JPH0980290A - Lens barrel provided with tripod mount base - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute zoom operation or focusing in macrophotographing without moving a tripod at the time of attaching the tripod in a lens barrel having a tripod mount base. SOLUTION: In a state where the lens barrel attaching part 10 of the tripod mount base 9 is inserted in the tripod mount base mount ring 3 of the lens barrel A so as to be bayonet-coupled and fixed by tightening a screw 13, an operation ring 4 whose movement in an optical axis direction is regulated by a rear side fixed barrel 1 and a front side fixed barrel 2 is turned, whereby both fixed barrels 1 and 2 mutually coupled with respect to the mount base 9 are moved in the optical axis direction by the helicoid-coupling between the helicoid 4a and the outer peripheral helicoid 3a of the ring 3 and engaging relation of the straight advance guide 1a of the fixed barrel 1 and the inner peripheral straight advance groove 3b of the ring 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens barrel having a tripod mount for an optical device such as a camera, and more particularly to a lens barrel suitable for macro photography.

[0002]

2. Description of the Related Art Conventionally, for example, in a macro lens, a camera and a lens barrel are often fixed on a tripod for photographing.
When I wanted to focus on a subject with a fixed magnification while fixed on a tripod, I moved the tripod back and forth to focus. Therefore, by attaching an adapter between the tripod and the tripod mounting seat, and operating the small operating member by engaging the rack gear and the pinion gear, it is possible to move the entire camera and lens barrel in the optical axis direction with respect to the tripod. There was something.

[0003]

However, when the rack gear and the pinion gear are engaged with each other by a small operation member as in the above-mentioned conventional example, when the weight of the camera and the lens barrel is large, the torque becomes large and the operation is performed. A large force was required to operate the member, and the operability was not good.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a lens barrel and a lens barrel holding device capable of adjusting the focus of a macro lens with proper operability.

[0005]

In order to achieve the above-mentioned object, the present invention as set forth in claim 1 is a lens barrel having a tripod mounting seat, wherein the lens barrel is mounted in the optical axis direction with respect to the tripod mounting seat. It was made to move. Similarly, the present invention according to claim 2 is such that the lens barrel is moved in the optical axis direction with respect to the tripod mount by an operation ring that rotates about the optical axis.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention as set forth in claim 1 is a lens barrel having a tripod mount, and means for moving the lens barrel in the optical axis direction with respect to the tripod mount. According to the present invention as defined in claim 2, there is provided an operation ring which rotates about the optical axis, and the optical axis direction moving means of the lens barrel is actuated by the rotation operation of the operation ring.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIG. FIG. 1 is an exploded cross-sectional view of a main part of a lens barrel having a tripod mount according to this embodiment. In the figure, A is a lens barrel and B is a lens barrel holding device. Reference numeral 1 denotes a rear fixed cylinder of the lens barrel A, a tripod mounting seat mounting ring 3 described later is fitted on the outer periphery thereof, and a straight guide 1a is provided on the outer periphery on the front end side thereof. Reference numeral 2 denotes a front side fixed barrel of the lens barrel A, which is fixed to a front end portion of the rear fixed barrel 1 with a screw 5. Reference numeral 3 denotes a tripod mount mounting ring, which is provided with a helicoid 3a on the outer periphery on the front end side thereof and a rectilinear groove 3b on the inner peripheral side thereof, and the rectilinear groove 3b is the rectilinear guide 1a of the rear fixed cylinder 1. Is engaged with.

Reference numeral 4 denotes an operation ring, which is mounted on the outer peripheral portions of the rear fixed barrel 1 and the front fixed barrel 2 so that the movement in the optical axis direction is restricted, and the helicoid 4a is provided on the inner peripheral side thereof. 4a is helicoidally coupled with the helicoid 3a of the tripod mount mounting ring 3. An operation rubber 6 is provided on the outer circumference of the operation ring 4 to prevent the fingers from slipping during the operation. Reference numeral 7 denotes a mount, which is provided at the rear end of the rear fixed cylinder 1 and is coupled to a camera mount (not shown) by a bayonet. Reference numeral 8 denotes a bayonet screw, which is screwed onto the outer circumference of the tripod mounting ring 3 at several points.

Reference numeral 9 denotes a tripod mount which constitutes the lens barrel holding device B, and is attached to a tripod (not shown) by a tap 9a.
Reference numeral 10 denotes a ring-shaped lens barrel mounting portion which is connected to the tripod mounting seat 9, and several fitting grooves 11 for fitting with the bayonet screw 8 are provided on the inner peripheral surface thereof. Each of the fitting grooves 11 has an opening and forms a bayonet. Reference numeral 12 denotes a C ring made of a resin material or the like provided on the inner peripheral surface of the lens barrel mounting portion 10 for fastening the tripod mounting seat 9 to the tripod mounting seat mounting ring 3 of the lens barrel A with screws 13.

The operation of this embodiment having the above construction will be described. First, in order to mount the lens barrel holding device B on the lens barrel A, the screw 13 is loosened and a predetermined phase (the bayonet screw 8 of the lens barrel A and the fitting groove 11 of the lens barrel holding device B is set. At the opening 7) of the lens barrel A from the mount 7 side to a position where the fitting groove 11 and the bayonet screw 8 fit, and is rotated to the normal use phase, and the screw 13
Tighten to hold. In this state, the lens barrel A and the lens barrel holding device B are attached to a tripod (not shown) by the tap 9a. At this time, the tripod mounting seat 9, the lens barrel mounting portion 10, and the tripod mounting seat mounting ring 3 are fixed portions.

Therefore, when the operation ring 4 is rotated,
The helicoid 4a provided on the inner circumference thereof and the helicoid 3a of the tripod mounting seat mounting ring 3 are coupled to each other by the helicoid so that the operation ring 4 is rotated and fed out. However, the operation ring 4 is restricted from moving in the optical axis direction by the rear fixed barrel 1 and the front fixed barrel 2, and the straight guide 1a provided on the rear fixed barrel 1 is aligned with the straight groove 3b of the tripod mount ring 3. Since they are engaged, when the operation ring 4 is turned out, the rear fixed barrel 1 and the front fixed barrel 2 move straight.

FIG. 2 shows a second embodiment of the present invention. FIG. 2 is an exploded cross-sectional view of a main part of a lens barrel having a tripod mount according to this embodiment. Since the lens barrel holding device B has the same configuration as that of the first embodiment, the same reference numerals are given and the description thereof is omitted. In the figure, 21 is a fixed barrel of the lens barrel A, a helicoid 21a is provided on the outer periphery thereof, and a straight guide 21b is provided on the outer periphery of its rear portion.
Is provided. Reference numeral 22 denotes a straight guide tube, which is the fixed tube 2
1 is fitted on the outer circumference of the rear portion, and a straight groove 22a that engages with the straight guide 21b of the fixed cylinder 21 is provided on the inner circumference thereof. Reference numeral 23 denotes a tripod mounting ring, the front portion of which is superposed on the outer periphery of the straight guide cylinder 22 and is fitted on the outer periphery of the rear portion of the fixed cylinder 21.

Reference numeral 24 is an operating ring, and a helicoid 24a provided on the inner periphery of the operating ring is helicoid-coupled with the helicoid 21a of the fixed barrel 21, and the straight guide barrel 22 is also provided.
And the tripod mount mounting ring 23 restricts the movement in the optical axis direction. An operation rubber 25 is provided on the outer circumference of the operation ring 24 in order to prevent the fingers from slipping during the operation. Reference numeral 26 denotes a mount, which is fixed to the rear end portion of the fixed cylinder 21 so as to be bayonet-coupled with a camera mount (not shown). Reference numeral 27 denotes a bayonet screw, which is screwed into several places on the outer periphery of the tripod mounting seat mounting ring 23, and the straight guide cylinder 22 and the tripod mounting seat mounting ring 2 are attached.
3 and 3 are integrally fixed, and when the lens barrel holding device B is mounted, they are bayonet-coupled with the fitting groove 11 of the lens barrel mounting portion 10.

The operation of this embodiment having the above configuration will be described.
First, the lens barrel holding device B is attached to the lens barrel A in the same manner as in the first embodiment. Therefore, when the operation ring 24 is rotated, the operation ring 24
Is restricted in its movement in the optical axis direction by the rectilinear guide cylinder 22 and the tripod mounting seat mounting ring 23, so that the helicoid 24a of the operation ring 24 and the helicoid 21a of the fixed cylinder 21 are rotated. The straight guide groove 21 of the straight guide 21b of the connecting and fixing cylinder 21 and the straight guide groove 22 of the straight guide cylinder 22.
Due to the engagement with 2a, the fixed cylinder 21 is attached to the tripod mounting seat 9.
Goes straight.

[0015]

As described above, the present invention as set forth in claim 1 is a lens barrel having a tripod mount for fixing and holding the lens barrel on a tripod. By including the means for moving in the axial direction, it becomes possible to perform zoom operation and focus adjustment in macro shooting without moving the tripod. Further, the present invention according to claim 2 has an operation ring which rotates about the optical axis, and a tripod is provided by operating the optical axis direction moving means of the lens barrel by the rotation operation of the operation ring. On the other hand, the operation of moving the lens barrel in the optical axis direction can be smoothly performed.

[Brief description of drawings]

FIG. 1 is an exploded sectional view of a lens barrel having a tripod mount according to a first embodiment of the present invention.

FIG. 2 is an exploded sectional view of a lens barrel having a tripod mount according to a second embodiment of the present invention.

[Explanation of symbols]

A ... lens barrel, B ... lens barrel holding device, 1 ...
Rear fixed cylinder, 1a ... Straight guide, 2 ... Front fixed cylinder,
3 ... Tripod mounting seat mounting ring, 3a ... Helicoid, 3
b ・ ・ Straight groove, 4 ・ ・ Operating ring, 4a ・ ・ Helicoid, 7 ・ ・ Mount, 9 ・ ・ Tripod mounting seat, 9a ・ ・ Tap, 10 ・ ・ Lens barrel mounting part, 21 ・ ・ Fixed barrel, 21a ・・
Helicoid, 21b ··· Straight guide, 22 · · Straight guide tube, 22a · · Straight groove, 23 · · Tripod mounting seat mounting ring, 24 · · Operation ring, 24a · · Helicoid, 26
··mount.

Claims (2)

[Claims] 1. A lens barrel having a tripod mount, comprising means for moving the lens barrel in the optical axis direction with respect to the tripod mount. 2. An operation ring which rotates about an optical axis as a center, and an optical axis direction moving means of the lens barrel is operated by a rotating operation of the operation ring.
The lens barrel described.