JPH08451A - Mounting structure of operation panel - Google Patents

Abstract

PURPOSE:To provide a mounting structure of an operation panel with limited number of parts and less assembling manhour and with higher positioning precision. CONSTITUTION:An operation panel 50 has a surface shape enough to cover a mounting opening 41 of a shoulder body 40 and is formed by applying a resin sheet 55 on the surface of a resin molded plate 51 having a through hole 52 for operation. A printed board 60 has a surface shape enough to cover the mounting opening 41 of the shoulder body 40 while a push switch 62 and a spacer 63 are mounted on the surface thereof. The rim part of the mounting opening 41 of the shoulder body 40 is grasped with spacers 63 of the operation panel 50 and the printed board 60.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for mounting an operation panel, for example, a structure for mounting an operation panel of an electric rice cooker.

[0002]

2. Description of the Related Art Conventionally, as a mounting structure for an operation panel,
For example, it may be applied to an electric rice cooker as shown in FIG. That is, after the holder 2 having the printed circuit board 1 attached thereto is assembled to the bottom body 3, the shoulder body 4 is fitted to the bottom body 3 so that the printing is performed from the display window 5 of the shoulder body 4 covered with the transparent seal. LCD surface-mounted on substrate 1
6 is made visible.

[0003]

However, in the above electric rice cooker, the printed circuit board 1 is assembled through the holder 2, so that the number of parts and the number of assembling steps are large,
Productivity is low. Further, since the printed circuit board 1 is assembled through the holder 2 attached to the bottom body 3, assembly errors are accumulated, and the positioning accuracy of the printed circuit board 1 with respect to the shoulder body 4 is low. Therefore, the distance between the tip end portion of the push switch 7 surface-mounted on the printed circuit board 1 and the shoulder body 4 varies, and the pushing amount for operating the push switch 7 becomes uneven, resulting in variation in the operation feeling. There is a problem.

In view of the above problems, it is an object of the present invention to provide a mounting structure for an operation panel which has a small number of parts and a small number of assembling steps and has a high positioning accuracy.

[0005]

In order to achieve the above-mentioned object, the mounting structure for an operation panel according to the present invention has a surface shape capable of covering the mounting opening of the housing, and
An operation panel made by attaching a resin sheet to the surface of a resin molding plate having through holes for operation, and a surface shape capable of covering the mounting opening of the housing, and having a play in the through holes of the operation panel. The input electronic component to be fitted is mounted so as to sandwich the edge portion of the mounting opening of the housing with a printed circuit board on which the electronic component is mounted. Further, the printed circuit board may be provided with a spacer provided on the surface thereof so as to abut against an inner surface edge portion of the opening.

[0006]

Therefore, according to the present invention, the printed circuit board is directly attached to the housing.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment in which the present invention is applied to an electric rice cooker will be described with reference to the accompanying drawings of FIGS. That is, the electric rice cooker according to the present embodiment,
In general, it is composed of a bottom body 10, a protective frame 20, an inner body 30, a shoulder body 40, a lid 70, and a pot 80.

The bottom body 10 has a recess 11 formed on its bottom surface.
After the cooling fan 12 is housed and fixed in the printed circuit board 14, an electronic component (not shown) and a heat sink 13 are mounted on the printed circuit board 14.
Assembly, and then cover the protruding partition wall 15 with the cover 1
6 is attached. Therefore, the air sucked by the cooling fan 12 from the slit 11a provided on the side surface of the recess 11 is blown to the heat sink 13 to cool the electronic component.

The protective frame 20 is a heat-resistant resin molded product having a substantially deep dish shape, and a temperature sensor 21 is attached to a through hole 20a provided in the side wall of the protective frame 20 in the vicinity of the round end. Also,
The protection frame 20 includes a coil 2 wound concentrically on the bottom surface thereof.
2 is provided, and a bent ferrite 23 is mounted on it, and a thermal fuse 24 is provided on the bottom surface thereof.

The thermal fuse 24 is shown in FIGS.
As shown in FIG. 2, the protrusion 2 protruding from the bottom surface of the protection frame 20 after being positioned in the recess 20 b provided on the bottom surface of the protection frame 20.
The positioning hole 25a of the protective cover 25 is fitted to the position 0d for positioning, and then the protective cover 25 is attached to the boss 20c of the protective frame 20 by screwing.

According to this embodiment, since the entire thermal fuse 24 is completely covered with the protective cover 25, the thermal fuse 2 is heated by the air blown from the cooling fan 12 described above.
4 is not cooled. Therefore, the thermal fuse 24 has an advantage that it is surely blown when the protective frame 20 reaches a predetermined temperature and becomes safer than when it is not covered with the protective cover 25.

The protective frame 20 is fixed to the bottom body 10 with screws (not shown) after positioning the annular reflector plate 26 on the bottom body 10. Further, the inner body 30 of a cylindrical body made of a thin metal plate is fitted to the inner peripheral edge of the opening of the protective frame 20, and then the shoulder body 40 is fitted and fixed to the bottom body 10, thereby the main body of the electric rice cooker. Is assembled.

As shown in FIG. 2, the shoulder body 40 has an operation panel 50 and a printed circuit board 60 attached to the attachment openings 41 formed on the side walls thereof from the front and back surfaces, respectively.

As shown in FIG. 3, the operation panel 50 comprises a curved transparent resin molding plate 51 having a surface shape capable of covering the opening 41, and the resin molding plate 51 is
An operation through hole 52 is provided at a position corresponding to a push switch 62 described later, and a locking claw 53 and an attachment boss 54 are appropriately provided on the back surface thereof (FIG. 2).
Further, the resin molding plate 51 has a through hole 52 on its surface.
A printed resin sheet 55 having a bulged portion 56 is attached at a position corresponding to, while a double-sided tape (not shown) is attached to the back surface thereof. Reference numeral 57 is a transparent display window.

The printed circuit board 60, as shown in FIG.
An LCD 61 is mounted on the surface thereof, and a push switch 62 is mounted at a position corresponding to the operation through hole 52 of the resin molding plate 51. Furthermore, the printed circuit board 6
No. 0 has a spacer 63 arranged on the surface thereof so as to abut against the inner edge of the opening 41. Note that the printed wiring is not shown for convenience of description.

Therefore, when the operation panel 50 is fitted into the opening 41 of the shoulder body 40, the double-sided tape is applied to the opening 41.
While being attached to the outer surface edge portion, the locking claw 53 provided on the operation panel 50 is temporarily locked by being locked to the inner surface edge portion of the opening 41. On the other hand, the positioning claws 4 protruding from the ceiling surface of the shoulder body 40
After the printed circuit board 60 is vertically dropped onto and brought into contact with the second substrate 2, the printed circuit board 60 is rotated toward the opening 41 side with one end of the printed circuit board 60 as a fulcrum, and the tip end of the spacer 63 is abutted against the inner surface edge of the opening 41. Then, a screw (not shown) is screwed into the boss 54 of the operation panel 50 from the screw hole 64 (FIG. 4) of the printed board 60, so that the opening 41 of the shoulder body 40 is formed between the operation panel 50 and the printed board 60. Hold the edges of.

According to this embodiment, since the printed circuit board 60 is directly attached to the shoulder 40, the positioning accuracy of the printed circuit board 60 with respect to the shoulder 40 is high. In addition, a large number of operating through holes 52 for operating the push switch 62.
Is provided on the operation panel 50, the shoulder 40 need only be provided with one opening 41. Therefore, the shoulder 40
There is an advantage that a mold for molding the mold can be easily manufactured.

The lid 70 has a planar shape capable of closing the upper opening of the shoulder body 40. The lower lid 72 is engaged and fixed to the lower surface of the upper lid 71, and the heat radiating plate 7 is attached to the lower surface of the lower lid 72.
3 is attached. The peripheral edge of the heat dissipation plate 73 is sealed via a seal member 74 attached to the lower lid 72 via a stopper 78 engaged with the lower lid 72. As shown in FIG. 5, the sealing material 74 is composed of a holding portion 75 having an approximately J-shaped upper end portion and tip portions 76 and 77 having a substantially Y-shaped divided lower end portion. Stop 7
While being pressed against the lower surface of 8, the tip 77 is pressed against the upper edge of the opening of the pot 80 housed in the protective frame 20. The lid 70 is rotatably supported by the shoulder body 40 via a hinge portion (not shown).

According to this embodiment, the two tips 76, 7 are
Since 7 comes into contact with the stopper 78 and the pot 80 for sealing, even if there is variation in the dimensional accuracy in the vertical direction,
The tips 76, 77 elastically deform and absorb. For this reason,
There are advantages that the assembly and adjustment are easy and a high sealing property can be secured.

In the above-described embodiment, the case where the invention is applied to the electric rice cooker has been described, but the invention is not necessarily limited to this.
For example, it may be applied to an electromagnetic cooker, an electric fryer, a hot plate, an electric pot, a gas rice cooker, an electric pan, a microwave oven, a toaster oven, a vacuum cleaner, an iron, a radio, a cassette tape recorder, a television, and a stereo.
Further, in the above-mentioned embodiment, the case where the operation panel is attached to the shoulder of the housing of the electric rice cooker has been described. However, the present invention is not limited to this and may be attached to the lid.

[0021]

As is apparent from the above description, according to the operation panel mounting structure according to claim 1 of the present invention,
Since the holder used in the conventional example is not required, the number of parts and the number of assembling steps in the assembly line are reduced, and the productivity is improved. Further, since the printed circuit board is directly attached to the housing, the positioning accuracy of the printed circuit board with respect to the housing is high. Therefore, there is no variation in the distance between the housing and the tip of the input electronic component that is surface-mounted on the printed circuit board, and the pushing amount for operating the input electronic component is uniform, so there is variation in the feeling of operation. Absent. According to the second aspect of the present invention, there is an effect that the arrangement of parts and the design of the housing are facilitated and the degree of freedom in design is increased.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing an embodiment when the present invention is applied to an electric rice cooker.

FIG. 2 is an exploded cross-sectional view of main parts of the embodiment shown in FIG.

FIG. 3 is a front view of the operation panel shown in FIG.

FIG. 4 is a front view of the printed circuit board shown in FIG.

5 is an enlarged view of a main part of the embodiment shown in FIG.

FIG. 6 is an exploded cross-sectional view of main parts of the embodiment shown in FIG.

FIG. 7 is a perspective view of a main part of the embodiment shown in FIG.

FIG. 8 is a partial cross-sectional view of an electric rice cooker according to a conventional example.

[Explanation of symbols]

10 ... Bottom body, 20 ... Protective frame, 40 ... Shoulder body, 41 ... Mounting opening, 50 ... Operation panel, 51 ... Resin molding plate, 52 ...
Through hole for operation, 55 ... Resin sheet, 56 ... Swelling portion, 60
... Printed circuit board, 63 ... Spacer, 62 ... Push switch.

Claims (2)

[Claims] 1. An operation panel having a resin sheet adhered to the surface of a resin molding plate having a surface shape capable of covering a mounting opening of a housing and having an operation through hole.
A printed circuit board having a surface shape capable of covering the mounting opening of the housing and surface-mounted with the input electronic component loosely fitted in the through hole of the operation panel, and an edge portion of the mounting opening of the housing. The operation panel mounting structure is characterized in that it is mounted so as to sandwich. 2. The mounting structure for an operation panel according to claim 1, wherein the printed circuit board is provided with a spacer on its surface that abuts against an inner edge of the opening.