JPS63166082A - Standard sheet - Google Patents

Abstract

PURPOSE:To arrange a reference signal at a position where the least influence of decentering is given, by providing an abutting part which decides the positioning of rotation being abutted with a spindle and an elastic member which presses the abutting part on the spindle in the rotational center of a rotary magnetic sheet, and recording the reference signal at the position perpendicular to a pressing direction. CONSTITUTION:A center core 2 has a hole 3 to be engaged with the spindle 20, and presses the abutting part 4 on the spindle 20 with the elastic member 5 at the time of abutting with the spindle 20, and performs the positioning of the rotational center of a magnetic sheet 1 and that of the spindle 20. The reference signal is recorded at the position of D or E perpendicular to the pressing direction of the elastic member 5, that is a direction of arrow head (m) by detecting the rotational phase of the magnetic sheet 1 by a PG pin 6. Thus, it is possible to obtain a standard sheet from which the influence of the decentering is eliminated by recording the reference signal at the position of D or E.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a standard sheet used for adjustment or reference of a rotating magnetic sheet device having an annular track such as an electronic still camera.

2. Description of the Related Art In the conventional standard sheet shown in FIG. 4, for example, a recording track 101 is configured in a ring shape with a radius r centered at the center A during recording, and a standard signal is reproduced on the recording track 101 with the center A at the time of recording. fAA, which connects the central aperture, is recorded at a head position at an angle θ from B. This head position is
Since the angle θ is not controlled, it becomes random, and the azimuth angle α that occurs when the center A during recording and the center aperture during reproduction are eccentric by δ also becomes random.

Problems to be Solved by the Invention However, in the conventional standard sheet shown in FIG. 4 as described above, the azimuth difference α that occurs when the recording center A and the reproduction center opening are eccentric by δ is, for example, δ=0.01 rm. , radius r=15m, θ=900, azimuth difference a=2.
3', resulting in an azimuth difference of 2' or more due to eccentricity alone, making it impossible to read the azimuth angle accurately, and causing the problem that it is not suitable for handling minute azimuth angles.

Means for Solving the Problems In order to solve the above problems, the standard sheet of the present invention is a rotating magnetic sheet that engages with a spindle that rotates a magnetic sheet provided in a magnetic recording or reproducing device, and is used as a rotating magnetic sheet for magnetic recording or reproducing. The sheet includes, at the rotation center of the rotating magnetic sheet, a contact portion that contacts the spindle when engaged with the spindle and positions the rotation of the rotating magnetic sheet;
A center core is provided having an elastic member that presses and abuts the abutting portion against the spindle, and the elastic portion is located at a position perpendicular to the direction in which the abutting portion is pressed against the spindle. It is configured to record standard signals.

Effects of the present invention With the above-described configuration, by determining the position of the standard signal with respect to the center core that positions the standard sheet, it is possible to arrange the standard signal at a position that is least affected by eccentricity of the standard sheet, Since the azimuth difference due to eccentricity is eliminated, the azimuth angle can be adjusted with high accuracy.

EXAMPLE Hereinafter, a standard sheet that is not affected by eccentricity according to an example of the present invention will be described with reference to the drawings.

Figure 1 shows the configuration of the rotating magnetic sheet used in the embodiment of the present invention, Figure 2 is a sectional view showing the engagement of the center core and spindle, and Figures 3 (a) and (b) show the H1 standard signal pattern. It is something. 1 is a magnetic sheet, 2 is a center core provided at the center of the magnetic sheet 1, and as shown in FIG. When engaged, the contact portion 4 is pressed against the spindle 20 by the elastic member 5,
The center core 2 is provided with a PG bin 6 for positioning the rotation center of the magnetic sheet 1 and the rotation center of the spindle 2o, and for detecting the phase of rotation of the magnetic sheet 1. The rotating magnetic sheet configured as described above has annular tracks.

The standard signals 7, 8, 9, and 10 shown in Figure 3 (,) are burst signals of azimuths -a', -b', 10b', and +a', respectively, and these are applied to the magnetic sheet 1 at the PG pin 6.
3 (b ) is recorded at a position with a phase difference of 90° or 270° from the detection signal 11 of PG pi/6. By recording the standard signal at position D or E as described above, a standard sheet can be obtained in which the influence of eccentricity is eliminated.

Advantages of the Invention As described above, according to the present invention, it is possible to easily create a standard sheet that is not affected by eccentricity, and it is possible to obtain excellent effects such as being able to adjust and detect azimuth with high precision.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a rotating magnetic sheet according to an embodiment of the present invention, FIG. 2 is a sectional view showing engagement between a center core and a spindle,
FIG. 3 is a waveform diagram showing a standard signal pattern, and FIG. 4 is a schematic diagram showing the occurrence of azimuth due to conventional eccentricity. 1... Magnetic sheet, 2... Center core,
4... Contact portion, 5... Elastic member, 6-
...-PG pin, 2゜...center core. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 Figure 1-place person, -16--
-v, q-core man 2 Figure E Kl area beech/υ

Claims (1)

[Claims] A rotating magnetic sheet that engages with a spindle that rotates a magnetic sheet provided in a device for magnetic recording and reproducing, and performs magnetic recording or reproducing, the rotating magnetic sheet having a rotation center that includes a magnetic sheet when engaged with the spindle. A center core is provided, the center core having a contact part that contacts the spindle and positions the rotation of the rotating magnetic sheet, and an elastic member that presses the contact part to contact the spindle, and the elastic member A standard sheet, characterized in that a standard signal is recorded at a position perpendicular to a direction in which the contact portion is pressed against the spindle.