JP3395613B2 - Cooking device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooking device equipped with a means for detecting the heating status of food by using an infrared sensor.

[0002]

2. Description of the Related Art Generally, a sensor using wavelength such as an infrared sensor is commonly used to detect water vapor, salt, oil, or a mixture of these substances which adheres to the detection portion of the sensor, resulting in detection sensitivity. There is a problem of lowering.

In order to solve the conventional problems of this type, as described in Japanese Patent Publication No. 6-7012, a blower area is provided between the sensor and the food, and the scattered matter is blown off by the wind. It was common to prevent the sensor from adhering to it.

Further, as described in Japanese Patent Application Laid-Open No. 8-100922, a mechanical shutter is provided between the sensor and the food, and the sensor is mainly blocked by the shutter during operation to prevent the scattered matter from the food. There was also something to prevent.

[0005]

However, the above-mentioned conventional means for removing scattered substances by blowing air loses its effect when the blowing fan is stopped. Usually, when the cooking is completed, the motor for the blower fan is stopped, and thereafter, the scattered matter generated from the food in the heating chamber may float on the sensor portion without being blown by the wind. For this reason, there are some equipped with a control means for continuing the operation of the blower fan motor even after the end of heating, but during the blowing time after the end, the next cooking is not done, and the blowing time is appropriately rounded up to the next level. When cooking, there was a problem that the original purpose could not be achieved.

Further, the means for preventing the adherence of scattered materials by means of a mechanical shutter does not give an indication of the cooking situation during operation, and it can be seen only by opening the door of the heating chamber, which is extremely inconvenient.

[0007] More generally, a method of attaching a sheet or film made of a material that easily transmits infrared rays to the detection hole of the infrared sensor to prevent the sensor itself from being soiled is known. It was inevitable that the detection sensitivity would decrease unless the dirt was removed.

[0008]

In order to solve the above problems, the present invention provides a heating and cooking apparatus for detecting the temperature of food provided with an infrared sensor, which heats a small hole for guiding infrared rays emitted from the food to a sensor section. The shutter disk is provided on the ceiling surface or wall surface of the room, and has a shutter disk having an infrared transmitting part and an infrared non-transmitting part alternately, and a protective disk formed of an infrared transmitting material for preventing adherence of scattered objects. Arranged and rotated at an appropriate position between the infrared sensor and the food, the infrared sensor measures the temperature of the food through the infrared transmitting portion of the shutter disk, and the protective disk is closer to the food than the shutter disk. so,
In addition, it is arranged close to the small hole of the heating chamber.

According to the invention described above, the spatter from the food product hits the protective disc before reaching the sensor through the small holes. Therefore, the portion of the protective disk itself facing the small holes will be soiled by the scattered material, but the contamination of the infrared sensor itself can be prevented. Moreover, since the protective disk is rotating, the part facing the small hole is never left unclean. Moreover, the shutter disk also has an infrared transmitting part, and the sensor itself is doubly protected from dirt.

Further, since the protective disc is rotating extremely slowly, if the rotational speed is adjusted to the time of maintenance of the cooking device, it is necessary to replace it with a new protective disc before the dirty surface appears again in the small holes. You can

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A heating and cooking apparatus according to claim 1 of the present invention is an infrared sensor for detecting the temperature of food and a ceiling surface or wall surface of a heating chamber for guiding infrared rays emitted from the food to the infrared sensor section. A shutter disc having an infrared transmitting portion and an infrared non-transmitting portion alternately, and a protective disc formed of an infrared transmitting material for preventing adherence of scattered matter, and the shutter disc is the infrared ray. Arranged and rotated at an appropriate position between the sensor and the food, the infrared sensor measures the temperature of the food through the infrared transmitting portion of the shutter disk, and also measures the infrared non-transmitting portion to be heated. The temperature of the non-existing portion was measured, and the protective disc was arranged closer to the food than the shutter disc and close to the small hole of the heating chamber. Than it is.

The portion of the protective disc itself facing the small holes is contaminated by scattered matter, but the infrared sensor itself can be prevented from being contaminated, and the shutter disc also has an infrared transmitting portion, so that the sensor itself is It is double protected from dirt.

In the heating and cooking apparatus according to the second aspect of the present invention, the protective disk has an extremely large area as compared with the area of the small holes provided on the ceiling surface or wall surface of the heating chamber, and the rotation speed of the shutter disk is It is designed to rotate extremely slowly or intermittently as compared to the conventional method.

Therefore, the portion of the protective disk facing the small hole is never left unclean and the new surface is always exposed to the small hole. Further, if the rotation speed of the protective disk is adjusted to the maintenance time of the heating and cooking apparatus, it is possible to replace the dirty surface with a new protective disk before the dirty surface appears again at the position of the small hole.

According to a third aspect of the present invention, there is provided a heating and cooking device in which an inner gear is formed on the outer circumference of an infrared transmitting material of a protective disc, an intermediate gear which meshes with the inner gear is provided inside the shutter disc, and the shutter disc is driven by an intermittent drive mechanism. The intermediate gear is arranged to be driven to rotate intermittently, and the protective disk is driven to rotate intermittently by the rotational driving force of the shutter disk.

Therefore, the drive motor need only be one motor for driving the shutter disc, and the members relating to the mechanism can be made thin, and the operation is simple and reliable.
The entire device can be manufactured in a small size.

[0017]

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

(Embodiment) FIG. 1 (a) is a sectional view showing the main structure of a heating and cooking apparatus according to an embodiment of the present invention, and FIG. 1 (b) is a detailed sectional view of an infrared sensor portion of the heating and cooking apparatus. Two
[Fig. 2] is a bottom view from the inside in Fig. 1 (b).

In FIGS. 1 and 2, reference numeral 1 is an outer shell of a heating and cooking apparatus, 2 is a heating chamber, and 3 is a heating means such as a magnetron. Reference numeral 4 is food, 5 is a food placing table, 6 is an infrared sensor, and 7 is a case for accommodating the infrared sensor and other mechanical parts. Reference numeral 8 is a small hole provided on the ceiling surface of the heating chamber, and as shown by a broken line, infrared rays are guided to the sensor through this small hole. 9 is a shutter disk, 10 is a motor for driving the shutter disk, 11 is a protective disk, 12
Is an intermediate gear. Reference numeral 13 denotes a plurality of pins implanted in the intermediate gear, and 14 denotes an arm for driving the pins, which is fixed to the shutter disk 9. Reference numeral 15 is an internal gear provided on the edge of the protective disk 11, 16 is an infrared transparent portion of the shutter disk 9, and 17 is an infrared non-transparent portion of the shutter disk 9.

Next, the operation and action will be described. First, the infrared sensor 6 has a response speed. The number of rotations of the shutter disk 9 is set so that the infrared transmission part 16 and the infrared non-transmission part 17 of the shutter disk 9 alternately pass through the detection part of the infrared sensor 6 to a degree below the response speed.

In the present embodiment, the circumference of the shutter disk 9 is set to 8
The infrared ray transmitting portions 16 and the infrared ray non-transmitting portions 17 of the polyester resin were alternately provided by equally dividing them.

Now, the speed of passing the sensor detecting portions of the infrared transmitting portion 16 and the infrared non-transmitting portion 17 is 1.5 to
If it is 2 seconds, the output rotation speed of the motor 10 is about 4 rotations per minute. Infrared sensor 6 is shutter disk 9
The temperature of the food 4 in the heating chamber and the temperature of the infrared non-transparent portion 17 on the shutter disk 9 are alternately measured through the infrared transparent portion 16 of FIG.

While the food 4 is heated and its temperature rises, the temperature of the shutter disk 9 does not rise,
The infrared sensor 6 outputs a different temperature difference every 1.5 to 2 seconds. Utilizing this, the food is heated and controlled until it reaches an optimum temperature.

As the food 4 is heated, the water, salt or oil contained therein evaporates or scatters, and these scatters are generated on the wall surface / floor surface of the heating chamber.
Dirty the ceiling. Naturally, these scattered materials enter through the small hole 8 for detecting the infrared sensor. Small hole 8 and protective disk 11
Are extremely close to each other, and therefore, scattered matter rarely further enters inside through the gap between the end surface of the small hole 8 and the protective disk 11.

In addition, if an intrusion occurs, the infrared sensor 6
Hit the shutter disk 9 before reaching. The shutter disk 9 is provided with a flange portion 9a so as to cover the sensor side as shown in FIG. 1 (b), and scattered matter is prevented by this and does not reach the sensor portion.

The scattered matter that hits the protective disk 11 adheres to the portion of the protective disk 11 facing the small hole 8 and if left alone, the infrared sensor 6 measures the temperature of the adhered material instead of the temperature of the food. As a result, the correct food temperature cannot be measured.

Therefore, the protective disk 11 must be constantly cleaned so that a new surface is directed, so the protective disk 11 is rotated at regular intervals. The rotating mechanism will be described below.

For the shutter disk 9 rotating 4 times per minute,
It is desirable that the protective disk 11 rotate as slowly as possible. As this method, a drive motor having a low output speed can be separately provided. In this case, two motors are required, which causes a space problem, and it is desirable that the protective disk drive motor has an output rotation speed of 50 to 1 / min or less per minute, which can be realized by an existing small motor. That is not realistic.

Arm 14 provided on shutter disk 9
Is a plurality of pins 13 implanted on the side surface of the intermediate gear 12.
It is so-called Geneva mechanism that pushes forward every rotation and drives it intermittently. An internal gear 15 inscribed in the intermediate gear 12 is provided near the outer edge of the protective disk 11, and the transmission of this gear causes the protective disk 11 to rotate. If the intermediate gear 12 and the internal gear 15 of the protective disk 11 are set to a ratio of 1:10 and the Geneva drive ratio is set to 1/8, the protective disk will rotate at 0.05 rpm.

[0030]

As described above, in the heating and cooking device according to the first aspect of the present invention, the protective disk and the shutter disk prevent the scattered matter from the food from reaching the infrared sensor. Therefore, the infrared sensor It is rare that the detection part of is polluted and the detection sensitivity is lowered.

Further, since the protective disk is driven to rotate extremely slowly and intermittently, it is possible to always bring a new uncleaned portion to the position facing the small hole, and the sensor detection level is initially set for a long period of time. The same can be maintained at the time.

Further, an internal gear is formed near the outer circumference of the infrared transmitting material of the protective disk, and an intermediate gear meshing with the internal gear is provided inside the shutter disk so that the intermediate disk is intermittently rotated by an intermittent drive mechanism. Since the protective disk is arranged to be rotationally driven by the rotational driving force of the shutter disk, the drive motor may be one motor that drives the shutter disk, and the mechanical members may be thin. It is possible, simple and reliable in operation, and can be manufactured in a small size and at a low cost as a whole.

[Brief description of drawings]

FIG. 1 (a) is a sectional view of a main configuration of a heating and cooking apparatus according to an embodiment of the present invention.

FIG. 2 is a bottom view from the inside of the infrared sensor portion of the heating and cooking device.

[Explanation of symbols]

2 heating chambers 4 food 6 infrared sensor 8 small holes 9 shutter disk 11 protective disk 12 Intermediate gear 13 pin 14 Drive arm 15 Internal gear 16 Infrared transparent part 17 Infrared non-transmissive part

Claims (3)

(57) [Claims] 1. An infrared sensor for detecting the temperature of food,
A small hole provided on the ceiling surface or wall surface of the heating chamber for guiding infrared rays emitted from the food to the infrared sensor section, a shutter disk having an infrared transmitting section and an infrared non-transmitting section alternately, and formed of an infrared transmitting material Consisting of a protective disk for preventing dirt from scattered objects, the shutter disk is arranged and rotated at an appropriate position between the infrared sensor and food, and the temperature of the food is measured through the infrared transmitting part. Also, the infrared non-transmissive portion is measured to measure the temperature of the non-heated portion, and the protective disc is disposed closer to the food than the shutter disc and close to the small hole of the heating chamber. Cooking equipment that did. 2. The protective disk has a very large area compared to the area of the small holes provided on the ceiling surface or wall surface of the heating chamber, and is much slower than the rotation speed of the shutter disk.
Alternatively, the heating and cooking device according to claim 1, which is adapted to rotate intermittently. 3. An internal gear is formed on the outer circumference of an infrared transmitting material of a protective disk, and an intermediate gear meshing with the internal gear is provided inside the internal gear.
The cooking according to claim 1 or 2, wherein the shutter disk is arranged so as to intermittently rotate the intermediate gear by an intermittent drive mechanism, and the protective disk is rotationally driven by the rotational driving force of the shutter disk. apparatus.