JPS6043231A - Optical pickup device - Google Patents

Abstract

PURPOSE:To reduce the overall height of an optical pickup device by at least as much as the thickness of a base by arranging a magnetic circuit which moves a lens support cylinder axially on the surface of the base opposite to the lens supporting cylinder support surface. CONSTITUTION:The 1st bobbin 31 wound with the 1st coil 30 is fixed coaxially under the lens support cylinder, and a part of the 1st bobbin 31 projects downward into a part of the base 20 from an opened hole 32. The 1st yoke 33, the 1st magnet 34, and the 2nd yoke 35 are stacked in one body and fixed onto the reverse surface of the base 20 along the hole 32. The 2nd magnetic circuit part 24 consists of the 2nd annular magnet 37 fixed to the internal surface circumferential part of the 3rd yoke 36, the 4th annular yoke 38 fixed onto the internal surface of the 2nd magnet 37, and the 2nd coil 40 wound around the 2nd bobbin 39 fixed to the external surface of the free end of a leaf spring 25. Thus, the 1st magnetic circuit part 23 is arranged on the reverse surface of the base 20 to shorten the overall height H' by at least the thickness (20mm.) of the base 20.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application This -A side relates to an optical pink amplifier device, and particularly to an optical big amplifier device with a miniaturized trJJ head.

The prior art optical pink-up device is a device for detecting information from the reflected laser beam focused on the information trunk of the information storage medium in the form of a Rede metal disk, as shown in Figure 'i1 and Figure 2. The figure shows a seven-wheeler 1j. As shown in the figure, in (1), a hole (la) through which the Rede element permeates is formed at the bottom C of a non-muscular body such as aluminum. (2) v yo base +1
) One end of the lens is supported by the third/medical firefly (3) that is missing on the top, (4) 7i base d tl) is fixed on the top,
R! L no 7 Orcus Kakeru 1 first victory, immediate use part/magnetic notebook part,
(5) is the second magnetic circuit section for 0 person/10 system, with the trunking fixed on the second section (6) and the second section protruding from the sub section (1) Qi). 0 Lens Town/Komata Gyoto (2) is on lll1l'1II110 of No./projection wall (3) (on Jl, one end is attached and extends for μ4-10,000 times parallel to base +1+) A parallel spring +71171, drawing board spring +7
+ 171 play ``Ill ijl 1) 1,000 times perpendicular to the base + 1)'' J Novi 1.1 Mourning 18),
Inside the cylinder (8): +1 autopsy revised, upper F of the cylinder (8)
The supporting piece t' in the axial direction 0J' is supported by the circular spiral support spring (10) (10) with a constant circumferential hoe part at Miij.
Lfc lens structure - Consists of I cylinders (9), and inside the lens support cylinder (9), objective lenses 1+t) are coaxially fixed and six objective lenses (lυ is a support spring t10111LII)
K in the optical axis direction, and plate springs 171+71 in the tracking direction perpendicular to the optical axis. ψ
The wire is the first bobbin that is coaxially fixed to the F end of the lens support tube (9), the first coil is wound around the first bobbin μ, and the second coil is the second coil of one of the springs (7). A second bobbin, l, defined perpendicularly to the outer surface of the end facing the waste wax (6);
15) is the second coil wound on the second bobbin I, and 6th/magnetic turn, and 6th (4) is a pair of fJ/yokes that are magnetically biased and have a U-shaped folded surface with the first coil haze. The leg piece of the yoke (6a,) is made of solid wood, and the paper piece (1
6 is fixed on the base [1]. 9? )J'llv'
;i:6'4/ a-ri i [11tiLil) Outer leg piece (16a) (on the inner surface of the 16-ri is a pair of magnets with a constant length A, each of which has a seventh yoke, +t9, +i1t4A
A magnetic circuit is formed in which an orthogonal magnetic field is applied to the first coil 4 by biasing the magnetic field. When MRA is applied to the first coil haze, the first /
The external force is distributed to the first bobbin 9 through the 7th coil O barrel by the magnetic field distributed in the air circuit section (4),
The objective lens (focus is controlled in one direction).

In the first twelfth cycle, each part (6) includes a second yoke 118 fixed to the inner surface of the second coil and the first projecting wall (6) and placed within the second bobbin threshold by 1Φ, and a second yoke. A second yoke defined on the inner surface of the state, a second biasing +al*a′A
Acupuncture stones 1194 are used to apply four orthogonal magnetic fields to the first coil haze. When the second coil U5) is passed through, an external force of 11 is applied in the axial direction to the second bobbin U through the second coil and the second magnetic circuit part +61, and the objective When the lens itg is perpendicular to the optical axis, the tracking sub-
be done.

By the way, there is a strong demand for small-sized optical pickup devices, and the 64 parts are as small as the town Lj.
In particular, there were 14 tassels in the height structure. That is, group 8(1)
Upper VC No./Magnetic Meito (4) and lens movable support part (2)
Since it is installed immediately +1ffi L/, the total height Hrir4 (required height of both J and base tl) thickness d
0 and /IIa air circuit part (4), which is determined by the phase of B, which is longer than the upper fdJ stroke length necessary for the lens 7 orcus sub-L and autopsy, and there is a limit to reduction. It is a shame to use an inexpensive ferrite magnet for the 71st stone VIη, but the magnetic flux density is not f, and in order to obtain a preferable control property, the 71st stone VIη is changed to the upper F. coil(
I had to increase the number of windings (il-1-X).Therefore, I did not make the 7th magnetic rotation part (4) short am, but increased the overall height H.
The inconvenience of getting even bigger is rare.

The original example I configuration zero departure] aims to solve the above problems and realize a compact optical pink-up device. 1. A flat base to hold the laser beam, and a whole holding lens for the entire laser beam.
r+1 sleeve 1a and supported in the axial direction and in the 9-section direction perpendicular to the axis, the yoke with the coil and magnetic bias, and the bent lens support tube in the 9-section direction perpendicular to the axis. 2 magnetic circuits to be transferred respectively, and of the magnetic circuits, the magnetic circuits to be transferred to the lens support tubes K and P are placed on the surface opposite to the support surface in the lens support direction of the base. Try to hold on.

This allows the overall thickness to be reduced by the thickness of the base. In addition, since the fJ/magnetic A circuit αμ is located on the base aOF plane, it cannot be expanded laterally without causing any harm. I can do that.

Home Example Below, the husband example of the wood example will be explained from Figure 453 and the second example. At a loss in the diagram, (7) is the handle d, and the connecting part (hole) C that communicates with the front and back of the mid-height [X19] is budding! The circle is the base & 01J) Mataton that sank from one end, the prisoner is the protruding wall 1tυ
Forked (+) Lens town J support part, 1be is base 12Q
The 1st magnetic circuit part, 7th gradient is the 2w1 magnetic circuit part placed on the base steel part.

Lens 0IdJ support city is a beam wall! ! A pair of temporary springs 4 extending parallel to the base steel with a small gap from 1), a cylindrical body frame fixed between the free ends of the temporary springs (3) and 4, and +rtI inside the cylindrical body end. The upper and lower ends of the lens support cylinder are supported by a pair of support springs w'6 t2TI extending from the upper and lower ends of the cylinder body 4, and the objective lens (
C) are fixed coaxially. The first bobbin υ around which the seventh coil is wound is fixed coaxially to the tip of the end of the lens support tube, and a part of the first bobbin holder is connected to a hole opened in a part of the base plate (2). It stands out from F to 10,000. F of the above hole C4
Around the face side, a pair of folded 4/yoter gates, a flat rectangular (/l) -q first sekiseki 1.141 figure, and a pair of second yoke (to) oka are placed a. And with the inside of the coil! /magnetic circuit section-. 1st York Makoto,
The second yawter c4 is stacked and integrated into the base 1AJ) with a hole in the F side) so that the second yawter c4 is kept constant.

Then, one side wall of the No./bobbin μυ is inserted between the leg piece φ4 protruding above the inner end of the first yoke and the fJ/m stone threshold and the inner end surface of the second yoke link to form a filter. The magnetic field is directly divided into two parts.

In addition, on the third yoke installed vertically above the base plate, there is a ring-shaped second magnet (3'7) on the third yoke, the periphery of the 3QD inner surface, and a second magnet. (The second magnetic circuit part Z candle is made up of the ring bending coil which is fixed at 3ηD inward bending, the temporary spring (fl which is fixed at the outer surface of the free end of 4, and the second coil frame which is wrapped around the 2nd bobbin stiffness) I am a member of the staff.

In this manner, the first air conduction circuit section (by arranging the prayer on the base gul 96, the overall height H is at least about 215+, which is the thickness of the base 4) is shortened. Also, the base 1. !
The yoke and magnet of the first magnetic circuit section (c) can be placed on the space τt7 in the decreasing direction, so that the yoke and magnet 1.1 of the first yoke 31-1 and magnet 1.1 can be rewritten on the F side of the
41 example and fJ2 Yota style (even if it is thin at 8 yen, the magnetic flux density of P min' is superior by using the dog-like t of Senryu Menko, and the 1st round of the 4-city train is also thinner with the mill) It becomes the town H2, and the whole is 7).

To more than the effect of the invention, it is possible to make the Moku'A man's small and lightweight design. In the evening, the Samurai magnet can be miniaturized by using a 7-magnet light-based magnet τ, since sufficient magnetic flux density can be obtained by increasing the vJj surface.
You can also aim for 1 cost Dakun.

[Brief explanation of the drawing]

Figures 7 and 2 are an example of a conventional optical pickup display, showing a part of the NT plane and a diagram of the NT song in the 8-person housing, and Figures 3 and 7 are an example of a wooden Part d showing one medical practice example
The r-plane view and B-B, the mrt river view used in 17i, the base, μ... the lens movable support part, (c)...!
, g/Lake circuit part, (2 tatami/fist 2nd magnetic circuit part, 4...
Objective lens, - Communication port (Fig. 1, Fig. 2, Fig. 3, shadow, 2)

Claims (1)

[Claims] (1) Front and back communication parts (connected to the flat base that supports the objective lens that focuses the radar light and the base) are arranged coaxially with the platform part, and the part that intersects with the sleeve in the axial direction and la This refers to two sets of magnetic circuits, each consisting of a lens support tube that is supported with a variable dJ in the direction, and a yoke that is magnetically biased with a coil and that hides the lens support tube/tube. Now, the magnetic circuit 4, which moves the inside of the magnetic circuit to the entire sleeve of the sleeve with the Shinsel design, is placed on the opposite side of the lens on the base and the cylinder with the design. Big amplifier equipment-〇