JP2006171562A - Optical axis adjusting mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical axis adjusting mechanism for an optical apparatus, where the optical axis adjusting mechanism is designed such that fine adjustment is easy, the adjustment shift is less likely to occur after adjustment, displacement of the optical axis, resulting from being subjected to temperature cycling at high temperature and low temperature, is reduced. <P>SOLUTION: The optical axis adjusting mechanism for the optical apparatus capable of adjusting the angle of a mirror (22) includes a rotating plate (36) having a wedge-shaped section and used to fix the mirror; an optical axis adjusting mechanism housing (20) that slides against the rotary plate; and a fixing screw (34), used to fix the rotary plate to the optical axis adjusting mechanism housing. The circumferential face of the rotating plate has a pin insertion hole (32), into which an adjustment pin (30) is inserted. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an optical axis adjustment mechanism of an optical instrument, and more particularly, in a surveying instrument such as a lightwave distance meter, so that the light reflected by the mirror can be accurately parallel to the optical axis of the telescope of the surveying instrument. The present invention relates to an optical axis adjustment mechanism that can adjust the angle of the light.

  As an optical axis adjusting mechanism of an optical device, one disclosed in Patent Document 1 below is known. This optical axis adjusting mechanism is shown in FIG.

This optical axis adjustment mechanism reflects a light beam along the optical axis L1 of the first lens 1 with a reflecting mirror (mirror) 7 so as to coincide with the optical axis L2 of the second lens 2. The correction member 4 for fixing the reflecting mirror 7 at one end has a spherical end at the other end, and the other end is spherically fitted to a spherical seat 3 provided in the apparatus main body 10. It can be adjusted freely. The correction member 4 is fixed to the apparatus main body 10 with screws (screws) 5 and 6 after adjusting the angle of the reflecting mirror 7. Thereby, the light beam along the optical axis L1 of the first lens 1 can be reflected by the reflecting mirror 7 to coincide with the optical axis L2 of the second lens.
JP 58-106505 A

  In the optical axis adjustment mechanism disclosed in Patent Document 1, since there is no mechanism for slowly changing the angle of the correction member 4, that is, the reflecting mirror 7, fine adjustment is difficult. Since the frictional force due to the spherical fitting between them is small, the angle of the correction member 4 is easily changed when the screws 5 and 6 are tightened after adjustment. Further, when a high temperature and low temperature cycle are given, the screws 5 and 6 are thermally expanded. There was a problem that the angle of the correction member 4 was easily changed due to expansion and contraction, and the reproducibility of matching both optical axes L1 and L2 when returning to the original temperature was poor.

  The present invention has been made in view of the above problems, and in an optical axis adjustment mechanism of an optical instrument, fine adjustment is easy, adjustment deviation hardly occurs after adjustment, and after a high temperature and a low temperature cycle are given. The problem is to reduce the optical axis deviation.

  In order to solve the above-mentioned problems, an invention according to claim 1 is directed to an optical axis adjustment mechanism of an optical device capable of adjusting the angle of a mirror, and a rotary plate that fixes the mirror and has a wedge shape in cross section, An optical axis adjustment mechanism housing in contact with the optical axis adjustment mechanism housing and a fixing screw for fixing the rotating plate to the optical axis adjustment mechanism housing are provided.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, an adjustment pin insertion hole is formed in the peripheral surface of the rotating plate.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the taper angle of the rotating plate is approximately 1 to 5 °.

  According to the optical distance meter of the invention according to claim 1, in the optical axis adjustment mechanism of the optical device capable of adjusting the angle of the mirror, the rotary plate having a wedge-shaped cross section is fixed while the mirror is fixed, and is in sliding contact with the rotary plate. Since the optical axis adjusting mechanism housing and the fixing screw for fixing the rotating plate to the optical axis adjusting mechanism housing are provided, when the rotating plate is rotated, the angle of the mirror becomes slow due to the taper angle of the rotating plate. In other words, the optical axis adjustment of the optical device becomes extremely easy. In addition, a sufficient frictional force acts between the rotating plate and the optical axis adjusting mechanism housing, and the rotating plate is difficult to rotate, so that the optical axis can be less misaligned. Further, since the rotation center of the rotating plate is fixed by the fixing screw, the screw fixing distortion can be uniformly distributed, and the optical axis deviation after applying the high temperature and low temperature cycles can be reduced.

  According to the optical distance meter of the invention according to claim 2, since the adjustment pin insertion hole is formed in the peripheral surface of the rotation plate, the adjustment plate can be inserted into the adjustment pin insertion hole to rotate the rotation plate. However, after the adjustment, the rotating plate does not rotate due to the frictional force between the optical axis adjusting mechanism housing and the rotating plate, and the adjustment deviation of the optical axis hardly occurs.

  According to the optical distance meter of the invention according to claim 3, since the taper angle of the rotating plate is approximately 1 to 5 °, when the rotating plate is rotated, the angle of the mirror changes with an appropriate displacement, and The optical axis adjustment becomes extremely easy.

  Hereinafter, an embodiment of an optical axis adjusting device of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of the optical axis adjusting device. 2 is a cross-sectional view taken along line II-II in FIG. FIG. 3 is a diagram for explaining an adjustment method of the optical axis adjustment device.

  This optical axis adjustment mechanism converts the ranging light L emitted from the light source by 90 ° in a surveying instrument such as a light wave rangefinder, and the angle of attachment of the mirror 22 to the optical axis adjustment mechanism housing 20 with respect to the biaxial direction. This facilitates fine adjustment.

  The optical axis adjusting mechanism housing 20 includes a mirror housing portion 24 provided with a 45 ° inclined surface 24a for housing the mirror 22 therein, and ear portions 26 provided at both ends of the mirror housing portion 24. A long hole 28 is formed in the. The optical axis adjusting mechanism housing 20 is fixed to a surveying instrument main body (not shown) by a screw 47 passed through the long hole 28.

  In order to fix the mirror 22 to the mirror accommodating portion 24, the rotating plate 36 tapered in a wedge shape is accommodated in sliding contact with the inclined surface 24a, and the fixing screw 34 is moved from the outside to the inside of the inclined surface 24a via the washer 48. The rotation plate 36 is screwed into the rotation center screw 49 of the rotating plate 36 to fix the rotating plate 36 to the mirror accommodating portion 24, and the mirror 22 is fixed to the rotating plate 36 by bonding or the like. The taper angle α in the cross section of the rotating plate 36 is about 1 to 5 °, and particularly about 3 ° is optimal.

  On the mirror side of the rotating plate 36, a recess 46 is provided near the tip of the fixing screw 34 penetrating the rotating plate 36 to avoid distortion of the rotating plate 36.

  When the fixing plate 34 is tightened between the inclined surface 24a of the mirror housing portion 24 and the rotating plate 36, the rotating plate 36 is moved when the adjusting pin 30 is inserted into the pin insertion hole 32 of the rotating plate 36 and rotated. Although it is rotated, even if it tries to rotate the rotating plate 36 with a fingertip, a frictional force that does not rotate is applied. Thus, in order to make the frictional force between the inclined surface 24 a and the rotating plate 36 appropriate, anodized aluminum is suitable for the material of the mirror housing portion and the rotating plate 36, and the inclined surface of the rotating plate 36 is inclined. A recess 44 is provided on the surface 24a side, and the contact area between the two is set appropriately.

  Further, the mirror housing portion 24 is provided with a window 38, and a part of the rotating plate 36 is exposed from the window 38. Pin insertion holes 32 are provided in the side surface 40 of the rotation plate 36 at predetermined intervals, and the adjustment pin 30 is inserted into the pin insertion hole 32 so that the rotation plate 36 can be rotated together with the fixing screw 34. It has become.

  FIG. 4 shows an example in which this optical axis adjusting mechanism is provided in the optical path of a surveying instrument such as a lightwave distance meter. When the optical axis adjustment mechanism of this embodiment is used in an optical system of a surveying instrument (especially a light wave distance meter or a total station), the optical axis adjustment mechanism can be quickly and surely adjusted as compared with the adjustment mechanism of the conventional reflecting mirror 7 shown in FIG. Therefore, the cost of the surveying instrument can be reduced. FIG. 4 is an optical path diagram of the optical distance meter, and the telescope 70 is a collimating telescope (objective lens 54, focusing lens 59, focusing plate 60, eyepiece lens 61), and distance measuring transmission light for measuring the distance. The optical system (the light source 51, the collimator lens 52, and the mirror 22, the mirror 55, the objective lens 54, the beam splitter 56, the mirror 57, and the light receiving element 58 provided with the optical axis adjustment mechanism of this embodiment) is used to measure the distance. Is. The transmitted light L from the light source 51 is bent at a right angle by the mirror 22 and the mirror 55 and needs to coincide with the optical axis (collimation axis) C of the telescope 70. In this embodiment, the optical axis adjustment mechanism is The transmitted light L and the optical axis C can be easily matched by adjusting the provided mirror 22.

  In order to adjust the mirror 22 of the surveying instrument configured as described above, a collimator (not shown) is accurately installed on the optical axis C of the telescope 70 of the surveying instrument, and the ranging light L is emitted from the surveying instrument. Observe at. First, the collimator and the telescope 70 are made to face each other, and the optical axis of the collimator (the center 52 of the crosshair 50) and the optical axis C of the telescope (the crosshair of the focusing plate 60 of the collimating telescope) are set to the horizontal and altitude angles of the surveying instrument. Match by fine motion device. At first, since there is an attachment angle error in the mirror 22, as shown in FIG. 3, the bright spot P is seen at the P1 position deviated from the center 50c of the cross line 50 in the collimator visual field 50V. Therefore, when the adjustment pin 30 is inserted into the pin insertion hole 32 and the rotating plate 36 is rotated, the angle of the mirror 22 changes due to the taper angle α of the rotating plate 36, and the bright spot P moves in an oblique direction. To go. When the bright spot P coincides with the vertical line or horizontal line of the crosshair 50 of the collimator, the rotating plate 36 is stopped. At this time, since the taper angle α is small, the bright spot P moves slowly even if the rotating plate 36 is rotated greatly, and thus the adjustment so far is very easy.

  Next, the screw 47 for fixing the optical axis adjusting mechanism housing 20 to the surveying instrument main body is loosened and translated along the long hole 28. Then, the bright spot P moves along the vertical line or horizontal line of the cross line 50 depending on the direction of the long hole 28, so that the bright spot P coincides with the center 50 c of the cross line 50 and the screw 47 is tightened again. When the bright spot P is moved along the cross line 50, the optical axis adjusting mechanism housing 20 is guided by the screw 47 inserted through the long hole 28, and this adjustment is very easy.

  Thus, the optical axis C of the telescope 70 of the surveying instrument coincides with the optical axis of the distance measuring and transmitting optical system, and the distance measuring light L emitted from the light source 51 is transmitted in accordance with the optical axis C of the telescope 70. The

  According to the present embodiment, since the optical axis C of the telescope 70 of the surveying instrument and the optical axis of the distance measuring optical system can be easily matched, distance measurement with little error is possible. In general, when the optical axis C of the telescope 70 and the optical axis of the distance measuring light transmission optical system are deviated from each other, the error when the reflection sheet is set at the measuring point is larger than that of the prism. Since it is easy to adjust the optical axis, the distance measurement error can be reduced even if an inexpensive reflective sheet is used, which is economical.

  Also, by using the adjustment pin 30, the optical axis can be easily adjusted against the frictional force between the rotating plate 36 and the inclined surface 24a of the optical axis adjusting mechanism housing 20, but after the adjustment, the inclined surface Since the frictional force between 24a and the rotating plate 36 has an appropriate magnitude, it is difficult for misalignment to occur.

  Further, when the rotating plate 36 is fixed to the inclined surface 24a of the optical axis adjusting mechanism housing 20 with the fixing screw 34, the fixing screw 34 is arranged at the rotation center of the rotating plate 36, so that the screw fixing distortion is uniformly distributed. Therefore, it is possible to reduce the deviation of the optical axis after applying a high temperature and low temperature cycle.

  INDUSTRIAL APPLICABILITY The present invention can be widely used not only for a light wave distance meter but also for a surveying instrument incorporating a light wave distance meter, for example, a total station or other distance measuring devices, or when adjusting optical axes that intersect each other in an optical device.

It is a perspective view of the optical axis adjustment mechanism which concerns on one Example of this invention. It is sectional drawing which follows the II-II line | wire in FIG. It is a figure explaining the method of performing an optical axis adjustment with the said optical axis adjustment mechanism. It is an optical path diagram of a surveying instrument provided with the optical axis adjustment mechanism. It is a longitudinal cross-sectional view of the conventional optical axis adjustment mechanism.

Explanation of symbols

20 Optical axis adjustment mechanism housing 22 Mirror 30 Adjustment pin 34 Fixing screw 36 Rotating plate 40 Circumferential surface 42 Pin insertion hole α Taper angle

Claims (3)

In the optical axis adjustment mechanism of the optical equipment that can adjust the angle of the mirror,
A rotating plate having a wedge-shaped cross section that fixes the mirror, an optical axis adjusting mechanism housing that is in sliding contact with the rotating plate, and a fixing screw that fixes the rotating plate to the optical axis adjusting mechanism housing. An optical axis adjustment mechanism.   2. The optical axis adjustment mechanism according to claim 1, wherein an adjustment pin insertion hole is formed on a peripheral surface of the rotating plate.   The optical axis adjusting mechanism according to claim 1, wherein a taper angle of the rotating plate is approximately 1 to 5 °.

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