JPS5842899Y2 - rotating transducer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a rotary transducer used for frequency setting in receivers such as audio tuners and transceivers.

Conventionally, this type of rotary transducer is fixed to a rotating shaft body 81 and has a slit 8 concentrically formed therein, as shown in FIG.
2, and a distance t between the rotating disk 83 and the rotating disk 83.
A fixing plate 85 fixed through the slit 84 and having a slit 84
It is composed of a light emitting body 86 and a light receiving body 87, which are provided at positions sandwiching the rotating disk 83 and the fixed plate 85. As the rotating disk 83 rotates, both slits 82
When the 840° positions coincide, the light from the light emitting body 86 is received by the light receiving body 8T to obtain a pulse, and this pulse is input to an addition/subtraction counter to detect the position of the rotating disk 83.

However, in the above configuration, since there is a distance t between both slits 82 and 84, the light emitted from the light emitter 86 through the slit 82 of the rotating disk passes through the slit 8 of the fixed plate 85.
By the time the number of slits reaches 4, the number of slits has expanded, making it impossible to increase the number of slits, and there is a limit to the improvement of accuracy.

Further, the light intensity at the end of the spread light is extremely weak, and therefore the rise and fall of the pulse become unclear.

The object of this invention is to provide a rotary transducer that eliminates the above-mentioned drawbacks by bringing a rotating disk into pressure contact with a fixed plate.

Hereinafter, embodiments of this invention will be described based on the drawings.

In FIG. 1, reference numeral 1 denotes a rotating shaft body, which is inserted through a support member 2. As shown in FIG.

Reference numeral 3 denotes a rotating disk fitted to the rotating shaft 1, and as shown in FIG. 2, slits 4 are formed concentrically at predetermined intervals in the rotating disk 3. As shown in FIG.

Reference numeral 5 denotes a fixed plate fixed to the support member 2, and this fixed plate 5 has a third slit corresponding to the slit 4 of the rotating disk 3.
As shown in the figure, two slits 6 are formed.

A rubber body 7 is inserted between one flange 1a of the rotating shaft body 1 and the rotating disk 3.

Reference numeral 8 denotes a spring inserted between the support member 2 and the other flange 1b of the rotary disk 1, which applies a spring force to the rotary shaft body 1 in the axial direction 9 thereof.

10a, 10b and 11a, 11b are the rotating disks 3
As shown in FIG. a, 10 b and two photoreceptors 11at11b
are arranged side by side.

Note that 12 in FIG. 1 is a member that supports one end of the rotating shaft body 1.

FIG. 5 shows the relative positional relationship between the slits 4 of the rotating disk 3 and the slits 6 of the fixed plate 5, and the spacing between the slits 160 of the fixed plate 502 is 1.5 times the spacing between the slits 5 of the rotating plate 3.
It is formed five times.

Then, the two pairs of light emitting and receiving bodies 10a and 11a described in FIG.
.

10b and 11b are arranged in parallel so that their optical axes coincide with the slit 6 of the fixed plate 5.

As a result, when the rotating disk 3 is rotated, as shown in FIG.
The pulses b detected by the two pulses have a phase shift of 90° from each other.

These two pulses a and b, which are out of phase by 900 degrees, are subjected to appropriate arithmetic processing and input to an addition/subtraction counter (not shown) to calculate the rotational direction and rotational position of the rotating disk 3.

By the way, in the above configuration, the rotating shaft body 1 is urged in the axial direction 9 by the spring 8, and with this urging force,
The rotating disk 3 is rotated in the same direction 9 via the 7 flange 1a and the rubber body 7.
The fixed plate 5 fixed to the support member 2 and the rotating disk 3 are brought into close contact with each other.

The frictional force between the rotating disk 3 and the rubber body 7 is greater than the frictional force between the rotating disk 3 and the fixed plate 5, so when the rotating shaft 1 is rotated, the rotating disk 3 hits the fixed plate 5. Rotate while touching.

The rotating disk 3 and the stationary plate 5 may be made of Teflon-treated resin, but metal plates such as stainless steel are recommended because they tend to slip easily.

Further, in the above embodiment, the rotating disk 3 and the fixed plate 5 were brought into close contact with each other.
By interposing an extremely thin plastic sheet such as Teflon or nylon, which has a thickness of about 1.5 m, even though the rotating disk 3 is in pressure contact with the stationary plate 5, it is possible to prevent both from being worn out and extend the service life.

In the above configuration, the rotating shaft body 1 and the rotating disk 3 are connected to the rubber body 70.
Because it is joined by elastic force and frictional force, it is easier to assemble than adhesives or screws, and it can be joined without deforming the rotating disk compared to caulking or press-fitting.

FIG. 7 shows another embodiment, in which a rotating disk 3a forming a radial lattice and a fixed plate 5a are mounted eccentrically to each other.

In this case, moiré fringes 13 generated as the rotating disk 3a rotates are detected.

As detailed above, in the rotating transducer according to this invention, the rotating disk rotates while being pressed against the fixed plate, so the light emitted from the light emitting body from the slit of the rotating disk does not spread. , the spacing between the slits can be reduced, improving accuracy.

In addition, the rise and fall of the pulse are clear,
The amount and direction of rotation can be accurately converted into electrical signals.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of the main parts of the rotating transducer according to this invention, Fig. 2 is a plan view of the rotating disk, Fig. 3 is a plan view of the fixed plate, and Fig. 4 is a plan view of the light emitter and photoreceptor. A perspective view showing the arrangement;
FIG. 5 is a diagram showing the relative positional relationship between the slits in the rotating disk and the slits in the fixed plate, FIG. 6 is a pulse waveform diagram, and FIG. 7 is a plan view of the rotating disk and fixed plate showing another embodiment. FIG. 8 is a sectional view of the main parts of a conventional rotary transducer. 1...Rotating shaft body, 2...Supporting member, 3
...Rotating disk, 4,6...Slit,
5...Fixing plate, 7...Rubber body, 8...
... Spring, 9 ... Axial direction, 10
a t 10 b... Luminous body, 11 a t
1 l b...Photoreceptor.

Claims (2)

[Scope of utility model registration request] (1) A rotating shaft is inserted into a support member to which a fixed plate with slits is fixed, and the rotating shaft has slits formed concentrically at predetermined intervals and corresponding to the slits. Fitting the disc, inserting a rubber body between the seven flange of the rotating shaft and the rotating disc, and applying the spring force of the spring to the rotating shaft in the axial direction,
A rotary transducer characterized in that the rotating disk is brought into pressure contact with the identification plate via the rubber body by the spring force, and further, a light emitting body and a light receiving body are provided between the fixed plate and the rotating disk. . (2) The rotary transducer according to claim 1, wherein the fixed plate and the rotary disk are metal plates.