JP4329509B2 - adapter - Google Patents

Description

  The present invention relates to an adapter used when an auxiliary lens is connected to a subject side of a photographing lens of a camera.

2. Description of the Related Art Conventionally, a lens shutter type camera (particularly, a digital still camera) is generally configured such that a lens barrel of a photographing lens is integrated with a camera housing and cannot be removed. For this reason, various auxiliary lenses (also called converter lenses) are prepared to shoot beyond the capabilities of the photographic lens mounted on the camera, such as telephoto and wide-angle, and these auxiliary lenses are attached to the subject side of the photographic lens. Adapters (also called adapter rings) are provided. This adapter is generally composed of a cylindrical member having connection means for connecting a camera and an auxiliary lens (see, for example, Patent Document 1).
JP 2000-162893 A

  However, since the conventional adapter is formed of a simple cylindrical member, the light transmitted through the auxiliary lens connected to the subject side of the photographing lens is reflected by the end surface portion other than the lens on the subject side end surface of the photographing lens. There is a risk of returning to the auxiliary lens side, being reflected by the lens surface of the auxiliary lens, and returning to the photographing lens again to become stray light.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an adapter capable of preventing stray light generated at an end surface portion other than the lens on the subject side end surface of the photographing lens.

In order to achieve the above object, the present invention provides an adapter for connecting an auxiliary lens in front of a subject side of a photographing lens, wherein the adapter is a subject of the photographing lens between the photographing lens and the auxiliary lens. There is a projection that covers the end surface portion with characters other than the lens on the side end surface, the projection comprises an iris diaphragm, and the inner peripheral surface of the adapter and the iris diaphragm are subjected to stray light prevention processing. An adapter is provided.
In the adapter of the present invention, it is preferable that the iris diaphragm is formed separately from the adapter.

  In the adapter according to the aspect of the invention, it is preferable that the protrusion is formed integrally with the adapter.

  Moreover, in the adapter of this invention, it is preferable that the said projection part is formed separately from the said adapter.

Further, the present invention provides an adapter for connecting an auxiliary lens in front of the photographing lens on the subject side, wherein the adapter is provided between the photographing lens and the auxiliary lens other than the lens on the subject side end surface of the photographing lens. The adapter has a protrusion covering the end surface portion, the inner peripheral surface of the adapter and the protrusion portion are subjected to stray light prevention treatment, and an expansion / contraction member is provided between the end surface portion and the protrusion portion, and the expansion / contraction The member expands and contracts according to the movement of the photographic lens, and one end of the expandable member covers the end surface portion.

  In the adapter according to the aspect of the invention, it is preferable that the iris diaphragm is connected to the photographing lens by an interlocking lever, and the opening of the iris diaphragm is changed according to the movement of the photographing lens.

  In the adapter of the present invention, an expansion / contraction member is provided between the end surface portion and the protrusion, the expansion / contraction member expands / contracts according to the movement of the photographing lens, and one end portion of the expansion / contraction member is the end surface. It is preferable to cover the part.

  In the adapter according to the aspect of the invention, it is preferable that the elastic member is a bellows-like member.

Further, the present invention is in the adapter to connect the auxiliary lens on the object side in front of the taking lens, other than the lens of the object side surface of the imaging lens, the light shielding member preventing stray light processing covering the end face portions of which character is made The adapter is slidably fitted to the inner peripheral portion of the adapter, and the light shielding member moves according to the movement of the photographing lens.

  In the adapter of the present invention, it is preferable that the light shielding member is pressed against the end surface portion by an elastic member.

  The present invention can provide an adapter capable of preventing stray light generated at an end surface portion other than the lens on the subject side end surface of the photographing lens.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a partial cross-sectional view of a schematic configuration of a camera equipped with an adapter according to a first embodiment of the present invention. FIG. 2 is a schematic view of the camera taking lens as seen from the front. FIG. 3 is a partial cross-sectional view of a schematic configuration of a camera equipped with an adapter according to a second embodiment of the present invention. FIG. 4 is a partial cross-sectional view of a schematic configuration of a camera equipped with an adapter according to a third embodiment of the present invention. FIG. 5 is a partial sectional view of a schematic configuration of a camera equipped with an adapter according to a fourth embodiment of the present invention. FIG. 6 is a partial sectional view of a schematic configuration of a camera equipped with an adapter according to a fifth embodiment of the present invention.

(First embodiment)
Hereinafter, the adapter according to the first embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a schematic partial sectional view of a camera equipped with an adapter according to a first embodiment of the present invention, and FIG. 2 shows a schematic view of a camera taking lens as seen from the front.

  In FIG. 1, a photographic lens 2 that can be extended and retracted is integrally assembled in a camera casing 1, and the photographic lens 2 is changed from a wide-angle end state to a telephoto end state according to a photographer's instruction (button operation not shown). The photographic lens 2 moves so as to be extended or retracted, and the photographic lens 2 is retracted and accommodated in the housing 1 when photographing is completed.

  An adapter support portion 4 that supports a cylindrical adapter 3 used to dispose the auxiliary lens 5 on the subject side of the photographing lens 2 is disposed on the outer peripheral portion of the photographing lens 2 of the housing 1. ing. A screw portion 4 a that is screwed with a screw portion 3 a provided on the outer peripheral portion of the adapter 3 is formed on the inner peripheral portion of the adapter support portion 4. By screwing the screw portion 3a of the adapter 3 into the screw portion 4a of the adapter support portion 4, the adapter 3 is screwed to the housing 1, and the auxiliary lens 5 is supported on the subject side of the photographing lens 2.

  Further, on the auxiliary lens 5 side of the adapter 3, a screw portion 3 b that is screwed with the screw portion 5 a of the auxiliary lens 5 is formed on the inner peripheral portion of the adapter 3, and the screw portion 5 a of the auxiliary lens 5 is connected to the adapter 3. The auxiliary lens 5 is supported on the subject side of the photographing lens 2 by being screwed into the screw portion 3b. In addition, as a method for fixing the adapter 3 to the housing 1, a method other than screwing with a screw can be used.

  As shown in FIG. 2, an object side end surface of the taking lens 2 has a lens 2a and an end surface portion 2b that is a part of a lens barrel that holds the lens 2a. On the surface of the end face 2b, characters indicating the lens name 2c of the photographing lens 2, the focal length 2d of the photographing lens 2, and the like are printed in white or the like. Of the reflected light from the subject incident on the photographic lens 2, the light reflected by the end face portion 2 b with this letter does not matter when the subject side of the photographic lens 2 is open, but an optical member such as the auxiliary lens 5 is used. When mounted in front of the photographic lens 2, the reflected light from the end surface 2 b may be reflected by the lens surface 5 b (see FIG. 1) of the auxiliary lens 5 and return to the photographic lens 2 and become stray light.

  As shown in FIG. 1, a projection 6 is formed on the inner peripheral portion of the adapter 3 between the auxiliary lens 5 and the photographing lens 2 so as to cover the end surface portion 2 b of the photographing lens 2 on the auxiliary lens 5 side. In this way, the adapter 3 according to the first embodiment is formed.

  The adapter according to the first embodiment is incident on the photographing lens 2 from the auxiliary lens 5 by providing a projection 6 for light shielding on the inner periphery of the adapter 3 between the auxiliary lens 5 and the photographing lens 2. The light incident on the end surface 2b of the taking lens 2 is cut by scattering or absorbing the light, and the light incident from the auxiliary lens 5 is reflected by the end surface 2b and enters the lens surface 5b of the auxiliary lens 5. It also has the role of cutting by scattering or absorbing light, and is reflected by the end surface 2b of the photographic lens 2 to return to the photographic lens 2 so that light that becomes stray light can be cut.

  In addition, the diameter of the opening of the protrusion 6 is such that the luminous flux from the auxiliary lens 5 is formed to have a Kerarenai diameter when the photographic lens 2 is in the wide-angle end state (the end surface portion 2b of the photographic lens 2 is located closest to the housing). It is. In the camera according to the present embodiment, the moving distance of the end surface portion 2b of the photographic lens 2 from the wide-angle end state to the telephoto end state is about several millimeters (3 to 5 mm), and the protrusion 6 is thus formed. Even when the taking lens 2 is in the telephoto end state, the luminous flux from the auxiliary lens 5 does not become vignetting. Thereby, incident light and reflected light at the end surface 2b of the photographing lens 2 can be cut, and stray light incident on the photographing lens 2 can be cut.

  Further, the inner periphery of the adapter 3 and the surface of the protrusion 6 are subjected to processing for scattering or absorption of light, such as matte coating or black alumite processing.

(Second Embodiment)
Next, an adapter according to a second embodiment of the present invention will be described with reference to the drawings. The difference between the second embodiment and the first embodiment is that the adapter having the protrusion is formed separately from the adapter connected to the housing. The same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  FIG. 3 is a partial cross-sectional view of a schematic configuration of a camera equipped with an adapter according to a second embodiment of the present invention.

  In FIG. 3, a known cylindrical first adapter 13 is screwed and supported by a screw portion 13a on a screw portion 4a of an adapter support portion 4 of a camera casing 1. A threaded portion 13 b for supporting the auxiliary lens 5 is formed at the subject side end of the first adapter 13.

  Between the auxiliary lens 5 and the first adapter 13, a second adapter 23 having a projection 6 similar to that of the first embodiment is disposed on the inner periphery. On the outer peripheral portion of the second adapter 23 on the first adapter 13 side, there is a screw portion 23a that is screwed with the screw portion 13b of the first adapter 13 and supports the second adapter 23 to the first adapter 13. Is formed.

  In addition, a screw portion 23 b that is screwed into the screw portion 5 a of the auxiliary lens 5 and supports the auxiliary lens 5 is formed on the inner peripheral portion of the second adapter 23 on the auxiliary lens 5 side.

  Between the auxiliary lens 5 and the photographing lens 2, a second adapter 23 is connected to the housing 1 via the first adapter 13 to support the auxiliary lens 5 in front of the photographing lens 2. In this manner, the (second) adapter 23 according to the second embodiment is formed.

  When the (second) adapter 23 according to the second embodiment is connected to the subject side of the first adapter 13, a projection 6 that covers the subject-side end surface 2 b of the photographic lens 2 is provided. . The configuration, action, and effect of the protrusion 6 are the same as those in the first embodiment, and a description thereof will be omitted.

  Note that the (second) adapter 23 may be a step-up ring. Generally, when the diameter of the threaded portion 5a of the auxiliary lens 5 is larger or smaller than the diameter of the threaded portion 13b of the first adapter 13, a step-up ring for converting the diameter is used. By providing the protrusion 6 on the step-up ring on the side of the taking lens 2 and screwing it into the first adapter, the same action and effect can be obtained.

(Third embodiment)
Next, an adapter according to a third embodiment of the present invention will be described with reference to the drawings. The difference between the third embodiment and the first embodiment is that an expansion / contraction member is disposed between the protrusion and the end surface of the photographing lens, and the protrusion and the photographing lens are moved when the photographing lens is moved by a zoom operation. It is in the point which shielded the crevice between. The same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  FIG. 4 is a partial cross-sectional view of a schematic configuration of a camera equipped with an adapter according to a third embodiment of the present invention.

  In FIG. 4, one end surface portion 7 b of the elastic member 7 is attached to the surface on the photographing lens 2 side of the projection 6 provided between the photographing lens 2 and the auxiliary lens 5 on the inner peripheral portion of the adapter 3. It is fixed with. The telescopic member 7 is, for example, a bellows-like member, and the other end portion 7 a is pressed by the subject-side end surface portion 2 b (see FIG. 2) of the photographing lens 2 to cover the end surface portion 2 b. It is configured to expand and contract along with the movement by the zoom operation and always cover the end face 2b.

  In the third embodiment, the expansion / contraction member 7 is disposed between the projection 6 of the adapter 3 and the end surface 2b of the photographing lens 2, and the end surface 7a of the expansion / contraction member 7 is end surface regardless of the movement of the photographing lens 2. Since the portion 2b is always covered, light that has passed through the auxiliary lens 5 is incident on and reflected by the end surface portion 2b, is reflected by the lens surface 5b of the auxiliary lens 5, and is prevented from returning to the photographing lens 2 as stray light. I can do it.

  The elastic member 7 may be an elastic member other than a bellows-like member. Moreover, the fixing method of the end surface part of the expansion / contraction member 7 to the projection part 6 is not limited to the adhesive material, and may be another method such as a screw or a pin. Further, when the photographing lens 2 is stored in the housing 1 after photographing, the end surface 7 a of the telescopic member 7 may be configured to be separated from the end surface portion 2 b of the photographing lens 2. What is necessary is just to design the expansion-contraction amount of the expansion-contraction member 7 with the characteristic of an expansion-contraction member. In addition, the elastic member 7 is configured to be subjected to antireflection processing such as matte coating so that unnecessary stray light does not occur.

  Further, in the adapter according to the third embodiment, the protruding portion 6 having the elastic member 7 is formed as a separate second adapter similarly to the second embodiment, and is attached to the known first adapter. The same effect can be achieved with a configuration that is used.

(Fourth embodiment)
Next, an adapter according to a fourth embodiment of the present invention will be described with reference to the drawings. The difference between the fourth embodiment and the first embodiment is that the projection of the first embodiment is changed to an iris diaphragm so that the aperture diameter can be varied according to the movement of the photographing lens. The same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  FIG. 5 is a partial sectional view of a schematic configuration of a camera equipped with an adapter according to a fourth embodiment of the present invention.

  In FIG. 5, an iris diaphragm 34 that covers the end surface 2 b of the photographic lens 2 is disposed between the photographic lens 2 and the auxiliary lens 5 on the inner periphery of the adapter 33 that is screwed into the adapter support 4 of the housing 1. Has been. The iris diaphragm 34 and the notch 36 a of the tube portion 36 of the lens barrel of the photographing lens 2 are connected by an interlocking lever 35. The tube portion 36 is rotated by the zoom operation of the photographing lens, and this rotation is transmitted to the iris diaphragm 34 via the interlocking lever 35, so that the aperture diameter of the iris diaphragm 34 changes. The aperture diameter of the iris diaphragm 34 is large in the wide-angle end state and small in the telephoto end state. In this way, the adapter 33 according to the fourth embodiment is formed.

  In the fourth embodiment, the aperture diameter of the iris diaphragm 34 changes according to the zoom operation of the photographing lens 2, covers the end surface 2b of the photographing lens 2, and the light from the auxiliary lens 5 enters the end surface 2b. It is possible to prevent the light from being reflected and reflected from the lens surface 5b of the auxiliary lens 5 to return to the photographing lens 2 and become stray light.

  Also in the fourth embodiment, the same expansion and contraction member as in the third embodiment is provided between the end surface portion 34a of the iris diaphragm 34 and the end surface portion 2b of the photographing lens 2 so as to always cover the end surface portion 2b. It is also possible to configure.

  Further, the same effect can be obtained even if the iris diaphragm 34 is formed as a separate second adapter similar to that of the second embodiment and connected to a known first adapter.

(Fifth embodiment)
Next, an adapter according to a fifth embodiment of the present invention will be described with reference to the drawings. The difference between the fifth embodiment and the third embodiment is that, instead of the telescopic member of the third embodiment, a light-shielding member having a projection that covers the end face of the photographic lens is changed in the adapter according to the movement of the photographic lens. The peripheral portion is slidably arranged. The same components as those in the third embodiment are denoted by the same reference numerals, and description thereof is omitted.

  FIG. 6 is a partial sectional view of a schematic configuration of a camera equipped with an adapter according to a fifth embodiment of the present invention.

  In FIG. 6, a cylindrical light shielding member 44 having a projection 44 a that covers the end surface 2 b of the photographic lens 2 on the inner peripheral portion of the adapter 43 that is screwed to the adapter support portion 4 of the housing 1. It is slidably arranged on the periphery. A stopper 46 is provided in the vicinity of the end surface of the adapter 43 on the auxiliary lens 5 side. A spring member 45 that presses the light shielding member 44 toward the photographing lens 2 is provided between the stopper 46 and the light shielding member 44, and the projection 44 a of the light shielding member 44 is formed on the end surface portion 2 b according to the zooming operation of the photographing lens 2. It is comprised so that it may always press. Needless to say, the entire light shielding member 44 is subjected to antireflection processing such as matte coating.

  In the fifth embodiment, the light shielding member 44 covering the end surface 2b is always pressed against the end surface 2b of the photographing lens 2 by the spring member 45, so that the light from the auxiliary lens 5 is reflected by the end surface 2b and assists. It is possible to prevent stray light from being reflected by the lens surface 5 b of the lens 5 and entering the photographing lens 2.

  The spring member 45 can achieve the same effect even when an elastic member such as rubber is used.

  In addition, the protrusion part in the said embodiment may be formed in the ring shape which covers the end surface part of a photographic lens, or only the high reflectance part (for example, white character part) of a part of end surface part is provided. You may form in the circular arc shape which covers.

  The above-described embodiment is merely an example, and is not limited to the above-described configuration or shape, and can be appropriately modified and changed within the scope of the present invention.

1 is a partial sectional view of a schematic configuration of a camera equipped with an adapter according to a first embodiment of the present invention. The schematic diagram which looked at the imaging lens of the camera from the front is shown. The schematic structure partial cross section figure of the camera with which the adapter concerning 2nd Embodiment of this invention was mounted | worn is shown. The schematic structure partial cross section figure of the camera with which the adapter concerning 3rd Embodiment of this invention was mounted | worn is shown. The schematic structure partial cross section figure of the camera with which the adapter concerning 4th Embodiment of this invention was mounted | worn is shown. The schematic structure fragmentary sectional view of the camera equipped with the adapter concerning a 5th embodiment of the present invention is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Case 2 Shooting lens 3 Adapter 4 Adapter support part 5 Auxiliary lens 6 Protrusion part 7 Telescopic member 13 1st adapter 23 2nd adapter 33 Adapter 34 Iris diaphragm 35 Interlocking lever 36 Tube part 43 Adapter 44 Light-shielding member 45 Spring member 46 Stopping part

Claims (9)

In an adapter for connecting an auxiliary lens in front of the subject side of the photographic lens,
The adapter has a protrusion between the photographing lens and the auxiliary lens that covers an end surface portion with characters other than the lens on the subject side end surface of the photographing lens,
The protrusion comprises an iris diaphragm,
The adapter, wherein the inner peripheral surface and the protrusion of the adapter are subjected to stray light prevention treatment. The iris diaphragm is connected to the photographic lens by an interlocking lever,
The adapter according to claim 1 , wherein an aperture of the iris diaphragm changes according to movement of the photographing lens. An elastic member is provided between the end surface portion and the protrusion,
The elastic member is stretchable in response to movement of the photographing lens, the adapter according to claim 1 or 2 one end of the telescopic member is characterized in that for covering the end face portion. In an adapter for connecting an auxiliary lens in front of the subject side of the photographic lens,
The adapter has a protrusion between the photographing lens and the auxiliary lens that covers an end surface portion with characters other than the lens on the subject side end surface of the photographing lens,
The inner peripheral surface and the protrusion of the adapter are subjected to stray light prevention treatment ,
An elastic member is provided between the end surface portion and the protrusion,
The expansion / contraction member expands / contracts according to the movement of the photographic lens, and one end of the expansion / contraction member covers the end surface portion. The adapter according to claim 3 or 4, wherein the elastic member comprises a bellows-like member. The protrusions adapter according to claim 1, any one of 5, characterized in that it is integrally formed with said adapter. The adapter according to claim 1, wherein the protrusion is formed separately from the adapter. In an adapter for connecting an auxiliary lens in front of the subject side of the photographic lens,
Other than the lens on the subject-side end surface of the photographing lens, a light-shielding member that has been subjected to stray light prevention processing that covers an end surface portion with characters is slidably fitted to the inner peripheral portion of the adapter,
The adapter, wherein the light shielding member moves in accordance with the movement of the photographing lens.   The adapter according to claim 8, wherein the light shielding member is pressed against the end surface portion by an elastic member.

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