JPS6396643A - Water-proof camera - Google Patents

Abstract

PURPOSE:To simplify the constitution of a water-proof camera and to reduce its size and to improve the water-proof reliability by using a packing which has projections in a connecting direction and a direction perpendicular to it. CONSTITUTION:The water-proof packing 23 is interposed between joining stage parts 21a and 22a of the front and rear external covers 21 and 22 of a cover which is divided into the two bodies. This packing 23 is provided with a thrust- directional projection part 23a in the connection direction and a radial projection 23b perpendicular to it, and prevention in the orthogonal directions is attained by one packing without increasing the thickness of the cover. Consequently, the constitution is simplified to reduce the size of the water-proof camera and improve the water-proof reliability.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a waterproof camera, and particularly to a waterproof mechanism at the outer cover joint of a waterproof camera having a structure in which the outer cover is divided into two or more parts. It is.

<Prior Art> Conventionally, most waterproof mechanisms for cameras of this type have used an O-ring as a waterproof gasket.

There are two types of methods for this waterproofing mechanism: (5) a method of crushing the waterproof packing in a thrust direction relative to the joining direction, and (B) a method of crushing the waterproof packing in a radial direction relative to the joining direction.

(5) Regarding the method, - As an example, as shown in Part 3, a waterproof gasket (OIJ song 3) fitted into the recess 1b provided on the rear end surface of the front cover 1 is provided on the front end surface of the rear cover 2. The front cover 1 and the rear cover 2 are joined together by being crushed by the convex portion 2a, thereby achieving waterproofing.

(As for the leveling method, as an example, as shown in FIG. When fitting and joining the rear end step portion 11a and the front end step portion 12a of the rear cover 12, the front cover 1
Waterproofing is achieved by crushing the inner surface of the rear end step portion 11a in the direction perpendicular to the rear end step portion 11a.

<Problems to be Solved by the Invention> By the way, in the installation method described above, in order to obtain waterproof reliability, the convex portion 2a of the rear cover 2 is attached to the waterproof gasket 3.
Since it is necessary to crush 20 to 30% of its diameter, the flat surface of the tip of the convex portion 2a of the rear cover 2! It requires high precision and assembly precision, which has the drawback of increasing costs. Furthermore, since the crushed waterproof gasket 3 exerts a force that tends to bend outward the both projecting edges 1a formed by the recess 1b of the front cover 1, it is necessary to ensure that the projecting edges 1a are sufficiently thick. As a result, there is a drawback that the front cover 1 becomes thicker, leading to an increase in the size of the camera. Furthermore, since the waterproof gasket 3 must be crushed around the entire circumference of the cover, the force required to attach the front cover 1 and the rear cover 2 increases, the number of attachment screws must be increased, and the dead space increases. There is a drawback.

On the other hand, in the method (B), the front cover 11
The inner surface of the rear end step portion 11a receives an outward force (upward in the figure) due to the reaction force of the waterproof gasket 13, and the recess 12b of the rear cover 12 also receives an inward force (downward in the figure). Therefore, in order to obtain waterproof reliability, the front cover 1
1 and the front end step 12 of the rear cover 12.
It is necessary to take measures to suppress these deformations by making the wall of a thicker, but this also has the disadvantage of causing an increase in the front and rear forces and the wall thickness of <-, as in the case of method (5).

SUMMARY OF THE INVENTION An object of the present invention is to provide a waterproof camera that eliminates the drawbacks of the conventional example, is more compact, and has improved waterproof reliability.

<Means for Solving the Problems> The configuration of the present invention for achieving the above-mentioned object will be explained using FIG. 1 corresponding to an embodiment.

The present invention provides an outer cover 2 that is divided into at least two parts.
1.22, the divided external force, N+-21,2
A packing 23 for waterproofing is interposed between the joint step portions 21a and 22a of the two, and the packing 23 has protrusions 23a and 23b in two directions, the joining direction and the direction perpendicular thereto, and is connected to one of the outer nuclear covers 21. Pressure contact surface 21b.

21C, waterproofing is performed in both the thrust direction and the radial direction.

<Function> When assembling the outer cover, attach the outer cover 21.22i using the mounting screws (not shown) and the waterproof gasket 23
The protrusion 23a in the thrust direction contacts the pressure contact surface 21b of the outer cover 21 and causes deformation.

Then, the radial side surface of the waterproof gasket 23 bulges due to the deformation of the protrusion 23a, and the radial protrusion 23b comes into contact with the pressure contact surface 21C of the joint step 21a of the outer cover 21, closing the gap therebetween. When the outer covers 21 and 22 are removed and the outer covers 21 and 22 are finally attached, the internal pressure in the space formed between the outer cover 21 and the waterproof gasket 23 increases.

Therefore, if the camera is subjected to water pressure, etc., the outer cover 2
Even if water that enters the gap between 1 and the outer cover 22 reaches the protrusion 23b of the waterproof gasket 23, the internal pressure of the space forces the protrusion 23b of the waterproof gasket 23 in a direction that resists the water pressure, making it waterproof. reliability can be improved.

<Example> Hereinafter, an example of the present invention will be described based on FIG. 1.

Reference numeral 21 denotes a front outer cover, which has a joint step 21a at its rear end, and forms a pressure contact surface 21b in the thrust direction and a pressure contact surface 21C in the radial direction that come into contact with the waterproof gasket 23. Reference numeral 22 denotes a rear outer cover, which has a joint step 22a at its front end, and the waterproof gasket 23 is attached to the outer peripheral surface of the joint step 22a. The waterproof gasket 23 has a band shape and has a protrusion 23a in the thrust direction and a protrusion 23b in the radial direction.

Therefore, when the front outer cover 21 and the rear outer cover 22 are attached using mounting screws (not shown) so as to engage the joint step part 21a of the front outer cover 21 and the joint step part 22a of the rear outer cover 22, the waterproof The protrusion 23a of the gasket 23 in the thrust direction is in contact with the pressure contact surface 21 of the front outer cover 21.
b and causes deformation, and this deformation of the protrusion 23a causes a bulge on the radial side surface of the waterproof gasket 23.

As a result, the radial protrusion 2 of the waterproof gasket 23
3b generates a force that pushes up the pressure contact surface 21C of the front outer cover 21 outward (upward in the figure).

If the amount of crushing at the protrusion 23b in the radial direction of the waterproof gasket 23 becomes more than necessary due to errors in dimensional accuracy or assembly accuracy, the stress at the protrusion 23b will be dispersed at the joint step 21a of the front outer cover 21. do. Conversely, if there is a gap between the protrusion 23b of the waterproof gasket 23 and the pressure contact surface 21C of the front outer cover 21, the gap is closed by the swell of the protrusion 23b.

Therefore, when the front outer cover 21 and the rear outer cover 22 are tightened with the mounting screws to the final mounting position, the space 24 formed between the joining step 21a of the outer cover 21 and the waterproof gasket 23 is closed. Internal pressure is rising.

In this embodiment having the above-described configuration, when water pressure such as tap water is applied, the almost perpendicularly bent portion of the gap 25 between the front outer cover 21 and the rear outer cover 22 The water pressure decreases and reaches the protrusion 23b of the waterproof cover 23, but the internal pressure of the space 24 forces the protrusion 23b of the waterproof gasket 23 in a direction that resists the water pressure, so the reliability of waterproofing is maintained. Ru.

Next, when subjected to hydrostatic pressure such as being immersed in water, the water that reaches the protrusion 23b of the waterproof gasket 23 is urged in a direction that resists the water pressure, as described above. Since the joint step portion 21a of the front outer cover 21 is bent inward (downward in the figure) by water pressure and the internal pressure of the space 24 is increased, waterproof protection is maintained.

Furthermore, if waterproofing in the radial direction is impossible due to damage to the waterproof gasket, for example, water that has entered the space 24 will be sufficiently crushed by the cover mounting screw (not shown) on the protrusion 23a of the waterproof gasket 23 in the thrust direction. Therefore, it is blocked by the protrusion 23a, and the inside of the camera body can be completely waterproofed.

FIG. 2 shows another embodiment of the invention.

In order to simplify the explanation, parts having the same functions as those in the embodiment shown in FIG. 1 are given the same reference numerals, and only the differences will be explained.

In this embodiment, the waterproof gasket 23 is formed to have a U-shaped cross section, and is attached by fitting into the joint step 22a of the rear outer cover 22. When assembling the outer cover 21 and the rear outer cover 22,
This prevents the waterproof gasket 23 from peeling off from the attachment surface of the rear outer cover 22 and facilitates assembly. The other configurations are exactly the same as those of the previous embodiment.

It goes without saying that in each of the above embodiments, the structural relationship between the front outer cover 21 and the rear outer cover 22 may be reversed.

<Effects of the Invention> As explained above, the present invention improves the reliability of waterproofing compared to the case where waterproofing is performed only in a single radial or thrust direction, and does not require as much precision in parts and assembly. The production costs are also reduced, and the thickness of the outer cover can be made thinner, making it possible to make the camera more compact.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a main part of an embodiment of a waterproof camera according to the present invention, FIG. 2 is a cross-sectional view of a main part of another embodiment of the present invention, and FIGS. 3 and 4 are waterproof cameras of a conventional example. It is a sectional view of the main part of the camera. 21... Front outer cover, 21a... Joint step, 21
b... Pressure contact surface in the thrust direction, 21C... Pressure contact surface in the radial direction, 22... Rear outer cover, 22a...
Joint step, 23...Waterproof gasket, 23a...Protrusion in the thrust direction, 23b...Protrusion in the radial direction Fig. 1, Fig. 2, Fig. 3b 21 Front external force 1 (-210 Prayer step 21b Slash + direction loaf 11 Koma 21c Radial direction Φ pressure camphor plane 22 1'Toon 97tn) Gu- 23, 'i1 Hoei lg1. Kin 230 Suramito (ro)'s 9J multi-layer p23b ・Radaa 1 Shitsuraishih has, gi' door 3 Figure 4 Figure 1a

Claims (1)

[Claims] 1 Consisting of an outer cover divided into at least two parts, a waterproof packing for waterproofing is interposed at the joining step of the divided outer cover, and the waterproof packing protrudes in two directions: the joining direction and the direction perpendicular to the joining direction. What is claimed is: 1. A waterproof camera, characterized in that the waterproof camera has a pressure contact surface with one of the outer covers and is waterproof in both the thrust direction and the radial direction.