JPH07114066B2 - Still video camera that can be connected to a playback device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a still video camera (electronic still camera) for shooting a subject with an electronic image pickup device and recording the still video signal on a magnetic disk. Still video that can be connected to a playback device
Regarding the camera.

The main function of the still video camera is to record the still video signal of the photographed subject on a predetermined track on the magnetic disk. If the recorded still image can be played back immediately, whether the photographing was successful or not can be confirmed. As it is convenient to check, it is possible to
Realization of a video camera is also required.

When considering a portable handy still video camera, if a playback device including a display device such as a CRT is also incorporated in this camera, it will be large and heavy, which is not preferable. Therefore, it is desirable that a separate reproducing device can be connected to the camera.

In many cases, a reproducing device is connected to perform forward or reverse feeding of a magnetic head to reproduce a desired image, and then the reproducing device is turned off or off to be used again as a camera. In this case, it may be necessary to immediately return the magnetic head to the original position, that is, the track position of the magnetic disk to record the still image captured next time.

SUMMARY OF THE INVENTION An object of the present invention is to provide a still video camera which can be used immediately after a reproducing apparatus is connected and used, and can be immediately moved to a shooting operation without any operation when disconnected. is there.

The present invention relates to a magnetic recording medium in which a magnetic head should be positioned in order to record a video signal representing a taken still image in a still video camera having a recording mode and a reproducing mode using the magnetic head. Track number storage means for storing the track number relating to the magnetic track, and in the recording mode, a video signal representing a photographed still image is displayed on the magnetic track of the magnetic recording medium based on the track number stored in the track number storage means. Recording control means for recording and updating track number storage in the track number storage means, connection detection means for detecting connection and disconnection of a reproducing device for reproducing a still video signal recorded on a magnetic recording medium, and the connection In response to detecting the playback device connection by the detection means In the reproduction mode, in the reproduction mode, the magnetic head is moved in response to a magnetic head sending command from the reproducing device, and the video signal read by the magnetic head is output to the reproducing device, and the connection detection means. In response to the detection of the substantial separation of the reproducing device by the means, the recording mode is entered, and the magnetic head is moved to the track position where the video signal should be recorded based on the track number stored in the track number storage means. It is characterized in that it is provided with a transfer control means.

When the connection detecting means detects a substantial disconnection of the reproducing device, the magnetic head is once returned to the origin position, and then the magnetic head is moved to the position of the track number stored in the track number storing means. It is preferable.

The above-mentioned substantial disconnection is a concept including a case where the connector is actually disconnected and a case where the power source of the reproducing device is turned off.

As described above, according to the present invention, it is possible to connect the reproducing apparatus to the still video camera to reproduce and display the recorded image, and to perform forward and reverse feeding to access a desired track. Then, when the reproducing device is substantially separated from the camera, the magnetic head automatically sends the captured still image to the track to be recorded next. Therefore, there is no need to perform any restoration operation after separation, and the image is taken immediately. You can move on to the operation.

Therefore, the continuity of the shooting operation can be maintained even if the reproducing operation is entered during the recording operation.

Description of Embodiments FIG. 1 shows an electrical configuration of a still video camera 20 and a reproducing apparatus 10 connected thereto. Playback device
10 is a handy simple playback adapter.

The control device 30 controls the operation and overall operation of each part of the still video camera 20. This controller 30
Is composed of a central processing unit, preferably a microprocessor (hereinafter referred to as CPU), a memory for storing its program and necessary data, and an interface with peripheral elements, circuits, devices and the like.

The magnetic disk 21 on which the still video signal of the photographed subject is recorded is housed in a disk pack (not shown). When the magnetic disk 21 is loaded into the camera body, the disk It is mounted on the spindle of the motor 33. The magnetic recording head 31 is arranged so as to be movable in the radial direction of the magnetic disk 21 so as to contact the magnetic recording surface of the mounted magnetic disk 21. Further, a phase detector which detects a magnetic flux in a chucking permanent magnet leaking from a magnetic body (not shown) provided in the core of the magnetic disk 21 and generates one pulse PG for each rotation of the magnetic disk 21. 32 is provided close to the core of the magnetic disk 21. This phase detection pulse PG is input to the control device 30.

A plurality of (for example, 50) tracks are concentrically provided on the magnetic disk 21. A guard band is provided between adjacent tracks. For example, the track width is 60 μm,
Width of guard band is 40 μm, track pitch is 100 μm
m. Track numbers No. 1 to No. 50 are sequentially attached to the 50 tracks of the magnetic disk 21 from the outermost one. The home position HP is located outside the No. 1 track.

The control device 30 is provided with a counter for storing the track number where the magnetic head 31 is currently located, and a memory area for storing the track number on which the still video signal has been recorded.

The disk motor 33 is feed-back controlled by the servo control circuit 34 so as to rotate at a constant rotation speed, for example, at a constant speed of 3,600 rpm. The servo control circuit 34 also
The motor 33 is started and stopped according to commands from the control device 30. In this embodiment, the magnetic disk 11 is 3,600 rp.
Since it rotates at a constant speed of m., the magnetic head 31 records a still video signal for one track, that is, an FM-modulated video signal for one field, every 1/60 seconds of one rotation. This is a standard color such as NTSC when played back.
Compatible with television system.

The magnetic head 31 is movably supported together in the radial direction of the magnetic disk 21 by the transfer drive control device 35, and the transfer is controlled in the same direction. The control device 30 includes a magnetic head 31
The device 35 is instructed as to the transfer direction and transfer amount. The device 35 includes a step motor,
The magnetic head 31 is transferred in proportion to the rotation angle of the motor.
For example, each drive pulse of the step motor rotates about 15 °, and the magnetic head 31 is moved by about 4.2 μm. Therefore, the transfer of the magnetic head 31 is performed very accurately.

Since the video signal is recorded while the magnetic disk 21 is being rotated, in order to keep the touching between the magnetic head 31 and the magnetic disk 21 always in a good state, the regulating plate 28
Is provided.

The image pickup optical system 40 includes an image pickup lens system 41 for forming a subject image, a diaphragm 42, and an optical shutter 43. The diaphragm 42 is controlled by the controller 30 based on the light receiving signal level of a light receiving element (not shown) arranged in the optical path, and the optical shutter 43 is a switch that is turned on by pressing the shutter release button 22. Controlled by controller 30 in response to input by 23.

At the focal plane of the optical system 40, a solid-state electronic image pickup device 44 including a two-dimensional image pickup cell array such as CCD is arranged. The video data accumulated in the image pickup device 44 is read out as a serial video signal in synchronization with the vertical and horizontal synchronizing signals generated in the control device 30 in synchronization with the phase pulse PG, and the luminance thereof is recorded in the recording signal processing circuit 45. The signal component and the color difference signal component are FM-modulated and these modulated signals are combined and sent to the switching, driving and amplifying circuit 36.

This still video camera can record the still video signal captured by the subject on the magnetic disk 21 and reproduce the still video signal recorded on the magnetic disk 21. Under the control of the control device 30, the circuit 36 switches between the recording mode and the reproduction mode, amplifies the video signal to be recorded in the recording mode to drive the magnetic head 31, and in the reproduction mode, the magnetic head. It acts to amplify the reproduction signal obtained at 31.

In the recording mode, the still video signal output from the recording signal processing circuit 45 is recorded on the magnetic disk 11 by the magnetic head 31. In the reproduction mode, the reproduction output of the magnetic head 31 is amplified in the circuit 36 and then sent to the video signal processing circuit 39 and the envelope detection circuit 37. The video signal processing circuit 39 signal-processes the video signal read by the magnetic head 31, and outputs it as a composite color video signal of, for example, NTSC format. The color video signal output from the circuit 39 is applied to the output terminal RF and connected to the CRT 14 of the simple playback adapter 10.
The still video signal recorded on the magnetic disk 21 is visually displayed.

The envelope detection circuit 37 is a read signal of the magnetic head 31,
That is, the FM recorded on the track of the magnetic disk 21
It is a detection circuit that detects the envelope (envelope) of the modulated video signal and outputs a voltage signal corresponding to it. The voltage signal representing the envelope is sent to an analog / digital converter (A / D converter) 38, converted into an 8-bit digital signal representing, for example, a quantization level of 256, and input to the controller 30.

The envelope detection signal is used for searching an unrecorded track on the magnetic disk 21 and detecting (tracking) the center position of a recorded track. If the level of the detection signal does not reach the predetermined threshold level when the magnetic head 31 is transported across the track, the track is unrecorded. In the recording mode, recording of a video signal of a subject imaged on the magnetic disk 21 is performed on the outermost unrecorded track thus searched (in the case of a single shot). The track number determined to be recorded by this search is stored in the recorded track number memory area of the control device 30. This search process is performed, for example, when the magnetic disk 21 is filled or when the power switch of the camera is turned on. In the reproducing mode, the magnetic head 31 is moved in the radial direction of the magnetic disk 21 by a small distance, and it is determined that the position where the detection signal shows a peak is the center of the track on which the video signal is recorded. The still video signal is reproduced in the state of being positioned at the center.

The still video camera 20 is further provided with a connector 24 for connecting the simple playback adapter 10. The connector 24 is provided for inputting a forward feed signal Fwd and a backward feed signal Rev from the adapter 10, respectively. Terminal F, R, adapter 1
An input terminal V for the connection determination signal + V of 0 and an output terminal RF for the playback video signal described above are provided. The terminals F, R, V are connected to the control device 30.

The simple playback adapter 10 includes a forward feed switch 11, a reverse feed switch 12, a power switch 13, a CRT 14 for displaying a still image, and a still image of a still video signal to be input.
It is equipped with a CRT control circuit and so on to appear in CRT14. When the power switch 13 is turned on, the operation of the adapter 10 becomes possible and the connection determination signal + V is output. When the forward feed switch 11 is pressed, the forward feed signal Fwd is output, and when the reverse feed switch 12 is pressed, the reverse feed signal Rev is output.

FIG. 2 schematically shows the reproduction and photographing processing procedure of the still video camera 20, especially its CPU.

Whether or not the simple reproduction adapter 10 is connected is determined based on whether or not the signal + V is input from the terminal V of the connector 24 (step 51). If this signal + V is not input, the adapter 10 is substantially disconnected. That is, whether the connector is not connected,
Alternatively, the power switch 13 is off even if it is connected.

When the signal + V is input, the regeneration mode is set (regeneration mode switching in the switching drive amplifier circuit 36, motor
33, etc.) and the flag F is set to 1 (step 52). This flag F is for detecting that the adapter 10 has been disconnected.

When the forward signal Fwd is input from the adapter 10 (step 5
(YES in 3), progressive processing is performed. That is, the magnetic head 31 is moved inward by about one track and is positioned at the center position of the track by the above-mentioned tracking (relative address system) (step 55). When the reverse feed signal Rev is input, the magnetic head 31 is fed in the reverse direction for one track and positioned at the center of the track (YES in step 54, step 56). Then, the track number counter is incremented or decremented according to the forward or reverse feed (step 57).

A still video signal is read from the track on which the magnetic head 31 of the rotating magnetic disk 21 is located, sent to the adapter 10 via the processing circuit 39 and terminal RF, and the still image is displayed on the CRT 14. Needless to say.

If the judgment signal + V is not input (in step 51,
NO), it is first checked whether the flag F is 1 (step 61). The fact that the flag F is 1 means that the simple reproduction adapter 10 which has been connected until now is substantially disconnected, so that the recording mode is set (circuit 36).
Is switched, the motor 33 is stopped, etc. (step 6
2) The magnetic head 31 is once returned to the home position HP, then moved to the track where the next captured still image should be recorded (step 63), and the flag F is reset to 0 (step 64). The track to be recorded next is the outermost unrecorded track as described above, which is determined based on the recorded track number in the memory area. The transfer of the magnetic head 31 is controlled based on the distance from the home position (absolute address method).

Thereafter, when the shutter release button 22 is pressed, the photographing / recording process is performed (step 66). That is, when the motor 33 is rotationally driven and the rotation of the magnetic disk 21 is stable, the shutter 43 is opened and the still video signal read from the image pickup device 44 is processed by the processing circuit 45 and the amplification circuit 3.
By being supplied to the magnetic head 31 via 6, the still video signal for one frame is recorded on the corresponding track. This recorded track number is stored in the memory area. Further, after the shooting and recording processing is completed, the magnetic head 31 is forwardly moved to the next unrecorded track for the next shooting, and the track number is stored in the counter. The motor 33 also stops.

When the flag F is reset to 0, it means that the recording mode is already in effect, so that the processing of steps 62 to 64 is skipped.

A flag for determining that the recording mode has been switched to the reproduction mode is provided, and when this switching is performed, the magnetic head 31 is moved by one track in the reverse direction,
It is preferable that the still image taken last can be displayed on the adapter 10.

In the continuous shooting mode in which shooting and recording are repeated at regular intervals while the shutter release button 22 is pressed,
As a track to be recorded in step 63, it is preferable to adopt an unrecorded track next to the last recorded track when the magnetic head is moved in the forward direction. As a result, from the track on which the magnetic head 31 is positioned to the final track (track No. 5) of the magnetic disk 21.
Since all the tracks up to 0) are unrecorded, it is only necessary to move the magnetic head one track after each recording / recording.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a flow chart showing the operation of a still video camera. 10… Easy playback adapter, 20… Still video camera, 21
… Magnetic disk, 30… Control device, 31… Magnetic head.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kohei Takahashi 2 26-30 Nishiazabu, Minato-ku, Tokyo Inside Fuji Shashin Film Co., Ltd. (56) Reference JP-A-60-179972 (JP, A) JP JP-A-60-143081 (JP, A) JP-A-57-131182 (JP, A) JP-A-58-189802 (JP, A)

Claims (2)

[Claims] 1. In a still video camera having a recording mode and a reproducing mode, the present invention relates to a magnetic track of a magnetic recording medium on which a magnetic head is to be positioned for recording a video signal representing a captured still image using the magnetic head. Track number storage means for storing a track number, in a recording mode, a video signal representing a captured still image is recorded on a magnetic track of a magnetic recording medium based on the track number stored in the track number storage means, and Recording control means for updating the storage of track numbers in the track number storage means, connection detection means for detecting connection and disconnection of a reproducing device for reproducing a still video signal recorded on a magnetic recording medium, and reproduction by the connection detection means In response to the detection of the device connection, the playback mode is entered. In the playback mode, the magnetic head is moved in response to a magnetic head feed command from the playback device, and playback control means for outputting the video signal read by the magnetic head to the playback device and playback by the connection detection means. A transfer control for moving to a recording mode in response to the detection of a substantial disconnection of the apparatus, and transferring the magnetic head to a track position where a video signal should be recorded based on the track number stored in the track number storage means. A still video camera to which a playback device including means can be connected. 2. The transfer control means, when the connection detecting means detects a substantial disconnection of the reproducing device,
The reproducing apparatus according to claim (1), wherein the magnetic head is once returned to the origin position, and then the magnetic head is moved to the position of the track number stored in the track number storage means. Still video camera that can be connected.