JP5806091B2 - Switch device - Google Patents

Description

  The present invention relates to a switch device, and more particularly to a switch device using a magnet and a magnetic detector.

  2. Description of the Related Art A detection device for detecting whether or not a tongue plate is inserted into a buckle body is provided in a buckle device that removably fixes a tongue plate provided on a seat belt of a vehicle. As an example of this type of detection device, there is a state detection device in which a magnetic detector detects insertion of a tongue plate by the approach of a permanent magnet (see, for example, Patent Document 1).

  In the state detection device described in Patent Document 1, a slide portion that moves by inserting a tongue plate and a permanent magnet that moves in conjunction with the slide portion are assembled inside a cylindrical housing and mounted on a substrate. The mounted magnetic detector is configured as a detector unit assembled in the vicinity of the permanent magnet of the housing. This detector unit is assembled inside the buckle body.

JP 2011-98668 A

  The state detection device described in Patent Document 1 has a configuration in which a magnetic detector assembled to a substrate is assembled to a housing in which a slide portion and a permanent magnet are assembled. Therefore, assembly error when assembling the magnetic detector on the board, assembly error when assembling the slide part and permanent magnet inside the housing, and assembly error when assembling the magnetic detector assembled on the board to the housing Are easy to accumulate. Therefore, in order to ensure the feasibility as the state detection device, it is necessary to manage the assembly error of these members.

  An object of the present invention is to provide a switch device that can reduce an integration error of assembly components.

[1] The present invention relates to a magnet moving body having magnets, a magnetic detector for detecting movement of the magnet moving body, and a mounted member for mounting the magnetic detector along the advancing / retreating movement path of the magnet moving body. The magnetic detector is attached to the attached member as an upper cover of the magnet moving body, and a space formed between the bottom surface of the attached member and the lower surface of the magnetic detector is The switch device is set as a moving space of a magnet moving body, and the magnetic detector and the magnet moving body are assembled from above the bottom surface of the attached member .

[2] In the invention described in [1], wherein, before Symbol moving space is provided with a guide portion for guiding the magnet moving body along between said the mating member and the magnetic detector, the magnetic A detector is attached to the guide part.

[3] In the invention described in [2 ] above, the guide portion is configured by a pair of guide rails formed on the mounted member.

  According to the switch device of the present invention, it is possible to reduce the integration error of the assembled components, and it is possible to ensure the detection accuracy of the magnetic detector.

1 is an exploded perspective view schematically showing a switch device and a lower cover of a buckle device according to a preferred embodiment of the present invention. It is the arrow directional cross-sectional enlarged view of the II-II line | wire in FIG. 1 of the state which mounted | wore with the switch apparatus which concerns on embodiment. It is a figure for demonstrating the relationship between the output current output from the magnetic detector which concerns on embodiment, and the position of the magnet moving body with respect to a magnetic detector.

  Preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings.

(Configuration of switch device)
In FIG. 1, reference numeral 1 generally indicates a typical switch device according to this embodiment. The switch device 1 according to the illustrated example is not particularly limited, but is suitably used for a buckle switch of a seat belt device of an automobile, for example. The seat belt device is configured in the same manner as a generally used one, and the description thereof is omitted.

  As shown in FIG. 1, the switch device 1 is accommodated in a resin lower cover 2 that is a member to be attached. The lower cover 2 has an opening 2a opened upward, and a predetermined cylindrical body is formed by superimposing an opening of an upper cover of a buckle device used in a seat belt device having a known configuration on the opening 2a. It is formed into a shape. On one side of the lower cover 2 is formed an end opening 2b that is a tongue insertion port in a state of being overlapped with the opening of the upper cover, and on the other side is an anchor in a state of being overlapped with the opening of the upper cover. An end opening 2c serving as an insertion port is formed.

  As shown in FIG. 1, the switch device 1 includes a magnet moving body 3 that is movably disposed in the lower cover 2 and a magnetic detector 5 that detects the movement of the magnet moving body 3. It is configured as a contact type switch device.

(Configuration of magnet moving body)
As shown in FIG. 1, the magnet moving body 3 is formed in a rectangular parallelepiped shape in which a magnetic field generating member is molded with a sealing resin. The magnetic field generating member is made of, for example, a permanent magnet or an electromagnet. A horizontal plate-like arm portion 3 a extends on one side of the magnet moving body 3. The arm 3a is connected to an ejector for releasing the lock state of the tongue plate when the tongue plate of the seat belt (not shown) is pulled out from the buckle device.

  As shown in FIG. 1, a coil spring is provided in a spring accommodating space 7a formed between the end surface portion of the magnet moving body 3 on the advancing movement side and the standing wall portion of the lower cover 2 on the side facing the end surface portion. 4 is installed. This magnet moving body 3 is configured to move in the tongue plate insertion direction against the elasticity of the coil spring 4 by an ejector that moves in conjunction with the tongue plate. When the tongue plate is removed from the buckle device, the coil spring 4 It is configured to return to the initial position before insertion of the tongue plate by the elastic return force.

(Configuration of magnetic detector)
As shown in FIG. 1, one of the magnetic detectors 5 is a rectangular parallelepiped packaged by resin-molding a magnetosensitive element (magnetic sensor chip) and an IC mounted on a pair of lead frames by wire bonding. It is formed into a shape. The lead frame is connected to the harness terminal via the connection terminal 6. The magnetosensitive element includes a magnetoresistive element that detects a change in the direction of a magnetic vector due to a magnetic field generated from a magnet, a Hall element that detects a change in the strength of the magnetic field, and the like.

  As shown in FIGS. 1 and 2, one basic configuration of the switch device 1 configured as described above is a magnetic detector facing surface 2 f (hereinafter referred to as “bottom surface 2 f”) serving as a bottom surface of the lower cover 2. And the space formed between the lower cover facing surface 5a (hereinafter referred to as “lower surface 5a”) which is the lower surface of the magnetic detector 5 is set as a moving space 7 for moving the magnet moving body 3. It is in. Another basic configuration of the switch device 1 is that the main body of the magnetic detector 5 is configured as an upper cover of the magnet moving body 3.

  As shown in FIGS. 1 and 2, a pair of guide rails 2 d and 2 e are formed on the bottom surface 2 f of the lower cover 2 so as to face each other along the advancing / retreating movement path of the magnet moving body 3. The pair of guide rails 2d and 2e is configured as a slider sliding portion that is a guide portion that guides and moves the magnet moving body 3 between the bottom surface 2f of the lower cover 2 and the lower surface 5a of the magnetic detector 5. .

  Of the pair of guide rails 2d and 2e, the guide rail 2d disposed on the opposite side of the arm 3a of the magnet moving body 3 is, as shown in FIGS. 1 and 2, from the height and width of the guide rail 2e. Has a large rib shape, and a fixed area of the magnetic detector 5 is secured. The guide rail 2e disposed on the arm 3a side of the magnet moving body 3 has a rib shape in which the height and width are set smaller than those of the guide rail 2d, and the movement of the arm 3a of the magnet moving body 3 is performed. Is allowed.

  As shown in FIGS. 1 and 2, the upper end surface of the guide rail 2d is a fixing surface to which a part of the lower surface 5a of the magnetic detector 5 is attached by fixing means such as adhesion or welding. The lower surface 5a of the magnetic detector 5 is configured as an upper cover of the magnet moving body 3, and the assembly structure of the switch device 1 with respect to the lower cover 2 is simplified. The configuration in which the packaged magnetic detector 5 is attached to the lower cover 2 as an upper cover in the slider sliding portion of the magnet moving body 3 prevents the magnet moving body 3 from coming out of a predetermined installation site of the lower cover 2.

  According to the switch device 1, when inserted from the end opening 2 b on the tongue insertion port side of the lower cover 2 in the seat belt device having a known configuration, the tip end portion of the tongue plate comes into contact with and presses the ejector, and the coil spring 4 is pressed by the ejector. The magnet moving body 3 is moved along the guide rails 2d and 2e of the lower cover 2 against the urging force. One magnetic detector 5 detects the insertion of the tongue plate by the approach of the magnet of the magnet moving body 3 and outputs the detection result to the electronic control unit (ECU) via the connection terminal 6.

  Here, referring to FIG. 3, the relationship between the output current I output from the magnetic detector 5 and the position X of the magnet moving body 3 with respect to the main body of the magnetic detector 5 is shown.

In the graph shown in FIG. 3, the position X shown on the horizontal axis is X = 0 when the magnet moving body 3 is located at one end of the magnetic detector 5, and the magnet moving body 3 is moved from one end of the magnetic detector 5. The direction of movement to the other end is the detection output switching point. The output current I output from the magnetosensitive element of the magnetic detector 5 is set so as to switch between the Hi output I ₁ and the Lo output I _{2 as} the magnet moving body 3 moves.

Although not particularly limited, the electronic control unit determines whether the magnetic detector 5 is in the set on state or in the off state based on the output current I. In the illustrated example, when the output current I is the Hi output I ₁ , it is turned on, and when the output current I is the Lo output I ₂ , it is turned off.

(Effect of embodiment)
According to the switch device 1 configured as described above, the following effects can be obtained in addition to the above effects.

(Improved feasibility)
Since the packaged magnetic detector 5 is attached to the lower cover 2 as an upper cover in the slider sliding portion of the magnet moving body 3, the number of components of the switch device 1 can be reduced. In addition, an assembly error (tolerance) for the lower cover 2 can be reduced. The assembly variation can be effectively reduced, and the establishment of the contactless switch device 1 can be improved.

(Improvement of assembly and simplification of mold)
The magnet moving body 3 and the magnetic detector are eliminated by eliminating the structure of the above-described conventional switch device in which a plurality of constituent members composed of the slide part and the magnet assembly and the magnetic detector mounted on the substrate are assembled in the lower cover. Since the two members 5 and 5 are assembled in the lower cover 2, the components of the switch device 1 are assembled only from the upper side of the bottom surface of the lower cover 2 in the manufacturing process. Can be improved. In addition, the structure of the lower cover for assembling the switch device 1 is simple, and the structure of the lower cover molding die can be simplified.

(Magnet miniaturization)
Since the conventional switch structure in which the slide portion and the permanent magnet are assembled to the housing or the magnetic detector mounted on the substrate is eliminated, the magnet of the magnet moving body 3 and the magnetic detector 5 are eliminated. The gap between the magnetic sensor chip and the magnetic sensor chip can be set small, and a magnetic flux density that is practically satisfactory is obtained. Since a sufficient magnetic flux density can be obtained, it becomes difficult to be affected by a disturbance magnetic field, and the number of shield members can be reduced.

(Reduction of the number of parts)
By adopting a configuration in which the packaged magnetic detector 5 is attached to the lower cover 2 as an upper cover of the slider sliding portion in the magnet moving body 3, the number of components of the switch device 1 can be reduced compared to the conventional switch device. can do.

(Switch device miniaturization)
By adopting the packaged magnetic detector 5, the size of the switch device 1 can be set small.

[Modification]
As described above, the typical configuration example of the switch device 1 according to the present invention has been described with reference to the embodiment and the illustrated example. However, the above embodiment and the illustrated example limit the invention according to the claims. is not. Various configurations are possible within the scope of the technical idea of the present invention, and the following modifications are also possible.

  The pair of guide rails 2d and 2e of the lower cover 2 is not particularly limited as long as the guide rails 2d and 2e have a structure as a guide portion that can move and guide the magnet moving body 3 to the bottom surface 2f of the lower cover 2. . As another example of the guide portion, various structures having stepped portions such as concave portions and convex portions formed on the bottom surface 2f of the lower cover 2 can be employed.

  As yet another example of this guide portion, for example, a pair of leg portions projecting along the advancing / retreating movement path of the magnet moving body 3 at the edge portions on both sides of the lower surface 5a of the magnetic detector 5, The space between the pair of legs may be set as a moving space 7 for moving and guiding the magnet moving body 3. Therefore, as the guide unit, the form and the arrangement position are not particularly limited as long as the guide unit has a structure in which the main body of the magnetic detector 5 can be attached as the upper cover of the magnet moving body 3. Of course, it can be selected.

  In the above embodiment and the illustrated example, the lower cover 2 is a cover body of a buckle device that removably fixes a tongue plate provided on a vehicle seat belt. Is an example of the switch device 1 configured to reciprocate in the moving space 7 with respect to the magnetic detector 5, but is not limited thereto.

  The switch device 1 according to the present invention includes various types such as a contactless lever switch device that operates the magnet moving body 3 by lever operation and a contactless press button switch device that operates the magnet moving body 3 by pressing button operation. And can be effectively used as a switch device for electronic devices other than vehicles such as automobiles.

  As is clear from the above description, not all the combinations of the features described in the above-described embodiments, modifications, and illustrated examples are necessarily essential to the means for solving the problems of the present invention. It should be noted.

DESCRIPTION OF SYMBOLS 1 ... Switch apparatus, 2 ... Lower cover, 2a ... Opening, 2b, 2c ... End opening, 2d, 2e ... Guide rail, 2f ... Magnetic detector opposing surface, 3 ... Magnet moving body, 3a ... Arm part, 4 ... Coil spring 5 ... Magnetic detector, 5a ... Lower cover facing surface, 6 ... Connection terminal, 7 ... Moving space, 7a ... Spring accommodating space

Claims (3)

A magnet moving body having a magnet;
A magnetic detector for detecting movement of the magnet moving body;
A mounting member for mounting the magnetic detector along an advancing / retreating movement path of the magnet moving body,
The magnetic detector is attached to the mounted member as an upper cover of the magnet moving body, and a space formed between the bottom surface of the mounted member and the lower surface of the magnetic detector is a moving space of the magnet moving body. The switch device is characterized in that the magnetic detector and the magnet moving body are assembled from above the bottom surface of the attached member . The moving space includes a guide portion that guides the magnet moving body between the mounted member and the magnetic detector,
The switch device according to claim 1 , wherein the magnetic detector is attached to the guide portion. The switch device according to claim 2 , wherein the guide portion includes a pair of guide rails formed on the attached member.

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