JPH06186624A - Lens barrel attaching structure - Google Patents

Abstract

PURPOSE:To provide a coupling means having no sliding resistance while keeping water proofing ability between the fixed barrel of a lens barrel and the lens holding frame thereof which can move forward and backward. CONSTITUTION:Domestic water-proof is applied to a camera main body 1. As to the fixed barrel 2 for an interchangeable lens, an O-ring 3 is provided an a mounting part so that water is prevented from infiltrating at the time of mounting the interchangeable lens. The lens holding frame 4 constituting the lens barrel holds a photographing lens 6 by caulking or adhesion so as to keep the water proofing ability. After a flexible cylindrical waterproof sheet 7 is followed at a middle part in a state where its one end is fixed to the fixed barrel so as to keep the water proofing ability, its other end is fixed to the lens holding frame 4 in the same manner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof camera for daily life, and more particularly to waterproofing of a lens barrel that moves in the optical axis direction in the camera.

[0002]

2. Description of the Related Art FIG. 6 is a side sectional view showing a state in which a lens barrel of a conventional camera is pulled out, and FIG.
FIG. 7 is a side sectional view showing a state where the lens barrel is housed in the state of FIG. 6.

6 and 7, in the conventional camera, a lens barrel including a lens holding frame 34 for holding a taking lens 36 is a fixed barrel 37 of a camera body (camera body) 31.
Was attached to. The mounting structure is such that the lens barrel including the lens holding frame 34 that moves in the optical axis direction and the fixed barrel 3
It was general that an O-ring 38 made of rubber or the like was placed between Nos. 7 and 7 to prevent water from entering.

[0004]

However, in the conventional structure in which the O-ring prevents water from entering, the lens barrel and the O-ring are not provided.
There was a problem that the sliding resistance of the ring was large. In particular,
In recent years, cameras have become more automated, and many of them have a lens barrel driven by a motor, such as autofocus and autozoom, and the sliding resistance increases due to the O-ring provided for waterproofing life as described above. Is a decrease in drive speed,
This was a problem because the battery was consumed.

The present invention has been made in order to solve such a conventional problem, and provides a lens barrel mounting structure which maintains airtightness, has a small sliding resistance, and can drive the lens barrel smoothly and quickly. The purpose is to do.

[0006]

In order to achieve the above object, the lens barrel mounting structure of the present invention is characterized in that, in claim 1, the fixed barrel and the lens holding frame have watertightness and ventilation. Connected through a flexible cylindrical waterproof sheet, and the waterproof sheet is arranged in the lens barrel so that the folded-back portion advances and retracts with respect to the forward and backward movement of the lens holding frame in the optical axis direction. The structure according to claim 2, wherein the waterproof sheet has frames at both ends, and the frames are detachably held by the fixed barrel and the lens holding frame, respectively. In the above, the waterproof sheet is formed in a tapered shape, and has a configuration in which the bent portion of the waterproof sheet can smoothly move forward and backward with respect to the forward and backward movement of the lens holding frame.

[0007]

According to the present invention, the O of the sliding portion is used as a means for waterproofing life.
The ring is eliminated, and one end of the flexible cylindrical waterproof sheet is connected to the movable lens barrel and the other end is connected to the fixed lens barrel to prevent water from entering.

[0008]

1 is a side sectional view showing a state in which a lens barrel is pulled out in a camera according to an embodiment of the present invention, and FIG. 2 is a side showing a state in which the lens barrel of FIG. 1 is stored. FIG.

In FIGS. 1 and 2, reference numeral 1 denotes a camera body, which is waterproof. Reference numeral 2 denotes a fixed barrel of the interchangeable lens, which is provided with an O-ring 3 at the mount portion to prevent water from entering when the interchangeable lens is attached. Reference numeral 4 denotes a lens holding frame which constitutes a lens barrel, and holds the taking lens 6 by caulking or adhering to maintain waterproofness. Reference numeral 7 denotes a flexible cylindrical waterproof sheet, one end of which is fixed to a fixed cylinder so as to keep the waterproof property, and after being folded back at an intermediate portion, the other end is similarly fixed to the lens holding frame 4.

FIG. 3 is an enlarged view of an essential part of a portion where the waterproof sheet 7 is fixed to the fixed barrel 2 and the lens holding frame 4 so as to maintain waterproofness.

Both ends of the waterproof sheet 7 are closely fixed to each other by welding or bonding so that the frames 11 and 12 made of resin or rubber can be detachably held by the fixed barrel 2 and the lens barrel 4.

Therefore, the frames 11 and 12 are fitted into the fixed barrel 2 and the lens holding frame 4, respectively, and the press ring 13,
It is configured so that waterproofness can be secured by tightening each with 14.

4 and 5 show an embodiment of the shape of a waterproof sheet unit with a frame. FIG. 5 is a development view of the waterproof sheet unit. If the waterproof sheet 17 is made of a thin and breathable material (for example, Gore-Tex under the trade name), the self-holding property of the shape is weak. Therefore, the flexible film 25 such as a polyester film may be attached to the waterproof sheet by bonding or the like. It is stuck in place. Therefore, when the waterproof sheet unit is assembled in the lens barrel, the U-shaped bent portion is smoothly moved as the barrel moves forward and backward, and the waterproof sheet is not loosened or caught on the way.

Further, in order to absorb the difference between the inner diameter of the fixed barrel 2 and the outer diameter of the lens holding frame 4, it is preferable that the waterproof sheet 7 has a tapered shape as the lens holding frame 4 moves in the optical axis direction. This is advantageous because it reduces the resistance. Further, the waterproof sheet is a material having air permeability (for example, a product name GORE-TEX, etc.), and it is possible to eliminate the pressure change due to the change in the inner volume of the lens barrel due to the advance / retreat of the lens holding frame. Prevents an increase in axial movement resistance.

[0015]

As described above, according to the present invention, when the lens holding frame is moved, since only the bent portion of the waterproof sheet is moved, there is no sliding resistance for maintaining airtightness.
The lens drive load is light. Also, since it does not slide, it is highly waterproof. Since the waterproof sheet is attached to the lens barrel, since the frame portions are provided at both ends of the waterproof sheet, the waterproof sheet is detachable, easy to assemble and maintain, and highly reliable in waterproofness.

Further, since the waterproof sheet has air permeability and can reduce the change in the internal pressure of the lens barrel, the pressure valve, the hole, etc., which have been conventionally required, are unnecessary.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a state in which a lens barrel is pulled out in a camera showing an embodiment of the present invention.

FIG. 2 is a side sectional view showing a state where the lens barrel of FIG. 1 is stored.

FIG. 3 is an enlarged view of a main part of FIG.

FIG. 4 is a cross-sectional view of a waterproof sheet that is an embodiment of the present invention.

FIG. 5 is a development view of a waterproof sheet that is an embodiment of the present invention.

FIG. 6 is a side sectional view showing a state in which a lens barrel of a conventional camera is pulled out.

7 is a side sectional view showing a state in which the lens barrel is housed in the state of FIG.

[Explanation of symbols]

 1 Camera body 2 Fixed tube 3 O-ring 4 Lens holding frame 7 Waterproof sheet 11, 12 frame

Claims (3)

[Claims] 1. A mounting structure of a lens barrel having a lens holding frame that advances and retracts in the optical axis direction with respect to a fixed barrel fixed to a camera body, wherein the fixed barrel and the lens holding frame are:
The waterproof sheet is connected through a flexible cylindrical waterproof sheet having watertightness and breathability, and the waterproof sheet has a folded portion that moves back and forth with respect to the lens holding frame moving in the optical axis direction. A lens barrel mounting structure characterized in that the lens barrel is mounted on the lens barrel. 2. The lens barrel mounting structure according to claim 1, wherein the waterproof sheet has frames at both ends,
The lens barrel mounting structure is characterized in that the frames are detachably held by the fixed barrel and the lens holding frame, respectively. 3. The lens barrel mounting structure according to claim 1, wherein the waterproof sheet is formed in a tapered shape, and a bent portion of the waterproof sheet is smooth with respect to advance / retreat of the lens holding frame. A lens barrel mounting structure characterized by being able to move forward and backward.