JP3200004B2 - Lens barrel with shutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens barrel having a shutter unit fixed in a cylinder which advances and retreats in an optical axis direction.

[0002]

2. Description of the Related Art Conventionally, as a lens shutter type camera, when a zoom lens barrel provided in a camera body is moved forward and backward in the optical axis direction, a shutter unit built in the lens barrel is moved forward and backward in the optical axis direction. There is a known one provided with a moving mechanism for causing the movement. Such moving mechanisms include:
A rotary barrel having a cam groove on an inner surface, which is driven to rotate by receiving rotation of a motor, and a shutter unit which includes a follower pin which is engaged with the cam groove of the rotary barrel and is guided straight in the optical axis direction. There is a type that includes a rectilinear lens barrel and moves the rectilinear lens barrel together with the shutter unit when the rotating lens barrel rotates.

By the way, in such a moving mechanism, conventionally,
The shutter unit has been fixed to the rectilinear lens barrel with fixing pins. For this reason, there is a member (fixing pin) completely unrelated to a mechanism for moving the rectilinear lens barrel in the optical axis direction, and the number of components has been increased. In order to respond to the recent demand for a more compact camera, it is desired to reduce even small components such as the fixing pins.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a lens barrel having a shutter having a structure capable of reducing the number of parts based on the above-mentioned conventional problem awareness.

[0005]

SUMMARY OF THE INVENTION According to a first aspect of the present invention, there is provided a drive cylinder having a cam groove on an inner surface and driven to rotate; A lens barrel having a follower pin that engages with the cam groove and advances and retreats in the optical axis direction due to the rotational movement of the driving cylinder; and a lens barrel that includes a shutter unit fixed in the translation cylinder. A radial pin hole is formed in each of the unit and the unit, and a follower pin is inserted from the pin hole of the rectilinear barrel to the pin hole of the shutter unit, and the shutter unit is fixed to the rectilinear barrel by the follower pin. The cam groove of the driving cylinder includes a linear lead groove.

According to another aspect of the present invention, there is provided a shutter fixing cylinder; a radial shutter fixing pin hole formed in the shutter fixing cylinder; A fixing member for fixing the unit in the shutter fixing cylinder; a follower pin head projecting outward from the shutter fixing cylinder integrally with the fixing member; a cam groove engaging with the follower pin head; An outer cylinder that rotates relative to the fixed cylinder is provided. The cam groove of the outer cylindrical body includes a linear lead groove.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on illustrated embodiments. In this embodiment, the present invention is applied to the lens shutter type zoom lens camera shown in FIG. 14. First, the concept of this zoom lens camera will be described with reference to FIG. The lens configuration is the front group lens L
1 and a rear lens unit L2.

In the camera body, the whole moving motor control means 60, the rear group moving motor control means 61, the zoom operation means 6
2, shutter release means 63, distance measuring device 64, photometric device 65, and AE motor control means 66 are provided.

When the zoom operation means 62 such as a zoom lever provided on the camera body is operated, the whole movement motor control means 60 controls the whole movement motor 25 with a zoom lens comprising a front group lens L1 and a rear group lens L2. A command for moving the camera from the wide side to the tele side, or a command for moving the camera from the tele side to the wide side. The focal length is changed by the operation of the zoom operation unit 62 by the photographer, and is set to an arbitrary focal length. The image magnification of the finder field is changed in conjunction with the focal length change by the zoom operation means 62. Therefore, the photographer can know the change in the focal length due to the operation of the zoom operation unit 62 by observing the change in the image magnification of the finder field. The focal length set by the operation of the zoom operation unit 62 can be recognized by, for example, a numerical value displayed on an LCD display panel (not shown).

When the shutter release means 63 is operated, the whole-group moving motor control means 60 is also driven by the rear-group moving motor control means 61.
At the same time, the overall movement motor 25 is driven to focus the zoom lens on the subject. The shutter release means 63
It is composed of a release button, and gives a distance measuring command to the distance measuring device 64 and a light measuring command to the light measuring device 65 by pressing the shutter button in one step, and a AE motor control means 66 by pressing the shutter button in two steps.
The shutter 27 of the AF / AE shutter unit 21 is operated. The shutter 27 receives the photometric output from the photometric device 65 and opens its shutter blade 27a for a predetermined time.

When operated, the zoom operation means 62 drives the whole movement motor 25 to move the front lens group L1 and the rear lens group L2 together. At the same time as this movement, the rear group moving motor 30 may be operated via the rear group moving motor control means 61. However, the important point of this zoom lens camera is that the front group lens L1 and the rear group lens The movement of L2 is not performed by the conventional zooming concept of continuously changing the focal length without moving the focal point position. That is, when the zoom operation means 62 is operated, only the whole movement motor 25 is operated, and the front group lens L
1 and the rear group lens L2 are moved back and forth without changing the air gap between them, and the front group lens L1 and the rear group lens L2 are operated by operating both the overall movement motor 25 and the rear group movement motor 30. Is moved while changing the air gap between the two.

In the embodiment of the present invention, it is impossible that a subject at a specific distance is always in focus. However, in a lens shutter type camera such as this camera which does not observe an image obtained by a photographing optical system, focus is obtained when a shutter is released. There is no problem at all if it fits. In the aspect, the front lens group L1 and the rear lens group L2 are moved while allowing the focal position to move, and both the entire moving motor 25 and the rear group moving motor 30 are operated during the shutter release to focus. .

After executing one of the above-mentioned control modes in response to the operation of the zoom operation means 62, the shutter release means 63 is operated in at least a part of the focal length range of the focal length set by the zoom operation means 62. When this is done, the whole moving motor 25 and the rear group moving motor 30
Are operated to focus on the subject. The amount of movement of the front group lens L1 and the rear group lens L2 by the entire movement motor 25 and the rear group movement motor 30 at this time is not limited to the amount of movement obtained by subject distance information by the distance measuring device 64,
It is determined in consideration of the amount of movement obtained by the focal length information set by the zoom operation means 62. As described above, when the shutter release means 63 is operated and both the overall movement motor 25 and the rear group movement motor 30 are operated to perform the focusing operation, the degree of freedom in controlling the lens position is increased, and the control thereof is performed. Becomes easier.

Note that, theoretically, when the zoom operation means 62 is operated, the whole movement motor 25 and the rear group movement motor 30 are moved.
Without operating any of them, only the view magnification of the finder and the focal length information are changed, and the shutter release means 63
Is operated, the focal length information and the distance measuring device 64
, The front and rear group lenses L1 and L2 are moved to the positions uniquely determined by the focal length information and the subject distance information. It can also be done.

Next, an embodiment in which the zoom lens barrel having the above concept is concretely described mainly with reference to FIG. 1 and FIG. First, the schematic configuration and operation of the zoom lens barrel 10 will be described. In order from the front, a first movable barrel 20, a second movable barrel 19, a third movable barrel 16, and a fixed barrel block 12 are provided. Have been. The third movable lens barrel 16 is screwed to the cylindrical portion of the fixed lens barrel block 12, and moves forward and backward in the optical axis direction with rotation. The third movable lens barrel 16 has a rectilinear guide tube 17 whose rotation is regulated and moves in one direction in the optical axis direction, and the second movable lens tube 19 rotates relative to the rectilinear guide tube 17. While moving back and forth in the optical axis direction. First movable lens barrel 20
Is restricted in rotation, and moves forward and backward in the optical axis direction due to relative rotation with respect to the second movable lens barrel 19. Overall moving motor 2
5 is fixed to the fixed lens barrel block 12 and the AE motor 2
9 and a shutter mount 40 equipped with a rear group moving motor 30
Is fixed to the first movable lens barrel 20. Front group lens L
Reference numeral 1 denotes a lens having positive power supported by the lens support tube 34, and the rear lens group L2 includes a lens support tube 50
Is a lens having a negative power supported by the lens.

The fixed lens barrel block 12 fixed in front of the aperture plate 14 of the camera body has a female helicoid 12a, a plurality of rectilinear guide grooves 12b parallel to the optical axis O, on the inner peripheral surface of the cylindrical portion. have. A code plate 13a having a predetermined pattern is fixed to the bottom of one of the plurality of straight guide grooves 12b. This code plate 13
a is configured as a part of the flexible printed circuit board 13 located outside the fixed lens barrel block 12. The aperture plate 14 has an aperture 14a for determining an exposure area on the film.

The cylindrical portion of the fixed lens barrel block 12 has a gear housing portion 12c bulging radially outward and extending in the optical axis direction.
Are formed (see FIG. 9). This gear storage section 12c
, A driving pinion 15 long in the optical axis direction is rotatably housed. The drive pinion 15 has both ends of the shaft 7 rotatably supported by a support hole 4 provided in the fixed lens barrel block 12 and a support hole 31 a provided in the gear support plate 31. The tooth surface of the drive pinion 15 projects from the inner peripheral surface of the fixed lens barrel block 12.

A third movable barrel 16 is screwed into the inner periphery of the fixed barrel block 12. This third movable lens barrel 16
Has a plurality of linear guide grooves 16 extending in the optical axis direction on the inner peripheral surface.
c, a male helicoid 16a meshing with the female helicoid 12a of the fixed lens barrel block 12 and an outer peripheral gear 16b meshing with the drive pinion 15 (see FIG. 8). The drive pinion 15 includes a third movable lens barrel 16.
Has an axial length that meshes with the outer peripheral gear 16b in the entire moving range in the optical axis direction.

A linear guide tube 17 is supported on the inner periphery of the third movable lens barrel 16 so as to be integrally movable with the third movable lens barrel 16 in the optical axis direction and relatively rotatable around the optical axis. . The rectilinear guide cylinder 17 includes a rear end flange portion 17d having a plurality of engagement protrusions 17c protruding radially outward on the rear outer periphery,
A retaining flange 1 having a smaller diameter than the flange 17d, which is provided with a slight gap in front of the rear end flange 17d.
7e. A plurality of notches 17f are formed in the circumferential direction of the retaining flange 17e. The third movable lens barrel 16 has a plurality of engaging projections 16d (FIG. 1) protruding radially inward on the inner periphery of the rear end portion.
Is inserted from the notch 17f, and both flange portions 17d are inserted.
It is located in the gap between the straight guide tubes 17e and is connected to the straight guide tube 17 by rotating relative to the straight guide tube 17.
An aperture plate 23 having an opening 23a having substantially the same shape as the aperture 14a is fixed to a rear end surface of the straight guide cylinder 17. The engagement protrusion 17c is slidably engaged with a straight guide groove 12b parallel to the optical axis O of the fixed lens barrel block 12, and its rotation is restricted. The contact terminal 9 for slidingly contacting the code plate 13a and generating a signal corresponding to the focal length during zooming is fixed to the engagement protrusion 17c ', which is one of the engagement protrusions 17c.

The straight guide cylinder 17 also has an inner peripheral surface
A plurality of rectilinear guide grooves 17a parallel to the optical axis O and a plurality of lead grooves 17b penetrating the peripheral wall of the guide cylinder 17 and inclined with respect to the circumferential direction and the optical axis direction are formed.

A second movable lens barrel 19 is fitted on the inner periphery of the straight guide cylinder 17. The second movable barrel 19 has, on the inner peripheral surface thereof, a plurality of lead grooves 19c, which are slidably engaged with the follower pins 24 on the first movable barrel 20 side, and are inclined in a direction opposite to the lead grooves 17b. I have. The cam groove is non-linear,
When the rotating barrel having the cam groove is rotated at a constant speed, the moving speed of the follower pin engaged with the cam groove is changed, and the moving operation of the member having the follower pin is changed. The lead groove 19c is linear, and moves the follower pin 24 at a constant speed in the optical axis direction when the second movable lens barrel 19 rotates at a constant speed. That is, lead groove 1
Reference numeral 9c denotes a mode in which the first moving lens barrel 20 is simply moved in the optical axis direction via the follower pin 24 when the movement speed change in the cam groove is O, and is naturally included in the cam groove.

The second movable lens barrel 19 is provided on the outer periphery of the rear end.
It has a plurality of trapezoidal follower projections 19a protruding radially outward, and a follower pin 18 located on the follower projections 19a. The follower pin 18 includes a ring member 18a and a center fixing screw 18b that supports the ring member 18a on a follower projection 19a. The follower projection 19a is slidably fitted in the lead groove 17b of the rectilinear guide cylinder 17, and the follower pin 18 is
The movable barrel 16 is slidably fitted in the straight guide groove 16c.
Therefore, when the third movable lens barrel 16 rotates, the second movable lens barrel 19 rotates and moves straight in the optical axis direction.

A first movable lens barrel 20 is fitted on the inner periphery of the second movable lens barrel 19. The first movable lens barrel 20 engages a plurality of follower pins 24 provided on the outer periphery of a rear end portion with a corresponding inner peripheral lead groove 19c, and a linear guide member 22.
Is guided straight ahead. This straight guide member 22 is
As shown in FIGS. 5 and 6, an annular portion 22a, a pair of guide legs 22b extending from the annular portion 22a in the optical axis direction,
The linear guide groove 1 protrudes radially outward of the annular portion 22a.
7a and a plurality of engagement projections 28 slidably engaged with the first movable lens barrel 20. On the inner peripheral surface of the first movable lens barrel 20, a guide leg portion 22b is provided on a linear guide portion 40c of the AF / AE shutter unit 21.
Is inserted so that it can guide straight ahead.

The annular portion 22a of the linear guide member 22
The second movable lens barrel 19 is coupled to the rear end portion so as to be integrally movable in the optical axis direction and relatively rotatable around the optical axis. The rectilinear guide member 22 has a rear end flange portion 22d having a plurality of engagement protrusions 28 protruding radially outward on a rear outer periphery.
And a retaining flange portion 22c smaller in diameter than the flange portion 22d, provided with a slight gap in front of the rear end flange portion 22d, and a plurality of notches 22e in the circumferential direction of the retaining flange portion 22c. (See FIG. 5). The second movable lens barrel 19 has a plurality of engaging projections 19b (FIG. 1) protruding radially inward on the inner periphery of the rear end portion. Flange part 2
It is located in the gap between 2c and 22d, and is connected to the rectilinear guide member 22 by rotating relative to the rectilinear guide member 22. With the above configuration, the first movable lens barrel 20 is
When the movable barrel 19 rotates forward and backward, the movable barrel 19 moves straight back and forth with respect to the second movable barrel 19 in the optical axis direction while the rotation is restricted.

At the front end of the first movable lens barrel 20, a barrier 4
A barrier device 35 having 8a and 48b is mounted, and an AF / AE shutter unit 21 having a shutter 27 including three shutter blades 27a (FIG. 7) is fitted and fixed to the inner peripheral surface.

The AF / AE shutter unit 21 is shown in FIG.
13, a shutter mount 40, a shutter blade support ring 46 fixed to the rear of the shutter mount 40, and a lens support movably supported with respect to the shutter mount 40. Tube 50 (rear group lens L
2). The front lens L1, the AE motor 29, and the rear group moving motor 30 are supported by the shutter mount 40. The shutter mount 40 has an annular portion having a shooting opening 40d through which the lens support tube 34 is inserted, and three legs 40b extending rearward from the annular portion. Two of the gaps between the three legs 40b are a pair of guide legs 2 of the straight guide member 22.
It is configured as a rectilinear guide part 40c for receiving and guiding the movement of each of them 2b. This straight guide unit 4
0c is a straight guide surface 4 in a direction parallel to the optical axis O and in sliding contact with the guide leg 22b of the straight guide member 22.
0e.

An AE gear train 45 for transmitting the rotation of the AE motor 29 to the shutter 27 is further provided on the shutter mount 40.
And the rotation of the rear group moving motor 30 with the screw shaft 4
3 and the photo interrupters 56 and 57 connected to the flexible printed circuit board 6.
Rotating plates 58, 5 having a number of circumferential slits
9 are supported. The photointerrupter 57 and the rotating plate 59 constitute a rear group moving motor encoder for detecting the rotation of the rear group moving motor 30, and the photointerrupter 56 and the rotating plate 58 constitute the AE motor 29.
An AE motor encoder that detects the rotation of the AE motor is configured.

Between the shutter mount 40 and the shutter blade support ring 46 fixed to the mount 40, the shutter 2
7, a support member 47 for pivotally supporting the three shutter blades 27a of the shutter 27, and an annular driving member 49 for applying rotational power to the shutter blades 27a. The annular driving member 49 includes three operation protrusions 49a respectively engaging with the three shutter blades 27a at equal angular intervals. The shutter blade support ring 46 is provided at the front wall with the photographing opening 4.
6a and three support holes 46b provided at equal angular intervals around the photographing opening 46a.
It has a deflection regulating surface 46c exposed from Oc and slidably supporting the inner peripheral surfaces of the pair of guide legs 22b (see FIGS. 11 and 12).

Further, a support member 47 located in front of the shutter blade support ring 46 has a photographing opening 47a facing the photographing opening 46a and three shaft portions 47b (see FIG. 7) facing the three support holes 46b, respectively. (Only parts are shown). Each of the three shutter blades 27a has, at one end, a shaft hole 27b through which the shaft 47b is inserted, and at the other end, a shielding portion that shields the imaging openings 46a, 47a.
An elongated hole 27c is provided between the one end and the other end to allow the operation projection 49a to pass therethrough. The support member 47 is provided with the respective shaft portions 47b supporting the shutter blades 27a, respectively.
The shutter blade support ring 46 is fixed to the shutter blade support ring 46 in a state of being fitted into the corresponding support hole 46b.

The annular driving member 49 has a gear train 4 on its outer periphery.
5 has a gear portion 49b for receiving rotation from. The support member 47 has three arc grooves 47c in the circumferential direction at positions close to the three shaft portions 47b. The three operation projections 49a of the annular driving member 49 penetrate through the three arc grooves 47c, and the long holes 27 of the respective shutter blades 27a.
c. The shutter blade support ring 46 is inserted from the rear side of the shutter mount 40 while supporting the annular driving member 49, the support member 47, and the shutter 27, and is screwed to the shutter mount 40.

Behind the shutter blade support ring 46, a lens support cylinder 50 supported by the shutter mount 40 via slide shafts 51 and 52 so as to be relatively movable is disposed. The shutter mount 40 and the lens support cylinder 50 are urged to move in the direction away from each other by the coil spring 3 fitted to the slide shaft 51, thereby eliminating play between them. The drive gear 42a provided in the gear train 42 is restricted from moving in the axial direction, and a female screw is formed on the inner periphery thereof. A screw shaft 43 having one end fixed to the lens support cylinder 50 is screwed to the female screw.
And the screw shaft 43 constitute a feed screw mechanism. Therefore, when the rear group moving motor 30 is driven to rotate and the drive gear 42a rotates forward or backward, the screw shaft 43 advances and retreats with respect to the drive gear 42a, and is supported by the lens support tube 50, that is, the support tube 50. The rear lens group L2 moves relative to the front lens group L1.

At the front of the shutter mount 40, holding members 53, 55 for holding the motors 29, 30 and the like supported by the shutter mount 40 are screwed. The motors 29 and 30 and the photo interrupters 56 and 57 are connected to the flexible printed circuit board 6 having one end fixed to the shutter mount 40.

Here, a fixing structure for fixing the AF / AE shutter unit 21 having the above structure to the inner peripheral side of the first movable lens barrel 20 will be described with reference to FIGS.

That is, the first movable lens barrel (straight-moving barrel, shutter-fixing barrel) 20 has three radial pin holes (shutter-fixing pin holes) 20 formed in the rear end face at equal angular intervals.
a. Also, AF / AE shutter unit 2
The shutter mounting base 40 having a substantially cylindrical shape, which is a part of the member that constitutes the component 1, has three leg portions 40 b extending rearward, and a radial fixing hole (pin hole) corresponding to the pin hole 20 a. 40a are provided at equal angular intervals. Follower pin 2
Reference numeral 4 denotes a head (follower pin head) 24a having a diameter larger than that of the pin hole 20a and the fixing hole 40a and formed in a substantially conical shape, and having a diameter smaller than that of the pin hole 20a and the fixing hole 40a. And a cylindrical through portion 24b. In a state where the fixing hole 40a and the pin hole 20a are aligned with each other, the penetration portion 24b of the follower pin 24 having the head portion 24a protruding outside the first movable lens barrel 20 is fitted and fixed to both of them. The / AE shutter unit 21 is fixed in the first movable lens barrel 20 via the shutter mount 40. The follower pin 24 can be fixed to the first movable lens barrel 20 and the shutter mount 40 by, for example, bonding, screwing, or the like.

As described above, the follower pin 24 is connected to the AF /
The AE shutter unit 21 is guided to move by a fixing member (fixing pin) for fixing the AE shutter unit 21 to the first movable lens barrel 20 and by a lead groove (cam groove) 19 c of a second movable lens barrel (drive cylinder, outer cylinder) 19. It has a function as a follower pin. Therefore, since there is no member dedicated to the fixing means of the shutter unit, which is completely unrelated to a mechanism for moving the first movable lens barrel 20 in the optical axis direction, the number of parts is reduced, and the camera is more compact recently. Can respond to the request. The follower pin 24
This movable lens barrel 20 is used as a position reference for the first movable lens barrel 20.
The AF / AE shutter unit 21 fixed to the movable lens barrel 20 by the follower pin 24 having high positional accuracy with respect to the movable lens barrel 20 must be strictly determined. Is determined with high accuracy.

When the first to third movable lens barrels 20, 19, 16 and the AF / AE shutter unit 21 and the like are assembled, an aperture plate 23 is fixed to the rear end face of the straight guide cylinder 17, and a fixed lens barrel block is provided. An annular retaining member 33 is fitted to the front end of the twelve. 41 is the first
A decorative plate fixed to the front end of the movable lens barrel 20.

In the present embodiment, the front lens group L1 and the rear lens group L2 are respectively connected to the AF / AE shutter unit 21.
The AE motor 29 and the rear group moving motor 30 are mounted on the unit 21. According to this configuration, there is an advantage that the supporting structure and the driving structure of the front lens unit L1 and the rear lens unit L2 can be simplified, but at least one of the front lens unit L1 and the rear lens unit L2 is
Shutter mount 40, annular drive member 49, support member 4
7, the zoom lens is realized even if the AF / AE shutter unit 21 including the shutter 27 and the shutter blade holding ring 46 is provided as a separate member and is supported by a support member different from the unit.

This zoom lens camera operates as follows. When the power switch (not shown) is turned on in the lens retracted state of FIG. 1 in which the zoom lens barrel 10 is most retracted, the whole moving motor 25 is slightly rotated in the positive direction. Then, this rotation is transmitted to the drive pinion 15 via the gear train 26 supported by the support portion 32, and the third
Since the movable lens barrel 16 is rotated in the extending direction, the second movable lens barrel 19 and the first movable lens barrel 20 are slightly extended in the optical axis direction together with the third movable lens barrel 16, and the camera widens the zoom lens. The camera is ready for shooting at the end.

In this photographing enabled state, when the zoom operation means 62 is operated to the telephoto side, the whole movement motor 25 is driven to rotate in the forward direction via the whole movement motor control means 60, and is driven via the drive pinion 15 and the outer peripheral gear 16b. To rotate the third movable barrel 16 in the extending direction. Therefore,
The third movable lens barrel 16 is extended from the fixed lens barrel block 12 due to the relationship between the female helicoid 12a and the male helicoid 16a, and at the same time, the straight guide tube 17 is fixed by the relationship between the engagement projection 17c and the straight guide groove 12b. Block 12
With the third movable lens barrel 16 in a state of not rotating relative to the optical axis, it advances forward of the optical axis. At this time, the second movable lens barrel 19
The follower pin 18 is connected to the lead groove 17b and the linear guide groove 1
By simultaneously engaging with the third movable lens barrel 6c, the second movable lens barrel 6 relatively moves in the same direction as the third movable lens barrel 16 and moves forward in the optical axis with respect to the third movable lens barrel 16. The first movable lens barrel 20 is
Since the linear movement guide member 22 guides the linear movement and the follower pin 24 is moved and guided by the lead groove 19 c, the second movable lens barrel 19 and the AF / AE shutter unit 21 are not rotated relative to the fixed lens barrel block 12. Advances ahead of the optical axis.

While the zoom lens barrel 10 is driven in this manner, the rear group moving motor 30 is not driven, so that the front group lens L1 and the rear group lens L2 are integrated with the optical axis while maintaining a constant distance from each other. (See FIG. 10). The focal length set by the zoom operation unit 31 is displayed by a display unit (not shown).

When the release button is depressed one step at an arbitrary focal length set by the zoom operation means 62, a distance measuring command is given to the distance measuring device 64 and a light measuring command is given to the light measuring device 65, and the entire moving motor 25 is moved. And the rear group moving motor 30 are both determined by taking into account the amount of movement obtained from the subject distance information by the distance measuring device 64 and the amount of movement obtained from the focal length information set by the zoom operating means 62. The front lens group L1 and the rear lens group L2 are moved by the amount to set the focal length and focus on the subject. When the release button is pressed two steps in this state, the AE motor 2
9 rotates the annular driving member 49 in accordance with the subject luminance information from the photometric device 65, and drives the shutter 27 to satisfy a predetermined exposure. After the end of the shutter release, both the overall movement motor 25 and the rear group movement motor 30 are immediately driven, and the front lens group L1 and the rear lens group L2 are returned to the state before the shutter release.

When the zoom operation means 62 is operated to the wide side, the whole moving motor 25 is driven to rotate in the reverse direction, and the third movement is performed.
The movable lens barrel 16 is rotated in the retracting direction, and is retracted into the fixed lens barrel block 12 together with the rectilinear guide cylinder 17. At the same time, the second movable lens barrel 19 is retracted into the movable lens barrel 16 while rotating in the same direction as the third movable lens barrel 16, and
The movable lens barrel 20 is moved by A with respect to the rotating second movable lens barrel 19.
It is moved together with the F / AE shutter unit 21.
Also during this retraction drive, the rear group moving motor 30 is not driven, as in the above-described retraction drive. When the power switch is turned off after the zoom lens is moved to the wide end position, the zoom lens barrel 10 is moved into the lens storage position shown in FIG.

[0043]

As is apparent from the above description, according to the first aspect of the present invention, there is no need for a member dedicated to the fixing means of the shutter unit, which is completely unrelated to a mechanism for moving the rectilinear barrel in the optical axis direction. Therefore, the number of parts can be reduced correspondingly, and it is possible to meet the recent demand for more compact cameras. In addition, since the follower pin is to be strictly determined as a relative position to the rectilinear cylinder as a position reference of the rectilinear cylinder, a shutter unit fixed to the rectilinear cylinder by a follower pin having a high positional accuracy with respect to the rectilinear cylinder is: The fixed position with respect to the rectilinear cylinder can be determined with high accuracy.

According to the third aspect of the present invention, there is no member dedicated to the fixing means of the shutter unit, which is completely unrelated to the mechanism for moving the shutter fixing cylinder in the optical axis direction. Can be reduced, and it is possible to meet the recent demand for a more compact camera.

[Brief description of the drawings]

FIG. 1 is an upper half sectional view showing a zoom lens barrel according to an embodiment of the present invention, in a lens housed state.

FIG. 2 is an upper half sectional view showing a main part of the zoom lens barrel.

FIG. 3 is a perspective view showing a main part of the zoom lens barrel.

FIG. 4 is a perspective view showing a state in which an AF / AE shutter unit of the zoom lens barrel is assembled to a first movable barrel.

FIG. 5 is a perspective view showing a main part of a linear guide mechanism of an AF / AE shutter unit in the zoom lens barrel.

FIG. 6 is a perspective view showing a main part of the straight traveling guide mechanism in a state different from FIG. 6;

FIG. 7 is an exploded perspective view showing main members of an AF / AE shutter unit of the zoom lens barrel.

FIG. 8 is a perspective external view showing a third movable lens barrel of the zoom lens barrel.

FIG. 9 is a front view showing a fixed lens barrel block of the zoom lens barrel.

FIG. 10 is an upper half sectional view showing a maximum extended state of the zoom lens barrel.

FIG. 11 is an upper half sectional view showing a main part of the zoom lens barrel in a lens housed state.

FIG. 12 is an upper half sectional view showing a main part of the zoom lens barrel in a maximum extended state.

FIG. 13 is an exploded perspective view showing the entire zoom lens barrel.

FIG. 14 is a block diagram showing a control system for controlling the operation of the zoom lens barrel.

[Explanation of symbols]

Reference Signs List 10 zoom lens barrel (lens barrel) 19 second movable barrel (drive barrel, outer barrel) 19c lead groove (cam groove) 20 first movable barrel (straight advance barrel, shutter fixed barrel) 20a pin hole ( Pin hole for fixing shutter 21 AF / AE shutter unit (shutter unit) 24 Follower pin (fixing member) 24a Head (follower pin head) 24b Penetrating part 40 Shutter mount 40b Leg 40a Fixing hole (pin hole)

Continuation of the front page (56) References JP-A-8-220412 (JP, A) JP-A-7-209568 (JP, A) JP-A-60-130709 (JP, A) JP-A-5-84909 (JP) , U) Japanese Utility Model Hei 4-42617 (JP, U) Japanese Utility Model Hei 1-59209 (JP, U) Japanese Utility Model Hei 4-16406 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB Name) G02B 7/02-7/105

Claims (4)

(57) [Claims] 1. A drive cylinder having a cam groove on its inner surface and driven to rotate; and a follower pin which is guided linearly and engages with a cam groove of the drive cylinder. A lens barrel comprising: a rectilinear barrel that moves forward and backward in the direction; and a shutter unit fixed in the rectilinear barrel. In the lens barrel, a radial pin hole is formed in each of the rectilinear barrel and the shutter unit. From the pin hole to the pin hole of the shutter unit,
A lens barrel having a shutter, wherein the follower pin is inserted, and a shutter unit is fixed to a rectilinear barrel by the follower pin. 2. The lens barrel according to claim 1, wherein
A lens barrel having a shutter in which a substantially cylindrical shutter mounting base, which is a part of a member constituting a shutter unit, is provided with the above-mentioned radial pin fitting hole. 3. A shutter fixing cylinder; a radial shutter fixing pin hole formed in the shutter fixing cylinder; and a shutter unit inserted through the shutter fixing pin hole to fix the shutter unit in the shutter fixing cylinder. A follower pin head projecting outward from the shutter fixing cylinder integrally with the fixing member; a cam groove engaging with the follower pin head, and rotating relative to the shutter fixing cylinder. An outer cylindrical body; and a lens barrel having a shutter. 4. The lens barrel according to claim 3, wherein
A substantially cylindrical shutter mounting base which is a part of a member constituting the shutter unit is provided with a radial pin hole corresponding to the shutter fixing pin hole, and the pin hole and the shutter fixing pin hole are aligned. A lens barrel having a shutter in which a follower pin is fitted and fixed to both in a state where the shutter is fixed, and the shutter unit is fixed in a shutter fixing cylinder via a shutter mounting base.