JPH03134870A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To eliminate useless power consumption by stopping a current supply to a fixing means for an optical head when the optical head is not moved for a given period of time. CONSTITUTION:A speed command for the optical head 1 is outputted by a microcomputer 5, and this speed command is compared with the present speed detected by a speed detector 4. This error amt, is calculated, and the speed of the optical head 1 is controlled to follow the speed command. And, the optical head 1 can be fixed by a plunger 9 for a head brake. A 1st speed command detecting part 10 is a detecting circuit for detecting the speed command to be outputted from the microcomputer 5, and when no speed command is outputted for a prescribed time, the current supply to the plunger 9 for fixing the optical head 1 is stopped. On the other hand, under the fixing state of this optical head, the speed command for a speed control part is detected, and when the speed command is outputted, a current is supplied to the fixing means to cancel the fixing operation of the optical head. By this method, the current supply to the fixing means can be suppressed to a requisite min.. and hence useless power consumption can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an information recording and reproducing apparatus that records and reproduces information on and from an information recording medium such as an optical disk using an optical head.

[Conventional technology]

FIG. 3 shows a block diagram of a general optical head speed control device.

The optical head 1 is mainly composed of optical components such as a semiconductor laser and a condenser lens, and is configured to be movable in any direction. For example, when a disc-shaped optical disc is used as a recording medium, the optical head 1 is configured to be movable in the radial direction of the optical disc.

The optical head 1 is driven by the voice coil motor 2.
The position of the optical head 1 is detected by detecting the amount of displacement of the voice coil motor 2 with a linear encoder 3. Further, the output of the linear encoder 3 is input to a speed detector 4, and the current speed of the optical head 1 is detected based on this signal. (2) The microcomputer 5 outputs a speed command for the optical head 1, and the speed commands outputted during acceleration and deceleration of the optical head 1 are input to the subtracter 6. On the other hand, the current speed of the optical head 1 detected by the speed detector 4 is also
The error is extracted by subtracting the speed of both swords. Based on this error signal, the compensation controller 7 controls the driver 8 so that the speed of the optical head 1 follows the command, thereby controlling the rotational speed of the disc coil motor 2. That is, the speed of the optical head 1 is controlled to the command speed by the driver 8 varying the drive current of the voice coil motor 2 under the control of the compensation controller 7.

Incidentally, such optical heads are susceptible to vibrations and shocks, so they are generally fixed so that they do not move when the apparatus is not in use. When the device is used, it is controlled so that it is ready for operation, for example, in accordance with the procedure shown in the fourth example.

First, when the device is powered on (81), an optical disk is loaded (S2), and a detection section within the device detects whether or not the optical disk has been properly loaded.

Generally, up to this point, a brake is applied to the optical head, assuming that the device is not in a stationary state but in a moving state, for example, during transportation. Vibration when moving parts or equipment.

Since the optical head can crash due to impact, a brake is applied to the optical head to keep it in place. For example, a pusher is used as the head brake, and in order to completely release the brake, current is passed through the plunger to release the brake punt that is preloaded and pressed against the optical head (S3). Therefore, while the optical head seeks to access the original disk, at least one current is applied to the plunger to release the hend brake.
It is necessary to supply approximately 0 to 50 mA.

After releasing the head brake, the disc coil motor for driving the optical head is driven to move the optical head to the reference position (S4), and then the spindle motor is driven to rotate the optical disk (S5).

Next, what about the actuator to drive the objective lens? The mechanism is turned on (S6), the optical head performs a seek operation to the target track, and a normal operation of recording or reproducing information is performed (S7).

[Problem to be solved by the invention]

However, in such conventional devices, current must be supplied to the plunger even when the optical head is not moving. For example, even when access is being made between tracks within the movable range of the objective lens actuator, current must be applied to the plunger of the head brake. As a result, the silanger generates heat, causing a rise in temperature within the device, which may adversely affect other parts. Furthermore, the supply of current to the plunger was wasteful, which was not preferable from the point of view of energy conservation.

The present invention was developed in light of these circumstances, and its purpose is to eliminate unnecessary power consumption.
The purpose of the present invention is to provide a recording/playback device.

[Failure to solve the problem]

In order to achieve all of the above objectives, in an information recording/reproducing apparatus having an optical head that seeks (5) on a recording medium and a fixing means for fixing this optical head, a speed command output from a speed control section of the optical head is set to a predetermined value. a first detecting means for detecting at every time M interval and outputting a signal if a speed command is not output even once within the predetermined time; a second detection means for detecting a speed command from a speed control section; an output of the first detection means stops supplying current to the fixing means; and an output of the second detection means supplies current to the fixing means; There is provided an information recording/reproducing apparatus characterized in that: (1) a driving means for releasing the fixing operation of the optical head;

[Effect]

In the present invention, the speed command output from the speed control section of optical head) 9 is detected at a constant time interval of '191, and this 1y
If the speed command is not output even once within the fixed time T, it is determined that there is no seek of the optical head, and the current supply to the optical head fixing means is stopped.

As a result, the optical head is fixed (6), but there is no problem as there is no seek operation. On the other hand, when the optical head is in the fixed state, a speed command from the speed control section is similarly detected, and when the speed command is output, current is supplied to the fixing means to release the fixing operation of the optical head. Therefore, the entire current supply to the fixing means can be suppressed to the necessary minimum, making it possible to eliminate wasteful power consumption.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the first page. 1mth block is a block diagram showing an embodiment of the information distribution reproducing apparatus of the present invention.

In the first example, the same parts as in the conventional device are given the same reference numerals, and detailed explanation thereof will be omitted.

In the first case, the microcomputer 5.

As mentioned above, the entire speed command of the optical head 1 is outputted, and the speed command output here is compared with the current speed detected by the speed detector 4. Then, the error is calculated, and the speed of the optical head 1 is controlled based on the obtained error so as to follow the speed command. Further, the optical head 1 has a structure that can be fixed by a plunger 9 of a head brake.

The first speed command detection section 10 is a detection circuit that detects a speed command output from the microcomputer 5, and outputs a signal if a speed command is not output within a predetermined time. That is, the first speed command detection section 10 includes an internal timer, and detects a speed command at every predetermined time interval measured by the timer. Since the speed command is always output from the microcomputer 5 when the optical head 1 performs a seek operation, the movement of the optical head 1 can be detected by detecting the speed command. Therefore, if the speed command is not output even once within a predetermined time, it can be determined that the optical head 1 is not seeking, and the current supply to the 1 runger 9 for fixing the optical head 1 is stopped as described later. , to save electricity3.
In this embodiment, the speed command is detected at every 60 second time interval.

If the speed command is not output at least once within 60 seconds,
A non-detection signal of the speed command is output to the silanger drive unit 12.

The second speed detection section 11 similarly includes a microcomputer 5.
This circuit detects a speed command output from the plunger drive unit 12, and outputs a speed command detection signal to the plunger drive unit 12. For example, when a personal computer is instructed to access a large amount of data, the microcomputer 5
A speed command is output from the optical head 1 in order to seek the optical head 1 to a target track. Upon receiving the speed command detection signal, the plunger drive unit 12 supplies current to the silanger 9 to release the brake of the optical head 1 in order to make the optical head 1 movable.

Next, the operation of the embodiment will be explained with reference to the flowchart shown in FIG. In addition, in Figure 2,
81 to S7 show the flow from turning on the power of the device to normal operation, which is completely the same as the conventional one.

Therefore, in S7, the brake of the optical head 1 is released, and the normal operation of distributing the optical disc or reproducing (9) is being performed. In this normal operation, the first speed command detection section 10 detects the speed command output from the microcomputer 5 (S8). If no speed command is output within 60 seconds, the first speed command detection section 10 outputs a non-detection signal to the plunger drive section 12. As a result, the plunger drive unit 12 stops supplying current to the granger 9 and applies a brake to the optical head 1 (S9). In this case, the optical head 1 will be in a fixed state and will not be able to seek, but as mentioned above, if the speed command is not output even once every 60 seconds, it can be determined that there is no seek operation of the optical head 1. , there is no practical problem at all. The first speed command detection section 10 detects such a speed command every 60 seconds, and outputs the detection result to the plunger drive section 12 each time.

Next, when a speed command is output from the microcomputer 5 with the brake applied to the optical head 1, the speed command is detected by the second speed command detection section (10) 11 (810). For example, when a user issues a full data access command using a personal computer, the microcomputer 5 outputs a speed command,
This is detected by the second speed command detection section 11. The same applies when the host converter side determines that seeking of the optical head 1 is necessary. The detection signal from the second speed command detection section 11 is output to the plunger drive section 12, and the plunger drive section 12 supplies all electricity to the granger 9 (811). As a result, the braking action of the plunger 9 is released again, and the optical head 1 becomes ready for seek operation and performs normal operation.

In addition, in the above embodiment, the first speed command detection section 10 is
Although we have shown an example of detecting speed commands at every 0 second time interval,
There is no need to limit the time to 60 seconds; for example, it may be set within a range of about 10 seconds to 10 minutes depending on the user's needs. - [Effects of the Invention] As explained above, according to the present invention, when the optical head does not move for a certain period of time, the current supply to the optical head fixing means is stopped, thereby eliminating unnecessary power consumption. Not only can this be done, but it also has the effect of preventing an excessive rise in temperature within the device.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the information recording/reproducing device of the present invention, FIG. 2 is a flowchart showing the operation of the embodiment, FIG. 3 is a block diagram of a conventional device, and FIG. 4 is a block diagram of the conventional device. 2 is a flowchart showing the operation from power-on to normal operation. ■...Optical head, 4...Speed detector, 5...Microcomputer, 9...Plunger 1o...
・First speed command detection section, 11... Second speed command detection section, 12... Plunger drive section

Claims (1)

[Scope of Claims] An information recording/reproducing apparatus having an optical head that seeks on a recording medium and a fixing means for fixing the optical head, wherein a speed command output from a speed control section of the optical head is controlled at predetermined time intervals. a first detection means for detecting and outputting a signal if a speed command is not output even once within the predetermined time period; a second detection means for detecting a command; an output of the first detection means stops the current supply to the fixing means; an output of the second detection means supplies current to the fixation means to control the optical head; 1. An information recording/reproducing device comprising: a drive means for releasing a fixed operation.