JPS61150169A - Optical recording and reproducing device - Google Patents

Abstract

PURPOSE:To make a highly accurate and high speed access possible by applying an electromagnetic force to a square shape coil fixed to a slide block holding an optical head through a pre-load spring. CONSTITUTION:To a slide block guided to an inside yoke 15 by a triangle column shaped bearing 9, a square shape coil 11 is fixed. By a current flowing to the coil 11 and a magnet disposed at an outside yoke 13, an electromagnetic force is generated in the coil 11. By the electromagnetic force, an optical head 1 held to the block 8 through a preload spring 12 moves radially of an optical 1 together with a block 8. By a construction in which a driving bar and the like is not required, a position relation of the respective parts is highly accurate and light, the vicinity of a center of gravity of the optical head is moved and a highly accurate and high speed access by the optical head is carried out.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an optical recording/reproducing device for recording or reproducing optical information on a disk.Prior art The present invention is called the information age. The technology development of high-density, large-capacity memory, which forms the core of this technology, is actively underway. In addition to the above-mentioned high density and large capacity, the capabilities required of memory include high reliability and high speed access, and optical disk memory is attracting the most attention as a device that satisfies all of these requirements. Optical disk memory is a device that optically records information on a recording medium.Recently, a lot of research has been conducted on magneto-optical media that can also repeatedly erase and record recorded information and their recording and reproducing devices. .

An example of the above-mentioned conventional optical recording/reproducing device will be described below with reference to the drawings.

FIG. 3 shows a block diagram of a conventional optical recording/reproducing device. 1 is an optical disc which is an optical information recording medium;
Reference numeral 2 denotes a motor that rotates the optical disc 1. 3 is an optical head that forms a light spot on the original disk 1; 4 is a carriage to which the optical head 3 is attached; and 6 is a drive bar provided on the carriage 4. 6 is a drive guide when the carriage 4 is driven; 7 is a drive guide when the carriage 4 is driven;
This is a driving means for driving the.

The operation of the optical recording/reproducing apparatus configured as described above will be explained below.

First, the original disk 1 is given a predetermined rotation by the motor 2 . The optical head 3 attached to the carriage 4 is supported and driven by a drive guide 6 via a drive bar 5 by a drive means 7 such as a voice coil type linear motor.

The optical head 3 records or reproduces optical information on the optical disc 1 while being driven by the driving means 7. (For example, Japanese Unexamined Patent Publication No. 159-524'3) Problems to be Solved by the Invention However, the above configuration increases the size of the device, and since a carriage, drive guide, etc. are used, the installation may be loose. increases, making it difficult to improve accuracy.

In particular, since these carriers, tsujis, drive guides, etc. are used,
It increased the moving mass and was not suitable for the high speed access desired in current devices.

The present invention has been made in view of the above-mentioned prior art, and it is an object of the present invention to provide an optical recording/reproducing device that is currently available in the market and is highly accurate, allows high-speed access, and can be made more compact.

Means for Solving the Problems In order to solve the above problems, the optical recording/reproducing device of the present invention comprises an optical head for recording or reproducing information on an optical disk, and a triangular prism having an isosceles triangular cross section. A slide block is provided with a rolling member on each of two rectangular surfaces with the same area (hereinafter referred to as Mu surface and B surface), and a rectangular surface excluding the entrance surface and B surface of the slide block (hereinafter referred to as C surface). The inner plane of a cylindrical coil having a flat surface is fixed to the 0 plane of the slide block so that the axial direction of the cylindrical coil and the intersecting line of the Mu plane and B plane of the slide block are parallel. is parallel to the radial direction of the optical disc, and is attached to both sides of the optical head facing each other, at least one through a preload spring, so that the intersection line of the entrance surface of the slide block and surface B is parallel to the radial direction of the optical disc. □ Two plate-shaped magnets each fixed to two outer yokes placed outside each coil, and two plate magnets placed inside each coil and attached to the A of the slide block.
It has a V-shaped cross section consisting of two surfaces that are approximately parallel to the two surfaces, surface and B, and contacts the rolling member to enable the slide block and optical head to move in the disk radial direction, and is the same as the outer yoke. The inner yokes are connected at both ends of each outer yoke, and the positional relationship between the inner yokes is adjusted so that there is a gap between the two outer yokes and the coil. It is composed of a holding member for regulating.

Effect of the present invention With the above configuration, by selecting the direction of the current applied to the two cylindrical coils and the direction of magnetization of the permanent magnet fixed to the outer yoke, the interaction between the two causes the cylindrical coil to The direction of the generated electromagnetic force can be parallel to the disk radial direction.

A slide block fixed to each cylindrical coil is attached so as to sandwich the optical head under a preload applied in a direction perpendicular to the direction of electromagnetic force. The multiple rolling members installed on the slide block rotate in contact with the inner yoke, achieving smooth movement, and the generated electromagnetic force drives the optical head in a direction parallel to the radial direction of the disk without rattling with the inner yoke. be done. Further, since the movable mass other than the optical head can be reduced, high-speed access is possible, and furthermore, the entire device can be made smaller.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an optical recording/reproducing apparatus in one embodiment of the present invention, and FIG. 2 is a sectional view thereof. In FIGS. 1 and 2, 1 is an optical disk which is an optical information recording medium, 3 is an optical head, and 08, which is the same as the conventional example, is two triangular prism-shaped slide blocks. Reference numeral 9 denotes bearings, which are rotatably attached to two sides of the system slide block 8 by pins 1o, one on the top and two on the bottom. 11 is a rectangular coil, which is fixed to one surface of the slide block 8. 12 is a preload spring. One of the two slide blocks 8 is attached via a preload spring 12, and the other is attached directly to the optical head 3 in parallel. 13 each has a magnet 1
4 are fixed, and are provided parallel to the side surface of the optical head 3. Two inner yokes 16 have two surfaces substantially parallel to the two surfaces of the slide block 8, and are provided so as to rotate in contact with three bearings. The outer yoke 13 and the inner yoke 16 are kept parallel and fixed at both ends. 16 is an inner yoke 16 for regulating the positional relationship between the inner yokes 13;
It is a holding member fixed at both ends of.

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

First, the two magnets 14'ii are magnetized in the direction of the arrow B, and when a current is passed through the two square coils 11 in the direction of the arrow B, due to the interaction between the two, the square coil 11 is magnetized at right angles to the arrow B. arrow C
An electromagnetic field is generated in the direction of . The optical head 3, which is attached so as to be sandwiched between slide blocks 8 fixed to each square coil 11, is given a preload in the direction of the arrow by a preload spring 12. It can slide on the inner peripheral surface of the inner yoke 16 via the bearing 9, and is driven by the electromagnetic force generated in the coil 11.

As described above, according to this embodiment, one of the two slide blocks 8 is attached via the preload spring 12 and the other is attached so as to directly sandwich the optical head 3.
Since the bearing 9 provided on the slide block 8 rotates in contact with the inner circumferential surface of the inner yoke 16 which also serves as a guide, the movable mass can be reduced, and looseness due to dimensional errors that occur during installation can be suppressed. . Also,
Square coil 11, inner yoke 15 and outer yoke 13
Since the drive unit composed of It can be realized.

Effects of the Invention As described above, the present invention is a carriage integrated type in which the optical head also serves as a carriage, and a spring is used for the carriage to always give a constant preload, and the preload can be applied easily and accurately. It has a sliding mechanism using the inner surface of the yoke as a guide. The driving method is to use two voice coil type linear motors with a large driving force, with the optical head sandwiched between them.

With these features, it is possible to suppress the looseness that sometimes occurs during installation, and it is also possible to significantly reduce the movable mass.Furthermore, since it is equivalent to driving a position close to the center of gravity of the optical head, High-speed access with higher accuracy can be achieved.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an optical recording and reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a sectional view thereof, and FIG. 3 is a block diagram of a conventional optical recording and reproducing apparatus. 1...Optical disk, 3...Optical head, 8...Slide block, 9...Mark, bearing, 10...Mark, bottle, 11...Square Koinope
12. River: Preload spring, 13. River: Outer yoke, 14... Magnet, 16... Inner yoke. Name of agent: Patent attorney Toshio Nakao (1st person)
figure! ---Moto Tensuge 3-11 Optical Hesode δ---Slide Flock n-11 Square Coil 161--Time Keeping Member Fig. 2/-11 Optical Teeth 7 3-m-Optical Head 8-m -Slide 7' Lock 15-11 Inner flight L-G^C Fig. 3

Claims (1)

[Claims] An optical head for recording or reproducing information on an optical disk, and a triangular prism having an isosceles triangular cross section, and a rolling member is provided on each of two rectangular first and second surfaces having the same area among the surfaces constituting the triangular prism. A set of slide blocks provided, and a rectangular third surface other than the first and second surfaces of the slide blocks, are arranged such that the axial direction of the cylindrical coil intersects the first and second surfaces of the slide blocks. The inner plane of the cylindrical coil is fixed so that the inner plane is parallel to the line, and the inner plane of the cylindrical coil is parallel to the radial direction of the optical disk, and on both parallel sides of the optical head facing each other, at least one side is provided with a preload spring, The outer plane of the cylindrical coil is fixed so that the intersection line of the first surface and the second surface of the slide block is parallel to the radial direction of the optical disk, and the two coils are disposed outside of each of the coils. two outer yokes, two plate-shaped magnets each fixed to the outer yokes, and two plate magnets arranged inside the two coils and approximately parallel to the first and second surfaces of the slide block. It has a V-shaped cross section consisting of a surface, contacts the rolling member and enables the slide block and the optical head to move in the disk radial direction, has the same length as the outer yoke, and has the same length as the outer yoke. two inner yokes connected at both ends of each of the outer yokes so as to have a gap between the outer yokes and the coil; and a holding that regulates the positional relationship between the two inner yokes at both ends of the inner yokes. An optical recording/reproducing device comprising: