Point radiation street scene building sketching contour auxiliary drawing positioning amplifier

Abstract

The invention discloses a point radiation street scene building sketching outline auxiliary drawing positioning amplifier which mainly comprises a drawing board, a view finding plane lens, a lens vertical frame, a rotating rod and a sliding pen, the view finding plane lens is installed on the lens vertical frame, and the drawing board and the view finding plane lens are provided with the corresponding rotating rod and the sliding pen respectively; the sliding pen is slidably arranged on the rotating rod, the lower end of the rotating rod is connected to the lower edges of the drawing board and the framing plane lens through a rotating shaft, and the upper end of the rotating rod is installed on the drawing board and the framing plane lens through the rotating rod fixing clamp. Wherein the view-finding plane lens can enable a drawing object to be presented in a plane mode, and does not need to be refracted through a refractor and then to be subjected to reverse processing like a previous patent, so that drawing becomes more direct, the effect of the drawing is also easy to contrast with a real scene, and modification and processing of pictures are more facilitated. In a word, the point radiation street scene building sketching outline auxiliary drawing positioning amplifier is reasonable in structure, convenient to use and more beneficial to wide application and popularization.

Description

Technical Field

[0001] This invention belongs to the field of drawing tool technology, and particularly relates to a point-radial street scene building sketching outline auxiliary drawing positioning amplifier. Background Technology

[0002] The applicant's prior patent, "Point Radial Contour Drawing Mirror Positioning Amplifier" (Patent No. 2016103576178, Publication Date 2016.08.03), mainly includes a tripod supporting the drawing board, the drawing board, a mirror fixed to the drawing board, a triangular magnifying ruler clamping the mirror and the drawing board, and a stop device. This invention, by setting a fixed device on the triangular magnifying ruler, allows the artist to draw directly by simply flipping the drawing board or walking to the drawing paper, avoiding measurement errors caused by flipping and moving the magnifying triangle, thus improving the accuracy of drawing the magnified contour and saving drawing time. Furthermore, by marking and limiting the distance between the artist and the drawing board, and by using the stop device, especially the setting of the radial points, the artist's viewpoint and viewing distance remain relatively fixed, ensuring the stability of the magnified image.

[0003] Nevertheless, the product still has the following problems:

[0004] First, due to the large number of parts, it is easy to jam or become inflexible during assembly or use. On the other hand, it is not convenient to use and operate, and it is cumbersome to carry and install, which also affects the stability of the product.

[0005] Secondly, since the drawing paper is placed on the back of the drawing board, which is a refracting mirror, after measuring and magnifying the enlarged line segment using a rectangular ring ruler and a long ruler, the drawing board needs to be flipped to face the artist via a pivot. To address this, the inventor designed a complementary "dot-radial contour drawing mirror positioning amplifier with sliding square tube pen" (patent number 2019206009811, announcement date 2020.06.19). This allows for both simulating and drawing the enlarged contour line segment on the mirror side and simultaneously drawing the enlarged contour line segment on the back drawing board, making it more convenient. However, because the sliding square tube pen is located on the connecting circular rod of the back drawing board, which is a refracting mirror, the drawing effect cannot be directly seen during drawing, making the artist feel uncertain and difficult to correct errors.

[0006] Furthermore, because the front reflector often requires the reflector surface to tilt backward to a certain extent when refracting objects, the ruler, sliding square brush, and drawing paper, which are connected parallel to the front reflector on the back, tilt backward together with the drawing board surface. The center of gravity is reversed, making it feel unstable and not in accordance with convention.

[0007] Finally, although using a refracting mirror to refract objects produces stable images with clear outlines and well-defined positions, when drawing objects using a front refracting mirror, the artist needs to shift their body in front of the mirror to avoid obstructing the refraction. However, the parts of the body that cannot be shifted often end up reflected in the mirror, ruining the image effect. Furthermore, the body shifting off the canvas also appears uncoordinated. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a point-radial street scene building sketch outline auxiliary drawing positioning amplifier with reasonable structure and convenient use.

[0009] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0010] This point-and-shoot street scene building sketching outline auxiliary drawing positioning amplifier mainly includes a drawing board, a viewfinder plane lens, a lens stand, a rotating rod, and a sliding pen. The viewfinder plane lens is mounted on the lens stand, and the drawing board and the viewfinder plane lens are respectively equipped with corresponding rotating rods and sliding pens. The sliding pen is slidably mounted on the rotating rod. The lower end of the rotating rod is connected to the lower edge of the drawing board and the viewfinder plane lens through a rotating shaft, and the upper end of the rotating rod is mounted on the drawing board and the viewfinder plane lens (such as the upper edge) through a rotating rod fixing clip.

[0011] The drawing board and the viewfinder plane lens are similar rectangles with the same length and width ratio, and the size of the drawing board is not smaller than that of the viewfinder plane lens.

[0012] The lens stand includes a front support rod and a rear support rod. The top of the rear support rod is hinged to the upper part of the front support rod. The upper middle part of the front support rod and the upper middle part of the rear support rod are connected by a lower connecting adjustment rod. A triangular support plate is set at the lower part of the front support rod. The lower connecting adjustment rod consists of two parallel rods with sliding slot holes on them. One end of the lower connecting adjustment rod is rotatably connected to the upper middle part of the front support rod. An adjustment screw is set at the upper middle part of the rear support rod, and the adjustment screw is slidably connected in the sliding slot holes of the two parallel rods. Folding hinges are set in the middle of the front and rear support rods.

[0013] The upper and lower edges of the viewfinder plane lens are mounted on the front support rod of the lens holder via lens fixing components. The lens fixing components include a lower fixing component and an upper fixing component. The lower fixing component is a lens support plate, which is mounted on the front support rod, and the lower edge of the viewfinder plane lens is supported by the lens support plate bracket. The upper fixing component mainly consists of a lens clamp, a support rod sleeve, and an upper connecting adjustment rod. The lens clamp has a snap-fit ​​groove and a connecting handle, and the support rod sleeve has a sleeve ring and a sliding handle. The upper connecting adjustment rod consists of two parallel rods, each with a sliding strip hole. The snap-fit ​​groove snaps into the upper edge of the viewfinder plane lens, and the sleeve ring is fitted onto the upper part of the front support rod. One end of the upper connecting adjustment rod is rotatably connected to the connecting handle, and the upper part of the front support rod passes between the two parallel rods. An adjustment screw is provided on the sliding handle, and the adjustment screw is slidably connected in the sliding strip hole of the two parallel rods.

[0014] The sliding pen includes a sliding block and a positioning pen. The positioning pen is fixed on the sliding block, and the tip of the positioning pen protrudes out of the outside of the sliding block. The sliding block has a sliding channel and a fixing screw hole. The sliding block is slidably sleeved on the rotating rod through the sliding channel, and the fixing screw is positioned on the rotating rod through the fixing screw hole.

[0015] The lower edge of the drawing board and the viewfinder plane lens has a pivot hole. The lower end of the pivot is rotatably connected to the pivot hole, and the upper end of the pivot is fixedly connected to a rotating block. The rotating block has a through hole for a rotating rod parallel to the drawing board and the viewfinder plane lens. The lower end of the rotating rod is connected to the rotating block through the through hole.

[0016] The vertical distance between the center of the pivot hole and the rotating rod is equal to the vertical distance between the tip of the positioning pen and the rotating rod.

[0017] A pivot fixing plate is provided at the center of the lower edge of the drawing board and the viewfinder plane lens. The pivot fixing plate has a pivot hole, and a protruding insert is provided below the pivot hole.

[0018] The aforementioned point-radial street scene building sketch outline auxiliary drawing positioning amplifier also includes an iso-angle rotation conversion mold, which mainly consists of a cylinder, an extension plate, and a mold; the cylinder has a groove that matches the insert block, and the extension plate is vertically set on the outside of the cylinder; the mold includes a rotating circular piece, and a pair of external locking blocks are symmetrically and parallelly arranged on both sides of the center of the rotating circular piece; the rotating circular piece is rotatably connected to the extension plate by a rotating positioning screw at the center.

[0019] A pair of inner connecting blocks are symmetrically and parallelly arranged on both sides of the center of the rotating block where it connects to the rotating shaft; the equal angle rotation conversion mold is inserted into the insert block through the insert cylinder, and the outer connecting block of the insert mold is inserted into the outer connecting block of the rotating block through the outer connecting block of the insert mold.

[0020] To address the problems of the prior patent "Point-Radial Contour Drawing Mirror Positioning Amplifier," the inventors designed a point-radial street scene architectural sketching contour auxiliary drawing positioning amplifier. This amplifier mainly includes a drawing board, a viewfinder plane lens, a lens stand, a rotating rod, and a sliding pen. The viewfinder plane lens is mounted on the lens stand, and the drawing board and viewfinder plane lens are respectively equipped with corresponding rotating rods and sliding pens. The sliding pen is slidably mounted on the rotating rod, the lower end of which is connected to the lower edges of the drawing board and viewfinder plane lens via a pivot, and the upper end of which is fixed to the drawing board and viewfinder plane lens via a rotating rod clamp. The viewfinder plane lens allows the drawn object to be presented in a planar manner, eliminating the need for refraction and mirroring as in the prior patent. This makes drawing more direct, and the effect is easier to compare with the real scene, facilitating modification and processing. Furthermore, by setting separate tools for framing and drawing (viewfinder plane lens and drawing board), and using the corresponding rotating rod and sliding pen, both framing and proportional drawing can be achieved. In addition, by adding an equal-angle rotation conversion module, the drawing accuracy can be further improved. In summary, compared with the prior art, the point-radial street scene building sketch outline auxiliary drawing positioning amplifier of the present invention has a reasonable structure, is easy to use, and is more conducive to widespread application. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the viewfinder lens (excluding the rotating rod and sliding pen) in the point-radial street scene building outline auxiliary drawing positioning amplifier of the present invention.

[0022] Figure 2 This is a schematic diagram of the assembly process of the viewfinder plane lens part in the point-radial street scene building outline auxiliary drawing positioning amplifier of the present invention.

[0023] Figure 3 This is a schematic diagram of the drawing board portion in the point-radial street scene building outline auxiliary drawing positioning amplifier of the present invention.

[0024] Figure 4 This is a schematic diagram of the components and assembly structure of the fixed part on the viewfinder lens in the point-radial street scene building outline sketching auxiliary drawing positioning amplifier of the present invention. In the figure: a. lens clip, b. support rod sleeve, c. upper connecting adjustment rod, d. upper fixed part assembly diagram.

[0025] Figure 5 This is a schematic diagram of the components and assembly structure of the equal-angle rotation conversion mold of the point-radial street scene building sketch outline auxiliary drawing positioning amplifier of the present invention. In the figure: a. rotating circular plate, b. insert and extension plate, c. equal-angle rotation conversion mold.

[0026] Figure 6 This is a partial structural schematic diagram of the rotating shaft and rotating block in the positioning amplifier for the auxiliary drawing of street scene building outlines in this invention.

[0027] Figure 7 This is a schematic diagram of the structure of the rotating shaft fixing plate in the positioning amplifier for the auxiliary drawing of street scene building outlines in this invention.

[0028] Figure 8 This is a schematic diagram of the rotating rod fixing clamp in the point-radial street scene building outline auxiliary drawing positioning amplifier of the present invention. In the figure: a) rotating rod fixing clamp, b) fixing screw.

[0029] Figure 9 This is a schematic diagram of the sliding pen structure in the point-radial street scene building outline auxiliary drawing positioning amplifier of the present invention. In the figure: a) sliding pen, b) fixing screw.

[0030] In the diagram: 1. Drawing board, 2. Viewfinder plane lens, 3. Rotating rod, 4. Sliding pen, 5. Rotating shaft, 6. Rotating rod fixing clip, 7. Front support rod, 8. Rear support rod, 9. Lower connecting adjustment rod, 10. Triangular support plate, 11. Sliding strip hole, 12. Adjusting screw, 13. Lens support plate, 14. Lens clip, 15. Support rod sleeve, 16. Upper connecting adjustment rod, 17. Snap-fit ​​groove, 18. Connecting handle, 19. Socket ring, 20. Sliding handle, 21. Parallel rod, 22. Sliding block, 23. Positioning pen, 24. Sliding channel, 25. Fixing screw hole, 26. Fixing screw, 27. Rotating block, 28. Rotating rod through hole, 29. Rotating shaft fixing plate, 30. Rotating shaft hole, 31. Insert block, 32. Extension plate, 33. Rotating circular piece, 34. External locking block, 35. Rotating positioning screw, 36. Internal locking block, 37. Insert cylinder. Detailed Implementation

[0031] I. Basic Structure

[0032] like Figures 1 to 9 As shown, the point-radial street scene building sketching outline auxiliary drawing positioning amplifier of the present invention mainly includes a drawing board 1, a viewing plane lens 2, a lens stand, a rotating rod 3, and a sliding pen 4. The viewing plane lens is mounted on the lens stand, and the drawing board and the viewing plane lens are respectively provided with corresponding rotating rods and sliding pens; the sliding pen is slidably mounted on the rotating rod, the lower end of the rotating rod is connected to the lower edge of the drawing board and the viewing plane lens through a rotating shaft 5, and the upper end of the rotating rod is mounted on the upper edge of the drawing board and the viewing plane lens through a rotating rod fixing clip 6 (U-shaped clip, one side of the U-shaped clip has a rotating rod through hole). Wherein,

[0033] The drawing board and the viewfinder are similar rectangles with the same length and width ratio, and the size of the drawing board is no smaller than that of the viewfinder. The viewfinder is used for framing the shot, and the artist holds the drawing board to refer to the framing result when drawing the street scene (buildings).

[0034] The lens stand includes a front support rod 7 and a rear support rod 8. The top of the rear support rod is hinged to the upper part of the front support rod. The upper middle part of the front support rod and the upper middle part of the rear support rod are connected by a lower connecting adjustment rod 9. A triangular support plate 10 is provided at the lower part of the front support rod for balancing the stand. The lower connecting adjustment rod consists of two parallel rods 21, with sliding slots 11 on the parallel rods. One end of the lower connecting adjustment rod is rotatably connected to the upper middle part of the front support rod. An adjustment screw 12 is provided at the upper middle part of the rear support rod, and the adjustment screw is slidably connected in the sliding slots of the two parallel rods. Folding hinges can be provided in the middle of the front and rear support rods for easy storage and carrying after use. By adjusting the lower connecting adjustment rod, the height and tilt of the viewfinder lens (the angle change between the front and rear support rods) can be adjusted.

[0035] The upper and lower edges of the viewfinder plane lens are mounted on the front support rod of the lens holder via lens fixing components. The lens fixing components include a lower fixing member and an upper fixing member. The lower fixing member is a lens support plate 13, which is mounted on the front support rod, and the lower edge of the viewfinder plane lens is supported by the lens support plate bracket. The upper fixing member mainly consists of a lens clamp 14, a support rod sleeve 15, and an upper connecting adjustment rod 16. The lens clamp has a snap-fit ​​groove 17 and a connecting handle 18, and the support rod sleeve has a sleeve ring 19 and a sliding handle 20. The upper connecting adjustment rod consists of two parallel rods with sliding slots. The snap-fit ​​groove engages with the upper edge of the viewfinder plane lens, and the sleeve ring is fitted onto the upper part of the front support rod. One end of the upper connecting adjustment rod is rotatably connected to the connecting handle, and the upper part of the front support rod passes between the two parallel rods. An adjustment screw is provided on the sliding handle, and the adjustment screw is slidably connected in the sliding slots of the two parallel rods. By adjusting the upper connecting adjustment rod, the front-to-back (tilt) position of the viewfinder plane lens can be adjusted.

[0036] The sliding pen includes a sliding block 22 and a positioning pen 23. The positioning pen is fixed to the sliding block, and its tip (only for positioning, so no lead) protrudes from the outside of the sliding block and is located on the same side of the rotating rod as the center of the pivot hole for easy observation and positioning (because if the tip of the positioning pen is located within the projection of the sliding block, the viewer's line of sight will be blocked by the sliding block, making accurate positioning difficult). The sliding block has a sliding channel 24 and a fixing screw hole 25. The sliding block is slidably fitted onto the rotating rod through the sliding channel, and the fixing screw 26 is positioned on the rotating rod through the fixing screw hole. Therefore, the sliding pen can slide along the rotating rod to its selected position and be positioned there. The length of the rotating rod is not less than the distance from the pivot to the top corner of the rectangle, so that the sliding pen on the rotating rod can be positioned at any position on the viewfinder (or drawing board).

[0037] A pivot hole is provided at the center of the lower edge of the drawing board and the viewfinder plane lens. The lower end of the pivot is rotatably connected to the pivot hole, and the upper end of the pivot is fixedly connected to the rotating block 27. The rotating block has a through hole 28 for the rotating rod parallel to the drawing board and the viewfinder plane lens. The lower end of the rotating rod is connected to the rotating block through the through hole. The vertical distance between the center of the pivot hole (which is also the axis of the pivot, i.e., the radiating point) and the rotating rod (projected onto the viewfinder lens or drawing board) is equal to the vertical distance between the tip of the positioning pen and the rotating rod (projected onto the viewfinder lens or drawing board). Thus, by connecting two parallel lines of unequal length on adjacent radial lines, two similar triangles of unequal size are obtained. Since the other two corresponding sides of the similar triangles are precisely the radial lines of these adjacent points (these two lines are not actually drawn on the paper in practice), and the included angle of these adjacent radial lines is precisely the corresponding angle of the two similar triangles, which are equal and overlap, based on the geometric principle that "corresponding sides of similar triangles are proportional," and by combining a viewfinder, rotating rod, and sliding pen in street scene (building) drawing, one can create architectural graphics with accurate proportions, similar shapes, and conforming to architectural perspective rules (as described in the prior patent specification). Figure 7 ).

[0038] To facilitate more accurate drawing, an equal-angle rotation conversion module can be added. This module allows the rotation angle of the viewfinder's rotating rod to be transferred to the drawing board's rotating rod, thus enabling the viewfinder and the drawing board (paper) to "create" two similar triangles.

[0039] The isotropic rotation conversion mold mainly consists of a sleeve, an extension plate, and a mold. A pivot fixing plate 29 is located at the center of the lower edge of the drawing board and the viewfinder lens. The pivot fixing plate has a pivot hole 30, and a protruding insert block 31 (such as a cube) is located below the pivot hole. The sleeve 37 has a groove that matches the insert block (such as a hollow cubic groove). The extension plate 32 is vertically positioned on the outside of the sleeve. The mold includes a rotating circular piece 33, with a pair of symmetrically parallel external locking blocks 34 arranged on both sides of the center of the rotating circular piece. The rotating circular piece is rotatably connected to the extension plate via a rotating positioning screw 35 at its center. A pair of symmetrically parallel internal locking blocks 36 matching the external locking blocks are arranged on both sides of the center of the rotating block where it connects to the pivot. The isotropic rotation conversion mold is inserted into the insert block via the sleeve, and the external locking blocks of the mold are inserted into the external locking blocks of the rotating block (i.e., the inner width of the two external locking blocks is exactly equal to the outer width of the internal locking blocks).

[0040] II. Working Principle

[0041] Basic principle:

[0042] To draw a street scene (building), you first need to determine the position of the building's outline as seen in the viewfinder (a "position" is the intersection of straight lines representing the building's shape, or the two endpoints of a straight line). This is done by rotating the lever around the axis by a certain angle and then using the pen to define the position. Since the viewfinder and drawing board are separate, this rotation angle is transferred to the drawing board using an equal-angle rotation conversion module on the axis. This causes the lever on the drawing board to rotate by the same angle, thus allowing the position determined by the viewfinder to be located and magnified onto the drawing board using the lever and pen, based on the principle of proportional sides of similar triangles radiating from points.

[0043] The principle of constant angle rotation conversion mode:

[0044] Once the subject is determined by the viewfinder, first loosen the rotation positioning screws on the extension plate slightly. The architectural outline should be drawn starting with its large external shape, using this as a scale for magnification. The artist rotates the rotating rod from its original position on the viewfinder (left or right). At this point, because the two external locking blocks of the rotating circular plate on the extension plate are inserted outside the two internal locking blocks of the rotating block on the viewfinder's axis, the rotating mold also rotates around the radial point. Simultaneously, the slider on the rotating rod is positioned to the intersection point (first) of the straight lines of the drawn architectural shape. The rotation angle is now determined. Tighten the fixing screws of the slider and the rotation positioning screws on the mold, and simultaneously tighten the screws securing the rotating rod at the edge of the viewfinder's front end. Afterward, remove the equal-angle rotation conversion mold from the insertion block on the viewfinder and insert it onto the insertion block on the drawing board. Simultaneously, insert the two external locking blocks of the mold into the two internal locking blocks of the rotating block on the drawing board's axis. At this point, the angle at which the drawing board rotating rod rotates is equal to the angle at which the rotating rod rotates, as determined by the viewfinder plane lens.

[0045] III. Usage Method

[0046] 1. The artist selects and determines the street scene objects (such as buildings) as the drawing objects.

[0047] 2. Insert the sleeve with the extension plate onto the insert block below the rotating shaft in the viewfinder plane lens. At the same time, insert one pair of external locking blocks on the extension plate onto the pair of internal locking blocks on the rotating block on the rotating shaft, and slightly loosen the rotation positioning screws on the extension plate.

[0048] 3. Set up the lens stand, so that the viewfinder plane lens is facing the street scene (building) to be drawn, and adjust the height and tilt angle of the plane lens so that the street scene (building) is reflected in the viewfinder plane lens in a flat manner.

[0049] 4. Fix the drawing paper to the drawing board, and the artist sits in front of the viewfinder stand, holding the drawing board and sketching tools (such as a pencil).

[0050] 5. Adjust the distance between the artist's eye and the viewfinder lens, and determine the spatial position of the eye relative to the lens. Once determined, keep the eye position basically unchanged from beginning to end so that the image of the target being drawn is "fixed" on the lens.

[0051] 6. Observe the street scene (building) graphic to be drawn in the viewfinder. Use colored pencils to draw several major basic points of the graphic on the lens surface. When measuring (each time) other new points, first align the previously determined basic points, then rotate the rotating rod to the position of the straight line point, and at the same time slide the slider on the rotating rod to the position of the straight line point, so that the tip of the slider is positioned at the straight line point. At this point, the rotation angle is determined. Then, tighten the fixing screw of the slider, the fixing screw of the rotating rod fixing clamp, and the rotation positioning screw on the extension plate. Next, remove the isotropic rotation conversion mold from the insert on the viewfinder plane lens and insert it onto the insert on the drawing board. Simultaneously, insert the two external clips of the mold onto the two internal clips of the rotating block on the drawing board's axis. Tighten the fixing screws of the rotating rod clamp on the drawing board. Then, slide the slider on the rotating rod to the desired magnification height and tighten the fixing screw on the slider. Draw the point on the drawing paper plane aligned with the slider tip using a pencil. The inclination of the straight line connecting this point can then be drawn. Since the rotation angle of the other end of this line is not yet determined, the exact length of the line is also undetermined. Furthermore, since architectural drawings often employ angular perspective, these straight lines are mostly tilted to varying degrees. However, if parallel perspective is used, the line should appear as a horizontal straight line. When drawing this line, it is essential to refer to the tilt of the architectural line magnified by the viewfinder and visually estimate that it should be drawn as parallel as possible to the magnified line (or design a similar iso-angle rotation modifier on the pen slider to accurately draw the tilt of the line segment connected to its point). At this point, the iso-angle rotation modifier can be removed from the drawing board and inserted back into the viewfinder to continue the operation using the same method as before. After the drawing board's rotating rod rotates by the same angle through the equal-angle rotation conversion mold, and the rotating rod is fixed to the drawing board by the rotating rod fixing clamp, slide the sliding pen on the rotating rod to the extension position of the inclined line drawn at the previous point. The intersection of the pen tip and the inclined line is the endpoint of the inclined line. Draw this point with a pencil, and erase any excess inclined line after determining the point. This completes the drawing of the enlarged inclined straight line. The drawing of other straight lines and line segments can be done in the same way.

[0052] In summary, the point-radial street scene building sketching outline auxiliary drawing positioning amplifier of the present invention can be widely used as an auxiliary tool for accurately drawing street scene building outlines in hand-drawn sketches of street scenes (buildings). Based on the principle that corresponding sides of similar triangles are proportional, the linear points of the outline of the object to be drawn are positioned by sliding the pen on the rotating rod. The sliding pen itself does not act as a drawing tool; the actual drawing is completed by the sketching tool (such as a pencil) in the artist's hand. Applying this invention can not only save drawing time but also improve the artist's ability to observe and summarize the shape and features of the object being drawn.

Claims

1. A point-radial street scene building outline sketching auxiliary drawing positioning amplifier, characterized in that... It mainly includes a drawing board, a viewfinder plane lens, a lens stand, a rotating rod, and a sliding pen. The viewfinder plane lens is mounted on the lens stand, and the drawing board and the viewfinder plane lens are respectively equipped with corresponding rotating rods and sliding pens. The sliding pen is slidably mounted on the rotating rod. The lower end of the rotating rod is connected to the lower edge of the drawing board and the viewfinder plane lens through a rotating shaft, and the upper end of the rotating rod is mounted on the drawing board and the viewfinder plane lens through a rotating rod fixing clip.

2. The point-radial street scene building outline auxiliary drawing positioning amplifier according to claim 1, characterized in that: The drawing board and the viewing plane lens are similar rectangles with the same length and width ratio, and the size of the drawing board is not smaller than that of the viewing plane lens.

3. The point-radial street scene building outline auxiliary drawing positioning amplifier according to claim 1, characterized in that: The lens stand includes a front support rod and a rear support rod. The top of the rear support rod is hinged to the upper part of the front support rod. The upper middle part of the front support rod and the upper middle part of the rear support rod are connected by a lower connecting adjustment rod. A triangular support plate is provided at the lower part of the front support rod. The lower connecting adjustment rod consists of two parallel rods with sliding slot holes. One end of the lower connecting adjustment rod is rotatably connected to the upper middle part of the front support rod. An adjustment screw is provided at the upper middle part of the rear support rod, and the adjustment screw is slidably connected in the sliding slot holes of the two parallel rods. Folding hinges are provided in the middle of the front and rear support rods.

4. The point-radial street scene building outline auxiliary drawing positioning amplifier according to claim 3, characterized in that: The upper and lower edges of the viewfinder plane lens are mounted on the front support rod of the lens stand via a lens fixing component. The lens fixing component includes a lower fixing member and an upper fixing member. The lower fixing member is a lens support plate, which is mounted on the front support rod, and the lower edge of the viewfinder plane lens is supported by the lens support plate bracket. The upper fixing member mainly consists of a lens clamp, a support rod sleeve, and an upper connecting adjustment rod. The lens clamp has a snap-fit ​​groove and a connecting handle, and the support rod sleeve has a sleeve ring and a sliding handle. The upper connecting adjustment rod consists of two parallel rods, each with a sliding strip hole. The snap-fit ​​groove snaps into the upper edge of the viewfinder plane lens, and the sleeve ring is sleeved on the upper part of the front support rod. One end of the upper connecting adjustment rod is rotatably connected to the connecting handle, and the upper part of the front support rod passes between the two parallel rods. An adjustment screw is provided on the sliding handle, and the adjustment screw is slidably connected in the sliding strip hole of the two parallel rods.

5. The point-radial street scene building outline auxiliary drawing positioning amplifier according to claim 1, characterized in that: The sliding pen includes a sliding block and a positioning pen. The positioning pen is fixed on the sliding block, and the tip of the positioning pen protrudes out of the outside of the sliding block. The sliding block has a sliding channel and a fixing screw hole. The sliding block is slidably sleeved on the rotating rod through the sliding channel, and the fixing screw is positioned on the rotating rod through the fixing screw hole.

6. The point-radial street scene building outline auxiliary drawing positioning amplifier according to claim 1, characterized in that: The drawing board and the viewfinder plane lens have a pivot hole at the center of their lower edges. The lower end of the pivot is rotatably connected to the pivot hole, and the upper end of the pivot is fixedly connected to a rotating block. The rotating block has a through hole for a rotating rod parallel to the drawing board and the viewfinder plane lens. The lower end of the rotating rod is connected to the rotating block through the through hole.

7. The point-radial street scene building outline auxiliary drawing positioning amplifier according to claim 6, characterized in that: The vertical distance between the center of the pivot hole and the rotating rod is equal to the vertical distance between the tip of the positioning pen and the rotating rod.

8. The point-radial street scene building outline auxiliary drawing positioning amplifier according to claim 1, characterized in that: A pivot fixing plate is provided at the center of the lower edge of the drawing board and the viewfinder plane lens. The pivot fixing plate has a pivot hole, and a protruding insert is provided below the pivot hole.

9. The point-radial street scene building outline auxiliary drawing positioning amplifier according to claim 8, characterized in that... It also includes an equal-angle rotation conversion mold, which mainly consists of a tube, an extension plate, and a mold. The tube has a groove that matches the insert block, and the extension plate is vertically arranged on the outside of the tube. The mold includes a rotating circular piece, and a pair of external locking blocks are symmetrically and parallelly arranged on both sides of the center of the rotating circular piece. The rotating circular piece is rotatably connected to the extension plate by a rotating positioning screw at the center.

10. The point-radial street scene building outline auxiliary drawing positioning amplifier according to claim 9, characterized in that: A pair of inner connecting blocks are symmetrically and parallelly arranged on both sides of the center of the rotating block where it connects to the rotating shaft; the equal angle rotation conversion mold is inserted into the insert block through the insert tube, and the outer connecting block of the insert mold is inserted into the outer connecting block of the rotating block through the outer connecting block of the insert mold.

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