JPH0518083B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a lens barrel equipped with a macro photography mechanism, and in particular, a lens barrel that allows macro photography only when the zooming optical system is in a predetermined position. This invention relates to a zoom lens barrel equipped with functions that allow

Special Publication No. 41483 of 1982 is known as a zoom lens barrel with a macro photography mechanism.

[Conventional technology]

The macro mechanism disclosed in the above-mentioned Japanese Patent Publication No. 58-41483 has a zoom operation member, and the zoom operation member and the macro operation member move together in the direction along the optical axis during zooming, especially when focusing at the wide-angle end. The macro operation member is provided with a click mechanism that prevents the macro photography operation. The click mechanism in the zoom lens barrel has a first operating ring for zooming operation and a second operating ring for macro photography that are arranged overlapping each other, and the first and second operating rings are moved together along the optical axis. This is to prevent the second operation ring for macro operation from moving when performing a focusing operation at the wide-angle end. However, if the first and second operating rings are placed one on top of the other, especially when the first and second operating rings are located close to each other (to make the lens barrel more compact), the first and second operating rings may overlap. However, if you make a mistake in selecting the operating ring, or if you try to use the second operating ring for macro photography, the operating force may be different from the first and second operating rings. This may cause problems such as working on both operating rings.

[Characteristics of the Invention] The present invention makes the optical system that is moved for macro photography different from the optical system that moves during focusing and zooming, and also provides a macro operation member independently of the zooming operation member. The macro operation member is movably switched when the zooming lens moves to a preset focal length, which reduces erroneous operations and simplifies the macro photography mechanism. Can be provided.

[Example] An example will be described in detail below using FIGS. 1 to 5.

In the figure, reference numeral 1 denotes a fixed barrel, and the fixed barrel 1 has first, second, and third cam grooves 1a, 1b, and 1c, a straight groove 1d, and a screw portion 1e for attaching to the camera. Reference numeral 2 denotes an intermediate cylinder fitted on the outside of the fixed cylinder 1, and the intermediate cylinder 2 has a first operating member 4 for performing focus operation and zoom operation, and fine-pitch screws 2a, 4.
They are joined at a.

Reference numeral 6a denotes a female helicoid ring in which a first lens holding frame 6a' holding a first lens group _L1 that performs a focusing action and a correction action is bayonet-engaged, and is screwed into the intermediate cylinder 2 through a helicoid 3.

6b is a long groove on the outer periphery of the female helicoid ring 6a;
4b is a pin fixed to the operating member 4 that engages with the long groove. 8 is a scale ring attached to the fixed cylinder 1. 4
c and 2b are stoppers for the rotational direction of the operating member during focus operation. 2c is the long groove 1c of the fixed cylinder 1
A straight key that fits inside and is attached to the intermediate cylinder 2.

10 is the second lens holding the variator lens _L2 .
It is a lens holding frame and is fitted inside the fixed tube.

Reference numeral 12 denotes a rotating ring fitted inside a fixed cylinder in series with the second lens holding frame 10, and an arm 12a extends from the rotating ring 12 in a direction along the optical axis. It is inserted into a straight groove 10a provided in the second lens holding frame, and the arm portion 12a
, there is a longitudinal groove 10 formed in the second lens holding frame 10.
b and an engagement pin 1 which passes through the cam groove 1a formed in the fixed cylinder 1 and is further pressed by a coil spring 5 so as to engage with the tapered cam groove 2d of the intermediate cylinder 6.
2b.

10c is an engagement pin fixed to the second lens holding frame 10 and engaged with the cam groove 1b of the fixed cylinder 1 (the outer periphery thereof is fitted), and is fitted into the cam groove 1ab and the holding frame 10. The outer diameter portion of the holding frame 10 is eccentric, and by rotating the pin 10c, the eccentricity of the holding frame 10 can be adjusted. D is the third lens holding frame 1 that holds the relay lens group _L3 .
4 shows the aperture device attached.

15 is a fourth lens holding frame that holds the rearmost lens L3' in the relay lens group _L3 ;
It is rotatably and slidably fitted to the outer periphery of the lens holding frame 14, and is fixed to the step portion 15A with screws 17 to a macro operation member 16, which is a second operation member rotatably held in the fixed barrel 1. The third L-shaped lever 18 is inserted through the elongated hole 18a of the L-shaped lever 18 and provided in the fixed cylinder 1.
A pin 19 that engages with the cam groove 1c is implanted.

Reference numeral 20 denotes a switching button for macro photographing operation, which is held in a movable state by a coil spring 21 on the macro operation member 16.
a is engaged with a step groove 1f provided in the fixed cylinder 1, and movement of the macro operation member 16 in the rotational direction is restricted. Further, the arm 20b at the other end is formed into an L-shape so as to be fitted into an elongated hole 2e provided in the intermediate cylinder 2. Note that the step groove 1 of the fixed cylinder 1
A long groove 1f' extending circumferentially from f is provided.

Reference numeral 22 denotes a leaf spring fixed to the fixed barrel 1 with a screw 23. During normal shooting, the L-shaped arm 20b is locked so that the switching button 20 cannot be pressed.
It is configured to abut against the end surface 2f of the intermediate cylinder 2.

The operation of the lens barrel configured as described above and the operation of each part will be described.

When the operating member 4 is rotated around the optical axis, the female helicoid 6a is activated by the engagement between the pin 4b and the long groove 6b.
The first lens holding frame 6a' is extended by the helicoid 3 while rotating in the optical axis direction, and the first lens
A focus action is performed by L ₁ .

For zoom operation, move the operating member 4 in the optical axis direction arrow A.
When the intermediate cylinder 2 and the first lens holding frame 6a' move together, the intermediate cylinder 2 moves linearly in the rotation ring 12 due to the engagement relationship between the cam grooves 2d and 1a and the engagement pin 12b. is converted into rotational motion. The rotational movement of the rotating ring 12 is controlled by the pin 12.
b and the long groove 10b engage, the second lens holding frame 1
0 is rotated, and the movement of the compensator lens _L2 is controlled by the engagement relationship between the pin 10c and the cam groove 1b.

Therefore, during a zooming operation, the correction lens _L1 moves together with the operating member due to the linear movement of the operating member, and the variable power lens _L2 moves according to the lead of the cam groove 1b, and the first lens L1 and the first lens L2 move in accordance with the lead of the cam groove _1b . 2 lenses
The movement of _L2 and the distance between the two lenses perform a magnification change action and an aberration correction action.

Next, we will discuss the macro photography mechanism.

In Figure 4, the position of the intermediate cylinder 2 is in front of the wide end surface in the zooming operation state, and when it is further slid in the direction of arrow B and stopped at the wide end (the state shown in Figure 1). The leaf spring 22 is pressed by the end surface 2f of the intermediate cylinder 2, and the macro photography switching button 2 is pressed.
0 is released, the elongated hole 2e of the intermediate cylinder 2 aligns with the arm 20b, and the switching button 20 becomes ready to be pressed.

To perform macro photography, in the above state (wide end), push the switching button 20 against the coil spring 21 in a direction perpendicular to the optical axis, and the arm 20b of the switching button 20 will fit into the elongated hole of the intermediate tube 2. 2e to prevent the intermediate tube 2 from moving in the optical axis direction, and the other arm 20a of the switching button 20 is inserted into the fixed tube 1.
The macro operating member 16 is released from the stepped groove 1f, and the rotation restriction of the macro operating member 16 is released, so when the macro operating member 16 is rotated in the direction of arrow C in FIG. 5 while pressing the switching button 20, the button 20 is The arm 20a is the fixed tube 1
Rotates within the extended groove 1f' of the stepped groove 1f. The arm 20b of the other button rotates within the elongated hole 2e of the intermediate cylinder 2. In short, since the button 20 rotates while being pushed in, the intermediate tube 2 is prevented from moving in the optical axis direction during that time.

On the other hand, as the L-shaped lever 18 fixed to the macro operation member 16 rotates, the pin 19 fitted into the elongated hole 18a rotates and moves in the optical axis direction along the cam groove 1c of the fixed barrel 1. be done. Therefore,
The fourth lens holding the lens L3′ with the pin 19 implanted therein
The lens holding frame 15 is moved to the mount surface side, and macro photography becomes possible.

As explained above, zooming is performed by moving the first operating member in the optical axis direction, focusing of the normal shooting range is performed by rotating the first operating member, and macro Focusing for macro photography is performed by rotating the operating member, so fine adjustments in macro photography are easy.
Since both operating members are different, it is effective in preventing erroneous operations.

Furthermore, the second operating member is configured such that the macro photography switching button can be operated only when the first operating member is in a predetermined position.
This has the effect of preventing double operation errors.

[Effects of the Invention] The present invention sets the optical system to be moved for macro photography independently of the optical system to be moved for focusing and zooming, and also makes the macro operation member independent from the zooming operation member. This arrangement prevents erroneous operations and also simplifies the movement mechanism of the macro optical system. In addition, the macro operation member can be operated when the zooming optical system has moved to a preset focal length.
Even though the macro operation member is provided independently, it is possible to prevent unauthorized macro operations during normal shooting.

[Brief explanation of the drawing]

1 to 3 show a zoom lens barrel according to an embodiment of the present invention, and FIG. 1 is an axial cross-sectional view. Second
This figure is a diagram showing the relationship between each cam groove and the engagement pin in FIG. 1 when the lens is in a wide-angle position. Figure 3 is the second
The figure which shows the relationship between each cam groove and an engagement pin when the lens position of the figure is moved to a telephoto position. Figures 4 to 5
The figure shows the macro photographing mechanism portion of the present invention, and FIG. 4 is a diagram showing a state in which the intermediate cylinder (first operating member) is in a position immediately before the wide-angle end. FIG. 5 is a diagram showing the relationship between the macro operation member and the macro lens (L3'). DESCRIPTION OF SYMBOLS 1...Fixed barrel, 2...Intermediate barrel, 4...First operating member, 15...4th lens holding frame, 16...2nd operating member (macro operating member).

Claims (1)

[Scope of Claims] 1. A first optical system that moves during zooming, a second optical system that moves during focusing, a zooming operation member, and a first optical system that moves in conjunction with the movement of the zooming operation member. a zooming movement mechanism that moves the optical system in the optical axis direction; and a third optical system that is provided independently of the first optical system and the second optical system, that is fixed during zooming and focusing, and that moves during macro photography. a macro operating member provided independently of the zooming operating member; and a macro operating member that moves the third optical system in the optical axis direction in conjunction with movement of the macro operating member. a moving mechanism; a switching member that moves between a blocking state in which movement of the macro operating member is blocked and a blocking release state in which the blocking is released; and a switching member that moves when the first optical system moves to a preset focal length. , further comprising a restriction mechanism that allows the switching member to move from the blocking state to the blocking release state, and prohibiting movement of the switching member from the blocking state to the blocking release state outside the preset focal length. A lens barrel equipped with a macro photography mechanism. 2. The macro movement mechanism inserts a cam follower connected to a holding member that holds the third optical system into a macro cam groove, and moves the cam follower by moving the macro operation member. 2. A lens barrel equipped with a macro photographing mechanism according to claim 1, wherein the third optical system is moved in the optical axis direction. 3. The limiting mechanism moves a blocking member that blocks movement of the switching member to a blocking release position when the movable tube that moves in the optical axis direction by the zooming moving mechanism moves to the preset focal length position. Claim 1 or 2, characterized in that the switching member is moved from the blocking state to the blocking release state by being displaced.
A lens barrel equipped with the macro photography mechanism described in Section 1.