JP2515951Y2 - Substrate support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an electronic device mounted on a vehicle, when an external force is applied to an electromagnetic shield of a printed circuit board on which electronic components are mounted and a front panel of the electronic device. The present invention relates to a substrate supporting device having a shock absorbing function capable of absorbing this external force.

[Prior Art] Electronic devices and the like mounted on a vehicle are required to be a structure capable of absorbing impact in accordance with a vehicle safety operation standard in which passenger safety is a top priority. That is, it is desirable that the structure of the device be designed so that, when a part of the body of the occupant contacts the front panel of the device, the impact at the time of contact causes little damage to the occupant.

For this reason, a shock test is usually performed in designing a device to evaluate the shock absorbing performance.

8 to 11 show the construction of a conventional vehicle-mounted reproducing apparatus in which the shock absorbing function is not taken into consideration.

In FIG. 8, 1 is a resin-molded and flexible front panel, 2 is a housing, and 3 is a switch board mounted in parallel with the front panel 1. A display 4 is provided on the substrate 3, and various switches (not shown) are fixedly provided so that the switches can be operated from the front panel 1 side. Also,
On the rear side of the switch board 3, a display control microcomputer 5 is provided.
And the display drive IC9 is attached.

Further, behind the switch substrate 3, a substrate 7 provided with a power supply unit 6 and a substrate 10 provided with a high frequency block 8 are arranged.

Among the components arranged in this way, the power supply unit 6 and the display drive IC 9 are noise sources that generate noise. On the contrary, the display control microcomputer 5 and the high frequency block 8 are affected by noise. It is an easy part. When the above-mentioned components are arranged close to each other for space reasons, the shield plate 12 for electromagnetic shielding is previously provided between the switch substrate 3 and the substrates 7 and 10 as shown in FIG. Is installed.

The shield plate 12 is made of a metal plate and is attached for the purpose of supporting the electromagnetic shield and the rear of the switch substrate 3. Then, in order to prevent the substrate 3 or the shield plate 12 from coming into contact with each other when they are deformed, a cut-and-raised claw 13 bent in the vertical direction is formed at an intermediate position thereof. The tip portion of the claw 13 that functions as a spacer contacts the substrate 3, and when an external force 15 indicated by an arrow in FIG. 10, that is, a shock is applied from the front side of the substrate 3 through the flexible front panel 1, the substrate 3 is bent and deformed. However, since the tip of the claw 13 contacts the substrate 3 to support the substrate 3, a short circuit in which the shield plate 12 and the live parts of the substrate 3 contact each other is avoided.

Instead of the claws 13 having the spacer function, a semicircular extruded diaphragm 14 shown in FIG. 11 is also considered.

[Problems to be Solved by the Invention] The in-vehicle device must have a flexible structure capable of absorbing shock for the above-mentioned reasons, but on the other hand, there is a problem of noise, and a structural rigidity is required because the shield plate is attached. Inevitability is inevitable. In particular, the cut-and-raised claws 13 and the iris diaphragms 14 shown in FIGS. 9 and 11 have sufficient rigidity to receive the substrate 3 which is bent and deformed by the external force 15, and are not easily deformed. For this reason, there is a problem that the requirements are not satisfied in the impact test in which the impact is applied to the front panel 1 and the degree of absorption of the impact is checked.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a substrate supporting device that elastically supports the rear side of a substrate, absorbs an external force due to an impact, and also has an electromagnetic shield.

[Means for Solving the Problems] In order to achieve the above object, in the board supporting device of the present invention, a circuit board mounted on the rear side of the front panel substantially parallel to the panel surface and a support for supporting the circuit board from the rear side. An in-vehicle electronic device including a plate includes a support plate or a shield plate having a flexible portion that is deformed according to the bending of the circuit board due to a shocking external force from the front.

[Operation] The support plate in the first embodiment is formed with the stress concentrating portion that is deformed by receiving the external force due to the flexural deformation of the substrate. To deform the support plate. Therefore,
The impact applied to the panel surface deforms the flexible panel, the substrate, and the support plate, and the external force applied is sequentially absorbed during this deformation.

Further, in the second embodiment, the claws of the shield plate elastically supporting the substrate are designed to be deformed when an external force of a predetermined amount or more is applied, and the substrate is flexed and deformed rearward as in the first embodiment. It becomes possible, and the external force absorbing action at the time of deformation softens the impact.

[Embodiment] Hereinafter, the present invention will be described with reference to the drawings. 1 to 4 show a first embodiment of the invention, and FIGS. 5 to 7 show a second embodiment.

In the figure, the same components as those in FIG. 8 are designated by the same reference numerals, and the description thereof will be omitted.

First Embodiment FIG. 1 shows the top surface of a vehicle-mounted reproducing apparatus. In the figure, reference numeral 20 denotes a support plate that supports the rear side of the substrate 3 and electromagnetically shields the substrate 3. As shown in FIG. 2, the support plate 20 is formed by bending a thin metal plate into a box shape.
It is fixed so as to cover the rear of the substrate 3 mounted substantially parallel to the panel surface.

Side edge 24 where the support plate 20 is bent vertically in a box shape.
Has a space 29 so that it has a predetermined height, and a notch in which a part of the edge is cut out in a triangle in the approximate center part.
21 are formed. The notch 21 is a portion where stress is concentrated so that the support plate 20 can be deformed according to the bending deformation of the substrate 3. Therefore, when an excessive external force is applied to the substrate 3, the portion of the substrate 3 that is in contact with the cutout portion 21 is broken preferentially.

When a thinner metal plate is used to facilitate the deformation of the support plate 20, as shown in FIG. 3, the upper surface 25 is embossed 2 to apparently reinforce the plate thickness. The embossing 22 is formed in a line shape or a grid shape in the place where the electromagnetic shielding is most effectively obtained, excluding the stress concentration part. FIG. 3 (A) shows that the embossing 22 is formed so as to be convex inward.

The support plate 20 shown in FIG. 4 is designed so that the stress applied to the support plate 20 is concentrated in an arbitrary portion, and a plurality of elongated holes 23 are formed along the peripheral longitudinal direction of the side edge portion 24. It Slot
In the support plate 20 having the 23 formed therein, stress concentrates in the elongated holes 23 of the side edge portion 24 at the position where the stress 15 is applied to the substrate 3, the elongated holes 23 are crushed, and the entire supporting plate 20 is deformed.

The support plate 20 configured as described above and fixed to the substrate 3
Has a function of easily retracting to the rear when an external force of a predetermined amount or more is applied from the front, and an electromagnetic shielding function,
Even if a part of the body of the vehicle occupant comes into contact with the playback device,
The stress caused by the contact is sequentially absorbed by the flexible front panel 1, the flexible substrate 3, and the support plate 20, and the damage to the occupant is minimized. The reproducing device operates stably due to the electromagnetic shielding effect.

Second Embodiment A second embodiment shown in FIGS. 5 to 7 is constituted by a shield plate 30 which can achieve the intended purpose by a simpler method. FIG. 5 is a perspective view of the substrate 3 seen from the front side, and a shield plate supporting the substrate 3 behind the substrate 3.
30 are provided. A part of the shield plate 30 is cut out in the center thereof, and a tongue-shaped support claw 31 is formed. The support claw 31 has a height for escaping the electronic components such as the display control microcomputer 5 and the display drive IC 9 and elastically contacts the substrate 3. Then, the elastic coefficient of the support claw 31 is calculated in advance so that the claw 31 is deformed when a stress 15 higher than a predetermined value is applied from the substrate 3 side, and based on this result, the claws shown in FIGS. The width 32 and the bending angle 33 of the claw are set.

Next, FIG. 7 is a view showing a modified example of the supporting claws. Similarly, a part of the shield plate 30 is cut out to form an arcuate claw 34 having a free end bent and pushed in an arc shape. . The claw 34 has its free end elastically contacting the substrate 3 to support the rear side of the substrate 3, and when a stress 15 of a predetermined amount or more is applied from the substrate 3 side, the base of the claw 34 is deformed.

Therefore, also in the second embodiment, the shield plate 30 has both an electromagnetic shielding function and a shock absorbing function.

[Advantages of the Invention] As described above, according to the substrate supporting apparatus of the present invention, the supporting plate that supports the substrate from the rear side of the substrate and easily retracts to the rear side when an external force more than a predetermined amount is applied from the front side. Alternatively, since the shield plate that is deformed rearward is provided, even if an occupant of the vehicle comes into contact with the reproducing device, the shock due to the contact is absorbed and mitigated by the buffering action and deformation of the support plate or the shield plate.

Therefore, the in-vehicle device according to the present invention has an excellent effect that it can provide an in-vehicle device in which safety for passengers is secured in conformity with the vehicle safety operation standard.

[Brief description of drawings]

1 to 7 show an embodiment of the present invention, in which FIG. 1 is a top view of an in-vehicle reproducing device, FIGS. 2 to 4 are perspective views showing the structure of a supporting plate, and FIG. FIG. 6 is a perspective view showing the structure of the shield plate, and FIGS. 6 and 7 are views showing the support claws of the shield plate. 8 to 11 show a conventional example, which is shown in FIG.
FIG. 9 and FIG. 9 are top views of the on-vehicle reproducing apparatus, FIG. 10 is a perspective view showing stress applied to the substrate, and FIG. 11 is a view showing a diaphragm formed on the shield plate. 1 ... Front panel, 3 ... Substrate, 15 ... External force, 20 ... Support plate, 30 ... Shield plate, 31,34 ... Claws.

Claims (2)

(57) [Scope of utility model registration request] 1. An in-vehicle electronic device comprising a circuit board mounted on a rear side of a front panel substantially parallel to a panel surface, and a support plate for supporting the circuit board from a rear side by a shocking external force from the front side. A substrate supporting device comprising: a supporting plate having a flexible portion that deforms according to the bending of the circuit board. 2. An in-vehicle electronic device comprising a circuit board mounted on a rear side of a front panel substantially parallel to a panel surface, and a shield plate for supporting the circuit board from a rear side by an impact external force from the front side. A substrate supporting device comprising a shield plate having a flexible portion that deforms in accordance with the bending of the circuit board.