JPH0533343B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a polarization-type egg checking device that optically detects the state in which egg yolk is mixed into the egg white after breaking the egg.

BACKGROUND ART Eggs are often used as a raw material in the food manufacturing industry, which manufactures confectionery, mayonnaise, dressings, etc. Eggs used as raw materials for these foods are roughly classified into three types depending on the form of use: those that use only egg yolk, those that use only egg white, and those that use egg yolk and egg white. In order to use eggs in the former two ways, it is necessary to separate the cracked eggs into yolks and whites. Currently, this separation process is automated using a separate type egg breaking machine, but the egg yolk and egg white are not completely separated during this separation process, and the yolk may get mixed into the egg white. Since such egg white is a defective product for raw materials consisting only of egg whites, it is necessary to remove it before mixing it into raw materials consisting only of egg whites. Removal of egg white mixed with egg yolk has traditionally been carried out by workers visually monitoring the process, but since this method relies on human judgment, it speeds up the egg-breaking process. It was difficult. Even though egg breaking machines with the ability to break 600 eggs per minute have already been developed, the human eye's ability to distinguish egg whites mixed with egg yolk is limited to 300 to 400 eggs per minute, based on experience. Therefore, it was difficult to utilize the capabilities of the egg breaking machine.

Against this background, egg checking devices using polarized light are being considered in order to automate the detection of egg yolk contamination. The configuration and measurement principle of such an apparatus will be explained with reference to FIG. 6. 1 is a polarized light source section consisting of a light source 11, a lens 13, and a polarizer 12, 2 is a sample albumen, 3 is an analyzer, and 40 is a detector. Detection means 32 converts the emitted light into an electrical signal, and 32 is a determination section that receives the electrical signal and determines whether or not egg yolk is mixed. Note that the portion indicated by the dotted line relates to the device described later. Here, for convenience of explanation, the polarizer 12
is set to transmit only linearly polarized light having an oscillating component of the electric field perpendicular to the light incident plane (plane of paper), and the analyzer 3 is set at 90 degrees to the oscillating direction of the linearly polarized light. It is assumed that the setting is made so that only linearly polarized light beams with a shifted vibration direction, that is, linearly polarized light beams having a vibration component parallel to the incident plane, are transmitted. The polarizer 12 and the analyzer 3 may be set to pass polarized light with vibration components shifted by 90 degrees from each other, and the incident polarized light does not necessarily have to be perpendicular to the plane of incidence. If you set it like this,
First, a light beam from a light source 11 passes through a polarizer 12 to become linearly polarized light whose vibration direction is perpendicular to the plane of incidence, and enters the sample albumen 2 where it is scattered and reflected. When measurements are performed without the influence of disturbance light, the incident linearly polarized light source is scattered and reflected, and the polarization is partially canceled, resulting in polarized light whose vibration direction is parallel to the plane of incidence in the scattered reflected light. The reflected light is detected by the detection means 40 only when it is included. Here, egg yolk has a strong property of scattering and reflecting light, and also has a property of reflecting polarized light, almost eliminating polarization. On the other hand, since egg white is transparent, it has a weak property of scattering and reflecting light, and does not have the property of depolarizing polarized light when it is reflected. Therefore, when the sample egg is only the albumen, the linearly polarized light rays irradiated to the albumen are not scattered and reflected very much, and the polarization is not canceled much, so the number of rays passing through the analyzer 3 is small, while the sample egg When the egg is a disordered egg with yolk mixed in, many of the rays pass through the analyzer 3 because the yolk scatters and reflects the irradiated linearly polarized light well and eliminates the polarization well. In this way, since the amount of reflected light differs depending on whether egg yolk is mixed in or not, it is possible to determine whether egg yolk is mixed in or not. Specifically, the determination section 32 makes the determination based on the output signal from the detection means 40.

By the way, when eggs are broken using an egg-breaking machine, part of the eggshell often gets mixed into the egg white, but since the eggshell is white, it has the property of scattering and reflecting light more than the yolk, and also canceling polarization. There is. For this reason, egg yolk and egg shell give similar detection outputs and cannot be distinguished, so even if a very small amount of egg shell is mixed into the egg white, it will be mistakenly detected as egg yolk.

Therefore, the present inventor proposed the following device in order to distinguish between egg yolk and egg shell (Japanese Patent Application No. 1983-
No. 187782 (Unexamined Japanese Patent Publication No. 60-79249). This proposed device scatters and reflects light over the entire visible wavelength range (400 to 700 nm) because the egg shell is white, but the egg yolk is yellow, so as shown in Figure 7.
It was developed with a focus on absorbing light in the range of 400 to 500 nm, and includes a first detection part that has light receiving sensitivity within the wavelength range of light absorbed by egg yolk, and a detection part that has light reception sensitivity within the wavelength range of light absorbed by egg yolk. The detection means includes a second detection section having light receiving sensitivity within a visible light wavelength range excluding the wavelength range of visible light. For example, as shown in FIG. 8, the light receiving sensitivity characteristic of the first detecting section is a characteristic indicated by A, and the light receiving sensitivity characteristic of the second detecting section is a characteristic indicated by B. In the first detection section having the light receiving sensitivity characteristic shown by A in FIG.
Since it only detects light in the wavelength range of 500 nm, a white egg shell will scatter and reflect light over the entire visible wavelength range of 400 to 700 nm, so the reflected light can be detected, but egg yolks cannot. Since it absorbs light in the wavelength range of 400 to 500 nm, its reflected light is not detected. On the other hand, the second one having the light receiving sensitivity characteristic shown in B
The detection section detects both reflected lights because there is no absorption peak in the wavelength range of 530 to 700 nm.
Specifically, the first detection section and the second detection section include a beam splitter 31 as a component of the detection means 40, as shown by dotted line sections 4A and 4B in FIG.
It is incorporated at the rear of the . Although not shown in FIG. 6, the determination unit 32 includes a comparison unit that compares the output signal of the first detection unit with a predetermined threshold, and a comparison unit that compares the output signal of the second detection unit with a predetermined threshold. A comparison section etc. that compare the values are incorporated.

In such a device, when nothing is mixed in the egg white, the output signals of both the first detection section and the second detection section are very small, and when the egg yolk is mixed, the output signal of the first detection section and the second detection section is very small. The output signal of the first detection part is very small, and the output signal of the second detection part has a value proportional to the amount of egg yolk mixed in. If eggshell is mixed in, the output signal of the first detection part and the second detection part are For example, any output signal of the section is proportional to the size of the eggshell. 9th
The figure is a graph showing an actual measurement example of the output signal of the second detection section, and FIG. 10 is a graph showing an actual measurement example of the output signal of the first detection section. As can be seen from this graph, if the output signal of the second detection section exceeds the set value BS1, it means that egg yolk or egg shell is mixed in the egg white, and in this case, the output signal of the first detection section If the signal is above the set value AS1, eggshells are mixed in.
If it is lower than the set value AS1, it can be seen that egg yolk is mixed. That is, if the output signal of the first detection section is the a signal and the output signal of the second detection section is the b signal, (a) If the b signal < BS1, only the egg white (b) The b signal > BS1 and the a signal < AS1 Then, there is egg yolk contamination (c). If signal b > BS1 and signal a > AS1, then eggshell contamination occurs. If the albumen corresponding to condition (b) is detected and removed, the contamination of egg yolk into the egg white can be confirmed. It can be prevented.

Problems to be Solved by the Invention The outline of the proposed device has been described above, but this device has the following drawbacks. 9th
The state of the albumen shown as a whole egg in Figures and Figure 10 is as follows:
As shown in FIGS. 11A and 11B, the entire surface of the egg white is covered with egg yolk, and there is a very large amount of yolk mixed in. In the case of whole eggs, this can be detected by the above-mentioned device. However, as shown in Figure 12 A and B, the vitelline membrane is not broken and the whole egg yolk is mixed into the albumen (hereinafter referred to as the "egg state").
In this case, the output signal of the first detection section is lower than the set value AS1, as shown in Figure 10, because the yolk surface is raised and the vitelline membrane has absorption wavelength characteristics that are slightly different from those of the yolk. It becomes a high value.
Therefore, as it is, it will be judged as an egg shell. In order to prevent this, if the setting value is raised to AS2, the egg condition will be judged as egg white mixed with egg yolk, but if a small egg shell of 5 to 10 φ is mixed in, it will also be judged as egg yolk mixed in, so the egg white will be judged as mixed egg white. The recovery rate will deteriorate.

Furthermore, as shown in Figure 13 A and B, when egg yolk and egg shell are mixed at the same time, their reflection characteristics overlap and the output signal of the first detection section exceeds the set value AS1, so it is determined as egg shell. You will end up being rejected.

The present invention has been made based on the above circumstances, and it is an object of the present invention to provide an egg checking device that can automatically and reliably detect the mixing of egg yolk into egg white.

Means for Solving the Problems The present invention provides a polarized light source section for irradiating a linearly polarized light beam onto the moving egg white after breaking, and a polarized light source section that irradiates the moving egg white with a linearly polarized light beam, and the reflected light from the egg white due to the irradiation of the light beam from the polarized light source section. A detector that transmits the reflected light, a beam splitter that splits the light beam that has passed through the detector into two, and a light-receiving sensitivity within the wavelength range of the light that is absorbed by the egg yolk.
a first detection unit that receives one of the light beams separated by the beam splitter and converts it into an electrical signal; , a second detection unit that receives the other beam split by the beam splitter and converts it into an electrical signal; and a second detection unit that receives the other beam split by the beam splitter and converts it into an electrical signal; a setting section that sets a signal x ₁ that is slightly larger than the output signal of the first detection section; and a setting section that sets a signal x ₂ that is slightly larger than the output signal of the first detection section when the egg condition is measured. and a setting section for setting a signal _y1 that is slightly larger than the output signal of the second detection section when only the egg white is measured, and a setting section that sets the signal y1 that is slightly smaller than the output signal of the second detection section when measuring a large egg yolk. A setting section for setting the signal y ₂ and a pattern of output signals from the first detection section and the second detection section corresponding to the movement of the egg white are input, and the output signal of the first detection section becomes the setting signal x ₁ . and _x2 , and also determine which of the areas divided by setting signals _y1 and _y2 the output signal of the second detection section belongs to, and make that determination. and a determination section that determines whether or not egg yolk is mixed into egg white based on the results.

Effect Output signal from the second detection section (hereinafter referred to as "signal b")
That's what it means. ) is smaller than y ₁ at any position, it is determined that there is only egg white. signal b
If exceeds y ₁ at any position, determine as follows. When the output signal from the first detection unit (hereinafter referred to as "signal a") is smaller than x ₁ at any position, it is determined that egg yolk is mixed, and at the position where signal b exceeds y ₁ , it is determined that egg yolk is mixed. signal a
If there are parts where x exceeds x ₁ and parts where it does not, it is determined that eggshell and egg yolk are mixed in, and signal b exceeds y ₂ and signal a is smaller than x ₂ at that position. Sometimes, it is determined that the whole egg is an egg with the whole yolk mixed into the egg white. Also signal b
Even if exceeds y ₁ at any position, the signal b
If is between y ₁ and y ₂ and signal a exceeds x ₁ , or if signal b exceeds y ₂ and signal a exceeds x ₂ , it is eggshell contamination. It is determined that

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

FIG. 1 is a block diagram showing the configuration of an egg checking device according to an embodiment of the present invention, and the same reference numerals as in FIG. 6 indicate corresponding parts. The detection means 40 includes a condensing lens 30, a beam splitter 31, and a first detection section 4A and a second detection section that respectively detect the two light beams separated by the beam splitter 31 and convert them into electrical signals. Consists of 4B. Here analyzer 3
is 90 with respect to the vibration direction of the light beam from the polarizer 12.
It is set so that only light rays in the vibration direction that are shifted by a certain degree are transmitted. The first detection section 4A is composed of an optical filter 41A, a light receiving element 42A that converts the light beam from the optical filter 41A into an electric signal, and an amplifier 43A. 4
The light-receiving sensitivity characteristics of A are as shown by A in FIG. 8 as a whole. Therefore, the first detection section 4A detects light in the wavelength range of 400 to 500 nm. The second detection section 4B is similarly composed of an optical filter 41B, a light receiving element 42B, and an amplifier 43B, and the overall light receiving sensitivity characteristic is as shown by B in FIG. 8. Therefore, the second detection section 4B detects light in the wavelength range of 530 to 700 nm. Reference numeral 6 denotes a determination section, which includes A/D converters 7A, 7B and a microcomputer 8. Reference numerals 81 to 85 are setting units, and the setting unit 81 sets a signal AS1 that is slightly larger than the signal a when measuring egg white mixed with egg yolk other than a state where the whole egg yolk is included in the egg white. A signal AS2 is set which is slightly larger than the signal a when measuring the egg state. Setting section 8
3 sets the signal BS1 which is slightly larger than the signal b when only the egg white is measured, and the setting section 84 sets the signal BS1.
The setting unit 85 sets a signal BS2 between the signal b and the signal BS3 described below, and the setting unit 85 sets a signal BS3 that is slightly smaller than the signal b when measuring a large egg yolk.
Examples of the levels of these setting signals AS1, AS2, BS1, and BS3 are shown in FIGS. 9 and 10. In such an embodiment, the signal a and the signal b are transmitted from the first detection section 4A and the second detection section 4B.
are output as analog signals, and these signals are converted into digital signals by A/D converters 7A and 7B and input to the microcomputer 8. On the other hand, setting signals AS1, AS2,
BS1, BS2, BS3 are microcomputer 8
In this microcomputer 8, for example, according to a program described later, the presence or absence of egg yolk contamination with the egg white is determined based on the pattern corresponding to the temporal change of signals a and b, and when the contamination of the egg yolk is detected. Outputs egg yolk contamination detection signal. Note that as the determination section 6, a combination of an analog circuit and a comparator circuit can also be used.

The reason why the setting unit 84 sets the signal BS2 is as follows. That is, in this embodiment, for example, a halogen lamp is used in the polarized light source section 1, so the amount of light in the wavelength range of 400 to 500 nm, which corresponds to characteristic A in FIG. However, since the degree of amplification must be increased, the rise of the output of the first detection section 4A is slower than the rise of the output of the second detection section 4B. Therefore, for example, if only egg shells are mixed in, signal b will be BS.
At the time when the signal a exceeds 1, the signal a may not yet exceed AS1, and if the judgment is made based on the comparison result at this point, it will be judged as egg yolk.
In order to avoid this, BS2 was determined empirically and used as the setting signal.

Microcomputer 8 included in determination unit 6
inputs the pattern of signal a and signal b corresponding to the movement of the egg white, and signal a corresponds to the setting signals AS1 and AS.
It is determined which of the areas divided by
It is determined which of the regions divided by 3 belongs to, and based on the determination result, it is determined whether or not egg yolk is mixed into the egg white. FIG. 2 is a diagram showing patterns of signal a and signal b corresponding to the state of the egg white after breaking. In order to determine each state of the egg white shown in FIG. 2, the determining section 6 may be provided with the following functions.

(a) If it is determined that the signal b<BS1 throughout the cup, there is no contaminant in the egg white, so it is determined that there is no contamination in the egg yolk.

(b) If it is determined that signal b>BS1 at any position and the maximum value of signal a during that time is smaller than AS1, egg yolk is mixed in, so it is determined that egg yolk is mixed.

(c) If it is determined that signal b > BS1 at any position and the maximum value of signal a during that time is greater than AS1, the egg shell is Since only egg yolk is mixed in, it is determined that there is no egg yolk mixed in.

(d) If it is determined that signal b>BS3 and signal a becomes smaller than AS2 even for a moment during that time, it is determined that egg yolk is mixed in, since it is a broken egg or a large egg yolk.

(e) If it is determined that BS2<signal b<BS3 and during that time signal a becomes smaller than AS1 even momentarily, it is egg yolk contamination, so it is determined that egg yolk is present.

As in the judgments (d) and (e) above, even momentary signals a
If the value becomes smaller than AS1 or AS2, it is assumed that the egg yolk is mixed in. If the egg yolk and shell are mixed at the same time, even if the maximum value of signal a exceeds AS1 or AS2, it will not occur somewhere in the pattern. This is to ensure that conditions (d) and (e) are met, and that contamination with egg yolk can be detected reliably.

Here, the structure of the egg breaking machine 5 will be briefly explained with reference to FIGS. 3 and 4. An egg is placed on the uppermost arm 51, and a crack is made from below by a two-blade knife 52. The egg is broken by opening the knife 52 into two. And the upper cup 5
The contents fall into the cup 53, but this cup 53 has a small hole or cut, and only the egg white falls into the cup 54 at the bottom.
It is starting to fall and be separated. If the vitelline membrane ruptures during egg-breaking, the yolk drips into the lower cup 54, and depending on the timing of the egg-breaking or the condition of the yolk, the entire yolk may enter the lower cup 54. It may fall and turn into an egg. Pieces of the eggshell may also fall into the upper and lower cups. The egg breaking machine is equipped with dozens of egg breaking units as described above, and while always moving in a fixed direction, the machine feeds eggs, breaks eggs, separates eggs, and discharges eggshells, yolks, and whites. is repeated.
Therefore, if the egg checking device is installed at the position where the egg white has finished falling into the lower cup 54 after the egg is broken, the cups of albumen will pass in front of the egg checking device one after another. The signals a and b at this time show a pattern as shown in FIG. 2, corresponding to the state of the egg white.

Next, an example of a flowchart of the microcomputer will be explained with reference to FIG.

(1) When starting measurement, first BS1, BS3, BS3,
Each set value of AS1 and AS2 is input and stored in the memory.

(2) Next, signal b is input, and a comparison of signal b>BS1 is performed. The operation of inputting and comparing signal b continues until signal b exceeds BS1. In other words, as long as the condition of signal b>BS1 is not satisfied, there will be no contaminants in the egg white.
There is no need to proceed to the next determination operation.

(3) If the condition of signal b > BS1 is satisfied, it means that egg yolk or egg shell has been mixed into the egg white, so proceed to the next step. First, in order to find the maximum value a _ax of signal a, A small signal a, 0, is set as the initial value of _anax .

(4) Next, input signal a and judge whether both conditions of signal b>BS2 and signal a<AS1 are satisfied at the same time.If the conditions are satisfied, egg yolk is mixed in, so the egg yolk contamination detection signal is sent. Set the buffer for the output side. This condition may be satisfied if a large egg yolk is mixed in, or if egg yolk and egg shell are mixed in at the same time.

(5) In the next step, it is determined whether both conditions of signal b>BS3 and signal a<AS2 are satisfied. When the conditions are satisfied, it means that eggs are mixed in, so a buffer for the egg yolk mixture detection signal is set on the output side.

(6) The next step is to find the maximum value a _nax of the signal a. Compare the current signal a with the value stored in the memory a _nax , and store the larger value as a _nax in the memory a _nax . By repeating this operation several times through the loop from stepx to stepx', at the time the loop exits, the maximum value of the signal a that has been input up to that point will be
a This means that it is in the _NAX memory.

(7) In the next step, input signal b, and signal b<
Determine whether the conditions of BS1 are satisfied.
If this condition is not satisfied, it means that the egg yolk or egg shell mixed in the egg white has not passed completely in front of the detection unit, so the above loop is repeated to determine whether egg yolk is mixed. When the mixed egg yolk or eggshell has passed in front of the detection section, the condition of signal b<BS1 is satisfied, and the process exits from the loop and proceeds to the next step.

(8) In the next step, it is determined whether the condition of a _nax <AS1 is satisfied, and if it is satisfied, a buffer for the egg yolk contamination detection signal is set on the output side.

(9) Check the status of the buffer for the egg yolk contamination detection signal in the last step, and if it is set to the output side, clear the buffer after outputting the egg yolk contamination detection signal to the outside. Next, return to step y of the flowchart and proceed to the next measurement. When the buffer is not set on the output side, the contaminant is eggshell, so do nothing and return to step y to proceed to the next measurement.

According to such a program, the state of the albumen shown in FIG. 2 can be determined by repeating the loop from step x to step x' while the sample passes in front of the detection means 40.

Next, a specific method of determining each set value in the setting units 81 to 85 will be described.

(1) First, BS1 is determined to be a value that is very slightly larger than the maximum value of signal b when the second detection unit 4B measures egg white. When measuring egg white, signal b should not exceed BS1, but if BS1 is set too high, the condition of signal b > BS1 will not be satisfied when small egg yolks or shells are mixed in, so BS1
uses a signal value slightly higher than the value of signal b when detecting egg white.

(2) It has been experimentally found that a good detection state can be obtained for BS2 by using a value between BS1×1.5 and BS1×2.5.

(3) For BS3, the egg is measured many times and the value of the smallest signal b at that time is used, but it has been experimentally found that this value is about BS1×3 to BS1×4.

(4) For AS1, use a value that is very slightly larger than the value of signal a when measuring all egg whites mixed with egg yolks, except for eggshells and eggs. That is, AS1 is determined so that the value of the signal a of all egg whites mixed with egg yolks, excluding those mixed with eggshells and eggs, satisfies the condition of signal a<AS1. but,
If AS1 is set too high, the signal a when a small eggshell is detected will also be smaller than AS1, resulting in false detection, so it cannot be set too high.

(5) AS2 shall be a value slightly higher than the maximum value of the A signal value when measuring eggs. Experimentally,
Using a value between AS1×2 and AS1×3 will result in a good detection state.

Effects of the Invention As described above, in the present invention, since the presence or absence of egg yolk contamination is determined using an optical method, the detection of egg yolk contamination can be automated and the detection speed is high. Compared to the case where the judgment is made visually, it is possible to increase the speed of the line and improve work efficiency. Furthermore, we focused on the fact that the eggshell reflects all visible light, while the yolk absorbs specific wavelengths, and we developed a first detection section that has light-receiving sensitivity within the wavelength range of the light that the egg yolk absorbs. A second detection section having light receiving sensitivity within the visible light wavelength range excluding the wavelength range is provided, and as described in the section of means for solving the problem, setting signals x ₁ , x ₂ ,
y ₁ , y ₂ (in the example, AS1, AS2, BS1,
BS3) is introduced, and it is determined to which region the output signal of the first detection section belongs to the setting signals x ₁ and x ₂ , and the output signal of the second detection section is determined as the setting signal. It is determined which of the regions divided by y ₁ and y ₂ the egg belongs to, and based on the determination result, it is determined whether or not the egg yolk is mixed into the egg white, so it is possible to reliably distinguish between the egg yolk and the egg shell. In addition, there is no risk of mistakenly identifying eggshell contamination as egg yolk contamination, and even if egg yolk and eggshell are mixed in the egg white at the same time, or if the whole egg yolk is mixed in, it can be detected as egg yolk contamination. As a result, contamination of egg yolk into egg white can be reliably detected, and the yield of egg white is improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram showing patterns of output signals of the first detecting section and the second detecting section corresponding to the state of egg white, and FIG. Fig. 4 is a side view and a front view of the egg breaking machine, Fig. 5 is a flowchart showing an example of a flowchart of a microcomputer, Fig. 6 is a configuration diagram showing a conventional egg checking device, and Fig. 7 is a A graph showing an example of the absorption spectrum of an egg yolk. Fig. 8 is a graph showing an example of the light-receiving sensitivity characteristics of the detection unit. Fig. 9 shows the relationship between the output signal of the second detection unit and the sizes of the egg yolk and eggshell. 10 is a graph showing the relationship between the output signal of the first detection unit and the size of the egg yolk and eggshell; FIGS. 13A and 13B are a plan view and a side view, respectively, showing a state where the egg yolk and shell are mixed in the egg white. 1... Polarized light source section, 2... Sample egg white, 3... Analyzer,
31... Beam splitter, 4A... First detection section,
4B...Second detection unit, 6...Determination unit, 8...Microcomputer, 81-85...Setting unit.

Claims (1)

[Claims] 1. A polarized light source section for irradiating a linearly polarized light beam onto the moving egg white after breaking, an analyzer that transmits the reflected light reflected from the albumen by the irradiation of the light beam from this polarized light source section, and this analyzer. A beam splitter that splits the light beam that has passed through the analyzer into two; and a beam splitter that has a light receiving sensitivity within the wavelength range of the light that is absorbed by the egg yolk, and that receives one of the light beams split by the beam splitter and generates an electrical signal. a first detection unit that converts the light beam into a light beam, and has a light receiving sensitivity within the visible light wavelength range excluding the wavelength range of light absorbed by the egg yolk, and receives the other light beam split by the beam splitter and generates an electrical signal. and a signal that is slightly larger than the output signal of the first detection unit when measuring egg white mixed with egg yolk other than the egg state where the whole egg yolk is contained in the egg white.
x ₁ , a setting section that sets a signal x 2 that is slightly larger than the output signal of the first detection section when measuring the egg white state, and a second signal x ₂ when measuring only the egg white. A setting section sets a signal y ₁ that is slightly larger than the output signal of the detection section, a setting section that sets a signal y 2 that is slightly smaller than the output signal of the second detection section when measuring a large egg yolk, and a setting section that sets a signal y ₂ that is slightly smaller than the output signal of the second detection section when measuring a large egg yolk. Input the patterns of the output signals from the first detection section and the second detection section corresponding to the movement, and determine which of the regions the output signal of the first detection section belongs to divided by the setting signals x ₁ and x ₂ . At the same time, it is determined which of the regions divided by the setting signals _y1 and _y2 the output signal of the second detection section belongs to, and based on the determination result, it is determined whether or not egg yolk is mixed into the egg white. 1. An egg checking device comprising: a determination section that makes a determination.