Camera capable of greatly and randomly switching pictures in film

By designing the film back structure, arbitrary switching of the image format within the same roll of 120 film was achieved, solving the problem that traditional film cameras could not switch image formats significantly, and providing a simple and stable image format switching solution.

CN224081927UActive Publication Date: 2026-04-03ZHONGSHAN SANHE FILM & TELEVISION EQUIP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-04-09
Publication Date
2026-04-03

AI Technical Summary

Technical Problem

Traditional film cameras cannot arbitrarily switch between image formats on the same roll of 120 film, and existing shutters have limited switching options and poor compatibility.

Method used

A film back structure was designed, including a back body and a front cover, which are hinged by a pivot. It is equipped with a film chamber, a film spool, a film advance spool, a black light shield and an observation slit, and is equipped with film advance indicator scales to achieve arbitrary switching of image format.

Benefits of technology

It allows for arbitrary switching between 6×1cm and 6×18cm image formats on the same roll of 120 film. Its simple and stable structure meets the needs of a wide range of film photography enthusiasts.

✦ Generated by Eureka AI based on patent content.

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    Figure CN224081927U_ABST
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Abstract

The camera mainly comprises a film back and a camera body, the film back comprises a back main body and a back front cover, the left end and the right end of the back main body are provided with film cabins, the film cabins are internally provided with film shafts, the outer sides of the film shafts are provided with film rotating shafts, and the film rotating shafts are provided with film rotating shafts. A black shading sheet is arranged in the back front cover, the two ends of the black shading sheet extend to the outer side of the back front cover, an observation seam penetrating through a shooting area is formed in the middle of the back main body, and sheet passing indication scales are arranged on the edge of the observation seam of the back main body. When the picture passing sheet needs to be switched, only the scale corresponding to the previous shot picture needs to be found on the left side, the marking pen is used for dotting and marking at the changed position, then the sheet shaft passing sheet is rotated to enable the marking point to move to be aligned with the scale corresponding to the next picture on the right side, and finally the black shading sheets on the left side and the right side are adjusted to the scale position of the next shot picture. And the next picture can be shot after being fixed.
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Description

Technical Field

[0001] This utility model belongs to the field of photographic equipment technology, specifically relating to a camera that allows for large-scale arbitrary switching of image frames in film. Background Technology

[0002] Traditionally, most film cameras that use 120 film to shoot medium format negatives can only shoot photos of the same format size on 120 film. If it is necessary to switch formats, the entire film back must be replaced. In addition, a small number of existing film backs can switch formats at the same time by using a simple stop, but the number of format switching stops is very limited, and the compatibility between backs of different formats is poor.

[0003] Currently, there is no film back that allows for significant format switching within the same roll of 120 film. Therefore, film photography enthusiasts need a feature-rich and simple 120 film camera that can switch between formats within the same roll. Utility Model Content

[0004] The purpose of this invention is to provide a 120 film camera with a simple and stable structure, which can switch the image format at any position on the same roll of 120 film (from 6×1cm to 6×18cm at any time) and can realize tilt-shift operation.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a camera that allows for large-scale arbitrary switching of image frames in film, mainly comprising a film back and a camera body. The film back includes a back body and a front cover. One end of the back body and one end of the front cover are hinged together by a pivot. Film compartments are provided at both ends of the back body, and a film spool is provided in the film compartment. A film advance pivot is provided on the outside of the film spool. A black light-blocking plate is provided in the front cover, and both ends of the black light-blocking plate extend to the outside of the front cover. An observation slit is provided in the middle of the back body, penetrating the shooting area. Film advance indicator scales are provided on the edge of the observation slit of the back body.

[0006] Furthermore, the side walls on both sides of the rear front cover form sliding grooves for black light-shielding sheets, which are located in the sliding grooves and move along the sliding grooves.

[0007] Furthermore, the camera body includes a lens assembly and a pig snout. One end of the lens assembly is located in the pig snout, and the outside of the pig snout is screwed together via a lens knob.

[0008] Furthermore, the pig snout is located on the surface of the back cover and is connected to it by a screw thread via a pig snout knob.

[0009] Furthermore, a locking part is provided on one side of the back panel, which includes a locking pin and a lever. One end of the locking pin is connected to the lever. A buckle is provided on one side of the front cover of the back panel. The buckle is inserted into the locking part and engages with the locking pin to complete the locking. The lock is opened and closed by moving the lever to move the locking pin.

[0010] Furthermore, handles are provided on both sides of the back cover.

[0011] The present invention has the following advantages: The back panel is provided with film advance indicator scales on the edge of the observation slit. When it is necessary to switch the frame size, simply find the scale corresponding to the previous frame size on the left side, mark the position with a marker, rotate the film shaft to advance the film, and move the marked point to align with the scale corresponding to the next frame size on the right side. Finally, adjust the black light shields on the left and right sides to the position of the next frame size scale, and fix them in place before taking the next picture. Attached Figure Description

[0012] Figure 1 This is the front view of the present invention;

[0013] Figure 2 This is a schematic diagram of the unfolded structure between the main body of the back and the front cover of the back of this utility model.

[0014] Figure 3 This is a cross-sectional view of the present invention.

[0015] Figure 4 A schematic diagram showing an observation slit and indicator scale in the back panel of this utility model;

[0016] Figure 5 This is a schematic diagram of the structure of the black light-shielding sheet of this utility model disposed in the sliding groove;

[0017] Figure 6 This is a schematic diagram of the connection structure between the latch and the locking part of this utility model.

[0018] Reference numerals: Film back 10; Camera body 20; Back body 30; Front cover 40; Film compartment 31; Film spool 32; Film advance spool 33; Black light shield 41; Sliding groove 42; Observation slit 34; Indicator scale 35; Lens group 21; Snooze 22; Lens knob 23; Snooze knob 24; Locking part 50; Lock pin 51; Pull tab 52; Locking buckle 43; Handle 36. Detailed Implementation

[0019] like Figures 1 to 6As shown, a camera that allows for large-scale arbitrary switching of image frames in film mainly includes a film back 10 and a camera body 20. The film back 10 is located on the back of the camera body 20. The film back 10 includes a back body 30 and a back front cover 40. One end of the back body 30 and one end of the back front cover 40 are hinged by a pivot. Film compartments 31 are provided at the left and right ends of the back body 30. A film spool 32 is provided in the film compartment 31. A film advance pivot 33 is provided on the outside of the film spool 32. Manually rotating the film advance pivot 33 provides the power for film advance.

[0020] The back cover 40 is provided with a black light shield 41. The two ends of the black light shield 41 extend to the outer side of the back cover 40. When in use, the black light shield 41 can be dragged on both sides to adjust the light blocking range.

[0021] In practice, the side walls on both sides of the back cover 40 form sliding grooves 42 for black light-shielding sheets 41. The black light-shielding sheets 41 are located in the sliding grooves 42 and move along the sliding grooves 42.

[0022] The back body 30 has an observation slit 34 in the middle that runs through the shooting area. In practice, the 120 film comes with an opaque backing paper, so the slit on the back will not affect the photosensitive film.

[0023] The back panel 30 has film advance indicator scales 35 along the edge of the observation slit 34. When switching the frame size, simply find the scale corresponding to the previous frame size on the left side, mark the position with a marker, rotate the film shaft 32 to advance the film, and move the marked point to align with the scale corresponding to the next frame size on the right side. Finally, adjust the black light shields 41 on both sides to the position of the next frame size scale, and then take the next picture.

[0024] The camera body 20 includes a lens assembly 21 and a snout 22. One end of the lens assembly 21 is located in the snout 22. The snout 22 is screwed to the outside of the lens assembly 21 via a lens knob 23. The snout 22 is located on the surface of the back cover 40 and is screwed to the snout via a snout knob 24.

[0025] The back panel 30 has a locking part 50 on one side, which has a locking pin 51 and a pull tab 52. One end of the locking pin 51 is connected to the pull tab 52. The back front cover 40 has a buckle 43 on one side. The buckle 43 is inserted into the locking part 50 and engages with the locking pin 51 to complete the locking. The lock is opened and closed by moving the pull tab 52 to move the locking pin 51.

[0026] The front cover 40 of the back has handles 36 on both sides, which make it easy to carry the camera when in use.

Claims

1. 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The camera of claim 1, wherein, ​ 3. The camera of claim 2, wherein, ​ 4. The camera of claim 3, wherein, ​ 5. The camera of claim 4, wherein, ​ 6. The camera of claim 5, wherein, ​