JP4125609B2 - Close-up adapter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an adapter for close-up photography that is attached to the front surface of a camera.
[0002]
[Prior art]
A lens unit with a lens, which is a simple camera that can be used once, is known so that anyone can easily take a picture. In the standard model of a film unit with a lens, a fixed focus type photographing lens in which the focus set position is adjusted to a photographing distance range from 1 m to infinity is used. Using this standard model for self-shooting and close-up shots such as close-up shots of flowers and pets will not only focus, but the flash will be too bright and overexposed, resulting in good image quality. Can not. In view of this, an adapter for close-up shooting that enables shooting at a shooting distance of 1 m or less, such as self-shooting, by attaching to the front surface of a standard model has been commercialized (for example, see Patent Document 1).
[0003]
This adapter for close-up photography is arranged in front of the taking lens and an adapter body having an attaching portion for fixing to the lens-fitted photo film unit body, and is used in combination with the taking lens to bring the focus set position to the near distance side. It consists of a close-up auxiliary lens to be changed, and a dimming plate that is disposed in front of the strobe light emitting unit to diminish the strobe light. The light-reducing plate is a light-shielding plate having substantially the same size as the strobe light emitting unit, and a plurality of holes through which strobe light passes.
[0004]
The above-mentioned close-up adapter is provided with a light reducing plate 81 as shown in FIG. 13, and three kinds of holes 82a to 82c having different diameters are formed. These three kinds of holes 82a to 82c are shielded from light. It arrange | positions so that an aperture may become large as it goes to the periphery from the center of the board 83. FIG. By doing so, the light distribution range is prevented from being narrowed. The holes 82a to 82c are aligned so that their centers are located on a straight line parallel to the horizontal axis Ah or the vertical axis Av passing through the center of the light shielding plate 83, and the arrangement pattern thereof is The horizontal axis Ah and the vertical axis Av are used as a reference, and the upper, lower, left, and right are arranged.
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-38480 [0006]
[Problems to be solved by the invention]
However, when the holes are regularly arranged as in the case of a conventional close-up adapter, uneven light distribution occurs regularly, and there is a problem that the degree of uneven light distribution increases. . That is, a bright part and a dark part occur regularly, and the difference between the brightness and darkness is large, and there is a problem that uneven light distribution becomes very conspicuous.
[0007]
An object of the present invention is to provide an adapter for close-up photography having a light reducing plate with little light distribution unevenness.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the close-up shooting adapter of the present invention is attached to the front surface of a camera provided with a shooting lens and a strobe light emitting unit, and is disposed in front of the shooting lens, so that the focus set position is at a short distance. A close-up photographing adapter comprising a close-up auxiliary lens to be changed to a side and a dimming plate arranged in front of the strobe light emitting unit, wherein the light from the strobe light emitting unit passes through the light reducing plate The passage holes are arranged so that their arrangement pattern is asymmetrical in the vertical and horizontal directions with respect to the horizontal axis and the vertical axis passing through the center of the light shielding plate. It is characterized by being.
[0009]
When the passage hole is composed of a plurality of types of holes having different diameters, and the centers of two adjacent holes are arranged side by side on a straight line parallel to the horizontal axis or the vertical axis, the diameters thereof Are preferably different.
[0010]
The inner periphery of the passage hole may be tapered so that the front-side diameter is larger than the rear-side diameter of the light-reducing plate. Further, it is preferable that the light distribution angle of the strobe light obtained by passing through the light reducing plate is matched with the photographing field angle of the close-up auxiliary lens.
[0011]
When the dimming plate is disposed to be inclined with respect to the light emitting surface of the strobe light emitting unit, the area occupied by the passage hole in a region away from the light emitting surface with respect to the horizontal axis is It is preferable to make it larger than the occupied area of the region where the distance is short.
[0012]
The front surface of the adapter body is provided with an angle-of-view confirmation display unit for the photographer to check the angle of view during self-photographing. The display unit is disposed at the back of the recess and the photographer. Is preferably a mark that can be visually recognized by the photographer when it is within the angle of view of the auxiliary lens for close-up photography.
[0013]
The adapter body is preferably provided with a reflecting mirror for the photographer to check the angle of view during self-photographing.
[0014]
It is preferable that the adapter main body is provided with a field frame for close-up shooting that is disposed in front of the viewfinder lens of the camera and corrects the field of view of the viewfinder lens according to the parallax generated during close-up shooting.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
A close-up shooting adapter 11 is detachably attached to the front surface of the lens-fitted photo film unit 10 shown in FIG. As is well known, the lens-fitted photo film unit 10 is a unit main body 12 equipped with a simple exposure mechanism and previously loaded with an unexposed photographic film at the time of manufacture. The unit main body 12 includes a main body base provided with a film storage chamber, a finder optical system, an exposure mechanism, a strobe device, and the like, and a front cover and a rear cover that cover the main body base from the front and rear. On the front surface of the unit main body 12, there are provided a photographing lens 13, a finder lens 14, a strobe light emitting unit 16, an operation member 17 for selecting whether or not the strobe device emits light.
[0016]
Around the photographic lens 13, there is provided a raised portion 18 for preventing the user's finger from entering the optical path of the photographic lens 13. The viewfinder lens 14 is exposed from the viewfinder objective window 19. The size of the viewfinder objective window 19 is determined according to the shooting range (view angle) of the shooting lens 13, and the view angle of the shooting lens 13 and the shooting range confirmed through the viewfinder are almost the same size. Thus, the field of view range of the finder lens 14 is regulated.
[0017]
This lens-fitted photo film unit 10 is a standard type that is already on the market (product name: photographic runn is simple Eye), and the photographing lens 13 has a focus set position adjusted to a photographing distance range from 1 m to infinity. A fixed focus lens is used.
[0018]
The close-up adapter 11 includes an adapter main body 32 in which a close-up auxiliary lens (hereinafter simply referred to as auxiliary lens) 31 is incorporated, and an attachment frame 33 for attaching the adapter main body 32 to the lens-fitted photo film unit 10. The adapter main body 32 has a retracted position (shown in FIG. 1A) for retracting the auxiliary lens 31 from the optical path of the photographing lens 13, and the auxiliary lens 31 is disposed in front of the photographing lens 13. It is attached to the attachment frame 33 so as to be rotatable between an insertion position for insertion on the road (shown in FIG. 1B).
[0019]
As shown in FIG. 2, the attachment frame 33 is formed with an opening 34 for exposing the photographing lens 13 and the raised portion 18 in the center. On the back surface of the mounting frame 33, an engaging claw 35 and a positioning projection 36 are provided. The unit main body 12 is provided with an engagement hole 12 a that engages with the engagement claw 35 and a positioning hole 12 b that engages with the protrusion 36. The attachment frame 33 is attached to the unit body 12 by claw engagement between the engagement claw 35 and the engagement hole 12a. The attachment frame 33 is attached at the stage of product assembly so that the user cannot inadvertently remove it. In consideration of selling the adapter alone, it may be detachably attached.
[0020]
In addition, a hook 37 is provided at the lower portion of the attachment frame 33 so that a shaft portion 38 formed on the adapter main body 32 is detachably fitted. By fitting the shaft portion 38 to the hook 37, the adapter main body 32 can rotate between the insertion position and the retracted position.
[0021]
The auxiliary lens 31 is a close-up lens that changes the focus set position by being combined with the photographing lens 13 that is a main lens. By the combination of the auxiliary lens 31 and the photographing lens 13, the focus set position is changed to a photographing distance range (for example, a range of 40 cm to 80 cm) of 1 m or less. As a result, even when close-up shooting is performed, good image quality can be obtained.
[0022]
As shown in FIG. 3, a protruding portion 39 is provided around the auxiliary lens 31, and even when the adapter main body 32 is set at the insertion position, the finger enters the optical path of the auxiliary lens 31. Is preventing.
[0023]
The adapter main body 32 is integrally provided with a close-up finder field frame (hereinafter referred to as a close-up field frame) 41 above the auxiliary lens 31. As shown in FIG. 3, the close-up field frame 41 is a field frame for correcting parallax caused by the deviation of the optical axis of the finder lens 14 and the optical axis of the photographing lens 13. Yes, limiting the field of view of the viewfinder objective window 19.
[0024]
As is well known, when the optical axis of the finder lens 14 and the optical axis of the photographing lens 13 are separated from each other, parallax occurs, and the deviation increases as the photographing distance becomes shorter. When the adapter main body 32 is in the insertion position, it is considered that the shooting distance is short. For this reason, by limiting the region (indicated by hatching in the drawing) far from the optical axis of the photographing lens 13 in the field of view of the finder objective window 19 by the close-up field of view frame 41, the field of view confirmed by the finder The photographing range photographed by the photographing lens 13 is prevented from being greatly deviated.
[0025]
A target ring 42 indicating the center position in the screen is disposed in the close-up field of view frame 41. At the time of framing, the main subject is aligned with the center of the target ring 42 so that the main subject can be easily reflected at the center of the screen.
[0026]
The adapter main body 32 is provided with a reflection mirror 43 on the left side of the proximity photographing field frame 41 when viewed from the front. The reflection mirror 43 is used to confirm whether or not the user who is the subject is within the angle of view when the user performs so-called self-photographing of the user. The reflecting mirror 43 is formed of a convex mirror, and the direction of the reflecting mirror and the curvature of the convex surface are matched to the angle of view of the auxiliary lens 31 so that a subject within the angle of view of the auxiliary lens 31 can be captured. It has been decided.
[0027]
Further, a light reduction plate 46 is provided on the right side of the close-up field of view frame 41. The light reducing plate 46 is disposed at a position corresponding to the front surface of the strobe light emitting unit 16. The light reducing plate 46 cuts off part of the strobe light emitted from the strobe light emitting unit 16 during close-up photography, thereby reducing the strobe light and preventing the exposure amount from being exceeded. The light reducing plate 46 has a light shielding property, and a light shielding plate 47 that covers the entire surface of the strobe light emitting unit 16 is formed with a passage hole 48 including a large number of holes through which strobe light passes. The passage hole 48 includes a plurality of types of holes 48a to 48f having different diameters. The diameters Da to Df of the holes 48a to 48f are larger in the order of Da, Db, Dc, Dd, De, and Df.
[0028]
The holes 48 a to 48 f are arranged so that their arrangement patterns are asymmetrical with respect to the horizontal axis Ah and the vertical axis Av passing through the center of the light shielding plate 47. Here, the horizontal axis Ah is a direction parallel to the tube axis direction of the discharge tube. Furthermore, the holes are arranged irregularly. That is, as shown in FIG. 6A, each of the holes 48a to 48f is on a straight line Lh or straight line Lv in which the centers of two adjacent holes are parallel to the horizontal axis Ah or the vertical axis Av. It is arranged so as not to be located in. Further, the holes having different diameters are adjacent to each other so that the two adjacent holes do not have the same diameter. As described above, since the regularity is lost in the arrangement of the passage holes 48, the regularity of the light distribution unevenness is also lost, and the light distribution unevenness is not noticeable.
[0029]
In this example, the centers of two adjacent holes are not aligned on the straight line Lh or the straight line Lv. However, as shown in FIG. 6B, the centers of the two adjacent holes are straight lines Lh or Lv. You may line up. However, in that case, it is preferable that the diameters of two adjacent holes are different.
[0030]
The light reducing plate 46 is disposed in front of the strobe light emitting unit 16. The strobe light emitting unit 16 transmits the flashlight 51 emitted from the main capacitor, the reflector 52 disposed on the back surface thereof for reflecting light toward the subject, and the strobe light emitted from the flashlight 51. A diffusion plate 53 that diffuses the strobe light is also included.
[0031]
The front surface of the unit main body 12 has a raised portion 18 formed around the photographing lens 13 or a curved surface from the central portion to the upper end portion. In addition, the light emitting surface 53 a of the strobe light emitting unit 16 is disposed at a position recessed from the front surface of the unit main body 12. Due to the design restrictions of the unit main body 12, when the light reducing plate 46 is arranged in parallel with the light emitting surface 53a, the distance between the light reducing plate 46 and the light emitting surface 53a is greatly increased.
[0032]
However, as shown in FIG. 8, if the diameter d of the passage hole 48 is the same, the light distribution angle R decreases as the distance L between the light reducing plate 46 and the light emitting surface 53a increases, and the light distribution is improved. It will get worse. That is, the light distribution angle r1 at the distance L1 (FIG. 8A) is smaller than the light distribution angle r2 at the distance L2 shorter than the distance L1 (FIG. 8B). Therefore, the dimming plate 46 is disposed at an angle α in accordance with the front shape of the unit main body 12 so that only a part of the dimming plate 46 can be brought close to the light emitting surface 53a. By doing so, the upper part of the light reducing plate 46 approaches the light emitting surface 53a, so that deterioration of light distribution is prevented.
[0033]
As described above, the greater the distance between the light reducing plate 46 and the light emitting surface 53a, the worse the light distribution. In order to suppress the deterioration of the light distribution, the occupied area of the passage hole 48 at a portion having a large distance from the light emitting surface 53a is made larger than the occupied area of the passage hole 48 at a portion having a narrow interval. In this example, the lower part of the light reducing plate 46 is farther away from the light emitting surface 53a than the upper part. Therefore, the area occupied by the passage hole 48 in the light shielding plate 47 is lower than the upper part of the horizontal axis Ah. The side is enlarged. As a method for increasing the area occupied by the passage hole 48, there are methods such as increasing the diameter of each hole or increasing the number of holes.
[0034]
Further, as shown in FIG. 9, the inner peripheral surface of the passage hole 48 is tapered so that the diameter d2 on the front surface side is larger than the diameter d1 on the rear surface side of the light reducing plate 46. In this way, by providing the taper, the light distribution angle r is increased, and the light distribution unevenness is reduced.
[0035]
Further, as shown in FIG. 7, the taper angle β of the passage hole 48 may not be uniform in each part of the inner peripheral surface, and may be changed according to the inclination α of the light reducing plate 46. In this example, since the front surface of the dimming plate 46 is inclined so as to face upward, in consideration of the light distribution of the strobe light downward, the lower taper angle β2 of the inner peripheral surface is changed to the upper taper angle β1. Is bigger than. In addition, the taper angle of the hole located near the periphery may be determined so that the light distribution angle R of the entire passage hole 48 matches the angle of view of the auxiliary lens 31. In this way, the strobe light can be irradiated over the entire photographing range of the auxiliary lens 31.
[0036]
Hereinafter, the operation of the above configuration will be described. The proximity photographing adapter 11 is attached to the lens-fitted photo film unit 10. When the shooting distance is 1 m or longer, such as when shooting a landscape or a person, as shown in FIG. 1A, the adapter main body 32 is moved to the retracted position and shooting is performed. Since the photographing lens 13 has a focus set position in which the photographing distance is 1 m to infinity, it is possible to photograph a subject within the photographing distance range with clear image quality.
[0037]
On the other hand, when self-photographing or macro-photographing a flower or a plant, as shown in FIG. 1B, the adapter main body 32 is set at the insertion position. Since the adapter main body 32 is rotatably attached to the attachment frame 33, the adapter main body 32 can be easily rotated to the insertion position. At this insertion position, the auxiliary lens 31 is disposed in front of the photographic lens 13, and the focus set position is changed to the near distance side where the photographic distance range is 1 m or less in combination with the photographic lens 13. Thus, even when close-up shooting is performed, a clear print is obtained without being out of focus.
[0038]
Further, since the adapter main body 32 is provided with the close-up field of view frame 41, the parallax is corrected. For this reason, even in the case of close-up shooting, the viewfinder field range confirmed during framing and the shooting range shot by the shooting lens 13 are not greatly shifted. Further, since the close-up field frame 41 is provided with a target ring 42, the main subject position can be easily aligned with the center of the screen by superimposing the target ring 42 and the main subject.
[0039]
When performing strobe shooting, the subject is irradiated with strobe light that has passed through the light reducing plate 46. The light reducing plate 46 can prevent overexposure. Further, since the light distribution angle R of the strobe light passing through the light reducing plate 46 is adjusted to the angle of view of the auxiliary lens 31, the strobe light is irradiated over the entire photographing range. Further, since the arrangement pattern of the passage holes 48 of the light reducing plate 46 is asymmetrical with respect to the horizontal axis Ah and the vertical axis Av, light distribution unevenness within the irradiation range is suppressed. The passage hole 48 includes a plurality of types of holes 48a to 48f having different diameters. Further, the holes 48a to 48f are configured such that the centers of adjacent holes are not aligned on the straight line Lh and the straight line Lv. Therefore, regularity is further eliminated, and uneven light distribution is suppressed.
[0040]
Further, since the inner peripheral surfaces of the holes 48a to 48f are tapered so that the aperture on the front surface side is larger than the rear surface side, the light distribution angle r of each hole is increased and the light distribution property is increased. Will improve. Further, since the dimming plate 46 is disposed to be inclined with respect to the light emitting surface 53a, the lower portion of the dimming plate 46 has a larger distance from the light emitting surface 53a than the upper portion. However, since the occupied area of the passage hole 48 is increased in order to suppress the deterioration of the light distribution, uneven light distribution is suppressed. Thereby, while preventing overexposure, a favorable print with little light distribution nonuniformity is obtained.
[0041]
In the said embodiment, although the example which provided the reflection mirror in the adapter main body was demonstrated, it is not necessary to provide a reflection mirror. FIG. 10 shows an example of the close-up shooting adapter 61 without a reflecting mirror. If there is no reflecting mirror, there is a merit that the cost of the close-up shooting adapter 61 can be reduced. On the other hand, there is a demerit that it is not possible to check whether the subject is within the angle of view when performing self-shooting. is there. Therefore, an angle-of-view confirmation display unit 63 for the photographer to confirm the angle of view at the time of self-photographing may be provided on the front surface of the adapter main body 62.
[0042]
As shown in FIG. 11, the angle-of-view confirmation display unit 63 is disposed behind the recess 65 and the recess, and can be visually recognized by the photographer when the photographer is within the angle of view of the auxiliary lens 31. It consists of a mark 66. The recess 65 is formed on the front surface of the adapter main body 62, and the mark 66 is formed by a protrusion formed on the front surface of the attachment frame 33. When the adapter main body 62 is moved to the insertion position, the mark 66 enters the opening 65a formed at the back of the recess 65.
[0043]
The angle θ at which the mark 66 can be seen is determined according to the angle of view of the auxiliary lens 31. Since the angle θ is determined according to the size (diameter) of the mark 66 and the depth at which the mark 66 is disposed, the diameter and depth of the mark 66 are determined so that the angle θ matches the angle of view of the auxiliary lens 31. It is done. In addition, although the example which formed the mark 66 in the attachment frame 33 is demonstrated, of course, it does not need to provide in the attachment frame 33, for example, you may provide a mark by printing in the back of a recessed part.
[0044]
As shown in FIG. 12, if the photographer who is the subject is within the angle of view of the auxiliary lens 31 when the lens-fitted photo film unit 10 is held facing the photographer himself during self-photographing, FIG. As shown in FIG. 12A and FIG. 12B, the mark 66 behind the recess 65 can be visually recognized. FIG. 12A shows how the angle-of-view confirmation display unit 63 looks when the photographer is in the center of the angle of view, and FIG. 12B shows that the photographer has entered the end of the angle of view. It shows how it looks when it is. On the other hand, when the photographer is not within the angle of view, the mark 66 cannot be seen as shown in FIG. Since this angle-of-view confirmation display unit 63 can be mounted at a lower cost than the reflection mirror, it is possible to contribute to the cost reduction of the proximity imaging adapter 61.
[0045]
Alternatively, a half mirror may be fitted into the close-up field-of-view frame 41 of the close-up adapter 61 so that it can be used in place of the reflecting mirror.
[0046]
In the above embodiment, the example in which the adapter for close-up photography is detachably attached to the film unit with lens has been described. However, the adapter for close-up photography may be fixedly attached to the film unit with lens. In addition, although the example in which the proximity photographing field frame and the reflection mirror are integrally provided in the adapter main body of the proximity photographing adapter has been described, these may or may not be provided detachably. Although the example in which the dimming plate is provided integrally with the adapter main body has been described, the dimming plate may be detachably attached to the adapter main body.
[0047]
Further, the example in which the close-up adapter is attached to the lens-fitted photo film unit has been described, but it may be attached to a compact camera instead of the lens-fitted photo film unit.
[0048]
【The invention's effect】
As described above in detail, the close-up adapter for use in the present invention uses a light-reducing plate in which a number of holes through which light from the strobe light emitting unit passes is used as a light-shielding plate, The arrangement pattern is arranged so as to be asymmetrical in the vertical and horizontal directions with respect to the horizontal and vertical axes passing through the center of the light-shielding plate. Can be reduced.
[Brief description of the drawings]
FIG. 1 is an external perspective view of a lens-fitted photo film unit equipped with a close-up photographing adapter.
FIG. 2 is a configuration diagram of a proximity photographing adapter.
FIG. 3 is a front view of a proximity photographing adapter.
FIG. 4 is an explanatory diagram of a close-up field frame.
FIG. 5 is a front view of a light reduction plate.
FIG. 6 is an explanatory view showing the diameter and arrangement of the passage holes.
FIG. 7 is an explanatory view showing a mounting posture of the light reduction plate.
FIG. 8 is an explanatory diagram showing a relationship between a light distribution angle and a distance between a light reducing plate and a light emitting surface.
FIG. 9 is an explanatory diagram of a taper of the inner peripheral surface of the passage hole.
FIG. 10 is an explanatory view showing an example of a proximity photographing adapter without a reflecting mirror.
FIG. 11 is an explanatory diagram of a view angle confirmation display unit.
FIG. 12 is an explanatory diagram of how a mark appears according to the direction of a lens-fitted photo film unit.
FIG. 13 is an explanatory view of a dimming plate of a conventional close-up adapter.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Lens unit 11, 61 Close-up adapter 13 Shooting lens 31 Close-up auxiliary lens 32 Adapter main body 33 Mounting frame 41 Close-up field-of-view frame 42 Target ring 43 Reflection mirror 46 Dimming plate 47 Light-shielding plate 48 Passing hole 63 Angle of view Display for confirmation 65 Recess 66 Mark

Claims (7)

A close-up auxiliary lens that is attached to the front of the camera provided with a photographing lens and a strobe light emitting unit and is arranged in front of the photographing lens to change the focus set position to the near distance side, and in front of the strobe light emitting unit. In the adapter for close-up photography provided with a dimming plate arranged,
The light reducing plate is formed by forming a passage hole including a plurality of holes through which light from the strobe light emitting unit passes on the light shielding plate. The passage hole has a horizontal pattern whose arrangement pattern passes through the center of the light shielding plate. It is arranged so as to be asymmetrical in the vertical and horizontal directions with respect to the axis and the vertical axis ,
Further, when the dimming plate is disposed to be inclined with respect to the light emitting surface of the strobe light emitting unit, the area occupied by the passage hole in a region away from the light emitting surface with respect to the horizontal axis is An adapter for close-up photography , wherein the distance is larger than an occupied area of a close region .   The passage hole is composed of a plurality of types of holes having different diameters. Further, when the centers of two adjacent holes are arranged side by side on a straight line parallel to the horizontal axis or the vertical axis, the diameters thereof are The close-up adapter according to claim 1, wherein the adapter is different.   3. The close-up photographing adapter according to claim 1, wherein an inner periphery of the passage hole is tapered so that a front-side diameter is larger than a rear-side diameter of the light reducing plate.   The close-up photography adapter according to any one of claims 1 to 3, wherein a light distribution angle of strobe light obtained by passing through the light reducing plate is matched with a photographing field angle of the close-up auxiliary lens. The front surface of the adapter body is provided with an angle-of-view confirmation display unit for the photographer to check the angle of view during self-photographing. The display unit is disposed at the back of the recess and the photographer. 5. The close-up shooting adapter according to claim 1 , wherein the close-up shooting adapter includes a mark that can be viewed by a photographer when the close-up auxiliary lens is within an angle of view of the close-up auxiliary lens. The adapter for close-up photography according to any one of claims 1 to 4 , wherein the adapter body is provided with a reflection mirror for the photographer to check the angle of view during self-photographing. The adapter body, arranged in front of the finder lens of the camera, characterized in that the close-up vision frame to correct the field of view of the finder lens according to parallax generated during close-up photography is provided according Item 7. The adapter for close-up photography according to any one of items 1 to 6 .

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