Method for operating an optoelectronic proximity sensor and optoelectronic proximity sensor

1. A method of operating an optoelectronic proximity sensor comprising a radiation-emitting component, a radiation-detecting component and a control unit, the method comprising:

operating the radiation-emitting component with a pulsed current during a measurement period, wherein

the pulsed current of the radiation-emitting component has an on time of a predetermined duration and an off time during the measurement period, and

causing the control unit to evaluate a proximity detection signal of the radiation-detecting component indicating proximity during the on time and ending the on time even if before expiration of the predetermined duration, if the proximity detection signal exceeds a threshold value, wherein

the ratio of the on time to the measurement period is less than 1/10.

2. The method according to claim 1 , wherein the pulsed current of the radiation-emitting component has a predefined maximum on time during a measurement period if the proximity detection signal does not exceed the threshold value.

3. The method according to claim 2 , wherein the maximum on time (t on ) is 1 μs to 100 ms.

4. The method according to claim 1 , wherein the on time is reduced by at least a factor of 10 in the case of a maximum proximity detection signal.

5. The method according to claim 4 , wherein the on time is reduced by at least a factor of 100 in the case of a maximum proximity detection signal.

6. The method according to claim 1 , wherein the measurement period is 1 ms to 2000 ms.

7. The method according to claim 1 , wherein the pulsed current of the radiation-emitting component has a pulse sequence during the on time of a measurement period, and a period of the pulse sequence is less than the on time by at least a factor of 10.

8. An optoelectronic proximity sensor comprising a radiation-emitting component, a radiation-detecting component and a control unit wherein the control unit

operates the radiation-emitting component with a pulsed current during a measurement period, the pulsed current has an on time of a predetermined duration and an off time during the measurement period, and a ratio of the on time to the measurement period is less than 1/10, and

evaluates a proximity detection signal of the radiation-detecting component indicating proximity during the on time and to end the on time even if before expiration of the predetermined duration, if the proximity detection signal exceeds a threshold value.

9. The optoelectronic proximity sensor according to claim 8 , wherein the pulsed current of the radiation-emitting component has a predefined maximum on time during a measurement period if the proximity detection signal does not exceed the threshold value.

10. The optoelectronic proximity sensor according to claim 9 , wherein the maximum on time is 1 μs to 100 ms.

11. The optoelectronic proximity sensor according to claim 8 , wherein the on time is reduced by at least a factor of 10 in the case of a maximum proximity detection signal.

12. The optoelectronic proximity sensor according to claim 11 , wherein the on time is reduced by at least a factor of 100 in the case of a maximum proximity detection signal.

13. An electronic apparatus comprising an optoelectronic proximity sensor according to claim 8 .

14. The electronic apparatus according to claim 13 , further comprising a touch-sensitive input and display device.

15. The electronic apparatus according to claim 13 , which is a cellular phone, a tablet PC or a navigation apparatus.