JPS5930890Y2 - Close-up photography permitting device for zoom lenses - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a close-up photography permitting device for a zoom lens used in a small camera or the like.

Generally, zoom lenses used in small cameras and the like are configured so that the focal length can be changed from telephoto to wide-angle by rotating an operating ring on the lens barrel.

Furthermore, there is also a well-known camera that enables close-up photography by rotating the operation ring further than the normal zoom shooting range from telephoto to wide-angle.

In this case, close-up shooting only needs to be possible if the photographer desires it, and in order to prevent lens operation up to the close-up shooting range, which normally makes unnecessary noise, the operating ring should be rotated beyond the wide-angle rotation angle. Press the button so that it cannot move.

If you cancel this restriction and turn the control ring in the close-up shooting range housing, then turn it in the opposite direction and return it to the wide-angle shooting position, you will not be able to take close-up photos unless you release the above restriction. That's what I do.

Various proposals have been made regarding these configurations, but there have been problems such as heavy operation and inability to freely select the rotational position of the zoom operation section.

The purpose of the present invention is to regulate and release close-up photography using a combination of a protrusion provided on the fixed barrel of a zoom lens and a regulating member movable in the optical axis direction provided on the operating member. It is an object of the present invention to provide a close-up photography permitting device for a zoom lens that solves the problem and improves operability.

The present invention will be described below with reference to an embodiment shown in the drawings.

In FIGS. 1 and 2, reference numeral 11 denotes a fixed cylinder, one end of which is attached onto a substrate 13 with a screw 12. In FIG.

A cam cylinder 15 has a cam groove 15a on its curved surface, and is fitted into the inner peripheral surface of the fixed cylinder 11 so as to be rotatable in the circumferential direction.

Reference numeral 11 denotes a lens, which is held in a lens frame 18 located around the lens.

This lens frame 18 is connected to the cam groove 15a via a pin 19.
The guide ball 20 is engaged with the VC and also has one end fixed to the substrate 13.

Therefore, as the cam cylinder 15 rotates, the lens 17 moves along the guide pole 20.

Incidentally, as the lens 17, an aberration correction lens for variable power of a zoom lens is shown, but of course the same lens 17 can also be used.
In front of the lens, there is a variable magnification lens and a focusing lens group that similarly move in the optical axis direction by the rotation of the cam barrel 15.

22 is a cylinder for zoom operation, and on the outer periphery of the fixed cylinder 11,
The fixed cylinder 11 is provided so as to be rotatable along the curve direction.
The cam cylinder 1 is inserted through the pin 23 passing through the cut-off portion 11a
Connect with 5.

The cutout portion 11a allows the range of movement of the pin 23, that is, the range of rotation of the cam cylinder 15 and the zoom operation cylinder 22, to the normal zoom shooting range from telephoto to wide-angle, plus the close-up shooting range. Regulate it so that it can rotate at any angle.

Reference numeral 25 denotes a cylinder for displaying the zoom ratio, which is fixed on the zoom operation cylinder 22 and rotates together with it.

26 is a zoom operation member, and the cylinder 2 for displaying the zoom ratio is
The zoom operation cylinder 22 button and the cam cylinder 15 interlocked with this button are rotated via this cylinder 25.

The zoom operation member 26 has a through hole 26a along the optical axis direction, that is, the horizontal direction in FIG.
is housed so as to be movable along the optical axis direction.

This regulating member 28 is U-shaped, and its lower leg protrudes to the outside through the through hole 26a of the zoom operation member 26 as described above, and the other leg extends from the cylinder 25 for displaying the zoom scale.
, and extends on the outer surface of the fixed tube 11 along the optical axis direction.

The side of the distal end faces the protrusion 30 erected on the outer surface of the fixed cylinder 11 .

Further, the regulating member 28 has a tendency to move toward the left in FIG. 1 due to a spring 29 stretched between the regulating member 28 and the zoom operating member 26.

When the zoom operation member 26 is operated toward the wide-angle side, that is, counterclockwise in FIG. 2, the mounting position of the protrusion 30 is as shown in FIG. Position it so that it is in contact with the

As shown in FIG. 3, a sloped portion 28a is formed on the opposite side of the twisted regulating member 28.

Next, the effect will be explained.

The state shown in FIG. 2 is the limit state on the wide-angle side in the normal zoom photographing range, in which the regulating member 28 is in contact with the protrusion 30 as shown in FIG.

From this state, when the cam barrel 15 is rotated clockwise in the drawing using the zoom operation member 26, it shifts to the telephoto shooting range,
When the pin 23 comes into contact with the upper end of the cutout portion 11a in the drawing, the telephoto limit state is reached.

This 1 shows the normal zoom shooting range, but next we will explain the case of close-up shooting.

In the case of close-up photography, there is a direction in which the zoom operation member 26 is further moved counterclockwise from the state shown in FIG.
9 to the right in the figure to release the contact with the protrusion 30.

That is, the regulating member 28 may be operated as indicated by arrow M in FIG.

By operating in this way, the zoom operation member 26 can be further moved counterclockwise from the state shown in FIG. 2 to bring about a close-up shooting state.

Note that the operation of the regulating member 28 when entering the close-up shooting state is performed by holding the zoom operating member 26 and the regulating member 28 from the front and rear directions from the state where the zoom operating member 26 was separated from both sides. I need to change it, so
There is no need to worry about incorrect operation.

After performing the above operations, if you want to return to the normal zoom shooting range,
The zoom operation member 26 may be moved clockwise in FIG. 2.

In this case, the distal end slope portion 28a of the regulating member 28 is connected to the protrusion 30.
However, the regulating member 28 is driven to the right in FIG. 3 by the slope portion 28a, and automatically releases the contact.
Shifts to normal zoom shooting range.

After this, if the lens is operated in the direction of arrow T in FIG. 3, it will be displaced to the telephoto side.

In the above embodiment, a sloped portion 28a is formed on the regulating member 28 side to automatically release the contact when returning to the normal zoom shooting range side, but as shown in FIG. 30a may be provided, or although not shown,
It may also be provided on portions of the protrusion 30 and the regulating member 28 that face each other.

Next, an embodiment in which the cam cylinder 15 is provided outside the fixed cylinder 11 will be described with reference to FIGS. 5 to 1.

Note that the same reference numerals are given to parts corresponding to those in the above embodiment, and detailed explanation thereof will be omitted.

In this embodiment, the fixed tube 11 is provided with a cutout portion 11b along the optical axis direction as shown in FIG.
A pin 19 set in the lens frame 18 is inserted through the lens frame 18 and engaged with the cam groove 15a of the cam cylinder 15.

Further, on the circumferential surface of the cam cylinder 15, a protrusion 3 provided on the fixed cylinder 11 is provided.
A cut-off portion 1sb that avoids 0 is formed as shown in FIG.

Further, this cam cylinder 15 is integrally connected to a projection 25 for indicating a zoom scale via a screw 32 shown in FIG.

According to the above configuration, by operating the zoom operation member 26 provided on the zoom scale indicating cylinder 25, the cam cylinder 15 is rotated, and the lens 17 is rotated through the pin 19 that engages with the cam groove 15aK. is moved along the optical axis direction.

In this case, the movement of the pin 19 in the optical axis direction is guided by the cut-out portion 1 lb of the fixed barrel 11 and becomes stable.

Further, the rotation of the cam cylinder 15 is caused by the cut-off portion 15b and the fixed cylinder 1.
By engaging with the projection 30 of No. 1, it is restricted to a certain range.

Note that the contact between the regulating member 28 and the protrusion 30 and the release thereof are the same as in the previous embodiment, and the explanation thereof will be omitted.

As described above, according to the present invention, the regulating member does not rub against the protruding member during close-up photography unlike in the prior art, so the operation can be made easier.

In addition, since the protrusion on the fixed cylinder side does not require any dimension in the rotational direction, the rotational position of the zoom operation member can be freely selected.

Furthermore, since the regulating member is moved in the optical axis direction, it can be manipulated regardless of the positional relationship with the protrusion, for example, even when both are in contact with each other.

Further, since the direction in which the regulating member is manipulated is the optical axis direction, the direction in which the zoom operation member is moved is changed when transitioning from normal zoom photography to close-up photography, so there is no need to worry about erroneous operation.

As a result, operability is greatly improved.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view showing an embodiment of the zoom lens close-up photography permitting device according to the present invention, Fig. 2 is a cross-sectional view taken along the line ■-■ of Fig. 1, and Fig. 3 is a 1/7th embodiment of the present invention. FIG. 4 is an enlarged partial view showing the relationship between the regulating member and the protrusion, FIG. 4 is a partially enlarged view showing another embodiment of the portion shown in FIG. 3, and FIG. Top view, Figure 6 is Vl-V of Figure 5
FIG. 1 is a partially enlarged view showing the relationship between the regulating member and the protrusion in this embodiment. 11...Fixed barrel, 17...Lens, 2
6...Zoom operation member, 28...Regulation member, 28a, 30a...Slope portion, 30...
···protrusion.

Claims (1)

[Scope of utility model registration request] In a device in which the rotation angle of the zoom operation member relative to the fixed barrel is expanded beyond the normal zoom shooting angle to enable close-up photography, the zoom operation member comes into contact with a protrusion provided on the fixed barrel and approaches the close-up. A regulating member movable in the direction of the optical axis is provided to prevent rotation toward the photographing range, and this regulating member is given a habit of moving to a position where it is always in contact with the projection, and a part of the regulating member can be pushed to the outside for operation. At least one of the protrusions and the regulating member protrudes and is configured to be able to release the contact with the protrusion, and is in contact with the regulating member when the zoom operation member rotates from the close shooting range to the normal zoom shooting range. A close-up photography permitting device for a zoom lens, characterized in that a slope portion for moving the regulating member in a direction of releasing the contact with the protrusion is formed on the member.