JPS61142538A - Optical information recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent a laser and recording signals from deterioration at an access time and a pause time by reducing the output of the laser at the time of access or pause less than that at a reproducing time. CONSTITUTION:The gain of a laser driving circuit 5 is switched by a gain changeover switch 9 to be driven in accordance with a gain switching signal inputted from a gain changeover terminal 10. At the time of recording, reproducing or erasing, the output of the laser 6 is selected by a changeover switch 4. At the time of access or pause, a reproducing reference voltage generator 1 is selected by the switch 4 and a gain changeover switch 9 is closed by a gain switching signal inputted from the terminal 10, so that the output of the laser 6 can be reduced within a range where focusing and tracking servos will be stably driven.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an optical information recording and reproducing apparatus for data files, still image files, etc.

2. Description of the Related Art In recent years, rewritable optical information recording and reproducing devices have been actively developed as large-capacity, high-density memories. Recording, reproducing, and erasing of a conventional optical information recording/reproducing device will be explained below with reference to the drawings.

An example of a method for controlling the amount of light in other operating states will be explained by taking as an example the amount of light control in the case of a magneto-optical disk.

Figures 3 and 4 show the configuration, recording, and reproduction of a laser output control device of a conventional optical recording/reproducing device.

This shows the laser output during erasing and other operations, ie, during access, pause, etc. In Figure 3,
11 is a reference voltage generator for reproduction, 12 is a reference voltage generator for recording, and 13 is a reference voltage generator for erasing, which are used to set the laser output during each operation. 14
1 is a changeover switch for changing the reference voltage, 15 is a laser drive circuit, and 16 is a laser. The light emitted from the laser 16 is focused into a minute spot by an objective lens 17 and irradiated onto a recording medium 18 .

FIG. 4 shows the laser output in the optical recording/reproducing apparatus constructed as described above. The laser output is controlled by the laser drive circuit 16 using the reference voltage selected by the changeover switch 14, and the laser output at that time is different during erasing, recording, reproducing, and other times, as shown in FIG. It is set to 3 different levels when operating.

The laser output during other operations was at the same level as the laser output during playback.

Problems to be Solved by the Invention However, in the conventional configuration described above, the laser output during playback is preferably set to a high level for the purpose of increasing the S/N ratio, but the For many years, there has been a problem in that if laser output is continuously applied to the medium during reproduction, the recorded signal deteriorates.

In view of the above-mentioned problems, the present invention provides an optical recording/reproducing device that prevents laser deterioration and signal deterioration that occur due to laser beam injection into the medium during access, pause, etc. It is.

Means to solve problems In order to solve the above problems, the present invention aims at recording.

This device has a configuration in which the output of the laser is made lower than in the case of the three states when operating in a state other than the three states of reproduction and erasing.

Operation The present invention, with the above-described configuration, can suppress the temperature rise of the recording medium due to the medium injection of the laser during operation other than the above-mentioned three states, prevent deterioration of the signal component, and prevent deterioration of the laser.0 Implementation EXAMPLE Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an optical information recording/reproducing apparatus according to an embodiment of the present invention. In FIG. 1, 1 is a reference voltage generator for reproduction, 2 is a reference voltage generator for recording, and 3 is a reference voltage generator for erasing.The respective voltages are switched by a changeover switch 4 and are applied to a laser drive circuit 5. is input. A laser drive circuit 5 controls the output light of the laser 6. The output light of the laser 6 is narrowed down to a minute spot by an objective lens 8, and irradiated onto a recording medium 7 to perform recording, reproduction, erasing, and other operations. The gain of the laser drive circuit 5 is determined by the gain switching terminal 10.
The gain changeover switch 9 operates in response to a gain changeover signal input from the gain changeover signal.

Regarding the optical recording and reproducing device configured as above,
The operation will be explained below using FIGS. 1 and 2.

First, the output of the laser 6 during recording, reproduction, and erasing is selected by the changeover switch 4.

At the time of access, which is an operation other than the above three states.

During the pause, the output of the laser 6 is changed by selecting the reproduction reference voltage generator 1 with the changeover switch 4 and closing the gain changeover switch 9 in response to the gain changeover signal input from the gain changeover terminal 10. Lower the focus and tracking servo to a stable range. An example of the output of the laser 6 is shown in FIG. By making the laser output during other operations smaller than the laser output during playback, it is possible to prevent laser deterioration, and also to suppress the temperature rise of the medium and prevent the recorded signal from deteriorating. I can do it.

Effects of the Invention As described above, the present invention reduces the laser output during access and pause, and the laser output during playback, thereby reducing the deterioration of the laser and the recording signal during access and pause. can be prevented.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a laser output control section of an optical recording/reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is a diagram showing during erasing, recording, reproducing, and other operations in this embodiment. Figure 3 shows the configuration of the laser output control section of a conventional optical recording/reproducing device, and Figure 4 shows the conventional example during erasing. FIG. 4 is a diagram showing laser output characteristics during recording, reproduction, and other operations. 1... Reference voltage generator during reproduction, 2...
Recording reference voltage generator, 3... Erasing reference voltage generator, 4... Changeover switch, 5...
Laser drive circuit, 6... Laser, 7.
...Recording medium, 8...Objective objects, 9.
...Gain changeover switch, 10...Gain changeover terminal. Name of agent: Patent attorney Toshio Nakao and 1 other person 4-
11 paddy stalk suia+ 5-1shiiyu+7-[4 B---r, 1 year old woisu゛Figure 2

Claims (1)

[Claims] The amount of light incident on a recording medium during operations other than the recording, reproducing, and erasing states of an optical information recording/reproducing device that records information on a recording medium using optical means or reproduces information that has already been recorded. An optical information recording/reproducing apparatus characterized by comprising means for making the amount of light incident on the medium smaller than the amount of light incident on the medium in each of the recording, reproducing, and erasing states.