JP2005235939A - Electronic apparatus equipped with circuit board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a circuit board which has resistivity against bending stress such as warpage and in which peelability is improved in a circuit pattern and various electronic components installed in the circuit board. <P>SOLUTION: The various electronic components are mounted on the rectangular circuit board 10 fitted to an electronic apparatus 1, and the circuit pattern 12 having conductivity on a surface is formed. A plurality of slanting ellipse holes 15 which are slantingly arranged with respect to the circuit board 10 are formed in the short-hand direction of the circuit board 10. Thus, bending in a vertical direction to the circuit board 10 is effectively set free, and damage to the circuit board 10 and the peeling of the circuit pattern 12 from the circuit board 10 can be prevented. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention is an electronic device such as a television receiver or a DVD device with a built-in circuit board, in particular, a slanted elliptical through hole is formed in the circuit board so that the circuit board is bent and warped. In this case, the bending stress acting on the circuit board is prevented from escaping from the through hole and being damaged, and the circuit pattern and various electronic components provided on the surface of the circuit board are prevented from being peeled off from the circuit board. The present invention relates to an electronic device including a circuit board.

  Generally used electronic devices and the like have relatively large and heavy transformers and other electronic components mounted on a circuit board, and a plurality of connection terminals protruding from various electronic components are provided on the circuit board. Each circuit pattern is connected by soldering or the like.

  By the way, in the circuit board 100 conventionally used shown in FIG.5 and FIG.6, the shape of the main body is often formed in a relatively long rectangular shape such as a rectangle, and there are various types on the surface of the circuit board. A device for mounting electronic components or the like is used, and as shown in FIG. 5, a single-character linear slit hole 101, or as shown in FIG. It is known that a plurality of continuous slit holes 102 are formed in parallel along any direction.

  Further, in Patent Document 1, a cut groove is formed in a circuit board, and even if bending stress is applied to the circuit board, the bending stress is released from the cut groove, and stress is applied to the connection part where the electronic component is connected to the circuit board. The thing which suppresses that it concentrates and prevents that an electronic component peels from a circuit board is disclosed. Patent Document 2 discloses a circuit board provided with a slit for the same purpose of preventing destruction of components.

JP-A-8-186142 Japanese Utility Model Publication No. 5-95074

  However, for a circuit board having a shape that is relatively long in the longitudinal direction and one-letter type slit hole formed in the same direction as the longitudinal direction, even if the slit hole is formed in the circuit board, the circuit board However, if a single-character slit hole is formed in the short direction of the circuit board, the circuit board bends in the vertical direction by external force, Since bending stress is locally concentrated in the slit hole, when strong bending stress is applied, the circuit board may be broken and damaged. Even if the circuit board is not damaged, the circuit pattern provided on the circuit board may be peeled off, or a heavy electronic component such as a transformer may be mounted on the circuit board and soldered. In the state of being attached to the pattern, there has been a problem that the connection part attached by soldering is removed along with the bending of the circuit board.

  The present invention solves the above-mentioned problem, by forming a diagonal through hole obliquely with respect to the circuit board, when the bending stress to be bent acts on the circuit board, the bending stress is released, By reducing the concentration of bending stress locally on the circuit pattern of the circuit board and various electronic components, it is resistant to bending stress such as warping and the resistance of the circuit pattern and various electronic components provided on the circuit board. The present invention relates to an electronic device including a circuit board with improved peelability.

  According to a first aspect of the present invention, there is provided an electronic apparatus including the circuit board, wherein a circuit pattern is provided on a surface of a substantially rectangular circuit board mounted in the electronic apparatus, and various electronic components connected to the circuit pattern are connected to the circuit. A plurality of slit-shaped oblique through holes mounted on a substrate and arranged obliquely on the circuit board are arranged in the short direction of the circuit board.

  With the configuration of claim 1, when the circuit board is bent due to an external factor, the stress is concentrated in the range of the oblique through holes arranged in a plurality without locally concentrating the bending stress on a specific part of the circuit board. Therefore, the bending stress can be released, so that the circuit board is held in the electronic device without being damaged.

  An electronic device comprising the circuit board according to claim 2 of the present invention is the electronic device comprising the circuit board according to claim 1, wherein adjacent end portions of the oblique through holes overlap in the longitudinal direction of the circuit board. It is characterized by being arranged at a position.

  According to the configuration of the second aspect, since the oblique through holes are arranged so as to overlap with the longitudinal direction of the circuit board, the oblique through holes are arranged so as not to be interrupted in the short direction of the circuit board. At the time of bending, the stress can be concentrated more than the range where the oblique through holes are formed, and the bending stress can be released.

  An electronic device comprising the circuit board according to claim 3 of the present invention is the electronic device comprising the circuit board according to claim 2, wherein the overlapping width of the adjacent end portions is set to 1 to 3 mm, preferably 2 mm. Features.

  According to the configuration of claim 3, when a load is applied to the circuit board, the bending stress is absorbed by the oblique through hole.

  An electronic device provided with the circuit board according to claim 4 of the present invention is an electronic device provided with the circuit board according to any one of claims 1 to 3, wherein one of the various electronic components is: A plurality of connection terminals connected to the circuit pattern are juxtaposed at intervals to form an insertion hole for inserting the connection terminal in the circuit pattern, and the insertion hole is spaced in the longitudinal direction of the circuit board. The oblique through holes are formed between the connection terminals that are arranged in parallel in two rows and are inserted into the insertion holes.

  According to the configuration of the fourth aspect, since the oblique through holes are formed between the two rows of connection terminals provided in the electronic component, a bending stress acts on the connection terminal when the circuit board is bent due to the weight of the electronic component. To reduce. As a result, the connection portion between the connection terminal and the circuit pattern, which is weak in strength, is not damaged.

  According to a fifth aspect of the present invention, there is provided an electronic apparatus including the circuit board according to the fourth aspect, wherein the electronic component is a transformer.

  According to the configuration of claim 5, the transformer includes an iron core and a plurality of windings. For example, the transformer is very heavy compared to a small electronic component such as a resistor or a capacitor. Since the deflection of the circuit board can be effectively reduced by the oblique through hole, the transformer does not peel from the circuit board.

  According to the electronic apparatus having the circuit board of claim 1 of the present invention, a circuit pattern is provided on the surface of a substantially rectangular circuit board attached to the electronic apparatus, and various electronic components connected to the circuit pattern are provided. Since a plurality of slit-shaped oblique through holes mounted on the circuit board and arranged obliquely on the circuit board are arranged in the short direction of the circuit board, when the circuit board is bent due to transportation, dropping, etc. It is possible to provide an electronic device including a circuit board that is resistant to vibration and impact without causing a failure.

  According to a second aspect of the present invention, there is provided an electronic apparatus including the circuit board according to the first aspect, wherein the adjacent end portions of the oblique through holes overlap with each other in the longitudinal direction of the circuit board. Since the inclined through holes are arranged so as not to be interrupted in the short direction of the circuit board, the bending stress can be more easily released.

  Since the electronic device provided with the circuit board according to claim 3 of the present invention is an electronic machine provided with the circuit board according to claim 2, the overlapping width of the adjacent end portions is set to 1 to 3 mm, preferably 2 mm. When a load is applied to the circuit board, the bending stress is effectively absorbed by the oblique through holes, so that the peel resistance of the circuit pattern and various electronic components can be improved.

  According to a fourth aspect of the present invention, there is provided an electronic apparatus including the circuit board according to the first aspect, wherein one of the various electronic components is connected to the circuit pattern. A plurality of connection terminals are arranged in parallel at intervals to form an insertion hole through which the connection terminal is inserted, and the insertion holes are arranged in parallel in two rows at intervals in the longitudinal direction of the circuit board. And since the said diagonal through-hole was formed between the connection terminals penetrated by this penetration hole, the connection part of a weak connection terminal and a circuit pattern is not damaged.

  The electronic device including the circuit board according to claim 5 of the present invention is such a heavy electronic component because the electronic component is a transformer in the electronic device including the circuit board according to claim 4. However, peeling from the circuit board can be prevented.

  Hereinafter, an embodiment as the best mode for carrying out the present invention will be described below with reference to FIGS. Needless to say, the present invention can be easily applied to configurations other than those described in the embodiments without departing from the spirit of the invention.

  FIG. 1 is a bottom view showing an example of a circuit board provided in an electronic apparatus such as a television receiver and a DVD device, and FIG. 2 is an enlarged view of a main part showing a through hole formed in the circuit board. It is.

  A screw hole 11 is formed in the vicinity of the corner of the circuit board 10 in this embodiment, and the circuit board 10 is attached and fixed to the inside of the cabinet 2 that forms the outer shape of the electronic device 1 with screws 9 or the like. Various electronic components such as a transformer 20, a resistor, and a capacitor are mounted on the upper surface of the circuit board 10. As shown in FIG. 1, the circuit pattern 12 extends over almost the entire circumference of the lower surface of the circuit board 10. The circuit board is made of an elastic member such as synthetic resin such as paper phenol or glass cloth, and is a thin circuit board 10 having a thickness of 1.6 mm and long in the longitudinal direction. Various electronic parts such as resistors and capacitors are not shown in the gist of the present invention, and are not shown.

  The circuit board 10 is formed with an insertion hole 13 through which a connection terminal 21 provided in various electronic components such as the transformer 20 is inserted. The connection terminal 21 is inserted into the insertion hole 13 and is formed on the lower surface of the circuit board. The circuit pattern 12 is connected and attached by soldering.

  By the way, the transformer 20 will be described in detail. The transformer 20 is provided at substantially the center in the longitudinal direction of the circuit board 10 and constitutes an iron core and a plurality of windings in the electronic components mounted on the circuit board 10. Accordingly, a plurality of connection terminals 21 protruding from the transformer 20 toward the circuit board 10 side are arranged in the longitudinal direction of the circuit board 10 as shown in FIG. Two rows of connection terminals 21 arranged in parallel at intervals are provided, and the insertion holes 13 provided in the circuit board 10 corresponding to the positions where the connection terminals 21 are inserted are similarly formed in parallel in two rows. Has been. And it is attached to the circuit pattern 12 by soldering with the connection terminal 21 inserted in the insertion hole 13. The rows of the insertion holes 13 and the connection terminals 21 are arranged so as to be long in the short direction of the circuit board 10, which is orthogonal to the longitudinal direction of the circuit board 10.

  Further, there is a gap between the transformer 20 and the circuit board 10, the position where the lower surface of the transformer 20 faces, and a plurality of oblique through holes 15 in the center of the transformer 20 located in the short direction of the circuit board 10. The oblique through-holes 15 are formed between the connection terminals 21 that are regularly arranged and inserted into the insertion holes 13 that are arranged in parallel in the longitudinal direction of the circuit board in two rows at intervals.

  The oblique through holes 15 and the through holes 16 to be described later in this embodiment are thin in the longitudinal direction so that both end portions 15a and 16a have the same shape so as not to be damaged when the circuit board 10 is bent. It is formed in an arc shape and is formed in an elliptical shape in which both end portions 15a and 16a are connected in a straight line. In addition, the length in the longitudinal direction of the through holes 15 and 16 in the present embodiment is desirably 5 mm or more, and is actually formed to 10 mm. Further, the width of the through holes 15 and 16 is preferably 0.7 mm to 1.5 mm, and is actually 1.2 mm.

  Further, the end 15 a of each oblique through-hole 15 overlaps with the oblique through-hole 15 and the ends 15 a and 16 a of the through-hole 16 arranged adjacent to each other on a straight line in the longitudinal direction of the circuit board 10. Are arranged. In this embodiment, the overlapping portions a arranged so as to overlap each other are arranged so as to overlap each other by about 1 to 3 mm in the short direction of the circuit board 10 as shown in FIG. , 15a, 15a, and 16a are spaced apart from each other by a distance equal to or greater than the thickness of the circuit board 10, that is, in the present embodiment, the distance between the overlapping parts a is 1.6 mm or more. When the bending stress is applied in the vertical direction of the circuit board 10, it is not broken or broken. The interval between the overlapping portions a is preferably 1 to 3 mm, and most preferably 2 mm. By arranging in this way, the bending stress to the circuit board 10 can be effectively absorbed by the oblique through holes 15 and the through holes 16 and released.

  Next, the effect | action which concerns on the said structure is demonstrated. When various electronic components such as the transformer 20 are mounted on the circuit board 10, the screws 9 are fastened and attached to the screw holes 11 formed in the corners of the circuit board 10 at predetermined positions of the cabinet 2 of the electronic device 1. In this case, if the screw 9 is tightened too much, the circuit board 10 will bend. In addition, when the vehicle is transported by an automobile or the like, the circuit board 10 is bent as the automobile shakes. Therefore, the oblique through holes 15 that are arranged in the short direction of the circuit board 10 and are inclined with respect to the circuit board 10 are formed in the circuit board 10, so that the bending stress to the circuit board 10 is reduced. The bending stress is concentrated on the oblique through hole 15 formed in the circuit board 10 on which no circuit pattern or the like is provided so as not to act on various electronic components and the circuit pattern 12 mounted on the circuit board 10. The bending stress of the circuit board 10 can be effectively relieved by releasing the bending stress from the oblique through hole 15. In this embodiment, as shown in FIG. 1, the oblique through holes 15 that are oblique to the circuit board 10 are regularly arranged in the short direction of the circuit board 10. As in the modification shown, even if the elongated through holes 16 are provided between the oblique through holes 15 in the same direction as the short side of the circuit board 10, the bending of the circuit board 10 is effectively reduced in the same manner as the circuit board 10 described above. Can be relaxed. Therefore, as in the conventional example shown in FIG. 5, a single-character slit hole 101 is formed horizontally with the short direction of the circuit board 100, and the bending stress when the circuit board 100 is bent is caused by this slit. Since the bending stress to the circuit board 10 can be reduced along the hole 101 without bending stress being concentrated locally, even if a strong bending stress is applied to the circuit board 10. 10 can be prevented from being damaged. Further, since the circuit board 10 and the conductive circuit pattern 12 are generally made of different materials, if the circuit board 12 is repeatedly bent, the circuit pattern 12 is peeled off from the circuit board 10 (particularly the connection of the transformer 20). The terminal 21 is often peeled off from the base of the pin), but even if a bending stress from the outside repeatedly acts on the circuit board 10, the part where the circuit pattern 12 is not arranged, in this embodiment By providing the oblique through holes 15 and the through holes 16 between the connection terminals 21 provided so as to be arranged in two rows protruding from the transformer 20 which is one of various electronic components, the circuit board 10 is provided. It is possible to avoid bending stress from being concentrated on the circuit pattern 12 provided in the circuit board and the connection parts of various electronic components soldered to the circuit pattern 12, so that the circuit board 0 it is possible to prevent the circuit pattern 12 is peeled off. Further, the overlapping portion a is arranged so as to substantially overlap in the same direction as the longitudinal direction of the circuit board 10, and a plurality of oblique through holes 15 and through holes 16 are regularly arranged in a short direction of the circuit board 10 in a relatively wide range. Since they are arranged, bending stress can be concentrated in a predetermined range in the short direction of the circuit board 10, and damage to the circuit board 10 can be prevented. Therefore, even if a bending stress is applied to bend the circuit board 10, it is possible to reliably prevent the circuit pattern 12 from peeling from the circuit board 10 and to prevent the circuit board 10 and the circuit pattern 12 from being damaged. Therefore, various electronic devices 1 including such a circuit board 10 can avoid causing a failure.

  As described above, the electronic device 1 including the circuit board 10 according to the present embodiment is strong in strength against bending of the circuit board 10 even when a large electronic component such as the transformer 20 is mounted on the circuit board 10. The influence of bending stress such as warping to a portion that cannot be said can be reduced by escaping from a desired position by forming at least the oblique through hole. It is possible to provide the circuit board 10 having excellent peeling resistance without peeling, and it is possible to prevent the electronic device 1 including these circuit boards 10 from being damaged.

  Further, as an effect of the embodiment, since a plurality of the oblique through holes 15 and the through holes 16 penetrating up and down of the circuit board 10 are formed, the air permeability is improved. Heat and gas generated by soldering when various electronic components such as the provided transformer 20 are attached to the circuit board 10 can be effectively radiated from the through holes 15 and 16.

  Furthermore, since the strength of the circuit board 10 can be secured in both the vertical direction and the horizontal direction of the circuit board 10, even if a large electronic component such as the transformer 20 is mounted on the thin circuit board 10, warping or It is possible to provide the circuit board 10 that is strong in peeling of the circuit pattern 12 and is not easily damaged and excellent in strength. Therefore, it is possible to provide the electronic apparatus 1 including the circuit board 10 that can avoid a strong failure against vibrations and shocks such as transportation and dropping.

  Note that elongated through holes 16 are provided alternately in parallel with the oblique through holes 15 in the short direction of the circuit board 10 between the oblique through holes 15 arranged obliquely with respect to the circuit board 10. 4 has substantially the same shape as that of the oblique through hole 15, and as shown in FIG. 4, the adjacent through hole 16 and the end of the oblique through hole 15 have one overlapping portion a in the longitudinal direction of the circuit board 10. It arrange | positions so that it may overlap by about 3 mm, The effect similar to the Example mentioned above can be show | played also in this case.

  As mentioned above, although one Example of this invention was explained in full detail, this invention is not limited to the said Example, A various deformation | transformation implementation is possible within the range of the summary of this invention. For example, the shape of the oblique elliptic hole 15 may be a lightning bolt. Further, it is not necessary to form all the directions of the oblique through-holes 15 provided obliquely with respect to the circuit board 10 in the same direction. For example, the direction can be appropriately changed such as changing the direction alternately.

It is a bottom view which shows the circuit board with which the electronic device of this invention is equipped. It is a principal part enlarged view which shows the diagonal through-hole currently formed in the circuit board same as the above. It is a bottom view which shows the circuit board provided in the electronic device of another Example. It is a principal part enlarged view which shows a circuit board same as the above. It is a top view of a circuit board which shows a conventional example. It is a top view of a circuit board which shows a conventional example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electronic device 10 Circuit board 12 Circuit pattern 13 Insertion hole 15 Oblique through-hole 15a, 16a End part 20 Transformer (electronic component)
21 Connection terminal

Claims (5)

  A circuit pattern is provided on the surface of a substantially rectangular circuit board mounted in an electronic device, and various electronic components connected to the circuit pattern are mounted on the circuit board, and slit-like shapes are arranged obliquely on the circuit board. An electronic apparatus comprising a circuit board, wherein a plurality of oblique through holes are arranged in a short direction of the circuit board.   2. The electronic apparatus having a circuit board according to claim 1, wherein adjacent end portions of the oblique through holes are arranged at positions overlapping in a longitudinal direction of the circuit board.   3. The electronic apparatus having a circuit board according to claim 2, wherein an overlapping width of the adjacent end portions is set to 1 to 3 mm, preferably 2 mm.   In one of the various electronic components, a plurality of connection terminals connected to the circuit pattern are arranged in parallel with each other, forming an insertion hole for inserting the connection terminal in the circuit pattern, and the insertion hole 4. The diagonal through holes are formed between the connection terminals inserted through the insertion holes in parallel with each other in two rows at intervals in the longitudinal direction of the circuit board. An electronic device comprising the circuit board according to the item.   The electronic device having a circuit board according to claim 4, wherein the electronic component is a transformer.

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