JPH0746848B2 - Imaging device - Google Patents

Description

The present invention relates to an image pickup apparatus, and more particularly to an image pickup apparatus capable of shooting and reproducing from a recording medium using a portable power supply.

[Prior Art] Generally, when portability such as shooting is taken into consideration, it is more advantageous to use a battery as a power source than to use a commercial power source because the portable part can be downsized and can be used in a cordless manner. is there. Therefore, conventionally, many image pickup apparatuses that can use a battery as a power source have been proposed.

On the other hand, there has been proposed an image pickup apparatus in which an image reproduction function is added to the image pickup apparatus and a reproduction adapter can be connected. Such an image pickup apparatus is very advantageous because the photographer can confirm or appreciate the photographed image by reproducing the image on the spot of photographing.

[Problems to be Solved by the Invention] However, in such an image pickup apparatus, particularly an image pickup apparatus for still image shooting, the time during which power is supplied to the image pickup apparatus at the time of shooting and the time during which the shot image is reproduced and viewed. In addition, the latter is usually longer than the time when power is supplied to the reproducing unit.

Therefore, the power consumption amount at the time of shooting is not so large because the shooting time of one frame image is short, and even an imaging device using a battery as a power source does not pose a problem in practical use. Since the energization time during reproduction tends to be long, there is a problem that the battery consumption is fast in an image pickup apparatus capable of image pickup and reproduction using a battery as a power source.

It is an object of the present invention to solve the above conventional problems and suppress the consumption of the battery during reproduction.

[Means for Solving the Problems] In order to achieve such an object, the present invention provides a storage means for storing an image in an imaging device capable of capturing an image using a portable power supply and reproducing the image from the storage means. Driving means for driving the storage means, reproducing means for reproducing an image from the storage means, power feeding means for selectively feeding power to the driving means from a portable power source and an external power source,
Control means for stopping power supply to at least the driving means in response to a lapse of a predetermined time after the reproducing means continuously starts reproducing images on the same screen, and the driving means from the portable power source. A first mode in which power is supplied to the control means and the control means is in an operating state; and a second mode in which power is supplied to the drive means from the external power source and the control means is in an inactive state. It is characterized by having.

[Operation] According to the present invention, when an image is reproduced from a recording medium by using a portable power supply, at least the driving means for the recording medium is operated at least in accordance with a lapse of a predetermined time from the start of reproducing the image on the same screen. Since power supply is stopped, it is possible to suppress power consumption related to image reproduction.

EXAMPLES The present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, in which 1 is an image pickup device such as a CCD, 2 is a signal processing circuit for image pickup, and 3 is a recording circuit. Reference numeral 4 is a switch circuit, and when the input signal to the terminal 4a is at a high level, between the terminals 4b and 4d is at a low level.
Conduction between 4c and 4d switches the flow of image signals. Reference numeral 5 is a recording / reproducing head, 6 is a recording medium, 7 is a servo circuit for driving the medium 6, and when the medium 7 is a disk, a motor for rotating the disk, and the medium 6 is a tape. In some cases, it also includes a motor for driving the tape and a head for recording or reproducing on the tape. Reference numeral 8 denotes a controller that controls each unit of the image pickup apparatus. The servo circuit 7 receives the timing signal generated by the controller 8 from the terminal 7b, drives the medium in synchronization with it, and outputs a low level signal from the terminal 7c when the driving is stable, and a high level signal otherwise. Output. Terminal
Reference numeral 7d is a control terminal. When the input to this terminal is at a low level, the servo circuit 7 is not supplied with power and is prevented from operating.

Reference numeral 9 is a switching circuit including a shooting / playback mode switch, which outputs a low level signal in the playback mode and a high level signal in the shooting mode. Reference numeral 10 denotes a track feed switch. When the switch is pressed once, a high level signal is output for a moment, and in response to this, the head 5 is moved by one track.

An OR circuit 11 receives the output signals of the track feed switch 10 and the servo circuit 7. Reference numeral 12 denotes a timer, which is ORed when the terminal 12a for receiving the signal from the photographing / playback switching circuit 9 is at a low level, that is, in the playback mode.
The output terminal 12c becomes low level when a predetermined time elapses after the reset terminal 12b that receives the OR output of the circuit 11 falls to low level. Further, when the terminal 12b becomes high level again before the elapse of the predetermined time, 12c becomes the low level again after the elapse of the predetermined time from the subsequent falling time point. Before the elapse of the predetermined time, the terminal 12c is at the high level.

A signal processing circuit 13 for reproduction receives the output of the head 3 at the input terminal 13a via the switch 4, and a video signal for reproduction is obtained at the output 13b. Reference numeral 13c is a control terminal, and power is supplied to the signal processing circuit 13 to operate only when the input signal to the terminal 13c is at a high level.

In this example, the output terminal 12c of the timer 12 and the control terminal 7d of the servo circuit 7 and the control terminal 13c of the signal processing circuit 13 are connected to each other so that the timer 1
The power supply to the servo circuit 7 and the signal processing circuit 13 which consumes a large amount of power is stopped after the lapse of a predetermined time counted by 2. Here, in order to supply and stop the power supply to the servo circuit 7 and the signal processing circuit 13 according to the timer output, for example, according to the high / low of the timer output to the respective power supply lines for the respective units 7 and 13. It is sufficient to provide a switch or a gate circuit that closes / opens by closing. Further, in accordance with the switching of the shooting / playback circuit 9 to the playback mode, the respective parts 7 and 13 are energized via the timer 12, that is, the connection line between the terminal 12c and the terminals 7d and 13c is powered. It is easy to make a line. Further, in this example, the servo circuit 7 and the signal processing circuit
Although the power supply of 13 is stopped, it is also easy to turn off the main power switch S of other parts or devices. Further, in the present embodiment, since the power consumption of the servo circuit 7 including the motor is large, it is possible to reduce the power consumption only by stopping the power supply to the servo circuit 7. In such a case, just before the power supply to the servo circuit 7 is stopped, the reproduction signal from the medium 6 is stored in a solid-state memory such as a semiconductor memory, and the signal processing circuit 13 is continuously supplied with power to reduce the power consumption. Instead, the playback operation can be continued.

Next, the operation of the image pickup apparatus configured as shown in FIG. 1 in the shooting mode and the reproduction mode will be described.

(I) Shooting mode When the apparatus is switched to the shooting mode by operating the mode selection switch of the shooting / playback mode switching circuit 9, the switching circuit 9
Output becomes low level, and switch circuit 4 has terminals 4b-
There is continuity between 4d. On the other hand, when the main power switch S is turned on and the shutter is released in this state, the optical system and the exposure control device (not shown) work to expose the CCD 1 and then the signal processing circuit 2, the recording circuit 3, the switch circuit. Signals are transmitted via the recording medium 4, and recording is performed on the medium 6 by the head 5.

(Ii) Playback mode When the apparatus is set to the playback mode by operating the shooting / playback mode changeover switch, the output of the changeover circuit 9 becomes high level, the switch circuit 4 becomes conductive between terminals 4c-4d, and the timer 12 turns on. Ready to operate. When the power is turned on, the servo circuit 7 is driven, and the signal 7c is at a high level before the driving state of the servo circuit 7 is stable, and is at a low level after being stable.

In this state, the timer 12 starts to operate, and if the track is not fed thereafter, the output of the OR gate 11, that is, the terminal 12b is at the low level, so the timer 12 is not reset, and the timer output becomes the low level after a predetermined time elapses. Therefore,
The control terminals 7d and 13c become low level, and power is not supplied to the servo circuit 7 and the reproduction signal processing circuit 13.

On the other hand, when a track feed is made while the timer circuit 12 is operating, the reset terminal 12b of the timer circuit 12 becomes high level and is reset via the OR gate 11. The output goes low.

Next, another embodiment of the present invention will be described. The second embodiment basically employs a configuration substantially similar to that of the first illustrated embodiment, but the timer circuit 12 is modified.

FIG. 2 shows a configuration example of the timer 112 according to another embodiment. In the figure, 100 is a known one-shot multivibrator, and 101 and 102 are a resistor (resistance value R) and a capacitor (electrostatic capacitance C ₁ ) for determining a time constant. The one-shot multi-vibrator 100 is such that when a positive pulse is input to its input terminal 100a, the output terminal 100b becomes high level for a predetermined time proportional to R · C ₁ from that point, and it is easy to use a commercially available IC. Can be realized.

In addition, a series circuit including a capacitor 103 (electrostatic capacitance C2) and a switch 104 is connected in parallel with the capacitor 102. The switch 104 can be a switch that is turned on / off depending on the type of power source, that is, depending on the mechanical connection of the applied power source, for example, off when using a small capacity battery such as a normal dry battery, It turns on when using a large capacity battery such as a car battery.

Therefore, when a battery with a large capacity is used and the switch 104 is turned on, the capacitance of the capacitor for determining the time constant is apparently (C ₁ + C ₂ ), so the switch 10
The time constant of the one-shot multivibrator is (1 + C ₂ / C ₁ ) times that of when 4 is off. Accordingly, the reproduction time in the reproduction mode can be lengthened when the capacity of the power supply is large.

FIG. 3 shows still another embodiment of the present invention. In this example, a power source which can be considered to be capable of supplying energy almost permanently as compared with a battery power source, such as an adapter from an AC power source, can be used. In the first embodiment shown in FIG. Is newly added.

The switch 14 has terminals 14a, 14b and 14c, and when using a power source having a small capacity such as a dry battery DB, terminals 14a to 14b.
When using a power supply that can be considered to have an infinite capacity, such as an AC adapter, the terminals 14a to 14c become conductive in accordance with, for example, a mechanical mounting operation. The terminal 14a of the switch 14 is connected to the terminal 7d of the servo circuit 7 and the terminal 13c of the signal processing circuit 13, the terminal 14b is connected to the terminal 12c of the timer 12, and the terminal 14c
Is connected to the high level constant voltage power supply Vcc.

The device according to the present example operates in exactly the same way as the first embodiment shown in the drawings when the battery power source is used without mounting the AC adapter, that is, when the terminals 14a to 14b are connected. On the other hand, when using the AC adapter, that is, terminal 14a
When ~ 14c is connected, since a high level signal is supplied to the terminal 14a, the power supply control of the servo circuit 7 and the signal processing circuit 13 is not performed by the timer, and even after a predetermined time has elapsed in the reproduction mode. There is no power outage, so the device continues to operate.

According to each of the embodiments described above, the power supply to the main circuit of the servo circuit or the like, which consumes a large amount of power, is stopped when a predetermined time elapses without performing the track feed operation in the reproduction mode, so that power saving is achieved. It can be performed.

It should be noted that the present invention is not limited to the embodiments shown in FIGS. 1 to 3 as long as it is an apparatus capable of shooting / playback operation with a battery power supply, and can be applied to any apparatus having any configuration. For example, changeover switch 9 and track feed switch 10
Further, any or all of the signal processing circuits 13 may be an adapter type device.

[Effects of the Invention] As described above, according to the present invention, when an image is reproduced from a recording medium by using a portable power supply, it is possible to respond to a lapse of a predetermined time from the start of reproducing an image on the same screen. At least the power supply to the drive means of the recording medium is stopped,
Power consumption related to image reproduction can be suppressed.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the image pickup device of the present invention, FIG. 2 is a circuit diagram showing the main part of another embodiment of the present invention, and FIG. 3 is a further embodiment of the present invention. It is a block diagram. 1 ... CCD, 2 ... Signal processing circuit, 3 ... Recording circuit, 4 ... Switch circuit, 5 ... Head, 6 ... Medium, 7 ... Servo circuit, 8
... Controller, 9 ... Shooting / playback mode switching circuit, 10
… Track feed switch, 12,112… Timer, 13… Playback signal processing circuit, 14… Switch.

Claims (3)

[Claims] 1. An imaging device capable of photographing and reproducing an image from a storage means using at least a portable power supply, a storage means for storing an image, a drive means for driving the storage means, and an image from the storage means. A reproducing unit for reproducing the image, a power supplying unit for selectively supplying power to the driving unit from a portable power source and an external power source, and a predetermined period after the reproducing unit continuously starts reproducing images on the same screen. A first mode in which at least power supply to the drive means is stopped in response to the lapse of time, and the power supply is supplied from the portable power source to the drive means and the control means is in an operating state. And a second mode in which electric power is supplied from the external power source to the drive unit and the control unit is in an inoperative state. 2. The image pickup apparatus according to claim 1, wherein the control means changes the time until the power supply is stopped according to the type of the portable power source. 3. An imaging device capable of imaging and reproducing from a storage means using at least a portable power supply, a storage means for storing an image, a reproduction means for reproducing the image from the storage means, and a portable power supply. And a power feeding means for selectively feeding power to the device from an external power source and the power feeding to the device in response to a lapse of a predetermined time after the reproducing device starts reproducing the image of the same screen continuously. A first mode in which the portable power supply supplies power to the drive means and the control means is in an operating state, and power is supplied from the external power supply to the drive means. And a second mode in which the control means is in an inoperative state.