JPH0214594A - Three-dimensional integrally-formed printed wiring board - Google Patents

Abstract

PURPOSE:To make a three-dimentional integrally-formed printed wiring board at a low cost by forming an energizing member which brings other printed wiring boards or electric circuit components to be welded to a conductive pattern by pressure and a holding member to hold them near connections in a body. CONSTITUTION:An external display device of a small-sized electronic precision mechanical equipment consists of a connection 7 forming connecting parts and contact parts, an energizing member 8, a switch member 10 and a holding member 11, all of which are installed in a body in an LCD case 1 made of thermal plastic resin such as polysulfone. After an LCD driver 3 is soldered to a land pattern 4b by a vapor phase reflow method, it is installed against a locating wall 14, being inserted into a flexible printed board 24. Then, this is mounted on a case 25 with vises 15 and is covered with an outer packaging cover, to complete the external display device. By this method, connector-related components can be cut back by a large number and the structure is simplified, resulting in a substantial cost reduction as well as reduction of assembly manhours.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a molded printed wiring board in which a conductive pattern is provided on a three-dimensional structure.

[Conventional technology] In order to provide high precision and a wide variety of functions in recent small electronic devices, electronic circuit components are mounted in high density on printed wiring boards, and the scale of the electric circuits is relatively large. They tend to become more complex and complex. Along with this, electrical connections such as connecting various external operation switches, connecting with electro-optical elements such as LCDs and LEDs, and connecting printed wiring boards with each other, centering on printed wiring boards equipped with ICs, etc. The number of so-called connectors that perform this function is increasing.

As an example of such a conventional technique, FIG. 4 shows and describes the structure of an external display mechanism that is often used in small electronic 1'fI sensitive devices such as cameras.

In the figure 's4, 51 is an external display LCD for monitoring the operation status of the device, 51a is a transparent electrode for external contact, and 52 is the L (: L for fixing D51).
The CD case 53 is an IC for controlling the drive of the Lfl:051 and detecting the state of the external operation switch.The LCD driver 54 is a glass epoxy material on which the LCD driver 53 is mounted and a conductive pattern 55 such as copper foil is wired. A printed wiring board made of paper phenol material, 56 is conductive rubber for electrically connecting the LCD 51 and the contact portion 55a of the conductive pattern 55 on the printed wiring board 54;
Reference numeral 57 designates an elastic pressing member so as to press the LCD 51, and reference numeral 58 designates a switch contact piece arranged so as to be electrically connected to the conductive pattern 55b when an operation button 59 operated from the outside is pressed down. Further, a part 58a of this switch contact piece 58 is formed into a tongue-like contact piece, and is adapted to be in contact with a conductive pattern 55c which is at the GND level. Since the conductive pattern 55b is connected to the manual power bottle of the CD driver 53, the operation button 5
By pressing 9, the conductive pattern 55b is brought into conduction with the conductive pattern 55c and becomes the GND level, and the LCD driver 53 can detect that this switch has been pressed. 55d is a through-hole portion connecting the front and back sides of the printed wiring board 54, and 55e is a conductive pattern of a contact portion for establishing conduction with the conductive pattern 61 of the flexible printed board 60 to be connected. is connected to the input/output bin.

Reference numeral 62 is silicone rubber, and reference numeral 63 is a connector base plate. After the printed wiring board 54 and flexible printed board 60 are combined, each is screwed to the LCD case 52 with screws 64, thereby forming the conductive pattern 55e and the conductive pattern 6.
This is to connect with 1. Reference numeral 65 denotes an insulated metal base plate, which is fixed with a printed wiring board 54 sandwiched between it and the LCD case 52 to complete the external display mechanism. Reference numeral 66 denotes an exterior cover 67 which is an acrylic display window for viewing the LCD 51.

By the way, in recent years, there has been a full additive method of patterning relatively heat-resistant thermoplastic resins such as polysulfone, polyethersulfone, and polyetherimide by electroless plating, and release paper coated with conductive ink has been developed. Techniques have been established for forming conductive patterns on three-dimensional structures, such as by a transfer method in which conductive patterns are formed by inverting them and pasting them together to form a pattern. For example, it was published in the February 1986 issue of Denki Eikou.

[Problems to be Solved by the Invention] In the conventional technology described above, conductive rubber, contact pieces,
Some connectors have a large number of parts, such as connector-related parts such as the connector base plate that holds the printed wiring board, and the casing that fixes electro-optical elements such as liquid crystals and LEDs, and the structure is complex, increasing the number of assembly steps. However, there are problems in that the cost is high and the size is also large.

The present invention aims to solve the above problems. That is, an object of the present invention is to provide a three-dimensionally molded printed wiring board that can be obtained at low cost and avoids increasing its size.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a three-dimensionally molded printed wiring board in which a conductive pattern is formed into a three-dimensional structure. A connecting portion is provided, and a biasing member or a holding member for pressing or holding another printed wiring board or electric circuit component with the conductive pattern is integrally molded near the connecting portion.

[Function] According to the present invention, there is provided a connection portion in which a conductive pattern for electrical connection is provided, and other electrical connection members or electric circuit components are pressure-connected or connected to the conductive pattern in the vicinity of this connection portion. Since it is a three-dimensionally molded printed wiring board with the biasing member or holding member integrally molded, the number of parts related to the connector is greatly reduced, the structure is simplified, and the cost is significantly reduced due to the reduction in assembly man-hours. In addition to being able to measure down, the thickness of the structure can be reduced, making it possible to downsize.

[Embodiment] FIGS. 1 and 2 show a first embodiment of the present invention. This embodiment is an example in which the present invention is applied to an external display mechanism of a small electronic precision instrument.

In FIGS. 1 and 2, reference numeral 1 denotes an LCD case made of a three-dimensionally molded printed wiring board, which has a structure to be described later.

2 is an LCD, 2a is a transparent electrode for external connection of the LCD 2, 3 is an LCD driver, 4 is a conductive pattern on the front surface, and 5 is a conductive pattern on the back surface.

6 is a through hole for connecting the pattern 4.5, and the conductive pattern 4 is wired so as to be electrically connected to the human power pin 3b of the LCD driver 3 that receives an input signal from an external input or an MPU (not shown). There is. LCD
A part of the conductive pattern 5 on the back surface of the case 1 is shown in FIG. 2 by a broken line. Then, a part is again electrically connected to the front surface side of the LCD case 1 through the through hole 6, forming a switch conductive pattern 4c and a GND conductive pattern 4d.

Reference numeral 7 denotes a connection portion in which a connection conductive pattern 4a formed to face the transparent electrode 2a is disposed. Reference numeral 8 denotes a biasing member that is provided near the conductive pattern 4a and biases the LCD 2 so as to come into pressure contact with the connecting portion 7;
The CD 2 is energized to establish electrical continuity between the transparent electrode 2a and the conductive pattern 4a. Reference numeral 9 denotes an opening provided so that the biasing member 8 can be released from the mold during the molding process.

Reference numeral 4b denotes a land pattern formed in a land shape for soldering the LCD driver 3, and each second land pattern is connected to the conductive pattern 4a so that the output pin 3a of the LCD driver 3, which generates an output signal for driving the LCD, is electrically connected to the conductive pattern 4a. As shown in the figure, conductive patterns 4 are wired.

Reference numeral 10 denotes a switch member formed in the shape of a contact piece and provided with elasticity, and its negative side is covered with a conductive pattern 4e as shown in FIG.
is formed.

21 is an operation button, 22 is an exterior cover, and 23 is a display window, which have the same structure as the conventional example.

That is, by pressing down the operation button 21, the conductive pattern 4c for the switch and the conductive pattern 1 for GND 4d are made conductive by the conductive pattern 4e, and the through hole 6 - the conductive pattern 5 on the back side - the through hole 6 - the conductive pattern on the front side. 4→Land pattern 4b-hL (:D
It is connected to the human power pin 3b of the driver 3, and can detect that the switch of the LCD driver 3 is turned on.

11 is a holding member whose arm shape is shorter than the biasing member 8 (more or less rigid), and the conductive pattern 5 on the back side
A connecting conductive pattern 5a is formed which is connected to the connecting conductive pattern 5a.

24 is a flexible printed board on which a main circuit including CI'υ of a small electronic device (not shown) is mounted.

Reference numeral 12 denotes an opening for releasing the holding member 11, and a receiver provided with the flexible printed board 24 in the LCD case 1 allows the flexible printed board 24 to be opened when inserted into the gap between the surface 13 and the holding member 11. As shown in the figure, it plays the role of bending, improves the connection between the connecting conductive pattern 5a and the connecting conductive pattern on the flexible printed board 24, and is also used to prevent the flexible printed board from being pulled out.

The connecting part 7, the biasing member 8, the switch member 10, and the holding member 1, which are the members forming the connector part and the contact part described above.
1 is made integrally with the LCD case 1 made of a thermoplastic resin such as the aforementioned polysulfone. Thereafter, electroless copper plating is performed using the flare additive method to form a conductive pattern in the form described above.

First, in the LCD case 1 made in this way,
D. Solder the driver 3 to the land pattern 4b using the vapor phase reflow one-way method, then attach the LCD driver 3 against the positioning peripheral wall 14 from the arrow ■ direction in Figure 2, and flexibly print from the arrow ■ direction. By inserting the plate 24, an external display mechanism equivalent to that shown in the conventional example is completed.

By attaching this to the casing 25 of this small electronic precision instrument with screws 15 and covering it with an exterior cover, the external display section is completed.

Here, when comparing the parts with the conventional example shown in Fig. 4,
With the structure based on the present invention, a total of 6 types of 7 parts, including the conductive rubber 56, the holding member 57, the switch contact piece 58, the silicone rubber 62, the connector base plate 63, and the metal base plate 65, are all three-dimensionally molded and printed. This can be replaced with the LCD case 1 made of a wiring board.

FIG. 3 shows a second embodiment of the present invention, in which a hard printed board 33 such as a glass epoxy board is used for connecting the flexible printed board 24 to the LCD case 1 instead of the holding part of the flexible printed board 24 shown in FIG. This shows the configuration.

In FIG. 3, 31 is a connecting portion extending from the LCD case 1, 31a is a connecting pattern disposed on the contact portion 31b and connected to the conductive pattern 5 on the back side;
32 is a holding member protruding from the connecting portion 31 in a hook shape for holding the heart printed board 33, and 34 is an opening.

That is, the hard printed board 33 is inserted from the direction of the arrow (■), the conductive pattern 33a on the hard printed board 33 and the connecting conductive pattern 31a are connected, and the holding member 3
2 prevents the hard printed board 33 from being removed.

[Effects of the Invention] As explained above, according to the present invention, a connection portion having a conductive pattern for electrical connection is provided, and
This is a three-dimensionally molded printed wiring board that is integrally molded with a biasing member or a holding member that presses or holds other electrical connection members or electrical circuit parts with the conductive pattern near the connection part, so some related parts of the connector The structure has been significantly reduced, the structure has been simplified, and together with the reduction in assembly man-hours, the cost has been significantly reduced, and the thickness of the structure has been reduced, contributing to miniaturization. play.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a first embodiment of the present invention, FIG. 2 is a front view of FIG. 1, FIG. 3 is a sectional view showing a second embodiment of the present invention, and FIG. 4 is a conventional FIG. 2 is a cross-sectional view showing an example of this technique. 1...LCD case, 2...LCD. 3...LCD driver 4...Conductive pattern on the front surface, 5...Conductive pattern on the back surface, 6...Through hole, 7...Connection part, 8...
Attached M member, 10... Switch member,... Holding member. Kota Tani low ″′ 1, -8-4

Claims (1)

[Scope of Claims] 1. A three-dimensionally molded printed wiring board comprising a conductive pattern as a three-dimensional structure, comprising a connecting portion provided with a conductive pattern for electrical connection, and having a conductive pattern in the vicinity of the connecting portion. A three-dimensionally molded printed wiring board, characterized in that a biasing member for bringing another printed wiring board and electric circuit components into pressure contact with the conductive pattern is integrally molded. 2. A three-dimensionally molded printed wiring board comprising a conductive pattern as a three-dimensional structure, which is provided with a connecting part provided with a conductive pattern for electrical connection, and which is connected to another printed wiring board in the vicinity of the connecting part. and a three-dimensionally molded printed wiring board, characterized in that a holding member for holding an electric circuit component to the conductive pattern is integrally molded.