JP6110809B2 - Seat belt buckle device - Google Patents

Description

  The present invention relates to a seat belt buckle device capable of detecting attachment / detachment of a tongue plate.

  In recent years, a seat belt buckle device (hereinafter referred to as a buckle device) with a buckle switch capable of detecting whether or not a passenger is wearing a seat belt has been developed. The buckle switch can electrically or mechanically notify the vehicle whether or not the seat belt has been attached or removed by the occupant. For example, automatic adjustment of the deployment output of the airbag, automatic control of a retractor with a motor that winds the seat belt, etc. It is used for.

  The main buckle switch actually detects the attachment / detachment of the tongue plate. For example, Patent Document 1 discloses a non-contact buckle switch that uses a magnet and a Hall element. This buckle switch is interlocked with a lock pin (lock bar) that moves according to the insertion and removal of the tongue plate, and the hall element (magnetic sensitive element) moves when the arm is pushed by the lock bar. It has become. Then, the attachment / detachment of the tongue plate is determined based on the position of the Hall element. According to the buckle switch of Patent Document 1, unlike a conventional contact-type buckle switch, there is no fear of wear of contact portions and the like, and durability is improved.

JP 2001-157603 A

  The current buckle device, like other on-vehicle devices, is required to have higher functions and lower costs. In order to do so, it is very effective to devise the downsizing of the internal structure of the buckle device including the buckle switch described above.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a seat belt buckle device that can detect attachment / detachment of a tongue plate and can contribute to downsizing of an internal structure.

  In order to solve the above problems, a representative configuration of a seat belt buckle device according to the present invention is a seat belt buckle device capable of detecting attachment / detachment of a tongue plate, and the tongue plate is inserted into the seat belt back device. A magnetic sensing element that is installed with a predetermined gap between the magnet and the magnet to be installed in the outer package, and outputs a predetermined signal according to the magnetic flux density received from the magnet, An ejector that is installed and slides in conjunction with insertion and removal of the tongue plate, and a shielding plate that is provided on the ejector and that has a shielding region that changes the magnetic flux density by entering and exiting the gap in conjunction with the slide. And a guide portion that extends along the locus of the shielding area from the gap and guides the shielding area to enter and exit the gap. And butterflies.

  In the buckle device, the detachment of the tongue plate is detected by installing a shielding plate on the ejector and monitoring the movement of the shielding plate using a magnet and a magnetically sensitive element. And in the said structure, a guide part can guide the shielding area | region of a shielding plate, and can approach a shielding area | region toward the gap | interval of a magnetic sensitive element and a magnet accurately. Although the shielding area plays a role of changing the magnetic flux from the magnet to the magnetic sensing element, even if the shielding area and the shielding plate have a smaller shape as long as the shielding area can be accurately entered into the above-described gap. Can play a role. Therefore, according to the above configuration, the buckle switch structure including the shielding plate can be reduced in size, and further, the seat belt buckle device can be reduced in size.

  The shielding area of the shielding plate has a long plate shape linearly extending along the ejecting direction of the ejector, and the guide portion includes an upper surface extending along one plane of the shielding area, and the shielding area. You may have the holding | grip part which protruded in the L shape from the upper surface part along each side edge of the width direction both sides. If it is this structure, the shielding area | region of a shielding plate will slide inside the upper surface part of a guide part, and a holding part, and a shielding area | region can be guide | induced accurately toward a clearance gap.

  The guide portion may further include a protrusion that protrudes toward one plane of the shielding region and interferes with one plane at an end portion of the upper surface portion opposite to the gap. Since the projection portion slightly presses the shielding area, the shielding area can be prevented from swinging and smoothly slid. The pressing at this time may be slight. The noise of the magnetically sensitive element is also reduced by reducing the perturbation of the shielding area and the so-called rattling.

  The guide portion may further include two slits formed in a predetermined range through both sides of the protruding portion from the end portion of the upper surface portion toward the gap. The protrusion can be bent by forming slits on both sides, and the shielding area can be pressed with an appropriate force that does not disturb the slide.

  The guide portion may have a shape that extends to a position that covers the shielding region farthest away from the gap. That is, the guide portion may be configured to always cover most of the shielding area (long plate shape) of the shielding plate before and after the ejector slides. With this configuration, the shield area does not fall off from the inside of the guide portion, and the shield area can be guided more accurately toward the gap. In addition, since the shielding area is always covered with the guide portion, it is possible to prevent dust from adhering to the shielding area and improve durability.

  The magnet, the magnetic sensitive element, and the guide part may be unitized as a switch body part. According to this configuration, it is possible to realize a compact switch body and contribute to miniaturization of the internal configuration of the seat belt buckle device.

  The shielding plate may further include a hooking region that is bent from an end portion of the shielding region and passes through the ejector, and further bent and hooked on the ejector. According to this structure, a shielding plate can be installed in an ejector, without using separate members, such as pins. Moreover, it can contribute to the space-saving of the internal structure of a seatbelt buckle apparatus by not using another member.

  The ejector has a connection hole into which the hooking region of the shielding plate is inserted and hooked, and the connection hole and the hooking region have a predetermined range that allows the hooking region to move in the radial direction and the depth direction of the connection hole. It is desirable to have a shape that ensures play. For example, when there is almost no gap between the guide part and the shielding area that slides inside, and the shielding plate is fixed to the connection hole, the shielding area only has a slight molding error. The slide will be disturbed. However, if there is play between the connection hole and the hooking area of the shielding plate as in the above configuration, the play can move the installation position of the shielding plate and absorb molding errors, so that the shielding area can slide smoothly. Can be maintained. In other words, by providing play, it is possible to simultaneously reduce the size of the guide portion and the shielding area by reducing the size, and to improve the detection accuracy by maintaining a smooth slide of the shielding area.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the seatbelt buckle apparatus with the attachment / detachment detection function which can achieve size reduction of an internal structure.

1 is a perspective view illustrating a seat belt buckle device according to an embodiment of the invention. It is a disassembled perspective view of the seatbelt buckle apparatus of FIG. It is the figure which illustrated the process of the ejector of FIG. It is the figure which illustrated the process of the ejector of FIG. It is the figure which illustrated the shielding plate of FIG.4 (b) independently. It is the figure which illustrated the guide part of Fig.4 (a) from each direction. It is DD sectional drawing of the guide part of Fig.6 (a).

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  FIG. 1 is a perspective view illustrating a seat belt buckle device (hereinafter referred to as a buckle device 100) according to an embodiment of the invention. The buckle device 100 is a device that fixes a tongue plate 102 provided on a seat belt. The buckle device 100 can fix the tongue plate 102 simply by inserting the tongue plate 102 into the insertion port 104, and can release the tongue plate 102 simply by pressing the release button 106. The buckle device 100 is mainly installed in the passenger compartment so as to be positioned in the vicinity of the waist of the occupant seated in the seat.

  FIG. 2 is an exploded perspective view of the seat belt buckle device 100 of FIG. Hereinafter, an outline of the internal configuration of the buckle device 100 will be described. The exterior of the buckle device 100 includes an upper case 108 and a lower case 110. The upper case 108 is provided with an opening 112. A release button 106 is installed in the opening 112, and an insertion port 104 (see FIG. 1) is formed below the release button 106.

  A metal frame 114 is installed inside the exterior. The frame 114 is a base part of the internal structure of the buckle device 100. The frame 114 includes a pair of side walls 116a and 116b and a bottom portion 118 between the side walls 116a and 116b. The upper surface of the bottom portion 118 constitutes an insertion path for the tongue plate 102 in the buckle device 100.

  A latch member 120 is installed on top of the side walls 116 a and 116 b of the frame 114. The latch member 120 is a member that is connected to the tongue plate 102 and fixes the same. The latch member 120 rotates in conjunction with the insertion of the tongue plate 102 into the exterior, and the latch protrusion 122 is inserted into the latch hole 124 of the tongue plate 102 and fastened. An opening region 126 is provided in the center of the latch member 120. A spring latching convex portion 128 is provided at the edge of the opening region 126, and an ejector spring 130 described later is connected to the spring latching convex portion 128.

  An ejector 132 is slidably installed on the bottom 118 of the frame 114. The ejector 132 has arm portions 134 a and 134 b protruding beyond the width of the frame 114, and the arm portion 134 a is installed through the slit 136. The ejector 132 mainly functions when the tongue plate 102 is pulled out. When the release button 106 is pressed, the ejector 132 uses the force of the ejector spring 130 to eject the tongue plate 102 from the exterior.

  A cantilever 138 is connected to the ejector 132. The cantilever 138 plays a role of pushing down the lock bar 140. The cantilever 138 is connected to the ejector 132 at the hinge 142 so that the end 144 passes through the opening region 126 of the latch member 120 and protrudes upward. The end 144 is formed in a shape that engages with the lock bar 140. When the tongue plate 102 is inserted and the ejector 132 moves to the back of the exterior, the cantilever 138 rotates toward the opening 112 around the hinge 142 using the repulsive force of the ejector spring 130, and the lock bar 140 Press down.

  The lock bar 140 is longer than the width of the frame 114, and is installed over the L-shaped L-shaped hole portions 146 of the side walls 116 a and 116 b of the frame 114 above the latch member 120. The lock bar 140 is pushed down by the above-mentioned cantilever 138 when the tongue plate 102 is inserted. Then, the latch member 120 is pushed down by the lock bar 140, and the latch protrusion 122 is inserted into the latch hole 124 of the tongue plate 102.

  The lock bar 140 with the latch member 120 pushed down moves to the front end 148 (opening 112 side) of the L-shaped hole 146. When the lock bar 140 enters the front end 148, the latch member 120 cannot move upward (in a direction away from the bottom portion 118), and the latch member 120 is fixed in a state of being connected to the tongue plate 102. In this way, the connection between the buckle device 100 and the tongue plate 102 is completed.

  The ejector spring 130 is installed between the latch member 120 and the cantilever 138. The ejector spring 130 is installed in a compressed state, and always generates a repulsive force in a direction to separate the latch member 120 and the cantilever 138 from each other. The repulsive force of the ejector spring 130 is used to push down the lock bar 140 by the cantilever 138 described above.

  The release button 106 is installed on the opening 112 side of the frame 114 so as to be slidable to the back side in the exterior. The release button 106 releases the connection between the latch member 120 and the tongue plate 102. More specifically, when the release button 106 is pressed, the lock bar 140 is pushed deep inside the exterior and moves from the front end 148 of the L-shaped hole 146. Thereby, the latch member 120 fixed by the lock bar 140 is released, and the connection between the buckle device 100 and the tongue plate 102 is released.

  When the release button 106 moves the lock bar 140 to the back, the ejector 132 is also activated. Specifically, as the lock bar 140 moves toward the upper end 150 of the L-shaped hole 146, the cantilever 138 gradually rises. As the cantilever 138 rises, the latch member 120 is lifted by the ejector spring 130 from below and removed from the tongue plate 102. When the cantilever 138 reaches a certain point in time, the repelling force of the ejector spring 130 is applied toward the hinge part 142 side of the cantilever 138, and the ejector 132 slides to the opening 112 side together with the cantilever 138 by the repulsive force. To do. The tongue plate 102 is discharged from the insertion port 104 (see FIG. 1) by the slide of the ejector 132.

  The counterweight 152 is a member that plays a role of a weight with respect to the release button 106. The counterweight 152 is rotatably installed on the release button 106 by a hinge 154. The counterweight 152 rotates when an inertial force is applied to the release button 106 to cancel the inertial force, and prevents the release button 106 from moving in the release direction. By installing the counterweight 152, it is possible to prevent unexpected release of the tongue plate 102.

  The buckle device has a so-called buckle switch function, and can electrically notify the vehicle side whether or not the occupant has worn the seat belt. The buckle switch mainly includes a switch main body 160 and a shielding plate 162. The switch main body 160 is installed outside the side wall 116 a of the frame 114, and monitors the slide of the ejector 132 through the shielding plate 162. The shielding plate 162 is installed on the ejector 132 and slides inside the switch main body 160.

  FIG. 3 is a diagram illustrating a process of sliding the ejector 132 of FIG. Hereinafter, the components of the buckle device 100 will be further described focusing on the buckle switch function. FIG. 3A is a diagram illustrating the ejector 132 when the seat belt is not attached. 3A and 3B, the side wall 116a (see FIG. 2) on the front side of the frame 114 in the drawing is omitted. When the seat belt is not attached, the ejector 132 is pushed by the ejector spring 130 (see FIG. 2) and moves to the opening 112 side.

  FIG. 3B illustrates the ejector 132 when the seat belt is worn. When the occupant wears the seat belt, the tongue plate 102 is inserted into the insertion port 104 (see FIG. 1) of the buckle device 100. The ejector 132 is pushed into the interior of the buckle device 100 by the tongue plate 102. Then, the arm part 134 a of the ejector 132 slides below the guide part 166 of the switch main body part 160. At this time, a part of the shielding plate 162 (see FIG. 3A) provided in the ejector 132 slides inside the guide portion 166. The switch body 160 detects the attachment / detachment of the tongue plate 102 by monitoring the movement of the shielding plate 162.

  FIG. 4 is a diagram schematically illustrating the buckle device 100 of FIG. 3A from another direction. FIG. 4A is a diagram schematically illustrating the buckle device 100 of FIG. 3A from above. As illustrated in FIG. 4A, the arm portions 134 a and 134 b of the ejector 132 are exposed to the outside from the side walls 116 a and 116 b of the frame 114. The shielding plate 162 is installed on the arm part 134a outside the frame.

  The switch body 160 has a base 164 and a guide 166 extending from the base 164. The base 164 includes a magnetic sensing element 168, a magnet 170, etc., which will be described later, inside the exterior. As described above, the shielding plate 162 slides toward the base portion 164 inside the guide portion 166.

  FIG.4 (b) is the arrow A figure of Fig.4 (a). As illustrated in FIG. 4B, a magnet 170 is installed in the lower portion of the base portion 164, and a magnetic sensitive element 168 (for example, a Hall element) is provided on the upper portion of the magnet 170. . The magnet 170 generates a magnetic field, and the magnetic sensing element 168 outputs a predetermined signal to the vehicle side according to the magnetic flux density from the magnet.

  A gap E1 is provided between the magnetic sensing element 168 and the shielding region 172 (see FIG. 5A) of the shielding plate 162 advances and retreats in the gap E1. As the shielding region 172 moves back and forth in the gap E1, the magnetic flux density received by the magnetic sensitive element 168 from the magnet 170 changes. The magnetic sensitive element 168 is configured to respond to the change in magnetic flux density and send a signal to the vehicle side in accordance with the change.

  The shielding plate 162 will be described. FIG. 5 is a diagram exemplarily showing the shielding plate 162 of FIG. FIG. 5A is a perspective view of the shielding plate 162. Most of the shielding plate 162 is a linear long plate-shaped shielding region 172, and a bent hooking region 174 is provided at the end of the shielding region 172. The shielding plate 162 is made of, for example, metal, and can change the magnetic flux density from the magnet 170 (see FIG. 4B). The shielding plate 162 is installed on the ejector 132 such that its longitudinal direction is along the sliding direction of the ejector 132.

  FIG. 5B is an arrow B view of the shielding plate 162 of FIG. The shielding plate 162 is installed such that the shielding region 172 extends linearly along the sliding direction of the ejector 132. The shielding region 172 moves forward and backward through the gap E1 (see FIG. 4B) of the switch main body 160 together with the slide of the ejector 132.

  The hooking area 174 is bent from the end of the shielding area 172. The hooking region 174 extends in an L shape from the shielding region 172 so as to extend to the opposite side of the sliding direction from the shielding region 172. As illustrated in FIG. 7, which will be described later, the hook region 174 has a posture bent through the arm portion 134 a of the ejector 132 and is hooked on the ejector 132. Since the shielding plate 162 is installed on the ejector 132 using the hooking region 174, it is not necessary to use another member such as a pin for installation.

  In the configuration using the hooking region 174, since no separate member such as a pin is used, space saving in the buckle device 100 can be achieved. In addition, there is no need for fastening work such as pins, which contributes to man-hour reduction. Further, by providing the connection hole 176 on the ejector 132 side with a margin with respect to the hooking region 174, it is possible to divert the common shielding plate 162 to buckle devices having different shapes.

  The configuration of the guide unit 166 will be described. FIG. 6 is a diagram illustrating the guide portion 166 of FIG. 4A from each direction. Fig.6 (a) is an enlarged view of the guide part 166 of Fig.4 (a). The buckle device in FIG. 6A illustrates a state in which the ejector 132 is moved most toward the opening 112 (see FIG. 2), but the guide 166 covers most of the shielding region 172 of the shielding plate 162. Since it covers, the shielding plate 162 is not so exposed in FIG.

  FIG. 6B is a cross-sectional view taken along the line C-C in FIG. As illustrated in FIG. 6B, the guide portion 166 extends along the upper surface portion 178 extending along one plane of the shielding region 172 of the shielding plate 162 and the side edges on both sides in the width direction of the shielding region 172. And gripping portions 180a and 180b protruding in an L shape from the upper surface portion 178. The shielding region 172 of the shielding plate 162 slides inside the upper surface part 178 and the gripping parts 180a and 180b. In the present embodiment, the space surrounded by the upper surface portion 178 and the gripping portions 180a and 180b is packed so that a gap does not occur between the shielding region 172 as much as possible.

  An opening 182 is formed between the gripping portions 180a and 180b, and a hooking region 174 (see FIG. 6A) of the shielding plate 162 slides through the opening 182. With the guide portion 166 having these configurations, the shielding region 172 can be accurately guided toward the gap E1 (see FIG. 4B).

  FIG. 7 is a DD cross-sectional view of the guide portion 166 of FIG. The guide portion 166 extends linearly along the slide locus of the shielding region 172 from the gap E1 (see FIG. 4B). The shielding region 172 plays a role of changing the magnetic flux from the magnet 170 with respect to the magnetic sensing element 168 (see FIG. 4B). However, in the buckle device 100, the shielding region 172 enters the gap E1 with high accuracy and Since it can be interposed between the magnetically sensitive element 168, even the shield region 172 and the shield plate 162 which are reduced in size can play their roles without problems. That is, in the buckle device 100, the shielding plate 162 can be downsized and the guide portion 166 can be downsized, which can contribute to downsizing of the buckle device 100 and the like.

  As illustrated in FIG. 4B, in this embodiment, as the switch main body 160, the magnet 170, the magnetic sensitive element 168, and the guide 166 are integrally unitized. In combination with the above-described downsizing of the shielding plate 162, the present embodiment allows a compact switch body 160 to be realized, thereby contributing to downsizing of the buckle device 100 and space saving of its internal configuration. Yes.

  The guide portion 166 has a shape that extends to a position that can cover the shielding region 172 in a state in which the ejector 132 is moved toward the opening 112 (see FIG. 2), that is, a state farthest from the gap E1. . Therefore, most of the shielding region 172 is always covered by the guide portion 166 before and after the ejector 132 slides. With this configuration, the shielding region 172 does not fall off from the inside of the guide portion 166, and the shielding region 172 can be guided more accurately toward the gap E1. If the shielding area 172 is always covered with the guide portion 166, dust can be prevented from adhering to the shielding area 172, and the durability of the buckle switch function is improved.

  Reference is again made to FIG. As illustrated in FIG. 6A, two slits 184 extend in the direction of the gap E1 at the end portion of the upper surface portion 178 of the guide portion 166 opposite to the gap E1 (see FIG. 4B). Is provided. A projection 186 illustrated in FIG. 7 is provided between the slits 184.

  The protrusion 186 protrudes toward one plane (upper surface 188) of the shielding region 172 of the shielding plate 162 and interferes with the upper surface 188. As described above, the slits 184 (see FIG. 6A) are formed in a predetermined range on both sides of the protrusion 186. The protrusion 186 can be bent because the slits 184 are formed on both sides, and slightly presses the upper surface 188 with an appropriate force that does not interfere with the sliding of the shielding plate 162. When the projection 186 presses the upper surface 188, the projection 186 can be smoothly slid while suppressing the swinging of the shielding plate 162 and so-called rattling. Moreover, the noise of the magnetic sensitive element 168 is also reduced by suppressing the swinging of the shielding plate 162 and the like.

  In the present embodiment, a predetermined play that allows the hooking region 174 to move in the radial direction and the depth direction of the connecting hole 176 is provided between the connecting hole 176 of the ejector 132 and the hooking region 174 of the shielding plate 162. Clearance is secured. In other words, the connection hole 176 and the hooking region 174 have a shape that can secure play between them.

  For example, as a configuration different from the present embodiment, there is almost no gap between the guide portion 166 and the shielding region 172 that slides inside the guide portion 166, and in addition, the shielding plate 162 is fixed to the connection hole 176. Even if a slight error in molding occurs, the shielding area 172 greatly interferes with the inside of the guide portion 166, and smooth sliding of the shielding area 172 is hindered. Therefore, in this embodiment, play is provided between the connection hole 176 and the hooking region 174. If there is play at this location, the installation position of the shielding plate 162 relative to the ejector 132 moves. Then, even if a molding error occurs, since the error can be absorbed by the movement of the shielding plate 162, interference of the shielding region 172 to the inside of the guide portion 166 is suppressed, and the shielding region 172 can be smoothly slid. Can be maintained.

  Further, by providing play between the connection hole 176 and the catching region 174, it is possible to reduce the size, for example, by reducing the dimensions of the guide portion 166 and the shielding region 172 without excessively obtaining molding accuracy. become. In addition, since smooth sliding of the shielding area 172 can be maintained due to the play, the gap between the magnet 170 and the magnetic sensitive element 168 in FIG. Thus, it is possible to improve the detection accuracy by reducing the room where the shielding region 172 is displaced.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings. However, the embodiments described above are preferred examples of the present invention, and other embodiments can be implemented by various methods. Can be carried out. The invention is not limited to the detailed shape, size, configuration, and the like of the components shown in the accompanying drawings unless otherwise specified in the present specification. In addition, expressions and terms used in the present specification are for the purpose of explanation, and are not limited thereto unless otherwise specified.

  Therefore, it is obvious for those skilled in the art that various changes and modifications can be conceived within the scope of the claims, and these naturally belong to the technical scope of the present invention. It is understood.

  The present invention can be used for a seat belt buckle device capable of detecting attachment / detachment of a tongue plate.

E1: gap between magnet and magnetic sensing element, 100: buckle device, 102: tongue plate, 104 ... insertion port, 106 ... release button, 108 ... upper case, 110 ... lower case, 112 ... opening of upper case, 114 ... Frame, 116a, 116b ... Frame side wall, 118 ... Bottom, 120 ... Latch member, 122 ... Latch projection of latch member, 124 ... Latch hole in tongue plate, 126 ... Open region of latch member, 128 ... Latch member 130 ... Ejector spring, 132 ... Ejector, 134a, 134b ... Ejector arm, 136 ... Frame slit, 138 ... Cantilever, 140 ... Lock bar, 142 ... Cantilever hinge, 144 ... Cantilever 146: L-shaped hole portion of the frame, 148: Front end of the L-shaped hole portion, 50 ... upper end of L-shaped hole, 152 ... counter weight, 154 ... hinge of counter weight, 160 ... switch body, 162 ... shielding plate, 164 ... base of switch body, 166 ... guide of switch body, 168 ... Magnetic sensing element, 170 ... Magnet, 172 ... Shielding area of shielding plate, 174 ... Hooking area of shielding plate, 176 ... Connector hole of ejector, 178 ... Upper surface part of shielding area, 180a, 180b ... Holding part of guide part, 182 ... Opening of guide part, 184 ... Slit of upper surface part of guide part, 186 ... Protrusion part of guide part, 188 ... Upper surface of shielding area

Claims (9)

A seat belt buckle device capable of detecting attachment / detachment of a tongue plate,
The seat belt buckle device
An exterior into which the tongue plate is inserted;
A magnet installed in the exterior;
A magnetic sensitive element that is installed with a predetermined gap between the magnet and outputs a predetermined signal according to a magnetic flux density received from the magnet;
An ejector that is installed in the exterior and slides in conjunction with the insertion and removal of the tongue plate from the exterior;
A shielding plate provided in the ejector, having a shielding region that changes the magnetic flux density by entering and leaving the gap in conjunction with the slide;
A guide portion extending from the gap along a locus of the shielding area of the shielding plate and guiding the shielding area to enter and leave the gap;
Equipped with a,
The shielding area of the shielding plate has a long plate shape extending linearly along the sliding direction of the ejector,
The guide portion has an upper surface portion that extends along one plane of the shielding region, and a grip portion that protrudes in an L shape from the upper surface portion along each side edge on both sides in the width direction of the shielding region. And
The guide portion further has a protrusion that protrudes toward the one plane of the shielding region and interferes with the one plane at an end of the upper surface portion opposite to the gap.
The guide portion further includes a seat belt, characterized in Rukoto to have a two slits formed in a predetermined range from the end portion of the upper surface through the both sides of the protrusion in the direction of the gap Buckle device. 2. The seat belt buckle device according to claim 1 , wherein the shielding plate further includes a hooking region that is bent from an end portion of the shielding region, passes through the ejector, and is further bent and hooked on the ejector. . The ejector has a connection hole into which the hooking region of the shielding plate is inserted and hooked,
3. The seat according to claim 2 , wherein the connection hole and the hooking region have a shape that secures a predetermined play that allows the hooking region to move in a radial direction and a depth direction of the connection hole. Belt buckle device. A seat belt buckle device capable of detecting attachment / detachment of a tongue plate,
  The seat belt buckle device
  An exterior into which the tongue plate is inserted;
  A magnet installed in the exterior;
  A magnetic sensitive element that is installed with a predetermined gap between the magnet and outputs a predetermined signal according to a magnetic flux density received from the magnet;
  An ejector that is installed in the exterior and slides in conjunction with the insertion and removal of the tongue plate from the exterior;
  A shielding plate provided in the ejector, having a shielding region that changes the magnetic flux density by entering and leaving the gap in conjunction with the slide;
  A guide portion extending from the gap along a locus of the shielding area of the shielding plate and guiding the shielding area to enter and leave the gap;
With
  The shielding plate further has a hooking region bent from the end of the shielding region and penetrating the ejector, and further bent and hooked on the ejector,
  The ejector has a connection hole into which the hooking region of the shielding plate is inserted and hooked,
  The seat belt buckle device according to claim 1, wherein the connection hole and the hooking region have a shape that secures a predetermined play that allows the hooking region to move in a radial direction and a depth direction of the connection hole. The shielding area of the shielding plate has a long plate shape extending linearly along the sliding direction of the ejector,
The guide portion includes an upper surface portion that extends along one plane of the shielding region, and a grip portion that protrudes in an L shape from the upper surface portion along each side edge on both sides in the width direction of the shielding region. The seat belt buckle device according to claim 4 . The guide portion further includes a projection portion protruding toward the one plane of the shielding region and interfering with the one plane at an end portion of the upper surface portion opposite to the gap. The seat belt buckle device according to claim 5 . The guide portion further to claim 6, characterized in that it comprises two slits formed in a predetermined range from the end portion of the upper surface through the both sides of the protrusion in the direction of the gap The described seat belt buckle device. The seat belt buckle device according to any one of claims 1 to 7 , wherein the guide portion has a shape extending to a position covering the shielding area farthest from the gap. The seat belt buckle device according to any one of claims 1 to 8 , wherein the magnet, the magnetically sensitive element, and the guide portion are unitized as a switch main body portion.

Images