JPH04323972A - Camcorder - Google Patents

Abstract

PURPOSE:To prevent video recording in a fog state at rapid zooming by disregarding the operation of a video recording start switch during the rapid zooming even when the video recording start is operated during the rapid zooming in the camcorder so as not to start the video recording. CONSTITUTION:A magnification means A magnifies a picture and a drive means B drives the magnification means A at a variable speed, a video recording means C record a video image, a recording control means D controls the video recording means C and a video recording inhibit means E inhibit video recording while the magnification means A is moved at a speed other than the usual available speed. Thus, even when the video recording start is operated during the rapid zooming, the operation of the video recording start is disregarded during the rapid zooming, the video recording is not started to prevent video recording in a fog state during the rapid zooming.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention relates to a video integrated camera,
In particular, it relates to the control of the recorder during a variable magnification operation.

0002

[Background Art] Looking at camera trends in recent years, for the purpose of miniaturization, etc., lenses that adjust focus by moving the rear lens group (described later), so-called inner focus lenses, have become widely used. .

FIG. 3 is a block diagram of a conventional inner focus type lens system. In Figure 3, 1
01 is a fixed first lens group, 102 is a second lens group (zoom lens) for changing magnification, 103 is an aperture, and 1
04 is the fixed third lens group, 105 is the focus adjustment and second lens group.
A fourth lens group (focus lens) that also has the function of correcting the movement of the focal plane due to the zooming operation by the lens group 102 of
, 106 is an imaging surface.

Next, the operation of this embodiment will be explained using FIG. 3. In FIG. 3, when changing the magnification by moving the zoom lens 102, the fourth lens group 105 has the function of correcting the movement of the focal plane accompanying the changing magnification operation and adjusts the focus, as described above. . FIG. 4 shows this situation.

FIG. 4 is a characteristic curve diagram showing the positional relationship between a zoom lens and a focus lens in a conventional example, and FIG. 5 is a diagram showing a state in which the focus lens representative speed is set for each divided region in FIG.

In FIG. 4, the horizontal axis represents the zoom lens position;
The vertical axis indicates the focus lens position, and indicates the positional relationship between the zoom lens and the focus lens using the subject distance as a parameter. As is clear from Figure 4, if the focus lens moves along a unique trajectory for each subject distance during zooming, it is possible to perform the zooming operation in a focused state without causing so-called "blurring". However, if the image deviates from this trajectory, blurring occurs.

As mentioned above, as a method of moving the focus lens during a zoom operation according to a specific trajectory (FIG. 4) depending on the subject distance, for example,
This is disclosed in Japanese Patent No.-280709 and the like. This method divides the locus in FIG. 4 into regions with approximately equal slopes as shown in FIG. Since one of these is determined, it is described that when the lens is in that area, the focus lens is moved at the representative speed of that area.

On the other hand, during photographing, there are times when it is desired to move the zoom lens from the T (tele) side to the W (wide) side, or vice versa, from the W side to the T side as quickly as possible. In such a case, it has been proposed to perform a rapid zoom operation faster than the normal zoom speed.

[0009]

[Problems to be Solved by the Invention] As described above, in the above conventional example, when an attempt is made to move the zoom lens at a higher speed than the normal moving speed such as rapid zoom, blurring occurs as explained in the above conventional example. In order to avoid
The focus lens also needs to be moved at high speed so as to follow the trajectory shown in FIG. However, the pulse motor commonly used to drive the focus lens is
If the motor is rotated at high speed, the torque will decrease, resulting in loss of synchronization.

On the other hand, the pulse motor also serves as a position encoder (115) that detects the position of the focus lens by counting the number of pulses. As mentioned above, if the pulse motor goes out of step,
Since the position cannot be detected correctly as described above, it becomes impossible to follow the trajectory shown in FIG. 4, and blurring inevitably occurs during rapid zooming. Therefore, if the photographer accidentally starts recording during rapid zoom, there is a problem that the blurred state will be recorded as is.

[0011] This invention was made in order to solve the above-mentioned problems, and even if you accidentally operate the recording start switch during rapid zoom, the operation of the recording start switch will be ignored during the rapid zoom. The purpose is to prevent blurred recording during rapid zoom without starting recording.

0012

[Means for Solving the Problems] Therefore, in claim 1 of the present invention, there is provided a magnification changing means for changing the magnification, a driving means for driving the magnification changing means at a variable speed, and a video recording device for recording an image. and a recording control means for controlling the video recording means, further comprising video recording prohibition means for prohibiting video recording while the magnification changing means is being moved at a speed other than the normal usage speed. The aim is to achieve the above object with a video integrated camera.

[0013] Furthermore, according to claim 2 of the present invention, the above object is achieved by the video integrated camera according to claim 1, which has a communication means for informing the photographer that the video recording inhibiting means is in operation. That is.

[0014]

[Operation] In the video integrated camera according to claim 1 of the present invention, the magnification changing means performs magnification, the driving means drives the magnification changing means at variable speed, the video recording means records the video, and the recording control means The video recording means is controlled by the video recording means, and video recording is prohibited by the video recording prohibition means while the variable magnification means is being moved at a speed other than the normal usage speed.

Further, in the video integrated camera according to claim 2 of the present invention, the communication means notifies the photographer that the video recording prohibition means is in operation.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a video integrated camera according to an embodiment of the present invention, and FIG. 2 is a flowchart for controlling the operation of this embodiment. In the drawings, the same reference numerals as those in the conventional example indicate the same parts or corresponding components, and redundant explanation thereof will be omitted.

In FIG. 1, A is a variable magnification means, and a second
It is composed of a lens group (zoom lens) 102, and is a means for changing magnification. Reference numeral B denotes a driving means, which is composed of an actuator 107 using a motor or the like, and is means for driving the variable power means A at variable speed. C is a video recording means, which is composed of a recorder device 125 and is a means for recording video. D is a recording control means, which is composed of a camera and recorder control circuit 124, and is a means for controlling the video recording means C. Reference numeral E denotes video recording prohibition means, which is constituted by the microcomputer 119, is connected to the recorder control circuit 124, and prohibits video recording while the variable magnification means A is being moved at a speed other than the normal operating speed. F is a communication means, which is composed of an EVF 130, and is a means for communicating to the photographer that the video recording prohibition means E is in operation. Details of each of the above means will be described later.

In addition, in FIG. 1, 107, 108, 1
09 are actuators such as motors for driving the zoom lens 102, aperture 103, and focus lens 105, respectively; 110, 111, and 112 are drivers that drive and control the actuators 107, 108, and 109, respectively; and 113 and 115 are zoom lenses, respectively. 102 and a position encoder for detecting the position of the focus lens 105; 106 is an image sensor, such as a CCD, which converts the image formed by the lens into a video signal and outputs it; 116 is an image sensor that converts the output signal of the image sensor 106; 117 is a band-pass filter that extracts only the high-frequency components effective for detecting the focal state from the output signal of the amplifier 116; 119 is a band-pass filter that extracts only the high-frequency components effective for detecting the focal state from the output signal of the band-pass filter 117; A lens drive control microcomputer 118 controls such things as moving the focus lens 105 to perform focusing, and moving the zoom lens 102 and focus lens 105 simultaneously to perform a zoom operation as described in the conventional example. 120 and 121 are zoom switches for zooming to the wide side (W) and telephoto side (T), respectively; is a rapid zoom switch, and this switch and zoom switch 120 or 12
Pressing both buttons 1 performs a rapid zoom operation. 123 is a switch for starting and stopping recording, and is connected to the recorder control circuit 124.

Next, the operation of the video integrated camera in this embodiment will be explained with reference to the flowchart shown in FIG. In FIG. 2, when execution of the program is started in step 201, it is determined in step 202 whether or not to start recording based on the operation state of switch 123 (FIG. 1) for starting and stopping recording. . If it is determined in step 202 to start recording, the process moves to step 203, where it is determined whether rapid zooming is currently in progress.

If it is not determined in step 202 to start recording, the beginning of the flowchart (step 20
Returning to 2), switch 123 to start and stop recording
It will be in the state of waiting for the operation (FIG. 1). If it is determined in step 203 that rapid zoom is in progress, the operation of the recording start switch 123 (FIG. 1) is ignored, the process moves to step 204 without starting recording, and the electric
A message is displayed in the viewfinder (hereinafter referred to as EVF) that recording will not start because rapid zoom is in progress, and the process returns to step 202. If it is determined in step 203 that a rapid zoom operation is not being performed, the process moves to step 205, where recording is started, and the process moves to step 206.

In step 206, it is determined whether or not to stop recording based on the operating state of the switch 123 for starting and stopping recording. If it is determined in step 206 that recording is to be stopped, step 207
Then, the recording is stopped and the process returns to step 202. If it is determined in step 206 that recording is not to be stopped, the process returns to step 205 to continue recording, and the same determination as described above is repeated again in step 206.

As described above, by repeatedly executing the program shown in this flowchart, it is possible to prevent the problem of accidentally performing a recording start operation during rapid zoom and recording a blurred state.

[0023]

Effects of the Invention As explained above, according to the video integrated camera of the present invention, even if an operation to start recording is made by mistake during rapid zoom in an inner focus type video camera system, even if the operation to start recording is performed during rapid zoom, teeth,
Since the switch operation to start recording is ignored and recording is not started, it is possible to prevent the blurred state from being recorded during rapid zooming.

[Brief explanation of drawings]

[Fig. 1] A configuration diagram of a video integrated camera that is an embodiment of the present invention.

[Figure 2] Flowchart for controlling the operation of this embodiment

[Figure 3] Configuration diagram showing the configuration of a conventional inner focus type lens

[Figure 4] Characteristic curve diagram showing the positional relationship between a conventional zoom lens and a focus lens

[Figure 5] A diagram showing the representative speed of the focus lens set for each divided area in Figure 4.

[Explanation of symbols]

A. Variable magnification means B Driving means C Video recording means D Recording control means E Video recording prohibition means F Transmission means In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (2)

[Claims] 1. A magnification changing means for changing the magnification, a driving means for driving the magnification changing means at a variable speed, a video recording means for recording an image, and a recording control means for controlling the video recording means. 1. A video integrated camera comprising: a video recording inhibiting means for prohibiting video recording while the magnification changing means is moving at a speed other than the normal operating speed. 2. The video integrated camera according to claim 1, further comprising communication means for communicating to the photographer that the video recording prohibition means is in operation.