JPH02146799A - Miniature electrical machinery - Google Patents

Abstract

PURPOSE:To secure a wiring board in a body case without requiring a special fixing metal by stretching a portion of a conductive chip to the outside of the wiring board and forming a projecting chip. CONSTITUTION:A plurality of conductive chips 73 patterned on the basis of a wiring diagram are pressed while being coupled one another. Then the conductive chips 73 are mounted in a die and ABS resin mixed with glass fiber is ejected, thus forming a substrate 51. Then the substrate 1 is pressed along the dashed line. The conductive chip 73 is detoured around the substrate and the cutting section is separated from the substrate 51 at the portion shown by 74, then the conductive chips 73 are coupled one another while detouring the portion 76 and cutting is made along the dashed line. By such arrangement, chips K1, K2, K3 are partially projected from the wiring board 51 and the press edge is hooked to the inner wall face when the wiring board 51 is contained in the body case 1, thus realizing resilient positioning.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to electric shavers, flashlights, and other small electric appliances, and particularly relates to an improvement in the mounting structure of a wiring board housed in a main body case.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

In Fig. 1, reference numeral 1 denotes a main body case made of electrically insulating synthetic resin, which is composed of two parts, a front case 2 and a back case 3, which are butted together at the side surfaces, forming a flat box shape as a whole. At the bottom, a boat-shaped bottom case 4 made of synthetic resin such as ABS is held between the front and back cases 2 and 3. An outer blade holder 5 is detachably attached to the upper part of the main body case 1, and this outer blade holder 5 is made of nickel-cobalt electroformed or pressed stainless steel Fi.
The outer cutter 6 made of lfl board is stretched in an arch shape. Reference numeral 7 denotes a sharp edge block that protrudes rotatably with respect to the main body case 1, 8 a switch button for operating the sharp edge block 7 to protrude when opening and closing the power supply, and 9 a switch button 9 to prevent the switch button 8 from moving inadvertently. This is a lock button that prevents Further, numeral 10 is a light emitting diode for displaying power on to indicate that charging is in progress. The main body constructed in this way has been becoming thinner in recent years.
Moreover, the abutting surfaces of the two halves of the case form a flat box shape located on the side surfaces, and it is necessary to absorb the force applied to the front and back surfaces, improve the mechanical strength of the abutting surfaces, and eliminate the squeak of the case. ing.

Therefore, in the above embodiment, shock-absorbing elastic plates 11a and llb are provided on both side surfaces of the main body case 1, that is, on the abutting surfaces of the front and back cases 2.3, and on both side surfaces of the outer blade holder 5.
, 12a, 12b are attached. This elastic plate 11a
,llb.

12a and 12b are made of high-pressure polyethylene and preferably have a Shore hardness of about 70 to 80, but since the hardness is somewhat high, they are thin (thickness: 0.6 mm to 1.8 mm).
By forming it in a large arch shape, the inner surface is recessed and exhibits surface elasticity rather than local elasticity. It is also possible to form it from a silicone rubber plate.

Next, the driving portion housed in the main body case 1 will be explained with reference to FIG.

A lock button 9 and a switch button 8 that partially covers the lock button 9 are attached to the outer surface of the front case 2 so as to be able to slide freely on the outer surface. 8a and 8b are shown in the guide holes 13a and 13 of the front case 2.
Penetrating from b, polyacetal resin switch moderation plate 1
4 into the mounting holes 14a and 14b respectively, and the protruding tips are heat welded, whereby the front case 2 is sandwiched between the switch button 8 and the switch moderation plate 14. At this time, as shown in Fig. 3, lock button 9 made of polyacetal resin is
is housed between the switch button 8 and the front case 2 so that a part of it protrudes from the window '8C of the switch button 8,
The lock button 9 has resilient push-up tongue pieces 9a, 9 provided at both longitudinal ends thereof and extending outwardly with a slight downward slope.
b, by pressing the protruding portion as shown in FIG.

9b is deformed to slightly expand and descends with elasticity. The tongue pieces 9a, 9b may extend inward. There are two pins 9c in the center of the lock button 9,
9d protrudes from the long holes 15a and 15 of the front case 2.
One of the pins 9c, which are inserted into the respective slots b and pass through the elongated holes 15a, is in contact with an arm portion (indicated by ■ in FIG. 3) of a locking piece 14c integrally formed on the side edge of the switch moderation plate 14. , and will move up and down in accordance with the up and down movement of the lock button 9. A triangular hooking protrusion 16 is provided on the inner side edge of the elongated hole 15a.
is formed, and the bulging part of the lock piece 14c engages with the projection 16 when the switch button 8 is normally closed, and when pressed by the pin 9C, the bulging part descends and the projection 1
It will be deviated from 6, and the mouth/tsuku state will be canceled. The other pin 9d inserted into the elongated hole 15b serves as a sliding guide for the lock button 9 and restricts its sliding along the elongated hole 15b.

This lock button 9 needs to be easy to operate regardless of the user's dominant hand. For example, as shown in FIG. 5, even when a finger H is placed on only one side of the lock button 9, the lock button 9 itself is long and soft, and there are push-up tongues 9a at both longitudinal ends. 9b is provided, whereas the pin 9c presses the lock piece 14c that creates the locked state.
is located in the center of the lock button 9, so if only the left end side is pressed, the left end side tongue piece 9a expands and is elastically deformed, and the left half of the lock button 9 is also significantly elastically deformed, and the right half, especially the right end. Regardless of the elastic deformation of the side tongue piece 9b, the pin 9c descends and the lock piece 14c is pressed to release the locked state. Conversely, if a right-handed user presses the right side, the opposite effect will occur and the locked state will be released.

The optimum position for protruding pin 9C for this purpose is lock button 9.
A position midway between the overall length of is preferred.

Therefore, no matter where the lock button 9 is pressed with a finger, the lock piece 14c is pressed down by the pin 9C, and the bulge at the tip is disengaged from the vertical surface of the triangular hook protrusion 16 of the elongated hole 15a, resulting in the locked state. is released, and then press switch button 8.
, the switch moderation plate 14 will slide. Elastic arms 14d and 14e are integrally formed at the lower end of the switch moderation plate 14, and engage the moderation pin 17 on the inner surface of the front case 2 in three stages to generate elastic force. In addition, a round hole 14f is provided in the center of the switch moderation plate 14 that slides in this manner, which will be described later (indicated by a broken line in FIG. 1).
The operation pin 18a of the switch portion 18 is fitted, and the switch portion 18 is slidably operated. Along with this, a hook-shaped portion 14g is integrally formed on the upper side of the switch moderation plate 14. This hook-shaped portion 14g has two stages of the switch moderation plate 14 whose upward sliding state is positioned in three stages.
In other words, when the power switch section 18 is turned on for the first time, it engages with the notch 19a at the right end of the seesaw plate 19, and rotates the edge block 7 in three stages, with the switch section 18 remaining in the ON state. Cut out the above notch 1 so that it protrudes.
This is for pushing up 9a.

In other words, the seesaw plate 19 is connected to the rotating pin 2 on the inner surface of the back case 2.
0 is fitted with a rotation hole 19b, and can be rotated around this pin 20. A pin 19b is provided at the left end, and this pin 19b penetrates into the horizontal slide hole 21a of the rotation operation lever 21. At the same time, when the seesaw plate 19 is fitted onto the rotating pin 20, the tip of the rotating pin 20 further protrudes from the seesaw plate 19. 21b.

Therefore, if the seesaw plate 19 rotates counterclockwise,
The pin 19b slides within the horizontal slide hole 21a of the rotary operating lever unit 21 and acts to push down the lever unit 21, while the lever unit 21 is
a vertical slide groove 2 engaged with the pivot pin 20;
Since the rotation is restricted by 1b, the rotation operation lever unit 21 ends up sliding downward.

An inverted-shaped elastic lever 2 is attached to the upper part of the rotation operation lever integrated 21.
1c is integrally formed, and its tip engages with a right-angled notch 7b provided slightly rearward of the pivot pin 7a of the sharp blade block 7, and the pivot pin 7a is connected to the front case 2.
It engages with rotation recesses 23 provided on both sides of the protruding window 22 of the scraper blade block 7.

Therefore, when the rotation operating lever unit 21 slides downward, the elastic lever 21c engaged with the right-angled notch 7b acts to press the notch 7b downward, but the edge-to-edge blade block 7 rotates. Since the blade block 7 is rotatably supported by the movable pin 7a, the blade block 7 rotates and closes the protruding window 2.
2, it will protrude at a right angle. At this time, while the elastic lever 21c moves downward, the notch 7b rotates, so the elastic lever 21 is elastically deformed inward in a slightly arched shape, and then, after the blade block 7 protrudes, it returns to its original position. At this time, a click feeling is generated, and the protruding state can be maintained.

Reference numeral 24 denotes a motor, and an eccentric stand 27 equipped with an eccentric pin 26 is attached to the rotating shaft 25, and is projected upward from the through hole 29 of the drive stand 28. In this state, screws 30 and 31 are inserted into the motor 2.
Screw into the threaded holes 32° and 33 in No. 4 and secure.

Reference numeral 34 denotes a drive conversion body made of polysecure resin, and four deformed S-shaped thin elastic legs 35 are integrally provided at the side ends in the reciprocating direction, and each leg 35 has two legs on each side connected by a mounting base 36. A four-wood round pin 37 is protruded from the lower surface of the mounting base 36, and is inserted into the mounting hole 38 of the drive base 28, and the drive converter 34 and the drive base 28 are temporarily fixed. In the attached state, the eccentric pin 26 is fitted into an elongated hole 39 (indicated by a broken line) on the back surface of the drive converter 34. Further, a drive rod 40 is integrally formed on the upper surface of the drive conversion body 34, and a hair catch plate 41, an inner blade push-up spring 42, and an inner blade mount 43 are sequentially attached to the drive rod 40, and a mounting bracket 44 is attached to the drive rod 40. Extraction has been stopped.

Reference numeral 45 denotes a semicircular arc-shaped inner cutter body that is detachably attached to the inner cutter mounting base 43. The drive base 28 and the drive converter 34 are temporarily connected to each other by the sum (T3) of the wall thickness of the drive base 28 (T1) and the wall thickness (T2) of the mounting base 36 of the drive converter 34.
A concave groove 46 is formed on the inner wall of the front case 2, and the device is slid into the concave groove 46 to be positioned. For the press-fitting and locking force required at this time, it is appropriate for the material of the drive converter 34 to be made of a soft or elastic synthetic resin such as nylon or polyacetylene resin.

In this state, the protruding window 22 of the sharpening blade block 7 is closed by a shielding plate 47 formed on the front surface of the drive base 28 to prevent hair from entering. Further, elastic arms 48 extending from both ends of the drive base 28 are exposed through openings 49 opened at the mating surfaces of the front and back cases 2.3.
As shown in the figure, the tip projection 48a is engaged with a hooking recess 50 on the inner surface of the outer cutter holder 5.

Therefore, in order to remove the outer cutter holder 5, the left and right walls are pinched as shown in FIG. 6, and then pulled up. As shown by the broken line in FIG. is removed from the hook recess 50, and the outer blade holder 5 can be removed. At this time, as shown in FIG. 7, a gap a is created at the base due to the inward deflection of the elastic arm 48.

Generally, hair particles try to enter the main body case 1 through this gap, but in this case, the shock-absorbing elastic plate 11
Since the upper surface of a and llb has elasticity and abuts against the base of the elastic arm 48, the above-mentioned gap can be prevented from occurring, and there is no need to attach a filler such as a sponge body to the conventional gap. .

When removing the outer cutter holder 5, use the elastic arm 4.
Sufficient lifting force is required to deform 8 inward. Generally, a recess is provided in the finger rest at the finger rest position of the outer cutter holder 5 for this purpose, but this is undesirable as it causes discomfort and pain to the fingertips. However, in this case, elastic plates 12a and 12b are attached to the side surface of the outer cutter holder 5 at the finger contact position, and a meat relief recess 12C212d is provided on the inner surface at the position where the finger hits the strongest, so as shown in FIG. The elastic plates 12a and 12b are recessed in response to fingertip force to form a finger-resting surface and prevent slipping. Fine irregularities 12e in the lower part of Fig. 6
, 12f effectively prevent slipping when the outer cutter holder 5 is attached.

Next, the power supply section will be explained in detail with reference to FIGS. 8 and 9.

8 and 9, 51 is a wiring board, a transformer 52 with a temperature fuse 57, a rectifier 53, and a rechargeable battery 54.
, a display light emitting diode 55, and a display current limiting resistor 56 are respectively soldered and mounted at the positions indicated by the dashed lines in FIG. Spot welded.

The wiring state is as shown in FIG.

As shown in FIG. 11, the switch unit 18 has an H-shaped movable contact plate 60 placed on the contacts 65 and 66 exposed on the lower surface of the wiring board 51, an operation plate 61 mounted on this, and a mounting frame 62 mounted from above. At the same time, the 8-wood pins 63 protruding from the mounting frame 62 are inserted into the positioning holes 64 provided on the periphery of the switch part 18 of the wiring board 51, and only the pins 63 at the four corners are thermally deformed to be used as fixing means, and the remaining Four pins 63 protruding from the center are used as positioning pins for the rechargeable battery 54.

A conductive plate 67 having a U-shaped tip is spot welded to one end of the rechargeable battery 54, and a plurality of elongated holes 69, 70.
1 is provided, and the elongated hole 69 is formed according to the total length of the rechargeable battery 54.
, 70.71 from each position, and insert the U from below into the open state of the elongated hole 69, 70.71 that is created when this bending is performed.
Temporary positioning can be achieved by inserting the character-shaped conductive plate 67 and pulling it upward, and soldering can be carried out as is. Further, by providing the elongated holes 69, 70, 71, it is also possible to prevent deformation stress during bending from affecting the inside of the wiring board 51. Note that the back side of the switch section 18 (first
A large number of holes 72 are provided on the upper surface in Figure 2, and the contacts 65.6
6 is partially exposed to provide a heat dissipation effect when the contacts are opened and closed.

Next, a method for manufacturing the wiring board 51 will be explained.

In FIG. 13, first, conductive pieces 73 patterned based on the wiring diagram shown in FIG. 10 are interconnected and molded so that they do not fall apart. The base material of the conductive piece 73 is made of tin-containing cupronickel alloy and has a thickness of 0.12 to Q, 'lm.
A thin plate of m thickness is patterned by pressing or etching. Although the pattern shown in FIG. 13 is for one machine, it is convenient for post-processing to continuously form it into a hoop-shaped thin plate.

Next, this patterned conductive piece 73 is loaded into a synthetic resin injection mold, and a substrate 51 having a thickness of 2 mm shown in FIG. 9 is molded from glass fiber-containing ABS resin. In this state, the conductive pieces 73 are connected to each other and are not configured as a circuit, so they are cut by a press at the point indicated by G in FIG. 13. At this time, the stress caused by pressing tends to promote partial deformation of the wiring board 51, but in this case, by arranging the cut portion on the outer periphery of the board 51, for example, as shown at 74, 75, 76, cracks due to the stress, Chips and deformation can be suppressed.

In particular, by detouring the conductive piece 73 to the outside of the substrate at the portion indicated by the reference numeral 74, the cutting portion can be proactively moved away from the substrate 51, and the degree of freedom in pattern creation can be improved.

Further, the portion indicated by the reference numeral 76 is connected by making a detour to connect the conductive pieces 73, but the broken line portion is cut while leaving a certain length.

By cutting outside the board in this way, the wiring board 5
When a partial protruding piece K i K 2+ K 3 is formed from 1 and this wiring board 51 is assembled into the main body case 1, the press edge is caught on the inner wall surface of the main body case 1, and a positioning action with elasticity is achieved. Therefore, when installing the wiring board 51, it is sufficient to simply push the wiring board 51 into the main body case 1.

The above power supply part is a rechargeable power supply that is equipped with a transformer 52 itself, but it is a so-called rechargeable power supply that has two types of power supply that are popular in recent years: a direct drive power supply using an external power supply and a rechargeable power supply that is charged by an external power supply. In the case of a 2-way type, it is inconvenient to manufacture a separate wiring board from the standpoint of versatility and economy. Therefore, a method for manufacturing a wiring board that satisfies both will be described below.

The rechargeable power supply is as explained in Figure 10.13, but the circuit for the 2-way type is shown in Figure 15.
As shown in the figure. Pl is the so-called adapter side that converts commercial power to the necessary low DC voltage, and fuses TF2. ) consists of a lance T4 and diodes D, D2 that rectify the AC low voltage of the transformer T4 into DC low voltage, and its output is the first
The power is supplied to the power source P2 on the main body side through a plug P3 indicated by a broken line in FIG. The main body side power source P2 is composed of a charging current limiting resistor R8, a rechargeable battery 54, a display light emitting diode 55, a display current limiting resistor 56, and a switch section 18, and the terminal of the motor 24 is connected to the output end. FIG. 17 shows a patterned state of this main body side power source P2. The pattern itself is the same as that shown in FIG. 13 of the rechargeable power supply described above, and the shape after injection molding is also the same, but the part cut by press working (indicated by Q) is slightly different.

The major differences are as follows. In the one shown in FIG. 17, the first
As shown in Figure 6, a conductive piece 80 connects the connecting pins 78 and 79 of the boat-shaped bottom case 4' into which the plug P3 is inserted and connected.
．． 81 was left without press cutting, while the 13th
The one shown in the figure has the above-mentioned conductive piece 8 on the power supply connection plate 77.
0.81 is removed by press cutting, the leaf springs 82.83 are left, and the leaf springs 82.83 are configured to slide into contact with the plug blade 84 that is inserted into a commercial power outlet.

Therefore, a dedicated wiring board 5 for the rechargeable power supply and the 2-way
There is no need to mold each 1.51', and it is only necessary to slightly change the cutting position by press working (for example, it is sufficient to simply change the punch position of the press mold, which is economically superior).

In this method of manufacturing a wiring board in which pre-patterned conductive pieces are injection-molded with synthetic resin as a mechanical strength structural material and embedded, it is important to note that the buried conductive pieces are bent into a curved shape due to the injection molding pressure. The substrate itself may warp due to the difference in shrinkage rate between the conductive piece and the synthetic resin. For this reason, when parts such as wide transformers or straight rod-shaped rechargeable batteries are mounted and mounted, gaps tend to occur between the board and these parts, causing parts to wobble and soldered parts to become incomplete, so this is not preferable. do not have.

Therefore, in this case, the surface of the wiring board 51 on which the components are mounted, that is, the surface 51a shown in FIG. 9, is almost completely covered with synthetic resin, while the surface on which the component lead wires are soldered In other words, holding ribs 87°8B, 89.90 are provided to open most of the surface 51b appearing in FIG. 19 and to prevent the conductive piece 73 from floating up.
8B and 89.90 are extended and crossed in a straight line, so that the warp due to the surface 51a side is pulled in the opposite direction and absorbed. Of course, it is possible to absorb this type of shrinkage strain by mixing insulating reinforcing materials such as glass fibers into the synthetic resin, but this is insufficient, so a linear shape with strong mechanical strength is used. By arranging the conductive pieces 73 in a lattice pattern with a large area within the frame, it is possible to improve the holding performance of the conductive pieces 73 during molding, making it easier to prevent positional displacement due to injection pressure, and also to prevent the conductive pieces 73 from being exposed within the frame. Since the conductive piece 73 is wide, thermal deformation of the synthetic resin by the tip of the soldering iron during soldering of components and partial lifting of the conductive piece 73 due to this thermal deformation can be prevented. The structure of the power supply part and the manufacturing method of the wiring board described above can be effectively applied not only to electric shavers but also to rechargeable flashlights and other small electric devices.

Note that the power supply connection plates 77 and 77' have projecting pieces 85 on both ends,
85' is temporarily assembled by elastically fitting into recesses 86, 86' provided on both inner walls of the boat-shaped bottom case 4.4'. An example thereof is shown in FIG.

In addition, 91.92 in Fig. 14 indicates the rechargeable battery 54 and the motor 24.
93.94 is a cushioning material in the form of sponge or rubber tape that elastically presses the elastic plates 11a and llb, respectively, and
The hook-shaped hook is a protrusion for easy attachment to the case, and the notch formed on the mating surface of the two-part case 2.3 is used to elastically deform the hole 95 and hook it. When 11a and llb are deformed, the above-mentioned hooks expand and deform to hold the protrusions 93 and 94 even more firmly, and the elastic plate 11a.

The amount of deformation of 11b can be compensated for. Also, for this purpose, the mating surfaces of the front and back cases 2.3 and the elastic plates 11a, llb
A gap S is provided between them as shown in FIG.

〔effect〕

According to the present invention having the above configuration, the wiring board 5 is formed by covering the patterned conductive piece 73 with synthetic resin.
1 is stored in the main body case 1. 21) In a small electric device, a part of the conductive piece 73 is protruded outside the wiring board 51 to form a protruding piece 3, and the wiring board 51 is stored in the main body case 1. In this state, the protruding piece 3 is brought into elastic contact with the inner wall of the main body case 1 and the wiring board 51 is positioned. The wiring board can be fixed by the protruding piece formed on the board, and the mounting structure can be simplified.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view showing an embodiment of the present invention, Fig. 2 is an exploded view of the head of the embodiment, Fig. 3 is a cutaway cross-sectional view of a switch section of the embodiment, and Fig. 4 is a switch section of the same embodiment. An explanatory diagram of the operating state of
Fig. 5 is an explanatory diagram of the operating state in the case of irregular use of the Sui-Sochi part, Fig. 6 is a vertical cross-sectional view of the head of the same embodiment, Fig. 7
The figures are a diagram of the outer blade holder mounting structure of the same embodiment, Fig. 8 is a perspective view of the drive and power supply assembly of the same embodiment, Fig. 9 is an exploded perspective view of the power supply part of the same embodiment, and Fig. 10 is A circuit diagram of the power supply section, Fig. 11 is a cross-sectional view of the switch section of the power supply section, Fig. 12 is an exploded view of the switch section, Fig. 13 is a plan view of the wiring board of the power supply section, and Fig. 14 is a cross-sectional view of the switch section of the power supply section. Cross-sectional view of the main body of the same example, 1st
Figure 5 is a circuit diagram of another embodiment of the power supply section of this invention, the first
6 is a perspective view of the power supply unit assembly of the same embodiment, FIG. 17 is a plan view of the wiring board of the same embodiment, FIG. 18 is a lower vertical sectional view of the same embodiment, and FIG. 19 is a diagram showing the implementation of the present invention. FIG. 9 is a rear perspective view of the drive power supply assembly shown in FIG. 8 in the example. 1...Main body case 51...Wiring board 73...Conductive piece 3...Protruding piece. Applicant: Kyushu Hitachi Maxell Co., Ltd. Representative: Seigo Sato

Claims (1)

[Claims] In a small electric device in which a wiring board 51 formed by covering a patterned conductive piece 73 with synthetic resin is housed in a main body case 1, a part of the conductive piece 73 is covered with a wiring board 5.
1 to form a protruding piece K_3 extending outward from the wiring board 5.
1 stored in the main body case 1, the above protruding piece K_3
is in elastic contact with the inner wall of the main body case 1, and a wiring board 51 is positioned.