JP2538070B2 - Camera lens barrier device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens barrier device for a camera provided on the front surface of a lens for protecting a taking lens, and more particularly, a lens driving member for driving the lens can directly open and close the lens barrier device. The present invention relates to a lens barrier device of a controlled camera.

2. Description of the Related Art In recent years, in the field of compact cameras, the size of the camera itself has been further reduced, and the photographic optical system that can set multiple focal lengths and has a zoom lens has become popular. There is.

Therefore, a lens barrier device for protecting the taking lens is also disclosed in, for example, Japanese Utility Model Laid-Open No. Sho 62-193228, Japanese Patent Laid-Open No. Sho 63-95426 or Japanese Patent Laid-Open No. Kaisho 63-194213
As disclosed in Japanese Patent Laid-Open Publication No. 2005-242242, it has come to be installed in the lens barrel rather than on the camera body side.

The first proposal is to rotate the photographing lens holding frame between the rearmost photographable position and the storage position further rearward, that is, to move the retractable section by moving the photographing lens holding frame. A lens barrier mechanism is disclosed that opens and closes the lens barrier in conjunction with the rotation operation of the control section following the collapsing section.

That is, the lens driving member is provided with a closing protrusion capable of controlling the rotation of the interlocking lever as appropriate, and the interlocking lever is pivoted during the movement operation of the lens driving member for moving the lens to the section following the retractable section, thereby to move the lens barrier. The barrier-closed state is obtained by moving the lens barrier drive member, which normally biases the lens in the opening direction, against the biasing force.

The following proposal proposes a lens cover opening / closing means for controlling the operation of the lens cover by moving the interlocking member that interlocks the focal length switching mechanism with the motor from one end to a predetermined intermediate position, and the intermediate position and the other end. There is disclosed a camera provided with a cooperation means for operating the focal length switching mechanism.

That is, the operation pin provided on the lens driving member, which is the interlocking member, is directly associated with the lens cover driving member that normally urges the lens cover in the opening direction, and the lens driving member is operated in a straight line or a part of a rotational movement range. Configured so that the pin and lens cover drive member can work together,
With this configuration, the lens cover is opened and closed.

The last proposal is to connect the lens moving cam groove for moving the moving frame to which the lens group is fixed, which is formed in the electrically driven zoom driving frame, to move the moving frame backward. There is disclosed a zoom lens barrel including a storage cam groove portion and a barrier drive member that controls opening and closing of a lens barrier in conjunction with a cam pin that moves in the storage cam groove portion.

That is, it has a barrier drive lever that comes into contact with the cam pin that has moved into the storage cam groove, and this barrier drive lever controls the operation of the driven lever fixed to the drive plate that drives the barrier to open the barrier. Or it is getting closed.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In each of the conventional lens barrier devices disclosed in the above proposals, the lens barrier device is arranged in the lens barrel portion, and the opening and closing of the lens barrier device operates the lens driving member for moving the lens. In response to a large protrusion of the lens barrel from the camera body.

However, when the opening / closing structure of the lens barrier is examined in more detail, it still has the following disadvantages.

The first and the last proposed devices each include an appropriate interlocking lever for moving the lens barrier driving member, or a barrier driving lever, that is, since the intermediate member is used,
A storage space inside the lens barrel is required, and there is a disadvantage that the lens barrel becomes large.

Further, since the transmission of the driving force of the electric drive source to the barrier is transmitted through the intermediate member, there is some concern about obtaining a reliable barrier opening / closing operation with high accuracy. In particular, the last proposal is that the formation range of the cam grooves formed in the zoom drive frame has been limited to a narrow range due to the fact that macro functions and collapsible mechanisms have become common in recent years and there is a strong demand for further miniaturization. Considering the above, it will be more and more difficult to obtain a reliable barrier opening / closing operation.

On the other hand, the second proposed device directly drives and controls the lens cover driving member with the operation pin provided on the lens driving member that moves straight or rotationally. No intermediate member is required, but it is necessary to provide a space in the lens barrel in consideration of the movement locus of the operation pin based on the movement of the lens driving member. It has a disadvantage that it becomes large in size. Incidentally, for example, it may be possible to form an appropriate escape groove in the moving frame or the like to form a space in consideration of the movement locus of the previous operation pin and prevent the increase in size to some extent, but in this case there is a risk of light leakage newly. In addition, it is considered that there is a problem in that processing becomes complicated and the like, and it is not particularly preferable for practical use.

The present invention has been made in consideration of the various points described above. The lens drive member directly controls the drive of the barrier drive member, and the two members are interlocked via the elastic force of the elastic member to ensure the reliability. It is an object of the present invention to provide a lens barrier device for a camera that can accurately perform various barrier opening / closing operations and prevent the lens barrel from increasing in size.

Means for Solving the Problems A lens barrier device for a camera according to the present invention includes a cam groove that engages with a cam pin provided on a plurality of moving frames that hold a lens group, and moves the moving frame in the optical axis direction. A lens drive member, a barrier drive member having a lens barrier and a cam portion that comes into contact with an opening / closing pin provided on the lens barrier, can be rotated about appropriate positions, respectively, and can be located in front of the foremost moving frame. And a barrier holding means which is integrally provided with the foremost moving frame and which is inscribed in the lens driving member, a frame body, an elastic member housed in the frame body, and a frame body. Along with the elastic member, the tip of the click pin is always urged to protrude outside the frame body,
The first driving means is formed on one of the lens driving member and the barrier driving member, and the first driving means of both members is formed on the side where the first driving means is not formed. The engaging hole that engages with the click pin of the first engaging means only until it moves from the reference position to the predetermined position and transmits the mechanical output when the lens driving member is driven to the barrier driving member. And a certain second engaging means.

Action Since the lens barrier device of the camera according to the present invention is configured as described above, the first engagement means and the second engagement means are provided until the lens driving member is rotationally moved from the reference position before photographing to a predetermined position. Therefore, the mechanical output due to the rotational movement of the lens driving member is directly transmitted to the barrier driving member during the above period, and the barrier driving member also rotates in conjunction with the above. The opening / closing operation of the barrier is controlled by the relationship between the opening / closing pin provided on the lens barrier and the cam portion of the barrier driving member.

On the other hand, when the lens driving member is rotationally moved beyond the predetermined position, the engagement between the first engaging means and the second engaging means is released, and the click pin is attached by the elastic member between the two members. The lens drive member and the barrier drive member are in a state of being housed in the frame against the power, that is, the lens drive member and the barrier drive member are independent from each other, and the mechanical output is not transmitted to the barrier drive member. It does not rotate in conjunction with, and the opening / closing operation of the barrier is not controlled.

Examples Examples of the lens barrier device for a camera according to the present invention will be described below.

FIG. 1 is a schematic exploded perspective view of essential parts showing an embodiment of a lens barrier device for a camera according to the present invention.

The barrier cylinder 1 has a hollow cylindrical shape having a front opening 1a and a rear opening 1b, and inside the front opening 1a side, the lens barriers 2 and 3, and the opening / closing pins 2a that are set up in the lens barriers 2 and 3, respectively. , 3a, and a barrier ring 4 which is a barrier driving member having cam portions 4a, 4b that come into contact with the springs 5a, 5b for constantly urging the lens barriers 2, 3 in the opening direction.
Via, that is, a barrier holding means is formed.

The opening / closing pins 2a and 3a set on the lens barriers 2 and 3
The contact between the cam portions 4a and 4b of the barrier ring 4 and the cam portions 4a and 4b of the barrier ring 4 is performed through the insertion holes 6c and 6d of the barrier base 6, while the lens barriers 2 and 3 are opened and closed. It is controlled by the state change of the contact due to the rotation of the barrier ring 4.

The lens barriers 2 and 3 and the barrier ring 4 are
The shafts 6a, 6b set up on the barrier table 6 or the optical axis L are held so as to be rotatable.

Further, the barrier cylinder 1 has a zooming cam 11 which will be described later.
The frontmost moving frame among a plurality of moving frames (not shown) holding a lens group that is inscribed inside and that is moved by the zooming cam 11 is integrally built in, and this moving It moves straight forward and backward along the optical axis L together with the front moving frame.

The barrier ring 4 is integrally provided with an extension arm 4c led out rearward along the inner peripheral surface of the barrier cylinder 1, and further, a first engaging means 10 is formed at a tip end portion of the extension arm 4c. .

The first engaging means 10 is, as shown in FIG. 2 (a), a partial sectional view of the periphery thereof in the assembled state, the frame body 7, and the spring 8 which is an elastic member accommodated in the frame body 7. And a click pin 9 housed in the frame body 7 and urged by the spring 8 so that the tip 9a thereof always projects outside the frame body 7.

The first engaging means 10 is provided on the barrier cylinder 1 as is apparent from FIG. 2 (b) which is a partial view from the direction of arrow A in the assembled state and FIG. 2 (a) above. Located in the notch 1c, the barrier ring 4 rotates first
The engagement means 10 and both ends 1d and 1e of the cutout portion 1c are brought into contact with each other so that the range is appropriately controlled. As is apparent from FIG. 2 (a), the tip 9a of the click pin 9 of the first engaging means 10 is formed in a spherical shape and is also projected from the outer peripheral surface of the barrier cylinder 1. There is.

The zooming cam 11, which is a lens driving member for moving a plurality of moving frames (not shown) holding the lens group in the optical axis L direction, has a hollow cylindrical shape, and is associated with a cam pin provided in each of the moving frames. Multiple cam grooves 11a, 11b that fit together
Etc. and the tip of the click pin 9 of the first engaging means 10 described above.
9a is formed with an engaging hole 12 which is a second engaging means capable of engaging only in a predetermined state. Further, as is apparent from FIG. 2 (a), the barrier cylinder 1 described above is inscribed. To be done.

Now, in the case where the engagement hole 12 and the tip portion 9a of the click pin 9 are engaged with each other, as shown in FIG. 2 (a), the barrier ring 4 is mechanically moved during the rotational movement of the zooming cam 11. The output is directly transmitted, and thus the barrier ring 4
Can rotate in conjunction with the barrier ring 4.

However, the rotation of the first engaging means 10 as described above.
The zooming cam 11 is controlled by the relationship between the
If the amount of rotational movement of the click pin exceeds the control range based on the above relation, the engagement is released by the movement of the click pin 9 against the biasing force of the spring 8, that is, the supply of the mechanical output is stopped. The interlocking relationship between the barrier ring 4 and the zooming cam 11 is lost.

On the other hand, in order to perform the opening / closing operation of the lens barriers 2 and 3 with high accuracy, it goes without saying that it is necessary to perform the opening / closing operation within the control range where the zooming cam 11 can directly control the barrier ring 4. Therefore, in the present invention, the necessity of the shape of the cutout portion 1c that defines the control range and the shape of the cam portions 4a and 4b that contact the opening / closing pins 2a and 3a of the lens barriers 2 and 3 are considered. Then, the lens barriers 2, 3 are opened and closed surely by the setting, that is, the rotation of the barrier ring 4 within the above control range.

Further, it goes without saying that it is desired that the opening / closing operation of the lens barriers 2 and 3 is performed at a time point not related to photographing, and in the present invention, the above-mentioned control range is set to the zooming cam.
Reference numeral 11 is matched with an appropriate range including the entire moving section from the reference position before shooting to setting the lens at the wide end.

That is, the engagement hole 12 described above is the same as the zooming cam 11
Is formed in a position and shape that can maintain the engagement state with the tip end portion 9a of the click pin 9 only within an appropriate range including the entire movement range from the reference position before shooting to setting the lens to the wide end. That is why.

The operation of the embodiment shown in FIG. 1 will be described below with reference to FIGS. 3 (a) and 3 (b).

FIGS. 3 (a) and 3 (b) are schematic plan views of essential parts in an assembled state of the embodiment of the lens barrier device according to the present invention shown in FIG. 1, and FIG. 3 (a) is shown in FIG. In the closed state corresponding to the illustrated state, the figure (b) shows the open state.

Now, the lens barrier device according to the present invention is shown in FIG.
As is clear from the figure, the opening / closing pin 2 for the lens barriers 2 and 3
The barrier ring 4 is rotated until a contact between the cam portions 4a, 4b and the cam portions 4a, 4b is made to occur, that is, the lens barriers 2, 3 oppose the biasing forces of the springs 5a, 5b, respectively. The closed state is formed by being rotated clockwise. At this time, the click pin 9 of the first engaging means 10 and the engaging hole 12 of the second engaging means engage with each other, and the rotation of the barrier ring 4 is interlocked with the rotational movement of the zooming cam 11. This is as described above.

When the zooming cam 11 is rotated clockwise from the state shown in FIG. 3 (a), the click pin 9 is moved as described above.
Since the engagement hole 12 and the engagement hole 12 are engaged with each other, the barrier ring 4 also interlocks and rotates clockwise, and the cam portions 4a and 4b and the opening / closing pin 2
The contact state with a and 3a is gradually released.

In the abutting state, the first engaging means 10 causes the barrier cylinder 1 to move.
It will be completely released until it comes into contact with one end 1e of the notch 1c and the movement of the barrier ring 4 interlocked with the zooming cam 11 cannot be performed.

The contact state between the cam portions 4a, 4b and the opening / closing pins 2a, 3a is released, which means that the lens barriers 2, 3 can rotate counterclockwise by the urging force of the springs 5a, 5b. That is, the lens barriers 2 and 3 perform the opening operation, and as a result, the open state shown in FIG. 3B is set.

In the state shown in FIG. 3B, the zooming cam 11 is further rotated in the clockwise direction from the state where the open state of the lens barriers 2 and 3 is set, and the tip portion 9a of the click pin 9 is moved. The state in which the zoom pin 11 is in contact with the inner peripheral surface of the zooming cam 11, that is, the state in which the click pin 9 is housed in the frame body 7 by the elastic force of the spring 8 and the engagement with the engagement hole 12 is released is shown. ing.

Even if the above engagement is released, the lens barriers 2 and 3 remain open without returning to the original state, while the zooming cam 11 sets the longest focal length (tele end) at which the barrier cylinder 1 projects more than the camera. By rotating up to, the movement control of a plurality of moving frames (not shown) in the optical axis L direction by the cam groove 11a or the like, that is, the well-known zooming operation can be freely performed.

At this time, the tip 9a of the click pin 9 comes into contact with the inner peripheral surface of the zooming cam 11, that is, slides on the inner peripheral surface.

In addition, the shortest focal length (wide end) is set so that the lens barriers 2 and 3 as shown in FIG. 3 (b) can be opened, or the further zooming cam 11 can be rotated clockwise. It will be done at the appropriate time.

When the zooming cam 11 is rotated counterclockwise from the state in which the above-described known zooming operation is performed,
The plurality of moving frames move in the direction of setting the wide end, and at the same time, the barrier cylinder 1 integrally incorporating the foremost moving frame of the moving frames also moves along the optical axis L.

That is, the first engaging means provided on the barrier ring 4.
The tip portion 9a of the click pin 9 of 10 slides on the inner peripheral surface of the zooming cam 11, and the second portion provided on the zooming cam 11
It gradually approaches the engagement hole 12 which is the engagement means, and finally engages.

When the tip end portion 9a of the click pin 9 and the engagement hole 12 are engaged with each other and the zooming cam 11 further rotates in the counterclockwise direction, the mechanical output due to the rotation is directly supplied to the barrier ring 4, and The barrier ring 4, which has not been rotating until then, is interlocked and rotates counterclockwise.

When the barrier ring 4 rotates counterclockwise, as described above, the cam portions 4a and 4b contact the opening / closing pins 2a and 3a of the lens barriers 2 and 3, thereby causing the lens barriers 2 and 3 to spring 5.
It will be rotated clockwise against the biasing force of a and 5b, so the lens barriers 2 and 3 will gradually close,
Finally, the closed state shown in FIG.

The above operation is a series of operations of the lens barrier device according to the present invention, and the relationship between the lens barriers 2 and 3 and the zooming cam 11 in this operation is schematically shown in FIG.

That is, when the zooming cam 11 is at the reference position, the lens barriers 2 and 3 are in the closed state, and when the zooming cam 11 moves (rotates) to reach the wide end setting position, the lens barriers 2 and 3 are indicated by the solid lines. At the same time as the start of the movement, or as shown by the broken line, the movement is started after an appropriate time and gradually released. Then, this opening operation is completed by the time the zooming cam 11 reaches the wide end setting position at the latest. Also, the lens barriers 2, 3
As described above, the engagement between the click pin 9 and the engagement hole 12 is released after the release of the, and therefore the interlocking relationship between the zooming cam 11 and the lens barriers 2 and 3 is released.

The zooming cam 11 moves between the wide end and the tele end to set a desired focal length, but at this time, the lens barriers 2 and 3 are kept open and the click pin is used. 9 is maintained in a state in which its tip portion 9a is in contact with the inner peripheral surface of the zooming cam 11 by the elastic force of the spring 8, that is, in a state of being housed in the frame body 7.

On the other hand, when the zooming cam 11 moves in the reference position direction, the click pin 9 and the engagement hole 12 are engaged again at an appropriate position where the zooming cam 11 has exceeded the wide end setting position toward the reference position side, so that the lens The barriers 2 and 3 start the closing operation gradually from the above-mentioned appropriate position, and of course, when they return to the reference position, they are in the completely closed state.

Advantageous Effects of Invention In the lens barrier device according to the present invention, the lens driving member and the barrier driving member are interlocked only in a predetermined region via the first and second engaging means capable of forming an engagement relationship utilizing elastic force, Therefore, the mechanical output output from the lens driving member is directly transmitted to the barrier driving member in this predetermined region, and as a result, a reliable and highly accurate opening / closing operation of the lens barrier can be realized in the region. have.

Further, since the engagement relationship between the first and second engagement means is formed by utilizing the elastic force, it is not necessary to specially form the space occupied by each means when the engagement is not performed, and therefore the lens The first and second engaging means can be configured in the driving member, and as a result, there is an effect that the outer diameter of the lens driving member can be reduced, that is, the shape of the lens barrel can be downsized. .

[Brief description of drawings]

FIG. 1 is a schematic exploded perspective view of an essential part showing an embodiment of a lens barrier device for a camera according to the present invention, and FIGS. 2 (a) and 2 (b).
Is a drawing number 10 in the assembled state of the embodiment shown in FIG.
3 is a partial cross-sectional view and a partial view of the periphery of the first engaging means shown in FIG. 3, and FIGS. 3A and 3B are schematic plan views of essential parts in the assembled state of the embodiment shown in FIG. The drawings respectively show schematic diagrams showing the operational relationship between the lens barriers 2 and 3 and the zooming cam 11 in the embodiment shown in FIG. 1 ... barrier cylinder, 2,3 ... lens barrier, 4 ... barrier ring, 5a, 5b ... spring, 6 ... barrier base, 7 ... frame body, 8 ... spring, 9 ... click pin, 10 ...... first engaging means, 11 ... zooming cam, 12 ... engaging hole.

Claims (1)

(57) [Claims] 1. A lens driving member having a cam groove for engaging with a cam pin provided on a plurality of moving frames holding a lens group, for moving the moving frame in the optical axis direction, a lens barrier and the lens barrier. Barrier driving members each having a cam portion that comes into contact with the provided opening / closing pin are respectively rotatable around appropriate positions, and are held so as to be positioned in front of the foremost moving frame and integrated with the foremost moving frame. And a frame holding member that is inscribed in the lens driving member, a frame body, an elastic member accommodated in the frame body, and the elastic member that keeps the tip of the frame member outside the frame body. A click pin urged so as to project toward the first engaging means formed on either the lens driving member or the barrier driving member, and both of the members. The first engaging means is formed on the side where it is not formed, and the lens driving member engages with the click pin of the first engaging means only until the lens driving member moves from a reference position before photographing to a predetermined position, A lens barrier device for a camera, comprising: a second engaging means that is an engaging hole for transmitting a mechanical output of the lens driving member during driving to the barrier driving member.