JP5814607B2 - Viewfinder display parts and methods for manufacturing viewfinder display parts - Google Patents

Description

  The present invention relates to an in-finder display component of a camera having a superimpose function and a method for manufacturing the in-finder display component.

  2. Description of the Related Art Conventionally, a finder such as a camera is provided with a superimpose function that serves as an index indicating an imaging range, a distance measurement range, a photometry range, and the like while simultaneously viewing an object in the imaging range. Furthermore, in recent years, cameras and the like have been realized which have a function for performing optimum ranging and metering according to the scene by setting a plurality of ranging and metering points within the field of view. Such a camera or the like notifies the photographer of the position by switching a plurality of designs indicating the positions of the distance measurement and photometry points to light emission or non-light emission in the viewfinder field and display or non-light emission.

  FIG. 15A is a simplified diagram of an optical flat plate as an in-finder display component disclosed in Patent Document 1. FIG. The optical flat plate 991 is provided with a plurality of rectangular frames 992, 993, and 994 as a design for indicating the positions of the distance measurement and photometry points on the optical flat plate shown in FIG.

  FIG. 15B is an enlarged view of the frame 992 of the left and right central region 995 in FIG. FIG. 15C is an enlarged view of the frame 993 of the left peripheral region 996 in FIG. The frames 992 and 993 in FIGS. 15B and 15C are formed by concave prisms 901 and 911 as optical surfaces that reflect illumination light formed side by side on the optical flat plate 991.

  The photographer of the camera can visually recognize the lighting of the frame in the finder by guiding the reflected light from the prism inclined surfaces 902 and 912 to the photographer's pupil when the illumination is emitted. On the other hand, when the illumination is not emitted, the photographer can visually recognize the range where the prism in the finder exists as a frame.

  In the prism 901 of the frame 992 in the left and right central region 995, the ridge lines 904 of the prism 901 are arranged in parallel to the frame 992 as shown in FIG. On the other hand, the prism 911 of the frame 993 in the left peripheral region 996 is arranged with the ridge line 914 of the prism 911 inclined at an angle α with respect to the frame 993 as shown in FIG. Note that the frame 994 (enlarged illustration is omitted) in the right peripheral region 997 in FIG. 15A is leftward with respect to the prism 911 in the frame 993 in the left peripheral region 996 by α.

  As described above, the angles of the prisms 901 and 911 of the frames 992, 993 and 994 differ depending on the region. The positions of the illumination light source for causing the frames to emit light and the frame on the optical flat plate 991 in the camera. Is in a relationship. In other words, the illumination light needs to be reflected to the prism arranged in the frame on the optical plate and guided to the photographer's field of view as reflected light. Therefore, the prism is arranged at an angle α according to the position in the left-right direction. Has been.

JP 2006-099089 A

  However, the conventional optical flat plate has irregularities as indicated by reference numeral 903 between the prisms 901 as shown in FIG. In particular, as shown in FIG. 15C, when the prism 911 is inclined by the angle α, there was an unevenness indicated by reference numeral 913. In this case, the unevenness amount 913 is larger than the unevenness amount 903.

  For this reason, the outline of the frame may not appear sharp depending on the shape of the prism, the size and thickness of the frame. In particular, the unevenness amount 913 of the frames 993 and 994 in the left and right regions 996 and 997 is larger than the unevenness amount 903 of the central frame 992, and the contour is not sharp.

  An object of the present invention is to provide an in-finder display component and a manufacturing method thereof in which the amount of unevenness of the frame contour of the display component in the finder is reduced, the frame contour is sharpened to improve the visibility.

Camera viewfinder display part of the present invention, the surface, the basic reflecting section the ridge and a ridge line where the the inclined surface which is inclined in at least two directions inclined surface is formed in contact are inclined with respect to said surface the multiple arrangement columns, by design that a plurality of rows arranged so as to partially overlap the reflective portion is formed, of the column, the column to form an outer peripheral contour of the design overlaps the basic reflective portion It further has an additional reflection part having an inclined surface formed in such a way as to be inclined in at least two directions and a ridge line formed by contacting the inclined surface.

  The method for manufacturing an in-finder display component of a camera according to the present invention is the in-finder display component in which the basic reflection portion and the additional reflection portion are concave portions formed to be recessed in the surface, and the light is reflected by the surface of the concave portion. In some cases, a base metal formed by continuously cutting a plurality of recessed original basic reflecting portions and original additional reflecting portions having the same shape as the plurality of recessed basic reflecting portions and additional reflecting portions with a single tool. It is characterized in that it is molded on the basis of a duplicate mold formed by reversing the unevenness by a mold.

  In the method for manufacturing an in-finder display component of a camera according to the present invention, the basic reflection portion and the additional reflection portion are protrusions formed so as to protrude from the surface, and the in-finder display reflects light on the inner surface of the protrusion. In the case of a component, the plurality of original basic reflection portions and the original additional reflection portions that are recessed by concavo-convex inversion with respect to the plurality of protruding basic reflection portions and additional reflection portions are continuously cut with a single tool. It is characterized by being molded based on the mold formed by the above.

  The display part in the finder of the present invention is configured such that the concave part of the edge of the design of the display part in the finder is filled with an additional reflection part, so that the amount of unevenness of the edge is reduced, the outline of the design is sharpened, and the visibility is improved. Can be improved.

  Moreover, since the manufacturing method of the display component in a finder of this invention manufactures the display component in a finder using the metal mold | die cut continuously with one tool, it uses a metal mold with high manufacturing precision. It can be manufactured, the outline of the design can be sharpened, and the visibility can be improved.

It is a figure which shows the structure of the optical system of the single-lens reflex camera provided with the optical flat plate as an in-finder display component of embodiment of this invention. It is a figure of the optical flat plate of the camera in embodiment of this invention. It is the elements on larger scale of the frame in the left-right center area | region of the optical flat plate of FIG. (A) is a partially enlarged view of the lower left of the frame. (B) is QQ arrow sectional drawing of (A). (C) is RR arrow sectional drawing of (A). In the optical flat plate of FIG. 2, it is a figure of the basic dent as a basic reflection part which comprises the frame of each area | region. (A) is a top view of a basic dent. (B) is a sectional view taken along the line SS of (A). (C) is a perspective view of a basic dent. In the optical flat plate of FIG. 2, it is a figure of the additional dent as an additional reflection part which comprises the frame of each area | region. (A) is a top view of an additional dent. (B) is a cross-sectional view taken along the line TT of (A). (C) is a perspective view of an additional dent. FIG. 3 is a partially enlarged view of the lower left of the frame in the left peripheral region in the optical flat plate of FIG. 2. It is the schematic explaining the manufacturing method of the optical flat plate in which the basic dent and the additional dent were formed. It is a flowchart of the manufacturing method of FIG. It is a schematic diagram of the processing machine which produces the original metal mold | die used for shape | molding an optical flat plate. (A) is a top view. (B) is a front view. It is a figure of the rotary tool used for the processing machine of FIG. (A) is the figure which looked at the rotary tool from the front end side. (B) is a front view. It is a figure of the basic convex part which forms the frame of an optical flat plate. (A) is a perspective view. (B) is the figure which turned the UU arrow cross section of (A) upside down. It is a perspective view of the additional convex part which forms the frame of an optical flat plate. It is the schematic explaining the manufacturing method of the optical flat plate in which a basic convex part and an additional convex part are formed. It is a flowchart of the manufacturing method of FIG. It is a figure of the optical flat plate as the conventional display component in a finder. (A) is a simplified diagram of an optical flat plate. (B) is an enlarged view of the frame of the left-right center area | region in the optical flat plate of (A). (C) is an enlarged view of the frame of the left peripheral area in the optical flat plate of (A).

  An in-finder display component according to an embodiment of the present invention will be described with reference to the drawings. In addition, the numerical value in embodiment is a reference numerical value, Comprising: It is not a numerical value which limits this invention.

  FIG. 1 is a diagram illustrating a configuration of an optical system of a single-lens reflex camera 1 including an optical flat plate 68 as an in-finder display component according to an embodiment of the present invention.

  The subject image passes through the lens barrel 62 including the photographing optical system 61, is reflected by the quick return mirror 64 in the camera body 63, and is formed on the upper surface of the focusing screen 65. The lens barrel 62 is detachable or integrated with the camera body 63. A silver salt film and a solid-state image sensor (CCD or CMOS sensor) (not shown) are arranged behind the quick return mirror 64 (direction in which light from the photographing optical system 61 goes straight). The quick return mirror 64 switches between the photographing optical path and the finder optical path by rotating in conjunction with the release of the camera. The light reflected upward by the quick return mirror 64 forms an image on the upper surface of the focusing screen 65. Here, a Fresnel surface is formed on the lower surface of the focusing screen 65.

  The subject image formed on the focusing screen 65 is converted into an erect image by the penta roof prism 66 and guided to the photographer's pupil through the eyepiece lens 67. In this case, the subject image is visually recognized by the photographer together with the frame in the finder by the optical flat plate 68 as a display component in the finder provided with a plurality of rectangular frames indicating the positions of the distance measurement and photometry points displayed in the finder. Is done.

  Further, the photographer can know the position of the distance measurement and photometry point because the light reflected by the prism forming the frame provided on the lower surface of the optical flat plate 68, together with the subject image, the penta roof prism 66 and the eyepiece 67 This is because it is guided to the photographer's eyes through the. The reflected light is generated in such a manner that the illumination light emitted from the illumination light source 69 is optically transmitted through the illumination optical system 70 and the penta roof prism 66 in the plane including the optical axis of the imaging optical system 61 from the short side direction of the imaging field. This is a path for irradiating the flat plate 68 obliquely. The short side direction is the left-right direction in FIG. 1, the up-down direction of the optical flat plate in FIG. 2, which will be described later, and the up-down direction in the viewfinder field.

  FIG. 2 is a diagram of the optical flat plate 68 of the camera according to the embodiment of the present invention.

  The optical flat plate 68 is formed with seven frames 51 as designs of the left peripheral region 54. In addition, seven frames 52 as designs of the right peripheral region 55 are also formed. Furthermore, five frames 53 are formed as a design of the left and right central region 56. Accordingly, the frames 51, 52, 53 are formed at 19 convenient places.

  The frames 51, 52, and 53 are provided with a basic recess (prism, basic reflection portion) 26 formed as a recess in the surface 68A of the optical flat plate 68 as shown in FIG. 4, as shown in FIGS. A plurality of parts are overlapped and formed side by side.

  4A is a plan view of the basic recess 26, FIG. 4B is a sectional view taken along the line S-S of FIG. 4A, and FIG. 4C is a perspective view of the basic recess. . The basic recess 26 is formed by slopes 22 and 23 inclined in two directions, a ridge line 21 formed in contact with the slopes 22 and 23, and conical surfaces 24 and 25 located at one end of the ridge line 21. . As shown in FIG. 3B, the slopes 22 and 23 are prisms that reflect the light L and are also reflecting surfaces. As shown in FIG. 4A, the basic recess 26 is formed in a substantially isosceles triangle in plan view. The ridge line 21 is formed so as to connect the vertex of the triangle to the center of the base, and is inclined by an angle δ with respect to the surface 68A of the optical flat plate 68 as shown in FIG. For this reason, the basic recess 26 is a portion where the portion 27 where the inclined surfaces 22 and 23 and the conical surfaces 24 and 25 intersect is most recessed.

  In FIG. 3 (A), the vertical part (vertical part) of the frame 53 is arranged with the basic recess 26 so that the ridge line 21 is parallel to the vertical part of the frame 53, and seven parallel to each other. It is formed side by side. The horizontal portion (horizontal portion) of the frame 53 is formed by arranging the basic recesses 26 so that the ridgeline 21 is parallel to the vertical portion of the frame 53 and a large number of horizontal recesses are arranged in parallel. Incidentally, the width of the frame 53 is about 40 μm, the length from the inner side to the most recessed portion 27 is about 30 μm, and the pitch of the basic recesses 26 is 5 μm.

  Incidentally, the basic recess 26 is formed in a substantially isosceles triangle in plan view as shown in FIG. 4A, and the ridge line 21 is inclined at an angle δ as shown in FIG. 4B. For this reason, in FIG. 3A, recesses 53c and 53d are formed between the basic recesses 26 of the outer edge 53a and the inner edge 53b of the vertical portion of the frame 53 to be uneven. For this reason, when the photographer looks through the viewfinder and looks at the frame 53, the outline of the frame 53 may appear blurred, and the visibility of the frame 53 may be inferior.

  Therefore, in the optical flat plate 68 of the present invention, the recesses 53c and 53d (inside the recesses) between the basic recesses 26 are formed with the additional recesses 16 so as to fill the recesses 53c and 53d, and the unevenness amounts of the recesses 53c and 53d. 34 (FIG. 3A) was reduced. Accordingly, when the photographer looks into the finder and looks at the frame 53, the outline of the frame 53 can be seen clearly, and the visibility of the frame 53 can be improved.

  The configuration will be described below. 5A is a plan view of the additional recess 16, FIG. 5B is a cross-sectional view taken along the line TT in FIG. 5A, and FIG. 5C is a perspective view of the additional recess. . The additional dent 16 has such a shape that a top portion of a substantially isosceles triangle in a plan view of the basic dent 26 (FIG. 4A) is cut.

  The additional dent 16 (prism, additional reflecting portion) includes slopes 12 and 13 inclined in two directions, a ridge line 11 formed by contacting the slopes 12 and 13, and conical surfaces 14 and 15 located at one end of the ridge line 11. It is formed with. The inclined surfaces 12 and 13 are prisms that reflect light and are also additional reflecting surfaces, like the inclined surfaces 22 and 23 of the basic recess 26. A portion of the additional recess 16 on the side opposite to the conical surfaces 14 and 15 of the inclined surfaces 12 and 13 is an arc portion 18. The ridge line 11 is formed so as to connect the center of the arc portion 18 and the portion where the conical surfaces 14 and 15 intersect with each other, and as shown in FIG. 5B, the ridge line 11 is formed on the optical surface (front surface) 68A of the optical flat plate 68. In contrast, it is inclined by an angle δ. For this reason, the additional dent 16 is a portion where the portion 17 where the inclined surfaces 12 and 13 and the conical surfaces 14 and 15 intersect is most concave.

  As shown in FIG. 3A, which is a plan view of the optical flat plate 68, the additional dent 16 and the basic dent 26 are arranged such that the ridge line 11 of the additional dent 16 and the ridge line 21 of the basic dent 26 are positioned in a straight line. Is formed. For this reason, in FIG. 3A, a vertical row of basic recesses 26 (basic recesses arranged on the line of the cross-sectional arrow Q) located at the edge of the vertical portion of the frame 53 in the vertical direction and a row inside thereof. A part of the basic recess 26 is formed in the additional recess 16.

  Thereby, the unevenness | corrugation amount 34 of the outer periphery outline of the frame 53 in which the plurality of basic dents 26 and the additional dents 16 are arranged can be made smaller than the unevenness amount 903 shown in FIG.

  The frame 53 described above is a frame of the left and right central region 56 shown in FIG. A frame 51 (FIGS. 2 and 6) described next is the frame 51 of the left peripheral region 54.

  FIG. 6 is a partially enlarged view of the lower left part of the frame 51 and corresponds to FIG. 6, parts similar to those in FIG. 3A are given the same reference numerals, and descriptions thereof are omitted. The frame 51 of the left peripheral region 54 is also formed by the basic recess 26 (FIG. 4) and the additional recess 16 (FIG. 5), like the frame 53 of the left and right central region 56 (FIG. 2).

  However, in FIG. 6, the vertical portion (vertical portion) of the frame 51 is arranged by inclining the basic recess 26 with the ridge line 21 inclined by α with respect to the vertical portion of the frame 51, and five in parallel to each other. It is formed side by side. The left and right portions (horizontal portions) of the frame 51 are also formed by inclining the basic recesses 26 by tilting the ridge line 21 by α with respect to the vertical portions of the frame 51 and arranging a large number of them horizontally in parallel. .

  In addition, the vertical outer edge 51a of the frame 51 is also formed by forming the additional recess 16 in the recess 51c between the basic recesses 26 to fill the recess 51c, thereby reducing the unevenness amount 4 (FIG. 6) of the recess 51c. It is. In this case, the ridge line 21 of the basic dent 26 and the ridge line 11 of the additional dent 16 are parallel to each other but are shifted from each other. The frame 51 can also improve the visibility of the frame 51 by making the outline of the frame 51 clear when the photographer looks into the viewfinder and looks at the frame 51.

  Next, the frame 52 of the right peripheral area 55 will be described. Although the enlarged view of the frame 52 is omitted, the frame 52 is also formed by a number of basic recesses 26 (FIG. 4), as in FIG. 6, and the recesses at the vertical outer edges of the frame 52 are added to the additional recesses 16 (FIG. 5). ). However, the angle of α shown in FIG. 6 is inclined to the frame 52 in the opposite direction with respect to the vertical portion of the frame 52.

  As described above, the frame 51 in the left peripheral region, the frame 52 in the right peripheral region, and the frame 53 in the left and right central region fill the recesses 51c, 53c, 53d, etc. at the edges of the vertical portions with the additional recesses 16 and the amount of unevenness 4 , 34 are reduced.

  As a result, when the illuminator emits light, the photographer reflects the light reflected by the slopes 22 and 23 serving as the prism of the basic recess 26 and the slopes 12 and 13 serving as the prism of the additional recess 16 and the penta roof prism and the eyepiece. Can be visually recognized as a frame in the viewfinder. For this reason, the photographer can visually recognize a frame having a small amount of unevenness of the outer peripheral contour in the finder in a range where the basic recess 26 and the additional recess 16 exist when no illumination is emitted. Thus, the photographer can visually recognize the high-quality frame in the finder of the camera even when the frame is not lit and when the frame is lit.

  In the above description, the focusing screen 65 and the optical flat plate 68 shown in FIG. 1 are separate members, but may be a single member. That is, the frames 51, 52, and 53 including the basic recess 26 and the additional recess 16 described above may be formed on the focusing screen 65 arranged at the imaging position of the photographing optical system.

  Next, a method for manufacturing the optical flat plate (in-finder display component) 68 will be described. FIG. 7 is a schematic view showing a manufacturing process. FIG. 8 is a flowchart of the manufacturing method.

  First, a plurality of original basic dents (original basic reflection portions) 26A and original additional dents (original additional reflection portions) 16A having the same shape as the optical flat plate 68 are formed on a base metal of the mold with a single tool 80 described later. The original die 41 is manufactured continuously by the mold manufacturing method. This process is referred to as a former mold manufacturing process (S81 in FIG. 7A and FIG. 8).

  Then, for example, a duplicate mold 42 is created in which the basic recess 26 and the additional recess 16 carved into the original mold 41 by electroforming plating are inverted (replica mold manufacturing process, FIG. 7B, S82 in FIG. 8). ). In this case, the protruding portion is a portion that becomes the basic recess 26 and the additional recess 16 in the next step.

  Subsequently, plastic molding such as injection molding is performed using the replica mold 42 (molding process, FIG. 7C, S83 in FIG. 8).

  Finally, the plastic molded product 43 is separated from the duplicate mold 42. The separated plastic molded product 43 is an optical flat plate 68 in which the basic recess 26 and the additional recess 16 are formed. Thus, the optical flat plate 68 is formed and manufactured (molded product separation step, FIG. 7D, S84 in FIG. 8).

  In the manufacturing method of the optical flat plate 68 described above, since the replication mold is formed using a replication technique such as electroforming plating, the optical flat plate 68 can be easily formed in consideration of the manufacturing time and labor of the mold. it can.

Next, a processing method of the base die 41 required for molding the in-finder display component of the present invention will be described with reference to FIGS. Figure 9 is a schematic diagram of a processing machine 79 to manufacture the principal type 41, (A) is a plan elevational view, (B) is a positive plane view. 10A and 10B are views of the rotary tool 80 used in the processing machine of FIG. 9, where FIG. 10A is a view of the rotary tool viewed from the front end side, and FIG. 10B is a front view.

  The processing machine 79 is a 5-axis NC processing machine having two rectilinear positioning axes of an XY slider 75 and a Z slider 73 in three orthogonal directions, and two rotational positioning axes of a B-axis rotating device 74 and a C-axis rotating device 76.

  A rotary tool 80 that performs cutting is attached to a rotary spindle 78 fixed on a C-axis rotating device 76 so that it can rotate at a high speed. In addition, the work piece 71 to be the original mold 41 is fixed to the B-axis rotating device 74 so that the rotation angle around the B-axis can be adjusted.

A rotary tool 80 shown in FIG. 10 is formed of a shank portion 85 and a blade edge portion 86 attached to a rotary spindle 78 (FIG. 9). A single crystal diamond tip 87 is brazed to the tip of the blade edge portion 86 to form a blade edge. The state-of-the-art single crystal diamond tip 87 is polished into a triangular pyramid shape to form three cutting edge ridge lines 84. The three cutting edge ridge lines 84 are formed in rotational symmetry with respect to the tool center axis 88 passing through the apex of the triangular pyramid. Further, the apex angle θ formed by the cutting edge ridge line 84 and the tool center axis 88 is an angle γ of the V-shaped groove formed by the inclined surfaces 22 and 23 of the basic recess 26 (FIG. 4C), and the additional recess 16. The angle γ (FIG. 5C) of the V-shaped groove formed by the slopes 12 and 13 is set to ½ or less. That is, θ ≦ γ / 2 is set.

  When machining the inclined surfaces 22, 23 and 12, 13 of the groove with the groove bottom angle γ with the triangular pyramid rotary tool 80 having such an apex angle θ, the difference between the angles of γ / 2 and θ is The angle of each C-axis rotating device 76 (β in FIG. 9A) is adjusted.

Next, a procedure for manufacturing the original mold 41 by forming the frames 52, 53, 51 formed on the optical flat plate 68 on the workpiece 71 using the processing machine 79 and the rotary tool 80 will be described. Only the procedure for engraving the basic recess 26 into the workpiece 71 will be described, and the procedure for engraving the additional recess 16 will be omitted.

  First, the workpiece 71 is attached to the B-axis rotating device 74 with its orientation determined in the Z-axis direction so that the ridge line 21 formed by the inclined surfaces 22 and 23 can be accurately formed parallel to the ZY plane. Depending on the direction in which the work piece 71 is attached to the B-axis rotating device 74, the direction of the basic recess 26 is changed to the direction along the vertical edges 53a and 53b of the frame 53 in the left and right central region, or the frame 51 in the left peripheral region. The outer edge 51a, 52a of 52 can be in an orientation inclined by α. Note that the inclination α of the basic recess of the frame 51 and the inclination α of the basic recess of the frame 52 are opposite to each other.

  Then, the runout of the rotary tool 80 is adjusted so that the apex 81 of the triangular pyramid at the tip of the rotary tool 80 and the tool center axis 88 of the rotary tool 80 coincide with the rotation center axis of the rotary spindle 78. To the rotating spindle 78. At this time, the rotary tool 80 protrudes by a predetermined length from the rotary spindle 78 so that the apex 81 of the triangular pyramid of the rotary tool 80 coincides with the central axis (C axis) of the C-axis rotating device 76. Adjusted.

  Note that the apex 81 of the triangular pyramid may be attached with a deviation from the central axis (C axis) of the C axis rotation device 76. In order to prevent this, test processing is performed in advance, and the amount of error in the XY directions between the vertex 81 and the central axis (C axis) is measured. Then, using the positioning function of the XY slider 75, the angle β of the C-axis rotating device 76 is adjusted to adjust the error amount.

After the above adjustment, the rotary tool 80 is rotated at a predetermined rotational speed by the rotary spindle 78, and the apex 81 is first set to a position where the ridgeline 21 of the groove can be processed using the X axis and the Z axis. Match. Next, the vertex 81 of the rotary tool 80 is scanned using the Y-axis and the Z-axis, and the ridgeline 21, the one-side inclined surface 22, and the conical surface 24 of the basic recess 26 are moved to the workpiece 71 by the rotary tool 80. Form. Subsequently, in order to form the slope 23 on the opposite side, based on a difference (γ / 2) that is half of the apex angle θ of the triangular pyramid of the rotary tool 80 and the base angle γ of the groove formed by the slopes 22 and 23. The angle β of the C-axis rotating device 76 is adjusted. Thereafter, the opposite inclined surface 23 and conical surface 25 are processed by scanning again along the previously formed ridge line 21. In this way, the basic recess 26 formed by the inclined surfaces 22 and 23 and the conical surfaces 24 and 25 is cut into the workpiece 71.

  After the formation of one basic recess 26, the next basic recess 26 is continuously formed by the same procedure with the rotary tool 80 next to the base recess 26 at a distance narrower than the width of the basic recess 26 shown in FIG.

  In this way, a large number of basic recesses 26 and a plurality of additional recesses 16 are formed to form the frames 51, 52, 53. As a result, the workpiece 71 becomes the original mold 41.

  The original mold 41 is used to form a duplicate mold 42 as shown in FIG.

  In this way, the original mold 41 is processed without adjusting the position of the rotary tool with one rotary tool after starting the processing, so that the processing accuracy is improved and the processing time is shortened. It is done.

  The frames 51, 52, and 53 described above are formed by the basic recess 26 and the additional recess 16, but are formed by the basic protrusion 126 and the additional protrusion 116 as shown in FIGS. Also good. FIG. 11A is a perspective view of the basic convex portion 126. (B) is the figure which turned the UU arrow cross section of (A) upside down.

  The basic convex portion (basic reflective portion) 126 and the additional convex portion (additional reflective portion) 116 are formed by reversing the shapes of the basic recess 26 (basic reflective portion) and the additional recess 16 (additional reflective portion). Yes.

The basic convex portion 126 is formed by slopes 122 and 123 inclined in two directions, a ridgeline 121 formed by contact with the slopes 122 and 123, and conical surfaces 124 and 125 located at one end of the ridgeline 121. As shown in FIG. 11B, the inclined surfaces 122 and 123 are prisms that reflect the light L and are also reflecting surfaces. The inclined surfaces 122 and 123 have the inner surface of the optical flat plate 168 as a reflecting surface. The basic convex portion 126 has a shape as shown in FIG. 11A in plan view, and is formed in a substantially isosceles triangle. The ridge line 121 is formed so as to connect the vertex of the triangle to the center of the base, and is inclined by an angle δ with respect to the surface 168A of the optical flat plate 168 as shown in FIG. For this reason, the basic convex portion 126 is a portion where the portion 127 where the inclined surfaces 122 and 123 and the conical surfaces 24 and 25 intersect is the most protruding portion.

  FIG. 12 is a perspective view of the additional protrusion 116. The additional convex part 116 has a shape obtained by cutting the top part of the substantially isosceles triangle in plan view of the basic convex part 126.

  The additional convex part 116 is formed by slopes 112 and 113 inclined in two directions, a ridge line 111 formed by contacting the slopes 112 and 113, and conical faces 114 and 115 located at one end of the ridge line 111. The inclined surfaces 112 and 113 are also prisms with the inner surface as a reflecting surface, like the inclined surfaces 122 and 123 of the basic convex portion 126. The portions on the opposite side of the conical surfaces 114 and 115 of the slopes 112 and 113 of the additional convex portion 116 are arc portions 118. The ridge line 111 is formed so as to connect the center of the arc portion 118 and the portion where the conical surfaces 114 and 115 intersect with each other, and as shown in FIG. 11B, the ridge line 111 has an angle δ with respect to the surface 168A of the optical flat plate 168. Just tilted. For this reason, the additional convex part 116 is a part where the part 117 where the inclined surfaces 112 and 113 and the conical surfaces 114 and 115 intersect is the most protruding part.

  Next, a manufacturing method of the optical flat plate 168 in which a frame is formed by the basic convex portion 126 and the additional convex portion 116 will be described.

  FIG. 13 is a schematic view showing a manufacturing process. FIG. 14 is a flowchart of the manufacturing method.

  First, a plurality of original basic recesses 26A and original additional recesses 16A corresponding to the opposite shapes of the optical flat plate 168 and the concave and convex shapes are continuously engraved into the base metal of the mold with a single tool 80 to manufacture the mold 41 ( Mold manufacturing process, FIG. 13 (A), S141 in FIG. 14). This mold is the original mold shown in FIG.

  Then, plastic molding such as injection molding is performed using the mold 41 (molding process, FIG. 13B, S142 in FIG. 14).

  Finally, the plastic molded product 32 is separated from the mold 41. The separated plastic molded product 32 is an optical flat plate 168 in which a basic convex portion 126 and an additional convex portion 116 are formed. As a result, the optical flat plate 168 is formed and manufactured (molded product separation step, FIG. 13C, S143 in FIG. 14).

  In addition, since the used metal mold | die is shown in FIG. 7, description of the manufacturing method of a metal mold | die is abbreviate | omitted.

1: single-lens reflex camera, 4: unevenness of outer peripheral contour, 11: ridgeline, 12, 13: slope, 16: additional dent (prism, additional reflection part), 16A: original additional dent (original additional reflection part), 21: Ridge line 22, 23: Slope, 26: Basic dent (prism, basic reflection part), 26A: Original basic dent (original basic reflection part), 32: Molded product, 34: Concavity and convexity of outer contour, 41: Original mold 42: replica mold, 43: molded product, 51: frame in the left peripheral area (design), 51a: outer edge of the frame, 51c: recess in the outer edge, 52: frame in the right peripheral area (design), 53: left and right central area frame (design), 53a: outer edge, 53b: inner edge, 53c: outer edge recess, 53d: inner edge recess, 54: left peripheral area, 55: right peripheral area 56: Left and right central region, 68: Optical flat plate (in-finder display component), 68A: Optical (Surface), 79: machine, 80: rotating tool, 111: ridge, 112, 113: slope 116: Additional protrusions (prisms, additional reflection portion), 116A: optical surface (surface),
121: ridgeline, 122, 123: slope, 124, 125: conical surface, 126: basic convex part (prism, basic reflection part), 168: optical flat plate (in-finder display component), 168A: surface of the optical flat plate.

Claims (5)

The surface overlaps at least partially with a row in which a plurality of basic reflecting portions having a slope inclined in at least two directions and a ridge line formed by contacting the slope with the ridge line inclined with respect to the surface are arranged on the surface. In the finder display part of the camera in which the reflective part is formed, according to the design arranged in multiple rows ,
Among the columns, the column to form an outer peripheral contour of the design is the additional reflection portion having a ridge line in which the inclined surface and the inclined surface which is inclined in at least two directions which are formed so as to overlap the basic reflective portion is formed in contact In addition,
A display part in the viewfinder of the camera. The additional reflector part and the basic reflective portion is a recess formed recessed into the surface to reflect light in terms of the recess,
The in-finder display component of the camera according to claim 1. The additional reflector part and the basic reflective portion is a convex portion formed to protrude from the surface, reflects light by the inner surface of the convex portion,
The in-finder display component of the camera according to claim 1. A method of manufacturing a display part in a viewfinder of a camera according to claim 2,
Concavity and convexity due to the original mold formed by continuously cutting a plurality of concave original basic reflection portions and original additional reflection portions having the same shape as the plurality of concave basic reflection portions and additional reflection portions with a single tool. Molded based on a replica mold formed by reversing,
A method for manufacturing a display part in a viewfinder of a camera. A method for manufacturing a display part in a viewfinder of a camera according to claim 3,
An original formed by continuously cutting a plurality of original basic reflective portions and original additional reflective portions, which are concave and convex with respect to the plurality of protruding basic reflective portions and additional reflective portions, with a single tool. Molded based on the mold,
A method for manufacturing a display part in a viewfinder of a camera.

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