TWI575825B - Electronic device - Google Patents

Description

Electronic device

The present invention relates to an electronic device having a terminal block.

As an electronic device, in order to electrically connect with other devices, there are often terminal blocks commonly used in electronic connections, such as temperature controllers, programmable controllers, and the like, which have terminal blocks. 1 is a perspective view schematically showing an electronic device having a conventional terminal block, FIG. 2 is a partially exploded perspective view showing a conventional terminal block, and FIG. 3 is a partial cross-sectional view schematically showing a conventional terminal block. . As shown in FIG. 1, the terminal block has a base 1 made of plastic, and a cylindrical case 2 is integrally formed on the outer edge of the base 1, and a plurality of wires for connecting electric wires are provided on the base 1 of the terminal block. In the portion 3, each of the wiring portions 3 has a metal terminal 31, a spring piece terminal 32, and a screw 33. As shown in FIG. 2, after the metal terminal 31 is placed on the base 1, the spring tab terminal 32 having the barbs on the side is pressed into the base 1 to snap the barbs into the base, and then the screw 33 is screwed in. The internal thread of the metal terminal 31 is screwed, thereby forming the state shown in FIG. Further, a circuit board or the like is inserted inside the casing 1 to bring the circuit board into contact with the contacts of the shrapnel terminal 31.

In the terminal block described above, the metal terminal 31 is prevented from coming off by the interference fit of the barbed portion of the spring terminal 32 and the susceptor 1. Further, when the electric wire is connected, one end of the electric wire (not shown) is interposed between the screw and the spring terminal 32, and the other end of the electric wire is connected to another device, thereby realizing The connection of the board to other devices. In actual operation, the electric wire is usually pulled, and since the metal terminal 31 is fixed only by the interference fit of the elastic piece terminal 32 and the base 1, the metal terminal, the elastic piece terminal, and the like are often pulled out from the base. Falling off, causing adverse effects such as disconnection.

Further, in the patent document CN101635422A, a structure of a terminal block is disclosed in which the nut is prevented from coming off by only the interference fit of the barbed portion of the insert and the seat. Therefore, in the actual operation, in the actual operation, since the electric wire is usually pulled, the insert, the nut, and the like are often pulled out from the seat body and fall off, thereby causing an adverse effect such as an open circuit (refer to FIG. 1 of CN101635422A for details). Figure 7).

Patent Document 1: CN101635422A.

The present invention has been made to solve the above problems, and an object of the invention is to provide an electronic device having a terminal block capable of preventing a metal terminal or the like from being pulled out and falling off.

The electronic device of the present invention has a terminal block having a base, a screw, a fixing member of a fixing screw, and a spring piece terminal, the elastic piece terminal being electrically conductive and having a through hole for passing the screw, and the elastic piece The terminal is disposed between the head of the screw and the fixing member, wherein the fixing member has at least one claw that engages with the base.

In the invention, preferably, the fixing member has a first cylindrical portion provided with an internal thread on the inner surface and an annular flange provided at one end of the first cylindrical portion at the flange The claw that extends toward the other end side of the hook shape of the first cylindrical portion is provided.

In the present invention, preferably, at least one first slit is provided on a flange of the fixing member, the spring terminal has a protrusion, and the protrusion is inserted into the first portion provided on the flange Inside a cut.

In the present invention, preferably, the base is formed with a recessed portion, the bottom plate of the recessed portion is formed with a cutout portion and a circular through hole, and the first cylindrical portion of the fixing member is inserted into the through hole a flange of the fixing member is placed on an upper surface of the bottom plate of the recess, the claw is inserted into the cutout portion, and the claw is rotated by the fixing member The base is engaged.

In the present invention, preferably, a second cylindrical portion is formed coaxially with the through hole on a lower surface of the bottom plate of the recessed portion, and an outer peripheral surface of the second cylindrical portion is formed integrally with the bottom plate An arm portion having at least one cantilever beam is formed, and an upper surface of the bottom portion of the arm portion is provided with an elastically deformable protrusion, that is, a guiding stopper having a direction from an upper surface of the arm portion a plane extending from a front end of the protrusion and parallel to a central axis of the second cylindrical portion, and an inclined surface extending from an upper surface of the arm portion toward a front end of the protrusion and gradually approaching the plane, rotating at the fixing member In a forward direction in which the claw advances in a direction in which the base is engaged, the plane is further forward than the inclined surface, and the inclined surface passes through the fixing member at the claw Advancing the advancement of the jaws as the rotation advances in a direction in which the base is engaged, the plane blocking the jaws from being opposite to the advancing direction after the jaws are engaged with the base Move in direction.

In the present invention, preferably, the claw is in the orientation The front end extending at the other end side is a front surface in the forward direction and has an inclined surface inclined along the inclined surface of the guiding block, and the base is rotated toward the base by the fixing member. When the seat engagement direction advances, the inclined surface of the claw is guided by the inclined surface of the guide stopper.

In the invention, preferably, the inner diameter of the through hole is larger than the inner diameter of the second cylindrical portion.

In the invention, preferably, the claw is caught on the lower surface of the bottom plate of the recess.

In the present invention, preferably, the arm portions are respectively provided at two opposite positions of the second cylindrical portion, and the guide blocking portions are respectively provided on each of the arm portions, The hook-shaped claws are respectively disposed at opposite positions of the flange of the fixing member.

In the present invention, preferably, on the flange of the fixing member, with respect to a position where the claw is provided, the claw is moved toward the base when the fixing member is rotated a second slit is provided on the advancing direction side of the advancing direction, and has an annular outer peripheral surface and a rotationally fixed outer peripheral surface at an outer edge of the flange, the annular outer peripheral surface being at a center of the flange The distance of the shaft is constant, the rotation fixing the distance of the outer edge surface from the central axis, and the distance from the central axis is gradually longer as the distance from the second outer slit is closer to the second slit When the claw is engaged with the base, the rotationally fixed outer peripheral surface is locked with the side wall of the recess.

In the invention, preferably, the fixing member is made of metal.

According to the electronic device of the present invention, metal terminals can be avoided The shrapnel terminals and the like are pulled out by pulling the electric wires, and the electrical connection between the devices can be reliably ensured. In addition, when the metal terminal is mounted, the metal terminal is pressed with a small pressure (almost equal to 0), and the metal terminal is rotated with a small torque, so that the claw of the metal terminal is engaged with the base, thereby assembling Very convenient.

1‧‧‧Base

2‧‧‧Shell

3‧‧‧ wiring department

11‧‧‧Metal terminals

12‧‧‧Sheet terminal

13‧‧‧ screws

31‧‧‧Metal terminals

32‧‧‧Slide terminal

33‧‧‧ screws

101‧‧‧ recess

102‧‧‧Cylinder

103‧‧‧cutting

111‧‧‧Cylinder

112‧‧‧Flange

113‧‧‧Second incision

114‧‧‧Claws

115‧‧‧ first incision

116‧‧‧Rotating fixed rim surface

121‧‧‧ Main body

122‧‧‧First bend

123‧‧‧Second bend

124‧‧‧ barbed

131‧‧‧Washers

1011‧‧‧through hole

1012‧‧‧cutting

1013‧‧‧floor

1021‧‧‧ Arms

1022‧‧‧Guidance Block

1141‧‧‧Bend

1142‧‧‧First Extension

1143‧‧‧Second extension

1144‧‧‧ sloped surface

1211‧‧‧through hole

1212‧‧‧ Protrusion

1221‧‧‧Contacts

10131‧‧‧ upper surface

10132‧‧‧ lower surface

10221‧‧‧ sloped surface

10222‧‧‧ plane

Fig. 1 schematically shows a perspective view of an electronic device having a conventional terminal block.

Fig. 2 is a partially exploded perspective view showing a conventional terminal block.

Fig. 3 is a partial cross-sectional view schematically showing a conventional terminal block.

4 is a partially exploded perspective view schematically showing a terminal block of an electronic device of the present invention.

5A and 5B are perspective views schematically showing metal terminals of a terminal block of the present invention.

Fig. 6 is a perspective view schematically showing a shrapnel terminal of the present invention.

Figure 7A is a partial enlarged view schematically showing a susceptor of the present invention, Figure 7B is a partial plan view schematically showing a susceptor of the present invention; and Figure 7C is a partial cross-sectional view schematically showing a metal terminal mounted on a susceptor Fig. 7D and Fig. 7E are enlarged views schematically showing the guiding stopper.

8A to 8C are views when a metal terminal is schematically assembled.

9A to 9B are views schematically showing a state in which a shrapnel terminal is assembled.

10A to 10C are views when the screws are schematically assembled.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same or corresponding components are denoted by the same reference numerals, and the description thereof will not be repeated.

4 is a partially exploded perspective view schematically showing a terminal block of an electronic device of the present invention. As shown in FIG. 4, the electronic device of the present invention has a cylindrical plastic case, and a terminal block is provided at one end of the case, and the terminal block has a plastic base formed integrally on the outer edge of the base. On the housing, a plurality of wiring portions for connecting electric wires are provided on the base of the terminal block. Each of the wiring portions has a screw 13, a metal terminal 11 as a fixing member for fixing the screw 13, and a conductive elastic terminal 12, and one end of a wire (not shown) is sandwiched between the elastic piece terminal 12 and the washer 131 of the screw 13. In the present invention, the gasket 131 may not be provided, and the electric wire is directly sandwiched between the elastic piece terminal 12 and the head of the screw 13. Further, in the present invention, the fixing member is not limited to the metal terminal, and a terminal such as a hard resin-made internal thread may be used as long as the screw 13 can be firmly fixed. Further, in the present invention, the side of the susceptor that is close to the other end of the casing is referred to as the lower side, and the side of the susceptor that is away from the other end of the casing is referred to as the upper side.

5A and 5B are perspective views schematically showing the metal terminal 11 of the terminal block of the present invention. The metal terminal 11 has a cylindrical portion 111 provided with an internal thread on the inner surface and a substantially annular flange 112 integrally formed at one end of the cylindrical portion 111, and are formed at opposite positions of the outer edge of the flange 112, respectively. In the second slit 113, a hook-shaped two claws 114 which are bent at the lower side of the other end of the cylindrical portion 111 are integrally formed on the flange 112. Each of the claws 114 is preferably substantially L-shaped and has a bend connected to the flange 112, respectively. The curved portion 1141, the quadrangular columnar first extending portion 1142 extending downward from the curved portion 1141, and the direction of rotation perpendicular to the first extending portion 1142 (in the present invention, the clockwise direction in the plan view is the forward direction) a side-extending quadrangular columnar second extension 1143. The upper surface of the second extending portion 1143 is for abutting against the lower surface of the bottom plate of the recess portion of the pedestal to be described later, so that the metal terminal 11 is prevented from being pulled out and falling off. Further, the joint between the front surface and the lower surface of the second extending portion 1143 is cut away to form an inclined surface 1144 (that is, the claw is at the front end which is extended toward the other end side of the cylindrical portion and is the advancing direction The front position has an inclined surface that is inclined along an inclined surface of a guide blocking portion to be described later. The inclined surface 1144 is for abutting against an inclined surface of a guiding stopper described later and sliding along the sliding blocking portion to press the guiding blocking portion. Deformation occurs (details are described later).

Further, a first slit 115 is formed at a position facing each other at the outer edge of the flange 112 of the metal terminal 11, and two projections of the elastic piece terminal 12 to be described later can be inserted into the first slit 115 to further prevent The metal terminal 11 rotates.

Further, in the present invention, on the outer edge of the flange 112, the direction in which the claw 114 advances in the direction of engagement with the base when the metal terminal 11 is rotated with respect to the position where the claw 114 is provided can be used. A second slit 113 is provided on the side of the hour hand direction, and has an annular outer peripheral surface and a rotationally fixed outer peripheral surface at the outer edge of the annular flange 112, the annular outer peripheral surface being located from the central axis of the flange 112 The distance is constant, the distance of the rotation fixed outer edge surface from the central axis is gradually longer than the distance from the central axis of the annular outer edge surface as approaching the second slit 113, at the claw 114 and the base When engaged, the rotation fixing outer edge surface is locked with the side wall of the recess. Thereby preventing the metal end The sub-11 rotates clockwise when an excessive force is applied by tightening the screw with force.

Fig. 6 is a perspective view schematically showing the elastic piece terminal 12 of the present invention. The shrapnel terminal 12 is formed by punching and bending a flat plate-shaped elastic piece, and is disposed between the head of the screw 13 and the metal terminal 11. The shrapnel terminal 12 has a main body portion 121, a first bent portion 122, and a second bent portion 123. A through hole 1211 for the passage of the screw 13 is formed in the main body portion 121, and a protrusion 1212 which is bent downward is formed on both sides of the main body portion 121, and the protrusion 1212 is used for engaging the above-mentioned metal terminal. The first slit 115 of the 11 is inside. A plurality of contacts 1221 are formed at the top end of the first bent portion 122, and the contacts 1221 are connected to a circuit board (not shown). In addition, barbs 124 are formed on the first and second bent portions 122 and 123. When the spring terminal 12 is pressed into the base, the barbs 124 of the spring terminal 12 are interference-fitted with the base to cause an inverted fit. The thorn 124 is snapped into the pedestal to fix the sprocket terminal 12 and the pedestal, thereby further fixing the metal terminal 11. In the present invention, since the claw of the metal terminal 11 is engaged with the base, the barb 124 may not be provided on the spring terminal 12.

Figure 7A is a partial enlarged view schematically showing a susceptor of the present invention, Figure 7B is a partial plan view schematically showing a susceptor of the present invention; and Figure 7C is a partial cross-sectional view schematically showing a metal terminal mounted on a susceptor Fig. 7D and Fig. 7E are enlarged views schematically showing the guiding stopper. As shown in the figure, a concave portion 101 is formed in the base, a circular through hole 1011 is formed in the bottom plate 1013 of the concave portion 101, and a claw for inserting the metal terminal 11 is formed on the bottom plate 1013 of the concave portion 101. 114 and the two cutting portions 1012 capable of allowing the claws 114 to rotate by a certain angle, the claws 114 are engaged with the bases in the cutout portions 1012 by the rotation of the metal terminals 11. Further, a cylindrical portion 102 is formed integrally with the through hole 1011 on the lower surface 10132 of the bottom plate 1013 of the recess 101 and integrally formed with the bottom plate 1013, and the inner diameter d of the cylindrical portion 102 is smaller than the inner diameter D of the through hole 1011, and The cylindrical portion 102 can accommodate the lower end of the screw 13 after the screw 13 is mounted (see FIG. 10C) to prevent the lower end of the screw 13 from coming into contact with other components, thereby causing a short circuit or the like to occur. Further, at two positions facing each other on the outer circumferential surface of the cylindrical portion 102, two flat arm portions 1021 are provided in a cantilever shape and perpendicular to the axis of the through hole 1011, at the top end of the arm portion 1021. On the upper surface of the side, that is, the bottom plate side, there is provided an elastically deformable guiding stopper 1022 as a protrusion having a plane 10222 perpendicular to the flat arm portion 1021 (ie, from the upper side of the arm portion) a surface extending toward the front end of the protrusion and parallel to the central axis of the second cylindrical portion) and an inclined surface 10221 which is inclined upward from the upper surface of the arm portion 1021 as approaching the plane 10222 (ie, from An upper surface of the arm portion extends toward a front end of the protrusion and gradually approaches an inclined surface of the plane, and a forward direction in which the claw 14 advances in a direction of engagement with the base when the metal terminal 11 rotates (ie, In the clockwise direction, the plane 10222 is further forward than the inclined surface 10221, and the inclined surface 10221 is rotated clockwise by the rotation of the metal terminal 11 by the claw 114 of the metal terminal 11 Guide the claw 1 when the direction of the engagement advances The advancement of the plane 14222 blocks the movement of the claws 114 of the metal terminal 11 in the counterclockwise direction of rotation after the jaws 114 are engaged with the base. When the claw 114 advances in the direction of engaging with the base due to the rotation of the metal terminal 11, the The inclined surface 1144 of the claw 114 is guided by the inclined surface 10221 of the guiding blocking portion 1022, that is, the inclined surface 10221 of the guiding blocking portion 1022 guides the advancement of the claw 114, and the guiding blocking portion 1022 can be gripped when the guiding claw 114 advances. When the pressing portion 114 is elastically deformed, it moves to the side away from the base, and the cantilever-shaped arm portion 1021 can also be elastically deformed downward when the guiding blocking portion 1022 is pressed by the claw 114, so that the claw 114 smoothly passes over the guide. The blocking portion 1022 is engaged with the base, and after the claw 114 is engaged with the base, the guiding blocking portion 1022 blocks the claw 114 from moving counterclockwise by a plane perpendicular to the arm portion 1021, thereby avoiding the metal terminal 11 The claw 114 is separated from the base to cause the metal terminal 11 to come off the base.

The bottom plate 1013 of the recess 101 of the susceptor is for placing the flange 112 of the metal terminal 11, and the through hole 1011 of the recess 101 is for inserting the cylindrical portion 111 of the metal terminal 11, and the outer diameter of the cylindrical portion 111 is smaller than that of the through hole 1011. The inner diameter D is larger than the inner diameter d of the cylindrical portion 102. The cylindrical portion 111 of the metal terminal 11 can abut against the stepped portion formed by the through hole 1011 and the cylindrical portion 102 so that the metal terminal 11 can be more stably supported. In the present invention, the cylindrical portion 111 of the metal terminal 11 may not be in contact with the step portion, and the step portion may not be formed between the cylindrical portion 102 and the through hole 1011.

In addition, two cutout portions 103 are formed on the base according to the shape of the spring terminal 12, and the first bending portion 122 and the second portion of the spring terminal 12 can be press-fitted into the two cutout portions 103, respectively. The bent portion 123.

Next, the assembly of the terminal block of the present invention will be described with reference to the drawings.

8A to 8C are diagrams when the metal terminals are schematically assembled Figure. First, the metal terminal 11 is placed above the susceptor with the two claws 114 of the metal terminal 11 facing the two cutout portions 1012 of the recess 101 of the pedestal, respectively, and then with a small force (about The metal terminal 11 is pressed into the metal terminal 11 so that the flange 112 of the metal terminal 11 is placed on the upper surface 10131 of the bottom plate 1013 of the recess 101. Next, the metal terminal 11 is advanced in the clockwise direction with a small torque, and the inclined surface 1144 of the claw 114 of the metal terminal 11 abuts against the inclined surface 10221 of the guiding stopper 1022, and the inclined surface 10221 guides the claw 114 to the forward direction. The hour hand advances, and as the claw 114 advances, the pawl 114 presses the guide stopper 1022 to elastically deform, and the cantilever-shaped arm portion 1021 also elastically deforms downward. When the claw 114 passes over the guiding barrier portion 1022, the cantilever-shaped arm portion 1021 and the guiding blocking portion return to the original state, and the plane 10222 of the guiding blocking portion 1022 perpendicular to the plate-shaped arm portion 1021 can block the metal terminal 11 The counterclockwise direction, that is, the claw 114 is moved counterclockwise. Moreover, when the claw 114 passes over the guiding blocking portion 1022, the upper surface of the second extending portion 1143 of the claw 114 abuts against the lower surface 10132 of the bottom plate of the concave portion 101 of the base, so that the claw 114 is engaged with the base. Thereby, the metal terminal 11 is prevented from falling off. Further, the rotation fixing outer edge surface 116 of the flange 112 is engaged with the side wall of the concave portion 101, so that the rotation of the metal terminal in the clockwise direction is restricted.

9A to 9B are views when the shrapnel terminal 12 is schematically assembled. As shown in the figure, the spring piece terminal 12 is placed above the metal terminal 11 in such a manner that the first bent portion 122 and the second bent portion 123 of the elastic piece terminal 12 respectively correspond to the two cutout portions 103, and then the elastic piece is The terminal 12 is pressed into the base, and the barb 124 of the spring terminal 12 has an interference fit with the base to cause the inverted The lance 124 is snapped into the base to achieve the fixation between the shrapnel terminal 12 and the base. Thereby, it is possible to further prevent the metal terminal 11 from falling off by the elastic piece terminal 12. Further, the two projections 1212 provided on the main body portion 121 of the spring terminal 12 are respectively inserted into the first slits 115 provided in the flange 112 of the metal terminal 11, whereby the rotation of the metal terminal 11 can be further prevented.

10A to 10C are views when the screws are schematically assembled. As shown in the figure, the screw 13 with the washer 131 is inserted into the cylindrical portion 111 via the through hole 1211 provided in the spring terminal 12 and tightened, thereby completing the assembly of the terminal block.

In the present invention, the metal terminal 11 is not only fixed by the elastic terminal 12, but also the claw 114 of the metal terminal 11 is engaged with the base, thereby preventing the metal terminal 11 and the like from being pulled out from the base and falling off. It is possible to better prevent the metal terminal from being pulled out by using the shrapnel terminal to prevent the metal terminal or the like from being pulled out from the susceptor.

Further, when the metal terminal 11 is mounted, the metal terminal 11 is pressed with a small pressure (almost equal to 0), and the metal terminal 11 is rotated with a small torque, so that the claw of the metal terminal can be engaged with the base. This makes assembly very convenient.

In the present invention, two claws are provided on the metal terminal 11, but it is not limited thereto, and one, three or four or more claws may be provided. The claws may also be engaged without abutting against the bottom surface of the base, for example, the claws may be caught in the recess provided in the base to achieve the engagement. Further, the shape and the installation position of the claws 114 are not limited thereto, and various modifications may be made as long as they can be engaged with the susceptor.

Further, in the present invention, it is also possible to press the shrapnel terminal with a small force (almost equal to zero) without the interference fit of the shrapnel terminal and the base, and to prevent the pullout by using only the claw of the metal terminal.

Further, in the present invention, a bevel is provided on the flange of the metal terminal, and the bevel is locked to the side wall of the recess, whereby the metal terminal does not rotate in the clockwise direction even when the screw is strongly tightened. However, in the present invention, it is also possible not to provide a slope on the flange of the metal terminal, and to restrict the rotation of the metal terminal in the clockwise direction by only the claw.

Further, in the present invention, the metal terminal is rotated in the clockwise direction to engage the claw with the base, and the metal terminal may be rotated in the counterclockwise direction to engage the claw with the base.

The number of the second notch portions of the metal terminals and the protrusions of the elastic piece terminals is not limited to two, and may be one or three or more, and may not be provided, and the number of protrusions of the elastic piece terminals is equal to or smaller than the number of the second notch portions.

The present invention has been described above by way of embodiments, and the invention is not limited thereto, and various modifications can be made without departing from the spirit and scope of the invention.

11‧‧‧Metal terminals

111‧‧‧Cylinder

112‧‧‧Flange

113‧‧‧Second incision

114‧‧‧Claws

1141‧‧‧Bend

1142‧‧‧First Extension

1143‧‧‧Second extension

115‧‧‧ first incision

116‧‧‧Rotating fixed rim surface

Claims (10)

An electronic device having a terminal block having a base, a screw, a fixing member of a fixing screw, and a spring piece terminal, the elastic piece terminal having electrical conductivity and having a through hole for passing the screw, and the elastic piece terminal Arranged between the head of the screw and the fixing member, wherein the fixing member has at least one claw that is engaged with the base, and the fixing member has an inner surface a first cylindrical portion having an internal thread and an annular flange provided at one end of the first cylindrical portion, and the flange is provided with a hook extending toward the other end side of the first cylindrical portion The claws. The electronic device of claim 1, wherein at least one first slit is provided on a flange of the fixing member, the spring terminal having a protrusion inserted into the flange provided on the flange Inside the first incision. The electronic device of claim 1, wherein the base is formed with a recess, a bottom plate of the recess is formed with a cutout portion and a circular through hole, and the first cylindrical portion of the fixing member is inserted into the a flange of the fixing member is placed on an upper surface of the bottom plate of the recess, the claw is inserted into the cutout portion, and the claw is rotated by the rotation of the fixing member The base is engaged. The electronic device of claim 3, wherein the through hole is coaxial on a lower surface of the bottom plate of the recess a second cylindrical portion is integrally formed with the bottom plate, and at least one cantilever-shaped arm portion is formed on an outer circumferential surface of the second cylindrical portion, and is disposed on an upper surface of the bottom portion of the arm portion a protrusion that is elastically deformable, that is, a guide stopper having a plane extending from an upper surface of the arm toward a front end of the protrusion and parallel to a central axis of the second cylindrical portion and from the arm The upper surface extends toward the front end of the protrusion and gradually approaches the inclined surface of the plane, and the plane phase advances in a direction in which the claw advances in a direction of engagement with the base when the fixing member rotates More forward than the inclined surface, the inclined surface guides advancement of the claw when the claw advances in a direction of engagement with the base by rotation of the fixing member, the plane being After the claw is engaged with the base, the claw is prevented from moving in a direction opposite to the advancing direction. The electronic device of claim 4, wherein the claw has an inclined surface inclined along an inclined surface of the guiding barrier at a position which is both a front end extending toward the other end side and a front side in the forward direction When the claw advances in a direction of engagement with the base by the rotation of the fixing member, the inclined surface of the claw is guided by the inclined surface of the guiding stopper. The electronic device of claim 4, wherein the inner diameter of the through hole is larger than the inner diameter of the second cylindrical portion. The electronic device of claim 4, wherein the claw is caught on a lower surface of the bottom plate of the recess. The electronic device of claim 4, wherein the arm portions are respectively disposed at two opposite positions of the second cylindrical portion, and the guiding blocking portions are respectively disposed on each of the arm portions, The hook-shaped claws are respectively provided at opposite positions of the flange of the fixing member. The electronic device according to any one of claims 1 to 8, wherein, on the flange of the fixing member, the claw is rotated when the fixing member is rotated with respect to a position where the claw is provided a second slit is provided on a forward direction side advancing in a direction in which the base is engaged, and an outer peripheral edge of the flange has an annular outer peripheral surface and a rotationally fixed outer peripheral surface, the annular outer peripheral surface a distance from the central axis of the flange is constant, the distance of the rotation fixed outer edge surface from the central axis gradually decreases from the central axis along the annular outer edge as the second slit is approached The length is increased, and when the claw is engaged with the base, the rotation fixing outer edge surface is locked with the side wall of the recess. The electronic device of any one of claims 1 to 8, wherein the fixing member is made of metal.