DE3112680A1 - Device for striking synchronisation in electronic striking clocks - Google Patents

Abstract

For the purpose of striking synchronisation in electronic striking clocks, the coding of a coding disc which revolves with the wheel works is scanned by means of a phototransistor and by means of light-emitting diodes. The light-emitting diodes are assigned in each case to a coding track, which tracks consist of light-transmitting and light-proof regions. The light-emitting diodes are excited sequentially. If in the process light penetrates via the light-transmitting regions into the interior of the coding disc, which consists of plastic, this fact is detected by the phototransistor, which is arranged on the circumferential surface of the disc.

Description

Device for beat synchronization

in electronic clockwork watches "The invention relates to a Device for striking synchronization in electronic striking clocks with a encoding disk rotating with the pointer mechanism, which has a Carries code that is scanned, the electrical generated by the scan Signals determine the sequence of strokes.

In a known device of the type mentioned above, it rotates Together with the hour hand, a coding disc, the code tracks of which are exchanged from one another consist of electrically conductive and electrically non-conductive surfaces.

Each code track is designed as a sliding track and is controlled by a contact spring scanned. Usually it is a binary coding.

Every hour on the hour, the hammer electronics are scanned Code accessed briefly, with the electrical generated by the scan Signals determine the sequence of strokes. This device is in theirs mechanical Construction sensitive, requires adjustment of the slide springs and is longer Operation not reliable as the sanding tracks can become dirty and wear out. A stroke sequence that does not correspond to the pointer position is then the result.

In the case of angle encoders, it is known to encode the disk photoelectrically to feel. For this purpose, the transparent pane has a code, which from an alternation of translucent and opaque surface areas exists on a disk surface. On one disk surface are in the area of Code tracks light-emitting components arranged in a stationary manner, while on the opposite one Disk surface each stationary light-sensitive in relation to a light-emitting component Components are arranged.

Since every light-emitting component is a light-sensitive component is assigned, the component cost is not insignificant.

There is the task of the device of the type mentioned to be designed in such a way that photo-optical scanning is carried out with the least possible number of components the coding of the coding disk is possible.

This object is achieved with the features of claim 1. Advantageous Refinements can be found in the subclaims.

Exemplary embodiments are described in more detail below with reference to the drawings explained. Show it: Fig. 1 is a circuit diagram of the device circuit used; Fig. 2 is a plan view and a side view of the device; Fig. 3 shows a section through the coding disk in a first embodiment and 4 shows a corresponding section through a second embodiment.

As can be seen in particular from FIG. 2, the coding disk 1 has a coding which consists of a total of 4 coding tracks 2,3,4,5. The coding disk 1 rotates together in synchronism with an hour hand, not shown. before Four light-emitting diodes 6,7,8,9 are arranged on the coding disk.

These fixed diodes 6 to 9 are each a coding track 2 assigned to 5.

A stationary one is directed at the edge 10 of the coding disk 1 Photo transistor 11 arranged.

The coding, consisting of coding tracks 2 to 5, is involved it is a binary code with a specific code key every hour assigned.

The light-emitting diodes are each connected to a line (1), (2), (4) and (8) connected. These lines are connected to the hammer mechanism electronics. Every hour on the hour, the diodes 6 to 9 are successively activated by pulses applied so that first the diode 6, then the diode 7, then the Diode 8 and finally diode 9 lights up.

Lines (1), (2), (4) and (8) are common to one input a gate circuit 12 connected. It is an AND gate. At the The output of the phototransistor 11 is the other input of this gate circuit.

If one of the diodes 6 to 9 lights up and the light generated is passed to the phototransistor 11, then both inputs of the gate circuit 12 are applied and an output pulse occurs at the gate circuit 12.

In contrast, the light generated by one of the diodes 6 to 9 as a result The coding on the coding disk 1 is shielded, so it does not get into the interior of the disk and thus also not to the phototransistor 11, then the remains at the other input Gate circuit 12 emits a signal so that gate circuit 12 also has no output signal generated.

According to Fig. 3, the disc 1 consists essentially of a transparent one Material in which fluorescent substances are embedded. From the light emitting Diodes only diodes 6 and 7 are shown.

The light emanating from the diode 6 hits the one perpendicularly Disc surface 13, and thus penetrates into the interior of the disc 1. The incident Light from the diode 6 is thus absorbed by the pane 1.

That emitted isotropically by the molecules of the fluorescent substances 14 Due to the total reflection, fluorescent light remains on the pane surfaces 13, 15 in the disk 1 and can only emerge on the peripheral surface 10 of the disk. The light emerging at the circumference 10 is detected by the phototransistor 11 and leads this into the conductive state.

If, however, the diode 7 is energized and is located in front of this diode 7 an opaque part of the code track 3, then that emanating from the diode 7 can Light does not penetrate into the interior of the pane 1.

In the phototransistor 11 thus no light is fed, so that this remains in the non-conductive state when the diode 7 is energized.

In the embodiment according to FIG. 4, both disk surfaces 13, 15 of the disc 1 is mirrored. The code tracks 2 to 5 consist of one Change of mirrored and non-mirrored surface areas on the panes area 13. In the example shown, the diode 6 is in front of a non-mirrored one Area of the coding track 2, so that the light emitted by the diode 6 in the inside of the disc 1 can penetrate. On the disk surfaces 13, 15 there is a Total reflection of the penetrated light takes place, which only over the circumference 10 is able to exit and the transistor 11 is applied. When energizing the diode 7, this is located in front of a mirrored surface area of the coding track 3, see above that no light can penetrate into the interior of the pane and the phototransistor 11 remains in the non-conductive state.

Claims (7)

Claims device for beat synchronization in electronic Striking mechanism clocks with a coding disk rotating with the pointer mechanism, which on a disk surface carries a code that is scanned, the by the Scanning generated electrical signals determine the impact sequence, thereby g e k e n n -z e i c h n e t that in the area of the coding tracks (2,3,4,5) light emitting Components (6,7,8,9) are arranged that are successively activated on A light-sensitive component (11) is arranged on the circumference of the disc (1) and on the opposing disk surfaces (13, 15) of the coding disk (1) inside essentially a total reflection of the light emitting components (6,7,8,9) generated and penetrated into the disc interior light prevails. 2. Apparatus according to claim 1, characterized in that g e k e n n -z e i c h n e t that fluorescent substances (14) are embedded in the transparent material of the disc (1) and the coding by alternating between translucent and opaque Surface areas of a disk surface 13 is formed. 3. Apparatus according to claim 1, characterized in that g e k e n n -z e i c h n e t that the disc (1) consists of a transparent material, a disc surface (15! Is mirrored and the coding on the other disk surface (13) consists of a Alternation of translucent and mirrored surface areas is formed. 4. Device according to one of claims 1 to 3, characterized g e k e n n z e i c h n e t that the light-emitting components (6,7,8,9) are light-emitting diodes, their light-emitting surfaces in the direction of the disk surface carrying the coding (13) has. 5. Device according to one of claims 1 to 4, characterized g e k e n n z e i c h n e t that the light-sensitive component (11) is a phototransistor, whose photosensitive surface points in the direction of the peripheral surface (10) of the disc. 6. Device according to one of claims 1 to 5, characterized g e k e n n z e i c h n e t that the lines to which the light emitting components (6,7,8,9) are connected, are at one input of a gate circuit (12), at the other Input the signal output of the light-sensitive component (11) is located. 7. Apparatus according to claim 6, characterized in that g e k e n n -z e i c h n e t that the gate circuit (12) is an AND gate.