JPH11119082A - Optical lens barrel and optical device using the lens barrel - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To properly set the load of an operation member. SOLUTION: In an optical lens barrel in which a lens driving system 21 movably provided inside a fixed lens barrel 3 is driven by an operation ring 5 rotatably provided on the outer periphery of the fixed lens barrel 3, the operation ring 5 is an inner ring. An elastic member 23 is provided on the peripheral surface side, and the fixed lens barrel 3 has a load applying member 26 that slidably contacts the elastic member 23 via grease so as to apply a load to the operation ring 5.
By sliding the load applying member 26 to change the area of the elastic member 23 and the sliding contact portion 27 of the load applying member 26,
The load on the operation ring 5 is changed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical lens barrel for manually or electrically operating an operating member for adjusting focus, zoom, and iris, and an optical apparatus using the optical lens barrel. .

[0002]

2. Description of the Related Art Conventionally, an optical apparatus such as a television camera has an optical lens barrel such as a photographing lens, and the optical lens barrel has optical members such as a focus lens, a zoom lens, and an iris diaphragm movably therein. . In addition, the optical lens barrel is provided with operation members such as a focus operation ring, a zoom operation ring, and an iris operation ring for driving an optical member so as to be rotatable on the outer peripheral surface. Then, the user of the optical lens barrel drives the optical member by operating the operation member, and adjusts the focus, zoom, and iris.

In this type of optical lens barrel, the operation member can be manually operated and electrically operated, and the optical lens barrel has a drive unit for driving the operation member by electric power. . The drive unit includes a drive motor, and includes a power transmission mechanism that transmits the power of the drive motor to the operation member, and a power cutoff mechanism that blocks transmission of the power of the drive motor to the operation member.

In general, in order to improve the feeling of manual operation of the operating member and prevent the operating member from rotating due to its own weight, it is necessary to apply an appropriate load to the operating member. On the other hand, in order to drive the operation member at high speed and to save power consumption of the drive motor, it is necessary to reduce the load on the operation member.

[0005]

However, when the load on the operating member is reduced, the operating member rotates only when it is lightly touched, or rotates smoothly when operated at a low speed. Or not. In order to solve such a problem, conventionally, an elastic member is fixed to the load applying member side so that the outer peripheral surface of the elastic member and the inner peripheral surface of the operating member are in sliding contact with each other, or a high-viscosity grease is applied to the sliding contact portion of the operating member. A load is applied to the operation member with a friction member or the like interposed therebetween. However, when the elastic member is fixed to the load applying member side, it is difficult to reduce the size, and the load on the operating member can be improved in both the manual operation and the electric operation by simply interposing the high-viscosity grease and the friction member. There is a problem that it is impossible to set.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide a compact optical lens barrel capable of favorably setting a load on an operating member in both a manual operation and an electric operation, and an optical lens using the lens barrel. It is to provide a device.

[0007]

An optical lens barrel according to the present invention for achieving the above object has an optical member movably provided inside a lens barrel body rotatably mounted on the outer periphery of the lens barrel body. In the optical lens barrel driven by the provided operating member, the operating member has an elastic member on an inner peripheral surface side, and the lens barrel main body is displaceably slidably contacted with the elastic member via a viscous fluid to contact the operating member. It has a load applying member for applying a load.

An optical device according to the present invention is an optical device in which an optical member movably provided inside the lens barrel main body is driven by an operation member rotatably provided on the outer periphery of the lens barrel main body. The operation member has an elastic member on the inner peripheral surface side,
The lens barrel main body includes a load applying member that slidably contacts the elastic member via a viscous fluid so as to apply a load to the operating member.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the illustrated embodiment. FIG. 1 is a partially cutaway side view of a first embodiment of an optical barrel, and FIG. 2 is a rear view. The optical barrel is a taking lens 1 attached to an optical device such as a television camera. The photographing lens 1 is provided with a drive unit 2. A focus lens, zoom lens, iris and the like (not shown) sharing one optical axis are provided inside the fixed lens barrel 3 of the photographing lens 1, and these focus lens and zoom are provided on the outer periphery of the fixed lens barrel 3. A substantially cylindrical operation ring 4, 5, 6 for driving a lens, an iris and the like is provided rotatably.

The drive unit 2 is configured to drive the operation ring 5, for example, and the drive unit 2 is provided with an operation member 2a for operating the operation ring 5. As shown in the partial sectional view of FIG. 3, an intermediate gear 8 is slidably and rotatably supported on the shaft 7 of the drive unit 2, and the teeth 8 a of the intermediate gear 8 are freely meshable with the teeth 5 a of the operation ring 5. Have been. A pin 10 of a clutch plate 9 is engaged with the intermediate gear 8, and the intermediate gear 8 is driven forward and backward by rotation of the clutch plate 9. The clutch plate 9 is driven in conjunction with a switching knob described later.

An output gear 11 meshes with the intermediate gear 8,
The output gear 11 is connected to a drive motor 13 via a speed change means 12. At this time, the output shaft 14 of the transmission 12
, A sleeve 15 is fixed by a pin 16, the output gear 11 is rotatably mounted on the sleeve 15, and the sleeve 15 is urged toward the drive motor 13 by a spring 18 via a slide washer 17. Thus, a torque limiter is formed, and when the zoom lens is driven to the zoom end and the load on the operation ring 5 becomes excessive, the sleeve 15 idles with respect to the output gear 11 and the operation motor 5 The driving force transmitted to the motor is limited.

When the operation ring 5 is electrically operated, the intermediate gear 8 moves to the above-described state. When the operation ring 5 is manually operated, the clutch plate 9 is moved as shown in FIG. Rotation about the shaft 9a releases the engagement between the intermediate gear 8 and the output gear 11, and the transmission of the driving force of the drive motor 13 to the operation ring 5 is interrupted.

Here, as shown in a partially enlarged longitudinal sectional view of FIG. 5, a partially enlarged transverse sectional view of FIG. 6, and a partially enlarged plan view of FIG. 7, a lens drive having a zoom lens inside the fixed barrel 3 is shown. A lens drive system 21 is connected to the operation ring 5 via a pin 22. A substantially cylindrical elastic member 23 is provided on the inner peripheral surface of the operation ring 5 for the fastening member 2.
4, 25 or fixed with an adhesive or the like. The elastic member 23 is fixed to the operation ring 5 in a state where the expansion is adjusted by a jig or the like.

On the inner peripheral surface of the elastic member 23 and on the outer periphery of the fixed lens barrel 3, a substantially cylindrical load applying member 26 is provided so as to be displaceable in the circumferential direction and the optical axis direction. The load applying member 26 is switched to an electric operation state or a manual operation state by a switching knob to be described later, is displaceable in the electric operation state, and is fixed to the fixed lens barrel 3 in the manual operation state.

The inner peripheral surface of the elastic member 23 and the load applying member 26
The sliding contact portion 27 on the outer peripheral surface is pressed by a viscous fluid such as grease (not shown) so that a sliding resistance is generated in the sliding contact portion 27. The sliding contact resistance of the sliding contact portion 27 is
The sliding contact resistance between the load applying member 26 and the sliding contact portion 28 of the fixed lens barrel 3 is set larger.

The operation ring 5 to which the load is applied by the load applying member 26 is urged by the fixed ring 30 fixed to the fixed lens barrel 3 by the screw 29, and can be rotated without rattling. . As shown in the partial plan view of FIG. 8, a holding member 31 is provided on the outer periphery of the fixing ring 30, and a load adjusting knob 32 is attached to the holding member 31.

A pin 33 is provided on the bottom of the load adjusting knob 32.
The pin 33 is fitted into the groove 26 a of the load applying member 26 through an arc-shaped long hole 30 a formed in the fixing ring 30. The pin 33 is provided at an eccentric position of the load adjusting knob 32, and when the load adjusting knob 32 is rotated, the pin 33 moves in the optical axis direction to drive the load applying member 26 in the optical axis direction, and the elastic member The area of the sliding portion 27 of the load applying member 26 is changed.

On the surface of the holding member 31 around the load adjusting knob 32, a label 34 indicating "light" for reducing the load on the operation ring 5 and a label 34 for increasing the load on the operation ring 5 are provided. A label 35 indicating “heavy” and a scale 36 for separating between the labels 34 and 35 are affixed. The scale 36 is an index for displaying the degree of the load applied to the operation ring 5, and the load adjustment knob 3.
2 is rotated in the “light” direction, the area of the sliding contact portion 27 is reduced, the load on the operating ring 5 is reduced, and when the load adjustment knob 32 is rotated in the “heavy” direction, , Sliding part 27
And the load of the operation ring 5 increases.

As shown in the schematic diagram of FIG. 9, the load applying member 26 can be switched to an electric operation state or a manual operation state by a switching knob 40. An eccentric cam 41 is provided integrally with the switching knob 40, and the eccentric cam 41 is disposed in a hole 43 provided in the sliding plate 42. The sliding plate 42 is slidably supported by support plates 44 and 45, and a leaf spring 4 having both ends fixed to the sliding plate 42.
6 is urged to the load applying member 26 side. The sliding plate 42 is provided with substantially gears 42a, such as triangular teeth and knurls, which mesh with the teeth 26b of the load applying member 26.

Here, the elastic member 23 generates an even and reasonable elastic force, has resistance to aging, is excellent in oil resistance, and can absorb the unevenness of the outer peripheral surface to the load applying member 26 and can adhere thereto. For example, it is made of sponge rubber or the like, and is in contact with the load applying member 26 with an even and reasonable elastic force.

Further, the grease applied between the elastic member 23 and the load applying member 26 is a viscous fluid for generating an appropriate viscous resistance, and is caught on the operation ring 5 to give a feeling of looseness,
In addition to providing stability without dropping out, the operation ring 5 is given a load that makes the operation ring 5 feel light during low-speed rotation and heavy during high-speed rotation. The elastic member 23, the load applying member 26, and the grease allow the operation ring 5 to have the elastic member 23 and the load applying member 2.
A first load corresponding to the area of the sliding contact portion 27 of No. 6 is applied. On the other hand, an extremely small second load is applied to the sliding contact portion 28 between the fixed lens barrel 3 and the load applying member 26.

If a gap is provided between the elastic member 23 and the load applying member 26 so that they do not come into contact with each other, the operating ring 5 may be disengaged when operated, or the operational feeling is extremely poor. Or become. Conversely, the elastic member 23
When the inner diameter of the load applying member 26 is made smaller than the outer diameter of the load applying member 26 so that they come into strong contact with each other, frictional resistance is generated in addition to the viscous resistance due to the grease. There is a possibility that the operating feeling becomes stronger than the resistance and the operation feeling becomes dry. For this reason, the elastic member 23 and the load applying member 26 need to be evenly and lightly contacted.

The operating ring 5 of the optical lens barrel having such a configuration.
When the power supply is operated electrically, the switching knob 40 is switched to electric power. As a result, the clutch plate 9 of the drive unit 2 rotates to the right, the intermediate gear 8 moves, and its teeth 8a mesh with the teeth 5a of the operation ring 5. Further, the eccentric cam 41 rotates, and the sliding plate 42 moves to disengage the substantially gear 42a and the teeth 26b of the load applying member 26. As a result, the driving force from the driving motor 13 can be transmitted to the operation ring 5, and the load applying member 26 can be freely rotated. At this time, an extremely small second load is generated in the sliding contact portion 28 between the fixed lens barrel 3 and the load applying member 26.

In this state, when the driving force from the driving motor 13 is transmitted to the operation ring 5, the first load of the sliding member 27 between the elastic member 23 and the load applying member 26 is changed to the fixed lens barrel 3 and the load applying member 26. The operation ring 5 and the load applying member 26 are integrally rotated with respect to the fixed lens barrel 3 because the operation load 5 is larger than the second load of the sliding contact portion 28. At this time, since the load on the operation ring 5 is the second load, the operation ring 5 rotates with only a very small constant sliding resistance, and does not apply a large load to the drive motor 13.

Further, for example, when the lens drive system 21 moves to the end and the load on the operation ring 5 becomes a predetermined value or more, the torque limiter of the drive unit 2 is operated, and the sleeve 15 is moved to the output gear 11. And the teeth 5a of the operation ring 5 and the teeth 8a of the intermediate gear 8 do not break.

On the other hand, when the operation ring 5 is manually operated, the switching knob 40 is switched to the manual side. As a result, the clutch plate 9 of the drive unit 2 rotates to the left, and the teeth 8a of the intermediate gear 8 and the teeth 5a of the operation ring 5 are disengaged. Further, the eccentric cam 41 rotates, and the approximately gear 42 a of the sliding plate 42 meshes with the teeth 26 b of the load applying member 26. As a result, the driving force from the driving motor 13 is not transmitted to the operation ring 5 and the load applying member 26 is
Will not rotate.

When the operation ring 5 is manually operated in such a state, the operation ring 5 is moved by the elastic member 23 and the load applying member 2.
6 is rotated by the first load of the sliding contact portion 27. At this time, by rotating the load adjusting knob 32 between the “light” label 34 and the “heavy” label 35, the load applying member 2
6 moves in the optical axis direction, and the elastic member 23 and the load applying member 2
6, the area of the sliding contact portion 27 increases and decreases, and the viscous resistance of the grease changes according to the change in the area of the sliding contact portion 27, and the load on the operation ring 5 increases and decreases.

As described above, in the first embodiment, the fixed lens barrel 3
A load applying member which is displaced by sliding contact with both the fixed lens barrel 3 and the operation ring 5, and the operation ring 5 is provided on an inner peripheral surface thereof with an elastic member 23 which presses against the load applying member 26. And the elastic member 23 and the load applying member 2
6 is larger than the sliding resistance of the fixed barrel 3 and the sliding contact portion 28 of the load applying member 26, the load applying member 26 is moved in the optical axis direction, and By changing the area of 27, the load on the operation ring 5 can be set as desired. Therefore, the user likes the load on the operation ring 5 and can adjust the load according to the shooting target, the shooting environment, and the like. Further, the load on the operation ring 5 during the electric operation is only a very small constant sliding resistance of the sliding contact portion 28, so that the rotation speed of the operation ring 5 is improved and the power consumption of the drive motor 13 is reduced. be able to.

Further, since the elastic member 23 is brought into close contact with the load applying member 26, a desired load can be applied to the operation ring 5 immediately after the load applying member 26 is moved in the optical axis direction. Further, since the elastic member 23 and the load applying member 26 are brought into contact with each other without difficulty, it is possible to prevent the occurrence of a spike or the like at the time of starting the operation ring 5 and to connect the operation ring 5 to the elastic member 23 when the operation ring 5 is inverted. Good tracking can be achieved. Since the switching of the drive motor 13 and the switching of the load applying member 26 can be performed simultaneously by operating the switching knob 40, the operation can be simplified and malfunction can be prevented.

It should be noted that a click mechanism may be provided inside the load adjusting knob 32 to adjust the load in multiple stages.

FIG. 10 is a partially enlarged sectional view of a second embodiment of the optical lens barrel. An annular thin plate member 51 is provided between the elastic member 23 and the load applying member 26 in the first embodiment. The thin plate member 51 is provided so as to be in sliding contact with almost the entire outer peripheral surface of the outer peripheral surface of the operating ring 5.
25. Then, grease is applied to the sliding contact surface 52 of the thin plate member 51 and the load applying member 26, and a first load is applied to the sliding contact surface 52 by a sliding resistance which is a sum of a viscous resistance and a frictional resistance of the grease. ing.

In the second embodiment, the same effects as those of the first embodiment can be obtained. In addition, the provision of the thin plate member 51 makes it most suitable for the function of the pressing force generating portion and the sliding portion 52. The material and the shape can be freely selected, and the functionality and durability can be improved.

In the first and second embodiments, the elastic member 23 uniformly presses the outer peripheral surface of the load applying member 26. In the second embodiment, the thin plate member 51 presses the outer peripheral surface of the load applying member 26. The elastic member 23 and the thin plate member 51 are provided so as to cover almost the entire area of the inner periphery of the operation ring 5. However, the circumferential sliding area of the elastic member 23 and the thin plate member 51 is It can be set arbitrarily, for example, the elastic member 23
And the thin plate member 51 can be divided into several pieces in the circumferential direction, or can be formed so as to press an arbitrary angle range of the load applying member 26.

[0034]

As described above, in the optical lens barrel according to the present invention and the optical device using the lens barrel, the operating member has an elastic member on the inner peripheral surface side, and the lens barrel main body is viscous to the elastic member. Since the load applying member has a load applying member which is slidably displaceable through the fluid and applies a load to the operating member, the load of the operating member is reduced by displacing the load applying member to change the sliding contact area between the elastic member and the load applying member. Can be changed. Therefore, the load on the operating member can be set well during both the manual operation and the electric operation, and the load on the operating member can be set according to the preference of the operator during the manual operation.

Also, in comparison with the conventional structure in which the elastic member is fixed to the load applying member side and the outer peripheral surface of the elastic member and the inner peripheral surface of the operation member are in sliding contact with each other, the viscous fluid runs around or bleeds. The structure becomes difficult, and compactness becomes possible.

[Brief description of the drawings]

FIG. 1 is a side view in which a part of the first embodiment is cut away.

FIG. 2 is a rear view.

FIG. 3 is a partial cross-sectional view of a drive unit.

FIG. 4 is an explanatory diagram of an operation of the drive unit.

FIG. 5 is a partially enlarged longitudinal sectional view.

FIG. 6 is a partially enlarged cross-sectional view.

FIG. 7 is a partially enlarged plan view.

FIG. 8 is a partially enlarged plan view showing a load adjusting knob and its vicinity.

FIG. 9 is a schematic diagram of a switching knob.

FIG. 10 is a partially enlarged sectional view of the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shooting lens 2 Drive unit 3 Fixed lens barrel 5 Operation ring 9 Clutch plate 21 Lens drive system 23 Elastic member 26 Load applying member 31 Holding member 32 Load adjusting knob 33 Pin 34, 35, Label 36 Scale 40 Switching knob 51 Thin plate Element

Claims (7)

[Claims] 1. An optical lens barrel, wherein an optical member movably provided inside a lens barrel main body is driven by an operation member rotatably provided on an outer periphery of the lens barrel main body, wherein the operation member is on an inner peripheral surface side. An optical lens barrel, further comprising an elastic member, wherein the lens barrel main body includes a load applying member that slidably contacts the elastic member via a viscous fluid to apply a load to the operating member. 2. The optical lens barrel according to claim 1, wherein the operation member has a thin plate member that slides on an inner peripheral surface of the elastic member. 3. The optical barrel according to claim 1, further comprising a moving mechanism for moving the load applying member in an optical axis direction. 4. The optical mirror according to claim 3, further comprising a manual operation unit for manually operating the moving mechanism, and a load display unit for displaying a load on the operation member based on the operation of the manual operation unit. Tube. 5. A first load of the load applying member on the lens barrel main body is smaller than a second load of the operation member on the load applying member, and the load applying member can be displaced or cannot be displaced. The optical lens barrel according to any one of claims 1 to 4, further comprising a first switching mechanism for switching to a state. 6. An electric drive means for driving the operation member with electric power, a second switching mechanism for switching the operation member to a drivable state or a non-drivable state, the second switching mechanism, and the first switching mechanism. 6. The optical barrel according to claim 5, further comprising: an interlocking mechanism that interlocks the switching mechanism. 7. An optical device in which an optical member movably provided inside a lens barrel main body is driven by an operation member rotatably provided on an outer periphery of the lens barrel main body, wherein the operation member is provided on an inner peripheral surface side. An optical device having an elastic member, wherein the lens barrel body has a load applying member that slidably contacts the elastic member via a viscous fluid so as to apply a load to the operating member.