JPH0225815A - Collapsible barrel housing system interchangeable zoom lens-barrel - Google Patents

Abstract

PURPOSE:To improve a compact character at the time of non-using and a portability by extending the cam groove of an inverted cam in a direction to conduct a first lens at a lens mounting side in operating a zooming operating member further in addition to a length necessary for a zooming action. CONSTITUTION:When a zoom ring 9 is rotated from a telephoto position and a character 9c is aligned to an index line 6d, a pin 8 is further moved along a linear part 4c of a cam groove 4e of a cam ring 4, and it comes to a housing position. By the rotation of the zoom ring 9, a pin 5 is also moved further along a curve 2c of a cam grove 2e of one group moving frame 2, and it comes to the housing position. Consequently, the one group moving frame 2 is moved at an optical axis direction camera side along with an L1 lens holding barrel 1 and a lens L1. Since the curve 2c is comparatively drastically curve din the optical axis direction, by the slight rotation of the zoom ring 9, the large optical axis direction movement of the L1 lens holding barrel 1 can be obtained, and a zoom lens lens-barrel can be located in a sinking barrel housing position. Thus, the optical axis direction overall length at the time of non-using can be shortened.

Description

[Detailed description of the invention] Industrial application gI? ] The present invention relates to a collapsible interchangeable zoom lens barrel that is collapsible when not in use, thereby shortening the blond hair and improving portability.

[Prior Art] A zoom lens barrel of a conventional camera has many (for example, four
Because the lens group (4111C) is included, the total length becomes ν, and the weight becomes heavier, which makes operability a big problem. In recent years, zoom lens barrels with only two lens groups have been developed, contributing to shorter overall length and lower weight. The zoom lens cry tube is
According to the zooming operation, the front and rear lens groups are moved while maintaining a distance according to a predetermined function.

This provides a zoom effect.

[Problems to be Solved] Although a zoom lens barrel having two lens groups has been developed, the market is demanding a zoom lens barrel that is even easier to use. In particular, zoom lens barrels are required to be compact and portable when not in use.

SUMMARY OF THE INVENTION An object of the present invention is to provide a zoom lens barrel that is compact and portable when not in use.

[Means for Solving WII181] The collapsible and retractable interchangeable zoom lens barrel according to the invention includes a first lens, a second lens, and a zooming operation member that allows the first and second lenses to be arranged in a predetermined relationship in the optical axis direction. In a zoom lens barrel, the first drive unit is connected to a drive unit that moves in one rotation direction and to the first lens. ) The driving part has a cam groove that moves while in contact with it, and a driven part that is movable in the optical axis direction but not in the rotational direction, and the cam groove of the driven part is used for zooming operation. Add λ to the length required for
Furthermore, the first lens is extended in a direction such that when the zooming operation member is operated, the first lens is guided toward the lens mount side.

[Function] The collapsible and retractable interchangeable zoom lens barrel according to the present invention guides the drive unit to the extended cam groove by operating the zooming operation member outside the range of zooming operation,
Move the first lens toward the lens 7 mount side in the optical axis direction,
It is now possible to shorten the total length in the optical axis direction.

[Examples] Examples of the present invention will be described in detail in the following two drawings.

FIG. 1 is a cross-sectional view along the optical axis of a collapsible, retractable, interchangeable zoom lens barrel according to the present invention, showing the state when the lens is at the wide-angle position. At the first f7, the fixed cylinder 6
is a cylindrical small diameter cylinder part 6g and a cylindrical large diameter cylinder 1'11
It has a shape in which it is coaxially surrounded by 6h and its one ends are connected to each other. [/J The fixed tube 6 is designed so that one end (the right end in FIG. 5) can be attached to a camera (not shown).

At the center of the large-diameter cylindrical portion 6h of the fixed tube 6, an annular collar portion 6b is provided on the inner periphery.

The cylindrical .7 manual focusing ring 3 provided inside the large diameter cylinder 6h has a segment gear 3c formed only on a part of the circumference at the end on the camera side.
Further, a circumferential groove 3b is provided on the outer periphery near the end. The manual focusing ring 3 has a flange portion 6b in a circumferential groove 3b.
is engaged with the large diameter cylindrical part 6h, and the fixed cylinder 6
Although it can move freely in the rotational direction, it cannot move in the optical axis direction.

A straight groove 3a extending in the optical axis direction is provided on the inner wall of the end of the manual focusing ring 3 on the subject side. #1 The cylindrical Ll lens holding tube l is provided with a protrusion ib on the outer periphery of the end on the camera side, and the protrusion ib is inserted into the straight groove 3a.
It is screwed into the first group moving frame 2 by engaging with the manual focusing ring 3, and can be moved in the optical axis direction with respect to the manual focusing ring 3.
It is designed not to move in the direction of rotation. Keep Ll lens? The lens Ll is coaxially and integrally attached to the lens Ll. Therefore, the lens L1 moves in the optical axis direction as the Ll lens holding cylinder moves in the optical axis direction.

The LX lens holding cylinder l has a female edge screw la carved into the inner wall of the end on the camera side.The cylindrical IJ'F moving frame 2 has a male edge screw 2a carved into the outer wall of the end on the subject side. By screwing together the female edge screw la and the male edge screw 2a, the Ll lens holding tube 1
It is installed internally.

The manual focusing ring 3 can be rotated by external rotational force transmitted through a binion gear (not shown) meshing with the segment gear 3c, and can also be rotated manually. , the Ll lens holding tube l rotates, and due to the action of the helicoidal screws la and 2a, the Ll lens holding tube moves in the optical axis direction, moving the lens Ll in the optical axis direction and focusing on the focal point 51. It is possible to perform the verses.

The first group moving frame 2 has a cam 192 which is a driven part in the circumferential direction.
e is provided so that the inner and outer walls communicate with each other. Cam 112e
The shape will be explained later with reference to FIG. 6A.

A pin 5, which is a driving part, is engaged in the cam groove 2e.
The bottle 5 passes through an escape hole 6a provided in a small diameter cylindrical portion 6g of the fixed portion 6, and is implanted on the outer periphery of the cylindrical cam ring 4. The shape of the relief six 6a will be explained in detail later with reference to No. 61J.

A circumferential groove 6C is provided in the center f'16 of the small diameter cylindrical portion 6g over a predetermined angle in the circumferential direction, and a convex portion 4a is provided on the outer periphery of the center portion of the cam ring 4. Cam ring 4
is internally attached to the small diameter cylindrical portion 6g by engaging the convex portion 4a with the circumferential groove 6c, and is movable in two rotational directions relative to the fixed portion 6, but not in the optical axis direction. There is. A cam 11114e is provided from near the end on the camera side to the center of the cam ring 4 so as to communicate with the inner and outer walls. The shape of the cam groove 4e will be described in detail later with reference to FIG. 6B. A bin 8 is engaged in the cam 14e, and the bin 8 is a substantially cylindrical second group lens holding cylinder 7.
are planted around the periphery of the The lens L2 is coaxially and integrally attached to the center of the T52 group lens holding cylinder 7. In addition, cam ring 4. The bin 8 and the second group lens holding cylinder 7 constitute a second drive stage f.

The head of the bottle 8 passes through the cam groove 4e of the second cam ring 4 and engages with an optical axis direction groove 6j (see FIG. 6B) provided in the inner wall of the small diameter cylindrical portion 6g of the fixed cylinder 6. The optical axis direction *6j, only partially shown in FIG. 1, extends in the optical axis direction from the end on the camera side to the center, but the circumferential groove 6c
It is located at a position on the circumference that does not interfere with the

There is a rectangular notch 4 in the end of the cam ring 4 on the camera side.
d is provided, and is engaged with the rear end 10a of the cam lever IO. The cam lever lO has a tip 10b attached to the rear end of the zoom ring 9, which will be described later, with a small screw 12, and is further attached to a large diameter relief provided at the camera side end of the large diameter cylindrical portion 6h of the fixed barrel 6. The notch 4d of the cam ring 4 is reached by passing through the hole 6e and a small diameter escape hole 6f provided at the end of the small diameter cylinder H66g of the fixed barrel 6 on the camera side. The end circumferential groove 6f is also formed in a part of the circumference, that is, over a predetermined angle, similarly to the above-mentioned circumferential groove 6C.

An index line ad (
(see Figure 4) is engraved. A cylindrical zoom ring 9 is rotatably provided on the large diameter cylindrical portion 6h adjacent to the outermost circumferential surface. There is a fourth ring on the outer peripheral surface of the zoom ring 9.
As shown in the figure, characters 9e (CLOSE) indicating the focal point @9b and the collapsible storage position are stamped. - It is clear from the above configuration that the zoom ring 9 is connected to the cam lever l.
The small diameter cylindrical portion 6g and the large diameter cylindrical portion 6 of the fixed cylinder 6 rotate integrally with the cam ring 4 via O.
h is designed so as not to impede its rotation.

An aperture ring 11 is provided at the camera-side end of the large-diameter portion m 6h of the fixed barrel 6. Since this ring is not part of the present invention, its explanation will be omitted.

FIG. 2 is a sectional view in the optical axis direction of the collapsible interchangeable zoom lens barrel according to the present invention when it is in the telephoto position.

FIG. 3 is a cross section 1g in the optical axis direction when the collapsible interchangeable zoom lens barrel according to the present invention is in the collapsible storage position.

FIG. 4 shows an enlarged view of the zoom ring 9 and the fixed barrel 6 in the collapsible interchangeable zoom lens barrel according to the present invention, and shows the position of the index line 6d and the focal length memory 9b at the telephoto position shown in FIG. It is a diagram showing the rA section.

Fig. 5 shows an enlarged view of the zoom ring 9 and fixed barrel 6 of the collapsible interchangeable zoom lens barrel with a 1 tl design, and shows the index line 6d and focal length indicator when the barrel is in the collapsible storage position shown in Fig. 3. Fig. 1 is a diagram showing the positional relationship with 9b.

FIG. 6A shows the situation of the first group moving frame 2 and the cam %q2e
FIG. 2 is an enlarged view showing the bins 5 and 5 which can take various positions within the cam 1lZe. Except as shown in No. 6AI'A, the cam groove 2e on the first group moving frame 2 is on the soi 1- side (position).
When moving from the telephoto side to the play side (position 1), the cam 1A2e is drawn relatively in the opposite direction to the curve 2b when moving from the telephoto side to the stowed position. In 6AI'A, the escape hole 6a provided in the small diameter cylindrical portion 6g of the fixed cylinder 6 is shown by a broken line 4. In FIG. In fact, the bottle 5 is shown to be protruding from the escape hole 6a, but does not protrude from the escape hole 6a since the movement of the bottle 5 is restricted only within the escape hole 6a, and instead, the bottle 5 or the escape hole 6 a N,': along-
), the first group moving frame 2 moves in the optical axis direction. Note that the length LT (not shown in Figure 6A) indicates the amount of movement of the 1m moving frame 2 from the wide position to the tele position (see Figure 2); In this embodiment, the cam groove 2e is formed so that LT>LC, which indicates the amount of movement to the stowed position (see Fig. 3). , it is possible to obtain a zoom lens barrel that is shorter in full length when stored.

No. 6B14 expands the circumferential surface of the cam ring 4 to form a cam groove 4e.
is an enlarged view showing the inside of the cam n4e 1... together with the bin 8 which can take various positions. As shown in No. 681-, in the cam ring 4, the cam groove 4@ has a diagonal portion 4b that is diagonal from the wide side toward the telephoto side, and a straight portion 4b that is diagonal in the circumferential direction from the telephoto side toward the storage position. It consists of a straight section 4C provided with a straight line.

In FIG. 6B, the optical axis direction groove 6j provided in the small-diameter cylindrical portion 6g of the fixed barrel 6 is one series of 61 indicated by a broken line.Similar to FIG. Since the movement of the bottle 8 is restricted only within the optical axis direction groove 6j, the bottle 8 moves 1jJf along the optical axis direction groove 6j every time the cam ring 4 rotates.

FIG. 7 shows the position lSlJgt when the cam grooves 2e, 4e and the pin 5.8 shown in Bag 6A are on the telephoto side.
FIG.

The fBB diagram is a diagram showing the positional relationship between the cam grooves 2e and 4e and the bottle 5.8 shown in FIGS. 6A and 8 when they are in the storage position.

In FIG. 7.8, for convenience, the cam grooves 2e4e may both be depicted in the same drawing, or they may be provided in separate members as described in FIGS. 6A and 6B1.

Next, the operation of the collapsible interchangeable zoom lens barrel according to the present invention will be explained with reference to FIGS. 1 to 8.

As mentioned above, Figure 1 shows the zoom lens barrel in the wide position. become.

To set the zoom lens barrel in this state to the tele position, that is, to perform a zooming operation, the zoom ring 9 should be rotated once in the direction of the arrow in Fig. 4.The cam lever lO attached to the zoom ring 9 It rotates together with the rotation of the ring 9, and the cam ring 4 is rotated in the direction of the arrow in FIG. However, since the movement of the bottle 8 is restricted only within the optical axis direction groove 6j of the small diameter cylindrical portion 6g of the fixed barrel 6,
It moves only in the optical axis direction (in this case, toward the subject).

Since the bottle 8 is attached to the second group lens holding tube 7, as the bottle 8 moves, the second group lens holding tube 7 moves in the optical axis direction, and the 1.' lens L2 also moves. The tele position shown in FIG. 2 will be obtained.

Furthermore, the rotation of the cam ring 4 moves the bin 5 four wheels, and the bin 5 moves along the curve 2b of the cam groove 2e of the first group moving frame 2. however.

Since the movement of the bottle 5 is restricted only to the circumference WII6a of the small diameter cylindrical portion 6g, the 1st group movement @1l=2 moves in the optical axis direction according to the shape of the cam groove 2e to move the Ll lens holding cylinder l and the lens 1. , l, thereby obtaining the tele position shown in FIG. Next, the operation of collapsing and storing the zoom lens barrel will be explained. From the above-mentioned telephoto position, rotate the zoom ring 9 in the direction of the arrow in FIG.

When the character 9e (CLO3E) is aligned with the index 116d, the bottle 8 moves further along the straight portion 4C of the cam 114e of the cam ring 4 and comes to the position shown in FIG. 8 (storage position). In this case, since the bin 8 does not move in the optical axis direction, the second group lens holding cylinder 7 is not moved. Therefore, the lens 1.2 remains at the telephoto position d.

As the zoom ring 9 rotates, the bin 561 group moves further along the curve 2c of the cam groove 2e of the moving frame 2, and as shown in FIG.
Come to the position shown. Therefore, the first group moving frame 2 moves toward the camera in the optical axis direction together with the LX lens holding mi and the lens L1. Since the curve 2c is curved relatively sharply in the optical axis direction, a slight rotation of the zoom ring 9 allows one large movement of the L1 lens holding barrel l in the optical axis direction. In this manner, the collapsible and retractable interchangeable zoom lens barrel according to the present invention can take the collapsible and retractable position as shown in FIGS.

Note that in order to return from the collapsible storage position to the normal photographing position, the zoom ring 9 may be rotated in the direction opposite to the arrow in FIG. 4. In addition, when the barrel is retracted, it is natural that one stitch is optically impossible to shoot, but by transmitting a signal to the camera body that the barrel is in the retracted position, it is possible to turn off the camera release, link, or one source of the camera. By doing this, you can avoid taking silly pictures. The autofocus interchangeable lens barrel originally has a zoom encoder (m7I) built in, so I extended the zoom encoder's turn to the tele or wide side.

If a signal is provided to indicate that the barrel is in the collapsible storage position,
Structurally, it can be changed very easily.

The embodiments of the collapsible, retractable, interchangeable zoom lens barrel according to the present invention have been described above with reference to the drawings, but the present invention should not be construed as being limited to the above embodiments, and within the range that does not impair its reconstruction. Of course, changes and improvements can be made as appropriate. For example, in this embodiment, when going from the telephoto position to the collapsible storage position, the bin 8 does not move the second group lens holding cylinder 7 and the lens L2 maintains the telephoto position, or the cam ring 4 Straight line portion 4 of cam 144e
By orienting C toward the end on the camera side, a configuration is obtained in which the bin 8 or the S2 group lens holding cylinder 7 is collapsed toward the camera side when going from the telephoto position to the collapsible storage position.
Thereby, the collapsing operation of the first group moving frame 2 can be prevented from being obstructed. Further, in this embodiment, the cam groove 2e extends from the Te 1/ side, but it can also extend from the wide side.

[Effects of the Invention] According to the collapsible interchangeable zoom lens barrel according to the present invention described in detail above, the following effects can be obtained.

The first driving means has a driving part that moves in the rotational direction, and a cam groove that is connected to the first lens and moves while the driving part is in contact with the first lens, and is movable in the optical axis direction but not in the rotational direction. It consists of a driven part that does not move, and by adding the cam groove of the driven part to the length necessary for the zooming operation, and further operating the zooming operation member, the first lens can be moved to the lens '7 mount side. guiding the driving portion to the extended cam groove by operating the zooming movement member out of the range of the zooming movement;
By moving the first lens to the lens mount l-polarization in the optical axis direction, it is possible to shorten the length of the hair in the optical axis direction.

[Brief explanation of the drawing]

FIG. 1 is a sectional view along the optical axis of a retractable interchangeable zoom lens barrel according to the present invention, showing the state when the lens is in the wide position. FIG. 2 is a sectional view in the optical axis direction of the collapsible interchangeable zoom lens barrel according to the present invention when it is in the telephoto position. FIG. 3 is a cross-sectional view along the optical axis when the collapsible interchangeable zoom lens barrel according to the present invention is in the collapsible storage position. FIG. 4 shows an enlarged view of the zoom ring 9 and the fixed barrel 6 in the retractable interchangeable lens barrel according to the present invention.
3 is a diagram showing the positional relationship between the finger 41 line 6d and the focal length scale 9b at the telephoto position shown in FIG. 2. FIG. FIG. 5 shows an enlarged view of the zoom ring 9 and fixed barrel 6 in the collapsible interchangeable zoom lens barrel according to the present invention, and shows the finger lll5sl1 when the lens barrel is in the collapsible storage position shown in FIG.
6d is a diagram showing the positional relationship between the focal length d9b and the focal length d9b. FIG. 6A shows a bottle 5 that can take various positions t in the cam groove ze by expanding the circumferential surface of the 1 m # effect frame 2 and enlarging the cam groove 2e.
FIG. FIG. 6B is an enlarged view of the cam ring 4 with the circumferential surface of the cam ring 4 unfolded and the cam 4e shown at 1 with the pin 8 which can take various positions within the cam 4e. FIG. 7 is a diagram showing the positional relationship between the cam grooves 2e and 4e and the pins 5 and '8 shown in FIGS. 6A and 6B when they are on the telephoto side. FIG. 8 is a diagram showing the positional relationship between the cam grooves 2e and 4a and the bin 5.8 shown in FIGS. 6A and 6B when they are in the storage position. [Explanation of symbols of main parts] Ll lens holding cylinder 2.
・・・・・・・・・・・・1 group moving frame 3・・・・・・
......Manual focusing ring 4...Cam ring 5.8...
......Bin 6...Fixed barrel 7...
......Second m lens holding cylinder 9...
...Zoom ring L1. L2...Lens

Claims (1)

[Scope of Claims] First and second lenses, and first and second driving means for performing a zooming operation by moving the first and second lenses in a predetermined relationship in the optical axis direction using a zooming operation member. In the zoom lens barrel, the first driving means has a driving part that moves in the rotational direction, and a cam groove that is connected to the first lens and that the driving part moves while being in contact with the first lens. It consists of a driven part that is movable in the direction of the optical axis but not in the rotational direction.The cam groove of the driven part has a length necessary for zooming, and furthermore, by operating the zooming operation member, extending the first lens in a direction that leads it to the lens mount side, and guiding the drive unit to the extended cam groove by operating the zooming operation member out of the zooming range;
Move the first lens toward the lens mount in the optical axis direction,
A retractable interchangeable zoom lens barrel characterized by its ability to shorten the overall length in the optical axis direction.