JP2017146368A - Accessory and optical instrument attachable therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an accessory capable of further preventing image quality from deteriorating due to an illumination device disposed at a lens tip, and an optical instrument attachable therefor.SOLUTION: An accessory is attachable to an optical instrument having an illumination device at a tip thereof. The accessory includes: an opening configured to guide light from a subject to the optical instrument when the accessory is attached to the optical instrument; and a light source shield part having a width wider than that of a light emission part of the illumination device in a cross section including an optical axis of the optical instrument, and covering the entire light emission part of the illumination device in an optical axis direction view of the optical instrument, when the accessory is attached to the optical instrument.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an accessory and an optical apparatus to which the accessory can be attached.

  In recent years, Patent Document 1 discloses a lens in which an illumination device such as a strobe is provided at the tip of a lens so that the amount of illumination light is not short at the time of macro photography in which a photograph is taken close to a small subject.

  In Patent Document 1, a light-shielding plate provided with a plurality of light-shielding portions is rotatably provided in front of a ring-shaped strobe that can be attached to the lens tip, and the light-shielding plates are rotated to cover a part of the light-emitting portions. A configuration capable of adjusting the amount of light from the strobe is disclosed.

JP-A-10-274799

  Here, when macro photography is performed on an object with high reflectance such as glass using a lens provided with an illumination device at the tip, the light reflected on the surface of the illumination device is photographed even if the illumination device at the tip of the lens is not emitting light. The image quality may deteriorate.

  In the configuration disclosed in Patent Document 1, a part of the light emitting unit can be covered by rotating the light shielding plate, but the entire light emitting unit cannot be covered, so that the above-described deterioration in image quality is sufficiently suppressed. Can not do it.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an accessory that can further suppress deterioration in image quality due to an illumination device provided at the tip of a lens, and an optical device that can be equipped with the accessory.

In order to solve the above problems, the accessory of the present invention provides:
An accessory that can be attached to an optical device having a lighting device at the tip,
An opening for guiding light from a subject to the optical device when the accessory is attached to the optical device;
When the accessory is mounted on the optical device, the cross section including the optical axis of the optical device has a width wider than the width of the light emitting unit of the illumination device, and the illumination is viewed in the optical axis direction of the optical device. A light source shading unit that covers the entire light emitting unit of the device,
It is characterized by that.

  ADVANTAGE OF THE INVENTION According to this invention, the accessory which can suppress deterioration of the image quality by the illuminating device provided in the lens front-end | tip more, and an optical apparatus which can mount this can be provided.

It is sectional drawing of the imaging system of a present Example. It is a system block diagram of the imaging system shown in FIG. It is a disassembled perspective view of the LED light part of a present Example. It is a figure showing the imaging | photography state of the imaging system of a present Example. It is sectional drawing of the retracted state of the imaging system of a present Example. It is a figure showing the retracted state and imaging | photography state of the imaging system of a present Example. It is a figure showing the lens hood of a present Example.

  Preferred embodiments of the present invention will be illustratively described below with reference to the drawings. However, the relative arrangement of the component parts described in this embodiment should be appropriately changed according to the configuration of the apparatus to which the present invention is applied and various conditions. That is, the present invention is not limited to the embodiments described later, and various modifications and changes can be made within the scope of the gist.

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

(Configuration of lens device and imaging device)
FIG. 1 is a cross-sectional view of an imaging apparatus (imaging system) including an interchangeable lens 200 (lens apparatus) and a camera body 500. From now on, the left side (front side) of FIG. 1 will be described as the object side, and the right side (rear side) of FIG.

  The interchangeable lens (lens unit) 200 is an optical device configured to be detachable from the camera body 500. The camera body 500 is configured as a mirrorless camera (imaging device) in the present embodiment, but may be configured as a single-lens reflex camera. The present invention is applicable not only to digital still cameras but also to digital video cameras and lens-integrated cameras.

  The interchangeable lens 200 has a photographing optical system that forms an optical image of a subject. The interchangeable lens 200 of the present embodiment is a single focus macro lens capable of close-up photography. As shown in FIG. 5 to be described later in the non-photographing state, a retractable mechanism by manual operation is provided so that the total lens length can be reduced and carried compactly. At the tip of the interchangeable lens 200, an LED light unit (illuminating device) for securing a light amount mainly at the time of close-up photography is provided. The configuration of the LED light unit will be described later with reference to FIG.

  The photographic optical system of the present embodiment has a first lens group 1, an anti-vibration lens 2, and a focus lens 3 as lens units, and further includes a protective glass 4 and an aperture unit 34. In other words, the interchangeable lens 200 is a lens device that includes a lens unit configured such that the distance between adjacent lens units changes during zooming or focusing. In this embodiment, the configuration in which the protective lens 4 is provided is illustrated. However, instead of the protective lens 4 having a flat surface, a lens unit having a plurality of lenses or a single lens may be provided as a two-group lens.

  Reference numeral 5 denotes a first group barrel that holds the first group lens 1. The image stabilization lens 2 corrects image blur by moving in a direction perpendicular to the optical axis, and is held by the image stabilization device 8. The vibration isolator 8 is fixed in the first group barrel 5. In this embodiment, the first lens unit 1 is a lens unit that does not move during zooming or focusing.

Reference numeral 11 denotes a main barrel, and the first group barrel 5 and the aperture unit are fixed to the main barrel.
Reference numeral 10 denotes a focus lens barrel that holds a focus lens 3 that moves in the optical axis direction of the interchangeable lens 200 during focusing. The focus lens barrel 10 is moved in the optical axis direction by a guide mechanism and a drive mechanism provided in the main lens barrel 11 to be focused. Make adjustments. The aperture unit 34 adjusts the amount of light and is fixed to the main barrel 11.

  Reference numeral 14 denotes a guide tube (guide member), which is provided with a plurality of guide grooves (in this embodiment, parallel to three optical axes in the circumferential direction). Reference numeral 16 denotes an operation ring, which is provided with a cam groove for extending the main barrel from the retracted state. The operation ring 16 is attached to the guide tube 14 so that the movement in the optical axis direction is restricted by bayonet coupling and is rotatable. When the operation ring 16 rotates in the main barrel 11, the cam follower provided in the main barrel 11 slides along the guide groove and moves in the optical axis direction. Note that a decorative ring 35 is bonded to the operating ring 16 as a cover for protecting the operating ring 16, and when the decorative ring 35 is rotated, the operating ring 16 also rotates.

  Reference numeral 31 denotes a printed circuit board on which a lens driving IC, a microcomputer, and the like are arranged, and is fixed to the guide tube 14. 27 is an external ring, 32 is a mount made by resin molding, and a protective glass 4 is attached to the mount 32. The mount 32 is screwed to the guide tube 14. The appearance ring 27 is fixed between the guide tube 14 and the mount 32. Reference numeral 19 denotes a manual focus (MF) ring, which is supported so as to be rotatable about the guide cylinder 14. When the MF ring 19 is rotated, a sensor (not shown) detects the rotation and performs manual focus adjustment according to the rotation amount.

  The interchangeable lens 200 having such a configuration is bayonet-fixed to the camera body 500 by the mount 32. When the interchangeable lens 200 is fixed to the camera body 500 with the mount 32, the printed circuit board 31 that controls the operation of each lens can communicate with the camera body 500 through a contact block (not shown).

  Reference numeral 600 denotes an imaging element mounted on the camera body 500, which is a photoelectric conversion element such as a CMOS or CCD that photoelectrically converts an optical image formed by the photographing optical system.

(Electrical configuration of imaging device)
FIG. 2 is a block diagram illustrating an electrical configuration of the imaging system.

  Reference numeral 501 denotes a camera CPU (camera control means) constituted by a microcomputer, which controls the operation of each unit in the camera body 500. The camera CPU 501 communicates with the lens CPU 201 (lens control means) of the interchangeable lens 200 via the electrical contacts 502 and 202 when the interchangeable lens 200 is mounted.

  Information (signals) transmitted from the camera CPU 501 to the lens CPU 201 includes drive amount information, parallel shake information, and out-of-focus information of the focus lens 3. Information (signal) transmitted from the lens CPU 201 to the camera CPU 501 includes imaging magnification information. The electrical contacts 502 and 202 include contacts for supplying power from the camera body 500 to the interchangeable lens 200.

  A power switch 503 that can be operated by the photographer is a switch for starting the camera CPU 501 and starting power supply to each actuator, sensor, and the like in the camera system.

  Reference numeral 504 denotes a release switch that can be operated by the photographer, and includes a first stroke switch SW1 and a second stroke switch SW2. A signal from the release switch 504 is input to the camera CPU 501. The camera CPU 501 enters a shooting preparation state in response to an ON signal input from the first stroke switch SW1. In the shooting preparation state, measurement of subject brightness by the photometry unit 505 and focus detection by the focus detection unit 506 are performed. The camera CPU 501 calculates the aperture value of the aperture unit 34, the exposure amount of the image sensor 600 (in shutter seconds), and the like based on the photometric result.

  Based on the focus detection result (defocus amount and defocus direction) by the focus detector 506, the camera CPU 501 drives the focus lens 3 and the focus barrel 10 (including the drive direction) to obtain a focused state for the subject. ). Information on the driving amount (focus lens driving amount information) is transmitted to the lens CPU 201. The lens CPU 201 controls the operation of each component of the interchangeable lens 200.

  The camera CPU 501 controls image stabilization by the image stabilization device 8. When the ON signal from the second stroke switch SW2 is input, the camera CPU 501 transmits an aperture drive command to the lens CPU 201 to set an aperture value via the aperture unit 34. Further, the camera CPU 501 transmits an exposure start command to the exposure unit 507, causes the mirror (not shown) to be retracted and the shutter (not shown) to be opened, and exposes the imaging unit 508 including the imaging element 600.

  An image pickup signal from the image pickup unit 508 (image pickup element 600) is digitally converted by a signal processing unit in the camera CPU 501, subjected to various correction processes, and output as an image signal. An image signal (data) is recorded and stored in a recording medium such as a semiconductor memory such as a flash memory, a magnetic disk, or an optical disk in an image recording unit 509.

  Reference numeral 204 denotes an MF ring rotation detection unit, which includes the MF ring 19 and its rotation detection unit. Reference numeral 205 denotes an operation ring rotation detection unit, which includes an operation ring 16, a decorative ring 35, and a sensor (not shown) that detects the rotation of the operation ring 16. The operation ring rotation detection unit 205 detects from the rotation angle of the operation ring 16 or the decorative ring 35 whether the interchangeable lens 200 is in the extended state (shooting state) or in the retracted state (non-shooting state). Reference numeral 206 denotes an anti-vibration device drive unit, which includes a drive actuator of the anti-vibration device 8 that performs an anti-vibration operation and a drive circuit thereof.

  Reference numeral 209 denotes an AF driving unit that performs AF driving of the focus barrel 10 through an AF motor (not shown) in accordance with focus lens driving amount information transmitted from the camera CPU 501. Reference numeral 208 denotes an electromagnetic aperture drive unit, which is controlled by the lens CPU 201 that has received an aperture drive command from the camera CPU 501 to operate the aperture unit 34 in an aperture state corresponding to a specified aperture value.

  Reference numeral 211 denotes an angular velocity sensor mounted on the interchangeable lens 200 and connected to the print 31. The angular velocity sensor 211 outputs to the lens CPU 201 angular velocity signals indicating respective angular velocities of vertical (pitch direction) shake and lateral (yaw direction) shake, which are angular shakes of the camera system.

  The lens CPU 201 integrates the pitch velocity and yaw angular velocity signals from the angular velocity sensor 211 electrically or mechanically, and the pitch direction shake amount and the yaw direction shake amount, which are displacement amounts in the respective directions (summarizing them). (Also referred to as angular deflection).

  In close-up shooting at a close distance (shooting conditions with a high shooting magnification), image deterioration due to parallel shake cannot be ignored. In this case, it is preferable to provide an accelerometer for detecting acceleration and to detect parallel shake with this accelerometer.

  The lens CPU 201 controls the anti-vibration device driving unit 206 based on the combined displacement amount of the angular shake amount and the parallel shake amount to shift-drive the anti-vibration lens 2 to perform angular shake correction and parallel shake correction. Further, the lens CPU 201 controls the AF driving unit 209 based on the focus shift amount to drive the focus lens barrel 10 in the optical axis direction to perform focus adjustment.

  Energization of detection signals such as zoom, focus, and anti-vibration operations from the detection means to the lens CPU 201 and control signals from the lens CPU 201 to each actuator is performed by FPC.

  Reference numeral 213 denotes an LED light unit, and reference numeral 212 denotes an LED switch corresponding to a switch 36 described later. When the LED switch 212 is pressed, the signal is sent to the lens CPU 201, and the lighting state of the LED light unit 213 changes each time the LED switch 212 is pressed.

(Configuration of lighting device)
Next, the configuration of the LED light unit (illumination device) will be described with reference to FIG. FIG. 3 is an exploded perspective view of the LED light unit.

  In FIG. 3, 21 is a filter frame, 22 is a diffusion plate (diffusion member), 230 is a light guide (light guide member), 24 is a cover member, 25 is a screw, 26 is a sheet member, 270 is an LED, and 28 is a flexible print. It is a substrate.

  The filter frame 21 is fixed to the main lens barrel 11 with screws, and a filter screw 21a is provided on the inner periphery of the filter frame 21 to be fitted with a second screw portion 40a of a lens hood 40 described later. ing. The nominal diameter of the filter screw 21a is smaller than the diameter of the inner periphery of the diffusion plate 22. The nominal diameter referred to here is the diameter of the threaded portion that is the maximum diameter of the threaded portion in the case of a male screw, and the diameter of the valley of the threaded portion in the case of a female screw.

  The diffusing plate 22 is made of milky white acrylic material in order to diffuse the light from the LED 270 via the light guide 230. Since this is determined in consideration of the light distribution characteristics of LED 270 and the internal appearance, other transparent resins may be used, or the surface may be textured. Note that the diffusion plate 22 is fixed to a flat portion 21b provided on the filter frame 21 with an adhesive or the like.

  The sheet member 26 is made of a soft material such as urethane or rubber, and is fixed by a double-sided tape so as to fill a gap formed between the filter frame 21 and the cover member 24. In the completed state, the sheet 26 is sandwiched and fixed between the surface made of the filter frame 21 and the cover member 24 and the surface made of the first group barrel. This prevents light from leaking inside during LED illumination. Moreover, since the sheet member 26 fills the space between the first group barrel 5 and the filter frame 21, it is possible to suppress the intrusion of dust and water droplets.

(Configuration to achieve uniform illumination during close-up photography)
As shown in FIG. 3, in this embodiment, two LEDs 270 and two light guides 230 are arranged on the left and right, the LEDs 270 are soldered to the flexible printed circuit board 28, and the flexible printed circuit board 28 is connected to the printed circuit board 31. The When the LED 270 is energized through the flexible printed board 28, the LED 270 emits light.

  The light guide 230 is made of a transparent acrylic material, and the surface 230a on the image sensor side is painted white. The light guide 230, the LED 270, and the flexible printed circuit board 28 are fitted from the image sensor side into a recess provided in the filter frame 21 while maintaining the positional relationship as shown in FIG. The cover member 24 is fixed to the filter frame 21 with screws 25 from above. As a result, the light guide 230, the LED 270, and the flexible printed circuit board 28 are sandwiched and fixed between the filter frame 21 and the cover member 24.

  The light from the LED 270 is guided in the circumferential direction by the light guide 230 on the semicircle as shown by the arrow in FIG. At this time, as described above, the surface 230a of the light guide 230 is painted white, and when this white portion is illuminated, it becomes a secondary light source, and light is irradiated to the object side. By doing in this way, since the whole light guide surface 230a becomes a secondary light source, and it irradiates the front surface, it can irradiate more uniformly than the case where the front surface is irradiated from a single light source. That is, the light guide 230 is a light guide member that guides light from the LED 270 as a light source in the circumferential direction and the optical axis direction of the interchangeable lens 200. Irradiation unevenness is likely to occur when close-up shooting is performed near the subject. With such a configuration, it is possible to irradiate the subject uniformly even during close-up shooting.

(Configuration to reduce the size of the lighting device)
The LED unit portion constituted by the diffusion plate 22, the light guide 230, and the LED 270 is formed in a hollow circumferential shape, and a filter screw 21a is formed inside thereof. By doing in this way, an LED unit part can be formed in the outer side of a filter screw. That is, since the optical axis direction position where the filter screw portion is formed and the optical axis direction position where the LED unit is formed can be overlapped and formed at the same position, it contributes to miniaturization in the optical axis direction.

(Shape of the tip of the optical device)
FIG. 4 is a diagram showing a close-up shooting state, in which 36 denotes an LED switch, 41 denotes a subject, and 42 denotes a plane portion on which the subject is placed. As shown in FIG. 4, the imaging apparatus 100 according to the present embodiment has a shortest shooting distance and can shoot close to the subject. In such a situation, there is a possibility that the front end side of the lens (in this embodiment, the filter frame 21) hits the flat surface portion 42, so that it does not get close to the subject or cannot be photographed at a desired angle with respect to the subject. is there.

  On the other hand, in this embodiment, it is not necessary to configure the filter screw on the outermost peripheral portion on the most distal end side of the lens as in the prior art. For this reason, the filter frame 21 which is a lens tip member has a sloped portion with a corner of the outer peripheral portion being reduced, and has a shape that is narrowed toward the tip. Furthermore, by adopting a collapsible structure, an outer peripheral surface 21c that is one step thinner than the outer diameter portion is extended. As a result, all the lenses can be configured inside the line m (on the imaging surface side) as will be described later.

  With such a configuration, as shown in FIG. 4, the subject can be closer to the subject, and the subject can be photographed from a free angle. Further, although it is conceivable that the subject is shadowed by the tip of the lens, the shape of this embodiment reduces the light blockage and makes it easy to capture light.

  In addition, since the diffuser plate 22 that is the tip of the LED unit is disposed on the most object side, there is nothing that obstructs the optical path of the LED illumination, and therefore it is possible to illuminate efficiently. Although an optical filter such as a protective filter can be attached to the filter screw 21a, in this embodiment, the optical filter can be attached without covering the LED. Therefore, even if an optical filter is attached, the illumination of the LED is not affected and a good illumination state can be maintained.

(Sinking state and shooting state)
The interchangeable lens 200 shown in this embodiment is a so-called sag-type interchangeable lens. FIG. 5 is a sectional view of the retracted state of the present embodiment, and FIG. 6 is a view of the retracted state (a) and the photographing state (b) of the present embodiment as viewed from the side. Since each component shown in FIG. 5 is as shown in FIG. 1, detailed description regarding FIG. 5 is omitted.

  In FIG. 6, reference numeral 38 denotes a shooting range at the shortest shooting distance. The distance from the apex on the object side of the lens front lens to the shooting range 38 is a working distance l, and the outer peripheral surface of the filter frame 21 is 21c. . The outer peripheral surface 21c has a cylindrical shape. Thereby, even when the lens group including the filter frame 21 is extended, the gap of the exterior portion is kept substantially constant without changing, and it is possible to prevent intrusion of dust, water droplets and unnecessary light from the gap.

  FIG. 6B shows the intersection of the plane that passes through the apex on the object side of the lens front lens and is perpendicular to the optical axis O and the outer peripheral surface 21c as A, and the intersection of the imaging range 38 and the optical axis O as B. A line connecting B and A is defined as a line m. At this time, in this embodiment, the lens is configured such that all the components of the lens are accommodated inside the line m (on the imaging surface side).

  In the conventional configuration, since a filter screw for attaching a filter lens or the like is configured at the position of the point A, a lens component comes outside the point A (object side). On the other hand, in the present embodiment, the lens can be configured inside the line m by devising such as configuring the filter frame inside the LED portion as described later. Of course, the outer peripheral surface 21c is thinner than the outermost diameter of the lens. By feeding out the outer peripheral surface 21c of the filter frame 21 in a photographing state, the feeding portion can be made thinner. Thereby, the front-end | tip outer peripheral part 19a of the manual focus ring unit 19 can also be stored inside the line m (imaging surface side).

  Moreover, since the outer peripheral surface 21c is the outermost diameter portion, the filter frame 21 is optimal for producing a tapered silhouette without further protrusion when it is extended. Further, when the lens barrel is retracted, the filter frame 21 is housed inside until it cannot be seen from the side surface side. As a result, when retracted, as shown in FIG. 6A, a flat silhouette can be realized on the tip side, which contributes to improvement in design.

(Configuration of lens hood)
The configuration of the lens hood 40 (accessory) will be described with reference to FIG. FIGS. 7A to 7D are views of the lens hood 40 that can be attached to the interchangeable lens 200 as an optical apparatus having an illumination device at the tip as seen from each direction as described above.

  In FIG. 7, 401 is a part of the outer wall portion 40d and is a first connection portion provided on the opening 40g side of the outer wall portion 40d. The first connecting portion 401 includes a female screw 4b (first screw portion) that fits with a male screw provided on a protective filter (not shown), a lens cap, and the like, and a flat screw escape portion (first screw portion) that is not threaded. 1 flat portion) 40h.

  Reference numeral 402 denotes a second connection portion that is provided closer to the opening 40g than the first connection portion 401 and connects to the interchangeable lens 200 described above. The second connecting portion 402 is fitted with the filter screw 21a, which is the above-described female screw, and extends from the inner peripheral surface of the opening 40g in the width direction of the outer wall portion 40d, the male screw 40a (second screw portion), An uncut flat screw escape portion (second flat portion) 40i is provided. Furthermore, the second connection part 402 also includes a fitting part 40e. In addition, the width direction of the outer wall part 40d here shows the direction of the width | variety D1 shown in FIG.7 (d), and is parallel to the normal line of the mask part 40f in a present Example. When the lens hood 40 is attached to the interchangeable lens 200, the optical axis of the interchangeable lens 200 and the width direction of the outer wall portion 40d are parallel.

  Reference numeral 40c denotes a light shielding unit that blocks unnecessary light to the interchangeable lens 200. The light shielding unit 40c can suppress ghosts and flares that are harmful to the photographing result. Note that the opening diameter of the opening 40g may be larger than the lens diameter of the lens on the subject side by the light blocking portion 40c as long as unnecessary light that causes ghost and flare can be cut.

  Reference numeral 40d denotes an outer wall portion which has a cylindrical shape substantially the same diameter as the outer peripheral surface 21c of the filter frame 21 described above, and when the lens hood 40 is attached to the interchangeable lens 200 as shown in FIG. It is comprised so that the side of may be covered. The outer wall portion 40d is in a positional relationship overlapping with the second screw portion 40a at least in the optical axis direction, and is on the outer diameter side of the second screw portion 40a.

  That is, as shown in FIG. 7D, the width D1 of the outer wall portion 40d is wider than the width D2 of the second connection portion 402, and the outer wall portion 40d is configured to cover the second connection portion 402. By adopting such a configuration, the lens hood 40 alone can be stably placed on a desk or the like, and the second connecting portion 402 does not protrude from the outer wall portion 40d, so that the design can be improved. Furthermore, since a plurality of grooves are provided on the surface of the outer wall portion 40d, the user can easily turn the lens hood 40.

  Reference numeral 40e denotes a fitting portion that comes into contact with the interchangeable lens 200 before the second connection portion 402 when the lens hood 40 is attached to the interchangeable lens 200 and has a flat surface. More specifically, the fitting portion 40e is a cylindrical fitting portion that is smaller than the thread diameter of the filter screw 21a at the tip of the interchangeable lens 200. Accordingly, when the lens hood 40 is attached to the interchangeable lens 200, the fitting portion 40e comes into contact with the thread of the filter screw 21a first before the second screw portion 40a is fitted to the filter screw 21a. As a result, the lens hood 40 can be attached to the interchangeable lens 200 in a stable state. Further, when the lens hood 40 is stabilized, the end of the outer wall portion 40d comes into contact with the interchangeable lens 200 and the tip of the interchangeable lens 200 is obtained. Can be prevented from being damaged.

  Reference numeral 40f denotes a mask portion (light source light shielding portion), which is provided between the first contact portion 401 and the second contact portion 402, and is also a flange portion that connects both the connection portions. As shown in FIG. 1 described above, the mask portion 40f is configured to cover the entire light emitting portion of the illumination device when viewed from the optical axis direction when the lens hood 40 is attached to the interchangeable lens 200. Therefore, the mask portion 40f has a width wider than the width L1 of the light emitting portion of the illumination device in a direction orthogonal to the optical axis of the interchangeable lens 200 having a cross section including the optical axis of the interchangeable lens 200. The width of the light emitting part here means the width of the light guide 230 described above as shown in FIG. Alternatively, the width of the diffusing member 22 may be L1. In the case of an illumination device in which a plurality of light emitting points different from the present embodiment are arranged in an annular shape, the width of the plurality of light emitting points may be L1.

More specifically, the diameter of the first screw portion 40a is φ1, the diameter of the second screw portion 40b is φ2, and the width of the light emitting portion of the lighting device is L1. At this time, the lens hood 40 is
φ1> φ2
(Φ1-φ2) / 2> L1
It is configured to satisfy. In this embodiment, the diameter φ1 of the first screw portion 40a and the diameter φ2 of the second screw portion 40b are nominal diameters. The nominal diameter referred to here is the diameter of the threaded portion which is the maximum diameter of the threaded portion in the case of a male screw, and the diameter of the valley of the threaded portion in the case of a female screw. As an example, in this embodiment, L1 = 5 mm, φ1 = 43 mm, and φ2 = 22 mm, so the above conditional expression is satisfied.

  As a result, the mask portion 40f can cover the entire light emitting portion as described above. When the lens hood 40 is attached to the interchangeable lens 200, the entire light emitting portion here is covered and the LED light portion, more specifically, the light guide 230, is not visible when viewed from the direction of the optical axis of the interchangeable lens 200. Means state. That is, in the present embodiment, the light emitting portion of the lighting device means the diffusion member 22 or the ride guide 230 below the diffusion member 22. Unlike the present embodiment, in the case of an illuminating device having a plurality of light emitting points, a plurality of light emitting points may be used as the light emitting unit. Of course, it is not necessary to be completely hidden from view, and light from the entire light emitting unit may be blocked or light incident on the light emitting unit may be blocked from the entire light emitting unit.

(Suppression of image quality degradation by the illumination device provided at the lens tip)
As described above, it is assumed that an illumination device is provided at the front end of the lens for close-up (macro) photography, and an object (such as glass) having a high reflectance is photographed when the reflectance of the surface in the illumination device is high. In this case, even if the illuminating device does not emit light, the LED, the light guide member, and the like are unintentionally reflected in the photograph, which may be an obstacle to photographing. For such a deterioration in image quality, the entire light emitting part can be covered by attaching the lens hood 40 in this embodiment to the lens, so that the LED and the light guide member are unintentionally reflected in the photograph. Can be suppressed. More specifically, image quality deterioration can be suppressed by setting the dimensions to satisfy the above-described conditional expression.

  Further, in addition to the above-described reflection suppression effect, the lens hood 40 has a hood effect such as suppression of ghosts and flares by including a light shielding portion 40c, and the first connection portion 401 has a new filter such as a protective filter and a cap. Accessories can be connected. Thus, since the lens hood 40 is an accessory that also has a plurality of functions, a plurality of functions can be obtained without increasing new parts, and an increase in cost due to the increase in parts can be suppressed. Furthermore, there is no trouble for the user to use a plurality of functional components.

  In addition, as shown in FIG. 7, the subject side surface of the mask unit 40f serving as the light source shielding unit includes a first region and a second region closer to the opening 40g than the first region. This region is lower than the second region. With such a shape, the lens hood 40 can be shortened (thinned) while the screw escape portion 40h is provided.

(Modification)
The outer wall portion 40d is a cylindrical portion in the present embodiment, but is not limited to this, and for example, the side surface may be inclined on a cone. In the present embodiment, the mask portion 40f is a flat disk having a knurled front surface, but may be inclined such as on a cone as long as the entire light emitting portion can be covered. Further, a through hole or the like may be vacated at a place other than the mask portion 40f.

(Other embodiments)
In the above-described embodiment, the configuration including the diffusing member 22, the light guide 230, and the LED 270 as the light source is illustrated as the lighting device, but the configuration of the lighting device is not limited to such a configuration. For example, the configuration may include a ring-shaped xenon tube, a fluorescent tube, a halogen lamp, and an organic EL, or a configuration in which a plurality of mercury lamps, white LEDs, and the like are arranged in an annular shape.

  In the above-described embodiment, the configuration of the optical apparatus including the illumination device at the tip is illustrated. The provision of the illumination device at the tip here means that the light emitting portion, more specifically, the diffusing member 22 is provided on the surface closest to the subject in the interchangeable lens 200 as shown in FIG. However, the present invention is not limited to such a configuration, and a configuration in which the illumination device is located in the vicinity of the surface closest to the subject of the interchangeable lens 200 may be used. For example, a configuration in which an illuminating device is provided in a portion of the interchangeable lens 200 having the smallest diameter may be employed. Furthermore, a configuration in which an illuminating device is provided between the surface on the imaging element side of the lens closest to the subject among the plurality of lenses included in the interchangeable lens 200 and the surface closest to the subject among the interchangeable lenses 200 may be employed.

40 Lens Hood (Accessory)
40f Mask part (light source shading part)
40g opening

Claims (10)

An accessory that can be attached to an optical device having a lighting device at the tip,
An opening for guiding light from a subject to the optical device when the accessory is attached to the optical device;
When the accessory is mounted on the optical device, the cross section including the optical axis of the optical device has a width wider than the width of the light emitting unit of the illumination device, and the illumination is viewed in the optical axis direction of the optical device. A light source shading unit that covers the entire light emitting unit of the device,
Accessories characterized by that. An outer wall portion that covers a side surface of the optical device when the accessory is mounted on the optical device;
The accessory according to claim 1. A first connecting portion which is a part of the outer wall portion and is provided on the opening side of the outer wall portion;
A second connection part provided on the opening part side of the first connection part, for attaching the accessory to the optical device,
The light source shading part is a flange part between the first connection part and the second connection part,
When the accessory is mounted on the optical device, the light emitting part of the illumination device is positioned between the first connection part and the second connection part, and the light emitting part of the illumination apparatus is provided by the flange part. Is configured to be covered entirely,
The accessory according to claim 2. The first connecting portion has a first threaded portion, the second connecting portion has a second threaded portion;
When the diameter of the first screw portion is φ1, the diameter of the second screw portion is φ2, and the width of the light emitting portion of the illumination device in a cross section including the optical axis of the optical device is L1,
φ1> φ2
(Φ1-φ2) / 2> L1
Satisfy,
The accessory according to claim 3. The first screw portion is a female screw;
The second threaded portion is a male thread;
The accessory according to claim 4. The second connection portion has a fitting portion with a flat surface that contacts the optical device before the second screw portion when the accessory is attached to the optical device.
The accessory according to claim 4 or 5, wherein When the accessory is attached to the optical device, the dimension of the outer wall portion in the optical axis direction of the optical device is larger than the dimension of the second connection portion in the optical axis direction,
The accessory according to any one of claims 3 to 6, characterized by that. The accessory according to any one of claims 1 to 7 can be attached,
An optical apparatus comprising the illumination device at a tip. The lighting device includes a light source,
A light guide member for guiding the light source in a circumferential direction and an optical axis direction of the optical device;
A diffusion member provided closer to the tip than the light guide member,
The optical apparatus according to claim 8. The optical apparatus is a lens apparatus including a lens unit configured such that a distance between adjacent lens units changes during zooming or focusing.
The optical apparatus according to claim 8 or 9, wherein:

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