JPH0740985Y2 - Photography lens barrier opening / closing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a taking lens barrier opening / closing device, and more particularly, to a lens barrel installed in a camera, which is automatically or manually pulled out in a photographing state. The present invention relates to an improvement of a photographic lens barrier opening / closing device that automatically opens and closes a lens barrier in association with an operation of expanding and retracting when not in a shooting state.

[Conventional technology]

If you touch the surface of the taking lens of the camera with your hands and oil components (fingerprints) adhere to the surface of the taking lens, or foreign matter such as dust adheres to the surface of the taking lens, the optical performance will be temporarily deteriorated. The oil and fat components adhering to the surface of the taking lens chemically react with the coating layer formed on the surface of the taking lens, causing permanent surface defects, and foreign substances such as dust may permanently damage the surface of the taking lens. Can cause it.

In order to solve these problems, the shooting lens barrier (hereinafter simply referred to as “lens barrier”) on the front of the shooting lens covers the camera lens when it is carried or when not shooting, and the actual shooting is performed. When doing so, the surface of the taking lens is exposed.

The device for opening and closing such a lens barrier has various modes according to various types of cameras.

That is, in a camera of a type in which the lens barrel is retracted to the storage position during non-shooting to make the camera compact, the lens barrier cannot be closed unless the lens barrel is retracted to the storage position. A lens barrier opening / closing device is configured.

Also, in the case of a multifocal type or variable focus type camera that can change the focal length of the taking lens from the short focus side to the long focus side, for example, when the focal length of the taking lens is on the short focus side, The lens barrel projection amount of becomes short.

On the contrary, when the focal length is on the long focal length side, the amount of protrusion from the camera body increases.

Therefore, the lens barrier opening / closing device is configured such that the closing operation of the lens barrier is performed only on the short focus side where the projection amount of the lens barrel from the camera body is shortened.

In the case of the various cameras described above, the lens barrier is opened / closed by a mechanism for opening / closing the lens barrier by using a stored force such as a spring or a drive motor dedicated to opening / closing the lens barrier.

As described above, Japanese Patent Application Laid-Open No. 60-175038 is disclosed as a protective cover device for a photographing lens that opens and closes the lens barrier according to the amount of movement of the lens barrel depending on whether the photographing state or the non-photographing state.

The protective cover for a photographing lens described in this publication is displaced according to the operation of an operating member in conjunction with the protective cover that covers the front surface of the photographing lens that has been retracted from the extended position, and is displaced in the optical axis direction together with the photographing lens. A movable cover opening / closing member is provided, and an engaging means for inserting the cover opening / closing member from the outside of the track on the track in the optical axis direction of the cover opening / closing member and engaging with the cover opening / closing member to open / close the protective cover is provided. When the photographing lens is in the retracted position, the cover opening / closing member engages with the engaging member while the photographing lens is retracted by inserting the engaging member into the orbit so that the protective cover is provided. It is configured to close automatically.

That is, since the protective cover is opened and closed by using the strokes of movement of the lens barrel in the shooting state and the non-shooting state, the structure is simple, the number of parts is small, and the camera can be made compact. Have contributed.

[Problems to be Solved by the Invention] In the taking lens protective cover device described in the above publication, there is a stacking error due to the tolerance of each component, and since it is a multifocal camera, focus adjustment for the entire lens barrel (lens There is a possibility of malfunction due to variations in the storage state during non-shooting due to such reasons (necessary for variations).

The present invention has been made in view of the above circumstances, and its purpose is to open and close a photographing lens barrier that can reliably operate the barrier opening and closing regardless of the difference in the amount of movement of the lens barrel in the shooting state and the non-shooting state. To provide a device.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention has an outer lens barrel provided in a camera body, and a photographing lens held therein, which is extended from the outer lens barrel in a photographing state and in the outer lens barrel in a non-photographing state. An inner lens barrel housed in the inner lens barrel, a photographing lens barrier disposed in front of the inner lens barrel and opened in the photographing state and closed in the non-photographing state, and the photographing state incorporated in the inner lens barrel or the outer lens barrel. A push lever that is sometimes extended from the camera body and returns to the camera body side in the non-shooting state, and a push lever that is incorporated in the inner lens barrel and extends the push lever in the shooting state to open the taking lens barrier and the non-shooting state. In the state, the barrier opening / closing mechanism that closes the photographing lens barrier by the return action of the push lever and the non-shooting mechanism provided between the camera body side and the push lever It is obtained by characterized by comprising an adjustment spring for adjusting a difference in storage size to the outer barrel of the inner barrel during state.

[Action]

The push lever of the photographing lens barrier opening / closing device configured as described above moves forward at the same time when the inner lens barrel is extended from the outer lens barrel in a photographing state, and operates the barrier opening / closing mechanism to open the lens barrier, In the non-shooting state, the push lever is returned to the camera body side, the barrier opening / closing mechanism closes the lens barrier, and the inner lens barrel is stored in the outer lens barrel. The difference in the stored dimensions at this time is adjusted by the adjustment spring. To do.

〔Example〕

Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings.

FIG. 2 is a sectional view showing a conceptual configuration of the taking lens barrier opening / closing device according to the present invention.

In FIG. 2, reference numeral 1 denotes an outer lens barrel, and this outer lens barrel 1
Is fixed to a predetermined position on the front surface of the camera body (not shown). By operating an operating member of the camera body (not shown), along the inner peripheral surface of the outer lens barrel 1,
The extension operation or the storage operation of the inner lens barrel 2 can be performed automatically or manually.

When the camera is in a shooting state (when shooting is possible), the inner lens barrel 2 is retracted from the outer lens barrel 1 as shown in FIG. When in the state (when stored), the inner lens barrel 2 is stored (collapsed) in the outer lens barrel 1.
It is supposed to be done.

Storing of the inner lens barrel 2 in the shooting state and the non-shooting state,
The feeding operation is performed in conjunction with the operation of the operation member, and in the automatic type, is performed by driving the motor,
In the manual type, it is designed to be performed by hand.

Although not shown, a photographing lens is attached inside the inner lens barrel 2, and a lens barrier described later is arranged in front of the photographing lens. The lens barrier is
It is adapted to be opened and closed by the barrier opening / closing mechanism 3.

The barrier opening / closing mechanism 3 is attached to the front side of the inner lens barrel 2. The operation of the barrier opening / closing mechanism 3 is performed by the push lever 4
It is supposed to be done by.

One end of the push lever 4 (the left end in FIG. 2) is connected to the barrier opening / closing mechanism 3 and, as shown in FIG. 3, pushes against a dovetail groove 1a formed on the inner peripheral surface of the outer lens barrel 1 or the like. The slide portion 4a (Fig. 1) of the lever 4 is fitted.

As a result, for example, when the operation member is extended to move to the shooting state, the slide portion 4a of the push lever 4 moves along the dovetail groove 1a of the outer lens barrel 1 and thereby the barrier opening / closing mechanism 3 operates. It is designed to open the barrier.

Further, when the operation member is retracted in order to bring it into a non-photographing state, the push lever 4 moves in the opposite direction to the above, and the barrier opening / closing mechanism 3 closes the lens barrier. The detailed configuration and operation of the barrier opening / closing mechanism 3 will be described later.

In addition, since the focal length of the photographing lens mounted in the inner lens barrel 2 changes, the storage state of the inner lens barrel 2 in the outer lens barrel 1 in the non-photographing state is shown in FIGS.
A dimensional difference occurs as shown in the figure.

FIG. 2 shows the case of a short focal length lens, and FIG. 4 shows the case of a long focal length lens.

As described above, the dimensional difference when the inner lens barrel 2 is stored in the outer lens barrel 1 is clearly shown in FIGS. 5 and 6, and FIG.
The figure is an enlarged view of the portion of the circle A1 in FIG. 2, and FIG.
It is an enlarged view of the part of the circle A2 of FIG.

As shown in FIGS. 5 and 6, the outer lens barrel 1 of the inner lens barrel 2 is
The dimensional difference d when stored in the storage device is adjusted by the adjustment spring 5. The right end of the adjusting spring 5 is fixed or abutted on the bottom of the outer lens barrel 1. The left end of the adjusting spring 5 is fixed or fitted to the right end of the push lever 4.

Next, a detailed configuration of the barrier opening / closing mechanism 3 will be described.

FIG. 7 is an exploded perspective view for explaining the relationship between the holding plate 6 and the push lever 4 of the barrier opening / closing mechanism 3. On the upper portion of the push lever 4, the slide portion described in FIG. 3 above.
4a is provided, and an adjusting spring 5 is attached to the right end of the push lever 4.

As is apparent from FIGS. 8 and 9, a pair of guide portions 4b, 4c are attached to the left end of the push lever 4 by bending upward in an "L" shape with a predetermined interval.

FIG. 8 shows an initial engagement state between the push lever 4 and a lever receiver 6a attached to the holding plate 6, which will be described later. FIG. 9 shows the inner lens barrel 2 when it is finally stored in the outer lens barrel 1. The final engagement state between the push lever 4 and the lever receiver 6a in FIG.

As is clear from FIGS. 8 and 9, the push lever 4
The cam 4d is provided between the guide portions 4b and 4c. The cam 4d is formed to have a spiral taper.

Here, the description returns to FIG. 7. When the push lever 4 is moved in the direction opposite to the arrow Y1 direction in FIG. 7, that is, in the non-shooting state, as the push lever 4 moves in the direction opposite to the arrow Y1 direction, the state shown in FIG. From the state shown in FIG. 9 to the state shown in FIG. 9, the lever receiver 6a is pushed along the cam 4d while rotating in the arrow Y2 direction in FIG. 9 and moving in the arrow Y3 direction.

FIG. 1 is an enlarged exploded perspective view showing the entire configuration of the barrier opening / closing mechanism 3. As is clear from FIG. 1, a substantially rectangular opening 6b is formed in the center of the holding plate 6 so as to face the lens surface of the taking lens.

An "L" -shaped partition wall 6c is projected rearward (to the right in the drawing) in the vicinity of one corner of the short side of the opening 6b. In the partition wall 6c, an arc-shaped elongated hole 6d is formed along the peripheral edge of the opening 6b.

A column 6f is projected near the elongated hole 6d. This prop
The lever receiver 6a (enlarged for ease of understanding) is inserted in 6f.

The lever receiving 6a includes a shaft portion having a protrusion 6a _1, projecting pieces 6a ₂
And a shaft portion having a spring hooking 6a _3, protrusion 6a ₁ and a spring hook
It was stretched between 6a _3, and a torsion spring 6a ₄ Metropolitan for over action absorption of lever receiving 6a. By inserting the column 6f of the pressing plate 6 into the shaft portion of the lever receiving 6a, the lever receiving 6a is rotatably supported by the pressing plate 6.

In the holding plate 6, a guide hole 6g is formed near the column 6f. The guide portion 4b of the push lever 4 is fitted in the guide hole 6g.

Further, in the holding plate 6, a "U" -shaped guide trough 6h is projected in the vicinity of the column 6f. The guide portion 4c of the push lever 4 is fitted in the guide trough 6h.

Further, in the holding plate 6, a semicircular arc-shaped long hole 6i centering on the optical axis of the photographing lens is formed above the guide trough 6h. A spring hook 6j is planted in the holding plate 6 near one end of the elongated hole 6i.

A rising portion 7a formed on the gear ring 7 penetrates and projects into the long hole 6i.

A coil spring 6k is attached between the rising portion 7a and the spring hook 6j. With this coil spring 6k, the gear ring 7
A force that pulls clockwise is always applied to the rising portion 7a.

As is clear from FIG. 1, the gear ring 7 is formed in a substantially annular plate shape, and the above-mentioned rising portion 7a is protruded in a predetermined position on the outer peripheral surface thereof so as to face backward in an “L” shape. ing.

A boss 7b is projected obliquely below the rising portion 7a. The boss 7b is located at the peripheral edge of the opening 6b of the holding plate 6. The boss 7b is adapted to engage with the projecting piece 6a ₂ of the lever receiver 6a.

Spur gears 7c and 7d are provided on both left and right outer peripheral surfaces of the gear ring 7.

The spur gears 7c and 7d are meshed with pinions 8a and 8b rotatably provided on a cover 13 described later. Pinion 8a, 8b
Are integrated with large-diameter gears 9a and 9b, respectively. The gear 9a meshes with the racks 11a and 12a of the lens barriers 11 and 12.

Similarly, the gear 9b is used for the rack 11 of the lens barriers 11 and 12.
It meshes with b and 12b.

The lens barriers 11 and 12 are formed by forming a thin plate material into a "U" shape and face each other so that the lens barrier 11 can be opened and closed in the vertical direction. The rack 11a of the lens barrier 11 is formed on the inner side surface of the lens barrier 11. 11b is formed on the outer surface of the lens barrier 11.

In addition, the rack 12a of the lens barrier 12 is
The rack 12b is formed on the outer side surface of the lens barrier 12, and the rack 12b is formed on the inner side surface of the lens barrier 12.

When the inner lens barrel 2 is stored in the outer lens barrel 1, the lens barriers 11 and 12 move in the arrow Y4 direction in FIG. 1 and the lens barrier 12 moves in the arrow Y5 direction. The lens barriers 11 and 12 are closed, and conversely the inner lens barrel 2
When the lens barrel is extended from the outer lens barrel 1, the lens barrier 11,1
2 moves in the direction opposite to the arrows Y4 and Y5, respectively, and opens vertically.

The lens barriers 11 and 12 and the gear ring 7 are in close contact with the outer surface of the pressing plate 6, that is, the surface on the left side in FIG.

Further, a cover 13 is put on the outer surfaces of the lens barriers 11 and 12 and the gear ring 7.

An opening 13a is formed in the center of the cover 13. The opening 13a is formed in a substantially rectangular shape so as to correspond to the shape and size of the opening 6b of the holding plate 6.

Support shafts 13b and 13c are projected in the vicinity of both long sides of the opening 13a. The pinion 8 is attached to each of the support shafts 13b and 13c.
A and 8b are rotatably supported.

The operation of the embodiment thus configured will be described.

First, the case where the inner lens barrel 2 is moved from the outer lens barrel 1 in the shooting state to the non-shooting state will be described.

In this case, the inner lens barrel 2 is stored inside the outer lens barrel 1 as shown in FIGS. 2 and 4 by operating an operating member provided outside the camera body automatically or manually. .

At the same time, the slide portion 4a of the push lever 4 slides along the dovetail groove 1a of the outer lens barrel 1 in the direction of the arrow Y8 (reverse direction) in FIG. 1, and the cam 4d of the push lever 4 projects from the lever receiver 6a.
By pushing 6a ₂ , the protrusion 6a ₂ of the lever receiver 6a resists the spring biasing force of the torsion spring 6a ₄ , and the protrusion 6a ₂ of the lever 6a ₄ is shown by the arrow Y in FIG.
The rotation starts in the 6 directions (the arrow Y2 direction in FIG. 9) (state in FIG. 8).

In this state, as the push lever 4 further slides in the direction of the arrow Y8, the protruding piece 6a ₂ further rotates in the direction of the arrow Y6 while moving along the cam 4d, and as shown in FIG.
The protruding piece 6a ₁ is located above 4d.

As the protrusion 6a ₂ rotates in the direction of the arrow Y6, the pressing plate 6
The projecting piece 6a ₂ penetrating the long hole 6d of the is the boss 7 of the gear ring 7.
Press b in the direction of arrow Y7.

As a result, the boss 7b moves in an arc shape, and the gear ring 7 is integrally rotated in the arrow Y7 direction against the tension of the coil spring 6k. Along with this, the pinion 8a rotates clockwise, and at the same time, the pinion 8b rotates clockwise.

When the pinion 8a rotates clockwise, the gear 9a integrated with the pinion 8a also rotates clockwise. As a result, the lens barrier 11 moves in the arrow Y4 direction, that is, in the downward direction.

At the same time, the pinion 8b and the gear 9b integral with the pinion 8b also rotate in the clockwise direction to move the lens barrier 12 in the arrow Y5 direction, that is, in the upward direction.

Thus, the lens barriers 11 and 12 are closed. That is, the lens barriers 11 and 12 are closed at the same time when the inner lens barrel 2 is stored in the outer lens barrel 1.

In this way, when the lens barriers 11 and 12 are closed and the inner lens barrel 2 is stored in the outer lens barrel 1 as shown in FIG. 2 or 4, as described above, The difference d between the retracted dimensions of the lens barrel 2 inside the outer lens barrel 1 is determined by the adjustment spring 5
Or it is adjusted by a torsion spring 6a _4. Therefore, the opening / closing operation of the lens barriers 11 and 12 of the barrier opening / closing mechanism 3 does not malfunction.

Next, an operation of opening the lens barriers 11 and 12 of the barrier opening / closing mechanism 3, that is, a case of changing from the non-photographing state to the photographing state will be described.

In this case, the inner lens barrel 2 is extended from the outer lens barrel 1, and the inner lens barrel 2 is extended from the outer lens barrel 1 by operating the operation member of the camera, and at the same time, the push lever 4 slides. The portion 4a moves in the direction of the arrow Y1 in FIG. 1 along the dovetail groove 1a of the outer lens barrel 1, and the guide portions 4b and 4c of the push lever 4 slide in the guide hole 6g and the guide trough 6h, respectively. The lever receiver 6a rotates in the direction opposite to the arrow Y6 in FIG.
The projecting piece 6a ₂ of 6a descends along the cam 4d,
Return to the position shown.

Along with this, the protrusion 6a ₃ of the lever receiver 6a is engaged with the gear ring 7
Release the push of boss 7b. Therefore, the coil spring 6k
Due to the tension, the gear ring 7 is rotated in the direction opposite to the arrow Y7 in FIG.

When the gear ring 7 rotates in the direction opposite to the arrow Y7, the pinions 8a and 8b rotate counterclockwise.

As a result, the gears 9a and 9b also rotate counterclockwise. As a result, the lens barrier 11 moves in the direction opposite to the arrow Y4 and the lens barrier 12 moves in the direction opposite to the arrow Y5. That is, the lens barriers 11 and 12 are opened upward and downward. As a result, the lens surface of the taking lens (not shown)
Is the opening 6b of the holding plate 6, the gear ring 7, the lens barrier 1
It will be exposed through the openings 12a of the cover 12 and the cover 12.

As described above, according to this embodiment, at the same time when the inner lens barrel 2 is extended from the outer lens barrel 1 in the photographing state, the push lever 4 is pushed.
Moves forward to activate the barrier opening / closing mechanism 3, and the lens barrier
In the non-photographing state, the push lever 4 is retracted to close the lens barriers 11 and 12 by the barrier opening / closing mechanism 3, and the inner lens barrel 2 is housed in the outer lens barrel 1 when the photographing is not performed. Since the adjustment spring 5 or the torsion spring 6a ₄ adjusts when there is a storage dimension difference due to the focal length of the taking lens when the lens barrel 1 is stored, the dimension due to the stacking tolerance of the components by the barrier opening / closing mechanism 3. Focus adjustment due to fluctuations in the distance, and the internal lens barrel 2 for wide (wide-angle lens) and tele (telephoto lens) in zoom cameras
Inner lens barrel 2 caused by focus adjustment due to movement of lens
It is possible to eliminate the dimensional variation when storing.

Along with this, malfunction of the barrier opening / closing mechanism 3 can be prevented, and in particular, as shown in FIGS. 2 and 4, a portion where the inner lens barrel 2 contacts the barrier opening / closing mechanism 3 and the outer lens barrel 1. In such an inner lens barrel 2, this is effective for adjustment when the dimensional variation is likely to occur, as in the case where the members at both ends of the inner lens barrel 2 are combinations of different parts.

The invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the invention.

For example, the slide portion 4a of the push lever 4 may be slid to a predetermined position on the inner lens barrel 2 instead of the outer lens barrel 1.

[Effect of device]

As described above in detail, according to the present invention, the inner lens barrel is retracted into or retracted from the outer lens barrel depending on the photographing state and the non-photographing state, and the push lever is advanced and retracted to operate the barrier opening / closing mechanism. Since the barrier opening / closing mechanism is used to open / close the lens barrier and the adjustment spring is used to adjust the dimensional variation when the inner lens barrel is retracted, the dimensional variation and focus due to the stacking tolerance of the components used in the barrier opening / closing mechanism are adjusted. It is possible to adjust the variation in the storage size of the inner lens barrel during the adjustment.

Therefore, it is possible to provide a taking lens barrier opening / closing device capable of preventing malfunction of the barrier opening / closing operation.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing the overall construction of an embodiment of the present invention, FIG. 2 is a sectional view showing the conceptual construction of a photographing lens barrier opening / closing device according to the present invention, and FIG. FIG. 4 is a perspective view showing the dovetail groove formed in the outer lens barrel cut away, and FIG. 4 shows the dimensional difference when the inner lens barrel of the embodiment shown in FIG. 2 is stored in the outer lens barrel. FIG. 5 is a sectional view showing a conceptual configuration for explaining, FIG. 5 is an enlarged view of a portion of circle A1 in FIG. 2, FIG. 6 is an enlarged view of a portion of circle A2 in FIG. 4, and FIG. 2 is an exploded perspective view of a holding plate and a push lever portion of the barrier opening / closing mechanism of the embodiment shown in FIG. 2, FIG. 8 and FIG. 9 show a push lever and a lever receiver in the barrier opening / closing mechanism of FIG. 7, respectively. It is explanatory drawing of an engagement state. 1 ... outer lens barrel, 2 ... inner lens barrel, 3 ... barrier opening / closing mechanism,
4 ... Push lever, 4d ... Cam, 5 ... Adjustment spring, 6 ...
… Presser plate, 6a …… Lever holder, 7 …… Gearing, 11,1
2 ... Lens barrier.

Claims (1)

[Scope of utility model registration request] 1. An outer lens barrel provided in a camera body, and an inner lens barrel which holds a photographing lens therein and is extended from the outer lens barrel in a photographing state and stored in the outer lens barrel in a non-photographing state. And a photographing lens barrier which is arranged in front of the inner lens barrel and which opens in the photographing state and closes in the non-photographing state,
A push lever incorporated into the inner lens barrel or the outer lens barrel and extended from the camera body in the photographing state and returning to the camera body side in the non-photographing state; and a push lever incorporated in the inner lens barrel in the photographing state. The barrier opening / closing mechanism is provided between the camera body side and the push lever, the barrier opening / closing mechanism opening the photographing lens barrier by extending the pushing lever and closing the photographing lens barrier by the returning action of the pushing lever in the non-photographing state. An image taking lens barrier opening / closing device, comprising: an adjusting spring that adjusts a difference in storage dimension of the inner lens barrel into the outer lens barrel in a non-photographing state.