Laser beam projecting device
a laser beam and projector technology, applied in the direction of instruments, semiconductor lasers, optical elements, etc., can solve the problems of complex structure of optical systems, and achieve the effect of simplifying the structure and simplifying the structure of optical systems
Inactive Publication Date: 2006-05-04
KK TOPCON
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Benefits of technology
[0009] It is an object of the present invention to provide a laser beam projecting device, by which it is possible to shut off a return beam without separately providing a polarizing plate, and to simplify structure of the laser beam projecting device.
[0011] According to the present invention, there are provided a laser light source for emitting a laser beam, a wavelength selecting film for allowing the laser beam from the laser light source to pass, and a birefringent optical member arranged on an optical axis closer to an exit side than the wavelength selecting film, and the wavelength selecting film is tilted so that an incident angle of the laser beam is in a range of 45° to 80°. As a result, the wavelength selecting film has difference in transmission characteristics between the P-polarizing component and the S-polarizing component, and the wavelength selecting film fulfills a function as a polarizing plate. Thus, it is possible to shut off the return beam without providing a polarizing plate separately, and this makes it possible to design an optical system with simplified structure.
[0012] According to the present invention, the laser beam projecting device has an anamorphic prism, and the wavelength selecting film is formed on one surface of wedge-like prisms, which constitute the anamorphic prism. Thus, the return beam can be shut off without providing a polarizing plate separately, and this leads to the simplified structure of the optical system.
Problems solved by technology
This results in complicated structure of the optical system.
Method used
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[0020] Description will be given below on the best mode to carry out the present invention referring to the drawings.
[0021] First, referring to FIG. 1, description will be given on a basic arrangement of an optical system of a laser beam projecting device. In FIG. 1, the same component as shown in FIG. 7 is referred by the same symbol.
[0022] A laser beam 5 from a semiconductor laser 1 is shaped by the anamorphic prism 3 and the laser beam 5 is projected. A ¼λ plate 8 is provided on a projection optical axis 6 of the laser beam 5.
[0023] A wavelength selecting film 11 is formed on at least one surface of wedge-like prisms 4a and 4b, which constitute the anamorphic prism 3, e.g. on a surface facing to the semiconductor laser 1 of the wedge-like prism 4a. By forming the wavelength selecting film 11 on the surface which is tilted at an angle of 45° or more with respect to an incident axis of the laser beam, the wavelength selecting film 11 fulfills the function as a beam splitter.
[00...
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A laser beam projecting device, comprising a laser light source for emitting a laser beam, a wavelength selecting film for allowing the laser beam from the laser light source to pass, and a birefringent optical member arranged on an optical axis closer to an exit side than the wavelength selecting film, wherein the wavelength selecting film is tilted so that an incident angle of the laser beam is in a range of 45° to 80°.
Description
BACKGROUND OF THE INVENTION [0001] The present invention relates to a laser beam projecting device comprising structure for shutting off a return beam of a laser beam emitted from a laser light source. [0002] It is known that output of a laser light source for emitting a laser beam is decreased when there is a return beam, and a surveying system utilizing the laser beam has an arrangement to shut off the return beam. [0003]FIG. 7 shows general features of an optical system of a conventional type laser beam projecting device, which has an operation to shut off the return beam. [0004] In FIG. 7, reference numeral 1 denotes a semiconductor laser, and reference numeral 2 denotes a condenser lens. Reference numeral 3 denotes an anamorphic prism, which comprises two wedge-like prisms 4a and 4b having different collection angles in two directions of cross-section of luminous flux. After passing through the anamorphic prism 3, a laser beam 5 is projected on a projection optical axis 6. On t...
Claims
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Patent Timeline
Login to View More IPC IPC(8): H01S3/08
CPCG01C15/00G01S7/4811G02B26/108G02B27/0972H01S5/0071G02B19/0052G02B19/0014
Inventor SAITO, MICHIYOHAYASHI, KUNIHIRO
Owner KK TOPCON