JPH055547Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a filter switching device for a camera, and more particularly to a filter switching device for a camera having a front cover that covers a photographic lens.

Generally, camera filters are used by attaching them to a screw provided on the inner periphery of the front end of the photographic lens, but in compact portable cameras that have a front cover that covers the lens, in order to make the camera thinner, There is no screw for attaching a filter to the front of the photographic lens, so a normal screw-in filter cannot be used. However, even in this type of camera, it is often better to use a filter, so an attempt to incorporate a filter into the camera was disclosed, for example, in the Public Utility Model Publication No. 3931/1983, and is already known. be.

In the camera with a filter disclosed in this public utility model gazette, an openable and closable front cover is provided on the front of the camera to cover the front of the collapsible photographic lens, and a filter is pivotally supported inside the front cover. The filter is constructed such that the filter can be raised up as necessary to cover the front surface of the photographing lens. Therefore, in this known camera, the camera with this front lid is very useful, since it is not necessary to forget to carry a filter.

However, in this known filter switching device, when the filter is not in use, the surface of the filter is placed lying down in front of the photographic lens, so that the light reflected from the surface enters the photographic lens, causing flare. This may cause damage to the photograph. Furthermore, since the operation of opening the front cover and the operation of raising the filter are performed by completely different operations, it takes time to prepare for photographing when the filter is used, and there is a risk of missing the shutter opportunity.

The present invention solves the above-mentioned drawbacks of the conventionally known devices, and allows the filter to be attached and removed as necessary by opening and closing the front cover of the camera, and to prevent the filter from interfering with photography when not in use. The object of the present invention is to provide a filter switching device.

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.

1 and 2 are perspective views of the first embodiment of the present invention, with FIG. 1 showing the front lid open and FIG. 2 showing the filter positioned in front of the photographic lens.

In FIG. 1, a front cover 2 provided on the front surface of a camera body 1 is slidably supported on the camera body 1 via a protrusion 2a that engages with a guide groove 1a of the camera body 1. As shown in FIG. In addition, the end surface of the protrusion 2a of the front cover 2 has three notch grooves 2b ₁ , 2b ₂ ,
2b ₃ is provided, one of which has a notched groove 2b ₂
The tip 3a of the pawl lever 3 is engaged with. This claw lever 3 is rotatably supported by a shaft 4 implanted in the camera body 1, and the shaft 4 is always supported by a coil torsion spring 6 whose one end is fixed by a pin 5.
It is urged to rotate clockwise in FIG. 1 about the center.

In FIGS. 1 and 2, the front cover 2 slides left and right guided by the guide groove 1a of the camera body 1.
Inside the front lid 2, a filter holding frame 10 having a filter 8 at one end is rotatably supported by a support shaft 11 implanted in the inner surface of the front lid 2.
The filter holding plate 10 is always urged by a tension spring 12 to rotate clockwise in FIG. In the position where it is retracted into the front lid as shown in FIG. In addition, the filter holding frame 10 has two
Two continuous cam grooves 14a and 14b are formed, one cam groove 14a is formed long in the left and right directions in FIG. It is formed in an arc shape inclined at a predetermined angle with respect to 14a. A fixing pin 15 implanted in the camera body 1 is slidably provided in the two cam grooves 14a and 14b.

Since the first embodiment shown in FIG. 1 is constructed as described above, when carrying the camera, the front cover 2 is usually placed in the first position covering the photographic lens 9, and the tip of the claw lever 3 is placed in the first position. 3a is fixed by engaging with the notch groove _2b1 of the front cover 2. FIG. 3a is an explanatory diagram showing the state of the filter holding frame 10 when the front lid 2 is in the first position. When the front cover 2 is closed, it is fixed in contact with the limiting pin 13 by the biasing force of the tension spring 12, and the fixing pin 15 implanted in the camera body 1 is fixed in the cam groove 14a.
It is located at the right end of the .

When taking pictures, first of all, use the claw lever 3 of the fixing means.
One end 3b is rotated counterclockwise around the shaft 4 against the biasing force of the coiled torsion spring 6 to disengage the tip 3a from the notch groove _2b1 . next,
Push the finger rest 2c provided on the surface of the front lid 2 to the right in FIG. 1, and open the front lid 2 by sliding it to the right in FIG. 1 along the guide groove 1a.

When the front cover 2 is slid from the first position to the second position during photographing, the fixing pin 15 slides in the cam groove 14a as shown in FIG.
4a, but since the direction of the cam groove 14a and the sliding direction match, the filter holding frame 10 remains in contact with the restriction pin 13. In the case of normal photography, in this second position, the photographing lens 9 is exposed as shown in _FIG . By fixing it, it becomes possible to take pictures.

When taking pictures using a filter, disengage the pawl lever 3 from the notch groove _2b2 , and remove the front cover 2.
If you further slide it to the right in Figure 1, Figure 3 c
As shown in , the support shaft 11 that rotatably supports the filter holding frame 10 moves in the direction of arrow B. However, since the fixing pin 15 installed in the camera body 1 does not move, the cam groove 14b is attached to the fixing pin 15.
Pressed by. Therefore, filter holding frame 1
0 moves in the direction of arrow B, resisting the biasing force of the tension spring 12, and moves around the support shaft 11 as shown in FIG. 3c.
As shown in FIG. 3d, the fixing pin 15 comes into contact with the end of the cam groove 14b and stops the rotation. At the same time, the front cover 2 comes into contact with the right end of the guide groove 1a and stops at the third position, _and as shown in FIG. It is fixed in that position. Also, the filter 8 is the photographic lens 9.
slide it to the front of the screen and lock it in place.

Next, when removing the filter 8 from the front surface of the photographic lens 9, in the opposite manner to the above-described operation, push the one end 3b of the claw lever 3 of the fixing means against the biasing force of the coil torsion spring 6, and Notch groove 2b ₃
After disengaging from the front cover 2, the front cover 2 is moved to the left in FIG. 2 from the third position to the second position. Then, the distance between the support shaft 11 that supports the filter holding frame 10 and the fixing pin 15 is shortened, so that the film holding frame 10 moves the support shaft 11 clockwise along the cam surface 14b due to the urging force of the tension spring 12. The filter 8 rotates around the center and returns to the state where the filter 8 is housed in the front lid 2 as shown in FIG. Further, when the front cover 2 is moved leftward in FIG. 1 from the second position to the first position, the fixing pin 15 slides within the cam groove 14a,
As shown in FIG. 3a, the front cover 2 moves to the right end of the cam groove 14a and stops at the position where it covers the photographing lens 9, that is, the first position. Therefore, by engaging the tip 3a of the pawl lever 3 with the notch groove _2b1 , the front cover 2 is fixed at its first position. Therefore, there is no fear that the front cover 2 will open easily while the camera is being carried and the photographing lens will be damaged.

4 to 6 are plan views of the second embodiment of the present invention, in which FIG. 4 shows a state in which the front cover is closed, FIG. 5 shows a state in which the front cover is open, and FIG. The state shown is that it is located in front of the. Note that members having the same functions as those in the embodiment shown in FIG. 1 are given the same reference numerals as in FIG. 1, and explanations of the structure of the members will be omitted.

In FIG. 4, a filter 8 is held inside the front lid 2, which is slidably supported in the camera body 1 by a guide groove (not shown) similar to the guide groove 1a shown in FIG. A filter holding frame 20 is housed. This filter holding frame 20 has
Two long guide grooves 20a are provided at both ends of the filter holding frame in a direction matching the sliding direction of the front cover 2. 20 is slidably supported. Also, the filter holding frame 20
is always biased so as to be able to be displaced to the left in FIG. Therefore, movement to the left is arrested. This latch lever 23 is rotatably supported by a support shaft 24 installed on the back surface of the front lid 2, and is configured to be able to rotate clockwise around the support shaft 24 at all times by a coil torsion spring 25. Rotation is restricted by a restriction pan 26 installed on the back surface of the front lid 2. Further, a filter holding frame 20 is provided on the side surface of this latch lever 23.
A claw portion 23a that engages with the protrusion 20b is provided protrudingly,
An inclined surface 23b that can come into contact with a fixing protrusion 27 provided on the camera body 1 is formed at the tip.

Prior to photographing, similarly to the embodiment shown in FIG. 1, the claw lever 3 is disengaged from the notch groove _2b1 of the front cover 2, and the front cover 2 is moved from the first position shown in FIG. 2
When it slides to the right to the position, the locking lever 23 also slides to the right. Claw portion 2 of this latch lever 23
3a is engaged with the protrusion 20b of the filter holding frame 20, so the filter holding frame 20 moves to the right together with the front cover 2 against the biasing force of the tension spring 22, and is retracted from the front of the photographic lens 9. do. This second
When the claw lever 6 is engaged with and fixed in the notch groove _2b2 of the front cover 2 in the same manner as shown in FIG. 1, the front cover 2 is opened and ready for photographing as shown in FIG.

In the case of using a filter, when the front cover 2 is further displaced slightly to the right from the second position in FIG. Then, it rotates counterclockwise about the support shaft 24 against the biasing force of the coil torsion spring 25. Therefore, the claw portion 23a of the latch lever 23 and the protrusion 20b of the filter holding frame 20
The filter holding frame 20 is disengaged from the sixth filter holding frame 20.
As shown in the figure, the filter 8 is displaced to the left by the biasing force of the tension spring 22 and stops at a position where the filter 8 covers the front surface of the photographic lens 9. Further, the front cover 2 is fixed in the third position shown in FIG. 6 by engagement between the claw lever 3 of the fixing means and the notch groove _2b3 . In order to return to the normal shooting state (filter retracted state) as shown in FIG. 5 from the state shown in FIG. 6 in which the filter 8 is attached to the photographic lens 9, first move the front cover 2 from the third position to the left. Move the filter 8 back to the first position as shown in FIG.
After the claw portion 23a of the latch lever 23 and the protrusion 20b of the filter holding frame 20 are engaged, the front cover 2 is moved to the right to the second position shown in FIG. Bye.

In the second embodiment described above, since the tension spring 2 is charged by the operation of opening the front cover 2 for normal photography, the filter holding frame 2 is
0, and attach the filter 8 to the photographing lens 9.
The amount of movement of the front cover 2 for attachment to the front surface of the front cover can be extremely small. Therefore, this second embodiment can be applied to cameras whose width is relatively short.

In both the first and second embodiments described above, the first operation of opening the front cover 2 brings the camera into the normal photographing state, and the subsequent second operation attaches the filter 8 to the front of the photographic lens 9. It is structured as follows. However, the order of switching between normal photography and photography using a filter may be reversed.

FIG. 7 shows a configuration in which the filter 8 is attached by the first movement of the front cover, and the filter 8 is retracted from the front of the photographing lens and housed in the front cover by the subsequent second movement. FIG. 7 is a plan view of a filter attachment/detachment mechanism showing a third embodiment. FIG. 7 shows a state in which the front lid 2 is closed and the front surface of the photographing lens 9 is covered with the front lid 2.

In FIG. 7, a front cover 2 covering a photographing lens 9 is shown.
is to the right (direction of arrow B) as in the embodiment shown in FIG.
It is configured to be slidable along the front wall of the camera (not shown). A filter holding frame 30 having a filter 8 is rotatably supported by a support shaft 31 implanted on the back surface of the front lid 2, and is supported by a tension spring 3.
2, it is always urged to rotate clockwise about the support shaft 31. Its clockwise rotation is restricted by contacting one end 33a of a sliding member 33 that is slidably provided on the camera body (not shown). This sliding member 33 has a guide groove 3 extending in the same direction as the direction of movement of the front cover 2 (direction of arrow B).
3b, and two guide pins 34 implanted in the camera body are configured to slide within the guide grooves 33b. Further, the sliding member 33 is always urged by a tension spring 35 having a stronger urging force than the tension spring 32 for the filter frame 30 so as to be able to move to the left in FIG. The projection 33c protruding from the side surface of the sliding member 33 comes into contact with a restriction pin 36 implanted in the camera body, so that it is restricted.

On the other hand, a protrusion 39 provided at one end of a pressing lever 38 rotatably supported by a support shaft 37 implanted in the camera body (not shown) engages with the protrusion 33c of the sliding member 33. There is. The pressing lever 38 is always pressed against the support shaft 3 by a tension spring 40 having a weaker biasing force than the tension spring 35 for the sliding member 33.
It is configured such that it is biased to rotate counterclockwise around point 7. In addition, this pressing lever 3
A projecting pin 41 is provided between the support shaft 37 and the protrusion 39 of 8.
is provided, and when the front cover 2 moves to the right in FIG. It is configured so that it can be rotated in the direction.

Since this third embodiment is constructed as described above, it covers the photographing lens 9 and has a filter 8 inside.
The front lid 2 is in the first position as shown in FIG.
When the front cover 2 is moved to the right (in the direction of arrow B) to the second position shown in FIG. 7A and the front cover 2 is opened, the support shaft 31 supporting the filter holding frame 30 also moves to the right. However, since one end 33a of the sliding member 33 is in contact with the filter frame 30, the filter holding frame 30 is moved counterclockwise in FIG. 7 about the support shaft 31 against the urging force of the tension spring 32. As shown in FIG. 7A, the filter 8 is displaced to the front of the photographic lens 9. At this second position, if the front cover 2 is fixed with a fixing means (not shown) (for example, the claw lever 3 and the notch groove 2b ₂ in FIG. 1), the filter 8 can be used to take pictures.

From the second position shown in FIG. 7A,
When the front cover 2 is further moved to the right, the protrusion 2a of the front cover 2 pushes the protrusion pin 41 of the pressing lever 38 into the 7th A
Since it is pushed to the right in the figure, the pressing lever 38 is
Rotate counterclockwise around the center. By rotating the pressing lever 38 in the counterclockwise direction, the pressing lever 38
The protrusion 39 implanted at one end is displaced to the right in FIG. 7A, and presses and displaces the protrusion 33c of the sliding member to the right against the biasing force of the tension spring 35. In this case, since the moving distance of the protrusion 39, that is, the moving distance of the sliding member 33 is larger than the moving distance of the protruding pin 41, that is, the moving distance of the front cover 2, the sliding member 3
3 is relatively displaced to the right with respect to the front lid 2. Therefore, the filter holding frame 30 rotates clockwise around the support shaft 31 due to the biasing force of the tension spring 32, and as shown in FIG. It is housed inside the lid 2. Therefore, if the front cover 2 in the third position shown in FIG. 7B is fixed by a fixing means (not shown) (for example, engagement between the pawl lever 3 and the notch groove _2b3 in FIG. 1), the filter can be fixed. Normal photography without using 8 is possible.

When photographing using the filter 8 again, when the front cover 2 is moved to the left from the third position in FIG. 7B, the pressing lever 38 is moved by the urging force of the tension spring 35. The support shaft 37
At the same time as the sliding member 33 rotates clockwise around , the sliding member 33 is displaced to the left. However, since the amount of displacement of the sliding member 33 is larger than that of the front lid 2, the filter holding frame 30 is pushed by one end 33a of the sliding member 33, and as shown in FIG. 7A, the filter holding frame 30 is pushed by the biasing force of the tension spring 32. The filter 8 is rotated counterclockwise around the support shaft 31 to be attached to the front surface of the photographic lens.

Furthermore, the front cover 2 is moved from the second position shown in FIG. 7A to the first position.
When the sliding member 33 moves to the left to the position, the protrusion 33c comes into contact with the restriction pin 36 and its movement is stopped, so that the pressing lever 38 also stops moving to the left. Therefore, only the front cover 2 moves to the left, and the filter holding frame 30 rotates clockwise about the support shaft 31 due to the biasing force of the tension spring 32, as shown in FIG. It is stored in 2. At the same time, the front cover 2 covers the front surface of the photographic lens 9 to protect the photographic lens 9.

In each of the above embodiments, the front cover 2 is arranged in one direction (the first
4 and 7), the front cover 2 is retracted from the front of the photographing lens 9, and the filter 8 is selectively attached or removed depending on the retracted position of the front cover 2. The configuration is such that switching is performed. However, when the front cover 2 placed in a position to cover the front surface of the photographic lens 9 is moved to one side (for example, to the right), the filter 8 also moves together and retreats from the front surface of the photographic lens 9, and the front cover 2 is moved to the other side. The front cover 2 and the filter 8 may be moved relative to each other so that the filter 8 is positioned in front of the photographic lens 9 when moved to the left (for example, to the left).
In addition, in all of the above embodiments, when the filter is not used, the filter 8 is housed in the front lid 2 (see FIGS. 1, 5, and 7B), so that the filter 8 is not used. 8 is protected against external forces, and at the same time, the reflected light on the surface of the filter does not adversely affect photographing, unlike conventionally known filter housing front lids.

As described above, the camera filter switching device of the present invention includes a front cover supported by the camera body so as to be movable on the front surface of the camera body, and the front cover is moved to the first position covering the front surface of the photographic lens. and a second position retracted from the front surface of the photographic lens and a third position retracted in the same manner, and supported by the front cover so as to be movable in a plane perpendicular to the optical axis of the photographic lens. A filter holding member is provided, and the filter holding member moves between an accommodation position in which the filter is accommodated in a space between the back surface of the front cover and the front surface of the camera body and an escape position in which the filter is removed from the space. , further providing interlocking means for interlocking the front lid and the filter holding member,
This interlocking means positions the filter holding member in the storage position when the front cover is in the first and second positions, and positions the filter holding member in the storage position when the front cover is in the third position. The filter is positioned at the escape position and inserted into the front surface of the photographic lens.

With this configuration, the present invention can achieve the following effects.

(1) By simply moving the front cover from the second position to the third position, the filter holding member inserts the filter into the front of the photographic lens by the action of the interlocking means, so the movement of the front cover and the insertion and removal of the filter can be easily performed. It can be performed in a series of operations and has excellent operability.

(2) Since it is possible to check whether the filter is inserted or not from the position of the front cover, in other words, the front cover has the function of a display member that indicates the insertion/removal status of the filter, so it is possible to misidentify the insertion/removal status of the filter. This can be prevented.

(3) Since the filter holding member is supported by the front cover, both can be made into a unit, which is easier to manufacture than when the filter holding member is housed within the camera body.

[Brief explanation of the drawing]

Figures 1 and 2 are perspective views of the first embodiment of the present invention, with Figure 1 showing the front lid open, Figure 2 showing the filter attached, and Figure 3 showing the implementation of Figure 1. These are explanatory diagrams showing how the filter is installed and removed in this example. Fig. 3a shows the state when the front cover is closed, Fig. 3b shows the state when the front cover is open, and Fig. 3c shows the state when the filter is moving. Figure 3 d shows the filter attached to the front of the photographic lens, Figures 4 to 6 are plan views showing the second embodiment of the present invention, and Figure 4 shows the front cover closed. Fig. 5 shows the state in which the front cover is open, Fig. 6 shows the state in which the filter is attached, and Fig. 7 is a plan view of the third embodiment of the present invention with the front cover closed. This figure and FIG. 7B are plan views respectively showing the mounted state of the filter and the retracted state of the filter in the embodiment of FIG. 7. 1...Camera body, 2...Front cover, 3-6...Fixing means, 8...Filter, 7, 10, 20, 3
0...Filter holding frame.

Claims (1)

[Claims for Utility Model Registration] A first lens that is supported by the camera body so as to be movable on the front surface of the camera body and that covers the front surface of the photographic lens.
a front cover that assumes a second position retracted from the front surface of the photographic lens and a third position similarly retracted from the front surface of the photographic lens; a filter holding member that takes a storage position in which the filter is stored in a space between the back surface of the front cover and the front surface of the camera body and an escape position in which the filter is removed from the space; and the front cover and the filter holding member are When the front cover is in the first position and the second position, the filter holding member is positioned in the housing position, and when the front cover is in the third position, the filter holding member is positioned in the housing position. Position it in the escape position,
A filter switching device for a camera, comprising interlocking means for inserting the filter into the front surface of the photographing lens.