JPH0229524Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an optical information reading device used in a digital audio disc playback device or a video disc playback device, and more specifically, an optical information reading device that allows adjustment of the optical axis direction of a pickup. Regarding.

In a digital audio disc reproduction device or a video disc reproduction device, an optical information reading device is used to read information from an information recording disc. Reading of information by an optical information reading device is performed by sequentially picking up information recorded on an information recording disk using reflected light of light projected onto an information recording surface, which is provided in the optical information reading device.
This is done by driving the information recording disk in the radial direction. In this case, unless the optical axis of the pickup is held exactly perpendicular to the surface of the information recording disk, the information recorded on the information recording disk cannot be accurately read.

However, it has been difficult to improve the processing accuracy of the optical information reading device and keep the optical axis of the pickup perpendicular to the surface of the information recording disk. Further, when a two-tiered adjustment mechanism or the like is provided for adjusting the optical axis of the pickup, there are drawbacks such as the structure becomes complicated and large.

The present invention has been developed in consideration of the above problems and drawbacks, and allows the optical axis of the pickup to be adjusted independently in the radial direction of the information recording disk and in the tangential direction to the circumference of the disk, and can be constructed in a compact size. The object is to provide an optical information reading device.

The present invention will be explained below with reference to examples.

FIG. 1a is a perspective view of an embodiment of the present invention,
FIG. 1b is a perspective view showing a main part of an embodiment of the present invention, and FIG. 1c is a sectional view of FIG. 1b. Also, Figures 2a, b and c are front views of the main parts of Figure 1,
They are a top view and a side view.

Information recording disk (hereinafter simply referred to as disk) 1 on which information is digitally encoded and recorded
is detachably fixed to a turntable 2 which is rotationally driven by a motor 3, and is rotated by the motor 3 via the turntable 2. On the other hand, the optical information reading device of this embodiment has a pick-up holding mechanism that holds a pick-up 4 that houses an optical system for reading information and a conversion system that converts optical conversion information read by the optical system into an electrical signal. 5
and a pick-up moving mechanism 6 for moving the pick-up holding mechanism 5 in the radial direction of the disk 1.

The pick-up holding mechanism 5 consists of a pick-up mounting bracket 7 to which the pick-up 4 is fixed, and a pick-up base 8.

A pick-up 4 is fixed to the pick-up mounting bracket 7 with a fixing screw 9. The pick-up base 8 supports the pick-up mounting bracket 7 via a pick-up rotation hinge 10 so as to be rotatable in the radial direction of the disk 1 (hereinafter simply referred to as the radial direction). Note that 11 is a light input hole of the pickup 1, and 12 is an escape hole for the fixing screw 9.

The pick-up moving mechanism 6 is provided on the optical unit base 13, and the two slide shafts 1
4 and 15, the pick-up holding mechanism 5 is made movable in the radial direction. Slide shaft 1
A limit switch 16 for end detection is installed at the end of 4.
is attached, and when the light input hole 11 reaches the outer periphery of the disk 1, the drive of the pickup holding mechanism 5 is stopped. Also, the slide shaft 14,
A pull screw 17 and a push screw 18 for adjusting the height of the slide shafts 14 and 15 are provided at the ends of the slide shafts 15 . The side plate 19 of the optical unit base 13 has a pinion 21 that meshes with a rack 20 fixed to the side surface of the pick-up holding mechanism 5, and a pinion 21 that is directly connected to the pinion 21 and has a pick-up holding mechanism 5.
A motor 22 is mounted to drive the disc 1 in the radial direction. Furthermore, the side plate 19 includes a pinion 23 and a pinion 23 that mesh with the rack 20.
A radial position detector, such as a variable resistor 24, is mounted, which is directly connected to the radial position sensor. Note that 25 is a slide button provided on the pick-up base 8.

On the other hand, an optical axis radial adjustment section 26 is attached to the pickup holding mechanism 5, and an optical axis tangential direction adjustment section 27 is attached between the pickup holding mechanism 5 and the pickup moving mechanism 6. The optical axis radial direction adjusting section 26 is a means for adjusting the optical axis in the radial direction provided between the pick-up mounting bracket 7 and the pick-up base 8, and is provided on both sides of the pick-up mounting bracket 7 and the pick-up base 8, respectively. Separately fixed studs 28-1 and 28-2, a spring 29 stretched between the studs 28-1 and 28-2, and a pick-up base 8
The adjustment screw 30 is screwed through the pick-up base 8 and has its tip abutted against the pick-up mounting bracket 7. Therefore, the pick-up mounting bracket 7 is rotated and tilted clockwise in FIG. The pick-up fitting 7 can be rotated counterclockwise in FIG. Therefore, by adjusting the adjustment screw 30, the optical axis of the pickup 4 can be adjusted in the radial direction.

The optical axis tangential direction adjusting section 27 is provided between the pick-up base 8 and the slide shaft 15, and is an adjusting means for adjusting the optical axis of the pick-up 4 in the tangential direction of the outer circumference of the disk (hereinafter simply referred to as the tangential direction). It consists of a shaft stopper 31 fixed to the lower surface of the pick-up base 8, and a shaft guide 32 slidably fitted into the shaft stopper 31 and abutted on the bottom surface of the pick-up base 8 on the front side. In addition, the shaft guide 3
2 is formed into an inclined surface, and the lower surface 33 of the shaft guide tool 32 and the shaft slip-off prevention tool 31
A slide shaft 15 is positioned between the shaft guides 32 and the shaft 15 is configured to abut against the lower surface 33 of the shaft guide 32. Further, studs 34 and 35 are fixed to both sides of the shaft retainer 31 and the shaft guide 32, respectively.
A spring 36 is stretched between the stud 34 and the stud 35. Also, the shaft guide 32
An adjusting screw 37 is screwed through the shaft guide 32, and the tip of the adjusting screw 37 is brought into contact with the shaft retainer 31. Note that 38 is a fixing screw for fixing the shaft retainer 31 to the pick-up base 8. Therefore, the shaft guide 32 receives a force from the spring 36 that tends to move toward the shaft stopper 31, but by adjusting the adjustment screw 37, it is set at a predetermined position with the shaft stopper 31. However, the lower surface 33 of the shaft guide 32 is in contact with the shaft 15, and since the lower surface 33 is formed as an inclined surface, the adjusting screw 3
7, the pick-up base 8 can be rotated about the shaft 14 as the rotation center axis. Therefore, by adjusting the adjustment screw 37, the shaft guide 32
When the pick-up base 8 is positioned away from the shaft retainer 31, the pick-up base 8 is rotated clockwise in FIG. When the shaft guide 32 is moved in the direction of the shaft retainer 31, the pick-up base 8 is rotated counterclockwise.
The optical axis can be adjusted tangentially.

As described above, the optical axis radial direction adjustment section 26 and the optical axis tangential direction adjustment section 27 are provided independently, and by these adjustments, the optical axis of the pickup 4 is adjusted in the radial direction and the tangential direction, respectively. hand,
It is held exactly perpendicular to the surface of the disk 1. Also, the motor 22 is driven to pick up the pick-up 4.
Even when the pickup 4 is moved in the radial direction of the disk 1, the optical axis of the pickup 4 is maintained perpendicular to the surface of the disk 1.

As explained above, according to the optical information reading device of the present invention, the optical axis radial adjustment section is provided between the pick-up mounting bracket and the pick-up base and adjusts the optical axis of the pick-up in the radial direction; By independently providing an optical axis tangential direction adjustment section that is installed between the slide shaft and adjusts the optical axis of the pick-up in the tangential direction, the optical axis of the pick-up can be accurately perpendicular to the surface of the disk. It has the advantage that it can be adjusted, its state can be maintained even while the pickup is being moved, and its structure is simple and can be miniaturized.

[Brief explanation of the drawing]

FIGS. 1a, b, and c are a perspective view of an embodiment of the present invention, a perspective view of essential parts, and a sectional view of FIG. 1b. Second
Figures a, b, and c are a front view, a plan view, and a side view of the main parts of an embodiment of the present invention. 1...Disk, 4...Pickup, 5...
Pick-up holding mechanism, 6... Pick-up moving mechanism, 7... Pick-up mounting bracket, 8... Pick-up base, 10... Hinge pin, 14 and 15... Slide shaft, 26... Optical axis radial adjustment section, 27... Optical axis tangential adjustment section.

Claims (1)

[Scope of utility model registration request] An optical information reading device comprising a pick-up that projects light onto the information recording disk surface and reads information from the information recording disk using the reflected light, and sequentially reads information by moving the pick-up in the radial direction of the information recording disk, a pick-up base that holds a pick-up mounting member to which a pick-up is fixed rotatably in the radial direction of the information recording disk; a first slide shaft for guiding movement of the pick-up base in the radial direction; and the pick-up base. a second slide shaft for guiding the movement of the pick-up mounting member; a second optical axis adjustment means that contacts the first slide shaft and is capable of changing the distance between the first slide shaft and a portion of the pick-up base that opposes the first slide shaft; An optical information reading device comprising: