JP2006292794A - Lighting system of camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting system simplified by making an illumination light source common with the light source of a camera by enabling object illumination during macro photography, while concurrently having the role of a lens hood during normal photographing. <P>SOLUTION: A cylindrical member has a lens hood function that can be mounted in the tip end of a photographic lens. The lighting system having a ring-like light source embedding a plurality of white color emission diodes on the edge of the cylindrical member can receive power supply for lighting the white color emission diodes 8 from an incorporated battery 7 of the camera 6 by mounting on the photographic lens 3. In addition, the tip end of the photographic lens 3 has lens side contact terminals 15 and 16 of the battery 7 incorporated in the camera 6, and the lighting system includes hood side contact terminals 17 and 18 that becomes capable of being contacted on the lens side contact terminals 15 and 16 by being mounted on the tip end. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a camera illumination device, and more particularly to a camera illumination system that also serves as a lens hood that can be attached to the 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 less 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 Laid-Open No. 2003-91044 has a merit that a large amount of light can be obtained, but it is large 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. This is a macro illumination device that enables lighting for the time required for shooting with a light source, can illuminate a close-up subject in all directions, and can be easily mounted on a photographic lens with the smallest possible miniaturization. In addition, a simplified illumination system is provided by sharing the power supply of the apparatus with the power supply of the camera.

  In the illumination system for a camera of the present invention, an illumination having a cylindrical member having a lens hood function that can be attached to the distal end of a photographing lens and having a plurality of white light emitting diodes embedded in the distal end of the cylindrical member. The apparatus is characterized in that, when attached to the photographic lens, the power supply for lighting the white light emitting diode can be received from the built-in battery of the camera.

  The photographing lens has a battery power supply terminal built in the camera at the tip, and the lighting device has a contact terminal that can be brought into contact with the power supply terminal by being attached to the tip.

  The present invention provides a cylindrical member having a lens hood function that can be attached to the tip of a photographic lens, the illumination device having an annular light source in which a plurality of white light emitting diodes are embedded at the tip of the cylindrical member. It is possible to receive power supply for lighting the white light-emitting diode from the built-in battery of the camera by attaching to the camera, and a power supply terminal of the battery built in the camera is provided at the tip of the photographing lens. The illumination device is provided with a contact terminal that can be contacted with the power supply terminal by being attached to the tip, so that it can illuminate the subject during macro photography while also serving as a lens hood during normal photography. However, since the illumination power is supplied from the camera, there is no need to install a battery in the device of the present invention, and the entire camera system is lightweight. It is possible to efficiency good shot on that is.

  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 mounted on the front end of a photographing lens, and FIG. 2 is a schematic cross-sectional view and configuration showing a camera body and a connection circuit of the device of the present invention mounted on the photographing lens. It is a block diagram. FIG. 3 is a sketch showing the contact terminals of the device of the present invention and the photographing lens.

  In FIG. 2, the photographing lens 3 is composed of a plurality of lens barrels that support a plurality of lens groups including the objective lens 2 with the optical axis 1 as a center, and extends forward during zooming or focusing within these lens barrels. A lens hood can be attached to the front end of the lens barrel of the photographing lens 3 that needs to shield light rays other than the subject light by a screw type, a bayonet type, or a simple cover type.

  In the embodiment of the present invention, as shown in FIG. 3, the lens barrel tip of the taking lens 3 is formed with a tip groove 3e between the tip portion 3c and a raised edge 3d of the tip divided and formed on the circumference. The rear end of the lens hood is divided into a plurality of parts on the circumference at the same pitch, and the edge that protrudes inward (the raised edge 4a in FIG. 3) is fitted into the tip groove 3e of the photographing lens 3 and twisted to engage. An example of the bayonet method to be mounted is shown. In this way, the present proposal provides an illumination device and a system for mounting and using the same at the tip of the taking lens 3 with the same mounting mechanism as the conventional lens hood.

  As shown in FIG. 1 and FIG. 3, the cylindrical member 4 having a lens hood effect as a casing is used as the casing, and the cylindrical member 4 has a general lens hood shape, and the right rear end portion has a raised edge 4a inside. Can be attached by engaging the raised edge 4a and the raised edge 3d at the distal end of the photographing lens 3 by rightward twisting, and can be disengaged by twisting in the opposite direction. It is a mechanism that can be detached.

  On the other hand, as shown in FIGS. 2 and 3, the left end portion of the cylindrical member 4 is a wiring in which a plurality of white light emitting diodes 8 are annularly planted in the inner space 4c of the annular end opening 4b. A base 10 is inserted. As shown in FIG. 1, a plurality of white light emitting diodes 8 connected by the wiring board 10 are preferably embedded in an annular row in the annular tip opening 4 b of the cylindrical member 4.

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

  Further, in a single-lens reflex camera with interchangeable lenses, as shown in FIG. 2, a battery 7 for photographing operation is built in the camera 6 so that power can be supplied to the photographing lens 3 side. This is a system in which the photographic lens 3 can be attached to the camera 6 by coupling the mount 3a of the photographic lens 3 to the mount 6a on the camera 6 side, and the photographic lens 3 can be detached by releasing the coupling. Is attached, the camera-side contacts 11 and 12 come into contact with the lens-side contacts 13 and 14, and through this, power can be supplied from the battery 7 of the camera 6 to the lens CPU 19 mounted on the photographing lens 3. In addition, the AF operation and the aperture operation of the taking lens 3 can be performed from the driver 20.

  In addition to the lens side contacts 13 and 14, the photographic lens 3 to which the cylindrical member 4 can be attached has lens side contact terminals 15 and 16 installed in the tip groove 3 e of the photographic lens 3 as shown in FIG. 13 and 14 are connected. For this reason, the power of the battery 7 of the camera 6 can be taken out from the lens side contact terminals 15 and 16 of the leading end groove 3e of the photographing lens 3.

  Hood-side contact terminals 17 and 18 are installed inwardly on the raised edge 4a at the rear end of the cylindrical member 4, and the raised edge 4a is formed in the distal end groove 3e to attach the cylindrical member 4 to the distal end of the photographing lens 3. When the raised edge 4 a at the rear end of the cylindrical member 4 and the raised edge 3 d at the front end of the photographing lens 3 are engaged, the lens side contact terminal 15 of the front end groove 3 e of the photographing lens 3 is raised at the rear edge of the cylindrical member 4. The hood side contact terminal 17 of 4a and the lens side contact terminal 16 of the front end groove 3e of the photographing lens 3 are in contact with the hood side contact terminal 18 of the raised edge 4a at the rear end of the cylindrical member 4.

  Further, the cylindrical member 4 is equipped with hood side contact terminals 17 and 18, a white light emitting diode 8 including a wiring board 10, and a switch 5 for performing ON / OFF switching operation, and is connected by a circuit as shown in FIG. Has been.

  For this reason, if the photographic lens 3 is attached to the camera 6 and the cylindrical member 4 is attached to the tip of the photographic lens 3, power can be supplied from the built-in battery 7 of the camera 6 to the white light-emitting diode 8, and the switch 5 is turned on. , OFF operation can be easily performed. In particular, when used for illumination such as macro photography, there is a merit that a subject image illuminated with illumination light can be photographed while visually recognizing with a viewfinder. This illumination device can illuminate the part necessary for recording while blocking harmful rays on the subject on the optical axis 1, and is especially effective for macro photography with a photographic lens capable of macro photography. To do.

  The illumination device according to the present invention is a device in which an illumination function is added to a lens hood that is usually carried around, and the battery for illumination is shared with the battery 7 of the camera 6 so that the body can be made compact and lightweight. In the above description, the example in which the power supply circuit of the photographing lens 3 is directly connected to the lens side contact terminals 15 and 16 of the tip groove 3e of the photographing lens 3 has been described. It is possible to arrange a switch linked to the lever so that it is lit only during macro photography, or it is easy to measure the amount of light of the subject and automatically turn on the white light emitting diode.

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 the schematic sectional drawing and the structure block diagram showing the mode of the connection circuit of the apparatus of this invention with which the camera main body and its taking lens were mounted | worn. It is a sketch showing the contact terminal of this invention apparatus and a photographic lens.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical axis 2 Objective lens 3 Shooting lens 4 Cylindrical member 5 Switch 6 Camera 7 Battery 8 White light emitting diode 9 Light transmissive plate 10 Wiring board 11 Camera side contact 12 Camera side contact 13 Lens side contact 14 Lens side contact terminal 15 Lens side contact terminal 16 Lens side contact terminal 17 Hood side contact terminal 18 Hood side contact terminal 19 Lens CPU
20 drivers

Claims (2)

  A cylindrical member having a lens hood function that can be attached to the distal end of a photographic lens and having an annular light source in which a plurality of white light emitting diodes are embedded at the distal end of the cylindrical member, and attached to the photographic lens Thus, the camera illumination system can be supplied with electric power for lighting the white light emitting diode from the built-in battery of the camera.   The photographing lens has a power supply terminal for a battery built in the camera at the tip, and the lighting device has a contact terminal that can be brought into contact with the power supply terminal by being attached to the tip. The camera illumination system according to claim 1.

Images