Novel focal length switching device

Abstract

The utility model discloses a novel focal length switching device which comprises a mounting frame, a rotating ring, fixing blocks and scraping strips, the rotating ring is movably mounted on the upper surface of the mounting frame, the fixing blocks are fixedly mounted on the upper surfaces of the two sides of the rotating ring, the scraping strips are movably mounted at the front ends of the fixing blocks, a mounting groove is formed in the upper surface of the mounting frame, and the scraping strips are movably mounted in the mounting groove. A through hole is formed in the lower surface of the interior of the mounting groove, embedding grooves are longitudinally formed in the surfaces of the two sides of the interior of the mounting groove, and an annular groove is formed in the position, located on the periphery of the mounting groove, of the upper surface of the mounting frame. According to the novel focal length switching device provided by the utility model, when the interior of the mounting groove needs to be cleaned, the focus reduction mirror is detached from the mounting groove, so that the scraping strip moves into the mounting groove under the pushing action of the spring, and when the rotating ring is rotated at the moment, the scraping strip moves to the mounting groove; and the inner surface of the mounting groove can be scraped and swept by using the scraping strip, so that the cleaning work is conveniently completed.

Description

Technical Field

[0001] This utility model relates to a lens cutting device, and in particular to a novel focal length switching device. Background Technology

[0002] A focal reducer is an accessory that reduces the focal length of a camera lens or astronomical telescope. In photography, it changes the path of light and shortens the actual focal length of the lens. In astronomical observation, it can shorten or reduce the focal length of a telescope, making the focal ratio brighter, expanding the image range, and correcting the image field and aberrations.

[0003] When installing focal reducers, multiple focal reducers are mounted on a switching device to facilitate switching between different focal reducers. By rotating the switching device, the focal reducers in different positions are aligned with the usage position for use. However, foreign objects may appear in the mounting position of the focal reducers, and the mounting position is quite deep, making cleaning difficult. Utility Model Content

[0004] The main objective of this invention is to provide a novel focal length switching device that can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A novel focus switching device includes a mounting frame, a rotating ring, a fixing block, and a scraper. The rotating ring is movably mounted on the upper surface of the mounting frame, and the fixing blocks are fixedly mounted on the upper surfaces of both sides of the rotating ring. A scraper is movably mounted on the front end of the fixing block.

[0007] More preferably, the upper surface of the mounting bracket is provided with a mounting groove, the lower inner surface of the mounting groove is provided with a through hole, the inner two side surfaces of the mounting groove are provided with embedding grooves longitudinally, and the upper surface of the mounting bracket and the periphery of the mounting groove are provided with an annular groove.

[0008] More preferably, the number of mounting slots is three, the diameter of the through hole is smaller than the diameter of the mounting slot, and the three mounting slots are distributed in a triangle on the upper surface of the mounting frame.

[0009] More preferably, an mounting ring is fixedly installed on the lower surface of the rotating ring, and grooves are formed on both inner side surfaces of the rotating ring. The grooves are aligned with the embedding grooves, and the mounting ring is movably installed in the annular groove.

[0010] More preferably, the fixing block has a rod groove inside, and a spring is provided inside the rod groove.

[0011] More preferably, a guide rod is fixedly installed on the upper rear surface of the scraper, and a stop block is fixedly installed on the rear surface of the guide rod.

[0012] More preferably, the rear end of the guide rod is embedded in the rod groove, the height of the scraper is greater than the height of the mounting groove, and the rear surface of the scraper is in contact with the inner surface of the mounting groove.

[0013] Compared with the prior art, this utility model proposes a novel focus switching device, which has the following characteristics:

[0014] Beneficial effects:

[0015] In this invention, by setting up a mounting bracket, a rotating ring, a fixing block, and a scraper in cooperation, when it is necessary to clean the inside of the mounting groove, since the reducing lens is removed from the mounting groove, the scraper will move into the mounting groove under the pushing action of the spring. At this time, when the rotating ring is rotated, the scraper can be used to scrape the inner surface of the mounting groove, thereby conveniently completing the cleaning work. Attached Figure Description

[0016] Figure 1 This is an overall structural diagram of a novel focal length switching device according to the present invention;

[0017] Figure 2 This is a structural diagram of the mounting frame for a novel focal length switching device according to this utility model;

[0018] Figure 3 This is a partial cross-sectional view of the rotating ring of a novel focal length switching device according to this utility model;

[0019] Figure 4 This is a partial cross-sectional view of the fixed block and scraper strip of a novel focal length switching device according to this utility model.

[0020] In the diagram: 1. Mounting bracket; 101. Mounting groove; 102. Embedding groove; 103. Annular groove; 104. Through hole; 2. Rotating ring; 201. Mounting ring; 202. Groove; 3. Fixing block; 301. Rod groove; 302. Spring; 4. Scraper; 401. Guide rod; 402. Stop block. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical applications of the present invention, and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for a particular purpose.

[0022] like Figure 1-4As shown, a novel focal length switching device includes a mounting frame 1, a rotating ring 2, a fixing block 3, and a scraper 4. The rotating ring 2 is movably mounted on the upper surface of the mounting frame 1, and the fixing blocks 3 are fixedly mounted on the upper surfaces of both sides of the rotating ring 2. The scraper 4 is movably mounted on the front end of the fixing block 3.

[0023] Furthermore, the upper surface of the mounting bracket 1 is provided with a mounting groove 101, the lower inner surface of the mounting groove 101 is provided with a through hole 104, the inner two side surfaces of the mounting groove 101 are provided with embedding grooves 102 longitudinally, and the upper surface of the mounting bracket 1 and the periphery of the mounting groove 101 are provided with an annular groove 103; the cooperation between the annular groove 103 and the mounting ring 201 can make the rotating ring 2 remain stable when rotating. When the reducing lens is installed into the mounting groove 101, the scraper 4 will be squeezed and embedded in the embedding groove 102.

[0024] Furthermore, there are three mounting slots 101, and the diameter of the through hole 104 is smaller than the diameter of the mounting slot 101. The three mounting slots 101 are distributed in a triangular pattern on the upper surface of the mounting bracket 1.

[0025] Furthermore, an mounting ring 201 is fixedly installed on the lower surface of the rotating ring 2, and grooves 202 are formed on both inner sides of the rotating ring 2. The grooves 202 are aligned with the embedding groove 102, and the mounting ring 201 is movably installed in the annular groove 103.

[0026] Furthermore, the fixing block 3 has a rod groove 301 inside, and a spring 302 is provided inside the rod groove 301; the spring 302 pushes the stop block 402 forward, so that the scraper 4 can be located inside the mounting groove 101 without external pressure.

[0027] Furthermore, a guide rod 401 is fixedly installed on the upper rear surface of the scraper 4, and a stop block 402 is fixedly installed on the rear surface of the guide rod 401; the scraper 4 can scrape the inner surface of the mounting groove 101, thereby facilitating the cleaning of the mounting groove 101.

[0028] Furthermore, the rear end of the guide rod 401 is embedded in the rod groove 301, the height of the scraper 4 is greater than the height of the mounting groove 101, and the rear surface of the scraper 4 is in contact with the inner surface of the mounting groove 101.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A novel focus switching device, characterized in that: It includes a mounting frame (1), a rotating ring (2), a fixing block (3) and a scraper (4). The rotating ring (2) is movably mounted on the upper surface of the mounting frame (1), and the fixing blocks (3) are fixedly mounted on the upper surfaces of both sides of the rotating ring (2). The scraper (4) is movably mounted on the front end of the fixing block (3).

2. The novel focal length switching device according to claim 1, characterized in that: The mounting bracket (1) has a mounting groove (101) on its upper surface, a through hole (104) on its lower inner surface, and embedding grooves (102) on both inner sides of the mounting groove (101) in the longitudinal direction. The mounting bracket (1) has an annular groove (103) on its upper surface and around the mounting groove (101).

3. The novel focal length switching device according to claim 2, characterized in that: The number of mounting slots (101) is three, the diameter of the through hole (104) is smaller than the diameter of the mounting slot (101), and the three mounting slots (101) are distributed in a triangular pattern on the upper surface of the mounting bracket (1).

4. A novel focal length switching device according to claim 3, characterized in that: The lower surface of the rotating ring (2) is fixedly mounted with an installation ring (201). The inner two sides of the rotating ring (2) are provided with grooves (202). The grooves (202) are aligned with the embedding groove (102). The installation ring (201) is movably mounted in the annular groove (103).

5. A novel focal length switching device according to claim 4, characterized in that: The fixing block (3) has a rod groove (301) inside, and a spring (302) is provided inside the rod groove (301).

6. A novel focal length switching device according to claim 5, characterized in that: A guide rod (401) is fixedly installed on the upper rear surface of the scraper (4), and a stop block (402) is fixedly installed on the rear surface of the guide rod (401).

7. A novel focal length switching device according to claim 6, characterized in that: The rear end of the guide rod (401) is embedded in the rod groove (301), the height of the scraper (4) is greater than the height of the mounting groove (101), and the rear surface of the scraper (4) is in contact with the inner surface of the mounting groove (101).

Images