JP3214979B2 - Operation panel mounting structure - Google Patents

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, there is a case where the present invention is applied to an electric rice cooker as shown in FIG. That is, after assembling the holder 2 to which the printed circuit board 1 is attached 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 board 1
6 can be visually observed.

[0003]

However, in the above-mentioned electric rice cooker, since the printed board 1 is assembled via the holder 2, the number of parts and the number of assembly steps are large.
Low productivity. Further, since the printed board 1 is assembled via the holder 2 attached to the bottom body 3, assembly errors are accumulated, and the positioning accuracy of the printed board 1 with respect to the shoulder body 4 is low. For this reason, the distance between the tip of the push switch 7 surface-mounted on the printed circuit board 1 and the shoulder 4 varies, and the pushing amount for operating the push switch 7 becomes uneven, so that the operational feeling varies. There is a problem.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a mounting structure for an operation panel having a small number of parts and a small number of assembly steps and a high positioning accuracy.

[0005]

According to the present invention, there is provided an operation panel mounting structure having a surface shape capable of covering a mounting opening of a housing to achieve the above object, and
An operation panel in which a resin sheet is adhered to the surface of a resin molded plate having an operation through hole, and a surface shape capable of covering the mounting opening of the housing, and having a play in the operation panel through hole. In a mounting structure of an operation panel comprising a printed circuit board on which input electronic components to be fitted are surface-mounted, the operation panel temporarily fixed to a surface side edge of the mounting opening with a double-sided tape; and a rear side ceiling of the housing. The printed circuit board, which is positioned on the rear surface side of the housing by being locked to a positioning claw projecting from the surface, is integrally connected to each other by a connecting member, and the operation panel and the printed circuit board are used to mount the housing. The configuration is such that the edge of the portion is sandwiched. Further, the printed circuit board may be provided with a spacer provided on the surface thereof, the spacer being in contact with an inner edge of the opening.

[0006]

According to the present invention, the printed circuit board is directly mounted on the housing.

[0007]

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 rice cooker according to the present embodiment is:
Generally, it comprises a bottom body 10, a protective frame 20, an inner trunk 30, a shoulder body 40, a lid 70, and a pot 80.

The bottom body 10 has a recess 11 formed on the bottom surface thereof.
After accommodating and fixing the cooling fan 12 to the electronic component (not shown), the printed circuit board 14 on which the heat sink 13 is mounted
Then, cover 1 is attached to projecting partition wall 15.
6 is attached. Therefore, the air sucked by the cooling fan 12 from the slit 11 a provided on the side surface of the recess 11 is blown to the heat sink 13 to cool the electronic component.

The protection 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 near the round end of the side wall. Also,
The protective frame 20 includes a coil 2 concentrically wound on the bottom surface thereof.
2, a bent ferrite 23 is mounted thereon, and a thermal fuse 24 is provided on the bottom surface thereof.

FIG. 6 and FIG.
As shown in FIG. 5, after the protrusion 2 is positioned in the concave portion 20b provided on the bottom surface of the protection frame 20, the protrusion 2 protrudes from the bottom surface of the protection frame 20.
The positioning hole 25a of the protective cover 25 is fitted and positioned at 0d, and then the protective cover 25 is attached to the boss 20c of the protective frame 20 by screwing.

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

Then, after positioning the annular reflecting plate 26 on the bottom body 10, the protection frame 20 is fixed to the bottom body 10 with screws (not shown). 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, so that the main body of the electric rice cooker is obtained. Is assembled.

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

As shown in FIG. 3, the operation panel 50 comprises a curved transparent resin molded plate 51 having a surface shape capable of covering the opening 41, and the resin molded plate 51 is
An operation through hole 52 is provided at a position corresponding to a push switch 62 to be described later, and a locking claw 53 and a mounting boss 54 are appropriately protruded from the back surface thereof (FIG. 2).
Further, the resin molded plate 51 has the through hole 52 on its surface.
While a printed resin sheet 55 having a bulging portion 56 is adhered to a position corresponding to, a double-sided tape (not shown) is adhered to the back surface. In addition, 57 is a transparent display window.

The printed circuit board 60 is, as shown in FIG.
An LCD 61 is mounted on the surface, and a push switch 62 is mounted at a position corresponding to the operation through hole 52 of the resin molded plate 51. Further, the printed circuit board 6
Reference numeral 0 denotes a spacer 63 on the surface of the opening 63, which is in contact with the inner edge of the opening 41. In addition, the printed wiring is not illustrated for convenience of explanation.

Therefore, when the operation panel 50 is fitted into the opening 41 of the shoulder 40, the double-sided tape is applied to the opening 41.
And the locking claw 53 provided on the operation panel 50 is temporarily locked by being locked to the inner surface edge of the opening 41. On the other hand, the positioning claw 4 protruding from the ceiling surface of the shoulder body 40
After the printed circuit board 60 is dropped vertically and brought into contact with the opening 2, the printed circuit board 60 is rotated toward the opening 41 with one end of the printed circuit board 60 as a fulcrum, and the tip of the spacer 63 is brought into contact with the inner 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 circuit board 60, so that the opening 41 of the shoulder 40 is connected between the operation panel 50 and the printed circuit board 60. Pinch the edge of.

According to this embodiment, since the printed board 60 is directly attached to the shoulder 40, the positioning accuracy of the printed board 60 with respect to the shoulder 40 is high. Further, in order to operate the push switch 62, a large number of operation through holes 52 are provided.
Is provided on the operation panel 50, so that the shoulder 40 only needs to provide one opening 41. For this reason, the shoulder 40
There is an advantage that the manufacture of a mold for molding the slab is facilitated.

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 lower surface of the lower lid 72 is
3 is attached. The peripheral edge of the heat radiating plate 73 is sealed by 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 includes a holding portion 75 having an upper end having a substantially J-shape and front ends 76 and 77 having lower ends divided into a substantially Y-shape. Is a stop 7
8, while the front end 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 40 via a hinge (not shown).

According to the present embodiment, the two tip portions 76, 7
7 abuts against the stopper 78 and the pan 80 to seal, so that even if the dimensional accuracy in the vertical direction varies,
The tips 76 and 77 are elastically deformed and absorbed. For this reason,
There is an advantage that assembly adjustment is easy and high sealing performance can be ensured.

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

[0021]

As is apparent from the above description, according to the operation panel mounting structure of the first aspect of the present invention,
The holder used in the conventional example becomes unnecessary.
For this reason, the number of parts and the number of assembly steps on the assembly line are reduced, and the productivity is improved. Further, the operation panel temporarily fixed to the front side edge of the mounting opening with double-sided tape and the positioning claw projected from the rear surface side ceiling surface of the housing are engaged with the operation panel and positioned on the rear surface side of the housing. The printed circuit board is mutually connected and integrated by a connecting member,
An edge of the mounting opening of the housing is sandwiched between the operation panel and the printed circuit board. Therefore, the positioning accuracy of the operation panel and the printed circuit board with respect to the housing is high. As a result, the distance between the tip of the input electronic component surface-mounted on the printed circuit board and the housing does not vary, and the pushing amount for operating the input electronic component becomes uniform, so that the operation feeling varies. Absent. Further, since the edge of the mounting opening of the housing is sandwiched between the operation panel and the printed circuit board, the mounting strength between them is high, and the operation panel and the printed circuit board are not easily dropped from the housing. In the present invention, since the operation panel and the printed circuit board are attached from the front and back sides of the housing, the attachment operation is easy. In particular, the operation panel can be positioned while visually observing it from the front surface side of the housing, so that there is no variation in positioning accuracy, and the operation panel can be mounted with good appearance. Next, an operation through hole for operating the input electronic component is provided on the operation panel. For this reason, it is not necessary to provide an operation hole in the housing, and it is sufficient to provide only one mounting opening, which facilitates the production of a mold for molding the housing. According to the operation panel mounting structure of the second aspect,
The spacer provided on the printed circuit board comes into pressure contact with the edge of the mounting opening of the housing, so that the mounting strength is further improved. Furthermore, there is an effect that the arrangement of parts and the design of the housing are facilitated, and the degree of freedom of design is increased.

[Brief description of the drawings]

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

FIG. 2 is an exploded sectional view of a main part 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.

FIG. 5 is an enlarged view of a main part of the embodiment shown in FIG. 1;

FIG. 6 is an exploded sectional view of a main part of the embodiment shown in FIG. 1;

FIG. 7 is a perspective view of a main part of the embodiment shown in FIG. 1;

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

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Bottom body, 20 ... Protective frame, 40 ... Shoulder body, 41 ... Mounting opening part, 42 ... Positioning claw, 50 ... Operation panel, 51 ...
Resin molded plate, 52 ... through hole for operation, 54 ... boss, 55 ...
Resin sheet, 56 bulge, 60 printed circuit board, 63
... spacer, 62 ... push switch, 64 ... screw hole.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) A47J 27/00 103

Claims (2)

(57) [Claims] 1. An operation panel having a surface shape capable of covering a mounting opening of a housing and having a resin sheet adhered to a surface of a resin molded plate having an operation through hole,
In a mounting structure of an operation panel having a surface shape capable of covering a mounting opening of a housing, and a printed circuit board on which an input electronic component is loosely fitted in a through hole of the operation panel, and a printed circuit board, The operation panel temporarily fixed to the front surface side edge of the mounting opening, and the printed circuit board positioned on the rear surface side of the housing by being locked by a positioning claw protruding from a rear surface ceiling surface of the housing. An operation panel mounting structure, wherein the operation panel and the printed circuit board sandwich an edge of a mounting opening of the housing between the operation panel and the printed circuit board. 2. The mounting structure for an operation panel according to claim 1, wherein a spacer is provided on the surface of the printed circuit board so as to contact an inner edge of the opening.