JPS629535Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a pick-up device for optically reading out information recorded in a spiral or concentric pattern on a recording medium, and in particular relates to an optical axis of an optical system built into the pick-up device. It's about coordination.

Conventionally, in a pickup device for optically reading information from a recording medium, it has been necessary to adjust the optical axis of the pickup device optical system with respect to the recording medium in order to satisfy various characteristics of the pickup device.

SUMMARY OF THE INVENTION Therefore, the object of the present invention is to provide a pickup device which is capable of adjusting the optical axis of the optical system of the pickup device with a simple configuration.

An embodiment of the present invention will be described below with reference to the drawings.

Fig. 1 is a perspective view showing one embodiment of the present invention;
The figure is a side view of the same, where D is a recording medium, 1 is a turntable on which the recording medium D is placed, 2 is a spindle motor for driving the turntable 1, 3 is a pick-up main body, and 4 is installed in the pick-up main body 3. 5 is the first mount, 6 is the second mount, 7 is the adjustment fulcrum attached to the first mount 5 via the second mount 6, and 8 is the first mount 5 and the second mount. 2
A compression spring 9 inserted into the mounting base 6 is a first adjustment screw, and is arranged in the tracking direction of the pickup main body 3 [radial direction of the recording medium D including the adjustment fulcrum 7]. Reference numeral 10 denotes a second adjustment screw, which is arranged in the tangential direction of the information track of the recording medium D including the adjustment fulcrum 7. Reference numerals 11 and 12 denote first and second coil springs, which are inserted into the first adjustment screw 9 and the second adjustment screw 10, respectively.

Next, the optical axis adjustment operation in the pickup device having such a configuration will be explained.

Now, if the optical axis of the optical system of the pickup main body 3 is deviated in the tracking direction (radial direction of the recording medium D), the first adjustment screw 9
by tightening or loosening the first mounting base 5.
The positional relationship of the second mounting base 6 changes, and the pickup main body 3 slightly rotates about the tangent line containing the second adjustment screw 10. This slight rotation causes the optical axes of the incoming and reflected light of the optical system to coincide. Similarly, if the optical system of the pickup main body 3 is deviated in the tangential direction of the information track of the recording medium D, the second adjustment screw 10
By tightening or loosening, the pickup main body 3 slightly rotates about the normal line of the recording medium D including the first adjustment screw 9. Furthermore, the variation in the distance a between the objective lens 4 and the recording medium D during such slight rotation is minute and does not cause any trouble.

As detailed above, according to the present invention, in a pickup device for optically reading out information recorded in a spiral or concentric pattern on a recording medium,
It is equipped with a mount to which the pick-up main body having an optical system is attached, a fulcrum provided on the mount, and an adjustment mechanism arranged on a line orthogonal to each other around the fulcrum.One adjustment mechanism adjusts the light of the pick-up main body. The axis is adjusted in one direction, and the other adjustment mechanism is used to adjust the optical axis of the pick-up main body in a direction perpendicular to the aforementioned direction, so the optical axis of the optical system can be reliably adjusted with a simple configuration. Adjustments can be made.

In addition, Utility Model Application No. 58-109835, which was filed earlier than this application,
The specifications and drawings of the same issue also show the angle adjustment mechanism of the pick-up device similar to the invention of the present invention, but the fixing screw that screws together the slider (corresponding to the second mount of the invention of the present invention) and the mount and the angle adjustment mechanism are shown. However, in the present invention, the screwing of the two mounting bases and the angle adjustment are achieved with one screw, simplifying the structure.

[Brief explanation of the drawing]

The drawings all show one embodiment of the present invention, with FIG. 1 being a perspective view and FIG. 2 being a side view. 3...Pickup body, 5,6...Mounting stand,
7... Adjustment fulcrum, 9, 10... Adjustment screw.

Claims (1)

[Scope of utility model registration request] In a pick-up device for optically reading information recorded in a spiral or concentric form on a recording medium, a first mounting base for mounting a pick-up main body having an optical system, and the first mounting base are rotatable. a second mount having a fulcrum supporting the mount, and a pair of adjustment mechanisms arranged on lines perpendicular to each other around the fulcrum, the adjustment mechanism screwing the first and second mounts together; and a coil spring mounted on the adjustment screw between the first and second mounting bases,
The one adjustment mechanism adjusts the optical axis of the objective lens of the pickup main body in one direction, and the other adjustment mechanism adjusts the optical axis in a direction perpendicular to the direction. A pick-up device.