JPS6215863Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support device for an optical system element in a disc player such as an optical video disc player or an audio disc player.

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 light diffracted from the laser beam emitted by the laser tube 1 by the grating 2, 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 exchanged into a circularly polarized light beam by a quarter-wave plate 7, and further used to track a 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 pit 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.

The optical system elements mentioned above are regularly arranged on the optical system thread to constitute the optical system.
Some of the parts in the optical system element cannot be arranged accurately with mechanical precision alone, and require severe adjustment. When performing this adjustment, the adjustment direction is mostly in the X direction and the Y direction within a plane perpendicular to the optical axis Z, as shown in FIG.

Conventionally, the above-mentioned adjustment in the X and Y directions requires complicated adjustment operations, which makes the work difficult. For example, special jigs and tools such as an eccentric screwdriver are used to perform adjustment operations, and the work direction is difficult, such as engaging the screwdriver from the side or from below. I had to do some hard work.

The present invention has been proposed in view of the above-mentioned conventional circumstances, and is intended to facilitate the accurate adjustment of optical elements as described above.

Furthermore, another object of the present invention is to provide an adjustment mechanism that realizes the above-mentioned adjustment mechanism with a simple structure, is easy to manufacture and assemble, and is excellent in terms of economy.

That is, the present invention is a support structure for an optical system element used in the optical system of an optical disc player, which restricts the movement of the optical system element in the optical axis direction and allows movement only in a direction perpendicular to the optical axis direction. a holder body that holds the element so that
A supporting means made of an elastic material is arranged such that the base end is fixedly supported on the holder body and the distal end is adjustable in the height direction at two points, and a parts holder fixing means is attached to the distal end of the supporting means. It is characterized by having.

Hereinafter, embodiments of the present invention shown in the drawings will be described.

First, FIGS. 3 to 7 show essential parts of an example of the device of the present invention.

Reference numeral 1 denotes a holder body, which is integrally disposed on an optical system thread (not shown). This holder body 1
Vertical portions 2, 3 and 4, 5 are formed upright above near both sides of one end 1a and the other end 1b. The height h of each of the pair of vertical parts 2 and 3 on the one end 1a side is equal to the height h of each of the pair of vertical parts 4 and 3 on the other end 1b side.
The bottom is formed lower than the height H of 5. It should be noted that sufficient gaps 6, 7 for beam passage are maintained between the vertical portions 2, 3 and 4, 5 of each pair.

Further, reference numeral 8 denotes a leaf spring piece constituting the support means, and in the illustrated example, it is formed by punching into a flat plate shape having an H-shape in plan view. Both end portions 81a and 81b on the base end 81 side of the leaf spring piece 8 are fixed with fixing screws on the respective top portions 4a and 5a of the tall vertical portions 4 and 5 provided on the other end 1b side of the holder main body 1. It is fixedly supported by 9A and 9B.

Further, through holes 83a and 83b for inserting adjustment screws 10 and 11 are formed in both end portions 82a and 82b on the tip 82 side of the leaf spring piece 8, and the portion 82
a and 82b face above the tops 2a and 3a of the respective vertical portions 2 and 3 on the one end 1a side of the holder main body 1. In addition, each of these vertical parts 2 and 3 has a female threaded hole 2 into which the adjustment screws 10 and 11 are screwed.
1 and 31 are threaded in the vertical direction, and the top portions 2a,
It is opened at 3a. The adjustment screws 10 and 11 are
The height can be freely adjusted by rotating the heads 10a, 11a and screwing them forward and backward, respectively, and below the heads 10a, 11a are both end portions 82a on the tip side of the leaf spring piece 8, 82b is engaged.

Reference numeral 13 denotes a parts holder, which has a hole 131 for attaching an optical element such as a lens formed through the central part, and a connecting screw hole 13 on the upper end surface 13a.
The lower end 13 of the support rod 133 is screwed into the hole 132 by a fixing screw (not shown).
It is supported by 3a. In addition, the support rod 133
The upper end 133b is fixed near the center of the tip 82 of the leaf spring piece 8 by a mounting screw 134. Further, on both left and right side surfaces of the parts holder 13, grooves 135 that are continuous in the vertical direction,
136 are carved, and the bottom portions 135a, 136a of these grooves 135, 136 are bent into an arc shape. When the parts holder 13 is assembled to the main body holder 1, the grooves 135, 136 are arranged so that the vertical parts 2, 3 are
By being inserted into and engaged with the parts holder 36, the movement of the parts holder 13 in the axial direction is restricted.

That is, the parts holder 13 is inserted into the groove 13.
5,136 inner surfaces 135b, 135c and 13
6b, 136c and each front and rear surface 2b of the vertical parts 2, 3,
The axial position is set by abutting engagement between 2c and 3b, 3c.

In the above configuration, the setting position of the element mounted in the optical element mounting hole 131 of the parts holder 13 can be easily adjusted by rotating the adjustment screw 10 or 11. For example, when one adjustment screw 10 is rotated as shown in FIG. 8A, the parts holder 13 is adjusted to move in the direction of arrow X, and the other adjustment screw 11 is rotated as shown in FIG. 8B. As a result, the parts holder 13 is adjusted to move in the direction of the arrow Y. Therefore, simply by rotating these two adjustment screws 10 or 11 from above, the tip 82 side portion of the leaf spring piece 8 can be easily elastically deformed, and the parts holder 13 can be adjusted.

Note that the shape of the leaf spring piece 8 is not limited to the above shape.
Various other modifications are possible as long as the shape allows the position of the parts holder 13 to be adjusted by deforming the tip side using the two adjustment screws 10 and 11.

For example, the leaf spring piece 80 shown in FIG. 5, and the tip is 80c.
By fixing the parts holder 13 near the center of the board and forming the through holes 83a and 83b for inserting the adjusting screws near the L-shaped bent parts 80d and 80c on both sides of the tip 80c side, the plate on the above side can be fixed. Similar to the spring piece 8, the position of the parts holder 13 can be easily adjusted using the two adjusting screws 10 and 11.

As mentioned above, in the present invention, the proximal end of one leaf spring piece is fixed to the main body holder, and the tip is pressed against the holder side with a drop using two adjustment screws. The optical parts holder is held down precisely perpendicular to the optical axis by the leaf spring.

The adjustment method is also extremely simple; by rotating one of the two adjustment screws, the optical parts holder will be rotated using the other adjustment screw as a fulcrum; If they are rotated in the same direction at the same time, the optical panel holder will be adjusted to move up and down.

Therefore, the optical parts holder can be easily adjusted in the X and Y directions from directly above using the two adjustment screws.

Furthermore, since the present invention uses only one leaf spring piece, the configuration is extremely simplified and the intended purpose can be easily achieved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an overview of the optical system of an optical disc player. FIG. 2 is a diagram illustrating the adjustment direction of optical parts. Figure 3 and subsequent figures show embodiments of the present invention, with Figure 3 being a schematic external perspective view, Figure 4 being a plan view, Figure 5 being a front view, Figure 6 being a side view, and Figure 7 being a side view.
The figure is an enlarged perspective view of the parts holder, and FIG. 8 is a schematic front view for explaining the adjustment direction, and A and B show different adjustment states. FIG. 9 is a perspective view showing another example of the leaf spring piece. 1... Holder body, 2, 3, 4, 5... Vertical portion, 8, 80... Leaf spring piece, 10, 11... Adjustment screw, 13... Parts holder.

Claims (1)

[Scope of utility model registration request] A support structure for an optical system element used in an optical system of an optical disc player, which restricts movement of the optical system element in the optical axis direction and allows movement only in a direction perpendicular to the optical axis direction. a holder body that holds the element; a support means made of an elastic material whose base end is fixedly supported on the holder body and whose distal end is adjustable in the height direction at two points; An optical parts support device characterized by having a parts holder fixing means at the tip.