JPH09243897A - Lens barrel and optical equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize miniaturization and to improve outside appearance and operability by constituting an operating member for moving a lens of two or more members fit to relatively move in an optical axis direction. SOLUTION: A ring 1 functioning as a 1st zoom operating member is fit on the outside of a ring 2 functioning as a 2nd zoom operating member so that it can relatively move in the optical axis direction. When the ring 1 is pulled out forward to a wide position and rotated, rotational force is transmitted to the ring 2. The rotational force of the ring 2 is transmitted to a cam ring 4, and the cam ring 4 moves to a telephoto position in the optical axis direction while it is turned within a zoom operation range. A straight advance barrel 5 is moved in the optical axis direction by the same amount as the moving amount of the cam ring 4. By rotating the cam ring 4, a front group moving ring 6 and a rear group lens barrel 8 are moved in the optical axis direction to perform zooming operation. By rotating a front group lens barrel 7, only a front group lens L1 is moved in the optical axis direction to perform focusing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens barrel in which a lens housed in a lens barrel main body can be moved in the optical axis direction by operating an operating member, and a liquid crystal projector, a steel camera to which the lens barrel is applied, The present invention relates to an optical device such as a video camera.

[0002]

2. Description of the Related Art Heretofore, many lens barrels of this type have been proposed in which a cam wrist is extended to accommodate a lens. The total length of the projection lens for a liquid crystal projector to which such a lens barrel is applied is determined by the optical system of the projection lens.
However, recent products are required to be smaller, and projection lenses are also required to hold down the entire optical system.

[0003]

Since the conventional lens barrel is constructed as described above, the operating member has to be constructed so as to project from the surface of the product, which increases the product space and increases the size of the product. The appearance was poor and the operability was poor. Further, there is a problem that the front-group-related member is an obstacle to shortening the overall length of the lens barrel when the overall length of the lens barrel is short and wide.

The present invention has been made in order to solve the above problems, and the operating member can be contracted in the direction of the optical axis, and the front group related member can also be contracted in the lens barrel main body to reduce the size. It is an object of the present invention to obtain a lens barrel having an improved appearance and operability and an optical device to which the lens barrel is applied.

[0005]

According to a first aspect of the present invention, there is provided a lens barrel, wherein the lens housed in the barrel body is movable in the optical axis direction by operating an operating member. It is composed of two or more members that are fitted together so as to be relatively movable in the optical axis direction.

The lens barrel according to the second aspect of the invention is
The operation member composed of two or more members has a straight guide and a rotation guide on the inner surface of the inner operation member, and a straight guide on the outer side.

The lens barrel according to the invention of claim 3 is
A lens barrel in which a lens housed in a lens barrel main body can be moved in the optical axis direction by operating an operating member. The lens barrel is composed of two or more members in which the operating member is fitted so as to be relatively movable in the optical axis direction. A cam member that transmits the operating force of the operating member rotatably radially fitted to the outer surface of the lens barrel body to the lens driving member inside the lens barrel body, and moves in the optical axis direction according to the cam locus of the cam member. A front group moving ring and a rear group lens barrel are provided.

The lens barrel according to the invention of claim 4 is
A first operation member that is rotatably fitted to the outside of the lens barrel body, and is relatively movable in the optical axis direction to the outside of the first operation member and is rotatable integrally with the first operation member. A second operation member provided in the lens barrel main body and rotatably fitted inside the lens barrel main body and penetrating through a cam groove formed in the lens barrel main body.
And a front group moving ring and a rear group lens barrel having a frame engaged with the cam of the cam member, and a cam groove of the lens barrel body is wide. An extension cam for storing from the end, an extension cam for storing from the wide end of the cam of the front group moving ring of the cam member, and a cam for the rear group lens barrel extends for storing from the wide end It has a cam and a cam for stationary rotation at the wide end.

A lens barrel according to the invention of claim 5 is
The lens moving end recognizing means is provided.

A lens barrel according to the invention of claim 6 is
The front lens barrel is provided on the front lens group moving ring so as to be movable in the optical axis direction.

According to a seventh aspect of the present invention, there is provided an optical apparatus including the lens barrel according to any one of the first to sixth aspects.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1. 1 is a transverse sectional view of a lens barrel showing a first embodiment of the present invention. The illustrated example is a zoom lens, in which the upper stage is in a wide state and the lower stage is in a telephoto state.
FIG. 2 is a transverse sectional view of FIG. 1. In the figure, reference numeral 1 denotes a ring as a first zoom operating member, which is radially fitted to the outside of a ring 2 as a second zoom operating member so as to be movable relative to the optical axis direction.

In the straight groove 2a formed in the outer surface of the ring 2 in parallel with the axis, the straight piece 1 provided in the ring 1 is inserted.
0 engages to form a straight-ahead guide mechanism. Further, the click plate 11 provided on the ring 1 that engages with the recess 2b formed on the outer surface of the ring 2 is used to configure a click mechanism as a lens moving end recognition means. Also, ring 2
The inner surface has a straight guide 2c and a rotation guide 2d.

Reference numeral 3 is a fixed cylinder, and the ring 2 is bayonet-coupled on the outer diameter side by the unevenness provided on both sides. As shown in the development view of FIG.
A cam lift 3a that obtains a certain movement amount B (set according to the allowable space) with respect to the movement amounts A and A'of the entire front group and rear group.
-1 and a cam 3a, which extends from the wide end of the cam lift 3a and includes a cam lift 3a-2 for storage, are formed at three locations on the circumference at substantially equal intervals.

Reference numeral 4 denotes a cam ring rotatably fitted to the inner diameter side of the fixed barrel 3, and a roller shaft 13c provided on the outer surface of the cam ring 4 is engaged with the cam 3a. This cam ring 4
As shown in the development view of FIG. 4, the remaining movement amount A for the front group is
-B cam list 4a-1 and cam list 4a-2 which extends from the wide end of this cam list and is stored and the cam list 4 of the remaining movement amount A'-B for the rear group.
A cam 4b formed by b-1 and a cam list 4b-2 which extends from the wide end of the cam list when stored and a stationary rotation cam 4c are formed at three positions on the circumference at substantially equal intervals. The cam ring 4 and the fixed barrel 3 are stopper screws 15
The zoom range is regulated by.

Reference numeral 5 denotes a straight-moving cylinder, which is radially fitted to the inner diameter side of the cam ring 4, and a straight-moving shaft screw 9 provided on the straight-moving cylinder 5 linearly moves the stationary rotation cam 4c of the cam ring 4 and the fixed cylinder 3. It engages with the groove 3b and is movable in the optical axis direction together with the cam ring.

Reference numeral 6 denotes a front group moving ring radially fitted to the inner diameter side of the straight-moving barrel 5, and a roller shaft 13a provided on the outer surface of the front group moving ring 6 penetrates through the straight-moving barrel 5 to make a cam ring 4 of the cam ring 4. It is engaged with the cam 4a. Reference numeral 7 denotes a front group lens barrel, which holds the front group lens L1, is helicoidally (H / C) coupled (can also be a cam) with the front group moving ring 6, and the focus range is regulated by a focus stopper screw 12. .

Reference numeral 8 denotes a rear group lens barrel that is radially fitted to the inner diameter side of the rectilinear barrel 5, holds the rear group lens L2, and a roller shaft 13b provided on the outer surface of the rear group barrel 8 has a roller shaft 13b. Is engaged with the cam 4b of the cam ring 4.

FIG. 5 is a front view of the lens barrel, showing the product main body 16 and the ring 1, in which fingertips are inserted from the notch spaces 16a on both sides and the ring 1 is pulled out from the ring 2 in the optical axis direction. There is. Reference numeral 17 is an optical device in which the product body 16 is mounted.

Next, the operation will be described. FIG. 6 shows the operating state of the lens barrel, in which (a) is the stored state,
(B) is a wide state, (c) is a tele state.

In the stored state of FIG. 6 (a), the fingertips are inserted from the notch spaces 16a on both sides to grasp the ring 1,
When pulled forward, the straight advancing piece 10 moves in the straight advancing groove 2a, and the ring 1 can be pulled out forward to the wide (WIDE) position shown in FIG. it can. Then, when the ring 1 is rotated, the rotational force is transmitted to the ring 2 through the straight advancing piece 10 and the straight advancing groove 2a, and the ring rotates at a fixed position. The rotational force of the ring 2 is transmitted to the cam ring 4 via the roller shaft 13c, and the cam ring 4 rotates along the cam wrist 3a-2.

When the cam ring 4 reaches the end of the cam list 3a-2, it is guided by the cam list 3a-1 and is shown in FIG. 6 (c).
While moving the zoom operation range to the tele position shown in (4), it moves in the optical axis direction. On the other hand, since the linear movement screw 5 is engaged with the stationary rotation cam 4c of the cam ring 4, the linear movement cylinder 5 moves in the optical axis direction by the same amount as the movement amount of the cam ring 4. When the cam ring 4 rotates, the roller shafts 13a and 13b are guided by the front-group and rear-group cam wrists 4a-1 and 4b-1, so that the front-group moving ring 6 and the rear-group lens barrel 8 are moved to the optical axes. Move in the direction and perform zooming operation.

On the other hand, since the front lens barrel 7 is helicoidally connected to the front lens barrel 6, when the front lens barrel 7 is rotated,
Only the front lens group L1 can move in the optical axis direction for focusing.

Next, the operation of housing the lens barrel will be described. In this case, when the ring 1 is operated to rotate the cam ring 4 in the direction opposite to that during zooming, the front group moving ring 6 is moved.
And the rear lens barrel 8 are the cam groups 4a-1 for the front lens group and the rear lens group.
4b-1 guides the vehicle from the telephoto state shown in FIG. 6C to the wide state shown in FIG. 6B. Go straight 1 at this position
0 corresponds to the cam list 3a-2 at the time of storage, and the roller shaft 13
Since a and 13b match the cam wrists 4a-2 and 4b-2 at the time of storage, the ring 1 can be fixedly rotated,
The stationary rotation of the cam ring 4 allows the roller shafts 13a and 13b to enter the cam wrists 4a-2 and 4b-2 and be held in the housed state.

In this state, the ring 1 can be retracted and stored with respect to the ring 2 by the straight advancing piece 10 and the straight advancing groove 2a.
Further, by rotating the front lens barrel 7 to be housed in the front lens group moving ring 6, the total length of the lens barrel can be shortened in combination with the above points.

[0026]

As described above, according to the present invention, since the operation member for moving the lens is composed of two or more members fitted so as to be relatively movable in the optical axis direction, the operation member is the optical axis. It has a simple structure in which it is slid in a certain direction, and there is an effect that the total length of the lens barrel can be suppressed within a limited range of a certain space and the size can be reduced. Further, since the front-group-related member is also configured to be contractible inside the lens barrel main body, it is possible to further reduce the size in view of the above points, and to obtain a lens barrel and an optical device having a good appearance. Is effective.

[Brief description of drawings]

FIG. 1 is an enlarged vertical sectional view of a main part of a lens barrel showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of FIG.

FIG. 3 is a developed plan view of a fixed barrel.

FIG. 4 is a developed plan view of a cam ring.

FIG. 5 is a front view of a lens barrel showing an embodiment of the present invention.

6 is a vertical cross-sectional view of the lens barrel of FIG. 5 when stored.

7 is a vertical sectional view of the lens barrel of FIG. 5 at the time of telephoto.

8 is a transverse sectional view of the lens barrel of FIG. 5 at the time of telephoto.

[Explanation of symbols]

 1 Ring as a first operating member (operating member) 2 Ring as a second operating member (operating member) 3 Fixed barrel (lens barrel body) 4 Cam ring (lens driving member) 5 Straight barrel (lens driving member) 9 straight advance shaft screw 10 straight advance piece (transmission member) 12 focus stopper screw (transmission member) 13a to 13c roller shaft (transmission member)

Claims (7)

[Claims] 1. A lens barrel in which a lens housed in a barrel body is movable in an optical axis direction by operating an operating member,
A lens barrel, comprising: two or more members in which the operation member is fitted so as to be relatively movable in the optical axis direction. 2. The operation member composed of two or more members,
The lens barrel according to claim 1, wherein the operation member on the inner side has a straight guide and a rotation guide on the inner surface, and the outer guide has a straight guide. 3. A lens barrel in which a lens housed in the barrel body is movable in the optical axis direction by operating an operating member,
The operation member is composed of two or more members that are fitted so as to be relatively movable in the optical axis direction, and the operation force of the operation member that is diametrically fitted to the outer surface of the lens barrel main body is applied to the inside of the lens barrel main body. A lens barrel comprising: a cam member that transmits to a lens driving member; and a front lens group moving ring and a rear lens barrel that move in the optical axis direction according to the cam locus of the cam member. 4. A first operation member rotatably fitted to the outside of the lens barrel body, and a first operation member which is relatively movable in the optical axis direction to the outside of the first operation member. A second operating member rotatably provided integrally with the member, and a second operating member rotatably fitted inside the lens barrel main body and penetrating through a cam groove formed in the lens barrel main body to engage with the first operating member. A front group moving ring and a rear group lens barrel having a frame engaged with the cam of the cam member, and the lens barrel body cam groove extends from the wide end for storage. A cam for the front group moving ring of the cam member, and an extension cam for storing from the wide end of the cam, and a cam for the rear group lens barrel from the wide end to the extension cam for storing and the wide end. A lens barrel having a cam for stationary rotation. 5. The lens barrel according to claim 4, further comprising a lens moving end recognition unit. 6. The lens barrel according to claim 1, wherein the front lens barrel is provided on the front lens barrel so as to be movable in the optical axis direction. 7. An optical device comprising the lens barrel according to claim 1. Description: