JP2016090983A - Imaging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an imaging apparatus that can maintain light shielding and dust-proof performance without depending upon a sticking error during assembly when a lens barrel is provided with a light shield member, and hardly causes the lens barrel to generate noise or deteriorate.SOLUTION: An imaging apparatus has a first cylinder, a second cylinder which is inside the first cylinder and moves relatively in an optical axis direction, an annular light shield member, and an exterior member which performs position restriction of an optical axis method of the light shield member. The light shield member has an elastic body which comes into elastic contact with an outer shape of the second cylinder on an inner-diameter side thereof and a slide part which covers parts of top and reverse surfaces of the elastic body and slides on the first cylinder and exterior members, and the slide part is formed of a member having less frictional resistance than the elastic body.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an imaging apparatus, and more particularly to a lens barrel.

  Conventionally, a number of zoom lens barrels have been proposed that extend from the image pickup apparatus body during shooting and retract into the body when stored. The lens barrel having such a mechanism is configured to move a plurality of lenses back and forth in the optical axis direction by combining a plurality of rectilinear tubes and a rotating tube. Further, by storing those cylinders when not in use, the thickness of the imaging device main body is reduced. In such a retractable lens barrel, a light-shielding member is provided to prevent harmful light and dust from entering from the gap between the tubes constituting the lens barrel or the gap between the lens barrel and the camera body. .

  As a configuration of the light shielding member, an annular light shielding member is attached to a tube fixed to the lens barrel with a double-sided tape or the like, or light shielding is performed between an annular cap member provided at the tip of the lens barrel member and the tube member. The thing etc. which were hold | maintained on both sides of the member have been proposed. The prior art provided with the latter mechanism is disclosed in Patent Document 1.

JP 2012-118343 A

  In the above-described method of attaching an annular light shielding member to a fixed cylinder with a double-sided tape or the like, there is a possibility that the light shielding member is displaced due to a sticking error during assembly and does not perform light shielding and dustproof performance. Further, in the lens driving device as disclosed in Patent Document 1, the light shielding member that rotates together with the rotating cylinder is configured to rub against the non-rotating rectilinear cylinder on the inner diameter side thereof, so that abnormal noise due to friction, deterioration of the light shielding member, etc. There was a risk of problems.

  Accordingly, an object of the present invention is to provide an imaging device that can maintain a light-shielding and dust-proof performance without depending on a sticking error at the time of assembly when the light-shielding member is provided on the lens barrel, and is less likely to cause abnormal noise or deterioration in the lens barrel. It is to provide.

  In order to achieve the above object, the present invention provides a first cylinder, a second cylinder inside the first cylinder and relatively moving in the optical axis direction, an annular light shielding member, and light from the light shielding member. In the imaging apparatus having the exterior member that regulates the position of the shaft method, the light shielding member includes an elastic body that elastically contacts the outer shape of the second cylinder on an inner diameter side thereof, and covers a part of the front and back surfaces of the elastic body. It has a sliding part that slides with one cylinder and the exterior member, and the sliding part is formed of a member having a smaller frictional resistance than the elastic body.

  According to the present invention, in providing a light shielding member in a lens barrel, there is provided an imaging device that can maintain a light shielding and dustproof performance without depending on a sticking error at the time of assembling, and hardly cause abnormal noise or deterioration in the lens barrel. be able to.

1 is a cross-sectional view of a lens barrel at the time of photographing by an imaging apparatus to which an embodiment of the present invention is applied. 1 is a perspective view of an imaging apparatus to which an embodiment of the present invention is applied. 1 is an exploded perspective view of a lens barrel of an imaging apparatus to which an embodiment of the present invention is applied. 1 is a cross-sectional view of a lens barrel at the time of photographing by an imaging apparatus to which an embodiment of the present invention is applied. 1 is a cross-sectional view of a lens barrel at the time of photographing by an imaging apparatus to which an embodiment of the present invention is applied. 1 is a cross-sectional view of a lens barrel at the time of photographing by an imaging apparatus to which an embodiment of the present invention is applied. 1 is a front view of a lens barrel at the time of shooting by an imaging apparatus to which an embodiment of the present invention is applied.

  Hereinafter, an imaging apparatus according to an embodiment of the present invention will be described with reference to FIGS.

[Example]
FIG. 1 is a cross-sectional view of a lens barrel at the time of photographing of an imaging apparatus to which an embodiment of the present invention is applied, and the lens barrel is in a photographing state. FIG. 2 is a perspective view of an imaging apparatus to which this embodiment is applied. As shown in FIG. 1, the lens barrel configuration of the present embodiment is a configuration in which a rectilinear barrel and a rotary barrel are combined, and the total length of the barrel can be changed between photographing and retracting. The lens barrel 10 constitutes a collapsible barrel by a combination of the rotating barrels 32 and 42 and the rectilinear barrels 31, 41 and 43, and the first group barrel 51.

  In the drawing, detailed cam grooves and the like are omitted. A light shielding sheet 33 formed in an annular shape is provided at the distal end portion of the fixed cylinder 21 to close a gap formed between the outer diameter of the rotating cylinder 32 and the inner diameter of the fixed cylinder 21. An imaging element 14 and a sensor holder 22 are provided at the rear end of the lens barrel 10. Reference numeral 53 denotes a first group cover having an opening shape. Then, the lens barrel 10 is covered with the camera exterior cover 1 and is in a camera body state as shown in FIG. FIG. 3 is a detailed perspective view of the fixed cylinder 21 and the light shielding sheet 33. FIG. 4 is a diagram showing in detail the configuration of the light shielding sheet 33 provided at the tip of the lens barrel 10 and its surroundings, and FIGS. 5A and 5B show the configuration of the light shielding sheet 33. FIG.

  The light shielding sheet 33 in the present embodiment has a three-layer structure as shown in FIG. An elastic body 33b is provided at the center of the three layers, and a sliding portion 33a is provided so as to sandwich the elastic body 33b. The elastic body 33b is made of an elastically deformable material, and is made of a soft material such as a foam. The sliding portion 33a is made of a material having a relatively small surface roughness, and is made of a material such as a PET sheet material, for example.

  The elastic body 33 b of the light shielding sheet 33 is press-fitted into the inner rotating cylinder 32 to be elastically deformed in the radial direction so as to be in close contact with the rotating cylinder 32, and a gap between the rotating cylinder 32 and the fixed cylinder 21 is formed. Block it. Further, when the light shielding sheet 33 rotates together with the rotating cylinder, the sliding portion 33 a and the sliding surface 21 c of the fixed cylinder 21 or the sliding surface 1 a of the camera exterior cover 1 slide. The elastic body 33b is an elastic deformation member and has a large sliding resistance. In this embodiment, the sliding portion 33a is configured to cover the end surface of the elastic body 33b so as not to slide a member having a large sliding resistance, and slides on the surface of the sliding portion 33a having a small sliding resistance. Therefore, both the light shielding sheet 33 and the rotating cylinder can follow the rotation smoothly.

  As shown in FIG. 5B, a regulating rib 21 a formed at the tip of the fixed cylinder 21 is provided outside the light shielding sheet 33 so as to surround the outer periphery of the light shielding sheet 33. The height of the regulation rib 21 a is set to be larger than the total thickness of the light shielding sheet 33. This prevents the light shielding sheet 33 from being pushed by the camera exterior cover 1 to eliminate a gap in the optical axis direction of the light shielding sheet 33 and prevent the rotation cylinder 32 from following the rotation.

  FIG. 6 is a view of the lens barrel 10 as seen from the front. Although the regulation rib 21a of the fixed cylinder 21 is provided so as to surround the outer periphery of the light shielding sheet 33, a protruding portion 21b is provided in which a part thereof protrudes radially outward. This is because the dust that has entered from the gap between the camera outer cover 1 and the rotary cylinder 32 accumulates at the tip of the fixed cylinder 21, and the collected dust does not interfere with the rotation of the light shielding sheet 33. It has become. By installing the protruding portion 21b, even if dust enters, dust does not enter the lens barrel 10, and the light shielding and dustproof performance of the light shielding sheet 33 does not deteriorate.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

1 camera exterior cover, 10 lens barrel, 11 lens, 14 image sensor,
21 fixed cylinder, 22 sensor holder, 31 rotating cylinder, 32 rectilinear cylinder,
33 light shielding sheet, 41 cover cylinder, 42 rotating cylinder, 43 rectilinear cylinder, 51 first group cylinder,
53 1 group cap

Claims (5)

A first cylinder (21), a second cylinder (32) located inside the first cylinder and relatively moving in the optical axis direction;
An annular light shielding member (33);
An exterior member (1) for regulating the position of the optical axis method of the light shielding member;
In an imaging apparatus having
The light shielding member has an elastic body (33b) that elastically contacts the outer shape of the second cylinder on its inner diameter side, covers a part of the front and back surfaces of the elastic body, and slides on the first cylinder and the exterior member. A sliding portion (33a),
The imaging apparatus according to claim 1, wherein the sliding portion is formed of a member having a smaller frictional resistance than the elastic body. 2. The imaging according to claim 1, wherein the first cylinder is non-rotating, the second cylinder rotates, and the light shielding member rotates together with the rotation of the second cylinder. apparatus. The imaging apparatus according to claim 1, wherein an inner diameter of the light shielding member is smaller than an outer diameter of the second cylinder. The first tube is provided with a regulation rib (21a) that surrounds the outer periphery of the light shielding member in a circular shape, and the protruding amount of the regulation rib is larger than the thickness of the light shielding member. The imaging device according to any one of claims 1 to 3. The imaging device according to claim 4, wherein the restriction rib includes at least one projecting portion (21 b) projecting outward in the circumferential direction.