JPH0231803Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a case for housing a circuit board. In particular, the present invention relates to a circuit board storage case that can be used, for example, as an electromagnetic shielding case for a light-receiving block that uses light as an activation signal.

[Conventional technology]

Conventionally, this type of storage case, for example, a shield case that shields a light receiving block for remote control of a VTR device or television, has variations in the incident angle at which the light that is the operating signal can be received depending on the product, and There is a problem that there is variation in the possible distance range. That is, this type of light-receiving block generally has a window 9' provided in a cap 7' that covers a substrate 2', as schematically shown in FIG. The light-receiving element (light sensor) 1' on the window 9' receives light and operates, but the distance l (usually a minute distance) between the window 9' and the light-receiving element 1' varies depending on the product. Alternatively, the substrate 2' may be tilted as shown by the broken line 2'', resulting in variations in the incident angle range of the operating light and variations in the operating distance range between products. This can be solved by reliably positioning the board with the sensor and the cap with the light receiving window, and keeping the mutual positional relationship constant without variation.However, in the past, such reliable It was difficult to easily perform positioning.
This problem is a technical bottleneck, especially when it is desired to reduce the size and weight of the shield case or when using a ceramic substrate that is difficult to process. This is because ceramic substrates are generally difficult to process even if complicated processing is attempted for reliable positioning and fixing.

[Purpose of invention]

The purpose of the present invention is to solve the above-mentioned problems of the conventional technology, and to provide a storage case for circuit boards such as boards having sensors, which allows the board to be reliably and easily positioned and fixed regardless of the material of the board, and which is As a result, the mutual positional relationship between the board and the cap can be fixed without any variation, and therefore there are no assembly variations between products, and therefore, for example, products caused by assembly problems can be fixed. Variations in characteristics between the two (such as when used as a sensor case) can be suppressed. Our objective is to provide a stable and reliable circuit board storage case.

[Structure of the idea]

The above object is to provide a circuit board storage case that includes a board having an electric circuit, a base that supports the board, and a cap that covers the board. The board is supported by the cap, and a plurality of engaging claws are formed on the cap, and the engaging claws engage with the notches formed in the base by cutting and raising the supporting piece. This can be achieved by using a structure in which the cap is fixed.

[Effect of invention]

As a result of the above configuration, in the circuit board storage case of the present invention, the board is supported by a plurality of support pieces cut and raised on the base, so that the mutual positional relationship between the board and the base is reliably determined. In this case, since the support piece is formed by cutting and raising it, it can support the board without any problem even if the board is mounted on both sides, and is versatile.
Further, the substrate only needs to be processed so that it can be supported by this support piece, and since such processing can be easily performed, the present invention can be easily applied to substrates made of materials that are difficult to process. In addition, since the cap is fixed by engaging the plurality of engaging claws with the notches of the base, the mutual positional relationship between the cap and the board is reliably determined. Moreover, the notch in the base for this engagement is formed by cutting and raising the support piece for supporting the board from the base, so the notch can be formed at the same time by cutting and raising the support piece. It is extremely easy to process. Further, when the engaging claw of the cap is engaged with the notch, the support piece formed by cutting and bending can be used as a guide, so that reliable assembly can be achieved with a simple operation.

As described above, according to the present invention, since the board and the base and the cap and the base are reliably positioned relative to each other, the relative positions of the board, base, and cap are surely kept constant. , product-to-product variations are less likely to occur. Therefore, it is possible to suppress the occurrence of variations in characteristics between products.
Moreover, as mentioned above, such reliable positioning can be accomplished very simply and easily, which is very convenient. In particular, it can be said that the present invention can be suitably used when the circuit board storage structure is downsized and the entire structure is made smaller and lighter.

[Example of idea]

An embodiment of the present invention will be described below with reference to FIG. In this embodiment, the present invention is applied to a shield case for a light receiving block for remote control used in a VTR device or television.

This shield case includes a board 2 having a sensor 1 and other electric circuits, a base 5 supporting the board 2, and a cap 7 covering the board 2.

The board 2 in this example includes the sensor 1 (a photodiode is used in this example), an IC, a capacitor,
This is a circuit board assembly with lead pins etc. mounted on both sides. Ceramics can be used as the material for the substrate 2 itself.

The base 5 includes a plurality of support pieces 4 (four in the illustrated example).
A book) is cut up and set up. The support piece 4 supports the substrate 2 .

In this example, the substrate 2 is provided with a corresponding notch 3 for positioning and fixing, and by engaging the support piece 4 with this notch 3, the substrate 2 can be positioned and fixed to the base 5. It will be done. As shown in the figure, the supporting piece 4 of this example has a narrow tip and becomes an engaging part 4a that fits exactly into the notch 3. Therefore, such an engaging part 4a fits into the notch 3. Fitted and assembled. Since the engaging portion 4a is formed with a narrow width, the shoulder portion 4b is formed at the step between the engaging portion 4a and the engaging portion 4a.
is formed, and this shoulder portion 4b is attached to the substrate 2.
It plays a role of supporting the board 2 by coming into contact with the lower surface of the board. Since the base 5 in this example is made of a steel (or copper alloy or the like) plate, it is easy to form the support piece 4 in this shape. When assembling, fit this support piece 4 into the notch 3 of the board 2, position it in the plane direction (X, Y directions in the figure) and in the vertical direction (Z direction in the figure), and slightly bend the tip of the support piece 4. By engaging the engaging portion 4a with the notch 3, it can be easily fixed. This engaging portion 4a
Reliable positioning and fixing is achieved by the engagement of the shoulder portions 4b and the support of the lower surface of the substrate 2 by the shoulder portions 4b. The notch 3 of the substrate 2 in this example may be formed as a square hole in the continuous substrate before being divided into individual substrates. Forming such a square hole is easy, and is advantageous when it is desired to use it as a ceramic substrate material as in this example. Ceramics generally have poor processability compared to metals and resins, but this level of processing is easy.

In addition, although the board 2 in this example is a double-sided mounting board,
In the present invention, the substrate 2 is positioned and fixed by the cut and raised support pieces 4, so that it is easy to lift and support the substrate 2 without affecting the mounting on the lower surface as shown in the figure. Therefore, it can be said that the support of the lower surface of the board 2 by the shoulder portion 4b also plays an even greater role in the case of a double-sided mounting board.

On the other hand, a plurality of engaging claws 8 (four in the illustrated example) are formed on the cap 7. The cap 7 in this example is made of a steel plate, and the engaging pawl 8 can be easily machined. (The material of the cap may be phosphor bronze or other suitable material.)
This engaging claw 8 engages with the notch 6 of the base 5. The notch 6 of the base 5 is formed in the base 5 by cutting and raising the support piece 4 for supporting the substrate 2.

That is, when the support piece 4 is cut and raised from the base 5, a notch 6 is generated depending on the degree of the notch, but in the present invention, the engaging claw 8 of the cap 7 is inserted into the notch 6 by using this notch 6. By engaging, the cap 7 is positioned and fixed to the base 5. Therefore, the notch 6 can be formed at the same time as the support piece 4 is formed on the base 5, which is extremely simple in processing.

In this example, the depth d of the notch 6 is approximately the same as or slightly larger than the thickness w of the lower edge of the cap 7. In this way, the engaging claw 8
fits exactly into the notch 6, and the cap 7
The entire lower edge 7a of the portion other than the engaging claw 8 is placed in contact with the periphery of the upper surface of the base 5, so that the base 5 is stably assembled.

In addition, in the present invention, since the engaging pawl 8 of the cap 7 is engaged with the notch 6 left after cutting and raising the support piece 4 as described above, when assembling the cap 7, the support piece 4 is guided. The engaging claw 8 is cut out 6 as
can be adapted to Since the engaging claw 8 is inserted into the notch 6 left by the cut and raised support piece 4, when the engaging claw 8 is inserted as shown by arrow B in Fig. 1, the engaging claw 8 will be inserted exactly. It is inserted along the outer surface of the support piece 4, and as a result, the support piece 4 functions as a guide. For this reason, it is easy to fit the engaging claw 8 into the notch 6, and moreover, reliable positioning is achieved.

As shown in the figure, the cap 7 of this example just surrounds and covers the outer periphery of the substrate 2, so the support piece 4 having such a guiding function is attached to the base 5 described above.
Coupled with the structure in which the lower edge 7a of the cap 7 is in contact with the periphery of the upper surface, the consistency of the overall mutual positional relationship is further ensured.

In this example, the cap 7 is inserted in the direction of arrow B using the support piece 4 of the base 5 as a guide, and the engaging claw 8 of the cap 7 is inserted into the notch 6 to fit it, and the lower edge 7a of the cap 7 is inserted. is positioned at the place where it abuts against the upper surface of the base 5, and the engaging claw 8 is firmly caulked and fixed.

Because of the above-described configuration, the mutual positional relationship of the circuit board 2, base 5, and cap 7 is reliably determined in the circuit board storage case of this embodiment. The mutual relative positional relationship is constant in any of the X, Y, and Z directions in the figure, and variations from product to product are unlikely to occur. Therefore, in this example, since the application is to a light receiving block, the cap 7 is formed with a window 9 for receiving light, but since the positional relationship between the cap 7 and the substrate 2 is constant, the window of the cap 7 is The mutual relationship between 9 and the sensor (photodiode) 1 on the substrate 2 is also constant, and there is no variation in l as explained using FIG. The angular range of the light that operates depending on the product does not vary depending on the product, nor does the distance range vary, making it possible to maintain constant characteristics.

Even when the present invention is applied as a shield case for other members, variations in characteristics can be suppressed because the mutual positional relationship of the substrate 2, base 5, and cap 7 as described above is constant. Furthermore, even when applied to a general board storage case rather than as a shield case, the positional relationship between each component is constant and the assembly is reliable, so the case can be stable and highly reliable. Moreover, this effect can be achieved through extremely simple processing and assembly, which is advantageous in practice.

Further, according to this embodiment, since the substrate 2 is positioned and fixed using the support piece 4 cut and raised from the base, it is only necessary to form a corresponding notch 3 etc. in the substrate 2, and The board can be reliably positioned and fixed with a simple configuration. In particular, in order to achieve high-density mounting using means such as direct bonding of bare chips or printed resistors, it is currently appropriate to use a ceramic substrate such as an Al ₂ O ₃ substrate as the substrate 2. Ceramic substrates generally have problems in terms of processability, but by applying the present invention, it is possible to securely position and fix them with simple substrate processing, and it is suitable as a case for components mounted at high density using ceramic substrates. It can be said that. In addition, although the board 2 of this embodiment is mounted on both sides, the present invention is advantageous in that it can easily and securely position and fix the board even on a board mounted on both sides without any problems.

It should be noted that, as a matter of course, the present invention is not limited to the illustrated embodiment.

[Effect of idea]

As mentioned above, the circuit board storage case of the present invention is
A board having an electric circuit can be reliably and simply positioned and fixed regardless of the material of the board, and a cap covering the board can be reliably and simply positioned and fixed. Therefore, the mutual positional relationship of the substrate, cap, and base is determined without variation. Therefore, the parts are reliably assembled in a fixed positional relationship, and variations between products due to assembly problems can be suppressed. Also,
It has a wide range of applications, including substrates made of ceramic materials,
It can be suitably used for double-sided mounting boards, and has the effect of being highly versatile. Additionally, as a result, the board storage case can be made smaller and lighter, and the stability and reliability of the product can be further improved.

[Brief explanation of the drawing]

FIG. 1 is a partially exploded perspective view showing an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view for explaining the problems of the conventional example. 1... Sensor (photodiode), 2... Board, 3... Notch, 4... Support piece, 5... Base,
6...notch, 7...cap, 8...locking claw.

Claims (1)

[Scope of utility model registration request] It is equipped with a board having an electric circuit, a base that supports the board, and a cap that covers the board, and the base is provided with a plurality of support pieces cut and raised, and the support pieces support the board, and the cap covers the board. A plurality of engaging claws are formed on the cap, and the engaging claws engage with notches formed in the base by cutting and raising the support piece, thereby fixing the cap. A circuit board storage case.