JPS59162669A - Optical recording and reproducing device - Google Patents

Abstract

PURPOSE:To hold high track follow-up capacity by controlling always the attitude of an optical pickup in the tangent direction of a track to make the tangent direction and the direction of the division line of a 2-divided photodetector coincident with each other when the optical pickup is transferred on the optical disc. CONSTITUTION:The optical pickup 35 is mounted to the other end of an arm- shaped transferring member 32 so that the optical pickup 35 can be turned around the optical axis by a revolving shaft 34, and the optical pickup 35 is fixed in one end part of a connecting member 36. A guide groove 36a is provided in the other end part of the connecting member 36 in the lengthwise direction, and the center shaft 31a of an optical disc 40 is engaged with the guide groove 36a. Consequently, when the transferring member 32 is shaked and driven between the position indicated by a solid line and the position indicated by a broken line, the connecting member 36 is turned around the center shaft 31a while sliding on the center shaft 31a in the part of a guide groove 36a, and therefore, the angular position relation of the optical pickup 35 to the tracks is not changed. That is, the attitude of the optical pickup 35 is controlled in the direction of an tangent (a) for a minimum diameter of the tracks and is attitude controlled in the direction of a tangent (b) for a maximum diameter of the tracks.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an optical recording/reproducing device for writing information on an optical disc or reading information stored on an optical disc.

(Prior art) As shown in FIG. 1, a collimator lens 2 converts a single nose light beam emitted from a nose light source 1 into a parallel beam, a beam sinter 3 bends the optical path, 1/4 lambda wave plate 4 has a width of 1, and the objective 1/lens 5 has a width of 1
The light is focused and irradiated onto the recording section 6a of the optical disk 6 as Y2, and the reflected light? The above objective lens 5, 174 wavelength plate 4. An optical recording and reproducing device is already known in which the beam splitter 3 and the lens 7 are used for detection by a two-part beam splitter and one moxibustion device 8. The optical system parts except for the optical disk 6 are integrally constructed as an optical bink assog 9.

In such a device, when reproducing a signal recorded in the trunk of the optical disk 6 by intermittent signal pits, the reproducing laser beam is irradiated onto the optical disk 60m1, and the reflected light is used as the effect 58. receives the light and reproduces the signal. Also, when recording signals on the optical disc 6, use the Bu1 group? The recording surface 6a of the optical disk 6 is irradiated with a recording laser beam to record a signal in the form of signal bits 1If11f.

(Even if it is i+几, it is necessary to make sure that the laser beam is accurately irradiated onto a predetermined track of the optical disk 6.

Therefore, the intensity distribution of the reflected light is detected by the two-split photodetector 8, and the output difference between the signals of each split detector is determined, thereby detecting the track area of the focused laser beam on the optical disk surface. , the focused laser beam returns to the center of the track, and the objective 1/lens 5 or the optical pickup 9 is moved to perform track following on the open side j.

Therefore, the dividing line 8A of the two-dividing source detector 8 should always be parallel to the tangent to the track of the optical disk 6. This method detects the track end signal by the change in the light pattern projected onto the two-split photodetector 8, so it can be detected in two directions: the track contact direction and the detector dividing line direction. By the occurrence of deviations.

As shown in FIG. 2, the detection sensitivity of trunk displacement changes greatly, and the trunk displacement signal? It cannot always be obtained stably, and the trunk follow-up control characteristics deteriorate.

In addition, in Fig. 2, line A indicates the case where the lights are tangential to the trunk and the dividing line directions do not match, and line B indicates the case where the dividing line direction is the same as the track tangential direction. be.

Also, write information 'f! :1 Even when monitoring with another reading light beam immediately after, write-! Since the position of the reading light beam with respect to the precise information trunk changes depending on the transfer point, causing the track to fail, it may not be possible to perform normal monitoring over the entire range of the information track on the optical disk surface. Ta.

In FIG. 3, the optical big amplifier is moved in the radial direction of the optical disk. 11+L swing arm type recording/playback device
Above the optical disc J2 which is rotationally driven around a shaft 11 by an optical disc drive motor (not shown), a swinging arm 13 is parallel to the optical disc 12 around a shaft 14. A light pickup 15 is mounted on a shaft so as to be swingable in a plane, and a light pickup 15 that emits a light beam 21 is mounted on one end of the arm 13 as shown in FIG.
is fixed.

Swing arm J3 II! A moving coil 16 is fixedly attached to the two ends, and this moving coil 16 is connected to the magnetic path member 17.1.
It is driven by a 61J near motor 20 made of 8, permanent low stone 19, etc., and as a result, the swinging arm 13 swings, causing the optical pickup 15 to be pushed to the minimum of the track of the optical disc 12. From diameter to maximum diameter, the trunk exists within a distance that allows the disc to be transported radially.

In this conventional swing arm type recording/reproducing device, the track tangential direction, the photodetector dividing line direction, and the force (force) constantly change depending on the transport position of the optical pickup, and as a result, as mentioned earlier, , the output of the two-split photodetector for the trunk f'L fluctuates, which adversely affects the follow-up control of the optical pickup directed to the truck.

System 5 diagram shows an example of a linear transfer type recording/reproducing device, in which the optical bisquanograph 23 is driven by the linear motor 24 so that the transfer stroke t Vf# is sent in the linear direction. It has become.

This method is used to reduce the size of the device itself.

Due to this configuration, the optical pickup is not directed to the rotation center of the optical disk 12.

Similar to the swing arm type, the tangential direction of the trunk and the dividing line direction of the photodetector constantly change depending on the position of the optical pickup 23, which has an adverse effect on the tracking control described above.

(Purpose of the invention) The present invention has been made in view of the above points.1. It's something that was.

Not limited to swing arm type or linear transfer type recording and reproducing devices, the relative position between the tangential direction of the track and the dividing line direction of the two-split photodetector changes, so that they always match at least once. Now, the optical pickup can be transferred.

The object of the present invention is to provide an optical recording/reproducing device.

(Structure of the Invention) The present invention will be described below with reference to FIGS. 6 to 8. explain.

FIG. 6 shows a swing arm type optical recording/reproducing apparatus according to one embodiment of the present invention, in which an optical disk 30 is rotationally driven by a disk rotation motor 31 as shown in FIG.

Arm-shaped transfer member 321'! ,, a pivot supported horizontally with respect to a pivot 33, one end of this transfer member 32 (
The transfer member 32 is driven by a linear motor (not shown) which is a transfer drive source, and is caused to swing between the solid line position and the imaginary line position.

An optical pickup 35 is mounted on the 11i2 end of the transfer member 32 so as to be rotatable around the optical axis by means of a rotating shaft 34. On the other hand, an optical pickup 35 is fixedly installed at one end of the connecting member 36, and with this configuration, the one end is rotated toward the optical axis side of the optical pink amplifier with respect to the transfer member 32.
possible to be pivoted.

A guide groove 36 is provided at the other end of the connecting member 36 in the longitudinal direction.
A is provided, and the central shaft 31a of the optical disc 30 is engaged with this guide groove 36a.

That is, the connecting member 36 is arranged such that a shaft member such as a shaft 31a, which is coaxial with the center of rotation of the optical disc 30, is engaged with the guide 36a.

According to this optical pickup transfer device, the transfer member 32 is oscillated between the solid line position and the imaginary line position by a linear motor (not shown).

The connecting member 36 slides against the center axis 31a at the guide groove 36a while the center '+'ll 31
Therefore, the connecting member 3
The angular positional relationship of the optical pickup 35 fixedly attached to the optical pickup 6 with respect to the track does not change.

That is, as shown in FIG. 6, in the track existing range], the optical pickup 35
This results in the person's posture falling to the side. Incidentally, the optical pickup 35 is directed in the tangential direction a at the minimum diameter of the track, and in the tangential direction at the maximum diameter of the track.

Therefore, the tangential direction of the track and the two
The recording and reproducing device is adjusted so that the directions of the dividing lines of the divided photodetectors coincide.

It is important to always maintain the matching state during the transfer of the optical big amplifier.

FIG. 8 shows an example of a linear transfer type optical recording/reproducing apparatus in which the optical pickup is not directed toward the center of the optical disk. Achieving the function, optical pickup 42
is transferred in a linear direction.

That is, the optical pickup 42 is connected to a movable coil 41 so as to be able to rotate toward the optical axis, and is linearly driven in a direction across the track by a linear motor 40.

Note that the reference numeral 45 in FIG. 1 is a magnetic path member of the 11 linear motor.

The connecting member 43 has the optical pickup 42 fixedly installed at one end and has a guide groove 43a at the other end. . In this case, the attitude of the optical pickup 42 is always controlled in the tangential direction of the truck with respect to the truck existing range.Incidentally, at the minimum diameter of the trunk, the attitude of the optical pickup 42 is always controlled in the tangential direction of the truck, and at the maximum diameter of the truck. In the diameter direction, the light beam is tangential.

Pick-up 42 is straight posture 11jll l111+
Let's go.

(Effects of the Invention) As described above, the present invention has the advantage that during the transport of the optical pickup, the attitude of the optical pickup is always controlled in the tangential direction of the track.
(・So, it becomes possible to match the tangential direction with the dividing line direction of the two-split photodetector, and this coincidence reduces the detection sensitivity of the trackless σ. ), high track following performance can be maintained. Furthermore, monitoring of recorded information can be performed consistently and stably. and,
Such functionality can also be achieved with both swing arm type and linear transfer type recording and reproducing devices.

[Brief explanation of drawings]

Fig. 1 is an optical layout diagram showing an example of the configuration of an optical system of an optical recording/reproducing apparatus, and Fig. 2 is an optical layout diagram showing an example of the configuration of an optical system of an optical recording/reproducing apparatus.
Two directions: the dividing line direction of the divided photodetector and the tangential direction of the track.
Figure 3 is a plan view of a conventional optical recording/reproducing device, and Figure 4 is an optical recording/reproducing device of the same type. 5 is a plan view schematically showing a conventional linear transfer type optical recording/reproducing apparatus; FIG. 6 is a plan view of the optical recording/reproducing apparatus according to the first embodiment of the present invention; FIG. Figure 7 is a front view of the same optical recording and reproducing device, and Figure 8 is the embodiment of the present invention 1.
FIG. 1 is a plan view of an optical recording/reproducing device according to an embodiment. 30... Optical disk, 31a, 44... Center shaft serving as a shaft member, 32... Transfer member. 35.42... Optical pickup, 36.43.
...Connecting member, 36a, 43a...Guide groove, 4
1...Movable coil a' ÷ Z mouth) as a transfer member) Muj -j de pole γ IK. p pieces (transfer)

Claims (1)

[Claims] A former pick-up transfer device that lights a track on an optical disk and transfers an optical pink-up for writing information or removing a sheet to a desired 1q within a range where the track exists in a plane parallel to the optical disk surface. includes a transfer member for transporting and driving the optical amplifier, an optical pickup fixed at one end, and rotatably supported fL, 11f about the optical axis of the optical amplifier with respect to the transfer member.
The J-shaped part has a guide groove provided in the longitudinal direction, and
A shaft member having the same diameter as the center of rotation of the optical fiber and a connecting member disposed so as to engage with the guide groove of the shaft member. Characteristic optical recording and reproducing device.