JP4464164B2 - Lighting device for photography - Google Patents

Description

  The present invention relates to an illumination device for close-up photography, and more particularly to a dental illumination device for photographing close-ups of a human dentition.

Generally, when taking a close-up photograph of a human dentition for dentistry, a ring strobe suitable for close-up photography may be used. (For example, patent document 1). The ring strobe is attached to the outer periphery of the lens barrel of the imaging apparatus and irradiates light to the patient's mouth.
JP 2001-356403 A (FIG. 1)

  When a ring strobe is used in photographing a patient's dentition, the entire face is illuminated, and the patient may feel uncomfortable due to glare of illumination light, heat, or the like. When the light emission surface of the ring strobe is large, there may be an intimidating feeling to the patient in close-up photography.

  In general, a ring strobe may illuminate a range that is not related to photographing, so that it cannot be efficiently illuminated, leading to wasteful power consumption.

  In close-up photography for dentistry, the present invention is necessary for photographing such as an illumination device that irradiates illumination light only to the patient's mouth and performs efficient illumination while preventing discomfort to the patient. It aims at providing the illuminating device which illuminates only the range efficiently.

  The illumination device of the present invention is detachably attached to the outer periphery of the lens barrel and is used for close-up photography. The illumination device includes a light source that emits illumination light from the lens barrel side toward the subject side, and a cylindrical shape that has a diameter from the light source toward the distal end on the subject side in the central axis direction of the lens barrel. It has a tapered shape with smaller directional dimensions, and is arranged so as to cover the outer peripheral surface of the light guide member that guides incident illumination light toward the subject side, and reflects the illumination light transmitted through the light guide member A reflective member.

  The tip of the light guide member on the subject side preferably has a flange portion that protrudes more than the reflecting member in the central axis direction of the lens barrel. The light guide member is preferably made of a diffusive material that diffuses illumination light incident from the light source.

  The inner peripheral surface of the light guide member is preferably substantially parallel to the central axis of the lens barrel. In addition, it is desirable that the inner diameter of the tip of the illumination device on the subject side is substantially equal to the inner diameter of the lens barrel.

  The light source is preferably located near the end on the lens barrel side. The light source is a semiconductor light emitting element, for example.

  The light guide member that guides light while diffusing illumination light from the light source toward the subject side has a tapered shape that tapers toward the subject side, thereby preventing significant diffusion of illumination light emitted toward the subject side, An illumination device that efficiently illuminates only a range necessary for photographing can be realized.

  ADVANTAGE OF THE INVENTION According to this invention, in close-up photography, the illuminating device which enables efficient illumination can be provided, irradiating only a patient's mouth and irradiating illumination light and giving a patient discomfort.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a lighting device and a digital camera.

  The illumination device 10 according to the present embodiment is detachably attached to the distal end of the outer periphery of a lens barrel 32 that includes a photographing optical system (not shown) of the digital camera 30 and is used. The lens barrel 32 has substantially the same diameter as an interchangeable lens for a single-lens reflex camera. The illuminating device 10 is cylindrical and has a tapered shape that becomes narrower toward the subject. An LED (semiconductor light emitting element, not shown here) is used as a light source of the illumination device 10, and the light source includes a power supply unit 40 electrically connected to the illumination device 10 via a connection cord 42. Power is supplied.

  FIG. 2 is a perspective view showing the lighting device 10 and the power supply unit 40.

  The illumination device 10 is detachably attached to the lens barrel 32 via the attachment portion 12. The power supply unit 40 is attached to the digital camera 30 via a screw 44 that is screwed into a tripod attachment hole (not shown) provided in the digital camera 30. The user attaches and detaches the power supply unit 40 by operating a dial 46 interlocked with the screw 44.

  FIG. 3 is a cross-sectional view of the illumination device 10 attached to the lens barrel 32.

  The illumination device 10 includes an LED and includes a light source unit 14 that emits illumination light, a light guide member 16, and a reflection member 18. The light source unit 14 emits illumination light from the lens barrel 32 toward the subject and does not obstruct the optical path of the illumination light, that is, near the end of the illumination device 10 on the lens barrel 32 side, that is, the attachment unit 12. It is arranged in the vicinity of The light guide member 16 has a cylindrical shape and is formed in a tapered shape that becomes narrower from the light source unit 14 side toward the subject side in the central axis direction of the lens barrel 32. The light guide member 16 is in contact with the light source unit 14 and is formed of a diffusible material that diffuses illumination light. Therefore, the illumination light emitted from the light source unit 14 is guided toward the subject side. The reflection member 18 is formed in a cylindrical shape and a tapered shape coaxially with the light guide member 16 so as to cover the outer peripheral surface of the light guide member 16, and reflects the illumination light transmitted through the light guide member 16.

  An arrow in the light guide member 16 illustrates an optical path of illumination light in the light guide member 16. The illumination light emitted from the light source unit 14 is guided by being diffused through the transmissive light guide member 16 by being reflected on the surface of the reflection member 18 except for a part thereof. As a result, the illumination light reflected by the reflecting member 18 is emitted from the inner peripheral surface 24 of the light guide member 16 in a direction toward the central axis E of the lens barrel of the digital camera 30 (see arrow A). Note that the arrow A exemplifies the emission direction of the illumination light, and the illumination light from the inner peripheral surface 24 is actually emitted at various angles so as to travel toward the subject while facing the optical axis E. Is done. Further, the central axis E coincides with the optical axis of the photographing optical system 34.

  The light guide member 16 has a flange portion 20 at the distal end portion on the subject side. The flange portion 20 protrudes from the subject-side end of the reflecting member 18 in the direction of the central axis E of the lens barrel. An irradiation surface 22 perpendicular to the central axis E is provided at the tip of the flange portion 20. And from the irradiation surface 22, the illumination light which is not reflected in the surface of the reflection member 18 among the illumination lights from the light source part 14 is mainly inject | emitted. For this reason, part of the illumination light emitted from the irradiation surface 22 travels along a direction parallel to the central axis E. Further, since the illumination light is diffused by the light guide member 16, a part of the illumination light from the irradiation surface 22 is in a direction having an irradiation angle α with respect to the central axis E so as to be away from the central axis E. (See arrow B). Arrow B also exemplifies the direction of emission of irradiation light. The flange portion 20 has not only the irradiation surface 22 but also an outer peripheral surface 23 that forms the front end portion of the outer surface of the illumination device 10, and the boundary between the illumination area and the non-illumination area that is reflected when shooting a little apart. In order to make it inconspicuous, illumination light is also slightly emitted from the outer peripheral surface 23.

  Further, since the light guide member 16 emits part of the illumination light that is not reflected by the reflecting member 18 in a direction substantially parallel to the central axis E from the irradiation surface 22, the light source 14 is close to the inner peripheral surface 24. Are arranged as follows.

  Further, the inner peripheral surface 24 is parallel to the central axis E, and the inner diameter at the subject-side tip of the illumination device 10 is substantially equal to the inner diameter of the lens barrel 32. Furthermore, since the light guide member 16 and the reflection member 18 are tapered so as to become narrower toward the subject side, the illumination light irradiated from the irradiation surface 22 is not irradiated over a wide range, and the central axis E The irradiation angle α with respect to is suppressed to a small angle. As described above, illumination light is irradiated from the irradiation surface 22 and the inner peripheral surface 24, and thus the illumination device 10 as a whole extends the contour of the outer periphery of the irradiation surface 22 to the subject side in parallel to the central axis E. In this case, a range obtained by slightly extending a substantially circular area formed on the subject by the extended contour is illuminated almost uniformly in close-up.

  FIG. 4 is a perspective view showing the light source unit 14 and the light guide member 16. In addition, although the light source part 14 and the light guide member 16 are actually in contact with each other, FIG. 4 shows a state in which they are separated in order to clearly show their shapes. FIG. 5 is a top view showing the light source unit 14.

  Although the light source unit 14 and the light guide member 16 and the light guide member 16 and the reflection member 18 are actually in contact with each other, FIG. 4 clearly shows the shapes of the light source unit 14 and the light guide member 16. For this reason, the light source unit 14 and the light guide member 16 are separated from each other except for the reflection member 18.

  The light source unit 14 includes first to eighth LEDs 15 </ b> A to 15 </ b> H and an annular mounting substrate 17. The first to eighth LEDs 15A to 15H are mounted on the mounting substrate 17 at equal intervals. On the other hand, the tapered light guide member 16 has a light source mounting surface 26 at the end including the mounting portion 12 (see FIG. 3). The first to eighth LEDs 15 </ b> A to 15 </ b> H are fixed by the mounting substrate 17.

  The first to eighth LEDs 15A to 15H each emit the same amount of illumination light. The illumination light from any LED is guided while being diffused by the light guide member 16. Due to the diffusion by the light guide member 16, the amount of illumination light emitted toward the subject is substantially uniform on the irradiation surface 22, and also the inner peripheral surface 24 has a circular shape with the same distance from the mounting surface 26. The amount of light in the region is almost uniform.

  The first to eighth LEDs 15 </ b> A to 15 </ b> H are electrically connected by a first wire 27 and a second wire 28 arranged along the mounting substrate 17. The first wire 27 is for the anode, and the second wire 28 is for the cathode. The first to eighth LEDs 15A to 15H are supplied with power from the power supply unit 40 via the first and second wires 27 and 28 and the connection cord 42.

  FIG. 6 is a side view showing the lighting device 10 used with the digital camera 30.

  As described above, the illuminating device 10 extends the outer peripheral contour of the irradiation surface 22 in a direction parallel to the central axis E so that the range formed slightly on the subject is substantially equal in close-up photography. To illuminate. In the present embodiment, since the shape of the light guide member 16 is adjusted so as to be suitable for close-up of the dentition, the illuminating device 10 does not irradiate the patient's eyes with illumination light during close-up. Only the illumination area 48 below the containing nose is illuminated.

  In this way, since only a necessary range is illuminated and an LED with higher luminous efficiency is used as the light source, the illumination device 10 enables efficient illumination with reduced power consumption.

  As described above, according to the present embodiment, in close-up photography, an illumination device that enables efficient illumination while preventing the patient from feeling uncomfortable by illuminating only the patient's mouth is provided. The purpose is to do.

  The light source unit 14 preferably includes an LED that has high luminous efficiency and can continuously emit illumination light, but is not limited thereto. For example, illumination light may be emitted using a xenon lamp. Further, the number and arrangement of the LEDs are not limited to the present embodiment, and for example, a single LED having an annular light emitting surface may be used.

  The power supply unit 40 may supply power while being in contact with the lighting device 10 without using the connection cord 42. In this case, the power supply unit 40 is installed, for example, in the vicinity of the light source unit 14 so as to cover the lens barrel 32.

It is a perspective view which shows an illuminating device and a digital camera. It is a perspective view which shows an illuminating device and a power supply unit. It is sectional drawing of the illuminating device in the state attached to the lens-barrel. It is a perspective view which shows the light source part and light guide member in the isolate | separated state. It is a top view which shows a light source part. It is a side view which shows the illuminating device used with a digital camera.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Illuminating device 12 Mounting part 14 Light source part (light source)
15A-15H 1st-8th LED (semiconductor light emitting element)
16 Light guide member 18 Reflecting member 20 Flange part 22 Irradiation surface 24 Inner peripheral surface 30 Digital camera (imaging device)
32 Lens barrel 34 Imaging optical system

Claims (7)

An illumination device for close-up that is detachably attached to the outer periphery of a lens barrel,
A light source that emits illumination light from the lens barrel side toward the subject side;
It is cylindrical and has a tapered shape in which the radial dimension decreases from the light source toward the tip on the subject side in the central axis direction of the lens barrel, and guides the incident illumination light toward the subject side. An optical member;
A reflective member that is disposed so as to cover an outer peripheral surface of the light guide member and reflects the illumination light transmitted through the light guide member ;
A lighting device , wherein a tip portion of the light guide member on the subject side has a flange portion protruding from the reflecting member in a central axis direction of the lens barrel . At the tip of the flange portion, perpendicular distal irradiated surface with respect to the central axis of the lens barrel, the lighting device according to claim 1, characterized that you have is provided and the outer peripheral irradiation surface of the outer surface side.   The illumination device according to claim 1, wherein the light guide member is made of a diffusive material that diffuses illumination light incident from the light source.   The lighting device according to claim 1, wherein an inner peripheral surface of the light guide member is substantially parallel to a central axis of the lens barrel.   The illumination device according to claim 1, wherein an inner diameter of a distal end portion on the subject side of the illumination device is substantially equal to an inner diameter of the lens barrel.   The lighting device according to claim 1, wherein the light source is positioned in the vicinity of an end portion on the lens barrel side. The lighting device according to claim 1, wherein the light source is a semiconductor light emitting element.

Images