JPS6020260B2 - Anti-fog device for transparent windows in waterproof cases - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an anti-fog device in which a transparent window in a waterproof case prevents fogging caused by fogging of moisture contained in the air inside the waterproof case.

Originally, a waterproof case would not hold water even if you put it in the water along with other items stored inside the waterproof case, such as a camera or a radio.
Since the purpose is to prevent the stored items from getting wet, it is constructed to be watertight.

If you look at it mechanically, it is natural that something that is configured to be watertight like this is airtight. When storing items in a waterproof case, it is done in the outside air, so when the waterproof case is sealed, the outside air will enter the waterproof case, and the humidity of this outside air will be reduced. It is impossible to reduce the temperature to zero, and if a sealed waterproof case is placed in water or air at low temperatures, fog will form inside the waterproof case.

On the other hand, waterproof cases for cameras, radios, etc. require a transparent window facing the objective lens of the stored camera for taking pictures, and radios, etc. require a transparent window to read the display. It is something.

When the above-mentioned condensation occurs on this transparent window, the transparent window becomes cloudy,
It is virtually impossible to use the internal contents. The purpose of the present invention is to prevent fogging caused by fog condensation on the transparent window in a waterproof case having a transparent window. The waterproof case is characterized in that a heat conductive member having good thermal conductivity is provided through the inside and outside of the waterproof case, and the heat conductive member in the waterproof case is provided with an appropriately shaped air contact surface. When the outside of the waterproof case is cooled, the water vapor contained in the air inside the waterproof case is atomized onto the air contact surface of the heat conductive part in the waterproof case, and this condenses to the transparent material with poor thermal conductivity. This invention relates to a cloud-proofing device for a transparent window in a waterproof case intended to prevent the formation of fog.

One embodiment of the present invention will be described in detail regarding the waterproof case for a camera shown in the drawings. Fig. 1 is a partially cutaway top view of the above embodiment, and arrow A indicates the front thereof.

The waterproof case consists of two components: an pupil body 2 and a lid body 3, in which the camera 1 is housed. As shown in FIG. 2 (vertical rear view of the cliff body) and FIG. 3 (vertical cross-sectional side view of the waterproof case), they are firmly tightened at four locations around the periphery using vertical screws 5 to become one piece. The camera 1 inside the waterproof case is fixed by support shelves 2b and 3b inside the waterproof case. An operation member for performing each operation of the camera 1, that is, a focus adjustment member 6 shown in FIG.
The diaphragm adjustment member 7, the shirt button 8, and the winding operation member 9 shown in FIG.
1. It is connected to an external shirt stopper nail 12, an external hoisting operation member 13 shown in FIG. 2, etc., and can be operated from the outside even underwater.

However, the focus adjustment member 6 and the aperture adjustment member 7 need to be positioned in advance so that they engage with the respective fork-shaped coupling members 14 and 15 when the camera 1 is housed in the waterproof case. It is. The coupling members 14, 15 are mated to threaded portions 16a, 17a of the rotating shafts 16, 17, and the rotating shafts 16, 17 are connected to the respective external operating members 10, 11. By rotating with respect to the waterproof case, the coupling members 14 and 15 are slid from side to side, and the focus adjustment member 6 or diaphragm adjustment member 7 of the camera 1 is moved and operated.
Note that if the configuration is such that the operating members 6 and 7 of the camera can be operated by the connecting members 14 and 15 screwed together as described above, it is configured such that some urging force is applied to the operating members 6 and 7 on the camera 1 side. It is possible to maintain a certain set of counterfeits against the biasing force even if the

The camera shirt flap 8 is operated via a lever 19 by pushing the external shirt flap button 12 downward against the spring 18 and rotating its shaft 20 clockwise.

The hoisting operation member 9 shown in FIG. The mechanism is such that it is pushed to the left via a lever 22 fixed to the lever 22 to charge the jacket and wind the film. In order to prevent water from entering the case from the joints between the waterproof case and the cover shafts 16, 17, 20, 21, on which the external operating members of the waterproof case are fixed, each shaft is provided with packing. Rubber O-ring 24,2
5, 26, and 27 are arranged.

A transparent window is formed in the waterproof case at a portion facing the photographing lens 37 of the camera, and a glass 28 is particularly fitted with iron to the window.

Of course, it is also possible to integrally mold this with the same synthetic resin as the lid 3 of the waterproof case, as in the other embodiment shown in FIG. Glass 28 was particularly used because glass has superior optical properties in various respects compared to synthetic resins. This glass 28 is in the form of a thin plate, and generally speaking, glass has a relatively high thermal conductivity compared to synthetic resin, so when the cold air or water temperature outside cools down, the inner surface of the glass 28 will be exposed to other lids. Water vapor contained in the air inside the waterproof case, which is cooled further than 3, tends to create streaks on the inner surface of the glass, which tends to cause fogging. In order to prevent this, the mounting ring 29 for attaching the glass 28 to the lid body 3 is made of a material with sufficient heat conductivity compared to the glass 28, such as aluminum or coins. This is passed through the inside and outside of the waterproof case.

That is, the holding attachment ring 29 is iron-fitted within the inner mating portion 3c of the lid body 3 via the packing rubber 31, and the glass 28 is sandwiched between the packing rubbers 32 and 33, and the outer surface of the holding ring 29 is held down by the attachment ring 30. are screwed together using threaded portions 29a and 30a. Both mounting rings 29, 30 above
The retaining mounting ring 301 has an air contact surface 34 large enough to come into contact with the outside air, and the holding mounting ring 29 has an air contact surface 35 wide enough to come into contact with the outside air. An air contact surface 36 is formed that is wide enough to come into contact with the air inside the waterproof case. Therefore, when the waterproof case is sealed and placed in cold air, the cold air from the outside is transmitted through both rings 29, 30 to the air contact surface 36 inside the waterproof case, which is farther than the glass 28, and the waterproof case The water vapor contained in the air inside is atomized to prevent it from forming a path to the inner surface of the glass 28.

FIG. 4 shows an embodiment in which the transparent window is made of the same synthetic resin as the lid, and the portion of the lid 3 that faces the photographing lens 37 of the camera is a transparent thin plate-like portion 28, and the surrounding area is further expanded. A large number of arcuate pieces 30' made of aluminum or brass, as described above, which have higher thermal conductivity than the synthetic resin, are embedded and molded in a ring shape.

The reason for forming an arc piece instead of a ring is to form a notch 38 for forming an oil opening when casting into synthetic resin. The arc piece 30' has an air contacting surface 35 of sufficient width on the outer surface of the lid 3 and an air contacting surface 36 of sufficient width on the inner surface of the lid 3, so that the outside air of the waterproof case is formed. When rapidly cooled, the water vapor contained in the air inside the waterproof case condenses on the inner air contact surface 36, thereby preventing the transparent window portion 28 from fogging up.

In the present invention, even if the waterproof case is cooled by being sealed and immersed in water as described above, the water vapor contained in the air inside the waterproof case has a higher thermal conductivity than the transparent window. A good waterproof case will prevent condensation from condensing on the parts that penetrate inside and outside the case, and condensing on the transparent window of the waterproof case that faces the display or camera lens of a camera or radio stored inside the case, causing it to fog up. This has a special effect of preventing the above-mentioned conditions and allowing the storage section to operate in the same manner as in the outside air.

[Brief explanation of the drawing]

The drawings show an embodiment according to the present invention, and FIG. 1 is a partially cutaway top view of the first embodiment, FIG. 2 is a longitudinal sectional rear view of the same embodiment, and FIG. 3 is a longitudinal sectional view of the same embodiment. It is a side view and the fourth
The figure is a perspective view of a lid of another embodiment. 2... Land body (second constituent body), 3... Lid body (first constituent body), 28, 28'... Transparent window,
29, 30, 30'... Heat conductive member, 34, 3
5, 36...Air contact surface. Hole 3 Diagram Hole 4 Diagram × Diagram N Pu

Claims (1)

[Claims] 1. Consisting of a first and a second structure for forming a watertight space for storing small devices such as cameras and radios, at least the first structure is made of a synthetic resin material, In a waterproof case in which a transparent window made of a transparent material is formed in a part thereof, a heat conductive member having better thermal conductivity than the transparent material is placed near the transparent window so as to communicate between the inside and outside of the waterproof case. An anti-fog device for a transparent window in a waterproof case, characterized in that: 2. An anti-fogging device for a transparent window in a waterproof case according to claim 1, wherein the heat conductive member is disposed to surround the transparent window. 3. The anti-fogging device for a transparent window in a waterproof case according to claim 2, wherein the portion of the heat conductive member facing inside the waterproof case is formed into a flat plate shape to increase the contact area with air.