Laser level

Abstract

To provide a laser marker capable of improving the reliability of a locking mechanism for locking an optical main body.SOLUTION: A laser marker 1 includes an optical main body 5, a housing 4, and a locking mechanism 90. The optical main body 5 has a semiconductor laser and optical system. The housing 4 houses the optical main body 5 in a state suspended so as to swing on a predetermined axis. The locking mechanism 90 prohibits the optical main body 5 from rocking. The locking mechanism 90 has a pusher 91. The pusher 91 fixes a part of the optical main body 5 towards the inner peripheral surface 4b of the housing 4 by causing a linear movement without rotation.SELECTED DRAWING: Figure 10

Description

Technical Field

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[0001] The present disclosure relates to a laser inkjet printer. More specifically, the present disclosure relates to a laser inkjet printer in which an optical body is housed in a housing in a state of being swingably suspended about a predetermined axis.

Background Art

[0002] The laser inkjet device (laser inkjet printer) described in Patent Document 1 includes a housing portion (housing) and an optical portion (optical body). The optical portion is vertically attached inside the housing portion by a gimbal mechanism.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] The laser leveling device described herein has the effect of improving the reliability of the locking mechanism that locks the optical body. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a perspective view of the laser level of this embodiment with the legs extended. [Figure 2] Figure 2 is a perspective view of the laser level shown above with its legs closed. [Figure 3] Figure 3 is a cross-sectional view taken along line III-III in Figure 2. [Figure 4] Figure 4 is a perspective view of the optical body of the laser level shown above. [Figure 5] Figure 5 is a perspective view of the internal configuration of the optical unit shown above. [Figure 6] Figure 6 is a cross-sectional view of the locking mechanism from inside the laser level shown above. [Figure 7] Figure 7 is a perspective view of the locking mechanism of the laser level shown above, seen from the outside. [Figure 8] Figure 8 is a perspective view showing the locking mechanism described above with the knob rotated in the second direction. [Figure 9] Figure 9 is a perspective view showing the locking mechanism described above with the knob rotated in the first direction. [Figure 10] Figure 10 is a cross-sectional view showing the state in which the locking mechanism described above prevents the optical body from swinging. [Figure 11] Figure 11 is a cross-sectional view taken along the line XI-XI in Figure 10. [Figure 12] Figure 12 is a cross-sectional view showing the state in which the locking mechanism allows the optical body to swing. [Figure 13] Figure 13 is a cross-sectional view taken along the line XIII-XIII in Figure 12. [Figure 14] Figure 14A is a cross-sectional view showing the state in which the locking mechanism of Modified Example 1 prevents the movement of the optical body. Figure 14B is a cross-sectional view showing the state in which the locking mechanism of Modified Example 1 allows the movement of the optical body. [Figure 15] Figure 15A is a cross-sectional view showing the state in which the locking mechanism of Modified Example 2 prevents the movement of the optical body. Figure 15B is a cross-sectional view showing the state in which the locking mechanism of Modified Example 2 allows the movement of the optical body. [Figure 16] Figure 16A is a cross-sectional view showing the state in which the locking mechanism of Modified Example 3 prevents the movement of the optical body. Figure 16B is a cross-sectional view showing the state in which the locking mechanism of Modified Example 3 allows the movement of the optical body. [Figure 17] Figure 17A is a cross-sectional view showing the state in which the locking mechanism of Modified Example 4 prevents the movement of the optical body. Figure 17B is a cross-sectional view showing the state in which the locking mechanism of Modified Example 4 allows the movement of the optical body. [Modes for carrying out the invention]

[0009] The laser leveling device according to the embodiments of this disclosure will be described below with reference to the drawings. The configuration described in the embodiments below is merely one example of this disclosure. This disclosure is not limited to the embodiments below, and various modifications are possible depending on the design, etc., as long as they do not depart from the technical idea of ​​this disclosure.

[0010] (1) Overview First, the outline of the laser marking device 1 according to the present embodiment will be described with reference to FIGS. 1 and 2. Hereinafter, the up, down, left, right, front, and back (the up, down, left, right, front, and back in FIG. 1) of the laser marking device 1 in a state where it is installed on a horizontal installation surface will be described as the up, down, left, right, front, and back of the laser marking device 1.

[0011] As shown in FIG. 1, the laser marking device 1 has a plurality (for example, three) of legs 3, and is arranged and used on an installation surface such as the ground or floor surface of a work site (for example, a housing construction site and an electrical work site) with the plurality of legs 3 opened. The laser marking device 1 emits, as laser light, a point light L1 which is a point-shaped light, a fan-shaped horizontal line light L2 that spreads in the horizontal direction, and a fan-shaped vertical line light L3 that spreads in the vertical direction in a state where it is installed on the installation surface of the work site. The point light L1 is emitted vertically upward, the horizontal line light L2 is emitted in the forward horizontal direction, and the vertical line light L3 is emitted in the forward vertical direction. Such point light L1, horizontal line light L2, and vertical line light L3 are used as reference points and reference lines to be attached to wall surfaces and ceiling surfaces during work at the work site (for example, housing construction and electrical work). Hereinafter, the point light L1, horizontal line light L2, and vertical line light L3 may be collectively referred to as laser lights L1 to L3.

[0012] Also, as shown in FIG. 2, the laser marking device 1 can be easily carried by closing the plurality of legs 3 to form a rod shape. When distinguishing the plurality of legs 3, they will be described as legs 3a, 3b, 3c.

[0013] (2) Configuration description​​​​​​​​​The housing 4 houses the optical unit 5, the support member 6, and the detection mechanism 7, and is connected to a plurality of legs 3. The housing 4 comprises a body 8 and a base 9.

[0016] Body 8 houses the optical body 5, the support member 6, and the detection mechanism 7. Body 8 is made of, for example, a light-shielding resin. Body 8 is, for example, substantially cylindrical and comprises a peripheral wall portion 81, an upper wall portion 82, and a bottom portion 83 (see Figure 3). The peripheral wall portion 81 is cylindrical (for example). The upper wall portion 82 is provided on the peripheral wall portion 81 so as to close the upper opening of the peripheral wall portion 81, and is, for example, plate-shaped (for example, disc-shaped). The bottom portion 83 is provided on the peripheral wall portion 81 so as to close the lower opening of the peripheral wall portion 81, and is, for example, plate-shaped (for example, disc-shaped). The outer diameter of the lower part 8d of body 8 is smaller than the outer diameter of the upper part 8u of body 8 (i.e., the portion above the lower part 8d). The base portion 9 is fixed to the lower part 8d of body 8.

[0017] The body 8 has three transmissive windows (first to third transmissive windows 8a to 8c) (see Figure 1). The first transmissive window 8a is a transmissive window from which point light L1 is emitted. The first transmissive window 8a is, for example, a substantially circular transmissive window and is provided in the center of the upper wall portion 82 of the body 8. The second transmissive window 8b is a transmissive window from which horizontal line light L2 is emitted. The second transmissive window 8b is, for example, a horizontally elongated rectangular transmissive window and is provided in the peripheral wall portion 81 of the body 8. The third transmissive window 8c is a transmissive window from which vertical line light L3 is emitted. The third transmissive window 8c is, for example, a vertically elongated rectangular transmissive window and is provided spanning the upper wall portion 82 and the peripheral wall portion 81 of the body 8. The three transmissive windows 8a to 8c are formed of a transparent material (resin or glass).

[0018] The base 9 is a member fixed to the lower part 8d of the body 8, and is a member to which multiple leg portions 3 are rotatably connected (see Figure 1). The base 9 is made of, for example, a light-shielding resin. The base 9 is cylindrical (for example, cylindrical) with an open upper end and a bottom. The base 9 is fixed to the body 8 by inserting and fixing the lower part 8d of the body 8 into the upper opening of the base 9 (see Figure 3).

[0019] As shown in Figures 4 and 5, the optical unit 5 generates and emits laser beams L1 to L3. The optical unit 5 comprises a case 51, a semiconductor laser 52, an optical system 53, a holder 54, and a vertical support section 55.

[0020] The semiconductor laser 52 is, for example, a laser diode, and emits laser light L0, which is the source of laser light L1 to L3, into the optical system 53. The semiconductor laser 52 is mounted (placed) on the substrate 56.

[0021] The holder 54 positions and holds the semiconductor laser 52 below the optical system 53 (more specifically below the vertical support portion 55).

[0022] The optical system 53 is positioned above the semiconductor laser 52 (more specifically above the vertical support 55). As shown in Figure 5, the optical system 53 generates laser beams L1 to L3 from the laser beam L0 from the semiconductor laser 52. The optical system 53 includes a first beam splitter 53a, a second beam splitter 53b, a first output lens 53d, and a second output lens 53e. The first beam splitter 53a transmits a portion of the laser beam L0 from the semiconductor laser 52 to the second beam splitter 53b, and reflects the remainder to the first output lens 53d. The first output lens 53d converts the laser beam L0 from the first beam splitter 53a into horizontal line light L2 and outputs it. The second beam splitter 53b transmits a portion of the laser light L0 from the first beam splitter 53a as a point beam L1 and emits it vertically (upward), while reflecting the remaining portion and directing it into the second emission lens 53e. The second emission lens 53e converts the laser light L0 from the second beam splitter 53b into a vertical line beam L3 and emits it.

[0023] As shown in Figure 3, the vertical support section 55 is supported by the support member 6 of the device body 2 so as to be able to swing around the first axis 55a and so as to be able to swing the case 51 of the optical body 5 around the second axis 55b (see Figure 4), so as to allow the case 51 to hang vertically. As a result, the optical body 5 can always hang vertically regardless of the inclination of the device body 2. This allows the optical body 5 to always emit laser beams L1 to L3 in the correct directions (vertically upward, forward horizontal, and forward vertical).

[0024] As shown in Figure 5, the vertical support portion 55 is positioned, for example, between the holder 54 and the optical system 53. The vertical support portion 55 has a base portion 55c, a pair of first shaft portions 55a, and a pair of second shaft portions 55b. The base portion 55c is, for example, substantially rectangular parallelepiped. The base portion 55c has a through hole 55d through which laser light L0 from the semiconductor laser 52 is transmitted in the vertical direction. The pair of first shaft portions 55a protrude in the front-rear direction from both the front and rear sides of the base portion 55c. The pair of first shaft portions 55a protrude to the outside of the case 51 from a pair of openings 51a (see Figure 4) of the case 51 and are rotatably supported by the support member 6 on a pair of bearings 6a of the support member 6 (see Figure 3). The pair of second shaft portions 55b protrude in the left-right direction from both the left and right sides of the base portion 55c and are rotatably supported by a pair of bearings 51b (see Figure 4) of the case 51. The axial direction (front-to-back direction) of the first shaft portion 55a and the axial direction (left-to-right direction) of the second shaft portion 55b are perpendicular to each other.

[0025] As shown in Figures 4 and 5, case 51 houses a semiconductor laser 52, an optical system 53, a holder 54, and a vertical support 55. Case 51 is, for example, a vertically elongated rod shape with an inclined top surface 51u. The optical system 53 is located at the top of case 51. The vertical support 55 is located below the optical system 53 inside case 51. The semiconductor laser 52 is located below the vertical support 55 inside case 51, via the holder 54.

[0026] Case 51 has three window sections (first to third window sections 51c to 51e). The first window section 51c is a window section from which point light L1 is emitted and is provided on the upper surface 51u of case 51. The second window section 51d is a window section from which horizontal line light L2 is emitted and is provided on the side surface 51s of case 51. The side surface 51s is the side surface opposite the inclined upper surface 51u. The third window section 51e is a window section from which vertical line light L3 is emitted and is provided on the side surface 51s of case 51.

[0027] As shown in Figure 3, the support member 6 is fixed to the inner circumferential surface of the body 8 and rotatably supports a pair of first shaft portions 55a of the vertical support portion 55. The support member 6 has an annular portion 6b with a central opening and a pair of bearings 6a. The annular portion 6b is fixed to the inner circumferential surface of the body 8. The pair of bearings 6a are components that rotatably support a pair of first shaft portions 55a of the optical body 5 and are fixed to the annular portion 6b. With the optical body 5 swingably inserted into the central opening of the annular portion 6b and hanging down, the pair of first shaft portions 55a of the optical body 5 are rotatably supported by the pair of bearings 6a. In this way, the support member 6 supports the optical body 5 so that it swings down around the first shaft portions 55a.

[0028] As shown in Figure 3, the detection mechanism 7 detects whether the lower end portion 5d of the optical body 5 is in contact with the inner circumferential surface 8e of the body 8. The detection mechanism 7 has a first contact portion 71 and a second contact portion 72. The first contact portion 71 is a metal part (for example, a cylindrical part) and is fixed to the lower end portion 5d of the optical body 5. The second contact portion 72 is a metal annular part (for example, a cylindrical part with a bottom). The second contact portion 72 is located at the bottom of the body 8. In this arrangement, the second contact portion 72 is positioned to surround the outer circumference of the first contact portion 71 which is fixed to the lower end portion 5d of the optical body 5. As a result, when the lower end portion 5d of the optical body 5 comes into contact with the inner circumferential surface 8e of the body 8, the first contact portion 71 and the second contact portion 72 make electrical contact with each other. In this embodiment, a predetermined detection circuit of the laser level 1 detects this electrical contact. When the predetermined detection circuit detects the aforementioned electrical contact, it stops the emission of light from the semiconductor laser 52 inside the optical body 5.

[0029] In other words, if the lower end portion 5d of the optical body 5 comes into contact with the inner circumferential surface 8e of the body 8, the optical body 5 will no longer be able to hang down accurately in the vertical direction. In this embodiment, in such a case, the emission of light from the semiconductor laser 52 inside the optical body 5 is stopped. For this reason, in this embodiment, a detection mechanism 7 is used to detect whether or not the lower end portion 5d of the optical body 5 comes into contact with the inner circumferential surface 8e of the body 8, and a predetermined detection circuit stops the emission of light from the semiconductor laser 52 inside the optical body 5 based on the detection result of the detection mechanism 7.

[0030] As shown in Figure 1, the base 9 is a member fixed to the lower part 8d of the body 8 (see Figure 3), and is a member to which a plurality of legs 3 are rotatably connected. The base 9 is, for example, cylindrical with an open upper end and a bottom at the lower end. The base 9 is fixed to the lower part 8d of the body 8 by being inserted into and fixed inside the base 9 (see Figure 3). A plurality of legs 3 are rotatably connected to the periphery of the lower surface 9a of the bottom of the base 9. The plurality of legs 3 are connected to the periphery of the lower surface 9a of the bottom of the base 9 so as to be rotatable between the direction of the centerline M1 of the base 9 (i.e., the housing 4) and the direction of the inclined line M2, with respect to their upper ends (connecting parts) 32. The centerline M1 is the direction parallel to the centerline M1 of the base 9 (i.e., the housing 4). The direction of the inclined line M2 is the direction of the inclined line M2 that is inclined toward the outer circumference of the base 9 with respect to the centerline M1 of the base 9.

[0031] As shown in Figure 1, the multiple (for example, three) legs 3 are members for supporting the device body 2 on the installation surface. As described above, the upper ends (connecting parts) 32 of the multiple legs 3 are rotatably connected to the periphery of the lower surface 9a of the base 9. This allows the multiple legs 3 to be in an open state and a closed state. When the multiple legs 3 are in an open state, the laser level 1 can be positioned upright by placing the lower ends of the multiple legs 3 on the installation surface. When the multiple legs 3 are in a closed state, the multiple legs 3 are bundled together and extend along the centerline M1 direction of the device body 2, and the overall shape of the laser level 1 becomes a straight rod shape (see Figure 2).

[0032] As shown in Figures 1 and 2, the multiple leg sections 3 are composed of multiple segments obtained by dividing a cylindrical body (e.g., a cylindrical body) into multiple segments (the same number as the number of legs) in the circumferential direction. One of the multiple leg sections 3 (a leg section with a power supply) 3a further has a power supply case 33. The power supply case 33 houses a power supply (e.g., a dry cell) for emitting and controlling the semiconductor laser 52. The power supply case 33 of the leg section with a power supply 3a is fixed to the inner main surface of the segment. When the multiple leg sections 3 are closed, the power supply case 33 of the leg section with a power supply 3a is housed inside the cylindrical body composed of the multiple leg sections 3 (see Figure 2).

[0033] The locking mechanism 90 is a mechanism for preventing the optical body 5 from swinging due to user operation, and as shown in Figures 6 and 7, it is inserted into a hole 93 in the housing 4. When the laser level 1 is being carried, as shown in Figure 10, the locking mechanism 90 is pushed into the housing 4. As a result, the locking mechanism 90 fixes the lower part of the optical body 5 against the inner circumferential surface 4b of the housing 4, thereby preventing the optical body 5 from swinging. When the laser level 1 is in use, as shown in Figure 12, the locking mechanism 90 is pulled out from the housing 4 and the lock is released. This allows the optical body 5 to swing.

[0034] (3) Configuration of the locking mechanism 90 As shown in Figures 6 and 7, the locking mechanism 90 comprises a pusher 91 and a knob 92. The housing 4 comprises a hole 93 and a projection 94.

[0035] As shown in Figures 7 and 10, the hole 93 is provided at a predetermined location (e.g., the lower part) of the housing 4, penetrating both the inside and outside of the housing 4. The hole 93 is, for example, rectangular cylindrical. The inner circumferential surface of the hole 93 has a top surface, a bottom surface, and both side surfaces. As shown in Figure 11, the inner circumferential surface (e.g., both side surfaces) of the hole 93 is provided with a first protrusion 95 at the edge on the inside side of the housing 4. The first protrusion 95 protrudes convexly (e.g., in a trapezoidal shape) from both side surfaces of the hole 93. The first protrusion 95 (more specifically, the corner 95a on the inside side of the housing 4 of the first protrusion 95) functions as a first engaging portion that engages with the second engaging portion (i.e., the second protrusion 91d) of the plunger 91, which will be described later. The first protrusion 95 also functions as a second engaging portion that fits with the recess 91e of the plunger 91, which will be described later.

[0036] As shown in Figure 7, the projection 94 is provided so as to protrude outward from the housing 4 at a predetermined location on the outer peripheral surface 4a of the housing 4. The projection 94 is the part that fixes the knob 92 by fitting into the fitting hole 92c of the knob 92, which will be described later. The projection 94 is, for example, cylindrical in shape.

[0037] The plunger 91 is a component that pushes the lower part of the optical body 5 laterally, thereby bringing the lower part of the optical body 5 closer to the inner surface 4b of the housing 4 and fixing it in place (see Figure 10). In other words, the plunger 91 fixes the lower part of the optical body 5 by sandwiching it between the inner surface 4b of the housing 4 and the lower part of the optical body 5. The lower part of the optical body 5 is the part of the optical body 5 below the vertical support portion 55. The plunger 91 is inserted into the hole 93 of the housing 4 so as to be able to move linearly along the hole 93.

[0038] More specifically, the plunger 91 is linearly movable along the hole 93 between a first position and a second position. Here, the first position is a position that allows the optical body 5 to swing (i.e., a position that does not interfere with the swing of the optical body 5), and is a position in which the plunger 91 is housed within the hole 93 and does not protrude into the interior of the housing 4 (the position of the plunger 91 shown in Figure 12). The second position is a position in which the plunger 91 protrudes into the interior of the housing 4, and prevents the swing of the optical body 5 by fixing a part of the optical body 5 (e.g., part T1) against the inner circumferential surface 4b of the housing 4 (the position of the plunger 91 shown in Figure 10).

[0039] The plunger 91 is, for example, flat, as shown in Figures 8 and 9. The plunger 91 has a base portion 91a, an arm portion 91b, a connecting portion 91c, a second convex portion 91d, a concave portion 91e, and a locking portion 91k.

[0040] The base portion 91a is, for example, flat. The end portion 91f of the base portion 91a on the inside side (optical body 5 side) of the housing 4 is the part that pushes the lower part of the optical body 5 in the lateral direction. The end portion 91f of the base portion 91a is curved in a concave shape along the lateral width direction D1 of the base portion 91a so as to fit into the outer peripheral surface of the lower part of the optical body 5.

[0041] The arms 91b are provided at both ends of the base 91a in the lateral width direction D1 at the end 7f of the base 91a. The arms 91b protrude outward from the housing 4 (opposite side from the optical body 5) along the linear movement direction of the plunger 91. The arms 91b are flexible. A gap 91h is maintained between the arms 91b and the base 91a in the lateral width direction D1 of the base 91a. This allows the arms 91b to bend toward the base 91a (i.e., toward the inside of the plunger 91). The arms 91b are arranged on both sides of the base 91a in the lateral width direction D1.

[0042] The second protrusion 91d protrudes convexly (for example, in a trapezoidal shape) on the tip side of the outer side surface of the arm portion 91b (opposite side from the optical body 5 side). The second protrusion 91d (more specifically, the corner portion 91i of the second protrusion 91d opposite to the optical body 5 side (inside the housing 4 side)) functions as a second engaging portion that engages with the first protrusion 95 of the hole portion 93 (more specifically, the corner portion 95a (first engaging portion)). When the plunger 91 is in the second position, the second protrusion 91d (i.e., the second engaging portion) engages with the corner portion 95a (first engaging portion) of the first protrusion 95, thereby restricting the movement of the plunger 91 toward the first position (see Figure 11).

[0043] The recess 91e is provided adjacent to the optical body 5 side (inside the housing 4) of the second protrusion 91d on the outer side surface of the arm portion 91b. The recess 91e functions as a second fitting portion that fits with the first protrusion 95 (first fitting portion) of the hole portion 93. When the plunger 91 is in the first position, the recess 91e (i.e., the second fitting portion) fits with the first protrusion 95 (i.e., the first fitting portion), thereby restricting the movement of the plunger 91 to the second position side and the side opposite to the second position side (see Figure 13).

[0044] The second protrusion 91d and recess 91e are provided on the outer side surfaces of each of the two arm portions 91b.

[0045] The connecting portion 91c is the part to which the knob portion 92 is rotatably connected around the rotation axis Q1. The rotation axis Q1 is an axis parallel to the lateral width direction D1 of the base portion 91a. The connecting portion 91c is provided at the end portion 91j of the base portion 91a on the external side of the housing 4 (opposite side from the optical body 5 side), so as to protrude outwards from the housing 4.

[0046] The locking portion 91k is provided so as to protrude downward from the inner edge (optical body 5 side) of the housing 4 on the lower surface of the base portion 91a. When the plunger 91 is in the first position, the locking portion 91k locks onto the peripheral edge of the hole 93 on the inner circumferential surface 4b of the housing 4 (see Figure 12). This prevents the plunger 91 from coming out of the first position to the outside of the housing 4.

[0047] As shown in Figures 8 and 9, the knob portion 92 is the part that the user grasps and is a component for pushing the plunger 91 into the interior of the housing 4 via the knob portion 92. The knob portion 92 is rotatably connected around the rotation axis Q1 to the outer end 91j of the plunger 91 on the housing 4 side and is located on the outside of the housing 4. The knob portion 92 is, for example, rectangular plate-shaped.

[0048] The knob portion 92 has, for example, a rectangular plate-shaped base portion 92a, a connecting portion 92b, a fitting hole 92c, and a locking portion 92d.

[0049] The connecting portion 92b is a part that rotatably connects to the connecting portion 91c of the plunger 91. The connecting portion 92b is, for example, concave and fits into the convex connecting portion 91c of the plunger 91, thereby rotatably connecting to the connecting portion 91c. The knob portion 92 is rotatable between a first direction N1 and a second direction N2 by rotating around the rotation axis Q1. The first direction N1 is parallel to the linear movement direction of the plunger 91 (see Figure 9). The second direction N2 is perpendicular to the linear movement direction of the plunger 91 (i.e., parallel to the outer circumferential surface of the housing 4) (see Figure 8). In this embodiment, the second direction N2 is downward along the outer circumferential surface of the housing 4.

[0050] The fitting hole 92c is the portion into which the projection 94 of the housing 4 can be detachably fitted when the knob 92 is rotated in the second direction N2. The fitting hole 92c is provided in the approximate center of the base 92a so as to penetrate through the base 92a in the thickness direction (vertical direction).

[0051] The locking portion 92d is a stopper that prevents the knob portion 92 from being pushed too far when pushing the knob portion 92 inward to move the plunger 91 from the first position to the second position. The locking portion 92d is provided so as to protrude from the outer circumferential surface (e.g., the top surface) of the base portion 92a at a predetermined location (e.g., between the connecting portion 92b and the fitting hole 92c) of the outer circumferential surface (e.g., the top surface) of the base portion 92a. When the plunger 91 moves from the first position to the second position, the locking portion 92d catches on the periphery of the hole portion 93 on the outer circumferential surface of the housing 4 (see Figure 10). This prevents the user from pushing the knob portion 92 further.

[0052] (4) Operation of the locking mechanism 90 When carrying the laser level 1, the locking mechanism 90 is locked to prevent the optical body 5 from shaking. The procedure for locking the locking mechanism 90 is as shown in Figure 10: First, rotate the knob 92 from the second direction to the first direction so that the knob 92 is parallel to the plunger 91 (see arrow F1 in Figure 10). Then, push the knob 92 inward along the hole 93 of the housing 4 until the locking portion 92d of the knob 92 catches on the outer surface of the housing 4 (see arrow F2 in Figure 10). As a result, the plunger 91 is pushed inward by the knob 92 and moves along the hole 93 from the first position to the second position. When the plunger 91 is in the second position (as shown in Figure 10), the plunger 91 protrudes inward from the housing 4 and pushes the lower part of the optical body 5 laterally, thereby fixing the lower part of the optical body 5 (for example, part T1) against the inner circumferential surface 4b of the housing 4. This fixing prevents the optical body 5 from swinging.

[0053] Furthermore, when the plunger 91 is in the second position, as shown in Figure 11, the corner 91i (second engagement portion) of the second protrusion 91d of the plunger 91 and the corner 95a (first engagement portion) of the first protrusion 95 of the hole 93 engage. This prevents the plunger 91 from moving unintentionally from the second position to the first position side (outside the housing 4). As a result, the oscillation of the optical body 5 is continuously prohibited.

[0054] Furthermore, when using the laser level 1, the lock mechanism 90 is released to allow the optical body 5 to swing. The procedure for releasing the lock mechanism 90 is as shown in Figure 12: First, the knob 92 is pulled out of the hole 93 until the locking portion 91k of the pusher 91 catches on the periphery of the hole 93 on the inner surface of the housing 4 (see arrow F3 in Figure 12). Then, the knob 92 is rotated from the first direction to the second direction to position it along the outer surface of the housing 4 (see arrow F4 in Figure 12). In this state, the projection 94 of the housing 4 fits into the fitting hole 92c of the knob 92, fixing the position of the knob 92.

[0055] Furthermore, as described above, when the knob 92 is rotated in the second direction and positioned along the outer circumferential surface of the housing 4, the plunger 91 moves along the hole 93 from the second position to the first position. When the plunger 91 is in the first position, as shown in Figure 13, the plunger 91 is housed within the hole 93 of the housing 4 and does not protrude to the inside of the housing 4, thus no longer interfering with the oscillation of the optical body 5. This allows the oscillation of the optical body 5 to proceed. Also, when the plunger 91 is in the first position, as shown in Figure 13, the first protrusion 95 (first fitting part) of the hole 93 fits into the recess 91e (second fitting part) of the plunger 91. This prevents the plunger 91 from moving unintentionally from the first position to the second position side (inside the housing 4) and the opposite side of the second position side (outside the housing 4). This allows the oscillation of the optical body 5 to proceed continuously.

[0056] (5) Main effects The laser level 1 according to this embodiment comprises an optical body 5, a housing 4, and a locking mechanism 90. The optical body 5 has a semiconductor laser 52 and an optical system 53. The housing 4 houses the optical body 5 in a state in which it is suspended so as to be able to swing around predetermined axes (first axis portion 55a and second axis portion 55b). The locking mechanism 90 prevents the swinging of the optical body 5. The locking mechanism 90 has a pusher 91. The pusher 91 moves linearly without rotation, thereby bringing a part of the optical body 5 closer to the inner circumferential surface 4b of the housing 4 and fixing it in place.

[0057] In this configuration, the plunger 91 moves linearly without rotation, thereby bringing a portion of the optical body 5 closer to the inner surface 4b of the housing 4 and fixing it in place, thus preventing the optical body 5 from oscillating. In this way, since the plunger 91 does not rotate when preventing the oscillation of the optical body 5, damage to the plunger 91 due to rotation can be suppressed. As a result, the reliability of the locking mechanism 90 that locks the optical body 5 can be improved.

[0058] (6) Variant The following describes modifications of the above embodiment. These modifications can be implemented in combination.

[0059] (Variation 1) As shown in Figures 14A and 14B, the locking mechanism 90 of Modified Example 1 has a pusher 100 (Figure 14A) and a lid 110 (Figure 14B) that is separate from the pusher 100. The hole 93 of the housing 4 of Modified Example 1 has, for example, a circular opening surface.

[0060] The plunger 100 has a frustoconical shape (for example, a truncated cone shape). The plunger 100 is made of an elastic material (for example, cork, resin, or rubber). The cross-sectional area 100c of the plunger 100 gradually increases from the tip 100a to the base 100b. Note that the cross-sectional area 100c of the plunger 100 is the area of ​​the cross-section perpendicular to the opposing directions of the tip 100a and base 100b of the plunger 100.

[0061] The area of ​​the tip 100a of the plunger 100 is smaller than the opening area of ​​the hole 93 in the housing 4, and the area of ​​the base end 100b of the plunger 100 is larger than the opening area of ​​the hole 93 in the housing 4. As a result, when the plunger 100 is inserted into the hole 93 in the housing 4, the outer circumference of the middle part of the plunger 100 catches on the inner surface of the hole 93, thereby fixing the plunger 100 in the hole 93. The middle part of the plunger 100 is the portion between the tip 100a and the base end 100b of the plunger 100. As described above, when the plunger 100 is fixed in the hole 93, the tip 100a of the plunger 100 brings the lower part of the optical body 5 closer to the inner surface 4b of the housing 4 and fixes it in place. This prevents the optical body 5 from swinging.

[0062] The cover 110 is a component that closes the hole 93 of the housing 4 by being fitted into the hole 93 in place of the plunger 91. The cover 110 is made of an elastic material (for example, a material with rubber elasticity). The cover 110 is plate-shaped (for example, circular plate-shaped) and is slightly larger than the opening of the hole 93 in the housing 4. A groove 110a is provided on the outer circumferential surface of the cover 110, extending over the entire circumference of the cover 110. When the cover 110 is fitted into the hole 93 of the housing 4, the peripheral edge of the hole 93 fits into the groove 110a. This fitting fixes the cover 110 in the hole 93.

[0063] In Modification 1, either the plunger 100 or the cover 110 is selectively attached to the hole 93 of the housing 4 from the outside of the housing 4. When the laser level 1 is being carried, the plunger 100 is attached to the hole 93 as shown in Figure 14A. At this time, the plunger 100 moves linearly without rotation, bringing a part (lower part) of the optical body 5 closer to the inner circumferential surface 4b of the housing 4 and fixing it in place. This prevents the optical body 5 from swinging due to the plunger 100. On the other hand, when the laser level 1 is in use, the cover 110 is attached to the hole 93 of the housing 4 as shown in Figure 14B. In this case, the optical body 5 can swing because the plunger 100 is not attached to the hole 93. In addition, by attaching the cover 110 to the hole 93, it is possible to prevent foreign matter from entering the inside of the housing 4 through the hole 93.

[0064] (Modification 2) As shown in Figures 15A and 15B, the locking mechanism 90 of Modified Example 2 includes a pusher 200, a lid 210, and a locking portion 220. The hole 93 of the housing 4 in Modified Example 2 has, for example, a circular opening surface.

[0065] The plunger 200, the lid 210, and the locking portion 220 are integrally formed from, for example, an elastic material (e.g., cork, resin, or rubber).

[0066] The plunger 200 has a frustum shape (for example, a frustum of a cone). The cross-sectional area 200c of the plunger 200 gradually increases from the tip 200a to the base 200b. The cross-sectional area 200c of the plunger 200 is the area of ​​the cross-section perpendicular to the opposing directions of the tip 200a and base 200b of the plunger 200. The area of ​​the tip 200a of the plunger 200 is smaller than the opening area of ​​the hole 93 of the housing 4, and the area of ​​the base 200b of the plunger 200 is the same as or larger than the opening area of ​​the hole 93 of the housing 4 (more specifically, slightly larger).

[0067] The locking portion 220 is the part that catches on the peripheral edge of the hole 93 on the outer peripheral surface 4a of the housing 4 when the plunger 200 or the cover portion 210 is mounted in the hole 93 of the housing 4. The locking portion 220 is plate-shaped (for example, disc-shaped) and is provided on the base end 200b of the plunger 200. The outer peripheral edge of the locking portion 220 protrudes outward from the base end 200b of the plunger 200.

[0068] The cover portion 210 is the part that closes the hole 93 of the housing 4. The cover portion 210 is provided on the main surface of the locking portion 220 opposite to the plunger 200 side. The cover portion 210 is frustoconical (for example, truncated cone). The cover portion 210 is provided on the locking portion 220 such that the base end 210b of the cover portion 210 is connected to the main surface of the locking portion 220. The outer peripheral edge of the locking portion 220 protrudes outward from the outer peripheral side of the cover portion 210.

[0069] The cross-sectional area 210c of the lid portion 210 gradually increases from the tip 210a to the base 210b of the lid portion 210. The cross-sectional area 200c of the lid portion 210 is the area of ​​the cross section perpendicular to the opposing directions of the tip 210a and base 210b of the lid portion 210. The area of ​​the tip 210a of the lid portion 210 is smaller than the opening area of ​​the hole 93 of the housing 4, and the area of ​​the base 210b of the lid portion 210 is the same as or larger than the opening area of ​​the hole 93 of the housing 4 (more specifically, slightly larger).

[0070] The length 210d of the lid portion 210 is shorter than the length 200d of the plunger portion 200. Here, the length 210d of the lid portion 210 is the length from the tip 210a to the base 210b of the lid portion 210, and the length 200d of the plunger portion 200 is the length from the tip 200a to the base 200b of the plunger portion 200.

[0071] In the modified example 2, when the laser level 1 is being carried, as shown in Figure 15A, the plunger 200 of the locking mechanism 90 is inserted into the hole 93 from the outside of the housing 4 until the outer edge of the locking portion 220 contacts the outer surface of the housing 4. At this time, the plunger 100 is inserted into the hole 93 by moving linearly without rotation. In this inserted state, the outer circumference of the base end 200b of the plunger 200 catches on the inner surface of the hole 93, thereby fixing the plunger 200 in the hole 93. In this fixed state, the tip 200a of the plunger 200 brings the lower part of the optical body 5 closer to the inner surface 4b of the housing 4 and fixes it in place. This prevents the optical body 5 from swinging.

[0072] On the other hand, when the laser level 1 is in use, as shown in Figure 15B, the cover portion 210 is inserted into the hole portion 93 from the outside of the housing 4 until the outer peripheral edge of the locking portion 220 contacts the outer peripheral surface of the housing 4. In this inserted state, the outer peripheral edge of the base end 210b of the cover portion 210 catches on the inner peripheral surface of the hole portion 93, thereby fixing the cover portion 210 in the hole portion 93. In this fixed state, since the length 210d of the cover portion 210 is shorter than the length 200d of the plunger 200 (see Figure 15A), the tip 210a of the cover portion 210 does not interfere with the oscillation of the optical body 5. This allows the oscillation of the optical body 5 to be permitted.

[0073] (Variation 3) As shown in Figures 16A and 16B, the locking mechanism 90 of Modified Example 3 has a pusher 300. The hole 93 of the housing 4 of Modified Example 3 has, for example, a circular opening surface.

[0074] The plunger 300 has a plunger body 310, a first locking portion 320, and a second locking portion 330.

[0075] The plunger body 310 is columnar (for example, cylindrical). The cross-sectional area 310c of the plunger body 310 is smallest at the intermediate position 310d and gradually increases from the intermediate position 310d toward both ends 310a and 310b. Note that the cross-sectional area 310c of the plunger body 310 is the area of ​​the cross-section perpendicular to the opposing directions of both ends 310a and 310b of the plunger body 310. The cross-sectional area of ​​the plunger body 310 at the intermediate position 310d is smaller than the opening area of ​​the hole 93 of the housing 4, and the areas of both ends 310a and 310b of the plunger body 310 are the same as or larger than the opening area of ​​the hole 93 of the housing 4 (more specifically, slightly larger). The plunger body 310 is positioned inserted into the hole 93 of the housing 4.

[0076] The first locking portion 320 is the part that catches on the peripheral edge of the hole 93 on the inner circumferential surface 4b of the housing 4 when the plunger 300 is pulled out to the outside of the housing 4. The first locking portion 320 is plate-shaped (for example, disc-shaped) and is provided on one end 310a of the plunger body 310. The outer peripheral edge of the first locking portion 320 protrudes outward from the outer circumferential side of one end 310a of the plunger body 310.

[0077] The second locking portion 330 is the part that catches on the peripheral edge of the hole 93 on the outer peripheral surface 4a of the housing 4 when the plunger 300 is pushed into the housing 4. The second locking portion 330 is plate-shaped (for example, disc-shaped) and is provided on the other end 310b of the plunger body 310. The outer peripheral edge of the second locking portion 330 protrudes outward from the other end 310b of the plunger body 310.

[0078] In the third modified example, when carrying the laser level 1, as shown in Figure 16A, the plunger 300 is pushed inward into the housing 4 until the outer edge of the second locking portion 330 contacts the outer surface 4a of the housing 4. At this time, the plunger 100 is pushed inward into the housing 4 by linear movement without rotation. In this pushed-in state, the outer circumference of the other end 310b of the plunger body 310 catches on the inner surface of the hole 93, thereby fixing the plunger 300 in the hole 93. In this fixed state, the first locking portion 320 of the plunger 300 brings the lower part of the optical body 5 closer to the inner surface 4b of the housing 4 and fixes it in place. This prevents the optical body 5 from swinging.

[0079] When using the laser level 1, as shown in Figure 16B, the plunger 300 is pulled out to the outside of the housing 4 until the outer edge of the first locking part 320 contacts the inner surface 4b of the housing 4. In this pulled-out state, the outer circumference of one end 310a of the plunger body 310 catches on the inner surface of the hole 93, thereby fixing the plunger 300 in the hole 93. In this fixed state, the plunger 300 does not protrude into the housing 4, and therefore does not interfere with the oscillation of the optical body 5, allowing the optical body 5 to oscillate.

[0080] (Modification 4) As shown in Figures 17A and 17B, the lock mechanism 90 of the modified example 4 is a knock-type lock mechanism. The lock mechanism 90 has a pusher 400, a button part 410, and a knock mechanism part 420.

[0081] The plunger 400 is provided at one end of the knock mechanism 420 so as to be able to protrude from and be retracted from the knock mechanism 420.

[0082] The button portion 410 is the part that receives the user's pressing operation. The button portion 410 is provided at the other end of the knock mechanism portion 420 so as to be able to protrude from and retract from the knock mechanism portion 420. The button portion 410 is constantly biased in the direction of protruding from the knock mechanism portion 420 by a spring housed within the knock mechanism portion 420.

[0083] The knock mechanism 420 is inserted into the hole 93 of the housing 4. One end of the knock mechanism 420 (the pusher 400 side) is located inside the housing 4, and the other end of the knock mechanism 420 (the button 410 side) is located outside the housing 4.

[0084] When the button portion 410 is pushed into the knock mechanism 420 with the plunger 400 housed inside, the knock mechanism 420 extends the plunger 400 from one end of the knock mechanism 420. This causes the tip 400a of the plunger 400 to bring the lower part of the optical body 5 closer to the inner surface 4b of the housing 4 and fix it to the inner surface 4b. This prevents the optical body 5 from swinging. Furthermore, when the button portion 410 is pushed into the knock mechanism 420 with the plunger 400 protruding from the knock mechanism 420, the knock mechanism 420 retracts the plunger 400 inside the knock mechanism 420. In other words, when the button portion 410 is repeatedly pushed, the knock mechanism 420 alternately extends and retracts the plunger 400.

[0085] In Modification 4, when carrying the laser level 1, as shown in Figure 17A, the pusher 400 is extended from the knock mechanism 420 by pressing the button 410. At this time, the pusher 100 extends from the knock mechanism 420 by moving linearly without rotation. As a result, the tip 400a of the pusher 400 brings the lower part of the optical body 5 closer to the inner surface 4b of the housing 4 and fixes it to the inner surface 4b, preventing the optical body 5 from swinging. On the other hand, when using the laser level 1, as shown in Figure 17B, the pusher 400 is retracted into the knock mechanism 420 by pressing the button 410. In this retracted state, the pusher 400 does not interfere with the swinging of the optical body 5, and the optical body 5 becomes able to swing.

[0086] (7) Appearance As is clear from the embodiments described above, the following embodiments are possible.

[0087] The laser level (1) of the first embodiment comprises an optical body (5), a housing (4), and a locking mechanism (90). The optical body (5) has a semiconductor laser (52) and an optical system (53). The housing (4) houses the optical body (5) in a state in which it is suspended so as to be able to swing around predetermined axes (55a, 55b). The locking mechanism (90) prevents the swinging of the optical body (5). The locking mechanism (90) has a pusher (91). The pusher (91) moves linearly without rotation, thereby bringing a part (lower part) of the optical body (5) closer to the inner circumferential surface (4b) of the housing (4) and fixing it in place.

[0088] In this configuration, the plunger (91) moves linearly without rotation, thereby bringing a part of the optical body (5) closer to the inner surface (4b) of the housing (4) and fixing it in place, thereby preventing the optical body (5) from oscillating. In this way, since the plunger (91) does not rotate when preventing the optical body (5) from oscillating, damage to the plunger (91) due to rotation can be suppressed. As a result, the reliability of the locking mechanism (90) that locks the optical body (5) can be improved.

[0089] In the second embodiment of the laser level (1), in the first embodiment, the plunger (91) is movable in a linear motion between a first position and a second position. The first position is a position that allows the optical body (5) to swing. The second position is a position in which a part of the optical body (5) is brought close to the inner circumferential surface (4b) of the housing (4) and fixed.

[0090] With this configuration, the plunger (91) can move between the first position and the second position without rotation. This prevents the plunger (91) from being damaged during movement between the first position and the second position.

[0091] In the third embodiment of the laser level (1), in the second embodiment, the housing (4) has a hole (93) into which a plunger (91) is inserted so as to be able to move linearly. The hole (93) has a first engaging portion (95). The plunger (91) has a second engaging portion (91d). When the plunger (91) is in the second position, the first engaging portion (95) and the second engaging portion (91d) engage, thereby restricting the movement of the plunger (91) toward the first position.

[0092] With this configuration, the engagement of the first engaging portion (95) and the second engaging portion (91d) prevents the plunger (91) from moving unintentionally from the second position to the first position.

[0093] In the fourth embodiment of the laser level (1), as in the third embodiment, the hole (93) has a first fitting portion (95). The plunger (91) has a second fitting portion (91e). When the plunger (91) is in the first position, the first fitting portion (95) and the second fitting portion (91e) engage, restricting the movement of the plunger (91) toward the second position and toward the opposite side of the second position.

[0094] With this configuration, the engagement of the first fitting portion (95) and the second fitting portion (91e) prevents the plunger (91) from moving from the first position to the second position or from moving unintentionally to the opposite side of the second position.

[0095] In the fifth embodiment of the laser level (1), as in the fourth embodiment, a first protrusion (95) is provided on the inner circumferential surface (4b) of the hole (93). The outer circumferential surface of the plunger (91) is provided with a second protrusion (91d) that can engage with the first protrusion (95), and a recess (91e) that can fit with the first protrusion (95). The recess (91e) is located on the optical body (5) side of the second protrusion (91d). The first protrusion (95) constitutes a first engaging portion (95) and a first fitting portion (95). The second protrusion (91d) constitutes a second engaging portion (91d). The recess (91e) constitutes a second fitting portion (91e).

[0096] With this configuration, a first engaging portion (95), a second engaging portion (91d), a first fitting portion (95), and a second fitting portion (91e) can be formed by a combination of convex and concave portions.

[0097] In the sixth embodiment of the laser level (1), in the fourth or fifth embodiment, the plunger (91) has a base (91a) and an arm (91b). The arm (91b) is flexible and extends in a direction parallel to the linear movement direction of the plunger (91) at the base (91a). A second engaging portion (91d) and a second fitting portion (91e) are provided on the side surface of the arm (91b).

[0098] With this configuration, the flexibility of the arm portion (91b) allows for easy engagement and disengagement of the first engaging portion (95) and the second engaging portion (91d). Furthermore, the flexibility of the arm portion (91b) allows for easy engagement and disengagement of the first fitting portion (95) and the second fitting portion (91e).

[0099] In the seventh embodiment of the laser level (1), in any one of the first to sixth embodiments, the locking mechanism (90) further includes a knob (92) connected to the plunger (91) and positioned on the outside of the housing (4). The knob (92) is rotatably connected to the plunger (91) between a first direction (N1) parallel to the linear movement direction of the plunger (91) and a second direction (N2) perpendicular to the linear movement direction.

[0100] With this configuration, the plunger (91) can be easily moved from the first position to the second position by extending the knob (92) in the first direction (N1) and pushing the plunger (91) into it. Also, when the plunger (91) is in the first position, the knob (92) can be rotated in the second direction (N2) to prevent it from getting in the way.

[0101] In the eighth aspect of the laser level (1), as in the seventh aspect, the housing (4) has a projection (94) provided on the outer circumferential surface (4a) of the housing (4). The knob (92) has a fitting hole (92c) into which the projection (94) can be fitted. When the knob (92) is rotated in the second direction (N2), the projection (94) fits into the fitting hole (92c).

[0102] With this configuration, the projection (94) fits into the fitting hole (92c), preventing the knob (92) from rotating unintentionally from the second direction (N2) to the first direction (N1).

[0103] In the laser level (1) of the ninth embodiment, in the first embodiment, the housing (4) has a hole (93) into which a plunger (100) is inserted. The cross-sectional area (100c) of the plunger (100) gradually increases from the tip (100a) to the base (100b) of the plunger (100). The plunger (100) is inserted into the hole (93) from the tip (100a) of the plunger (100) and the outer circumference of the plunger (91) is caught on the inner surface of the hole (93), and a part (lower part) of the optical body (5) is brought close to the inner surface (4b) of the housing (4) and fixed.

[0104] This configuration allows for the formation of a plunger (100) with a simple shape. [Explanation of symbols]

[0105] 1. Laser level 4 cabinets 4a Outer surface 4b Inner surface 5 Optical Body 55a First shaft portion (predetermined shaft) 55b Second shaft section (predetermined shaft) 90 Locking mechanism 91 Pusher 91a base 91b Arm 91d Second protrusion (second engagement portion) 91e Recess (second fitting portion) 92. Thumb part 92c fitting hole 93 Hole 94 Protrusion 95 First protrusion (first engaging portion, first fitting portion) 100 plungers 100a tip 100b proximal end 100c cross-sectional area N1 1st direction N2 2nd direction

Claims

1. An optical body having a semiconductor laser and an optical system, A housing that houses the optical body in a state where it is suspended and can swing around a predetermined axis, The optical body is equipped with a locking mechanism that prevents it from swinging, The locking mechanism is It has a pusher that moves linearly without rotation to bring a part of the optical body closer to the inner surface of the housing and fix it in place. The plunger is movable in a linear motion between a first position that allows the optical body to swing and a second position that fixes a part of the optical body closer to the inner surface of the housing. The housing has a hole into which the plunger is inserted so as to be able to move linearly, The aforementioned hole has a first engaging portion, The plunger has a second engaging portion, When the plunger is in the second position, the first engaging portion and the second engaging portion engage, thereby restricting the plunger's movement toward the first position. The aforementioned hole has a first fitting portion, The aforementioned plunger has a second fitting portion, When the plunger is in the first position, the first fitting portion and the second fitting portion engage with each other, thereby restricting the plunger's movement toward the second position and its movement toward the opposite side of the second position. A first protrusion is provided on the inner circumferential surface of the aforementioned hole. The outer circumferential surface of the plunger is provided with a second protrusion that can engage with the first protrusion, and a recess that can fit into the first protrusion. The recess is located on the optical body side of the second protrusion, The first protrusion constitutes the first engaging portion and the first fitting portion, The second protrusion constitutes the second engaging portion, The recess constitutes the second fitting portion. Laser level.

2. The plunger is The base and, The base has a flexible arm that extends in a direction parallel to the linear movement direction of the plunger, The side surface of the arm portion is provided with the second engaging portion and the second fitting portion. The laser level according to claim 1.

3. An optical body having a semiconductor laser and an optical system, A housing that houses the optical body in a state where it is suspended and can swing around a predetermined axis, The optical body is equipped with a locking mechanism that prevents it from swinging, The locking mechanism is It has a pusher that moves linearly without rotation to bring a part of the optical body closer to the inner surface of the housing and fix it in place. The locking mechanism further includes a knob connected to the pusher and positioned on the outside of the housing, The knob is rotatably connected to the plunger in a first direction parallel to the linear movement direction of the plunger and a second direction perpendicular to the linear movement direction. Laser level.

4. The housing has a projection provided on the outer surface of the housing, The knob portion has a fitting hole into which the projection portion can be fitted, With the knob rotated in the second direction, the projection fits into the fitting hole. The laser level according to claim 3.

5. An optical body having a semiconductor laser and an optical system, A housing that houses the optical body in a state where it is suspended and can swing around a predetermined axis, The optical body is equipped with a locking mechanism that prevents it from swinging, The locking mechanism is It has a pusher that moves linearly without rotation to bring a part of the optical body closer to the inner surface of the housing and fix it in place. The housing has a hole into which the plunger is inserted, The cross-sectional area of ​​the plunger gradually increases from the tip to the base end of the plunger. The plunger is inserted into the hole from its tip, and with the outer circumference of the plunger hooked onto the inner surface of the hole, a part of the optical body is brought close to the inner surface of the housing and fixed in place. Laser level.

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