JPS58158047A - Optical information reproducing head - Google Patents

Abstract

PURPOSE:To improve the driving characteristics of a head and to eliminate the variation in the stage of manufacture and the change in characteristics owing to lapse of a long time by combining metallic wires with a flexible support made of rubber which supports a lens barrel. CONSTITUTION:Metallic wires 13 are embedded in a flexible support 12 made of a U-shaped rubber which supports a lens barrel 11. Then, both advantages of the damping characteristics of rubber and the difficulty in deformation of metal can be utilized. If the metallic wires like plates are used, the wires can bend only in one direction; therefore, the metallic wires like bars having a round section are used so that the support can be bent in three directions. It is possible to adhere the wires 13 on the surface of the rubber.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical information reproducing device such as an optical disc or an optical aS
Regarding the light used in the record reproducing device, the optical mirror 1i including the optical conduit bundle means (hereinafter referred to as lens) (depending on the 4 units also includes a photodetector, beam splitter I%ζ plate, laser, etc.) ) can be made 2-dimensional to 5-dimensional, thereby making it possible to perform functions such as Fort IV, tracking, and I-Pace.

Since the III optical lens barrel is moved in two or three dimensions by electromagnetic means, in order to make it possible to do so, it is necessary to use a % optical lens barrel and g! Sekigami from 21c original to 3D #C self-
tC＠A flexible support that can be moved and supported in a downward motion is required. This support has a lens barrel at one end! Insert, Ikebata is ms1
It is supported by kuregu. Regarding the Kog-zukuri fist shape, the 1st-#c- example is shown. i.e. device α)
The flexible supports (2a) to (2d), which are curved in a U-shape and have nine folds, leak out. So-chu (5
a) ~ (3・) are coils, (4 Hatake) ~ (4C) are each of these coils All: 2 corresponding magnets, 1 coil (3d) (3
The magnet corresponding to ) is omitted on one side.

m record possible II! Support (2JL) ~ (2d) K d
1X Lower Oyo & $1 character is required 1. @11C supports the lens barrel position as an ellipse, so there is little change over time, which makes me happy 2
KII should have an appropriate resonant frequency and double characteristic.

! ! 3, it is better to move the lens barrel in parallel, but in order to move in parallel, it is necessary to support it vertically with good symmetry.

On the other hand, a lot of - comes out from the movable part including the lens barrel.

For example, if a semiconductor radar, light receiving element, etc. are integrated in the lens barrel and nine heads are used, there will be a total of 8 from these parts, plus 6 Koi A10 coils for focus, tracking, and I-im base. , a total of 14 wires need to be pulled out from the lens barrel.

The number of threads that can be pulled out from the lens barrel varies depending on the structure of the optical head. The number of wires for the drive coil is four in the case of two-axis drive for focus and tracking, but if one coil of the time base tube for correcting the position is added, the number becomes six. If only the lens is incorporated in the optical lens barrel Pg, there is only the line of carp V, but if the optical detector is incorporated tf'
When L, 5 to 5 trees are added to this, resulting in 7 to 11 trees. If V-za is added to this, there will be a maximum of 14 trees. ? :,
When these 1-ile lines are stretched straight and taken out, the mirror m is 5.
Since it is not dimensionally movable, it is necessary to use a spring-like lever to strengthen the force of the force required to take it out, and it has a big impact on the drive characteristics of the lens barrel, so it is necessary to take out the holes symmetrically from front to back and left and right. be. However, in order to take out the 14 lines as symmetrically as possible in the three-dimensional direction and as flat as possible, extra effort and a space equivalent to the space between the optical lens barrel and the external support are required. .

Flexible Y inserts are generally made of rubber-based materials. However, rubber has problems in terms of damping properties, such as changes in properties due to temperature changes, changes over time, and Ii deformation. By the way, the bell of the optical information reproducing head must always be able to swing accurately around a predetermined position, because one coil is placed in the magnetic gap circle in all directions, including the rear, left and right, and up and down directions. The range is ±4004 in front, back, left and right! , the upper F can only take about ±1.2m, and in order to be able to move within that range, Kagami Nao's positional accuracy when standing still in Heijutsu Furou is 0.1 + wP PP'3
must be in. Therefore, deformation of the rubber support is unlikely to occur.On the other hand, if the flexible support is made of metal springs, the disadvantage is that there is no damping property, but there are problems such as temperature changes, electrification over time, magical deformation, etc. There are fewer problems, and metal springs are also good electrical conductors.

The present invention has been made in consideration of the above point VctIti, and is made by combining gold mm with a flexible rubber support supporting the lens barrel f. The structure of both locations FItFi is the same as shown in Figure 1, so the following 1j! It will be omitted in the explanation of the Maro example. First, the first embodiment will be explained based on the second embodiment.A metal wire @j is embedded in a U-shaped flexible rubber support dfiP3 that holds a lens barrel. This takes advantage of both the damping properties of rubber and the resistance to deformation of metal. When a metal wire is made into a plate, it can only bend in one direction, so a rod with a round cross section is suitable for bending in five directions. The metal wire OJ in a. is placed inside the rubber flexible support (2) and molded integrally with the rubber, but it can also be attached to the surface of the rubber.

As mentioned above, a lot of hair comes out from the lens barrel, and the line processing is human hair, which also affects the characteristics of /C, so it is better to use a holding body as shown in Figure 46, that is, @ In Fig. 5, a flexible support Q4) made of rubber is attached to a central small-diameter annular part Q- that fits around the lens barrel, a large-diameter annular part that is similar to this small-diameter annular part u@, and both of these parts. The support is composed of a large number of circular arc parts ■... located at equal intervals of 11 to connect the circular parts O-〇〇, and each of these circular arc parts It supports the lens barrel, and the metal wire 1s...
By using a conductive wire, it is possible to carry out the wrapping process from the first line, and there is no need for extra wrapping, and a long optical read/write head with simple characteristics can be obtained.

As described above, according to the present invention, the uniformity of the optical information reproducing head is improved, - variations in operation and characteristic changes over time are eliminated, and the manufacturing process is made less labor intensive, resulting in lower costs. This makes it possible to

[Brief explanation of the drawing]

First! 5 is a perspective view showing the configuration of an optical information reproducing head;
FIG. 2 is a perspective view of essential parts showing a first embodiment of the pond of the present invention, and FIG. 3 is a plan view of a support in the embodiment of the pond of the present invention. (11)... Lens barrel, α2... Flexible support, as.
...Metal #1%1141...Flexible support, α-Oφ
... Enjo part, +17) ... Arc part, 1181...
Metal wire agent Yoshihiro MorikiFigure 1
2 Figure 2 2 Second

Claims (1)

[Scope of Claims] 1. A lens barrel containing a light focusing means, and a lens made of rubber that has one end fixed to the above-mentioned -m and the other end fixed to a fixed part and supports the lens barrel so as to be movable in two-dimensional or three-dimensional directions. a flexible support body, and an electromagnetic IK for moving the lens barrel in two-dimensional to six fire direction directions.
An optical information reproducing head comprising a metal wire attached to the flexible support. 2. The optical information reproducing head according to claim 1, wherein the λ metal wire is made of a good conductor, and the metal wire is used as a lead wire from the lens barrel.