JPS6098531A - Optical information processor - Google Patents

Abstract

PURPOSE:To reduce the number of parts using a magnet and a spring in common and to reduce the size of the whole device by incorporating a semiconductor laser, an optical parts and a photodiode in one optical body and supporting the optical body by one shaft inserted into a shaft hole of an arm part and one spring. CONSTITUTION:An objective lens 26, a photodiode 37 and a semiconductor laser 38 are incorporated in one optical body 48 and an arm part 34 having a shaft hole 33 is fixed to the optical body 48. A coil 39 is fixed to the optical body 48, and when a shaft 32 is inserted into the shaft hole 33 of the arm part 34, the optical body is vibrated around the shaft 32 by magnetomotive force, moved rockingly in the direction 20 and then slided in the direction 21 along the shaft 32. Sinec the moving quantity in the directions 20, 21 becomes a distortion quantity balancing the magnetomotive force with the reaction force of a spring 35, the moving quantity of the optical body can be controlled by changing the value of current flowing into the coil 39. If the current flow is reversed, the optical body can be moved in the reverse direction.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for optically reading or writing information or writing and reading information simultaneously.

Recently, devices that optically read or write information or simultaneously perform writing and reading, such as digital audio disks, magneto-optical disks, etc., have been prototyped or put into practical use. FIG. 1 is an assembled sectional view showing an embodiment of a conventional information reading device. The light generated by the semiconductor laser 1 passes through the collimator lens 2, the prism 6, and the objective lens 4, and then is reflected on the surface of the disk 5 on which information (bits) is recorded. The light passes through the lens 6 and reaches the Honda Ode 7, where the light is converted into an electrical signal. However, the information (pits) recorded on the disk is extremely small, and due to the warp of the disk, the eccentricity of the track, etc., the Shibinoto moves in the 20 and 21 directions, and the laser beam moves in the 20 and 21 directions accordingly. There is a need. One way to do this is to move the objective lens in the 20th and 21st directions using the device shown in the iRI diagram.
and two spiral springs 12 that maintain a neutral position with a magnetic circuit composed of a magnet 12, a magnetic body 13, and a coil 11. This is the leaf spring 14 that maintains the condition. In this method, the reflected light reflected from the surface of the disk used to move the objective lens in the 20 directions shifts from the initial position of the photodiode 7 as it moves, making it impossible to read information accurately. Since two types of magnets 8 and 12 and two types of springs 12 and 14 are each required for moving the objective lens in the 21 directions, the number of parts increases. Furthermore, there were various drawbacks such as the overall size of this device.

The present invention eliminates such drawbacks, is unaffected by moving the laser beam in two directions, reduces the number of parts by sharing magnets and springs, and reduces the overall size of the device. An object of the present invention is to provide a writing device, a writing device, or a writing/reading device.

The present invention will be explained in detail below with reference to the drawings. FIG. 2 is a perspective view showing an embodiment of the present invention, and 36 is an objective lens;
37 is a photodiode, 38 is a semiconductor laser, which are incorporated into the optical body 48, 34 is an arm portion having a shaft hole 33 and fixed to the optical body 48, 40.41 is a magnetic body, and 42.4 is a magnetic body.
3 is a magnet, 39 is fixed to the optical body 48 with a coil,
65 is fixed to the optical body 48 and the fixing base 31 with a spring.

The feature of the present invention is that the semiconductor laser, optical components, and photodiode are compressed into one optical body, and this is supported by one shaft and one spring inserted into the shaft hole of the arm. It is in the point where it is.

The coil 69 shown in Fig. 2 consists of a coil wound in the same direction on the circumference as shown in Fig. 41(a), and a coil wound in a square as shown in Fig. 5(a). However, when this coil 69 is inserted into the gap 49.50 of the four-beam circuit shown in FIG. 3, a magnetomotive force 51 in 21 directions is generated as shown in FIG. As shown in Ql(1)), magnetomotive force 52 in 20 directions is generated. The coil 39 is fixed to the optical body 48, and when the shaft 32 is inserted into the shaft hole 33 of the arm, the optical body swings around the shaft 32 due to the above-mentioned magnetomotive force and moves in the 20 directions. Furthermore, axis 3
2 in the 21 direction. Since the amount of movement in the directions 20 and 21 is the amount of deflection that is the sum of the magnetomotive force and the reaction force of the spring 55, the amount of movement of the optical body can be controlled by changing the value of the current flowing through the coil, and the amount of movement of the optical body can be controlled by changing the value of the current flowing through the coil. can be moved in the opposite direction by flowing in the opposite direction.

By integrally driving the optical body in this way, the reflected light from the disk always reaches a fixed location on the light-receiving section, allowing accurate information to be read.Furthermore, the magnets required to move the optical body in two directions can be shared, and there is only one spring, reducing the number of useless parts, and at the same time making the entire device smaller.

In this embodiment, an objective lens, a photodiode, and a semiconductor laser are listed as elements incorporated into the optical body, but other optical components such as a collimating lens, a prism, a diffraction grating, a polarizing plate, a concave lens, a convex lens, and a cylindrical lens may also be used.
It can be used not only as an optical information reading device but also as an optical information writing device or writing/reading device.

Further, the material of the spring may be rubber, metal, plastic, etc. Although the coil is shown as a single layer in FIGS. 4 and 5, the same effect can be obtained with two or more layers, and the coil may not be fixed to the photoreceptor but may be fixed to the arm. The direction of the magnetic poles of the magnet is not limited to the direction shown in Fig. 3, but may be reversed as shown in Fig. 6(a), or may be in the direction shown in Fig. 6(b). The direction of the magnetic flux passing through the gap may be opposite. In addition, the magnetic circuit is
Figure (a).

As shown in (b), if there are two on each side and two coils, the magnetomotive force can be increased. Further, although the magnetic circuit and coil are placed above the arm in FIG. 2, the same effect can be obtained even if the magnetic circuit and coil are placed below the arm. Further, in FIG. 2, each part is fixed with screws, but other methods such as adhesive, press-fitting, welding, etc. may be used.

As described above, according to the present invention, the light emitting elements, optical components, photodiodes, etc. necessary for an optical information reading device or writing or writing/reading device are incorporated into one optical body, and the above elements are integrated to drive it. Accurate information can be read and written without positional or angular deviation between the two directions, and magnets can be shared for driving in two orthogonal directions, and neutral in two directions. If the spring that maintains the position is also shared, the number of parts can be reduced, and an inexpensive device can be provided that is easy to assemble.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of an embodiment of a conventional optical information reading device, FIG. 2 is a perspective view of an embodiment of the present invention, and FIG. 3 is a diagram for explaining a magnetic circuit. Figure 4 (a), (b
) and Figures 5(a) and 5(b) are diagrams explaining the coil winding method and magnetomotive force, Figure 6(a), (1)) and Figure 7(a).
). (b) is a diagram explaining another magnetic circuit. 1.38...Semiconductor laser, 32...Axis, 54...
・Arm part, 35... Spring, 4.36... Objective lens,
7.37...Photodiode, 11.14.39 ・
... Coil, 9.10, 13, 40, 41 ... Magnetic body, 8.15.42°43 ... Magnet, 48 ... Optical body, 49.50 ... Gap, 51.5. 2...Magnetomotive force. Applicant: Seiko Electronic Industries Co., Ltd. Agent Patent Attorney Mogami Figure 1 Figure 2

Claims (1)

[Claims] Light-emitting elements, optical components necessary to optically read or write information, or write and read information at the same time.
An optical body incorporating an element such as a photodiode, an arm fixed to the optical body and having a hole into which one shaft can be inserted, and a coil fixed to the optical body and generating force in two orthogonal directions. , an optical information processing device comprising a magnetic circuit having a gap into which the coil is inserted, and a spring that keeps the optical body in a neutral position;
An optical information processing device characterized in that the optical body is moved in two orthogonal directions by simultaneously sliding it in the axial direction.