JPH11218667A - Optical lens barrel and optical equipment using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a 2nd cylinder member to be smoothly inserted and easily incorporated without being caught by a 1st cylinder member by providing a guide part which has such as internal diameter that the 2nd cylinder member can be guided to a restriction part without contacting, on the side of the large- diameter cylinder member where the small-diameter 2nd cylinder member is incorporated. SOLUTION: On the side of a female helicoid ring 9 where a male helicoid ring 8 is incorporated, the guide part 9b having such an internal diameter that the male helicoid ring 8 can be guided to a slide contact rib 9d without contacting is provided integrally with the female helicoid ring 9. The guide part 9b projects annually from the end part 9c of the slide contact rib 9d of the female helicoid ring 9 on the incorporation side for the male helicoid ring 8 to the side of the male helicoid ring 8 and its internal diameter is larger than the crest diameter of helicoid screws 8c and 8d of the male helicoid ring 8. Consequently, when the male helicoid ring 8 is incorporated in the female helicoid ring 9, the male helicoid ring 8 can smoothly be inserted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a female helicoid ring (first cylindrical member) and a male helicoid ring (second cylindrical member) and a helicoid screw (screw element) for displacing a lens (optical member). TECHNICAL FIELD The present invention relates to an optical lens barrel having a structure screwed so as to be relatively rotatable with each other via an optical device, and an optical device such as a camera using the optical lens barrel.

[0002]

2. Description of the Related Art A lens barrel (optical barrel) used for an optical apparatus such as a camera or a video camera generally requires a high-precision dimensional tolerance. As described above, processing by molding a plastic or the like is desirable from the viewpoint of reducing cost and product weight. Conventionally, in order to move the lens barrel including the focus lens group in the optical axis direction for focusing, it is common to use a helicoid screw to rotate the lens barrel, and the lens barrel including the helicoid screw is also made of plastic. Made by molding.

FIG. 5 is a perspective view of a conventional female helicoid ring (first cylindrical member) and a male helicoid ring (second cylindrical member).

In FIG. 5, a female helicoid ring 50 has
A helicoid screw 51 is provided on the inner diameter, and a male helicoid ring 60 is provided.
Is provided with a helicoid screw portion 61 in the outer diameter portion.

Usually, a lens barrel in which a plurality of helicoid screws are provided on the inner diameter portion (inner peripheral side) of the female helicoid ring is slid in the inner diameter in order to eliminate the undercut of the groove between the helicoid screws. Is large due to the mold structure, so that the female helicoid ring 50 shown in FIG.
As described above, the size of the thread is determined by the set number of threads (design number of threads) of the helicoid screw 51, a plurality of helicoid screws are deleted, and only one helicoid screw 51 is used. Simple mold structure is possible.

On the other hand, since the male helicoid ring 60 is usually formed by a three-way (or six-way) outer slide mold structure, the outer diameter portion has a set number of three helicoid screws 61a, 61a, 61b and 61c are all provided.

FIG. 4 is an enlarged sectional view in which the above-mentioned conventional female helicoid ring 50 and male helicoid ring 60 are incorporated. The female helicoid ring 50 is thrust by helicoid screw 51 and helicoid screws 61a and 61b of male helicoid ring 60. A plurality of slidable contact ribs (restriction portions) 52a, 52b, 52c, 52d and the protrusion 5 which are regulated and are substantially parallel to the optical axis.
3 is radially regulated by fitting (contacting) the threads of each of the helicoid screws 61 a, 61 b, 61 c provided on the male helicoid ring 60, and the female helicoid ring 50 rotates along the lead of the helicoid screw portion 61. It is paid out.

When assembling the female helicoid ring 50 and the male helicoid ring 60 described above, the female helicoid ring 5
In order to prevent the helicoid screw 51 of the male helicoid ring 60 from being assembled between the regular helicoid screws 61a and 61b of the male helicoid ring 60 and being mistakenly assembled between, for example, 61a and 61c, the helicoid screw 51 is replaced with a regular helicoid screw. A concave portion 62 is provided in the male helicoid ring 60 so as to be assembled only between the screws 61a and 61b, and the groove diameter between the other helicoid screws 61a and 61c is made larger than the minimum diameter of the helicoid screw 51 so that it can be assembled only at a regular position. Known lens barrels are known.

[0009]

However, in the lens barrel described above, when the female helicoid ring 50 is rotated and extended, the male helicoid ring 60 is fitted with the threads of the respective helicoid screws 61a, 61b, 61c. (Contact) to radially regulate the female helicoid ring 50
The ends 52e of the female helicoid ring 50 and the male helicoid ring 60 are attached to the end 5e of the female helicoid ring 50.
0a, the female helicoid ring 50
When the male helicoid ring 60 and the male helicoid ring 60 are incorporated, the ends 52e of the sliding contact ribs 52a and 52b provided on the female helicoid ring 50
The outermost helicoid screw 61c of the portion tends to be caught by the slope 61d, making it difficult to assemble.

The present invention is a further development of the above-mentioned prior art, and has as its object to assemble a first cylindrical member having a large diameter and a second cylindrical member having a small diameter so as to be relatively rotatable by screw elements which are screwed together. Another object of the present invention is to provide an optical lens barrel that can be smoothly inserted into the second cylindrical member without being caught by the first cylindrical member and can be easily assembled, and an optical apparatus using the same.

[0011]

SUMMARY OF THE INVENTION An optical lens barrel according to the present invention includes: [1] a screw element in which a large-diameter first cylindrical member and a small-diameter second cylindrical member are screwed together so that the optical member can be displaced. In the optical lens barrel having a restricting portion that is relatively rotatably assembled and the first cylindrical member radially restricts a screw element of the second cylindrical member, the first cylindrical member is provided with the second cylindrical member. A guide portion having an inner diameter capable of guiding the second cylindrical member to the regulating portion in a non-contact state is provided on the assembly side.

In particular, [1-1]: in the optical lens barrel according to the above [1], the guide portion is formed to have an inner diameter larger than a thread diameter of a screw element of the second cylindrical member. 1-2]: In the optical lens barrel according to the above [1] or [1-1], the regulating portion has an inclined surface having a gentle slope toward the inner diameter portion of the guide portion at an end on the assembly side. [1-3]: In the above [1], [1-1] or [1-2], the first cylinder member has one helicoid screw as a screw element, and the second cylinder member The member has at least two helicoid screws as screw elements for thrust-controlling one helicoid screw of the first cylindrical member.

Further, the optical apparatus of the present invention may include the following [2]: [1], [1-1], [1-2] or [1].
[3] The optical column described in [3] is used.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail based on embodiments shown in the accompanying drawings. In the present embodiment, as an optical lens barrel, a focus structure used for a photographing lens (optical member), in particular, a female helicoid ring and a male helicoid ring are screwed so as to be relatively rotatable via a helicoid screw. 1 illustrates a lens barrel having a structure.

FIG. 1 is a longitudinal sectional view of the lens barrel of the present embodiment, FIG. 2 is an enlarged sectional view of a main part of the lens barrel shown in FIG. 1, and FIG. 3 is a female helicoid ring of the lens barrel shown in FIG. FIG. 4 is a perspective view showing a state before the male helicoid ring and the male helicoid ring are assembled.

In FIG. 1, reference numeral 1 denotes a fixed barrel integrally formed with a lens mount to be mounted on a camera body (not shown). Zoom operation ring that can be rotated with
Reference numeral 4 denotes a zoom rubber wound around the zoom operation ring 2, and reference numeral 5 denotes a cam which is coupled to the zoom operation ring 2 by screws 13, is thrust-restricted in the optical axis direction, and is rotatable with respect to the fixed cylinder 1. It is a tube. Several convex lead cams (or non-linear cams) 5 a and 5 b are formed on the inner peripheral surface of the cam cylinder 5. Reference numeral 6 denotes a rear group lens barrel having concave cam followers 6a and 6b fitted with the lead cams 5a and 5b and notches 6c and 6d having a substantially U shape on the outer peripheral surface. And a straight guide member which is fixed to the notches 6c and 6d in the width direction.

Reference numeral 8 denotes a male helicoid ring (second cylindrical member). The male helicoid ring 8 has a substantially spiral shape which engages with cam followers 5c and 5d provided on the inner peripheral surface of the cam cylinder 5 on the outer peripheral surface thereof. The protrusion 8a formed on the outer peripheral surface of the rear end portion is engaged with the straight guide groove 1a provided on the fixed cylinder 1.

Reference numeral 9 denotes a female helicoid ring (first cylindrical member). A single helicoid screw (screw element) 9a provided on the inner peripheral surface of the female helicoid ring 9a is formed on the outer peripheral surface of the distal end of the male helicoid ring 8. Helicoidally connected to the helicoid screws 8c and 8d (screw elements). The female helicoid ring 50 is a cam follower 5 of the male helicoid ring 8 with a helicoid screw 9a.
A plurality of sliding contact ribs (restriction portions) 9d that are thrust-restricted by helicoid screws 8c and 8d provided on the outer peripheral surface opposite to c and 5d and are substantially parallel to the optical axis provided on the inner peripheral surface of female helicoid ring 50. The protrusion 9e is radially regulated by fitting (contacting) the threads of the helicoid screws 8c and 8d of the male helicoid ring 8.

Reference numeral 11 denotes a front lens barrel which is screwed (not shown) to the female helicoid ring 9; and 10, an electric diaphragm device.

Next, the operation of the lens barrel according to the present embodiment will be described.

First, when the zoom operation ring 2 is rotated, the cam barrel 5 is rotated by the same amount and in the same direction as the zoom operation ring 2, and the lead cam 5 formed on the inner peripheral side of the cam cylinder 5 is rotated.
The rear lens barrel 6 is guided by the rectilinear guide member 7 via the cam followers 6a and 6b fitted with the cam cylinders 5a and 5b to advance and retreat in the optical axis direction. The male helicoid ring 8 is guided by the rectilinear guide groove 1a of the fixed cylinder 1 and moves rectilinearly by the substantially spiral convex cam 8b fitted to the cam followers 5c and 5d. Helicoid ring 9;
The front lens barrel 11 moves back and forth in the optical axis direction for zooming (magnification)
Is performed, and by rotating the female helicoid ring 9, a helicoid screw 9 formed on the inner peripheral side of the female helicoid ring 9 is formed.
a, and the helicoid screws 8b and 8c formed on the outer peripheral side of the distal end of the male helicoid ring 8 are rotationally fed (retracted) along the helicoid lead, and focusing is performed.

In the lens barrel according to the present embodiment, the male helicoid ring 8 can be smoothly inserted without being caught by the female helicoid ring 9 and can be easily assembled, as shown in FIGS. A guide portion 9b having an inner diameter capable of guiding the male helicoid ring 8 to the sliding contact rib 9d in a non-contact state is provided integrally with the female helicoid ring 9 on the side where the female helicoid ring 9 and the male helicoid ring 8 are assembled. As shown in FIGS. 2 and 3, the guide portion 9 b is provided with the male helicoid ring 8 of the sliding contact rib 9 d of the female helicoid ring 9.
And protrudes in an annular shape from the end 9c of the male helicoid ring 8 toward the male helicoid ring 8 side. Thereby, when assembling the male helicoid ring 8 to the female helicoid ring 9, it is avoided that the slope 8 e 1 of the outermost helicoid screw 8 e of the male helicoid ring 8 and the end 9 c of the rib 9 d slide on the female helicoid ring 9. Therefore, the male helicoid ring 8 can be inserted smoothly without being caught by the sliding rib 9d of the female helicoid ring 9.

The sliding contact rib 9d of the female helicoid ring 9
As shown in FIGS. 1 to 3, a male helicoid ring 8 is provided.
The end 9c on the assembly side with the nose is formed on a slope having a gentle slope toward the inner diameter of the guide portion. Thereby, when assembling the male helicoid ring 8 to the female helicoid ring 9, the male helicoid ring 8 and the female helicoid ring 9 can be aligned.

In the lens barrel according to the present embodiment configured as described above, the inner diameter D1 of the guide portion 9b of the female helicoid ring 9 is set to the helicoid screws 8c and 8 of the male helicoid ring 8.
Since the diameter D is larger than the peak diameter D2, the male helicoid ring 8 can be smoothly inserted into the female helicoid ring 9 without being caught by the sliding contact rib 9d, and the female helicoid ring 9 and the male helicoid ring 8 can be easily assembled.

Further, the male helicoid ring 8 of the sliding contact rib 9d
Slope 9c with gentle slope at the end on the assembly side
Since the shafts of both can be set by providing the male helicoid ring 8, the male helicoid ring 8 and the female helicoid ring 9 can be quickly screwed together after the male helicoid ring 8 is inserted into the female helicoid ring 9.

Thus, the helicoid screws 9a, 8 for screwing the female helicoid ring 9 and the male helicoid ring 8 together.
When the male helicoid ring 8 is mounted so as to be relatively rotatable by c and 8d, the male helicoid ring 8 can be smoothly inserted without being caught by the female helicoid ring 9 and can be easily assembled.

In the present embodiment, a lens barrel in which the female helicoid ring 9 is provided with a guide portion 9b having an inner diameter capable of guiding the male helicoid ring 8 to the sliding contact rib 9d in a non-contact state is exemplified. The optical lens barrels have helicoid screws 9a, 8c, 8d of female helicoid ring 9 and male helicoid ring 8, respectively.
Also, the present invention can be applied to a lens barrel having the sliding contact rib 9d in the reverse mode.

The configuration of such a lens barrel will be described in detail. The female helicoid ring 9 has a plurality of helicoid screws (8c, 8d, 8e) on the inner peripheral surface as described above, and the male helicoid ring 8 has On the outer peripheral surface, one helicoid screw (9
a) and a sliding contact rib (9d), a guide having an inner diameter capable of guiding the female helicoid ring 9 to the sliding contact rib (9d) in a non-contact state on the side where the male helicoid ring 8 and the female helicoid ring 9 are assembled. A part (9b) can be provided. The guide portion (9b) of the male helicoid ring 8 has a helicoid screw (8c, 8d, 8
e) is formed so as to have a larger diameter than the ridge diameter, and the end of the sliding contact rib (9d) on the mounting side with the female helicoid ring 9 has a gentle slope toward the inner diameter of the guide part (9b). It is formed on the slope (9c) of the shape.

Therefore, even in a lens barrel in which the helicoid screws 9a, 8c, 8d and the sliding contact rib 9d of the female helicoid ring 9 and the male helicoid ring 8 are reversed, the male helicoid ring 8 is caught by the female helicoid ring 9. Therefore, it is possible to obtain an effect that it can be inserted smoothly and can be easily assembled.

The lens barrel as the optical barrel according to the present embodiment is used for an optical device such as a camera or a video camera.

[0031]

As described above, according to the present invention,
A guide portion having an inner diameter capable of guiding the second cylindrical member in a non-contact state to the regulating portion is provided on the side of the large-diameter first cylindrical member that is assembled with the small-diameter second cylindrical member. When assembling the two cylindrical members so as to be relatively rotatable by screw elements screwed to each other, the optical barrel that can be smoothly inserted without being caught by the first cylindrical member and can be easily assembled, and the use thereof. Optical equipment was realized.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a lens barrel according to the present embodiment.

FIG. 2 is an enlarged sectional view of a main part of the lens barrel shown in FIG.

FIG. 3 is a perspective view showing a state before assembling a female helicoid ring and a male helicoid ring of the lens barrel shown in FIG. 1;

FIG. 4 is an enlarged sectional view of a main part of a conventional lens barrel.

FIG. 5 is a perspective view showing a state before assembling a female helicoid ring and a male helicoid ring of a conventional lens barrel.

[Explanation of symbols]

 Reference Signs List 8 Male helicoid ring (second cylindrical member) 8c, 8d Helicoid screw (screw element) 9 Female helicoid ring (first cylindrical member) 9a Helicoid screw (screw element) 9b Guide 9c Slope 9d Sliding contact rib (regulating part)

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Jun Sugita 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc.

Claims (5)

[Claims] A first cylindrical member having a large diameter and a second cylindrical member having a small diameter are relatively rotatably assembled via a screw element screwed to each other so that the optical member can be displaced; In an optical barrel having a restricting portion for radially restricting a screw element of a second cylindrical member, the first cylindrical member is in a non-contact state to the restricting portion with the second cylindrical member on an assembly side with the second cylindrical member. An optical lens barrel provided with a guide portion having an inner diameter capable of guiding. 2. The optical lens barrel according to claim 1, wherein the guide portion is formed to have an inner diameter larger than a diameter of a screw element of the second cylindrical member. 3. The optical device according to claim 1, wherein the regulating portion has an inclined surface having a gentle slope toward an inner diameter portion of the guide portion at an end on an assembly side. Lens barrel. 4. The first cylindrical member has one helicoid screw as a screw element, and the second cylindrical member has at least two helicoid screws as a screw element for thrust-controlling one helicoid screw of the first cylindrical member. The optical lens barrel according to any one of claims 1 to 3, further comprising a helicoid screw. 5. An optical apparatus using the optical lens barrel according to claim 1.