TW201433807A - Constant temperature device - Google Patents

Abstract

An object of the present invention is to provide a constant temperature device, which keeps a plurality of LEDs in a stable atmosphere of uniform temperature in a temperature accelerated lifespan test of LED. The constant temperature device (100) comprises a constant temperature board (10) provided with an electrical heater (11) serving as a heating means and liquid flow passages serving as a cooling means; a plurality of test subject carrying stages (30) arranged on a heat homogenizing plate (20) laminated on the constant temperature board (10); and a cover member (50) that openably/closably covers the plurality of test subject carrying stages (30). The cover member (50) comprises: a separation wall member (51) provided with openings (51a) that surrounds circumferences of the plurality of test subject carrying stages (30); and a light-transmitting top member (52) that encloses the top of the separation wall member (51). A hood (90) of a test subject heating section (70) that covers the constant temperature board (10), the test subject carrying stages (30), and the cover member (50) is mounted through hinges (91) to a casing (80). An air supply fan (92) is mounted on a lower surface of a top section (90a) of the hood (90).

Description

Thermostat

The present invention relates to a thermostat for use in a temperature accelerated life test of an LED (Light Emitting Diode).

Although LED is a light source with a long life, the current situation is that its brightness is slowly attenuated as the lighting time increases. Therefore, as one of the evaluation methods of the life of the LED, the specification of the "IES LM-80" developed by the "North American Lighting Engineering Association" is known. This specification is a maintenance rate (light flux maintenance ratio) of the test luminance to the lighting time of the LED, and the LED lifetime is evaluated based on whether or not the test result is equal to or higher than the constant value.

Specifically, the test method is to continuously illuminate for 6000 hours under the three temperature conditions of 55 ° C, 85 ° C and any temperature determined by the manufacturer (up to 125 ° C) for the test body LED driven by the same current value ( 250 days), the brightness of the LED was measured every 1000 hours. In the case of such a test, it is necessary to maintain the LED as a test body at a constant temperature for a long period of time, and a hot air circulation type thermostatic bath has been conventionally used.

However, in the case where the LED as the test body is placed in a hot air circulating type thermostat, the heat circulating in the thermostat is maintained in order to maintain the temperature. The wind blows directly onto the LED, so it may have an adverse effect on the test results. Further, in the conventional hot air circulating type thermostatic bath, since the uniformity of the temperature distribution in the tank is poor, when a plurality of LEDs are housed, the test accuracy may be lowered.

On the other hand, as a device for performing the temperature accelerated life test of the LED, many types of test devices have been proposed in the past, and the device related to the present invention is, for example, a test device disclosed in Patent Documents 1 and 2.

[Patent Document 1] JP-A-2011-179937

[Patent Document 2] JP-A-2010-245348

In the LED life tester disclosed in Patent Document 1, since one test LED is placed in a HAST device and tested, the temperature distribution is excellent in uniformity, but it is inefficient in performing life test on a plurality of LEDs.

In the test apparatus disclosed in Patent Document 2, since a plurality of light-emitting devices can be disposed in the constant temperature and humidity chamber, the efficiency of the plurality of LEDs is good, but it is difficult to uniformly maintain the temperature of the plurality of LEDs. . Further, the hot line component contained in the light of the plurality of LEDs that continuously emit light causes the temperature in the constant temperature and humidity chamber to rise and exceeds the set temperature, which adversely affects the test result. The higher the output of the LED to be tested (higher brightness), the more remarkable the situation is. Therefore, in recent years, it has become difficult to perform accurate life testing on an LED having a high luminance.

The problem to be solved by the present invention is to accelerate the life of the LED. In the life test, a thermostat device capable of holding a plurality of LEDs in an atmosphere stable at a uniform temperature is provided.

A first constant temperature device according to the present invention includes: a constant temperature plate having a heating means and a cooling means; a plurality of test body loading stages arranged on the constant temperature plate; and a cover body arranged to cover the test body loading table and having a partition wall a member and a cover member of the translucent top member, the partition member surrounding the test body loading table, the top member closing the test body loading table surrounded by the partition member; covering the thermostat plate, The test body loading table and the cover of the cover member; and at least one of an air supply fan that introduces a gas into the cover or an exhaust fan that discharges gas in the cover.

Further, a second constant temperature device according to the present invention includes: a constant temperature plate having a heating means and a cooling means; a plurality of test body loading stages arranged on the constant temperature plate; and a cover body arranged to cover the test body loading table a cover member having a partition member that surrounds the test body loading table, and a light-transmitting top member that surrounds the test body loading table surrounded by the partition member; a plate, the test body loading table and the cover of the cover member; and a temperature adjustment means for adjusting the temperature in the cover.

Further, in the above thermostat, it is preferable that a vent hole is provided in the top member.

Further, in the above-described thermostat, as the cooling means of the constant temperature plate, a liquid passing path through which the cooling liquid can flow can be provided in the constant temperature plate.

In this case, it is preferred to introduce the above-mentioned coolant into the above-mentioned constant The liquid passage in the central portion of the warm plate is discharged from the liquid passage located at the peripheral portion of the constant temperature plate.

Further, it is preferable to provide a liquid temperature adjusting means for raising or lowering the temperature of the coolant supplied to the liquid passing path.

On the other hand, as the cooling means of the constant temperature plate, at least one of a heat sink or a heat pipe may be attached to the constant temperature plate, and a blower fan for cooling the heat sink or the heat pipe may be provided.

Further, as the cooling means of the constant temperature plate, a cooling member having a Peltier element may be attached to the constant temperature plate.

Further, it is appropriate that the gap between the test body loading table and the top member is 3 mm to 15 mm (preferably 8 mm to 10 mm).

According to the present invention, in the temperature accelerated life test of an LED, a thermostat capable of holding a plurality of LEDs in an atmosphere stable at a uniform temperature is provided.

10‧‧‧ thermostat

11, 44, 56‧‧‧ electric heater

12‧‧‧liquid path

12a, 41, 42d‧‧‧ openings

13‧‧‧heater receiving hole

14, 18, 42e‧‧‧ connectors

20‧‧‧Homothermal board

21‧‧‧ trench

30‧‧‧Test body loading platform

40‧‧‧Preheating plate

42‧‧‧liquid path

42a‧‧‧ Straight Tube Department

42b‧‧‧Departure

42c‧‧‧ Confluence Department

43‧‧‧ board main body

50‧‧‧covering components

51‧‧‧ partition member

51a‧‧‧ openings

51b‧‧‧ next door

51c‧‧‧Gap section

52‧‧‧ top member

52a, 93a‧‧ vents

53, 91‧‧‧ Hinges

54‧‧‧ grasper

55‧‧‧Locking members

70‧‧‧Test body heating department

80‧‧‧shell

81‧‧‧ flowmeter

82‧‧‧Flow adjustment dial

83‧‧‧ Signal Tower

83a, 83b, 83c‧‧‧Lighting Department

90‧‧‧ hood

90a‧‧‧ top

90b‧‧‧The Peripheral Department

90x‧‧‧ inner cover

90y‧‧‧ outer cover

92‧‧‧Air supply fan

93‧‧‧ next door

96‧‧ ̄ thermostat

97‧‧‧Air supply fan

100, 200‧‧‧ thermostat

V‧‧‧ direction

W‧‧‧ direction

X‧‧‧ gap

Fig. 1 is a partially omitted perspective view showing a thermostatic device as an embodiment of the present invention.

Fig. 2 is a partially omitted front view of the thermostat shown in Fig. 1.

Fig. 3 is a plan view showing a test body heating unit constituting the thermostat shown in Fig. 1;

Fig. 4 is a front elevational view showing the heating portion of the test body shown in Fig. 3;

Fig. 5 is a perspective view of the test body heating unit shown in Fig. 3;

Fig. 6 is a front elevational view showing a test body heating portion and a preheating plate which constitute the thermostat shown in Fig. 1.

Fig. 7 is a perspective view of the test body heating portion shown in Fig. 6 as seen obliquely from below.

Fig. 8 is a plan view of the preheating plate taken along line B-B of Fig. 6.

Fig. 9 is a cross-sectional view taken along line A-A of Fig. 3;

Fig. 10 is a partially omitted front view showing an outline of a thermostat as another embodiment.

Hereinafter, embodiments of the present invention will be described based on the drawings. As shown in FIG. 1 to FIG. 5, the thermostat 100 of the present embodiment includes an electric heater 11 as a heating means and a constant temperature plate 10 as a cooling means (see FIG. 7); A plurality of test object loading platforms 30 on the heat equalizing plate 20 stacked on the thermostat plate 10; and a cover member 50 that covers the plurality of test body loading platforms 30 in an openable and closable manner. The cover member 50 includes a partition member 51 having an opening portion 51a surrounding the plurality of test object loading platforms 30, and a translucent top member 52 that closes the upper side of the test body loading table 30 surrounded by the partition member 51. .

The cover member 50 is swelled by a plurality of hinges 53 disposed on the back surface of the thermostat plate 10 and the heat equalizing plate 20, and a holder used for opening and closing the cover member 50 is provided on the front surface of the cover member 50. 54. and locking for maintaining the state when the upper surface of the heat equalizing plate 20 is covered by the cover member 50 Member 55. A plurality of vent holes 52a are formed in the top member 52 in the same phase as the arrangement intervals of the plurality of test body loading platforms 30.

In addition, the test body heating unit 70 including the thermostat plate 10, the test body loading table 30, the lid member 50, and the like is disposed on the upper surface of the rectangular parallelepiped casing 80, and the open-closed cover 90 covering the test body heating portion 70 is in the shell. The back side of the upper surface of the body 80 is undulated by a plurality of hinges 91. The cover 90 is a rectangular parallelepiped box member having a lower surface open, and an air supply fan 92 for introducing a gas into the cover 90 is attached to a lower surface of the top portion 90a of the cover 90. A flat partition wall 93 parallel to the top portion 90a is disposed below the air supply fan 92, and a plurality of vent holes 93a are formed in the partition wall 93. Further, a plurality of vent holes (not shown) are also formed in a portion directly above the air supply fan 92 of the top portion 90a. The plurality of vent holes 93a formed in the partition wall 93 form the same phase as the arrangement interval of the plurality of test body loading stages 30.

As shown in FIG. 5 and FIG. 6, in the casing 80 directly under the test body heating unit 70 including the constant temperature plate 10, the heat equalizing plate 20, the test body loading table 30, and the lid member 50, liquid is disposed as a liquid. Preheating plate 40 for temperature adjustment means. As shown in FIG. 1 and FIG. 2, a flow meter 81 that displays the flow rate of the coolant supplied to the liquid passage hole 12 (see FIG. 7) of the constant temperature plate 10 and the flow rate increase and decrease are disposed on the front surface of the casing 80. Flow adjustment dial 82. At a position on the left side surface of the casing 80 near the back surface, a signal tower 83 having a plurality of light-emitting portions 83a, 83b, 83c is erected. The plurality of light-emitting portions 83a, 83b, and 83c are set to emit light with different color lights depending on the operation state of the thermostat device 100.

Next, the test body heating unit 70 will be described with reference to Figs. 3 to 5 . As shown in FIG. 3 to FIG. 5, in the test body heating unit 70, a plurality of test object loading platforms 30 are placed on the upper surface of the heat equalizing plate 20 stacked on the constant-temperature plate 10 having a substantially square shape in plan view, and are oriented in the left-right direction. A total of 25 W and the front-rear direction V are detachably arranged at five equal intervals. On the upper surface of the heat equalizing plate 20, grooves 21 penetrating in the left-right direction W are formed between the test body loading platforms 30 adjacent to each other in the front-rear direction V. These grooves 21 can serve as a wiring space for a power supply line (not shown) of an LED placed on the test object loading table 30 and a signal line (not shown) of a temperature sensor for measuring the temperature in the vicinity of the LED.

The partition member 51 constituting the cover member 50 is a flat member having a substantially circular opening 51a, and the opening 51a is opened in the same phase as the plurality of test body loading platforms 30 disposed on the heat equalizing plate 20. In the partition member 51, the plurality of partition walls 51b partitioning the opening portions 51a adjacent to each other in the left-right direction W are continuous in the front-rear direction V, and the electric heater 56 is placed in a state of being accommodated in each of the partition walls 51b.

When the cover member 50 is laid down horizontally and covers the upper surface of the heat equalizing plate 20, the plurality of test body loading tables 30 are respectively fitted into the opening portion 51a of the partition wall member 51, and the upper surface of the heat equalizing plate 20 and the partition wall member 51 are The lower surface forms a close state. In the thermostat device 100, the test body loading table 30 and the opening portion 51a have a substantially circular shape in plan view. However, the shape is not limited thereto, and other shapes may be adopted as long as they are fitted to each other (for example, The shape of the top view is a square, an ellipse or a polygon, etc.).

In addition, the test body loading table 30 is adjacent to each other in the front-rear direction V. A gap portion 51c is provided between the partition member 51. Similarly to the groove 21 on the upper surface of the heat equalizing plate 20, the notch portion 51c can serve as a power supply line (not shown) of the LED placed on the test body loading table 30 and a signal line of a temperature sensor for measuring the temperature near the LED. Wiring space such as (not shown). When the upper surface of the heat equalizing plate 20 is in close contact with the lower surface of the partition member 51, the notch portion 51c is in a state of being in communication with the groove 21 of the heat equalizing plate 20.

Next, the thermostat plate 10 and the preheating plate 40 will be described with reference to Figs. 6 to 8 . As shown in FIGS. 6 to 8, the thermostat plate 10 is a member formed of a substantially square metal plate, and a region close to the upper surface between the front surface and the back surface thereof is parallel to the plate surface direction and the front-rear direction V. A plurality of heater accommodation holes 13 are opened at equal intervals, and electric heaters 11 are housed in the heater accommodation holes 13, respectively. Further, in a region close to the lower surface between the right side surface and the left side surface of the thermostat plate 10, a plurality of liquid passages 12 are formed at equal intervals so as to be parallel to the sheet surface direction and the left and right direction W.

The plurality of heater accommodation holes 13 and the plurality of liquid passages 12 are in a state of being three-dimensionally intersected in the thermostat plate 10. Further, both end portions of the liquid passage 12 are opened on the right side surface and the left side surface of the thermostat plate 10, and the connector 14 is attached to each of the opening portions 12a. The central portion of each of the plurality of liquid passages 12 communicates with the opening 12b opened on the lower surface of the thermostat plate 10, and the connector 18 is connected to each of the openings 12b.

As shown in FIGS. 6 and 8, the preheating plate 40 is formed by bonding planar electric heaters 44 to the upper and lower surfaces of the plate main body 43 formed of a substantially square metal plate. A liquid supply pipe for introducing a coolant into the preheating plate 40 is connected to the opening portion 41 at the left and right sides of the back surface of the plate main body 43 85. On the upper surface of the preheating plate 40, a plurality of openings 42d for allowing the temperature-adjusted cooling liquid to flow out to the thermostat plate 10 are provided in the preheating plate 40, and are passed through the connectors attached to the respective opening portions 42d. 42e is connected to the coolant pipe 45.

As shown in FIG. 8, the inside of the plate main body 43 which comprises the preheating board 40 is formed with the some opening part 42 d from the left-right opening part 41 of the back surface of the board main-body 43 to the center part of the horizontal direction W of the board main-body 43. Liquid passage path 42. The liquid passage 42 has a straight pipe portion 42a arranged in parallel in the plate main body 43 so as to be parallel to the front-rear direction V, and a front side and a back side in the plate main body 43 to communicate with each other adjacent the straight pipe portions 42a. The folded portion 42b and the two straight pipe portions 42a located near the center in the left-right direction W are combined into one intersecting pipe portion 42c, and a plurality of openings 42d are opened at a predetermined distance in the longitudinal direction of the joining pipe portion 42c.

The coolant that has been fed into the liquid passage 42 of the preheating plate 40 that is heated to a predetermined temperature by the electric heater 44 is sent through the straight pipe portion 42a, the folded portion 42b, and the like. When it is heated to a predetermined temperature, it flows into the junction pipe portion 42c, and flows out from the plurality of openings 42d through the connector 42e into the coolant pipe 45.

The coolant that has flowed out into the coolant pipe 45 rises in the respective cooling pipes 45, and flows into the constant temperature plate 10 through the connector 18 and the opening portion 12b on the lower surface of the constant temperature plate 10 connected to the upper end of the cooling pipe 45. The central portion of path 12. The coolant that has flowed into the liquid-passing path 12 is branched right and left inside, and is discharged from the opening 12a of the right and left side surfaces of the thermostat plate 10, and is discharged to the predetermined discharge pipe 86 connected to the opening 12a through the connector 14. The draining path is discarded or used after a predetermined processing step.

When the thermostat 100 is used, as shown in FIGS. 1 and 5, the cover 90 and the lid member 50 are opened, and LEDs as test bodies are placed on the plurality of test body loading tables 30, respectively, in the pair of power supply lines and temperatures. After the signal line of the sensor is wired, the cover member 50 is closed, the cover member 50 is locked by the lock member 55, and the test body heating portion 70 is covered with the cover 90. Thereafter, power supply to the electric heater 11 of the thermostat plate 10, the electric heater 56 of the cover member 50, and the electric heater 44 of the preheating plate 40 is started, and supply of the cooling liquid (for example, water) to the liquid supply pipe 85 is started. The cooling fan 92 is operated. Thereby, the LED on the test body loading table 30 rises to a preset temperature (for example, 55 ° C, 85 ° C or 125 ° C) and is maintained at this temperature.

In the thermostat device 100, the plurality of test body loading platforms 30 are separated from the atmosphere by the partition walls 51b and the top member 52, respectively, and are continuously heated to a predetermined temperature by the thermostat plate 10 having the heating function and the cover member 50, so that The plurality of LEDs placed on each of the test body loading stations 30 are maintained in an atmosphere that is stable at a uniform temperature. Further, since the vicinity of the test body loading table 30 is ventilated via the vent hole 52a of the top member 52, overheating of the LED can be prevented. Therefore, the temperature accelerated life test of a plurality of LEDs can be efficiently performed with high precision.

Further, since the outside air is sent into the cover 90 from the air supply fan 92 provided in the top portion 90a of the cover 90 via the vent hole 93a of the partition wall 93, the temperature rise in the cover 90 can be suppressed, so that it is effective for preventing overheating of the LED. of. Further, the outside air sent into the cover 90 by the air supply fan 92 passes through the peripheral edge portion 90b and the casing 80 provided on the lower surface of the cover 90. The gap of the upper surface is discharged, so that the air pressure in the cover 90 does not rise abnormally.

Further, as shown in FIG. 9, the gap X between the test body loading table 30 and the top member 52 is set to 3 mm to 15 mm (preferably 8 mm to 10 mm), and if the LED is disposed on the top member 52 in the closest manner, Since most of the light generated from the LED is diverged through the top member 52, the light of the LED that is irradiated onto the partition member 51 or the like can be greatly reduced. Therefore, it is possible to prevent the temperature rise of the partition member 51 or the like caused by the irradiation of the heat rays included in the LED light.

Further, as a cooling means of the constant temperature plate 10, by providing a plurality of liquid passage holes 12 through which the coolant can flow, the constant temperature plate 10 can reliably and uniformly cool the constant temperature plate 10 continuously heated by the electric heater 12. Therefore, it can prevent overheating and is effective for improving the temperature accuracy.

In this case, by providing the preheating plate 40 as the liquid temperature adjusting means for raising the temperature of the coolant supplied to the liquid passing path 12, the temperature of the coolant supplied to the liquid passing path 12 of the constant temperature plate 10 can be made close. The supply of the thermostat plate 10 itself is performed at a set temperature, and the temperature fluctuation of the thermostat plate 10 can be suppressed, and the heating temperature can be stabilized.

In addition, the coolant is introduced into the liquid passage 12 from the opening portion 12b located at the center portion of the constant temperature plate 10 in the left-right direction W, and is opened from the opening portion of the liquid passage 12 which is the left and right side surfaces of the peripheral portion of the constant temperature plate 10. Since the discharge 12a is exhausted, it is effective in suppressing the temperature fluctuation of the thermostat plate 10 due to the inflow of the cooling water.

In addition, it is provided on the partition member 51 constituting the cover member 50. The electric heater 56, which is a sub heating means, also has a heating function as the partition member 51 itself, so that the soaking property can be improved.

As described above, the thermostat device 100 includes the opening and closing cover 90 that covers the test body heating unit 70 (the constant temperature plate 10, the test body loading table 30, the cover member 51, and the like), and covers the entire test body heating unit 70 with a cover. Prevents heat effects due to heat dissipation and outside air.

Next, a thermostat 200 as another embodiment of the present invention will be described based on Fig. 10 . In the thermostat 200 shown in FIG. 10, the same components and functions as those of the above-described thermostat 100 are denoted by the same reference numerals as those in FIGS. 1 to 9, and the description thereof is omitted. .

As shown in FIG. 10, the thermostat device 200 arranges the test body heating unit 70 including the thermostat plate 10, the heat equalizing plate 20, the lid member 50, and the like on the upper surface of the casing 80, and is provided with an inner cover covering the test body heating portion 70. The temperature adjustment means 96 and the blower fan 97 are disposed in the air passage 95 formed between the inner cover 90x and the outer cover 90y, 90x and the outer cover 90y covering the outer periphery of the inner cover 90x. Further, the right side wall 90xa and the left side wall 90xb of the inner cover 90x have air permeability.

When the temperature-acceleration life test of the LED is performed using the test body heating unit 70, when the temperature adjustment means 96 and the blower fan 97 are operated, the temperature-regulating gas adjusted to a predetermined temperature by the temperature adjustment means 96 passes through the blower fan 97. The right side wall 90xa feeds the gas into the inner cover 90x, passes through the inside of the inner cover 90x, and is discharged into the air passage 95 through the left side wall 90xb, and is temperature-adjusted by the temperature adjustment means 96, and then sent again by the air supply fan 97. Inside the inner cover 90x.

As described above, by operating the blower fan 97 and the temperature adjustment means 96, the temperature adjustment gas is circulated between the inside of the inner cover 90x and the air passage 95, so that the temperature in the inner cover 90x can be maintained at a predetermined temperature, so that it can be prevented. The thermal effects of the outside air, in the temperature accelerated life test of the LED, can maintain multiple LEDs in an atmosphere that is stable at a uniform temperature.

On the other hand, the cooling means of the thermostat plate 10 is not limited to the above-described apparatus, and although not shown in the other cooling means, a heat sink may be attached to the lower surface and the outer peripheral surface of the thermostat plate 10, and the heat dissipation may be provided. The air supply fan that cools the unit. In this case, it is preferable to provide a cover for airflow rectification between the radiator and the blower fan.

Further, although the cooling means of the thermostat plate 10 is not shown, a heat pipe may be attached to the lower surface and the outer peripheral surface of the thermostat plate 10 via a heat conduction member, and a heat sink may be attached to a part of the heat pipe to provide the heat sink. Cooled air supply fan. In this case, a cover for airflow rectification may be provided between the radiator and the blower fan.

Further, although the cooling means of the thermostat plate 10 is not shown, a cooling member having a Peltier element may be attached to the thermostat plate 10.

Further, the thermostats 100, 200 and the like described with reference to Figs. 1 to 10 are devices showing an example of the present invention, and the thermostats of the present invention are not limited to the above-described thermostats 100 and 200.

Industrial availability

The thermostat device of the present invention can perform temperature acceleration of various LEDs It is widely used in the fields of electronics and motor industry or machinery industry.

10‧‧‧ thermostat

11‧‧‧Electric heater

14‧‧‧Connector

20‧‧‧Homothermal board

50‧‧‧covering components

51‧‧‧ partition member

52‧‧‧ top member

52a‧‧‧Ventinel

54‧‧‧ grasper

70‧‧‧Test body heating department

80‧‧‧shell

81‧‧‧ flowmeter

82‧‧‧Flow adjustment dial

83‧‧‧ Signal Tower

90‧‧‧ hood

90a‧‧‧ top

90b‧‧‧The Peripheral Department

91‧‧‧ Hinges

92‧‧‧Air supply fan

93‧‧‧ next door

93a‧‧‧Ventinel

100‧‧‧ thermostat

Claims (9)

A constant temperature device comprising: a constant temperature plate having a heating means and a cooling means; a plurality of test body loading platforms arranged on the thermostat plate; and a cover member disposed to cover the test body loading table and having a partition member and a translucent top member a cover member that surrounds the test body loading table, the top member is closed above the test body loading table surrounded by the partition member; and covers the thermostat plate, the test body loading table, and the cover a cover of the member; and at least one of an air supply fan that introduces a gas into the cover or an exhaust fan that discharges gas in the cover. A constant temperature device comprising: a constant temperature plate having a heating means and a cooling means; a plurality of test body loading platforms arranged on the thermostat plate; and a cover member disposed to cover the test body loading table and having a partition member and a translucent top member a cover member that surrounds the test body loading table, the top member is closed above the test body loading table surrounded by the partition member; and covers the thermostat plate, the test body loading table, and the cover a cover of the member; and a temperature adjustment means for adjusting the temperature in the cover. A thermostatic device according to claim 1 or 2, wherein A vent hole is provided in the top member. The thermostat according to any one of the first to third aspects of the invention, wherein the cooling means for allowing the cooling liquid to flow is provided in the constant temperature plate as a cooling means of the constant temperature plate. The thermostat according to claim 4, wherein the coolant is introduced into the liquid passage located at a central portion of the thermostat, and is discharged from the liquid passage located at a peripheral portion of the thermostat. The thermostat according to claim 4 or 5, wherein the liquid temperature adjusting means for raising or lowering the temperature of the coolant supplied to the liquid passage is provided. The thermostat according to any one of the first to third aspects of the present invention, wherein at least one of a heat sink or a heat pipe is attached to the constant temperature plate as a cooling means of the constant temperature plate, and is provided to cool the heat dissipation. Or the air supply fan of the above heat pipe. The thermostat according to any one of claims 1 to 3, wherein a cooling member having a Peltier element is attached to the thermostat as a cooling means of the thermostat. The thermostat device according to any one of claims 1 to 8, wherein The gap between the test body loading table and the top member is set to be 3 mm to 15 mm.