JP3792415B2 - Viewfinder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a viewfinder used as a monitor of a video camera or the like.
[0002]
[Prior art]
FIG. 1 is an external view of a viewfinder, (a) is a front view, (b) is a plan view, and (c) is a left side view. Reference numeral 1 denotes an image enlarging lens body, and 2 a viewfinder main body, each of which is detachably attached.
[0003]
A mounting structure between the image enlarging lens body and the viewfinder main body will be described with reference to the drawings. 2A and 2B are diagrams showing a conventional image enlarging lens body, in which FIG. 2A is a front view and FIG. 2B is a right side view. FIG. 3 is a perspective view showing a mounting portion of the viewfinder main body. FIG. 4 is an assembled view of the image enlarging lens body and the viewfinder main body.
[0004]
A protrusion 3 is formed on the inner periphery of the attachment portion of the image enlargement lens body 1, and a guide groove 4 for guiding the protrusion 3 formed on the image enlargement lens body 1 in the axial direction is formed on the attachment portion of the viewfinder body 2. A fixed groove 5 extending in the circumferential direction that is continuous with the guide groove 4 is formed. A through groove 6 communicating with the fixing groove 5 and extending in the circumferential direction and penetrating through the thickness of the viewfinder main body attachment portion is provided, and the crosspiece 7 is formed by the through groove 6 and the end portion in the axial direction of the viewfinder main body attachment portion. Further, a protrusion 8 is formed to protrude toward the center fixing groove side of the crosspiece 7.
[0005]
The projection 3 on the attachment portion of the image enlarging lens body 1 and the axial guide groove 4 formed on the attachment portion of the viewfinder main body 2 are inserted together and formed continuously in the circumferential direction with the axial guide groove 4. By rotating along the fixing groove 5, as shown in FIG. 4, the protrusion 3 on the image magnifying lens body mounting portion is fixed by the protrusion 8 on the mounting portion of the viewfinder main body 1. When rotating, the projection 3 of the lens body pushes the projection 8 of the viewfinder mounting portion in the axial direction and passes through and fixes the projection 7. The through-groove 6 that penetrates the thickness of the viewfinder body attachment portion enables rotation while being bent.
[0006]
[Problems to be solved by the invention]
The mounting and fixing of the image magnifying lens body and the viewfinder main body having the above-described configuration is performed only by the protrusion provided on the fixing groove side of the crosspiece, and the fitting force is concentrated on the protrusion. For this reason, every time the lens body for image enlargement and the viewfinder main body formed of resin are repeatedly attached and detached, the protrusions provided on both are shaved off. The shavings generated thereby enter the lens body for image enlargement and the inside of the viewfinder main body through the through groove provided in the viewfinder mounting portion, and adhere to the lens of the lens body and the display surface of the viewfinder main body. This makes it difficult to view the video.
[0007]
Further, since the protrusions are scraped, the fitting force at the time of attachment / detachment is lost, and the attachment / fixing force between the image enlarging lens body and the viewfinder main body is reduced.
[0008]
The present invention provides a viewfinder having a structure that eliminates the occurrence of shavings of projections due to the attachment / detachment of an image enlarging lens body and a viewfinder body, and can secure a fitting force at the time of attachment / detachment.
[0009]
[Means for Solving the Problems]
In a viewfinder in which a cylindrical attachment portion of an image enlargement lens body is inserted into an attachment portion provided in the viewfinder main body, and an image enlargement lens body is detachably attached to the viewfinder main body, the image enlargement lens body is attached to the viewfinder Has a projection, and the viewfinder main body has a guide groove for guiding the projection of the image enlarging lens body in the axial direction and a fixed groove that communicates with the guide groove and extends in the circumferential direction. A through-groove extending in the circumferential direction and penetrating through the thickness of the viewfinder main body attachment portion, and forming a crosspiece with the through groove and the axial end of the viewfinder main body attachment portion. The fixed groove side has a smooth R shape, and a protrusion is formed on a part of the fixed groove, and the protrusion of the lens body mounting portion presses the protrusion of the R shape portion of the crosspiece and the fixed groove. Pier Extruded in the axial direction and the radial direction while flexed, image enlarging lens body is mounted on the viewfinder body through the projections of the fixing groove and R-shaped portion of the bar, the projection of the lens body mounting portion The object is fixed by the protrusions of the R-shaped part and the fixing groove .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 5 is a perspective view showing a mounting portion of the viewfinder main body according to the embodiment of the present invention. FIG. 6 is an enlarged view of a mounting portion of the viewfinder body of the present invention. The viewfinder main body 9 has a guide groove 10 that guides the projection of the lens body for image enlargement (similar to the conventional example) in the axial direction and a fixing groove 11 that communicates with the guide groove 10 and extends in the circumferential direction. A through groove 12 that communicates with the groove 11 and extends in the circumferential direction and penetrates the attachment portion thickness of the viewfinder main body 9 is provided, and the through groove 12 and the axial end of the attachment portion of the viewfinder main body 9 are provided. A crosspiece 13 is formed. The crosspiece 13 has an R-shaped portion 13a that is slightly swollen on the fixed groove 11 side. Further, a protrusion 14 protruding in the radial direction is formed in a part of the fixed groove. The protrusions of the image enlarging lens body attachment portion are inserted in alignment with the axial guide grooves 10 formed in the attachment portion of the viewfinder body 9, and the R-shaped portion 13 a of the crosspiece 13 and the protrusions 14 of the fixing groove 11 are inserted. Is pushed out in the axial direction and the radial direction while bending the crosspiece 13, and passes through the R-shaped portion 13a of the crosspiece 13 and the projection 14 of the fixing groove 11 to enlarge the image to the viewfinder main body 9. A lens body is attached and fixed. As in the above configuration, the R-shaped portion 13a can be formed smoothly because the pressing portion has two portions of the R-shaped portion 13a of the crosspiece and the protrusion 14 of the fixing groove, and the protrusion 14 of the fixing groove has its height. Can be lowered, and the fitting force at the time of attachment and detachment can be dispersed. Therefore, it is not necessary to concentrate the fitting force at the time of attachment / detachment at one place, so that the generation of scraps from the protrusions can be suppressed. Further, the fitting force can be sufficiently ensured by pressing in the axial direction by the R-shaped portion 13a of the crosspiece and pressing in the radial direction by the protrusion 14 of the fixing groove.
[0011]
【The invention's effect】
By making the pressing part into two places, the R-shaped part of the crosspiece and the protrusion of the fixed groove, the R-shaped part can be formed smoothly, and the height of the protrusion of the fixed groove can be lowered, The fitting force can be dispersed. Therefore, since the fitting force at the time of attachment / detachment is not concentrated in one place, the generation of scraped scraps can be suppressed. Further, the fitting force can be sufficiently ensured by pressing in the axial direction by the R-shaped portion of the crosspiece and by pressing in the radial direction by the protrusion of the fixing groove.
[0012]
Since the shape of the fixed groove side of the crosspiece formed in the viewfinder main body attachment portion is a smooth R shape, the projection of the lens body for image enlargement, the guide groove, and the fixed groove are smoothly fitted.
[Brief description of the drawings]
1A and 1B are external views of a viewfinder, where FIG. 1A is a front view, FIG. 1B is a plan view, and FIG. 1C is a left side view.
2A and 2B are diagrams illustrating a conventional image enlargement lens body, in which FIG. 2A is a front view, and FIG. 2B is a right side view;
FIG. 3 is a perspective view showing a mounting portion of a viewfinder main body.
FIG. 4 is a combination diagram of an image enlarging lens body and a viewfinder main body.
FIG. 5 is a perspective view showing an attachment portion of a viewfinder main body according to an embodiment of the present invention.
FIG. 6 is an enlarged view of a mounting portion of the viewfinder main body of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Image magnifying lens body 2 Viewfinder main body 3 Protrusion 4 Guide groove 5 Fixing groove 6 Through groove 7 Crosspiece 8 Protrusion 9 Viewfinder main body 10 Guide groove 11 Fixed groove 12 Through groove 13 Crosspiece 13a R shape part 14 Protrusion

Claims (1)

In a viewfinder in which a cylindrical attachment portion of an image enlargement lens body is inserted into an attachment portion provided in the viewfinder main body, and an image enlargement lens body is detachably attached to the viewfinder main body, the image enlargement lens body is attached to the viewfinder Has a projection, and the viewfinder main body has a guide groove for guiding the projection of the image enlarging lens body in the axial direction and a fixed groove that communicates with the guide groove and extends in the circumferential direction. A through-groove extending in the circumferential direction and penetrating through the thickness of the viewfinder main body attachment portion, and forming a crosspiece with the through groove and the axial end of the viewfinder main body attachment portion. The fixed groove side has a smooth R shape, and a protrusion is formed on a part of the fixed groove, and the protrusion of the lens body mounting portion presses the protrusion of the R shape portion of the crosspiece and the fixed groove. Pier Extruded in the axial direction and the radial direction while flexed, image enlarging lens body is mounted on the viewfinder body through the projections of the fixing groove and R-shaped portion of the bar, the projection of the lens body mounting portion An object is fixed by the protrusions of the R-shaped part and the fixing groove .

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