JPS6224955Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a high-frequency heating device with an improved infrared condensing structure.

Generally, high-frequency heating devices such as microwave ovens detect the heating temperature of food and control the heating based on the detected temperature, but the conventional detection method is to insert a probe into the food and check the temperature. What it detects is known.

However, when detecting temperature using a probe, a hole is formed in the food, causing the food to lose its shape, and since the probe is inserted into the food, there is an inconvenience that the user feels unsanitary.

Therefore, in recent years, methods have been developed for detecting the temperature of foods without coming into contact with them using non-contact temperature sensing elements such as infrared sensors.

However, temperature-sensitive elements such as infrared sensors have low sensitivity and cannot satisfactorily detect the heating temperature of food unless infrared rays from the food are focused.

Therefore, in the past, infrared rays have been focused using infrared lenses made of, for example, germanium or silicon.

However, infrared lenses are expensive and have become extremely uneconomical.

This invention was made with attention to the above circumstances,
The purpose is to provide a high-frequency heating device that can collect infrared rays without using an infrared lens.

Hereinafter, one embodiment of the present invention will be described based on the drawings. In the figure, reference numeral 1 denotes a main body of a microwave oven, and an operating section 2 is provided on one side of the main body 1, and a door body 4 for opening and closing an oven chamber 3 is provided on the other side.
Additionally, a mounting shelf 4a is provided at the inner bottom of the oven chamber 3.
is provided, and food 5 is placed on this shelf 4a. Further, a light condensing recess 6 is formed in a substantially central portion of the ceiling of the oven chamber 3, with a part of the ceiling wall protruding upward in a curved manner, and the central portion of the light condensing recess 6 is A detection port 7 is bored in the hole.
Further, a sensor cover 8 is attached to the ceiling of the oven chamber 3 so as to face the light condensing recess 6. This sensor cover 8 is constructed as shown in FIG. It is installed by fitting into 10. The circumferential side of the sensor cover 8 is constituted by a transparent film 11 made of, for example, polyethylene and is transparent to radio waves, and a reflecting mirror 12 is provided at the inner bottom facing the detection port 7 . That is, the detection port 7 is optically isolated from the interior space of the heating chamber 3 by the sensor cover 8.

On the other hand, a detection port 7 is located above the condensing recess 6.
An infrared sensor 13 is provided opposite to the infrared sensor 13, and a chopper 14 is provided between the infrared sensor 13 and the detection port 7.

Thus, in the above-described configuration, when the operating section 2 is operated to oscillate microwaves, the microwaves are introduced into the heating chamber 3 and the food 5 is heated. As a result of this heating, infrared rays a are irradiated from the food 5 as shown by arrows in FIG. 2, and after passing through the sensor cover 8, are reflected by the inner circumferential surface of the condensing recess 6 and condensed. Then, this focused infrared light is reflected by the reflection mirror 12 and guided to the infrared sensor 13 via the detection port 7. As a result, the temperature of the food 5 is detected, and the heating of the food 5 is controlled based on the detected temperature.

As described above, since the condensing recess 6 is provided in the ceiling of the heating chamber 3, infrared rays can be condensed without using an expensive infrared lens as in the conventional case. In addition, since the condensing recess 6 is formed by protruding a part of the ceiling wall of the heating chamber 3, the structure is simpler than when concentrating infrared rays using separate parts such as an infrared lens or a concave mirror. Furthermore, since the detection port 7 is optically closed by the sensor cover 8, the vapor generated when the heated object is heated can be detected without blocking the transmission of infrared rays. etc. can be prevented from coming out of the heating chamber 3 through the detection port 7.

As explained above, the present invention forms a curved condensing recess in the ceiling of the heating chamber by making a part of the ceiling wall protrude upward, and the object to be heated is The infrared rays from the sensor are focused and guided by a reflective member to the infrared sensor placed opposite the detection port formed in the recess, so there is no need to use an expensive infrared lens like in the past. Costs can be significantly reduced in comparison. In addition, since the condensing recess is formed by protruding a part of the ceiling wall of the heating chamber, the number of parts can be reduced compared to when concentrating infrared light using a separate infrared lens or concave mirror. . Furthermore, since the detection port is closed by an optically transparent sensor cover, steam generated when the object to be heated is heated is prevented from escaping from the detection port to the outside of the heating chamber. Ru.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a front view of the microwave oven with the door open;
FIG. 2 is a longitudinal sectional front view showing the main parts, and FIG. 3 is a perspective view showing the sensor cover. 5... Heated object, a...,... Infrared rays, 3... Heating chamber, 7... Detection port, 13... Infrared sensor, 6...
...Recess for condensing light, 12 ₁ ...Reflection member.

Claims (1)

[Scope of utility model registration request] A light condensing recess formed in the ceiling of the heating chamber with a part of the ceiling wall projecting upward, and a peripheral wall attached to the inner surface of the ceiling opposite to the light condensing recess to be heated. A sensor cover formed of a transparent film that transmits infrared rays emitted from the object; and a sensor cover provided within the sensor cover at a position where the infrared rays emitted from the object to be heated are focused by the condensing recess. a detection port formed in the condensing recess for guiding infrared rays reflected by the reflecting member to the outside of the heating chamber; and a detection port disposed opposite to the detection port to guide infrared rays from the reflecting member A high-frequency heating device comprising: an infrared sensor for detecting the temperature of the object to be heated.