JPS5932972Y2 - Camera interchangeable lens distance adjustment device - Google Patents

Description

[Detailed description of the invention] This invention relates to a distance adjustment device that enables macro focusing from the longest focal length position of the lens, which is called the telephoto end, in interchangeable lenses for cameras. distance (e.g. 85
mm) position, move the entire lens group toward the subject,
It is possible to increase the magnification at the telephoto end (for example, the above lens achieves the same effect as a lens with a focal length of 100 mm), and uses a zoom lens with a relatively short focal range to improve the telephoto effect and make the device smaller. It is to make it.

To explain the embodiment with reference to the drawings, in FIG. 1, Ll is the 1171st lens group, L2 is the second lens group, and L3 is the 1171st lens group.
is the third lens group and L4 is the fourth lens group, and when the lens L1 is moved relative to the second lens group L2, the third lens group L3, and the fourth lens group L4, focusing is performed, Further, zooming is performed when the lens group L1, the third lens group L3, and the fourth lens group L4 are moved relative to the second lens group.

The first lens group L1 is integrated into the inner ring 1b at the front end of the operating ring 1, and a male helicoid 2 is carved on the outer periphery of the inner ring 1b. The female helicoid 3 of the enlarged movable cylinder 4 is screwed together.

An annular protrusion 5 is provided at a position closer to the front of the inner surface of the outer ring 1a of the operation ring 1, and this protrusion 5 is cut out by a scale range from infinity to short distance. By reciprocating the operating ring 1 in a clockwise or counterclockwise direction so that the pin 6 comes into contact with both notched end surfaces of the protrusion 5, the operating ring 1 The lens group L1 integrated with the lens moves in the optical axis direction by the engagement of the helicoids 2 and 3, and focusing is performed from infinity to a short distance.

The second lens group L2, the third lens group L3, and the fourth lens group L4 are a holding frame 7 that is slidably fitted into the movable tube 4.
, 8.9, respectively, and each holding frame 7, 8.9.
As shown in FIG. 2, the reference numeral 9 consists of a cylindrical portion and a plurality of legs, and these legs are assembled with their positions shifted from each other.On each leg, there are pins 7a, 8a,
9 a.

The movable tube 4 has three elongated holes 10, 11, 12 parallel to the optical axis at required intervals in the circumferential direction and the front-rear direction so that the pins 7a, 8a, and 9a pass through them. A pin 4a is also installed at the rear.

On the outer periphery of the movable barrel 4, a fixed lens barrel 13 is provided with a mounting portion 13b for attaching to the camera body at the rear end and whose front half is formed into a double barrel.
is fitted, and the inner tube 13a has a long elongated hole 14 parallel to the optical axis for guiding the pin 4a on the movable tube 4 at a required interval in the circumferential direction, and a long hole 14 parallel to the optical axis for guiding the pin 4a on the movable tube 4. Elongated holes 15, 16.17 and a pin 18 are provided which are shorter and shifted to the front than the three elongated holes 10, 11.12 provided above and parallel to the optical axis.

Further, a cam barrel 1 is provided on the outer periphery of the inner barrel 13a of the fixed lens barrel 13.
9 is slidably and rotatably fitted, and this cam cylinder 1
9 has a rotating cam groove 20 inclined to the optical axis at a required interval in the circumferential direction and the front-rear direction, a horizontal cam groove 21 perpendicular to the optical axis, and a third cam groove 21 which is perpendicular to the optical axis. Fourth lens group L3. Arc-shaped cam groove 22, 23 for L4 movement and part 2 perpendicular to the optical axis
4 a and the part 24b parallel to the optical axis backward from the right end
A hook-shaped cam groove 24 (see FIG. 3) is provided, and as shown in FIG. The upper pin 4a is inserted, and the horizontal cam groove 21 is inserted into the inner cylinder 13.
a and the front elongated holes 15 and 10 of the movable tube 4, and the pin 7a of the lens holding frame 7 is fitted into the intersection. It intersects with the elongated holes 16 and 11, and the pin 8a of the lens holding frame 8 is fitted into the intersection thereof, and the other arcuate cam groove 23 intersects with the elongated holes 17 and 12 at the rear of the inner cylinder 13a and the movable cylinder 4. A pin 9a of the lens holding frame 9 is fitted into the intersection, and a pin 18 on the inner cylinder 13a is fitted into the hook-shaped cam groove 24.

Note that a well-known aperture opening/closing mechanism is incorporated in the holding frame 8 of the third lens group L3.

In FIG. 3, the third and fourth lens groups L3. Inner barrel 1 of movable barrel 4 and fixed barrel 13 when L4 is set at short focal length position
3a, the elongated hole of the cam cylinder 19, and the cam groove are expanded and shown. Third. Fourth lens group L2. L3. L4 holding frame 7, 8
．． The pins 7a, 8a, 9a on the movable cylinder 4 are connected to the elongated holes 10,
11.12 and the rear end of the elongated holes 15, 16.17 in the inner tube 13a of the fixed lens barrel 13, and are located at the rear end thereof. 22. The pin 4a on the movable cylinder 4 is located at the left end of the inner cylinder 13a.
The pin 18 on the inner cylinder 13a is located at the left end of the hook-shaped cam groove 24 of the cam cylinder 19.

In this state, if the operating ring 1 is moved in the direction of arrow A, that is, forward, the first lens group L1, which is integrated with the operating ring 1, will move forward, and the movable cylinder 4, which is screwed into the operating ring 1 by the helicoid 2°3, will move forward. The pin 4a moves forward while being guided by a long slot 14 provided in the inner tube 13a of the fixed lens barrel 13.

At this time, since the pin 4a on the movable cylinder 4 is also engaged with the inclined cam groove 20 of the cam cylinder 19, the cam cylinder 19 tries to move forward while rotating, but the fixed inner cylinder 13a
Since the upper pin 18 engages with the optical axis perpendicular portion 24a of the hook-shaped cam groove 24 of the cam barrel 19, the cam barrel 19 cannot move forward but rotates only in the direction of arrow B in FIG.

The holding frame 7 in which the pin 7a is engaged with the horizontal cam groove 21 of the cam cylinder 19 is not affected at all, and therefore the second lens group L2 does not move in the optical axis direction.

On the other hand, the holding frames 8 and 9, in which the pins 8a and 9a are engaged with the two arcuate cam grooves 22 and 23 of the cam cylinder 19, move under the influence of the holding frames 8 and 9, and the second lens group L3 and the fourth lens The group L4 moves in the optical axis direction as shown in FIG. 4, and is set to a long focal point state.

In the state shown in Fig. 4, if you push the operation ring 1 further, the inner cylinder 1
Since the pin 18 on 3a extends into the optical axis parallel part 24b of the hook-shaped cam groove 24 of the cam barrel 19, the movement of the cam barrel 19 in the optical axis direction is released, and as described above, The cam cylinder 19 is moved integrally with the pin 4a of the movable cylinder 4 in the optical axis direction by the pin 4a of the movable cylinder 4 which moves together with the operation ring 1.

Therefore, the second lens group L1 is of course included in the second lens group L2 in the holding frame 7, which is provided with the pin 7a that engages with the horizontal cam groove 21 of the cam cylinder 19, and the third lens group L2 held in the other holding frames 8 and 9.
．． Fourth lens group L3. All the lens groups of L4 move forward to the state shown in FIG. 5 while maintaining their mutual relative positions, and are set at the long focal point, macro position.

Then, if you pull back the operating ring 1 in the state shown in Fig. 5,
All the lens groups go through the state shown in FIG. 4 and return to the short focus state shown in FIG. 3.

On the other hand, in any of the states shown in FIGS. 3 to 5, the pin 4a on the movable barrel 4
3a, the movable tube 4 does not rotate even when the operating ring 1 is rotated, and only the operating ring 1 is engaged with the male and female helicoids 2°3. Rotated by relationship,
Only the second lens group L1 is the other lens group L2. L3. Normal distance adjustment is performed by moving forward and backward relative to L4.

As described above, in this invention, the back and forth movement of the operating ring is transmitted to the cam barrel via the movable barrel that is screwed into the operating ring, and the cam barrel is rotated to change the relative spacing between each lens group, thereby performing zooming. When the operation ring is moved forward in the long focus setting state of zooming, the cam barrel also moves forward via the moving barrel, so that all lens groups move together in the optical axis direction, and the long focus state, that is, the telephoto Since "macro focusing" can be performed on the end side, the magnification can be further increased in the long focal state in a zoom lens system with a predetermined focal length, and the telephoto effect can be fully demonstrated, making it possible to use interchangeable lenses. This is useful for downsizing, compactness, and weight reduction.

[Brief explanation of drawings]

Fig. 1 is a half-sectional side view of an embodiment of this invention, Fig. 2 is an exploded perspective view of some of the constituent parts, Fig. 3 is a partially exploded view of the cam barrel, etc. when the short focus is set, Fig. 4 5 is a similar developed view when the long focus is set, and FIG. 5 is a similar developed view when the macro focusing is set. In the figure, 1...operating ring, 1b...inner ring, 2...male helicoid, 3...female helicoid, 4... ...Movable tube, 5...Protrusion,
6...pin, 7,8.9...holding frame,
7a, 8a, 9a...Pin, 10, 11.12
...Long hole, 13...Fixed lens barrel, 13a
...Inner tube, 14, 15, 16.17...
...Elongated hole, 18...Pin, 19...Cam tube, 20...Slanted cam groove, 21...
・Horizontal cam groove, 22.23...Arc-shaped cam groove,
24...Hook-shaped cam groove.

Claims (1)

[Scope of utility model registration request] The movable barrel 4 is screwed into the inner barrel 1b of the operating ring 1 that holds the lens group L1, and is also slidably fitted into the inner barrel 13a of the fixed lens barrel 13, and the outer periphery of the inner barrel 13H. are provided with inclined cam grooves 20 at required intervals in the circumferential direction and longitudinal direction, and horizontal cam grooves 21 perpendicular to the optical axis. A cam barrel 19 having two arcuate cam grooves 22, 23 and a hook-shaped cam groove 24 is fitted in a rotatable and sliding manner, and a holder for holding the second lens group L2 is provided at the inner front end of the movable barrel 4. While fitting the frame 7, a third frame 7 is fitted behind it. Fourth lens group L3. The holding frames 8 and 9 that hold L4 are inserted so as to move back and forth, and the pin 7a on the holding frame 7 is inserted into the moving cylinder 4.
The pins 8a and 9a on the holding frames 8 and 9 are inserted into the movable barrel 4 and the pins 8a and 9a on the holding frames 8 and 9. The long holes 11.12 and 16. of the inner cylinder 13a.
17 to penetrate the arcuate cam grooves 22, 23 of the cam cylinder 19.
The pins 4a on the movable cylinder 4 are engaged with the elongated holes 14 of the inner cylinder 13a, and the inner cylinder 1
A distance adjusting device for an interchangeable lens for a camera, in which pins 18 on 3a are respectively engaged with hook-shaped cam grooves 24 of a cam tube 19.