JP3077207B2 - Image recording and playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image recording / reproducing apparatus, and more particularly, to an image recording / reproducing apparatus such as an electronic still camera for recording and reproducing a still image on a recording medium such as a magnetic disk and a solid-state memory.

[0002]

2. Description of the Related Art As the above-mentioned electronic still camera, a camera using a magnetic disk called a still video floppy as a recording medium is known and has already been commercialized. The recording format of the still video floppy is specified by the still video roundtable. In the still video floppy, there are 50 tracks from the outermost first track to the innermost 50th track, and each track can record a video signal of one field. 1
Two adjacent tracks are used for recording a video of a frame. Also, identification information associated with a still image to be recorded, that is, ID information includes date, time, track number, field / frame identification information,
Formats such as codes are specified. Furthermore,
An electronic still camera for digitally recording an image in a solid-state memory such as a semiconductor memory as a recording medium is also known.

In such an electronic still camera, particularly an electronic still camera having a reproducing function, a multi-terminal slide switch is used as means for selecting a plurality of mutually inconsistent operation modes. FIG. 13 is a block diagram showing a configuration of a switch and a system control circuit used for selecting an operation mode in a conventional example. Reference numeral 72 denotes the above-mentioned mode selection switch, which is a slide switch having three terminals L, P, and R connectable to a common terminal S connected to the ground. A system control circuit 74 detects the connection state of the mode selection switch 72 and operates each unit in the corresponding operation mode.

[0004] In the conventional example shown in FIG.
, A playback mode when the terminal P is connected to the terminal S, and a power-off mode when the terminal L is connected to the terminal S. Actually, the terminal L is not connected to the system control circuit 74, and the system control circuit 74 determines from the levels of the terminals R and P whether the terminal S is connected to the terminals R, P or L. I was

[0005]

However, associating the terminals of the mode selection switch 72 with the operation modes as described above has the following problems. That is, in consideration of the actual operation, there is a state in which both the terminals R and P are not connected to the terminal S while the movable piece of the switch 72 moves between the terminal R and the terminal P. This is equivalent to connecting to the terminal S. Actually, the terminal S becomes the terminal R →
The system control circuit 74 should be connected to P → L.
However, it was misunderstood that they were connected to the terminals R → L → P → L, which also caused a malfunction.

An object of the present invention is to provide an image recording / reproducing apparatus which solves such a disadvantage.

[0007]

An image recording / reproducing apparatus according to the present invention comprises a first, a second, and a third selecting section by operating a movable piece.
A switch that can connect any of the selection contacts to a single common contact
Means, wherein the first and second selection contacts are movable.
Switch means located at both ends of the movement range of the piece;
Detection for detecting electrical states of first, second and third selection contacts
Means and the first selection in accordance with the detection result of the detection means.
When the selection contact has a predetermined potential, the first operation mode is selected.
And the second selection contact is at the predetermined potential.
When the second operation mode is selected,
Both the first and second selection contacts are not at the predetermined potential
In the case where the third operation mode is selected,
And the first operation mode is powered off.
Mode .

[0008]

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention applied to an electronic still camera will be described below with reference to the drawings.

FIG. 1 is a schematic block diagram of an electronic still camera to which the present invention is applied. 10 is a taking lens,
12 is a mechanical shutter, 14 is a drive circuit of the shutter 12,
16 is an image sensor, 18 is a process circuit for forming a luminance signal and a color difference signal from the output of the image sensor 16, 20 is a recording circuit that performs recording processing such as modulation on the luminance signal and the color difference signal output from the process circuit 18, and 22 Is a changeover switch for recording, erasing and reproduction, 24 is a video floppy as a recording medium, 26 is a motor for rotating the floppy 24, 28 is a magnetic head, 30 is an erasing circuit for generating an erasing signal, and 32 is a magnetic head 28. A playback circuit 34 performs a playback process such as demodulation on the playback signal and outputs the playback signal in a video signal format. Reference numeral 34 denotes a video output terminal.

Reference numeral 36 denotes a liquid crystal display for displaying the state of the system and various data, and 38 denotes a system control circuit for controlling the entire system. Reference numeral 40 denotes a switch group for inputting a predetermined instruction to the system control circuit 38, and a first release switch 42 is used for a first shutter release operation.
The second release switch 44 is closed by a stroke to instruct a preparation operation for photographing, and the second release switch 44 is closed by a second stroke of the shutter release to instruct a photographing operation. 46
Is a mode selection switch capable of selecting a plurality of operation modes (in this embodiment, a recording mode, a reproduction mode, and a debug mode). In this embodiment, it is a three-contact slide switch. In addition, an up switch 50 for instructing track up, a down switch 52 for instructing track down, and a mode switch 5 for switching the display mode of the display device 36 and the setting mode.
4. There is a BLC switch 56 for performing backlight correction, a DATE switch 58 relating to the date, and a flash switch 60 for turning on / off the flash device. Switch 50,
Detailed functions and additional functions of 52, 54, 56, 58, 60 will be described later.

Reference numeral 70 denotes a motor drive circuit for driving the motor 26, which stops the motor 26 when shutting off. FIG. 11 is an external view of the apparatus according to the embodiment. Reference numerals in the figure correspond to those in FIG.

FIG. 12 is a block diagram showing a configuration of a characteristic portion of this embodiment. The same components as those in FIG. 1 are denoted by the same reference numerals. 130 is a battery serving as a power supply. A switch 132 detects opening and closing of a lid (not shown) of a battery chamber into which the battery 130 is inserted, and is turned on when the lid is completely closed, and is turned off otherwise. 134 and 136 are battery 1
The regulator 134 is a regulator (voltage stabilizing circuit) that converts the output voltage from the output voltage 30 into a predetermined voltage and outputs the converted voltage. The regulator 134 outputs a higher voltage than the regulator 136. Outputs of the regulators 134 and 136 are connected to power input terminals of the system control circuit 38 via diodes 138 and 140 for preventing current backflow, respectively. Regulator 1
The output of 34 also supplies power to the other circuits illustrated in FIG.

The system control circuit 38 deactivates the regulator 134 in the system standby state, is supplied with operating power from the regulator 136 via the diode 140, and operates in the system operating state.
Is activated, and operating power is supplied from the regulator 134 via the diode 138. The system operation state refers to a state in which power is supplied to circuits other than the system control circuit 38 at the time of recording, reproduction, and erasing. The system standby state refers to a low power consumption operation state that includes the system control circuit 38 and is in a standby state or a non-operation state, such as a power-off mode, a floppy disk not mounted, a reproduction shut-off, and a recording mode standby.

The mode selection switch 46 is set to 3 as described above.
The system control circuit 38 comprises a mode selection switch 46 by a key scan.
Detects the connection status of Specifically, the terminal S of the mode selection switch 46 is set to low (L), the power-off mode is set when the terminal L is low, the recording mode is set when the terminal R is low, and the terminals L and R are set to high (H). When playback mode, terminal L,
Set debug mode when R is both low. The debug mode is an operation mode for checking a system operation state, and instructs another control circuit (not shown) from the output terminal 142 to execute a predetermined operation or a predetermined series of operations. For example, a predetermined display is performed on the liquid crystal display device 36, a shutter is operated at a predetermined speed, and a predetermined track is reproduced.

FIG. 2 shows display elements in the liquid crystal display device 36. 100 is displayed when the emission of the flash device is forcibly prohibited, and is turned off when the on / off of the emission is automatically controlled according to the external light amount. Reference numeral 102 is displayed in the normal shooting mode. 104 is displayed at the time of interval shooting or interval playback. Reference numeral 106 is displayed during self-timer shooting. Reference numeral 108 is displayed in the continuous shooting mode. Reference numeral 110 is displayed when distinguishing dates (Y: year, M: month, D: day). Reference numeral 112 blinks when replacement of the clock battery is required. Reference numeral 114 blinks when the main power supply battery needs to be replaced. Reference numeral 116 is displayed in the erase mode. Reference numeral 118 is displayed simultaneously with the display of the reference numeral 116 in the all track erasing mode. 120 is time (H: hour, M:
Displayed when distinguishing between minutes). Reference numeral 122 indicates character numbers such as a date, a time, and a track number according to the situation.

The operation of FIG. 1 will be described schematically. At the time of recording, the shutter 12 is operated by a release operation, and an electric signal from the image sensor 16 is converted into a luminance signal and a color difference signal by the process circuit 18. The recording circuit 20 performs recording processing such as FM modulation on the output of the process circuit 18, and the output is applied to the magnetic head 28 via the switch 22 and recorded on the magnetic disk 24. Also, during playback,
The reproduction output of the magnetic head 28 is applied to the reproduction circuit 32 via the switch 22, and the reproduction circuit 32 performs reproduction processing such as demodulation and outputs a reproduced video signal to the output terminal 34.

The recording operation and the display operation based on this operation will be described with reference to FIG. The mode is switched to the recording mode by operating the mode selection switch 46, and the display device 36 displays FIG.
As shown in (1), the "S" symbol 102 which is the normal shooting mode (S100) is displayed, and the track number is displayed in the character number 122. When the switch 44 is turned on in this state (S104), the captured image is recorded on the magnetic disk 24 as described above (S1). If the switch 44 is kept on after recording, the recorded image is reproduced as described above (S2, 3). At the time of this reproduction, a reproduced video signal in which the track number of the track recorded in S1 is superimposed on the reproduced image is output from the output terminal. When the switch 44 is turned off, the magnetic head 28
Is sent to the next track (S4), and the display device 36 displays the track number after the movement.

Here, when the mode switch 54 is operated, the normal photographing mode is changed to the continuous photographing mode (S101), and the display device 36 displays, as shown in FIG.
The “C” symbol 108 indicating the continuous shooting mode is displayed, and the track number to be recorded is displayed in the character number 122.
When the switch 44 is turned on in this state (S105),
While the switch 44 is on, the captured image is continuously recorded on the magnetic disk 24 (S5, 6, 7).

When the mode switch 54 is operated again,
From the continuous shooting mode to the self-timer shooting mode (S10
2), the display device 36 displays the timer symbol 106 indicating the self-timer shooting mode, and the track number to be recorded in the character number 122 as shown in FIG. When the switch 44 is turned on in this state (S106), the motor 26 rotates and the self-timer light emitting element (not shown) blinks at 8 Hz for 2 seconds (S8).
Thereafter, recording is performed (S9), and the magnetic head 28 is sent to the next track (S10).

When the mode switch 54 is operated again,
In the interval photographing mode (S103), an "INT" symbol 104 indicating the interval photographing mode is displayed on the display device 36, as shown in FIG. A display indicating that the shooting time has not been set, that is, a display consisting of “0” and a small “M” (hereinafter referred to as an interval unset display) is displayed. The interval shooting time is set between 1 and 99 minutes by the up switch 50 and the down switch 52. When the switch 44 is turned on, the above-described recording operation and display are performed, the magnetic head 28 is moved to the next track to be recorded, and thereafter, the "INT" symbol 104 is blinked as shown in FIG. After checking the interval timer (S11), the motor 26 rotates two seconds before the set time and the self-timer light emitting element (not shown) blinks at 8 Hz for two seconds, and then records (S12).
Then, track movement (S13) is performed. S11, 12, and 13 are repeated during the interval shooting mode.

When the DATE switch 58 is operated while the "INT" symbol 104 is blinking during the interval photographing operation, the interval photographing time is displayed on the display device 36 as shown in FIG. You.

When the switch 44 is turned on during the interval photographing operation (S14), the recording operation and the display are performed (S15, 16), and the interval time counted up to that time is reset (S17). Count up to the set time. After the interval shooting operation,
FIG. 10 shows a time chart in the case where the switch 44 is turned on after the automatic photographing is performed twice.

After the mode switch 54 is operated to set the normal photographing mode, or after locking or reproducing, the mode selecting switch 46 is operated again to set the normal photographing mode, or the magnetic disk 24 is taken out and loaded again. Thus, the interval shooting mode can be canceled by any method of setting the normal shooting mode. When the switch 44 is turned on in a state where the interval photographing time is not set, the above-described recording operation and display are performed, the normal photographing mode is set, and the “S” symbol 102 is displayed.

In any of the above modes, the switch 44
When the BLC switch 56 is operated at the same time as the operation described above, the captured image is backlit and recorded. When the flash switch 60 is turned on, the flash device emits light during photographing.

The operation and display at the time of reproduction and erasure will be described with reference to FIG. The reproduction mode is set by the mode selection switch 46, and the image recorded immediately before or the image recorded on the designated track is reproduced (S20). And I
Data such as date, hour, and minute recorded as D data is superimposed on the reproduced video signal as a character signal in accordance with the operation of the DATE switch 58, and output from the output terminal. That is, each time the DATE switch 58 is operated, the display of the track number, the date, the hour and the minute and the non-display are cycled. The track to be reproduced can be changed by the up switch 50 and the down switch 52.

If the track to be reproduced is not recorded, a mute signal is output from the output terminal 34. At this time, of course, the ID data is not displayed and the ID data is not reproduced. Even if the DATE switch 58 is operated, the display mode of the ID data is not changed.

When the flash switch 60 is operated during reproduction (S34), the mode is set to the interval reproduction mode, and the "INT" symbol 104 indicating the interval reproduction is displayed on the display device 36 as shown in FIG. The track number being reproduced is displayed by the character number 122.
In this mode, after reproducing for 3.5 seconds (S21), the magnetic head is moved to an adjacent upper recorded track (S22) and reproduction is performed (S23). Until the interval reproduction mode is canceled, S21, 22, and 23 are circulated. If there is no higher recorded track, the first
Play recorded tracks in order from the track. Therefore, when there is only one recorded track, only that track is reproduced. When there is no recorded track, the display of the "INT" symbol 104 disappears, and the interval reproduction is canceled.

The interval reproduction mode can be canceled by operating the flash switch 60, turning on the switch 42, operating the mode selection switch 46 again after setting the lock or recording mode, or the mode switch 54.
To operate.

During the playback including the interval playback, if all the switches 42 to 60 are not operated for three minutes (when the main power source is a battery) or six minutes (when the main power source is an AC power source) (S38). ), Power off automatically,
The reproduction is stopped (S39). Hereinafter, this is referred to as shut-off. At this time, as shown in FIG. 7A, the display device 36 displays the track number with the character number 122,
The interval playback mode is canceled.

To perform the reproduction again (S33), the switch 42 may be turned on (S37) or the mode selection switch 46 may be operated again after the lock or the recording mode is set.

A dedicated switch for setting the erase mode is not provided, and a plurality of switches used only in the recording mode are simultaneously operated during the reproduction mode to set the erase mode. That is, by simultaneously operating the switches 42 and 44 and the mode switch 54 during reproduction (S35), the reproduced image is muted (S40), and the track being reproduced is deleted (S2).
5). By further pressing (S26), the magnetic head 28 is moved to the next inner track (S27), and that track is erased (S25). During this time, the display device 3
6 is displayed when the mode switch 54 is operated.
The display becomes as shown in (3), and the reproduced image continuously muted is output to the terminal 34 and displayed on a monitor (not shown).

Simultaneously operating the switches 42 and 44, the mode switch 54 and the BLC switch 56 (S36)
As a result, the all track erase mode is set. That is, after the reproduction image is muted (S41), the magnetic head 28 moves to the innermost 50th track (S28) and continuously erases from the 50th track to the 1st track (S29, 3).
0, 31). After erasing to the first track, the power is turned off and shut off (S32). Once the switches 42 and 44, the mode switch 54 and the BLC switch 56 are operated simultaneously, they may be released thereafter. At this time, the display on the display device 36 indicates the switches 42, 44, 5
At the point in time when there are 4, 56 simultaneous operations, the display becomes as shown in FIG.

The all-track erasing mode is set by operating the switch 42 (S44) (between S42 and 43) or
After the lock or the recording mode is set, the mode is released by operating the mode selection switch 46 again. If the switch 42 is operated while erasing a track, "
The "ALL" symbol 118 disappears, and the display shown in FIG.
This makes it possible to know that the all track erase mode has been released. Thereafter, after the erasure of the track being erased is completed, the display on the display device 36 changes to the display of FIG. 7A, and the continuously muted playback image is output to the terminal 34 and displayed on the monitor (not shown). I do. In addition, the switch 42
Is operated, the display on the display device 36 immediately changes to the display of FIG. 7A.

A recording prevention measure can be taken on the magnetic disk 24. In this case, when the above-described erasing operation is performed, the display device 36 performs a display as shown in FIG. 8 (1) or (2). No erasure is performed.

When the main power supply voltage drops to a predetermined voltage, the battery symbol 114 is turned on and off to warn the user of this voltage. This voltage inhibits all track erasure. That is, when an operation of erasing all tracks is performed at a voltage lower than this voltage, the display device 36 displays as shown in FIG. However, if the above-mentioned voltage is reached during the execution of all track erase, the erase is continued.

When the voltage of the main power supply further decreases and reaches a predetermined voltage, erasure of one track and continuous erasure are prohibited. In response to the erasing operation, the display device 36 displays the display shown in FIG.

Next, setting of a clock for recording ID data will be described. In the recording mode by the mode selection switch 46 (except during the interval recording operation) or in the reproduction mode by the mode selection switch 46 when the magnetic disk 24 is not loaded, the DATE switch 58
Is operated, a "Y" symbol indicating the year of the symbol 110 is displayed on the display device 36, and the numerical value of the year is displayed in the character number 122. Every time the DATE switch 58 is operated, the display changes to month display, day display, time display, minute display, and normal display. As a result, the current date and time can be confirmed. Up switch 50 and down switch 52
Can change the numerical value, for example, as shown in FIG. 9 (2), the corresponding symbol among Y, M, D, H and M blinks. If the above operation is performed during the interval time display (the interval time is not set and the setting is displayed), the normal photographing mode is set.

If all the switches are not operated for about one minute while the date and time are displayed, the display switches to the normal display. Also, the voltage drop of the main power supply, the mode selection switch 46
Operation, and the loading / unloading of the magnetic disk 24, the normal display is also displayed.

Next, referring to FIG.
The state detection operation of No. 32 will be described. FIG. 14 shows an operation flowchart of the system control circuit 38. In the system standby state, the terminal S of the sensing switch 132 is set to low (L) to detect the level of the terminal B, and the terminal S is immediately returned to high (H) (S200). At this time, if the terminal B is high (H), it is determined that the lid of the battery compartment is open (or not completely closed), and the processing of the countermeasure (for example, a predetermined warning display or the like) is performed. Perform (S222). If the terminal B is low, a key scan of the switch group 40 is performed (S201), and if there is a key input, a corresponding process is performed. If the process does not require a power supply (S202), the process is executed as it is (S2).
20), and return to S200. In the case of a process that requires a power supply (S202), the terminal S of the sensing switch 132 is set to low (S203), and an interrupt is permitted according to the rising of the terminal B (S204), and the regulator 134
Is turned on (S205), and a process corresponding to the key input is executed (S206). After the processing is completed, the regulator 134 is set to the non-operation state (S207), the interrupt is prohibited (S208), the terminal S of the sensing switch 132 is set to high (S209), and the process returns to S200.

In FIG. 14, when the lid of the battery chamber is opened during execution of the process (S206), the sensing switch 132 is turned off, and the terminal B of the sensing switch 132 which has been low becomes high. The rise causes an interruption (S221), and the process at the time of opening the lid of the battery chamber is executed (S222).

Although the electronic still camera in this embodiment uses a still video floppy as a recording medium, it may be a tape-shaped medium, an optical recording medium, or a solid-state memory such as a semiconductor memory. Although an electronic still camera has been described as an example, it goes without saying that the present invention can be applied to other battery-driven electric devices.

[0043]

As can be easily understood from the above description, according to the present invention, the movable piece is located at the end of the moving range.
Power-off mode (first operation mode) for the first selection contact
The movable piece switches to one of the selection contacts.
Power off mode by mistake when
Will not be recognized. The movable piece is in the middle position
If you mistake the power-off mode when the
Each part of the device changes from power on to power
And then the transition from power off to power on.
This allows the user to select the operating mode that the user actually selects.
Operation slows down or malfunctions in each part
In the present invention, such adverse effects are eliminated.
It becomes.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram of the overall configuration of an electronic still camera.

FIG. 2 is an explanatory diagram of all display contents of a display device 36.

FIG. 3 is a flowchart of an operation and a display operation during recording.

FIG. 4 is a flowchart of a reproduction and erasure operation and a display operation.

5 is a display example of a display device 36. FIG.

6 is a display example of a display device 36. FIG.

7 is a display example of a display device 36. FIG.

8 is a display example of a display device 36. FIG.

9 is a display example of a display device 36. FIG.

FIG. 10 is a time chart at the time of interval shooting.

FIG. 11 is an external view of the apparatus.

FIG. 12 is a configuration block diagram of a characteristic portion of the present embodiment.

FIG. 13 is a configuration block diagram of a conventional example.

FIG. 14 is an operation flowchart of the present embodiment.

[Explanation of symbols]

10: Photographing lens 12: Mechanical shutter 14: Shutter drive circuit 16: Image sensor 18: Process circuit 2
0: Recording circuit 22: Switch 24: Floppy 2
6: Motor 28: Magnetic head 30: Erase circuit 3
2: reproduction circuit 34: video output terminal 36: liquid crystal display device 38: system control circuit 40: switch group 4
2: First release switch 44: Second release switch 46: Mode selection switch 50: Up switch 52: Down switch 54: Mode switch 56: BLC switch 58: DATE switch
60: Flash switch 70: Motor drive circuit
72: sensing switch 74: system control circuit 13
0: Battery 132: Sensing switch 134, 136: Regulator 138, 140: Diode 142: Debug control signal output terminal

Claims (5)

(57) [Claims] (1)By operating the movable piece, the first, second and third
Switch that can be connected to a single common contact.
Switch means, wherein the first and second selection contacts are
Switch means located at both ends of the movable range of the movable piece, Detecting the electrical state of the first, second and third selection contacts.
Detection means; According to the detection result of the detection means, the first selection contact is
At a predetermined potential, it is determined that the first operation mode has been selected.
When the second selection contact is at the predetermined potential.
It is determined that the second operation mode is selected,
And the second selection contact is not at the predetermined potential.
Operation mode determination for determining that the third operation mode has been selected
Means, wherein the first operation mode is a power-off mode.
Is An image recording / reproducing apparatus characterized by the above-mentioned. 2. The method according to claim 1, wherein the third operation mode is a reproduction mode.
The image recording / reproducing apparatus according to claim 1. 3. The recording apparatus according to claim 2, wherein the second operation mode is a recording mode.
The image recording / reproducing apparatus according to claim 1. 4. The operation mode determining means according to claim 1, wherein:
And both the second selection contacts are at the predetermined potential.
And determining that the fourth operation mode is selected.
The image recording / reproducing apparatus according to claim 1. 5. The debugging mode according to claim 4, wherein the fourth operation mode is a debug mode.
The image recording / reproducing device according to claim 4, wherein