Focal length measuring device adopting coaxial auto-collimation method

Abstract

The utility model discloses a coaxial auto-collimation method focal length measuring device which comprises a base and an imaging plate arranged at one end of the top end of the base. The adjusting mechanism is arranged at one end of the imaging plate; the adjusting mechanism comprises a sliding rod arranged at the end, close to the center point in the base, of the imaging plate, a sliding seat slidably arranged outside the sliding rod, a fixed seat arranged at the top end of the sliding seat, a driving motor arranged in the middle of the bottom end of the fixed seat, and a driving bevel gear arranged at the output end of the driving motor. By arranging the base, the adjusting mechanism, the sliding seat, the sliding rod, the clamping blocks, the threaded block, the screw rod, the fixed seat, the driven bevel gear, the driving bevel gear, the driving motor and the imaging plate, the two clamping blocks can be driven to move synchronously by utilizing the work of the driving motor, so that lenses with different sizes can be fixed conveniently, and the imaging efficiency is improved. And the moving distances of the clamping blocks are the same, so that the center position of the lens cannot deviate.

Description

Technical Field

[0001] The utility model relates to the technical field of focal length measuring devices, in particular to a coaxial self-collimation method focal length measuring device. Background Art

[0002] Focal length is a basic parameter of the optical system, and it is a parameter that must be known during the assembly and adjustment of the optical system, and the lens is the most basic component of the optical system. Therefore, the focal length of the lens is naturally an important parameter to determine its object-image relationship. At the same time, whether the focal length of the lens is accurate will directly affect the entire optical system. In traditional focal length measurement, the coaxial autocollimation method is generally used to measure the focal length, so a coaxial autocollimation method focal length measurement device is needed.

[0003] With respect to the above-mentioned related technologies, the applicant believes that when the device is working, the lens is first fixed by a clamping block, and then the light of the irradiation lamp is passed through the middle of the lens and displayed on the imaging board, so that the focal length of the lens can be measured; and different types of lenses are of different sizes, so that when the lens is fixed, the clamping blocks on both sides move different distances to fix the lens, so that the light cannot accurately pass through the middle of the lens, thereby affecting the measurement accuracy of the device. Utility Model Content

[0004] The purpose of the utility model is to provide a coaxial self-collimation focal length measuring device to solve the problems of the device proposed in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a coaxial autocollimation focal length measuring device, comprising a base and an imaging plate, wherein the imaging plate is arranged at one end of the top of the base; an adjusting mechanism, wherein the adjusting mechanism is arranged at one end of the imaging plate, and the adjusting mechanism comprises a sliding rod arranged at one end of the imaging plate close to the inner center point of the base, a sliding seat slidably arranged outside the sliding rod, a fixed seat arranged at the top of the sliding seat, a driving motor arranged at the middle part of the bottom end of the fixed seat, an active bevel gear arranged at the output end of the driving motor, a driven bevel gear meshingly arranged at both ends of the active bevel gear, a screw rod arranged at the end of the driven bevel gear away from the driving motor, a threaded block with threads arranged outside the screw rod, and a clamping block arranged at the top of the threaded block.

[0006] By adopting the above technical solution, the two clamping blocks can be driven to move synchronously by the operation of the driving motor, which not only facilitates the fixation of lenses of different sizes, but also makes the moving distance of the clamping blocks the same, so that the center position of the lens will not be offset.

[0007] Preferably, a scale line is provided on one side of the top of the base, and the scale line is arranged parallel to the sliding seat.

[0008] By adopting the above technical solution, the focal length of the lens can be conveniently measured.

[0009] Preferably, an irradiation lamp is provided at one end of the sliding rod away from the imaging plate, and the irradiation lamp, the clamping block and the imaging plate are arranged on the same horizontal line.

[0010] By adopting the above technical solution, the measurement accuracy of the device can be improved.

[0011] Preferably, the sliding seat is configured to be concave, and the sliding seat is fixedly connected to the fixed seat.

[0012] By adopting the above technical solution, the fixing seat can be effectively supported.

[0013] Preferably, the interior of the fixing seat is configured to be hollow, and a movable groove is provided at the top of the fixing seat.

[0014] By adopting the above technical solution, the threaded block can be facilitated to perform reciprocating motion.

[0015] Preferably, a protective mechanism is provided on the inner side of the clamping block, and the protective mechanism includes a mounting groove opened around the inner side of the clamping block, a magnet block arranged inside the mounting groove, a protective pad arranged on the inner side of the clamping block, and connecting rods arranged around the side of the protective pad close to the clamping block.

[0016] By adopting the above technical solution, the lens to be clamped can be protected by providing a protective pad, and the practicability of the device can be effectively improved by replacing the protective pad.

[0017] Preferably, the connecting rod is made of metal, and the connecting rod is magnetically connected to the magnet block.

[0018] By adopting the above technical solution, the protective pad can be conveniently fixed.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] 1. By providing a base, an adjustment mechanism, a sliding seat, a sliding rod, a clamping block, a threaded block, a screw, a fixed seat, a driven bevel gear, an active bevel gear, a driving motor and an imaging plate, the two clamping blocks can be driven to move synchronously by the operation of the driving motor, which is not only convenient for fixing lenses of different sizes, but also makes the moving distance of the clamping blocks the same, so that the center position of the lens will not be offset;

[0021] 2. By providing a clamping block, a protective mechanism, a protective pad, a connecting rod, a mounting groove and a magnet block, the protective pad can be provided to protect the lens to be clamped, and the practicability of the device can be effectively improved by replacing the protective pad. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the utility model;

[0023] Figure 2 This is a schematic diagram of the overall front view structure of the utility model;

[0024] Figure 3 For this utility model Figure 2 The enlarged structural diagram at A in the middle;

[0025] Figure 4 For this utility model Figure 2 Enlarged structural diagram at B in the middle.

[0026] In the figure: 1. irradiation lamp; 2. base; 3. adjustment mechanism; 301. sliding seat; 302. sliding rod; 303. clamping block; 304. threaded block; 305. screw; 306. fixed seat; 307. driven bevel gear; 308. driving bevel gear; 309. driving motor; 4. scale line; 5. imaging plate; 6. protection mechanism; 601. protection pad; 602. connecting rod; 603. mounting groove; 604. magnet block. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] See also Figures 1 to 3The utility model provides a technical solution: a coaxial autocollimation focal length measuring device, comprising a base 2 and an imaging plate 5, wherein the imaging plate 5 is arranged at one end of the top of the base 2; an adjusting mechanism 3, wherein the adjusting mechanism 3 is arranged at one end of the imaging plate 5, and can conveniently fix lenses of different sizes, wherein the adjusting mechanism 3 comprises a sliding rod 302 arranged at one end of the imaging plate 5 close to the inner center point of the base 2, wherein the sliding rod 302 can provide a bearing force, and a sliding seat 301 slidably arranged outside the sliding rod 302, wherein a scale line 4 is arranged on one side of the top of the base 2, The scale line 4 is arranged in parallel with the sliding seat 301, which can facilitate the measurement of the focal length of the lens; a fixed seat 306 is arranged at the top of the sliding seat 301, and the sliding seat 301 is arranged in a concave shape. The sliding seat 301 and the fixed seat 306 are fixedly connected, which can effectively support the fixed seat 306; a driving motor 309 is arranged in the middle part of the bottom end of the fixed seat 306, and an active bevel gear 308 is arranged at the output end of the driving motor 309, which meshes with the driven bevel gears 307 arranged at both ends of the active bevel gear 308, and the driven bevel gears 307 arranged at the driven bevel gears The wheel 307 is far away from the screw rod 305 at one end of the driving motor 309, the thread is set on the thread block 304 outside the screw rod 305, the interior of the fixed seat 306 is set to be hollow, and the top of the fixed seat 306 is provided with a movable groove, which can facilitate the reciprocating movement of the thread block 304; the clamping block 303 set at the top of the thread block 304, by the operation of the driving motor 309, can drive the screw rod 305 to rotate through the transmission of the active bevel gear 308 and the driven bevel gear 307, so that the two clamping blocks 303 can be driven to move synchronously toward the lens Movement not only facilitates the fixation of lenses of different sizes, but also makes the moving distance of the clamping block 303 the same, so that the center position of the lens will not be offset; an irradiation lamp 1 is arranged at the end of the sliding rod 302 away from the imaging plate 5, and the irradiation lamp 1, the clamping block 303 and the imaging plate 5 are arranged on the same horizontal line. The irradiation lamp 1 is used to emit parallel light to the lens, and the light is displayed on the imaging plate 5 after passing through the lens, and then the sliding seat 301 is moved to make the light spot on the imaging plate 5 clearly displayed, and then the focal length can be preliminarily measured by observing the scale line 4.

[0029] See also Figure 4 A protective mechanism 6 is arranged on the inner side of the clamping block 303, and the protective mechanism 6 includes a mounting groove 603 opened around the inner side of the clamping block 303, a magnet block 604 arranged inside the mounting groove 603, and a protective pad 601 arranged on the inner side of the clamping block 303, which can protect the lens to be clamped and try to avoid the clamping block 303 from causing damage to the lens; a connecting rod 602 is arranged around the protective pad 601 close to one side of the clamping block 303, and the connecting rod 602 is made of metal. The connecting rod 602 and the magnet block 604 are magnetically connected. The protective pad 601 can be easily removed for replacement by pulling apart the connecting rod 602 and the magnet block 604.

[0030] Working principle: First, insert the connecting rod 602 on the protective pad 601 into the inside of the installation groove 603, and use the magnet block 604 to magnetically connect the connecting rod 602, so that the protective pad 601 can be installed on the clamping block 303, so as to protect the lens to be clamped and try to avoid the clamping block 303 from causing damage to the lens; then, by placing the lens to be measured directly above the fixed seat 306, using the work of the driving motor 309, through the transmission of the active bevel gear 308 and the driven bevel gear 307, the screw 305 can be driven to rotate, so that the two clamping blocks 303 can be driven to move toward the lens synchronously, which is not only convenient for fixing lenses of different sizes, but also makes the moving distance of the clamping block 303 the same, so that the center position of the lens will not be offset; secondly, use the irradiation lamp 1 to emit parallel light to the lens, and the light is displayed on the imaging plate 5 after passing through the lens, and then the light spot on the imaging plate 5 is displayed clearly by moving the sliding seat 301. At this time, the focal length can be preliminarily measured by observing the scale line 4.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A coaxial autocollimation focal length measuring device, characterized in that: include: Base (2); An imaging plate (5), the imaging plate (5) being arranged at one end of the top of the base (2); An adjusting mechanism (3) is arranged at one end of an imaging plate (5), and comprises a sliding rod (302) arranged at one end of the imaging plate (5) close to the inner center point of a base (2), a sliding seat (301) slidably arranged outside the sliding rod (302), a fixing seat (306) arranged at the top end of the sliding seat (301), a driving motor (309) arranged at the middle part of the bottom end of the fixing seat (306), an active bevel gear (308) arranged at the output end of the driving motor (309), a driven bevel gear (307) meshingly arranged at both ends of the active bevel gear (308), a screw rod (305) arranged at one end of the driven bevel gear (307) away from the driving motor (309), a threaded block (304) threadedly arranged outside the screw rod (305), and a clamping block (303) arranged at the top end of the threaded block (304).

2. The coaxial autocollimation focal length measuring device according to claim 1, characterized in that: A scale line (4) is arranged on one side of the top end of the base (2), and the scale line (4) is arranged parallel to the sliding seat (301).

3. The coaxial autocollimation focal length measuring device according to claim 1, characterized in that: An irradiation lamp (1) is arranged at one end of the sliding rod (302) away from the imaging plate (5); the irradiation lamp (1), the clamping block (303) and the imaging plate (5) are arranged on the same horizontal line.

4. The coaxial autocollimation focal length measuring device according to claim 1, characterized in that: The sliding seat (301) is configured to be concave, and the sliding seat (301) is fixedly connected to the fixing seat (306).

5. The coaxial autocollimation focal length measuring device according to claim 1, characterized in that: The interior of the fixing seat (306) is configured to be hollow, and a movable groove is provided at the top of the fixing seat (306).

6. The coaxial autocollimation focal length measuring device according to claim 1, characterized in that: A protective mechanism (6) is arranged on the inner side of the clamping block (303), and the protective mechanism (6) comprises a mounting groove (603) provided around the inner side of the clamping block (303), a magnet block (604) arranged inside the mounting groove (603), a protective pad (601) arranged on the inner side of the clamping block (303), and a connecting rod (602) arranged around a side of the protective pad (601) close to the clamping block (303).

7. The coaxial autocollimation focal length measuring device according to claim 6, characterized in that: The connecting rod (602) is made of metal, and the connecting rod (602) is connected to the magnet block (604) through magnetism.

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