Lighting housing locking member and lighting device using the same in which lighting housing is externally fitted and locked

Abstract

To provide a lighting system in which a lighting housing is externally fitted to a lens barrel capable of compactly arranging the lighting system at the tip part of the lens barrel.SOLUTION: In the lighting device 100, a lighting housing detachably locked by a lighting housing locking member 40 for locking the lighting housing 20 to a tip part 12 of a lens barrel is externally fitted and locked. The illumination housing engaging member 40 has a multi-stage structure in which an annular lens barrel engaging portion 41 that engages with the lens barrel is provided in the upper stage and an illumination housing holding portion 42 that holds the illumination housing is provided in the lower stage, and includes an opening portion 43 that penetrates the lens barrel engaging portion 41 and the illumination housing holding portion 42, and the lens barrel engaging portion 41 is provided with a male screw portion 13b that can be screwed and engaged with a female screw portion 41a formed on the inner peripheral surface of the lens filter engaging portion 13 at the tip of the lens barrel on the outer peripheral surface. The illumination device provided inside the illumination housing 20 is any one of annular illumination, ring illumination, dome illumination, flat illumination, pseudo coaxial illumination, and angular diffusion illumination.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an illumination device in which an illumination housing is fitted over and locked onto the tip of a lens barrel by an illumination housing locking member. [Background technology]

[0002] 2. Description of the Related Art It is common practice to attach a detachable illumination device to the lens barrel of a camera, microscope, or the like and irradiate an inspection object with illumination light to capture an image of the inspection object or observe the inspection object. To attach an illumination device to the outside of a lens barrel, it is common to provide mounting screws on the side of the illumination device, which means that the outer diameter of the illumination device, including the mounting screws, is a constraint when imaging small workpieces using multiple cameras arranged in parallel at a narrow pitch. Furthermore, when inspecting workpieces that use a telecentric optical system, the working distance (WD) between the telecentric optical system objective lens and the workpiece cannot be changed, which places restrictions on the placement of the illumination device when inspecting workpieces with a short working distance (WD).

[0003] Patent Document 1 discloses a detachable lighting device that can be easily attached to lens barrels of various diameters by aligning its axis and eliminating any parts that protrude to the side. The annular lighting device is held by the lens barrel with a holding member that protrudes from and retracts into the inner surface of the battery holder. Patent Document 2 discloses an annular illumination device that is fitted onto the outside of a lens barrel and fixed with mounting screws that protrude in the radial direction. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-287241 [Patent Document 2] Japanese Patent Application Laid-Open No. 2007-287241 Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention provides an illumination device in which an illumination housing is fitted and locked onto the tip of a lens barrel using an illumination housing locking member, thereby enabling the illumination device to be arranged compactly at the tip of the lens barrel and eliminating the constraints of imaging small workpieces using multiple cameras arranged in parallel at a narrow pitch. Another advantage is that the illumination device can be easily disposed perpendicular to the observation axis (optical axis) of the lens. [Means for solving the problem]

[0006] The problem of the present invention can be solved by the following aspects (1) or (2). Specifically,

[0007] (Aspect 1) An illumination device in which an illumination housing is fitted and engaged externally, the illumination housing being detachably engaged by an illumination housing engaging member that engages the illumination housing at the tip of a lens barrel, wherein the illumination housing engaging member has a multi-stage structure with an annular lens barrel engaging portion at the upper stage that engages with the lens barrel and an illumination housing holding portion at the lower stage that holds the illumination housing, and is provided with an opening that penetrates the lens barrel engaging portion and the illumination housing holding portion, and the lens barrel engaging portion has a male thread portion on its outer surface that can be threadedly engaged with a female thread portion formed on the inner surface of the lens filter engaging portion at the tip of the lens barrel.

[0008] (Embodiment 2) A lighting device in which the lighting housing described in embodiment 1 is fitted and locked, characterized in that the lighting device installed inside the lighting housing is any one of annular lighting, ring lighting, dome lighting, flat lighting, pseudo-coaxial lighting, and angular diffuse lighting. [Effects of the Invention]

[0009] According to the present invention, by providing an illumination device in which an illumination housing is fitted and locked onto the tip of a lens barrel by an illumination housing locking member, the illumination device can be arranged compactly at the tip of the lens barrel, eliminating the constraints of imaging small workpieces using multiple cameras arranged in parallel at a narrow pitch. In addition, the illumination device can be easily arranged perpendicular to the observation axis (optical axis) of the lens. [Brief explanation of the drawings]

[0010] [Figure 1] 1A and 1B are explanatory diagrams illustrating the basic configuration of a lighting housing locking member that locks a lighting housing to the tip of a lens barrel according to the present invention. [Figure 2] 1 is an explanatory diagram illustrating a first embodiment of a lighting device in which the lighting housing of the present invention is fitted and locked. [Figure 3] 10 is an explanatory diagram illustrating a second embodiment of a lighting device in which the lighting housing of the present invention is fitted and locked. FIG. [Figure 4] 10 is an explanatory diagram illustrating a third embodiment of a lighting device in which the lighting housing of the present invention is fitted and locked. FIG. [Figure 5] 10 is an explanatory diagram illustrating a fourth embodiment of a lighting device in which the lighting housing of the present invention is fitted and locked. FIG. [Figure 6] FIG. 10 is an explanatory diagram illustrating a fifth embodiment of a lighting device in which the lighting housing of the present invention is fitted and locked. [Figure 7] FIG. 10 is an explanatory diagram illustrating a sixth embodiment of a lighting device in which the lighting housing of the present invention is fitted and locked. [Figure 8] FIG. 10 is an explanatory diagram illustrating a seventh embodiment of a lighting device in which the lighting housing of the present invention is fitted and locked. [Figure 9] FIG. 10 is an explanatory diagram illustrating an eighth embodiment of a lighting device in which the lighting housing of the present invention is fitted and locked. DETAILED DESCRIPTION OF THE INVENTION

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the accompanying drawings. However, the drawings are merely examples of embodiments, and the present invention is not limited thereto.

[0012] 1. Configuration of lighting device with lighting housing fitted and locked The lighting device of the present invention, in which the lighting housing is fitted and locked from the outside, is configured so that the lighting housing is detachably fitted to the tip of a lens barrel that is detachable from a camera body (not shown) using a lighting housing locking member. Hereinafter, embodiments of the lighting housing locking member of the present invention and a lighting device in which the lighting housing is fitted and locked will be described.

[0013] 2. Lighting housing locking member 1A and 1B are explanatory diagrams illustrating the basic configuration of an illumination housing locking member that locks an illumination housing to the tip of a lens barrel of the present invention, where (a) and (f) are plan views, (b) and (d) are side views, (c) and (e) are side end views, and (g) and (h) are perspective views. The lighting housing locking member 40 of the present invention has a multi-stage structure with an annular lens barrel engagement portion 41 at the top that engages with the lens barrel 10 and an illumination housing holding portion 42 at the bottom that holds the lighting housing 20. It also has a circular opening 43 that penetrates the lens barrel engagement portion 41 and the lighting housing holding portion 42. The outer peripheral surface of the annular lens barrel engagement portion 41 is provided with a male thread portion 41a that can be threadedly engaged with a female thread portion 13b formed on the inner peripheral surface of the lens filter locking portion 13 at the tip 12 of the lens barrel 10. It is also possible to provide the male thread portion 42a on the outer peripheral surface of the lighting housing holding portion 42 (see FIG. 1(c)), or to provide the female thread portion 43b on the inner peripheral surface of the opening 43 (see FIG. 1(e)). The shape of the opening 43 can be made into a shape other than a circle, such as a square, polygon, or ellipse, by fitting an opening frame 44 having a different opening shape into the opening 43 .

[0014] 3. Aspects of the lighting device in which the lighting housing is fitted and locked (3-1) First aspect 2A and 2B are explanatory diagrams illustrating a first embodiment of a lighting device 100 in which the lighting housing of the present invention is fitted and locked. (a) is a side view, (b) is a side end view, and (c) is an end view illustrating an embodiment in which the lighting housing is locked to the lens barrel by a lighting housing locking member. Note that in the end view of the lens barrel 10 of the present invention, only the base end 11 and the tip end 12 of the lens barrel 10 are shown, and the central optical system (lens group) is not shown. Also, (e) to (h) are explanatory diagrams of the lighting housing locking member 40 used in the first embodiment, where (e) is a plan view, (f) a side view, (g) a side end view, and (h) a perspective view, respectively. In lighting device 100 in which a lighting housing according to the first aspect of the present invention is fitted and locked, lighting housing 20 is fitted onto lens barrel 10 by lighting housing locking member 40. Lighting housing locking member 40 is locked by threading male thread 41a provided on the outer peripheral surface of annular lens barrel engagement portion 41 that engages with lens barrel 10 and female thread 13b provided on the inner peripheral surface of lens filter engagement portion 13 at the tip of the lens barrel. Furthermore, female thread 20b provided on the inner peripheral surface of the tip of lighting housing 20 and male thread 42a provided on the outer peripheral surface of lighting housing holding portion 42 are threadedly engaged to hold lighting housing 20. The lighting casing 20 is equipped with a ring-shaped light source having light sources 22 arranged in a ring shape, and electricity is supplied to the light source 20 through a cable 21. The light source 22 may be any known light source such as an LED light source, and is not particularly limited.

[0015] (3-2) Second aspect 3A and 3B are explanatory diagrams illustrating a second embodiment of the lighting device 100 in which the lighting housing of the present invention is fitted and locked. (a) is a side view, (b) is a side end view, and (c) is an end view illustrating an embodiment in which the lighting housing is locked to the lens barrel by the lighting housing locking member. Note that in the end view of the lens barrel 10 of the present invention, only the base end 11 and the tip end 12 of the lens barrel 10 are shown, and the central optical system (lens group) is not shown. Also, (d) to (e) are explanatory views of the lighting housing locking member 40 used in the second embodiment, with (d) being a side view and (e) being a side end view, respectively. The lighting device 100 in which the lighting housing of the second embodiment of the present invention is fitted and locked is the first embodiment with a filter 23 attached. The filter 23 is locked by threading the female thread 43b provided on the inner circumferential surface of the lighting housing locking member 40 into the male thread 23a of the filter 23.

[0016] (3-3) Third aspect 4A and 4B are explanatory diagrams illustrating a third embodiment of the lighting device 100 in which the lighting housing of the present invention is fitted and locked. (a) is a side view, (b) is a side end view, and (c) is an end view illustrating an embodiment in which the lighting housing is locked to the lens barrel by the lighting housing locking member. Note that in the end view of the lens barrel 10 of the present invention, only the base end 11 and the tip end 12 of the lens barrel 10 are shown, and the central optical system (lens group) is not shown. Also, (d) to (e) are explanatory views of the lighting housing locking member 40 used in the third embodiment, where (d) is a plan view and (e) is a side end view. Illumination device 100 in which an illumination housing of a third aspect of the present invention is fitted and locked is an aspect in which illumination housing 20, which houses a ring illumination, is locked to the tip of lens barrel 10 by illumination housing locking member 40. Illumination housing locking member 40 of the third aspect is provided with a plurality of through holes 45 for locking illumination housing 20, which houses a ring illumination having a plurality of light sources 22 arranged concentrically in illumination housing holding portion 42, with locking member 46. Illumination housing locking member 40 is locked by threading male thread portion 41a provided on the outer peripheral surface of an annular lens barrel engaging portion 41 that engages with lens barrel 10, into female thread portion 13b provided on the inner peripheral surface of lens filter engaging portion 13 at the tip of the lens barrel.

[0017] (3-4) Fourth aspect 5A and 5B are explanatory diagrams illustrating a fourth embodiment of the lighting device 100 of the present invention in which the lighting housing is fitted and locked. (a) is a side view, (b) is a side end view, and (c) is an end view illustrating an embodiment in which the lighting housing is locked to the lens barrel by the lighting housing locking member. Note that in the end view of the lens barrel 10 of the present invention, only the base end 11 and the tip end 12 of the lens barrel 10 are shown, and the central optical system (lens group) is not shown. 10(d) is a side view illustrating the lighting housing locking member 40 used in the fourth embodiment. In lighting device 100 in which lighting housing according to the fourth aspect of the present invention is fitted and locked, lighting housing locking member 40 is disposed in a manner that it is contained within lens barrel 10 and lighting housing 20. Lighting housing locking member 40 is locked by threading male thread portion 41a provided on the outer peripheral surface of annular lens barrel engagement portion 41 that engages with lens barrel 10 and female thread portion 13b provided on the inner peripheral surface of lens filter engagement portion 13 at the tip of the lens barrel.

[0018] (3-5) Fifth aspect 6A and 6B are explanatory diagrams illustrating a fifth embodiment of the lighting device 100 in which the lighting housing of the present invention is fitted and locked. (a) is a perspective view, (b) a side view, (c) a side end view, and (d) an end view illustrating an embodiment in which the lighting housing is locked to the lens barrel by the lighting housing locking member. Note that the end view of the lens barrel 10 of the present invention shows only the base end 11 and the tip end 12 of the lens barrel 10, and does not show the central optical system (lens group). Also, (d) to (e) are explanatory views of the lighting housing locking member 40 used in the fifth embodiment, with (d) being a side view and (e) being a side end view, respectively. The lighting device 100 fitted with the lighting housing of the fifth aspect of the present invention is a dome lighting device 24 with a dome-shaped housing. Dome lighting reflects light onto the dome top plate, irradiating the light evenly, making it less likely to cast shadows on the uneven surface of the workpiece. Therefore, by eliminating shadows caused by the unevenness of the workpiece, it is possible to clearly show stains, color changes due to markers, etc. To lock the dome light 24 to the tip of the lens barrel 10, first, the male thread portion 41a on the outer surface of the lens barrel engagement portion 41 is screwed into the female thread portion 13b on the inner surface of the lens filter engagement portion 13 at the tip of the lens barrel to lock the lighting housing locking member 40 to the tip of the lens barrel 10, and then the dome light 24 is locked by screwing the female thread portion 43b on the inner surface of the lighting housing locking member 40 into the male thread portion 50a of the dome light fixing member 50.

[0019] (3-6) Sixth Aspect 7A and 7B are explanatory diagrams illustrating a sixth embodiment of the lighting device 100 in which the lighting housing of the present invention is fitted and locked. (a) is a perspective view, (b) a side view, (c) a rear view, and (d) an end view illustrating an embodiment in which the lighting housing is locked to the lens barrel by the lighting housing locking member. Note that the end view of the lens barrel 10 of the present invention shows only the base end 11 and the tip end 12 of the lens barrel 10, and does not show the central optical system (lens group). Also, (e) to (f) are explanatory views of a flat illumination locking member 60 used in the sixth embodiment, with (d) being a side view and (e) being a side end view, respectively. The sixth embodiment of the present invention, in which an illumination device 100 is fitted and locked with an illumination housing, is an embodiment in which an illumination housing 20 having a flat illumination device 27 installed therein is locked to the tip of a lens barrel 10 by an illumination housing locking member 40. The flat illumination device is characterized by being able to emit diffused light from a flat light-emitting surface using a diffusion plate 28 and a planar illumination device 27 consisting of light sources arranged in a plane. The lighting housing 20 of the sixth aspect has a structure in which the flat lighting 27 and the diffuser 28 are enclosed in a flat lighting fixing member 60 and a diffuser plate fixing frame 61. The flat lighting fixing member 60 has an annular lens barrel engaging portion 62 with a male thread portion 62a on its outer circumferential surface for engaging with the lens barrel 10. After the lighting housing locking member 40 is locked to the lens barrel 10, the flat lighting fixing member 60 and the lighting housing locking member 40 are locked to the lens barrel 10 by the rotating fixing ring 26.

[0020] (3-7) Seventh aspect 8A and 8B are explanatory diagrams illustrating a seventh embodiment of the lighting device 100 in which the lighting housing of the present invention is fitted and locked. (a) is a perspective view, (b) a side view, (c) a side end view, and (d) an end view illustrating an embodiment in which the lighting housing is locked to the lens barrel by the lighting housing locking member. Note that in the end view of the lens barrel 10 of the present invention, only the base end 11 and the tip end 12 of the lens barrel 10 are shown, and the central optical system (lens group) is not shown. Also, (e) to (f) are explanatory views of the pseudo-coaxial illumination fixing member 70 used in the seventh embodiment, with (d) being a side view and (e) being a side end view, respectively. The illumination device 100, fitted with the illumination housing of the seventh aspect of the present invention, is a pseudo-coaxial illumination device having an illumination optical axis that is coaxial with the optical axis of the imaging means installed inside the illumination housing 20, including the light source 22 and half mirror 29. Pseudo-coaxial illumination has a property in which the chief ray is parallel to the optical axis in the object space, resulting in very high directivity. Therefore, by adopting it in a telecentric optical system, shadows caused by unevenness on the object to be inspected become clear, making it possible to clearly capture the contours. The lighting housing 20, which houses the light source 22 and half mirror 29 according to the seventh aspect of the present invention, is locked to the pseudo-coaxial lighting fixing member 70 by a through-hole 74 provided in the pseudo-coaxial lighting fixing member 70 and a locking member (not shown). The pseudo-coaxial lighting fixing member 70 has an annular lens barrel engaging portion 71 with a male thread portion 71a on its outer circumferential surface for engaging with the lens barrel 10. After the lighting housing locking member 40 is locked to the lens barrel 10, the pseudo-coaxial lighting fixing member 70 and the lighting housing locking member 40 are locked to the lens barrel 10 by the rotating fixing ring 26.

[0021] (3-5) Eighth aspect 9A and 9B are explanatory diagrams illustrating an eighth embodiment of lighting device 100 in which the lighting housing of the present invention is fitted and locked. (a) is a side view, (b) is a plan view, and (d) is an end view illustrating an embodiment in which the lighting housing is locked to the lens barrel by the lighting housing locking member. Note that in the end view of lens barrel 10 of the present invention, only base end 11 and tip end 12 of lens barrel 10 are shown, and the central optical system (lens group) is not shown. Also, (e) to (g) are explanatory views of the lighting housing locking member 40 used in the eighth embodiment, where (e) is a plan view, (f) is a side end view, and (g) is a rear view, respectively. Also, (c) is a perspective view of the square diffused lighting. The lighting device 100 with the lighting housing fitted and locked according to the eighth aspect of the present invention is an aspect in which the lighting housing 20 housing the square-shaped diffuse lighting device 25 is locked to the tip of the lens barrel 10 by the lighting housing locking member 40. The square-shaped diffuse lighting device has the characteristic of being able to irradiate the object to be inspected with high-intensity diffused illumination light. In the eighth aspect of lighting housing locking member 40, lighting housing holding portion 42 has through-hole 47 for holding square diffuse luminaire 25, and locking member 46 holds square diffuse luminaire 25. Lighting housing locking member 40 is locked by threading male thread portion 41a provided on the outer peripheral surface of annular lens barrel engaging portion 41 that engages with lens barrel 10, and female thread portion 13b provided on the inner peripheral surface of lens filter engaging portion 13 at the tip of the lens barrel. [Industrial Applicability]

[0022] The present invention can provide an illumination device in which an illumination housing is fitted and locked onto the tip of a lens barrel. [Explanation of symbols]

[0023] 100 Lighting device with lighting housing fitted and locked 10 lens barrel, 11 base end of lens barrel, 12 tip end of lens barrel, 13 lens filter engaging portion, 13b female thread portion (inner peripheral surface of lens filter engaging portion) 20 Lighting housing, 21 Cable, 22 Light source, 23 Filter, 24 Dome lighting, 25 Square diffused lighting, 26 Rotating fixing ring, 27 Flat lighting, 28 Diffuser, 29 Half mirror 40: Lighting housing locking member, 41: Lighting housing locking engagement portion, 41a: Male thread portion (lighting housing locking engagement portion), 42: Lighting housing holding portion, 42a: Male thread portion (lighting housing holding portion), 43: Opening, 44: Opening frame, 45: Through hole, 46: Locking member 50 Dome lighting fixing member, 50a Male thread portion (dome lighting fixing member) 60: Flat lighting fixing member; 61: Diffuser plate fixing frame; 62: Lens barrel engaging portion; 62a: Male thread portion (lens barrel engaging portion) 70 pseudo-coaxial lighting fixing member, 71 lens barrel engaging portion, 74 through hole

Claims

1. An illumination device in which an illumination housing is fitted and engaged with a tip end of a lens barrel by an illumination housing engaging member that engages the illumination housing in a detachable manner, the lighting housing locking member has a multi-stage structure including an annular lens barrel engaging portion at an upper stage that engages with the lens barrel and a lighting housing holding portion at a lower stage that holds the lighting housing, and includes an opening that penetrates the lens barrel engaging portion and the lighting housing holding portion; the lens barrel engaging portion has an outer peripheral surface provided with a male screw portion that can be threadedly engaged with a female screw portion formed on an inner peripheral surface of the lens filter engaging portion at the tip of the lens barrel; A lighting device in which a lighting housing is fitted and locked.

2. 2. A lighting device fitted and secured to the exterior of a lighting housing as described in claim 1, wherein the lighting device installed inside the lighting housing is any one of annular lighting, ring lighting, dome lighting, flat lighting, pseudo-coaxial lighting, and angular diffused lighting.

Images