JP2554774B2 - Lens barrier device - Google Patents

Description

The present invention relates to a lens barrier device for a camera.

[Prior Art] Most of recent compact cameras use a lens barrier device to protect the taking lens when not in use. As such a lens barrier device, the device disclosed in Japanese Utility Model Application Laid-Open No. 63-178817 is provided by the present applicant, and the structure of this device will be described with reference to FIG.

A shield plate 1 that can be opened and closed in front of the taking lens 10
1, 12 are engaged with a rotatable ring 13 via forks 14, 15. These members are respectively incorporated in the movable cylinder.

The ring 13 is biased clockwise by a spring 16 about the optical axis, and a gear portion 17 is formed on a part thereof. A sector gear 18 meshes with the gear portion 17. The sector gear 18 is fixed in the movable cylinder parallel to the optical axis and at the tip of a rotatable shaft 19. A lever 21 having a pin 20 provided in a protruding manner is fixed to the other end of the shaft 19.

The fork portion 22a of the knob 22 has a protrusion 23a on the slide plate 23.
Are fitted together, and the slide plate 23 can be moved left and right by moving the knob 22 between the indexes "C" and "O". A cam surface 23b is formed on the slide plate 23, and a cam follower 26 pushed up by a spring 25 having a stronger biasing force than the spring 16 is in contact with the cam surface 23b. As a result, when the slide plate 23 is moved left and right via the knob 22, the cam follower 26 moves up and down. The cam follower 26 is formed with an inclined surface 26a on which the pin 20 abuts, and when the cam follower 26 is moved up and down with the pin 20 abutting on the inclined surface 26a, the shaft 19 rotates via the lever 21. It will be done.

[Problems to be Solved by the Invention]

However, the lens barrier device as described above is in contact with the opening / closing means constituted by the knob 22 and the slide plate 23, and the member for controlling the opening / closing of the shield plates 11, 12 by the movement of the knob 22 and the slide plate 23 is the sector gear 19, the shaft 19, Pin 20, lever 21, spring 2
Since it is composed of 5 and the cam follower 26, the number of parts is large and the cost is increased. Further, even if such a member is taken into consideration in terms of assembly, the number of working steps increases, which is not preferable.

[Object of the Invention]

The present invention has been made to solve the above-mentioned drawbacks of the prior art, and simplifies the configuration of the member that links the opening / closing means for opening / closing the shield plate and the shield plate, and reduces the cost. An object of the present invention is to provide a lens barrier device capable of achieving the above.

[Means for solving the problem]

In order to achieve the above object, the present invention relates to a shield plate that can be opened and closed freely on the front surface of a lens incorporated in a lens barrel, and has both ends bent, one end of which is related to the shield plate or a member for driving the shield plate. And a supporting member that is incorporated inside the lens barrel and supports the rod member in the optical axis direction between the lens barrel and the supporting member, and abuts on the other end of the rod member, An opening / closing means for controlling the opening / closing of the shielding plate by utilizing the twist of the rod member.

[Action]

According to the above configuration, when the opening / closing means comes into contact with the other end of the rod member and moves, the rod member pivotally supported by the supporting means is twisted, and this twisting biasing force is transmitted to one end of the rod member. Controls the opening and closing of the shield.

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

〔Example〕

FIGS. 1 to 4 show a first embodiment of the present invention, and the taking lens of the camera according to this embodiment is a two-group zoom lens.

The lens barrel unit of this camera includes an intermediate barrel 32 and a movable barrel 33 supported inside a fixed barrel 31 fixed to the front surface of the body 30.
It consists of and.

The intermediate cylinder 33 is provided with a male helicoid 32a that fits a female helicoid provided on the inner periphery of the fixed frame 31 and a gear 32b that is transmitted to the drive of the lens motor provided inside the body 30 on the outer periphery. , Intermediate barrel by driving the lens motor
32 rotates to move the movable cylinder 33 forward and backward.

This movable cylinder 33 is provided with a male helicoid 33a on the outer periphery, which is combined with a female helicoid 32c provided on the inner periphery of the intermediate cylinder 33,
It moves back and forth by the helicoid mechanism. The movable barrel 33 is prevented from rotating by a rotation stopping mechanism (not shown).

The front lens group 34 is provided in the movable barrel 33 with a shutter lock 34a.
The lens barrel motor is started by operating the switchable main switch 35 provided on the rear surface of the body 30 and the movable barrel 33 is projected from the storage position by the rotation of the intermediate barrel 32. Move to position. afterwards,
For example, every time the lever type zooming button 36 is pressed in the direction of arrow A or B shown in FIG. 2, the intermediate cylinder 33 responds to the drive of the lens motor and the movable cylinder 33 moves forward to the telephoto shooting position and the wide angle. Moved to and from the shooting position. Note that when the movable barrel 33 is moved between the telephoto shooting position and the wide-angle shooting position, the rear group lens 38 advances and retracts within a lens frame 37 provided behind the front group lens 34 by a known mechanism.

Further, a light projecting window 39 and a light receiving window 40 of an autofocus device are provided on the front surface of the body 30, and these are used to move the rear lens group 38 forward and backward to adjust the focus of the zoom lens. Further, a strobe light emitting section 41 having an auto zoom mechanism is attached to the front right side of the body 30, and flash control of this strobe light emitting section 41 changes an irradiation angle according to information from an autofocus device or a zooming button 36, It is controlled by a flashmatic mechanism to illuminate the subject.

In addition, this camera has a movable lens barrier device 33
The lens barrier is opened and closed when the movable barrel 33 is moved between the storage position and the projecting position.

A lens window is attached to the cover frame 46 attached to the front of the movable barrel 33.
45 is formed, and the shield plates 47, 48, the ring 49, and the pressing plate 50 are incorporated between them. This shield 4
7,48 are opened and closed by the movement of the movable tube 33.

On the rear end side of the cover frame 46, restriction pins 46c, 46d for restricting the open positions of the shielding plates 47, 48 and bearings 46a, 46b are provided. By inserting fulcrum pins 47a and 48a, which are respectively planted on the front end sides of the shielding plates 47 and 48, into these bearings 46a and 46b, the shielding plates 47 and 48 are supported so as to be openable and closable. Further, interlocking pins 47b, 48b are planted on the rear end side of the shielding plates 47, 48,
The tip ends of these interlocking pins 47b, 48b are engaged with the cutout holes 49a, 49b of the ring 49.

The ring 49 is configured such that the opening 49c slides on the outer periphery of the protrusion 50a provided on the pressing plate 50. When the ring 49 is fitted on the outer periphery of the protrusion 50a, a gap is formed between the ring 49 and the pressing plate 50, and the protrusion plate 49d provided on the ring 49 and the ring 49 are aligned with each other along the optical axis P. A spring 50 that biases counterclockwise as the center can be interposed.

Both ends of the protruding plate 49d are bent, and one end 52a of a rod portion 52 supported by a bearing 50b of the pressing plate 50 is engaged in the movable barrel 33 in parallel with the optical axis P. The other end 52b of the rod 52 is sandwiched between the rear end of the movable barrel 33 and the rib 37a of the lens frame 37, and the bent tip 52c is in contact with the valley of the female helicoid 32c of the intermediate barrel 32. . This makes the rod 5
2 moves forward and backward integrally with the movable barrel 33 in response to the rotation of the intermediate barrel 32, and the bending tip portion 52c has a female helicoid 32c.
It is designed to slide along the valley. When the number of helicoids is multiple, at least the bending tip 52c slides in order to avoid the possibility that the sliding of the bending tip 52c may damage the valley of the female helicoid 32c and cause malfunction of the helicoid. Female helicoid 32c within range
It is also possible to form a large valley portion and to provide a gap between this and the mountain portion of the male helicoid 33a.

At the valley of the female helicoid 32c, there is provided a restricting portion 32d that comes into contact with the bent tip 52c when the movable cylinder 33 is located at the storage position. The restriction portion 32d has a shape inclined from the valley portion of the female helicoid 32c toward the inner peripheral surface 32e of the intermediate cylinder 32, and when the bent tip portion 52c abuts on the restriction portion 32d, the rod portion 52d Is twisted counterclockwise to rotate the ring 49 clockwise about the optical axis P. With the rotation of the ring 49, the shield plates 47, 48 respond to the fulcrum pins 47a, 48a via the interlocking pins 47b, 48b to close the lens window 45.

The operation of the above configuration is performed as follows.
FIG. 3 shows a state in which the movable cylinder 33 is at the storage position and the shield plates 47 and 48 are closed. In this state, the spring
The ring 49 is urged counterclockwise by 51,
Since the bent tip portion 52c is in contact with the restriction portion 32d of the intermediate cylinder 32, the ring is formed via the one end 52a of the rod portion 52 and the protruding plate 49d.
The rotation of 49 is blocked and the shield plates 47, 48 are maintained in the closed position shown.

After that, when the main switch 35 is operated, the intermediate cylinder 32 is rotated by driving the lens motor. The rotation of the intermediate cylinder 32 rotates clockwise around the optical axis P, and the trough of the female helicoid 32c rotates from the restriction portion 32d to the position of the bent tip portion 52c.

When the valley of the female helicoid 32c rotates to the position of the bending tip 52c, the rod 52 is twisted in the clockwise direction by the bias of the spring 51, so that the bending tip 52c follows the inclination of the regulating portion 32d. The ring 49 rotates counterclockwise about the optical axis P in response to this movement.

By the rotation of the ring 49, the shield plates 47, 48 are fulcrum pins 27a, 48a via the cutout holes 49a, 49b and the interlocking pins 47b, 48b.
Opening and closing with the center as the center, the state shown in FIG. 4 is obtained. In this state, since the ring 49 is biased in the counterclockwise direction by the spring 51, the shield plates 47 and 48 are always in contact with the restriction pins 46c and 46d, respectively, and the protruding plate 49 and the one end 52a are interposed. The bent tip 52c is in contact with the valley of the female helicoid 32c.

This state is the protruding position of the movable barrel 33, and the camera is ready for shooting.

After shooting, the camera is not in use. The operation of the main switch 35 is performed when the camera is not used. By this operation, information indicating the unused state is input to the camera side, the lens motor is driven in the opposite direction to the above-described driving direction, and the intermediate cylinder 32 is rotated counterclockwise about the optical axis P.

The rotation of the intermediate cylinder 32 causes the valley of the female helicoid 32c to rotate while sliding on the bent tip 52c. After that, when the restricting portion 32d comes into contact with the position of the bent tip 52c, the bent tip 52 is pressed and the rod 52 is twisted counterclockwise.

As a result, the ring 49 is inserted through the one end 52a and the protruding plate 49d.
Rotates clockwise about the optical axis P. This ring
The rotation of 49 is against the bias of the spring 51, and the rotation of the ring 49 causes the shield plates 47, 48 to center on the fulcrum pins 47a, 48a via the interlocking pins 47b, 48b and the cutout holes 49a, 49b. Moves to block the lens window 45.

This stops the driving of the lens motor, and the movable barrel
The state shown in FIG. 3 showing the storage position of 33 is obtained.

When the rod portion 52 is made of a material having a spring property, the driving timing of the lens motor is delayed and the movable cylinder 33
Even if is over the storage position, or even if a foreign substance or the like is mixed between the shielding plates 47 and 48, it is absorbed by the spring property of the rod portion 52, so that the lens barrier device is not damaged.

Next, a second embodiment of the lens barrier device according to the present invention will be described. This second embodiment is shown in FIG. Lens barrel
The 60 is fixed to the camera body, and this camera is a fixed focus camera. As described in the first embodiment, the holding tube 50, the ring 49, the shielding plates 47 and 48, and the cover frame 46 (not shown) are incorporated in the lens barrel 60.

The difference from the first embodiment is that the shield plates 47, 48 are opened and closed by operating the knob 61 exposed to the outside of the camera body.

The rod portion 62 has a shape as shown in the figure, and the lens barrel 33
The inside is supported by the notch 60 provided at the front end of the lens barrel 33.
A method is employed in which the rod portion 61 is inserted in a and the pressing plate 50 is attached so as to be pressed by the notch surface 50c.
Although not shown, the rod portion 62 is also supported on the rear end side of the lens barrel 60 using the above-described supporting method.

The rear end side of the rod portion 61 is engaged with a connecting hole 62a provided in the knob 62, and the rod portion 61 is twisted by moving the knob 62 between the indexes "C" and "O". Energized ring
Rotate 49.

Note that the knob 61 is moved by the click mechanism as shown in the figure.
It is maintained by 63.

The switch means 64 detects that the knob 61 has been moved to the open position of the shield plates 47, 48, that is, the index “O”, and the signal from the switch means 64 causes the camera to be ready for shooting. There is something.

Next, a third embodiment of the lens barrier device according to the present invention will be described. In FIG. 6 showing the third embodiment, a lens barrel 70 holding a taking lens is provided movably between a position protruding from the body and a position entering the body by a retractable mechanism known to cameras. There is.

An opening / closing member 071 is provided on the camera body, and a slope 71a is formed on the opening / closing member 71. This slope 7
The rear end side of the rod portion 72 is engaged with 1a, and these are spring 51
The lens barrel 70 is devised so as to continuously slide between the position where it is projected from the body and the position where it is inserted into the body by the biasing of.

The engagement state between the inclined surface 71a and the rear end portion of the rod portion 72 shown in the figure is a state in which the lens barrel 70 has entered the body, and from this state, the lens barrel 70 with respect to the optical axis P. When moving forward, the rear end of the rod portion 72 responds to the displacement of the slope 71a, and rotates the ring 49 counterclockwise about the optical axis P. As a result, the shield plates 47 and 48 are opened.

〔The invention's effect〕

As described above, according to the lens barrier device of the present invention, since both ends of the rod member that interlocks the shield plate and the opening / closing member are bent, and the rod member is twisted to interlock with each other, Compared with the conventional technology, the number of parts is greatly reduced, and the cost is reduced. Further, the supporting means for rotatably supporting the rod member does not require so much space inside the lens barrel, and has the effect of surely improving the compactness of the lens barrel as compared with the prior art.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of essential parts showing a first embodiment of the lens barrier device according to the present invention. FIG. 2 is a perspective view showing a camera using the lens barrier device shown in the first embodiment. 3 and 4 are schematic explanatory views of the lens barrier device shown in the first embodiment. FIG. 5 is an exploded perspective view of essential parts showing a second embodiment of the lens barrier device according to the present invention. FIG. 6 is a main part exploded perspective view showing a third embodiment of the lens barrier device according to the present invention. FIG. 7 is a perspective view of essential parts showing a conventional technology of a lens barrier device. 11,12,47,48 …… Shield plate 13,49 …… Ring 22,61 …… Knob 31 …… Fixed space 32 …… Intermediate tube 33 …… Moveable tube 50 …… Pressing plate 52,62,72 …… Rod part 60, 70 …… Body tube.

Claims (1)

(57) [Claims] 1. A camera provided with a lens barrel, wherein a shield plate which is openable and closable is provided on the front surface of a lens incorporated in the lens barrel, and both ends are bent, and one end of the shield plate drives the shield plate or the shield plate. A rod member engaged with the member, a support means incorporated inside the lens barrel and supporting the rod member in the optical axis direction between the lens barrel and the supporting member, and a support member at the other end of the rod member. A lens barrier device, which is in contact with the opening and closing means for controlling the opening and closing of the shielding plate by utilizing the twist of the rod member.