JPS63137204A - Lens barrel for driving automatic and manual lens - Google Patents

Abstract

PURPOSE:To fix an ultrasonic motor and drive a manual lens by providing an automatic driving cylinder which engages the rotor of the ultrasonic motor and supplies a turning force to a lens frame and a manual driving cylinder which engages the lens frame and is rotated by a manual force. CONSTITUTION:When the ultrasonic motor 1 operates and a rotor cylinder 4d rotates around an optical axis, the automatic driving cylinder 8 coupled with it rotates and the turning force by helicoid coupling is converted into a linear driving force by a straight key 10a and a key groove 9a and the lens frame 9 moves in the directions of the optical axis to perform focus adjustment or zooming operation. When a distance ring 11 is slid as shown by an arrow A to engage a pin engagement part 11b with the pin 10b and the distance ring 11 is rotated around the axis, the lens frame 9 is pushed to its straight groove 10b by the rotation of the driving cylinder 10 because neither a rotor 4 nor the driving cylinder 8 rotates, so that the lens frame 9 is driven linearly in the optical-axis directions. Thus, automatic lens driving is performed, manual lens driving is also enabled while the ultrasonic motor is fixed, and the driving force is reducible.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to automatic and manual lens drive lens barrels driven by motors, particularly ultrasonic motors, and manually.

``Prior art'' A lens barrel that drives a lens manually or by an ultrasonic motor has a configuration in which a barrel driven manually rotates when driven by the motor, and a motor rotates when driven manually. something is proposed.

``Problems to be Solved by the Invention'' However, the system in which the motor rotates often has problems such as the motor holding mechanism, wiring mechanism, etc. becoming complicated.

``Means for Solving the Problems'' The present invention aims to provide an automatic and manual lens drive lens barrel with a simple configuration, an ultrasonic motor, and a rotor of the ultrasonic motor that engages with the lens frame. A lens frame that engages with this automatic drive barrel; A manual drive barrel that engages with this lens frame and is rotated by manual force such as a distance ring; and these automatic drive barrels. and a mechanism for converting the rotational force of the manual drive barrel into linear drive force in the optical axis direction of the lens frame.

"Operation" According to the configuration of the present invention, the lens frame can be moved in the optical axis direction to adjust the focus of the lens either by motor or manually, and in the case of manual operation, the motor part is maintained in a fixed state. .

"Embodiment" FIGS. 1 to 4 show embodiments of the present invention, FIG. 1 is a first embodiment of the present invention, FIG. 2 is a schematic diagram showing the second embodiment, and FIG. 3 is a schematic diagram showing the second embodiment. The main components of the ultrasonic motor used in the present invention, FIG. 4 is a schematic diagram showing the engaging portions of the rotor cylinder and the automatic drive cylinder, respectively. In each figure, the same members are given the same reference numerals.

First, the configuration of the ultrasonic motor used in the present invention will be explained using FIGS. 3 and 4. Figure 3 shows ultrasonic motor 1
2 is a cylindrical housing made of a rigid body,
A stator 3 is composed of a buffer material 3a, a piezoelectric body 3b, and a vibrating body 3C, and is fixed to the housing 2 via a buffer material 3a.

Reference numeral 4 denotes a rotor, which includes a rotating body 4a, a lining 4b fixed to the rotor, and a donut-shaped disk 4C made of an elastic body such as a corrugated leaf spring or a rubber plate provided in contact with the rotating body 4a.
and a rotor cylinder 4d, and these 4a to 4d are each fixedly installed. 5 is a washer, 6 is a thrust washer, and 7 is an inner cover, which is threadedly engaged with the threaded portion 2a of the housing. The stator 3 and the rotor 4 are pressed against each other by an appropriate pressure through the inner cover 7.

The pressure is determined by the amount of screw engagement between the threaded portion 2a of the housing 2 and the threaded portion 7a of the inner cover 7, and after the pressure is adjusted, they are fixed with screws or adhesive (not shown). As is generally known, the basic operation of the ultrasonic motor shown here is that the vibrating body 3C is excited by the traveling wave vibration generated in the piezoelectric body 3b, which rotates the rotor 4 that is pressed into contact with it. Ru.

FIG. 1 shows an automatic and manual lens drive lens barrel that applies the basic configuration of the ultrasonic motor shown in FIG. In this case, the housing has both a bayonet mount 2b and a bayonet claw 2c. 3 is a stator of the ultrasonic motor 1, 4 is a rotor, and 4d is a rotor cylinder. 8 is an automatically driven cylinder that is engaged with the rotor cylinder 4d at one or several fitting parts 8a on the circumference and is rotated by the rotor cylinder 4d. As shown in the figure.

It is clear that the convex portions and concave portions in FIG. 4 may be reversed. Reference numeral 9 denotes a lens frame, which adjusts the focus of the photographic lens by moving in the direction of the optical axis. Obviously, this may also be zooming. The automatic drive cylinder 8 and the frame 9 are connected to each other by a helicoid connection at a connecting portion 8b, so that rotational force is transmitted to each other. The angle between the helicoid and the optical axis is set appropriately. 1° is a manually driven cylinder which is rotated by manual force, and is connected to the lens frame 9 by a linear key 10b and a keyway 9a. Reference numeral 10b denotes a pin implanted in the manual drive tube, which in the illustrated state idles in the groove 11a on the circumference. 11 is a distance ring. This could be a zoom ring. llb
is a pin retaining portion, which engages with the pin 10b when the distance ring II is slid in the direction of arrow A, and the distance ring 11 and the manual drive cylinder rotate together. Note that 12 is a step-up transformer as a power source for driving the ultrasonic motor. By providing this transformer within the lens barrel, the adverse effects of high voltage are reduced.

Next, the operation of the embodiment shown in FIG. 1 will be explained.

Automatic lens drive operates as follows. That is, when the ultrasonic motor 1 operates and the rotor cylinder 4 rotates around the optical axis, the automatic drive cylinder 8 connected thereto rotates, and this rotational force due to the helicoid coupling is applied to the linear key 10a and the key. The lens frame 9 is converted into a linear driving force by the groove 9a, and the lens frame 9 is moved in the optical axis direction, thereby performing focus adjustment or zooming.

Next, manual lens driving will be explained. By sliding the distance ring 11 in the direction of arrow A, the pin engaging portion 11b and the pin 10
When b is engaged and the distance ring 11 is rotated around the optical axis,
Since the rotor 4 of the ultrasonic motor and the automatic drive tube 8 do not rotate, the lens frame 9 is driven linearly in the optical axis direction by rotation of the manual drive tube 10 and pushed by the linear key.

FIG. 2 shows a second embodiment of the present invention, and the explanation of the same parts as in FIG. 1 will be omitted, and only the different parts will be explained. While the embodiment shown in FIG. 1 uses a helicoid connection, this embodiment differs only in that it uses a cam groove and a pin. In the figure, 9b is a pin implanted in the lens frame 9;
The IOC is an elongated cam groove formed in the manual drive cylinder and having an appropriate angle with respect to the optical axis direction. In the case of automatic drive, the pin 9b and cam groove 10G are rotated by the automatic drive cylinder 8.
This rotational force due to the engagement of the linear key 10a and the keyway 9a
This converts the force into a linear driving force and moves the lens frame 9 in the optical axis direction. In the case of manual drive, when the manual drive barrel 10 rotates, this rotational force due to the engagement between the cam groove 10C and the pin 9b is converted into a linear driving force by the linear key 10a and the keyway 9a, and the lens frame 9 is moved in the optical axis direction. Move to.

[Effects of the Invention] According to the present invention, the ultrasonic motor remains fixed even when driving the lens manually, so the configuration is simple and the torque can be small.

[Brief explanation of the drawing]

1 to 4 show embodiments of the present invention, FIG. 1 is a schematic diagram showing a first embodiment of the present invention, FIG. 2 is a schematic diagram showing a second embodiment, and FIG. 3 is a schematic diagram showing a second embodiment of the present invention. FIG. 4 is a diagram showing the main configuration of the ultrasonic motor used, and is a schematic diagram showing the engagement portion between the rotor cylinder and the automatic drive cylinder. 1... Ultrasonic motor 2... Housing 3...
・Stator 4...4 rotors...Rotor tube 8...Automatic drive tube 9...Lens frame
10...Manual drive tube 11...Distance ring

Claims (1)

[Claims] A cylindrical ultrasonic motor having a stator having a piezoelectric body and an elastic body, a rotor that frictionally engages with the stator, and an automatic drive tube that engages with the rotor and drives a lens frame by a helicoid, a cam groove, or a pin mechanism. , a focusing lens frame having a key groove or a linear key that engages with the automatic drive cylinder through a helicoid, pin or cam groove and converts rotational force into a linear force; and a lens frame that engages with the lens frame through a linear key or key groove. An automatic and manual lens drive lens barrel using an ultrasonic motor, characterized in that it is composed of a manual drive barrel that is rotated by a manual force.