JP2873848B2 - Still video camera - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a still video camera, and more particularly, to an improvement in a recording operation of a still video camera having a detachable remote controller.

<Related Art> In recent years, instead of a conventional film camera, a light image signal from a subject is converted into an electric image signal by an image sensor, and the electric image signal is converted into a recording medium such as a magnetic disk corresponding to a conventional film. Still video cameras having a configuration for recording in a video camera have been put to practical use.

On the other hand, some silver halide film cameras have a detachable remote control provided on the camera body so that the remote control can perform photographing (hereinafter referred to as remote control photographing).

<Problems to be Solved by the Invention> However, in the case of a camera equipped with the above remote control, if the surrounding light is dark and a strobe is required when shooting with the remote control, the charge of the strobe is started by turning on the release switch of the remote control. There is a time lag between the photographing timing and the actual photographing, so that the actual photographing is delayed.

In addition, if the strobe is always charged, a charging current always flows, which wastes power and reduces the number of shots.

On the other hand, when photographing with a remote controller, the photographer does not know whether the release switch is OFF or not, so that an out-of-focus photograph is often taken.

Therefore, even when the still video camera is provided with a remote control, the same problem occurs when the remote control method of the silver halide film camera is directly quoted.

SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional problem, and in remote shooting of a still video camera provided with a remote controller, it is determined whether or not a strobe is necessary when the remote controller is detached from the still video camera body. It is an object of the present invention to provide a still video camera which solves the above-mentioned problem by charging the strobe by making a judgment.

<Means for Solving the Problems> For this reason, as shown in FIG. 1, the present invention provides a detachable remote controller for a camera body, and a remote controller detachable detector for detecting the detachment of the remote controller. And a strobe charging means for charging the strobe, and a light meter for the strobe to charge the strobe when the remote control attachment / detachment detection means detects that the remote control has been removed from the camera body. Charge control means.

<Operation> In this configuration, when it is detected that the remote controller has been detached by the remote controller attachment / detachment detection unit, the light metering unit detects the brightness of the surroundings according to a command from the charging control unit. The strobe charging means charges the strobe.

<Example> Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 2 shows the appearance of the still video camera according to the present embodiment.

In the figure, a still video camera S with a remote controller 9 set has a release switch 1, a photographing lens 2, a finder lens 3, a photometric lens 4, a light receiving lens 5 of the remote controller 9, and an LED 6 for displaying a self-timer. ,
A flash dimming lens 7, a strobe 8, a display liquid crystal 10 for various functions are provided, and a floppy disk 11 as a recording medium is inserted from an insertion hole formed on a side of the still video camera S hidden in the figure. It has become.

FIG. 3 shows a state in which the remote controller 9 is detached from the still video camera S. The remote controller 9 includes a transmission switch 12 and an infrared light emitting LED 13 for transmitting a modulated light signal.

FIG. 4 is a system block diagram of the still video camera S.

In the figure, light passing through a photographing lens 2 is
After being incident on the CCD 23 through the optical filter 22 and converted into an electric signal, and then sampled and held through the sample and hold circuit 24, the signal processing circuit 25 performs gamma correction and Y /
Signal processing such as C separation and white balance adjustment is performed.
The processed signal is FM-modulated by the conversion circuit 26 and then magnetically recorded on the floppy disk 11 by the recording amplifier 27 and the recording / reproducing head 28.

Here, the timing generation circuit 29 includes the CCD drive circuit 30, the sample and hold circuit 24, the signal processing circuit 25, and the modulation circuit.
26, outputs necessary pulses to the recording amplifier 27.

The photographing lens 2 and the aperture 21 are controlled by an aperture / lens drive circuit 32 controlled by a main CPU 31. Further, the floppy disk 11 is rotated at a constant speed of 3600 revolutions per minute by the spindle motor 33 and the servo circuit 34.

The main CPU 31 controls the entire system and controls power supply to each unit. The sub CPU 35 displays the display liquid crystal (LCD) 10 and inputs signals from various switches described later.

The distance measuring circuit 81 measures the distance to the subject by using a light receiving element such as an infrared LED and a PSD.

The photometric circuit 36 measures the brightness of the subject using the photodiode.

The dimming circuit 37 integrates the reflected light of the strobe light from the subject, and notifies the main CPU 31 of the proper exposure.

As is well known, the strobe circuit 38 includes a booster circuit and a capacitor, and charging and discharging are controlled by the main CPU 31.

The remote control signal receiving circuit 39 detects the modulated optical signal and sends it to the main CPU 31 as a digital signal.

For reproduction, the signal recorded on the floppy disk 11 is electromagnetically converted by the recording / reproducing head 28, amplified by the reproduction amplifier 40, FM-demodulated by the demodulation circuit 41, processed by the signal processing circuit 42, and then processed by the encoding circuit 43. It outputs a video signal more.

The recording / reproducing head 28 can be moved to an arbitrary track by the main CPU 31 via a head control circuit 82.

The entire camera is powered by the battery
A DC voltage obtained by converting a DC voltage or an AC voltage from 45 by an AC adapter 46 is supplied through a power supply control 47,
While being supplied to the main CPU 31, the DC / DC converter 48
It is supplied to each unit via a 5V constant voltage circuit 49.

When the remote controller 9 is removed from the camera body,
N, the main CPU 31 can detect the attachment / detachment of the remote controller 9 by the detection switch 50 which is turned off when the remote controller 9 is mounted.

That is, the detection switch 50 constitutes a remote controller attachment / detachment detection unit.

Next, an operation unit and a display unit of the camera will be described with reference to FIGS.

When the slide switch 51 is OFF, power is not supplied to the camera, nothing is displayed, and all switches are not accepted. REC, PLAY, ERASE, REC with the slide switch 51
By selecting & PLAY, a shooting mode, a playback mode, an erasing mode, and an automatic shooting / playback mode are switched.
FIG. 5 shows a state in a shooting mode in which the slide switch 51 is set to REC.

Next, the function of each switch in the shooting mode will be described.

Every time the mode switch 52 is pressed once, the black triangle mark 53 on the left side of the display window changes from SINGLE to CONT.L to CONT.H to SE.
By moving to LF, you can switch between single shooting, low-speed continuous shooting, high-speed continuous shooting, and self-timer modes. When the mode switch 52 is further pressed from the SELF position, the triangle mark 53
Returns to the SINGLE position again.

The flash switch 54 is a switch for changing the exposure mode, and switches between a flash automatic flash mode, a flash forced flash mode, a flash OFF mode, an AE lock mode, and a bracket shooting mode. That is, every time the strobe switch 54 is pressed once, a black triangle mark 55 on the right side of the display window is displayed.
Moves from AUTO → ON → OFF → AE LOCK → BRACKET and displays which mode is selected.

The macro switch 56 is a switch for switching the photographing lens 2 between the close-up photographing position and the standard photographing position, and accepts only when pressed for 0.5 second or more so as not to switch when carelessly touched. When the close-up photographing mode is selected, the photographing lens 2 moves to the close-up photographing position, and a flower mark 57 is lit at the upper left of the display window.

The interval switch 58 is a switch for switching and setting to the interval photographing mode. Every time the interval switch 58 is pressed, the setting of the hour, minute, and second of the interval interval and the setting of the number of photographed images can be performed.

When setting each value, press the mode switch 52 and the strobe switch 54 to increase or decrease the number,
Thereby, the numerical value is changed. Similarly to the macro switch 56, the interval switch 58 is switched to the interval shooting mode only when pressed for 0.5 second or longer, and the INT mark is lit on the display window.

The date switch 59 switches the date display mode. Each time the date switch 59 is pressed, the display changes from month / day / year to day / month / day.
It changes in the order of year → year / month / day → day / hour / minute → no display.

The adjustment switch 60 is a switch for switching to a change mode and selecting an item to be changed when the date or time is changed. The year, month, day or hour and minute information selected by the adjust switch 60
A change is made by moving up and down with 52 and the strobe switch 54.

When the slide switch 51 is set to the erasing mode, the word "ERASE" is displayed on the display window as shown in FIG. In this state, when the track to be erased is selected by the mode switch 52 and the flash switch 54 and the release switch 1 is pressed, the track is erased.

When the slide switch 51 is set to the reproduction mode, the character "PLAY" is displayed on the display window as shown in FIG. 7, the recorded state of the floppy disk 11 is detected, and the recording / reproducing head 28 is moved to the recorded outermost track. FIG. 7 shows an example of recording from the first track, so that track number 1 is displayed. When release switch 1 is pressed in this state,
The first track is reproduced. The track feed is performed by increasing or decreasing the track number by the mode switch 52 and the strobe switch 54. The automatic shooting / playback mode is a mode in which the mode is automatically switched to the playback mode immediately after shooting, and is automatically switched to the shooting mode again after playing for a certain period of time.

Next, control of flash photography by the main CPU 31 when the remote controller 9 is removed from the still video camera S when the exposure mode is the flash automatic light emission mode will be described with reference to a time chart shown in FIG.

First, when the remote controller 9 is removed from the still video camera S, the detection switch 50 is turned off (FIG. 8 (a)), and the sub CPU 35 detects that the remote controller 9 has been removed, and transmits this to the main CPU 31 serially. By doing so, the main C
The PU 31 starts supplying power to the remote control receiving circuit 39 to enable reception of a remote control transmission signal (FIG. 8 (b)).

Then, the photometry circuit (AE) 36 is operated (FIG. 8 (c)) to detect the surrounding brightness.
Is charged (FIG. 8 (d)).

That is, the photometry circuit (AE) 36 constitutes photometry means, the strobe circuit 38 constitutes strobe charging means, and the strobe automatic charge control function in which these means are operated by the main CPU 31 constitutes charge control means.

At this time, the self-timer display LED 6 is blinked to notify the user that the flash 8 is being charged (FIG. 8 (e)).

Thereafter, when the user operates the transmission switch 12 of the remote controller 9 again, a signal of light modulated by the infrared light emitting LED 13 is transmitted to the camera, and is received (FIG. 8 (f)). One sequence described later is executed. At this time, an LED 6 for displaying a self-timer is turned on in synchronization with the execution of the one sequence in order to inform the user that one sequence is operating, in other words, that the photographing is being executed (8th embodiment). Figure (g)).

That is, the lighting control function of the LED 6 and the LED 6 by the main CPU 31 constitutes a shooting execution specifying unit.

Next, one sequence of photographing will be described based on the time chart shown in FIG. Note that the time chart shown in FIG. 9 is not the operation of the remote controller 9 but one sequence by the release operation of the main body of the still video camera S.

The press operation of the release switch 1, the power supply in synchronism with the ON of the switch S ₁ to be ON at a first stroke of movement of the half-pressed state is turned ON, thereby rotating the floppy disk 11 as ON the spindle motor 33.

Next, the brightness and the distance (AE / AF) of the subject are measured, and the lens 2 is moved to perform focusing.

Synchronization with the second ON switch S ₂ to be ON by a second stroke of movement of the substantially fully-pressed state of the release switch 1 stop
21 is set, the electronic shutter of the CCD 23 or the like is opened, the subject is photographed, and the charge of the CCD 23 is accumulated.

After that, the PG
The recording gate is turned on in synchronization with the signal, and after this charge is read out and subjected to signal processing, the signal is FM-modulated and the video signal is recorded on the floppy disk 11.

Thereafter, the recording / reproducing head 28 is sent (track feed) to prepare for the next recording.

Above operation from a series of ON of the switch S ₁ described until OFF is 1 sequence of the shooting, the operation is to operate the remote control signal as described above.

In this way, it is determined whether or not a strobe is required for remote control shooting by performing photometry when the remote controller 9 is detached from the still video camera S main body. Since it becomes possible for the user to determine the timing of shooting by turning on,
There is no waste of power, and it is possible to prevent taking out-of-focus photos.

It should be noted that what has been described above is a flash 8 based on the photometric result.
When the flash switch 54 is set to the flash forced flash mode, the remote controller 9 is unconditionally charged when the remote control 9 is removed, and the flash OFF mode, AE
In the lock mode and the bracket mode, charging is not performed unconditionally.

<Effects of the Invention> As described above, according to the present invention, it is determined whether or not a strobe is necessary for remote control shooting by performing photometry when the remote control is detached from the still video camera body,
Since the control structure is configured to charge the strobe and notify the photographing timing, waste of power can be prevented, and photographing of an out-of-focus photograph can also be prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of the present invention, FIG. 2 is a perspective view of a still video camera according to one embodiment of the present invention with a remote controller set, and FIG. FIG. 4 is a system block diagram of the same still video camera, FIGS. 5 to 7 are plan views showing operation / display units in the still video camera in various modes, FIGS. 8 and FIG. 9 is a time chart showing a signal state of each part at the time of control according to one embodiment of the present invention. 1 Release switch, 2 Lens, 21 Aperture, 8 Strobe, 9 Remote control, 31 Main CP
U, 36: photometric circuit, 38: strobe circuit, 50: detection switch

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G03B 15/05 G03B 17/38 H04N 5/225 H04N 5/238

Claims (1)

(57) [Claims] 1. A still video camera, wherein a detachable remote controller is provided on the camera body, a remote controller attachment / detachment detecting means for detecting attachment / detachment of the remote controller, a photometric means for measuring ambient brightness, and a strobe for charging the strobe. Charging means; and charging control means for charging the strobe by performing photometry by the photometric means when the remote control detachment detecting means detects that the remote control has been removed from the camera body. Still video camera.