JPS60211410A - Zoom motor controller - Google Patents

Abstract

PURPOSE:To improve the durability of a zoom motor controller and to reduce it in size and weight by using a magnetic detecting means for zooming operation. CONSTITUTION:A zoom operating part 24 is provided to a substrate 21 through an operating part fixation base 20. The 1st pressure part 25a of the zooming operation part 24 is pressed to rotate the zooming operation part 24 counterclockwise, and the magnetic detecting means 27, such as a Hall element, fitted under the zooming operation part 24 moves and faces the N pole 29 of a magnet 25 fitted to the substrate 21 opposite the magnetic detecting means 27. The output voltage of the magnetic detecting means 27 is amplified by a control circuit 33 and supplied to a zooming motor 34 to move a variable power lens 40, thus performing power varying operation. When the 2nd pressure part 25b of the zooming operation part 24, the variable power lens 40 moves in the opposite direction. When the pressing force is removed, coil springs 32a and 32b return to a balanced state.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a zoom motor control device that can be used in video cameras and the like.

Structure of the conventional example and its problems In recent years, there has been a trend to freely vary the zoom speed during electric zooming of a video camera.Hereinafter, a conventional zoom motor control device will be described with reference to the drawings. FIG. 1 is a plan view of the main parts of a conventional zoom motor control device, FIG. 2 is a front view of the main parts, and FIGS. 3 and 4 are front views of the main parts during suppression. In those figures, a substrate 1 includes a variable resistor 2. First stopper3. The drive shaft 6 of the variable resistor 2 is fixed to the second stand bar 4.
are provided with a first restoring lever 6, a second restoring lever 7, and a torsion coil spring 8, which are rotatable around the drive shaft 5. Further, the drive shaft 5 is provided with a zoom operation section 9 31 .

The zoom operation section 9 has a first suppression section 9 on the top surface.
a, a second suppressing portion 9b, and a rotating pin 1o on the side surface.

The operation of the conventional zoom motor control device configured as described above will be described below.

When the first suppressing part 9a of the zoom operating part 9 is pressed, the first restoring lever 6 is moved by a rotating pin 10 that moves integrally with the zoom operating part 9.
It is pushed by and rotates counterclockwise around the drive shaft 5 as shown in FIG.

On the other hand, the second restoring lever 7 is not rotated by the second stopper 4. The rotation angle of the zoom operation section 9 changes according to the pressing force, and as the pressing force continues to increase, the rotation angle of the zoom operation section 9 continues to increase until the zoom operation section 9 hits the first stopper 3. Once the zoom operation section 9 hits the first stopper 3, it will not rotate any further even if the pressing force is increased. When the pressing force is removed, the zoom operation section 9 returns to the equilibrium position shown in FIG. 2 by the torsion coil spring 8. The drive shaft 6 of the variable resistor 2 moves integrally with the zoom operation section 9. Therefore, as the drive shaft 6 rotates, the resistance value of the variable resistor 2 changes continuously in accordance with the amount of suppression. Since a positive output voltage corresponding to the amount of change in resistance value is obtained from the control circuit, the speed of the zoom motor can be freely changed by changing the amount of pressure.

On the other hand, when the zoom operation part 9b is pushed, the drive shaft 5 of the variable resistor 2 rotates in the opposite direction, and a negative output voltage corresponding to the amount of suppression is obtained from the control circuit, and the zoom operation is performed by rotating in the opposite direction to that described above. The rotation of the motor can be changed freely.

However, when a variable resistor is used in the above-mentioned configuration, there are problems in that the resistor wears out each time it rotates, and the sliding contacts become poor contacts.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a zoom motor control device that is durable and can easily be made smaller and lighter.

Configuration of the Invention The zoom motor control device of the present invention includes a substrate, a magnet fixed to the substrate, and a first suppressing section 511. - A magnet having a second suppressing part and fixed to the substrate, a movable means rotatable about a fulcrum, a restoring means for restoring the movable means to a fixed position, and integrally with the movable means. The output when the movable means moves and pushes out the first suppressor and the output when the second suppressor is pushed are opposite to the output when the movable means is in a fixed position, and magnetic detection means that obtains an output according to the relative amount of displacement;
A zoom motor for driving a zoom lens, and a control means for controlling rotation of the zoom motor according to an output obtained from the magnetic detection means, the first suppressing portion or the second pressing portion of the movable means being When pressed, the rotation of the zoom motor is reversed, and the zoom motor is rotated at a speed corresponding to the amount of pressure on either one of the suppressing parts.This makes it durable, compact and lightweight. This makes it possible to realize a zoom motor control device.

Description of examples Below, reference will be made to the drawings for embodiments of the present invention6. I will explain.

FIG. 5 is a configuration diagram of the main parts of a zoom motor control device according to an embodiment of the present invention, FIG. 6 is a plan view of the main parts, and FIGS.
The figure is a front view of the main part during suppression, and FIG. 9 is an output characteristic diagram of the Hall element. In FIG. 5, the operation unit fixing base 20 is fixed to a substrate 21 made of glass epoxy, and the rotating shaft 22
is attached by an E-shaped ring 23. Rotation axis 22
The zoom operation unit 24, which rotates around
Stopper 268. It has a second stopper 26b, and a Hall element 27 is fixed to the lower part. A magnet 28 is attached to the substrate facing the Hall element 27, and the upper side 29a of the magnet 28 has an N pole and the lower side 29
b is the south pole, and the center of the magnet 28 faces the Hall element 27 when the zoom operation section 24 is in an equilibrium state.

The board 21 has a first spring stop 30a and a second spring stop 3.
0b.

The zoom operation section 24 is provided with a first spring stop 31a and a second spring stop 31b, which fix the first compression coil spring 71''-- spring 32a and the second compression coil spring 32b.

The output of the Hall element 27 is connected to a control circuit 33, and the zoom motor 34 is rotated by the output voltage of the control circuit 33. A pinion gear 36 is press-fitted into the rotating shaft 35 of the zoom motor 34 and meshes with a rack gear 37. The first guide pole 3 is attached to the rack gear 37.
8a, a movable frame 39 held by the second guide pole 38b is integrated, and a variable magnification lens 40 is fixed to the movable frame 39.

The operation of the zoom motor control device of this embodiment configured as described above will be described below.

First, by pressing the first suppressing part 25a, the zoom operation part 24 is rotated counterclockwise about the rotation axis 22 as shown in FIG. The first compression coil spring 32a is compressed from when the zoom operation section is at the equilibrium position, the second compression coil spring 32b is in an extended state, and the Hall element 27 moves in the direction facing the ON pole 29a of the magnet 28.

As the pressing force increases, the rotation angle of the zoom operation section 240 increases, and when the first stopper 26a comes into contact with the substrate 21.

Beyond that, it will not rotate even if the pressing force is increased. When the pressing force is removed, the first compression coil spring 32a and the second compression coil spring 32b restore the size to the equilibrium state. As shown in FIG. 9, the output voltage of the Hall element 2 increases as it approaches the N pole compared to the output in the equilibrium state, and decreases as it approaches the S pole, so the output of the Hall element 27 depends on the amount of suppression. increases. The control circuit 23 controls the output of the Hall element 27 from the zoom motor 34 based on the output voltage at equilibrium.
By supplying the zoom motor 34 with a positive output voltage amplified to a level that drives
1, and by moving the variable magnification lens 40, a variable magnification operation can be performed, and the zoom motor 34 can be driven at a variable speed according to the amount of suppression.

Conversely, when the second suppressor 25b is pressed, the S pole 29b of the magnet 28 approaches the Hall element 27 according to the pressing force as shown in FIG. A negative output voltage corresponding to the amount of suppression is obtained from the circuit 33, and the zoom motor is rotated counterclockwise. As the press-fitted pinion gear 36 rotates, the movable frame integrated with the variable power lens moves in the direction of arrow 42, performing a variable power operation.

As described above, according to this embodiment, durability is achieved due to the use of magnetic detection means for zoom operation.

A small and lightweight zoom operation device has been realized.

Effects of the Invention As is clear from the above description, the zoom motor control device of the present invention includes a substrate, a magnet fixed to the substrate, a first suppressing portion, and a second suppressing portion fixed to the substrate. a first magnet; a movable means rotatable about a fulcrum; a magnet that operates integrally with the movable means;
The output when the pressing part is pressed and the output when the second suppressing part is pushed are opposite to the output when the movable means is in a fixed position, and the output is in accordance with the displacement amount of the magnet. The movable means includes a magnetic detection means for obtaining an output, a zoom motor for driving the zoom lens 1o, and a control means for controlling the rotation of the zoom motor in accordance with the output obtained from the magnetic detection means. The zoom motor is configured to reverse the rotation of the zoom motor by pressing the first suppressor or the second suppressor, and rotate the zoom motor at a speed corresponding to the amount of suppression of either one of the suppressors. Since the detection part is non-contact, there is no wear of the resistor or poor contact of the sliding contacts, which is the case with conventional variable resistors, resulting in excellent durability and mechanical stability. In particular, since there is no need to fix the variable resistor, it can be simplified, making it possible to reduce the size and weight.

[Brief explanation of the drawing]

Fig. 1 is a plan view of main parts of a conventional zoom motor control device, Fig. 2 is a front view of main parts thereof, Figs. 3 and 4 are front views of main parts in each operating state of Fig. 2, and Fig. 5 9 is a top view of the zoom motor controller 11 according to an embodiment of the present invention, and FIG. 9 is a characteristic diagram of the Hall element output voltage. , 27... Hall element, 28... Magnet, 32a... First compression coil spring, 32b...
...Second compression coil spring, 33...Control circuit. Name of agent: Patent attorney Toshio Nakao and 1 other person
6 Figure 7 Figure 8

Claims (1)

[Scope of Claims] A substrate, a magnet fixed to the substrate, a magnet having a first suppressing part and a second pressing part and fixed to the substrate, and a movable means rotatable about a fulcrum. a restoring means for restoring the movable means to a fixed position; and a restoring means that operates integrally with the movable means so that the output when the first pressing part is pressed and the output when the second pressing part is pressed are the movable means. a magnetic detection means that obtains an output that is opposite to the output when the means is at a fixed position and that corresponds to the amount of displacement relative to the magnet, a zoom motor that drives a zoom lens, and the magnetic detection means. control means for controlling rotation of the zoom motor according to an output obtained from the means;
2, by pressing the suppressing section or the second suppressing section, the rotation of the zoom motor is reversed in the normal direction, and the zoom motor is rotated at a speed corresponding to the suppression amount of either one of the suppressing sections. A zoom motor control device characterized in that the zoom motor control device is configured to