JP5341434B2 - Incubator - Google Patents

Description

  The present invention relates to a culture apparatus.

  For example, there is a culture apparatus for culturing a culture such as cells and microorganisms in a culture chamber. The culture apparatus includes a housing in which the culture chamber is formed, a door that seals the culture chamber, and an ultraviolet lamp that generates ultraviolet rays for sterilizing the air in the culture chamber. Each time it is detected that the door is sealed, the ultraviolet lamp is lit for a predetermined time.

  The ultraviolet lamp also sterilizes humidified water in a humidifying tray placed on the bottom of the culture chamber, for example. In addition, as a means for detecting that the culture chamber is sealed by the door, for example, a micro switch configured to be turned off when the door is open and turned on when the door is closed Etc. are used.

  The operation of sealing the culture chamber with the door is performed, for example, after the user opens the door and removes the culture from the culture chamber or after putting the culture into the culture chamber, and the ultraviolet lamp is lit for a predetermined time each time. . As a result, the air in the culture chamber, the humidified water, and the like contaminated with germs in the atmosphere by opening the culture chamber are sterilized.

In addition, the irradiation time of the ultraviolet rays from the ultraviolet lamp for sterilizing various bacteria is experimentally determined in advance, and the predetermined time for lighting the ultraviolet lamp once is set based on, for example, the experimental result. .
JP 2000-166536 A

  By the way, in the culture apparatus having the above-described configuration, as the operation of opening and closing the door of the culture chamber is repeated, the irradiation output of the ultraviolet lamp decreases due to repeated irradiation of the ultraviolet lamp. In other words, since the irradiation output of the ultraviolet lamp gradually decreases according to the lighting time (aging characteristics), the ultraviolet ray sterilization effect generated by the ultraviolet lamp per predetermined time (that is, the sterilization ability of the ultraviolet lamp) is the use of this ultraviolet lamp. Decreases according to the number of times.

  For this reason, as the number of uses increases, sterilization in the culture chamber by ultraviolet rays from an ultraviolet lamp becomes insufficient with irradiation for the same time. That is, the effect of sterilizing the ultraviolet lamp accompanying the sealing of the culture chamber by the door is reduced. In this case, for example, miscellaneous bacteria remaining without being sterilized in the culture chamber may grow and contaminate the culture.

  The invention for solving the above problems includes a housing in which a culture chamber for culturing a culture is formed, a door for sealing the culture chamber, and ultraviolet rays for sterilizing the air in the culture chamber. An ultraviolet lamp that is generated, a lighting device that lights the ultraviolet lamp for a predetermined time each time it is detected that the culture chamber is sealed by the door, a detection device that detects a decrease in the sterilizing ability of the ultraviolet lamp, and A culture apparatus comprising: a control device that controls the lighting device so that the predetermined time becomes longer as the sterilizing ability of the ultraviolet lamp decreases based on a detection result of the detection device.

  ADVANTAGE OF THE INVENTION According to this invention, the fall of the effect of the sterilization of the ultraviolet lamp accompanying the sealing of the culture room by a door can be suppressed.

  At least the following matters will become apparent from the description of the present specification and the accompanying drawings.

=== Configuration of the culture apparatus ===
A configuration example of the culture device 1 of the present embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 is a side cross-sectional view of an example of the culture apparatus 1 of the present embodiment. FIG. 2 is a front view of the culture apparatus 1 of FIG. FIG. 3 is a block diagram showing an example of a configuration for controlling the ultraviolet lamp 100 of the culture apparatus 1 of FIG. In FIG. 2, an outer door 3 and an inner door 4a described later are omitted for convenience of illustration.

  As illustrated in FIGS. 1 and 2, the culture apparatus 1 includes an inner box (housing) 4 and an outer box (housing) 2, an inner door (door) 4 a and an outer door (door) 3, and ultraviolet rays. And a lamp 100. The culturing apparatus 1 cultivates cultures such as cells and microorganisms in the culture chamber 4 b of the inner box 4.

  The inner box 4 is a substantially rectangular box made of, for example, stainless steel, and a culture chamber 4b is formed therein. The culture chamber 4b illustrated in the figure is partitioned in the vertical direction (Z-axis direction) by a plurality of shelves 42 made of, for example, stainless for placing the culture. The shelf 42 has a plurality of holes (not shown) penetrating in the vertical direction and is supported by, for example, a stainless steel shelf holder 41 provided in pairs on the inner surface of the inner box 4 on the ± X side. .

  The outer box 2 is made of, for example, stainless steel and has a substantially similar shape to the inner box 4, and the inner box 4 is accommodated therein in a state of being insulated from the outside air. A heat insulating material (not shown) for heat insulation is provided on the inner surface of the outer box 2. For further heat insulation, for example, air as an air circulation path is provided between the heat insulating material and the inner box 4. A jacket 6 is formed. The air jacket 6 is provided with a heater (not shown) for adjusting the temperature in the culture chamber 4b. Further, for example, a sensor (not shown) for detecting the temperature in the culture chamber 4b is injected on the outer surface of the rear side (−Y side) of the outer box 2, and a gas such as carbon dioxide is injected into the culture chamber 4b. A sensor box 7 having a nozzle (not shown), a sensor (not shown) for detecting the concentration of carbon dioxide in the culture chamber 4b, a heater (not shown), and the like is provided. The nozzles, sensors, and the like are attached from the outside of the outer box 2 through holes (not shown) drilled from the outer surface on the rear side of the outer box 2 to the inner surface on the rear side of the inner box 2, for example. Is electrically connected to, for example, a control unit 200 described later via a predetermined wiring (not shown). The outer surface of the rear side of the outer box 2 and the sensor box 7 are covered with a cover 21 having a heat insulating material (not shown) inside.

  The inner door 4a is a flat glass door made of, for example, tempered glass, which can open and close the opening on the front side (+ Y side) of the inner box 4 via a predetermined hinge (not shown). When the inner door 4a is closed with respect to the opening of the inner box 4 via a predetermined packing (not shown), the inside of the inner box 4 becomes airtight with respect to the outside.

  The outer door 3 is, for example, a metal flat door that can open and close the opening on the front side of the outer box 2 via a predetermined hinge (not shown). The outer door 3 includes a metal door body 31 provided with a heat insulating material (not shown) for heat insulation, a heater (not shown) for adjusting the temperature in the culture chamber 4b, and the like, and the door body. 31 and a packing 33 attached to the convex portion 31a facing the opening of the outer box 2. The outer door 3 further has a control panel 32 on the front side of the door body 31. The control panel 32 includes a keyboard 204 for setting the lighting time of the ultraviolet lamp 100, which will be described later, a display 203 for displaying these current values, and the like.

  As illustrated in FIGS. 1 and 2, the ultraviolet lamp 100 includes various bacteria in the air passing under the duct 43 (−Z side) and the humidified water in the humidifying tray 44 disposed under the duct 43. In order to sterilize them, they are disposed at a position where they can be irradiated with ultraviolet rays. Here, the duct 43 is composed of a wall on the rear side of the inner box 4 and a wall plate 5 made of stainless steel, and forms an air passage between them. A fan 5a (sirocco fan) is provided above the duct 43 (+ Z side).

  As illustrated in FIG. 1, the entire humidifying tray 44 described above is covered with, for example, a stainless steel cover 45 having a hole 45a on the front side. Here, in FIG. 2, the cover 45 is omitted for convenience of illustration.

  Further, as illustrated by the white arrows in FIGS. 1 and 2, the air on the shelf 42 side above the culture chamber 4b flows into the duct 43 through the suction port 51a by the rotation of the fan 5a in a certain direction, After flowing from the upper side to the lower side in the duct 43, the air flows forward on the surface of the humidified water, and the humidified air passes through the holes 45 a of the cover 45 to form an ascending air current surrounding the plurality of shelves 42. Then, the air that has risen above the culture chamber 4b flows again into the duct 43 through the suction port 51a. By such air circulation, the inside of the culture chamber 4b is maintained at, for example, a substantially uniform temperature, humidity, and gas concentration such as carbon dioxide.

In addition, the ultraviolet lamp 100 is suppressed from generating ultraviolet rays having a wavelength of 200 nm or less by, for example, an optical filter. Thus, for example, generation of ozone (O ₃ ) from a gas (air, gas such as carbon dioxide, water vapor, etc.) in the duct 43 is also suppressed. Thereby, the bad influence with respect to the culture of ozone in the culture room 4b is suppressed.

  As illustrated in FIG. 3, the culture apparatus 1 further includes a control unit 200, an outer door switch 201, a relay 202, a timer 205, a ROM 206, and a RAM 207.

  The control unit 200 includes a CPU (not shown), and performs overall control of the outer door switch 201, the relay 202, the timer 205, the ROM 206, and the RAM 207. Note that the display unit 203 and the keyboard 204 included in the control panel 32 are also controlled by the control unit 200.

  The outer door switch 201 is, for example, a micro switch provided near the periphery of the opening of the outer box 2, and is turned on when the user closes the outer door 3 with respect to the opening of the outer box 2. When 3 is opened, it is configured to be turned off.

  The relay 202 supplies or blocks power to the ultraviolet lamp 100 from a predetermined power source (not shown) by turning on or off a relay switch (not shown) in accordance with a signal from the control unit 200. . In this embodiment, supplying power to the ultraviolet lamp 100 with the relay switch turned on is referred to as “turning on the relay 202”, and the relay switch is turned off to supply power to the ultraviolet lamp 100. Cutting off the supply is referred to as “turning off relay 202”.

The timer 205 measures the lighting time of the ultraviolet lamp 100.
The ROM 206 stores a program for causing the control unit 200 to control the lighting time of the ultraviolet lamp 100 described later.
The RAM 207 stores data used for controlling the lighting time of the ultraviolet lamp 100 described later. Specifically, the RAM 207 is data indicating an initial lighting time t0 that is an initial value of the lighting time per time of the ultraviolet lamp 100, and data indicating a lighting time t1 obtained by adding a constant value to the initial value. , And data indicating the accumulated lighting time t2 of the ultraviolet lamp 100 are stored.

=== Operation of the culture device ===
An example of the operation of the culture apparatus 1 having the above-described configuration will be described with reference to FIGS. 4 and 5. FIG. 4 is a flowchart illustrating an example of a processing procedure of the control unit 200 in controlling the lighting time of the ultraviolet lamp 100 according to the present embodiment. FIG. 5 is a diagram showing the relationship between the sterilization effect of ultraviolet rays and the lighting time per time with respect to the cumulative lighting time of the ultraviolet lamp 100 of the present embodiment.

  As illustrated in FIG. 4, the control unit 200 determines whether or not the outer door 3 has changed from the closed state to the open state (S100). Specifically, the control unit 200 determines whether or not the outer door switch 201 has changed from an on state to an off state.

  When it is determined that the outer door 3 has changed from the closed state to the open state (S100: YES), the control unit 200 next determines whether or not the outer door 3 has changed from the open state to the closed state (S101). ). Specifically, the control unit 200 determines whether or not the outer door switch 201 has changed from an off state to an on state. In addition, when it determines with the outer door 3 not changing from a closed state to an open state (S100: NO), the control part 200 performs the process of step S100 again.

  When it is determined that the outer door 3 has changed from the open state to the closed state (S101: YES), the control unit 200 resets the timer 205 and starts measuring time (S102), turns on the relay 202, and turns on the ultraviolet lamp. The lighting of 100 is started (S103), the integrated lighting time t2 (integrated time) is read from the RAM 104 (S104), and the lighting time t1 (predetermined time) is obtained based on the integrated lighting time t2 (S105). In the present embodiment, the lighting time t1 of the ultraviolet lamp 100 is a fixed value (for example, 1 minute) each time the integrated lighting time t2 has elapsed, for example, 200 hours with respect to the initial lighting time t0 (for example, 5 minutes, a predetermined time). Set to a long time. Here, the lighting time t1 with respect to the integrated lighting time t2 is stored as table data (not shown) in the RAM 207, for example. In addition, when it determines with the outer door 3 not changing from the open state to the closed state (S101: NO), the control part 200 performs the process of step S101 again.

  Note that the table data described above is the data input by the control unit 200 through the keyboard 204 of the control panel 32 (a constant value (for example, 1) to be added to the initial lighting time t0 and the sections t4 and t0 of the integrated lighting time t2. Min) and the like). For example, it is preferable that the initial lighting time t0, a constant value (for example, 1 minute), etc. are set longer as the concentration of germs in the installation environment of the culture apparatus 1 is higher. Further, the above-described integrated lighting time t2 is reset to 0 through the keyboard 204 of the control panel 32 described above, for example, when the ultraviolet lamp 100 is replaced with a new one.

  That is, when a series of operations in which the outer door 3 is opened and closed is performed, the control unit 200 starts lighting the ultraviolet lamp 100 immediately after the closing operation, and the lighting time t1 is set to a predetermined lighting time t2. Each time one section t4 (a certain time, for example, 200 hours) elapses, the time is set longer by a certain value (for example, 1 minute).

The control unit 200 refers to the timer 205 and determines whether or not the time t counted in this time has reached the lighting time t1 obtained in step S105 (S106).
When it is determined that the time t of the timer 205 has reached the lighting time t1 (S106: YES), the control unit 200 turns off the relay 202 (S107), and in step S105 with respect to the integrated lighting time t2 read in step S104. The calculated lighting time t1 is added to obtain a new integrated lighting time t2 (S108), and the data in the RAM 206 is updated with the new integrated lighting time t2 (S109).

  The controller 200 determines whether or not the new accumulated lighting time t2 obtained in step S108 has reached a predetermined accumulated lighting time t3 of the ultraviolet lamp 100 (S110). If it is determined that the new accumulated lighting time t2 has reached the accumulated lighting time t3 (S110: YES), the control unit 200 notifies the user that the life of the ultraviolet lamp 100 is near, for example, through the display 203 or the like. (S111), the process of step S100 is executed again. On the other hand, when it is determined that the new accumulated lighting time t2 has not reached the accumulated lighting time t3 (S110: NO), the control unit 200 executes the process of step S100 again.

  When it is determined in step S106 described above that the time t of the timer 205 has not reached the lighting time t1 (S106: NO), the control unit 200 determines whether or not the outer door 3 has changed from the closed state to the open state. It discriminate | determines (S112). When it is determined that the outer door 3 has not changed from the closed state to the open state (S112: NO), the control unit 200 executes the process of step S106 again.

  When it is determined that the outer door 3 has changed from the closed state to the open state (S112: YES), the control unit 200 turns off the relay 202 and performs a timer at the time of step S106 with respect to the integrated lighting time t2 read in step S104. Is added to the new accumulated lighting time t2 (S114), the data in the RAM 206 is updated with this new accumulated lighting time t2 (S115), and the process of step S101 is executed again.

  That is, every time a series of operations in which the outer door 3 is opened and closed is performed, the control unit 200 turns on the ultraviolet lamp 100 for the lighting time t1 determined according to the integrated lighting time t2. However, if the outer door 3 is opened in the middle of the lighting time t1, the lighting time t up to that point is added to the integrated lighting time t2, and after the outer door 3 is closed again, the ultraviolet lamp 100 Is lit for a lighting time t1 determined according to the new integrated lighting time t2.

  In the illustration of FIG. 5, the ultraviolet germicidal effect of the ultraviolet lamp 100 decreases in a linear relationship with the integrated lighting time. Specifically, when the sterilization effect of ultraviolet rays when the cumulative lighting time is 0 hour is defined as 100%, the sterilization effect decreases linearly until it reaches 60% in 1000 hours (solid line in FIG. 5). .

  Here, the disinfection ability of the ultraviolet lamp 100 is proportional to the irradiation output of the ultraviolet lamp 100 per predetermined time (for example, 5 minutes). Since the irradiation output of the ultraviolet lamp 100 decreases as the integrated lighting time t2 becomes longer, the sterilizing ability of the ultraviolet lamp 100 decreases accordingly. On the other hand, the ultraviolet germicidal effect is proportional to the product of the irradiation output of the ultraviolet lamp 100 and its lighting time.

  As exemplified by the one-dot chain line in the staircase shape of FIG. 5, when the integrated lighting time is 0 to 200 hours, the lighting time per time is set to 5 minutes (initial lighting time) by the processing of the control unit 200 described above. When the accumulated lighting time is 200 to 400 hours, the lighting time per time is set to 6 minutes, and when the accumulated lighting time is 400 to 600 hours, the lighting time per time is set to 7 minutes. At time 600 to 800 hours, the lighting time per time is set to 8 minutes, and when the cumulative lighting time is 800 to 1000 hours, the lighting time per time is set to 9 minutes.

  That is, the lighting time per time of the ultraviolet lamp 100 is such that the absolute values of the average gradient of the staircase shape indicated by the one-dot chain line in FIG. 5 and the gradient of the linear shape indicated by the solid line in FIG. Is set to In this way, the lighting time t1 can be set based on the relationship between the cumulative lighting time t2 of the ultraviolet lamp 100 and its sterilizing ability using a simple configuration such as the timer 205.

  In this way, for the sterilization ability that decreases at a predetermined gradient with respect to the integrated lighting time, by extending the lighting time per time so as to compensate for this reduction, for example, the sawtooth-shaped dotted line in FIG. As can be seen, the sterilizing effect of the ultraviolet lamp 100 can be maintained at or above a desired capacity. Thereby, the fall of the effect of the sterilization of the ultraviolet lamp 100 accompanying the sealing of the culture chamber 4b can be suppressed, and thus contamination of the culture product due to various germs or the like entering the culture chamber 4b can be suppressed.

  In addition, as one section t4 for extending the lighting time per time is set shorter than 200 hours illustrated in FIG. 5, the sterilization effect of ultraviolet rays per section t4 illustrated by a dotted line in FIG. Since it becomes smaller, it is possible to effectively suppress the contamination of the culture due to various germs or the like that have entered the culture chamber 4b. Here, one section t4 is stored in advance in the RAM 207 as data. This section t4 can be changed by the user through the keyboard 204 of the control panel 32 described above. In this way, by setting the predetermined time for turning on the ultraviolet lamp 100 to be longer step by step for every interval t4 of the integrated lighting time, it is possible to effectively compensate for the reduced sterilizing ability of the ultraviolet lamp 100.

  In step S105 described above, the table data stored in the RAM 207 is used to obtain the lighting time t1 corresponding to the integrated lighting time t2. However, the present invention is not limited to this. For example, the lighting time based on the initial lighting time t0, the integrated lighting time t2 and its one section t4, and a constant value (for example, 1 minute) that is added to the initial lighting time t0 each time one section t4 elapses. t1 may be calculated. As an example, if the constant value is 1 minute, first, it is possible to calculate how many times (N times) t2 is t4, and then add the N minutes to t0 as the lighting time t1. .

  In the above-described embodiment, the control unit 200 controls the outer door switch 201, the relay 202, and the timer 205 to turn on the ultraviolet lamp 100 for a predetermined time by using the opening / closing of the outer door 3 as a trigger. Therefore, the control unit 200, the outer door switch 201, the relay 202, and the timer 205, and the ROM 206 that stores a predetermined program for causing the control unit 200 to execute such processing correspond to a lighting device.

  In the above-described embodiment, the control unit 200 controls the timer 205 and the RAM 207 to obtain the accumulated lighting time of the ultraviolet lamp 100, and increases the accumulated lighting time in units of, for example, 200 hours. It is detected as the degree of decrease in sterilizing ability. Therefore, the control unit 200, the timer 205, and the RAM 207, and the ROM 206 that stores a predetermined program that causes the control unit 200 to execute such processing correspond to a detection device.

  Further, in the above-described embodiment, the control unit 200 obtains the lighting time t1 corresponding to the integrated lighting time t2 based on the table data stored in the RAM 207 (step S105 in FIG. 4). Therefore, the control unit 200 and the timer 205 and the ROM 206 that stores a predetermined program for causing the control unit 200 to execute such processing correspond to the control device.

=== Other Embodiments ===
The above-described embodiment is intended to facilitate understanding of the present invention, and is not intended to limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes equivalents thereof.

  In the above-described embodiment, the decrease in the sterilizing ability of the ultraviolet lamp 100 is detected by the control unit 200, the timer 205, the ROM 206 storing the predetermined program, and the RAM 207. However, the present invention is not limited to this. .

  For example, a predetermined ultraviolet sensor (not shown) is provided in the culture chamber 4b, and the intensity of the ultraviolet light irradiated from the ultraviolet lamp 100 is detected by this, and the control unit 200 is based on the detection result of the ultraviolet sensor. The predetermined time for turning on the ultraviolet lamp 100 may be set longer as the intensity of the ultraviolet light becomes weaker. As a result, the effect of sterilization of the ultraviolet lamp 100 accompanying the sealing of the culture chamber 4b is reduced by making up for the decrease in the sterilization ability caused by the decrease in the intensity of the ultraviolet light by the extension of the predetermined time for lighting the ultraviolet lamp 100. Can be suppressed.

  Further, for example, a predetermined current measuring means (not shown) for measuring the discharge current in the ultraviolet lamp 100 is provided, and the ultraviolet lamp is based on the degree of decrease in the current value measured by the current measuring means. A decrease in sterilization capacity of 100 may be detected.

  Further, for example, a predetermined counter (not shown) for measuring the number of times the outer door 3 is changed from the open state to the closed state may be provided, and the measurement value by this counter may be used instead of the above-described integrated lighting time. If the outer door 3 is opened while the ultraviolet lamp 100 is lit and the lighting is interrupted (steps S112 to S115 in FIG. 4) hardly occurs, the measured value by the counter is abbreviated as the integrated lighting time. Proportional relationship.

  In the embodiment described above, the sealing of the culture chamber 4b in the culture apparatus 1 was detected as the closing operation of the outer door 3 through the outer door switch 201. However, the present invention is not limited to this. It may be detected as a closing operation of the inner door 4a. In this case, for example, a micro switch for detecting the closing operation of the inner door 4a may be provided. However, when the opening / closing of the inner door 4a is linked with the turning on / off of the ultraviolet lamp 100, the inner door 4a needs to be formed of, for example, a material that absorbs ultraviolet rays for safety.

  In the above-described embodiment, the ultraviolet lamp 100 is disposed below the duct 43 and above the humidifying tray 44 (see FIGS. 1 and 2), but is not limited thereto. is not. The ultraviolet lamp 100 can be disposed at any position as long as it can effectively sterilize various germs in the air in the culture chamber 4b and the humidified water in the humidifying tray 44, but does not adversely affect the culture. May be.

  In the above-described embodiment, one section of the integrated lighting time for extending the lighting time of the ultraviolet lamp 100 per time is a fixed value such as 200 hours (see FIG. 5). It is not limited and may be a variable value (this is also a fixed time), for example, gradually decreasing with each repetition.

  In the above-described embodiment, the case where the sterilizing ability of the ultraviolet lamp 100 decreases with a linear relationship with respect to the integrated lighting time (see FIG. 5) is not limited to this. The culture apparatus 1 can also be applied to the case where the sterilization ability of the ultraviolet lamp 100 decreases with a non-linear relationship in which the absolute value of the decrease gradient gradually increases with respect to the accumulated lighting time, for example. In this case, what is necessary is just to extend the lighting time of the ultraviolet lamp 100 per time according to the known relationship between integration lighting time and the reduction | decrease of disinfection ability.

  Further, in the above-described embodiment, the lighting time per one time of the ultraviolet lamp 100 is set according to the decrease in the sterilizing ability of the ultraviolet lamp 100, but the present invention is not limited to this. The frequency of the alternating voltage applied to may be set, and the voltage may be set.

  In the above-described embodiment, the ultraviolet lamp 100 is used. However, the means for generating the ultraviolet light may be, for example, an LED (Light-Emitting Diode).

It is side surface sectional drawing of an example of the culture apparatus of this Embodiment. It is a front view of the culture apparatus of FIG. It is a block diagram which shows an example of a structure which manages control of the ultraviolet lamp of the culture apparatus of FIG. It is a flowchart which shows an example of the process sequence of the control part in control of the lighting time of the ultraviolet lamp of this Embodiment. It is a diagram which shows the relationship of the germicidal effect of the ultraviolet-ray with respect to the integral lighting time of the ultraviolet lamp of this Embodiment, and the lighting time per time.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Culture apparatus 2 Outer box 3 Outer door 4 Inner box 4a Inner door 4b Incubation chamber 5 Wall board 5a Fan 6 Air jacket 7 Sensor box 21 Cover 31 Door main body 31a Convex part 32 Control panel 33 Packing 41 Shelf receiving 42 Shelf 43 Duct 44 Humidifying tray 45 Cover 45a Hole 51a Suction port 100 UV lamp 200 Control unit 201 Outer door switch 202 Relay 203 Display 204 Keyboard 205 Timer 206 ROM
207 RAM

Claims (3)

A housing in which a culture chamber for culturing the culture is formed;
A door for sealing the culture chamber;
An ultraviolet lamp that generates ultraviolet light for sterilizing the air in the culture chamber;
A lighting device that lights the ultraviolet lamp for a predetermined time each time it detects that the culture chamber is sealed by the door,
A detection device for detecting a decrease in the sterilization ability of the ultraviolet lamp;
Based on the detection result of the detection device, a control device that controls the lighting device so that the predetermined time becomes longer as the sterilization ability of the ultraviolet lamp decreases.
Equipped with a,
The detection device outputs an integrated time obtained by integrating the lighting time of the ultraviolet lamp as the detection result,
The control device is configured to increase the predetermined time in a stepwise manner every time the integration time passes a certain time, and to increase the predetermined gradient with respect to the integration time and the ultraviolet ray with respect to the integration time. The lighting device is controlled so that the absolute values of the gradients related to the decrease in the sterilizing ability of the lamp substantially coincide with each other.
A culture apparatus characterized by that. The detection device is an ultraviolet sensor that detects the intensity of ultraviolet rays emitted from the ultraviolet lamp,
The culture device according to claim 1, wherein the control device controls the lighting device based on a detection result of the ultraviolet sensor so that the predetermined time becomes longer as the strength becomes weaker. The culture apparatus according to claim 1 or 2, wherein the ultraviolet ray has a wavelength at which generation of ozone is suppressed.

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