JPS60211411A - Zoom motor controller - Google Patents

Abstract

PURPOSE:To improve the durability of the 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 N pole 28a of a magnet 27 fitted under the zooming operation part 28 moves to face a magnetic detecting means 29, such as a Hall element, fitted to the substrate 21 opposite the magnet 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, the lens is returned to its balanced state by springs 32a and 32b.

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.

Conventional configurations and their problems In recent years, there has been a trend to freely vary the zoom speed during electric zooming of video cameras.

A conventional zoom motor control device will be described below 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, a first stopper 3. The four second levers are fixed, and the drive shaft 6 of the variable resistor 2 is 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 6. . Further, a zoom operation section 9 is attached to the drive shaft 6, and the zoom operation section 9 has a first suppressing section 9a and a second suppressing section 9a on the top surface.
It has a suppressing portion 9b'i and a rotating pin 10 on the side surface.

The operation of the conventional zoom motor control device configured as described above will be described below. The first suppression part 9a of the zoom operation part 9 ((When pressed, the first restoring lever 6 is pushed by the rotating pin 10 that moves integrally with the zoom operation part 9, and the third
As shown in the figure, it rotates in the counterclockwise direction using the drive shaft 5 as a fulcrum.

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 as 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 releases the torsion coil spring 8.
3, the drive shaft 5 of the 0T resistor 2 moves integrally with the zoom operation section 9. Therefore, as the drive shaft 5 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 suppression.

On the other hand, when the zoom operation part 9b'jz is pressed, the drive shaft 6 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. The rotation of the zoom motor can be changed completely 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 have poor contact.

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.

Structure of the Invention The zoom motor control device of the present invention includes a first suppressor and a second suppressor.
A movable means having a suppressing part and rotatable about a fulcrum, a restoring means for restoring the movable means to a fixed position, a tuna fish that operates integrally with the movable means, and a first suppressing part. A magnetism that obtains an output when the movable means is pressed and an output when the second suppressing part is pressed are opposite to each other with respect to an output when the movable means is in a fixed position, and an output corresponding to the displacement amount of the magnet. A detection means, 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 suppressor or the second suppressor of the movable means. By pressing the pressing part, the rotation of the zoom motor 9 is reversed, and the zoom motor is rotated at a speed corresponding to the amount of suppression of either one of the suppression parts. This makes it possible to realize a small and lightweight zoom motor control device.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 6 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. 7 and 8 are front views of the main parts when suppressed. FIG. 9 is a diagram showing the output characteristics of the Hall element.

In FIG. 5, the operation unit fixing base 20 is fixed to a substrate 21 made of glass epoxy, and nine rotation shafts 22 are attached by an E-shaped ring 23. The zoom operation unit 24, which rotates around the rotation axis 22, includes a first suppressing unit 26a at the top,
The second suppressing part 25b'i has a first stopper 26a and a second stopper 261) k on the side thereof, and a magnet 27 is bonded to the lower part thereof. The upper side 28a of the magnet 27 has an S pole, and the lower side 28b has an N pole. When the zoom operation section 24 is in an equilibrium state, the center of the magnet 27 faces the Hall element 29 soldered to the substrate 21, and the magnet 27 faces the Hall element 29 soldered to the substrate 21. The first spring stopper 30a, the second spring stopper 3
0b, the zoom operation section 24 has a first spring stopper 31a and a second spring stopper 31a.
A spring corrector 31bi is provided, and a first compression coil spring 32
a, the second compression coil spring 32b'i is fixed. Further, the output of the Hall element 29 is connected to a control circuit 33, and the zoom motor 34 is controlled by the output voltage of the control circuit 33.
Rotate. The rotation shaft 36 of the zoom motor 34 has a pinio 7/1. .

A ring gear 36 is press-fitted therein and meshes with a rack gear 37. The rack gear 37 has a first guide ball 38a.
, the moving frame 39 held by the second guide ball 38b
are integrated, and the variable magnification lens 40 is mounted on the movable frame 39.
is fixed.

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

First, by pressing the first pressing part 25ai, the zoom operation part 24 rotates about the rotation axis 22 as shown in FIG.
rotates in the counter-timetable direction. 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 north pole 28b of the magnet 2 moves in the direction facing the hold element 29. As the pressing force is increased, the rotation angle of the zoom operation section 24 increases, and once the first stopper 26a comes into contact with the substrate 21, it will not rotate any more 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 balance to an equilibrium state. As shown in FIG. 9, the output voltage of the Hall element 29 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 29 changes depending on the amount of pressure. To increase. The control circuit 23 supplies the zoom motor 34 with a positive output voltage that has been amplified to a level that drives the zoom motor 34 with the output of the Hall element 29 as the standard for the output voltage at equilibrium.

The rotating shaft 36 rotates clockwise, and the movable frame 39 is moved in the direction of the arrow 41 by the pinion gear 36, and the variable magnification lens 4
By moving 0, magnification can be changed, and the zoom motor can be driven at 34 speeds at a speed corresponding to the amount of suppression.

Conversely, when the second suppressor 25bi is pressed, the S pole 2B& of the magnet 27 approaches the Hall element 29 according to the pressing force as shown in FIG. A negative output voltage corresponding to the amount of suppression is obtained from 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 the arrow 42 and performs variable power operations 9 . . . .

As described above, the present embodiment is durable 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 has a movable means that has a first suppressing part and a second suppressing part and is rotatable about a fulcrum, and a movable means that allows the movable means to remain constant. a restoring means for restoring the movable means to the position, a magnet operating integrally with the movable means, and an output when the first suppressing part is pressed and an output when the second suppressing part is pressed so that the movable means is in a constant position. a magnetic detection means that obtains an output that is opposite to the output when the magnet is in position and that corresponds to the amount of displacement of the magnet; a zoom motor that drives a zoom lens; A control means for controlling the rotation of the zoom motor is provided, and the rotation of the zoom motor is reversed by pressing the first or second suppressing section of the movable means, and the rotation of either one of the suppressing sections is reversed. The zoom motor is configured to rotate at a speed of 10-' depending on the suppressing section, and since the detecting section is non-contact, the resistor is not worn out like in the conventional case using a variable resistor. There is no risk of contact failure or poor contact of the sliding contacts.

It has excellent durability, and mechanically, it is not necessary to fix the town transformer, so it can be simplified and made smaller and lighter.

[Brief explanation of drawings]

Fig. 1 is a plan view of the main part of a conventional zoom motor control device, Fig. 2 is a front view of the main part, Figs. 3 and 4 are front views of the main part in each operating state of Fig. 2, and Fig. 6 is a front view of the main part of the conventional zoom motor control device. 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, FIGS. 7 and 8 are front views of the main parts in the operating state, and FIG. It is a characteristic diagram of Hall element output voltage. 21... Board, 22... Rotation axis, 24
...Zoom operation section, 27...Magnet,
29... Hall element, 32a... First
Compression coil spring, 32b... Second compression coil spring, 33... Control circuit. Figure 6 Figure 7 Figure 8

Claims (1)

[Scope of Claims] A movable means having a first suppressing part and a second suppressing part and rotatable about a fulcrum, a restoring means for restoring the movable means to a fixed position, and a movable means integrated with the movable means. an output when the first suppressor is pressed and an output when the second suppressor is pressed are opposite to the output when the movable means is in a fixed position, and comprising a magnetic detection means for obtaining an output according to the amount of displacement of the magnet, a zoom motor for driving a zoom lens, and a control means for controlling rotation of the zoom motor according to the output obtained from the magnetic detection means, By pressing the first pressing portion or the second suppressing portion of the movable means, the rotation of the zoom motor is reversed, and the zoom motor is rotated at a speed corresponding to the amount of suppression of either one of the suppressing portions. A zoom motor control device comprising: 2t:-n