JP3679171B2 - Focusing plate adjustment device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a focusing screen adjusting device for a surveying instrument, and more particularly, to a focusing screen adjusting device for a surveying instrument that adjusts a focusing screen provided in a level machine, a distance measuring angulation instrument, and the like.
[0002]
[Prior art]
Conventionally, the focusing screen of the telescope has been adjusted by pushing and pulling screws provided in the four directions of the circumference of the focusing screen. However, there is an inconvenience that all four screws provided in the four directions around the focusing screen have to be moved. In addition, when the screw is tightened to fix the focusing screen in a predetermined position, the focusing screen inevitably moves. Therefore, adjustment must be made in view of that amount. Also, the inclination of the crosshair could not be adjusted.
[0003]
Therefore, a technique that can be adjusted with one screw has been proposed. For example, in Japanese Utility Model Laid-Open No. 61-24719, the loosely fitting portions of the adjusting screw and the mounting screw in the outer frame of the focusing screen are each formed in a long hole in the circumferential direction of the outer frame of the focusing screen, A technique is disclosed that includes a pulling mechanism for pulling to either the adjustment screw side or the mounting screw side.
[0004]
That is, according to this technique, the adjustment is made with a single screw, and “the rear end surface in the focusing screen outer frame (4) is brought into contact with the rear end in the focusing screen outer frame (4). A missing ring (6) is fixed in the vicinity, and a spring washer (7) is interposed between the rear end face of the focusing screen frame (3) and the front surface of the missing circle ring (6), thereby the focusing screen frame (3). Therefore, the focusing screen (1) is always formed so as to be pressed against the rear end surface of the projecting edge (5), that is, the front side of the focusing screen outer frame (4). Screw threading strips (8) and (9) that are long in the circumferential direction of the outer frame are provided at left and right symmetrical positions, and the threaded portion (10b) of the adjustment screw (10) is inserted into the threading strip strip (8). The screw portion (10b) is screwed into a screw hole (16) provided in the focusing screen frame (3), thus the head (10a) of the adjusting screw (10) and the focusing screen outer frame. 4) The curved washer (12a) is interposed between the outer surface of 4) and the threaded portion (11b) of the mounting screw (11) is inserted into the threaded through hole (9), and the threaded portion (11b) It is screwed into a screw hole (17) provided in the focusing screen frame (3), and the focusing screen frame (3) is supported by the mounting screw (11) and the previous adjustment screw (10). " The focusing screen frame (3) is always pulled by the pulling mechanism in the direction of the mounting screw (11) or the direction of the adjusting screw (10). " As described above, the elastic spring member (13) is interposed between the curved washer (12b) in contact with the outer surface of the focusing screen outer frame (4) and the head (11a) of the mounting screw (11). The mounting screw (11) is always elastically pulled outward, and thus the focusing screen frame (3) is elastically pulled toward the mounting screw (11) ". That (line 16 page 4 specification No. Sho 61-24719 to first row page 6).
[0005]
In addition to the above-mentioned Japanese Utility Model Publication No. 61-24719, Japanese Utility Model Publication No. 41-135 and the like are known as having screws with elastic means.
[0006]
Furthermore, Japanese Utility Model Laid-Open No. 54-118154 is known in addition to the above Japanese Utility Model Laid-Open No. 61-24719 as a device that can correct the inclination. In Japanese Utility Model Laid-Open No. 54-118154, “a first adjustment that adjusts the focal length (Z direction) of a holding plate fixed to the apparatus main body and an optical system such as a lens supported and mounted on the holding plate”. A mechanism, and a second adjustment mechanism that adjusts the reading element supported and mounted on the holding plate in the X direction, the Y direction, and the twist direction (Q direction) in a plane perpendicular to the Z direction, A technique is disclosed in which the position is adjusted in the X, Y, Z and Q directions via the first and second adjustment mechanisms mounted on the holding plate using the holding plate as a reference surface. That is, the Z-direction moving plate 16 is attached to the opposing surfaces of the holding plate 11 so as to be position adjustable with screws 27 at the four corners, and the Y-direction movement is performed by a differential screw 18 conventionally used for fine adjustment. . A pin 19 provided on the side of the Y-direction moving plate 16 facing the differential screw 18 is a guide pin that absorbs the movement by the differential screw 18. The differential screw 18 is formed by engraving one kind of screws L ₁ and L ₂ , and the Y-direction moving plate moves by Y = L ₁ −L ₂ by one rotation of the differential screw 18, and the lead L _1. And L ₂ can be made closer to _{each other} to make fine adjustment.
[0007]
The Y-direction moving plate is fitted to the Q-direction moving plate 23 on the side facing the holding plate 11 and covers the Y-direction moving plate 16 between the Q-direction moving plate 23 and the holding plate 11 in the X direction. The moving plate 17 and the X direction adjusting plate 20 are inserted. First, a substrate 24 that has determined the reading element 10 is integrally attached to the Q-direction moving plate 23 by means of fixed screws 26 and 26, and the other end of the Q-direction moving plate 23 is connected to the protrusion 16 a of the Y-direction moving plate 16. They are engaged and displaced as the Y-direction moving plate 16 moves. The Q-direction moving plate 23 is supported by the X-direction adjusting plate 20 and the X-direction moving plate 17 by the Q-direction adjusting screw 25, but the Q-direction moving plate 23 in the portion through which the adjusting screw 25 is inserted has a smaller diameter than the screw diameter. A sufficiently large hole 25a is formed, and the twist adjustment in the Q direction is executed by sliding the substrate 24 on the X direction adjusting plate 20 within the range of the hole 25a. The Q-direction adjusting screw 25 is fastened with the twist adjusted, and the position is fixed. However, the Q-direction adjusting screw 25 is fastened in a state where the position adjustment in the Y direction and the position adjustment in the X direction described below are performed, and is placed in a loosened state during the adjustment operation.
[0008]
The position adjustment in the X direction is performed by adjusting the X direction moving plate 17 in the X direction by the X direction moving plate 17 that covers the Y direction moving plate 16 and is interposed between the X direction moving plate 23 and the X direction moving plate 17. This is executed by the rotation of the moving screw 21. The guide pin 22 provided in the X direction of the X direction moving plate 17 absorbs the X direction movement by the differential screw 21. The differential screw 21 is formed of a screw having a different lead like the differential screw 18 and is finely adjusted. When the X-direction moving plate 17 is moved by the rotation of the differential screw 21, the Y-direction moving plate 16 in the fitted state is also moved integrally with the movement, and is further supported by the X-direction fine adjustment plate 20. The base 24 is also moved in the X direction to adjust the position. (The specification of Japanese Utility Model Laid-Open No. 54-118154, page 4, line 14 to page 6, line 19).
[0009]
[Problems to be solved by the invention]
However, in the technique disclosed in Japanese Utility Model Publication No. 61-24719, adjustment is performed by screwing an adjustment screw or mounting screw directly into a frame that holds the focusing screen. In order to adjust the head, the head (10a) of the adjusting screw (10) or the head (11a) of the mounting screw (11) is tapped with a mallet or the like.
[0010]
In addition, the technique disclosed in Japanese Utility Model Publication No. 54-118154 is not only complicated, but the adjustment mechanism by pushing and pulling the screws does not move all four screws provided in the four directions around the focusing screen. There was inconvenience that it should not take time and effort. Further, when the screw is tightened to fix the focusing screen at a predetermined position, the focusing screen inevitably moves, so that adjustment may be made in anticipation of the movement.
[0011]
SUMMARY OF THE INVENTION An object of the present invention is to provide a focusing screen adjusting device that can not only move the focusing screen left and right (up and down) with a single screw, but also tilt the focusing screen and make adjustments easily and quickly. Accordingly, another object of the present invention is to provide a focusing screen adjusting device capable of independently performing the operation of moving the focusing screen to the left and right and the operation of correcting the tilt.
[0012]
[Means for Solving the Problems]
A focusing screen adjusting device according to the present invention includes a focusing screen, a focusing screen placing portion that places the focusing screen in the center, and a connecting portion in which a long hole that is concentric with the center of the focusing screen is formed on both sides. The plate frame, a support portion that movably supports the focusing screen frame, and a frame body that is disposed on the outside diameter of the focusing screen placement portion, and has a V-shaped groove that is inclined outward from the center. A focusing plate frame presser for closing the focusing screen, a notch for exposing the focusing screen frame presser in the center, and a presser pin and spring assembled from one side toward the focusing screen frame presser and the other side A focusing screen outer frame having an adjustment screw incorporated from the above, and a screw for fixing the support portion and the connecting portion of the focusing screen frame, each of the presser pin of the focusing screen outer frame and the adjustment screw. With the tip abutting on the V-shaped groove, press the focusing screen frame presser from both sides. The focusing plate frame can be moved in a horizontal direction on a plane perpendicular to the collimating axis by the adjusting screw, and the focusing plate frame presser is collimated by rotating along the long hole of the focusing screen frame by adjusting the screw. It is characterized by being rotatable on a plane perpendicular to the axis.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
The telescope for surveying is connected to the objective lens and the focusing lens for focusing in perspective, the focusing knob for moving the objective lens in the lens barrel, the erecting prism for creating an upright image, and the focusing screen crosshair on the imaging surface. It consists of an eyepiece that magnifies the image. The focusing screen adjusting device of the present invention includes a focusing screen G, a focusing screen frame 1, a focusing screen frame presser 2, a focusing screen outer frame 3, a presser pin 4, a spring 5, an adjustment screw 6, and a screw 7. And the support part 8 is made into the main components.
[0014]
The focusing screen frame 1 is formed with a focusing screen G arranged at the center, and on both sides of the focusing screen frame 1 are formed connecting portions 1c that are concentric with the center of the focusing screen and have a long hole 1b in the circumferential direction. (Figure 3)
[0015]
In this focusing screen frame 1, the connecting portion 1 c and the support portion 8 are attached by screws 7. By loosening the screws 7, the focusing screen frame 1 is movable with respect to the support portion 8 in the range of the long hole 1 b. ing.
[0016]
Further, the focusing screen frame presser 2 is formed of a frame body disposed on the outer diameter of the focusing screen frame 1, and a V-shaped groove 2 a inclined outward from the center is formed at a predetermined position on the outer periphery. ing. The focusing screen G is closed by the focusing screen frame presser 2.
[0017]
The focusing screen outer frame 3 is formed with a notch 3a for exposing the focusing screen frame presser 2 in the center. The focusing screen outer frame 3 has a pressing pin 4 from one direction toward the focusing screen frame presser 2. And the spring 5 are arranged, and the adjusting screw 6 is arranged on the other side.
[0018]
The respective ends of the presser pin 4 and the adjustment screw 6 of the focusing screen outer frame 3 are in contact with the V-shaped groove 2 a, the focusing screen frame presser 2 is pressed from both sides, and the focusing plate frame 1 is adjusted by the adjustment screw 6. Can be moved in the horizontal direction on a plane perpendicular to the collimation axis, and the focal plate frame presser 2 is perpendicular to the collimation axis by rotating along the long hole 1b of the focal plate frame 1 by adjusting the screws 7. It can be rotated on the surface.
[0019]
Since the presser pin 4 and the adjustment screw 6 are in contact with the V-shaped groove 2a in this way, even if the center of the presser screw is displaced, the force can be applied uniformly toward the center of the focusing screen frame 1. it can.
[0020]
Therefore, the operation of moving the focusing screen G to the left and right and the operation of correcting the tilt can be performed independently. That is, first, the center of the focusing screen G (intersection of the crosshairs) and the collimation axis are aligned, and then the tilting of the focusing screen G can be corrected (the vertical line of the crosshairs becomes vertical), making adjustment easy. It can be done quickly.
[0021]
That is, the focusing screen frame 1 is incorporated in the focusing screen frame holder, and if the focusing screen frame holder is moved to the left and right (up and down), the focusing screen frame 1 also moves and the focusing screen can be adjusted to the left and right (up and down). Further, when the focusing screen frame 1 is rotated, the focusing screen frame presser acts as a guide rail, and the focusing screen G can be tilted without shaking up, down, left and right.
[0022]
In this way, the movement of the focusing screen G in the horizontal (left and right or up and down) direction can be performed by placing the spring 5 on one side and pushing and pulling it with a screw from the opposite side. Another frame is provided, and the focusing screen G can be rotated on a plane perpendicular to the collimation axis as a guide.
[0023]
As described above, according to the present invention, by turning one screw, the center of the crosshair can be adjusted to the intersection line between the plane perpendicular to the collimation axis 10 and the vertical plane including the collimation axis. Apart from the movement, the tilt of the focusing screen G can be adjusted. It is possible to rotate the focusing screen G on a plane perpendicular to the collimation axis and move it horizontally on the same plane.
[0024]
【Example】
Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. Note that the specific members, arrangements, and the like described below do not limit the present invention and can be variously modified within the scope of the gist of the present invention.
[0025]
1 to 3 show an embodiment of a focusing screen adjusting device according to the present invention, FIG. 1 is a partially cutaway front view of the focusing screen adjusting device, and FIG. 2 is a cross-sectional view taken along line AA in FIG. FIG. 3 and FIG. 3 are sectional views taken along line BB in FIG.
[0026]
The focusing screen G of this example is assembled to the focusing screen frame 1. Although not shown, the focusing screen G is provided with a cross hair or a stadia wire. The focusing screen frame 1 of this example is composed of a plate body having a substantially rectangular shape. A focusing screen G is formed at the center, and a long hole 1b in the circumferential direction is formed concentrically with the focusing screen center on both sides. The connection part 1c is provided. The focusing screen placing portion 1a is formed with a cylindrical body protruding upward, and the focusing screen G is placed on this cylindrical body. Further, a focusing screen frame presser 2 to be described later is fitted on the outer periphery of the focusing screen frame 1, and an arc-shaped step 1 d is formed on the top surface of the focusing screen 1.
[0027]
The focusing screen frame presser 2 of this example is made of a frame body arranged on the outer diameter of the focusing screen frame 1, and has a hole 2b at the center. Opposite V-shaped grooves 2 a are formed on the outer periphery of the focusing screen frame presser 2. The V-shaped groove 2a in this example is formed to be inclined outward from the center. The focusing screen G is closed by the focusing screen frame presser 2.
[0028]
The focusing screen outer frame 3 of this example is formed with a notch 3a for exposing the focusing screen frame presser 2 at the center. In addition, a through hole 3b that penetrates from the outer periphery of the focusing screen outer frame 3 to the notch 3a is formed. A screw hole 3d is formed on the through hole 3b on the side of the notch 3a, and an adjustment screw 6 is screwed into the screw hole 3d. A female screw portion 3e is formed on the outer peripheral side of the through hole 3c, and a presser pin 4, a spring 5 and a presser pin adjusting screw 9 are disposed in the through hole 3c.
[0029]
The presser pin 4 of this example has a tip formed as a contact part 4 a and is exposed in the notch part 3 a, and the contact part 4 a is in contact with the V-shaped groove 2 a of the focusing screen frame presser 2. A spring 5 is disposed between the rear end of the presser pin 4 and the adjusting screw 6. The presser pin adjusting screw 9 is screwed with the female screw portion 3e. In addition, although the spring 5 of this example uses the coil spring, a leaf | plate spring etc. may be sufficient.
[0030]
The adjustment screw 6 of this example has a contact portion 6a formed at the tip, the contact portion 6a is in contact with the V-shaped groove 2a of the focusing screen frame presser 2, and the adjustment screw 6 is rotated at the rear end. A groove 6b that engages with a jig for the purpose is formed. After adjusting the focusing screen G with the adjusting screw 6, the focusing screen outer frame 3 is fixed with the fixing screw 11.
[0031]
The screw 7 of this example fixes the support portion 8 and the connecting portion 1c of the focusing screen frame 1. By loosening this screw 7, the focusing screen frame 1 is a long hole formed in the connecting portion 1c. It can be rotated along a plane perpendicular to the collimation axis along 1b. 3, reference numeral 12 denotes a lens barrel, reference numeral 13 denotes a focusing knob, reference numeral 14 denotes an eyepiece, reference numeral 15 denotes a focusing lens, and reference numeral 16 denotes an erecting prism.
[0032]
Next, the operation of the focusing screen adjusting apparatus having the above configuration will be described.
First, when the adjusting screw 6 is turned, the adjusting screw 6 pushes the focusing screen frame presser 2, thereby compressing the spring 5 repelling the pressing pin 4 so that the focusing screen frame 1 and the focusing screen frame presser 2 are moved. It moves horizontally on a plane perpendicular to the collimation axis 10. Thereafter, the focusing screen outer frame 3 is fixed with fixing screws 11.
[0033]
Further, since the outer diameter of the focusing screen frame 1 and the inner diameter of the focusing screen frame presser 2 are fitted to each other, the focusing screen frame 1 becomes rotatable with respect to the focusing screen frame presser 2 by loosening the screws 7, so that the focus is increased. By rotating the plate frame 1 along the long hole 1b, the inclination of the crosshair can be adjusted regardless of the horizontal movement.
[0034]
【The invention's effect】
As described above, according to the present invention, by turning one adjusting screw, the center of the crosshair can be adjusted to the intersection line between the plane perpendicular to the collimation axis and the vertical plane including the collimation axis. By rotating the focusing screen frame presser separately from the movement, the tilt of the focusing screen can be adjusted and quick adjustment is possible.
[Brief description of the drawings]
FIG. 1 is a partially cutaway front view of a focusing screen adjusting apparatus according to the present invention.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
FIG. 3 is a cross-sectional view taken along line BB in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Focus plate frame 1a Focus plate arrangement | positioning part 1b Long hole 1c Connection part 1d Level | step difference 2 Focus plate frame press 2a V-shaped groove 2b Hole 3 Focus plate outer frame 3a Notch part 3b, 3c Through-hole 3d Screw hole 3e Female screw part 4 Press Pin 4a Contact part 5 Spring 6 Adjustment screw 6a Contact part 6b Groove 7 Screw 8 Support part 9 Cap screw 9
12 barrel 13 focusing knob 14 eyepiece 15 focusing lens 16 erecting prism G focusing plate

Claims (1)

A focusing screen frame having a focusing screen, a focusing screen positioning portion for positioning the focusing screen in the center, and a connecting portion in which a long hole along the circumference concentric with the focusing screen center is formed on both sides, and the focusing screen frame is movable. And a focusing screen that closes the focusing screen and has a V-shaped groove that is opposed to the center and has a V-shaped groove that is inclined outward from the center. A focus having a frame presser, a notch for exposing the focusing screen frame presser at the center, a presser pin and spring assembled from one side toward the focusing screen frame presser, and an adjusting screw assembled from the other side A plate outer frame, and a screw for fixing the support portion and the connecting portion of the focusing screen frame, and the respective tips of the pressing pin of the focusing screen outer frame and the adjusting screw are brought into contact with the V-shaped groove. Press the focusing screen frame presser from both sides and view the focusing screen frame with the adjustment screw. It is possible to move in a horizontal direction on a plane perpendicular to the axis, and the focal plate frame presser can be rotated on a plane perpendicular to the collimating axis by rotating along the long hole of the focal plate frame by adjusting the screw. A focusing screen adjusting device.

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