JPH0440190Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a support structure for an externally operated rotary member of a camera, which improves dustproof and waterproof properties.

Conventionally, this type of device has reduced the gap between the external operating member and the exterior member, but has been vulnerable to small dust and water. O between the above two members
It has been considered to insert a ring, but the position of the operating member is determined by the internal mechanism of the camera, and the center of the operating member is not aligned with the external member, making the gap where the O-ring is inserted uneven, resulting in dirt and water getting in. or operation becomes difficult. In order to compensate for these shortcomings,
There is a support structure like No. 164138, but when it rotates due to eccentricity, the rubber ring wrinkles and gaps are created. On the other hand, even if the center is centered (there is no eccentricity), in order to prevent dirt and water from entering, it is necessary to use elasticity to fit the rubber into the presser, and the intermediate ring and external member rotate. Therefore, a certain amount of clearance is required, and although it is possible to prevent dirt from entering, it is difficult to prevent water from entering.

In addition, there is a support structure such as the one disclosed in Japanese Utility Model Application No. 57-88121, but the external member and the rotation operation member may not be perpendicular to each other, and the gap between the two members is not completely closed, and the rotation is difficult. This may cause water to enter.

In FIG. 1 showing one of the conventional examples, 1 is an upper cover of the camera, and a support part 2 formed on the camera body protrudes from an opening formed in the upper cover 1 to the outside of the camera. The ta-dial 3 is rotatably supported through its central opening. The shutter dial 3 has a disk portion 3b that is perpendicular to the shaft portion 3a, and a cylindrical portion 3c that extends in a cylindrical shape from the outer circumference of the disk portion 3b toward the upper cover. In order to prevent dust and water from entering the camera through the gap formed between the cylindrical part 3c and the upper cover 1, the inner circumferential side of the tip of the cylindrical part 3c is cut out, and the upper cover is attached to that part. A ring 4 fixedly attached to 1 is entering. However, even with this structure, it is difficult to center the shutter dial 2 and ring 4, so it is necessary to leave a gap between them. Infiltration is unavoidable.

The present invention eliminates the drawbacks of the above-mentioned conventional technology and provides a support structure for an externally operated rotary member of a camera that is sufficiently dustproof and waterproof even if there is eccentricity between the exterior member of the camera and the rotary operation member. It was done for the purpose of

In order to achieve the above object, in the present invention, a stepped surface 12b extending in a plane perpendicular to the axis is provided in the axially intermediate portion of the cylindrical support portion 12 that is integral with the camera body, and the stepped surface 12b is provided as an external member of the camera. The cylindrical part 1 has an inner circumferential surface that forms an annular gap e between it and the outer circumferential surface of the cylindrical support part.
4 was formed, and an end surface 14a was formed at the end of this cylindrical portion, extending in a plane perpendicular to the axis thereof and whose axial position substantially coincides with the stepped surface 12b. A sealing ring 15 is placed on the end surface 14a and the stepped surface 12b so as to span both sides, and an intermediate member 1 that applies pressure in the axial direction to the sealing ring
6 and 17, and the sealing ring is connected to the stepped surface 12b.
and the end surface 14a.

With this configuration, even if there is eccentricity between the cylindrical part 14 formed on the external member 11 and the cylindrical support part 12, the sealing ring 15 can be kept on the same plane by the action of the intermediate members 16 and 17. Since it maintains a state in which it is pressed against two surfaces facing in the same direction, that is, a state in which it is in pressure contact with the stepped surface 12b of the cylindrical support part 12 and the end surface 14a of the cylindrical part 14, dust, water, etc. etc. can be reliably prevented from entering through the gap between the cylindrical support part 12 and the cylindrical part 14.

Next, an embodiment of the present invention will be described based on FIG. 2.

In this embodiment as well, a dial support part 12 integral with the camera body projects in a cylindrical shape at a distance from an opening of an upper cover 11 constituting an external member of the camera. A shutter dial 13 is rotatably supported by its shaft portion 13a. An O-ring 18 is provided on the shaft portion 13a. A cylindrical portion 13c is formed from the outer peripheral side of the disc portion 13b at the tip of the shutter dial 13 toward the upper cover 11. Cylindrical part 1
The distal end portion 3c is spaced apart from the upper cover 11 by an appropriate distance.

A cover ring 14 is provided on the outer periphery of the base cylindrical portion 12a of the dial support portion 12 at a position away from the tip of the cylindrical portion 13c of the shutter dial 13 toward the upper cover side.
Stepped surface 12 located in a plane orthogonal to the axis of
b is formed, and the shutter dial 13 forms a tip cylindrical portion 12c having a smaller diameter than the root cylindrical portion 12a from the stepped surface 12b to the tip. At the opening of the upper cover 11, a cylindrical cover ring 14 surrounding the cylindrical part 12a of the dial support part 12 with an annular gap e extends to the stepped surface 12b of the cylindrical part 12a, and the upper end surface 14a is located in a plane perpendicular to the axis of the cover ring 14.

Stepped surface 12b and upper end surface 14a of cover ring 14
are substantially flush with each other, and an elastic or viscoelastic sealing ring 15 is provided on both sides thereof.
is placed, the intermediate ring 16 and the E ring 17
is being pressed by. The inner diameter surface of the sealing ring 15 is selected to be somewhat larger than the outer diameter surface of the cylindrical portion 12c facing it, so as to form an annular gap between the inner and outer diameter surfaces.

Further, the intermediate ring 16 includes a large diameter portion 16a having an inner diameter that tightly fits the outer diameter of the cover ring 14;
A gap is formed between the flat portion 16b substantially parallel to the stepped surface 12b of the support portion 12 and the outer diameter surface of the cylindrical portion at the tip, which is larger than the outer diameter of the cylindrical portion 12c at the tip. The small diameter cylindrical portion 16c has a rounded inner diameter surface. Therefore, when assembling, the sealing ring 15 is appropriately placed on the stepped surface 12b of the support part 12 and the upper end surface 14a of the cover ring 14, and the intermediate ring 16 is fitted to compress the sealing ring 15. Fix with E-ring 17. In this way, the E-ring 17 is attached to the cylindrical portion 12 of the support portion 12
The intermediate ring 16 is pressed against the sealing ring 15 so that the sealing ring 15 is in compressed contact with the stepped surface 12b and the upper end surface 14a of the cover ring 14.

As described above, this embodiment has a structure in which there is a gap e that positively allows eccentricity between the shutter dial support part 12 and the upper cover 11, so that the distance between the shutter dial support part and the upper cover is There is no need for high manufacturing precision for centering etc.
Moreover, the cylindrical portion 12a of the shutter dial support portion
The gap formed between the cover ring 14 on the upper cover side and the cover ring 14 on the upper cover side is completely blocked by the sealing ring 15, and the intrusion of dirt and water into the inside of the upper cover through the gap is effectively prevented.

In addition, in order to improve workability, if a water-repellent foam is used as the sealing ring, the force with which the intermediate ring is pressed may be weak when pushing the E-ring into the support ring. In particular, when a water-repellent paint is impregnated into an elastic or viscoelastic foam, the paint is retained in the foamed parts and the waterproof performance is improved.

As described above, according to the present invention, a stepped surface extending in a plane perpendicular to the axis is provided in the axially intermediate part of the cylindrical support part that is integrated with the camera body, and the cylindrical support part is provided on the camera exterior member. A cylindrical part having an inner circumferential surface forming an annular gap between the outer circumferential surface of the cylindrical part and a stepped surface extending in a plane orthogonal to the axis of the cylindrical part and in the axial direction. End faces were formed whose positions substantially coincided, and a sealing member was interposed between the stepped face and the end face.

Therefore, even if the camera body, that is, the cylindrical support part, and the camera exterior member may be eccentric to each other due to the gap that exists between the two members, the contact between the cylindrical support part, the camera exterior member, and the sealing member is maintained. does not change and the sealing member is always in contact with the stepped surface and the end surface, so that the ingress of dust, dust and water through the gap is well prevented. That is, between the outer appearance members of the camera such as the upper cover and the rotating members such as the shutter dial that protrude from the upper cover, manufacturing is extremely easy because a gap is actively allowed between the outer appearance members of the rotating member and the outer appearance members. Since the formed annular space is blocked, better dustproof and waterproof effects can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional example, and FIG. 2 is a sectional view showing an embodiment of the present invention. Explanation of symbols of main parts, 11...External appearance members, 1
2... Cylindrical support part, 12b... Stepped surface, 13...
... Rotating member, 14 ... Cylindrical part, 14a ... End surface,
15... Sealing ring, 16, 17... Intermediate member.

Claims (1)

[Claims for Utility Model Registration] An exterior member having an opening, a cylindrical support part that is integrally formed with the camera body and projects outward from the opening, and a cylindrical support part that is pivotally supported and can be externally operated. An externally operated rotating member support structure for a camera including a rotating member, wherein a stepped surface extending in a plane perpendicular to the axis is provided in the axial middle of the cylindrical support part, and the peripheral edge of the opening of the external member A cylindrical part having an inner circumferential surface that forms an annular gap with the outer circumferential surface of the cylindrical support part is formed, and an end of the cylindrical part is formed in a plane orthogonal to the axis thereof. forming an end surface that is wide and substantially coincident with the stepped surface in an axial direction, and has an elastic sealing ring placed so as to straddle the stepped surface and the end surface, the sealing ring and the cylindrical support part, the intermediate member applies pressure to the sealing ring in the axial direction of the cylindrical support part to press the sealing ring into contact with both the stepped surface and the end surface. What is claimed is: 1. A support structure for an externally operated rotating member of a camera, characterized in that: