The contents of the processing programs necessary for explaining the present invention will be explained in the section explaining the operation.

[0024] The display 29 is attached to the main substrate 8. In this embodiment, the display 29 is configured as an organic light-emitting display (OLED). The display screen of an organic EL display is configured by regularly arranging organic EL elements vertically and horizontally. Each organic EL element emits light naturally when a current is passed through it individually, and emits light at a brightness that corresponds to the amount of current passed through it. In other words, the brightness (luminance) of each organic EL element is adjusted according to the amount of current passed through it.

[0025] The display 29 displays an image based on display data from a microcontroller unit (MCU) 28. The display screen of the display 29 is illuminated onto the half mirror 13, and the display screen reflected by the half mirror 13 is visible when the user looks through the eyepiece 14 of the telescope unit 10. The display screen of the display 29 is superimposed on the magnified image seen through the telescope unit 10. When the power is on, a user looking through the eyepiece 14 in the focus adjustment ring 5 sees an image obtained by superimposing the magnified image seen through the telescope unit 10 on the display screen of the display 29.

[0026] The measurement / display unit 20 is equipped with a screen dimming mechanism 40. The screen dimming mechanism 40 has an external light sensor 41 and a screen brightness adjustment unit 42. In this embodiment, the screen brightness adjustment unit 42 is provided in the microcontroller unit (MCU) 28. The screen brightness adjustment unit 42 may be provided separately from the microcontroller unit (MCU) 28.

[0027] The external light sensor 41 is disposed on the front surface of the internal frame member 7. The external light sensor 41 detects the intensity of external light (natural light) guided through a light guide member 44 (shown in FIG. 2) disposed in the through-hole 2d of the front case portion 2b. The external light sensor 41 detects the intensity of external light incident from the front side of the laser rangefinder 1, that is, the light intensity in the direction in which the user looks into the telescope portion 10.

[0028] Screen brightness adjustment unit 42 has a correspondence table 45 between the light intensity level of external light and the screen brightness (luminance) level. As shown in Fig. 6, correspondence table 45 divides the light intensity level of external light into five stages, and the screen brightness (luminance) level of display 29 corresponding to each stage is represented by numerical data from 1 to 5. In this embodiment, correspondence table 45 is stored in an internal memory in microcontroller unit (MCU) 28.

[0029] The screen brightness adjustment unit 42 has an automatic dimming function that adjusts the screen brightness (luminance) of the display 29 according to the light intensity detected by the ambient light sensor 41, and a manual dimming function that manually adjusts the screen brightness (luminance) of the display 29. The automatic dimming function and the manual dimming function adjust the screen brightness (luminance) of the display screen using the same correspondence table 45 shown in FIG. 6. The automatic dimming function and the manual dimming function are selected by a screen dimming switching mode. The screen dimming switching mode will be explained in the operation explanation below.

[0030] When the automatic light adjustment function is selected, screen brightness adjustment unit 42 outputs screen brightness (luminance) level information corresponding to the light intensity detected by external light sensor 41 to display 29 based on the data in correspondence table 45, and the display screen of display 29 is displayed at that screen brightness (luminance) level. For example, when external light sensor 41 detects a light intensity within a range of 401 lux to 1500 lux, screen brightness (luminance) level information of level 3 is output to display 29, and the display screen of display 29 is displayed at the brightness (luminance) of level 3.

[0031] When the manual dimming function is selected, screen brightness adjustment unit 42 outputs the screen brightness (luminance) level selected by the user to display 29, and the display screen of display 29 is displayed at that screen brightness (luminance). For example, when the screen brightness (luminance) level selected by the user is level 4, screen brightness adjustment unit 42 outputs that level information to display 29, and the display screen of display 29 is displayed at the brightness (luminance) of level 4.

[0032] 5, the laser rangefinder 1 has a vibration motor 50, a charging lamp 52, and a power lamp 53, which are also controlled by the microcontroller unit (MCU) 28. The laser rangefinder 1 also has a built-in rechargeable battery 54. Power is supplied from the rechargeable battery 54 to the microcontroller unit (MCU) 28 and the like.

[0033] Next, we will explain the contents displayed on the display screen of the display 29. Figure 7 shows the main display items displayed on the display screen of the display 29.

[0034] The display elements indicate the central area of ​​the display screen and include a target mark 31b for locating the target, the word "SLOPE" 31c indicating slope mode, a flag mark 31d indicating pinlock mode, an "S" 31e indicating straight-line distance measurement mode, a vibration mark 31f indicating vibration mode, an elevation difference (upward / downward launch) indicator 31g, a mark 31h indicating three-point measurement mode, a mark 31i indicating the remaining battery level, a "SET" 31j indicating setting change mode, a sun mark 31k indicating screen dimming mode within the setting change mode, a "m" 31l indicating meters, a "Y" 31m indicating yards, and a "km / h" 31n indicating speed. The display screen also includes three numeric display sections 31o, 31p, and 31q for displaying measurement values. The numeric display sections 31o, 31p, and 31q are, for example, seven-segment displays, and each displays a measurement value.

[0035] These indicators, except for the target mark 31b, are selectively displayed according to the selected mode. The modes that can be selected are roughly divided into a measurement / display switching mode and a setting switching mode. The types of modes that can be selected in the measurement / display switching mode and the types of modes that can be selected in the setting switching mode will be explained in the operation explanation below.

[0036] Next, an outline of the operation of the laser rangefinder 1 will be explained based on the flowchart in Figure 8. When the power / measurement button 21 is pressed briefly (step S1), the power is turned on (step S2). When the mode / set button 22 is pressed while the power is on (step S3), the measurement / display switching mode is selected (step S4). In the measurement / display switching mode, the selectable measurement / display mode is switched each time the mode / set button 22 is pressed. The first press switches to "straight-line distance measurement mode," the second press switches to "pin lock mode," the third press switches to "slope mode," the fourth press switches to "companion (three-point measurement) mode," the fifth press switches to "horizontal / vertical distance measurement mode," and the sixth press switches to "speed measurement mode," allowing the user to select the desired measurement / display mode.

[0037] The straight-line distance measurement mode measures the straight-line distance from the laser rangefinder 1 to the target. The pin lock mode automatically detects the pin flag and locks onto it as the nearest target. The slope mode measures the corrected distance (uphill and downhill), vertical height, and straight-line distance. The three-point distance measurement mode measures the straight-line distance and corrected distance between any two points in space. The horizontal and vertical distance measurement mode measures the straight-line distance, horizontal distance, and vertical height to the target. The speed measurement mode measures the speed of a moving object.

[0038] When a predetermined measurement / display mode is selected in the measurement / display switching mode, an indicator indicating the selected measurement / display mode and a measured value when that measurement is made are displayed on the display 29. For example, when the straight-line distance measurement mode is selected, "S" 31e is displayed on the screen of the display 29, and after measurement, the measured value is displayed on the numeric display section 31o.

[0039] When the mode / set button 22 is pressed and held (for example, for two seconds or more) while the power is on (step S5), the setting switching mode is selected (step S6). In the setting switching mode, when the power / measurement button 21 is pressed (step S7), the mode switches to the screen dimming switching mode (step S9). Then, as shown in Fig. 9, each time the power / measurement button 21 is pressed, the screen switches in the following order: automatic dimming selection screen, manual dimming level 1 selection screen, manual dimming level 2 selection screen, manual dimming level 3 selection screen, manual dimming level 4 selection screen, and manual dimming level 5 selection screen.

[0040] 9 in detail, on the automatic light control selection screen, the letter "A" 31r (shown in FIG. 9) indicating the automatic light control mode is displayed in the numeric display section 31o, along with the letter "SET" 31j indicating the setting mode and a sun mark 31k indicating the screen light control mode. Selecting this selection screen selects the automatic light control mode. On the manual light control level 1 selection screen, the letter "SET" 31j indicating the setting mode and a sun mark 31k indicating the screen light control mode are displayed in the numeric display section 31o, along with the number "1" indicating level 1 of the manual light control mode. The number 1 indicates the selected screen brightness (luminance) level, and selecting this selection screen selects screen brightness (luminance) level 1 of the manual light control mode. The selection screens for manual light control level 2 and onwards are similar.

[0041] Furthermore, the brightness (luminance) of the selection screen of the display 29 changes according to the selected screen brightness (luminance) level, so the user can actually see the change in the brightness (luminance) of the screen and select the desired brightness (luminance).

[0042] As described above, in the screen dimming switching mode, the user can select between the automatic dimming mode and the manual dimming mode, and can also select the screen brightness (luminance) level in the manual dimming mode.

[0043] When the mode / set button 22 is pressed after powering on (step S8), the selectable setting mode is switched. Pressing the button a first time switches to a unit switching mode in which the "unit" between yards and meters is selected, pressing the button a second time switches to a vibration alarm on / off switching mode in which the "vibration alarm" is turned on or off, and pressing the button a third time ends the setting switching mode (step S10). When the user selects the desired selection screen, the corresponding setting content is set. When a predetermined time (for example, 20 seconds) has passed since the last button operation, the power is turned off.

[0044] As described above, the screen dimming mechanism 40 includes an external light sensor 41 that detects the light intensity of external light, and a screen brightness adjustment unit 42 that has a correspondence table 45 between the light intensity level of external light and the screen brightness (luminance) level and outputs screen brightness (luminance) level information corresponding to the light intensity detected by the external light sensor 41, and has an automatic dimming function that adjusts the screen brightness (luminance) of the display 29 based on the screen brightness (luminance) level information from the screen brightness adjustment unit 42.

[0045] Therefore, the screen brightness (luminance) of display 29 is automatically adjusted according to the intensity of external light, so that the screen brightness (luminance) can be instantly adjusted to be easy to see in environments where the brightness of external light changes, without the need for user operation. This significantly reduces the discomfort felt by the user by changes in external light. Furthermore, in environments where the intensity of external light is low, the display screen of display 29 automatically becomes dark, so power consumption can be reduced in dark environments.

[0046] The screen dimming mechanism 40 has an automatic dimming function that adjusts the screen brightness (luminance) of the display 29 according to the light intensity detected by the external light sensor 41, as well as a manual dimming function that allows the user to manually select the screen brightness (luminance) of the display 29. Therefore, the brightness (luminance) of the display screen can be adjusted to suit the user's preferences, regardless of the light intensity of external light.

[0047] In the screen dimming switching mode, the display screen of the display 29 displays a message indicating that the mode is the screen dimming switching mode, the automatic dimming selection screen displays a message indicating that automatic dimming has been selected, and the manual dimming selection screen displays a message indicating the screen brightness (luminance) level for manual dimming. This allows the user to quickly and reliably recognize the selected content, resulting in excellent usability for the user.

[0048] In the manual dimming function, screen brightness adjustment unit 42 allows the user to select a brightness level from correspondence table 45 and fixes the screen brightness of display 29 at the selected brightness level. In the manual dimming mechanism, the user can freely select from five brightness levels in correspondence table 45. In other words, in the automatic dimming function, the brightness level of the display screen is automatically adjusted based on the light intensity detected by ambient light sensor 41, but in the manual dimming function, it is fixed at the brightness level selected by the user. Therefore, the automatic dimming function and the manual dimming function can apply the brightness levels from the same correspondence table 45, which simplifies the configuration and reduces the amount of data stored.

[0049] The laser rangefinder 1 is equipped with a screen dimming mechanism 40 and a telescope unit 10, and the display screen of the display 29 is superimposed on the magnified image seen by the telescope unit 10. Therefore, the display information of the display 29, which is displayed superimposed on the magnified image of the telescope unit 10, is displayed at an appropriate screen brightness (luminance), making it easy for the user to use.

[0050] The device has a power / measurement button 21 and a mode / set button 22, which are mode selection buttons, and is configured so that various measurement / display modes and various setting modes can be selected using the power / measurement button 21 and the mode / set button 22, respectively, and the display 29 shows the contents of the selected measurement / display mode or setting mode.

[0051] Therefore, the contents of the selected measurement display mode or setting mode can be visually confirmed, which is convenient for the user.

[0052] The external light sensor 41 detects light incident through the through-hole 2d of the front case portion 2b. In other words, the external light sensor 41 detects the light intensity in the direction in which the user looks into the telescope portion 10. Therefore, since the external light intensity perceived by the user looking into the telescope portion 10 is detected, the brightness (luminance) of the display screen of the display 29 can be automatically adjusted according to the light intensity perceived by the user.

[0053] In this embodiment, the screen light adjustment mechanism 40 is mounted on the laser rangefinder 1, but it may also be mounted on a device other than a rangefinder.

[0054] In this embodiment, the rangefinder is a laser rangefinder 1, but it may be a rangefinder that uses something other than a laser (for example, ultrasonic waves). In other words, the present invention is applicable to any device that displays an image displayed on display 29 superimposed on a first image.

[0055] In this embodiment, the laser rangefinder 1 is used for golf, but it can of course also be used for purposes other than golf.

[0056] In this embodiment, the display 29 of the screen dimming mechanism 40 is formed from an organic light-emitting diode (OLED), but it may be a display other than an organic light-emitting diode (OLED), such as a liquid crystal display. In a liquid crystal display, the brightness (luminance) of the backlight is adjusted.

[0057] In this embodiment, the correspondence table 45 divides the light intensity of external light into five stages, but multiple stages other than five may be used, and the more stages there are, the more detailed the screen brightness (luminance) can be realized.

[0058] Although each embodiment has been described in detail above, the present invention is not limited to the specific embodiments, and various modifications and changes are possible within the scope of the claims.

[0059] Furthermore, the present invention can include at least the following embodiments, which can be adopted separately or in combination with each other. (1) The device is equipped with a screen dimming mechanism and includes a telescope unit and a measurement / display unit, and the screen dimming mechanism includes: The device includes an external light sensor that detects the intensity of external light, and a screen brightness adjustment unit that has a correspondence table between the external light intensity level and the screen brightness level and outputs screen brightness level information corresponding to the light intensity detected by the external light sensor, and adjusts the screen brightness of the display according to the screen brightness level information from the screen brightness adjustment unit. A rangefinder having an automatic light control function, wherein the telescope unit is provided with a half mirror onto which the display screen of the display is illuminated, and wherein the telescope unit displays an enlarged image that the user can see by combining the display screen with the enlarged image, and wherein the measurement / display unit measures various distances and the like related to a target enlarged by the telescope unit, and creates and displays display data related to the measurements. is. (2) The screen dimming mechanism includes: In addition to an automatic brightness adjustment function that adjusts the screen brightness of the display according to the light intensity detected by the external light sensor, a manual brightness adjustment function that allows the user to manually select the screen brightness of the display is provided. do. (3) The screen dimming mechanism includes: In the screen dimming switching mode, a display indicating that the display is in the screen dimming switching mode is made on the display screen of the display, and a display indicating that automatic dimming has been selected is made on the automatic dimming selection screen, and a display indicating the screen brightness level in manual dimming is made on the manual dimming selection screen. cormorant. (4) The screen brightness adjustment unit is configured to allow a brightness level in the correspondence table to be selected in the manual dimming function, and fix the screen brightness of the display at the selected brightness level. do.

[0060] (5) The rangefinder isThe device has a mode selection button, and is configured so that various measurement display modes and various setting modes including a manual light adjustment mode can be selected by the mode selection button, and the display shows the contents of the selected measurement display mode or setting mode. cormorant. (6) The rangefinder is The external light sensor Sa is and detecting the light intensity in the direction in which the user looks into the telescope unit. do. [Explanation of symbols]

[0061] 1 Laser rangefinder (distance meter) 10 Telescope section 20 Measurement / display section 21 Power / Measurement Button (Mode Selection Button) 22 Mode / Set button (mode selection button) 29 Display 40 Screen dimming mechanism 41 Ambient light sensor 42 Screen brightness adjustment section 45 compatible table

Claims

1. A device equipped with a screen dimming mechanism and including a telescope unit and a measurement / display unit, The screen dimming mechanism includes: an external light sensor for detecting the intensity of external light; and a screen brightness adjustment unit having a correspondence table between the light intensity level of external light and the screen brightness level, and outputting screen brightness level information corresponding to the light intensity detected by the external light sensor; The display device may have an automatic brightness control function that adjusts the screen brightness of the display in accordance with the screen brightness level information from the screen brightness adjustment unit, The telescope unit includes: a half mirror through which a display screen of the display is illuminated; a display screen of the display is synthesized with an enlarged image that can be seen by the user through the telescope unit and displayed; The measurement / display unit The telescope unit measures various distances to the magnified target, and creates and displays display data relating to the measurements. A rangefinder characterized by:

2. The rangefinder described in claim 1, characterized in that the screen dimming mechanism has an automatic dimming function that adjusts the screen brightness of the display according to the light intensity detected by the external light sensor, as well as a manual dimming function that allows the screen brightness of the display to be manually selected.

3. The rangefinder described in claim 2, characterized in that in the screen dimming switching mode, the screen dimming mechanism displays on the display screen an indication that the mode is screen dimming switching mode, and in the automatic dimming selection screen displays an indication that automatic dimming has been selected, and in the manual dimming selection screen displays an indication of the screen brightness level with manual dimming.

4. 3. The rangefinder according to claim 2, wherein the screen brightness adjustment unit is capable of selecting a brightness level from the correspondence table in a manual dimming function, and fixes the screen brightness of the display at the selected brightness level.

5. 2. The rangefinder according to claim 1, further comprising a mode selection button, which is configured to allow selection of various measurement display modes and various setting modes including a manual dimming mode, and which displays on the display the contents of the selected measurement display mode or setting mode.

6. 2. The rangefinder according to claim 1, wherein the external light sensor detects the intensity of light in a direction in which a user looks into the telescope unit.

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