JP2004071431A - Connector conversion adapter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrain deterioration of a high-speed digital signal transmitted in a connector conversion adapter of a CD-ROM device. <P>SOLUTION: The place of a positioning penetrating hole 15 of a printed board 11A is of a through-hole structure. A metal film 61 constituting a part of the through-hole structure is connected with three grounding patterns 20, 21, 22 separated in the conventional device, so that metal films 60, 61, 61 constituting the through-hole structure are to be included in the grounding patterns. With this, a grounding potential is reinforced, so that an extent of deterioration of the signal of the high-speed digital signal during transmission in the connector conversion adapter is restrained. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a connector conversion adapter, and more particularly, to a connector conversion adapter attached to the back of a CD-ROM drive.
[0002]
[Prior art]
As shown in FIG. 4, the CD-ROM drive 1 includes a flat case 2 and a CD-ROM drive main body 3 which can enter and exit the case 2, and has a connector 4 on the back. X1-X2 is the width direction, Y1-Y2 is the depth direction, and Z1-Z2 is the height direction. The CD-ROM drive main body 3 has a turntable 5 and an optical pickup 6. The CD-ROM drive 1 is usually used by being incorporated in a computer device. A cable connector at the end of a cable extending from a control board inside the computer device is connected to the connector 4 on the back of the CD-ROM drive.
[0003]
Some manufacturers of computer devices use different types of cable connectors than normal cable connectors. Therefore, in the CD-ROM drive manufacturer, as shown in FIG. 4, a connector for the CD-ROM drive 1 to which the delivery destination is the above-described manufacturer is provided on the rear surface so that a cable connector of a different type can be connected. It is shipped with the conversion adapter 10 screwed and attached.
[0004]
In recent years, the speed of digital signal transmission between a CD-ROM drive and a computer device has been increasing, and the connector conversion adapter 10 is also required to have a configuration in which high-speed digital signal hardly deteriorates. .
[0005]
FIG. 5 shows the conventional connector conversion adapter 10 in a disassembled state with the connector 30 facing forward.
[0006]
The connector conversion adapter 10 has a structure in which a reference connector 30 is mounted on one surface 11a of an elongated printed board 11, and a connector 40 of another type is mounted on an opposite side 11b. The size of the printed circuit board 11 must be substantially the same as the size of the back surface of the CD-ROM drive 1, and the size is limited.
[0007]
The reference connector 30 is configured to be connected to a standard connector 4 provided on a CD-ROM drive, is a surface mount type, and has n rows (here, n = 25) on one side arranged in two rows. It has a plurality of lead terminals 31, fixing leads 32, 33 projecting on both sides, and cylindrical positioning projections 34, 35 projecting to positions near both sides on the back surface. Even if the type of the connector conversion adapter changes, the reference connector 30 is the same.
[0008]
On one surface 11 a of the printed circuit board 11, a foot pattern 12, patterns 13 and 14, and through holes 15 and 16 are formed in relation to the connector 20. The through holes 15 and 16 are formed by drilling. The foot patterns 12 are arranged in two rows so as to correspond to the lead terminals 31, the patterns 13 and 14 correspond to the fixing leads 32 and 33, and the through holes 15 and 16 correspond to the positioning projections 34 and 35. It is arranged.
[0009]
The conversion connector 40 has a size larger than that of the connector 20 described above, and is of a size to which a cable connector at the tip of a cable extending from a control board inside a computer device in which a CD-ROM drive is incorporated is connected. The pin terminals 41 protrude from the bottom surface. When the type of the connector conversion adapter changes, the conversion connector 40 changes.
[0010]
The printed circuit board 3 has a through hole 17 through which the pin terminal 41 penetrates in relation to the connector 40. Further, the foot pattern 12 and the through hole 17 are in such a relationship that one foot pattern 12 and one through hole 17 correspond to each other, and one foot pattern 12 and one through hole 17 are connected to the ground on the printed circuit board 11. They are connected by a pattern, a power supply line pattern, or a signal line pattern.
[0011]
The connector 30 is positioned on the surface 11a of the printed circuit board 11 by fitting cylindrical positioning projections 34 and 35 into the through holes 15 and 16, and soldering the lead terminals 31 to the foot pattern 12 and fixing them. The leads 32, 33 are soldered to the patterns 13, 14, and are surface-mounted.
[0012]
The connector 40 has the pin terminals 41 fitted in the through holes 17 and soldered, and is mounted on the surface 11 b of the printed circuit board 11 opposite to the surface 11 a.
[0013]
FIG. 6 is an enlarged view of a portion indicated by a circle 100 in FIG. As shown in the figure, ground patterns 20, 21, 22, a power supply line pattern 23, and a signal line pattern 24 are formed. 25 is a pattern other than the ground pattern.
[0014]
The ground terminal of the connector 30 and the ground terminal of the connector 40 are electrically connected to the ground patterns 20, 21, 22. The power terminal of the connector 30 and the power terminal of the connector 40 are electrically connected by the power line pattern 23. The signal terminals of the connector 30 and the corresponding signal terminals of the connector 40 are electrically connected by the signal line pattern 24.
[0015]
These patterns 20 to 24 have a limited narrow area obtained by subtracting the area of the foot pattern 12, the patterns 13, 14, the through holes 17, and the through holes 15, 16 from the area of the printed board 11 having a limited size. It will be formed in the area part.
[0016]
[Problems to be solved by the invention]
Regarding the portion around the through hole 15, it is prohibited to form a pattern around the through hole 15 in consideration of the accuracy of drilling for forming the through hole 15 and the accuracy of etching for forming the pattern. A pattern formation prohibition area 50 is set. The gaps 51 and 52 between the pattern formation prohibited area 200 and the foot patterns 12-1 and 12- (n + 1) are narrow, and the patterns cannot pass through the gaps 51 and 52.
[0017]
For this reason, with respect to the ground pattern located near the through hole 15, the three ground patterns 20, 21, and 22 are separated at the location of the through hole 15. Therefore, it was difficult to increase the total area including the area of each of the ground patterns 20, 21, 22.
[0018]
If it is difficult to increase the total area including the areas of the ground patterns 20, 21 and 22, it is difficult to enhance the ground potential, and as a result, a high-speed digital signal is transmitted through the connector conversion adapter 10. There is a possibility that it is not sufficient to make deterioration less likely to occur during the operation.
[0019]
Then, an object of the present invention is to provide a connector conversion adapter which solved the above-mentioned subject.
[0020]
[Means for Solving the Problems]
According to the first aspect of the present invention, a reference connector is mounted on one side of a printed circuit board, a conversion connector is mounted on the opposite side, and corresponding terminals of the two connectors are electrically connected by a pattern. In the connector conversion adapter having a configuration in which a ground terminal of each connector is electrically connected to a ground pattern, the printed board has a positioning through-hole into which the positioning projection of the connector is fitted. A structure having a through-hole structure having a metal film on the inner peripheral surface and a portion around the opening of the through-hole, and wherein the metal film forming the through-hole structure is formed by being connected to the ground pattern. It was done.
[0021]
Since the metal film that forms the through-hole structure is connected to the ground pattern, the area of the ground pattern is wider than that of the conventional metal film, and the ground potential is strengthened by the increased area. Deterioration is suppressed.
[0022]
According to a second aspect of the present invention, a reference connector is mounted on one surface of a printed circuit board, a conversion connector is mounted on the opposite surface, and corresponding terminals of the two connectors are electrically connected by a pattern. In the configuration of the connector conversion adapter,
The printed circuit board has a structure in which a positioning through hole into which the positioning protrusion of the connector is fitted has a through hole structure having a metal film on an inner peripheral surface of the through hole and a portion around an opening of the through hole. Further, the metal film constituting the through-hole structure is formed so as to be connected to the pattern.
[0023]
When the ground pattern is configured to be connected to the metal film forming the through-hole structure, the area of the ground pattern is wider than that of the conventional metal film, and the ground potential is strengthened by the increased area, The signal degradation is accordingly reduced.
[0024]
When the power supply line pattern is connected to the metal film forming the through-hole structure, the power supply line pattern does not have a portion having a reduced width, and the current capacity of the power supply line pattern increases.
[0025]
In the case where the signal wiring pattern is connected to the metal film forming the through-hole structure, the signal wiring pattern does not have a portion having a reduced width, and the signal transmission characteristics are improved.
[0026]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is an exploded view of a connector conversion adapter 10A according to an embodiment of the present invention, and FIG. 2 is an enlarged view of a portion indicated by a circle 101 in FIG. In each drawing, the same reference numerals are given to the portions corresponding to the components shown in FIGS. 5 and 6, and the description thereof will be omitted.
[0027]
The connector conversion adapter 10A has the same configuration as the connector conversion adapter 10 shown in FIG. 4 except for a part of the printed circuit board 11A. The connector 30 is provided on one side 11Aa of the elongated printed circuit board 11A, and another type is provided on the opposite side 11Ab. This is a structure in which the connector 40 is mounted.
[0028]
The location of the positioning through-hole 15 of the printed board 11A has a through-hole structure as shown in FIGS. 2 and 3, and the metal film 60 covering the inner peripheral surface 15a of the through-hole 15 and the surface 11Aa of the printed board 11A A metal film 61 covers a portion around the opening 15b of the through hole 15, and a metal film 62 covers a portion around the opening 15c of the through hole 15 on the surface 11Ab of the printed circuit board 11A.
[0029]
The metal film 61 is connected to the three ground patterns 20, 21, and 22 conventionally separated. Therefore, the ground pattern 65 around the through hole 15 is formed by adding the metal films 61, 60, and 62 to the conventional three separated ground patterns 20, 21, 22, and in other words, the metal film 61, Since 60 and 62 are included in the ground pattern, the area of the ground pattern 65 is larger than that of the related art. Therefore, the ground potential is strengthened by the increase in the area, and the degree of deterioration of the high-speed digital signal during transmission through the connector conversion adapter 10A is suppressed accordingly.
[0030]
The position of another positioning through hole 16 also has a through hole structure like the above through hole 15, the area of the ground pattern is wider than before, the ground potential is strengthened, and high-speed digital signal Is suppressed during transmission through the connector conversion adapter 10A.
[0031]
Since the positioning projections 34 and 35 of the connector 30 are both insulating, there is no effect even if the positioning projections 34 and 35 are fitted into the through holes 15 and 16 of the through-hole structure.
[0032]
In addition, the metal film of the through hole structure of the through holes 15 and 16 may be configured to be connected to the power supply line pattern on the printed board 11A. In this configuration, the power line pattern does not have a portion where the width is reduced, and the current capacity of the power line pattern increases.
[0033]
In some cases, the metal film of the through-hole structure of the through holes 15 and 16 may be configured to be connected to the signal wiring pattern on the printed board 11A. In this configuration, there is no longer any portion of the signal wiring pattern where the width is reduced, and the transmission characteristics of high-speed digital signals are improved.
[0034]
【The invention's effect】
As described above, according to the present invention, the positioning through-hole into which the positioning projection of the connector is fitted has a structure having a through-hole structure, and the metal film forming the through-hole structure is connected to the ground pattern. Because of this configuration, the area of the ground pattern is larger than that of the conventional metal film by the area of the metal film, the ground area is strengthened by the increased area, and the signal deterioration can be suppressed by that much. A connector conversion adapter in which signal deterioration is suppressed can be realized.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a connector conversion adapter according to an embodiment of the present invention.
FIG. 2 is an enlarged view showing a pattern of a portion surrounded by a circle 101 in FIG. 1;
FIG. 3 is a sectional view taken along line III-III in FIG.
FIG. 4 is a diagram showing a CD-ROM drive to which a connector conversion adapter is attached.
FIG. 5 is an exploded perspective view showing the conventional connector conversion adapter in FIG.
FIG. 6 is an enlarged view showing a pattern of a portion surrounded by a circle 100 in FIG. 5;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 CD-ROM drive 2 Case 3 CD-ROM drive main body 10A Connector conversion adapter 11A Slender printed board 12 Foot pattern 13, 14 Pattern 15, 16 Through hole 23 Power supply line pattern 24 Signal line pattern 30 Reference connector 40 Conversion connector 60 , 61, 62 Metal film 65 Ground pattern

Claims (2)

A reference connector is mounted on one side of the printed circuit board, a conversion connector is mounted on the opposite side, the corresponding terminals of the two connectors are electrically connected by a pattern, and the ground of each connector is provided. In a connector conversion adapter in which terminals are electrically connected to a ground pattern,
The printed circuit board has a structure in which a positioning through hole into which the positioning protrusion of the connector is fitted has a through hole structure having a metal film on an inner peripheral surface of the through hole and a portion around an opening of the through hole. And a metal film forming a through hole structure is formed so as to be connected to the ground pattern. In a connector conversion adapter having a configuration in which a reference connector is mounted on one surface of a printed circuit board, a conversion connector is mounted on the opposite surface, and corresponding terminals of the two connectors are electrically connected by a pattern,
The printed circuit board has a structure in which a positioning through hole into which the positioning protrusion of the connector is fitted has a through hole structure having a metal film on an inner peripheral surface of the through hole and a portion around an opening of the through hole. A connector conversion adapter, wherein a metal film constituting a through-hole structure is formed so as to be connected to the pattern.

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