Range finder

Abstract

The utility model belongs to the technical field of distance measuring equipment, and discloses a distance measuring instrument, which comprises a shell, a fixed seat, a writing head and a push button, the side wall of the shell is provided with a first clamping groove and a second clamping groove which are arranged at an interval, the fixed seat is arranged on the inner side of the shell in a sliding manner, and the fixed seat is provided with an elastic sheet; the elastic piece is selectively clamped to the first clamping groove and the second clamping groove so that the fixing base can be fixed relative to the shell, the writing head is installed at one end of the fixing base, and part of the push button extends into the shell and is matched with the fixing base in a sliding mode. The range finder is provided with the extendable writing head, other marking tools do not need to be arranged during use, the writing head can be kept at a fixed position after extending out, an operator does not need to continuously abut against a push button, and the use satisfaction degree of a user is high.

Description

A rangefinder Technical Field

[0001] This utility model relates to the field of distance measuring equipment technology, and in particular to a distance measuring instrument. Background Technology

[0002] Currently, conventional rangefinders only have measurement functions. If you want to mark or record the object being measured, you can only do so by using other marking tools after measurement, which is quite cumbersome. This is especially inconvenient when you need to carry multiple tools while working outdoors, as forgetting to bring them or using them is also a problem. Summary of the Invention

[0003] The purpose of this utility model is to provide a rangefinder with an extendable writing head. It does not require other marking tools during use, and the writing head can be kept in a fixed position after being extended without the operator having to continuously hold the push button, resulting in high user satisfaction.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] This utility model discloses a rangefinder, comprising: a housing, wherein a first slot and a second slot are provided at intervals on the side wall of the housing; a fixing base, wherein the fixing base is slidably installed on the inner side of the housing, and the fixing base is provided with a spring piece, the spring piece being selectively engaged with the first slot and the second slot, so that the fixing base is fixed relative to the housing; a writing head, wherein the writing head is installed at one end of the fixing base; and a push button, wherein a portion of the push button extends into the housing and slidably engages with the fixing base; during the sliding process of the push button relative to the housing, it can compress the spring piece to deform it and disengage it from the first slot or the second slot; after the spring piece disengages from the first slot or the second slot, the push button can abut against the fixing base to push the fixing base to slide relative to the housing, so that the writing head extends out or retracts into the housing.

[0006] In some embodiments, the housing is provided with a through groove, and the first slot and the second slot are spaced apart along the length direction of the through groove; the push button has a snap-fit ​​connector that extends into the through groove, and the fixing base is provided with a snap-fit ​​groove, the snap-fit ​​connector snaps into the snap-fit ​​groove and is slidable relative to the snap-fit ​​groove; wherein: when the snap-fit ​​connector abuts against the side wall of the snap-fit ​​groove along its length direction, continuing to push the push button can cause the fixing base to slide relative to the housing so that the writing head extends out of or retracts into the housing.

[0007] In some embodiments, the push button is provided with a mating groove, the sidewall of which includes a first inclined surface and a second inclined surface arranged at an angle; during the sliding of the push button relative to the housing, the first inclined surface can squeeze the spring piece to deform it and disengage it from the first slot, and the second inclined surface can squeeze the spring piece to deform it and disengage it from the second slot.

[0008] In some embodiments, the housing is provided with a guide groove extending along the sliding direction of the fixing seat, and when the writing head extends out of the housing, the fixing seat is provided with a guide portion that can extend into the guide groove.

[0009] In some embodiments, the housing has a hook portion extending inward on the inner sidewall of the push button, the hook portion having a first support surface, and the fixing seat has a second support surface that abuts against the first support surface.

[0010] In some embodiments, the writing head includes: a fixing part that passes through the end of the housing and is detachably connected to the fixing base; and a pen tip that is detachably connected to the end of the fixing part opposite to the fixing base.

[0011] In some specific embodiments, the fixing base is provided with a connecting part that cooperates with the fixing part, one of the connecting part and the fixing part is provided with a locking hole, and the other of the connecting part and the fixing part is provided with a locking protrusion that cooperates with the locking hole.

[0012] In some specific embodiments, one of the fixing part and the pen head is provided with a threaded hole, and the other of the fixing part and the pen head is provided with a threaded segment, which is threadedly connected to the threaded hole.

[0013] In some embodiments, the housing includes: a main body having a first slot and a second slot, wherein the push button and the fixing seat are slidably disposed on the main body, and the writing head passes through the main body; and a casing having a mounting groove, wherein the main body is inserted into the mounting groove, and a limiting groove is provided on the inner wall of the mounting groove, the limiting groove being used to restrict the main body to prevent the main body from being pushed out of the casing when the push button is pushed.

[0014] In some specific embodiments, the main body is provided with a first fixing hole, and the circuit board of the rangefinder is provided with a second fixing hole corresponding to the first fixing hole. The fixing member passes through the second fixing hole and is connected to the first fixing hole to connect the main body and the circuit board.

[0015] The advantages of this rangefinder are as follows: In actual use, the writing head inside the housing can be extended or retracted by pushing the push button, which facilitates recording by the operator. This means that the rangefinder of this embodiment does not require any other marking equipment during use, making it very convenient to use. At the same time, because the housing has a first and a second locking slot for positioning, the writing head can be stably kept in the retracted or extended position. This prevents the writing head from falling out of the housing under gravity when not in use, and also ensures that the writing head can be kept in a fixed position after being extended without the operator having to continuously push the push button, resulting in high user satisfaction.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] Figure 1 is a schematic diagram of the writing head of the rangefinder according to an embodiment of the present invention when it is retracted.

[0018] Figure 2 is an exploded view of the writing head of the rangefinder according to an embodiment of the present invention when it is extended.

[0019] Figure 3 is an exploded structural diagram of the writing head of the rangefinder according to an embodiment of the present invention when it is extended.

[0020] Figure 4 is a cross-sectional view of the writing head of the rangefinder according to an embodiment of the present invention when it is retracted.

[0021] Figure 5 is a cross-sectional view of the rangefinder of this utility model when the writing head is retracted and the spring is disengaged from the second card hole.

[0022] Figure 6 is a cross-sectional view of the writing head of the rangefinder according to an embodiment of the present invention when it is extended.

[0023] Figure 7 is a cross-sectional view of the rangefinder of this utility model when the writing head is extended and the spring is disengaged from the first card hole;

[0024] Figure 8 is a cross-sectional view of the rangefinder according to an embodiment of the present invention from another direction.

[0025] Figure label:

[0026] 100. Outer shell; 110. Main body; 111. Through groove; 112. First slot; 113. Second slot; 114. Guide groove; 115. Hook portion; 1151. First support surface; 116. First fixing hole; 117. Receiving groove; 120. Housing; 121. Mounting groove; 122. Limiting groove;

[0027] 200, Fixing base; 210, Snap-fit ​​groove; 220, Second support surface; 230, Connecting part; 231, Snap-fit ​​hole; 240, Guide part;

[0028] 300. Writing tip; 310. Fixing part; 311. Locking protrusion; 312. Threaded hole; 320. Pen tip; 321. Threaded section;

[0029] 400. Push button; 410. Snap-fit ​​connector; 420. Mating groove; 421. First inclined surface; 422. Second inclined surface;

[0030] 500, shrapnel;

[0031] 600, Circuit board; 610, Second mounting hole. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0033] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] In the description of this embodiment, the terms "upper," "lower," "left," "right," "front," and "rear," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0035] This utility model discloses a rangefinder. Referring to Figures 1-3, the rangefinder includes a housing 100, a mounting base 200, a writing head 300, and a push button 400. The side wall of the housing 100 is provided with a first slot 112 and a second slot 113 spaced apart. The mounting base 200 is slidably mounted inside the housing 100. The mounting base 200 is provided with a spring piece 500. The middle section of the spring piece 500 has a U-shaped protrusion. The U-shaped protrusion of the spring piece 500 can selectively engage with the first slot 112 and the second slot 113, so that the mounting base 200 is positioned relative to the housing. The writing head 300 is fixed at one end of the fixing base 200. The push button 400 extends into the housing 100 and slidably engages with the fixing base 200. During the sliding process of the push button 400 relative to the housing 100, it can squeeze the U-shaped protrusion to deform it and disengage it from the first slot 112 or the second slot 113. After the U-shaped protrusion disengages from the first slot 112 or the second slot 113, the push button 400 can abut against the fixing base 200 to push the fixing base 200 to slide relative to the housing 100 so that the writing head 300 extends out of or retracts into the housing 100. Understandably, in actual operation, the initial position of the writing head 300 is the retracted position shown in Figure 4. At this time, the writing head 300 is retracted inside the outer casing 100, and the spring clip 500 is engaged in the second slot 113. When the user pushes the push button 400 in direction a, the push button 400 slides relative to the outer casing 100 and squeezes the spring clip 500 to move upward and disengage from the second slot 113. After continuing to push the push button 400, the push button 400 can abut against the fixing base 200 (as shown in Figure 5). Pushing the push button 400 further will cause the fixing base 200 to slide relative to the outer casing 100, allowing the writing head 300 to extend. When the writing head 300 extends, the spring clip 500 can engage in the first slot 112 (as shown in Figure 6). At this time, even if the operator releases the push button 400, the writing head 300 can remain extended from the outer casing 100, which facilitates marking by the operator.

[0036] Conversely, when retracting the writing head 300, its initial position is the extended position shown in Figure 6. At this time, the writing head 300 extends out of the housing 100, and the spring 500 is engaged in the first slot 112. When the user pushes the push button 400 in direction b, the push button 400 slides relative to the housing 100 and squeezes the spring 500, causing it to move upward and disengage from the first slot 112. Continuing to push the push button 400 allows it to abut against the fixing base 200 (as shown in Figure 7). Pushing the push button 400 further allows the fixing base 200 to slide relative to the housing 100, causing the writing head 300 to retract. When the writing head 300 is fully retracted, the spring 500 can engage in the second slot 113 (as shown in Figure 4). Whether pushing the writing head 300 to extend or retract, a sound will be emitted when the spring 500 engages in the first slot 112 and the second slot 113 to indicate to the user that the operation is complete and the push button 400 can be released.

[0037] In summary, the rangefinder of this embodiment allows the writing head 300 inside the housing 100 to extend or retract into the housing 100 by pushing the push button 400 during actual use. This facilitates recording by the operator and eliminates the need for additional marking devices, making it very convenient to use. Furthermore, the presence of a first slot 112 and a second slot 113 on the housing 100 ensures that the writing head 300 can be stably held in either the retracted or extended position. This prevents the writing head 300 from falling out of the housing 100 under gravity when not in use, and also ensures that the writing head 300 remains in a fixed position after extension without requiring the operator to continuously press the push button 400, resulting in high user satisfaction.

[0038] Optionally, referring to Figures 2 and 8, the outer casing 100 is provided with a through groove 111, and a first slot 112 and a second slot 113 are spaced apart along the length of the through groove 111. The push button 400 has a snap-fit ​​connector 410 that extends into the through groove 111, and the fixing base 200 has a snap-fit ​​groove 210. The snap-fit ​​connector 410 snaps into the snap-fit ​​groove 210 and is slidable relative to the snap-fit ​​groove 210. When the snap-fit ​​connector 410 abuts against the side wall of the snap-fit ​​groove 210 along its length, continuing to push the push button 400 can cause the fixing base 200 to slide relative to the outer casing 100, so that the writing head 300 extends or retracts into the outer casing 100. It can be understood that the through groove 111 on the outer casing 100, in actual operation, allows the push button 400 to slide within the through groove 111, which serves to limit and guide the push button 400, preventing it from tilting during movement. The push button 400 is equipped with a snap-fit ​​connector 410, and the mounting base 200 is equipped with a snap-fit ​​groove 210. On the one hand, during actual assembly, simply aligning the snap-fit ​​connector 410 with the snap-fit ​​groove 210 and pressing the push button 400 allows it to be installed onto the mounting base 200, facilitating assembly. On the other hand, the cooperation between the snap-fit ​​groove 210 and the snap-fit ​​connector 410 prevents the push button 400 from detaching from the mounting base 200 and guides the movement of the push button 400, preventing it from tilting. Furthermore, when the snap-fit ​​connector 410 abuts against the side wall of the snap-fit ​​groove 210 along its length, continuing to push the push button 400 allows the mounting base 200 to slide relative to the outer casing 100, enabling the writing head 300 to extend or retract into the outer casing 100. This ensures that the push button 400 can stably push the mounting base 200 to slide relative to the outer casing 100.

[0039] Optionally, the outer casing 100 is provided with a receiving groove 117, and a through groove 111 is provided on the bottom wall of the receiving groove 117. The push button 400 is slidably fitted within the receiving groove 117. It is understood that the push button 400 fitting within the receiving groove 117 prevents it from protruding from the outer casing 100, resulting in a relatively flat outer surface of the rangefinder and improving its aesthetic appearance. Furthermore, during actual operation, when both ends of the push button 400 abut against the two side walls of the receiving groove 117, it means that the push button 400 has been pushed into place, thus providing clear feedback to the operator during operation that the writing head 300 has extended and retracted into place.

[0040] Alternatively, the push button 400 may be provided with multiple raised ridges. Understandably, the added raised ridges can increase the friction between the operator and the push button 400, thereby facilitating the operator's operation of the push button 400.

[0041] Of course, it should be noted that in other embodiments of this utility model, the push button 400 can be directly and slidably connected to the outer shell 100, and the fixing base 200 has stop parts at both ends. After the push button 400 pushes up the spring piece 500, it can stop on the stop part and also perform the above function.

[0042] Optionally, referring to Figures 5 and 7, the push button 400 is provided with a mating groove 420. The sidewall of the mating groove 420 includes a first inclined surface 421 and a second inclined surface 422 arranged at an angle. During the sliding process of the push button 400 relative to the outer casing 100, the first inclined surface 421 can compress the spring piece 500 to deform it and disengage it from the first slot 112, and the second inclined surface 422 can compress the spring piece 500 to deform it and disengage it from the second slot 113. It can be understood that when the operator pushes the push button 400 along direction a, the second inclined surface 422 abuts against the spring piece 500. Since the second inclined surface 422 is inclined, when the operator continues to push the push button 400 along direction a, the second inclined surface 422 can gradually compress the spring piece 500 to move upward until it disengages from the second slot 113. Similarly, when the operator pushes the push button 400 in direction a, the first inclined surface 421 abuts against the spring piece 500. Because the first inclined surface 421 is tilted, when the operator continues to push the push button 400 in direction b, the first inclined surface 421 can gradually squeeze the spring piece 500, causing it to move upwards until it disengages from the first slot 112. The tilted first inclined surface 421 and the second inclined surface 422 allow for smoother squeezing of the spring piece 500, enabling it to deform smoothly and disengage from the first slot 112 or the second slot 113. Of course, in other embodiments of this invention, the push button 400 can be directly provided with a wedge-shaped protrusion for squeezing the spring piece 500, and is not limited to the structure of the mating groove 420.

[0043] Referring to Figure 3, the housing 100 has a guide groove 114 extending along the sliding direction of the fixing seat 200. When the writing head 300 extends out of the housing 100, the fixing seat 200 has a guide portion 240 that can extend into the guide groove 114. It can be understood that when the operator pushes the push button 400 in direction a, the guide portion 240 can gradually engage with the guide groove 114. On the one hand, the cooperation between the guide groove 114 and the guide portion 240 can restrict the movement direction of the fixing seat 200, ensuring that the fixing seat 200 can only move along the extension direction of the guide groove 114, thereby ensuring that the writing head 300 can smoothly pass through the end of the housing 100. On the other hand, after the writing head 300 extends out, the stability of the writing head 300 is improved because the guide portion 240 is engaged in the guide groove 114, making it less likely for the writing head 300 to wobble at the end of the housing 100.

[0044] Referring to Figure 3, the inner wall of the outer casing 100 relative to the push button 400 is provided with a hook portion 115 extending inward. The hook portion 115 has a first support surface 1151, and the fixing seat 200 is provided with a second support surface 220 that abuts against the first support surface 1151. It can be understood that in actual operation, when the operator pushes the push button 400 to slide, the second support surface 220 abuts against the hook portion 115, and the fixing seat 200 slides on the hook portion 115. On the one hand, the hook portion 115 provides support for the fixing seat 200 during the sliding process, and on the other hand, it guides the sliding of the fixing seat 200 to prevent the fixing seat 200 from tilting during the sliding process.

[0045] Referring to Figures 3 and 4, the writing head 300 includes a fixing part 310 and a pen head 320. The fixing part 310 passes through the end of the housing 100 and is detachably connected to the fixing base 200. The pen head 320 is detachably connected to the end of the fixing part 310 opposite to the fixing base 200. It is understood that by dividing the writing head 300 into two detachable parts, and with the fixing part 310 detachably connected to the fixing base 200, different combinations of the fixing part 310 and pen head 320 can be selected to form the writing head 300 according to measurement needs during actual use, thereby giving the rangefinder of this embodiment a wider range of applications.

[0046] Optionally, the fixing base 200 is provided with a connecting portion 230 that mates with the fixing portion 310. The connecting portion 230 is provided with a locking hole 231, and the fixing portion 310 is provided with a locking protrusion 311 that mates with the locking hole 231. It is understood that in the actual assembly process, assembly can be completed simply by inserting the fixing portion 310 into the connecting portion 230 so that the locking protrusion 311 engages with the locking hole 231. This is convenient and also helps improve the connection stability between the writing head 300 and the fixing base 200. Optionally, the locking protrusion 311 is provided with a deformation groove to facilitate the locking protrusion 311 engaging with the locking hole 231. In an alternative embodiment, the connecting portion 230 is provided with a locking protrusion 311, and the fixing portion 310 is provided with a locking hole 231. Of course, in other embodiments of this utility model, the detachable connection method of the connecting portion 230 and the fixing portion 310 can also be selected in other ways according to actual needs, such as a threaded connection.

[0047] Optionally, the fixing part 310 is provided with a threaded hole 312, and the pen head 320 is provided with a threaded section 321, which is threadedly connected to the threaded hole 312. It can be understood that using a threaded connection to connect the pen head 320 and the fixing part 310 not only facilitates the connection between the pen head 320 and the fixing part 310, but also improves the connection strength between the pen head 320 and the fixing part 310.

[0048] Optionally, the pen tip 320 can be equipped with a permanent tip, i.e., a pure metal or alloy tip, which can scratch hard surfaces such as concrete and rock.

[0049] Optionally, the pen tip 320 can be used with markers, ballpoint pens, etc., and can be used with soft surfaces such as writing paper.

[0050] Optionally, the pen tip 320 can be a capacitive pen, which can be used with capacitive screens and touch screens for writing.

[0051] Referring to Figure 2, the outer casing 100 includes a main body 110 and a housing 120. The main body 110 is provided with a first slot 112 and a second slot 113, and the push button 400 and the fixing base 200 are slidably disposed on the main body 110. The writing head 300 passes through the main body 110. The housing 120 has a mounting groove 121, in which the main body 110 is inserted. It can be understood that the main body 110 serves as the supporting part for the push button 400, the writing head 300, and the fixing base 200, while the housing 120 serves as an appearance component, which on the one hand facilitates the assembly of the rangefinder, and on the other hand helps to improve the aesthetics of the rangefinder.

[0052] Optionally, a limiting groove 122 is provided on the inner wall of the mounting groove 121. The limiting groove 122 is used to limit the main body 110 to prevent the main body 110 from being pushed out of the housing 120 when the push button 400 is pushed. The main body 110 is provided with a limiting protrusion (not shown in the figure) that cooperates with the limiting groove 122. It can be understood that in the actual installation process, the circuit board 600 is first installed on the main body 110, and then the push button 400, the fixing seat 200, the writing head 300 and other components are installed on the main body 110. After that, the main body 110 is installed into the mounting groove 121, and it is necessary to ensure that the limiting protrusion is inserted into the limiting groove 122 during the installation process.

[0053] Optionally, the main body 110 is provided with a first fixing hole 116, and the circuit board 600 of the rangefinder is provided with a second fixing hole 610 corresponding to the first fixing hole 116. The fixing member passes through the second fixing hole 610 and connects to the first fixing hole 116 to connect the main body 110 and the circuit board 600. It can be understood that by connecting the circuit board 600 and the main body 110 through the fixing member, the circuit board 600 can be easily fixed inside the housing 100, and the stability of the circuit board 600 inside the housing 100 can be improved.

[0054] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0055] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A rangefinder, characterized in that, include: A housing (100) having a first slot (112) and a second slot (113) spaced apart on its sidewall; a fixing seat (200) slidably mounted on the inner side of the housing (100), the fixing seat (200) having a spring piece (500) selectively engaging with the first slot (112) and the second slot (113) to fix the fixing seat (200) relative to the housing (100); a writing head (300) mounted on one end of the fixing seat (200); and a push button (400). The part of the 00) extends into the outer shell (100) and slidably engages with the fixing seat (200); the push button (400) can squeeze the spring (500) to deform it and disengage from the first slot (112) or the second slot (113) during the sliding process of the push button (400) relative to the outer shell (100). After the spring (500) disengages from the first slot (112) or the second slot (113), the push button (400) can abut against the fixing seat (200) to push the fixing seat (200) to slide relative to the outer shell (100) so that the writing head (300) extends out or retracts into the outer shell (100).

2. The rangefinder according to claim 1, characterized in that, The outer casing (100) is provided with a through groove (111), and the first slot (112) and the second slot (113) are spaced apart along the length direction of the through groove (111); the push button (400) has a snap-fit ​​connector (410) that extends into the through groove (111), and the fixing base (200) is provided with a snap-fit ​​groove (210), and the snap-fit ​​connector (410) snaps into the snap-fit ​​groove (210) and is slidable relative to the snap-fit ​​groove (210); wherein: when the snap-fit ​​connector (410) abuts against the side wall of the snap-fit ​​groove (210) along its length direction, continuing to push the push button (400) can make the fixing base (200) slide relative to the outer casing (100) so that the writing head (300) extends out or retracts into the outer casing (100).

3. The rangefinder according to claim 1, characterized in that, The push button (400) is provided with a mating groove (420). The sidewall of the mating groove (420) includes a first inclined surface (421) and a second inclined surface (422) arranged at an angle. During the sliding process of the push button (400) relative to the outer shell (100), the first inclined surface (421) can squeeze the spring piece (500) to deform it and disengage it from the first slot (112), and the second inclined surface (422) can squeeze the spring piece (500) to deform it and disengage it from the second slot (113).

4. The rangefinder according to claim 1, characterized in that, The housing (100) has a guide groove (114) extending along the sliding direction of the fixing seat (200). When the writing head (300) extends out of the housing (100), the fixing seat (200) has a guide part (240) that can extend into the guide groove (114).

5. The rangefinder according to claim 1, characterized in that, The outer casing (100) has a hook portion (115) extending inward on the inner wall of the push button (400). The hook portion (115) has a first support surface (1151). The fixing base (200) has a second support surface (220) that abuts against the first support surface (1151).

6. The rangefinder according to claim 1, characterized in that, The writing head (300) includes: a fixing part (310) which passes through the end of the outer shell (100) and is detachably connected to the fixing seat (200); and a pen head (320) which is detachably connected to the end of the fixing part (310) away from the fixing seat (200).

7. The rangefinder according to claim 6, characterized in that, The fixing base (200) is provided with a connecting part (230) that cooperates with the fixing part (310). One of the connecting part (230) and the fixing part (310) is provided with a locking hole (231), and the other of the connecting part (230) and the fixing part (310) is provided with a locking protrusion (311) that cooperates with the locking hole (231).

8. The rangefinder according to claim 6, characterized in that, One of the fixing part (310) and the pen head (320) is provided with a threaded hole (312), and the other of the fixing part (310) and the pen head (320) is provided with a threaded section (321), which is threadedly connected to the threaded hole (312).

9. The rangefinder according to claim 1, characterized in that, The outer casing (100) includes: a main body (110), on which the first slot (112) and the second slot (113) are provided, and the push button (400) and the fixing seat (200) are slidably disposed on the main body (110), and the writing head (300) passes through the main body (110); and a housing (120), which has a mounting groove (121), in which the main body (110) is inserted, and a limiting groove (122) is provided on the inner wall of the mounting groove (121), the limiting groove (122) being used to limit the main body (110) to prevent the main body (110) from being pushed out of the housing (120) when the push button (400) is pushed.

10. The rangefinder according to claim 9, characterized in that, The main body (110) is provided with a first fixing hole (116), and the circuit board (600) of the rangefinder is provided with a second fixing hole (610) corresponding to the first fixing hole (116). The fixing member passes through the second fixing hole (610) and connects to the first fixing hole (116) to connect the main body (110) and the circuit board (600).

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