JPS6247015A - Device for moving lens and diaphragm by motor - Google Patents

Abstract

PURPOSE:To control the movement of a lens barrel and the diaphragm setting operation of a diaphragm mechanism by rotating a rotor forward and reverse and transmitting the rotating force to the lens barrel through the first and second screw parts, etc. with the overall extent of movement of a diaphragm driving member of the diaphragm mechanism as play. CONSTITUTION:When a motor is driven to generate a driving force in a rotor 3, the driving force is transmitted to a lens barrel 6 and a diaphragm mechanism 9 through the first and second screw parts 5 and 8. Consequently, a diaphragm driving member 10 of the diaphragm mechanism 9 is rotated in the direction of an arrow A to reach a left end part 12a of a moving groove 12, and the lens barrel 6 itself starts to move along the optical axis. When the rotor 3 is reversed, the driving force is transmitted to the diaphragm driving member 10 of the diaphragm mechanism 9 through the screw part of othe lens barrel 6, etc. The diaphragm mechanism 9 is rotated in the direction of an arrow B, and consequently, a projecting pin 11 functions as as fulcrum to move the diaphragm driving member 10 to a right end part 12b of the moving groove 12 when this operation is viewed with the diaphragm driving member 10, which is connected to the projection pin 11 stuck to a stator 1, as the center. Thus, the rotor 3 is rotated forward and reverse to control moving operations of a lens 7 and aperture blades 9a to desired positions.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a device for moving a lens and an aperture in an optical lens device used in a photographic camera, and more particularly, to a device for moving both the lens and an aperture using one motor. It is characterized by being driven.

2. Description of the Related Art Various types of moving devices using motors as drive sources for controlling the movement of lenses and apertures in optical lens devices such as photographic cameras have been known.

For example, if the lens is driven by a motor,
There is Japanese Patent Application Laid-Open No. 69-42506, etc., and Japanese Patent Application Laid-Open No. 57-165 discloses a device in which the aperture is driven by a motor.
There are publications such as No. 825.

All of these conventional techniques use a stenobifugu motor, in which the stator and rotor constituting the stamping motor are hollow, the hollow rotor is connected to a lens moving mechanism or an aperture setting member, and the hollow rotor is connected to a lens moving mechanism or an aperture setting member. A technical idea is disclosed in which the forward and reverse rotation of a rotor controls the appropriate movement of a lens or a diaphragm.

Problems to be Solved by the Invention However, when considering the application to an actual camera device,
Needless to say, two motors are required, one for moving the lens and one for moving the diaphragm, and the structure becomes complicated, such as the location of each motor and independent control circuits, and the shape also becomes larger. Put it away.

The present invention was made in consideration of the above-mentioned problems.1
An object of the present invention is to provide a lens and aperture moving device using a new motor that can control the movement of both the lens and aperture using a single motor.

Means for Solving the Problem A hollow stator is fixed to a fixed part of the main body of the optical lens device, a hollow rotor is rotatably mounted inside the stator, and a rotor is mounted inside the rotor. A hollow threaded member is fixed and has a first threaded part inside, and a second threaded part that holds a lens to be moved and is threadedly engaged with the first threaded part on the outer peripheral surface. A lens barrel, a well-known diaphragm mechanism that is fixed to the lens barrel and has an aperture drive member protruding outside the main body that opens and closes a plurality of aperture blades provided inside the main body, and a well-known aperture mechanism that projects from the stator. A lens driven by a motor according to the present invention, comprising the aperture driving member and a protruding member connected freely in the direction of the optical axis of the lens and serving as a fulcrum in the direction of rotation about the optical axis. and an aperture moving device are configured.

Operation Since the motor-based closing/squeezing and squeezing moving device according to the present invention has the above-described configuration, when the rotor rotates in the forward and reverse directions, the rotational force is transmitted through the first and second threads, etc.
The entire amount of movement of the aperture drive member of the aperture mechanism is transmitted to the lens barrel as play.

Therefore, by setting the movement start point of the lens barrel, it is possible to move the lens barrel together with the diaphragm mechanism to a desired appropriate position by rotating the rotor in a predetermined direction, and the lens barrel can be moved to a desired position. By rotating the rotor in the opposite direction at the lens barrel position, the diaphragm driving member, which acts as play against movement of the lens barrel, can be moved over the entire range of movement.

In other words, the movement of the lens barrel can be controlled by rotating the motor in a predetermined direction, and the aperture setting operation of the aperture mechanism can be controlled by rotating the motor in the opposite direction.

Embodiment FIG. 1 is a sectional view of a main part including a partial side view of an embodiment of a motor-driven lens/aperture moving device according to the present invention.

In the figure, 1 is a hollow stator that is fixed to a fixed part 2 of the optical lens device and has a stator coil 1a inside, and 3 is a hollow stator that is fixed to a fixed part 2 of the optical lens device and has a stator coil 1a inside. A hollow rotor 4, which is installed and combined with the stator to constitute a motor, is a hollow screw member that is fixed inside the rotor and has a first screw portion 5 on its inner surface.

It goes without saying that the hollow threaded member 4 may be formed by the rotor 3 itself; in other words, the first threaded part 6 that outputs the rotational force of the rotor 3 is provided inside the rotor 3. It is sufficient if the rotational force output means including the rotational force output means is formed.

Furthermore, although the shape is hollow in the illustrated example, for example, if the amount of movement of the lens barrel 6 in the optical axis direction is not very large, it may be formed into a semicircular shape instead of a hollow shape. Needless to say.

Reference numeral 6 indicates a lens barrel that holds the lens 7 to be moved, and a second threaded portion 8 that is threadedly engaged with the first threaded portion 5 described above is formed on the outer peripheral surface of the lens barrel.

As shown in the perspective view of FIG. 2, reference numeral 9 denotes an aperture drive member 10 in which a plurality of aperture blades 9a contained inside the aperture drive member 9 protrude to the outside of the main body.
A well-known diaphragm mechanism that can be opened and closed by moving in the direction of the arrow is shown, a side view is shown, and the diaphragm mechanism is fixed to the lens barrel 6 described above.

Reference numeral 11 designates a protruding bottle which is fixed to the stator 1 described above and which is fitted into the aperture drive member 10 and its groove 10a.

Since the lens and aperture moving device using a motor according to the present invention has the above-described configuration, the motor is driven by a drive control circuit and a circuit (not shown), and the rotor 3 is moved from the other side of the drawing in FIG. If a driving force is generated toward the side, this driving force is transmitted to the lens barrel 6 and the aperture mechanism 9 via the first threaded portion 5 and the second threaded portion 8.
It will be transmitted to

Therefore, first, the diaphragm drive member 1o of the diaphragm mechanism 9 rotates in the direction indicated by the arrow in FIG. will reach the left end 12&.

Once the diaphragm driving member 1o reaches the left end 12&, the diaphragm driving member 1o, the diaphragm mechanism 9 having this member 1°, and the lens barrel 6 to which this diaphragm mechanism 9 is fixed cannot rotate, so in this state. The driving force of the rotor 3 described above is applied to the lens barrel e itself. Force is supplied via the second threaded portions 5,8.

Therefore, as the rotor 3 rotates, the lens barrel 6 itself begins to move, for example, to the left in FIG. 1 along its optical axis. At this time, the diaphragm mechanism 9 also moves in the optical axis direction, but if the length of the protruding pin 11 is made long, the connection with the diaphragm drive member 10 will not be released.

When the lens barrel 6 reaches a desired position based on a signal from, for example, an autofocus mechanism (not shown), the rotation of the rotor 3 is stopped, thereby completing the active operation of the lens barrel 7.

The rotation of the rotor 3 can be stopped by detecting the position of the lens barrel 6 using a well-known encoder technology, or by
It goes without saying that if a stepping motor is formed in combination with the stator 1, this can be easily realized by obtaining positional information of the lens barrel 6 by detecting its driving amount.

Next, if the rotor 3 is rotated in the opposite direction, that is, from this side of the drawing to the other side in FIG. 1, in other words, to the left when viewed from the front, the rotor 3 The driving force is first transmitted to the aperture drive member 10 of the aperture mechanism 9 via the threaded portion 8 of the lens barrel 6 and the like.

That is, since the lens barrel 6 is screwed together via the first threaded part 5 and the second threaded part 8 of the hollow threaded member 4 fixed to the rotor 3, there is a gap between the threaded parts 5 and 8. Due to the friction, the object first tries to rotate itself.

Therefore, the main body of the diaphragm mechanism 9 itself, which is fixed to the lens barrel 6, also rotates.

However, the rotating direction of the aperture mechanism 9 is opposite to that in the previous case, that is, in the direction of arrow B in FIG. Since this protruding pin 11 serves as a fulcrum, the right end 12 of the moving groove 12 moves in the positive direction.

As a result, if the position of the aperture drive member 10 relative to the movement groove 12 is set so that the aperture is fully closed when it is at the left end 12a, and the aperture is fully open when it is at the right end 12k), The desired aperture value can be set by appropriately controlling the rotation of the rotor in the opposite direction based on signals from an exposure control device (not shown), etc., and the present invention does not allow such a control operation. be.

By rotating the rotor 3 in the forward and reverse directions as described above, the movement of the lens 7 and the aperture blades 9a can be controlled to desired positions, and thereafter a photographing operation is performed by an appropriate shutter operation.

Although not mentioned in the above explanation, in the present invention,
It goes without saying that the lens barrel 6 needs to have its movement start point set at the closest point or farthest point from which photography can be performed.

Regarding the diaphragm mechanism 9, although the above explanation was based on the fact that the lens barrel 6 is in a fully closed state during the movement operation, the lens barrel 6 is moved in a fully open state, and the rotor 3
It goes without saying that the narrowing down operation may be performed by switching the direction of rotation of the .

Finally, the return to the initial state shown in FIG. 1 from the state in which the lens and aperture are controlled as desired by the above-described operations will be described.

After the lens and aperture settings have been made and the appropriate shutter operation has been performed, the rotor 3 is moved in the direction that controls the aperture mechanism 9.
That is, when further rotated in the direction from this side to the other side in FIG.
2, and cannot move from there on.

Then, the driving force due to the subsequent rotation of the rotor 3 is the first. The frictional force of the second threaded portions 5 and 8 is overcome, and as a result, the lens barrel 6 works to move along the optical axis in the right direction, which is the opposite direction to the setting operation described above. By detecting the state shown in FIG. 1 by an appropriate method and controlling the rotation of the rotor 3 based on the detection result, the first
The moving device according to the present invention can return to the state shown in the figure. In this example, it goes without saying that the operation of returning to the state shown in FIG. 1 is performed with the aperture fully open.

Effects of the Invention The lens and aperture moving device using a motor according to the present invention transmits the rotational force of the motor in a predetermined direction to the lens barrel via the aperture setting member of the aperture mechanism, and moves the lens barrel to a desired position. At the same time, the rotational force of the motor in the opposite direction is transmitted to the aperture drive member of the aperture mechanism via the lens barrel to control the aperture to the desired position, so a single motor controls the movement of both the lens and the aperture. We will have a new winter effect that will be possible.

In addition, the above-mentioned effects specifically provide an effect of providing a motor-driven lens and aperture moving device that can simplify the structure and reduce the size.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part including a partial side view of a lens and aperture moving device using a motor according to the present invention, and FIG. 2 is a perspective view of a well-known aperture mechanism 9 fixed to the lens barrel 6 in FIG. It is. 1...Stator, 2...Fixed part, 3.
...Rotor, 4...Hollow screw member, 5...
...First thread, 6. Old lens barrel, 7.
・・・shi/zu, 8...second screw part, 9...
...Aperture mechanism, 19...Aperture drive member, 11.
...Protruding bottle, 12...Movement groove.

Claims (2)

[Claims] (1) A hollow stator fixed to a fixed part in an optical lens device; a hollow rotor rotatably mounted inside the stator and combined with the stator to form a motor; a rotational force output means having a first screw portion that outputs the rotational force of the rotor on the inside;
a lens barrel that holds a lens to be moved and has a second threaded portion on its outer peripheral surface that is threadedly engaged with the first threaded portion;
an aperture mechanism that is fixed to the lens barrel and has an aperture drive member that opens and closes a plurality of aperture blades provided inside the main body and protrudes to the outside of the main body; and an aperture drive member that protrudes from the stator. and a protruding member connected freely in the direction of the optical axis of the lens and as a fulcrum in the direction of rotation about the optical axis, and the lens is rotated by rotation of the rotor in a predetermined direction. A lens and aperture moving device using a motor that moves a lens barrel together with the aperture mechanism to a predetermined position, and moves the aperture driving member of the aperture mechanism to a predetermined position by rotating the rotor in a direction opposite to the predetermined direction. (2) The lens and diaphragm moving device using a motor according to claim 1, wherein the rotational force output means is a hollow screw member that is fixed to the rotor inside the rotor and has a first screw portion therein.