JP3705769B2 - Ring light for camera lighting - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ring light for camera illumination that is attached to the front surface of a camera body and is turned on during photographing to irradiate light on a subject.
[0002]
[Prior art]
A ring light attached to the lens barrel of the camera body includes a ring-shaped housing having a light-transmitting front window, an electrical light source attached in the housing, a power source for electrically exciting the electrical light source, and a power source. The switch is provided between the light source and the switch. When the switch is turned on, the electric light source is excited from the power source to turn on the light source and irradiate the subject.
[0003]
In the prior art ring light, the light source consists of one large fluorescent lamp, so the light source is large and a large battery of AA or more is used in the power supply unit, so the overall size of the ring light is large. Despite the large weight, there was a drawback that the amount of light was small. On the other hand, recently, digital cameras are often used for general medical care and dentistry, but in order to take close-up images of the subject, a power supply unit is used for close-up shooting of the subject by attaching a ring light to the front of the camera lens. If it was large and heavy, handling was inconvenient.
[0004]
[Problems to be solved by the invention]
The problem to be solved by the present invention is to provide a ring light for camera illumination that is easy to handle while being reduced in size and weight as a whole and that can obtain high illuminance with a large amount of light.
[0005]
[Means for Solving the Problems]
One solution of the present invention includes a ring-shaped housing having a light-transmissive front window, an electric light source mounted in the housing, a power source for electrically exciting the electric light source, a power source and a light source. A ring light for camera illumination comprising a switch provided between the plurality of LED lamp elements and an electrical connection means for electrically connecting the plurality of LED lamp elements in parallel. The plurality of LED lamp elements are attached to the ring-shaped substrate at intervals in the circumferential direction, the lead terminals penetrate the ring-shaped substrate, and the electrical connection means rings the lead terminals of the plurality of LED lamp elements. formed by soldering to each other in the rear surface of the Jo substrate, power supply, camera illumination, characterized in that it is housed in a battery case mounted to the housing And to provide a ring light.
[0006]
Another problem-solving means of the present invention includes a ring-shaped housing having a light-transmitting front window, an electric light source mounted in the housing, a power source for electrically exciting the electric light source, a power source and a light source. A ring light for camera illumination comprising a switch provided between the plurality of LED lamp elements and an electrical connection means for electrically connecting the plurality of LED lamp elements in parallel. The plurality of LED lamp elements are attached to the ring-shaped substrate at intervals in the circumferential direction thereof, the lead terminals penetrate the ring-shaped substrate, and the electrical connection means includes a printed circuit board which is a ring-shaped substrate. The lead wire terminals of the plurality of LED lamp elements are soldered onto the wiring pattern on the back surface of the printed circuit board, and the power supply is in a battery case attached to the housing. And to provide a camera illumination ring light, characterized in that it is housed.
[0007]
Thus, when the electric light source is composed of a plurality of LED lamp elements connected in parallel, the light source can be miniaturized, and a small and light dry battery such as AAA, AAA or CR2 can be used as a power source. When used, the entire ring light can be reduced in size and weight. Moreover, illumination with high illuminance can be obtained by a large number of LED lamp elements. Therefore, for example, when photographing a subject in a narrow position such as in the oral cavity of a patient, it is extremely convenient to illuminate the subject by attaching it to the front of the camera. It can be suitably used for subject photography.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described in detail with reference to the drawings. FIGS. 1 and 2 show a use state of a ring light 10 for camera illumination according to the present invention. The ring light 10 is, for example, a digital camera. The camera 12 is detachably attached to the lens tube 14 in front of the camera body 12A. In the illustrated embodiment, a magnifying lens 16 is further attached in front of the ring light 10, but this magnifying lens 16 may be attached between the lens tube 14 and the ring light 10. Will be described later.
[0009]
In the illustrated example, the attachment means 18 for attaching the ring lens 10 to the front of the lens tube 14 is sandwiched between the base tube 20 and the base tube 20 by screwing the ring light 10 into the base tube 20 as shown in FIG. The light adapter 22.
[0010]
In the illustrated example, the base tube 20 is attached via a step-up ring 26 that is screwed into a screw 14 t formed on the front inner peripheral surface of the lens tube 14. The step-up ring 26 has a small-diameter outer peripheral thread portion 26 t that is screwed into the screw 14 t of the lens cylinder 14 and a large-diameter inner peripheral thread portion 26 t ′ into which the base cylinder 20 of the attachment means 18 is to be screwed. Provided is a thread portion suitable for the outer thread portion 20t. Of course, if the outer peripheral thread portion 20t of the base tube 20 is compatible with the screw 14t of the lens tube 14, the step-up ring 26 is not necessary. Although not shown, when the screw 14t of the lens tube 14 is larger than the outer peripheral screw portion 20t of the base tube 20, a step down ring that fits the outer peripheral screw portion 20t of the base tube 20 is used.
[0011]
The base tube 20 engages with the back surface of the ring light 10, and the light adapter 22 engages with the front surface of the ring light 10 to penetrate the ring light 10 and screw the screw portion 22 t screwed into the inner peripheral screw portion 20 t ′ of the base tube 20. Have. In the illustrated example, the light adapter 22 has a curved magnifying cylindrical portion 24 that fits the inner peripheral surface of the ring light 10 in the front, and the magnifying lens 16 is attached to an inner peripheral screw portion 24 t of the curved magnifying cylindrical tube 24. However, depending on how the camera is used, the magnifying lens 16 may be removed, and a filter may be attached via a filter ring as necessary. Further, in the example shown in the figure, the transparent cover 23 is fitted to the cylindrical portion 22 c between the outer peripheral threaded portion 22 t of the light adapter 22 and the curved enlarged cylindrical portion 24, and the transparent cover 23 is based on the ring light 10. Although the tube 20 and the light adapter 22 are positioned in the correct posture, this transparent cover may be omitted if only the light adapter 22 is positioned in the correct posture.
[0012]
As shown in FIGS. 2 to 5, the ring light 10 includes a ring-shaped housing 30 having a light-transmitting front window, an electric light source 32 mounted in the housing 30, and the electric light source 32 electrically. The power source 34 to be excited includes a switch 36 provided between the power source 34 and the light source 32.
[0013]
As shown in FIGS. 3 to 5, the electrical light source 32 includes a plurality of LED lamp elements 38 and an electrical connection means 40 that electrically connects the plurality of LED lamp elements 38 in parallel. As shown in FIGS. 2 and 3, 32 is housed in a battery case 60 formed integrally with the housing 30.
[0014]
As shown in FIG. 6, the plurality of LED lamp elements 38 are attached to the ring-shaped substrate 42 at intervals in the circumferential direction, and the electrical connection means 40 includes terminals 38 a of the plurality of LED lamp elements 38. Are connected on the ring-shaped substrate 42. Ring-shaped substrate 42 is fixed to the housing 30 by suitable means are arranged in the housing 3 in the 0.
[0015]
In the form of FIG. 6, the plurality of LED lamp elements 38 pass through their lead terminals 38a through the ring-shaped substrate 42 and are folded back on the back side, and the electrical connection means 40 includes a plurality of LED lamps as shown in FIG. In order to connect the elements 38 in parallel with each other, the connection lines 44, 44 'and the positive and negative lead terminals 38a are soldered to each other on the back surface of the ring-shaped substrate 42 as indicated by reference numeral 46. Yes.
[0016]
As shown in FIGS. 3 and 5, the connection lines 44 and 44 ′ are connected to the power supply 32 through the switch 36. The power source 32 is composed of a small and lightweight dry battery 32A such as single 5 type, single 4 type or CR2, and in the illustrated form, a plurality of dry cells are connected in series. The switch 36 is preferably a push button type switch that repeatedly turns on and off by repeatedly pressing. The switch 36 is integrated into the battery case 60 so that the push button 36a is exposed. The connection lines 44, 44 ′ and the switch 36 can be connected at the neck portion 42AN of the ring-shaped substrate 42 (see FIG. 6).
[0017]
If the electric light source 32 is composed of a plurality of LED lamp elements 38 connected in parallel to each other, the light source 32 can be miniaturized, and in combination with the use of small and light dry batteries such as single, four, and CR2. As a result, the entire ring light 10 can be reduced in size and weight.
[0018]
Further, the LED lamp element 38 can be electrically connected and mechanically fixed simply by penetrating the lead terminal 38a into the ring-shaped substrate 42 and soldering on the back surface of the substrate 42. Can be done.
[0019]
A variation of the electrical connection means 40 is shown in FIG. In the form of FIG. 7, the ring-shaped substrate 42 is composed of a printed wiring board 42A, and the lead terminal 38a of the LED lamp element 38 penetrates through the through hole of the printed wiring board 42A and forms a predetermined pattern conductive layer 42AD on the back surface. Soldered connection. In this case, the connection line connected to the conductive layer 42AD can be connected to the power supply 32 via the switch 36.
[0020]
【Example】
One embodiment of the present invention will be described below. A ring-shaped substrate 42 disposed in the housing 30 is formed in the form of FIG. 6 and has an outer diameter of 70 mm, an inner diameter of 58 mm, a thickness of 2 mm, and a ring width. Was 6 mm. Thirty-two LED lamp elements 38 are mounted on the ring-shaped substrate 42, and the connection wires 44 and 44 ′ are introduced into the battery case 60 and connected to the battery contact terminals in the battery case 60 via the push button switch 36. did. The height of the main body portion of each LED lamp element 38 was 9 mm. The ring light housing 30 has an outer diameter of 90 mm, an inner diameter of 58 mm, a thickness of 20 mm, and a height including the neck of 220 mm. The battery case 60 integrated with the housing 30 has a height in the case of AAA batteries. It had dimensions of 25 mm, width 30 mm, and depth 55 mm. The total weight of the ring light including the weight of the battery case was 94 g, and the total weight including the battery was 139 g. When the ring light 10 was turned on using four AAA alkaline batteries as a power source (6 V), illumination of 640 to 1200 lux was obtained.
[0021]
In the above example, when the CR2 battery was used as a power source, the dimensions of the battery case were 32 mm in height, 35 mm in width, and 20 mm in depth, and the weight was almost the same as in the case of AAA batteries.
[0022]
A conventional fluorescent ring light, for example, a macro ring light sold under the trade name UN, has an outer diameter of 89 mm, an inner diameter of 38 mm, a thickness of 35 mm, and a height of 226 mm including the neck, but a height of 65 mm. A battery case with a width of 110 mm and a depth of 35 mm is required, the weight of the ring light is 90 g, the weight of the battery case is 105 g, the total weight including the battery is 515 g, and a maximum of 400 using eight AA alkaline batteries. Looks, at least 320 lux lighting could be obtained.
[0023]
When this is compared with the ring light of the present embodiment, the ring light of the present embodiment is 3/5 in thickness, 1/4 in total weight, and total volume in the housing and battery case compared to the conventional fluorescent ring light. It can be seen that a light quantity of 2-3 times can be obtained with 1/3.
[0024]
【The invention's effect】
According to the present invention, as described above, when the electric light source is composed of a plurality of LED lamp elements connected in parallel, the light source can be reduced in size, and a small and light dry battery such as AAA or CR2 can be used. Combined with use, the entire ring light can be reduced in size and weight, and a large amount of light can be obtained. Therefore, for example, when photographing a subject in a narrow position such as in the oral cavity of a patient, it is extremely convenient to illuminate the subject by attaching it to the front of the camera. It can be suitably used for subject photography.
[0025]
In particular, when an LED lamp element is attached to a printed wiring board, which is a ring-shaped substrate, and electrically connected, the light source is further flattened and further reduced in size and weight compared to the case where it is electrically connected via a connection line. More preferable.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a state in which a ring light according to one embodiment of the present invention is attached to a camera.
FIG. 2 is a longitudinal sectional view of the same state as FIG. 1, but in an exploded state thereof.
FIG. 3 is a front view of the ring light of the present invention.
FIG. 4 is an enlarged cross-sectional view of a main part of the ring light of the present invention.
FIG. 5 is an electric circuit diagram of the ring light of the present invention.
6A and 6B show a ring-shaped substrate to which a plurality of LED lamp elements used in the present invention are attached. FIG. 6A is a front view thereof, FIG. 6B is a rear view thereof, and FIG. ) Is a partial cross-sectional view thereof.
FIG. 7 is a cross-sectional view of a modified example of the present invention in which an LED lamp element is mounted.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Ringlight 12 Digital camera 12A Camera main body 14 Lens tube 14t Inner peripheral thread part 16 Magnifying lens 18 Attaching means 20 Base cylinder 20t Outer peripheral thread part 22 Light adapter 22t Screw part 22c Tube part 23 Transparent cover 24 Curve expansion cylindrical part 24t Inner peripheral screw Part 26 step-up ring 26t small-diameter outer peripheral thread part 26t 'inner peripheral thread part 30 ring-shaped housing 32 electrical light source 34 power source 34A dry battery 36 switch 36a push button 38 LED lamp element 38a terminal 40 electrical connection means 42 ring-shaped substrate 42A printing Wiring board 42AD Conductive layer 42AN Neck portion 44, 44 'Connection line 46 Soldering portion 60 Battery case

Claims (2)

 A ring-shaped housing having a light-transmitting front window; an electrical light source mounted in the housing; a power source for electrically exciting the electrical light source; and a switch provided between the power source and the light source. In the camera illumination ring light, the electrical light source includes a plurality of LED lamp elements and an electrical connection means for electrically connecting the plurality of LED lamp elements in parallel, and the plurality of LED lamp elements includes a ring. The lead terminals are attached to the ring-shaped substrate at intervals in the circumferential direction thereof, and the lead terminals penetrate the ring-shaped substrate. The power source is housed in a battery case attached to the housing. Use ring light. A ring-shaped housing having a light-transmitting front window; an electric light source mounted in the housing; a power source for electrically exciting the electric light source; and a switch provided between the power source and the light source. In the camera illumination ring light, the electrical light source includes a plurality of LED lamp elements and an electrical connection means for electrically connecting the plurality of LED lamp elements in parallel, and the plurality of LED lamp elements includes a ring. A plurality of LEDs connected to the ring-shaped substrate at intervals in the circumferential direction thereof, the lead terminals passing through the ring-shaped substrate, and the electrical connection means including a printed circuit board which is the ring-shaped substrate. The lead terminal of the lamp element is soldered onto a wiring pattern on the back surface of the printed circuit board, and the power source is attached to the housing. Camera illumination ring light, characterized in that accommodated in the pond case.

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