JPS6314350Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a switch that is most suitable for application to, for example, small electronic devices, and particularly relates to a switch that can directly switch circuits on a printed circuit board.

As a method for switching circuits on a printed circuit board, basically, it is possible to replace the jumper wires connecting the wiring patterns or install a switch. However, with the method of replacing jumper wires, it is necessary to perform troublesome work such as re-soldering, and if re-soldering is repeated many times, the wiring pattern will be damaged by heat, resulting in reliability problems. A problem arises. Furthermore, the method of mounting the switch has a very poor space factor on the printed circuit board, which is not preferable, especially for electronic devices aimed at miniaturization.

The present invention was devised in view of the above-mentioned circumstances, and aims to provide a switch that is easy to switch and has a good space factor by utilizing the end face of a printed circuit board. The present invention is intended to provide a device that is effective for a band changeover switch corresponding to the destination in a small radio receiver, a time changeover switch corresponding to the destination in a watch, and the like.

The present invention will be explained below with reference to examples. This embodiment relates to a wristwatch-type radio receiver, and as shown in FIG. 1, it is constructed in the shape of a wristwatch. That is, this radio receiver is comprised of a main body case 1 and a bendable wrapping body 2 for holding the main body case 1 by wrapping it around the arm. Main case 1 is speaker 3
and a digital display section 4.

The left part of the winding body 2 consists of four winding body units 5, 6, 7, 8, the unit 5 being constructed as a control box. The next unit 6 houses a watch battery. Further, the next unit 7 houses auxiliary circuit components. The last unit 8 is more elongated than the other units, and houses a watch battery. Further, a locked portion is formed at the tip of this unit 8.

The right side portion of the winding body 2 is composed of four winding body units 9, 10, 11, and 12, and a bar antenna is housed in the unit 9. The next two units 10 and 11 contain nothing and function only as part of the wrapped body. Further, a locking pawl 13 is connected to the tip of the last unit 12, and is configured to engage with the locked portion of the unit 8. In addition, unit 5 configured as a control box has
All the operation buttons necessary for the radio receiver and the clock are centrally mounted on this unit 5. This operation button group includes, for example, time adjustment button 1.
3. Button 14 for switching modes between real time and timer (alarm), Up-down tuning button 1
5. Memory channel button 16, auto/manual switching button 17, volume button 18, radio ON
- It is composed of an OFF button 19 and the like. This wristwatch-type radio receiver functions as both a wristwatch and a radio receiver, and the digital display section is configured to selectively digitally display the time and the tuned frequency of the radio receiver. ing.

Next, with reference to FIGS. 2 to 4, a switch 20 of the present invention constructed using the end surface of a printed circuit board 21 incorporated in the unit 5 will be explained. Note that the above-mentioned operation buttons 13 to 19 are provided on this printed circuit board 21.
A circuit is provided which is switched by.

First of all, this shows a three-contact changeover switch, and the end face 23, which is the side end face of the printed circuit board 21, has three approximately semicircular shapes spaced apart from each other at regular intervals in the length direction. Recesses 24, 25, 26
is formed. And these recesses 24, 2
Contacts 27, 28, 29 plated with metal such as copper or gold are formed on the inner circumferential surfaces of 5, 26, and these contacts 27, 28, 29 are provided on, for example, the top surface of the printed circuit board 21. Wiring pattern 30, 3
1 and 32, respectively. On the other hand, the contact piece 34 made of a conductive and elastic thin plate such as a phosphor bronze plate has the three contacts 27, 28, 29
Of these, two convex contact portions, ie, contacts 35 and 36, which are selectively press-fitted to two of them, 27 and 28 or 28 and 29, are integrally provided. Note that these contacts 35 and 36 are the same as the above contacts 27, 28, and 29.
The contact piece 34 has a substantially semicircular arc shape that matches the shape of the contact piece 34 . Further, a small projecting piece 37 is bent at a substantially right angle and is integrally provided on this contact piece 34. Note that the printed circuit board 1 is assembled in the case 39 of the unit 5, and
The back side of 9 is configured to be closed with a back cover 41 which is detachably fixed with a plurality of screws 40. The case 39 and the back cover 41 are made of an insulating material such as plastic, and their surfaces 39a and 41a are coated with metal plating, thin metal plates, or the like.

By the way, the end surface 23 of the printed circuit board 21 incorporated in the case 39 is opposed to the case 39 which serves as the opposing member, and the inner wall surface of the case 39 has
A notch 42 is formed between the end surface 23 and the case 39 to form a gap. The contact piece 34 is inserted into the notch 42 at right angles to the printed circuit board 21 against its elasticity, and is elastically held within the notch 42, and the two contacts 35,
36 selectively contacts two of the three contacts 27, 28, 29 or 28 and 29 in a direction ( It is configured to be elastically crimped from the left direction in Fig. 4). At this time, the small protruding piece 37 of the contact piece 34 is inserted into a shallow notch 43 provided in the case 39.

In the switch 22 configured as described above,
The center contact 28 is configured as a common contact, and the contacts 27 and 29 on both sides are configured as switching contacts. When the contact piece 34 is inserted into the position shown by the solid line in FIG. 3, the contacts 27 and 28 are connected, and when the contact piece 34 is inserted into the position shown by the imaginary line in FIG. By replacing the contact piece 34, the circuit formed by the wiring patterns 30, 31, and 32 on the printed circuit board 21 can be directly switched. To replace the contact piece 34, simply remove the back cover 41, pinch the small protrusion piece 37 with tweezers, pull out the contact piece 34, shift the position, and insert it again. It's easy to do.

The switch 22 is used, for example, as a preset switch such as a band changeover switch corresponding to the destination in a radio receiver or a time changeover switch corresponding to the destination in a watch.

There are many possible applications for this switch 22.
By configuring the end face 23 of the printed circuit board 21 to have four or more contacts, a multi-contact changeover switch can be constructed.
Furthermore, the contacts 27, 28, and 29 do not necessarily have to be concave portions, but may be convex portions opposite to the concave portions.
The contacts 35 and 36 on the contact piece 34 side may be formed in a concave shape.

Next, an example of a method for forming the three contacts 27, 28, 29 of the printed circuit board 21 will be explained with reference to FIGS. 5 to 8.

First, as shown in FIGS. 5 and 6, three through holes 45, 46, and 47 are formed in the printed circuit board 21, and metal plating 48, 49, and
0 is applied to form so-called through holes connected to the three wiring patterns 30, 31, and 32 of the printed circuit board 21, respectively.

Next, as shown in FIGS. 7 and 8, if the printed circuit board 21 is cut along the cutting surface 51 along the center line of the three through holes 45, 46, and 47, the nearly semicircular shape as described above is obtained. Three contacts 27, 28,
29 will be formed, and the method for forming it is very simple.

Note that the contacts 27, 28, and 29 do not necessarily need to be made of metal plating 48, 49, and 50 as described above; It can be formed by various methods, such as fixing it to 23 by caulking it from both upper and lower sides, or bonding it with an adhesive.

Although the embodiments of the present invention have been described above, the present invention is not limited to the wristwatch-type radio receiver shown in the embodiments, but can be effectively applied to various other small electronic devices. .

As mentioned above, the present invention provides a plurality of wiring patterns on at least one of the upper and lower surfaces of the printed circuit board,
A plurality of contacts respectively connected to the plurality of wiring patterns are provided on the side end surface of the printed circuit board, and the plurality of contacts are provided at intervals in the length direction of the side end surface, and are opposite to the side end surface. A gap is provided between the opposing member, a contact piece having conductivity and elasticity is provided with a plurality of contact portions that selectively contact the plurality of contacts, and the contact piece is moved into the gap against the elasticity of the contact piece. the contact piece is elastically held within the gap, and the plurality of contact portions of the contact piece are elastically crimped to the plurality of contacts from a direction perpendicular to the thickness direction of the printed circuit board. let me,
The plurality of contacts are switched by replacing the contact piece with respect to this gap.

Therefore, according to the present invention, although it is possible to directly switch the circuit on the printed circuit board, the switching is very easy and highly reliable.
Furthermore, a product with a very good space factor for ultra-miniaturization and thinning can be obtained.

In addition, by simply inserting the contact piece into the gap between the side end surface of the printed circuit board and the opposing member against its elasticity, the contact piece is held elastically within the gap, and multiple contacts of the contact piece can be made. Since the part is configured to be elastically crimped to a plurality of contacts, the contact piece can be easily fixed to the contacts without using a fixing member, etc., and the contact part can be securely attached to the contacts. can be brought into contact with.

Furthermore, since the structure is configured so that the contact piece can be replaced using the gap provided between the side end surface of the printed circuit board and the opposing member, for example, a mounting hole can be drilled between each wiring pattern of the printed circuit board. However, compared to the case where the contact piece is replaced with respect to this mounting hole, no strain is placed on the printed circuit board during replacement, and the strength of the printed circuit board is not reduced.

Furthermore, a contact point is provided on the side end surface of the printed circuit board, and the contact portion is crimped to the contact point from a direction perpendicular to the thickness direction of the printed circuit board, so that the wiring provided on the printed circuit board Compared to the case where the contact portion is crimped onto the pattern from the thickness direction of the printed circuit board, no strain is applied to the printed circuit board during crimping.

[Brief explanation of the drawing]

The drawings show an embodiment in which the present invention is applied to a wristwatch-type radio receiver, in which Fig. 1 is an overall perspective view, Fig. 2 is a perspective view of a switch portion, and Fig. 3 is a perspective view of the switch portion. FIG. 4 is a plan view, FIG. 4 is a sectional view taken along the line of FIG. 3, and FIGS.
The figure is a plan view, FIG. 6 is a cross-sectional view taken along the line of FIG. 5, and FIG. 8 is a view taken along the line of FIG. Also, in the symbols used in the drawings, 21...
Printed circuit board, 22... switch, 23... end face of printed circuit board, 24, 25, 26... recess, 2
7, 28, 29... Contact, 30, 31, 32...
Wiring pattern, 34... Contact piece, 35, 36...
Contact, 39...Case, 42...Notch.

Claims (1)

[Scope of utility model registration request] A plurality of wiring patterns are provided on at least one of the upper and lower surfaces of the printed circuit board, and a plurality of contacts connected to each of the plurality of wiring patterns are provided on the side end surface of the printed circuit board, and the plurality of contacts has a length of the side end surface. A plurality of contact portions are provided at intervals in the direction, a gap is provided between the side end face and a facing member facing the side end face, and the contact piece has conductivity and elasticity and is selectively brought into contact with the plurality of contacts. established,
The contact piece is inserted into the gap against its elasticity to elastically hold the contact piece in the gap, and the plurality of contact portions of the contact piece are connected to the plurality of contacts on the board of the printed circuit board. A switch configured to be elastically crimped from a direction perpendicular to the thickness direction and to switch the plurality of contacts by replacing the contact piece in this gap.