CN201353414Y - Tennis game serve out alarm - Google Patents

Abstract

The utility model relates to a tennis game serve out alarm, which comprises two groups of laser transmitters 2 and two groups of laser receivers 6 matched with the two groups of laser transmitters. A receiving and conditioning circuit 7 is configured behind the laser receivers 6. The receiving and conditioning circuit 7 is connected with the signal input end of a buzzer 8. When serving, if the tennis ball touches a laser beam 4, indicating that the fall point of the tennis ball is within the fair territory and the serve is successful, the buzzer 8 does not alarm; if the tennis ball does not touch the laser beam 4 but touches a laser beam 3, indicating that the fall point of the tennis ball is out of the fair territory and the serve is faulted, the buzzer 8 alarms to indicate the serve out. The utility model has the advantages that the judgment accuracy of the referee is improved, the serve out judgment mistake at the tennis game is avoided, the referee can genuinely obtain the goal of justness, openness and accuracy at the tennis game, the structure is reasonable, the installation is simple and the use is convenient.

Description

Tennis tournament fault siren

Technical field

The utility model relates to a kind of tennis tournament siren, belongs to the sports training equipment technical field, is specifically related to a kind of tennis tournament fault siren.

Background technology

Along with tennis universal and development at home, increasing people puts in this motion.Service is a ring very important in the tennis tournament, but because tennis ball speed is very fast, and the penalty of the whether out-of-bounds of serving a ball has proposed near very high requirement, the especially drop point penalty service line to the judge.At present, in general match, only can rely on judge's vision and experience to judge, in international blue-ribbon event, the general high-speed camera that adopts is recorded a video to heat, the form of taking the playback video recording to determine when the dispute ball occurring is come auxiliary judgement, but this covering device costs an arm and a leg, and domestic other match of general level also is not equipped with.Because the judge lacks accurate, portable instrument, the at present this judgement efficient of only making with vision and experience is very low, judges that human factor is very big, the problem of misjudging, failing to judge usually can occur, thereby has influenced the fairness of match.

Summary of the invention

The utility model provides a kind of low price for remedying the deficiencies in the prior art, and is rational in infrastructure, practical and convenient, and whether out-of-bounds of ruling tennis service accurately and rapidly avoid judging the tennis tournament fault siren that misjudgement occurs or fail to judge.

The utility model is finished by following technical measures:

Tennis tournament fault siren, comprise the two groups of generating lasers 2 and the laser pickoff 6 of phase configuration with it, laser pickoff 6 back configurations one receive and modulate circuit 7, reception and modulate circuit 7 are by photodiode 10, I/V change-over circuit 11 and voltage comparator circuit 12 are formed, the signal output part of photodiode 10 links to each other with the signal input part of I/V change-over circuit 11, the signal output part of I/V change-over circuit 11 links to each other with the signal input part of voltage comparator circuit 12, and the signal output part of voltage comparator circuit 12 links to each other with the signal input part of buzzer 8.

The utility model adopts the light source of laser as photoelectric circuit, is that transmission range is distant because lasing beam diameter is very little, and being invisible to the naked eye of people, and speed is fast, the precision height, and range is big, and anti-light, electrical interference ability are strong.

Operation principle of the present utility model is: when service, drop point judges than being easier to that away from service line 5 time when drop point is near service line, the judge will rely on the observation of oneself.During service, if tennis is run into laser beam 4, then the drop point of tennis belongs to good shot in play, and buzzer 8 can not reported to the police; If tennis is not run into laser beam 4, but run into laser beam 3, then the drop point of tennis is out-of-bounds, i.e. fault, and fault is illustrated in buzzer 8 warnings of sounding a buzzer.

Description of drawings

Fig. 1 is that the utility model is arranged schematic diagram in the tennis court.

Fig. 2 is the utility model laser beam height placement schematic diagram.

Fig. 3 is a photoelectric circuit block diagram of the present utility model.

Fig. 4 is physical circuit figure of the present utility model.

The specific embodiment

With reference to Fig. 1, in tennis court 1, two groups of generating lasers 2 and laser pickoff 6 have been arranged.During use, generating laser 2 and laser pickoff 6 are placed on tennis court 1 3～5 meters distance outward, make laser beam 3 in distance away from 5 one tennis diameters of service line; The laser beam 4 and the service line outside are at same position.7 for receiving and modulate circuit, the optical signal that laser pickoff 6 receives changed, nursed one's health, by buzzer 8 output sound signals.

Fig. 2 is the utility model laser beam 3 height placement schematic diagrames, and laser beam 3 is arranged in overhead that 9 height is the position of a tennis radius.

With reference to Fig. 3, Fig. 4, reception and modulate circuit 7 are by photodiode 10, I/V change-over circuit 11 and voltage comparator circuit 12 are formed, the signal output part of photodiode 10 links to each other with the signal input part of I/V change-over circuit 11, the signal output part of I/V change-over circuit 11 links to each other with the signal input part of voltage comparator circuit 12, and the signal output part of voltage comparator circuit 12 links to each other with the signal input part of buzzer 8.

When photoelectric diode 10 has laser when irradiation, produce photoelectric current, convert current signal to voltage signal through I/V change-over circuit 11.For the voltage influence that veiling glares such as elimination visible light produce, the positive pole of amplifier is connected to reference voltage in the voltage comparator circuit 12, and negative pole connects the input voltage of level.Entire circuit is the output high level when the laser irradiation is arranged, in case laser is blocked by tennis, will produce low level immediately.

The utility model is as judge's instrument, but Effective Raise judge's accuracy is kept away Exempt from the misjudgement of fault when tennis, make in tennis, the judge really reaches To just, open, accurately. And the utlity model has rational in infrastructure, install simple, Advantage easy to use.

Claims (1)

1, tennis tournament fault siren, it is characterized in that, comprise two groups of generating lasers (2) and the laser pickoff of phase configuration (6) with it, laser pickoff (6) back configuration one receives and modulate circuit (7), reception and modulate circuit (7) are by photodiode (10), I/V change-over circuit (11) and voltage comparator circuit (12) are formed, the signal output part of photodiode (10) links to each other with the signal input part of I/V change-over circuit (11), the signal output part of I/V change-over circuit (11) links to each other with the signal input part of voltage comparator circuit (12), and the signal output part of voltage comparator circuit (12) links to each other with the signal input part of buzzer (8).

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