JP2000249888A - Optical instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent rainwater from flowing into inside in the case of operating an optical device such as a polarizing filter rotatably provided at the inside of optical instrument from outside. SOLUTION: A filter frame 13 holding a polarizing filter 14 is rotatably fitted to a fitting part 11b of a filter holder main body 11 attached to a lens barrel, and a recessed part 11a having a partition is provided at an outer peripheral part of the main body 11, and an operation dial 12 is pivotally supported by a hole (11c) at the inside of the recessed part 11a, and a connecting gear 18 gear-coupled with the operation dial 12 is fitted in a hole 11d at inside, and a second gear 18c of the connecting gear 18 is engaged with a gear part 13a provided at the outer periphery of the filter frame 13, and also a hole 11f penetrating to the outer periphery side of the main body 11 is provided on an optical axis side from the hole 11d at the recessed part 11a, so that the rainwater standing in the recessed part 11a is drawn out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an optical device such as an interchangeable lens barrel, and more particularly to a filter operating device as an optical element used therein.

[0002]

2. Description of the Related Art Conventionally, as a filter operating device used for an optical apparatus of an interchangeable lens barrel, a polarizing filter is mounted on a plug-in type filter which is used by being inserted into a partially cutout portion of the interchangeable lens barrel. In some cases, the filter itself can be rotated by rotating an external operation dial. One example is shown in FIGS. That is, the filter holder main body 1 has a cutout hole 1a into which the operation dial 2 is inserted and an operation dial shaft
A screw hole 1b into which the screw portion 7b is screwed and a fitting portion 1c into which the filter frame 3 is rotatably fitted.
The operation dial 2 is rotatably operated by a user's hand from the outside, and has a gear portion 2a meshing with a gear portion 3a on an outer peripheral portion of the filter frame 3, and a shaft portion having a screw portion 7b at a tip of the operation dial shaft 7. There is provided a hole 2b into which 7a is fitted and inserted. A polarizing filter 4 is fixed to the filter frame 3 by a holding ring 5, and a polarizing filter unit A
After the polarizing filter unit A is rotatably fitted to the filter holder main body 1, the C-type washer 6 is used to hold only the thrust.
The filter holder body 1 is inserted into the hole 8a of the fixing portion 8 of the lens barrel and is mounted. In the filter operation device having the above configuration, the filter frame 3 is rotated by rotating the operation dial 2 from the outside of the lens barrel, and the rotation of the polarization filter 4 can be adjusted.

[0003]

By the way, in the structure of the above-mentioned conventional example, the operation dial 2 is attached to the filter holder main body 1.
There is a problem that water enters through the notch hole 1a when it rains because the notch hole 1a into which is inserted is provided.

The present invention has been made in view of the above-mentioned problems of the prior art, and provides an optical apparatus having a filter operating device capable of providing drip-proofness even when the polarization filter can be rotationally adjusted by an external operation. Aim.

[0005]

In order to achieve the above-mentioned object, according to the present invention, a rotatable optical element is provided inside an optical apparatus, and an outer peripheral portion is provided with a partition having a partition wall to block the inside. A rotation transmitting member for rotating the optical element is supported by a shaft.

[0006]

According to the present invention, there is provided an optical apparatus which is detachable from an optical apparatus and in which a filter unit provided inside the optical apparatus can be rotated by an external operation. Providing a partition that blocks the outside and the inside of the optical device, disposing a rotation transmitting member for transmitting a rotational force by an external operation on the outer periphery of the partition, disposing the filter on the inner periphery of the partition, The rotation transmitting member and the filter unit are connected to each other by a gear train provided with at least one gear having a shaft passing through the partition so that the rotation can be transmitted from the rotation transmitting member even when it rains. Water easily flows into the inner peripheral side of the main body, but disappears. In the present invention as set forth in claim 2, the partition has a concave portion,
The rotation transmitting member is disposed in the concave portion, and a hole that penetrates from the inside of the concave portion to the outer peripheral portion of the device main body is provided on the optical axis side of the rotation center of the rotation transmitting member, so that rain falls. In this case, since the water can be drained without accumulating water in the concave portion by the hole of the concave portion, it is possible to prevent the inflow of water from the shaft portion of the rotation transmitting member due to the capillary phenomenon.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is an exploded perspective view of a main part of a filter operating device according to the present embodiment, FIG. 2 is a plan view thereof, and FIG. 3 is a sectional view taken along line XX of FIG. It is a line sectional view. In the figure,
Reference numeral 11 denotes an annular filter holder main body, which is provided at its outer periphery with a concave portion 11a into which an operation dial 12 described later is inserted, and a fitting portion into which a filter frame 13 described later is rotatably fitted. 11b is provided. A hole 11c for press-fitting an operation dial shaft 17 described later, a hole 11d for fitting a shaft portion 18b of a connection gear 18 described later, and a screw 20 described later are screwed into the concave portion 11a side of the filter holder body 11. Screw hole 11e and hole 1
Holes 11f penetrating from the concave portion 11a to the outer peripheral side of the filter holder main body 11 are provided on the optical axis side of 1c and 11d, respectively.

Reference numeral 12 denotes an operation dial which is rotated by a human hand from the outside. A gear portion 12a meshing with the first gear portion 18a of the connecting gear 18 and a shaft hole 12b into which the operation dial shaft 17 is fitted and inserted, respectively. Is provided. A filter frame 13 has a second gear portion 1 of the connecting gear 18 on its outer periphery.
A gear portion 13a is provided for meshing with the gear 8c and transmitting the rotation from the operation dial 12. Reference numeral 14 denotes a polarizing filter which is an optical element, and is fixed to the filter frame 13 by a holding ring 15. Reference numeral 16 denotes a C-type washer, which is a filter frame 1 to which the polarizing filter 14 is fixed.
After the polarizing filter unit A constituted by 3 is rotatably fitted to the filter holder main body 11, only thrust control is performed.

Reference numeral 17 denotes an operation dial shaft, which is inserted into a hole 11c provided in the filter holder main body 11 and a fitting hole 12b provided in the operation dial 12, and rotatably supports the operation dial 12. I have. Reference numeral 18 denotes a connecting gear, which is a gear portion 12a provided on the operation dial 12.
The first gear b portion 18a meshing with the filter frame 13
A second gear portion 18c that meshes with the gear portion 13a is provided. The connecting gear 18 is rotatably fitted into a first shaft portion 18b rotatably fitted into a fitting hole 11d provided in the filter holder main body 11 and a hole 19a provided in a holding plate 19 described later. Second shaft portion 18 for fitting
d is provided. Reference numeral 19 denotes a holding plate,
A hole 19a into which the second shaft portion 18d is fitted and a hole 19b into which the screw 20 is inserted are provided, and are fixed to the filter holder main body 11 by the screw 20.
Thrust regulations. Reference numeral 21 denotes a fixing portion of the lens barrel to which the filter holder main body 11 is attached, and has a hole 21a into which the filter holder main body 11 is inserted.

In this embodiment having the above structure, the operation dial 12 is rotated from the outside of the lens barrel to rotate the gear portion 12a provided on the operation dial 12 and the first gear portion provided on the connecting gear 18. 18a, a second gear portion 18c, and a gear portion 13a provided on the filter frame 13.
The filter frame 13 is rotated via the
4 can be adjusted. And the operation dial 12
Even if rainwater flows into the recess 11a from between the filter frame and the inner wall of the recess 11a of the filter holder main body 11, the rainwater does not easily enter the filter frame 13 side. Also, the recess 11
Since a hole 11f penetrating through the outer periphery of the filter holder body 11 is provided in the hole a, the water remaining in the concave portion 11a can be quickly drained.

[0011]

As described above, the present invention according to claim 1 is detachable from an optical device, and a filter unit provided inside the optical device can be rotated by an operation from the outside of the optical device. In the optical device, a partition wall that blocks the outside and the inside of the optical device is provided, a rotation transmitting member that transmits a rotational force by an external operation is arranged on an outer peripheral portion of the partition wall, and the filter is provided on an inner peripheral portion of the partition wall. The rotation transmitting member and the filter unit are rotated by a gear train having at least one shaft passing through the partition wall so that the rotation can be transmitted even when it rains. Water can be prevented from easily flowing into the inner peripheral side of the device main body from the transmission member. According to a second aspect of the present invention, the partition has a concave portion, the rotation transmitting member is disposed in the concave portion, and the outer periphery of the device main body is positioned from the concave portion closer to the optical axis than the rotation center of the rotation transmitting member. By providing a through hole in the portion, when rain falls, water can be drained without accumulating water in the concave portion by the hole of the concave portion, so that the capillary tube from the shaft portion of the rotation transmitting member The inflow of water due to the phenomenon can be prevented.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a filter operating device for an optical device according to an embodiment of the present invention.

FIG. 2 is a plan view thereof.

FIG. 3 is a sectional view taken along line XX of FIG. 2 in a state of being mounted on a lens barrel as an optical device.

FIG. 4 is an exploded perspective view of a conventional filter operating device for an optical device.

FIG. 5 is a plan view thereof.

FIG. 6 is a sectional view taken along line XX of FIG. 5 in a state of being mounted on a lens barrel as an optical device.

[Explanation of symbols]

11. filter holder body, 11a recess, 1
1f hole, 12 operation dial, 13 filter frame, 14 polarization filter, 15 holding ring, 16
..C-type washers, 17 operation dial shafts, 18.
・ Connection gear, 19 ・ ・ Holding plate, 20 ・ ・ Screws, 21 ・ ・
Fixed part of lens barrel, A .. filter unit.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Tatsuya Sato, Inventor 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Inventor Takashi Watanabe 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon F term in reference (reference) 2H044 AE10 DA03 DB01 DD08 DD15 2H083 AA07 AA34

Claims (2)

[Claims] 1. An optical device which is detachable from an optical device and in which a filter unit provided inside the optical device can be rotated by an operation from the outside of the optical device, the outside and the inside of the optical device are shut off. A partition is provided, a rotation transmitting member for transmitting a rotational force by an external operation is disposed on an outer peripheral portion of the partition, and the filter is disposed on an inner peripheral portion of the partition, and the rotation transmitting member and the filter unit are An optical device, wherein a gear having a shaft penetrating a partition wall is coupled to be rotatable by a gear train provided at least. 2. The partition has a concave portion, in which the rotation transmitting member is disposed, and penetrates from the inside of the concave portion to the outer peripheral portion of the device main body on the optical axis side of the rotation center of the rotation transmitting member. The optical device according to claim 1, wherein a hole is formed.