JPH0741785U - Resin turntable and manufacturing method - Google Patents

Abstract

(57) [Abstract] [Purpose] In a resin turntable for spindle motors used for compact audio discs, etc., the disc inner diameter is supported smoothly and the height and flatness of the turntable after press fitting into the motor The purpose is to stabilize dimensional accuracy. [Structure] By providing a plurality of holes arranged at equal intervals in the circumferential direction on the plane, it is possible to fix the turntable to the motor with screws after press-fitting the turntable.・ It becomes easy to stabilize the dimensional accuracy of flatness. In addition, the conical projections that support the inner diameter of the disk are provided with gate openings on the back surface of each of the projections divided by the holes to allow the resin to flow during resin molding. You get what you did. Further, by providing a step at the portion where the protrusion and the hole are in contact with each other, burrs are eliminated on the surface of the protrusion and the inner diameter portion of the disk can be smoothly supported.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a resin turntable for a spindle used in a compact disc for audio, a CD-ROM, and others.

[0002]

[Prior art]

 In recent years, the demand for resin turntables has increased because they are cheaper and easier to mold than metal turntables. However, the precision and strength are required to be equivalent to those made of metal.

A conventional resin turntable will be described below. 2 and 3 show the structure of a conventional resin turntable.

In FIG. 2, 1 is a hole for press-fitting the shaft of a motor, 22 is a protrusion for supporting the inner diameter of the disk, and 23 is a position corresponding to a gate port for pouring resin during resin molding.

The operation of the resin turntable configured as above will be described below.

First, when there is no hole on the plane of the turntable as shown in FIG. 2, after fixing the motor to an arbitrary chassis with screws, the turntable is press-fitted.

Next, in FIG. 3, 1 is a hole for press-fitting the shaft of the motor, 32 is a protrusion for supporting the inner diameter of the disc, and 33 is a position of a gate opening provided in a molding die for pouring resin during resin molding. , 34 are holes for screw fixing.

[0008]

However, in the above-described conventional configuration, since there is no hole on the plane of the turntable, it is difficult to press fit the turntable after fixing the motor to any chassis with screws. The dimensional accuracy of the height and flatness of the turntable becomes unstable and deteriorates. When the gate port is arbitrary, the dimensional accuracy of the turntable as a whole and the dimensional accuracy of the conical protrusion that supports the inner diameter of the disc are not stable and deteriorate. In addition, burrs appear at the part where the hole on the turntable plane contacts the conical projection that supports the disc inner diameter during resin molding, so when supporting the disc inner diameter the disc inner diameter is caught in the middle. Had the problem of.

The present invention solves the above-mentioned conventional problems, and a resin capable of smoothly supporting the inner diameter portion of a disk by improving the dimensional accuracy and strength of each portion, including a protrusion that supports the inner diameter portion of the disk. The purpose is to provide a turntable.

[0010]

[Means for Solving the Problems]

 In order to achieve this object, the resin turntable of the present invention has a structure in which a plurality of holes are arranged on the plane at equal intervals in the circumferential direction. Further, a gate opening is provided in a molding die for pouring the resin at the time of molding the resin on the back surface of the protrusion sectioned by the hole. In addition, a structure is provided in which a step is provided at a portion where a plurality of holes arranged at equal intervals in the circumferential direction on the plane are in contact with a conical protrusion supporting the inner diameter of the disc.

[0011]

[Action]

 With this configuration, after the turntable is press-fitted into the motor, it can be screwed and fixed to any chassis, so that the height and flatness of the disk can be easily stabilized. Further, during resin molding, the resin smoothly flows into the conical projection that supports the inner diameter of the disk, and resin molding with stable dimensional accuracy and strength can be performed. Then, there is no burr on the surface of the conical protrusion that supports the inner diameter portion of the disc, and the inner diameter portion of the disk can be smoothly supported.

[0012]

【Example】

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

In FIG. 1, 1 is a hole for press-fitting a shaft of a motor, 2 is a protrusion for supporting an inner diameter portion of a disk, 3 is a position of a gate port for pouring resin during resin molding, and 4 is A plurality of holes 5 for screwing are provided at equal intervals in the circumferential direction on the plane, and 5 are holes provided at equal intervals in the circumferential direction on the plane, and a conical projection for supporting the inner diameter of the disc. It is a step provided at the portion where the parts contact.

The operation of the resin turntable configured as above will be described. First, by arranging a plurality of holes at equal intervals in the circumferential direction on the plane of the turntable, it is easy to fix the motor to the chassis with screws after pressing the turntable into the motor. In addition, by providing a gate opening in the molding die for pouring resin at the time of resin molding at the place corresponding to the back surface of the protrusion divided by the hole, the dimensional accuracy and strength of the protrusion are stabilized. You can do well. Also, by providing a step at the part where a plurality of holes arranged at equal intervals in the circumferential direction on the plane and the conical protrusions that support the inner diameter of the disc come into contact, burrs are produced on the surface of the protrusions. Since molding can be performed without doing so, the inner diameter portion of the disk can be smoothly supported.

As described above, according to the present embodiment, by disposing the holes at equal intervals in the circumferential direction on the plane, it is possible to easily fix the screw with the turntable pressed into the motor. Also, by providing a gate opening in each molding die at a location corresponding to the back surface of the protrusion sectioned by the hole, the resin will flow smoothly during resin molding, and dimensional accuracy and strength will be stabilized, I was able to do well. By forming a step at the portion where the protrusion and the plurality of holes are in contact with each other, burrs can be eliminated, and the inner diameter of the disc can be smoothly supported.

[0016]

[Effect of device]

 As described above, according to the present invention, by arranging the holes at equal intervals in the circumferential direction on the plane, it becomes easy to fix the motor with screws after press-fitting the turntable, and the holes are separated on the back surface of the protrusion. A resin turntable with stable dimensional accuracy and strength can be realized by providing a gate opening in each molding die at the corresponding portion. Further, by providing a step at the portion where the protrusion and the plurality of holes are in contact with each other, there is no burr on the surface of the protrusion and it is possible to realize a resin turntable capable of smoothly supporting the inner diameter portion of the disk.

[Brief description of drawings]

FIG. 1 is a structural diagram of a resin turntable of the present invention.

[Fig. 2] Structural diagram of a conventional resin turntable

FIG. 3 is a structural diagram of a conventional resin turntable having holes for screwing.

[Explanation of symbols]

 1 Motor shaft holding slot 2,22,32 Disk inner diameter support projection 3,23,33 Position corresponding to gate port 4,34 Motor screw fixing hole 5 Burr step

Claims (3)

[Scope of utility model registration request] 1. A hole for press-fitting a shaft of a motor in a central portion, a conical projection portion for supporting an inner diameter portion of a disk in a central portion, and a plurality of holes arranged at equal intervals in a circumferential direction on a plane. Resin turntable. 2. A portion of the circumference of a plurality of holes arranged at equal intervals in the circumferential direction on a plane, along the tangent line that intersects with a conical projection portion that supports the inner diameter portion of the disk, The resin turntable according to claim 1, further comprising a step from the surface of the protrusion. 3. A conical protrusion for supporting an inner diameter of a disc is divided by a plurality of holes arranged at equal intervals in a circumferential direction on a plane, and a resin is formed on the back surface of each of the divided protrusions. A method of manufacturing a resin turntable in which a molding die is provided with a gate opening for pouring resin during molding.