JP2016053687A5 - Built-in member for light amount adjusting device, light amount adjusting device, and optical apparatus - Google Patents

Description

The invention, embedded member incorporated as at least a part of the configuration of a light amount adjustment device mounted in the imaging apparatus such as a camera, and the light quantity adjusting device including the embedded member, and provided with the light quantity adjusting device It relates to optical equipment.

Conventionally, for example, in the light amount adjustment device, such as the diaphragm device, configuration formed by a number of sheets of aperture blades of the diaphragm aperture shape as the light passage opening (light amount adjustment blade) is known (see Patent Document 1 ). Japanese Patent Application Laid-Open No. H10-260260 discloses a configuration in which a large number of diaphragm blades are rotated by a drive ring that is rotatable around a fixed opening formed in a pedestal.

The present invention provides an optical apparatus having built-members and the light amount adjuster and the same for the light amount adjustment device having an improved sliding performance.

Further, in the present invention, wherein the surface of at least said ceramic fiber reinforced layer of the embedded member ceramic fiber reinforced layer is provided, wherein a protective film is provided. According to such an aspect of the present invention, the fiber orientation of the ceramic fiber reinforced layer is oriented in the plane direction, and the rate at which the end portion of the ceramic fiber projects on the surface is reduced. It is possible to reduce the thickness of the protective film for improving the slidability.

According to the present invention, it is possible to provide an optical apparatus having built-members and the light amount adjuster and the same for the light amount adjustment device having an improved sliding performance.

For example, even if the resin portion of the ceramic fiber reinforced layer 100 is scraped on the surface side of the drive ring 1 due to friction generated between the drive ring 1 and the holding member 2 as the drive ring 1 is rotated, the remaining ceramic fibers are not Since it is oriented in the surface direction, the holding member 2 and the outer peripheral surface along the longitudinal direction of the ceramic fiber are substantially in sliding contact. That is, the outer peripheral surface of each ceramic fiber that appears on the surface of the ceramic fiber reinforced layer 100 becomes a sliding contact surface, and the high sliding performance of the drive ring 1 between the drive ring 1 and the holding member 2 is maintained over a long period of time. Can be maintained. Further, when a protective film is formed on the surface of the ceramic fiber reinforced layer 100 by painting, the surface of the protective film becomes a sliding contact surface at the beginning of use, and after the protective film is scraped, the surface of the ceramic fiber reinforced layer ( (Resin surface) becomes the sliding contact surface, and then the surface on which the outer peripheral surface of the ceramic fiber appears becomes the sliding contact surface after the resin surface is scraped. In addition, when not providing a protective film, the surface of the ceramic fiber reinforcement layer 100 turns into a slidable contact surface.

<Comparative Example 5>
As a driving ring of Comparative Example 5, a driving ring (without coating) was prepared using a material obtained by adding 20% by weight of glass fiber to polycarbonate resin, and 20% by weight of glass fiber was added to polycarbonate resin. The obtained material was used as a holding member and incorporated in the light amount adjusting device described above, and a diaphragm operation durability test was performed. As a result, as shown in Table 1, both the drive ring and the holding member were worn out and the material was scraped by 50,000 operations .

Specifically, in the present embodiment, the surface of the annular protrusion 11 of the drive ring 10 is constituted by the ceramic fiber reinforced layer 100. On the other hand, the holding member 20 is provided with seven convex portions 20c at substantially equal intervals on the inner peripheral surface 20b of the opening 20a. Each convex portion 20c is provided so as to protrude from the inner peripheral surface 20b of the opening 20a toward the light passing path side, and the surface thereof is an R surface. In the present embodiment, when the drive ring 10 is rotated, the annular protrusion 11 of the drive ring 10 comes into sliding contact with the convex portion 20 c of the holding member 20. At this time, in this embodiment, since the part which comprises the surface of the side which contacts the convex part 20c in this annular projection part is comprised by the ceramic fiber reinforcement layer 100, similarly to Embodiment 1 mentioned above, High sliding performance can be obtained.

Specifically, in the present embodiment, the surface of the annular protrusion 11 of the drive ring 10 is constituted by the ceramic fiber reinforced layer 100. In this embodiment, the annular protrusion 11 of the drive ring 10 and the inner peripheral surface 2b of the holding member 2 are in sliding contact with each other. Even in this case, in the present embodiment, the portion constituting the surface of the annular projecting portion 11 that is in sliding contact with the inner peripheral surface 2b of the holding member 2 is configured by the ceramic fiber reinforced layer 100, and thus described above. As in the first or second embodiment, high sliding performance can be obtained.

(Other embodiments)
As mentioned above, although this invention was demonstrated in detail based on each Embodiment 1-3, this invention is not limited to each Embodiment 1-3 mentioned above. For example, in the first embodiment described above, the case where the ceramic fiber reinforced layer 100 is applied on the drive ring 1 side has been described. However, the present invention is of course not limited thereto, and for example, contacts the drive ring 1 of the holding member 2. At least the ceramic fiber reinforced layer 100 may be applied to the portion to be applied, and this may also be applied to the second and third embodiments.

Moreover, in Embodiment 1 mentioned above, although the case where the ceramic fiber reinforcement layer 100 was applied with respect to one drive ring 1 among the drive ring 1 and the holding member 2, of course, this invention is not limited to this, For example, you may apply the ceramic fiber reinforcement layer 100 to each of the part which mutually contacts in both the drive ring 1 and the holding member 2. FIG.

In addition, the ceramic fiber reinforced layer 100 described above may be provided as appropriate only in the portion in sliding contact between the built-in members of the light amount adjusting device, or the entire built-in member may be formed of a ceramic fiber reinforced composite material.

Claims (2)

The core portion other than the ceramic fiber reinforced layer of the built-in member has a matrix structure integrally formed with the ceramic fiber reinforced composite material, and the ceramic fibers substantially intersect, and the ceramic fiber reinforced layer the fiber orientation of the ceramic fibers in the built member for the light amount adjustment device according to any one of claims 1 to 4, wherein the relatively higher than the core portion. 7. The protective film is provided on at least a surface of the built-in member provided with the ceramic fiber reinforced layer, the surface being made of the ceramic fiber reinforced layer. 8. A built-in member for the light amount adjusting device described in 1.