JP2000292830A - Barrier opening / closing device, lens barrel and camera - Google Patents

Abstract

(57) [Problem] To provide a camera which can be miniaturized with a small number of parts without requiring a complicated structure and which can sufficiently exhibit a hood effect. SOLUTION: At the time of shooting, a lens surface is exposed at the time of shooting by barrier members 401 and 411 which are arranged at the tip of the lens barrel of the camera and can be opened and closed forward to the lens barrel with respect to a plane orthogonal to the optical axis of the shooting lens. In a non-photographing mode, the configuration of the barrier opening / closing device that covers the lens surface is configured such that the barrier member is movably supported between a closed position that covers the lens surface and an open position substantially along the optical axis of the lens. The barrier member is moved to the open position by the elastic restoring force, acts on the spring member 402 by the action member 405 to elastically deform, and the barrier member is moved to the closed position by the displacement of the spring member 402 accompanying the elastic deformation. I moved it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zoom lens camera, and more particularly to a barrier opening / closing device, and a lens barrel and a camera provided with the barrier opening / closing device.

[0002]

2. Description of the Related Art Conventionally, a pair or a plurality of barrier members provided at a tip end of a lens in a lens barrel of a camera are moved perpendicularly to an optical axis by using a moving operation between a retracted position and a extended position of a lens barrel or the like. Japanese Patent Application Laid-Open No. 7-19 / 1994
No. 1380.

[0003] In addition, a manual opening / closing device in which a door-shaped barrier portion at the front end of the lens opens and closes toward the subject side manually is disclosed.
-091341.

[0004]

However, in the above-mentioned camera having a barrier member disclosed in Japanese Patent Application Laid-Open No. Hei 7-191380, a complicated mechanism for driving the barrier member in the lens barrel is disclosed. When the barrier member is opened, a large space for evacuation is required in the lens barrel.

In the barrier mechanism disclosed in Japanese Utility Model Laid-Open Publication No. 04-009341, the tip of the opened barrier member is sharp, so that the barrier member itself has no hood effect, and separate components of the hood member and the barrier member are used. Since it is necessary, the number of parts increases.

An object of the invention according to the present application is to provide a barrier opening / closing device, a lens barrel and a barrier opening / closing device which can be reduced in size with a small number of parts without requiring a complicated structure, and which can sufficiently exhibit a hood effect. Is to provide a camera.

[0007]

A first configuration of a barrier opening / closing device for realizing the object of the present invention is that a barrier opening / closing device is provided between a closed position covering a front surface of an optical element and an open position substantially along the optical axis of the optical element. Barrier support means for movably supporting the barrier member, urging means for moving the barrier member to the open position by an elastic restoring force, and elastically deforming by acting on the urging means; And an operating member for moving the barrier member to the closed position by the displacement of the urging means.

In the first configuration of the barrier opening / closing device, since the barrier member opens in front of the optical element such as a lens, when used as a camera, the barrier member itself exerts a hood effect at the time of photographing, so that a higher quality picture is obtained. It is possible to shoot
Moreover, the barrier opening / closing device itself can be reduced in size.

Further, since the barrier member is opened in front of the optical element, if the barrier member is provided in the lens barrel, no storage space for the barrier member is required inside the lens barrel, and the outer diameter of the lens barrel can be reduced even with a large opening. is there.

Furthermore, without using a special cam or screw,
With a small number of parts, it is possible to open and close the barrier member with a simple mechanism.

According to a second configuration of the barrier opening / closing device for realizing the object of the present invention, in the first configuration, the biasing means has a spring member having one end fixed and the other end free. When the action member elastically deforms the spring member toward the front, the tip of the spring member is displaced to move the barrier member in the closing direction.

According to a third aspect of the barrier opening / closing device for realizing the object of the present invention, in the above-mentioned first aspect, the biasing means is a spring member formed in an elliptical ring shape disposed on the front surface of the optical element. When both ends in the major axis direction of the spring member are pressed toward the optical axis center side by the action member, the barrier member is moved in the closing direction by displacement of the spring member in the minor axis direction. It was done.

In the second and third configurations of the barrier opening and closing device, one elastic member can be used in both directions of opening and closing the barrier, and the number of parts can be reduced.

According to a fourth aspect of the barrier opening / closing device for realizing the object of the present invention, in any one of the above-mentioned configurations, the barrier member is provided in a pair symmetrically with respect to the optical axis and disposed around the outer member. And a convex spherical surface substantially integral with the barrier member is formed in a closed state, and one of the mating sides opposed to each other in the closed state of the pair of barrier members is curved in a convex shape,
The other is concavely curved.

In the fourth configuration of the barrier opening / closing device, the tip of the barrier member when the barrier member is opened has an arc shape,
It is possible to effectively cut incident unnecessary light rays,
A higher hood effect is obtained. In addition, the gap between the barrier member and the exterior member can be reduced in both the state where the barrier member is opened and the state where the barrier member is closed, so that stray light entering the lens barrel through the gap is reduced, and ghost flare is reduced. Becomes possible.

A first configuration of a lens barrel realizing the object of the present invention has a barrier opening / closing device having any one of the above configurations at the front end.

A second structure of the lens barrel for realizing the object of the present invention is the same as the structure of the first lens barrel, except that the front lens holding frame for holding the front lens is an optical lens of the front lens. The zoom lens includes a zoom unit that extends to the image plane side from the design position and an insufficient extension, and a front group lens moving unit that can individually move the front lens holding frame with respect to other lens groups.

In the second configuration of the lens barrel, it is possible to change the effective hood length by changing the distance between the front lens group and the tip of the barrier member functioning as a hood. Condition) to obtain an optimum food effect.

According to a third configuration of the lens barrel for realizing the object of the present invention, in the configuration of the second lens barrel described above, the zooming means is configured such that the extending area for extending insufficiently extends near the short focal length end. It is assumed that.

In the third configuration of the lens barrel, the effective hood length near the wide-angle end can be shortened, and vignetting of light rays required for forming an image near the wide-angle end can be prevented. The effective hood length can be increased, and unnecessary light rays near the telephoto end can be more effectively cut.

A first configuration of a camera for realizing the object of the present invention has a lens barrel of the second or third configuration, a focal length detecting means for detecting a focal length, Storage means for storing difference information between the optical design position and the position of the front group lens detected by the focal length detection means; and a front group for detecting the extension position of the front group lens moved by the front group lens moving means. Lens position detection means, and the amount of extension of the front group lens based on front group lens position information from the front group lens position detection means, focal length information from the focal length detection means, and difference information from the storage means. And control means for controlling driving of the front group lens driving means.

In the first configuration of this camera, it is possible to correct the movement of the front lens group retracted from the optical design position to the film side by the zoom means to the optical design position.

According to a second configuration of the camera for realizing the object of the present invention, in the camera of the first configuration, the timing at which the control unit drives the front group lens is during a zooming operation.

In the second configuration of the camera, a zoom operation without a focus movement can be performed.

According to a third configuration of the camera for realizing the object of the present invention, in the camera of the first configuration, the timing for driving the front group lens by the control means is after the completion of the zooming operation.

In the third configuration of the camera, the actuator of the zoom means and the actuator of the front lens group moving means can be driven at different times, so that the camera can be driven with a small power supply.

According to a fourth configuration of the camera for realizing the object of the present invention, in the camera of the first configuration, the timing for driving the front group lens by the control means is during a focusing operation.

In the fourth configuration of this camera, the movement correction amount for correcting the front lens group retracted from the optical design position to the film side by the zoom means to the optical design position is included in one focusing movement amount. This makes the camera drive control procedure simple.

According to a fifth configuration of the camera for realizing the object of the present invention, in the camera having any one of the above-mentioned configurations, the barrier opening / closing device opens the barrier member fully open so as to be substantially parallel to the optical axis. Fully open means, and half open means for holding the barrier member in a half open state by tilting the barrier member to the optical axis side between a closed position and an open position; The half-opening means is operated on the long focal length side.

According to the fifth configuration of the camera, even with the same hood length, it is possible to prevent vignetting of light rays necessary for forming an image near the wide end, and to reduce unnecessary light rays near the tele end more efficiently. Can be cut into

According to a sixth aspect of the camera for realizing the object of the present invention, in the camera of the fifth aspect, the fully open means moves along the optical axis relative to the tip of the lens barrel. A straight-moving barrel, and a ring member located between the biasing means and the straight-moving barrel inside the lens barrel tip,
When the lens barrel changes from a non-photographing retracted state to a short focal length state capable of photographing, the linearly moving barrel is retracted from the ring member to fully open the barrier member, and the half-opening means includes a lens mirror. The lens barrel, which moves along the optical axis relative to the cylinder, and the ring member, when the lens barrel zooms to a long focal length state,
The lens frame presses the ring member to cause the barrier member to half-open.

In the sixth configuration of this camera, one ring member is used for both the full-opening and half-opening means of the barrier, the lens frame supporting the lens is used for the half-opening means, and the rectilinear barrel as the zoom member is used for the full-opening means. The number of parts can be reduced and the size can be reduced.

[0033]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) First, the appearance of a camera incorporating a barrier opening / closing device according to the present embodiment will be described.

FIGS. 1A to 1C are external views of a camera incorporating the barrier opening and closing device of the present embodiment in a wide state. Barrier member 401 arranged at the tip of the lens barrel
411 is opened, and the lens surface is exposed, and photographing is possible.

FIG. 2A shows a state in which the barrier members 401 and 411 at the distal end of the lens barrel are closed in the collapsed state. In the retracted state without using the camera, the barrier member 40 is not used as shown in FIG.
Reference numeral 1 411 closes and covers the lens surface. A front decorative plate 406 as a decorative member, which is an exterior member, is arranged around the barrier members 401 and 411. The outer surfaces of the barrier members 401 and 411 and the front decorative plate 406 have cylindrical surfaces having the same curvature.

When the barrier members 401 and 411 are closed, the upper boundary between the barrier member 401 and the front decorative plate 406 is substantially the same as the outer surface curvature of the barrier member.
-Even in the state where the barrier members 401 and 411 in (d) are open, a large gap does not occur at the boundary between the barrier member 401 and the front decorative plate 406.

Next, the barrier opening / closing device of this embodiment will be described. FIG. 4 is a drawing that well illustrates the features of the present embodiment. FIG. 4A is a perspective view showing a state where the barrier member is closed.

The barrier member 401 is formed of a curved surface having a cylindrical curvature. At both ends of the barrier member 401, a rotation shaft 401a serving as a rotation center for opening and closing the barrier member 401 in front of the lens barrel, and a spring 402 described later near the rotation shaft 401a. It has a hole 401a to be fitted. The inner surface is coated with an antireflection paint.

The spring 402 is provided in the hole 4 of the barrier member 401.
01b, a protruding portion 402b that comes into contact with a rectilinear barrel described later, and a fixing portion 402c that is fixed with a screw 403 described later.

The tip barrel 404 is located at the tip of the lens barrel, and includes a bearing 404a for rotatably fixing the rotating shaft 401a of the barrier member 401, a spring receiving portion 404c for fixing the spring 402, and a spring 404c. It has a hole portion 404b for releasing the convex portion and an adhesive surface 404d for adhesively fixing the front decorative plate 406 described above. The screw 403 fixes the spring 402 to the spring receiving portion 404c of the tip barrel.

The front decorative plate 406 (only the lower left is shown in FIGS. 4A and 4B) is a rotary shaft 401a of the barrier member 401.
406a (see FIG. 5 (b)) for rotatably fixing the lens, a barrel-shaped opening 406b for passing a light beam necessary for image formation, and a hole 4 for releasing the barrier member 401.
06c and the adhesive surface 40 that is adhesively fixed to the tip barrel 404.
6d. The surface has a cylindrical shape as described above.

The rectilinear barrel 405 is disposed on the inner surface of the distal barrel 404, and has a convex portion 405b that pushes the convex portion of the spring toward the subject in the collapsed state.

When the lens barrel is in the photographing state between wide and telephoto, as shown in FIG.
Is biased to rotate in the opening direction because the spring insertion hole portion 401b is located on the outer periphery of the rotating shaft portion 401a (see FIG. 6B). ). The barrier member 401 is always opened up and down by the elastic force of this spring.

Next, when the switch of the camera is turned off,
The lens barrel changes to a collapsed state. At that time, the rectilinear barrel 405 approaches the tip barrel 404 and the convex portion 40 of the rectilinear barrel 405
5b tries to push the convex portion 405b of the spring 402 forward of the tip barrel 404. As a result, the distal end portion 402a of the spring 402 is also pushed forward of the distal lens barrel 404.

Since the fitting hole 401b of the spring 402 exists on the outer periphery of the rotating shaft 401a, the barrier member 401 rotates in the closing direction, and the barrier member 401 closes (FIG. 5).
(B)). Here, the barrier members 401 and 411 may be elastic members such as hard rubber.

According to the present embodiment, the following effects can be obtained.

Since a thin wire spring is used for the urging means,
The space used is small, miniaturization and component cost can be reduced.

Since the antireflection paint is applied to the inner surface of the barrier member, the reflection on the inner surface can be reduced, and a higher quality photograph can be taken.

Since the barrier member has a curvature, the hood effect at a portion near the upper and lower diagonals is higher than that of a flat barrier member.

Since the boundary between the front decorative panel and the barrier member, which is closer to and parallel to the axis of rotation of the barrier member, is almost the same as the curvature of the outer surface of the barrier member, the boundary member is open and closed regardless of whether the barrier member is open or closed. The gap at the boundary is small, and stray light entering the lens barrel from the gap can be reduced. Thus, light leakage to the film surface during non-shooting and ghost flare during shooting can be reduced. Since the barrier member opens up and down, the upper barrier member prevents sunlight from above from entering the front lens surface, and can prevent flare and ghost.

Further, the upper barrier member prevents rain and snow from adhering to the lens surface, so that the image quality of the photograph does not deteriorate. The lower barrier member prevents unnecessary rays from below, such as the reflected light of the sun on the water surface, from being incident on the lens surface at the tip, and can prevent flare and ghost. When the barrier member is an elastic member such as hard rubber, when the camera falls and the lens barrel comes in contact with the ground first, the barrier member first contacts the ground and the barrier is closed. Due to its own deformation, the shock is absorbed, and damage to the lens barrel and body is reduced.

(Second Embodiment) FIGS. 7 and 8 show a second embodiment of the present invention.

The barrier opening / closing device according to the present embodiment will be described with reference to FIG.

The barrier member 711 has a flat barrier surface portion, and is disposed in a pair at the top and bottom so as to be openable and closable in front of the lens barrel via a rotation shaft portion 701a which is a rotation center provided at the base of the barrier member 711. I have.

Further, a gear portion 711b is provided on the outer periphery of the rotating shaft portion 701a so as to mesh with a rack portion 702a of a spring described later. The inner surface is a light-shielding line 711 for preventing reflection.
c is engraved.

The spring 702 is an elastic member entirely formed in a substantially elliptical ring shape when viewed from the front.
A pair of rack portions 702a that mesh with the first gear portion 711b and open and close the barrier member 711 are provided in a pair of upper and lower sides along the elliptical minor axis. Along the left and right.

The tip barrel 704 is located at the tip of the lens barrel, bearings 704a and 704b for rotatably fixing the rotating shaft 711a of the barrier member 711, and a holding portion 704c for rotatably holding a link described later.・ It has 704d.

A link 714 is provided for the holding portion 7 of the tip barrel 704.
Rotation center 71 rotatably held at 04c / 704d
4a, ball portion 7 fitted in hole 702c of spring 702
11c, and has a contact portion 714b pushed by a tip 705a of a rectilinear cylinder described later. Note that the link 715 is also the link 7
This is the same mechanism as in FIG.

The rectilinear barrel 705 has a tip 705 that contacts the contact portions 714b and 715b of the links 714 and 715.

Next, referring to FIG. 7 and FIG.
The operation of closing from the open state of 11 will be described.

When the switch of the camera is turned off, the straight-moving barrel 705 of the lens barrel is moved, as shown in FIG.
Approaching 4 At this time, the tip 705 of the straight moving cylinder
a is a contact portion 714b / 715 of the link 714/715.
Press b.

The pressed links 714 and 715 rotate around their rotation centers 714a and 715a, and
c · 715c approaches the optical axis O. Links 714 and 715
The holes 702c and 702d of the spring 702, into which the spherical portions 714c and 715c are fitted, are close to the optical axis.
As the left and right are compressed along the elliptical major axis direction, the vertical spreads along the elliptical minor axis direction.

The rack portions 7 arranged above and below the spring 702
02a moves downward, so that the rack portion 702a
The gear portion 711b of the barrier member 711 fitted in the first member rotates, and the barrier member 711 closes. The barrier member 701 is closed by the same operation.

When the switch of the camera is turned on, the rectilinear barrel 705 moves away from the tip barrel 704 as shown in FIG. 7C. At this time, the contact portions 714b / 71 of the links 714/715 pressed by the tip 705a of the rectilinear cylinder
5b becomes free.

At this time, the spring 702 attempts to return to a free shape as shown in FIG.
702d is spread right and left, and links 714 and 715 are shown in FIG.
Return to the position of (c).

Since the rack portion 702a of the spring 702 narrows up and down, the rack portion 702a moves upward, and the gear portion 7 of the barrier member 711 fitted with the rack portion 702a.
11b rotates, and the barrier member 711 opens. The barrier member 701 shown by the broken line opens by the same operation.

According to the above-described embodiment, the following effects can be obtained.

Since the upper and lower barrier members are urged by one spring in the direction to open the barrier, the number of parts can be reduced.

Since the spring is an elastic member, even if an external force is applied in a direction to close the open barrier, the external force can be absorbed and damage to the barrier opening / closing device can be prevented.

Since the light-shielding line is provided on the inner surface of the barrier member, the reflection on the inner surface can be reduced, and a higher quality photograph can be taken.

(Third Embodiment) FIGS. 9 to 11 and FIG. 15 show a third embodiment of the present invention.

The structure of the camera according to the present embodiment will be described with reference to FIG. The lens barrel provided in the camera according to the present embodiment is a two-unit zoom lens, and is a three-stage barrel pulled out by a zoom motor. In addition, one group is moved out of focus by a focus motor (not shown) arranged in the distal end lens barrel.

The tip barrel 904 is located at the tip of a three-stage barrel that is fed by a cam and a cam pin.

The fixed barrel 929 is fixed to the body 930. The third barrel 927, which is rotated and fed by the zoom motor on the inner surface of the fixed barrel 929, is fitted to the inner surface of the third barrel. There is a third rectilinear advancing barrel 928 which is unrotated with the three barrels.

On the front side of the third lens barrel, there is a second lens barrel 925 that is rotatably extended with respect to the third lens barrel, and a straight-moving cylinder that is disposed on the inner surface and is unrotated with the second lens barrel.

At the distal end of the second lens barrel, a distal lens barrel 904 is provided so as to be extended without rotation. The barrier opening / closing device described in the first embodiment is disposed in front of the distal lens barrel. Have been.

Next, the operation of the present embodiment having the above configuration will be described below with reference to the block diagram shown in FIG.

When the camera is switched off in the retracted state shown in FIG. 9, the barrier opening / closing device is closed by pressing the rectilinear barrel 926. Now, when the switch of the camera is turned on, the zoom motor 931 rotates to change from the state shown in FIG. 9 to the wide state shown in FIG. 10, and the rectilinear barrel is relatively separated from the tip barrel 904, and the upper spring 902 and the lower spring 912 The barrier opening and closing device is opened by the restoration of.

Similarly, by the rotation of the zoom motor 931, the second group frame 922 is zoomed to the optically designed position at the wide end, and the first group frame 921 is zoomed to the insufficiently extended position on the film surface side from the optically designed position. .

At this time, the focal length detecting means 1101 detects that the zoom lens is at the wide-angle end, and determines from the storage means 1102 the amount of shortage of the first lens group at the wide-angle end.
Tell 105.

Here, when a release is performed to take a picture, the subject distance information measured by the distance measuring means 1104 is transmitted to the one-group lens control means 1105.

The first-group lens position detecting means 1103 detects the current position of the first-group frame in the front-end barrel 904 and transmits the detected position to the first-group lens control means 1105.

The first-group lens control means 1105 calculates the amount of extension of the first-group frame 921 for focusing from the current position of the first-group lens, the insufficient extension of the first-group frame 921, and the subject distance information.

The amount of extension of the first group frame is transmitted to the first lens driving means 1106, and the first lens driving means 1106 advances the first frame 921.

Then, the film surface is exposed, the film is wound, and the first group frame 92 is driven by the first lens driving means 1106.
Return 1 to the initial position.

FIG. 11 shows an infinite shooting state at the wide end.
Since the first group frame extends to the subject side with respect to the barrier opening / closing device, the incident light beam end SW for forming an image passes close to the tip of the barrier members 901 and 911 without vignetting.

Next, when zooming to the telephoto end, the zoom motor 931 rotates to change from the telephoto end state shown in FIG. 10 to the telephoto end state, and the first group frame 921 and the second group frame 922 zoom to the optical design position at the telephoto end. Is done.

The position of the first group frame with respect to the barrier opening / closing device is retracted toward the film surface from the time of widening.
The incident light beam end ST for forming an image is located at the barrier member 901.9.
11 near the tip.

According to the above-described embodiment, the following effects can be obtained.

In the case of the hood device, when the lens is wide, the group is extended toward the object side, when telephoto, the position where the lens is retracted toward the film surface is defined as an infinite position. By shortening the length, the effective light rays that form the image are prevented from vignetting by the hood,
In telephoto, by increasing the effective hood length, more harmful light rays can be cut, and high-quality photos can be taken.

Further, since the barrier member is driven only in the two states of the open state and the closed state, the opening and closing mechanism of the barrier opening and closing device can be simplified and downsized.

(Fourth Embodiment) FIGS. 12 to 14 show a fourth embodiment of the present invention.

The structure of the camera according to the present embodiment will be described with reference to FIG. The lens barrel provided in the camera of the present embodiment is a two-stage zoom lens, and is a three-stage lens barrel that alternately performs zooming and focusing by one motor.

The barrier opening / closing device has substantially the same configuration as that of the first embodiment, and different points will be described.

The ring member 1031 includes a tip barrel 1004
Slide-fit in the optical axis direction inward of the
6 and the second group frame are pressed forward by the convex portion 1022a.

The second group frame 1022 has, on the outer periphery, a convex portion 1022a for pressing the ring member 1031.

Next, the operation of the camera at the time of zooming from the retracted position to the wide position and to the telephoto position will be described.

When the camera is switched off and the retracted position shown in FIG.
031 is pressed toward the subject, and the ring member 1031 pushes the convex portion 1012b of the spring toward the subject, whereby the barrier member 1011 is closed. At this time, the barrier member 1001 is closed by the same operation.

Now, when the switch of the camera is turned on, the camera enters a wide state as shown in FIG. 13, and the rectilinear barrel 1026 moves relatively backward with respect to the tip barrel 1004, and the deformed spring 1012 is moved. Returning to the original state, the ring member 1031 is pushed to the film surface side by the convex portion 1012b of the spring 1012 and then stops at a position where no force is applied from the other.

When the spring 1012 returns to the original shape, the barrier members 1011 and 1001 open.

Since the barrier members 1011 and 1001 are in the fully opened state, the incident light beam end SW for forming an image passes close to the ends of the barrier members 1011 and 1001 without vignetting.

Next, when the tele end state shown in FIG. 14 is attained by zooming, the second group frame 1022 comes closest to the first group frame 1021, and the convex portion 1022a of the second group frame presses the ring member 1031 toward the subject.

The convex portion 1012b of the spring 1012 is pushed out toward the subject by the pressing of the ring member 1031. Since the amount of pressing movement at this time is smaller than the amount of pressing movement by the rectilinear cylinder, the barrier members 1011 and 1001 are opened halfway. Stop at the position.

Since the barrier members 1011 and 1001 are half-open, the incident light beam end ST for forming an image is
It passes near the front end of 1 · 1001.

Thereafter, when zooming from the telephoto end to the wide side, the convex portion 1022a of the second group frame relatively moves to the film surface side, and the ring member 10 having no object to be pressed is removed.
31 is a projection of the spring 1012 due to the restoring force of the spring.
At 12b, it is pushed toward the film surface and moves. Due to the restoring force of the spring, the barrier members 1011 and 1001 are fully opened, and the incident light rays for forming an image are not quenched.

According to the above-described embodiment, the following effects can be obtained.

The barrier member of the barrier opening / closing device is fully opened at the intermediate focal length from the wide end to prevent vignetting of the effective light rays for forming an image from the hood. By making the opening angle of the member half-open, more harmful light rays can be cut, and a high-quality photograph can be taken.

Further, since the opening angle of the hood member is mechanically controlled in the lens barrel, the contents of the electric control can be simplified without burdening the electric control circuit inside the camera.

[0109]

According to the first and fifth aspects of the present invention, since the barrier member is opened forward, when used in a camera provided in the lens barrel, the barrier member itself exerts a hood effect at the time of photographing, resulting in higher image quality. In addition, it is possible to take various pictures, and it is possible to reduce the size of the barrier opening / closing device itself.

Further, since the barrier member is opened to the front of the lens barrel, a storage space for the barrier member inside the lens barrel becomes unnecessary, and the outer diameter of the lens barrel can be reduced even with a large opening. Further, it is possible to open and close the barrier with a simple mechanism with a small number of parts without using a dedicated cam or screw.
Since the urging means constantly urges the barrier to open, the barrier member closes when pressed with a finger or the like, preventing fingerprints from adhering to the lens surface and preventing the image quality of the photograph from deteriorating.
Also, when receiving an impact such as dropping, the barrier member closes,
Since the urging means partially absorbs the impact force, the damage of the barrier member is small.

According to the second and third aspects of the present invention, one elastic member can be used in both directions of opening and closing the barrier, and the number of parts can be reduced.

According to the fourth aspect of the present invention, when the barrier member is opened, the tip of the barrier member has an arc shape, so that it is possible to effectively cut unnecessary incident light rays, and a higher hood effect is obtained. .

According to the sixth aspect of the present invention, the effective hood length can be changed by changing the distance between the front lens group and the tip of the hood, and the optimum hood effect can be obtained at each focal length (= each zoom state). Can be obtained.

According to the seventh aspect of the present invention, the effective hood length near the wide end can be shortened, and the vignetting of light beams required for forming an image near the wide end can be prevented. The effective hood length can be increased, and unnecessary light rays near the telephoto end can be more effectively cut.

According to the eighth aspect of the present invention, it is possible to correct the movement of the front lens group, which is retracted toward the film side from the optical design position by the zoom means, to the optical design position.

According to the ninth aspect, a zoom operation without a focus movement can be performed.

According to the tenth aspect, since the actuator of the zoom means and the actuator of the front lens group moving means can be driven at different times, it is possible to drive the camera with a small power supply.

According to the eleventh aspect of the present invention, the amount of movement correction for correcting the front lens group retracted from the optical design position to the film side by the zoom means to the optical design position is:
Since it can be included in one focusing movement amount, the drive control procedure of the camera is simplified.

According to the twelfth aspect, even with the same hood length, it is possible to prevent vignetting of light rays necessary for forming an image near the wide end, and to reduce unnecessary light rays near the tele end more efficiently. Can be cut.

According to the thirteenth aspect of the present invention, one ring member is used for both the fully open and half open means of the barrier, the lens frame for supporting the lens is used for the half open means, and the rectilinear barrel as the zoom member is used for the full open means. The number of parts can be reduced and the size can be reduced.

[Brief description of the drawings]

FIG. 1 shows the appearance of a camera incorporating a barrier opening / closing device according to a first embodiment of the present invention, where (a) is a top view in a wide state, (b) is a front view in a wide end state, and (c). ) Is a side view in the wide end state, and (d) is a side view in the tele end state.

2A and 2B show the appearance of a camera incorporating the barrier opening / closing device according to the first embodiment of the present invention, wherein FIG. 2A is a top view in a collapsed state, FIG. 2B is a front view in a collapsed state, and FIG. Is a side view of the collapsed state

FIGS. 3A and 3B are enlarged views of the tip of the lens barrel according to the first embodiment of the present invention, wherein FIG. 3A is a perspective view of a state in which a barrier is closed, and FIG. , (C) is a front view with the barrier closed, and (d) is a front view with the barrier open.

FIG. 4 is an enlarged perspective view of a part of the front end of the lens barrel according to the first embodiment of the present invention, in which a part of the lens is broken.
Indicates a state where the barrier is closed, and (b) indicates a state where the barrier is open.

FIGS. 5A and 5B are enlarged views of a part of the tip of the lens barrel according to the first embodiment of the present invention, in which some parts are broken, FIG. 5A is a front view in a state where a barrier is closed, and FIG. Side view with barrier closed

FIGS. 6A and 6B are enlarged views of the lens barrel according to the first embodiment of the present invention, in which some parts at the tip of the lens barrel are broken, FIG. 6A is a front view with a barrier opened, and FIG. Side view with barrier open

FIGS. 7A and 7B are enlarged views of a tip of a lens barrel according to a second embodiment of the present invention, wherein FIG. 7A is a front view in which a barrier is open, and FIG. 7B is a view in which the barrier is open. Side view,
(C) is a top view with the barrier open

FIGS. 8A and 8B are enlarged views of the distal end of the lens barrel according to the second embodiment of the present invention, wherein FIG. 8A is a front view showing a state in which a barrier is closed, and FIG. Side view, (c) Top view with barrier closed

FIG. 9 is a side sectional view showing a collapsed state of a camera according to a third embodiment of the present invention.

FIG. 10 is a side sectional view showing a wide end state of a camera according to a third embodiment of the present invention.

FIG. 11 is a side sectional view showing a tele end state of a camera according to a third embodiment of the present invention.

FIG. 12 is a sectional view showing a collapsed state side of a camera according to a fourth embodiment of the present invention.

FIG. 13 is a sectional view showing a wide end state of a camera according to a fourth embodiment of the present invention.

FIG. 14 is a sectional view showing a tele end state of a camera according to a fourth embodiment of the present invention.

FIG. 15 is a flowchart illustrating control of zooming and focusing of the camera according to the third embodiment of the present invention.

[Explanation of symbols]

 Reference numeral 401: Upper barrier member, 411: Lower barrier member, 402: Upper spring 402a: Tip portion 402b: Convex portion 402c: Fixing portion 412: Lower spring 403: Screw 413: Screw 404: Tip barrel 405: Straight barrel 406 ... front decorative plate 701 ... barrier member 702 ... spring 702a ... rack 702b ... rack 702c ... hole 704 ... tip barrel 704a ... bearing 704b ... bearing 704c ... holding 704d ... holding 705 ... Tip 706 Front decorative panel 711 Barrier member 711a Rotating shaft 711b Gear 711c Light blocking line 714 Link 714a Rotation center 714b Contact part 714c Ball part 715 Link 715a Rotation center 715b Contact part 715 c sphere portion 901 upper barrier member 902 upper spring 04 ... Tip barrel 906 ... Front decorative board 911 ... Lower barrier member 912 ... Lower spring 921 ... Group frame 921a ... Nut part 922 ... Group 2 frame 923 ... Feed screw 926 ... Straight barrel 924 ... Spring 925 ... Second mirror Cylinder 927: Third lens barrel 928: Third rectilinear barrel 929: Fixed cylinder 930: Body 931: Zoom motor SW: Incident light beam end forming an image at the wide end ST ... Incident light end forming an image at the tele end 1001 Upper barrier member 1002 Upper spring 1004 Tip barrel 1011 Lower barrier member 1012 Lower spring 1012b Convex part 1021 First group frame 1022 Second group frame 1022a Convex part 1026 Linear member 1031 Ring member 1101 Focal length detecting means 1102 ... Storage means 1103 ... Group lens position detecting means 1104 ... Distance measuring means 1105 ... Group lens control means 1106 ... Group lens drive means

Claims (13)

[Claims] A barrier supporting means for movably supporting the barrier member between a closed position covering the front surface of the optical element and an open position substantially along the optical axis of the optical element; An urging means for moving the barrier member to the closed position, the urging means moving the barrier member to the closed position by a displacement of the urging means caused by the elastic deformation. A barrier opening and closing device characterized by the following. 2. The urging means is constituted by a spring member having one end fixed and the other end free, and when the action member elastically deforms the spring member forward, The barrier opening / closing device according to claim 1, wherein a tip of a spring member is displaced to move the barrier member in a closing direction. 3. The biasing means is constituted by a spring member formed in an elliptical ring shape disposed on the front surface of the optical element, and both ends of the spring member in the major axis direction are centered on the optical axis by the action member. The barrier opening / closing device according to claim 1, wherein when pressed to the side, the barrier member is moved in a closing direction by displacement of the spring member in a short axis direction. 4. The barrier member is provided in a pair symmetrically with respect to an optical axis, and has a convex spherical surface substantially integrated with an exterior member disposed therearound in a closed state of the barrier member.
4. The barrier opening / closing device according to claim 1, wherein one of the mating sides of the pair of barrier members facing each other in the closed state is curved in a convex shape, and the other is curved in a concave shape. 5. A lens barrel comprising the barrier opening / closing device according to claim 1, 2, 3 or 4 at a front end. 6. A zoom means for extending a front lens holding frame for holding the front lens to the image plane side from an optical design position of the front lens and insufficiently extending the front lens holding frame to another lens group. 6. The lens barrel according to claim 5, further comprising a front group lens moving unit that is individually movable with respect to the lens barrel. 7. The lens barrel according to claim 6, wherein the extension area of the zoom unit that extends to insufficient extension is near a short focal length end. 8. A focal length detecting means having the lens barrel according to claim 6 and detecting a focal length, and an optical design position of the front group lens and the front detected by the focal length detecting means. A storage unit that stores difference information from the position of the group lens, a front group lens position detection unit that detects an extension position of the front group lens that is moved by the front group lens movement unit, and a front group lens position detection unit. Calculating the extension amount of the front group lens based on the front group lens position information, the focal length information from the focal length detecting means, and the difference information from the storage means, and controlling the driving means of the front group lens. A camera comprising: 9. The camera according to claim 8, wherein the control unit drives the front lens unit during a zooming operation. 10. The camera according to claim 8, wherein a timing of driving the front lens group by the control means is after completion of a zooming operation. 11. The camera according to claim 8, wherein a timing of driving the front lens group by the control means is in a focusing operation. 12. The barrier opening / closing device, wherein the barrier member is fully opened so as to be substantially parallel to the optical axis, and the barrier member is tilted toward the optical axis between a closed position and an open position. A half-opening means for holding the half-opened state, wherein the full-opening means is operated from the short focal length side to the intermediate focal length, and the half-opening means is operated from the long focal length side. The camera according to claim 8, 9, 10, or 11. 13. The lens barrel according to claim 1, wherein the fully-opening means is provided between the urging means and the rectilinear barrel inside the lens barrel, the linear barrel moving along the optical axis relative to the tip of the lens barrel. When the lens barrel is in a short focal length state capable of photographing from a non-photographing retracted state, the linearly moving barrel retracts from the ring member to fully open the barrier member. The half-opening means includes a lens frame that moves relatively along the optical axis with respect to the lens barrel, and the ring member, and when the lens barrel zooms to a long focal length state, the lens opens. 13. The camera according to claim 12, wherein a frame presses the ring member to half-open the barrier member.