sensor

Abstract

A sensor is provided, wherein even if a frame is divided and constructed, the end of a shielding film is not easy to roll up, and the manufacturability and noise tolerance are excellent. The sensor (1) comprises: a socket (9) that can be connected to an external plug (P); a second frame (3) that accommodates at least a portion of the socket (9); a main substrate (5) on which an electronic component (53) for sensing is mounted; a shielding film (6) that covers at least a portion of the main substrate (5) and shields at least one of electromagnetic waves emitted from the main substrate (5) and electromagnetic waves that attempt to invade the main substrate (5) from the outside; a first frame (2) that accommodates at least a portion of the main substrate (5) and at least a portion of the shielding film (6); a flexible substrate (8) that connects the main substrate (5) and the socket (9); and a protective member (10) that abuts against an end (62) of the shielding film (6) facing the flexible substrate (8) from the side opposite to the main substrate (5).

Description

Technical Field

[0001] The present invention relates to a sensor capable of being assembled by dividing a frame. Background Art

[0002] There is a connector-type sensor in circulation, which includes a socket (receptacle) and can load and unload a cable including a plug that is paired with the socket. In the case of a cable-integrated sensor, even if a main substrate on which electronic components for sensing are mounted is housed in a frame of an integral structure, the cable can be connected to the main substrate by performing assembly operations such as welding from the opening of the frame. On the other hand, in the case of a connector-type sensor, since the contact terminals of the socket connected to the main substrate are located deep inside the frame, it is difficult to perform operations such as welding if the frame is not divided and the contact terminals of the socket are exposed outside the frame.

[0003] For example, patent document 1 discloses a proximity sensor, which divides a cylindrical outer shell into a shell and a bracket shell, connects one end of a flexible substrate to a terminal pin of a socket housed in the bracket shell, connects the other end of the flexible substrate to the back side of a circuit substrate housed in the shell, and bends the flexible substrate to assemble the bracket shell to the shell.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2011-165323 Summary of the invention

[0007] Problems to be solved by the invention

[0008] However, there is a demand from the market to miniaturize (shorten) the size of the sensor. As the miniaturization of the sensor progresses, the free space in the frame becomes narrower. If the storage space of the flexible substrate overlaps with the storage space of the main substrate, the flexible substrate will interfere with the shielding film formed of metal foil or the like and covering the main substrate, so that when the divided frames are connected and the flexible substrate is folded, the end of the shielding film may be deformed in a rolled-up manner. If the shielding film is deformed, the tolerance (immunity) of the sensor to electromagnetic waves from the outside may be reduced.

[0009] Therefore, an object of the present invention is to provide a sensor in which the end portions of a shielding film are unlikely to be curled up even when a housing is divided into sections and which has excellent manufacturability and noise resistance.

[0010] Technical means of solving problems

[0011] A sensor according to one embodiment of the present disclosure includes: a socket that can be connected to an external plug; a second frame that accommodates at least a portion of the socket; a main substrate that has electronic components for sensing installed thereon; a shielding film that covers at least a portion of the main substrate and shields at least one of electromagnetic waves emitted from the main substrate and electromagnetic waves that attempt to invade the main substrate from the outside; a first frame that accommodates at least a portion of the main substrate and at least a portion of the shielding film; a flexible connecting member that connects the main substrate and the socket; and a protective member that abuts against the end of the shielding film facing the connecting member from the side opposite to the main substrate.

[0012] According to this form, the frame can be divided into a first frame and a second frame and assembled, so it is suitable for a connector-type sensor including a socket. If the frame is divided, when the second frame is assembled to the first frame, the connecting components such as the folded flexible substrate or cable may interfere with each other and cause the end of the shielding film to deform in a rolled-up manner. In this form, the shielding film can be prevented from being deformed by a protective component that abuts against the end of the shielding film from the side opposite to the main substrate. Therefore, a sensor can be provided in which the end of the shielding film is not easy to roll up even if the frame is divided and constructed, and the manufacturability and noise tolerance are excellent.

[0013] The above aspect may further include a sealing resin for sealing the electronic component for sensing, and the protection member may be a cantilever beam structure in which one end abuts against the end of the shielding film and the other end is buried and fixed in the sealing resin.

[0014] According to this aspect, the protective member is fixed to the sealing resin, so that even if a force is applied from the connecting member, the position of the protective member is unlikely to be displaced, thereby more reliably preventing the shielding film from rolling up.

[0015] In the above-mentioned form, it may also include: a cylindrical insulating member embedded in the second frame, and the shielding film has: a winding portion, which is wound around the main substrate along the short side direction intersecting the long side direction of the main substrate, and covers not only a part of the surface and a part of the back side of the main substrate, but also a part of the end face of the main substrate; and a tongue portion, which protrudes from the winding portion and only covers a part of the surface and / or a part of the back side of the main substrate, and at least a part of the tongue portion constitutes an end portion of the shielding film facing the connecting member, and overlaps with the insulating member in the thickness direction of the main substrate.

[0016] This form also includes: an insulating member that ensures an insulating withstand voltage distance from the inner peripheral surface of the second frame body to protect the connecting member from static electricity from the outside. The shielding film is trimmed in a manner that does not interfere with the insulating member, and a tongue portion is formed at the end facing the connecting member. The tongue portion is easier to roll up than the winding portion. If this form is adopted, by a protective member abutting against the tongue portion from the side opposite to the main substrate, deformation of the end of the shielding film can be prevented even if it is formed on the tongue portion that is easy to roll up.

[0017] In the above aspect, the protection member may be formed of a material having higher rigidity than the connection member.

[0018] According to this aspect, even when the protective member contacts the flexible connecting member, the protective member has high rigidity and is not easily deformed, so that deformation of the shielding film can be more reliably prevented.

[0019] In the above aspect, the protection member may be formed of a laminated board of FR-4 grade conforming to the American National Standards Institute (ANSI) standard.

[0020] According to this aspect, the protection member having higher rigidity than the connection member can be formed by using an easily available and inexpensive material.

[0021] A sensor according to another embodiment of the present disclosure includes: a main substrate on which electronic components for sensing are mounted; a shielding film covering at least a portion of the main substrate to shield at least one of electromagnetic waves emitted from the main substrate and electromagnetic waves intended to invade the main substrate from the outside; and a protective member abutting against an end of the shielding film from a side opposite to the main substrate. A sealing resin for sealing the electronic components for sensing may also be included. The protective member may also be a cantilever beam structure in which one end abuts against an end of the shielding film and the other end is buried and fixed in the sealing resin.

[0022] According to this aspect, deformation of the shielding film can be prevented by a protective member abutting against the end of the shielding film from the side opposite to the main substrate. For example, in a cable-integrated sensor, the shielding film can be prevented from being deformed in a rolled-up manner due to interference with the shielding film when the cable is installed.

[0023] Effects of the Invention

[0024] According to the present invention, it is possible to provide a sensor in which the end portions of the shielding film are unlikely to be curled up even when the housing is divided and which has excellent manufacturability and noise resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1It is a cross-sectional view showing the internal structure of a sensor according to one embodiment of the present invention.

[0026] Figure 2 Yes Figure 1 A perspective view of an exploded representation of the sensor shown.

[0027] Figure 3 Viewed from the back side of the main substrate Figure 1 A cross-sectional view of the shielding film and protective component is shown.

[0028] Figure 4 Yes means Figure 1 The cross-sectional view shows a state before the flexible substrate is folded.

[0029] Explanation of symbols

[0030] 1: Sensor

[0031] 2: First frame

[0032] 3: Second frame

[0033] 39: Airtight components

[0034] 4: Detection Department

[0035] 41: Core

[0036] 42: Coil

[0037] 43: Coil housing

[0038] 5: Main base board

[0039] 5A: Surface

[0040] 5B: Back

[0041] 5C: End face

[0042] 53: Electronic parts

[0043] 54: Installation

[0044] 6: Shielding film

[0045] 62: End facing the flexible substrate

[0046] 63: Winding section

[0047] 64: Tongue

[0048] 7: Insulation components

[0049] 8: Flexible substrate (an example of a connecting member)

[0050] 81: The other end

[0051] 82: One end

[0052] 83G, 83O: Light-emitting element

[0053] 84: Installation

[0054] 9: Socket

[0055] 90: Insulator

[0056] 91: Contact terminal

[0057] 10: Protect components

[0058] 101: The Other End

[0059] 102: One end

[0060] P: External plug

[0061] S1: Primary sealing resin (an example of sealing resin)

[0062] S2: Secondary sealing resin

[0063] X: Long side direction

[0064] Y: Short side direction

[0065] Z: thickness direction DETAILED DESCRIPTION

[0066] The preferred embodiments of the present invention are described with reference to the accompanying drawings. In addition, in each figure, the same reference symbol is marked with the same or similar structure. Figures 1 to 4 Each structure will be described in detail. Figure 1 1 is a cross-sectional view showing the internal structure of a sensor 1 according to an embodiment of the present invention. Figure 1 As shown, the sensor 1 is a connector-type sensor formed in a cylindrical shape, and includes a socket 9 configured to be connectable to an external plug P.

[0067] In the example shown in the figure, the sensor 1 is configured as a proximity sensor including a detection unit 4, and the detection unit 4 detects the presence or position of a metal body using a magnetic field. The sensor 1 is not limited to a proximity sensor, and may be an optical sensor including at least one of a light projecting unit that emits light and a light receiving unit that receives light as a detection unit, or may be other types of sensors.

[0068] The detection unit 4 is accommodated at one end (hereinafter referred to as the front end) of the sensor 1. A socket 9 is provided at the other end (hereinafter referred to as the bottom end) on the opposite side of the one end. The detection unit 4 includes a core 41 such as an iron core, a coil 42 as a winding wound on the core 41, and a coil housing 43 accommodating the core 41 and the coil 42, and is connected to a main circuit (5, 53, 54, 6, ...) that controls the detection unit 4.

[0069] The main circuit (5, 53, 54, 6, ...) includes a substantially rectangular main substrate 5, an electronic component 53 and a mounting portion 54 mounted on the main substrate 5, and a shielding film 6 formed of copper foil or the like. The electronic component 53 is connected to the detection portion 4 and is used for sensing. The mounting portion 54 is a pad pattern or a connector, etc., and is located on the opposite side of the detection portion 4 on the surface 5A of the main substrate 5, and is used for connection with the flexible substrate 8 described later.

[0070] Silicone resin or the like is applied to the surface 5A and the back surface 5B of the main substrate 5 to protect the electronic components 53. The shielding film 6 is wound around the main substrate 5 and fixed by a double-sided tape or the like. The shielding film 6 can shield electromagnetic waves and static electricity emitted from the main substrate 5, and can also shield electromagnetic waves and static electricity that attempt to invade the main substrate 5 from the outside.

[0071] The frame (2, 3) constituting the outer shape of the sensor 1 is formed of a material such as metal into a substantially cylindrical shape. The frame (2, 3) is configured to be divisible into a first frame 2 and a second frame 3. A primary sealing resin S1 such as epoxy resin is filled in at least a portion of the first frame 2. The primary sealing resin S1 fills the gap between the detection unit 4 and the main circuit (5, 53, 54, 6, ...) housed in the first frame 2 to fix them to each other.

[0072] The second frame 3 is filled with a secondary sealing resin S2 such as an epoxy resin similar to the primary sealing resin S1. The secondary sealing resin S2 fills the gaps between the parts housed in the second frame 3 and fixes them to each other. Furthermore, the secondary sealing resin S2 is filled across the first frame 2 and the second frame 3 to fix the first frame 2 and the second frame 3 to each other.

[0073] The first frame 2 and the second frame 3 are connected through a flexible substrate (flexible printed wiring board) 8. The flexible substrate 8 is an example of a flexible connecting member. The connecting member is not limited to the flexible substrate 8, and may also be a flexible cable or the like. The base film of the flexible substrate 8 is formed of a polyimide resin or the like with a thickness of less than 50 μ. The sensor 1 of the present embodiment includes a protective component 10 for protecting the shielding film 6 from being affected by the flexible substrate 8. Preferably, the protective component 10 is formed of a material having a higher rigidity than the flexible substrate 8. An example of the material of the protective component 10 is a laminate of FR-4 grade in accordance with ANSI specifications. In addition, the material of the protective component 10 may also be other types of rigid substrates, or may be a material other than a rigid substrate.

[0074] The protective member 10 is in contact with the shielding film 6 from the side opposite to the main substrate 5 on at least one of the surface 5A and the back surface 5B of the main substrate 5. In the illustrated example, the protective member 10 is arranged on the back surface 5B side and is adhered to the shielding film 6 by double-sided tape or the like. In the illustrated example, the protective member 10 is a cantilever beam structure in which one end (rear end) 102 is in contact with the end 62 of the shielding film 6 and the other end (front end) 101 is buried and fixed in the primary sealing resin S1. The primary sealing resin S1 is an example of a sealing resin for fixing the end 101 of the protective member 10 described later. Regarding the shape of the shielding film 6, refer to Figure 3 This will be described in detail later.

[0075] Figure 2 Yes Figure 1 The sensor 1 shown is a perspective view of an exploded representation. Figure 2 As shown, in the second frame 3 constituting the frame (2, 3), in addition to a part of the main circuit (5, 53, 54, 6, ...), a part of the flexible substrate 8, and the socket 9, a cylindrical insulating member 7 formed of a resin material is also accommodated. The socket 9 is connected to one end (rear end) 82 of the flexible substrate 8 by welding or the like, and a mounting portion 84 is provided at the other end (front end) 81. The mounting portion 84 of the flexible substrate 8 is a land pattern or a connector, etc., similar to the mounting portion 54 of the main substrate 5, and is connected to the mounting portion 54.

[0076] In addition to the socket 9, light-emitting elements 83G and 83O may be installed at the end 102 of the flexible substrate 8. The light-emitting element 83G is, for example, a communication indicator light, which is a green light-emitting diode. The light-emitting element 83O is, for example, an operation indicator light, which is an orange light-emitting diode. The insulating member 7 is embedded in the first frame 2 and the second frame 3. The thickness of the insulating member 7 can ensure an insulation withstand voltage distance, which is used to protect the main circuit (5, 53, 54, 6, ...), the flexible substrate 8 and their welding parts from static electricity from the outside of the frame (2, 3).

[0077] The socket 9 has at least one contact terminal 91 and an insulator 90 supporting the contact terminal 91. In the example shown in the figure, the contact terminal 91 is a connecting pin formed in a rod shape. The shape of the contact terminal 91 is not limited to a rod shape, and may be other shapes.

[0078] The insulator 90 is formed of a resin material and is an insulator that supports a plurality of contact terminals 91 in a manner that they do not contact each other. In the example shown in the figure, the insulator 90 is formed in a cup shape with a flange portion. The contact terminals 91 are arranged deep inside the frame (2, 3) according to the length of the insulator 90. An airtight member 39 such as an O-ring is installed in the gap between the insulator 90 and the second frame 3.

[0079] Figure 3 The main substrate 5 is viewed from the back side 5B. Figure 1 The shielding film 6 and the cross-sectional view of the protective member 10 are shown. Figure 3 As shown, the shielding film 6 is trimmed in a manner that does not interfere with the insulating member 7, and has a winding portion 63 and a tongue portion 64 protruding from the winding portion 63. The winding portion 63 is wound around the main substrate 5 along the short side direction Y intersecting the long side direction X of the main substrate 5, and not only covers the surface 5A of the main substrate 5 (see Figure 1 ) and a portion of the back side 5B, and also covers a portion of the end face 5C of the main substrate connecting the surface 5A and the back side 5B.

[0080] On the other hand, the tongue portion 64 covers only a portion of the front surface 5A and / or a portion of the back surface 5B of the main substrate 5 . Figures 1 to 3 In the example shown, a pair of tongue pieces 64 are formed along a portion of the front surface 5A and the back surface 5B. At least a portion of the tongue piece 64 overlaps with the insulating member 7 in the thickness direction Z of the main substrate 5 .

[0081] The tongue portion 64 constitutes the end portion of the shielding film 6 facing the flexible substrate 8. One end portion 102 of the protective member 10 abuts against the tongue portion 64. When the tongue portion 64 is formed on the front and back sides, the protective member 10 can be arranged on any one of the tongue portions 64 (the tongue portion 64 on the back side 5B in the example shown in the figure). The flexible substrate 8 is accommodated in the accommodation space on the side where the protective member 10 is arranged.

[0082] Figure 4 Yes Figure 1 The flexible substrate 8 is a cross-sectional view of the state before being folded. Figure 4As shown, in a state after being sealed with the primary sealing resin S1 and before being sealed with the secondary sealing resin S2, the flexible substrate 8 connects the main substrate 5 accommodated in the first frame 2 and the socket 9 accommodated in the second frame 3. The first frame 2 and the second frame 3 can move freely within the length of the flexible flexible substrate 8. The socket 9 is welded to the flexible substrate 8.

[0083] In from Figure 4 When the semi-finished product sensor 1 is assembled, the detection part 4 is set to face vertically downward in the state where the first frame body 2 and the second frame body 3 are separated, and the resin composition of the secondary sealing resin S2 is injected into the first frame body 2. The flexible substrate 8 is folded along the insulating member 7, and the second frame body 3 is attached to the first frame body 2. The frames (2, 3) are turned upside down so that the socket 9 faces vertically downward, and the resin composition of the secondary sealing resin S2 is cured by heating or the like.

[0084] In this assembly method, Figure 4 During the folding process of the flexible substrate 8 indicated by the two-dot chain line, the receiving space of the flexible substrate overlaps with the receiving space of the main substrate. If there is no protection member 10, the flexible substrate may interfere with the shielding film.

[0085] According to the sensor 1 of the present embodiment constructed as described above, even if the frame (2, 3) is divided and constructed, the end 62 of the shielding film 6 is not easily rolled up by the protective member 10 abutting against the end 62 of the shielding film 6 from the side opposite to the main substrate 5. Even if the tongue portion 64 that is easy to roll up is formed at the end 62, deformation of the shielding film 6 can be prevented.

[0086] Furthermore, the protective member 10 is fixed in a manner buried in the primary sealing resin S1, so that the position of the protective member 10 is not easily displaced even if a force is applied from the flexible substrate 8. The protective member 10 is formed of a material such as a laminate of FR-4 grade having higher rigidity than the flexible substrate 8, and is not easily deformed even when it abuts against the flexible substrate 8.

[0087] The above-described embodiments are intended to facilitate understanding of the present invention and are not intended to limit the present invention. The various elements and their configurations, materials, conditions, shapes, and sizes included in the embodiments are not limited to the illustrative ones, but can be appropriately changed. Moreover, the structures shown in different embodiments can be partially replaced or combined with each other. Part or all of this embodiment can also be recorded as the following notes, but is not limited to the following.

[0088] [Notes]

[0089] A sensor, comprising:

[0090] A socket 9, which can be connected to an external plug P;

[0091] A second frame 3 accommodates at least a portion of the socket;

[0092] The main substrate 5 is provided with electronic components 53 for sensing;

[0093] a shielding film 6 covering at least a portion of the main substrate to shield at least one of electromagnetic waves emitted from the main substrate and electromagnetic waves intended to invade the main substrate from the outside;

[0094] A first frame 2, accommodating at least a portion of the main substrate and at least a portion of the shielding film;

[0095] A connecting member 8, connecting the main substrate and the socket; and

[0096] The protection member 10 is in contact with the end portion of the shielding film facing the connection member from the side opposite to the main substrate.

Claims

1. A sensor, comprising: Socket, which can be connected to an external plug; A second frame body accommodating at least a portion of the socket; A main substrate on which electronic components for sensing are mounted; a shielding film covering at least a portion of the main substrate to shield at least one of electromagnetic waves emitted from the main substrate and electromagnetic waves intended to invade the main substrate from the outside; a first frame body, accommodating at least a portion of the main substrate and at least a portion of the shielding film; A flexible connecting member connecting the main substrate and the socket; a protective member abutting against an end portion of the shielding film facing the connecting member from a side opposite to the main substrate; and Sealing resin, for sealing the electronic components used for sensing, The protection member has a cantilever beam structure in which one end portion abuts against an end portion of the shielding film and the other end portion is buried and fixed in the sealing resin.

2. The sensor according to claim 1, further comprising: A cylindrical insulating member is embedded in the second frame body. The shielding film comprises: a winding portion, which is wound around the main substrate along a short side direction intersecting the long side direction of the main substrate, and covers not only a part of the surface and a part of the back side of the main substrate, but also a part of the end surface of the main substrate; and a tongue portion, which protrudes from the winding portion and covers only a part of the surface and / or a part of the back side of the main substrate, At least a portion of the tongue portion constitutes an end portion of the shielding film facing the connection member, and overlaps with the insulating member in the thickness direction of the main substrate.

3. The sensor according to claim 1 or 2, wherein The protection member is formed of a material having higher rigidity than that of the connection member.

4. The sensor according to claim 3, wherein The protection member is formed of a laminate of FR-4 grade in compliance with the American National Standards Institute specification.

5. A sensor comprising: A main substrate on which electronic components for sensing are mounted; a shielding film covering at least a portion of the main substrate to shield at least one of electromagnetic waves emitted from the main substrate and electromagnetic waves intended to invade the main substrate from the outside; a protective member abutting against an end portion of the shielding film from a side opposite to the main substrate; and Sealing resin, for sealing the electronic components used for sensing, The protection member has a cantilever beam structure in which one end portion abuts against an end portion of the shielding film and the other end portion is buried and fixed in the sealing resin.

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