KR960015129B1 - Auto-control device of camcoder zoom lens - Google Patents

Abstract

a first converting means for converting the focused picture of a thing pictured into an electrical digital signal, and outputting the focusing data; a second converting means for converting the relative distance of a converted thing pictured into an electrical digital signal; a switching means for disclosing a zoom lens automatic control mode in order to photograph continuously to the screen size of the thing pictured which is inputted till the present, and setting the focusing data of a first converting means into the fixed distance; a micom for comparing the set distance of a first converting means according to the switching means by inputting signals from the first and the second converting means with the relative distance of the second converting means, and controlling a zooming and focusing photograph to the size of the thing pictured with a fixed distance; and a driving means for driving the focus motor and the zoom motor according to the micom control.

Description

Zoom lens automatic adjustment device of camcorder

1 is a configuration of a zoom lens automatic adjustment device according to an embodiment of the present invention.

2 is a flowchart showing the operation procedure of the zoom lens automatic adjustment device of FIG.

3 is a view for explaining the zoom operation of the zoom lens automatic adjustment device of FIG.

4 is a view showing an example of replacing the rotary variable resistor of FIG. 1 with an optical element.

* Explanation of symbols for main parts of the drawings

1: Focus Lens 2: Zoom Lens

3: CCD 4: amplifier

5: encoder 6: BPF

7: First A / D Converter 8: Integrator

9: micom 10: 2A / D converter

11: zoom motor driver 12: focus motor driver

SW: Switch ZM: Zoom Motor

FM: Focus Motor VR: Rotary Variable Resistor

The present invention relates to a camcorder, and more particularly, to an apparatus for automatically adjusting a zoom lens capable of uniformly capturing a size of a subject that changes according to a subject or a photographer's movement.

Conventionally, when the subject is photographed when the subject changes to perspective or the photographer changes to perspective, the size of the subject is changed and photographed.

Therefore, there is a problem in that the photographer or the subject must maintain an appropriate distance when the subject is to be photographed with the same size.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and to provide an apparatus for automatically adjusting a zoom lens of a camcorder capable of automatically and uniformly capturing a screen size of a subject that changes according to a subject or a photographer's movement.

Camcorder zoom lens automatic adjustment device of the present invention for achieving the above object is the first conversion means for converting the image of the subject formed by the focus lens and the zoom lens into a digital signal to output the focusing data, and the image on the subject A second conversion means for converting the relative distance into an electrical digital signal, and a switch for starting the zoom lens automatic adjustment mode so as to continue shooting at the currently input subject screen size and setting the current focusing data of the first conversion means to a specified distance; Means and a signal input from the first and second converting means to compare the set designated distance of the first converting means set by the switching means with the relative distance of the second converting means to zoom in so as to capture a photographed object at a specified distance. Zoo Ming) and a focusing microcomputer for controlling the focusing, and the focus motor by the control of the microcomputer And a driving means for driving the zoom motor.

Hereinafter, one embodiment of the present invention will be described in detail by the accompanying drawings.

1 is a block diagram of an automatic zoom lens adjustment apparatus according to an embodiment of the present invention, wherein the first converting means is a CCD for converting an image of a subject formed by the focus lens 1 and the zoom lens 2 into an electrical signal. (charge coupled device) 3, an amplifier 4 for amplifying an image signal converted into an electrical signal, and a signal on a subject amplified by the amplifier 4 connected to one side of the amplifier 4 as a video signal. An encoder 5 for outputting, a band pass filter (BPF) 6 for making an image high frequency signal of a signal on the amplified subject connected to the other side of the amplifier 4, and an image output from the BPF 6 Integrates the digital image high frequency signal output from the first A / D (analog / digital) converter 7 and the first A / D converter 7 for converting the high frequency signal into a digital signal and outputs it as focusing data. An integrator 8 for making a second conversion means Rotary variable resistor (VR) provided at the barrel portion of the focus lens (1) to vary the resistance value according to the position of the focus lens, focus lens (1), and rotary variable resistor (VR) provided at the barrel portion of the focus lens (1). A second A / D converter 10 for outputting the relative distance on the current subject according to the movement of the subject or the photographer as a digital signal by using a voltage divided by a predetermined voltage value). And a designated distance switch (SW) for initiating a zoom lens automatic adjustment mode for continuously photographing the subject screen size of the focusing data of the first converting means and setting the focusing data of the first varying means to a designated distance, the photographer taking a distance Selecting a mode that can uniformly photograph the subject size by operating the designated switch (SW), and calculates a predetermined distance from the first A / D converter 10 at the selected time point, The zoom lens is wide so that the digital camera receives the focusing data from the second A / D converter 10, measures the relative distance, and crosses the set distance with the set distance, so that the zoom lens can be photographed with a size on the subject at the set distance according to the comparison result. Alternatively, the microcomputer 9 controlled by tele, and the specified distance set by the switching operation of the distance designation switch SW and the current relative distance are compared by the microcomputer 9, and the microcomputer 9 according to the compared value is compared. The zoom motor driver 11 for driving the zoom motor ZM by control and the focus motor driver 12 for driving the focus motor FM to focus the subject by determining whether focusing is performed by the microcomputer 9. It is composed of

The operation of the zoom lens automatic adjustment device of the camcorder according to the present invention configured as described above will be described with reference to FIGS. 2 and 3.

FIG. 2 is a flowchart showing the operation procedure of the zoom lens automatic adjustment device of FIG. 1, and FIG. 3 is a diagram for explaining the zoom operation.

If you want to continue shooting with the screen size of the current subject during shooting, turn on the zoom lens automatic adjustment and distance setting switch (SW) (step 21), and the focusing data currently input to the microcomputer 9 is set to the specified distance. If the image of the subject changes in accordance with the movement of the subject or the photographer (step 23), it is determined whether the subject is within a minimum distance, for example, 1 m (step 24). If it is not within the minimum distance, it is determined whether the focus motor FM is being driven (step 25), and when the drive is being driven, the relative distance on the changed subject is driven by the rotary variable resistor VR provided in the focus lens 1. The voltage is divided by the predetermined voltage value, converted into digital data by the second A / D converter 10, and input to the microcomputer 9 to evaluate the distance of the subject (step 26).

The relative distance on the input subject and the set designated distance are compared in the microcomputer 9 (step 1 (27)), and the relative distance on the subject is closer than the point representing the set designated distance as shown in FIG. In the case (point (b) of FIG. 3), a rotation direction signal is applied to the zoom motor driver 11 so that the zoom motor ZM can be rotated to the wide side (step 28). When the relative distance of the subject's image is farther than the point (b) (dot (c) in FIG. 3), a rotation direction signal is applied to the zoom motor driver 11 so that the zoom motor ZM can rotate toward the tele. (Step 29).

Thereafter, the microcomputer 9 determines whether the size of the subject on the designated distance and the changed subject having a relative distance match (step 30), and when it does not match, the zoom motor AM is stopped (step ( 31)).

The stop of the zoom motor ZM is also performed to prevent malfunctions when the subject is within the minimum distance and when the focus motor is not driving.

Furthermore, although not shown in FIG. 2, the microcomputer 9 determines whether the focus is achieved, and applies a control signal to the focus motor driver 12 for driving the focus motor FM to perform the auto focusing operation.

As described above, after the zoom lens automatic adjustment and the distance setting switch SW are turned on and the designated distance is input to the microcomputer 9, the above-described operation is continued to keep the screen size of the photographed subject always uniform.

In the above embodiment, the distance from the subject is determined by a rotary potentiometer provided on the barrel portion of the camera lens. However, the present invention is not limited to the above embodiment, and the second conversion means is illustrated in FIG. As described above, the reflecting plate A and the anti-reflective plate B are attached to the surface of the focusing lens barrel, and the focusing lens is positioned by using a plurality of optical elements including the light emitting unit LED ₁ and the light receiving unit LED ₂ -LED ₄ . Accordingly, the light may be selectively received among the plurality of light receiving elements to determine the position of the subject as an electrical position.

As described above, according to the apparatus for automatically adjusting the zoom lens of the camcorder of the present invention, the screen size of the subject that is changed according to the movement of the subject or the movement of the photographer may be automatically obtained at a uniform screen size always without manually operating the zoom motor. It is also possible to meet the needs of users pursuing various functions.

Claims (4)

First converting means for converting an image of a subject formed by a focus lens and a zoom lens into an electrical digital signal to output focusing data, and second converting means for converting a relative distance on the subject to be converted into an electrical digital signal; A switching means for starting a zoom lens automatic adjustment mode so as to continue photographing at a currently inputted subject screen size and setting the focusing data of the current first conversion means to a specified distance, and inputting a signal from the first and second conversion means A micom for controlling zooming and focusing so as to take a photographed image of a subject at a specified distance by comparing the set designated distance of the first converting means set by the switching means with the relative distance of the second converting means; Camcorder comprising a drive means for driving the focus motor and the zoom motor by Automatic lens adjustment. The object of claim 1, wherein the second converting means uses a rotary variable resistor whose resistance value varies according to the position of the focus lens and a value divided by a predetermined voltage value by the rotary variable resistor. Automatic zoom lens of the camcorder characterized in that the A / D converter for outputting the current relative distance according to the digital signal. The method of claim 1, wherein the zoom motor driving means rotates the zoom motor wide when the relative distance is closer to the designated distance, and rotates the zoom motor toward the tele when the relative distance is farther than the specified distance. A zoom lens automatic adjustment device for a camcorder. According to claim 1, The second conversion means is attached to the plurality of reflecting plate (A) and the non-reflective plate (B) on the surface of the barrel portion of the focus lens with a predetermined rule and the light emitted from the light emitting portion (LED ₁ ) reflecting plate (A) And an optical element to selectively receive the light receiving elements of the light receiving parts (LED ₂ to LED ₄ ) by the non-reflective plate (B).

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