JP3134943B2 - 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 a reproducing apparatus for reproducing a video signal recorded on a disk-shaped recording medium.

[0002]

2. Description of the Related Art A recording / reproducing apparatus called a still video floppy using a small magnetic disk as a recording medium of a video signal has been put into practical use as an electronic still camera. In the recording / reproducing apparatus, a video signal of one field is recorded on one of a plurality of (for example, 50) concentric tracks formed on a magnetic disk. A still image is reproduced and output by repeatedly reproducing the field video signal of the same track. Therefore, in the conventional example, during reproduction output,
The magnetic disk continues to rotate at a steady rotational speed of 3,600 rpm, and the magnetic head is always in contact with the magnetic disk.

[0003]

As described above, in the prior art, since the magnetic head is in contact with the magnetic disk during reproduction output, both parts are worn. Also, considerable power is consumed to rotate the magnetic disk at a constant speed. Electronic still cameras typically use batteries as a power source,
It is desired to reduce power consumption.

[0004] It is an object of the present invention to provide a reproducing apparatus which solves such a problem.

[0005]

A reproducing apparatus according to the present invention continuously reproduces images at predetermined time intervals set by a user.
Playback device with an interval playback function
And rotate the disk-shaped recording medium at a predetermined steady speed.
Te, a reproduction means for reproducing the video signal, again by said reproducing means
An image memory means for storing at least one frame of the signal generated, to read the stored signal to said image memory means
Output means for outputting and outputting; and
The predetermined time interval is longer than a predetermined time
The image reproduced by the reproducing means,
After being stored in the image memory means, the next image is reproduced.
In a state where the rotation of the disk-shaped recording medium is stopped
A control means for controlling output by the output means.
And a step . Playback device according to the present invention
Also, images are continuously captured at predetermined time intervals set by the user.
Playback device having an interval playback function for playing back
Thus, the disk-shaped recording medium is rotated at a predetermined steady speed.
Reproducing means for reproducing a video signal;
Image memo that stores the generated signal for at least one screen
Reading the signal stored in the image memory means.
Output means for outputting and outputting; and
The predetermined time interval is longer than a predetermined time
The image reproduced by the reproducing means,
After being stored in the image memory means, the next image is reproduced.
The rotation of the disk-shaped recording medium is controlled by the steady speed.
Output by the output means while rotating at a lower speed.
Control means for controlling to perform force.
I do.

[0006]

According to the above arrangement, the power consumption of the apparatus can be reduced.
You.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an electronic still image reproducing apparatus having a reproducing function.
FIG. 2 is a block diagram showing a configuration of an embodiment of the present invention applied to a camera. Reference numeral 10 denotes an imaging element, and 12 denotes an imaging signal processing circuit that performs camera signal processing such as gamma correction and addition of a synchronization signal to an output signal of the imaging element 10 and outputs a video signal. 14
Denotes an image memory, which comprises an A / D converter 16, a memory 18, and a D / A converter 20. 22 is a recording processing circuit;
4, a recording amplifier; 26, a magnetic head; 28, a magnetic disk; 30, a motor for rotating the magnetic disk 28; 32, a servo circuit for rotating the motor 30 at a constant speed; A head moving mechanism 36 for moving the head in the direction is a stepping motor serving as a driving source of the head moving mechanism 34.

38 is a reproduction amplifier, 40 is a reproduction processing circuit,
An output circuit 42 outputs a video signal or a reproduced video signal of a captured image to an output terminal 44 with a predetermined impedance. Reference numerals 46, 48, and 50 are switches that can be switched between recording and reproducing.

Reference numeral 52 denotes a control circuit for controlling the entire system, 54 denotes a display device for displaying an operation state and the like, and 56 denotes a switch for transmitting the operation state of an operation switch to be described later to the control circuit 52.
Interface. 58, a mode switch for instructing an operation mode (recording or reproduction); 60, an image sensor 1
0, a release switch for instructing recording of a photographed image on the magnetic disk 28, and a track-up switch 62 for instructing the magnetic head 26 to move in the inner circumferential track direction.
A switch 64 is a track down switch for instructing movement in the outer track direction, a C / S switch 66 for instructing continuous shooting or single shooting, and 68 is continuous while changing the playback track at regular intervals. Start / stop switch for interval playback to perform automatic playback, 70
Is an interval switch for designating an operation interval during interval recording or interval reproduction. In this embodiment, the interval switch 70 can select one of three types.

The switches 58, 66, and 70 are composed of lock type switch elements, and the switches 60, 62, 6
Reference numerals 4 and 68 are non-lock type switch elements.

First, the operation at the time of recording will be briefly described. When the mode switch 58 is turned on, the control circuit 52 enters the recording mode, and records a photographed image on the magnetic disk 28 in response to the operation of the release switch 60. That is, the imaging device 10 and the imaging signal processing circuit 12 are in an operating state,
The image sensor 10 converts a subject image by an imaging optical system (not shown) into an electric signal.
Known camera signal processing such as automatic gain control and gamma correction is performed on the output signal of 0, and a synchronization signal is added. The output of the imaging signal processing circuit 12 is applied to the image memory 14 via the switch 46, digitized by the A / D converter 16 and temporarily stored in the memory 18.

The control circuit 52 starts the rotation of the magnetic disk 28 by the servo circuit 32 and the motor 30 in response to the operation of the switch 60, and the servo circuit 32 maintains the magnetic disk 28 at a predetermined rotation speed. Magnetic disk 28
When the rotation speed of the memory becomes stable at 3,600 rpm, the control circuit 52 connects the switches 48 and 50 to the contact a, and the memory 1
8 is read out. The video signal read from the memory 18 is converted back to an analog signal by the D / A converter 20,
2 is applied.

The recording processing circuit 22 performs recording processing such as FM modulation on the input signal, and the output is applied to the magnetic head 26 via the recording amplifier 24 and the switch 50, and is recorded on the magnetic disk 28. The control circuit 52 switches the switch 50 to the contact b immediately after the recording on the magnetic disk 28 is completed.

After the recording on the magnetic disk 28 is completed, the control circuit 52 stops the motor 30, moves the magnetic head 26 to the adjacent unrecorded track by the stepping motor 36 and the head moving mechanism 34, and performs the next recording operation. Standby state.

The above is a single recording operation. However, when continuous photographing (so-called continuous photographing) is set by the C / S switch 66, every time set by the interval switch 70, Photographing (recording) is performed.
Interval switch 70 allows you to select from 3 frames / sec, 5 frames / sec, and 10 frames / sec.
During this continuous photographing, even if one photographing (recording on the magnetic disk 28) is completed, the interval switch 7 can be operated without stopping the motor 30, that is, the magnetic disk 28.
The photographing is repeated at a set time interval of 0.

Next, the operation in the reproduction mode will be described. FIG.
Shows a flowchart of the reproduction mode of the present embodiment. When the mode switch 58 is turned off, the control circuit 52 enters the reproduction mode, and connects the switches 46, 48 and 50 to the contacts b. The control circuit 52 also starts a timer (S1), and rotates the magnetic disk 28 at 3,600 rpm by the motor 30 and the servo circuit 32 (S2).

Waiting for the rotation to stabilize (S3), and when stabilized, the reproduction amplifier 38 and the reproduction processing circuit 40 are activated (S4). The output of the magnetic head 26 is a switch 50
The signal is applied to a reproduction processing circuit 40 via a reproduction amplifier 38, and the reproduction processing circuit 40 performs reproduction processing such as FM demodulation and outputs a reproduced video signal. The output of the reproduction processing circuit 40 is applied to the image memory 14 via the switch 46, digitized by the A / D converter 16 and written into the memory 18. When the reproduced video signal is written to the memory 18, the video signal stored in the memory 18 is repeatedly read out thereafter, converted into an analog signal by the D / A converter 20, and output through the switch 48 and the output circuit 42. The signal is output to the terminal 44 (S4).

The control circuit 52 responds to the operation of the up switch 62 and the down switch 64 (S5, 6),
The magnetic head 26 is moved to another track by the step motor 36 and the head moving mechanism 34 (S7,
8). When a predetermined time elapses without operating any of the switches 62 and 64 (S9), the control circuit 52 stops the rotation of the motor 30, that is, the magnetic disk 28 (S1).
0). While the magnetic disk 28 is stopped, the memory 1
8 is repeatedly read out and output from the output terminal 44.

When one of the switches 62, 64 is operated to move the magnetic head 26 (S7, 8), the timer is cleared (S11), and if the magnetic disk 28 is rotating at a predetermined speed (S12). The video signal immediately recorded on the destination track is reproduced and stored in the memory 18 and output from the output terminal 44 (S4). If the magnetic disk 28 is not rotating at a predetermined speed (S12), S2 is performed.
Then, the magnetic disk 28 is rotated at a predetermined speed by the motor 30 and the servo circuit 32 again.

Next, the interval reproduction mode will be described. This is a mode in which all the recording tracks of the magnetic disk 28 are reproduced in order from the outer circumference to the inner circumference at regular time intervals (interval time). The mode is started by operating the start / stop switch 68, and the start / stop switch 68 is started.
The operation is stopped by operating the switch 68. After reaching the inner circumference again, it is moved to the outer circumference and thereafter the inner circumference side is reproduced in order. The interval time can be selected from three types (for example, 2 seconds, 3 seconds, and 5 seconds) by the switch 70. When the interval time is 5 seconds, the rotation of the magnetic disk 28 is stopped after the video signal recorded on the magnetic disk 28 is fetched into the memory 18, but when the interval time is 3 seconds, the magnetic disk 28 is stopped. 28 rotation is continued. Whether the rotation of the magnetic disk 28 is continued or stopped is determined by the time from the start of rotation of the stopped magnetic disk 28 to its stabilization.

In the above embodiment, when it is not necessary to rotate the magnetic disk 28 at a predetermined speed, the magnetic disk 28 is completely stopped. However, the magnetic disk 28 may be rotated at a lower rotation speed. This also has the advantages of saving power consumption and shortening the response time required for stable rotation at the predetermined number of revolutions required for reproduction.

During the movement of the magnetic head 26 by the step motor 36, the motor 30 of the magnetic disk 28
It is better to reduce the peak power by driving the step motor 36.

As a specific method of stopping or decelerating the motor 30, there are a method of cutting off the power supply to the motor 30 and a method of reducing the voltage applied to the motor 30. Motor 30
Since the reproduction amplifier 38 and the reproduction processing circuit 40 are not required during the stop or the deceleration, the power supply to these is preferably cut off.

[0025]

As can be easily understood from the above description, according to the present invention, the power consumption can be reduced as a whole, and the battery can be driven for a longer time even when driven by a battery.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram of an embodiment of the present invention.

FIG. 2 is a flowchart in a reproduction mode.

[Explanation of symbols]

10: Image sensor 12: Image signal processing circuit 14: Image memory 16: A / D converter 18: Memory 20: D
/ A converter 22: recording processing circuit 24: recording amplifier
26: Magnetic head 28: Magnetic disk 30: Motor 32: Servo circuit 34: Head moving mechanism 36: Step motor 38: Reproduction amplifier 40: Reproduction processing circuit 42: Output circuit 44: Output terminal 46, 48, 5
0: switch 52: control circuit 54: display device 5
6: Switch interface 58: Mode switch 60: Release switch 62: Track up switch 64: Track down switch
66: C / S switch 68: Start / stop switch 70: Interval switch

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) G11B 19/00 G11B 19/02 G11B 5/027 H04N 5/781 H04N 5/85 H04N 9/79 H03H 17 / 02

Claims (2)

(57) [Claims] (1)Continuous at predetermined time intervals set by the user
Device with interval playback function for playing back images
And  Disk-shaped recording mediumIs rotated at a predetermined steady speed,Movie
Reproducing means for reproducing an image signal;Reproduced by the reproducing means Signal for at least one screen
Image memory means for storing;Read and output the signal stored in the image memory means
Output means for performing The predetermined time interval at the time of the interval reproduction is set in advance.
If the time is longer than the predetermined time,
The reproduced image is stored in the image memory means.
Thereafter, until the next image is reproduced, the disc-shaped recording medium
The output by the output means in a state where the rotation of the body is stopped
Control means for controlling to perform Characterized by
Playback device. 2. Continuously at predetermined time intervals set by a user.
Device with interval playback function for playing back images
And The disc-shaped recording medium is rotated at a predetermined steady speed to
Reproducing means for reproducing an image signal; The signal for at least one screen reproduced by the reproducing means is
Image memory means for storing; Read and output the signal stored in the image memory means
Output means for performing The predetermined time interval during the interval reproduction is set in advance.
If the time is longer than the predetermined time,
The reproduced image is stored in the image memory means.
Thereafter, until the next image is reproduced, the disc-shaped recording medium is reproduced.
A state in which the body is rotated at a lower speed than the steady speed.
Control to perform output by the output means in a state
And a playback device.