JP2000089282A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the extending amount of a lens barrel from being changed even though the leading end of the lens barrel in an extending condition touches something and some what external force is applied to the leading end of the lens barrel by providing a camera with a flat part extending in the direction perpendicular to the optical axis direction on a part where the movable barrel assembling body of a cam groove is controlled in the extending condition. SOLUTION: This camera is provided with a flat part extending in the direction perpendicular to the optical axis direction on a part where a movable barrel assembling body of a cam groove is controlled in the extending condition. That is, the camera is provided with the flat part extending perpendicularly to the optical axis direction at the position equivalent to the extending condition on the cam groove 1a formed on a fixed cam 1 and either of two steps formed at the position equivalent to the extending condition on the cam groove 3c formed on a rear part barrel 3 has a flat shape extending in the optical axis direction. Thus, the extending amount of a lens barrel is prevented from being changed even through the leading end of the lens barrel is carelessly pressed in the state that the lens barrel is extended to either extending position for close distance photographing or for long distance photographing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera having a plurality of mechanisms driven by an electric motor capable of rotating forward and backward, including a lens barrel driving mechanism for extending and retracting a lens barrel.

[0002]

2. Description of the Related Art Conventionally, cameras equipped with various mechanisms, such as a lens barrel extension, a collapsible mechanism, a focus adjusting mechanism, a film feeding mechanism, and a film developing and discharging mechanism in an instant photographic camera, are known. Has been
Some cameras incorporating these mechanisms further include a built-in electric motor, and the electric motor drives these mechanisms.

Here, in a camera equipped with such an electric motor, the idea of driving different mechanisms by switching the rotation direction of one electric motor in order to reduce the number of electric motors has conventionally been proposed. Are known. For example, according to Japanese Utility Model Registration No. 1869801, a single electric motor is used, and the wide-angle / telephoto switching drive of the lens barrel is performed by rotating the electric motor in one direction, and rotating in the other direction. Discloses a technique for driving another mechanism, for example, a film feeding mechanism or a shutter setting mechanism. Also, Japanese Patent Application Laid-Open No. 9-236
Japanese Unexamined Patent Publication No. 854 discloses a technique of rotating a single electric motor in one direction to feed, wind, and rewind a film, and rotating the electric motor in another direction to operate a different mechanism. Have been.

[0004]

The ideas disclosed in the above publications all drive different mechanisms in accordance with the rotation direction of one electric motor. It only proposes an object to be driven, such as driving a lens mechanism in a certain rotation direction or driving a mechanism such as film feeding, and in the case where the switching drive mechanism is specifically implemented. It does not give any hints about solving the problem.

For example, in the case of a camera provided with a lens barrel of a retractable and collapsible type, which is configured such that one electric motor drives the lens barrel by forward rotation and drives another mechanism by reverse rotation. After the lens barrel is extended and the lens barrel is extended, the mechanism for driving the lens barrel is disengaged from the electric motor while the electric motor is rotating and the other mechanism is operating. When the lens barrel tip extended while the lens barrel is in contact with something and the lens barrel is pushed toward the camera body, the extension of the lens barrel may change, However, there is a risk that improper shooting will be performed, but from the viewpoint of how to prevent the amount of extension from changing even if some external force is applied to the lens barrel in the extended state, or , With rotation of the electric motor in only one direction, There is no suggestion in the above publications regarding the viewpoint of how to realize both the operation of feeding and collapsing in the opposite direction of the operation while preventing the change of the feeding amount as described above. Not shown.

In view of the above circumstances, the present invention realizes both the extension and retraction of the lens barrel by rotating the electric motor in only one direction, and the tip of the lens barrel in the extended state is provided. It is an object of the present invention to provide a camera provided with a lens collapsing mechanism having a mechanism in which a feeding amount is prevented from being changed even when a slight external force is applied by touching the lens.

[0007]

According to the first aspect of the present invention, there is provided a camera comprising: a camera body, a retracted state extended forward of a photographing optical axis, and a collapsed state retracted rearward of a photographing optical axis. A movable cylinder assembly that supports the taking lens, is movable between the two, a rotating ring that rotates in one direction with respect to the camera body around the taking optical axis, and the movable cylinder assembly is rotated by rotating the rotating ring. A driving cylinder assembly provided with a part of a first cam mechanism for reciprocating between a retracted state and a retracted state, wherein the first cam mechanism includes a driving cylinder assembly and a moving cylinder assembly; One of them,
A flat surface extending in the direction perpendicular to the optical axis direction at a portion that regulates the movable cylinder assembly in the extended state while having a shape that advances and retreats at least once in the optical axis direction during one rotation of the imaging optical axis and during one rotation. An endless first cam groove having a portion, and the first cam groove provided on the other of the driving cylinder assembly and the moving cylinder assembly.
And a first cam pin slidably engaged with the cam groove.

The first camera according to the present invention comprises an endless first cam groove which goes around the photographing optical axis once, and which advances and retreats at least once in the direction of the optical axis during one turn, and the first cam groove. And a first cam pin slidably engaged with the camera lens. The rotation of the rotating ring in one direction causes the action of the first cam mechanism to cause the taking lens to rotate. Can be reciprocated between the extended state and the retracted state.

Here, since the first cam groove has a flat portion extending in a direction perpendicular to the optical axis direction in a portion for regulating the movable cylinder assembly to the extended state, the movable cylinder assembly is in the extended state. Even if the lens barrel optical axis is pushed by external force at one time,
The movement of the movable cylinder assembly toward the camera body due to the presence of the flat portion, that is, the change in the amount of extension is prevented.

A second camera of the present invention that achieves the above object moves between the camera body and a retracted state in which it is extended forwardly of the photographing optical axis and a retracted state in which it is collapsed rearward of the photographing optical axis. A movable cylinder assembly that freely supports the photographing lens, a rotating ring that rotates in one direction with respect to the camera body around the photographing optical axis, and the movable cylinder assembly is extended and retracted by rotating the rotating ring. A driving cylinder assembly provided with a part of a first cam mechanism that reciprocates between the first and second states. The first cam mechanism is mounted on one of the driving cylinder assembly and the moving cylinder assembly. The moving cylinder assembly is provided at a portion that makes a round around the photographing optical axis and advances and retreats at least once in the optical axis direction during one round, and regulates the moving cylinder assembly to the extended state. Multiple feeding positions with different feeding amounts An endless first cam groove having a plurality of steps each extending in a direction perpendicular to the optical axis direction, so as to be able to stop freely, and the other of the driving cylinder assembly and the moving cylinder assembly And a first cam pin slidably engaged with the first cam groove.

According to a second camera of the present invention, an endless cam groove which advances and retreats at least once in the optical axis direction is provided in one of the driving cylinder assembly and the moving cylinder assembly. In addition to the above, the other assembly is provided with a cam pin that engages with the cam groove thereof. By rotating the rotating ring in one direction, the movable cylinder assembly is moved between the extended state and the collapsed state. Can be reciprocated.

Further, in the second camera of the present invention, the first camera
Is a cam groove having a plurality of steps for enabling the movable cylinder assembly to be freely stopped at any of the plurality of extended positions, so that the movable cylinder assembly is positioned at a plurality of positions having different extended amounts. Can be stopped. That is, since the movable barrel assembly supports the taking lens,
The photographing lens can be adjusted to a plurality of focus positions. Therefore, in the second camera of the present invention, the rotating ring is rotated only in one direction, so that not only the moving cylinder assembly is reciprocated between the extended state and the retracted state, but also the focus is adjusted. be able to. Therefore, when the second camera of the present invention incorporates an electric motor for rotating the rotating ring, both the extension and the collapsing of the movable barrel assembly,
Further, the focus switching is performed only by the forward rotation of the electric motor, and the reverse rotation of the electric motor can be used for driving another mechanism (for example, a film feeding mechanism).

Further, in the second camera of the present invention,
Since each of the plurality of steps of the first cam groove has a shape extending perpendicularly to the optical axis direction, similar to the case of the first camera, when the movable barrel assembly is in the extended state. Even if the front end of the lens barrel is pushed by an external force, the amount of extension of the movable barrel assembly is prevented from changing.

Here, in the first camera or the second camera, it is preferable that the driving cylinder assembly has the first cam groove and the moving cylinder assembly has the first cam pin.

The driving cylinder assembly may be provided with a cam pin and the moving cylinder assembly may be provided with a cam groove. Conversely, if the driving cylinder assembly is provided with a cam groove and the moving cylinder assembly is provided with a cam pin. A mechanism for extending and retracting the movable cylinder assembly can be realized relatively easily.

Here, in the first camera of the present invention,
The moving cylinder assembly is connected to the rear cylinder assembly via the first cam mechanism and connected to the drive cylinder assembly, and is connected to the rear cylinder assembly via a predetermined second cam mechanism. Second
By the cam mechanism, when the rear cylinder assembly is extended forward in the optical axis direction, the rear cylinder assembly is further extended with respect to the rear cylinder assembly,
A front cylinder assembly that supports the taking lens and that retracts with respect to the rear cylinder assembly when the rear cylinder assembly retracts rearward in the optical axis direction, wherein the first cam mechanism includes a driving cylinder assembly and The rear cylinder assembly has a shape provided on one of the rear cylinder assemblies, which has a shape that makes one round around the photographing optical axis, advances and retreats at least once in the optical axis direction during one revolution, and regulates the rear cylinder assembly to the extended state. An endless first cam groove having a flat portion extending in a direction perpendicular to the optical axis direction in a portion thereof, and the first cam groove provided on the other of the drive cylinder assembly and the rear cylinder assembly. A first cam pin slidably engaged with the first cam pin, wherein the second cam mechanism is provided on one of the rear cylinder assembly and the front cylinder assembly, and extends around the imaging optical axis. It has a shape that advances and retracts at least once in the direction of the optical axis, and regulates the front cylinder assembly to the extended state. An endless second cam groove having a flat portion extending in a direction perpendicular to the optical axis direction in a portion to be formed, and the second cam provided on the other of the rear cylinder assembly and the front cylinder assembly A second cam pin slidably engaged with the groove may be provided.

Further, in the second camera of the present invention, the moving cylinder assembly includes a rear cylinder assembly connected to the driving cylinder assembly via the first cam mechanism, and a predetermined second cam. The rear cylinder assembly is connected to the rear cylinder assembly via a mechanism, and is further extended with respect to the rear cylinder assembly by the second cam mechanism when the rear cylinder assembly is extended forward in the optical axis direction. A front cylinder assembly that supports the taking lens and retracts with respect to the rear cylinder assembly when retracted rearward in the optical axis direction, wherein the first cam mechanism includes a drive cylinder assembly and The rear cylinder assembly has a shape provided on one of the rear cylinder assemblies, which has a shape that makes one round around the photographing optical axis, advances and retreats at least once in the optical axis direction during one revolution, and regulates the rear cylinder assembly to the extended state. In some parts, the rear cylinder assembly has multiple feeding positions with different feeding amounts An endless first cam groove having a plurality of steps each extending in a direction perpendicular to the optical axis direction, and a driving cylinder assembly and a rear cylinder assembly. A first cam pin slidably engaged with the first cam groove provided on the other side, wherein the second cam mechanism includes one of a rear cylinder assembly and a front cylinder assembly. And has a shape that advances one or more times in the optical axis direction and retreats in the optical axis direction at least once during one rotation, and wherein the first cam pin is engaged with any one of the plurality of stages. Even when the first cam groove is in contact with the rear cylinder assembly, the light corresponding to the entirety of the plurality of steps of the first cam groove is kept at the same position in the optical axis direction relative to the rear cylinder assembly. An endless second cam groove having a flat portion whose groove extends in a direction perpendicular to the axial direction, a rear cylinder assembly and a front part Provided on the other of the assemblies may be one and a second cam pin slidably engaged with the second cam groove.

Alternatively, in the second camera according to the present invention, the movable barrel assembly may include a rear barrel assembly connected to the drive barrel assembly via the first cam mechanism, and a predetermined second barrel.
The cam mechanism is connected to the rear cylinder assembly, and the second cam mechanism further extends the rear cylinder assembly when the rear cylinder assembly is extended forward in the optical axis direction. A front cylinder assembly for supporting a photographing lens, wherein the front cylinder assembly retracts with respect to the rear cylinder assembly when the solid is retracted rearward in the optical axis direction. It has a shape provided on one of the three-dimensional body and the front cylinder assembly, which goes around the photographing optical axis, moves forward and backwards at least once in the optical axis direction during one revolution, and extends the front cylinder assembly. A plurality of steps, each extending in a direction perpendicular to the optical axis direction, for allowing the front cylinder assembly to freely stop at any of a plurality of dispensing positions where the dispensing amount is different from each other, are provided in the portion that regulates the state. Endless second cam groove, rear cylinder assembly and front cylinder assembly Among provided in the other, and a second cam pin slidably engaged into the second cam groove,
The first cam mechanism is provided on one of the driving cylinder assembly and the rear cylinder assembly, and has a shape in which the first cam mechanism makes a round around the photographing optical axis and advances and retreats at least once in the optical axis direction during one round. And a plurality of second cam grooves such that the rear cylinder assembly maintains the same position in the optical axis direction even when the second cam pin is engaged with any of the plurality of steps. An endless first cam groove having a flat portion in which a groove extends in a direction perpendicular to the optical axis direction, at a portion corresponding to the entire region of the step, and provided at the other of the drive cylinder assembly and the rear cylinder assembly. And a first cam pin slidably engaged with the first cam groove.

Further, in the second camera of the present invention, the movable barrel assembly is connected to the drive barrel assembly via the first cam mechanism, and the second barrel is provided with a predetermined second barrel.
The cam mechanism is connected to the rear cylinder assembly, and the second cam mechanism further extends the rear cylinder assembly when the rear cylinder assembly is extended forward in the optical axis direction. A front cylinder assembly for supporting the taking lens, wherein the front cam mechanism is configured to be retracted with respect to the rear cylinder assembly when the three-dimensional body is retracted rearward in the optical axis direction. A part provided on one of the three-dimensional body and the rear cylinder assembly, which makes one revolution around the photographing optical axis, moves forward and backwards at least once in the optical axis direction during one revolution, and regulates the rear cylinder assembly to the extended state. An endless first end having a plurality of steps each extending in a direction perpendicular to the optical axis direction so that the rear cylinder assembly can be stopped at any of a plurality of feeding positions having different feeding amounts. And the other of the drive cylinder assembly and the rear cylinder assembly It provided with, a first cam pin slidably engaged with the first cam groove, the second
The cam mechanism is provided on one of the rear cylinder assembly and the front cylinder assembly. The part for regulating the cylinder assembly to the extended state is provided with a front cylinder assembly that can be stopped at any of a plurality of extension positions where the relative extension amount with respect to the rear cylinder assembly is different from each other. An endless second cam groove having a plurality of steps extending in a direction perpendicular to the optical axis direction, and the second cam groove provided on the other of the rear cylinder assembly and the front cylinder assembly And a second cam pin slidably engaged with the second cam pin.

The moving cylinder assembly is divided into a rear cylinder assembly and a front cylinder assembly connected to each other with a second cam mechanism interposed therebetween, and the rear cylinder assembly constituting the moving cylinder assembly is divided into a second cylinder assembly and a second cylinder assembly. 1
When the rotating ring is rotated in one direction, both the rear cylinder assembly and the front cylinder assembly are extended and collapsible by rotating the rotating ring in one direction. A retractable camera is configured. Specifically, for example, one of the drive cylinder assembly and the rear cylinder assembly is provided with a first cam groove which advances and retreats at least once in the optical axis direction and the other cam groove. Of the assembly,
A first cam pin engaged with the cam groove;
A second member that moves forward and backward at least once in the optical axis direction to one of the rear tube assembly and the front tube assembly.
When the other assembly is provided with a second cam pin that engages with the cam groove, by rotating the rotating ring in one direction, the rear cylinder assembly and the front cylinder assembly are provided. And both collapsing and collapsing can be realized.

Here, in the first camera, the first cam groove has a flat portion extending in a direction perpendicular to the optical axis direction at a portion for regulating the rear cylinder assembly to the extended state, and the second cam groove has a second portion. Similarly, the cam groove has a flat portion extending in a direction perpendicular to the optical axis direction in a portion that regulates the front cylinder assembly in the extended state, so that the lens barrel (the rear cylinder assembly and the front cylinder In both cases, when the front end of the lens barrel collides with something and the lens barrel is pushed, the amount of extension of the lens barrel is prevented from changing.

In the second camera, a plurality of steps are provided in one or both of the first cam groove and the second cam groove, and each of the plurality of steps extends in a direction perpendicular to the optical axis direction. A cam groove having a shape and not including a plurality of steps has a flat portion extending in a direction perpendicular to the optical axis direction at a portion corresponding to the plurality of steps. Therefore, when the lens barrel (both the moving barrel assembly and the front barrel assembly) is in the extended state,
Even if it has been extended to any of a plurality of extension positions corresponding to a plurality of stages, even if the lens barrel tip hits something and the lens barrel is pushed,
A change in the extension of the lens barrel is prevented.

In either of the first camera and the second camera, in the case of the camera having the above-mentioned two-stage collapsible lens barrel, the movable barrel assembly has the first cam groove. Preferably, the rear cylinder assembly has a first cam pin and a second cam groove, and the front cylinder assembly has a second cam pin.

By providing the first and second cam grooves and the first and second cam pins in the respective assemblies described herein, the front cylinder assembly and the rear cylinder assembly are extended and retracted. The mechanism can be easily configured.

[0025]

Embodiments of the present invention will be described below.

FIG. 1 is a front view showing a camera according to a first embodiment of the present invention.

As shown in FIG. 1, the camera 50 has a camera body 51 having a shutter button 53 and the like, and a lens barrel 52 is attached to the front of the camera body 51. The camera body 51 incorporates an electric motor 54 that rotates freely forward and backward. Further, an AF window 55 is provided in the camera body 51, and an AF sensor (not shown) for measuring a distance to a subject is arranged inside the AF window 55. When the shutter button 53 is half-pressed, the camera 50
Distance measurement is performed by the F sensor, and photographing is performed when fully pressed.

FIG. 2 is a longitudinal sectional view of the lens barrel in the optical axis direction when the lens barrel of the camera is in a collapsed state.
Is when the lens barrel of the camera is in the extended state,
FIG. 3 is a longitudinal sectional view of the lens barrel in an optical axis direction.

The lens barrel 52 has, as main components,
As shown in FIG. 2, a front barrel 5 having a built-in lens shutter set 6, a rear barrel 3 for storing the front barrel 5 in a collapsed state, a collapse drive ring 2, a fixed cam barrel 1, and the like are provided. . The fixed cam barrel 1 is a camera body 51 (see FIG. 1).
The fixed cam barrel 1 has a cam groove 1a on its inner wall surface and three key grooves 1b extending in the optical axis direction.
(FIGS. 2 and 3 show three keyways 1b).
Only one keyway 1b is shown). The detailed shape of the cam groove 1a will be described later. The lens barrel 52 has a retractable drive ring 2 covered with a lens barrel cover 10. The retractable drive ring 2 does not move in the optical axis direction at a position surrounding the outer wall of the fixed cam barrel 1,
And it is attached rotatably around the optical axis.
At the rear end of the outer wall of the retractable drive ring 2, a camera body 5 is provided.
1 is formed with a driving gear 2a to which a driving force of an electric motor 54 (see FIG. 1) disposed inside is transmitted. The driving force of the electric motor 54 is the driving gear 2 of the collapsed driving ring 2.
When a is transmitted, the retractable drive ring 2 rotates about the optical axis. On the inner wall surface of the retractable drive ring 2, three drive grooves 2b extending in the optical axis direction are formed (in FIGS. 2 and 3, one of the three drive grooves 2b is a drive groove 2b). Only these are shown), these three drive grooves 2b are provided at 120 degree intervals about the optical axis. On a rear outer wall of the rear cylinder 3, three connecting pins 3a slidably engaged with the drive grooves 2b of the retractable drive ring 2;
Three cam pins 3b slidably engaged with the cam grooves 1a of the fixed cam barrel 1 are provided (see FIGS. 2 and 3 as 3).
Only one cam pin 3b of the three cam pins 3b is shown, and one connection pin 3a of the three connection pins 3a.
Only shown). The three connecting pins 3a are provided at 120-degree intervals around the optical axis, and the three cam pins 3b are also provided at 120-degree intervals around the optical axis. A cam groove 3c is formed on the inner wall surface of the rear cylinder 3. The detailed shape of the cam groove 3c will be described later. Further, a straight key ring 4 is provided in the rear cylinder 3.
However, it is arranged in a state where the movement in the optical axis direction with respect to the rear barrel 3 is prohibited. Three key pins 4a are provided on the rear end outer wall of the straight key ring 4 (FIGS. 2 and 3).
Has one of the three key pins 4a
Only are shown), these three key pins 4a
Each is slidably engaged with each of the three key grooves 1b of the fixed cam barrel 1. The cam groove 1a of the fixed cam cylinder 1
The cam mechanism for extending and retracting the rear cylinder 3 and the linear key ring 4 includes the key groove 1b, the driving groove 2b of the collapsible driving ring 2, the connecting pin 3a and the cam pin 3b of the rear cylinder 3, and the key pin 4a of the linear key ring 4. Is composed.
The manner in which the rear barrel 3 and the straight key ring 4 are extended and retracted will be described later.

A lens cover opening / closing member 8 for opening and closing the lens cover is fixed in the front tube 5, and a linear guide groove 4 b of the straight key ring 4 is provided at the rear end of the lens cover opening / closing member 8. A guide pin 8a is provided to enter. Further, three cam pins 5a penetrating the straight key ring 4 and slidably engaging with the cam grooves 3c of the rear cylinder 3 are provided on the outer periphery of the rear end of the front cylinder 5 (FIG. 2). 3 shows only one of the three cam pins 5a). These three cam pins 5a are provided at intervals of 120 degrees in the circumferential direction around the optical axis. Cam pin 5a of front tube 5, guide pin 8a of lens cover opening / closing member 8, cam groove 3 of rear tube 3
c and the rectilinear guide groove 4b of the rectilinear key ring 4 constitute a cam mechanism for extending and retracting the front tube 5 in the optical axis direction in a straight line. In addition, the linear key ring 4, the rear barrel 3, the front barrel 5, and the movement of the front barrel 5 in the optical axis direction are regulated.
The one including various members such as the lens shutter set 6 which moves in the optical axis direction together with the front cylinder 5 along with the collapse corresponds to the moving cylinder assembly according to the present invention. The retractable drive ring 2 including the fixed cam barrel 1 corresponds to the drive barrel assembly according to the present invention.

The manner in which the rear barrel 3 and the front barrel 5 are extended in the optical axis direction and collapsed when the retractable drive ring 2 rotates will be described below with reference to FIGS. .

FIG. 4 is a view showing the inner wall surfaces of the fixed cam barrel and the rear barrel developed in a direction perpendicular to the optical axis direction. However, the abscissa indicates not the actual size ratio of the inner wall surface but the angle around the optical axis.

The rear cylinder 3 is formed with a cam groove 3c with which the three cam pins 5a of the front cylinder 5 (see, for example, FIG. 3) are engaged. This cam groove 3c is an endless cam groove which repeats forward and backward in the optical axis direction three times during one rotation of the photographing optical axis and during one rotation. This cam groove 3c is a portion passing through the front in the optical axis direction. It has two steps 3d. These two stages 3d are:
Each of them has a flat shape extending in a direction perpendicular to the optical axis direction.

On the other hand, the fixed cam barrel 1 has a cam groove 1 with which three cam pins 3b (for example, see FIG. 3) of the rear barrel 3 engage.
a is formed. The cam groove 1a is an endless cam groove which repeats forward and backward three times in the direction of the optical axis during one rotation of the photographing optical axis, and two cam grooves 3c of the rear cylinder 3 are formed. A flat portion 1c extending in a direction perpendicular to the optical axis direction is provided in a portion corresponding to the entire area of the three steps 3d. A key groove 1b extending in the optical axis direction is formed behind the flat portion 1c of the fixed cam cylinder 1 in the cam groove 1a.

Here, the method of detecting the position of the lens barrel will be described once, and then the description will return to the description of the extending and retracting operation.

FIG. 5 is a front view of the retractable drive ring and the retractable switch lever.

A drive gear 2a is formed at the rear end of the outer wall of the retractable drive ring 2, and a cam surface 2c is formed all around the front side of the outer wall. The cam surface 2c is formed at different heights depending on the extended state, the retracted state, and the intermediate state between the extended state and the retracted state of both the rear cylinder 3 and the front cylinder 5. Have been. That is, the cam surface 2c
Has an area A corresponding to the extended state, an area C corresponding to the retracted state, and an area B corresponding to an intermediate state between the extended state and the retracted state. Here, the extended state of the front cylinder 5 includes
There are a first feeding position and a second feeding position with different feeding amounts, and the area A of the cam surface 2c corresponding to the feeding state is formed at different heights according to the two positions with different feeding amounts. An area A1 corresponding to the first feeding position;
And a region A2 corresponding to the second feeding position. Therefore, the cam surface 2c has four regions A1, A2, B, and C formed at different heights. These four regions A1, A2, B, and C are formed on the cam surface 2c in regions divided into three in the circumferential direction of the optical axis. The retractable switch lever 11 is in contact with the cam surface 2c.
The height of the portion in contact with the retractable switch lever 11 changes, and the retractable switch lever 11 rotates in the arrow Y direction.
At this time, the state of the contact that contacts the retractable switch lever 11 changes, and depending on the state of the contact, the retractable switch lever 11 moves the cam surface 2c to areas A1, A2, B, and C formed at different heights. Of the rear cylinder 3 and the front cylinder 5 and the focus position are recognized.

In FIG. 4, three cam pins 3b (see, for example, FIG. 2) of the rear barrel 3 are respectively located at three collapse positions A of the cam groove 1a of the fixed cam barrel 1, and When the three cam pins 5a (see, for example, FIG. 2) are respectively located at the three retracted positions D of the cam groove 3c of the rear cylinder 3, the rear cylinder 3 and the front cylinder 5 are collapsed into the fixed cam cylinder 1. (See FIG. 2). At this time, the retractable switch lever 11 is in contact with the lowest portion A of the cam surface 2c of the retractable drive ring 2 as shown in FIG. Here, when the power of the camera body 51 is turned on,
The electric motor 54 rotates forward, and the retractable drive ring 2 rotates around the optical axis in the direction of arrow P (see FIG. 5). At this time, since the connecting pin 3a of the rear barrel 3 is engaged with the drive groove 2b (for example, see FIG. 2) of the retractable drive ring 2, the rear barrel 3 also rotates about the optical axis via the connecting pin 3a. I do. Here, since the three cam pins 3b of the rear barrel 3 are engaged with the cam grooves 1a of the fixed cam barrel 1, the three cam pins 3b are guided by the cam grooves 1a, and From A, the rear barrel 3 is moved toward the first delivery position B where the delivery amount of the rear barrel 3 is set to the maximum delivery quantity, and the rear barrel 3 is delivered. At this time, go straight key ring 4
Since the key pin 4a is engaged with the key groove 1b of the fixed cam cylinder 1, the key is fed straight as the rear cylinder 3 is fed while rotating. The cam pin 5a of the front cylinder 5 is engaged with the cam groove 3c of the rear cylinder 3, and the guide pin 8a (see, for example, FIG. 2) of the lens cover opening / closing member 8 disposed in the front cylinder 5. Since the cam pins 5a of the front cylinder 5 are moved from the retracted position A toward the first extended position B, the cam pins 5a of the front cylinder 5 are inserted into the rectilinear guide grooves 4b of the rectilinear key ring 4. The front tube 5 is moved straight out of the retracted position D toward the first feeding position E. Three cam pins 3b of the rear cylinder 3 and three cam pins 5a of the front cylinder 5
Are moved toward the first extension positions B and E, respectively, and the retractable switch lever 11 is moved to the portions A1 and A2 of the cam surface 2c of the retractable drive ring having different heights.
It slides with the part B of 2, B and C.

In this embodiment, a short-distance photographing position is selected as an initial setting of the focal position of the lens shutter set when the power is turned on, and the retractable switch lever 11 is turned by rotating the retractable drive ring 2. Retractable drive ring 2
When the cam surface 2c contacts the portion A1 corresponding to the first feeding position, the rotation of the electric motor 54 stops, and the retractable drive ring 2 stops. At this time, the cam pins 3b of the rear cylinder 3 and the cam pins 5a of the front cylinder 5 are respectively
It stops at the first feeding positions B and E, and the feeding of the rear tube 3 and the front tube 5 stops. When the cam pins 3b of the rear barrel 3 and the cam pins 5a of the front barrel 5 stop at the first extended positions B and E, respectively, the focal point of the lens shutter set is set to a position for short-distance photography.

When the shutter button of the camera body is half-pressed, the AF sensor performs distance measurement. As a result of the distance measurement, when a long-distance shooting position is selected as the focal position of the lens shutter set, the motor is operated. The motor 54 rotates forward again, and the retractable switch lever 11 is
When the cam surface 2c contacts the portion A2 corresponding to the second feeding position, the rotation of the electric motor 54 stops, and the retractable drive ring 2 stops. At this time, the cam pin 3b of the rear barrel 3 stops at the second delivery position C located next to the first delivery position B, and the cam pin 5a of the front barrel 5
However, it stops at the second feeding position F that regulates the feeding amount of the front tube 5 to a slightly smaller feeding amount than the first feeding position E. When the cam pin 5a of the front tube 5 stops at the second extension position F, the focal point of the lens shutter set is set to a position for long-distance photography. Thus, this camera 5
0 indicates the front cylinder 5 according to the short-range shooting and the long-range shooting.
The focal position of the lens shutter set is adjusted by changing the feeding amount of the lens shutter in two stages.

Here, the cam groove 1a formed in the fixed cam cylinder 1 has a flat portion 1c extending perpendicular to the optical axis direction at a position corresponding to the extended state, and is formed in the rear cylinder 3. In the cam groove 3c, two steps 3d formed at positions corresponding to the extended state each have a flat shape extending in the optical axis direction. Even if the tip of the lens barrel is inadvertently pushed in the state where it is extended to any of the extension positions,
This prevents the amount of extension of the lens barrel from changing, and prevents inadvertent out-of-focus photography.

If the power of the camera is turned off while the lens barrel is in the extended state, before the power is actually turned off, the electric motor 54 rotates forward again and the retractable drive ring 2 further moves in the P direction. Rotate, the cam pin 3b of the rear cylinder 3
Moves from the first feeding position B or the second feeding position C toward the retracted position A, and the cam pin 5a of the front tube 5 is retracted from the first feeding position E or the second feeding position F. Move toward position D. At this time, the retractable switch lever 11 is moved to the cam surface 2 c of the retractable drive ring 2.
, Slides with a portion B corresponding to an intermediate state between the extended state and the retracted state. When the retractable drive ring 2 is further rotated, the retractable lever switch 11 is moved to the cam surface 2c.
Contacting the portion C corresponding to the retracted state, the rotation of the electric motor 54 stops, and the retractable drive ring 2 stops.
At this time, the cam pins 3b of the rear cylinder 3 and the cam pins 5a of the front cylinder 5 reach the collapse positions A and D, respectively, and the collapse of the rear cylinder 3 and the front cylinder 5 is completed.

When the focus of the lens shutter set is set at a position for long-distance photography, the shutter button is half-pressed, and when a short distance is obtained as a result of distance measurement by the AF sensor, the electric motor 54 is turned off. After normal rotation, the rear cylinder 3 and the front cylinder 5 are once again extended through the retracted state, and set to the extended position for short-range photographing.

A lens cover assembly 7 is attached to the front cylinder 5 on the front surface of the lens shutter assembly 6 so as to be openable and closable, and an opening 9 is further provided on the front surface of the lens cover assembly 7.
The decoration nameplate 9 having a is attached. The lens cover assembly 7 is controlled by a lens cover opening / closing member 8 so as to open when the front tube 5 is extended and close when the front tube 5 is retracted.

As described above, the camera 50 performs the extension and retraction of the rear cylinder 3 and the front cylinder 5 only by being rotated forward by the electric motor 54, and also adjusts the focus. The camera 50 includes a planetary mechanism (not shown) that switches the transmission destination of the driving force of the electric motor 54 in accordance with the forward or reverse rotation of the electric motor 54. In the camera 50, the planetary mechanism transmits the driving force of the electric motor 54 to the retractable drive ring 2 when the electric motor 54 is rotating forward, and the electric motor when the electric motor 54 is rotating reversely. 54 is transmitted to a film feeding mechanism (not shown). As described above, in the camera 50, one electric motor 54 is used as a drive source for extending and retracting the lens barrel, and also used as a drive source for the film feeding mechanism. In a conventional camera in which the taking lens is extended and retracted in accordance with the forward and reverse rotations of the electric motor, another electric motor is required to drive the film feeding mechanism. However, the camera 50 shown in FIG. Does not require a separate electric motor for driving the film feeding mechanism, and the camera is reduced in size and cost. Further, in the camera 50, the cam groove 3c formed in the rear cylinder 3 can stop the front cylinder 5 at any of the first extension position E and the second extension position F having different extension amounts. Focus adjustment depending on whether the cam pin 5a of the front tube 5 stops at one of the first and second feeding positions E and F. Is performed. Therefore, the camera 50 can perform focus adjustment without a dedicated member for performing focus adjustment.

Further, each of the flat portion 1c of the cam groove 1a of the fixed cam cylinder 1 and the two steps 1d of the cam groove 3c of the rear cylinder 3 are flat and extend in the direction perpendicular to the optical axis direction. Since it is formed in the shape, even if the tip of the lens barrel in the extended state is pressed carelessly, the extension position is prevented from changing.

Here, the fixed cam barrel 1 has a cam groove 1a.
And a drive groove 2b in the retractable drive ring 2 and a connecting pin 3a and a cam pin 3b in the rear barrel 3 and a key pin 4a in the straight key ring 4 to provide the rear barrel 3 and the straight The key ring 4 is extended and collapsed, but on the contrary,
A pin may be provided on the fixed cam barrel 1 and the retractable drive ring 2, while a groove on which the pin slides may be provided on the rear barrel 3 and the straight key ring 4, so that the rear barrel 3 may be extended and collapsed. Also, by providing the rear barrel 3 with the cam groove 3c and the straight key ring 4 with the straight guide groove 4b, the front barrel 5 with the cam pin 5a and the lens cover opening / closing member 8 with the guide pin 8, Although the barrel 5 is extended straight out in the optical axis direction and collapsed,
Conversely, the rear barrel 3 and the straight key ring 4 are provided with pins, while the front barrel 5 and the lens cover opening / closing member 8 are provided.
The front cylinder 5 is provided with a groove in which the pin slides.
May be fed straight in the optical axis direction and collapsed.

Next, a camera according to a second embodiment of the present invention will be described. The camera of the second embodiment will be described with reference to FIG. 6 only for the differences from the camera of the first embodiment.

FIG. 6 is a view showing a part when the fixed cam barrel and the rear barrel provided in the camera of the second embodiment are developed in the circumferential direction. FIG. 6 shows one divided portion of each of the fixed cam cylinder and the rear cylinder divided into three in the circumferential direction.

In the camera of the second embodiment, the cam groove 1a formed in the fixed cam cylinder 1 has two steps 1d, and the cam groove 3c formed in the rear cylinder 3 has a flat portion 3e. I have.

Each of these two steps 1d and the flat portion 3e have a flat shape extending in a direction perpendicular to the optical axis direction.

As described above, the cam groove having two steps is formed as follows.
Even when the fixed cam barrel 1 is formed instead of the rear barrel 3, the focus can be adjusted.

Further, since each of the two steps 1d and the flat portion 3e has a flat shape extending in the direction perpendicular to the optical axis direction, the lens barrel extends as in the above-described embodiment. In the state, even if a force is applied to the tip, the feeding amount is prevented from changing.

Next, a camera according to a third embodiment of the present invention will be described. Regarding the camera of the third embodiment,
With reference to FIG. 11, only differences from the camera of the above-described first embodiment will be described.

FIG. 7 is a view showing a part when the fixed cam barrel and the rear barrel provided in the camera of the third embodiment are expanded in the circumferential direction. FIG. 7 shows one divided portion of each of the fixed cam cylinder and the rear cylinder divided into three in the circumferential direction.

In the camera according to the third embodiment, the cam groove 1a of the fixed cam barrel 1 connects the rear barrel 3 to the first feeding position and the second feeding position where the relative feeding amounts to the fixed cam barrel 1 are different from each other. It has two steps 1c for making it possible to stop at any of the feeding positions, and the rear tube 3 also has two steps 2d. Each of these two steps 1c and each of the two steps 1d have a flat shape extending in a direction perpendicular to the optical axis direction.

Each of these cam grooves 1a, 3c has two steps 1c, 3d. By combining the two steps 1c, 3d of the cam grooves 1a, 3c, the areas A, 3c are formed. In the three regions B and C, the feed amount of the front tube 5 can be made different, so that finer focus adjustment can be performed. In addition, since each of the two steps 1c and 1d has a flat shape extending in a direction perpendicular to the optical axis direction, each of the two steps 1c and 1d has the same lens mirror as in the above-described embodiments. Even when a force is applied to the tip of the trunk in the extended state, the amount of extension is prevented from changing.

Next, a camera according to a fourth embodiment of the present invention will be described.

FIG. 8 is a longitudinal sectional view of the lens barrel provided in the camera of the fourth embodiment in the optical axis direction when the movable barrel is in the collapsed state. FIG. 9 is a view of the fourth embodiment. FIG. 4 is a longitudinal sectional view of a lens barrel provided in the camera in a direction of an optical axis when a movable barrel is in an extended state. In describing the camera of the fourth embodiment, FIGS.
This will be described with reference to FIG. Here, the description will be made assuming that the camera 50 shown in FIG. 1 is the camera of the fourth embodiment having the structure shown in FIGS.

As shown in FIG. 1, the camera 50 of the fourth embodiment has a camera body 51 having a shutter button 53 and the like, and a lens barrel 52 is attached to the front of the camera body 51. . The camera body 51 incorporates an electric motor 54 that rotates freely forward and backward. Further, an AF window 55 is provided in the camera body 51, and an AF sensor (not shown) for outputting a distance to a subject is arranged inside the AF window 55. In the camera 50, when the shutter button 53 is half-pressed, distance measurement is performed by the AF sensor, and when the shutter button 53 is fully pressed, photographing is performed.

As shown in FIG. 8, the lens barrel 52 includes, as shown in FIG. 8, a fixed barrel 12 mounted and fixed to a camera body 51, a retractable drive ring 13, and a movable barrel 14 incorporating a lens shutter set 6. And Fixed cylinder 1
2 is an inner cylinder 12a and an outer cylinder 1 surrounding the inner cylinder 12a.
2b. Two straight guide grooves 12c extending in the optical axis direction are formed in the inner cylinder 12a. A retractable drive ring 13 enters between the inner cylinder 12a and the outer cylinder 12b of the fixed cylinder 12 in a state where movement in the optical axis direction is prohibited. At the rear end of the outer wall of the retractable drive ring 13, an electric motor 54 disposed inside the camera body 51 is provided.
A driving gear 13a to which the driving force (see FIG. 1) is transmitted is formed. When the driving force of the electric motor 54 is transmitted to the driving gear 13a of the retractable driving ring 13 via the transmission gear 15, the driving gear 13a is The retractable drive ring 13 rotates about the optical axis. A cam surface 13b is formed at the rear end of the outer wall of the retractable drive ring 13 where the drive gear 13a is formed. The cam surface 13b is formed at a different height according to the extended state of the movable barrel 14, the retracted state, and an intermediate state between the extended state and the retracted state. Here, the feeding state of the movable barrel 14 has two feeding positions with different feeding amounts as described later,
The portion of the cam surface 13b corresponding to the feeding state is formed at further different heights according to two feeding positions where the feeding amount is different. The inner bottom of the lens barrel 52 is in contact with the cam surface 13b,
, That is, a retractable switch lever 16 for recognizing the current state of the movable barrel 14 is disposed. A cam groove 13c is formed at the front end of the retractable drive ring 13. The detailed shape of the cam groove 13c will be described later.

The outer peripheral portion of the rear end of the movable barrel 14 is slidably engaged with a cam groove 13c formed in the collapsible drive ring 13 through the straight guide groove 12c of the inner barrel 12a of the fixed barrel 12. Two cam pins 14a are provided (FIGS. 8 and 9 show only one of the two cam pins 14a). These two cam pins 14a are provided at 180-degree intervals about the optical axis. The cam pin 14a of the movable barrel 14, the straight guide groove 12c of the inner barrel 12a of the fixed barrel 12, and the cam groove 13c of the retractable drive ring 13 constitute a cam mechanism for extending the movable barrel 14 straight in the optical axis direction and retracting. are doing. still,
In the present embodiment, the movement of the movable cylinder 14 and the movement of the movable cylinder 14 in the optical axis direction are restricted, and the movable cylinder 14 is moved in the optical axis direction together with the movable cylinder 14 when the movable cylinder 14 is extended and retracted. The moving cylinder assembly according to the present invention includes various members such as the lens shutter set 6 and the like. Also,
The retractable drive ring 13 including the fixed barrel 12 corresponds to the drive barrel assembly according to the present invention.

The following describes how the movable barrel 14 is extended in the optical axis direction and collapsed when the retractable drive ring 13 rotates, with reference to FIG.

FIG. 10 is a diagram showing the inner wall surface of the retractable drive ring developed in a direction perpendicular to the optical axis direction.

The cam groove 1 in which the retractable drive ring 13 is formed
Reference numeral 3c denotes an endless cam groove which repeats forward and backward in the direction of the optical axis twice during one round of the photographing optical axis and in one round. Has two steps 13d. Each of the two steps 13d has a flat shape extending in a direction perpendicular to the optical axis direction.

The cam pin 14a of the movable barrel 14 (for example, FIG.
Is located at the retracted position A, the moving cylinder 1
4 is retracted in the fixed cylinder 12. Here, the electric motor 5
When 4 rotates forward, the collapsed state ring 13 rotates in one direction,
While recognizing the current state of the movable barrel 14 with the retractable switch lever 16, the cam pin 14a of the movable barrel 14 first moves to the first extension position B corresponding to short-range shooting, and the movable barrel 14 is accordingly moved. It is paid out. When a long distance is measured by the AF sensor, the electric motor 54 rotates forward again, and the cam pin 14a of the moving barrel 14 moves to the second extension position C corresponding to the long-distance photographing. Is slightly returned in the retracting direction. Here, since each of the two steps 13d has a flat shape extending in the optical axis direction, even when the two steps 13d are extended to any of the extension positions for short-range photography or long-range photography. When the lens barrel is inadvertently pushed, this prevents the amount of extension of the lens barrel from changing, and prevents inadvertently out-of-focus photography. Is done.

With the lens barrel extended,
When the photographing is completed and the power is turned off, the electric motor 54 further rotates forward before the power is actually turned off, whereby the collapsible drive ring 13 rotates in the above one direction, and the cam pin of the movable barrel 14 is rotated. 14a moves to the collapse position A, and the movable barrel 14 collapses.

As described above, even with a single-stage retractable camera, the cam pin 14a of the movable barrel 14 is attached to the retractable drive ring 13.
By forming the cam groove 13c through which the moving cylinder 14 is rotated in one direction, the moving cylinder 14 is extended and retracted, and the focus is adjusted. Therefore, the size and cost of the camera can be reduced.
Further, since the two steps 13d of the cam groove 13c are both formed in a flat shape extending in a direction perpendicular to the optical axis direction, even if the lens barrel optical axis in the extended state is inadvertently pushed. A change in the feeding position is prevented.

In the various embodiments described above, the focus position is changed to a plurality of steps by devising the cam groove. However, in the present invention, the configuration for switching the focus position by devising the cam groove is not necessarily required. The present invention may be applied to a fixed focus type camera, or the focus may be adjusted by a configuration different from the configuration of the cam groove. When the present invention is applied to a fixed focus type camera, or when the present invention is applied to a camera configured to perform focus adjustment by a configuration different from the device of the cam groove, two stages 3 shown in FIG.
d, two stages 1d shown in FIG. 6, each two stages 1 shown in FIG.
c, 3d, or the two steps 13d shown in FIG. 10 are not two steps but one step, and are formed in a flat shape extending in a direction perpendicular to the optical axis direction.

[0070]

As described above, according to the camera of the present invention, both the extension and retraction of the lens barrel are realized by the rotation of the electric motor in only one direction, and the lens in the extended state is realized. Even if the tip of the lens barrel touches something or some external force is applied, it is possible to prevent the feeding amount from changing.

[Brief description of the drawings]

FIG. 1 is a front view showing a camera according to a first embodiment of the present invention.

FIG. 2 illustrates a state in which a rear barrel and a front barrel constituting a lens barrel of the camera according to the first embodiment of the present invention are in a collapsed state.
FIG. 3 is a longitudinal sectional view of the lens barrel in an optical axis direction.

FIG. 3 shows a state in which a rear barrel and a front barrel constituting a lens barrel of the camera according to the first embodiment of the present invention are in an extended state.
FIG. 3 is a longitudinal sectional view of the lens barrel in an optical axis direction.

FIG. 4 is a diagram showing inner wall surfaces of a fixed cam barrel and a rear barrel developed in a direction perpendicular to the optical axis direction.

FIG. 5 is a front view of a retractable drive ring and a retractable switch lever.

FIG. 6 is a view showing a part when a fixed cam barrel and a rear barrel included in the camera of the second embodiment are developed in a circumferential direction.

FIG. 7 is a view showing a part when a fixed cam barrel and a rear barrel included in the camera of the third embodiment are developed in a circumferential direction.

FIG. 8 is a longitudinal sectional view of a lens barrel provided in a camera according to a fourth embodiment in the optical axis direction when a movable barrel is in a collapsed state.

FIG. 9 is a longitudinal sectional view of a lens barrel included in a camera according to a fourth embodiment in the optical axis direction when a movable barrel is in an extended state.

FIG. 10 is a diagram showing the inner wall surface of the retractable drive ring developed in a direction perpendicular to the optical axis direction.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed cam cylinder 1a, 3c, 13c Cam groove 1b Key groove 1c, 3e Flat part 2, 13 Retractable drive ring 2a Drive gear 2b Drive groove 2c, 13b Cam surface 3 Rear cylinder 3a Connecting pin 3b, 5a, 14a Cam pin 1d, 3d, 13d Two steps 4 Straight key ring 4a Key pin 4b, 12c Straight guide groove 5 Front tube 6 Lens shutter set 7 Lens cover set 8 Lens cover opening / closing member 8a Guide pin 9 Decorative name plate 9a Opening 10 Lens barrel cover 11, 16 Collapse switch lever 12 Fixed cylinder 12a Inner cylinder 12b Outer cylinder 13a Driving gear 14 Moving cylinder 15 Transmission gear 50 Camera 51 Camera body 52 Lens barrel 53 Shutter button 54 Electric motor 55 AF window

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H044 BD06 BE02 BE06 BE08 BF03 DB02 DC01 DD03 DE07 EA05 EF05 2H101 BB07 BB10 BB20 DD06 DD07 DD22

Claims (8)

[Claims] 1. A camera body, a movable cylinder assembly supporting a photographing lens and movable between an extended state extended forward of a photographing optical axis and a retracted state collapsed rearward of the photographing optical axis. A rotating ring that rotates in one direction with respect to the camera body as a center, and a part of a first cam mechanism that reciprocates the movable cylinder assembly between the extended state and the retracted state by rotating the rotating ring; Wherein the first cam mechanism is provided on one of the drive cylinder assembly and the movable cylinder assembly, and rotates around a photographic optical axis. An endless first cam having a shape that advances and retreats one or more times in the axial direction and has a flat portion extending in a direction perpendicular to the optical axis direction in a portion that regulates the movable cylinder assembly in the extended state. A groove, the driving cylinder assembly and the moving cylinder assembly Provided on the other of the camera, characterized in that a first cam pin slidably engaging with the first cam groove. 2. A camera body, a movable cylinder assembly for supporting a photographing lens, which is movable between an extended state extended forward of a photographing optical axis and a retracted state collapsed rearward of the photographing optical axis, and a photographing optical axis. A rotating ring that rotates in one direction with respect to the camera body as a center, and a part of a first cam mechanism that reciprocates the movable cylinder assembly between the extended state and the retracted state by rotating the rotating ring; Is provided, and the first cam mechanism is provided on one of the drive cylinder assembly and the movable cylinder assembly. It has a shape that advances and retreats one or more times in the axial direction, and a portion that regulates the moving cylinder assembly in the extended state, and the movable cylinder assembly can be moved to any of a plurality of extending positions different in the extending amount from each other. Each is on the optical axis so that it can be stopped freely An endless first cam groove having a plurality of steps extending in a direction perpendicular to the first cam groove, and sliding on the first cam groove provided on the other of the driving cylinder assembly and the moving cylinder assembly. A camera comprising: a first cam pin movably engaged. 3. The camera according to claim 1, wherein the driving cylinder assembly includes the first cam groove, and the moving cylinder assembly includes the first cam pin. . 4. A rear cylinder assembly, wherein the movable cylinder assembly is connected to the drive cylinder assembly with the first cam mechanism interposed therebetween, and the rear cylinder assembly is interposed with a predetermined second cam mechanism. When the rear cylinder assembly is extended forward in the optical axis direction by the second cam mechanism, the rear cylinder assembly is further extended with respect to the rear cylinder assembly by the second cam mechanism, and the rear cylinder assembly is moved in the optical axis direction. A front cylinder assembly that supports the taking lens and that retracts with respect to the rear cylinder assembly when retracted rearward, wherein the first cam mechanism is configured to move the drive cylinder assembly and the rear cylinder assembly. An optical axis is provided on one of the optical axes, the optical axis having a shape that makes one round around the photographing optical axis and advances and retracts at least once in the optical axis direction during one round, and regulates the rear cylinder assembly in the extended state. An endless first cam groove having a flat portion extending in a direction perpendicular to the direction, A first cam pin provided on the other of the driving cylinder assembly and the rear cylinder assembly and slidably engaged with the first cam groove, wherein the second cam mechanism comprises: The rear cylinder assembly and the front cylinder assembly each have a shape provided on one of the front cylinder assembly and having a shape of making a round around the photographing optical axis and advancing or retracting at least once in the optical axis direction during one round, and An endless second cam groove having a flat portion extending in a direction perpendicular to the optical axis direction in a portion for regulating the barrel assembly in the extended state; and a second cam groove of the rear barrel assembly and the front barrel assembly. 2. The camera according to claim 1, further comprising a second cam pin provided on the other side and slidably engaged with the second cam groove. 5. A rear cylinder assembly, wherein the movable cylinder assembly is connected to the drive cylinder assembly via the first cam mechanism, and the rear cylinder assembly is provided with a predetermined second cam mechanism. When the rear cylinder assembly is extended forward in the optical axis direction by the second cam mechanism, the rear cylinder assembly is further extended with respect to the rear cylinder assembly by the second cam mechanism, and the rear cylinder assembly is moved in the optical axis direction. A front cylinder assembly that retracts with respect to the rear cylinder assembly when retracted rearward, and supports a photographing lens, wherein the first cam mechanism includes the drive cylinder assembly and the drive cylinder assembly. The rear cylinder assembly has a shape provided on one of the rear cylinder assemblies, which has a shape of making a round around the photographing optical axis and moving forward and backward at least once in the optical axis direction during one round, and restricting the rear cylinder assembly to the extended state. A plurality of feeding positions having different feeding amounts of the rear cylinder assembly from each other. An endless first cam groove having a plurality of steps each extending in a direction perpendicular to the optical axis direction for allowing any stop, and the drive cylinder assembly and the rear cylinder assembly A first cam pin slidably engaged with the first cam groove provided on the other of the first and second cam mechanisms, wherein the second cam mechanism is provided for the rear cylinder assembly and the front cylinder assembly. One of the plurality of stages has a shape in which the first cam pin has a shape of making a round around the photographing optical axis and moving forward and backward in the optical axis direction at least once during one round, and Even if the front cylinder assembly is engaged with a step, the front cylinder assembly is maintained at the same position in the optical axis direction relative to the rear cylinder assembly so as to cover the entire area of the plurality of steps of the first cam groove. In a corresponding portion, an endless second camera having a flat portion having a groove extending in a direction perpendicular to the optical axis direction. A groove, and a second cam pin slidably engaged with the second cam groove, provided on the other of the rear cylinder assembly and the front cylinder assembly. 3. The camera according to claim 2, wherein 6. A rear cylinder assembly, wherein the movable cylinder assembly is connected to the drive cylinder assembly via the first cam mechanism, and the rear cylinder assembly includes a predetermined second cam mechanism. When the rear cylinder assembly is extended forward in the optical axis direction by the second cam mechanism, the rear cylinder assembly is further extended with respect to the rear cylinder assembly by the second cam mechanism, and the rear cylinder assembly is moved in the optical axis direction. A front cylinder assembly that retracts with respect to the rear cylinder assembly when retracted rearward and that supports a photographing lens, wherein the second cam mechanism includes the rear cylinder assembly and the rear cylinder assembly. The front cylinder assembly is provided on one of the front cylinder assemblies, has a shape that makes one round around the photographing optical axis, moves forward and backwards one or more times in the optical axis direction during one revolution, and extends the front cylinder assembly. The front cylinder assembly is provided at a plurality of dispensing positions having different dispensing amounts from each other. An endless second cam groove having a plurality of steps each extending in a direction perpendicular to the optical axis direction, and a rear cam assembly and a front cylinder assembly. A second cam pin slidably engaged with the second cam groove provided on the other of the first and second cam grooves, wherein the first cam mechanism is provided for the drive cylinder assembly and the rear cylinder assembly. One of the plurality of stages has a shape that makes a round around the photographing optical axis and advances and retreats at least once in the optical axis direction during one round, and the second cam pin is any one of the plurality of stages. A portion of the second cam groove corresponding to the entire area of the plurality of steps is perpendicular to the direction of the optical axis so that the rear cylinder assembly maintains the same position in the direction of the optical axis even when engaged with the step. An endless first cam groove having a flat portion having a groove extending in a predetermined direction; the drive cylinder assembly; Provided on the other of the parts tubular assembly, the first of the first cam pin and claim 2, wherein the camera comprising the slidably engaging with the cam groove. 7. A rear cylinder assembly, wherein the movable cylinder assembly is connected to the drive cylinder assembly with the first cam mechanism interposed therebetween, and the rear cylinder assembly is interposed with a predetermined second cam mechanism. When the rear cylinder assembly is extended forward in the optical axis direction by the second cam mechanism, the rear cylinder assembly is further extended with respect to the rear cylinder assembly by the second cam mechanism, and the rear cylinder assembly is moved in the optical axis direction. A front cylinder assembly that retracts with respect to the rear cylinder assembly when retracted rearward, and supports a photographing lens, wherein the first cam mechanism includes the drive cylinder assembly and the drive cylinder assembly. A part provided on one of the rear cylinder assemblies, which revolves at least once in the optical axis direction during one revolution around the photographing optical axis and retreats, and regulates the rear cylinder assembly in the extended state. , The rear cylinder assembly can be moved to any of a plurality of feeding positions having different feeding amounts. An endless first cam groove having a plurality of steps each extending in a direction perpendicular to the optical axis direction, so as to be able to stop, and the other of the drive cylinder assembly and the rear cylinder assembly. A first cam pin provided to slidably engage the first cam groove, wherein the second cam mechanism is one of the rear cylinder assembly and the front cylinder assembly. The front cylinder assembly is provided at a portion where the front cylinder assembly is advanced and retracted at least once in the optical axis direction during one rotation and retracted, and the front cylinder assembly is regulated in the extended state. Endless having a plurality of steps each extending in a direction perpendicular to the optical axis direction so as to be able to stop at any of a plurality of dispensing positions where the relative dispensing amount with respect to the rear cylinder assembly is different from each other. Second cam groove, and the other of the rear cylinder assembly and the front cylinder assembly It is equipment, the second second cam pin and claim 2, wherein the camera comprising the slidably engaging with the cam groove. 8. The driving cylinder assembly includes the first cam groove, and the rear cylinder assembly includes the first cam pin and the second cam groove.
The front cylinder assembly is provided with the second cam pin, and the front cylinder assembly is provided with the second cam pin.
Camera according to the item.