JPS62246181A - Head position controller for still video camera - Google Patents

Abstract

PURPOSE:To obtain a controller which is provided with a responsiveness to reproducing, confirming, and photographing operations of still pictures while constituting head mobile mechanism and control with a simple plunger type constitution by switching the mode to which a recording and reproducing head is moved just after photographing to the mode to which this head is moved just before photographing. CONSTITUTION:A system controller 8 moves a recording and reproducing head 4 successively to the unrecorded track positions of a floppy disk in accordance with photographic recording to execute control procedures for recording of photographed still pictures. When this movement of the recording and reproducing head 4 is controlled, the system controller 8 immediately moves the recording and reproducing head 4 to the next unrecorded track position when a mode set switch 15 is turned on. When the mode set switch 15 is turned off, the recording and reproducing head 4 is stopped as it is, and the head 4 is moved to the unrecorded track position when a release button 14 is operated for the next photographing.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a track position control device for a recording/reproducing head of a still video camera.

Conventionally, still video cameras are configured to record still images on a magnetic disk (generally a small floppy disk) using a magnetic head, and to play back the still images.The magnetic disk on which still images are recorded is attached to a still video player. Still images can be displayed on a television or the like using a camera's playback device.

In such a still video camera, FM-modulated still image signals are concentrically recorded on a magnetic disk via an optical system, an image sensor, etc. for one field per track, and the signals are recorded in order from the first track each time a shooting operation is performed. Field recording or frame recording of still image signals is performed.

・Here, in order to record still images and control the position of the recording/playback head after recording, in the conventional method, the recording/playback head is moved by the number of tracks recorded immediately after shooting, and the head is always placed at an unrecorded track position and then moved to the next position. I try to stand by while taking photos.

Problems to be Solved by the Invention - In the conventional head position control method, the head is always at the unrecorded track position, so when the release button is pressed for the next shooting, the search control for the unrecorded track is not performed. You can immediately record images without having to do anything.

However, in the conventional method, when checking the reproduced image of the already photographed part or when retaking the image, it is necessary to return the head to the recording track position where the previous photograph was recorded.
This recording track search and re-recording requires a high-precision and expensive tracking function such as a head moving device that rotates forward and backward using a stepping motor. There was a risk that adjacent recording tracks would also be erased, or that the data would not be erased sufficiently.

Regarding this point, it is conceivable to leave the head at the recording track position after shooting and recording and wait for the next shooting, and then move the head to an unrecorded track position for the next shooting, but in this method, the release button is pressed. The time delay due to head movement from when the head is set until the actual exposure begins can be a nuisance, and especially in frame photography, since the head is moved by two tracks, the delay becomes large and there is a risk of missing a photo opportunity. Furthermore, when photographing using a floppy disk with randomly recorded data, there is a very large time delay due to the search for unrecorded tracks.

SUMMARY OF THE INVENTION An object of the present invention is to provide a head position control device that enables reproduction and retaking of photographed still images without complicating the head movement mechanism and control, and that does not delay the next photographing.

A means to solve a problem - In order to solve the above-mentioned problems, the present invention provides.

In a still video camera that records still images shot by moving a recording/playback head to an unrecorded track position on a magnetic disk, a control mode in which the recording/playback head is moved to the next unrecorded track position immediately after shooting, and a control mode immediately before shooting. The control mode for moving the recording/reproducing head to the next unrecorded track position is changed over by a changeover setting switch.

-Embodiment- Fig. 1 is a block diagram of main parts showing an embodiment of the present invention. The floppy disk l is driven to rotate at a constant speed by a servo motor 2, which is connected to a servo motor drive circuit 3.
The speed is controlled by constant speed. The recording/reproducing head 4 is a double-gap head having array gaps in the recording track direction (radial direction) of the floppy disk 1, and its plunger type head moving mechanism 5 moves the floppy disk l.
are sequentially moved in the radial direction. The head moving mechanism 5 is driven by a ratchet and a rack by the reciprocating movement of the plunger 6, and the head movement mechanism 5 is driven by a ratchet and a rack by the reciprocating motion of the plunger 6. Part FIfiI! 1f The reproducing head 4 is moved in the direction of the recording track. Plunger 6 is driver circuit 7
A number of drive pulses corresponding to the number of tracks to be moved are applied from the system controller 8 through the track.

Recording current to the recording/reproducing head 4 is supplied from a recording amplifier 9, and the recording amplifier 9 is given an FM-modulated signal of the image information of the object passed through the optical system 10 via the image pickup device 11 and the signal processing circuit 12. .

The playback signal from the recording/playback head 4 is suitably amplified and taken out by a head amplifier 13, and the output of this head amplifier 13 is taken in and played back by a playback adapter, still video player, etc. equipped with an FM demodulation circuit, etc. .

In the configuration described above, the system controller 8 has a microprocessor or the like as its control center, and in addition to controlling image capture and recording in accordance with the operation of the release button 14, it also controls the recording and playback head for the track in accordance with the ON/ON state of the mode setting switch 15. 4 position control is performed. This head position control will be explained in detail below.

The system controller 8 performs a control procedure to record the captured methyl image by sequentially moving the recording/reproducing head 4 to unrecorded track positions on the floppy disk in accordance with the image recording. To control the movement of the recording/reproducing head 4, the system controller 8 uses a mote setting switch 15.
The following two control mode outputs are obtained depending on the on-fist-off state.

First, when the mode setting switch 15 is in the on state (the first
(control mode), the system controller 8 immediately moves the recording and reproducing head 4 to the next unrecorded track position after controlling the image capturing and recording by operating the release button 14.

Next, when the mode setting switch 15 is in the off state (second
control mode), the system controller 8 stops the recording/playback mode 7 at the recording track position even after controlling the image capture/recording by operating the release button 14, and starts capturing the image when operating the release button 14 during the next shooting. Prior to recording control, the recording/reproducing head 4 is moved to an unrecorded track position, and upon completion of this movement, imaging recording control begins.

FIGS. 2 and 3 show the above-mentioned first example in frame recording and field recording. FIG. 2 shows a time chart in frame recording. In the first control mode, the exposure of the image sensor 11 is controlled by operating the release button, and the primary The readout signal is controlled to be recorded on the floppy disk 1, and immediately after this recording, the recording/reproducing head is moved by two tracks.

In the second control mode, the recording/reproducing head is moved by two tracks by operating the release button, and then exposure and recording are controlled.

FIG. 3 shows a time chart for field recording, and the control is the same as in FIG. 2 except that the recording/reproducing head is moved by one track.

From the above, in the first control mode, the recording/reproducing head has been moved to the unrecorded track position in the previous shooting, and shooting can begin immediately by operating the release button.

This is useful when the time delay from release to exposure is short and there is no time to check the playback image, prioritizing the photo opportunity, such as when tracking a moving subject and taking a picture at a certain decisive moment. Become. And the second
In the control mode, the recording/reproducing head remains at the previous recording track position even after shooting is completed until the next shooting, so it is possible to play back the shot image, check whether it is suitable or not, and then re-record. This is useful when you want to play back and check each image while shooting, such as when shooting still life, where there are few changes in the subject, and there is no problem even if the shooting delay in this mode is slightly longer. It is.

Similarly, still image playback, confirmation, and responsiveness can be obtained by switching randomly accessible still video modes.

-Effects of the Invention- As is clear from the above description, the present invention enables switching between a mode in which the recording/reproducing head is moved immediately after shooting and a mode in which it moves immediately before shooting. Although the formula has a simple structure, it has the effect of being responsive to reproduction, confirmation, and photographing operations of photographed methyl images. Furthermore, similar playback, confirmation, and responsiveness can be obtained with the random access type.

[Brief explanation of drawings]

FIG. 1 is a main part configuration diagram showing an embodiment of the present invention, and FIGS. 2 and 3 are time charts for each control mode in FIG. 1. 1... Floppy disk, 2... 廿-Posen-da, 4... Engumo Hyakuru e IV5.
...head moving mechanism, 6... plunger, 8...
・System controller, 9... Recording amplifier, 13... Head amplifier, 1
4... Release button, 15... Mode setting switch. Patent applicant: Konishiroku Photo Industry Co., Ltd. Figure 1

Claims (1)

[Claims] 1) In a still video camera that records still images taken by moving a recording/reproducing head to an unrecorded track position on a magnetic disk, the recording/reproducing head is moved to the next unrecorded track position immediately after photographing. A head position control device for a still video camera, characterized in that a control mode for moving the head and a control mode for moving the recording/playback head to the next unrecorded track position immediately before shooting are switched by a changeover setting switch.