JPS62276977A - Still picture recorder having field/frame recording mode - Google Patents

Abstract

PURPOSE:To display the remaining number of sheets to be photographed in response to the existing recording mode to be selected by providing a display device for the remaining sheet number. CONSTITUTION:An electronic still camera is provided with a remaining photograph number display device 5. In case of the magnetic disk having 50 tracks, 50-sheet pictures are recorded for the field recording only and 25-sheet pictures are recorded for the frame recording only. In setting the field recording mode by a field/frame recording mode selection switch 52, the count value of a track Tr No. counter CN of a CPU 30 is read and the count TR No. is used to apply the arithmetic operation of 50-Tr.No.+1 and the result of arithmetic operation is displayed on the display device 5 as the remaining number of sheets to be photographed. In case of the frame recording mode, the arithmetic operation of (50-Tr. No.+1)/2 is applied and the result is displayed on a display device 5.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention Summary of the Invention An electronic still camera capable of field recording and frame recording.
Still images from cameras @! In the recording device.

If you can take 50 photos in field recording mode.

The number of shots that can be taken in frame recording mode is half that, 25.
It becomes one piece. Similarly, the number of remaining shots is different between field 5 self-recording mode and frame self-recording mode. Understand the number of remaining recordable tracks.

When field recording mode is set, this remaining number of tracks is displayed as the number of remaining shots that can be taken, and when frame recording mode is set, the remaining number of tracks is divided by 2 and the fraction is rounded down to display the remaining number of shots that can be taken. do.

Background of the Invention This invention represents an electronic still camera that images a subject with an imaging device such as a solid-state electronic image sensor and records the image signal on a rotating magnetic recording medium (hereinafter simply referred to as a magnetic disk) such as a magnetic disk. The present invention relates to an example still image recording device that is capable of switching between field recording and frame recording.

When displaying a screen on a television, interlaced scanning is generally performed, so a video signal is created so that one frame consists of two fields.

However, in S-child still cameras, video signals are recorded on the magnetic disk so that one field corresponds to one frame (image) in order to conserve the recording surface of the magnetic disk on which the video signals are recorded, and for other purposes. Often. This is called a field record. Furthermore, the manner in which one frame of image is obtained using the two fields mentioned above is called frame recording.

It has field recording mode and frame recording mode,
In an electronic still camera that can record in any mode by switching between these modes using a recording mode selection switch, the number of images that can be taken differs between these recording modes. For example, an electronic still camera loaded with a magnetic disk with 50 tracks can take 50 images in field recording mode.
In frame recording mode, you can only take half that number, 25 images. Naturally, the number of remaining shots that can be taken will also differ depending on the selected recording mode.

SUMMARY OF THE INVENTION This invention displays the number of remaining shots that can be taken according to the currently selected recording mode in a still image recording device, typically an electronic still camera capable of field/frame recording. The purpose is to

The still image recording device having a field/frame recording mode according to the present invention includes a mode selection switch for setting either the field recording mode or the frame recording mode, an indicator for the number of remaining shots, and a value regarding the number of recorded tracks. The storage means and the state of the mode selection switch are checked, and the remaining recordable number of tracks is calculated using the total number of tracks and the value related to the number of recorded tracks. The number of tracks is displayed on the display as the number of remaining shots that can be taken, and when the frame recording mode is set, the integer part of the result obtained by dividing the number of remaining tracks by 2 is displayed on the display as the number of shots that can be taken. It is characterized by comprising means for controlling.

As described above, when the field recording mode is set, the remaining number of shots that can be taken is displayed according to the field recording mode, and when the frame recording mode is set, the remaining number of shots that can be taken according to the frame recording mode is displayed. Since each of these is displayed, the user of an electronic still φ camera or the like can immediately know the number of remaining images that can be taken without considering the selected mode.

DESCRIPTION OF THE EMBODIMENTS In this embodiment, the present invention is applied to an electronic still camera.

FIG. 1 shows the electrical configuration of an electronic still camera.

The operation of each part of the electronic still camera and the overall operation are supervised by a control device 30. This control device 30 is composed of a central processing unit, preferably a microprocessor (hereinafter referred to as CPU), a memory that stores its programs and necessary data, and an interface between two peripheral circuits, devices, etc. There is.

A magnetic disk 11 on which video signals are recorded is housed in a disk pack (path shown), and when this magnetic disk 11 is loaded into the camera body, it is attached to the spindle of a disk motor 33 at its center. Ru. Two magnetic recording disks 31 (A, B) are arranged so as to be movable together in the radial direction of the magnetic disk 11 so as to be in contact with the magnetic recording surface of the mounted magnetic disk [l]. In addition, a phase detector detects the magnetic flux of the chucking permanent magnet leaking from the magnetic body (the path shown in the figure) provided in the core of the magnetic disk 11 and generates one pulse PG for each rotation of the magnetic disk 11. 32 is provided close to the core of the magnetic disk 11.

A plurality of (for example, 50) tracks are provided concentrically on the magnetic disk 11 . Guard bands are provided between adjacent tracks, e.g.

Tiger 129 width is 60μm, guard band width is 40μm
m, the track pitch is 100 μm. The two magnetic helads 31 (A, B) provide FM on adjacent tracks.
The tracks are provided at intervals of track φ pitch so that modulated color video signals (including brightness signals, chroma signals, etc.) can be magnetically recorded. In the case of field recording, only magnetic head A is used. In the case of frame recording, both magnetic heads A and B are used, and the video signal of the first field is recorded on a certain track by magnetic head A.

Thereafter, the video signal of the second field is recorded by the magnetic head B on an adjacent (generally inner) track.

The 50 tracks on the magnetic disk 11 are numbered in order from the outermost one, l=No, track numbers up to 50.
, is attached. A home position HP is located outside the track No. 1. A counter CN is provided within the control device 30 to store the track number on which the magnetic head (for example, A) is currently located.

The disk motor 33 is feedback-controlled by a servo control circuit 34 so that it rotates at a constant rotation speed, for example, 3,600 r, p, m.

Also the servo control circuit 34. The motor 33 is started and stopped in accordance with commands from the control device 30. Phase detector 3
The detection pulse PG from 2 is input to the servo control circuit 34 and the control device 30. In this embodiment, the magnetic disk 11 rotates at a constant speed of 3,600 r, p, s, so
One track of video signals, that is, one field of FM modulated video signals, is recorded by magnetic head A or B every 1/60 second of one rotation. This is NTSC
Compatible with standard color television systems.

The magnetic heads 3k (A, B) are controlled by the transfer drive control device 3.
5, the magnetic disk 11 is supported so as to be movable together in the radial direction of the magnetic disk 11, and its movement in the same direction is controlled. Control device 3
0 gives instructions to the device 35 about the direction and amount of transfer of the magnetic helad 31 (A, B). The device 35 includes a step motor, and the magnetic heads A and B are moved in proportion to the rotation angle of the step motor. For example, per xtb pulse of the step motor, this motor rotates approximately 15 degrees, thereby causing the magnetic head 31 (A, B
) is transferred by approximately 4.2 μm. Therefore, the magnetic heads 31 (A, B) are transferred very accurately.

Since video signals are recorded while the magnetic disk 11 is being rotated, a regulating plate 28 is provided to maintain good contact between the magnetic heads 31 (A, B) and the magnetic disk 1 at all times. ing.

In order to function as a camera, an imaging optical system 8 provided in the electronic still camera includes an imaging lens system 41 for forming a photographic image. It is composed of an aperture 42 and an optical shutter 43. The diaphragm 42 is controlled by the control device 30 based on the light reception signal level of a light receiving element (path shown) arranged in the optical path, and the optical shutter 43 is controlled by a switch 56 that is turned on by pressing the shutter release button 6. is controlled by the controller 30 in response to human power.

At the focal plane of the optical system 8, a solid-state electronic imaging device 44 consisting of a two-dimensional imaging cell array, such as a CCD, is arranged. The video data stored in the imaging device 44 is read out as a serial video signal in synchronization with vertical and horizontal synchronizing signals, and the recording signal processing circuit 45 FM modulates the luminance signal component and chroma signal component. Variant: The A signal is combined and sent to the switching, driving and amplifying circuit 36.

The electronic still camera of this embodiment is capable of recording a video signal of a photographed subject on the magnetic disk 11 and also reproducing the video signal recorded on the magnetic disk 11. , L circuit 36 has a function of switching between a recording mode and a playback mode under the control of the control device &30, and also has a function of switching between field recording and frame recording when in the recording mode, and also has a function of switching between field recording and frame recording during recording. It amplifies the magnetic head 31 (A and/or B) and drives the magnetic head 31 (A and/or B), and also acts to amplify the reproduced signal obtained by the magnetic head 31 during reproduction.

In the recording mode, the recording signal processing circuit 45 outputs the first
The video signal of the first field and the video signal of the second field are sequentially output. In field recording mode,
Only the video signal of the first filter is recorded on the magnetic disk 11 by the magnetic head A. In the frame recording mode, the video signal of the first field is recorded on the magnetic disk 11 by the magnetic head A, and then the video signal of the second field is recorded on the magnetic disk 11 by the magnetic head B.

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 processes the video signal read out by the magnetic helad 31 and outputs it as, for example, an NTSC format color video signal. The color video signal output from the circuit 39 is as follows.

The signal is sent to an external color television system (not shown) equipped with a cathode ray tube display (CRT) and its control circuit, and the video signal recorded on the magnetic disk 11 is visually displayed on the CRT.

The envelope detection circuit 37 detects the envelope (
This is a detection circuit that detects the envelope line) and outputs a corresponding voltage signal. The voltage signal representing the envelope is sent to an analog/digital converter (A/D converter) 38;
For example, it is converted into an 8-bit digital signal representing 256 quantization levels and input to the control device 30.

The envelope detection signal is used to search for unrecorded tracks on the magnetic disk 1.1 and to detect the center position of recorded tracks. If the level of the detected signal does not reach a predetermined threshold level when the magnetic head 31 is moved across the track, that track is unrecorded.

In the recording mode, the recording of the video signal of the photographed subject onto the magnetic disk IL is performed on the outermost unrecorded track [ ] searched in this way. In the playback mode, the magnetic helad 31 is moved by small distances in the radial direction of the magnetic disk II, and the position where the detected signal shows a peak is determined to be the center of the track where the video signal is recorded, and the magnetic helad is moved. 31 is positioned at this center, the video signal is reproduced.

The control device 30 controls the rotation of the magnetic disk 11 described above,
In addition to video signal recording control and playback control, it also performs reading of various switches, control of camera operation based on the reading results, and display control of the number of remaining shots that can be taken, which will be described later.

The various switches include a switch 51 for switching between recording mode and playback mode. A switch 52 for selecting either field recording or frame recording in the recording mode. A load end switch 53 that detects that the openable and closable packet that houses the disk bag containing the magnetic disk is closed. A back switch 54 that detects when a disk back is contained within a closed packet. There is a home position switch 55 for detecting that the magnetic head 31 is at the home position HP. The control device 30 performs a key scan routine at regular intervals (for example, 1760 seconds), and in this key scan routine, the control device 30 sends a key scan pulse to the above-mentioned sinch group, and this pulse is returned. The on/off status of the switch is detected based on whether the switch is turned on or off.

Furthermore, the electronic still camera is provided with a display 5 for the number of remaining shots that can be taken. In the case of a magnetic disk having 50 tracks, it is possible to record 50 images if only field recording is used, and it is possible to record 25 images if only frame recording is used. The remaining number of 6J images to be taken is the number of images that can be recorded on unrecorded tracks of the magnetic disk, and is a different value for field recording and frame recording.

In the case of the recording mode, the track number and counter CN provided in the control device 30 indicate the number of the track on which the video signal of the next image to be photographed is to be recorded. In other words, photography is performed.

When the video signal of the image is recorded on a certain track of the magnetic disk 11, the magnetic head 31 is immediately moved to the next track, so this counter CN is 1.0 in the case of field recording. In case of frame recording, it is incremented by 2. When the disk back is filled, the magnetic head 31 is temporarily returned to the home position HP, and a search for unrecorded tracks is performed again from tracks No. and L, and the magnetic head 31 searches for the first unrecorded track found. Stop at track position. However, in the case of frame recording, it may be checked whether there are two adjacent unrecorded tracks.

FIG. 2 shows the display process of the remaining number of images that can be taken, particularly the process performed by the CPU. For example, this process is 1/60
Preferably, this is done by a second interrupt. ,F,
The results of the key scan routine described are stored in memory. Referring to this memory, it is first checked whether the field or frame recording mode is set by the switch 52 (step 1ot).

Track No. if field recording mode is set.

The count value of the counter CN is read out, and this count value Tr, N
o, the calculation of 5O-Tr, No, +1 is performed (step 102), and the result of this calculation is displayed on the display 5 as the number of remaining shots that can be taken (step 103).
). This display content continues to be displayed on the display 5 until the content is updated by the ninth process. After this, other processes such as a key scan routine, photographing process, playback process, etc. are performed.

In the case of frame recording mode, (50-Tr, N
o.

+1)/2 is performed, and if the result of this operation includes a decimal part, only the integer part is extracted (step 104).
, The value of this integer part (or the value of the calculation result if the decimal part is not included) is displayed on the display 5 as the number of remaining shots that can be taken (step 105).

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the electrical configuration of an electronic still camera. Figure 2 shows the flowchart for displaying the number of remaining shots that can be taken.
It is a chart. 5...Remaining number of shots remaining display. 30...control device. 52...Field/frame recording mode selection switch. CN...Current position track number, counter. Patent applicant: Fuji Shakyu Film Co., Ltd. Agent
Patent Attorney Asami Kato (1 other person)

Claims (1)

[Scope of Claims] A mode selection switch for setting either field recording mode or frame recording mode, an indicator for the remaining number of recordable images, means for storing a value regarding the number of recorded tracks, and a mode selection switch for setting either the field recording mode or the frame recording mode. In addition to checking the status, the number of remaining recordable tracks is calculated using the total number of tracks and the value related to the number of recorded tracks, and when the field recording mode is set, the number of remaining tracks is displayed as the number of remaining shots that can be taken. control means for displaying the integer part of the result obtained by dividing the number of remaining tracks by 2 on the display device as the number of remaining shots when a frame recording mode is set; Still image recording device with frame recording mode.