JPH0743718U - Self-aligning turntable - Google Patents

Abstract

(57) [Summary] [Purpose] Place the optical disk flat on the turntable. [Structure] When a disc is placed automatically or manually directly on a turntable, and the disc is placed on a self-centering turntable of a player who plays an LD or CD that clamps the disc with a disc stabilizer or the like. , An elastic protrusion that allows stable mounting without disc wobbling is provided, and the disc holds the disc horizontally before it touches the turntable and descends. Can be placed while aligning.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a disc aligning type turntable used for a disc mounting portion of a disc player.

[0002]

[Prior art]

 Fig. 4 shows a conventional disc-centering turntable for a disc player. The right half of FIG. 4 is a side view showing the outer shape, and the left half is a side sectional view showing the internal structure. The turntable 1 has a table portion on which a disc is placed, and is fixed to a shaft 2 which transmits a rotational driving force from a spindle motor or the like. The disc guide portion 4 is held by a spring 5 installed in a recess of the turntable 1 so as to be vertically movable. The shaft 2 penetrates the disc guide portion 4, and a stopper 3 for holding the disc guide portion 4 is fixed to the upper end portion of the shaft 2. When the disc is placed on the turntable 1, the center hole of the disc is inserted into the disc guide portion 4, and a stabilizer portion (not shown) acting to press the disc onto the turntable 1 from above the disc guides the disc. The portion 4 is pressed down to a position corresponding to the outer diameter that fits the center hole of the disc, and holds the disc while aligning it.

[0003]

[Problems to be solved by the device]

 In order to reproduce high quality sound in a compact disc player for audio, the conventional pull-out loading mechanism is eliminated and the compact disc is placed directly on the turntable by hand like a record player. To use. At this time, a self-aligning turntable is generally used to suppress the eccentric component of the disc as much as possible.

However, according to this method, the disc rides on the disc guide portion and becomes in an unstable state in which it tilts until the disc portion is pressed by the stabilizer portion, and further rattling occurs in the vertical direction. As a result, the outer periphery of the disc comes into contact with parts other than the turntable, and as shown in Fig. 3, the disc is pressed against the rubber sheet 12 that holds the slip of the disc on the turntable surface. As a fulcrum, the disc guide was pushed down by the disc, and the disc could not be centered and could be clamped in a misaligned state. An object of the present invention is to provide a self-aligning type turntable which eliminates an unstable tilt of the disc when the disc is placed in the self-aligning type turntable and ensures reliable self-aligning.

[0005]

[Means for Solving the Problems]

 The self-aligning turntable according to the present invention is a disc guide unit having a rotary shaft, a turntable unit fixed to the rotary shaft, and a taper unit for aligning a disc that slides coaxially with the rotary shaft. In the self-aligning turntable having the above-mentioned structure, a protrusion made of a low friction member protruding from the turntable surface that can be moved up and down by a spring is provided on the upper surface of the turntable portion.

[0006]

[Action]

 According to the present invention, when the disc is placed on the turntable part, the disc is kept horizontal by being held by the plurality of pins or the cylindrical part before riding on the disc guide part, and the disc is slid horizontally. It is easy to move and stable and reliable automatic alignment can be performed.

[0007]

【Example】

 FIG. 1 shows a cross-sectional view of an embodiment according to the present invention. The turntable portion 1 has a disk holding portion on the outer peripheral portion thereof, and has a cylindrical concave portion coaxial with the rotation shaft other than the holding portion, and is fixed to the rotation shaft. In addition, the disc guide portion 4 having a taper portion that can move in the direction coaxial with the rotation axis and the cylindrical recess of the turntable portion are inserted into the cylinder portion coaxial with the rotation axis provided on the outer circumference of the disc guide portion. As a guide, it is composed of a cylindrical disk holder 7 as a projection that can slide up and down and protrudes by an amount H of projection from the turntable 1, and a spring member 8 that biases the disk holder upward. .

In order to reduce friction with the disc, the upper surface of the disc holder portion has a mirror-finished surface, or a low friction member is attached. Further, the upper part is restricted by the step difference in the lower part of the taper of the disc guide part, and the protrusion amount H from the upper surface of the turntable part is the height H corresponding to the taper part which effectively acts on the centering of the disc of the disc guide part 4. 'Is equal to or greater than. In the self-centering type turntable having the above-mentioned structure, the disc holder portion 7 serves as a protrusion so that the disk is kept horizontal and stable and reliable centering can be performed.

As another embodiment of the present invention, as shown in FIG. 2, three disk holder pins 9 are concentrically projected at a position corresponding to the disk holder portion 7 of FIG. 1 at equal intervals. It is provided as a protrusion. The disc holder pin 9 is inserted into a cylindrical hole formed in the turntable portion at three positions parallel to the rotating shaft at equal intervals, and the height H is set by the lower portion of the disc holder pin 9 and the step of the cylindrical hole. . Further, a spring member 10 for pressing the disc holder pin 9 upward is enclosed in each cylindrical hole, and a lower portion thereof is closed by a cap 11. As shown in FIG. 3, when the disc 6 is placed on the non-slip rubber sheet 12 provided on the turntable 10, the disc holder pins 9 on the protrusions support the disc 6 in a substantially horizontal plane and the elasticity of the spring member 10 is gradually increased. Against this, the center of the disc 6 and the center of the turntable 1 are aligned with each other by descending the slope of the disc guide 4. Since the protrusions are made of a low friction material, the disk 6 is easy to slide in the horizontal direction, so that the centering is automatically performed.

[0010]

[Effect of device]

 According to the self-centering type turntable of the present invention, it is possible to eliminate the unstable inclination of the disc and to perform a stable self-centering until the centering is performed after the disc is held in a substantially horizontal state by the protrusion. it can.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a view showing another embodiment of the present invention.

FIG. 3 is a view showing a state in which a disc is placed.

FIG. 4 is a side view showing a conventional example.

[Explanation of symbols]

 1 Turntable 2 Shaft 3 Stopper 4 Disc Guide Part 5 Spring 6 Disc 7 Disc Holder Part 8, 10 Spring Member 9 Disc Holder Pin 11 Cap 12 Rubber Sheet

Claims (1)

[Scope of utility model registration request] 1. A self-aligning type having a rotary shaft, a turntable portion fixed to the rotary shaft, and a disc guide portion having a slanted surface that slides coaxially with the rotary shaft and guiding the disc as a center. In the turntable, the turntable portion has an upper surface having a protrusion that is coaxially projected by a spring member that is arranged coaxially with the rotating shaft, and the contact surface between the protrusion and the disk is in a low friction state. Self-aligning turntable.