JPH036147Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a light emitting element mounting device for an index sensor used in a floppy disk drive motor.

Conventional configuration and its problems Normally, in a floppy disk device, an index sensor is used for the purpose of detecting the rotational position of the disk in order to specify the starting position for writing and reading data.

Conventionally, this index sensor consisted of a light emitting diode and a phototransistor, which were fixed to the chassis body on the set side with adhesive, etc., but recently, set manufacturers have reduced the number of installation steps, and the spindle part of the disk rotation motor. Due to the need for improved positional accuracy, etc., there is an increasing demand for incorporating light emitting diodes directly into disk drive motors.

However, in order to incorporate the light emitting diode into the drive motor, there are the following problems in installation.

(1) The light emitting diode mounting position is directly above the magnetic circuit for driving the motor, and holes for mounting and positioning cannot be easily provided.

(2) Positional accuracy with the spindle is required,
and must be securely fixed.

Figures 1 and 2 are diagrams showing how to attach a conventional index sensor to a floppy disk device. In the figure, 1 is a light emitting diode, and a phototransistor 2 is arranged opposite to this. The light emitting diode 1 and the phototransistor 2 are fixed to the main body chassis 3 with an adhesive (not shown) or the like. Further, the disk 4 has an index hole 5, and the position of the index hole 5 is detected by a light emitting diode 1 and a phototransistor 2. Reference numeral 6 denotes a drive motor, which is fixedly attached to the main body chassis 3 by engaging with the outer diameter of a protrusion provided on a housing (not shown). The disk 4 is held by a collet 8 arranged on the set side.

Therefore, the disk center has a structure that coincides with the center of the spindle 7. With this structure, the center of the light emitting diode 1 and the phototransistor 2 and the position of the index hole 5 will be misaligned due to the accuracy of the mounting position of the motor.

Purpose of the invention The present invention has been made in view of the above-mentioned drawbacks of the conventional art, and it is an object of the present invention to provide a light emitting element mounting device for an index sensor that is inexpensive and easy to assemble.

Structure of the invention The present invention has a holder that holds a light emitting diode for indexing, which is fitted into the fitting groove of the housing configured in the motor spindle and fixed, so that the spindle can be mounted independently of the mounting accuracy with the main body chassis. This ensures the positional accuracy of the light emitting diode with respect to the center.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 3 to 5. Note that the same components as those of the above-mentioned conventional device will be described with the same numbers. As shown in the figure, the light emitting diode 1 is inserted into a hole in a holder 9, and is fixed to a relay printed circuit board 10 attached to the holder 9 by soldering. Further, as shown in FIG. 5, the holder 9 is fitted and fixed in a fitting groove of a housing 11 constituting a motor spindle portion. On the other hand, the spindle 7 is machined with high accuracy relative to the housing 11, and therefore the positional accuracy of the holder 9 with respect to the spindle, that is, the positional accuracy of the light emitting diode 1, is extremely high precision.

Further, one end of the relay printed circuit board 10 is soldered to a motor circuit printed circuit board 13 using a conductive square rod 12 to supply current to the light emitting diode 1.

Reference numeral 14 denotes a magnetic circuit component for driving the motor, and no holes, notches, etc. are used for positioning when attaching the light emitting diode.

According to the above embodiment, it is possible to greatly improve the positional accuracy between the light emitting diode 1 and the spindle 7, and the current supply to the light emitting diode 1 is also carried out from the relay printed board 10 to the square rod 12 to the motor circuit printed board 13. The system is designed to improve workability. Furthermore, the structure is such that it does not affect the magnetic circuit for driving the motor in any way. Furthermore, this structure is extremely easy to work with because the light emitting diode 1, housing 11, relay printed circuit board 10, and square bar 12 can be assembled separately, and the above-mentioned assembly can be attached after assembling the motor body. It's summery.

Effects of the invention As described above, according to the invention, it is possible to realize a reliable mounting structure that is inexpensive and has good workability.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view showing the index sensor mounting structure of a conventional floppy disk device;
This figure is a plan view of the same magnetic disk, FIG. 3 is a sectional view showing one embodiment of the present invention, and FIGS. 4 and 5 are enlarged sectional views of the same essential parts. 1...Light emitting diode, 2...Phototransistor,
4... Magnetic disk, 5... Index hole, 6
...Disc drive motor, 7...Spindle, 9...
Holder, 11...Housing.

Claims (1)

[Scope of utility model registration request] A floppy disk drive motor is provided in which a groove is provided in the housing constituting the motor spindle, and a holder having a hole that is engaged and fixed in the groove is provided, and a light emitting diode for indexing is attached to the hole. Light emitting element mounting device for index sensor.