JP2003021776A - Zoom lens frame and zoom camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a zoom lens frame which can be made compact and light in weight or a zoom camera equipped with the zoom lens frame. SOLUTION: This zoom lens frame 100 is a zoom lens frame constituted of five stages, and has a straight advance frame 103 as a cylinder member at the second stage and a rotating cylinder 104 as a cylinder member at the third stage. The frame 103 has a straight advance guiding plate part 116, and a male helicoid screw 114 is provided on the outer periphery of the plate part 116. A female helicoid screw 115 fit to the screw 114 is provided on the inner periphery of the cylinder 104. When the cylinder 104 is relatively rotated to the frame 103, it is extended while rotating by the helicoid screws. Since the screw 114 is provided on the plate part 116, the collapsible length of the lens frame 100 is shortened and the lens frame is made compact and light in weight.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a zoom lens frame and a structure of a zoom camera equipped with this zoom lens frame.

[0002]

2. Description of the Related Art In recent years, compact zoom cameras, which have become widespread, must cover the zoom range from wide-angle or collapsed photographing to telephoto photographing. Further, in recent years, there has been a demand for a higher zoom magnification, and as a result, the length (Lc) of the lens frame in the wide state or the collapsed state and the length (Lt) of the lens frame in the tele state. The difference (Lt-Lc) with the value of () becomes larger. In order to cope with this, as a lens frame structure that can be extended to a longer length, a multi-stage lens frame, that is, a multi-stage zoom lens frame is required.

Further, in the multi-stage zoom lens frame, the lens frame structure becomes more complicated and the weight of the entire zoom lens frame becomes heavy. On the other hand, however, compact zoom cameras are required to be further compact and lightweight.

Here, one conventional example of the conventional multi-stage zoom lens frame will be described with reference to FIGS. 11 to 13. FIG. 11 is a vertical cross-sectional view of the conventional zoom lens frame in the collapsed state, and FIG. 12 is a vertical cross-sectional view of the zoom lens frame in the zoom telephoto state. FIG. 13 is an exploded perspective view of the zoom lens frame. In the following description, the film surface 660 side will be referred to as the rear side, and the subject side (non-film surface side) will be referred to as the front side.

As shown in FIG. 13 and the like, the conventional zoom lens frame 600 has a five-stage structure consisting of two stages of a single ring frame and three stages of a double ring frame. Fixed tube 60
First and second stages of the first rotary cylinder 603 and the first straight advance frame 602 in the rotary cylinder, third stage of the second rotary cylinder 605 and the second straight advance frame 604 in the rotary cylinder, and the fourth stage Cam tube 607
And a third rectilinear frame 606 in the cam barrel, a first lens group barrel 608 in the fifth stage, and a second lens group frame 609 and a third lens group frame 61 housed in the cam barrel 607.
0 and a payout gear 611.

The first lens group cylinder 608, the second lens group frame 609, and the third lens group frame 610 each include a first lens group 651, a second lens group 652, and a third lens group, each of which includes a plurality of lens groups. The group 653 is held on the lens optical axis O of the main frame.

The fixed barrel 601 has a cylindrical shape and is fixedly supported by the camera body or the like. The fixed cylinder 601
A female helicoid screw (hereinafter referred to as a female helicoid) 614, a rectilinear groove 613, and a gear chamber 612 are provided on the inner circumference of the.

The feeding gear 611 is a long spur gear and is rotatably supported in a gear chamber 612 having an inner peripheral opening of the fixed barrel 601. The teeth of the fixed gear pass through the opening. It is exposed inside 601.

The first rotary cylinder 603 is a cylindrical cylindrical member and is arranged inside the fixed cylinder 601 so as to be rotatable and forward / backward. A female helicoid 62 is provided on the inner peripheral surface of the first rotary cylinder 603.
0 and a straight groove 621 are provided. First rotary cylinder 603
A male helicoid screw (hereinafter referred to as a male helicoid) 619 that is fitted (screwed) with a female helicoid 614 on the inner periphery of the fixed cylinder 601 is provided on the outer peripheral portion on the rear end side (the film surface 660 side). . The teeth of the spur gear are engraved so as to overlap the threads of the male helicoid 619. A feeding gear 611 arranged in a gear chamber 612 of the fixed cylinder 601 meshes with the spur gear portion.

The first rectilinear frame 602 includes a first rotary cylinder 60.
3 has an annular portion 616 at the rear end portion on the film surface 660 side, and extends from the annular portion 616 toward the front side (opposite film side) in parallel with the optical axis O. A plate-shaped portion 618 having a narrow arc-shaped projection is provided. The straight groove 6 on the inner peripheral surface of the fixed cylinder 601 is provided on the outer circumference of the annular portion 616.
Three protrusions 617 that are slidably fitted to 13 are provided.

The first rectilinear frame 602 and the first rotary cylinder 6
03 is a bayonet 615 formed on the annular portion 616 of the first rectilinear frame 602, and is slidably fitted into an inner peripheral groove (not shown) formed on the inner peripheral surface of the rear end side of the first rotary cylinder 603. It is connected in the state of being. Therefore, the first rotary cylinder 603 and the first rotary cylinder 603
The rectilinear frame 602 integrally advances and retreats in the optical axis O direction, and
It is held in a relatively rotatable engagement state to form a double ring.

The first rectilinear frame 602 and the first rotary cylinder 60
In the coupled state of No. 3, there is a gap between the inner peripheral surface of the first rotary cylinder 603 and the plate-shaped portion 618 so that another cylinder member can be inserted.

The second rotary cylinder 605 is a cylindrical member and is arranged inside the first rotary cylinder 603.
A cam groove 628 slidably fitted to the cam pin 641 of the third rectilinear frame 606 and a protrusion 634 provided on the outer peripheral surface of the cam barrel 607 are slidable on the inner peripheral face of the second rotary barrel 605. A straight groove 627 to be fitted is provided. Further, at the rear end portion of the outer peripheral surface of the second rotary cylinder 605, the three convex portions 6 slidably fitted with the rectilinear grooves 621 on the inner peripheral surface of the first rotary cylinder 603.
29 is provided.

The second rectilinear frame 604 is the second rotary cylinder 60.
5, and has an annular portion 624 on the rear end side. The optical axis O from the annular portion 624 toward the front side
Three plate-like portions 62 in the shape of arcs with a narrow width extending in parallel with
6 is provided so as to project.

A plate-shaped portion 618 of the first rectilinear frame 602 is provided on the optical axis O on the inner peripheral side of the annular portion 624 of the second rectilinear frame 604.
Three groove portions 625 are provided for guiding in the directions. Further, a male helicoid 622 screwed with a female helicoid 620 on the inner periphery of the first rotary cylinder 603 is provided on the outer periphery of the annular portion 624.

The second rectilinear frame 604 and the second rotary cylinder 605.
Means that the bayonet 623 formed in the annular portion 624 of the second rectilinear frame 604 is rotatably fitted in the inner peripheral groove 643 formed in the inner peripheral surface of the second rotary cylinder 605.
Therefore, the second rectilinear frame 604 and the second rotary cylinder 605 are provided.
And are coupled so as to be relatively rotatable and integrally movable in the optical axis O direction to form a double ring.

The second rectilinear frame 604 and the second rotary cylinder 60
In the coupled state of No. 5, there is a gap between the inner peripheral surface of the second rotary cylinder 605 and the plate-shaped portion 626, into which another cylinder member can be inserted.

The cam cylinder 607 is a cylindrical cylinder member and is arranged inside the second rotary cylinder 605. On the inner peripheral surface of the cam barrel 607, the cam pin 636 of the first lens group barrel 608 and the cam pin 637 of the second lens group frame 609.
And a zooming cam groove 635 which is slidably fitted to the cam pin 638 of the third lens group frame 610. However, in FIG. 13, only a part of the cam groove 635 is shown. Further, three convex portions 634 which are slidably fitted in the three rectilinear grooves 627 on the inner circumference of the second rotary cylinder 605 are provided at the rear end of the outer peripheral surface of the cam cylinder 607.

The third rectilinear frame 606 is arranged inside the cam cylinder 607 and has an annular portion 633 on the rear end side.
Three plate-shaped portions 631 each having an arcuate protrusion having a narrow width and extending from the annular portion 633 toward the front side in parallel to the optical axis O are provided. The plate-shaped portion 626 of the second rectilinear frame 604 is fitted to the inner peripheral surface of the projecting plate-shaped portion 631 so as to move back and forth 3
One groove portion 632 is provided. Further, the third straight frame 60
A cam pin 641 slidably fitted in a cam groove 628 on the inner circumference of the second rotary cylinder 605 is fixed to the outer circumference of the annular portion 633 of No. 6.

Then, the third rectilinear frame 606 and the cam barrel 6
Reference numeral 07 denotes a bayonet 630 formed on the annular portion 633 of the third rectilinear frame 606, and is coupled to an inner peripheral groove 644 formed on the inner peripheral surface of the cam barrel 607 so as to be relatively rotatable. Therefore, the third rectilinear frame 606 and the cam barrel 607 are provided.
Are integrally joined to each other in the direction of the optical axis O and are engaged in a relatively rotatable engagement state to form a double ring.

There is a gap between the inner peripheral surface of the cam barrel 607 and the plate-shaped portion 631 when the third rectilinear frame 606 and the cam barrel 607 are connected to each other so that another tubular member can be inserted therein.

An escape groove 645 is formed on the outer circumference of the annular portion 633 of the third rectilinear frame 606. The plate-shaped portion 618 of the first rectilinear frame 602 is provided in the groove portion 62 of the second rectilinear frame 604.
5, and the clearance groove 645 of the third rectilinear frame 606 is loosely fitted.

The first lens group barrel 608 is a cylindrical tubular member, and is arranged inside the cam barrel 607. A first lens group 651 including a plurality of lenses is fixed on the optical axis O in the first lens group cylinder 608. The plate-shaped portion 63 of the third rectilinear frame 606 is formed on the inner peripheral surface of the first lens group cylinder 608.
A groove portion 642 in which 1 is fitted and which guides straightly is provided.
The cam barrel 6 is provided at the rear end of the outer periphery of the first lens group barrel 608.
Cam groove 635 for positioning the first lens group on the inner peripheral surface of 07
A cam pin 636 for fitting with is fixedly installed.

Second and third lens group frames 609 and 610
Is arranged inside the cam barrel 607 and can be housed inside the fixed frame 601 together with the first lens group barrel 608 and the like in the lens barrel collapsed state. Second and third lens group frame 60
Reference numerals 9 and 610 hold a second lens group 652 and a third lens group 653 each made up of a plurality of lenses on the optical axis O, and on the outer peripheral surface thereof, a third rectilinear frame 606, respectively.
Groove portion 63 which is fitted in the plate-shaped portion 631 of and is guided straight
9,640 are provided.

Further, the second and third lens group frames 6 are provided.
The outer peripheral surfaces of the cams 609 and 610 have a second inner peripheral surface of the cam cylinder 607.
Further, cam pins 637 and 638 which are slidably fitted in the positioning cam grooves 635 of the third lens group are fixedly provided.

The conventional zoom lens frame 6 having the above-mentioned structure
Basically, the respective frame members in 00 have the following coupling relationships. That is, in one frame of the double ring configuration,
A straight groove and a female helicoid, or a cam groove is provided, and each of the straight groove, the female helicoid, and the cam groove is respectively against the convex portion of one frame of the next double ring configuration, the male helicoid, and the cam pin. Straight engagement, helicoid fit, or
The cam fits into the connected state.

The connection relationship between the frame members will be specifically described. First, the straight groove 61 on the inner circumference of the fixed barrel 601.
The convex portion 617 of the annular portion 616 of the first rectilinear frame 602 is fitted into the third portion 3. The narrow arc-shaped plate-shaped portion 618 of the first straight-moving frame 602 is fitted into the groove 625 on the inner circumference of the second straight-moving frame 604. The plate-shaped portion 626 of the second rectilinear frame 604 is fitted into the groove 632 on the inner periphery of the third rectilinear frame 606.

Further, with respect to the plate-like portion 631 of the third rectilinear frame 606, the groove portion 642 on the inner circumference of the first lens group cylinder 608 and the second portion
The groove 639 on the outer periphery of the lens group frame 609 and the groove 640 of the third lens group frame 610 are linearly engaged with each other.

Therefore, with reference to the fixed cylinder 601, the first rectilinear frame 602, the second rectilinear frame 604, and the third rectilinear frame 60.
6, the first lens group cylinder 608, the second lens group frame 609, and the third lens group frame 610 are supported so as to be able to move straight forward and backward.

Further, the rectilinear groove 6 on the inner circumference of the first rotary cylinder 603.
21, the convex portion 629 on the outer periphery of the second rotary cylinder 605 is fitted,
The cam cylinder 607 is formed in the rectilinear groove 627 on the inner circumference of the second rotary cylinder 605.
The convex portion 634 on the outer periphery of is fitted.

Therefore, the first rotary barrel 603, the second rotary barrel 605, and the cam barrel 607 are respectively driven forward and backward while integrally rotating around the optical axis O.

Further, the first rotary cylinder 603 and the first rectilinear frame 6
02, the second rotary cylinder 605 and the second rectilinear frame 604, and the cam cylinder 607 and the third rectilinear frame 606 are respectively provided with the bayonet 615, 623, and 630 for the rotary frames with respect to the linear frames. Alternatively, the cam barrels are rotatable relative to each other and are coupled in a thrust-stopped state in which they are integrated in the thrust direction.

Then, a female helicoid 614 on the inner periphery of the fixed barrel 601 and a male helicoid 61 on the outer periphery of the first rotary barrel 603.
Further, the male helicoid 622 on the outer circumference of the annular portion 624 of the second rectilinear frame 604 and the female helicoid 620 on the inner circumference of the first rotary cylinder 603 are helicoid-fitted with each other.

Further, the cam groove 62 on the inner circumference of the second rotary cylinder 605.
8 and the cam pin 641 fixed to the outer periphery of the annular portion 633 of the third rectilinear frame 606 are cam-fitted.

Further, the first, second, and
In the cam groove 635 for zooming the third lens group, a cam pin 636 on the outer circumference of the first lens group barrel 608, a cam pin 637 on the outer circumference of the second lens group frame 609, and a third lens group frame 61.
Cam pins 638 on the outer periphery of 0 are cam-fitted with each other.

Next, the feeding operation of the conventional zoom lens frame 600 having the above-mentioned structure will be described. The extension of the zoom lens frame 600 is basically performed by the straight engagement and the helicoid fitting with the next stage, or the double ring engaged with the cam relatively rotating inside and outside. , The next stage feeding is performed.

First, the feeding of the first rotary cylinder 603 in the second stage is based on the following action. That is, when the payout gear 611 provided in the gear chamber 612 on the inner circumference of the fixed barrel 601 is rotationally driven by a drive mechanism (not shown), the spur gear provided on the male helicoid 619 meshing with the payout gear 611 is used. The first rotary cylinder 603 rotates. First
The rotary cylinder 603 is a female helicoid 6 on the inner circumference of the fixed cylinder 601.
Since it is fitted in the helicoid 14 together, when it is rotated, it advances along the male helicoid 614 while rotating. When the first rotary cylinder 603 moves forward, the first rotary cylinder 603
The first rectilinear frame 602, which is thrust-stopped, also advances so as to be pulled by the first rotary cylinder 603.

At this time, the first rectilinear frame 602 is fixed to the fixed barrel 6.
01 is linearly engaged with the straight groove 613 and is in a relatively rotatable relationship with the first rotary cylinder 603.
It moves forward without rotating for 1.

Next, the feeding action of the second rotary cylinder 605, which is the third stage, will be described. When the first rotary cylinder 603 and the first rectilinear frame 602 rotate relatively, the first rotary cylinder 603 described above.
Engages linearly with the first rectilinear frame 602 and also rotates relative to the second rectilinear frame 604 whose rotation is restricted. Male helicoid 6 on the outer circumference of the annular portion 624 of the second rectilinear frame 604
22 and the female helicoid 620 on the inner circumference of the first rotary cylinder 603 are engaged with each other by the helicoid.
The second rectilinear frame 604 moves forward due to the relative rotation of.

When the second rectilinear frame 604 moves forward, the second
The second rotary cylinder 6 in a thrust stop relationship with the rectilinear frame 604.
05 will also move forward. The second rotary cylinder 605 is the first rotary cylinder 60.
Since it is engaged in the rectilinear groove 621 of No. 3, the first rotary cylinder 60
Move forward while rotating with 3. In addition, the second straight frame 60
Since No. 4 is engaged with the first rectilinear frame 602 in a rectilinear manner, it goes straight without rotating. The second rotary cylinder 605 and the second rectilinear frame 604 are in a relative rotation relationship.

Next, the feeding action of the cam barrel 607 which is the fourth stage will be described. The second rotary cylinder 605 and the second rectilinear frame 60
When 4 relatively rotates, the third rectilinear frame 606, which is restricted in rotation (engaged in rectilinear motion) by the second rectilinear frame 604, is driven forward by the rotation of the cam-fitted second rotary cylinder 605. That is, since the cam pin 641 provided on the outer circumference of the annular portion 633 of the third rectilinear frame 606 is cam-fitted into the cam groove 628 on the inner circumference of the second rotary cylinder 605, the third rectilinear frame 6 is formed.
06 advances along the cam groove 628.

When the third rectilinear frame 606 moves forward, the third frame
A cam cylinder 607 that has a thrust stop relationship with the rectilinear frame 606.
Will also move forward. Since the cam barrel 607 is engaged with the straight advance groove 627 of the second rotary barrel 605, it moves forward while rotating with the second rotary barrel 605. Further, since the third rectilinear frame 606 is linearly engaged with the second rectilinear frame 604 via the groove portion 632, the third rectilinear frame 606 travels straight without rotating. The cam barrel 60
7 and the third rectilinear frame 606 are in a relative rotating relationship.

Next, the feeding operation of each lens group cylinder 608 and the lens group frames 609 and 610, which is the fifth stage, that is, the zooming operation of each lens group held in each lens group cylinder will be described. The first lens group cylinder 608 is
Since it is linearly engaged with the third rectilinear frame 606 via the groove portion 642 and is cam-fitted with the cam cylinder 607, when the third rectilinear frame 606 and the cam cylinder 607 rotate relatively. The first lens group cylinder 608 advances along the first lens group zooming cam groove 635 on the inner circumference of the cam cylinder 607. Since the first lens group cylinder 608 is linearly engaged with the third rectilinear frame 606 of the rectilinear driving system, it moves forward without rotating.

On the other hand, the second and third lens group frames 609,
610 is the groove portion 639, which is the same as the third rectilinear frame 606.
Since it is linearly engaged via 640 and is cam-fitted with the cam barrel 607, similarly to the feeding action of the first lens barrel 608, the second lens group and the second lens group on the inner circumference of the cam barrel 607, respectively. Along the 3 lens group zooming cam groove 635,
It moves forward without rotating.

The above-mentioned first lens group cylinder 608, second and third
With the extension of the lens group frame cylinders 609 and 610, the zooming drive of the first, second and third lens groups 651, 652 and 653 is performed without rotation. Therefore, the first, second, and third lens groups 651, 652, 6
The reference numeral 53 is drawn out without rotating with respect to the fixed barrel 601 fixed to the camera body, that is, the film surface 660, and is prevented from being affected by the optical misalignment of the lens groups.

With the above operation, zooming of the conventional zoom lens frame 600 is performed. In addition, the action at the time of retracting (retracting) is the same as the above-mentioned retracting gear 611.
Is reversely rotated with respect to the feeding direction, thereby performing the action opposite to the above-described feeding.

Next, another conventional zoom lens frame 700 having a part of the frame structure different from that of the conventional zoom lens frame 600 will be described with reference to FIGS. FIG. 14 is a vertical sectional view of the other conventional zoom lens frame in a retracted state, and FIG. 15 is a vertical sectional view of the zoom lens frame in a telescopic state. 16 is an exploded perspective view of a part of the zoom lens frame.

As shown in the exploded perspective view of FIG. 16, this conventional zoom lens frame 700 is different from the second rotary barrel 605 and the third rectilinear frame 606 applied to the zoom lens frame 600 in the second rotation. The cylinder 705 and the third rectilinear frame 706 are applied.
Other configurations are similar to those of the conventional zoom lens frame 600 described above.

A female helicoid 728 is provided on the inner peripheral surface side of the second rotary cylinder 705. Second rotary cylinder 705
The configuration other than the above is similar to that of the second rotary cylinder 604.

The third rectilinear frame 706 is provided with a male helicoid 741 at the rear end side annular portion. When the zoom lens frame 700 is assembled, the male helicoid 741 of the third rectilinear frame 706 is screwed into the female helicoid 728 of the second rotary cylinder 705, so that the third rectilinear frame 706 and the second rotary cylinder 705 can rotate relative to each other. Along with this, the third rectilinear frame 706 is extended forward. The third straight advance frame 706 has the same configuration as the third straight advance frame 606 other than the above.

The operation of the cam barrel during the zooming operation in the conventional zoom lens frame 700 is performed by the conventional zoom lens frame 60 described above.
The operation is the same as 0.

Further, as another conventional lens frame by the helicoid fitting, the number of steps is different from that of the zoom lens frame described above,
There is one disclosed in Japanese Utility Model Publication No. 7-36337.

[0053]

As is the case with the conventional zoom lens frame described above, in general, in the multi-stage zoom lens frame,
Each stage is composed of a frame having a double ring structure, that is, two frames of a rectilinear frame and a rotary cylinder that rotates with respect to the frame.

As described above with respect to the extending action of the conventional zoom lens frame 600, the diameter of the lens frame tends to be thick because the double ring structure as described above is inevitably used for extending. In addition, the retractable length, that is, the length in the optical axis direction when the zoom lens frame is housed in the fixed barrel becomes long. Therefore, the weight of the zoom lens frame itself becomes heavy. Further, as described above, there is a recent demand for a higher zoom magnification, which requires a further multi-stage zoom lens frame, which tends to make the zoom lens barrel heavier. is there.

If the zoom lens frame is heavy, it is necessary to take measures against flexural strength between the connecting portion between the camera body and the fixed barrel.
In particular, when the zoom lens frame is long (telephoto state), when holding the camera during shooting, or when placing the camera on a desk or the like in that shooting condition, the moment acting on the zoom lens frame with respect to the camera body It becomes large, and the connecting portion is required to have a great flexing resistance (falling) strength. As a countermeasure for this, the connecting part becomes heavy, which has been a problem.

If the zoom lens frame is heavy, problems such as easy image skipping occur even if the helicoid engagement state (meshing state) slightly changes during zooming. Therefore, there is a demand for a zoom lens frame that is light in weight and capable of smoothly moving an image even if there is a change in the meshing state of the helicoid.

Further, conventionally, in order to reduce the weight of the zoom lens frame, as a known technique, a metal press part by press molding which is superior in strength to a resin molded product and has a lighter and thinner wall is used as a rectilinear frame. Sometimes. However, in the case of a straight-moving frame made of metal press parts, only one plate can be erected when the plate-like portion that vertically protrudes from the annular portion toward the opposite film surface side is bent from the inside diameter side of the annular shape. Since the length is also limited, there arises a problem that it is not possible to stably guide straight ahead even when the attitude of the zoom lens frame changes. On the other hand, if the plate-like portion is provided by bending it from the outer diameter side of the annular portion, the number of pieces is not limited,
This causes a problem that the diameter of the lens frame becomes large.

For this reason, in the case of the straight-moving frame using the above-mentioned metal press parts, the optical core accuracy cannot be maintained with respect to the posture change such as changing the direction of the camera at the time of photographing.
A straight frame made of a resin molded product is used, which can be formed with three plate-shaped portions so as to maintain the accuracy of the optical core, and the length of which is secured. In this case, from the viewpoint of strength, the entire rectilinear frame becomes thick, and the outer diameter of the cylindrical member such as the first rotary cylinder, the second rotary cylinder or the cam cylinder arranged on the outer peripheral side also becomes large, This is not necessarily advantageous in reducing the size and weight of the zoom lens frame.

The plate-shaped portion functions as a straight-moving engagement of each frame member, and is also called a straight-moving key.

The present invention has been made to solve the above-described problems, and provides a zoom lens frame which can be made compact and lightweight, or a zoom camera having the zoom lens frame. With the goal.

[0061]

According to a first aspect of the present invention, there is provided a zoom lens frame, wherein a double structure of a rotating cylinder member and a rectilinear frame arranged inside thereof is provided as a single stage, which is connected in multiple stages. Then, in the zoom lens frame for performing the operation of extending and retracting with respect to the fixed cylinder attached to the zoom camera, the female helicoid screw provided on the inner peripheral surface of the rotating cylinder member and the above-mentioned female member are connected to the cylinder member. And a male helicoid screw provided on the outer peripheral surface of the plate-like portion that defines the direction in which the straight-moving frame is arranged in the straight-lined frame.

In the zoom lens frame according to the second aspect of the present invention, the double structure of the rotating cylindrical member and the straight advancing frame disposed inside thereof and advancing straight is taken as one step and connected in multiple steps, and attached to the zoom camera. In the zoom lens frame for performing the operation of extending and retracting with respect to the fixed cylinder, at least one of the rectilinear frames is made of a metal injection molding member.

In the zoom lens frame according to claim 3 of the present invention, a double structure of a rotating tubular member and a rectilinear frame that is disposed inside thereof and travels straight is provided as a single stage, which is connected in multiple stages and attached to the zoom camera. In a zoom lens frame that performs operations of extending and retracting with respect to a fixed cylinder, a female helicoid screw provided on the inner peripheral surface of the rotating cylinder member, connected to the cylinder member, and arranged in a step above it. The male helicoid screw provided on the outer peripheral surface of the plate-like portion that determines the direction in which the rectilinear frame moves in the straight frame obtained by metal injection molding is fitted in a helicoid.

A zoom camera according to claim 4 of the present invention comprises:
A zoom camera provided with a zoom lens frame that performs a reciprocating and reciprocating operation with respect to a fixed cylinder by forming a double structure of a rotating cylinder member and a rectilinear frame that is arranged inside thereof and advances straight In, a rotatable tubular member provided with a female helicoid screw on the inner circumferential surface thereof, and an outer circumferential surface of a plate-like portion which is connected to the tubular member, is arranged in a step above the tubular member, and is formed so as to determine the direction of the straight movement. And a straight advancing frame provided with a male helicoid screw, and the female helicoid screw of the tubular member and the male helicoid screw of the plate-like portion of the rectilinear frame are fitted in a helicoid.

A zoom camera according to claim 5 of the present invention comprises:
A zoom camera provided with a zoom lens frame that performs a reciprocating and reciprocating operation with respect to a fixed cylinder by forming a double structure of a rotating cylinder member and a rectilinear frame that is arranged inside thereof and advances straight In, at least one of the rectilinear frames is made of a metal injection molding member.

A zoom camera according to claim 6 of the present invention comprises:
A zoom camera provided with a zoom lens frame that performs a reciprocating and reciprocating operation with respect to a fixed cylinder by forming a double structure of a rotating cylinder member and a rectilinear frame that is arranged inside thereof and advances straight In the above, a rotatable cylindrical member having an internal peripheral surface provided with a female helicoid screw, and a frame member formed by metal injection molding, which is connected to the cylindrical member, is arranged in a step above the cylindrical member, and moves straight. And a straight advancing frame provided with a male helicoid screw on the outer peripheral surface of the plate-shaped portion formed so as to determine the direction in which the female helicoid screw of the tubular member and the male helicoid screw of the plate-shaped portion of the rectilinear frame Mating.

[0067]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. Prior to detailed description of the first and second embodiments, an outline of the above embodiments will be described.

One of the gist of the present invention is to provide a multi-stage zoom lens frame or a zoom camera provided with the multi-stage zoom lens frame, wherein the extension of a certain stage is a female member on the inner circumference of the tubular member of that stage. This is performed by helicoid fitting between a helicoid and a male helicoid provided on a straight-moving frame on the upper (driving side) stage thereof. In the following description of the outline, only the feeding action of the stage to which the present invention is applied will be described.

In a multi-stage zoom lens frame, the tubular member of the stage to which the present invention is applied is referred to as a tubular member A. The cylindrical member A corresponds to the second rotary cylinder 104 in FIGS. 1 and 2 described later, and the cam cylinder 206 in FIGS. 6 and 7.

A female helicoid is provided on the inner circumference of the cylindrical member A. The straight advancing member and the tubular member that constitute the step above the step of the tubular member A (the film surface side in the feeding state) are referred to as a straight advancing frame B and a tubular member B, respectively. In addition, the straight-ahead frame B is the first straight-ahead frame 103 in FIGS.
In FIGS. 6 and 7, the second straight advance frames 205 correspond to each other.

The rectilinear frame B is provided with a male helicoid on the outer periphery of the projecting plate-shaped portion of the rectilinear frame B, which is fitted in a helicoid with a female helicoid on the inner periphery of the cylindrical member A. The tubular member B is a tubular member that is in a relatively rotatable state by a bayonet or the like with respect to the rectilinear frame B and has a thrust stop coupling relationship in which relative thrust positions are integrated. The tubular member B corresponds to the first rotary barrel 102 in FIGS. 1 and 2, and the second rotary barrel 204 in FIGS. 6 and 7.

The tubular member A is guided by the straight guide groove on the inner periphery of the tubular member B, and has a rotational coupling relationship with the tubular member B that moves forward and backward integrally with the tubular member B around the optical axis. is there.

When the cylindrical member B and the rectilinear frame B are relatively rotated, the cylindrical member A is linearly fitted to the cylindrical member B and is helicoid fitted to the rectilinear frame B.
Moves forward while rotating along the helicoid of the rectilinear frame B. In addition, the relative rotation amount between the above-mentioned tubular member B and the above-mentioned rectilinear frame B is, in fact,
Since it only goes straight, the amount of rotation on the side of the rotary cylinder corresponds.

On the other hand, the rotation of the rotary cylinder A corresponding to the cylindrical member in the conventional lens frame is performed by a male helicoid provided on the outer circumference of the annular portion of the straight advance frame (referred to as the straight advance frame A) at the same stage as the rotary cylinder A. , The helicoid fitting with the female helicoid on the inner circumference of the rotary cylinder B on the upper drive side.

In the above-mentioned conventional lens frame, the male helicoid provided on the outer circumference of the annular portion of the rectilinear frame A arranged inside the rotary cylinder A and the female helicoid on the inner circumference of the rotary cylinder B above it. The helicoid fitting length was required to be about 5 mm in the optical axis direction (the direction in which the rotary cylinder is extended) so that sagging on the tip side of the lens frame does not occur in the extended state.

The sagging on the front end side of the zoom lens frame is the amount of displacement when the front end of the zoom lens frame is tilted downward or in another direction because the fitting portion in the middle of the zoom lens frame is short. is there. When the amount of sagging is large, the linearity of the lens frame cannot be maintained, and the optical performance deteriorates.

In the lens frame of the embodiment of the present invention, as described above, the structure in which the female helicoid on the inner peripheral surface of the rotary cylinder A and the male helicoid on the protruding plate portion of the rectilinear frame B are fitted with each other is adopted. There is. Therefore, regarding the length in the optical axis direction of the outer peripheral portion of the annular portion of the straight-moving frame A, conventionally, a fitting length of 5 mm was required in the extended state, but according to the embodiment of the present invention, While maintaining the helicoid length of 5 mm as in the conventional case, the length of the annular portion may be about 1 mm as the thickness (length) required for the straight engagement. Therefore,
The volume of (about 4 mm length) × (area of the annular portion) can be reduced in weight. Of course, the retractable length of the lens frame can be shortened by 4 mm, and the lens frame can be made compact in the retracted state. In addition, the rotary cylinder A is the space omitted.
The thrust length can be increased. Thereby, a zoom lens frame having a longer telephoto lens frame length can be obtained. When the present invention is applied to a cam barrel,
The shape of the inner peripheral surface can be easily formed.

In the first embodiment described later, the present invention is applied to a general rotary cylinder, and in the second embodiment, the positioning function for zooming the lens group (camming groove for zooming) is included in the rotary cylinder. The present invention is applied to a rotary cylinder called a cam cylinder having a bracket.

The zoom lens frame according to the first embodiment of the present invention will be described below with reference to FIGS. 1 and 2,
[Fig. 2] is a vertical sectional view of the zoom lens frame of the first embodiment, Fig. 1 shows a retracted state, and Fig. 2 shows a tele (telephoto) state. FIG. 3 is an exploded perspective view of the zoom lens frame. In the following description, the film surface 160 side will be referred to as the rear side (or upper side), and the subject side (counter film side) will be referred to as the front side (or lower side).

The zoom lens frame 100 of the present embodiment is a lens frame capable of five-stage extension type zooming. When the zoom lens frame 100 is in the retracted state, as shown in FIG. 1, the respective retractable tubular members are retracted to the retracted position inside the fixed barrel 101. Then, the zoom lens frame 100
When the camera is in the telephoto state in which the shooting can be performed, as shown in FIG. 2, each tubular member is extended forward from the fixed barrel 101.

The zoom lens frame 100 is a lens frame having a five-stage configuration as described above, and as shown in FIGS. 1 and 2, a fixed barrel 101 which is a first-stage tubular member on the film surface 160 side,
A first rotary cylinder 102, which is a cylinder member of the second-stage double ring structure, and a first straight advance frame 103 which is a straight-moving frame inside thereof, and a second rotary cylinder which is a cylinder member of the third-stage double ring structure. 104 and a second straight advance frame 105 which is a straight advance frame inside thereof, a cam cylinder 106 which is a cylinder member of a fourth-stage double ring structure and a third straight advance frame 107 which is a straight advance frame inside thereof, and the most distal side The first lens group cylinder 108 of the fifth stage, the second lens group frame 109 and the third lens group frame 110 housed inside the cam cylinder 106, and the payout gear 128.

The first lens group cylinder 108, the second lens group frame 109, and the third lens group frame 110 each include a first lens group 151, a second lens group 152, and a third lens, each of which is composed of a plurality of lens groups. The optical axis of the lens 153 is O
Holding on.

In the present zoom lens frame 100, the female helicoid formed on the inner peripheral surface of the second rotary cylinder 104 of the second stage having a double ring structure and the double ring structure on the drive side are formed as will be described later. The plate-like portion 1 for guiding straight of the first straight frame 103 of the first stage
One of the features is that the male helicoid formed on the outer peripheral surface of 16 is engaged with the helicoid. Hereinafter, each component of the zoom lens frame 100 will be described in detail with reference to FIGS.

The fixed barrel 101 is fixedly supported inside the front side of the camera body 11 of the zoom camera 10 shown in FIGS. The fixed cylinder 101 is provided with a female helicoid 112 and a rectilinear groove 125 on its inner circumference. Further, a gear chamber 127 for housing the feeding gear 128 is arranged in the fixed cylinder 101.

The feeding gear 128 is a long spur gear and is rotatably supported in the gear chamber 127 of the fixed barrel 101, and the teeth of the gear are passed through the inner peripheral opening of the fixed barrel 1.
It is exposed inside 01.

The first rotary cylinder 102 is a cylinder-shaped cylinder member, and is arranged inside the fixed cylinder 101. First rotary cylinder 1
A straight groove 126 is provided on the inner periphery of 02. A male helicoid 113 is provided on the outer periphery of the rear end side (film surface side) of the first rotary cylinder 102. The male helicoid 113 is engraved with the teeth of the spur gear on the threaded portion of the male helicoid 113. The spur gear portion meshes with a feeding gear 128 arranged in the fixed barrel 101.

The first rectilinear frame 103 is arranged inside the first rotary cylinder 103 and has an annular portion 129 at its rear end. Three plate-shaped portions 116 having narrow arc-shaped projections extending from the annular portion 129 in the direction parallel to the lens optical axis O toward the front (the direction opposite to the film surface) which is the extending direction of the zoom lens frame. It is provided. On the outer peripheral surface of the plate-shaped portion 116, the female helicoid 1 formed on the inner peripheral surface of the second rotating cylinder 104 described later is described.
A male helicoid 114 that fits in the helicoid 15 is formed. Further, on the outer circumference of the annular portion 129 of the first rectilinear frame 103, three convex portions 130 that are slidably fitted in the rectilinear grooves 125 of the inner circumference of the fixed cylinder 101 are provided.

The first rectilinear frame 103 and the first rotary cylinder 102 are
The bayonet 111 formed on the annular portion 129 of the first rectilinear frame 103 is coupled in a state of being engaged with an inner peripheral groove (not shown) formed on the inner peripheral surface of the rear end side of the first rotary cylinder 102. .
Therefore, the first rectilinear frame 103 and the first rotary cylinder 102 are
They are rotatable relative to each other and are joined together in a thrust-stopped state of advancing and retracting in the direction of the optical axis O integrally, forming a double-ring cylindrical member. In addition, when the first rectilinear frame 103 and the first rotary cylinder 102 are connected, the inner peripheral surface of the first rotary cylinder 102 and the plate-shaped portion 11 are connected.
A gap is provided between the member 6 and 6 so that another cylindrical member can be inserted.

The second rotary cylinder 104 is a cylindrical member, and is arranged inside the first rotary cylinder 102. On the inner periphery of the second rotary cylinder 104, which is the third stage, a female helicoid 115 that is helicoid-fitted with a male helicoid 114 that is formed on the outer periphery of the plate-shaped portion 116 of the first rectilinear frame 103 that is the second stage. Is provided. Further, the three rectilinear grooves 13 are formed on the inner peripheral surface where the female helicoid 115 is formed.
2 and the cam groove 137 are provided in a superposed state.

The straight groove 132 is provided in the cam barrel 10 which will be described later.
The three convex portions 131 on the outer circumference of 6 are three rectilinear grooves slidably fitted in the direction parallel to the optical axis O. The cam groove 13
Reference numeral 7 denotes a cam groove into which a cam pin 121 fixed to the outer circumference of the rear end side annular portion 142 of the third rectilinear frame 107 is slidably fitted.

Further, on the outer circumference of the rear end portion of the second rotary cylinder 104, there are provided three convex portions 133 slidably fitted in the straight grooves 126 on the inner circumference of the first rotary cylinder 102.

The second rectilinear frame 105 includes the second rotary cylinder 10
4 has an annular portion 134 on the rear end side. Three plate-like portions 118 each having a narrow arcuate projection extending from the annular portion 134 toward the front side in parallel with the optical axis O are provided. In addition, the outer circumference of the annular portion 134 has a first
Three groove portions 135 that penetrate the plate-shaped portion 116 of the rectilinear frame 103 and guide in the optical axis O direction are provided. , The second rectilinear frame 105 is moved to the first rectilinear frame 10 by the groove portion 135.
The plate-shaped portion 116 of 3 guides straight ahead.

Also, the second rectilinear frame 105 and the second rotary cylinder 10
The bayonet 117 formed on the annular portion 134 of the second rectilinear frame 105 is rotatably fitted in the inner peripheral groove 138 formed on the inner peripheral surface of the second rotary cylinder 104. Therefore, the second rectilinear frame 105 and the second rotary cylinder 104
Are coupled so as to be rotatable relative to each other and in a thrust stop state capable of integrally advancing and retracting in the direction of the optical axis O, and form a double-ring cylindrical member. In addition, when the second rectilinear frame 105 and the second rotary cylinder 104 are connected, the inner peripheral surface of the second rotary cylinder 104 and the plate-shaped portion 11 are connected.
There is a gap between the cylinder 8 and another cylinder member 8 into which another cylinder member can be inserted.

The cam barrel 106 is a cylindrical barrel member, and is arranged inside the second rotary barrel 104. A cam groove 141 for zooming is provided on the inner peripheral surface of the cam barrel 106. In the cam groove 141, the first lens group cylinder 1
08, the cam pin 124 provided on the outer peripheral surface of the rear end, the cam pin 123 provided on the outer peripheral surface of the second lens group frame 109, and the third
A cam pin 122 provided on the outer peripheral surface of the lens group frame 110 is slidably fitted. Further, at the rear end portion of the outer peripheral surface of the cam cylinder 106, the three rectilinear grooves 1 on the inner periphery of the second rotary cylinder 104 described above are provided.
Three convex portions 131 that are slidably fitted to the 32 are provided.

The third rectilinear frame 107 is arranged inside the cam barrel 106 and has an annular portion 142 on the rear end side.
Three plate-shaped portions 120 are provided which extend from the annular portion 142 toward the front side in parallel with the optical axis O and have arcuate protrusions with a narrow width. The inner peripheral surface of the plate-shaped portion 120 is provided with three groove portions 136 into which the plate-shaped portion 118 of the second rectilinear frame 105 is fitted so as to move back and forth. Furthermore, a cam pin 121 slidably fitted in a cam groove 137 on the inner circumference of the second rotary cylinder is fixed to the outer circumference of the annular portion 142 of the third rectilinear frame 107.

Then, the third rectilinear frame 107 and the cam barrel 1
The bayonet 119 formed on the annular portion 142 of the third rectilinear frame 107 is connected to the inner peripheral groove 139 formed on the inner peripheral surface of the cam barrel 106 so as to be relatively rotatable. Therefore, the third rectilinear frame 107 and the cam barrel 10 are provided.
Reference numeral 6 denotes a cylindrical member having a double ring structure, which is relatively rotatable and is coupled to each other in a thrust stop state of advancing and retracting integrally with each other in the optical axis O direction. The third rectilinear frame 107 and the cam barrel 10
6, the inner peripheral surface of the cam cylinder 106 and the plate-shaped portion 12
Between 0 and 0, there is a gap into which another tubular member can be inserted.

A relief groove 143 is formed on the outer periphery of the annular portion 142 of the third rectilinear frame 107. The plate-shaped portion 116 of the first rectilinear frame 103 is provided in the groove portion 13 of the second rectilinear frame 105.
After inserting 5, the clearance groove 143 of the third rectilinear frame 107 is inserted in a loosely fitted state.

The first lens group cylinder 108 is a cylindrical cylindrical member, and is arranged inside the cam cylinder 106. A first lens group 151 including a plurality of lenses is fixed to the first lens group cylinder 108 on the front end side on the optical axis O. A groove portion 146 is provided on the inner peripheral surface of the first lens group cylinder 108 so that the plate-shaped portion 120 of the third rectilinear frame 107 is fitted therein to guide the rectilinear movement. At the rear end portion on the outer peripheral side of the first lens group cylinder 108,
A cam pin 124 that fits into the cam groove 141 for positioning the first lens group on the inner peripheral surface of the cam barrel 106 is fixedly provided.

Second and third lens group frames 109 and 110
Is disposed inside the cam barrel 106, and is housed inside the fixed frame 101 together with the first lens group barrel 108 and the like in the lens barrel collapsed state. Second and third lens group frames 109, 1
10, a second lens group 152 and a third lens group 153 each composed of a plurality of lenses are held on the optical axis O, and the plate-shaped portions 120 of the third rectilinear frame 107 are provided on the outer peripheral surfaces thereof. Grooves 145, 14 that engage with and guide straightly
4 are provided. Further, on the outer circumferences of the second and third lens group frames 109 and 110, cam pins slidably fitted with the cam grooves 141 for positioning the second and third lens groups on the inner circumferential surface of the cam barrel 106. 123 and 122 are fixed respectively.

Next, each frame member in the zoom lens frame 100 of the present embodiment having the above-described structure has the following coupling relationship. In the coupling relationship of the present zoom lens frame 100, a female helicoid 115 is provided on the inner circumference of the second rotary barrel 104, and one step above (rear drive side) coupled to the second rotary barrel 104. One of the features is that the male helicoid 114 is provided on the outer periphery of the plate-shaped portion 116 of the first rectilinear frame 103, and the male helicoid 114 is fitted and coupled with each other.

The convex portion 130 on the outer circumference of the annular portion 129 of the first rectilinear frame 103 is slidably fitted in the rectilinear groove 125 on the inner periphery of the fixed cylinder 101, and is inserted into the groove portion 135 of the annular portion of the second rectilinear frame 105. The plate-shaped portion 116 of the first rectilinear frame 103 is slidably fitted. Further, the plate-like portion 118 of the second rectilinear frame 105 is slidably fitted into the groove 136 formed inside the third rectilinear frame 107 plate-like portion 120. Furthermore, the third rectilinear frame 10
The groove portion 146 on the inner periphery of the first lens group cylinder 108 and the groove portion 1 on the outer periphery of the second lens group frame 109 with respect to the plate-shaped portion 120 of No.
45 and the groove 144 of the third lens group frame 110 are slidably fitted together. Therefore, the fixed cylinder 101
With reference to, the first rectilinear frame 103, the second rectilinear frame 105, the third rectilinear frame 107, the first lens group cylinder 108, the second lens group frame 109, and the third lens group frame 110 are restricted in rotation, respectively, and rectilinearly receded. It is supported as much as possible.

Incidentally, the plate-like portion 116 of the first rectilinear frame 103.
Is a clearance groove 143 formed on the outer circumference of the annular portion 142 of the third rectilinear frame 103 after being inserted through the groove portion 135 of the second rectilinear frame 105.
It is inserted in the state of loose fitting.

In addition, the straight groove 1 on the inner circumference of the first rotary cylinder 102.
26 and the convex portion 133 on the outer circumference of the second rotary cylinder 104 engage with each other, and the straight groove 132 on the inner circumference of the second rotary cylinder 104 and the cam cylinder 1
06 is engaged with the convex portion 131 on the outer periphery. Therefore, the first rotary cylinder 102, the second rotary cylinder 104, and the cam cylinder 10
The reference numerals 6 advance and retreat while being rotationally driven around the optical axis O in an integrated state.

Further, the first rotary cylinder 102 and the first rectilinear frame 1
03, the second rotary cylinder 104 and the second rectilinear frame 105, and the cam cylinder 106 and the third rectilinear frame 107 are the bayonet 1
11, 117 and 119 are connected to each other so as to be rotatable relative to each other and integrated in the thrust direction.

The inner circumference of the fixed barrel 101 and the first rotary barrel 1
The outer periphery of 02 is fitted with a helicoid. Second rotary cylinder 10
The inner circumference of 4 and the outer circumference of the first rectilinear frame 103 correspond to the second rotary cylinder 1
The female helicoid 115 on the inner periphery of 04 and the male helicoid 114 on the outer periphery of the plate-shaped portion of the first rectilinear frame 103 are coupled in a helicoid-fitted state. The fourth-stage cam cylinder 106
Subsequent first lens group cylinder 108 and second and third lens group frames 10
The coupling relationship up to 9,110 is the same as in the case of the conventional zoom lens frame 600 of FIG. 11 described above.

Next, the feeding operation of the zoom lens frame 100 described above will be described. It should be noted that during the feeding operation described below, the second rotary barrel 10 which is the third stage of the zoom lens frame 100.
The feeding of 4 is performed by helicoid fitting with a male helicoid provided on the plate-like portion of the first rectilinear frame 103 having the second stage, that is, the rectilinear frame of the stage one step higher than the second rotary cylinder 104. Is one of the features of the zoom lens frame 100. In addition, in the conventional zoom lens frame 600 shown in FIG. 11 with respect to the payout structure of the zoom lens frame 100, the payout operation at this stage is performed by the inner circumference of the first rotary cylinder and the annular portion of the second rectilinear frame. It was done by helicoid fitting or cam pin fitting.

First, when the first rotary barrel 102, which is the second stage of the zoom lens barrel 100, is fed out, the feeding gear 128 provided in the fixed barrel 101 is rotationally driven by a drive mechanism (motor and reduction gear) not shown. The rotation thereof drives the first rotary cylinder 102 to rotate through the spur gear portion of the female helicoid 113 that meshes with the gear 128.

Since the first rotary cylinder 102 is fitted in the inner circumference of the fixed cylinder 101 by a helicoid, the first rotary cylinder 102 advances forward while rotating along the female helicoid 112 when driven to rotate. When the first rotary cylinder 102 moves forward, the first rotary cylinder 102
The first rectilinear frame 103, which is thrust-stopped, also advances so as to be pulled by the first rotary cylinder 102. The first rectilinear frame 103 is linearly guided by the fixed cylinder 101 and is supported in a rotatable relationship with the first rotary cylinder 102.
Therefore, the first rectilinear frame 103 advances without rotating with respect to the fixed barrel 101. The first rotary cylinder 102 and the first
The rectilinear frame 103 is relatively rotatable.

Next, the extension of the second rotary cylinder 104, which corresponds to the third stage of the zoom lens frame 100, is performed as follows. As described above, when the first rotary cylinder 102 and the first rectilinear frame 103 rotate relative to each other, the first rotary cylinder 102 is supported so as to be integrally rotatable with the first rotary cylinder 102, and the first rectilinear frame 103 and the helicoid fit together. The second rotating cylinder 104 moving forward advances while rotating along the male helicoid 114 of the first rectilinear frame 103.

When the second rotary cylinder 104 moves forward while rotating, the second rectilinear frame 105, which is thrust-stopped with respect to the second rotary cylinder 104, also integrally advances in the optical axis O direction while being guided straight.

With the rotation and extension of the second rotary cylinder 104 and the rectilinear movement of the second rectilinear frame 105 described above, 4
The cam cylinder 106, which is the stage, is extended, and further, the first lens group cylinder 108 and the like are extended. The feeding action thereof is similar to that of the conventional zoom lens frame 600 shown in FIG.

In contrast to the above-mentioned feeding action, the retracting action at the time of collapsing is performed by the backward movement. Figure 1
The cross section of the lens frame of the present zoom lens frame 100 when it is collapsed is shown.

The conventional zoom lens frame 60 shown in FIG. 11 and the like described above.
In the example of 0, the male helicoid 622 in the annular portion of the second rectilinear frame 604 took up space in the thrust direction (helicoid fitting width direction) in the collapsed state, and the collapsed length could not be shortened. As described above, the reason why the length in the thrust direction of the male helicoid 622 of the annular portion is set to be long is the sagging on the tip side of the zoom lens frame in the extended state of the zoom lens frame, that is, the zoom. This is because it is necessary to secure a required helicoid fitting length in order to prevent the phenomenon that the tip portion of the lens frame tilts downward. For that reason, the length of the male helicoid 622 in the thrust direction is increased. However, since the lengthened male helicoid 622 is housed in the fixed barrel, the retractable length is increased.

Therefore, in the zoom lens frame 100 of this embodiment, the third rotary barrel 104 is extended by the male helicoid 114 provided on the plate-like portion 116 of the first rectilinear frame 103. A required helicoid fitting length is ensured by the male helicoid 114 of the plate portion 116 and the female helicoid 115 of the second rotary cylinder 104. Therefore, in the conventional zoom lens frame, the second
The space occupied in the thrust direction by the male helicoid on the annular portion of the rectilinear frame 604 becomes unnecessary. Therefore, the space occupied by the male helicoid length in the thrust direction in the conventional zoom lens frame can be added to the thrust length of the second rotary cylinder 104. Therefore, when the retractable length of the same extent as that of the conventional zoom lens frame is adopted, the extension lens frame length in the telephoto state can be increased as compared with the conventional one.

In the zoom lens frame 100 described above, it has been shown that the extension length in the tele state can be made longer with the zoom lens frame having the same retractable length. In other words, the extension length in the tele state is the same. Then, it means that the retractable length can be shortened. Therefore, the size of the lens frame can be reduced. In addition, the annular portion 13 of the second rectilinear frame 105
Since the thickness of 4 (thickness in the optical axis direction) is thin, it also leads to weight reduction of the entire lens barrel.

The state where the zoom lens frame 100 of the first embodiment is incorporated in the zoom camera is shown in the perspective views of FIGS. FIG. 4 shows the retracted state of the zoom camera 10,
FIG. 5 shows the zoom telephoto state. In the zoom camera 10, the zoom lens frame 100 shown in FIG. 1 and the like is mounted on the front surface of the camera body 11. Further, a finder window 12, an AF window and the like are additionally provided on the front surface of the camera.

When the zoom camera 10 is in the retracted state, that is, in the non-photographing state, as shown in FIG. 4, the tubular members from the first lens group barrel 108 to the first rotary barrel 102 are located inside the camera body 11. It is retracted to the retracted position inside the fixed barrel 101. When the zoom camera 10 is in the tele (telephoto) state through the wide-angle state in which photographing is possible, the respective tubular members from the first lens group barrel 108 to the first rotary barrel 102 are the fixed barrel 101 as shown in FIG. It is in the tele position that was extended from. In addition, when the zoom camera 10 is in the wide-angle state in which the image can be captured, the respective tubular members are in a position slightly extended from the retracted position.

When the zoom lens frame 100 is applied as described above, the total length Lc of the zoom lens frame in the collapsed state shown in FIG. 4 can be further shortened, and the zoom camera can be made compact or lightweight. To be done. Further, since the total length Lt of the zoom lens frame in the tele state shown in FIG. 5 can be made longer, it is possible to cope with the high zoom ratio of the zoom camera.

In the zoom lens frame 100 of the present embodiment, the third-stage rotating barrel and the second-stage straight moving frame of the five-stage zoom lens barrel, that is, in the double ring configuration, the second-stage rotating barrel and the first-stage rotating barrel. The helicoid fitting structure according to the present invention is applied to the rectilinear frame. However, the present invention is not limited to this number of stages,
Even a zoom configuration other than five stages can be applied to a fitting structure of a rotary cylinder of any stage and a rectilinear frame of an upper stage (driving side) thereof.

Further, in the zoom lens frame 100 of this embodiment, the third rotary barrel 104 is extended by the male helicoid 114 provided on the outer peripheral surface of the plate portion 116 of the first rectilinear frame 103. Configured to. However, the second
The same configuration can be applied to a lens frame structure in which a cylindrical member that is fitted in the inner peripheral side of the plate-shaped portion 116 so as to be rotatable and retractable is applied instead of the rotating cylinder 104. In that case, a female helicoid is provided on the inner peripheral portion of the plate-shaped portion of the rectilinear frame, and a male helicoid capable of fitting with the female helicoid is provided on the outer peripheral surface of the rotary cylinder. With such a configuration, the same effect as the above embodiment can be obtained.

Next, a zoom lens frame according to the second embodiment of the present invention will be described. FIGS. 6 and 7 are vertical cross-sectional views of the zoom lens frame of the present embodiment, and FIG.
Indicates a tele (telephoto) state. FIG. 8 is an exploded perspective view of the zoom lens frame. In the following description, the film surface 260 side will be referred to as the rear side (or the upper side), and the subject side (anti-film surface side) will be referred to as the front side (or the lower side).

The zoom lens frame 200 of this embodiment is a lens frame that has a 5-stage extension lens frame and is capable of zooming. When the zoom lens frame 200 is in the retracted state, the tubular members are retracted to the retracted position inside the fixed barrel 201 as shown in FIG. When the zoom lens frame 200 is in the tele (telephoto) state, as shown in FIG.
In, the tubular member forming each stage is extended forward from the fixed barrel 201.

In this zoom lens frame 200, the feeding of the cam barrel 206, which is the fourth-stage barrel member described later, is made up of the female helicoid 222 provided on the inner periphery of the cam barrel 206 and the upper (driving side) stage thereof. Second straight frame 2 which is the third straight frame
One of the features is that it is carried out by helicoid fitting with a male helicoid 221 provided on the outer periphery of the straight guide plate-shaped portion 218 formed in 05. Hereinafter, the configuration of the zoom lens frame 200 will be described in detail.

As shown in FIGS. 6 and 7, the zoom lens frame 200 includes a fixed barrel 201, which is a first stage tubular member on the film surface 260 side, and a second stage tubular member having a double ring structure. 1 rotary cylinder 202 and the 1st rectilinear frame 2 which is the rectilinear frame inside that
03, a second rotary cylinder 204 which is a cylinder member of a double ring structure of the third stage, and a second straight advance frame 205 which is a straight advance frame inside thereof.
And a cam barrel 206 which is a tubular member of a fourth-stage double-ring structure, a third rectilinear frame 207 which is a rectilinear frame inside thereof, a fifth-stage first lens group cylinder 208 on the most distal side, and Cam tube 2
It has a second lens group frame 209 and a third lens group frame 210 housed inside 06, and a payout gear 228.

The first lens group cylinder 208, the second lens group frame 209, and the third lens group frame 210 each include a first lens group 251, a second lens group 252, and a third lens group composed of a plurality of lens groups. The optical axis of the lens 253 is O
Holding on.

The structure of the fixed barrel 201 of the first stage, the first rotary barrel 202 and the first rectilinear frame 203 of the second stage is applied to the conventional zoom lens frame 600 described in FIG. 11 and the like. It has the same structure as the tubular member.

The second rotary cylinder 204 is a cylinder-shaped cylinder member, and has three protrusions on its outer periphery that engage with the rectilinear grooves 227 on the inner periphery of the first rotary cylinder 202 of the first stage having a double ring structure. Part 24
1 is provided. Further, the inner peripheral surface of the second rotary cylinder 204 is provided with three rectilinear grooves 243 for engaging with the three convex portions 235 on the outer circumference of the cam cylinder 206 in a rectilinear condition.

The second rectilinear frame 205 has an annular portion 232, and the annular portion 232 has an arc having a narrow width toward the film surface side (the same front side as the feeding side of the zoom lens barrel). Three projecting plate-shaped portions 218 are provided so as to project in parallel with the optical axis O. Then, the second straight frame 2 of the third stage
On the outer peripheral surface of the plate-shaped portion 218 of No. 05, a male helicoid 221 that helicoid-fits with the female helicoid 222 on the inner periphery of the cam cylinder 206 serving as the fourth-stage cylindrical member is provided.

Further, the annular portion 232 of the second rectilinear frame 205.
The female helicoid 2 on the inner peripheral surface of the first rotary cylinder 202
A male helicoid 215 is provided that fits in a helicoid with 14. Inside the plate-shaped portion 218 of the second rectilinear frame 205, a groove portion 242 is formed in which the plate-shaped portion 216 of the first rectilinear frame 203 is fitted in the rectilinear state.

Then, the second rectilinear frame 205 and the second rotary cylinder 2
04 is coupled with the bayonet 217 formed on the annular portion 232 of the second rectilinear frame 205 and the inner peripheral groove 244 formed on the inner peripheral surface of the second rotary cylinder 204 in an engaged state.
Therefore, the second rectilinear frame 205 and the second rotary cylinder 204 are rotatable relative to each other, and are coupled to each other in a thrust stop state of advancing and retracting integrally with each other in the optical axis O direction, and a cylinder having a double ring structure. Make a member. It should be noted that there is a gap between the inner peripheral surface of the second rotary cylinder 204 and the plate-shaped portion 218 when the second rectilinear frame 205 and the second rotary cylinder 204 are connected to each other so that another cylinder member can be inserted.

The cam barrel 206 is a tubular member having a cylindrical shape, and the outer peripheral surface on the rear end side is provided with three convex portions 235 which fit into the straight grooves 243 on the inner peripheral surface of the second rotary cylinder 204. ing. A female helicoid 222 is provided on the inner peripheral surface of the cam barrel 206 so as to be engaged with the male helicoid 221 on the outer peripheral surface of the plate-shaped portion 218 of the second rectilinear frame 205. Further, a cam groove 239 for zooming the lens group is provided in a state of overlapping with the female helicoid 222 on the inner peripheral surface of the cam barrel 206.

The third rectilinear frame 207 has an annular portion 233, and an arc projection having a narrow width from the annular portion 233 toward the side opposite to the film surface (the front side in the zoom lens frame feeding direction). Three plate-shaped portions 220 having a rectangular shape are provided so as to project in parallel with the optical axis O. In addition, the annular portion 23 of the third rectilinear frame 207
3 is provided with a groove portion 234 that fits in the plate-shaped portion 218 of the second rectilinear frame 205 in a rectilinear state.

Then, the third rectilinear frame 207 and the cam barrel 2
The bayonet 219 formed on the annular portion 233 of the third rectilinear frame 207 is connected to the inner peripheral groove 245 formed on the inner peripheral surface of the cam barrel 206 so as to be relatively rotatable. Therefore, the third rectilinear frame 207 and the cam barrel 20
Reference numeral 6 denotes a cylindrical member having a double ring structure, which is relatively rotatable and is coupled to each other in the optical axis O direction so as to integrally advance and retreat. It should be noted that there is a gap between the inner peripheral surface of the cam barrel 206 and the plate-like portion 220 when the third rectilinear frame 207 and the cam barrel 206 are connected, into which another tubular member can be inserted.

The first lens group cylinder 208 and the second and third lens group frames 209 and 210 have straight guide grooves 238, 237 and 236, respectively. The plate-shaped portion 220 of the third rectilinear frame 207 is slidably fitted in each groove. Further, the cam pins 225 are provided on the outer circumferences of the first lens group cylinder 208, the second and third lens group frames 209 and 210.
224 and 223 are fixedly provided. The cam pins are formed by the female helicoid 222 on the inner peripheral surface of the cam barrel 206.
It is slidably fitted in a zoom driving cam groove 239 which is provided so as to overlap with the above. Therefore, as the cam barrel 206 rotates, the first lens group barrel 208 and the second and third lens group frames 209 and 210 are driven to move back and forth to their respective zoom positions.

Next, each frame member in the zoom lens frame 200 of the present embodiment having the above-described structure has the following coupling relationship. That is, the annular portion 23 of the first rectilinear frame 203 is formed in the rectilinear groove 226 on the inner circumference of the fixed cylinder 201.
The convex portion 230 on the outer periphery of 1 is slidably fitted. The plate portion 216 of the first rectilinear frame 203 is slidably fitted into the groove 242 of the second rectilinear frame 205. Furthermore, the third straight frame 20
The plate-shaped portion 218 of the second rectilinear frame 205 is slidably fitted into the groove portion 234 of the annular portion 233 of No. 7. Therefore, the first straight advance frame 203, the second straight advance frame 205, and the third straight advance frame 207.
Are guided linearly along the optical axis O in a state in which their rotations are restricted with respect to the fixed barrel 201.

Further, the straight groove 2 on the inner circumference of the first rotary cylinder 202
27 and the convex portion 241 on the outer circumference of the second rotary cylinder 204, and the rectilinear groove 243 on the inner circumference of the second rotary cylinder 204 and the convex portion 235 on the outer circumference of the cam cylinder 206 are slidably engaged with each other. . Therefore, the first rotary cylinder 202 and the second rotary cylinder 20
4 and the cam barrel 206 rotate integrally with each other around the optical axis O and are driven back and forth.

Further, the first rotary cylinder 202 and the first rectilinear frame 2
03, the second rotary cylinder 204 and the second rectilinear frame 205, and the cam cylinder 206 and the third rectilinear frame 207 are held by the bayonets 211, 217 and 219 in a thrust-stopped state. Therefore, each of them is relatively rotatable and is held in an engagement relationship in which it advances and retreats integrally in the optical axis O direction.

Further, the inner circumference of the fixed barrel 201 and the first rotary barrel 2
The outer circumference of 02, the inner circumference of the first rotary cylinder 202, and the outer circumference of the annular portion 232 of the second rectilinear frame 205 are helicoid-fitted. Further, the plate-shaped portion 218 of the second rectilinear frame 205
The outer periphery of the cam cylinder 206 and the inner periphery of the cam cylinder 206 are in a helicoid fit.

The first lens group barrel 208, the second and third lens group frames 209 and 210, the cam barrel 206,
The engagement relationship related to the third rectilinear frame 207 is the same as that of the conventional zoom lens frame 600 shown in FIG. 11 and the like.

Next, the feeding operation of the zoom lens frame 200 described above will be described. The second rotary cylinder 20 which is the third stage
The operation up to the delivery of 4 is the same as the operation of the conventional zoom lens frame 600 described with reference to FIG. Hereinafter, the extension of the zoom lens frame 200 after the second rotary cylinder 204 in the third stage will be described.

The second rotating barrel 204 and the second rectilinear frame 205 move forward while relatively rotating as the zoom lens frame 200 moves out. The second rotary cylinder 204 and the second rectilinear frame 20
When 5 relatively rotates, the cam cylinder 206 that is in a helicoidal fit with the second rectilinear frame 205 and that is engaged with the second rotary cylinder 204 in the rectilinear groove 243 is the plate-shaped portion of the second rectilinear frame 205. The male helicoid 221 on the outer peripheral surface of 218 moves forward while rotating. When the cam barrel 206 moves forward, the cam barrel 2
No. 06 and the third rectilinear frame 207 which is in a thrust stop coupled state.
Moves forward together with the cam barrel 206 in the non-rotating state.

The first lens group cylinder 208 and the second lens group frame 2
09 and the third lens group frame 210 are each lens group provided on the inner periphery of the cam barrel 206 while being linearly guided by the third rectilinear frame 207 like the conventional zoom lens frame 600 shown in FIG. Zooming is performed along the zooming cam 239 for use.

The operation of the zoom lens frame 200 described above is an operation at the time of extension, but at the time of collapsing, retraction (collapsing) is performed by an operation reverse to the above.

In the zoom lens frame 200 of this embodiment, the first and second stages, the second and third stages, and the third stage of the zoom lens frame are further used.
The second and fourth steps are helicoid fitted. Incidentally, in the zoom lens frame 100 of the first embodiment described above, the third and fourth stages are cam-fitted.

3 of the second rotary cylinder 204 of the zoom lens frame 200
When the helicoid fitting applied to the conventional zoom lens frame 700 shown in FIGS. 14 to 16 is applied to the fourth step and the fourth step of the cam barrel 206, the collapsed state of FIGS. As shown in, the annular portion 62 of the second rectilinear frame 604.
The male helicoid 622 on the outer periphery of No. 4 and the male helicoid 741 on the outer periphery of the annular portion 733 of the third rectilinear frame 706 need to occupy two tiers of space in the thrust direction, which is disadvantageous for shortening the retractable length of the lens frame. Become.

However, in the zoom lens frame 200 of the present embodiment, the space occupied by the male helicoid in the thrust direction at the time of collapsing is one stage of the male helicoid 215 on the outer circumference of the annular portion 232 of the second rectilinear frame 205. (FIG. 6), the retractable length of the lens frame can be shortened.

As described above, the zoom lens frame 20 of this embodiment
According to 0, the collapsible length can be shortened or the lens barrel extension length in the telephoto state can be increased as in the case of the first embodiment, which leads to weight reduction of the entire lens frame.

Further, when the cam barrel 206 of the zoom lens frame 200 of this embodiment is applied, the following additional value is produced. That is, the female helicoid 222 and the cam groove 239 for zooming the lens group are provided side by side on the inner circumference of the cam barrel 206 incorporated in the zoom lens frame 200 of the present embodiment.

On the other hand, there is also a conventional zoom lens frame in which a female helicoid and a cam groove for zooming are provided side by side on the inner periphery of the cam barrel. In this case, the female helicoid provided on the inner periphery of the cam barrel is , The male helicoid on the outer periphery of the first lens group barrel is fitted with the helicoid.

FIG. 17 is a development view of the inner peripheral surface of the conventional cam barrel, and FIG. 18 is a sectional view taken along line BB of FIG.
The cross-sectional shapes of the female helicoid and the cam groove are shown. In addition,
The inner peripheral surface of the cam cylinder 801 to which the above-mentioned engagement form is applied is provided with a lead of the zooming cam groove 803 and a female helicoid 80.
The directions of the two leads are formed so as to be inclined in the same direction in all the zooming regions of the lens group frames.

As shown in FIG. 17, when the cam groove 803 for the lead of the same direction is formed on the surface of the female helicoid 802 like the conventional cam barrel 801, the screw thread of the helicoid is deleted at an angle close to the lead. As a result, the thin island portion 804 and the narrowed portion 805 are formed. Since the island portion 804 and the constricted portion 805 are thin, they are weak against a lateral force and are easily broken. In addition, there is a problem in that it is difficult to ensure accuracy during molding. Furthermore, FIG.
As shown in FIG. 8, in the cross section orthogonal to the lead direction, the tips of the island-shaped portion 804 and the constricted portion 805 form sharp edges 806 and 807. Therefore, there is a concern that the tip of the edge may be chipped or easily deformed by impact or the like.

On the other hand, in the case of the zoom lens frame 200 of this embodiment, the cam barrel 206 has a female helicoid on the inner peripheral surface thereof, which helicoid fits with the second rectilinear frame 205 which is the rectilinear frame of the upper stage as described above. 222 and a zooming cam groove 239 which is cam-fitted to each lens group frame, and a development view thereof is shown in FIG. 10 is a cross-sectional view taken along the line AA of FIG. Note that the lens group frame is specifically the first
A lens group cylinder 208, a second lens frame 209, and a third lens group frame 210.

As shown in FIG. 9, the lead direction of the female helicoid 222 and the lead direction of the cam groove 239 on the inner peripheral surface of the cam barrel 206 are opposite to each other in the zooming regions of all the lens group frames, that is, to each other. They are arranged along the intersecting direction. Therefore, even if the female helicoid 222 is divided into two by the cam groove 239 as shown in FIG. 10, the island-shaped portion 804 and the constricted portion 805 of FIG. 18 may be generated as in the conventional cam cylinder 801 described above. Instead, there are only strong lump-shaped peaks 222a and 222b. Therefore, it is possible to avoid the problems that have occurred in the conventional cam cylinder 801 described above, and it is easy to form the inner peripheral side shape.

As described above, according to the zoom lens frame 200 of this embodiment, it is possible to shorten the retractable length or increase the telephoto extension length, and at the same time, it is possible to reduce the weight of the entire zoom lens frame. Further, as described above, there is a merit in the shape of the cam cylinder.

Although the zoom lens frames 100 and 200 of the above-described first and second embodiments are the zoom lens frames having the five-step zoom structure, the present invention can be applied to zoom lens frames other than the five-step structure. It is possible to apply the gist and obtain the same effect.

Further, in the zoom lens frames 100 and 200 described above, the lens groups constituting the zoom lens are applied to those of a three-group zoom type, but the structure of the present invention is a lens frame having a zoom configuration of any number of groups. Applicable to

Further, in the zoom lens frames 100 and 200, the rectilinear frame 10 in which the male helicoid of the plate-like portion that fits into the female helicoid of the rotating tubular members 104 and 206 is provided.
Although 3, 205 is on the drive side one step higher than the rotating tubular members 104, 206, it is not necessarily limited to this.
The rotating tubular members 104 and 206 are straighter than the straight frame 10.
Similar effects can be obtained on the drive side with respect to 3,205.

Next, a zoom lens frame according to a third embodiment of the present invention will be described with reference to FIGS. In the zoom lens frame of the present embodiment, a thixomolding member which is a metal injection molding member is applied to the first rectilinear frame.

The above-mentioned thixomolding method is a kind of magnesium molding method, and is a molding method of a metal material in which a mold having the same structure as the conventional resin molding can be used. Therefore, a component having a complicated shape, such as a resin mold, can be molded with a metal material such as magnesium. Further, by applying a thixomolding member to the rectilinear frame of the present zoom lens frame, the outer diameter of the zoom lens frame can be made thin and the weight of the zoom lens frame can be reduced.

The first rectilinear frame 203T shown in the exploded perspective view of the zoom lens frame of FIG. 8 is a thixomolding member made of a magnesium alloy as a metal injection molding member. The first rectilinear frame 203 of the thixomolding member
The T has an annular portion 231T, three plate-shaped portions 216T standing upright on the annular portion, and the like. Then, the first rectilinear frame 203T has a plate-shaped portion 216T with respect to the second rectilinear frame 205.
It is engaged so that it can go straight through. The second straight frame 20
5, the male helicoid 215 on the outer circumference of the annular portion 232 is helicoid fitted with the female helicoid 214 on the inner circumference of the first rotary cylinder 202. The engagement state of other parts is
All are the same as in the zoom lens frame 200 of the second embodiment.

A twisting force is applied to the plate portion 216T of the first rectilinear frame 203T via the second rectilinear frame 205. In the case of the zoom lens frame 200 of the second embodiment, the first rectilinear frame 20
Since a resin molded part is used for 3, the wall thickness is made thicker as in the case of the conventional zoom lens frame so as to have the strength to endure the twisting force. The first straight frame 203
The thickness of the annular portion 231, the plate-shaped portion 216, and the like becomes thicker in order to make the thickness thicker, and the weight of the parts becomes heavier, so that the weight of the entire zoom lens frame becomes heavier.

On the other hand, the magnesium alloy, which is the thixomolding member used for the first rectilinear frame 203T applied to the zoom lens frame of the present embodiment, has a specific gravity about 30% higher than that of plastic, but has a higher strength than resin molded parts. There are five times. Therefore, conventionally, the plate-shaped portion 216T of the first straight-moving frame 203T made of a magnesium alloy can be made thinner than the plate-shaped portion 216 of the first straight-moving frame 203 made of resin, and similarly, the plate-shaped portion 216T of the first straight-moving frame 203T can be made thinner. Ring part 231T
Can be thin.

Therefore, the zoom lens frame of this embodiment is
It becomes a member with a small outer diameter as a whole, and can be made lighter. For example, the plate-shaped portion 216T has a wall thickness of 25%.
It can be reduced by about 30%, and the first straight frame 20
The external dimensions of the 3T can be reduced accordingly, which allows the zoom lens frame to be made more compact than the conventional one, and the entire zoom lens frame can be made lighter. At this time, since the molding can be performed in the same manner as the resin molding, three plate-shaped portions can be formed, the length thereof can be secured, and the optical core accuracy can be maintained.

If the means of the zoom lens frame of the present embodiment is applied, the engagement form remains the same as in the conventional zoom lens frame 600 such as FIG. 11 cited as an explanation of the prior art. The zoom lens frame can be made compact, and in turn, the entire zoom lens frame can be made lighter.

In the zoom lens frame of the present embodiment, a thixomolding member is used as a metal injection molding member for the first rectilinear frame 203T, which is the first-stage rectilinear frame of the double ring structure having the most twisting force. However, the present invention is not limited to this, and other straight-line frames 20 of the second and third stages are used.
5,207, and even other tubular members, the same effect can be obtained.

Further, in the rectilinear frame of this embodiment, the thixomolding member is taken as an example of the metal injection molding member, but the invention is not limited to this, and other metal injection molding members such as aluminum die casting and magnesium die casting. A metal injection-molded member such as the one described above can also be applied, and the same effect can be obtained.

[0167]

According to the zoom lens frame or the zoom camera according to the first or fourth aspect of the present invention, in the zoom lens frame, the female helicoid screw provided on the inner circumference of the cylindrical member, and the cylinder By adopting a configuration in which the male helicoid screw provided on the plate-shaped portion of the straight frame of the upper part of the member is fitted with a helicoid, the length of the lens barrel in the retracted state of the zoom lens frame can be shortened or in the tele state. It is possible to increase the length of the lens frame of. Further, according to the zoom lens frame or the zoom camera to which the zoom lens frame is applied, it is possible to make the camera compact and lightweight, and it is also possible to cope with a high zoom ratio of the zoom camera.

According to the zoom lens frame or the zoom camera of claim 2 or 5 of the present invention, since the metal injection molding member is used for at least one rectilinear frame requiring strength, the rectilinear frame is obtained. Since the thickness and size of the zoom lens can be reduced compared to the resin straight frame, the zoom lens frame or the zoom camera to which the zoom lens frame is applied can be downsized and compacted.

According to the zoom lens frame or the zoom camera of claim 3 or 6 of the present invention, in the zoom lens frame, the female helicoid screw provided on the inner circumference of the cylindrical member is attached to the cylindrical member. Adopted a configuration in which a male helicoid screw provided on the plate-shaped portion of the upper straight frame is fitted with a helicoid
Moreover, since the metal injection molding member is used for the straight-moving frame, it is possible to shorten the lens frame length in the collapsed state of the zoom lens frame or increase the lens frame length in the tele state. Become. Further, since it is possible to reduce the thickness and the diameter of the straight-moving frame, it is possible to further reduce the size and weight of the zoom lens frame or the zoom camera to which the zoom lens frame is applied. It is also possible to support higher zoom ratios.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a zoom lens frame according to a first embodiment of the present invention, showing a collapsed state.

FIG. 2 is a vertical cross-sectional view of the zoom lens frame of the first embodiment of FIG. 1, showing a tele (telephoto) state.

FIG. 3 is an exploded perspective view of the zoom lens frame according to the first embodiment of FIG.

FIG. 4 is a perspective view of a zoom camera incorporating the zoom lens frame of the first embodiment of FIG. 1, showing a collapsed state.

5 is a perspective view of a zoom camera in which the zoom lens frame according to the first embodiment of FIG. 1 is incorporated, showing a telephoto state. FIG.

FIG. 6 is a vertical cross-sectional view of the zoom lens frame according to the second embodiment of the present invention, showing a collapsed state.

7 is a vertical cross-sectional view of the zoom lens frame of the second embodiment of FIG. 6, showing a tele (telephoto) state.

FIG. 8 is an exploded perspective view of the zoom lens frame of the second embodiment of FIG. 6 and the zoom lens frame of the third embodiment of the present invention.

9 is a development view of the inner peripheral surface of the cam barrel of the zoom lens frame according to the second embodiment of FIG. 6.

10 is a cross-sectional view taken along the line AA of FIG.

FIG. 11 is a vertical cross-sectional view of a conventional zoom lens frame in a collapsed state.

12 is a vertical cross-sectional view of the conventional zoom lens frame of FIG. 11 in a telescopic state.

13 is an exploded perspective view of the conventional zoom lens frame of FIG.

FIG. 14 is a vertical cross-sectional view of another conventional zoom lens frame in a retracted state.

15 is a vertical cross-sectional view of another conventional zoom lens frame of FIG. 14 in a telephoto state.

16 is an exploded perspective view of a part of another conventional zoom lens frame of FIG.

FIG. 17 is a development view of the inner peripheral surface of the cam barrel of still another conventional zoom lens frame.

18 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

10 ...... Zoom camera 100,200 ... Zoom mirror frame 103 ...... First straight frame (straight frame) 104 ... second rotary cylinder (rotating cylinder member) 114,221 ... Male helicoid (male helicoid screw) 115,222 ... Female helicoid (female helicoid screw) 116, 218 ... Plate-shaped part 203T: first straight frame (metal injection molding member) 205 ...... Second straight frame (straight frame) 206 ... Cam tube (rotating tube member)

Claims (6)

[Claims] 1. A double structure of a rotating cylinder member and a rectilinear frame that is arranged inside and rotates straight, and is connected in multiple stages to extend and retract operations with respect to a fixed cylinder attached to a zoom camera. In the zoom lens frame for carrying out the above, a female helicoid screw provided on the inner peripheral surface of the rotating tubular member, and a plate which is connected to the tubular member and determines the direction in which the linearly moving frame of the linearly moving frame arranged above the linearly moving direction is formed. A zoom lens frame, characterized in that a male helicoid screw provided on the outer peripheral surface of the shaped portion is engaged with the helicoid. 2. A double structure composed of a rotating cylinder member and a rectilinear frame which is arranged inside thereof and which advances straightly is defined as a single stage, which is connected in multiple stages to extend and retract the fixed barrel attached to the zoom camera. In the zoom lens frame for performing the above, at least one of the rectilinear frames is made of a metal injection molding member. 3. A double structure of a rotating cylinder member and a rectilinear frame that is arranged inside and rotates straight, and is connected in multiple stages to extend and retract with respect to a fixed cylinder attached to a zoom camera. In the zoom lens frame for performing the above, the female helicoid screw provided on the inner peripheral surface of the rotating tubular member and the linear helicoid screw connected to the tubular member and arranged on the upper stage thereof and obtained by metal injection molding A zoom lens frame, characterized in that a male helicoid screw provided on the outer peripheral surface of a plate-like portion that defines the direction in which the lens advances straight is helicoid-fitted. 4. A zoom lens frame which has a double structure of a rotating cylinder member and a rectilinear frame which is arranged inside thereof and which advances straight, and which is connected in multiple stages to perform an operation of extending and retracting with respect to a fixed cylinder. In a zoom camera equipped with, a rotatable tubular member provided with a female helicoid screw on an inner peripheral surface thereof, and a plate connected to the tubular member, arranged on a step above the tubular member, and formed so as to determine the straight traveling direction. A straight advancing frame provided with a male helicoid screw on the outer peripheral surface of the cylindrical portion, and the female helicoid screw of the tubular member and the male helicoid screw of the plate-shaped portion of the rectilinear frame are helicoidally fitted. Zoom camera. 5. A zoom lens frame which has a double structure of a rotating cylinder member and a rectilinear frame which is arranged inside thereof and which advances straight ahead, is connected in multiple stages, and is operated to extend and retract with respect to a fixed barrel. A zoom camera including: a zoom camera, wherein at least one of the rectilinear frames is made of a metal injection molding member. 6. A zoom lens frame which has a double structure of a rotating cylinder member and a rectilinear frame which is arranged inside thereof and which advances straight, and which is connected in multiple stages to perform an operation of extending and retracting with respect to a fixed cylinder. In a zoom camera provided with, a rotatable tubular member having an internal peripheral surface provided with a female helicoid screw, and a frame member formed by metal injection molding, which is connected to the tubular member and is provided on a step above it. And a straight advancing frame in which a male helicoid screw is provided on the outer peripheral surface of the plate-shaped portion formed so as to determine the direction in which the rectilinear movement is performed, and the female helicoid screw of the tubular member and the plate-shaped portion of the rectilinear frame. A zoom camera characterized by a helicoid fit with a male helicoid screw.