JPH01252911A - Lens moving device - Google Patents

Abstract

PURPOSE:To enable the execution of a focusing operation at stable torque without allowing helicoid threads to be deformed by engaging projecting parts of the number different from the number of the helicoid screw threads and the groove parts of an operating ring in various combination phases. CONSTITUTION:This device has the helicoid 28 which is provided integrally with a lens holding ring and consists of N-lines of the multiple threads, the operating ring 31 provided with the groove parts 35 which control the positions in the optical axis direction of the projecting parts 34 of the number different from the number N of the screw threads of the helicoid 28 by engaging with the projecting parts 34 in sliding contact therewith in the outside circumferential part of the lens holding ring, a coupling means which couples the operating ring 31 and the projecting parts 34 and a control means which controls the turning range of the ring 31. The lens position can be thereby set as desired and since strong force is not exerted to the helicoid screw part, the smooth turning of the focus operating ring is assured and the focusing function is surely executed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a lens moving device that is effective for use in video cameras and the like.

BACKGROUND OF THE INVENTION In recent years, video cameras and the like have been required to have an autofocus function that automatically adjusts the focus.

A conventional lens moving device will be explained using FIG. 4. FIG. 4 is a sectional view of the main part of the lens barrel. The cam frame 3 is rotatably supported inside the lens barrel body 1, and both ends are attached to the lens barrel body 1 and the lens barrel body 1. It is supported by the front frame 4 which is attached to the front frame 4, and its movement in the optical axis direction is regulated with a predetermined gap. The variable power lens frame 2 holds the variable power lens L3 by adhesive or the like, and has one end inserted into the lens barrel body 1 and the other end inserted into the front frame 4, and is guided by a supported guide ball 6 in the optical axis direction. Moving. The front frame 4Fi has a female helicoid screw 8t on the inner periphery of the front portion to be screwed together with the male helicoid screw 7 of the focus helicoid 6, and a protrusion 12 on the outer periphery that restricts the rotation of the focus ring 9 to a predetermined angle. The focus helicoid 6 is a focus lens group L1. L
Hold 2.

It has a male hemlock screw 7 that is screwed together with a female hemlock screw 8 of the front frame 4, and by rotating it around the optical axis opening, it moves in the optical axis direction and adjusts the focus. The focus ring 9 is fitted with the focus helicoid e, and is attached with screws 11, and the focus helicoid '6 is attached to the focus ring 9.
It rotates around the optical axis together with the front frame 4, and is regulated to a predetermined rotation angle by a protrusion 12 provided on the outer periphery of the front frame 4.

Note that the first focusing lens group L1. The distance between L2 and the variable magnification lens L3 must be adjusted after the lens unit is assembled in order to absorb variations due to lens processing accuracy and assembly errors, and the phase between the focus ring 9 and the focus ring and the recoid 6 must be adjusted. By doing this, the focusing lens groups L1, L
Adjust the distance between 2 and the variable magnification lens L3, and then 1. The one with AV is configured to tighten screw 11.

Also, a rubber ring 13 is provided on the outer periphery of the focus ring 9.
is wrapped around the screw to prevent the screw 11 from appearing on the outside. The zoom ring 14 is rotatably attached to the outer periphery of the lens barrel body 1 and rotates by a predetermined angle.

However, in the conventional configuration as described above, it is difficult to fix the focus recoid 6 and the focus ring 9 (because this installation requires screws 11). During installation, a huge force is applied to the focus helicoid 6 by tightening the screw 11 with V1 force, and the male helicoid screw 7f of the helicoid 6 is deformed, and the male helicoid screw 7 and the female of the 611 frame 4 The problem was that the engagement of the helicoid screw 8 became poor, and the focus helicoid 6 did not rotate smoothly.

The present invention solves the above-mentioned conventional drawbacks, and an object of the present invention is to provide a lens moving device that stabilizes the rotational torque of the focus recoid and reliably performs the autofocus function of a video camera, etc. .

Means for Solving the Problems In order to solve the above problems, the lens moving device of the present invention includes:
A lens retaining ring that holds the lens.

The lens retaining ring is integrally formed with a ``recoid'' consisting of N multi-thread screws, and a front sr: ``'' ! an operating ring having a number of protrusions corresponding to the number of screw strokes N and holes of the J'id, a groove that engages the protrusions in a slidable manner and fully regulates the position in the optical axis direction; The apparatus includes a coupling means for coupling the operating ring to the protrusion, and a regulating means for regulating the rotation range of the operating ring.

Effect With the above configuration, the position of the lens held by the lens holding ring can be arbitrarily set by engaging the protrusions of the number N of threads of the helicoid and the grooves of the operating ring in a divine combination phase. Since the operating ring is provided with a groove that engages with the protrusion and regulates the position in the optical axis direction, a force in the optical axis direction is applied to the operating ring. The bonding force that connects the ring and the protrusion can also be reduced, and the helicoid screw will not be deformed, making it possible to perform all focus operations with stable torque.

EXAMPLE Below, a lens moving device according to one embodiment of the present invention will be described with reference to the drawings. No. 11\1 shows a sectional view of a main part in an embodiment of the present invention. In addition, the center part of the figure below the dotted chain line is the katakari, meni, ni, which explains the operation.
The lens is shown in one state in which the entire optical axis direction is shifted by V/2.

In FIG. 1, the cam frame 21 is rotatably supported inside the main body 22, and the collar 211L of the cam frame 21 is attached to the main body 22.
By being inserted into the front frame 23, the position in the direction of the optical axis 24 is regulated. Variable magnification lens frame 25VCVi variable magnification L/
7zu L4. Lt5 holds gn, and one end is attached to main body 221C
The other end is inserted into the front frame 23VC and guided by the supported guide ball 26, and the pin 27 implanted in the variable power lens frame 26 is inserted into the cam groove 21b'1 of the cam frame 21. It is driven and moved in the direction of the optical axis 24.

The front frame 23 has a female helical coid screw 30 on the inner periphery of the front portion, which is screwed into the male recoid screw 29 of the 74-casu refid, and on the outer periphery, the rotation of the focus ring 31 is restricted to a predetermined circumferential angle. A stopper 32 is provided.

Male helicoid screw 29 and 7 helicoid screw 3
0ba 6-row multi-row 7. 2, and each other's screw part'tr
i 6 Turning E 11 The current alignment phase is configured so that E is possible.

Further, a rubber 32b is wound around the stopper 32 to reduce noise when the protruding portion 31b of the focus ring 31 is brought into contact with the stopper 32 to regulate the end of rotation.

Focusing lens 281d, focusing lens group L1゜I
, 2. L3 is held by caulking and a clip spring 33, and has six protrusions 34 on the outer periphery that fit into the inner periphery 311L of the focus ring 31.

The focus ring 31, which is positioned in the direction of the optical axis 24 by the rear end surface 34a of the protrusion 34 and the front end surface 2a& of the focus helicoid 28, has a shape corresponding to the number of protrusions 34, as shown in the plan view of the main part in FIG. It has five grooves 36. At the end of the groove 36 there is a width l of the protrusion 34, a larger width 1
By inserting the protrusion 34 of the focus recoil 28 into the notch 36 and moving it in the direction of the arrow 37, the protrusion 34ft groove 36 is provided.
to be slidably engaged with.

FIG. 3 is a perspective view of the main part showing the groove 36.

The focus ring 31 has a wall 38 that can come into sliding contact with the rear end surface 34 & of the protrusion 34 . As shown in FIG. 1, the focus ring 31 has a distal end/zoom ring integrally formed therein, and this part can be rotated to perform manual focus operation, or a gear part 40 at the rear end of the focus ring 31 can be rotated. An autofocus operation is performed by driving the motor 41.

An adhesive film tape 42 is wound around the protrusion 34 of the focus helicoid 28 and the soil of the focus ring 31, and fixes the focus helicoid 28 and the focus ring 31 integrally. cover ring 43
is wrapped around the film tape 42 so that the film tape 42 is not exposed. The zoom ring 44 is guided and attached to the front frame 23 and the main body 22 so as to be able to rotate once, and rotates by a predetermined angle to drive the cam frame 21 and move the variable magnification lens L4. It is configured to move Ls in the direction of the optical axis 24 to perform a magnification changing operation.

The operation of the lens moving device configured as described above will be explained below.

Focusing lens group L1. L2. By screwing the male helicoid screw 29 of the focus helicoid 28 holding L3 into the female helicoid screw 28 of the front frame 23 and inserting the protrusion 34ft of the focus helicoid 28 into the groove 35 of the focus ring 31, the outer periphery of the focus helicoid 28 is fixed. Assemble the focus ring 31'i. Next, with the protrusion 31b of the focus ring 31 in contact with the stopper 32, move only the focus helicoid 28 to the optical axis 2.
The focusing lens groups L1, L2 . L3 is moved in the direction of the optical axis 24, and focusing lens groups Ll, L2 . L
Adjust the position of 3.

Here, if the number of screw threads of the male hemlockoid screw 29 and the female hemlockoid screw 30 is 6, and the number of protrusions 34 is 6, the focus is relatively the same even if the combination phase is changed. With the protrusion 31b of the ring 31 in contact with the stopper 32, the focusing lens group L1. L2
．． To set L3 at any position, use the protrusion 34 and groove 3.
Although it is necessary to widen the sliding adjustment range with 5, the protrusion 34
The relative position can be adjusted by changing the number of screw threads to 6 and varying the phase by the combination of the male helicoid screw 29 and the female helicoid screw 3o and the combination of the protrusion 34 and the groove 36. Changed protrusion 34 and groove 36
Even if the sliding adjustment range of L1. L2.
The position of L3 can be set arbitrarily.

Furthermore, one of the five protrusions 34 has a groove-shaped phase mark 341L for indicating the phase.

As described above, focusing lens group L1. L2. After adjusting the position of L3, move the film tape 42 to the focus helicoid 2.
The focus ring 31 is fixed integrally with the focus helicoid 28 by winding it around the soil of the protrusion 34 of No.8.

As described above, the focusing lens can be set at a certain position by various combinations of the phase of the helicoid screw and the phase of the projection and groove, and the projection 34 of the focus helicoid 28 and the groove 36 of the focus link 31 are soil that is movably engaged and conditioned.

Focus Helicoid 2 using Film Chi-142
8 and the focus ring 31, a large force is not applied to the helicoid threaded portion, and deformation of the helicoid threaded portion can be prevented and one rotation can be maintained smoothly.

Effects of the Invention As described above, the present invention includes a lens holding ring for holding a lens, a helicoid formed integrally with the lens holding ring and consisting of an N threaded threaded screw, and a helicoid provided protrudingly on the outer periphery of the lens holding ring. an operating ring having a number of protrusions different from the number of threads N of the recoid, and a groove that slidably engages with the protrusions and regulates the position in the optical axis direction; The provision of the coupling means for coupling the operation ring and the protrusion, and the regulation means for regulating the rotation range of the operation ring makes it possible to set the lens position to any desired position at l:9. Since strong force is not applied to the helicoid threaded portion VC, the helicoid threaded portion does not deform, and the rotation of the focus operation ring can be made smooth, allowing the autofocus function 5c to be performed reliably. Since the position in the optical axis direction is regulated by the mechanism 1iK in which the portion and the groove engage with each other, the number of parts is small and assembly and adjustment can be easily performed, which has great effects.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of main parts of a lens moving device according to an embodiment of the present invention, Fig. 2 is a cliff view of main parts of the same device, Fig. 3 is a perspective view of main parts of the same device, and Fig. 4 is a sectional view of a main part of a conventional lens moving device. 23...Front frame, 2S...Focus helicoid. 29...male helicoid screw, 30...
・Female edge helicoid screw, 31...F4・-cush ring, 32...St, y: =, 34・
...Protrusion, 35...Groove, 42...
・Film tape. Name of agent: Toshio Nakao, Toshio Nakao, and 1 other person
Figure 3 Figure 4

Claims (1)

[Claims] a lens holding ring that holds a lens; a helicoid formed integrally with the lens holding ring and consisting of N multi-thread threads; and a helicoid provided protruding from the outer periphery of the lens holding ring and having a number of thread threads different from the number N of the helicoid. an operating ring provided with a groove that slidably engages with the protrusion to regulate the position in the optical axis direction; a coupling means for coupling the operating ring and the protrusion; A lens moving device comprising a regulating means for regulating a rotation range of a ring.