JPS60146210A - Lens movement operating device - Google Patents

Abstract

PURPOSE:To execute a control without contacting by forming a light quantity detecting means varied by an operation of a seesaw switch, in a driving circuit of a zoom lens by a motor. CONSTITUTION:A light shielding plate 20a is provided on a seesaw switch 20 for sending a signal to a controlling circuit of a motor 35 for driving a lens 40 in the forward and backward directions 44, and the light which is made incident on a photodetector 32 by a lens 31 from a light emitting element 25 is varied in accordance with a quantity of pressures 43, 45 of the seesaw switch. It is fetched as a control signal and applied to the motor as a driving voltage corresponding to the pressure quantity, by which a lens driving can be controlled without contacting.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a lens moving operation device that can be used in a video camera.

Conventional Structures and Their Problems In recent years, there has been a trend toward smaller and lighter video cameras and lens movement operating devices that can easily change the zoom speed of a variable power lens.

A conventional lens movement operation device will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a conventional lens movement operation device, in which a gear 2 provided integrally with a scene switch 1 rotates around a rotation shaft 3, and the rotation shaft 3 is connected to an operation board 8.
It is supported by a rotation shaft support plate 4 fixed to. The gear 2 is fixed to the upper surface of the operation board 8 and meshes with a gear 7 press-fitted into the rotating shaft of a volume 6 having the characteristics shown in FIG. The change causes the gear 7 to rotate, and at the same time the resistance value of the volume 6 changes. The control circuit 9 controls the voltage applied to the motor 1o as shown in FIG. 3 according to the resistance value of the volume 6, and controls the rotational speed and direction of the motor 1o. The rack 14 provided above the lens moving frame 13 in which the variable magnification lens 16 is assembled is
It meshes with a gear 12 press-fitted into a rotating shaft 11 of a motor 10, and as the gear 12 rotates, the lens moving frame 13 moves in the forward and reverse directions of an arrow 17 using a guide pole 15 as a guide. In addition, when the seesaw switch 1 is stopped from being depressed and placed in the open state, the compressed pipe 5 fixed between the bottom surface of the scene switch 1 and the top surface of the operation board 8
An equilibrium state is maintained.

The operation of the conventional lens movement operation device configured as described above will be described below. By pressing the gear source ino+1 from the arrow 18 side, the gear 2 rotates counterclockwise, and the gear 7 press-fitted into the rotating shaft of the volume 6 meshing with the gear 2 rotates clockwise. As the gear 7 rotates, the resistance value of the volume 6 increases, and when a voltage is applied to the motor 10 by the control circuit 9, the gear 12 rotates counterclockwise via the rotating shaft 11, and the rack 14 meshing with the gear 12 rotates. The lens moving frame 13 moves in the opposite direction to the arrow 17. Further, by pressing the arrow 19 side of the seesaw switch 1, the lens moving frame 13 moves in the opposite direction to that described above. In addition, Figures 2 and 3
Point A in the figure indicates the equilibrium position of the seesaw switch 1.

However, in the above configuration, when reducing the size and weight, the structure of the lens movement operation device is complicated, the number of parts increases, and the volume occupied by the operation section becomes large.In addition, there are problems in that the means for detecting the amount of rotation is variable. Since a resistor (volume) is used, the contacts deteriorate due to sliding wear of the volume, resulting in a reduction in reliability.

OBJECTS OF THE INVENTION An object of the present invention is to provide a highly reliable lens movement operation device that is compact and lightweight, allows the zoom speed of a variable power lens to be changed with easy operation. .

Structure of the Invention The lens movement operation device of the present invention includes a photographing lens that changes the magnification of an optical image of a subject by moving in the optical axis direction, a driving means for driving the photographing lens, and a light emitting display means for displaying an operating state. a light-receiving element for receiving the light separated by the light-emitting display means; a light-receiving element for receiving the light separated by the light-emitting display means; It is composed of a control suppressing member and a control means for controlling the driving speed of the driving means in accordance with the amount of light detected by the light receiving element.
The lens movement operating device can be made smaller and lighter, and since there is no contact portion that makes mechanical contact, it is possible to significantly improve reliability.

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

FIG. 4 shows a configuration diagram of the main parts of a lens moving operation device according to an embodiment of the present invention.

In FIG. 4, the seesaw switch 20 rotates around a rotation shaft 21, and the rotation shaft 21 is supported by a rotation shaft support plate 23 fixed to a base plate 22. As shown in FIG.

Furthermore, a leaf spring 24 is provided between the seesaw switch 20 and the substrate 22, and the seesaw switch 20 is maintained in a balanced state by the leaf spring 24. A light emitting element 26 such as a light emitting diode is fixed to the substrate 22 and covered with a cover 26. The upper part of the cover 26 is provided with a first hole 27 for passing light, and the light emitting element 26 connects the power display unit 29, which is glued to the outer case 28 and made of a material such as transparent acrylic resin. It can be irradiated. Further, a second hole 30 is provided on the side surface of the cover 26, and the light from the light emitting element 26 illuminates the light receiving element 32 through a lens 31 provided inside the cover 26. The light-receiving element 32 is fixed to the substrate 22, and is composed of a silicon photodiode or the like having a rectangular light-receiving surface.

The light beam that illuminates the light receiving element 32 is the scene switch 2Q.
The scene switch 20 is shielded from light by a light shielding plate 20a that is integrally provided in a part of the light shielding plate 20a.
4, the light is set so that half of the light-receiving surface of the light-receiving element 32 is irradiated with light. Note that the light emitting element 26 is connected to a power source 33 of the device.

The light receiving element 32 is connected to a control circuit 34, and the control circuit 34
applies a voltage to the zoom motor 35 as shown in FIG. 5 in accordance with the amount of light detected by the light receiving element 32. The rotation direction and rotation speed of the zoom motor 35 are determined according to this applied voltage, and the zoom motor 35 rotates the lens moving frame 38 via a pinion gear 37 press-fitted into the rotation shaft 36 of the zoom motor 350.
The signal is transmitted to a rack gear 39 provided at the top of the frame. The lens moving frame 38 holds the variable magnification lens 40, and since it is not guided by the guide poles 41a and 41b, the variable magnification lens 4
0 in the direction of the optical axis 42.

The operation of the lens moving operation device of this embodiment configured as described above will be explained below. First, when power is supplied to the device, the light emitting element 26 lights up, and the power is turned on by illuminating the power display member 29 through the first hole 27 at the top of the cover 26.

You can check it off. Next, by pressing the seesaw switch 20 from the arrow 43 side, the rotation shaft 21
The light shielding plate 20a moves downward using the point as a fulcrum, and the amount of light irradiating the light receiving element 32 decreases.

As the amount of light decreases, the output current of the light receiving element 32 decreases, and the control circuit 34 applies a negative voltage to the zoom motor 35 as shown in FIG. 5 according to the amount of light, causing the zoom motor 36 to move clockwise. Rotate. Zoom motor 35
As the rack gear 39 meshes with the pinion gear 37, the lens moving frame 38 moves toward the guide ball 41a.
, 41b to move in the direction of arrow 44 and perform a magnification change operation. Also, seesaw switch 2
Since the amount of movement of the light shielding plate 20a changes depending on the amount of suppression of 0, the amount of light received by the light receiving element 32 can be controlled, and when the seesaw switch 20 is lightly pressed, a low voltage is applied to the zoom motor 35, thereby increasing the rotation speed. decreases, and the moving speed of the lens moving frame 38 slows down, and when pressed deeply, a high voltage is applied to the zoom motor 35, thereby increasing the moving speed of the lens moving frame 38. Therefore, by changing the amount of suppression of the seesaw switch 2Q, it is possible to freely control the moving speed (zoom speed) of the variable magnification lens 4o. Further, by pressing the seesaw switch 2o from the arrow 45 side, the light shielding plate 20a moves upward, contrary to the above-mentioned operation, and the light receiving element 3
The amount of light to 2 increases. As the amount of light increases, the light receiving element 33
, the control circuit 34 applies a positive voltage to the zoom motor 35, the zoom motor 35 rotates counterclockwise, and the lens moving frame moves in the direction opposite to the arrow 44. When the seesaw switch is not pressed, an equilibrium state is maintained by the biasing force of the leaf spring 24, and the control circuit 34
The output voltage from .degree. is zero as shown at point A in FIG. 5, the zoom motor 35 does not rotate, and the magnification changing operation is stopped.

As described in 2 below, according to this embodiment, a light emitting element and a light receiving element are installed facing each other, and the amount of light hitting the light receiving element is controlled by moving up and down a light shielding plate provided between them and linked to a seesaw switch. By configuring the zoom motor to rotate forward or reverse depending on the amount of light, the operating unit is smaller and lighter, and there is no sliding contact like a variable resistor, making contactless control possible and improving reliability. can be achieved.

By using a light-emitting body for displaying the operating status as a light-emitting element, a dedicated light-emitting body becomes unnecessary and power consumption can be reduced.

Note that in the above-described embodiments of the present invention, the light-emitting element is a light-emitting body that indicates whether the power is on or off.
Any light emitter that lights up when performing a magnification change operation may be used.

Effects of the Invention As is clear from the above description, the present invention provides a photographic lens that changes the magnification of an optical image of a subject by moving in the optical axis direction, a driving means that drives the photographic lens, and a light emitting device that displays the operating state. a display means, a spectroscopy means for dispersing a part of the amount of light emitted by the light emitting display means, a light receiving element for receiving the light separated by the spectroscopy means, and a light receiving element provided in front of the light receiving element, which controls the amount of light from the light source according to the amount of suppression. The structure includes a light amount control suppressing member that varies the amount of light, and a control means that controls the driving speed of the driving means in accordance with the amount of light detected by the light receiving element, so there is no mechanical sliding contact and it is non-contact. It has a long life and can greatly improve reliability.

Since the rotation of the zoom motor is still controlled using the light from the light-emitting element for displaying the operating status, there is no need for a dedicated light-emitting body, and the advantages of small size, light weight, and low power consumption can be achieved.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of the main parts of a conventional lens movement operation device;
The figure is a characteristic diagram of the rotation angle of the volume versus the resistance value in the conventional example shown in Figure 1, Figure 3 is an output characteristic diagram of the control circuit in the conventional example shown in Figure 1, and Figure 4 is a diagram according to an embodiment of the present invention. FIG. 5 is a block diagram of the main parts of the lens moving operation device, and is a diagram showing the output characteristics of the control circuit in the embodiment of the present invention. 20 seesaw switch, 25... light emitting element, 26
...Cover, 32... Light receiving element, 34.-
・Control circuit, 35...Zoom motor, 4o...
variable magnification lens. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 4 Figure 5

Claims (1)

[Claims] A photographing lens that changes the magnification of an optical image of a subject by moving in the optical axis direction; a driving means that drives the photographic lens; a light emitting display means that displays an operating state; and a part of the amount of light produced by the light emitting display means. a light-receiving element that receives light separated by the light-separating means; a light-amount control pressing member that is provided in front of the light-receiving element and that changes the amount of light from the light source according to the amount of pressure; A lens movement operation device comprising a control means for controlling the driving speed of the driving means in accordance with the amount of light detected by the light receiving element.