JP2017191275A - Lens barrel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens barrel capable of: obtaining a satisfactory feeling for sliding by mounting a click receiving barrel, to which a surface treatment is applied, on a fixture barrel; and adjusting an engagement between the fixture barrel and a tripod mounting barrel.SOLUTION: A lens barrel includes: a fixture barrel 10; a click receiving barrel 20 that is applied with a surface treatment different from that of the fixture barrel and has a click receiving part 24; a tripod seat rotary barrel that can rotatably slide on an outer periphery of the lens barrel and that has click means capable of being inserted into and removed from the tripod seat and the click receiving part. The click receiving barrel is fixed to the fixture barrel.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lens barrel having a tripod seat that rotates and slides.

  Conventionally, many telephoto interchangeable lenses are provided with a tripod mount for mounting a tripod separately from the camera body.

  The tripod mount is configured to protrude from the rotatable ring centered on the optical axis on the exterior of the lens barrel, and the ring is provided with a lock mechanism to fix the rotation and fixed at any position And shooting is performed.

  Further, the ring and the lens barrel are provided with a mechanism for making a feeling of clicking, and can be fixed at a predetermined position without checking the index.

  An example of a lens barrel provided with a tripod mount so as to protrude from the ring is Patent Document 1. According to the invention disclosed in Patent Document 1, in a tripod seat in which a tripod mounting ring having a tripod mounting portion is fitted to the outer periphery of the lens barrel so as to be relatively rotatable, the click mechanism and the lock mechanism are simply configured. You can get a tripod seat.

Japanese Utility Model Publication No. 4-130912

  However, in the invention described in Patent Document 1, a suitable sliding feeling cannot be obtained because the fixed cylinder and the tripod mounting ring, which are metallic materials, slide directly without any special treatment. In addition, since the click part that causes a click feeling is worn and scraped every time it is inserted and removed, there is a problem that the click feeling deteriorates as the number of sliding increases. In addition, since there is no adjustment mechanism for engagement between the fixed cylinder and the tripod mounting ring, it is impossible to perform adjustment later when there is an angle variation in the manufacturing process.

  In view of the above problems, the present invention provides a lens barrel capable of obtaining a suitable sliding feeling by attaching a click receiving tube having a surface treatment to a fixed tube, and further adjusting the engagement between the fixed tube and a tripod mounting tube. The purpose is to provide.

  The invention shown in claim 1 is a fixed barrel and a click receiving barrel having a click receiving portion that is subjected to a surface treatment different from that of the fixed barrel, and a tripod seat and the click receiving portion that are slidable on the outer periphery of the lens barrel. The lens barrel is characterized in that it has a tripod-seat rotating cylinder having a click means that can be inserted into and removed from the lens, and the click receiving cylinder is fixed to the fixed cylinder.

  According to a second aspect of the present invention, in the lens barrel according to the first aspect, the surface treatment is an addition treatment of an electroless nickel film.

  The invention shown in claim 3 is characterized in that the click receiving cylinder is fixed to the fixed cylinder by inserting a fastening member into the elongated hole portion. This is a lens barrel.

  The invention shown in claim 4 is characterized in that the click receiving tube is fastened to the fixed tube by inserting the fastening member in the optical axis direction. It is a lens barrel.

  The invention shown in claim 5 is characterized in that the click receiving tube is fastened to the fixed tube by inserting the fastening member in a direction perpendicular to the optical axis. It is a lens barrel of description.

  The invention shown in claim 6 is characterized in that the click means has a spherical member and a biasing means for biasing the spherical member in a direction perpendicular to the optical axis of the lens barrel. A lens barrel according to claim 5.

  The lens barrel according to any one of claims 1 to 6, wherein the click receiving barrel has a chamfered portion on the object side of the lens barrel.

  According to the present invention, it is possible to provide a lens barrel capable of obtaining a suitable sliding feeling by attaching a click receiving tube subjected to surface treatment to a fixed tube, and further adjusting the fixed tube and a tripod mounting tube. it can.

It is a development perspective view of the main component in the lens barrel which showed one example of the present invention. It is sectional drawing of the main structural members in the lens barrel which showed one Example of this invention. It is the top view which looked at the click receptacle from the object side. It is sectional drawing of a click receptacle. It is a perspective view of the click receiving cylinder of a different shape.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. In addition, this invention is not limited by this embodiment.

  FIG. 1 is an exploded perspective view of main components in a lens barrel showing an embodiment of the present invention. FIG. 2 is a cross-sectional view of main components in the lens barrel showing an embodiment of the present invention. Hereinafter, the lens barrel member will be described with reference to FIGS. 1 and 2. Here, the lens barrel can be replaced with an imaging device and has an optical axis at the center thereof. Further, in this specification, the side where the mount portion exists is called the imaging device side, and the opposite side is called the object side.

  Reference numeral 10 denotes a fixed cylinder in the lens barrel, which includes an optical element (not shown) and the like inside.

  The click receiving cylinder 20 is a cylindrical member that has been subjected to a surface treatment. The click receiving cylinder 20 includes four click receiving portions 24 arranged at equal intervals on the outer periphery, and three fastening holes 22 on the inner peripheral portion. I have. Further, the click receiving cylinder 20 is fixed to the fixed cylinder 10 by inserting a fastening member 26 such as a fastening screw into the fastening long hole 22.

  The tripod mounting cylinder 30 is a cylindrical member that can be relatively rotated about the optical axis of the lens barrel. The lock mechanism 32 is a member provided for switching the sliding state of the tripod mounting cylinder, and fixes the tripod mounting cylinder 30 in a non-slidable state by tightening. The click ball 34 is always in point contact with the click receiving cylinder 20 by being urged in a direction perpendicular to the optical axis by the urging spring 36, and is inserted into and removed from the click receiving portion 24 of the click receiving cylinder 20. It forms a click mechanism that creates a click feeling. The tripod mounting cylinder 30 is in contact with the fixed cylinder 10 so as to cover the click receiving cylinder 20 fixed to the fixed cylinder 10 from the imaging device side.

  The rear member 40 is a member having a mount portion 42, is in contact with the tripod mounting cylinder 30, and is fixed to the fixed cylinder 10 by a fastening member (not shown). In FIG. 2, the rear member 40 is depicted with a part thereof omitted.

  FIG. 3 is a plan view of the click receiving cylinder 20 as viewed from the object side. Hereinafter, the effect by providing the click receiving cylinder 20 is demonstrated using FIG.

  Since the click ball 34 of the tripod mounting cylinder 30 slides on the outer periphery of the click receiving cylinder 20, the click receiving cylinder 20 is a member that is the basis of the sliding feeling of the tripod mounting cylinder 30. In the conventional lens barrel, the click ball is slid directly on the fixed cylinder while being urged in the direction perpendicular to the optical axis by the urging spring, and both are made of a metal material such as aluminum, magnesium, and stainless steel. There was a problem with the sliding feeling.

  As a result of diligent research, the applicant discovered that a suitable sliding feeling can be obtained by applying the electroless nickel plating to the portion where the click ball 34 slides. However, the addition of electroless nickel plating makes it difficult to stabilize the film thickness while maintaining hardness, so it is inappropriate to apply to parts that require high dimensional accuracy related to the positional accuracy of the lens, such as a fixed cylinder It is. Moreover, since electroless nickel plating is added by immersing a raw material in a plating solution, it is difficult to surface-treat only a predetermined portion. Therefore, in this application, instead of subjecting the entire fixed cylinder 10 to surface treatment, a new click receiving cylinder 20 is provided, and only the click receiving cylinder 20 is subjected to surface treatment. In addition, since it is a well-known technique about the addition method of electroless nickel plating, detailed description is abbreviate | omitted.

  Thus, by performing the surface treatment by electroless nickel plating, the slidability of the tripod mounting cylinder 30 can be improved. Further, since the surface hardness is improved, the click receiving portion 24 can be prevented from being scraped due to wear caused by insertion and removal of the click ball 34.

  Moreover, by providing the click receiving cylinder 20, the member which performs surface treatment can be reduced in size, and processing difficulty can be reduced. At the same time, since the area for surface treatment is reduced, the cost required for the surface treatment can be reduced. The click receiving tube can be used in the same manner for other types of lens barrels having fixed tubes having the same diameter and different shapes. That is, since it can be a common member for different lens barrels, the manufacturing cost can be reduced.

  As shown in FIG. 3, the click receiving tube 20 includes three fastening holes 22 in the inner peripheral portion. The fastening long hole 22 is provided to restrict the fastening member 26 for fixing the click receiving cylinder 20 to the fixed cylinder 10. By using such a long hole restricting portion, it is possible to adjust the manufacturing variation in the angular direction between the fixed cylinder 10 and the tripod mounting cylinder 30.

  For example, an index is provided on each of the fixed cylinder 10 and the tripod mounting cylinder 30, and if a click ball 34 is inserted into a predetermined click receiving portion 24, the index is adjusted so as to match each other, and is fixed by the fastening member 26. Think about the process. If the click receiving portion 24 is provided directly on the fixed cylinder 10, if the index is shifted due to a manufacturing error, it cannot be corrected after the member is manufactured, and the fixed cylinder 10 or the tripod mounting cylinder 30 is replaced with the same member. There must be.

  However, if the click receiving cylinder 20 provided with the fastening long hole 22 exists, if it is within the regulation range, the fastening member 26 is loosened, the angle direction is finely adjusted, and the adjustment after the member is manufactured by fastening again. Is possible.

  FIG. 4 is a cross-sectional view of the click receiving cylinder 20. The click receiving cylinder 20 has a chamfered portion 28 in such a manner that the edge of the inner peripheral portion is dropped on the object side. With such a structure, the assembly process for fitting the click receiving cylinder 20 to the fixed cylinder 10 from the imaging device side is facilitated.

  In this embodiment, the shape of the click receiving cylinder is as shown in FIGS. 3 and 4, but it may be different. FIG. 5 is a perspective view showing a click receiving cylinder having a different shape.

  The click receiving cylinder 50 is a cylindrical member that has been subjected to a surface treatment. The click receiving cylinder 50 includes four click receiving portions 54 arranged at equal intervals on the outer periphery thereof, and four elongated fastening holes 52 on the outer periphery thereof. ing. Further, the click receiving tube 50 is fixed to the fixed tube by inserting a fastening member into the fastening long hole 52.

  Further, the fastening long hole 52 has a long hole shape and can be adjusted after the parts are manufactured in the same manner as the click receiving cylinder 20.

  The click receiving cylinder 50 is fixed to the fixed cylinder by fastening the fastening member from the outer periphery toward the direction perpendicular to the optical axis. Such a configuration has a simpler structure than the click receiving cylinder 20, so that the manufacturing difficulty is reduced and the processing cost can be reduced.

  However, since the click receiving tube 50 needs to have a circular hole on the outer periphery, it is necessary to increase the total length of the tube in the optical axis direction compared to the click tube 20 in order to increase the strength. Further, since the click ball slides on the circumference of the click receiving portion, it is necessary to arrange the click receiving portion and the fastening elongated hole so as not to overlap in the optical axis direction. The practitioner may select and implement a required form from such characteristics.

  That is, the present invention provides a lens barrel capable of obtaining a suitable feeling of sliding by attaching a click receiving tube subjected to surface treatment to a fixed tube, and further adjusting the engagement between the fixed tube and a tripod mounting tube. In particular, the fixed cylinder 10 and the click receiving cylinder 20 having a click receiving portion 24 which are surface-treated differently from the fixed cylinder 10 and the outer periphery of the lens barrel can be rotated and slidable, and the tripod seat and the click receiving The tripod seat rotating cylinder 30 has a click means that can be inserted into and removed from the portion 24, and the click receiving cylinder 20 is fixed to the fixed cylinder 10.

DESCRIPTION OF SYMBOLS 10 Fixed cylinder 20 Click receiving cylinder 22 Fastening hole 24 Click receiving part 26 Fastening member 28 Chamfering part 30 Tripod mounting cylinder 32 Lock mechanism 34 Click ball 36 Energizing spring 40 Rear part 42 Mount part 50 Click receiving cylinder 52 Fastening length Hole 54 Click receiving part

Claims (7)

A click that has a surface treatment different from that of the fixed tube and the fixed tube and that has a click receiving portion, and a click that is slidable on the outer periphery of the lens barrel and that can be inserted into and removed from the tripod seat and the click receiving portion. A lens barrel, wherein the click receiving cylinder is fixed to the fixed cylinder.   The lens barrel according to claim 1, wherein the surface treatment is an addition treatment of an electroless nickel film.   The lens barrel according to any one of claims 1 to 2, wherein the click receiving tube is fixed to the fixed tube by inserting a fastening member into the elongated hole portion.   The lens barrel according to any one of claims 1 to 3, wherein the click receiving tube is fastened to the fixed tube by inserting the fastening member in an optical axis direction.   The lens barrel according to claim 1, wherein the click receiving tube is fastened to the fixed tube by inserting the fastening member in a direction perpendicular to the optical axis.   6. The click unit according to claim 1, further comprising a spherical member and a biasing unit that biases the spherical member in a direction perpendicular to the optical axis of the lens barrel. Lens barrel.   The lens barrel according to any one of claims 1 to 6, wherein the click receiving barrel has a chamfered portion on the object side of the lens barrel.

Images