JPH0611756A - Shutter with lens driving mechanism - Google Patents

Abstract

PURPOSE:To make a lens bifocal, to make a shutter simple constitution and small in size and to reduce the manufacturing cost thereof. CONSTITUTION:An opening and closing lever 2 is interlocked with the output shaft 1a of a motor 1 which can be rotated forward and backward. Besides, a shutter blade 5 bidirectionally opening and closing an aperture 4 is interlocked with the lever 2. An interlocking lever 8 is interlocked by the lever 2 and an actuation lever 10 is interlocked with the lever 8 by a control spring 13. A lens driving member 11 moving a lens forward and backward is interlocked by the lever 10. Then, stopper pins 12a and 12b stopping the driving member 11 at a long-distance photographing position and a short-distance photographing position are provided on both sides of a projection part 11a. When the motor 1 is driven, a shutter opening and closing action is executed by the blade 5 after the driving member 11 abuts on the stoppers 12a and 12b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter with a lens driving mechanism used in still cameras and the like.

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
A shutter with a lens drive mechanism provided in a still camera or the like uses a step motor, a DC motor, or the like as a drive source. In such a shutter with a lens driving mechanism, regarding a driving source, a motor for driving the lens and a motor for opening / closing the shutter blade are separately provided, and a single motor is used for the lens driving and the opening / closing operation of the shutter blade. There is something to do. Among them, the one in which the lens driving and the opening and closing of the shutter blades are performed by separate motors is often used especially in a camera equipped with a zoom lens, but in a compact camera such as a single-focus camera that requires low cost, a plurality of However, the use of the motor has a drawback that the cost is high.

Further, in a shutter with a lens driving mechanism for driving a lens and opening and closing the shutter with a single motor, for example, by driving the motor in one direction, only the lens is moved alone, and the lens is moved to a desired position. A technique is known in which, after the movement, the motor is driven in the opposite direction to open and close the shutter blades. However, such a structure has drawbacks that the operating mechanism becomes complicated, the occupied space increases, the number of parts and the number of assembling steps increase, and the manufacturing cost increases. As described above, the conventional shutter with a lens driving mechanism has a surface unsuitable for mounting on a compact camera or the like which is required to be small and low in price.

In view of the above problems, it is an object of the present invention to provide a shutter having a lens driving mechanism, which has a relatively simple structure and is small in size and low in manufacturing cost.

[0005]

A shutter with a lens driving mechanism according to the present invention comprises a motor capable of rotating in the forward and reverse directions, and an opening / closing member which is held at a reference position and operates in two directions from the reference position in conjunction with motor driving. , A lens driving member that advances and retracts the lens to and from both near and far photographing positions in conjunction with the operation of the opening and closing member in two directions, and an opening that is closed at the reference position of the opening and closing member and that operates in conjunction with the opening and closing member. Shutter blades for opening and closing the respective openings when actuated in the direction. Further, the opening / closing member and the lens driving member are provided with magnetic members facing each other,
It is characterized in that the opening / closing member and the lens driving member are interlocked with each other by the attraction force between the two magnetic members.

[0006]

When the lens is set at the long-distance photographing position for photographing, for example, when the motor is driven in the forward direction, the opening / closing member interlocks to move the lens in the long-distance direction and move it to a predetermined position. The lens is held in that position, and when the motor is further moved in the same direction, the shutter blades work together in one direction to open the aperture, and when the lens is set at a short distance for shooting. If the motor is driven in the reverse direction, the movement of the lens to the close-up photographing position and the opening operation by interlocking with the shutter blade in the other direction are sequentially performed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. 1 is a diagram showing a schematic configuration of a shutter with a lens driving mechanism in an initial closed state, FIG. 2 is a diagram similar to FIG. 1 in a shutter opened state, and FIG. 3 is a diagram showing an operation sequence. In FIG. 1, the output shaft 1a attached to the eccentric position of the motor 1 capable of forward and reverse rotation is the motor 1
The current is cut off at the intermediate point shown in the figure.
The fork portion 2a of the first arm of the substantially T-shaped opening / closing lever 2 is fitted to the output shaft 1a for pin-fork connection, and the opening / closing lever 2 is planted on a shutter base plate (not shown). It is rotatably supported by a support shaft 3.
A pin 2b is provided on each of the second arm portion and the third arm portion of the opening / closing lever 2.
And a fork portion 2c are provided, and the pin 2b of the inner second arm portion is pivotally attached to the shutter blade 5 capable of opening and closing the opening 4. The shutter blade 5 is rotatably supported by the support shaft 6 at a position close to the pin 2b, and the opening 4 can be opened at both side edges of the region covering the opening 4 when the motor 1 rotates in the normal direction and the reverse direction. Thus, arc-shaped opening edge portions 5a and 5b are formed. Moreover, both opening edges 5a of the shutter blades 5,
The width between 5b is set so that the motor 1 does not deviate from the position that covers the opening 4 unless the motor 1 rotates in the left-right direction from the intermediate point by a certain angle.
A certain length exceeding the diameter of the opening 4 is secured.

Further, a pin 8a and a push pin 8b are fixed to both ends of an interlocking lever 8 which is rotatably held by a support shaft 7, and one pin 8a is formed at the tip of the third arm portion of the opening / closing lever 2. The fork portion 2c is connected with the pin-fork, and the interlocking lever 8 interlocks with the opening / closing lever 2. An operating lever 10 is also rotatably supported on the support shaft 7 so as to partially overlap with the interlocking lever 8, and pins 10a and 10b are provided at the central portion and the end portion of the operating lever 10, respectively. The pin 10b at the end is pin-fork connected to a fork portion 11b located at the tip of the protrusion 11a of the lens driving member 11 that holds the photographing lens. Then, the protrusions 11a are arranged on both sides of the protrusion 11a with a certain space.
Stopper pins 12a and 12b for locking are fixed. The lens driving member 11 is rotated left and right to extend and retract the lens from the standard position to the long-distance photographing position and the short-distance photographing position.
It can be stopped by a and 12b (see FIG. 2). In the present embodiment, it is assumed that the state where the lens driving member 11 is in contact with the right stopper pin 12a is the short-distance photographing position, and the state where the lens driving member 11 is in contact with the left stopper pin 12b is the long-distance photographing position. Note that, as shown in FIG. 1, the initial state in which the motor 1 is located at the intermediate point and the lens is at the standard position between the two distance photographing positions is the reference position of each member.

A control spring 13 is hung between the interlocking lever 8 and the operating lever 10.
Is wound around the support shaft 7 at the central portion, and the push pin 8b of the interlocking lever 8 and the pin 1 of the actuating lever 10 are wound on both arm portions 13a and 13b.
It is sandwiched with 0a. Therefore, when driving the motor 1,
The interlocking lever 8 and the actuating lever 10 are integrally rotated by the control spring 13 until the protrusion 11a of the lens driving member 11 contacts the stopper pin 12a or 12b, and after the contact, the biasing force of the control spring 13 is applied. On the contrary, only the interlocking lever 8 can be rotated. Further, the shutter blade 5 is disengaged from the opening 4 to operate the shutter opening by the rotation of the opening / closing lever 2 after the contact.
Further, a pair of springs 14 and 15 are hung on both sides of the second arm portion of the opening / closing lever 2 and urged in both directions, so that when the motor 1 is stopped, each member such as the lens driving member 11 is moved.
The opening / closing lever 2 is made to stand still at the reference position so as to be held at the reference position shown in FIG.

This embodiment is constructed as described above,
Next, the operation will be described based on the operation sequence of FIG.
In the initial state in which the power supply to the motor 1 is cut off, the output shaft 1a is at the intermediate point, and the opening / closing lever 2 and the lens driving member 11 are at the reference position as shown in FIG. At this position, the opening 4 is covered by the shutter blades 5 and the shutter is closed. Then, from this state, for example, when the photographing lens is set to the short-distance photographing position and photographing is performed, when the motor 1 is rotated counterclockwise (reverse rotation), it opens and closes against the biasing force of the two springs 14 and 15. The lever 2 is interlocked and rotated right about the support shaft 3. The shutter blade 5 interlocks with the clockwise rotation of the opening / closing lever 2.
Is rotated counterclockwise about the spindle 6, but the opening 4 is still kept closed. At the same time, the interlocking lever 8 is rotated counterclockwise about the support shaft 7 in conjunction with the clockwise rotation of the opening / closing lever 22, so that the control spring 13 is pushed by the pin 8b to rotate integrally, and the control spring 13 is rotated. Since the arm portion 13b pushes the pin 10a of the operating lever 10, the operating lever 10 also rotates integrally with the interlocking lever 8. Since the lens driving member 11 is rotated to the right in conjunction with the counterclockwise rotation of the operation lever 10, the lens is retracted, and the lens is brought to the short-distance photographing position with the protrusion 11a in contact with the stopper pin 12a. , Held in that position. Then, focusing adjustment is performed by means not shown.

After the lens position setting is completed in this way, when the motor 1 is further turned to the left and the opening / closing lever 2 is turned to the right, the shutter blade 5 is further turned to the left and the opening 4 is opened.
Opening operation is started, and the opening 4 reaches a fully opened state as shown in FIG. At this time, the interlocking lever 8 is also rotated counterclockwise in conjunction with the opening / closing lever 2, but the operating lever 10 is not rotated because the projection 11a of the lens driving member 11 is in contact with the stopper pin 12b. Therefore, one arm portion 13b of the control spring 13 is locked to the pin 10a, and the other arm portion 13a is pushed by the push pin 8b to rotate while increasing the urging force, whereby the interlocking lever 8 moves. Left-handed rotation will be allowed.

In this way, when the shutter is held fully open and the required exposure amount is obtained, the power supply to the motor 1 is cut off. Then, the interlocking lever 8 is rotated rightward in the position direction of the actuating lever 10 by the urging force of the control spring 13, and at the same time, the opening / closing lever 2 is interlocked, while the opening / closing lever 2 is connected to the two springs 14 of the second arm portion. It will be turned left by the urging force of 15 ,. Therefore, the shutter blade 5 is rotated in the closing direction, and then the lens driving member 11 is also returned to the reference position in conjunction with the clockwise rotation of the operation lever 10.
Each member is returned to the position shown in FIG. Then, it is stopped at the reference position shown in FIG. 1 by the urging force of the two springs 14 and 15 applied to the second arm portion of the opening / closing lever 2. In this way, one shooting is completed.

Next, when the photographing lens is set at the long-distance photographing position and photographing is performed, when the motor 1 is rotated clockwise (normal rotation), the opening / closing lever 2 is interlocked with the spindle 3 to rotate left. The shutter blades 5 and the interlocking lever 8 are operated in the same manner as described above.
Also, the lens is set to the long-distance photographing position at the position where the lens driving member 11 is brought into contact with the stopper pin 12b by interlocking the operating lever 10. Further, when the motor 1 is rotated clockwise, the shutter blade 5 is opened with respect to the opening 4.

The shutter according to the present embodiment is a shutter that also serves as a diaphragm, and in order to make the diaphragm small, it is sufficient to control so that the power supply to the motor 1 is cut off during the opening operation of the shutter blade 5. . However, it goes without saying that the mechanism according to the present embodiment can be adopted even in a shutter provided with a separate diaphragm. Further, in the above description, the shutter blade has a single blade structure for convenience of description, but it goes without saying that the shutter blade may have a plurality of blades. In this case, the pin 2b of the second arm of the opening / closing lever 2 may be pin-slot connected to each shutter blade between the support shafts of the respective shutter blades to open / close the shutter blades in two directions.

As described above, in this embodiment, by selecting the driving direction of the single motor 1, the photographing lens can be selectively set to the two focal points of the long distance photographing position and the short distance photographing position. Therefore, the shutter blade 5 can be opened and closed in any direction. Further, the lens drive and the shutter opening / closing operation can be sequentially performed by using the single motor 1 and only by the continuous drive in the same direction, and the structure and the operation can be extremely simplified. Therefore, a bifocal camera can be provided at a relatively small size and at a low price, and a shutter with a lens drive mechanism most suitable for a compact camera can be obtained.

Next, a second embodiment of the present invention will be described with reference to FIGS.
The same members or parts as those in the above-described first embodiment are designated by the same reference numerals, and the description thereof will be omitted. Figure 4
FIG. 5 is a schematic configuration diagram of a shutter with a lens driving mechanism in an initial state, and FIG. 5 is a diagram of a shutter open state when the taking lens is set at a long distance photographing position. In this embodiment, the interlocking lever 8 and the operating lever 10 are not provided. A first magnetic member 17 made of, for example, a permanent magnet is provided at the tip of the third arm of the opening / closing lever 2. or,
A second magnetic member 18 made of, for example, a permanent magnet is provided at the tip of the protrusion 11 a of the lens driving member 11. Both magnetic members 17 and 18 have one N so that they attract each other.
The pole and the other S pole are located so as to face each other, and the attraction force acts between the magnetic members 17 and 18 within the rotation range of the opening / closing lever 2 and the lens driving member 11 regardless of the rotation angle of both. They are arranged close to each other. Moreover, the motor 1 is at the midpoint and the lens driving member 11 is at the reference position.
In this state, the magnetic members 17 and 18 are in the positions closest to each other, and the suction force is maximized.

Since this embodiment is constructed as described above, when the motor 1 is driven, the motor 1 is driven against the attraction force of the magnetic members 17 and 18, and the lens driving member 1 is driven.
The shutter blade 5 opens the opening 4 by driving the motor after the protrusion 11a of No. 1 abuts on the stopper pin 12b and the lens is set to the long-distance photographing position (see FIG. 5). Further, when the shutter is closed from the open state shown in FIG. 5 at the end of the exposure and the lens is returned to the standard position, the opening / closing lever 2 and the lens driving member 11 rotate counterclockwise with each other due to the attractive force between the magnetic members 17 and 18. It is turned right and returned to the reference position shown in FIG. 4 where the suction force is maximized. Therefore, in this embodiment, the spring as in the first embodiment is unnecessary.

As described above, in this embodiment, the spring for returning each member to the reference position, the interlocking lever 8 and the operating lever 10 are used.
Is unnecessary and the number of parts can be further reduced, so that the structure can be further simplified, the exclusive space can be reduced, and the size can be reduced and the manufacturing cost can be further reduced. Further, this embodiment has an advantage that a design with a high degree of freedom is possible because no mechanical connection is required.

[0019]

As described above, the shutter with a lens driving mechanism according to the present invention is composed of a shutter blade that opens in parallel with an opening / closing member that operates in two directions and opens when opening in two directions. Since the lens drive member that moves the lens forward and backward in both directions in association with the operation in the direction is provided, the lens can be set at the two focal points in the perspective with a relatively simple structure, and the size is small and the number of parts is small. Manufacturing cost can be reduced. Further, since the opening / closing member and the lens driving member are respectively provided with magnetic members, the number of parts can be further reduced, the exclusive space can be reduced, and the size and manufacturing cost can be reduced. Also, the degree of freedom in design is great.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a shutter with a lens driving mechanism in an initial state according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a shutter open state in which a lens is in a close-up photographing position in a shutter with a lens driving mechanism according to a first embodiment of the present invention.

FIG. 3 is an operation sequence of the first embodiment.

FIG. 4 is a view similar to FIG. 1, showing a shutter with a lens driving mechanism according to a second embodiment of the present invention.

FIG. 5 is a diagram showing a shutter with a lens driving mechanism according to a second embodiment of the present invention in a state where a lens is at a long distance photographing position and a shutter is opened.

[Explanation of symbols]

1 ... motor, 2 ... opening / closing lever, 4 ... opening, 5 ...
Shutter blade, 8 ... interlocking lever, 10 ... operating lever, 11 ... lens driving member, 17 ... first magnetic member,
18 ... The second magnetic member.

Claims (2)

[Claims] 1. A forward / reverse rotatable motor, an opening / closing member which is held at a reference position and operates in two directions from the reference position in conjunction with driving of the motor, and an interlocking operation of the opening / closing member in two directions. And a lens drive member for moving the lens forward and backward in both directions, and a shutter blade for closing the opening at the reference position of the opening and closing member and for opening and closing the opening when operating in two directions in conjunction with the opening and closing member. And a shutter with a lens drive mechanism. 2. The opening / closing member and the lens driving member are provided with a magnetic member facing each other, and are linked with each other by an attraction force between the two magnetic members. A shutter with the lens driving mechanism described.