JP2006292793A - Lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a close-up lighting system that can be mounted easily in a photographic lens by necessary minimum miniaturization by enabling lighting for the time necessary for photographing by a light source enhancing emission efficiency and enabling illumination, without irregularities, from omnidirections to a close-up object. <P>SOLUTION: In the accessory of a camera that can be mounted on the edge of the photographic lens, a cylindrical member 4 has a ring-like light source embedding a plurality of white color emission diodes 8 on the edge in the form of a ring, mounts a switch 5 for on-off operations for supplying current to the white color emission diodes 8, and has lens hood functions. In addition, the ring-like edge of the cylindrical member 4 is sealed with a ring-like optical beam transmissive plate 9 on the front of the buried white color emission diode 8. The optical beam transmissive plate 9 is molded into a Fresnel lens 9a, to uniformly irradiate the light source toward the object. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an illumination device for photographing a camera, and more particularly to an illumination device that also serves as a lens hood that can be attached to a lens tip.

  Recently, a white light-emitting diode having a wide wavelength in the visible region has been commercialized due to the invention of the blue light-emitting diode, and has been put into practical use in backlight illumination of liquid crystal displays, flashlights, and the like using this. This light-emitting diode is attracting attention as a light source that replaces incandescent bulbs because it has a smaller current and higher luminous efficiency than incandescent bulbs used in conventional lighting.

  In view of such a situation, a proposal for adapting to illumination of a subject at the time of camera photography has been found in Japanese Patent Laid-Open No. 2003-43567.

Conventionally, as a close-up light source, a parallax occurs with the light source attached to the camera, so it can be mounted in front of the close-up lens, and a ring strobe using an annular xenon tube has been commercialized. As disclosed in Japanese Patent Application Laid-Open No. 2003-91044, there is an illumination device dedicated as a close-up strobe.
JP 2003-43567 A JP 2003-91044 A

  However, the method proposed in Japanese Patent Application Laid-Open No. 2003-43567 requires a large amount of power for general photographing illumination, and tends to be large in size including the power supply. For general photographing illumination, it is common to use a strobe light emitting device capable of obtaining a conventional large light source.

  In addition, the illumination device disclosed in Japanese Patent Application Laid-Open No. 2003-91044 has an advantage that a large amount of light can be obtained, but it is large in size and cannot be easily photographed. In particular, strobe light is instantaneous pulse emission, and has a drawback that an illuminated subject image cannot be viewed in the viewfinder.

  In order to solve the above problems, the present invention proposed here is a simple illumination device for a macro photography lens as an accessory for a camera capable of close-up photography, particularly a single-lens reflex camera with interchangeable lenses, and has improved luminous efficiency. Provide lighting equipment for close-up photography that can be turned on for the time required for shooting with a light source, can illuminate subjects in close-up from all directions, and can be easily attached to a photographic lens with the smallest possible miniaturization. To do.

  The illumination device of the present invention is a cylindrical member having an annular light source formed by annularly embedding a plurality of white light emitting diodes at the distal end in an accessory of a camera that can be attached to the distal end of the photographing lens. A battery for supplying current to the white light emitting diode and a switch for on / off operation are mounted and have a lens hood function.

  Further, the annular tip of the cylindrical member is sealed with an annular light transmission plate on the front surface of the embedded white light emitting diode, and the transmission plate is formed into a Fresnel lens so as to irradiate the light source uniformly toward the subject. It is preferable that

  The present invention relates to a camera accessory that can be attached to the tip of a photographic lens, a cylindrical member having an annular light source formed by annularly embedding a plurality of white light emitting diodes at the tip, and the cylindrical member is the white light emitting diode. A battery for supplying electric current and a switch for on / off operation are mounted, and it has a lens hood function, and the annular tip of the cylindrical member transmits an annular light beam in front of the embedded white light emitting diode. Since the transmissive plate is formed into a Fresnel lens to irradiate the light source uniformly toward the subject, the illumination of the subject during close-up photography is also achieved while serving as a lens hood during normal photography. The illumination light without any unevenness can be obtained from the entire circumference with respect to the subject on the optical axis. Therefore, it is possible to take a picture while visually recognizing a clear subject image in the viewfinder.

  Hereinafter, the best embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of a state in which the device of the present invention is attached to the front end of a photographing lens, and FIG. 2 is a cross-sectional view of the state in which the device of the present invention is attached to the front end of a photographing lens. FIG. 3 is a circuit diagram of the device of the present invention.

  In FIG. 2, the photographic lens 3 is composed of a plurality of lens barrels 3a supporting a plurality of lens groups including the objective lens 2 with the optical axis 1 as the center, and the front of the lens barrel 3a during zooming or focusing. The lens hood can be attached to the lens barrel tip 3b of the photographing lens 3 that needs to be shielded against light rays other than the subject light by a screw type, a bayonet type, or a simple cover type. .

  As shown in FIGS. 1 and 2, the present invention is an apparatus having a cylindrical member 4 having a lens hood effect as a casing, and provides an illuminating apparatus that can be mounted on a lens barrel tip 3b of a photographing lens 3. is there.

  As shown in FIG. 2, the cylindrical member 4 has the shape of a general lens hood, and the right rear end 4a is detachably formed with respect to the lens barrel tip 3b of the photographing lens 3, while the left The front end of each has a shape in which a space 4c having an annular opening 4b is formed.

  An annular wiring board 10 is inserted into a space 4c formed by the annular opening 4b of the cylindrical member 4, and a plurality of white light emitting diodes 8 are annularly formed on the annular wiring board 10 as shown in FIG. A plurality of white light emitting diodes 8 are connected in parallel, and are preferably embedded in an annular row from the annular opening 4b of the cylindrical member 4 into the space 4c.

  Further, an annular light transmitting plate 9 is fitted into the annular opening 4b so as to cover the front surfaces of the plurality of white light emitting diodes 8 embedded in the space 4c of the cylindrical member 4, and the annular light transmitting plate is formed in the space 4c of the cylindrical member 4. 9 in a sealed state.

  The surface of the annular light transmitting plate 9 is formed into a Fresnel lens 9a, which is intended to prevent the object from becoming uneven irradiation light when the white light emitting diode 8 emits light. The object on the optical axis 1 is designed to be illuminated uniformly from the surroundings as indicated by the light beam p in FIG.

  1, in addition to a plurality of white light emitting diodes 8 embedded at the tip, a battery housing 6 for incorporating a battery 7 for lighting the cylindrical member 4 is fixed to the cylindrical member 4 of the device of the present invention. A switch 5 that can arbitrarily turn on or off the white light emitting diode 8 is provided.

  As a result, the battery 7, the white light emitting diode 8 and the switch 5 are wired inside the cylindrical member 4 with a conductive wire including an annular wiring board 10 for connecting according to the circuit diagram shown in FIG. 3. The annular light source composed of a plurality of white light emitting diodes 8 can be turned on or off by the current supplied from.

  The above-described apparatus of the present invention can illuminate the object on the optical axis 1 while blocking a harmful light beam such as the light beam q shown in FIG. 2 while illuminating light in the case of a single-lens reflex camera. There is an advantage that the subject hit can be photographed while visually checking with the viewfinder. In particular, a photographic lens capable of macro photography demonstrates its power in lighting during macro photography.

It is a perspective view of the state where the device of the present invention is attached to the front end of the taking lens. It is sectional drawing of the state which mounted | wore the imaging lens with this invention apparatus. It is a circuit diagram of the device of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical axis 2 Objective lens 3 Shooting lens 4 Cylindrical member 5 Switch 6 Battery housing 7 Battery 8 White light emitting diode 9 Light transmissive plate 10 Wiring board

Claims (2)

  In a camera accessory that can be attached to the tip of a photographing lens, a cylindrical member having an annular light source formed by annularly embedding a plurality of white light emitting diodes at the tip, the cylindrical member supplying current to the white light emitting diodes And a switch for on / off operation, and a lens hood function.   An annular tip of the cylindrical member is sealed with an annular light transmitting plate on the front surface of the white light emitting diode to be embedded, and the transmitting plate is formed into a Fresnel lens so as to uniformly irradiate the light source toward the subject. The lighting device according to claim 1, wherein the lighting device is one.

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