TW201403092A - Constant temperature device - Google Patents

Abstract

The object of the present invention is to provide a constant temperature device, which keeps a plurality of LEDs in a stable environment in a uniform temperature in a temperature accelerated life test of LEDs. The solution of the present invention is a constant temperature device (100), which comprises a heating device, namely an electric heater (11), and a cooling device, namely a constant temperature plate (10) of liquid passage holes; a plurality of sample carriers (30) arranged on a uniform-temperature plate (20) laminated on the constant temperature plate (10); and a cover member (50) that is arranged to cover the sample carriers (30) and comprises a partition member (51) surrounding circumferences of the sample carriers (30) and a light-transmitting top plate member (52) that closes the top side of the sample carriers (30) surrounded by the partition member (51). A sample heating section (7) of the constant temperature plate (10), the uniform-temperature plate (20), and sample carriers (30), and the cover member (50) are arranged on a top surface of a casing (80) and a liquid temperature regulation device, namely a pre-heating plate (40), is arranged in the casing (80) located under the sample heating section (70).

Description

Thermostat

The present invention relates to a thermostat for temperature accelerated life testing of LEDs (Light Emitting Diodes).

The LED is a light source with a long life, but the actual situation is that its brightness slowly decays with the lighting time. Here, as one of the evaluation methods for the life of the LED, the "IES LM-80" specification developed by the "North American Lighting Engineering Association" is well known. This specification tests the maintenance ratio (luminous flux maintenance ratio) of the brightness of the LED to the lighting time, and evaluates the life of the LED by the test result whether it is above a certain value.

Specifically, this is for a sample LED driven by the same current value, continuously lighting for 6000 hours (250 days) at 55 ° C, 85 ° C and any temperature determined by the manufacturer (up to 125 ° C). A test method for measuring the brightness of an LED every 1000 hours. In the case of performing such a test, it is necessary to maintain the sample, that is, the LED, at a constant temperature for a long period of time. However, in the past, a warm air circulation type thermostatic bath has been frequently used. However, in the case where the sample, that is, the LED, is placed in a thermostat circulating thermostat, the warm air that is kept in the thermostat for the temperature is often directly hitting the LED. Therefore, the test results have the possibility of being adversely affected. Further, in the conventional warm air circulation type thermostatic bath, since the temperature distribution in the tank is poor in uniformity, when a plurality of LEDs are accommodated, the test accuracy tends to be lowered.

On the other hand, as a device for performing the temperature accelerated life test of the LED, various test devices have been proposed in the past, and the device according to the present invention includes, for example, the test devices described in Patent Documents 1 and 2.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2011-179937

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2010-245348

In the LED life test apparatus described in Patent Document 1, since one test LED is placed in the HAST device and tested, the uniformity of the temperature distribution is excellent. However, when the life test is performed on a plurality of LEDs, the efficiency is inferior.

In the test apparatus described 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 in reality, it is difficult to uniformly maintain the plurality of LEDs. temperature.

The problem to be solved by the present invention is to provide a In the temperature accelerated life test of the LED, a plurality of LEDs can be held in a constant temperature device in an environment where the temperature is stable at a uniform temperature.

The thermostat device of the present invention includes: a constant temperature plate having a heating device and a cooling device; a plurality of sample loading platforms arranged on the thermostat plate; and a cover plate covering the sample loading table and surrounding the sample loading table The surrounding partition member and the cover member of the translucent top plate member that blocks the upper side of the sample loading table surrounded by the partition member.

According to this configuration, the plurality of sample loading stages are separated from the atmosphere by the partition wall and the top plate member, and the plurality of sample loading stages are held at a predetermined temperature by the thermostat plate, so that the plurality of sample loading stages can be placed. The plurality of LEDs on each sample loading station are maintained in an environment that is stable at a uniform temperature. Therefore, the temperature accelerated life test of a plurality of LEDs can be efficiently performed with high precision.

Here, as the cooling means of the constant temperature plate, it is preferable that the liquid passage hole of the flowable coolant is provided on the constant temperature plate. According to such a configuration, since the constant temperature plate can be reliably and uniformly cooled, it is effective for improving the temperature accuracy.

In this case, it is preferable to provide a liquid temperature adjusting device that raises or lowers the temperature of the coolant supplied to the through hole. According to this configuration, since the temperature of the coolant supplied to the through hole of the thermostat plate can be supplied close to the set temperature of the thermostat itself, the temperature of the thermostat can be suppressed. The degree of change is effective for the stabilization of the heating temperature.

Further, it is preferable that the sub-heating device is provided to the partition member. According to such a configuration, since the partition member itself also has a heating function, it is possible to improve the heat uniformity.

On the other hand, a cover covering the aforementioned thermostat plate, the aforementioned sample loading table, and the above-described cover member may be provided. According to such a configuration, since the state in which the entire member for heating the sample is covered by the cover is formed, heat dissipation can be prevented. Further, by providing the casing, the temperature of the member which heats the sample can be stabilized, and the light emitted from the sample placed on the sample loading table can be prevented from being diverged.

According to the present invention, it is possible to provide a thermostat capable of maintaining a plurality of LEDs in an environment where the temperature is stabilized at a uniform temperature in the temperature accelerated life test of the LED.

10‧‧‧ thermostat

10b, 43b‧‧‧ back

10c, 43c‧‧‧ right side

10d, 43d‧‧‧ left side

10f‧‧‧ positive

10t‧‧‧ lower surface

10u‧‧‧ upper surface

11, 44, 56‧‧‧ electric heater

12‧‧‧ liquid hole

12c, 12d, 41, 44c, 44d‧‧‧ link

13‧‧‧heater receiving hole

14‧‧‧Connector

15c, 15d‧‧‧ drain tube

16c, 16d‧‧‧ liquid collecting member

17‧‧‧Confluence components

20‧‧‧Homothermal board

21‧‧‧ trench

30‧‧‧Sample loading station

40‧‧‧Preheating plate

42, 42c, 42d‧‧‧ liquid path

43‧‧‧ board body

45c, 45d‧‧‧ coolant tube

50‧‧‧covering components

51‧‧‧ partition member

51a‧‧‧ openings

51b‧‧‧ next door

51c‧‧‧cutting section

52‧‧‧Top member

53‧‧‧Hinges

54‧‧‧ Holder

55‧‧‧Lock components

70‧‧‧sample heating unit

80‧‧‧shell

81‧‧‧ flowmeter

82‧‧‧Flow adjustment dial

83‧‧‧very button

84‧‧‧Support feet

85‧‧‧ Liquid supply pipe

86‧‧‧Draining tube

90‧‧‧Shell

91‧‧‧punched metal

91a‧‧‧through hole

92‧‧‧Monitoring window

93‧‧‧ cover

100‧‧‧ thermostat

V‧‧‧ direction

W‧‧‧ direction

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

Fig. 2 is a plan view showing the thermostat of Fig. 1.

Fig. 3 is a front view showing the thermostat of Fig. 1.

Fig. 4 is a left side view showing the thermostat of Fig. 1.

[Fig. 5] is a thermostatic device shown in Fig. 1 in a state in which a casing is mounted. Stereoscopic view.

Fig. 6 is a perspective view showing a sample heating unit constituting the thermostat shown in Fig. 1 .

Fig. 7 is a perspective view showing the sample heating unit shown in Fig. 6 in a state in which the lid member is opened.

FIG. 8 is a partially omitted side view seen from the direction of the arrow X in FIG. 7. FIG.

Fig. 9 is a plan view showing a thermostat plate constituting the thermostat shown in Fig. 1;

FIG. 10 is a view as seen from the direction of arrow A in FIG. 9.

FIG. 11 is a view as seen from the direction of arrow B in FIG. 9.

Fig. 12 is a horizontal sectional view at the line H-H of the preheating plate shown in Fig. 3.

FIG. 13 is a view showing a piping state of a coolant in the thermostat shown in FIG. 1.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1 to FIG. 5, the thermostat device 100 of the present embodiment includes a thermostat 10 having a heating device, that is, an electric heater 11 and a cooling device, that is, a through hole 12 (see FIG. 8); a plurality of sample loading stages 30 on the heat equalizing plate 20 on the 10; and a partition wall member 51 and a partition wall member 51 surrounded by the partition wall member 51, which are disposed to cover the sample loading table 30 and have a periphery surrounding the sample loading table 30 Sample loading station 30 The cover member 50 of the translucent top plate member 52 that is closed above. The cover member 50 is undulated 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 54 used for opening and closing operations is provided on the front surface of the cover member 50. And a lock member 55 for maintaining the locked state.

The sample heating unit 70 including the thermostat plate 10, the heat equalizing plate 20, the sample loading table 30, the lid member 50, and the like is disposed on the upper surface of the rectangular parallelepiped casing 80, and the shell directly below the sample heating portion 70 In the body 80, a preheating plate 40 which is a liquid temperature adjusting device is disposed. A flow meter 81 that displays the flow rate of the coolant supplied to the liquid passage hole 12 of the thermostat plate 10 and a flow rate adjustment dial 82 that increases or decreases the flow rate are disposed on the front surface of the casing 80. On the side surface of the casing 80, a very button 83 for shutting off the power in the event of an emergency or the like is disposed. On the lower surface of the casing 80, a plurality of support legs 84 are provided which are respectively adjustable in height. On the back surface of the casing 80, a liquid supply pipe 85 for introducing the coolant supplied to the liquid passage hole 12 of the thermostat plate 10 into the casing 80 and a coolant discharged from the liquid passage hole 12 are discharged to the outside of the casing 80. The drain tube 86.

As shown in FIGS. 1 and 5, the thermostat device 100 includes a detachable cover 90 for covering the sample heating unit 70 disposed on the upper surface of the casing 80. The casing 90 is smaller than the casing 80, and is a substantially rectangular parallelepiped casing having a bottom portion open, and the top plate portion is formed by a punching metal 91 having a plurality of through holes 91a formed on the entire surface thereof. A monitor window 92 for observing the condition of the sample heating unit 70 and a lid 93 for opening and closing the monitoring window 92 are provided on the front surface of the casing 90.

Next, the sample heating unit 70 will be described with reference to Figs. 6 to 8 . As shown in FIG. 6 to FIG. 8 , on the upper surface of the heat equalizing plate 20 laminated on the constant-temperature plate 10 having a substantially square plan view, a plurality of sample loading platforms 30 are respectively in the left-right direction W and the front-rear direction V. A total of 25 are arranged at equal intervals, and are arranged to be detachable. On the upper surface of the heat equalizing plate 20, grooves 21 penetrating in the left-right direction W are formed between the sample loading stages 30 adjacent to each other in the front-rear direction V. These grooves 21 are used to route a power supply line to an LED placed on the sample loading stage 30, a signal line of a temperature sensor for measuring the temperature in the vicinity of the LED, and the like.

The partition member 51 constituting the cover member 50 is a mesh member having a substantially square opening portion 51a that is opened in the same phase as the plurality of sample loading stages 30 disposed on the heat equalizing plate 20. An electric heater 56 is disposed in the partition wall 51b forming the front-back direction V of the partition member 51. When the cover member 50 is horizontally laid down and covers the upper surface of the heat equalizing plate 20, a plurality of sample loading tables 30 are respectively inserted into the opening portions 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 surface forms a close contact state. In the thermostat device 100, the sample loading table 30 and the opening 51a have a substantially square 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, a plan view) The shape is a circle, an ellipse or a polygon, etc.).

Further, a notch portion 51c is provided at the partition wall 51b between the sample loading stages 30 adjacent to each other in the front-rear direction V. Similarly to the groove 21, the notch portion 51c is a signal for arranging a power supply line for the LED placed on the sample loading table 30 and a temperature sensor for measuring the temperature in the vicinity of the LED. Line and so on. When the upper surface of the heat equalizing plate 20 is in close contact with the lower surface of the partition wall 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 will be described with reference to Figs. 9 to 11 . As shown in FIGS. 9 to 11, the thermostat plate 10 is a member formed of a substantially square metal plate, and a plurality of heaters are equally spaced between the front surface 10f and the back surface 10b in a region close to the upper surface 10u. The hole 13 is accommodated in parallel with the plate surface direction and the front-rear direction V, and the electric heater 11 is housed in each of the heater accommodation holes 13 (see FIG. 1). Further, between the right side surface 10c of the thermostatic plate 10 and the left side surface 10d, a plurality of liquid passage holes 12 are formed at equal intervals in a region close to the lower surface 10t so as to be parallel to the plate surface direction and the left and right direction W. Therefore, the plurality of heater accommodation holes 13 and the plurality of liquid passage holes 12 are in a state of being three-dimensionally intersected with each other in the thermostat plate 10. Further, both end portions of the liquid passage hole 12 communicate with the joint portions 12c and 12d formed on the right side surface 10c and the left side surface 10d of the thermostat plate 10, respectively.

Next, the preheating plate 40 will be described with reference to Figs. 3 and 12 . As shown in FIGS. 3 and 12, the preheating plate 40 is formed by attaching a planar electric heater 44 to the upper and lower surfaces of the plate main body 43 formed of a substantially square metal plate. As shown in FIG. 12, a connecting portion 41 to the liquid supply pipe 85 is opened on the back surface 43b of the plate main body 43, and a plurality of cooling liquid pipes 45c are respectively opened on the right side surface 43c and the left side surface 43d of the plate main body 43. 45d connecting portions 44c, 44d.

Inside the plate body 43 is formed from the joint portion 41 The liquid-passing path 42 communicates with the crank-shaped liquid-passing path 42c of the plurality of connecting portions 44c, and similarly, the crank-shaped liquid-passing path 42d that communicates from the connecting portion 41 to the plurality of connecting portions 44d via the liquid-passing path 42. The coolant supplied from the liquid supply pipe 85 to the preheating plate 40 heated to a predetermined temperature by the planar electric heater 44 is heated to the predetermined temperature while passing through the liquid passages 42, 42c and 42d. The plurality of connecting portions 44c and 44d flow out into the cooling liquid pipes 45c and 45d, respectively.

As shown in FIGS. 9, 12, and 13, the upper end of the coolant pipe 45c connected to the connecting portion 44c of the right side surface 43c of the plate main body 43 of the preheating plate 40 is opened on the right side surface 10c of the thermostat plate 10, respectively. Each of the connection portions 12c of the plurality of liquid passage holes 12 is connected via a connector 14 interposed therebetween, and the upper end of the liquid discharge pipe 15c is connected to the connector 14 via the connector 14 in the remaining connection portion 12c.

In addition, the upper end of the cooling pipe 45d connected to the connecting portion 44d of the left side surface 43d of the plate main body 43 of the preheating plate 40 is not connected to the cooling pipe among the plurality of connecting portions 12d opened on the left side surface 10d of the thermostat plate 10. The connecting portion 12d of the through hole 12 that communicates with the 45c is connected via a connector 14 (see Fig. 2), and the upper end of the drain pipe 15d is connected to the connector 14 via the connector 14 in the remaining connecting portion 12d.

A plurality of liquid collecting members 16c and 16d are disposed at a position lower than the sample heating unit 70 and the preheating plate 40, and the lower end of the liquid discharge pipe 15c connected to the right connecting portion 12c of the thermostat plate 10 and the liquid collecting member 16c are disposed. The lower end of the drain pipe 15d connected to the connecting portion 12d on the left side of the thermostat plate 10 is connected to the liquid collecting member 16d. In the shape of a quadrangular prism The drain pipes 86c and 86d are connected to the pieces 16c and 16d, respectively, and the downstream side of the drain pipes 86c and 86d communicate with the drain pipe 86 via the merging member 17.

As shown in Figs. 9, 12, and 13, the flow path from the liquid supply pipe 85 to the preheating plate 40 flows through the liquid passing paths 42 and 42c in the preheating plate 40 heated by the electric heater 44. Then, the coolant heated to the predetermined temperature flows out to the coolant pipe 45c on the right side, flows into the liquid passage hole 12 from the connection portion 12c of the right side surface 10c of the thermostat plate 10, and flows from right to left in the liquid passage hole 12. The drain portion 15d flows out from the joint portion 12d of the left side surface 10d (see FIG. 9) of the thermostat plate 10, and is discharged from the drain pipe 86 via the liquid collecting member 16d and the drain pipe 86d.

On the other hand, the coolant flowing through the liquid passages 42 and 42d in the preheating plate 40 to be heated to a predetermined temperature and flowing out to the coolant pipe 45d on the left side is connected from the left side surface 10d of the constant temperature plate 10 The portion 12d flows into the liquid passage hole 12, flows from left to right in the liquid passage hole 12, and then flows out from the connection portion 12c of the right side surface 10c of the constant temperature plate 10 to the liquid discharge pipe 15c, through the liquid collection member 16c and the liquid discharge. The tube 86c is discharged from the drain pipe 86.

When the thermostat device 100 is used, the lid member 50 is opened, and the sample, that is, the LED, is mounted on each of the plurality of sample loading stations 30, and the wiring of the power supply line and the signal line of the temperature sensor is performed, and the cover member is closed. 50. The cover member 50 is closed by the lock member 55. Thereafter, 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 are started to supply power, and the supply of the cooling liquid (for example, water) to the liquid supply pipe 85 is started. Thereby, the LED on the sample loading table 30 rises to the advance Set the temperature (for example, 55 ° C, 85 ° C or 125 ° C) and keep it at this temperature.

In the thermostat apparatus 100, a plurality of sample loading stages 30 are separated from the atmospheric zone by the partition wall 51b and the top plate member 52, respectively, and since the thermostat plate 10 having the heating function and the lid member 50 are continuously heated to a predetermined temperature, The plurality of LEDs placed on each of the sample loading stations 30 can be maintained in an environment that is stable at a uniform temperature. Therefore, the temperature accelerated life test of a plurality of LEDs can be efficiently performed with high precision.

Further, as the cooling device of the constant temperature plate 10, since a plurality of liquid passage holes 12 through which the coolant can flow are provided on the constant temperature plate 10, the constant temperature plate 10 continuously heated by the electric heater 12 can be surely and uniformly cooled. Therefore, it can prevent overheating and is effective for improving the temperature accuracy.

In this case, as the liquid temperature adjusting device that raises the temperature of the coolant supplied to the liquid passing hole 12, the coolant supplied to the liquid passing hole 12 of the constant temperature plate 10 can be supplied through the provision of the preheating plate 40. Since the temperature is supplied close to the set temperature of the constant temperature plate 10 itself, the temperature fluctuation of the thermostat plate 10 can be suppressed, and it is effective for the stabilization of the heating temperature.

In addition, since the partition wall member 51 itself is provided with the electric heater 56, which is a sub-heating device, the partition member 51 itself has a heating function, so that uniform heating can be improved.

Further, as shown in FIGS. 1 and 5, the thermostat device 100 includes a detachable cover 90 that covers the sample heating portion 70 (the thermostat plate 10, the sample loading table 30, the cover member 51, and the like). The heat spread can be prevented by covering the entire sample heating portion 70 with a cover as needed. Lost.

Further, the thermostat 100 described with reference to FIGS. 1 to 13 is an example of the present invention, and the thermostat of the present invention is not limited to the thermostat 100. Therefore, the number, shape, and the like of the sample loading table 30 can be changed in accordance with the use conditions. Further, instead of the preheating plate 40, a preheating plate having the same structure and function as the thermostat plate 10 may be used.

[Industrial availability]

The thermostat of the present invention can be widely utilized in temperature accelerated life testing of various LEDs.

10‧‧‧ thermostat

11, 56‧‧‧ electric heater

14‧‧‧Connector

20‧‧‧Homothermal board

30‧‧‧Sample loading station

40‧‧‧Preheating plate

50‧‧‧covering components

51‧‧‧ partition member

51a‧‧‧ openings

51b‧‧‧ next door

52‧‧‧Top member

54‧‧‧ Holder

55‧‧‧Lock components

70‧‧‧sample heating unit

80‧‧‧shell

81‧‧‧ flowmeter

82‧‧‧Flow adjustment dial

83‧‧‧very button

84‧‧‧Support feet

86‧‧‧Draining tube

100‧‧‧ thermostat

Claims (5)

A thermostatic device comprising: a thermostat plate having a heating device and a cooling device; a plurality of sample loading platforms arranged on the thermostat plate; and a cover member configured to cover the sample loading platform and having the sample sample surrounding A partition member around the loading table and a translucent top plate member that is closed above the sample loading table surrounded by the partition member. The thermostat according to claim 1, wherein the through hole of the flowable coolant is provided on the thermostat as the cooling means of the thermostat. The thermostat according to claim 2, wherein a liquid temperature adjusting device that raises or lowers the temperature of the coolant supplied to the through hole is provided. The thermostat according to any one of claims 1 to 3, wherein the partition member is provided with a sub heating device. The thermostat according to any one of claims 1 to 4, wherein a cover covering the thermostat plate, the sample loading table, and the cover member is provided.