JP2010032083A - Speaker mounting structure of heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To thermally protect a speaker, to stabilize an acoustic pressure level, to simplify the mounting of the speaker and to reduce costs, in a speaker mounting structure of a heating device. <P>SOLUTION: The speaker 1 is held while being pinched by locking claws 2a of an elastic control board holder 2 at its recessed sections 1a, and radiation heat from a heating section 6 is blocked by the control board holder 2 and a control board 4. Further the speaker 1 is disposed on end sections of a plurality of mounting legs 2c disposed on the control board holder 2, the tapered locking claws 2 are inserted into mounting holes 8a formed on a speaker mounting wall face 8, and slid, so that a frame part is closely kept into contact with the speaker mounting wall face 8 and held, thus parts such as screws can be eliminated. Furthermore, a cylindrical section 11 is formed on an outer periphery of a holding means of the control board holder, and a resonance space is formed while covering the speaker, thus the acoustic pressure level can be stabilized. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a speaker mounting structure used in a heating device.

  Recently, an increasing number of cookers are equipped with a speaker inside to convey information to users by voice. Mounting the speaker requires additional parts, an increase in assembly man-hours, wiring processing, and costs.

Conventionally, this type of speaker mounting structure has a speaker holding member provided on a printed circuit board, and a core portion of the recessed speaker is inserted and fixed. Further, a spring is provided inside the holding member as a speaker mounting surface and a speaker frame press contact means. Etc., and the speaker is pressed against the mounting surface from the rear surface (see, for example, Patent Document 1).
Japanese Utility Model Publication No. 62-2861

  However, in the conventional configuration, when used for a heating device (for example, a microwave oven with an oven) that becomes high in temperature, it is necessary to consider heat shielding, etc., with another part. This leads to cost increase.

  The present invention solves the above-mentioned conventional problems, and a speaker is provided on the side opposite to the heating chamber, and a holding means for holding the speaker is integrally formed on the control board holder of the control board. The speaker held by the means is press-fixed to the speaker mounting wall of the main body with the control board holder, and the speaker is shielded by the control board and the control board holder, so that the speaker is not exposed to the high temperature part and is inexpensive. With the configuration, the durability of the speaker can be improved.

  In order to solve the above conventional problems, a speaker mounting structure for a heating apparatus according to the present invention includes a main body, a heating chamber provided in the main body, a heating means for heating an object to be heated in the heating chamber, and the heating In the heating apparatus including a control unit for controlling the means and a speaker that operates based on an output from the control unit, the control unit is configured by a control board disposed in a space between the heating chamber and the main body. The speaker is held on a side of the control board opposite to the heating chamber by holding means integrally formed with a control board holder for holding the control board, and the control board holder and a speaker mounting wall surface of the main body It is fixed by pressure welding.

  As a result, since heat is shielded by the control board and the control board holder, the high temperature part of the speaker is not irradiated, and the durability of the speaker can be improved with an inexpensive configuration.

  According to the speaker mounting structure of the heating device of the present invention, the radiant heat from the heating unit is blocked by the control board and the control board holder, and no dedicated parts are required for the thermal protection of the speaker. The cost can be reduced.

  Moreover, since the screw is not used for the pressure contact between the speaker and the mounting wall surface, it can be finished at a low cost. Further, since the resonance space is provided so as to cover the speaker, the sound pressure level can be increased without increasing the current value.

  According to a first aspect of the present invention, there is provided a main body, a heating chamber provided in the main body, a heating unit for heating an object to be heated in the heating chamber, a control unit for controlling the heating unit, and an output from the control unit. In the heating apparatus including a speaker that operates based on the control unit, the control unit includes a control board disposed in a space between the heating chamber and the main body, and the speaker is opposite to the heating chamber of the control board. It is held on the side by a holding means integrally formed with a control board holder for holding the control board, and is pressed and fixed by the control board holder and a speaker mounting wall surface of the main body.

  Thereby, since heat is shielded by the control board and the control board holder, the high temperature part of the speaker is not irradiated, and the durability of the speaker can be improved with an inexpensive configuration.

  In a second aspect based on the first aspect, the speaker has a concave portion between the body portion and the horn portion, and the holding means of the speaker has a plurality of struts having an engaging portion at an end portion. And holding the speaker by elastically deforming the support column and engaging the engaging portion with the concave portion. Thereby, attachment and removal of a speaker can be performed easily.

  According to a third invention, in the first or second invention, a plurality of mounting legs are formed on the control board holder, a locking piece is provided at an end of the mounting leg, and the locking piece is used as the speaker. The locking piece is engaged with the hole edge of the mounting hole by being inserted and slid into the mounting hole provided on the mounting wall surface, and the locking surface of the locking piece is formed in a tapered shape so that the locking piece is The structure is configured to press contact with the hole edge of the mounting hole.

  Thereby, even if it does not fix with a screw, the press-contact to a mounting surface can be ensured and the sound pressure level of a speaker can be stabilized.

  In a fourth aspect based on any one of the first to third aspects, the control board and the speaker are provided in a bottom space between the main body and the heating chamber, and a bottom plate of the main body A cooling air intake hole is provided, and a cooling fan is provided in the bottom space. Thereby, the temperature can be reliably reduced to the speaker including the control board and the control board holder.

  According to a fifth invention, in any one of the first to fourth inventions, a cylindrical portion is provided on an outer periphery of the holding means of the control board holder, the cylindrical portion covers the speaker, and the cylindrical portion and the A resonance space is formed between the speaker mounting wall surface and the speaker mounting wall surface. Thereby, the sound pressure level can be improved without setting the speaker current value high.

(Embodiment)
FIG. 1 is a speaker mounting structure diagram of a heating device according to an embodiment of the present invention. The speaker 1 is held in the concave portion 1a so as to be sandwiched by the locking claws 2a provided on the control board holder 2, and the rear surface 1b is in surface contact with the flat portion 2b on the bottom surface of the control board holder 2.

  The speaker 1 can be easily attached to and detached from the control board holder 2 by elastically expanding the locking claws 2 a provided on the control board holder 2. A control substrate 4 is provided above the control substrate holder 2, and a space portion 7 is provided between the control substrate holder 2 and the heating unit 6.

Here, since the radiant heat from the heating unit 6 is blocked by the control board holder 2 and the control board 4 and hardly transmitted to the speaker 1, the durability of the speaker 1 can be improved.

  FIG. 2 is a cross-sectional view showing a state where the speaker 1 and the speaker mounting wall surface 8 are press-fitted and engaged.

  The speaker 1 is provided at the end of the mounting legs 2c provided on the control board holder 2 in a plurality, and the locking claws 2d formed in a taper shape are attached to the mounting holes 8a provided on the speaker mounting wall surface 8. By inserting and sliding, the frame portion is held in pressure contact with the speaker mounting wall surface 8.

  According to the above configuration, it is not necessary to fix the speaker to the pressure contact with screws, and the number of manufacturing steps can be reduced and the cost can be reduced.

  Further, if a cooling fan (not shown) is provided in the space 7, the temperature rise of the speaker can be further suppressed.

  As shown in FIG. 3, a cylindrical portion 11 is provided on the outer periphery of the holding means of the control board holder 2, and a resonance space 10 is provided on the cylindrical portion 11 and the speaker mounting wall surface 8. Thereby, the volume of the speaker can be improved.

  As described above, the present invention is particularly applicable to heating equipment such as a microwave oven, and radiant heat from the heating unit is blocked by the control board and the control board holder, and a dedicated component is required for thermal protection of the speaker. Therefore, the number of parts and the number of assembly steps are reduced, and the cost is reduced.

  Moreover, since the screw is not used for the pressure contact between the speaker and the mounting wall surface, it can be finished at a low cost. Furthermore, since a resonance space is provided to cover the speaker, it is possible to increase the sound pressure level without increasing the current value, so it is applicable to all product fields that have high-temperature parts and require speaker mounting. it can.

Speaker mounting structure diagram of heating device in Embodiment 1 of the present invention Sectional view of the speaker mounting structure in a state where the speaker and the speaker mounting wall surface are in pressure contact engagement Sectional view of the speaker mounting structure in a state where a cylindrical portion is provided on the outer periphery of the holding means of the control board holder to form a resonance space

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Speaker 2 Control board holder 2a Locking claw 2b Plane part
2c Mounting leg 2d Locking claw 4 Control board 6 Heating chamber 7 Space portion 8 Speaker mounting wall surface 10 Resonance space 11 Tubular portion

Claims (5)

A main body, a heating chamber provided in the main body, a heating unit that heats an object to be heated in the heating chamber, a control unit that controls the heating unit, and a speaker that operates based on an output from the control unit. In the heating apparatus provided, the control unit includes a control board disposed in a space between the heating chamber and the main body, and the speaker is disposed on the control board on the side opposite to the heating chamber. A heating device that is held by a holding means that is integrally formed with a control board holder that holds and is pressed and fixed between the control board holder and a speaker mounting wall surface of the main body. The speaker has a recess between the body portion and the horn portion, and the speaker holding means has a plurality of struts having engaging portions at end portions, and elastically deforms the struts to deform the engagement. The heating apparatus according to claim 1, wherein the speaker is held by engaging a joint portion with the recess. A plurality of mounting legs are formed on the control board holder, a locking piece is provided at an end of the mounting leg, and the locking piece is inserted into a mounting hole provided in the speaker mounting wall surface and slid. The engaging piece is engaged with a hole edge of the mounting hole, and a locking surface of the locking piece is formed in a tapered shape so that the locking piece is press-fitted and engaged with the hole edge of the mounting hole. The heating apparatus according to 1 or 2. The control board and the speaker are provided in a bottom space between the main body and the heating chamber, a cooling air intake hole is provided in a bottom plate of the main body, and a cooling fan is provided in the bottom space. The heating apparatus according to any one of claims 1 to 3. The cylindrical part is provided in the outer periphery of the holding | maintenance means of the said control board holder, the said cylindrical part covers the said speaker, and the resonance space is comprised between the said cylindrical part and the said speaker mounting wall surface. The heating apparatus of any one of Claims.