Source: http://patents.com/us-4883920.html
Timestamp: 2014-09-19 05:52:12
Document Index: 361378999

Matched Legal Cases: ['art 11', 'art 11', 'art 11', 'arts 11', 'art 11', 'art 11', 'arts 11']

US Patent # 4,883,920. Chip type component installation structure - Patents.com
United States Patent 4,883,920
In the chip type component installation structure wherein chips are
arranged to be joined by solder to a fitting pattern provided on a printed
substrate, resist films are set separately in the space of the fitting
pattern in order to reduce the quantity of solder. The resist films are
set in the space of the fitting pattern separately, so that the structure
provides a lesser quantity of solder to join and fix chips, a continuous
solder band over the fitting pattern, and a lesser but sufficient quantity
of the solder. The structure prevents cracks and breakages of chips due to
the expansion and contraction of solder, increases the polarity of solder
against chips and electrodes, shortens the soldering time, and increases
the reliability of chip installation work.
Inventors: Tanabe; Takeshi (Nagaokakyo, JP), Hori; Toshio (Nagaokakyo, JP) Assignee:
07/200,374
Foreign Application Priority Data Jun 02, 1987
62-138612
174/263 ; 228/180.1; 228/180.21; 361/774; 361/777
Current International Class: H05K 3/34 (20060101); H05K 001/18 ()
Field of Search: 361/404,406,411,409 174/68.5 228/180.1,180.2,215
Yonezuka et al.
Kinsky et al.
Yamamotot et al.
Sawairi et al.
4694121
Claims We claim:1. A chip type component installation arrangement, comprising:
a substrate having a fitting pattern;
a component having an electrode for connection to said fitting pattern of said substrate;
at least two resist film portions, a first said resist film portion disposed on and extending along said fitting pattern and having opposite lateral sides, and both said resist film portions disposed so as to form a gap therebetween on said
fitting pattern;
a solder connection portion connecting said electrode to said fitting pattern, said solder connection portion disposed along one lateral side of said first resist film portion and extending continuously therefrom through said gap between said
resist film portions to the opposite lateral side of said first resist film portion.
2. The chip type component installation arrangement as set forth in claim 1, wherein:
said first resist film extends from a position laterally outside of the area of said fitting pattern on said substrate linearly into said solder connection portion to a position inside said fitting pattern.
3. The chip type component installation arrangement as set forth in claim 1, wherein:
said first resist film is completely laterally surrounded by said solder of said solder connection portion.
4. The chip type component installation arrangement as set forth in claim 1, wherein:
both said resist film portions extend from positions substantially opposite but laterally offset with respect to each other into said solder connection portion.
5. The chip component installation arrangement as set forth in claim 1, wherein:
both said resist film portions extend from positions opposite each other laterally outside of the area of said fitting pattern toward each other into said solder connection portion to a position inside said fitting pattern, each said resist film
portion having an end spaced from the end of the opposite said resist film to form said gap.
6. A chip type component installation arrangement, comprising:
a fitting pattern on said substrate, said fitting pattern adapted to be connected to electrodes of a component by soldering, and having a fitting pattern soldering area for connection to the electrode;
said soldering area of said fitting pattern comprising an area uncovered by said resist film portions for receiving solder thereon, said area extending continuously along one lateral side of said first resist film portion, from said one lateral
side through said gap between said resist film portions, and to the opposite lateral side of said first resist film portion. Description BACKGROUND OF THE INVENTION
For instance, when fitting chip type electronic components such as laminated capacitors and chip resistors on a printed substrate, it is common to use an installation structure that provides a fitting pattern 3 on a printed substrate 1 at a
fitting position of an electronic component 2, and fit and fix electrodes 4 of the component 2 to the fitting pattern 3 by solder 5, as shown in FIGS. 10 to 13.
On the installation structure, it was inevitable to use a large quantity of solder 5 in the case of a close arrangement between the chip type electronic component 2 and a chassis 6 as shown in FIGS. 10 and 11 or in the case of a parallel
arrangement between plural electronic components 2, 2 as shown in FIGS. 12 and 13.
The conventional way to solve these problems was to widen the distance between the electronic component 2 and the chassis 6, or between the adjacent electronic components 2, 2, as shown in FIGS. 14 and 17, corresponding to a widening of the
fitting pattern 3, and paint a resist film 7 so as to separate the patterns 3 and reduce the respective solder quantity 5, as shown in FIGS. 14 and 16.
But the problem is such that the band of resist film 7 across and over the fitting pattern 3 causes a lack of solder 5 due to the reduction of the soldering area. This weakens the required fitting strength and the electric connection of
electronic component 2. On the contrary, excessive solder may rise upon the resist film 7 and break the insulation of the resist film.
It is a second object of the present invention to provide a chip type component installation structure which uses an optimum quantity of solder, wherein an excessive amount of solder can be controlled while securing the necessary absolute
quantity of solder.
It is a fourth object of the present invention to provide a chip type component installation structure which can prevent cracks and breakage of chip components due to the thermal expansion and contraction of solder. BRIEF DESCRIPTION OF
FIGS. 10 to 17 are plan views and sectional views of conventional installation structures. DESCRIPTION OF THE PREFERRED EMBODIMENT
As shown in FIGS. 1 to 9, a fitting pattern 3 for electronic component 2 is provided on a printed substrate 1, and in a fitting pattern soldering area of the pattern 3 is provided a resist film 17 to reduce the quantity of soldering used to
connect component 2 to the fitting pattern 3.
The resist film 17 provides a cut open part 11 on the upper side of the fitting pattern 3. Cut open part 11 thus connects the solder on both sides of the resist film 17 so that the solder is not separated, and connects retains a reasonable
quantity of the solder on the fitting pattern. Furthermore, it is possible to control the quantity of the solder by the design of the shape and location of the cut open part 11.
The shape and location of the resist film 17 and the number of cut open parts 11 can be selected freely, as shown in the drawings. Of course, the extent of the resist films 17 and the size of the open part 11 are chosen in conformance with the
objects of the invention, i.e. reducing the effect of thermal expansion on the component(s) 2 while still have a sufficient quantity of solder to provide an adequate fitting strength of the solder connection.
Referring to FIG. 2 the resist film 17 is projected in a straight line from both the sides of the fitting pattern 3 and is cut open at the middle position 11. Referring to FIG. 3, the tips of both resist films 17 are round shaped, and FIG. 4
shown an example having sharpened points.
Referring to FIGS. 7 and 8, resist film 17 are on both sides, arranged alternately, i.e. offset with respect to each other, and the cut open part 11 is formed therebetween. FIG. 9 shows an example wherein isolated resist films 17 are set in, or
form, cut open parts 11 on the fitting pattern 3.
As mentioned above, when installing the chip type electronic component 2 on the printed substrate 1, the fitting pattern 3 can be soldered to the electrode 4 of the electronic component 2 in a manner rendering it possible to reduce the quantity
of solder. This is done by the resist films 17, forming a continuous solder band on both sides of the resist films 17, preventing excess solder, and securing the absolute necessary quantity of solder, by forming the cut open part(s) 11. By continuous
is meant that the solder band on both sides is connected and uninterrupted, via the solder in gap 11.
The installation structure provides the cut open part of painted resist films at the fitting pattern on the printed substrate, as a result of which it becomes possible to reduce the solder quantity used for installing the electronic component on
the printed substrate, preventing cracks and breakages of the electronic components due to the expansion and contraction of the solder.
Also, the cut open part of the resist films makes it possible to prevent the lack of an absolute quantity of solder, to limit an excessive quantity of solder, to improve the polarity against the electrodes of the electronic components because of
non-separation of the solder and to shorten the soldering time.
Resist films are separately provided on the fitting pattern. Therefore, even when electronic components and chassis or two electronic components are more narrowly spaced as compared with conventional fitting structures, space for the electronic
components to be applied can be reduced without an excessive quantity of solder.
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