JPH11190881A - Camera and camera accessory - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of the stoppage of air inflow.outf1ow caused by drops of water by forming an air ventilation section having breeze holes on the bottom surface of a camera body and covering the holes with the filter which passes air but, does not pass water. SOLUTION: An air ventilation section 21 is provided on a camera bottom cover 22 which constitutes of the bottom surface of a camera body. A breeze hole supporting section 29, which is projected (withdrawn) while a prescribed part is directed to the top, is integrally formed with the cover 22. Breeze holes 23 are formed in scattered plural parts on the section 29 to balance the air pressure of the inside and the outside of the camera body. A filter 24, which passes air but, does not pass water, is installed along the flat surface of the bottom of the section 29 to cover the holes 23. The filter 24 is sandwitched and fixed by the section 29 and a filter pressing frame 26 which has a through- hole 25 that has an approximately same shape of the peripheral of the projected section of the section 29.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drip-proof / waterproof camera of a water-proof type having a watertight camera body, and more particularly to a drip-proof / waterproof camera capable of attaching accessories to the camera body.
Related to waterproof cameras.

[0002]

2. Description of the Related Art Conventionally, as a technique for avoiding an increase or decrease in an operation force due to a change in volume inside a camera body due to zooming of a zoom lens or the like while forming the camera body in a watertight state, for example, Japanese Utility Model Laid-Open No. 3-86338. It is proposed in the gazette.

Here, the technique proposed in this publication will be described. As shown in FIG. 4A, a lens barrel 2 is mounted on the front surface of the camera body 1, and this lens barrel 2 is moved in the optical axis direction by operating a zoom switch 3 installed on the upper surface of the camera body 1. Go back and forth for zooming.

[0004] The volume inside the camera body 1 changes as the lens barrel 2 advances and retreats. Therefore, as shown in FIGS. 4B and 5, a filter support portion 5 is formed on the wall surface 4 on the front surface of the camera body 1 so as to project a predetermined portion in a curved shape so as to project forward. Have been. Breeze holes 6 for communicating the inside and outside of the camera body 1 and balancing the air pressure inside and outside are formed at four places in the filter supporting portion 5 in a dispersed manner. As shown in FIG. 5, on the front surface of the filter supporting portion 5, a gas-permeable and water-impermeable filter 7 covering the four breathing holes 6 is mounted along the curved surface of the filter supporting portion 5.

[0005] Since the breathing holes 6 are dispersed at four locations and are formed small, it is possible to reduce the change in shape of the air-permeable and water-impermeable filter 7 when air flows in and out. Further, a protective cover 8 is provided in front of the filter support 5 and the air-impermeable and water-impermeable filter 7.
The protective cover 8 has a large number of communication grooves 9 formed on the outer periphery thereof. The communication grooves 9 allow the air-permeable and water-impermeable filter 7 to come into contact with the outside air, and at the same time, damage and damage the air-permeable and water-impermeable filter 7. Protects against contamination, clogging.

[0006]

However, according to the above-described structure, as shown in FIG. 6, the filter support 5 having the breathe hole 6 protrudes from the front wall surface 4 of the camera body 1, so that the camera is normally used. When water is used, water droplets easily enter from a large number of communication grooves 9 formed in the protective cover 8 along a path A → B → C. Since the gap between the protective cover 8 and the curved top 10 of the air-impermeable and water-impermeable filter 7 decreases in the direction in which the water droplets travel, the water droplets that have entered tend to stagnate in the vicinity.
Therefore, the air-impermeable and water-impermeable filter 7 may be covered with water droplets, making it impossible for air to flow in and out.

Further, since the protective cover 8 covering the air-impermeable and water-impermeable filter 7 protrudes from the front wall surface 4 of the camera body 1, the finger of the photographer holding the camera body 1 holds the protective cover when photographing the camera. In the case of No. 8, there is a problem that the photographer feels strange.

[0008]

In order to solve the above-mentioned problems, according to the present invention, a ventilation portion having a breathe hole for communicating the inside and outside of the camera body is formed on the lower surface of the camera body, and the breathe hole is ventilated. Covered by impermeable filter.

That is, by forming a ventilation portion on the lower surface of the camera body in which the water drops immediately fall even when the water drops are applied in a normal use state, it is possible to avoid the possibility that the inflow / outflow of the air due to the water drops becomes impossible. ing.

It is desirable to form the ventilation portion at a position retracted from the lower surface of the camera body to the inside of the body so that the ventilation portion does not protrude to the outside, so that an uncomfortable feeling at the time of photographing can be eliminated.

When the lower surface of the camera body has a mounting area on which a camera accessory can be mounted, a ventilation section is formed in the mounting area so that water drops are less likely to be applied to the ventilation section in a normal use state. Is preferred.

In this case, the camera body may be provided with a convex portion that contacts the mounted camera accessory to form a gap between the ventilation portion and the accessory, or the camera accessory may be provided in the mounting area on the camera side. Even if water drops enter the ventilation section, the water drops stagnate in the ventilation section and hinder the inflow and outflow of air by providing a convex portion that forms a gap between the ventilation section and the ventilation section. It is desirable to ensure that this is done.

Further, a frame-like holding member for detachably mounting the air-impermeable water-permeable filter is provided in the air-permeable portion, so that even if the filter is damaged, damaged, stained or clogged, it can be easily removed. It is desirable to be able to exchange.

In addition, the configuration in which the ventilation non-water-permeable filter is sandwiched by the pressing members makes it possible to suppress a change in shape of the ventilation non-water-permeable filter due to the inflow and outflow of air in the ventilation part. In this case, the strength can be further improved by increasing the thickness of the filter.

[0015]

(First Embodiment) FIG. 1 shows a state in which a camera accessory is mounted on a camera according to a first embodiment of the present invention. In this figure, a camera body 12 is formed in a water-tight manner, and a detachable zoom lens 13 which is movable in the optical axis direction is mounted on a front surface of the camera body 12.

On the lower surface of the camera body 12 (in this embodiment, almost the entire lower surface is an accessory mounting area), an accessory (for example, an accessory that can be attached and detached from below to perform vertical position shooting and increase frame speed) is provided. Power drive
Booster) is installed. The camera body 1
A plurality of projections 19 are formed on the lower surface of the camera body 2, and thereby a joint surface 18 between the camera body 12 and the accessory 14 is formed.
Is formed with a predetermined amount of gap 20.

The zoom lens 13 is advanced and retracted in the optical axis direction by a half-press operation of a release button A15 provided on the upper surface of the camera body 12 and a release button B16 provided below the grip 17 of the accessory 14, so that zooming is performed. Do. At this time, the volume in the camera body 12 changes.

Therefore, the camera bottom cover 22 constituting the lower surface of the camera body 12 is provided with the zoom lens 1 in front view.
The ventilation part 21 is provided at a position substantially below the third part 3. Here, the configuration of the ventilation section 21 will be described in detail with reference to FIG. The camera bottom cover 22 is formed integrally with the camera bottom cover 22 with a breeze hole support portion 29 that projects (retreats) a predetermined portion upward (inward of the camera body).
The breeze hole support portion 29 allows the inside and outside of the camera body 12 to communicate with each other and balances the inside and outside air pressure.
Are dispersedly formed at a plurality of locations.

On the lower surface of the breathing hole support portion 29, a gas-permeable and water-impermeable filter 24 is provided so as to cover the plurality of breathing holes 23.
Are mounted along the plane of the breathing hole support portion 29. The air-impermeable and water-impermeable filter 24 is connected to the breathing hole support 2.
9 and a filter holding frame (holding member) 26 having a through hole 25 having substantially the same shape as the outer periphery of the protruding portion of the breeze hole supporting portion 29. The filter holding frame 26 is detachably fixed to the camera bottom cover 22 with screws 27.

When the camera is constructed as described above, the joint surface 18 between the camera body 12 and the accessory 14 is originally a place where water droplets hardly penetrate and water droplets are unlikely to be applied. , Ventilation section 21
There is almost no risk of being clogged by water drops. In addition, since a predetermined amount of the gap 20 is formed on the joint surface 18 where the ventilation portion 21 is formed by the convex portion 19, even if the water droplet enters here, the water droplet stagnates and air flows in.・ A situation where outflow is impossible can be avoided.

Therefore, when the zoom lens 13 is moved forward and backward in the optical axis direction of the camera body 12, air corresponding to the amount of change in the internal volume of the camera body 12 is passed through the ventilation section 21.
Through the please hole 23. Therefore, the operation force for moving the zoom lens 13 forward and backward does not fluctuate due to changes in the internal pressure in the camera body 12 and the zoom lens 13.

Also, since the breathing holes 23 are dispersed in a plurality of places in the ventilation part 21 and each is formed small,
Generation of abnormal noise due to a change in the shape of the air-permeable and water-impermeable filter 24 when air flows in and out can be suppressed as much as possible, and deterioration can hardly occur. In the present embodiment, the projection 19 is formed on the lower surface of the camera body 21 so that the bonding surface 18 is formed.
Although the case where the gap 20 is formed is described above, a gap may be formed on the joint surface by forming a convex portion on the upper surface of the accessory 14 and making it contact the lower surface of the camera body 21. .

(Second Embodiment) FIG. 3 shows a second embodiment of the present invention.
2 shows a configuration of a ventilation section 21 of the camera according to the embodiment. Since the basic configuration of the present embodiment is the same as that of the first embodiment, the same components as those of the first embodiment are denoted by the same reference numerals and description thereof will be omitted.

In the present embodiment, a plurality of through holes 28 are provided at positions corresponding to the plurality of breathe holes 23 in the filter holding frame 26 'sandwiching the air-impermeable and water impermeable filter 24.
Is formed. Thereby, compared to the case where the air-permeable and water-impermeable filter 24 is sandwiched by the filter holding frame 26 of the first embodiment, it is possible to reliably prevent deformation of the filter 24, particularly near the center of the filter 24, due to the ingress and egress of air in the ventilation part 21. .

[0025]

As described above, according to the present invention,
In a normal use state, the ventilation part is formed on the lower surface of the camera body where the water drops immediately fall even if the water drops are applied, so that it is possible to avoid the possibility that the inflow / outflow of the air becomes impossible due to the water drops.

If the ventilation section is formed at a position retracted from the lower surface of the camera body to the inside of the camera body, the projection of the ventilation section to the outside can be eliminated, and the sense of discomfort at the time of photographing can be eliminated.

Further, in the case where the camera body has a mounting area on the lower surface of the camera body where a camera accessory can be mounted, if a ventilation section is formed in this mounting area, it is possible to prevent water drops from being easily applied to the ventilation section in a normal use state. Can be.

In this case, the camera body may be provided with a convex portion which abuts on the mounted camera accessory to form a gap between the ventilation portion and the accessory, or the camera accessory may be provided in a mounting area on the camera side. By providing a convex portion that forms a gap between the contact portion and the ventilation portion, even if a water droplet enters the ventilation portion, the water droplet stagnates in the ventilation portion and the inflow / outflow of air is hindered. Can be reliably avoided.

In addition, if the ventilation portion is provided with a holding member for detachably mounting the air-impermeable and water-impermeable filter, even if the filter is damaged, damaged, stained, or clogged, it can be easily replaced. In addition, if the air-impermeable filter is sandwiched by the pressing members, it is possible to suppress a change in the shape of the air-impermeable filter due to the ingress and egress of air in the air-permeable portion.

[Brief description of the drawings]

FIG. 1 is a front view showing a state in which accessories are mounted on a camera according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a ventilation section of the camera.

FIG. 3 is a sectional view of a ventilation part of a camera according to a second embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a configuration of a conventional camera.

FIG. 5 is a cross-sectional view showing a ventilation section of a conventional camera.

FIG. 6 is a cross-sectional view showing a state in which water droplets have stagnated in a ventilation part of a conventional camera.

[Explanation of symbols]

1 Camera body 2 Lens barrel 3 Zoom switch 4 Wall 5 Filter support 6 Breeze hole 7 ···· Ventilation-impermeable filter 8 ··· Protective cover 9 ··· Communication groove 10 ··· Curved surface top 11 ··· Gap 12 ··· Camera body 13 ····· Zoom lens 14 ···· Accessories 15 and 16 ···· Release button
1 17 Grip 18 Joining surface 19 Convex 20 Gap 21 Vent section 22 Camera bottom lid 23 ································································································ Through-hole 29 ····· Breeze hole support parts A to C ··· Drip path

Claims (7)

[Claims] 1. A camera, wherein a ventilation portion having a breathe hole communicating between the inside and outside of the camera body is formed on a lower surface of the camera body, and the breathe hole is covered with a ventilation and water-impermeable filter. 2. The camera according to claim 1, wherein the ventilation portion is formed at a position retracted inward from the lower surface of the camera body. 3. The camera according to claim 1, wherein the camera body has a mounting area in which a camera accessory can be mounted on a lower surface of the camera body, wherein the ventilation portion is provided in the mounting area. . 4. The camera according to claim 1, wherein a plurality of the breathing holes are formed in the ventilation section. 5. The camera according to claim 1, wherein a holding member for detachably attaching the air-permeable and water-impermeable filter is provided in the ventilation section. 6. The camera according to claim 3, wherein a projection is provided in the mounting area to contact the mounted camera accessory and form a gap between the ventilation section and the accessory. 7. The camera according to any one of 6. 7. A camera accessory that can be mounted in the mounting area in the camera according to claim 3, wherein the camera accessory is in contact with the mounting area when the camera is mounted in the mounting area and a gap is formed between the camera and the ventilation section. An accessory for a camera, comprising: a convex portion that forms