JPH0755545Y2 - Camera lens lens barrel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of application" The present invention relates to a taking lens barrel of a camera including a taking lens barrier and an interlocking member for opening and closing the taking lens barrier.

"Prior Art" As a taking lens barrel of a conventional camera, a turning member is screwed into a camera body, and a key extending in the optical axis direction is fixed, and the turning member holds the barrel. When the holding member engraved with the key groove is screwed and the rotating member is rotated forward and backward, the holding member and the lens barrel move straight forward and backward by the engagement between the key and the key groove, and are assembled to the lens barrel. In some cases, the interlocking member is driven by a cam member fixed to the camera body, and the interlocking member is driven to open and close the photographing lens barrier.

[Problems to be solved by the invention] However, in such a conventional photographing lens barrel of a camera, since the cam member is purposely provided in the camera body, the number of parts is increased and the cost is increased. There is a problem in that a mounting space is required, which hinders downsizing of the camera.

The present invention has been made by paying attention to the problems of the conventional technique, and the key and the cam member are integrally provided to reduce the number of parts to prevent the cost from increasing. It is an object of the present invention to provide a taking lens barrel for a camera, which can improve the space efficiency by eliminating the mounting space for the cam member.

[Means for Solving the Problem] The gist of the present invention for achieving such an object is to take a photographing lens barrier (60) and an interlocking member (70) for opening and closing the photographing lens barrier (60).
A holding member (40) for holding a lens barrel (50) incorporating the taking lens barrier (60) and the interlocking member (70), and a helicoid (34) screwed with the holding member (40). ) And a rotating member (30) having another helicoid (32) screwed to the fixed barrel (20) fixed to the camera body (10), and extending in the optical axis direction to The key (24) fixed to the fixed cylinder (20) and engaged with the key groove (44) formed in the holding member (40), and the holding member (40) rotate the key (24). ) And the key groove (44) are engaged, and the photographing lens barrier (60) is opened and closed when the photographing lens barrier (60) is moved straight in the optical axis direction in response to the rotation of the rotating member (30). And a cam section (25) for driving the interlocking member (70), wherein the cam section (25) is The present invention resides in a taking lens barrel of a camera characterized by being formed on the key (24).

"Operation" When the rotating member is rotated, the holding member moves straight by the engagement of the key on the camera body side and the key groove on the holding member side. As a result, the lens barrel moves straight along with the holding member,
The interlocking member also moves straight.

When the interlocking member moves straight, it hits a cam portion formed on the key on the camera body side, and the interlocking member is driven by the cam portion. This opens and closes the photographic lens barrier.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

Each drawing shows an embodiment of the present invention.

FIG. 1 is a cross-sectional view of a taking lens barrel of a camera showing a photographing state in which a lens barrel is extended, and FIG. 2 is a diagram showing a non-photographing state in which a lens barrel is extended in the same sectional view. .

As shown in FIGS. 1 and 2, a female helicoid 22 is engraved on the inner peripheral wall of the fixed barrel 20 fixed to the camera body 10, and the outer peripheral wall of the rotating member 30 fitted inside the fixed barrel 20. Is engraved with a male helicoid 32 that is screwed into the female helicoid 22.

A female helicoid 34 is engraved on the inner peripheral wall of the rotating member 30,
A male helicoid 42, which is screwed into a female helicoid 34, is engraved on the outer peripheral wall of the holding member 40 fitted in the rotating member 30.

A gear 35 is engraved on the outer peripheral wall of the rotating member 30, and the gear 35 is meshed with a pinion gear (not shown) that is interlocked with the rotation of a drive source such as a motor (not shown).

A key 24 extending long in the optical axis direction is provided inside the holding member 40.
, And one end of the key 24 is fixed to the fixed barrel 20 with a screw 26.

On the inner peripheral wall of the holding member 40, a key on the side of the fixed cylinder 20 is arranged so that the holding member 40 moves straight forward and backward according to the forward and reverse rotation of the rotating member 30.
A keyway 44 that engages with 24 is engraved.

A straight lens barrel 50 is fixed to the holding member 40 with screws 52. A photographic lens barrier 60 is mounted on the front surface of the rectilinear lens barrel 50.

FIG. 3 is a front view of the photographing lens barrier 60 showing a photographing state in which the photographing lens barrier 60 is opened, and FIG. 4 is a front view showing a non-photographing state in which the photographing lens barrier 60 is closed. is there.

As shown in FIGS. 3 and 4, the photographing lens barrier 60 is swingably supported by a pivot 51 that is planted in the front surface of the rectilinear lens barrel 50, and the closing spring 52 wound around the pivot 51 causes the first lens 51 to move. It is biased in the closing direction which is the counterclockwise direction in FIG.
Also, a small cylindrical protrusion 62 is provided on the base end of the taking lens barrier 60.
Are formed.

An interlocking ring 70, which is an interlocking member, is attached to the rectilinear lens barrel 50 together with the taking lens barrier 60 so as to be rotatable around the optical axis as a central axis.
The interlocking ring 70 is biased counterclockwise in FIG. 3 by an opening spring 53 stretched between the interlocking ring 70 and the rectilinear lens barrel 50.

On the outer peripheral edge of the interlocking ring 70, when the interlocking ring 70 is rotated in the counterclockwise direction by the opening spring 53, the photographing lens barrier 60 is swung clockwise against the biasing force of the closing spring 52 to open the state. Therefore, a pushing protrusion 72 for pushing the small cylindrical protrusion 62 of the photographing lens barrier 60 is formed.

A flange portion 73 bent toward the inside of the straight-moving lens barrel 50 is provided on the outer peripheral edge of the interlocking ring 70, and a key is provided at the tip of the flange portion 73.
The interlocking pin 74 is planted facing the front end of 24.

A cam portion 25 engageable with the interlocking pin 74 is formed at the front end portion of the key 24 in order to rotate the interlocking ring 70 in accordance with the rectilinear reciprocating movement of the rectilinear lens barrel 50. The cam portion 25 has an inclined surface 26 on which the interlocking pin 74 is pushed in the circumferential direction with respect to the key 24, and a parallel surface 27 parallel to the optical axis that moves along the optical axis direction.

The operation of the taking lens barrel having the above configuration will be described below.

In the shooting states shown in FIGS. 1 and 3, the interlocking pin 74 of the interlocking member 70 is not in contact with the cam portion 25 of the key 24, and the pushing protrusion 72 of the interlocking member 70 causes the urging force of the opening spring 53. The small cylindrical protrusion 62 of the photographing lens barrier 60 is pushed against the biasing force of the closing spring 52 by
60 is open.

In this state, when the operation member (not shown) is switched to the non-photographing state, the drive source such as a motor (not shown) also rotates. As a result, the rotating member 30 rotates via the gear 35.

The holding member 40, which is screwed into the rotating member 30 via the male helicoid 42, is prevented from rotating by the engagement of the key 24 and the key groove 44. According to the lead of the helicoid 42, it is retracted from the position in the photographing state shown in FIG. 1 along the optical axis in the A1 direction in FIG.

By the movement of the holding member 40 in the A1 direction, the rectilinear lens barrel 50 and the interlocking ring 70 mounted on the rectilinear lens barrel 50 move in the A1 direction, and eventually the interlocking pin 74 of the interlocking ring 70 and the cam portion formed on the key 24. twenty five
The sloping surface 26 comes into contact.

When the rotating member 30 further rotates and the holding member 40 moves in the A1 direction, the interlocking pin 74 of the interlocking ring 70 moves along the inclined surface 26 of the cam portion 25. As a result, the interlocking ring 70 rotates clockwise in FIG. 3 against the biasing force of the opening spring 53, and the interlocking ring 70 is rotated.
The interlocking pin 74 of the above retracts from the small cylindrical protrusion 62 of the taking lens barrier 60 which has been pushed in up to that point.

When the interlocking pin 74 of the interlocking ring 70 retracts from the small cylindrical projection 62 of the taking lens barrier 60, the taking lens barrier 60 is not blocked by the interlocking pin 74, and is urged by the closing spring 52 to rotate clockwise in FIG. It swings to the closed state shown in FIG.

From the non-photographing state shown in each of FIGS. 2 and 4, the driving member such as a motor (not shown) causes the turning member 30 to turn in the opposite direction from the non-photographing state shown in FIG. Then, the holding member 40 moves in the A2 direction in FIG.

As a result, the interlocking pin 74 of the interlocking ring 70 becomes parallel to the parallel surface 27 of the cam portion 25.
Move in the direction of A2. Since the interlocking pin 74 does not move in the circumferential direction while moving along the parallel surface 27, the interlocking ring 70 also does not rotate, and the taking lens barrier 60 remains closed.

When the holding member 40 further moves in the A2 direction in FIG. 2, the interlocking pin 74 of the interlocking ring 70 is disengaged from the parallel surface 27 of the cam portion 25. When the interlocking pin 74 comes off, the interlocking pin 74 moves while contacting the inclined surface 26 by the biasing force of the opening spring 53.

When the interlocking pin 74 moves while contacting the inclined surface 26, the interlocking ring 70 rotates counterclockwise in FIG. 4, and the pushing protrusion 72 of the interlocking ring 70 in the retracted position is the small cylinder of the photographing lens barrier 60. Gradually approaching the circular protrusion 62, and eventually a small cylindrical protrusion.
Push in 62. As a result, the photographing lens barrier 60 is pivoted 51
Is pivoted in the clockwise direction in FIG. 4 to the open state shown in FIG.

[Advantage of Invention] According to the taking lens barrel of the camera of the present invention, since the cam portion for opening and closing the taking lens barrier is formed integrally with the key, the number of parts is reduced and the cost is not increased. As a result, a mounting space is not required and the space efficiency is improved, and the camera can be made compact, for example.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention.
FIG. 4 is a sectional view showing a main part of the camera body cut away, FIG. 2 is a sectional view showing the same main part, and FIG. 3 is a front view showing a part of the photographing lens barrel of the camera cut away. The figure is also a front view. 10 …… Camera body, 20 …… Fixed cylinder 24 …… Keys, 25 …… Cam section 30 …… Rotating member 32 …… Male helicoid 34 …… Female helicoid 40 …… Holding member, 44 ...... Key groove 50 …… Straight barrel (lens barrel) 60 …… Shooting lens barrier 70 …… Interlocking ring (interlocking member)

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Yoshio Imura 1-6-3 Nishioi, Shinagawa-ku, Tokyo Inside Nikon Oi Manufacturing Co., Ltd. (72) Noboru Akami 1-3-6 Nishioi, Shinagawa-ku, Tokyo Nikon Oi Manufacturing Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A photographic lens barrier, an interlocking member for opening and closing the photographic lens barrier, a holding member for holding a lens barrel incorporating the photographic lens barrier and the interlocking member, and one screwed with the holding member. And a rotating member having another helicoid that is screwed to a fixed barrel that is fixed to the camera body, and is fixed to the fixed barrel that is extended in the optical axis direction. The key engaging with the engraved key groove and the holding member are prevented from rotating by the engagement of the key and the key groove, and move straight in the optical axis direction in response to the rotation of the rotating member. In a photographing lens barrel of a camera having a cam portion for driving the interlocking member to open and close the photographing lens barrier when moved, the camera portion characterized in that the cam portion is formed on the key. lens Cylinder.