JPH07294797A - Lens barrel - Google Patents

Abstract

PURPOSE:To restrain the lowering of the strength of a lens barrel because of the increase of the number of optical members by limiting the movement of a rear bottom board as the optical member having a fitting part and a moving throttle plate by the change of the groove width of a guiding groove. CONSTITUTION:Three guiding grooves 102a which the cam shaft 107a of the rear bottom board and the projection part 109C of the moving throttle plate penetrate and whose groove width is changed; a locking part 102c in which the moving throttle plate is locked; and three guiding grooves 102b which a cam shaft 112a formed on a 2nd lens frame penetrates are formed at equal intervals on the circumference of a fixed barrel fixed in a camera main body. The cam shafts 107a and 112a straight advance and move with the grooves 102a and 102b as a guide, respectively. In the case of extending a photographing optical system, the projection part 109b is locked in the locking part 102c formed in the groove 102a and the moving throttle plate is stopped. By changing the width of the groove 102a formed in the fixed barrel and guiding the photographing optical system in a circumferential direction, the movement of the moving throttle plate is limited by utilizing the groove 102a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical member having a fitting portion and a lens barrel having a guiding groove for fitting the fitting portion to guide movement of the optical member.

[0002]

2. Description of the Related Art Conventionally, the guide of a movable diaphragm plate which moves linearly in the optical axis direction in conjunction with a photographing optical system used for a lens barrel guides a guide groove for guiding the photographing optical system and a movable diaphragm plate. The guide groove was formed in each fixed cylinder.

[0003]

However, in the above-mentioned conventional example, when the lens barrel structure has a plurality of taking lenses and a plurality of movable diaphragm plates, the guide groove formed in the fixed barrel accordingly. However, the strength of the fixed barrel becomes weak, and the lens barrel is damaged due to impact or the like, so that it is not possible to provide a plurality of movable diaphragm plates, and as a result, ghost and flare are caused.

In order to solve such a conventional problem, an object of the present invention is to provide a lens barrel which does not reduce the strength of a fixed barrel even in a barrel structure having a plurality of photographing lenses and a plurality of movable diaphragm plates. To do.

[0005]

In order to achieve the above-mentioned object, the invention according to the first aspect of the present invention is an optical member having a fitting portion and the fitting member is fitted to the optical member. A lens barrel having a guide groove for guiding the movement of
The first optical member having the fitting portion of No. 1, the second optical member having the second fitting portion, and the first optical member having the groove width changed to limit the movement of the first or second optical member. By providing the guide groove of the second optical member, the number of guide grooves can be reduced, and the strength of the lens barrel is not reduced.

According to a second aspect of the present invention, there is provided an optical device having a guide groove in which an optical member having a fitting portion and an outer fitting portion are fitted to guide movement of the optical member. A first optical member having a fitting portion, a second optical member having a second fitting portion, a guide means for guiding the first optical member, and a movement of the first optical member. A plurality of optical members without increasing the number of guide grooves by being constituted by the guide grooves of the second optical member having limiting means for limiting.
The strength of the lens barrel is not reduced.

[0007]

1 to 3 show a first embodiment of the present invention.

FIG. 1 is a sectional view showing a WIDE state, FIG. 2 is a sectional view showing a state where a movable diaphragm plate is locked, and FIG. 3 is a sectional view showing a TELE state.

In FIGS. 1 to 3, reference numeral 1 denotes a camera body, on which a photographing screen frame 1a is formed. A fixed cylinder 2 is fixed to the camera body 1 with a screw, and a helicoid screw 2a, a rear base plate 7 and a movable diaphragm plate 8 which will be described later are linearly moved in the optical axis direction on the inner periphery of the movable diaphragm plate 8. Locking portion 2 which is a limiting means for limiting the movement of the movable diaphragm plate 8 for locking 8b.
Guide grooves 2b having three steps provided with c are formed at equal intervals.

Reference numeral 3 denotes a rotary cylinder, the front end of which is in contact with the blade retainer 4 and the rear end of which is in contact with a rear base plate 7, which will be described later, and which is held between the blade retainer 4 and the rear base plate 7 and fixed to the outer periphery. A helicoid screw 3a that meshes with the second helicoid screw 2a is formed, and the rotation of the rotary cylinder 3 advances and retracts the photographing optical system along the helicoid screw 2a in the optical axis direction.
A cam groove 3b into which a cam shaft 11a of a second group lens frame 11 described later is slidably fitted is formed in the inner circumference in the circumferential direction, and a gear 3c that meshes with a known lens barrel driving means is formed.

Numeral 4 holds a shutter unit 6 in which a first group lens frame 5 is supported by a blade presser.

Reference numeral 7 denotes a rear base plate, which is a second optical member fixed to the blade retainer 4 with screws and supporting the photographing optical system.
A flange portion 7a for holding the rotary cylinder 3 is provided at the rear end portion, and three projection portions 7b as a second fitting portion slidably fitted with the guide groove 2b are provided at the tip end of the flange portion 7a. Formed at equal intervals, the photographing optical system is moved straight in the optical axis direction using the guide groove 2b as a guide. Further, three guide grooves 7c which penetrate the cam shaft 11a of the second group lens frame 11 described later and linearly move in the optical axis direction are formed at equal intervals on the circumference, and the tension spring 9 is applied to the inside of the guide groove 7c. Two V-shaped shafts 7d are planted.

Reference numeral 8 is a movable diaphragm plate serving as a first optical member, and a screen frame 8a is formed on the outer periphery thereof, and three projections as a first fitting portion slidably fitted to the guide groove 2b. 8b is formed in the same direction as the protruding portion 7b so as to travel from the protruding portion 7b, and hooks 8c for hooking the tension spring 9 are provided at two places on the flat surface portion.

Numeral 9 is a tension spring for urging the movable diaphragm plate 8 forward to bring it into contact with the flange portion 7a.
The rear base plate 7 is supported. One end is hooked on the shaft 7d of the rear base plate 7, and the other end is hooked on the hook 8c of the movable diaphragm plate 8.

Reference numeral 10 is a taking lens, 11 is a second group lens frame for holding the taking lens 10, and three cam shafts 11a for slidably fitting the cam groove 3b are formed on the outer periphery at equal intervals. .

A compression spring 12 is provided between the blade retainer 4 and the second group lens frame 11, and the second group lens frame 1 is provided.
1 is pushed rearward to surely bring the cam shaft 3b into contact with the cam groove 3b to stabilize the lens interval.

In the above-mentioned structure, when the photographing optical system is moved in the extending direction (to the TELE side), if the switch SW (not shown) is switched, the rotary barrel 3 is driven by the known lens barrel driving means.
Rotates counterclockwise and moves forward along the helicoid screw 2a. At this time, the rotary cylinder 3 pushes up the blade retainer 4 to move the photographing optical system forward, and the movable diaphragm plate 8 is in contact with the rear base plate 7 while the projections 7b and 8b move straight with the guide groove 2b as a guide. As shown in FIG. 2, the protruding portion 8b is locked by the locking portion 2c, and the movable diaphragm plate 8 stops halfway. When the rotary cylinder 3 is further rotated, the photographing optical system moves straight while charging the tension spring 9, as shown in FIG. 3, and stops by detecting a position detection SW (not shown). At the same time, the second group lens frame 11 also moves straight forward with the guide groove 7c as a guide while compressing the compression spring 11 along the cam groove 3b.

In addition, in the direction in which the photographing optical system is retracted (WI
In the case of moving to the DE side), when the changeover switch (not shown) is switched, the rotary barrel 3 is rotated clockwise by the known lens barrel driving means and is moved rearward along the helicoid screw 2a.
At this time, the rotary cylinder 3 pushes down the flange portion 7a of the rear base plate 7 to move the photographing optical system backward, and the projection portion 7b moves straight with the guide groove 2b as a guide. During the movement, the flange portion 7a comes into contact with the movable diaphragm plate 8 as shown in FIG. 2, and thereafter, while pushing the movable diaphragm plate 8, the projection portion 8b also linearly moves backward with the guide groove 2b as a guide, and a position not shown. The detection SW is detected and stopped at the position shown in FIG.

As described above, according to the present invention, the guide groove 2d for guiding the photographing optical system formed in the fixed barrel 2 is formed into a stepped shape having different heights in the direction orthogonal to the optical axis, thereby guiding The movable diaphragm plate 8 can be guided and locked using the groove 2b.

4 to 7 show a second embodiment of the present invention.

FIG. 4 is a sectional view showing the WIDE state, FIG. 5 is a developed view of the inner surfaces of the fixed cylinder and the rotating cylinder in the state shown in FIG. 4, and FIG. 6 is a sectional view showing the movable diaphragm plate being locked. 7 is shown in FIG.
FIG. 3 is an inner surface development view of a fixed barrel and a rotary barrel in the state of

In FIGS. 4 to 7, reference numeral 101 denotes a camera body on which a photographing screen frame 101a is formed.

Reference numeral 102 is a fixed tube fixed to the camera body 101 with a screw, and three guide grooves 102a having three groove widths which penetrate a cam shaft 107a of a rear base plate 107 and a protrusion 109c of a movable diaphragm plate 109, which will be described later. And the guide groove 102a
A locking portion 102c for locking the movable diaphragm plate 109,
The cam shaft 1 formed on the second group lens frame 112 described later.
Three guide grooves 102b which penetrate 12a are formed at equal intervals on the circumference, and the cam shaft 107a linearly moves with the guide groove 102a and the cam shaft 112a using the guide groove 102b as a guide. A flange 102d for receiving a rotary cylinder 103, which will be described later, is formed at the rear end portion.

A rotary cylinder 103 is rotatably fitted to the outer circumference of the fixed cylinder 102, is held between the flange portion 102d and the rotary cylinder pressing unit 104, and has a guide groove 10 on its inner circumference.
The cam shaft 107a passing through 2a is slidably fitted 3
Three cam grooves 103a and three cam grooves 103b into which the cam shaft 111a penetrating the guide groove 102b is slidably fitted
Are formed at equal intervals in the circumferential direction. A gear 103c interlocking with a known lens barrel driving means is formed on the outer circumference, and when the rotating barrel 103 is rotated by the known lens barrel driving means, the cam shaft 107a becomes the cam groove 102a and the cam shaft 111a becomes the cam groove 102b. Go back and forth along.

A rear base plate 107 is fixed to the shutter unit 106 supporting the first-group lens frame 105 with screws, and holds the shutter unit 106. Three cam shafts 107a slidably fitted into the cam grooves 103a via guide grooves 102a are formed on the outer peripheral portion at equal intervals in the circumferential direction. A fixed diaphragm plate 10 to be described later is provided at the rear end portion.
The three coupling claws 107b for supporting 8 are formed at equal intervals.

Reference numeral 108 denotes a fixed diaphragm plate, and a screen frame 108a,
Shaft hole 108b slidably fitted with the guide bar 110
And three coupling claws 108c are formed at equal intervals, and by hooking the coupling claws 108c on the coupling claws 107b,
The fixed diaphragm plate 108 is moved integrally with the rear base plate 107.

Reference numeral 109 denotes a moving diaphragm plate, which is a screen frame 109a.
Three protrusions 10 into which the guide bar 110 is press-fitted and which is slidably fitted in the shaft hole 109b and the outer periphery of the guide groove 102b.
9c are formed at equal intervals and are supported by the rear base plate 107 by the guide bar 110.

Reference numeral 110 denotes a guide bar having a T shape.
It is press-fitted into the shaft hole 109b via the fixed diaphragm plate 108.

Reference numeral 111 is a compression spring, which is a guide bar 11.
0 as a guide and the tip of the guide bar 110 and the fixed diaphragm plate 1
08, the movable diaphragm plate 109 is pulled forward and brought into contact with the fixed diaphragm plate 108.

Reference numeral 112 denotes a second group lens frame which holds the photographing optical system, and three cam shafts 112a which are slidably fitted in the cam grooves 102b are formed on the outer periphery at equal intervals.

A compression spring 113 is provided between the rear base plate 107 and the second lens group frame 112, and pushes the second lens group frame 112 rearward so that the cam shaft 112a is in the cam groove 1.
03b is surely contacted to stabilize the lens interval.

In the above structure, when the photographing optical system is moved in the feeding direction (to the TELE side), if the switch SW (not shown) is switched, the rotary barrel 1 is driven by a known lens barrel driving means.
03 rotates counterclockwise, and the cam shaft 107a moves to the cam groove 1
03a along the guide groove 102a as a guide, and the cam shaft 112a along the cam groove 103b as the guide groove 102b as a guide, the rear base plate 107 and the second lens group frame 112 move straight forward and are fixed at the same time. The diaphragm plate 108 and the movable diaphragm plate 109 move forward linearly together with the rear base plate 107 using the guide groove 102a as a guide. At this time, the protrusion 109b is shown in FIG.
The movable diaphragm plate 109 is stopped at the position shown in FIG. 6 by being locked by the locking portion 102c provided in the guide groove 102a, and the rotary cylinder 103 is further rotated counterclockwise so that the rear base plate 107 (photographing optical system) is While moving straight ahead, fixed diaphragm plate 1
At 08, while charging the compression spring 111, it moves straight ahead and stops by detecting a position detection switch (not shown).

In the direction in which the photographing optical system is retracted (WI
In the case of moving to the DE side), when a changeover switch (not shown) is switched, the rotary barrel 3 is rotated clockwise by a known lens barrel driving means, and the cam shaft 107a guides the guide groove 102a along the cam groove 103a. Further, the cam shaft 112a is guided along the cam groove 103b by the guide groove 102b, and the rear base plate 1
07 and the second lens group frame 112 move straight rearward, the movable diaphragm plate 109 locked by the locking portion 102c is pushed down by the fixed diaphragm plate 108, and moves straight backward by using the guide groove 102a as a guide. A position detection SW (not shown) is detected and the operation is stopped at the position shown in FIG.

Thus, according to the present invention, the fixed barrel 102 is used.
A guide groove 102a for guiding the photographing optical system formed on
By changing the width in the circumferential direction, the movable diaphragm plate 109 can be guided and locked using the guide groove 102a.

8 to 10 show a third embodiment of the present invention.

FIG. 8 is a sectional view showing the WIDE state, and FIG. 9 is a sectional view showing the state in which the first movable diaphragm plate is locked.
FIG. 10 is a sectional view showing a state in which the first and second movable diaphragm plates are locked.

8 to 10, the same functions as those in the first embodiment are represented by the same numbers.

The third embodiment differs from the first embodiment in that the guide groove formed in the fixed barrel 2 has a guide groove (not shown) for guiding the rear base plate 7 (photographing optical system), One moving diaphragm plate 8 and a second moving diaphragm plate 13 to be described later guide a first locking portion 2c that locks the protruding portion 8b and a second locking portion 2e that locks the protruding portion 13b. The provided guide groove 2d is formed.

A second moving diaphragm plate 13 is newly provided,
Similar to the first movable diaphragm plate 8, the screen frame 13a, and the three protrusions 13b slidably fitted to the guide groove 2d on the outer circumference may travel in the same direction as the protrusion 8b from the protrusion 8b. And a hook 13c for hanging the tension spring 14 on the flat surface portion is provided at two places. Along with this, a tension spring 14 is provided to urge the second movable diaphragm plate 13 forward to bring it into contact with the movable diaphragm plate 8 and to support it on the rear base plate 7. Since only the end is hooked on the hook 13c of the movable diaphragm plate 13, the other parts are the same as those in the first embodiment, and the description thereof will be omitted.

In the above-mentioned structure, when the photographing optical system is moved in the feeding direction (to the TELE side), when the switch SW (not shown) is switched, the rotary barrel 3 is driven by the known lens barrel driving means.
Rotates counterclockwise and moves forward along the helicoid screw 2a. At this time, the rotary cylinder 3 pushes up the blade retainer 4 to move the photographing optical system forward, and the projection (not shown) formed on the rear base plate 7 is guided by the guide groove (not shown) formed on the fixed cylinder 2. While moving straight ahead, the first movable diaphragm plate 8 is in contact with the rear base plate 7, the second movable diaphragm plate 13 is in contact with the first movable diaphragm plate 8, and the projections 8b and 13b are in the guide grooves 2d.
, The protrusion 13b is locked by the locking portion 2e as shown in FIG. 9, the second moving diaphragm plate 13 is stopped halfway, and the rotary cylinder 3 is further rotated, so that the tension spring 14 is moved. While charging, the photographic optical system moves straight ahead, and the projection 8b of the first moving diaphragm 8 is guided by the guide groove 2d.
The guide 8b moves straight, and the projection 8b is locked by the locking portion 2c as shown in FIG. 10, and the first movable diaphragm plate 8 stops halfway. Further, the rotary cylinder 3 rotates, and a position detection SW (not shown) is detected and stopped. At the same time, the second group lens frame 11 also compresses the compression spring 11 along the cam groove 3b,
It moves straight forward with the guide groove 7c as a guide.

In the direction in which the taking optical system is retracted (WI
In the case of moving to the DE side), when the changeover switch (not shown) is switched, the rotary barrel 3 is rotated clockwise by the known lens barrel driving means and is moved rearward along the helicoid screw 2a.
At this time, the rotary cylinder 3 pushes down the flange portion 7a of the rear base plate 7 to move the photographing optical system rearward, and the projection portion (not shown) formed on the rear base plate 7 is guided on the fixed cylinder 2 (not shown). Move straight along the groove. During the movement, the flange portion 7a comes into contact with the first movable diaphragm plate 8 as shown in FIG. 10, and then the protrusion 8b is pushed while pushing the first movable diaphragm plate 8.
Moves straight backward with the guide groove 2d as a guide. Further, the rotary cylinder 3 rotates, and the first moving diaphragm plate 8 contacts the second moving diaphragm plate 13 as shown in FIG. 9, and then the second moving diaphragm plate 1
While pressing 3, the protrusion 13b also moves straight backward with the guide groove 2d as a guide, and detects a position detection SW (not shown) to detect the position shown in FIG.
Stop at the position shown in.

In this way, according to the present invention, the guide groove 2d for guiding one movable diaphragm plate formed on the fixed barrel 2 is formed into a stepped shape having different heights in the direction orthogonal to the optical axis. The guide groove 2d can be used to guide and lock the first movable diaphragm plate 8 and the second movable diaphragm plate 13.

[0043]

As described above, in the lens barrel having the optical member having the fitting portion and the guide groove for fitting the fitting portion and guiding the movement of the optical member, the first fitting is performed. A first optical member having a portion, a second optical member having a second fitting portion, and first and second limiting movement of the first or second optical member due to a change in groove width. By providing the guide groove for the optical member, even if the number of optical members is increased, the guide groove is not increased, so that the strength of the lens barrel is not reduced.

According to the second aspect of the invention,
In a lens barrel having an optical member having a fitting portion and a guide groove for fitting the fitting portion to guide movement of the optical member, a first optical member having a first fitting portion; Of the second optical member having a second optical member having two fitting portions, a guide means for guiding the first optical member, and a restricting means for restricting movement of the first optical member. Since the guide groove is used, a plurality of optical members can be guided without reducing the strength of the lens barrel.

[Brief description of drawings]

FIG. 1 is a sectional view showing a WIDE state in a first embodiment of the present invention.

FIG. 2 is a sectional view showing a state in which the movable diaphragm plate is locked in the first embodiment of the present invention.

FIG. 3 is a sectional view showing a TELE state in the first embodiment of the present invention.

FIG. 4 is a sectional view showing a WIDE state according to the second embodiment of the present invention.

5 is a second embodiment of the present invention, the fixed cylinder in the state of FIG. 4,
The inner surface development view of a rotating cylinder.

FIG. 6 is a sectional view showing a state in which a movable diaphragm plate is locked in the second embodiment of the present invention.

FIG. 7 is a second embodiment of the present invention, the fixed barrel in the state of FIG. 6;
The inner surface development view of a rotating cylinder.

FIG. 8 is a sectional view showing a WIDE state in the third embodiment of the present invention.

FIG. 9 is a sectional view showing a state in which the first movable diaphragm plate is locked in the third embodiment of the present invention.

FIG. 10 is a sectional view showing a state where the first and second movable diaphragm plates are locked in the third embodiment of the present invention.

[Explanation of symbols]

 1,101 Camera body 2,102 Fixed cylinder 2a, 3a Helicoid screw 2b, 2d, 7c, 102a, 102b Guide groove 2c, 2e, 102c Locking part 3,103 Rotating cylinder 3b, 103a, 103b Cam groove 3c, 103c Gear 4 Blade retainer 5,105 1st group lens frame 6,106 Shutter unit 7,107 Rear base plate 7a, 102d Flange part 7b, 8b, 13b, 109b Projection part 7d Axis 8 Moving diaphragm plate (1st moving diaphragm plate) 8c Hook 9,14 Tensile spring 10 Photographing lens 11,112 Second group lens frame 11a, 107a, 112a Cam shaft 12, 111, 113 Compression spring

Claims (4)

[Claims] 1. A lens barrel having an optical member having a fitting portion and a guide groove for fitting the fitting portion to guide the movement of the optical member, wherein the first fitting portion has a first fitting portion. An optical member, a second optical member having a second fitting portion, and a guide groove for the first and second optical members that restricts movement of the first or second optical member by changing the groove width. A lens barrel having: 2. A lens barrel having an optical member having a fitting portion and a guide groove for fitting the fitting portion to guide the movement of the optical member, wherein the first fitting portion has a first fitting portion. An optical member; a second optical member having a second fitting portion; guide means for guiding the first optical member; and restriction means for restricting movement of the first optical member. A lens barrel composed of the guide grooves of the second optical member. 3. The lens barrel according to claim 2, wherein the limiting means is a stepped portion having different heights in the shape of the guide groove in a direction orthogonal to the optical axis. 4. The lens barrel according to claim 2, wherein the limiting means changes the groove width of the guide groove in the circumferential direction.