JPH0468325A - Lens barrier device for camera - Google Patents

Abstract

PURPOSE:To miniaturize a barrier device by controlling the opening/closing operation in front of a photographic lens with the straight movement of both a 1st and a 2nd barrier member. CONSTITUTION:The barrier part 13 of the 1st barrier member 12 is constituted while equipped with an operation part 14 and a coupling part 15 integrally and when the 1st barrier member 13 moves straight in front of the photographic lens with a driving force supplied to its operation part 14, the movement is transmitted to the 2nd barrier member through only a control member 16. Then the 2nd barrier member 17 is moved associatively to set the states wherein the opening in front of the photographic lens is covered and uncovered by the movement of the 1st and 2nd barrier members 12 and 17. Consequently, the lens barrier device for the camera which is small in the number of components and reduced in size is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a lens barrier device disposed in front of a camera lens to protect the camera lens.

2. Description of the Related Art Lens barrier devices for protecting photographic lenses of cameras have been put to practical use in various types of small, lightweight so-called compact cameras and simple cameras called 110 cameras.

FIGS. 4(a) and 4(b) are schematic configuration diagrams showing the basic structure of a typical lens barrier device that has been put into practical use in the above-mentioned compact camera.

[The lens barrier device of 1(a) includes a pair of barrier blades 1
．． 2. An interlocking member 3 whose one end 3a is connected to the barrier blade 1 and the other end 3b is connected to the barrier blade 2, and which moves the barrier blade 1.2 in conjunction with each other by rotating around an axis 3C; An operating knob 4 that is moved when opening and closing the rear blade 1.2, a protruding end portion 5a that abuts the protruding boss 3d provided on the interlocking member 3, and a connecting portion that is connected to the operating knob 4. 5b, and transmits the moving operation of the operating knob 4 to the barrier blade 1.2 via the interlocking member 3 due to the abutting relationship between the protruding boss 3d and the protruding end 5a, and the barrier blade 1. .2 and a barrier biasing spring 6 that controls the movement of the barrier.

The state shown by the solid line in FIG. 4(a) is that of the barrier blade 1.
2 shows a closed state in which the opening in front of the photographic lens is covered and the photographic lens is protected. In this state, if the operation knob 4 is now moved in the direction of arrow A, the operation of moving the operation knob 4 is connected. The transmission is transmitted to the transmission member 5 via the portion 5b, and the transmission member 5 moves in the direction of the arrow A, that is, the projecting end 5a moves in the direction in which it releases contact with the projecting boss 3d. become.

Therefore, the interlocking member 3 becomes free and rotates around the shaft 3C in the direction of arrow B according to the biasing force of the clear biasing spring 6. As a result, the noiliar blades 1.2 are moved in the direction of arrows A and C, respectively. It will force you to move in the direction.

That is, the barrier blades 1.2 described above each move linearly in a direction that does not cover the opening in front of the photographing lens, and as a result of such linear movement, the two-dot chain line in FIG. 4(a) An open state as shown in is formed, and a state is established in which photography can be performed.

Although not shown, it goes without saying that a locking means is provided which temporarily locks each member, such as the operating knob 4, against the biasing force of the barrier biasing spring 6 in the aforementioned closed state.

Furthermore, when the operation knob 4 is moved in the direction of the arrow opposite to the above case from the open state, the protruding end 5a of the transmission member 5 will move in the direction of coming into contact with and pressing the protruding boss 3d. , Therefore, the interlocking member 3 is the barrier biasing spring 6
It is clear that the barrier blades 1.2 are rotated around the axis 3C in the direction of arrow E against the urging force of light, and as a result, the barrier blades 1.2 each move in the direction of arrow DXF, which is opposite to the direction of light. This movement results in the formation of the closed state shown by the solid line in FIG. 4(a).

The lens barrier device shown in FIG. 4(b) includes barrier blades 7.8 that can be rotated around shafts 7a and 8a, and
a rotating ring 9 which has an interlocking portion 9a that abuts or connects with the protruding pins 7b, 8b provided thereon, and rotates the barrier blades 7.8 about the respective shafts 7a, 8a; The barrier biasing spring 10.11 always biases the barrier blade 7.8 in a predetermined direction. Regarding the member corresponding to the operating knob 4 shown in the device of FIG. 4(a), that is, the member for operating the rotary ring 9, the rotary ring 9 can be moved manually or by a drive member of the lens barrel, etc. It is well known that the operation is automatically controlled, so it is omitted.

Similar to FIG. 4(a), the state shown by the solid line in FIG. 4(b) shows the closed state where the opening in front of the photographic lens is covered. When the rotating ring 9 is rotated in the direction of arrow C, the rotation of the rotating ring 9 is caused by the interlocking portion 9 a M protruding pin 7 b
, 8b to the barrier vane 7.8, which therefore moves in the direction of the arrow H, ? about the axis 7a, 8a, respectively, against the biasing force of the barrier biasing spring 10.11. You will be forced to move in the direction.

In other words, the barrier blades 7.8 described above rotate around M7a and M7a, respectively, in a direction that does not cover the opening in front of the photographic lens, and as a result of this rotational movement, as shown in FIG. 4(b), An open state as shown by the two-dot chain line is formed, and photography is possible.

Although not shown, it goes without saying that a locking means is provided which temporarily locks each member such as the rotating ring 9 against the biasing force of the barrier biasing spring 10, 11 in the above-mentioned open state. Also, when the rotation ring 9 is rotated in the direction of arrow J, which is opposite to the case where the rotation ring 9 is in the open state, the barrier blades 7.8
It also moves in the M direction, in the direction of the arrow opposite to the previous case, and this movement creates the closed state shown by the solid line in FIG. 4(b) described above.

Problems to be Solved by the Invention As mentioned above, various lens barrier devices have been put into practical use that move the front of the photographic lens between a position that covers and a position that does not cover the front of the photographic lens by moving the barrier blade straight or rotating. Looking at the number of parts and the space required to construct it, it still has the following disadvantages.

That is, since the device shown in FIG. 4(a) moves the barrier blades in a straight line, the space required to configure the lens barrier device, such as the retraction space for the barrier blades, is as shown in FIG. 4(b). Is it possible to reduce the number of barrier blades compared to the shown device that rotates the barrier blades? However, it requires many components such as a pair of barrier blades, an interlocking member, an operating knob, and a transmission member, which increases the number of assembly steps and reduces manufacturing costs. ,
This was disadvantageous in terms of cost.

In addition, when the device shown in FIG. 4(b) is manually controlled, it requires a barrier blade, a rotation ring, two barrier biasing springs, and a manual operation member for the rotation ring as components. Looking only at the number of points, the number of points can be slightly reduced compared to the previously mentioned device, but since the rotating ring has a circular shape and the barrier blade rotates to open and close the aperture in front of the photographic lens, The space required to configure the lens barrier device, including the arrangement space for the rotation ring, the retraction space for the barrier blades, etc., is larger than the previous device, which means that the device shape becomes larger. had.

The present invention was made in consideration of the above-mentioned disadvantages, and an object of the present invention is to provide a lens barrier device for a camera that has a small number of parts and can be formed compactly.

Means for Solving the Problems A lens barrier device for a camera according to the present invention includes a barrier portion having a shape capable of covering a part of the opening in front of the photographing lens of the camera, an operation portion to which a driving force is supplied, and the barrier portion. a first barrier member comprising a connecting part connecting the and the operating part, and arranged in front of the photographing lens so that the barrier part can move straight between a position covering a part of the opening and a position not covering a part of the opening; a second barrier member having a shape capable of covering other parts of the opening in front of the photographing lens that cannot be covered by the barrier portion and disposed so as to be movable in front of the photographing lens; and the first barrier member. a control member that operates in conjunction with the movement of the lens and moves the second barrier member in a direction opposite to the movement direction of the first barrier member; A biasing means for biasing the first barrier member to be positioned forward, and a locking means for resisting the biasing force of the biasing means and retaining the first barrier member in a position where it does not cover the front of the photographic lens. configured.

Function: The lens barrier device for a camera according to the present invention is configured such that the first barrier member integrally includes a barrier section, an operating section, and a connecting section. When the photographic lens is moved straight ahead by the supplied driving force, the movement is transmitted to the second barrier member only through the control member, causing the second barrier member to move in conjunction with the first, By moving the second barrier member, a state in which the opening in front of the photographing lens is covered and a state in which it is not covered is set.

That is, the camera lens barrier device according to the present invention has the following features:
It is constructed with a small number of parts such as the first and second barrier members, and its opening/closing operation is controlled by linear movement, which results in cost reduction and miniaturization.

EXAMPLE An example of a lens barrier for a camera according to the present invention will be described below.

1 and 2 are partial configuration diagrams showing one embodiment of a camera lens barrier according to the present invention, FIG. 1 is a schematic front view of the main part, and FIG. 2 is a schematic side view of the main part, respectively. ing.

The first barrier member 12 includes a barrier portion 13 having a shape capable of covering a part of the front of the photographing lens L of the camera;
It consists of an operating section 14 to which driving force is supplied, and a connecting section 15 that connects the barrier section 13 and the operating section 14. In front of the photographing lens, the barrier section 13 closes a part of the opening in front of the lens. It is placed and attached to the camera body so that it can be moved straight between the covered and uncovered positions.

The first barrier member 12 also includes a control member 16 which will be described later.
In order to make the operation slow, it is provided with a connection boss 12a connected to the first connection end 16b of the control member 16, and further provided with a click groove 12b forming a part of a locking means 19, which will be described later, on the back surface of the connection boss 12a. .

The second barrier member 17 has a shape that can cover the other part of the opening in front of the photographing lens that cannot be covered by the barrier part 13, and also comes into contact with a second connecting end 16c of the control member 16, which will be described later. It is provided with a connecting boss 17a, and, like the first barrier member 12, is arranged and attached to the camera body so as to be movable straight ahead of the photographic lens.

The control member 16 is mounted on the camera body so as to be rotatable around a rotation shaft 16a, and has groove-shaped first grooves at both ends thereof, which are connected to the connection bosses 12a and 17a.
, a second connecting end 16b116c.

Therefore, the connecting ends 16b and 16C are connected to the control member 1.
6 are rotated about the rotation shaft 16a, thereby being moved in opposite directions.

The spring 18, which is a biasing means, has one end 18a connected to the locking part of the camera body and the other end 18b connected to the second barrier member 17.
is engaged with the locking protrusion 17b. Therefore, the second barrier member 17 is always urged by the spring 18 so as to be located in front of the photographic lens.

The locking means 19, the configuration of which is shown in FIG. and a plate spring 21 provided on the camera body. For this reason, the first
The barrier member 12 has the click groove 12b and the ball 2.
0, it is locked in the fitted state against the biasing force of the spring 18, which is the biasing means.

Hereinafter, the operation of one embodiment of the camera lens barrier device according to the present invention having the above-mentioned configuration will be described.

The state shown by solid lines in FIGS. 1 and 2 shows the so-called closed state in which the barrier portion 13 of the first barrier member 12 and the second barrier member 17 cover the opening in front of the photographing lens. , in such a state, the first barrier member 12
Suppose that a driving force in the direction of arrow N that overcomes the locking strength of the fitted state of the leaf spring 21 between the click groove 12b of the locking means 19 and the ball 20 is supplied to the operating portion 14 by, for example, a manual operation. The entire first barrier member 12 including the barrier portion 13 and the like moves in the same direction.

The movement operation of the first barrier member 12 is performed by connecting the connecting boss 12a.
, is transmitted to the control member 16 via the first connecting end 16b, so that the control member 16 rotates in the direction of arrow O about the rotation axis 16a, that is, the second connecting end 16c or the connection boss 17a of the second barrier member 17
In the drawing, it means pressing downward.

Therefore, the second barrier member 17 is moved in the direction of arrow P against the biasing force of the spring 18, that is, the barrier part 13 of the first barrier member 12 and the second
The barrier members 17 move linearly in a direction in which they do not cover the opening in front of the photographic lens, and as a result of such linear movement, the barrier members 17 open as shown by the two-dot chain line in FIG. The state will be established and the camera will be in a state where it can be photographed.

Note that, as is clear from the drawings, the amount of movement of the first barrier member 12 required during such an opening operation is such that the shape of the barrier portion 13 in this embodiment is smaller than the shape of the second barrier member 17. On the other hand, the rotation center 16a of the control member 16 is formed on the first connection end 16b side, and therefore the amount of movement of the first barrier member 12 described above is greater than that of the second barrier member 17. will also decrease. In other words, the operation of opening the aperture in front of the photographic lens is realized with a smaller amount of operation of the operation section 14 than when the barrier section 13 and the second barrier member 17 have the same shape and have the same amount of movement. is made of.

On the other hand, in the open state, the locking means 1 is attached to the operating section 14.
If a driving force in the direction of the arrow Q opposite to the previous case is supplied by manual operation, for example, to overcome the locking strength of the fitted state of the click groove 12b of No. 9 and the ball 20 by the plate spring 21, the first The barrier member 12 moves in the direction of arrow Q, and the control member 16 rotates about its rotation axis 16a in the direction of arrow R, which is opposite to the previous rotation direction.
That is, the second connecting end 16c presses the connecting boss 17a upward in the drawing.

Therefore, the second barrier member 17 moves in the direction of the arrow S according to the biasing force of the spring 18. That is, the barrier portion 13 of the first barrier member 12 and the second barrier member 17 move in front of the photographing lens. As a result of this linear movement, the closed state shown by the solid line in FIG. 1 is formed, which is a state in which the photographing lens can be protected. will be obtained.

The basic operation of the embodiment shown in FIGS. 1 and 2 has been described above. When the stop means 19 locks in the closed state, the elastic force acts, that is, in the closed state described above, the barrier part 13 is urged toward the second barrier member 17 by the elastic force. By doing so, it is possible to prevent the barrier part 13 and the second barrier member 17 from separating inadvertently in the closed state, and to form a stable closed state.

In order to give the above-mentioned elastic force to the connecting part 15, various methods can be used, such as forming the connecting part 15 thinly as shown in FIGS. 3(a) and 3(b), or forming a hollow part 15a. Possible methods are:

Further, in the embodiment described above, a spring 18 that always biases the first and second barrier members 12.17 in the closing direction, and a spring 18 that resists the biasing force of the spring 18, 12.17 is provided with a locking means 19 for locking it in the open state, but it is also possible to adopt a well-known toggle mechanism in place of the spring 18 and locking means 19. Although not shown, another development of the present invention It can be thought of as In the case of employing such a toggle mechanism, it is possible to prevent the above-mentioned first and second barrier members 12, 17 from being opened inadvertently, even without particularly applying elastic force to the above-mentioned connecting portion 15.

Effects of the Invention The lens barrier device for a camera according to the present invention includes a first barrier member that integrally includes a barrier section, an operation section, and a connecting section, and further includes a control member for controlling the linear movement of the first barrier member. The transmission is transmitted to the second barrier member via the lens barrier member to control the linear movement of the first and second barrier members in conjunction with each other. Since the opening and closing states are set and controlled, the number of required parts can be reduced, which simplifies the configuration and assembly work, and has the practical effect of reducing costs.

Further, the opening/closing operation of the front of the photographing lens by the first and second barrier members is controlled by the linear movement of both of the barrier members, which also has the effect of reducing the size of the device.

Furthermore, by imparting elasticity to the connecting portion of the first barrier member, it can be expected that a stable closed state can be formed without using a special biasing structure.

Furthermore, the shapes of the barrier part of the first barrier member and the second barrier member can be set appropriately, which means that there is a large degree of freedom in design. In particular, the shape of the barrier part can be configured to be smaller than that of the second barrier member. By setting the center of rotation of the interlocking member at an appropriate position, it can be expected that the amount of movement of the first barrier member, that is, the amount of operation required for opening and closing the front of the photographic lens can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a schematic front view of the main parts showing the partial configuration of an embodiment of the camera lens bar I) 7 device according to the present invention, Fig. 2 is a schematic side view of the main parts, and Figs. 3 (a) and (b). is a front view showing another example of the first barrier member shown in figure number 12;
) and (b) are schematic configuration diagrams showing the basic structure of a well-known lens barrier device that has been put into practical use. 12... First barrier member, 13... Barrier part, 1
4... Operating section, 15... Connecting section, 16... Control member, 17... Second barrier member, 18... Spring, 1
9...Locking means, 20...Ball, 21...Flat spring agent's name Patent attorney Shigetaka Awano Haka12 Figure 1 Mu! Girl f2- Wire f wire WP material 13--Barrier part 2θ-Ball

Claims (3)

[Claims] (1) Consisting of a barrier part having a shape capable of covering a part of the opening in front of the photographing lens of the camera, an operating part to which driving force is supplied, and a connecting part connecting the barrier part and the operating part, a first barrier member disposed in front of the lens so that the barrier part can move straight between a position where the barrier part covers a part of the opening and a position where it does not cover the opening; a second barrier member having a shape capable of covering a portion of the photographing lens and arranged so as to be able to move straight ahead of the photographic lens; a control member that causes the barrier member to move straight in a direction opposite to the moving direction of the first barrier member; and an urging member that urges the first or second barrier member to be located in front of the photographing lens. and locking means for locking the first barrier member in a position where it does not cover the opening in front of the photographic lens against the urging force of the urging means. (2) The lens barrier device for a camera according to claim 1, wherein the connecting portion is configured to have an elastic force in the direction of rectilinear movement of the first barrier member. (3) The lens barrier device for a camera according to claim (1) or (2), wherein the barrier portion is formed smaller than the second barrier member.