JPH01113712A - Interchangeable lens - Google Patents

Abstract

PURPOSE:To perform the focusing operation and the close-up operation independently of each other and to efficiently improve the operability of zooming and close-up by performing the zooming operation and the close-up operation with the same ring. CONSTITUTION:When a zoom operation ring 18 is moved forward, a focusing ring 16 and a holding ring 14 are moved forward through a moving ring 12 and a lens group L1 is moved. At this time, lens groups L2 and L4 are moved to prescribed positions through a moving ring 26 and a holding ring 34 by engagement between a cam groove 20b for zoom photographing and a pin 30 in accordance with rotation of a cam ring 20, thereby zooming. In case of close-up, the ring 18 is moved forward up to the end position and the ring 18 is rotated thereafter. At this time, when the ring 12 goes straightly, the ring 20 is rotated clockwise more than zooming and lens groups L2 and L4 are moved to positions most suitable for close-up.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a close-up photographing device using an interchangeable lens.

[Prior art and its problems] In conventionally known close-up photography devices, zooming and focus adjustment are each performed by moving or rotating one operation ring, and close-up photography is performed by moving a single operating ring straight or rotating, and close-up photography is performed by moving a single operation ring on the closest side of the focus adjustment. There are some that are further extended. however,
In this method, the close-up photography operation is an extension of the focus adjustment operation on the close-up side, or in other words, the focus adjustment operation and the close-up photography operation are not independent, resulting in the following problems.

That is, if you want to take a picture at a certain distance between infinity and close-up, move the focus adjustment device to the close-up position, take close-up shots, and then take a picture at the same distance as before, you must move the focus adjustment device back to its original position. It is difficult to take pictures quickly because it takes time and effort to adjust the position.Also, since the close-up shooting area is an extension of the focus adjustment area, the same optical system is used for close-up shooting and focus adjustment. Only the optical system can be moved (other optical systems cannot be moved), making it difficult to improve optical system performance such as resolution during close-up photography.

In addition, models that have a separate operation ring for close-up shooting do not have the above-mentioned problem, but since the operation ring for close-up shooting is separate from the operation ring for zooming, it is difficult to change the operation ring from zooming to close-up shooting. There was a problem in that it was necessary to change the operating ring when moving to an operation, resulting in poor operability.

As another conventional example, a zoom operation ring and a focus adjustment ring are provided separately, focus adjustment is performed by rotating the focus adjustment ring, and zooming is performed by rotating a cam ring by rotating the zoom operation ring and using a zoom cam. To take pictures, rotate the zoom operation ring further from the rotation end when operating the zoom, and use the close-up cam, which is an extension of the zoom cam on the cam ring, to move each optical system to the close-up position to take close-up pictures. There is something.

However, in this conventional example, since focus adjustment and zooming are performed using separate operation rings, it is necessary to switch each operation ring between focus adjustment and zooming, and it takes time to move from focus adjustment to zooming or vice versa. ,It takes time and effort. In addition, the operability is poor in that focus cannot be controlled while zooming.Furthermore, the rotation angle of the zoom operation ring is the sum of the rotation angle for zooming and the rotation angle for close-up shooting, so the rotation angle is growing.

As a result, the internal space for the rotation of the transmission mechanism that transmits the driving force from the operating ring to the lens becomes large, and the lens barrel becomes large in order to accommodate other mechanisms.

As another conventional example, a zoom operation ring and a focus adjustment ring are provided separately, focus adjustment is performed by rotating the focus adjustment ring, zooming is performed by moving the zoom operation ring straight, and the close-up side limit of the focus adjustment ring is set. Some types of close-up photography are performed using a protrusion of a zoom operation ring, and the position of the close-up limit is changed by rotating the zoom operation ring, thereby further moving the lens group that moves during focus adjustment.

However, even in this conventional example, the limit position of the focus adjustment ring is changed by rotating the zoom operation ring, so when taking close-up shots, hold the zoom operation ring in your hand and rotate it, then place your hand on the focus adjustment ring. It is necessary to switch to the camera and operate the focus adjustment ring, which results in poor operability.Also, as mentioned in the first conventional example, it is not possible to quickly switch between normal photography and close-up photography. ,
There was a problem that it was difficult to improve optical performance such as resolution. In addition, the rotation limit position of the focus adjustment ring is changed by rotating the zoom operation ring, so when the moving optical system has a large amount of movement from close-up to close-up shooting, the rotation limit position of the focus adjustment ring changes from the close-up position to close-up shooting. The rotation angle also increases, and inevitably the rotation angle of the zoom operation ring also increases.

As a result, the rotation angle of the zoom operation ring for close-up photography may be close to 180 degrees, and there is also the problem that it is difficult to operate.

The present invention solves the problems in the conventional example described above.
That is, it is an object of the present invention to provide a close-up photographing device with an interchangeable lens that has good operability for focus adjustment and zooming, has independent focus adjustment operations and close-up photographing operations, and can perform zooming and close-up photographing without changing hands. It was done for a purpose.

(Means and Utilization for Solving the Problems) In order to solve the above problems, the present invention provides a focusing ring that is rotatable around the optical axis and a focusing ring that is movable in the optical axis direction and a zoom operation ring that is rotatable at the end of the movement in the axial direction; a focus adjustment control device that moves the focus adjustment optical system by rotation of the focus adjustment ring; and a focus adjustment control device that moves the focus adjustment optical system by the rotation of the focus adjustment ring; At the moving end of the zoom shooting control device in the optical axis direction of the zoom operation ring, the close-up optical system including a part of the zoom shooting optical system is moved by rotation of the zoom operation ring, and the close-up optical system including a part of the zoom shooting optical system is moved. A close-up photography control device configured in series with a zoom photography control device, so that the rotational operation of the zoom operation ring during close-up photography can be performed independently of the rotational operation of the focus adjustment ring during focus adjustment. I made it.

(Example) Embodiments of the present invention will be described below based on the drawings.

In this example, the present invention is applied to an interchangeable lens that can be manually and automatically focused.

In FIG. 1, the fixed lens barrel lO is the main body portion 10a.

It consists of a large diameter part 10b, a small diameter part 10c, and a lens holding part 10d, and is attached to a camera body (not shown) at a mount part 10e at the rear end of the main body part 10a. Large diameter part 10b
A protrusion 10f is formed at the tip, and straight grooves 10g and 10h in the optical axis direction are formed in the small diameter portion 10c. A third lens group L3 is held in the lens holding portion 10d.

A first group moving ring 12 is fitted inside the small diameter portion 10c of the fixed lens barrel 10, and three screws 1 are attached to the extension portion 12a of the first group moving ring 12.
2b, 12c, and 12d are formed. screw 12
b is a first group holding ring 14 that holds the first lens group L1;
A screw 14a of the focus ring 16 is screwed into the screw 12c, and a screw 16a of a focus ring 16 is screwed into the screw 12c.

Only rotation is transmitted from ring 16 to ring 14.

The protrusion 14b of the ring 14 is inserted into the straight groove 16c of the ring 16.
is inserted. A zoom operation ring 18 is attached to the screw 12d.
The zoom ring 18 has an L-shaped groove isb into which the screw 18a is screwed.

The projection 10f of the large diameter portion 10b is fitted into the projection 18c (consisting of the optical axis direction portion 18b and the circumferential direction portion 18c). Therefore, the ring 18 cannot rotate during movement, but can only move in the optical axis direction, and can rotate only at the forward end (telephoto end).

A cam ring 20 is installed on the outside of the small diameter portion 10c of the fixed lens barrel 10.
The cam ring 20 is fitted with cam grooves 20a and 20b, and the rear end portion is a large diameter portion 20c, and a brush 22 is disposed between this portion and the small diameter portion 10c. 22 is in contact with the encoder 23. As shown in FIG. 2, the middle portion of the cam groove 20b is bent toward the rear end of the lens (to the right in FIG. 1), and includes a cam groove 20b for zoom photography and a cam groove 20b2 for close-up photography. It consists of. A pin 24 erected on the main body portion 12e of the first group movable ring 12 is fitted into and engaged with the linear groove 10g and the cam groove 20a. As shown in FIG. 3, the cam groove 20a
consists of a cam groove 20a1 for zoom photography and a cam groove 20a2 for close-up photography.

A notch 12f is formed in the free end of the main body portion 12e of the first group moving ring 12, and by utilizing this, that is, the small diameter portion 10c
A second group moving ring 26 is disposed inside. The bottle 30 installed upright on this ring 26 has a straight groove 10h and a cam! It fits into and engages with 20b. Further, a retaining ring 34 holding the fourth lens group L4 is attached to the rear end of the second group moving ring 26 by screws 35. Also,
The cam ring 20 is provided with a groove (not shown) extending in the circumferential direction, and a pin (not shown) provided upright on the small diameter portion 10c of the fixed lens barrel 10 is fitted into and engaged with this groove.
The cam ring 20 can only rotate.

A driving force transmitting ring 32 that rotates by receiving a driving force from the camera body is fitted and held inside the large diameter portion 10b of the fixed lens barrel 10, and an extension portion 16b of the focusing ring 16 is fitted into the groove 32a of the ring 32. are doing.

Next, the operation of this embodiment will be explained.

First, automatic focus adjustment (autofocus) will be explained. When the rotational driving force of the motor within the camera body is transmitted to the driving force ring 32 by a transmission mechanism (not shown), this driving force is transmitted to the focusing ring 16 through the groove 32a and the extension 16b, and through the groove 16c and the protrusion 14b. The signal is transmitted to the first group holding ring 14, and the ring 14 rotates. Here, the first group holding ring 14 is the first group moving ring 1
2, the moving ring 12 is screwed into the bin 24 and the straight groove 10.
Since the retaining ring 14 is held unrotatable by engagement with the movable ring 12, the retaining ring 14 rotates with respect to the movable ring 12 by the driving force from the camera body and moves in the optical axis direction. As a result, the first lens group moves in the optical axis direction to achieve automatic focusing.

Next, manual focus adjustment (manual focus) is performed by cutting off the connection with the driving force on the camera body side on the camera body side or the interchangeable lens side, and rotating the focus adjustment ring 16 through engagement between the protrusion 14b and the groove 16c. 1st group retaining ring 1
4 and move the lens group □ in the optical axis direction.

To zoom, the zoom operation ring 18 is moved forward. Then, the focusing ring 16 and the first group holding ring 14 move forward via the moving ring 12. Accordingly, the first lens group Ll moves. At this time, the first
Since the movable ring 12 cannot rotate due to the engagement between the groove 10g and the bin 24, the movable ring 12 moves straight and the bin 24 moves along the straight groove Log (to the left in Fig. 1, to the left in Fig. 2). The cam ring 20 rotates to the right in FIG. 2 through the engagement between the bin 24 and the zoom photographing cam groove 20a1, and shifts to the state shown in FIG. 3. As the cam ring 20 rotates, the cam groove 20b moves to the right in FIG. Zooming is performed by moving the second and fourth lens groups L2 and L4 to predetermined positions, respectively (to the right in FIG. 1 and to the bottom in FIG. 2).

Close-up photography is performed by moving the zoom operation ring 18 to the forward end (telephoto end) position and then rotating the operation ring 20.
That is, when the ring 18 is rotated, the protrusion 10f enters the circumferential groove 18c from the straight groove 18b after the state shown in FIG.
The ring 18 is rotatable but cannot move straight. At this time, since the moving ring 12 cannot be rotated as described above, when the zoom operation ring 18 is rotated, it moves straight through the engagement of the screws 12d and 18a, and passes through the retaining ring 14 to the lens group. Move L1. In addition, the moving ring 12
When the camera moves straight, the cam groove 20a2 for close-up photography and the bin 24
By engaging with the cam ring 20, the cam ring 20 rotates further to the right than during zooming, and the cam groove 20b2 for close-up photography and the bin 3
0, the second and fourth lens groups L2 and L4
Move the camera to the optimal position for close-up photography. That is, during close-up photography, the 1st, 2nd and 4th lens groups L1. L and L4 move in the optical axis direction in the same direction as during zooming.

Note that during these zooming and close-up shooting, the transmission ring 32, focus adjustment ring 16, and first group holding ring 14
Since it is not limited by the zoom operation ring 18 or the like, automatic focus adjustment and manual focus adjustment are possible regardless of the zooming position and close-up shooting state.

The effects obtained by this example are as follows.

First, the focus adjustment ring 16 and the zoom operation ring 18 are independent; automatic focus adjustment is performed by rotating the ring 16, zoom photography is performed by moving the zoom ring 18 straight, and close-up photography is performed using the zoom This is done by rotating the zoom ring 18 at the end of the movement in the optical axis direction of the ring 18. Therefore, the zoom operation ring 18 is gripped by hand to zoom, and in this state, the focus adjustment ring 16 is adjusted with a fingertip.
The focus can be adjusted by rotating the zoom ring 18, and close-up photography can be taken by rotating the zoom operation ring 18. In this way, three types of photographing operations can be performed without changing the ring.

Second, since the manual focus adjustment operation and the close-up shooting operation are independent, the zoom operation ring 18 is rotated after moving forward while the focus adjustment ring 16 is set at an arbitrary position to perform close-up shooting and the shooting is completed. If the ring 18 is then rotated and then moved back, the original in-focus state is immediately restored and photography can be taken at any initial distance.

Third, the first lens group L and □ are moved during focus adjustment, and the first, second and fourth lens groups are moved during close-up photography.
, Lx, and L4, that is, different lens groups are moved in both cases, so the optical characteristics during close-up photography can be improved.

In this connection, the linear groove Log used during zooming
And by extending the cam groove 20am and 20bt (straight groove L
og and cam grooves 20a2, 20bz) Since they are used for close-up photography, the amount of movement of the second and fourth lens groups L2 and L4 can be arbitrarily set during close-up photography, and the optical characteristics for close-up photography can be improved.

Fourth, the cam ring 2 is used both when zooming and when taking close-up shots.
0 only rotates and does not move in the optical axis direction, the focal length information of the encoder 23 can be extended to provide a close-up shooting information position for the encoder 23 and the brush 22, and the connection between the encoder 23 and the brush 22 The related structure becomes simpler.

Fifth, this lens barrel is capable of manual and automatic focus adjustment, so if you want to take close-up shots during automatic focus, just rotate the zoom operation ring 18 to match the desired magnification.
The driving force transmission ring 32, the focus adjustment ring 16, etc. move the lens group to adjust the focus.

Sixth, even if the amount of movement of the lens group L8 is large during close-up shooting, the rotation angle of the zoom operation ring 1-8 can be made appropriate by increasing the lead of the threaded portion between the rings 18 and 12. Can be done. Even in types of lenses in which the amount of movement of the first lens group □ is different, the operation of the zoom operation ring 18 during close-up photography can be unified by adjusting the lead of the threaded portion.

It should be noted that the present invention is not to be construed as being limited to the above-mentioned embodiments, and it goes without saying that changes and improvements can be made as appropriate within the scope of the invention.

For example, instead of the first group moving ring 12, the cam ring 2
Alternatively, the pin 24 may be provided upright at the end of the ring 12 and engaged with a cam groove formed in the ring 12 and a lead groove formed in the fixed lens barrel 10.

In addition, it is mechanically possible for the second and fourth lens groups L2 and L4 to move in the optical axis direction while rotating during zooming and close-up photography, so focal length information is not necessary or may be provided elsewhere. If possible, the second group moving ring 34 is fitted inside the first group moving ring 12, and the pin 30 is engaged with the cam groove formed in the ring 12 and the cam groove formed in the fixed lens barrel 10. It is also possible to omit the cam ring 20. Further, the fourth lens group L4 is held by a separate (dedicated) moving ring from the second lens group L2, and a bottle set upright on this moving ring is connected to the fixed lens barrel 10 and the cam ring 20 or the first group moving ring 12. By engaging with the cam groove formed in the cam groove, the second lens group L2 and the fourth lens group L4 can be made to move separately during zooming and close-up photography.

[Effects of the Invention] As described above, according to the present invention, it is possible to instantly switch from an infinity focusing state to a close-up shooting state, or vice versa, making close-up shooting easier and more convenient. greater flexibility. Furthermore, zooming operations and close-up photography operations can be performed using the same ring, making it unnecessary to change the operation ring when changing operations, making photography easier.

Furthermore, since the optical system that moves during close-up photography can be made independent of the optical system that moves during focus adjustment, the optical characteristics during close-up photography can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention, and FIGS. 2 and 3 are developed views of a straight groove and a cam groove in the above embodiment. [Explanation of symbols of main parts] L,, L2. L,,L,...Lens group 10...Fixed lens barrel 12...First group moving ring 16...Focus adjustment ring 18...Zoom operation ring 20...Cam ring 24.30... - Bin Log, 10h... straight grooves 20a, 20b - cam grooves

Claims (1)

[Scope of Claims] A focus adjustment ring that is rotatable around the optical axis; a zoom operation ring that is movable in the optical axis direction and rotatable at a moving end in the optical axis direction; a focus adjustment control device that moves the focus adjustment optical system; a zoom shooting control device that moves the zoom shooting optical system by moving the zoom operation ring in a straight line; and a zoom shooting control device that moves the zoom shooting optical system by moving the zoom operation ring straight; and a close-up photography control device that moves a close-up optical system including a part of the zoom photography optical system by rotation of a zoom operation ring, and is configured to be continuous with the zoom photography control device, during close-up photography. An interchangeable lens characterized in that the rotational operation of the zoom operation ring can be performed independently of the rotational operation of the focus adjustment ring during focus adjustment.