JPH04104613U - power zoom lens barrel - Google Patents

Abstract

(57) [Abstract] [Objective] The objective is to provide a zoom lens barrel that can switch between power zooming and manual zooming with a simple mechanism. [Structure] A surface wave motor and two urging members with different urging forces are provided. During manual zooming, the surface wave motor fixed body is free to rotate from the fixed cylinder, and the surface wave motor moving body rotates integrally with the surface wave motor fixed body to perform zooming. During power zooming, the surface wave motor fixed body is fixed. It is fixed to the cylinder and cannot rotate, and when power is supplied, the surface wave motor fixed body drives and rotates the surface wave motor moving body, and the surface wave motor moving body integrally rotates the cam ring to perform zooming. Do as I please. [Effect] There is no need to provide a mechanical switching clutch or the like.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a power zoom lens barrel. For more details, please refer to the shooting record. Power zoom using a surface wave motor as the drive source for power zooming the lens This relates to a lens barrel.

0002

[Conventional technology]

In recent years, zoom lens barrels have adopted electrical power zooming. There are many examples where it is used. Also, switch to manual zoom for fine adjustment. I was making adjustments. Therefore, switch between power zooming and manual zooming. It was equipped with a switching clutch, etc.

0003

[Problem that the idea aims to solve]

As mentioned above, with conventional technology, power zooming and manual zooming cannot be separated. It is necessary to provide a switching clutch etc., which makes the mechanism complicated, The lens barrel was large and therefore not easy to use. This invention was devised in view of the conventional problems as mentioned above, and uses a surface wave motor. Mechanically simple and easy to switch between power zooming and manual zooming. Accordingly, an object of the present invention is to provide a zoom lens barrel that is easy to use.

0004

[Means to solve the problem]

In order to solve the problem, this invention uses zooming lenses (L1, L2) and a fixed barrel (1). , a lens holding tube (2) that holds the zooming lenses (L1, L2), and a manifold. Zooming operation ring (7) for manual zooming and manual zooming switching means (3) for switching between operation and power zooming operation; Rotate around the optical axis and move the lens holding cylinder (2) in the optical axis direction by A cam ring (10), a surface wave motor fixing body (5) that fits into the fixing cylinder (1), and A surface wave motor is provided rotatably around the optical axis in contact with the surface wave motor fixed body (5). In a zooming lens barrel having a surface wave motor including a motor moving body (11), The surface wave motor fixed body (5) rotates around the optical axis together with the zooming operation ring (7). The cam ring (10) is integrally engaged with the surface wave motor moving body (11) and The surface wave motor fixing body (5) is rotatably engaged around the axis, and the optical axis is attached to the fixing tube (1). a first biasing member (6) that presses the surface wave motor moving body in the direction of the surface wave motor; a second biasing member (15) that presses the data fixing body (5) in a direction toward the optical axis; The surface wave motor fixing body (5) is pressed against the fixing cylinder (1) by the urging member (6) of No. 1. Torque due to the generated frictional force is applied to the surface wave motor by the second biasing member (15). Torque due to frictional force generated by pressing the moving body (11) against the surface wave motor fixed body (5) The biasing forces of the first biasing member (6) and the second biasing member (15) are greater than The power zoom lens barrel has been configured. Further, the cam ring (10) and the surface wave motor moving body (11) are integrally arranged around the optical axis. A power zoom lens mirror that is integrally formed instead of rotatably engaged with the Constructed a cylinder.

[0005]

[Effect]

Due to the difference in the biasing forces of the two biasing members, the surface wave motor is not activated during manual zooming. The motor fixed body is free to rotate from the fixed tube, and the surface wave motor moving body is attached to the surface wave motor fixed body. Zooming is performed by rotating integrally with the fixed object. Also, during power zooming, the surface wave motor fixed body is fixed to the fixed tube. The surface wave motor fixed body cannot be rotated and the surface wave motor moves when power is supplied. Driving and rotating the body. The surface wave motor moving body rotates the cam ring integrally and zooms. The process will be carried out. Switching between power zooming and manual zooming is performed electrically.

[0006]

【Example】

An embodiment according to the present invention will be explained with reference to FIG. FIG. 1 is a sectional view of the embodiment. The optical system includes a first lens group L1 and a second lens group L2 that perform zooming, which are fixed. It is composed of a third lens group L3. The fixed barrel 1 has a first lens group L1 and a second lens group L2 on the inner circumference of the medium diameter portion 1a. A lens holding cylinder 2 which is held and fixed is fitted and held. The fixed body 5 of the surface wave motor has an optical axis centered on the outer periphery of the minimum diameter portion 1b of the fixed cylinder 1. The corrugated plate spring 6 applies a predetermined load torque. The contact surface 5b of the fixed body 5 is pressed against the contact surface 1i of the fixed cylinder 1 in the optical axis direction.

[0007] The manual zoom ring 7 is located around the optical axis on the outer periphery of the large diameter portion 1c of the fixed barrel 1. It is fitted so that it can rotate only at a fixed angle, and is perpendicular to the optical axis of the manual zoom ring 7. The groove 7b provided in the protrusion 7a extending in the direction and the outside of the fixed body 5 of the surface wave motor The manual zoom ring 7 is engaged with the protrusion 5a provided on the periphery. and the fixed body 5 are configured to rotate integrally. A pin 8 is implanted on the outer periphery of the lens holding tube 2, and a pin 8 is installed on the fixed tube 1. It passes through the guide groove 1d parallel to the optical axis and fits into the outer periphery of the small diameter portion 1a of the fixed tube 1. The tip end of the cam ring 10 is fitted into the cam groove 10a of the cam ring 10 being held. The cam ring 10 is fitted and held on the outer periphery of the middle diameter portion 1a of the fixed cylinder 1. medium diameter The tip of the pin 12 implanted on the outer periphery of the portion 1a is installed on the inner periphery of the cam ring 10. Since the cam ring 10 is engaged with the circumferential groove 10b, the cam ring 10 is moved in the optical axis direction. It does not move and only rotates at a predetermined angle. Also, the right end of the cam ring 10 has a rear A protrusion 10c that engages with the engagement groove 11a of the movable body 11 described above is provided, and the cam ring 10 and the movable body 11 are configured to rotate integrally around the optical axis.

[0008] The moving body 11 rotates with respect to the fixed body 5 via ball bearings 13a and 13b. freely held. The fixed body 5 forms a U-shape with the movable body 11 in the optical axis direction. ing. A biasing member 15 is provided in contact with the contact surface 5c on the left side in the figure, and the disc 1 4. The movable body 11 is fixed at the contact surface 11c via the ball bearing 13b. It is brought into frictional contact with the contact surface 5d on the right side in the figure of 5. In other words, a control mechanism (not shown) The fixed body 5, movable body 11, biasing member 15, disc 14, ball bearing When power is supplied to the surface wave motor consisting of 13a and 13b, the surface wave motor 13a and 13b causes surface wave movement on the fixed body 5. A row wave is generated and the moving body 11 rotates. In addition, the friction torque between the fixed body 5 and the fixed cylinder 1 generated by the biasing of the waveform leaf spring 6 is calculated from the friction torque between the movable body 11 and the fixed body 5 generated by the biasing member 15. It is set large. Switch button 3 is a button to switch between manual zooming and power zooming. It is.

[0009] Next, the operation will be explained. When performing manual zoom, press switch button 3. power supply to the fixed body 5 is turned off. and manual zoom ring Rotate 7 manually. When the manual zoom ring 7 rotates, the manual A groove 7 provided in a protrusion 7a extending perpendicularly to the optical axis of the zoom ring 7 b are engaged with the protrusion 5a provided on the outer periphery of the fixed body 5 of the surface wave motor. Then, the fixed body 5 rotates integrally with the manual zoom ring 7. Fixed with disk 14 A biasing member 15 is provided between the body 5 and the disc 14 and the ball bearing 1. Since the fixed body 5 and the movable body 11 are in frictional contact via 3a and 13b, the fixed body When 5 rotates, the moving body 11 rotates integrally. The engagement groove 11a of the movable body 11 and the cover Since the protrusions 10c of the mulling 10 are engaged with each other, the rotation of the movable body 11 The cam ring 10 rotates together. and is implanted on the outer periphery of the lens holding tube 2. The pin 8 passes through a guide groove 1d parallel to the optical axis provided in the fixed barrel 1, and is attached to the cam ring. 10, the lens holding tube 2 is engaged with the cam groove 10a provided in the cam groove 10. a along the optical axis while rotating by a predetermined amount.

0010 When power zooming, press the switch button 3 to supply power to the fixed body 5. do. A control mechanism (not shown) controls the fixed body 5, movable body 11, biased member 15, and disk. 14. Power is supplied to the surface wave motor consisting of ball bearings 13a and 13b. When the waveform plate spring 6 is biased, a surface traveling wave is generated on the fixed body 5, and the fixed body is The friction torque with cylinder 1 is set to be larger than the generated torque of the surface wave motor. In this case, the fixed body 5 does not rotate, and only the movable body 11 rotates. When the moving body 11 rotates, The engagement groove 11a of the movable body 11 and the protrusion 10c of the cam ring 10 are engaged with each other. Therefore, the cam ring 10 rotates together with the rotation of the moving body 11. and ren The pin 8 planted on the outer periphery of the lens holding tube 2 is connected to a pin parallel to the optical axis provided on the fixed tube 1. This is because it passes through the inner groove 1d and engages with the cam groove 10a provided in the cam ring 10. , the lens holding tube 2 is moved along the cam groove 10a by a predetermined amount along the optical axis without rotating. power zooming is performed.

[0011] A second embodiment according to the present invention will be explained with reference to FIG. FIG. 2 is a sectional view. Description of points that are the same as or similar to the first embodiment will be omitted. The second embodiment is based on the first example. Whereas the embodiment has the cam ring 10 and the moving body 11 separately, The difference from the first embodiment is that the cam ring 10 and the movable body 11 are integrally formed. do. A pin 8 is implanted on the outer periphery of the lens holding tube 2, and a pin 8 is installed on the fixed tube 1. It passes through the guide groove 1d parallel to the optical axis and fits into the outer periphery of the small diameter portion 1a of the fixed tube 1. The leading end of the movable body 11 is fitted into the cam groove 10a of the movable body 11 being held.

0012 The movable body 11 is fitted and held on the outer periphery of the medium diameter portion 1a of the fixed cylinder 1. Medium diameter part 1 The tip of the pin 12 implanted on the outer periphery of 0a is installed on the inner periphery of the movable body 11. Since the movable body 11 is engaged with the circumferential groove 10b, the moving body 11 does not move in the optical axis direction and remains Only the angle can be rotated. Also, the ball bearing 13 is connected to the fixed body 5. It is rotatably held via a and 13b. The fixed body 5 holds the movable body 11 in the direction of the optical axis. It forms a U-shape by sandwiching it in both directions. The biasing member 15 is in contact with the contact surface 5c on the left side in the figure. The movable body 1 is provided through the disc 14 and the ball bearings 13a and 13b. 1 is brought into frictional contact with the contact surface 5d on the right side in the figure of the fixed body 5 at the contact surface 11c. Ru. That is, the fixed body 5, the movable body 11, and the biasing member 1 are controlled by a control mechanism (not shown). 5. Power is supplied to a surface wave motor consisting of a disc 14 and a ball bearing 13. Then, a surface traveling wave is generated in the fixed body 5, and the movable body 11 rotates. In addition, the friction torque between the fixed body 5 and the fixed cylinder 1 generated by the biasing of the waveform leaf spring 6 is calculated from the friction torque between the movable body 11 and the fixed body 5 generated by the biasing member 15. It is set large.

[0013] Next, the operation will be explained. When performing manual zoom, press switch button 3. and the power supply to the fixed body 5 is cut off. and manual zoom ring Rotate 7 manually. When the manual zoom ring 7 rotates, the manual A groove 7 provided in a protrusion 7a extending perpendicularly to the optical axis of the zoom ring 7 b are engaged with the protrusion 5a provided on the outer periphery of the fixed body 5 of the surface wave motor. Then, the fixed body 5 rotates integrally with the manual zoom ring 7. Fixed with disk 14 A biasing member 15 is provided between the body 5 and the disc 14 and the ball bearing 1. Since the fixed body 5 and the movable body 11 are in frictional contact via 3a and 13b, the fixed body When 5 rotates, the moving body 11 rotates integrally. The engagement groove 11a of the movable body 11 and the cover Since the protrusions 10c of the mulling 10 are engaged with each other, the rotation of the movable body 11 The cam ring 10 rotates together. and is implanted on the outer periphery of the lens holding tube 2. The pin 8 passes through a guide groove 1d provided in the fixed barrel 1 and is parallel to the optical axis, and is attached to the movable body 11. Since the lens holding tube 2 is engaged with the cam groove 10a provided in the cam groove 10a, along the optical axis by a predetermined amount while rotating.

[0014] When power zooming, press the switch button 3 to supply power to the fixed body 5. do. A control mechanism (not shown) controls the fixed body 5, movable body 11, biasing member 15, and disk. 14. Power is supplied to the surface wave motor consisting of ball bearings 13a and 13b. When the waveform plate spring 6 is biased, a surface traveling wave is generated on the fixed body 5, and the fixed body is The friction torque with cylinder 1 is set to be larger than the generated torque of the surface wave motor. In this case, the fixed body 5 does not rotate, and only the movable body 11 rotates. When the moving body 11 rotates, The engagement groove 11a of the movable body 11 and the protrusion 10c of the cam ring 10 are engaged with each other. Therefore, the cam ring 10 rotates together with the rotation of the moving body 11. and ren The pin 8 planted on the outer periphery of the lens holding tube 2 is connected to a pin parallel to the optical axis provided on the fixed tube 1. It penetrates through the inner groove 1d and engages with the cam groove 10a provided on the movable body 11. The lens holding cylinder 2 moves a predetermined amount along the optical axis while rotating along the cam groove 10a. Power zooming is performed.

[0015] To switch between power zooming and manual zooming, press switch button 3. However, the rotation of the manual zoom ring is used as an electrical signal to turn the power supply 0N/0F. Needless to say, it can be F. Also, it depends on whether or not power is supplied to the surface wave motor, which is the drive source for power zooming. You can switch between power zooming and manual zooming. Clutches that have the action of a mechanical switch can be used as long as there is an electric switch for switching. does not require.

[0016] As explained above, during manual zooming, as the zoom ring 7 rotates, The rotating body 5 rotates, and is frictionally coupled to the rotating body 5 by the biasing member 15. Since the moving body 11 is rotated, the cam ring 1 engaged with the moving body 11 is 0 rotation (in the second embodiment, the rotation of the movable body 11 due to the rotation of the fixed body 5), The desired manual zooming operation is achieved. On the other hand, during power zooming, the moving object is Rotate 11. At this time, due to the action of the wave spring 6, as the moving body 11 rotates, Since the rotation of the rotating body 5 is suppressed, it does not affect the manual zooming operation in any way. There's nothing to do. The influence here refers to the power zoom when using a zoom ring with coarse movement. You can perform fine adjustments by switching to manual zooming. At this time, mechanical Since no special switching clutch is required, the camera can smoothly shift to shooting operation.

[0017]

[Effect of the idea]

Due to the difference in the biasing forces of the two biasing members, the surface wave motor fixed body is moved against the fixed cylinder. It can rotate freely during manual zooming, and cannot rotate when using power zooming. Since switching is performed electrically, it is necessary to provide a mechanical switching clutch, etc. A motor with a simple and compact structure, no noise from clutches, etc. A mulens lens barrel is provided.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a first embodiment.

FIG. 2 is a sectional view of a second embodiment.

[Explanation of symbols]

1...Fixed cylinder 1i...Contact surface 2... Lens holding tube 3...Switch button 5...Fixed body 5a...Protrusion 5b, 5c, 5d...contact surface 6...Corrugated leaf spring 7...Zoom ring 7b...Groove 8... pin 10...cam ring 11... moving object 11c...Contact surface 12...pin 13a, 13b...Ball bearings 14...disk 15...Biasing member

Claims (2)

[Scope of utility model registration request] 1. A zooming lens, a fixed barrel, a lens holding barrel that holds the zooming lens, a zooming operation ring that performs a manual zooming operation, and a switching means that switches between a manual zooming operation and a power zooming operation. a cam ring that rotates around the optical axis and moves the lens holding cylinder in the optical axis direction by a zooming operation;
A zooming lens barrel having a surface wave motor including a surface wave motor fixed body that fits into the fixed tube and a surface wave motor moving body that is rotatably provided around an optical axis in contact with the surface wave motor fixed body. In the above, the surface wave motor fixed body is integrally engaged with the zooming operation ring so as to be rotatable around the optical axis, and the cam ring is integrally engaged with the surface wave motor moving body so as to be rotatable around the optical axis. a first urging member that presses the surface wave motor fixed body against the fixed tube in the direction of the optical axis; and a second urging member that presses the surface wave motor moving body against the surface wave motor fixed body in the direction of the optical axis.
The first urging member presses the surface wave motor fixed body against the fixed cylinder, and the torque due to the frictional force is applied to the surface wave motor moving body by the second urging member. A power zoom lens barrel characterized in that the biasing forces of the first biasing member and the second biasing member are set to be larger than the torque due to the frictional force generated by pressing against the wave motor fixed body. 2. Claim (1), characterized in that the cam ring and the surface wave motor moving body are integrally formed instead of being integrally engaged to be rotatable about the optical axis. power zoom lens barrel.