JP2002171039A - Circuit board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save labor and time of designing and manufacturing a plurality of circuit boards. SOLUTION: Circuit patterns 31-35 are printed on a dielectric substrate 51, so that a SAW filter and a dielectric filter are mounted alternately on the dielectric substrate 51. Cutouts 41-44 are formed which can be selectively connected by soldering. When the SAW filter is mounted, the cutouts 41 and 43 are soldered to connect a land 9 and the circuit patterns 31, 33, and 35. When the dielectric filter is mounted, the cutouts 42 and 44 are soldered to connect the land 9 and the circuit patterns 32, 34, and 35.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a circuit board,
In particular, the present invention relates to a circuit board on which a plurality of types of filter elements can be mounted.

[0002]

2. Description of the Related Art In order to satisfy specifications required by a customer, a band-pass filter having the same function and effect as a SAW filter 11 shown in FIG. 4 and a dielectric filter 12 shown in FIG. A circuit board may be realized by replacing a plurality of types of filter elements having different shapes and terminal arrangements due to a difference in principle or the like. In such a case, conventionally, wiring such as a circuit pattern is performed for each shape and terminal arrangement of each filter element, and a plurality of circuit boards are designed and arranged.

[0003]

However, the design and manufacture of these plurality of circuit boards required a great deal of labor and time. In view of these problems, the present invention provides a circuit board that can replace and mount a plurality of types of filter elements on a single circuit board, and can save time and effort in designing and manufacturing a plurality of circuit boards. Make it an issue.

[0004]

According to a first aspect of the present invention, there is provided a circuit in which a plurality of types of filter elements having different terminal positions are formed on a dielectric substrate so as to be interchangeable. The circuit board is provided with a notch that can be selectively connected by soldering in the circuit pattern, and the circuit pattern can be connected by soldering in accordance with the mounted filter element of the plurality of types of filter elements.

According to a second aspect of the present invention, in the first aspect, the plurality of types of filter elements are constituted by a SAW filter element and a dielectric filter element.

According to a third aspect of the present invention, in the first or second aspect of the invention, when a circuit pattern to be selected is formed by branching, a cut is provided at the branch point.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1A and 1B show a printed circuit board on which a circuit pattern is printed and formed on a dielectric substrate, as an example of a circuit board according to the present invention, wherein FIG. 1A shows an element surface on which a filter element is mounted, and FIG. , (C) shows the back surface. As shown in FIG. 1B, the printed circuit board 50
This is a double-sided substrate structure in which lands and circuit patterns made of thin-film conductors are printed and formed on both surfaces of the dielectric substrate 51. The SAW filter 11 shown in FIG. 4 and the dielectric filter 12 shown in FIG. It is configured such that the types of bandpass filters can be replaced. That is, the terminals 11 a to 11 a of the SAW filter 11 are provided on the dielectric substrate 51.
Through holes 22a to 22d formed in a conductor tube are provided so as to allow insertion of 11d and matching the hole diameter and interval. On the element surface shown in FIG. 1A, lands 6 and lands 7 are formed by printing as signal input terminals and signal output terminals of the printed circuit board 50. Each terminal of the dielectric filter 12 mounted on the surface is printed. The lands 24a to 24h, which are in contact with the respective 12a to 12h and are fixed and fixed by soldering, are printed and formed. The lands 24a to 24h are fixedly formed around the lands 6, 7 and the through holes 22a, 22d so that they do not make contact with each other. Pattern 52 having an opening formed as described above is printed. The GND pattern 52 is formed integrally with the lands 24a, 24b, 24d, 24e, 24f, and 24h, and is formed so as to be in contact with the through holes 22b and 22c.

Next, on the back surface shown in FIG. 1C, lands 9 and 10 are connected to lands 6 and 7 on the element surface and a dielectric substrate 51, respectively.
And lands 25a to 25h are printed at symmetrical positions between the lands 24a to 24h on the element surface and the dielectric substrate 51. Further, the circuit pattern branches off from the land 9 and is connected to the circuit pattern 31 connected to the through hole 22a through a notch 41 (notches 42, 43, and 44 also described later), and to the land 25c through the notch 42. The circuit pattern 32 is formed by printing,
And a circuit pattern 33 extending from the through hole 22d.
Merges with the circuit pattern 35 through the cut 43, and similarly, the circuit pattern 34 extending from the land 25 g merges with the circuit pattern 35 through the cut 44 and is formed so as to be connected to the land 10. A GND pattern 53 having openings formed at regular intervals around the lands 9, 10, the lands 25c and 25g, the through holes 22a and 22d, and the circuit patterns 31 to 35 so as not to make contact therewith. Is formed by printing. In addition, GN
D patterns 53 are lands 25a, 25b, 25d, 25
e, 25f, and 25h, and are formed so as to be in contact with and conductive to the through holes 22b, 22c.

The lands 6 and the lands 7 are penetrated through the dielectric substrate 51, and the lands and circuit patterns provided on the element surface and the back surface are connected to each other by through holes 8 (indicated by black circles in the drawing). Lands 9 and 10 are connected. The through hole 8 is further provided with a land 24 on the element surface.
a, 24b, 24d, 24e, 24f, 24h and lands 25a, 25b, 25d, 25e, 25f, 25 on the back surface
h, the land 24c is connected to the land 25c, and the land 24g is connected to the land 25g. Further, through holes 8 connecting the GND pattern 52 and the GND pattern 53 are also provided at regular intervals.

Here, the cut 41 divides the land 9 and the circuit pattern 31 and the cut 42 divides the land 9 and the circuit pattern 32 into a non-conductive state. Notches 41, 4
2 is approximately 1 which can be made conductive by soldering.
mm, and a position where a signal input from the land 6 via the land 9 is reflected to cause no transmission loss, that is, as shown in the figure, the land 9 and the circuit patterns 31 and 32 Is provided at the branch point. Similarly,
The notch 43 divides the circuit pattern 33 and the circuit pattern 35 into a non-conductive state, and the notch 44 divides the circuit pattern 34 and the circuit pattern 35 into a non-conductive state. For example, when one cut 43 is made conductive by soldering, the other cut 44 is provided at a branch point of the cut 43 so as not to generate an unnecessary circuit pattern portion that causes reflection.

FIGS. 2A and 2B are mounting diagrams in which the SAW filter 11 is actually arranged on the printed circuit board 50. FIG. 2A shows an element surface on which elements are mounted, FIG. 2B shows a side surface, and FIG. As shown in FIGS. 2A and 2B, the SAW filter 11 is mounted on the printed circuit board 50 from the element surface side. Then, as shown in FIG. 2 (c), the terminals 11a to 11d of the SAW filter 11 are inserted into the through holes 22a to 22d to make contact conduction, and by soldering,
It is fixed to the printed circuit board 50. Also, the cuts 41 and 43 are soldered, and the land 9 and the circuit pattern 31 and the circuit pattern 33 and the land 10 are electrically connected via the circuit pattern 35. The cuts 42 and 44 are left open without soldering. I do.

Therefore, the signal input from the land 6 is
The signal is input to the input terminal 11a of the SAW filter 11 through the circuit pattern 31 via the land 9, and the output terminal 11d
Are output from the lands 7 through the lands 10 through the circuit patterns 33 and 35 as output signals from which other than the required frequency band has been removed. As described above, the input signal can obtain a band-pass effect by mounting the SAW filter 11 on the printed circuit board 50.

FIGS. 3A and 3B are mounting diagrams in which the dielectric filter 12 is actually arranged on the printed circuit board 50. FIG. 3A shows an element surface on which elements are mounted, FIG. 3B shows a side surface, and FIG. . As shown in FIGS. 3A and 3B, the dielectric filter 12 is mounted on the printed circuit board 50 from the element surface side.
Further, the terminals 12a to 12h are brought into contact with the lands 24a to 24h, and are fixed to the printed circuit board 50 by soldering. Then, as shown in FIG. 3 (c), the cuts 42 and 44 are soldered, and the circuit pattern 34 via the land 9 and the circuit pattern 32 and the circuit pattern 35.
And the land 10 are electrically connected, and the cuts 41 and 43 are left open without soldering.

Therefore, the signal input from the land 6 is
The signal is input to the input terminal 12c of the dielectric filter 12 through the circuit pattern 32 via the land 9, and is output to the output terminal 12g.
Are output from the lands 7 through the lands 10 through the circuit patterns 34 and 35 as output signals from which the components other than the required frequency band have been removed. In this way, the input signal can obtain a band-pass effect by mounting the dielectric filter 12 on the printed circuit board 50.

The cuts 41 to 44 may be connected by soldering only, or a conductor formed separately according to the cut shape may be connected to the cut by soldering. .

Therefore, as described above, by providing cuts that can be selectively connected to the circuit pattern by soldering, the two types of band-pass filters of the SAW filter 11 and the dielectric filter 12 having different terminal positions can be selectively provided. Since the printed circuit board 50 can be configured so as to be replaceable, the labor and time for designing and manufacturing the printed circuit board for each filter element can be saved, and the maintenance of the printed circuit board is reduced to the burden of only one printed circuit board. As a result, the manufacturing cost of the printed circuit board can be reduced.

The mounting area of the SAW filter 11 and the dielectric filter 12 can be made smaller than the space for arranging the components necessary for obtaining the same characteristics with the LCR filter. By configuring the 50 such that the SAW filter 11 and the dielectric filter 12 can be replaced, the size of the printed circuit board can be reduced.

The present invention is not limited to the above embodiment. For example, the plurality of types of filter elements may be three or four types, and are formed on a dielectric substrate. The circuit pattern may be wired by other plating instead of printing, or applied to not only a double-sided printed circuit board but also a four-layered or six-layered printed circuit board. It is also possible to change and implement as appropriate.

[0019]

As described above, according to the first aspect of the present invention, a circuit pattern is formed on a single printed circuit board so that a plurality of types of filter elements can be mounted, and one of the filter patterns is formed. The circuit pattern is provided with a notch that allows selective connection by soldering by selectively mounting elements.This saves time and effort in designing and manufacturing multiple circuit boards. The burden can be reduced.

According to the second aspect of the present invention, in addition to the effect of the first aspect, since a SAW filter element and a dielectric filter element can be mounted as filter elements, an LCR filter element having equivalent characteristics can be provided. Compared to placing,
The size of the printed circuit board can be reduced.

According to the invention of claim 3, claim 1 or 2
In addition to the effect described above, when the circuit pattern to be selected is formed as a branch, a cut is provided at the branch point, so that transmission loss can be prevented.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a printed circuit board according to the present invention,
(A) is an element surface on which the element is mounted, (b) is a side surface, (c)
Indicates the back side.

2A and 2B are mounting diagrams in which a SAW filter is arranged on the printed circuit board shown in FIG. 1, wherein FIG. 2A shows an element surface on which the element is mounted, FIG. 2B shows a side surface, and FIG.

3A and 3B are mounting diagrams in which a dielectric filter is arranged on the printed circuit board shown in FIG. 1, wherein FIG. 3A shows an element surface on which elements are mounted, FIG. 3B shows a side surface, and FIG.

FIG. 4 shows an external view and terminal arrangement of a SAW filter,
(A) is a plan view, (b) is a front view, (c) is a bottom view,
(D) is a terminal arrangement table.

FIG. 5 shows an outline view and terminal arrangement of a dielectric filter,
(A) is a plan view, (b) is a front view, (c) is a bottom view,
(D) is a terminal arrangement table.

[Explanation of symbols]

6, 7, 9, 10, 24a to 24h, 25a to 25h
・ Land, 8, 22a to 22d ・ ・ Through hole, 11
..SAW filters, 11a to 11d and 12a to 12h
Terminals, 12 Dielectric filters, 31 to 35 Circuit patterns, 41 to 44 Notches, 50 Printed boards, 51 Dielectric boards, 52, 53 GND patterns.

Claims (3)

[Claims] 1. A circuit board in which a plurality of types of filter elements having different terminal positions are formed on a dielectric substrate so that the circuit pattern can be replaced and mounted, wherein a notch that can be selectively connected by soldering is provided in the circuit pattern. A circuit board, wherein the circuit pattern is connectable by soldering in accordance with a mounted filter element of the plurality of types of filter elements. 2. The circuit board according to claim 1, wherein the plurality of types of filter elements are a SAW filter element and a dielectric filter element. 3. The circuit board according to claim 1, wherein when a circuit pattern to be selected is formed by branching, a cut is provided at the branch point.