Laser distance measuring device
The laser distance measuring device of the present invention comprises an emitting part having a laser generating device with a first spectral bandwidth arranged on an emitting optical path and a collimating lens. The emitting part also has an optical filter with a second spectral bandwidth which is less than the first spectral bandwidth. The laser distance measuring device also has a receiving part having a photoelectric receiving and conversion device to receive the measuring beam reflected by the object to be measured and convert it into an electric signal. Using the optical filter, most of the unneeded portions of the laser beam emitted from the laser are filtered out so that the useful proportion of the measuring beam of the laser beam is improved and the ranging capability of the laser distance measuring device under a bright or strong light environment is enhanced.
1. A laser distance measuring device, comprising:
an emitting part arranged on an emitting optical path that emits a measuring beam toward an object to be measured, comprising:
a laser generating device for emitting a laser beam having a first spectral bandwidth; and,
a collimating lens;
a receiving part arranged on a receiving optical path, said receiving part comprising:
a receiving object; and,
a photoelectric receiving and conversion device to receive the measuring beam reflected by the object to be measured and convert it into an electric signal;
wherein said emitting part further comprises a first optical filter having a second spectral bandwidth which is less than said first spectral bandwidth.
2. A laser distance measuring device as claimed in claim 1 , wherein the first optical filter is an optical narrow-band filter.
3. A laser distance measuring device as claimed in claim 1 , wherein the first optical filter is arranged between the laser generating device and the collimating lens.
4. A laser distance measuring device as claimed in claim 1 , wherein the first optical filter is encased within the laser generating device.
5. A laser distance measuring device as claimed in claim 1 , wherein the first optical filter is arranged on one side of the collimating lens which faces away from the laser generating device.
6. A laser distance measuring device as claimed in claim 1 , wherein the first optical filter is an optical film having a filtering function.
7. A laser distance measuring device as claimed in claim 6 , wherein the optical film is coated on at least one side of the collimating lens.
8. A laser distance measuring device as claimed in claim 1 , wherein the receiving part further comprises a second optical filter.
9. A laser distance measuring device as claimed in claim 8 , wherein the second optical filter and the first optical filter have similar filter characteristics.
10. A laser distance measuring device as claimed in claim 8 , wherein the second optical filter and the first optical filter have similar temperature drift characteristics.
11. A laser distance measuring device as claimed in claim 8 , wherein the second optical filter has a third spectral bandwidth which is less than said first spectral bandwidth.
12. A laser distance measuring device as claimed in claim 11 , wherein the third spectral bandwidth is less than or equal to the second spectral bandwidth.
13. A laser distance measuring device, comprising:
an emitting part arranged on an emitting optical path that emits a measuring beam toward an object to be measured, comprising:
a laser generating device for emitting a laser beam having a first spectral bandwidth; and,
a collimating lens;
a receiving part arranged on a receiving optical path, said receiving part comprising:
a receiving object; and,
a photoelectric receiving and conversion device to receive the measuring beam reflected by the object to be measured and convert it into an electric signal;
wherein said emitting part further comprises a first optical filter having a second spectral bandwidth which is less than said first spectral bandwidth and the receiving part further comprises a second optical filter.
14. A laser distance measuring device as claimed in claim 13 , wherein the second optical filter and the first optical filter have similar filter characteristics.
15. A laser distance measuring device as claimed in claim 13 , wherein the second optical filter and the first optical filter have similar temperature drift characteristics.
16. A laser distance measuring device as claimed in claim 13 , wherein the second optical filter has a third spectral bandwidth which is less than said first spectral bandwidth.
17. A laser distance measuring device as claimed in claim 16 , wherein the third spectral bandwidth is less than or equal to the second spectral bandwidth.