JPS6233516Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a moving coil type focus linear motor.

Various disk player systems have been proposed as a means of providing video or audio information, but optical disk player systems are especially easy to reproduce disks at low cost, and have a non-contact readout between the disk and the head. It has excellent performance and functionality, such as no wear on the disc or head, high-quality recording and playback of video and audio, and especially in the case of video disc players, many functions such as slow motion and random access. has received particular attention.

And in optical disc players,
Reading of recorded signals on a disk is performed, for example, by an optical system as shown in FIG. That is, by using the first-order diffracted light produced by the grating 2 from the laser beam emitted by the laser tube 1, three beams are generated by combining the laser beam with the main beam. Then, the beam is passed through a Wollaston prism 6 by a spot lens 3, fixed reflectors 4 and 5, and then converted into a circularly polarized light beam by a quarter-wave plate 7, which is then used to track the track on the disk. The beam is guided to the objective lens 10 by a tracking mirror 8 that swings the beam in the radial direction and a tangential mirror 9 that swings the beam in the tangential direction to remove temporal fluctuations in the reproduced signal.
It is focused on one signal recording surface. Then, the reflected beam, which is modulated by the bits of the disk 11 and totally reflected by the reflective film and whose rotational direction of circularly polarized light is reversed, follows the optical path in the opposite direction, passes through the quarter-wave plate 7 again, and is combined with the incident beam. The light is converted into linearly polarized light in the right angle direction, passes through the Wollaston prism 6, reaches the photodiode 13 via the cylinder lens 12, and is detected.

By the way, a moving coil type focus linear motor is used to cause the objective lens 10 to axially oscillate and follow the axial oscillation of the disk 11.

The purpose of this invention is to make it possible to easily attach and remove the movable parts of such a focus moving type linear motor, improve work efficiency, and easily convert the movable parts. That is.

That is, in the present invention, a set screw that connects and fixes the lead terminal of the coil movable part and the external connection terminal plate of the holder is made to protrude from the holder and is screwed into a screw hole provided in the bearing part, and the set screw The present invention is characterized in that the lead terminal, the external connection terminal plate, and the bearing portion are fastened together.

An embodiment of the present invention shown in the drawings will be described below.

The illustrated embodiment shows an example in which the present invention is applied to an objective lens drive section of an optical video disc player, and FIG. 2 is an exploded perspective view, and FIG. 3 is a partially assembled view. FIG.

21 is a coil movable part, and the coil holder 2
1A has an axial through hole 22 in the center thereof, and an objective lens 23 is mounted in the hole 22. Further, a flange portion 24 is integrally formed on the holder 21A, and a shaft cylindrical portion 25 is provided protruding from the lower end side. A coil 26 wound into a cylindrical shape is integrally disposed below the flange portion 24, and each terminal wire 26 of the coil 26
A and 26B are inserted into eyelets 27A and 27B attached to the flange portion 24 and fixed by soldering.

In addition, the eyelets 27A, 27 of the flange portion 24
A small hole 2 is slightly spaced apart in the circumferential direction from the installation position of B.
8A, 28B are formed through the small holes 28A, 2.
8B, one end portion 29A of the lead wire 29 is inserted from the upper surface 24A side of the flange portion 24, and this one end portion 29A of the lead wire is inserted into the eyelets 27A, 27B from the flange lower surface 24B side, and each of the terminal wires 26A , 26B are fixed by soldering.

That is, each of the terminal wires 26A and 26B is connected and fixed to one end portion 29A of the lead wire 29 at eyelets 27A and 27B of the flange portion 24 by soldering. Note that the other end 29 of the lead wire 29
A terminal 30 having an annular portion 30A at one end is fixedly disposed on B.

Further, a notch 24C for restricting rotation is formed in a part of the outer peripheral edge of the flange portion 24.

Next, 31 is a holder, which has a protrusion 33 on the inner peripheral part of the holder main body 32 formed in an annular shape for engaging and placing the flange 24, and also relatively engaging with the notch 24C. , has an engaging column portion 34 that restricts the movement of the coil holder 21A in the circumferential direction and allows it to move only in the axial direction, and furthermore, a terminal plate 35 for external connection is provided on the upper surface 32A of the holder main body portion 32. and one end 35 of the terminal plate 35
A set screw insertion hole 36 is formed through the terminal plate and the holder main body 32, and
Further, at the other end 35B of the terminal plate 35, a connecting portion 37 to an external power source is formed. A notch 39A is formed in the outer circumferential rising wall 39 of the holder main body portion 32 near where the terminal plate 35 is disposed, and serves as an external connection wire outlet. Also, the central hole 39 of this holder 31
The coil 26 is inserted therein.

Reference numeral 40 denotes a bearing portion, which together with the holder 32 constitutes a fixed portion. This bearing section 40 has a magnet 43 integrally sandwiched between annular yokes 41 and 42, and has a through shaft hole 44 in the center into which the shaft cylinder section 25 is inserted.
There is an annular hole 4 around which the coil 26 can be inserted.
5 is formed.

Further, the upper yoke 41 has a fixing screw hole 4.
6 is threaded.

A fixing screw 47 connects the terminal 30 and the terminal plate 35, and also connects and fixes the holder 31 and the bearing part 40.

Therefore, the coil movable part 21 is attached to the holder 31.
The coil 26 is fitted from above to the holder 31.
The shaft tube part 25 is inserted into the through hole 44 of the bearing part 40, and the coil 2
6 is inserted into the annular hole 46. Further, each terminal 30 of the lead wire 29 is overlapped with the terminal plate 35 of the holder 31, so that the annular portion 30A and the set screw insertion hole 36, as well as the fixing screw hole 46 of the bearing portion 40, are aligned. Then, the fixing screw 47 is inserted into each hole 36, 46 from the annular portion 30A side and screwed and fixed.

Then, the terminal 30 and the terminal plate 35 are connected and fixed, the holder 31 and the bearing part 40 are fixed integrally, and only the coil movable part 21 is movable only in the axial direction, that is, in the vertical direction in the figure. The length of the lead wire 29 is such that the movement of the coil movable portion 21 can be sufficiently ensured. Therefore, the objective lens 23 can be easily moved in the axial direction in response to an external voltage.

As described above, in the present invention, the holder and the bearing section are connected and fixed at the same time by the screws that fix the terminals of the coil movable section. Therefore, the coil movable part, the holder, and the bearing part can be easily attached and detached using only screws, and these parts can be easily replaced.

In particular, as explained in the above embodiment, the objective lens of an optical video disc player is exposed to the outside and is prone to dust and scratches, and even in such cases, it is possible to easily replace only the moving coil portion. In addition, partial replacement of only the holder and bearing can be easily performed, improving serviceability.

[Brief explanation of the drawing]

Fig. 1 is a schematic perspective view showing the optical system of an optical video disc, Fig. 2 is an exploded perspective view of the focus moving linear motor of the present invention, and Fig. 3 is a partially assembled perspective view. . 21...Coil movable part, 21A...Coil holder, 24...Flange part, 25...Shaft cylinder part, 2
6... Coil, 29... Lead wire, 30... Terminal, 30A... Annular part, 31... Holder, 35
... Terminal board, 36 ... Screw insertion hole, 40 ... Bearing section, 41, 42 ... Yoke, 43 ... Magnet, 44 ... Shaft cylinder insertion hole, 45 ... Coil insertion hole, 46 ... Screw hole .

Claims (1)

[Scope of utility model registration request] A set screw that connects and fixes the lead terminal of the coil movable part and the terminal board for external connection of the holder protrudes from the holder and is screwed into the screw hole provided in the bearing part, and the set screw connects the lead terminal and the external connection terminal board of the holder. A moving coil type focus linear motor characterized in that a connecting terminal plate and the above-mentioned bearing part are fastened together.