JP3260290B2 - Waterproof structure of lens barrel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof structure for a lens barrel, which prevents water from entering between a lens and a lens support ring.

[0002]

2. Description of the Related Art As a waterproof structure of a lens barrel, for example, a structure is known in which a protective glass is adhered to the front end of the lens barrel via a waterproof adhesive to prevent water from entering the lens barrel. Have been. This structure requires a protective glass, which leads to an increase in the size of the lens barrel and an increase in cost.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a lens mirror which can prevent water from entering a lens barrel with a simple structure without using a protective glass or the like. An object of the present invention is to provide a waterproof structure for a cylinder.

[0004]

Waterproof structure of the lens barrel of the present invention SUMMARY OF THE INVENTION A lens support ring for supporting inwardly while the lens positioned on the objective side front end which restricts the movement of the image plane side of the front lens group, the lens engages the inner periphery of the support ring, to press the peripheral portion of the front surface of the lens and a lens pressing ring for fixing the lens to the lens support ring, the lens retainer ring, the front surface of the lens An annular abutment surface that can abut on the periphery
With a waterproof coating material provided in advance on the annular contact surface of
Then, this waterproof coating material is applied to the periphery of the front of the lens.
It is characterized by surface contact .

[0005]

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. 13. First, the concept of the zoom lens camera will be described with reference to FIG. This camera has a three-stage extension type zoom lens barrel 1 including three extension barrels of a first movable barrel 20, a second movable barrel 19, and a third movable barrel 16.
0 is provided. The lens configuration of the zoom lens barrel 10 includes two groups, a front lens group L1 and a rear lens group L2.

[0006] The camera body includes an overall movement motor control means 60, a rear group movement motor control means 61, and a 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 operation lever or a zoom operation button provided on the camera body is operated, the overall movement motor 25 is controlled by the overall movement motor 25.
In response to this, a move command for moving the zoom lens including the front lens group L1 and the rear lens group L2 from the wide side to the tele side, or a move command for moving the zoom lens from the tele side to the wide side is given.

When the photographer operates the zoom operation means 62, the focal length is changed and set to an arbitrary focal length. The image magnification of the finder field of view of the zoom finder 67 provided in the camera is changed in conjunction with a change in the focal length 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 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
The shutter button is constituted by a release button. When the shutter button is depressed one step, a distance measurement command to the distance measurement device 64 and a photometry command to the photometry device 65 are given. Then, 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 integrally. 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, in the present zoom lens camera, the movement of the front group lens L1 and the rear group lens L2 by the zoom operation means 62 is not performed. This is not performed by the conventional concept of zooming in which the focal length is continuously changed without moving the position of the focal point. 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 aspect of the present invention, a subject at a specific distance is not always in focus, but a lens shutter type camera such as the present camera which does not observe an image by a photographing optical system,
There is no problem at all when it is only necessary to focus when the shutter is released. In the mode (1), the front lens group L1 and the rear lens group L2 are moved while permitting the movement of the focal position, and both the overall movement motor 25 and the rear group movement motor 30 are operated during the shutter release to focus.

After executing any one of the above-described 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 operating means 62 is operated, the entire moving motor 25 and the rear group moving motor 30 are moved.
Without operating any of them, only the visual field magnification and the focal length information of the zoom finder 67 are changed, and when the shutter release means 63 is operated, the focal length information and the subject distance information by the distance measuring device 64 are used as a whole. By moving the moving motor 25 and the rear group moving motor 30 simultaneously, the front lens group L1 and the rear lens group L2 can be moved to positions uniquely determined by the focal length information and the subject distance information.

Next, an embodiment in which the zoom lens barrel having the above concept is concretely described mainly with reference to FIGS. 11 and 12. FIG. First, the schematic configuration and operation of the zoom lens barrel 10 will be described.
A movable lens barrel 19, a third movable lens barrel 16, and a fixed lens barrel block 12 are provided. The third movable lens barrel 16 is screwed to the cylindrical portion 12p of the fixed lens barrel block 12, and advances and retreats in the optical axis direction with rotation. The third movable barrel 16 has a rectilinear guide tube 17 whose rotation is regulated and moves inward in the optical axis direction, and the second movable barrel 19 rotates with respect to the rectilinear guide tube 17. While moving back and forth in the optical axis direction. The rotation of the first movable lens barrel 20 is restricted, and the first movable lens barrel 20 moves in the optical axis direction by rotating with respect to the second movable lens barrel 19. The whole moving motor 25 is fixed to the fixed lens barrel block 12, and the shutter mount 40 on which the rear group moving motor 30 and the AE motor 29 are mounted is fixed to the first moving lens barrel 20. The front lens group L1 includes a front lens support cylinder (lens support ring) 34.
The rear group lens L2 is a lens having a negative power supported by the rear lens support cylinder 50.

The outer periphery of the front end of the front lens support tube 34 and the inner peripheral flange 2 formed at the front end of the first movable lens barrel 20.
An O-ring 70 is provided between the inner peripheral edge of Ob. The O-ring 70 prevents water from entering between the first movable lens barrel 20 and the front lens support cylinder 34.

As shown in FIG. 14, the front lens group L1 is
The first lens L1a, the second lens L1b, the third lens L1c, the fourth lens L1d, and the fifth lens L1e in order from the object side (the left side in the figure) to the image plane side (the right side in the figure).
It consists of two lenses. A positioning ring 36 is sandwiched between the second lens L1b and the third lens L1c, and a positioning ring 37 is sandwiched between the third lens L1c and the fourth lens L1d. The fourth lens L1d and the fifth lens L1e are bonded lenses that are formed by bonding the rear surface (the lens surface on the image side) of the fourth lens L1d and the front surface (the lens surface on the object side) of the fifth lens L1e. is there. Second
The front edge of the peripheral portion of the lens L1b is in contact with the rear surface of the first lens L1a, and the peripheral portion of the rear surface of the fifth lens L1e is
It is in contact with an inner flange 34b formed at the rear end of the front lens support cylinder 34.

A female screw portion 34a is formed on the inner circumference of the front end of the front lens support cylinder 34, and the male screw portion 72a of the lens press ring 72 is screwed to the female screw portion 34a. The lens press ring 72 is molded from a synthetic resin.
The lens pressing ring 72 is formed with an annular abutting surface 72b that abuts on the peripheral edge fp on the front surface of the first lens L1a. The annular contact surface 72b is provided at the peripheral edge f of the front surface of the front lens unit L1.
It is formed substantially in parallel with p, and is in contact with substantially surface contact.

In the front lens support cylinder 34, an outer peripheral surface o of the first lens L1a is formed inside the female screw portion 34a.
A support annular portion 34c in which p is fitted to the inner peripheral surface is formed. Further, in the front lens support cylinder 34, behind the support annular portion 34c, a position regulating surface 34d which abuts on the peripheral portion of the rear surface of the first lens L1a to regulate the movement of the first lens L1a toward the image surface side is provided. Is formed. That is, the first lens L1a is provided between the position regulating surface 34d and the lens holding ring 72.
The movement in the optical axis direction with respect to the front lens support cylinder 34 is restricted by being held between the annular contact surface 72b and the radial movement by the support annular portion 34c.

As shown in FIG. 16, a resinous waterproof coating material 72e is applied on the annular contact surface 72b. In the present embodiment, “Fantascoat SF-6” manufactured by Origin Electric Co., Ltd. is used as the waterproof coating material 72e applied on the annular contact surface 72b. The lens holding ring 72 is properly fitted by the waterproof coating material 72e applied on the annular contact surface 72b, that is, the male screw portion 72a of the lens holding ring 72 is attached to the front lens support cylinder 34.
When the annular contact surface 72b is appropriately screwed to the peripheral edge portion fp by being screwed into the female screw portion 34a, the annular contact surface 72b
And the intrusion of water between the edge portion and the peripheral portion fp is prevented. This is for the following reason. That is, since the peripheral portion fp of the front surface of the first lens L1a is a part of the effective lens surface, its surface is very smooth. However, the annular contact surface 72b of the lens pressing ring 72 made of synthetic resin is When the waterproof coating material 72e is not applied to the surface, the first lens L1a
The surface is considerably rougher than the peripheral portion fp of the front surface, and has fine irregularities on the surface. Therefore, in the case where nothing is applied on the annular contact surface 72b, even if the annular contact surface 72b and the peripheral edge portion fp properly abut, the minute irregularities on the annular contact surface 72b are not affected. Therefore, a slight gap is formed between the two, and there is a possibility that water may enter the lens barrel from this gap. In the present embodiment, the annular contact surface 72b
The coating material 72e for waterproofing is applied thereon to substantially eliminate minute irregularities on the annular contact surface 72b,
b is formed as a smooth surface. Thereby, when the annular contact surface 72b and the peripheral edge fp properly contact,
There is no substantial gap between the two. Therefore, in the lens barrel provided in the camera of the present embodiment, intrusion of water between the annular contact surface 72b and the peripheral portion fp is prevented.

The lens holding ring 72 has an annular contact surface 7.
On the outer peripheral side of 2b, there is provided an annular surface (annular engaging portion) 72c fitted to the front end of the outer peripheral surface op of the first lens L1a.
The structure in which the annular surface 72c is fitted to the front end of the outer peripheral surface op enhances the waterproof performance between the lens press ring 72 and the first lens L1a.

An annular recess 34e is formed in the front lens support cylinder 34 between the female screw portion 34a and the support annular portion 34c, and as shown in FIG.
When the lens 2 is properly mounted, the rear end portion 72d of the lens pressing ring 72 is located in the annular concave portion 34e. The structure in which the rear end portion 72d of the lens holding ring 72 is positioned in the annular concave portion 34e allows the male screw portion 72a and the female screw portion 34 to be positioned.
It is difficult for water to enter the interior from between a.

The fixed lens barrel block 12 fixed in front of the aperture plate 14 of the camera body has a cylindrical portion 12p.
A female helicoid 12a and a plurality of linear guide grooves 12 that are parallel to the optical axis O and traverse the female helicoid 12a.
b. One of the plurality of linear guide grooves 12b has a code plate 1 having a predetermined pattern on the bottom thereof.
3a is fixed. The code plate 13 a is configured as a part of the flexible printed circuit board 13 located outside the fixed lens barrel block 12. Aperture plate 1
Reference numeral 4 denotes an aperture 14 for determining an exposure area on the film.
a.

The cylindrical portion 12p of the fixed lens barrel block 12 is formed with a gear housing portion 12c which swells radially outward and extends in the optical axis direction (see FIG. 7). A drive pinion 15 that is long in the optical axis direction is rotatably stored in the gear storage portion 12c. The drive pinion 15 is provided with two ends of the shaft 7 at support holes 4 provided in the fixed lens barrel block 12.
And a support hole 31a provided in the gear support plate 31 so as to be rotatable. The tooth surface of the drive pinion 15 protrudes inward from the inner peripheral surface of the cylindrical portion 12p of the fixed lens barrel block 12.

A third movable lens barrel 16 is screwed onto the inner periphery of the cylindrical portion 12p of the fixed lens barrel block 12. This third
The movable lens barrel 16 has a plurality of rectilinear guide grooves 16c extending in the optical axis direction on the inner peripheral surface, and a male helicoid 16a meshing with the female helicoid 12a of the cylindrical portion 12p on the rear end outer periphery.
An outer peripheral gear 16b (see FIG. 6) that meshes with the drive pinion 15. The drive pinion 15 has an axial length that meshes with the outer peripheral gear 16b in the entire movement range of the third movable lens barrel 16.

A linear guide tube 17 is supported on the inner periphery of the third movable barrel 16 so as to be integrally movable with the third movable 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. 11) protruding radially inward on the inner periphery of the rear end.
d is inserted through the notch 17f so that both flanges 17
It is positioned in the gap between d and 17e, and is connected to the rectilinear guide tube 17 by rotating by a predetermined amount with respect to the rectilinear guide tube 17. An aperture 14a is provided on the rear end face of the
An aperture plate 23 having an opening 23a having substantially the same shape as that of the aperture plate 23 is fixed. The engaging projection 17c is attached to the fixed lens barrel block 12
Is slidably engaged with the straight guide groove 12b parallel to the optical axis of the optical disc and its rotation is restricted. 1 of the engagement projection 17c
A 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 projection 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 lens barrel 19 has a plurality of lead grooves 19 that are inclined on the inner peripheral surface in a direction opposite to the lead grooves 17b.
and a plurality of follower projections 19a having a trapezoidal cross section protruding outward in the radial direction and a follower pin 18 located on the follower projection 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
Slidably fitted in the lead groove 17b of the straight guide cylinder 17,
The follower pin 18 is provided in the straight guide groove 1 of the third movable lens barrel 16.
6c slidably fits. Therefore, when the third movable lens barrel 16 rotates, the second movable lens barrel 19 rotates and moves straight in the optical axis direction.

The 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. 1 and 2, 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.
A guide leg portion 22b is inserted between the inner peripheral surface of the first movable lens barrel 20 and the AF / AE shutter unit 21 so as to be capable of linearly guiding. are doing.

The annular portion 22a of the straight guide member 22 is
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 are formed in the circumferential direction of the retaining flange portion 22c. (See FIG. 1). The second movable lens barrel 19 has a plurality of engaging projections 19b (FIG. 11) projecting inward in the radial direction on the inner periphery of the rear end portion. The linear guide member 22 is positioned in the gap between the flange portions 22c and 22d.
Is connected to the rectilinear guide member 22 by a predetermined amount of rotation. With the above configuration, the first movable lens barrel 20 is
When the second movable barrel 19 rotates in the forward or reverse direction, the second movable barrel 19 moves straight back and forth with respect to the optical axis direction with respect to the second movable barrel 19 while the rotation is restricted.

At the front end of the first movable lens barrel 20, a barrier device 35 having barriers 48a and 48b is mounted.
An AF / AE shutter unit 2 having a shutter 27 including three shutter blades 27a (FIG. 5) on the inner peripheral surface.
1 is fitted and fixed. The AF / AE shutter unit 21 has a plurality of fixing holes 40a (FIG. 3) formed at equal angular intervals on the outer periphery of the shutter mount 40.
The plurality of follower pins 24 also serve as fixing means for the AF / AE shutter unit 21, and are provided in a pin hole 20 a formed in the first movable lens barrel 20 and the fixing hole 40 a.
The follower pin 24 is fitted and fixed, and the shutter unit 21 is fixed to the first movable lens barrel 20 (see FIG. 4). The follower pin 24 can be fixed by, for example, bonding, screwing, or the like. 41 is the first movable lens barrel 20
This is a decorative plate that is fixed to the front end of the display.

The AF / AE shutter unit 21 is shown in FIG.
12, a shutter mount 40, a shutter blade support ring 46 fixed to the rear of the shutter mount 40, and a rear group lens movably supported with respect to the shutter mount 40. And a support cylinder 50.
The shutter mount 40 supports a front group lens support ring 34, an AE motor 29, and a rear group moving motor 30. The shutter mount 40 is provided with a front lens support cylinder 34.
An annular portion provided with a photographing opening 40d engaged with the rear end of the
Three legs 40 extending rearward from the annular portion
b. Two of the gaps between the three legs 40b are a pair of guide legs 22b of the linear guide member 22.
Are slidably engaged with each other to guide the movement.

The shutter mount 40 further includes an AE gear train 45 for transmitting the rotation of the AE motor 29 to the shutter 27.
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 AE motor 29 is formed by the photointerrupter 56 and the rotating plate 58.
An AE motor encoder that detects the rotation of the 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 a 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 flexure restricting surface 46c that is exposed from 0c and slidably supports the inner peripheral surfaces of the pair of guide legs 22b (see FIGS. 9 and 10).

The support member 47 located in front of the shutter blade support ring 46 includes a photographing opening 47a facing the photographing opening 46a, and three shaft portions 47b (see FIG. 5) 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 includes a shaft portion 47b supporting the shutter blade 27a.
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 rear lens support cylinder 50 movably supported on the shutter mount 40 via slide shafts 51 and 52 is disposed. Shutter mount 40 and rear lens support cylinder 50
Are urged to move away from each other by the coil spring 3 fitted to the slide shaft 51, thereby eliminating play between the two. 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 rear lens support cylinder 50 is screwed to the female screw, and the drive gear 42a 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 in either the forward or reverse direction, the screw shaft 43 advances and retreats with respect to the drive gear 42a, and the rear lens support cylinder 50, that is, the support cylinder 50
Is moved 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. In a state where 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 surface of the straight guide cylinder 17, and the cylinder of the fixed lens barrel block 12 is fixed. An annular retaining member 3 is provided at the front end of the
3 is fitted.

In the present embodiment, the rear lens group L2 is
The AE motor 29 and the rear group moving motor 30
It is equipped with. According to this configuration, there is an advantage that the supporting structure and the driving structure of the front group lens L1 and the rear group lens L2 can be simplified, but the rear group lens L2 is attached to the shutter mount 40, the annular driving member 49, the supporting member 47, Shutter 2
The zoom lens is established even if the AF / AE shutter unit 21 including the shutter blade 7 and the shutter blade holding ring 46 is provided as a separate member and is supported by a support member different from the unit.

The present zoom lens camera operates as follows. When the power switch (not shown) is turned on while the zoom lens barrel 10 is in the lens retracted state shown in FIG. 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 cylindrical portion 12p of 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 rectilinear guide cylinder 17 is engaged with the engagement projection 17c and the rectilinear guide groove 12b. Due to the relationship, the lens barrel advances together with the third movable lens barrel 16 forward of the optical axis without rotating with respect to the fixed lens barrel block 12. At this time, the second movable lens barrel 19 engages the follower pin 18 with the lead groove 17b and the linear guide groove 16c at the same time, so
While rotating in the same direction as the movable barrel 16, it moves forward of the optical axis with respect to the movable barrel 16. The first movable lens barrel 20 is
Since the linear guide member 22 guides the linear movement and the follower pin 24 is moved and guided by the lead groove 19c, the follower pin 24 does not rotate with respect to the fixed lens barrel block 12.
AF / AE shutter unit 21 from the second movable lens barrel 19
Together with 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. 8). The focal length set by the zoom operation unit 31 is displayed by a display unit (not shown).

When the release button is pressed one step (half-pressed) at an arbitrary focal length set by the zoom operating 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. , Photometry and ranging are started. Thereafter, when the release button is pressed in two steps (fully pressed), both the whole movement motor 25 and the rear group movement motor 30 are moved by the movement amount obtained from the subject distance information by the distance measuring device 64 and the zoom operation means 62. The front lens group L1 and the rear lens group L2 are moved by the movement amount determined in consideration of the movement amount obtained by the set focal length information to achieve the set focal length and focus on the subject,
The AE motor 29 rotates the annular driving member 49 in accordance with the subject luminance information from the photometric device 65 via the AE motor control means 66, and drives the shutter 27 so as 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 movement 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, the zoom lens barrel 10 is moved into the lens housing position shown in FIG.

In the above-described embodiment, the waterproof coating material 72e applied to the annular contact surface 72b is a resinous coating material such as “Fantas Coat” manufactured by Origin Electric Co., Ltd.
SF-6 "is applied, but another resin coating material may be applied. Further, a configuration in which another non-resinous coating material is applied may be adopted.

In the above embodiment, the waterproof coating material 72e is applied on the annular contact surface 72b of the lens holding ring 72 made of synthetic resin. However, the lens holding member made of another material (for example, a metal material) is used. Annular contact surface 72 of ring 72
The waterproof coating material 72e may be applied on the surface b.

[0046]

As described above, according to the waterproof structure of the lens barrel of the present invention, the coating material is provided on the annular contact surface formed on the lens holding ring. The intrusion of water into the lens barrel is prevented with a simple and simple configuration.

[Brief description of the drawings]

FIG. 1 is an enlarged perspective view showing a part of a zoom lens barrel to which the present invention is applied.

FIG. 2 is a perspective view showing a part of the zoom lens barrel in a state different from FIG.

FIG. 3 is an exploded perspective view showing a part of the zoom lens barrel in an enlarged manner.

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

FIG. 6 is a perspective external view showing a third movable lens barrel of the zoom lens barrel.

FIG. 7 is a front view showing a fixed barrel block of the zoom lens barrel.

FIG. 8 is an upper half sectional view showing a maximum extension state of the zoom lens barrel.

FIG. 9 is an upper half sectional view showing a main part of the zoom lens barrel in a lens housed state.

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

FIG. 11 is an upper half cross-sectional view showing a lens storage state of the entire zoom lens barrel.

FIG. 12 is an exploded perspective view showing the entire zoom lens barrel.

FIG. 13 is a block diagram showing a control system for controlling the operation of the zoom lens barrel.

FIG. 14 is an upper half sectional view showing a main part of the zoom lens barrel according to the present invention;

FIG. 15 is a perspective external view showing a front lens support cylinder.

FIG. 16 is a cross-sectional view showing an enlarged main part of the front lens support cylinder.

[Explanation of symbols]

 Reference Signs List 10 Zoom lens barrel 12 Fixed barrel block 16 Third movable barrel 19 Second movable barrel 20 First movable barrel 34 Front lens support barrel (lens support ring) 34a Female threaded part 34c Support annular part 34d Position regulating surface 34e Annular concave portion 36 37 Positioning ring 72 Lens holding ring 72a Male screw portion 72b Annular contact surface 72c Annular surface (annular engagement portion) 72e Waterproof coating material O

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-63-148212 (JP, A) JP-A-7-20366 (JP, A) JP-A-62-9617 (JP, A) JP-A-6-96617 347607 (JP, A) JP-A-1-197706 (JP, A) JP-A-60-107812 (JP, U) JP-A-5-64811 (JP, U) JP-A-59-168742 (JP, U) 50-120446 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) G02B ⁷ /02-7/105

Claims (6)

(57) [Claims] 1. A lens positioned on the object side front end of the front lens group
A lens support ring supported inside a's while restricting the movement of the image plane side, engages the inner periphery of the lens support ring, the lens the lens to press the peripheral portion of the front surface of the lens and a lens retainer ring fixed to the support ring, the lens pressing ring is substantially flush to the peripheral portion of the front surface of the lens
And an annular contact surface that can be
Has a waterproof coating material that has been
A waterproof structure for a lens barrel, which is in surface contact with a peripheral portion of a front surface of the lens. 2. The waterproof structure according to claim 1, wherein the lens support ring is formed on an inner periphery of the lens support ring and abuts on a peripheral edge of a rear surface of the lens to move the lens toward the image surface side. A waterproof structure for the lens barrel that has a position regulating surface that regulates movement. 3. The waterproof structure according to claim 1, wherein the lens holding ring is screwed to an inner periphery of the lens support ring. 4. The waterproof structure according to any one of claims 1 to 3, further lens retainer ring, the outer peripheral side of the annular abutment surface, a full annular engaging portion fitted to the lens The waterproof structure of the lens barrel. 5. The waterproof structure according to claim 1, wherein an annular edge portion on the image surface side of the lens holding ring is more outer than the annular engaging portion on the lens supporting ring. The waterproof structure of the lens barrel that fits into the annular recess formed in the lens. 6. The waterproof structure according to claim 1, wherein the waterproof coating material is a resin coating material previously applied on the annular contact surface. Construction.