JPH11220284A - Shield structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shield cover which is formed of a single metal plate by blanking and bending and excellent in assembly. SOLUTION: A shield cover 8 is formed of a metal plate equipped with four sidewalls 82a, 82b, 84a, 84b which are formed by bending along the four sides of a top plate. A pair of cut/raised pawls 86 which serve as first engaging parts are provided to the opposed first and third sidewall, 84a and 84b, respectively, and the opposed second and fourth sidewall, 82a and 82b, are bent so as to form an obtuse angle with the top plate 81 respectively. An auxiliary side wall 83 is provided to the side edges of each of the sidewalls 82a and 82b by bending them nearly in parallel with the sidewalls 84a and 84b respectively. An engaging hole 85 serving as a second engaging part which is engaged with the first engaging part in a state, where the sidewall 82a or 82b bent inwards resisting an elastic force is provided to each of the auxiliary sidewalls 83.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield structure such as a vibratory gyroscope.

[0002]

2. Description of the Related Art Such a conventional shield structure is disclosed, for example, in Japanese Utility Model Publication No. 5-37510, which is shown in FIG. FIG. 19 is an explanatory view showing a conventional shield structure. In FIG. 19, 200 is a frame main body, 201a, 201b, 201c are side walls,
202 is a second engaging portion, 203 is a cover, 204 is a first engaging portion, 205 is an elastic piece, and 206 is a lower cover.

[0003] As shown in FIG.
Is formed into a U-shape in a plan view, and the opening of the frame body 200 is covered with upper and lower covers 203 and 206 to form a shield structure.

[0004]

However, in the prior art, the frame body 200 and the upper and lower covers 20 are not provided.
No. 3,206, the shield cover is composed of three parts, and the workability of assembling the shield cover is poor.

A first object of the present invention is to provide a shield structure in which a shield cover can be formed by punching and bending a single metal plate and which has good assembling workability. A second object of the present invention is to provide a shield structure in which a first engagement portion is formed at a more distal end side than a central portion of the first and third side walls and more securely engages with the second engagement portion. It is to provide.
A third object of the present invention is to provide a liquid ejecting apparatus which is capable of performing a first
Alternatively, the third side wall and the auxiliary side wall are overlapped on the top plate side, and can be engaged only by pushing in the second and fourth side walls, thereby providing a shield structure capable of further improving the assembling workability. It is to be. A fourth problem of the present invention is that the corner portion becomes discontinuous when the auxiliary side wall is on the inside, but when the auxiliary side wall is on the outside, the corner portions of the first to fourth side walls are continuous, and the finger is formed at the corner. An object of the present invention is to provide a shield structure that is unlikely to be caught and injured, and that is safe. A fifth object of the present invention is to provide a shield structure in which the first and third side walls are in pressure contact with the auxiliary side walls and can be securely engaged with each other. A sixth object of the present invention is to provide a shield structure in which a member housed therein functions as a stopper so that the engagement of the engagement portion does not come off, and the engagement does not come off unexpectedly. That is. A seventh object of the present invention is to provide a shield structure in which a substrate (mold case) does not fall off a shield cover without providing a means for holding a substrate on which an electronic circuit is mounted in a shield case. is there. An eighth object of the present invention is that a fixing claw (convex portion) provided at a tip of the second and fourth side walls is inserted into a hole of a printed circuit board, and after the insertion, the first engaging portion is engaged with the first engaging portion. An object of the present invention is to provide a shield structure capable of preventing the second and fourth side walls from opening due to disengagement with the second engagement portion.

[0006]

A first object of the present invention is to provide a shield structure for shielding an electronic circuit housed inside a shield cover, wherein the shield cover has a substantially rectangular top plate, A single metal plate having four side walls bent from each side of the top plate, and a pair of first engagements is respectively formed on the opposing first and third side walls of the side walls. And the other opposing second and fourth side walls are bent and formed so that the angle formed by the top plate becomes an obtuse angle, and from both side edges of the second and fourth side walls, respectively. An auxiliary side wall is formed by bending the auxiliary side wall substantially in parallel with the first and third side walls, and the second and fourth side walls are formed on the auxiliary side wall by being pressed inward against elastic force. The first means provided with the second engaging portions for engaging with the first engaging portions, respectively. It is solved. The second problem is that, in the first means, the first engagement portion is formed on a tip end side of a center portion between the first and third side walls, respectively.
It is solved by the means of. The third problem is that, in the first or second means, even when the first engagement portion and the second engagement portion are not engaged, the top plate side of the auxiliary side wall is the same as that of the first or second means. A third overlapping the first and third sidewalls
It is solved by the means of. The fourth object is achieved by the third means, wherein the auxiliary side wall is located outside the first and third side walls. The fifth object is achieved by a fifth means in which the first and third side walls are in pressure contact with the auxiliary side wall, respectively, in the third or fourth means. The sixth subject is a fourth subject.
Alternatively, in the fifth means, the problem is solved by a sixth means in which the first and third side walls are regulated so as not to bend inward by a member accommodated therein. The seventh problem is that, in the sixth means, the member housed inside is an insulating mold case provided with the electronic circuit,
According to a seventh aspect of the present invention, a retaining claw of the mold case is provided at an end of one of the side walls. The eighth object is that, in the seventh means, the retaining claw is provided on the first and / or third side wall, and is inserted into a hole formed in a printed circuit board to which the shield cover is attached. This is solved by an eighth means in which the fixing claws are provided at the tips of the second and fourth side walls. The first problem is a shield structure for shielding an electronic circuit housed inside a shield cover,
The shield cover is made of a single metal plate having a substantially rectangular top plate and two opposing side walls bent from two sides of the top plate, and the two side walls are formed of the top plate. Are formed so as to form an obtuse angle, and auxiliary side walls are formed so as to overlap each other from both side edges of the two side walls. And a ninth means provided with a second engaging portion that engages with the first engaging portion.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 is a side view showing an embodiment of the present invention, and FIGS. 2A, 2B, 2C, 2D and 2E are a plan view, a front view, a bottom view, a right side view, and a rear view of a vibratory gyroscope. 3A and 3B are longitudinal sectional views showing a vibration type gyroscope through a shield cover, and rear views of the vibratory gyroscope with the lid removed, and FIGS. 4A, 4B and 4C show the vibrator attached to a substrate with a support member. 5 is an exploded perspective view of the vibratory gyroscope, and FIGS. 6A, 6B, and 6C.
D and E are a plan view, a front view, a bottom view, a left side view, and a rear view of the lid, FIG. 7 is a sectional view taken along the line 7-7 in FIG. 6B, and FIG. 8 is a line 8-8 in FIG. 6E. 9A, B,
C, D, and E are a front view, a bottom view, a right side view, a rear view, and a plan view of the case, FIG. 10 is a cross-sectional view taken along line 10-10 of FIG. 9D, and FIGS. 11A, B, C, D, and E is a plan view, front view, bottom view, right side view, and rear view of the shield cover, FIG. 12 is a perspective view showing a state before the shield cover is engaged, and FIG. 13 is a state after the shield cover is engaged. 14A and 14B are explanatory views (partial cross-sectional views) showing engagement portions of the shield cover in FIGS. 12 and 13, respectively. FIG. 15 is a perspective view showing a modification of the shield cover, and FIG. 16 is a shield cover. FIG. 17A is an explanatory diagram of the vibrator viewed from the front surface, FIG. 17B is an explanatory diagram of the vibrator viewed from the back surface at the time of driving detection of the vibrator, and FIG. FIG. 4 is an explanatory view showing a direction of dielectric polarization of a vibrator.

In FIG. 1, reference numeral 100 denotes a vibrating gyroscope incorporating a tripod tuning fork vibrator 1 to be described later. The vibrating gyroscope 100 is fixedly mounted on, for example, a printed circuit board 101 of a car navigation system.

The vibrator 1 is of a three-leg tuning fork type (or two-leg tuning fork type), and a gyroscope for detecting an angular velocity by generating a vibration component due to a Coriolis force in a rotating system, a piezoelectric transformer, a vibration device, and the like. Used for

As shown in FIG. 5, a vibrating gyroscope 100 has a case 2 having an open top, and a support member which is attached with a base 1A of the vibrator 1 sandwiched between vibration isolating rubbers 3. 4, a flexible wiring board 5 that is thermally welded and fixed to the base end portion 1A of the vibrator 1, a board 6 to which the support member 4 is attached and the vibrator 1 is fixed, and a case in which the board 6 is stored. 2 and a shield cover 8 that covers the integrated case 2 and the cover 7 to shield the outer surface.

The vibrator 1 has a plate-like shape in which a piezoelectric material serving as a driving unit and a detecting unit is laminated on a surface of a constant elastic material such as an elinvar, or is formed entirely of a piezoelectric material serving as a driving unit and a detecting unit. It is a plate-like material, and a drive electrode for driving each vibrating arm and a detection electrode for detecting vibration are formed on the surface of the piezoelectric material.

In this embodiment, the vibrator 1 is a PZT
It is made of a piezoelectric material such as a plate-like piezoelectric ceramic such as (lead zirconate titanate). As shown in FIG. 12a, 12b and 12c are integrally formed. The direction of dielectric polarization of the piezoelectric material in each of the vibrating arms 12a, 12b, and 12c is as shown in FIG.
The dielectric polarization directions of b and 12c are the same, and the dielectric polarization direction of the center vibrating arm 12a is symmetrical to the left and right vibrating arms 12b and 12c in the horizontal and vertical directions. Each vibrating arm 12
In a, 12b, and 12c, a pair of drive electrodes 13, 13,... are respectively formed on the lower surface (back surface) side of a conductive material, and the drive electrodes 13, 13,. , Extending to the end face 1B of the vibrator 1 and the base end 1A.
Are formed with land portions 13a and 13b. The land 13b is connected to the two drive electrodes 13,13.
Are electrically connected to an AC drive power supply 15 through a conductive path, and the AC drive power supply 15 applies a drive voltage of the same potential to each of the drive electrodes 13, 13,. One ground electrode 14 is formed on the back surface of the central vibrating arm 12a. The ground electrode 14 extends to the end face 1B of the vibrator 1 and has a land portion 14a formed at the base end 1A. The ground electrode 14 is at the ground potential due to the wiring path. On the upper surface (front surface) of the vibrator 1, the left and right vibrating arms 1
A pair of ground electrodes 16 are formed on 2b and 12c, and one ground electrode 16 is formed on the center vibrating arm 12a. As shown in FIG. 17A, four ground electrodes 16, 16... Formed on the vibrating arms 12b, 12c are connected to the vibrator 1
Land portions 16b are formed on the base end portion 1A so as to extend to the end surface 1B of the base end portion 1A.
A single ground electrode 16 provided at a extends to a position short of the end surface 1B of the vibrator 1 and has a land portion 16a formed at a base end 1A. Depending on the wiring route, each ground electrode 16,
16 are ground potentials.

A driving voltage is applied to the piezoelectric material as driving means by the driving electrodes 13, 13,..., The ground electrode 14, and the ground electrodes 16, 16,. According to the dielectric polarization structure shown in FIG. 18, the left and right vibrating arms 12b and 12c are driven to vibrate in the same direction in the X direction, and the center vibrating arm 12a has the opposite phase (1) to the left and right vibrating arms 12b and 12c.
Vibration drive is also performed in the X direction by a phase different by 80 degrees). That is, at some point, the left and right vibrating arms 12
The amplitude of b, 12c in the X direction is opposite to the amplitude of the vibrating arm 12a in the X direction.

A pair of detection electrodes 17a and 17b are formed on the upper surface of the center vibrating arm 12a. Each detection electrode 1
7a and 17b extend to the position of the end face 1B behind the vibrator 1 and have respective detection electrodes 17a and 17b.
Are integrally formed with land portions 17a1 and 17b1. These land portions 17a1 and 17b1 are formed wide at the base end 1A because the land 16a of the ground electrode 16 does not reach the end surface 1B of the base end 1A of the vibrator 1.

Each drive electrode 1 formed on the vibrator 1
Are electrically connected to the conductive pattern (circuit pattern) of the circuit board 6 via the flexible wiring board 5 not shown in FIG. 17, and are shown in FIG. 17 through this conductive pattern. To the AC power source 15. Also, the ground electrodes 14, 16, 16... And the detection electrodes 17a, 17b are also electrically connected to predetermined conductive patterns on the circuit board 6 via the flexible wiring board 5. The flexible wiring board 5 has a vibrator front-side connection end 5a and a vibrator back-side connection end 5b, one end of which is bifurcated to be thermally welded to the front and back lands of the vibrator 1, respectively. Is provided with a substrate connection end 5c connected to a conductive pattern (not shown) of the substrate 6.

Further, since the vibrator 1 is cantilevered by one supporting member 4, the number of fixing parts is minimized. Further, since the base end 1A of the vibrator 1 is supported by the support member 4, the vibrator 1 is stably supported by the support member 4. Further, since the vibrator 1 is mounted on the circuit board 6 via the vibration isolating rubber 3 of the support member 4, external shock and external vibration given to the circuit board 6 can be buffered by the vibration isolating rubber 3, and It is possible to prevent shock and vibration from being directly transmitted.

In particular, in the three-legged tuning fork type vibrator 1 shown in FIG. 1 and subsequent figures, the left and right vibrating arms 12b and 12c and the central vibrating arm 12a vibrate at phases different from each other by 180 degrees. Therefore, even if vibration occurs at the base end 1A of the vibrator 1, the vibration is extremely small. Therefore, the vibrating arms 12a, 12b, and 12c can vibrate without being restrained by the support in a state where the base end portion 1A is supported by the support member 4, and the driving sensitivity and the detection sensitivity of each vibrating arm do not decrease. .

By the way, the mass of the vibrating arm is m and the X of the vibrating arm is
Assuming that the vibration velocity in the axial direction is v (vector value) and the angular velocity about the Z axis in the rotating system is ω0 (vector value), the Coriolis force F (vector value) is: F = 2m (v × ω0) (× is And the Coriolis force F is proportional to the angular velocity ω0. Therefore, the angular velocity ω0 is determined by detecting the deformation vibration of the vibrating arm 12a in the Y-axis direction by the detection electrode.

When the vibrator 1 is placed in a rotating system having an angular velocity about the Z axis, the Coriolis force F shown by the above equation gives
Each of the vibrating arms 12a, 12b, and 12c has a vibration component in the Y direction. Since the phases of the vibrations due to the drive voltage are opposite between the vibrating arms 12b and 12c on both sides and the central vibrating arm 12a, the phases of the vibrations due to the Coriolis force are also different.
12c is opposite to the vibrating arm 12a. That is, at a certain time, the amplitude directions on the Y axis due to the Coriolis force of the vibrating arms 12b and 12c are the same, and the center vibrating arm 12a
The amplitude direction on the Y axis is opposite to that of the vibrating arms 12b and 12c.

The detection electrodes 17a and 17b are formed on the same surface of the central vibrating arm 12a,
Function as a Coriolis force detecting means. Since the dielectric polarization directions of the piezoelectric material in the portions where the detection electrodes 17a and 17b are formed are opposite to each other, the detection electrode 17a and the detection electrode 17b have a phase difference of 180 degrees with respect to the vibration component in the Y direction due to the Coriolis force. A detection output is obtained by the piezoelectric action. By taking the difference between the detection outputs from the two detection electrodes 17a and 17b, the absolute values of the detection outputs from the detection electrodes 17a and 17b are added. From this detection output, it becomes possible to calculate the angular velocity ω component around the Z axis.

As shown in FIGS. 2, 4 and 5, the base 1 A of the vibrator 1 is supported by a support member 4 while being sandwiched by a vibration-proof rubber 3. As shown in FIG. 5, the support member 4 includes a support member case 41 and a support member lid 42 that is attached and fixed to the support member case 41 in which the vibration-proof rubber 3 is stored. The support member case 41 is formed by bending a metal plate, and as shown in FIG. 5, a square plate-shaped bottom plate portion 41a, and side plate portions 41b, 41b, 41b formed by bending the three sides thereof. Side plate 41
b, the fixing piece 4 of the support member lid 42 projecting from the upper end of
1c, the positioning piece 41d of the vibration-proof rubber 3 cut inward from the opposing side plates 41b, 41b, and the foot 41e for attachment to the substrate 6 projecting from the upper end of the side plate 41b. Has become. The support member lid 42 has a slit 42a into which a fixing piece 41c, a foot 41e, or the like is inserted.
Are formed.

The anti-vibration rubber 3 includes first and second anti-vibration rubbers 3.
As shown in FIG. 5, the first vibration-proof rubber 31 has a concave portion 31a into which the base end portion 1A of the vibrator 1 is fitted.
And a notch 31b for pulling out the flexible wiring board 5 welded and fixed to the base end 1A of the vibrator 1, and a pair of walls 31c, 31c constituting the notch 31b are provided. The second anti-vibration rubber 32 has a rectangular plate shape, and has cutout portions 32a, 32a on both sides where the wall portion 31c of the first anti-vibration rubber 31 is fitted.

Then, the first vibration isolating rubber 31 is fitted into the supporting member case 41. The vibrator 1 in which the flexible wiring board 5 is thermally welded and fixed to the base end 1A of the vibrator 1
The base end portion 1A is connected to the concave portion 31 of the first rubber 31 for vibration isolation.
a, and further attaches the second rubber 32 for vibration isolation to the vibrator 1.
Are fitted into the notches 32a, 32a of the second vibration-proof rubber 32 on the walls 31c, 31c of the first vibration-proof rubber 31 so as to sandwich the base end 1A.
And a fixing piece 41c protruding from the slit 42a.
Is bent, whereby the support member 4 is attached to the vibrator 1.

By inserting the legs 41e of the support member 4 into the slits (slits 6b) of the substrate 6 and soldering them on the back surface, the vibrator 1 is interposed via the rubber rubber 3 as shown in FIG. It is attached to the substrate 6 by the support member 4. In the case of this embodiment, the vibrator 1 is used with the base end portion 1A down and the vibrating arms 12a, 12b, 12c up.

The case 2 is formed of a synthetic resin in the shape of a square box having an upper opening, and as shown in FIGS. 9 and 10, a square bottom 20 and side walls 21 formed on four sides of the bottom 20. , 21... Provided on the inner surface of the side wall 21 to determine the height of the substrate 6, and to be positioned in the notch 6 a of the substrate 6 by positioning and projecting portions by heat caulking. 6 is provided on the outer surface of the opposing side walls 21, 21, and the shield cover 8
Tapered portions 24, 24 that serve as guides for insertion of the taper, a convex step portion 25 that is formed continuously with the tapered portion 24, and that serves as a receiving portion when the retaining claw 87 of the shield cover 8 is bent. A notch 26 for taking out the terminal 9 of the case 6 to the outside of the case 2, and a guide pin 27 for positioning the substrate 6.
And a tapered portion 28 provided on the outer surface of the bottom portion 20 and serving as a guide when the shield cover 8 is inserted. The bottom surface 26a of the notch 26 is a flat surface. As shown in FIG. 16, both corners 29, 29 of one side wall 21 of case 2 are formed in a round shape so as to be easily fitted into shield cover 8. The case 2 and the lid 7 are made of PBT (polybutylene terephthalate), PP
A synthetic resin material called engineering plastic such as S (polyphenylene sulfide) and ABS (acryl butadiene styrene) can be used, and PBT is preferable from the viewpoint of heat resistance and strength. The case 2 may also have an opening at the bottom, and the bottom opening may be closed by attaching a bottom cover.

A detection circuit and the like are mounted on the substrate 6.
As shown in FIGS. 4 and 5, a notch 6 a into which the fixing rib 23 is fitted, an insertion hole 6 b into which the mounting foot 41 e of the support member case 41 is inserted, and a guide hole into which the guide pin 27 is inserted. 6c and a terminal 9 connected and fixed to a pattern connected to a detection circuit and the like. 61 is a semi-fixed variable resistor mounted on the substrate 6. The terminal 9 will be described later.

The lid 7 is formed in a rectangular plate shape as a whole so as to be positioned inside the side wall 21 of the case 2 and to close the opening. As shown in FIGS. A concave portion (inner bottom portion) 71 whose concave side is formed on the (case) side.
And a side portion 72 formed so as to surround the concave portion 71, and an inclined surface portion 73 formed along a peripheral edge on the upper surface side of the flat plate portion 70.
And a shield cover 8 protruding from the upper surface of the flat plate portion 70.
Tapered portions 74, 74 serving as guides for inserting the
The case 2 is provided with a through hole 75 for venting air and the like in the case 2 when heating is performed at the time of bonding between the case 2 and the case 2, and a cutout portion 76 for leading out the terminal 9 formed in the side portion 72.

The cover 7 has an inverted dish shape as a whole. When the cover 7 is covered so as to cover the opening of the case 2, as shown in FIGS. Along the peripheral edge (joint between the lid 7 and the case 2) of the lid 7
A concave groove G is formed by 3 and the upper end of the side wall 21 of the case 2. By filling the concave portion G with the adhesive S (the portion shaded in a grid in FIG. 16), the adhesive S can be applied only to the joint between the lid 7 and the case 2. . In addition, the tips of the four corners of the side portion 72 are in contact with the substrate 6 so that the lid 7 does not fall into the case 2.

The shield cover 8 is formed by punching and bending a single metal plate having a thickness of 0.3 mm, and a metal material (copper, steel, aluminum, or the like) can be used as a material.
In the present embodiment, a tinned steel sheet that is preferable in terms of cost, strength, and solderability is used. The shield cover 8
As shown in FIGS. 2, 5, and 11 to 14, a rectangular top plate 81 and a pair of second and fourth side walls 82 a, which are bent at obtuse angles from both long sides of the top plate 81, respectively.
82b, a pair of auxiliary side walls 83 bent at substantially right angles from both side edges of the second and fourth side walls 82a and 82b, and a pair of second side walls bent at obtuse angles from both short sides of the top plate 81, respectively. 1, third side walls 84a, 84b
And a locking hole 85 formed near the free end of the auxiliary side wall 83.
And a cut-and-raised claw 86 formed near the front end of the first and third side walls 84a and 84b and snapped into the locking hole 85, and formed at the front end of the first and third side walls 84a and 84b. A retaining claw 87 of the case 2 and a printed circuit board 101 formed at the tips of the second and fourth side walls 82a and 82b.
And a fixing claw 88 for fixing to Therefore, the second and fourth portions extending beyond 90 degrees with respect to the top plate 81
When the side walls 82a and 82b are pushed in, the cut-and-raised claw 86 is snapped into the locking hole 85 to form a rectangular box-shaped shield cover 8 as shown in FIG.

As shown in FIGS. 4 and 5, the terminal 9 of the present embodiment is in the shape of a long plate, and is inserted into the orthogonal direction from the substrate 6 and fixed. A bent first horizontal plate portion 91, a first vertical plate portion 92 bent upward at a substantially right angle from the first horizontal plate portion 91, and a substantially right angle from the first vertical plate portion 92 The second horizontal plate portion 93 is formed by bending and has a two-stage shape as a whole. When the substrate 6 is mounted in the case 2, as shown in FIG.
1 is just the bottom surface 26a of the notch 26 of the case 2.
(See FIG. 10) so that there is no gap, and the inner surface side of the first vertical plate portion 92 is set along the inner surface of the concave groove portion G. The width of the terminal 9 is determined by the notch 26 of the case 2 and the notch 76 of the lid 7.
Is set to be substantially the same as the width.

Therefore, the first horizontal plate portion 91 of the terminal 9
The notch 26 of the case 2 and the notch 7 of the lid 7
6, the adhesive S filled in the groove G can be prevented from leaking into the case 2. Further, the first vertical plate portion 92 can prevent the adhesive S filled in the groove G from leaking to the side surface of the case 2.

The notch 26 of the case 2 and the lid 7
The notch 76 is bent in two steps to form the first horizontal plate 91 and the like of the terminal 9 so as to have substantially the same shape as the inner surface of the groove G, so that the adhesive G is filled in the groove G. Then, the adhesive S is evenly and uniformly filled in the groove G, and the case 2 and the lid 7 can be stably fixed.

Here, a method of assembling the case 2 and the lid 7 will be described. The substrate 6 is guided into the case 2 by the guide pins 27, and the fixing ribs 23 of the case 2 are fixed by heat caulking. Next, the lid 7 is placed over the opening of the case 2, and an epoxy resin-based thermosetting adhesive S is dispensed with a dispenser or the like into the groove G formed along the joint between the case 2 and the lid 7. The terminal (9, 26) of the terminal 9 is covered with the thermosetting adhesive S applied. Thereafter, the adhesive S is dried and cured by heating. Even if the air in the case 2 expands due to the heating, the air can escape from the through hole 75, so that the case 2 and the lid 7 are not damaged.
Thereafter, as shown in FIG. 16, the through hole 75 of the case 2 is covered with the seal 102.

As the adhesive, an insulating adhesive such as an epoxy-based or silicon-based adhesive can be used, and an epoxy resin-based thermosetting adhesive is preferable in terms of heat resistance and adhesive strength. An ultraviolet curable adhesive may be used. The viscosity of the adhesive is normal temperature (20 °
If a slightly higher value of about 500 poise is used in C),
It may be hard to leak.

Here, a method of assembling the shield cover 8 will be described. As described above, the shield cover 8 is formed by bending a single metal plate, as shown in FIGS.
As shown in FIG. 4A, the auxiliary side wall 83 is disposed outside the first and third side walls 84a and 84b, and the first and third side walls 8 are formed.
Since 4a and 84b are bent at an obtuse angle with respect to top plate 81, first and third side walls 84a and 84b are pressed against corresponding inner surfaces of auxiliary side walls 83 by their elastic force. In addition, the locking holes 85 and the cut-and-raised claws 86 are removed from the second and fourth side walls 82a and 82b in an open state. Even in the state of FIG. 12, even near the base of the auxiliary side wall 83 and the first and third side walls 84a and 84b (the top plate 81
Side) are overlapped (abut and overlap), and when the second and fourth side walls 82a and 82b are pressed and bent, the first and third side walls 84a and 84b You can snap in smoothly without getting caught. From the state shown in FIG. 12, the second and fourth side walls 82a and 82b of the shield cover 8 are pressed from above and below to resist the elastic force generated by bending the second and fourth side walls 82a and 82b. Press and bend. Then, Figure 1
3 and FIG. 14B, the first and third side walls 84
The cut-and-raised claws 86 a and 84 b reach and engage the locking holes 85 of the auxiliary side wall 83. Then, even when the pressing force is removed, since the press contact force acts between the outside of the first and third side walls 84a and 84b and the inside of the auxiliary side wall 83, the cut-and-raised claw 86 and the locking hole 85 are formed. Is maintained.

As shown in FIG. 16, the integrated lid 7 and case 2 are fitted into the shield cover 8 assembled as described above. When this is inserted, the case 2
The case 2 (and the lid 7) is fitted into the opening of the shield cover 8 by the rounded corners 29, 29 of
When the cover is further pushed in, it is guided by the tapered portions 24, 28, 74 projecting from the case 2 and the lid 7, so that the opening edge of the shield cover 8 can be fitted without being caught by the projecting portions of the case 2 and the lid 7. When fitted in this way, the inner surface of each side wall of the shield cover 8 abuts only on the tops of the tapered portions 24, 28, 74 and the protruding step 25, and the tops of the first and second shield covers 8 are used. The third side walls 84a and 84b and the second and fourth
The side walls 82a, 82b and the auxiliary side wall 83 are pressed outward. The case 2 and the lid 7 are hardly detached by being fitted into the shield cover 8 in this manner. Thereafter, as shown in FIG. Then, the case 2 and the lid 7 are stopped so that the case 2 and the lid 7 do not come off from the inside of the shield cover 8, and the vibratory gyroscope 100 shown in FIGS. 2A to 2E is obtained. Here, when the retaining claw 87 is bent, a force acts on the first and third side walls 84a and 84b, so that the engagement between the locking hole 85 and the cut-and-raised claw 86 may be released. However, the first and third side walls 84a and 84b are prevented from being deformed inward by receiving the force by the convex step portion 25, thereby preventing the engagement from being released.

The engaging holes and the cut-and-raised claws, which are the engaging portions, may be arranged in the opposite manner to the above embodiment, but are engaged with the second and fourth side walls 82a and 82b (auxiliary side walls 83). Hole 8
It is preferable that the first and third portions 84a and 84b have the cut-and-raised claws (or convex portions) 86 because the space for the locking holes can be increased and the strength of the shield cover can be maintained. .

Further, in the above embodiment, the auxiliary side wall 83 is formed by bending both sides of the second and fourth side walls 82a and 82b substantially at right angles. However, the second and fourth side walls 82a and 82b are formed. The first and third inner walls of the auxiliary side wall 83 are bent at substantially right angles or obtuse angles from both short sides of the top plate 81 by bending and forming the auxiliary side wall 83 so that the angle formed between the auxiliary side wall 83 and the upper side 82b is an acute angle. Side walls 84a, 84b
May be pressed against the corresponding outer surfaces.

In the shield cover 8 of the vibratory gyroscope 100, fixing claws (or convex portions) 88 are inserted into holes of the printed circuit board 101, and the fixing claws 88 are swaged or soldered as shown in FIG. Printed circuit board 1
01, and the fixing nail 88 is attached to the printed circuit board 1.
01 is electrically connected to a ground pattern (not shown). Although not shown, a ground pattern (preferably a solid pattern, but a mesh pattern is also possible) is formed on the printed circuit board 101 where the opening of the shield cover 8 is located, and the inside of the case 2 together with the shield cover 8 of the present invention is formed. It has the function of shielding electronic circuits (circuit boards).

Next, a modified example of the shield cover 8 is shown in FIG.
This will be described with reference to FIG. The same parts as those in the above-described embodiment are denoted by the same reference numerals, and detailed description is omitted. This shield cover 8 is different from the shield cover 8 in that the first and third side walls 84a and 84b are not provided. That is, as shown in FIG. 15, a rectangular top plate 81 and a pair of second and fourth side walls 82 a and 82 bent at obtuse angles from both long sides of the top plate 81.
b, a pair of auxiliary side walls 83, 83 which are formed by bending both side edges of the second and fourth side walls 82a, 82b, respectively, and abut on each other and overlap each other;
Locking holes 85 formed near one of the free ends 3 and 83
And the tip of the other auxiliary side wall 83 (shield cover 8
Are formed closer to the opening edge than the center of the
5, a claw 86 snapped into the outer wall 5, a claw 87 for retaining the case 2 formed at the opening edge side of the shield cover 8 of the auxiliary side wall 83 located outside, and the second and fourth side walls 82a, 82b. A claw 88 for fixing to the printed circuit board 101 formed at the tip of 82b is provided. Even in such a shield cover 8 shown in FIG.
By pushing the second and fourth side walls 82a, 82b extending beyond 90 degrees with respect to 1 against the elastic force thereof, the side walls 82a, 82b are cut and raised in the locking holes 85, and the claws 86 are snapped into the rectangular boxes. The shield cover 8 is shaped like a letter.

The shield cover 8 according to this modified example
However, the auxiliary side wall 83 located on the inner side and the auxiliary side wall 83 located on the outer side are bent and formed so as to be pressed against each other. The locking hole 85 and the cut-and-raised claw 86 can be engaged with each other. Also, the retaining claw 8
When the 7 is bent, deformation (inward bending) of the auxiliary side wall 83 located inside is restricted by a member (the convex step 25 of the case 2) housed inside so that the engagement is not released.

In the above-described embodiment, the shield cover 8 for shielding the electronic circuit housed therein is provided with a substantially rectangular top plate 81 and the top plate 81.
Four side walls 82a, 82 bent from each side of
b, 84a, and 84b.
Opposing first and third side walls 84a, 84 of each side wall
b is provided with a pair of cut-and-raised claws 86, each of which is a first engagement portion, and the other opposed second and fourth side walls 82a,
82b is bent and formed so that the angle formed by the top plate 81 is an obtuse angle, and the second and fourth side walls 82a and 82 are formed.
The first and third side walls 84a, 84 from both side edges of 2b, respectively.
The auxiliary side wall 83 is formed to be bent substantially in parallel with 4b.
The auxiliary side wall 83 is a second engaging portion which engages with the first engaging portion in a state where the second and fourth side walls 82a and 82b are bent inward against the elastic force. Since each of the holes 85 is provided, the shield cover 8 can be formed by punching and bending a single metal plate, and the assembling workability is good.

In the above-described embodiment, the cut-and-raised claw 86 is formed on the distal end side from the center of the first and third side walls 84a and 84b. The claw 86 is more reliably engaged. That is, since the root sides of the first and third side walls 84a and 84b are connected to the top plate 81, they do not move freely. Conversely, the tip sides of the first and third side walls 84a and 84b move around the root and are easily bent. Therefore, by providing the engagement portions (snaps) at the distal end portions of the first and third side walls 84a and 84b, the flexibility is good and the snap-in is easy, and the engagement portions are snap-in and fixed. The entire shield cover 8 can also have its shape fixed.

In the above embodiment, the locking holes 85
Even when the cut-and-raised claw 86 is not engaged, the top wall 81 side of the auxiliary side wall 83 remains on the first and third side walls 84a and 84a.
b, the first and third side walls 84a, 84b and the auxiliary side wall 83 always overlap on the top plate 81 side even when they are not engaged. The engagement can be performed smoothly only by pushing the side walls 82a and 82b, and the assembling workability can be further improved.

In the above embodiment, the auxiliary side wall 83
Are located outside the first and third side walls 84a and 84b, the corner portion becomes discontinuous when the auxiliary side wall 83 is inside, but when the auxiliary side wall 83 is outside, the first to fourth side walls 82
Since the corners of a, 82b, 84a, and 84b are continuous, it is unlikely that a finger or the like will be caught at a corner and injured, and it is safe.

In the above embodiment, since the outer surfaces of the first and third side walls 84a and 84b are pressed against the inner surface of the auxiliary side wall 83 by elastic force, respectively, the engagement can be performed more reliably. .

In the above embodiment, the case 2 regulates the first and third side walls 84a and 84b (the auxiliary side wall 83 in the modification shown in FIG. 15) so as not to bend inward. The side portion of the case 2 (particularly, the convex step portion 2)
5) serves as a stopper, and the first and third side walls 84a, 84
Since the b (auxiliary side wall 83) does not bend inward, the engagement does not come off unexpectedly.

In the above embodiment, the case 2 and the lid 7 are insulating mold cases provided with an electronic circuit, and the retaining claw 87 for retaining the molded case is provided with one of the side walls. 82a, 82b, 84a, 84
Since it is provided at the end of b, the substrate (mold case) does not fall off the shield cover 8 without providing a means for holding the substrate on which the electronic circuit is mounted in the shield cover.

In the above embodiment, the retaining claws 87 are provided on the first and / or third side walls 84a and 84b, and are used to fix the holes into the holes formed in the printed circuit board 101. Claws 88 are provided on the second and fourth side walls 82a,
Since the second and fourth side walls 82a and 82b are fixed to the printed circuit board 101 even if external force such as vibration is applied after the fixing claw 88 is inserted, the first and second side walls 82a and 82b are fixed to the printed circuit board 101 because they are provided at the end of the fixing claw 88. And the second engaging portion is disengaged from the engaging portion,
The second and fourth side walls 82a, 82b can be prevented from opening.

In the above-described embodiment (modification), the shield cover 8 for shielding the electronic circuit housed therein is provided with a substantially rectangular top plate 81 and the top plate 81.
Is formed of one metal plate having two opposing side walls (fourth side walls 82a, 82b) bent from two sides of the top plate 81. The second and fourth side walls 82a, 82b are
Are formed so as to form an obtuse angle, and auxiliary side walls 83 are formed by being bent from both side edges of the second and fourth side walls 82a and 82b so as to overlap each other. The auxiliary side wall 83 is provided with a first engagement portion (cut-and-raised claw 86) and a second engagement portion (locking hole 85) that engages with the first engagement portion. The shield cover 8 can be formed by punching and bending of the metal plate described above, and the assembling workability is good.

In the above-described embodiment, the vibration type gyroscope has been described as an example. However, the present invention is not limited to this. For example, the present invention can be applied to a shield structure of a high frequency device such as a tuner. Needless to say.

[0053]

According to the first and ninth aspects of the present invention, the shield cover can be formed by punching and bending a single metal plate, and assembling workability is good.

According to the second aspect of the present invention, since the first engaging portion is formed on the distal end side of the first and third side walls with respect to the central portion, the second engaging portion is more reliably formed. Engages.

According to the third aspect of the present invention, the first or third side wall and the auxiliary side wall overlap on the top plate side even when they are not engaged. Engagement can be achieved simply by pushing it in, so that assembly workability can be further improved.

According to the fourth aspect of the present invention, the corner portion becomes discontinuous when the auxiliary side wall is on the inside, but when the auxiliary side wall is on the outside, the corner portions of the first to fourth side walls are continuous. It is safe to prevent a finger or the like from being hurt and injured at a corner.

According to the fifth aspect of the present invention, the first and the third
The side wall of each has a press contact force with the auxiliary side wall, so that the engagement can be more reliably performed.

According to the sixth aspect of the present invention, the member housed therein functions as a stopper so that the engagement of the engaging portion does not come off, so that the engagement does not come off unexpectedly. .

According to the seventh aspect of the present invention, the substrate (mold case) does not fall off the shield cover without providing a means for holding the substrate on which the electronic circuit is mounted in the shield cover.

According to the eighth aspect of the present invention, since the fixing claws (convex portions) provided at the tips of the second and fourth side walls are inserted into the holes of the printed circuit board, an external force such as vibration is applied. Even after the insertion, the first engagement portion and the second engagement portion are disengaged from each other, so that the second and fourth side walls can be prevented from opening.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIGS. 2A, 2B, 2C, 2D, and 2E are a plan view, a front view, a bottom view, a right side view, and a rear view of the vibratory gyroscope.

FIGS. 3A and 3B are a longitudinal sectional view showing a cover of the vibrating gyroscope and a rear view of a state in which a lid is removed.

FIGS. 4A, 4B, and 4C are a rear view, a left side view, and a bottom view of a state in which a vibrator is attached to a substrate with a support member.

FIG. 5 is an exploded perspective view of the vibration gyroscope.

FIGS. 6A, 6B, 6C, 6D, and 6E are a plan view and a front view of a lid;
It is a bottom view, a left side view, and a rear view.

FIG. 7 is a sectional view taken along the line 7-7 in FIG. 6B.

FIG. 8 is a cross-sectional view taken along line 8-8 of FIG. 6E.

FIG. 9 is a front view, a bottom view, a right side view, a rear view, and a plan view of A, B, C, D, and E of the case.

FIG. 10 is a cross-sectional view taken along line 10-10 of FIG. 9D.

11A, 11B, 11C and 11D are a plan view, a front view, a bottom view, a right side view, and a rear view of the shield cover.

FIG. 12 is a perspective view showing a state before the shield cover is engaged.

FIG. 13 is a perspective view showing a state after the shield cover is engaged.

FIGS. 14A and 14B are partial cross-sectional views showing engagement portions of the shield cover of FIGS. 12 and 13, respectively.

FIG. 15 is a perspective view showing a modified example of the shield cover.

FIG. 16 is a perspective view before a shield cover is attached.

17A is a diagram illustrating the vibrator viewed from the front surface and FIG. 17B is a diagram illustrating the vibrator viewed from the rear surface when detecting driving of the vibrator.

18 is an explanatory diagram showing the direction of dielectric polarization of the vibrator as viewed from the direction of arrow IV in FIG. 17;

FIG. 19 is an explanatory view showing a conventional shield structure.

[Explanation of symbols]

 2 Case 7 Lid 8 Shield cover 24 Tapered portion 81 Top plate 82a Second side wall 82b Fourth side wall 83 Auxiliary side wall 84a First side wall 84b Third side wall 85 Locking hole 86 Cut-and-raised claw 87 Claw 88 Fixing claw 101 Printed circuit board

Claims (9)

[Claims] 1. A shield structure for shielding an electronic circuit housed inside a shield cover, wherein the shield cover is formed by bending a substantially rectangular top plate from each side of the top plate. And a pair of first engaging portions provided on opposing first and third side walls of each of the side walls, and a pair of other opposing second side walls. And the fourth side wall are formed so as to be bent at an obtuse angle with the top plate, and are substantially parallel to the first and third side walls from both side edges of the second and fourth side walls, respectively. An auxiliary side wall is formed by bending the second side wall and the fourth side wall which are pressed inward against the elastic force to engage with the first engagement portion. 2. A shield structure comprising two engaging portions. 2. The shield structure according to claim 1, wherein said first engagement portion is formed at a front end side of a center portion of each of said first and third side walls. 3. The top plate side of the auxiliary side wall according to claim 1, wherein even when the first engagement portion and the second engagement portion are not engaged with each other, A shield structure overlapping with the third side wall. 4. The device according to claim 3, wherein the auxiliary side wall is a first side wall.
And a shield structure located outside the third side wall. 5. The shield structure according to claim 3, wherein the first and third side walls are in pressure contact with the auxiliary side wall. 6. The shield structure according to claim 4, wherein the first and third side walls are regulated by a member housed therein so as not to bend inward. 7. The device according to claim 6, wherein the member housed inside is an insulating mold case provided with the electronic circuit, and a retaining claw of the mold case is provided at a tip of one of the side walls. A shield structure characterized by the following. 8. The device according to claim 7, wherein the retaining claw is provided on the first and / or third side wall,
A shield structure, wherein a fixing claw inserted into a hole formed in a printed circuit board to which the shield cover is attached is provided at a tip of the second and fourth side walls. 9. A shield structure for shielding an electronic circuit housed inside a shield cover, wherein the shield cover has a substantially rectangular top plate and a relative bend formed from two sides of the top plate. A metal plate having two side walls facing each other, wherein the two side walls are formed so as to be bent at an obtuse angle with the top plate, and are formed from both side edges of the two side walls. Auxiliary side walls are formed by bending each other so as to overlap with each other. A first engaging portion and a second engaging portion engaging with the first engaging portion are respectively formed on the overlapping auxiliary side walls. A shield structure characterized by being provided.