Parallax corrector for viewfinder

Abstract

The utility model discloses a kind of parallax correctors, comprising: first shell, lens assembly and second shell;First shell and second shell are detachably connected, and lens assembly is placed at connecting place;The included angle of the two side walls in vertical direction of first shell and lens assembly is less than the included angle of the two side walls in vertical direction of second shell and lens assembly;The included angle of the two side walls in horizontal direction of first shell and lens assembly is less than the included angle of the two side walls in horizontal direction of second shell and lens assembly;And the ratio of the length of first shell and the length of second shell is 2.29:1 to 2.32:1.This application is by setting the length of the first shell and the second shell of viewfinder and the included angle between lens assembly, to overcome the problem that the picture actually photographed and the picture observed of traditional paraxial viewfinder type camera exist deviation.

Description

Technical Field

[0001] This utility model relates to the field of imaging equipment technology, and in particular to a parallax correction viewfinder. Background Technology

[0002] An optical viewfinder is a system where the human eye observes the field of view and composes a shot through a set of optical mechanisms on a camera. Optical viewfinders include two types: rangefinder-style (viewfinder-level) and single-lens reflex (SLR) coaxial viewfinders. In consumer-grade digital cameras, the rangefinder-style (viewfinder-level) is the most common and prevalent.

[0003] However, because the viewfinder and lens of a rangefinder camera are not aligned but separate, the image seen in the viewfinder differs in size and position from the actual captured digital image. This difference is called parallax in photography. This parallax is not a major problem when shooting distant scenes, but it often leads to strange issues when shooting close-ups, such as discrepancies between the framing and the final image angle, resulting in incorrect composition. From a photographic perspective, this is detrimental to proper framing and composition.

[0004] Therefore, this application aims to provide an optical viewfinder that can overcome parallax. Utility Model Content

[0005] To address the shortcomings of the existing technology, this invention proposes a parallax correction viewfinder to solve the aforementioned technical problems.

[0006] This application proposes a parallax-corrected viewfinder, comprising:

[0007] First housing, lens assembly, and second housing;

[0008] The first housing and the second housing are detachably connected, and a lens assembly is placed at the connection point;

[0009] The angle between the two vertical side walls of the first housing and the lens assembly is smaller than the angle between the two vertical side walls of the second housing and the lens assembly.

[0010] The angle between the two side walls of the first housing in the horizontal direction and the lens assembly is smaller than the angle between the two side walls of the second housing and the lens assembly in the horizontal direction.

[0011] The ratio of the length of the first shell to the length of the second shell is 2.29:1 to 2.32:1.

[0012] By controlling the angle difference between the first and second housings in the vertical and horizontal directions, the field of view can be precisely adjusted, aligning the field of view with the lens imaging angle. Furthermore, the length ratio of 2.29:1 to 2.32:1 optimizes the light propagation path, ensuring that the perspective relationship between the viewfinder image of objects at different distances and the final image is consistent, thus avoiding the composition problem of "seeing but not being able to capture".

[0013] Specifically, at least one side wall of the first housing is provided with a first limiting protrusion in the vertical direction; when the first housing and the second housing are engaged, the first limiting protrusion abuts against the second housing.

[0014] Through the above-mentioned technical means, when the first housing and the second housing are assembled, the presence of the first limiting protrusion prevents the first housing from being inserted too deeply into the second housing due to improper installation, thereby avoiding damage to the lens assembly.

[0015] Specifically, a second limiting protrusion corresponding to the first limiting protrusion is provided on the side wall of the second housing.

[0016] Specifically, the first housing and the second housing have a first recess at one end for accommodating the lens assembly, and the second housing and the first housing have a corresponding second recess at one end.

[0017] Through the above technical solution, the first and second recesses provide dedicated installation space for the lens assembly, avoiding changes in the light propagation path caused by lens offset or tilt.

[0018] Specifically, the first and second recesses have the same depth, which is half the thickness of the lens assembly.

[0019] In the above technical solution, the recess depth is 1 / 2 of the thickness of the lens assembly, which can make the lens completely centered, ensure that the perpendicular incidence and refraction path of light meet the design expectations, avoid the field of view shift caused by lens eccentricity, ensure the matching accuracy of the framing range and imaging angle, and further reduce composition deviation.

[0020] Specifically, the included angle between the two inner walls of the first shell in the vertical section is 16°±5%.

[0021] Specifically, the included angle between the two inner sidewalls of the first shell in the horizontal section is 15° ± 5%.

[0022] Specifically, the included angle between the two inner walls of the second shell on the vertical section is 40°±5%.

[0023] Specifically, the included angle between the two inner sidewalls of the second shell in the horizontal section is 36°±5%.

[0024] By precisely controlling the angle, we ensure that the horizontal and vertical framing range is consistent with the image.

[0025] Specifically, a first protective frame and a second protective frame are respectively provided at the ends of the first housing and the second housing away from the lens assembly;

[0026] The angle between the first protective frame and the lens assembly is greater than the angle between the second protective frame and the lens assembly;

[0027] Furthermore, the ratio of the angle between the first protective frame and the lens assembly to the angle between the second protective frame and the lens assembly is equal to the ratio of the angle between the two side walls of the second housing in the vertical direction and the lens assembly to the angle between the two side walls of the first housing in the vertical direction and the lens assembly.

[0028] Compared with the prior art, the beneficial effects of this application are as follows:

[0029] (1) The first and second shells are set with different included angles in both the horizontal and vertical directions, and are quantified into precise parameters such as 16°±5% and 15°±5% to achieve full-dimensional precise matching of the field of view; on the other hand, the shell length ratio of 2.29:1-2.32:1 optimizes the light propagation path to ensure that the perspective relationship of objects at different distances is consistent with the imaging.

[0030] (2) The bidirectional cooperation of the first and second limiting protrusions greatly improves the coaxiality of the housing connection and avoids relative displacement of the housing; the exclusive first and second recesses and the equal depth design of 1 / 2 lens thickness can accurately center and fix the lens to prevent the lens from tilting or shifting. Attached Figure Description

[0031] The accompanying drawings are included to provide a further understanding of the embodiments and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments and, together with the description, serve to explain the principles of the present invention. Other embodiments and many anticipated advantages of the embodiments will be readily recognized as they become better understood through reference to the following detailed description. Other features, objects, and advantages of this application will become more apparent from reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0032] Figure 1 This is an exploded viewfinder structure for parallax correction according to an embodiment of this application;

[0033] Figure 2 This is a schematic diagram of the structure of the second housing according to a specific embodiment of this application;

[0034] Figure 3 This is a schematic diagram of the structure of the first housing according to a specific embodiment of this application;

[0035] Figure 4 This is a schematic cross-sectional view (AA) according to a specific embodiment of this application;

[0036] Figure 5This is a schematic cross-sectional view of BB according to a specific embodiment of this application;

[0037] Figure 6 This is a CC cross-sectional schematic diagram according to a specific embodiment of this application;

[0038] Figure 7 This is a schematic cross-sectional view of DD according to a specific embodiment of this application;

[0039] Figure 8 This is a schematic cross-sectional view of an EE according to a specific embodiment of this application.

[0040] The meaning of each number in the diagram:

[0041] 1. Second housing; 2. Lens assembly; 3. First housing; 1a. Second limiting protrusion; 1b. Second recess; 1c. Second protective frame; 3a. First limiting protrusion; 3b. First recess; 3c. First protective frame. Detailed Implementation

[0042] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the relevant utility model and not intended to limit the scope of the utility model. Furthermore, it should be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings.

[0043] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0044] This application proposes a parallax-corrected viewfinder. Figure 1 An exploded viewfinder structure for parallax correction according to an embodiment of this application is shown. Figure 2 This is a schematic diagram of the structure of the second housing according to a specific embodiment of this application. Figure 3 This is a schematic diagram of the structure of the first housing according to a specific embodiment of this application, as shown below. Figure 1-3 As shown, the viewfinder includes:

[0045] A parallax-corrected viewfinder is provided to solve the aforementioned technical problems.

[0046] This application proposes a parallax-corrected viewfinder, comprising:

[0047] First housing 3, lens assembly 2, and second housing 1;

[0048] The first housing 3 and the second housing 1 are detachably connected, and a lens assembly 2 is placed at the connection point;

[0049] The angle between the two vertical side walls of the first housing 3 and the lens assembly 2 is smaller than the angle between the two vertical side walls of the second housing 1 and the lens assembly 2.

[0050] The angle between the two side walls of the first housing 3 in the horizontal direction and the lens assembly 2 is smaller than the angle between the two side walls of the second housing 1 in the horizontal direction and the lens assembly 2.

[0051] The ratio of the length of the first shell 3 to the length of the second shell 1 is 2.29:1 to 2.32:1.

[0052] By controlling the angle difference between the first housing 3 and the second housing 1 in the vertical and horizontal directions, the field of view can be precisely adjusted so that the field of view during framing is aligned with the lens imaging angle; and the length ratio of 2.29:1 to 2.32:1 optimizes the light propagation path, ensuring that the perspective relationship between the framing image of objects at different distances and the final image is consistent, avoiding the composition problem of "seeing but not being able to capture".

[0053] Specifically, at least one side wall of the first housing 3 in the vertical direction is provided with a first limiting protrusion 3a; when the first housing 3 and the second housing 1 are engaged, the first limiting protrusion 3a abuts against the second housing 1.

[0054] Through the above-mentioned technical means, when the first housing 3 and the second housing 1 are assembled, the presence of the first limiting protrusion 3a prevents the first housing 3 from being inserted too deeply into the second housing 1 due to improper installation, thereby avoiding damage to the lens assembly 2.

[0055] Specifically, the second housing 1 has a second limiting protrusion 1a corresponding to the first limiting protrusion 3a on its side wall.

[0056] Specifically, the first housing 3 and the second housing 1 have a first recess 3b at one end for accommodating the lens assembly 2, and the second housing 1 and the first housing 3 have a corresponding second recess 1b at one end.

[0057] Through the above technical solution, the first recess 3b and the second recess 1b provide dedicated installation space for the lens assembly 2, avoiding changes in the light propagation path caused by lens offset or tilt.

[0058] Specifically, the first recess 3b and the second recess 1b have the same depth, which is half the thickness of the lens assembly 2.

[0059] In the above technical solution, the recess depth is half the thickness of the lens assembly 2, which can make the lens completely centered, ensure that the perpendicular incidence and refraction path of light meet the design expectations, avoid the field of view shift caused by lens eccentricity, ensure the matching accuracy of the framing range and imaging angle, and further reduce composition deviation.

[0060] By precisely controlling the angle, we ensure that the horizontal and vertical framing range is consistent with the image.

[0061] Specifically, a first protective frame and a second protective frame 1c are respectively provided at the ends of the first housing 3 and the second housing 1 away from the lens assembly 2;

[0062] The angle between the first protective frame and the lens assembly 2 is greater than the angle between the second protective frame 1c and the lens assembly 2;

[0063] Furthermore, the ratio of the angle between the first protective frame and the lens assembly 2 to the angle between the second protective frame 1c and the lens assembly 2 is equal to the ratio of the angle between the two side walls of the second housing 1 in the vertical direction and the lens assembly 2 to the angle between the two side walls of the first housing 3 in the vertical direction and the lens assembly 2.

[0064] In a specific embodiment, such as Figure 4 As shown in the figure, a cross-sectional view of the first housing along the AA direction is shown. In this embodiment, the angle between the upper inner surface of the first housing and the lens assembly in the vertical direction is ∠D, the angle between the lower inner surface of the first housing and the lens assembly is ∠E, and the angle between the two inner sidewalls of the first housing in the vertical direction is ∠F.

[0065] like Figure 5 As shown in the figure, a cross-sectional view of the first housing along the BB direction is shown. The angle between the inner left end face of the first housing and the lens assembly in the horizontal direction is ∠B, the angle between the inner right end face and the lens assembly is ∠A, and the angle between the two inner sidewalls of the first housing in the horizontal direction is ∠C.

[0066] like Figure 6 As shown in the figure, a cross-sectional view of the second housing in the CC direction is shown. The angle between the inner left end face of the second housing and the lens assembly in the horizontal direction is ∠G, the angle between the inner right end face and the lens assembly is ∠H, and the angle between the two inner sidewalls of the second housing in the horizontal direction is ∠I.

[0067] like Figure 7 As shown in the figure, a cross-sectional view of the second housing in the DD direction is shown. The angle between the upper inner surface of the first housing in the vertical direction and the lens assembly is ∠J, the angle between the lower inner surface of the first housing and the lens assembly is ∠K, and the angle between the two inner sidewalls of the first housing in the vertical direction is ∠L.

[0068] like Figure 8 As shown in the figure, a cross-sectional view of the viewfinder along the EE direction is presented. The angle between the first protective frame and the lens assembly is ∠N, the angle between the second protective frame and the lens assembly is ∠O, and the distance from the first protective frame to the lens assembly is Q, and the distance from the second protective frame to the lens assembly is P.

[0069] By defining the aforementioned angles and distances, an optical path structure that meets specific requirements can be formed.

[0070] In a more specific embodiment

[0071] ∠A=96.64°, ∠B=98.48°, ∠C=15.12°, ∠D=97.46°, ∠E=99.13°, ∠F=16.59°, ∠G=106.85°, ∠H=109.23 °, ∠I=36.08°, ∠J=109.49°, ∠K=110.85°, ∠L=40.34°, ∠M=168°, ∠N=6.30°, ∠O=6.11°, P:Q=2.30:1;

[0072] Based on the design of this embodiment, compared with the traditional rangefinder viewfinder which adopts a through-hole structure, because the lower edge of the first housing is tilted downward at a certain angle (i.e., ∠E) and the upper edge is tilted upward at a certain angle (i.e., ∠D), the vertical viewing angle observed by the user through the second housing will increase by 9° downward and 7° upward. Similarly, the horizontal viewing angle will also increase by a certain angle. As a result, the image observed by the user through the second housing is 10% larger than the image observed by the through-hole viewfinder.

[0073] In addition, the embodiments available for reference also include:

[0074] Table 1

[0075] ∠A 96.64° 93.20° 99.50° 100.80° 92.50° ∠B 98.48° 102.10° 94.80° 99.90° 103.00° ∠C 15.12° 14.50° 15.80° 14.30° 15.60° ∠D 97.46° 93.80° 101.20° 96.10° 102.00° ∠E 99.13° 103.50° 95.30° 100.50° 94.80° ∠F 16.59° 15.80° 17.30° 16.10° 17.10° ∠G 106.85° 102.50° 111.50° 108.20° 112.00° ∠H 109.23° 114.00° 105.50° 110.80° 104.80° ∠I 36.08° 34.50° 37.80° 35.20° 38.00° ∠J 109.49° 114.20° 105.10° 110.50° 104.50° ∠K 110.85° 115.50° 106.20° 112.00° 105.80° ∠L 40.34° 38.50° 42.00° 39.20° 42.30° ∠M 168° 160.50° 175.00° 163.00° 174.50° ∠N 6.30° 6.00° 6.60° 5.90° 6.50° ∠O 6.11° 5.80° 6.40° 5.70° 6.30° P:Q 2.30：1 2.20：1 2.40：1 2.25：1 2.38：1 Image enhancement 1.1 1.08 1.08 1.11 1.13

[0076] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described utility model concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A parallax-corrected viewfinder, characterized in that, include: First housing, lens assembly, and second housing; The first housing and the second housing are detachably connected, and the lens assembly is placed at the connection point; The angle between the two side walls of the first housing in the vertical direction and the lens assembly is smaller than the angle between the two side walls of the second housing in the vertical direction and the lens assembly. The angle between the two side walls of the first housing in the horizontal direction and the lens assembly is smaller than the angle between the two side walls of the second housing in the horizontal direction and the lens assembly; The ratio of the length of the first shell to the length of the second shell is 2.29:1 to 2.32:

1.

2. The viewfinder according to claim 1, characterized in that, The first housing has a first limiting protrusion on at least one side wall in the vertical direction; when the first housing and the second housing are engaged, the first limiting protrusion abuts against the second housing.

3. The viewfinder according to claim 2, characterized in that, The second housing sidewall is provided with a second limiting protrusion corresponding to the first limiting protrusion.

4. The viewfinder according to claim 1, characterized in that, The first housing and the second housing have a first recess at one end for accommodating the lens assembly, and the second housing and the first housing have a corresponding second recess at one end.

5. The viewfinder according to claim 4, characterized in that, The first and second recesses have the same depth, which is half the thickness of the lens assembly.

6. The viewfinder according to claim 1, characterized in that, The included angle between the two inner walls of the first shell in the vertical section is 16°±5%.

7. The viewfinder according to claim 1, characterized in that, The included angle between the two inner sidewalls of the first shell in the horizontal cross section is 15° ± 5%.

8. The viewfinder according to claim 1, characterized in that, The included angle between the two inner walls of the second shell in the vertical section is 40° ± 5%.

9. The viewfinder according to claim 1, characterized in that, The included angle between the two inner walls of the second shell in the horizontal section is 36°±5%.

10. The viewfinder according to claim 1, characterized in that, The first housing and the second housing are respectively provided with a first protective frame and a second protective frame at the ends away from the lens assembly; The angle between the first protective frame and the lens assembly is greater than the angle between the second protective frame and the lens assembly; Furthermore, the ratio of the angle between the first protective frame and the lens assembly to the angle between the second protective frame and the lens assembly is equal to the ratio of the angle between the two side walls of the second housing in the vertical direction and the lens assembly to the angle between the two side walls of the first housing in the vertical direction and the lens assembly.

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