JPH0711660B2 - Filter insertion / extraction device for camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION “Industrial Application Field” The present invention relates to a photographing optical system that can be switched between a photographing state and a non-photographing state, a barrier that hides the photographing optical system during non-photographing, and photographing. The present invention relates to a filter insertion / removal device for a camera including a filter that can be inserted into an optical path.

“Prior art” Conventional cameras are known to change the shooting effect by inserting / removing into / from the shooting optical path, such as a soft focus filter, but the filter can be changed depending on the photographer's judgment and preference depending on the shooting situation. It is used by inserting and removing, and generally, insertion and withdrawal are performed manually based on the photographer's intention to insert and remove the filter.

[Problems to be Solved by the Invention] However, in such a conventional technique of manually inserting and removing the filter, when the filter is once inserted, the filter remains in the optical path unless the user intentionally exits. , Especially in the case of a lens shutter camera, it is not possible to confirm the insertion of the filter with the viewfinder (otherwise if it is done by another means), even if there is no intention of inserting the filter, it may happen that the camera is accidentally inserted while shooting, especially There is a problem that it is very complicated at the beginning of the next shooting after a series of shooting is finished, and in order to prevent it, the condition of the filter must be checked at each start of shooting, which is extremely complicated. It was

The present invention has been made in view of such a conventional problem, and when the main switch of the camera is turned off after the end of shooting, the filter is allowed to exit from the optical path without intention. An object of the present invention is to provide a filter insertion / removal device for a camera that solves the above problems.

“Means for Solving Problems” The gist of the present invention for achieving such an object is to provide a photographing optical system that can be switched between a photographing state and a non-photographing state, and the photographing optical system when not photographing. A device for inserting and removing a filter in a camera including a barrier that hides the system and a filter that can be inserted into a shooting optical path, wherein the drive mechanism of the barrier includes an engaging portion fixed to a camera body, and a shooting state. And an operating member that moves with the taking optical system to engage the engaging portion to conceal the barrier when switching from a non-photographing state to the operation of the operating member of the barrier drive mechanism. The present invention resides in a filter insertion / removal device in a camera, which is equipped with a retracting mechanism that follows the filter to withdraw it from the photographing optical path of the photographing optical system.

"Operation" When the main switch of the camera is turned off after shooting, the shooting optical system begins to collapse into the camera body, and the driven end of the operating member of the drive mechanism of the barrier engages with the engaging part fixed to the camera body. However, due to this engagement, the barrier hides the photographic optical system to protect it.

The operation of this barrier is transmitted to the retracting mechanism of the filter, and when the filter is inserted in the photographing optical path, it is retracted.

During normal shooting, the operating member of the drive mechanism of the barrier is separated from the camera body, the retracting mechanism of the filter is not limited, and the filter can be manually inserted into and removed from the optical path for shooting.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

Each drawing shows an embodiment of the present invention.

As shown in FIGS. 1 to 3, a lens barrel 11 of a photographing optical system 10 appears on the front surface of a camera body 2 of a camera 1 so as to be switchable between a photographing state and a photographed state. The 11 is equipped with various lenses (not shown). The main switch 3 and the shutter release button 4 are provided on the upper surface of the camera body 2.
And are provided.

A pair of barriers 20, 20 is arranged so as to cover the front surface of the lens barrel 11 of the photographing optical system 10, and a barrier drive mechanism 30, a filter 40 to be inserted into and removed from the photographing optical path, and an insertion of the filter. Device
And 50 are provided in the lens barrel 11.

The barriers 20 and 20 have a symmetrical wing shape that conceals the front surface of the lens barrel 11 as indicated by imaginary lines when they match, and they are pivotally attached to the front portion of the lens barrel 11 by pivot pins 21 respectively.

An engagement boss 22 and a biased pin 23 are provided on the base of each barrier 20 in a protruding manner. The biasing spring 24 is wound around the mounting pin 12 fixed to the lens barrel 11 near the biased pin 23, and the biasing spring 24
The urging end 24a of the ridge is engaged with the urged pin 23, whereby the barriers 20 and 20 are urged in the direction to close each other.

The barrier drive mechanism 30 opens and closes the barriers 20, 20 on the front surface of the lens barrel 11 of the photographing optical system 10.

The barrier drive mechanism 30 is built in the lens barrel 11 of the photographing optical system 10 and moves together with the lens barrel 11 when switching from the photographing state to the non-photographing state. Is the main component.

The barrier opening / closing ring 31 is rotatably held on the front end of the lens barrel 11, and barrier opening / closing projections 32, 32 and a driven arm 33 are provided on the outer periphery.
A biased end 34 and an interlocking end 35 are provided so as to project.

The barrier opening / closing projections 32, 32 face the engagement bosses 22, 22 of the barriers 20, 20 and are arranged at positions where the barriers 20, 20 are opened when the engagement bosses 22, 22 are rotated to push the engagement bosses 22, 22. There is.

The driven arm 33 is bent and extends rearward along the optical axis, and the tip thereof constitutes the driven end 33a. The engaging portion 5 is fixedly mounted on the camera body 2 so as to correspond to the driven end 33a of the driven arm 33, and the inclined surface 5a of the engaging portion 5 faces the driven end 33a.

A biasing spring 36 is stretched between the biased end 34 and the pin 13 erected on the lens barrel 11, and the barrier opening / closing ring 31 causes the barrier opening / closing ring 31 to move counterclockwise in FIG. It is urged to open 20. The urging force of the urging spring 36 is larger than that of the urging spring 24 of the barrier 20, and is set so that the barriers 20 and 20 open when the urging spring 36 rotates the barrier opening / closing ring 31.

An insertion / removal device 50 for the filter 40 is provided near the interlocking end 35 of the barrier opening / closing ring 31. That is, the insertion / removal device 50,
The operating member 51 supported rotatably around the optical axis of the photographing optical system 10 is a main component member, and the interlocking receiving end 52 is located at a position facing the interlocking end 35 of the inner barrier opening / closing ring 31 from the operating member 51.
And an operation end 53 is provided so as to project outward.

The support bar 41 of the filter 40 is provided in the groove 55 of the base portion 54 of the operation member 51.
Is inserted and fixed to the end of the support bar 41.
A filter body 43 is supported by the. The support arm 42 is pivotally supported by the lens barrel 11 via a pivot 44, and the lens barrel 11 is fixedly provided with a stopper 14 when the filter body 43 is inserted.

The interlocking receiving end 52 is set to be engageable with the interlocking end 35 of the barrier opening / closing ring 31 only in the direction of retracting the filter body 43 of the filter 40 out of the optical path. The interlocking end 35 of the filter main body of the filter 40
It constitutes a retracting mechanism for retracting 43 out of the photographing optical path of the photographing optical system 10.

Next, the operation will be described.

1 and 2 show when the camera is in a photographing state, the main switch 3 is turned on, the photographing optical system 10 is projected, the barriers 20 and 20 are opened, and the filter 40 is in the photographing optical path. Has been inserted.

In the barrier drive mechanism 30, the driven end 33a of the driven arm 33 of the barrier opening / closing ring 31 is separated from the engaging portion 5 fixed to the camera body 2, and the barrier opening / closing ring 31 is connected to the biasing spring 36. The barrier opening / closing projections 32, 32 push the engaging bosses 22, 22 of the barrier 20 while being rotated by the biasing force, and the barriers 20, 2
0 rotates around the pivot pins 21 and 21 against the urging force of the urging spring 24, and is held in an open state with being separated from each other.

A subject to be photographed which the photographing optical system 10 faces is photographed through the filter 40. Switching between insertion and removal of the filter 40 can be appropriately performed by manually operating the operation end 53 of the operation member 51.

That is, when the operation member 51 is moved around the center of the optical axis by the operation end 53, as shown in FIG. 3, the support bar of the filter 40 held by the groove 55 of the base 54 of the operation member 51 is pushed. Then, the support arm 42 rotates about the pivot 44, and the filter body 43 contacts the stopper 14 to switch between the inserted state and the retracted state.

By setting an appropriate state and pressing the shutter release button 4, desired photography can be performed.

When the photographing is completed and the main switch 3 is turned off, the lens barrel 11 of the photographing optical system 10 is filtered by the electric mechanism (not shown).
Is retracted while still being inserted in the photographing optical path, and accordingly, the driven end 33a of the driven arm 33 of the barrier opening / closing ring 31 abuts on the inclined surface 5a of the engaging portion 5. When the lens barrel 11 is further retracted and stored in the camera body, the driven end 33a is attached to the inclined surface 5a.
The barrier opening / closing ring is guided by the driven arm 33.
31 is rotated clockwise in FIG. 2 against the urging force of the urging spring 36.

When the barrier opening / closing ring 31 rotates clockwise, the barrier opening / closing projections 32, 32 release the engaging bosses 22, 22 of the barrier 20, and the barrier 20 is pivotally supported by the urging force of the urging spring 24. The lens is rotated about, and the front surface of the photographing optical system 10 is fitted and concealed and protected.

Rotating the barrier opening / closing ring 31 causes the filter insertion / removal device 50.
The interlocking receiving end 52 of the operating member 51 of FIG. 3 is pushed by the interlocking end 35 of the barrier opening / closing ring 31, the operating member 51 moves clockwise in FIG. 2, and as a result, as shown in FIG. The lens barrel 11 of the photographic optical system 10 is completely retracted after leaving the optical path and held in that state, and the camera 1 enters the photographic condition shown in FIG.

The lens barrel 11 is used to switch from the photographed state shown in FIG. 4 to the photographing state.
When pulling out, the barrier drive mechanism 30 is also pulled out. When the lens barrel 11 is completely pulled out, the driven end 33a of the driven arm 33 of the barrier opening / closing ring 31 is separated from the engaging portion 5 fixed to the camera body 2.

The barrier opening / closing ring 31 is rotated counterclockwise in FIG. 2 by the urging force of the urging spring 36, the barrier opening / closing projections 32, 32 push the engaging bosses 22, 22 of the barrier 20, and the barriers 20, 20 The pivoting pins 21 and 21 are rotated about the urging force of the urging spring 24, and they are separated from each other and opened.

The interlocking end 35 is also moved by the rotation of the barrier opening / closing ring 31, but the operating member 51 of the filter inserting / removing device 50 is left behind.
Hold the retracted state. That is, at the start of shooting, the filter 40 is always retracted from the shooting optical path, and shooting is started with this as the initial state.

[Advantages of the Invention] According to the filter insertion / removal device in the camera of the present invention, since the filter is always retracted from the photographing optical path at the start of photographing, there is no risk of photographing with the filter inserted by mistake, Since the condition of the filter at the start is clear, it is unnecessary to make a complicated check, and comfortable and reliable shooting can be performed.

[Brief description of drawings]

Each drawing shows an embodiment of the present invention. FIG. 1 is a perspective view of a main part showing the inside of the camera in a photographing state, FIG. 2 is a front view of the main part of the lens barrel, and FIG. FIG. 4 is a cross-sectional view of a main part, and FIG. 4 is a perspective view of the main part showing the inside of the camera in a non-shooting state. 1 ... Camera, 2 ... Camera body 5 ... Engagement part, 5a ... Inclined surface 10 ... Shooting optical system, 11 ... Lens barrel 20 ... Barrier, 30 ... Barrier drive mechanism 31 ... Barrier Opening / closing ring, 33 …… Driven arm 33a …… Driven end, 35 …… Interlocking end 40 …… Filter, 41 …… Supporting bar 42 …… Supporting arm, 43 …… Filter body 50 …… Filter insertion / removal device , 51 …… Operating member 52 …… Interlocking receiving end, 53 …… Operating end 54 …… Base part, 55 …… Groove

Front Page Continuation (72) Inventor Toshio Sora 1-6-3 Nishi-oi, Shinagawa-ku, Tokyo Inside Oi Manufacturing Co., Ltd. of Japan Optical Industry Co., Ltd. (56) References: 60-152138 (JP, U): 62 -125228 (JP, U) Actually opened 59-114537 (JP, U)

Claims (1)

[Claims] 1. A camera provided with a photographing optical system which can be switched between a photographing state and a non-photographing state, a barrier which conceals the photographing optical system during non-photographing, and a filter which can be inserted into a photographing optical path. In the filter insertion / removal device, the drive mechanism of the barrier moves together with the engaging portion fixed to the camera body and the photographing optical system when the photographing state is switched to the non-photographing state. And a retracting mechanism configured to engage with the operating member to conceal the barrier, and to retract the filter to the outside of the imaging optical path of the imaging optical system by following the operation of the operating member of the barrier driving mechanism. An apparatus for inserting and removing a filter in a camera, which is characterized in that