JP4869427B1 - Condensation prevention mechanism - Google Patents

Abstract

An object of the present invention is to provide a dew condensation prevention mechanism in which a glass attached to a hermetically sealed casing does not condense even under severe temperature changes.
The dew condensation prevention mechanism of the present invention prevents dew condensation on glass attached to a part of a hermetically sealed casing. The condensation prevention mechanism of the present invention includes a heat source part, a duct part, and a condensation part. The heat source unit is disposed in the housing and includes a heat source that generates heat and a fan that moves the air heated by the heat source. If necessary, a fan may be provided in the vicinity of the dew condensation part. A duct part guides the air warmed by the heat-source part to the position of glass, and moves the warmed air along the inner surface of glass. A dew condensation part is a part inside the housing | casing which the air which passed the inner surface of glass contacts, and the temperature of the said part changes according to external temperature.
[Selection] Figure 2

Description

  The present invention relates to a dew condensation preventing mechanism for preventing dew condensation of a glass of a sealed casing partially attached with glass, and more particularly to prevention of dew condensation of glass of a camera stabilizer.

  A camera stabilizer is known as a device that is attached to the outside of a helicopter or the like and shoots an image from above. Since the camera stabilizer is often exposed to strong winds, it is composed of a sealed housing, a camera installed in the housing, and a mechanism for changing the orientation of the camera. As a method for removing fogging of the glass of the camera stabilizer, there is an invention of Patent Document 1. In the invention of Patent Document 1, fogging is prevented by applying wind to the inner surface of the glass.

  In addition, although no literature was found, the camera stabilizer housing is sealed, so the anti-fogging method is also used in which dry nitrogen gas is sealed inside the housing just before the helicopter takes off and the humidity inside the housing is lowered. Have been used.

  Furthermore, as a method for removing the fog of the glass of the camera housing for outdoor installation, there is an invention of Patent Document 2. The camera housing for outdoor installation is often not sealed, and has a structure in which air inside the housing and outside air can be circulated by a fan or the like. In the invention of Patent Document 2, the air is dehumidified by heat exchange, the dehumidified air is heated to further reduce the humidity, and then blown out between the glass and the lens. Further, water accumulated by dehumidification is discharged out of the camera housing.

JP 2004-258293 A JP-A-8-205007

  Since the camera stabilizer is attached to a helicopter or the like, the camera stabilizer may be used in a very high space (for example, an altitude of 6000 m), and the temperature difference from the ground may be 40 degrees. Moreover, since it is exposed to a strong wind, the temperature of a housing will become the same level as external temperature immediately. In order to meet such severe conditions, a method of sealing dry nitrogen gas in the housing immediately before takeoff was effective. However, the method of encapsulating dry nitrogen cannot be used when the helicopter has to be dispatched urgently. Furthermore, the method of Patent Document 2 cannot be used as it is because the casing is an open type and is not premised on the use in a severe environment such as a camera stabilizer.

  An object of the present invention is to provide a dew condensation prevention mechanism in which a glass attached to a hermetic enclosure does not dew even under severe temperature changes.

  The dew condensation prevention mechanism of the present invention prevents dew condensation on the glass attached to a part of the sealed casing. For example, condensation of glass attached to the housing of the camera stabilizer is prevented. The condensation prevention mechanism of the present invention includes a heat source part, a duct part, and a condensation part. The heat source unit is arranged in a housing and includes a heat generation source (servo amplifier in the case of a camera stabilizer) that generates heat and a fan that moves air heated by the heat generation source. If necessary, a fan may be provided in the vicinity of the dew condensation part. A duct part guides the air warmed by the heat-source part to the position of glass, and moves the warmed air along the inner surface of glass. A dew condensation part is a part inside the housing | casing which the air which passed the inner surface of glass contacts, and the temperature of the said part changes according to external temperature. A heat source (servo amplifier) is disposed on the upper side of the housing, and a dew condensation portion is disposed on the lower side of the housing. The “sealed enclosure” means an enclosure that does not allow external wind and rain to enter the inside. Furthermore, you may also provide the heat ray | wire which warms air in the circumference | surroundings of glass and the inside of a duct part.

  According to the dew condensation prevention mechanism of the present invention, the heat generation source is disposed on the upper side of the housing, and the dew condensation portion is disposed on the lower side of the housing. In other words, considering the state where there is no fan, the cold air is in the vicinity of the dew condensation part, that is, the air is further cooled if the outside air temperature decreases. Moreover, warm air is heated near the heat source, that is, further warmed. Since such air is circulated by the fan, it is possible to sufficiently condense and remove moisture, and to sufficiently warm the air and reduce the humidity. Therefore, even when the temperature of the outside air changes drastically, it is possible to prevent dew condensation on the glass attached to the sealed casing.

The figure which shows the external view of a camera stabilizer. Side surface sectional drawing which shows the internal structure of a camera stabilizer. The front view of a camera stabilizer. The figure which is an internal structure of a camera stabilizer, Comprising: The structure from a heat-source part to glass vicinity. The figure which shows the structure of glass vicinity. Sectional drawing which shows arrangement | positioning of the cylindrical part of a housing, a duct part, and a heat ray. The figure which shows the image of the relationship between the temperature near the dew condensation part of the dew condensation prevention mechanism of this invention, and the inner side of glass, and humidity. The figure which shows the result of having investigated the temperature and humidity near glass inner side by changing the external temperature from 30 degreeC to -20 degreeC by setting the initial state inside a housing to 30 degreeC and 60% of humidity.

  Hereinafter, embodiments of the present invention will be described in detail. In addition, the same number is attached | subjected to the structure part which has the same function, and duplication description is abbreviate | omitted.

  The dew condensation prevention mechanism of the present invention is a dew condensation for a camera stabilizer comprising a hermetically sealed casing partially attached with glass, a camera arranged in the casing, and a mechanism for changing the orientation of the camera. It is a prevention mechanism. However, it is not applicable only to camera stabilizers, and condensation can be similarly prevented as long as the glass is attached to a part of a sealed casing. The “sealed enclosure” means an enclosure that does not allow external wind and rain to enter the inside.

  FIG. 1 shows an external view of the camera stabilizer. 1A is a perspective view, and FIG. 1B is a side view. FIG. 2 is a side sectional view showing the internal structure of the camera stabilizer. FIG. 3 is a front view of the camera stabilizer. FIG. 4 is a diagram showing the internal structure of the camera stabilizer from the heat source part to the vicinity of the glass. 5A and 5B are diagrams showing the structure in the vicinity of the glass. FIG. 5A is a cross-sectional view taken along the line AA in FIG. 4, and FIG. 5B is an enlarged view of a portion B in FIG. FIG. 6 is a cross-sectional view showing the arrangement of the cylindrical portion, duct portion and heat ray of the casing, FIG. 6 (A) is a diagram showing the overall arrangement, and FIG. 6 (B) is the portion C of FIG. 6 (A). It is an enlarged view.

  The camera stabilizer 100 includes a housing 110, a fixing part 120, a glass holding part 130, a glass 140, a support part 150, a duct part 160, a camera 210, a lens 220, a mechanism part 230, a dew condensation part 310, a heat source part 320, and a heat ray 330. . The casing 110 is a spherical sphere portion 111 that accommodates most of the internal components, and has a cylindrical shape. One end of the cylindrical shape is attached to a part of the spherical portion 111, and the glass 140 is attached to the other end of the cylindrical shape. And the cylindrical portion 112 formed. The fixing unit 120 is a member for fixing the camera stabilizer 100 to a body such as a helicopter.

  The glass holding part 130 is a structural part for holding the glass 140 on the cylindrical part 112, and includes, for example, glass holding parts 131 and 132, a heat insulating material 133, a sealing part 134, a screw 135, and the like (FIG. 5B ), See FIG. 6B). The glass holding component 131 and the glass holding component 132 are made of, for example, aluminum, and are components that ensure mechanical reliability for reliably holding the glass 140 in the cylindrical portion 112 for a long period of time. The heat insulating material 133 is a component for preventing the heat inside the casing 110 (particularly the heat on the inner surface of the glass) from escaping through the glass holding components 131 and 132. It should be noted that there is a gap in the boundary portion between the glass holding component 131 and the glass holding component 132 and where the heat insulating material 133 is not provided, so that heat is hardly transmitted. The seal part 134 is a part for ensuring the confidentiality of the casing 110, and the screw 135 holds the glass 140 on the cylindrical portion 112 by tightening the glass holding parts 131 and 132.

  Glass 140 is a window for photographing by camera 210 mounted inside housing 110. In order to capture a clear image, the glass 140 is required to have high specifications such as transparency, and a double window or a coating for preventing condensation cannot be employed. This also makes it difficult to prevent condensation. The support 150 is a component that attaches the housing 110 so that it can operate on the fixed part 120.

  The duct unit 160 guides the air heated by the heat source unit 320 to the position of the glass 140 and moves the heated air along the inner surface of the glass 140. The mechanism unit 230 is a mechanism for changing the orientation of the camera 210 (housing 110), and is driven by a servo motor.

  The dew condensation part 310 exists in the position where the air which passed the inner surface of glass contacts. The dew condensation part 310 may be a part of the lower side of the casing 110. Further, the temperature of this portion varies according to the outside air temperature. The heat source unit 320 includes a servo amplifier 321 for driving the mechanism unit 230 and a fan 322 for cooling the servo amplifier 321 (for moving the air heated by the servo amplifier 321). In addition, the heat source unit 320 is disposed on the upper side in the housing 110. Note that a fan 340 for supplying cold air to the heat source unit 320 side may be provided near the dew condensation unit 310. Moreover, air can be easily circulated by making the whole or part of the casing 110 spherical. Furthermore, if the groove portion 170 is provided near one end where the glass 140 of the cylindrical portion 112 is attached, the water generated by the condensation is transmitted to the glass 140 even when the camera stabilizer 100 takes a picture in the downward direction. I can prevent it.

  The hot wire 330 is arranged around the glass 140 and inside the duct part 160. The reason why the hot wire 330 is not disposed on the entire glass 140 is that, as described above, the high specification for the glass 140 is satisfied, and therefore, the heat wire cannot be disposed at a portion related to photographing. Moreover, the heat ray 330 in the duct part 160 may be warmed as a whole, or only the part close to the glass 140 may be warmed.

  In addition, the duct part 160 has the duct opening part 161 and the duct start part 162 (refer FIG. 6). The duct start portion 162 in the vicinity of the fan 322 is widened to take in the air warmed by the servo amplifier 321. Warmed air taken in at the duct start 162 moves through the duct 160 from the duct opening 161 along the inner surface of the glass 140. As shown in FIG. 5A, warm air is supplied from three directions by providing duct openings 161 on the upper side and the left and right sides of the glass 140, and the entire glass 140 may be warmed.

  According to the dew condensation prevention mechanism of the present invention, the servo amplifier 321 is disposed on the upper side in the housing 110, and the dew condensation part 310 is disposed on the lower side of the housing 110. That is, considering the state where there is no fan 322 (340), the cold air is in the vicinity of the dew condensation portion 310, that is, the air is further cooled if the outside air temperature decreases. Further, the warm air is heated near the servo amplifier 321, that is, further warmed. Since such air is circulated by the fan 322 (340), the strength of the fan is such that the lower the outside air temperature, the greater the difference between the outside air temperature and the temperature of the air moving along the inner surface of the glass. It is also possible to adjust. That is, it is possible to sufficiently condense and remove moisture, and to sufficiently warm the air and reduce the humidity. Therefore, even when the temperature change of the outside air is large, it is possible to prevent the condensation of the glass attached to the hermetic casing without enclosing the dry nitrogen. In an actual camera stabilizer, the strength of the fan may be appropriately designed based on the amount of heat generated by a heat source such as a servo amplifier, the size and shape of the housing, the area where the air and the dew condensing part are in contact, and the usage environment.

  In the case of a camera stabilizer, the housing is a sealed type, and the heat source (servo amplifier) is often arranged on the upper side. This is different from a camera housing for outdoor installation such as Patent Document 2. If the housing is an open type as in Patent Document 2, moisture taken out by dehumidification can be discharged. However, in the case of a sealed type, even if moisture is taken out by dehumidification, it cannot be discharged, so the absolute amount of moisture inside the housing cannot be changed in a short time. Moreover, if a heater is arrange | positioned below glass like patent document 2, the warmed air can also be moved naturally up. However, since the heat generation source is arranged on the upper side, it is difficult to adopt the same method. Such a point has made it difficult to prevent dew condensation along with severe temperature changes required for camera stabilizers. The present invention achieves the object by positively utilizing such characteristics of the camera stabilizer (being a hermetically sealed type and having a heat generation source disposed above). In addition, although the moisture taken out by the dew condensation part increases as the outside air temperature becomes lower, it becomes ice when the outside air temperature falls below the freezing point.

<Experiment>
FIG. 7 shows an image of the relationship between the temperature and humidity near the dew condensation part and near the inside of the glass of the dew condensation prevention mechanism of the present invention. The solid line in FIG. 7 indicates the temperature, and the dotted line indicates the humidity. (1) is when the camera stabilizer is not operated (no heat generation from the heat source) and is placed on the ground (initial state), (2) is when the sky is at a certain height (3 ) Shows the case of the sky above (2). In the case of (1), the temperature and humidity near the dew condensation part and near the inside of the glass are the same. In the sky as in (2) and (3), the outside air temperature decreases, and accordingly, the temperature near the dew condensation portion decreases below the dew point. However, the temperature near the inside of the glass does not drop much because it is sufficiently warmed by the heat source. Moreover, water can be sufficiently taken out at the dew condensation part. Therefore, when the outside air temperature decreases, the dew point near the inside of the glass can also be lowered, and condensation on the glass can be prevented. With this method, it is possible to sufficiently cool the air at the dew condensation part, so it is possible to increase the amount of moisture taken out, and depending on the design, the humidity near the inside of the glass can be lowered as the outside air temperature decreases It is.

  In order to confirm this, the initial state inside the housing was 30 ° C. and the humidity was 60%, the outside air temperature was changed from 30 ° C. to −20 ° C., and the temperature and humidity near the inside of the glass were examined. FIG. 8 shows the results. As can be seen from this result, the lower the outside air temperature, the greater the difference between the temperature of the inner surface of the glass and the outside air temperature. And the one where the outside air temperature is lower has lower humidity near the inside of the glass. From this experimental result, according to the dew condensation prevention mechanism of the present invention, the lower the outside air temperature, the larger the difference between the temperature of the inner surface of the glass and the outside air temperature. Therefore, even when used in an environment where the temperature changes drastically, the humidity in the vicinity of the inside of the glass can be reliably kept low, so that condensation can be prevented.

DESCRIPTION OF SYMBOLS 100 Camera stabilizer 110 Housing 111 Ball part 112 Tube part 120 Fixing part 130 Glass holding part 131, 132 Glass holding part 133 Heat insulating material 134 Sealing part 135 Screw 140 Glass 150 Support part 160 Duct part 161 Duct opening part 162 Duct start part 170 Groove part 210 Camera 220 Lens 230 Mechanism 310 Dew condensation 320 Heat source 321 Servo amplifier 322, 340 Fan 330 Heat rays

Claims (7)

A dew condensation prevention mechanism that prevents dew condensation on glass attached to a part of a sealed housing,
A heat source part that is arranged in the housing and includes a heat source that generates heat and a fan that moves the air heated by the heat source;
A duct part that guides the air heated by the heat source part to the position of the glass and moves the air heated along the inner surface of the glass;
A part of the inside of the housing that comes into contact with the air that has passed through the inner surface of the glass, and a temperature of the part varies according to the outside air temperature, and a dew condensation part,
The dew condensation prevention mechanism, wherein the heat source is disposed on an upper side of the housing, and the dew condensation part is disposed on a lower side of the housing. Condensation prevention mechanism for a camera stabilizer, comprising: a sealed housing partially attached with glass; a camera disposed in the housing; and a mechanism for changing the orientation of the camera,
A servo amplifier for driving the mechanism unit, and a heat source unit including a fan for cooling the servo amplifier,
A duct part that guides the air heated by the heat source part to the position of the glass and moves the air heated along the inner surface of the glass;
A part of the inside of the housing that comes into contact with the air that has passed through the inner surface of the glass, and a temperature of the part varies according to the outside air temperature, and a dew condensation part,
The dew condensation prevention mechanism, wherein the servo amplifier is disposed on an upper side of the housing, and the dew condensation portion is disposed on a lower side of the housing. The dew condensation prevention mechanism according to claim 1 or 2,
A dew condensation prevention mechanism comprising a heat ray around the glass and inside the duct part. The dew condensation prevention mechanism according to any one of claims 1 to 3,
The dew condensation prevention mechanism, wherein the strength of the fan is adjusted so that the difference between the temperature of the air moving along the inner surface of the glass and the outside air temperature increases as the outside air temperature decreases. . The dew condensation prevention mechanism according to any one of claims 1 to 4,
The housing is
A sphere having a spherical shape and including the heat source and the dew condensation;
A dew condensation prevention mechanism, comprising: a cylindrical part having a cylindrical end attached to a part of the spherical part and the glass attached to the other end of the cylindrical part. The dew condensation prevention mechanism according to any one of claims 1 to 5,
The duct part is
A dew condensation prevention mechanism characterized in that air is supplied to at least the inner surface of the glass from three directions. The dew condensation prevention mechanism according to any one of claims 1 to 6,
A dew condensation prevention mechanism comprising a fan that moves air cooled by the dew condensation unit.

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