Measuring apparatus

Abstract

To provide a measuring apparatus capable of inhibiting a laser beam from being emitted in a direction different from one originally desired.SOLUTION: The measuring apparatus comprises: a laser emission part 50 that is rotatable and irradiates an irradiation object with a laser beam L1; and a plurality of transmission windows 61, 62 through which the laser beam L1 emitted from the laser emission part 50 passes when the laser beam L1 is emitted to the outside. The plurality of transmission windows 61, 62 is arranged so as to form different angles to each other and continuously in a rotation direction of the laser emission part 50. End faces of the plurality of transmission windows 61, 62 adjacent to one another are bonded to one another by adhesive on a bonding surface 63 which can transmit the laser beam L1. The center of rotation CP of the laser emission part 50 is arranged to a bonding position 631 on an inner side of the bonding surface 63 so that the laser beam L1 entering the transmission window 62 and refracted is emitted outward from the transmission window 62 without transmitting through the bonding surface 63 when the laser beam L1 emitted from the laser emission part 50 is directed to the bonding position 631.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a measuring device that allows laser light to pass through a plurality of transmission windows. [Background technology]

[0002] Measuring devices that use laser light have been known for some time, and are used in a variety of situations, such as obtaining spatial position information of an object by receiving reflected light of an emitted laser light, or determining reference planes and reference lines in civil engineering and construction by shining a laser light on an object, etc. In order to expand the measurement range of these measuring devices, for example, a laser emission unit that emits laser light is rotated vertically, and a base part that supports this laser emission unit is rotated horizontally.

[0003] Patent Document 1 describes such a measuring device, which has a laser scanner mounted on a total station. The laser scanner is rotatable vertically around a horizontal axis and has a rotating unit (laser emitting unit) that emits laser light. The base of the laser scanner also rotates horizontally. This allows the laser scanner to emit pulsed laser light over a wide range in both the vertical and horizontal directions, thereby obtaining point cloud data of the light-receiving object and measuring its shape and position. The rotating part that serves as the laser emitting part is covered with a protective case. The protective case has a transmission window made of glass or the like that transmits the laser light, and in order to expand the measurement range, multiple transmission windows are arranged in the rotational direction corresponding to the rotating part that emits the laser light, and the end faces of the windows are joined together.

[0004] Laser light incident on the entrance surface of the transmission window is refracted at the entrance surface and travels through the transmission window, such as glass. Depending on the direction of irradiation, the laser light may pass through the joint surfaces of multiple transmission windows and exit the protective case. In this case, the transmission window from which the laser light exits is positioned at a different angle from the transmission window through which the laser light entered. In this case, the laser light that has passed through the transmission window exits the transmission window in a direction different from the direction in which the laser light entered the transmission window. As a result, the laser light is emitted in a direction different from the direction originally intended. In this respect, the measuring device described in Patent Document 1 has room for improvement. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2021-21678 Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has been made in consideration of the above circumstances, and aims to provide a measuring device that can prevent laser light from being emitted in a direction different from the direction that is originally intended to be indicated. [Means for solving the problem]

[0007] According to the present invention, the above problem is solved by a measuring device comprising: a rotatable laser emitting unit that emits laser light toward an irradiation object; and a plurality of transmission windows through which the laser light emitted from the laser emitting unit passes when it is emitted to the outside, the laser emitting unit having a light emitting element that emits the laser light and an optical member that converts the laser light emitted from the light emitting element into a parallel beam or a beam of light having a desired divergence angle, the plurality of transmission windows have angles different from one another and are arranged successively in a rotation direction of the laser emitting unit, end faces of the plurality of adjacent transmission windows are joined at a joining surface with an adhesive that allows the laser light to pass through, and a center of rotation of the laser emitting unit is arranged relative to the joining position so that when the laser light emitted from the laser emitting unit is directed toward a joining position inside the joining surface, the laser light that has entered and refracted the transmission window is emitted to the outside from the transmission window without passing through the joining surface.

[0008] According to the measuring device of the present invention, the center of rotation of the laser emission unit relative to the joining position inside the joining surface of the multiple transmission windows is positioned so that when laser light emitted from the laser emission unit is directed toward the joining position, the laser light that enters the transmission window and is refracted is emitted to the outside from the transmission window without passing through the joining surface. Therefore, the transmission window from which the laser light is emitted is the same as the transmission window into which the laser light entered. As a result, even when laser light is incident on the joining position, the laser light that passes through the transmission window is emitted from the transmission window in the same direction as the laser light entered the transmission window. This makes it possible for the measuring device of the present invention to prevent the laser light from being emitted in a direction different from the intended direction.

[0009] In the measuring device according to the present invention, the center of rotation of the laser emission part is preferably arranged with respect to the joint position so that the refraction angle of the laser light with respect to the incident surface of the transmission window is smaller than an angle formed by the incident surface and the joint surface minus 90 degrees.

[0010] According to the measuring device of the present invention, the rotation center of the laser emission unit relative to the joining position is positioned so that the refraction angle of the laser light with respect to the incident surface of the transmission window is smaller than the angle between the incident surface and the joining surface minus 90 degrees. Therefore, the transmission window from which the laser light is emitted is more reliably the same as the transmission window into which the laser light entered. As a result, even when the laser light is incident on the joining position, the laser light that passes through the transmission window is more reliably emitted from the transmission window in the same direction as the laser light entered the transmission window. This makes it possible for the measuring device of the present invention to prevent the laser light from being emitted in a direction different from the intended direction.

[0011] In the measuring device according to the present invention, preferably, the laser emission unit is arranged inside a housing of which the transmission window is a part, the transmission window has a front transmission window arranged on the front surface of the housing and a top transmission window arranged on the top surface of the housing, the front transmission window is arranged at an inclination in the horizontal direction so as not to be perpendicular to the optical axis of the laser light that hits the front transmission window, and the top transmission window is arranged at an inclination in the vertical direction so as not to be perpendicular to the optical axis of the laser light that hits the top transmission window.

[0012] According to the measuring device of the present invention, the transmission window formed as part of the housing has a front transmission window and a top transmission window, so that even if the laser emission unit is protected within the housing, the laser light can be emitted from both the front and top sides, making it possible to trace reference points and the like over a wide range, for example, from the front wall to the ceiling of a building. Furthermore, because neither the front transmission window nor the top transmission window is perpendicular to the optical axis of the laser light that strikes them, reflected light that strikes the transmission windows is prevented from returning to the laser emission unit, preventing adverse effects on measurement.

[0013] In the measuring device of the present invention, it is preferable that the housing has a handle with a grip portion located above the top surface and behind the top transmission window, and the top transmission window is gradually inclined downward from the front side to the back side (the side opposite the front transmission window).

[0014] The measuring device according to the present invention can increase the distance between the grip portion of the handle and the upper transmission window, preventing the user's fingers from touching and becoming dirty with the upper transmission window when holding the grip portion, and also preventing the grip portion of the handle from interfering with the laser light emitted upward from the upper transmission window. [Effects of the Invention]

[0015] According to the present invention, it is possible to provide a measuring device that can prevent laser light from being emitted in a direction different from the direction that is originally intended to be pointed. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a schematic front view of a measurement device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a plan view of the measuring device shown in FIG. [Figure 3] FIG. 2 is a schematic cross-sectional view taken along the line AA in FIG. [Figure 4] FIG. 2 is a block diagram showing the configuration of an optical system of the measurement device shown in FIG. [Figure 5] 2 is a perspective view of the front and top sides of the measurement device of FIG. 1. FIG. [Figure 6] 3A and 3B are schematic diagrams illustrating how laser light travels in the measurement device according to the present embodiment. [Figure 7] FIG. 7 is an enlarged view of an area A1 shown in FIG. [Figure 8] 10A and 10B are schematic diagrams illustrating how laser light travels in a measurement device according to a comparative example. [Figure 9] FIG. 9 is an enlarged view of an area A2 shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0017] Preferred embodiments of the present invention will now be described in detail with reference to the drawings. The embodiments described below are preferred examples of the present invention, and therefore various technically preferable limitations are applied thereto, but the scope of the present invention is not limited to these aspects unless otherwise specified in the following description to the effect that the present invention is particularly limited. Furthermore, in each drawing, similar components are designated by the same reference numerals, and detailed descriptions thereof will be omitted as appropriate.

[0018] The measuring device of this embodiment (hereinafter referred to as "the device") 1 includes a "leveling table 4", a "guide light irradiating unit 5", and a "measuring device main body 2". [About the tribrach] First, the leveling base 4 will be described with reference to Figure 1. The leveling base 4 is fixed on a tripod and, in this embodiment, is capable of automatic leveling. That is, the leveling base 4 has multiple leveling screws 4a, and when the leveling screws 4a are rotated by a known program, the upper base part 3 connected to these leveling screws 4a is tilted and horizontal leveling is performed.

[0019] [Guide light irradiation unit] Next, the guide light irradiating unit 5 will be described with reference to FIGS. 1 and 2. The guide light irradiating unit 5 is a unit that irradiates light to guide the worker to the position of the object to be irradiated with the measurement laser light. The guide light irradiating unit 5 of this embodiment has a first irradiating unit 5a and a second irradiating unit 5b. The first irradiating unit 5a and the second irradiating unit 5b irradiate guide lights G and R of different colors and are composed of light-emitting diodes. For example, the first irradiating unit 5a in FIG. 1 irradiates green guide light G to the left side in a plan view as shown in FIG. 2, and the second irradiating unit 5b in FIG. 1 irradiates red guide light R to the right side in a plan view as shown in FIG. 2, with the boundary between the green and red colors coinciding with the optical axis of the laser light L1 emitted toward the irradiation target position. As a result, for example, after aiming in the direction of a reference point to be surveyed (for example, a stakeout point), when the guide lights G and R are shone on the object, the worker will know that the object is shifted to the right of the optical axis if he sees the red light, and that the object is shifted to the left of the optical axis if he sees the green light, and can be guided to a position where the red and green colors appear approximately equal. Then, after the light from the guide light emitting unit 5 has guided the worker to a certain extent to the position of the irradiation target, the laser light emitted from the measuring device main body 2 tracks a target such as a prism held by the worker, and then the position of the measurement target is determined and distance and angle measurement is performed.

[0020] [Regarding the measuring device main body 2] Next, the measurement device main body 2 will be described with reference to Figures 1 and 3. The measurement device main body 2 has a "base part 3," a "support part 10," and a "laser emission part 50." As shown in FIG. 1 , the "base unit 3" is connected to the top of the leveling table 4. The base unit 3 also supports the support unit 10 above it, and rotates the support unit 10 and the laser emission unit 50 supported thereon in a unified manner in the horizontal direction. The base unit 3 in this embodiment has a motor 31 and a drive gear 32 driven by the motor 31. The drive gear 32 engages with a horizontal rotation shaft 33 protruding from the base unit 10, thereby allowing the base unit 10 to rotate freely in the horizontal direction. A horizontal angle detector 35 (encoder, etc.) is provided within the base unit 3 to detect the rotation angle of the horizontal rotation shaft 33, thereby detecting the horizontal rotation angle of the measurement device main body 2.

[0021] The "base frame 10" is U-shaped overall, and serves to rotatably support the laser emission unit 50 inside thereof. The base frame 10 has a drive gear 12 and a motor 14 that drives the drive gear 12. The drive gear 12 meshes with a vertical rotation shaft 16 that is connected to the laser emission unit 50 and can rotate in the vertical direction, thereby allowing the laser emission unit 50 to rotate freely in the vertical direction. The base frame 10 is also provided with a vertical angle detector 18 (encoder or the like) that detects the rotation angle of the vertical rotation shaft 16, thereby detecting the vertical rotation angle of the laser emission unit 50.

[0022] In this way, the rotation shafts 16, 33, the drive gears 12, 32, and the motors 14, 31 work together to orient the laser emission unit 50 in the desired horizontal and vertical directions. The rotation angle detectors 18, 35 can detect the rotation angles of the laser emission unit 50 in the horizontal and vertical directions. A control unit 19 consisting of circuits for controlling the drive motors 14, 31 and the rotation angle detectors 18, 35 is connected to the base unit 10. An example of the control unit 19 is a CPU (Central Processing Unit).

[0023] The "laser emission unit 50" is rotatable and emits laser light toward an irradiation target. In this embodiment, the laser emission unit 50 is connected to the vertical rotation shaft 16 provided on the base unit 10 and rotates vertically together with the vertical rotation shaft 16. As shown in FIGS. 1 and 3 , the laser emission unit 50 has a generally cylindrical or box-like overall shape, with its tip formed as a glass cover body 50a through which the laser light passes, also referred to as a lens barrel. The cover body 50a has an emission point SP, which is the point through which the laser light passes and is emitted toward a transmission window 60 (described below). A straight line connecting the emission point SP and the rotation center axis CP of the vertical rotation shaft 16 spaced from the emission point SP defines the optical axis of the laser light L1 emitted toward the irradiation target.

[0024] The device 1 having the above configuration performs a tracking function, a distance and angle measurement function, and a laser pointer function. These three functions will be explained below mainly with reference to the block diagram in FIG. The tracking function tracks a target TG (irradiation target) such as a retroreflective prism, and a known configuration can be used to achieve this function. Specifically, the laser emission unit 50 includes a light-emitting element 21 such as a laser diode, a light-receiving element 22 that receives reflected light from the irradiated target TG, and a mirror (not shown) and lens 24 for aligning the optical axis of the emitted laser light with the optical axis of the reflected light from the target TG. The mirror (not shown) and lens 24 are examples of the "optical element" of the present invention that converts the laser light emitted from the light-emitting element 21 into a parallel beam or a beam with a desired divergence angle. When the target TG reaches a predetermined position due to this tracking function, the control unit 19 issues an instruction to turn off the guide light G and R from the guide light emission unit 5, and the guide light G and R are no longer emitted. This allows the operator to recognize that the target TG has been locked.

[0025] The distance and angle measurement function measures distance and angle after the target TG is locked. Known components can be used to achieve this function. Specifically, the laser emitter 50 includes a light-emitting element 25, such as a laser diode, that emits a laser beam with a wavelength different from that of the tracking function, a light-receiving element 26 that receives the reflected light from the illuminated target, and a mirror (not shown) and lens 27 for aligning the optical axis of the emitted laser beam with the optical axis of the reflected light from the target TG. The mirror (not shown) and lens 27 are examples of the "optical element" of the present invention that converts the laser beam emitted from the light-emitting element 25 into a parallel beam or a beam with a desired divergence angle. With this configuration, the control unit 19 performs distance and angle measurement using known calculations based on the light-receiving element 26's light-receiving results and the detection results of the horizontal angle detector 35 and vertical angle detector 18.

[0026] The laser pointer function is used to illuminate and trace various reference points or index points on a structure with a laser pointer beam. For example, a laser beam can be emitted vertically from a ground reference point measured using the tracking function and distance and angle measurement function to trace reference points on each floor of the structure (hereinafter referred to as "vertical measurement"). Based on these reference points on each floor, a laser beam can be emitted to the position of a pillar or other object, tracing a pre-stored design drawing on the structure. In this way, this device can be used not only for civil engineering surveying such as stakeout points, but also for construction. A known configuration can be used to perform this laser pointer function. The laser emitter 50 includes a light-emitting element 28 that emits laser light LB with a wavelength different from that of the tracking light-emitting element 21 and the distance and angle measurement light-emitting element 25. The light-emitting element 28 is composed of a laser diode or the like and emits visible light. The laser light LB emitted from the light-emitting element 28 is emitted externally via a known mirror (not shown) or lens 29 so that the optical axis of the laser light from the distance and angle measurement light-emitting element 25 is aligned with that of the laser light. The mirror (not shown) and the lens 29 are examples of the "optical member" of the present invention that converts the laser light emitted from the light emitting element 28 into parallel light or a light beam having a desired divergence angle.

[0027] The tracking function, distance and angle measurement function, and laser pointer function are implemented by the control unit 19 controlling each unit based on various programs stored in the memory unit 40 shown in FIG. 4. Design data for each reference point and the like is also stored in the memory unit 40. Examples of programs include a program for controlling distance and angle measurement operations for the intended position of the target object, a program for calculating distance and angle through distance and angle measurement operations, a program for calculating angles based on horizontal angle data and vertical angle data, a program for performing vertical measurement, a program for controlling the laser pointer light based on the design data, and a program for setting measurement conditions. The memory unit 40 can be implemented using various storage devices, such as a magnetic hard disk, an optical DVD, or a semiconductor memory device such as a RAM, ROM, or memory card.

[0028] The support unit 10, laser emission unit 50, guide light irradiation unit 5, control unit 19, storage unit 40, etc. are housed inside a housing 42, which is a cover for protecting them, as shown in Fig. 1. The housing 42 will be described with reference to Figs. 2 and 5. As shown in these figures, the housing 42 is generally cylindrical overall and has a front surface 42A, a back surface 42B, left and right side surfaces 42C and 42D, and a top surface 42E, covering all four sides and the top. The "front surface" here refers to the side from which the laser light is emitted horizontally during measurement. A handle 53 for lifting the device 1 is located on the top surface 42E side of the housing 42. The handle 53 has a grip portion 53B to be held with the fingers and two support arms 53A, 53A extending from both ends of the grip portion 53B toward the front surface. The support arms 53A, 53A are connected around the boundaries between the top surface 42E and the left and right side surfaces 42C and 42D. The two support arms 53A, 53A are arranged parallel to each other and are inclined upward from the front surface 42A toward the back surface 42B.

[0029] A part of the housing 42 serves as a transmission window 60 through which the laser light emitted from the laser emission unit 50 passes when it is emitted to the outside. The transmission window 60 will be described mainly with reference to FIGS. The transmission window 60 is a light-transmitting member such as transparent glass, and is connected to a through-hole in the housing 42. The transmission window 60 is disposed in the rotation direction RL of the laser emission unit 50 (the vertical rotation direction in this embodiment). This allows the laser emission unit 50 to transmit through the transmission window 60 and emit laser light to the outside. The transmission window 60 has parallel entrance surfaces 61 a, 62 a through which the laser light enters and parallel exit surfaces 61 b, 62 b through which the laser light exits to the outside. The transmission window 60 may be a single sheet, or two or more sheets may be bonded together.

[0030] Here, the transmission window 60 is formed by consecutively arranging a plurality of transmission windows 61 and 62 at different angles in the rotation direction RL of the laser emission unit 50. This angle is an angle relative to the rotation direction of the laser emission unit 50. In this embodiment, since the laser emission unit 50 rotates vertically, the transmission windows 61 and 62 have different angles relative to the vertical direction. As shown in FIG. 5 , the transmission window 61 is a front transmission window arranged on the front surface 42A side (hereinafter referred to as the “front transmission window 61”), and the transmission window 62 is a top transmission window arranged on the top surface 42E side (hereinafter referred to as the “top transmission window 62”). The end face of the front transmission window 61 on the top surface 42E side and the end face of the top transmission window 62 on the front surface 42A side are joined. The reason why the top transmission window 62 is provided next to the front transmission window 61 in this manner is to irradiate a wide range of the laser light from the wall surfaces to the ceiling of the structure when tracing the reference points of the structure or a pre-stored design drawing, as described above.

[0031] As shown in Fig. 3, the front transmission window 61 is elongated and extends vertically, and is inclined toward the rear surface 42B as it moves from the base 3 side toward the top surface 42E. Also, as shown in Fig. 2, the front transmission window 61 is inclined horizontally so as not to be perpendicular to the optical axis of the laser light L1 (see Fig. 3) (i.e., it is horizontally rotated around the vertical axis). This inclination prevents the reflected light of the laser light that strikes the front transmission window 61 from entering the lenses 24, 27 (see Fig. 4) of the laser emission unit 50, thereby preventing adverse effects on measurement. The inclination angle θ1 of the front transmission window 61 in the figure is approximately 10 degrees.

[0032] 3 and 5, the top transmission window 62 extends from the front surface 42A side so that at least the above-mentioned vertical measurement can be performed. That is, as shown by the dashed dotted line in Fig. 3, when the laser emission unit 50 is set up vertically (the cover body 50a is directed directly upward), the top transmission window 62 extends to a position where the emitted laser light can pass through at least the top transmission window 62. Furthermore, the top transmission window 62 slopes downward from the top surface 42E toward the back surface 42B. This downward slope is intended to prevent the top transmission window 62 from coming into contact with the grip portion 53B when gripping it. Note that the handle 53 of this embodiment is located above the top surface 42E and has the grip portion 53B behind the top transmission window 62. Moreover, a long, narrow groove 56 is formed in the top surface 42E from the front surface 42A toward the back surface 42B, and the top transmission window 62 is disposed within this groove 56. In this way, fingers are effectively prevented from coming into contact with the top transmission window 62 when gripping the grip portion 53B.

[0033] The top transmission window 62 is also tilted vertically so as not to be perpendicular to the optical axis of the laser light L1. That is, as shown in FIG. 1, it has a tilt angle θ2 rotated vertically around the horizontal axis. The tilt angle θ1 of the front transmission window 61 in FIG. 1 is the same as the tilt angle θ2 of the top transmission window 62. As a result, as with the front transmission window 61, reflected light of the laser light that hits the top transmission window 62 can be prevented from entering the lenses 24, 27 (see FIG. 4) of the laser emission unit 50, preventing adverse effects on measurement.

[0034] The end face of the front transmission window 61 and the end face of the top transmission window 62 are joined at a joining surface 63 with an adhesive. The laser light L1 can pass through the adhesive. In other words, the adhesive that joins the end face of the front transmission window 61 and the end face of the top transmission window 62 is made of a material that can transmit the laser light L1.

[0035] Depending on the direction of irradiation of the laser light L1, the laser light L1 may pass through the joint surface 63 between the front transmission window 61 and the top transmission window 62 and be emitted to the outside of the housing 42. In this case, the laser light L1 may be emitted in a direction different from the direction that is originally intended to be pointed. This point will be described in detail with reference to FIGS. 6 to 9.

[0036] 8 and 9, a comparative example will be described in which the laser light L1 passes through the joint surface 63 between the front transmission window 61 and the top transmission window 62. Fig. 9 is an enlarged view of an area A2 shown in Fig. 8.

[0037] 8 and 9, the laser light L1 incident on the incident surface 61a of the front transmission window 61 or the incident surface 62a of the top transmission window 62 is refracted at the incident surface 61a or the incident surface 62a and travels through a transmission window such as glass as a refracted ray Re. When the laser light L1 emitted from the laser emission unit 50 is directed toward a bonding position 631 inside the bonding surface 63, the laser light L1 may pass through the bonding surface 63 as a refracted ray Re and be emitted to the outside of the housing 42. FIGS. 8 and 9 illustrate a case in which the laser light L1 is incident on the incident surface 62a of the top transmission window 62 near the bonding position 631, is refracted at the incident surface 62a, passes through the bonding surface 63, and is emitted to the outside of the housing 42 from the exit surface 61b of the front transmission window 61.

[0038] In this case, the transmission window through which the laser light L1 is emitted is a transmission window that is disposed at a different angle from the transmission window through which the laser light L1 is incident. In the comparative example shown in FIGS. 8 and 9, the transmission window through which the laser light L1 is emitted is the front transmission window 61 that is disposed at a different angle from the top transmission window 62 through which the laser light L1 is incident. In this case, the laser light L1 that has passed through the top transmission window 62 and the front transmission window 61 is emitted from the front transmission window 61 in a direction that is different from the direction through which the laser light L1 is incident on the top transmission window 62. As a result, the laser light L1 is emitted in a direction that is different from the direction that is originally desired to be pointed.

[0039] In contrast to this, how the laser light L1 travels in the device 1 according to this embodiment will be described with reference to Figures 6 and 7. Figure 7 is an enlarged view of area A1 shown in Figure 6.

[0040] 6 and 7, in the device 1 according to this embodiment, the rotation center axis CP of the laser emission unit 50 is positioned relative to the bonding position 631 so that when the laser light L1 emitted from the laser emission unit 50 is directed toward the bonding position 631 inside the bonding surface 63, the laser light L1 that is incident on either the entrance surface 62a of the top transmission window 62 or the entrance surface 61a of the front transmission window 61 and refracted thereon is emitted to the outside from the entrance surface of the same transmission window as the incident window (i.e., either the exit surface 62b of the top transmission window 62 or the exit surface 61b of the front transmission window 61) without passing through the bonding surface 63. The rotation center axis CP in this embodiment is an example of the "center of rotation" in the present invention.

[0041] More specifically, the rotation center axis CP of the laser emission unit 50 is positioned relative to the bonding position 631 so as to satisfy the following conditional expression when the laser beam L1 emitted from the laser emission unit 50 is directed toward the bonding position 631 inside the bonding surface 63. Note that in the description of this embodiment, as shown in FIGS. 6 and 7, a case will be taken as an example in which the laser beam L1 emitted from the laser emission unit 50 is incident on the incident surface 62a of the top transmission window 62 when directed toward the bonding position 631 inside the bonding surface 63. [Conditional Expression] β<θ3-90° Equation (1) β: Refraction angle of the laser light L1 with respect to the incident surface 62a of the upper transmission window 62 θ3: Angle between the incident surface 62a of the upper transmission window 62 and the bonding surface 63

[0042] The refraction angle β is given by the following equation according to Snell's law: β=a sin(sinα / n) Equation (2) α: the incident angle of the laser light L1 with respect to the incident surface 62a of the upper transmission window 62 n: refractive index of the upper transmission window 62

[0043] Thus, in the device 1 according to this embodiment, the rotation center axis CP of the laser emission section 50 is positioned relative to the joining position 631 so that the refraction angle β of the laser light L1 relative to the incident surface 62a of the upper surface transmission window 62 is smaller than the angle θ3 between the incident surface 62a and the joining surface 63 minus 90 degrees.

[0044] According to the device 1 of this embodiment, the transmission window 60 through which the laser light L1 is emitted is the same as the transmission window 60 through which the laser light L1 is incident. In the example described with reference to FIGS. 6 and 7, the top transmission window 62 through which the laser light L1 is emitted is the same as the top transmission window 62 through which the laser light L1 is incident. As a result, even when the laser light L1 is incident on the bonding position 631, the laser light L1 that passes through the transmission window 60 is emitted from the transmission window 60 in the same direction as the direction in which the laser light L1 entered the transmission window 60. In the example described with reference to FIGS. 6 and 7, the laser light L1 is emitted from the exit surface 62b of the top transmission window 62 in the same direction as the direction in which the laser light L1 entered the entrance surface 62a of the top transmission window 62. This makes it possible for the device 1 of this embodiment to prevent the laser light L1 from being emitted in a direction different from the intended direction.

[0045] Furthermore, the rotation center axis CP of the laser emission unit 50 is disposed relative to the bonding position 631 so that when the laser beam L1 emitted from the laser emission unit 50 is directed toward the bonding position 631 inside the bonding surface 63, the above-described formulas (1) and (2) are satisfied. Therefore, the transmission window 60 from which the laser beam L1 is emitted is more reliably the same as the transmission window 60 into which the laser beam L1 is incident. As a result, even when the laser beam L1 is incident on the bonding position 631, the laser beam L1 that transmits through the transmission window 60 is more reliably emitted from the transmission window 60 in the same direction as the direction in which the laser beam L1 entered the transmission window 60. This makes it possible for the device 1 according to the present invention to prevent the laser beam L1 from being emitted in a direction different from the direction that the laser beam L1 is originally intended to point.

[0046] Furthermore, since the transmission window 60 formed as part of the housing 42 has a front transmission window 61 and a top transmission window 62, the laser light L1 can be emitted from both the front and top sides even if the laser emission unit 50 is protected within the housing 42, and reference points and the like can be traced over a wide range, for example, from the front wall to the ceiling of a building. Furthermore, since neither the front transmission window 61 nor the top transmission window 62 is orthogonal to the optical axis of the laser light L1 that strikes them, reflected light that strikes the transmission window 60 is prevented from returning to the laser emission unit 50, preventing adverse effects on measurement.

[0047] Furthermore, by increasing the distance between the grip portion 53B of the handle 53 and the upper transmission window 62, it is possible to prevent the user's fingers from touching and becoming dirty with the upper transmission window 62 when holding the grip portion 53B. It is also possible to prevent the grip portion 53B of the handle 53 from interfering with the laser light L1 emitted upward from the upper transmission window 62.

[0048] The above describes the embodiments of the present invention. However, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the claims. The configurations of the above embodiments can be partially omitted or arbitrarily combined in a different manner from the above. [Explanation of symbols]

[0049] 1: This device, 2: Measuring device main body, 3: Base, 4: Leveling table, 4a: Leveling screw, 5: Guide light emitting unit, 5a: First emitting unit, 5b: Second emitting unit, 10: Support unit, 12: Drive gear, 14: Motor, 16: Vertical rotation shaft, 18: Vertical angle detector, 19: Control unit, 21: Light emitting element, 22: Light receiving element, 24: Lens, 25: Light emitting element, 26: Light receiving element, 27: Lens, 28: Light emitting element, 29: Lens, 31: Motor, 32: Drive gear, 33: Horizontal rotation shaft, 35: Horizontal angle detector, 40: Memory unit, 42: Housing, 42A: Front, 42B: Rear, 42C: Left and right side faces, 42D: Left and right side faces, 42E: Top, 50: laser emission part, 50a: cover body, 53: handle, 53A: support arm part, 53B: grip part, 56: groove part, 60: transmission window, 61: front transmission window, 61a: incident surface, 61b: emission surface, 62: upper transmission window, 62a: incident surface, 62b: emission surface, 63: joint surface, 631: joint position, CP: rotation center axis, G: guide light, L1: laser light, LB: laser light, R: guide light, RL: rotation direction, Re: refracted light ray, SP: emission point, TG: target

Claims

1. a rotatable laser emission unit that emits laser light toward an irradiation object; a plurality of transmission windows through which the laser light emitted from the laser emission unit passes when it is emitted to the outside; Equipped with the laser emission unit includes a light emitting element that emits the laser light, and an optical member that converts the laser light emitted from the light emitting element into a parallel beam or a beam having a desired divergence angle, the plurality of transmission windows are arranged at different angles from one another and are successively arranged in a rotation direction of the laser emission part, adjacent end faces of the plurality of transmission windows are joined at joining surfaces with an adhesive that allows the laser light to pass through; a rotation center of the laser emission unit is positioned relative to the joining position so that, when the laser light emitted from the laser emission unit is directed toward the joining position inside the joining surface, the laser light enters the transmission window, is refracted, and is emitted to the outside from the transmission window without passing through the joining surface.

2. 2. The measuring device according to claim 1, wherein the rotation center of the laser emission unit is disposed with respect to the joint position so that a refraction angle of the laser light with respect to the incident surface of the transmission window is smaller than an angle formed between the incident surface and the joint surface minus 90 degrees.

3. the laser emission unit is disposed inside a housing of which the transmission window is a part, the transmission window includes a front transmission window disposed on a front surface of the housing and an upper transmission window disposed on an upper surface of the housing, the front transmission window is disposed at an incline in the horizontal direction so as not to be perpendicular to an optical axis of the laser light incident on the front transmission window, 2. The measuring device according to claim 1, wherein the upper transmission window is disposed at an inclination in the vertical direction so as not to be perpendicular to the optical axis of the laser light impinging on the upper transmission window.

4. the housing has a handle with a grip portion provided above the top surface and behind the top surface transmission window, 4. The measuring device according to claim 3, wherein the upper transmission window is gradually inclined downward from the front side to the rear side.

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