DE6604097U - PHOTOELECTRIC CLOCK DEVICE - Google Patents

Description

Photoelectric clock device

The "hot fence" refers to a photoelectric clock device, in the case of the generation of clock pulses a bundle of light after passing the clock track of a Sakt disc and A diaphragm falls on a photo element, through which the brightness fluctuations of the light beam in a known manner electrical clock pulses are converted.

Such clock devices are used particularly in punch card scanners. In them there is one per punched card column

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Clock required to query the perforated information. This transfer clock can be selected from a large number of clock pulses e.g. 8 or 16 impulses per punched card column, in order to obtain a sufficiently small allocation error to the scanned information. Because of this, it is high Clock frequency required.

Photoelectric clock devices consist e.g. of a rotating clock disk on which a clock track consisting of Slots and webs, is appropriate. Immediately behind the clock track is a comb-like aperture corresponding to the clock track arranged. A light beam falls from a lamp onto the clock track and is illuminated through several slits in the clock track and the aperture the photo element attached behind the aperture »Several slots of the clock track and aperture are used, in order to obtain sufficiently high photo currents. A high Clock frequency can be achieved by dividing the clock track very finely into slots and webs. By etching can z.S. Create web and slot widths of less than 0.3 mm. However, this method is manufacturing technology Limits. Another way to increase the clock frequency is to use an additional electronic one Provide frequency multiplication circuit. However, this is complex and prone to failure in the event of speed fluctuations. With a mechanical transmission gear could also achieve a clock frequency increase. But because of

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Drive play and noise Hachteile.

By contrast, the renewal is optically enables a clock frequency increase. It is from the above-described known photoelectric clock device went out. The clock frequency increase is drlyrch achieves that the lamp and the photo element are arranged on one side of the timing disc that on the other Side of the timing disc a device is arranged through which the light beam after passing the slots of the timing disc deflected by 180 ° and then meets part of the clock track again, and that this part of the clock track is used as an aperture.

By means of such a device, the double clock frequency can be achieved compared to the conventional iSotoolectric clock device can be achieved. The device for deflecting the O light bundle (deflecting device) can consist of glass fiber optics or an optical deflection system with prisms. The deflection device must be both with respect to the entry and exit areas are located directly in front of the timing disc. It must be arranged in relation to the timing disc be that the emerging image at the exit surface is symmetrical to the center perpendicular of the deflecting device Projected image on the entrance surface Image of the clock track is.

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The inclination is explained in more detail using an exemplary embodiment explained.

Figure 1 shows a section of the timing track of the timing disc, Figure "> shows the schematic representation of the embodiment" - example,

FIG. 3 shows the entry and exit surfaces of the deflection device in relation to the clock track of the clock disk.

In the figures, the same parts are given the same reference numbers named"

In Figure 1, a section of the clock track of the timing disc 1 is shown. The clock track consists of webs 2 and slots 3.

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In Figure 2 is 4 Gin section through a section of the clock

track. A bundle of light 5 falls from the lamp 6 onto the tactical track 4, passes through its slots 3 and hits the deflecting device 7. The deflecting device 7 could consist of an optical system of prisms. Such a system is only suitable for deflection if exactly parallel light is used

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optically aligned. Such "light guides" are available as flexible bundles or rigid, straight rods. Eighth to during installation and during bending of the glass fiber bundle to ensure that no distortion occurs, 7 a symmetrical image of the benefit to the isintrittsflache 10 image, Figure 3 · Based shows up on the exit surface 9 of the light guide to the Saktscheibe 1 gum light guide 7 so as to _f that the fact track 4 is moved both close to the entry surface 9 and the exit surface 10, FIGS. 2 and 3, the light that falls from the lamp 6 through the slits 3 of the timing disk 1 onto the glass fiber bundle 7 occurs symmetrically from the exit area 10. Depending on the position of the timing disk, a large or small part of the light emerging from the fiber optic bundle 7 is again faded out, which in the case of a photo element 8 arranged behind the timing disk 1 results in a low or high photo current. Since the image 11 of the clock track on the exit surface 10 of the glass fiber bundle 7 moves in the direction opposite to the direction of rotation of the clock disk 1 (see arrows in Figure 3), the lighting of the photo element 8 constantly changes between light and dark at one frequency , which corresponds to twice the number of the photo element 8 pausing slots of the clock track.

With the inventive device can thus double Clock frequency compared to that described as the state of the art

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Fixture with the same number of seat strands in the salt track and the same speed of the timing disk can be achieved. Another advantage of the device according to the invention is in that the comb-like diaphragm is saved.

3 figures

Claims (6)

PA 9/415/504 - 7 - Scliiiti ariijpriiclie 1. Photoelectric clock device in which a light beam from a lamp through the to generate the clock pulses Slots of a clock track made of slots and webs attached to a clock disk and through a Aperture falls on a photo element, characterized in that on one side of the timing disc (1) the lens (6) and the photo element (8) are arranged that a device (7) is arranged on the other side of the clock disk (1) through which the light beam is deflected by 180 ° after passing the slits (3) of the timing disc (1) and then meets part of the clock track (4) again, and that this part of the clock track is used as an aperture 2. Photoelectric clock device according to claim 1, characterized in that the device for deflecting dos Lichtbündelo (Deflection device) (7) is a fiber optic bundle. 3 · Photoelectric clock device according to claim 1, characterized characterized in that an optical deflection system with a prism is used as the deflection device (7). 4. Photoelectric clock device according to claim 2 or 3, characterized in that the entry and exit surfaces PA 9/415/504 - 8 - (9, 10} of the deflection device (?) Several slots (3) of the Beat track covered. 5. Photoelectric clock device according to claim 4 »thereby characterized in that the deflection device (7) closely behind the timing disc (1) is attached. 6. Photoelectrically ^ clock device according to one of the preceding claims , characterized in that the Umlenkvorrichtu - (7) 20 is arranged that the on the exit surface (10) exiting image is a to the perpendicular to the center line of the deflection device (7) symmetrical image of the input surface ( 9) the projected image of the 2-act track is «