JPH0669721U - Ray detector - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a photodetector having a light receiving angle range of 180 ° or more. [Structure] Light receiving portions 4a are provided on both sides of a ridge 3b of a triangular prism-shaped corner of a body 3a.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a light beam detector used for horizontal level detection of a laser beam in leveling, for example.

[0002]

[Prior art]

 Conventionally, in leveling, as shown in FIG. 2, a light emitter 2 of a laser beam 1 is provided to rotate in a level plane at a center O, and this light beam is received by a light beam detector 3 installed in a measuring section. The level line or its height was detected. As shown in FIG. 3, the light beam detector 3 is provided with a light receiving element 4 and a display plate 5 for indicating up and down of the light receiving position on the plane of the rectangular parallelepiped at a position intersecting with the horizontal scale line 6, A scale or the like (not shown) was connected.

[0003]

[Problems to be solved by the device]

 However, in this case, since the light receiving angle range of the light beam detector 3 is 180 ° or less, for example, the light beam detector 3 is installed on the surface 11 of the fixed portion 10 forming a dead angle of 180 ° or more with respect to the light source shown in FIG. Then, the laser beam 1 could not be received. Therefore, in this case, the position of the light emitter 2 must be changed, but this is likely to cause an error.

[0004]

[Means for Solving the Problems]

 The present invention eliminates such drawbacks, and as shown in FIG. 1, light receiving portions 4a are provided on both sides of a ridge 3b of a triangular prism-shaped corner of the body 3a.

[0005]

[Action]

 Since the present invention has such a constitution, the light receiving angle range of the body 3a of the light beam detector is larger than 180 °, and therefore, as shown in FIG. 2, the dead angle of 180 ° or more is fixed to the light source. Even if it is attached to the surface 11 of the portion 10, the beam 1 of the light beam can be received.

[0006]

【Example】

 In FIG. 1, 5a is a display plate and 6 is a horizontal scale line, which are the same as the conventional ones. The power switch 7, the operation buttons 8 and 9, the bubble tube and the like are also the same as those of the conventional one.

The body 3a does not have to be a triangular prism as a whole, but a regular triangular prism is preferable when it is a triangular prism. In this case, the scales 12 and 13 are provided on the other edges 3c and 3d. The regular triangular prism shape enables measurement in the angular range of 300 °.

[0008]

[Effect of device]

 As described above, according to the present invention, since the light receiving angle range is larger than 180 °, the degree of freedom of the installation angle is increased and it is not necessary to change the position of the light emitter 2 even when installing at the dead angle. is there.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is a plan view showing a conventional state and a position state of the present invention.

FIG. 3 is a perspective view of a conventional device.

[Explanation of symbols]

 3a Body 3b Ridge 4a Light receiving part

Claims (1)

[Scope of utility model registration request] 1. A light ray detector comprising light-receiving portions provided on both sides of a ridge of a triangular prism-shaped corner of a body.