JPH09184960A - Frame fixing device - Google Patents

Abstract

(57) An object of the present invention is to provide a device for fixing a frame body provided in a lens barrel, which can reliably connect two frame bodies without causing distortion or the like in the frame body. SOLUTION: The fixed frame 11 has a small hole 11 directed in the radial direction.
g in the enlarged diameter portion 15a of the lens support frame 15
Taps facing 1 g are provided respectively, and a bush 17 made of an elastic material is inserted into the small hole 11 g to make a small screw 18
The lens support frame 15 is fixed to the fixed frame 11 by screwing the lens support frame 15 into the tap through the bush 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to one of a plurality of frame bodies provided in a lens barrel which is used for optical equipment such as a camera for photographing, a small-sized photographing machine, a video camera, a copying machine, and an enlarger. The present invention relates to a fixing device for fixing two frames that are mechanically connected to each other.

[0002]

2. Description of the Related Art A zoom lens barrel includes a cam barrel having a long and narrow cam hole along its circumference, a fixed barrel for rotatably supporting the cam barrel, and a cam follower (pin-shaped) projecting into the cam hole. Roller) and a movable barrel which is housed in the cam barrel or the fixed barrel to support a variable power lens,
By rotationally driving the cam barrel, the movable barrel is moved in the optical axis direction to perform optical scaling.

In practice, a plurality of moving barrels supporting the respective magnification-varying lenses are internally provided in a cam barrel or a fixed barrel, and each of these moving barrels moves in conjunction with the cam barrels for varying the magnification. There are many configurations that change the position of the lens.

[0004]

The zoom lens barrel described above has a frame body structure such as a cam barrel, a fixed barrel, a movable barrel, and a lens support frame. However, due to the shape and structure of the frame body. Two
It is necessary to connect the two frame bodies as one integrated frame body. For example, the fixed cylinder and the lens support frame or the movable cylinder and the lens support frame are integrally connected.

In the case of connecting the two frame bodies in this way, conventionally, they are often fixed simply by screwing. Therefore, a tensile force or a pressure contact force due to the screwing may act, and the frame body may be distorted. . Since such distortion of the frame reduces the roundness of the frame, it causes the smooth rotation of the cam barrel and the movement of the movable barrel, and also deteriorates the resolution of the lens. Also becomes.

In view of the above situation, the present invention provides a frame body fixing device for a lens barrel which can surely fix these two frame bodies without causing distortion or the like in the two frame bodies to be connected. The purpose is to propose.

[0007]

In order to achieve the above object, in the present invention, in a fixing device for a frame body provided in a lens barrel, one of the two frame bodies is oriented in the radial direction. Mounting holes are provided in the other frame, and screw holes facing the mounting holes are provided in the other frame, and a bush of elastic material is inserted into the mounting holes, and a screw is screwed through the bush into the screw hole. A frame fixing device, characterized in that the frame and the other frame are fixed to each other, is proposed.

[0008]

In the fixing means constructed as described above, when the screw is screwed, the bush bulges in the radial direction of the mounting hole and strongly presses against the hole wall of the mounting hole. As a result, the one frame body and the other frame body are securely fixed to each other via the bush and the screw, and the two frame bodies fixed in this way are hardly distorted, and the operation of the lens barrel and the Does not affect the resolution of the lens.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a first embodiment of the present invention will be described with reference to FIGS. 1 is a side view of a zoom lens barrel for a camera, FIG. 2 is an enlarged vertical side view of the zoom lens barrel, and FIG. 3 is an enlarged cross-sectional plan view of the zoom lens barrel.

In these drawings, 11 is a cylindrical fixed frame mounted on the camera body, 12 is a cylindrical cam frame rotatably provided around the fixed frame 11, and 13 is the fixed frame 1.
Reference numeral 14 denotes a first moving frame that moves in the inside 1, and reference numeral 14 denotes a second moving frame in which a sliding contact portion provided in the periphery is fitted into a cutout hole of the first moving frame 13.

L ₁ is a fixed lens group supported by the fixed frame 11, L ₂ and L ₃ are movable lens groups supported by the front and rear ends of the first moving frame 13, and L ₄ is a second moving group. A moving lens group supported on the frame 14, L ₂ functions as a focusing lens, and L ₁ , L ₃ , and L ₄ function as zooming lenses, respectively, and in particular, L ₄ functions as a correcting lens. .

As shown in FIG. 2, the fixed frame 11 has guide holes 11a and 11b extending upward and downward along the optical axis direction (cylindrical axis direction) and elongated linearly, and as shown in FIG. In addition, the guide holes 11c and 11d that are elongated and linearly extended are provided on the left side and the right side.

The guide holes 11a and 11b guide the second moving frame 14, and the guide holes 11c and 11d guide the first moving frame 13. The former guide hole 11c is larger than the latter guide holes 11c and 11b. , 11d are formed slightly longer toward the rear of the lens barrel. A lens support frame 15 is fixed to the front end (the left end in the drawing) of the fixed frame 11 by a small screw screwed with a bush interposed.

As shown in FIG. 4, the lens supporting frame 15 is a disk-shaped member having arcuate expanded portions 15a and 15b on the upper and lower sides, and is fixed coaxially to the fixed frame 11. The lens holder 16 of the fixed lens unit L ₁ is screwed to the center of the lens holder. FIG. 4 shows A-
It is the reduced sectional view cut | disconnected along the A line.

The lens support frame 15 has an enlarged diameter portion 15.
The a and 15b are fitted into the cut grooves 11e and 11f provided in the upper and lower regions of the inner peripheral surface of the front end portion of the fixed frame 11 in an arc shape, and are fixed as shown in FIG.

FIG. 5 shows a mounting portion of the expanded diameter portion 15a, and the small hole 1 provided in the fixed frame 11 is provided in the expanded diameter portion 15a.
A bush 17 made of an elastic material such as rubber having a large friction coefficient is inserted through the small hole 11g, and a small screw 18 is screwed from the upper surface of the bush 17 toward the enlarged diameter portion 15a while forming a tap communicating with 1g. Is.

In this fixing means, the bush 17 swells in the lateral direction (the circumferential direction of the screw shaft) by screwing in the machine screw 18 and strongly presses against the hole wall of the small hole 11g, and the bush 17 and the machine screw 18 are used. The expanded diameter portion 15a can be firmly fixed to the fixed frame 11, and the fixing means hardly gives strain to the fixed frame 11. The attachment of the expanded diameter portion 15b is similar to the above.

The bush 17 is fixed to the fixed frame 11.
It is preferable to make it slightly larger than the small hole 11g,
Further, the fixing means described above is effective not only in the zoom lens barrel of this embodiment but also in other devices and equipment.

The cam frame 12 has a pair of cam holes 12a and 12b for pushing the first moving frame 13 (for 12a, see FIG. 3).
And a pair of cam holes 12c, 1
2d (see FIG. 2 for 12d). The cam holes 12a and 12b are formed slightly longer toward the rear of the lens barrel than the cam holes 12c and 12d.

The cam frame 12 has a gear portion 1 at a rear portion.
2e is integrally formed, and this gear portion 12e meshes with a zooming pinion 19 attached to a flange 11h of the fixed frame 11. The cam frame 12 has a slot 12f formed in parallel with the gear 12e, and a stopper 20 fixed to the fixed frame 11 and positioned inside the slot 12f.
The rotation range is defined by and, and it is prevented from slipping out.

As shown in FIGS. 7 to 9, the first moving frame 13 is a bottomed cylindrical body having cutouts 13a and 13b in the upper and lower portions thereof, and the moving lens group L is located at the center of the bottom. _{The third} lens holder -21 is screwed, and a slightly enlarged flange 13c is integrally provided at the tip as a bridging portion.

The notch holes 13a, 13b are formed along the cylinder axis between a position slightly inward of the rear end (right end in the figure) and the tip (left end in the figure), and the tip thereof is the flange 13c. Of the cutout holes 13a and 13b, and the widths (lengths in the cylinder circumferential direction) of the cutout holes 13a and 13b are the expanded diameter portions 15a and 15b provided on the lens support frame 15.
And the arcuate width of the expanded circular curved surface portion provided on the second moving frame 14 described below.

Further, pin-roller-shaped cam followers 22a and 22b are projected toward the rear side of the first moving frame 13, and a female helicoid screw 13d is formed on the circumference of the tip end portion thereof. .

The first moving frame 13 having the above structure is shown in FIGS.
As you can see, the cam follower 2 is installed inside the fixed frame 11.
2a to the guide hole 11c of the fixed frame 11 and the cam hole 12a of the cam frame 12, and the cam follower 22b to the guide holes 11d.
And the cam holes 12d, respectively.
The moving lens group L is attached to the helicoid screw 13d of the moving frame 13.
A rotation cylinder 24, in which the _second lens holder 23 is screwed, is screwed.

A focusing pinion 25 is attached to the rotating cylinder 24.
A gear 24a meshed with is integrally formed, and the rotation of the gear 24a changes the position of the moving lens unit L ₂ . The rotating cylinder 24 is a flange 13c of the first moving frame 13.
The rotation range is determined by the protruding piece 24b that projects into the stepped portion 13e provided on the.

It is preferable that the projecting piece 24b be separately attached to the rotary cylinder 24 so that the position of the projecting piece 24b in the rotary cylinder 24 can be adjusted to some extent in the rotational direction. The focusing pinion 25, which is long in the optical axis direction, is attached to the flange 11h of the fixed frame 11.

The second moving frame 14 is shown in FIGS.
As shown in FIG. 3, the circular plate-shaped member having an arc-shaped expanded portion formed in the upper and lower portions and a central hole, and circularly curved surface portions 14a and 14b as sliding contact portions are integrally formed in the expanded portion. The pin curved roller followers 26a and 26b are provided on the circular curved surface portions 14a and 14b.

A circular lens support frame 27 is screwed to the plate surface of the second moving frame 14 on the side of the circular curved surface, and the lens holder of the moving lens unit L ₄ is attached to the center of the supporting frame 27.
28 is fixed.

As can be seen from FIGS. 2, 3 and 6, the second moving frame 14 having the above-described structure has the circular curved surface portions 14a and 14b as the first moving frames.
While fitting into the notch holes 13a and 13b of the moving frame 13,
The cam follower 26a is inserted into the guide hole 11a of the fixed frame 11 and the cam hole 12c of the cam frame 12 so that the cam follower 26a
b is inserted into these guide hole 11b and cam hole 12d. FIG. 6 shows B in FIG.
It is the reduced sectional view cut | disconnected along the -B line.

Further, in this embodiment, a slight space is formed between the second moving frame 14 and the lens supporting frame 27, and shutter blades are incorporated in this space. The shutter drive device 29 is attached to the lens support frame 27 so as to be positioned inside the circular curved surface portions 14a and 14b, as shown by a phantom line in the figure.

13 to 16 show an embodiment of the shutter blade and the shutter driving device 29 described above. As can be seen from FIGS. 13 and 14 showing the front surface (left side surface in FIGS. 2 and 3) of the lens support frame 27, the shutter blade 30a is shown.
Is supported by a support shaft of a main gear 31 provided on the back side of the lens support frame 27, and a support of an auxiliary gear 32 provided on the back side of the lens support frame 27 so that the shutter blades 30 b are interlocked with the main gear 31. It is supported by a shaft.

Therefore, when the main gear 31 rotates clockwise,
When the shutter blades 30a and 30b are opened as shown in FIG. 13 and are rotated left, as shown in FIG.
30b closes. The main gear 31 is rotationally driven by the shutter drive device 29 shown in FIG. Note that FIG.
Indicates the back surface of the lens support frame 27.

The shutter drive device 29 is constituted by an electromagnetic drive mechanism, and includes a pendulum lever 33 made of a magnetic material and attached to the spindle of the main gear 31, and two electromagnets 34, 3.
It consists of five. As shown in FIG. 16, the electromagnet 34 is composed of a U-shaped core 36 and a coil 37, and the electromagnet 35 is similarly composed of a U-shaped core 38 and a coil 39. It is fixedly attached to the lens supporting frame 27 which is opposed.

The pendulum lever 33 is substantially T-shaped, its foot portion is pivotally attached to the spindle of the main gear 31, and its head is swung between the end portions of the electromagnet 34 and the core of the electromagnet 35. It is located freely. The gears 40, 41 and the flywheel 42 are governors, and the shutter blades 30a, 30
b to stabilize the operation.

In the shutter mechanism described above, the pendulum lever 33 is rotated counterclockwise as shown by supplying electric power to the electromagnet 34.
When the main gear 31 and the sub gear 32 driven thereby open the shutter blades 30a and 30b and the electromagnet 35 is supplied with electric power, the pendulum lever 33 rotates right to the symmetrical position shown in the drawing, and the reverse operation is performed. The shutter blades 30a and 30b are closed.

FIG. 17 is a time chart showing the shutter operation of the above-mentioned shutter blades. If the power supply time of the electromagnets 34, 35 is set appropriately, the shutter blades 30a, 30a
Before b is fully opened, the closing operation is started, and as shown by the alternate long and short dash line in the figure, the program shutter uses the shutter blades 30a and 30b as apertures. Note that in FIG.
₁ the shutter blades 30a, 30b start of the operation of, S ₂ starts opening of the shutter, S ₃ respectively indicate the position of full opening of the shutter.

The above-described electromagnetic drive mechanism includes a pendulum lever 33
If the heads of the shutter blades are made of permanent magnets or the electromagnets 34 and 35 are fed with a reverse current when the shutter is opened and closed, the operation of the shutter blades 30a and 30b becomes sensitive, which is advantageous. is there.

In the shutter mechanism, if the pendulum lever 33 is controlled through a quick return mirror of a single-lens reflex camera and a series of sequence mechanisms,
It can be used as a lens shutter for this type of camera. The shutter drive device described above is not limited to the one described above, and can be replaced with another known shutter drive device.

Next, the operation of the zoom lens barrel of the first embodiment will be described. When the switch is turned on for scanning the zoom lens, the pinion 1 is generated by the rotation of the motor.
9 is driven.

If it is assumed that the first and second moving frames 13 and 14 are in the telephoto state as shown in FIGS.
The cam frame 12 is rotated in association with the rotation of the pinion 19, so that the cam followers 22a and 22b are connected to the cam holes 12a and
The first moving frame 13 is moved to the right in the figure by being pushed by 12b, and the cam followers 26a and 26b are also pushed by the cam holes 12c and 12d, so that the second moving frame 1 is moved.
4 moves rightward in the figure.

In the above moving process, the cam follower 22
a and 22b are guided by the guide holes 11c and 11d of the fixed frame 11, the first moving frame 13 moves in the fixed frame 11 without rotating, and the rotation of the first moving frame 13 is screwed into the tip of the moving frame 13. Tube 2
The fourth gear portion 24a moves to the right while meshing with the focusing pinion 25.

The second moving frame 14 includes a cam follower 26a,
26b is guided by the guide holes 11a and 11b of the fixed frame 11 and moves in a non-rotating state, and the circular curved surface portions 14a and 14b thereof are moved.
b moves in the notch holes 13a and 13b of the first moving frame 13.

When the rotation of the cam frame 12 progresses and reaches a predetermined rotation position, the end edge of the elongated hole 12f hits the stopper 20 and the rotation of the cam frame 12 is stopped. As a result, the motor that drives the pinion 19 becomes overloaded, and the switch that detects this overload shuts off the power supply to the motor.

FIG. 12 shows a state in which the telephoto position is changed to the wide-angle position by the above zooming. As can be seen from this figure, the moving lens groups L ₂ and L ₃ are displaced together by the movement of the first moving frame 13 and have the same moving distance, but are displaced by the movement of the second moving frame 14. The lens unit L ₄ is independently displaced, and the moving lens units L ₂ and L ₃ are moved.
The moving distance becomes smaller than that of.

The movement of the moving lens unit L ₄ can be arbitrarily determined by changing the cam holes 12c and 12d of the cam frame 12, but in reality, the movement range is determined by a functional condition, so that the movement of the cam frame is determined. Twelve cam holes 12c and 12d are formed.

On the other hand, the focusing pinion 25 is driven by a motor included in the automatic distance-measuring mechanism, and the rotating barrel 24 is rotated according to the helicoid screw. The rotation of the rotating cylinder 24 displaces only the position of the moving lens unit L ₂ in the optical axis direction to control focusing.

When shifting to the telephoto position, the pinion 19 is rotationally driven in the opposite direction to the above. From this, the first
The moving frame 13 and the second moving frame 14 are in reverse operation as compared with the above, and are in the operation state shown in FIGS.

Although the first embodiment of the present invention has been described above, the number of cam followers provided in the first moving frame 13 and the second moving frame 14 and the corresponding cam holes of the cam frame 12 are arbitrary. Can be increased or decreased to the 1st
The number of notch holes in the moving frame 13 may be increased or decreased as necessary. In this case, the enlarged diameter portion of the lens support frame 15 and the circular curved surface portion of the second moving frame 14 are formed so as to correspond to the cutout holes.

In the first embodiment, only the second moving frame 14 is fitted in the notch holes 13a and 13b of the first moving frame 13, but another moving frame is fitted together with the second moving frame 14 in the cam. It may be configured to move by the frame 12, or the cam frame 12 may be provided inside and the fixed frame 11 may be provided outside.

Further, according to the first embodiment, the second
Although a narrow space is formed between the plate surface of the movable frame 14 and the lens support frame 27, and the shutter blades 30a and 30b are provided in this space, the lens support frame 27 has circular curved surface portions 14a and 14b.
The shutter blade cover may be fixed to the front side of the lens support frame 27 so as to provide a narrow space, and the shutter blades 30a and 30b may be provided in this space.

Next, a second embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIGS. 18 is a vertical sectional side view of the zoom lens barrel according to the second embodiment, FIG. 19 is a cross-sectional plan view of the zoom lens barrel, and FIG. 20 is an exploded perspective view of the zoom lens barrel.

In these drawings, 51 is a cylindrical fixed frame attached to the camera body, 52 is a first moving frame that moves on the outer surface of the fixed frame 51, and 53 is a second moving frame that moves within the fixed frame 51. , 54 are cylindrical cam frames provided rotatably around the first moving frame 52. Further, each of L _{1 to} L ₄ is a lens group similar to the first embodiment.

The fixed frame 51 has a guide groove 5 extending linearly in the upper and lower directions along the optical axis direction (cylindrical axis direction).
1a and 51b, and left and right sides thereof are provided with wide cutout holes 51c and 51d (see FIGS. 2 and 3) which are open at the rear end side and extend in the cylinder axis direction.

The guide grooves 51a and 51b guide the first moving frame 52 so as not to rotate in the optical axis direction, and the notch holes 51c and 51d.
Is a notch hole that allows the second moving frame 53 and the lens support frame 55 to move in the cylinder axis direction.

A lens support portion 51e in the form of a partition is integrally provided at the front end of the fixed frame 51, and the lens holder 56 of the fixed lens unit L ₁ is screwed to the support portion 51e. I am doing it. Note that on the lens supporting portion 51e is provided with a arc-shaped through hole 51f, but the second stopper moving frame 53 to be described later for determining the rotation range of the movable lens L ₂ for focusing on this - Rod 53c, 53d
Is inserted. This will be described later.

On the other hand, at the rear end of the fixed frame 51, FIG.
2 and FIG. 23, the notches 51c, 51
The arc-shaped concave portion 5 is formed between the mounting plate portion 51g and the mounting plate portion 51g which forms the bridging portion.
1h and 51i are provided symmetrically, and further, the stopper-convex portion 51 is provided on the outer wall of each of the concave portions 51h and 51i.
j, 51k are also connected to the outer wall by the locking claws 51.
p and 51m are provided at symmetrical positions.

The locking claws 51p and 51m are for attaching a cam frame, which will be described later, as a bayonet structure, and the stopper-convex portions 51j and 51k are for defining the turning range of the cam barrel. Note that FIG. 22 is a cross-sectional view taken along the line CC of FIG. 18 in which the first moving frame 52 and the cam frame 54 are omitted, and FIG.
5 is a partial perspective view of the fixing frame 51. FIG.

The above-described first moving frame 52 has cam followers 57a and 57b above and below, and guide holes 52a and 5a extending left and right in the optical axis direction in a linear shape.
2b (see FIG. 2).

The cam followers 57a and 57b are pin-shaped rollers, and a key color 5 is provided inside these moving frames.
8a and 58b are fixed.
a and 58b slide in the guide grooves 51a and 51b of the fixed frame 51. The guide holes 52a and 52b described above guide the cam followers of the second moving frame 53, which will be described later.

Further, a turning barrel 59 screwed with a helicoid screw is provided at the tip of the first moving frame 52, and the lens barrel 60 of the moving lens unit L ₂ is attached to the turning barrel 59.
Is screwed.

A gear 59a meshed with the focusing pinion 61 is integrally formed on the rotating cylinder 59, and the position of the moving lens unit L ₂ is changed by this rotation. The rotating cylinder 59 is fixed to the fixed frame 51 by the lens holder 60.
The turning limit is set by the turning rod 62 protruding toward the inside.

The focusing pinion 61 has a support arm 63 fixed to the first moving frame 52 through a cam hole of the cam frame 54.
It is provided in the first moving frame 52 and moves integrally with the first moving frame 52. The lens supporting frame 55 is screwed to the rear end of the first moving frame 52, and the lens holder-64 of the moving lens unit L ₃ is screwed to the supporting frame 55.

As shown in FIGS. 20 and 24, the lens support frame 55 is a disk-shaped member having circular arc-shaped enlarged diameter portions 55a and 55b, and these enlarged diameter portions 55a and 55b are fixed to the fixed frame 51. It is loosely inserted into the notch holes 51c and 51d and fitted to the inner peripheral surface of the first moving frame 52, and a small screw 65 (see FIG. 19) screwed into the small hole 52c provided in the first moving frame 52 is used to insert the bush. Fixed. 24 is a cross-sectional view taken along the line CC of FIG.

As can be seen from the perspective view of FIG. 20, the second moving frame 53 is a disk-shaped member having a circular arc-shaped expanded portion and a central hole formed on the left and right, and each expanded portion has a circular shape. Curved surface portion 53
a and 53b are integrally formed, and these circular curved surface portions 53a and 53b are formed.
b, cam followers 66a and 66 which are pin-shaped rollers.
b is provided.

A circular lens support frame 67 is screwed to the plate surface of the second moving frame 53 on the side of the circular curved surface, and the lens holder of the moving lens unit L ₄ is attached to the center of the supporting frame 67.
A part 68 is provided.

As can be seen from FIGS. 18 and 19, the second moving frame 53 having the above-described structure allows the circular curved surface portions 53a and 53b to be loosely inserted into the cutout holes 51c and 51d of the fixed frame 51, and the cam followers 66a and 66b to be the first. Guide hole 52 of moving frame 52
It is fitted in a and 52b and slidably passed through to abut the cam surface of the cam barrel 54.

On the other hand, as shown in the perspective view of FIG. 20, the second moving frame 53 is provided with two stopper rods 53c and 53d extending in parallel with the optical axis direction. These stopper rods 53c and 53d are the lens support portion 51 of the fixed frame 51.
Tsuranuke through an arcuate through hole 51f provided in the e, projecting the pivot area of the pivot rod 62 to define the rotation range of the moving lens group L _2, so this pivot rod 62 abuts when pivoted in a predetermined range ing.

A coil spring 70 for expanding pressure is provided between the lens support frame 67 fixed to the second moving frame 53 and the lens support frame 55 fixed to the first moving frame 52, and the second moving frame 53 is provided. 18 and 19 in the left direction, the first moving frame 5
A spring force that constantly pushes 2 in the right direction in the figure is given.

In this embodiment, a slight space is formed between the second moving frame 53 and the lens support frame 67, and shutter blades (not shown) are incorporated in this space.

The shutter driving device is attached to the lens support frame 67 so as to be positioned inside the circular curved surface portions 53a and 53b as shown by a phantom line 69 in the figure. Specifically, FIGS. It is similar to that of the first embodiment shown.

As can be seen from the perspective view of FIG. 20, the above-mentioned cam frame 54 has one side cam holes 71, 72 provided on the front side.
And a cylindrical body having the other side cam holes 73 and 74 provided on the rear side so that the substantially triangular plate-shaped portions 54a and 54b covering the one side cam holes 71 and 72 swell from the surroundings. And the cam surface parallel walls 54a ₁ , 54a ₁ , 54b parallel to the cam surfaces 71a, 72a,
54b ₁ is formed.

FIG. 21 is a development view of the cam frame 54.
As shown in this drawing, the one-side cam holes 71, 72 are notched holes formed by cutting in the axial direction from the upper and lower portions of one end of the cylindrical body, and the linear inclined slope side is the cam surface 71.
a, 72a, and the other-side cam holes 73, 74 are notched holes formed by cutting from the left and right portions of the other end of the tubular body in the tubular axial direction, and their curved inclined sides form the cam surfaces 73a, 74a. doing.

In the cam frame 54, plate portions 54a and 54b which cover the one side cam holes 71 and 72 are integrally formed on the outer periphery of the cam frame 54, and the other side cam hole 73 is formed. , 74, flange portions 54c, 54d are integrally formed on the outer circumference of the rear end of the cam frame 54.

The plate portions 54a and 54b described above have a substantially triangular shape, and the hypotenuse portions thereof form cam surface parallel walls 54a ₁ and 54b ₁ which are parallel to the cam surfaces 71a and 72a.

The cam surface parallel walls 54a ₁ and 54b ₁ are shown in FIG.
As shown in FIG. 5, the heads of the cam followers 57a and 57b are in contact with each other by expanding the diameter in the cylinder circumferential direction as compared with the cam surfaces 71a and 72a.

A small gap is provided between the cam surface parallel wall 54a ₁ and the cam follower 57a and between the cam surface parallel wall 54b ₁ and the cam follower 57b. Normally, the cam followers 57a and 57b are provided with these cam surface parallel walls. 54
Avoid contact with a ₁ and 54b ₁ .

For example, the distance between the cam surface parallel wall and the cam follower is set to 0 to 0.2 mm as indicated by ΔX in FIG. Also, the distance between the cam surface parallel wall and the cam follower △ X
As shown in FIG. 26, the head diameter of the set screw of the cam follower may be appropriately set and adjusted. In this way, ΔX can be brought close to “0” as much as possible over the entire length of the cam surface parallel wall, which is advantageous.

On the other hand, the cam frame 54 is provided with a gear portion 54e on the periphery slightly inward from the rear end thereof, and a zooming pinion 75 is meshed as shown in FIG. The zooming pinion 75 is supported by the mounting plate portion 51g of the fixed frame 51.

The cam frame 54 has flange portions 54c, 54.
d is fitted to the arcuate concave portions 51h and 51i so as to be locked to the locking claws 51p and 51m of the fixed frame 51, and as described above, it is attached to the fixed frame 51 in the bayonet form. 54f integrally provided around the rear of the
The position of the cam frame 54 in the cylinder axis direction is determined such that 54g is joined to the surfaces of the locking claws 51p and 51m.

As shown by a phantom line in FIG. 21, the cam followers 57a and 57b of the first moving frame 52 are in contact with the cam surfaces 71a and 72a of the one side cam holes 71 and 72, respectively, and the other side cam holes The cam surfaces 73a, 74a of the holes 73, 74 are assembled so that the cam followers 66a, 66b of the second moving frame 53 are in contact with each other. The circular temporary line shown together with the cam follower 57a in the one side cam hole 71 is the support arm of the focusing pinion 61 as described above.

In assembling the zoom lens barrel described above, the second moving frame 53 and the lens supporting frame 55 are housed in the fixed frame 51 with the coil spring 70 interposed therebetween, and then the first moving frame 52 is fixed. Fit on the outer periphery of the frame 51,
The lens support frame 55 is fixed to the first moving frame 52 with machine screws 65.

Next, the cam frame 54 is fitted to the outer periphery of the first moving frame 52. In this case, as shown by the chain double-dashed line in FIG.
The rear end of the cam frame 54 is formed into an arcuate concave portion of the fixed frame 51 so that the flange portion 54d fits the stopper projection 51j and the locking claw 51m between the k and the locking claw 51p. 51
Then, the cam frame 54 is rotated to the left.

With this operation, the flange portion 54c is moved to the locking claw 51.
The flange portion 54d enters under the locking claw 51m on the lower side of p, and the respective flange portions 54c and 54d are locked.

After locking in this manner, the stopper pieces 76 are brought close to the stopper protrusions 51j and 51k.
The a and 76b are fixed to prevent the flanges 54c and 54d from coming off. The stopper pieces 67a, 67b
Is fixed to the outer wall surfaces of the arcuate concave portions 51h and 51k with a screw or an adhesive.

As can be seen from FIG. 24, in the cam frame 54 attached as described above, the flange portion 54c is between the stopper-projection portion 51j and the stopper piece 76a, and the flange portion 54d is between the stopper-projection portion 51k and the stopper-projection portion 51k. The rotation range is defined by the rotation with the piece 76b.

The cam followers 57a, 57b and 66a,
66b is assembled so that the cam frame 54 is attached and then fixed to each of the first moving frame 52 and the second moving frame 53, and the rotating cylinder 59 is screwed into the first moving frame 52.

Next, the operation of the zoom lens barrel of the second embodiment will be described. Assuming that the first moving frame 52 is pushed back and is in the wide-angle state shown in FIGS. 18 and 19, each of the cam followers 57a, 57b, 66a, and 6a.
6b has a contact relationship with the cam frame 54 as shown in FIG.

When the switch is turned on for zoom operation,
The zooming pinion 75 is driven by the rotation of the motor. As a result, the cam frame 54 that is interlocked with the pinion 75 turns right when viewed from the front (left side in FIG. 18), and the cam followers 57a and 57b move from the one side cam hole 7 to this side.
The first moving frame 52 is pushed by the cam surfaces 71a and 72a of the first and second 72, and moves in the leftward direction in FIGS. 18 and 19 against the pressure expanding action of the coil spring 70.

The cam followers 66a and 66b receive the pushing force of the coil spring 70, and the cam holes 73 and 74 on the other side.
As the cam surfaces 73a and 74a of the No. 2 move, they move in the optical axis direction, and as a result, the second moving frame 53 moves to the left in FIGS. 18 and 19.

In the above moving process, the cam follower 57
Keys 58a, 5a and 5b which are integrated with
8b is guided by the guide grooves 51a and 51b of the fixed frame 51,
The first moving frame 52 moves between the fixed frame 51 and the cam frame 54 without rotating, and the gear 59a of the rotating cylinder 59 screwed to the tip of the first moving frame 52 is for focusing. It moves to the left while being in mesh with the pinion 61.

The second moving frame 53 includes a cam follower 66a,
66b is guided by the guide holes 52a and 52b of the first moving frame 52, and slides leftward in the fixed frame 51 without rotating, and the circular curved surface portions 53a and 53b have the cutout holes 51 of the fixed frame 51.
c, move inside 51d.

With the rotation of the cam frame 54, the flange portions 54c and 54d turn to the right in FIG. 24, and when the cam frame 54 reaches a predetermined rotation position, these flange portions 54c and 5d.
The end of 4d hits the stopper pieces 76a and 76b, and the rotation of the cam frame 54 is stopped. As a result, the motor that drives the zooming pinion 75 becomes overloaded, and the switch that detects this overload shuts off the power supply to the motor.

FIG. 27 shows a state in which the zoom lens is moved from the wide-angle position to the telephoto position by the above zooming. As can be seen from this figure, the moving lens units L ₂ and L ₃ are displaced together by the movement of the first moving frame 52, and the moving distances thereof are the same, but the moving lens groups L ₂ and L ₃ are displaced by the movement of the second moving frame 53. The lens group L ₄ is independently displaced, and the moving lens groups L ₂ and L
_The movement distance is smaller than that of ₃ .

The movement of the moving lens unit L ₄ can be arbitrarily determined by changing the shapes of the cam surfaces 73a, 74a of the other side cam holes 73, 74 provided in the cam frame 54, but in practice, it is functionally The cam surfaces 73a and 74a are formed so that the moving distance is determined under various conditions.

On the other hand, the focusing pinion 61 is driven by a motor included in the automatic distance measuring mechanism, and the rotating barrel 59 is rotated according to the helicoid screw. The turning of the turning barrel 59 displaces only the position of the moving lens unit L ₂ in the optical axis direction to control focusing.

When the turning barrel 59 reaches a predetermined turning position, the turning rod 62 hits either one of the stopper rods 53c and 53d, and the turning of the turning barrel 59 is stopped. As a result, the motor that drives the focusing pinion 61 becomes overloaded, and the switch that detects this overload stops the motor or reversely controls this motor.

When shifting from the telephoto position to the wide-angle position, the zooming pinion 75 is rotationally driven in the opposite direction to the above. By this rotation, the cam followers 57a,
57b receives the expanding force of the coil spring 70 and follows the cam surfaces 71a and 72a of the one-side cam holes 71 and 72, respectively.
The cam followers 66a, 66
b is pushed by the cam surfaces 73a, 74a of the other side cam holes 73, 74 and moves in the same direction, and the first moving frame 52 and the second moving frame 53 are in the operating state shown in FIGS. 18 and 19.

Although the second embodiment according to the present invention has been described above, the cam holes 71, 72 on the one side and the cam hole 7 on the other side are described.
The number of 3, 74, etc. can be arbitrarily increased or decreased, and the plate portion 54a bridging the cam holes 71 to 74,
54b and the flange portions 54c and 54d are advantageous in ensuring the roundness of the cam frame 54, so that the plate portions 54a and 54b covering the one side cam holes 71 and 72 are continuously formed. It may be provided all around the cylinder.

The number of the cutout holes of the fixed frame 51 may be increased or decreased as necessary. In this case, the enlarged diameter portion of the lens support frame 55 and the circular curved surface portion of the second moving frame 53 are the cutout holes. Corresponding to. Further, the cutout holes 51c and 51d of the fixed frame 51 can be fitted with the second moving frame 53 and another moving frame similar to this.

In particular, the zoom lens barrel described above is advantageous because it can be formed by die cutting. For example, it is a zoom lens barrel which is easy to incorporate at low cost by stamping each part out of a material such as a synthetic resin material.

Further, the zoom lens barrel according to the present invention comprises:
It is suitable for a zoom lens barrel that displaces a linearly moving optical system and a non-linearly moving optical system.
A zoom lens barrel, which has been widely known from the past, having a configuration in which a lens and a focusing lens are fixed and a variable power lens and a correction lens are moved between these lenses can be easily implemented. it can.

The present invention is not limited to a camera for photographing,
It can be used as a zoom lens barrel for a compact camera or a video camera. Note that the zoom of the above embodiment is
When the lens barrel is used for a video camera, a diaphragm blade may be provided in the space between the second moving frame and the lens support frame instead of the shutter blade.

Further, the present invention does not have an automatic zooming control mechanism linked to the pinion 19 or 75 and an automatic focusing control mechanism linked to the pinion 25 or 61.
It may be implemented as a zoom lens barrel in which the cam frame and the rotary cylinder 24 or 59 are manually operated.

[0104]

As described above, in the fixing device according to the present invention, one frame is provided with a mounting hole and the other frame is provided with a screw hole, and an elastic material bush is inserted into the mounting hole. Since the screw passed through the bush is screwed into the screw hole, the two frame bodies can be securely fixed to each other without causing distortion in the frame body. As a result, the fixing device is extremely advantageous as a frame connecting means for the lens barrel.

[Brief description of the drawings]

FIG. 1 is a side view of a zoom lens barrel showing a first embodiment of the present invention.

FIG. 2 is an enlarged vertical side view of the zoom lens barrel.

FIG. 3 is an enlarged transverse plan view of the zoom lens barrel.

FIG. 4 is a reduced sectional view taken along line AA in FIG. 2;

FIG. 5 is a partially enlarged view showing a mounting portion of a lens support frame.

FIG. 6 is a reduced sectional view taken along line BB in FIG. 2;

FIG. 7 is a front view of a first moving frame.

FIG. 8 is a side view of the moving frame.

FIG. 9 is a plan view of the moving frame.

FIG. 10 is a front view of a second moving frame.

FIG. 11 is a side view of the movable frame.

FIG. 12 is an enlarged vertical sectional side view similar to FIG. 2, showing a state of shifting to a wide-angle position.

FIG. 13 is a front view of a lens support frame to which shutter blades are attached, and is a diagram showing an opening state of a shutter.

FIG. 14 is a front view of a lens support frame to which shutter blades are attached, and is a view showing a closed state of a shutter.

FIG. 15 is a rear view of the lens support frame to which the shutter driving device is attached.

FIG. 16 is a plan view of an electromagnetic drive mechanism that constitutes the shutter drive device.

FIG. 17 is a time chart showing a shutter operation of the shutter mechanism.

FIG. 18 shows the second embodiment of the present invention, and is an enlarged vertical sectional side view of a zoom lens barrel.

FIG. 19 is an enlarged cross-sectional plan view of the zoom lens barrel.

FIG. 20 is an exploded perspective view of the zoom lens barrel.

FIG. 21 is a development view of a cam frame.

FIG. 22 is a view C of FIG. 18 in which the first moving frame and the cam frame are omitted.
It is a C-line reduced sectional view.

FIG. 23 is a partial perspective view of a fixed frame.

24 is a cross-sectional view taken along the line CC of FIG.

FIG. 25 is a partially enlarged view of FIG. 18 showing a cam follower portion enlarged.

FIG. 26 is an enlarged view similar to FIG. 25 showing a modified example.

FIG. 27 is an enlarged vertical cross-sectional side view of the zoom lens barrel, showing a state where a transition has been made from a wide-angle position to a telephoto position.

[Explanation of symbols]

 11, 51 Fixed frame 11g Small hole 12, 54 Cam frame 13, 52 First moving frame 14, 53 Second moving frame 13a, 13b, 51c, 51d Notched hole 14a, 14b, 53a, 53b Circular curved surface part 15 Lens support frame 17 bushing 18 machine screw 29 shutter drive device 52c small hole 65 machine screw

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Eiki Matsuo 2800 Nagachi, Okaya-shi, Nagano Kyocera Stock Association President Nookaya Plant (72) Inventor Hirotaka Castle 6-27, Jingumae, Shibuya-ku, Tokyo Kyocera (72) Inventor Fumio Niizawa, 6-27-8, Jingumae, Shibuya-ku, Tokyo Kyocera Co., Ltd.

Claims (1)

[Claims] 1. A frame body fixing device provided in a lens barrel, wherein one of the two frame bodies has a mounting hole directed in a radial direction, and the other frame body has a mounting hole facing the mounting hole. With each screw hole provided, a bush of elastic material is inserted into the mounting hole, and a screw is screwed through the bush into the screw hole to fix one frame body to the other frame body. Characterized frame fixing device.