JP2004198386A - Range finding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a range finding device that allows visual field to be sufficiently large for collimation and that enables clear data display. <P>SOLUTION: The range finding device has a light-sending system, collimation system, data display system, light-receiving system and processing system. The light-sending system has a measuring light source 5, a relay lens 6, a first prism 100 and an objective lens 10 for common use in transmission and collimation. The first prism 100 has splitting and composition surfaces. The splitting surface is a junction surface A of a first small prism 1 and a second small prism 2, and the composition surface is a junction surface B of the first small prism 1 and a third small prism 3. The collimation system has the objective lens 10 for common use in transmission and collimation, the first prism 100, a second prism 4, an eyepiece 11 and a reticle 12. The data display system has a data display element 7 and image-forming lens 8. The light-receiving system has an objective lens 40, filter 41 and light receiving element 42. The processing system has a signal processing apparatus 50. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
[Industrial applications]
The present invention relates to a distance measuring device having a collimating optical system and a data display system.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, various means have been used in order to display information such as a distance and an angle to a target object to be collimated within a visual field of a collimation optical system without turning the eyes away from the target object.
[0003]
FIG. 6 is a conventional example of a device that displays a part of a compass in a field of view and provides azimuth information of a target object (for example, Patent Documents 1 and 2). An image 13 of a target object is observed on the reticle 12 by a collimating optical system including the objective lens 10, the erecting prism 14, and the reticle 12.
[0004]
On the other hand, the azimuth scale of the compass 15 illuminated by the natural light or the light source is also imaged on the reticle 12 via the lens 16 and the bending mirror 17.
[0005]
The aperture 18 is for masking a part of the observation visual field to display the azimuth scale, and has a window 19 for displaying the azimuth scale as shown in FIG. Is displayed.
[0006]
In a distance measuring device that measures the distance to an object using a laser diode, the reticle 12 is a transmissive liquid crystal display element, and data such as the distance measurement value and the remaining battery capacity are stored in the visual field of the collimating optical system. Means for displaying have been used (for example, Patent Documents 3, 4, and 5).
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2001-13420, "Binoculars with Compass"
[Patent Document 2]
Japanese Patent Application Laid-Open No. 7-43162 "Azimuth meter"
[Patent Document 3]
JP-A-09-210686 "Observation device"
[Patent Document 4]
Japanese Patent Application Laid-Open No. 60-144610, "Display means of surveying instrument"
[Patent Document 5]
Registered Utility Model No. 3074643, "Ranging Binoculars"
[0007]
[Problems to be solved by the invention]
However, the method of masking a part of the field of view as a data-only area as in the conventional example of FIG. 6 has no problem as long as the data display capacity is small. As the size increases, the area to be masked must also be increased, which causes a problem that the visual field for collimation is compressed.
[0008]
Further, as shown in FIG. 7, there is also a problem that the image is not clear because of the aberration of the optical system, particularly the eyepiece, because the masked area is at the end of the field of view.
[0009]
On the other hand, in the optical system in which the transmission type liquid crystal is arranged on the reticle, there is no problem in terms of the data display amount and the influence of aberration. However, since the liquid crystal element is placed on the image plane 13, there is a problem that slight scratches and dust are conspicuous.
[0010]
Further, there is a problem that an image is dark because the transmittance is considerably reduced due to the characteristics of the element.
[0011]
Furthermore, when used in a dark environment, there is a problem that the data on the liquid crystal element is difficult to read because the incident light is dark.
[0012]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a distance measuring apparatus capable of providing a sufficiently large visual field for collimation and displaying data clearly.
[0013]
[Means for Solving the Problems]
In order to solve the above problem, a first aspect of the distance measuring apparatus of the present invention projects distance measuring light onto a target object collimated by a collimating optical system, and receives distance measuring light returned from the object. A distance measuring device that measures a distance to the target object by using the collimating optical system to combine the collimating light and the data display light with a division surface that divides collimating light and the distance measuring light. A first prism having a combining surface; and a second prism that receives the combined light from the first prism and forms an erect image by providing the data display light to the combining surface of the first prism. And a data display optical system.
[0014]
Further, in the first aspect, the first prism further includes three small prisms of a first small prism, a second small prism, and a third small prism joined to each other, and the first small prism and the second small prism are joined to each other. The joint surface between the small prism and the small prism may be the split surface, and the joint surface between the first small prism and the third small prism may be the composite surface.
[0015]
Further, the division surface may transmit invisible light and reflect visible light.
[0016]
Further, the combining surface may transmit one of the collimation light and the data display light and combine the two lights by reflecting the other.
[0017]
The second prism, together with the first prism, constitutes an erecting prism that erects the image of the collimating light as a whole, and the image of the collimating light and the data display light on the reticle. And the image of.
[0018]
Further, in the present invention, the first prism has a first small prism, a second small prism, and a third small prism joined to each other, and a joining surface A between the first small prism and the second small prism. Is a dividing surface, a joining surface B of the first small prism and the third small prism is a composite surface, and the dividing surface reflects the collimating light and transmits the ranging light, The combining surface may transmit the collimation light and reflect the data display light.
[0019]
In this case, the collimated light reflected on the division surface may be totally reflected on the inner side surface of the first small prism, and then may be incident on the synthesis surface.
Alternatively, after the distance measuring light is incident on the second small prism, it is totally reflected on an inner side surface of the second small prism and reaches the division surface, and the data display light is transmitted to the third small prism. After being incident on the third prism, the light may be totally reflected by the inner side surface of the third small prism to reach the combined surface.
[0020]
Further, in the present invention, the first prism has a first small prism, a second small prism, and a third small prism joined to each other, and a joining surface A between the first small prism and the second small prism. Is a dividing surface, a joining surface B of the first small prism and the third small prism is a composite surface, and the dividing surface reflects the collimating light and transmits the ranging light, The combining surface may reflect the collimation light and transmit the data display light.
[0021]
In this case, if the angle .theta.1 between the normal of the dividing plane and the optical axis of the incident collimated light to the splitting surface, satisfies the .theta.1 = 45 ^0, is reflected by the splitting surface, the composite surface and the optical axis of the incident collimated light, the case where the angle .theta.2 between the normal of the synthetic surface, satisfies the .theta.2 = 45 ^0, further second prism may be a rectangular prism .
[Embodiment of the present invention]
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0022]
FIG. 1 is a schematic configuration diagram of a distance measuring apparatus according to a first embodiment of the present invention.
[0023]
The distance measuring apparatus according to the first embodiment of the present invention has a light transmission system, a collimation system, a data display system, a light reception system, and a processing system.
[0024]
The light transmission system includes a measurement light source 5, a relay lens 6, a first prism 100, and a transmission / collimation shared objective lens 10.
[0025]
The first prism 100 has a dividing surface and a combining surface.
The division surface is a joint surface A between the first small prism 1 and the second small prism 2. (Hereinafter, it is referred to as a division plane.)
[0026]
The composite surface is a bonding surface B between the first small prism 1 and the third small prism 3. (Hereafter referred to as a composite surface.)
[0027]
The collimating system includes a transmission / collimation shared objective lens 10, a first prism 100, a second prism 4, an eyepiece 11, and a reticle 12.
[0028]
The data display system has a data display element 7 and an imaging lens 8.
[0029]
The light receiving system includes a receiving objective lens 40, a filter 41, and a light receiving element 42.
[0030]
The processing system includes a signal processing device 50 connected to the measurement light source 5, the data display element 7, and the light receiving element 42.
[0031]
The measurement light source 5 may be a laser diode for invisible light. When the target object is at a long distance, the measurement light source 5 is placed at the focal point of the objective lens 10.
[0032]
When the measurement light source 5 that sends out the distance measuring light is an invisible light source such as a laser diode, the division surface is made of a dichroic film that transmits light in the wavelength band of the distance measuring light and reflects visible light that is collimated light. Form.
[0033]
A half mirror surface is formed on the combining surface. The combining surface combines the collimating light and the data display light from the data display element 7. The ratio of reflection and transmission of the half mirror surface is appropriately selected depending on the brightness of the data display element 7 and the brightness of the collimated object.
[0034]
Although the roof prism is used as the second prism 4, it may be a right-angle prism, and together with the first prism 100, constitutes an erect prism system as a whole.
[0035]
Further, the data display element 7 is configured by, for example, an LED or the like, and is configured so that display / non-display can be operated by a switch.
[0036]
FIG. 2 is an example of a display screen on the reticle, and distance measurement data such as distance information, distance unit information, remaining power amount information, and the like are displayed together with the distance measurement area.
[0037]
The reticle 12 is necessary, for example, when the distance measurement area is printed on the reticle in advance so that the operator can visually recognize the distance measurement area. However, it is not always necessary when only the data of the data display element 7 can be visually recognized.
[0038]
The filter 41 has a characteristic of selectively passing only the wavelength of the ranging light reflected by the target object, and is for improving the SN ratio of the ranging light.
[0039]
Next, the operation of the distance measuring apparatus having the above configuration will be described.
[0040]
It is assumed that the data display element 7 is turned on by the switch.
[0041]
Below this, the distance measuring light emitted from the distance measuring light source 5 according to the instruction of the signal processing device 50 is condensed by the relay lens 6, passes through the second small prism 2, the division surface and the first small prism 1, and Are emitted from the light transmitting / collimating shared objective lens 10 as a parallel light beam toward the target object.
[0042]
The collimated light from the target object is incident on the transmission / collimation shared objective lens 10, is reflected on the split surface, is totally reflected on the inner side surface of the first small prism 1, and is combined with the combined surface and the third small prism 3. And enters the second prism 4.
[0043]
Further, the collimated light is totally reflected a plurality of times in the second prism 4 and then emitted from the second prism 4. Then, an image 13 of the target object is formed on the reticle 12. The observer collimates the target object by observing the image 13 through the eyepiece 11.
[0044]
In FIG. 1, since the second prism 4 is the roof prism, reflection on the roof surface is reflected on the right and left prism surfaces, and the number of reflections on the roof surface is two. Therefore, the total number of reflections in the second prism 4 is four.
[0045]
The distance measuring light reflected by the target object passes through the receiving objective lens 40 and the filter 41 and reaches the light receiving element 42.
[0046]
The signal processing device 50 calculates a distance measurement value to the target object from a time difference between the transmission of the distance measurement light and the reception and reflection of the target object, and displays the distance measurement data on the data display element 7. .
[0047]
The distance measurement data displayed on the data display element 7 passes through the imaging lens 8, is reflected by the combining surface, is combined with the optical axis of the collimating light, passes through the second prism 4, and is on the reticle 12. Is imaged.
[0048]
With the above configuration and operation, the following effects can be obtained.
[0049]
First, since the transmission optical path, the collimation optical path, and the data optical path are integrated in the first prism 100, the entire distance measuring apparatus can be reduced in size as compared with a distance measuring apparatus each including a separate optical system. .
[0050]
Next, since the light from the data display element 7 such as an LED can be seen, the distance information and mode display of the distance measuring device, the remaining power supply display, and the like are displayed brightly and clearly even in a dim environment such as dawn or dusk. Therefore, various information can be obtained comfortably.
[0051]
Further, since the image of the data display light from the data display element 7 is formed so as to be superimposed on the image of the collimation light, it is not necessary to mask a part of the visual field, and a wide visual field can be secured. Further, since the optical axis of the data optical system is made coincident with the optical axis of the collimated light, data can be displayed at the center of the field of view, and a distance measuring apparatus in which there is no risk of image deterioration due to the eyepiece 11 can be obtained.
[0052]
Further, by designing the shapes of the first prism 100 and the second prism 4 and their arrangement so that the decrease in the amount of collimated light is as small as possible, it is possible to keep the visual field at the time of collimation bright. it can.
[0053]
For example, in FIG. 1, when the angle between the normal C of the division surface and the optical axis of the collimating light is θ1, θ1 is
20 ° ≦ θ1 ≦ 30 °
In this range, the shape of the first prism 100 can be reduced in size, and a decrease in the amount of collimated light can be reduced.
[0054]
When θ1 is equal to or larger than the lower limit (20 °) of the condition, when the collimated light reflected on the division surface is reflected again on the side surface of the first small prism 1, the collimation light becomes total reflection, and the loss of the light amount due to the reflection can be reduced.
[0055]
When θ1 is equal to or less than the upper limit (30 °), the reflection point when the collimated light reflected on the division surface is again reflected on the side surface of the first small prism 1 does not drop too low. Therefore, the first small prism 1 can be made smaller.
[0056]
In FIG. 1, when the angle between the normal D of the combined surface and the optical axis of the collimated light is θ2, θ2 is
40 ^o ≤ θ2 ≤ 50 ^o
By setting the range, the shape of the first prism 100 can be further reduced.
[0057]
When θ2 is equal to or larger than the lower limit (40 ^° ) of the condition, the distance between the data optical system and the second prism 4 can be sufficiently set, so that the necessity of increasing the size of the third small prism 3 to avoid interference is further reduced.
[0058]
When θ2 is equal to or less than the upper limit (50 ^° ), the light beam diameter at the exit of the first prism 100 is large, and the possibility that collimated light is emitted is further reduced. Therefore, it is not necessary to enlarge the third small prism 3.
[0059]
FIG. 3 is a schematic configuration diagram of a second embodiment according to the present invention.
[0060]
The distance measuring apparatus according to the second embodiment of the present invention has a light transmission system, a collimation system, a data display system, a light reception system, and a processing system.
[0061]
The light transmission system includes a measurement light source 5, a relay lens 6, a first prism 100, and a transmission / collimation shared objective lens 10.
[0062]
The first prism 100 has a dividing surface and a combining surface.
[0063]
The division surface is a joint surface A between the first small prism 21 and the second small prism 22. (Hereafter referred to as a division plane.)
The composite surface is a joint surface B between the first small prism 21 and the third small prism 23. (Hereafter referred to as the composite surface.)
The collimating system includes a transmission / collimation shared objective lens 10, a first prism 100, a second prism 24, an eyepiece 11, and a reticle 12.
[0064]
The data display system has a data display element 7 and an imaging lens 8.
The light receiving system includes a receiving objective lens 40, a filter 41, and a light receiving element 42.
[0065]
The processing system includes a signal processing device 50 connected to the measurement light source 5, the data display element 7, and the light receiving element 42.
[0066]
Although the second prism 24 is a roof prism, it may be a right-angle prism, and together with the first prism 100, constitutes an erect prism system as a whole.
[0067]
Next, the operation of the distance measuring apparatus having the above configuration will be described.
[0068]
The distance measurement light from the measurement light source 5 is condensed by the relay lens 6, enters the second small prism 22, is totally reflected inside the second small prism 22, and reaches the division surface. The ranging light passes through the splitting surface and the first small prism 21, reaches the transmission / collimation shared objective lens 10, and is emitted from the transmission / collation shared objective lens 10 toward the target object.
[0069]
The collimated light from the target object is condensed by the transmission / collimation shared objective lens 10, enters the first small prism 21, and reaches the division surface. The collimated light that has arrived is reflected by the split surface, and then passes through the first small prism 21 to reach the combined surface. Further, the collimating light passes through the combining surface and the third small prism 23 and enters the second prism 24. The collimated light that has entered is totally reflected a plurality of times in the second prism 24 and then exits from the second prism 24. Then, an image 13 of the target object is formed on the reticle 12. The observer collimates the target object by observing the image 13 through the eyepiece 11. Here, since the second prism 24 is the roof prism, the total number of times of collimation light reflection by the second prism 24 is three times including the reflection on the roof surface.
[0070]
The distance measuring light reflected by the target object passes through the receiving objective lens 40 and the filter 41 and reaches the light receiving element 42.
[0071]
The signal processing device 50 calculates a distance measurement value to the target object based on a time difference from when the distance measurement light is transmitted to when the distance measurement light is reflected and received by the target object, and displays the distance measurement data on the data display element 7. .
[0072]
The distance measurement data displayed on the data display element 7 passes through the imaging lens 8, is reflected by the combining surface, is combined with the optical axis of the collimating light, passes through the second prism 4, and is on the reticle 12. Is imaged.
[0073]
The operation of the second embodiment has been described above.
[0074]
Here, in the second embodiment, the number of times of the collimation light reflection in the first prism 100 in the first embodiment is two, which is one. Further, it is characterized in that the number of times collimated light is reflected by the second prism 24 is smaller by one than in the first embodiment.
[0075]
In the second embodiment shown in FIG. 3, the following conditions may be further added.
[0076]
Assuming that the angle between the normal C of the divided surface and the optical axis of the collimated light is θ1, θ1 is
50 ^o ≤ θ1 ≤ 70 ^o
Within this range, the size of the first prism 100 can be reduced, and loss of light amount can be suppressed.
[0077]
When θ1 is equal to or larger than the lower limit (50 ^° ) of the condition, the diameter of the exit of the second prism 24 can be increased, so that the size of the second prism 24 can be suppressed.
[0078]
When θ1 is equal to or less than the upper limit (70 ^° ), the inclination of the collimating light is small, and the size of the first prism 100 is suppressed.
[0079]
When the angle between the normal D of the composite surface and the optical axis of the collimated light is θ2, θ2 is
20 ^o ≤ θ2 ≤ 40 ^o
Within the range, the first prism 100 can be reduced in size and the loss of the light amount can be suppressed, as in the case of θ1.
[0080]
If θ2 is equal to or ^larger than the lower limit (20 ^° ) of the condition, the data display light from the data optical system is totally reflected when reflected by the third small prism 23, and a decrease in the amount of data display light due to the reflection can be avoided.
[0081]
When θ2 is equal to or less than the upper limit (40 ^° ), the light beam diameter at the entrance of the third small prism 23 is sufficiently large, and the possibility that the data display light is not emitted is low.
[0082]
FIG. 4 is a schematic configuration diagram of a third embodiment according to the present invention.
[0083]
The distance measuring apparatus according to the third embodiment of the present invention has a light transmission system, a collimation system, a data display system, a light reception system, and a processing system.
[0084]
The light transmission system includes a measurement light source 5, a relay lens 6, a first prism 100, and a transmission / collimation shared objective lens 10.
[0085]
The first prism 100 has a dividing surface and a combining surface.
[0086]
The division surface is a joint surface A between the first small prism 31 and the second small prism 32. (Hereafter referred to as a division plane.)
[0087]
The composite surface is a bonding surface B between the first small prism 31 and the third small prism 33. (Hereafter referred to as the composite surface.)
[0088]
The collimating system includes the transmission / collimation shared objective lens 10, the first prism 100, the second prism 34, the eyepiece 11, and the reticle 12.
[0089]
The data display system has a data display element 7 and an imaging lens 8.
[0090]
The light receiving system includes a receiving objective lens 40, a filter 41, and a light receiving element 42.
[0091]
The processing system includes a signal processing device 50 connected to the measurement light source 5, the data display element 7, and the light receiving element 42.
[0092]
Note that the first small prism 31 and the second prism 34 included in the first prism 100 are right-angle prisms.
[0093]
Further, the second prism 34 and the first prism 100 together constitute an erect prism system as a whole.
[0094]
Since a right-angle prism is used as the erecting prism system, the angle between the incident light and the normal line of the split plane and the composite plane is 45 ^° . That is, when the angle of the normal to the reflecting surface is θ1 with respect to the optical axis on the objective lens side as the prism shape,
θ1 = 45 ^o
Is satisfied, and when the angle of the normal to the incident ray on the combined surface when entering the combined surface is θ2,
θ2 = 45 ^o
Meet.
[0095]
Next, the operation of the distance measuring apparatus having the above configuration will be described.
[0096]
The ranging light from the measuring light source 5 is incident on the second small prism 32, passes through the dividing surface and the first prism 31, reaches the objective lens 10, and is emitted from the objective lens 10 toward the target object.
[0097]
On the other hand, the collimated light from the target object is condensed by the objective lens 10 which is shared with the ranging light, enters the first small prism 31, and reaches the division surface. After the collimated light is reflected by the division surface, it further passes through the first small prism 31 and reaches the combined surface. The collimated light reflected on the combining surface passes through the first small prism 31 and enters the second prism 34. After the collimated light is totally reflected twice in the second prism 34, it is emitted from the second prism 34. Then, an image 13 of the target object is formed on the reticle 12. The observer collimates the target object by observing the image 13 through the eyepiece 11.
[0098]
The distance measuring light reflected by the target object passes through the receiving objective lens 40 and the filter 41 and reaches the light receiving element 42.
[0099]
The signal processing device 50 calculates a distance measurement value to the target object from a time difference between the transmission of the distance measurement light and the reception and reflection of the target object, and displays the distance measurement data on the data display element 7. .
[0100]
The distance measurement data displayed on the data display element 7 passes through the imaging lens 8, passes through the combining surface, is combined with the optical axis of the collimating light, passes through the second prism 34, and is on the reticle 12. Is imaged.
[0101]
In the third embodiment, the combining surface reflects the collimation light, transmits the data display light, and combines the transmitted data display light and the reflected collimation light.
[0102]
In the first and second embodiments, the division surface transmits the collimated light, reflects the data display light, and combines the transmitted collimated light with the reflected data display light.
[0103]
The difference in the properties of the divided surfaces is reflected in the difference in the configuration between the first embodiment, the second embodiment, and the third embodiment.
[0104]
In FIG. 4, the data display element 7, the imaging lens 8, the reticle 12, the image 13, and the optical axis of the eyepiece 11 are drawn so as to overlap. However, as shown in FIG. 5, the collimated light incident on the second prism 34 and the collimated light emitted from the second prism 34 are parallel rays that are not coaxial. Therefore, these two axial members do not interfere with each other.
[0105]
Note that the present invention is not limited to the above embodiment. Many modifications are possible within the scope of the gist.
[0106]
For example, in each of the embodiments described above, the objective lens 10 is shared by the transmission optical system and the collimating optical system, and the receiving optical system is a separate optical system. Alternatively, the objective lens 10 may be shared by the receiving optical system and the collimating optical system.
[0107]
【The invention's effect】
As described above in detail, according to the present invention, it is possible to provide a distance measuring apparatus that has a sufficiently large field of view for collimation and that can clearly display data.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a distance measuring apparatus according to a first embodiment of the present invention.
FIG. 2 is an example of a reticle display screen shown in FIG. 1;
FIG. 3 is a configuration diagram of a distance measuring apparatus according to a second embodiment of the present invention.
FIG. 4 is a configuration diagram of a distance measuring apparatus according to a third embodiment of the present invention.
FIG. 5 is a simplified view of the arrangement of the prism and the optical axis shown in FIG. 4;
FIG. 6 is a configuration diagram of a conventional telescope with a data display device.
FIG. 7 is an example of a reticle display screen shown in FIG. 6;
[Description of Signs] 1 ... first small prism, 2 ... second small prism, 3 ... third small prism, 4 ... second prism, 5 ... light source for measurement, 6 ... relay lens, 7 ... data display element, 8 imaging lens, 10 transmission and collimating objective lens, 11 eyepiece, 12 reticle, 13 observation image, 14 right-angle prism, 15 compass, 16 imaging lens, 17 reflecting mirror, 18 mask, 19 data display window, 21 first small prism, 22 second small prism, 23 third small prism, 24 second prism, 31 first small prism, 32 second small prism Prism, 33: third small prism, 34: second prism, 40: receiving objective lens, 41: filter, 42: light receiving element, 50: signal processing device, 100: first prism.

Claims (11)

In a distance measuring device that projects distance measuring light to a target object collimated by a collimating optical system, receives the distance measuring light returned from the target object, and measures a distance to the target object,
In the collimating optical system,
A first prism having a dividing surface that divides collimating light and the distance measuring light, and a combining surface that combines the collimating light and data display light;
A second prism that receives the combined light from the first prism to form an erect image;
A distance measuring device, comprising: a data display optical system that makes the data display light incident on the combining surface of the first prism. The first prism includes three small prisms of a first small prism, a second small prism, and a third small prism joined to each other,
A joining surface between the first small prism and the second small prism is the dividing surface,
The distance measuring apparatus according to claim 1, wherein a joining surface between the first small prism and the third small prism is the combined surface. The distance measuring apparatus according to claim 1, wherein the division surface transmits invisible light and reflects visible light. The combining surface transmits one of the collimation light and the data display light, and combines the two lights by reflecting the other,
The distance measuring apparatus according to claim 1, wherein: The combining surface transmits the collimation light and reflects the data display light,
The collimated light that has entered the first small prism is reflected by the division surface, is totally reflected at least once by an inner side surface of the first small prism, and then is incident on the combining surface. Item 5. The distance measuring device according to Item 4. The distance measuring apparatus according to claim 4, wherein the distance measuring light is totally reflected at least once on an inner side surface different from the division surface in the second small prism. The combining surface transmits the collimating light and reflects the data display light, and the data display light is incident on the combining surface after being totally reflected at least once on the inner side surface of the third small prism. The distance measuring apparatus according to claim 4, wherein: The combining surface reflects the collimating light and transmits the data display light,
The collimated light incident on the division plane satisfies θ1 = 45 ° when an angle between the optical axis and a normal to the division plane is θ1,
The collimated light reflected by the division surface and incident on the synthesis surface satisfies θ2 = 45 ° when an angle between the optical axis and a normal to the synthesis surface is θ2,
The distance measuring apparatus according to claim 4, wherein the second prism is a right-angle prism. Collimating optical means for receiving collimated light from a target object through an objective lens,
Transmission optical means for transmitting distance measurement light to the target object,
Receiving optical means for receiving the distance measurement light reflected from the target object through a light receiving objective lens,
A signal processing unit that calculates a distance measurement value from a time difference from when the distance measurement light is transmitted to when the distance measurement light is reflected and received by the target object,
Data display means for displaying the distance measurement value,
The collimating optical unit includes an objective lens, a first prism and a second prism according to Claims 1 to 8, and an eyepiece,
A distance measuring device, wherein an image of the data display light is superimposed on an image of the collimating light to form an image. The data display device according to claim 9, wherein the objective lens is shared by the transmission optical system and the collimating optical system. The data display device according to claim 9, wherein the objective lens is shared by the receiving optical system and the collimating optical system.

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