JPH1138480A - Close-up photographing adapter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide close-up photographing adapters different in design which can be wealthily collected, without spoiling the extinct effect of strobe light and a photographic characteristic. SOLUTION: An auxiliary lens 44, a half mirror 45 and an extinction plate 47 are attached to an adapter body 31. When this body 31 is positioned in the front surface of a film unit with a lens 20, the above-mentioned members are arranged on the front sides of a photographic lens 23, a finder objective window 24 and a strobe light emitting window 25, respectively. The extinction plate 47 is made of resin having the property of shielding light and in the plate 47, plural holes 48a-48c are formed. The holes 48a-48c are formed to truncated conical shapes, that is, gradually increased in diameter from the back side of the extinction plate 47 to its front side. In the strobe light emitted from the strobe light emitting window 25, a part of a luminous flux is intercepted with the extinction plate 47, to reduce the strobe light and it is irregularly reflected/diffused by the inclined inner peripheries of the holes 48a-48c, to be uniformly projected within a photographing range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adapter which is used by being attached to a camera in which a focus set position is fixed at a normal subject distance and which enables close-up photography.

[0002]

2. Description of the Related Art At present, a great number of types of cameras for photographing are sold according to their uses and functions. Recently, a film unit with a lens has been sold by the present applicant so that photographing can be easily enjoyed. A film unit with a lens is a unit body that incorporates a photographic mechanism such as a photographic lens and a shutter device and has a built-in unexposed photographic film in advance. Because of the simplicity that it can be sent directly to a developing dealer, it is widely used in general. In this film unit with a lens, for example, from a unit incorporating only a basic photographing mechanism such as "Super Photo Run Hi" (trade name), "Super Photo Run is Flas"
h "(product name), etc., equipped with a strobe device to enable shooting at night or indoors.
The user can select one according to the application.

[0003] Recently, the present application has disclosed an adapter that not only allows easy photographing, but also enables a portrait photograph or a close-up photograph of a pet or plant while using a film unit with a lens. Sold by people. This adapter is equipped with an auxiliary lens that changes the focus setting position to a closer distance than usual.This adapter can be used to attach the front of the shooting lens of a film unit with a lens to shoot an object at a close distance. To

FIG. 6 shows a close-up photographing adapter used by being attached to a film unit with a lens. A close-up photographing adapter (hereinafter, simply referred to as an adapter) 10 includes an adapter body 11 and a base 12, and a pair of bendable hinges 13 a, 1 for connecting these.
3b, and is integrally formed of a resin having a light shielding property. The adapter 10 is attached to the front of the lens-fitted film unit 5 such that the base 12 covers the taking lens 6 and the finder objective window 7 exposed on the front of the lens-fitted film unit 5. The base 12 has two exposure openings 14 and 15 for exposing the photographing lens 6 and the finder objective window 7, respectively.

[0005] The adapter body 11 includes hinge portions 13a, 1
With reference to 3b, swinging between a standard position (see FIG. 3 (A)) that is flipped up above the base 12 and a close position (see FIG. 3 (B)) superimposed on the front surface of the base 12 It is free. The adapter body 11 includes an auxiliary lens 16 that changes the focus setting position to a shorter distance side than a normal object distance when used together with the photographing lens 6, a convex half mirror 17 that reflects a part of the object light, Is attached. The adapter main body 11 is integrally provided with a mask portion 18 protruding laterally, and is positioned on the front surface of the strobe light emission window 8 when the adapter main body 11 is positioned at a close position. A plurality of holes 19 are formed in the mask portion 18, and only the light beam that has passed through the hole 19 among the light beams of the strobe light emitted from the strobe light emission window 8 is irradiated on the subject. As a result, the amount of strobe light applied to a subject at a close distance is suppressed, and overexposure is prevented.

When the adapter 10 is attached to the lens-fitted film unit 5 and the adapter main body 11 is positioned at the close position, the auxiliary lens 16 is arranged in front of the taking lens 6 so that the focus setting position is closer to the subject than the normal subject distance. Is changed to As a result, the subject at a close distance is focused, and a sharp image is formed on the photographic film. Also, a mask portion 18 is provided on the front surface of the strobe light emission window 8.
Are arranged, the amount of strobe light emitted from the strobe light emission window 8 and reaching the subject is suppressed, and a subject image with proper exposure is obtained. On the other hand, when the adapter body 11 is positioned at the standard position, the auxiliary lens 16 and the half mirror 1 are moved.
7 and the mask unit 18 are retracted from the front surfaces of the photographing lens 6, the finder objective window 7, and the strobe light emission window 8, respectively, so that photographing can be performed at a normal focus set position.

[0007] Even with such an adapter, it is necessary to prepare various adapters of various colors or those having transparency so that the user can select a desired adapter. Is desired.

[0008]

However, in the adapter 10 having the above-described structure, the mask portion 18 is provided on the adapter body 11.
When a transparent resin having a light transmitting property is used as a molding material of the adapter 10, for example, the mask portion 18 is also configured to be transparent, and the effect of reducing the strobe light can be obtained. Can not be. When a colored resin is used as the molding material, the strobe light that has passed through the mask unit 18 tends to be colored light of the same color as the adapter 10 when performing strobe photography, and the color of the subject is changed. Would.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a close-up photographing adapter capable of providing a variety of different designs without compromising the strobe light dimming effect and photographic properties. The purpose is to:

[0010]

In order to achieve the above object, a close-up photographing adapter according to the present invention is positioned on the front surface of a photographing lens on an adapter body mounted on the front surface of a main body, and the focus set position is normally set. A part of the luminous flux of the strobe light emitted from the strobe light-emitting window, which is made of a resin having a light-shielding property at a position covering the front of the strobe light-emitting window, while fixing the auxiliary lens that changes to a short distance side from the subject distance of And a dimming plate provided with a plurality of holes through which the light passes. The hole formed in the light reducing plate is preferably formed in a truncated conical shape whose diameter gradually increases from the back surface facing the strobe light emission window of the light reducing plate toward the front surface facing the subject.

[0011]

FIG. 5 shows the appearance of a film unit with a built-in strobe and a lens. The lens-fitted film unit 20 is configured by wrapping an exterior label 22 around the center of a unit body 21. The unit body 21 is mainly made of plastic and has a photographing lens 23, a finder objective window 24, and a strobe light emission window 2 on the front.
5, a strobe charging switch 26, and a shutter button 27, a winding knob 28, and a counter window 2
9 are provided. The label 22 is for making the appearance of the lens-fitted film unit 20 beautiful, and has a cosmetic print on the surface. A required portion of the label 22 is provided with an opening for exposing the photographing lens 23, the finder objective window 24, and the counter window 29 provided on the unit main body 21 to the outside. The shooting operation can be performed while the wrapping is performed.

The photographing lens 23 has a focus set position set at a subject distance of about 5 m to 6 m so that photographing can be performed at a subject distance of 1 m to infinity.
Also, a strobe light is emitted from the strobe light emission window 25,
The light amount is set at a subject distance of 1 in consideration of correction at the time of printing.
It is determined that the subjects of m to 4 m have proper exposure. In addition, the light distribution characteristics of the strobe light are determined so that the strobe light is uniformly irradiated within a shooting range at a subject distance of 1 m to 4 m.

FIG. 1 and FIG. 2 show an adapter for close-up photography according to the present invention which is used by being attached to a film unit 20 with a lens. A close-up photographing adapter (hereinafter, simply referred to as an adapter) 30 includes an adapter body 31.
And a base portion 32, a pair of hinge portions 33 a and 33 b for connecting them, and a rubber string 34 for fixing the adapter 30 to the lens-fitted film unit 20. The adapter body 31, the base 32, and the hinges 33a, 33b are integrally formed of resin.

The adapter body 31 has hinge portions 33a,
A pair of through holes 35a and 35b is formed at a position close to 33b. The through-holes 35a and 35b are inserted into the both ends 34a and 34 of the rubber cord 34 from the front side (back side in FIG. 1).
b is inserted, a knot ball is formed on the back side (the front side in FIG. 1), and the rubber string 34 is fixed. Further, a hook 36 for locking a central portion 34c of the rubber cord 34 is provided at an end edge of the base portion 32 opposite to the hinge portions 33a and 33b. The adapter 30 is attached to the front of the lens-fitted film unit 20 so that the base 32 covers the taking lens 23 and the finder objective window 24.
Is turned from the back side of the film unit with lens 20 and is fixed by hooking it on the hook 36.

The hinge portions 33a and 33b are formed to be thinner than the adapter body 31 and the base portion 32.
It is bendable. Thereby, the adapter body 31
Is a standard position (see FIG. 2 (A)) flipped up above the base 32 around the hinge portions 33a and 33b, and a close position (FIG. 2 (B)) superimposed on the front surface of the base 32.
(See Reference). When the adapter 30 is attached to the front of the lens-fitted film unit 20, the adapter body 31 is urged toward the standard position by the tensile force of the rubber cord 35.

The adapter main body 31 and the base 32 are provided with a pair of engaging claws 37a, 37b. Is held in position. A slit 38 is formed around the engaging claw 37b on the side of the base 32, and when the button portion 39 protruding from the front surface of the engaging claw 37b is pressed, the engaging claw 37b bends to form the engaging claw 37a. Is disengaged.

The base 32 has an exposure opening 4 for integrally exposing the photographing lens 23 and the finder objective window 24 which are exposed on the front surface of the film unit 20 with a lens.
0 is formed.

The adapter body 31 has two openings 41, 4
2, and a mask portion 43 protruding laterally is provided integrally. An auxiliary lens 44 is fitted in the opening 41, and a convex half mirror 45 that reflects a part of the subject light is fitted in the opening 42. An opening 46 is formed in the mask portion 43, and a light reducing plate 47 is fitted into the opening 46. Auxiliary lens 4
4, the half mirror 45, and the dimming plate 47, when the adapter 30 is attached to the lens-fitted film unit 20 and the adapter body 31 is positioned at the close position, the photographing lens 2 of the lens-fitted film unit 20 is set.
3. Viewfinder objective window 24 and strobe light emission window 25
Are provided at positions facing each of the above.

The auxiliary lens 44 is for changing the focus setting position to a shorter distance side than the normal object distance, and a lens having a focal length of about 80 mm to 800 mm is used. In the present embodiment, a lens having a focal length of 500 mm is used as the auxiliary lens 44 so as to focus on a position at a subject distance of 0.5 m in consideration of the depth of field when used together with the photographing lens 23.

The half mirror 45 is for confirming the photographing range from the same direction as the subject, and is fitted with the convex surface facing the front side of the adapter body 31. In the half mirror 45, the smaller the radius of curvature of the convex surface is, the wider the area reflected on the half mirror 45 is, and conversely, the larger the radius of curvature is, the narrower the area reflected is. In the present embodiment,
The photographing range at an object distance of 0.5 m is
The radius of curvature was set so as to be exactly reflected on the top 5.

The light reducing plate 47 is injection-molded with a resin having a light-shielding property. As shown in an enlarged manner in FIG.
7 has three types of holes 48a, 48b, and 48 having different sizes.
In the center of the dimming plate 47, the smallest hole 48a is mainly formed, and as the distance from the center increases, larger holes 48b and 48c are formed. As shown in FIG. 4, the holes 48 a to 48 c are formed in a truncated cone shape in which each diameter gradually increases from the back surface 47 b side of the light reducing plate 47 toward the front surface 47 a side. When the light reducing plate 47 is disposed in front of the flash light emitting window 25, it blocks a part of the light beam of the flash light emitted from the flash light emitting window 25, and reduces the amount of the flash light irradiated on the subject. The luminous flux passing through the holes 48a to 48c is converted into the inclined inner circumferential surfaces 49a to 49c of the holes 48a to 48c.
In 9b, the light is diffusely reflected and diffused, and is uniformly irradiated within the photographing range.

Since the amount of light shielding at each part of the light reducing plate 47 is inversely proportional to the area occupied by the holes 48a to 48c, the light shielding amount is greatest at the center where the occupied area is smallest and approaches the peripheral part where the occupied area is largest. Decreases in accordance with Therefore, the size, number, and arrangement of the holes 48a to 48c may be determined according to the amount of strobe light emitted from the strobe light emission window 25, the degree of diffusion, and the distance to the main subject. According to the measurement by the inventors, when flash photography is performed at a subject distance of 1 m to 4 m and the subject emits a quantity of strobe light with a proper exposure,
For a subject having a subject distance of 0.5 m, if the strobe light is reduced within the range of (1/10) to (1/5), a subject image having an exposure amount that does not cause any practical problem can be obtained. Has been confirmed. In addition, if the amount of light emitted from the strobe light emission window 25 at the peripheral portion of the strobe light emission window 25 is 50% or more of the amount of light at the central portion, the shooting range defined as a short distance from the subject distance of 1 m. It was confirmed that the light was irradiated almost uniformly into the inside. Therefore, in the present embodiment, 90% of the strobe light emitted from the strobe light emission window 25 is used.
, And only a 10% amount of strobe light is emitted toward the subject. In addition, the size, number and arrangement of the holes 48a to 48c are determined so that the amount of strobe light passing through the periphery of the light reducing plate 47 is about 65% of the amount of light passing through the center. And FIG.
As shown in FIG. 4, the vertical and horizontal lengths A,
B and thickness C were 14.0 mm and 23.9 m, respectively.
m, 1.5 mm, hole 48 on the back surface 47b side of the light reducing plate 47
The diameters φ1, φ2, φ3 of a to 48c are each 0.8 m
m, 1.8 mm, and 2.3 mm, and the numbers of holes 48a to 48c formed were 8, 10, and 8, respectively. Also,
The arrangement of the holes 48a to 48c is as shown in FIG.

The degree of diffusion of the light beam passing through the holes 48a to 48c depends on the inner peripheral surfaces 49a to 49c of the holes 48a to 48c.
Depending on the inclination angle of c, the degree of diffusion increases as the inclination angle with respect to the optical axis increases. Therefore,
In the present embodiment, the inclination angles θ1, θ2, θ3 of the inner peripheral surfaces 49a to 49c with respect to the optical axis are set to 22.5, respectively.
°, 10.0 °, and 5.0 °.

In the process of manufacturing the close-up photography adapter 30 configured as described above, first, the adapter body 3
The base 32, the hinges 33a and 33b, and the mask 43 are integrally formed of resin. Also, the dimming plate 4
7 is formed of a resin having a light-shielding property.

Next, the openings 41, 4 of the adapter body 31
The auxiliary lens 44, the half mirror 45, and the dimming plate 47 are fitted into the reference numerals 2, 46 from the rear side. After this, elastic cord 3
4 are inserted into the through holes 35a and 35b of the adapter body 31 from the front side, and a knot ball is formed on the back side. Thereby, the rubber string 34 is fixed to the adapter main body 31. The hinges 33a, 33a and 3b are arranged so that the back of the adapter body 31 contacts the surface of the base 32.
The adapter 30 is completed by bending the 3b and engaging the pair of engaging claws 37a, 37b.

Since the dimming plate 47 for strobe light reduction is molded as a separate member from the adapter main body 31 by a resin having a light shielding property, the adapter main body 31 can reduce the strobe light even if the adapter main body 31 does not have a special light shielding property. Can light. In addition, the strobe light is transmitted through holes 48a to 4d formed in the light reducing plate 47.
8c and irradiates the object,
It is only necessary that the surface color of 7 does not affect the strobe light, and the color of the adapter body 31 is not restricted at all. Therefore, the adapter main body 31 can be formed using a colored resin or a resin having transparency, so that a wide variety of adapters 30 can be configured.

The close-up photographing adapter 30 is attached to the front of the film unit 20 with a lens.
1 is moved to the close position, and the engaging claws 37a and 37b are engaged and fixed to the front surface of the base 32. Thus, the auxiliary lens 44, the half mirror 45, and the dimming plate 47 are arranged in front of the photographing lens 23, the finder objective window 24, and the strobe light emission window 25, respectively. When performing flash photography together, the flash charge switch 26
Is pressed to charge the electric charge for strobe light emission.

The photographer has a film unit 2 with a lens.
While holding the camera at 0, the framing is performed while observing the half mirror 45 so that the image of the half mirror 45 fits on the half mirror 45. Thereafter, when the shutter button 27 is pressed, strobe light is emitted from the strobe light emission window 25, and an image of the photographer who has been irradiated with the strobe light is exposed on a photographic film.

At this time, since the auxiliary lens 44 is disposed in front of the photographing lens 23 and the focus setting position is changed to a shorter distance side than the normal object distance, the photographer's face which is the main object is focused. And a sharp image is formed on the photographic film. Also, the strobe light emission window 25
Since the light-attenuating plate 47 having a light-shielding property is arranged in front of the strobe light, a part of the light beam of the strobe light emitted from the strobe light emission window 25 is blocked, and only the light beam that has passed through the holes 48a, 48b, and 48c is the subject. Is irradiated. As a result, the amount of strobe light emitted to the photographer at a short distance is suppressed, and a subject image with proper exposure can be obtained. Also, holes 48a-
48c is formed in the shape of a truncated cone whose diameter increases from the back surface 47b side to the front surface 47a side of the light reducing plate 47, so that it is released from the strobe light emission window 25 and the holes 48a to 48c are formed.
The strobe light passing through the inner peripheral surfaces 49a to 49
The light is diffusely reflected and diffused at c, and is illuminated evenly over the entire area within the photographing range. As a result, a natural subject image is exposed on the photographic film.

For example, when performing close-up photographing of a flower, the photographer sets the adapter body 31 at a close position and then holds the film unit 20 with a lens at a position close to the flower. Then, framing is performed by looking through a finder eyepiece window (not shown). On this occasion,
The half mirror 45 is located in front of the finder objective window 24, but since the half mirror 45 only reflects a part of the subject light, the photographer can view the finder eyepiece window, the finder objective window 24, and the half mirror 45. The image of the flower can be easily confirmed through the half mirror 45, and the half mirror 45 does not hinder the framing. When the shutter button 27 is pressed, a flower image is exposed on the photographic film. Also in this case, since the auxiliary lens 44 is located in front of the photographing lens 23 and the focus setting position has been changed to a shorter distance side than usual, the image of the flower at the closest distance is sharply formed on the photographic film. Imaged.

On the other hand, when performing standard photographing, the photographer presses the button portion 39 provided on the front surface of the engaging claw 37b to release the engagement between the engaging claws 37a and 37b. Engaging claw 37
At the same time as the engagement between the a and 37b is released, the adapter main body 31 is flipped up by the tensile force of the rubber cord 34, and is positioned at the standard position. As a result, the auxiliary lens 44, the half mirror 45, the half mirror 45, and the like from the front of the photographing lens 23, the finder objective window 24, and the strobe light emission window 25.
In addition, the dimming plate 47 is retracted, and photographing at a normal focus set position becomes possible.

In the above embodiment, an example in which three types of holes are formed in the dimming plate has been described. However, the types of holes are not limited to three types, and strobes can be formed by combining more types. The light distribution of light can be further improved. Also in this case, it is preferable that the shape of the hole is formed in a truncated cone shape so that the strobe light is uniformly distributed within the photographing range.

Further, in the above-described embodiment, the case where the close-up photographing adapter is attached to the film unit with the lens is used, but the close-up photographing adapter of the present invention is not limited to the film unit with the lens. The camera can be used for any camera that cannot change the focus set position and cannot perform close-up shooting.

[0034]

As described above, according to the close-up photographing adapter of the present invention, the strobe light emitted from the strobe light-emitting window is made of a resin having a light-shielding property at a position covering the front surface of the strobe light-emitting window of the adapter body. Since a dimming plate having a plurality of holes through which a part of the light beam passes is formed, the strobe light can be diminished even if the adapter body does not have a special light-shielding property. Moreover, the surface color of the light attenuating plate through which the strobe light passes may be any color that does not affect the color of the strobe light, and there is no restriction on the color of the adapter body. Therefore, the adapter main body can be molded using a colored resin or a resin having transparency, and a wide variety of close-up imaging adapters can be configured.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a configuration of a close-up photography adapter of the present invention.

FIGS. 2A and 2B are explanatory views showing a state in which the close-up photographing adapter shown in FIG. 1 is attached to a film unit with a lens; FIG. 2A is a diagram showing a state where the adapter body is in a standard position; FIG. This shows a state in which positioning is performed.

FIG. 3 is an explanatory diagram showing a configuration of a dimming plate.

FIG. 4 is a cross-sectional view of a hole of the light reducing plate shown in FIG. 3;

FIG. 5 is an external view of a film unit with a built-in strobe lens.

6A and 6B are schematic diagrams showing a configuration of a conventional close-up imaging adapter, in which FIG. 6A shows an adapter body in a standard position, and FIG.
Indicates a state in which the adapter body is positioned at the close position.

[Explanation of symbols]

 5, 20 Film unit with lens 6, 23 Photo lens 7, 24 Viewfinder objective window 8, 25 Strobe light emission window 10, 30 Close-up photography adapter 11, 31, Adapter body 12, 32 Base 13a, 13b, 33a, 33b Hinge 16 , 44 Auxiliary lens 17, 45 Half mirror 18, 43 Mask 19, 48a-48c Hole 47 Light-reducing plate 49a-49c Inner peripheral surface

Claims (2)

[Claims] 1. A close-up photography adapter which is detachably mounted on a front surface of a main body in which a strobe light emission window and a photographing lens whose focus set position is fixed at a normal object distance are used. The adapter body mounted on the front of the camera lens is fixed to an auxiliary lens that is positioned in front of the photographing lens and changes the focus setting position to a shorter distance side than the normal subject distance, and the front of the strobe light emission window is fixed. Close-up photographing, characterized in that a light-reducing plate made of a resin having a light-shielding property and having a plurality of holes formed for passing a part of the light beam of the strobe light emitted from the strobe light emission window is attached to a position to be covered. Adapter. 2. A hole formed in the dimming plate is formed in a truncated cone shape whose diameter gradually increases from a back surface of the dimming plate facing the strobe light emission window toward a front surface facing the subject. The adapter for close-up photography according to claim 1, wherein: