Magnifying glass

Abstract

To provide a magnifying glass that is small-size and light-weight and excellent in operability, and allows clear and efficient observation of a deep part of a small-diameter hole while illuminating the deep part.SOLUTION: A magnifying glass 1 has: a lens barrel 10 on an optical axis 11; an objective lens 2 as a lens 2 arranged on the optical axis 11 at an objective end 12 inside the lens barrel 10; an eyepiece part 3 having an opening 32 on the optical axis 11 at an eyepiece end 13 inside the lens barrel 10; and an illumination unit 4 between the objective end 12 and the eyepiece end 13 inside the lens barrel 10. The illumination unit 4 has a light shielding barrel part 51 arranged around the opening 32 inside the lens barrel 10, and LEDs 40 as a plurality of (four or three) illumination elements 40 arranged within the diameter of the objective lens 2 inside the lens barrel 10, at an equal angle α (90° or 120°) around the light shielding barrel 51. The LEDs 40 are inclined and fixed at an angle of β (0-45°) with respect to the optical axis 11.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to an optical instrument for magnifying and observing an object, and more particularly to a magnifying glass that illuminates the inside of a small diameter hole to enable observation. [Background technology]

[0002] Conventionally, when inspecting the inner wall and bottom surfaces of small holes in casting products, especially the step-shaped bottom surfaces, for defects such as voids (cast cavities, etc.), burrs, or scratches, the deep parts are dark and cannot be clearly seen with a conventional magnifying glass such as a loupe. It is particularly difficult to accurately inspect the above defects in holes with a diameter of 10 mm or less and a depth of 15 mm or more. When illuminating the inside of a small hole and attempting to observe with a magnifying glass, the lens barrel of the magnifying glass itself blocks the illumination, so the light does not reach the deep parts of the small hole, making it impossible to observe.

[0003] As a technique related to such circumstances, there is a surface observation device in Patent Document 1 (JP Patent Publication 2001-296114 A). This surface observation device includes a transparent pipe and a CCD camera connected to the transparent pipe via a lens system, the outer peripheral surface of the tip of the transparent pipe is formed with a tapered surface that decreases in diameter toward the tip, the inner peripheral surface of the tip of the transparent pipe is formed with a reverse tapered surface that increases in diameter toward the tip, the outer peripheral surface of the base end of the transparent pipe is formed with a reverse tapered surface that increases in diameter toward the tip, and a light source for illumination is provided on the reverse tapered surface of the outer peripheral surface of the base end of the transparent pipe, and the inside of a hole or the surface of a rod-shaped object is observed.

[0004] Furthermore, Patent Document 2 (JP Patent Publication No. 2013-164406) discloses an inspection method and an inspection device that include an imaging position setting step of setting the positions of a surface light source and a lens relative to the injection nozzle so that an image plane on which the surface light source is imaged is located near the bottom of the deep hole, and an irradiation solid angle inclination adjustment step of setting the position of the first aperture relative to the lens so that the central axis of an irradiation solid angle defined by the inspection light incident on the outer edge of the image plane is parallel to the optical axis or is deviated from the optical axis and inclined by a predetermined amount. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2001-296114 A [Patent Document 2] JP 2013-164406 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, although the surface observation device shown in Patent Document 1 is suitable for observing holes with a diameter and depth that allow the insertion of a transparent pipe, in the case of a small-diameter hole, the transparent pipe must also be made smaller in diameter. A thin transparent pipe is easily damaged or broken by contact with the wall surrounding the hole. This requires more careful operation, which may reduce the efficiency of the observation work.

[0007] In the inspection method and inspection device of Patent Document 2, light from a light source is reflected by a half mirror arranged on the optical axis of an imaging device and irradiated onto an object to be observed. This makes the inspection device large and expensive, and also reduces the operability and efficiency of the inspection work.

[0008] SUMMARY OF THE PRESENT EMBODIMENT In view of the above circumstances, the present invention provides a magnifying glass which is small, lightweight, and easy to operate, and which allows clear and efficient observation while illuminating the deep portion of a small diameter hole. [Means for solving the problem]

[0009] The present invention relates to a magnifying glass comprising a lens barrel having an optical axis therein, a lens arranged on the optical axis at the objective end of the lens barrel, an eyepiece section at the eyepiece end of the lens barrel having an opening (which may be an "aperture") with the optical axis therein, and an illumination unit arranged between the objective end and the eyepiece end of the lens barrel, wherein the illumination unit has a light-shielding tube arranged around the opening in the lens barrel, and an illumination element arranged between the light-shielding tube and the lens barrel and irradiates light toward the objective-holding side, and wherein the distance between the center of the optical axis and the center of the illumination element is 25 mm or less.

[0010] The lens barrel contains each component part of the magnifying glass of the present invention and is integrated into one body. The lens barrel can be a cylinder on the optical axis of the built-in optical system. The lens barrel has the objective end and the eyepiece end, and a lens can be attached to the inside of the objective end and / or the eyepiece end. The lens barrel can have the eyepiece part attached to the inside of the eyepiece end. The lens barrel can have an illumination unit built in between the objective end and the eyepiece end on its inner side.

[0011] The lens refracts light passing through the lens barrel and first creates a magnified image of the object to be observed. The lens may be an objective lens consisting of one or a group of lenses. The lens has an eyepoint on an optical axis extending outside the eyepiece end of the lens barrel. The lens may have a refractive index set to be higher in the portions facing the eyepiece and each of the plurality of illumination elements than in the remaining portions. The lens may have a small lens portion facing the eyepiece and a plurality of illumination lens portions facing each of the plurality of illumination elements. The plurality of illumination lens portions may be inclined such that their optical axes intersect with the optical axis of the lens barrel outside the objective end. The inclination angle of each optical axis of the plurality of illumination lens portions may be 0 to 45°, preferably 5 to 30°, with respect to the optical axis of the lens barrel. The inclination angle of less than 0° and more than 45° has a low effect of focusing light on the deep part of the small diameter hole of the object to be observed.

[0012] The eyepiece protects the magnified image passing through the eyepiece end of the lens barrel from intrusion of external light and also serves as an aperture. The eyepiece has the opening that makes the pupil diameter of the lens 70 to 80%. When the opening of the eyepiece makes the pupil diameter of the lens 70 to 80%, it is possible to suppress aberration and obtain an image more suitable for observation. The plurality of illumination elements may be arranged in the remaining 30 to 20% of the pupil diameter of the lens outside the opening. The eyepiece has an optical path tube that extends from the eyepiece end of the lens barrel to the objective end and serves as the opening. The inner diameter of the opening may be 15 mm or less, preferably 10 mm or less, and more preferably 7 mm or less. The optical path tube has an inner peripheral wall that is painted in matte black or is an anti-reflection wall formed by flocking or the like, thereby preventing diffuse reflection.

[0013] The illumination unit illuminates an object to be observed, particularly an inner wall surface or bottom surface of a small diameter hole of an object to be observed, particularly a bottom surface formed in a stepped shape. The illumination unit can be configured with a light-shielding tube arranged on the optical axis in the lens barrel (particularly around the opening), and an illumination element arranged between the light-shielding tube and the lens barrel to irradiate light toward the objective end. The illumination element can be an incandescent light bulb, an LED (Light Emission Diode), an LD (Laser Diode), or the like. The illumination element can be replaced with a plurality of optical fibers guided from one or a plurality of illumination elements and the emission ends of the light. The illumination element can be an illumination element array in which four or more illumination elements are mounted in a ring shape on a ring-shaped substrate.

[0014] The light-shielding tube prevents illumination light emitted by the multiple lighting elements from entering the opening (light path tube portion) of the eyepiece. The tip edge of the light-shielding tube is in close contact with the lens. The light-shielding tube can be a separate part from the lighting unit, and the opening can also serve as the light-shielding tube. The light-shielding tube can be integrated with at least one of the eyepiece, the telescope tube, and the lens. The light-shielding tube fixes the multiple lighting elements around the optical axis inside the telescope tube (the outer periphery of the opening of the pupil diameter). The light-shielding tube can be integrated with a lamp holder that is arranged around the light-shielding tube inside the telescope tube and supports the multiple lighting elements. The light-shielding tube can be integrated with the light path tube portion.

[0015] In the magnifying glass of the present invention, it is desirable that the opening has an inner diameter of 15 mm or less, and more desirably 10 mm or less.

[0016] When the opening has an inner diameter of 15 mm or less, preferably 10 mm or less, the inner wall surface and bottom surface of an observation hole having a diameter of 10 mm or less and a depth of 10 mm or less, particularly the bottom surface formed in a stepped shape, can be observed more clearly. The inner diameter of the optical path tube portion becomes the opening of the lens. When the optical path tube portion has an inner diameter of 15 mm or less, preferably 10 mm or less, the inner wall surface and bottom surface of an observation hole having a diameter of 10 mm or less and a depth of 10 mm or less, particularly the bottom surface formed in a stepped shape, can be observed more clearly. The eyepiece portion has an eyecup made of soft resin.

[0017] In particular, by making the distance between the center of the optical axis and the center of the lighting element 25 mm or less, preferably 15 mm or less, and particularly preferably 10 mm or less, the center of the optical axis and the lighting element can be brought close to each other, and the irradiated light can pass through to the bottom of the small diameter hole without being scattered. It is also preferable that the lighting elements are disposed within the aperture of the lens in the lens barrel at equal angles around the light shielding tube, and that the light irradiated from the lighting elements is transmitted and refracted through the lens to illuminate an extension of the optical axis. This is because the light irradiated from the lighting elements is refracted so that its path is directed inward by transmitting through the lens, and can intersect on an extension of the optical axis.

[0018] In the magnifying glass of the present invention, it is preferable that the lighting elements of the lighting unit are inclined at an angle of 0 to 45° toward the optical axis, and that the illumination lights of each intersect on an extension of the optical axis of the lens. The lighting elements are inclined at an acute angle of 0 to 45°, preferably 5 to 30°, toward the optical axis, and can illuminate the object of observation, the deep part of a small diameter hole. The inclination angle of less than 0° and more than 45° has a low illumination effect on the deep part of the small diameter hole of the object of observation.

[0019] The present invention relates to a magnifying glass in which the lighting unit uses LED elements as the lighting elements and has a power supply circuit for the lighting elements, the power supply circuit including a power supply section that supplies power to each lighting element and a switch that controls at least turning the lighting elements on and off.

[0020] The power supply circuit includes a power supply unit that supplies power to the lighting elements, and a switch that at least turns the lighting elements on and off. The power supply circuit can be disposed within the optical path tube portion (opening) of the eyepiece, or in a position that does not interfere with the illumination of the multiple lighting elements. The power supply circuit can be disposed on the eyepiece end side of the multiple lighting elements of the lens barrel, with the switch exposed to the outside of the lens barrel. The power supply circuit has at least one of a blinking circuit that blinks, a dimming circuit that adjusts the light, or a color adjusting circuit that adjusts the color in response to operation of the switch.

[0021] The power supply unit supplies power to the lighting elements in response to the operation of the switch. The power supply unit can be either a primary battery or a secondary battery. The power supply circuit has a charging cable socket exposed on the lens barrel. The power supply circuit incorporates a secondary coil for wireless charging in the lens barrel. The secondary coil for wireless charging can be incorporated along the ring shape of at least one of the objective end or eyepiece end of the lens barrel. The switch can be a seesaw type, button type, rotary type, or the like, or can be a capacitive touch switch. The switch can be a volume switch that can be operated steplessly, such as a rotary type with ON / OFF or a slide type, and can enable dimming and color adjustment.

[0022] The present invention relates to a magnifying glass having a focus adjustment mechanism that is provided on the optical axis of the eyepiece portion, an optical path tube portion that is loosely inserted from the eyepiece end of the light-shielding tube so as to be able to move forward and backward freely, an eyepiece optical system that is arranged at the eyepiece end within the optical path tube portion, and a mechanism for moving forward and backward in the optical axis direction that is arranged between the lens tube and the eyepiece portion.

[0023] The focus adjustment mechanism adjusts the distance on the optical axis between the lens and the eyepiece optical system to enable focusing. The eyepiece optical system further enlarges the image enlarged by the lens. The advance / retract mechanism enables the eyepiece optical system to be advanced and retracted in the optical axis direction relative to the lens. The advance / retract mechanism may be provided on an outer peripheral wall of the lens barrel near the eyepiece end and on an inner peripheral wall of a focus ring disposed at the eyepiece end of the lens barrel and integrated with the eyepiece portion. The advance / retract mechanism may be a helicoid mechanism or a telescopic mechanism. The focus adjustment mechanism may be an inner focus type having the advance / retract mechanism built in. Effect of the Invention

[0024] According to the magnifying glass of the present invention, the magnifying glass itself illuminates without blocking the illuminating light, and thus it is possible to obtain the excellent effect of being able to easily and clearly observe the deep portion of the small diameter hole. [Brief description of the drawings]

[0025] [Figure 1] 1A is a cross-sectional view of a magnifying glass 1 according to a first embodiment, and FIG. [Diagram 2] 1A is a plan view of a magnifying glass 1 according to a first embodiment, and FIG. [Diagram 3] 3 is a schematic cross-sectional view of a small diameter hole 60 according to the first embodiment; FIG. [Figure 4] 13A is a cross-sectional view taken along line AA in FIG. 13B, showing a modified example of the magnifying glass 1 according to the second embodiment; [Diagram 5] (A) A cross-sectional view of a magnifying glass 1 according to a third embodiment, showing the arrangement and shape of a small lens portion 20 and an illumination lens portion 21. (B) A cross-sectional view of a magnifying glass 1 having a lens hood portion 22 around the outer periphery of the small lens portion 20 and an imaging lens 34 in an optical path tube portion 30. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] Hereinafter, a magnifying glass according to the present embodiment will be specifically described with reference to the drawings. In particular, the present embodiment is a magnifying glass having three or more lighting elements.

[0027] As shown in Figs. 1 to 3, the magnifying glass 1 has a lens barrel 10 on an optical axis 11. An objective lens 2 (narrow angle lens) is provided on the optical axis 11 at an objective end 12 in the lens barrel 10. An eyepiece section 3 having an opening 32 provided on the optical axis 11 is provided at an eyepiece end 13 in the lens barrel 10. An illumination unit 4 is provided between the objective end 12 and the eyepiece end 13 in the lens barrel 10. The illumination unit 4 has a light-shielding tube section 51 provided around the opening 32 in the lens barrel 10, and a plurality (four) of LEDs 40 as illumination elements 40 provided around the light-shielding tube section 51 at equal angular intervals within the aperture of the objective lens 2 in the lens barrel 10.

[0028] The illumination unit 4 incorporates a lamp holder 5 having an outer diameter slightly smaller than the inner diameter of the lens barrel 10 between the objective end 12 and the eyepiece end (focus ring) 13 in the lens barrel 10. The lamp holder 5 has an optical path hole 50 drilled on the optical axis 11 passing through the lens barrel 10. The optical path hole 50 is partitioned and formed by the inner wall surface of the light-shielding tube portion 51. The optical path hole 50 has an inner diameter slightly larger than the outer diameter of the optical path tube portion 30 described later. The lamp holder 5 has lamp holes 52 at four locations between its outer diameter and the light-shielding tube portion 51, spaced at equal angles α of 90° around the optical axis 11. The axis of each lamp hole 52 is inclined so as to intersect with the optical axis 11 extended to the outside of the objective end 12 of the lens barrel 10 at an angle β of 0 to 45°, preferably 5 to 30°. An LED 40 with its light-emitting portion facing the objective end 12 is concentrically mounted in each lamp hole 52, and each LED 40 is fixed at an angle β of 0 to 45°, preferably 5 to 30°, with respect to the optical axis 11.

[0029] The outer periphery of the objective lens 2 is fixed to the inner periphery wall of the objective end 12 of the lens barrel 10. The annular front edge of the light-shielding tube part 51 of the lamp holder 5 is in close contact with the objective lens 2. The eyepiece part 3 has an eyepiece base end 30 with a diameter slightly smaller than the inner diameter of the lens barrel 10, and the light path tube part 31 that extends from the eyepiece base end 30 on the optical axis 11 toward the objective lens 2 side to approximately 1 / 2 of the total length of the lens barrel 10. The openings 32 are drilled on the optical axis 11 of the eyepiece base end 30 and the light path tube part 31. The outer periphery of the eyepiece base end 30 is fixed to the inner periphery wall of the lens barrel 10, and the light path tube part 31 is disposed in the light path hole 50.

[0030] The inner diameter of the opening 32 of the optical path tube portion 31 is set to 6 mm. As shown in Figs. 1 to 3, by using the magnifying glass 1, illumination can be reliably delivered to the depth of the observation target hole 60 (inner diameter 6 mm, depth 22 mm) of the observation target 6 (cast iron product) without being obstructed by the lens barrel 10, and a clearer observation can be achieved. The magnifying glass 1 uses the LEDs 40 at four locations around the optical path tube portion 31 (opening 32) to uniformly illuminate the depth of the observation target hole 60. The LEDs 40 are inclined to intersect with the optical axis 11 at an angle β of 0 to 45°, preferably 5 to 30°, and are transmitted through the objective lens 2 and condensed, thereby illuminating the entire inside of the observation target hole 60 without shadows or unevenness. Since the light-shielding tube portion 51 reaches the objective lens 2, the light of the LED 40 is prevented from entering the light path hole 50 and the light path tube portion 31 (opening 32), making the image at the eyepoint 7 clearer.

[0031] The light reflected on the inner wall surface and bottom surface of the observation hole 60, particularly on the stepped bottom surface, reaches the eyepoint 7 through the objective lens 2, the light path hole 50, and the light path tube portion 31. By using the magnifying glass 1, defects 61 such as burrs, roughness, blowholes, chips, cracks, breaks, and shrinkage on the inner peripheral wall and the stepped bottom surface as well as the bottom wall of the observation hole 60 can be more clearly confirmed.

[0032] As shown in FIG. 4(A), in the magnifying glass 1 of this embodiment, the eyepiece unit 3 has an eyepiece lens 33 as an eyepiece optical system 33 in the opening 32. The outer peripheral edge of the eyepiece base 30 of the eyepiece unit 3 is fixed to a focus ring 13 that is separate from the lens barrel 10. The focus ring 13 has an advance / retract mechanism 300 in the direction of the optical axis 11 between its inner peripheral wall on the objective end 12 side and the outer peripheral wall on the eyepiece end 13 side of the lens barrel 10. The advance / retract mechanism 300 can be a single- or multiple-strand helicoid mechanism 300 that rotates the focus ring 13 around the optical axis 11 to advance / retract it relative to the lens barrel 10, or a telescopic mechanism 300 that advances / retracts the focus ring 13 in the direction of the optical axis 11 relative to the lens barrel 10. The advance / retract mechanism 300 can be operated to adjust the focus.

[0033] The magnifying glass 1 of this embodiment has a power supply circuit 41 connected to the LED 40 between the illumination unit 4 and the lens barrel 10. A battery 42 serving as a power supply unit disposed on the eyepiece end 13 side of the LED 40 in the light hole 52, and a switch 43 exposed on the outer circumferential wall of the lens barrel 10 are connected to the power supply circuit 41. The LED 40 can be turned on and off by operating the switch 43.

[0034] Each time the switch 43 is operated, the LED 40 can be switched between on, blinking, and off. The power supply circuit 41 has at least one of a color adjustment circuit and a light adjustment circuit, and the brightness can be adjusted or the color can be changed each time the switch 43 is operated. By changing the brightness or color, defects, irregularities, etc. can be more clearly identified depending on the size, shape, and color of the inspection object.

[0035] As shown in FIG. 4(B), in the magnifying glass 1 of the second embodiment, the lighting unit 4 has a total of three lamp holes 52 arranged at an angle α of 120° around the optical axis 11, and a total of three LEDs 40 can be evenly arranged around the light-shielding tube portion 51.

[0036] The power supply circuit 41 can select the number and lighting positions of the LEDs 40 each time the switch 43 is operated. The power supply circuit 41 can turn on one LED 40, turn on two LEDs 40, or turn on all three LEDs 40 each time the switch 43 is operated. In the case where four LEDs 40 are provided, the power supply circuit 41 can turn on one LED 40, turn on two opposing LEDs 40, turn on three LEDs 40, or turn on all four LEDs 40 each time the switch 43 is operated.

[0037] 5(A), in the magnifying glass 1 according to the third embodiment, the objective lens 2 is basically flat, and has a small lens portion 20 with a diameter matching the light path hole 50 or the opening 32 at a position corresponding to the light path hole 50 or the light path tube portion 31. The objective lens 2 has an illumination lens portion 21 with a diameter matching the LED 40 at a position corresponding to the LED 40. Particularly in the magnifying glass according to this embodiment, the light collecting effect of the small lens portion 20 allows the distance between the optical axis and the LED to be larger than in the first and second embodiments.

[0038] As shown in Fig. 5(B), the magnifying glass 1 according to the third embodiment includes the focus ring 13 and the advance / retract mechanism 300, and has an imaging lens 34 on the objective end 12 side of the optical path tube portion 31, and an eyepiece lens 33 on the eyepiece end 13 side of the optical path tube portion 31. The objective lens 2 includes the small lens portion 20 and the illumination lens portion 21, and a lens hood portion 22 is provided around the small lens portion 20, extending from the end of the light-shielding tube portion 51 on the objective end 12 side to the objective end 12 of the lens barrel 10. The lens hood portion 22 is colored black for light shielding and can be flocked to have a shape that extends from the light-shielding tube portion 51.

[0039] When the focus ring 13 of the magnifying glass 1 is rotated around the optical axis 11 relative to the lens barrel 10 or moved forward or backward in the direction of the optical axis 11, the focus ring 13 moves in the optical axis 11 direction relative to the lens barrel 10 to correct aberration and obtain a clearer image. The lens hood portion 22 prevents diffuse reflection of light entering the optical path tube portion 31 from the small lens portion 20, obtaining a combination that makes it easier to observe. [Industrial Applicability]

[0040] The magnifying glass of the present invention can be used in monoculars, loupes, magnifying glasses, microscopes, telescopes, binoculars, endoscopes, cameras, camera lenses, surveillance cameras, lighting, flashlights, PC terminals, tablet terminals, smartphones, mobile phones, etc. [Explanation of symbols]

[0041] 1. Magnifying Glass 10. Same telescope tube 11 Same optical axis 12 Objective end 13 Eyepiece end (focus ring) 2 Objective lens (lens) 20 Small Lens Section 21 Lighting lens section 22 Lens hood section 3 Eyepiece 30 Eyepiece base end 31 Same optical path cylinder part 32 Same opening 33 Eyepiece lens (eyepiece optical system) 34 Imaging lens 300 Same forward and backward mechanism (helicoid mechanism, telescopic mechanism) 4 Lighting Unit 40 LED (lighting element) α The opening angle around the optical axis of the same LED arrangement β The inclination angle of the LED with respect to the optical axis 11 41 Same power supply circuit 42 Battery (power supply) 43 Same Switch 5 light holder 50 Same optical path hole 51 Same light-shielding cylinder part 52 Same light hole 6 Observation Objects 60 Observation hole 61 Defects such as burrs and scratches on the inner wall or bottom surface 7 Eyepoint

Claims

1. A lens barrel having an internal optical axis; a lens disposed on the optical axis at the objective end in the lens barrel; an opening eyepiece section provided at an eyepiece end in the lens barrel with an opening having the optical axis therein; an illumination unit disposed between the objective end and the eyepiece end in the lens barrel; Equipped with The lighting unit includes: a light-shielding tube disposed around the opening in the lens barrel; and an illumination element disposed between the light-shielding tube and the lens barrel for irradiating light toward an objective end side; having A magnifying glass characterized in that the distance between the center of the optical axis and the center of the lighting element is 25 mm or less.

2. The opening has an inner diameter of 15 mm; 2. The magnifying glass of claim 1, wherein the lighting elements are disposed within the aperture of the lens in the lens barrel and at equal angles around the light-shielding tube, and light emitted from the multiple lighting elements passes through and refracts the lens to illuminate an area along the extension of the optical axis.

3. The lighting unit includes: the lighting elements are tilted at an angle of 0 to 45 degrees towards the optical axis; The centers of the illumination lights intersect on an extension of the optical axis of the lens.

2. The magnifying glass of claim 1.

4. The lighting unit includes: The lighting element is an LED element, A power supply circuit for the lighting element, The power supply circuit includes a power supply unit that supplies power to each lighting element, and a switch that controls at least turning on and off the lighting elements.

2. The magnifying glass according to claim 1, comprising:

5. Further, the focus adjustment mechanism is provided. The focus adjustment mechanism includes: an optical path tube portion provided on the optical axis of the eyepiece portion and loosely inserted from the eyepiece end side of the light shielding tube so as to be freely advanced and retreated; an eyepiece lens disposed at an eyepiece end in the optical path tube portion; a reciprocating mechanism in the optical axis direction disposed between the lens barrel and the eyepiece; 2. The magnifying glass according to claim 1, comprising:

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