JPH0428089B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a photographing lens barrel, more specifically, when attaching the photographing lens barrel to a camera body.
The present invention relates to a photographic lens barrel in which lens operating members such as a distance ring, an aperture ring, and a zoom ring provided on a circular lens barrel are rendered unrotatable to facilitate mounting operations.

As is well known, a photographic lens barrel that is detachably attached to a camera body is rotatably provided with lens operation members such as a distance ring, an aperture ring, and a zoom ring on its outer periphery. By rotating the lens operating member, the lens and diaphragm disposed within the lens barrel are moved, allowing distance adjustment, diaphragm adjustment, zoom adjustment, etc.

By the way, when attaching such a photographic lens barrel to the camera body, it is necessary to align the lens mount member with the body mount member, rotate the entire lens barrel, and attach it to the camera body. It's getting old. However, in order to rotate the lens barrel, elastic means such as springs are used to properly press the lens side mount member against the body side mount member, so a large force is required, and this force is In the past, there has been a problem that when the operating member is touched, only the lens operating member rotates and the lens barrel does not rotate, making it very difficult to attach the lens barrel. Particularly, when the lens barrel has a short overall length, the user has no choice but to grasp the lens operating member or place his or her fingers on the lens operating member, making the above-mentioned problem more pronounced.

An object of the present invention is to solve the above-mentioned conventional problems by attaching lens operating members such as a distance ring, an aperture ring, and a zoom ring to a photographing lens barrel when the photographing lens barrel is attached to a camera body. To provide a photographing lens barrel which is prevented from rotating.

According to the present invention, when the photographic lens barrel is attached to the camera body, the lens operating member cannot rotate with respect to the lens barrel, so it is difficult to place your finger on the lens operating member that occupies most of the outer circumference of the lens barrel. The lens barrel can be rotated. Therefore, the operation of attaching the photographic lens barrel to the camera body can be performed extremely easily. Particularly, in the case of a photographic lens barrel having a short overall length, the lens operating member occupies most of the outer circumference, so the effects of the present invention are remarkable. In addition, the surface of the lens operation member is
Since it is anti-slip with knurling or the like, the photographing lens barrel can be operated more easily.

Hereinafter, the present invention will be explained based on illustrated embodiments.

FIG. 1 shows a photographic lens barrel showing one embodiment of the present invention. This photographic lens barrel includes a photographic lens 1, a lens support tube 2 that holds the photographic lens 1, a helicoid male thread 3b carved on the rear outer peripheral surface of the lens support tube 2, and a helicoid male thread 3b carved in the center of the inner peripheral surface. The distance ring 3 is helicoidally connected to the lens support tube 2 by screwing together the provided helicoid female thread 3a, and the helicoid male thread 2a carved on the outer periphery of the rear end of this distance ring 3 is attached to the front inner peripheral surface. The distance ring 3 is screwed together with the engraved helicoid female thread 4a.
A fixed cylinder 4 that helicoidally connects the fixed cylinder 4 and
Lens side mount member 5 fixed to the rear end
and a fixing key member 6 that passes through the fixing barrel 4 and the mount member 5 and is disposed such that its tip protrudes toward the rear end of the outer peripheral surface of the lens barrel.
The key member 6 is rotatably arranged so that a pushed portion 7a provided at one end thereof can engage with a pushing piece 6a provided at the base end of the key member 6. A continuous ring is provided on the inner edge of the rear end of the distance ring 3 over the entire circumference so as to be able to engage with the locking member 7 and the chevron-shaped locking portion 7b provided at the other end of the locking member 7. The main part thereof is constituted by a valley-shaped locked portion 3c carved in a square shape.

As shown in FIG. 3, the key member 6 is formed of a rectangular plate vertically arranged perpendicular to the optical axis direction, and has a protruding piece extending from the center of its lower end. is bent horizontally toward the rear of the lens barrel to form the pushing piece 6a.
Also, the right edge of the key member 6 (in FIG. 3)
There is a notch in the center, and one end of the reciprocating spring 8 is fitted into this notch 6b. This reciprocating spring 8 is formed as a torsion spring having a leg-closing habit, and its other end is locked to an immovable stopper pin 9, and the reciprocating spring 8 has a habit of protruding outward from the lens barrel into the key member 6. giving. The movement of the key member 6 due to this habit is normally regulated by the pushing piece 6a coming into contact with the upper end surface of the connecting hole 5a of the lens mount member 5 (see FIG. 1). In this restricted state, the tip of the pushing piece 6a is
It is adapted to protrude above the rear outer peripheral surface of the mount member 5.

The locking member 7 is formed of a horizontally elongated lever arranged along the optical axis direction, and is attached to the fixed cylinder 4.
It is pivotally connected to a support shaft 12 that is implanted in an integral fixed plate 11. This locking member 7
, a double-acting spring 13 is wound around the support shaft 12 and has one end locked to the locking piece 11a of the fixed plate 11.
The other end is hung, and the elasticity of this reciprocating spring 13, which has the habit of opening legs, supports the habit of rotating counterclockwise around the support shaft 12. The rotation of the locking member 7 due to this habit is such that in normal life, the pushed portion 7a of the member 7 is rotated by the pushing piece 6a of the key member 6.
It is regulated by contacting the

The lens support tube 2 moves forward and backward in the optical axis direction but cannot rotate in the circumferential direction, and when the distance ring 3 is rotated, it is moved by the action of the helicoid male screw 2a and female screw 3a. The lens is moved back and forth in the direction of the optical axis to adjust the distance. Furthermore, several partially arcuate bayonet claws 5b are protruded from the outer peripheral edge of the rear end of the lens mount member 5 (see FIGS. 4A to 4C). Furthermore, a rubber ring 14 for operation is fitted into the center of the outer peripheral surface of the distance ring 3.

As described above, the photographing lens barrel of this embodiment is constructed.

Next, the function of this photographic lens barrel will be explained.

Before the photographic lens barrel is attached to the camera body, as shown in FIG. 4A, the key member 6 is moved to a position where the tip thereof protrudes the most from the lens barrel due to the elasticity of the spring 8 (see FIG. 3). The pushing piece 6a is brought into contact with the upper end surface of the connecting hole 5a of the mount member 5 and stopped. From this state, move the lens mount member 5 to the camera body body mount member 15.
(See Fig. 2) and push the lens barrel toward the camera body, the bayonet claw 5b engages the lens side mount member 5 and the bayonet notch 15a of the body side mount member 15 (see Fig. 4B). ，
(see C). Next, when the lens barrel is rotated relative to the camera body, the bayonet claw 5
b rotates while being pressed against the inner end surface of the mount member 15 by the leaf spring member 16 (see Fig. 2) provided on the mount member 15 next to the body, and as shown in Fig. 4B, the bayonet Notch 1
The pushing piece 6a is pushed down by the cam slope 15a1 formed by one end surface of the key member ₆ , and the key member 6 is pressed against the spring 8.
is pulled into the lens barrel against the elasticity of the lens.

At the same time, as the pushing piece 6a is pushed down, the pushed part 7a of the locking member 7 is pushed down by the pushing piece 6a, as shown in FIG. is rotated clockwise against the elasticity of the spring 13. Therefore, the locking portions 7b fit into the corresponding locked portions 3c, and the distance ring 3 is prevented from rotating. Therefore, after this, by applying rotational force by applying a finger to the distance ring 3, the entire lens barrel can be rotated, making it easier to attach the lens barrel to the camera body.

When the lens barrel is rotated and the pushing piece 6a moves to a position corresponding to the key notch 15b for fixing the body side mount member 15, as shown in FIG. 4C, the key member 6 is moved. , moves in the radial direction by the elasticity of the spring 8, fits the pushing piece 6a into the key notch 15b, prevents further rotation of the lens barrel, and moves the lens barrel against the camera body. position and secure. Moreover, by fitting the pusher piece 6a into the key notch 15b, the pusher piece 6a
The locking member 7 that has escaped the restriction a is rotated counterclockwise around the support shaft 12 by the elasticity of the spring 13. Therefore, the locking portion 7b is retracted from the locked portion 3c, and the locking of the distance ring 3 is released. Therefore, after the lens barrel is attached to the camera body, rotation of the distance ring 3 is allowed, and distance adjustment operation becomes possible.

FIG. 5 shows a modification of the locking member 7 shown in FIGS. 1 to 3 above. The locking member of this example consists of a push arm 7A and a locking lever 7B.
The push arm 7A and the locking lever 7B are coaxially pivoted to a support shaft 12 so as to be swingable. The push arm 7A has a support shaft 1
2, and one end is attached to the locking piece 11a of the fixing plate 11.
The other end of the torsion spring 13A is hooked to the torsion spring 13A, and is given the habit of rotating counterclockwise around the support shaft 12. A pushed portion _7A1 is formed at the free end. Further, the locking lever 7B has a restriction piece _7B1 at one end that restricts the counterclockwise rotation of the push arm 7A, and a restriction piece 7B1 that is fitted into the locked portion 3c of the distance ring 3 at the other end. A locking portion _7B2 is provided respectively. The locking lever 7B is wound around the support shaft 12, and is provided with a torsion spring 13B having one end locked to the push arm 7A, and a regulating piece 7B ₁ that extends around the support shaft 12. is given the habit of rotating clockwise so as to come into contact with the push arm 7A.

In this way, the push arm 7A and the locking lever 7B
If you use a locking member consisting of
Even if the locking part _7B2 of the lever 7B cannot completely fit into the locked part 3c of the distance ring 3 and the lever 7B can only rotate slightly clockwise, the push arm 7
Since A can be rotated clockwise against the elasticity of the springs 13A and 13B, there is no possibility that the key member 6 cannot be pulled into the lens barrel, and the lens barrel cannot be attached to the camera body. This problem can be effectively prevented from occurring.

FIG. 6 shows another embodiment of the invention.
The photographing lens barrel of this embodiment has a locking member 7 separate from the key member 6, whereas the photographing lens barrel of the embodiment shown in FIGS. The stop member 6c is provided integrally with the key member 6. That is, a locking member 6c is integrally provided to protrude forward from the lower end of the front surface of the key member 6, and the lower surface of the tip thereof slightly protrudes downward to form a locking portion 6d having a mountain diameter. There is. Furthermore, a valley-shaped locked portion 3d is continuously engraved over the entire circumference on the outer peripheral surface of the small-diameter cylindrical portion at the rear end of the distance ring 3, which faces the locking portion 6d.

The configuration of other members is the same as that of the lens barrel of the embodiment shown in FIGS. 1 to 3, so corresponding parts will be designated with the same reference numerals and detailed explanations will be given. Simply omit it.

According to the photographic lens barrel of this embodiment configured in this manner, the lens mount member 5 is aligned with the body mount member 15 of the camera body, and the lens barrel is pushed into the camera body. When rotated, the cam slope 1 of the bayonet notch 15a
The pusher piece 6a is pushed down by the lever _5a1 , and the key member 6 is drawn into the lens barrel. As a result, as shown in FIG. 7, the locking member 6c moves toward the center of the lens barrel, and the corresponding locked portion 3d of the distance ring 3
The locking portion 6d is fitted into the locking portion 6d. Therefore, rotation of the distance ring 3 is prevented, and the distance ring 3 is integrated into the lens barrel.
By applying a rotational force to the distance ring 3, the entire lens barrel can be rotated.

When the lens barrel is rotated and the pushing piece 6a moves to a position corresponding to the key notch 15b, the key member 6 moves back in the radial direction, fitting the pushing piece 6a into the notch 15b, and closing the lens. Fix the lens barrel to the camera body. Further, as the key member 6 moves back in the radial direction, the locking member 6c moves, the locking portion 6d retreats from the locked portion 3d, and the distance ring 3
The rotation blocking state is released.

In the above embodiment, the distance ring is fixed to the lens barrel when the photographing lens barrel is attached to the camera body, but the fixed lens operation member is not only the distance ring but also the aperture ring. Of course, it may also be a ring, a zoom ring, or the like.

Furthermore, although the above embodiments have been described using a bayonet mount type photographic lens barrel as an example, it goes without saying that the present invention can be similarly applied to a screw mount type photographic lens barrel.

As described above, according to the present invention, the lens operating member is temporarily integrated with the lens barrel as the photographic lens barrel is attached to the camera body, so as mentioned at the beginning of the specification, the lens operating member is temporarily integrated with the lens barrel. It is possible to provide a photographic lens barrel that is extremely convenient to use and eliminates the conventional problems.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the upper half of the photographic lens barrel showing an embodiment of the present invention, and FIG. 2 is a sectional view of the upper half of the photographing lens barrel shown in FIG. 3 is a cross-sectional view, and FIG. 3 is an enlarged perspective view of a main part showing in more detail the locking mechanism of the lens operating member in the photographing lens barrel shown in FIG. 1, and FIGS. 4A to 4C are
FIG. 5 is a rear end view of the photographing lens barrel showing the movement of the key member in the photographing lens barrel shown in FIG. 1 above, and FIG. An enlarged perspective view of the main part showing a modified example,
FIG. 6 is a sectional view of the upper half of the photographic lens barrel showing another embodiment of the present invention, and FIG. 7 is a cross-sectional view of the upper half of the photographing lens barrel shown in FIG. FIG. 3...Distance ring (rotation operation member), 3c, 3d...
...Locked part, 6...Key member, 6a...Pushing piece,
6c, 7...Locking member, 7A...Pushing arm, 7
B...Latching lever, (locking member), 6d, 7b, 7
B ₂ ...Locking part.

Claims (1)

[Claims] 1. A lens-side mount that engages with the camera-side mount, and a mechanism that is manually rotated around the optical axis with respect to the lens-side mount to drive a focusing lens, an aperture adjustment member, etc. a movable operation member; in a photographic lens barrel that is attached to and detached from the camera side mount by rotating the lens side mount around the optical axis, the lens side mount is integrated with the lens side mount around the optical axis. and is biased so as to protrude radially outward, and when the photographic lens barrel is attached, it contacts a part of the camera side mount, thereby resisting the biasing force and protruding radially inward. A key member that moves forward and protrudes by a biasing force when the attachment is completed, locks the lens side mount to the camera side mount, and enables manual reciprocating operation radially inward when the attachment is completed; In conjunction with the reciprocating movement of the key member, the forward movement of the key member engages with the locked portion of the rotary operating member to restrict the rotary operation of the rotary operating member. and a locking member formed with a locking portion that releases the engagement with the locked portion and releases the rotational restriction on the rotational operation member by a backward movement by a biasing force. Features a photographic lens barrel.