JP2011243682A - Heat dissipation mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat dissipation mechanism capable of cooling a light source or a detector without using factory air, a fan, or cooling water during the production of sheets in a clean room.SOLUTION: The heat dissipation mechanism includes a ventilation passage which opens at both sides, at least a first heating element provided inside the ventilation passage or provided adjacent to the ventilation passage, and a second heating element positioned at one end of the ventilation passage and having a heating value which causes heat convection in the ventilation passage.

Description

  The present invention relates to a heat radiating mechanism of a sensor of a measuring unit in, for example, a sheet manufacturing process, and more particularly to a heat radiating mechanism that suppresses generation of dust during sheet manufacturing in a clean room or an area equivalent thereto.

  There are a variety of sheets in the world ranging from food packaging materials, agricultural films, electronic material sheets and battery electrode sheets. In such a film / sheet manufacturing process, it is important to monitor the thickness of the sheet itself and the thickness of the coated material applied to the sheet. A measurement sensor for this purpose is provided in the manufacturing process and performs measurement in real time.

As the types of sensors, there are a transmittance measurement method using X-rays and beta rays, an infrared absorption method, a method using visible light interference, and the like, which are selected in accordance with the properties of the measurement object.
There are two methods for measuring a sheet in the case of online measurement: traversing the sensor head and measuring with the sensor head fixed.

In the case of traversing the sensor head, the measured value in the width direction of the sheet is obtained by attaching the sensor head to a housing called a frame and performing reciprocating motion perpendicular to the flow direction of the sheet.
In the case of measuring with the sensor head fixed, a plurality of sensors are arranged in the sheet width direction, and measurement values in the entire width direction are obtained simultaneously.

  FIG. 3A is a schematic perspective view showing a conventional example of a physical quantity measuring apparatus 1 for measuring a physical quantity (thickness, moisture, etc.) of a sheet (film), and is a system that traverses a sensor head. A sheet 3 is arranged in a frame 2 formed in a square shape and conveyed in the direction of arrow P. The upper and lower sensor heads 4 and 5 are arranged opposite to each other with the sheet 3 interposed therebetween, and are scanned in synchronization with the direction of arrow A along the frame 2 by a driving unit (not shown).

  FIG. 3B is a schematic cross-sectional view of a main part showing another conventional example. The upper and lower sensor heads 4 and 5 are scanned in the arrow A direction along the U-shaped frame 2a. In this example, a heat dissipation mechanism is provided for dissipating heat from heating elements such as infrared rays and radiation sources and light receiving elements disposed in the sensor heads 4 and 5.

  That is, the tubes 7a and 7b are connected to the upper and lower sensor heads 4 and 5, and the factory air injected from one end of the tube 7 is guided into the upper and lower sensor heads 4 and 5, and the air outlets 8a and 8a, The heat generated in the head is radiated by being ejected from 8b.

  FIG. 3C is a schematic cross-sectional view of the main part showing still another conventional example. The upper and lower sensor heads 4 and 5 are scanned in synchronization with the arrow A direction along the U-shaped frame 2a. In this example, fans 9a and 9b are provided in the upper and lower sensor heads 4 and 5, respectively.

JP 2005-002509 A

  By the way, when manufacturing a battery electrode sheet or a WEB sheet of a secondary battery in a clean room, a light source used for the sensor and a cooling mechanism of the sensor become a problem. In the method of reciprocating the sensor over the sheet width, the cooling mechanism may be sufficient or not necessary because the output area of the light source and the detection area of the detector are small.

  When cooling is necessary, there are some cases where fans and factory air are used for cooling as shown in Fig. 3 (b, c) and sprayed on the part to be actively cooled. In many cases, the use of the air becomes nervous with respect to such inhalation and blowing out of air. The reason for this is to promote dust winding and to reduce the yield and quality of the product. In particular, in the electrode sheet of a secondary battery, it is necessary to use nerves for dust because contamination of impurities may lead to a major accident.

  In addition to the above problem, in the measurement over the entire width of the sheet, since the sensors are arranged over the entire width, the output of the light source increases and the number of detector elements also increases. In order to have the same S / N ratio as that of a normal sensor, the cooling / heat dissipating mechanism is correspondingly large.

  Because of these factors, it is not desirable to deal with the above-described cooling and heat dissipation mechanism using a fan or factory air, particularly in a battery electrode sheet manufactured in a clean room. For this reason, it is desirable to avoid as much as possible the use of fans that work to lower the degree of cleanliness, blowout by factory air, and the use of cooling water that is troublesome to handle.

  Accordingly, an object of the present invention is to provide a heat dissipation mechanism that can cool a light source and a detector without using factory air, a fan, or cooling water when manufacturing a sheet in a clean room.

The present invention has been made to solve the above problems, and in the invention of the heat dissipation mechanism according to claim 1,
A ventilation path that is open at both ends, at least one first heating element provided inside or in contact with the ventilation path, and a degree of heat convection that is disposed at one end of the ventilation path. And a second heating element having a calorific value of 2 mm.

In claim 2, in the invention of the heat dissipation mechanism according to claim 1,
The temperature of the second heating element can be controlled.

In Claim 3, in invention of the thermal radiation mechanism of Claim 1,
The ventilating path is provided with a valve mechanism for controlling the size of the opening and the opening time.

In claim 4, in the invention of the heat dissipation mechanism according to claim 1,
The ventilation path is provided in a frame of a physical quantity measuring device for measuring physical characteristics of the sheet, and the first heating element includes at least one of a light emitting element and a light receiving element.

  According to the first to fourth aspects of the present invention, since heat convection is generated in the ventilation path by the second heating element, heat radiation of the first heating element provided inside or in contact with the ventilation path can be promoted. it can. Therefore, it is possible to dissipate heat without using cooling water, factory air, or a fan, and there is an effect of suppressing dust dusting. It also has the effect of reducing equipment utility costs.

  The entire device can be dissipated by one mechanism. Thereby, an apparatus cost and a maintenance expense can be suppressed. Since it is not necessary to use a cooling water / air / fan, the apparatus becomes simple. As a result, it is effective in improving the quality and yield of device manufacturing, shortening the lead time, and suppressing the device cost.

It is a perspective view (a) and an AA sectional view (b) of Drawing 1 (a) showing an example of an embodiment of a heat dissipation mechanism of the present invention. It is sectional drawing which shows another Example. It is explanatory drawing which shows a prior art example.

FIG. 1 is a perspective view (a) showing a configuration of a heat dissipation mechanism of the present invention, and a sectional view (b) taken along line AA in FIG.
In these drawings, reference numeral 2a denotes a U-shaped frame, and a first heating element 10a made of, for example, an X-ray source is fixed in contact with the frame 2a on the lower side of the frame, and the frame 2a is fixed to the upper side of the frame. For example, a first heating element 10b composed of a plurality of detection elements arranged in an array is fixed.

  Reference numeral 12 denotes a ventilation path formed in the frame 2a. As shown in the figure, an air intake 11 is provided on the lower side surface (rightward). The upper and lower ventilation passages 12 of the frame 2a have one end fixed to the right side wall 12a of the frame and the other end divided into two stages by a partition plate 12c that is not in contact with the left side wall 12b of the frame. This is an air passage as indicated by an arrow. Reference numeral 13 denotes a temperature-controllable second heating element (heater) fixed near the air outlet 14, and K is a light beam emitted from the X-ray source.

  In the above configuration, when measuring the physical characteristics of the measurement object (sheet) 3, X-rays are irradiated from the X-ray source 10a toward the sheet 3, and the dose transmitted through the sheet is detected by the detection element 10b. A characteristic associated with the amount of transmission is measured.

In this case, heat is generated from the X-ray source and the detection element constituting the first heating element 10, and the entire apparatus is heated.
Here, when the second heating element 13 is heated, the nearby air is heated and rises to generate convection. As a result, the air taken in from the air intake port flows along the arrow Q, and the first heating element (X-ray source and detection element) is radiated by the air flow.

  FIG. 2 is a schematic sectional view showing another embodiment. The schematic sectional view shown in FIGS. 1A and 1B is different only in the shape of the ventilation path 12, the direction of the air intake port 11, and the direction of the air outlet port 14. ing. That is, air convection is generated by heating the second heating element 13, and the air taken in from the air intake 11 flows in the direction of arrow Q while cooling the first heating element (X-ray source and detection element). Escape from 14.

  Although not shown in the figure, the second heating element may be provided with a temperature control means if necessary, or may be provided with a valve mechanism for controlling the size and opening time of the opening in the ventilation path. The shape and the mounting location of the first heating element can be changed as necessary.

The above description merely shows a specific preferred embodiment for the purpose of explanation and illustration of the present invention. For example, in the present invention, the measurement object is a sheet in a clean room. The first heating element is not limited to the X-ray source or the detection element, and at least one first heating element may be provided in the ventilation path.
Therefore, the present invention is not limited to the above-described embodiments, and includes many changes and modifications without departing from the essence thereof.

1 Physical quantity measuring device 2 Frame 3 Object to be measured (sheet)
4 Upper head 5 Lower head 7 Tube 8 Air outlet 9 Fan
10 First heating element
11 Air intake
12 Ventilation path
13 Second heating element (heater)
14 Air outlet

Claims (4)

  A ventilation path that is open at both ends, at least one first heating element provided inside or adjacent to the ventilation path, and one end of the ventilation path that generates thermal convection in the ventilation path A heat dissipating mechanism comprising a second heat generating element having a heat generation amount of about a degree.   The heat dissipation mechanism according to claim 1, wherein the second heating element can be controlled in temperature.   The heat radiating mechanism according to claim 1, further comprising a valve mechanism that controls a size of an opening and an opening time in the ventilation path.   The said ventilation path is provided in the flame | frame of the physical quantity measuring apparatus for measuring the physical characteristic of a sheet | seat, and the said 1st heat generating body contains at least one of a light emitting element and a light receiving element. Heat dissipation mechanism.