JPH02146155A - Track-zero detecting device for floppy disk device - Google Patents

Abstract

PURPOSE:To simplify the regulation of a track-zero position by providing a member, which sets the detecting position of a detection objective member by a photoelectric sensor means with regulating a light shading area, between a light emitting part and a light receiving part. CONSTITUTION:When a detecting piece 11 of a carriage moves between a light emitting part 12a and a light receiving part 12b, which are arranged at prescribed positions beforehand, light 15 from the light emitting part 12a is shaded, and a track-zero signal is outputted at a position where the piece 11 overlaps with a detecting position setting member 20. In such a case, by the detecting position setting member 20, the shading area from the light emitting part 12a is set, and the detecting position of the detecting piece 11 is set. Consequently, even when each slit between the light emitting part 12a and the light receiving part 12b has slight dispersion, the track-zero detecting position can be surely set.

Description

Detailed Description of the Invention [Objective of the Invention] (Industrial Application Field) The present invention is directed to track zero detection in a floppy disk drive, which detects track zero, which is a reference position when a magnetic head seeks on a recording medium. Regarding equipment.

(Prior Art) Conventionally, in a floppy disk drive (FDD), when a magnetic head seeks on a recording medium immediately after power is turned on, the outermost track zero (track 00) serving as a reference position is used.
A track zero detection device is provided for detecting ).

As shown in FIG. 3, the track zero detection device consists of a detection piece 1 attached to a predetermined position on the side surface of the carriage lO.
It consists of a photoelectric sensor 12 that detects 1. Photoelectric sensor 12
is made of a photo interlayer and is fixed at a predetermined position on the frame 13 of the FDD. Here, the carriage lO is driven by, for example, a lead screw type drive mechanism.
It moves while being guided by rails 14a and 14b, and causes the mounted magnetic head to seek in the radial direction of the recording medium. The charging sensor 12 detects the approaching detection piece 1 when the carriage 10 moves to a position corresponding to track zero.
1 and outputs a track zero signal to the FDD control circuit.

By the way, as shown in FIG. 2, the photoelectric sensor 12 consists of a light emitting part 12a and a light receiving part 12b,
A track zero signal is output at the position where one detection eye blocks the light L5 from the light emitting section 12a. In this case, the position detection accuracy when the photoelectric sensor 12 detects the detection piece 11 depends on the fixed position of the photoelectric sensor 12 on the frame 13 and the light emitting part 12.
a is determined by the dimensional accuracy of each slit in the light receiving section 12b. However, since the dimensional accuracy of each slit in the light emitting part 12a and the light receiving part 12b varies widely, difficult position adjustment work is required when attaching the photoelectric sensor 12.

(Problems to be Solved by the Invention) A conventional track zero detection device in an FDD uses a photoelectric sensor 12 that is a photo interrupter. The accuracy of track zero position detection by the photoelectric sensor 12 depends on the dimensional accuracy of each slit in the light emitting section 12a and the light receiving section 12b.

However, since there are many variations in the dimensional accuracy of each slit, it is difficult to install the photoelectric sensor 12 at a difficult position:
Work is required.

SUMMARY OF THE INVENTION An object of the present invention is to provide a track zero detection device for a floppy disk device, which allows the position adjustment of track zero to be performed relatively easily, thereby improving the efficiency of the assembly process. be.

[Structure of the Invention] (Means and Effects for Solving the Problems) The present invention detects a light emitting part and a light receiving part, and detects the detection object at a timing when the detection target member blocks the light generated from the light emitting part when the carriage moves. In a track zero detection device equipped with a photoelectric sensor means for outputting a track zero detection signal, the detection target member is detected by the photoelectric sensor means, which is arranged between a light emitting part and a light receiving part, and adjusts a light blocking area. This device has a detection position setting member for setting a position.

With such a configuration, the track zero position detection adjustment can be easily and reliably performed without being significantly influenced by the dimensional accuracy of each slit in the light emitting section and the light receiving section.

(Example) The present invention will be described in detail below with reference to the drawings. FIG. 1 is a plan view showing the configuration of the track zero detection device of the same embodiment. As shown in FIG. 1, the track zero detection device of the same embodiment is composed of a photoelectric sensor 12, which is a photointerrupter, having a light emitting part 12a and a light receiving part 12b.
It is fixed in place on the DD (see Figure 3). The photoelectric sensor 12 detects a state in which light 15 emitted from the light emitting part 12a is received by the light receiving part 12b, and a state in which the light 15 emitted from the light emitting part 12a is received by the light receiving part 12b.
The light receiving section 12b is configured to output a track zero signal, which is an electrical signal, when the light receiving section 12b is interrupted. Further, in this embodiment, a detection position setting member 20, which is integrated with the frame 13, for example, is provided between the light emitting part 12a and the light receiving part 12b of the photoelectric sensor 12.

The detection position setting member 20 is a member for blocking part of the light 15 generated from the light emitting part 12a and adjusting and setting the detection position of the detection piece 11.

Next, the operation of this embodiment will be explained. The photoelectric sensor 12 is
When the detection piece 11 of the carriage IO moves between the light emitting part 12a and the light receiving part 12b and interrupting the light 15 from the light emitting part 12a, a track zero signal is output from the light receiving part 12b. Here, as shown in FIG. 3, the carriage IO moves in the radial direction of the recording medium and causes the mounted magnetic head to seek over the recording medium.

Here, when the magnetic head seeks to the track zero position of the recording medium, the photoelectric sensor Adjust the 12 fixed positions. In the same embodiment, the detection piece 11 is connected to the detection position setting member 2.
It is configured to block the light I5 from the light emitting section 12a at the position overlapping with the light emitting section 12a. That is, the position of the end surface 20a of the detection position setting member 20 becomes the detection position of the detection piece 11 by the photoelectric sensor 12.

In this way, when the detection piece 11 of the carriage 10 moves between the light emitting part 12a and the light receiving part 12b arranged in advance at a predetermined position, the light emitting part 12a The light 15 from the track is blocked and a track zero signal is output. In this case, the detection position setting member 20 sets a blocking area for the light 15 from the light emitting part 12a, and sets the detection position of the detection piece it. Therefore, the light emitting section 12a and the light receiving section 12b
By forming each slit relatively wide in advance, it becomes possible to adjust the detection position of the detection piece 11 by the position of the detection position setting member 20. In other words, even if there is some variation in the dimensions of each slit in the light emitting section 12a and the light receiving section 12b, the track zero detection position can be reliably set.

In addition, although in the said Example, the case where the detection position setting member 20 was integrated with the frame 13 of FDD was demonstrated, it is not limited to this and may be comprised by an independent member.

[Effects of the Invention] As detailed above, according to the present invention, in the track zero detection device of a floppy disk device, there is some variation in the dimensional accuracy of each slit in the light emitting part and the light receiving part that constitute the photoelectric sensor. However, due to the detection position setting member,
It is possible to reliably set the track zero detection position between the light emitting section and the light receiving section. Therefore, the track zero detection position can be easily adjusted without requiring difficult work such as increasing the dimensional accuracy of each slit in the light emitting section and the light receiving section. As a result, the efficiency of the device assembly process can be improved.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the configuration of a track zero detection device according to an embodiment of the present invention, FIG. 2 is a plan view showing the configuration of a conventional track zero detection device, and FIG. 3 is a portion of a conventional floppy disk device. FIG. IO... Carriage, 11... Detection piece, 12...
Photoelectric sensor, 12a... Light emitting section, 12b... Light receiving section, 20... Detection position setting member. Applicant's representative Patent attorney Takehiko Suzue No. 1! ! 1 Z 13 figure

Claims (1)

[Claims] The carriage has a magnetic head mounted thereon and a detection target member for detecting track zero at a predetermined position, a light emitting part and a light receiving part, and when the carriage moves, the detection target member is arranged at a predetermined position. a photoelectric sensor means that outputs a track zero detection signal at a timing when light emitted from the light emitting section is blocked; and a photoelectric sensor means disposed between the light emitting section and the light receiving section so that the detection target member detects the light emitted from the light emitting section. and a detection position setting member for adjusting the light blocking area and setting the detection position of the detection target member by the photoelectric sensor means when the track zero detection signal is output by blocking the light. A track zero detection device for a floppy disk device.