JP5761957B2 - Adapter for optical accessories - Google Patents

Description

  The present invention relates to an adapter used for attaching an optical accessory to the tip of a photographing lens.

  Patent Document 1 discloses an adapter for attaching an optical accessory to the tip of a photographing lens. In Patent Document 1, a part of the adapter is engaged with the groove of the taking lens barrel simultaneously with the fastening of the fixing screw member, and the adapter does not fall off even when the fixing screw member loosens unintentionally. A structure has been proposed.

JP 2004-271892 A

However, the adapter disclosed in Patent Document 1 is difficult to provide at low cost because of its complicated structure.
SUMMARY OF THE INVENTION An object of the present invention is to provide an adapter for an optical accessory having a simple structure but having a mechanism that prevents the lens from dropping off.

An exemplary adapter according to the present invention is screwed to one end of two ends of the annular adapter body having a notch and the adapter body forming the notch , and In an adapter for an optical accessory having an operation knob inserted into a hole provided at the other end of the two ends , and an engaging member fixed to the inner diameter side of the adapter body In the adapter body, an opening is formed so that the engaging member can be pressed by the operation knob from the outside of the adapter body, and the operation knob is brought into contact with the operation knob through the opening. The engaging member can be protruded to the inside of the adapter body by pressing the engaging member with the operation knob from the outside of the adapter body. By narrowing the interval of the notch is characterized in that the adapter body is elastically deformable to the inside.

  According to the adapter for an optical accessory of the present invention, a mechanism for preventing the lens from falling off the photographing lens can be realized with a simple structure.

It is a structural diagram of the adapter for optical accessories. It is sectional drawing of the adapter for optical accessories. It is sectional drawing of the latching | locking part of the adapter for optical accessories before fixing to a taking lens. It is sectional drawing of the latching | locking part of the adapter for optical accessories after fixing to a taking lens.

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a structural view of an adapter for an optical accessory according to this embodiment, and FIG. 2 is a cross-sectional view showing a partial cross-sectional configuration.
The adapter for an optical accessory according to the present embodiment is an adapter used to attach an optical accessory such as a wide converter or a teleconverter to the tip of the photographing lens. By attaching the adapter of this embodiment to the front end of the exterior surface of the photographing lens and further attaching the optical accessory to the adapter, various optical accessories can be attached to the photographing lens. That is, the adapter of the present embodiment plays a role of coupling the taking lens and the optical accessory.

  A specific configuration of the adapter will be described with reference to FIGS. 1 and 2. 1 and 2, reference numeral 1 denotes an annular adapter body, and an end portion of the adapter body 1 is provided with a female screw portion 1 a that engages with a male screw provided at an end portion of an optical accessory (not shown). . By screwing the optical accessory into the female thread portion 1a of the adapter main body 1, the adapter main body 1 and the optical accessory can be coupled.

  Next, a configuration relating to fixing of the adapter main body 1 and the photographing lens will be described. The adapter body 1 has an engagement surface 1b that engages with the exterior surface 11a at the tip of the photographing lens 11 shown in FIG. The adapter body 1 has a notch 1c. A tap portion 1d and a hole portion 1e are provided on both sides of the notch portion 1c of the adapter body 1, and an operation knob 2 is inserted into the tap portion 1d and the hole portion 1e. A screw portion 2 a provided on the operation knob 2 is screwed to a tap portion 1 d of the adapter main body 1. The operation knob 2 penetrates the hole 1e of the accessory body 1, and at the same time, the thrust surface 2b of the operation knob 2 is in contact with the end face 1f of the hole 1e.

  As shown in FIG. 2, a slit 1g is provided in the circumferential direction around the notch 1c. As shown in FIG. 1, the slit 1g is provided in a range of about 180 ° with the notch 1c as a substantial center. By providing the adapter body 1 with the notch portion 1c and the slit 1g, the peripheral portions of 1h and 1j of the adapter body 1 corresponding to both sides of the notch portion 1c can be easily elastically deformed in the radial direction. When the operation knob 2 is tightened in such a configuration, the interval between the cutout portions 1c of the adapter main body 1 is narrowed, and at the same time, the engagement surface 1b of the inner diameter portion of the adapter main body 1 is elastically deformed inward to cause the taking lens 11 The exterior surface 11a is held. As a result, the adapter body 1 and the photographing lens 11 are fixed integrally. Conversely, when the operation knob 2 is loosened, the engaging surface 1b of the adapter main body 1 is restored to its original shape, so that the fixing of the adapter main body 1 and the photographing lens 11 is released.

  In the present embodiment, a spacer 3 is provided in the notch 1 c of the adapter 1. This is to prevent the adapter body 1 from being plastically deformed when the operation knob 2 is kept excessively tightened without the adapter body 1 being inserted into the photographing lens. A screw 6 is fixed to the tip of the operation knob 2 to prevent the operation knob from falling off the adapter body 1 when the operation knob 2 is excessively loosened. In this embodiment, the adapter main body 1 can be freely attached to and detached from the photographing lens 11 by operating the operation knob 2 quickly and easily with one hand.

  Next, a structure for suppressing the drop-off of the adapter body 1 from the photographing lens 11 will be described. In the present embodiment, the adapter main body 1 is structured not to fall out of the photographing lens 11 even if the operation knob 2 is unintentionally loosened during use of the photographing lens 11. With this structure, even if the operation knob 2 is loosened while photographing with the photographing lens 11 facing downward, damage to the optical accessory due to dropping can be prevented.

  Reference numeral 4 denotes an engaging member fixed to the inner diameter side of the adapter main body 1. The engaging member 4 has a simple arc shape as shown in FIG. Only the end of the engaging member 4 is fixed to the adapter body 1 with screws 5. The adapter body 1 is provided with an opening 1k that connects the outside and the inside of the adapter body 1. When the operation knob 2 is screwed in, a part 2 c of the operation knob 2 passes through the opening 1 k from the outside of the adapter 1 and presses the engagement member 4 inward while contacting the engagement member 4. As a result, the engaging member 4 is elastically deformed with the screw 5 as a fulcrum and protrudes inward.

  3 and 4 are cross-sectional views showing an engaged state of the adapter main body 1 and the photographic lens 11. 3 shows a state in which the operation knob 2 is loosened, and FIG. 4 shows a state in which the operation knob 2 is tightened. In FIG. 3, the inner diameter surface 1 b of the adapter body 1 is engaged with the exterior surface 11 a of the photographing lens 11, but the engaging member 4 is disposed slightly outside the exterior surface 11 a of the photographing lens 11. For this reason, when the adapter 1 is attached to the lens 11, it can be smoothly attached without being caught on the way. In FIG. 4, the adapter body 1 holds the exterior surface 11 a of the photographing lens 11, and at the same time, the engaging member 4 is elastically deformed inward and is engaged with a groove 11 b provided in the photographing lens 11. . In the state of FIG. 4, since the engaging member 4 is inside the exterior surface 11 a of the photographic lens 11, the adapter body 1 does not fall out of the photographic lens 11 even when the operation knob 2 is slightly loosened. That is, even when the operation knob 2 is unintentionally loosened, it is possible to prevent the optical accessory from being dropped and damaged together with the adapter body 1. When the operation knob 2 is further loosened, the elastically deformed locking member 4 is restored to its original position, so that the state shown in FIG. 4 is changed to the state shown in FIG. Is possible.

  The adapter in this embodiment is basically composed of three parts, that is, an adapter main body 1, an operation knob 2, and an engaging member 4, and each part has a simple shape. With the configuration of these three basic parts, the adapter body 1 has excellent operability that can be attached to and detached from the photographing lens with one hand, and can prevent the adapter main body 1 from falling off due to loosening of the fixing operation knob at a low cost.

  In this embodiment, the optical accessory is fixed to the photographing lens by attaching an adapter to the tip of the exterior surface of the photographing lens and further attaching the optical accessory to the adapter. However, the optical accessory and the adapter main body 1 of the present embodiment can be configured integrally. However, since the optical accessory and the adapter are divided into two parts as in the present embodiment, an operation method for attaching a plurality of optical accessories to one adapter at any time is possible. There is an advantage that can be prepared at low cost.

DESCRIPTION OF SYMBOLS 1 Adapter main body 2 Operation knob 4 Engagement member 11 Shooting lens

Claims (3)

An annular adapter body formed with a notch, and
Screwed into one end of the two ends of the adapter body forming the notch , and inserted into a hole provided at the other end of the two ends. and the operation knob that,
In an adapter for an optical accessory having an engagement member fixed to the inner diameter side of the adapter body,
The adapter body is formed with an opening so that the engaging member can be pressed from the outside of the adapter body with the operation knob.
By operating the operation knob, the engagement member that is in contact with the operation knob through the opening is pressed from the outside of the adapter body by the operation knob, so that the engagement member is moved to the inside of the adapter body. An adapter that is capable of projecting and that is capable of elastically deforming the adapter body inward by narrowing the interval between the notches.   The notch portion is located between the tap portion to which the operation knob is screwed, a hole portion into which the operation knob is inserted, the tap portion and the hole portion, and is elastic to the inside of the adapter body. The adapter according to claim 1, further comprising a spacer into which the operation knob is inserted to limit deformation.   The adapter according to claim 1, wherein the adapter is integrally formed with the optical accessory.

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