JPH03121674A - Electronic camera - Google Patents

Abstract

PURPOSE:To obtain an electronic camera with small size which uses an external power supply offering convenience of use by adopting the constitution such that the reproduction is selected automatically when the external power supply is used for the operation and the selection of the recording mode is inhibited. CONSTITUTION:The camera consists of an electronic camera main body 30 including a CPU 10, a power saving control circuit 26, and a DC/DC converter 27 and of a power supply section 31 detecting whether or not the electronic camera is in battery operation or an external power supply operation (AC adaptor). Whether the electronic camera is in battery operation or in external power supply (AC adaptor) operation is detected, the reproduction mode is selected automatically and the recording mode selection is inhibited when the external power supply is in use. Thus, the electronic camera with small sized and with an external power supply offering convenience of use is realized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electronic camera that performs recording and reproduction by battery power and also uses an AC adapter.

[Prior Art] Figure 4 shows an RII diagram of a conventional example of the electronic camera as described above.
This shows a three-dimensional configuration diagram.

In Fig. 4, first set the mode switch 1 to the recording side and turn on the power switch 4 to put the camera into recording mode, then start charging the strobe 5. Next, press the zoom switch 2 and the camera will start zooming. and decide on the framing.

Furthermore, trigger switch (two-stage push switch) 3
When the 01st step is pressed, the spindle motor 21a starts rotating and becomes steady rotation. At this time, the AF sensor 9 measures the distance to the subject, and based on this data, the CPU 10 drives the AF motor 6a to focus. At the same time, a photometric sensor 11 and a point balance sensor 12 measure the brightness and color crystallinity of the subject and send the data to the CPU 10.

After all the above conditions are met, trigger switch 3-2
The first step is received and 4J is received. When this second step is pressed, C
The CD driver 15 starts driving the CCD 14, and the light incident through the lens 6.8 is photoelectrically converted and sent to the imaging process circuit 16. At this time, the shading value and the shutter value are determined from the photometric data, and the CPt 110 drives the shading drive motor 7a accordingly.

Further, the shutter speed is determined by changing the accumulation time of light accumulated in the CCD 14 and the CC driver 15.

The signal thus found is subjected to signal processing in the image capturing process circuit 16 based on the data from the white balance sensor 12, and is sent to the modulator 17. Modulator 17
After FM modulating the input signal, it is amplified by the recording amplifier 18, electromagnetically converted by the magnetic head 20, and output to the magnetic disk 21.
recorded in When the CPU determines that it is dark based on the side-lit data during this recording, the strobe 6 is made to emit light during the storage time of the CCD 14.

Next, the playback operation will be explained. First, mode switch 1
By setting the playback 11F1 and turning on the power switch 4, the camera enters the playback mode. At this time, by rotating the spindle mode 21a and achieving steady rotation,
The signal recorded on the recording sheet 21 is read out by the magnetic hand 20, amplified by the recording amplifier 22, and sent to the demodulator 23. The demodulator 23 demodulates the recorded FM signal, and the reproduction process circuit 24 processes the signal and converts it into a video signal that can be viewed on a television monitor.

Also, if the frame advance switch 4b is pressed at this time, the CPU
Reference numeral 10 drives a head access motor 20a to change the reproduction track.

In the above-described recording/reproducing operation, the external power supply (AC adapter) supplied from the battery or DC jack to the terminal ``■'' is stabilized by the DC/DC converter 27, and power is supplied to each circuit. At this time, the CPU 10 performs power saving control via the power saving control circuit 25 so that each power supply supplies power to the circuitry necessary for the recording system during recording and to the circuitry necessary for the reproduction system during playback.

Also input to the DC/DC converter 27,
The power source voltage is constantly checked by the power source voltage detection circuit 28, and energy saving processing is performed in which the power is turned off when the voltage reaches a point where the system is likely to go down.

In addition, in FIG. 4, 19 is a recording synchronization signal generation circuit;
25 is a reproduction synchronization signal generation circuit.

[Problem U to be solved by the invention] Compared to the dissipation current (500 ~ (ioolA)) required during playback in the camera system as described above, the strobe is not charged during recording, and the AF sharpening drive motor and shade are A large current is required to energize the COD and drive the COD.

In particular, charging a strobe requires a large current, and a current of several A or more is required to charge the strobe in order to emit enough light to satisfy the zoom function.

In this system, in order to satisfy the number of images to be taken over 500, a battery such as a NiCd battery, which has relatively little voltage lag even if a large current can be accommodated as a load, is used.

In addition, since the time that such a system can be powered by battery is limited, an external power supply (ACC power supply) is required.
You will need a system that can be used in

At this time, an external power source capable of recording and reproducing has an output current of several amperes or more for charging the strobe light, resulting in a large external power source.

On the other hand, since electronic cameras are designed to be compact with emphasis placed on portability, a large external power supply cannot balance the system, and the smaller the power supply, the smaller the output current, so the electronic camera cannot be used in recording mode. If an attempt is made to use it, the above-mentioned power supply voltage detection circuit will be activated, resulting in a problem that the system will be inconvenient to use.

This invention has been made to solve the above problems, and its purpose is to provide an electronic camera that uses a small external power supply (AC adapter) and is easy to use.

[Means for Solving the Problems] The present invention is an electronic camera that performs recording and playback by battery drive, and is configured to automatically enter playback mode when operated using an external power source and prohibit switching to record mode. It is characterized by what it did.

[Function] With the above configuration, it is possible to detect whether this electronic camera is running on a battery or an external power source (AC adapter), and when it is on an external power source, it automatically enters only playback mode, making it compact and easy to use. can be taken as a thing.

[Example] Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

Figure 1 shows whether the electronic camera is powered by a battery or an external power source (
This figure shows the configuration for detecting whether the AC adapter is in operation, that is, the configuration of the power supply section 31.

The internal configuration of the electronic camera body 30 is almost the same as that shown in FIG. 4, with 10 representing a CPU, 26 a power saving control circuit, and 27 a DC/DC converter circuit.

Further, in FIG. 4, 32 is a connection terminal for the pantry 33, and 34 is a DC jack that receives the AC adapter connection plug 35.

The DC jack 311 has a central connection terminal 34a for contacting the AC adapter connection plaque 35 and contacts 34b and 3 on both sides.
4c, and these contact points 34b and 34c on both sides are A
The C-adapter connection glove 3 is structured to be separated when it is inserted. And both sides contact 3
One terminal of 4b is connected to D of Ill of the electronic camera body 30.
Terminal 'F connected to the input terminal of the C/DC converter 27
The other terminal is connected to the connection terminal 32. Also, one terminal of the contact points 34c on both sides is connected to the central connection terminal 34a and kept at zero potential, and the other terminal is connected to crt+io by the battery/adapter detection signal line l.
It is connected to the.

This signal line 1 is connected to a DC power source via a resistor 36.

However, when the camera is operated on a battery, the voltage of the battery 33 is applied to the DC/DC converter 27 via the contacts 34b on both sides and the terminal T. At this time, A
C adapter connection plug 35 is not inserted, contacts 34b on both sides
, 34c are in contact, so the battery/
The adageter detection signal line 1 passes through the contacts 34c on both sides and is connected to the snow removal tq.
In other words, it is in the L state.

Therefore, it is thereby possible to detect that the power supply section 31 is in the battery operation state.

In addition, if the camera is operated using an external power supply (adapter),
By inserting the C adapter connection glove 3, the AC
The adapter voltage is applied to the DC/DC converter 27, and at this time both contacts 34b and 34c are in the open state, so the battery 33 is disconnected and the battery/adapter detection signal line 1 is away from zero potential and becomes a floating state. . Therefore, the voltage on the DC power supply appears on this signal line 1 as it is, and becomes an H state. Therefore, it is thereby possible to detect that the power supply section 31 is in the state of external power supply operation.

As described above, since it is possible to detect whether the power supply unit 31 is in a battery operation state or an external power supply operation state, cpulo performs the following operations.The power-on reset routine (Figure 2) In the flowchart of FIG. 2, (1) Initialization refers to initializing the internal state of the PU 10 and maintaining the interface with the bending circuit block in the initial state.

■ Detects the power supply voltage, and if the voltage level is at a level that is likely to cause the system to go down (NG), energy-saving processing is performed. If OK "C", go check the power switch.

(2) Energy saving processing means putting CPIllo into the above-mentioned initialized state.

■ I'm watching to see if the power switch is pressed, and when it is, I'm checking to see if the adapter is detected. If it is not pressed, it will stop ■ The power supply voltage detection and power switch detection are repeated.

■ Detects whether it is an adapter (external power supply) or a battery. If it is an adapter, it goes to P[^Y off operation, and if it is a battery, it goes to mode switch detection.

■ Perform mode switch detection and P[ΔY is i1! i
If RFC is selected, proceed to PLAY operation, and if RFC is selected, proceed to REC operation.

In this routine, if it is an adapter in the branch (■), when the power switch is pressed, the P[^Y off operation will not be performed regardless of which mode switch is set.

(PLAY operation routine (Figure 3)) ■ Detects the power supply voltage, and if NG, moves to energy saving processing and turns off the power.

■ Detects whether the power switch is turned off.

When turned off, power off processing is performed.

■ Power-off processing is the initialized state of the power-on reset routine.

■ Detect whether it is a battery or an adapter. If it is an adapter, proceed to P[^Y processing; if it is a battery, proceed to mode switch detection.

■ Detects the mode switch, and if it becomes RFC, R
If it goes to FC operation, or to PI8, it continues P1^Y processing.

■ Continuing to output the video signal, and performing each PLAY process such as moving the track when the frame advance switch is pressed.

During P[^Y operation, the above routine is always repeated, so when operating with an adapter, P[^Y operation does not proceed to REC operation even if the mode switch is changed.

As described above, when operating with an adapter, it is possible to automatically switch to the playback mode and prohibit the switch to the recording mode.

[Effects of the Invention] According to the present invention, it is possible to provide an electronic camera that uses a small external power source and is easy to use.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a jIA schematic topology of an embodiment of the present invention, FIGS. 2 and 3 are flowcharts 1 and 3 showing the operation routine of the present invention, and FIG. 4 is a flowchart of a conventional electronic camera. It is a block diagram showing an example. 10... CPU 26... Power saving control circuit 27... DC/DC converter 30...
Electronic camera body 31...power supply section 32...
・Connection terminal 33...Battery 34...D
CC gear 34a...center connection terminal 34b, 34
c... Contacts on both sides 35... AC adapter connection plug controller Figure 2

Claims (1)

[Claims] An electronic camera that performs recording and playback by battery drive, characterized in that the electronic camera is configured such that when operating using an external power source, the camera automatically enters a playback mode and prohibits the switch from entering a recording mode.