JPS62262839A - Inserting and detaching device for soft focus filter in camera - Google Patents

Abstract

PURPOSE:To naturally insert and detach a soft focus filter in accordance with the photographing state of a camera, by providing a mobile means for withdrawing a released soft focus filter to the outside of a photographing optical path. CONSTITUTION:The soft focus filter 30 of an inserting and detaching device 20 is installed to the tip of a holding member 31, and the holding member 31 is supported so as to be rocked by a lens barrel 10 through a pivotal shaft 31a being parallel to a photographing optical axis, and also, energized so that the soft focus filter 30 is withdrawn to the outside of a photographing optical path by an energizing spring 40. The energizing spring 40 becomes a mobile means for withdrawing the soft focus filter 300 to the outside of the photographing optical path, when it is released. In such way, at the time of telephoto photographing of a long focus, the soft focus filter 30 can be held in an inserted state to the photographing optical path, and also, can be held in a withdrawn state, as well, and photographing utilizing appropriately the soft focus filter 30 can be executed.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a device for inserting and removing a soft focus filter in a camera whose focal length can be changed.

"Prior Art" Soft focus filters are known to have the effect of making fine wrinkles and the like in the photographed object less noticeable, thereby improving the photographic appearance.

This soft focus filter is effective in long-focus photography that shows a close-up of a person, and is particularly effective with a so-called portrait lens of 70 to 80 mm. On the other hand, during short-focus photography such as wide-angle photography, people are rarely photographed in close-up, and the subject does not stand out because the background is not blurred.

Therefore, soft focus filters are not necessarily effective, and if used too often, they may give the viewer a bad impression of the lens's poor descriptive performance or lack of focus, or may give a persistent impression.

When using a soft focus filter with a camera that can switch the focal length, in order to take advantage of the characteristics of the soft focus filter as described above, it is necessary to insert or remove the soft focus filter into the photographing optical path depending on the shooting conditions. .

``Problems to be Solved by the Invention'' However, with such conventional technology, since the camera is capable of changing the focal length and the focal length can be changed relatively frequently, It is extremely troublesome to insert and remove the soft focus filter accordingly, and there is a problem in that it is difficult for beginners to distinguish between different uses, making it virtually impossible to use the soft focus filter.

The present invention has been made by focusing on these conventional problems, and provides a soft focus filter for cameras that solves the above problems by allowing the soft focus filter to be inserted and removed naturally according to the shooting conditions of the camera. The purpose is to provide an insertion/removal device.

"Structure of the Invention" The gist of the present invention to achieve the above object is to provide an insertion/removal device for a soft focus filter in a camera capable of switching the focal length, which is a device for inserting and removing a soft focus filter in a photographing optical system. It is supported so that it can be inserted and removed into the optical path, and the soft focus filter can be restrained in the optical path during long focus photography, and a locking mechanism is provided to release the soft focus filter during short focus photography, and the released soft focus filter can be photographed. The present invention relates to a device for inserting and removing a soft focus filter in a camera, characterized in that it is provided with a moving means for moving it out of the optical path.

``Function'' However, during long focus photography where it is effective to use a soft focus filter, once the soft focus filter is inserted into the photographing optical path, the locking mechanism locks the soft focus filter while it is inserted into the photographing optical path. , the soft focus filter can continue to be used without requiring any further operations.

During short-focus photography, where it is not very effective to use a soft focus filter, the soft focus filter is not restrained by a mechanism, and if the soft focus filter is inserted into the photographing optical path, the moving means will move out of the photographing optical path. to be evicted.

During short-focus photography, it is possible to insert the soft focus filter into the photographing optical path against the moving means and hold it while taking pictures, but when you stop holding it, the moving means moves the soft focus filter out of the photographing optical path. It is.

“Example J Hereinafter, one embodiment of the present invention will be described based on the drawings.

Each figure shows one embodiment of the invention.

As shown in the first rEJ, a lens barrel 10 of a camera whose focal length can be changed is equipped with a main lens 11 and a switching lens 12. The insertion/removal device 20 supports the soft focus filter 30 so as to be inserted into/removed from the photographing optical path passing through the central axis of the main lens 11. Figures 2 and 3
As can be seen in the figure, between the main lens 11 and the film surface 13, an aperture/shutter 14. Soft focus filter 30. A switching lens 12 is arranged.

The switching lens 12 is swingably supported by the lens barrel 10 via a pivot 12a, and can be inserted and held in the photographing optical path by a switching mechanism (not shown).As shown in FIG. When the switching lens 12 is inserted into the photographing optical path, it is a telephoto photographing state, which is long-focus photographing, and when the switching lens 12 is not inserted into the photographing optical path, as shown in FIG. 3, it is short-focus photographing. The camera is in wide-angle shooting mode.

The insertion/removal device 20 is built into the lens barrel 10, and moves together with the moving portion of the lens barrel when switching the imaging state.

The soft focus filter 30 of the insertion/removal device 20 is attached to the tip of a holding member 31, and the holding member 31 is swingably supported by the lens barrel 10 via a pivot 31a parallel to the photographing optical axis, and is supported by a biasing spring. At 40, the soft focus filter 30 is urged to move out of the photographing optical path. The biasing spring 40 constitutes one stage of movement for moving the soft focus filter 30 out of the photographing optical path when it is released.

The base 32 of the holding member 31 has a disc shape, and the base 32
An operating lever 33 extends around the outer periphery of the lens barrel 1O, and the tip of the operating lever 33 projects outward from a circumferential slot 15 formed in the lens barrel 10 to form an operating knob 34.

A locking means 50 is provided near one edge of the disc-shaped base 32 of the holding member 31. That is, the locking means 50 includes a notch 51 for the test object carved on one edge of the disc-shaped base 32 of the holding member 31, and a locking device that engages and disengages from the notch 51 for the object to be locked. The lever 55 is disposed facing a cam pin 59 protruding from the camera body (not shown).

The locking lever 55 is pivoted to the lens barrel 10 by a pivot shaft 55a parallel to the photographing optical axis, and has an engaging end 56 that engages and disengages from a notch 51 formed in the base 32 of the holding member 31. one arm has an inclined surface 56 on one side of the engaging end 56.
a is formed, and this inclined surface 56a serves as a locking notch 51 of the holding member 31 of the soft focus filter 30.
The engaging end 56 is in contact with the side edge of the notch 51 for the test subject II-.
It is designed to fit.

A support piece 57 is newly installed at the tip of the other arm extending from the pivot shaft 55a of the locking lever 55, and a follower pin 58 that can be engaged with the cam pin 59 is implanted in the support piece 57.

The locking lever 55 is biased by a spring 55b in a direction in which the engaging end 56 engages with the notch 51 for being locked, and the follower pin 58
is the engaging end 5 when it comes into contact with the inclined surface 59a of the cam pin 59.
6 is removed from the notch 51 for being locked.
5 is arranged at a rotating position.

Next, the operation of this embodiment will be explained.

Figure 1 shows the camera in telephoto shooting mode, with switching lens 1
2 is inserted into the photographing optical path, and the part that moves by switching the photographing state of the lens barrel 10 is moving forward, and the follower pin 58 of the 1 locking lever 55 is disengaged from the cam pin 59.

Since the follower pin 58 is disengaged from the cam pin 59, the engagement 11-lever 55 is in a state where it can rotate in the direction in which the engagement end 56 engages with the notch 51 to be engaged by the biasing force of the spring 55b. In Figure 1, soft focus filter 3
0 is inserted into the photographing optical path, the engaging end 56 engages with the locking notch 51, and the soft focus filter 30 is held in the inserted state.

The arrangement of the optical system in this state is as shown in FIG. 2, and the object to be photographed toward which the main lens 11 is directed is mapped onto the film surface 13 through the soft focus filter 30 and photographed. The soft focus filter 3 is continuously removed unless the soft focus filter 30 is intentionally removed from the photographing optical path.
You can take pictures using 0.

When you want to remove the soft focus filter 30,
Operate the operation knob 34 at the end of the operation lever 33 of the holding member 31 of the soft focus filter 30 with your finger to remove the lens barrel 10.
Apply a little force so that the operating knob 34 at one end of the slot 15 moves toward the other end. The inclined surface 56a of the engaging end 56 of the locking lever 55 is pushed by the side edge of the notch 51 for being locked, and the locking lever 55 rotates slightly against the biasing force of the spring 55b and is locked. The end 56 rides on the disc edge of the base 32 of the holding member 31, the engaging end 56 comes off the locking notch 51, and the locking lever 55 is released.

If the operating knob 34 is moved to the other end of the slot 15 of the lens barrel 10, the holding member 31 rotates and the soft focus filter 30 is removed from the photographing optical path. Since the urging spring 40 urges the holding member 31 of the soft focus filter 30, the soft focus filter 30 is held in the retracted state even if the operating knob 34 is released.

To insert the soft focus filter 30 into the photographing optical path, hold the operating knob 34 of the holding member 31 of the soft focus filter 30 and move it from the other end of the slot 15 to the one end. At the position where the holding member 31 rotates and the soft focus filter 30 is inserted into the photographing optical path, the notch 51 for being locked and the engaging end 5 of the locking lever 55
6 and the engagement end 56 is the notch 51 for being locked.
The holding member 3 of the soft focus filter 30 is fitted into the
1 is locked. The locking force is stronger than the biasing force of the biasing spring 40, and the soft focus filter 30 is held at the inserted position in the same manner as described above.

In this way, during long-focus telephoto shooting, the soft focus filter 30 can be maintained either in the inserted state or in the removed state from the photographing optical path, and the soft focus filter 30 can be appropriately used for photographing. be able to.

When a switching operation is performed from the telephoto shooting state to the wide-angle shooting state shown in FIG. 1, the movable portion of the lens barrel 10 moves backward, and the insertion/removal device 20 also moves back. When moving backward, the locking lever 55
The follower pin 58 contacts the inclined surface 59a of the cam pin 59, and the engaging end 56 of the locking lever 55 is in contact with the notch 5 for being locked.
The holding member 31 of the released soft focus filter 30 is rotated by the urging force of the urging spring 40, and the soft focus filter 30 is removed from the photographing optical path. The switching lens 12 has also moved out of the photographing optical path, and the arrangement of the photographing optical system is as shown in FIG.

Normally, the soft focus filter 30 is not used during wide-angle shooting, so even if you use the soft focus filter 30 during telephoto shooting and then switch to wide-angle shooting, the soft focus filter 30 will move out of the shooting optical path, resulting in erroneous shooting. I never do.

In the wide-angle shooting state, the follower pin 58 is always connected to the cam pin 5.
9, the locking lever 55 is restrained in a position where the engaging end 56 does not engage with the notch 51 for being locked, and the holding member 31 of the soft focus filter 30 is released. has been done.

If it is desired to use the soft focus filter 30 in a wide-angle photographing state, hold the operating knob 34 for rotating the holding member 31 of the soft focus filter 30 at the other end of the slot 15 and move it to the one end. Then, the holding member 31 rotates and the soft focus filter 30 is inserted into the photographing optical path, and if the user holds the operating knob 34 with his or her finger and photographs, the soft focus filter 30 can be used for photographing.

Even when shooting using the soft focus filter 30 in a wide-angle shooting state, if you release your hand from the operation knob 34 of the holding member 31 of the soft focus filter 30, the insertion/removal device 20
is not working, the holding member 31 is rotated by the biasing force of the biasing spring 40, and the soft focus filter 30 is removed from the photographing optical path.

In other words, in a wide-angle shooting state, taking a picture using the soft focus filter 30 is a special kind of shooting, so the soft focus filter 30 cannot be held during shooting restraint unless the photographer operates it intentionally. .

When switching from a wide-angle shooting state where the soft focus filter 30 is removed from the shooting restraint to a telephoto shooting state, the insertion/removal device 20 moves forward due to switching of the lens barrel 10, and the follower pin 58 is disengaged from the cam pin 59. The locking lever 55 is then released from its restraint, and the retaining end 56 rides on the disk edge of the base 32 of the holding member 31.

Therefore, the holding member 31 of the soft focus filter 30
When the operating knob 34 for rotating is moved with a finger from the other end to the one end, the soft focus filter 30 is inserted into the photographing optical path, and the notch 51 for being locked and the engaging end 56 are inserted.
The engaging end 56 is aligned with the notch 51 for being locked.
Even if the holding member 3 is engaged and the operation knob 34 is removed, the holding member 3
1 stops at that position, and the soft focus filter 30
is kept in the inserted state.

That is, as mentioned above, during long-focus telephoto shooting, the soft focus filter 30 can be maintained in the inserted state into the photographing optical path, and can also be held in the withdrawn state, so that the soft focus filter 30 can be appropriately soft-focused. Photography can be performed using the focus filter 30.

In the above embodiment, the locking mechanism is switched between the soft focus filter locking state and the locking disabled state using the switching operation of the lens barrel. Any locking mechanism may be used as long as the state is switched by the locking mechanism, for example, it may be a locking mechanism that switches the state electrically.

Further, although the spring is used to move the soft focus filter 30 out of the photographing optical path, it may be electrically switched, for example, to move the released soft focus filter out of the photographing optical path.

Also, rather than a camera that changes the focal length intermittently,
It goes without saying that the present invention can also be applied to devices that switch continuously.

"Effects of the Invention" According to the soft focus filter insertion/removal device in a camera according to the present invention, when switching between long focus photography and short focus photography, the soft focus filter can be used in a natural manner, This eliminates the possibility of erroneous shooting, and even beginners can easily use the soft focus filter.

[Brief explanation of drawings]

Each figure shows an embodiment of the present invention. Figure 1 is a perspective view of the main parts showing the inside of the lens barrel, Figure 2 is a vertical cross-sectional view of the optical system in a long focus shooting state, and Figure 3 is a short perspective view of the optical system. FIG. 3 is a longitudinal cross-sectional view of the optical system in a focused photographing state. 10... Lens barrel 11... Main lens 12.
...Switching lens 13...Film surface 2o...
Insertion/removal device 30...soft focus film 31...holding member 33...operation lever 34
...Operation knob 40...Kise spring (movement means) 5
0...Locking means 51...Notch 5 for being locked
5... Lock lever 56... Engagement end Fig. 1

Claims (1)

[Claims] An insertion/removal device for a soft focus filter in a camera whose focal length can be changed, which supports the soft focus filter so that it can be inserted into and removed from the photographing optical path of a photographing optical system, and which supports the soft focus filter during long focal length photographing. A camera that is capable of locking a filter in a photographing optical path, is provided with a locking mechanism for releasing the soft focus filter during short focus photography, and is provided with a moving means for moving the released soft focus filter out of the photographing optical path. Soft focus filter insertion/removal device.