CN214121559U

CN214121559U - Lens clamping device and light transmittance detection equipment applying same

Info

Publication number: CN214121559U
Application number: CN202022946773.2U
Authority: CN
Inventors: 肖顺东; 覃亚
Original assignee: Guangdong Beichuang Optoelectronics Technology Co ltd
Current assignee: Guangdong Beichuang Optoelectronics Technology Co ltd
Priority date: 2020-12-10
Filing date: 2020-12-10
Publication date: 2021-09-03
Anticipated expiration: 2030-12-10

Abstract

The utility model discloses a camera lens clamping device and use its luminousness check out test set. The lens clamping device comprises a supporting rod, a first clamping mechanism and a second clamping mechanism which are distributed up and down, wherein the first clamping mechanism and the second clamping mechanism are both adjustably arranged on the supporting rod; the upper end and the lower end of the lens can be respectively clamped at the working ends of the first clamping mechanism and the second clamping mechanism. The light transmittance detection equipment comprises the lens clamping device, a base, a light path device and an integrating sphere device, wherein the light path device, the lens and the integrating sphere device are positioned on the same straight line. This equipment can detect the straight section of thick bamboo camera lens of multiple not unidimensional length, and the commonality is strong. The equipment is simple in structure, easy and convenient to operate, low in operation threshold and high in practicability.

Description

Lens clamping device and light transmittance detection equipment applying same

Technical Field

The utility model relates to an optical detection device, equipment technical field, in particular to camera lens clamping device, luminousness check out test set.

Background

The light transmittance is an important index for the definition of an object to be viewed and also an important index for representing the optical performance of the dielectric material, especially the light transmittance of a lens, so that a manufacturer judges whether the optical performance of the dielectric material is qualified or not by detecting the transmittance and setting a proper quality inspection standard.

SUMMERY OF THE UTILITY MODEL

According to one aspect of the utility model, a lens clamping device is provided, which comprises a support rod, a first clamping mechanism and a second clamping mechanism which are distributed up and down, wherein the first clamping mechanism and the second clamping mechanism are both adjustably arranged on the support rod; the upper end and the lower end of the lens can be respectively clamped at the working ends of the first clamping mechanism and the second clamping mechanism, and the working end of the second clamping mechanism is provided with a supporting sheet for supporting the lower end face of the lens.

The utility model provides a device for clamp tightly is carried out the camera lens. The upper end and the lower end of the lens are clamped by the first clamping mechanism and the second clamping mechanism which are distributed up and down, and the first clamping mechanism and the second clamping mechanism can slide and adjust in the vertical direction, so that the lenses with different lengths can be clamped. Utilize the support piece to carry out the bearing to the lower extreme of camera lens, gliding when preventing lens centre gripping. The device has the advantages of simple structure, simple and convenient operation, low operation threshold and strong practicability.

In some embodiments, the first clamping mechanism includes a first mounting seat, a first guide rod, two symmetrically distributed first fixed side plates, and two symmetrically distributed first clamp assemblies, the two first fixed side plates are disposed on the first mounting seat, the first guide rod is disposed between the two first fixed side plates, and the two first clamp assemblies are adjustably disposed on the first guide rod.

Therefore, in the first clamping mechanism, the first mounting seat is used as an adjusting fixed seat of the mechanism and can be adjusted on the supporting rod in a vertical sliding manner; the two first clamp assemblies are adjustably arranged on the first guide rod, and the working ends of the two first clamp assemblies clamp the upper part of the lens.

In some embodiments, the first clamp assembly includes an adjusting rod, a first slider, and a first clamping piece, the first slider is slidably disposed on the first guide rod, the first clamping piece is disposed on the first slider, the adjusting rod is adjustably disposed on the first stationary side plate, and one end of the adjusting rod is connected to the first slider.

Therefore, in the first clamp assembly, the relative position of the first sliding block is adjusted through the adjusting rod, so that clamping is realized.

In some embodiments, the second clamping mechanism includes a second mounting seat, a second guide rod, two symmetrically distributed second fixed side plates, and two symmetrically distributed second clamp assemblies, the two second fixed side plates are disposed on the second mounting seat, the second guide rod is disposed between the two second fixed side plates, and the two second clamp assemblies are adjustably disposed on the guide rod.

Therefore, in the second clamping mechanism, the second mounting seat is used as an adjusting fixed seat of the mechanism and can be adjusted on the supporting rod in a vertical sliding manner; the two second clamp assemblies are adjustably arranged on the second guide rod, and the working ends of the two second clamp assemblies clamp the lower part of the lens.

In some embodiments, the second clamp assembly includes a pull rod, a second slider, a second clamping piece, and a spring, the second slider is slidably disposed on the second guide rod, the second clamping piece is disposed on the second slider, the pull rod is slidably disposed on the second fixed side plate, one end of the pull rod is connected to the second slider, and the spring is sleeved on the second guide rod and located between the second slider and the second fixed side plate.

Therefore, in the second clamp assembly, the second sliding block is applied with force through the spring, so that clamping is realized.

According to the utility model discloses an aspect still provides luminousness check out test set, including the foretell camera lens clamping device of right, still include base, light path device and integrating sphere device, the integrating sphere device is located on the base, be equipped with the bracing piece on the base, the upper portion of bracing piece is located to the light path device, the middle part of bracing piece is located to camera lens clamping device, the camera lens has been placed to camera lens clamping device, light path device, camera lens, integrating sphere device are located same straight line.

The utility model provides a can be to the luminousness of camera lens carry out the equipment that detects, assay. In the equipment, a lens is clamped on a lens clamping device, light beams are input from an input end of an optical path device, are shaped in the optical path device and then penetrate through the lens, and then are collected in an integrating sphere device, and the integrating sphere device performs data processing on the light beams. This equipment can detect multiple straight section of thick bamboo camera lens, and this equipment structure is simple, and is easy and simple to handle, and the operation threshold is low, and the practicality is strong.

In some embodiments, the optical path device includes a fixed cylinder, an entrance pupil, a first lens, a second lens, a third lens, and an exit pupil, the fixed cylinder is installed on the upper portion of the support rod, the entrance pupil and the exit pupil are respectively disposed at the upper and lower ends of the fixed cylinder, the first lens and the second lens are disposed in the entrance pupil, the third lens is disposed in the fixed cylinder, and the first lens, the second lens, and the third lens are distributed from top to bottom.

Therefore, the optical path device takes the fixed cylinder as a mounting bracket of each optical path part, the entrance pupil, the first lens, the second lens, the third lens and the exit pupil are sequentially distributed on the fixed cylinder from top to bottom, the entrance pupil receives the light beam, then the light beam is shaped through the first lens, the second lens and the third lens, and finally the light beam is output through the exit pupil.

In some embodiments, the exit pupil is arranged at the lower end of the fixed cylinder through an adjusting sleeve, a plurality of limiting columns are arranged on the outer wall array of the lower end of the fixed cylinder, a plurality of adjusting grooves are arranged on the outer wall of the adjusting sleeve, and the adjusting grooves are matched with the limiting columns; through the rotation adjusting sleeve, the adjusting sleeve can move forward and backward along the vertical direction.

Therefore, the exit pupil can be adjusted in a sliding mode in the vertical direction, focusing adjustment can be achieved, and the adjustable focusing lens is suitable for lenses with different lengths.

In some embodiments, the optical path device is disposed on the upper portion of the support rod through an adjusting mechanism, the adjusting mechanism includes an adjusting block and a fixing ring, the fixing ring is disposed on the adjusting block, the optical path device is fixed on the fixing ring, and the adjusting block is adjustably disposed on the support rod.

Therefore, the relative height of the optical path device can be adjusted, and the lenses with different lengths can be detected, so that the universality of the equipment is improved.

The beneficial effects of the utility model are that: this equipment can detect the straight section of thick bamboo camera lens of multiple not unidimensional length, and the commonality is strong. The equipment is simple in structure, easy and convenient to operate, low in operation threshold and high in practicability.

Drawings

Fig. 1 is a schematic view of a three-dimensional structure of a light transmittance detection device according to an embodiment of the present invention.

Fig. 2 is a schematic cross-sectional structure diagram of the transmittance detection apparatus shown in fig. 1.

Fig. 3 is a schematic cross-sectional structure diagram of an optical path device in the light transmittance detection apparatus shown in fig. 2.

Fig. 4 is a schematic plan view of the lens part of the optical path apparatus shown in fig. 3.

Fig. 5 is a schematic perspective view illustrating a lens clamping device in the light transmittance detection apparatus shown in fig. 1.

Fig. 6 is a schematic perspective view of a first clamping mechanism in the lens clamping device shown in fig. 5.

Fig. 7 is a schematic perspective view of a second clamping mechanism in the lens clamping device shown in fig. 5.

Fig. 8 is a schematic plan view showing a detection system to which the light transmittance detection apparatus of fig. 1 is applied.

Reference numbers in the figures: 0-base, 1-light path device, 11-fixed cylinder, 111-limit column, 12-entrance pupil, 13-first lens, 14-second lens, 15-third lens, 16-exit pupil, 17-adjusting sleeve, 171-adjusting groove, 18-adjusting mechanism, 181-adjusting block, 182-fixed ring, 2-lens clamping device, 21-first clamping mechanism, 211-first mounting seat, 212-first guide rod, 213-first fixed side plate, 214-first clamp component, 2141-adjusting rod, 2142-first slide block, 2143-first clamp piece, 22-second clamping mechanism, 221-second mounting seat, 222-second guide rod, 223-second fixed side plate, 224-second clamp component, 2241-pull rod, 2242-second slide block, 2243-second clamping piece, 2244-spring, 2245-supporting piece, 3-integrating sphere device, 23-supporting rod, 31-integrating sphere, 32-data processor, 33-outer cover, 4-light source device, 5-analysis device and a-lens.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Fig. 1-2 schematically show a light transmittance detection apparatus according to an embodiment of the present invention, including a base 0, an optical path device 1, a lens clamping device 2, and an integrating sphere device 3. A protective outer cover 33 is arranged on the base 0, the integrating sphere device 3 is arranged on the base 0 and is positioned in the protective outer cover 33, a through hole is formed in the protective outer cover 33, and a receiving end of the integrating sphere device 3 receives incident light beams through the through hole; the lens clamping device 2 comprises a supporting rod 23, the light path device 1 is arranged on the upper portion of the supporting rod 23, the working end of the lens clamping device 2 is located in the middle of the supporting rod 23, the lens a is placed on the lens clamping device 2, and the light path device 1, the lens a and the integrating sphere device 3 are located on the same straight line.

The utility model provides a can be to the luminousness of camera lens a carry out equipment that detects, assay. In the device, a lens a is clamped on a lens clamping device 2, light beams are input from an input end of an optical path device 1, are shaped in the optical path device 1 and then penetrate through the lens a, and then are collected in an integrating sphere device 3, and the integrating sphere device 3 processes the light beams. This equipment can detect multiple straight section of thick bamboo camera lens a, and this equipment structure is simple, and is easy and simple to handle, and the operation threshold is low, and the practicality is strong.

With reference to fig. 2-3, the optical path device 1 includes a fixed cylinder 11, an entrance pupil 12, a first mirror 13, a second mirror 14, a third mirror 15, and an exit pupil 16. The fixed cylinder 11 is in a straight cylinder shape, the inside of the fixed cylinder is hollow, and the fixed cylinder 11 is arranged at the upper part of the support rod 23; the entrance pupil 12 and the exit pupil 16 are respectively arranged at the upper end and the lower end of the fixed cylinder 11; the first lens 13, the second lens 14 are arranged in the entrance pupil 12, the third lens 15 is arranged in the fixed cylinder 11, the first lens 13, the second lens 14 and the third lens 15 are distributed from top to bottom, and the first lens 13, the second lens 14 and the third lens 15 are distributed from top to bottom.

Referring to fig. 4, in the present embodiment, the first lens 13, the second lens 14, and the third lens 15 are all made of quartz lenses; the first lens 13 is a plano-convex lens, the radius of the arc of the upper convex surface Ra is 8.26mm, and the center thickness Ha is 2.02 mm; the second lens 14 is a biconvex lens, and the radii of the arcs of the upper convex surface and the lower convex surface are respectively: rb is 18.27mm, Rc is 28.57mm, and the center thickness is Hb 3.11 mm; the third lens 15 is a biconvex lens, and the radii of the arcs of the upper convex surface and the lower convex surface are respectively as follows: rd 76.29mm, Re 76.29mm, and Hb 5mm in center thickness. The distance between the first lens 13 and the second lens 14 is: la ═ 3.11mm, and the distance between the second lens 14 and the third lens 15 is: lb is 204.01 mm.

The optical path device 1 uses a fixed cylinder 11 as a mounting bracket for each optical path component, an entrance pupil 12, a first lens 13, a second lens 14, a third lens 15 and an exit pupil 16 are distributed on the fixed cylinder 11 from top to bottom in sequence, the entrance pupil 12 receives light beams, then the light beams are shaped through the first lens 13, the second lens 14 and the third lens 15, and finally the light beams are output through the exit pupil 16.

Referring to fig. 3, the exit pupil 16 is disposed at the lower end of the fixed cylinder 11 through the adjusting sleeve 17, the outer wall array of the lower end of the fixed cylinder 11 is provided with a plurality of limiting posts 111, the outer wall of the adjusting sleeve 17 is provided with a plurality of adjusting grooves 171, and the adjusting grooves 171 are matched with the limiting posts 111; by rotating the adjustment sleeve 17, the adjustment sleeve 17 can be moved forward and backward in the vertical direction. The exit pupil 16 can be adjusted to slide in the vertical direction, and can be adjusted to focus, so that the lens system is suitable for lenses a with different lengths.

Referring to fig. 1-2, the optical path device 1 is disposed on the upper portion of the supporting rod 23 via the adjusting mechanism 18, and the adjusting mechanism 18 includes an adjusting block 181 and a fixing ring 182. The fixing ring 182 is arranged on the adjusting block 181, and the optical path device 1 is fixed on the fixing ring 182; the adjusting block 181 is adjustably arranged on the support rod 23; the adjusting block 181 is sleeved on the support rod 23, and the adjusting block 181 is provided with a knob for adjustment and a bolt for fixing. The relative height of the optical path device 1 can be adjusted, and the lenses a with different lengths can be detected, so that the universality of the equipment is improved.

With reference to fig. 1 and 5, the lens clamping device 2 further includes a first clamping mechanism 21 and a second clamping mechanism 22 which are distributed vertically, working ends of the first clamping mechanism 21 and the second clamping mechanism 22 are located on the same straight line, and the first clamping mechanism 21 and the second clamping mechanism 22 are both adjustably disposed on the support rod 23.

The upper end and the lower end of the lens a are clamped by the first clamping mechanism 21 and the second clamping mechanism 22 which are distributed up and down, and the first clamping mechanism 21 and the second clamping mechanism 22 can be adjusted in a sliding mode in the vertical direction, so that the lenses a with different lengths can be clamped.

Referring to fig. 6, the first clamping mechanism 21 includes a first mounting seat 211, a first guide rod 212, two symmetrically distributed first fixed side plates 213, and two symmetrically distributed first clamp assemblies 214. The first mounting seat 211 is sleeved on the support rod 23, and a bolt for loosening and tightening is arranged on the first mounting seat 211; two first fixed side plates 213 are provided on both sides on the end surface of the first mount 211; two first guide rods 212 are arranged, and the two first guide rods 212 are arranged between the two first fixed side plates 213; two first clamp assemblies 214 are adjustably mounted on first guide rod 212. In the first clamping mechanism 21, the first mounting seat 211 is used as an adjusting fixed seat of the mechanism, and can be adjusted on the support rod 23 in a vertical sliding manner; two first clamp assemblies 214 are adjustably provided on the first guide rod 212, and working ends of the two first clamp assemblies 214 clamp an upper portion of the lens a.

Referring to fig. 6, the first clamp assembly 214 includes an adjustment rod 2141, a first sliding block 2142, and a first clamping piece 2143. The first sliding block 2142 is slidably disposed on the first guide rod 212, and the first clamping piece 2143 is disposed on the first sliding block 2142; the adjusting rod 2141 is adjustably disposed on the first fixed side plate 213, a threaded hole is formed in the first fixed side plate 213, the adjusting rod 2141 is a threaded rod, and one end of the adjusting rod 2141 is connected to the first sliding block 2142. In the first clamping assembly 214, the relative position of the first sliding block 2142 is adjusted by the adjusting rod 2141, thereby achieving clamping.

Referring to fig. 6, the second clamping mechanism 22 includes a second mounting seat 221, a second guide bar 222, two symmetrically distributed second fixed side plates 223, and two symmetrically distributed second clamp assemblies 224. The second mounting seat 221 is sleeved on the support rod 23, and a bolt for loosening and tightening is arranged on the second mounting seat 221; two second fixed side plates 223 are disposed on both sides on the end surface of the second mount 221; two second guide rods 222 are provided, and the two second guide rods 222 are provided between the two second fixed side plates 223; two second clamp assemblies 224 are adjustably mounted on the guide rods. In the second clamping mechanism 22, the second mounting seat 221 is used as an adjusting fixing seat of the mechanism, and can be adjusted on the support rod 23 in a vertical sliding manner; two second clamp assemblies 224 are adjustably provided on the second guide bar 222, and working ends of the two second clamp assemblies 224 clamp a lower portion of the lens a.

Referring to fig. 7, second clamp assembly 224 includes a pull rod 2241, a second slide block 2242, a second clamping piece 2243 and a spring 2244, second slide block 2242 is slidably disposed on second guide bar 222, and second clamping piece 2243 is disposed on second slide block 2242; the pull rod 2241 is slidably arranged on the second fixed side plate 223, a through hole is formed in the second fixed side plate 223, and the pull rod 2241 is sleeved on the through hole; one end of the pull rod 2241 is connected to the second sliding block 2242, and the spring 2244 is sleeved on the second guide bar 222 and located between the second sliding block 2242 and the second fixed side plate 223. In the second clamp assembly 224, the second slider 2242 is biased by a spring 2244, thereby clamping.

Referring to fig. 7, the second clip 2243 has a support 2245 on an inner side thereof, and the support 2245 is used to support a lower end of the lens a.

Referring to fig. 2, integrating sphere device 3 includes an integrating sphere 31 and a data processor 32. The integrating sphere 31 is arranged on the base 0 and positioned right below the optical path device 1, and the data processor 32 is arranged on the base 0 and connected with the integrating sphere device 3 through an optical fiber. For ease of installation, integrating sphere 31 is above data processor 32.

The integrating sphere 31 is connected with a data processor 32 through an optical fiber, and the data processor 32 processes the data and then transmits the data to the analysis device 5; and the software on the analysis device 5 receives the data conducted back by the processor to realize analysis measurement.

With reference to fig. 8, the present apparatus is applied to a detection system, where the detection system includes a light source apparatus 4 and an analysis apparatus 5, and the light source apparatus 4 is connected to the analysis apparatus 5 in a control manner. The light source device 4 is configured to provide a detection light beam (hereinafter referred to as a light beam), the light source device 4 is connected with an incident end (i.e., an entrance pupil 12) of the optical path apparatus 1 through an optical fiber, and the light source device 4 inputs the light beam into the optical path apparatus 1 through the optical fiber; the integrating sphere device 3 is in data connection with an output end (i.e. the data processor 32) of the analysis device 5, in this embodiment, the integrating sphere device 3 is connected with the data processor 32 through a data line, the analysis device 5 is an industrial computer, and analysis software is installed in the analysis device 5.

The detection optical path of the detection system in this embodiment is roughly: light source apparatus 4-light path means 1 (entrance pupil 12-first lens 13-second lens 14-third lens 15-exit pupil 16) -lens a-integrating sphere means 3 (integrating sphere 31-data processor 32).

The detection system comprises the following specific working steps:

s1, holding lens a: the lens a is held on the lens holding device 2.

S1.1, initial positioning: the eyepiece end of the lens a is clamped in the first clamping mechanism 21, the relative distance between the two clamp assemblies is larger than the diameter of the lens a by adjusting the first clamp assembly 214, and then the adjusting rods 2141 of the two first clamp assemblies 214 are synchronously rotated to make the first sliding blocks 2142 of the two first clamp assemblies 214 close to the middle until the first clamping pieces 2143 of the two first clamp assemblies 214 clamp the eyepiece of the lens a;

s1.1, clamping: the working end of the second clamping mechanism 22 is adjusted to be just level with the objective end of the lens a, the pull rod 2241 of the two second clamp assemblies 224 is pulled to be slowly loosened, the objective end of the lens a is clamped between the clamping pieces of the two second clamp assemblies 224, and the objective end of the lens a is clamped on the supporting piece 2245 of the two clamping pieces.

S2, starting the light source device 4: starting the light source device 4 and adjusting the appropriate light beam; the light source device 4 inputs light beams into the optical path apparatus 1 through optical fibers; in the optical path apparatus 1, the entrance pupil 12 receives the light beam of the light source device 4, then the light beam is shaped by the first lens 13, the second lens 14 and the third lens 15, and finally the light beam is output through the exit pupil 16;

s3, detection: the light beam penetrates through the lens a after being shaped by the light path device 1, the integrating sphere 31 collects the light beam, the integrating sphere 31 is connected with the data processor 32 through an optical fiber, and the data processor 32 transmits the data to the analysis device 5 after processing.

S4, data analysis: and the software on the analysis device 5 receives the data conducted back by the processor to realize analysis measurement.

This equipment can detect the straight section of thick bamboo camera lens a of multiple not unidimensional length, and the commonality is strong. Moreover, applied to the system, the detection data of the shot a is collected in the analysis device 5, and the analysis device 5 forms a complex data information chart, so that the data can be visually checked. The equipment is simple in structure, easy and convenient to operate, low in operation threshold and high in practicability.

What has been described above are only some embodiments of the invention. For those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are within the scope of the invention.

Claims

1. The lens clamping device is characterized by comprising a supporting rod (23), a first clamping mechanism (21) and a second clamping mechanism (22) which are distributed up and down, wherein the first clamping mechanism (21) and the second clamping mechanism (22) are both adjustably arranged on the supporting rod (23), and the first clamping mechanism (21) and the second clamping mechanism (22) are positioned on the same straight line; the upper and lower end of camera lens (a) can be centre gripping respectively the work end of first fixture (21), second fixture (22), the work end of second fixture (22) is equipped with and is used for carrying out the support piece (2245) that supports to camera lens (a) lower terminal surface.

2. The lens clamping device according to claim 1, wherein the first clamping mechanism (21) comprises a first mounting base (211), a first guide rod (212), two first fixed side plates (213) symmetrically distributed and two first clamp assemblies (214) symmetrically distributed, the two first fixed side plates (213) are arranged on the first mounting base (211), the first guide rod (212) is arranged between the two first fixed side plates (213), and the two first clamp assemblies (214) are adjustably arranged on the first guide rod (212).

3. The lens clamping device according to claim 2, wherein the first clamping assembly (214) comprises an adjusting rod (2141), a first sliding block (2142) and a first clamping piece (2143), the first sliding block (2142) is slidably disposed on the first guide rod (212), the first clamping piece (2143) is disposed on the first sliding block (2142), the adjusting rod (2141) is adjustably disposed on the first fixed side plate (213), and one end of the adjusting rod (2141) is connected to the first sliding block (2142).

4. The lens clamping device according to claim 1, wherein the second clamping mechanism (22) comprises a second mounting seat (221), a second guide rod (222), two symmetrically distributed second fixed side plates (223) and two symmetrically distributed second clamp assemblies (224), the two second fixed side plates (223) are arranged on the second mounting seat (221), the second guide rod (222) is arranged between the two second fixed side plates (223), and the two second clamp assemblies (224) are adjustably arranged on the guide rod.

5. The lens holding apparatus according to claim 4, wherein the second holder assembly (224) includes a pull rod (2241), a second slider (2242), a second clip (2243) and a spring (2244), the second slider (2242) is slidably disposed on the second guide rod (222), the second clip (2243) is disposed on the second slider (2242), the pull rod (2241) is slidably disposed on the second fixed side plate (223), one end of the pull rod (2241) is connected to the second slider (2242), and the spring (2244) is sleeved on the second guide rod (222) and is disposed between the second slider (2242) and the second fixed side plate (223).

6. Light transmittance detection equipment, including any one of the lens clamping device (2) of claims 1-5, characterized by, still include base (0), light path device (1) and integrating sphere device (3), integrating sphere device (3) is located on base (0), bracing piece (23) are located on base (0), the upper portion of bracing piece (23) is located to light path device (1), the middle part of bracing piece (23) is located to the work end of lens clamping device (2), camera lens (a) have been placed to lens clamping device (2), light path device (1), camera lens (a), integrating sphere device (3) are located same straight line.

7. The light transmittance detection apparatus according to claim 6, wherein the optical path device (1) comprises a fixed cylinder (11), an entrance pupil (12), a first lens (13), a second lens (14), a third lens (15) and an exit pupil (16), the fixed cylinder (11) is mounted on the upper portion of the support rod (23), the entrance pupil (12) and the exit pupil (16) are respectively disposed at the upper and lower ends of the fixed cylinder (11), the first lens (13) and the second lens (14) are disposed in the entrance pupil (12), the third lens (15) is disposed in the fixed cylinder (11), and the first lens (13), the second lens (14) and the third lens (15) are distributed from top to bottom.

8. The light transmittance detection device according to claim 7, wherein the exit pupil (16) is arranged at the lower end of the fixed cylinder (11) through an adjusting sleeve (17), a plurality of limiting columns (111) are arranged on the outer wall array of the lower end of the fixed cylinder (11), a plurality of adjusting grooves (171) are arranged on the outer wall of the adjusting sleeve (17), and the adjusting grooves (171) are matched with the limiting columns (111); by rotating the adjusting sleeve (17), the adjusting sleeve (17) can be moved forward and backward in the vertical direction.

9. Light transmittance detection apparatus according to claim 8, wherein the light path device (1) is disposed on the upper portion of the support rod (23) via an adjusting mechanism (18), the adjusting mechanism (18) comprises an adjusting block (181) and a fixing ring (182), the fixing ring (182) is disposed on the adjusting block (181), the light path device (1) is fixed on the fixing ring (182), and the adjusting block (181) is adjustably disposed on the support rod (23).